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28#include <linux/module.h>
29#include <linux/param.h>
30#include <linux/jiffies.h>
31#include <linux/workqueue.h>
32#include <linux/delay.h>
33#include <linux/platform_device.h>
34#include <linux/power_supply.h>
35#include <linux/idr.h>
36#include <linux/i2c.h>
37#include <linux/slab.h>
38#include <asm/unaligned.h>
39
40#include <linux/power/bq27x00_battery.h>
41
42#define DRIVER_VERSION "1.2.0"
43
44#define BQ27x00_REG_TEMP 0x06
45#define BQ27x00_REG_VOLT 0x08
46#define BQ27x00_REG_AI 0x14
47#define BQ27x00_REG_FLAGS 0x0A
48#define BQ27x00_REG_TTE 0x16
49#define BQ27x00_REG_TTF 0x18
50#define BQ27x00_REG_TTECP 0x26
51#define BQ27x00_REG_NAC 0x0C
52#define BQ27x00_REG_LMD 0x12
53#define BQ27x00_REG_CYCT 0x2A
54#define BQ27x00_REG_AE 0x22
55#define BQ27x00_POWER_AVG 0x24
56
57#define BQ27000_REG_RSOC 0x0B
58#define BQ27000_REG_ILMD 0x76
59#define BQ27000_FLAG_EDVF BIT(0)
60#define BQ27000_FLAG_EDV1 BIT(1)
61#define BQ27000_FLAG_CI BIT(4)
62#define BQ27000_FLAG_FC BIT(5)
63#define BQ27000_FLAG_CHGS BIT(7)
64
65#define BQ27500_REG_SOC 0x2C
66#define BQ27500_REG_DCAP 0x3C
67#define BQ27500_FLAG_DSC BIT(0)
68#define BQ27500_FLAG_SOCF BIT(1)
69#define BQ27500_FLAG_SOC1 BIT(2)
70#define BQ27500_FLAG_FC BIT(9)
71#define BQ27500_FLAG_OTC BIT(15)
72
73
74#define BQ27425_REG_OFFSET 0x04
75#define BQ27425_REG_SOC 0x18
76
77#define BQ27000_RS 20
78#define BQ27x00_POWER_CONSTANT (256 * 29200 / 1000)
79
80struct bq27x00_device_info;
81struct bq27x00_access_methods {
82 int (*read)(struct bq27x00_device_info *di, u8 reg, bool single);
83};
84
85enum bq27x00_chip { BQ27000, BQ27500, BQ27425};
86
87struct bq27x00_reg_cache {
88 int temperature;
89 int time_to_empty;
90 int time_to_empty_avg;
91 int time_to_full;
92 int charge_full;
93 int cycle_count;
94 int capacity;
95 int energy;
96 int flags;
97 int power_avg;
98 int health;
99};
100
101struct bq27x00_device_info {
102 struct device *dev;
103 int id;
104 enum bq27x00_chip chip;
105
106 struct bq27x00_reg_cache cache;
107 int charge_design_full;
108
109 unsigned long last_update;
110 struct delayed_work work;
111
112 struct power_supply bat;
113
114 struct bq27x00_access_methods bus;
115
116 struct mutex lock;
117};
118
119static enum power_supply_property bq27x00_battery_props[] = {
120 POWER_SUPPLY_PROP_STATUS,
121 POWER_SUPPLY_PROP_PRESENT,
122 POWER_SUPPLY_PROP_VOLTAGE_NOW,
123 POWER_SUPPLY_PROP_CURRENT_NOW,
124 POWER_SUPPLY_PROP_CAPACITY,
125 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
126 POWER_SUPPLY_PROP_TEMP,
127 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
128 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
129 POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
130 POWER_SUPPLY_PROP_TECHNOLOGY,
131 POWER_SUPPLY_PROP_CHARGE_FULL,
132 POWER_SUPPLY_PROP_CHARGE_NOW,
133 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
134 POWER_SUPPLY_PROP_CYCLE_COUNT,
135 POWER_SUPPLY_PROP_ENERGY_NOW,
136 POWER_SUPPLY_PROP_POWER_AVG,
137 POWER_SUPPLY_PROP_HEALTH,
138};
139
140static enum power_supply_property bq27425_battery_props[] = {
141 POWER_SUPPLY_PROP_STATUS,
142 POWER_SUPPLY_PROP_PRESENT,
143 POWER_SUPPLY_PROP_VOLTAGE_NOW,
144 POWER_SUPPLY_PROP_CURRENT_NOW,
145 POWER_SUPPLY_PROP_CAPACITY,
146 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
147 POWER_SUPPLY_PROP_TEMP,
148 POWER_SUPPLY_PROP_TECHNOLOGY,
149 POWER_SUPPLY_PROP_CHARGE_FULL,
150 POWER_SUPPLY_PROP_CHARGE_NOW,
151 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
152};
153
