projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
power: bq27xxx_battery: Add support for additional bq27xxx family devices
[linux-2.6-block.git] / drivers / power / bq27xxx_battery.c
CommitLineData
b996ad0e 1/*
081bab21 2 * BQ27xxx battery driver
b996ad0e
RG		 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 *
631c17ee 19 * Datasheets:
d74534c2
AD		 20 * http://www.ti.com/product/bq27000
21 * http://www.ti.com/product/bq27200
22 * http://www.ti.com/product/bq27010
23 * http://www.ti.com/product/bq27210
24 * http://www.ti.com/product/bq27500
25 * http://www.ti.com/product/bq27510-g3
26 * http://www.ti.com/product/bq27520-g4
27 * http://www.ti.com/product/bq27530-g1
28 * http://www.ti.com/product/bq27531-g1
29 * http://www.ti.com/product/bq27541-g1
30 * http://www.ti.com/product/bq27542-g1
31 * http://www.ti.com/product/bq27546-g1
32 * http://www.ti.com/product/bq27742-g1
33 * http://www.ti.com/product/bq27545-g1
34 * http://www.ti.com/product/bq27421-g1
a66f59ba 35 * http://www.ti.com/product/bq27425-g1
d74534c2
AD		 36 * http://www.ti.com/product/bq27411-g1
37 * http://www.ti.com/product/bq27621-g1
631c17ee
PR		 38 */
39
1cb82fdb 40#include <linux/device.h>
b996ad0e
RG		 41#include <linux/module.h>
42#include <linux/param.h>
43#include <linux/jiffies.h>
44#include <linux/workqueue.h>
45#include <linux/delay.h>
46#include <linux/platform_device.h>
47#include <linux/power_supply.h>
48#include <linux/idr.h>
b996ad0e 49#include <linux/i2c.h>
5a0e3ad6 50#include <linux/slab.h>
8aef7e8f 51#include <asm/unaligned.h>
b996ad0e 52
081bab21 53#include <linux/power/bq27xxx_battery.h>
7fb7ba58 54
6eb207f2 55#define DRIVER_VERSION "1.2.0"
b996ad0e 56
db04fc5c
AD		 57#define BQ27XXX_MANUFACTURER "Texas Instruments"
58
d74534c2
AD		 59/* BQ27XXX Flags */
60#define BQ27XXX_FLAG_DSC BIT(0)
61#define BQ27XXX_FLAG_SOCF BIT(1) /* State-of-Charge threshold final */
62#define BQ27XXX_FLAG_SOC1 BIT(2) /* State-of-Charge threshold 1 */
63#define BQ27XXX_FLAG_FC BIT(9)
64#define BQ27XXX_FLAG_OTD BIT(14)
65#define BQ27XXX_FLAG_OTC BIT(15)
66
67/* BQ27000 has different layout for Flags register */
6eb207f2
AD		 68#define BQ27000_FLAG_EDVF BIT(0) /* Final End-of-Discharge-Voltage flag */
69#define BQ27000_FLAG_EDV1 BIT(1) /* First End-of-Discharge-Voltage flag */
70#define BQ27000_FLAG_CI BIT(4) /* Capacity Inaccurate flag */
71#define BQ27000_FLAG_FC BIT(5)
72#define BQ27000_FLAG_CHGS BIT(7) /* Charge state flag */
73
d74534c2
AD		 74#define BQ27XXX_RS (20) /* Resistor sense mOhm */
75#define BQ27XXX_POWER_CONSTANT (29200) /* 29.2 µV^2 * 1000 */
76#define BQ27XXX_CURRENT_CONSTANT (3570) /* 3.57 µV * 1000 */
a2e5118c 77
081bab21
AD		 78struct bq27xxx_device_info;
79struct bq27xxx_access_methods {
80 int (*read)(struct bq27xxx_device_info *di, u8 reg, bool single);
b996ad0e
RG		 81};
82
d74534c2
AD		 83#define INVALID_REG_ADDR 0xff
84
85/*
86 * bq27xxx_reg_index - Register names
87 *
88 * These are indexes into a device's register mapping array.
89 */
90enum bq27xxx_reg_index {
91 BQ27XXX_REG_CTRL = 0, /* Control */
92 BQ27XXX_REG_TEMP, /* Temperature */
93 BQ27XXX_REG_INT_TEMP, /* Internal Temperature */
94 BQ27XXX_REG_VOLT, /* Voltage */
95 BQ27XXX_REG_AI, /* Average Current */
96 BQ27XXX_REG_FLAGS, /* Flags */
97 BQ27XXX_REG_TTE, /* Time-to-Empty */
98 BQ27XXX_REG_TTF, /* Time-to-Full */
99 BQ27XXX_REG_TTES, /* Time-to-Empty Standby */
100 BQ27XXX_REG_TTECP, /* Time-to-Empty at Constant Power */
101 BQ27XXX_REG_NAC, /* Nominal Available Capacity */
102 BQ27XXX_REG_FCC, /* Full Charge Capacity */
103 BQ27XXX_REG_CYCT, /* Cycle Count */
104 BQ27XXX_REG_AE, /* Available Energy */
105 BQ27XXX_REG_SOC, /* State-of-Charge */
106 BQ27XXX_REG_DCAP, /* Design Capacity */
107 BQ27XXX_REG_AP, /* Average Power */
108};
109
081bab21 110struct bq27xxx_reg_cache {
297a533b
LPC		 111 int temperature;
112 int time_to_empty;
113 int time_to_empty_avg;
114 int time_to_full;
631c17ee 115 int charge_full;
73c244a8 116 int cycle_count;
297a533b 117 int capacity;
a8f6bd23 118 int energy;
297a533b 119 int flags;
9903e627
SR		 120 int power_avg;
121 int health;
297a533b
LPC		 122};
123
081bab21 124struct bq27xxx_device_info {
6d0a1815 125 struct device *dev;
b996ad0e 126 int id;
081bab21 127 enum bq27xxx_chip chip;
b996ad0e 128
081bab21 129 struct bq27xxx_reg_cache cache;
631c17ee
PR		 130 int charge_design_full;
131
297a533b 132 unsigned long last_update;
740b755a 133 struct delayed_work work;
297a533b 134
297d716f 135 struct power_supply *bat;
a40402ef 136
081bab21 137 struct bq27xxx_access_methods bus;
740b755a
LPC		 138
139 struct mutex lock;
d74534c2
AD		 140
141 u8 *regs;
142};
143
144/* Register mappings */
145static u8 bq27000_regs[] = {
146 0x00, /* CONTROL */
147 0x06, /* TEMP */
148 INVALID_REG_ADDR, /* INT TEMP - NA*/
149 0x08, /* VOLT */
150 0x14, /* AVG CURR */
151 0x0a, /* FLAGS */
152 0x16, /* TTE */
153 0x18, /* TTF */
154 0x1c, /* TTES */
155 0x26, /* TTECP */
156 0x0c, /* NAC */
157 0x12, /* LMD(FCC) */
158 0x2a, /* CYCT */
159 0x22, /* AE */
160 0x0b, /* SOC(RSOC) */
161 0x76, /* DCAP(ILMD) */
