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29#include <linux/device.h>
30#include <linux/module.h>
31#include <linux/param.h>
32#include <linux/jiffies.h>
33#include <linux/workqueue.h>
34#include <linux/delay.h>
35#include <linux/platform_device.h>
36#include <linux/power_supply.h>
37#include <linux/idr.h>
38#include <linux/i2c.h>
39#include <linux/slab.h>
40#include <asm/unaligned.h>
41
42#include <linux/power/bq27x00_battery.h>
43
44#define DRIVER_VERSION "1.2.0"
45
46#define BQ27x00_REG_TEMP 0x06
47#define BQ27x00_REG_VOLT 0x08
48#define BQ27x00_REG_AI 0x14
49#define BQ27x00_REG_FLAGS 0x0A
50#define BQ27x00_REG_TTE 0x16
51#define BQ27x00_REG_TTF 0x18
52#define BQ27x00_REG_TTECP 0x26
53#define BQ27x00_REG_NAC 0x0C
54#define BQ27x00_REG_LMD 0x12
55#define BQ27x00_REG_CYCT 0x2A
56#define BQ27x00_REG_AE 0x22
57#define BQ27x00_POWER_AVG 0x24
58
59#define BQ27000_REG_RSOC 0x0B
60#define BQ27000_REG_ILMD 0x76
61#define BQ27000_FLAG_EDVF BIT(0)
62#define BQ27000_FLAG_EDV1 BIT(1)
63#define BQ27000_FLAG_CI BIT(4)
64#define BQ27000_FLAG_FC BIT(5)
65#define BQ27000_FLAG_CHGS BIT(7)
66
67#define BQ27500_REG_SOC 0x2C
68#define BQ27500_REG_DCAP 0x3C
69#define BQ27500_FLAG_DSC BIT(0)
70#define BQ27500_FLAG_SOCF BIT(1)
71#define BQ27500_FLAG_SOC1 BIT(2)
72#define BQ27500_FLAG_FC BIT(9)
73#define BQ27500_FLAG_OTC BIT(15)
74
75#define BQ27742_POWER_AVG 0x76
76
77
78#define BQ27425_REG_OFFSET 0x04
79#define BQ27425_REG_SOC (0x1C + BQ27425_REG_OFFSET)
80#define BQ27425_REG_DCAP (0x3C + BQ27425_REG_OFFSET)
81
82#define BQ27000_RS 20
83#define BQ27x00_POWER_CONSTANT (256 * 29200 / 1000)
84
85struct bq27x00_device_info;
86struct bq27x00_access_methods {
87 int (*read)(struct bq27x00_device_info *di, u8 reg, bool single);
88};
89
90enum bq27x00_chip { BQ27000, BQ27500, BQ27425, BQ27742};
91
92struct bq27x00_reg_cache {
93 int temperature;
94 int time_to_empty;
95 int time_to_empty_avg;
96 int time_to_full;
97 int charge_full;
98 int cycle_count;
99 int capacity;
100 int energy;
101 int flags;
102 int power_avg;
103 int health;
104};
105
106struct bq27x00_device_info {
107 struct device *dev;
108 int id;
109 enum bq27x00_chip chip;
110
111 struct bq27x00_reg_cache cache;
112 int charge_design_full;
113
114 unsigned long last_update;
115 struct delayed_work work;
116
117 struct power_supply bat;
118
119 struct bq27x00_access_methods bus;
120
121 struct mutex lock;
122};
123
124static enum power_supply_property bq27x00_battery_props[] = {
125 POWER_SUPPLY_PROP_STATUS,
126 POWER_SUPPLY_PROP_PRESENT,
127 POWER_SUPPLY_PROP_VOLTAGE_NOW,
128 POWER_SUPPLY_PROP_CURRENT_NOW,
129 POWER_SUPPLY_PROP_CAPACITY,
130 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
131 POWER_SUPPLY_PROP_TEMP,
132 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
133 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
134 POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
135 POWER_SUPPLY_PROP_TECHNOLOGY,
136 POWER_SUPPLY_PROP_CHARGE_FULL,
137 POWER_SUPPLY_PROP_CHARGE_NOW,
138 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
139 POWER_SUPPLY_PROP_CYCLE_COUNT,
140 POWER_SUPPLY_PROP_ENERGY_NOW,
141 POWER_SUPPLY_PROP_POWER_AVG,
142 POWER_SUPPLY_PROP_HEALTH,
143};
144
145static enum power_supply_property bq27425_battery_props[] = {
146 POWER_SUPPLY_PROP_STATUS,
147 POWER_SUPPLY_PROP_PRESENT,
148 POWER_SUPPLY_PROP_VOLTAGE_NOW,
149 POWER_SUPPLY_PROP_CURRENT_NOW,
150 POWER_SUPPLY_PROP_CAPACITY,
151 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
152 POWER_SUPPLY_PROP_TEMP,
153 POWER_SUPPLY_PROP_TECHNOLOGY,
154 POWER_SUPPLY_PROP_CHARGE_FULL,
155 POWER_SUPPLY_PROP_CHARGE_NOW,
156 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
157};
158
159static enum power_supply_property bq27742_battery_props[] = {
