tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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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 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 * Return the battery Last measured discharge in µAh
246 * Or < 0 if something fails.
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 * Return the battery Initial last measured discharge in µAh
255 * Or < 0 if something fails.
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 * Return the battery Available energy in µWh
281 * Or < 0 if something fails.
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 * Return the battery temperature in tenths of degree Kelvin
303 * Or < 0 if something fails.
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 = 5 * temp / 2;
317
318 return temp;
319}
320
321/*
322 * Return the battery Cycle count total
323 * Or < 0 if something fails.
324 */
325static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
326{
327 int cyct;
328
329 cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
330 if (cyct < 0)
331 dev_err(di->dev, "error reading cycle count total\n");
332
333 return cyct;
334}
335
336/*
337 * Read a time register.
338 * Return < 0 if something fails.
339 */
340static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
341{
342 int tval;
343
344 tval = bq27x00_read(di, reg, false);
345 if (tval < 0) {
346 dev_dbg(di->dev, "error reading time register %02x: %d\n",
347 reg, tval);
348 return tval;
349 }
350
351 if (tval == 65535)
352 return -ENODATA;
353
354 return tval * 60;
355}
356
357/*
358 * Read a power avg register.
359 * Return < 0 if something fails.
360 */
361static int bq27x00_battery_read_pwr_avg(struct bq27x00_device_info *di, u8 reg)
362{
363 int tval;
364
365 tval = bq27x00_read(di, reg, false);
366 if (tval < 0) {
367 dev_err(di->dev, "error reading power avg rgister %02x: %d\n",
368 reg, tval);
369 return tval;
370 }
371
372 if (di->chip == BQ27500)
373 return tval;
374 else
375 return (tval * BQ27x00_POWER_CONSTANT) / BQ27000_RS;
376}
377
378/*
379 * Read flag register.
380 * Return < 0 if something fails.
381 */
382static int bq27x00_battery_read_health(struct bq27x00_device_info *di)
383{
384 int tval;
385
386 tval = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
387 if (tval < 0) {
388 dev_err(di->dev, "error reading flag register:%d\n", tval);
389 return tval;
390 }
391
392 if ((di->chip == BQ27500)) {
393 if (tval & BQ27500_FLAG_SOCF)
394 tval = POWER_SUPPLY_HEALTH_DEAD;
395 else if (tval & BQ27500_FLAG_OTC)
396 tval = POWER_SUPPLY_HEALTH_OVERHEAT;
397 else
398 tval = POWER_SUPPLY_HEALTH_GOOD;
399 return tval;
400 } else {
401 if (tval & BQ27000_FLAG_EDV1)
402 tval = POWER_SUPPLY_HEALTH_DEAD;
403 else
404 tval = POWER_SUPPLY_HEALTH_GOOD;
405 return tval;
406 }
407
408 return -1;
409}
410
411static void bq27x00_update(struct bq27x00_device_info *di)
412{
413 struct bq27x00_reg_cache cache = {0, };
414 bool is_bq27500 = di->chip == BQ27500;
415 bool is_bq27425 = di->chip == BQ27425;
416
417 cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500);
418 if (cache.flags >= 0) {
419 if (!is_bq27500 && !is_bq27425
420 && (cache.flags & BQ27000_FLAG_CI)) {
421 dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
422 cache.capacity = -ENODATA;
423 cache.energy = -ENODATA;
424 cache.time_to_empty = -ENODATA;
425 cache.time_to_empty_avg = -ENODATA;
426 cache.time_to_full = -ENODATA;
427 cache.charge_full = -ENODATA;
428 cache.health = -ENODATA;
429 } else {
430 cache.capacity = bq27x00_battery_read_rsoc(di);
431 if (!is_bq27425) {
432 cache.energy = bq27x00_battery_read_energy(di);
433 cache.time_to_empty =
434 bq27x00_battery_read_time(di,
435 BQ27x00_REG_TTE);
436 cache.time_to_empty_avg =
437 bq27x00_battery_read_time(di,
438 BQ27x00_REG_TTECP);
439 cache.time_to_full =
440 bq27x00_battery_read_time(di,
441 BQ27x00_REG_TTF);
442 }
443 cache.charge_full = bq27x00_battery_read_lmd(di);
444 cache.health = bq27x00_battery_read_health(di);
445 }
446 cache.temperature = bq27x00_battery_read_temperature(di);
447 if (!is_bq27425)
448 cache.cycle_count = bq27x00_battery_read_cyct(di);
449 cache.power_avg =
450 bq27x00_battery_read_pwr_avg(di, BQ27x00_POWER_AVG);
451
452 /* We only have to read charge design full once */
453 if (di->charge_design_full <= 0)
454 di->charge_design_full = bq27x00_battery_read_ilmd(di);
455 }
456
457 if (memcmp(&di->cache, &cache, sizeof(cache)) != 0) {
458 di->cache = cache;
459 power_supply_changed(&di->bat);
460 }
461
462 di->last_update = jiffies;
463}
464
465static void bq27x00_battery_poll(struct work_struct *work)
466{
467 struct bq27x00_device_info *di =
468 container_of(work, struct bq27x00_device_info, work.work);
469
470 bq27x00_update(di);
471
472 if (poll_interval > 0) {
473 /* The timer does not have to be accurate. */
474 set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
475 schedule_delayed_work(&di->work, poll_interval * HZ);
476 }
477}
478
479/*
480 * Return the battery average current in µA
481 * Note that current can be negative signed as well
482 * Or 0 if something fails.
