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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 | |
a66f59ba | 25 | * http://www.ti.com/product/bq27425-g1 |
631c17ee PR |
26 | */ |
27 | ||
1cb82fdb | 28 | #include <linux/device.h> |
b996ad0e RG |
29 | #include <linux/module.h> |
30 | #include <linux/param.h> | |
31 | #include <linux/jiffies.h> | |
32 | #include <linux/workqueue.h> | |
33 | #include <linux/delay.h> | |
34 | #include <linux/platform_device.h> | |
35 | #include <linux/power_supply.h> | |
36 | #include <linux/idr.h> | |
b996ad0e | 37 | #include <linux/i2c.h> |
5a0e3ad6 | 38 | #include <linux/slab.h> |
8aef7e8f | 39 | #include <asm/unaligned.h> |
b996ad0e | 40 | |
7fb7ba58 LPC |
41 | #include <linux/power/bq27x00_battery.h> |
42 | ||
631c17ee | 43 | #define DRIVER_VERSION "1.2.0" |
b996ad0e RG |
44 | |
45 | #define BQ27x00_REG_TEMP 0x06 | |
46 | #define BQ27x00_REG_VOLT 0x08 | |
b996ad0e RG |
47 | #define BQ27x00_REG_AI 0x14 |
48 | #define BQ27x00_REG_FLAGS 0x0A | |
4e924a81 GI |
49 | #define BQ27x00_REG_TTE 0x16 |
50 | #define BQ27x00_REG_TTF 0x18 | |
51 | #define BQ27x00_REG_TTECP 0x26 | |
202e0116 | 52 | #define BQ27x00_REG_NAC 0x0C /* Nominal available capacity */ |
631c17ee PR |
53 | #define BQ27x00_REG_LMD 0x12 /* Last measured discharge */ |
54 | #define BQ27x00_REG_CYCT 0x2A /* Cycle count total */ | |
202e0116 | 55 | #define BQ27x00_REG_AE 0x22 /* Available energy */ |
9903e627 | 56 | #define BQ27x00_POWER_AVG 0x24 |
b996ad0e | 57 | |
e20908d9 | 58 | #define BQ27000_REG_RSOC 0x0B /* Relative State-of-Charge */ |
631c17ee | 59 | #define BQ27000_REG_ILMD 0x76 /* Initial last measured discharge */ |
d66bab3f PR |
60 | #define BQ27000_FLAG_EDVF BIT(0) /* Final End-of-Discharge-Voltage flag */ |
61 | #define BQ27000_FLAG_EDV1 BIT(1) /* First End-of-Discharge-Voltage flag */ | |
4b226c2c | 62 | #define BQ27000_FLAG_CI BIT(4) /* Capacity Inaccurate flag */ |
c1b9ab67 | 63 | #define BQ27000_FLAG_FC BIT(5) |
d66bab3f | 64 | #define BQ27000_FLAG_CHGS BIT(7) /* Charge state flag */ |
e20908d9 | 65 | |
bf7d4140 | 66 | #define BQ27500_REG_SOC 0x2C |
631c17ee | 67 | #define BQ27500_REG_DCAP 0x3C /* Design capacity */ |
b7aaacf5 | 68 | #define BQ27500_FLAG_DSC BIT(0) |
d66bab3f PR |
69 | #define BQ27500_FLAG_SOCF BIT(1) /* State-of-Charge threshold final */ |
70 | #define BQ27500_FLAG_SOC1 BIT(2) /* State-of-Charge threshold 1 */ | |
b7aaacf5 | 71 | #define BQ27500_FLAG_FC BIT(9) |
9903e627 | 72 | #define BQ27500_FLAG_OTC BIT(15) |
e20908d9 | 73 | |
a66f59ba SG |
74 | /* bq27425 register addresses are same as bq27x00 addresses minus 4 */ |
75 | #define BQ27425_REG_OFFSET 0x04 | |
76 | #define BQ27425_REG_SOC 0x18 /* Register address plus offset */ | |
77 | ||
a2e5118c | 78 | #define BQ27000_RS 20 /* Resistor sense */ |
9903e627 | 79 | #define BQ27x00_POWER_CONSTANT (256 * 29200 / 1000) |
a2e5118c | 80 | |
b996ad0e RG |
81 | struct bq27x00_device_info; |
82 | struct bq27x00_access_methods { | |
297a533b | 83 | int (*read)(struct bq27x00_device_info *di, u8 reg, bool single); |
b996ad0e RG |
84 | }; |
85 | ||
a66f59ba | 86 | enum bq27x00_chip { BQ27000, BQ27500, BQ27425}; |
e20908d9 | 87 | |
297a533b LPC |
88 | struct bq27x00_reg_cache { |
89 | int temperature; | |
90 | int time_to_empty; | |
91 | int time_to_empty_avg; | |
92 | int time_to_full; | |
631c17ee | 93 | int charge_full; |
73c244a8 | 94 | int cycle_count; |
297a533b | 95 | int capacity; |
a8f6bd23 | 96 | int energy; |
297a533b | 97 | int flags; |
9903e627 SR |
98 | int power_avg; |
99 | int health; | |
297a533b LPC |
100 | }; |
101 | ||
b996ad0e RG |
102 | struct bq27x00_device_info { |
103 | struct device *dev; | |
104 | int id; | |
e20908d9 | 105 | enum bq27x00_chip chip; |
b996ad0e | 106 | |
297a533b | 107 | struct bq27x00_reg_cache cache; |
631c17ee PR |
108 | int charge_design_full; |
109 | ||
297a533b | 110 | unsigned long last_update; |
740b755a | 111 | struct delayed_work work; |
297a533b | 112 | |
a40402ef LPC |
113 | struct power_supply bat; |
114 | ||
115 | struct bq27x00_access_methods bus; | |
740b755a LPC |
116 | |
117 | struct mutex lock; | |
b996ad0e RG |
118 | }; |
119 | ||
120 | static enum power_supply_property bq27x00_battery_props[] = { | |
4e924a81 | 121 | POWER_SUPPLY_PROP_STATUS, |
b996ad0e RG |
122 | POWER_SUPPLY_PROP_PRESENT, |
123 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
124 | POWER_SUPPLY_PROP_CURRENT_NOW, | |
125 | POWER_SUPPLY_PROP_CAPACITY, | |
d66bab3f | 126 | POWER_SUPPLY_PROP_CAPACITY_LEVEL, |
b996ad0e | 127 | POWER_SUPPLY_PROP_TEMP, |
4e924a81 GI |
128 | POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW, |
