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1/*
2 * Summit Microelectronics SMB347 Battery Charger Driver
3 *
4 * Copyright (C) 2011, Intel Corporation
5 *
6 * Authors: Bruce E. Robertson <bruce.e.robertson@intel.com>
7 * Mika Westerberg <mika.westerberg@linux.intel.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/err.h>
15#include <linux/gpio.h>
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/init.h>
19#include <linux/interrupt.h>
20#include <linux/i2c.h>
21#include <linux/mutex.h>
22#include <linux/power_supply.h>
23#include <linux/power/smb347-charger.h>
24#include <linux/regmap.h>
25
26/*
27 * Configuration registers. These are mirrored to volatile RAM and can be
28 * written once %CMD_A_ALLOW_WRITE is set in %CMD_A register. They will be
29 * reloaded from non-volatile registers after POR.
30 */
31#define CFG_CHARGE_CURRENT 0x00
32#define CFG_CHARGE_CURRENT_FCC_MASK 0xe0
33#define CFG_CHARGE_CURRENT_FCC_SHIFT 5
34#define CFG_CHARGE_CURRENT_PCC_MASK 0x18
35#define CFG_CHARGE_CURRENT_PCC_SHIFT 3
36#define CFG_CHARGE_CURRENT_TC_MASK 0x07
37#define CFG_CURRENT_LIMIT 0x01
38#define CFG_CURRENT_LIMIT_DC_MASK 0xf0
39#define CFG_CURRENT_LIMIT_DC_SHIFT 4
40#define CFG_CURRENT_LIMIT_USB_MASK 0x0f
41#define CFG_FLOAT_VOLTAGE 0x03
42#define CFG_FLOAT_VOLTAGE_FLOAT_MASK 0x3f
43#define CFG_FLOAT_VOLTAGE_THRESHOLD_MASK 0xc0
44#define CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT 6
45#define CFG_STAT 0x05
46#define CFG_STAT_DISABLED BIT(5)
47#define CFG_STAT_ACTIVE_HIGH BIT(7)
48#define CFG_PIN 0x06
49#define CFG_PIN_EN_CTRL_MASK 0x60
50#define CFG_PIN_EN_CTRL_ACTIVE_HIGH 0x40
51#define CFG_PIN_EN_CTRL_ACTIVE_LOW 0x60
52#define CFG_PIN_EN_APSD_IRQ BIT(1)
53#define CFG_PIN_EN_CHARGER_ERROR BIT(2)
54#define CFG_THERM 0x07
55#define CFG_THERM_SOFT_HOT_COMPENSATION_MASK 0x03
56#define CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT 0
57#define CFG_THERM_SOFT_COLD_COMPENSATION_MASK 0x0c
58#define CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT 2
59#define CFG_THERM_MONITOR_DISABLED BIT(4)
60#define CFG_SYSOK 0x08
61#define CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED BIT(2)
62#define CFG_OTHER 0x09
63#define CFG_OTHER_RID_MASK 0xc0
64#define CFG_OTHER_RID_ENABLED_AUTO_OTG 0xc0
65#define CFG_OTG 0x0a
66#define CFG_OTG_TEMP_THRESHOLD_MASK 0x30
67#define CFG_OTG_TEMP_THRESHOLD_SHIFT 4
68#define CFG_OTG_CC_COMPENSATION_MASK 0xc0
69#define CFG_OTG_CC_COMPENSATION_SHIFT 6
70#define CFG_TEMP_LIMIT 0x0b
71#define CFG_TEMP_LIMIT_SOFT_HOT_MASK 0x03
72#define CFG_TEMP_LIMIT_SOFT_HOT_SHIFT 0
73#define CFG_TEMP_LIMIT_SOFT_COLD_MASK 0x0c
74#define CFG_TEMP_LIMIT_SOFT_COLD_SHIFT 2
75#define CFG_TEMP_LIMIT_HARD_HOT_MASK 0x30
76#define CFG_TEMP_LIMIT_HARD_HOT_SHIFT 4
77#define CFG_TEMP_LIMIT_HARD_COLD_MASK 0xc0
78#define CFG_TEMP_LIMIT_HARD_COLD_SHIFT 6
79#define CFG_FAULT_IRQ 0x0c
80#define CFG_FAULT_IRQ_DCIN_UV BIT(2)
81#define CFG_STATUS_IRQ 0x0d
82#define CFG_STATUS_IRQ_TERMINATION_OR_TAPER BIT(4)
83#define CFG_STATUS_IRQ_CHARGE_TIMEOUT BIT(7)
84#define CFG_ADDRESS 0x0e
85
86/* Command registers */
87#define CMD_A 0x30
88#define CMD_A_CHG_ENABLED BIT(1)
89#define CMD_A_SUSPEND_ENABLED BIT(2)
90#define CMD_A_ALLOW_WRITE BIT(7)
91#define CMD_B 0x31
92#define CMD_C 0x33
93
94/* Interrupt Status registers */
95#define IRQSTAT_A 0x35
96#define IRQSTAT_C 0x37
97#define IRQSTAT_C_TERMINATION_STAT BIT(0)
98#define IRQSTAT_C_TERMINATION_IRQ BIT(1)
99#define IRQSTAT_C_TAPER_IRQ BIT(3)
100#define IRQSTAT_D 0x38
101#define IRQSTAT_D_CHARGE_TIMEOUT_STAT BIT(2)
102#define IRQSTAT_D_CHARGE_TIMEOUT_IRQ BIT(3)
103#define IRQSTAT_E 0x39
104#define IRQSTAT_E_USBIN_UV_STAT BIT(0)
105#define IRQSTAT_E_USBIN_UV_IRQ BIT(1)
106#define IRQSTAT_E_DCIN_UV_STAT BIT(4)
107#define IRQSTAT_E_DCIN_UV_IRQ BIT(5)
108#define IRQSTAT_F 0x3a
109
110/* Status registers */
111#define STAT_A 0x3b
112#define STAT_A_FLOAT_VOLTAGE_MASK 0x3f
113#define STAT_B 0x3c
114#define STAT_C 0x3d
115#define STAT_C_CHG_ENABLED BIT(0)
116#define STAT_C_HOLDOFF_STAT BIT(3)
117#define STAT_C_CHG_MASK 0x06
118#define STAT_C_CHG_SHIFT 1
119#define STAT_C_CHG_TERM BIT(5)
120#define STAT_C_CHARGER_ERROR BIT(6)
121#define STAT_E 0x3f
122
123#define SMB347_MAX_REGISTER 0x3f