154static unsigned int poll_interval = 360;
155module_param(poll_interval, uint, 0644);
156MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \
157 "0 disables polling");
158
159
160
161
162
163static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg,
164 bool single)
165{
166 if (di->chip == BQ27425)
167 return di->bus.read(di, reg - BQ27425_REG_OFFSET, single);
168 return di->bus.read(di, reg, single);
169}
170
171
172
173
174
175
176static bool bq27xxx_is_chip_version_higher(struct bq27x00_device_info *di)
177{
178 if (di->chip == BQ27425 || di->chip == BQ27500)
179 return true;
180 return false;
181}
182
183
184
185
186
187static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di)
188{
189 int rsoc;
190
191 if (di->chip == BQ27500)
192 rsoc = bq27x00_read(di, BQ27500_REG_SOC, false);
193 else if (di->chip == BQ27425)
194 rsoc = bq27x00_read(di, BQ27425_REG_SOC, false);
195 else
196 rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true);
197
198 if (rsoc < 0)
199 dev_dbg(di->dev, "error reading relative State-of-Charge\n");
200
201 return rsoc;
202}
203
204
205
206
207
208static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
209{
210 int charge;
211
212 charge = bq27x00_read(di, reg, false);
213 if (charge < 0) {
214 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
215 reg, charge);
216 return charge;
217 }
218
219 if (bq27xxx_is_chip_version_higher(di))
220 charge *= 1000;
221 else
222 charge = charge * 3570 / BQ27000_RS;
223
224 return charge;
225}
226
227
228
229
230
231static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
232{
233 int flags;
234 bool is_bq27500 = di->chip == BQ27500;
235 bool is_higher = bq27xxx_is_chip_version_higher(di);
236
237 flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500);
238 if (flags >= 0 && !is_higher && (flags & BQ27000_FLAG_CI))
239 return -ENODATA;
240
241 return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
242}
243
244
245
246
247
248static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
249{
250 return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD);
251}
252
253
254
255
256
257static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
258{
259 int ilmd;
260
261 if (bq27xxx_is_chip_version_higher(di))
262 ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
263 else
264 ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);
265
266 if (ilmd < 0) {
267 dev_dbg(di->dev, "error reading initial last measured discharge\n");
268 return ilmd;
269 }
270
271 if (bq27xxx_is_chip_version_higher(di))
272 ilmd *= 1000;
273 else
274 ilmd = ilmd * 256 * 3570 / BQ27000_RS;
275
276 return ilmd;
277}
278
279
280
281
282
283static int bq27x00_battery_read_energy(struct bq27x00_device_info *di)
284{
285 int ae;
286
287 ae = bq27x00_read(di, BQ27x00_REG_AE, false);
288 if (ae < 0) {
289 dev_dbg(di->dev, "error reading available energy\n");
290 return ae;
291 }
292
293 if (di->chip == BQ27500)
294 ae *= 1000;
295 else
296 ae = ae * 29200 / BQ27000_RS;
297
298 return ae;
299}
300
301
302
303
304
305static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di)
306{
307 int temp;
308
309 temp = bq27x00_read(di, BQ27x00_REG_TEMP, false);
310 if (temp < 0) {
311 dev_err(di->dev, "error reading temperature\n");
312 return temp;
313 }
314
315 if (bq27xxx_is_chip_version_higher(di))
316 temp -= 2731;
317 else
318 temp = ((temp * 5) - 5463) / 2;
319
320 return temp;
321}
322
323
324
325
326
327static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
328{
329 int cyct;
330
331 cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
