/drivers/power/bq20z75.c
C | 709 lines | 558 code | 106 blank | 45 comment | 88 complexity | b4b6c7ca55e9f6ac95191191d8b85344 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
1/*
2 * Gas Gauge driver for TI's BQ20Z75
3 *
4 * Copyright (c) 2010, NVIDIA Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
19 */
20
21#include <linux/init.h>
22#include <linux/module.h>
23#include <linux/kernel.h>
24#include <linux/err.h>
25#include <linux/power_supply.h>
26#include <linux/i2c.h>
27#include <linux/slab.h>
28#include <linux/interrupt.h>
29#include <linux/gpio.h>
30
31#include <linux/power/bq20z75.h>
32
33enum {
34 REG_MANUFACTURER_DATA,
35 REG_TEMPERATURE,
36 REG_VOLTAGE,
37 REG_CURRENT,
38 REG_CAPACITY,
39 REG_TIME_TO_EMPTY,
40 REG_TIME_TO_FULL,
41 REG_STATUS,
42 REG_CYCLE_COUNT,
43 REG_SERIAL_NUMBER,
44 REG_REMAINING_CAPACITY,
45 REG_REMAINING_CAPACITY_CHARGE,
46 REG_FULL_CHARGE_CAPACITY,
47 REG_FULL_CHARGE_CAPACITY_CHARGE,
48 REG_DESIGN_CAPACITY,
49 REG_DESIGN_CAPACITY_CHARGE,
50 REG_DESIGN_VOLTAGE,
51};
52
53/* Battery Mode defines */
54#define BATTERY_MODE_OFFSET 0x03
55#define BATTERY_MODE_MASK 0x8000
56enum bq20z75_battery_mode {
57 BATTERY_MODE_AMPS,
58 BATTERY_MODE_WATTS
59};
60
61/* manufacturer access defines */
62#define MANUFACTURER_ACCESS_STATUS 0x0006
63#define MANUFACTURER_ACCESS_SLEEP 0x0011
64
65/* battery status value bits */
66#define BATTERY_DISCHARGING 0x40
67#define BATTERY_FULL_CHARGED 0x20
68#define BATTERY_FULL_DISCHARGED 0x10
69
70#define BQ20Z75_DATA(_psp, _addr, _min_value, _max_value) { \
71 .psp = _psp, \
72 .addr = _addr, \
73 .min_value = _min_value, \
74 .max_value = _max_value, \
75}
76
77static const struct bq20z75_device_data {
78 enum power_supply_property psp;
79 u8 addr;
80 int min_value;
81 int max_value;
82} bq20z75_data[] = {
83 [REG_MANUFACTURER_DATA] =
84 BQ20Z75_DATA(POWER_SUPPLY_PROP_PRESENT, 0x00, 0, 65535),
85 [REG_TEMPERATURE] =
86 BQ20Z75_DATA(POWER_SUPPLY_PROP_TEMP, 0x08, 0, 65535),
87 [REG_VOLTAGE] =
88 BQ20Z75_DATA(POWER_SUPPLY_PROP_VOLTAGE_NOW, 0x09, 0, 20000),
89 [REG_CURRENT] =
90 BQ20Z75_DATA(POWER_SUPPLY_PROP_CURRENT_NOW, 0x0A, -32768,
91 32767),
92 [REG_CAPACITY] =
93 BQ20Z75_DATA(POWER_SUPPLY_PROP_CAPACITY, 0x0E, 0, 100),
94 [REG_REMAINING_CAPACITY] =
95 BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_NOW, 0x0F, 0, 65535),
96 [REG_REMAINING_CAPACITY_CHARGE] =
97 BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_NOW, 0x0F, 0, 65535),
98 [REG_FULL_CHARGE_CAPACITY] =
99 BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_FULL, 0x10, 0, 65535),
100 [REG_FULL_CHARGE_CAPACITY_CHARGE] =
101 BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_FULL, 0x10, 0, 65535),
102 [REG_TIME_TO_EMPTY] =
103 BQ20Z75_DATA(POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, 0x12, 0,
104 65535),
105 [REG_TIME_TO_FULL] =
106 BQ20Z75_DATA(POWER_SUPPLY_PROP_TIME_TO_FULL_AVG, 0x13, 0,
107 65535),
108 [REG_STATUS] =
109 BQ20Z75_DATA(POWER_SUPPLY_PROP_STATUS, 0x16, 0, 65535),
110 [REG_CYCLE_COUNT] =
111 BQ20Z75_DATA(POWER_SUPPLY_PROP_CYCLE_COUNT, 0x17, 0, 65535),
112 [REG_DESIGN_CAPACITY] =
