Commit | Line | Data |
---|---|---|
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 | |
202e0116 | 50 | #define BQ27x00_REG_NAC 0x0C /* Nominal available capacity */ |
631c17ee PR |
51 | #define BQ27x00_REG_LMD 0x12 /* Last measured discharge */ |
52 | #define BQ27x00_REG_CYCT 0x2A /* Cycle count total */ | |
202e0116 | 53 | #define BQ27x00_REG_AE 0x22 /* Available energy */ |
b996ad0e | 54 | |
e20908d9 | 55 | #define BQ27000_REG_RSOC 0x0B /* Relative State-of-Charge */ |
631c17ee | 56 | #define BQ27000_REG_ILMD 0x76 /* Initial last measured discharge */ |
d66bab3f PR |
57 | #define BQ27000_FLAG_EDVF BIT(0) /* Final End-of-Discharge-Voltage flag */ |
58 | #define BQ27000_FLAG_EDV1 BIT(1) /* First End-of-Discharge-Voltage flag */ | |
4b226c2c | 59 | #define BQ27000_FLAG_CI BIT(4) /* Capacity Inaccurate flag */ |
c1b9ab67 | 60 | #define BQ27000_FLAG_FC BIT(5) |
d66bab3f | 61 | #define BQ27000_FLAG_CHGS BIT(7) /* Charge state flag */ |
e20908d9 | 62 | |
bf7d4140 | 63 | #define BQ27500_REG_SOC 0x2C |
631c17ee | 64 | #define BQ27500_REG_DCAP 0x3C /* Design capacity */ |
b7aaacf5 | 65 | #define BQ27500_FLAG_DSC BIT(0) |
d66bab3f PR |
66 | #define BQ27500_FLAG_SOCF BIT(1) /* State-of-Charge threshold final */ |
67 | #define BQ27500_FLAG_SOC1 BIT(2) /* State-of-Charge threshold 1 */ | |
b7aaacf5 | 68 | #define BQ27500_FLAG_FC BIT(9) |
e20908d9 | 69 | |
a2e5118c PR |
70 | #define BQ27000_RS 20 /* Resistor sense */ |
71 | ||
b996ad0e RG |
72 | struct bq27x00_device_info; |
73 | struct bq27x00_access_methods { | |
297a533b | 74 | int (*read)(struct bq27x00_device_info *di, u8 reg, bool single); |
b996ad0e RG |
75 | }; |
76 | ||
e20908d9 GI |
77 | enum bq27x00_chip { BQ27000, BQ27500 }; |
78 | ||
297a533b LPC |
79 | struct bq27x00_reg_cache { |
80 | int temperature; | |
81 | int time_to_empty; | |
82 | int time_to_empty_avg; | |
83 | int time_to_full; | |
631c17ee | 84 | int charge_full; |
73c244a8 | 85 | int cycle_count; |
297a533b | 86 | int capacity; |
a8f6bd23 | 87 | int energy; |
297a533b | 88 | int flags; |
297a533b LPC |
89 | }; |
90 | ||
b996ad0e RG |
91 | struct bq27x00_device_info { |
92 | struct device *dev; | |
93 | int id; | |
e20908d9 | 94 | enum bq27x00_chip chip; |
b996ad0e | 95 | |
297a533b | 96 | struct bq27x00_reg_cache cache; |
631c17ee PR |
97 | int charge_design_full; |
98 | ||
297a533b | 99 | unsigned long last_update; |
740b755a | 100 | struct delayed_work work; |
297a533b | 101 | |
a40402ef LPC |
102 | struct power_supply bat; |
103 | ||
104 | struct bq27x00_access_methods bus; | |
740b755a LPC |
105 | |
106 | struct mutex lock; | |
b996ad0e RG |
107 | }; |
108 | ||
109 | static enum power_supply_property bq27x00_battery_props[] = { | |
4e924a81 | 110 | POWER_SUPPLY_PROP_STATUS, |
b996ad0e RG |
111 | POWER_SUPPLY_PROP_PRESENT, |
112 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
113 | POWER_SUPPLY_PROP_CURRENT_NOW, | |
114 | POWER_SUPPLY_PROP_CAPACITY, | |
d66bab3f | 115 | POWER_SUPPLY_PROP_CAPACITY_LEVEL, |
b996ad0e | 116 | POWER_SUPPLY_PROP_TEMP, |
4e924a81 GI |
117 | POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW, |
118 | POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, | |
119 | POWER_SUPPLY_PROP_TIME_TO_FULL_NOW, | |
5661f334 | 120 | POWER_SUPPLY_PROP_TECHNOLOGY, |
631c17ee PR |
121 | POWER_SUPPLY_PROP_CHARGE_FULL, |
122 | POWER_SUPPLY_PROP_CHARGE_NOW, | |
123 | POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, | |
73c244a8 | 124 | POWER_SUPPLY_PROP_CYCLE_COUNT, |
631c17ee | 125 | POWER_SUPPLY_PROP_ENERGY_NOW, |
b996ad0e RG |
126 | }; |
127 | ||
740b755a LPC |
128 | static unsigned int poll_interval = 360; |
129 | module_param(poll_interval, uint, 0644); | |
130 | MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \ | |
131 | "0 disables polling"); | |
132 | ||
b996ad0e RG |
133 | /* |
134 | * Common code for BQ27x00 devices | |
135 | */ | |
136 | ||
