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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; | |
58ddafae RK |
155 | int last_state; |
156 | int poll_time; | |
157 | struct delayed_work work; | |
158 | int ignore_changes; | |
a7640bfa RK |
159 | }; |
160 | ||
d3ab61ec RK |
161 | static int bq20z75_read_word_data(struct i2c_client *client, u8 address) |
162 | { | |
ff28fcef RK |
163 | struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client); |
164 | s32 ret = 0; | |
165 | int retries = 1; | |
166 | ||
167 | if (bq20z75_device->pdata) | |
168 | retries = max(bq20z75_device->pdata->i2c_retry_count + 1, 1); | |
169 | ||
170 | while (retries > 0) { | |
171 | ret = i2c_smbus_read_word_data(client, address); | |
172 | if (ret >= 0) | |
173 | break; | |
174 | retries--; | |
175 | } | |
d3ab61ec | 176 | |
d3ab61ec | 177 | if (ret < 0) { |
a7d9ace4 | 178 | dev_dbg(&client->dev, |
d3ab61ec RK |
179 | "%s: i2c read at address 0x%x failed\n", |
180 | __func__, address); | |
181 | return ret; | |
182 | } | |
ff28fcef | 183 | |
d3ab61ec RK |
184 | return le16_to_cpu(ret); |
185 | } | |
186 | ||
187 | static int bq20z75_write_word_data(struct i2c_client *client, u8 address, | |
188 | u16 value) | |
189 | { | |
ff28fcef RK |
190 | struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client); |
191 | s32 ret = 0; | |
192 | int retries = 1; | |
193 | ||
194 | if (bq20z75_device->pdata) | |
195 | retries = max(bq20z75_device->pdata->i2c_retry_count + 1, 1); | |
196 | ||
197 | while (retries > 0) { | |
198 | ret = i2c_smbus_write_word_data(client, address, | |
199 | le16_to_cpu(value)); | |
200 | if (ret >= 0) | |
201 | break; | |
202 | retries--; | |
203 | } | |
d3ab61ec | 204 | |
d3ab61ec | 205 | if (ret < 0) { |
a7d9ace4 | 206 | dev_dbg(&client->dev, |
d3ab61ec RK |
207 | "%s: i2c write to address 0x%x failed\n", |
208 | __func__, address); | |
209 | return ret; | |
210 | } | |
ff28fcef | 211 | |
d3ab61ec RK |
212 | return 0; |
213 | } | |
214 | ||
a7640bfa RK |
215 | static int bq20z75_get_battery_presence_and_health( |
216 | struct i2c_client *client, enum power_supply_property psp, | |
217 | union power_supply_propval *val) | |
218 | { | |
219 | s32 ret; | |
bb879101 RK |
220 | struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client); |
221 | ||
222 | if (psp == POWER_SUPPLY_PROP_PRESENT && | |
223 | bq20z75_device->gpio_detect) { | |
224 | ret = gpio_get_value( | |
225 | bq20z75_device->pdata->battery_detect); | |
226 | if (ret == bq20z75_device->pdata->battery_detect_present) | |
227 | val->intval = 1; | |
228 | else | |
229 | val->intval = 0; | |
a7d9ace4 | 230 | bq20z75_device->is_present = val->intval; |
bb879101 RK |
231 | return ret; |
232 | } | |
a7640bfa RK |
233 | |
234 | /* Write to ManufacturerAccess with | |
235 | * ManufacturerAccess command and then | |
236 | * read the status */ | |
d3ab61ec | 237 | ret = bq20z75_write_word_data(client, |
a7640bfa RK |
238 | bq20z75_data[REG_MANUFACTURER_DATA].addr, |
239 | MANUFACTURER_ACCESS_STATUS); | |
bb879101 RK |
240 | if (ret < 0) { |
241 | if (psp == POWER_SUPPLY_PROP_PRESENT) | |
242 | val->intval = 0; /* battery removed */ | |
d3ab61ec | 243 | return ret; |
bb879101 | 244 | } |
a7640bfa | 245 | |
a7d9ace4 RK |
246 | ret = bq20z75_read_word_data(client, |
247 | bq20z75_data[REG_MANUFACTURER_DATA].addr); | |