483 */
484static int bq27x00_battery_current(struct bq27x00_device_info *di,
485 union power_supply_propval *val)
486{
487 int curr;
488 int flags;
489
490 curr = bq27x00_read(di, BQ27x00_REG_AI, false);
491 if (curr < 0) {
492 dev_err(di->dev, "error reading current\n");
493 return curr;
494 }
495
496 if (bq27xxx_is_chip_version_higher(di)) {
497 /* bq27500 returns signed value */
498 val->intval = (int)((s16)curr) * 1000;
499 } else {
500 flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
501 if (flags & BQ27000_FLAG_CHGS) {
502 dev_dbg(di->dev, "negative current!\n");
503 curr = -curr;
504 }
505
506 val->intval = curr * 3570 / BQ27000_RS;
507 }
508
509 return 0;
510}
511
512static int bq27x00_battery_status(struct bq27x00_device_info *di,
513 union power_supply_propval *val)
514{
515 int status;
516
517 if (bq27xxx_is_chip_version_higher(di)) {
518 if (di->cache.flags & BQ27500_FLAG_FC)
519 status = POWER_SUPPLY_STATUS_FULL;
520 else if (di->cache.flags & BQ27500_FLAG_DSC)
521 status = POWER_SUPPLY_STATUS_DISCHARGING;
522 else
523 status = POWER_SUPPLY_STATUS_CHARGING;
524 } else {
525 if (di->cache.flags & BQ27000_FLAG_FC)
526 status = POWER_SUPPLY_STATUS_FULL;
527 else if (di->cache.flags & BQ27000_FLAG_CHGS)
528 status = POWER_SUPPLY_STATUS_CHARGING;
529 else if (power_supply_am_i_supplied(&di->bat))
530 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
531 else
532 status = POWER_SUPPLY_STATUS_DISCHARGING;
533 }
534
535 val->intval = status;
536
537 return 0;
538}
539
540static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di,
541 union power_supply_propval *val)
542{
543 int level;
544
545 if (bq27xxx_is_chip_version_higher(di)) {
546 if (di->cache.flags & BQ27500_FLAG_FC)
547 level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
548 else if (di->cache.flags & BQ27500_FLAG_SOC1)
549 level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
550 else if (di->cache.flags & BQ27500_FLAG_SOCF)
551 level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
552 else
553 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
554 } else {
555 if (di->cache.flags & BQ27000_FLAG_FC)
556 level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
557 else if (di->cache.flags & BQ27000_FLAG_EDV1)
558 level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
559 else if (di->cache.flags & BQ27000_FLAG_EDVF)
560 level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
561 else
562 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
563 }
564
565 val->intval = level;
566
567 return 0;
568}
569
570/*
571 * Return the battery Voltage in millivolts
572 * Or < 0 if something fails.
