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Merge branch 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[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 #include <linux/of.h>
50
51 #include <linux/power/bq27xxx_battery.h>
52
53 #define DRIVER_VERSION "1.2.0"
54
55 #define BQ27XXX_MANUFACTURER "Texas Instruments"
56
57 /* BQ27XXX Flags */
58 #define BQ27XXX_FLAG_DSC BIT(0)
59 #define BQ27XXX_FLAG_SOCF BIT(1) /* State-of-Charge threshold final */
60 #define BQ27XXX_FLAG_SOC1 BIT(2) /* State-of-Charge threshold 1 */
61 #define BQ27XXX_FLAG_FC BIT(9)
62 #define BQ27XXX_FLAG_OTD BIT(14)
63 #define BQ27XXX_FLAG_OTC BIT(15)
64 #define BQ27XXX_FLAG_UT BIT(14)
65 #define BQ27XXX_FLAG_OT BIT(15)
66
67 /* BQ27000 has different layout for Flags register */
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
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 */
77
78 #define INVALID_REG_ADDR 0xff
79
80 /*
81 * bq27xxx_reg_index - Register names
82 *
83 * These are indexes into a device's register mapping array.
84 */
85 enum bq27xxx_reg_index {
86 BQ27XXX_REG_CTRL = 0, /* Control */
87 BQ27XXX_REG_TEMP, /* Temperature */
88 BQ27XXX_REG_INT_TEMP, /* Internal Temperature */
89 BQ27XXX_REG_VOLT, /* Voltage */
90 BQ27XXX_REG_AI, /* Average Current */
91 BQ27XXX_REG_FLAGS, /* Flags */
92 BQ27XXX_REG_TTE, /* Time-to-Empty */
93 BQ27XXX_REG_TTF, /* Time-to-Full */
94 BQ27XXX_REG_TTES, /* Time-to-Empty Standby */
95 BQ27XXX_REG_TTECP, /* Time-to-Empty at Constant Power */
96 BQ27XXX_REG_NAC, /* Nominal Available Capacity */
97 BQ27XXX_REG_FCC, /* Full Charge Capacity */
98 BQ27XXX_REG_CYCT, /* Cycle Count */
99 BQ27XXX_REG_AE, /* Available Energy */
100 BQ27XXX_REG_SOC, /* State-of-Charge */
101 BQ27XXX_REG_DCAP, /* Design Capacity */
102 BQ27XXX_REG_AP, /* Average Power */
103 };
104
105 /* Register mappings */
106 static u8 bq27000_regs[] = {
107 0x00, /* CONTROL */
108 0x06, /* TEMP */
109 INVALID_REG_ADDR, /* INT TEMP - NA*/
110 0x08, /* VOLT */
111 0x14, /* AVG CURR */
112 0x0a, /* FLAGS */
113 0x16, /* TTE */
114 0x18, /* TTF */
115 0x1c, /* TTES */
116 0x26, /* TTECP */
117 0x0c, /* NAC */
118 0x12, /* LMD(FCC) */
119 0x2a, /* CYCT */
120 0x22, /* AE */
121 0x0b, /* SOC(RSOC) */
122 0x76, /* DCAP(ILMD) */
123 0x24, /* AP */
124 };
125
126 static u8 bq27010_regs[] = {
127 0x00, /* CONTROL */
128 0x06, /* TEMP */
129 INVALID_REG_ADDR, /* INT TEMP - NA*/
130 0x08, /* VOLT */
131 0x14, /* AVG CURR */
132 0x0a, /* FLAGS */
133 0x16, /* TTE */
134 0x18, /* TTF */
135 0x1c, /* TTES */
136 0x26, /* TTECP */
137 0x0c, /* NAC */
138 0x12, /* LMD(FCC) */
139 0x2a, /* CYCT */
140 INVALID_REG_ADDR, /* AE - NA */
141 0x0b, /* SOC(RSOC) */
142 0x76, /* DCAP(ILMD) */
143 INVALID_REG_ADDR, /* AP - NA */
144 };
145
146 static u8 bq27500_regs[] = {
147 0x00, /* CONTROL */
148 0x06, /* TEMP */
149 0x28, /* INT TEMP */
150 0x08, /* VOLT */
151 0x14, /* AVG CURR */
152 0x0a, /* FLAGS */
153 0x16, /* TTE */
154 INVALID_REG_ADDR, /* TTF - NA */
155 0x1a, /* TTES */
156 INVALID_REG_ADDR, /* TTECP - NA */
157 0x0c, /* NAC */
158 0x12, /* LMD(FCC) */
159 0x2a, /* CYCT */
160 INVALID_REG_ADDR, /* AE - NA */
161 0x2c, /* SOC(RSOC) */
162 0x3c, /* DCAP(ILMD) */
163 INVALID_REG_ADDR, /* AP - NA */
164 };
165
166 static u8 bq27530_regs[] = {
167 0x00, /* CONTROL */
168 0x06, /* TEMP */
169 0x32, /* INT TEMP */
170 0x08, /* VOLT */
171 0x14, /* AVG CURR */
172 0x0a, /* FLAGS */
173 0x16, /* TTE */
174 INVALID_REG_ADDR, /* TTF - NA */
175 INVALID_REG_ADDR, /* TTES - NA */
176 INVALID_REG_ADDR, /* TTECP - NA */
177 0x0c, /* NAC */
178 0x12, /* LMD(FCC) */
