Commit | Line | Data |
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b996ad0e RG |
1 | /* |
2 | * BQ27x00 battery driver | |
3 | * | |
4 | * Copyright (C) 2008 Rodolfo Giometti <giometti@linux.it> | |
5 | * Copyright (C) 2008 Eurotech S.p.A. <info@eurotech.it> | |
7fb7ba58 | 6 | * Copyright (C) 2010-2011 Lars-Peter Clausen <lars@metafoo.de> |
b996ad0e RG |
7 | * |
8 | * Based on a previous work by Copyright (C) 2008 Texas Instruments, Inc. | |
9 | * | |
10 | * This package is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | * | |
14 | * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
15 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
16 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
17 | * | |
18 | */ | |
631c17ee PR |
19 | |
20 | /* | |
21 | * Datasheets: | |
22 | * http://focus.ti.com/docs/prod/folders/print/bq27000.html | |
23 | * http://focus.ti.com/docs/prod/folders/print/bq27500.html | |
24 | */ | |
25 | ||
b996ad0e RG |
26 | #include <linux/module.h> |
27 | #include <linux/param.h> | |
28 | #include <linux/jiffies.h> | |
29 | #include <linux/workqueue.h> | |
30 | #include <linux/delay.h> | |
31 | #include <linux/platform_device.h> | |
32 | #include <linux/power_supply.h> | |
33 | #include <linux/idr.h> | |
b996ad0e | 34 | #include <linux/i2c.h> |
5a0e3ad6 | 35 | #include <linux/slab.h> |
8aef7e8f | 36 | #include <asm/unaligned.h> |
b996ad0e | 37 | |
7fb7ba58 LPC |
38 | #include <linux/power/bq27x00_battery.h> |
39 | ||
631c17ee | 40 | #define DRIVER_VERSION "1.2.0" |
b996ad0e RG |
41 | |
42 | #define BQ27x00_REG_TEMP 0x06 | |
43 | #define BQ27x00_REG_VOLT 0x08 | |
b996ad0e RG |
44 | #define BQ27x00_REG_AI 0x14 |
45 | #define BQ27x00_REG_FLAGS 0x0A | |
4e924a81 GI |
46 | #define BQ27x00_REG_TTE 0x16 |
47 | #define BQ27x00_REG_TTF 0x18 | |
48 | #define BQ27x00_REG_TTECP 0x26 | |
631c17ee PR |
49 | #define BQ27x00_REG_NAC 0x0C /* Nominal available capaciy */ |
50 | #define BQ27x00_REG_LMD 0x12 /* Last measured discharge */ | |
51 | #define BQ27x00_REG_CYCT 0x2A /* Cycle count total */ | |
52 | #define BQ27x00_REG_AE 0x22 /* Available enery */ | |
b996ad0e | 53 | |
e20908d9 | 54 | #define BQ27000_REG_RSOC 0x0B /* Relative State-of-Charge */ |
631c17ee | 55 | #define BQ27000_REG_ILMD 0x76 /* Initial last measured discharge */ |
4e924a81 | 56 | #define BQ27000_FLAG_CHGS BIT(7) |
e20908d9 GI |
57 | |
58 | #define BQ27500_REG_SOC 0x2c | |
631c17ee | 59 | #define BQ27500_REG_DCAP 0x3C /* Design capacity */ |
4e924a81 GI |
60 | #define BQ27500_FLAG_DSC BIT(0) |
61 | #define BQ27500_FLAG_FC BIT(9) | |
e20908d9 | 62 | |
a2e5118c PR |
63 | #define BQ27000_RS 20 /* Resistor sense */ |
64 | ||
b996ad0e RG |
65 | struct bq27x00_device_info; |
66 | struct bq27x00_access_methods { | |
297a533b | 67 | int (*read)(struct bq27x00_device_info *di, u8 reg, bool single); |
b996ad0e RG |
68 | }; |
69 | ||
e20908d9 GI |
70 | enum bq27x00_chip { BQ27000, BQ27500 }; |
71 | ||
297a533b LPC |
72 | struct bq27x00_reg_cache { |
73 | int temperature; | |
74 | int time_to_empty; | |
75 | int time_to_empty_avg; | |
76 | int time_to_full; | |
631c17ee PR |
77 | int charge_full; |
78 | int charge_counter; | |
297a533b LPC |
79 | int capacity; |
80 | int flags; | |
81 | ||
82 | int current_now; | |
83 | }; | |
84 | ||
b996ad0e RG |
85 | struct bq27x00_device_info { |
86 | struct device *dev; | |
87 | int id; | |
e20908d9 | 88 | enum bq27x00_chip chip; |
b996ad0e | 89 | |
297a533b | 90 | struct bq27x00_reg_cache cache; |
631c17ee PR |
91 | int charge_design_full; |
92 | ||
297a533b | 93 | unsigned long last_update; |
740b755a | 94 | struct delayed_work work; |
297a533b | 95 | |
a40402ef LPC |
96 | struct power_supply bat; |
97 | ||