113 BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 0x18, 0,
114 65535),
115 [REG_DESIGN_CAPACITY_CHARGE] =
116 BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 0x18, 0,
117 65535),
118 [REG_DESIGN_VOLTAGE] =
119 BQ20Z75_DATA(POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 0x19, 0,
120 65535),
121 [REG_SERIAL_NUMBER] =
122 BQ20Z75_DATA(POWER_SUPPLY_PROP_SERIAL_NUMBER, 0x1C, 0, 65535),
123};
124
125static enum power_supply_property bq20z75_properties[] = {
126 POWER_SUPPLY_PROP_STATUS,
127 POWER_SUPPLY_PROP_HEALTH,
128 POWER_SUPPLY_PROP_PRESENT,
129 POWER_SUPPLY_PROP_TECHNOLOGY,
130 POWER_SUPPLY_PROP_CYCLE_COUNT,
131 POWER_SUPPLY_PROP_VOLTAGE_NOW,
132 POWER_SUPPLY_PROP_CURRENT_NOW,
133 POWER_SUPPLY_PROP_CAPACITY,
134 POWER_SUPPLY_PROP_TEMP,
135 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
136 POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
137 POWER_SUPPLY_PROP_SERIAL_NUMBER,
138 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
139 POWER_SUPPLY_PROP_ENERGY_NOW,
140 POWER_SUPPLY_PROP_ENERGY_FULL,
141 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
142 POWER_SUPPLY_PROP_CHARGE_NOW,
143 POWER_SUPPLY_PROP_CHARGE_FULL,
144 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
145};
146
147struct bq20z75_info {
148 struct i2c_client *client;
149 struct power_supply power_supply;
150 struct bq20z75_platform_data *pdata;
151 bool is_present;
152 bool gpio_detect;
153 bool enable_detection;
154 int irq;
155};
156
157static int bq20z75_read_word_data(struct i2c_client *client, u8 address)
158{
159 struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
160 s32 ret = 0;
161 int retries = 1;
162
163 if (bq20z75_device->pdata)
164 retries = max(bq20z75_device->pdata->i2c_retry_count + 1, 1);
165
166 while (retries > 0) {
167 ret = i2c_smbus_read_word_data(client, address);
168 if (ret >= 0)
169 break;
170 retries--;
171 }
172
173 if (ret < 0) {
174 dev_dbg(&client->dev,
175 "%s: i2c read at address 0x%x failed\n",
176 __func__, address);
177 return ret;
178 }
179
180 return le16_to_cpu(ret);
181}
182
183static int bq20z75_write_word_data(struct i2c_client *client, u8 address,
184 u16 value)
185{
186 struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
187 s32 ret = 0;
188 int retries = 1;
189
190 if (bq20z75_device->pdata)
191 retries = max(bq20z75_device->pdata->i2c_retry_count + 1, 1);
192
193 while (retries > 0) {
194 ret = i2c_smbus_write_word_data(client, address,
195 le16_to_cpu(value));
196 if (ret >= 0)
197 break;
198 retries--;
199 }
200
201 if (ret < 0) {
202 dev_dbg(&client->dev,
203 "%s: i2c write to address 0x%x failed\n",
204 __func__, address);
205 return ret;
206 }
207
208 return 0;
209}
210
211static int bq20z75_get_battery_presence_and_health(
212 struct i2c_client *client, enum power_supply_property psp,
213 union power_supply_propval *val)
214{
215 s32 ret;
216 struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
217
218 if (psp == POWER_SUPPLY_PROP_PRESENT &&
219 bq20z75_device->gpio_detect) {
220 ret = gpio_get_value(
221 bq20z75_device->pdata->battery_detect);
