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bq27x00: Add MODULE_DEVICE_TABLE
[deliverable/linux.git] / drivers / power / bq27x00_battery.c
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CommitLineData
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 *
8 * Based on a previous work by Copyright (C) 2008 Texas Instruments, Inc.
9 *
10 * This package is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
16 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
17 *
18 */
19
20/*
21 * Datasheets:
22 * http://focus.ti.com/docs/prod/folders/print/bq27000.html
23 * http://focus.ti.com/docs/prod/folders/print/bq27500.html
24 */
25
26#include <linux/module.h>
27#include <linux/param.h>
28#include <linux/jiffies.h>
29#include <linux/workqueue.h>
30#include <linux/delay.h>
31#include <linux/platform_device.h>
32#include <linux/power_supply.h>
33#include <linux/idr.h>
34#include <linux/i2c.h>
35#include <linux/slab.h>
36#include <asm/unaligned.h>
37
38#include <linux/power/bq27x00_battery.h>
39
40#define DRIVER_VERSION "1.2.0"
41
42#define BQ27x00_REG_TEMP 0x06
43#define BQ27x00_REG_VOLT 0x08
44#define BQ27x00_REG_AI 0x14
45#define BQ27x00_REG_FLAGS 0x0A
46#define BQ27x00_REG_TTE 0x16
47#define BQ27x00_REG_TTF 0x18
48#define BQ27x00_REG_TTECP 0x26
49#define BQ27x00_REG_NAC 0x0C /* Nominal available capaciy */
50#define BQ27x00_REG_LMD 0x12 /* Last measured discharge */
51#define BQ27x00_REG_CYCT 0x2A /* Cycle count total */
52#define BQ27x00_REG_AE 0x22 /* Available enery */
53
54#define BQ27000_REG_RSOC 0x0B /* Relative State-of-Charge */
55#define BQ27000_REG_ILMD 0x76 /* Initial last measured discharge */
56#define BQ27000_FLAG_CHGS BIT(7)
57
58#define BQ27500_REG_SOC 0x2c
59#define BQ27500_REG_DCAP 0x3C /* Design capacity */
60#define BQ27500_FLAG_DSC BIT(0)
61#define BQ27500_FLAG_FC BIT(9)
62
63#define BQ27000_RS 20 /* Resistor sense */
64
65struct bq27x00_device_info;
66struct bq27x00_access_methods {
67 int (*read)(struct bq27x00_device_info *di, u8 reg, bool single);
68};
69
70enum bq27x00_chip { BQ27000, BQ27500 };
71
72struct bq27x00_reg_cache {
73 int temperature;
74 int time_to_empty;
75 int time_to_empty_avg;
76 int time_to_full;
77 int charge_full;
78 int charge_counter;
79 int capacity;
80 int flags;
81
82 int current_now;
83};
84
85struct bq27x00_device_info {
86 struct device *dev;
87 int id;
88 enum bq27x00_chip chip;
89
90 struct bq27x00_reg_cache cache;
91 int charge_design_full;
92
93 unsigned long last_update;
94 struct delayed_work work;
95
96 struct power_supply bat;
97
98 struct bq27x00_access_methods bus;
99
100 struct mutex lock;
101};
102
103static enum power_supply_property bq27x00_battery_props[] = {
104 POWER_SUPPLY_PROP_STATUS,
105 POWER_SUPPLY_PROP_PRESENT,
106 POWER_SUPPLY_PROP_VOLTAGE_NOW,
107 POWER_SUPPLY_PROP_CURRENT_NOW,
108 POWER_SUPPLY_PROP_CAPACITY,
109 POWER_SUPPLY_PROP_TEMP,
110 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
111 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
112 POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
113 POWER_SUPPLY_PROP_TECHNOLOGY,
114 POWER_SUPPLY_PROP_CHARGE_FULL,
115 POWER_SUPPLY_PROP_CHARGE_NOW,
116 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
117 POWER_SUPPLY_PROP_CHARGE_COUNTER,
118 POWER_SUPPLY_PROP_ENERGY_NOW,
119};
120
121static unsigned int poll_interval = 360;
122module_param(poll_interval, uint, 0644);
123MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \
124 "0 disables polling");
125
126/*
127 * Common code for BQ27x00 devices
128 */
129
130static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg,
131 bool single)
132{
133 return di->bus.read(di, reg, single);
134}
135
136/*
137 * Return the battery Relative State-of-Charge
138 * Or < 0 if something fails.
