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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> | |
bb879101 RK |
28 | #include <linux/interrupt.h> |
29 | #include <linux/gpio.h> | |
30 | ||
31 | #include <linux/power/bq20z75.h> | |
a7640bfa RK |
32 | |
33 | enum { | |
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 | |
56 | enum 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 | ||
77 | static 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 | ||
125 | static 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 | ||
147 | struct 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 |
157 | static int bq20z75_read_word_data(struct i2c_client *client, u8 address) |
158 | { | |
159 | s32 ret; | |
160 | ||
161 | ret = i2c_smbus_read_word_data(client, address); | |
162 | if (ret < 0) { | |
163 | dev_err(&client->dev, | |
164 | "%s: i2c read at address 0x%x failed\n", | |
165 | __func__, address); | |
166 | return ret; | |
167 | } | |
168 | return le16_to_cpu(ret); | |
169 | } | |
170 | ||
171 | static int bq20z75_write_word_data(struct i2c_client *client, u8 address, | |
172 | u16 value) | |
173 | { | |
174 | s32 ret; | |
175 | ||
176 | ret = i2c_smbus_write_word_data(client, address, le16_to_cpu(value)); | |
177 | if (ret < 0) { | |
178 | dev_err(&client->dev, | |
179 | "%s: i2c write to address 0x%x failed\n", | |
180 | __func__, address); | |
181 | return ret; | |
182 | } | |
183 | return 0; | |
184 | } | |
185 | ||
a7640bfa RK |
186 | static int bq20z75_get_battery_presence_and_health( |
187 | struct i2c_client *client, enum power_supply_property psp, | |
188 | union power_supply_propval *val) | |
189 | { | |
190 | s32 ret; | |
bb879101 RK |
191 | struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client); |
192 | ||
193 | if (psp == POWER_SUPPLY_PROP_PRESENT && | |
194 | bq20z75_device->gpio_detect) { | |
195 | ret = gpio_get_value( | |
196 | bq20z75_device->pdata->battery_detect); | |
197 | if (ret == bq20z75_device->pdata->battery_detect_present) | |
198 | val->intval = 1; | |
199 | else | |
200 | val->intval = 0; | |
201 | return ret; | |
202 | } | |
a7640bfa RK |
203 | |
204 | /* Write to ManufacturerAccess with | |
205 | * ManufacturerAccess command and then | |
206 | * read the status */ | |
d3ab61ec | 207 | ret = bq20z75_write_word_data(client, |
a7640bfa RK |
208 | bq20z75_data[REG_MANUFACTURER_DATA].addr, |
209 | MANUFACTURER_ACCESS_STATUS); | |
d3ab61ec RK |
210 | if (ret < 0) |
211 | return ret; | |
a7640bfa | 212 | |
d3ab61ec RK |
213 | |
214 | ret = bq20z75_read_word_data(client, | |
a7640bfa | 215 | bq20z75_data[REG_MANUFACTURER_DATA].addr); |
bb879101 RK |
216 | if (ret < 0) { |
217 | if (psp == POWER_SUPPLY_PROP_PRESENT) | |
218 | val->intval = 0; /* battery removed */ | |
d3ab61ec | 219 | return ret; |
bb879101 | 220 | } |
a7640bfa RK |
221 | |
222 | if (ret < bq20z75_data[REG_MANUFACTURER_DATA].min_value || | |
223 | ret > bq20z75_data[REG_MANUFACTURER_DATA].max_value) { | |
224 | val->intval = 0; | |
225 | return 0; | |
226 | } | |
227 | ||
228 | /* Mask the upper nibble of 2nd byte and | |
229 | * lower byte of response then | |
