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Merge branch 'enable-devices' into omap-for-v4.5/fixes
[deliverable/linux.git] / drivers / power / bq27xxx_battery.c
1 /*
2 * BQ27xxx battery driver
3 *
4 * Copyright (C) 2008 Rodolfo Giometti <giometti@linux.it>
5 * Copyright (C) 2008 Eurotech S.p.A. <info@eurotech.it>
6 * Copyright (C) 2010-2011 Lars-Peter Clausen <lars@metafoo.de>
7 * Copyright (C) 2011 Pali Rohár <pali.rohar@gmail.com>
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 * Datasheets:
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
35 * http://www.ti.com/product/bq27425-g1
36 * http://www.ti.com/product/bq27411-g1
37 * http://www.ti.com/product/bq27621-g1
38 */
39
40 #include <linux/device.h>
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/slab.h>
49
50 #include <linux/power/bq27xxx_battery.h>
51
52 #define DRIVER_VERSION "1.2.0"
53
54 #define BQ27XXX_MANUFACTURER "Texas Instruments"
55
56 /* BQ27XXX Flags */
57 #define BQ27XXX_FLAG_DSC BIT(0)
58 #define BQ27XXX_FLAG_SOCF BIT(1) /* State-of-Charge threshold final */
59 #define BQ27XXX_FLAG_SOC1 BIT(2) /* State-of-Charge threshold 1 */
60 #define BQ27XXX_FLAG_FC BIT(9)
61 #define BQ27XXX_FLAG_OTD BIT(14)
62 #define BQ27XXX_FLAG_OTC BIT(15)
63 #define BQ27XXX_FLAG_UT BIT(14)
64 #define BQ27XXX_FLAG_OT BIT(15)
65
66 /* BQ27000 has different layout for Flags register */
67 #define BQ27000_FLAG_EDVF BIT(0) /* Final End-of-Discharge-Voltage flag */
68 #define BQ27000_FLAG_EDV1 BIT(1) /* First End-of-Discharge-Voltage flag */
69 #define BQ27000_FLAG_CI BIT(4) /* Capacity Inaccurate flag */
70 #define BQ27000_FLAG_FC BIT(5)
71 #define BQ27000_FLAG_CHGS BIT(7) /* Charge state flag */
72
73 #define BQ27XXX_RS (20) /* Resistor sense mOhm */
74 #define BQ27XXX_POWER_CONSTANT (29200) /* 29.2 µV^2 * 1000 */
75 #define BQ27XXX_CURRENT_CONSTANT (3570) /* 3.57 µV * 1000 */
76
77 #define INVALID_REG_ADDR 0xff
78
79 /*
80 * bq27xxx_reg_index - Register names
81 *
82 * These are indexes into a device's register mapping array.
83 */
84 enum bq27xxx_reg_index {
85 BQ27XXX_REG_CTRL = 0, /* Control */
86 BQ27XXX_REG_TEMP, /* Temperature */
87 BQ27XXX_REG_INT_TEMP, /* Internal Temperature */
88 BQ27XXX_REG_VOLT, /* Voltage */
89 BQ27XXX_REG_AI, /* Average Current */
90 BQ27XXX_REG_FLAGS, /* Flags */
91 BQ27XXX_REG_TTE, /* Time-to-Empty */
92 BQ27XXX_REG_TTF, /* Time-to-Full */
93 BQ27XXX_REG_TTES, /* Time-to-Empty Standby */
94 BQ27XXX_REG_TTECP, /* Time-to-Empty at Constant Power */
95 BQ27XXX_REG_NAC, /* Nominal Available Capacity */
96 BQ27XXX_REG_FCC, /* Full Charge Capacity */
97 BQ27XXX_REG_CYCT, /* Cycle Count */
98 BQ27XXX_REG_AE, /* Available Energy */
99 BQ27XXX_REG_SOC, /* State-of-Charge */
100 BQ27XXX_REG_DCAP, /* Design Capacity */
101 BQ27XXX_REG_AP, /* Average Power */
102 };
103
104 /* Register mappings */
105 static u8 bq27000_regs[] = {
106 0x00, /* CONTROL */
107 0x06, /* TEMP */
108 INVALID_REG_ADDR, /* INT TEMP - NA*/
109 0x08, /* VOLT */
110 0x14, /* AVG CURR */
111 0x0a, /* FLAGS */
112 0x16, /* TTE */
113 0x18, /* TTF */
114 0x1c, /* TTES */
115 0x26, /* TTECP */
116 0x0c, /* NAC */
117 0x12, /* LMD(FCC) */
118 0x2a, /* CYCT */
119 0x22, /* AE */
120 0x0b, /* SOC(RSOC) */
121 0x76, /* DCAP(ILMD) */
122 0x24, /* AP */
123 };
124
125 static u8 bq27010_regs[] = {
126 0x00, /* CONTROL */
127 0x06, /* TEMP */
128 INVALID_REG_ADDR, /* INT TEMP - NA*/
129 0x08, /* VOLT */
130 0x14, /* AVG CURR */
131 0x0a, /* FLAGS */
132 0x16, /* TTE */
133 0x18, /* TTF */
134 0x1c, /* TTES */
135 0x26, /* TTECP */
136 0x0c, /* NAC */
137 0x12, /* LMD(FCC) */