124
125/**
126 * struct smb347_charger - smb347 charger instance
127 * @lock: protects concurrent access to online variables
128 * @dev: pointer to device
129 * @regmap: pointer to driver regmap
130 * @mains: power_supply instance for AC/DC power
131 * @usb: power_supply instance for USB power
132 * @battery: power_supply instance for battery
133 * @mains_online: is AC/DC input connected
134 * @usb_online: is USB input connected
135 * @charging_enabled: is charging enabled
136 * @pdata: pointer to platform data
137 */
138struct smb347_charger {
139 struct mutex lock;
140 struct device *dev;
141 struct regmap *regmap;
142 struct power_supply mains;
143 struct power_supply usb;
144 struct power_supply battery;
145 bool mains_online;
146 bool usb_online;
147 bool charging_enabled;
148 const struct smb347_charger_platform_data *pdata;
149};
150
151/* Fast charge current in uA */
152static const unsigned int fcc_tbl[] = {
153 700000,
154 900000,
155 1200000,
156 1500000,
157 1800000,
158 2000000,
159 2200000,
160 2500000,
161};
162
163/* Pre-charge current in uA */
164static const unsigned int pcc_tbl[] = {
165 100000,
166 150000,
167 200000,
168 250000,
169};
170
171/* Termination current in uA */
172static const unsigned int tc_tbl[] = {
173 37500,
174 50000,
175 100000,
176 150000,
177 200000,
178 250000,
179 500000,
180 600000,
181};
182
183/* Input current limit in uA */
184static const unsigned int icl_tbl[] = {
185 300000,
186 500000,
187 700000,
188 900000,
189 1200000,
190 1500000,
191 1800000,
192 2000000,
193 2200000,
194 2500000,
195};
196
197/* Charge current compensation in uA */
198static const unsigned int ccc_tbl[] = {
199 250000,
200 700000,
201 900000,
202 1200000,
203};
204
205/* Convert register value to current using lookup table */
206static int hw_to_current(const unsigned int *tbl, size_t size, unsigned int val)
207{
208 if (val >= size)
209 return -EINVAL;
210 return tbl[val];
211}
212
213/* Convert current to register value using lookup table */
214static int current_to_hw(const unsigned int *tbl, size_t size, unsigned int val)
215{
216 size_t i;
217
218 for (i = 0; i < size; i++)
219 if (val < tbl[i])
220 break;
221 return i > 0 ? i - 1 : -EINVAL;
222}
223
224/**
225 * smb347_update_ps_status - refreshes the power source status
226 * @smb: pointer to smb347 charger instance
227 *
228 * Function checks whether any power source is connected to the charger and
229 * updates internal state accordingly. If there is a change to previous state
230 * function returns %1, otherwise %0 and negative errno in case of errror.
231 */
232static int smb347_update_ps_status(struct smb347_charger *smb)
233{
234 bool usb = false;
235 bool dc = false;
236 unsigned int val;
237 int ret;
238
239 ret = regmap_read(smb->regmap, IRQSTAT_E, &val);
240 if (ret < 0)
241 return ret;
242
243 /*
244 * Dc and usb are set depending on whether they are enabled in
245 * platform data _and_ whether corresponding undervoltage is set.
246 */
247 if (smb->pdata->use_mains)
248 dc = !(val & IRQSTAT_E_DCIN_UV_STAT);
249 if (smb->pdata->use_usb)
250 usb = !(val & IRQSTAT_E_USBIN_UV_STAT);
251
252 mutex_lock(&smb->lock);
253 ret = smb->mains_online != dc || smb->usb_online != usb;
254 smb->mains_online = dc;
255 smb->usb_online = usb;
256 mutex_unlock(&smb->lock);
257
258 return ret;
259}
260
261/*
262 * smb347_is_ps_online - returns whether input power source is connected
263 * @smb: pointer to smb347 charger instance
264 *
265 * Returns %true if input power source is connected. Note that this is
266 * dependent on what platform has configured for usable power sources. For
267 * example if USB is disabled, this will return %false even if the USB cable
268 * is connected.
269 */
270static bool smb347_is_ps_online(struct smb347_charger *smb)
271{
272 bool ret;
273
274 mutex_lock(&smb->lock);
275 ret = smb->usb_online || smb->mains_online;
276 mutex_unlock(&smb->lock);
277
278 return ret;
279}
280
281/**
282 * smb347_charging_status - returns status of charging
283 * @smb: pointer to smb347 charger instance
284 *
285 * Function returns charging status. %0 means no charging is in progress,
286 * %1 means pre-charging, %2 fast-charging and %3 taper-charging.
