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1/*
2 * Copyright (C) ST-Ericsson AB 2012
3 *
4 * Main and Back-up battery management driver.
5 *
6 * Note: Backup battery management is required in case of Li-Ion battery and not
7 * for capacitive battery. HREF boards have capacitive battery and hence backup
8 * battery management is not used and the supported code is available in this
9 * driver.
10 *
11 * License Terms: GNU General Public License v2
12 * Author:
13 * Johan Palsson <johan.palsson@stericsson.com>
14 * Karl Komierowski <karl.komierowski@stericsson.com>
15 * Arun R Murthy <arun.murthy@stericsson.com>
16 */
17
18#include <linux/init.h>
19#include <linux/module.h>
20#include <linux/device.h>
21#include <linux/interrupt.h>
22#include <linux/platform_device.h>
23#include <linux/power_supply.h>
24#include <linux/kobject.h>
25#include <linux/slab.h>
26#include <linux/delay.h>
27#include <linux/time.h>
28#include <linux/of.h>
29#include <linux/completion.h>
30#include <linux/mfd/core.h>
31#include <linux/mfd/abx500.h>
32#include <linux/mfd/abx500/ab8500.h>
33#include <linux/mfd/abx500/ab8500-bm.h>
34#include <linux/mfd/abx500/ab8500-gpadc.h>
35#include <linux/kernel.h>
36
37#define MILLI_TO_MICRO 1000
38#define FG_LSB_IN_MA 1627
39#define QLSB_NANO_AMP_HOURS_X10 1071
40#define INS_CURR_TIMEOUT (3 * HZ)
41
42#define SEC_TO_SAMPLE(S) (S * 4)
43
44#define NBR_AVG_SAMPLES 20
45
46#define LOW_BAT_CHECK_INTERVAL (HZ / 16) /* 62.5 ms */
47
48#define VALID_CAPACITY_SEC (45 * 60) /* 45 minutes */
49#define BATT_OK_MIN 2360 /* mV */
50#define BATT_OK_INCREMENT 50 /* mV */
51#define BATT_OK_MAX_NR_INCREMENTS 0xE
52
53/* FG constants */
54#define BATT_OVV 0x01
55
56#define interpolate(x, x1, y1, x2, y2) \
57 ((y1) + ((((y2) - (y1)) * ((x) - (x1))) / ((x2) - (x1))));
58
59#define to_ab8500_fg_device_info(x) container_of((x), \
60 struct ab8500_fg, fg_psy);
61
62/**
63 * struct ab8500_fg_interrupts - ab8500 fg interupts
64 * @name: name of the interrupt
65 * @isr function pointer to the isr
66 */
67struct ab8500_fg_interrupts {
68 char *name;
69 irqreturn_t (*isr)(int irq, void *data);
70};
71
72enum ab8500_fg_discharge_state {
73 AB8500_FG_DISCHARGE_INIT,
74 AB8500_FG_DISCHARGE_INITMEASURING,
75 AB8500_FG_DISCHARGE_INIT_RECOVERY,
76 AB8500_FG_DISCHARGE_RECOVERY,
77 AB8500_FG_DISCHARGE_READOUT_INIT,
78 AB8500_FG_DISCHARGE_READOUT,
79 AB8500_FG_DISCHARGE_WAKEUP,
80};
81
82static char *discharge_state[] = {
83 "DISCHARGE_INIT",
84 "DISCHARGE_INITMEASURING",
85 "DISCHARGE_INIT_RECOVERY",
86 "DISCHARGE_RECOVERY",
87 "DISCHARGE_READOUT_INIT",
88 "DISCHARGE_READOUT",
89 "DISCHARGE_WAKEUP",
90};
91
92enum ab8500_fg_charge_state {
93 AB8500_FG_CHARGE_INIT,
94 AB8500_FG_CHARGE_READOUT,
95};
96
97static char *charge_state[] = {
98 "CHARGE_INIT",
99 "CHARGE_READOUT",
100};
101
102enum ab8500_fg_calibration_state {
103 AB8500_FG_CALIB_INIT,
104 AB8500_FG_CALIB_WAIT,
105 AB8500_FG_CALIB_END,
106};
107
108struct ab8500_fg_avg_cap {
109 int avg;
110 int samples[NBR_AVG_SAMPLES];
111 __kernel_time_t time_stamps[NBR_AVG_SAMPLES];
112 int pos;
113 int nbr_samples;
114 int sum;
115};
116
117struct ab8500_fg_cap_scaling {
118 bool enable;
119 int cap_to_scale[2];
120 int disable_cap_level;
121 int scaled_cap;
122};
123
124struct ab8500_fg_battery_capacity {
125 int max_mah_design;
126 int max_mah;
127 int mah;
128 int permille;
129 int level;
130 int prev_mah;
131 int prev_percent;
132 int prev_level;
133 int user_mah;
134 struct ab8500_fg_cap_scaling cap_scale;
135};
136
137struct ab8500_fg_flags {
138 bool fg_enabled;
139 bool conv_done;
140 bool charging;
141 bool fully_charged;
142 bool force_full;
143 bool low_bat_delay;
144 bool low_bat;
145 bool bat_ovv;
146 bool batt_unknown;
147 bool calibrate;
148 bool user_cap;
149 bool batt_id_received;
150};
151
152struct inst_curr_result_list {
153 struct list_head list;
154 int *result;
155};
156
157/**
158 * struct ab8500_fg - ab8500 FG device information
159 * @dev: Pointer to the structure device
160 * @node: a list of AB8500 FGs, hence prepared for reentrance
161 * @irq holds the CCEOC interrupt number
162 * @vbat: Battery voltage in mV
163 * @vbat_nom: Nominal battery voltage in mV
164 * @inst_curr: Instantenous battery current in mA
165 * @avg_curr: Average battery current in mA
166 * @bat_temp battery temperature
167 * @fg_samples: Number of samples used in the FG accumulation
168 * @accu_charge: Accumulated charge from the last conversion
169 * @recovery_cnt: Counter for recovery mode
170 * @high_curr_cnt: Counter for high current mode
171 * @init_cnt: Counter for init mode
172 * @low_bat_cnt Counter for number of consecutive low battery measures
173 * @nbr_cceoc_irq_cnt Counter for number of CCEOC irqs received since enabled
174 * @recovery_needed: Indicate if recovery is needed
175 * @high_curr_mode: Indicate if we're in high current mode
176 * @init_capacity: Indicate if initial capacity measuring should be done
177 * @turn_off_fg: True if fg was off before current measurement
178 * @calib_state State during offset calibration
179 * @discharge_state: Current discharge state
180 * @charge_state: Current charge state
181 * @ab8500_fg_started Completion struct used for the instant current start
182 * @ab8500_fg_complete Completion struct used for the instant current reading
183 * @flags: Structure for information about events triggered
184 * @bat_cap: Structure for battery capacity specific parameters
185 * @avg_cap: Average capacity filter
186 * @parent: Pointer to the struct ab8500
187 * @gpadc: Pointer to the struct gpadc
188 * @bm: Platform specific battery management information
189 * @fg_psy: Structure that holds the FG specific battery properties
190 * @fg_wq: Work queue for running the FG algorithm
191 * @fg_periodic_work: Work to run the FG algorithm periodically
192 * @fg_low_bat_work: Work to check low bat condition
193 * @fg_reinit_work Work used to reset and reinitialise the FG algorithm
194 * @fg_work: Work to run the FG algorithm instantly
195 * @fg_acc_cur_work: Work to read the FG accumulator
196 * @fg_check_hw_failure_work: Work for checking HW state
197 * @cc_lock: Mutex for locking the CC
198 * @fg_kobject: Structure of type kobject
199 */
200struct ab8500_fg {
201 struct device *dev;
202 struct list_head node;
203 int irq;
204 int vbat;
205 int vbat_nom;
206 int inst_curr;
207 int avg_curr;
208 int bat_temp;
209 int fg_samples;
210 int accu_charge;
211 int recovery_cnt;
212 int high_curr_cnt;
213 int init_cnt;
214 int low_bat_cnt;
215 int nbr_cceoc_irq_cnt;
216 bool recovery_needed;
217 bool high_curr_mode;
218 bool init_capacity;
219 bool turn_off_fg;
220 enum ab8500_fg_calibration_state calib_state;
221 enum ab8500_fg_discharge_state discharge_state;
222 enum ab8500_fg_charge_state charge_state;
223 struct completion ab8500_fg_started;
224 struct completion ab8500_fg_complete;
225 struct ab8500_fg_flags flags;
226 struct ab8500_fg_battery_capacity bat_cap;
227 struct ab8500_fg_avg_cap avg_cap;
228 struct ab8500 *parent;
229 struct ab8500_gpadc *gpadc;
230 struct abx500_bm_data *bm;
231 struct power_supply fg_psy;
232 struct workqueue_struct *fg_wq;
233 struct delayed_work fg_periodic_work;
234 struct delayed_work fg_low_bat_work;
235 struct delayed_work fg_reinit_work;
236 struct work_struct fg_work;
237 struct work_struct fg_acc_cur_work;
238 struct delayed_work fg_check_hw_failure_work;
239 struct mutex cc_lock;
240 struct kobject fg_kobject;
241};
242static LIST_HEAD(ab8500_fg_list);
243
244/**
245 * ab8500_fg_get() - returns a reference to the primary AB8500 fuel gauge
246 * (i.e. the first fuel gauge in the instance list)
247 */
248struct ab8500_fg *ab8500_fg_get(void)
249{
250 struct ab8500_fg *fg;
251
252 if (list_empty(&ab8500_fg_list))
253 return NULL;
254
255 fg = list_first_entry(&ab8500_fg_list, struct ab8500_fg, node);
256 return fg;
257}
258
259/* Main battery properties */
260static enum power_supply_property ab8500_fg_props[] = {
261 POWER_SUPPLY_PROP_VOLTAGE_NOW,
262 POWER_SUPPLY_PROP_CURRENT_NOW,
263 POWER_SUPPLY_PROP_CURRENT_AVG,
264 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
265 POWER_SUPPLY_PROP_ENERGY_FULL,
266 POWER_SUPPLY_PROP_ENERGY_NOW,
267 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
268 POWER_SUPPLY_PROP_CHARGE_FULL,
269 POWER_SUPPLY_PROP_CHARGE_NOW,
270 POWER_SUPPLY_PROP_CAPACITY,
271 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
272};
273
274/*
275 * This array maps the raw hex value to lowbat voltage used by the AB8500
276 * Values taken from the UM0836
277 */
278static int ab8500_fg_lowbat_voltage_map[] = {
279 2300 ,
280 2325 ,
281 2350 ,
282 2375 ,
283 2400 ,
284 2425 ,
285 2450 ,
286 2475 ,
287 2500 ,
288 2525 ,
289 2550 ,
290 2575 ,
291 2600 ,
292 2625 ,
293 2650 ,
294 2675 ,
295 2700 ,
296 2725 ,
297 2750 ,
298 2775 ,
299 2800 ,
300 2825 ,
301 2850 ,
302 2875 ,
303 2900 ,
304 2925 ,
305 2950 ,
306 2975 ,
307 3000 ,
308 3025 ,
309 3050 ,
310 3075 ,
311 3100 ,
312 3125 ,
313 3150 ,
314 3175 ,
315 3200 ,
316 3225 ,
317 3250 ,
318 3275 ,
319 3300 ,
320 3325 ,
321 3350 ,
322 3375 ,
323 3400 ,
324 3425 ,
325 3450 ,
326 3475 ,
327 3500 ,
328 3525 ,
329 3550 ,
330 3575 ,
331 3600 ,
332 3625 ,
333 3650 ,
334 3675 ,
335 3700 ,
336 3725 ,
337 3750 ,
338 3775 ,
339 3800 ,
340 3825 ,
341 3850 ,
342 3850 ,
343};
344
345static u8 ab8500_volt_to_regval(int voltage)
346{
347 int i;
348
349 if (voltage < ab8500_fg_lowbat_voltage_map[0])
350 return 0;
351
352 for (i = 0; i < ARRAY_SIZE(ab8500_fg_lowbat_voltage_map); i++) {
353 if (voltage < ab8500_fg_lowbat_voltage_map[i])
354 return (u8) i - 1;
355 }
356
357 /* If not captured above, return index of last element */
358 return (u8) ARRAY_SIZE(ab8500_fg_lowbat_voltage_map) - 1;
359}
360
361/**
362 * ab8500_fg_is_low_curr() - Low or high current mode
363 * @di: pointer to the ab8500_fg structure
364 * @curr: the current to base or our decision on
365 *
366 * Low current mode if the current consumption is below a certain threshold
367 */
368static int ab8500_fg_is_low_curr(struct ab8500_fg *di, int curr)
369{
370 /*
371 * We want to know if we're in low current mode
372 */
373 if (curr > -di->bm->fg_params->high_curr_threshold)
374 return true;
375 else
376 return false;
377}
378
379/**
380 * ab8500_fg_add_cap_sample() - Add capacity to average filter
381 * @di: pointer to the ab8500_fg structure
382 * @sample: the capacity in mAh to add to the filter
383 *
384 * A capacity is added to the filter and a new mean capacity is calculated and
385 * returned
386 */
387static int ab8500_fg_add_cap_sample(struct ab8500_fg *di, int sample)
388{
389 struct timespec ts;
390 struct ab8500_fg_avg_cap *avg = &di->avg_cap;
391
392 getnstimeofday(&ts);
393
394 do {
395 avg->sum += sample - avg->samples[avg->pos];
396 avg->samples[avg->pos] = sample;
397 avg->time_stamps[avg->pos] = ts.tv_sec;
398 avg->pos++;
399
400 if (avg->pos == NBR_AVG_SAMPLES)
401 avg->pos = 0;
402
403 if (avg->nbr_samples < NBR_AVG_SAMPLES)
404 avg->nbr_samples++;
405
406 /*
407 * Check the time stamp for each sample. If too old,
408 * replace with latest sample
409 */
410 } while (ts.tv_sec - VALID_CAPACITY_SEC > avg->time_stamps[avg->pos]);
411
412 avg->avg = avg->sum / avg->nbr_samples;
413
414 return avg->avg;
415}
416
417/**
418 * ab8500_fg_clear_cap_samples() - Clear average filter
419 * @di: pointer to the ab8500_fg structure
420 *
421 * The capacity filter is is reset to zero.
422 */
423static void ab8500_fg_clear_cap_samples(struct ab8500_fg *di)
424{
425 int i;
426 struct ab8500_fg_avg_cap *avg = &di->avg_cap;
427
428 avg->pos = 0;
429 avg->nbr_samples = 0;
430 avg->sum = 0;
431 avg->avg = 0;
432
433 for (i = 0; i < NBR_AVG_SAMPLES; i++) {
434 avg->samples[i] = 0;
435 avg->time_stamps[i] = 0;
436 }
437}
438
439/**
440 * ab8500_fg_fill_cap_sample() - Fill average filter
441 * @di: pointer to the ab8500_fg structure
442 * @sample: the capacity in mAh to fill the filter with
443 *
444 * The capacity filter is filled with a capacity in mAh
445 */
446static void ab8500_fg_fill_cap_sample(struct ab8500_fg *di, int sample)
447{
448 int i;
449 struct timespec ts;
450 struct ab8500_fg_avg_cap *avg = &di->avg_cap;
451
452 getnstimeofday(&ts);
453
454 for (i = 0; i < NBR_AVG_SAMPLES; i++) {
455 avg->samples[i] = sample;
456 avg->time_stamps[i] = ts.tv_sec;
457 }
458
459 avg->pos = 0;
460 avg->nbr_samples = NBR_AVG_SAMPLES;
461 avg->sum = sample * NBR_AVG_SAMPLES;
462 avg->avg = sample;
463}
464
465/**
466 * ab8500_fg_coulomb_counter() - enable coulomb counter
467 * @di: pointer to the ab8500_fg structure
468 * @enable: enable/disable
469 *
470 * Enable/Disable coulomb counter.
471 * On failure returns negative value.
472 */
473static int ab8500_fg_coulomb_counter(struct ab8500_fg *di, bool enable)
474{
475 int ret = 0;
476 mutex_lock(&di->cc_lock);
477 if (enable) {
478 /* To be able to reprogram the number of samples, we have to
479 * first stop the CC and then enable it again */
480 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
481 AB8500_RTC_CC_CONF_REG, 0x00);
482 if (ret)
483 goto cc_err;
484
485 /* Program the samples */
486 ret = abx500_set_register_interruptible(di->dev,
487 AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU,
488 di->fg_samples);
489 if (ret)
490 goto cc_err;
491
492 /* Start the CC */
493 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
494 AB8500_RTC_CC_CONF_REG,
495 (CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA));
496 if (ret)
497 goto cc_err;
498
499 di->flags.fg_enabled = true;
500 } else {
501 /* Clear any pending read requests */
502 ret = abx500_mask_and_set_register_interruptible(di->dev,
503 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
504 (RESET_ACCU | READ_REQ), 0);
505 if (ret)
506 goto cc_err;
507
508 ret = abx500_set_register_interruptible(di->dev,
509 AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU_CTRL, 0);
510 if (ret)
511 goto cc_err;
512
513 /* Stop the CC */
514 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
515 AB8500_RTC_CC_CONF_REG, 0);
516 if (ret)
517 goto cc_err;
518
519 di->flags.fg_enabled = false;
520
521 }
522 dev_dbg(di->dev, " CC enabled: %d Samples: %d\n",
523 enable, di->fg_samples);
524
525 mutex_unlock(&di->cc_lock);
526
527 return ret;
528cc_err:
529 dev_err(di->dev, "%s Enabling coulomb counter failed\n", __func__);
530 mutex_unlock(&di->cc_lock);
531 return ret;
532}
533
534/**
535 * ab8500_fg_inst_curr_start() - start battery instantaneous current
536 * @di: pointer to the ab8500_fg structure
537 *
538 * Returns 0 or error code
539 * Note: This is part "one" and has to be called before
540 * ab8500_fg_inst_curr_finalize()
541 */
542int ab8500_fg_inst_curr_start(struct ab8500_fg *di)
543{
544 u8 reg_val;
545 int ret;
546
547 mutex_lock(&di->cc_lock);
548
549 di->nbr_cceoc_irq_cnt = 0;
550 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
551 AB8500_RTC_CC_CONF_REG, ®_val);
552 if (ret < 0)
553 goto fail;
554
555 if (!(reg_val & CC_PWR_UP_ENA)) {
556 dev_dbg(di->dev, "%s Enable FG\n", __func__);
557 di->turn_off_fg = true;
558
559 /* Program the samples */
560 ret = abx500_set_register_interruptible(di->dev,
561 AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU,
562 SEC_TO_SAMPLE(10));
563 if (ret)
564 goto fail;
565
566 /* Start the CC */
567 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
568 AB8500_RTC_CC_CONF_REG,
569 (CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA));
570 if (ret)
571 goto fail;
572 } else {
573 di->turn_off_fg = false;
574 }
575
576 /* Return and WFI */
577 reinit_completion(&di->ab8500_fg_started);
578 reinit_completion(&di->ab8500_fg_complete);
579 enable_irq(di->irq);
580
581 /* Note: cc_lock is still locked */
582 return 0;
583fail:
584 mutex_unlock(&di->cc_lock);
585 return ret;
586}
587
588/**
589 * ab8500_fg_inst_curr_started() - check if fg conversion has started
590 * @di: pointer to the ab8500_fg structure
591 *
592 * Returns 1 if conversion started, 0 if still waiting
593 */
594int ab8500_fg_inst_curr_started(struct ab8500_fg *di)
595{
596 return completion_done(&di->ab8500_fg_started);
597}
598
599/**
600 * ab8500_fg_inst_curr_done() - check if fg conversion is done
601 * @di: pointer to the ab8500_fg structure
602 *
603 * Returns 1 if conversion done, 0 if still waiting
604 */
605int ab8500_fg_inst_curr_done(struct ab8500_fg *di)
606{
607 return completion_done(&di->ab8500_fg_complete);
608}
609
610/**
611 * ab8500_fg_inst_curr_finalize() - battery instantaneous current
612 * @di: pointer to the ab8500_fg structure
613 * @res: battery instantenous current(on success)
614 *
615 * Returns 0 or an error code
616 * Note: This is part "two" and has to be called at earliest 250 ms
617 * after ab8500_fg_inst_curr_start()
618 */
619int ab8500_fg_inst_curr_finalize(struct ab8500_fg *di, int *res)
620{
621 u8 low, high;
622 int val;
623 int ret;
624 int timeout;
625
626 if (!completion_done(&di->ab8500_fg_complete)) {
627 timeout = wait_for_completion_timeout(
628 &di->ab8500_fg_complete,
629 INS_CURR_TIMEOUT);
630 dev_dbg(di->dev, "Finalize time: %d ms\n",
631 ((INS_CURR_TIMEOUT - timeout) * 1000) / HZ);
632 if (!timeout) {
633 ret = -ETIME;
634 disable_irq(di->irq);
635 di->nbr_cceoc_irq_cnt = 0;
636 dev_err(di->dev, "completion timed out [%d]\n",
637 __LINE__);
638 goto fail;
639 }
640 }
641
642 disable_irq(di->irq);
643 di->nbr_cceoc_irq_cnt = 0;
644
645 ret = abx500_mask_and_set_register_interruptible(di->dev,
646 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
647 READ_REQ, READ_REQ);
648
649 /* 100uS between read request and read is needed */
650 usleep_range(100, 100);
651
652 /* Read CC Sample conversion value Low and high */
653 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
654 AB8500_GASG_CC_SMPL_CNVL_REG, &low);
655 if (ret < 0)
656 goto fail;
657
658 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
659 AB8500_GASG_CC_SMPL_CNVH_REG, &high);
660 if (ret < 0)
661 goto fail;
662
663 /*
664 * negative value for Discharging
665 * convert 2's compliment into decimal
666 */
667 if (high & 0x10)
668 val = (low | (high << 8) | 0xFFFFE000);
669 else
670 val = (low | (high << 8));
671
672 /*
673 * Convert to unit value in mA
674 * Full scale input voltage is
675 * 63.160mV => LSB = 63.160mV/(4096*res) = 1.542mA
676 * Given a 250ms conversion cycle time the LSB corresponds
677 * to 107.1 nAh. Convert to current by dividing by the conversion
678 * time in hours (250ms = 1 / (3600 * 4)h)
679 * 107.1nAh assumes 10mOhm, but fg_res is in 0.1mOhm
680 */
681 val = (val * QLSB_NANO_AMP_HOURS_X10 * 36 * 4) /
682 (1000 * di->bm->fg_res);
683
684 if (di->turn_off_fg) {
685 dev_dbg(di->dev, "%s Disable FG\n", __func__);
686
687 /* Clear any pending read requests */
688 ret = abx500_set_register_interruptible(di->dev,
689 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, 0);
690 if (ret)
691 goto fail;
692
693 /* Stop the CC */
694 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
695 AB8500_RTC_CC_CONF_REG, 0);
696 if (ret)
697 goto fail;
698 }
699 mutex_unlock(&di->cc_lock);
700 (*res) = val;
701
702 return 0;
703fail:
704 mutex_unlock(&di->cc_lock);
705 return ret;
706}
707
708/**
709 * ab8500_fg_inst_curr_blocking() - battery instantaneous current
710 * @di: pointer to the ab8500_fg structure
711 * @res: battery instantenous current(on success)
712 *
713 * Returns 0 else error code
714 */
715int ab8500_fg_inst_curr_blocking(struct ab8500_fg *di)
716{
717 int ret;
718 int timeout;
719 int res = 0;
720
721 ret = ab8500_fg_inst_curr_start(di);
722 if (ret) {
723 dev_err(di->dev, "Failed to initialize fg_inst\n");
724 return 0;
725 }
726
727 /* Wait for CC to actually start */
728 if (!completion_done(&di->ab8500_fg_started)) {
729 timeout = wait_for_completion_timeout(
730 &di->ab8500_fg_started,
731 INS_CURR_TIMEOUT);
732 dev_dbg(di->dev, "Start time: %d ms\n",
733 ((INS_CURR_TIMEOUT - timeout) * 1000) / HZ);
734 if (!timeout) {
735 ret = -ETIME;
736 dev_err(di->dev, "completion timed out [%d]\n",
737 __LINE__);
738 goto fail;
739 }
740 }
741
742 ret = ab8500_fg_inst_curr_finalize(di, &res);
743 if (ret) {
744 dev_err(di->dev, "Failed to finalize fg_inst\n");
745 return 0;
746 }
747
748 dev_dbg(di->dev, "%s instant current: %d", __func__, res);
749 return res;
750fail:
751 disable_irq(di->irq);
752 mutex_unlock(&di->cc_lock);
753 return ret;
754}
755
756/**
757 * ab8500_fg_acc_cur_work() - average battery current
758 * @work: pointer to the work_struct structure
759 *
760 * Updated the average battery current obtained from the
761 * coulomb counter.
762 */
763static void ab8500_fg_acc_cur_work(struct work_struct *work)
764{
765 int val;
766 int ret;
767 u8 low, med, high;
768
769 struct ab8500_fg *di = container_of(work,
770 struct ab8500_fg, fg_acc_cur_work);
771
772 mutex_lock(&di->cc_lock);
773 ret = abx500_set_register_interruptible(di->dev, AB8500_GAS_GAUGE,
774 AB8500_GASG_CC_NCOV_ACCU_CTRL, RD_NCONV_ACCU_REQ);
775 if (ret)
776 goto exit;
777
778 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
779 AB8500_GASG_CC_NCOV_ACCU_LOW, &low);
780 if (ret < 0)
781 goto exit;
782
783 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
784 AB8500_GASG_CC_NCOV_ACCU_MED, &med);
785 if (ret < 0)
786 goto exit;
787
788 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
789 AB8500_GASG_CC_NCOV_ACCU_HIGH, &high);
790 if (ret < 0)
791 goto exit;
792
793 /* Check for sign bit in case of negative value, 2's compliment */
794 if (high & 0x10)
795 val = (low | (med << 8) | (high << 16) | 0xFFE00000);
796 else
797 val = (low | (med << 8) | (high << 16));
798
799 /*
800 * Convert to uAh
801 * Given a 250ms conversion cycle time the LSB corresponds
802 * to 112.9 nAh.
803 * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm
804 */
805 di->accu_charge = (val * QLSB_NANO_AMP_HOURS_X10) /
806 (100 * di->bm->fg_res);
807
808 /*
809 * Convert to unit value in mA
810 * by dividing by the conversion
811 * time in hours (= samples / (3600 * 4)h)
812 * and multiply with 1000
813 */
814 di->avg_curr = (val * QLSB_NANO_AMP_HOURS_X10 * 36) /
815 (1000 * di->bm->fg_res * (di->fg_samples / 4));
816
817 di->flags.conv_done = true;
818
819 mutex_unlock(&di->cc_lock);
820
821 queue_work(di->fg_wq, &di->fg_work);
822
823 dev_dbg(di->dev, "fg_res: %d, fg_samples: %d, gasg: %d, accu_charge: %d \n",
824 di->bm->fg_res, di->fg_samples, val, di->accu_charge);
825 return;
826exit:
827 dev_err(di->dev,
828 "Failed to read or write gas gauge registers\n");
829 mutex_unlock(&di->cc_lock);
830 queue_work(di->fg_wq, &di->fg_work);
831}
832
833/**
834 * ab8500_fg_bat_voltage() - get battery voltage
835 * @di: pointer to the ab8500_fg structure
836 *
837 * Returns battery voltage(on success) else error code
838 */
839static int ab8500_fg_bat_voltage(struct ab8500_fg *di)
840{
841 int vbat;
842 static int prev;
843
844 vbat = ab8500_gpadc_convert(di->gpadc, MAIN_BAT_V);
845 if (vbat < 0) {
846 dev_err(di->dev,
847 "%s gpadc conversion failed, using previous value\n",
848 __func__);
849 return prev;
850 }
851
852 prev = vbat;
853 return vbat;
854}
855
856/**
857 * ab8500_fg_volt_to_capacity() - Voltage based capacity
858 * @di: pointer to the ab8500_fg structure
859 * @voltage: The voltage to convert to a capacity
860 *
861 * Returns battery capacity in per mille based on voltage
862 */
863static int ab8500_fg_volt_to_capacity(struct ab8500_fg *di, int voltage)
864{
865 int i, tbl_size;
866 const struct abx500_v_to_cap *tbl;
867 int cap = 0;
868
869 tbl = di->bm->bat_type[di->bm->batt_id].v_to_cap_tbl,
870 tbl_size = di->bm->bat_type[di->bm->batt_id].n_v_cap_tbl_elements;
871
872 for (i = 0; i < tbl_size; ++i) {
873 if (voltage > tbl[i].voltage)
874 break;
875 }
876
877 if ((i > 0) && (i < tbl_size)) {
878 cap = interpolate(voltage,
879 tbl[i].voltage,
880 tbl[i].capacity * 10,
881 tbl[i-1].voltage,
882 tbl[i-1].capacity * 10);
883 } else if (i == 0) {
884 cap = 1000;
885 } else {
886 cap = 0;
887 }
888
889 dev_dbg(di->dev, "%s Vbat: %d, Cap: %d per mille",
890 __func__, voltage, cap);
891
892 return cap;
893}
894
895/**
896 * ab8500_fg_uncomp_volt_to_capacity() - Uncompensated voltage based capacity
897 * @di: pointer to the ab8500_fg structure
898 *
899 * Returns battery capacity based on battery voltage that is not compensated
900 * for the voltage drop due to the load
901 */
902static int ab8500_fg_uncomp_volt_to_capacity(struct ab8500_fg *di)
903{
904 di->vbat = ab8500_fg_bat_voltage(di);
905 return ab8500_fg_volt_to_capacity(di, di->vbat);
906}
907
908/**
909 * ab8500_fg_battery_resistance() - Returns the battery inner resistance
910 * @di: pointer to the ab8500_fg structure
911 *
912 * Returns battery inner resistance added with the fuel gauge resistor value
913 * to get the total resistance in the whole link from gnd to bat+ node.
