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1/*
2 * Copyright 2012 ST Ericsson.
3 *
4 * Power supply driver for ST Ericsson pm2xxx_charger charger
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#include <linux/init.h>
12#include <linux/module.h>
13#include <linux/device.h>
14#include <linux/interrupt.h>
15#include <linux/delay.h>
16#include <linux/slab.h>
17#include <linux/platform_device.h>
18#include <linux/power_supply.h>
19#include <linux/regulator/consumer.h>
20#include <linux/err.h>
21#include <linux/i2c.h>
22#include <linux/workqueue.h>
23#include <linux/mfd/abx500/ab8500.h>
24#include <linux/mfd/abx500/ab8500-bm.h>
25#include <linux/mfd/abx500/ux500_chargalg.h>
26#include <linux/pm2301_charger.h>
27#include <linux/gpio.h>
28#include <linux/pm_runtime.h>
29#include <linux/pm.h>
30
31#include "pm2301_charger.h"
32
33#define to_pm2xxx_charger_ac_device_info(x) container_of((x), \
34 struct pm2xxx_charger, ac_chg)
35#define SLEEP_MIN 50
36#define SLEEP_MAX 100
37#define PM2XXX_AUTOSUSPEND_DELAY 500
38
39static int pm2xxx_interrupt_registers[] = {
40 PM2XXX_REG_INT1,
41 PM2XXX_REG_INT2,
42 PM2XXX_REG_INT3,
43 PM2XXX_REG_INT4,
44 PM2XXX_REG_INT5,
45 PM2XXX_REG_INT6,
46};
47
48static enum power_supply_property pm2xxx_charger_ac_props[] = {
49 POWER_SUPPLY_PROP_HEALTH,
50 POWER_SUPPLY_PROP_PRESENT,
51 POWER_SUPPLY_PROP_ONLINE,
52 POWER_SUPPLY_PROP_VOLTAGE_AVG,
53};
54
55static int pm2xxx_charger_voltage_map[] = {
56 3500,
57 3525,
58 3550,
59 3575,
60 3600,
61 3625,
62 3650,
63 3675,
64 3700,
65 3725,
66 3750,
67 3775,
68 3800,
69 3825,
70 3850,
71 3875,
72 3900,
73 3925,
74 3950,
75 3975,
76 4000,
77 4025,
78 4050,
79 4075,
80 4100,
81 4125,
82 4150,
83 4175,
84 4200,
85 4225,
86 4250,
87 4275,
88 4300,
89};
90
91static int pm2xxx_charger_current_map[] = {
92 200,
93 200,
94 400,
95 600,
96 800,
97 1000,
98 1200,
99 1400,
100 1600,
101 1800,
102 2000,
103 2200,
104 2400,
105 2600,
106 2800,
107 3000,
108};
109
110static const struct i2c_device_id pm2xxx_ident[] = {
111 { "pm2301", 0 },
112 { }
113};
114
115static void set_lpn_pin(struct pm2xxx_charger *pm2)
116{
117 if (!pm2->ac.charger_connected && gpio_is_valid(pm2->lpn_pin)) {
118 gpio_set_value(pm2->lpn_pin, 1);
119 usleep_range(SLEEP_MIN, SLEEP_MAX);
120 }
121}
122
123static void clear_lpn_pin(struct pm2xxx_charger *pm2)
124{
125 if (!pm2->ac.charger_connected && gpio_is_valid(pm2->lpn_pin))
126 gpio_set_value(pm2->lpn_pin, 0);
127}
128
129static int pm2xxx_reg_read(struct pm2xxx_charger *pm2, int reg, u8 *val)
130{
131 int ret;
132
133 /* wake up the device */
134 pm_runtime_get_sync(pm2->dev);
135
136 ret = i2c_smbus_read_i2c_block_data(pm2->config.pm2xxx_i2c, reg,
137 1, val);
138 if (ret < 0)
139 dev_err(pm2->dev, "Error reading register at 0x%x\n", reg);
140 else
141 ret = 0;
142
143 pm_runtime_put_sync(pm2->dev);
144
145 return ret;
146}
147
148static int pm2xxx_reg_write(struct pm2xxx_charger *pm2, int reg, u8 val)
149{
150 int ret;
151
152 /* wake up the device */
153 pm_runtime_get_sync(pm2->dev);
154
155 ret = i2c_smbus_write_i2c_block_data(pm2->config.pm2xxx_i2c, reg,
156 1, &val);
157 if (ret < 0)
158 dev_err(pm2->dev, "Error writing register at 0x%x\n", reg);
159 else
160 ret = 0;
161
162 pm_runtime_put_sync(pm2->dev);
163
164 return ret;
165}
166
167static int pm2xxx_charging_enable_mngt(struct pm2xxx_charger *pm2)
168{
169 int ret;
170
171 /* Enable charging */
172 ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG2,
173 (PM2XXX_CH_AUTO_RESUME_EN | PM2XXX_CHARGER_ENA));
174
175 return ret;
176}
177
178static int pm2xxx_charging_disable_mngt(struct pm2xxx_charger *pm2)
179{
180 int ret;
181
182 /* Disable SW EOC ctrl */
183 ret = pm2xxx_reg_write(pm2, PM2XXX_SW_CTRL_REG, PM2XXX_SWCTRL_HW);
184 if (ret < 0) {
185 dev_err(pm2->dev, "%s pm2xxx write failed\n", __func__);
186 return ret;
187 }
188
189 /* Disable charging */
190 ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG2,
191 (PM2XXX_CH_AUTO_RESUME_DIS | PM2XXX_CHARGER_DIS));
192 if (ret < 0) {
193 dev_err(pm2->dev, "%s pm2xxx write failed\n", __func__);
194 return ret;
195 }
196
197 return 0;
198}
199
200static int pm2xxx_charger_batt_therm_mngt(struct pm2xxx_charger *pm2, int val)
201{
