tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * BQ27x00 battery driver
3 *
4 * Copyright (C) 2008 Rodolfo Giometti <giometti@linux.it>
5 * Copyright (C) 2008 Eurotech S.p.A. <info@eurotech.it>
6 * Copyright (C) 2010-2011 Lars-Peter Clausen <lars@metafoo.de>
7 * Copyright (C) 2011 Pali Rohár <pali.rohar@gmail.com>
8 *
9 * Based on a previous work by Copyright (C) 2008 Texas Instruments, Inc.
10 *
11 * This package is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 *
15 * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
17 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
18 *
19 */
20
21/*
22 * Datasheets:
23 * http://focus.ti.com/docs/prod/folders/print/bq27000.html
24 * http://focus.ti.com/docs/prod/folders/print/bq27500.html
25 * http://www.ti.com/product/bq27425-g1
26 */
27
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 /* Nominal available capacity */
52#define BQ27x00_REG_LMD 0x12 /* Last measured discharge */
53#define BQ27x00_REG_CYCT 0x2A /* Cycle count total */
54#define BQ27x00_REG_AE 0x22 /* Available energy */
55#define BQ27x00_POWER_AVG 0x24
56
57#define BQ27000_REG_RSOC 0x0B /* Relative State-of-Charge */
58#define BQ27000_REG_ILMD 0x76 /* Initial last measured discharge */
59#define BQ27000_FLAG_EDVF BIT(0) /* Final End-of-Discharge-Voltage flag */
60#define BQ27000_FLAG_EDV1 BIT(1) /* First End-of-Discharge-Voltage flag */
61#define BQ27000_FLAG_CI BIT(4) /* Capacity Inaccurate flag */
62#define BQ27000_FLAG_FC BIT(5)
63#define BQ27000_FLAG_CHGS BIT(7) /* Charge state flag */
64
65#define BQ27500_REG_SOC 0x2C
66#define BQ27500_REG_DCAP 0x3C /* Design capacity */
67#define BQ27500_FLAG_DSC BIT(0)
68#define BQ27500_FLAG_SOCF BIT(1) /* State-of-Charge threshold final */
69#define BQ27500_FLAG_SOC1 BIT(2) /* State-of-Charge threshold 1 */
70#define BQ27500_FLAG_FC BIT(9)
71#define BQ27500_FLAG_OTC BIT(15)
72
73/* bq27425 register addresses are same as bq27x00 addresses minus 4 */
74#define BQ27425_REG_OFFSET 0x04
75#define BQ27425_REG_SOC 0x18 /* Register address plus offset */
76
77#define BQ27000_RS 20 /* Resistor sense */
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 * Common code for BQ27x00 devices
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 * Higher versions of the chip like BQ27425 and BQ27500
173 * differ from BQ27000 and BQ27200 in calculation of certain
174 * parameters. Hence we need to check for the chip type.
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 * Return the battery Relative State-of-Charge
185 * Or < 0 if something fails.
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 * Return a battery charge value in µAh
206 * Or < 0 if something fails.
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 * Return the battery Nominal available capaciy in µAh
229 * Or < 0 if something fails.
230 */
231static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
232{
233 return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
234}
235
236/*
237 * Return the battery Last measured discharge in µAh
238 * Or < 0 if something fails.
239 */
240static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
241{
242 return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD);
243}
244
245/*
246 * Return the battery Initial last measured discharge in µAh
247 * Or < 0 if something fails.
248 */
249static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
250{
251 int ilmd;
252
253 if (bq27xxx_is_chip_version_higher(di))
254 ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
255 else
256 ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);
257
258 if (ilmd < 0) {
259 dev_dbg(di->dev, "error reading initial last measured discharge\n");
260 return ilmd;
261 }
262
263 if (bq27xxx_is_chip_version_higher(di))
264 ilmd *= 1000;
265 else
266 ilmd = ilmd * 256 * 3570 / BQ27000_RS;
267
268 return ilmd;
269}
270
271/*
272 * Return the battery Available energy in µWh
273 * Or < 0 if something fails.
274 */
275static int bq27x00_battery_read_energy(struct bq27x00_device_info *di)
276{
277 int ae;
278
279 ae = bq27x00_read(di, BQ27x00_REG_AE, false);
280 if (ae < 0) {
281 dev_dbg(di->dev, "error reading available energy\n");
282 return ae;
283 }
284
285 if (di->chip == BQ27500)
286 ae *= 1000;
287 else
288 ae = ae * 29200 / BQ27000_RS;
289
290 return ae;
291}
292
293/*
294 * Return the battery temperature in tenths of degree Celsius
295 * Or < 0 if something fails.
