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Merge branch 'pm-qos'
[deliverable/linux.git] / drivers / power / bq27x00_battery.c
CommitLineData
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
628ef02c 26 * http://www.ti.com/product/BQ27742-G1
631c17ee
PR		 27 */
28
1cb82fdb 29#include <linux/device.h>
b996ad0e
RG		 30#include <linux/module.h>
31#include <linux/param.h>
32#include <linux/jiffies.h>
33#include <linux/workqueue.h>
34#include <linux/delay.h>
35#include <linux/platform_device.h>
36#include <linux/power_supply.h>
37#include <linux/idr.h>
b996ad0e 38#include <linux/i2c.h>
5a0e3ad6 39#include <linux/slab.h>
8aef7e8f 40#include <asm/unaligned.h>
b996ad0e 41
7fb7ba58
LPC		 42#include <linux/power/bq27x00_battery.h>
43
631c17ee 44#define DRIVER_VERSION "1.2.0"
b996ad0e
RG		 45
46#define BQ27x00_REG_TEMP 0x06
47#define BQ27x00_REG_VOLT 0x08
b996ad0e
RG		 48#define BQ27x00_REG_AI 0x14
49#define BQ27x00_REG_FLAGS 0x0A
4e924a81
GI		 50#define BQ27x00_REG_TTE 0x16
51#define BQ27x00_REG_TTF 0x18
52#define BQ27x00_REG_TTECP 0x26
202e0116 53#define BQ27x00_REG_NAC 0x0C /* Nominal available capacity */
631c17ee
PR		 54#define BQ27x00_REG_LMD 0x12 /* Last measured discharge */
55#define BQ27x00_REG_CYCT 0x2A /* Cycle count total */
202e0116 56#define BQ27x00_REG_AE 0x22 /* Available energy */
9903e627 57#define BQ27x00_POWER_AVG 0x24
b996ad0e 58
e20908d9 59#define BQ27000_REG_RSOC 0x0B /* Relative State-of-Charge */
631c17ee 60#define BQ27000_REG_ILMD 0x76 /* Initial last measured discharge */
d66bab3f
PR		 61#define BQ27000_FLAG_EDVF BIT(0) /* Final End-of-Discharge-Voltage flag */
62#define BQ27000_FLAG_EDV1 BIT(1) /* First End-of-Discharge-Voltage flag */
4b226c2c 63#define BQ27000_FLAG_CI BIT(4) /* Capacity Inaccurate flag */
c1b9ab67 64#define BQ27000_FLAG_FC BIT(5)
d66bab3f 65#define BQ27000_FLAG_CHGS BIT(7) /* Charge state flag */
e20908d9 66
bf7d4140 67#define BQ27500_REG_SOC 0x2C
631c17ee 68#define BQ27500_REG_DCAP 0x3C /* Design capacity */
b7aaacf5 69#define BQ27500_FLAG_DSC BIT(0)
d66bab3f
PR		 70#define BQ27500_FLAG_SOCF BIT(1) /* State-of-Charge threshold final */
71#define BQ27500_FLAG_SOC1 BIT(2) /* State-of-Charge threshold 1 */
b7aaacf5 72#define BQ27500_FLAG_FC BIT(9)
9903e627 73#define BQ27500_FLAG_OTC BIT(15)
e20908d9 74
628ef02c
PV		 75#define BQ27742_POWER_AVG 0x76
76
a66f59ba
SG		 77/* bq27425 register addresses are same as bq27x00 addresses minus 4 */
78#define BQ27425_REG_OFFSET 0x04
79#define BQ27425_REG_SOC 0x18 /* Register address plus offset */
80
a2e5118c 81#define BQ27000_RS 20 /* Resistor sense */
9903e627 82#define BQ27x00_POWER_CONSTANT (256 * 29200 / 1000)
a2e5118c 83
b996ad0e
RG		 84struct bq27x00_device_info;
85struct bq27x00_access_methods {
297a533b 86 int (*read)(struct bq27x00_device_info *di, u8 reg, bool single);
b996ad0e
RG		 87};
88
628ef02c 89enum bq27x00_chip { BQ27000, BQ27500, BQ27425, BQ27742};
e20908d9 90
297a533b
LPC		 91struct bq27x00_reg_cache {
92 int temperature;
93 int time_to_empty;
94 int time_to_empty_avg;
95 int time_to_full;
631c17ee 96 int charge_full;
73c244a8 97 int cycle_count;
297a533b 98 int capacity;
a8f6bd23 99 int energy;
297a533b 100 int flags;
9903e627
SR		 101 int power_avg;
102 int health;
297a533b
LPC		 103};
104
b996ad0e
RG		 105struct bq27x00_device_info {
106 struct device *dev;
107 int id;
e20908d9 108 enum bq27x00_chip chip;
b996ad0e 109
297a533b 110 struct bq27x00_reg_cache cache;
631c17ee
PR		 111 int charge_design_full;
112
297a533b 113 unsigned long last_update;
740b755a 114 struct delayed_work work;
297a533b 115
a40402ef
LPC		 116 struct power_supply bat;
117
118 struct bq27x00_access_methods bus;
740b755a
LPC		 119
120 struct mutex lock;
b996ad0e
RG		 121};
122
123static enum power_supply_property bq27x00_battery_props[] = {