222 if (ret == bq20z75_device->pdata->battery_detect_present)
223 val->intval = 1;
224 else
225 val->intval = 0;
226 bq20z75_device->is_present = val->intval;
227 return ret;
228 }
229
230 /* Write to ManufacturerAccess with
231 * ManufacturerAccess command and then
232 * read the status */
233 ret = bq20z75_write_word_data(client,
234 bq20z75_data[REG_MANUFACTURER_DATA].addr,
235 MANUFACTURER_ACCESS_STATUS);
236 if (ret < 0) {
237 if (psp == POWER_SUPPLY_PROP_PRESENT)
238 val->intval = 0; /* battery removed */
239 return ret;
240 }
241
242 ret = bq20z75_read_word_data(client,
243 bq20z75_data[REG_MANUFACTURER_DATA].addr);
244 if (ret < 0)
245 return ret;
246
247 if (ret < bq20z75_data[REG_MANUFACTURER_DATA].min_value ||
248 ret > bq20z75_data[REG_MANUFACTURER_DATA].max_value) {
249 val->intval = 0;
250 return 0;
251 }
252
253 /* Mask the upper nibble of 2nd byte and
254 * lower byte of response then
255 * shift the result by 8 to get status*/
256 ret &= 0x0F00;
257 ret >>= 8;
258 if (psp == POWER_SUPPLY_PROP_PRESENT) {
259 if (ret == 0x0F)
260 /* battery removed */
261 val->intval = 0;
262 else
263 val->intval = 1;
264 } else if (psp == POWER_SUPPLY_PROP_HEALTH) {
265 if (ret == 0x09)
266 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
267 else if (ret == 0x0B)
268 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
269 else if (ret == 0x0C)
270 val->intval = POWER_SUPPLY_HEALTH_DEAD;
271 else
272 val->intval = POWER_SUPPLY_HEALTH_GOOD;
273 }
274
275 return 0;
276}
277
278static int bq20z75_get_battery_property(struct i2c_client *client,
279 int reg_offset, enum power_supply_property psp,
280 union power_supply_propval *val)
281{
282 s32 ret;
283
284 ret = bq20z75_read_word_data(client,
285 bq20z75_data[reg_offset].addr);
286 if (ret < 0)
287 return ret;
288
289 /* returned values are 16 bit */
290 if (bq20z75_data[reg_offset].min_value < 0)
291 ret = (s16)ret;
292
293 if (ret >= bq20z75_data[reg_offset].min_value &&
294 ret <= bq20z75_data[reg_offset].max_value) {
295 val->intval = ret;
296 if (psp == POWER_SUPPLY_PROP_STATUS) {
297 if (ret & BATTERY_FULL_CHARGED)
298 val->intval = POWER_SUPPLY_STATUS_FULL;
299 else if (ret & BATTERY_FULL_DISCHARGED)
300 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
301 else if (ret & BATTERY_DISCHARGING)
302 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
303 else
304 val->intval = POWER_SUPPLY_STATUS_CHARGING;
305 }
306 } else {
307 if (psp == POWER_SUPPLY_PROP_STATUS)
308 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
309 else
310 val->intval = 0;
311 }
312
313 return 0;
314}
315
316static void bq20z75_unit_adjustment(struct i2c_client *client,
317 enum power_supply_property psp, union power_supply_propval *val)
318{
319#define BASE_UNIT_CONVERSION 1000
320#define BATTERY_MODE_CAP_MULT_WATT (10 * BASE_UNIT_CONVERSION)
321#define TIME_UNIT_CONVERSION 60
322#define TEMP_KELVIN_TO_CELSIUS 2731
323 switch (psp) {
324 case POWER_SUPPLY_PROP_ENERGY_NOW:
325 case POWER_SUPPLY_PROP_ENERGY_FULL:
326 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
327 /* bq20z75 provides energy in units of 10mWh.