296 */
297static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di)
298{
299 int temp;
300
301 temp = bq27x00_read(di, BQ27x00_REG_TEMP, false);
302 if (temp < 0) {
303 dev_err(di->dev, "error reading temperature\n");
304 return temp;
305 }
306
307 if (bq27xxx_is_chip_version_higher(di))
308 temp -= 2731;
309 else
310 temp = ((temp * 5) - 5463) / 2;
311
312 return temp;
313}
314
315/*
316 * Return the battery Cycle count total
317 * Or < 0 if something fails.
318 */
319static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
320{
321 int cyct;
322
323 cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
324 if (cyct < 0)
325 dev_err(di->dev, "error reading cycle count total\n");
326
327 return cyct;
328}
329
330/*
331 * Read a time register.
332 * Return < 0 if something fails.
333 */
334static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
335{
336 int tval;
337
338 tval = bq27x00_read(di, reg, false);
339 if (tval < 0) {
340 dev_dbg(di->dev, "error reading time register %02x: %d\n",
341 reg, tval);
342 return tval;
343 }
344
345 if (tval == 65535)
346 return -ENODATA;
347
348 return tval * 60;
349}
350
351/*
352 * Read a power avg register.
353 * Return < 0 if something fails.
354 */
355static int bq27x00_battery_read_pwr_avg(struct bq27x00_device_info *di, u8 reg)
356{
357 int tval;
358
359 tval = bq27x00_read(di, reg, false);
360 if (tval < 0) {
361 dev_err(di->dev, "error reading power avg rgister %02x: %d\n",
362 reg, tval);
363 return tval;
364 }
365
366 if (di->chip == BQ27500)
367 return tval;
368 else
369 return (tval * BQ27x00_POWER_CONSTANT) / BQ27000_RS;
370}
371
372/*
373 * Read flag register.
374 * Return < 0 if something fails.
375 */
376static int bq27x00_battery_read_health(struct bq27x00_device_info *di)
377{
378 int tval;
379
380 tval = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
381 if (tval < 0) {
382 dev_err(di->dev, "error reading flag register:%d\n", tval);
383 return tval;
384 }
385
386 if ((di->chip == BQ27500)) {
387 if (tval & BQ27500_FLAG_SOCF)
388 tval = POWER_SUPPLY_HEALTH_DEAD;
389 else if (tval & BQ27500_FLAG_OTC)
390 tval = POWER_SUPPLY_HEALTH_OVERHEAT;
391 else
392 tval = POWER_SUPPLY_HEALTH_GOOD;
393 return tval;
394 } else {
395 if (tval & BQ27000_FLAG_EDV1)
396 tval = POWER_SUPPLY_HEALTH_DEAD;
397 else
398 tval = POWER_SUPPLY_HEALTH_GOOD;
399 return tval;
400 }
401
402 return -1;
403}
404
405static void bq27x00_update(struct bq27x00_device_info *di)
406{
407 struct bq27x00_reg_cache cache = {0, };
408 bool is_bq27500 = di->chip == BQ27500;
409 bool is_bq27425 = di->chip == BQ27425;
410
411 cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500);
412 if (cache.flags >= 0) {
413 if (!is_bq27500 && !is_bq27425
414 && (cache.flags & BQ27000_FLAG_CI)) {
415 dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
416 cache.capacity = -ENODATA;
417 cache.energy = -ENODATA;
418 cache.time_to_empty = -ENODATA;
419 cache.time_to_empty_avg = -ENODATA;
420 cache.time_to_full = -ENODATA;
421 cache.charge_full = -ENODATA;
422 cache.health = -ENODATA;
423 } else {
424 cache.capacity = bq27x00_battery_read_rsoc(di);
425 if (!is_bq27425) {
426 cache.energy = bq27x00_battery_read_energy(di);
427 cache.time_to_empty =
428 bq27x00_battery_read_time(di,
429 BQ27x00_REG_TTE);
430 cache.time_to_empty_avg =
431 bq27x00_battery_read_time(di,
432 BQ27x00_REG_TTECP);
433 cache.time_to_full =
434 bq27x00_battery_read_time(di,
435 BQ27x00_REG_TTF);
436 }
437 cache.charge_full = bq27x00_battery_read_lmd(di);
438 cache.health = bq27x00_battery_read_health(di);
439 }
440 cache.temperature = bq27x00_battery_read_temperature(di);
441 if (!is_bq27425)
442 cache.cycle_count = bq27x00_battery_read_cyct(di);