a40402ef | 137 | static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg, |
297a533b | 138 | bool single) |
b996ad0e | 139 | { |
297a533b | 140 | return di->bus.read(di, reg, single); |
b996ad0e RG |
141 | } |
142 | ||
143 | /* | |
297a533b | 144 | * Return the battery Relative State-of-Charge |
b996ad0e RG |
145 | * Or < 0 if something fails. |
146 | */ | |
297a533b | 147 | static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di) |
b996ad0e | 148 | { |
297a533b | 149 | int rsoc; |
b996ad0e | 150 | |
e20908d9 | 151 | if (di->chip == BQ27500) |
297a533b | 152 | rsoc = bq27x00_read(di, BQ27500_REG_SOC, false); |
e20908d9 | 153 | else |
297a533b LPC |
154 | rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true); |
155 | ||
156 | if (rsoc < 0) | |
c6cd4f26 | 157 | dev_dbg(di->dev, "error reading relative State-of-Charge\n"); |
297a533b LPC |
158 | |
159 | return rsoc; | |
b996ad0e RG |
160 | } |
161 | ||
631c17ee PR |
162 | /* |
163 | * Return a battery charge value in µAh | |
164 | * Or < 0 if something fails. | |
165 | */ | |
166 | static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg) | |
167 | { | |
168 | int charge; | |
169 | ||
170 | charge = bq27x00_read(di, reg, false); | |
171 | if (charge < 0) { | |
c6cd4f26 PR |
172 | dev_dbg(di->dev, "error reading charge register %02x: %d\n", |
173 | reg, charge); | |
631c17ee PR |
174 | return charge; |
175 | } | |
176 | ||
177 | if (di->chip == BQ27500) | |
178 | charge *= 1000; | |
179 | else | |
180 | charge = charge * 3570 / BQ27000_RS; | |
181 | ||
182 | return charge; | |
183 | } | |
184 | ||
185 | /* | |
186 | * Return the battery Nominal available capaciy in µAh | |
187 | * Or < 0 if something fails. | |
188 | */ | |
189 | static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di) | |
190 | { | |
191 | return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC); | |
192 | } | |
193 | ||
194 | /* | |
195 | * Return the battery Last measured discharge in µAh | |
196 | * Or < 0 if something fails. | |
197 | */ | |
198 | static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di) | |
199 | { | |
200 | return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD); | |
201 | } | |
202 | ||
203 | /* | |
204 | * Return the battery Initial last measured discharge in µAh | |
205 | * Or < 0 if something fails. | |
206 | */ | |
207 | static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di) | |
208 | { | |
209 | int ilmd; | |
210 | ||
211 | if (di->chip == BQ27500) | |
212 | ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false); | |
213 | else | |
214 | ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true); | |
215 | ||
216 | if (ilmd < 0) { | |
c6cd4f26 | 217 | dev_dbg(di->dev, "error reading initial last measured discharge\n"); |
631c17ee PR |
218 | return ilmd; |
219 | } | |
220 | ||
221 | if (di->chip == BQ27500) | |
222 | ilmd *= 1000; | |
223 | else | |
224 | ilmd = ilmd * 256 * 3570 / BQ27000_RS; | |
225 | ||
226 | return ilmd; | |
227 | } | |
228 | ||
a8f6bd23 PR |
229 | /* |
230 | * Return the battery Available energy in µWh | |
231 | * Or < 0 if something fails. | |
232 | */ | |
233 | static int bq27x00_battery_read_energy(struct bq27x00_device_info *di) | |
234 | { | |
235 | int ae; | |
236 | ||
237 | ae = bq27x00_read(di, BQ27x00_REG_AE, false); | |
238 | if (ae < 0) { | |
c6cd4f26 | 239 | dev_dbg(di->dev, "error reading available energy\n"); |
a8f6bd23 PR |
240 | return ae; |
241 | } | |
242 | ||
243 | if (di->chip == BQ27500) | |
244 | ae *= 1000; | |
245 | else | |
246 | ae = ae * 29200 / BQ27000_RS; | |
247 | ||
248 | return ae; | |
249 | } | |
250 | ||
d149e98e PR |
251 | /* |
252 | * Return the battery temperature in tenths of degree Celsius | |
253 | * Or < 0 if something fails. | |
254 | */ | |
255 | static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di) | |
256 | { | |
257 | int temp; | |
258 | ||