287 */
288static int smb347_charging_status(struct smb347_charger *smb)
289{
290 unsigned int val;
291 int ret;
292
293 if (!smb347_is_ps_online(smb))
294 return 0;
295
296 ret = regmap_read(smb->regmap, STAT_C, &val);
297 if (ret < 0)
298 return 0;
299
300 return (val & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT;
301}
302
303static int smb347_charging_set(struct smb347_charger *smb, bool enable)
304{
305 int ret = 0;
306
307 if (smb->pdata->enable_control != SMB347_CHG_ENABLE_SW) {
308 dev_dbg(smb->dev, "charging enable/disable in SW disabled\n");
309 return 0;
310 }
311
312 mutex_lock(&smb->lock);
313 if (smb->charging_enabled != enable) {
314 ret = regmap_update_bits(smb->regmap, CMD_A, CMD_A_CHG_ENABLED,
315 enable ? CMD_A_CHG_ENABLED : 0);
316 if (!ret)
317 smb->charging_enabled = enable;
318 }
319 mutex_unlock(&smb->lock);
320 return ret;
321}
322
323static inline int smb347_charging_enable(struct smb347_charger *smb)
324{
325 return smb347_charging_set(smb, true);
326}
327
328static inline int smb347_charging_disable(struct smb347_charger *smb)
329{
330 return smb347_charging_set(smb, false);
331}
332
333static int smb347_start_stop_charging(struct smb347_charger *smb)
334{
335 int ret;
336
337 /*
338 * Depending on whether valid power source is connected or not, we
339 * disable or enable the charging. We do it manually because it
340 * depends on how the platform has configured the valid inputs.
341 */
342 if (smb347_is_ps_online(smb)) {
343 ret = smb347_charging_enable(smb);
344 if (ret < 0)
345 dev_err(smb->dev, "failed to enable charging\n");
346 } else {
347 ret = smb347_charging_disable(smb);
348 if (ret < 0)
349 dev_err(smb->dev, "failed to disable charging\n");
350 }
351
352 return ret;
353}
354
355static int smb347_set_charge_current(struct smb347_charger *smb)
356{
357 int ret;
358
359 if (smb->pdata->max_charge_current) {
360 ret = current_to_hw(fcc_tbl, ARRAY_SIZE(fcc_tbl),
361 smb->pdata->max_charge_current);
362 if (ret < 0)
363 return ret;
364
365 ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
366 CFG_CHARGE_CURRENT_FCC_MASK,
367 ret << CFG_CHARGE_CURRENT_FCC_SHIFT);
368 if (ret < 0)
369 return ret;
370 }
371
372 if (smb->pdata->pre_charge_current) {
373 ret = current_to_hw(pcc_tbl, ARRAY_SIZE(pcc_tbl),
374 smb->pdata->pre_charge_current);
375 if (ret < 0)
376 return ret;
377
378 ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
379 CFG_CHARGE_CURRENT_PCC_MASK,
380 ret << CFG_CHARGE_CURRENT_PCC_SHIFT);
381 if (ret < 0)
382 return ret;
383 }
384
385 if (smb->pdata->termination_current) {
386 ret = current_to_hw(tc_tbl, ARRAY_SIZE(tc_tbl),
387 smb->pdata->termination_current);
388 if (ret < 0)
389 return ret;
390
391 ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
392 CFG_CHARGE_CURRENT_TC_MASK, ret);
393 if (ret < 0)
394 return ret;
395 }
396
397 return 0;
398}
399
400static int smb347_set_current_limits(struct smb347_charger *smb)
401{
402 int ret;
403
404 if (smb->pdata->mains_current_limit) {
405 ret = current_to_hw(icl_tbl, ARRAY_SIZE(icl_tbl),
406 smb->pdata->mains_current_limit);
407 if (ret < 0)
408 return ret;
409
410 ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,
411 CFG_CURRENT_LIMIT_DC_MASK,
412 ret << CFG_CURRENT_LIMIT_DC_SHIFT);
413 if (ret < 0)
414 return ret;
415 }
416
417 if (smb->pdata->usb_hc_current_limit) {
418 ret = current_to_hw(icl_tbl, ARRAY_SIZE(icl_tbl),
419 smb->pdata->usb_hc_current_limit);
420 if (ret < 0)
421 return ret;
422
423 ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,
424 CFG_CURRENT_LIMIT_USB_MASK, ret);
425 if (ret < 0)
426 return ret;
427 }
428
429 return 0;
430}
431
432static int smb347_set_voltage_limits(struct smb347_charger *smb)
433{
434 int ret;
435
436 if (smb->pdata->pre_to_fast_voltage) {
437 ret = smb->pdata->pre_to_fast_voltage;
438
439 /* uV */
440 ret = clamp_val(ret, 2400000, 3000000) - 2400000;
441 ret /= 200000;
442
443 ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,
444 CFG_FLOAT_VOLTAGE_THRESHOLD_MASK,
445 ret << CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT);
446 if (ret < 0)
447 return ret;
448 }
449
450 if (smb->pdata->max_charge_voltage) {
451 ret = smb->pdata->max_charge_voltage;
452
453 /* uV */
454 ret = clamp_val(ret, 3500000, 4500000) - 3500000;
455 ret /= 20000;
456
457 ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,
458 CFG_FLOAT_VOLTAGE_FLOAT_MASK, ret);
459 if (ret < 0)
460 return ret;
461 }
462
463 return 0;
464}
465
466static int smb347_set_temp_limits(struct smb347_charger *smb)
467{
468 bool enable_therm_monitor = false;
