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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 */ |
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 */ |
270968c0 | 65 | #define BQ27500_FLAG_DSG BIT(0) /* Discharging */ |
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 */ | |
270968c0 PR |
68 | #define BQ27500_FLAG_CHG BIT(8) /* Charging */ |
69 | #define BQ27500_FLAG_FC BIT(9) /* Fully charged */ | |
e20908d9 | 70 | |
a2e5118c PR |
71 | #define BQ27000_RS 20 /* Resistor sense */ |
72 | ||
b996ad0e RG |
73 | struct bq27x00_device_info; |
74 | struct bq27x00_access_methods { | |
297a533b | 75 | int (*read)(struct bq27x00_device_info *di, u8 reg, bool single); |
b996ad0e RG |
76 | }; |
77 | ||
e20908d9 GI |
78 | enum bq27x00_chip { BQ27000, BQ27500 }; |
79 | ||
297a533b LPC |
80 | struct bq27x00_reg_cache { |
81 | int temperature; | |
82 | int time_to_empty; | |
83 | int time_to_empty_avg; | |
84 | int time_to_full; | |
631c17ee | 85 | int charge_full; |
73c244a8 | 86 | int cycle_count; |
297a533b | 87 | int capacity; |
a8f6bd23 | 88 | int energy; |
297a533b | 89 | int flags; |
297a533b LPC |
90 | }; |
91 | ||
b996ad0e RG |
92 | struct bq27x00_device_info { |
93 | struct device *dev; | |
94 | int id; | |
e20908d9 | 95 | enum bq27x00_chip chip; |
b996ad0e | 96 | |
297a533b | 97 | struct bq27x00_reg_cache cache; |
631c17ee PR |
98 | int charge_design_full; |
99 | ||
297a533b | 100 | unsigned long last_update; |
740b755a | 101 | struct delayed_work work; |
297a533b | 102 | |
a40402ef LPC |
103 | struct power_supply bat; |
104 | ||
105 | struct bq27x00_access_methods bus; | |
740b755a LPC |
106 | |
107 | struct mutex lock; | |
b996ad0e RG |
108 | }; |
109 | ||
110 | static enum power_supply_property bq27x00_battery_props[] = { | |
4e924a81 | 111 | POWER_SUPPLY_PROP_STATUS, |
b996ad0e RG |
112 | POWER_SUPPLY_PROP_PRESENT, |
113 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
114 | POWER_SUPPLY_PROP_CURRENT_NOW, | |
115 | POWER_SUPPLY_PROP_CAPACITY, | |
d66bab3f | 116 | POWER_SUPPLY_PROP_CAPACITY_LEVEL, |
b996ad0e | 117 | POWER_SUPPLY_PROP_TEMP, |
4e924a81 GI |
118 | POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW, |
119 | POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, | |
120 | POWER_SUPPLY_PROP_TIME_TO_FULL_NOW, | |
5661f334 | 121 | POWER_SUPPLY_PROP_TECHNOLOGY, |
631c17ee PR |
122 | POWER_SUPPLY_PROP_CHARGE_FULL, |
123 | POWER_SUPPLY_PROP_CHARGE_NOW, | |
124 | POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, | |
73c244a8 | 125 | POWER_SUPPLY_PROP_CYCLE_COUNT, |
631c17ee | 126 | POWER_SUPPLY_PROP_ENERGY_NOW, |
b996ad0e RG |
127 | }; |
128 | ||
740b755a LPC |
129 | static unsigned int poll_interval = 360; |
130 | module_param(poll_interval, uint, 0644); | |
131 | MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \ | |
132 | "0 disables polling"); | |
133 | ||
b996ad0e RG |
134 | /* |
135 | * Common code for BQ27x00 devices | |
136 | */ | |
137 | ||
a40402ef | 138 | static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg, |
297a533b | 139 | bool single) |
b996ad0e | 140 | { |
297a533b | 141 | return di->bus.read(di, reg, single); |
b996ad0e RG |
142 | } |
143 | ||
144 | /* | |
297a533b | 145 | * Return the battery Relative State-of-Charge |
b996ad0e RG |
146 | * Or < 0 if something fails. |
147 | */ | |
297a533b | 148 | static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di) |
b996ad0e | 149 | { |
297a533b | 150 | int rsoc; |
b996ad0e | 151 | |
e20908d9 | 152 | if (di->chip == BQ27500) |
297a533b | 153 | rsoc = bq27x00_read(di, BQ27500_REG_SOC, false); |
e20908d9 | 154 | else |
297a533b LPC |
155 | rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true); |
156 | ||
157 | if (rsoc < 0) | |