259 | temp = bq27x00_read(di, BQ27x00_REG_TEMP, false); | |
260 | if (temp < 0) { | |
261 | dev_err(di->dev, "error reading temperature\n"); | |
262 | return temp; | |
263 | } | |
264 | ||
265 | if (di->chip == BQ27500) | |
266 | temp -= 2731; | |
267 | else | |
268 | temp = ((temp * 5) - 5463) / 2; | |
269 | ||
270 | return temp; | |
271 | } | |
272 | ||
631c17ee PR |
273 | /* |
274 | * Return the battery Cycle count total | |
275 | * Or < 0 if something fails. | |
276 | */ | |
277 | static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di) | |
278 | { | |
279 | int cyct; | |
280 | ||
281 | cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false); | |
282 | if (cyct < 0) | |
283 | dev_err(di->dev, "error reading cycle count total\n"); | |
284 | ||
285 | return cyct; | |
286 | } | |
287 | ||
b996ad0e | 288 | /* |
297a533b LPC |
289 | * Read a time register. |
290 | * Return < 0 if something fails. | |
b996ad0e | 291 | */ |
297a533b | 292 | static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg) |
b996ad0e | 293 | { |
297a533b | 294 | int tval; |
b996ad0e | 295 | |
297a533b LPC |
296 | tval = bq27x00_read(di, reg, false); |
297 | if (tval < 0) { | |
c6cd4f26 PR |
298 | dev_dbg(di->dev, "error reading time register %02x: %d\n", |
299 | reg, tval); | |
297a533b | 300 | return tval; |
b996ad0e RG |
301 | } |
302 | ||
297a533b LPC |
303 | if (tval == 65535) |
304 | return -ENODATA; | |
305 | ||
306 | return tval * 60; | |
307 | } | |
308 | ||
309 | static void bq27x00_update(struct bq27x00_device_info *di) | |
310 | { | |
311 | struct bq27x00_reg_cache cache = {0, }; | |
312 | bool is_bq27500 = di->chip == BQ27500; | |
313 | ||
4d403659 | 314 | cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500); |
297a533b | 315 | if (cache.flags >= 0) { |
4b226c2c | 316 | if (!is_bq27500 && (cache.flags & BQ27000_FLAG_CI)) { |
c6cd4f26 | 317 | dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n"); |
4b226c2c | 318 | cache.capacity = -ENODATA; |
a8f6bd23 | 319 | cache.energy = -ENODATA; |
4b226c2c PR |
320 | cache.time_to_empty = -ENODATA; |
321 | cache.time_to_empty_avg = -ENODATA; | |
322 | cache.time_to_full = -ENODATA; | |
323 | cache.charge_full = -ENODATA; | |
324 | } else { | |
325 | cache.capacity = bq27x00_battery_read_rsoc(di); | |
a8f6bd23 | 326 | cache.energy = bq27x00_battery_read_energy(di); |
4b226c2c PR |
327 | cache.time_to_empty = bq27x00_battery_read_time(di, BQ27x00_REG_TTE); |
328 | cache.time_to_empty_avg = bq27x00_battery_read_time(di, BQ27x00_REG_TTECP); | |
329 | cache.time_to_full = bq27x00_battery_read_time(di, BQ27x00_REG_TTF); | |
330 | cache.charge_full = bq27x00_battery_read_lmd(di); | |
331 | } | |
d149e98e | 332 | cache.temperature = bq27x00_battery_read_temperature(di); |
73c244a8 | 333 | cache.cycle_count = bq27x00_battery_read_cyct(di); |
297a533b | 334 | |
631c17ee PR |
335 | /* We only have to read charge design full once */ |
336 | if (di->charge_design_full <= 0) | |
337 | di->charge_design_full = bq27x00_battery_read_ilmd(di); | |
297a533b LPC |
338 | } |
339 | ||
b68f6216 | 340 | if (memcmp(&di->cache, &cache, sizeof(cache)) != 0) { |
297a533b LPC |
341 | di->cache = cache; |
342 | power_supply_changed(&di->bat); | |
343 | } | |
344 | ||
345 | di->last_update = jiffies; | |
346 | } | |
347 | ||
740b755a LPC |
348 | static void bq27x00_battery_poll(struct work_struct *work) |
349 | { | |
350 | struct bq27x00_device_info *di = | |
351 | container_of(work, struct bq27x00_device_info, work.work); | |
352 | ||
353 | bq27x00_update(di); | |
354 | ||
355 | if (poll_interval > 0) { | |
356 | /* The timer does not have to be accurate. */ | |
357 | set_timer_slack(&di->work.timer, poll_interval * HZ / 4); | |
358 | schedule_delayed_work(&di->work, poll_interval * HZ); | |
359 | } | |
360 | } | |
361 | ||
b996ad0e | 362 | /* |
bf7d4140 | 363 | * Return the battery average current in µA |