4e924a81 124 POWER_SUPPLY_PROP_STATUS,
b996ad0e
RG		 125 POWER_SUPPLY_PROP_PRESENT,
126 POWER_SUPPLY_PROP_VOLTAGE_NOW,
127 POWER_SUPPLY_PROP_CURRENT_NOW,
128 POWER_SUPPLY_PROP_CAPACITY,
d66bab3f 129 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
b996ad0e 130 POWER_SUPPLY_PROP_TEMP,
4e924a81
GI		 131 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
132 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
133 POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
5661f334 134 POWER_SUPPLY_PROP_TECHNOLOGY,
631c17ee
PR		 135 POWER_SUPPLY_PROP_CHARGE_FULL,
136 POWER_SUPPLY_PROP_CHARGE_NOW,
137 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
73c244a8 138 POWER_SUPPLY_PROP_CYCLE_COUNT,
631c17ee 139 POWER_SUPPLY_PROP_ENERGY_NOW,
9903e627
SR		 140 POWER_SUPPLY_PROP_POWER_AVG,
141 POWER_SUPPLY_PROP_HEALTH,
b996ad0e
RG		 142};
143
a66f59ba
SG		 144static enum power_supply_property bq27425_battery_props[] = {
145 POWER_SUPPLY_PROP_STATUS,
146 POWER_SUPPLY_PROP_PRESENT,
147 POWER_SUPPLY_PROP_VOLTAGE_NOW,
148 POWER_SUPPLY_PROP_CURRENT_NOW,
149 POWER_SUPPLY_PROP_CAPACITY,
150 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
151 POWER_SUPPLY_PROP_TEMP,
152 POWER_SUPPLY_PROP_TECHNOLOGY,
153 POWER_SUPPLY_PROP_CHARGE_FULL,
154 POWER_SUPPLY_PROP_CHARGE_NOW,
155 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
156};
157
628ef02c
PV		 158static enum power_supply_property bq27742_battery_props[] = {
159 POWER_SUPPLY_PROP_STATUS,
160 POWER_SUPPLY_PROP_PRESENT,
161 POWER_SUPPLY_PROP_VOLTAGE_NOW,
162 POWER_SUPPLY_PROP_CURRENT_NOW,
163 POWER_SUPPLY_PROP_CAPACITY,
164 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
165 POWER_SUPPLY_PROP_TEMP,
166 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
167 POWER_SUPPLY_PROP_TECHNOLOGY,
168 POWER_SUPPLY_PROP_CHARGE_FULL,
169 POWER_SUPPLY_PROP_CHARGE_NOW,
170 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
171 POWER_SUPPLY_PROP_CYCLE_COUNT,
172 POWER_SUPPLY_PROP_POWER_AVG,
173 POWER_SUPPLY_PROP_HEALTH,
174};
175
740b755a
LPC		 176static unsigned int poll_interval = 360;
177module_param(poll_interval, uint, 0644);
178MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \
179 "0 disables polling");
180
b996ad0e
RG		 181/*
182 * Common code for BQ27x00 devices
183 */
184
a40402ef 185static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg,
297a533b 186 bool single)
b996ad0e 187{
a66f59ba
SG		 188 if (di->chip == BQ27425)
189 return di->bus.read(di, reg - BQ27425_REG_OFFSET, single);
297a533b 190 return di->bus.read(di, reg, single);
b996ad0e
RG		 191}
192
a66f59ba
SG		 193/*
194 * Higher versions of the chip like BQ27425 and BQ27500
195 * differ from BQ27000 and BQ27200 in calculation of certain
196 * parameters. Hence we need to check for the chip type.
197 */
198static bool bq27xxx_is_chip_version_higher(struct bq27x00_device_info *di)
199{
628ef02c 200 if (di->chip == BQ27425 || di->chip == BQ27500 || di->chip == BQ27742)
a66f59ba
SG		 201 return true;
202 return false;
203}
204
b996ad0e 205/*
297a533b 206 * Return the battery Relative State-of-Charge
b996ad0e
RG		 207 * Or < 0 if something fails.
208 */
297a533b 209static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di)
b996ad0e 210{
297a533b 211 int rsoc;
b996ad0e 212
628ef02c 213 if (di->chip == BQ27500 || di->chip == BQ27742)
297a533b 214 rsoc = bq27x00_read(di, BQ27500_REG_SOC, false);
a66f59ba
SG		 215 else if (di->chip == BQ27425)
216 rsoc = bq27x00_read(di, BQ27425_REG_SOC, false);
e20908d9 217 else
297a533b
LPC		 218 rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true);
219
220 if (rsoc < 0)
c6cd4f26 221 dev_dbg(di->dev, "error reading relative State-of-Charge\n");
297a533b
LPC		 222
223 return rsoc;
b996ad0e
RG		 224}
225
631c17ee
PR		 226/*
227 * Return a battery charge value in µAh
228 * Or < 0 if something fails.