573 */
574static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
575 union power_supply_propval *val)
576{
577 int volt;
578
579 volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
580 if (volt < 0) {
581 dev_err(di->dev, "error reading voltage\n");
582 return volt;
583 }
584
585 val->intval = volt * 1000;
586
587 return 0;
588}
589
590static int bq27x00_simple_value(int value,
591 union power_supply_propval *val)
592{
593 if (value < 0)
594 return value;
595
596 val->intval = value;
597
598 return 0;
599}
600
601#define to_bq27x00_device_info(x) container_of((x), \
602 struct bq27x00_device_info, bat);
603
604static int bq27x00_battery_get_property(struct power_supply *psy,
605 enum power_supply_property psp,
606 union power_supply_propval *val)
607{
608 int ret = 0;
609 struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
610
611 mutex_lock(&di->lock);
612 if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
613 cancel_delayed_work_sync(&di->work);
614 bq27x00_battery_poll(&di->work.work);
615 }
616 mutex_unlock(&di->lock);
617
618 if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
619 return -ENODEV;
620
621 switch (psp) {
622 case POWER_SUPPLY_PROP_STATUS:
623 ret = bq27x00_battery_status(di, val);
624 break;
625 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
626 ret = bq27x00_battery_voltage(di, val);
627 break;
628 case POWER_SUPPLY_PROP_PRESENT:
629 val->intval = di->cache.flags < 0 ? 0 : 1;
630 break;
631 case POWER_SUPPLY_PROP_CURRENT_NOW:
632 ret = bq27x00_battery_current(di, val);
633 break;
634 case POWER_SUPPLY_PROP_CAPACITY:
635 ret = bq27x00_simple_value(di->cache.capacity, val);
636 break;
637 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
638 ret = bq27x00_battery_capacity_level(di, val);
639 break;
640 case POWER_SUPPLY_PROP_TEMP:
641 ret = bq27x00_simple_value(di->cache.temperature, val);
642 if (ret == 0)
643 val->intval -= 2731;
644 break;
645 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
646 ret = bq27x00_simple_value(di->cache.time_to_empty, val);
647 break;
648 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
649 ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val);
650 break;
651 case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
652 ret = bq27x00_simple_value(di->cache.time_to_full, val);
653 break;
654 case POWER_SUPPLY_PROP_TECHNOLOGY:
655 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
656 break;
657 case POWER_SUPPLY_PROP_CHARGE_NOW:
658 ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
659 break;
660 case POWER_SUPPLY_PROP_CHARGE_FULL:
661 ret = bq27x00_simple_value(di->cache.charge_full, val);
662 break;
663 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
664 ret = bq27x00_simple_value(di->charge_design_full, val);
665 break;
666 case POWER_SUPPLY_PROP_CYCLE_COUNT:
667 ret = bq27x00_simple_value(di->cache.cycle_count, val);
668 break;
669 case POWER_SUPPLY_PROP_ENERGY_NOW:
670 ret = bq27x00_simple_value(di->cache.energy, val);
671 break;
672 case POWER_SUPPLY_PROP_POWER_AVG:
673 ret = bq27x00_simple_value(di->cache.power_avg, val);
674 break;
675 case POWER_SUPPLY_PROP_HEALTH:
676 ret = bq27x00_simple_value(di->cache.health, val);
677 break;
678 default:
679 return -EINVAL;
680 }
681
682 return ret;
683}
684
685static void bq27x00_external_power_changed(struct power_supply *psy)
686{
687 struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
688
689 cancel_delayed_work_sync(&di->work);
690 schedule_delayed_work(&di->work, 0);
691}
692
693static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
694{
695 int ret;
696
697 di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
698 if (di->chip == BQ27425) {
699 di->bat.properties = bq27425_battery_props;
700 di->bat.num_properties = ARRAY_SIZE(bq27425_battery_props);
701 } else {
702 di->bat.properties = bq27x00_battery_props;
703 di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
704 }
705 di->bat.get_property = bq27x00_battery_get_property;
706 di->bat.external_power_changed = bq27x00_external_power_changed;
707
708 INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
709 mutex_init(&di->lock);
710
711 ret = power_supply_register(di->dev, &di->bat);
712 if (ret) {
713 dev_err(di->dev, "failed to register battery: %d\n", ret);
714 return ret;
715 }
716
717 dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
718
719 bq27x00_update(di);
720
721 return 0;
722}
723
724static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
725{
726 /*
727 * power_supply_unregister call bq27x00_battery_get_property which
728 * call bq27x00_battery_poll.