248 | if (ret < 0) | |
249 | return ret; | |
250 | ||
a7640bfa RK |
251 | if (ret < bq20z75_data[REG_MANUFACTURER_DATA].min_value || |
252 | ret > bq20z75_data[REG_MANUFACTURER_DATA].max_value) { | |
253 | val->intval = 0; | |
254 | return 0; | |
255 | } | |
256 | ||
257 | /* Mask the upper nibble of 2nd byte and | |
258 | * lower byte of response then | |
259 | * shift the result by 8 to get status*/ | |
260 | ret &= 0x0F00; | |
261 | ret >>= 8; | |
262 | if (psp == POWER_SUPPLY_PROP_PRESENT) { | |
263 | if (ret == 0x0F) | |
264 | /* battery removed */ | |
265 | val->intval = 0; | |
266 | else | |
267 | val->intval = 1; | |
268 | } else if (psp == POWER_SUPPLY_PROP_HEALTH) { | |
269 | if (ret == 0x09) | |
270 | val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; | |
271 | else if (ret == 0x0B) | |
272 | val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; | |
273 | else if (ret == 0x0C) | |
274 | val->intval = POWER_SUPPLY_HEALTH_DEAD; | |
275 | else | |
276 | val->intval = POWER_SUPPLY_HEALTH_GOOD; | |
277 | } | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
282 | static int bq20z75_get_battery_property(struct i2c_client *client, | |
283 | int reg_offset, enum power_supply_property psp, | |
284 | union power_supply_propval *val) | |
285 | { | |
58ddafae | 286 | struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client); |
a7640bfa RK |
287 | s32 ret; |
288 | ||
d3ab61ec | 289 | ret = bq20z75_read_word_data(client, |
a7640bfa | 290 | bq20z75_data[reg_offset].addr); |
d3ab61ec RK |
291 | if (ret < 0) |
292 | return ret; | |
293 | ||
294 | /* returned values are 16 bit */ | |
295 | if (bq20z75_data[reg_offset].min_value < 0) | |
296 | ret = (s16)ret; | |
a7640bfa RK |
297 | |
298 | if (ret >= bq20z75_data[reg_offset].min_value && | |
299 | ret <= bq20z75_data[reg_offset].max_value) { | |
300 | val->intval = ret; | |
58ddafae RK |
301 | if (psp != POWER_SUPPLY_PROP_STATUS) |
302 | return 0; | |
303 | ||
304 | if (ret & BATTERY_FULL_CHARGED) | |
305 | val->intval = POWER_SUPPLY_STATUS_FULL; | |
306 | else if (ret & BATTERY_FULL_DISCHARGED) | |
307 | val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
308 | else if (ret & BATTERY_DISCHARGING) | |
309 | val->intval = POWER_SUPPLY_STATUS_DISCHARGING; | |
310 | else | |
311 | val->intval = POWER_SUPPLY_STATUS_CHARGING; | |
312 | ||
313 | if (bq20z75_device->poll_time == 0) | |
314 | bq20z75_device->last_state = val->intval; | |
315 | else if (bq20z75_device->last_state != val->intval) { | |
316 | cancel_delayed_work_sync(&bq20z75_device->work); | |
317 | power_supply_changed(&bq20z75_device->power_supply); | |
318 | bq20z75_device->poll_time = 0; | |
a7640bfa | 319 | } |
a7640bfa RK |
320 | } else { |
321 | if (psp == POWER_SUPPLY_PROP_STATUS) | |
322 | val->intval = POWER_SUPPLY_STATUS_UNKNOWN; | |
323 | else | |
324 | val->intval = 0; | |
325 | } | |
326 | ||
327 | return 0; | |
328 | } | |
329 | ||
d3ab61ec RK |
330 | static void bq20z75_unit_adjustment(struct i2c_client *client, |
331 | enum power_supply_property psp, union power_supply_propval *val) | |
332 | { | |
333 | #define BASE_UNIT_CONVERSION 1000 | |
334 | #define BATTERY_MODE_CAP_MULT_WATT (10 * BASE_UNIT_CONVERSION) | |
909a78b3 BL |
335 | #define TIME_UNIT_CONVERSION 60 |
336 | #define TEMP_KELVIN_TO_CELSIUS 2731 | |
d3ab61ec RK |
337 | switch (psp) { |