c6cd4f26 | 158 | dev_dbg(di->dev, "error reading relative State-of-Charge\n"); |
297a533b LPC |
159 | |
160 | return rsoc; | |
b996ad0e RG |
161 | } |
162 | ||
631c17ee PR |
163 | /* |
164 | * Return a battery charge value in µAh | |
165 | * Or < 0 if something fails. | |
166 | */ | |
167 | static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg) | |
168 | { | |
169 | int charge; | |
170 | ||
171 | charge = bq27x00_read(di, reg, false); | |
172 | if (charge < 0) { | |
c6cd4f26 PR |
173 | dev_dbg(di->dev, "error reading charge register %02x: %d\n", |
174 | reg, charge); | |
631c17ee PR |
175 | return charge; |
176 | } | |
177 | ||
178 | if (di->chip == BQ27500) | |
179 | charge *= 1000; | |
180 | else | |
181 | charge = charge * 3570 / BQ27000_RS; | |
182 | ||
183 | return charge; | |
184 | } | |
185 | ||
186 | /* | |
187 | * Return the battery Nominal available capaciy in µAh | |
188 | * Or < 0 if something fails. | |
189 | */ | |
190 | static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di) | |
191 | { | |
192 | return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC); | |
193 | } | |
194 | ||
195 | /* | |
196 | * Return the battery Last measured discharge in µAh | |
197 | * Or < 0 if something fails. | |
198 | */ | |
199 | static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di) | |
200 | { | |
201 | return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD); | |
202 | } | |
203 | ||
204 | /* | |
205 | * Return the battery Initial last measured discharge in µAh | |
206 | * Or < 0 if something fails. | |
207 | */ | |
208 | static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di) | |
209 | { | |
210 | int ilmd; | |
211 | ||
212 | if (di->chip == BQ27500) | |
213 | ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false); | |
214 | else | |
215 | ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true); | |
216 | ||
217 | if (ilmd < 0) { | |
c6cd4f26 | 218 | dev_dbg(di->dev, "error reading initial last measured discharge\n"); |
631c17ee PR |
219 | return ilmd; |
220 | } | |
221 | ||
222 | if (di->chip == BQ27500) | |
223 | ilmd *= 1000; | |
224 | else | |
225 | ilmd = ilmd * 256 * 3570 / BQ27000_RS; | |
226 | ||
227 | return ilmd; | |
228 | } | |
229 | ||
a8f6bd23 PR |
230 | /* |
231 | * Return the battery Available energy in µWh | |
232 | * Or < 0 if something fails. | |
233 | */ | |
234 | static int bq27x00_battery_read_energy(struct bq27x00_device_info *di) | |
235 | { | |
236 | int ae; | |
237 | ||
238 | ae = bq27x00_read(di, BQ27x00_REG_AE, false); | |
239 | if (ae < 0) { | |
c6cd4f26 | 240 | dev_dbg(di->dev, "error reading available energy\n"); |
a8f6bd23 PR |
241 | return ae; |
242 | } | |
243 | ||
244 | if (di->chip == BQ27500) | |
245 | ae *= 1000; | |
246 | else | |
247 | ae = ae * 29200 / BQ27000_RS; | |
248 | ||
249 | return ae; | |
250 | } | |
251 | ||
d149e98e PR |
252 | /* |
253 | * Return the battery temperature in tenths of degree Celsius | |
254 | * Or < 0 if something fails. | |
255 | */ | |
256 | static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di) | |
257 | { | |
258 | int temp; | |
259 | ||
260 | temp = bq27x00_read(di, BQ27x00_REG_TEMP, false); | |
261 | if (temp < 0) { | |
262 | dev_err(di->dev, "error reading temperature\n"); | |
263 | return temp; | |
264 | } | |
265 | ||
266 | if (di->chip == BQ27500) | |
267 | temp -= 2731; | |
268 | else | |
269 | temp = ((temp * 5) - 5463) / 2; | |
270 | ||
271 | return temp; | |
272 | } | |
273 | ||
631c17ee PR |
274 | /* |
275 | * Return the battery Cycle count total | |
276 | * Or < 0 if something fails. | |
277 | */ | |
278 | static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di) | |
279 | { | |
280 | int cyct; | |
281 | ||
282 | cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false); | |