230 | * shift the result by 8 to get status*/ | |
231 | ret &= 0x0F00; | |
232 | ret >>= 8; | |
233 | if (psp == POWER_SUPPLY_PROP_PRESENT) { | |
234 | if (ret == 0x0F) | |
235 | /* battery removed */ | |
236 | val->intval = 0; | |
237 | else | |
238 | val->intval = 1; | |
239 | } else if (psp == POWER_SUPPLY_PROP_HEALTH) { | |
240 | if (ret == 0x09) | |
241 | val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; | |
242 | else if (ret == 0x0B) | |
243 | val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; | |
244 | else if (ret == 0x0C) | |
245 | val->intval = POWER_SUPPLY_HEALTH_DEAD; | |
246 | else | |
247 | val->intval = POWER_SUPPLY_HEALTH_GOOD; | |
248 | } | |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
253 | static int bq20z75_get_battery_property(struct i2c_client *client, | |
254 | int reg_offset, enum power_supply_property psp, | |
255 | union power_supply_propval *val) | |
256 | { | |
257 | s32 ret; | |
258 | ||
d3ab61ec | 259 | ret = bq20z75_read_word_data(client, |
a7640bfa | 260 | bq20z75_data[reg_offset].addr); |
d3ab61ec RK |
261 | if (ret < 0) |
262 | return ret; | |
263 | ||
264 | /* returned values are 16 bit */ | |
265 | if (bq20z75_data[reg_offset].min_value < 0) | |
266 | ret = (s16)ret; | |
a7640bfa RK |
267 | |
268 | if (ret >= bq20z75_data[reg_offset].min_value && | |
269 | ret <= bq20z75_data[reg_offset].max_value) { | |
270 | val->intval = ret; | |
271 | if (psp == POWER_SUPPLY_PROP_STATUS) { | |
d3ab61ec | 272 | if (ret & BATTERY_FULL_CHARGED) |
a7640bfa RK |
273 | val->intval = POWER_SUPPLY_STATUS_FULL; |
274 | else if (ret & BATTERY_FULL_DISCHARGED) | |
275 | val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
d3ab61ec | 276 | else if (ret & BATTERY_DISCHARGING) |
a7640bfa | 277 | val->intval = POWER_SUPPLY_STATUS_DISCHARGING; |
d3ab61ec RK |
278 | else |
279 | val->intval = POWER_SUPPLY_STATUS_CHARGING; | |
a7640bfa | 280 | } |
a7640bfa RK |
281 | } else { |
282 | if (psp == POWER_SUPPLY_PROP_STATUS) | |
283 | val->intval = POWER_SUPPLY_STATUS_UNKNOWN; | |
284 | else | |
285 | val->intval = 0; | |
286 | } | |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
d3ab61ec RK |
291 | static void bq20z75_unit_adjustment(struct i2c_client *client, |
292 | enum power_supply_property psp, union power_supply_propval *val) | |
293 | { | |
294 | #define BASE_UNIT_CONVERSION 1000 | |
295 | #define BATTERY_MODE_CAP_MULT_WATT (10 * BASE_UNIT_CONVERSION) | |
296 | #define TIME_UNIT_CONVERSION 600 | |
297 | #define TEMP_KELVIN_TO_CELCIUS 2731 | |
298 | switch (psp) { | |
299 | case POWER_SUPPLY_PROP_ENERGY_NOW: | |
300 | case POWER_SUPPLY_PROP_ENERGY_FULL: | |
301 | case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: | |
302 | val->intval *= BATTERY_MODE_CAP_MULT_WATT; | |
303 | break; | |
304 | ||
305 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
306 | case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: | |
307 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
51d07566 RK |
308 | case POWER_SUPPLY_PROP_CHARGE_NOW: |
309 | case POWER_SUPPLY_PROP_CHARGE_FULL: | |
310 | case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: | |
d3ab61ec RK |
