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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> | |
28 | ||
29 | enum { | |
30 | REG_MANUFACTURER_DATA, | |
31 | REG_TEMPERATURE, | |
32 | REG_VOLTAGE, | |
33 | REG_CURRENT, | |
34 | REG_CAPACITY, | |
35 | REG_TIME_TO_EMPTY, | |
36 | REG_TIME_TO_FULL, | |
37 | REG_STATUS, | |
38 | REG_CYCLE_COUNT, | |
d3ab61ec RK |
39 | REG_SERIAL_NUMBER, |
40 | REG_REMAINING_CAPACITY, | |
51d07566 | 41 | REG_REMAINING_CAPACITY_CHARGE, |
d3ab61ec | 42 | REG_FULL_CHARGE_CAPACITY, |
51d07566 | 43 | REG_FULL_CHARGE_CAPACITY_CHARGE, |
d3ab61ec | 44 | REG_DESIGN_CAPACITY, |
51d07566 | 45 | REG_DESIGN_CAPACITY_CHARGE, |
d3ab61ec | 46 | REG_DESIGN_VOLTAGE, |
a7640bfa RK |
47 | }; |
48 | ||
51d07566 RK |
49 | /* Battery Mode defines */ |
50 | #define BATTERY_MODE_OFFSET 0x03 | |
51 | #define BATTERY_MODE_MASK 0x8000 | |
52 | enum bq20z75_battery_mode { | |
53 | BATTERY_MODE_AMPS, | |
54 | BATTERY_MODE_WATTS | |
55 | }; | |
56 | ||
a7640bfa RK |
57 | /* manufacturer access defines */ |
58 | #define MANUFACTURER_ACCESS_STATUS 0x0006 | |
59 | #define MANUFACTURER_ACCESS_SLEEP 0x0011 | |
60 | ||
61 | /* battery status value bits */ | |
d3ab61ec | 62 | #define BATTERY_DISCHARGING 0x40 |
a7640bfa RK |
63 | #define BATTERY_FULL_CHARGED 0x20 |
64 | #define BATTERY_FULL_DISCHARGED 0x10 | |
65 | ||
66 | #define BQ20Z75_DATA(_psp, _addr, _min_value, _max_value) { \ | |
67 | .psp = _psp, \ | |
68 | .addr = _addr, \ | |
69 | .min_value = _min_value, \ | |
70 | .max_value = _max_value, \ | |
71 | } | |
72 | ||
73 | static const struct bq20z75_device_data { | |
74 | enum power_supply_property psp; | |
75 | u8 addr; | |
76 | int min_value; | |
77 | int max_value; | |
78 | } bq20z75_data[] = { | |
79 | [REG_MANUFACTURER_DATA] = | |
80 | BQ20Z75_DATA(POWER_SUPPLY_PROP_PRESENT, 0x00, 0, 65535), | |
81 | [REG_TEMPERATURE] = | |
82 | BQ20Z75_DATA(POWER_SUPPLY_PROP_TEMP, 0x08, 0, 65535), | |
83 | [REG_VOLTAGE] = | |
84 | BQ20Z75_DATA(POWER_SUPPLY_PROP_VOLTAGE_NOW, 0x09, 0, 20000), | |
85 | [REG_CURRENT] = | |
86 | BQ20Z75_DATA(POWER_SUPPLY_PROP_CURRENT_NOW, 0x0A, -32768, | |
87 | 32767), | |
88 | [REG_CAPACITY] = | |
89 | BQ20Z75_DATA(POWER_SUPPLY_PROP_CAPACITY, 0x0E, 0, 100), | |
d3ab61ec RK |
90 | [REG_REMAINING_CAPACITY] = |
91 | BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_NOW, 0x0F, 0, 65535), | |
51d07566 RK |
92 | [REG_REMAINING_CAPACITY_CHARGE] = |
93 | BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_NOW, 0x0F, 0, 65535), | |
d3ab61ec RK |
94 | [REG_FULL_CHARGE_CAPACITY] = |
95 | BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_FULL, 0x10, 0, 65535), | |
51d07566 RK |
96 | [REG_FULL_CHARGE_CAPACITY_CHARGE] = |
97 | BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_FULL, 0x10, 0, 65535), | |
a7640bfa RK |
98 | [REG_TIME_TO_EMPTY] = |
99 | BQ20Z75_DATA(POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, 0x12, 0, | |
100 | 65535), | |
101 | [REG_TIME_TO_FULL] = | |
102 | BQ20Z75_DATA(POWER_SUPPLY_PROP_TIME_TO_FULL_AVG, 0x13, 0, | |
103 | 65535), | |
104 | [REG_STATUS] = | |
105 | BQ20Z75_DATA(POWER_SUPPLY_PROP_STATUS, 0x16, 0, 65535), | |
106 | [REG_CYCLE_COUNT] = | |
107 | BQ20Z75_DATA(POWER_SUPPLY_PROP_CYCLE_COUNT, 0x17, 0, 65535), | |
d3ab61ec RK |
108 | [REG_DESIGN_CAPACITY] = |