914 */
915static int ab8500_fg_battery_resistance(struct ab8500_fg *di)
916{
917 int i, tbl_size;
918 const struct batres_vs_temp *tbl;
919 int resist = 0;
920
921 tbl = di->bm->bat_type[di->bm->batt_id].batres_tbl;
922 tbl_size = di->bm->bat_type[di->bm->batt_id].n_batres_tbl_elements;
923
924 for (i = 0; i < tbl_size; ++i) {
925 if (di->bat_temp / 10 > tbl[i].temp)
926 break;
927 }
928
929 if ((i > 0) && (i < tbl_size)) {
930 resist = interpolate(di->bat_temp / 10,
931 tbl[i].temp,
932 tbl[i].resist,
933 tbl[i-1].temp,
934 tbl[i-1].resist);
935 } else if (i == 0) {
936 resist = tbl[0].resist;
937 } else {
938 resist = tbl[tbl_size - 1].resist;
939 }
940
941 dev_dbg(di->dev, "%s Temp: %d battery internal resistance: %d"
942 " fg resistance %d, total: %d (mOhm)\n",
943 __func__, di->bat_temp, resist, di->bm->fg_res / 10,
944 (di->bm->fg_res / 10) + resist);
945
946 /* fg_res variable is in 0.1mOhm */
947 resist += di->bm->fg_res / 10;
948
949 return resist;
950}
951
952/**
953 * ab8500_fg_load_comp_volt_to_capacity() - Load compensated voltage based capacity
954 * @di: pointer to the ab8500_fg structure
955 *
956 * Returns battery capacity based on battery voltage that is load compensated
957 * for the voltage drop
958 */
959static int ab8500_fg_load_comp_volt_to_capacity(struct ab8500_fg *di)
960{
961 int vbat_comp, res;
962 int i = 0;
963 int vbat = 0;
964
965 ab8500_fg_inst_curr_start(di);
966
967 do {
968 vbat += ab8500_fg_bat_voltage(di);
969 i++;
970 usleep_range(5000, 6000);
971 } while (!ab8500_fg_inst_curr_done(di));
972
973 ab8500_fg_inst_curr_finalize(di, &di->inst_curr);
974
975 di->vbat = vbat / i;
976 res = ab8500_fg_battery_resistance(di);
977
978 /* Use Ohms law to get the load compensated voltage */
979 vbat_comp = di->vbat - (di->inst_curr * res) / 1000;
980
981 dev_dbg(di->dev, "%s Measured Vbat: %dmV,Compensated Vbat %dmV, "
982 "R: %dmOhm, Current: %dmA Vbat Samples: %d\n",
983 __func__, di->vbat, vbat_comp, res, di->inst_curr, i);
984
985 return ab8500_fg_volt_to_capacity(di, vbat_comp);
986}
987
988/**
989 * ab8500_fg_convert_mah_to_permille() - Capacity in mAh to permille
990 * @di: pointer to the ab8500_fg structure
991 * @cap_mah: capacity in mAh
992 *
993 * Converts capacity in mAh to capacity in permille
994 */
995static int ab8500_fg_convert_mah_to_permille(struct ab8500_fg *di, int cap_mah)
996{
997 return (cap_mah * 1000) / di->bat_cap.max_mah_design;
998}
999
1000/**
1001 * ab8500_fg_convert_permille_to_mah() - Capacity in permille to mAh
1002 * @di: pointer to the ab8500_fg structure
1003 * @cap_pm: capacity in permille
1004 *
1005 * Converts capacity in permille to capacity in mAh
1006 */
1007static int ab8500_fg_convert_permille_to_mah(struct ab8500_fg *di, int cap_pm)
1008{
1009 return cap_pm * di->bat_cap.max_mah_design / 1000;
1010}
1011
1012/**
1013 * ab8500_fg_convert_mah_to_uwh() - Capacity in mAh to uWh
1014 * @di: pointer to the ab8500_fg structure
1015 * @cap_mah: capacity in mAh
1016 *
1017 * Converts capacity in mAh to capacity in uWh
1018 */
1019static int ab8500_fg_convert_mah_to_uwh(struct ab8500_fg *di, int cap_mah)
1020{
1021 u64 div_res;
1022 u32 div_rem;
1023
1024 div_res = ((u64) cap_mah) * ((u64) di->vbat_nom);
1025 div_rem = do_div(div_res, 1000);
1026
1027 /* Make sure to round upwards if necessary */
1028 if (div_rem >= 1000 / 2)
1029 div_res++;
1030
1031 return (int) div_res;
1032}
1033
1034/**
1035 * ab8500_fg_calc_cap_charging() - Calculate remaining capacity while charging
1036 * @di: pointer to the ab8500_fg structure
1037 *
1038 * Return the capacity in mAh based on previous calculated capcity and the FG
1039 * accumulator register value. The filter is filled with this capacity
1040 */
1041static int ab8500_fg_calc_cap_charging(struct ab8500_fg *di)
1042{
1043 dev_dbg(di->dev, "%s cap_mah %d accu_charge %d\n",
1044 __func__,
1045 di->bat_cap.mah,
1046 di->accu_charge);
1047
1048 /* Capacity should not be less than 0 */
1049 if (di->bat_cap.mah + di->accu_charge > 0)
1050 di->bat_cap.mah += di->accu_charge;
1051 else
1052 di->bat_cap.mah = 0;
1053 /*
1054 * We force capacity to 100% once when the algorithm
1055 * reports that it's full.
1056 */
1057 if (di->bat_cap.mah >= di->bat_cap.max_mah_design ||
1058 di->flags.force_full) {
1059 di->bat_cap.mah = di->bat_cap.max_mah_design;
1060 }
1061
1062 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
1063 di->bat_cap.permille =
1064 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1065
1066 /* We need to update battery voltage and inst current when charging */
1067 di->vbat = ab8500_fg_bat_voltage(di);
1068 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1069
1070 return di->bat_cap.mah;
1071}
1072
1073/**
1074 * ab8500_fg_calc_cap_discharge_voltage() - Capacity in discharge with voltage
1075 * @di: pointer to the ab8500_fg structure
1076 * @comp: if voltage should be load compensated before capacity calc
1077 *
1078 * Return the capacity in mAh based on the battery voltage. The voltage can
1079 * either be load compensated or not. This value is added to the filter and a
1080 * new mean value is calculated and returned.
1081 */
1082static int ab8500_fg_calc_cap_discharge_voltage(struct ab8500_fg *di, bool comp)
1083{
1084 int permille, mah;
1085
1086 if (comp)
1087 permille = ab8500_fg_load_comp_volt_to_capacity(di);
1088 else
1089 permille = ab8500_fg_uncomp_volt_to_capacity(di);
1090
1091 mah = ab8500_fg_convert_permille_to_mah(di, permille);
1092
1093 di->bat_cap.mah = ab8500_fg_add_cap_sample(di, mah);
1094 di->bat_cap.permille =
1095 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1096
1097 return di->bat_cap.mah;
1098}
1099
1100/**
1101 * ab8500_fg_calc_cap_discharge_fg() - Capacity in discharge with FG
1102 * @di: pointer to the ab8500_fg structure
1103 *
1104 * Return the capacity in mAh based on previous calculated capcity and the FG
1105 * accumulator register value. This value is added to the filter and a
1106 * new mean value is calculated and returned.
1107 */
1108static int ab8500_fg_calc_cap_discharge_fg(struct ab8500_fg *di)
1109{
1110 int permille_volt, permille;
1111
1112 dev_dbg(di->dev, "%s cap_mah %d accu_charge %d\n",
1113 __func__,
1114 di->bat_cap.mah,
1115 di->accu_charge);
1116
1117 /* Capacity should not be less than 0 */
1118 if (di->bat_cap.mah + di->accu_charge > 0)
1119 di->bat_cap.mah += di->accu_charge;
1120 else
1121 di->bat_cap.mah = 0;
1122
1123 if (di->bat_cap.mah >= di->bat_cap.max_mah_design)
1124 di->bat_cap.mah = di->bat_cap.max_mah_design;
1125
1126 /*
1127 * Check against voltage based capacity. It can not be lower
1128 * than what the uncompensated voltage says
1129 */
1130 permille = ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1131 permille_volt = ab8500_fg_uncomp_volt_to_capacity(di);
1132
1133 if (permille < permille_volt) {
1134 di->bat_cap.permille = permille_volt;
1135 di->bat_cap.mah = ab8500_fg_convert_permille_to_mah(di,
1136 di->bat_cap.permille);
1137
1138 dev_dbg(di->dev, "%s voltage based: perm %d perm_volt %d\n",
1139 __func__,
1140 permille,
1141 permille_volt);
1142
1143 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
1144 } else {
1145 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
1146 di->bat_cap.permille =
1147 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1148 }
1149
1150 return di->bat_cap.mah;
1151}
1152
1153/**
1154 * ab8500_fg_capacity_level() - Get the battery capacity level
1155 * @di: pointer to the ab8500_fg structure
1156 *
1157 * Get the battery capacity level based on the capacity in percent
1158 */
1159static int ab8500_fg_capacity_level(struct ab8500_fg *di)
1160{
1161 int ret, percent;
1162
1163 percent = DIV_ROUND_CLOSEST(di->bat_cap.permille, 10);
1164
1165 if (percent <= di->bm->cap_levels->critical ||
1166 di->flags.low_bat)
1167 ret = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
1168 else if (percent <= di->bm->cap_levels->low)
1169 ret = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
1170 else if (percent <= di->bm->cap_levels->normal)
1171 ret = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
1172 else if (percent <= di->bm->cap_levels->high)
1173 ret = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;
1174 else
1175 ret = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
1176
1177 return ret;
1178}
1179
1180/**
1181 * ab8500_fg_calculate_scaled_capacity() - Capacity scaling
1182 * @di: pointer to the ab8500_fg structure
1183 *
1184 * Calculates the capacity to be shown to upper layers. Scales the capacity
1185 * to have 100% as a reference from the actual capacity upon removal of charger
1186 * when charging is in maintenance mode.
1187 */
1188static int ab8500_fg_calculate_scaled_capacity(struct ab8500_fg *di)
1189{
1190 struct ab8500_fg_cap_scaling *cs = &di->bat_cap.cap_scale;
1191 int capacity = di->bat_cap.prev_percent;
1192
1193 if (!cs->enable)
1194 return capacity;
1195
1196 /*
1197 * As long as we are in fully charge mode scale the capacity
1198 * to show 100%.
1199 */
1200 if (di->flags.fully_charged) {
1201 cs->cap_to_scale[0] = 100;
1202 cs->cap_to_scale[1] =
1203 max(capacity, di->bm->fg_params->maint_thres);
1204 dev_dbg(di->dev, "Scale cap with %d/%d\n",
1205 cs->cap_to_scale[0], cs->cap_to_scale[1]);
1206 }
1207
1208 /* Calculates the scaled capacity. */
1209 if ((cs->cap_to_scale[0] != cs->cap_to_scale[1])
1210 && (cs->cap_to_scale[1] > 0))
1211 capacity = min(100,
1212 DIV_ROUND_CLOSEST(di->bat_cap.prev_percent *
1213 cs->cap_to_scale[0],
1214 cs->cap_to_scale[1]));
1215
1216 if (di->flags.charging) {
1217 if (capacity < cs->disable_cap_level) {
1218 cs->disable_cap_level = capacity;
1219 dev_dbg(di->dev, "Cap to stop scale lowered %d%%\n",
1220 cs->disable_cap_level);
1221 } else if (!di->flags.fully_charged) {
1222 if (di->bat_cap.prev_percent >=
1223 cs->disable_cap_level) {
1224 dev_dbg(di->dev, "Disabling scaled capacity\n");
1225 cs->enable = false;
1226 capacity = di->bat_cap.prev_percent;
1227 } else {
1228 dev_dbg(di->dev,
1229 "Waiting in cap to level %d%%\n",
1230 cs->disable_cap_level);
1231 capacity = cs->disable_cap_level;
1232 }
1233 }
1234 }
1235
1236 return capacity;
1237}
1238
1239/**
1240 * ab8500_fg_update_cap_scalers() - Capacity scaling
1241 * @di: pointer to the ab8500_fg structure
1242 *
1243 * To be called when state change from charge<->discharge to update
1244 * the capacity scalers.
1245 */
1246static void ab8500_fg_update_cap_scalers(struct ab8500_fg *di)
1247{
1248 struct ab8500_fg_cap_scaling *cs = &di->bat_cap.cap_scale;
1249
1250 if (!cs->enable)
1251 return;
1252 if (di->flags.charging) {
1253 di->bat_cap.cap_scale.disable_cap_level =
1254 di->bat_cap.cap_scale.scaled_cap;
1255 dev_dbg(di->dev, "Cap to stop scale at charge %d%%\n",
1256 di->bat_cap.cap_scale.disable_cap_level);
1257 } else {
1258 if (cs->scaled_cap != 100) {
1259 cs->cap_to_scale[0] = cs->scaled_cap;
1260 cs->cap_to_scale[1] = di->bat_cap.prev_percent;
1261 } else {
1262 cs->cap_to_scale[0] = 100;
1263 cs->cap_to_scale[1] =
1264 max(di->bat_cap.prev_percent,
1265 di->bm->fg_params->maint_thres);
1266 }
1267
1268 dev_dbg(di->dev, "Cap to scale at discharge %d/%d\n",
1269 cs->cap_to_scale[0], cs->cap_to_scale[1]);
1270 }
1271}
1272
1273/**
1274 * ab8500_fg_check_capacity_limits() - Check if capacity has changed
1275 * @di: pointer to the ab8500_fg structure
1276 * @init: capacity is allowed to go up in init mode
1277 *
1278 * Check if capacity or capacity limit has changed and notify the system
1279 * about it using the power_supply framework
1280 */
1281static void ab8500_fg_check_capacity_limits(struct ab8500_fg *di, bool init)
1282{
1283 bool changed = false;
1284 int percent = DIV_ROUND_CLOSEST(di->bat_cap.permille, 10);
1285
1286 di->bat_cap.level = ab8500_fg_capacity_level(di);
1287
1288 if (di->bat_cap.level != di->bat_cap.prev_level) {
1289 /*
1290 * We do not allow reported capacity level to go up
1291 * unless we're charging or if we're in init
1292 */
1293 if (!(!di->flags.charging && di->bat_cap.level >
1294 di->bat_cap.prev_level) || init) {
1295 dev_dbg(di->dev, "level changed from %d to %d\n",
1296 di->bat_cap.prev_level,
1297 di->bat_cap.level);
1298 di->bat_cap.prev_level = di->bat_cap.level;
1299 changed = true;
1300 } else {
1301 dev_dbg(di->dev, "level not allowed to go up "
1302 "since no charger is connected: %d to %d\n",
1303 di->bat_cap.prev_level,
1304 di->bat_cap.level);
1305 }
1306 }
1307
1308 /*
1309 * If we have received the LOW_BAT IRQ, set capacity to 0 to initiate
1310 * shutdown
1311 */
1312 if (di->flags.low_bat) {
1313 dev_dbg(di->dev, "Battery low, set capacity to 0\n");
1314 di->bat_cap.prev_percent = 0;
1315 di->bat_cap.permille = 0;
1316 percent = 0;
1317 di->bat_cap.prev_mah = 0;
1318 di->bat_cap.mah = 0;
1319 changed = true;
1320 } else if (di->flags.fully_charged) {
1321 /*
1322 * We report 100% if algorithm reported fully charged
1323 * and show 100% during maintenance charging (scaling).
1324 */
1325 if (di->flags.force_full) {
1326 di->bat_cap.prev_percent = percent;
1327 di->bat_cap.prev_mah = di->bat_cap.mah;
1328
1329 changed = true;
1330
1331 if (!di->bat_cap.cap_scale.enable &&
1332 di->bm->capacity_scaling) {
1333 di->bat_cap.cap_scale.enable = true;
1334 di->bat_cap.cap_scale.cap_to_scale[0] = 100;
1335 di->bat_cap.cap_scale.cap_to_scale[1] =
1336 di->bat_cap.prev_percent;
1337 di->bat_cap.cap_scale.disable_cap_level = 100;
1338 }
1339 } else if (di->bat_cap.prev_percent != percent) {
1340 dev_dbg(di->dev,
1341 "battery reported full "
1342 "but capacity dropping: %d\n",
1343 percent);
1344 di->bat_cap.prev_percent = percent;
1345 di->bat_cap.prev_mah = di->bat_cap.mah;
1346
1347 changed = true;
1348 }
1349 } else if (di->bat_cap.prev_percent != percent) {
1350 if (percent == 0) {
1351 /*
1352 * We will not report 0% unless we've got
1353 * the LOW_BAT IRQ, no matter what the FG
1354 * algorithm says.
1355 */
1356 di->bat_cap.prev_percent = 1;
1357 percent = 1;
1358
1359 changed = true;
1360 } else if (!(!di->flags.charging &&
1361 percent > di->bat_cap.prev_percent) || init) {
1362 /*
1363 * We do not allow reported capacity to go up
1364 * unless we're charging or if we're in init
1365 */
1366 dev_dbg(di->dev,
1367 "capacity changed from %d to %d (%d)\n",
1368 di->bat_cap.prev_percent,
1369 percent,
1370 di->bat_cap.permille);
1371 di->bat_cap.prev_percent = percent;
1372 di->bat_cap.prev_mah = di->bat_cap.mah;
1373
1374 changed = true;
1375 } else {
1376 dev_dbg(di->dev, "capacity not allowed to go up since "
1377 "no charger is connected: %d to %d (%d)\n",
1378 di->bat_cap.prev_percent,
1379 percent,
1380 di->bat_cap.permille);
1381 }
1382 }
1383
1384 if (changed) {
1385 if (di->bm->capacity_scaling) {
1386 di->bat_cap.cap_scale.scaled_cap =
1387 ab8500_fg_calculate_scaled_capacity(di);
1388
1389 dev_info(di->dev, "capacity=%d (%d)\n",
1390 di->bat_cap.prev_percent,
1391 di->bat_cap.cap_scale.scaled_cap);
1392 }
1393 power_supply_changed(&di->fg_psy);
1394 if (di->flags.fully_charged && di->flags.force_full) {
1395 dev_dbg(di->dev, "Battery full, notifying.\n");
1396 di->flags.force_full = false;
1397 sysfs_notify(&di->fg_kobject, NULL, "charge_full");
1398 }
1399 sysfs_notify(&di->fg_kobject, NULL, "charge_now");
1400 }
1401}
1402
1403static void ab8500_fg_charge_state_to(struct ab8500_fg *di,
1404 enum ab8500_fg_charge_state new_state)
1405{
1406 dev_dbg(di->dev, "Charge state from %d [%s] to %d [%s]\n",
1407 di->charge_state,
1408 charge_state[di->charge_state],
1409 new_state,
1410 charge_state[new_state]);
1411
1412 di->charge_state = new_state;
1413}
1414
1415static void ab8500_fg_discharge_state_to(struct ab8500_fg *di,
1416 enum ab8500_fg_discharge_state new_state)
1417{
1418 dev_dbg(di->dev, "Disharge state from %d [%s] to %d [%s]\n",
1419 di->discharge_state,
1420 discharge_state[di->discharge_state],
1421 new_state,
1422 discharge_state[new_state]);
1423
1424 di->discharge_state = new_state;
1425}
1426
1427/**
1428 * ab8500_fg_algorithm_charging() - FG algorithm for when charging
1429 * @di: pointer to the ab8500_fg structure
1430 *
1431 * Battery capacity calculation state machine for when we're charging
1432 */
1433static void ab8500_fg_algorithm_charging(struct ab8500_fg *di)
1434{
1435 /*
1436 * If we change to discharge mode
1437 * we should start with recovery
1438 */
1439 if (di->discharge_state != AB8500_FG_DISCHARGE_INIT_RECOVERY)
1440 ab8500_fg_discharge_state_to(di,
1441 AB8500_FG_DISCHARGE_INIT_RECOVERY);
1442
1443 switch (di->charge_state) {
1444 case AB8500_FG_CHARGE_INIT:
1445 di->fg_samples = SEC_TO_SAMPLE(
1446 di->bm->fg_params->accu_charging);
1447
1448 ab8500_fg_coulomb_counter(di, true);
1449 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_READOUT);
1450
1451 break;
1452
1453 case AB8500_FG_CHARGE_READOUT:
1454 /*
1455 * Read the FG and calculate the new capacity
1456 */
1457 mutex_lock(&di->cc_lock);
1458 if (!di->flags.conv_done && !di->flags.force_full) {
1459 /* Wasn't the CC IRQ that got us here */
1460 mutex_unlock(&di->cc_lock);
1461 dev_dbg(di->dev, "%s CC conv not done\n",
1462 __func__);
1463
1464 break;
1465 }
1466 di->flags.conv_done = false;
1467 mutex_unlock(&di->cc_lock);
1468
1469 ab8500_fg_calc_cap_charging(di);
1470
1471 break;
1472
1473 default:
1474 break;
1475 }
1476
1477 /* Check capacity limits */
1478 ab8500_fg_check_capacity_limits(di, false);
1479}
1480
1481static void force_capacity(struct ab8500_fg *di)
1482{
1483 int cap;
1484
1485 ab8500_fg_clear_cap_samples(di);
1486 cap = di->bat_cap.user_mah;
1487 if (cap > di->bat_cap.max_mah_design) {
1488 dev_dbg(di->dev, "Remaining cap %d can't be bigger than total"
1489 " %d\n", cap, di->bat_cap.max_mah_design);
1490 cap = di->bat_cap.max_mah_design;
1491 }
1492 ab8500_fg_fill_cap_sample(di, di->bat_cap.user_mah);
1493 di->bat_cap.permille = ab8500_fg_convert_mah_to_permille(di, cap);
1494 di->bat_cap.mah = cap;
1495 ab8500_fg_check_capacity_limits(di, true);
1496}
1497
1498static bool check_sysfs_capacity(struct ab8500_fg *di)
1499{
1500 int cap, lower, upper;
1501 int cap_permille;
1502
1503 cap = di->bat_cap.user_mah;
1504
1505 cap_permille = ab8500_fg_convert_mah_to_permille(di,
1506 di->bat_cap.user_mah);
1507
1508 lower = di->bat_cap.permille - di->bm->fg_params->user_cap_limit * 10;
1509 upper = di->bat_cap.permille + di->bm->fg_params->user_cap_limit * 10;
1510
1511 if (lower < 0)
1512 lower = 0;
1513 /* 1000 is permille, -> 100 percent */
1514 if (upper > 1000)
1515 upper = 1000;
1516
1517 dev_dbg(di->dev, "Capacity limits:"
1518 " (Lower: %d User: %d Upper: %d) [user: %d, was: %d]\n",
1519 lower, cap_permille, upper, cap, di->bat_cap.mah);
1520
1521 /* If within limits, use the saved capacity and exit estimation...*/
1522 if (cap_permille > lower && cap_permille < upper) {
1523 dev_dbg(di->dev, "OK! Using users cap %d uAh now\n", cap);
1524 force_capacity(di);
1525 return true;
1526 }
1527 dev_dbg(di->dev, "Capacity from user out of limits, ignoring");
1528 return false;
1529}
1530
1531/**
1532 * ab8500_fg_algorithm_discharging() - FG algorithm for when discharging
1533 * @di: pointer to the ab8500_fg structure
1534 *
1535 * Battery capacity calculation state machine for when we're discharging
1536 */
1537static void ab8500_fg_algorithm_discharging(struct ab8500_fg *di)
1538{
1539 int sleep_time;
1540
1541 /* If we change to charge mode we should start with init */
1542 if (di->charge_state != AB8500_FG_CHARGE_INIT)
1543 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
1544
1545 switch (di->discharge_state) {
1546 case AB8500_FG_DISCHARGE_INIT:
1547 /* We use the FG IRQ to work on */
1548 di->init_cnt = 0;
1549 di->fg_samples = SEC_TO_SAMPLE(di->bm->fg_params->init_timer);
1550 ab8500_fg_coulomb_counter(di, true);
1551 ab8500_fg_discharge_state_to(di,
1552 AB8500_FG_DISCHARGE_INITMEASURING);
1553
1554 /* Intentional fallthrough */
1555 case AB8500_FG_DISCHARGE_INITMEASURING:
1556 /*
1557 * Discard a number of samples during startup.
1558 * After that, use compensated voltage for a few
1559 * samples to get an initial capacity.
1560 * Then go to READOUT
1561 */
1562 sleep_time = di->bm->fg_params->init_timer;
1563
1564 /* Discard the first [x] seconds */
1565 if (di->init_cnt > di->bm->fg_params->init_discard_time) {
1566 ab8500_fg_calc_cap_discharge_voltage(di, true);
1567
1568 ab8500_fg_check_capacity_limits(di, true);
1569 }
1570
1571 di->init_cnt += sleep_time;
1572 if (di->init_cnt > di->bm->fg_params->init_total_time)
1573 ab8500_fg_discharge_state_to(di,
1574 AB8500_FG_DISCHARGE_READOUT_INIT);
1575
1576 break;
1577
1578 case AB8500_FG_DISCHARGE_INIT_RECOVERY:
1579 di->recovery_cnt = 0;
1580 di->recovery_needed = true;
1581 ab8500_fg_discharge_state_to(di,
1582 AB8500_FG_DISCHARGE_RECOVERY);
1583
1584 /* Intentional fallthrough */
1585
1586 case AB8500_FG_DISCHARGE_RECOVERY:
1587 sleep_time = di->bm->fg_params->recovery_sleep_timer;
1588
1589 /*
1590 * We should check the power consumption
1591 * If low, go to READOUT (after x min) or
1592 * RECOVERY_SLEEP if time left.