179 0x2a, /* CYCT */
180 INVALID_REG_ADDR, /* AE - NA */
181 0x2c, /* SOC(RSOC) */
182 INVALID_REG_ADDR, /* DCAP - NA */
183 0x24, /* AP */
184 };
185
186 static u8 bq27541_regs[] = {
187 0x00, /* CONTROL */
188 0x06, /* TEMP */
189 0x28, /* INT TEMP */
190 0x08, /* VOLT */
191 0x14, /* AVG CURR */
192 0x0a, /* FLAGS */
193 0x16, /* TTE */
194 INVALID_REG_ADDR, /* TTF - NA */
195 INVALID_REG_ADDR, /* TTES - NA */
196 INVALID_REG_ADDR, /* TTECP - NA */
197 0x0c, /* NAC */
198 0x12, /* LMD(FCC) */
199 0x2a, /* CYCT */
200 INVALID_REG_ADDR, /* AE - NA */
201 0x2c, /* SOC(RSOC) */
202 0x3c, /* DCAP */
203 0x24, /* AP */
204 };
205
206 static u8 bq27545_regs[] = {
207 0x00, /* CONTROL */
208 0x06, /* TEMP */
209 0x28, /* INT TEMP */
210 0x08, /* VOLT */
211 0x14, /* AVG CURR */
212 0x0a, /* FLAGS */
213 0x16, /* TTE */
214 INVALID_REG_ADDR, /* TTF - NA */
215 INVALID_REG_ADDR, /* TTES - NA */
216 INVALID_REG_ADDR, /* TTECP - NA */
217 0x0c, /* NAC */
218 0x12, /* LMD(FCC) */
219 0x2a, /* CYCT */
220 INVALID_REG_ADDR, /* AE - NA */
221 0x2c, /* SOC(RSOC) */
222 INVALID_REG_ADDR, /* DCAP - NA */
223 0x24, /* AP */
224 };
225
226 static u8 bq27421_regs[] = {
227 0x00, /* CONTROL */
228 0x02, /* TEMP */
229 0x1e, /* INT TEMP */
230 0x04, /* VOLT */
231 0x10, /* AVG CURR */
232 0x06, /* FLAGS */
233 INVALID_REG_ADDR, /* TTE - NA */
234 INVALID_REG_ADDR, /* TTF - NA */
235 INVALID_REG_ADDR, /* TTES - NA */
236 INVALID_REG_ADDR, /* TTECP - NA */
237 0x08, /* NAC */
238 0x0e, /* FCC */
239 INVALID_REG_ADDR, /* CYCT - NA */
240 INVALID_REG_ADDR, /* AE - NA */
241 0x1c, /* SOC */
242 0x3c, /* DCAP */
243 0x18, /* AP */
244 };
245
246 static u8 *bq27xxx_regs[] = {
247 [BQ27000] = bq27000_regs,
248 [BQ27010] = bq27010_regs,
249 [BQ27500] = bq27500_regs,
250 [BQ27530] = bq27530_regs,
251 [BQ27541] = bq27541_regs,
252 [BQ27545] = bq27545_regs,
253 [BQ27421] = bq27421_regs,
254 };
255
256 static enum power_supply_property bq27000_battery_props[] = {
257 POWER_SUPPLY_PROP_STATUS,
258 POWER_SUPPLY_PROP_PRESENT,
259 POWER_SUPPLY_PROP_VOLTAGE_NOW,
260 POWER_SUPPLY_PROP_CURRENT_NOW,
261 POWER_SUPPLY_PROP_CAPACITY,
262 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
263 POWER_SUPPLY_PROP_TEMP,
264 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
265 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
266 POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
267 POWER_SUPPLY_PROP_TECHNOLOGY,
268 POWER_SUPPLY_PROP_CHARGE_FULL,
269 POWER_SUPPLY_PROP_CHARGE_NOW,
270 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
271 POWER_SUPPLY_PROP_CYCLE_COUNT,
272 POWER_SUPPLY_PROP_ENERGY_NOW,
273 POWER_SUPPLY_PROP_POWER_AVG,
274 POWER_SUPPLY_PROP_HEALTH,
275 POWER_SUPPLY_PROP_MANUFACTURER,
276 };
277
278 static enum power_supply_property bq27010_battery_props[] = {
279 POWER_SUPPLY_PROP_STATUS,
280 POWER_SUPPLY_PROP_PRESENT,
281 POWER_SUPPLY_PROP_VOLTAGE_NOW,
282 POWER_SUPPLY_PROP_CURRENT_NOW,
283 POWER_SUPPLY_PROP_CAPACITY,
284 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
285 POWER_SUPPLY_PROP_TEMP,
286 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
287 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
288 POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
289 POWER_SUPPLY_PROP_TECHNOLOGY,
290 POWER_SUPPLY_PROP_CHARGE_FULL,
291 POWER_SUPPLY_PROP_CHARGE_NOW,
292 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
293 POWER_SUPPLY_PROP_CYCLE_COUNT,
294 POWER_SUPPLY_PROP_HEALTH,
295 POWER_SUPPLY_PROP_MANUFACTURER,
296 };
297
298 static enum power_supply_property bq27500_battery_props[] = {
299 POWER_SUPPLY_PROP_STATUS,