98 | struct bq27x00_access_methods bus; | |
740b755a LPC |
99 | |
100 | struct mutex lock; | |
b996ad0e RG |
101 | }; |
102 | ||
103 | static enum power_supply_property bq27x00_battery_props[] = { | |
4e924a81 | 104 | POWER_SUPPLY_PROP_STATUS, |
b996ad0e RG |
105 | POWER_SUPPLY_PROP_PRESENT, |
106 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
107 | POWER_SUPPLY_PROP_CURRENT_NOW, | |
108 | POWER_SUPPLY_PROP_CAPACITY, | |
109 | POWER_SUPPLY_PROP_TEMP, | |
4e924a81 GI |
110 | POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW, |
111 | POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, | |
112 | POWER_SUPPLY_PROP_TIME_TO_FULL_NOW, | |
5661f334 | 113 | POWER_SUPPLY_PROP_TECHNOLOGY, |
631c17ee PR |
114 | POWER_SUPPLY_PROP_CHARGE_FULL, |
115 | POWER_SUPPLY_PROP_CHARGE_NOW, | |
116 | POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, | |
117 | POWER_SUPPLY_PROP_CHARGE_COUNTER, | |
118 | POWER_SUPPLY_PROP_ENERGY_NOW, | |
b996ad0e RG |
119 | }; |
120 | ||
740b755a LPC |
121 | static unsigned int poll_interval = 360; |
122 | module_param(poll_interval, uint, 0644); | |
123 | MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \ | |
124 | "0 disables polling"); | |
125 | ||
b996ad0e RG |
126 | /* |
127 | * Common code for BQ27x00 devices | |
128 | */ | |
129 | ||
a40402ef | 130 | static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg, |
297a533b | 131 | bool single) |
b996ad0e | 132 | { |
297a533b | 133 | return di->bus.read(di, reg, single); |
b996ad0e RG |
134 | } |
135 | ||
136 | /* | |
297a533b | 137 | * Return the battery Relative State-of-Charge |
b996ad0e RG |
138 | * Or < 0 if something fails. |
139 | */ | |
297a533b | 140 | static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di) |
b996ad0e | 141 | { |
297a533b | 142 | int rsoc; |
b996ad0e | 143 | |
e20908d9 | 144 | if (di->chip == BQ27500) |
297a533b | 145 | rsoc = bq27x00_read(di, BQ27500_REG_SOC, false); |
e20908d9 | 146 | else |
297a533b LPC |
147 | rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true); |
148 | ||
149 | if (rsoc < 0) | |
150 | dev_err(di->dev, "error reading relative State-of-Charge\n"); | |
151 | ||
152 | return rsoc; | |
b996ad0e RG |
153 | } |
154 | ||
631c17ee PR |
155 | /* |
156 | * Return a battery charge value in µAh | |
157 | * Or < 0 if something fails. | |
158 | */ | |
159 | static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg) | |
160 | { | |
161 | int charge; | |
162 | ||
163 | charge = bq27x00_read(di, reg, false); | |
164 | if (charge < 0) { | |
165 | dev_err(di->dev, "error reading nominal available capacity\n"); | |
166 | return charge; | |
167 | } | |
168 | ||
169 | if (di->chip == BQ27500) | |
170 | charge *= 1000; | |
171 | else | |
172 | charge = charge * 3570 / BQ27000_RS; | |
173 | ||
174 | return charge; | |
175 | } | |
176 | ||
177 | /* | |
178 | * Return the battery Nominal available capaciy in µAh | |
179 | * Or < 0 if something fails. | |
180 | */ | |
181 | static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di) | |
182 | { | |
183 | return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC); | |
184 | } | |
185 | ||
186 | /* | |
187 | * Return the battery Last measured discharge in µAh | |
188 | * Or < 0 if something fails. | |
189 | */ | |
190 | static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di) | |
191 | { | |
192 | return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD); | |
193 | } | |
194 | ||
195 | /* | |
196 | * Return the battery Initial last measured discharge in µAh | |
197 | * Or < 0 if something fails. | |
198 | */ | |
199 | static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di) | |
200 | { | |
201 | int ilmd; | |
202 | ||