229 */
230static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
231{
232 int charge;
233
234 charge = bq27x00_read(di, reg, false);
235 if (charge < 0) {
c6cd4f26
PR		 236 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
237 reg, charge);
631c17ee
PR		 238 return charge;
239 }
240
a66f59ba 241 if (bq27xxx_is_chip_version_higher(di))
631c17ee
PR		 242 charge *= 1000;
243 else
244 charge = charge * 3570 / BQ27000_RS;
245
246 return charge;
247}
248
249/*
250 * Return the battery Nominal available capaciy in µAh
251 * Or < 0 if something fails.
252 */
253static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
254{
e59ec4a1
PR		 255 int flags;
256 bool is_bq27500 = di->chip == BQ27500;
a3c0c3e7 257 bool is_bq27742 = di->chip == BQ27742;
e59ec4a1 258 bool is_higher = bq27xxx_is_chip_version_higher(di);
a3c0c3e7 259 bool flags_1b = !(is_bq27500 || is_bq27742);
e59ec4a1 260
a3c0c3e7 261 flags = bq27x00_read(di, BQ27x00_REG_FLAGS, flags_1b);
e59ec4a1
PR		 262 if (flags >= 0 && !is_higher && (flags & BQ27000_FLAG_CI))
263 return -ENODATA;
264
631c17ee
PR		 265 return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
266}
267
268/*
269 * Return the battery Last measured discharge in µAh
270 * Or < 0 if something fails.
271 */
272static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
273{
274 return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD);
275}
276
277/*
278 * Return the battery Initial last measured discharge in µAh
279 * Or < 0 if something fails.
280 */
281static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
282{
283 int ilmd;
284
a66f59ba 285 if (bq27xxx_is_chip_version_higher(di))
631c17ee
PR		 286 ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
287 else
288 ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);
289
290 if (ilmd < 0) {
c6cd4f26 291 dev_dbg(di->dev, "error reading initial last measured discharge\n");
631c17ee
PR		 292 return ilmd;
293 }
294
a66f59ba 295 if (bq27xxx_is_chip_version_higher(di))
631c17ee
PR		 296 ilmd *= 1000;
297 else
298 ilmd = ilmd * 256 * 3570 / BQ27000_RS;
299
300 return ilmd;
301}
302
a8f6bd23
PR		 303/*
304 * Return the battery Available energy in µWh
305 * Or < 0 if something fails.
306 */
307static int bq27x00_battery_read_energy(struct bq27x00_device_info *di)
308{
309 int ae;
310
311 ae = bq27x00_read(di, BQ27x00_REG_AE, false);
312 if (ae < 0) {
c6cd4f26 313 dev_dbg(di->dev, "error reading available energy\n");
a8f6bd23
PR		 314 return ae;
315 }
316
317 if (di->chip == BQ27500)
318 ae *= 1000;
319 else
320 ae = ae * 29200 / BQ27000_RS;
321
322 return ae;
323}
324
d149e98e 325/*
5dc3443e 326 * Return the battery temperature in tenths of degree Kelvin
d149e98e
PR		 327 * Or < 0 if something fails.
328 */
329static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di)
330{
331 int temp;
332
333 temp = bq27x00_read(di, BQ27x00_REG_TEMP, false);
334 if (temp < 0) {
335 dev_err(di->dev, "error reading temperature\n");
336 return temp;
337 }
338
5dc3443e
PR		 339 if (!bq27xxx_is_chip_version_higher(di))
340 temp = 5 * temp / 2;
d149e98e
PR		 341
342 return temp;
343}
344
631c17ee
PR		 345/*
346 * Return the battery Cycle count total
347 * Or < 0 if something fails.
348 */
349static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
350{
351 int cyct;
352
353 cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
354 if (cyct < 0)
355 dev_err(di->dev, "error reading cycle count total\n");
356
357 return cyct;
358}
359
b996ad0e 360/*
297a533b
LPC		 361 * Read a time register.
362 * Return < 0 if something fails.
b996ad0e 363 */
297a533b 364static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
b996ad0e 365{
297a533b 366 int tval;
b996ad0e 367
297a533b
LPC		 368 tval = bq27x00_read(di, reg, false);
369 if (tval < 0) {
c6cd4f26
PR		 370 dev_dbg(di->dev, "error reading time register %02x: %d\n",
371 reg, tval);
297a533b 372 return tval;
b996ad0e
RG		 373 }
374
297a533b
LPC		 375 if (tval == 65535)
376 return -ENODATA;
377
378 return tval * 60;
379}
380
9903e627
SR		 381/*
382 * Read a power avg register.
383 * Return < 0 if something fails.
384 */
385static int bq27x00_battery_read_pwr_avg(struct bq27x00_device_info *di, u8 reg)
386{
387 int tval;
388
389 tval = bq27x00_read(di, reg, false);
390 if (tval < 0) {
391 dev_err(di->dev, "error reading power avg rgister %02x: %d\n",
392 reg, tval);
393 return tval;
394 }
395
396 if (di->chip == BQ27500)
397 return tval;
398 else
399 return (tval * BQ27x00_POWER_CONSTANT) / BQ27000_RS;
400}
401
402/*
403 * Read flag register.