139 */
140static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di)
141{
142 int rsoc;
143
144 if (di->chip == BQ27500)
145 rsoc = bq27x00_read(di, BQ27500_REG_SOC, false);
146 else
147 rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true);
148
149 if (rsoc < 0)
150 dev_err(di->dev, "error reading relative State-of-Charge\n");
151
152 return rsoc;
153}
154
155/*
156 * Return a battery charge value in µAh
157 * Or < 0 if something fails.
158 */
159static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
160{
161 int charge;
162
163 charge = bq27x00_read(di, reg, false);
164 if (charge < 0) {
165 dev_err(di->dev, "error reading nominal available capacity\n");
166 return charge;
167 }
168
169 if (di->chip == BQ27500)
170 charge *= 1000;
171 else
172 charge = charge * 3570 / BQ27000_RS;
173
174 return charge;
175}
176
177/*
178 * Return the battery Nominal available capaciy in µAh
179 * Or < 0 if something fails.
180 */
181static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
182{
183 return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
184}
185
186/*
187 * Return the battery Last measured discharge in µAh
188 * Or < 0 if something fails.
189 */
190static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
191{
192 return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD);
193}
194
195/*
196 * Return the battery Initial last measured discharge in µAh
197 * Or < 0 if something fails.
198 */
199static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
200{
201 int ilmd;
202
203 if (di->chip == BQ27500)
204 ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
205 else
206 ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);
207
208 if (ilmd < 0) {
209 dev_err(di->dev, "error reading initial last measured discharge\n");
210 return ilmd;
211 }
212
213 if (di->chip == BQ27500)
214 ilmd *= 1000;
215 else
216 ilmd = ilmd * 256 * 3570 / BQ27000_RS;
217
218 return ilmd;
219}
220
221/*
222 * Return the battery Cycle count total
223 * Or < 0 if something fails.
224 */
225static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
226{
227 int cyct;
228
229 cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
230 if (cyct < 0)
231 dev_err(di->dev, "error reading cycle count total\n");
232
233 return cyct;
234}
235
236/*
237 * Read a time register.
238 * Return < 0 if something fails.
239 */
240static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
241{
242 int tval;
243
244 tval = bq27x00_read(di, reg, false);
245 if (tval < 0) {
246 dev_err(di->dev, "error reading register %02x: %d\n", reg, tval);
247 return tval;
248 }
249
250 if (tval == 65535)
251 return -ENODATA;
252
253 return tval * 60;
254}
255
256static void bq27x00_update(struct bq27x00_device_info *di)
257{
258 struct bq27x00_reg_cache cache = {0, };
259 bool is_bq27500 = di->chip == BQ27500;
260
261 cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, is_bq27500);
262 if (cache.flags >= 0) {
263 cache.capacity = bq27x00_battery_read_rsoc(di);
264 cache.temperature = bq27x00_read(di, BQ27x00_REG_TEMP, false);
265 cache.time_to_empty = bq27x00_battery_read_time(di, BQ27x00_REG_TTE);
266 cache.time_to_empty_avg = bq27x00_battery_read_time(di, BQ27x00_REG_TTECP);
267 cache.time_to_full = bq27x00_battery_read_time(di, BQ27x00_REG_TTF);
268 cache.charge_full = bq27x00_battery_read_lmd(di);
269 cache.charge_counter = bq27x00_battery_read_cyct(di);
270
271 if (!is_bq27500)
272 cache.current_now = bq27x00_read(di, BQ27x00_REG_AI, false);
273
274 /* We only have to read charge design full once */
275 if (di->charge_design_full <= 0)
276 di->charge_design_full = bq27x00_battery_read_ilmd(di);
277 }
278
279 /* Ignore current_now which is a snapshot of the current battery state
280 * and is likely to be different even between two consecutive reads */
281 if (memcmp(&di->cache, &cache, sizeof(cache) - sizeof(int)) != 0) {
282 di->cache = cache;
283 power_supply_changed(&di->bat);
284 }
285
286 di->last_update = jiffies;
287}
288
289static void bq27x00_battery_poll(struct work_struct *work)
290{
291 struct bq27x00_device_info *di =
292 container_of(work, struct bq27x00_device_info, work.work);
293
294 bq27x00_update(di);
295
296 if (poll_interval > 0) {
297 /* The timer does not have to be accurate. */
298 set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
299 schedule_delayed_work(&di->work, poll_interval * HZ);
300 }
301}
302
303
304/*
305 * Return the battery temperature in tenths of degree Celsius
306 * Or < 0 if something fails.