202 queue_work(pm2->charger_wq, &pm2->check_main_thermal_prot_work);
203
204 return 0;
205}
206
207
208static int pm2xxx_charger_die_therm_mngt(struct pm2xxx_charger *pm2, int val)
209{
210 queue_work(pm2->charger_wq, &pm2->check_main_thermal_prot_work);
211
212 return 0;
213}
214
215static int pm2xxx_charger_ovv_mngt(struct pm2xxx_charger *pm2, int val)
216{
217 dev_err(pm2->dev, "Overvoltage detected\n");
218 pm2->flags.ovv = true;
219 power_supply_changed(&pm2->ac_chg.psy);
220
221 /* Schedule a new HW failure check */
222 queue_delayed_work(pm2->charger_wq, &pm2->check_hw_failure_work, 0);
223
224 return 0;
225}
226
227static int pm2xxx_charger_wd_exp_mngt(struct pm2xxx_charger *pm2, int val)
228{
229 dev_dbg(pm2->dev , "20 minutes watchdog expired\n");
230
231 pm2->ac.wd_expired = true;
232 power_supply_changed(&pm2->ac_chg.psy);
233
234 return 0;
235}
236
237static int pm2xxx_charger_vbat_lsig_mngt(struct pm2xxx_charger *pm2, int val)
238{
239 int ret;
240
241 switch (val) {
242 case PM2XXX_INT1_ITVBATLOWR:
243 dev_dbg(pm2->dev, "VBAT grows above VBAT_LOW level\n");
244 /* Enable SW EOC ctrl */
245 ret = pm2xxx_reg_write(pm2, PM2XXX_SW_CTRL_REG,
246 PM2XXX_SWCTRL_SW);
247 if (ret < 0) {
248 dev_err(pm2->dev, "%s pm2xxx write failed\n", __func__);
249 return ret;
250 }
251 break;
252
253 case PM2XXX_INT1_ITVBATLOWF:
254 dev_dbg(pm2->dev, "VBAT drops below VBAT_LOW level\n");
255 /* Disable SW EOC ctrl */
256 ret = pm2xxx_reg_write(pm2, PM2XXX_SW_CTRL_REG,
257 PM2XXX_SWCTRL_HW);
258 if (ret < 0) {
259 dev_err(pm2->dev, "%s pm2xxx write failed\n", __func__);
260 return ret;
261 }
262 break;
263
264 default:
265 dev_err(pm2->dev, "Unknown VBAT level\n");
266 }
267
268 return 0;
269}
270
271static int pm2xxx_charger_bat_disc_mngt(struct pm2xxx_charger *pm2, int val)
272{
273 dev_dbg(pm2->dev, "battery disconnected\n");
274
275 return 0;
276}
277
278static int pm2xxx_charger_detection(struct pm2xxx_charger *pm2, u8 *val)
279{
280 int ret;
281
282 ret = pm2xxx_reg_read(pm2, PM2XXX_SRCE_REG_INT2, val);
283
284 if (ret < 0) {
285 dev_err(pm2->dev, "Charger detection failed\n");
286 goto out;
287 }
288
289 *val &= (PM2XXX_INT2_S_ITVPWR1PLUG | PM2XXX_INT2_S_ITVPWR2PLUG);
290
291out:
292 return ret;
293}
294
295static int pm2xxx_charger_itv_pwr_plug_mngt(struct pm2xxx_charger *pm2, int val)
296{
297
298 int ret;
299 u8 read_val;
300
301 /*
302 * Since we can't be sure that the events are received
303 * synchronously, we have the check if the main charger is
304 * connected by reading the interrupt source register.
305 */
306 ret = pm2xxx_charger_detection(pm2, &read_val);
307
308 if ((ret == 0) && read_val) {
309 pm2->ac.charger_connected = 1;
310 pm2->ac_conn = true;
311 queue_work(pm2->charger_wq, &pm2->ac_work);
312 }
313
314
315 return ret;
316}
317
318static int pm2xxx_charger_itv_pwr_unplug_mngt(struct pm2xxx_charger *pm2,
319 int val)
320{
321 pm2->ac.charger_connected = 0;
322 queue_work(pm2->charger_wq, &pm2->ac_work);
323
324 return 0;
325}
326
327static int pm2_int_reg0(void *pm2_data, int val)
328{
329 struct pm2xxx_charger *pm2 = pm2_data;
330 int ret = 0;
331
332 if (val & PM2XXX_INT1_ITVBATLOWR) {
333 ret = pm2xxx_charger_vbat_lsig_mngt(pm2,
334 PM2XXX_INT1_ITVBATLOWR);
335 if (ret < 0)
336 goto out;
337 }
338
339 if (val & PM2XXX_INT1_ITVBATLOWF) {
340 ret = pm2xxx_charger_vbat_lsig_mngt(pm2,
341 PM2XXX_INT1_ITVBATLOWF);
342 if (ret < 0)
343 goto out;
344 }
345
346 if (val & PM2XXX_INT1_ITVBATDISCONNECT) {
347 ret = pm2xxx_charger_bat_disc_mngt(pm2,
348 PM2XXX_INT1_ITVBATDISCONNECT);
349 if (ret < 0)
350 goto out;
351 }
352out:
353 return ret;
354}
355
356static int pm2_int_reg1(void *pm2_data, int val)
357{
358 struct pm2xxx_charger *pm2 = pm2_data;
359 int ret = 0;
360
361 if (val & (PM2XXX_INT2_ITVPWR1PLUG | PM2XXX_INT2_ITVPWR2PLUG)) {
362 dev_dbg(pm2->dev , "Main charger plugged\n");
363 ret = pm2xxx_charger_itv_pwr_plug_mngt(pm2, val &
364 (PM2XXX_INT2_ITVPWR1PLUG | PM2XXX_INT2_ITVPWR2PLUG));
365 }
366
367 if (val &
368 (PM2XXX_INT2_ITVPWR1UNPLUG | PM2XXX_INT2_ITVPWR2UNPLUG)) {
369 dev_dbg(pm2->dev , "Main charger unplugged\n");
370 ret = pm2xxx_charger_itv_pwr_unplug_mngt(pm2, val &
371 (PM2XXX_INT2_ITVPWR1UNPLUG |
372 PM2XXX_INT2_ITVPWR2UNPLUG));