138 0x2a, /* CYCT */
139 INVALID_REG_ADDR, /* AE - NA */
140 0x0b, /* SOC(RSOC) */
141 0x76, /* DCAP(ILMD) */
142 INVALID_REG_ADDR, /* AP - NA */
143 };
144
145 static u8 bq27500_regs[] = {
146 0x00, /* CONTROL */
147 0x06, /* TEMP */
148 0x28, /* INT TEMP */
149 0x08, /* VOLT */
150 0x14, /* AVG CURR */
151 0x0a, /* FLAGS */
152 0x16, /* TTE */
153 INVALID_REG_ADDR, /* TTF - NA */
154 0x1a, /* TTES */
155 INVALID_REG_ADDR, /* TTECP - NA */
156 0x0c, /* NAC */
157 0x12, /* LMD(FCC) */
158 0x2a, /* CYCT */
159 INVALID_REG_ADDR, /* AE - NA */
160 0x2c, /* SOC(RSOC) */
161 0x3c, /* DCAP(ILMD) */
162 INVALID_REG_ADDR, /* AP - NA */
163 };
164
165 static u8 bq27530_regs[] = {
166 0x00, /* CONTROL */
167 0x06, /* TEMP */
168 0x32, /* INT TEMP */
169 0x08, /* VOLT */
170 0x14, /* AVG CURR */
171 0x0a, /* FLAGS */
172 0x16, /* TTE */
173 INVALID_REG_ADDR, /* TTF - NA */
174 INVALID_REG_ADDR, /* TTES - NA */
175 INVALID_REG_ADDR, /* TTECP - NA */
176 0x0c, /* NAC */
177 0x12, /* LMD(FCC) */
178 0x2a, /* CYCT */
179 INVALID_REG_ADDR, /* AE - NA */
180 0x2c, /* SOC(RSOC) */
181 INVALID_REG_ADDR, /* DCAP - NA */
182 0x24, /* AP */
183 };
184
185 static u8 bq27541_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 INVALID_REG_ADDR, /* TTES - NA */
195 INVALID_REG_ADDR, /* TTECP - NA */
196 0x0c, /* NAC */
197 0x12, /* LMD(FCC) */
198 0x2a, /* CYCT */
199 INVALID_REG_ADDR, /* AE - NA */
200 0x2c, /* SOC(RSOC) */
201 0x3c, /* DCAP */
202 0x24, /* AP */
203 };
204
205 static u8 bq27545_regs[] = {
206 0x00, /* CONTROL */
207 0x06, /* TEMP */
208 0x28, /* 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
225 static u8 bq27421_regs[] = {
226 0x00, /* CONTROL */
227 0x02, /* TEMP */
228 0x1e, /* INT TEMP */
229 0x04, /* VOLT */
230 0x10, /* AVG CURR */
231 0x06, /* FLAGS */
232 INVALID_REG_ADDR, /* TTE - NA */
233 INVALID_REG_ADDR, /* TTF - NA */
234 INVALID_REG_ADDR, /* TTES - NA */
235 INVALID_REG_ADDR, /* TTECP - NA */
236 0x08, /* NAC */
237 0x0e, /* FCC */
238 INVALID_REG_ADDR, /* CYCT - NA */
239 INVALID_REG_ADDR, /* AE - NA */
240 0x1c, /* SOC */
241 0x3c, /* DCAP */
242 0x18, /* AP */
243 };
244
245 static u8 *bq27xxx_regs[] = {
246 [BQ27000] = bq27000_regs,
247 [BQ27010] = bq27010_regs,
248 [BQ27500] = bq27500_regs,
249 [BQ27530] = bq27530_regs,
250 [BQ27541] = bq27541_regs,
251 [BQ27545] = bq27545_regs,
252 [BQ27421] = bq27421_regs,
253 };
254
255 static enum power_supply_property bq27000_battery_props[] = {
256 POWER_SUPPLY_PROP_STATUS,
257 POWER_SUPPLY_PROP_PRESENT,
258 POWER_SUPPLY_PROP_VOLTAGE_NOW,
259 POWER_SUPPLY_PROP_CURRENT_NOW,
260 POWER_SUPPLY_PROP_CAPACITY,
261 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
262 POWER_SUPPLY_PROP_TEMP,
263 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
264 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
265 POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
266 POWER_SUPPLY_PROP_TECHNOLOGY,
267 POWER_SUPPLY_PROP_CHARGE_FULL,
268 POWER_SUPPLY_PROP_CHARGE_NOW,
269 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
270 POWER_SUPPLY_PROP_CYCLE_COUNT,
271 POWER_SUPPLY_PROP_ENERGY_NOW,
272 POWER_SUPPLY_PROP_POWER_AVG,
273 POWER_SUPPLY_PROP_HEALTH,
274 POWER_SUPPLY_PROP_MANUFACTURER,
275 };
276
277 static enum power_supply_property bq27010_battery_props[] = {
278 POWER_SUPPLY_PROP_STATUS,
279 POWER_SUPPLY_PROP_PRESENT,
280 POWER_SUPPLY_PROP_VOLTAGE_NOW,
281 POWER_SUPPLY_PROP_CURRENT_NOW,
282 POWER_SUPPLY_PROP_CAPACITY,
283 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
284 POWER_SUPPLY_PROP_TEMP,
285 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