129 | POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, | |
130 | POWER_SUPPLY_PROP_TIME_TO_FULL_NOW, | |
5661f334 | 131 | POWER_SUPPLY_PROP_TECHNOLOGY, |
631c17ee PR |
132 | POWER_SUPPLY_PROP_CHARGE_FULL, |
133 | POWER_SUPPLY_PROP_CHARGE_NOW, | |
134 | POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, | |
73c244a8 | 135 | POWER_SUPPLY_PROP_CYCLE_COUNT, |
631c17ee | 136 | POWER_SUPPLY_PROP_ENERGY_NOW, |
9903e627 SR |
137 | POWER_SUPPLY_PROP_POWER_AVG, |
138 | POWER_SUPPLY_PROP_HEALTH, | |
b996ad0e RG |
139 | }; |
140 | ||
a66f59ba SG |
141 | static enum power_supply_property bq27425_battery_props[] = { |
142 | POWER_SUPPLY_PROP_STATUS, | |
143 | POWER_SUPPLY_PROP_PRESENT, | |
144 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
145 | POWER_SUPPLY_PROP_CURRENT_NOW, | |
146 | POWER_SUPPLY_PROP_CAPACITY, | |
147 | POWER_SUPPLY_PROP_CAPACITY_LEVEL, | |
148 | POWER_SUPPLY_PROP_TEMP, | |
149 | POWER_SUPPLY_PROP_TECHNOLOGY, | |
150 | POWER_SUPPLY_PROP_CHARGE_FULL, | |
151 | POWER_SUPPLY_PROP_CHARGE_NOW, | |
152 | POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, | |
153 | }; | |
154 | ||
740b755a LPC |
155 | static unsigned int poll_interval = 360; |
156 | module_param(poll_interval, uint, 0644); | |
157 | MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \ | |
158 | "0 disables polling"); | |
159 | ||
b996ad0e RG |
160 | /* |
161 | * Common code for BQ27x00 devices | |
162 | */ | |
163 | ||
a40402ef | 164 | static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg, |
297a533b | 165 | bool single) |
b996ad0e | 166 | { |
a66f59ba SG |
167 | if (di->chip == BQ27425) |
168 | return di->bus.read(di, reg - BQ27425_REG_OFFSET, single); | |
297a533b | 169 | return di->bus.read(di, reg, single); |
b996ad0e RG |
170 | } |
171 | ||
a66f59ba SG |
172 | /* |
173 | * Higher versions of the chip like BQ27425 and BQ27500 | |
174 | * differ from BQ27000 and BQ27200 in calculation of certain | |
175 | * parameters. Hence we need to check for the chip type. | |
176 | */ | |
177 | static bool bq27xxx_is_chip_version_higher(struct bq27x00_device_info *di) | |
178 | { | |
179 | if (di->chip == BQ27425 || di->chip == BQ27500) | |
180 | return true; | |
181 | return false; | |
182 | } | |
183 | ||
b996ad0e | 184 | /* |
297a533b | 185 | * Return the battery Relative State-of-Charge |
b996ad0e RG |
186 | * Or < 0 if something fails. |
187 | */ | |
297a533b | 188 | static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di) |
b996ad0e | 189 | { |
297a533b | 190 | int rsoc; |
b996ad0e | 191 | |
e20908d9 | 192 | if (di->chip == BQ27500) |
297a533b | 193 | rsoc = bq27x00_read(di, BQ27500_REG_SOC, false); |
a66f59ba SG |
194 | else if (di->chip == BQ27425) |
195 | rsoc = bq27x00_read(di, BQ27425_REG_SOC, false); | |
e20908d9 | 196 | else |
297a533b LPC |
197 | rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true); |
198 | ||
199 | if (rsoc < 0) | |
c6cd4f26 | 200 | dev_dbg(di->dev, "error reading relative State-of-Charge\n"); |
297a533b LPC |
201 | |
202 | return rsoc; | |
b996ad0e RG |
203 | } |
204 | ||
631c17ee PR |
205 | /* |
206 | * Return a battery charge value in µAh | |
207 | * Or < 0 if something fails. | |
208 | */ | |
209 | static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg) | |
210 | { | |
211 | int charge; | |
212 | ||
213 | charge = bq27x00_read(di, reg, false); | |
214 | if (charge < 0) { | |
c6cd4f26 PR |
215 | dev_dbg(di->dev, "error reading charge register %02x: %d\n", |
216 | reg, charge); | |
631c17ee PR |
217 | return charge; |
218 | } | |
219 | ||
a66f59ba | 220 | if (bq27xxx_is_chip_version_higher(di)) |
631c17ee PR |
221 | charge *= 1000; |
222 | else | |
223 | charge = charge * 3570 / BQ27000_RS; | |
224 | ||
225 | return charge; | |
226 | } | |
227 | ||
228 | /* | |
229 | * Return the battery Nominal available capaciy in µAh | |
230 | * Or < 0 if something fails. | |
231 | */ | |
232 | static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di) | |
233 | { | |
e59ec4a1 PR |
234 | int flags; |
235 | bool is_bq27500 = di->chip == BQ27500; | |
236 | bool is_higher = bq27xxx_is_chip_version_higher(di); | |
237 | ||
238 | flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500); | |
239 | if (flags >= 0 && !is_higher && (flags & BQ27000_FLAG_CI)) | |
240 | return -ENODATA; | |
241 | ||
631c17ee PR |
242 | return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC); |
243 | } | |
244 | ||
245 | /* | |
246 | * Return the battery Last measured discharge in µAh | |
247 | * Or < 0 if something fails. | |
248 | */ | |
249 | static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di) | |
250 | { | |