283 | if (cyct < 0) | |
284 | dev_err(di->dev, "error reading cycle count total\n"); | |
285 | ||
286 | return cyct; | |
287 | } | |
288 | ||
b996ad0e | 289 | /* |
297a533b LPC |
290 | * Read a time register. |
291 | * Return < 0 if something fails. | |
b996ad0e | 292 | */ |
297a533b | 293 | static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg) |
b996ad0e | 294 | { |
297a533b | 295 | int tval; |
b996ad0e | 296 | |
297a533b LPC |
297 | tval = bq27x00_read(di, reg, false); |
298 | if (tval < 0) { | |
c6cd4f26 PR |
299 | dev_dbg(di->dev, "error reading time register %02x: %d\n", |
300 | reg, tval); | |
297a533b | 301 | return tval; |
b996ad0e RG |
302 | } |
303 | ||
297a533b LPC |
304 | if (tval == 65535) |
305 | return -ENODATA; | |
306 | ||
307 | return tval * 60; | |
308 | } | |
309 | ||
310 | static void bq27x00_update(struct bq27x00_device_info *di) | |
311 | { | |
312 | struct bq27x00_reg_cache cache = {0, }; | |
313 | bool is_bq27500 = di->chip == BQ27500; | |
314 | ||
315 | cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, is_bq27500); | |
316 | if (cache.flags >= 0) { | |
4b226c2c | 317 | if (!is_bq27500 && (cache.flags & BQ27000_FLAG_CI)) { |
c6cd4f26 | 318 | dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n"); |
4b226c2c | 319 | cache.capacity = -ENODATA; |
a8f6bd23 | 320 | cache.energy = -ENODATA; |
4b226c2c PR |
321 | cache.time_to_empty = -ENODATA; |
322 | cache.time_to_empty_avg = -ENODATA; | |
323 | cache.time_to_full = -ENODATA; | |
324 | cache.charge_full = -ENODATA; | |
325 | } else { | |
326 | cache.capacity = bq27x00_battery_read_rsoc(di); | |
a8f6bd23 | 327 | cache.energy = bq27x00_battery_read_energy(di); |
4b226c2c PR |
328 | cache.time_to_empty = bq27x00_battery_read_time(di, BQ27x00_REG_TTE); |
329 | cache.time_to_empty_avg = bq27x00_battery_read_time(di, BQ27x00_REG_TTECP); | |
330 | cache.time_to_full = bq27x00_battery_read_time(di, BQ27x00_REG_TTF); | |
331 | cache.charge_full = bq27x00_battery_read_lmd(di); | |
332 | } | |
d149e98e | 333 | cache.temperature = bq27x00_battery_read_temperature(di); |
73c244a8 | 334 | cache.cycle_count = bq27x00_battery_read_cyct(di); |
297a533b | 335 | |
631c17ee PR |
336 | /* We only have to read charge design full once */ |
337 | if (di->charge_design_full <= 0) | |
338 | di->charge_design_full = bq27x00_battery_read_ilmd(di); | |
297a533b LPC |
339 | } |
340 | ||
b68f6216 | 341 | if (memcmp(&di->cache, &cache, sizeof(cache)) != 0) { |
297a533b LPC |
342 | di->cache = cache; |
343 | power_supply_changed(&di->bat); | |
344 | } | |
345 | ||
346 | di->last_update = jiffies; | |
347 | } | |
348 | ||
740b755a LPC |
349 | static void bq27x00_battery_poll(struct work_struct *work) |
350 | { | |
351 | struct bq27x00_device_info *di = | |
352 | container_of(work, struct bq27x00_device_info, work.work); | |
353 | ||
354 | bq27x00_update(di); | |
355 | ||
356 | if (poll_interval > 0) { | |
357 | /* The timer does not have to be accurate. */ | |
358 | set_timer_slack(&di->work.timer, poll_interval * HZ / 4); | |
359 | schedule_delayed_work(&di->work, poll_interval * HZ); | |
360 | } | |
361 | } | |
362 | ||
b996ad0e | 363 | /* |
bf7d4140 | 364 | * Return the battery average current in µA |
b996ad0e RG |
365 | * Note that current can be negative signed as well |
366 | * Or 0 if something fails. | |
367 | */ | |
297a533b LPC |
368 | static int bq27x00_battery_current(struct bq27x00_device_info *di, |
369 | union power_supply_propval *val) | |
b996ad0e | 370 | { |
297a533b | 371 | int curr; |
b68f6216 | 372 | int flags; |
b996ad0e | 373 | |
b68f6216 | 374 | curr = bq27x00_read(di, BQ27x00_REG_AI, false); |
c6cd4f26 PR |
375 | if (curr < 0) { |
376 | dev_err(di->dev, "error reading current\n"); | |
297a533b | 377 | return curr; |