311 | val->intval *= BASE_UNIT_CONVERSION; |
312 | break; | |
313 | ||
314 | case POWER_SUPPLY_PROP_TEMP: | |
315 | /* bq20z75 provides battery tempreture in 0.1°K | |
316 | * so convert it to 0.1°C */ | |
317 | val->intval -= TEMP_KELVIN_TO_CELCIUS; | |
318 | val->intval *= 10; | |
319 | break; | |
320 | ||
321 | case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG: | |
322 | case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG: | |
323 | val->intval *= TIME_UNIT_CONVERSION; | |
324 | break; | |
325 | ||
326 | default: | |
327 | dev_dbg(&client->dev, | |
328 | "%s: no need for unit conversion %d\n", __func__, psp); | |
329 | } | |
330 | } | |
331 | ||
51d07566 RK |
332 | static enum bq20z75_battery_mode |
333 | bq20z75_set_battery_mode(struct i2c_client *client, | |
334 | enum bq20z75_battery_mode mode) | |
335 | { | |
336 | int ret, original_val; | |
337 | ||
338 | original_val = bq20z75_read_word_data(client, BATTERY_MODE_OFFSET); | |
339 | if (original_val < 0) | |
340 | return original_val; | |
341 | ||
342 | if ((original_val & BATTERY_MODE_MASK) == mode) | |
343 | return mode; | |
344 | ||
345 | if (mode == BATTERY_MODE_AMPS) | |
346 | ret = original_val & ~BATTERY_MODE_MASK; | |
347 | else | |
348 | ret = original_val | BATTERY_MODE_MASK; | |
349 | ||
350 | ret = bq20z75_write_word_data(client, BATTERY_MODE_OFFSET, ret); | |
351 | if (ret < 0) | |
352 | return ret; | |
353 | ||
354 | return original_val & BATTERY_MODE_MASK; | |
355 | } | |
356 | ||
a7640bfa | 357 | static int bq20z75_get_battery_capacity(struct i2c_client *client, |
d3ab61ec | 358 | int reg_offset, enum power_supply_property psp, |
a7640bfa RK |
359 | union power_supply_propval *val) |
360 | { | |
361 | s32 ret; | |
51d07566 RK |
362 | enum bq20z75_battery_mode mode = BATTERY_MODE_WATTS; |
363 | ||
364 | if (power_supply_is_amp_property(psp)) | |
365 | mode = BATTERY_MODE_AMPS; | |
366 | ||
367 | mode = bq20z75_set_battery_mode(client, mode); | |
368 | if (mode < 0) | |
369 | return mode; | |
a7640bfa | 370 | |
d3ab61ec RK |
371 | ret = bq20z75_read_word_data(client, bq20z75_data[reg_offset].addr); |
372 | if (ret < 0) | |
373 | return ret; | |
a7640bfa | 374 | |
d3ab61ec RK |
375 | if (psp == POWER_SUPPLY_PROP_CAPACITY) { |
376 | /* bq20z75 spec says that this can be >100 % | |
377 | * even if max value is 100 % */ | |
378 | val->intval = min(ret, 100); | |
379 | } else | |
380 | val->intval = ret; | |
381 | ||
51d07566 RK |
382 | ret = bq20z75_set_battery_mode(client, mode); |
383 | if (ret < 0) | |
384 | return ret; | |
385 | ||
d3ab61ec RK |
386 | return 0; |
387 | } | |
388 | ||
389 | static char bq20z75_serial[5]; | |
390 | static int bq20z75_get_battery_serial_number(struct i2c_client *client, | |
391 | union power_supply_propval *val) | |
392 | { | |
393 | int ret; | |
394 | ||
395 | ret = bq20z75_read_word_data(client, | |
396 | bq20z75_data[REG_SERIAL_NUMBER].addr); | |
397 | if (ret < 0) | |
398 | return ret; | |
399 | ||
400 | ret = sprintf(bq20z75_serial, "%04x", ret); | |
401 | val->strval = bq20z75_serial; | |
a7640bfa RK |
402 | |
403 | return 0; | |
404 | } | |
405 | ||
51d07566 RK |