251 | return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD); | |
252 | } | |
253 | ||
254 | /* | |
255 | * Return the battery Initial last measured discharge in µAh | |
256 | * Or < 0 if something fails. | |
257 | */ | |
258 | static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di) | |
259 | { | |
260 | int ilmd; | |
261 | ||
a66f59ba | 262 | if (bq27xxx_is_chip_version_higher(di)) |
631c17ee PR |
263 | ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false); |
264 | else | |
265 | ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true); | |
266 | ||
267 | if (ilmd < 0) { | |
c6cd4f26 | 268 | dev_dbg(di->dev, "error reading initial last measured discharge\n"); |
631c17ee PR |
269 | return ilmd; |
270 | } | |
271 | ||
a66f59ba | 272 | if (bq27xxx_is_chip_version_higher(di)) |
631c17ee PR |
273 | ilmd *= 1000; |
274 | else | |
275 | ilmd = ilmd * 256 * 3570 / BQ27000_RS; | |
276 | ||
277 | return ilmd; | |
278 | } | |
279 | ||
a8f6bd23 PR |
280 | /* |
281 | * Return the battery Available energy in µWh | |
282 | * Or < 0 if something fails. | |
283 | */ | |
284 | static int bq27x00_battery_read_energy(struct bq27x00_device_info *di) | |
285 | { | |
286 | int ae; | |
287 | ||
288 | ae = bq27x00_read(di, BQ27x00_REG_AE, false); | |
289 | if (ae < 0) { | |
c6cd4f26 | 290 | dev_dbg(di->dev, "error reading available energy\n"); |
a8f6bd23 PR |
291 | return ae; |
292 | } | |
293 | ||
294 | if (di->chip == BQ27500) | |
295 | ae *= 1000; | |
296 | else | |
297 | ae = ae * 29200 / BQ27000_RS; | |
298 | ||
299 | return ae; | |
300 | } | |
301 | ||
d149e98e | 302 | /* |
5dc3443e | 303 | * Return the battery temperature in tenths of degree Kelvin |
d149e98e PR |
304 | * Or < 0 if something fails. |
305 | */ | |
306 | static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di) | |
307 | { | |
308 | int temp; | |
309 | ||
310 | temp = bq27x00_read(di, BQ27x00_REG_TEMP, false); | |
311 | if (temp < 0) { | |
312 | dev_err(di->dev, "error reading temperature\n"); | |
313 | return temp; | |
314 | } | |
315 | ||
5dc3443e PR |
316 | if (!bq27xxx_is_chip_version_higher(di)) |
317 | temp = 5 * temp / 2; | |
d149e98e PR |
318 | |
319 | return temp; | |
320 | } | |
321 | ||
631c17ee PR |
322 | /* |
323 | * Return the battery Cycle count total | |
324 | * Or < 0 if something fails. | |
325 | */ | |
326 | static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di) | |
327 | { | |
328 | int cyct; | |
329 | ||
330 | cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false); | |
331 | if (cyct < 0) | |
332 | dev_err(di->dev, "error reading cycle count total\n"); | |
333 | ||
334 | return cyct; | |
335 | } | |
336 | ||
b996ad0e | 337 | /* |
297a533b LPC |
338 | * Read a time register. |
339 | * Return < 0 if something fails. | |
b996ad0e | 340 | */ |
297a533b | 341 | static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg) |
b996ad0e | 342 | { |
297a533b | 343 | int tval; |
b996ad0e | 344 | |
297a533b LPC |
345 | tval = bq27x00_read(di, reg, false); |
346 | if (tval < 0) { | |
c6cd4f26 PR |
347 | dev_dbg(di->dev, "error reading time register %02x: %d\n", |
348 | reg, tval); | |
297a533b | 349 | return tval; |
b996ad0e RG |
350 | } |
351 | ||
297a533b LPC |
352 | if (tval == 65535) |
353 | return -ENODATA; | |
354 | ||
355 | return tval * 60; | |
356 | } | |
357 | ||
9903e627 SR |
358 | /* |
359 | * Read a power avg register. | |
360 | * Return < 0 if something fails. | |
361 | */ | |
362 | static int bq27x00_battery_read_pwr_avg(struct bq27x00_device_info *di, u8 reg) | |
363 | { | |
364 | int tval; | |
365 | ||
366 | tval = bq27x00_read(di, reg, false); | |
367 | if (tval < 0) { | |
368 | dev_err(di->dev, "error reading power avg rgister %02x: %d\n", | |
369 | reg, tval); | |
370 | return tval; | |
371 | } | |
372 | ||
373 | if (di->chip == BQ27500) | |
374 | return tval; | |
375 | else | |
376 | return (tval * BQ27x00_POWER_CONSTANT) / BQ27000_RS; | |
377 | } | |
378 | ||
379 | /* | |
380 | * Read flag register. | |
381 | * Return < 0 if something fails. | |
382 | */ | |
383 | static int bq27x00_battery_read_health(struct bq27x00_device_info *di) | |
384 | { | |
385 | int tval; | |
386 | ||
387 | tval = bq27x00_read(di, BQ27x00_REG_FLAGS, false); | |
388 | if (tval < 0) { | |
389 | dev_err(di->dev, "error reading flag register:%d\n", tval); | |
390 | return tval; | |
391 | } | |
392 | ||
393 | if ((di->chip == BQ27500)) { | |
394 | if (tval & BQ27500_FLAG_SOCF) | |
395 | tval = POWER_SUPPLY_HEALTH_DEAD; | |
396 | else if (tval & BQ27500_FLAG_OTC) | |
397 | tval = POWER_SUPPLY_HEALTH_OVERHEAT; | |
398 | else | |
399 | tval = POWER_SUPPLY_HEALTH_GOOD; | |