c6cd4f26 | 378 | } |
e20908d9 GI |
379 | |
380 | if (di->chip == BQ27500) { | |
381 | /* bq27500 returns signed value */ | |
297a533b | 382 | val->intval = (int)((s16)curr) * 1000; |
e20908d9 | 383 | } else { |
b68f6216 PR |
384 | flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false); |
385 | if (flags & BQ27000_FLAG_CHGS) { | |
e20908d9 | 386 | dev_dbg(di->dev, "negative current!\n"); |
afbc74fd | 387 | curr = -curr; |
e20908d9 | 388 | } |
b996ad0e | 389 | |
297a533b | 390 | val->intval = curr * 3570 / BQ27000_RS; |
b996ad0e RG |
391 | } |
392 | ||
297a533b | 393 | return 0; |
b996ad0e RG |
394 | } |
395 | ||
4e924a81 | 396 | static int bq27x00_battery_status(struct bq27x00_device_info *di, |
297a533b | 397 | union power_supply_propval *val) |
4e924a81 | 398 | { |
4e924a81 | 399 | int status; |
4e924a81 GI |
400 | |
401 | if (di->chip == BQ27500) { | |
297a533b | 402 | if (di->cache.flags & BQ27500_FLAG_FC) |
4e924a81 | 403 | status = POWER_SUPPLY_STATUS_FULL; |
270968c0 | 404 | else if (di->cache.flags & BQ27500_FLAG_DSG) |
4e924a81 | 405 | status = POWER_SUPPLY_STATUS_DISCHARGING; |
270968c0 | 406 | else if (di->cache.flags & BQ27500_FLAG_CHG) |
4e924a81 | 407 | status = POWER_SUPPLY_STATUS_CHARGING; |
270968c0 PR |
408 | else if (power_supply_am_i_supplied(&di->bat)) |
409 | status = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
410 | else | |
411 | status = POWER_SUPPLY_STATUS_UNKNOWN; | |
4e924a81 | 412 | } else { |
c1b9ab67 LPC |
413 | if (di->cache.flags & BQ27000_FLAG_FC) |
414 | status = POWER_SUPPLY_STATUS_FULL; | |
415 | else if (di->cache.flags & BQ27000_FLAG_CHGS) | |
4e924a81 | 416 | status = POWER_SUPPLY_STATUS_CHARGING; |
c1b9ab67 LPC |
417 | else if (power_supply_am_i_supplied(&di->bat)) |
418 | status = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
4e924a81 GI |
419 | else |
420 | status = POWER_SUPPLY_STATUS_DISCHARGING; | |
421 | } | |
422 | ||
423 | val->intval = status; | |
297a533b | 424 | |
4e924a81 GI |
425 | return 0; |
426 | } | |
427 | ||
d66bab3f PR |
428 | static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di, |
429 | union power_supply_propval *val) | |
430 | { | |
431 | int level; | |
432 | ||
433 | if (di->chip == BQ27500) { | |
434 | if (di->cache.flags & BQ27500_FLAG_FC) | |
435 | level = POWER_SUPPLY_CAPACITY_LEVEL_FULL; | |
436 | else if (di->cache.flags & BQ27500_FLAG_SOC1) | |
437 | level = POWER_SUPPLY_CAPACITY_LEVEL_LOW; | |
438 | else if (di->cache.flags & BQ27500_FLAG_SOCF) | |
439 | level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; | |
440 | else | |
441 | level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; | |
442 | } else { | |
443 | if (di->cache.flags & BQ27000_FLAG_FC) | |
444 | level = POWER_SUPPLY_CAPACITY_LEVEL_FULL; | |
445 | else if (di->cache.flags & BQ27000_FLAG_EDV1) | |
446 | level = POWER_SUPPLY_CAPACITY_LEVEL_LOW; | |
447 | else if (di->cache.flags & BQ27000_FLAG_EDVF) | |
448 | level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; | |
449 | else | |
450 | level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; | |
451 | } | |
452 | ||
453 | val->intval = level; | |
454 | ||
455 | return 0; | |
456 | } | |
457 | ||
4e924a81 | 458 | /* |
297a533b LPC |
459 | * Return the battery Voltage in milivolts |
460 | * Or < 0 if something fails. | |
4e924a81 | 461 | */ |
297a533b LPC |
462 | static int bq27x00_battery_voltage(struct bq27x00_device_info *di, |
463 | union power_supply_propval *val) | |
4e924a81 | 464 | { |
297a533b | 465 | int volt; |
4e924a81 | 466 | |
297a533b | 467 | volt = bq27x00_read(di, BQ27x00_REG_VOLT, false); |
c6cd4f26 PR |
468 | if (volt < 0) { |
469 | dev_err(di->dev, "error reading voltage\n"); | |
297a533b | 470 | return volt; |
