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bq20z75: Fix issues with present and suspend
[deliverable/linux.git] / drivers / power / bq20z75.c
CommitLineData
a7640bfa
RK		 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>
bb879101
RK		 28#include <linux/interrupt.h>
29#include <linux/gpio.h>
30
31#include <linux/power/bq20z75.h>
a7640bfa
RK		 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,
d3ab61ec
RK		 43 REG_SERIAL_NUMBER,
44 REG_REMAINING_CAPACITY,
51d07566 45 REG_REMAINING_CAPACITY_CHARGE,
d3ab61ec 46 REG_FULL_CHARGE_CAPACITY,
51d07566 47 REG_FULL_CHARGE_CAPACITY_CHARGE,
d3ab61ec 48 REG_DESIGN_CAPACITY,
51d07566 49 REG_DESIGN_CAPACITY_CHARGE,
d3ab61ec 50 REG_DESIGN_VOLTAGE,
a7640bfa
RK		 51};
52
51d07566
RK		 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
a7640bfa
RK		 61/* manufacturer access defines */
62#define MANUFACTURER_ACCESS_STATUS 0x0006
63#define MANUFACTURER_ACCESS_SLEEP 0x0011
64
65/* battery status value bits */
d3ab61ec 66#define BATTERY_DISCHARGING 0x40
a7640bfa
RK		 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),
d3ab61ec
RK		 94 [REG_REMAINING_CAPACITY] =
95 BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_NOW, 0x0F, 0, 65535),
51d07566
RK		 96 [REG_REMAINING_CAPACITY_CHARGE] =
97 BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_NOW, 0x0F, 0, 65535),
d3ab61ec
RK		 98 [REG_FULL_CHARGE_CAPACITY] =
99 BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_FULL, 0x10, 0, 65535),
51d07566
RK		 100 [REG_FULL_CHARGE_CAPACITY_CHARGE] =
101 BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_FULL, 0x10, 0, 65535),
a7640bfa
RK		 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),
d3ab61ec
RK		 112 [REG_DESIGN_CAPACITY] =
113 BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 0x18, 0,
114 65535),
51d07566
RK		 115 [REG_DESIGN_CAPACITY_CHARGE] =
116 BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 0x18, 0,
117 65535),
d3ab61ec
RK		 118 [REG_DESIGN_VOLTAGE] =
119 BQ20Z75_DATA(POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 0x19, 0,
120 65535),
a7640bfa
RK		 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,
d3ab61ec
RK		 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,
51d07566
RK		 142 POWER_SUPPLY_PROP_CHARGE_NOW,
143 POWER_SUPPLY_PROP_CHARGE_FULL,
144 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
a7640bfa
RK		 145};
146
147struct bq20z75_info {
bb879101
RK		 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;
a7640bfa
RK		 155};
156
d3ab61ec
RK		 157static int bq20z75_read_word_data(struct i2c_client *client, u8 address)
158{
ff28fcef
RK		 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 }
d3ab61ec 172
d3ab61ec 173 if (ret < 0) {
a7d9ace4 174 dev_dbg(&client->dev,
d3ab61ec
RK		 175 "%s: i2c read at address 0x%x failed\n",
176 __func__, address);
177 return ret;
178 }
ff28fcef 179
d3ab61ec
RK		 180 return le16_to_cpu(ret);
181}
182
183static int bq20z75_write_word_data(struct i2c_client *client, u8 address,
184 u16 value)
185{
ff28fcef
RK		 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 }
d3ab61ec 200
d3ab61ec 201 if (ret < 0) {
a7d9ace4 202 dev_dbg(&client->dev,
d3ab61ec
RK		 203 "%s: i2c write to address 0x%x failed\n",
204 __func__, address);
205 return ret;
206 }
ff28fcef 207
d3ab61ec
RK		 208 return 0;
209}
210
a7640bfa