286 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
287 POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
288 POWER_SUPPLY_PROP_TECHNOLOGY,
289 POWER_SUPPLY_PROP_CHARGE_FULL,
290 POWER_SUPPLY_PROP_CHARGE_NOW,
291 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
292 POWER_SUPPLY_PROP_CYCLE_COUNT,
293 POWER_SUPPLY_PROP_HEALTH,
294 POWER_SUPPLY_PROP_MANUFACTURER,
295 };
296
297 static enum power_supply_property bq27500_battery_props[] = {
298 POWER_SUPPLY_PROP_STATUS,
299 POWER_SUPPLY_PROP_PRESENT,
300 POWER_SUPPLY_PROP_VOLTAGE_NOW,
301 POWER_SUPPLY_PROP_CURRENT_NOW,
302 POWER_SUPPLY_PROP_CAPACITY,
303 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
304 POWER_SUPPLY_PROP_TEMP,
305 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
306 POWER_SUPPLY_PROP_TECHNOLOGY,
307 POWER_SUPPLY_PROP_CHARGE_FULL,
308 POWER_SUPPLY_PROP_CHARGE_NOW,
309 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
310 POWER_SUPPLY_PROP_CYCLE_COUNT,
311 POWER_SUPPLY_PROP_HEALTH,
312 POWER_SUPPLY_PROP_MANUFACTURER,
313 };
314
315 static enum power_supply_property bq27530_battery_props[] = {
316 POWER_SUPPLY_PROP_STATUS,
317 POWER_SUPPLY_PROP_PRESENT,
318 POWER_SUPPLY_PROP_VOLTAGE_NOW,
319 POWER_SUPPLY_PROP_CURRENT_NOW,
320 POWER_SUPPLY_PROP_CAPACITY,
321 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
322 POWER_SUPPLY_PROP_TEMP,
323 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
324 POWER_SUPPLY_PROP_TECHNOLOGY,
325 POWER_SUPPLY_PROP_CHARGE_FULL,
326 POWER_SUPPLY_PROP_CHARGE_NOW,
327 POWER_SUPPLY_PROP_POWER_AVG,
328 POWER_SUPPLY_PROP_HEALTH,
329 POWER_SUPPLY_PROP_CYCLE_COUNT,
330 POWER_SUPPLY_PROP_MANUFACTURER,
331 };
332
333 static enum power_supply_property bq27541_battery_props[] = {
334 POWER_SUPPLY_PROP_STATUS,
335 POWER_SUPPLY_PROP_PRESENT,
336 POWER_SUPPLY_PROP_VOLTAGE_NOW,
337 POWER_SUPPLY_PROP_CURRENT_NOW,
338 POWER_SUPPLY_PROP_CAPACITY,
339 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
340 POWER_SUPPLY_PROP_TEMP,
341 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
342 POWER_SUPPLY_PROP_TECHNOLOGY,
343 POWER_SUPPLY_PROP_CHARGE_FULL,
344 POWER_SUPPLY_PROP_CHARGE_NOW,
345 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
346 POWER_SUPPLY_PROP_CYCLE_COUNT,
347 POWER_SUPPLY_PROP_POWER_AVG,
348 POWER_SUPPLY_PROP_HEALTH,
349 POWER_SUPPLY_PROP_MANUFACTURER,
350 };
351
352 static enum power_supply_property bq27545_battery_props[] = {
353 POWER_SUPPLY_PROP_STATUS,
354 POWER_SUPPLY_PROP_PRESENT,
355 POWER_SUPPLY_PROP_VOLTAGE_NOW,
356 POWER_SUPPLY_PROP_CURRENT_NOW,
357 POWER_SUPPLY_PROP_CAPACITY,
358 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
359 POWER_SUPPLY_PROP_TEMP,
360 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
361 POWER_SUPPLY_PROP_TECHNOLOGY,
362 POWER_SUPPLY_PROP_CHARGE_FULL,
363 POWER_SUPPLY_PROP_CHARGE_NOW,
364 POWER_SUPPLY_PROP_HEALTH,
365 POWER_SUPPLY_PROP_CYCLE_COUNT,
366 POWER_SUPPLY_PROP_POWER_AVG,
367 POWER_SUPPLY_PROP_MANUFACTURER,
368 };
369
370 static enum power_supply_property bq27421_battery_props[] = {
371 POWER_SUPPLY_PROP_STATUS,
372 POWER_SUPPLY_PROP_PRESENT,
373 POWER_SUPPLY_PROP_VOLTAGE_NOW,
374 POWER_SUPPLY_PROP_CURRENT_NOW,
375 POWER_SUPPLY_PROP_CAPACITY,
376 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
377 POWER_SUPPLY_PROP_TEMP,
378 POWER_SUPPLY_PROP_TECHNOLOGY,
379 POWER_SUPPLY_PROP_CHARGE_FULL,
380 POWER_SUPPLY_PROP_CHARGE_NOW,
381 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
382 POWER_SUPPLY_PROP_MANUFACTURER,
383 };
384
385 #define BQ27XXX_PROP(_id, _prop) \
386 [_id] = { \
387 .props = _prop, \