328 * Convert to µWh
329 */
330 val->intval *= BATTERY_MODE_CAP_MULT_WATT;
331 break;
332
333 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
334 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
335 case POWER_SUPPLY_PROP_CURRENT_NOW:
336 case POWER_SUPPLY_PROP_CHARGE_NOW:
337 case POWER_SUPPLY_PROP_CHARGE_FULL:
338 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
339 val->intval *= BASE_UNIT_CONVERSION;
340 break;
341
342 case POWER_SUPPLY_PROP_TEMP:
343 /* bq20z75 provides battery temperature in 0.1K
344 * so convert it to 0.1°C
345 */
346 val->intval -= TEMP_KELVIN_TO_CELSIUS;
347 break;
348
349 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
350 case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
351 /* bq20z75 provides time to empty and time to full in minutes.
352 * Convert to seconds
353 */
354 val->intval *= TIME_UNIT_CONVERSION;
355 break;
356
357 default:
358 dev_dbg(&client->dev,
359 "%s: no need for unit conversion %d\n", __func__, psp);
360 }
361}
362
363static enum bq20z75_battery_mode
364bq20z75_set_battery_mode(struct i2c_client *client,
365 enum bq20z75_battery_mode mode)
366{
367 int ret, original_val;
368
369 original_val = bq20z75_read_word_data(client, BATTERY_MODE_OFFSET);
370 if (original_val < 0)
371 return original_val;
372
373 if ((original_val & BATTERY_MODE_MASK) == mode)
374 return mode;
375
376 if (mode == BATTERY_MODE_AMPS)
377 ret = original_val & ~BATTERY_MODE_MASK;
378 else
379 ret = original_val | BATTERY_MODE_MASK;
380
381 ret = bq20z75_write_word_data(client, BATTERY_MODE_OFFSET, ret);
382 if (ret < 0)
383 return ret;
384
385 return original_val & BATTERY_MODE_MASK;
386}
387
388static int bq20z75_get_battery_capacity(struct i2c_client *client,
389 int reg_offset, enum power_supply_property psp,
390 union power_supply_propval *val)
391{
392 s32 ret;
393 enum bq20z75_battery_mode mode = BATTERY_MODE_WATTS;
394
395 if (power_supply_is_amp_property(psp))
396 mode = BATTERY_MODE_AMPS;
397
398 mode = bq20z75_set_battery_mode(client, mode);
399 if (mode < 0)
400 return mode;
401
402 ret = bq20z75_read_word_data(client, bq20z75_data[reg_offset].addr);
403 if (ret < 0)
404 return ret;
405
406 if (psp == POWER_SUPPLY_PROP_CAPACITY) {
407 /* bq20z75 spec says that this can be >100 %
408 * even if max value is 100 % */
409 val->intval = min(ret, 100);
410 } else
411 val->intval = ret;
412
413 ret = bq20z75_set_battery_mode(client, mode);
414 if (ret < 0)
415 return ret;
416
417 return 0;
418}
419
420static char bq20z75_serial[5];
421static int bq20z75_get_battery_serial_number(struct i2c_client *client,
422 union power_supply_propval *val)
423{
424 int ret;
425
426 ret = bq20z75_read_word_data(client,
427 bq20z75_data[REG_SERIAL_NUMBER].addr);
428 if (ret < 0)
429 return ret;
430
431 ret = sprintf(bq20z75_serial, "%04x", ret);
432 val->strval = bq20z75_serial;
433
434 return 0;
435}
436
437static int bq20z75_get_property_index(struct i2c_client *client,
438 enum power_supply_property psp)
439{
440 int count;
441 for (count = 0; count < ARRAY_SIZE(bq20z75_data); count++)
442 if (psp == bq20z75_data[count].psp)
443 return count;
444
445 dev_warn(&client->dev,
446 "%s: Invalid Property - %d\n", __func__, psp);
447
448 return -EINVAL;
449}
450
451static int bq20z75_get_property(struct power_supply *psy,
452 enum power_supply_property psp,
453 union power_supply_propval *val)
454{
455 int ret = 0;
456 struct bq20z75_info *bq20z75_device = container_of(psy,
457 struct bq20z75_info, power_supply);
458 struct i2c_client *client = bq20z75_device->client;