RK		 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;
bb879101
RK		 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;
a7d9ace4 226 bq20z75_device->is_present = val->intval;
bb879101
RK		 227 return ret;
228 }
a7640bfa
RK		 229
230 /* Write to ManufacturerAccess with
231 * ManufacturerAccess command and then
232 * read the status */
d3ab61ec 233 ret = bq20z75_write_word_data(client,
a7640bfa
RK		 234 bq20z75_data[REG_MANUFACTURER_DATA].addr,
235 MANUFACTURER_ACCESS_STATUS);
bb879101
RK		 236 if (ret < 0) {
237 if (psp == POWER_SUPPLY_PROP_PRESENT)
238 val->intval = 0; /* battery removed */
d3ab61ec 239 return ret;
bb879101 240 }
a7640bfa 241
a7d9ace4
RK		 242 ret = bq20z75_read_word_data(client,
243 bq20z75_data[REG_MANUFACTURER_DATA].addr);
244 if (ret < 0)
245 return ret;
246
a7640bfa
RK		 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
d3ab61ec 284 ret = bq20z75_read_word_data(client,
a7640bfa 285 bq20z75_data[reg_offset].addr);
d3ab61ec
RK		 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;
a7640bfa
RK		 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) {
d3ab61ec 297 if (ret & BATTERY_FULL_CHARGED)
a7640bfa
RK		 298 val->intval = POWER_SUPPLY_STATUS_FULL;
299 else if (ret & BATTERY_FULL_DISCHARGED)
300 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
d3ab61ec 301 else if (ret & BATTERY_DISCHARGING)
a7640bfa 302 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
d3ab61ec
RK		 303 else
304 val->intval = POWER_SUPPLY_STATUS_CHARGING;
a7640bfa 305 }
a7640bfa
RK		 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
d3ab61ec
RK		 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 600
322#define TEMP_KELVIN_TO_CELCIUS 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 val->intval *= BATTERY_MODE_CAP_MULT_WATT;
328 break;
329
330 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
331 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
332 case POWER_SUPPLY_PROP_CURRENT_NOW:
51d07566
RK		 333 case POWER_SUPPLY_PROP_CHARGE_NOW:
334 case POWER_SUPPLY_PROP_CHARGE_FULL:
335 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
d3ab61ec
RK		 336 val->intval *= BASE_UNIT_CONVERSION;
337 break;
338
339 case POWER_SUPPLY_PROP_TEMP:
340 /* bq20z75 provides battery tempreture in 0.1°K
341 * so convert it to 0.1°C */
342 val->intval -= TEMP_KELVIN_TO_CELCIUS;
343 val->intval *= 10;
344 break;
345
346 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
347 case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
348 val->intval *= TIME_UNIT_CONVERSION;
349 break;
350
351 default:
352 dev_dbg(&client->dev,
353 "%s: no need for unit conversion %d\n", __func__, psp);
354 }
355}
356
51d07566
RK		 357static enum bq20z75_battery_mode
358bq20z75_set_battery_mode(struct i2c_client *client,
359 enum bq20z75_battery_mode mode)
360{
361 int ret, original_val;
362
363 original_val = bq20z75_read_word_data(client, BATTERY_MODE_OFFSET);
364 if (original_val < 0)
365 return original_val;
366
367 if ((original_val & BATTERY_MODE_MASK) == mode)
368 return mode;
369
370 if (mode == BATTERY_MODE_AMPS)
371 ret = original_val & ~BATTERY_MODE_MASK;
372 else
373 ret = original_val | BATTERY_MODE_MASK;
374
375 ret = bq20z75_write_word_data(client, BATTERY_MODE_OFFSET, ret);
376 if (ret < 0)
377 return ret;
378
379 return original_val & BATTERY_MODE_MASK;