338 | case POWER_SUPPLY_PROP_ENERGY_NOW: | |
339 | case POWER_SUPPLY_PROP_ENERGY_FULL: | |
340 | case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: | |
909a78b3 BL |
341 | /* bq20z75 provides energy in units of 10mWh. |
342 | * Convert to µWh | |
343 | */ | |
d3ab61ec RK |
344 | val->intval *= BATTERY_MODE_CAP_MULT_WATT; |
345 | break; | |
346 | ||
347 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
348 | case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: | |
349 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
51d07566 RK |
350 | case POWER_SUPPLY_PROP_CHARGE_NOW: |
351 | case POWER_SUPPLY_PROP_CHARGE_FULL: | |
352 | case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: | |
d3ab61ec RK |
353 | val->intval *= BASE_UNIT_CONVERSION; |
354 | break; | |
355 | ||
356 | case POWER_SUPPLY_PROP_TEMP: | |
909a78b3 BL |
357 | /* bq20z75 provides battery temperature in 0.1K |
358 | * so convert it to 0.1°C | |
359 | */ | |
360 | val->intval -= TEMP_KELVIN_TO_CELSIUS; | |
d3ab61ec RK |
361 | break; |
362 | ||
363 | case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG: | |
364 | case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG: | |
909a78b3 BL |
365 | /* bq20z75 provides time to empty and time to full in minutes. |
366 | * Convert to seconds | |
367 | */ | |
d3ab61ec RK |
368 | val->intval *= TIME_UNIT_CONVERSION; |
369 | break; | |
370 | ||
371 | default: | |
372 | dev_dbg(&client->dev, | |
373 | "%s: no need for unit conversion %d\n", __func__, psp); | |
374 | } | |
375 | } | |
376 | ||
51d07566 RK |
377 | static enum bq20z75_battery_mode |
378 | bq20z75_set_battery_mode(struct i2c_client *client, | |
379 | enum bq20z75_battery_mode mode) | |
380 | { | |
381 | int ret, original_val; | |
382 | ||
383 | original_val = bq20z75_read_word_data(client, BATTERY_MODE_OFFSET); | |
384 | if (original_val < 0) | |
385 | return original_val; | |
386 | ||
387 | if ((original_val & BATTERY_MODE_MASK) == mode) | |
388 | return mode; | |
389 | ||
390 | if (mode == BATTERY_MODE_AMPS) | |
391 | ret = original_val & ~BATTERY_MODE_MASK; | |
392 | else | |
393 | ret = original_val | BATTERY_MODE_MASK; | |
394 | ||
395 | ret = bq20z75_write_word_data(client, BATTERY_MODE_OFFSET, ret); | |
396 | if (ret < 0) | |
397 | return ret; | |
398 | ||
399 | return original_val & BATTERY_MODE_MASK; | |
400 | } | |
401 | ||
a7640bfa | 402 | static int bq20z75_get_battery_capacity(struct i2c_client *client, |
d3ab61ec | 403 | int reg_offset, enum power_supply_property psp, |
a7640bfa RK |
404 | union power_supply_propval *val) |
405 | { | |
406 | s32 ret; | |
51d07566 RK |
407 | enum bq20z75_battery_mode mode = BATTERY_MODE_WATTS; |
408 | ||
409 | if (power_supply_is_amp_property(psp)) | |
410 | mode = BATTERY_MODE_AMPS; | |
411 | ||
412 | mode = bq20z75_set_battery_mode(client, mode); | |
413 | if (mode < 0) | |
414 | return mode; | |
a7640bfa | 415 | |
d3ab61ec RK |
416 | ret = bq20z75_read_word_data(client, bq20z75_data[reg_offset].addr); |
417 | if (ret < 0) | |
418 | return ret; | |
a7640bfa | 419 | |
d3ab61ec RK |
420 | if (psp == POWER_SUPPLY_PROP_CAPACITY) { |
421 | /* bq20z75 spec says that this can be >100 % | |
422 | * even if max value is 100 % */ | |
423 | val->intval = min(ret, 100); | |
424 | } else | |
425 | val->intval = ret; | |
426 | ||
51d07566 RK |