729 * Make sure that bq27x00_battery_poll will not call
730 * schedule_delayed_work again after unregister (which cause OOPS).
731 */
732 poll_interval = 0;
733
734 cancel_delayed_work_sync(&di->work);
735
736 power_supply_unregister(&di->bat);
737
738 mutex_destroy(&di->lock);
739}
740
741
742/* i2c specific code */
743#ifdef CONFIG_BATTERY_BQ27X00_I2C
744
745/* If the system has several batteries we need a different name for each
746 * of them...
747 */
748static DEFINE_IDR(battery_id);
749static DEFINE_MUTEX(battery_mutex);
750
751static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
752{
753 struct i2c_client *client = to_i2c_client(di->dev);
754 struct i2c_msg msg[2];
755 unsigned char data[2];
756 int ret;
757
758 if (!client->adapter)
759 return -ENODEV;
760
761 msg[0].addr = client->addr;
762 msg[0].flags = 0;
763 msg[0].buf = ®
764 msg[0].len = sizeof(reg);
765 msg[1].addr = client->addr;
766 msg[1].flags = I2C_M_RD;
767 msg[1].buf = data;
768 if (single)
769 msg[1].len = 1;
770 else
771 msg[1].len = 2;
772
773 ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
774 if (ret < 0)
775 return ret;
776
777 if (!single)
778 ret = get_unaligned_le16(data);
779 else
780 ret = data[0];
781
782 return ret;
783}
784
785static int bq27x00_battery_probe(struct i2c_client *client,
786 const struct i2c_device_id *id)
787{
788 char *name;
789 struct bq27x00_device_info *di;
790 int num;
791 int retval = 0;
792
793 /* Get new ID for the new battery device */
794 mutex_lock(&battery_mutex);
795 num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
796 mutex_unlock(&battery_mutex);
797 if (num < 0)
798 return num;
799
800 name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
801 if (!name) {
802 dev_err(&client->dev, "failed to allocate device name\n");
803 retval = -ENOMEM;
804 goto batt_failed_1;
805 }
806
807 di = kzalloc(sizeof(*di), GFP_KERNEL);
808 if (!di) {
809 dev_err(&client->dev, "failed to allocate device info data\n");
810 retval = -ENOMEM;
811 goto batt_failed_2;
812 }
813
814 di->id = num;
815 di->dev = &client->dev;
816 di->chip = id->driver_data;
817 di->bat.name = name;
818 di->bus.read = &bq27x00_read_i2c;
819
820 retval = bq27x00_powersupply_init(di);
821 if (retval)
822 goto batt_failed_3;
823
824 i2c_set_clientdata(client, di);
825
826 return 0;
827
828batt_failed_3:
829 kfree(di);
830batt_failed_2:
831 kfree(name);
832batt_failed_1:
833 mutex_lock(&battery_mutex);
834 idr_remove(&battery_id, num);
835 mutex_unlock(&battery_mutex);
836
837 return retval;
838}
839
840static int bq27x00_battery_remove(struct i2c_client *client)
841{
842 struct bq27x00_device_info *di = i2c_get_clientdata(client);
843
844 bq27x00_powersupply_unregister(di);
845
846 kfree(di->bat.name);
847
848 mutex_lock(&battery_mutex);
849 idr_remove(&battery_id, di->id);
850 mutex_unlock(&battery_mutex);
851
852 kfree(di);
853
854 return 0;
855}
856
857static const struct i2c_device_id bq27x00_id[] = {
858 { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
859 { "bq27500", BQ27500 },
860 { "bq27425", BQ27425 },
861 {},
862};
863MODULE_DEVICE_TABLE(i2c, bq27x00_id);
864
865static struct i2c_driver bq27x00_battery_driver = {
866 .driver = {
867 .name = "bq27x00-battery",
868 },
869 .probe = bq27x00_battery_probe,
870 .remove = bq27x00_battery_remove,
871 .id_table = bq27x00_id,
872};
873
874static inline int bq27x00_battery_i2c_init(void)
875{
876 int ret = i2c_add_driver(&bq27x00_battery_driver);
877 if (ret)
878 printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n");
879
880 return ret;
881}
882
883static inline void bq27x00_battery_i2c_exit(void)
884{