332 if (cyct < 0)
333 dev_err(di->dev, "error reading cycle count total\n");
334
335 return cyct;
336}
337
338
339
340
341
342static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
343{
344 int tval;
345
346 tval = bq27x00_read(di, reg, false);
347 if (tval < 0) {
348 dev_dbg(di->dev, "error reading time register %02x: %d\n",
349 reg, tval);
350 return tval;
351 }
352
353 if (tval == 65535)
354 return -ENODATA;
355
356 return tval * 60;
357}
358
359
360
361
362
363static int bq27x00_battery_read_pwr_avg(struct bq27x00_device_info *di, u8 reg)
364{
365 int tval;
366
367 tval = bq27x00_read(di, reg, false);
368 if (tval < 0) {
369 dev_err(di->dev, "error reading power avg rgister %02x: %d\n",
370 reg, tval);
371 return tval;
372 }
373
374 if (di->chip == BQ27500)
375 return tval;
376 else
377 return (tval * BQ27x00_POWER_CONSTANT) / BQ27000_RS;
378}
379
380
381
382
383
384static int bq27x00_battery_read_health(struct bq27x00_device_info *di)
385{
386 int tval;
387
388 tval = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
389 if (tval < 0) {
390 dev_err(di->dev, "error reading flag register:%d\n", tval);
391 return tval;
392 }
393
394 if ((di->chip == BQ27500)) {
395 if (tval & BQ27500_FLAG_SOCF)
396 tval = POWER_SUPPLY_HEALTH_DEAD;
397 else if (tval & BQ27500_FLAG_OTC)
398 tval = POWER_SUPPLY_HEALTH_OVERHEAT;
399 else
400 tval = POWER_SUPPLY_HEALTH_GOOD;
401 return tval;
402 } else {
403 if (tval & BQ27000_FLAG_EDV1)
404 tval = POWER_SUPPLY_HEALTH_DEAD;
405 else
406 tval = POWER_SUPPLY_HEALTH_GOOD;
407 return tval;
408 }
409
410 return -1;
411}
412
413static void bq27x00_update(struct bq27x00_device_info *di)
414{
415 struct bq27x00_reg_cache cache = {0, };
416 bool is_bq27500 = di->chip == BQ27500;
417 bool is_bq27425 = di->chip == BQ27425;
418
419 cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500);
420 if (cache.flags >= 0) {
421 if (!is_bq27500 && !is_bq27425
422 && (cache.flags & BQ27000_FLAG_CI)) {
423 dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
424 cache.capacity = -ENODATA;
425 cache.energy = -ENODATA;
426 cache.time_to_empty = -ENODATA;
427 cache.time_to_empty_avg = -ENODATA;
428 cache.time_to_full = -ENODATA;
429 cache.charge_full = -ENODATA;
430 cache.health = -ENODATA;
431 } else {
432 cache.capacity = bq27x00_battery_read_rsoc(di);
433 if (!is_bq27425) {
434 cache.energy = bq27x00_battery_read_energy(di);
435 cache.time_to_empty =
436 bq27x00_battery_read_time(di,
437 BQ27x00_REG_TTE);
438 cache.time_to_empty_avg =
439 bq27x00_battery_read_time(di,
440 BQ27x00_REG_TTECP);
441 cache.time_to_full =
442 bq27x00_battery_read_time(di,
443 BQ27x00_REG_TTF);
444 }
445 cache.charge_full = bq27x00_battery_read_lmd(di);
446 cache.health = bq27x00_battery_read_health(di);
447 }
448 cache.temperature = bq27x00_battery_read_temperature(di);
449 if (!is_bq27425)
450 cache.cycle_count = bq27x00_battery_read_cyct(di);
451 cache.cycle_count = bq27x00_battery_read_cyct(di);
452 cache.power_avg =
453 bq27x00_battery_read_pwr_avg(di, BQ27x00_POWER_AVG);
454
455
456 if (di->charge_design_full <= 0)
457 di->charge_design_full = bq27x00_battery_read_ilmd(di);
458 }
459
460 if (memcmp(&di->cache, &cache, sizeof(cache)) != 0) {
461 di->cache = cache;
462 power_supply_changed(&di->bat);
463 }
464
465 di->last_update = jiffies;
466}
467
468static void bq27x00_battery_poll(struct work_struct *work)
469{
470 struct bq27x00_device_info *di =
471 container_of(work, struct bq27x00_device_info, work.work);
472
473 bq27x00_update(di);
474
475 if (poll_interval > 0) {