109 | BQ20Z75_DATA(POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 0x18, 0, | |
110 | 65535), | |
51d07566 RK |
111 | [REG_DESIGN_CAPACITY_CHARGE] = |
112 | BQ20Z75_DATA(POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 0x18, 0, | |
113 | 65535), | |
d3ab61ec RK |
114 | [REG_DESIGN_VOLTAGE] = |
115 | BQ20Z75_DATA(POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 0x19, 0, | |
116 | 65535), | |
a7640bfa RK |
117 | [REG_SERIAL_NUMBER] = |
118 | BQ20Z75_DATA(POWER_SUPPLY_PROP_SERIAL_NUMBER, 0x1C, 0, 65535), | |
119 | }; | |
120 | ||
121 | static enum power_supply_property bq20z75_properties[] = { | |
122 | POWER_SUPPLY_PROP_STATUS, | |
123 | POWER_SUPPLY_PROP_HEALTH, | |
124 | POWER_SUPPLY_PROP_PRESENT, | |
125 | POWER_SUPPLY_PROP_TECHNOLOGY, | |
126 | POWER_SUPPLY_PROP_CYCLE_COUNT, | |
127 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
128 | POWER_SUPPLY_PROP_CURRENT_NOW, | |
129 | POWER_SUPPLY_PROP_CAPACITY, | |
130 | POWER_SUPPLY_PROP_TEMP, | |
131 | POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, | |
132 | POWER_SUPPLY_PROP_TIME_TO_FULL_AVG, | |
133 | POWER_SUPPLY_PROP_SERIAL_NUMBER, | |
d3ab61ec RK |
134 | POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, |
135 | POWER_SUPPLY_PROP_ENERGY_NOW, | |
136 | POWER_SUPPLY_PROP_ENERGY_FULL, | |
137 | POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, | |
51d07566 RK |
138 | POWER_SUPPLY_PROP_CHARGE_NOW, |
139 | POWER_SUPPLY_PROP_CHARGE_FULL, | |
140 | POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, | |
a7640bfa RK |
141 | }; |
142 | ||
143 | struct bq20z75_info { | |
144 | struct i2c_client *client; | |
145 | struct power_supply power_supply; | |
146 | }; | |
147 | ||
d3ab61ec RK |
148 | static int bq20z75_read_word_data(struct i2c_client *client, u8 address) |
149 | { | |
150 | s32 ret; | |
151 | ||
152 | ret = i2c_smbus_read_word_data(client, address); | |
153 | if (ret < 0) { | |
154 | dev_err(&client->dev, | |
155 | "%s: i2c read at address 0x%x failed\n", | |
156 | __func__, address); | |
157 | return ret; | |
158 | } | |
159 | return le16_to_cpu(ret); | |
160 | } | |
161 | ||
162 | static int bq20z75_write_word_data(struct i2c_client *client, u8 address, | |
163 | u16 value) | |
164 | { | |
165 | s32 ret; | |
166 | ||
167 | ret = i2c_smbus_write_word_data(client, address, le16_to_cpu(value)); | |
168 | if (ret < 0) { | |
169 | dev_err(&client->dev, | |
170 | "%s: i2c write to address 0x%x failed\n", | |
171 | __func__, address); | |
172 | return ret; | |
173 | } | |
174 | return 0; | |
175 | } | |
176 | ||
a7640bfa RK |
177 | static int bq20z75_get_battery_presence_and_health( |
178 | struct i2c_client *client, enum power_supply_property psp, | |
179 | union power_supply_propval *val) | |
180 | { | |
181 | s32 ret; | |
182 | ||
183 | /* Write to ManufacturerAccess with | |
184 | * ManufacturerAccess command and then | |
185 | * read the status */ | |
d3ab61ec | 186 | ret = bq20z75_write_word_data(client, |
a7640bfa RK |
187 | bq20z75_data[REG_MANUFACTURER_DATA].addr, |
188 | MANUFACTURER_ACCESS_STATUS); | |
d3ab61ec RK |
189 | if (ret < 0) |
190 | return ret; | |
a7640bfa | 191 | |
d3ab61ec RK |
192 | |
193 | ret = bq20z75_read_word_data(client, | |
a7640bfa | 194 | bq20z75_data[REG_MANUFACTURER_DATA].addr); |
d3ab61ec RK |
195 | if (ret < 0) |
196 | return ret; | |