1593 * If high, go to READOUT
1594 */
1595 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1596
1597 if (ab8500_fg_is_low_curr(di, di->inst_curr)) {
1598 if (di->recovery_cnt >
1599 di->bm->fg_params->recovery_total_time) {
1600 di->fg_samples = SEC_TO_SAMPLE(
1601 di->bm->fg_params->accu_high_curr);
1602 ab8500_fg_coulomb_counter(di, true);
1603 ab8500_fg_discharge_state_to(di,
1604 AB8500_FG_DISCHARGE_READOUT);
1605 di->recovery_needed = false;
1606 } else {
1607 queue_delayed_work(di->fg_wq,
1608 &di->fg_periodic_work,
1609 sleep_time * HZ);
1610 }
1611 di->recovery_cnt += sleep_time;
1612 } else {
1613 di->fg_samples = SEC_TO_SAMPLE(
1614 di->bm->fg_params->accu_high_curr);
1615 ab8500_fg_coulomb_counter(di, true);
1616 ab8500_fg_discharge_state_to(di,
1617 AB8500_FG_DISCHARGE_READOUT);
1618 }
1619 break;
1620
1621 case AB8500_FG_DISCHARGE_READOUT_INIT:
1622 di->fg_samples = SEC_TO_SAMPLE(
1623 di->bm->fg_params->accu_high_curr);
1624 ab8500_fg_coulomb_counter(di, true);
1625 ab8500_fg_discharge_state_to(di,
1626 AB8500_FG_DISCHARGE_READOUT);
1627 break;
1628
1629 case AB8500_FG_DISCHARGE_READOUT:
1630 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1631
1632 if (ab8500_fg_is_low_curr(di, di->inst_curr)) {
1633 /* Detect mode change */
1634 if (di->high_curr_mode) {
1635 di->high_curr_mode = false;
1636 di->high_curr_cnt = 0;
1637 }
1638
1639 if (di->recovery_needed) {
1640 ab8500_fg_discharge_state_to(di,
1641 AB8500_FG_DISCHARGE_INIT_RECOVERY);
1642
1643 queue_delayed_work(di->fg_wq,
1644 &di->fg_periodic_work, 0);
1645
1646 break;
1647 }
1648
1649 ab8500_fg_calc_cap_discharge_voltage(di, true);
1650 } else {
1651 mutex_lock(&di->cc_lock);
1652 if (!di->flags.conv_done) {
1653 /* Wasn't the CC IRQ that got us here */
1654 mutex_unlock(&di->cc_lock);
1655 dev_dbg(di->dev, "%s CC conv not done\n",
1656 __func__);
1657
1658 break;
1659 }
1660 di->flags.conv_done = false;
1661 mutex_unlock(&di->cc_lock);
1662
1663 /* Detect mode change */
1664 if (!di->high_curr_mode) {
1665 di->high_curr_mode = true;
1666 di->high_curr_cnt = 0;
1667 }
1668
1669 di->high_curr_cnt +=
1670 di->bm->fg_params->accu_high_curr;
1671 if (di->high_curr_cnt >
1672 di->bm->fg_params->high_curr_time)
1673 di->recovery_needed = true;
1674
1675 ab8500_fg_calc_cap_discharge_fg(di);
1676 }
1677
1678 ab8500_fg_check_capacity_limits(di, false);
1679
1680 break;
1681
1682 case AB8500_FG_DISCHARGE_WAKEUP:
1683 ab8500_fg_calc_cap_discharge_voltage(di, true);
1684
1685 di->fg_samples = SEC_TO_SAMPLE(
1686 di->bm->fg_params->accu_high_curr);
1687 ab8500_fg_coulomb_counter(di, true);
1688 ab8500_fg_discharge_state_to(di,
1689 AB8500_FG_DISCHARGE_READOUT);
1690
1691 ab8500_fg_check_capacity_limits(di, false);
1692
1693 break;
1694
1695 default:
1696 break;
1697 }
1698}
1699
1700/**
1701 * ab8500_fg_algorithm_calibrate() - Internal columb counter offset calibration
1702 * @di: pointer to the ab8500_fg structure
1703 *
1704 */
1705static void ab8500_fg_algorithm_calibrate(struct ab8500_fg *di)
1706{
1707 int ret;
1708
1709 switch (di->calib_state) {
1710 case AB8500_FG_CALIB_INIT:
1711 dev_dbg(di->dev, "Calibration ongoing...\n");
1712
1713 ret = abx500_mask_and_set_register_interruptible(di->dev,
1714 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1715 CC_INT_CAL_N_AVG_MASK, CC_INT_CAL_SAMPLES_8);
1716 if (ret < 0)
1717 goto err;
1718
1719 ret = abx500_mask_and_set_register_interruptible(di->dev,
1720 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1721 CC_INTAVGOFFSET_ENA, CC_INTAVGOFFSET_ENA);
1722 if (ret < 0)
1723 goto err;
1724 di->calib_state = AB8500_FG_CALIB_WAIT;
1725 break;
1726 case AB8500_FG_CALIB_END:
1727 ret = abx500_mask_and_set_register_interruptible(di->dev,
1728 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1729 CC_MUXOFFSET, CC_MUXOFFSET);
1730 if (ret < 0)
1731 goto err;
1732 di->flags.calibrate = false;
1733 dev_dbg(di->dev, "Calibration done...\n");
1734 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1735 break;
1736 case AB8500_FG_CALIB_WAIT:
1737 dev_dbg(di->dev, "Calibration WFI\n");
1738 default:
1739 break;
1740 }
1741 return;
1742err:
1743 /* Something went wrong, don't calibrate then */
1744 dev_err(di->dev, "failed to calibrate the CC\n");
1745 di->flags.calibrate = false;
1746 di->calib_state = AB8500_FG_CALIB_INIT;
1747 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1748}
1749
1750/**
1751 * ab8500_fg_algorithm() - Entry point for the FG algorithm
1752 * @di: pointer to the ab8500_fg structure
1753 *
1754 * Entry point for the battery capacity calculation state machine
1755 */
1756static void ab8500_fg_algorithm(struct ab8500_fg *di)
1757{
1758 if (di->flags.calibrate)
1759 ab8500_fg_algorithm_calibrate(di);
1760 else {
1761 if (di->flags.charging)
1762 ab8500_fg_algorithm_charging(di);
1763 else
1764 ab8500_fg_algorithm_discharging(di);
1765 }
1766
1767 dev_dbg(di->dev, "[FG_DATA] %d %d %d %d %d %d %d %d %d %d "
1768 "%d %d %d %d %d %d %d\n",
1769 di->bat_cap.max_mah_design,
1770 di->bat_cap.max_mah,
1771 di->bat_cap.mah,
1772 di->bat_cap.permille,
1773 di->bat_cap.level,
1774 di->bat_cap.prev_mah,
1775 di->bat_cap.prev_percent,
1776 di->bat_cap.prev_level,
1777 di->vbat,
1778 di->inst_curr,
1779 di->avg_curr,
1780 di->accu_charge,
1781 di->flags.charging,
1782 di->charge_state,
1783 di->discharge_state,
1784 di->high_curr_mode,
1785 di->recovery_needed);
1786}
1787
1788/**
1789 * ab8500_fg_periodic_work() - Run the FG state machine periodically
1790 * @work: pointer to the work_struct structure
1791 *
1792 * Work queue function for periodic work
1793 */
1794static void ab8500_fg_periodic_work(struct work_struct *work)
1795{
1796 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1797 fg_periodic_work.work);
1798
1799 if (di->init_capacity) {
1800 /* Get an initial capacity calculation */
1801 ab8500_fg_calc_cap_discharge_voltage(di, true);
1802 ab8500_fg_check_capacity_limits(di, true);
1803 di->init_capacity = false;
1804
1805 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1806 } else if (di->flags.user_cap) {
1807 if (check_sysfs_capacity(di)) {
1808 ab8500_fg_check_capacity_limits(di, true);
1809 if (di->flags.charging)
1810 ab8500_fg_charge_state_to(di,
1811 AB8500_FG_CHARGE_INIT);
1812 else
1813 ab8500_fg_discharge_state_to(di,
1814 AB8500_FG_DISCHARGE_READOUT_INIT);
1815 }
1816 di->flags.user_cap = false;
1817 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1818 } else
1819 ab8500_fg_algorithm(di);
1820
1821}
1822
1823/**
1824 * ab8500_fg_check_hw_failure_work() - Check OVV_BAT condition
1825 * @work: pointer to the work_struct structure
1826 *
1827 * Work queue function for checking the OVV_BAT condition
1828 */
1829static void ab8500_fg_check_hw_failure_work(struct work_struct *work)
1830{
1831 int ret;
1832 u8 reg_value;
1833
1834 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1835 fg_check_hw_failure_work.work);
1836
1837 /*
1838 * If we have had a battery over-voltage situation,
1839 * check ovv-bit to see if it should be reset.
1840 */
1841 ret = abx500_get_register_interruptible(di->dev,
1842 AB8500_CHARGER, AB8500_CH_STAT_REG,
1843 ®_value);
1844 if (ret < 0) {
1845 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1846 return;
1847 }
1848 if ((reg_value & BATT_OVV) == BATT_OVV) {
1849 if (!di->flags.bat_ovv) {
1850 dev_dbg(di->dev, "Battery OVV\n");
1851 di->flags.bat_ovv = true;
1852 power_supply_changed(&di->fg_psy);
1853 }
1854 /* Not yet recovered from ovv, reschedule this test */
1855 queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work,
1856 HZ);
1857 } else {
1858 dev_dbg(di->dev, "Battery recovered from OVV\n");
1859 di->flags.bat_ovv = false;
1860 power_supply_changed(&di->fg_psy);
1861 }
1862}
1863
1864/**
1865 * ab8500_fg_low_bat_work() - Check LOW_BAT condition
1866 * @work: pointer to the work_struct structure
1867 *
1868 * Work queue function for checking the LOW_BAT condition
1869 */
1870static void ab8500_fg_low_bat_work(struct work_struct *work)
1871{
1872 int vbat;
1873
1874 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1875 fg_low_bat_work.work);
1876
1877 vbat = ab8500_fg_bat_voltage(di);
1878
1879 /* Check if LOW_BAT still fulfilled */
1880 if (vbat < di->bm->fg_params->lowbat_threshold) {
1881 /* Is it time to shut down? */
1882 if (di->low_bat_cnt < 1) {
1883 di->flags.low_bat = true;
1884 dev_warn(di->dev, "Shut down pending...\n");
1885 } else {
1886 /*
1887 * Else we need to re-schedule this check to be able to detect
1888 * if the voltage increases again during charging or
1889 * due to decreasing load.
1890 */
1891 di->low_bat_cnt--;
1892 dev_warn(di->dev, "Battery voltage still LOW\n");
1893 queue_delayed_work(di->fg_wq, &di->fg_low_bat_work,
1894 round_jiffies(LOW_BAT_CHECK_INTERVAL));
1895 }
1896 } else {
1897 di->flags.low_bat_delay = false;
1898 di->low_bat_cnt = 10;
1899 dev_warn(di->dev, "Battery voltage OK again\n");
1900 }
1901
1902 /* This is needed to dispatch LOW_BAT */
1903 ab8500_fg_check_capacity_limits(di, false);
1904}
1905
1906/**
1907 * ab8500_fg_battok_calc - calculate the bit pattern corresponding
1908 * to the target voltage.
1909 * @di: pointer to the ab8500_fg structure
1910 * @target target voltage
1911 *
1912 * Returns bit pattern closest to the target voltage
1913 * valid return values are 0-14. (0-BATT_OK_MAX_NR_INCREMENTS)
1914 */
1915
1916static int ab8500_fg_battok_calc(struct ab8500_fg *di, int target)
1917{
1918 if (target > BATT_OK_MIN +
1919 (BATT_OK_INCREMENT * BATT_OK_MAX_NR_INCREMENTS))
1920 return BATT_OK_MAX_NR_INCREMENTS;
1921 if (target < BATT_OK_MIN)
1922 return 0;
1923 return (target - BATT_OK_MIN) / BATT_OK_INCREMENT;
1924}
1925
1926/**
1927 * ab8500_fg_battok_init_hw_register - init battok levels
1928 * @di: pointer to the ab8500_fg structure
1929 *
1930 */
1931
1932static int ab8500_fg_battok_init_hw_register(struct ab8500_fg *di)
1933{
1934 int selected;
1935 int sel0;
1936 int sel1;
1937 int cbp_sel0;
1938 int cbp_sel1;
1939 int ret;
1940 int new_val;
1941
1942 sel0 = di->bm->fg_params->battok_falling_th_sel0;
1943 sel1 = di->bm->fg_params->battok_raising_th_sel1;
1944
1945 cbp_sel0 = ab8500_fg_battok_calc(di, sel0);
1946 cbp_sel1 = ab8500_fg_battok_calc(di, sel1);
1947
1948 selected = BATT_OK_MIN + cbp_sel0 * BATT_OK_INCREMENT;
1949
1950 if (selected != sel0)
1951 dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n",
1952 sel0, selected, cbp_sel0);
1953
1954 selected = BATT_OK_MIN + cbp_sel1 * BATT_OK_INCREMENT;
1955
1956 if (selected != sel1)
1957 dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n",
1958 sel1, selected, cbp_sel1);
1959
1960 new_val = cbp_sel0 | (cbp_sel1 << 4);
1961
1962 dev_dbg(di->dev, "using: %x %d %d\n", new_val, cbp_sel0, cbp_sel1);
1963 ret = abx500_set_register_interruptible(di->dev, AB8500_SYS_CTRL2_BLOCK,
1964 AB8500_BATT_OK_REG, new_val);
1965 return ret;
1966}
1967
1968/**
1969 * ab8500_fg_instant_work() - Run the FG state machine instantly
1970 * @work: pointer to the work_struct structure
1971 *
1972 * Work queue function for instant work
1973 */
1974static void ab8500_fg_instant_work(struct work_struct *work)
1975{
1976 struct ab8500_fg *di = container_of(work, struct ab8500_fg, fg_work);
1977
1978 ab8500_fg_algorithm(di);
1979}
1980
1981/**
1982 * ab8500_fg_cc_data_end_handler() - end of data conversion isr.
1983 * @irq: interrupt number
1984 * @_di: pointer to the ab8500_fg structure
1985 *
1986 * Returns IRQ status(IRQ_HANDLED)
1987 */
1988static irqreturn_t ab8500_fg_cc_data_end_handler(int irq, void *_di)
1989{
1990 struct ab8500_fg *di = _di;
1991 if (!di->nbr_cceoc_irq_cnt) {
1992 di->nbr_cceoc_irq_cnt++;
1993 complete(&di->ab8500_fg_started);
1994 } else {
1995 di->nbr_cceoc_irq_cnt = 0;
1996 complete(&di->ab8500_fg_complete);
1997 }
1998 return IRQ_HANDLED;
1999}
2000
2001/**
2002 * ab8500_fg_cc_int_calib_handler () - end of calibration isr.
2003 * @irq: interrupt number
2004 * @_di: pointer to the ab8500_fg structure
2005 *
2006 * Returns IRQ status(IRQ_HANDLED)
2007 */
2008static irqreturn_t ab8500_fg_cc_int_calib_handler(int irq, void *_di)
2009{
2010 struct ab8500_fg *di = _di;
2011 di->calib_state = AB8500_FG_CALIB_END;
2012 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2013 return IRQ_HANDLED;
2014}
2015
2016/**
2017 * ab8500_fg_cc_convend_handler() - isr to get battery avg current.
2018 * @irq: interrupt number
2019 * @_di: pointer to the ab8500_fg structure
2020 *
2021 * Returns IRQ status(IRQ_HANDLED)
2022 */
2023static irqreturn_t ab8500_fg_cc_convend_handler(int irq, void *_di)
2024{
2025 struct ab8500_fg *di = _di;
2026
2027 queue_work(di->fg_wq, &di->fg_acc_cur_work);
2028
2029 return IRQ_HANDLED;
2030}
2031
2032/**
2033 * ab8500_fg_batt_ovv_handler() - Battery OVV occured
2034 * @irq: interrupt number
2035 * @_di: pointer to the ab8500_fg structure
2036 *
2037 * Returns IRQ status(IRQ_HANDLED)
2038 */
2039static irqreturn_t ab8500_fg_batt_ovv_handler(int irq, void *_di)
2040{
2041 struct ab8500_fg *di = _di;
2042
2043 dev_dbg(di->dev, "Battery OVV\n");
2044
2045 /* Schedule a new HW failure check */
2046 queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work, 0);
2047
2048 return IRQ_HANDLED;
2049}
2050
2051/**
2052 * ab8500_fg_lowbatf_handler() - Battery voltage is below LOW threshold
2053 * @irq: interrupt number
2054 * @_di: pointer to the ab8500_fg structure
2055 *
2056 * Returns IRQ status(IRQ_HANDLED)
2057 */
2058static irqreturn_t ab8500_fg_lowbatf_handler(int irq, void *_di)
2059{
2060 struct ab8500_fg *di = _di;
2061
2062 /* Initiate handling in ab8500_fg_low_bat_work() if not already initiated. */
2063 if (!di->flags.low_bat_delay) {
2064 dev_warn(di->dev, "Battery voltage is below LOW threshold\n");
2065 di->flags.low_bat_delay = true;
2066 /*
2067 * Start a timer to check LOW_BAT again after some time
2068 * This is done to avoid shutdown on single voltage dips
2069 */
2070 queue_delayed_work(di->fg_wq, &di->fg_low_bat_work,
2071 round_jiffies(LOW_BAT_CHECK_INTERVAL));
2072 }
2073 return IRQ_HANDLED;
2074}
2075
2076/**
2077 * ab8500_fg_get_property() - get the fg properties
2078 * @psy: pointer to the power_supply structure
2079 * @psp: pointer to the power_supply_property structure
2080 * @val: pointer to the power_supply_propval union
2081 *
2082 * This function gets called when an application tries to get the
2083 * fg properties by reading the sysfs files.
2084 * voltage_now: battery voltage
2085 * current_now: battery instant current
2086 * current_avg: battery average current
2087 * charge_full_design: capacity where battery is considered full
2088 * charge_now: battery capacity in nAh
2089 * capacity: capacity in percent
2090 * capacity_level: capacity level
2091 *
2092 * Returns error code in case of failure else 0 on success
2093 */
2094static int ab8500_fg_get_property(struct power_supply *psy,
2095 enum power_supply_property psp,
2096 union power_supply_propval *val)
2097{
2098 struct ab8500_fg *di;
2099
2100 di = to_ab8500_fg_device_info(psy);
2101
2102 /*
2103 * If battery is identified as unknown and charging of unknown
2104 * batteries is disabled, we always report 100% capacity and
2105 * capacity level UNKNOWN, since we can't calculate
2106 * remaining capacity
2107 */
2108
2109 switch (psp) {
2110 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
2111 if (di->flags.bat_ovv)
2112 val->intval = BATT_OVV_VALUE * 1000;
2113 else
2114 val->intval = di->vbat * 1000;
2115 break;
2116 case POWER_SUPPLY_PROP_CURRENT_NOW:
2117 val->intval = di->inst_curr * 1000;
2118 break;
2119 case POWER_SUPPLY_PROP_CURRENT_AVG:
2120 val->intval = di->avg_curr * 1000;
2121 break;
2122 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
2123 val->intval = ab8500_fg_convert_mah_to_uwh(di,
2124 di->bat_cap.max_mah_design);
2125 break;
2126 case POWER_SUPPLY_PROP_ENERGY_FULL:
2127 val->intval = ab8500_fg_convert_mah_to_uwh(di,
2128 di->bat_cap.max_mah);
2129 break;
2130 case POWER_SUPPLY_PROP_ENERGY_NOW:
2131 if (di->flags.batt_unknown && !di->bm->chg_unknown_bat &&
2132 di->flags.batt_id_received)
2133 val->intval = ab8500_fg_convert_mah_to_uwh(di,
2134 di->bat_cap.max_mah);
2135 else
2136 val->intval = ab8500_fg_convert_mah_to_uwh(di,
2137 di->bat_cap.prev_mah);
2138 break;
2139 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
2140 val->intval = di->bat_cap.max_mah_design;
2141 break;
2142 case POWER_SUPPLY_PROP_CHARGE_FULL:
2143 val->intval = di->bat_cap.max_mah;
2144 break;
2145 case POWER_SUPPLY_PROP_CHARGE_NOW:
2146 if (di->flags.batt_unknown && !di->bm->chg_unknown_bat &&
2147 di->flags.batt_id_received)
2148 val->intval = di->bat_cap.max_mah;
2149 else
2150 val->intval = di->bat_cap.prev_mah;
2151 break;
2152 case POWER_SUPPLY_PROP_CAPACITY:
2153 if (di->flags.batt_unknown && !di->bm->chg_unknown_bat &&
2154 di->flags.batt_id_received)
2155 val->intval = 100;
2156 else
2157 val->intval = di->bat_cap.prev_percent;
2158 break;
2159 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
2160 if (di->flags.batt_unknown && !di->bm->chg_unknown_bat &&
2161 di->flags.batt_id_received)
2162 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
2163 else
2164 val->intval = di->bat_cap.prev_level;
2165 break;
2166 default:
2167 return -EINVAL;
2168 }
2169 return 0;
2170}
2171
2172static int ab8500_fg_get_ext_psy_data(struct device *dev, void *data)
2173{
2174 struct power_supply *psy;
2175 struct power_supply *ext;
2176 struct ab8500_fg *di;
2177 union power_supply_propval ret;
2178 int i, j;
2179 bool psy_found = false;
2180
2181 psy = (struct power_supply *)data;
2182 ext = dev_get_drvdata(dev);
2183 di = to_ab8500_fg_device_info(psy);
2184
2185 /*
2186 * For all psy where the name of your driver
2187 * appears in any supplied_to
2188 */
2189 for (i = 0; i < ext->num_supplicants; i++) {
2190 if (!strcmp(ext->supplied_to[i], psy->name))
2191 psy_found = true;
2192 }
2193
2194 if (!psy_found)
2195 return 0;
2196
2197 /* Go through all properties for the psy */
2198 for (j = 0; j < ext->num_properties; j++) {
2199 enum power_supply_property prop;
2200 prop = ext->properties[j];
2201
2202 if (ext->get_property(ext, prop, &ret))
2203 continue;
2204
2205 switch (prop) {
2206 case POWER_SUPPLY_PROP_STATUS:
2207 switch (ext->type) {
2208 case POWER_SUPPLY_TYPE_BATTERY:
2209 switch (ret.intval) {
2210 case POWER_SUPPLY_STATUS_UNKNOWN:
2211 case POWER_SUPPLY_STATUS_DISCHARGING:
2212 case POWER_SUPPLY_STATUS_NOT_CHARGING:
2213 if (!di->flags.charging)
2214 break;
2215 di->flags.charging = false;
2216 di->flags.fully_charged = false;
2217 if (di->bm->capacity_scaling)
2218 ab8500_fg_update_cap_scalers(di);
2219 queue_work(di->fg_wq, &di->fg_work);
2220 break;
2221 case POWER_SUPPLY_STATUS_FULL:
2222 if (di->flags.fully_charged)
2223 break;
2224 di->flags.fully_charged = true;
2225 di->flags.force_full = true;
2226 /* Save current capacity as maximum */
2227 di->bat_cap.max_mah = di->bat_cap.mah;
2228 queue_work(di->fg_wq, &di->fg_work);
2229 break;
2230 case POWER_SUPPLY_STATUS_CHARGING:
2231 if (di->flags.charging &&
2232 !di->flags.fully_charged)
2233 break;
2234 di->flags.charging = true;
2235 di->flags.fully_charged = false;
2236 if (di->bm->capacity_scaling)
2237 ab8500_fg_update_cap_scalers(di);
2238 queue_work(di->fg_wq, &di->fg_work);
2239 break;
2240 };
2241 default:
2242 break;
2243 };
2244 break;
2245 case POWER_SUPPLY_PROP_TECHNOLOGY:
2246 switch (ext->type) {
2247 case POWER_SUPPLY_TYPE_BATTERY:
2248 if (!di->flags.batt_id_received &&
2249 di->bm->batt_id != BATTERY_UNKNOWN) {
2250 const struct abx500_battery_type *b;
2251
2252 b = &(di->bm->bat_type[di->bm->batt_id]);
2253
2254 di->flags.batt_id_received = true;
2255
2256 di->bat_cap.max_mah_design =
2257 MILLI_TO_MICRO *
2258 b->charge_full_design;
2259
2260 di->bat_cap.max_mah =
2261 di->bat_cap.max_mah_design;
2262
2263 di->vbat_nom = b->nominal_voltage;
2264 }
2265
2266 if (ret.intval)
2267 di->flags.batt_unknown = false;
2268 else
2269 di->flags.batt_unknown = true;
2270 break;
2271 default:
2272 break;
2273 }
2274 break;
2275 case POWER_SUPPLY_PROP_TEMP:
2276 switch (ext->type) {
2277 case POWER_SUPPLY_TYPE_BATTERY:
2278 if (di->flags.batt_id_received)
2279 di->bat_temp = ret.intval;
2280 break;
2281 default:
2282 break;
2283 }
2284 break;
2285 default:
2286 break;
2287 }
2288 }
2289 return 0;
2290}
2291
2292/**
2293 * ab8500_fg_init_hw_registers() - Set up FG related registers
2294 * @di: pointer to the ab8500_fg structure
2295 *
2296 * Set up battery OVV, low battery voltage registers
2297 */
2298static int ab8500_fg_init_hw_registers(struct ab8500_fg *di)
2299{
2300 int ret;
2301
2302 /* Set VBAT OVV threshold */
2303 ret = abx500_mask_and_set_register_interruptible(di->dev,
2304 AB8500_CHARGER,
2305 AB8500_BATT_OVV,
2306 BATT_OVV_TH_4P75,
2307 BATT_OVV_TH_4P75);
2308 if (ret) {
2309 dev_err(di->dev, "failed to set BATT_OVV\n");
2310 goto out;
2311 }
2312
2313 /* Enable VBAT OVV detection */
2314 ret = abx500_mask_and_set_register_interruptible(di->dev,
2315 AB8500_CHARGER,
2316 AB8500_BATT_OVV,
2317 BATT_OVV_ENA,
2318 BATT_OVV_ENA);
2319 if (ret) {
2320 dev_err(di->dev, "failed to enable BATT_OVV\n");
2321 goto out;
2322 }
2323
2324 /* Low Battery Voltage */
2325 ret = abx500_set_register_interruptible(di->dev,
2326 AB8500_SYS_CTRL2_BLOCK,
2327 AB8500_LOW_BAT_REG,
2328 ab8500_volt_to_regval(
2329 di->bm->fg_params->lowbat_threshold) << 1 |
2330 LOW_BAT_ENABLE);
2331 if (ret) {
2332 dev_err(di->dev, "%s write failed\n", __func__);
2333 goto out;
2334 }
2335
2336 /* Battery OK threshold */
2337 ret = ab8500_fg_battok_init_hw_register(di);
2338 if (ret) {
2339 dev_err(di->dev, "BattOk init write failed.\n");
2340 goto out;
2341 }
2342
2343 if (((is_ab8505(di->parent) || is_ab9540(di->parent)) &&
2344 abx500_get_chip_id(di->dev) >= AB8500_CUT2P0)
2345 || is_ab8540(di->parent)) {
2346 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2347 AB8505_RTC_PCUT_MAX_TIME_REG, di->bm->fg_params->pcut_max_time);
2348
2349 if (ret) {
2350 dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_MAX_TIME_REG\n", __func__);
2351 goto out;
2352 };
2353
2354 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2355 AB8505_RTC_PCUT_FLAG_TIME_REG, di->bm->fg_params->pcut_flag_time);
2356
2357 if (ret) {
2358 dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_FLAG_TIME_REG\n", __func__);
2359 goto out;
2360 };
2361
2362 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2363 AB8505_RTC_PCUT_RESTART_REG, di->bm->fg_params->pcut_max_restart);
2364
2365 if (ret) {
2366 dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_RESTART_REG\n", __func__);
2367 goto out;
2368 };
2369
2370 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2371 AB8505_RTC_PCUT_DEBOUNCE_REG, di->bm->fg_params->pcut_debounce_time);
2372
2373 if (ret) {
2374 dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_DEBOUNCE_REG\n", __func__);
2375 goto out;
2376 };
2377
2378 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2379 AB8505_RTC_PCUT_CTL_STATUS_REG, di->bm->fg_params->pcut_enable);
2380
2381 if (ret) {
2382 dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_CTL_STATUS_REG\n", __func__);
2383 goto out;
2384 };
2385 }
2386out:
2387 return ret;
2388}
2389
2390/**
2391 * ab8500_fg_external_power_changed() - callback for power supply changes
2392 * @psy: pointer to the structure power_supply
2393 *
2394 * This function is the entry point of the pointer external_power_changed
2395 * of the structure power_supply.
2396 * This function gets executed when there is a change in any external power
2397 * supply that this driver needs to be notified of.
2398 */
2399static void ab8500_fg_external_power_changed(struct power_supply *psy)
2400{
2401 struct ab8500_fg *di = to_ab8500_fg_device_info(psy);
2402
2403 class_for_each_device(power_supply_class, NULL,
2404 &di->fg_psy, ab8500_fg_get_ext_psy_data);
2405}
2406
2407/**
2408 * abab8500_fg_reinit_work() - work to reset the FG algorithm
2409 * @work: pointer to the work_struct structure
2410 *
2411 * Used to reset the current battery capacity to be able to
2412 * retrigger a new voltage base capacity calculation. For
2413 * test and verification purpose.
2414 */
2415static void ab8500_fg_reinit_work(struct work_struct *work)
2416{
2417 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
2418 fg_reinit_work.work);
2419
2420 if (di->flags.calibrate == false) {
2421 dev_dbg(di->dev, "Resetting FG state machine to init.\n");
2422 ab8500_fg_clear_cap_samples(di);
2423 ab8500_fg_calc_cap_discharge_voltage(di, true);
2424 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
2425 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT);
2426 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2427
2428 } else {
2429 dev_err(di->dev, "Residual offset calibration ongoing "
2430 "retrying..\n");
2431 /* Wait one second until next try*/
2432 queue_delayed_work(di->fg_wq, &di->fg_reinit_work,
2433 round_jiffies(1));
2434 }
2435}
2436
2437/**
2438 * ab8500_fg_reinit() - forces FG algorithm to reinitialize with current values
2439 *
2440 * This function can be used to force the FG algorithm to recalculate a new
2441 * voltage based battery capacity.