300 POWER_SUPPLY_PROP_PRESENT,
301 POWER_SUPPLY_PROP_VOLTAGE_NOW,
302 POWER_SUPPLY_PROP_CURRENT_NOW,
303 POWER_SUPPLY_PROP_CAPACITY,
304 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
305 POWER_SUPPLY_PROP_TEMP,
306 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
307 POWER_SUPPLY_PROP_TECHNOLOGY,
308 POWER_SUPPLY_PROP_CHARGE_FULL,
309 POWER_SUPPLY_PROP_CHARGE_NOW,
310 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
311 POWER_SUPPLY_PROP_CYCLE_COUNT,
312 POWER_SUPPLY_PROP_HEALTH,
313 POWER_SUPPLY_PROP_MANUFACTURER,
314 };
315
316 static enum power_supply_property bq27530_battery_props[] = {
317 POWER_SUPPLY_PROP_STATUS,
318 POWER_SUPPLY_PROP_PRESENT,
319 POWER_SUPPLY_PROP_VOLTAGE_NOW,
320 POWER_SUPPLY_PROP_CURRENT_NOW,
321 POWER_SUPPLY_PROP_CAPACITY,
322 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
323 POWER_SUPPLY_PROP_TEMP,
324 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
325 POWER_SUPPLY_PROP_TECHNOLOGY,
326 POWER_SUPPLY_PROP_CHARGE_FULL,
327 POWER_SUPPLY_PROP_CHARGE_NOW,
328 POWER_SUPPLY_PROP_POWER_AVG,
329 POWER_SUPPLY_PROP_HEALTH,
330 POWER_SUPPLY_PROP_CYCLE_COUNT,
331 POWER_SUPPLY_PROP_MANUFACTURER,
332 };
333
334 static enum power_supply_property bq27541_battery_props[] = {
335 POWER_SUPPLY_PROP_STATUS,
336 POWER_SUPPLY_PROP_PRESENT,
337 POWER_SUPPLY_PROP_VOLTAGE_NOW,
338 POWER_SUPPLY_PROP_CURRENT_NOW,
339 POWER_SUPPLY_PROP_CAPACITY,
340 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
341 POWER_SUPPLY_PROP_TEMP,
342 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
343 POWER_SUPPLY_PROP_TECHNOLOGY,
344 POWER_SUPPLY_PROP_CHARGE_FULL,
345 POWER_SUPPLY_PROP_CHARGE_NOW,
346 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
347 POWER_SUPPLY_PROP_CYCLE_COUNT,
348 POWER_SUPPLY_PROP_POWER_AVG,
349 POWER_SUPPLY_PROP_HEALTH,
350 POWER_SUPPLY_PROP_MANUFACTURER,
351 };
352
353 static enum power_supply_property bq27545_battery_props[] = {
354 POWER_SUPPLY_PROP_STATUS,
355 POWER_SUPPLY_PROP_PRESENT,
356 POWER_SUPPLY_PROP_VOLTAGE_NOW,
357 POWER_SUPPLY_PROP_CURRENT_NOW,
358 POWER_SUPPLY_PROP_CAPACITY,
359 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
360 POWER_SUPPLY_PROP_TEMP,
361 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
362 POWER_SUPPLY_PROP_TECHNOLOGY,
363 POWER_SUPPLY_PROP_CHARGE_FULL,
364 POWER_SUPPLY_PROP_CHARGE_NOW,
365 POWER_SUPPLY_PROP_HEALTH,
366 POWER_SUPPLY_PROP_CYCLE_COUNT,
367 POWER_SUPPLY_PROP_POWER_AVG,
368 POWER_SUPPLY_PROP_MANUFACTURER,
369 };
370
371 static enum power_supply_property bq27421_battery_props[] = {
372 POWER_SUPPLY_PROP_STATUS,
373 POWER_SUPPLY_PROP_PRESENT,
374 POWER_SUPPLY_PROP_VOLTAGE_NOW,
375 POWER_SUPPLY_PROP_CURRENT_NOW,
376 POWER_SUPPLY_PROP_CAPACITY,
377 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
378 POWER_SUPPLY_PROP_TEMP,
379 POWER_SUPPLY_PROP_TECHNOLOGY,
380 POWER_SUPPLY_PROP_CHARGE_FULL,
381 POWER_SUPPLY_PROP_CHARGE_NOW,
382 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
383 POWER_SUPPLY_PROP_MANUFACTURER,
384 };
385
386 #define BQ27XXX_PROP(_id, _prop) \
387 [_id] = { \
388 .props = _prop, \
389 .size = ARRAY_SIZE(_prop), \
390 }
391
392 static struct {
393 enum power_supply_property *props;
394 size_t size;
395 } bq27xxx_battery_props[] = {
396 BQ27XXX_PROP(BQ27000, bq27000_battery_props),
397 BQ27XXX_PROP(BQ27010, bq27010_battery_props),
398 BQ27XXX_PROP(BQ27500, bq27500_battery_props),
399 BQ27XXX_PROP(BQ27530, bq27530_battery_props),
400 BQ27XXX_PROP(BQ27541, bq27541_battery_props),
401 BQ27XXX_PROP(BQ27545, bq27545_battery_props),
402 BQ27XXX_PROP(BQ27421, bq27421_battery_props),
403 };
404