404 * Return < 0 if something fails.
405 */
406static int bq27x00_battery_read_health(struct bq27x00_device_info *di)
407{
408 int tval;
409
410 tval = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
411 if (tval < 0) {
412 dev_err(di->dev, "error reading flag register:%d\n", tval);
413 return tval;
414 }
415
416 if ((di->chip == BQ27500)) {
417 if (tval & BQ27500_FLAG_SOCF)
418 tval = POWER_SUPPLY_HEALTH_DEAD;
419 else if (tval & BQ27500_FLAG_OTC)
420 tval = POWER_SUPPLY_HEALTH_OVERHEAT;
421 else
422 tval = POWER_SUPPLY_HEALTH_GOOD;
423 return tval;
424 } else {
425 if (tval & BQ27000_FLAG_EDV1)
426 tval = POWER_SUPPLY_HEALTH_DEAD;
427 else
428 tval = POWER_SUPPLY_HEALTH_GOOD;
429 return tval;
430 }
431
432 return -1;
433}
434
297a533b
LPC		 435static void bq27x00_update(struct bq27x00_device_info *di)
436{
437 struct bq27x00_reg_cache cache = {0, };
438 bool is_bq27500 = di->chip == BQ27500;
a66f59ba 439 bool is_bq27425 = di->chip == BQ27425;
628ef02c 440 bool is_bq27742 = di->chip == BQ27742;
a3c0c3e7 441 bool flags_1b = !(is_bq27500 || is_bq27742);
297a533b 442
a3c0c3e7 443 cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, flags_1b);
3dd843e1
MB		 444 if ((cache.flags & 0xff) == 0xff)
445 /* read error */
446 cache.flags = -1;
297a533b 447 if (cache.flags >= 0) {
a3c0c3e7 448 if (!is_bq27500 && !is_bq27425 && !is_bq27742
a66f59ba 449 && (cache.flags & BQ27000_FLAG_CI)) {
c6cd4f26 450 dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
4b226c2c 451 cache.capacity = -ENODATA;
a8f6bd23 452 cache.energy = -ENODATA;
4b226c2c
PR		 453 cache.time_to_empty = -ENODATA;
454 cache.time_to_empty_avg = -ENODATA;
455 cache.time_to_full = -ENODATA;
456 cache.charge_full = -ENODATA;
9903e627 457 cache.health = -ENODATA;
4b226c2c
PR		 458 } else {
459 cache.capacity = bq27x00_battery_read_rsoc(di);
628ef02c
PV		 460 if (is_bq27742)
461 cache.time_to_empty =
462 bq27x00_battery_read_time(di,
463 BQ27x00_REG_TTE);
464 else if (!is_bq27425) {
a66f59ba
SG		 465 cache.energy = bq27x00_battery_read_energy(di);
466 cache.time_to_empty =
467 bq27x00_battery_read_time(di,
468 BQ27x00_REG_TTE);
469 cache.time_to_empty_avg =
470 bq27x00_battery_read_time(di,
471 BQ27x00_REG_TTECP);
472 cache.time_to_full =
473 bq27x00_battery_read_time(di,
474 BQ27x00_REG_TTF);
475 }
a3c0c3e7 476 cache.charge_full = bq27x00_battery_read_lmd(di);
9903e627 477 cache.health = bq27x00_battery_read_health(di);
4b226c2c 478 }
d149e98e 479 cache.temperature = bq27x00_battery_read_temperature(di);
a66f59ba
SG		 480 if (!is_bq27425)
481 cache.cycle_count = bq27x00_battery_read_cyct(di);
628ef02c
PV		 482 if (is_bq27742)
483 cache.power_avg =
484 bq27x00_battery_read_pwr_avg(di,
485 BQ27742_POWER_AVG);
486 else
487 cache.power_avg =
488 bq27x00_battery_read_pwr_avg(di,
489 BQ27x00_POWER_AVG);
297a533b 490
631c17ee
PR		 491 /* We only have to read charge design full once */
492 if (di->charge_design_full <= 0)
493 di->charge_design_full = bq27x00_battery_read_ilmd(di);
297a533b
LPC		 494 }
495
b68f6216 496 if (memcmp(&di->cache, &cache, sizeof(cache)) != 0) {
297a533b
LPC		 497 di->cache = cache;
498 power_supply_changed(&di->bat);
499 }
500
501 di->last_update = jiffies;
502}
503
740b755a
LPC		 504static void bq27x00_battery_poll(struct work_struct *work)
505{
506 struct bq27x00_device_info *di =
507 container_of(work, struct bq27x00_device_info, work.work);
508
509 bq27x00_update(di);
510
511 if (poll_interval > 0) {
512 /* The timer does not have to be accurate. */
513 set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
514 schedule_delayed_work(&di->work, poll_interval * HZ);
515 }
516}
517
b996ad0e 518/*
bf7d4140 519 * Return the battery average current in µA
b996ad0e
RG		 520 * Note that current can be negative signed as well
521 * Or 0 if something fails.
