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/mutex.h>
43 #include <linux/param.h>
44 #include <linux/jiffies.h>
45 #include <linux/workqueue.h>
46 #include <linux/delay.h>
47 #include <linux/platform_device.h>
48 #include <linux/power_supply.h>
49 #include <linux/slab.h>
50 #include <linux/of.h>
51
52 #include <linux/power/bq27xxx_battery.h>
53
54 #define DRIVER_VERSION "1.2.0"
55
56 #define BQ27XXX_MANUFACTURER "Texas Instruments"
57
58 /* BQ27XXX Flags */
59 #define BQ27XXX_FLAG_DSC BIT(0)
60 #define BQ27XXX_FLAG_SOCF BIT(1) /* State-of-Charge threshold final */
61 #define BQ27XXX_FLAG_SOC1 BIT(2) /* State-of-Charge threshold 1 */
62 #define BQ27XXX_FLAG_FC BIT(9)
63 #define BQ27XXX_FLAG_OTD BIT(14)
64 #define BQ27XXX_FLAG_OTC BIT(15)
65 #define BQ27XXX_FLAG_UT BIT(14)
66 #define BQ27XXX_FLAG_OT BIT(15)
67
68 /* BQ27000 has different layout for Flags register */
69 #define BQ27000_FLAG_EDVF BIT(0) /* Final End-of-Discharge-Voltage flag */
70 #define BQ27000_FLAG_EDV1 BIT(1) /* First End-of-Discharge-Voltage flag */
71 #define BQ27000_FLAG_CI BIT(4) /* Capacity Inaccurate flag */
72 #define BQ27000_FLAG_FC BIT(5)
73 #define BQ27000_FLAG_CHGS BIT(7) /* Charge state flag */
74
75 #define BQ27XXX_RS (20) /* Resistor sense mOhm */
76 #define BQ27XXX_POWER_CONSTANT (29200) /* 29.2 µV^2 * 1000 */
77 #define BQ27XXX_CURRENT_CONSTANT (3570) /* 3.57 µV * 1000 */
78
79 #define INVALID_REG_ADDR 0xff
80
81 /*
82 * bq27xxx_reg_index - Register names
83 *
84 * These are indexes into a device's register mapping array.
85 */
86
87 enum bq27xxx_reg_index {
88 BQ27XXX_REG_CTRL = 0, /* Control */
89 BQ27XXX_REG_TEMP, /* Temperature */
90 BQ27XXX_REG_INT_TEMP, /* Internal Temperature */
91 BQ27XXX_REG_VOLT, /* Voltage */
92 BQ27XXX_REG_AI, /* Average Current */
93 BQ27XXX_REG_FLAGS, /* Flags */
94 BQ27XXX_REG_TTE, /* Time-to-Empty */
95 BQ27XXX_REG_TTF, /* Time-to-Full */
96 BQ27XXX_REG_TTES, /* Time-to-Empty Standby */
97 BQ27XXX_REG_TTECP, /* Time-to-Empty at Constant Power */
98 BQ27XXX_REG_NAC, /* Nominal Available Capacity */
99 BQ27XXX_REG_FCC, /* Full Charge Capacity */
100 BQ27XXX_REG_CYCT, /* Cycle Count */
101 BQ27XXX_REG_AE, /* Available Energy */
102 BQ27XXX_REG_SOC, /* State-of-Charge */
103 BQ27XXX_REG_DCAP, /* Design Capacity */
104 BQ27XXX_REG_AP, /* Average Power */
105 BQ27XXX_REG_MAX, /* sentinel */
106 };
107
108 /* Register mappings */
109 static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
110 [BQ27000] = {
111 [BQ27XXX_REG_CTRL] = 0x00,
112 [BQ27XXX_REG_TEMP] = 0x06,
113 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
114 [BQ27XXX_REG_VOLT] = 0x08,
115 [BQ27XXX_REG_AI] = 0x14,
116 [BQ27XXX_REG_FLAGS] = 0x0a,
117 [BQ27XXX_REG_TTE] = 0x16,
118 [BQ27XXX_REG_TTF] = 0x18,
119 [BQ27XXX_REG_TTES] = 0x1c,
120 [BQ27XXX_REG_TTECP] = 0x26,
121 [BQ27XXX_REG_NAC] = 0x0c,
122 [BQ27XXX_REG_FCC] = 0x12,
123 [BQ27XXX_REG_CYCT] = 0x2a,
124 [BQ27XXX_REG_AE] = 0x22,
125 [BQ27XXX_REG_SOC] = 0x0b,
126 [BQ27XXX_REG_DCAP] = 0x76,
127 [BQ27XXX_REG_AP] = 0x24,
128 },
129 [BQ27010] = {
130 [BQ27XXX_REG_CTRL] = 0x00,
131 [BQ27XXX_REG_TEMP] = 0x06,
132 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