307 */
308static int bq27x00_battery_temperature(struct bq27x00_device_info *di,
309 union power_supply_propval *val)
310{
311 if (di->cache.temperature < 0)
312 return di->cache.temperature;
313
314 if (di->chip == BQ27500)
315 val->intval = di->cache.temperature - 2731;
316 else
317 val->intval = ((di->cache.temperature * 5) - 5463) / 2;
318
319 return 0;
320}
321
322/*
323 * Return the battery average current
324 * Note that current can be negative signed as well
325 * Or 0 if something fails.
326 */
327static int bq27x00_battery_current(struct bq27x00_device_info *di,
328 union power_supply_propval *val)
329{
330 int curr;
331
332 if (di->chip == BQ27500)
333 curr = bq27x00_read(di, BQ27x00_REG_AI, false);
334 else
335 curr = di->cache.current_now;
336
337 if (curr < 0)
338 return curr;
339
340 if (di->chip == BQ27500) {
341 /* bq27500 returns signed value */
342 val->intval = (int)((s16)curr) * 1000;
343 } else {
344 if (di->cache.flags & BQ27000_FLAG_CHGS) {
345 dev_dbg(di->dev, "negative current!\n");
346 curr = -curr;
347 }
348
349 val->intval = curr * 3570 / BQ27000_RS;
350 }
351
352 return 0;
353}
354
355static int bq27x00_battery_status(struct bq27x00_device_info *di,
356 union power_supply_propval *val)
357{
358 int status;
359
360 if (di->chip == BQ27500) {
361 if (di->cache.flags & BQ27500_FLAG_FC)
362 status = POWER_SUPPLY_STATUS_FULL;
363 else if (di->cache.flags & BQ27500_FLAG_DSC)
364 status = POWER_SUPPLY_STATUS_DISCHARGING;
365 else
366 status = POWER_SUPPLY_STATUS_CHARGING;
367 } else {
368 if (di->cache.flags & BQ27000_FLAG_CHGS)
369 status = POWER_SUPPLY_STATUS_CHARGING;
370 else
371 status = POWER_SUPPLY_STATUS_DISCHARGING;
372 }
373
374 val->intval = status;
375
376 return 0;
377}
378
379/*
380 * Return the battery Voltage in milivolts
381 * Or < 0 if something fails.
382 */
383static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
384 union power_supply_propval *val)
385{
386 int volt;
387
388 volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
389 if (volt < 0)
390 return volt;
391
392 val->intval = volt * 1000;
393
394 return 0;
395}
396
397/*
398 * Return the battery Available energy in µWh
399 * Or < 0 if something fails.