a7640bfa RK |
197 | |
198 | if (ret < bq20z75_data[REG_MANUFACTURER_DATA].min_value || | |
199 | ret > bq20z75_data[REG_MANUFACTURER_DATA].max_value) { | |
200 | val->intval = 0; | |
201 | return 0; | |
202 | } | |
203 | ||
204 | /* Mask the upper nibble of 2nd byte and | |
205 | * lower byte of response then | |
206 | * shift the result by 8 to get status*/ | |
207 | ret &= 0x0F00; | |
208 | ret >>= 8; | |
209 | if (psp == POWER_SUPPLY_PROP_PRESENT) { | |
210 | if (ret == 0x0F) | |
211 | /* battery removed */ | |
212 | val->intval = 0; | |
213 | else | |
214 | val->intval = 1; | |
215 | } else if (psp == POWER_SUPPLY_PROP_HEALTH) { | |
216 | if (ret == 0x09) | |
217 | val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; | |
218 | else if (ret == 0x0B) | |
219 | val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; | |
220 | else if (ret == 0x0C) | |
221 | val->intval = POWER_SUPPLY_HEALTH_DEAD; | |
222 | else | |
223 | val->intval = POWER_SUPPLY_HEALTH_GOOD; | |
224 | } | |
225 | ||
226 | return 0; | |
227 | } | |
228 | ||
229 | static int bq20z75_get_battery_property(struct i2c_client *client, | |
230 | int reg_offset, enum power_supply_property psp, | |
231 | union power_supply_propval *val) | |
232 | { | |
233 | s32 ret; | |
234 | ||
d3ab61ec | 235 | ret = bq20z75_read_word_data(client, |
a7640bfa | 236 | bq20z75_data[reg_offset].addr); |
d3ab61ec RK |
237 | if (ret < 0) |
238 | return ret; | |
239 | ||
240 | /* returned values are 16 bit */ | |
241 | if (bq20z75_data[reg_offset].min_value < 0) | |
242 | ret = (s16)ret; | |
a7640bfa RK |
243 | |
244 | if (ret >= bq20z75_data[reg_offset].min_value && | |
245 | ret <= bq20z75_data[reg_offset].max_value) { | |
246 | val->intval = ret; | |
247 | if (psp == POWER_SUPPLY_PROP_STATUS) { | |
d3ab61ec | 248 | if (ret & BATTERY_FULL_CHARGED) |
a7640bfa RK |
249 | val->intval = POWER_SUPPLY_STATUS_FULL; |
250 | else if (ret & BATTERY_FULL_DISCHARGED) | |
251 | val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
d3ab61ec | 252 | else if (ret & BATTERY_DISCHARGING) |
a7640bfa | 253 | val->intval = POWER_SUPPLY_STATUS_DISCHARGING; |
d3ab61ec RK |
254 | else |
255 | val->intval = POWER_SUPPLY_STATUS_CHARGING; | |
a7640bfa | 256 | } |
a7640bfa RK |
257 | } else { |
258 | if (psp == POWER_SUPPLY_PROP_STATUS) | |
259 | val->intval = POWER_SUPPLY_STATUS_UNKNOWN; | |
260 | else | |
261 | val->intval = 0; | |
262 | } | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
d3ab61ec RK |
267 | static void bq20z75_unit_adjustment(struct i2c_client *client, |
268 | enum power_supply_property psp, union power_supply_propval *val) | |
269 | { | |
270 | #define BASE_UNIT_CONVERSION 1000 | |
271 | #define BATTERY_MODE_CAP_MULT_WATT (10 * BASE_UNIT_CONVERSION) | |
272 | #define TIME_UNIT_CONVERSION 600 | |
273 | #define TEMP_KELVIN_TO_CELCIUS 2731 | |
274 | switch (psp) { | |
275 | case POWER_SUPPLY_PROP_ENERGY_NOW: | |
276 | case POWER_SUPPLY_PROP_ENERGY_FULL: | |
277 | case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: | |
278 | val->intval *= BATTERY_MODE_CAP_MULT_WATT; | |
279 | break; | |
280 | ||
281 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
282 | case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: | |
283 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
51d07566 RK |