c6cd4f26 | 471 | } |
4e924a81 | 472 | |
297a533b LPC |
473 | val->intval = volt * 1000; |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
478 | static int bq27x00_simple_value(int value, | |
479 | union power_supply_propval *val) | |
480 | { | |
481 | if (value < 0) | |
482 | return value; | |
483 | ||
484 | val->intval = value; | |
4e924a81 | 485 | |
4e924a81 GI |
486 | return 0; |
487 | } | |
488 | ||
b996ad0e RG |
489 | #define to_bq27x00_device_info(x) container_of((x), \ |
490 | struct bq27x00_device_info, bat); | |
491 | ||
492 | static int bq27x00_battery_get_property(struct power_supply *psy, | |
493 | enum power_supply_property psp, | |
494 | union power_supply_propval *val) | |
495 | { | |
4e924a81 | 496 | int ret = 0; |
b996ad0e | 497 | struct bq27x00_device_info *di = to_bq27x00_device_info(psy); |
3413b4ea | 498 | |
740b755a LPC |
499 | mutex_lock(&di->lock); |
500 | if (time_is_before_jiffies(di->last_update + 5 * HZ)) { | |
501 | cancel_delayed_work_sync(&di->work); | |
502 | bq27x00_battery_poll(&di->work.work); | |
503 | } | |
504 | mutex_unlock(&di->lock); | |
297a533b LPC |
505 | |
506 | if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0) | |
3413b4ea | 507 | return -ENODEV; |
b996ad0e RG |
508 | |
509 | switch (psp) { | |
4e924a81 GI |
510 | case POWER_SUPPLY_PROP_STATUS: |
511 | ret = bq27x00_battery_status(di, val); | |
512 | break; | |
b996ad0e | 513 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
297a533b | 514 | ret = bq27x00_battery_voltage(di, val); |
3413b4ea | 515 | break; |
b996ad0e | 516 | case POWER_SUPPLY_PROP_PRESENT: |
297a533b | 517 | val->intval = di->cache.flags < 0 ? 0 : 1; |
b996ad0e RG |
518 | break; |
519 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
297a533b | 520 | ret = bq27x00_battery_current(di, val); |
b996ad0e RG |
521 | break; |
522 | case POWER_SUPPLY_PROP_CAPACITY: | |
297a533b | 523 | ret = bq27x00_simple_value(di->cache.capacity, val); |
b996ad0e | 524 | break; |
d66bab3f PR |
525 | case POWER_SUPPLY_PROP_CAPACITY_LEVEL: |
526 | ret = bq27x00_battery_capacity_level(di, val); | |
527 | break; | |
b996ad0e | 528 | case POWER_SUPPLY_PROP_TEMP: |
d149e98e | 529 | ret = bq27x00_simple_value(di->cache.temperature, val); |
b996ad0e | 530 | break; |
4e924a81 | 531 | case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW: |
297a533b | 532 | ret = bq27x00_simple_value(di->cache.time_to_empty, val); |
4e924a81 GI |
533 | break; |
534 | case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG: | |
297a533b | 535 | ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val); |
4e924a81 GI |
536 | break; |
537 | case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW: | |
297a533b | 538 | ret = bq27x00_simple_value(di->cache.time_to_full, val); |
4e924a81 | 539 | break; |
5661f334 LPC |
540 | case POWER_SUPPLY_PROP_TECHNOLOGY: |
541 | val->intval = POWER_SUPPLY_TECHNOLOGY_LION; | |
542 | break; | |
631c17ee PR |
543 | case POWER_SUPPLY_PROP_CHARGE_NOW: |
544 | ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val); | |
545 | break; | |
546 | case POWER_SUPPLY_PROP_CHARGE_FULL: | |
547 | ret = bq27x00_simple_value(di->cache.charge_full, val); | |
548 | break; | |
549 | case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: | |
550 | ret = bq27x00_simple_value(di->charge_design_full, val); | |
551 | break; | |
73c244a8 PR |
552 | case POWER_SUPPLY_PROP_CYCLE_COUNT: |
553 | ret = bq27x00_simple_value(di->cache.cycle_count, val); | |
631c17ee PR |
554 | break; |
555 | case POWER_SUPPLY_PROP_ENERGY_NOW: | |
a8f6bd23 | 556 | ret = bq27x00_simple_value(di->cache.energy, val); |
631c17ee | 557 | break; |
b996ad0e RG |
558 | default: |
559 | return -EINVAL; | |
560 | } | |
561 | ||
4e924a81 | 562 | return ret; |
b996ad0e RG |