b996ad0e RG |
364 | * Note that current can be negative signed as well |
365 | * Or 0 if something fails. | |
366 | */ | |
297a533b LPC |
367 | static int bq27x00_battery_current(struct bq27x00_device_info *di, |
368 | union power_supply_propval *val) | |
b996ad0e | 369 | { |
297a533b | 370 | int curr; |
b68f6216 | 371 | int flags; |
b996ad0e | 372 | |
b68f6216 | 373 | curr = bq27x00_read(di, BQ27x00_REG_AI, false); |
c6cd4f26 PR |
374 | if (curr < 0) { |
375 | dev_err(di->dev, "error reading current\n"); | |
297a533b | 376 | return curr; |
c6cd4f26 | 377 | } |
e20908d9 GI |
378 | |
379 | if (di->chip == BQ27500) { | |
380 | /* bq27500 returns signed value */ | |
297a533b | 381 | val->intval = (int)((s16)curr) * 1000; |
e20908d9 | 382 | } else { |
b68f6216 PR |
383 | flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false); |
384 | if (flags & BQ27000_FLAG_CHGS) { | |
e20908d9 | 385 | dev_dbg(di->dev, "negative current!\n"); |
afbc74fd | 386 | curr = -curr; |
e20908d9 | 387 | } |
b996ad0e | 388 | |
297a533b | 389 | val->intval = curr * 3570 / BQ27000_RS; |
b996ad0e RG |
390 | } |
391 | ||
297a533b | 392 | return 0; |
b996ad0e RG |
393 | } |
394 | ||
4e924a81 | 395 | static int bq27x00_battery_status(struct bq27x00_device_info *di, |
297a533b | 396 | union power_supply_propval *val) |
4e924a81 | 397 | { |
4e924a81 | 398 | int status; |
4e924a81 GI |
399 | |
400 | if (di->chip == BQ27500) { | |
297a533b | 401 | if (di->cache.flags & BQ27500_FLAG_FC) |
4e924a81 | 402 | status = POWER_SUPPLY_STATUS_FULL; |
b7aaacf5 | 403 | else if (di->cache.flags & BQ27500_FLAG_DSC) |
4e924a81 | 404 | status = POWER_SUPPLY_STATUS_DISCHARGING; |
270968c0 | 405 | else |
b7aaacf5 | 406 | status = POWER_SUPPLY_STATUS_CHARGING; |
4e924a81 | 407 | } else { |
c1b9ab67 LPC |
408 | if (di->cache.flags & BQ27000_FLAG_FC) |
409 | status = POWER_SUPPLY_STATUS_FULL; | |
410 | else if (di->cache.flags & BQ27000_FLAG_CHGS) | |
4e924a81 | 411 | status = POWER_SUPPLY_STATUS_CHARGING; |
c1b9ab67 LPC |
412 | else if (power_supply_am_i_supplied(&di->bat)) |
413 | status = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
4e924a81 GI |
414 | else |
415 | status = POWER_SUPPLY_STATUS_DISCHARGING; | |
416 | } | |
417 | ||
418 | val->intval = status; | |
297a533b | 419 | |
4e924a81 GI |
420 | return 0; |
421 | } | |
422 | ||
d66bab3f PR |
423 | static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di, |
424 | union power_supply_propval *val) | |
425 | { | |
426 | int level; | |
427 | ||
428 | if (di->chip == BQ27500) { | |
429 | if (di->cache.flags & BQ27500_FLAG_FC) | |
430 | level = POWER_SUPPLY_CAPACITY_LEVEL_FULL; | |
431 | else if (di->cache.flags & BQ27500_FLAG_SOC1) | |
432 | level = POWER_SUPPLY_CAPACITY_LEVEL_LOW; | |
433 | else if (di->cache.flags & BQ27500_FLAG_SOCF) | |
434 | level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; | |
435 | else | |
436 | level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; | |
437 | } else { | |
438 | if (di->cache.flags & BQ27000_FLAG_FC) | |
439 | level = POWER_SUPPLY_CAPACITY_LEVEL_FULL; | |
440 | else if (di->cache.flags & BQ27000_FLAG_EDV1) | |
441 | level = POWER_SUPPLY_CAPACITY_LEVEL_LOW; | |
442 | else if (di->cache.flags & BQ27000_FLAG_EDVF) | |
443 | level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; | |
444 | else | |
445 | level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; | |
446 | } | |
447 | ||
448 | val->intval = level; | |
449 | ||
450 | return 0; | |
451 | } | |
452 | ||
4e924a81 | 453 | /* |
91fe4d50 | 454 | * Return the battery Voltage in millivolts |
297a533b | 455 | * Or < 0 if something fails. |
4e924a81 | 456 | */ |
297a533b LPC |
457 | static int bq27x00_battery_voltage(struct bq27x00_device_info *di, |
458 | union power_supply_propval *val) | |
4e924a81 | 459 | { |
297a533b | 460 | int volt; |
4e924a81 | 461 | |