476
477 set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
478 schedule_delayed_work(&di->work, poll_interval * HZ);
479 }
480}
481
482
483
484
485
486
487static int bq27x00_battery_current(struct bq27x00_device_info *di,
488 union power_supply_propval *val)
489{
490 int curr;
491 int flags;
492
493 curr = bq27x00_read(di, BQ27x00_REG_AI, false);
494 if (curr < 0) {
495 dev_err(di->dev, "error reading current\n");
496 return curr;
497 }
498
499 if (bq27xxx_is_chip_version_higher(di)) {
500
501 val->intval = (int)((s16)curr) * 1000;
502 } else {
503 flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
504 if (flags & BQ27000_FLAG_CHGS) {
505 dev_dbg(di->dev, "negative current!\n");
506 curr = -curr;
507 }
508
509 val->intval = curr * 3570 / BQ27000_RS;
510 }
511
512 return 0;
513}
514
515static int bq27x00_battery_status(struct bq27x00_device_info *di,
516 union power_supply_propval *val)
517{
518 int status;
519
520 if (bq27xxx_is_chip_version_higher(di)) {
521 if (di->cache.flags & BQ27500_FLAG_FC)
522 status = POWER_SUPPLY_STATUS_FULL;
523 else if (di->cache.flags & BQ27500_FLAG_DSC)
524 status = POWER_SUPPLY_STATUS_DISCHARGING;
525 else
526 status = POWER_SUPPLY_STATUS_CHARGING;
527 } else {
528 if (di->cache.flags & BQ27000_FLAG_FC)
529 status = POWER_SUPPLY_STATUS_FULL;
530 else if (di->cache.flags & BQ27000_FLAG_CHGS)
531 status = POWER_SUPPLY_STATUS_CHARGING;
532 else if (power_supply_am_i_supplied(&di->bat))
533 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
534 else
535 status = POWER_SUPPLY_STATUS_DISCHARGING;
536 }
537
538 val->intval = status;
539
540 return 0;
541}
542
543static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di,
544 union power_supply_propval *val)
545{
546 int level;
547
548 if (bq27xxx_is_chip_version_higher(di)) {
549 if (di->cache.flags & BQ27500_FLAG_FC)
550 level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
551 else if (di->cache.flags & BQ27500_FLAG_SOC1)
552 level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
553 else if (di->cache.flags & BQ27500_FLAG_SOCF)
554 level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
555 else
556 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
557 } else {
558 if (di->cache.flags & BQ27000_FLAG_FC)
559 level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
560 else if (di->cache.flags & BQ27000_FLAG_EDV1)
561 level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
562 else if (di->cache.flags & BQ27000_FLAG_EDVF)
563 level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
564 else
565 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
566 }
567
568 val->intval = level;
569
570 return 0;
571}
572
573
574
575
576
577static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
578 union power_supply_propval *val)
579{
580 int volt;
581
582 volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
583 if (volt < 0) {
584 dev_err(di->dev, "error reading voltage\n");
585 return volt;
586 }
587
588 val->intval = volt * 1000;
589
590 return 0;
591}
592
593static int bq27x00_simple_value(int value,
594 union power_supply_propval *val)
595{
596 if (value < 0)
597 return value;
598
599 val->intval = value;
600
601 return 0;
602}
603
604#define to_bq27x00_device_info(x) container_of((x), \
605 struct bq27x00_device_info, bat);
606
607static int bq27x00_battery_get_property(struct power_supply *psy,
608 enum power_supply_property psp,
609 union power_supply_propval *val)
610{
611 int ret = 0;
612 struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
