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> |
73c244a8 | 7 | * Copyright (C) 2011 Pali Rohár <pali.rohar@gmail.com> |
b996ad0e RG |
8 | * |
9 | * Based on a previous work by Copyright (C) 2008 Texas Instruments, Inc. | |
10 | * | |
11 | * This package is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | * | |
15 | * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
16 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
17 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
18 | * | |
19 | */ | |
631c17ee PR |
20 | |
21 | /* | |
22 | * Datasheets: | |
23 | * http://focus.ti.com/docs/prod/folders/print/bq27000.html | |
24 | * http://focus.ti.com/docs/prod/folders/print/bq27500.html | |
25 | */ | |
26 | ||
b996ad0e RG |
27 | #include <linux/module.h> |
28 | #include <linux/param.h> | |
29 | #include <linux/jiffies.h> | |
30 | #include <linux/workqueue.h> | |
31 | #include <linux/delay.h> | |
32 | #include <linux/platform_device.h> | |
33 | #include <linux/power_supply.h> | |
34 | #include <linux/idr.h> | |
b996ad0e | 35 | #include <linux/i2c.h> |
5a0e3ad6 | 36 | #include <linux/slab.h> |
8aef7e8f | 37 | #include <asm/unaligned.h> |
b996ad0e | 38 | |
7fb7ba58 LPC |
39 | #include <linux/power/bq27x00_battery.h> |
40 | ||
631c17ee | 41 | #define DRIVER_VERSION "1.2.0" |
b996ad0e RG |
42 | |
43 | #define BQ27x00_REG_TEMP 0x06 | |
44 | #define BQ27x00_REG_VOLT 0x08 | |
b996ad0e RG |
45 | #define BQ27x00_REG_AI 0x14 |
46 | #define BQ27x00_REG_FLAGS 0x0A | |
4e924a81 GI |
47 | #define BQ27x00_REG_TTE 0x16 |
48 | #define BQ27x00_REG_TTF 0x18 | |
49 | #define BQ27x00_REG_TTECP 0x26 | |
631c17ee PR |
50 | #define BQ27x00_REG_NAC 0x0C /* Nominal available capaciy */ |
51 | #define BQ27x00_REG_LMD 0x12 /* Last measured discharge */ | |
52 | #define BQ27x00_REG_CYCT 0x2A /* Cycle count total */ | |
53 | #define BQ27x00_REG_AE 0x22 /* Available enery */ | |
b996ad0e | 54 | |
e20908d9 | 55 | #define BQ27000_REG_RSOC 0x0B /* Relative State-of-Charge */ |
631c17ee | 56 | #define BQ27000_REG_ILMD 0x76 /* Initial last measured discharge */ |
4e924a81 | 57 | #define BQ27000_FLAG_CHGS BIT(7) |
c1b9ab67 | 58 | #define BQ27000_FLAG_FC BIT(5) |
e20908d9 | 59 | |
bf7d4140 | 60 | #define BQ27500_REG_SOC 0x2C |
631c17ee | 61 | #define BQ27500_REG_DCAP 0x3C /* Design capacity */ |
4e924a81 GI |
62 | #define BQ27500_FLAG_DSC BIT(0) |
63 | #define BQ27500_FLAG_FC BIT(9) | |
e20908d9 | 64 | |
a2e5118c PR |
65 | #define BQ27000_RS 20 /* Resistor sense */ |
66 | ||
b996ad0e RG |
67 | struct bq27x00_device_info; |
68 | struct bq27x00_access_methods { | |
297a533b | 69 | int (*read)(struct bq27x00_device_info *di, u8 reg, bool single); |
b996ad0e RG |
70 | }; |
71 | ||
e20908d9 GI |
72 | enum bq27x00_chip { BQ27000, BQ27500 }; |
73 | ||
297a533b LPC |
74 | struct bq27x00_reg_cache { |
75 | int temperature; | |
76 | int time_to_empty; | |
77 | int time_to_empty_avg; | |
78 | int time_to_full; | |
631c17ee | 79 | int charge_full; |
73c244a8 | 80 | int cycle_count; |
297a533b LPC |
81 | int capacity; |
82 | int flags; | |
297a533b LPC |
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, | |
73c244a8 | 117 | POWER_SUPPLY_PROP_CYCLE_COUNT, |
631c17ee | 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 | 268 | cache.charge_full = bq27x00_battery_read_lmd(di); |