2442 */
2443void ab8500_fg_reinit(void)
2444{
2445 struct ab8500_fg *di = ab8500_fg_get();
2446 /* User won't be notified if a null pointer returned. */
2447 if (di != NULL)
2448 queue_delayed_work(di->fg_wq, &di->fg_reinit_work, 0);
2449}
2450
2451/* Exposure to the sysfs interface */
2452
2453struct ab8500_fg_sysfs_entry {
2454 struct attribute attr;
2455 ssize_t (*show)(struct ab8500_fg *, char *);
2456 ssize_t (*store)(struct ab8500_fg *, const char *, size_t);
2457};
2458
2459static ssize_t charge_full_show(struct ab8500_fg *di, char *buf)
2460{
2461 return sprintf(buf, "%d\n", di->bat_cap.max_mah);
2462}
2463
2464static ssize_t charge_full_store(struct ab8500_fg *di, const char *buf,
2465 size_t count)
2466{
2467 unsigned long charge_full;
2468 ssize_t ret;
2469
2470 ret = kstrtoul(buf, 10, &charge_full);
2471
2472 dev_dbg(di->dev, "Ret %zd charge_full %lu", ret, charge_full);
2473
2474 if (!ret) {
2475 di->bat_cap.max_mah = (int) charge_full;
2476 ret = count;
2477 }
2478 return ret;
2479}
2480
2481static ssize_t charge_now_show(struct ab8500_fg *di, char *buf)
2482{
2483 return sprintf(buf, "%d\n", di->bat_cap.prev_mah);
2484}
2485
2486static ssize_t charge_now_store(struct ab8500_fg *di, const char *buf,
2487 size_t count)
2488{
2489 unsigned long charge_now;
2490 ssize_t ret;
2491
2492 ret = kstrtoul(buf, 10, &charge_now);
2493
2494 dev_dbg(di->dev, "Ret %zd charge_now %lu was %d",
2495 ret, charge_now, di->bat_cap.prev_mah);
2496
2497 if (!ret) {
2498 di->bat_cap.user_mah = (int) charge_now;
2499 di->flags.user_cap = true;
2500 ret = count;
2501 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2502 }
2503 return ret;
2504}
2505
2506static struct ab8500_fg_sysfs_entry charge_full_attr =
2507 __ATTR(charge_full, 0644, charge_full_show, charge_full_store);
2508
2509static struct ab8500_fg_sysfs_entry charge_now_attr =
2510 __ATTR(charge_now, 0644, charge_now_show, charge_now_store);
2511
2512static ssize_t
2513ab8500_fg_show(struct kobject *kobj, struct attribute *attr, char *buf)
2514{
2515 struct ab8500_fg_sysfs_entry *entry;
2516 struct ab8500_fg *di;
2517
2518 entry = container_of(attr, struct ab8500_fg_sysfs_entry, attr);
2519 di = container_of(kobj, struct ab8500_fg, fg_kobject);
2520
2521 if (!entry->show)
2522 return -EIO;
2523
2524 return entry->show(di, buf);
2525}
2526static ssize_t
2527ab8500_fg_store(struct kobject *kobj, struct attribute *attr, const char *buf,
2528 size_t count)
2529{
2530 struct ab8500_fg_sysfs_entry *entry;
2531 struct ab8500_fg *di;
2532
2533 entry = container_of(attr, struct ab8500_fg_sysfs_entry, attr);
2534 di = container_of(kobj, struct ab8500_fg, fg_kobject);
2535
2536 if (!entry->store)
2537 return -EIO;
2538
2539 return entry->store(di, buf, count);
2540}
2541
2542static const struct sysfs_ops ab8500_fg_sysfs_ops = {
2543 .show = ab8500_fg_show,
2544 .store = ab8500_fg_store,
2545};
2546
2547static struct attribute *ab8500_fg_attrs[] = {
2548 &charge_full_attr.attr,
2549 &charge_now_attr.attr,
2550 NULL,
2551};
2552
2553static struct kobj_type ab8500_fg_ktype = {
2554 .sysfs_ops = &ab8500_fg_sysfs_ops,
2555 .default_attrs = ab8500_fg_attrs,
2556};
2557
2558/**
2559 * ab8500_chargalg_sysfs_exit() - de-init of sysfs entry
2560 * @di: pointer to the struct ab8500_chargalg
2561 *
2562 * This function removes the entry in sysfs.
2563 */
2564static void ab8500_fg_sysfs_exit(struct ab8500_fg *di)
2565{
2566 kobject_del(&di->fg_kobject);
2567}
2568
2569/**
2570 * ab8500_chargalg_sysfs_init() - init of sysfs entry
2571 * @di: pointer to the struct ab8500_chargalg
2572 *
2573 * This function adds an entry in sysfs.
2574 * Returns error code in case of failure else 0(on success)
2575 */
2576static int ab8500_fg_sysfs_init(struct ab8500_fg *di)
2577{
2578 int ret = 0;
2579
2580 ret = kobject_init_and_add(&di->fg_kobject,
2581 &ab8500_fg_ktype,
2582 NULL, "battery");
2583 if (ret < 0)
2584 dev_err(di->dev, "failed to create sysfs entry\n");
2585
2586 return ret;
2587}
2588
2589static ssize_t ab8505_powercut_flagtime_read(struct device *dev,
2590 struct device_attribute *attr,
2591 char *buf)
2592{
2593 int ret;
2594 u8 reg_value;
2595 struct power_supply *psy = dev_get_drvdata(dev);
2596 struct ab8500_fg *di;
2597
2598 di = to_ab8500_fg_device_info(psy);
2599
2600 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2601 AB8505_RTC_PCUT_FLAG_TIME_REG, ®_value);
2602
2603 if (ret < 0) {
2604 dev_err(dev, "Failed to read AB8505_RTC_PCUT_FLAG_TIME_REG\n");
2605 goto fail;
2606 }
2607
2608 return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7F));
2609
2610fail:
2611 return ret;
2612}
2613
2614static ssize_t ab8505_powercut_flagtime_write(struct device *dev,
2615 struct device_attribute *attr,
2616 const char *buf, size_t count)
2617{
2618 int ret;
2619 long unsigned reg_value;
2620 struct power_supply *psy = dev_get_drvdata(dev);
2621 struct ab8500_fg *di;
2622
2623 di = to_ab8500_fg_device_info(psy);
2624
2625 reg_value = simple_strtoul(buf, NULL, 10);
2626
2627 if (reg_value > 0x7F) {
2628 dev_err(dev, "Incorrect parameter, echo 0 (1.98s) - 127 (15.625ms) for flagtime\n");
2629 goto fail;
2630 }
2631
2632 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2633 AB8505_RTC_PCUT_FLAG_TIME_REG, (u8)reg_value);
2634
2635 if (ret < 0)
2636 dev_err(dev, "Failed to set AB8505_RTC_PCUT_FLAG_TIME_REG\n");
2637
2638fail:
2639 return count;
2640}
2641
2642static ssize_t ab8505_powercut_maxtime_read(struct device *dev,
2643 struct device_attribute *attr,
2644 char *buf)
2645{
2646 int ret;
2647 u8 reg_value;
2648 struct power_supply *psy = dev_get_drvdata(dev);
2649 struct ab8500_fg *di;
2650
2651 di = to_ab8500_fg_device_info(psy);
2652
2653 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2654 AB8505_RTC_PCUT_MAX_TIME_REG, ®_value);
2655
2656 if (ret < 0) {
2657 dev_err(dev, "Failed to read AB8505_RTC_PCUT_MAX_TIME_REG\n");
2658 goto fail;
2659 }
2660
2661 return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7F));
2662
2663fail:
2664 return ret;
2665
2666}
2667
2668static ssize_t ab8505_powercut_maxtime_write(struct device *dev,
2669 struct device_attribute *attr,
2670 const char *buf, size_t count)
2671{
2672 int ret;
2673 int reg_value;
2674 struct power_supply *psy = dev_get_drvdata(dev);
2675 struct ab8500_fg *di;
2676
2677 di = to_ab8500_fg_device_info(psy);
2678
2679 reg_value = simple_strtoul(buf, NULL, 10);
2680 if (reg_value > 0x7F) {
2681 dev_err(dev, "Incorrect parameter, echo 0 (0.0s) - 127 (1.98s) for maxtime\n");
2682 goto fail;
2683 }
2684
2685 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2686 AB8505_RTC_PCUT_MAX_TIME_REG, (u8)reg_value);
2687
2688 if (ret < 0)
2689 dev_err(dev, "Failed to set AB8505_RTC_PCUT_MAX_TIME_REG\n");
2690
2691fail:
2692 return count;
2693}
2694
2695static ssize_t ab8505_powercut_restart_read(struct device *dev,
2696 struct device_attribute *attr,
2697 char *buf)
2698{
2699 int ret;
2700 u8 reg_value;
2701 struct power_supply *psy = dev_get_drvdata(dev);
2702 struct ab8500_fg *di;
2703
2704 di = to_ab8500_fg_device_info(psy);
2705
2706 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2707 AB8505_RTC_PCUT_RESTART_REG, ®_value);
2708
2709 if (ret < 0) {
2710 dev_err(dev, "Failed to read AB8505_RTC_PCUT_RESTART_REG\n");
2711 goto fail;
2712 }
2713
2714 return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0xF));
2715
2716fail:
2717 return ret;
2718}
2719
2720static ssize_t ab8505_powercut_restart_write(struct device *dev,
2721 struct device_attribute *attr,
2722 const char *buf, size_t count)
2723{
2724 int ret;
2725 int reg_value;
2726 struct power_supply *psy = dev_get_drvdata(dev);
2727 struct ab8500_fg *di;
2728
2729 di = to_ab8500_fg_device_info(psy);
2730
2731 reg_value = simple_strtoul(buf, NULL, 10);
2732 if (reg_value > 0xF) {
2733 dev_err(dev, "Incorrect parameter, echo 0 - 15 for number of restart\n");
2734 goto fail;
2735 }
2736
2737 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2738 AB8505_RTC_PCUT_RESTART_REG, (u8)reg_value);
2739
2740 if (ret < 0)
2741 dev_err(dev, "Failed to set AB8505_RTC_PCUT_RESTART_REG\n");
2742
2743fail:
2744 return count;
2745
2746}
2747
2748static ssize_t ab8505_powercut_timer_read(struct device *dev,
2749 struct device_attribute *attr,
2750 char *buf)
2751{
2752 int ret;
2753 u8 reg_value;
2754 struct power_supply *psy = dev_get_drvdata(dev);
2755 struct ab8500_fg *di;
2756
2757 di = to_ab8500_fg_device_info(psy);
2758
2759 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2760 AB8505_RTC_PCUT_TIME_REG, ®_value);
2761
2762 if (ret < 0) {
2763 dev_err(dev, "Failed to read AB8505_RTC_PCUT_TIME_REG\n");
2764 goto fail;
2765 }
2766
2767 return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7F));
2768
2769fail:
2770 return ret;
2771}
2772
2773static ssize_t ab8505_powercut_restart_counter_read(struct device *dev,
2774 struct device_attribute *attr,
2775 char *buf)
2776{
2777 int ret;
2778 u8 reg_value;
2779 struct power_supply *psy = dev_get_drvdata(dev);
2780 struct ab8500_fg *di;
2781
2782 di = to_ab8500_fg_device_info(psy);
2783
2784 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2785 AB8505_RTC_PCUT_RESTART_REG, ®_value);
2786
2787 if (ret < 0) {
2788 dev_err(dev, "Failed to read AB8505_RTC_PCUT_RESTART_REG\n");
2789 goto fail;
2790 }
2791
2792 return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0xF0) >> 4);
2793
2794fail:
2795 return ret;
2796}
2797
2798static ssize_t ab8505_powercut_read(struct device *dev,
2799 struct device_attribute *attr,
2800 char *buf)
2801{
2802 int ret;
2803 u8 reg_value;
2804 struct power_supply *psy = dev_get_drvdata(dev);
2805 struct ab8500_fg *di;
2806
2807 di = to_ab8500_fg_device_info(psy);
2808
2809 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2810 AB8505_RTC_PCUT_CTL_STATUS_REG, ®_value);
2811
2812 if (ret < 0)
2813 goto fail;
2814
2815 return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x1));
2816
2817fail:
2818 return ret;
2819}
2820
2821static ssize_t ab8505_powercut_write(struct device *dev,
2822 struct device_attribute *attr,
2823 const char *buf, size_t count)
2824{
2825 int ret;
2826 int reg_value;
2827 struct power_supply *psy = dev_get_drvdata(dev);
2828 struct ab8500_fg *di;
2829
2830 di = to_ab8500_fg_device_info(psy);
2831
2832 reg_value = simple_strtoul(buf, NULL, 10);
2833 if (reg_value > 0x1) {
2834 dev_err(dev, "Incorrect parameter, echo 0/1 to disable/enable Pcut feature\n");
2835 goto fail;
2836 }
2837
2838 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2839 AB8505_RTC_PCUT_CTL_STATUS_REG, (u8)reg_value);
2840
2841 if (ret < 0)
2842 dev_err(dev, "Failed to set AB8505_RTC_PCUT_CTL_STATUS_REG\n");
2843
2844fail:
2845 return count;
2846}
2847
2848static ssize_t ab8505_powercut_flag_read(struct device *dev,
2849 struct device_attribute *attr,
2850 char *buf)
2851{
2852
2853 int ret;
2854 u8 reg_value;
2855 struct power_supply *psy = dev_get_drvdata(dev);
2856 struct ab8500_fg *di;
2857
2858 di = to_ab8500_fg_device_info(psy);
2859
2860 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2861 AB8505_RTC_PCUT_CTL_STATUS_REG, ®_value);
2862
2863 if (ret < 0) {
2864 dev_err(dev, "Failed to read AB8505_RTC_PCUT_CTL_STATUS_REG\n");
2865 goto fail;
2866 }
2867
2868 return scnprintf(buf, PAGE_SIZE, "%d\n", ((reg_value & 0x10) >> 4));
2869
2870fail:
2871 return ret;
2872}
2873
2874static ssize_t ab8505_powercut_debounce_read(struct device *dev,
2875 struct device_attribute *attr,
2876 char *buf)
2877{
2878 int ret;
2879 u8 reg_value;
2880 struct power_supply *psy = dev_get_drvdata(dev);
2881 struct ab8500_fg *di;
2882
2883 di = to_ab8500_fg_device_info(psy);
2884
2885 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2886 AB8505_RTC_PCUT_DEBOUNCE_REG, ®_value);
2887
2888 if (ret < 0) {
2889 dev_err(dev, "Failed to read AB8505_RTC_PCUT_DEBOUNCE_REG\n");
2890 goto fail;
2891 }
2892
2893 return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7));
2894
2895fail:
2896 return ret;
2897}
2898
2899static ssize_t ab8505_powercut_debounce_write(struct device *dev,
2900 struct device_attribute *attr,
2901 const char *buf, size_t count)
2902{
2903 int ret;
2904 int reg_value;
2905 struct power_supply *psy = dev_get_drvdata(dev);
2906 struct ab8500_fg *di;
2907
2908 di = to_ab8500_fg_device_info(psy);
2909
2910 reg_value = simple_strtoul(buf, NULL, 10);
2911 if (reg_value > 0x7) {
2912 dev_err(dev, "Incorrect parameter, echo 0 to 7 for debounce setting\n");
2913 goto fail;
2914 }
2915
2916 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2917 AB8505_RTC_PCUT_DEBOUNCE_REG, (u8)reg_value);
2918
2919 if (ret < 0)
2920 dev_err(dev, "Failed to set AB8505_RTC_PCUT_DEBOUNCE_REG\n");
2921
2922fail:
2923 return count;
2924}
2925
2926static ssize_t ab8505_powercut_enable_status_read(struct device *dev,
2927 struct device_attribute *attr,
2928 char *buf)
2929{
2930 int ret;
2931 u8 reg_value;
2932 struct power_supply *psy = dev_get_drvdata(dev);
2933 struct ab8500_fg *di;
2934
2935 di = to_ab8500_fg_device_info(psy);
2936
2937 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2938 AB8505_RTC_PCUT_CTL_STATUS_REG, ®_value);
2939
2940 if (ret < 0) {
2941 dev_err(dev, "Failed to read AB8505_RTC_PCUT_CTL_STATUS_REG\n");
2942 goto fail;
2943 }
2944
2945 return scnprintf(buf, PAGE_SIZE, "%d\n", ((reg_value & 0x20) >> 5));
2946
2947fail:
2948 return ret;
2949}
2950
2951static struct device_attribute ab8505_fg_sysfs_psy_attrs[] = {
2952 __ATTR(powercut_flagtime, (S_IRUGO | S_IWUSR | S_IWGRP),
2953 ab8505_powercut_flagtime_read, ab8505_powercut_flagtime_write),
2954 __ATTR(powercut_maxtime, (S_IRUGO | S_IWUSR | S_IWGRP),
2955 ab8505_powercut_maxtime_read, ab8505_powercut_maxtime_write),
2956 __ATTR(powercut_restart_max, (S_IRUGO | S_IWUSR | S_IWGRP),
2957 ab8505_powercut_restart_read, ab8505_powercut_restart_write),
2958 __ATTR(powercut_timer, S_IRUGO, ab8505_powercut_timer_read, NULL),
2959 __ATTR(powercut_restart_counter, S_IRUGO,
2960 ab8505_powercut_restart_counter_read, NULL),
2961 __ATTR(powercut_enable, (S_IRUGO | S_IWUSR | S_IWGRP),
2962 ab8505_powercut_read, ab8505_powercut_write),
2963 __ATTR(powercut_flag, S_IRUGO, ab8505_powercut_flag_read, NULL),
2964 __ATTR(powercut_debounce_time, (S_IRUGO | S_IWUSR | S_IWGRP),
2965 ab8505_powercut_debounce_read, ab8505_powercut_debounce_write),
2966 __ATTR(powercut_enable_status, S_IRUGO,
2967 ab8505_powercut_enable_status_read, NULL),
2968};
2969
2970static int ab8500_fg_sysfs_psy_create_attrs(struct device *dev)
2971{
2972 unsigned int i, j;
2973 struct power_supply *psy = dev_get_drvdata(dev);
2974 struct ab8500_fg *di;
2975
2976 di = to_ab8500_fg_device_info(psy);
2977
2978 if (((is_ab8505(di->parent) || is_ab9540(di->parent)) &&
2979 abx500_get_chip_id(dev->parent) >= AB8500_CUT2P0)
2980 || is_ab8540(di->parent)) {
2981 for (j = 0; j < ARRAY_SIZE(ab8505_fg_sysfs_psy_attrs); j++)
2982 if (device_create_file(dev, &ab8505_fg_sysfs_psy_attrs[j]))
2983 goto sysfs_psy_create_attrs_failed_ab8505;
2984 }
2985 return 0;
2986sysfs_psy_create_attrs_failed_ab8505:
2987 dev_err(dev, "Failed creating sysfs psy attrs for ab8505.\n");
2988 while (j--)
2989 device_remove_file(dev, &ab8505_fg_sysfs_psy_attrs[i]);
2990
2991 return -EIO;
2992}
2993
2994static void ab8500_fg_sysfs_psy_remove_attrs(struct device *dev)
2995{
2996 unsigned int i;
2997 struct power_supply *psy = dev_get_drvdata(dev);
2998 struct ab8500_fg *di;
2999
3000 di = to_ab8500_fg_device_info(psy);
3001
3002 if (((is_ab8505(di->parent) || is_ab9540(di->parent)) &&
3003 abx500_get_chip_id(dev->parent) >= AB8500_CUT2P0)
3004 || is_ab8540(di->parent)) {
3005 for (i = 0; i < ARRAY_SIZE(ab8505_fg_sysfs_psy_attrs); i++)
3006 (void)device_remove_file(dev, &ab8505_fg_sysfs_psy_attrs[i]);
3007 }
3008}
3009
3010/* Exposure to the sysfs interface <<END>> */
3011
3012#if defined(CONFIG_PM)
3013static int ab8500_fg_resume(struct platform_device *pdev)
3014{
3015 struct ab8500_fg *di = platform_get_drvdata(pdev);
3016
3017 /*
3018 * Change state if we're not charging. If we're charging we will wake
3019 * up on the FG IRQ
3020 */
3021 if (!di->flags.charging) {
3022 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_WAKEUP);
3023 queue_work(di->fg_wq, &di->fg_work);
3024 }
3025
3026 return 0;
3027}
3028
3029static int ab8500_fg_suspend(struct platform_device *pdev,
3030 pm_message_t state)
3031{
3032 struct ab8500_fg *di = platform_get_drvdata(pdev);
3033
3034 flush_delayed_work(&di->fg_periodic_work);
3035 flush_work(&di->fg_work);
3036 flush_work(&di->fg_acc_cur_work);
3037 flush_delayed_work(&di->fg_reinit_work);
3038 flush_delayed_work(&di->fg_low_bat_work);
3039 flush_delayed_work(&di->fg_check_hw_failure_work);
3040
3041 /*
3042 * If the FG is enabled we will disable it before going to suspend
3043 * only if we're not charging
3044 */
3045 if (di->flags.fg_enabled && !di->flags.charging)
3046 ab8500_fg_coulomb_counter(di, false);
3047
3048 return 0;
3049}
3050#else
3051#define ab8500_fg_suspend NULL
3052#define ab8500_fg_resume NULL
3053#endif
3054
3055static int ab8500_fg_remove(struct platform_device *pdev)
3056{
3057 int ret = 0;
3058 struct ab8500_fg *di = platform_get_drvdata(pdev);
3059
3060 list_del(&di->node);
3061
3062 /* Disable coulomb counter */
3063 ret = ab8500_fg_coulomb_counter(di, false);
3064 if (ret)
3065 dev_err(di->dev, "failed to disable coulomb counter\n");
3066
3067 destroy_workqueue(di->fg_wq);
3068 ab8500_fg_sysfs_exit(di);
3069
3070 flush_scheduled_work();
3071 ab8500_fg_sysfs_psy_remove_attrs(di->fg_psy.dev);
3072 power_supply_unregister(&di->fg_psy);
3073 return ret;
3074}
3075
3076/* ab8500 fg driver interrupts and their respective isr */
3077static struct ab8500_fg_interrupts ab8500_fg_irq[] = {
3078 {"NCONV_ACCU", ab8500_fg_cc_convend_handler},
3079 {"BATT_OVV", ab8500_fg_batt_ovv_handler},
3080 {"LOW_BAT_F", ab8500_fg_lowbatf_handler},
3081 {"CC_INT_CALIB", ab8500_fg_cc_int_calib_handler},
3082 {"CCEOC", ab8500_fg_cc_data_end_handler},
3083};
3084
3085static char *supply_interface[] = {
3086 "ab8500_chargalg",
3087 "ab8500_usb",
3088};
3089
3090static int ab8500_fg_probe(struct platform_device *pdev)
3091{
3092 struct device_node *np = pdev->dev.of_node;
3093 struct abx500_bm_data *plat = pdev->dev.platform_data;
3094 struct ab8500_fg *di;
3095 int i, irq;
3096 int ret = 0;
3097
3098 di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
3099 if (!di) {
3100 dev_err(&pdev->dev, "%s no mem for ab8500_fg\n", __func__);
3101 return -ENOMEM;
3102 }
3103
3104 if (!plat) {
3105 dev_err(&pdev->dev, "no battery management data supplied\n");
3106 return -EINVAL;
3107 }
3108 di->bm = plat;
3109
3110 if (np) {
3111 ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
3112 if (ret) {
3113 dev_err(&pdev->dev, "failed to get battery information\n");
3114 return ret;
3115 }
3116 }
3117
3118 mutex_init(&di->cc_lock);
3119
3120 /* get parent data */
3121 di->dev = &pdev->dev;
3122 di->parent = dev_get_drvdata(pdev->dev.parent);
3123 di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
3124
3125 di->fg_psy.name = "ab8500_fg";
3126 di->fg_psy.type = POWER_SUPPLY_TYPE_BATTERY;
3127 di->fg_psy.properties = ab8500_fg_props;
3128 di->fg_psy.num_properties = ARRAY_SIZE(ab8500_fg_props);
3129 di->fg_psy.get_property = ab8500_fg_get_property;
3130 di->fg_psy.supplied_to = supply_interface;
3131 di->fg_psy.num_supplicants = ARRAY_SIZE(supply_interface),
3132 di->fg_psy.external_power_changed = ab8500_fg_external_power_changed;
3133
3134 di->bat_cap.max_mah_design = MILLI_TO_MICRO *
3135 di->bm->bat_type[di->bm->batt_id].charge_full_design;
3136
3137 di->bat_cap.max_mah = di->bat_cap.max_mah_design;
3138
3139 di->vbat_nom = di->bm->bat_type[di->bm->batt_id].nominal_voltage;
3140
3141 di->init_capacity = true;
3142
3143 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
3144 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT);
3145
3146 /* Create a work queue for running the FG algorithm */
3147 di->fg_wq = create_singlethread_workqueue("ab8500_fg_wq");
3148 if (di->fg_wq == NULL) {
3149 dev_err(di->dev, "failed to create work queue\n");
3150 return -ENOMEM;
3151 }
3152
3153 /* Init work for running the fg algorithm instantly */
3154 INIT_WORK(&di->fg_work, ab8500_fg_instant_work);
3155
3156 /* Init work for getting the battery accumulated current */
3157 INIT_WORK(&di->fg_acc_cur_work, ab8500_fg_acc_cur_work);
3158
3159 /* Init work for reinitialising the fg algorithm */
3160 INIT_DEFERRABLE_WORK(&di->fg_reinit_work,
3161 ab8500_fg_reinit_work);
3162
3163 /* Work delayed Queue to run the state machine */
3164 INIT_DEFERRABLE_WORK(&di->fg_periodic_work,
3165 ab8500_fg_periodic_work);
3166
3167 /* Work to check low battery condition */
3168 INIT_DEFERRABLE_WORK(&di->fg_low_bat_work,
3169 ab8500_fg_low_bat_work);
3170
3171 /* Init work for HW failure check */
3172 INIT_DEFERRABLE_WORK(&di->fg_check_hw_failure_work,
3173 ab8500_fg_check_hw_failure_work);
3174
3175 /* Reset battery low voltage flag */
3176 di->flags.low_bat = false;
3177
3178 /* Initialize low battery counter */
3179 di->low_bat_cnt = 10;
3180
3181 /* Initialize OVV, and other registers */
3182 ret = ab8500_fg_init_hw_registers(di);
3183 if (ret) {
3184 dev_err(di->dev, "failed to initialize registers\n");
3185 goto free_inst_curr_wq;
3186 }
3187
3188 /* Consider battery unknown until we're informed otherwise */
3189 di->flags.batt_unknown = true;
3190 di->flags.batt_id_received = false;
3191
3192 /* Register FG power supply class */
3193 ret = power_supply_register(di->dev, &di->fg_psy);
3194 if (ret) {
3195 dev_err(di->dev, "failed to register FG psy\n");
3196 goto free_inst_curr_wq;
3197 }
3198
3199 di->fg_samples = SEC_TO_SAMPLE(di->bm->fg_params->init_timer);
3200 ab8500_fg_coulomb_counter(di, true);
3201
3202 /*
3203 * Initialize completion used to notify completion and start
3204 * of inst current
3205 */
3206 init_completion(&di->ab8500_fg_started);
3207 init_completion(&di->ab8500_fg_complete);
3208
3209 /* Register interrupts */
3210 for (i = 0; i < ARRAY_SIZE(ab8500_fg_irq); i++) {
3211 irq = platform_get_irq_byname(pdev, ab8500_fg_irq[i].name);
3212 ret = request_threaded_irq(irq, NULL, ab8500_fg_irq[i].isr,
3213 IRQF_SHARED | IRQF_NO_SUSPEND,
3214 ab8500_fg_irq[i].name, di);
3215
3216 if (ret != 0) {
3217 dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
3218 , ab8500_fg_irq[i].name, irq, ret);
3219 goto free_irq;
3220 }
3221 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
3222 ab8500_fg_irq[i].name, irq, ret);
3223 }
3224 di->irq = platform_get_irq_byname(pdev, "CCEOC");
3225 disable_irq(di->irq);
3226 di->nbr_cceoc_irq_cnt = 0;
3227
3228 platform_set_drvdata(pdev, di);
3229
3230 ret = ab8500_fg_sysfs_init(di);
3231 if (ret) {
3232 dev_err(di->dev, "failed to create sysfs entry\n");
3233 goto free_irq;
3234 }
3235
3236 ret = ab8500_fg_sysfs_psy_create_attrs(di->fg_psy.dev);
3237 if (ret) {
3238 dev_err(di->dev, "failed to create FG psy\n");
3239 ab8500_fg_sysfs_exit(di);
3240 goto free_irq;
3241 }
3242
3243 /* Calibrate the fg first time */
3244 di->flags.calibrate = true;
3245 di->calib_state = AB8500_FG_CALIB_INIT;
3246
3247 /* Use room temp as default value until we get an update from driver. */
3248 di->bat_temp = 210;
3249
3250 /* Run the FG algorithm */
3251 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
3252
3253 list_add_tail(&di->node, &ab8500_fg_list);
3254
3255 return ret;
3256
3257free_irq:
3258 power_supply_unregister(&di->fg_psy);
3259
3260 /* We also have to free all successfully registered irqs */
3261 for (i = i - 1; i >= 0; i--) {
3262 irq = platform_get_irq_byname(pdev, ab8500_fg_irq[i].name);
3263 free_irq(irq, di);
3264 }
3265free_inst_curr_wq:
3266 destroy_workqueue(di->fg_wq);
3267 return ret;
3268}
3269
3270static const struct of_device_id ab8500_fg_match[] = {
3271 { .compatible = "stericsson,ab8500-fg", },
3272 { },
3273};
3274
3275static struct platform_driver ab8500_fg_driver = {
3276 .probe = ab8500_fg_probe,
3277 .remove = ab8500_fg_remove,
3278 .suspend = ab8500_fg_suspend,
3279 .resume = ab8500_fg_resume,
3280 .driver = {
3281 .name = "ab8500-fg",
3282 .owner = THIS_MODULE,
3283 .of_match_table = ab8500_fg_match,
3284 },
3285};
3286
3287static int __init ab8500_fg_init(void)
3288{
3289 return platform_driver_register(&ab8500_fg_driver);
3290}
3291
3292static void __exit ab8500_fg_exit(void)
3293{
3294 platform_driver_unregister(&ab8500_fg_driver);
3295}
3296
3297subsys_initcall_sync(ab8500_fg_init);
3298module_exit(ab8500_fg_exit);
3299
3300MODULE_LICENSE("GPL v2");
3301MODULE_AUTHOR("Johan Palsson, Karl Komierowski");
3302MODULE_ALIAS("platform:ab8500-fg");
3303MODULE_DESCRIPTION("AB8500 Fuel Gauge driver");
1/*
2 * Copyright (C) ST-Ericsson AB 2012
3 *
4 * Main and Back-up battery management driver.