133 [BQ27XXX_REG_VOLT] = 0x08,
134 [BQ27XXX_REG_AI] = 0x14,
135 [BQ27XXX_REG_FLAGS] = 0x0a,
136 [BQ27XXX_REG_TTE] = 0x16,
137 [BQ27XXX_REG_TTF] = 0x18,
138 [BQ27XXX_REG_TTES] = 0x1c,
139 [BQ27XXX_REG_TTECP] = 0x26,
140 [BQ27XXX_REG_NAC] = 0x0c,
141 [BQ27XXX_REG_FCC] = 0x12,
142 [BQ27XXX_REG_CYCT] = 0x2a,
143 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
144 [BQ27XXX_REG_SOC] = 0x0b,
145 [BQ27XXX_REG_DCAP] = 0x76,
146 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
147 },
148 [BQ27500] = {
149 [BQ27XXX_REG_CTRL] = 0x00,
150 [BQ27XXX_REG_TEMP] = 0x06,
151 [BQ27XXX_REG_INT_TEMP] = 0x28,
152 [BQ27XXX_REG_VOLT] = 0x08,
153 [BQ27XXX_REG_AI] = 0x14,
154 [BQ27XXX_REG_FLAGS] = 0x0a,
155 [BQ27XXX_REG_TTE] = 0x16,
156 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
157 [BQ27XXX_REG_TTES] = 0x1a,
158 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
159 [BQ27XXX_REG_NAC] = 0x0c,
160 [BQ27XXX_REG_FCC] = 0x12,
161 [BQ27XXX_REG_CYCT] = 0x2a,
162 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
163 [BQ27XXX_REG_SOC] = 0x2c,
164 [BQ27XXX_REG_DCAP] = 0x3c,
165 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
166 },
167 [BQ27510] = {
168 [BQ27XXX_REG_CTRL] = 0x00,
169 [BQ27XXX_REG_TEMP] = 0x06,
170 [BQ27XXX_REG_INT_TEMP] = 0x28,
171 [BQ27XXX_REG_VOLT] = 0x08,
172 [BQ27XXX_REG_AI] = 0x14,
173 [BQ27XXX_REG_FLAGS] = 0x0a,
174 [BQ27XXX_REG_TTE] = 0x16,
175 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
176 [BQ27XXX_REG_TTES] = 0x1a,
177 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
178 [BQ27XXX_REG_NAC] = 0x0c,
179 [BQ27XXX_REG_FCC] = 0x12,
180 [BQ27XXX_REG_CYCT] = 0x1e,
181 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
182 [BQ27XXX_REG_SOC] = 0x20,
183 [BQ27XXX_REG_DCAP] = 0x2e,
184 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
185 },
186 [BQ27530] = {
187 [BQ27XXX_REG_CTRL] = 0x00,
188 [BQ27XXX_REG_TEMP] = 0x06,
189 [BQ27XXX_REG_INT_TEMP] = 0x32,
190 [BQ27XXX_REG_VOLT] = 0x08,
191 [BQ27XXX_REG_AI] = 0x14,
192 [BQ27XXX_REG_FLAGS] = 0x0a,
193 [BQ27XXX_REG_TTE] = 0x16,
194 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
195 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
196 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
197 [BQ27XXX_REG_NAC] = 0x0c,
198 [BQ27XXX_REG_FCC] = 0x12,
199 [BQ27XXX_REG_CYCT] = 0x2a,
200 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
201 [BQ27XXX_REG_SOC] = 0x2c,
202 [BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
203 [BQ27XXX_REG_AP] = 0x24,
204 },
205 [BQ27541] = {
206 [BQ27XXX_REG_CTRL] = 0x00,
207 [BQ27XXX_REG_TEMP] = 0x06,
208 [BQ27XXX_REG_INT_TEMP] = 0x28,
209 [BQ27XXX_REG_VOLT] = 0x08,
210 [BQ27XXX_REG_AI] = 0x14,
211 [BQ27XXX_REG_FLAGS] = 0x0a,
212 [BQ27XXX_REG_TTE] = 0x16,
213 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
214 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
215 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
216 [BQ27XXX_REG_NAC] = 0x0c,
217 [BQ27XXX_REG_FCC] = 0x12,
218 [BQ27XXX_REG_CYCT] = 0x2a,
219 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
220 [BQ27XXX_REG_SOC] = 0x2c,
221 [BQ27XXX_REG_DCAP] = 0x3c,