405 static unsigned int poll_interval = 360;
406 module_param(poll_interval, uint, 0644);
407 MODULE_PARM_DESC(poll_interval,
408 "battery poll interval in seconds - 0 disables polling");
409
410 /*
411 * Common code for BQ27xxx devices
412 */
413
414 static inline int bq27xxx_read(struct bq27xxx_device_info *di, int reg_index,
415 bool single)
416 {
417 /* Reports EINVAL for invalid/missing registers */
418 if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
419 return -EINVAL;
420
421 return di->bus.read(di, di->regs[reg_index], single);
422 }
423
424 /*
425 * Return the battery State-of-Charge
426 * Or < 0 if something fails.
427 */
428 static int bq27xxx_battery_read_soc(struct bq27xxx_device_info *di)
429 {
430 int soc;
431
432 if (di->chip == BQ27000 || di->chip == BQ27010)
433 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, true);
434 else
435 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
436
437 if (soc < 0)
438 dev_dbg(di->dev, "error reading State-of-Charge\n");
439
440 return soc;
441 }
442
443 /*
444 * Return a battery charge value in µAh
445 * Or < 0 if something fails.
446 */
447 static int bq27xxx_battery_read_charge(struct bq27xxx_device_info *di, u8 reg)
448 {
449 int charge;
450
451 charge = bq27xxx_read(di, reg, false);
452 if (charge < 0) {
453 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
454 reg, charge);
455 return charge;
456 }
457
458 if (di->chip == BQ27000 || di->chip == BQ27010)
459 charge *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
460 else
461 charge *= 1000;
462
463 return charge;
464 }
465
466 /*
467 * Return the battery Nominal available capacity in µAh
468 * Or < 0 if something fails.
469 */
470 static inline int bq27xxx_battery_read_nac(struct bq27xxx_device_info *di)
471 {
472 int flags;
473
474 if (di->chip == BQ27000 || di->chip == BQ27010) {
475 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
476 if (flags >= 0 && (flags & BQ27000_FLAG_CI))
477 return -ENODATA;
478 }
479
480 return bq27xxx_battery_read_charge(di, BQ27XXX_REG_NAC);
481 }
482
483 /*
484 * Return the battery Full Charge Capacity in µAh
485 * Or < 0 if something fails.
486 */
487 static inline int bq27xxx_battery_read_fcc(struct bq27xxx_device_info *di)
488 {
489 return bq27xxx_battery_read_charge(di, BQ27XXX_REG_FCC);
490 }
491
492 /*
493 * Return the Design Capacity in µAh
494 * Or < 0 if something fails.
495 */
496 static int bq27xxx_battery_read_dcap(struct bq27xxx_device_info *di)
497 {
498 int dcap;
499
500 if (di->chip == BQ27000 || di->chip == BQ27010)
501 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, true);
502 else
503 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
504
505 if (dcap < 0) {
506 dev_dbg(di->dev, "error reading initial last measured discharge\n");
507 return dcap;
508 }
509
510 if (di->chip == BQ27000 || di->chip == BQ27010)
511 dcap = (dcap << 8) * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
512 else
513 dcap *= 1000;
514
515 return dcap;
516 }
517
518 /*
519 * Return the battery Available energy in µWh
520 * Or < 0 if something fails.
521 */
522 static int bq27xxx_battery_read_energy(struct bq27xxx_device_info *di)
523 {
524 int ae;
525
526 ae = bq27xxx_read(di, BQ27XXX_REG_AE, false);
527 if (ae < 0) {
528 dev_dbg(di->dev, "error reading available energy\n");
529 return ae;
530 }
531
532 if (di->chip == BQ27000 || di->chip == BQ27010)
533 ae *= BQ27XXX_POWER_CONSTANT / BQ27XXX_RS;
534 else
535 ae *= 1000;
536
537 return ae;
538 }
539
540 /*
541 * Return the battery temperature in tenths of degree Kelvin
542 * Or < 0 if something fails.