459
460 switch (psp) {
461 case POWER_SUPPLY_PROP_PRESENT:
462 case POWER_SUPPLY_PROP_HEALTH:
463 ret = bq20z75_get_battery_presence_and_health(client, psp, val);
464 if (psp == POWER_SUPPLY_PROP_PRESENT)
465 return 0;
466 break;
467
468 case POWER_SUPPLY_PROP_TECHNOLOGY:
469 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
470 break;
471
472 case POWER_SUPPLY_PROP_ENERGY_NOW:
473 case POWER_SUPPLY_PROP_ENERGY_FULL:
474 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
475 case POWER_SUPPLY_PROP_CHARGE_NOW:
476 case POWER_SUPPLY_PROP_CHARGE_FULL:
477 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
478 case POWER_SUPPLY_PROP_CAPACITY:
479 ret = bq20z75_get_property_index(client, psp);
480 if (ret < 0)
481 break;
482
483 ret = bq20z75_get_battery_capacity(client, ret, psp, val);
484 break;
485
486 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
487 ret = bq20z75_get_battery_serial_number(client, val);
488 break;
489
490 case POWER_SUPPLY_PROP_STATUS:
491 case POWER_SUPPLY_PROP_CYCLE_COUNT:
492 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
493 case POWER_SUPPLY_PROP_CURRENT_NOW:
494 case POWER_SUPPLY_PROP_TEMP:
495 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
496 case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
497 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
498 ret = bq20z75_get_property_index(client, psp);
499 if (ret < 0)
500 break;
501
502 ret = bq20z75_get_battery_property(client, ret, psp, val);
503 break;
504
505 default:
506 dev_err(&client->dev,
507 "%s: INVALID property\n", __func__);
508 return -EINVAL;
509 }
510
511 if (!bq20z75_device->enable_detection)
512 goto done;
513
514 if (!bq20z75_device->gpio_detect &&
515 bq20z75_device->is_present != (ret >= 0)) {
516 bq20z75_device->is_present = (ret >= 0);
517 power_supply_changed(&bq20z75_device->power_supply);
518 }
519
520done:
521 if (!ret) {
522 /* Convert units to match requirements for power supply class */
523 bq20z75_unit_adjustment(client, psp, val);
524 }
525
526 dev_dbg(&client->dev,
527 "%s: property = %d, value = %x\n", __func__, psp, val->intval);
528
529 if (ret && bq20z75_device->is_present)
530 return ret;
531
532 /* battery not present, so return NODATA for properties */
533 if (ret)
534 return -ENODATA;
535
536 return 0;
537}
538
539static irqreturn_t bq20z75_irq(int irq, void *devid)
540{
541 struct power_supply *battery = devid;
542
543 power_supply_changed(battery);
544
545 return IRQ_HANDLED;
546}
547
548static int __devinit bq20z75_probe(struct i2c_client *client,
549 const struct i2c_device_id *id)
550{
551 struct bq20z75_info *bq20z75_device;
552 struct bq20z75_platform_data *pdata = client->dev.platform_data;
553 int rc;
554 int irq;
555
556 bq20z75_device = kzalloc(sizeof(struct bq20z75_info), GFP_KERNEL);
557 if (!bq20z75_device)
558 return -ENOMEM;
559
560 bq20z75_device->client = client;
561 bq20z75_device->enable_detection = false;
562 bq20z75_device->gpio_detect = false;
563 bq20z75_device->power_supply.name = "battery";
564 bq20z75_device->power_supply.type = POWER_SUPPLY_TYPE_BATTERY;
565 bq20z75_device->power_supply.properties = bq20z75_properties;
566 bq20z75_device->power_supply.num_properties =
567 ARRAY_SIZE(bq20z75_properties);
568 bq20z75_device->power_supply.get_property = bq20z75_get_property;
569
570 if (pdata) {
571 bq20z75_device->gpio_detect =
572 gpio_is_valid(pdata->battery_detect);
573 bq20z75_device->pdata = pdata;
574 }
575
576 i2c_set_clientdata(client, bq20z75_device);
577
578 if (!bq20z75_device->gpio_detect)