522 */
297a533b
LPC		 523static int bq27x00_battery_current(struct bq27x00_device_info *di,
524 union power_supply_propval *val)
b996ad0e 525{
297a533b 526 int curr;
b68f6216 527 int flags;
b996ad0e 528
b68f6216 529 curr = bq27x00_read(di, BQ27x00_REG_AI, false);
c6cd4f26
PR		 530 if (curr < 0) {
531 dev_err(di->dev, "error reading current\n");
297a533b 532 return curr;
c6cd4f26 533 }
e20908d9 534
a66f59ba 535 if (bq27xxx_is_chip_version_higher(di)) {
e20908d9 536 /* bq27500 returns signed value */
297a533b 537 val->intval = (int)((s16)curr) * 1000;
e20908d9 538 } else {
b68f6216
PR		 539 flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
540 if (flags & BQ27000_FLAG_CHGS) {
e20908d9 541 dev_dbg(di->dev, "negative current!\n");
afbc74fd 542 curr = -curr;
e20908d9 543 }
b996ad0e 544
297a533b 545 val->intval = curr * 3570 / BQ27000_RS;
b996ad0e
RG		 546 }
547
297a533b 548 return 0;
b996ad0e
RG		 549}
550
4e924a81 551static int bq27x00_battery_status(struct bq27x00_device_info *di,
297a533b 552 union power_supply_propval *val)
4e924a81 553{
4e924a81 554 int status;
4e924a81 555
a66f59ba 556 if (bq27xxx_is_chip_version_higher(di)) {
297a533b 557 if (di->cache.flags & BQ27500_FLAG_FC)
4e924a81 558 status = POWER_SUPPLY_STATUS_FULL;
b7aaacf5 559 else if (di->cache.flags & BQ27500_FLAG_DSC)
4e924a81 560 status = POWER_SUPPLY_STATUS_DISCHARGING;
270968c0 561 else
b7aaacf5 562 status = POWER_SUPPLY_STATUS_CHARGING;
4e924a81 563 } else {
c1b9ab67
LPC		 564 if (di->cache.flags & BQ27000_FLAG_FC)
565 status = POWER_SUPPLY_STATUS_FULL;
566 else if (di->cache.flags & BQ27000_FLAG_CHGS)
4e924a81 567 status = POWER_SUPPLY_STATUS_CHARGING;
c1b9ab67
LPC		 568 else if (power_supply_am_i_supplied(&di->bat))
569 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
4e924a81
GI		 570 else
571 status = POWER_SUPPLY_STATUS_DISCHARGING;
572 }
573
574 val->intval = status;
297a533b 575
4e924a81
GI		 576 return 0;
577}
578
d66bab3f
PR		 579static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di,
580 union power_supply_propval *val)
581{
582 int level;
583
a66f59ba 584 if (bq27xxx_is_chip_version_higher(di)) {
d66bab3f
PR		 585 if (di->cache.flags & BQ27500_FLAG_FC)
586 level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
587 else if (di->cache.flags & BQ27500_FLAG_SOC1)
588 level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
589 else if (di->cache.flags & BQ27500_FLAG_SOCF)
590 level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
591 else
592 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
593 } else {
594 if (di->cache.flags & BQ27000_FLAG_FC)
595 level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
596 else if (di->cache.flags & BQ27000_FLAG_EDV1)
597 level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
598 else if (di->cache.flags & BQ27000_FLAG_EDVF)
599 level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
600 else
601 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
602 }
603
604 val->intval = level;
605
606 return 0;
607}
608
4e924a81 609/*
91fe4d50 610 * Return the battery Voltage in millivolts
297a533b 611 * Or < 0 if something fails.