203 | if (di->chip == BQ27500) | |
204 | ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false); | |
205 | else | |
206 | ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true); | |
207 | ||
208 | if (ilmd < 0) { | |
209 | dev_err(di->dev, "error reading initial last measured discharge\n"); | |
210 | return ilmd; | |
211 | } | |
212 | ||
213 | if (di->chip == BQ27500) | |
214 | ilmd *= 1000; | |
215 | else | |
216 | ilmd = ilmd * 256 * 3570 / BQ27000_RS; | |
217 | ||
218 | return ilmd; | |
219 | } | |
220 | ||
221 | /* | |
222 | * Return the battery Cycle count total | |
223 | * Or < 0 if something fails. | |
224 | */ | |
225 | static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di) | |
226 | { | |
227 | int cyct; | |
228 | ||
229 | cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false); | |
230 | if (cyct < 0) | |
231 | dev_err(di->dev, "error reading cycle count total\n"); | |
232 | ||
233 | return cyct; | |
234 | } | |
235 | ||
b996ad0e | 236 | /* |
297a533b LPC |
237 | * Read a time register. |
238 | * Return < 0 if something fails. | |
b996ad0e | 239 | */ |
297a533b | 240 | static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg) |
b996ad0e | 241 | { |
297a533b | 242 | int tval; |
b996ad0e | 243 | |
297a533b LPC |
244 | tval = bq27x00_read(di, reg, false); |
245 | if (tval < 0) { | |
246 | dev_err(di->dev, "error reading register %02x: %d\n", reg, tval); | |
247 | return tval; | |
b996ad0e RG |
248 | } |
249 | ||
297a533b LPC |
250 | if (tval == 65535) |
251 | return -ENODATA; | |
252 | ||
253 | return tval * 60; | |
254 | } | |
255 | ||
256 | static void bq27x00_update(struct bq27x00_device_info *di) | |
257 | { | |
258 | struct bq27x00_reg_cache cache = {0, }; | |
259 | bool is_bq27500 = di->chip == BQ27500; | |
260 | ||
261 | cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, is_bq27500); | |
262 | if (cache.flags >= 0) { | |
263 | cache.capacity = bq27x00_battery_read_rsoc(di); | |
264 | cache.temperature = bq27x00_read(di, BQ27x00_REG_TEMP, false); | |
265 | cache.time_to_empty = bq27x00_battery_read_time(di, BQ27x00_REG_TTE); | |
266 | cache.time_to_empty_avg = bq27x00_battery_read_time(di, BQ27x00_REG_TTECP); | |
267 | cache.time_to_full = bq27x00_battery_read_time(di, BQ27x00_REG_TTF); | |
631c17ee PR |
268 | cache.charge_full = bq27x00_battery_read_lmd(di); |
269 | cache.charge_counter = bq27x00_battery_read_cyct(di); | |
297a533b LPC |
270 | |
271 | if (!is_bq27500) | |
272 | cache.current_now = bq27x00_read(di, BQ27x00_REG_AI, false); | |
631c17ee PR |
273 | |
274 | /* We only have to read charge design full once */ | |
275 | if (di->charge_design_full <= 0) | |
276 | di->charge_design_full = bq27x00_battery_read_ilmd(di); | |
297a533b LPC |
277 | } |
278 | ||
279 | /* Ignore current_now which is a snapshot of the current battery state | |
280 | * and is likely to be different even between two consecutive reads */ | |
281 | if (memcmp(&di->cache, &cache, sizeof(cache) - sizeof(int)) != 0) { | |
282 | di->cache = cache; | |
283 | power_supply_changed(&di->bat); | |
284 | } | |
285 | ||
286 | di->last_update = jiffies; | |
287 | } | |
288 | ||
740b755a LPC |
289 | static void bq27x00_battery_poll(struct work_struct *work) |
290 | { | |
291 | struct bq27x00_device_info *di = | |
292 | container_of(work, struct bq27x00_device_info, work.work); | |
293 | ||
294 | bq27x00_update(di); | |
295 | ||
296 | if (poll_interval > 0) { | |
297 | /* The timer does not have to be accurate. */ | |
298 | set_timer_slack(&di->work.timer, poll_interval * HZ / 4); | |
299 | schedule_delayed_work(&di->work, poll_interval * HZ); | |
300 | } | |
301 | } | |
302 | ||
303 | ||
297a533b LPC |
304 | /* |