563 | } |
564 | ||
740b755a LPC |
565 | static void bq27x00_external_power_changed(struct power_supply *psy) |
566 | { | |
567 | struct bq27x00_device_info *di = to_bq27x00_device_info(psy); | |
568 | ||
569 | cancel_delayed_work_sync(&di->work); | |
570 | schedule_delayed_work(&di->work, 0); | |
571 | } | |
572 | ||
a40402ef | 573 | static int bq27x00_powersupply_init(struct bq27x00_device_info *di) |
b996ad0e | 574 | { |
a40402ef LPC |
575 | int ret; |
576 | ||
b996ad0e RG |
577 | di->bat.type = POWER_SUPPLY_TYPE_BATTERY; |
578 | di->bat.properties = bq27x00_battery_props; | |
579 | di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props); | |
580 | di->bat.get_property = bq27x00_battery_get_property; | |
740b755a LPC |
581 | di->bat.external_power_changed = bq27x00_external_power_changed; |
582 | ||
583 | INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll); | |
584 | mutex_init(&di->lock); | |
a40402ef LPC |
585 | |
586 | ret = power_supply_register(di->dev, &di->bat); | |
587 | if (ret) { | |
588 | dev_err(di->dev, "failed to register battery: %d\n", ret); | |
589 | return ret; | |
590 | } | |
591 | ||
592 | dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION); | |
593 | ||
297a533b LPC |
594 | bq27x00_update(di); |
595 | ||
a40402ef | 596 | return 0; |
b996ad0e RG |
597 | } |
598 | ||
740b755a LPC |
599 | static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di) |
600 | { | |
601 | cancel_delayed_work_sync(&di->work); | |
602 | ||
603 | power_supply_unregister(&di->bat); | |
604 | ||
605 | mutex_destroy(&di->lock); | |
606 | } | |
607 | ||
7fb7ba58 LPC |
608 | |
609 | /* i2c specific code */ | |
610 | #ifdef CONFIG_BATTERY_BQ27X00_I2C | |
611 | ||
612 | /* If the system has several batteries we need a different name for each | |
613 | * of them... | |
b996ad0e | 614 | */ |
7fb7ba58 LPC |
615 | static DEFINE_IDR(battery_id); |
616 | static DEFINE_MUTEX(battery_mutex); | |
b996ad0e | 617 | |
297a533b | 618 | static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single) |
b996ad0e | 619 | { |
a40402ef | 620 | struct i2c_client *client = to_i2c_client(di->dev); |
9e912f45 | 621 | struct i2c_msg msg[2]; |
b996ad0e | 622 | unsigned char data[2]; |
297a533b | 623 | int ret; |
b996ad0e RG |
624 | |
625 | if (!client->adapter) | |
626 | return -ENODEV; | |
627 | ||
9e912f45 GI |
628 | msg[0].addr = client->addr; |
629 | msg[0].flags = 0; | |
630 | msg[0].buf = ® | |
631 | msg[0].len = sizeof(reg); | |
632 | msg[1].addr = client->addr; | |
633 | msg[1].flags = I2C_M_RD; | |
634 | msg[1].buf = data; | |
2ec523a8 | 635 | if (single) |
9e912f45 | 636 | msg[1].len = 1; |
2ec523a8 | 637 | else |
9e912f45 | 638 | msg[1].len = 2; |
2ec523a8 | 639 | |
9e912f45 | 640 | ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg)); |
2ec523a8 LPC |
641 | if (ret < 0) |
642 | return ret; | |
643 | ||
644 | if (!single) | |
645 | ret = get_unaligned_le16(data); | |
646 | else | |
647 | ret = data[0]; | |
b996ad0e | 648 | |
297a533b | 649 | return ret; |
b996ad0e RG |
650 | } |
651 | ||
e20908d9 | 652 | static int bq27x00_battery_probe(struct i2c_client *client, |
b996ad0e RG |
653 | const struct i2c_device_id *id) |
654 | { | |
655 | char *name; | |
656 | struct bq27x00_device_info *di; | |
b996ad0e RG |
657 | int num; |
658 | int retval = 0; | |
659 | ||
660 | /* Get new ID for the new battery device */ | |
661 | retval = idr_pre_get(&battery_id, GFP_KERNEL); | |
662 | if (retval == 0) | |
663 | return -ENOMEM; | |
664 | mutex_lock(&battery_mutex); | |
665 | retval = idr_get_new(&battery_id, client, &num); | |
666 | mutex_unlock(&battery_mutex); | |
667 | if (retval < 0) | |
668 | return retval; | |
669 | ||
e20908d9 | 670 | name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num); |