388 .size = ARRAY_SIZE(_prop), \
389 }
390
391 static struct {
392 enum power_supply_property *props;
393 size_t size;
394 } bq27xxx_battery_props[] = {
395 BQ27XXX_PROP(BQ27000, bq27000_battery_props),
396 BQ27XXX_PROP(BQ27010, bq27010_battery_props),
397 BQ27XXX_PROP(BQ27500, bq27500_battery_props),
398 BQ27XXX_PROP(BQ27530, bq27530_battery_props),
399 BQ27XXX_PROP(BQ27541, bq27541_battery_props),
400 BQ27XXX_PROP(BQ27545, bq27545_battery_props),
401 BQ27XXX_PROP(BQ27421, bq27421_battery_props),
402 };
403
404 static unsigned int poll_interval = 360;
405 module_param(poll_interval, uint, 0644);
406 MODULE_PARM_DESC(poll_interval,
407 "battery poll interval in seconds - 0 disables polling");
408
409 /*
410 * Common code for BQ27xxx devices
411 */
412
413 static inline int bq27xxx_read(struct bq27xxx_device_info *di, int reg_index,
414 bool single)
415 {
416 /* Reports EINVAL for invalid/missing registers */
417 if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
418 return -EINVAL;
419
420 return di->bus.read(di, di->regs[reg_index], single);
421 }
422
423 /*
424 * Return the battery State-of-Charge
425 * Or < 0 if something fails.
426 */
427 static int bq27xxx_battery_read_soc(struct bq27xxx_device_info *di)
428 {
429 int soc;
430
431 if (di->chip == BQ27000 || di->chip == BQ27010)
432 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, true);
433 else
434 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
435
436 if (soc < 0)
437 dev_dbg(di->dev, "error reading State-of-Charge\n");
438
439 return soc;
440 }
441
442 /*
443 * Return a battery charge value in µAh
444 * Or < 0 if something fails.
445 */
446 static int bq27xxx_battery_read_charge(struct bq27xxx_device_info *di, u8 reg)
447 {
448 int charge;
449
450 charge = bq27xxx_read(di, reg, false);
451 if (charge < 0) {
452 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
453 reg, charge);
454 return charge;
455 }
456
457 if (di->chip == BQ27000 || di->chip == BQ27010)
458 charge *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
459 else
460 charge *= 1000;
461
462 return charge;
463 }
464
465 /*
466 * Return the battery Nominal available capacity in µAh
467 * Or < 0 if something fails.
468 */
469 static inline int bq27xxx_battery_read_nac(struct bq27xxx_device_info *di)
470 {
471 int flags;
472
473 if (di->chip == BQ27000 || di->chip == BQ27010) {
474 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
475 if (flags >= 0 && (flags & BQ27000_FLAG_CI))
476 return -ENODATA;
477 }
478
479 return bq27xxx_battery_read_charge(di, BQ27XXX_REG_NAC);
480 }
481
482 /*
483 * Return the battery Full Charge Capacity in µAh
484 * Or < 0 if something fails.
485 */
486 static inline int bq27xxx_battery_read_fcc(struct bq27xxx_device_info *di)
487 {
488 return bq27xxx_battery_read_charge(di, BQ27XXX_REG_FCC);
489 }
490
491 /*
492 * Return the Design Capacity in µAh
493 * Or < 0 if something fails.
494 */
495 static int bq27xxx_battery_read_dcap(struct bq27xxx_device_info *di)
496 {
497 int dcap;
498
499 if (di->chip == BQ27000 || di->chip == BQ27010)
500 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, true);
501 else
502 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
503
504 if (dcap < 0) {
505 dev_dbg(di->dev, "error reading initial last measured discharge\n");
506 return dcap;
507 }
508
509 if (di->chip == BQ27000 || di->chip == BQ27010)
510 dcap = (dcap << 8) * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
511 else
512 dcap *= 1000;
513
514 return dcap;
515 }
516
517 /*
518 * Return the battery Available energy in µWh
519 * Or < 0 if something fails.