160 POWER_SUPPLY_PROP_STATUS,
161 POWER_SUPPLY_PROP_PRESENT,
162 POWER_SUPPLY_PROP_VOLTAGE_NOW,
163 POWER_SUPPLY_PROP_CURRENT_NOW,
164 POWER_SUPPLY_PROP_CAPACITY,
165 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
166 POWER_SUPPLY_PROP_TEMP,
167 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
168 POWER_SUPPLY_PROP_TECHNOLOGY,
169 POWER_SUPPLY_PROP_CHARGE_FULL,
170 POWER_SUPPLY_PROP_CHARGE_NOW,
171 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
172 POWER_SUPPLY_PROP_CYCLE_COUNT,
173 POWER_SUPPLY_PROP_POWER_AVG,
174 POWER_SUPPLY_PROP_HEALTH,
175};
176
177static unsigned int poll_interval = 360;
178module_param(poll_interval, uint, 0644);
179MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \
180 "0 disables polling");
181
182
183
184
185
186static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg,
187 bool single)
188{
189 if (di->chip == BQ27425)
190 return di->bus.read(di, reg - BQ27425_REG_OFFSET, single);
191 return di->bus.read(di, reg, single);
192}
193
194
195
196
197
198
199static bool bq27xxx_is_chip_version_higher(struct bq27x00_device_info *di)
200{
201 if (di->chip == BQ27425 || di->chip == BQ27500 || di->chip == BQ27742)
202 return true;
203 return false;
204}
205
206
207
208
209
210static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di)
211{
212 int rsoc;
213
214 if (di->chip == BQ27500 || di->chip == BQ27742)
215 rsoc = bq27x00_read(di, BQ27500_REG_SOC, false);
216 else if (di->chip == BQ27425)
217 rsoc = bq27x00_read(di, BQ27425_REG_SOC, false);
218 else
219 rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true);
220
221 if (rsoc < 0)
222 dev_dbg(di->dev, "error reading relative State-of-Charge\n");
223
224 return rsoc;
225}
226
227
228
229
230
231static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
232{
233 int charge;
234
235 charge = bq27x00_read(di, reg, false);
236 if (charge < 0) {
237 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
238 reg, charge);
239 return charge;
240 }
241
242 if (bq27xxx_is_chip_version_higher(di))
243 charge *= 1000;
244 else
245 charge = charge * 3570 / BQ27000_RS;
246
247 return charge;
248}
249
250
251
252
253
254static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
255{
256 int flags;
257 bool is_bq27500 = di->chip == BQ27500;
258 bool is_bq27742 = di->chip == BQ27742;
259 bool is_higher = bq27xxx_is_chip_version_higher(di);
260 bool flags_1b = !(is_bq27500 || is_bq27742);
261
262 flags = bq27x00_read(di, BQ27x00_REG_FLAGS, flags_1b);
263 if (flags >= 0 && !is_higher && (flags & BQ27000_FLAG_CI))
264 return -ENODATA;
265
266 return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
267}
268
269
270
271
272
273static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
274{
275 return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD);
276}
277
278
279
280
281
282static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
283{
284 int ilmd;
285
286 if (bq27xxx_is_chip_version_higher(di)) {
287 if (di->chip == BQ27425)
288 ilmd = bq27x00_read(di, BQ27425_REG_DCAP, false);
289 else
290 ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
291 } else
292 ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);
293
294 if (ilmd < 0) {
295 dev_dbg(di->dev, "error reading initial last measured discharge\n");
296 return ilmd;
297 }
298
299 if (bq27xxx_is_chip_version_higher(di))
300 ilmd *= 1000;
301 else
302 ilmd = ilmd * 256 * 3570 / BQ27000_RS;
303
304 return ilmd;
305}
306
307
308
309
310
311static int bq27x00_battery_read_energy(struct bq27x00_device_info *di)
312{
313 int ae;
314
315 ae = bq27x00_read(di, BQ27x00_REG_AE, false);
316 if (ae < 0) {
317 dev_dbg(di->dev, "error reading available energy\n");
318 return ae;