469 int ret = 0;
470 int val;
471
472 if (smb->pdata->chip_temp_threshold) {
473 val = smb->pdata->chip_temp_threshold;
474
475 /* degree C */
476 val = clamp_val(val, 100, 130) - 100;
477 val /= 10;
478
479 ret = regmap_update_bits(smb->regmap, CFG_OTG,
480 CFG_OTG_TEMP_THRESHOLD_MASK,
481 val << CFG_OTG_TEMP_THRESHOLD_SHIFT);
482 if (ret < 0)
483 return ret;
484 }
485
486 if (smb->pdata->soft_cold_temp_limit != SMB347_TEMP_USE_DEFAULT) {
487 val = smb->pdata->soft_cold_temp_limit;
488
489 val = clamp_val(val, 0, 15);
490 val /= 5;
491 /* this goes from higher to lower so invert the value */
492 val = ~val & 0x3;
493
494 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
495 CFG_TEMP_LIMIT_SOFT_COLD_MASK,
496 val << CFG_TEMP_LIMIT_SOFT_COLD_SHIFT);
497 if (ret < 0)
498 return ret;
499
500 enable_therm_monitor = true;
501 }
502
503 if (smb->pdata->soft_hot_temp_limit != SMB347_TEMP_USE_DEFAULT) {
504 val = smb->pdata->soft_hot_temp_limit;
505
506 val = clamp_val(val, 40, 55) - 40;
507 val /= 5;
508
509 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
510 CFG_TEMP_LIMIT_SOFT_HOT_MASK,
511 val << CFG_TEMP_LIMIT_SOFT_HOT_SHIFT);
512 if (ret < 0)
513 return ret;
514
515 enable_therm_monitor = true;
516 }
517
518 if (smb->pdata->hard_cold_temp_limit != SMB347_TEMP_USE_DEFAULT) {
519 val = smb->pdata->hard_cold_temp_limit;
520
521 val = clamp_val(val, -5, 10) + 5;
522 val /= 5;
523 /* this goes from higher to lower so invert the value */
524 val = ~val & 0x3;
525
526 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
527 CFG_TEMP_LIMIT_HARD_COLD_MASK,
528 val << CFG_TEMP_LIMIT_HARD_COLD_SHIFT);
529 if (ret < 0)
530 return ret;
531
532 enable_therm_monitor = true;
533 }
534
535 if (smb->pdata->hard_hot_temp_limit != SMB347_TEMP_USE_DEFAULT) {
536 val = smb->pdata->hard_hot_temp_limit;
537
538 val = clamp_val(val, 50, 65) - 50;
539 val /= 5;
540
541 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
542 CFG_TEMP_LIMIT_HARD_HOT_MASK,
543 val << CFG_TEMP_LIMIT_HARD_HOT_SHIFT);
544 if (ret < 0)
545 return ret;
546
547 enable_therm_monitor = true;
548 }
549
550 /*
551 * If any of the temperature limits are set, we also enable the
552 * thermistor monitoring.
553 *
554 * When soft limits are hit, the device will start to compensate
555 * current and/or voltage depending on the configuration.
556 *
557 * When hard limit is hit, the device will suspend charging
558 * depending on the configuration.
559 */
560 if (enable_therm_monitor) {
561 ret = regmap_update_bits(smb->regmap, CFG_THERM,
562 CFG_THERM_MONITOR_DISABLED, 0);
563 if (ret < 0)
564 return ret;
565 }
566
567 if (smb->pdata->suspend_on_hard_temp_limit) {
568 ret = regmap_update_bits(smb->regmap, CFG_SYSOK,
569 CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED, 0);
570 if (ret < 0)
571 return ret;
572 }
573
574 if (smb->pdata->soft_temp_limit_compensation !=
575 SMB347_SOFT_TEMP_COMPENSATE_DEFAULT) {
576 val = smb->pdata->soft_temp_limit_compensation & 0x3;
577
578 ret = regmap_update_bits(smb->regmap, CFG_THERM,
579 CFG_THERM_SOFT_HOT_COMPENSATION_MASK,
580 val << CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT);
581 if (ret < 0)
582 return ret;
583
584 ret = regmap_update_bits(smb->regmap, CFG_THERM,
585 CFG_THERM_SOFT_COLD_COMPENSATION_MASK,
586 val << CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT);
587 if (ret < 0)
588 return ret;
589 }
590
591 if (smb->pdata->charge_current_compensation) {
592 val = current_to_hw(ccc_tbl, ARRAY_SIZE(ccc_tbl),
593 smb->pdata->charge_current_compensation);
594 if (val < 0)
595 return val;
596
597 ret = regmap_update_bits(smb->regmap, CFG_OTG,
598 CFG_OTG_CC_COMPENSATION_MASK,
599 (val & 0x3) << CFG_OTG_CC_COMPENSATION_SHIFT);
600 if (ret < 0)
601 return ret;
602 }
603
604 return ret;
605}
606
607/*
608 * smb347_set_writable - enables/disables writing to non-volatile registers
609 * @smb: pointer to smb347 charger instance
610 *
611 * You can enable/disable writing to the non-volatile configuration
612 * registers by calling this function.
613 *
614 * Returns %0 on success and negative errno in case of failure.
615 */
616static int smb347_set_writable(struct smb347_charger *smb, bool writable)
617{
618 return regmap_update_bits(smb->regmap, CMD_A, CMD_A_ALLOW_WRITE,
619 writable ? CMD_A_ALLOW_WRITE : 0);
620}
621
622static int smb347_hw_init(struct smb347_charger *smb)
623{
624 unsigned int val;
625 int ret;
626
627 ret = smb347_set_writable(smb, true);
628 if (ret < 0)
629 return ret;
630
631 /*
632 * Program the platform specific configuration values to the device
633 * first.