380}
381
a7640bfa 382static int bq20z75_get_battery_capacity(struct i2c_client *client,
d3ab61ec 383 int reg_offset, enum power_supply_property psp,
a7640bfa
RK		 384 union power_supply_propval *val)
385{
386 s32 ret;
51d07566
RK		 387 enum bq20z75_battery_mode mode = BATTERY_MODE_WATTS;
388
389 if (power_supply_is_amp_property(psp))
390 mode = BATTERY_MODE_AMPS;
391
392 mode = bq20z75_set_battery_mode(client, mode);
393 if (mode < 0)
394 return mode;
a7640bfa 395
d3ab61ec
RK		 396 ret = bq20z75_read_word_data(client, bq20z75_data[reg_offset].addr);
397 if (ret < 0)
398 return ret;
a7640bfa 399
d3ab61ec
RK		 400 if (psp == POWER_SUPPLY_PROP_CAPACITY) {
401 /* bq20z75 spec says that this can be >100 %
402 * even if max value is 100 % */
403 val->intval = min(ret, 100);
404 } else
405 val->intval = ret;
406
51d07566
RK		 407 ret = bq20z75_set_battery_mode(client, mode);
408 if (ret < 0)
409 return ret;
410
d3ab61ec
RK		 411 return 0;
412}
413
414static char bq20z75_serial[5];
415static int bq20z75_get_battery_serial_number(struct i2c_client *client,
416 union power_supply_propval *val)
417{
418 int ret;
419
420 ret = bq20z75_read_word_data(client,
421 bq20z75_data[REG_SERIAL_NUMBER].addr);
422 if (ret < 0)
423 return ret;
424
425 ret = sprintf(bq20z75_serial, "%04x", ret);
426 val->strval = bq20z75_serial;
a7640bfa
RK		 427
428 return 0;
429}
430
51d07566
RK		 431static int bq20z75_get_property_index(struct i2c_client *client,
432 enum power_supply_property psp)
433{
434 int count;
435 for (count = 0; count < ARRAY_SIZE(bq20z75_data); count++)
436 if (psp == bq20z75_data[count].psp)
437 return count;
438
439 dev_warn(&client->dev,
440 "%s: Invalid Property - %d\n", __func__, psp);
441
442 return -EINVAL;
443}
444
a7640bfa
RK		 445static int bq20z75_get_property(struct power_supply *psy,
446 enum power_supply_property psp,
447 union power_supply_propval *val)
448{
bb879101 449 int ret = 0;
a7640bfa
RK		 450 struct bq20z75_info *bq20z75_device = container_of(psy,
451 struct bq20z75_info, power_supply);
452 struct i2c_client *client = bq20z75_device->client;
453
454 switch (psp) {
455 case POWER_SUPPLY_PROP_PRESENT:
456 case POWER_SUPPLY_PROP_HEALTH:
457 ret = bq20z75_get_battery_presence_and_health(client, psp, val);
a7d9ace4
RK		 458 if (psp == POWER_SUPPLY_PROP_PRESENT)
459 return 0;
a7640bfa
RK		 460 break;
461
462 case POWER_SUPPLY_PROP_TECHNOLOGY:
463 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
464 break;
465
d3ab61ec
RK		 466 case POWER_SUPPLY_PROP_ENERGY_NOW:
467 case POWER_SUPPLY_PROP_ENERGY_FULL:
468 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
51d07566
RK		 469 case POWER_SUPPLY_PROP_CHARGE_NOW:
470 case POWER_SUPPLY_PROP_CHARGE_FULL:
471 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
a7640bfa 472 case POWER_SUPPLY_PROP_CAPACITY:
bb879101
RK		 473 ret = bq20z75_get_property_index(client, psp);
474 if (ret < 0)
475 break;
d3ab61ec 476
bb879101 477 ret = bq20z75_get_battery_capacity(client, ret, psp, val);
d3ab61ec
RK		 478 break;
479
480 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
481 ret = bq20z75_get_battery_serial_number(client, val);
a7640bfa
RK		 482 break;
483
484 case POWER_SUPPLY_PROP_STATUS:
485 case POWER_SUPPLY_PROP_CYCLE_COUNT:
486 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