297a533b | 462 | volt = bq27x00_read(di, BQ27x00_REG_VOLT, false); |
c6cd4f26 PR |
463 | if (volt < 0) { |
464 | dev_err(di->dev, "error reading voltage\n"); | |
297a533b | 465 | return volt; |
c6cd4f26 | 466 | } |
4e924a81 | 467 | |
297a533b LPC |
468 | val->intval = volt * 1000; |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
473 | static int bq27x00_simple_value(int value, | |
474 | union power_supply_propval *val) | |
475 | { | |
476 | if (value < 0) | |
477 | return value; | |
478 | ||
479 | val->intval = value; | |
4e924a81 | 480 | |
4e924a81 GI |
481 | return 0; |
482 | } | |
483 | ||
b996ad0e RG |
484 | #define to_bq27x00_device_info(x) container_of((x), \ |
485 | struct bq27x00_device_info, bat); | |
486 | ||
487 | static int bq27x00_battery_get_property(struct power_supply *psy, | |
488 | enum power_supply_property psp, | |
489 | union power_supply_propval *val) | |
490 | { | |
4e924a81 | 491 | int ret = 0; |
b996ad0e | 492 | struct bq27x00_device_info *di = to_bq27x00_device_info(psy); |
3413b4ea | 493 | |
740b755a LPC |
494 | mutex_lock(&di->lock); |
495 | if (time_is_before_jiffies(di->last_update + 5 * HZ)) { | |
496 | cancel_delayed_work_sync(&di->work); | |
497 | bq27x00_battery_poll(&di->work.work); | |
498 | } | |
499 | mutex_unlock(&di->lock); | |
297a533b LPC |
500 | |
501 | if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0) | |
3413b4ea | 502 | return -ENODEV; |
b996ad0e RG |
503 | |
504 | switch (psp) { | |
4e924a81 GI |
505 | case POWER_SUPPLY_PROP_STATUS: |
506 | ret = bq27x00_battery_status(di, val); | |
507 | break; | |
b996ad0e | 508 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
297a533b | 509 | ret = bq27x00_battery_voltage(di, val); |
3413b4ea | 510 | break; |
b996ad0e | 511 | case POWER_SUPPLY_PROP_PRESENT: |
297a533b | 512 | val->intval = di->cache.flags < 0 ? 0 : 1; |
b996ad0e RG |
513 | break; |
514 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
297a533b | 515 | ret = bq27x00_battery_current(di, val); |
b996ad0e RG |
516 | break; |
517 | case POWER_SUPPLY_PROP_CAPACITY: | |
297a533b | 518 | ret = bq27x00_simple_value(di->cache.capacity, val); |
b996ad0e | 519 | break; |
d66bab3f PR |
520 | case POWER_SUPPLY_PROP_CAPACITY_LEVEL: |
521 | ret = bq27x00_battery_capacity_level(di, val); | |
522 | break; | |
b996ad0e | 523 | case POWER_SUPPLY_PROP_TEMP: |
d149e98e | 524 | ret = bq27x00_simple_value(di->cache.temperature, val); |
b996ad0e | 525 | break; |
4e924a81 | 526 | case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW: |
297a533b | 527 | ret = bq27x00_simple_value(di->cache.time_to_empty, val); |
4e924a81 GI |
528 | break; |
529 | case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG: | |
297a533b | 530 | ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val); |
4e924a81 GI |
531 | break; |
532 | case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW: | |
297a533b | 533 | ret = bq27x00_simple_value(di->cache.time_to_full, val); |
4e924a81 | 534 | break; |
5661f334 LPC |
535 | case POWER_SUPPLY_PROP_TECHNOLOGY: |
536 | val->intval = POWER_SUPPLY_TECHNOLOGY_LION; | |
537 | break; | |
631c17ee PR |
538 | case POWER_SUPPLY_PROP_CHARGE_NOW: |
539 | ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val); | |
540 | break; | |
541 | case POWER_SUPPLY_PROP_CHARGE_FULL: | |
542 | ret = bq27x00_simple_value(di->cache.charge_full, val); | |
543 | break; | |
544 | case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: | |
545 | ret = bq27x00_simple_value(di->charge_design_full, val); | |
546 | break; | |
73c244a8 PR |
547 | case POWER_SUPPLY_PROP_CYCLE_COUNT: |
548 | ret = bq27x00_simple_value(di->cache.cycle_count, val); | |
631c17ee PR |
549 | break; |
550 | case POWER_SUPPLY_PROP_ENERGY_NOW: | |
a8f6bd23 | 551 | ret = bq27x00_simple_value(di->cache.energy, val); |
631c17ee | 552 | break; |
b996ad0e RG |
553 | default: |
554 | return -EINVAL; | |
555 | } | |