634 */
635 ret = smb347_set_charge_current(smb);
636 if (ret < 0)
637 goto fail;
638
639 ret = smb347_set_current_limits(smb);
640 if (ret < 0)
641 goto fail;
642
643 ret = smb347_set_voltage_limits(smb);
644 if (ret < 0)
645 goto fail;
646
647 ret = smb347_set_temp_limits(smb);
648 if (ret < 0)
649 goto fail;
650
651 /* If USB charging is disabled we put the USB in suspend mode */
652 if (!smb->pdata->use_usb) {
653 ret = regmap_update_bits(smb->regmap, CMD_A,
654 CMD_A_SUSPEND_ENABLED,
655 CMD_A_SUSPEND_ENABLED);
656 if (ret < 0)
657 goto fail;
658 }
659
660 /*
661 * If configured by platform data, we enable hardware Auto-OTG
662 * support for driving VBUS. Otherwise we disable it.
663 */
664 ret = regmap_update_bits(smb->regmap, CFG_OTHER, CFG_OTHER_RID_MASK,
665 smb->pdata->use_usb_otg ? CFG_OTHER_RID_ENABLED_AUTO_OTG : 0);
666 if (ret < 0)
667 goto fail;
668
669 /*
670 * Make the charging functionality controllable by a write to the
671 * command register unless pin control is specified in the platform
672 * data.
673 */
674 switch (smb->pdata->enable_control) {
675 case SMB347_CHG_ENABLE_PIN_ACTIVE_LOW:
676 val = CFG_PIN_EN_CTRL_ACTIVE_LOW;
677 break;
678 case SMB347_CHG_ENABLE_PIN_ACTIVE_HIGH:
679 val = CFG_PIN_EN_CTRL_ACTIVE_HIGH;
680 break;
681 default:
682 val = 0;
683 break;
684 }
685
686 ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CTRL_MASK,
687 val);
688 if (ret < 0)
689 goto fail;
690
691 /* Disable Automatic Power Source Detection (APSD) interrupt. */
692 ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_APSD_IRQ, 0);
693 if (ret < 0)
694 goto fail;
695
696 ret = smb347_update_ps_status(smb);
697 if (ret < 0)
698 goto fail;
699
700 ret = smb347_start_stop_charging(smb);
701
702fail:
703 smb347_set_writable(smb, false);
704 return ret;
705}
706
707static irqreturn_t smb347_interrupt(int irq, void *data)
708{
709 struct smb347_charger *smb = data;
710 unsigned int stat_c, irqstat_c, irqstat_d, irqstat_e;
711 bool handled = false;
712 int ret;
713
714 ret = regmap_read(smb->regmap, STAT_C, &stat_c);
715 if (ret < 0) {
716 dev_warn(smb->dev, "reading STAT_C failed\n");
717 return IRQ_NONE;
718 }
719
720 ret = regmap_read(smb->regmap, IRQSTAT_C, &irqstat_c);
721 if (ret < 0) {
722 dev_warn(smb->dev, "reading IRQSTAT_C failed\n");
723 return IRQ_NONE;
724 }
725
726 ret = regmap_read(smb->regmap, IRQSTAT_D, &irqstat_d);
727 if (ret < 0) {
728 dev_warn(smb->dev, "reading IRQSTAT_D failed\n");
729 return IRQ_NONE;
730 }
731
732 ret = regmap_read(smb->regmap, IRQSTAT_E, &irqstat_e);
733 if (ret < 0) {
734 dev_warn(smb->dev, "reading IRQSTAT_E failed\n");
735 return IRQ_NONE;
736 }
737
738 /*
739 * If we get charger error we report the error back to user.
740 * If the error is recovered charging will resume again.
741 */
742 if (stat_c & STAT_C_CHARGER_ERROR) {
743 dev_err(smb->dev, "charging stopped due to charger error\n");
744 power_supply_changed(&smb->battery);
745 handled = true;
746 }
747
748 /*
749 * If we reached the termination current the battery is charged and
750 * we can update the status now. Charging is automatically
751 * disabled by the hardware.
752 */
753 if (irqstat_c & (IRQSTAT_C_TERMINATION_IRQ | IRQSTAT_C_TAPER_IRQ)) {
754 if (irqstat_c & IRQSTAT_C_TERMINATION_STAT)
755 power_supply_changed(&smb->battery);
756 dev_dbg(smb->dev, "going to HW maintenance mode\n");
757 handled = true;
758 }
759
760 /*
761 * If we got a charger timeout INT that means the charge
762 * full is not detected with in charge timeout value.
763 */
764 if (irqstat_d & IRQSTAT_D_CHARGE_TIMEOUT_IRQ) {
765 dev_dbg(smb->dev, "total Charge Timeout INT received\n");
766
767 if (irqstat_d & IRQSTAT_D_CHARGE_TIMEOUT_STAT)
768 dev_warn(smb->dev, "charging stopped due to timeout\n");
769 power_supply_changed(&smb->battery);
770 handled = true;
771 }
772
773 /*
774 * If we got an under voltage interrupt it means that AC/USB input
775 * was connected or disconnected.