613
614 mutex_lock(&di->lock);
615 if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
616 cancel_delayed_work_sync(&di->work);
617 bq27x00_battery_poll(&di->work.work);
618 }
619 mutex_unlock(&di->lock);
620
621 if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
622 return -ENODEV;
623
624 switch (psp) {
625 case POWER_SUPPLY_PROP_STATUS:
626 ret = bq27x00_battery_status(di, val);
627 break;
628 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
629 ret = bq27x00_battery_voltage(di, val);
630 break;
631 case POWER_SUPPLY_PROP_PRESENT:
632 val->intval = di->cache.flags < 0 ? 0 : 1;
633 break;
634 case POWER_SUPPLY_PROP_CURRENT_NOW:
635 ret = bq27x00_battery_current(di, val);
636 break;
637 case POWER_SUPPLY_PROP_CAPACITY:
638 ret = bq27x00_simple_value(di->cache.capacity, val);
639 break;
640 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
641 ret = bq27x00_battery_capacity_level(di, val);
642 break;
643 case POWER_SUPPLY_PROP_TEMP:
644 ret = bq27x00_simple_value(di->cache.temperature, val);
645 break;
646 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
647 ret = bq27x00_simple_value(di->cache.time_to_empty, val);
648 break;
649 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
650 ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val);
651 break;
652 case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
653 ret = bq27x00_simple_value(di->cache.time_to_full, val);
654 break;
655 case POWER_SUPPLY_PROP_TECHNOLOGY:
656 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
657 break;
658 case POWER_SUPPLY_PROP_CHARGE_NOW:
659 ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
660 break;
661 case POWER_SUPPLY_PROP_CHARGE_FULL:
662 ret = bq27x00_simple_value(di->cache.charge_full, val);
663 break;
664 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
665 ret = bq27x00_simple_value(di->charge_design_full, val);
666 break;
667 case POWER_SUPPLY_PROP_CYCLE_COUNT:
668 ret = bq27x00_simple_value(di->cache.cycle_count, val);
669 break;
670 case POWER_SUPPLY_PROP_ENERGY_NOW:
671 ret = bq27x00_simple_value(di->cache.energy, val);
672 break;
673 case POWER_SUPPLY_PROP_POWER_AVG:
674 ret = bq27x00_simple_value(di->cache.power_avg, val);
675 break;
676 case POWER_SUPPLY_PROP_HEALTH:
677 ret = bq27x00_simple_value(di->cache.health, val);
678 break;
679 default:
680 return -EINVAL;
681 }
682
683 return ret;
684}
685
686static void bq27x00_external_power_changed(struct power_supply *psy)
687{
688 struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
689
690 cancel_delayed_work_sync(&di->work);
691 schedule_delayed_work(&di->work, 0);
692}
693
694static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
695{
696 int ret;
697
698 di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
699 di->chip = BQ27425;
700 if (di->chip == BQ27425) {
701 di->bat.properties = bq27425_battery_props;
702 di->bat.num_properties = ARRAY_SIZE(bq27425_battery_props);
703 } else {
704 di->bat.properties = bq27x00_battery_props;
705 di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
706 }
707 di->bat.get_property = bq27x00_battery_get_property;
708 di->bat.external_power_changed = bq27x00_external_power_changed;
709
710 INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
711 mutex_init(&di->lock);
712
713 ret = power_supply_register(di->dev, &di->bat);
714 if (ret) {
715 dev_err(di->dev, "failed to register battery: %d\n", ret);
716 return ret;
717 }
718
719 dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
720
721 bq27x00_update(di);
722
723 return 0;
724}
725