73c244a8 | 269 | cache.cycle_count = bq27x00_battery_read_cyct(di); |
297a533b | 270 | |
631c17ee PR |
271 | /* We only have to read charge design full once */ |
272 | if (di->charge_design_full <= 0) | |
273 | di->charge_design_full = bq27x00_battery_read_ilmd(di); | |
297a533b LPC |
274 | } |
275 | ||
b68f6216 | 276 | if (memcmp(&di->cache, &cache, sizeof(cache)) != 0) { |
297a533b LPC |
277 | di->cache = cache; |
278 | power_supply_changed(&di->bat); | |
279 | } | |
280 | ||
281 | di->last_update = jiffies; | |
282 | } | |
283 | ||
740b755a LPC |
284 | static void bq27x00_battery_poll(struct work_struct *work) |
285 | { | |
286 | struct bq27x00_device_info *di = | |
287 | container_of(work, struct bq27x00_device_info, work.work); | |
288 | ||
289 | bq27x00_update(di); | |
290 | ||
291 | if (poll_interval > 0) { | |
292 | /* The timer does not have to be accurate. */ | |
293 | set_timer_slack(&di->work.timer, poll_interval * HZ / 4); | |
294 | schedule_delayed_work(&di->work, poll_interval * HZ); | |
295 | } | |
296 | } | |
297 | ||
298 | ||
297a533b LPC |
299 | /* |
300 | * Return the battery temperature in tenths of degree Celsius | |
301 | * Or < 0 if something fails. | |
302 | */ | |
303 | static int bq27x00_battery_temperature(struct bq27x00_device_info *di, | |
304 | union power_supply_propval *val) | |
305 | { | |
306 | if (di->cache.temperature < 0) | |
307 | return di->cache.temperature; | |
308 | ||
309 | if (di->chip == BQ27500) | |
310 | val->intval = di->cache.temperature - 2731; | |
311 | else | |
312 | val->intval = ((di->cache.temperature * 5) - 5463) / 2; | |
313 | ||
314 | return 0; | |
b996ad0e RG |
315 | } |
316 | ||
317 | /* | |
bf7d4140 | 318 | * Return the battery average current in µA |
b996ad0e RG |
319 | * Note that current can be negative signed as well |
320 | * Or 0 if something fails. | |
321 | */ | |
297a533b LPC |
322 | static int bq27x00_battery_current(struct bq27x00_device_info *di, |
323 | union power_supply_propval *val) | |
b996ad0e | 324 | { |
297a533b | 325 | int curr; |
b68f6216 | 326 | int flags; |
b996ad0e | 327 | |
b68f6216 | 328 | curr = bq27x00_read(di, BQ27x00_REG_AI, false); |
297a533b LPC |
329 | if (curr < 0) |
330 | return curr; | |
e20908d9 GI |
331 | |
332 | if (di->chip == BQ27500) { | |
333 | /* bq27500 returns signed value */ | |
297a533b | 334 | val->intval = (int)((s16)curr) * 1000; |
e20908d9 | 335 | } else { |
b68f6216 PR |
336 | flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false); |
337 | if (flags & BQ27000_FLAG_CHGS) { | |
e20908d9 | 338 | dev_dbg(di->dev, "negative current!\n"); |
afbc74fd | 339 | curr = -curr; |
e20908d9 | 340 | } |
b996ad0e | 341 | |
297a533b | 342 | val->intval = curr * 3570 / BQ27000_RS; |
b996ad0e RG |
343 | } |
344 | ||
297a533b | 345 | return 0; |
b996ad0e RG |
346 | } |
347 | ||
4e924a81 | 348 | static int bq27x00_battery_status(struct bq27x00_device_info *di, |
297a533b | 349 | union power_supply_propval *val) |
4e924a81 | 350 | { |
4e924a81 | 351 | int status; |
4e924a81 GI |
352 | |
353 | if (di->chip == BQ27500) { | |
297a533b | 354 | if (di->cache.flags & BQ27500_FLAG_FC) |
4e924a81 | 355 | status = POWER_SUPPLY_STATUS_FULL; |
297a533b | 356 | else if (di->cache.flags & BQ27500_FLAG_DSC) |
4e924a81 GI |
357 | status = POWER_SUPPLY_STATUS_DISCHARGING; |
358 | else | |