4e924a81 612 */
297a533b
LPC		 613static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
614 union power_supply_propval *val)
4e924a81 615{
297a533b 616 int volt;
4e924a81 617
297a533b 618 volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
c6cd4f26
PR		 619 if (volt < 0) {
620 dev_err(di->dev, "error reading voltage\n");
297a533b 621 return volt;
c6cd4f26 622 }
4e924a81 623
297a533b
LPC		 624 val->intval = volt * 1000;
625
626 return 0;
627}
628
629static int bq27x00_simple_value(int value,
630 union power_supply_propval *val)
631{
632 if (value < 0)
633 return value;
634
635 val->intval = value;
4e924a81 636
4e924a81
GI		 637 return 0;
638}
639
b996ad0e
RG		 640#define to_bq27x00_device_info(x) container_of((x), \
641 struct bq27x00_device_info, bat);
642
643static int bq27x00_battery_get_property(struct power_supply *psy,
644 enum power_supply_property psp,
645 union power_supply_propval *val)
646{
4e924a81 647 int ret = 0;
b996ad0e 648 struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
3413b4ea 649
740b755a
LPC		 650 mutex_lock(&di->lock);
651 if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
652 cancel_delayed_work_sync(&di->work);
653 bq27x00_battery_poll(&di->work.work);
654 }
655 mutex_unlock(&di->lock);
297a533b
LPC		 656
657 if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
3413b4ea 658 return -ENODEV;
b996ad0e
RG		 659
660 switch (psp) {
4e924a81
GI		 661 case POWER_SUPPLY_PROP_STATUS:
662 ret = bq27x00_battery_status(di, val);
663 break;
b996ad0e 664 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
297a533b 665 ret = bq27x00_battery_voltage(di, val);
3413b4ea 666 break;
b996ad0e 667 case POWER_SUPPLY_PROP_PRESENT:
297a533b 668 val->intval = di->cache.flags < 0 ? 0 : 1;
b996ad0e
RG		 669 break;
670 case POWER_SUPPLY_PROP_CURRENT_NOW:
297a533b 671 ret = bq27x00_battery_current(di, val);
b996ad0e
RG		 672 break;
673 case POWER_SUPPLY_PROP_CAPACITY:
297a533b 674 ret = bq27x00_simple_value(di->cache.capacity, val);
b996ad0e 675 break;
d66bab3f
PR		 676 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
677 ret = bq27x00_battery_capacity_level(di, val);
678 break;
b996ad0e 679 case POWER_SUPPLY_PROP_TEMP:
d149e98e 680 ret = bq27x00_simple_value(di->cache.temperature, val);
5dc3443e
PR		 681 if (ret == 0)
682 val->intval -= 2731;
b996ad0e 683 break;
4e924a81 684 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
297a533b 685 ret = bq27x00_simple_value(di->cache.time_to_empty, val);
4e924a81
GI		 686 break;
687 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
297a533b 688 ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val);
4e924a81
GI		 689 break;
690 case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
297a533b 691 ret = bq27x00_simple_value(di->cache.time_to_full, val);
4e924a81 692 break;
5661f334
LPC		 693 case POWER_SUPPLY_PROP_TECHNOLOGY:
694 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
695 break;
631c17ee
PR		 696 case POWER_SUPPLY_PROP_CHARGE_NOW:
697 ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
698 break;
699 case POWER_SUPPLY_PROP_CHARGE_FULL:
700 ret = bq27x00_simple_value(di->cache.charge_full, val);
701 break;
702 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
703 ret = bq27x00_simple_value(di->charge_design_full, val);
704 break;
73c244a8
PR		 705 case POWER_SUPPLY_PROP_CYCLE_COUNT:
706 ret = bq27x00_simple_value(di->cache.cycle_count, val);
631c17ee
PR		 707 break;
708 case POWER_SUPPLY_PROP_ENERGY_NOW:
a8f6bd23 709 ret = bq27x00_simple_value(di->cache.energy, val);
631c17ee 710 break;
9903e627
SR		 711 case POWER_SUPPLY_PROP_POWER_AVG:
712 ret = bq27x00_simple_value(di->cache.power_avg, val);
713 break;
714 case POWER_SUPPLY_PROP_HEALTH:
715 ret = bq27x00_simple_value(di->cache.health, val);
716 break;
b996ad0e
RG		 717 default:
718 return -EINVAL;
719 }
720
4e924a81 721 return ret;
b996ad0e
RG		 722}
723
740b755a
LPC		 724static void bq27x00_external_power_changed(struct power_supply *psy)
725{
726 struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
727
728 cancel_delayed_work_sync(&di->work);
729 schedule_delayed_work(&di->work, 0);
730}
731
a40402ef 732static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
b996ad0e 733{
a40402ef
LPC		 734 int ret;
735
b996ad0e 736 di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
a66f59ba
SG		 737 if (di->chip == BQ27425) {
738 di->bat.properties = bq27425_battery_props;
739 di->bat.num_properties = ARRAY_SIZE(bq27425_battery_props);
628ef02c
PV		 740 } else if (di->chip == BQ27742) {
741 di->bat.properties = bq27742_battery_props;
742 di->bat.num_properties = ARRAY_SIZE(bq27742_battery_props);
a66f59ba
SG		 743 } else {
744 di->bat.properties = bq27x00_battery_props;
745 di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
746 }
b996ad0e 747 di->bat.get_property = bq27x00_battery_get_property;
740b755a
LPC		 748 di->bat.external_power_changed = bq27x00_external_power_changed;
749
750 INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
751 mutex_init(&di->lock);
a40402ef
LPC		 752
753 ret = power_supply_register(di->dev, &di->bat);
754 if (ret) {
755 dev_err(di->dev, "failed to register battery: %d\n", ret);
756 return ret;
757 }
758
759 dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
760
297a533b
LPC		 761 bq27x00_update(di);
762
a40402ef 763 return 0;
b996ad0e
RG		 764}
765
740b755a
LPC		 766static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
767{
8cfaaa81
PR		 768 /*
769 * power_supply_unregister call bq27x00_battery_get_property which
770 * call bq27x00_battery_poll.