305 | * Return the battery temperature in tenths of degree Celsius | |
306 | * Or < 0 if something fails. | |
307 | */ | |
308 | static int bq27x00_battery_temperature(struct bq27x00_device_info *di, | |
309 | union power_supply_propval *val) | |
310 | { | |
311 | if (di->cache.temperature < 0) | |
312 | return di->cache.temperature; | |
313 | ||
314 | if (di->chip == BQ27500) | |
315 | val->intval = di->cache.temperature - 2731; | |
316 | else | |
317 | val->intval = ((di->cache.temperature * 5) - 5463) / 2; | |
318 | ||
319 | return 0; | |
b996ad0e RG |
320 | } |
321 | ||
322 | /* | |
323 | * Return the battery average current | |
324 | * Note that current can be negative signed as well | |
325 | * Or 0 if something fails. | |
326 | */ | |
297a533b LPC |
327 | static int bq27x00_battery_current(struct bq27x00_device_info *di, |
328 | union power_supply_propval *val) | |
b996ad0e | 329 | { |
297a533b | 330 | int curr; |
b996ad0e | 331 | |
297a533b LPC |
332 | if (di->chip == BQ27500) |
333 | curr = bq27x00_read(di, BQ27x00_REG_AI, false); | |
334 | else | |
335 | curr = di->cache.current_now; | |
336 | ||
337 | if (curr < 0) | |
338 | return curr; | |
e20908d9 GI |
339 | |
340 | if (di->chip == BQ27500) { | |
341 | /* bq27500 returns signed value */ | |
297a533b | 342 | val->intval = (int)((s16)curr) * 1000; |
e20908d9 | 343 | } else { |
297a533b | 344 | if (di->cache.flags & BQ27000_FLAG_CHGS) { |
e20908d9 | 345 | dev_dbg(di->dev, "negative current!\n"); |
afbc74fd | 346 | curr = -curr; |
e20908d9 | 347 | } |
b996ad0e | 348 | |
297a533b | 349 | val->intval = curr * 3570 / BQ27000_RS; |
b996ad0e RG |
350 | } |
351 | ||
297a533b | 352 | return 0; |
b996ad0e RG |
353 | } |
354 | ||
4e924a81 | 355 | static int bq27x00_battery_status(struct bq27x00_device_info *di, |
297a533b | 356 | union power_supply_propval *val) |
4e924a81 | 357 | { |
4e924a81 | 358 | int status; |
4e924a81 GI |
359 | |
360 | if (di->chip == BQ27500) { | |
297a533b | 361 | if (di->cache.flags & BQ27500_FLAG_FC) |
4e924a81 | 362 | status = POWER_SUPPLY_STATUS_FULL; |
297a533b | 363 | else if (di->cache.flags & BQ27500_FLAG_DSC) |
4e924a81 GI |
364 | status = POWER_SUPPLY_STATUS_DISCHARGING; |
365 | else | |
366 | status = POWER_SUPPLY_STATUS_CHARGING; | |
367 | } else { | |
297a533b | 368 | if (di->cache.flags & BQ27000_FLAG_CHGS) |
4e924a81 GI |
369 | status = POWER_SUPPLY_STATUS_CHARGING; |
370 | else | |
371 | status = POWER_SUPPLY_STATUS_DISCHARGING; | |
372 | } | |
373 | ||
374 | val->intval = status; | |
297a533b | 375 | |
4e924a81 GI |
376 | return 0; |
377 | } | |
378 | ||
379 | /* | |
297a533b LPC |
380 | * Return the battery Voltage in milivolts |
381 | * Or < 0 if something fails. | |
4e924a81 | 382 | */ |
297a533b LPC |
383 | static int bq27x00_battery_voltage(struct bq27x00_device_info *di, |
384 | union power_supply_propval *val) | |
4e924a81 | 385 | { |
297a533b | 386 | int volt; |
4e924a81 | 387 | |
297a533b LPC |
388 | volt = bq27x00_read(di, BQ27x00_REG_VOLT, false); |
389 | if (volt < 0) | |
390 | return volt; | |
4e924a81 | 391 | |
297a533b LPC |
392 | val->intval = volt * 1000; |
393 | ||
394 | return 0; | |
395 | } | |
396 | ||
631c17ee PR |
397 | /* |
398 | * Return the battery Available energy in µWh | |
399 | * Or < 0 if something fails. | |
400 | */ | |
401 | static int bq27x00_battery_energy(struct bq27x00_device_info *di, | |
402 | union power_supply_propval *val) | |
403 | { | |
404 | int ae; | |
405 | ||
406 | ae = bq27x00_read(di, BQ27x00_REG_AE, false); | |
407 | if (ae < 0) { | |
408 | dev_err(di->dev, "error reading available energy\n"); | |
409 | return ae; | |
410 | } | |
411 | ||
412 | if (di->chip == BQ27500) | |
413 | ae *= 1000; | |
414 | else | |