443 cache.cycle_count = bq27x00_battery_read_cyct(di);
444 cache.power_avg =
445 bq27x00_battery_read_pwr_avg(di, BQ27x00_POWER_AVG);
446
447 /* We only have to read charge design full once */
448 if (di->charge_design_full <= 0)
449 di->charge_design_full = bq27x00_battery_read_ilmd(di);
450 }
451
452 if (memcmp(&di->cache, &cache, sizeof(cache)) != 0) {
453 di->cache = cache;
454 power_supply_changed(&di->bat);
455 }
456
457 di->last_update = jiffies;
458}
459
460static void bq27x00_battery_poll(struct work_struct *work)
461{
462 struct bq27x00_device_info *di =
463 container_of(work, struct bq27x00_device_info, work.work);
464
465 bq27x00_update(di);
466
467 if (poll_interval > 0) {
468 /* The timer does not have to be accurate. */
469 set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
470 schedule_delayed_work(&di->work, poll_interval * HZ);
471 }
472}
473
474/*
475 * Return the battery average current in µA
476 * Note that current can be negative signed as well
477 * Or 0 if something fails.
478 */
479static int bq27x00_battery_current(struct bq27x00_device_info *di,
480 union power_supply_propval *val)
481{
482 int curr;
483 int flags;
484
485 curr = bq27x00_read(di, BQ27x00_REG_AI, false);
486 if (curr < 0) {
487 dev_err(di->dev, "error reading current\n");
488 return curr;
489 }
490
491 if (bq27xxx_is_chip_version_higher(di)) {
492 /* bq27500 returns signed value */
493 val->intval = (int)((s16)curr) * 1000;
494 } else {
495 flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
496 if (flags & BQ27000_FLAG_CHGS) {
497 dev_dbg(di->dev, "negative current!\n");
498 curr = -curr;
499 }
500
501 val->intval = curr * 3570 / BQ27000_RS;
502 }
503
504 return 0;
505}
506
507static int bq27x00_battery_status(struct bq27x00_device_info *di,
508 union power_supply_propval *val)
509{
510 int status;
511
512 if (bq27xxx_is_chip_version_higher(di)) {
513 if (di->cache.flags & BQ27500_FLAG_FC)
514 status = POWER_SUPPLY_STATUS_FULL;
515 else if (di->cache.flags & BQ27500_FLAG_DSC)
516 status = POWER_SUPPLY_STATUS_DISCHARGING;
517 else
518 status = POWER_SUPPLY_STATUS_CHARGING;
519 } else {
520 if (di->cache.flags & BQ27000_FLAG_FC)
521 status = POWER_SUPPLY_STATUS_FULL;
522 else if (di->cache.flags & BQ27000_FLAG_CHGS)
523 status = POWER_SUPPLY_STATUS_CHARGING;
524 else if (power_supply_am_i_supplied(&di->bat))
525 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
526 else
527 status = POWER_SUPPLY_STATUS_DISCHARGING;
528 }
529
530 val->intval = status;
531
532 return 0;
533}
534
535static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di,
536 union power_supply_propval *val)
537{
538 int level;
539
540 if (bq27xxx_is_chip_version_higher(di)) {
541 if (di->cache.flags & BQ27500_FLAG_FC)
542 level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
543 else if (di->cache.flags & BQ27500_FLAG_SOC1)
544 level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
545 else if (di->cache.flags & BQ27500_FLAG_SOCF)
546 level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
547 else
548 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
549 } else {
550 if (di->cache.flags & BQ27000_FLAG_FC)
551 level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
552 else if (di->cache.flags & BQ27000_FLAG_EDV1)
553 level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
554 else if (di->cache.flags & BQ27000_FLAG_EDVF)
555 level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
556 else
557 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
558 }
559
560 val->intval = level;
561
562 return 0;
563}
564
565/*
566 * Return the battery Voltage in millivolts
567 * Or < 0 if something fails.