373 }
374
375 return ret;
376}
377
378static int pm2_int_reg2(void *pm2_data, int val)
379{
380 struct pm2xxx_charger *pm2 = pm2_data;
381 int ret = 0;
382
383 if (val & PM2XXX_INT3_ITAUTOTIMEOUTWD)
384 ret = pm2xxx_charger_wd_exp_mngt(pm2, val);
385
386 if (val & (PM2XXX_INT3_ITCHPRECHARGEWD |
387 PM2XXX_INT3_ITCHCCWD | PM2XXX_INT3_ITCHCVWD)) {
388 dev_dbg(pm2->dev,
389 "Watchdog occurred for precharge, CC and CV charge\n");
390 }
391
392 return ret;
393}
394
395static int pm2_int_reg3(void *pm2_data, int val)
396{
397 struct pm2xxx_charger *pm2 = pm2_data;
398 int ret = 0;
399
400 if (val & (PM2XXX_INT4_ITCHARGINGON)) {
401 dev_dbg(pm2->dev ,
402 "chargind operation has started\n");
403 }
404
405 if (val & (PM2XXX_INT4_ITVRESUME)) {
406 dev_dbg(pm2->dev,
407 "battery discharged down to VResume threshold\n");
408 }
409
410 if (val & (PM2XXX_INT4_ITBATTFULL)) {
411 dev_dbg(pm2->dev , "battery fully detected\n");
412 }
413
414 if (val & (PM2XXX_INT4_ITCVPHASE)) {
415 dev_dbg(pm2->dev, "CV phase enter with 0.5C charging\n");
416 }
417
418 if (val & (PM2XXX_INT4_ITVPWR2OVV | PM2XXX_INT4_ITVPWR1OVV)) {
419 pm2->failure_case = VPWR_OVV;
420 ret = pm2xxx_charger_ovv_mngt(pm2, val &
421 (PM2XXX_INT4_ITVPWR2OVV | PM2XXX_INT4_ITVPWR1OVV));
422 dev_dbg(pm2->dev, "VPWR/VSYSTEM overvoltage detected\n");
423 }
424
425 if (val & (PM2XXX_INT4_S_ITBATTEMPCOLD |
426 PM2XXX_INT4_S_ITBATTEMPHOT)) {
427 ret = pm2xxx_charger_batt_therm_mngt(pm2, val &
428 (PM2XXX_INT4_S_ITBATTEMPCOLD |
429 PM2XXX_INT4_S_ITBATTEMPHOT));
430 dev_dbg(pm2->dev, "BTEMP is too Low/High\n");
431 }
432
433 return ret;
434}
435
436static int pm2_int_reg4(void *pm2_data, int val)
437{
438 struct pm2xxx_charger *pm2 = pm2_data;
439 int ret = 0;
440
441 if (val & PM2XXX_INT5_ITVSYSTEMOVV) {
442 pm2->failure_case = VSYSTEM_OVV;
443 ret = pm2xxx_charger_ovv_mngt(pm2, val &
444 PM2XXX_INT5_ITVSYSTEMOVV);
445 dev_dbg(pm2->dev, "VSYSTEM overvoltage detected\n");
446 }
447
448 if (val & (PM2XXX_INT5_ITTHERMALWARNINGFALL |
449 PM2XXX_INT5_ITTHERMALWARNINGRISE |
450 PM2XXX_INT5_ITTHERMALSHUTDOWNFALL |
451 PM2XXX_INT5_ITTHERMALSHUTDOWNRISE)) {
452 dev_dbg(pm2->dev, "BTEMP die temperature is too Low/High\n");
453 ret = pm2xxx_charger_die_therm_mngt(pm2, val &
454 (PM2XXX_INT5_ITTHERMALWARNINGFALL |
455 PM2XXX_INT5_ITTHERMALWARNINGRISE |
456 PM2XXX_INT5_ITTHERMALSHUTDOWNFALL |
457 PM2XXX_INT5_ITTHERMALSHUTDOWNRISE));
458 }
459
460 return ret;
461}
462
463static int pm2_int_reg5(void *pm2_data, int val)
464{
465 struct pm2xxx_charger *pm2 = pm2_data;
466 int ret = 0;
467
468 if (val & (PM2XXX_INT6_ITVPWR2DROP | PM2XXX_INT6_ITVPWR1DROP)) {
469 dev_dbg(pm2->dev, "VMPWR drop to VBAT level\n");
470 }
471
472 if (val & (PM2XXX_INT6_ITVPWR2VALIDRISE |
473 PM2XXX_INT6_ITVPWR1VALIDRISE |
474 PM2XXX_INT6_ITVPWR2VALIDFALL |
475 PM2XXX_INT6_ITVPWR1VALIDFALL)) {
476 dev_dbg(pm2->dev, "Falling/Rising edge on WPWR1/2\n");
477 }
478
479 return ret;
480}
481
482static irqreturn_t pm2xxx_irq_int(int irq, void *data)
483{
484 struct pm2xxx_charger *pm2 = data;
485 struct pm2xxx_interrupts *interrupt = pm2->pm2_int;
486 int i;
487
488 /* wake up the device */
489 pm_runtime_get_sync(pm2->dev);
490
491 do {
492 for (i = 0; i < PM2XXX_NUM_INT_REG; i++) {
493 pm2xxx_reg_read(pm2,
494 pm2xxx_interrupt_registers[i],
495 &(interrupt->reg[i]));
496
497 if (interrupt->reg[i] > 0)
498 interrupt->handler[i](pm2, interrupt->reg[i]);
499 }
500 } while (gpio_get_value(pm2->pdata->gpio_irq_number) == 0);
501
502 pm_runtime_mark_last_busy(pm2->dev);
503 pm_runtime_put_autosuspend(pm2->dev);
504
505 return IRQ_HANDLED;
506}
507
508static int pm2xxx_charger_get_ac_cv(struct pm2xxx_charger *pm2)
509{
510 int ret = 0;
511 u8 val;
512
513 if (pm2->ac.charger_connected && pm2->ac.charger_online) {
514
515 ret = pm2xxx_reg_read(pm2, PM2XXX_SRCE_REG_INT4, &val);
516 if (ret < 0) {
517 dev_err(pm2->dev, "%s pm2xxx read failed\n", __func__);
518 goto out;
519 }
520
521 if (val & PM2XXX_INT4_S_ITCVPHASE)
522 ret = PM2XXX_CONST_VOLT;
523 else
524 ret = PM2XXX_CONST_CURR;
525 }
526out:
527 return ret;
528}
529
530static int pm2xxx_current_to_regval(int curr)
531{
532 int i;
533
534 if (curr < pm2xxx_charger_current_map[0])
535 return 0;
536