284 | case POWER_SUPPLY_PROP_CHARGE_NOW: |
285 | case POWER_SUPPLY_PROP_CHARGE_FULL: | |
286 | case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: | |
d3ab61ec RK |
287 | val->intval *= BASE_UNIT_CONVERSION; |
288 | break; | |
289 | ||
290 | case POWER_SUPPLY_PROP_TEMP: | |
291 | /* bq20z75 provides battery tempreture in 0.1°K | |
292 | * so convert it to 0.1°C */ | |
293 | val->intval -= TEMP_KELVIN_TO_CELCIUS; | |
294 | val->intval *= 10; | |
295 | break; | |
296 | ||
297 | case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG: | |
298 | case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG: | |
299 | val->intval *= TIME_UNIT_CONVERSION; | |
300 | break; | |
301 | ||
302 | default: | |
303 | dev_dbg(&client->dev, | |
304 | "%s: no need for unit conversion %d\n", __func__, psp); | |
305 | } | |
306 | } | |
307 | ||
51d07566 RK |
308 | static enum bq20z75_battery_mode |
309 | bq20z75_set_battery_mode(struct i2c_client *client, | |
310 | enum bq20z75_battery_mode mode) | |
311 | { | |
312 | int ret, original_val; | |
313 | ||
314 | original_val = bq20z75_read_word_data(client, BATTERY_MODE_OFFSET); | |
315 | if (original_val < 0) | |
316 | return original_val; | |
317 | ||
318 | if ((original_val & BATTERY_MODE_MASK) == mode) | |
319 | return mode; | |
320 | ||
321 | if (mode == BATTERY_MODE_AMPS) | |
322 | ret = original_val & ~BATTERY_MODE_MASK; | |
323 | else | |
324 | ret = original_val | BATTERY_MODE_MASK; | |
325 | ||
326 | ret = bq20z75_write_word_data(client, BATTERY_MODE_OFFSET, ret); | |
327 | if (ret < 0) | |
328 | return ret; | |
329 | ||
330 | return original_val & BATTERY_MODE_MASK; | |
331 | } | |
332 | ||
a7640bfa | 333 | static int bq20z75_get_battery_capacity(struct i2c_client *client, |
d3ab61ec | 334 | int reg_offset, enum power_supply_property psp, |
a7640bfa RK |
335 | union power_supply_propval *val) |
336 | { | |
337 | s32 ret; | |
51d07566 RK |
338 | enum bq20z75_battery_mode mode = BATTERY_MODE_WATTS; |
339 | ||
340 | if (power_supply_is_amp_property(psp)) | |
341 | mode = BATTERY_MODE_AMPS; | |
342 | ||
343 | mode = bq20z75_set_battery_mode(client, mode); | |
344 | if (mode < 0) | |
345 | return mode; | |
a7640bfa | 346 | |
d3ab61ec RK |
347 | ret = bq20z75_read_word_data(client, bq20z75_data[reg_offset].addr); |
348 | if (ret < 0) | |
349 | return ret; | |
a7640bfa | 350 | |
d3ab61ec RK |
351 | if (psp == POWER_SUPPLY_PROP_CAPACITY) { |
352 | /* bq20z75 spec says that this can be >100 % | |
353 | * even if max value is 100 % */ | |
354 | val->intval = min(ret, 100); | |
355 | } else | |
356 | val->intval = ret; | |
357 | ||
51d07566 RK |
358 | ret = bq20z75_set_battery_mode(client, mode); |
359 | if (ret < 0) | |
360 | return ret; | |
361 | ||
d3ab61ec RK |
362 | return 0; |
363 | } | |
364 | ||
365 | static char bq20z75_serial[5]; | |
366 | static int bq20z75_get_battery_serial_number(struct i2c_client *client, | |
367 | union power_supply_propval *val) | |
368 | { | |
369 | int ret; | |
370 | ||
371 | ret = bq20z75_read_word_data(client, | |
372 | bq20z75_data[REG_SERIAL_NUMBER].addr); | |
373 | if (ret < 0) | |
374 | return ret; | |
375 | ||
376 | ret = sprintf(bq20z75_serial, "%04x", ret); | |
377 | val->strval = bq20z75_serial; | |
a7640bfa RK |
378 | |
379 | return 0; | |
380 | } | |
381 | ||