427 | ret = bq20z75_set_battery_mode(client, mode); |
428 | if (ret < 0) | |
429 | return ret; | |
430 | ||
d3ab61ec RK |
431 | return 0; |
432 | } | |
433 | ||
434 | static char bq20z75_serial[5]; | |
435 | static int bq20z75_get_battery_serial_number(struct i2c_client *client, | |
436 | union power_supply_propval *val) | |
437 | { | |
438 | int ret; | |
439 | ||
440 | ret = bq20z75_read_word_data(client, | |
441 | bq20z75_data[REG_SERIAL_NUMBER].addr); | |
442 | if (ret < 0) | |
443 | return ret; | |
444 | ||
445 | ret = sprintf(bq20z75_serial, "%04x", ret); | |
446 | val->strval = bq20z75_serial; | |
a7640bfa RK |
447 | |
448 | return 0; | |
449 | } | |
450 | ||
51d07566 RK |
451 | static int bq20z75_get_property_index(struct i2c_client *client, |
452 | enum power_supply_property psp) | |
453 | { | |
454 | int count; | |
455 | for (count = 0; count < ARRAY_SIZE(bq20z75_data); count++) | |
456 | if (psp == bq20z75_data[count].psp) | |
457 | return count; | |
458 | ||
459 | dev_warn(&client->dev, | |
460 | "%s: Invalid Property - %d\n", __func__, psp); | |
461 | ||
462 | return -EINVAL; | |
463 | } | |
464 | ||
a7640bfa RK |
465 | static int bq20z75_get_property(struct power_supply *psy, |
466 | enum power_supply_property psp, | |
467 | union power_supply_propval *val) | |
468 | { | |
bb879101 | 469 | int ret = 0; |
a7640bfa RK |
470 | struct bq20z75_info *bq20z75_device = container_of(psy, |
471 | struct bq20z75_info, power_supply); | |
472 | struct i2c_client *client = bq20z75_device->client; | |
473 | ||
474 | switch (psp) { | |
475 | case POWER_SUPPLY_PROP_PRESENT: | |
476 | case POWER_SUPPLY_PROP_HEALTH: | |
477 | ret = bq20z75_get_battery_presence_and_health(client, psp, val); | |
a7d9ace4 RK |
478 | if (psp == POWER_SUPPLY_PROP_PRESENT) |
479 | return 0; | |
a7640bfa RK |
480 | break; |
481 | ||
482 | case POWER_SUPPLY_PROP_TECHNOLOGY: | |
483 | val->intval = POWER_SUPPLY_TECHNOLOGY_LION; | |
484 | break; | |
485 | ||
d3ab61ec RK |
486 | case POWER_SUPPLY_PROP_ENERGY_NOW: |
487 | case POWER_SUPPLY_PROP_ENERGY_FULL: | |
488 | case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: | |
51d07566 RK |
489 | case POWER_SUPPLY_PROP_CHARGE_NOW: |
490 | case POWER_SUPPLY_PROP_CHARGE_FULL: | |
491 | case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: | |
a7640bfa | 492 | case POWER_SUPPLY_PROP_CAPACITY: |
bb879101 RK |
493 | ret = bq20z75_get_property_index(client, psp); |
494 | if (ret < 0) | |
495 | break; | |
d3ab61ec | 496 | |
bb879101 | 497 | ret = bq20z75_get_battery_capacity(client, ret, psp, val); |
d3ab61ec RK |
498 | break; |
499 | ||
500 | case POWER_SUPPLY_PROP_SERIAL_NUMBER: | |
501 | ret = bq20z75_get_battery_serial_number(client, val); | |
a7640bfa RK |
502 | break; |
503 | ||
504 | case POWER_SUPPLY_PROP_STATUS: | |
505 | case POWER_SUPPLY_PROP_CYCLE_COUNT: | |
506 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
507 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
508 | case POWER_SUPPLY_PROP_TEMP: | |
509 | case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG: | |
510 | case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG: | |
d3ab61ec | 511 | case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: |
bb879101 RK |
512 | ret = bq20z75_get_property_index(client, psp); |
513 | if (ret < 0) | |
514 | break; | |
d3ab61ec | 515 | |