543 */
544 static int bq27xxx_battery_read_temperature(struct bq27xxx_device_info *di)
545 {
546 int temp;
547
548 temp = bq27xxx_read(di, BQ27XXX_REG_TEMP, false);
549 if (temp < 0) {
550 dev_err(di->dev, "error reading temperature\n");
551 return temp;
552 }
553
554 if (di->chip == BQ27000 || di->chip == BQ27010)
555 temp = 5 * temp / 2;
556
557 return temp;
558 }
559
560 /*
561 * Return the battery Cycle count total
562 * Or < 0 if something fails.
563 */
564 static int bq27xxx_battery_read_cyct(struct bq27xxx_device_info *di)
565 {
566 int cyct;
567
568 cyct = bq27xxx_read(di, BQ27XXX_REG_CYCT, false);
569 if (cyct < 0)
570 dev_err(di->dev, "error reading cycle count total\n");
571
572 return cyct;
573 }
574
575 /*
576 * Read a time register.
577 * Return < 0 if something fails.
578 */
579 static int bq27xxx_battery_read_time(struct bq27xxx_device_info *di, u8 reg)
580 {
581 int tval;
582
583 tval = bq27xxx_read(di, reg, false);
584 if (tval < 0) {
585 dev_dbg(di->dev, "error reading time register %02x: %d\n",
586 reg, tval);
587 return tval;
588 }
589
590 if (tval == 65535)
591 return -ENODATA;
592
593 return tval * 60;
594 }
595
596 /*
597 * Read an average power register.
598 * Return < 0 if something fails.
599 */
600 static int bq27xxx_battery_read_pwr_avg(struct bq27xxx_device_info *di)
601 {
602 int tval;
603
604 tval = bq27xxx_read(di, BQ27XXX_REG_AP, false);
605 if (tval < 0) {
606 dev_err(di->dev, "error reading average power register %02x: %d\n",
607 BQ27XXX_REG_AP, tval);
608 return tval;
609 }
610
611 if (di->chip == BQ27000 || di->chip == BQ27010)
612 return (tval * BQ27XXX_POWER_CONSTANT) / BQ27XXX_RS;
613 else
614 return tval;
615 }
616
617 /*
618 * Returns true if a battery over temperature condition is detected
619 */
620 static bool bq27xxx_battery_overtemp(struct bq27xxx_device_info *di, u16 flags)
621 {
622 if (di->chip == BQ27500 || di->chip == BQ27541 || di->chip == BQ27545)
623 return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD);
624 if (di->chip == BQ27530 || di->chip == BQ27421)
625 return flags & BQ27XXX_FLAG_OT;
626
627 return false;
628 }
629
630 /*
631 * Returns true if a battery under temperature condition is detected
632 */
633 static bool bq27xxx_battery_undertemp(struct bq27xxx_device_info *di, u16 flags)
634 {
635 if (di->chip == BQ27530 || di->chip == BQ27421)
636 return flags & BQ27XXX_FLAG_UT;
637
638 return false;
639 }
640
641 /*
642 * Returns true if a low state of charge condition is detected
643 */
644 static bool bq27xxx_battery_dead(struct bq27xxx_device_info *di, u16 flags)
645 {
646 if (di->chip == BQ27000 || di->chip == BQ27010)
647 return flags & (BQ27000_FLAG_EDV1 | BQ27000_FLAG_EDVF);
648 else
649 return flags & (BQ27XXX_FLAG_SOC1 | BQ27XXX_FLAG_SOCF);
650 }
651
652 /*
653 * Read flag register.
654 * Return < 0 if something fails.
655 */
656 static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di)
657 {
658 int flags;
659
660 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
661 if (flags < 0) {
662 dev_err(di->dev, "error reading flag register:%d\n", flags);
663 return flags;
664 }
665
666 /* Unlikely but important to return first */
667 if (unlikely(bq27xxx_battery_overtemp(di, flags)))
668 return POWER_SUPPLY_HEALTH_OVERHEAT;
669 if (unlikely(bq27xxx_battery_undertemp(di, flags)))
670 return POWER_SUPPLY_HEALTH_COLD;
671 if (unlikely(bq27xxx_battery_dead(di, flags)))
672 return POWER_SUPPLY_HEALTH_DEAD;
673
674 return POWER_SUPPLY_HEALTH_GOOD;
675 }
676
677 void bq27xxx_battery_update(struct bq27xxx_device_info *di)
678 {
679 struct bq27xxx_reg_cache cache = {0, };
680 bool has_ci_flag = di->chip == BQ27000 || di->chip == BQ27010;
681 bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
682
683 cache.flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
684 if ((cache.flags & 0xff) == 0xff)
685 cache.flags = -1; /* read error */
686 if (cache.flags >= 0) {
687 cache.temperature = bq27xxx_battery_read_temperature(di);
688 if (has_ci_flag && (cache.flags & BQ27000_FLAG_CI)) {
689 dev_info_once(di->dev, "battery is not calibrated! ignoring capacity values\n");
690 cache.capacity = -ENODATA;
691 cache.energy = -ENODATA;
692 cache.time_to_empty = -ENODATA;
693 cache.time_to_empty_avg = -ENODATA;
694 cache.time_to_full = -ENODATA;
695 cache.charge_full = -ENODATA;
696 cache.health = -ENODATA;
697 } else {
698 if (di->regs[BQ27XXX_REG_TTE] != INVALID_REG_ADDR)
699 cache.time_to_empty = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTE);