162 0x24, /* AP */
163};
164
165static u8 bq27010_regs[] = {
166 0x00, /* CONTROL */
167 0x06, /* TEMP */
168 INVALID_REG_ADDR, /* INT TEMP - NA*/
169 0x08, /* VOLT */
170 0x14, /* AVG CURR */
171 0x0a, /* FLAGS */
172 0x16, /* TTE */
173 0x18, /* TTF */
174 0x1c, /* TTES */
175 0x26, /* TTECP */
176 0x0c, /* NAC */
177 0x12, /* LMD(FCC) */
178 0x2a, /* CYCT */
179 INVALID_REG_ADDR, /* AE - NA */
180 0x0b, /* SOC(RSOC) */
181 0x76, /* DCAP(ILMD) */
182 INVALID_REG_ADDR, /* AP - NA */
183};
184
185static u8 bq27500_regs[] = {
186 0x00, /* CONTROL */
187 0x06, /* TEMP */
188 0x28, /* INT TEMP */
189 0x08, /* VOLT */
190 0x14, /* AVG CURR */
191 0x0a, /* FLAGS */
192 0x16, /* TTE */
193 INVALID_REG_ADDR, /* TTF - NA */
194 0x1a, /* TTES */
195 INVALID_REG_ADDR, /* TTECP - NA */
196 0x0c, /* NAC */
197 0x12, /* LMD(FCC) */
198 0x1e, /* CYCT */
199 INVALID_REG_ADDR, /* AE - NA */
200 0x20, /* SOC(RSOC) */
201 0x2e, /* DCAP(ILMD) */
202 INVALID_REG_ADDR, /* AP - NA */
b996ad0e
RG		 203};
204
d74534c2
AD		 205static u8 bq27530_regs[] = {
206 0x00, /* CONTROL */
207 0x06, /* TEMP */
208 0x32, /* INT TEMP */
209 0x08, /* VOLT */
210 0x14, /* AVG CURR */
211 0x0a, /* FLAGS */
212 0x16, /* TTE */
213 INVALID_REG_ADDR, /* TTF - NA */
214 INVALID_REG_ADDR, /* TTES - NA */
215 INVALID_REG_ADDR, /* TTECP - NA */
216 0x0c, /* NAC */
217 0x12, /* LMD(FCC) */
218 0x2a, /* CYCT */
219 INVALID_REG_ADDR, /* AE - NA */
220 0x2c, /* SOC(RSOC) */
221 INVALID_REG_ADDR, /* DCAP - NA */
222 0x24, /* AP */
223};
224
225static u8 bq27541_regs[] = {
226 0x00, /* CONTROL */
227 0x06, /* TEMP */
228 0x28, /* INT TEMP */
229 0x08, /* VOLT */
230 0x14, /* AVG CURR */
231 0x0a, /* FLAGS */
232 0x16, /* TTE */
233 INVALID_REG_ADDR, /* TTF - NA */
234 INVALID_REG_ADDR, /* TTES - NA */
235 INVALID_REG_ADDR, /* TTECP - NA */
236 0x0c, /* NAC */
237 0x12, /* LMD(FCC) */
238 0x2a, /* CYCT */
239 INVALID_REG_ADDR, /* AE - NA */
240 0x2c, /* SOC(RSOC) */
241 0x3c, /* DCAP */
242 0x76, /* AP */
243};
244
245static u8 bq27545_regs[] = {
246 0x00, /* CONTROL */
247 0x06, /* TEMP */
248 0x28, /* INT TEMP */
249 0x08, /* VOLT */
250 0x14, /* AVG CURR */
251 0x0a, /* FLAGS */
252 0x16, /* TTE */
253 INVALID_REG_ADDR, /* TTF - NA */
254 INVALID_REG_ADDR, /* TTES - NA */
255 INVALID_REG_ADDR, /* TTECP - NA */
256 0x0c, /* NAC */
257 0x12, /* LMD(FCC) */
258 0x2a, /* CYCT */
259 INVALID_REG_ADDR, /* AE - NA */
260 0x2c, /* SOC(RSOC) */
261 INVALID_REG_ADDR, /* DCAP - NA */
262 0x24, /* AP */
263};
264
265static u8 bq27421_regs[] = {
266 0x00, /* CONTROL */
267 0x02, /* TEMP */
268 0x1e, /* INT TEMP */
269 0x04, /* VOLT */
270 0x10, /* AVG CURR */
271 0x06, /* FLAGS */
272 INVALID_REG_ADDR, /* TTE - NA */
273 INVALID_REG_ADDR, /* TTF - NA */
274 INVALID_REG_ADDR, /* TTES - NA */
275 INVALID_REG_ADDR, /* TTECP - NA */
276 0x08, /* NAC */
277 0x0e, /* FCC */
278 INVALID_REG_ADDR, /* CYCT - NA */
279 INVALID_REG_ADDR, /* AE - NA */
280 0x1c, /* SOC */
281 0x3c, /* DCAP */
282 0x18, /* AP */
283};
284
285static u8 *bq27xxx_regs[] = {
286 [BQ27000] = bq27000_regs,
287 [BQ27010] = bq27010_regs,
288 [BQ27500] = bq27500_regs,
289 [BQ27530] = bq27530_regs,
290 [BQ27541] = bq27541_regs,
291 [BQ27545] = bq27545_regs,
292 [BQ27421] = bq27421_regs,
293};
294
295static enum power_supply_property bq27000_battery_props[] = {
4e924a81 296 POWER_SUPPLY_PROP_STATUS,
b996ad0e
RG		 297 POWER_SUPPLY_PROP_PRESENT,
298 POWER_SUPPLY_PROP_VOLTAGE_NOW,
299 POWER_SUPPLY_PROP_CURRENT_NOW,
300 POWER_SUPPLY_PROP_CAPACITY,
d66bab3f 301 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
b996ad0e 302 POWER_SUPPLY_PROP_TEMP,
4e924a81
GI		 303 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
304 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
305 POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
5661f334 306 POWER_SUPPLY_PROP_TECHNOLOGY,
631c17ee
PR		 307 POWER_SUPPLY_PROP_CHARGE_FULL,
308 POWER_SUPPLY_PROP_CHARGE_NOW,
309 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
73c244a8 310 POWER_SUPPLY_PROP_CYCLE_COUNT,
631c17ee 311 POWER_SUPPLY_PROP_ENERGY_NOW,
9903e627
SR		 312 POWER_SUPPLY_PROP_POWER_AVG,
313 POWER_SUPPLY_PROP_HEALTH,
db04fc5c 314 POWER_SUPPLY_PROP_MANUFACTURER,
b996ad0e
RG		 315};
316
d74534c2 317static enum power_supply_property bq27010_battery_props[] = {
a66f59ba
SG		 318 POWER_SUPPLY_PROP_STATUS,
319 POWER_SUPPLY_PROP_PRESENT,
320 POWER_SUPPLY_PROP_VOLTAGE_NOW,
321 POWER_SUPPLY_PROP_CURRENT_NOW,
322 POWER_SUPPLY_PROP_CAPACITY,
323 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
324 POWER_SUPPLY_PROP_TEMP,
d74534c2
AD		 325 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
326 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
327 POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
a66f59ba
SG		 328 POWER_SUPPLY_PROP_TECHNOLOGY,
329 POWER_SUPPLY_PROP_CHARGE_FULL,
330 POWER_SUPPLY_PROP_CHARGE_NOW,
331 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
d74534c2
AD		 332 POWER_SUPPLY_PROP_CYCLE_COUNT,
333 POWER_SUPPLY_PROP_HEALTH,
db04fc5c 334 POWER_SUPPLY_PROP_MANUFACTURER,
a66f59ba
SG		 335};
336