537 for (i = 1; i < ARRAY_SIZE(pm2xxx_charger_current_map); i++) {
538 if (curr < pm2xxx_charger_current_map[i])
539 return (i - 1);
540 }
541
542 i = ARRAY_SIZE(pm2xxx_charger_current_map) - 1;
543 if (curr == pm2xxx_charger_current_map[i])
544 return i;
545 else
546 return -EINVAL;
547}
548
549static int pm2xxx_voltage_to_regval(int curr)
550{
551 int i;
552
553 if (curr < pm2xxx_charger_voltage_map[0])
554 return 0;
555
556 for (i = 1; i < ARRAY_SIZE(pm2xxx_charger_voltage_map); i++) {
557 if (curr < pm2xxx_charger_voltage_map[i])
558 return i - 1;
559 }
560
561 i = ARRAY_SIZE(pm2xxx_charger_voltage_map) - 1;
562 if (curr == pm2xxx_charger_voltage_map[i])
563 return i;
564 else
565 return -EINVAL;
566}
567
568static int pm2xxx_charger_update_charger_current(struct ux500_charger *charger,
569 int ich_out)
570{
571 int ret;
572 int curr_index;
573 struct pm2xxx_charger *pm2;
574 u8 val;
575
576 if (charger->psy.type == POWER_SUPPLY_TYPE_MAINS)
577 pm2 = to_pm2xxx_charger_ac_device_info(charger);
578 else
579 return -ENXIO;
580
581 curr_index = pm2xxx_current_to_regval(ich_out);
582 if (curr_index < 0) {
583 dev_err(pm2->dev,
584 "Charger current too high, charging not started\n");
585 return -ENXIO;
586 }
587
588 ret = pm2xxx_reg_read(pm2, PM2XXX_BATT_CTRL_REG6, &val);
589 if (ret >= 0) {
590 val &= ~PM2XXX_DIR_CH_CC_CURRENT_MASK;
591 val |= curr_index;
592 ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG6, val);
593 if (ret < 0) {
594 dev_err(pm2->dev,
595 "%s write failed\n", __func__);
596 }
597 }
598 else
599 dev_err(pm2->dev, "%s read failed\n", __func__);
600
601 return ret;
602}
603
604static int pm2xxx_charger_ac_get_property(struct power_supply *psy,
605 enum power_supply_property psp,
606 union power_supply_propval *val)
607{
608 struct pm2xxx_charger *pm2;
609
610 pm2 = to_pm2xxx_charger_ac_device_info(psy_to_ux500_charger(psy));
611
612 switch (psp) {
613 case POWER_SUPPLY_PROP_HEALTH:
614 if (pm2->flags.mainextchnotok)
615 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
616 else if (pm2->ac.wd_expired)
617 val->intval = POWER_SUPPLY_HEALTH_DEAD;
618 else if (pm2->flags.main_thermal_prot)
619 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
620 else if (pm2->flags.ovv)
621 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
622 else
623 val->intval = POWER_SUPPLY_HEALTH_GOOD;
624 break;
625 case POWER_SUPPLY_PROP_ONLINE:
626 val->intval = pm2->ac.charger_online;
627 break;
628 case POWER_SUPPLY_PROP_PRESENT:
629 val->intval = pm2->ac.charger_connected;
630 break;
631 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
632 pm2->ac.cv_active = pm2xxx_charger_get_ac_cv(pm2);
633 val->intval = pm2->ac.cv_active;
634 break;
635 default:
636 return -EINVAL;
637 }
638 return 0;
639}
640
641static int pm2xxx_charging_init(struct pm2xxx_charger *pm2)
642{
643 int ret = 0;
644
645 /* enable CC and CV watchdog */
646 ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG3,
647 (PM2XXX_CH_WD_CV_PHASE_60MIN | PM2XXX_CH_WD_CC_PHASE_60MIN));
648 if( ret < 0)
649 return ret;
650
651 /* enable precharge watchdog */
652 ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG4,
653 PM2XXX_CH_WD_PRECH_PHASE_60MIN);
654
655 /* Disable auto timeout */
656 ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG5,
657 PM2XXX_CH_WD_AUTO_TIMEOUT_20MIN);
658
659 /*
660 * EOC current level = 100mA
661 * Precharge current level = 100mA
662 * CC current level = 1000mA
663 */
664 ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG6,
665 (PM2XXX_DIR_CH_CC_CURRENT_1000MA |
666 PM2XXX_CH_PRECH_CURRENT_100MA |
667 PM2XXX_CH_EOC_CURRENT_100MA));
668
669 /*
670 * recharge threshold = 3.8V
671 * Precharge to CC threshold = 2.9V
672 */
673 ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG7,
674 (PM2XXX_CH_PRECH_VOL_2_9 | PM2XXX_CH_VRESUME_VOL_3_8));
675
676 /* float voltage charger level = 4.2V */
677 ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG8,
678 PM2XXX_CH_VOLT_4_2);
679
680 /* Voltage drop between VBAT and VSYS in HW charging = 300mV */
681 ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG9,
682 (PM2XXX_CH_150MV_DROP_300MV | PM2XXX_CHARCHING_INFO_DIS |
683 PM2XXX_CH_CC_REDUCED_CURRENT_IDENT |
684 PM2XXX_CH_CC_MODEDROP_DIS));
685