bb879101 | 516 | ret = bq20z75_get_battery_property(client, ret, psp, val); |
a7640bfa RK |
517 | break; |
518 | ||
519 | default: | |
520 | dev_err(&client->dev, | |
521 | "%s: INVALID property\n", __func__); | |
522 | return -EINVAL; | |
523 | } | |
524 | ||
bb879101 RK |
525 | if (!bq20z75_device->enable_detection) |
526 | goto done; | |
527 | ||
528 | if (!bq20z75_device->gpio_detect && | |
529 | bq20z75_device->is_present != (ret >= 0)) { | |
530 | bq20z75_device->is_present = (ret >= 0); | |
531 | power_supply_changed(&bq20z75_device->power_supply); | |
532 | } | |
533 | ||
534 | done: | |
535 | if (!ret) { | |
536 | /* Convert units to match requirements for power supply class */ | |
537 | bq20z75_unit_adjustment(client, psp, val); | |
538 | } | |
d3ab61ec | 539 | |
a7640bfa | 540 | dev_dbg(&client->dev, |
a7d9ace4 RK |
541 | "%s: property = %d, value = %x\n", __func__, psp, val->intval); |
542 | ||
543 | if (ret && bq20z75_device->is_present) | |
544 | return ret; | |
545 | ||
546 | /* battery not present, so return NODATA for properties */ | |
547 | if (ret) | |
548 | return -ENODATA; | |
a7640bfa | 549 | |
a7d9ace4 | 550 | return 0; |
a7640bfa RK |
551 | } |
552 | ||
bb879101 RK |
553 | static irqreturn_t bq20z75_irq(int irq, void *devid) |
554 | { | |
555 | struct power_supply *battery = devid; | |
556 | ||
557 | power_supply_changed(battery); | |
558 | ||
559 | return IRQ_HANDLED; | |
560 | } | |
561 | ||
58ddafae RK |
562 | static void bq20z75_external_power_changed(struct power_supply *psy) |
563 | { | |
564 | struct bq20z75_info *bq20z75_device; | |
565 | ||
566 | bq20z75_device = container_of(psy, struct bq20z75_info, power_supply); | |
567 | ||
568 | if (bq20z75_device->ignore_changes > 0) { | |
569 | bq20z75_device->ignore_changes--; | |
570 | return; | |
571 | } | |
572 | ||
573 | /* cancel outstanding work */ | |
574 | cancel_delayed_work_sync(&bq20z75_device->work); | |
575 | ||
576 | schedule_delayed_work(&bq20z75_device->work, HZ); | |
577 | bq20z75_device->poll_time = bq20z75_device->pdata->poll_retry_count; | |
578 | } | |
579 | ||
580 | static void bq20z75_delayed_work(struct work_struct *work) | |
581 | { | |
582 | struct bq20z75_info *bq20z75_device; | |
583 | s32 ret; | |
584 | ||
585 | bq20z75_device = container_of(work, struct bq20z75_info, work.work); | |
586 | ||
587 | ret = bq20z75_read_word_data(bq20z75_device->client, | |
588 | bq20z75_data[REG_STATUS].addr); | |
589 | /* if the read failed, give up on this work */ | |
590 | if (ret < 0) { | |
591 | bq20z75_device->poll_time = 0; | |
592 | return; | |
593 | } | |
594 | ||
595 | if (ret & BATTERY_FULL_CHARGED) | |
596 | ret = POWER_SUPPLY_STATUS_FULL; | |
597 | else if (ret & BATTERY_FULL_DISCHARGED) | |
598 | ret = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
599 | else if (ret & BATTERY_DISCHARGING) | |
600 | ret = POWER_SUPPLY_STATUS_DISCHARGING; | |
601 | else | |
602 | ret = POWER_SUPPLY_STATUS_CHARGING; | |
603 | ||
604 | if (bq20z75_device->last_state != ret) { | |
605 | bq20z75_device->poll_time = 0; | |
606 | power_supply_changed(&bq20z75_device->power_supply); | |
607 | return; | |
608 | } | |
609 | if (bq20z75_device->poll_time > 0) { | |
610 | schedule_delayed_work(&bq20z75_device->work, HZ); | |
611 | bq20z75_device->poll_time--; | |
612 | return; | |
613 | } | |
614 | } | |
615 | ||