776 */
777 if (irqstat_e & (IRQSTAT_E_USBIN_UV_IRQ | IRQSTAT_E_DCIN_UV_IRQ)) {
778 if (smb347_update_ps_status(smb) > 0) {
779 smb347_start_stop_charging(smb);
780 if (smb->pdata->use_mains)
781 power_supply_changed(&smb->mains);
782 if (smb->pdata->use_usb)
783 power_supply_changed(&smb->usb);
784 }
785 handled = true;
786 }
787
788 return handled ? IRQ_HANDLED : IRQ_NONE;
789}
790
791static int smb347_irq_set(struct smb347_charger *smb, bool enable)
792{
793 int ret;
794
795 ret = smb347_set_writable(smb, true);
796 if (ret < 0)
797 return ret;
798
799 /*
800 * Enable/disable interrupts for:
801 * - under voltage
802 * - termination current reached
803 * - charger timeout
804 * - charger error
805 */
806 ret = regmap_update_bits(smb->regmap, CFG_FAULT_IRQ, 0xff,
807 enable ? CFG_FAULT_IRQ_DCIN_UV : 0);
808 if (ret < 0)
809 goto fail;
810
811 ret = regmap_update_bits(smb->regmap, CFG_STATUS_IRQ, 0xff,
812 enable ? (CFG_STATUS_IRQ_TERMINATION_OR_TAPER |
813 CFG_STATUS_IRQ_CHARGE_TIMEOUT) : 0);
814 if (ret < 0)
815 goto fail;
816
817 ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CHARGER_ERROR,
818 enable ? CFG_PIN_EN_CHARGER_ERROR : 0);
819fail:
820 smb347_set_writable(smb, false);
821 return ret;
822}
823
824static inline int smb347_irq_enable(struct smb347_charger *smb)
825{
826 return smb347_irq_set(smb, true);
827}
828
829static inline int smb347_irq_disable(struct smb347_charger *smb)
830{
831 return smb347_irq_set(smb, false);
832}
833
834static int smb347_irq_init(struct smb347_charger *smb,
835 struct i2c_client *client)
836{
837 const struct smb347_charger_platform_data *pdata = smb->pdata;
838 int ret, irq = gpio_to_irq(pdata->irq_gpio);
839
840 ret = gpio_request_one(pdata->irq_gpio, GPIOF_IN, client->name);
841 if (ret < 0)
842 goto fail;
843
844 ret = request_threaded_irq(irq, NULL, smb347_interrupt,
845 IRQF_TRIGGER_FALLING, client->name, smb);
846 if (ret < 0)
847 goto fail_gpio;
848
849 ret = smb347_set_writable(smb, true);
850 if (ret < 0)
851 goto fail_irq;
852
853 /*
854 * Configure the STAT output to be suitable for interrupts: disable
855 * all other output (except interrupts) and make it active low.
856 */
857 ret = regmap_update_bits(smb->regmap, CFG_STAT,
858 CFG_STAT_ACTIVE_HIGH | CFG_STAT_DISABLED,
859 CFG_STAT_DISABLED);
860 if (ret < 0)
861 goto fail_readonly;
862
863 smb347_set_writable(smb, false);
864 client->irq = irq;
865 return 0;
866
867fail_readonly:
868 smb347_set_writable(smb, false);
869fail_irq:
870 free_irq(irq, smb);
871fail_gpio:
872 gpio_free(pdata->irq_gpio);
873fail:
874 client->irq = 0;
875 return ret;
876}
877
878/*
879 * Returns the constant charge current programmed
880 * into the charger in uA.
881 */
882static int get_const_charge_current(struct smb347_charger *smb)
883{
884 int ret, intval;
885 unsigned int v;
886
887 if (!smb347_is_ps_online(smb))
888 return -ENODATA;
889
890 ret = regmap_read(smb->regmap, STAT_B, &v);
891 if (ret < 0)
892 return ret;
893
894 /*
895 * The current value is composition of FCC and PCC values
896 * and we can detect which table to use from bit 5.
897 */
898 if (v & 0x20) {
899 intval = hw_to_current(fcc_tbl, ARRAY_SIZE(fcc_tbl), v & 7);
900 } else {
901 v >>= 3;
902 intval = hw_to_current(pcc_tbl, ARRAY_SIZE(pcc_tbl), v & 7);
903 }
904
905 return intval;
906}
907
908/*
909 * Returns the constant charge voltage programmed
910 * into the charger in uV.
911 */
912static int get_const_charge_voltage(struct smb347_charger *smb)
913{
914 int ret, intval;
915 unsigned int v;
916
917 if (!smb347_is_ps_online(smb))
918 return -ENODATA;
919
920 ret = regmap_read(smb->regmap, STAT_A, &v);
921 if (ret < 0)
922 return ret;
923
924 v &= STAT_A_FLOAT_VOLTAGE_MASK;
925 if (v > 0x3d)
926 v = 0x3d;
927
928 intval = 3500000 + v * 20000;
929
930 return intval;
931}
932
933static int smb347_mains_get_property(struct power_supply *psy,
934 enum power_supply_property prop,
935 union power_supply_propval *val)
936{
937 struct smb347_charger *smb =
938 container_of(psy, struct smb347_charger, mains);
939 int ret;
940
941 switch (prop) {
942 case POWER_SUPPLY_PROP_ONLINE:
943 val->intval = smb->mains_online;
944 break;
945
946 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
947 ret = get_const_charge_voltage(smb);
948 if (ret < 0)
949 return ret;
950 else
951 val->intval = ret;
952 break;
953
954 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
955 ret = get_const_charge_current(smb);
956 if (ret < 0)
957 return ret;
958 else
959 val->intval = ret;
960 break;
961
962 default:
963 return -EINVAL;
964 }
965
966 return 0;
967}
968
969static enum power_supply_property smb347_mains_properties[] = {
970 POWER_SUPPLY_PROP_ONLINE,
971 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
972 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
973};
974
975static int smb347_usb_get_property(struct power_supply *psy,
976 enum power_supply_property prop,
977 union power_supply_propval *val)
978{
979 struct smb347_charger *smb =
980 container_of(psy, struct smb347_charger, usb);
981 int ret;
982
983 switch (prop) {
984 case POWER_SUPPLY_PROP_ONLINE:
985 val->intval = smb->usb_online;
986 break;
987
988 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
989 ret = get_const_charge_voltage(smb);
990 if (ret < 0)
991 return ret;
992 else
993 val->intval = ret;
994 break;
995
996 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
997 ret = get_const_charge_current(smb);
998 if (ret < 0)
999 return ret;
1000 else
1001 val->intval = ret;
1002 break;
1003
1004 default:
1005 return -EINVAL;
1006 }
1007
1008 return 0;
1009}
1010
1011static enum power_supply_property smb347_usb_properties[] = {
1012 POWER_SUPPLY_PROP_ONLINE,
1013 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
1014 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
1015};
1016
1017static int smb347_get_charging_status(struct smb347_charger *smb)
1018{
1019 int ret, status;
1020 unsigned int val;
1021
1022 if (!smb347_is_ps_online(smb))
1023 return POWER_SUPPLY_STATUS_DISCHARGING;
1024
1025 ret = regmap_read(smb->regmap, STAT_C, &val);
1026 if (ret < 0)
1027 return ret;
1028
1029 if ((val & STAT_C_CHARGER_ERROR) ||
1030 (val & STAT_C_HOLDOFF_STAT)) {
1031 /*
1032 * set to NOT CHARGING upon charger error
1033 * or charging has stopped.