359 | status = POWER_SUPPLY_STATUS_CHARGING; | |
360 | } else { | |
c1b9ab67 LPC |
361 | if (di->cache.flags & BQ27000_FLAG_FC) |
362 | status = POWER_SUPPLY_STATUS_FULL; | |
363 | else if (di->cache.flags & BQ27000_FLAG_CHGS) | |
4e924a81 | 364 | status = POWER_SUPPLY_STATUS_CHARGING; |
c1b9ab67 LPC |
365 | else if (power_supply_am_i_supplied(&di->bat)) |
366 | status = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
4e924a81 GI |
367 | else |
368 | status = POWER_SUPPLY_STATUS_DISCHARGING; | |
369 | } | |
370 | ||
371 | val->intval = status; | |
297a533b | 372 | |
4e924a81 GI |
373 | return 0; |
374 | } | |
375 | ||
376 | /* | |
297a533b LPC |
377 | * Return the battery Voltage in milivolts |
378 | * Or < 0 if something fails. | |
4e924a81 | 379 | */ |
297a533b LPC |
380 | static int bq27x00_battery_voltage(struct bq27x00_device_info *di, |
381 | union power_supply_propval *val) | |
4e924a81 | 382 | { |
297a533b | 383 | int volt; |
4e924a81 | 384 | |
297a533b LPC |
385 | volt = bq27x00_read(di, BQ27x00_REG_VOLT, false); |
386 | if (volt < 0) | |
387 | return volt; | |
4e924a81 | 388 | |
297a533b LPC |
389 | val->intval = volt * 1000; |
390 | ||
391 | return 0; | |
392 | } | |
393 | ||
631c17ee PR |
394 | /* |
395 | * Return the battery Available energy in µWh | |
396 | * Or < 0 if something fails. | |
397 | */ | |
398 | static int bq27x00_battery_energy(struct bq27x00_device_info *di, | |
399 | union power_supply_propval *val) | |
400 | { | |
401 | int ae; | |
402 | ||
403 | ae = bq27x00_read(di, BQ27x00_REG_AE, false); | |
404 | if (ae < 0) { | |
405 | dev_err(di->dev, "error reading available energy\n"); | |
406 | return ae; | |
407 | } | |
408 | ||
409 | if (di->chip == BQ27500) | |
410 | ae *= 1000; | |
411 | else | |
412 | ae = ae * 29200 / BQ27000_RS; | |
413 | ||
414 | val->intval = ae; | |
415 | ||
416 | return 0; | |
417 | } | |
418 | ||
419 | ||
297a533b LPC |
420 | static int bq27x00_simple_value(int value, |
421 | union power_supply_propval *val) | |
422 | { | |
423 | if (value < 0) | |
424 | return value; | |
425 | ||
426 | val->intval = value; | |
4e924a81 | 427 | |
4e924a81 GI |
428 | return 0; |
429 | } | |
430 | ||
b996ad0e RG |
431 | #define to_bq27x00_device_info(x) container_of((x), \ |
432 | struct bq27x00_device_info, bat); | |
433 | ||
434 | static int bq27x00_battery_get_property(struct power_supply *psy, | |
435 | enum power_supply_property psp, | |
436 | union power_supply_propval *val) | |
437 | { | |
4e924a81 | 438 | int ret = 0; |
b996ad0e | 439 | struct bq27x00_device_info *di = to_bq27x00_device_info(psy); |
3413b4ea | 440 | |
740b755a LPC |
441 | mutex_lock(&di->lock); |
442 | if (time_is_before_jiffies(di->last_update + 5 * HZ)) { | |
443 | cancel_delayed_work_sync(&di->work); | |
444 | bq27x00_battery_poll(&di->work.work); | |
445 | } | |
446 | mutex_unlock(&di->lock); | |
297a533b LPC |
447 | |
448 | if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0) | |
3413b4ea | 449 | return -ENODEV; |
b996ad0e RG |
450 | |
451 | switch (psp) { | |
4e924a81 GI |
452 | case POWER_SUPPLY_PROP_STATUS: |
453 | ret = bq27x00_battery_status(di, val); | |
454 | break; | |
b996ad0e | 455 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
297a533b | 456 | ret = bq27x00_battery_voltage(di, val); |
3413b4ea | 457 | break; |