400 | return tval; | |
401 | } else { | |
402 | if (tval & BQ27000_FLAG_EDV1) | |
403 | tval = POWER_SUPPLY_HEALTH_DEAD; | |
404 | else | |
405 | tval = POWER_SUPPLY_HEALTH_GOOD; | |
406 | return tval; | |
407 | } | |
408 | ||
409 | return -1; | |
410 | } | |
411 | ||
297a533b LPC |
412 | static void bq27x00_update(struct bq27x00_device_info *di) |
413 | { | |
414 | struct bq27x00_reg_cache cache = {0, }; | |
415 | bool is_bq27500 = di->chip == BQ27500; | |
a66f59ba | 416 | bool is_bq27425 = di->chip == BQ27425; |
297a533b | 417 | |
4d403659 | 418 | cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500); |
3dd843e1 MB |
419 | if ((cache.flags & 0xff) == 0xff) |
420 | /* read error */ | |
421 | cache.flags = -1; | |
297a533b | 422 | if (cache.flags >= 0) { |
a66f59ba SG |
423 | if (!is_bq27500 && !is_bq27425 |
424 | && (cache.flags & BQ27000_FLAG_CI)) { | |
c6cd4f26 | 425 | dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n"); |
4b226c2c | 426 | cache.capacity = -ENODATA; |
a8f6bd23 | 427 | cache.energy = -ENODATA; |
4b226c2c PR |
428 | cache.time_to_empty = -ENODATA; |
429 | cache.time_to_empty_avg = -ENODATA; | |
430 | cache.time_to_full = -ENODATA; | |
431 | cache.charge_full = -ENODATA; | |
9903e627 | 432 | cache.health = -ENODATA; |
4b226c2c PR |
433 | } else { |
434 | cache.capacity = bq27x00_battery_read_rsoc(di); | |
a66f59ba SG |
435 | if (!is_bq27425) { |
436 | cache.energy = bq27x00_battery_read_energy(di); | |
437 | cache.time_to_empty = | |
438 | bq27x00_battery_read_time(di, | |
439 | BQ27x00_REG_TTE); | |
440 | cache.time_to_empty_avg = | |
441 | bq27x00_battery_read_time(di, | |
442 | BQ27x00_REG_TTECP); | |
443 | cache.time_to_full = | |
444 | bq27x00_battery_read_time(di, | |
445 | BQ27x00_REG_TTF); | |
446 | } | |
4b226c2c | 447 | cache.charge_full = bq27x00_battery_read_lmd(di); |
9903e627 | 448 | cache.health = bq27x00_battery_read_health(di); |
4b226c2c | 449 | } |
d149e98e | 450 | cache.temperature = bq27x00_battery_read_temperature(di); |
a66f59ba SG |
451 | if (!is_bq27425) |
452 | cache.cycle_count = bq27x00_battery_read_cyct(di); | |
9903e627 SR |
453 | cache.power_avg = |
454 | bq27x00_battery_read_pwr_avg(di, BQ27x00_POWER_AVG); | |
297a533b | 455 | |
631c17ee PR |
456 | /* We only have to read charge design full once */ |
457 | if (di->charge_design_full <= 0) | |
458 | di->charge_design_full = bq27x00_battery_read_ilmd(di); | |
297a533b LPC |
459 | } |
460 | ||
b68f6216 | 461 | if (memcmp(&di->cache, &cache, sizeof(cache)) != 0) { |
297a533b LPC |
462 | di->cache = cache; |
463 | power_supply_changed(&di->bat); | |
464 | } | |
465 | ||
466 | di->last_update = jiffies; | |
467 | } | |
468 | ||
740b755a LPC |
469 | static void bq27x00_battery_poll(struct work_struct *work) |
470 | { | |
471 | struct bq27x00_device_info *di = | |
472 | container_of(work, struct bq27x00_device_info, work.work); | |
473 | ||
474 | bq27x00_update(di); | |
475 | ||
476 | if (poll_interval > 0) { | |
477 | /* The timer does not have to be accurate. */ | |
478 | set_timer_slack(&di->work.timer, poll_interval * HZ / 4); | |
479 | schedule_delayed_work(&di->work, poll_interval * HZ); | |
480 | } | |
481 | } | |
482 | ||
b996ad0e | 483 | /* |
bf7d4140 | 484 | * Return the battery average current in µA |
b996ad0e RG |
485 | * Note that current can be negative signed as well |
486 | * Or 0 if something fails. | |
487 | */ | |
297a533b LPC |
488 | static int bq27x00_battery_current(struct bq27x00_device_info *di, |
489 | union power_supply_propval *val) | |
b996ad0e | 490 | { |
297a533b | 491 | int curr; |
b68f6216 | 492 | int flags; |
b996ad0e | 493 | |
b68f6216 | 494 | curr = bq27x00_read(di, BQ27x00_REG_AI, false); |
c6cd4f26 PR |
495 | if (curr < 0) { |
496 | dev_err(di->dev, "error reading current\n"); | |
297a533b | 497 | return curr; |
c6cd4f26 | 498 | } |
e20908d9 | 499 | |
a66f59ba | 500 | if (bq27xxx_is_chip_version_higher(di)) { |
e20908d9 | 501 | /* bq27500 returns signed value */ |
297a533b | 502 | val->intval = (int)((s16)curr) * 1000; |
e20908d9 | 503 | } else { |
b68f6216 PR |
504 | flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false); |
505 | if (flags & BQ27000_FLAG_CHGS) { | |
e20908d9 | 506 | dev_dbg(di->dev, "negative current!\n"); |
afbc74fd | 507 | curr = -curr; |
e20908d9 | 508 | } |
b996ad0e | 509 | |
297a533b | 510 | val->intval = curr * 3570 / BQ27000_RS; |
b996ad0e RG |
511 | } |
512 | ||
297a533b | 513 | return 0; |
b996ad0e RG |
514 | } |
515 | ||
4e924a81 | 516 | static int bq27x00_battery_status(struct bq27x00_device_info *di, |
297a533b | 517 | union power_supply_propval *val) |
4e924a81 | 518 | { |