700 if (di->regs[BQ27XXX_REG_TTECP] != INVALID_REG_ADDR)
701 cache.time_to_empty_avg = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTECP);
702 if (di->regs[BQ27XXX_REG_TTF] != INVALID_REG_ADDR)
703 cache.time_to_full = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTF);
704 cache.charge_full = bq27xxx_battery_read_fcc(di);
705 cache.capacity = bq27xxx_battery_read_soc(di);
706 if (di->regs[BQ27XXX_REG_AE] != INVALID_REG_ADDR)
707 cache.energy = bq27xxx_battery_read_energy(di);
708 cache.health = bq27xxx_battery_read_health(di);
709 }
710 if (di->regs[BQ27XXX_REG_CYCT] != INVALID_REG_ADDR)
711 cache.cycle_count = bq27xxx_battery_read_cyct(di);
712 if (di->regs[BQ27XXX_REG_AP] != INVALID_REG_ADDR)
713 cache.power_avg = bq27xxx_battery_read_pwr_avg(di);
714
715 /* We only have to read charge design full once */
716 if (di->charge_design_full <= 0)
717 di->charge_design_full = bq27xxx_battery_read_dcap(di);
718 }
719
720 if (di->cache.capacity != cache.capacity)
721 power_supply_changed(di->bat);
722
723 if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
724 di->cache = cache;
725
726 di->last_update = jiffies;
727 }
728 EXPORT_SYMBOL_GPL(bq27xxx_battery_update);
729
730 static void bq27xxx_battery_poll(struct work_struct *work)
731 {
732 struct bq27xxx_device_info *di =
733 container_of(work, struct bq27xxx_device_info,
734 work.work);
735
736 bq27xxx_battery_update(di);
737
738 if (poll_interval > 0) {
739 /* The timer does not have to be accurate. */
740 set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
741 schedule_delayed_work(&di->work, poll_interval * HZ);
742 }
743 }
744
745 /*
746 * Return the battery average current in µA
747 * Note that current can be negative signed as well
748 * Or 0 if something fails.
749 */
750 static int bq27xxx_battery_current(struct bq27xxx_device_info *di,
751 union power_supply_propval *val)
752 {
753 int curr;
754 int flags;
755
756 curr = bq27xxx_read(di, BQ27XXX_REG_AI, false);
757 if (curr < 0) {
758 dev_err(di->dev, "error reading current\n");
759 return curr;
760 }
761
762 if (di->chip == BQ27000 || di->chip == BQ27010) {
763 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
764 if (flags & BQ27000_FLAG_CHGS) {
765 dev_dbg(di->dev, "negative current!\n");
766 curr = -curr;
767 }
768
769 val->intval = curr * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
770 } else {
771 /* Other gauges return signed value */
772 val->intval = (int)((s16)curr) * 1000;
773 }
774
775 return 0;
776 }
777
778 static int bq27xxx_battery_status(struct bq27xxx_device_info *di,
779 union power_supply_propval *val)
780 {
781 int status;
782
783 if (di->chip == BQ27000 || di->chip == BQ27010) {
784 if (di->cache.flags & BQ27000_FLAG_FC)
785 status = POWER_SUPPLY_STATUS_FULL;
786 else if (di->cache.flags & BQ27000_FLAG_CHGS)
787 status = POWER_SUPPLY_STATUS_CHARGING;
788 else if (power_supply_am_i_supplied(di->bat))
789 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
790 else
791 status = POWER_SUPPLY_STATUS_DISCHARGING;
792 } else {
793 if (di->cache.flags & BQ27XXX_FLAG_FC)
794 status = POWER_SUPPLY_STATUS_FULL;
795 else if (di->cache.flags & BQ27XXX_FLAG_DSC)
796 status = POWER_SUPPLY_STATUS_DISCHARGING;
797 else
798 status = POWER_SUPPLY_STATUS_CHARGING;
799 }
800
801 val->intval = status;
802
803 return 0;
804 }
805
806 static int bq27xxx_battery_capacity_level(struct bq27xxx_device_info *di,
807 union power_supply_propval *val)
808 {
809 int level;
810
811 if (di->chip == BQ27000 || di->chip == BQ27010) {
812 if (di->cache.flags & BQ27000_FLAG_FC)
813 level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
814 else if (di->cache.flags & BQ27000_FLAG_EDV1)
815 level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
816 else if (di->cache.flags & BQ27000_FLAG_EDVF)
817 level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
818 else
819 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
820 } else {
821 if (di->cache.flags & BQ27XXX_FLAG_FC)
822 level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
823 else if (di->cache.flags & BQ27XXX_FLAG_SOC1)
824 level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
825 else if (di->cache.flags & BQ27XXX_FLAG_SOCF)
826 level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
827 else
828 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
829 }
830
831 val->intval = level;
832
833 return 0;
834 }
835
836 /*
837 * Return the battery Voltage in millivolts
838 * Or < 0 if something fails.