b996ad0e | 458 | case POWER_SUPPLY_PROP_PRESENT: |
297a533b | 459 | val->intval = di->cache.flags < 0 ? 0 : 1; |
b996ad0e RG |
460 | break; |
461 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
297a533b | 462 | ret = bq27x00_battery_current(di, val); |
b996ad0e RG |
463 | break; |
464 | case POWER_SUPPLY_PROP_CAPACITY: | |
297a533b | 465 | ret = bq27x00_simple_value(di->cache.capacity, val); |
b996ad0e RG |
466 | break; |
467 | case POWER_SUPPLY_PROP_TEMP: | |
297a533b | 468 | ret = bq27x00_battery_temperature(di, val); |
b996ad0e | 469 | break; |
4e924a81 | 470 | case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW: |
297a533b | 471 | ret = bq27x00_simple_value(di->cache.time_to_empty, val); |
4e924a81 GI |
472 | break; |
473 | case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG: | |
297a533b | 474 | ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val); |
4e924a81 GI |
475 | break; |
476 | case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW: | |
297a533b | 477 | ret = bq27x00_simple_value(di->cache.time_to_full, val); |
4e924a81 | 478 | break; |
5661f334 LPC |
479 | case POWER_SUPPLY_PROP_TECHNOLOGY: |
480 | val->intval = POWER_SUPPLY_TECHNOLOGY_LION; | |
481 | break; | |
631c17ee PR |
482 | case POWER_SUPPLY_PROP_CHARGE_NOW: |
483 | ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val); | |
484 | break; | |
485 | case POWER_SUPPLY_PROP_CHARGE_FULL: | |
486 | ret = bq27x00_simple_value(di->cache.charge_full, val); | |
487 | break; | |
488 | case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: | |
489 | ret = bq27x00_simple_value(di->charge_design_full, val); | |
490 | break; | |
73c244a8 PR |
491 | case POWER_SUPPLY_PROP_CYCLE_COUNT: |
492 | ret = bq27x00_simple_value(di->cache.cycle_count, val); | |
631c17ee PR |
493 | break; |
494 | case POWER_SUPPLY_PROP_ENERGY_NOW: | |
495 | ret = bq27x00_battery_energy(di, val); | |
496 | break; | |
b996ad0e RG |
497 | default: |
498 | return -EINVAL; | |
499 | } | |
500 | ||
4e924a81 | 501 | return ret; |
b996ad0e RG |
502 | } |
503 | ||
740b755a LPC |
504 | static void bq27x00_external_power_changed(struct power_supply *psy) |
505 | { | |
506 | struct bq27x00_device_info *di = to_bq27x00_device_info(psy); | |
507 | ||
508 | cancel_delayed_work_sync(&di->work); | |
509 | schedule_delayed_work(&di->work, 0); | |
510 | } | |
511 | ||
a40402ef | 512 | static int bq27x00_powersupply_init(struct bq27x00_device_info *di) |
b996ad0e | 513 | { |
a40402ef LPC |
514 | int ret; |
515 | ||
b996ad0e RG |
516 | di->bat.type = POWER_SUPPLY_TYPE_BATTERY; |
517 | di->bat.properties = bq27x00_battery_props; | |
518 | di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props); | |
519 | di->bat.get_property = bq27x00_battery_get_property; | |
740b755a LPC |
520 | di->bat.external_power_changed = bq27x00_external_power_changed; |
521 | ||
522 | INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll); | |
523 | mutex_init(&di->lock); | |
a40402ef LPC |
524 | |
525 | ret = power_supply_register(di->dev, &di->bat); | |
526 | if (ret) { | |
527 | dev_err(di->dev, "failed to register battery: %d\n", ret); | |
528 | return ret; | |
529 | } | |
530 | ||
531 | dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION); | |
532 | ||
297a533b LPC |
533 | bq27x00_update(di); |
534 | ||
a40402ef | 535 | return 0; |