686 /* Input charger level of over voltage = 10V */
687 ret = pm2xxx_reg_write(pm2, PM2XXX_INP_VOLT_VPWR2,
688 PM2XXX_VPWR2_OVV_10);
689 ret = pm2xxx_reg_write(pm2, PM2XXX_INP_VOLT_VPWR1,
690 PM2XXX_VPWR1_OVV_10);
691
692 /* Input charger drop */
693 ret = pm2xxx_reg_write(pm2, PM2XXX_INP_DROP_VPWR2,
694 (PM2XXX_VPWR2_HW_OPT_DIS | PM2XXX_VPWR2_VALID_DIS |
695 PM2XXX_VPWR2_DROP_DIS));
696 ret = pm2xxx_reg_write(pm2, PM2XXX_INP_DROP_VPWR1,
697 (PM2XXX_VPWR1_HW_OPT_DIS | PM2XXX_VPWR1_VALID_DIS |
698 PM2XXX_VPWR1_DROP_DIS));
699
700 /* Disable battery low monitoring */
701 ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_LOW_LEV_COMP_REG,
702 PM2XXX_VBAT_LOW_MONITORING_ENA);
703
704 return ret;
705}
706
707static int pm2xxx_charger_ac_en(struct ux500_charger *charger,
708 int enable, int vset, int iset)
709{
710 int ret;
711 int volt_index;
712 int curr_index;
713 u8 val;
714
715 struct pm2xxx_charger *pm2 = to_pm2xxx_charger_ac_device_info(charger);
716
717 if (enable) {
718 if (!pm2->ac.charger_connected) {
719 dev_dbg(pm2->dev, "AC charger not connected\n");
720 return -ENXIO;
721 }
722
723 dev_dbg(pm2->dev, "Enable AC: %dmV %dmA\n", vset, iset);
724 if (!pm2->vddadc_en_ac) {
725 ret = regulator_enable(pm2->regu);
726 if (ret)
727 dev_warn(pm2->dev,
728 "Failed to enable vddadc regulator\n");
729 else
730 pm2->vddadc_en_ac = true;
731 }
732
733 ret = pm2xxx_charging_init(pm2);
734 if (ret < 0) {
735 dev_err(pm2->dev, "%s charging init failed\n",
736 __func__);
737 goto error_occured;
738 }
739
740 volt_index = pm2xxx_voltage_to_regval(vset);
741 curr_index = pm2xxx_current_to_regval(iset);
742
743 if (volt_index < 0 || curr_index < 0) {
744 dev_err(pm2->dev,
745 "Charger voltage or current too high, "
746 "charging not started\n");
747 return -ENXIO;
748 }
749
750 ret = pm2xxx_reg_read(pm2, PM2XXX_BATT_CTRL_REG8, &val);
751 if (ret < 0) {
752 dev_err(pm2->dev, "%s pm2xxx read failed\n", __func__);
753 goto error_occured;
754 }
755 val &= ~PM2XXX_CH_VOLT_MASK;
756 val |= volt_index;
757 ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG8, val);
758 if (ret < 0) {
759 dev_err(pm2->dev, "%s pm2xxx write failed\n", __func__);
760 goto error_occured;
761 }
762
763 ret = pm2xxx_reg_read(pm2, PM2XXX_BATT_CTRL_REG6, &val);
764 if (ret < 0) {
765 dev_err(pm2->dev, "%s pm2xxx read failed\n", __func__);
766 goto error_occured;
767 }
768 val &= ~PM2XXX_DIR_CH_CC_CURRENT_MASK;
769 val |= curr_index;
770 ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_CTRL_REG6, val);
771 if (ret < 0) {
772 dev_err(pm2->dev, "%s pm2xxx write failed\n", __func__);
773 goto error_occured;
774 }
775
776 if (!pm2->bat->enable_overshoot) {
777 ret = pm2xxx_reg_read(pm2, PM2XXX_LED_CTRL_REG, &val);
778 if (ret < 0) {
779 dev_err(pm2->dev, "%s pm2xxx read failed\n",
780 __func__);
781 goto error_occured;
782 }
783 val |= PM2XXX_ANTI_OVERSHOOT_EN;
784 ret = pm2xxx_reg_write(pm2, PM2XXX_LED_CTRL_REG, val);
785 if (ret < 0) {
786 dev_err(pm2->dev, "%s pm2xxx write failed\n",
787 __func__);
788 goto error_occured;
789 }
790 }
791
792 ret = pm2xxx_charging_enable_mngt(pm2);
793 if (ret < 0) {
794 dev_err(pm2->dev, "Failed to enable"
795 "pm2xxx ac charger\n");
796 goto error_occured;
797 }
798
799 pm2->ac.charger_online = 1;
800 } else {
801 pm2->ac.charger_online = 0;
802 pm2->ac.wd_expired = false;
803
804 /* Disable regulator if enabled */
805 if (pm2->vddadc_en_ac) {
806 regulator_disable(pm2->regu);
807 pm2->vddadc_en_ac = false;
808 }
809
810 ret = pm2xxx_charging_disable_mngt(pm2);
811 if (ret < 0) {
812 dev_err(pm2->dev, "failed to disable"
813 "pm2xxx ac charger\n");
814 goto error_occured;
815 }
816
817 dev_dbg(pm2->dev, "PM2301: " "Disabled AC charging\n");
818 }
819 power_supply_changed(&pm2->ac_chg.psy);
820
821error_occured:
822 return ret;
823}
824
825static int pm2xxx_charger_watchdog_kick(struct ux500_charger *charger)
826{
827 int ret;
828 struct pm2xxx_charger *pm2;
829
830 if (charger->psy.type == POWER_SUPPLY_TYPE_MAINS)
831 pm2 = to_pm2xxx_charger_ac_device_info(charger);
832 else
833 return -ENXIO;
834
835 ret = pm2xxx_reg_write(pm2, PM2XXX_BATT_WD_KICK, WD_TIMER);
836 if (ret)
837 dev_err(pm2->dev, "Failed to kick WD!\n");
838
839 return ret;
840}
841