d74534c2 337static enum power_supply_property bq27500_battery_props[] = {
628ef02c
PV		 338 POWER_SUPPLY_PROP_STATUS,
339 POWER_SUPPLY_PROP_PRESENT,
340 POWER_SUPPLY_PROP_VOLTAGE_NOW,
341 POWER_SUPPLY_PROP_CURRENT_NOW,
342 POWER_SUPPLY_PROP_CAPACITY,
343 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
344 POWER_SUPPLY_PROP_TEMP,
345 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
346 POWER_SUPPLY_PROP_TECHNOLOGY,
347 POWER_SUPPLY_PROP_CHARGE_FULL,
348 POWER_SUPPLY_PROP_CHARGE_NOW,
349 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
350 POWER_SUPPLY_PROP_CYCLE_COUNT,
d74534c2
AD		 351 POWER_SUPPLY_PROP_HEALTH,
352 POWER_SUPPLY_PROP_MANUFACTURER,
353};
354
355static enum power_supply_property bq27530_battery_props[] = {
356 POWER_SUPPLY_PROP_STATUS,
357 POWER_SUPPLY_PROP_PRESENT,
358 POWER_SUPPLY_PROP_VOLTAGE_NOW,
359 POWER_SUPPLY_PROP_CURRENT_NOW,
360 POWER_SUPPLY_PROP_CAPACITY,
361 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
362 POWER_SUPPLY_PROP_TEMP,
363 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
364 POWER_SUPPLY_PROP_TECHNOLOGY,
365 POWER_SUPPLY_PROP_CHARGE_FULL,
366 POWER_SUPPLY_PROP_CHARGE_NOW,
628ef02c
PV		 367 POWER_SUPPLY_PROP_POWER_AVG,
368 POWER_SUPPLY_PROP_HEALTH,
d74534c2 369 POWER_SUPPLY_PROP_CYCLE_COUNT,
db04fc5c 370 POWER_SUPPLY_PROP_MANUFACTURER,
628ef02c
PV		 371};
372
d74534c2 373static enum power_supply_property bq27541_battery_props[] = {
f46bf82e
AB		 374 POWER_SUPPLY_PROP_STATUS,
375 POWER_SUPPLY_PROP_PRESENT,
376 POWER_SUPPLY_PROP_VOLTAGE_NOW,
377 POWER_SUPPLY_PROP_CURRENT_NOW,
378 POWER_SUPPLY_PROP_CAPACITY,
379 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
380 POWER_SUPPLY_PROP_TEMP,
381 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
382 POWER_SUPPLY_PROP_TECHNOLOGY,
383 POWER_SUPPLY_PROP_CHARGE_FULL,
384 POWER_SUPPLY_PROP_CHARGE_NOW,
385 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
386 POWER_SUPPLY_PROP_CYCLE_COUNT,
387 POWER_SUPPLY_PROP_POWER_AVG,
388 POWER_SUPPLY_PROP_HEALTH,
db04fc5c 389 POWER_SUPPLY_PROP_MANUFACTURER,
f46bf82e
AB		 390};
391
d74534c2
AD		 392static enum power_supply_property bq27545_battery_props[] = {
393 POWER_SUPPLY_PROP_STATUS,
394 POWER_SUPPLY_PROP_PRESENT,
395 POWER_SUPPLY_PROP_VOLTAGE_NOW,
396 POWER_SUPPLY_PROP_CURRENT_NOW,
397 POWER_SUPPLY_PROP_CAPACITY,
398 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
399 POWER_SUPPLY_PROP_TEMP,
400 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
401 POWER_SUPPLY_PROP_TECHNOLOGY,
402 POWER_SUPPLY_PROP_CHARGE_FULL,
403 POWER_SUPPLY_PROP_CHARGE_NOW,
404 POWER_SUPPLY_PROP_HEALTH,
405 POWER_SUPPLY_PROP_CYCLE_COUNT,
406 POWER_SUPPLY_PROP_POWER_AVG,
407 POWER_SUPPLY_PROP_MANUFACTURER,
408};
409
410static enum power_supply_property bq27421_battery_props[] = {
411 POWER_SUPPLY_PROP_STATUS,
412 POWER_SUPPLY_PROP_PRESENT,
413 POWER_SUPPLY_PROP_VOLTAGE_NOW,
414 POWER_SUPPLY_PROP_CURRENT_NOW,
415 POWER_SUPPLY_PROP_CAPACITY,
416 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
417 POWER_SUPPLY_PROP_TEMP,
418 POWER_SUPPLY_PROP_TECHNOLOGY,
419 POWER_SUPPLY_PROP_CHARGE_FULL,
420 POWER_SUPPLY_PROP_CHARGE_NOW,
421 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
422 POWER_SUPPLY_PROP_MANUFACTURER,
423};
424
425#define BQ27XXX_PROP(_id, _prop) \
426 [_id] = { \
427 .props = _prop, \
428 .size = ARRAY_SIZE(_prop), \
429 }
430
431static struct {
432 enum power_supply_property *props;
433 size_t size;
434} bq27xxx_battery_props[] = {
435 BQ27XXX_PROP(BQ27000, bq27000_battery_props),
436 BQ27XXX_PROP(BQ27010, bq27010_battery_props),
437 BQ27XXX_PROP(BQ27500, bq27500_battery_props),
438 BQ27XXX_PROP(BQ27530, bq27530_battery_props),
439 BQ27XXX_PROP(BQ27541, bq27541_battery_props),
440 BQ27XXX_PROP(BQ27545, bq27545_battery_props),
441 BQ27XXX_PROP(BQ27421, bq27421_battery_props),
442};
443
740b755a
LPC		 444static unsigned int poll_interval = 360;
445module_param(poll_interval, uint, 0644);
6d0a1815
AD		 446MODULE_PARM_DESC(poll_interval,
447 "battery poll interval in seconds - 0 disables polling");
740b755a 448
b996ad0e 449/*
081bab21 450 * Common code for BQ27xxx devices
b996ad0e
RG		 451 */
452
d74534c2 453static inline int bq27xxx_read(struct bq27xxx_device_info *di, int reg_index,
ce33edfa 454 bool single)
b996ad0e 455{
d74534c2
AD		 456 /* Reports EINVAL for invalid/missing registers */
457 if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
458 return -EINVAL;
b996ad0e 459
d74534c2 460 return di->bus.read(di, di->regs[reg_index], single);
a66f59ba
SG		 461}
462
b996ad0e 463/*
c5709032 464 * Return the battery State-of-Charge
b996ad0e
RG		 465 * Or < 0 if something fails.
466 */
c5709032 467static int bq27xxx_battery_read_soc(struct bq27xxx_device_info *di)
b996ad0e 468{
c5709032 469 int soc;
b996ad0e 470
d74534c2 471 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
297a533b 472
c5709032
AD		 473 if (soc < 0)
474 dev_dbg(di->dev, "error reading State-of-Charge\n");
297a533b 475
c5709032 476 return soc;
b996ad0e
RG		 477}
478
631c17ee
PR		 479/*
480 * Return a battery charge value in µAh
481 * Or < 0 if something fails.