556 | ||
4e924a81 | 557 | return ret; |
b996ad0e RG |
558 | } |
559 | ||
740b755a LPC |
560 | static void bq27x00_external_power_changed(struct power_supply *psy) |
561 | { | |
562 | struct bq27x00_device_info *di = to_bq27x00_device_info(psy); | |
563 | ||
564 | cancel_delayed_work_sync(&di->work); | |
565 | schedule_delayed_work(&di->work, 0); | |
566 | } | |
567 | ||
a40402ef | 568 | static int bq27x00_powersupply_init(struct bq27x00_device_info *di) |
b996ad0e | 569 | { |
a40402ef LPC |
570 | int ret; |
571 | ||
b996ad0e RG |
572 | di->bat.type = POWER_SUPPLY_TYPE_BATTERY; |
573 | di->bat.properties = bq27x00_battery_props; | |
574 | di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props); | |
575 | di->bat.get_property = bq27x00_battery_get_property; | |
740b755a LPC |
576 | di->bat.external_power_changed = bq27x00_external_power_changed; |
577 | ||
578 | INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll); | |
579 | mutex_init(&di->lock); | |
a40402ef LPC |
580 | |
581 | ret = power_supply_register(di->dev, &di->bat); | |
582 | if (ret) { | |
583 | dev_err(di->dev, "failed to register battery: %d\n", ret); | |
584 | return ret; | |
585 | } | |
586 | ||
587 | dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION); | |
588 | ||
297a533b LPC |
589 | bq27x00_update(di); |
590 | ||
a40402ef | 591 | return 0; |
b996ad0e RG |
592 | } |
593 | ||
740b755a LPC |
594 | static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di) |
595 | { | |
8cfaaa81 PR |
596 | /* |
597 | * power_supply_unregister call bq27x00_battery_get_property which | |
598 | * call bq27x00_battery_poll. | |
599 | * Make sure that bq27x00_battery_poll will not call | |
600 | * schedule_delayed_work again after unregister (which cause OOPS). | |
601 | */ | |
602 | poll_interval = 0; | |
603 | ||
740b755a LPC |
604 | cancel_delayed_work_sync(&di->work); |
605 | ||
606 | power_supply_unregister(&di->bat); | |
607 | ||
608 | mutex_destroy(&di->lock); | |
609 | } | |
610 | ||
7fb7ba58 LPC |
611 | |
612 | /* i2c specific code */ | |
613 | #ifdef CONFIG_BATTERY_BQ27X00_I2C | |
614 | ||
615 | /* If the system has several batteries we need a different name for each | |
616 | * of them... | |
b996ad0e | 617 | */ |
7fb7ba58 LPC |
618 | static DEFINE_IDR(battery_id); |
619 | static DEFINE_MUTEX(battery_mutex); | |
b996ad0e | 620 | |
297a533b | 621 | static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single) |
b996ad0e | 622 | { |
a40402ef | 623 | struct i2c_client *client = to_i2c_client(di->dev); |
9e912f45 | 624 | struct i2c_msg msg[2]; |
b996ad0e | 625 | unsigned char data[2]; |
297a533b | 626 | int ret; |
b996ad0e RG |
627 | |
628 | if (!client->adapter) | |
629 | return -ENODEV; | |
630 | ||
9e912f45 GI |
631 | msg[0].addr = client->addr; |
632 | msg[0].flags = 0; | |
633 | msg[0].buf = ® | |
634 | msg[0].len = sizeof(reg); | |
635 | msg[1].addr = client->addr; | |
636 | msg[1].flags = I2C_M_RD; | |
637 | msg[1].buf = data; | |
2ec523a8 | 638 | if (single) |
9e912f45 | 639 | msg[1].len = 1; |
2ec523a8 | 640 | else |
9e912f45 | 641 | msg[1].len = 2; |
2ec523a8 | 642 | |
9e912f45 | 643 | ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg)); |
2ec523a8 LPC |
644 | if (ret < 0) |
645 | return ret; | |
646 | ||
647 | if (!single) | |
648 | ret = get_unaligned_le16(data); | |
649 | else | |
650 | ret = data[0]; | |
b996ad0e | 651 | |
297a533b | 652 | return ret; |
b996ad0e RG |
653 | } |
654 | ||
e20908d9 | 655 | static int bq27x00_battery_probe(struct i2c_client *client, |
b996ad0e RG |
656 | const struct i2c_device_id *id) |
657 | { | |
658 | char *name; | |
659 | struct bq27x00_device_info *di; | |
b996ad0e RG |
660 | int num; |
661 | int retval = 0; | |
662 | ||
663 | /* Get new ID for the new battery device */ | |
664 | retval = idr_pre_get(&battery_id, GFP_KERNEL); | |
665 | if (retval == 0) | |
666 | return -ENOMEM; | |