520 */
521 static int bq27xxx_battery_read_energy(struct bq27xxx_device_info *di)
522 {
523 int ae;
524
525 ae = bq27xxx_read(di, BQ27XXX_REG_AE, false);
526 if (ae < 0) {
527 dev_dbg(di->dev, "error reading available energy\n");
528 return ae;
529 }
530
531 if (di->chip == BQ27000 || di->chip == BQ27010)
532 ae *= BQ27XXX_POWER_CONSTANT / BQ27XXX_RS;
533 else
534 ae *= 1000;
535
536 return ae;
537 }
538
539 /*
540 * Return the battery temperature in tenths of degree Kelvin
541 * Or < 0 if something fails.
542 */
543 static int bq27xxx_battery_read_temperature(struct bq27xxx_device_info *di)
544 {
545 int temp;
546
547 temp = bq27xxx_read(di, BQ27XXX_REG_TEMP, false);
548 if (temp < 0) {
549 dev_err(di->dev, "error reading temperature\n");
550 return temp;
551 }
552
553 if (di->chip == BQ27000 || di->chip == BQ27010)
554 temp = 5 * temp / 2;
555
556 return temp;
557 }
558
559 /*
560 * Return the battery Cycle count total
561 * Or < 0 if something fails.
562 */
563 static int bq27xxx_battery_read_cyct(struct bq27xxx_device_info *di)
564 {
565 int cyct;
566
567 cyct = bq27xxx_read(di, BQ27XXX_REG_CYCT, false);
568 if (cyct < 0)
569 dev_err(di->dev, "error reading cycle count total\n");
570
571 return cyct;
572 }
573
574 /*
575 * Read a time register.
576 * Return < 0 if something fails.
577 */
578 static int bq27xxx_battery_read_time(struct bq27xxx_device_info *di, u8 reg)
579 {
580 int tval;
581
582 tval = bq27xxx_read(di, reg, false);
583 if (tval < 0) {
584 dev_dbg(di->dev, "error reading time register %02x: %d\n",
585 reg, tval);
586 return tval;
587 }
588
589 if (tval == 65535)
590 return -ENODATA;
591
592 return tval * 60;
593 }
594
595 /*
596 * Read an average power register.
597 * Return < 0 if something fails.
598 */
599 static int bq27xxx_battery_read_pwr_avg(struct bq27xxx_device_info *di)
600 {
601 int tval;
602
603 tval = bq27xxx_read(di, BQ27XXX_REG_AP, false);
604 if (tval < 0) {
605 dev_err(di->dev, "error reading average power register %02x: %d\n",
606 BQ27XXX_REG_AP, tval);
607 return tval;
608 }
609
610 if (di->chip == BQ27000 || di->chip == BQ27010)
611 return (tval * BQ27XXX_POWER_CONSTANT) / BQ27XXX_RS;
612 else
613 return tval;
614 }
615
616 /*
617 * Returns true if a battery over temperature condition is detected
618 */
619 static bool bq27xxx_battery_overtemp(struct bq27xxx_device_info *di, u16 flags)
620 {
621 if (di->chip == BQ27500 || di->chip == BQ27541 || di->chip == BQ27545)
622 return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD);
623 if (di->chip == BQ27530 || di->chip == BQ27421)
624 return flags & BQ27XXX_FLAG_OT;
625
626 return false;
627 }
628
629 /*
630 * Returns true if a battery under temperature condition is detected
631 */
632 static bool bq27xxx_battery_undertemp(struct bq27xxx_device_info *di, u16 flags)
633 {
634 if (di->chip == BQ27530 || di->chip == BQ27421)
635 return flags & BQ27XXX_FLAG_UT;
636
637 return false;
638 }
639
640 /*
641 * Returns true if a low state of charge condition is detected
642 */
643 static bool bq27xxx_battery_dead(struct bq27xxx_device_info *di, u16 flags)
644 {
645 if (di->chip == BQ27000 || di->chip == BQ27010)
646 return flags & (BQ27000_FLAG_EDV1 | BQ27000_FLAG_EDVF);
647 else
648 return flags & (BQ27XXX_FLAG_SOC1 | BQ27XXX_FLAG_SOCF);
649 }
650
651 /*
652 * Read flag register.
653 * Return < 0 if something fails.