b996ad0e RG |
671 | if (!name) { |
672 | dev_err(&client->dev, "failed to allocate device name\n"); | |
673 | retval = -ENOMEM; | |
674 | goto batt_failed_1; | |
675 | } | |
676 | ||
677 | di = kzalloc(sizeof(*di), GFP_KERNEL); | |
678 | if (!di) { | |
679 | dev_err(&client->dev, "failed to allocate device info data\n"); | |
680 | retval = -ENOMEM; | |
681 | goto batt_failed_2; | |
682 | } | |
a40402ef | 683 | |
b996ad0e | 684 | di->id = num; |
a40402ef | 685 | di->dev = &client->dev; |
e20908d9 | 686 | di->chip = id->driver_data; |
a40402ef LPC |
687 | di->bat.name = name; |
688 | di->bus.read = &bq27x00_read_i2c; | |
b996ad0e | 689 | |
a40402ef | 690 | if (bq27x00_powersupply_init(di)) |
b996ad0e | 691 | goto batt_failed_3; |
b996ad0e RG |
692 | |
693 | i2c_set_clientdata(client, di); | |
b996ad0e RG |
694 | |
695 | return 0; | |
696 | ||
b996ad0e RG |
697 | batt_failed_3: |
698 | kfree(di); | |
699 | batt_failed_2: | |
700 | kfree(name); | |
701 | batt_failed_1: | |
702 | mutex_lock(&battery_mutex); | |
703 | idr_remove(&battery_id, num); | |
704 | mutex_unlock(&battery_mutex); | |
705 | ||
706 | return retval; | |
707 | } | |
708 | ||
e20908d9 | 709 | static int bq27x00_battery_remove(struct i2c_client *client) |
b996ad0e RG |
710 | { |
711 | struct bq27x00_device_info *di = i2c_get_clientdata(client); | |
712 | ||
740b755a | 713 | bq27x00_powersupply_unregister(di); |
b996ad0e RG |
714 | |
715 | kfree(di->bat.name); | |
716 | ||
717 | mutex_lock(&battery_mutex); | |
718 | idr_remove(&battery_id, di->id); | |
719 | mutex_unlock(&battery_mutex); | |
720 | ||
721 | kfree(di); | |
722 | ||
723 | return 0; | |
724 | } | |
725 | ||
e20908d9 GI |
726 | static const struct i2c_device_id bq27x00_id[] = { |
727 | { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */ | |
728 | { "bq27500", BQ27500 }, | |
b996ad0e RG |
729 | {}, |
730 | }; | |
fd9b958c | 731 | MODULE_DEVICE_TABLE(i2c, bq27x00_id); |
b996ad0e | 732 | |
e20908d9 | 733 | static struct i2c_driver bq27x00_battery_driver = { |
b996ad0e | 734 | .driver = { |
e20908d9 | 735 | .name = "bq27x00-battery", |
b996ad0e | 736 | }, |
e20908d9 GI |
737 | .probe = bq27x00_battery_probe, |
738 | .remove = bq27x00_battery_remove, | |
739 | .id_table = bq27x00_id, | |
b996ad0e RG |
740 | }; |
741 | ||
7fb7ba58 LPC |
742 | static inline int bq27x00_battery_i2c_init(void) |
743 | { | |
744 | int ret = i2c_add_driver(&bq27x00_battery_driver); | |
745 | if (ret) | |
746 | printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n"); | |
747 | ||
748 | return ret; | |
749 | } | |
750 | ||
751 | static inline void bq27x00_battery_i2c_exit(void) | |
752 | { | |
753 | i2c_del_driver(&bq27x00_battery_driver); | |
754 | } | |
755 | ||
756 | #else | |
757 | ||
758 | static inline int bq27x00_battery_i2c_init(void) { return 0; } | |
759 | static inline void bq27x00_battery_i2c_exit(void) {}; | |
760 | ||
761 | #endif | |
762 | ||
763 | /* platform specific code */ | |
764 | #ifdef CONFIG_BATTERY_BQ27X00_PLATFORM | |
765 | ||
766 | static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg, | |
297a533b | 767 | bool single) |
7fb7ba58 LPC |
768 | { |
769 | struct device *dev = di->dev; | |
770 | struct bq27000_platform_data *pdata = dev->platform_data; | |
771 | unsigned int timeout = 3; | |
772 | int upper, lower; | |
773 | int temp; | |
774 | ||
775 | if (!single) { | |
776 | /* Make sure the value has not changed in between reading the | |
777 | * lower and the upper part */ | |
778 | upper = pdata->read(dev, reg + 1); | |
779 | do { | |
780 | temp = upper; | |
781 | if (upper < 0) | |
782 | return upper; | |
783 | ||
784 | lower = pdata->read(dev, reg); | |
785 | if (lower < 0) | |
786 | return lower; | |
787 | ||