885 i2c_del_driver(&bq27x00_battery_driver);
886}
887
888#else
889
890static inline int bq27x00_battery_i2c_init(void) { return 0; }
891static inline void bq27x00_battery_i2c_exit(void) {};
892
893#endif
894
895/* platform specific code */
896#ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
897
898static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
899 bool single)
900{
901 struct device *dev = di->dev;
902 struct bq27000_platform_data *pdata = dev->platform_data;
903 unsigned int timeout = 3;
904 int upper, lower;
905 int temp;
906
907 if (!single) {
908 /* Make sure the value has not changed in between reading the
909 * lower and the upper part */
910 upper = pdata->read(dev, reg + 1);
911 do {
912 temp = upper;
913 if (upper < 0)
914 return upper;
915
916 lower = pdata->read(dev, reg);
917 if (lower < 0)
918 return lower;
919
920 upper = pdata->read(dev, reg + 1);
921 } while (temp != upper && --timeout);
922
923 if (timeout == 0)
924 return -EIO;
925
926 return (upper << 8) | lower;
927 }
928
929 return pdata->read(dev, reg);
930}
931
932static int bq27000_battery_probe(struct platform_device *pdev)
933{
934 struct bq27x00_device_info *di;
935 struct bq27000_platform_data *pdata = pdev->dev.platform_data;
936 int ret;
937
938 if (!pdata) {
939 dev_err(&pdev->dev, "no platform_data supplied\n");
940 return -EINVAL;
941 }
942
943 if (!pdata->read) {
944 dev_err(&pdev->dev, "no hdq read callback supplied\n");
945 return -EINVAL;
946 }
947
948 di = kzalloc(sizeof(*di), GFP_KERNEL);
949 if (!di) {
950 dev_err(&pdev->dev, "failed to allocate device info data\n");
951 return -ENOMEM;
952 }
953
954 platform_set_drvdata(pdev, di);
955
956 di->dev = &pdev->dev;
957 di->chip = BQ27000;
958
959 di->bat.name = pdata->name ?: dev_name(&pdev->dev);
960 di->bus.read = &bq27000_read_platform;
961
962 ret = bq27x00_powersupply_init(di);
963 if (ret)
964 goto err_free;
965
966 return 0;
967
968err_free:
969 kfree(di);
970
971 return ret;
972}
973
974static int bq27000_battery_remove(struct platform_device *pdev)
975{
976 struct bq27x00_device_info *di = platform_get_drvdata(pdev);
977
978 bq27x00_powersupply_unregister(di);
979
980 kfree(di);
981
982 return 0;
983}
984
985static struct platform_driver bq27000_battery_driver = {
986 .probe = bq27000_battery_probe,
987 .remove = bq27000_battery_remove,
988 .driver = {
989 .name = "bq27000-battery",
990 .owner = THIS_MODULE,
991 },
992};
993
994static inline int bq27x00_battery_platform_init(void)
995{
996 int ret = platform_driver_register(&bq27000_battery_driver);
997 if (ret)
998 printk(KERN_ERR "Unable to register BQ27000 platform driver\n");
999
1000 return ret;
1001}
1002
1003static inline void bq27x00_battery_platform_exit(void)
1004{
1005 platform_driver_unregister(&bq27000_battery_driver);
1006}
1007
1008#else
1009
1010static inline int bq27x00_battery_platform_init(void) { return 0; }
1011static inline void bq27x00_battery_platform_exit(void) {};
1012
1013#endif
1014
1015/*
1016 * Module stuff
1017 */
1018
1019static int __init bq27x00_battery_init(void)
1020{
1021 int ret;
1022
1023 ret = bq27x00_battery_i2c_init();
1024 if (ret)
1025 return ret;
1026
1027 ret = bq27x00_battery_platform_init();
1028 if (ret)
1029 bq27x00_battery_i2c_exit();
1030
1031 return ret;
1032}
1033module_init(bq27x00_battery_init);
1034
1035static void __exit bq27x00_battery_exit(void)
1036{
1037 bq27x00_battery_platform_exit();
1038 bq27x00_battery_i2c_exit();
1039}
1040module_exit(bq27x00_battery_exit);
1041
1042MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1043MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
1044MODULE_LICENSE("GPL");