482 */
081bab21 483static int bq27xxx_battery_read_charge(struct bq27xxx_device_info *di, u8 reg)
631c17ee
PR		 484{
485 int charge;
486
081bab21 487 charge = bq27xxx_read(di, reg, false);
631c17ee 488 if (charge < 0) {
c6cd4f26
PR		 489 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
490 reg, charge);
631c17ee
PR		 491 return charge;
492 }
493
d74534c2
AD		 494 if (di->chip == BQ27000 || di->chip == BQ27010)
495 charge *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
631c17ee 496 else
d74534c2 497 charge *= 1000;
631c17ee
PR		 498
499 return charge;
500}
501
502/*
c5709032 503 * Return the battery Nominal available capacity in µAh
631c17ee
PR		 504 * Or < 0 if something fails.
505 */
081bab21 506static inline int bq27xxx_battery_read_nac(struct bq27xxx_device_info *di)
631c17ee 507{
e59ec4a1 508 int flags;
e59ec4a1 509
d74534c2
AD		 510 if (di->chip == BQ27000 || di->chip == BQ27010) {
511 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
512 if (flags >= 0 && (flags & BQ27000_FLAG_CI))
513 return -ENODATA;
514 }
e59ec4a1 515
d74534c2 516 return bq27xxx_battery_read_charge(di, BQ27XXX_REG_NAC);
631c17ee
PR		 517}
518
519/*
d74534c2 520 * Return the battery Full Charge Capacity in µAh
631c17ee
PR		 521 * Or < 0 if something fails.
522 */
d74534c2 523static inline int bq27xxx_battery_read_fcc(struct bq27xxx_device_info *di)
631c17ee 524{
d74534c2 525 return bq27xxx_battery_read_charge(di, BQ27XXX_REG_FCC);
631c17ee
PR		 526}
527
528/*
d74534c2 529 * Return the Design Capacity in µAh
631c17ee
PR		 530 * Or < 0 if something fails.
531 */
d74534c2 532static int bq27xxx_battery_read_dcap(struct bq27xxx_device_info *di)
631c17ee 533{
d74534c2 534 int dcap;
631c17ee 535
d74534c2 536 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
631c17ee 537
d74534c2 538 if (dcap < 0) {
c6cd4f26 539 dev_dbg(di->dev, "error reading initial last measured discharge\n");
d74534c2 540 return dcap;
631c17ee
PR		 541 }
542
d74534c2
AD		 543 if (di->chip == BQ27000 || di->chip == BQ27010)
544 dcap *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
631c17ee 545 else
d74534c2 546 dcap *= 1000;
631c17ee 547
d74534c2 548 return dcap;
631c17ee
PR		 549}
550
a8f6bd23
PR		 551/*
552 * Return the battery Available energy in µWh
553 * Or < 0 if something fails.
554 */
081bab21 555static int bq27xxx_battery_read_energy(struct bq27xxx_device_info *di)
a8f6bd23
PR		 556{
557 int ae;
558
d74534c2 559 ae = bq27xxx_read(di, BQ27XXX_REG_AE, false);
a8f6bd23 560 if (ae < 0) {
c6cd4f26 561 dev_dbg(di->dev, "error reading available energy\n");
a8f6bd23
PR		 562 return ae;
563 }
564
d74534c2
AD		 565 if (di->chip == BQ27000 || di->chip == BQ27010)
566 ae *= BQ27XXX_POWER_CONSTANT / BQ27XXX_RS;
a8f6bd23 567 else
d74534c2 568 ae *= 1000;
a8f6bd23
PR		 569
570 return ae;
571}
572
d149e98e 573/*
5dc3443e 574 * Return the battery temperature in tenths of degree Kelvin
d149e98e
PR		 575 * Or < 0 if something fails.
576 */
081bab21 577static int bq27xxx_battery_read_temperature(struct bq27xxx_device_info *di)
d149e98e
PR		 578{
579 int temp;
580
d74534c2 581 temp = bq27xxx_read(di, BQ27XXX_REG_TEMP, false);
d149e98e
PR		 582 if (temp < 0) {
583 dev_err(di->dev, "error reading temperature\n");
584 return temp;
585 }
586
d74534c2 587 if (di->chip == BQ27000 || di->chip == BQ27010)
5dc3443e 588 temp = 5 * temp / 2;
d149e98e
PR		 589
590 return temp;
591}
592
631c17ee
PR		 593/*
594 * Return the battery Cycle count total
595 * Or < 0 if something fails.
596 */
081bab21 597static int bq27xxx_battery_read_cyct(struct bq27xxx_device_info *di)
631c17ee
PR		 598{
599 int cyct;
600
d74534c2 601 cyct = bq27xxx_read(di, BQ27XXX_REG_CYCT, false);
631c17ee
PR		 602 if (cyct < 0)
603 dev_err(di->dev, "error reading cycle count total\n");
604
605 return cyct;
606}
607
b996ad0e 608/*
297a533b
LPC		 609 * Read a time register.
610 * Return < 0 if something fails.
b996ad0e 611 */
081bab21 612static int bq27xxx_battery_read_time(struct bq27xxx_device_info *di, u8 reg)
b996ad0e 613{
297a533b 614 int tval;
b996ad0e 615
081bab21 616 tval = bq27xxx_read(di, reg, false);
297a533b 617 if (tval < 0) {
c6cd4f26
PR		 618 dev_dbg(di->dev, "error reading time register %02x: %d\n",
619 reg, tval);
297a533b 620 return tval;
b996ad0e
RG		 621 }
622
297a533b
LPC		 623 if (tval == 65535)
624 return -ENODATA;
625
626 return tval * 60;
627}
628
9903e627 629/*
c5709032 630 * Read an average power register.
9903e627
SR		 631 * Return < 0 if something fails.
632 */
d74534c2 633static int bq27xxx_battery_read_pwr_avg(struct bq27xxx_device_info *di)
9903e627
SR		 634{
635 int tval;
636
d74534c2 637 tval = bq27xxx_read(di, BQ27XXX_REG_AP, false);
9903e627 638 if (tval < 0) {
d74534c2
AD		 639 dev_err(di->dev, "error reading average power register %02x: %d\n",
640 BQ27XXX_REG_AP, tval);
9903e627
SR		 641 return tval;
642 }
643
d74534c2
AD		 644 if (di->chip == BQ27000 || di->chip == BQ27010)
645 return (tval * BQ27XXX_POWER_CONSTANT) / BQ27XXX_RS;
646 else
9903e627 647 return tval;
d74534c2
AD		 648}
649
650/*
651 * Returns true if a battery over temperature condition is detected
652 */
653static int bq27xxx_battery_overtemp(struct bq27xxx_device_info *di, u16 flags)
654{
655 if (di->chip == BQ27500 || di->chip == BQ27541)
656 return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD);
9903e627 657 else
d74534c2 658 return flags & BQ27XXX_FLAG_OTC;
9903e627
SR		 659}
660
661/*
662 * Read flag register.
663 * Return < 0 if something fails.