568 */
569static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
570 union power_supply_propval *val)
571{
572 int volt;
573
574 volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
575 if (volt < 0) {
576 dev_err(di->dev, "error reading voltage\n");
577 return volt;
578 }
579
580 val->intval = volt * 1000;
581
582 return 0;
583}
584
585static int bq27x00_simple_value(int value,
586 union power_supply_propval *val)
587{
588 if (value < 0)
589 return value;
590
591 val->intval = value;
592
593 return 0;
594}
595
596#define to_bq27x00_device_info(x) container_of((x), \
597 struct bq27x00_device_info, bat);
598
599static int bq27x00_battery_get_property(struct power_supply *psy,
600 enum power_supply_property psp,
601 union power_supply_propval *val)
602{
603 int ret = 0;
604 struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
605
606 mutex_lock(&di->lock);
607 if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
608 cancel_delayed_work_sync(&di->work);
609 bq27x00_battery_poll(&di->work.work);
610 }
611 mutex_unlock(&di->lock);
612
613 if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
614 return -ENODEV;
615
616 switch (psp) {
617 case POWER_SUPPLY_PROP_STATUS:
618 ret = bq27x00_battery_status(di, val);
619 break;
620 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
621 ret = bq27x00_battery_voltage(di, val);
622 break;
623 case POWER_SUPPLY_PROP_PRESENT:
624 val->intval = di->cache.flags < 0 ? 0 : 1;
625 break;
626 case POWER_SUPPLY_PROP_CURRENT_NOW:
627 ret = bq27x00_battery_current(di, val);
628 break;
629 case POWER_SUPPLY_PROP_CAPACITY:
630 ret = bq27x00_simple_value(di->cache.capacity, val);
631 break;
632 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
633 ret = bq27x00_battery_capacity_level(di, val);
634 break;
635 case POWER_SUPPLY_PROP_TEMP:
636 ret = bq27x00_simple_value(di->cache.temperature, val);
637 break;
638 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
639 ret = bq27x00_simple_value(di->cache.time_to_empty, val);
640 break;
641 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
642 ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val);
643 break;
644 case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
645 ret = bq27x00_simple_value(di->cache.time_to_full, val);
646 break;
647 case POWER_SUPPLY_PROP_TECHNOLOGY:
648 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
649 break;
650 case POWER_SUPPLY_PROP_CHARGE_NOW:
651 ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
652 break;
653 case POWER_SUPPLY_PROP_CHARGE_FULL:
654 ret = bq27x00_simple_value(di->cache.charge_full, val);
655 break;
656 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
657 ret = bq27x00_simple_value(di->charge_design_full, val);
658 break;
659 case POWER_SUPPLY_PROP_CYCLE_COUNT:
660 ret = bq27x00_simple_value(di->cache.cycle_count, val);
661 break;
662 case POWER_SUPPLY_PROP_ENERGY_NOW:
663 ret = bq27x00_simple_value(di->cache.energy, val);
664 break;
665 case POWER_SUPPLY_PROP_POWER_AVG:
666 ret = bq27x00_simple_value(di->cache.power_avg, val);
667 break;
668 case POWER_SUPPLY_PROP_HEALTH:
669 ret = bq27x00_simple_value(di->cache.health, val);
670 break;
671 default:
672 return -EINVAL;
673 }
674
675 return ret;
676}
677
678static void bq27x00_external_power_changed(struct power_supply *psy)
679{
680 struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
681
682 cancel_delayed_work_sync(&di->work);
683 schedule_delayed_work(&di->work, 0);
684}
685
686static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
687{
688 int ret;
689
690 di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
691 di->chip = BQ27425;
692 if (di->chip == BQ27425) {
693 di->bat.properties = bq27425_battery_props;
694 di->bat.num_properties = ARRAY_SIZE(bq27425_battery_props);
695 } else {
696 di->bat.properties = bq27x00_battery_props;
697 di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
698 }
699 di->bat.get_property = bq27x00_battery_get_property;
700 di->bat.external_power_changed = bq27x00_external_power_changed;
701
702 INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
703 mutex_init(&di->lock);
704
705 ret = power_supply_register(di->dev, &di->bat);
706 if (ret) {
707 dev_err(di->dev, "failed to register battery: %d\n", ret);
708 return ret;
709 }
710
711 dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
712
713 bq27x00_update(di);
714
715 return 0;
716}
717
718static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
719{
720 /*
721 * power_supply_unregister call bq27x00_battery_get_property which
722 * call bq27x00_battery_poll.