319 }
320
321 if (di->chip == BQ27500)
322 ae *= 1000;
323 else
324 ae = ae * 29200 / BQ27000_RS;
325
326 return ae;
327}
328
329
330
331
332
333static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di)
334{
335 int temp;
336
337 temp = bq27x00_read(di, BQ27x00_REG_TEMP, false);
338 if (temp < 0) {
339 dev_err(di->dev, "error reading temperature\n");
340 return temp;
341 }
342
343 if (!bq27xxx_is_chip_version_higher(di))
344 temp = 5 * temp / 2;
345
346 return temp;
347}
348
349
350
351
352
353static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
354{
355 int cyct;
356
357 cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
358 if (cyct < 0)
359 dev_err(di->dev, "error reading cycle count total\n");
360
361 return cyct;
362}
363
364
365
366
367
368static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
369{
370 int tval;
371
372 tval = bq27x00_read(di, reg, false);
373 if (tval < 0) {
374 dev_dbg(di->dev, "error reading time register %02x: %d\n",
375 reg, tval);
376 return tval;
377 }
378
379 if (tval == 65535)
380 return -ENODATA;
381
382 return tval * 60;
383}
384
385
386
387
388
389static int bq27x00_battery_read_pwr_avg(struct bq27x00_device_info *di, u8 reg)
390{
391 int tval;
392
393 tval = bq27x00_read(di, reg, false);
394 if (tval < 0) {
395 dev_err(di->dev, "error reading power avg rgister %02x: %d\n",
396 reg, tval);
397 return tval;
398 }
399
400 if (di->chip == BQ27500)
401 return tval;
402 else
403 return (tval * BQ27x00_POWER_CONSTANT) / BQ27000_RS;
404}
405
406
407
408
409
410static int bq27x00_battery_read_health(struct bq27x00_device_info *di)
411{
412 int tval;
413
414 tval = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
415 if (tval < 0) {
416 dev_err(di->dev, "error reading flag register:%d\n", tval);
417 return tval;
418 }
419
420 if ((di->chip == BQ27500)) {
421 if (tval & BQ27500_FLAG_SOCF)
422 tval = POWER_SUPPLY_HEALTH_DEAD;
423 else if (tval & BQ27500_FLAG_OTC)
424 tval = POWER_SUPPLY_HEALTH_OVERHEAT;
425 else
426 tval = POWER_SUPPLY_HEALTH_GOOD;
427 return tval;
428 } else {
429 if (tval & BQ27000_FLAG_EDV1)
430 tval = POWER_SUPPLY_HEALTH_DEAD;
431 else
432 tval = POWER_SUPPLY_HEALTH_GOOD;
433 return tval;
434 }
435
436 return -1;
437}
438
439static void bq27x00_update(struct bq27x00_device_info *di)
440{
441 struct bq27x00_reg_cache cache = {0, };
442 bool is_bq27500 = di->chip == BQ27500;
443 bool is_bq27425 = di->chip == BQ27425;
444 bool is_bq27742 = di->chip == BQ27742;
445 bool flags_1b = !(is_bq27500 || is_bq27742);
446
447 cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, flags_1b);
448 if ((cache.flags & 0xff) == 0xff)
449
450 cache.flags = -1;
451 if (cache.flags >= 0) {
452 if (!is_bq27500 && !is_bq27425 && !is_bq27742
453 && (cache.flags & BQ27000_FLAG_CI)) {
454 dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
455 cache.capacity = -ENODATA;
456 cache.energy = -ENODATA;
457 cache.time_to_empty = -ENODATA;
458 cache.time_to_empty_avg = -ENODATA;
459 cache.time_to_full = -ENODATA;
460 cache.charge_full = -ENODATA;
461 cache.health = -ENODATA;
462 } else {
463 cache.capacity = bq27x00_battery_read_rsoc(di);
464 if (is_bq27742)
465 cache.time_to_empty =
466 bq27x00_battery_read_time(di,
467 BQ27x00_REG_TTE);
468 else if (!is_bq27425) {
469 cache.energy = bq27x00_battery_read_energy(di);
470 cache.time_to_empty =
471 bq27x00_battery_read_time(di,
472 BQ27x00_REG_TTE);
473 cache.time_to_empty_avg =
474 bq27x00_battery_read_time(di,
475 BQ27x00_REG_TTECP);
476 cache.time_to_full =
477 bq27x00_battery_read_time(di,
478 BQ27x00_REG_TTF);
479 }
480 cache.charge_full = bq27x00_battery_read_lmd(di);
481 cache.health = bq27x00_battery_read_health(di);
482 }
483 cache.temperature = bq27x00_battery_read_temperature(di);