664 */
081bab21 665static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di)
9903e627 666{
d74534c2 667 u16 tval;
9903e627 668
d74534c2 669 tval = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
9903e627
SR		 670 if (tval < 0) {
671 dev_err(di->dev, "error reading flag register:%d\n", tval);
672 return tval;
673 }
674
d74534c2
AD		 675 if (di->chip == BQ27000 || di->chip == BQ27010) {
676 if (tval & BQ27000_FLAG_EDV1)
9903e627 677 tval = POWER_SUPPLY_HEALTH_DEAD;
9903e627
SR		 678 else
679 tval = POWER_SUPPLY_HEALTH_GOOD;
9903e627 680 } else {
d74534c2 681 if (tval & BQ27XXX_FLAG_SOCF)
9903e627 682 tval = POWER_SUPPLY_HEALTH_DEAD;
d74534c2
AD		 683 else if (bq27xxx_battery_overtemp(di, tval))
684 tval = POWER_SUPPLY_HEALTH_OVERHEAT;
9903e627
SR		 685 else
686 tval = POWER_SUPPLY_HEALTH_GOOD;
9903e627
SR		 687 }
688
d74534c2 689 return tval;
9903e627
SR		 690}
691
081bab21 692static void bq27xxx_battery_update(struct bq27xxx_device_info *di)
297a533b 693{
081bab21 694 struct bq27xxx_reg_cache cache = {0, };
d74534c2
AD		 695 bool has_ci_flag = di->chip == BQ27000 || di->chip == BQ27010;
696 bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
297a533b 697
d74534c2 698 cache.flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
3dd843e1 699 if ((cache.flags & 0xff) == 0xff)
d74534c2 700 cache.flags = -1; /* read error */
297a533b 701 if (cache.flags >= 0) {
d74534c2
AD		 702 cache.temperature = bq27xxx_battery_read_temperature(di);
703 if (has_ci_flag && (cache.flags & BQ27000_FLAG_CI)) {
c6cd4f26 704 dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
4b226c2c 705 cache.capacity = -ENODATA;
a8f6bd23 706 cache.energy = -ENODATA;
4b226c2c
PR		 707 cache.time_to_empty = -ENODATA;
708 cache.time_to_empty_avg = -ENODATA;
709 cache.time_to_full = -ENODATA;
710 cache.charge_full = -ENODATA;
9903e627 711 cache.health = -ENODATA;
4b226c2c 712 } else {
d74534c2
AD		 713 if (di->regs[BQ27XXX_REG_TTE] != INVALID_REG_ADDR)
714 cache.time_to_empty = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTE);
715 if (di->regs[BQ27XXX_REG_TTECP] != INVALID_REG_ADDR)
716 cache.time_to_empty_avg = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTECP);
717 if (di->regs[BQ27XXX_REG_TTF] != INVALID_REG_ADDR)
718 cache.time_to_full = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTF);
719 cache.charge_full = bq27xxx_battery_read_fcc(di);
c5709032 720 cache.capacity = bq27xxx_battery_read_soc(di);
d74534c2 721 if (di->regs[BQ27XXX_REG_AE] != INVALID_REG_ADDR)
081bab21 722 cache.energy = bq27xxx_battery_read_energy(di);
081bab21 723 cache.health = bq27xxx_battery_read_health(di);
4b226c2c 724 }
d74534c2 725 if (di->regs[BQ27XXX_REG_CYCT] != INVALID_REG_ADDR)
081bab21 726 cache.cycle_count = bq27xxx_battery_read_cyct(di);
d74534c2
AD		 727 if (di->regs[BQ27XXX_REG_AP] != INVALID_REG_ADDR)
728 cache.power_avg = bq27xxx_battery_read_pwr_avg(di);
297a533b 729
631c17ee
PR		 730 /* We only have to read charge design full once */
731 if (di->charge_design_full <= 0)
d74534c2 732 di->charge_design_full = bq27xxx_battery_read_dcap(di);
297a533b
LPC		 733 }
734
90f04a28 735 if (di->cache.capacity != cache.capacity)
297d716f 736 power_supply_changed(di->bat);
90f04a28
PV		 737
738 if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
739 di->cache = cache;
297a533b
LPC		 740
741 di->last_update = jiffies;
742}
743
081bab21 744static void bq27xxx_battery_poll(struct work_struct *work)
740b755a 745{
081bab21 746 struct bq27xxx_device_info *di =
d74534c2
AD		 747 container_of(work, struct bq27xxx_device_info,
748 work.work);
740b755a 749
081bab21 750 bq27xxx_battery_update(di);
740b755a
LPC		 751
752 if (poll_interval > 0) {
753 /* The timer does not have to be accurate. */
754 set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
755 schedule_delayed_work(&di->work, poll_interval * HZ);
756 }
757}
758
b996ad0e 759/*
bf7d4140 760 * Return the battery average current in µA
b996ad0e
RG		 761 * Note that current can be negative signed as well
762 * Or 0 if something fails.
763 */
081bab21 764static int bq27xxx_battery_current(struct bq27xxx_device_info *di,
ce33edfa 765 union power_supply_propval *val)
b996ad0e 766{
297a533b 767 int curr;
b68f6216 768 int flags;
b996ad0e 769
d74534c2 770 curr = bq27xxx_read(di, BQ27XXX_REG_AI, false);
c6cd4f26
PR		 771 if (curr < 0) {
772 dev_err(di->dev, "error reading current\n");
297a533b 773 return curr;
c6cd4f26 774 }
e20908d9 775
d74534c2
AD		 776 if (di->chip == BQ27000 || di->chip == BQ27010) {
777 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
b68f6216 778 if (flags & BQ27000_FLAG_CHGS) {
e20908d9 779 dev_dbg(di->dev, "negative current!\n");
afbc74fd 780 curr = -curr;
e20908d9 781 }
b996ad0e 782
d74534c2
AD		 783 val->intval = curr * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
784 } else {
785 /* Other gauges return signed value */
786 val->intval = (int)((s16)curr) * 1000;
b996ad0e
RG		 787 }
788
297a533b 789 return 0;
b996ad0e
RG		 790}
791
081bab21 792static int bq27xxx_battery_status(struct bq27xxx_device_info *di,
ce33edfa 793 union power_supply_propval *val)
4e924a81 794{
4e924a81 795 int status;
4e924a81 796
d74534c2 797 if (di->chip == BQ27000 || di->chip == BQ27010) {
c1b9ab67
LPC		 798 if (di->cache.flags & BQ27000_FLAG_FC)
799 status = POWER_SUPPLY_STATUS_FULL;
800 else if (di->cache.flags & BQ27000_FLAG_CHGS)
4e924a81 801 status = POWER_SUPPLY_STATUS_CHARGING;
297d716f 802 else if (power_supply_am_i_supplied(di->bat))
c1b9ab67 803 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
4e924a81
GI		 804 else
805 status = POWER_SUPPLY_STATUS_DISCHARGING;
d74534c2
AD		 806 } else {
807 if (di->cache.flags & BQ27XXX_FLAG_FC)
808 status = POWER_SUPPLY_STATUS_FULL;
809 else if (di->cache.flags & BQ27XXX_FLAG_DSC)
810 status = POWER_SUPPLY_STATUS_DISCHARGING;
811 else
812 status = POWER_SUPPLY_STATUS_CHARGING;
4e924a81
GI		 813 }
814
815 val->intval = status;
297a533b 816
4e924a81
GI		 817 return 0;
818}
819
081bab21 820static int bq27xxx_battery_capacity_level(struct bq27xxx_device_info *di,
ce33edfa 821 union power_supply_propval *val)
d66bab3f
PR		 822{
823 int level;
824
d74534c2
AD		 825 if (di->chip == BQ27000 || di->chip == BQ27010) {
826 if (di->cache.flags & BQ27000_FLAG_FC)
d66bab3f 827 level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
d74534c2 828 else if (di->cache.flags & BQ27000_FLAG_EDV1)
d66bab3f 829 level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
d74534c2 830 else if (di->cache.flags & BQ27000_FLAG_EDVF)
d66bab3f
PR		 831 level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
832 else
833 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
834 } else {
d74534c2 835 if (di->cache.flags & BQ27XXX_FLAG_FC)
d66bab3f 836 level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
d74534c2 837 else if (di->cache.flags & BQ27XXX_FLAG_SOC1)
d66bab3f 838 level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
d74534c2 839 else if (di->cache.flags & BQ27XXX_FLAG_SOCF)
d66bab3f
PR		 840 level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
841 else
842 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
843 }
844
845 val->intval = level;
846
847 return 0;
848}
849
4e924a81 850/*
91fe4d50 851 * Return the battery Voltage in millivolts
297a533b 852 * Or < 0 if something fails.