415 | ae = ae * 29200 / BQ27000_RS; | |
416 | ||
417 | val->intval = ae; | |
418 | ||
419 | return 0; | |
420 | } | |
421 | ||
422 | ||
297a533b LPC |
423 | static int bq27x00_simple_value(int value, |
424 | union power_supply_propval *val) | |
425 | { | |
426 | if (value < 0) | |
427 | return value; | |
428 | ||
429 | val->intval = value; | |
4e924a81 | 430 | |
4e924a81 GI |
431 | return 0; |
432 | } | |
433 | ||
b996ad0e RG |
434 | #define to_bq27x00_device_info(x) container_of((x), \ |
435 | struct bq27x00_device_info, bat); | |
436 | ||
437 | static int bq27x00_battery_get_property(struct power_supply *psy, | |
438 | enum power_supply_property psp, | |
439 | union power_supply_propval *val) | |
440 | { | |
4e924a81 | 441 | int ret = 0; |
b996ad0e | 442 | struct bq27x00_device_info *di = to_bq27x00_device_info(psy); |
3413b4ea | 443 | |
740b755a LPC |
444 | mutex_lock(&di->lock); |
445 | if (time_is_before_jiffies(di->last_update + 5 * HZ)) { | |
446 | cancel_delayed_work_sync(&di->work); | |
447 | bq27x00_battery_poll(&di->work.work); | |
448 | } | |
449 | mutex_unlock(&di->lock); | |
297a533b LPC |
450 | |
451 | if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0) | |
3413b4ea | 452 | return -ENODEV; |
b996ad0e RG |
453 | |
454 | switch (psp) { | |
4e924a81 GI |
455 | case POWER_SUPPLY_PROP_STATUS: |
456 | ret = bq27x00_battery_status(di, val); | |
457 | break; | |
b996ad0e | 458 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
297a533b | 459 | ret = bq27x00_battery_voltage(di, val); |
3413b4ea | 460 | break; |
b996ad0e | 461 | case POWER_SUPPLY_PROP_PRESENT: |
297a533b | 462 | val->intval = di->cache.flags < 0 ? 0 : 1; |
b996ad0e RG |
463 | break; |
464 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
297a533b | 465 | ret = bq27x00_battery_current(di, val); |
b996ad0e RG |
466 | break; |
467 | case POWER_SUPPLY_PROP_CAPACITY: | |
297a533b | 468 | ret = bq27x00_simple_value(di->cache.capacity, val); |
b996ad0e RG |
469 | break; |
470 | case POWER_SUPPLY_PROP_TEMP: | |
297a533b | 471 | ret = bq27x00_battery_temperature(di, val); |
b996ad0e | 472 | break; |
4e924a81 | 473 | case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW: |
297a533b | 474 | ret = bq27x00_simple_value(di->cache.time_to_empty, val); |
4e924a81 GI |
475 | break; |
476 | case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG: | |
297a533b | 477 | ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val); |
4e924a81 GI |
478 | break; |
479 | case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW: | |
297a533b | 480 | ret = bq27x00_simple_value(di->cache.time_to_full, val); |
4e924a81 | 481 | break; |
5661f334 LPC |
482 | case POWER_SUPPLY_PROP_TECHNOLOGY: |
483 | val->intval = POWER_SUPPLY_TECHNOLOGY_LION; | |
484 | break; | |
631c17ee PR |
485 | case POWER_SUPPLY_PROP_CHARGE_NOW: |
486 | ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val); | |
487 | break; | |
488 | case POWER_SUPPLY_PROP_CHARGE_FULL: | |
489 | ret = bq27x00_simple_value(di->cache.charge_full, val); | |
490 | break; | |
491 | case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: | |
492 | ret = bq27x00_simple_value(di->charge_design_full, val); | |
493 | break; | |
494 | case POWER_SUPPLY_PROP_CHARGE_COUNTER: | |
495 | ret = bq27x00_simple_value(di->cache.charge_counter, val); | |
496 | break; | |
497 | case POWER_SUPPLY_PROP_ENERGY_NOW: | |
498 | ret = bq27x00_battery_energy(di, val); | |
499 | break; | |
b996ad0e RG |
500 | default: |
501 | return -EINVAL; | |
502 | } | |
503 | ||
4e924a81 | 504 | return ret; |
b996ad0e RG |
505 | } |
506 | ||
740b755a LPC |
507 | static void bq27x00_external_power_changed(struct power_supply *psy) |
508 | { | |