406 | static int bq20z75_get_property_index(struct i2c_client *client, |
407 | enum power_supply_property psp) | |
408 | { | |
409 | int count; | |
410 | for (count = 0; count < ARRAY_SIZE(bq20z75_data); count++) | |
411 | if (psp == bq20z75_data[count].psp) | |
412 | return count; | |
413 | ||
414 | dev_warn(&client->dev, | |
415 | "%s: Invalid Property - %d\n", __func__, psp); | |
416 | ||
417 | return -EINVAL; | |
418 | } | |
419 | ||
a7640bfa RK |
420 | static int bq20z75_get_property(struct power_supply *psy, |
421 | enum power_supply_property psp, | |
422 | union power_supply_propval *val) | |
423 | { | |
bb879101 | 424 | int ret = 0; |
a7640bfa RK |
425 | struct bq20z75_info *bq20z75_device = container_of(psy, |
426 | struct bq20z75_info, power_supply); | |
427 | struct i2c_client *client = bq20z75_device->client; | |
428 | ||
429 | switch (psp) { | |
430 | case POWER_SUPPLY_PROP_PRESENT: | |
431 | case POWER_SUPPLY_PROP_HEALTH: | |
432 | ret = bq20z75_get_battery_presence_and_health(client, psp, val); | |
a7640bfa RK |
433 | break; |
434 | ||
435 | case POWER_SUPPLY_PROP_TECHNOLOGY: | |
436 | val->intval = POWER_SUPPLY_TECHNOLOGY_LION; | |
437 | break; | |
438 | ||
d3ab61ec RK |
439 | case POWER_SUPPLY_PROP_ENERGY_NOW: |
440 | case POWER_SUPPLY_PROP_ENERGY_FULL: | |
441 | case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: | |
51d07566 RK |
442 | case POWER_SUPPLY_PROP_CHARGE_NOW: |
443 | case POWER_SUPPLY_PROP_CHARGE_FULL: | |
444 | case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: | |
a7640bfa | 445 | case POWER_SUPPLY_PROP_CAPACITY: |
bb879101 RK |
446 | ret = bq20z75_get_property_index(client, psp); |
447 | if (ret < 0) | |
448 | break; | |
d3ab61ec | 449 | |
bb879101 | 450 | ret = bq20z75_get_battery_capacity(client, ret, psp, val); |
d3ab61ec RK |
451 | break; |
452 | ||
453 | case POWER_SUPPLY_PROP_SERIAL_NUMBER: | |
454 | ret = bq20z75_get_battery_serial_number(client, val); | |
a7640bfa RK |
455 | break; |
456 | ||
457 | case POWER_SUPPLY_PROP_STATUS: | |
458 | case POWER_SUPPLY_PROP_CYCLE_COUNT: | |
459 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
460 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
461 | case POWER_SUPPLY_PROP_TEMP: | |
462 | case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG: | |
463 | case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG: | |
d3ab61ec | 464 | case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: |
bb879101 RK |
465 | ret = bq20z75_get_property_index(client, psp); |
466 | if (ret < 0) | |
467 | break; | |
d3ab61ec | 468 | |
bb879101 | 469 | ret = bq20z75_get_battery_property(client, ret, psp, val); |
a7640bfa RK |
470 | break; |
471 | ||
472 | default: | |
473 | dev_err(&client->dev, | |
474 | "%s: INVALID property\n", __func__); | |
475 | return -EINVAL; | |
476 | } | |
477 | ||
bb879101 RK |
478 | if (!bq20z75_device->enable_detection) |
479 | goto done; | |
480 | ||
481 | if (!bq20z75_device->gpio_detect && | |
482 | bq20z75_device->is_present != (ret >= 0)) { | |
483 | bq20z75_device->is_present = (ret >= 0); | |
484 | power_supply_changed(&bq20z75_device->power_supply); | |
485 | } | |
486 | ||
487 | done: | |
488 | if (!ret) { | |