5 *
6 * Note: Backup battery management is required in case of Li-Ion battery and not
7 * for capacitive battery. HREF boards have capacitive battery and hence backup
8 * battery management is not used and the supported code is available in this
9 * driver.
10 *
11 * License Terms: GNU General Public License v2
12 * Author:
13 * Johan Palsson <johan.palsson@stericsson.com>
14 * Karl Komierowski <karl.komierowski@stericsson.com>
15 * Arun R Murthy <arun.murthy@stericsson.com>
16 */
17
18#include <linux/init.h>
19#include <linux/module.h>
20#include <linux/device.h>
21#include <linux/interrupt.h>
22#include <linux/platform_device.h>
23#include <linux/power_supply.h>
24#include <linux/kobject.h>
25#include <linux/slab.h>
26#include <linux/delay.h>
27#include <linux/time.h>
28#include <linux/time64.h>
29#include <linux/of.h>
30#include <linux/completion.h>
31#include <linux/mfd/core.h>
32#include <linux/mfd/abx500.h>
33#include <linux/mfd/abx500/ab8500.h>
34#include <linux/mfd/abx500/ab8500-bm.h>
35#include <linux/mfd/abx500/ab8500-gpadc.h>
36#include <linux/kernel.h>
37
38#define MILLI_TO_MICRO 1000
39#define FG_LSB_IN_MA 1627
40#define QLSB_NANO_AMP_HOURS_X10 1071
41#define INS_CURR_TIMEOUT (3 * HZ)
42
43#define SEC_TO_SAMPLE(S) (S * 4)
44
45#define NBR_AVG_SAMPLES 20
46
47#define LOW_BAT_CHECK_INTERVAL (HZ / 16) /* 62.5 ms */
48
49#define VALID_CAPACITY_SEC (45 * 60) /* 45 minutes */
50#define BATT_OK_MIN 2360 /* mV */
51#define BATT_OK_INCREMENT 50 /* mV */
52#define BATT_OK_MAX_NR_INCREMENTS 0xE
53
54/* FG constants */
55#define BATT_OVV 0x01
56
57#define interpolate(x, x1, y1, x2, y2) \
58 ((y1) + ((((y2) - (y1)) * ((x) - (x1))) / ((x2) - (x1))));
59
60/**
61 * struct ab8500_fg_interrupts - ab8500 fg interupts
62 * @name: name of the interrupt
63 * @isr function pointer to the isr
64 */
65struct ab8500_fg_interrupts {
66 char *name;
67 irqreturn_t (*isr)(int irq, void *data);
68};
69
70enum ab8500_fg_discharge_state {
71 AB8500_FG_DISCHARGE_INIT,
72 AB8500_FG_DISCHARGE_INITMEASURING,
73 AB8500_FG_DISCHARGE_INIT_RECOVERY,
74 AB8500_FG_DISCHARGE_RECOVERY,
75 AB8500_FG_DISCHARGE_READOUT_INIT,
76 AB8500_FG_DISCHARGE_READOUT,
77 AB8500_FG_DISCHARGE_WAKEUP,
78};
79
80static char *discharge_state[] = {
81 "DISCHARGE_INIT",
82 "DISCHARGE_INITMEASURING",
83 "DISCHARGE_INIT_RECOVERY",
84 "DISCHARGE_RECOVERY",
85 "DISCHARGE_READOUT_INIT",
86 "DISCHARGE_READOUT",
87 "DISCHARGE_WAKEUP",
88};
89
90enum ab8500_fg_charge_state {
91 AB8500_FG_CHARGE_INIT,
92 AB8500_FG_CHARGE_READOUT,
93};
94
95static char *charge_state[] = {
96 "CHARGE_INIT",
97 "CHARGE_READOUT",
98};
99
100enum ab8500_fg_calibration_state {
101 AB8500_FG_CALIB_INIT,
102 AB8500_FG_CALIB_WAIT,
103 AB8500_FG_CALIB_END,
104};
105
106struct ab8500_fg_avg_cap {
107 int avg;
108 int samples[NBR_AVG_SAMPLES];
109 time64_t time_stamps[NBR_AVG_SAMPLES];
110 int pos;
111 int nbr_samples;
112 int sum;
113};
114
115struct ab8500_fg_cap_scaling {
116 bool enable;
117 int cap_to_scale[2];
118 int disable_cap_level;
119 int scaled_cap;
120};
121
122struct ab8500_fg_battery_capacity {
123 int max_mah_design;
124 int max_mah;
125 int mah;
126 int permille;
127 int level;
128 int prev_mah;
129 int prev_percent;
130 int prev_level;
131 int user_mah;
132 struct ab8500_fg_cap_scaling cap_scale;
133};
134
135struct ab8500_fg_flags {
136 bool fg_enabled;
137 bool conv_done;
138 bool charging;
139 bool fully_charged;
140 bool force_full;
141 bool low_bat_delay;
142 bool low_bat;
143 bool bat_ovv;
144 bool batt_unknown;
145 bool calibrate;
146 bool user_cap;
147 bool batt_id_received;
148};
149
150struct inst_curr_result_list {
151 struct list_head list;
152 int *result;
153};
154
155/**
156 * struct ab8500_fg - ab8500 FG device information
157 * @dev: Pointer to the structure device
158 * @node: a list of AB8500 FGs, hence prepared for reentrance
159 * @irq holds the CCEOC interrupt number
160 * @vbat: Battery voltage in mV
161 * @vbat_nom: Nominal battery voltage in mV
162 * @inst_curr: Instantenous battery current in mA
163 * @avg_curr: Average battery current in mA
164 * @bat_temp battery temperature
165 * @fg_samples: Number of samples used in the FG accumulation
166 * @accu_charge: Accumulated charge from the last conversion
167 * @recovery_cnt: Counter for recovery mode
168 * @high_curr_cnt: Counter for high current mode
169 * @init_cnt: Counter for init mode
170 * @low_bat_cnt Counter for number of consecutive low battery measures
171 * @nbr_cceoc_irq_cnt Counter for number of CCEOC irqs received since enabled
172 * @recovery_needed: Indicate if recovery is needed
173 * @high_curr_mode: Indicate if we're in high current mode
174 * @init_capacity: Indicate if initial capacity measuring should be done
175 * @turn_off_fg: True if fg was off before current measurement
176 * @calib_state State during offset calibration
177 * @discharge_state: Current discharge state
178 * @charge_state: Current charge state
179 * @ab8500_fg_started Completion struct used for the instant current start
180 * @ab8500_fg_complete Completion struct used for the instant current reading
181 * @flags: Structure for information about events triggered
182 * @bat_cap: Structure for battery capacity specific parameters
183 * @avg_cap: Average capacity filter
184 * @parent: Pointer to the struct ab8500
185 * @gpadc: Pointer to the struct gpadc
186 * @bm: Platform specific battery management information
187 * @fg_psy: Structure that holds the FG specific battery properties
188 * @fg_wq: Work queue for running the FG algorithm
189 * @fg_periodic_work: Work to run the FG algorithm periodically
190 * @fg_low_bat_work: Work to check low bat condition
191 * @fg_reinit_work Work used to reset and reinitialise the FG algorithm
192 * @fg_work: Work to run the FG algorithm instantly
193 * @fg_acc_cur_work: Work to read the FG accumulator
194 * @fg_check_hw_failure_work: Work for checking HW state
195 * @cc_lock: Mutex for locking the CC
196 * @fg_kobject: Structure of type kobject
197 */
198struct ab8500_fg {
199 struct device *dev;
200 struct list_head node;
201 int irq;
202 int vbat;
203 int vbat_nom;
204 int inst_curr;
205 int avg_curr;
206 int bat_temp;
207 int fg_samples;
208 int accu_charge;
209 int recovery_cnt;
210 int high_curr_cnt;
211 int init_cnt;
212 int low_bat_cnt;
213 int nbr_cceoc_irq_cnt;
214 bool recovery_needed;
215 bool high_curr_mode;
216 bool init_capacity;
217 bool turn_off_fg;
218 enum ab8500_fg_calibration_state calib_state;
219 enum ab8500_fg_discharge_state discharge_state;
220 enum ab8500_fg_charge_state charge_state;
221 struct completion ab8500_fg_started;
222 struct completion ab8500_fg_complete;
223 struct ab8500_fg_flags flags;
224 struct ab8500_fg_battery_capacity bat_cap;
225 struct ab8500_fg_avg_cap avg_cap;
226 struct ab8500 *parent;
227 struct ab8500_gpadc *gpadc;
228 struct abx500_bm_data *bm;
229 struct power_supply *fg_psy;
230 struct workqueue_struct *fg_wq;
231 struct delayed_work fg_periodic_work;
232 struct delayed_work fg_low_bat_work;
233 struct delayed_work fg_reinit_work;
234 struct work_struct fg_work;
235 struct work_struct fg_acc_cur_work;
236 struct delayed_work fg_check_hw_failure_work;
237 struct mutex cc_lock;
238 struct kobject fg_kobject;
239};
240static LIST_HEAD(ab8500_fg_list);
241
242/**
243 * ab8500_fg_get() - returns a reference to the primary AB8500 fuel gauge
244 * (i.e. the first fuel gauge in the instance list)
245 */
246struct ab8500_fg *ab8500_fg_get(void)
247{
248 struct ab8500_fg *fg;
249
250 if (list_empty(&ab8500_fg_list))
251 return NULL;
252
253 fg = list_first_entry(&ab8500_fg_list, struct ab8500_fg, node);
254 return fg;
255}
256
257/* Main battery properties */
258static enum power_supply_property ab8500_fg_props[] = {
259 POWER_SUPPLY_PROP_VOLTAGE_NOW,
260 POWER_SUPPLY_PROP_CURRENT_NOW,
261 POWER_SUPPLY_PROP_CURRENT_AVG,
262 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
263 POWER_SUPPLY_PROP_ENERGY_FULL,
264 POWER_SUPPLY_PROP_ENERGY_NOW,
265 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
266 POWER_SUPPLY_PROP_CHARGE_FULL,
267 POWER_SUPPLY_PROP_CHARGE_NOW,
268 POWER_SUPPLY_PROP_CAPACITY,
269 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
270};
271
272/*
273 * This array maps the raw hex value to lowbat voltage used by the AB8500
274 * Values taken from the UM0836
275 */
276static int ab8500_fg_lowbat_voltage_map[] = {
277 2300 ,
278 2325 ,
279 2350 ,
280 2375 ,
281 2400 ,
282 2425 ,
283 2450 ,
284 2475 ,
285 2500 ,
286 2525 ,
287 2550 ,
288 2575 ,
289 2600 ,
290 2625 ,
291 2650 ,
292 2675 ,
293 2700 ,
294 2725 ,
295 2750 ,
296 2775 ,
297 2800 ,
298 2825 ,
299 2850 ,
300 2875 ,
301 2900 ,
302 2925 ,
303 2950 ,
304 2975 ,
305 3000 ,
306 3025 ,
307 3050 ,
308 3075 ,
309 3100 ,
310 3125 ,
311 3150 ,
312 3175 ,
313 3200 ,
314 3225 ,
315 3250 ,
316 3275 ,
317 3300 ,
318 3325 ,
319 3350 ,
320 3375 ,
321 3400 ,
322 3425 ,
323 3450 ,
324 3475 ,
325 3500 ,
326 3525 ,
327 3550 ,
328 3575 ,
329 3600 ,
330 3625 ,
331 3650 ,
332 3675 ,
333 3700 ,
334 3725 ,
335 3750 ,
336 3775 ,
337 3800 ,
338 3825 ,
339 3850 ,
340 3850 ,
341};
342
343static u8 ab8500_volt_to_regval(int voltage)
344{
345 int i;
346
347 if (voltage < ab8500_fg_lowbat_voltage_map[0])
348 return 0;
349
350 for (i = 0; i < ARRAY_SIZE(ab8500_fg_lowbat_voltage_map); i++) {
351 if (voltage < ab8500_fg_lowbat_voltage_map[i])
352 return (u8) i - 1;
353 }
354
355 /* If not captured above, return index of last element */
356 return (u8) ARRAY_SIZE(ab8500_fg_lowbat_voltage_map) - 1;
357}
358
359/**
360 * ab8500_fg_is_low_curr() - Low or high current mode
361 * @di: pointer to the ab8500_fg structure
362 * @curr: the current to base or our decision on
363 *
364 * Low current mode if the current consumption is below a certain threshold
365 */
366static int ab8500_fg_is_low_curr(struct ab8500_fg *di, int curr)
367{
368 /*
369 * We want to know if we're in low current mode
370 */
371 if (curr > -di->bm->fg_params->high_curr_threshold)
372 return true;
373 else
374 return false;
375}
376
377/**
378 * ab8500_fg_add_cap_sample() - Add capacity to average filter
379 * @di: pointer to the ab8500_fg structure
380 * @sample: the capacity in mAh to add to the filter
381 *
382 * A capacity is added to the filter and a new mean capacity is calculated and
383 * returned
384 */
385static int ab8500_fg_add_cap_sample(struct ab8500_fg *di, int sample)
386{
387 struct timespec64 ts64;
388 struct ab8500_fg_avg_cap *avg = &di->avg_cap;
389
390 getnstimeofday64(&ts64);
391
392 do {
393 avg->sum += sample - avg->samples[avg->pos];
394 avg->samples[avg->pos] = sample;
395 avg->time_stamps[avg->pos] = ts64.tv_sec;
396 avg->pos++;
397
398 if (avg->pos == NBR_AVG_SAMPLES)
399 avg->pos = 0;
400
401 if (avg->nbr_samples < NBR_AVG_SAMPLES)
402 avg->nbr_samples++;
403
404 /*
405 * Check the time stamp for each sample. If too old,
406 * replace with latest sample
407 */
408 } while (ts64.tv_sec - VALID_CAPACITY_SEC > avg->time_stamps[avg->pos]);
409
410 avg->avg = avg->sum / avg->nbr_samples;
411
412 return avg->avg;
413}
414
415/**
416 * ab8500_fg_clear_cap_samples() - Clear average filter
417 * @di: pointer to the ab8500_fg structure
418 *
419 * The capacity filter is is reset to zero.
420 */
421static void ab8500_fg_clear_cap_samples(struct ab8500_fg *di)
422{
423 int i;
424 struct ab8500_fg_avg_cap *avg = &di->avg_cap;
425
426 avg->pos = 0;
427 avg->nbr_samples = 0;
428 avg->sum = 0;
429 avg->avg = 0;
430
431 for (i = 0; i < NBR_AVG_SAMPLES; i++) {
432 avg->samples[i] = 0;
433 avg->time_stamps[i] = 0;
434 }
435}
436
437/**
438 * ab8500_fg_fill_cap_sample() - Fill average filter
439 * @di: pointer to the ab8500_fg structure
440 * @sample: the capacity in mAh to fill the filter with
441 *
442 * The capacity filter is filled with a capacity in mAh
443 */
444static void ab8500_fg_fill_cap_sample(struct ab8500_fg *di, int sample)
445{
446 int i;
447 struct timespec64 ts64;
448 struct ab8500_fg_avg_cap *avg = &di->avg_cap;
449
450 getnstimeofday64(&ts64);
451
452 for (i = 0; i < NBR_AVG_SAMPLES; i++) {
453 avg->samples[i] = sample;
454 avg->time_stamps[i] = ts64.tv_sec;
455 }
456
457 avg->pos = 0;
458 avg->nbr_samples = NBR_AVG_SAMPLES;
459 avg->sum = sample * NBR_AVG_SAMPLES;
460 avg->avg = sample;
461}
462
463/**
464 * ab8500_fg_coulomb_counter() - enable coulomb counter
465 * @di: pointer to the ab8500_fg structure
466 * @enable: enable/disable
467 *
468 * Enable/Disable coulomb counter.
469 * On failure returns negative value.
470 */
471static int ab8500_fg_coulomb_counter(struct ab8500_fg *di, bool enable)
472{
473 int ret = 0;
474 mutex_lock(&di->cc_lock);
475 if (enable) {
476 /* To be able to reprogram the number of samples, we have to
477 * first stop the CC and then enable it again */
478 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
479 AB8500_RTC_CC_CONF_REG, 0x00);
480 if (ret)
481 goto cc_err;
482
483 /* Program the samples */
484 ret = abx500_set_register_interruptible(di->dev,
485 AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU,
486 di->fg_samples);
487 if (ret)
488 goto cc_err;
489
490 /* Start the CC */
491 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
492 AB8500_RTC_CC_CONF_REG,
493 (CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA));
494 if (ret)
495 goto cc_err;
496
497 di->flags.fg_enabled = true;
498 } else {
499 /* Clear any pending read requests */
500 ret = abx500_mask_and_set_register_interruptible(di->dev,
501 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
502 (RESET_ACCU | READ_REQ), 0);
503 if (ret)
504 goto cc_err;
505
506 ret = abx500_set_register_interruptible(di->dev,
507 AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU_CTRL, 0);
508 if (ret)
509 goto cc_err;
510
511 /* Stop the CC */
512 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
513 AB8500_RTC_CC_CONF_REG, 0);
514 if (ret)
515 goto cc_err;
516
517 di->flags.fg_enabled = false;
518
519 }
520 dev_dbg(di->dev, " CC enabled: %d Samples: %d\n",
521 enable, di->fg_samples);
522
523 mutex_unlock(&di->cc_lock);
524
525 return ret;
526cc_err:
527 dev_err(di->dev, "%s Enabling coulomb counter failed\n", __func__);
528 mutex_unlock(&di->cc_lock);
529 return ret;
530}
531
532/**
533 * ab8500_fg_inst_curr_start() - start battery instantaneous current
534 * @di: pointer to the ab8500_fg structure
535 *
536 * Returns 0 or error code
537 * Note: This is part "one" and has to be called before
538 * ab8500_fg_inst_curr_finalize()
539 */
540int ab8500_fg_inst_curr_start(struct ab8500_fg *di)
541{
542 u8 reg_val;
543 int ret;
544
545 mutex_lock(&di->cc_lock);
546
547 di->nbr_cceoc_irq_cnt = 0;
548 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
549 AB8500_RTC_CC_CONF_REG, ®_val);
550 if (ret < 0)
551 goto fail;
552
553 if (!(reg_val & CC_PWR_UP_ENA)) {
554 dev_dbg(di->dev, "%s Enable FG\n", __func__);
555 di->turn_off_fg = true;
556
557 /* Program the samples */
558 ret = abx500_set_register_interruptible(di->dev,
559 AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU,
560 SEC_TO_SAMPLE(10));
561 if (ret)
562 goto fail;
563
564 /* Start the CC */
565 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
566 AB8500_RTC_CC_CONF_REG,
567 (CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA));
568 if (ret)
569 goto fail;
570 } else {
571 di->turn_off_fg = false;
572 }
573
574 /* Return and WFI */
575 reinit_completion(&di->ab8500_fg_started);
576 reinit_completion(&di->ab8500_fg_complete);
577 enable_irq(di->irq);
578
579 /* Note: cc_lock is still locked */
580 return 0;
581fail:
582 mutex_unlock(&di->cc_lock);
583 return ret;
584}
585
586/**
587 * ab8500_fg_inst_curr_started() - check if fg conversion has started
588 * @di: pointer to the ab8500_fg structure
589 *
590 * Returns 1 if conversion started, 0 if still waiting
591 */
592int ab8500_fg_inst_curr_started(struct ab8500_fg *di)
593{
594 return completion_done(&di->ab8500_fg_started);
595}
596
597/**
598 * ab8500_fg_inst_curr_done() - check if fg conversion is done
599 * @di: pointer to the ab8500_fg structure
600 *
601 * Returns 1 if conversion done, 0 if still waiting
602 */
603int ab8500_fg_inst_curr_done(struct ab8500_fg *di)
604{
605 return completion_done(&di->ab8500_fg_complete);
606}
607
608/**
609 * ab8500_fg_inst_curr_finalize() - battery instantaneous current
610 * @di: pointer to the ab8500_fg structure
611 * @res: battery instantenous current(on success)
612 *
613 * Returns 0 or an error code
614 * Note: This is part "two" and has to be called at earliest 250 ms
615 * after ab8500_fg_inst_curr_start()
616 */
617int ab8500_fg_inst_curr_finalize(struct ab8500_fg *di, int *res)
618{
619 u8 low, high;
620 int val;
621 int ret;
622 unsigned long timeout;
623
624 if (!completion_done(&di->ab8500_fg_complete)) {
625 timeout = wait_for_completion_timeout(
626 &di->ab8500_fg_complete,
627 INS_CURR_TIMEOUT);
628 dev_dbg(di->dev, "Finalize time: %d ms\n",
629 jiffies_to_msecs(INS_CURR_TIMEOUT - timeout));
630 if (!timeout) {
631 ret = -ETIME;
632 disable_irq(di->irq);
633 di->nbr_cceoc_irq_cnt = 0;
634 dev_err(di->dev, "completion timed out [%d]\n",
635 __LINE__);
636 goto fail;
637 }
638 }
639
640 disable_irq(di->irq);
641 di->nbr_cceoc_irq_cnt = 0;
642
643 ret = abx500_mask_and_set_register_interruptible(di->dev,
644 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
645 READ_REQ, READ_REQ);
646
647 /* 100uS between read request and read is needed */
648 usleep_range(100, 100);
649
650 /* Read CC Sample conversion value Low and high */
651 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
652 AB8500_GASG_CC_SMPL_CNVL_REG, &low);
653 if (ret < 0)
654 goto fail;
655
656 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
657 AB8500_GASG_CC_SMPL_CNVH_REG, &high);
658 if (ret < 0)
659 goto fail;
660
661 /*
662 * negative value for Discharging
663 * convert 2's compliment into decimal
664 */
665 if (high & 0x10)
666 val = (low | (high << 8) | 0xFFFFE000);
667 else
668 val = (low | (high << 8));
669
670 /*
671 * Convert to unit value in mA
672 * Full scale input voltage is
673 * 63.160mV => LSB = 63.160mV/(4096*res) = 1.542mA
674 * Given a 250ms conversion cycle time the LSB corresponds
675 * to 107.1 nAh. Convert to current by dividing by the conversion
676 * time in hours (250ms = 1 / (3600 * 4)h)
677 * 107.1nAh assumes 10mOhm, but fg_res is in 0.1mOhm
678 */
679 val = (val * QLSB_NANO_AMP_HOURS_X10 * 36 * 4) /
680 (1000 * di->bm->fg_res);
681
682 if (di->turn_off_fg) {
683 dev_dbg(di->dev, "%s Disable FG\n", __func__);
684
685 /* Clear any pending read requests */
686 ret = abx500_set_register_interruptible(di->dev,
687 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, 0);
688 if (ret)
689 goto fail;
690
691 /* Stop the CC */
692 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
693 AB8500_RTC_CC_CONF_REG, 0);
694 if (ret)
695 goto fail;
696 }
697 mutex_unlock(&di->cc_lock);
698 (*res) = val;
699
700 return 0;
701fail:
702 mutex_unlock(&di->cc_lock);
703 return ret;
704}
705
706/**
707 * ab8500_fg_inst_curr_blocking() - battery instantaneous current
708 * @di: pointer to the ab8500_fg structure
709 * @res: battery instantenous current(on success)
710 *
711 * Returns 0 else error code
712 */
713int ab8500_fg_inst_curr_blocking(struct ab8500_fg *di)
714{
715 int ret;
716 unsigned long timeout;
717 int res = 0;
718
719 ret = ab8500_fg_inst_curr_start(di);
720 if (ret) {
721 dev_err(di->dev, "Failed to initialize fg_inst\n");
722 return 0;
723 }
724
725 /* Wait for CC to actually start */
726 if (!completion_done(&di->ab8500_fg_started)) {
727 timeout = wait_for_completion_timeout(
728 &di->ab8500_fg_started,
729 INS_CURR_TIMEOUT);
730 dev_dbg(di->dev, "Start time: %d ms\n",
731 jiffies_to_msecs(INS_CURR_TIMEOUT - timeout));
732 if (!timeout) {
733 ret = -ETIME;
734 dev_err(di->dev, "completion timed out [%d]\n",
735 __LINE__);
736 goto fail;
737 }
738 }
739
740 ret = ab8500_fg_inst_curr_finalize(di, &res);
741 if (ret) {
742 dev_err(di->dev, "Failed to finalize fg_inst\n");
743 return 0;
744 }
745
746 dev_dbg(di->dev, "%s instant current: %d", __func__, res);
747 return res;
748fail:
749 disable_irq(di->irq);
750 mutex_unlock(&di->cc_lock);
751 return ret;
752}
753
754/**
755 * ab8500_fg_acc_cur_work() - average battery current
756 * @work: pointer to the work_struct structure
757 *
758 * Updated the average battery current obtained from the
759 * coulomb counter.
760 */
761static void ab8500_fg_acc_cur_work(struct work_struct *work)
762{
763 int val;
764 int ret;
765 u8 low, med, high;
766
767 struct ab8500_fg *di = container_of(work,
768 struct ab8500_fg, fg_acc_cur_work);
769
770 mutex_lock(&di->cc_lock);
771 ret = abx500_set_register_interruptible(di->dev, AB8500_GAS_GAUGE,
772 AB8500_GASG_CC_NCOV_ACCU_CTRL, RD_NCONV_ACCU_REQ);
773 if (ret)
774 goto exit;
775
776 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
777 AB8500_GASG_CC_NCOV_ACCU_LOW, &low);
778 if (ret < 0)
779 goto exit;
780
781 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
782 AB8500_GASG_CC_NCOV_ACCU_MED, &med);
783 if (ret < 0)
784 goto exit;
785
786 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
787 AB8500_GASG_CC_NCOV_ACCU_HIGH, &high);
788 if (ret < 0)
789 goto exit;
790
791 /* Check for sign bit in case of negative value, 2's compliment */
792 if (high & 0x10)
793 val = (low | (med << 8) | (high << 16) | 0xFFE00000);
794 else
795 val = (low | (med << 8) | (high << 16));
796
797 /*
798 * Convert to uAh
799 * Given a 250ms conversion cycle time the LSB corresponds
800 * to 112.9 nAh.
801 * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm
802 */
803 di->accu_charge = (val * QLSB_NANO_AMP_HOURS_X10) /
804 (100 * di->bm->fg_res);
805
806 /*
807 * Convert to unit value in mA
808 * by dividing by the conversion
809 * time in hours (= samples / (3600 * 4)h)
810 * and multiply with 1000
811 */
812 di->avg_curr = (val * QLSB_NANO_AMP_HOURS_X10 * 36) /
813 (1000 * di->bm->fg_res * (di->fg_samples / 4));
814
815 di->flags.conv_done = true;
816
817 mutex_unlock(&di->cc_lock);
818
819 queue_work(di->fg_wq, &di->fg_work);
820
821 dev_dbg(di->dev, "fg_res: %d, fg_samples: %d, gasg: %d, accu_charge: %d \n",
822 di->bm->fg_res, di->fg_samples, val, di->accu_charge);
823 return;
824exit:
825 dev_err(di->dev,
826 "Failed to read or write gas gauge registers\n");
827 mutex_unlock(&di->cc_lock);
828 queue_work(di->fg_wq, &di->fg_work);
829}
830
831/**
832 * ab8500_fg_bat_voltage() - get battery voltage
833 * @di: pointer to the ab8500_fg structure
834 *
835 * Returns battery voltage(on success) else error code
836 */
837static int ab8500_fg_bat_voltage(struct ab8500_fg *di)
838{
839 int vbat;
840 static int prev;
841
842 vbat = ab8500_gpadc_convert(di->gpadc, MAIN_BAT_V);
843 if (vbat < 0) {
844 dev_err(di->dev,
845 "%s gpadc conversion failed, using previous value\n",
846 __func__);
847 return prev;
848 }
849
850 prev = vbat;
851 return vbat;
852}
853
854/**
855 * ab8500_fg_volt_to_capacity() - Voltage based capacity
856 * @di: pointer to the ab8500_fg structure
857 * @voltage: The voltage to convert to a capacity
858 *
859 * Returns battery capacity in per mille based on voltage
860 */
861static int ab8500_fg_volt_to_capacity(struct ab8500_fg *di, int voltage)
862{
863 int i, tbl_size;
864 const struct abx500_v_to_cap *tbl;
865 int cap = 0;
866
867 tbl = di->bm->bat_type[di->bm->batt_id].v_to_cap_tbl,
868 tbl_size = di->bm->bat_type[di->bm->batt_id].n_v_cap_tbl_elements;
869
870 for (i = 0; i < tbl_size; ++i) {
871 if (voltage > tbl[i].voltage)
872 break;
873 }
874
875 if ((i > 0) && (i < tbl_size)) {
876 cap = interpolate(voltage,
877 tbl[i].voltage,
878 tbl[i].capacity * 10,
879 tbl[i-1].voltage,
880 tbl[i-1].capacity * 10);
881 } else if (i == 0) {
882 cap = 1000;
883 } else {
884 cap = 0;
885 }
886
887 dev_dbg(di->dev, "%s Vbat: %d, Cap: %d per mille",
888 __func__, voltage, cap);
889
890 return cap;
891}
892
893/**
894 * ab8500_fg_uncomp_volt_to_capacity() - Uncompensated voltage based capacity
895 * @di: pointer to the ab8500_fg structure
896 *
897 * Returns battery capacity based on battery voltage that is not compensated
898 * for the voltage drop due to the load
899 */
900static int ab8500_fg_uncomp_volt_to_capacity(struct ab8500_fg *di)
901{
902 di->vbat = ab8500_fg_bat_voltage(di);
903 return ab8500_fg_volt_to_capacity(di, di->vbat);
904}
905
906/**
907 * ab8500_fg_battery_resistance() - Returns the battery inner resistance
908 * @di: pointer to the ab8500_fg structure
909 *
910 * Returns battery inner resistance added with the fuel gauge resistor value
911 * to get the total resistance in the whole link from gnd to bat+ node.