509 | struct bq27x00_device_info *di = to_bq27x00_device_info(psy); | |
510 | ||
511 | cancel_delayed_work_sync(&di->work); | |
512 | schedule_delayed_work(&di->work, 0); | |
513 | } | |
514 | ||
a40402ef | 515 | static int bq27x00_powersupply_init(struct bq27x00_device_info *di) |
b996ad0e | 516 | { |
a40402ef LPC |
517 | int ret; |
518 | ||
b996ad0e RG |
519 | di->bat.type = POWER_SUPPLY_TYPE_BATTERY; |
520 | di->bat.properties = bq27x00_battery_props; | |
521 | di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props); | |
522 | di->bat.get_property = bq27x00_battery_get_property; | |
740b755a LPC |
523 | di->bat.external_power_changed = bq27x00_external_power_changed; |
524 | ||
525 | INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll); | |
526 | mutex_init(&di->lock); | |
a40402ef LPC |
527 | |
528 | ret = power_supply_register(di->dev, &di->bat); | |
529 | if (ret) { | |
530 | dev_err(di->dev, "failed to register battery: %d\n", ret); | |
531 | return ret; | |
532 | } | |
533 | ||
534 | dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION); | |
535 | ||
297a533b LPC |
536 | bq27x00_update(di); |
537 | ||
a40402ef | 538 | return 0; |
b996ad0e RG |
539 | } |
540 | ||
740b755a LPC |
541 | static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di) |
542 | { | |
543 | cancel_delayed_work_sync(&di->work); | |
544 | ||
545 | power_supply_unregister(&di->bat); | |
546 | ||
547 | mutex_destroy(&di->lock); | |
548 | } | |
549 | ||
7fb7ba58 LPC |
550 | |
551 | /* i2c specific code */ | |
552 | #ifdef CONFIG_BATTERY_BQ27X00_I2C | |
553 | ||
554 | /* If the system has several batteries we need a different name for each | |
555 | * of them... | |
b996ad0e | 556 | */ |
7fb7ba58 LPC |
557 | static DEFINE_IDR(battery_id); |
558 | static DEFINE_MUTEX(battery_mutex); | |
b996ad0e | 559 | |
297a533b | 560 | static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single) |
b996ad0e | 561 | { |
a40402ef | 562 | struct i2c_client *client = to_i2c_client(di->dev); |
b996ad0e RG |
563 | struct i2c_msg msg[1]; |
564 | unsigned char data[2]; | |
297a533b | 565 | int ret; |
b996ad0e RG |
566 | |
567 | if (!client->adapter) | |
568 | return -ENODEV; | |
569 | ||
570 | msg->addr = client->addr; | |
571 | msg->flags = 0; | |
572 | msg->len = 1; | |
573 | msg->buf = data; | |
574 | ||
575 | data[0] = reg; | |
297a533b | 576 | ret = i2c_transfer(client->adapter, msg, 1); |
b996ad0e | 577 | |
297a533b | 578 | if (ret >= 0) { |
a40402ef | 579 | if (!single) |
b996ad0e RG |
580 | msg->len = 2; |
581 | else | |
582 | msg->len = 1; | |
583 | ||
584 | msg->flags = I2C_M_RD; | |
297a533b LPC |
585 | ret = i2c_transfer(client->adapter, msg, 1); |
586 | if (ret >= 0) { | |
a40402ef | 587 | if (!single) |
297a533b | 588 | ret = get_unaligned_le16(data); |
b996ad0e | 589 | else |
297a533b | 590 | ret = data[0]; |
b996ad0e RG |
591 | } |
592 | } | |
297a533b | 593 | return ret; |
b996ad0e RG |
594 | } |
595 | ||
e20908d9 | 596 | static int bq27x00_battery_probe(struct i2c_client *client, |
b996ad0e RG |
597 | const struct i2c_device_id *id) |
598 | { | |
599 | char *name; | |
600 | struct bq27x00_device_info *di; | |
b996ad0e RG |
601 | int num; |
602 | int retval = 0; | |
603 | ||
604 | /* Get new ID for the new battery device */ | |
605 | retval = idr_pre_get(&battery_id, GFP_KERNEL); | |
606 | if (retval == 0) | |
607 | return -ENOMEM; | |
608 | mutex_lock(&battery_mutex); | |
609 | retval = idr_get_new(&battery_id, client, &num); | |
610 | mutex_unlock(&battery_mutex); | |
611 | if (retval < 0) | |
612 | return retval; | |
613 | ||
e20908d9 | 614 | name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num); |
b996ad0e RG |
615 | if (!name) { |