400 */
401static int bq27x00_battery_energy(struct bq27x00_device_info *di,
402 union power_supply_propval *val)
403{
404 int ae;
405
406 ae = bq27x00_read(di, BQ27x00_REG_AE, false);
407 if (ae < 0) {
408 dev_err(di->dev, "error reading available energy\n");
409 return ae;
410 }
411
412 if (di->chip == BQ27500)
413 ae *= 1000;
414 else
415 ae = ae * 29200 / BQ27000_RS;
416
417 val->intval = ae;
418
419 return 0;
420}
421
422
423static int bq27x00_simple_value(int value,
424 union power_supply_propval *val)
425{
426 if (value < 0)
427 return value;
428
429 val->intval = value;
430
431 return 0;
432}
433
434#define to_bq27x00_device_info(x) container_of((x), \
435 struct bq27x00_device_info, bat);
436
437static int bq27x00_battery_get_property(struct power_supply *psy,
438 enum power_supply_property psp,
439 union power_supply_propval *val)
440{
441 int ret = 0;
442 struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
443
444 mutex_lock(&di->lock);
445 if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
446 cancel_delayed_work_sync(&di->work);
447 bq27x00_battery_poll(&di->work.work);
448 }
449 mutex_unlock(&di->lock);
450
451 if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
452 return -ENODEV;
453
454 switch (psp) {
455 case POWER_SUPPLY_PROP_STATUS:
456 ret = bq27x00_battery_status(di, val);
457 break;
458 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
459 ret = bq27x00_battery_voltage(di, val);
460 break;
461 case POWER_SUPPLY_PROP_PRESENT:
462 val->intval = di->cache.flags < 0 ? 0 : 1;
463 break;
464 case POWER_SUPPLY_PROP_CURRENT_NOW:
465 ret = bq27x00_battery_current(di, val);
466 break;
467 case POWER_SUPPLY_PROP_CAPACITY:
468 ret = bq27x00_simple_value(di->cache.capacity, val);
469 break;
470 case POWER_SUPPLY_PROP_TEMP:
471 ret = bq27x00_battery_temperature(di, val);
472 break;
473 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
474 ret = bq27x00_simple_value(di->cache.time_to_empty, val);
475 break;
476 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
477 ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val);
478 break;
479 case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
480 ret = bq27x00_simple_value(di->cache.time_to_full, val);
481 break;
482 case POWER_SUPPLY_PROP_TECHNOLOGY:
483 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
484 break;
485 case POWER_SUPPLY_PROP_CHARGE_NOW:
486 ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
487 break;
488 case POWER_SUPPLY_PROP_CHARGE_FULL:
489 ret = bq27x00_simple_value(di->cache.charge_full, val);
490 break;
491 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
492 ret = bq27x00_simple_value(di->charge_design_full, val);
493 break;
494 case POWER_SUPPLY_PROP_CHARGE_COUNTER:
495 ret = bq27x00_simple_value(di->cache.charge_counter, val);
496 break;
497 case POWER_SUPPLY_PROP_ENERGY_NOW:
498 ret = bq27x00_battery_energy(di, val);
499 break;
500 default:
501 return -EINVAL;
502 }
503
504 return ret;
505}
506
507static void bq27x00_external_power_changed(struct power_supply *psy)
508{
509 struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
510
511 cancel_delayed_work_sync(&di->work);
512 schedule_delayed_work(&di->work, 0);
513}
514
515static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
516{
517 int ret;
518
519 di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
520 di->bat.properties = bq27x00_battery_props;
521 di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
522 di->bat.get_property = bq27x00_battery_get_property;
523 di->bat.external_power_changed = bq27x00_external_power_changed;
524
525 INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
526 mutex_init(&di->lock);
527
528 ret = power_supply_register(di->dev, &di->bat);
529 if (ret) {
530 dev_err(di->dev, "failed to register battery: %d\n", ret);
531 return ret;
532 }
533
534 dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
535
536 bq27x00_update(di);
537
538 return 0;
539}
540
541static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
542{
543 cancel_delayed_work_sync(&di->work);
544
545 power_supply_unregister(&di->bat);
546
547 mutex_destroy(&di->lock);
548}
549
550
551/* i2c specific code */
552#ifdef CONFIG_BATTERY_BQ27X00_I2C
553
554/* If the system has several batteries we need a different name for each
555 * of them...