4e924a81 853 */
081bab21 854static int bq27xxx_battery_voltage(struct bq27xxx_device_info *di,
ce33edfa 855 union power_supply_propval *val)
4e924a81 856{
297a533b 857 int volt;
4e924a81 858
d74534c2 859 volt = bq27xxx_read(di, BQ27XXX_REG_VOLT, false);
c6cd4f26
PR		 860 if (volt < 0) {
861 dev_err(di->dev, "error reading voltage\n");
297a533b 862 return volt;
c6cd4f26 863 }
4e924a81 864
297a533b
LPC		 865 val->intval = volt * 1000;
866
867 return 0;
868}
869
081bab21 870static int bq27xxx_simple_value(int value,
ce33edfa 871 union power_supply_propval *val)
297a533b
LPC		 872{
873 if (value < 0)
874 return value;
875
876 val->intval = value;
4e924a81 877
4e924a81
GI		 878 return 0;
879}
880
081bab21 881static int bq27xxx_battery_get_property(struct power_supply *psy,
b996ad0e
RG		 882 enum power_supply_property psp,
883 union power_supply_propval *val)
884{
4e924a81 885 int ret = 0;
081bab21 886 struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
3413b4ea 887
740b755a
LPC		 888 mutex_lock(&di->lock);
889 if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
890 cancel_delayed_work_sync(&di->work);
081bab21 891 bq27xxx_battery_poll(&di->work.work);
740b755a
LPC		 892 }
893 mutex_unlock(&di->lock);
297a533b
LPC		 894
895 if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
3413b4ea 896 return -ENODEV;
b996ad0e
RG		 897
898 switch (psp) {
4e924a81 899 case POWER_SUPPLY_PROP_STATUS:
081bab21 900 ret = bq27xxx_battery_status(di, val);
4e924a81 901 break;
b996ad0e 902 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
081bab21 903 ret = bq27xxx_battery_voltage(di, val);
3413b4ea 904 break;
b996ad0e 905 case POWER_SUPPLY_PROP_PRESENT:
297a533b 906 val->intval = di->cache.flags < 0 ? 0 : 1;
b996ad0e
RG		 907 break;
908 case POWER_SUPPLY_PROP_CURRENT_NOW:
081bab21 909 ret = bq27xxx_battery_current(di, val);
b996ad0e
RG		 910 break;
911 case POWER_SUPPLY_PROP_CAPACITY:
081bab21 912 ret = bq27xxx_simple_value(di->cache.capacity, val);
b996ad0e 913 break;
d66bab3f 914 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
081bab21 915 ret = bq27xxx_battery_capacity_level(di, val);
d66bab3f 916 break;
b996ad0e 917 case POWER_SUPPLY_PROP_TEMP:
081bab21 918 ret = bq27xxx_simple_value(di->cache.temperature, val);
5dc3443e 919 if (ret == 0)
d74534c2 920 val->intval -= 2731; /* convert decidegree k to c */
b996ad0e 921 break;
4e924a81 922 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
081bab21 923 ret = bq27xxx_simple_value(di->cache.time_to_empty, val);
4e924a81
GI		 924 break;
925 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
081bab21 926 ret = bq27xxx_simple_value(di->cache.time_to_empty_avg, val);
4e924a81
GI		 927 break;
928 case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
081bab21 929 ret = bq27xxx_simple_value(di->cache.time_to_full, val);
4e924a81 930 break;
5661f334
LPC		 931 case POWER_SUPPLY_PROP_TECHNOLOGY:
932 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
933 break;
631c17ee 934 case POWER_SUPPLY_PROP_CHARGE_NOW:
081bab21 935 ret = bq27xxx_simple_value(bq27xxx_battery_read_nac(di), val);
631c17ee
PR		 936 break;
937 case POWER_SUPPLY_PROP_CHARGE_FULL:
081bab21 938 ret = bq27xxx_simple_value(di->cache.charge_full, val);
631c17ee
PR		 939 break;
940 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
081bab21 941 ret = bq27xxx_simple_value(di->charge_design_full, val);
631c17ee 942 break;
73c244a8 943 case POWER_SUPPLY_PROP_CYCLE_COUNT:
081bab21 944 ret = bq27xxx_simple_value(di->cache.cycle_count, val);
631c17ee
PR		 945 break;
946 case POWER_SUPPLY_PROP_ENERGY_NOW:
081bab21 947 ret = bq27xxx_simple_value(di->cache.energy, val);
631c17ee 948 break;
9903e627 949 case POWER_SUPPLY_PROP_POWER_AVG:
081bab21 950 ret = bq27xxx_simple_value(di->cache.power_avg, val);
9903e627
SR		 951 break;
952 case POWER_SUPPLY_PROP_HEALTH:
081bab21 953 ret = bq27xxx_simple_value(di->cache.health, val);
9903e627 954 break;
db04fc5c
AD		 955 case POWER_SUPPLY_PROP_MANUFACTURER:
956 val->strval = BQ27XXX_MANUFACTURER;
957 break;
b996ad0e
RG		 958 default:
959 return -EINVAL;
960 }
961
4e924a81 962 return ret;
b996ad0e
RG		 963}
964
081bab21 965static void bq27xxx_external_power_changed(struct power_supply *psy)
740b755a 966{
081bab21 967 struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
740b755a
LPC		 968
969 cancel_delayed_work_sync(&di->work);
970 schedule_delayed_work(&di->work, 0);
971}
972
081bab21 973static int bq27xxx_powersupply_init(struct bq27xxx_device_info *di,
297d716f 974 const char *name)
b996ad0e 975{
a40402ef 976 int ret;
297d716f
KK		 977 struct power_supply_desc *psy_desc;
978 struct power_supply_config psy_cfg = { .drv_data = di, };
979
980 psy_desc = devm_kzalloc(di->dev, sizeof(*psy_desc), GFP_KERNEL);
981 if (!psy_desc)
982 return -ENOMEM;
a40402ef 983
297d716f
KK		 984 psy_desc->name = name;
985 psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
d74534c2
AD		 986 psy_desc->properties = bq27xxx_battery_props[di->chip].props;
987 psy_desc->num_properties = bq27xxx_battery_props[di->chip].size;
081bab21
AD		 988 psy_desc->get_property = bq27xxx_battery_get_property;
989 psy_desc->external_power_changed = bq27xxx_external_power_changed;
740b755a 990
081bab21 991 INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
740b755a 992 mutex_init(&di->lock);
a40402ef 993
297d716f
KK		 994 di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
995 if (IS_ERR(di->bat)) {
996 ret = PTR_ERR(di->bat);
a40402ef
LPC		 997 dev_err(di->dev, "failed to register battery: %d\n", ret);
998 return ret;
999 }
1000
1001 dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
1002
081bab21 1003 bq27xxx_battery_update(di);
297a533b 1004
a40402ef 1005 return 0;
b996ad0e
RG		 1006}
1007
081bab21 1008static void bq27xxx_powersupply_unregister(struct bq27xxx_device_info *di)
740b755a 1009{
8cfaaa81 1010 /*
081bab21
AD		 1011 * power_supply_unregister call bq27xxx_battery_get_property which
1012 * call bq27xxx_battery_poll.