842static void pm2xxx_charger_ac_work(struct work_struct *work)
843{
844 struct pm2xxx_charger *pm2 = container_of(work,
845 struct pm2xxx_charger, ac_work);
846
847
848 power_supply_changed(&pm2->ac_chg.psy);
849 sysfs_notify(&pm2->ac_chg.psy.dev->kobj, NULL, "present");
850};
851
852static void pm2xxx_charger_check_hw_failure_work(struct work_struct *work)
853{
854 u8 reg_value;
855
856 struct pm2xxx_charger *pm2 = container_of(work,
857 struct pm2xxx_charger, check_hw_failure_work.work);
858
859 if (pm2->flags.ovv) {
860 pm2xxx_reg_read(pm2, PM2XXX_SRCE_REG_INT4, ®_value);
861
862 if (!(reg_value & (PM2XXX_INT4_S_ITVPWR1OVV |
863 PM2XXX_INT4_S_ITVPWR2OVV))) {
864 pm2->flags.ovv = false;
865 power_supply_changed(&pm2->ac_chg.psy);
866 }
867 }
868
869 /* If we still have a failure, schedule a new check */
870 if (pm2->flags.ovv) {
871 queue_delayed_work(pm2->charger_wq,
872 &pm2->check_hw_failure_work, round_jiffies(HZ));
873 }
874}
875
876static void pm2xxx_charger_check_main_thermal_prot_work(
877 struct work_struct *work)
878{
879 int ret;
880 u8 val;
881
882 struct pm2xxx_charger *pm2 = container_of(work, struct pm2xxx_charger,
883 check_main_thermal_prot_work);
884
885 /* Check if die temp warning is still active */
886 ret = pm2xxx_reg_read(pm2, PM2XXX_SRCE_REG_INT5, &val);
887 if (ret < 0) {
888 dev_err(pm2->dev, "%s pm2xxx read failed\n", __func__);
889 return;
890 }
891 if (val & (PM2XXX_INT5_S_ITTHERMALWARNINGRISE
892 | PM2XXX_INT5_S_ITTHERMALSHUTDOWNRISE))
893 pm2->flags.main_thermal_prot = true;
894 else if (val & (PM2XXX_INT5_S_ITTHERMALWARNINGFALL
895 | PM2XXX_INT5_S_ITTHERMALSHUTDOWNFALL))
896 pm2->flags.main_thermal_prot = false;
897
898 power_supply_changed(&pm2->ac_chg.psy);
899}
900
901static struct pm2xxx_interrupts pm2xxx_int = {
902 .handler[0] = pm2_int_reg0,
903 .handler[1] = pm2_int_reg1,
904 .handler[2] = pm2_int_reg2,
905 .handler[3] = pm2_int_reg3,
906 .handler[4] = pm2_int_reg4,
907 .handler[5] = pm2_int_reg5,
908};
909
910static struct pm2xxx_irq pm2xxx_charger_irq[] = {
911 {"PM2XXX_IRQ_INT", pm2xxx_irq_int},
912};
913
914#ifdef CONFIG_PM
915
916#ifdef CONFIG_PM_SLEEP
917
918static int pm2xxx_wall_charger_resume(struct device *dev)
919{
920 struct i2c_client *i2c_client = to_i2c_client(dev);
921 struct pm2xxx_charger *pm2;
922
923 pm2 = (struct pm2xxx_charger *)i2c_get_clientdata(i2c_client);
924 set_lpn_pin(pm2);
925
926 /* If we still have a HW failure, schedule a new check */
927 if (pm2->flags.ovv)
928 queue_delayed_work(pm2->charger_wq,
929 &pm2->check_hw_failure_work, 0);
930
931 return 0;
932}
933
934static int pm2xxx_wall_charger_suspend(struct device *dev)
935{
936 struct i2c_client *i2c_client = to_i2c_client(dev);
937 struct pm2xxx_charger *pm2;
938
939 pm2 = (struct pm2xxx_charger *)i2c_get_clientdata(i2c_client);
940 clear_lpn_pin(pm2);
941
942 /* Cancel any pending HW failure check */
943 if (delayed_work_pending(&pm2->check_hw_failure_work))
944 cancel_delayed_work(&pm2->check_hw_failure_work);
945
946 flush_work(&pm2->ac_work);
947 flush_work(&pm2->check_main_thermal_prot_work);
948
949 return 0;
950}
951
952#endif
953
954#ifdef CONFIG_PM_RUNTIME
955
956static int pm2xxx_runtime_suspend(struct device *dev)
957{
958 struct i2c_client *pm2xxx_i2c_client = to_i2c_client(dev);
959 struct pm2xxx_charger *pm2;
960
961 pm2 = (struct pm2xxx_charger *)i2c_get_clientdata(pm2xxx_i2c_client);
962 clear_lpn_pin(pm2);
963
964 return 0;
965}
966
967static int pm2xxx_runtime_resume(struct device *dev)
968{
969 struct i2c_client *pm2xxx_i2c_client = to_i2c_client(dev);
970 struct pm2xxx_charger *pm2;
971
972 pm2 = (struct pm2xxx_charger *)i2c_get_clientdata(pm2xxx_i2c_client);
973
974 if (gpio_is_valid(pm2->lpn_pin) && gpio_get_value(pm2->lpn_pin) == 0)
975 set_lpn_pin(pm2);
976
977 return 0;
978}
979
980#endif
981
982static const struct dev_pm_ops pm2xxx_pm_ops = {
983 SET_SYSTEM_SLEEP_PM_OPS(pm2xxx_wall_charger_suspend,
984 pm2xxx_wall_charger_resume)
985 SET_RUNTIME_PM_OPS(pm2xxx_runtime_suspend, pm2xxx_runtime_resume, NULL)
986};
987#define PM2XXX_PM_OPS (&pm2xxx_pm_ops)
988#else
989#define PM2XXX_PM_OPS NULL
990#endif
991
992static int pm2xxx_wall_charger_probe(struct i2c_client *i2c_client,
993 const struct i2c_device_id *id)