489 | /* Convert units to match requirements for power supply class */ | |
490 | bq20z75_unit_adjustment(client, psp, val); | |
491 | } | |
d3ab61ec | 492 | |
a7640bfa RK |
493 | dev_dbg(&client->dev, |
494 | "%s: property = %d, value = %d\n", __func__, psp, val->intval); | |
495 | ||
bb879101 | 496 | return ret; |
a7640bfa RK |
497 | } |
498 | ||
bb879101 RK |
499 | static irqreturn_t bq20z75_irq(int irq, void *devid) |
500 | { | |
501 | struct power_supply *battery = devid; | |
502 | ||
503 | power_supply_changed(battery); | |
504 | ||
505 | return IRQ_HANDLED; | |
506 | } | |
507 | ||
508 | static int __devinit bq20z75_probe(struct i2c_client *client, | |
a7640bfa RK |
509 | const struct i2c_device_id *id) |
510 | { | |
511 | struct bq20z75_info *bq20z75_device; | |
bb879101 | 512 | struct bq20z75_platform_data *pdata = client->dev.platform_data; |
a7640bfa | 513 | int rc; |
bb879101 | 514 | int irq; |
a7640bfa RK |
515 | |
516 | bq20z75_device = kzalloc(sizeof(struct bq20z75_info), GFP_KERNEL); | |
517 | if (!bq20z75_device) | |
518 | return -ENOMEM; | |
519 | ||
520 | bq20z75_device->client = client; | |
bb879101 RK |
521 | bq20z75_device->enable_detection = false; |
522 | bq20z75_device->gpio_detect = false; | |
a7640bfa RK |
523 | bq20z75_device->power_supply.name = "battery"; |
524 | bq20z75_device->power_supply.type = POWER_SUPPLY_TYPE_BATTERY; | |
525 | bq20z75_device->power_supply.properties = bq20z75_properties; | |
526 | bq20z75_device->power_supply.num_properties = | |
527 | ARRAY_SIZE(bq20z75_properties); | |
528 | bq20z75_device->power_supply.get_property = bq20z75_get_property; | |
529 | ||
bb879101 RK |
530 | if (pdata) { |
531 | bq20z75_device->gpio_detect = | |
532 | gpio_is_valid(pdata->battery_detect); | |
533 | bq20z75_device->pdata = pdata; | |
534 | } | |
535 | ||
a7640bfa RK |
536 | i2c_set_clientdata(client, bq20z75_device); |
537 | ||
bb879101 RK |
538 | if (!bq20z75_device->gpio_detect) |
539 | goto skip_gpio; | |
540 | ||
541 | rc = gpio_request(pdata->battery_detect, dev_name(&client->dev)); | |
542 | if (rc) { | |
543 | dev_warn(&client->dev, "Failed to request gpio: %d\n", rc); | |
544 | bq20z75_device->gpio_detect = false; | |
545 | goto skip_gpio; | |
546 | } | |
547 | ||
548 | rc = gpio_direction_input(pdata->battery_detect); | |
549 | if (rc) { | |
550 | dev_warn(&client->dev, "Failed to get gpio as input: %d\n", rc); | |
551 | gpio_free(pdata->battery_detect); | |
552 | bq20z75_device->gpio_detect = false; | |
553 | goto skip_gpio; | |
554 | } | |
555 | ||
556 | irq = gpio_to_irq(pdata->battery_detect); | |
557 | if (irq <= 0) { | |
558 | dev_warn(&client->dev, "Failed to get gpio as irq: %d\n", irq); | |
559 | gpio_free(pdata->battery_detect); | |
560 | bq20z75_device->gpio_detect = false; | |
561 | goto skip_gpio; | |
562 | } | |
563 | ||
564 | rc = request_irq(irq, bq20z75_irq, | |
565 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, | |
566 | dev_name(&client->dev), &bq20z75_device->power_supply); | |
567 | if (rc) { | |
568 | dev_warn(&client->dev, "Failed to request irq: %d\n", rc); | |
569 | gpio_free(pdata->battery_detect); | |