4e924a81 | 519 | int status; |
4e924a81 | 520 | |
a66f59ba | 521 | if (bq27xxx_is_chip_version_higher(di)) { |
297a533b | 522 | if (di->cache.flags & BQ27500_FLAG_FC) |
4e924a81 | 523 | status = POWER_SUPPLY_STATUS_FULL; |
b7aaacf5 | 524 | else if (di->cache.flags & BQ27500_FLAG_DSC) |
4e924a81 | 525 | status = POWER_SUPPLY_STATUS_DISCHARGING; |
270968c0 | 526 | else |
b7aaacf5 | 527 | status = POWER_SUPPLY_STATUS_CHARGING; |
4e924a81 | 528 | } else { |
c1b9ab67 LPC |
529 | if (di->cache.flags & BQ27000_FLAG_FC) |
530 | status = POWER_SUPPLY_STATUS_FULL; | |
531 | else if (di->cache.flags & BQ27000_FLAG_CHGS) | |
4e924a81 | 532 | status = POWER_SUPPLY_STATUS_CHARGING; |
c1b9ab67 LPC |
533 | else if (power_supply_am_i_supplied(&di->bat)) |
534 | status = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
4e924a81 GI |
535 | else |
536 | status = POWER_SUPPLY_STATUS_DISCHARGING; | |
537 | } | |
538 | ||
539 | val->intval = status; | |
297a533b | 540 | |
4e924a81 GI |
541 | return 0; |
542 | } | |
543 | ||
d66bab3f PR |
544 | static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di, |
545 | union power_supply_propval *val) | |
546 | { | |
547 | int level; | |
548 | ||
a66f59ba | 549 | if (bq27xxx_is_chip_version_higher(di)) { |
d66bab3f PR |
550 | if (di->cache.flags & BQ27500_FLAG_FC) |
551 | level = POWER_SUPPLY_CAPACITY_LEVEL_FULL; | |
552 | else if (di->cache.flags & BQ27500_FLAG_SOC1) | |
553 | level = POWER_SUPPLY_CAPACITY_LEVEL_LOW; | |
554 | else if (di->cache.flags & BQ27500_FLAG_SOCF) | |
555 | level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; | |
556 | else | |
557 | level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; | |
558 | } else { | |
559 | if (di->cache.flags & BQ27000_FLAG_FC) | |
560 | level = POWER_SUPPLY_CAPACITY_LEVEL_FULL; | |
561 | else if (di->cache.flags & BQ27000_FLAG_EDV1) | |
562 | level = POWER_SUPPLY_CAPACITY_LEVEL_LOW; | |
563 | else if (di->cache.flags & BQ27000_FLAG_EDVF) | |
564 | level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; | |
565 | else | |
566 | level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; | |
567 | } | |
568 | ||
569 | val->intval = level; | |
570 | ||
571 | return 0; | |
572 | } | |
573 | ||
4e924a81 | 574 | /* |
91fe4d50 | 575 | * Return the battery Voltage in millivolts |
297a533b | 576 | * Or < 0 if something fails. |
4e924a81 | 577 | */ |
297a533b LPC |
578 | static int bq27x00_battery_voltage(struct bq27x00_device_info *di, |
579 | union power_supply_propval *val) | |
4e924a81 | 580 | { |
297a533b | 581 | int volt; |
4e924a81 | 582 | |
297a533b | 583 | volt = bq27x00_read(di, BQ27x00_REG_VOLT, false); |
c6cd4f26 PR |
584 | if (volt < 0) { |
585 | dev_err(di->dev, "error reading voltage\n"); | |
297a533b | 586 | return volt; |
c6cd4f26 | 587 | } |
4e924a81 | 588 | |
297a533b LPC |
589 | val->intval = volt * 1000; |
590 | ||
591 | return 0; | |
592 | } | |
593 | ||
594 | static int bq27x00_simple_value(int value, | |
595 | union power_supply_propval *val) | |
596 | { | |
597 | if (value < 0) | |
598 | return value; | |
599 | ||
600 | val->intval = value; | |
4e924a81 | 601 | |
4e924a81 GI |
602 | return 0; |
603 | } | |
604 | ||
b996ad0e RG |
605 | #define to_bq27x00_device_info(x) container_of((x), \ |
606 | struct bq27x00_device_info, bat); | |
607 | ||
608 | static int bq27x00_battery_get_property(struct power_supply *psy, | |
609 | enum power_supply_property psp, | |
610 | union power_supply_propval *val) | |
611 | { | |
4e924a81 | 612 | int ret = 0; |
b996ad0e | 613 | struct bq27x00_device_info *di = to_bq27x00_device_info(psy); |
3413b4ea | 614 | |
740b755a LPC |
615 | mutex_lock(&di->lock); |
616 | if (time_is_before_jiffies(di->last_update + 5 * HZ)) { | |
617 | cancel_delayed_work_sync(&di->work); | |
618 | bq27x00_battery_poll(&di->work.work); | |
619 | } | |
620 | mutex_unlock(&di->lock); | |
297a533b LPC |
621 | |
622 | if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0) | |
3413b4ea | 623 | return -ENODEV; |
b996ad0e RG |
624 | |
625 | switch (psp) { | |
4e924a81 GI |
626 | case POWER_SUPPLY_PROP_STATUS: |
627 | ret = bq27x00_battery_status(di, val); | |
628 | break; | |
b996ad0e | 629 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
297a533b | 630 | ret = bq27x00_battery_voltage(di, val); |
3413b4ea | 631 | break; |
b996ad0e | 632 | case POWER_SUPPLY_PROP_PRESENT: |
297a533b | 633 | val->intval = di->cache.flags < 0 ? 0 : 1; |
b996ad0e RG |
634 | break; |
635 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
297a533b | 636 | ret = bq27x00_battery_current(di, val); |
b996ad0e RG |
637 | break; |