667 | mutex_lock(&battery_mutex); | |
668 | retval = idr_get_new(&battery_id, client, &num); | |
669 | mutex_unlock(&battery_mutex); | |
670 | if (retval < 0) | |
671 | return retval; | |
672 | ||
e20908d9 | 673 | name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num); |
b996ad0e RG |
674 | if (!name) { |
675 | dev_err(&client->dev, "failed to allocate device name\n"); | |
676 | retval = -ENOMEM; | |
677 | goto batt_failed_1; | |
678 | } | |
679 | ||
680 | di = kzalloc(sizeof(*di), GFP_KERNEL); | |
681 | if (!di) { | |
682 | dev_err(&client->dev, "failed to allocate device info data\n"); | |
683 | retval = -ENOMEM; | |
684 | goto batt_failed_2; | |
685 | } | |
a40402ef | 686 | |
b996ad0e | 687 | di->id = num; |
a40402ef | 688 | di->dev = &client->dev; |
e20908d9 | 689 | di->chip = id->driver_data; |
a40402ef LPC |
690 | di->bat.name = name; |
691 | di->bus.read = &bq27x00_read_i2c; | |
b996ad0e | 692 | |
a40402ef | 693 | if (bq27x00_powersupply_init(di)) |
b996ad0e | 694 | goto batt_failed_3; |
b996ad0e RG |
695 | |
696 | i2c_set_clientdata(client, di); | |
b996ad0e RG |
697 | |
698 | return 0; | |
699 | ||
b996ad0e RG |
700 | batt_failed_3: |
701 | kfree(di); | |
702 | batt_failed_2: | |
703 | kfree(name); | |
704 | batt_failed_1: | |
705 | mutex_lock(&battery_mutex); | |
706 | idr_remove(&battery_id, num); | |
707 | mutex_unlock(&battery_mutex); | |
708 | ||
709 | return retval; | |
710 | } | |
711 | ||
e20908d9 | 712 | static int bq27x00_battery_remove(struct i2c_client *client) |
b996ad0e RG |
713 | { |
714 | struct bq27x00_device_info *di = i2c_get_clientdata(client); | |
715 | ||
740b755a | 716 | bq27x00_powersupply_unregister(di); |
b996ad0e RG |
717 | |
718 | kfree(di->bat.name); | |
719 | ||
720 | mutex_lock(&battery_mutex); | |
721 | idr_remove(&battery_id, di->id); | |
722 | mutex_unlock(&battery_mutex); | |
723 | ||
724 | kfree(di); | |
725 | ||
726 | return 0; | |
727 | } | |
728 | ||
e20908d9 GI |
729 | static const struct i2c_device_id bq27x00_id[] = { |
730 | { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */ | |
731 | { "bq27500", BQ27500 }, | |
b996ad0e RG |
732 | {}, |
733 | }; | |
fd9b958c | 734 | MODULE_DEVICE_TABLE(i2c, bq27x00_id); |
b996ad0e | 735 | |
e20908d9 | 736 | static struct i2c_driver bq27x00_battery_driver = { |
b996ad0e | 737 | .driver = { |
e20908d9 | 738 | .name = "bq27x00-battery", |
b996ad0e | 739 | }, |
e20908d9 GI |
740 | .probe = bq27x00_battery_probe, |
741 | .remove = bq27x00_battery_remove, | |
742 | .id_table = bq27x00_id, | |
b996ad0e RG |
743 | }; |
744 | ||
7fb7ba58 LPC |
745 | static inline int bq27x00_battery_i2c_init(void) |
746 | { | |
747 | int ret = i2c_add_driver(&bq27x00_battery_driver); | |
748 | if (ret) | |
749 | printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n"); | |
750 | ||
751 | return ret; | |
752 | } | |
753 | ||
754 | static inline void bq27x00_battery_i2c_exit(void) | |
755 | { | |
756 | i2c_del_driver(&bq27x00_battery_driver); | |
757 | } | |
758 | ||
759 | #else | |
760 | ||
761 | static inline int bq27x00_battery_i2c_init(void) { return 0; } | |
762 | static inline void bq27x00_battery_i2c_exit(void) {}; | |
763 | ||
764 | #endif | |
765 | ||
766 | /* platform specific code */ | |
767 | #ifdef CONFIG_BATTERY_BQ27X00_PLATFORM | |
768 | ||
769 | static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg, | |
297a533b | 770 | bool single) |
7fb7ba58 LPC |
771 | { |
772 | struct device *dev = di->dev; | |
773 | struct bq27000_platform_data *pdata = dev->platform_data; | |
774 | unsigned int timeout = 3; | |
775 | int upper, lower; | |
776 | int temp; | |
777 | ||
778 | if (!single) { | |
779 | /* Make sure the value has not changed in between reading the | |
780 | * lower and the upper part */ | |
781 | upper = pdata->read(dev, reg + 1); | |
782 | do { | |
783 | temp = upper; | |
784 | if (upper < 0) | |
785 | return upper; | |