b996ad0e RG |
536 | } |
537 | ||
740b755a LPC |
538 | static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di) |
539 | { | |
540 | cancel_delayed_work_sync(&di->work); | |
541 | ||
542 | power_supply_unregister(&di->bat); | |
543 | ||
544 | mutex_destroy(&di->lock); | |
545 | } | |
546 | ||
7fb7ba58 LPC |
547 | |
548 | /* i2c specific code */ | |
549 | #ifdef CONFIG_BATTERY_BQ27X00_I2C | |
550 | ||
551 | /* If the system has several batteries we need a different name for each | |
552 | * of them... | |
b996ad0e | 553 | */ |
7fb7ba58 LPC |
554 | static DEFINE_IDR(battery_id); |
555 | static DEFINE_MUTEX(battery_mutex); | |
b996ad0e | 556 | |
297a533b | 557 | static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single) |
b996ad0e | 558 | { |
a40402ef | 559 | struct i2c_client *client = to_i2c_client(di->dev); |
9e912f45 | 560 | struct i2c_msg msg[2]; |
b996ad0e | 561 | unsigned char data[2]; |
297a533b | 562 | int ret; |
b996ad0e RG |
563 | |
564 | if (!client->adapter) | |
565 | return -ENODEV; | |
566 | ||
9e912f45 GI |
567 | msg[0].addr = client->addr; |
568 | msg[0].flags = 0; | |
569 | msg[0].buf = ® | |
570 | msg[0].len = sizeof(reg); | |
571 | msg[1].addr = client->addr; | |
572 | msg[1].flags = I2C_M_RD; | |
573 | msg[1].buf = data; | |
2ec523a8 | 574 | if (single) |
9e912f45 | 575 | msg[1].len = 1; |
2ec523a8 | 576 | else |
9e912f45 | 577 | msg[1].len = 2; |
2ec523a8 | 578 | |
9e912f45 | 579 | ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg)); |
2ec523a8 LPC |
580 | if (ret < 0) |
581 | return ret; | |
582 | ||
583 | if (!single) | |
584 | ret = get_unaligned_le16(data); | |
585 | else | |
586 | ret = data[0]; | |
b996ad0e | 587 | |
297a533b | 588 | return ret; |
b996ad0e RG |
589 | } |
590 | ||
e20908d9 | 591 | static int bq27x00_battery_probe(struct i2c_client *client, |
b996ad0e RG |
592 | const struct i2c_device_id *id) |
593 | { | |
594 | char *name; | |
595 | struct bq27x00_device_info *di; | |
b996ad0e RG |
596 | int num; |
597 | int retval = 0; | |
598 | ||
599 | /* Get new ID for the new battery device */ | |
600 | retval = idr_pre_get(&battery_id, GFP_KERNEL); | |
601 | if (retval == 0) | |
602 | return -ENOMEM; | |
603 | mutex_lock(&battery_mutex); | |
604 | retval = idr_get_new(&battery_id, client, &num); | |
605 | mutex_unlock(&battery_mutex); | |
606 | if (retval < 0) | |
607 | return retval; | |
608 | ||
e20908d9 | 609 | name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num); |
b996ad0e RG |
610 | if (!name) { |
611 | dev_err(&client->dev, "failed to allocate device name\n"); | |
612 | retval = -ENOMEM; | |
613 | goto batt_failed_1; | |
614 | } | |
615 | ||
616 | di = kzalloc(sizeof(*di), GFP_KERNEL); | |
617 | if (!di) { | |
618 | dev_err(&client->dev, "failed to allocate device info data\n"); | |
619 | retval = -ENOMEM; | |
620 | goto batt_failed_2; | |
621 | } | |
a40402ef | 622 | |
b996ad0e | 623 | di->id = num; |
a40402ef | 624 | di->dev = &client->dev; |
e20908d9 | 625 | di->chip = id->driver_data; |
a40402ef LPC |
626 | di->bat.name = name; |
627 | di->bus.read = &bq27x00_read_i2c; | |
b996ad0e | 628 | |
a40402ef | 629 | if (bq27x00_powersupply_init(di)) |
b996ad0e | 630 | goto batt_failed_3; |
b996ad0e RG |
631 | |
632 | i2c_set_clientdata(client, di); | |
b996ad0e RG |
633 | |
634 | return 0; | |
635 | ||