771 * Make sure that bq27x00_battery_poll will not call
772 * schedule_delayed_work again after unregister (which cause OOPS).
773 */
774 poll_interval = 0;
775
740b755a
LPC		 776 cancel_delayed_work_sync(&di->work);
777
778 power_supply_unregister(&di->bat);
779
780 mutex_destroy(&di->lock);
781}
782
7fb7ba58
LPC		 783
784/* i2c specific code */
785#ifdef CONFIG_BATTERY_BQ27X00_I2C
786
787/* If the system has several batteries we need a different name for each
788 * of them...
b996ad0e 789 */
7fb7ba58
LPC		 790static DEFINE_IDR(battery_id);
791static DEFINE_MUTEX(battery_mutex);
b996ad0e 792
297a533b 793static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
b996ad0e 794{
a40402ef 795 struct i2c_client *client = to_i2c_client(di->dev);
9e912f45 796 struct i2c_msg msg[2];
b996ad0e 797 unsigned char data[2];
297a533b 798 int ret;
b996ad0e
RG		 799
800 if (!client->adapter)
801 return -ENODEV;
802
9e912f45
GI		 803 msg[0].addr = client->addr;
804 msg[0].flags = 0;
805 msg[0].buf = &reg;
806 msg[0].len = sizeof(reg);
807 msg[1].addr = client->addr;
808 msg[1].flags = I2C_M_RD;
809 msg[1].buf = data;
2ec523a8 810 if (single)
9e912f45 811 msg[1].len = 1;
2ec523a8 812 else
9e912f45 813 msg[1].len = 2;
2ec523a8 814
9e912f45 815 ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
2ec523a8
LPC		 816 if (ret < 0)
817 return ret;
818
819 if (!single)
820 ret = get_unaligned_le16(data);
821 else
822 ret = data[0];
b996ad0e 823
297a533b 824 return ret;
b996ad0e
RG		 825}
826
e20908d9 827static int bq27x00_battery_probe(struct i2c_client *client,
b996ad0e
RG		 828 const struct i2c_device_id *id)
829{
830 char *name;
831 struct bq27x00_device_info *di;
b996ad0e
RG		 832 int num;
833 int retval = 0;
834
835 /* Get new ID for the new battery device */
b996ad0e 836 mutex_lock(&battery_mutex);
05e2cefa 837 num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
b996ad0e 838 mutex_unlock(&battery_mutex);
05e2cefa
TH		 839 if (num < 0)
840 return num;
b996ad0e 841
e20908d9 842 name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
b996ad0e
RG		 843 if (!name) {
844 dev_err(&client->dev, "failed to allocate device name\n");
845 retval = -ENOMEM;
846 goto batt_failed_1;
847 }
848
1cb82fdb 849 di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
b996ad0e
RG		 850 if (!di) {
851 dev_err(&client->dev, "failed to allocate device info data\n");
852 retval = -ENOMEM;
853 goto batt_failed_2;
854 }
a40402ef 855
b996ad0e 856 di->id = num;
a40402ef 857 di->dev = &client->dev;
e20908d9 858 di->chip = id->driver_data;
a40402ef
LPC		 859 di->bat.name = name;
860 di->bus.read = &bq27x00_read_i2c;
b996ad0e 861
f7760995
JL		 862 retval = bq27x00_powersupply_init(di);
863 if (retval)
1cb82fdb 864 goto batt_failed_2;
b996ad0e
RG		 865
866 i2c_set_clientdata(client, di);
b996ad0e
RG		 867
868 return 0;
869
b996ad0e
RG		 870batt_failed_2:
871 kfree(name);
872batt_failed_1:
873 mutex_lock(&battery_mutex);
874 idr_remove(&battery_id, num);
875 mutex_unlock(&battery_mutex);
876
877 return retval;
878}
879
e20908d9 880static int bq27x00_battery_remove(struct i2c_client *client)
b996ad0e
RG		 881{
882 struct bq27x00_device_info *di = i2c_get_clientdata(client);
883
740b755a 884 bq27x00_powersupply_unregister(di);
b996ad0e
RG		 885
886 kfree(di->bat.name);
887
888 mutex_lock(&battery_mutex);
889 idr_remove(&battery_id, di->id);
890 mutex_unlock(&battery_mutex);
891
b996ad0e
RG		 892 return 0;
893}
894
e20908d9
GI		 895static const struct i2c_device_id bq27x00_id[] = {
896 { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
897 { "bq27500", BQ27500 },
a66f59ba 898 { "bq27425", BQ27425 },
628ef02c 899 { "bq27742", BQ27742 },
b996ad0e
RG		 900 {},
901};
fd9b958c 902MODULE_DEVICE_TABLE(i2c, bq27x00_id);
b996ad0e 903
e20908d9 904static struct i2c_driver bq27x00_battery_driver = {
b996ad0e 905 .driver = {
e20908d9 906 .name = "bq27x00-battery",
b996ad0e 907 },
e20908d9
GI		 908 .probe = bq27x00_battery_probe,
909 .remove = bq27x00_battery_remove,
910 .id_table = bq27x00_id,
b996ad0e
RG		 911};
912
7fb7ba58
LPC		 913static inline int bq27x00_battery_i2c_init(void)
914{
915 int ret = i2c_add_driver(&bq27x00_battery_driver);