638 | case POWER_SUPPLY_PROP_CAPACITY: | |
297a533b | 639 | ret = bq27x00_simple_value(di->cache.capacity, val); |
b996ad0e | 640 | break; |
d66bab3f PR |
641 | case POWER_SUPPLY_PROP_CAPACITY_LEVEL: |
642 | ret = bq27x00_battery_capacity_level(di, val); | |
643 | break; | |
b996ad0e | 644 | case POWER_SUPPLY_PROP_TEMP: |
d149e98e | 645 | ret = bq27x00_simple_value(di->cache.temperature, val); |
5dc3443e PR |
646 | if (ret == 0) |
647 | val->intval -= 2731; | |
b996ad0e | 648 | break; |
4e924a81 | 649 | case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW: |
297a533b | 650 | ret = bq27x00_simple_value(di->cache.time_to_empty, val); |
4e924a81 GI |
651 | break; |
652 | case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG: | |
297a533b | 653 | ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val); |
4e924a81 GI |
654 | break; |
655 | case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW: | |
297a533b | 656 | ret = bq27x00_simple_value(di->cache.time_to_full, val); |
4e924a81 | 657 | break; |
5661f334 LPC |
658 | case POWER_SUPPLY_PROP_TECHNOLOGY: |
659 | val->intval = POWER_SUPPLY_TECHNOLOGY_LION; | |
660 | break; | |
631c17ee PR |
661 | case POWER_SUPPLY_PROP_CHARGE_NOW: |
662 | ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val); | |
663 | break; | |
664 | case POWER_SUPPLY_PROP_CHARGE_FULL: | |
665 | ret = bq27x00_simple_value(di->cache.charge_full, val); | |
666 | break; | |
667 | case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: | |
668 | ret = bq27x00_simple_value(di->charge_design_full, val); | |
669 | break; | |
73c244a8 PR |
670 | case POWER_SUPPLY_PROP_CYCLE_COUNT: |
671 | ret = bq27x00_simple_value(di->cache.cycle_count, val); | |
631c17ee PR |
672 | break; |
673 | case POWER_SUPPLY_PROP_ENERGY_NOW: | |
a8f6bd23 | 674 | ret = bq27x00_simple_value(di->cache.energy, val); |
631c17ee | 675 | break; |
9903e627 SR |
676 | case POWER_SUPPLY_PROP_POWER_AVG: |
677 | ret = bq27x00_simple_value(di->cache.power_avg, val); | |
678 | break; | |
679 | case POWER_SUPPLY_PROP_HEALTH: | |
680 | ret = bq27x00_simple_value(di->cache.health, val); | |
681 | break; | |
b996ad0e RG |
682 | default: |
683 | return -EINVAL; | |
684 | } | |
685 | ||
4e924a81 | 686 | return ret; |
b996ad0e RG |
687 | } |
688 | ||
740b755a LPC |
689 | static void bq27x00_external_power_changed(struct power_supply *psy) |
690 | { | |
691 | struct bq27x00_device_info *di = to_bq27x00_device_info(psy); | |
692 | ||
693 | cancel_delayed_work_sync(&di->work); | |
694 | schedule_delayed_work(&di->work, 0); | |
695 | } | |
696 | ||
a40402ef | 697 | static int bq27x00_powersupply_init(struct bq27x00_device_info *di) |
b996ad0e | 698 | { |
a40402ef LPC |
699 | int ret; |
700 | ||
b996ad0e | 701 | di->bat.type = POWER_SUPPLY_TYPE_BATTERY; |
a66f59ba SG |
702 | if (di->chip == BQ27425) { |
703 | di->bat.properties = bq27425_battery_props; | |
704 | di->bat.num_properties = ARRAY_SIZE(bq27425_battery_props); | |
705 | } else { | |
706 | di->bat.properties = bq27x00_battery_props; | |
707 | di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props); | |
708 | } | |
b996ad0e | 709 | di->bat.get_property = bq27x00_battery_get_property; |
740b755a LPC |
710 | di->bat.external_power_changed = bq27x00_external_power_changed; |
711 | ||
712 | INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll); | |
713 | mutex_init(&di->lock); | |
a40402ef LPC |
714 | |
715 | ret = power_supply_register(di->dev, &di->bat); | |
716 | if (ret) { | |
717 | dev_err(di->dev, "failed to register battery: %d\n", ret); | |
718 | return ret; | |
719 | } | |
720 | ||
721 | dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION); | |
722 | ||
297a533b LPC |
723 | bq27x00_update(di); |
724 | ||
a40402ef | 725 | return 0; |
b996ad0e RG |
726 | } |
727 | ||
740b755a LPC |
728 | static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di) |
729 | { | |
8cfaaa81 PR |
730 | /* |
731 | * power_supply_unregister call bq27x00_battery_get_property which | |
732 | * call bq27x00_battery_poll. | |
733 | * Make sure that bq27x00_battery_poll will not call | |
734 | * schedule_delayed_work again after unregister (which cause OOPS). | |
735 | */ | |
736 | poll_interval = 0; | |
737 | ||
740b755a LPC |
738 | cancel_delayed_work_sync(&di->work); |
739 | ||
740 | power_supply_unregister(&di->bat); | |
741 | ||
742 | mutex_destroy(&di->lock); | |
743 | } | |
744 | ||
7fb7ba58 LPC |
745 | |
746 | /* i2c specific code */ | |
747 | #ifdef CONFIG_BATTERY_BQ27X00_I2C | |
748 | ||
749 | /* If the system has several batteries we need a different name for each | |
750 | * of them... | |
b996ad0e | 751 | */ |
7fb7ba58 LPC |