222 [BQ27XXX_REG_AP] = 0x24,
223 },
224 [BQ27545] = {
225 [BQ27XXX_REG_CTRL] = 0x00,
226 [BQ27XXX_REG_TEMP] = 0x06,
227 [BQ27XXX_REG_INT_TEMP] = 0x28,
228 [BQ27XXX_REG_VOLT] = 0x08,
229 [BQ27XXX_REG_AI] = 0x14,
230 [BQ27XXX_REG_FLAGS] = 0x0a,
231 [BQ27XXX_REG_TTE] = 0x16,
232 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
233 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
234 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
235 [BQ27XXX_REG_NAC] = 0x0c,
236 [BQ27XXX_REG_FCC] = 0x12,
237 [BQ27XXX_REG_CYCT] = 0x2a,
238 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
239 [BQ27XXX_REG_SOC] = 0x2c,
240 [BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
241 [BQ27XXX_REG_AP] = 0x24,
242 },
243 [BQ27421] = {
244 [BQ27XXX_REG_CTRL] = 0x00,
245 [BQ27XXX_REG_TEMP] = 0x02,
246 [BQ27XXX_REG_INT_TEMP] = 0x1e,
247 [BQ27XXX_REG_VOLT] = 0x04,
248 [BQ27XXX_REG_AI] = 0x10,
249 [BQ27XXX_REG_FLAGS] = 0x06,
250 [BQ27XXX_REG_TTE] = INVALID_REG_ADDR,
251 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
252 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
253 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
254 [BQ27XXX_REG_NAC] = 0x08,
255 [BQ27XXX_REG_FCC] = 0x0e,
256 [BQ27XXX_REG_CYCT] = INVALID_REG_ADDR,
257 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
258 [BQ27XXX_REG_SOC] = 0x1c,
259 [BQ27XXX_REG_DCAP] = 0x3c,
260 [BQ27XXX_REG_AP] = 0x18,
261 },
262 };
263
264 static enum power_supply_property bq27000_battery_props[] = {
265 POWER_SUPPLY_PROP_STATUS,
266 POWER_SUPPLY_PROP_PRESENT,
267 POWER_SUPPLY_PROP_VOLTAGE_NOW,
268 POWER_SUPPLY_PROP_CURRENT_NOW,
269 POWER_SUPPLY_PROP_CAPACITY,
270 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
271 POWER_SUPPLY_PROP_TEMP,
272 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
273 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
274 POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
275 POWER_SUPPLY_PROP_TECHNOLOGY,
276 POWER_SUPPLY_PROP_CHARGE_FULL,
277 POWER_SUPPLY_PROP_CHARGE_NOW,
278 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
279 POWER_SUPPLY_PROP_CYCLE_COUNT,
280 POWER_SUPPLY_PROP_ENERGY_NOW,
281 POWER_SUPPLY_PROP_POWER_AVG,
282 POWER_SUPPLY_PROP_HEALTH,
283 POWER_SUPPLY_PROP_MANUFACTURER,
284 };
285
286 static enum power_supply_property bq27010_battery_props[] = {
287 POWER_SUPPLY_PROP_STATUS,
288 POWER_SUPPLY_PROP_PRESENT,
289 POWER_SUPPLY_PROP_VOLTAGE_NOW,
290 POWER_SUPPLY_PROP_CURRENT_NOW,
291 POWER_SUPPLY_PROP_CAPACITY,
292 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
293 POWER_SUPPLY_PROP_TEMP,
294 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
295 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
296 POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
297 POWER_SUPPLY_PROP_TECHNOLOGY,
298 POWER_SUPPLY_PROP_CHARGE_FULL,
299 POWER_SUPPLY_PROP_CHARGE_NOW,
300 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
301 POWER_SUPPLY_PROP_CYCLE_COUNT,
302 POWER_SUPPLY_PROP_HEALTH,
303 POWER_SUPPLY_PROP_MANUFACTURER,
304 };
305
306 static enum power_supply_property bq27500_battery_props[] = {
307 POWER_SUPPLY_PROP_STATUS,
308 POWER_SUPPLY_PROP_PRESENT,
309 POWER_SUPPLY_PROP_VOLTAGE_NOW,