556 */
557static DEFINE_IDR(battery_id);
558static DEFINE_MUTEX(battery_mutex);
559
560static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
561{
562 struct i2c_client *client = to_i2c_client(di->dev);
563 struct i2c_msg msg[1];
564 unsigned char data[2];
565 int ret;
566
567 if (!client->adapter)
568 return -ENODEV;
569
570 msg->addr = client->addr;
571 msg->flags = 0;
572 msg->len = 1;
573 msg->buf = data;
574
575 data[0] = reg;
576 ret = i2c_transfer(client->adapter, msg, 1);
577
578 if (ret >= 0) {
579 if (!single)
580 msg->len = 2;
581 else
582 msg->len = 1;
583
584 msg->flags = I2C_M_RD;
585 ret = i2c_transfer(client->adapter, msg, 1);
586 if (ret >= 0) {
587 if (!single)
588 ret = get_unaligned_le16(data);
589 else
590 ret = data[0];
591 }
592 }
593 return ret;
594}
595
596static int bq27x00_battery_probe(struct i2c_client *client,
597 const struct i2c_device_id *id)
598{
599 char *name;
600 struct bq27x00_device_info *di;
601 int num;
602 int retval = 0;
603
604 /* Get new ID for the new battery device */
605 retval = idr_pre_get(&battery_id, GFP_KERNEL);
606 if (retval == 0)
607 return -ENOMEM;
608 mutex_lock(&battery_mutex);
609 retval = idr_get_new(&battery_id, client, &num);
610 mutex_unlock(&battery_mutex);
611 if (retval < 0)
612 return retval;
613
614 name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
615 if (!name) {
616 dev_err(&client->dev, "failed to allocate device name\n");
617 retval = -ENOMEM;
618 goto batt_failed_1;
619 }
620
621 di = kzalloc(sizeof(*di), GFP_KERNEL);
622 if (!di) {
623 dev_err(&client->dev, "failed to allocate device info data\n");
624 retval = -ENOMEM;
625 goto batt_failed_2;
626 }
627
628 di->id = num;
629 di->dev = &client->dev;
630 di->chip = id->driver_data;
631 di->bat.name = name;
632 di->bus.read = &bq27x00_read_i2c;
633
634 if (bq27x00_powersupply_init(di))
635 goto batt_failed_3;
636
637 i2c_set_clientdata(client, di);
638
639 return 0;
640
641batt_failed_3:
642 kfree(di);
643batt_failed_2:
644 kfree(name);
645batt_failed_1:
646 mutex_lock(&battery_mutex);
647 idr_remove(&battery_id, num);
648 mutex_unlock(&battery_mutex);
649
650 return retval;
651}
652
653static int bq27x00_battery_remove(struct i2c_client *client)
654{
655 struct bq27x00_device_info *di = i2c_get_clientdata(client);
656
657 bq27x00_powersupply_unregister(di);
658
659 kfree(di->bat.name);
660
661 mutex_lock(&battery_mutex);
662 idr_remove(&battery_id, di->id);
663 mutex_unlock(&battery_mutex);
664
665 kfree(di);
666
667 return 0;
668}
669
670static const struct i2c_device_id bq27x00_id[] = {
671 { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
672 { "bq27500", BQ27500 },
673 {},
674};
675MODULE_DEVICE_TABLE(i2c, bq27x00_id);
676
677static struct i2c_driver bq27x00_battery_driver = {
678 .driver = {
679 .name = "bq27x00-battery",
680 },
681 .probe = bq27x00_battery_probe,
682 .remove = bq27x00_battery_remove,
683 .id_table = bq27x00_id,
684};
685
686static inline int bq27x00_battery_i2c_init(void)
687{
688 int ret = i2c_add_driver(&bq27x00_battery_driver);
689 if (ret)
690 printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n");
691
692 return ret;
693}
694
695static inline void bq27x00_battery_i2c_exit(void)
696{
697 i2c_del_driver(&bq27x00_battery_driver);
698}
699
700#else
701
702static inline int bq27x00_battery_i2c_init(void) { return 0; }
703static inline void bq27x00_battery_i2c_exit(void) {};
704
705#endif
706
707/* platform specific code */
708#ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