839 */
840 static int bq27xxx_battery_voltage(struct bq27xxx_device_info *di,
841 union power_supply_propval *val)
842 {
843 int volt;
844
845 volt = bq27xxx_read(di, BQ27XXX_REG_VOLT, false);
846 if (volt < 0) {
847 dev_err(di->dev, "error reading voltage\n");
848 return volt;
849 }
850
851 val->intval = volt * 1000;
852
853 return 0;
854 }
855
856 static int bq27xxx_simple_value(int value,
857 union power_supply_propval *val)
858 {
859 if (value < 0)
860 return value;
861
862 val->intval = value;
863
864 return 0;
865 }
866
867 static int bq27xxx_battery_get_property(struct power_supply *psy,
868 enum power_supply_property psp,
869 union power_supply_propval *val)
870 {
871 int ret = 0;
872 struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
873
874 mutex_lock(&di->lock);
875 if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
876 cancel_delayed_work_sync(&di->work);
877 bq27xxx_battery_poll(&di->work.work);
878 }
879 mutex_unlock(&di->lock);
880
881 if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
882 return -ENODEV;
883
884 switch (psp) {
885 case POWER_SUPPLY_PROP_STATUS:
886 ret = bq27xxx_battery_status(di, val);
887 break;
888 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
889 ret = bq27xxx_battery_voltage(di, val);
890 break;
891 case POWER_SUPPLY_PROP_PRESENT:
892 val->intval = di->cache.flags < 0 ? 0 : 1;
893 break;
894 case POWER_SUPPLY_PROP_CURRENT_NOW:
895 ret = bq27xxx_battery_current(di, val);
896 break;
897 case POWER_SUPPLY_PROP_CAPACITY:
898 ret = bq27xxx_simple_value(di->cache.capacity, val);
899 break;
900 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
901 ret = bq27xxx_battery_capacity_level(di, val);
902 break;
903 case POWER_SUPPLY_PROP_TEMP:
904 ret = bq27xxx_simple_value(di->cache.temperature, val);
905 if (ret == 0)
906 val->intval -= 2731; /* convert decidegree k to c */
907 break;
908 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
909 ret = bq27xxx_simple_value(di->cache.time_to_empty, val);
910 break;
911 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
912 ret = bq27xxx_simple_value(di->cache.time_to_empty_avg, val);
913 break;
914 case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
915 ret = bq27xxx_simple_value(di->cache.time_to_full, val);
916 break;
917 case POWER_SUPPLY_PROP_TECHNOLOGY:
918 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
919 break;
920 case POWER_SUPPLY_PROP_CHARGE_NOW:
921 ret = bq27xxx_simple_value(bq27xxx_battery_read_nac(di), val);
922 break;
923 case POWER_SUPPLY_PROP_CHARGE_FULL:
924 ret = bq27xxx_simple_value(di->cache.charge_full, val);
925 break;
926 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
927 ret = bq27xxx_simple_value(di->charge_design_full, val);
928 break;
929 case POWER_SUPPLY_PROP_CYCLE_COUNT:
930 ret = bq27xxx_simple_value(di->cache.cycle_count, val);
931 break;
932 case POWER_SUPPLY_PROP_ENERGY_NOW:
933 ret = bq27xxx_simple_value(di->cache.energy, val);
934 break;
935 case POWER_SUPPLY_PROP_POWER_AVG:
936 ret = bq27xxx_simple_value(di->cache.power_avg, val);
937 break;
938 case POWER_SUPPLY_PROP_HEALTH:
939 ret = bq27xxx_simple_value(di->cache.health, val);
940 break;
941 case POWER_SUPPLY_PROP_MANUFACTURER:
942 val->strval = BQ27XXX_MANUFACTURER;
943 break;
944 default:
945 return -EINVAL;
946 }
947
948 return ret;
949 }
950
951 static void bq27xxx_external_power_changed(struct power_supply *psy)
952 {
953 struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
954
955 cancel_delayed_work_sync(&di->work);
956 schedule_delayed_work(&di->work, 0);
957 }
958
959 int bq27xxx_battery_setup(struct bq27xxx_device_info *di)
960 {
961 struct power_supply_desc *psy_desc;
962 struct power_supply_config psy_cfg = { .drv_data = di, };
963
964 INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
965 mutex_init(&di->lock);
966 di->regs = bq27xxx_regs[di->chip];
967
968 psy_desc = devm_kzalloc(di->dev, sizeof(*psy_desc), GFP_KERNEL);
969 if (!psy_desc)
970 return -ENOMEM;
971
972 psy_desc->name = di->name;
973 psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
974 psy_desc->properties = bq27xxx_battery_props[di->chip].props;
975 psy_desc->num_properties = bq27xxx_battery_props[di->chip].size;
976 psy_desc->get_property = bq27xxx_battery_get_property;
977 psy_desc->external_power_changed = bq27xxx_external_power_changed;
978
979 di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
980 if (IS_ERR(di->bat)) {
981 dev_err(di->dev, "failed to register battery\n");
982 return PTR_ERR(di->bat);
983 }
984
985 dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
986
987 bq27xxx_battery_update(di);
988
989 return 0;
990 }
991 EXPORT_SYMBOL_GPL(bq27xxx_battery_setup);
992
993 void bq27xxx_battery_teardown(struct bq27xxx_device_info *di)
994 {
995 /*
996 * power_supply_unregister call bq27xxx_battery_get_property which
997 * call bq27xxx_battery_poll.