310 POWER_SUPPLY_PROP_CURRENT_NOW,
311 POWER_SUPPLY_PROP_CAPACITY,
312 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
313 POWER_SUPPLY_PROP_TEMP,
314 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
315 POWER_SUPPLY_PROP_TECHNOLOGY,
316 POWER_SUPPLY_PROP_CHARGE_FULL,
317 POWER_SUPPLY_PROP_CHARGE_NOW,
318 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
319 POWER_SUPPLY_PROP_CYCLE_COUNT,
320 POWER_SUPPLY_PROP_HEALTH,
321 POWER_SUPPLY_PROP_MANUFACTURER,
322 };
323
324 static enum power_supply_property bq27510_battery_props[] = {
325 POWER_SUPPLY_PROP_STATUS,
326 POWER_SUPPLY_PROP_PRESENT,
327 POWER_SUPPLY_PROP_VOLTAGE_NOW,
328 POWER_SUPPLY_PROP_CURRENT_NOW,
329 POWER_SUPPLY_PROP_CAPACITY,
330 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
331 POWER_SUPPLY_PROP_TEMP,
332 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
333 POWER_SUPPLY_PROP_TECHNOLOGY,
334 POWER_SUPPLY_PROP_CHARGE_FULL,
335 POWER_SUPPLY_PROP_CHARGE_NOW,
336 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
337 POWER_SUPPLY_PROP_CYCLE_COUNT,
338 POWER_SUPPLY_PROP_HEALTH,
339 POWER_SUPPLY_PROP_MANUFACTURER,
340 };
341
342 static enum power_supply_property bq27530_battery_props[] = {
343 POWER_SUPPLY_PROP_STATUS,
344 POWER_SUPPLY_PROP_PRESENT,
345 POWER_SUPPLY_PROP_VOLTAGE_NOW,
346 POWER_SUPPLY_PROP_CURRENT_NOW,
347 POWER_SUPPLY_PROP_CAPACITY,
348 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
349 POWER_SUPPLY_PROP_TEMP,
350 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
351 POWER_SUPPLY_PROP_TECHNOLOGY,
352 POWER_SUPPLY_PROP_CHARGE_FULL,
353 POWER_SUPPLY_PROP_CHARGE_NOW,
354 POWER_SUPPLY_PROP_POWER_AVG,
355 POWER_SUPPLY_PROP_HEALTH,
356 POWER_SUPPLY_PROP_CYCLE_COUNT,
357 POWER_SUPPLY_PROP_MANUFACTURER,
358 };
359
360 static enum power_supply_property bq27541_battery_props[] = {
361 POWER_SUPPLY_PROP_STATUS,
362 POWER_SUPPLY_PROP_PRESENT,
363 POWER_SUPPLY_PROP_VOLTAGE_NOW,
364 POWER_SUPPLY_PROP_CURRENT_NOW,
365 POWER_SUPPLY_PROP_CAPACITY,
366 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
367 POWER_SUPPLY_PROP_TEMP,
368 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
369 POWER_SUPPLY_PROP_TECHNOLOGY,
370 POWER_SUPPLY_PROP_CHARGE_FULL,
371 POWER_SUPPLY_PROP_CHARGE_NOW,
372 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
373 POWER_SUPPLY_PROP_CYCLE_COUNT,
374 POWER_SUPPLY_PROP_POWER_AVG,
375 POWER_SUPPLY_PROP_HEALTH,
376 POWER_SUPPLY_PROP_MANUFACTURER,
377 };
378
379 static enum power_supply_property bq27545_battery_props[] = {
380 POWER_SUPPLY_PROP_STATUS,
381 POWER_SUPPLY_PROP_PRESENT,
382 POWER_SUPPLY_PROP_VOLTAGE_NOW,
383 POWER_SUPPLY_PROP_CURRENT_NOW,
384 POWER_SUPPLY_PROP_CAPACITY,
385 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
386 POWER_SUPPLY_PROP_TEMP,
387 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
388 POWER_SUPPLY_PROP_TECHNOLOGY,
389 POWER_SUPPLY_PROP_CHARGE_FULL,
390 POWER_SUPPLY_PROP_CHARGE_NOW,
391 POWER_SUPPLY_PROP_HEALTH,
392 POWER_SUPPLY_PROP_CYCLE_COUNT,
393 POWER_SUPPLY_PROP_POWER_AVG,
394 POWER_SUPPLY_PROP_MANUFACTURER,
395 };
396
397 static enum power_supply_property bq27421_battery_props[] = {
398 POWER_SUPPLY_PROP_STATUS,