916 if (ret)
917 printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n");
918
919 return ret;
920}
921
922static inline void bq27x00_battery_i2c_exit(void)
923{
924 i2c_del_driver(&bq27x00_battery_driver);
925}
926
927#else
928
929static inline int bq27x00_battery_i2c_init(void) { return 0; }
930static inline void bq27x00_battery_i2c_exit(void) {};
931
932#endif
933
934/* platform specific code */
935#ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
936
937static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
297a533b 938 bool single)
7fb7ba58
LPC		 939{
940 struct device *dev = di->dev;
941 struct bq27000_platform_data *pdata = dev->platform_data;
942 unsigned int timeout = 3;
943 int upper, lower;
944 int temp;
945
946 if (!single) {
947 /* Make sure the value has not changed in between reading the
948 * lower and the upper part */
949 upper = pdata->read(dev, reg + 1);
950 do {
951 temp = upper;
952 if (upper < 0)
953 return upper;
954
955 lower = pdata->read(dev, reg);
956 if (lower < 0)
957 return lower;
958
959 upper = pdata->read(dev, reg + 1);
960 } while (temp != upper && --timeout);
961
962 if (timeout == 0)
963 return -EIO;
964
297a533b 965 return (upper << 8) | lower;
7fb7ba58 966 }
297a533b
LPC		 967
968 return pdata->read(dev, reg);
7fb7ba58
LPC		 969}
970
c8afa640 971static int bq27000_battery_probe(struct platform_device *pdev)
7fb7ba58
LPC		 972{
973 struct bq27x00_device_info *di;
974 struct bq27000_platform_data *pdata = pdev->dev.platform_data;
7fb7ba58
LPC		 975
976 if (!pdata) {
977 dev_err(&pdev->dev, "no platform_data supplied\n");
978 return -EINVAL;
979 }
980
981 if (!pdata->read) {
982 dev_err(&pdev->dev, "no hdq read callback supplied\n");
983 return -EINVAL;
984 }
985
1cb82fdb 986 di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
7fb7ba58
LPC		 987 if (!di) {
988 dev_err(&pdev->dev, "failed to allocate device info data\n");
989 return -ENOMEM;
990 }
991
992 platform_set_drvdata(pdev, di);
993
994 di->dev = &pdev->dev;
995 di->chip = BQ27000;
996
997 di->bat.name = pdata->name ?: dev_name(&pdev->dev);
998 di->bus.read = &bq27000_read_platform;
999
1cb82fdb 1000 return bq27x00_powersupply_init(di);
7fb7ba58
LPC		 1001}
1002
415ec69f 1003static int bq27000_battery_remove(struct platform_device *pdev)
7fb7ba58
LPC		 1004{
1005 struct bq27x00_device_info *di = platform_get_drvdata(pdev);
1006
740b755a
LPC		 1007 bq27x00_powersupply_unregister(di);
1008
7fb7ba58
LPC		 1009 return 0;
1010}
1011
1012static struct platform_driver bq27000_battery_driver = {
1013 .probe = bq27000_battery_probe,
28ea73f4 1014 .remove = bq27000_battery_remove,
7fb7ba58
LPC		 1015 .driver = {
1016 .name = "bq27000-battery",
1017 .owner = THIS_MODULE,
1018 },
1019};
1020
1021static inline int bq27x00_battery_platform_init(void)
1022{
1023 int ret = platform_driver_register(&bq27000_battery_driver);
1024 if (ret)
1025 printk(KERN_ERR "Unable to register BQ27000 platform driver\n");
1026
1027 return ret;
1028}
1029
1030static inline void bq27x00_battery_platform_exit(void)
1031{
1032 platform_driver_unregister(&bq27000_battery_driver);
1033}
1034
1035#else
1036
1037static inline int bq27x00_battery_platform_init(void) { return 0; }
1038static inline void bq27x00_battery_platform_exit(void) {};
1039
1040#endif
1041
1042/*
1043 * Module stuff
1044 */
1045
b996ad0e
RG		 1046static int __init bq27x00_battery_init(void)
1047{
1048 int ret;
1049
7fb7ba58
LPC		 1050 ret = bq27x00_battery_i2c_init();
1051 if (ret)
1052 return ret;
1053
1054 ret = bq27x00_battery_platform_init();
b996ad0e 1055 if (ret)
7fb7ba58 1056 bq27x00_battery_i2c_exit();
b996ad0e
RG		 1057
1058 return ret;
1059}
1060module_init(bq27x00_battery_init);
1061
1062static void __exit bq27x00_battery_exit(void)
1063{
7fb7ba58
LPC		 1064 bq27x00_battery_platform_exit();
1065 bq27x00_battery_i2c_exit();
b996ad0e
RG		 1066}
1067module_exit(bq27x00_battery_exit);
1068
1069MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1070MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
1071MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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