788 | upper = pdata->read(dev, reg + 1); | |
789 | } while (temp != upper && --timeout); | |
790 | ||
791 | if (timeout == 0) | |
792 | return -EIO; | |
793 | ||
297a533b | 794 | return (upper << 8) | lower; |
7fb7ba58 | 795 | } |
297a533b LPC |
796 | |
797 | return pdata->read(dev, reg); | |
7fb7ba58 LPC |
798 | } |
799 | ||
800 | static int __devinit bq27000_battery_probe(struct platform_device *pdev) | |
801 | { | |
802 | struct bq27x00_device_info *di; | |
803 | struct bq27000_platform_data *pdata = pdev->dev.platform_data; | |
804 | int ret; | |
805 | ||
806 | if (!pdata) { | |
807 | dev_err(&pdev->dev, "no platform_data supplied\n"); | |
808 | return -EINVAL; | |
809 | } | |
810 | ||
811 | if (!pdata->read) { | |
812 | dev_err(&pdev->dev, "no hdq read callback supplied\n"); | |
813 | return -EINVAL; | |
814 | } | |
815 | ||
816 | di = kzalloc(sizeof(*di), GFP_KERNEL); | |
817 | if (!di) { | |
818 | dev_err(&pdev->dev, "failed to allocate device info data\n"); | |
819 | return -ENOMEM; | |
820 | } | |
821 | ||
822 | platform_set_drvdata(pdev, di); | |
823 | ||
824 | di->dev = &pdev->dev; | |
825 | di->chip = BQ27000; | |
826 | ||
827 | di->bat.name = pdata->name ?: dev_name(&pdev->dev); | |
828 | di->bus.read = &bq27000_read_platform; | |
829 | ||
830 | ret = bq27x00_powersupply_init(di); | |
831 | if (ret) | |
832 | goto err_free; | |
833 | ||
834 | return 0; | |
835 | ||
836 | err_free: | |
837 | platform_set_drvdata(pdev, NULL); | |
838 | kfree(di); | |
839 | ||
840 | return ret; | |
841 | } | |
842 | ||
843 | static int __devexit bq27000_battery_remove(struct platform_device *pdev) | |
844 | { | |
845 | struct bq27x00_device_info *di = platform_get_drvdata(pdev); | |
846 | ||
740b755a LPC |
847 | bq27x00_powersupply_unregister(di); |
848 | ||
7fb7ba58 LPC |
849 | platform_set_drvdata(pdev, NULL); |
850 | kfree(di); | |
851 | ||
852 | return 0; | |
853 | } | |
854 | ||
855 | static struct platform_driver bq27000_battery_driver = { | |
856 | .probe = bq27000_battery_probe, | |
857 | .remove = __devexit_p(bq27000_battery_remove), | |
858 | .driver = { | |
859 | .name = "bq27000-battery", | |
860 | .owner = THIS_MODULE, | |
861 | }, | |
862 | }; | |
863 | ||
864 | static inline int bq27x00_battery_platform_init(void) | |
865 | { | |
866 | int ret = platform_driver_register(&bq27000_battery_driver); | |
867 | if (ret) | |
868 | printk(KERN_ERR "Unable to register BQ27000 platform driver\n"); | |
869 | ||
870 | return ret; | |
871 | } | |
872 | ||
873 | static inline void bq27x00_battery_platform_exit(void) | |
874 | { | |
875 | platform_driver_unregister(&bq27000_battery_driver); | |
876 | } | |
877 | ||
878 | #else | |
879 | ||
880 | static inline int bq27x00_battery_platform_init(void) { return 0; } | |
881 | static inline void bq27x00_battery_platform_exit(void) {}; | |
882 | ||
883 | #endif | |
884 | ||
885 | /* | |
886 | * Module stuff | |
887 | */ | |
888 | ||
b996ad0e RG |
889 | static int __init bq27x00_battery_init(void) |
890 | { | |
891 | int ret; | |
892 | ||
7fb7ba58 LPC |
893 | ret = bq27x00_battery_i2c_init(); |
894 | if (ret) | |
895 | return ret; | |
896 | ||
897 | ret = bq27x00_battery_platform_init(); | |
b996ad0e | 898 | if (ret) |
7fb7ba58 | 899 | bq27x00_battery_i2c_exit(); |
b996ad0e RG |
900 | |
901 | return ret; | |
902 | } | |
903 | module_init(bq27x00_battery_init); | |
904 | ||
905 | static void __exit bq27x00_battery_exit(void) | |
906 | { | |
7fb7ba58 LPC |
907 | bq27x00_battery_platform_exit(); |
908 | bq27x00_battery_i2c_exit(); | |
b996ad0e RG |
909 | } |
910 | module_exit(bq27x00_battery_exit); | |
911 | ||
912 | MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>"); | |
913 | MODULE_DESCRIPTION("BQ27x00 battery monitor driver"); | |
914 | MODULE_LICENSE("GPL"); |