994{
995 struct pm2xxx_platform_data *pl_data = i2c_client->dev.platform_data;
996 struct pm2xxx_charger *pm2;
997 int ret = 0;
998 u8 val;
999 int i;
1000
1001 if (!pl_data) {
1002 dev_err(&i2c_client->dev, "No platform data supplied\n");
1003 return -EINVAL;
1004 }
1005
1006 pm2 = kzalloc(sizeof(struct pm2xxx_charger), GFP_KERNEL);
1007 if (!pm2) {
1008 dev_err(&i2c_client->dev, "pm2xxx_charger allocation failed\n");
1009 return -ENOMEM;
1010 }
1011
1012 /* get parent data */
1013 pm2->dev = &i2c_client->dev;
1014
1015 pm2->pm2_int = &pm2xxx_int;
1016
1017 /* get charger spcific platform data */
1018 if (!pl_data->wall_charger) {
1019 dev_err(pm2->dev, "no charger platform data supplied\n");
1020 ret = -EINVAL;
1021 goto free_device_info;
1022 }
1023
1024 pm2->pdata = pl_data->wall_charger;
1025
1026 /* get battery specific platform data */
1027 if (!pl_data->battery) {
1028 dev_err(pm2->dev, "no battery platform data supplied\n");
1029 ret = -EINVAL;
1030 goto free_device_info;
1031 }
1032
1033 pm2->bat = pl_data->battery;
1034
1035 if (!i2c_check_functionality(i2c_client->adapter,
1036 I2C_FUNC_SMBUS_BYTE_DATA |
1037 I2C_FUNC_SMBUS_READ_WORD_DATA)) {
1038 ret = -ENODEV;
1039 dev_info(pm2->dev, "pm2301 i2c_check_functionality failed\n");
1040 goto free_device_info;
1041 }
1042
1043 pm2->config.pm2xxx_i2c = i2c_client;
1044 pm2->config.pm2xxx_id = (struct i2c_device_id *) id;
1045 i2c_set_clientdata(i2c_client, pm2);
1046
1047 /* AC supply */
1048 /* power_supply base class */
1049 pm2->ac_chg.psy.name = pm2->pdata->label;
1050 pm2->ac_chg.psy.type = POWER_SUPPLY_TYPE_MAINS;
1051 pm2->ac_chg.psy.properties = pm2xxx_charger_ac_props;
1052 pm2->ac_chg.psy.num_properties = ARRAY_SIZE(pm2xxx_charger_ac_props);
1053 pm2->ac_chg.psy.get_property = pm2xxx_charger_ac_get_property;
1054 pm2->ac_chg.psy.supplied_to = pm2->pdata->supplied_to;
1055 pm2->ac_chg.psy.num_supplicants = pm2->pdata->num_supplicants;
1056 /* pm2xxx_charger sub-class */
1057 pm2->ac_chg.ops.enable = &pm2xxx_charger_ac_en;
1058 pm2->ac_chg.ops.kick_wd = &pm2xxx_charger_watchdog_kick;
1059 pm2->ac_chg.ops.update_curr = &pm2xxx_charger_update_charger_current;
1060 pm2->ac_chg.max_out_volt = pm2xxx_charger_voltage_map[
1061 ARRAY_SIZE(pm2xxx_charger_voltage_map) - 1];
1062 pm2->ac_chg.max_out_curr = pm2xxx_charger_current_map[
1063 ARRAY_SIZE(pm2xxx_charger_current_map) - 1];
1064 pm2->ac_chg.wdt_refresh = WD_KICK_INTERVAL;
1065 pm2->ac_chg.enabled = true;
1066 pm2->ac_chg.external = true;
1067
1068 /* Create a work queue for the charger */
1069 pm2->charger_wq = create_singlethread_workqueue("pm2xxx_charger_wq");
1070 if (pm2->charger_wq == NULL) {
1071 ret = -ENOMEM;
1072 dev_err(pm2->dev, "failed to create work queue\n");
1073 goto free_device_info;
1074 }
1075
1076 /* Init work for charger detection */
1077 INIT_WORK(&pm2->ac_work, pm2xxx_charger_ac_work);
1078
1079 /* Init work for checking HW status */
1080 INIT_WORK(&pm2->check_main_thermal_prot_work,
1081 pm2xxx_charger_check_main_thermal_prot_work);
1082
1083 /* Init work for HW failure check */
1084 INIT_DEFERRABLE_WORK(&pm2->check_hw_failure_work,
1085 pm2xxx_charger_check_hw_failure_work);
1086
1087 /*
1088 * VDD ADC supply needs to be enabled from this driver when there
1089 * is a charger connected to avoid erroneous BTEMP_HIGH/LOW
1090 * interrupts during charging
1091 */
1092 pm2->regu = regulator_get(pm2->dev, "vddadc");
1093 if (IS_ERR(pm2->regu)) {
1094 ret = PTR_ERR(pm2->regu);
1095 dev_err(pm2->dev, "failed to get vddadc regulator\n");
1096 goto free_charger_wq;
1097 }
1098
1099 /* Register AC charger class */
1100 ret = power_supply_register(pm2->dev, &pm2->ac_chg.psy);
1101 if (ret) {
1102 dev_err(pm2->dev, "failed to register AC charger\n");
1103 goto free_regulator;
1104 }
1105
1106 /* Register interrupts */
1107 ret = request_threaded_irq(gpio_to_irq(pm2->pdata->gpio_irq_number),
1108 NULL,
1109 pm2xxx_charger_irq[0].isr,
1110 pm2->pdata->irq_type,
1111 pm2xxx_charger_irq[0].name, pm2);
1112
1113 if (ret != 0) {
1114 dev_err(pm2->dev, "failed to request %s IRQ %d: %d\n",
1115 pm2xxx_charger_irq[0].name,
1116 gpio_to_irq(pm2->pdata->gpio_irq_number), ret);
1117 goto unregister_pm2xxx_charger;
1118 }
1119