786 | ||
787 | lower = pdata->read(dev, reg); | |
788 | if (lower < 0) | |
789 | return lower; | |
790 | ||
791 | upper = pdata->read(dev, reg + 1); | |
792 | } while (temp != upper && --timeout); | |
793 | ||
794 | if (timeout == 0) | |
795 | return -EIO; | |
796 | ||
297a533b | 797 | return (upper << 8) | lower; |
7fb7ba58 | 798 | } |
297a533b LPC |
799 | |
800 | return pdata->read(dev, reg); | |
7fb7ba58 LPC |
801 | } |
802 | ||
803 | static int __devinit bq27000_battery_probe(struct platform_device *pdev) | |
804 | { | |
805 | struct bq27x00_device_info *di; | |
806 | struct bq27000_platform_data *pdata = pdev->dev.platform_data; | |
807 | int ret; | |
808 | ||
809 | if (!pdata) { | |
810 | dev_err(&pdev->dev, "no platform_data supplied\n"); | |
811 | return -EINVAL; | |
812 | } | |
813 | ||
814 | if (!pdata->read) { | |
815 | dev_err(&pdev->dev, "no hdq read callback supplied\n"); | |
816 | return -EINVAL; | |
817 | } | |
818 | ||
819 | di = kzalloc(sizeof(*di), GFP_KERNEL); | |
820 | if (!di) { | |
821 | dev_err(&pdev->dev, "failed to allocate device info data\n"); | |
822 | return -ENOMEM; | |
823 | } | |
824 | ||
825 | platform_set_drvdata(pdev, di); | |
826 | ||
827 | di->dev = &pdev->dev; | |
828 | di->chip = BQ27000; | |
829 | ||
830 | di->bat.name = pdata->name ?: dev_name(&pdev->dev); | |
831 | di->bus.read = &bq27000_read_platform; | |
832 | ||
833 | ret = bq27x00_powersupply_init(di); | |
834 | if (ret) | |
835 | goto err_free; | |
836 | ||
837 | return 0; | |
838 | ||
839 | err_free: | |
840 | platform_set_drvdata(pdev, NULL); | |
841 | kfree(di); | |
842 | ||
843 | return ret; | |
844 | } | |
845 | ||
846 | static int __devexit bq27000_battery_remove(struct platform_device *pdev) | |
847 | { | |
848 | struct bq27x00_device_info *di = platform_get_drvdata(pdev); | |
849 | ||
740b755a LPC |
850 | bq27x00_powersupply_unregister(di); |
851 | ||
7fb7ba58 LPC |
852 | platform_set_drvdata(pdev, NULL); |
853 | kfree(di); | |
854 | ||
855 | return 0; | |
856 | } | |
857 | ||
858 | static struct platform_driver bq27000_battery_driver = { | |
859 | .probe = bq27000_battery_probe, | |
860 | .remove = __devexit_p(bq27000_battery_remove), | |
861 | .driver = { | |
862 | .name = "bq27000-battery", | |
863 | .owner = THIS_MODULE, | |
864 | }, | |
865 | }; | |
866 | ||
867 | static inline int bq27x00_battery_platform_init(void) | |
868 | { | |
869 | int ret = platform_driver_register(&bq27000_battery_driver); | |
870 | if (ret) | |
871 | printk(KERN_ERR "Unable to register BQ27000 platform driver\n"); | |
872 | ||
873 | return ret; | |
874 | } | |
875 | ||
876 | static inline void bq27x00_battery_platform_exit(void) | |
877 | { | |
878 | platform_driver_unregister(&bq27000_battery_driver); | |
879 | } | |
880 | ||
881 | #else | |
882 | ||
883 | static inline int bq27x00_battery_platform_init(void) { return 0; } | |
884 | static inline void bq27x00_battery_platform_exit(void) {}; | |
885 | ||
886 | #endif | |
887 | ||
888 | /* | |
889 | * Module stuff | |
890 | */ | |
891 | ||
b996ad0e RG |
892 | static int __init bq27x00_battery_init(void) |
893 | { | |
894 | int ret; | |
895 | ||
7fb7ba58 LPC |
896 | ret = bq27x00_battery_i2c_init(); |
897 | if (ret) | |
898 | return ret; | |
899 | ||
900 | ret = bq27x00_battery_platform_init(); | |
b996ad0e | 901 | if (ret) |
7fb7ba58 | 902 | bq27x00_battery_i2c_exit(); |
b996ad0e RG |
903 | |
904 | return ret; | |
905 | } | |
906 | module_init(bq27x00_battery_init); | |
907 | ||
908 | static void __exit bq27x00_battery_exit(void) | |
909 | { | |
7fb7ba58 LPC |
910 | bq27x00_battery_platform_exit(); |
911 | bq27x00_battery_i2c_exit(); | |
b996ad0e RG |
912 | } |
913 | module_exit(bq27x00_battery_exit); | |
914 | ||
915 | MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>"); | |
916 | MODULE_DESCRIPTION("BQ27x00 battery monitor driver"); | |
917 | MODULE_LICENSE("GPL"); |