726static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
727{
728
729
730
731
732
733
734 poll_interval = 0;
735
736 cancel_delayed_work_sync(&di->work);
737
738 power_supply_unregister(&di->bat);
739
740 mutex_destroy(&di->lock);
741}
742
743
744
745#ifdef CONFIG_BATTERY_BQ27X00_I2C
746
747
748
749
750static DEFINE_IDR(battery_id);
751static DEFINE_MUTEX(battery_mutex);
752
753static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
754{
755 struct i2c_client *client = to_i2c_client(di->dev);
756 struct i2c_msg msg[2];
757 unsigned char data[2];
758 int ret;
759
760 if (!client->adapter)
761 return -ENODEV;
762
763 msg[0].addr = client->addr;
764 msg[0].flags = 0;
765 msg[0].buf = ®
766 msg[0].len = sizeof(reg);
767 msg[1].addr = client->addr;
768 msg[1].flags = I2C_M_RD;
769 msg[1].buf = data;
770 if (single)
771 msg[1].len = 1;
772 else
773 msg[1].len = 2;
774
775 ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
776 if (ret < 0)
777 return ret;
778
779 if (!single)
780 ret = get_unaligned_le16(data);
781 else
782 ret = data[0];
783
784 return ret;
785}
786
787static int bq27x00_battery_probe(struct i2c_client *client,
788 const struct i2c_device_id *id)
789{
790 char *name;
791 struct bq27x00_device_info *di;
792 int num;
793 int retval = 0;
794
795
796 retval = idr_pre_get(&battery_id, GFP_KERNEL);
797 if (retval == 0)
798 return -ENOMEM;
799 mutex_lock(&battery_mutex);
800 retval = idr_get_new(&battery_id, client, &num);
801 mutex_unlock(&battery_mutex);
802 if (retval < 0)
803 return retval;
804
805 name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
806 if (!name) {
807 dev_err(&client->dev, "failed to allocate device name\n");
808 retval = -ENOMEM;
809 goto batt_failed_1;
810 }
811
812 di = kzalloc(sizeof(*di), GFP_KERNEL);
813 if (!di) {
814 dev_err(&client->dev, "failed to allocate device info data\n");
815 retval = -ENOMEM;
816 goto batt_failed_2;
817 }
818
819 di->id = num;
820 di->dev = &client->dev;
821 di->chip = id->driver_data;
822 di->bat.name = name;
823 di->bus.read = &bq27x00_read_i2c;
824
825 retval = bq27x00_powersupply_init(di);
826 if (retval)
827 goto batt_failed_3;
828
829 i2c_set_clientdata(client, di);
830
831 return 0;
832
833batt_failed_3:
834 kfree(di);
835batt_failed_2:
836 kfree(name);
837batt_failed_1:
838 mutex_lock(&battery_mutex);
839 idr_remove(&battery_id, num);
840 mutex_unlock(&battery_mutex);
841
842 return retval;
843}
844
845static int bq27x00_battery_remove(struct i2c_client *client)
846{
847 struct bq27x00_device_info *di = i2c_get_clientdata(client);
848
849 bq27x00_powersupply_unregister(di);
850
851 kfree(di->bat.name);
852
853 mutex_lock(&battery_mutex);
854 idr_remove(&battery_id, di->id);
855 mutex_unlock(&battery_mutex);
856
857 kfree(di);
858
859 return 0;
860}
861
862static const struct i2c_device_id bq27x00_id[] = {
863 { "bq27200", BQ27000 },
864 { "bq27500", BQ27500 },
865 { "bq27425", BQ27425 },
866 {},
867};
868MODULE_DEVICE_TABLE(i2c, bq27x00_id);
869
870static struct i2c_driver bq27x00_battery_driver = {
871 .driver = {
872 .name = "bq27x00-battery",
873 },
874 .probe = bq27x00_battery_probe,
875 .remove = bq27x00_battery_remove,
876 .id_table = bq27x00_id,
877};
878
879static inline int bq27x00_battery_i2c_init(void)
880{
881 int ret = i2c_add_driver(&bq27x00_battery_driver);
882 if (ret)
883 printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n");
884
885 return ret;
886}
887
888static inline void bq27x00_battery_i2c_exit(void)
889{
890 i2c_del_driver(&bq27x00_battery_driver);
891}
892