b996ad0e RG |
636 | batt_failed_3: |
637 | kfree(di); | |
638 | batt_failed_2: | |
639 | kfree(name); | |
640 | batt_failed_1: | |
641 | mutex_lock(&battery_mutex); | |
642 | idr_remove(&battery_id, num); | |
643 | mutex_unlock(&battery_mutex); | |
644 | ||
645 | return retval; | |
646 | } | |
647 | ||
e20908d9 | 648 | static int bq27x00_battery_remove(struct i2c_client *client) |
b996ad0e RG |
649 | { |
650 | struct bq27x00_device_info *di = i2c_get_clientdata(client); | |
651 | ||
740b755a | 652 | bq27x00_powersupply_unregister(di); |
b996ad0e RG |
653 | |
654 | kfree(di->bat.name); | |
655 | ||
656 | mutex_lock(&battery_mutex); | |
657 | idr_remove(&battery_id, di->id); | |
658 | mutex_unlock(&battery_mutex); | |
659 | ||
660 | kfree(di); | |
661 | ||
662 | return 0; | |
663 | } | |
664 | ||
e20908d9 GI |
665 | static const struct i2c_device_id bq27x00_id[] = { |
666 | { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */ | |
667 | { "bq27500", BQ27500 }, | |
b996ad0e RG |
668 | {}, |
669 | }; | |
fd9b958c | 670 | MODULE_DEVICE_TABLE(i2c, bq27x00_id); |
b996ad0e | 671 | |
e20908d9 | 672 | static struct i2c_driver bq27x00_battery_driver = { |
b996ad0e | 673 | .driver = { |
e20908d9 | 674 | .name = "bq27x00-battery", |
b996ad0e | 675 | }, |
e20908d9 GI |
676 | .probe = bq27x00_battery_probe, |
677 | .remove = bq27x00_battery_remove, | |
678 | .id_table = bq27x00_id, | |
b996ad0e RG |
679 | }; |
680 | ||
7fb7ba58 LPC |
681 | static inline int bq27x00_battery_i2c_init(void) |
682 | { | |
683 | int ret = i2c_add_driver(&bq27x00_battery_driver); | |
684 | if (ret) | |
685 | printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n"); | |
686 | ||
687 | return ret; | |
688 | } | |
689 | ||
690 | static inline void bq27x00_battery_i2c_exit(void) | |
691 | { | |
692 | i2c_del_driver(&bq27x00_battery_driver); | |
693 | } | |
694 | ||
695 | #else | |
696 | ||
697 | static inline int bq27x00_battery_i2c_init(void) { return 0; } | |
698 | static inline void bq27x00_battery_i2c_exit(void) {}; | |
699 | ||
700 | #endif | |
701 | ||
702 | /* platform specific code */ | |
703 | #ifdef CONFIG_BATTERY_BQ27X00_PLATFORM | |
704 | ||
705 | static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg, | |
297a533b | 706 | bool single) |
7fb7ba58 LPC |
707 | { |
708 | struct device *dev = di->dev; | |
709 | struct bq27000_platform_data *pdata = dev->platform_data; | |
710 | unsigned int timeout = 3; | |
711 | int upper, lower; | |
712 | int temp; | |
713 | ||
714 | if (!single) { | |
715 | /* Make sure the value has not changed in between reading the | |
716 | * lower and the upper part */ | |
717 | upper = pdata->read(dev, reg + 1); | |
718 | do { | |
719 | temp = upper; | |
720 | if (upper < 0) | |
721 | return upper; | |
722 | ||
723 | lower = pdata->read(dev, reg); | |
724 | if (lower < 0) | |
725 | return lower; | |
726 | ||
727 | upper = pdata->read(dev, reg + 1); | |
728 | } while (temp != upper && --timeout); | |
729 | ||
730 | if (timeout == 0) | |
731 | return -EIO; | |
732 | ||
297a533b | 733 | return (upper << 8) | lower; |
7fb7ba58 | 734 | } |
297a533b LPC |
735 | |
736 | return pdata->read(dev, reg); | |
7fb7ba58 LPC |
737 | } |
738 | ||
739 | static int __devinit bq27000_battery_probe(struct platform_device *pdev) | |
740 | { | |
741 | struct bq27x00_device_info *di; | |