912 */
913static int ab8500_fg_battery_resistance(struct ab8500_fg *di)
914{
915 int i, tbl_size;
916 const struct batres_vs_temp *tbl;
917 int resist = 0;
918
919 tbl = di->bm->bat_type[di->bm->batt_id].batres_tbl;
920 tbl_size = di->bm->bat_type[di->bm->batt_id].n_batres_tbl_elements;
921
922 for (i = 0; i < tbl_size; ++i) {
923 if (di->bat_temp / 10 > tbl[i].temp)
924 break;
925 }
926
927 if ((i > 0) && (i < tbl_size)) {
928 resist = interpolate(di->bat_temp / 10,
929 tbl[i].temp,
930 tbl[i].resist,
931 tbl[i-1].temp,
932 tbl[i-1].resist);
933 } else if (i == 0) {
934 resist = tbl[0].resist;
935 } else {
936 resist = tbl[tbl_size - 1].resist;
937 }
938
939 dev_dbg(di->dev, "%s Temp: %d battery internal resistance: %d"
940 " fg resistance %d, total: %d (mOhm)\n",
941 __func__, di->bat_temp, resist, di->bm->fg_res / 10,
942 (di->bm->fg_res / 10) + resist);
943
944 /* fg_res variable is in 0.1mOhm */
945 resist += di->bm->fg_res / 10;
946
947 return resist;
948}
949
950/**
951 * ab8500_fg_load_comp_volt_to_capacity() - Load compensated voltage based capacity
952 * @di: pointer to the ab8500_fg structure
953 *
954 * Returns battery capacity based on battery voltage that is load compensated
955 * for the voltage drop
956 */
957static int ab8500_fg_load_comp_volt_to_capacity(struct ab8500_fg *di)
958{
959 int vbat_comp, res;
960 int i = 0;
961 int vbat = 0;
962
963 ab8500_fg_inst_curr_start(di);
964
965 do {
966 vbat += ab8500_fg_bat_voltage(di);
967 i++;
968 usleep_range(5000, 6000);
969 } while (!ab8500_fg_inst_curr_done(di));
970
971 ab8500_fg_inst_curr_finalize(di, &di->inst_curr);
972
973 di->vbat = vbat / i;
974 res = ab8500_fg_battery_resistance(di);
975
976 /* Use Ohms law to get the load compensated voltage */
977 vbat_comp = di->vbat - (di->inst_curr * res) / 1000;
978
979 dev_dbg(di->dev, "%s Measured Vbat: %dmV,Compensated Vbat %dmV, "
980 "R: %dmOhm, Current: %dmA Vbat Samples: %d\n",
981 __func__, di->vbat, vbat_comp, res, di->inst_curr, i);
982
983 return ab8500_fg_volt_to_capacity(di, vbat_comp);
984}
985
986/**
987 * ab8500_fg_convert_mah_to_permille() - Capacity in mAh to permille
988 * @di: pointer to the ab8500_fg structure
989 * @cap_mah: capacity in mAh
990 *
991 * Converts capacity in mAh to capacity in permille
992 */
993static int ab8500_fg_convert_mah_to_permille(struct ab8500_fg *di, int cap_mah)
994{
995 return (cap_mah * 1000) / di->bat_cap.max_mah_design;
996}
997
998/**
999 * ab8500_fg_convert_permille_to_mah() - Capacity in permille to mAh
1000 * @di: pointer to the ab8500_fg structure
1001 * @cap_pm: capacity in permille
1002 *
1003 * Converts capacity in permille to capacity in mAh
1004 */
1005static int ab8500_fg_convert_permille_to_mah(struct ab8500_fg *di, int cap_pm)
1006{
1007 return cap_pm * di->bat_cap.max_mah_design / 1000;
1008}
1009
1010/**
1011 * ab8500_fg_convert_mah_to_uwh() - Capacity in mAh to uWh
1012 * @di: pointer to the ab8500_fg structure
1013 * @cap_mah: capacity in mAh
1014 *
1015 * Converts capacity in mAh to capacity in uWh
1016 */
1017static int ab8500_fg_convert_mah_to_uwh(struct ab8500_fg *di, int cap_mah)
1018{
1019 u64 div_res;
1020 u32 div_rem;
1021
1022 div_res = ((u64) cap_mah) * ((u64) di->vbat_nom);
1023 div_rem = do_div(div_res, 1000);
1024
1025 /* Make sure to round upwards if necessary */
1026 if (div_rem >= 1000 / 2)
1027 div_res++;
1028
1029 return (int) div_res;
1030}
1031
1032/**
1033 * ab8500_fg_calc_cap_charging() - Calculate remaining capacity while charging
1034 * @di: pointer to the ab8500_fg structure
1035 *
1036 * Return the capacity in mAh based on previous calculated capcity and the FG
1037 * accumulator register value. The filter is filled with this capacity
1038 */
1039static int ab8500_fg_calc_cap_charging(struct ab8500_fg *di)
1040{
1041 dev_dbg(di->dev, "%s cap_mah %d accu_charge %d\n",
1042 __func__,
1043 di->bat_cap.mah,
1044 di->accu_charge);
1045
1046 /* Capacity should not be less than 0 */
1047 if (di->bat_cap.mah + di->accu_charge > 0)
1048 di->bat_cap.mah += di->accu_charge;
1049 else
1050 di->bat_cap.mah = 0;
1051 /*
1052 * We force capacity to 100% once when the algorithm
1053 * reports that it's full.
1054 */
1055 if (di->bat_cap.mah >= di->bat_cap.max_mah_design ||
1056 di->flags.force_full) {
1057 di->bat_cap.mah = di->bat_cap.max_mah_design;
1058 }
1059
1060 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
1061 di->bat_cap.permille =
1062 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1063
1064 /* We need to update battery voltage and inst current when charging */
1065 di->vbat = ab8500_fg_bat_voltage(di);
1066 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1067
1068 return di->bat_cap.mah;
1069}
1070
1071/**
1072 * ab8500_fg_calc_cap_discharge_voltage() - Capacity in discharge with voltage
1073 * @di: pointer to the ab8500_fg structure
1074 * @comp: if voltage should be load compensated before capacity calc
1075 *
1076 * Return the capacity in mAh based on the battery voltage. The voltage can
1077 * either be load compensated or not. This value is added to the filter and a
1078 * new mean value is calculated and returned.
1079 */
1080static int ab8500_fg_calc_cap_discharge_voltage(struct ab8500_fg *di, bool comp)
1081{
1082 int permille, mah;
1083
1084 if (comp)
1085 permille = ab8500_fg_load_comp_volt_to_capacity(di);
1086 else
1087 permille = ab8500_fg_uncomp_volt_to_capacity(di);
1088
1089 mah = ab8500_fg_convert_permille_to_mah(di, permille);
1090
1091 di->bat_cap.mah = ab8500_fg_add_cap_sample(di, mah);
1092 di->bat_cap.permille =
1093 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1094
1095 return di->bat_cap.mah;
1096}
1097
1098/**
1099 * ab8500_fg_calc_cap_discharge_fg() - Capacity in discharge with FG
1100 * @di: pointer to the ab8500_fg structure
1101 *
1102 * Return the capacity in mAh based on previous calculated capcity and the FG
1103 * accumulator register value. This value is added to the filter and a
1104 * new mean value is calculated and returned.
1105 */
1106static int ab8500_fg_calc_cap_discharge_fg(struct ab8500_fg *di)
1107{
1108 int permille_volt, permille;
1109
1110 dev_dbg(di->dev, "%s cap_mah %d accu_charge %d\n",
1111 __func__,
1112 di->bat_cap.mah,
1113 di->accu_charge);
1114
1115 /* Capacity should not be less than 0 */
1116 if (di->bat_cap.mah + di->accu_charge > 0)
1117 di->bat_cap.mah += di->accu_charge;
1118 else
1119 di->bat_cap.mah = 0;
1120
1121 if (di->bat_cap.mah >= di->bat_cap.max_mah_design)
1122 di->bat_cap.mah = di->bat_cap.max_mah_design;
1123
1124 /*
1125 * Check against voltage based capacity. It can not be lower
1126 * than what the uncompensated voltage says
1127 */
1128 permille = ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1129 permille_volt = ab8500_fg_uncomp_volt_to_capacity(di);
1130
1131 if (permille < permille_volt) {
1132 di->bat_cap.permille = permille_volt;
1133 di->bat_cap.mah = ab8500_fg_convert_permille_to_mah(di,
1134 di->bat_cap.permille);
1135
1136 dev_dbg(di->dev, "%s voltage based: perm %d perm_volt %d\n",
1137 __func__,
1138 permille,
1139 permille_volt);
1140
1141 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
1142 } else {
1143 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
1144 di->bat_cap.permille =
1145 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1146 }
1147
1148 return di->bat_cap.mah;
1149}
1150
1151/**
1152 * ab8500_fg_capacity_level() - Get the battery capacity level
1153 * @di: pointer to the ab8500_fg structure
1154 *
1155 * Get the battery capacity level based on the capacity in percent
1156 */
1157static int ab8500_fg_capacity_level(struct ab8500_fg *di)
1158{
1159 int ret, percent;
1160
1161 percent = DIV_ROUND_CLOSEST(di->bat_cap.permille, 10);
1162
1163 if (percent <= di->bm->cap_levels->critical ||
1164 di->flags.low_bat)
1165 ret = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
1166 else if (percent <= di->bm->cap_levels->low)
1167 ret = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
1168 else if (percent <= di->bm->cap_levels->normal)
1169 ret = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
1170 else if (percent <= di->bm->cap_levels->high)
1171 ret = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;
1172 else
1173 ret = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
1174
1175 return ret;
1176}
1177
1178/**
1179 * ab8500_fg_calculate_scaled_capacity() - Capacity scaling
1180 * @di: pointer to the ab8500_fg structure
1181 *
1182 * Calculates the capacity to be shown to upper layers. Scales the capacity
1183 * to have 100% as a reference from the actual capacity upon removal of charger
1184 * when charging is in maintenance mode.
1185 */
1186static int ab8500_fg_calculate_scaled_capacity(struct ab8500_fg *di)
1187{
1188 struct ab8500_fg_cap_scaling *cs = &di->bat_cap.cap_scale;
1189 int capacity = di->bat_cap.prev_percent;
1190
1191 if (!cs->enable)
1192 return capacity;
1193
1194 /*
1195 * As long as we are in fully charge mode scale the capacity
1196 * to show 100%.
1197 */
1198 if (di->flags.fully_charged) {
1199 cs->cap_to_scale[0] = 100;
1200 cs->cap_to_scale[1] =
1201 max(capacity, di->bm->fg_params->maint_thres);
1202 dev_dbg(di->dev, "Scale cap with %d/%d\n",
1203 cs->cap_to_scale[0], cs->cap_to_scale[1]);
1204 }
1205
1206 /* Calculates the scaled capacity. */
1207 if ((cs->cap_to_scale[0] != cs->cap_to_scale[1])
1208 && (cs->cap_to_scale[1] > 0))
1209 capacity = min(100,
1210 DIV_ROUND_CLOSEST(di->bat_cap.prev_percent *
1211 cs->cap_to_scale[0],
1212 cs->cap_to_scale[1]));
1213
1214 if (di->flags.charging) {
1215 if (capacity < cs->disable_cap_level) {
1216 cs->disable_cap_level = capacity;
1217 dev_dbg(di->dev, "Cap to stop scale lowered %d%%\n",
1218 cs->disable_cap_level);
1219 } else if (!di->flags.fully_charged) {
1220 if (di->bat_cap.prev_percent >=
1221 cs->disable_cap_level) {
1222 dev_dbg(di->dev, "Disabling scaled capacity\n");
1223 cs->enable = false;
1224 capacity = di->bat_cap.prev_percent;
1225 } else {
1226 dev_dbg(di->dev,
1227 "Waiting in cap to level %d%%\n",
1228 cs->disable_cap_level);
1229 capacity = cs->disable_cap_level;
1230 }
1231 }
1232 }
1233
1234 return capacity;
1235}
1236
1237/**
1238 * ab8500_fg_update_cap_scalers() - Capacity scaling
1239 * @di: pointer to the ab8500_fg structure
1240 *
1241 * To be called when state change from charge<->discharge to update
1242 * the capacity scalers.
1243 */
1244static void ab8500_fg_update_cap_scalers(struct ab8500_fg *di)
1245{
1246 struct ab8500_fg_cap_scaling *cs = &di->bat_cap.cap_scale;
1247
1248 if (!cs->enable)
1249 return;
1250 if (di->flags.charging) {
1251 di->bat_cap.cap_scale.disable_cap_level =
1252 di->bat_cap.cap_scale.scaled_cap;
1253 dev_dbg(di->dev, "Cap to stop scale at charge %d%%\n",
1254 di->bat_cap.cap_scale.disable_cap_level);
1255 } else {
1256 if (cs->scaled_cap != 100) {
1257 cs->cap_to_scale[0] = cs->scaled_cap;
1258 cs->cap_to_scale[1] = di->bat_cap.prev_percent;
1259 } else {
1260 cs->cap_to_scale[0] = 100;
1261 cs->cap_to_scale[1] =
1262 max(di->bat_cap.prev_percent,
1263 di->bm->fg_params->maint_thres);
1264 }
1265
1266 dev_dbg(di->dev, "Cap to scale at discharge %d/%d\n",
1267 cs->cap_to_scale[0], cs->cap_to_scale[1]);
1268 }
1269}
1270
1271/**
1272 * ab8500_fg_check_capacity_limits() - Check if capacity has changed
1273 * @di: pointer to the ab8500_fg structure
1274 * @init: capacity is allowed to go up in init mode
1275 *
1276 * Check if capacity or capacity limit has changed and notify the system
1277 * about it using the power_supply framework
1278 */
1279static void ab8500_fg_check_capacity_limits(struct ab8500_fg *di, bool init)
1280{
1281 bool changed = false;
1282 int percent = DIV_ROUND_CLOSEST(di->bat_cap.permille, 10);
1283
1284 di->bat_cap.level = ab8500_fg_capacity_level(di);
1285
1286 if (di->bat_cap.level != di->bat_cap.prev_level) {
1287 /*
1288 * We do not allow reported capacity level to go up
1289 * unless we're charging or if we're in init
1290 */
1291 if (!(!di->flags.charging && di->bat_cap.level >
1292 di->bat_cap.prev_level) || init) {
1293 dev_dbg(di->dev, "level changed from %d to %d\n",
1294 di->bat_cap.prev_level,
1295 di->bat_cap.level);
1296 di->bat_cap.prev_level = di->bat_cap.level;
1297 changed = true;
1298 } else {
1299 dev_dbg(di->dev, "level not allowed to go up "
1300 "since no charger is connected: %d to %d\n",
1301 di->bat_cap.prev_level,
1302 di->bat_cap.level);
1303 }
1304 }
1305
1306 /*
1307 * If we have received the LOW_BAT IRQ, set capacity to 0 to initiate
1308 * shutdown
1309 */
1310 if (di->flags.low_bat) {
1311 dev_dbg(di->dev, "Battery low, set capacity to 0\n");
1312 di->bat_cap.prev_percent = 0;
1313 di->bat_cap.permille = 0;
1314 percent = 0;
1315 di->bat_cap.prev_mah = 0;
1316 di->bat_cap.mah = 0;
1317 changed = true;
1318 } else if (di->flags.fully_charged) {
1319 /*
1320 * We report 100% if algorithm reported fully charged
1321 * and show 100% during maintenance charging (scaling).
1322 */
1323 if (di->flags.force_full) {
1324 di->bat_cap.prev_percent = percent;
1325 di->bat_cap.prev_mah = di->bat_cap.mah;
1326
1327 changed = true;
1328
1329 if (!di->bat_cap.cap_scale.enable &&
1330 di->bm->capacity_scaling) {
1331 di->bat_cap.cap_scale.enable = true;
1332 di->bat_cap.cap_scale.cap_to_scale[0] = 100;
1333 di->bat_cap.cap_scale.cap_to_scale[1] =
1334 di->bat_cap.prev_percent;
1335 di->bat_cap.cap_scale.disable_cap_level = 100;
1336 }
1337 } else if (di->bat_cap.prev_percent != percent) {
1338 dev_dbg(di->dev,
1339 "battery reported full "
1340 "but capacity dropping: %d\n",
1341 percent);
1342 di->bat_cap.prev_percent = percent;
1343 di->bat_cap.prev_mah = di->bat_cap.mah;
1344
1345 changed = true;
1346 }
1347 } else if (di->bat_cap.prev_percent != percent) {
1348 if (percent == 0) {
1349 /*
1350 * We will not report 0% unless we've got
1351 * the LOW_BAT IRQ, no matter what the FG
1352 * algorithm says.
1353 */
1354 di->bat_cap.prev_percent = 1;
1355 percent = 1;
1356
1357 changed = true;
1358 } else if (!(!di->flags.charging &&
1359 percent > di->bat_cap.prev_percent) || init) {
1360 /*
1361 * We do not allow reported capacity to go up
1362 * unless we're charging or if we're in init
1363 */
1364 dev_dbg(di->dev,
1365 "capacity changed from %d to %d (%d)\n",
1366 di->bat_cap.prev_percent,
1367 percent,
1368 di->bat_cap.permille);
1369 di->bat_cap.prev_percent = percent;
1370 di->bat_cap.prev_mah = di->bat_cap.mah;
1371
1372 changed = true;
1373 } else {
1374 dev_dbg(di->dev, "capacity not allowed to go up since "
1375 "no charger is connected: %d to %d (%d)\n",
1376 di->bat_cap.prev_percent,
1377 percent,
1378 di->bat_cap.permille);
1379 }
1380 }
1381
1382 if (changed) {
1383 if (di->bm->capacity_scaling) {
1384 di->bat_cap.cap_scale.scaled_cap =
1385 ab8500_fg_calculate_scaled_capacity(di);
1386
1387 dev_info(di->dev, "capacity=%d (%d)\n",
1388 di->bat_cap.prev_percent,
1389 di->bat_cap.cap_scale.scaled_cap);
1390 }
1391 power_supply_changed(di->fg_psy);
1392 if (di->flags.fully_charged && di->flags.force_full) {
1393 dev_dbg(di->dev, "Battery full, notifying.\n");
1394 di->flags.force_full = false;
1395 sysfs_notify(&di->fg_kobject, NULL, "charge_full");
1396 }
1397 sysfs_notify(&di->fg_kobject, NULL, "charge_now");
1398 }
1399}
1400
1401static void ab8500_fg_charge_state_to(struct ab8500_fg *di,
1402 enum ab8500_fg_charge_state new_state)
1403{
1404 dev_dbg(di->dev, "Charge state from %d [%s] to %d [%s]\n",
1405 di->charge_state,
1406 charge_state[di->charge_state],
1407 new_state,
1408 charge_state[new_state]);
1409
1410 di->charge_state = new_state;
1411}
1412
1413static void ab8500_fg_discharge_state_to(struct ab8500_fg *di,
1414 enum ab8500_fg_discharge_state new_state)
1415{
1416 dev_dbg(di->dev, "Disharge state from %d [%s] to %d [%s]\n",
1417 di->discharge_state,
1418 discharge_state[di->discharge_state],
1419 new_state,
1420 discharge_state[new_state]);
1421
1422 di->discharge_state = new_state;
1423}
1424
1425/**
1426 * ab8500_fg_algorithm_charging() - FG algorithm for when charging
1427 * @di: pointer to the ab8500_fg structure
1428 *
1429 * Battery capacity calculation state machine for when we're charging
1430 */
1431static void ab8500_fg_algorithm_charging(struct ab8500_fg *di)
1432{
1433 /*
1434 * If we change to discharge mode
1435 * we should start with recovery
1436 */
1437 if (di->discharge_state != AB8500_FG_DISCHARGE_INIT_RECOVERY)
1438 ab8500_fg_discharge_state_to(di,
1439 AB8500_FG_DISCHARGE_INIT_RECOVERY);
1440
1441 switch (di->charge_state) {
1442 case AB8500_FG_CHARGE_INIT:
1443 di->fg_samples = SEC_TO_SAMPLE(
1444 di->bm->fg_params->accu_charging);
1445
1446 ab8500_fg_coulomb_counter(di, true);
1447 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_READOUT);
1448
1449 break;
1450
1451 case AB8500_FG_CHARGE_READOUT:
1452 /*
1453 * Read the FG and calculate the new capacity
1454 */
1455 mutex_lock(&di->cc_lock);
1456 if (!di->flags.conv_done && !di->flags.force_full) {
1457 /* Wasn't the CC IRQ that got us here */
1458 mutex_unlock(&di->cc_lock);
1459 dev_dbg(di->dev, "%s CC conv not done\n",
1460 __func__);
1461
1462 break;
1463 }
1464 di->flags.conv_done = false;
1465 mutex_unlock(&di->cc_lock);
1466
1467 ab8500_fg_calc_cap_charging(di);
1468
1469 break;
1470
1471 default:
1472 break;
1473 }
1474
1475 /* Check capacity limits */
1476 ab8500_fg_check_capacity_limits(di, false);
1477}
1478
1479static void force_capacity(struct ab8500_fg *di)
1480{
1481 int cap;
1482
1483 ab8500_fg_clear_cap_samples(di);
1484 cap = di->bat_cap.user_mah;
1485 if (cap > di->bat_cap.max_mah_design) {
1486 dev_dbg(di->dev, "Remaining cap %d can't be bigger than total"
1487 " %d\n", cap, di->bat_cap.max_mah_design);
1488 cap = di->bat_cap.max_mah_design;
1489 }
1490 ab8500_fg_fill_cap_sample(di, di->bat_cap.user_mah);
1491 di->bat_cap.permille = ab8500_fg_convert_mah_to_permille(di, cap);
1492 di->bat_cap.mah = cap;
1493 ab8500_fg_check_capacity_limits(di, true);
1494}
1495
1496static bool check_sysfs_capacity(struct ab8500_fg *di)
1497{
1498 int cap, lower, upper;
1499 int cap_permille;
1500
1501 cap = di->bat_cap.user_mah;
1502
1503 cap_permille = ab8500_fg_convert_mah_to_permille(di,
1504 di->bat_cap.user_mah);
1505
1506 lower = di->bat_cap.permille - di->bm->fg_params->user_cap_limit * 10;
1507 upper = di->bat_cap.permille + di->bm->fg_params->user_cap_limit * 10;
1508
1509 if (lower < 0)
1510 lower = 0;
1511 /* 1000 is permille, -> 100 percent */
1512 if (upper > 1000)
1513 upper = 1000;
1514
1515 dev_dbg(di->dev, "Capacity limits:"
1516 " (Lower: %d User: %d Upper: %d) [user: %d, was: %d]\n",
1517 lower, cap_permille, upper, cap, di->bat_cap.mah);
1518
1519 /* If within limits, use the saved capacity and exit estimation...*/
1520 if (cap_permille > lower && cap_permille < upper) {
1521 dev_dbg(di->dev, "OK! Using users cap %d uAh now\n", cap);
1522 force_capacity(di);
1523 return true;
1524 }
1525 dev_dbg(di->dev, "Capacity from user out of limits, ignoring");
1526 return false;
1527}
1528
1529/**
1530 * ab8500_fg_algorithm_discharging() - FG algorithm for when discharging
1531 * @di: pointer to the ab8500_fg structure
1532 *
1533 * Battery capacity calculation state machine for when we're discharging
1534 */
1535static void ab8500_fg_algorithm_discharging(struct ab8500_fg *di)
1536{
1537 int sleep_time;
1538
1539 /* If we change to charge mode we should start with init */
1540 if (di->charge_state != AB8500_FG_CHARGE_INIT)
1541 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
1542
1543 switch (di->discharge_state) {
1544 case AB8500_FG_DISCHARGE_INIT:
1545 /* We use the FG IRQ to work on */
1546 di->init_cnt = 0;
1547 di->fg_samples = SEC_TO_SAMPLE(di->bm->fg_params->init_timer);
1548 ab8500_fg_coulomb_counter(di, true);
1549 ab8500_fg_discharge_state_to(di,
1550 AB8500_FG_DISCHARGE_INITMEASURING);
1551
1552 /* Intentional fallthrough */
1553 case AB8500_FG_DISCHARGE_INITMEASURING:
1554 /*
1555 * Discard a number of samples during startup.
1556 * After that, use compensated voltage for a few
1557 * samples to get an initial capacity.
1558 * Then go to READOUT
1559 */
1560 sleep_time = di->bm->fg_params->init_timer;
1561
1562 /* Discard the first [x] seconds */
1563 if (di->init_cnt > di->bm->fg_params->init_discard_time) {
1564 ab8500_fg_calc_cap_discharge_voltage(di, true);
1565
1566 ab8500_fg_check_capacity_limits(di, true);
1567 }
1568
1569 di->init_cnt += sleep_time;
1570 if (di->init_cnt > di->bm->fg_params->init_total_time)
1571 ab8500_fg_discharge_state_to(di,
1572 AB8500_FG_DISCHARGE_READOUT_INIT);
1573
1574 break;
1575
1576 case AB8500_FG_DISCHARGE_INIT_RECOVERY:
1577 di->recovery_cnt = 0;
1578 di->recovery_needed = true;
1579 ab8500_fg_discharge_state_to(di,
1580 AB8500_FG_DISCHARGE_RECOVERY);
1581
1582 /* Intentional fallthrough */
1583
1584 case AB8500_FG_DISCHARGE_RECOVERY:
1585 sleep_time = di->bm->fg_params->recovery_sleep_timer;
1586
1587 /*
1588 * We should check the power consumption
1589 * If low, go to READOUT (after x min) or
1590 * RECOVERY_SLEEP if time left.