51d07566 RK |
382 | static int bq20z75_get_property_index(struct i2c_client *client, |
383 | enum power_supply_property psp) | |
384 | { | |
385 | int count; | |
386 | for (count = 0; count < ARRAY_SIZE(bq20z75_data); count++) | |
387 | if (psp == bq20z75_data[count].psp) | |
388 | return count; | |
389 | ||
390 | dev_warn(&client->dev, | |
391 | "%s: Invalid Property - %d\n", __func__, psp); | |
392 | ||
393 | return -EINVAL; | |
394 | } | |
395 | ||
a7640bfa RK |
396 | static int bq20z75_get_property(struct power_supply *psy, |
397 | enum power_supply_property psp, | |
398 | union power_supply_propval *val) | |
399 | { | |
51d07566 | 400 | int ps_index; |
a7640bfa RK |
401 | int ret; |
402 | struct bq20z75_info *bq20z75_device = container_of(psy, | |
403 | struct bq20z75_info, power_supply); | |
404 | struct i2c_client *client = bq20z75_device->client; | |
405 | ||
406 | switch (psp) { | |
407 | case POWER_SUPPLY_PROP_PRESENT: | |
408 | case POWER_SUPPLY_PROP_HEALTH: | |
409 | ret = bq20z75_get_battery_presence_and_health(client, psp, val); | |
410 | if (ret) | |
411 | return ret; | |
412 | break; | |
413 | ||
414 | case POWER_SUPPLY_PROP_TECHNOLOGY: | |
415 | val->intval = POWER_SUPPLY_TECHNOLOGY_LION; | |
416 | break; | |
417 | ||
d3ab61ec RK |
418 | case POWER_SUPPLY_PROP_ENERGY_NOW: |
419 | case POWER_SUPPLY_PROP_ENERGY_FULL: | |
420 | case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: | |
51d07566 RK |
421 | case POWER_SUPPLY_PROP_CHARGE_NOW: |
422 | case POWER_SUPPLY_PROP_CHARGE_FULL: | |
423 | case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: | |
a7640bfa | 424 | case POWER_SUPPLY_PROP_CAPACITY: |
51d07566 RK |
425 | ps_index = bq20z75_get_property_index(client, psp); |
426 | if (ps_index < 0) | |
427 | return ps_index; | |
d3ab61ec | 428 | |
51d07566 | 429 | ret = bq20z75_get_battery_capacity(client, ps_index, psp, val); |
d3ab61ec RK |
430 | if (ret) |
431 | return ret; | |
432 | ||
433 | break; | |
434 | ||
435 | case POWER_SUPPLY_PROP_SERIAL_NUMBER: | |
436 | ret = bq20z75_get_battery_serial_number(client, val); | |
a7640bfa RK |
437 | if (ret) |
438 | return ret; | |
439 | break; | |
440 | ||
441 | case POWER_SUPPLY_PROP_STATUS: | |
442 | case POWER_SUPPLY_PROP_CYCLE_COUNT: | |
443 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
444 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
445 | case POWER_SUPPLY_PROP_TEMP: | |
446 | case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG: | |
447 | case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG: | |
d3ab61ec | 448 | case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: |
51d07566 RK |
449 | ps_index = bq20z75_get_property_index(client, psp); |
450 | if (ps_index < 0) | |
451 | return ps_index; | |
a7640bfa | 452 | |
51d07566 | 453 | ret = bq20z75_get_battery_property(client, ps_index, psp, val); |
a7640bfa RK |
454 | if (ret) |
455 | return ret; | |
d3ab61ec | 456 | |
a7640bfa RK |
457 | break; |
458 | ||
459 | default: | |
460 | dev_err(&client->dev, | |
461 | "%s: INVALID property\n", __func__); | |
462 | return -EINVAL; | |
463 | } | |
464 | ||
d3ab61ec RK |
465 | /* Convert units to match requirements for power supply class */ |
466 | bq20z75_unit_adjustment(client, psp, val); | |
467 | ||
a7640bfa RK |
468 | dev_dbg(&client->dev, |