616 | dev_err(&client->dev, "failed to allocate device name\n"); | |
617 | retval = -ENOMEM; | |
618 | goto batt_failed_1; | |
619 | } | |
620 | ||
621 | di = kzalloc(sizeof(*di), GFP_KERNEL); | |
622 | if (!di) { | |
623 | dev_err(&client->dev, "failed to allocate device info data\n"); | |
624 | retval = -ENOMEM; | |
625 | goto batt_failed_2; | |
626 | } | |
a40402ef | 627 | |
b996ad0e | 628 | di->id = num; |
a40402ef | 629 | di->dev = &client->dev; |
e20908d9 | 630 | di->chip = id->driver_data; |
a40402ef LPC |
631 | di->bat.name = name; |
632 | di->bus.read = &bq27x00_read_i2c; | |
b996ad0e | 633 | |
a40402ef | 634 | if (bq27x00_powersupply_init(di)) |
b996ad0e | 635 | goto batt_failed_3; |
b996ad0e RG |
636 | |
637 | i2c_set_clientdata(client, di); | |
b996ad0e RG |
638 | |
639 | return 0; | |
640 | ||
b996ad0e RG |
641 | batt_failed_3: |
642 | kfree(di); | |
643 | batt_failed_2: | |
644 | kfree(name); | |
645 | batt_failed_1: | |
646 | mutex_lock(&battery_mutex); | |
647 | idr_remove(&battery_id, num); | |
648 | mutex_unlock(&battery_mutex); | |
649 | ||
650 | return retval; | |
651 | } | |
652 | ||
e20908d9 | 653 | static int bq27x00_battery_remove(struct i2c_client *client) |
b996ad0e RG |
654 | { |
655 | struct bq27x00_device_info *di = i2c_get_clientdata(client); | |
656 | ||
740b755a | 657 | bq27x00_powersupply_unregister(di); |
b996ad0e RG |
658 | |
659 | kfree(di->bat.name); | |
660 | ||
661 | mutex_lock(&battery_mutex); | |
662 | idr_remove(&battery_id, di->id); | |
663 | mutex_unlock(&battery_mutex); | |
664 | ||
665 | kfree(di); | |
666 | ||
667 | return 0; | |
668 | } | |
669 | ||
e20908d9 GI |
670 | static const struct i2c_device_id bq27x00_id[] = { |
671 | { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */ | |
672 | { "bq27500", BQ27500 }, | |
b996ad0e RG |
673 | {}, |
674 | }; | |
675 | ||
e20908d9 | 676 | static struct i2c_driver bq27x00_battery_driver = { |
b996ad0e | 677 | .driver = { |
e20908d9 | 678 | .name = "bq27x00-battery", |
b996ad0e | 679 | }, |
e20908d9 GI |
680 | .probe = bq27x00_battery_probe, |
681 | .remove = bq27x00_battery_remove, | |
682 | .id_table = bq27x00_id, | |
b996ad0e RG |
683 | }; |
684 | ||
7fb7ba58 LPC |
685 | static inline int bq27x00_battery_i2c_init(void) |
686 | { | |
687 | int ret = i2c_add_driver(&bq27x00_battery_driver); | |
688 | if (ret) | |
689 | printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n"); | |
690 | ||
691 | return ret; | |
692 | } | |
693 | ||
694 | static inline void bq27x00_battery_i2c_exit(void) | |
695 | { | |
696 | i2c_del_driver(&bq27x00_battery_driver); | |
697 | } | |
698 | ||
699 | #else | |
700 | ||
701 | static inline int bq27x00_battery_i2c_init(void) { return 0; } | |
702 | static inline void bq27x00_battery_i2c_exit(void) {}; | |
703 | ||
704 | #endif | |
705 | ||
706 | /* platform specific code */ | |
707 | #ifdef CONFIG_BATTERY_BQ27X00_PLATFORM | |
708 | ||
709 | static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg, | |
297a533b | 710 | bool single) |
7fb7ba58 LPC |
711 | { |
712 | struct device *dev = di->dev; | |
713 | struct bq27000_platform_data *pdata = dev->platform_data; | |
714 | unsigned int timeout = 3; | |
715 | int upper, lower; | |
716 | int temp; | |
717 | ||
718 | if (!single) { | |
719 | /* Make sure the value has not changed in between reading the | |
720 | * lower and the upper part */ | |
721 | upper = pdata->read(dev, reg + 1); | |
722 | do { | |
723 | temp = upper; | |
724 | if (upper < 0) | |
725 | return upper; | |
726 | ||
727 | lower = pdata->read(dev, reg); | |
728 | if (lower < 0) | |
729 | return lower; | |
730 | ||
731 | upper = pdata->read(dev, reg + 1); | |
732 | } while (temp != upper && --timeout); | |