654 */
655 static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di)
656 {
657 int flags;
658
659 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
660 if (flags < 0) {
661 dev_err(di->dev, "error reading flag register:%d\n", flags);
662 return flags;
663 }
664
665 /* Unlikely but important to return first */
666 if (unlikely(bq27xxx_battery_overtemp(di, flags)))
667 return POWER_SUPPLY_HEALTH_OVERHEAT;
668 if (unlikely(bq27xxx_battery_undertemp(di, flags)))
669 return POWER_SUPPLY_HEALTH_COLD;
670 if (unlikely(bq27xxx_battery_dead(di, flags)))
671 return POWER_SUPPLY_HEALTH_DEAD;
672
673 return POWER_SUPPLY_HEALTH_GOOD;
674 }
675
676 void bq27xxx_battery_update(struct bq27xxx_device_info *di)
677 {
678 struct bq27xxx_reg_cache cache = {0, };
679 bool has_ci_flag = di->chip == BQ27000 || di->chip == BQ27010;
680 bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
681
682 cache.flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
683 if ((cache.flags & 0xff) == 0xff)
684 cache.flags = -1; /* read error */
685 if (cache.flags >= 0) {
686 cache.temperature = bq27xxx_battery_read_temperature(di);
687 if (has_ci_flag && (cache.flags & BQ27000_FLAG_CI)) {
688 dev_info_once(di->dev, "battery is not calibrated! ignoring capacity values\n");
689 cache.capacity = -ENODATA;
690 cache.energy = -ENODATA;
691 cache.time_to_empty = -ENODATA;
692 cache.time_to_empty_avg = -ENODATA;
693 cache.time_to_full = -ENODATA;
694 cache.charge_full = -ENODATA;
695 cache.health = -ENODATA;
696 } else {
697 if (di->regs[BQ27XXX_REG_TTE] != INVALID_REG_ADDR)
698 cache.time_to_empty = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTE);
699 if (di->regs[BQ27XXX_REG_TTECP] != INVALID_REG_ADDR)
700 cache.time_to_empty_avg = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTECP);
701 if (di->regs[BQ27XXX_REG_TTF] != INVALID_REG_ADDR)
702 cache.time_to_full = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTF);
703 cache.charge_full = bq27xxx_battery_read_fcc(di);
704 cache.capacity = bq27xxx_battery_read_soc(di);
705 if (di->regs[BQ27XXX_REG_AE] != INVALID_REG_ADDR)
706 cache.energy = bq27xxx_battery_read_energy(di);
707 cache.health = bq27xxx_battery_read_health(di);
708 }
709 if (di->regs[BQ27XXX_REG_CYCT] != INVALID_REG_ADDR)
710 cache.cycle_count = bq27xxx_battery_read_cyct(di);
711 if (di->regs[BQ27XXX_REG_AP] != INVALID_REG_ADDR)
712 cache.power_avg = bq27xxx_battery_read_pwr_avg(di);
713
714 /* We only have to read charge design full once */
715 if (di->charge_design_full <= 0)
716 di->charge_design_full = bq27xxx_battery_read_dcap(di);
717 }
718
719 if (di->cache.capacity != cache.capacity)
720 power_supply_changed(di->bat);
721
722 if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
723 di->cache = cache;
724
725 di->last_update = jiffies;
726 }
727 EXPORT_SYMBOL_GPL(bq27xxx_battery_update);
728
729 static void bq27xxx_battery_poll(struct work_struct *work)
730 {
731 struct bq27xxx_device_info *di =
732 container_of(work, struct bq27xxx_device_info,
733 work.work);
734
735 bq27xxx_battery_update(di);
736
737 if (poll_interval > 0) {
738 /* The timer does not have to be accurate. */
739 set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
740 schedule_delayed_work(&di->work, poll_interval * HZ);
741 }
742 }
743
744 /*
745 * Return the battery average current in µA
746 * Note that current can be negative signed as well
747 * Or 0 if something fails.
748 */
749 static int bq27xxx_battery_current(struct bq27xxx_device_info *di,
750 union power_supply_propval *val)
751 {
752 int curr;
753 int flags;
754
755 curr = bq27xxx_read(di, BQ27XXX_REG_AI, false);
756 if (curr < 0) {
757 dev_err(di->dev, "error reading current\n");
758 return curr;
759 }
760
761 if (di->chip == BQ27000 || di->chip == BQ27010) {
762 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
763 if (flags & BQ27000_FLAG_CHGS) {
764 dev_dbg(di->dev, "negative current!\n");
765 curr = -curr;
766 }
767
768 val->intval = curr * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
769 } else {
770 /* Other gauges return signed value */
771 val->intval = (int)((s16)curr) * 1000;
772 }
773
774 return 0;
775 }
776
777 static int bq27xxx_battery_status(struct bq27xxx_device_info *di,
778 union power_supply_propval *val)
779 {
780 int status;
781
782 if (di->chip == BQ27000 || di->chip == BQ27010) {
783 if (di->cache.flags & BQ27000_FLAG_FC)
784 status = POWER_SUPPLY_STATUS_FULL;
785 else if (di->cache.flags & BQ27000_FLAG_CHGS)
786 status = POWER_SUPPLY_STATUS_CHARGING;
787 else if (power_supply_am_i_supplied(di->bat))
788 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
789 else
790 status = POWER_SUPPLY_STATUS_DISCHARGING;
791 } else {
792 if (di->cache.flags & BQ27XXX_FLAG_FC)
793 status = POWER_SUPPLY_STATUS_FULL;
794 else if (di->cache.flags & BQ27XXX_FLAG_DSC)
795 status = POWER_SUPPLY_STATUS_DISCHARGING;
796 else
797 status = POWER_SUPPLY_STATUS_CHARGING;
798 }
799
800 val->intval = status;
801
802 return 0;
803 }
804
805 static int bq27xxx_battery_capacity_level(struct bq27xxx_device_info *di,
806 union power_supply_propval *val)
807 {
808 int level;
809
810 if (di->chip == BQ27000 || di->chip == BQ27010) {
811 if (di->cache.flags & BQ27000_FLAG_FC)
812 level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
813 else if (di->cache.flags & BQ27000_FLAG_EDV1)
814 level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
815 else if (di->cache.flags & BQ27000_FLAG_EDVF)
816 level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
817 else
818 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
819 } else {
820 if (di->cache.flags & BQ27XXX_FLAG_FC)
821 level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
822 else if (di->cache.flags & BQ27XXX_FLAG_SOC1)
823 level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
824 else if (di->cache.flags & BQ27XXX_FLAG_SOCF)
825 level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
826 else
827 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
828 }
829
830 val->intval = level;
831
832 return 0;
833 }
834
835 /*
836 * Return the battery Voltage in millivolts
837 * Or < 0 if something fails.