399 POWER_SUPPLY_PROP_PRESENT,
400 POWER_SUPPLY_PROP_VOLTAGE_NOW,
401 POWER_SUPPLY_PROP_CURRENT_NOW,
402 POWER_SUPPLY_PROP_CAPACITY,
403 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
404 POWER_SUPPLY_PROP_TEMP,
405 POWER_SUPPLY_PROP_TECHNOLOGY,
406 POWER_SUPPLY_PROP_CHARGE_FULL,
407 POWER_SUPPLY_PROP_CHARGE_NOW,
408 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
409 POWER_SUPPLY_PROP_MANUFACTURER,
410 };
411
412 #define BQ27XXX_PROP(_id, _prop) \
413 [_id] = { \
414 .props = _prop, \
415 .size = ARRAY_SIZE(_prop), \
416 }
417
418 static struct {
419 enum power_supply_property *props;
420 size_t size;
421 } bq27xxx_battery_props[] = {
422 BQ27XXX_PROP(BQ27000, bq27000_battery_props),
423 BQ27XXX_PROP(BQ27010, bq27010_battery_props),
424 BQ27XXX_PROP(BQ27500, bq27500_battery_props),
425 BQ27XXX_PROP(BQ27510, bq27510_battery_props),
426 BQ27XXX_PROP(BQ27530, bq27530_battery_props),
427 BQ27XXX_PROP(BQ27541, bq27541_battery_props),
428 BQ27XXX_PROP(BQ27545, bq27545_battery_props),
429 BQ27XXX_PROP(BQ27421, bq27421_battery_props),
430 };
431
432 static DEFINE_MUTEX(bq27xxx_list_lock);
433 static LIST_HEAD(bq27xxx_battery_devices);
434
poll_interval_param_set(const char * val,const struct kernel_param * kp)435 static int poll_interval_param_set(const char *val, const struct kernel_param *kp)
436 {
437 struct bq27xxx_device_info *di;
438 int ret;
439
440 ret = param_set_uint(val, kp);
441 if (ret < 0)
442 return ret;
443
444 mutex_lock(&bq27xxx_list_lock);
445 list_for_each_entry(di, &bq27xxx_battery_devices, list) {
446 cancel_delayed_work_sync(&di->work);
447 schedule_delayed_work(&di->work, 0);
448 }
449 mutex_unlock(&bq27xxx_list_lock);
450
451 return ret;
452 }
453
454 static const struct kernel_param_ops param_ops_poll_interval = {
455 .get = param_get_uint,
456 .set = poll_interval_param_set,
457 };
458
459 static unsigned int poll_interval = 360;
460 module_param_cb(poll_interval, ¶m_ops_poll_interval, &poll_interval, 0644);
461 MODULE_PARM_DESC(poll_interval,
462 "battery poll interval in seconds - 0 disables polling");
463
464 /*
465 * Common code for BQ27xxx devices
466 */
467
bq27xxx_read(struct bq27xxx_device_info * di,int reg_index,bool single)468 static inline int bq27xxx_read(struct bq27xxx_device_info *di, int reg_index,
469 bool single)
470 {
471 /* Reports EINVAL for invalid/missing registers */
472 if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
473 return -EINVAL;
474
475 return di->bus.read(di, di->regs[reg_index], single);
476 }
477
478 /*
479 * Return the battery State-of-Charge
480 * Or < 0 if something fails.
481 */
bq27xxx_battery_read_soc(struct bq27xxx_device_info * di)482 static int bq27xxx_battery_read_soc(struct bq27xxx_device_info *di)
483 {
484 int soc;
485
486 if (di->chip == BQ27000 || di->chip == BQ27010)
487 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, true);
488 else
489 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
490
491 if (soc < 0)
492 dev_dbg(di->dev, "error reading State-of-Charge\n");
493
494 return soc;
495 }
496
497 /*
498 * Return a battery charge value in µAh
499 * Or < 0 if something fails.