484 if (!is_bq27425)
485 cache.cycle_count = bq27x00_battery_read_cyct(di);
486 if (is_bq27742)
487 cache.power_avg =
488 bq27x00_battery_read_pwr_avg(di,
489 BQ27742_POWER_AVG);
490 else
491 cache.power_avg =
492 bq27x00_battery_read_pwr_avg(di,
493 BQ27x00_POWER_AVG);
494
495
496 if (di->charge_design_full <= 0)
497 di->charge_design_full = bq27x00_battery_read_ilmd(di);
498 }
499
500 if (di->cache.capacity != cache.capacity)
501 power_supply_changed(&di->bat);
502
503 if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
504 di->cache = cache;
505
506 di->last_update = jiffies;
507}
508
509static void bq27x00_battery_poll(struct work_struct *work)
510{
511 struct bq27x00_device_info *di =
512 container_of(work, struct bq27x00_device_info, work.work);
513
514 bq27x00_update(di);
515
516 if (poll_interval > 0) {
517
518 set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
519 schedule_delayed_work(&di->work, poll_interval * HZ);
520 }
521}
522
523
524
525
526
527
528static int bq27x00_battery_current(struct bq27x00_device_info *di,
529 union power_supply_propval *val)
530{
531 int curr;
532 int flags;
533
534 curr = bq27x00_read(di, BQ27x00_REG_AI, false);
535 if (curr < 0) {
536 dev_err(di->dev, "error reading current\n");
537 return curr;
538 }
539
540 if (bq27xxx_is_chip_version_higher(di)) {
541
542 val->intval = (int)((s16)curr) * 1000;
543 } else {
544 flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
545 if (flags & BQ27000_FLAG_CHGS) {
546 dev_dbg(di->dev, "negative current!\n");
547 curr = -curr;
548 }
549
550 val->intval = curr * 3570 / BQ27000_RS;
551 }
552
553 return 0;
554}
555
556static int bq27x00_battery_status(struct bq27x00_device_info *di,
557 union power_supply_propval *val)
558{
559 int status;
560
561 if (bq27xxx_is_chip_version_higher(di)) {
562 if (di->cache.flags & BQ27500_FLAG_FC)
563 status = POWER_SUPPLY_STATUS_FULL;
564 else if (di->cache.flags & BQ27500_FLAG_DSC)
565 status = POWER_SUPPLY_STATUS_DISCHARGING;
566 else
567 status = POWER_SUPPLY_STATUS_CHARGING;
568 } else {
569 if (di->cache.flags & BQ27000_FLAG_FC)
570 status = POWER_SUPPLY_STATUS_FULL;
571 else if (di->cache.flags & BQ27000_FLAG_CHGS)
572 status = POWER_SUPPLY_STATUS_CHARGING;
573 else if (power_supply_am_i_supplied(&di->bat))
574 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
575 else
576 status = POWER_SUPPLY_STATUS_DISCHARGING;
577 }
578
579 val->intval = status;
580
581 return 0;
582}
583
584static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di,
585 union power_supply_propval *val)
586{
587 int level;
588
589 if (bq27xxx_is_chip_version_higher(di)) {
590 if (di->cache.flags & BQ27500_FLAG_FC)
591 level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
592 else if (di->cache.flags & BQ27500_FLAG_SOC1)
593 level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
594 else if (di->cache.flags & BQ27500_FLAG_SOCF)
595 level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
596 else
597 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
598 } else {
599 if (di->cache.flags & BQ27000_FLAG_FC)
600 level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
601 else if (di->cache.flags & BQ27000_FLAG_EDV1)
602 level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
603 else if (di->cache.flags & BQ27000_FLAG_EDVF)
604 level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
605 else
606 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
607 }
608
609 val->intval = level;
610
611 return 0;
612}
613
614
615
616
617
618static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
619 union power_supply_propval *val)
620{
621 int volt;
622
623 volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