1013 * Make sure that bq27xxx_battery_poll will not call
8cfaaa81
PR		 1014 * schedule_delayed_work again after unregister (which cause OOPS).
1015 */
1016 poll_interval = 0;
1017
740b755a
LPC		 1018 cancel_delayed_work_sync(&di->work);
1019
297d716f 1020 power_supply_unregister(di->bat);
740b755a
LPC		 1021
1022 mutex_destroy(&di->lock);
1023}
1024
7fb7ba58 1025/* i2c specific code */
081bab21 1026#ifdef CONFIG_BATTERY_BQ27XXX_I2C
7fb7ba58
LPC		 1027
1028/* If the system has several batteries we need a different name for each
1029 * of them...
b996ad0e 1030 */
7fb7ba58
LPC		 1031static DEFINE_IDR(battery_id);
1032static DEFINE_MUTEX(battery_mutex);
b996ad0e 1033
081bab21
AD		 1034static int bq27xxx_battery_i2c_read(struct bq27xxx_device_info *di, u8 reg,
1035 bool single)
b996ad0e 1036{
a40402ef 1037 struct i2c_client *client = to_i2c_client(di->dev);
9e912f45 1038 struct i2c_msg msg[2];
b996ad0e 1039 unsigned char data[2];
297a533b 1040 int ret;
b996ad0e
RG		 1041
1042 if (!client->adapter)
1043 return -ENODEV;
1044
9e912f45
GI		 1045 msg[0].addr = client->addr;
1046 msg[0].flags = 0;
1047 msg[0].buf = &reg;
1048 msg[0].len = sizeof(reg);
1049 msg[1].addr = client->addr;
1050 msg[1].flags = I2C_M_RD;
1051 msg[1].buf = data;
2ec523a8 1052 if (single)
9e912f45 1053 msg[1].len = 1;
2ec523a8 1054 else
9e912f45 1055 msg[1].len = 2;
2ec523a8 1056
9e912f45 1057 ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
2ec523a8
LPC		 1058 if (ret < 0)
1059 return ret;
1060
1061 if (!single)
1062 ret = get_unaligned_le16(data);
1063 else
1064 ret = data[0];
b996ad0e 1065
297a533b 1066 return ret;
b996ad0e
RG		 1067}
1068
081bab21
AD		 1069static int bq27xxx_battery_i2c_probe(struct i2c_client *client,
1070 const struct i2c_device_id *id)
b996ad0e
RG		 1071{
1072 char *name;
081bab21 1073 struct bq27xxx_device_info *di;
b996ad0e
RG		 1074 int num;
1075 int retval = 0;
1076
1077 /* Get new ID for the new battery device */
b996ad0e 1078 mutex_lock(&battery_mutex);
05e2cefa 1079 num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
b996ad0e 1080 mutex_unlock(&battery_mutex);
05e2cefa
TH		 1081 if (num < 0)
1082 return num;
b996ad0e 1083
297d716f 1084 name = devm_kasprintf(&client->dev, GFP_KERNEL, "%s-%d", id->name, num);
b996ad0e 1085 if (!name) {
b996ad0e 1086 retval = -ENOMEM;
297d716f 1087 goto batt_failed;
b996ad0e
RG		 1088 }
1089
1cb82fdb 1090 di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
b996ad0e 1091 if (!di) {
b996ad0e 1092 retval = -ENOMEM;
297d716f 1093 goto batt_failed;
b996ad0e 1094 }
a40402ef 1095
b996ad0e 1096 di->id = num;
a40402ef 1097 di->dev = &client->dev;
e20908d9 1098 di->chip = id->driver_data;
081bab21 1099 di->bus.read = &bq27xxx_battery_i2c_read;
d74534c2 1100 di->regs = bq27xxx_regs[di->chip];
b996ad0e 1101
081bab21 1102 retval = bq27xxx_powersupply_init(di, name);
f7760995 1103 if (retval)
297d716f 1104 goto batt_failed;
b996ad0e 1105
d74534c2
AD		 1106 /* Schedule a polling after about 1 min */
1107 schedule_delayed_work(&di->work, 60 * HZ);
1108
b996ad0e 1109 i2c_set_clientdata(client, di);
b996ad0e
RG		 1110
1111 return 0;
1112
297d716f 1113batt_failed:
b996ad0e
RG		 1114 mutex_lock(&battery_mutex);
1115 idr_remove(&battery_id, num);
1116 mutex_unlock(&battery_mutex);
1117
1118 return retval;
1119}
1120
081bab21 1121static int bq27xxx_battery_i2c_remove(struct i2c_client *client)
b996ad0e 1122{
081bab21 1123 struct bq27xxx_device_info *di = i2c_get_clientdata(client);
b996ad0e 1124
081bab21 1125 bq27xxx_powersupply_unregister(di);
b996ad0e 1126
b996ad0e
RG		 1127 mutex_lock(&battery_mutex);
1128 idr_remove(&battery_id, di->id);
1129 mutex_unlock(&battery_mutex);
1130
b996ad0e
RG		 1131 return 0;
1132}
1133
081bab21 1134static const struct i2c_device_id bq27xxx_id[] = {
d74534c2
AD		 1135 { "bq27200", BQ27000 },
1136 { "bq27210", BQ27010 },
e20908d9 1137 { "bq27500", BQ27500 },
d74534c2
AD		 1138 { "bq27510", BQ27500 },
1139 { "bq27520", BQ27500 },
1140 { "bq27530", BQ27530 },
1141 { "bq27531", BQ27530 },
1142 { "bq27541", BQ27541 },
1143 { "bq27542", BQ27541 },
1144 { "bq27546", BQ27541 },
1145 { "bq27742", BQ27541 },
1146 { "bq27545", BQ27545 },
1147 { "bq27421", BQ27421 },
1148 { "bq27425", BQ27421 },
1149 { "bq27441", BQ27421 },
1150 { "bq27621", BQ27421 },
b996ad0e
RG		 1151 {},
1152};
081bab21 1153MODULE_DEVICE_TABLE(i2c, bq27xxx_id);
b996ad0e 1154
081bab21 1155static struct i2c_driver bq27xxx_battery_i2c_driver = {
b996ad0e 1156 .driver = {
081bab21 1157 .name = "bq27xxx-battery",
b996ad0e 1158 },
081bab21
AD		 1159 .probe = bq27xxx_battery_i2c_probe,
1160 .remove = bq27xxx_battery_i2c_remove,
1161 .id_table = bq27xxx_id,
b996ad0e
RG		 1162};
1163
081bab21 1164static inline int bq27xxx_battery_i2c_init(void)
7fb7ba58 1165{
081bab21 1166 int ret = i2c_add_driver(&bq27xxx_battery_i2c_driver);
6d0a1815 1167
7fb7ba58 1168 if (ret)