bb879101 | 616 | static int __devinit bq20z75_probe(struct i2c_client *client, |
a7640bfa RK |
617 | const struct i2c_device_id *id) |
618 | { | |
619 | struct bq20z75_info *bq20z75_device; | |
bb879101 | 620 | struct bq20z75_platform_data *pdata = client->dev.platform_data; |
a7640bfa | 621 | int rc; |
bb879101 | 622 | int irq; |
a7640bfa RK |
623 | |
624 | bq20z75_device = kzalloc(sizeof(struct bq20z75_info), GFP_KERNEL); | |
625 | if (!bq20z75_device) | |
626 | return -ENOMEM; | |
627 | ||
628 | bq20z75_device->client = client; | |
bb879101 RK |
629 | bq20z75_device->enable_detection = false; |
630 | bq20z75_device->gpio_detect = false; | |
a7640bfa RK |
631 | bq20z75_device->power_supply.name = "battery"; |
632 | bq20z75_device->power_supply.type = POWER_SUPPLY_TYPE_BATTERY; | |
633 | bq20z75_device->power_supply.properties = bq20z75_properties; | |
634 | bq20z75_device->power_supply.num_properties = | |
635 | ARRAY_SIZE(bq20z75_properties); | |
636 | bq20z75_device->power_supply.get_property = bq20z75_get_property; | |
58ddafae RK |
637 | /* ignore first notification of external change, it is generated |
638 | * from the power_supply_register call back | |
639 | */ | |
640 | bq20z75_device->ignore_changes = 1; | |
641 | bq20z75_device->last_state = POWER_SUPPLY_STATUS_UNKNOWN; | |
642 | bq20z75_device->power_supply.external_power_changed = | |
643 | bq20z75_external_power_changed; | |
a7640bfa | 644 | |
bb879101 RK |
645 | if (pdata) { |
646 | bq20z75_device->gpio_detect = | |
647 | gpio_is_valid(pdata->battery_detect); | |
648 | bq20z75_device->pdata = pdata; | |
649 | } | |
650 | ||
a7640bfa RK |
651 | i2c_set_clientdata(client, bq20z75_device); |
652 | ||
bb879101 RK |
653 | if (!bq20z75_device->gpio_detect) |
654 | goto skip_gpio; | |
655 | ||
656 | rc = gpio_request(pdata->battery_detect, dev_name(&client->dev)); | |
657 | if (rc) { | |
658 | dev_warn(&client->dev, "Failed to request gpio: %d\n", rc); | |
659 | bq20z75_device->gpio_detect = false; | |
660 | goto skip_gpio; | |
661 | } | |
662 | ||
663 | rc = gpio_direction_input(pdata->battery_detect); | |
664 | if (rc) { | |
665 | dev_warn(&client->dev, "Failed to get gpio as input: %d\n", rc); | |
666 | gpio_free(pdata->battery_detect); | |
667 | bq20z75_device->gpio_detect = false; | |
668 | goto skip_gpio; | |
669 | } | |
670 | ||
671 | irq = gpio_to_irq(pdata->battery_detect); | |
672 | if (irq <= 0) { | |
673 | dev_warn(&client->dev, "Failed to get gpio as irq: %d\n", irq); | |
674 | gpio_free(pdata->battery_detect); | |
675 | bq20z75_device->gpio_detect = false; | |
676 | goto skip_gpio; | |
677 | } | |
678 | ||
679 | rc = request_irq(irq, bq20z75_irq, | |
680 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, | |
681 | dev_name(&client->dev), &bq20z75_device->power_supply); | |
682 | if (rc) { | |
683 | dev_warn(&client->dev, "Failed to request irq: %d\n", rc); | |
684 | gpio_free(pdata->battery_detect); | |
685 | bq20z75_device->gpio_detect = false; | |
686 | goto skip_gpio; | |
687 | } | |
688 | ||
689 | bq20z75_device->irq = irq; | |
690 | ||
691 | skip_gpio: | |
692 | ||
a7640bfa RK |
693 | rc = power_supply_register(&client->dev, &bq20z75_device->power_supply); |
694 | if (rc) { | |
695 | dev_err(&client->dev, | |
696 | "%s: Failed to register power supply\n", __func__); | |
bb879101 | 697 | goto exit_psupply; |
a7640bfa RK |
698 | } |
699 | ||