998 * Make sure that bq27xxx_battery_poll will not call
999 * schedule_delayed_work again after unregister (which cause OOPS).
1000 */
1001 poll_interval = 0;
1002
1003 cancel_delayed_work_sync(&di->work);
1004
1005 power_supply_unregister(di->bat);
1006
1007 mutex_destroy(&di->lock);
1008 }
1009 EXPORT_SYMBOL_GPL(bq27xxx_battery_teardown);
1010
1011 static int bq27xxx_battery_platform_read(struct bq27xxx_device_info *di, u8 reg,
1012 bool single)
1013 {
1014 struct device *dev = di->dev;
1015 struct bq27xxx_platform_data *pdata = dev->platform_data;
1016 unsigned int timeout = 3;
1017 int upper, lower;
1018 int temp;
1019
1020 if (!single) {
1021 /* Make sure the value has not changed in between reading the
1022 * lower and the upper part */
1023 upper = pdata->read(dev, reg + 1);
1024 do {
1025 temp = upper;
1026 if (upper < 0)
1027 return upper;
1028
1029 lower = pdata->read(dev, reg);
1030 if (lower < 0)
1031 return lower;
1032
1033 upper = pdata->read(dev, reg + 1);
1034 } while (temp != upper && --timeout);
1035
1036 if (timeout == 0)
1037 return -EIO;
1038
1039 return (upper << 8) | lower;
1040 }
1041
1042 return pdata->read(dev, reg);
1043 }
1044
1045 static int bq27xxx_battery_platform_probe(struct platform_device *pdev)
1046 {
1047 struct bq27xxx_device_info *di;
1048 struct bq27xxx_platform_data *pdata = pdev->dev.platform_data;
1049
1050 if (!pdata) {
1051 dev_err(&pdev->dev, "no platform_data supplied\n");
1052 return -EINVAL;
1053 }
1054
1055 if (!pdata->read) {
1056 dev_err(&pdev->dev, "no hdq read callback supplied\n");
1057 return -EINVAL;
1058 }
1059
1060 if (!pdata->chip) {
1061 dev_err(&pdev->dev, "no device supplied\n");
1062 return -EINVAL;
1063 }
1064
1065 di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1066 if (!di)
1067 return -ENOMEM;
1068
1069 platform_set_drvdata(pdev, di);
1070
1071 di->dev = &pdev->dev;
1072 di->chip = pdata->chip;
1073 di->name = pdata->name ?: dev_name(&pdev->dev);
1074 di->bus.read = bq27xxx_battery_platform_read;
1075
1076 return bq27xxx_battery_setup(di);
1077 }
1078
1079 static int bq27xxx_battery_platform_remove(struct platform_device *pdev)
1080 {
1081 struct bq27xxx_device_info *di = platform_get_drvdata(pdev);
1082
1083 bq27xxx_battery_teardown(di);
1084
1085 return 0;
1086 }
1087
1088 static const struct platform_device_id bq27xxx_battery_platform_id_table[] = {
1089 { "bq27000-battery", },
1090 { /* sentinel */ }
1091 };
1092 MODULE_DEVICE_TABLE(platform, bq27xxx_battery_platform_id_table);
1093
1094 #ifdef CONFIG_OF
1095 static const struct of_device_id bq27xxx_battery_platform_of_match_table[] = {
1096 { .compatible = "ti,bq27000" },
1097 {},
1098 };
1099 MODULE_DEVICE_TABLE(of, bq27xxx_battery_platform_of_match_table);
1100 #endif
1101
1102 static struct platform_driver bq27xxx_battery_platform_driver = {
1103 .probe = bq27xxx_battery_platform_probe,
1104 .remove = bq27xxx_battery_platform_remove,
1105 .driver = {
1106 .name = "bq27000-battery",
1107 .of_match_table = of_match_ptr(bq27xxx_battery_platform_of_match_table),
1108 },
1109 .id_table = bq27xxx_battery_platform_id_table,
1110 };
1111 module_platform_driver(bq27xxx_battery_platform_driver);
1112
1113 MODULE_ALIAS("platform:bq27000-battery");
1114
1115 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1116 MODULE_DESCRIPTION("BQ27xxx battery monitor driver");
1117 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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