893#else
894
895static inline int bq27x00_battery_i2c_init(void) { return 0; }
896static inline void bq27x00_battery_i2c_exit(void) {};
897
898#endif
899
900
901#ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
902
903static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
904 bool single)
905{
906 struct device *dev = di->dev;
907 struct bq27000_platform_data *pdata = dev->platform_data;
908 unsigned int timeout = 3;
909 int upper, lower;
910 int temp;
911
912 if (!single) {
913
914
915 upper = pdata->read(dev, reg + 1);
916 do {
917 temp = upper;
918 if (upper < 0)
919 return upper;
920
921 lower = pdata->read(dev, reg);
922 if (lower < 0)
923 return lower;
924
925 upper = pdata->read(dev, reg + 1);
926 } while (temp != upper && --timeout);
927
928 if (timeout == 0)
929 return -EIO;
930
931 return (upper << 8) | lower;
932 }
933
934 return pdata->read(dev, reg);
935}
936
937static int bq27000_battery_probe(struct platform_device *pdev)
938{
939 struct bq27x00_device_info *di;
940 struct bq27000_platform_data *pdata = pdev->dev.platform_data;
941 int ret;
942
943 if (!pdata) {
944 dev_err(&pdev->dev, "no platform_data supplied\n");
945 return -EINVAL;
946 }
947
948 if (!pdata->read) {
949 dev_err(&pdev->dev, "no hdq read callback supplied\n");
950 return -EINVAL;
951 }
952
953 di = kzalloc(sizeof(*di), GFP_KERNEL);
954 if (!di) {
955 dev_err(&pdev->dev, "failed to allocate device info data\n");
956 return -ENOMEM;
957 }
958
959 platform_set_drvdata(pdev, di);
960
961 di->dev = &pdev->dev;
962 di->chip = BQ27000;
963
964 di->bat.name = pdata->name ?: dev_name(&pdev->dev);
965 di->bus.read = &bq27000_read_platform;
966
967 ret = bq27x00_powersupply_init(di);
968 if (ret)
969 goto err_free;
970
971 return 0;
972
973err_free:
974 platform_set_drvdata(pdev, NULL);
975 kfree(di);
976
977 return ret;
978}
979
980static int bq27000_battery_remove(struct platform_device *pdev)
981{
982 struct bq27x00_device_info *di = platform_get_drvdata(pdev);
983
984 bq27x00_powersupply_unregister(di);
985
986 platform_set_drvdata(pdev, NULL);
987 kfree(di);
988
989 return 0;
990}
991
992static struct platform_driver bq27000_battery_driver = {
993 .probe = bq27000_battery_probe,
994 .remove = bq27000_battery_remove,
995 .driver = {
996 .name = "bq27000-battery",
997 .owner = THIS_MODULE,
998 },
999};
1000
1001static inline int bq27x00_battery_platform_init(void)
1002{
1003 int ret = platform_driver_register(&bq27000_battery_driver);
1004 if (ret)
1005 printk(KERN_ERR "Unable to register BQ27000 platform driver\n");
1006
1007 return ret;
1008}
1009
1010static inline void bq27x00_battery_platform_exit(void)
1011{
1012 platform_driver_unregister(&bq27000_battery_driver);
1013}
1014
1015#else
1016
1017static inline int bq27x00_battery_platform_init(void) { return 0; }
1018static inline void bq27x00_battery_platform_exit(void) {};
1019
1020#endif
1021
1022
1023
1024
1025
1026static int __init bq27x00_battery_init(void)
1027{
1028 int ret;
1029
1030 ret = bq27x00_battery_i2c_init();
1031 if (ret)
1032 return ret;
1033
1034 ret = bq27x00_battery_platform_init();
1035 if (ret)
1036 bq27x00_battery_i2c_exit();
1037
1038 return ret;
1039}
1040module_init(bq27x00_battery_init);
1041
1042static void __exit bq27x00_battery_exit(void)
1043{
1044 bq27x00_battery_platform_exit();
1045 bq27x00_battery_i2c_exit();
1046}
1047module_exit(bq27x00_battery_exit);
1048
1049MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1050MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
1051MODULE_LICENSE("GPL");
1052