487 case POWER_SUPPLY_PROP_CURRENT_NOW:
488 case POWER_SUPPLY_PROP_TEMP:
489 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
490 case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
d3ab61ec 491 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
bb879101
RK		 492 ret = bq20z75_get_property_index(client, psp);
493 if (ret < 0)
494 break;
d3ab61ec 495
bb879101 496 ret = bq20z75_get_battery_property(client, ret, psp, val);
a7640bfa
RK		 497 break;
498
499 default:
500 dev_err(&client->dev,
501 "%s: INVALID property\n", __func__);
502 return -EINVAL;
503 }
504
bb879101
RK		 505 if (!bq20z75_device->enable_detection)
506 goto done;
507
508 if (!bq20z75_device->gpio_detect &&
509 bq20z75_device->is_present != (ret >= 0)) {
510 bq20z75_device->is_present = (ret >= 0);
511 power_supply_changed(&bq20z75_device->power_supply);
512 }
513
514done:
515 if (!ret) {
516 /* Convert units to match requirements for power supply class */
517 bq20z75_unit_adjustment(client, psp, val);
518 }
d3ab61ec 519
a7640bfa 520 dev_dbg(&client->dev,
a7d9ace4
RK		 521 "%s: property = %d, value = %x\n", __func__, psp, val->intval);
522
523 if (ret && bq20z75_device->is_present)
524 return ret;
525
526 /* battery not present, so return NODATA for properties */
527 if (ret)
528 return -ENODATA;
a7640bfa 529
a7d9ace4 530 return 0;
a7640bfa
RK		 531}
532
bb879101
RK		 533static irqreturn_t bq20z75_irq(int irq, void *devid)
534{
535 struct power_supply *battery = devid;
536
537 power_supply_changed(battery);
538
539 return IRQ_HANDLED;
540}
541
542static int __devinit bq20z75_probe(struct i2c_client *client,
a7640bfa
RK		 543 const struct i2c_device_id *id)
544{
545 struct bq20z75_info *bq20z75_device;
bb879101 546 struct bq20z75_platform_data *pdata = client->dev.platform_data;
a7640bfa 547 int rc;
bb879101 548 int irq;
a7640bfa
RK		 549
550 bq20z75_device = kzalloc(sizeof(struct bq20z75_info), GFP_KERNEL);
551 if (!bq20z75_device)
552 return -ENOMEM;
553
554 bq20z75_device->client = client;
bb879101
RK		 555 bq20z75_device->enable_detection = false;
556 bq20z75_device->gpio_detect = false;
a7640bfa
RK		 557 bq20z75_device->power_supply.name = "battery";
558 bq20z75_device->power_supply.type = POWER_SUPPLY_TYPE_BATTERY;
559 bq20z75_device->power_supply.properties = bq20z75_properties;
560 bq20z75_device->power_supply.num_properties =
561 ARRAY_SIZE(bq20z75_properties);
562 bq20z75_device->power_supply.get_property = bq20z75_get_property;
563
bb879101
RK		 564 if (pdata) {
565 bq20z75_device->gpio_detect =
566 gpio_is_valid(pdata->battery_detect);
567 bq20z75_device->pdata = pdata;
568 }
569
a7640bfa
RK		 570 i2c_set_clientdata(client, bq20z75_device);
571
bb879101
RK		 572 if (!bq20z75_device->gpio_detect)
573 goto skip_gpio;
574
575 rc = gpio_request(pdata->battery_detect, dev_name(&client->dev));
576 if (rc) {
577 dev_warn(&client->dev, "Failed to request gpio: %d\n", rc);
578 bq20z75_device->gpio_detect = false;
579 goto skip_gpio;
580 }
581
582 rc = gpio_direction_input(pdata->battery_detect);
583 if (rc) {
584 dev_warn(&client->dev, "Failed to get gpio as input: %d\n", rc);
585 gpio_free(pdata->battery_detect);
586 bq20z75_device->gpio_detect = false;
587 goto skip_gpio;
588 }
589
590 irq = gpio_to_irq(pdata->battery_detect);
591 if (irq <= 0) {