081bab21 1169 pr_err("Unable to register BQ27xxx i2c driver\n");
7fb7ba58
LPC		 1170
1171 return ret;
1172}
1173
081bab21 1174static inline void bq27xxx_battery_i2c_exit(void)
7fb7ba58 1175{
081bab21 1176 i2c_del_driver(&bq27xxx_battery_i2c_driver);
7fb7ba58
LPC		 1177}
1178
1179#else
1180
081bab21
AD		 1181static inline int bq27xxx_battery_i2c_init(void) { return 0; }
1182static inline void bq27xxx_battery_i2c_exit(void) {};
7fb7ba58
LPC		 1183
1184#endif
1185
1186/* platform specific code */
081bab21 1187#ifdef CONFIG_BATTERY_BQ27XXX_PLATFORM
7fb7ba58 1188
081bab21
AD		 1189static int bq27xxx_battery_platform_read(struct bq27xxx_device_info *di, u8 reg,
1190 bool single)
7fb7ba58
LPC		 1191{
1192 struct device *dev = di->dev;
081bab21 1193 struct bq27xxx_platform_data *pdata = dev->platform_data;
7fb7ba58
LPC		 1194 unsigned int timeout = 3;
1195 int upper, lower;
1196 int temp;
1197
1198 if (!single) {
1199 /* Make sure the value has not changed in between reading the
1200 * lower and the upper part */
1201 upper = pdata->read(dev, reg + 1);
1202 do {
1203 temp = upper;
1204 if (upper < 0)
1205 return upper;
1206
1207 lower = pdata->read(dev, reg);
1208 if (lower < 0)
1209 return lower;
1210
1211 upper = pdata->read(dev, reg + 1);
1212 } while (temp != upper && --timeout);
1213
1214 if (timeout == 0)
1215 return -EIO;
1216
297a533b 1217 return (upper << 8) | lower;
7fb7ba58 1218 }
297a533b
LPC		 1219
1220 return pdata->read(dev, reg);
7fb7ba58
LPC		 1221}
1222
081bab21 1223static int bq27xxx_battery_platform_probe(struct platform_device *pdev)
7fb7ba58 1224{
081bab21
AD		 1225 struct bq27xxx_device_info *di;
1226 struct bq27xxx_platform_data *pdata = pdev->dev.platform_data;
297d716f 1227 const char *name;
7fb7ba58
LPC		 1228
1229 if (!pdata) {
1230 dev_err(&pdev->dev, "no platform_data supplied\n");
1231 return -EINVAL;
1232 }
1233
1234 if (!pdata->read) {
1235 dev_err(&pdev->dev, "no hdq read callback supplied\n");
1236 return -EINVAL;
1237 }
1238
424cfde4
AD		 1239 if (!pdata->chip) {
1240 dev_err(&pdev->dev, "no device supplied\n");
1241 return -EINVAL;
1242 }
1243
1cb82fdb 1244 di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
6d0a1815 1245 if (!di)
7fb7ba58 1246 return -ENOMEM;
7fb7ba58
LPC		 1247
1248 platform_set_drvdata(pdev, di);
1249
1250 di->dev = &pdev->dev;
424cfde4 1251 di->chip = pdata->chip;
7fb7ba58 1252
297d716f 1253 name = pdata->name ?: dev_name(&pdev->dev);
081bab21 1254 di->bus.read = &bq27xxx_battery_platform_read;
7fb7ba58 1255
081bab21 1256 return bq27xxx_powersupply_init(di, name);
7fb7ba58
LPC		 1257}
1258
081bab21 1259static int bq27xxx_battery_platform_remove(struct platform_device *pdev)
7fb7ba58 1260{
081bab21 1261 struct bq27xxx_device_info *di = platform_get_drvdata(pdev);
7fb7ba58 1262
081bab21 1263 bq27xxx_powersupply_unregister(di);
740b755a 1264
7fb7ba58
LPC		 1265 return 0;
1266}
1267
081bab21
AD		 1268static struct platform_driver bq27xxx_battery_platform_driver = {
1269 .probe = bq27xxx_battery_platform_probe,
1270 .remove = bq27xxx_battery_platform_remove,
7fb7ba58
LPC		 1271 .driver = {
1272 .name = "bq27000-battery",
7fb7ba58
LPC		 1273 },
1274};
1275
081bab21 1276static inline int bq27xxx_battery_platform_init(void)
7fb7ba58 1277{
081bab21 1278 int ret = platform_driver_register(&bq27xxx_battery_platform_driver);
6d0a1815 1279
7fb7ba58 1280 if (ret)
081bab21 1281 pr_err("Unable to register BQ27xxx platform driver\n");
7fb7ba58
LPC		 1282
1283 return ret;
1284}
1285
081bab21 1286static inline void bq27xxx_battery_platform_exit(void)
7fb7ba58 1287{
081bab21 1288 platform_driver_unregister(&bq27xxx_battery_platform_driver);
7fb7ba58
LPC		 1289}
1290
1291#else
1292
081bab21
AD		 1293static inline int bq27xxx_battery_platform_init(void) { return 0; }
1294static inline void bq27xxx_battery_platform_exit(void) {};
7fb7ba58
LPC		 1295
1296#endif
1297
1298/*
1299 * Module stuff
1300 */
1301
081bab21 1302static int __init bq27xxx_battery_init(void)
b996ad0e
RG		 1303{
1304 int ret;
1305
081bab21 1306 ret = bq27xxx_battery_i2c_init();
7fb7ba58
LPC		 1307 if (ret)
1308 return ret;
1309
081bab21 1310 ret = bq27xxx_battery_platform_init();
b996ad0e 1311 if (ret)
081bab21 1312 bq27xxx_battery_i2c_exit();
b996ad0e
RG		 1313
1314 return ret;
1315}
081bab21 1316module_init(bq27xxx_battery_init);
b996ad0e 1317
081bab21 1318static void __exit bq27xxx_battery_exit(void)
b996ad0e 1319{
081bab21
AD		 1320 bq27xxx_battery_platform_exit();
1321 bq27xxx_battery_i2c_exit();
b996ad0e 1322}
081bab21 1323module_exit(bq27xxx_battery_exit);
b996ad0e 1324
081bab21 1325#ifdef CONFIG_BATTERY_BQ27XXX_PLATFORM
8ebb7e9c
MB		 1326MODULE_ALIAS("platform:bq27000-battery");
1327#endif
1328
b996ad0e 1329MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
081bab21 1330MODULE_DESCRIPTION("BQ27xxx battery monitor driver");
b996ad0e 1331MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)