1034 */
1035 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
1036 } else {
1037 if ((val & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT) {
1038 /*
1039 * set to charging if battery is in pre-charge,
1040 * fast charge or taper charging mode.
1041 */
1042 status = POWER_SUPPLY_STATUS_CHARGING;
1043 } else if (val & STAT_C_CHG_TERM) {
1044 /*
1045 * set the status to FULL if battery is not in pre
1046 * charge, fast charge or taper charging mode AND
1047 * charging is terminated at least once.
1048 */
1049 status = POWER_SUPPLY_STATUS_FULL;
1050 } else {
1051 /*
1052 * in this case no charger error or termination
1053 * occured but charging is not in progress!!!
1054 */
1055 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
1056 }
1057 }
1058
1059 return status;
1060}
1061
1062static int smb347_battery_get_property(struct power_supply *psy,
1063 enum power_supply_property prop,
1064 union power_supply_propval *val)
1065{
1066 struct smb347_charger *smb =
1067 container_of(psy, struct smb347_charger, battery);
1068 const struct smb347_charger_platform_data *pdata = smb->pdata;
1069 int ret;
1070
1071 ret = smb347_update_ps_status(smb);
1072 if (ret < 0)
1073 return ret;
1074
1075 switch (prop) {
1076 case POWER_SUPPLY_PROP_STATUS:
1077 ret = smb347_get_charging_status(smb);
1078 if (ret < 0)
1079 return ret;
1080 val->intval = ret;
1081 break;
1082
1083 case POWER_SUPPLY_PROP_CHARGE_TYPE:
1084 if (!smb347_is_ps_online(smb))
1085 return -ENODATA;
1086
1087 /*
1088 * We handle trickle and pre-charging the same, and taper
1089 * and none the same.
1090 */
1091 switch (smb347_charging_status(smb)) {
1092 case 1:
1093 val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
1094 break;
1095 case 2:
1096 val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
1097 break;
1098 default:
1099 val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
1100 break;
1101 }
1102 break;
1103
1104 case POWER_SUPPLY_PROP_TECHNOLOGY:
1105 val->intval = pdata->battery_info.technology;
1106 break;
1107
1108 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
1109 val->intval = pdata->battery_info.voltage_min_design;
1110 break;
1111
1112 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
1113 val->intval = pdata->battery_info.voltage_max_design;
1114 break;
1115
1116 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
1117 val->intval = pdata->battery_info.charge_full_design;
1118 break;
1119
1120 case POWER_SUPPLY_PROP_MODEL_NAME:
1121 val->strval = pdata->battery_info.name;
1122 break;
1123
1124 default:
1125 return -EINVAL;
1126 }
1127
1128 return 0;
1129}
1130
1131static enum power_supply_property smb347_battery_properties[] = {
1132 POWER_SUPPLY_PROP_STATUS,
1133 POWER_SUPPLY_PROP_CHARGE_TYPE,
1134 POWER_SUPPLY_PROP_TECHNOLOGY,
1135 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
1136 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
1137 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
1138 POWER_SUPPLY_PROP_MODEL_NAME,
1139};
1140
1141static bool smb347_volatile_reg(struct device *dev, unsigned int reg)
1142{
1143 switch (reg) {
1144 case IRQSTAT_A:
1145 case IRQSTAT_C:
1146 case IRQSTAT_E:
1147 case IRQSTAT_F:
1148 case STAT_A:
1149 case STAT_B:
1150 case STAT_C:
1151 case STAT_E:
1152 return true;
1153 }
1154
1155 return false;
1156}
1157
1158static bool smb347_readable_reg(struct device *dev, unsigned int reg)
1159{
1160 switch (reg) {
1161 case CFG_CHARGE_CURRENT:
1162 case CFG_CURRENT_LIMIT:
1163 case CFG_FLOAT_VOLTAGE:
1164 case CFG_STAT:
1165 case CFG_PIN:
1166 case CFG_THERM:
1167 case CFG_SYSOK:
1168 case CFG_OTHER:
1169 case CFG_OTG:
1170 case CFG_TEMP_LIMIT:
1171 case CFG_FAULT_IRQ:
1172 case CFG_STATUS_IRQ:
1173 case CFG_ADDRESS:
1174 case CMD_A:
1175 case CMD_B:
1176 case CMD_C:
1177 return true;
1178 }
1179
1180 return smb347_volatile_reg(dev, reg);
1181}
1182
1183static const struct regmap_config smb347_regmap = {
1184 .reg_bits = 8,
1185 .val_bits = 8,
1186 .max_register = SMB347_MAX_REGISTER,
1187 .volatile_reg = smb347_volatile_reg,