592 dev_warn(&client->dev, "Failed to get gpio as irq: %d\n", irq);
593 gpio_free(pdata->battery_detect);
594 bq20z75_device->gpio_detect = false;
595 goto skip_gpio;
596 }
597
598 rc = request_irq(irq, bq20z75_irq,
599 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
600 dev_name(&client->dev), &bq20z75_device->power_supply);
601 if (rc) {
602 dev_warn(&client->dev, "Failed to request irq: %d\n", rc);
603 gpio_free(pdata->battery_detect);
604 bq20z75_device->gpio_detect = false;
605 goto skip_gpio;
606 }
607
608 bq20z75_device->irq = irq;
609
610skip_gpio:
611
a7640bfa
RK		 612 rc = power_supply_register(&client->dev, &bq20z75_device->power_supply);
613 if (rc) {
614 dev_err(&client->dev,
615 "%s: Failed to register power supply\n", __func__);
bb879101 616 goto exit_psupply;
a7640bfa
RK		 617 }
618
619 dev_info(&client->dev,
620 "%s: battery gas gauge device registered\n", client->name);
621
622 return 0;
bb879101
RK		 623
624exit_psupply:
625 if (bq20z75_device->irq)
626 free_irq(bq20z75_device->irq, &bq20z75_device->power_supply);
627 if (bq20z75_device->gpio_detect)
628 gpio_free(pdata->battery_detect);
629
630 kfree(bq20z75_device);
631
632 return rc;
a7640bfa
RK		 633}
634
bb879101 635static int __devexit bq20z75_remove(struct i2c_client *client)
a7640bfa
RK		 636{
637 struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
638
bb879101
RK		 639 if (bq20z75_device->irq)
640 free_irq(bq20z75_device->irq, &bq20z75_device->power_supply);
641 if (bq20z75_device->gpio_detect)
642 gpio_free(bq20z75_device->pdata->battery_detect);
643
a7640bfa
RK		 644 power_supply_unregister(&bq20z75_device->power_supply);
645 kfree(bq20z75_device);
646 bq20z75_device = NULL;
647
648 return 0;
649}
650
651#if defined CONFIG_PM
652static int bq20z75_suspend(struct i2c_client *client,
653 pm_message_t state)
654{
a7d9ace4 655 struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
a7640bfa
RK		 656 s32 ret;
657
658 /* write to manufacturer access with sleep command */
d3ab61ec 659 ret = bq20z75_write_word_data(client,
a7640bfa
RK		 660 bq20z75_data[REG_MANUFACTURER_DATA].addr,
661 MANUFACTURER_ACCESS_SLEEP);
a7d9ace4 662 if (bq20z75_device->is_present && ret < 0)
d3ab61ec 663 return ret;
a7640bfa
RK		 664
665 return 0;
666}
667#else
668#define bq20z75_suspend NULL
669#endif
670/* any smbus transaction will wake up bq20z75 */
671#define bq20z75_resume NULL
672
673static const struct i2c_device_id bq20z75_id[] = {
674 { "bq20z75", 0 },
675 {}
676};
f3da0dee 677MODULE_DEVICE_TABLE(i2c, bq20z75_id);
a7640bfa
RK		 678
679static struct i2c_driver bq20z75_battery_driver = {
680 .probe = bq20z75_probe,
bb879101 681 .remove = __devexit_p(bq20z75_remove),
a7640bfa
RK		 682 .suspend = bq20z75_suspend,
683 .resume = bq20z75_resume,
684 .id_table = bq20z75_id,
685 .driver = {
686 .name = "bq20z75-battery",
687 },
688};
689
690static int __init bq20z75_battery_init(void)
691{
692 return i2c_add_driver(&bq20z75_battery_driver);
693}
694module_init(bq20z75_battery_init);
695
696static void __exit bq20z75_battery_exit(void)
697{
698 i2c_del_driver(&bq20z75_battery_driver);
699}
700module_exit(bq20z75_battery_exit);
701
702MODULE_DESCRIPTION("BQ20z75 battery monitor driver");
703MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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