700 | dev_info(&client->dev, | |
701 | "%s: battery gas gauge device registered\n", client->name); | |
702 | ||
58ddafae RK |
703 | INIT_DELAYED_WORK(&bq20z75_device->work, bq20z75_delayed_work); |
704 | ||
ee177d96 RK |
705 | bq20z75_device->enable_detection = true; |
706 | ||
a7640bfa | 707 | return 0; |
bb879101 RK |
708 | |
709 | exit_psupply: | |
710 | if (bq20z75_device->irq) | |
711 | free_irq(bq20z75_device->irq, &bq20z75_device->power_supply); | |
712 | if (bq20z75_device->gpio_detect) | |
713 | gpio_free(pdata->battery_detect); | |
714 | ||
715 | kfree(bq20z75_device); | |
716 | ||
717 | return rc; | |
a7640bfa RK |
718 | } |
719 | ||
bb879101 | 720 | static int __devexit bq20z75_remove(struct i2c_client *client) |
a7640bfa RK |
721 | { |
722 | struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client); | |
723 | ||
bb879101 RK |
724 | if (bq20z75_device->irq) |
725 | free_irq(bq20z75_device->irq, &bq20z75_device->power_supply); | |
726 | if (bq20z75_device->gpio_detect) | |
727 | gpio_free(bq20z75_device->pdata->battery_detect); | |
728 | ||
a7640bfa | 729 | power_supply_unregister(&bq20z75_device->power_supply); |
58ddafae RK |
730 | |
731 | cancel_delayed_work_sync(&bq20z75_device->work); | |
732 | ||
a7640bfa RK |
733 | kfree(bq20z75_device); |
734 | bq20z75_device = NULL; | |
735 | ||
736 | return 0; | |
737 | } | |
738 | ||
739 | #if defined CONFIG_PM | |
740 | static int bq20z75_suspend(struct i2c_client *client, | |
741 | pm_message_t state) | |
742 | { | |
a7d9ace4 | 743 | struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client); |
a7640bfa RK |
744 | s32 ret; |
745 | ||
58ddafae RK |
746 | if (bq20z75_device->poll_time > 0) |
747 | cancel_delayed_work_sync(&bq20z75_device->work); | |
748 | ||
a7640bfa | 749 | /* write to manufacturer access with sleep command */ |
d3ab61ec | 750 | ret = bq20z75_write_word_data(client, |
a7640bfa RK |
751 | bq20z75_data[REG_MANUFACTURER_DATA].addr, |
752 | MANUFACTURER_ACCESS_SLEEP); | |
a7d9ace4 | 753 | if (bq20z75_device->is_present && ret < 0) |
d3ab61ec | 754 | return ret; |
a7640bfa RK |
755 | |
756 | return 0; | |
757 | } | |
758 | #else | |
759 | #define bq20z75_suspend NULL | |
760 | #endif | |
761 | /* any smbus transaction will wake up bq20z75 */ | |
762 | #define bq20z75_resume NULL | |
763 | ||
764 | static const struct i2c_device_id bq20z75_id[] = { | |
765 | { "bq20z75", 0 }, | |
766 | {} | |
767 | }; | |
f3da0dee | 768 | MODULE_DEVICE_TABLE(i2c, bq20z75_id); |
a7640bfa RK |
769 | |
770 | static struct i2c_driver bq20z75_battery_driver = { | |
771 | .probe = bq20z75_probe, | |
bb879101 | 772 | .remove = __devexit_p(bq20z75_remove), |
a7640bfa RK |
773 | .suspend = bq20z75_suspend, |
774 | .resume = bq20z75_resume, | |
775 | .id_table = bq20z75_id, | |
776 | .driver = { | |
777 | .name = "bq20z75-battery", | |
778 | }, | |
779 | }; | |
780 | ||
781 | static int __init bq20z75_battery_init(void) | |
782 | { | |
783 | return i2c_add_driver(&bq20z75_battery_driver); | |
784 | } | |
785 | module_init(bq20z75_battery_init); | |
786 | ||
787 | static void __exit bq20z75_battery_exit(void) | |
788 | { | |
789 | i2c_del_driver(&bq20z75_battery_driver); | |
790 | } | |
791 | module_exit(bq20z75_battery_exit); | |
792 | ||
793 | MODULE_DESCRIPTION("BQ20z75 battery monitor driver"); | |
794 | MODULE_LICENSE("GPL"); |