1188 .readable_reg = smb347_readable_reg,
1189};
1190
1191static int smb347_probe(struct i2c_client *client,
1192 const struct i2c_device_id *id)
1193{
1194 static char *battery[] = { "smb347-battery" };
1195 const struct smb347_charger_platform_data *pdata;
1196 struct device *dev = &client->dev;
1197 struct smb347_charger *smb;
1198 int ret;
1199
1200 pdata = dev->platform_data;
1201 if (!pdata)
1202 return -EINVAL;
1203
1204 if (!pdata->use_mains && !pdata->use_usb)
1205 return -EINVAL;
1206
1207 smb = devm_kzalloc(dev, sizeof(*smb), GFP_KERNEL);
1208 if (!smb)
1209 return -ENOMEM;
1210
1211 i2c_set_clientdata(client, smb);
1212
1213 mutex_init(&smb->lock);
1214 smb->dev = &client->dev;
1215 smb->pdata = pdata;
1216
1217 smb->regmap = devm_regmap_init_i2c(client, &smb347_regmap);
1218 if (IS_ERR(smb->regmap))
1219 return PTR_ERR(smb->regmap);
1220
1221 ret = smb347_hw_init(smb);
1222 if (ret < 0)
1223 return ret;
1224
1225 if (smb->pdata->use_mains) {
1226 smb->mains.name = "smb347-mains";
1227 smb->mains.type = POWER_SUPPLY_TYPE_MAINS;
1228 smb->mains.get_property = smb347_mains_get_property;
1229 smb->mains.properties = smb347_mains_properties;
1230 smb->mains.num_properties = ARRAY_SIZE(smb347_mains_properties);
1231 smb->mains.supplied_to = battery;
1232 smb->mains.num_supplicants = ARRAY_SIZE(battery);
1233 ret = power_supply_register(dev, &smb->mains);
1234 if (ret < 0)
1235 return ret;
1236 }
1237
1238 if (smb->pdata->use_usb) {
1239 smb->usb.name = "smb347-usb";
1240 smb->usb.type = POWER_SUPPLY_TYPE_USB;
1241 smb->usb.get_property = smb347_usb_get_property;
1242 smb->usb.properties = smb347_usb_properties;
1243 smb->usb.num_properties = ARRAY_SIZE(smb347_usb_properties);
1244 smb->usb.supplied_to = battery;
1245 smb->usb.num_supplicants = ARRAY_SIZE(battery);
1246 ret = power_supply_register(dev, &smb->usb);
1247 if (ret < 0) {
1248 if (smb->pdata->use_mains)
1249 power_supply_unregister(&smb->mains);
1250 return ret;
1251 }
1252 }
1253
1254 smb->battery.name = "smb347-battery";
1255 smb->battery.type = POWER_SUPPLY_TYPE_BATTERY;
1256 smb->battery.get_property = smb347_battery_get_property;
1257 smb->battery.properties = smb347_battery_properties;
1258 smb->battery.num_properties = ARRAY_SIZE(smb347_battery_properties);
1259
1260
1261 ret = power_supply_register(dev, &smb->battery);
1262 if (ret < 0) {
1263 if (smb->pdata->use_usb)
1264 power_supply_unregister(&smb->usb);
1265 if (smb->pdata->use_mains)
1266 power_supply_unregister(&smb->mains);
1267 return ret;
1268 }
1269
1270 /*
1271 * Interrupt pin is optional. If it is connected, we setup the
1272 * interrupt support here.
1273 */
1274 if (pdata->irq_gpio >= 0) {
1275 ret = smb347_irq_init(smb, client);
1276 if (ret < 0) {
1277 dev_warn(dev, "failed to initialize IRQ: %d\n", ret);
1278 dev_warn(dev, "disabling IRQ support\n");
1279 } else {
1280 smb347_irq_enable(smb);
1281 }
1282 }
1283
1284 return 0;
1285}
1286
1287static int smb347_remove(struct i2c_client *client)
1288{
1289 struct smb347_charger *smb = i2c_get_clientdata(client);
1290
1291 if (client->irq) {
1292 smb347_irq_disable(smb);
1293 free_irq(client->irq, smb);
1294 gpio_free(smb->pdata->irq_gpio);
1295 }
1296
1297 power_supply_unregister(&smb->battery);
1298 if (smb->pdata->use_usb)
1299 power_supply_unregister(&smb->usb);
1300 if (smb->pdata->use_mains)
1301 power_supply_unregister(&smb->mains);
1302 return 0;
1303}
1304
1305static const struct i2c_device_id smb347_id[] = {
1306 { "smb347", 0 },
1307 { }
1308};
1309MODULE_DEVICE_TABLE(i2c, smb347_id);
1310
1311static struct i2c_driver smb347_driver = {
1312 .driver = {
1313 .name = "smb347",
1314 },
1315 .probe = smb347_probe,
1316 .remove = smb347_remove,
1317 .id_table = smb347_id,
1318};
1319
1320module_i2c_driver(smb347_driver);
1321
1322MODULE_AUTHOR("Bruce E. Robertson <bruce.e.robertson@intel.com>");
1323MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
1324MODULE_DESCRIPTION("SMB347 battery charger driver");
1325MODULE_LICENSE("GPL");
1326MODULE_ALIAS("i2c:smb347");