723 * Make sure that bq27x00_battery_poll will not call
724 * schedule_delayed_work again after unregister (which cause OOPS).
725 */
726 poll_interval = 0;
727
728 cancel_delayed_work_sync(&di->work);
729
730 power_supply_unregister(&di->bat);
731
732 mutex_destroy(&di->lock);
733}
734
735
736/* i2c specific code */
737#ifdef CONFIG_BATTERY_BQ27X00_I2C
738
739/* If the system has several batteries we need a different name for each
740 * of them...
741 */
742static DEFINE_IDR(battery_id);
743static DEFINE_MUTEX(battery_mutex);
744
745static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
746{
747 struct i2c_client *client = to_i2c_client(di->dev);
748 struct i2c_msg msg[2];
749 unsigned char data[2];
750 int ret;
751
752 if (!client->adapter)
753 return -ENODEV;
754
755 msg[0].addr = client->addr;
756 msg[0].flags = 0;
757 msg[0].buf = ®
758 msg[0].len = sizeof(reg);
759 msg[1].addr = client->addr;
760 msg[1].flags = I2C_M_RD;
761 msg[1].buf = data;
762 if (single)
763 msg[1].len = 1;
764 else
765 msg[1].len = 2;
766
767 ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
768 if (ret < 0)
769 return ret;
770
771 if (!single)
772 ret = get_unaligned_le16(data);
773 else
774 ret = data[0];
775
776 return ret;
777}
778
779static int bq27x00_battery_probe(struct i2c_client *client,
780 const struct i2c_device_id *id)
781{
782 char *name;
783 struct bq27x00_device_info *di;
784 int num;
785 int retval = 0;
786
787 /* Get new ID for the new battery device */
788 retval = idr_pre_get(&battery_id, GFP_KERNEL);
789 if (retval == 0)
790 return -ENOMEM;
791 mutex_lock(&battery_mutex);
792 retval = idr_get_new(&battery_id, client, &num);
793 mutex_unlock(&battery_mutex);
794 if (retval < 0)
795 return retval;
796
797 name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
798 if (!name) {
799 dev_err(&client->dev, "failed to allocate device name\n");
800 retval = -ENOMEM;
801 goto batt_failed_1;
802 }
803
804 di = kzalloc(sizeof(*di), GFP_KERNEL);
805 if (!di) {
806 dev_err(&client->dev, "failed to allocate device info data\n");
807 retval = -ENOMEM;
808 goto batt_failed_2;
809 }
810
811 di->id = num;
812 di->dev = &client->dev;
813 di->chip = id->driver_data;
814 di->bat.name = name;
815 di->bus.read = &bq27x00_read_i2c;
816
817 if (bq27x00_powersupply_init(di))
818 goto batt_failed_3;
819
820 i2c_set_clientdata(client, di);
821
822 return 0;
823
824batt_failed_3:
825 kfree(di);
826batt_failed_2:
827 kfree(name);
828batt_failed_1:
829 mutex_lock(&battery_mutex);
830 idr_remove(&battery_id, num);
831 mutex_unlock(&battery_mutex);
832
833 return retval;
834}
835
836static int bq27x00_battery_remove(struct i2c_client *client)
837{
838 struct bq27x00_device_info *di = i2c_get_clientdata(client);
839
840 bq27x00_powersupply_unregister(di);
841
842 kfree(di->bat.name);
843
844 mutex_lock(&battery_mutex);
845 idr_remove(&battery_id, di->id);
846 mutex_unlock(&battery_mutex);
847
848 kfree(di);
849
850 return 0;
851}
852
853static const struct i2c_device_id bq27x00_id[] = {
854 { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
855 { "bq27500", BQ27500 },
856 { "bq27425", BQ27425 },
857 {},
858};
859MODULE_DEVICE_TABLE(i2c, bq27x00_id);
860
861static struct i2c_driver bq27x00_battery_driver = {
862 .driver = {
863 .name = "bq27x00-battery",
864 },
865 .probe = bq27x00_battery_probe,
866 .remove = bq27x00_battery_remove,
867 .id_table = bq27x00_id,
868};
869
870static inline int bq27x00_battery_i2c_init(void)
871{
872 int ret = i2c_add_driver(&bq27x00_battery_driver);
873 if (ret)
874 printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n");
875
876 return ret;
877}
878
879static inline void bq27x00_battery_i2c_exit(void)
880{
881 i2c_del_driver(&bq27x00_battery_driver);