742 | struct bq27000_platform_data *pdata = pdev->dev.platform_data; | |
743 | int ret; | |
744 | ||
745 | if (!pdata) { | |
746 | dev_err(&pdev->dev, "no platform_data supplied\n"); | |
747 | return -EINVAL; | |
748 | } | |
749 | ||
750 | if (!pdata->read) { | |
751 | dev_err(&pdev->dev, "no hdq read callback supplied\n"); | |
752 | return -EINVAL; | |
753 | } | |
754 | ||
755 | di = kzalloc(sizeof(*di), GFP_KERNEL); | |
756 | if (!di) { | |
757 | dev_err(&pdev->dev, "failed to allocate device info data\n"); | |
758 | return -ENOMEM; | |
759 | } | |
760 | ||
761 | platform_set_drvdata(pdev, di); | |
762 | ||
763 | di->dev = &pdev->dev; | |
764 | di->chip = BQ27000; | |
765 | ||
766 | di->bat.name = pdata->name ?: dev_name(&pdev->dev); | |
767 | di->bus.read = &bq27000_read_platform; | |
768 | ||
769 | ret = bq27x00_powersupply_init(di); | |
770 | if (ret) | |
771 | goto err_free; | |
772 | ||
773 | return 0; | |
774 | ||
775 | err_free: | |
776 | platform_set_drvdata(pdev, NULL); | |
777 | kfree(di); | |
778 | ||
779 | return ret; | |
780 | } | |
781 | ||
782 | static int __devexit bq27000_battery_remove(struct platform_device *pdev) | |
783 | { | |
784 | struct bq27x00_device_info *di = platform_get_drvdata(pdev); | |
785 | ||
740b755a LPC |
786 | bq27x00_powersupply_unregister(di); |
787 | ||
7fb7ba58 LPC |
788 | platform_set_drvdata(pdev, NULL); |
789 | kfree(di); | |
790 | ||
791 | return 0; | |
792 | } | |
793 | ||
794 | static struct platform_driver bq27000_battery_driver = { | |
795 | .probe = bq27000_battery_probe, | |
796 | .remove = __devexit_p(bq27000_battery_remove), | |
797 | .driver = { | |
798 | .name = "bq27000-battery", | |
799 | .owner = THIS_MODULE, | |
800 | }, | |
801 | }; | |
802 | ||
803 | static inline int bq27x00_battery_platform_init(void) | |
804 | { | |
805 | int ret = platform_driver_register(&bq27000_battery_driver); | |
806 | if (ret) | |
807 | printk(KERN_ERR "Unable to register BQ27000 platform driver\n"); | |
808 | ||
809 | return ret; | |
810 | } | |
811 | ||
812 | static inline void bq27x00_battery_platform_exit(void) | |
813 | { | |
814 | platform_driver_unregister(&bq27000_battery_driver); | |
815 | } | |
816 | ||
817 | #else | |
818 | ||
819 | static inline int bq27x00_battery_platform_init(void) { return 0; } | |
820 | static inline void bq27x00_battery_platform_exit(void) {}; | |
821 | ||
822 | #endif | |
823 | ||
824 | /* | |
825 | * Module stuff | |
826 | */ | |
827 | ||
b996ad0e RG |
828 | static int __init bq27x00_battery_init(void) |
829 | { | |
830 | int ret; | |
831 | ||
7fb7ba58 LPC |
832 | ret = bq27x00_battery_i2c_init(); |
833 | if (ret) | |
834 | return ret; | |
835 | ||
836 | ret = bq27x00_battery_platform_init(); | |
b996ad0e | 837 | if (ret) |
7fb7ba58 | 838 | bq27x00_battery_i2c_exit(); |
b996ad0e RG |
839 | |
840 | return ret; | |
841 | } | |
842 | module_init(bq27x00_battery_init); | |
843 | ||
844 | static void __exit bq27x00_battery_exit(void) | |
845 | { | |
7fb7ba58 LPC |
846 | bq27x00_battery_platform_exit(); |
847 | bq27x00_battery_i2c_exit(); | |
b996ad0e RG |
848 | } |
849 | module_exit(bq27x00_battery_exit); | |
850 | ||
851 | MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>"); | |
852 | MODULE_DESCRIPTION("BQ27x00 battery monitor driver"); | |
853 | MODULE_LICENSE("GPL"); |