579 goto skip_gpio;
580
581 rc = gpio_request(pdata->battery_detect, dev_name(&client->dev));
582 if (rc) {
583 dev_warn(&client->dev, "Failed to request gpio: %d\n", rc);
584 bq20z75_device->gpio_detect = false;
585 goto skip_gpio;
586 }
587
588 rc = gpio_direction_input(pdata->battery_detect);
589 if (rc) {
590 dev_warn(&client->dev, "Failed to get gpio as input: %d\n", rc);
591 gpio_free(pdata->battery_detect);
592 bq20z75_device->gpio_detect = false;
593 goto skip_gpio;
594 }
595
596 irq = gpio_to_irq(pdata->battery_detect);
597 if (irq <= 0) {
598 dev_warn(&client->dev, "Failed to get gpio as irq: %d\n", irq);
599 gpio_free(pdata->battery_detect);
600 bq20z75_device->gpio_detect = false;
601 goto skip_gpio;
602 }
603
604 rc = request_irq(irq, bq20z75_irq,
605 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
606 dev_name(&client->dev), &bq20z75_device->power_supply);
607 if (rc) {
608 dev_warn(&client->dev, "Failed to request irq: %d\n", rc);
609 gpio_free(pdata->battery_detect);
610 bq20z75_device->gpio_detect = false;
611 goto skip_gpio;
612 }
613
614 bq20z75_device->irq = irq;
615
616skip_gpio:
617
618 rc = power_supply_register(&client->dev, &bq20z75_device->power_supply);
619 if (rc) {
620 dev_err(&client->dev,
621 "%s: Failed to register power supply\n", __func__);
622 goto exit_psupply;
623 }
624
625 dev_info(&client->dev,
626 "%s: battery gas gauge device registered\n", client->name);
627
628 return 0;
629
630exit_psupply:
631 if (bq20z75_device->irq)
632 free_irq(bq20z75_device->irq, &bq20z75_device->power_supply);
633 if (bq20z75_device->gpio_detect)
634 gpio_free(pdata->battery_detect);
635
636 kfree(bq20z75_device);
637
638 return rc;
639}
640
641static int __devexit bq20z75_remove(struct i2c_client *client)
642{
643 struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
644
645 if (bq20z75_device->irq)
646 free_irq(bq20z75_device->irq, &bq20z75_device->power_supply);
647 if (bq20z75_device->gpio_detect)
648 gpio_free(bq20z75_device->pdata->battery_detect);
649
650 power_supply_unregister(&bq20z75_device->power_supply);
651 kfree(bq20z75_device);
652 bq20z75_device = NULL;
653
654 return 0;
655}
656
657#if defined CONFIG_PM
658static int bq20z75_suspend(struct i2c_client *client,
659 pm_message_t state)
660{
661 struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
662 s32 ret;
663
664 /* write to manufacturer access with sleep command */
665 ret = bq20z75_write_word_data(client,
666 bq20z75_data[REG_MANUFACTURER_DATA].addr,
667 MANUFACTURER_ACCESS_SLEEP);
668 if (bq20z75_device->is_present && ret < 0)
669 return ret;
670
671 return 0;
672}
673#else
674#define bq20z75_suspend NULL
675#endif
676/* any smbus transaction will wake up bq20z75 */
677#define bq20z75_resume NULL
678
679static const struct i2c_device_id bq20z75_id[] = {
680 { "bq20z75", 0 },
681 {}
682};
683MODULE_DEVICE_TABLE(i2c, bq20z75_id);
684
685static struct i2c_driver bq20z75_battery_driver = {
686 .probe = bq20z75_probe,
687 .remove = __devexit_p(bq20z75_remove),
688 .suspend = bq20z75_suspend,
689 .resume = bq20z75_resume,
690 .id_table = bq20z75_id,
691 .driver = {
692 .name = "bq20z75-battery",
693 },
694};
695
696static int __init bq20z75_battery_init(void)
697{
698 return i2c_add_driver(&bq20z75_battery_driver);
699}
700module_init(bq20z75_battery_init);
701
702static void __exit bq20z75_battery_exit(void)
703{
704 i2c_del_driver(&bq20z75_battery_driver);
705}
706module_exit(bq20z75_battery_exit);
707
708MODULE_DESCRIPTION("BQ20z75 battery monitor driver");
709MODULE_LICENSE("GPL");