838 */
839 static int bq27xxx_battery_voltage(struct bq27xxx_device_info *di,
840 union power_supply_propval *val)
841 {
842 int volt;
843
844 volt = bq27xxx_read(di, BQ27XXX_REG_VOLT, false);
845 if (volt < 0) {
846 dev_err(di->dev, "error reading voltage\n");
847 return volt;
848 }
849
850 val->intval = volt * 1000;
851
852 return 0;
853 }
854
855 static int bq27xxx_simple_value(int value,
856 union power_supply_propval *val)
857 {
858 if (value < 0)
859 return value;
860
861 val->intval = value;
862
863 return 0;
864 }
865
866 static int bq27xxx_battery_get_property(struct power_supply *psy,
867 enum power_supply_property psp,
868 union power_supply_propval *val)
869 {
870 int ret = 0;
871 struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
872
873 mutex_lock(&di->lock);
874 if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
875 cancel_delayed_work_sync(&di->work);
876 bq27xxx_battery_poll(&di->work.work);
877 }
878 mutex_unlock(&di->lock);
879
880 if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
881 return -ENODEV;
882
883 switch (psp) {
884 case POWER_SUPPLY_PROP_STATUS:
885 ret = bq27xxx_battery_status(di, val);
886 break;
887 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
888 ret = bq27xxx_battery_voltage(di, val);
889 break;
890 case POWER_SUPPLY_PROP_PRESENT:
891 val->intval = di->cache.flags < 0 ? 0 : 1;
892 break;
893 case POWER_SUPPLY_PROP_CURRENT_NOW:
894 ret = bq27xxx_battery_current(di, val);
895 break;
896 case POWER_SUPPLY_PROP_CAPACITY:
897 ret = bq27xxx_simple_value(di->cache.capacity, val);
898 break;
899 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
900 ret = bq27xxx_battery_capacity_level(di, val);
901 break;
902 case POWER_SUPPLY_PROP_TEMP:
903 ret = bq27xxx_simple_value(di->cache.temperature, val);
904 if (ret == 0)
905 val->intval -= 2731; /* convert decidegree k to c */
906 break;
907 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
908 ret = bq27xxx_simple_value(di->cache.time_to_empty, val);
909 break;
910 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
911 ret = bq27xxx_simple_value(di->cache.time_to_empty_avg, val);
912 break;
913 case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
914 ret = bq27xxx_simple_value(di->cache.time_to_full, val);
915 break;
916 case POWER_SUPPLY_PROP_TECHNOLOGY:
917 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
918 break;
919 case POWER_SUPPLY_PROP_CHARGE_NOW:
920 ret = bq27xxx_simple_value(bq27xxx_battery_read_nac(di), val);
921 break;
922 case POWER_SUPPLY_PROP_CHARGE_FULL:
923 ret = bq27xxx_simple_value(di->cache.charge_full, val);
924 break;
925 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
926 ret = bq27xxx_simple_value(di->charge_design_full, val);
927 break;
928 case POWER_SUPPLY_PROP_CYCLE_COUNT:
929 ret = bq27xxx_simple_value(di->cache.cycle_count, val);
930 break;
931 case POWER_SUPPLY_PROP_ENERGY_NOW:
932 ret = bq27xxx_simple_value(di->cache.energy, val);
933 break;
934 case POWER_SUPPLY_PROP_POWER_AVG:
935 ret = bq27xxx_simple_value(di->cache.power_avg, val);
936 break;
937 case POWER_SUPPLY_PROP_HEALTH:
938 ret = bq27xxx_simple_value(di->cache.health, val);
939 break;
940 case POWER_SUPPLY_PROP_MANUFACTURER:
941 val->strval = BQ27XXX_MANUFACTURER;
942 break;
943 default:
944 return -EINVAL;
945 }
946
947 return ret;
948 }
949
950 static void bq27xxx_external_power_changed(struct power_supply *psy)
951 {
952 struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
953
954 cancel_delayed_work_sync(&di->work);
955 schedule_delayed_work(&di->work, 0);
956 }
957
958 int bq27xxx_battery_setup(struct bq27xxx_device_info *di)
959 {
960 struct power_supply_desc *psy_desc;
961 struct power_supply_config psy_cfg = { .drv_data = di, };
962
963 INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
964 mutex_init(&di->lock);
965 di->regs = bq27xxx_regs[di->chip];
966
967 psy_desc = devm_kzalloc(di->dev, sizeof(*psy_desc), GFP_KERNEL);
968 if (!psy_desc)
969 return -ENOMEM;
970
971 psy_desc->name = di->name;
972 psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
973 psy_desc->properties = bq27xxx_battery_props[di->chip].props;
974 psy_desc->num_properties = bq27xxx_battery_props[di->chip].size;
975 psy_desc->get_property = bq27xxx_battery_get_property;
976 psy_desc->external_power_changed = bq27xxx_external_power_changed;
977
978 di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
979 if (IS_ERR(di->bat)) {
980 dev_err(di->dev, "failed to register battery\n");
981 return PTR_ERR(di->bat);
982 }
983
984 dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
985
986 bq27xxx_battery_update(di);
987
988 return 0;
989 }
990 EXPORT_SYMBOL_GPL(bq27xxx_battery_setup);
991
992 void bq27xxx_battery_teardown(struct bq27xxx_device_info *di)
993 {
994 /*
995 * power_supply_unregister call bq27xxx_battery_get_property which
996 * call bq27xxx_battery_poll.