733 | ||
734 | if (timeout == 0) | |
735 | return -EIO; | |
736 | ||
297a533b | 737 | return (upper << 8) | lower; |
7fb7ba58 | 738 | } |
297a533b LPC |
739 | |
740 | return pdata->read(dev, reg); | |
7fb7ba58 LPC |
741 | } |
742 | ||
743 | static int __devinit bq27000_battery_probe(struct platform_device *pdev) | |
744 | { | |
745 | struct bq27x00_device_info *di; | |
746 | struct bq27000_platform_data *pdata = pdev->dev.platform_data; | |
747 | int ret; | |
748 | ||
749 | if (!pdata) { | |
750 | dev_err(&pdev->dev, "no platform_data supplied\n"); | |
751 | return -EINVAL; | |
752 | } | |
753 | ||
754 | if (!pdata->read) { | |
755 | dev_err(&pdev->dev, "no hdq read callback supplied\n"); | |
756 | return -EINVAL; | |
757 | } | |
758 | ||
759 | di = kzalloc(sizeof(*di), GFP_KERNEL); | |
760 | if (!di) { | |
761 | dev_err(&pdev->dev, "failed to allocate device info data\n"); | |
762 | return -ENOMEM; | |
763 | } | |
764 | ||
765 | platform_set_drvdata(pdev, di); | |
766 | ||
767 | di->dev = &pdev->dev; | |
768 | di->chip = BQ27000; | |
769 | ||
770 | di->bat.name = pdata->name ?: dev_name(&pdev->dev); | |
771 | di->bus.read = &bq27000_read_platform; | |
772 | ||
773 | ret = bq27x00_powersupply_init(di); | |
774 | if (ret) | |
775 | goto err_free; | |
776 | ||
777 | return 0; | |
778 | ||
779 | err_free: | |
780 | platform_set_drvdata(pdev, NULL); | |
781 | kfree(di); | |
782 | ||
783 | return ret; | |
784 | } | |
785 | ||
786 | static int __devexit bq27000_battery_remove(struct platform_device *pdev) | |
787 | { | |
788 | struct bq27x00_device_info *di = platform_get_drvdata(pdev); | |
789 | ||
740b755a LPC |
790 | bq27x00_powersupply_unregister(di); |
791 | ||
7fb7ba58 LPC |
792 | platform_set_drvdata(pdev, NULL); |
793 | kfree(di); | |
794 | ||
795 | return 0; | |
796 | } | |
797 | ||
798 | static struct platform_driver bq27000_battery_driver = { | |
799 | .probe = bq27000_battery_probe, | |
800 | .remove = __devexit_p(bq27000_battery_remove), | |
801 | .driver = { | |
802 | .name = "bq27000-battery", | |
803 | .owner = THIS_MODULE, | |
804 | }, | |
805 | }; | |
806 | ||
807 | static inline int bq27x00_battery_platform_init(void) | |
808 | { | |
809 | int ret = platform_driver_register(&bq27000_battery_driver); | |
810 | if (ret) | |
811 | printk(KERN_ERR "Unable to register BQ27000 platform driver\n"); | |
812 | ||
813 | return ret; | |
814 | } | |
815 | ||
816 | static inline void bq27x00_battery_platform_exit(void) | |
817 | { | |
818 | platform_driver_unregister(&bq27000_battery_driver); | |
819 | } | |
820 | ||
821 | #else | |
822 | ||
823 | static inline int bq27x00_battery_platform_init(void) { return 0; } | |
824 | static inline void bq27x00_battery_platform_exit(void) {}; | |
825 | ||
826 | #endif | |
827 | ||
828 | /* | |
829 | * Module stuff | |
830 | */ | |
831 | ||
b996ad0e RG |
832 | static int __init bq27x00_battery_init(void) |
833 | { | |
834 | int ret; | |
835 | ||
7fb7ba58 LPC |
836 | ret = bq27x00_battery_i2c_init(); |
837 | if (ret) | |
838 | return ret; | |
839 | ||
840 | ret = bq27x00_battery_platform_init(); | |
b996ad0e | 841 | if (ret) |
7fb7ba58 | 842 | bq27x00_battery_i2c_exit(); |
b996ad0e RG |
843 | |
844 | return ret; | |
845 | } | |
846 | module_init(bq27x00_battery_init); | |
847 | ||
848 | static void __exit bq27x00_battery_exit(void) | |
849 | { | |
7fb7ba58 LPC |
850 | bq27x00_battery_platform_exit(); |
851 | bq27x00_battery_i2c_exit(); | |
b996ad0e RG |
852 | } |
853 | module_exit(bq27x00_battery_exit); | |
854 | ||
855 | MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>"); | |
856 | MODULE_DESCRIPTION("BQ27x00 battery monitor driver"); | |
857 | MODULE_LICENSE("GPL"); |