709
710static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
711 bool single)
712{
713 struct device *dev = di->dev;
714 struct bq27000_platform_data *pdata = dev->platform_data;
715 unsigned int timeout = 3;
716 int upper, lower;
717 int temp;
718
719 if (!single) {
720 /* Make sure the value has not changed in between reading the
721 * lower and the upper part */
722 upper = pdata->read(dev, reg + 1);
723 do {
724 temp = upper;
725 if (upper < 0)
726 return upper;
727
728 lower = pdata->read(dev, reg);
729 if (lower < 0)
730 return lower;
731
732 upper = pdata->read(dev, reg + 1);
733 } while (temp != upper && --timeout);
734
735 if (timeout == 0)
736 return -EIO;
737
738 return (upper << 8) | lower;
739 }
740
741 return pdata->read(dev, reg);
742}
743
744static int __devinit bq27000_battery_probe(struct platform_device *pdev)
745{
746 struct bq27x00_device_info *di;
747 struct bq27000_platform_data *pdata = pdev->dev.platform_data;
748 int ret;
749
750 if (!pdata) {
751 dev_err(&pdev->dev, "no platform_data supplied\n");
752 return -EINVAL;
753 }
754
755 if (!pdata->read) {
756 dev_err(&pdev->dev, "no hdq read callback supplied\n");
757 return -EINVAL;
758 }
759
760 di = kzalloc(sizeof(*di), GFP_KERNEL);
761 if (!di) {
762 dev_err(&pdev->dev, "failed to allocate device info data\n");
763 return -ENOMEM;
764 }
765
766 platform_set_drvdata(pdev, di);
767
768 di->dev = &pdev->dev;
769 di->chip = BQ27000;
770
771 di->bat.name = pdata->name ?: dev_name(&pdev->dev);
772 di->bus.read = &bq27000_read_platform;
773
774 ret = bq27x00_powersupply_init(di);
775 if (ret)
776 goto err_free;
777
778 return 0;
779
780err_free:
781 platform_set_drvdata(pdev, NULL);
782 kfree(di);
783
784 return ret;
785}
786
787static int __devexit bq27000_battery_remove(struct platform_device *pdev)
788{
789 struct bq27x00_device_info *di = platform_get_drvdata(pdev);
790
791 bq27x00_powersupply_unregister(di);
792
793 platform_set_drvdata(pdev, NULL);
794 kfree(di);
795
796 return 0;
797}
798
799static struct platform_driver bq27000_battery_driver = {
800 .probe = bq27000_battery_probe,
801 .remove = __devexit_p(bq27000_battery_remove),
802 .driver = {
803 .name = "bq27000-battery",
804 .owner = THIS_MODULE,
805 },
806};
807
808static inline int bq27x00_battery_platform_init(void)
809{
810 int ret = platform_driver_register(&bq27000_battery_driver);
811 if (ret)
812 printk(KERN_ERR "Unable to register BQ27000 platform driver\n");
813
814 return ret;
815}
816
817static inline void bq27x00_battery_platform_exit(void)
818{
819 platform_driver_unregister(&bq27000_battery_driver);
820}
821
822#else
823
824static inline int bq27x00_battery_platform_init(void) { return 0; }
825static inline void bq27x00_battery_platform_exit(void) {};
826
827#endif
828
829/*
830 * Module stuff
831 */
832
833static int __init bq27x00_battery_init(void)
834{
835 int ret;
836
837 ret = bq27x00_battery_i2c_init();
838 if (ret)
839 return ret;
840
841 ret = bq27x00_battery_platform_init();
842 if (ret)
843 bq27x00_battery_i2c_exit();
844
845 return ret;
846}
847module_init(bq27x00_battery_init);
848
849static void __exit bq27x00_battery_exit(void)
850{
851 bq27x00_battery_platform_exit();
852 bq27x00_battery_i2c_exit();
853}
854module_exit(bq27x00_battery_exit);
855
856MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
857MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
858MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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