882}
883
884#else
885
886static inline int bq27x00_battery_i2c_init(void) { return 0; }
887static inline void bq27x00_battery_i2c_exit(void) {};
888
889#endif
890
891/* platform specific code */
892#ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
893
894static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
895 bool single)
896{
897 struct device *dev = di->dev;
898 struct bq27000_platform_data *pdata = dev->platform_data;
899 unsigned int timeout = 3;
900 int upper, lower;
901 int temp;
902
903 if (!single) {
904 /* Make sure the value has not changed in between reading the
905 * lower and the upper part */
906 upper = pdata->read(dev, reg + 1);
907 do {
908 temp = upper;
909 if (upper < 0)
910 return upper;
911
912 lower = pdata->read(dev, reg);
913 if (lower < 0)
914 return lower;
915
916 upper = pdata->read(dev, reg + 1);
917 } while (temp != upper && --timeout);
918
919 if (timeout == 0)
920 return -EIO;
921
922 return (upper << 8) | lower;
923 }
924
925 return pdata->read(dev, reg);
926}
927
928static int __devinit bq27000_battery_probe(struct platform_device *pdev)
929{
930 struct bq27x00_device_info *di;
931 struct bq27000_platform_data *pdata = pdev->dev.platform_data;
932 int ret;
933
934 if (!pdata) {
935 dev_err(&pdev->dev, "no platform_data supplied\n");
936 return -EINVAL;
937 }
938
939 if (!pdata->read) {
940 dev_err(&pdev->dev, "no hdq read callback supplied\n");
941 return -EINVAL;
942 }
943
944 di = kzalloc(sizeof(*di), GFP_KERNEL);
945 if (!di) {
946 dev_err(&pdev->dev, "failed to allocate device info data\n");
947 return -ENOMEM;
948 }
949
950 platform_set_drvdata(pdev, di);
951
952 di->dev = &pdev->dev;
953 di->chip = BQ27000;
954
955 di->bat.name = pdata->name ?: dev_name(&pdev->dev);
956 di->bus.read = &bq27000_read_platform;
957
958 ret = bq27x00_powersupply_init(di);
959 if (ret)
960 goto err_free;
961
962 return 0;
963
964err_free:
965 platform_set_drvdata(pdev, NULL);
966 kfree(di);
967
968 return ret;
969}
970
971static int __devexit bq27000_battery_remove(struct platform_device *pdev)
972{
973 struct bq27x00_device_info *di = platform_get_drvdata(pdev);
974
975 bq27x00_powersupply_unregister(di);
976
977 platform_set_drvdata(pdev, NULL);
978 kfree(di);
979
980 return 0;
981}
982
983static struct platform_driver bq27000_battery_driver = {
984 .probe = bq27000_battery_probe,
985 .remove = __devexit_p(bq27000_battery_remove),
986 .driver = {
987 .name = "bq27000-battery",
988 .owner = THIS_MODULE,
989 },
990};
991
992static inline int bq27x00_battery_platform_init(void)
993{
994 int ret = platform_driver_register(&bq27000_battery_driver);
995 if (ret)
996 printk(KERN_ERR "Unable to register BQ27000 platform driver\n");
997
998 return ret;
999}
1000
1001static inline void bq27x00_battery_platform_exit(void)
1002{
1003 platform_driver_unregister(&bq27000_battery_driver);
1004}
1005
1006#else
1007
1008static inline int bq27x00_battery_platform_init(void) { return 0; }
1009static inline void bq27x00_battery_platform_exit(void) {};
1010
1011#endif
1012
1013/*
1014 * Module stuff
1015 */
1016
1017static int __init bq27x00_battery_init(void)
1018{
1019 int ret;
1020
1021 ret = bq27x00_battery_i2c_init();
1022 if (ret)
1023 return ret;
1024
1025 ret = bq27x00_battery_platform_init();
1026 if (ret)
1027 bq27x00_battery_i2c_exit();
1028
1029 return ret;
1030}
1031module_init(bq27x00_battery_init);
1032
1033static void __exit bq27x00_battery_exit(void)
1034{
1035 bq27x00_battery_platform_exit();
1036 bq27x00_battery_i2c_exit();
1037}
1038module_exit(bq27x00_battery_exit);
1039
1040MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1041MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
1042MODULE_LICENSE("GPL");