1591 * If high, go to READOUT
1592 */
1593 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1594
1595 if (ab8500_fg_is_low_curr(di, di->inst_curr)) {
1596 if (di->recovery_cnt >
1597 di->bm->fg_params->recovery_total_time) {
1598 di->fg_samples = SEC_TO_SAMPLE(
1599 di->bm->fg_params->accu_high_curr);
1600 ab8500_fg_coulomb_counter(di, true);
1601 ab8500_fg_discharge_state_to(di,
1602 AB8500_FG_DISCHARGE_READOUT);
1603 di->recovery_needed = false;
1604 } else {
1605 queue_delayed_work(di->fg_wq,
1606 &di->fg_periodic_work,
1607 sleep_time * HZ);
1608 }
1609 di->recovery_cnt += sleep_time;
1610 } else {
1611 di->fg_samples = SEC_TO_SAMPLE(
1612 di->bm->fg_params->accu_high_curr);
1613 ab8500_fg_coulomb_counter(di, true);
1614 ab8500_fg_discharge_state_to(di,
1615 AB8500_FG_DISCHARGE_READOUT);
1616 }
1617 break;
1618
1619 case AB8500_FG_DISCHARGE_READOUT_INIT:
1620 di->fg_samples = SEC_TO_SAMPLE(
1621 di->bm->fg_params->accu_high_curr);
1622 ab8500_fg_coulomb_counter(di, true);
1623 ab8500_fg_discharge_state_to(di,
1624 AB8500_FG_DISCHARGE_READOUT);
1625 break;
1626
1627 case AB8500_FG_DISCHARGE_READOUT:
1628 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1629
1630 if (ab8500_fg_is_low_curr(di, di->inst_curr)) {
1631 /* Detect mode change */
1632 if (di->high_curr_mode) {
1633 di->high_curr_mode = false;
1634 di->high_curr_cnt = 0;
1635 }
1636
1637 if (di->recovery_needed) {
1638 ab8500_fg_discharge_state_to(di,
1639 AB8500_FG_DISCHARGE_INIT_RECOVERY);
1640
1641 queue_delayed_work(di->fg_wq,
1642 &di->fg_periodic_work, 0);
1643
1644 break;
1645 }
1646
1647 ab8500_fg_calc_cap_discharge_voltage(di, true);
1648 } else {
1649 mutex_lock(&di->cc_lock);
1650 if (!di->flags.conv_done) {
1651 /* Wasn't the CC IRQ that got us here */
1652 mutex_unlock(&di->cc_lock);
1653 dev_dbg(di->dev, "%s CC conv not done\n",
1654 __func__);
1655
1656 break;
1657 }
1658 di->flags.conv_done = false;
1659 mutex_unlock(&di->cc_lock);
1660
1661 /* Detect mode change */
1662 if (!di->high_curr_mode) {
1663 di->high_curr_mode = true;
1664 di->high_curr_cnt = 0;
1665 }
1666
1667 di->high_curr_cnt +=
1668 di->bm->fg_params->accu_high_curr;
1669 if (di->high_curr_cnt >
1670 di->bm->fg_params->high_curr_time)
1671 di->recovery_needed = true;
1672
1673 ab8500_fg_calc_cap_discharge_fg(di);
1674 }
1675
1676 ab8500_fg_check_capacity_limits(di, false);
1677
1678 break;
1679
1680 case AB8500_FG_DISCHARGE_WAKEUP:
1681 ab8500_fg_calc_cap_discharge_voltage(di, true);
1682
1683 di->fg_samples = SEC_TO_SAMPLE(
1684 di->bm->fg_params->accu_high_curr);
1685 ab8500_fg_coulomb_counter(di, true);
1686 ab8500_fg_discharge_state_to(di,
1687 AB8500_FG_DISCHARGE_READOUT);
1688
1689 ab8500_fg_check_capacity_limits(di, false);
1690
1691 break;
1692
1693 default:
1694 break;
1695 }
1696}
1697
1698/**
1699 * ab8500_fg_algorithm_calibrate() - Internal columb counter offset calibration
1700 * @di: pointer to the ab8500_fg structure
1701 *
1702 */
1703static void ab8500_fg_algorithm_calibrate(struct ab8500_fg *di)
1704{
1705 int ret;
1706
1707 switch (di->calib_state) {
1708 case AB8500_FG_CALIB_INIT:
1709 dev_dbg(di->dev, "Calibration ongoing...\n");
1710
1711 ret = abx500_mask_and_set_register_interruptible(di->dev,
1712 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1713 CC_INT_CAL_N_AVG_MASK, CC_INT_CAL_SAMPLES_8);
1714 if (ret < 0)
1715 goto err;
1716
1717 ret = abx500_mask_and_set_register_interruptible(di->dev,
1718 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1719 CC_INTAVGOFFSET_ENA, CC_INTAVGOFFSET_ENA);
1720 if (ret < 0)
1721 goto err;
1722 di->calib_state = AB8500_FG_CALIB_WAIT;
1723 break;
1724 case AB8500_FG_CALIB_END:
1725 ret = abx500_mask_and_set_register_interruptible(di->dev,
1726 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1727 CC_MUXOFFSET, CC_MUXOFFSET);
1728 if (ret < 0)
1729 goto err;
1730 di->flags.calibrate = false;
1731 dev_dbg(di->dev, "Calibration done...\n");
1732 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1733 break;
1734 case AB8500_FG_CALIB_WAIT:
1735 dev_dbg(di->dev, "Calibration WFI\n");
1736 default:
1737 break;
1738 }
1739 return;
1740err:
1741 /* Something went wrong, don't calibrate then */
1742 dev_err(di->dev, "failed to calibrate the CC\n");
1743 di->flags.calibrate = false;
1744 di->calib_state = AB8500_FG_CALIB_INIT;
1745 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1746}
1747
1748/**
1749 * ab8500_fg_algorithm() - Entry point for the FG algorithm
1750 * @di: pointer to the ab8500_fg structure
1751 *
1752 * Entry point for the battery capacity calculation state machine
1753 */
1754static void ab8500_fg_algorithm(struct ab8500_fg *di)
1755{
1756 if (di->flags.calibrate)
1757 ab8500_fg_algorithm_calibrate(di);
1758 else {
1759 if (di->flags.charging)
1760 ab8500_fg_algorithm_charging(di);
1761 else
1762 ab8500_fg_algorithm_discharging(di);
1763 }
1764
1765 dev_dbg(di->dev, "[FG_DATA] %d %d %d %d %d %d %d %d %d %d "
1766 "%d %d %d %d %d %d %d\n",
1767 di->bat_cap.max_mah_design,
1768 di->bat_cap.max_mah,
1769 di->bat_cap.mah,
1770 di->bat_cap.permille,
1771 di->bat_cap.level,
1772 di->bat_cap.prev_mah,
1773 di->bat_cap.prev_percent,
1774 di->bat_cap.prev_level,
1775 di->vbat,
1776 di->inst_curr,
1777 di->avg_curr,
1778 di->accu_charge,
1779 di->flags.charging,
1780 di->charge_state,
1781 di->discharge_state,
1782 di->high_curr_mode,
1783 di->recovery_needed);
1784}
1785
1786/**
1787 * ab8500_fg_periodic_work() - Run the FG state machine periodically
1788 * @work: pointer to the work_struct structure
1789 *
1790 * Work queue function for periodic work
1791 */
1792static void ab8500_fg_periodic_work(struct work_struct *work)
1793{
1794 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1795 fg_periodic_work.work);
1796
1797 if (di->init_capacity) {
1798 /* Get an initial capacity calculation */
1799 ab8500_fg_calc_cap_discharge_voltage(di, true);
1800 ab8500_fg_check_capacity_limits(di, true);
1801 di->init_capacity = false;
1802
1803 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1804 } else if (di->flags.user_cap) {
1805 if (check_sysfs_capacity(di)) {
1806 ab8500_fg_check_capacity_limits(di, true);
1807 if (di->flags.charging)
1808 ab8500_fg_charge_state_to(di,
1809 AB8500_FG_CHARGE_INIT);
1810 else
1811 ab8500_fg_discharge_state_to(di,
1812 AB8500_FG_DISCHARGE_READOUT_INIT);
1813 }
1814 di->flags.user_cap = false;
1815 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1816 } else
1817 ab8500_fg_algorithm(di);
1818
1819}
1820
1821/**
1822 * ab8500_fg_check_hw_failure_work() - Check OVV_BAT condition
1823 * @work: pointer to the work_struct structure
1824 *
1825 * Work queue function for checking the OVV_BAT condition
1826 */
1827static void ab8500_fg_check_hw_failure_work(struct work_struct *work)
1828{
1829 int ret;
1830 u8 reg_value;
1831
1832 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1833 fg_check_hw_failure_work.work);
1834
1835 /*
1836 * If we have had a battery over-voltage situation,
1837 * check ovv-bit to see if it should be reset.
1838 */
1839 ret = abx500_get_register_interruptible(di->dev,
1840 AB8500_CHARGER, AB8500_CH_STAT_REG,
1841 ®_value);
1842 if (ret < 0) {
1843 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1844 return;
1845 }
1846 if ((reg_value & BATT_OVV) == BATT_OVV) {
1847 if (!di->flags.bat_ovv) {
1848 dev_dbg(di->dev, "Battery OVV\n");
1849 di->flags.bat_ovv = true;
1850 power_supply_changed(di->fg_psy);
1851 }
1852 /* Not yet recovered from ovv, reschedule this test */
1853 queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work,
1854 HZ);
1855 } else {
1856 dev_dbg(di->dev, "Battery recovered from OVV\n");
1857 di->flags.bat_ovv = false;
1858 power_supply_changed(di->fg_psy);
1859 }
1860}
1861
1862/**
1863 * ab8500_fg_low_bat_work() - Check LOW_BAT condition
1864 * @work: pointer to the work_struct structure
1865 *
1866 * Work queue function for checking the LOW_BAT condition
1867 */
1868static void ab8500_fg_low_bat_work(struct work_struct *work)
1869{
1870 int vbat;
1871
1872 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1873 fg_low_bat_work.work);
1874
1875 vbat = ab8500_fg_bat_voltage(di);
1876
1877 /* Check if LOW_BAT still fulfilled */
1878 if (vbat < di->bm->fg_params->lowbat_threshold) {
1879 /* Is it time to shut down? */
1880 if (di->low_bat_cnt < 1) {
1881 di->flags.low_bat = true;
1882 dev_warn(di->dev, "Shut down pending...\n");
1883 } else {
1884 /*
1885 * Else we need to re-schedule this check to be able to detect
1886 * if the voltage increases again during charging or
1887 * due to decreasing load.
1888 */
1889 di->low_bat_cnt--;
1890 dev_warn(di->dev, "Battery voltage still LOW\n");
1891 queue_delayed_work(di->fg_wq, &di->fg_low_bat_work,
1892 round_jiffies(LOW_BAT_CHECK_INTERVAL));
1893 }
1894 } else {
1895 di->flags.low_bat_delay = false;
1896 di->low_bat_cnt = 10;
1897 dev_warn(di->dev, "Battery voltage OK again\n");
1898 }
1899
1900 /* This is needed to dispatch LOW_BAT */
1901 ab8500_fg_check_capacity_limits(di, false);
1902}
1903
1904/**
1905 * ab8500_fg_battok_calc - calculate the bit pattern corresponding
1906 * to the target voltage.
1907 * @di: pointer to the ab8500_fg structure
1908 * @target target voltage
1909 *
1910 * Returns bit pattern closest to the target voltage
1911 * valid return values are 0-14. (0-BATT_OK_MAX_NR_INCREMENTS)
1912 */
1913
1914static int ab8500_fg_battok_calc(struct ab8500_fg *di, int target)
1915{
1916 if (target > BATT_OK_MIN +
1917 (BATT_OK_INCREMENT * BATT_OK_MAX_NR_INCREMENTS))
1918 return BATT_OK_MAX_NR_INCREMENTS;
1919 if (target < BATT_OK_MIN)
1920 return 0;
1921 return (target - BATT_OK_MIN) / BATT_OK_INCREMENT;
1922}
1923
1924/**
1925 * ab8500_fg_battok_init_hw_register - init battok levels
1926 * @di: pointer to the ab8500_fg structure
1927 *
1928 */
1929
1930static int ab8500_fg_battok_init_hw_register(struct ab8500_fg *di)
1931{
1932 int selected;
1933 int sel0;
1934 int sel1;
1935 int cbp_sel0;
1936 int cbp_sel1;
1937 int ret;
1938 int new_val;
1939
1940 sel0 = di->bm->fg_params->battok_falling_th_sel0;
1941 sel1 = di->bm->fg_params->battok_raising_th_sel1;
1942
1943 cbp_sel0 = ab8500_fg_battok_calc(di, sel0);
1944 cbp_sel1 = ab8500_fg_battok_calc(di, sel1);
1945
1946 selected = BATT_OK_MIN + cbp_sel0 * BATT_OK_INCREMENT;
1947
1948 if (selected != sel0)
1949 dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n",
1950 sel0, selected, cbp_sel0);
1951
1952 selected = BATT_OK_MIN + cbp_sel1 * BATT_OK_INCREMENT;
1953
1954 if (selected != sel1)
1955 dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n",
1956 sel1, selected, cbp_sel1);
1957
1958 new_val = cbp_sel0 | (cbp_sel1 << 4);
1959
1960 dev_dbg(di->dev, "using: %x %d %d\n", new_val, cbp_sel0, cbp_sel1);
1961 ret = abx500_set_register_interruptible(di->dev, AB8500_SYS_CTRL2_BLOCK,
1962 AB8500_BATT_OK_REG, new_val);
1963 return ret;
1964}
1965
1966/**
1967 * ab8500_fg_instant_work() - Run the FG state machine instantly
1968 * @work: pointer to the work_struct structure
1969 *
1970 * Work queue function for instant work
1971 */
1972static void ab8500_fg_instant_work(struct work_struct *work)
1973{
1974 struct ab8500_fg *di = container_of(work, struct ab8500_fg, fg_work);
1975
1976 ab8500_fg_algorithm(di);
1977}
1978
1979/**
1980 * ab8500_fg_cc_data_end_handler() - end of data conversion isr.
1981 * @irq: interrupt number
1982 * @_di: pointer to the ab8500_fg structure
1983 *
1984 * Returns IRQ status(IRQ_HANDLED)
1985 */
1986static irqreturn_t ab8500_fg_cc_data_end_handler(int irq, void *_di)
1987{
1988 struct ab8500_fg *di = _di;
1989 if (!di->nbr_cceoc_irq_cnt) {
1990 di->nbr_cceoc_irq_cnt++;
1991 complete(&di->ab8500_fg_started);
1992 } else {
1993 di->nbr_cceoc_irq_cnt = 0;
1994 complete(&di->ab8500_fg_complete);
1995 }
1996 return IRQ_HANDLED;
1997}
1998
1999/**
2000 * ab8500_fg_cc_int_calib_handler () - end of calibration isr.
2001 * @irq: interrupt number
2002 * @_di: pointer to the ab8500_fg structure
2003 *
2004 * Returns IRQ status(IRQ_HANDLED)
2005 */
2006static irqreturn_t ab8500_fg_cc_int_calib_handler(int irq, void *_di)
2007{
2008 struct ab8500_fg *di = _di;
2009 di->calib_state = AB8500_FG_CALIB_END;
2010 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2011 return IRQ_HANDLED;
2012}
2013
2014/**
2015 * ab8500_fg_cc_convend_handler() - isr to get battery avg current.
2016 * @irq: interrupt number
2017 * @_di: pointer to the ab8500_fg structure
2018 *
2019 * Returns IRQ status(IRQ_HANDLED)
2020 */
2021static irqreturn_t ab8500_fg_cc_convend_handler(int irq, void *_di)
2022{
2023 struct ab8500_fg *di = _di;
2024
2025 queue_work(di->fg_wq, &di->fg_acc_cur_work);
2026
2027 return IRQ_HANDLED;
2028}
2029
2030/**
2031 * ab8500_fg_batt_ovv_handler() - Battery OVV occured
2032 * @irq: interrupt number
2033 * @_di: pointer to the ab8500_fg structure
2034 *
2035 * Returns IRQ status(IRQ_HANDLED)
2036 */
2037static irqreturn_t ab8500_fg_batt_ovv_handler(int irq, void *_di)
2038{
2039 struct ab8500_fg *di = _di;
2040
2041 dev_dbg(di->dev, "Battery OVV\n");
2042
2043 /* Schedule a new HW failure check */
2044 queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work, 0);
2045
2046 return IRQ_HANDLED;
2047}
2048
2049/**
2050 * ab8500_fg_lowbatf_handler() - Battery voltage is below LOW threshold
2051 * @irq: interrupt number
2052 * @_di: pointer to the ab8500_fg structure
2053 *
2054 * Returns IRQ status(IRQ_HANDLED)
2055 */
2056static irqreturn_t ab8500_fg_lowbatf_handler(int irq, void *_di)
2057{
2058 struct ab8500_fg *di = _di;
2059
2060 /* Initiate handling in ab8500_fg_low_bat_work() if not already initiated. */
2061 if (!di->flags.low_bat_delay) {
2062 dev_warn(di->dev, "Battery voltage is below LOW threshold\n");
2063 di->flags.low_bat_delay = true;
2064 /*
2065 * Start a timer to check LOW_BAT again after some time
2066 * This is done to avoid shutdown on single voltage dips
2067 */
2068 queue_delayed_work(di->fg_wq, &di->fg_low_bat_work,
2069 round_jiffies(LOW_BAT_CHECK_INTERVAL));
2070 }
2071 return IRQ_HANDLED;
2072}
2073
2074/**
2075 * ab8500_fg_get_property() - get the fg properties
2076 * @psy: pointer to the power_supply structure
2077 * @psp: pointer to the power_supply_property structure
2078 * @val: pointer to the power_supply_propval union
2079 *
2080 * This function gets called when an application tries to get the
2081 * fg properties by reading the sysfs files.
2082 * voltage_now: battery voltage
2083 * current_now: battery instant current
2084 * current_avg: battery average current
2085 * charge_full_design: capacity where battery is considered full
2086 * charge_now: battery capacity in nAh
2087 * capacity: capacity in percent
2088 * capacity_level: capacity level
2089 *
2090 * Returns error code in case of failure else 0 on success
2091 */
2092static int ab8500_fg_get_property(struct power_supply *psy,
2093 enum power_supply_property psp,
2094 union power_supply_propval *val)
2095{
2096 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2097
2098 /*
2099 * If battery is identified as unknown and charging of unknown
2100 * batteries is disabled, we always report 100% capacity and
2101 * capacity level UNKNOWN, since we can't calculate
2102 * remaining capacity
2103 */
2104
2105 switch (psp) {
2106 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
2107 if (di->flags.bat_ovv)
2108 val->intval = BATT_OVV_VALUE * 1000;
2109 else
2110 val->intval = di->vbat * 1000;
2111 break;
2112 case POWER_SUPPLY_PROP_CURRENT_NOW:
2113 val->intval = di->inst_curr * 1000;
2114 break;
2115 case POWER_SUPPLY_PROP_CURRENT_AVG:
2116 val->intval = di->avg_curr * 1000;
2117 break;
2118 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
2119 val->intval = ab8500_fg_convert_mah_to_uwh(di,
2120 di->bat_cap.max_mah_design);
2121 break;
2122 case POWER_SUPPLY_PROP_ENERGY_FULL:
2123 val->intval = ab8500_fg_convert_mah_to_uwh(di,
2124 di->bat_cap.max_mah);
2125 break;
2126 case POWER_SUPPLY_PROP_ENERGY_NOW:
2127 if (di->flags.batt_unknown && !di->bm->chg_unknown_bat &&
2128 di->flags.batt_id_received)
2129 val->intval = ab8500_fg_convert_mah_to_uwh(di,
2130 di->bat_cap.max_mah);
2131 else
2132 val->intval = ab8500_fg_convert_mah_to_uwh(di,
2133 di->bat_cap.prev_mah);
2134 break;
2135 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
2136 val->intval = di->bat_cap.max_mah_design;
2137 break;
2138 case POWER_SUPPLY_PROP_CHARGE_FULL:
2139 val->intval = di->bat_cap.max_mah;
2140 break;
2141 case POWER_SUPPLY_PROP_CHARGE_NOW:
2142 if (di->flags.batt_unknown && !di->bm->chg_unknown_bat &&
2143 di->flags.batt_id_received)
2144 val->intval = di->bat_cap.max_mah;
2145 else
2146 val->intval = di->bat_cap.prev_mah;
2147 break;
2148 case POWER_SUPPLY_PROP_CAPACITY:
2149 if (di->flags.batt_unknown && !di->bm->chg_unknown_bat &&
2150 di->flags.batt_id_received)
2151 val->intval = 100;
2152 else
2153 val->intval = di->bat_cap.prev_percent;
2154 break;
2155 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
2156 if (di->flags.batt_unknown && !di->bm->chg_unknown_bat &&
2157 di->flags.batt_id_received)
2158 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
2159 else
2160 val->intval = di->bat_cap.prev_level;
2161 break;
2162 default:
2163 return -EINVAL;
2164 }
2165 return 0;
2166}
2167
2168static int ab8500_fg_get_ext_psy_data(struct device *dev, void *data)
2169{
2170 struct power_supply *psy;
2171 struct power_supply *ext = dev_get_drvdata(dev);
2172 const char **supplicants = (const char **)ext->supplied_to;
2173 struct ab8500_fg *di;
2174 union power_supply_propval ret;
2175 int j;
2176
2177 psy = (struct power_supply *)data;
2178 di = power_supply_get_drvdata(psy);
2179
2180 /*
2181 * For all psy where the name of your driver
2182 * appears in any supplied_to
2183 */
2184 j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
2185 if (j < 0)
2186 return 0;
2187
2188 /* Go through all properties for the psy */
2189 for (j = 0; j < ext->desc->num_properties; j++) {
2190 enum power_supply_property prop;
2191 prop = ext->desc->properties[j];
2192
2193 if (power_supply_get_property(ext, prop, &ret))
2194 continue;
2195
2196 switch (prop) {
2197 case POWER_SUPPLY_PROP_STATUS:
2198 switch (ext->desc->type) {
2199 case POWER_SUPPLY_TYPE_BATTERY:
2200 switch (ret.intval) {
2201 case POWER_SUPPLY_STATUS_UNKNOWN:
2202 case POWER_SUPPLY_STATUS_DISCHARGING:
2203 case POWER_SUPPLY_STATUS_NOT_CHARGING:
2204 if (!di->flags.charging)
2205 break;
2206 di->flags.charging = false;
2207 di->flags.fully_charged = false;
2208 if (di->bm->capacity_scaling)
2209 ab8500_fg_update_cap_scalers(di);
2210 queue_work(di->fg_wq, &di->fg_work);
2211 break;
2212 case POWER_SUPPLY_STATUS_FULL:
2213 if (di->flags.fully_charged)
2214 break;
2215 di->flags.fully_charged = true;
2216 di->flags.force_full = true;
2217 /* Save current capacity as maximum */
2218 di->bat_cap.max_mah = di->bat_cap.mah;
2219 queue_work(di->fg_wq, &di->fg_work);
2220 break;
2221 case POWER_SUPPLY_STATUS_CHARGING:
2222 if (di->flags.charging &&
2223 !di->flags.fully_charged)
2224 break;
2225 di->flags.charging = true;
2226 di->flags.fully_charged = false;
2227 if (di->bm->capacity_scaling)
2228 ab8500_fg_update_cap_scalers(di);
2229 queue_work(di->fg_wq, &di->fg_work);
2230 break;
2231 };
2232 default:
2233 break;
2234 };
2235 break;
2236 case POWER_SUPPLY_PROP_TECHNOLOGY:
2237 switch (ext->desc->type) {
2238 case POWER_SUPPLY_TYPE_BATTERY:
2239 if (!di->flags.batt_id_received &&
2240 di->bm->batt_id != BATTERY_UNKNOWN) {
2241 const struct abx500_battery_type *b;
2242
2243 b = &(di->bm->bat_type[di->bm->batt_id]);
2244
2245 di->flags.batt_id_received = true;
2246
2247 di->bat_cap.max_mah_design =
2248 MILLI_TO_MICRO *
2249 b->charge_full_design;
2250
2251 di->bat_cap.max_mah =
2252 di->bat_cap.max_mah_design;
2253
2254 di->vbat_nom = b->nominal_voltage;
2255 }
2256
2257 if (ret.intval)
2258 di->flags.batt_unknown = false;
2259 else
2260 di->flags.batt_unknown = true;
2261 break;
2262 default:
2263 break;
2264 }
2265 break;
2266 case POWER_SUPPLY_PROP_TEMP:
2267 switch (ext->desc->type) {
2268 case POWER_SUPPLY_TYPE_BATTERY:
2269 if (di->flags.batt_id_received)
2270 di->bat_temp = ret.intval;
2271 break;
2272 default:
2273 break;
2274 }
2275 break;
2276 default:
2277 break;
2278 }
2279 }
2280 return 0;
2281}
2282
2283/**
2284 * ab8500_fg_init_hw_registers() - Set up FG related registers
2285 * @di: pointer to the ab8500_fg structure
2286 *
2287 * Set up battery OVV, low battery voltage registers
2288 */
2289static int ab8500_fg_init_hw_registers(struct ab8500_fg *di)
2290{
2291 int ret;
2292
2293 /* Set VBAT OVV threshold */
2294 ret = abx500_mask_and_set_register_interruptible(di->dev,
2295 AB8500_CHARGER,
2296 AB8500_BATT_OVV,
2297 BATT_OVV_TH_4P75,
2298 BATT_OVV_TH_4P75);
2299 if (ret) {
2300 dev_err(di->dev, "failed to set BATT_OVV\n");
2301 goto out;
2302 }
2303
2304 /* Enable VBAT OVV detection */
2305 ret = abx500_mask_and_set_register_interruptible(di->dev,
2306 AB8500_CHARGER,
2307 AB8500_BATT_OVV,
2308 BATT_OVV_ENA,
2309 BATT_OVV_ENA);
2310 if (ret) {
2311 dev_err(di->dev, "failed to enable BATT_OVV\n");
2312 goto out;
2313 }
2314
2315 /* Low Battery Voltage */
2316 ret = abx500_set_register_interruptible(di->dev,
2317 AB8500_SYS_CTRL2_BLOCK,
2318 AB8500_LOW_BAT_REG,
2319 ab8500_volt_to_regval(
2320 di->bm->fg_params->lowbat_threshold) << 1 |
2321 LOW_BAT_ENABLE);
2322 if (ret) {
2323 dev_err(di->dev, "%s write failed\n", __func__);
2324 goto out;
2325 }
2326
2327 /* Battery OK threshold */
2328 ret = ab8500_fg_battok_init_hw_register(di);
2329 if (ret) {
2330 dev_err(di->dev, "BattOk init write failed.\n");
2331 goto out;
2332 }
2333
2334 if (((is_ab8505(di->parent) || is_ab9540(di->parent)) &&
2335 abx500_get_chip_id(di->dev) >= AB8500_CUT2P0)
2336 || is_ab8540(di->parent)) {
2337 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2338 AB8505_RTC_PCUT_MAX_TIME_REG, di->bm->fg_params->pcut_max_time);
2339
2340 if (ret) {
2341 dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_MAX_TIME_REG\n", __func__);
2342 goto out;
2343 };
2344
2345 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2346 AB8505_RTC_PCUT_FLAG_TIME_REG, di->bm->fg_params->pcut_flag_time);
2347
2348 if (ret) {
2349 dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_FLAG_TIME_REG\n", __func__);
2350 goto out;
2351 };
2352
2353 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2354 AB8505_RTC_PCUT_RESTART_REG, di->bm->fg_params->pcut_max_restart);
2355
2356 if (ret) {
2357 dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_RESTART_REG\n", __func__);
2358 goto out;
2359 };
2360
2361 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2362 AB8505_RTC_PCUT_DEBOUNCE_REG, di->bm->fg_params->pcut_debounce_time);
2363
2364 if (ret) {
2365 dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_DEBOUNCE_REG\n", __func__);
2366 goto out;
2367 };
2368
2369 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2370 AB8505_RTC_PCUT_CTL_STATUS_REG, di->bm->fg_params->pcut_enable);
2371
2372 if (ret) {
2373 dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_CTL_STATUS_REG\n", __func__);
2374 goto out;
2375 };
2376 }
2377out:
2378 return ret;
2379}
2380
2381/**
2382 * ab8500_fg_external_power_changed() - callback for power supply changes
2383 * @psy: pointer to the structure power_supply
2384 *
2385 * This function is the entry point of the pointer external_power_changed
2386 * of the structure power_supply.
2387 * This function gets executed when there is a change in any external power
2388 * supply that this driver needs to be notified of.
2389 */
2390static void ab8500_fg_external_power_changed(struct power_supply *psy)
2391{
2392 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2393
2394 class_for_each_device(power_supply_class, NULL,
2395 di->fg_psy, ab8500_fg_get_ext_psy_data);
2396}
2397
2398/**
2399 * abab8500_fg_reinit_work() - work to reset the FG algorithm
2400 * @work: pointer to the work_struct structure
2401 *
2402 * Used to reset the current battery capacity to be able to
2403 * retrigger a new voltage base capacity calculation. For
2404 * test and verification purpose.