624 if (volt < 0) {
625 dev_err(di->dev, "error reading voltage\n");
626 return volt;
627 }
628
629 val->intval = volt * 1000;
630
631 return 0;
632}
633
634static int bq27x00_simple_value(int value,
635 union power_supply_propval *val)
636{
637 if (value < 0)
638 return value;
639
640 val->intval = value;
641
642 return 0;
643}
644
645#define to_bq27x00_device_info(x) container_of((x), \
646 struct bq27x00_device_info, bat);
647
648static int bq27x00_battery_get_property(struct power_supply *psy,
649 enum power_supply_property psp,
650 union power_supply_propval *val)
651{
652 int ret = 0;
653 struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
654
655 mutex_lock(&di->lock);
656 if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
657 cancel_delayed_work_sync(&di->work);
658 bq27x00_battery_poll(&di->work.work);
659 }
660 mutex_unlock(&di->lock);
661
662 if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
663 return -ENODEV;
664
665 switch (psp) {
666 case POWER_SUPPLY_PROP_STATUS:
667 ret = bq27x00_battery_status(di, val);
668 break;
669 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
670 ret = bq27x00_battery_voltage(di, val);
671 break;
672 case POWER_SUPPLY_PROP_PRESENT:
673 val->intval = di->cache.flags < 0 ? 0 : 1;
674 break;
675 case POWER_SUPPLY_PROP_CURRENT_NOW:
676 ret = bq27x00_battery_current(di, val);
677 break;
678 case POWER_SUPPLY_PROP_CAPACITY:
679 ret = bq27x00_simple_value(di->cache.capacity, val);
680 break;
681 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
682 ret = bq27x00_battery_capacity_level(di, val);
683 break;
684 case POWER_SUPPLY_PROP_TEMP:
685 ret = bq27x00_simple_value(di->cache.temperature, val);
686 if (ret == 0)
687 val->intval -= 2731;
688 break;
689 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
690 ret = bq27x00_simple_value(di->cache.time_to_empty, val);
691 break;
692 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
693 ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val);
694 break;
695 case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
696 ret = bq27x00_simple_value(di->cache.time_to_full, val);
697 break;
698 case POWER_SUPPLY_PROP_TECHNOLOGY:
699 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
700 break;
701 case POWER_SUPPLY_PROP_CHARGE_NOW:
702 ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
703 break;
704 case POWER_SUPPLY_PROP_CHARGE_FULL:
705 ret = bq27x00_simple_value(di->cache.charge_full, val);
706 break;
707 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
708 ret = bq27x00_simple_value(di->charge_design_full, val);
709 break;
710 case POWER_SUPPLY_PROP_CYCLE_COUNT:
711 ret = bq27x00_simple_value(di->cache.cycle_count, val);
712 break;
713 case POWER_SUPPLY_PROP_ENERGY_NOW:
714 ret = bq27x00_simple_value(di->cache.energy, val);
715 break;
716 case POWER_SUPPLY_PROP_POWER_AVG:
717 ret = bq27x00_simple_value(di->cache.power_avg, val);
718 break;
719 case POWER_SUPPLY_PROP_HEALTH:
720 ret = bq27x00_simple_value(di->cache.health, val);
721 break;
722 default:
723 return -EINVAL;
724 }
725
726 return ret;
727}
728
729static void bq27x00_external_power_changed(struct power_supply *psy)
730{
731 struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
732
733 cancel_delayed_work_sync(&di->work);
734 schedule_delayed_work(&di->work, 0);
735}
736
737static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
738{
739 int ret;
740
741 di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
742 if (di->chip == BQ27425) {
743 di->bat.properties = bq27425_battery_props;
744 di->bat.num_properties = ARRAY_SIZE(bq27425_battery_props);
745 } else if (di->chip == BQ27742) {
746 di->bat.properties = bq27742_battery_props;