570 | bq20z75_device->gpio_detect = false; | |
571 | goto skip_gpio; | |
572 | } | |
573 | ||
574 | bq20z75_device->irq = irq; | |
575 | ||
576 | skip_gpio: | |
577 | ||
a7640bfa RK |
578 | rc = power_supply_register(&client->dev, &bq20z75_device->power_supply); |
579 | if (rc) { | |
580 | dev_err(&client->dev, | |
581 | "%s: Failed to register power supply\n", __func__); | |
bb879101 | 582 | goto exit_psupply; |
a7640bfa RK |
583 | } |
584 | ||
585 | dev_info(&client->dev, | |
586 | "%s: battery gas gauge device registered\n", client->name); | |
587 | ||
588 | return 0; | |
bb879101 RK |
589 | |
590 | exit_psupply: | |
591 | if (bq20z75_device->irq) | |
592 | free_irq(bq20z75_device->irq, &bq20z75_device->power_supply); | |
593 | if (bq20z75_device->gpio_detect) | |
594 | gpio_free(pdata->battery_detect); | |
595 | ||
596 | kfree(bq20z75_device); | |
597 | ||
598 | return rc; | |
a7640bfa RK |
599 | } |
600 | ||
bb879101 | 601 | static int __devexit bq20z75_remove(struct i2c_client *client) |
a7640bfa RK |
602 | { |
603 | struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client); | |
604 | ||
bb879101 RK |
605 | if (bq20z75_device->irq) |
606 | free_irq(bq20z75_device->irq, &bq20z75_device->power_supply); | |
607 | if (bq20z75_device->gpio_detect) | |
608 | gpio_free(bq20z75_device->pdata->battery_detect); | |
609 | ||
a7640bfa RK |
610 | power_supply_unregister(&bq20z75_device->power_supply); |
611 | kfree(bq20z75_device); | |
612 | bq20z75_device = NULL; | |
613 | ||
614 | return 0; | |
615 | } | |
616 | ||
617 | #if defined CONFIG_PM | |
618 | static int bq20z75_suspend(struct i2c_client *client, | |
619 | pm_message_t state) | |
620 | { | |
621 | s32 ret; | |
622 | ||
623 | /* write to manufacturer access with sleep command */ | |
d3ab61ec | 624 | ret = bq20z75_write_word_data(client, |
a7640bfa RK |
625 | bq20z75_data[REG_MANUFACTURER_DATA].addr, |
626 | MANUFACTURER_ACCESS_SLEEP); | |
d3ab61ec RK |
627 | if (ret < 0) |
628 | return ret; | |
a7640bfa RK |
629 | |
630 | return 0; | |
631 | } | |
632 | #else | |
633 | #define bq20z75_suspend NULL | |
634 | #endif | |
635 | /* any smbus transaction will wake up bq20z75 */ | |
636 | #define bq20z75_resume NULL | |
637 | ||
638 | static const struct i2c_device_id bq20z75_id[] = { | |
639 | { "bq20z75", 0 }, | |
640 | {} | |
641 | }; | |
642 | ||
643 | static struct i2c_driver bq20z75_battery_driver = { | |
644 | .probe = bq20z75_probe, | |
bb879101 | 645 | .remove = __devexit_p(bq20z75_remove), |
a7640bfa RK |
646 | .suspend = bq20z75_suspend, |
647 | .resume = bq20z75_resume, | |
648 | .id_table = bq20z75_id, | |
649 | .driver = { | |
650 | .name = "bq20z75-battery", | |
651 | }, | |
652 | }; | |
653 | ||
654 | static int __init bq20z75_battery_init(void) | |
655 | { | |
656 | return i2c_add_driver(&bq20z75_battery_driver); | |
657 | } | |
658 | module_init(bq20z75_battery_init); | |
659 | ||
660 | static void __exit bq20z75_battery_exit(void) | |
661 | { | |
662 | i2c_del_driver(&bq20z75_battery_driver); | |
663 | } | |
664 | module_exit(bq20z75_battery_exit); | |
665 | ||
666 | MODULE_DESCRIPTION("BQ20z75 battery monitor driver"); | |
667 | MODULE_LICENSE("GPL"); |