469 | "%s: property = %d, value = %d\n", __func__, psp, val->intval); | |
470 | ||
471 | return 0; | |
472 | } | |
473 | ||
474 | static int bq20z75_probe(struct i2c_client *client, | |
475 | const struct i2c_device_id *id) | |
476 | { | |
477 | struct bq20z75_info *bq20z75_device; | |
478 | int rc; | |
479 | ||
480 | bq20z75_device = kzalloc(sizeof(struct bq20z75_info), GFP_KERNEL); | |
481 | if (!bq20z75_device) | |
482 | return -ENOMEM; | |
483 | ||
484 | bq20z75_device->client = client; | |
485 | bq20z75_device->power_supply.name = "battery"; | |
486 | bq20z75_device->power_supply.type = POWER_SUPPLY_TYPE_BATTERY; | |
487 | bq20z75_device->power_supply.properties = bq20z75_properties; | |
488 | bq20z75_device->power_supply.num_properties = | |
489 | ARRAY_SIZE(bq20z75_properties); | |
490 | bq20z75_device->power_supply.get_property = bq20z75_get_property; | |
491 | ||
492 | i2c_set_clientdata(client, bq20z75_device); | |
493 | ||
494 | rc = power_supply_register(&client->dev, &bq20z75_device->power_supply); | |
495 | if (rc) { | |
496 | dev_err(&client->dev, | |
497 | "%s: Failed to register power supply\n", __func__); | |
498 | kfree(bq20z75_device); | |
499 | return rc; | |
500 | } | |
501 | ||
502 | dev_info(&client->dev, | |
503 | "%s: battery gas gauge device registered\n", client->name); | |
504 | ||
505 | return 0; | |
506 | } | |
507 | ||
508 | static int bq20z75_remove(struct i2c_client *client) | |
509 | { | |
510 | struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client); | |
511 | ||
512 | power_supply_unregister(&bq20z75_device->power_supply); | |
513 | kfree(bq20z75_device); | |
514 | bq20z75_device = NULL; | |
515 | ||
516 | return 0; | |
517 | } | |
518 | ||
519 | #if defined CONFIG_PM | |
520 | static int bq20z75_suspend(struct i2c_client *client, | |
521 | pm_message_t state) | |
522 | { | |
523 | s32 ret; | |
524 | ||
525 | /* write to manufacturer access with sleep command */ | |
d3ab61ec | 526 | ret = bq20z75_write_word_data(client, |
a7640bfa RK |
527 | bq20z75_data[REG_MANUFACTURER_DATA].addr, |
528 | MANUFACTURER_ACCESS_SLEEP); | |
d3ab61ec RK |
529 | if (ret < 0) |
530 | return ret; | |
a7640bfa RK |
531 | |
532 | return 0; | |
533 | } | |
534 | #else | |
535 | #define bq20z75_suspend NULL | |
536 | #endif | |
537 | /* any smbus transaction will wake up bq20z75 */ | |
538 | #define bq20z75_resume NULL | |
539 | ||
540 | static const struct i2c_device_id bq20z75_id[] = { | |
541 | { "bq20z75", 0 }, | |
542 | {} | |
543 | }; | |
544 | ||
545 | static struct i2c_driver bq20z75_battery_driver = { | |
546 | .probe = bq20z75_probe, | |
547 | .remove = bq20z75_remove, | |
548 | .suspend = bq20z75_suspend, | |
549 | .resume = bq20z75_resume, | |
550 | .id_table = bq20z75_id, | |
551 | .driver = { | |
552 | .name = "bq20z75-battery", | |
553 | }, | |
554 | }; | |
555 | ||
556 | static int __init bq20z75_battery_init(void) | |
557 | { | |
558 | return i2c_add_driver(&bq20z75_battery_driver); | |
559 | } | |
560 | module_init(bq20z75_battery_init); | |
561 | ||
562 | static void __exit bq20z75_battery_exit(void) | |
563 | { | |
564 | i2c_del_driver(&bq20z75_battery_driver); | |
565 | } | |
566 | module_exit(bq20z75_battery_exit); | |
567 | ||
568 | MODULE_DESCRIPTION("BQ20z75 battery monitor driver"); | |
569 | MODULE_LICENSE("GPL"); |