752 | static DEFINE_IDR(battery_id); |
753 | static DEFINE_MUTEX(battery_mutex); | |
b996ad0e | 754 | |
297a533b | 755 | static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single) |
b996ad0e | 756 | { |
a40402ef | 757 | struct i2c_client *client = to_i2c_client(di->dev); |
9e912f45 | 758 | struct i2c_msg msg[2]; |
b996ad0e | 759 | unsigned char data[2]; |
297a533b | 760 | int ret; |
b996ad0e RG |
761 | |
762 | if (!client->adapter) | |
763 | return -ENODEV; | |
764 | ||
9e912f45 GI |
765 | msg[0].addr = client->addr; |
766 | msg[0].flags = 0; | |
767 | msg[0].buf = ® | |
768 | msg[0].len = sizeof(reg); | |
769 | msg[1].addr = client->addr; | |
770 | msg[1].flags = I2C_M_RD; | |
771 | msg[1].buf = data; | |
2ec523a8 | 772 | if (single) |
9e912f45 | 773 | msg[1].len = 1; |
2ec523a8 | 774 | else |
9e912f45 | 775 | msg[1].len = 2; |
2ec523a8 | 776 | |
9e912f45 | 777 | ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg)); |
2ec523a8 LPC |
778 | if (ret < 0) |
779 | return ret; | |
780 | ||
781 | if (!single) | |
782 | ret = get_unaligned_le16(data); | |
783 | else | |
784 | ret = data[0]; | |
b996ad0e | 785 | |
297a533b | 786 | return ret; |
b996ad0e RG |
787 | } |
788 | ||
e20908d9 | 789 | static int bq27x00_battery_probe(struct i2c_client *client, |
b996ad0e RG |
790 | const struct i2c_device_id *id) |
791 | { | |
792 | char *name; | |
793 | struct bq27x00_device_info *di; | |
b996ad0e RG |
794 | int num; |
795 | int retval = 0; | |
796 | ||
797 | /* Get new ID for the new battery device */ | |
b996ad0e | 798 | mutex_lock(&battery_mutex); |
05e2cefa | 799 | num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL); |
b996ad0e | 800 | mutex_unlock(&battery_mutex); |
05e2cefa TH |
801 | if (num < 0) |
802 | return num; | |
b996ad0e | 803 | |
e20908d9 | 804 | name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num); |
b996ad0e RG |
805 | if (!name) { |
806 | dev_err(&client->dev, "failed to allocate device name\n"); | |
807 | retval = -ENOMEM; | |
808 | goto batt_failed_1; | |
809 | } | |
810 | ||
1cb82fdb | 811 | di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL); |
b996ad0e RG |
812 | if (!di) { |
813 | dev_err(&client->dev, "failed to allocate device info data\n"); | |
814 | retval = -ENOMEM; | |
815 | goto batt_failed_2; | |
816 | } | |
a40402ef | 817 | |
b996ad0e | 818 | di->id = num; |
a40402ef | 819 | di->dev = &client->dev; |
e20908d9 | 820 | di->chip = id->driver_data; |
a40402ef LPC |
821 | di->bat.name = name; |
822 | di->bus.read = &bq27x00_read_i2c; | |
b996ad0e | 823 | |
f7760995 JL |
824 | retval = bq27x00_powersupply_init(di); |
825 | if (retval) | |
1cb82fdb | 826 | goto batt_failed_2; |
b996ad0e RG |
827 | |
828 | i2c_set_clientdata(client, di); | |
b996ad0e RG |
829 | |
830 | return 0; | |
831 | ||
b996ad0e RG |
832 | batt_failed_2: |
833 | kfree(name); | |
834 | batt_failed_1: | |
835 | mutex_lock(&battery_mutex); | |
836 | idr_remove(&battery_id, num); | |
837 | mutex_unlock(&battery_mutex); | |
838 | ||
839 | return retval; | |
840 | } | |
841 | ||
e20908d9 | 842 | static int bq27x00_battery_remove(struct i2c_client *client) |
b996ad0e RG |
843 | { |
844 | struct bq27x00_device_info *di = i2c_get_clientdata(client); | |
845 | ||
740b755a | 846 | bq27x00_powersupply_unregister(di); |
b996ad0e RG |
847 | |
848 | kfree(di->bat.name); | |
849 | ||
850 | mutex_lock(&battery_mutex); | |
851 | idr_remove(&battery_id, di->id); | |
852 | mutex_unlock(&battery_mutex); | |
853 | ||
b996ad0e RG |
854 | return 0; |
855 | } | |
856 | ||
e20908d9 GI |
857 | static const struct i2c_device_id bq27x00_id[] = { |
858 | { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */ | |
859 | { "bq27500", BQ27500 }, | |
a66f59ba | 860 | { "bq27425", BQ27425 }, |
b996ad0e RG |
861 | {}, |
862 | }; | |
fd9b958c | 863 | MODULE_DEVICE_TABLE(i2c, bq27x00_id); |
b996ad0e | 864 | |
e20908d9 | 865 | static struct i2c_driver bq27x00_battery_driver = { |
b996ad0e | 866 | .driver = { |
e20908d9 | 867 | .name = "bq27x00-battery", |
b996ad0e | 868 | }, |
e20908d9 GI |
869 | .probe = bq27x00_battery_probe, |
870 | .remove = bq27x00_battery_remove, | |
871 | .id_table = bq27x00_id, | |
b996ad0e RG |
872 | }; |
873 | ||
7fb7ba58 LPC |
874 | static inline int bq27x00_battery_i2c_init(void) |
875 | { | |
876 | int ret = i2c_add_driver(&bq27x00_battery_driver); | |
877 | if (ret) | |
878 | printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n"); | |
879 | ||
880 | return ret; | |
881 | } | |
882 | ||
883 | static inline void bq27x00_battery_i2c_exit(void) | |
884 | { | |
885 | i2c_del_driver(&bq27x00_battery_driver); | |
886 | } | |
887 | ||