1120 ret = pm_runtime_set_active(pm2->dev);
1121 if (ret)
1122 dev_err(pm2->dev, "set active Error\n");
1123
1124 pm_runtime_enable(pm2->dev);
1125 pm_runtime_set_autosuspend_delay(pm2->dev, PM2XXX_AUTOSUSPEND_DELAY);
1126 pm_runtime_use_autosuspend(pm2->dev);
1127 pm_runtime_resume(pm2->dev);
1128
1129 /* pm interrupt can wake up system */
1130 ret = enable_irq_wake(gpio_to_irq(pm2->pdata->gpio_irq_number));
1131 if (ret) {
1132 dev_err(pm2->dev, "failed to set irq wake\n");
1133 goto unregister_pm2xxx_interrupt;
1134 }
1135
1136 mutex_init(&pm2->lock);
1137
1138 if (gpio_is_valid(pm2->pdata->lpn_gpio)) {
1139 /* get lpn GPIO from platform data */
1140 pm2->lpn_pin = pm2->pdata->lpn_gpio;
1141
1142 /*
1143 * Charger detection mechanism requires pulling up the LPN pin
1144 * while i2c communication if Charger is not connected
1145 * LPN pin of PM2301 is GPIO60 of AB9540
1146 */
1147 ret = gpio_request(pm2->lpn_pin, "pm2301_lpm_gpio");
1148
1149 if (ret < 0) {
1150 dev_err(pm2->dev, "pm2301_lpm_gpio request failed\n");
1151 goto disable_pm2_irq_wake;
1152 }
1153 ret = gpio_direction_output(pm2->lpn_pin, 0);
1154 if (ret < 0) {
1155 dev_err(pm2->dev, "pm2301_lpm_gpio direction failed\n");
1156 goto free_gpio;
1157 }
1158 set_lpn_pin(pm2);
1159 }
1160
1161 /* read interrupt registers */
1162 for (i = 0; i < PM2XXX_NUM_INT_REG; i++)
1163 pm2xxx_reg_read(pm2,
1164 pm2xxx_interrupt_registers[i],
1165 &val);
1166
1167 ret = pm2xxx_charger_detection(pm2, &val);
1168
1169 if ((ret == 0) && val) {
1170 pm2->ac.charger_connected = 1;
1171 ab8500_override_turn_on_stat(~AB8500_POW_KEY_1_ON,
1172 AB8500_MAIN_CH_DET);
1173 pm2->ac_conn = true;
1174 power_supply_changed(&pm2->ac_chg.psy);
1175 sysfs_notify(&pm2->ac_chg.psy.dev->kobj, NULL, "present");
1176 }
1177
1178 return 0;
1179
1180free_gpio:
1181 if (gpio_is_valid(pm2->lpn_pin))
1182 gpio_free(pm2->lpn_pin);
1183disable_pm2_irq_wake:
1184 disable_irq_wake(gpio_to_irq(pm2->pdata->gpio_irq_number));
1185unregister_pm2xxx_interrupt:
1186 /* disable interrupt */
1187 free_irq(gpio_to_irq(pm2->pdata->gpio_irq_number), pm2);
1188unregister_pm2xxx_charger:
1189 /* unregister power supply */
1190 power_supply_unregister(&pm2->ac_chg.psy);
1191free_regulator:
1192 /* disable the regulator */
1193 regulator_put(pm2->regu);
1194free_charger_wq:
1195 destroy_workqueue(pm2->charger_wq);
1196free_device_info:
1197 kfree(pm2);
1198
1199 return ret;
1200}
1201
1202static int pm2xxx_wall_charger_remove(struct i2c_client *i2c_client)
1203{
1204 struct pm2xxx_charger *pm2 = i2c_get_clientdata(i2c_client);
1205
1206 /* Disable pm_runtime */
1207 pm_runtime_disable(pm2->dev);
1208 /* Disable AC charging */
1209 pm2xxx_charger_ac_en(&pm2->ac_chg, false, 0, 0);
1210
1211 /* Disable wake by pm interrupt */
1212 disable_irq_wake(gpio_to_irq(pm2->pdata->gpio_irq_number));
1213
1214 /* Disable interrupts */
1215 free_irq(gpio_to_irq(pm2->pdata->gpio_irq_number), pm2);
1216
1217 /* Delete the work queue */
1218 destroy_workqueue(pm2->charger_wq);
1219
1220 flush_scheduled_work();
1221
1222 /* disable the regulator */
1223 regulator_put(pm2->regu);
1224
1225 power_supply_unregister(&pm2->ac_chg.psy);
1226
1227 if (gpio_is_valid(pm2->lpn_pin))
1228 gpio_free(pm2->lpn_pin);
1229
1230 kfree(pm2);
1231
1232 return 0;
1233}
1234
1235static const struct i2c_device_id pm2xxx_id[] = {
1236 { "pm2301", 0 },
1237 { }
1238};
1239
1240MODULE_DEVICE_TABLE(i2c, pm2xxx_id);
1241
1242static struct i2c_driver pm2xxx_charger_driver = {
1243 .probe = pm2xxx_wall_charger_probe,
1244 .remove = pm2xxx_wall_charger_remove,
1245 .driver = {
1246 .name = "pm2xxx-wall_charger",
1247 .owner = THIS_MODULE,
1248 .pm = PM2XXX_PM_OPS,
1249 },
1250 .id_table = pm2xxx_id,
1251};
1252
1253static int __init pm2xxx_charger_init(void)
1254{
1255 return i2c_add_driver(&pm2xxx_charger_driver);
1256}
1257
1258static void __exit pm2xxx_charger_exit(void)
1259{
1260 i2c_del_driver(&pm2xxx_charger_driver);
1261}
1262
1263device_initcall_sync(pm2xxx_charger_init);
1264module_exit(pm2xxx_charger_exit);
1265
1266MODULE_LICENSE("GPL v2");
1267MODULE_AUTHOR("Rajkumar kasirajan, Olivier Launay");
1268MODULE_ALIAS("i2c:pm2xxx-charger");
1269MODULE_DESCRIPTION("PM2xxx charger management driver");