997 * Make sure that bq27xxx_battery_poll will not call
998 * schedule_delayed_work again after unregister (which cause OOPS).
999 */
1000 poll_interval = 0;
1001
1002 cancel_delayed_work_sync(&di->work);
1003
1004 power_supply_unregister(di->bat);
1005
1006 mutex_destroy(&di->lock);
1007 }
1008 EXPORT_SYMBOL_GPL(bq27xxx_battery_teardown);
1009
1010 static int bq27xxx_battery_platform_read(struct bq27xxx_device_info *di, u8 reg,
1011 bool single)
1012 {
1013 struct device *dev = di->dev;
1014 struct bq27xxx_platform_data *pdata = dev->platform_data;
1015 unsigned int timeout = 3;
1016 int upper, lower;
1017 int temp;
1018
1019 if (!single) {
1020 /* Make sure the value has not changed in between reading the
1021 * lower and the upper part */
1022 upper = pdata->read(dev, reg + 1);
1023 do {
1024 temp = upper;
1025 if (upper < 0)
1026 return upper;
1027
1028 lower = pdata->read(dev, reg);
1029 if (lower < 0)
1030 return lower;
1031
1032 upper = pdata->read(dev, reg + 1);
1033 } while (temp != upper && --timeout);
1034
1035 if (timeout == 0)
1036 return -EIO;
1037
1038 return (upper << 8) | lower;
1039 }
1040
1041 return pdata->read(dev, reg);
1042 }
1043
1044 static int bq27xxx_battery_platform_probe(struct platform_device *pdev)
1045 {
1046 struct bq27xxx_device_info *di;
1047 struct bq27xxx_platform_data *pdata = pdev->dev.platform_data;
1048
1049 if (!pdata) {
1050 dev_err(&pdev->dev, "no platform_data supplied\n");
1051 return -EINVAL;
1052 }
1053
1054 if (!pdata->read) {
1055 dev_err(&pdev->dev, "no hdq read callback supplied\n");
1056 return -EINVAL;
1057 }
1058
1059 if (!pdata->chip) {
1060 dev_err(&pdev->dev, "no device supplied\n");
1061 return -EINVAL;
1062 }
1063
1064 di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1065 if (!di)
1066 return -ENOMEM;
1067
1068 platform_set_drvdata(pdev, di);
1069
1070 di->dev = &pdev->dev;
1071 di->chip = pdata->chip;
1072 di->name = pdata->name ?: dev_name(&pdev->dev);
1073 di->bus.read = bq27xxx_battery_platform_read;
1074
1075 return bq27xxx_battery_setup(di);
1076 }
1077
1078 static int bq27xxx_battery_platform_remove(struct platform_device *pdev)
1079 {
1080 struct bq27xxx_device_info *di = platform_get_drvdata(pdev);
1081
1082 bq27xxx_battery_teardown(di);
1083
1084 return 0;
1085 }
1086
1087 static const struct platform_device_id bq27xxx_battery_platform_id_table[] = {
1088 { "bq27000-battery", },
1089 { /* sentinel */ }
1090 };
1091 MODULE_DEVICE_TABLE(platform, bq27xxx_battery_platform_id_table);
1092
1093 static struct platform_driver bq27xxx_battery_platform_driver = {
1094 .probe = bq27xxx_battery_platform_probe,
1095 .remove = bq27xxx_battery_platform_remove,
1096 .driver = {
1097 .name = "bq27000-battery",
1098 },
1099 .id_table = bq27xxx_battery_platform_id_table,
1100 };
1101 module_platform_driver(bq27xxx_battery_platform_driver);
1102
1103 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1104 MODULE_DESCRIPTION("BQ27xxx battery monitor driver");
1105 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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