2405 */
2406static void ab8500_fg_reinit_work(struct work_struct *work)
2407{
2408 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
2409 fg_reinit_work.work);
2410
2411 if (di->flags.calibrate == false) {
2412 dev_dbg(di->dev, "Resetting FG state machine to init.\n");
2413 ab8500_fg_clear_cap_samples(di);
2414 ab8500_fg_calc_cap_discharge_voltage(di, true);
2415 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
2416 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT);
2417 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2418
2419 } else {
2420 dev_err(di->dev, "Residual offset calibration ongoing "
2421 "retrying..\n");
2422 /* Wait one second until next try*/
2423 queue_delayed_work(di->fg_wq, &di->fg_reinit_work,
2424 round_jiffies(1));
2425 }
2426}
2427
2428/* Exposure to the sysfs interface */
2429
2430struct ab8500_fg_sysfs_entry {
2431 struct attribute attr;
2432 ssize_t (*show)(struct ab8500_fg *, char *);
2433 ssize_t (*store)(struct ab8500_fg *, const char *, size_t);
2434};
2435
2436static ssize_t charge_full_show(struct ab8500_fg *di, char *buf)
2437{
2438 return sprintf(buf, "%d\n", di->bat_cap.max_mah);
2439}
2440
2441static ssize_t charge_full_store(struct ab8500_fg *di, const char *buf,
2442 size_t count)
2443{
2444 unsigned long charge_full;
2445 ssize_t ret;
2446
2447 ret = kstrtoul(buf, 10, &charge_full);
2448
2449 dev_dbg(di->dev, "Ret %zd charge_full %lu", ret, charge_full);
2450
2451 if (!ret) {
2452 di->bat_cap.max_mah = (int) charge_full;
2453 ret = count;
2454 }
2455 return ret;
2456}
2457
2458static ssize_t charge_now_show(struct ab8500_fg *di, char *buf)
2459{
2460 return sprintf(buf, "%d\n", di->bat_cap.prev_mah);
2461}
2462
2463static ssize_t charge_now_store(struct ab8500_fg *di, const char *buf,
2464 size_t count)
2465{
2466 unsigned long charge_now;
2467 ssize_t ret;
2468
2469 ret = kstrtoul(buf, 10, &charge_now);
2470
2471 dev_dbg(di->dev, "Ret %zd charge_now %lu was %d",
2472 ret, charge_now, di->bat_cap.prev_mah);
2473
2474 if (!ret) {
2475 di->bat_cap.user_mah = (int) charge_now;
2476 di->flags.user_cap = true;
2477 ret = count;
2478 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2479 }
2480 return ret;
2481}
2482
2483static struct ab8500_fg_sysfs_entry charge_full_attr =
2484 __ATTR(charge_full, 0644, charge_full_show, charge_full_store);
2485
2486static struct ab8500_fg_sysfs_entry charge_now_attr =
2487 __ATTR(charge_now, 0644, charge_now_show, charge_now_store);
2488
2489static ssize_t
2490ab8500_fg_show(struct kobject *kobj, struct attribute *attr, char *buf)
2491{
2492 struct ab8500_fg_sysfs_entry *entry;
2493 struct ab8500_fg *di;
2494
2495 entry = container_of(attr, struct ab8500_fg_sysfs_entry, attr);
2496 di = container_of(kobj, struct ab8500_fg, fg_kobject);
2497
2498 if (!entry->show)
2499 return -EIO;
2500
2501 return entry->show(di, buf);
2502}
2503static ssize_t
2504ab8500_fg_store(struct kobject *kobj, struct attribute *attr, const char *buf,
2505 size_t count)
2506{
2507 struct ab8500_fg_sysfs_entry *entry;
2508 struct ab8500_fg *di;
2509
2510 entry = container_of(attr, struct ab8500_fg_sysfs_entry, attr);
2511 di = container_of(kobj, struct ab8500_fg, fg_kobject);
2512
2513 if (!entry->store)
2514 return -EIO;
2515
2516 return entry->store(di, buf, count);
2517}
2518
2519static const struct sysfs_ops ab8500_fg_sysfs_ops = {
2520 .show = ab8500_fg_show,
2521 .store = ab8500_fg_store,
2522};
2523
2524static struct attribute *ab8500_fg_attrs[] = {
2525 &charge_full_attr.attr,
2526 &charge_now_attr.attr,
2527 NULL,
2528};
2529
2530static struct kobj_type ab8500_fg_ktype = {
2531 .sysfs_ops = &ab8500_fg_sysfs_ops,
2532 .default_attrs = ab8500_fg_attrs,
2533};
2534
2535/**
2536 * ab8500_chargalg_sysfs_exit() - de-init of sysfs entry
2537 * @di: pointer to the struct ab8500_chargalg
2538 *
2539 * This function removes the entry in sysfs.
2540 */
2541static void ab8500_fg_sysfs_exit(struct ab8500_fg *di)
2542{
2543 kobject_del(&di->fg_kobject);
2544}
2545
2546/**
2547 * ab8500_chargalg_sysfs_init() - init of sysfs entry
2548 * @di: pointer to the struct ab8500_chargalg
2549 *
2550 * This function adds an entry in sysfs.
2551 * Returns error code in case of failure else 0(on success)
2552 */
2553static int ab8500_fg_sysfs_init(struct ab8500_fg *di)
2554{
2555 int ret = 0;
2556
2557 ret = kobject_init_and_add(&di->fg_kobject,
2558 &ab8500_fg_ktype,
2559 NULL, "battery");
2560 if (ret < 0)
2561 dev_err(di->dev, "failed to create sysfs entry\n");
2562
2563 return ret;
2564}
2565
2566static ssize_t ab8505_powercut_flagtime_read(struct device *dev,
2567 struct device_attribute *attr,
2568 char *buf)
2569{
2570 int ret;
2571 u8 reg_value;
2572 struct power_supply *psy = dev_get_drvdata(dev);
2573 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2574
2575 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2576 AB8505_RTC_PCUT_FLAG_TIME_REG, ®_value);
2577
2578 if (ret < 0) {
2579 dev_err(dev, "Failed to read AB8505_RTC_PCUT_FLAG_TIME_REG\n");
2580 goto fail;
2581 }
2582
2583 return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7F));
2584
2585fail:
2586 return ret;
2587}
2588
2589static ssize_t ab8505_powercut_flagtime_write(struct device *dev,
2590 struct device_attribute *attr,
2591 const char *buf, size_t count)
2592{
2593 int ret;
2594 long unsigned reg_value;
2595 struct power_supply *psy = dev_get_drvdata(dev);
2596 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2597
2598 reg_value = simple_strtoul(buf, NULL, 10);
2599
2600 if (reg_value > 0x7F) {
2601 dev_err(dev, "Incorrect parameter, echo 0 (1.98s) - 127 (15.625ms) for flagtime\n");
2602 goto fail;
2603 }
2604
2605 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2606 AB8505_RTC_PCUT_FLAG_TIME_REG, (u8)reg_value);
2607
2608 if (ret < 0)
2609 dev_err(dev, "Failed to set AB8505_RTC_PCUT_FLAG_TIME_REG\n");
2610
2611fail:
2612 return count;
2613}
2614
2615static ssize_t ab8505_powercut_maxtime_read(struct device *dev,
2616 struct device_attribute *attr,
2617 char *buf)
2618{
2619 int ret;
2620 u8 reg_value;
2621 struct power_supply *psy = dev_get_drvdata(dev);
2622 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2623
2624 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2625 AB8505_RTC_PCUT_MAX_TIME_REG, ®_value);
2626
2627 if (ret < 0) {
2628 dev_err(dev, "Failed to read AB8505_RTC_PCUT_MAX_TIME_REG\n");
2629 goto fail;
2630 }
2631
2632 return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7F));
2633
2634fail:
2635 return ret;
2636
2637}
2638
2639static ssize_t ab8505_powercut_maxtime_write(struct device *dev,
2640 struct device_attribute *attr,
2641 const char *buf, size_t count)
2642{
2643 int ret;
2644 int reg_value;
2645 struct power_supply *psy = dev_get_drvdata(dev);
2646 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2647
2648 reg_value = simple_strtoul(buf, NULL, 10);
2649 if (reg_value > 0x7F) {
2650 dev_err(dev, "Incorrect parameter, echo 0 (0.0s) - 127 (1.98s) for maxtime\n");
2651 goto fail;
2652 }
2653
2654 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2655 AB8505_RTC_PCUT_MAX_TIME_REG, (u8)reg_value);
2656
2657 if (ret < 0)
2658 dev_err(dev, "Failed to set AB8505_RTC_PCUT_MAX_TIME_REG\n");
2659
2660fail:
2661 return count;
2662}
2663
2664static ssize_t ab8505_powercut_restart_read(struct device *dev,
2665 struct device_attribute *attr,
2666 char *buf)
2667{
2668 int ret;
2669 u8 reg_value;
2670 struct power_supply *psy = dev_get_drvdata(dev);
2671 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2672
2673 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2674 AB8505_RTC_PCUT_RESTART_REG, ®_value);
2675
2676 if (ret < 0) {
2677 dev_err(dev, "Failed to read AB8505_RTC_PCUT_RESTART_REG\n");
2678 goto fail;
2679 }
2680
2681 return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0xF));
2682
2683fail:
2684 return ret;
2685}
2686
2687static ssize_t ab8505_powercut_restart_write(struct device *dev,
2688 struct device_attribute *attr,
2689 const char *buf, size_t count)
2690{
2691 int ret;
2692 int reg_value;
2693 struct power_supply *psy = dev_get_drvdata(dev);
2694 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2695
2696 reg_value = simple_strtoul(buf, NULL, 10);
2697 if (reg_value > 0xF) {
2698 dev_err(dev, "Incorrect parameter, echo 0 - 15 for number of restart\n");
2699 goto fail;
2700 }
2701
2702 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2703 AB8505_RTC_PCUT_RESTART_REG, (u8)reg_value);
2704
2705 if (ret < 0)
2706 dev_err(dev, "Failed to set AB8505_RTC_PCUT_RESTART_REG\n");
2707
2708fail:
2709 return count;
2710
2711}
2712
2713static ssize_t ab8505_powercut_timer_read(struct device *dev,
2714 struct device_attribute *attr,
2715 char *buf)
2716{
2717 int ret;
2718 u8 reg_value;
2719 struct power_supply *psy = dev_get_drvdata(dev);
2720 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2721
2722 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2723 AB8505_RTC_PCUT_TIME_REG, ®_value);
2724
2725 if (ret < 0) {
2726 dev_err(dev, "Failed to read AB8505_RTC_PCUT_TIME_REG\n");
2727 goto fail;
2728 }
2729
2730 return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7F));
2731
2732fail:
2733 return ret;
2734}
2735
2736static ssize_t ab8505_powercut_restart_counter_read(struct device *dev,
2737 struct device_attribute *attr,
2738 char *buf)
2739{
2740 int ret;
2741 u8 reg_value;
2742 struct power_supply *psy = dev_get_drvdata(dev);
2743 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2744
2745 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2746 AB8505_RTC_PCUT_RESTART_REG, ®_value);
2747
2748 if (ret < 0) {
2749 dev_err(dev, "Failed to read AB8505_RTC_PCUT_RESTART_REG\n");
2750 goto fail;
2751 }
2752
2753 return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0xF0) >> 4);
2754
2755fail:
2756 return ret;
2757}
2758
2759static ssize_t ab8505_powercut_read(struct device *dev,
2760 struct device_attribute *attr,
2761 char *buf)
2762{
2763 int ret;
2764 u8 reg_value;
2765 struct power_supply *psy = dev_get_drvdata(dev);
2766 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2767
2768 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2769 AB8505_RTC_PCUT_CTL_STATUS_REG, ®_value);
2770
2771 if (ret < 0)
2772 goto fail;
2773
2774 return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x1));
2775
2776fail:
2777 return ret;
2778}
2779
2780static ssize_t ab8505_powercut_write(struct device *dev,
2781 struct device_attribute *attr,
2782 const char *buf, size_t count)
2783{
2784 int ret;
2785 int reg_value;
2786 struct power_supply *psy = dev_get_drvdata(dev);
2787 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2788
2789 reg_value = simple_strtoul(buf, NULL, 10);
2790 if (reg_value > 0x1) {
2791 dev_err(dev, "Incorrect parameter, echo 0/1 to disable/enable Pcut feature\n");
2792 goto fail;
2793 }
2794
2795 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2796 AB8505_RTC_PCUT_CTL_STATUS_REG, (u8)reg_value);
2797
2798 if (ret < 0)
2799 dev_err(dev, "Failed to set AB8505_RTC_PCUT_CTL_STATUS_REG\n");
2800
2801fail:
2802 return count;
2803}
2804
2805static ssize_t ab8505_powercut_flag_read(struct device *dev,
2806 struct device_attribute *attr,
2807 char *buf)
2808{
2809
2810 int ret;
2811 u8 reg_value;
2812 struct power_supply *psy = dev_get_drvdata(dev);
2813 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2814
2815 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2816 AB8505_RTC_PCUT_CTL_STATUS_REG, ®_value);
2817
2818 if (ret < 0) {
2819 dev_err(dev, "Failed to read AB8505_RTC_PCUT_CTL_STATUS_REG\n");
2820 goto fail;
2821 }
2822
2823 return scnprintf(buf, PAGE_SIZE, "%d\n", ((reg_value & 0x10) >> 4));
2824
2825fail:
2826 return ret;
2827}
2828
2829static ssize_t ab8505_powercut_debounce_read(struct device *dev,
2830 struct device_attribute *attr,
2831 char *buf)
2832{
2833 int ret;
2834 u8 reg_value;
2835 struct power_supply *psy = dev_get_drvdata(dev);
2836 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2837
2838 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2839 AB8505_RTC_PCUT_DEBOUNCE_REG, ®_value);
2840
2841 if (ret < 0) {
2842 dev_err(dev, "Failed to read AB8505_RTC_PCUT_DEBOUNCE_REG\n");
2843 goto fail;
2844 }
2845
2846 return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7));
2847
2848fail:
2849 return ret;
2850}
2851
2852static ssize_t ab8505_powercut_debounce_write(struct device *dev,
2853 struct device_attribute *attr,
2854 const char *buf, size_t count)
2855{
2856 int ret;
2857 int reg_value;
2858 struct power_supply *psy = dev_get_drvdata(dev);
2859 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2860
2861 reg_value = simple_strtoul(buf, NULL, 10);
2862 if (reg_value > 0x7) {
2863 dev_err(dev, "Incorrect parameter, echo 0 to 7 for debounce setting\n");
2864 goto fail;
2865 }
2866
2867 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
2868 AB8505_RTC_PCUT_DEBOUNCE_REG, (u8)reg_value);
2869
2870 if (ret < 0)
2871 dev_err(dev, "Failed to set AB8505_RTC_PCUT_DEBOUNCE_REG\n");
2872
2873fail:
2874 return count;
2875}
2876
2877static ssize_t ab8505_powercut_enable_status_read(struct device *dev,
2878 struct device_attribute *attr,
2879 char *buf)
2880{
2881 int ret;
2882 u8 reg_value;
2883 struct power_supply *psy = dev_get_drvdata(dev);
2884 struct ab8500_fg *di = power_supply_get_drvdata(psy);
2885
2886 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
2887 AB8505_RTC_PCUT_CTL_STATUS_REG, ®_value);
2888
2889 if (ret < 0) {
2890 dev_err(dev, "Failed to read AB8505_RTC_PCUT_CTL_STATUS_REG\n");
2891 goto fail;
2892 }
2893
2894 return scnprintf(buf, PAGE_SIZE, "%d\n", ((reg_value & 0x20) >> 5));
2895
2896fail:
2897 return ret;
2898}
2899
2900static struct device_attribute ab8505_fg_sysfs_psy_attrs[] = {
2901 __ATTR(powercut_flagtime, (S_IRUGO | S_IWUSR | S_IWGRP),
2902 ab8505_powercut_flagtime_read, ab8505_powercut_flagtime_write),
2903 __ATTR(powercut_maxtime, (S_IRUGO | S_IWUSR | S_IWGRP),
2904 ab8505_powercut_maxtime_read, ab8505_powercut_maxtime_write),
2905 __ATTR(powercut_restart_max, (S_IRUGO | S_IWUSR | S_IWGRP),
2906 ab8505_powercut_restart_read, ab8505_powercut_restart_write),
2907 __ATTR(powercut_timer, S_IRUGO, ab8505_powercut_timer_read, NULL),
2908 __ATTR(powercut_restart_counter, S_IRUGO,
2909 ab8505_powercut_restart_counter_read, NULL),
2910 __ATTR(powercut_enable, (S_IRUGO | S_IWUSR | S_IWGRP),
2911 ab8505_powercut_read, ab8505_powercut_write),
2912 __ATTR(powercut_flag, S_IRUGO, ab8505_powercut_flag_read, NULL),
2913 __ATTR(powercut_debounce_time, (S_IRUGO | S_IWUSR | S_IWGRP),
2914 ab8505_powercut_debounce_read, ab8505_powercut_debounce_write),
2915 __ATTR(powercut_enable_status, S_IRUGO,
2916 ab8505_powercut_enable_status_read, NULL),
2917};
2918
2919static int ab8500_fg_sysfs_psy_create_attrs(struct ab8500_fg *di)
2920{
2921 unsigned int i;
2922
2923 if (((is_ab8505(di->parent) || is_ab9540(di->parent)) &&
2924 abx500_get_chip_id(di->dev) >= AB8500_CUT2P0)
2925 || is_ab8540(di->parent)) {
2926 for (i = 0; i < ARRAY_SIZE(ab8505_fg_sysfs_psy_attrs); i++)
2927 if (device_create_file(&di->fg_psy->dev,
2928 &ab8505_fg_sysfs_psy_attrs[i]))
2929 goto sysfs_psy_create_attrs_failed_ab8505;
2930 }
2931 return 0;
2932sysfs_psy_create_attrs_failed_ab8505:
2933 dev_err(&di->fg_psy->dev, "Failed creating sysfs psy attrs for ab8505.\n");
2934 while (i--)
2935 device_remove_file(&di->fg_psy->dev,
2936 &ab8505_fg_sysfs_psy_attrs[i]);
2937
2938 return -EIO;
2939}
2940
2941static void ab8500_fg_sysfs_psy_remove_attrs(struct ab8500_fg *di)
2942{
2943 unsigned int i;
2944
2945 if (((is_ab8505(di->parent) || is_ab9540(di->parent)) &&
2946 abx500_get_chip_id(di->dev) >= AB8500_CUT2P0)
2947 || is_ab8540(di->parent)) {
2948 for (i = 0; i < ARRAY_SIZE(ab8505_fg_sysfs_psy_attrs); i++)
2949 (void)device_remove_file(&di->fg_psy->dev,
2950 &ab8505_fg_sysfs_psy_attrs[i]);
2951 }
2952}
2953
2954/* Exposure to the sysfs interface <<END>> */
2955
2956#if defined(CONFIG_PM)
2957static int ab8500_fg_resume(struct platform_device *pdev)
2958{
2959 struct ab8500_fg *di = platform_get_drvdata(pdev);
2960
2961 /*
2962 * Change state if we're not charging. If we're charging we will wake
2963 * up on the FG IRQ
2964 */
2965 if (!di->flags.charging) {
2966 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_WAKEUP);
2967 queue_work(di->fg_wq, &di->fg_work);
2968 }
2969
2970 return 0;
2971}
2972
2973static int ab8500_fg_suspend(struct platform_device *pdev,
2974 pm_message_t state)
2975{
2976 struct ab8500_fg *di = platform_get_drvdata(pdev);
2977
2978 flush_delayed_work(&di->fg_periodic_work);
2979 flush_work(&di->fg_work);
2980 flush_work(&di->fg_acc_cur_work);
2981 flush_delayed_work(&di->fg_reinit_work);
2982 flush_delayed_work(&di->fg_low_bat_work);
2983 flush_delayed_work(&di->fg_check_hw_failure_work);
2984
2985 /*
2986 * If the FG is enabled we will disable it before going to suspend
2987 * only if we're not charging
2988 */
2989 if (di->flags.fg_enabled && !di->flags.charging)
2990 ab8500_fg_coulomb_counter(di, false);
2991
2992 return 0;
2993}
2994#else
2995#define ab8500_fg_suspend NULL
2996#define ab8500_fg_resume NULL
2997#endif
2998
2999static int ab8500_fg_remove(struct platform_device *pdev)
3000{
3001 int ret = 0;
3002 struct ab8500_fg *di = platform_get_drvdata(pdev);
3003
3004 list_del(&di->node);
3005
3006 /* Disable coulomb counter */
3007 ret = ab8500_fg_coulomb_counter(di, false);
3008 if (ret)
3009 dev_err(di->dev, "failed to disable coulomb counter\n");
3010
3011 destroy_workqueue(di->fg_wq);
3012 ab8500_fg_sysfs_exit(di);
3013
3014 flush_scheduled_work();
3015 ab8500_fg_sysfs_psy_remove_attrs(di);
3016 power_supply_unregister(di->fg_psy);
3017 return ret;
3018}
3019
3020/* ab8500 fg driver interrupts and their respective isr */
3021static struct ab8500_fg_interrupts ab8500_fg_irq_th[] = {
3022 {"NCONV_ACCU", ab8500_fg_cc_convend_handler},
3023 {"BATT_OVV", ab8500_fg_batt_ovv_handler},
3024 {"LOW_BAT_F", ab8500_fg_lowbatf_handler},
3025 {"CC_INT_CALIB", ab8500_fg_cc_int_calib_handler},
3026};
3027
3028static struct ab8500_fg_interrupts ab8500_fg_irq_bh[] = {
3029 {"CCEOC", ab8500_fg_cc_data_end_handler},
3030};
3031
3032static char *supply_interface[] = {
3033 "ab8500_chargalg",
3034 "ab8500_usb",
3035};
3036
3037static const struct power_supply_desc ab8500_fg_desc = {
3038 .name = "ab8500_fg",
3039 .type = POWER_SUPPLY_TYPE_BATTERY,
3040 .properties = ab8500_fg_props,
3041 .num_properties = ARRAY_SIZE(ab8500_fg_props),
3042 .get_property = ab8500_fg_get_property,
3043 .external_power_changed = ab8500_fg_external_power_changed,
3044};
3045
3046static int ab8500_fg_probe(struct platform_device *pdev)
3047{
3048 struct device_node *np = pdev->dev.of_node;
3049 struct abx500_bm_data *plat = pdev->dev.platform_data;
3050 struct power_supply_config psy_cfg = {};
3051 struct ab8500_fg *di;
3052 int i, irq;
3053 int ret = 0;
3054
3055 di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
3056 if (!di) {
3057 dev_err(&pdev->dev, "%s no mem for ab8500_fg\n", __func__);
3058 return -ENOMEM;
3059 }
3060
3061 if (!plat) {
3062 dev_err(&pdev->dev, "no battery management data supplied\n");
3063 return -EINVAL;
3064 }
3065 di->bm = plat;
3066
3067 if (np) {
3068 ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
3069 if (ret) {
3070 dev_err(&pdev->dev, "failed to get battery information\n");
3071 return ret;
3072 }
3073 }
3074
3075 mutex_init(&di->cc_lock);
3076
3077 /* get parent data */
3078 di->dev = &pdev->dev;
3079 di->parent = dev_get_drvdata(pdev->dev.parent);
3080 di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
3081
3082 psy_cfg.supplied_to = supply_interface;
3083 psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
3084 psy_cfg.drv_data = di;
3085
3086 di->bat_cap.max_mah_design = MILLI_TO_MICRO *
3087 di->bm->bat_type[di->bm->batt_id].charge_full_design;
3088
3089 di->bat_cap.max_mah = di->bat_cap.max_mah_design;
3090
3091 di->vbat_nom = di->bm->bat_type[di->bm->batt_id].nominal_voltage;
3092
3093 di->init_capacity = true;
3094
3095 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
3096 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT);
3097
3098 /* Create a work queue for running the FG algorithm */
3099 di->fg_wq = create_singlethread_workqueue("ab8500_fg_wq");
3100 if (di->fg_wq == NULL) {
3101 dev_err(di->dev, "failed to create work queue\n");
3102 return -ENOMEM;
3103 }
3104
3105 /* Init work for running the fg algorithm instantly */
3106 INIT_WORK(&di->fg_work, ab8500_fg_instant_work);
3107
3108 /* Init work for getting the battery accumulated current */
3109 INIT_WORK(&di->fg_acc_cur_work, ab8500_fg_acc_cur_work);
3110
3111 /* Init work for reinitialising the fg algorithm */
3112 INIT_DEFERRABLE_WORK(&di->fg_reinit_work,
3113 ab8500_fg_reinit_work);
3114
3115 /* Work delayed Queue to run the state machine */
3116 INIT_DEFERRABLE_WORK(&di->fg_periodic_work,
3117 ab8500_fg_periodic_work);
3118
3119 /* Work to check low battery condition */
3120 INIT_DEFERRABLE_WORK(&di->fg_low_bat_work,
3121 ab8500_fg_low_bat_work);
3122
3123 /* Init work for HW failure check */
3124 INIT_DEFERRABLE_WORK(&di->fg_check_hw_failure_work,
3125 ab8500_fg_check_hw_failure_work);
3126
3127 /* Reset battery low voltage flag */
3128 di->flags.low_bat = false;
3129
3130 /* Initialize low battery counter */
3131 di->low_bat_cnt = 10;
3132
3133 /* Initialize OVV, and other registers */
3134 ret = ab8500_fg_init_hw_registers(di);
3135 if (ret) {
3136 dev_err(di->dev, "failed to initialize registers\n");
3137 goto free_inst_curr_wq;
3138 }
3139
3140 /* Consider battery unknown until we're informed otherwise */
3141 di->flags.batt_unknown = true;
3142 di->flags.batt_id_received = false;
3143
3144 /* Register FG power supply class */
3145 di->fg_psy = power_supply_register(di->dev, &ab8500_fg_desc, &psy_cfg);
3146 if (IS_ERR(di->fg_psy)) {
3147 dev_err(di->dev, "failed to register FG psy\n");
3148 ret = PTR_ERR(di->fg_psy);
3149 goto free_inst_curr_wq;
3150 }
3151
3152 di->fg_samples = SEC_TO_SAMPLE(di->bm->fg_params->init_timer);
3153 ab8500_fg_coulomb_counter(di, true);
3154
3155 /*
3156 * Initialize completion used to notify completion and start
3157 * of inst current
3158 */
3159 init_completion(&di->ab8500_fg_started);
3160 init_completion(&di->ab8500_fg_complete);
3161
3162 /* Register primary interrupt handlers */
3163 for (i = 0; i < ARRAY_SIZE(ab8500_fg_irq_th); i++) {
3164 irq = platform_get_irq_byname(pdev, ab8500_fg_irq_th[i].name);
3165 ret = request_irq(irq, ab8500_fg_irq_th[i].isr,
3166 IRQF_SHARED | IRQF_NO_SUSPEND,
3167 ab8500_fg_irq_th[i].name, di);
3168
3169 if (ret != 0) {
3170 dev_err(di->dev, "failed to request %s IRQ %d: %d\n",
3171 ab8500_fg_irq_th[i].name, irq, ret);
3172 goto free_irq;
3173 }
3174 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
3175 ab8500_fg_irq_th[i].name, irq, ret);
3176 }
3177
3178 /* Register threaded interrupt handler */
3179 irq = platform_get_irq_byname(pdev, ab8500_fg_irq_bh[0].name);
3180 ret = request_threaded_irq(irq, NULL, ab8500_fg_irq_bh[0].isr,
3181 IRQF_SHARED | IRQF_NO_SUSPEND | IRQF_ONESHOT,
3182 ab8500_fg_irq_bh[0].name, di);
3183
3184 if (ret != 0) {
3185 dev_err(di->dev, "failed to request %s IRQ %d: %d\n",
3186 ab8500_fg_irq_bh[0].name, irq, ret);
3187 goto free_irq;
3188 }
3189 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
3190 ab8500_fg_irq_bh[0].name, irq, ret);
3191
3192 di->irq = platform_get_irq_byname(pdev, "CCEOC");
3193 disable_irq(di->irq);
3194 di->nbr_cceoc_irq_cnt = 0;
3195
3196 platform_set_drvdata(pdev, di);
3197
3198 ret = ab8500_fg_sysfs_init(di);
3199 if (ret) {
3200 dev_err(di->dev, "failed to create sysfs entry\n");
3201 goto free_irq;
3202 }
3203
3204 ret = ab8500_fg_sysfs_psy_create_attrs(di);
3205 if (ret) {
3206 dev_err(di->dev, "failed to create FG psy\n");
3207 ab8500_fg_sysfs_exit(di);
3208 goto free_irq;
3209 }
3210
3211 /* Calibrate the fg first time */
3212 di->flags.calibrate = true;
3213 di->calib_state = AB8500_FG_CALIB_INIT;
3214
3215 /* Use room temp as default value until we get an update from driver. */
3216 di->bat_temp = 210;
3217
3218 /* Run the FG algorithm */
3219 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
3220
3221 list_add_tail(&di->node, &ab8500_fg_list);
3222
3223 return ret;
3224
3225free_irq:
3226 power_supply_unregister(di->fg_psy);
3227
3228 /* We also have to free all registered irqs */
3229 for (i = 0; i < ARRAY_SIZE(ab8500_fg_irq_th); i++) {
3230 irq = platform_get_irq_byname(pdev, ab8500_fg_irq_th[i].name);
3231 free_irq(irq, di);
3232 }
3233 irq = platform_get_irq_byname(pdev, ab8500_fg_irq_bh[0].name);
3234 free_irq(irq, di);
3235free_inst_curr_wq:
3236 destroy_workqueue(di->fg_wq);
3237 return ret;
3238}
3239
3240static const struct of_device_id ab8500_fg_match[] = {
3241 { .compatible = "stericsson,ab8500-fg", },
3242 { },
3243};
3244
3245static struct platform_driver ab8500_fg_driver = {
3246 .probe = ab8500_fg_probe,
3247 .remove = ab8500_fg_remove,
3248 .suspend = ab8500_fg_suspend,
3249 .resume = ab8500_fg_resume,
3250 .driver = {
3251 .name = "ab8500-fg",
3252 .of_match_table = ab8500_fg_match,
3253 },
3254};
3255
3256static int __init ab8500_fg_init(void)
3257{
3258 return platform_driver_register(&ab8500_fg_driver);
3259}
3260
3261static void __exit ab8500_fg_exit(void)
3262{
3263 platform_driver_unregister(&ab8500_fg_driver);
3264}
3265
3266subsys_initcall_sync(ab8500_fg_init);
3267module_exit(ab8500_fg_exit);
3268
3269MODULE_LICENSE("GPL v2");
3270MODULE_AUTHOR("Johan Palsson, Karl Komierowski");
3271MODULE_ALIAS("platform:ab8500-fg");
3272MODULE_DESCRIPTION("AB8500 Fuel Gauge driver");