888 | #else | |
889 | ||
890 | static inline int bq27x00_battery_i2c_init(void) { return 0; } | |
891 | static inline void bq27x00_battery_i2c_exit(void) {}; | |
892 | ||
893 | #endif | |
894 | ||
895 | /* platform specific code */ | |
896 | #ifdef CONFIG_BATTERY_BQ27X00_PLATFORM | |
897 | ||
898 | static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg, | |
297a533b | 899 | bool single) |
7fb7ba58 LPC |
900 | { |
901 | struct device *dev = di->dev; | |
902 | struct bq27000_platform_data *pdata = dev->platform_data; | |
903 | unsigned int timeout = 3; | |
904 | int upper, lower; | |
905 | int temp; | |
906 | ||
907 | if (!single) { | |
908 | /* Make sure the value has not changed in between reading the | |
909 | * lower and the upper part */ | |
910 | upper = pdata->read(dev, reg + 1); | |
911 | do { | |
912 | temp = upper; | |
913 | if (upper < 0) | |
914 | return upper; | |
915 | ||
916 | lower = pdata->read(dev, reg); | |
917 | if (lower < 0) | |
918 | return lower; | |
919 | ||
920 | upper = pdata->read(dev, reg + 1); | |
921 | } while (temp != upper && --timeout); | |
922 | ||
923 | if (timeout == 0) | |
924 | return -EIO; | |
925 | ||
297a533b | 926 | return (upper << 8) | lower; |
7fb7ba58 | 927 | } |
297a533b LPC |
928 | |
929 | return pdata->read(dev, reg); | |
7fb7ba58 LPC |
930 | } |
931 | ||
c8afa640 | 932 | static int bq27000_battery_probe(struct platform_device *pdev) |
7fb7ba58 LPC |
933 | { |
934 | struct bq27x00_device_info *di; | |
935 | struct bq27000_platform_data *pdata = pdev->dev.platform_data; | |
7fb7ba58 LPC |
936 | |
937 | if (!pdata) { | |
938 | dev_err(&pdev->dev, "no platform_data supplied\n"); | |
939 | return -EINVAL; | |
940 | } | |
941 | ||
942 | if (!pdata->read) { | |
943 | dev_err(&pdev->dev, "no hdq read callback supplied\n"); | |
944 | return -EINVAL; | |
945 | } | |
946 | ||
1cb82fdb | 947 | di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL); |
7fb7ba58 LPC |
948 | if (!di) { |
949 | dev_err(&pdev->dev, "failed to allocate device info data\n"); | |
950 | return -ENOMEM; | |
951 | } | |
952 | ||
953 | platform_set_drvdata(pdev, di); | |
954 | ||
955 | di->dev = &pdev->dev; | |
956 | di->chip = BQ27000; | |
957 | ||
958 | di->bat.name = pdata->name ?: dev_name(&pdev->dev); | |
959 | di->bus.read = &bq27000_read_platform; | |
960 | ||
1cb82fdb | 961 | return bq27x00_powersupply_init(di); |
7fb7ba58 LPC |
962 | } |
963 | ||
415ec69f | 964 | static int bq27000_battery_remove(struct platform_device *pdev) |
7fb7ba58 LPC |
965 | { |
966 | struct bq27x00_device_info *di = platform_get_drvdata(pdev); | |
967 | ||
740b755a LPC |
968 | bq27x00_powersupply_unregister(di); |
969 | ||
7fb7ba58 LPC |
970 | return 0; |
971 | } | |
972 | ||
973 | static struct platform_driver bq27000_battery_driver = { | |
974 | .probe = bq27000_battery_probe, | |
28ea73f4 | 975 | .remove = bq27000_battery_remove, |
7fb7ba58 LPC |
976 | .driver = { |
977 | .name = "bq27000-battery", | |
978 | .owner = THIS_MODULE, | |
979 | }, | |
980 | }; | |
981 | ||
982 | static inline int bq27x00_battery_platform_init(void) | |
983 | { | |
984 | int ret = platform_driver_register(&bq27000_battery_driver); | |
985 | if (ret) | |
986 | printk(KERN_ERR "Unable to register BQ27000 platform driver\n"); | |
987 | ||
988 | return ret; | |
989 | } | |
990 | ||
991 | static inline void bq27x00_battery_platform_exit(void) | |
992 | { | |
993 | platform_driver_unregister(&bq27000_battery_driver); | |
994 | } | |
995 | ||
996 | #else | |
997 | ||
998 | static inline int bq27x00_battery_platform_init(void) { return 0; } | |
999 | static inline void bq27x00_battery_platform_exit(void) {}; | |
1000 | ||
1001 | #endif | |
1002 | ||
1003 | /* | |
1004 | * Module stuff | |
1005 | */ | |
1006 | ||
b996ad0e RG |
1007 | static int __init bq27x00_battery_init(void) |
1008 | { | |
1009 | int ret; | |
1010 | ||
7fb7ba58 LPC |
1011 | ret = bq27x00_battery_i2c_init(); |
1012 | if (ret) | |
1013 | return ret; | |
1014 | ||
1015 | ret = bq27x00_battery_platform_init(); | |
b996ad0e | 1016 | if (ret) |
7fb7ba58 | 1017 | bq27x00_battery_i2c_exit(); |
b996ad0e RG |
1018 | |
1019 | return ret; | |
1020 | } | |
1021 | module_init(bq27x00_battery_init); | |
1022 | ||
1023 | static void __exit bq27x00_battery_exit(void) | |
1024 | { | |
7fb7ba58 LPC |
1025 | bq27x00_battery_platform_exit(); |
1026 | bq27x00_battery_i2c_exit(); | |
b996ad0e RG |
1027 | } |
1028 | module_exit(bq27x00_battery_exit); | |
1029 | ||
1030 | MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>"); | |
1031 | MODULE_DESCRIPTION("BQ27x00 battery monitor driver"); | |
1032 | MODULE_LICENSE("GPL"); |