747 di->bat.num_properties = ARRAY_SIZE(bq27742_battery_props);
748 } else {
749 di->bat.properties = bq27x00_battery_props;
750 di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
751 }
752 di->bat.get_property = bq27x00_battery_get_property;
753 di->bat.external_power_changed = bq27x00_external_power_changed;
754
755 INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
756 mutex_init(&di->lock);
757
758 ret = power_supply_register(di->dev, &di->bat);
759 if (ret) {
760 dev_err(di->dev, "failed to register battery: %d\n", ret);
761 return ret;
762 }
763
764 dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
765
766 bq27x00_update(di);
767
768 return 0;
769}
770
771static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
772{
773
774
775
776
777
778
779 poll_interval = 0;
780
781 cancel_delayed_work_sync(&di->work);
782
783 power_supply_unregister(&di->bat);
784
785 mutex_destroy(&di->lock);
786}
787
788
789
790#ifdef CONFIG_BATTERY_BQ27X00_I2C
791
792
793
794
795static DEFINE_IDR(battery_id);
796static DEFINE_MUTEX(battery_mutex);
797
798static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
799{
800 struct i2c_client *client = to_i2c_client(di->dev);
801 struct i2c_msg msg[2];
802 unsigned char data[2];
803 int ret;
804
805 if (!client->adapter)
806 return -ENODEV;
807
808 msg[0].addr = client->addr;
809 msg[0].flags = 0;
810 msg[0].buf = ®
811 msg[0].len = sizeof(reg);
812 msg[1].addr = client->addr;
813 msg[1].flags = I2C_M_RD;
814 msg[1].buf = data;
815 if (single)
816 msg[1].len = 1;
817 else
818 msg[1].len = 2;
819
820 ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
821 if (ret < 0)
822 return ret;
823
824 if (!single)
825 ret = get_unaligned_le16(data);
826 else
827 ret = data[0];
828
829 return ret;
830}
831
832static int bq27x00_battery_probe(struct i2c_client *client,
833 const struct i2c_device_id *id)
834{
835 char *name;
836 struct bq27x00_device_info *di;
837 int num;
838 int retval = 0;
839
840
841 mutex_lock(&battery_mutex);
842 num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
843 mutex_unlock(&battery_mutex);
844 if (num < 0)
845 return num;
846
847 name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
848 if (!name) {
849 dev_err(&client->dev, "failed to allocate device name\n");
850 retval = -ENOMEM;
851 goto batt_failed_1;
852 }
853
854 di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
855 if (!di) {
856 dev_err(&client->dev, "failed to allocate device info data\n");
857 retval = -ENOMEM;
858 goto batt_failed_2;
859 }
860
861 di->id = num;
862 di->dev = &client->dev;
863 di->chip = id->driver_data;
864 di->bat.name = name;
865 di->bus.read = &bq27x00_read_i2c;
866
867 retval = bq27x00_powersupply_init(di);
868 if (retval)
869 goto batt_failed_2;
870
871 i2c_set_clientdata(client, di);
872
873 return 0;
874
875batt_failed_2:
876 kfree(name);
877batt_failed_1:
878 mutex_lock(&battery_mutex);
879 idr_remove(&battery_id, num);
880 mutex_unlock(&battery_mutex);
881
882 return retval;
883}
884
885static int bq27x00_battery_remove(struct i2c_client *client)
886{
887 struct bq27x00_device_info *di = i2c_get_clientdata(client);
888
889 bq27x00_powersupply_unregister(di);
890
891 kfree(di->bat.name);
892
893 mutex_lock(&battery_mutex);
894 idr_remove(&battery_id, di->id);
895 mutex_unlock(&battery_mutex);
896
897 return 0;
898}
899
900static const struct i2c_device_id bq27x00_id[] = {
901 { "bq27200", BQ27000 },
902 { "bq27500", BQ27500 },
903 { "bq27425", BQ27425 },
904 { "bq27742", BQ27742 },
905 {},
906};
907MODULE_DEVICE_TABLE(i2c, bq27x00_id);
908
909static struct i2c_driver bq27x00_battery_driver = {
910 .driver = {
911 .name = "bq27x00-battery",
912 },
913 .probe = bq27x00_battery_probe,
914 .remove = bq27x00_battery_remove,
915 .id_table = bq27x00_id,
916};
917
918static inline int bq27x00_battery_i2c_init(void)
919{
920 int ret = i2c_add_driver(&bq27x00_battery_driver);
921 if (ret)
922 printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n");
923
924 return ret;
925}
926
927static inline void bq27x00_battery_i2c_exit(void)
928{
929 i2c_del_driver(&bq27x00_battery_driver);
930}
931
932#else
933
934static inline int bq27x00_battery_i2c_init(void) { return 0; }
935static inline void bq27x00_battery_i2c_exit(void) {};
936
937#endif
938
939
940#ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
941
942static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
943 bool single)
944{
945 struct device *dev = di->dev;
946 struct bq27000_platform_data *pdata = dev->platform_data;
947 unsigned int timeout = 3;
948 int upper, lower;
949 int temp;
950
951 if (!single) {
952
953
954 upper = pdata->read(dev, reg + 1);
955 do {
956 temp = upper;
957 if (upper < 0)
958 return upper;
959
960 lower = pdata->read(dev, reg);
961 if (lower < 0)
962 return lower;
963
964 upper = pdata->read(dev, reg + 1);
965 } while (temp != upper && --timeout);
966
967 if (timeout == 0)
968 return -EIO;
969
970 return (upper << 8) | lower;
971 }
972
973 return pdata->read(dev, reg);
974}
975
976static int bq27000_battery_probe(struct platform_device *pdev)
977{
978 struct bq27x00_device_info *di;
979 struct bq27000_platform_data *pdata = pdev->dev.platform_data;
980
981 if (!pdata) {
982 dev_err(&pdev->dev, "no platform_data supplied\n");
983 return -EINVAL;
984 }
985
986 if (!pdata->read) {
987 dev_err(&pdev->dev, "no hdq read callback supplied\n");
988 return -EINVAL;
989 }
990
991 di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
992 if (!di) {
993 dev_err(&pdev->dev, "failed to allocate device info data\n");
994 return -ENOMEM;
995 }
996
997 platform_set_drvdata(pdev, di);
998
999 di->dev = &pdev->dev;
1000 di->chip = BQ27000;
1001
1002 di->bat.name = pdata->name ?: dev_name(&pdev->dev);
1003 di->bus.read = &bq27000_read_platform;
1004
1005 return bq27x00_powersupply_init(di);
1006}
1007
1008static int bq27000_battery_remove(struct platform_device *pdev)
1009{
1010 struct bq27x00_device_info *di = platform_get_drvdata(pdev);
1011
1012 bq27x00_powersupply_unregister(di);
1013
1014 return 0;
1015}
1016
1017static struct platform_driver bq27000_battery_driver = {
1018 .probe = bq27000_battery_probe,
1019 .remove = bq27000_battery_remove,
1020 .driver = {
1021 .name = "bq27000-battery",
1022 },
1023};
1024
1025static inline int bq27x00_battery_platform_init(void)
1026{
1027 int ret = platform_driver_register(&bq27000_battery_driver);
1028 if (ret)
1029 printk(KERN_ERR "Unable to register BQ27000 platform driver\n");
1030
1031 return ret;
1032}
1033
1034static inline void bq27x00_battery_platform_exit(void)
1035{
1036 platform_driver_unregister(&bq27000_battery_driver);
1037}
1038
1039#else
1040
1041static inline int bq27x00_battery_platform_init(void) { return 0; }
1042static inline void bq27x00_battery_platform_exit(void) {};
1043
1044#endif
1045
1046
1047
1048
1049
1050static int __init bq27x00_battery_init(void)
1051{
1052 int ret;
1053
1054 ret = bq27x00_battery_i2c_init();
1055 if (ret)
1056 return ret;
1057
1058 ret = bq27x00_battery_platform_init();
1059 if (ret)
1060 bq27x00_battery_i2c_exit();
1061
1062 return ret;
1063}
1064module_init(bq27x00_battery_init);
1065
1066static void __exit bq27x00_battery_exit(void)
1067{
1068 bq27x00_battery_platform_exit();
1069 bq27x00_battery_i2c_exit();
1070}
1071module_exit(bq27x00_battery_exit);
1072
1073MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1074MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
1075MODULE_LICENSE("GPL");
1076