500 */
bq27xxx_battery_read_charge(struct bq27xxx_device_info * di,u8 reg)501 static int bq27xxx_battery_read_charge(struct bq27xxx_device_info *di, u8 reg)
502 {
503 int charge;
504
505 charge = bq27xxx_read(di, reg, false);
506 if (charge < 0) {
507 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
508 reg, charge);
509 return charge;
510 }
511
512 if (di->chip == BQ27000 || di->chip == BQ27010)
513 charge *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
514 else
515 charge *= 1000;
516
517 return charge;
518 }
519
520 /*
521 * Return the battery Nominal available capacity in µAh
522 * Or < 0 if something fails.
523 */
bq27xxx_battery_read_nac(struct bq27xxx_device_info * di)524 static inline int bq27xxx_battery_read_nac(struct bq27xxx_device_info *di)
525 {
526 int flags;
527
528 if (di->chip == BQ27000 || di->chip == BQ27010) {
529 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
530 if (flags >= 0 && (flags & BQ27000_FLAG_CI))
531 return -ENODATA;
532 }
533
534 return bq27xxx_battery_read_charge(di, BQ27XXX_REG_NAC);
535 }
536
537 /*
538 * Return the battery Full Charge Capacity in µAh
539 * Or < 0 if something fails.
540 */
bq27xxx_battery_read_fcc(struct bq27xxx_device_info * di)541 static inline int bq27xxx_battery_read_fcc(struct bq27xxx_device_info *di)
542 {
543 return bq27xxx_battery_read_charge(di, BQ27XXX_REG_FCC);
544 }
545
546 /*
547 * Return the Design Capacity in µAh
548 * Or < 0 if something fails.
549 */
bq27xxx_battery_read_dcap(struct bq27xxx_device_info * di)550 static int bq27xxx_battery_read_dcap(struct bq27xxx_device_info *di)
551 {
552 int dcap;
553
554 if (di->chip == BQ27000 || di->chip == BQ27010)
555 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, true);
556 else
557 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
558
559 if (dcap < 0) {
560 dev_dbg(di->dev, "error reading initial last measured discharge\n");
561 return dcap;
562 }
563
564 if (di->chip == BQ27000 || di->chip == BQ27010)
565 dcap = (dcap << 8) * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
566 else
567 dcap *= 1000;
568
569 return dcap;
570 }
571
572 /*
573 * Return the battery Available energy in µWh
574 * Or < 0 if something fails.
575 */
bq27xxx_battery_read_energy(struct bq27xxx_device_info * di)576 static int bq27xxx_battery_read_energy(struct bq27xxx_device_info *di)
577 {
578 int ae;
579
580 ae = bq27xxx_read(di, BQ27XXX_REG_AE, false);
581 if (ae < 0) {
582 dev_dbg(di->dev, "error reading available energy\n");
583 return ae;
584 }
585
586 if (di->chip == BQ27000 || di->chip == BQ27010)
587 ae *= BQ27XXX_POWER_CONSTANT / BQ27XXX_RS;
588 else
589 ae *= 1000;
590
591 return ae;
592 }
593
594 /*
595 * Return the battery temperature in tenths of degree Kelvin
596 * Or < 0 if something fails.
597 */
bq27xxx_battery_read_temperature(struct bq27xxx_device_info * di)598 static int bq27xxx_battery_read_temperature(struct bq27xxx_device_info *di)
599 {
600 int temp;
601
602 temp = bq27xxx_read(di, BQ27XXX_REG_TEMP, false);
603 if (temp < 0) {
604 dev_err(di->dev, "error reading temperature\n");
605 return temp;
606 }
607
608 if (di->chip == BQ27000 || di->chip == BQ27010)
609 temp = 5 * temp / 2;
610
611 return temp;
612 }
613
614 /*
615 * Return the battery Cycle count total
616 * Or < 0 if something fails.
617 */
bq27xxx_battery_read_cyct(struct bq27xxx_device_info * di)618 static int bq27xxx_battery_read_cyct(struct bq27xxx_device_info *di)
619 {
620 int cyct;
621
622 cyct = bq27xxx_read(di, BQ27XXX_REG_CYCT, false);
623 if (cyct < 0)
624 dev_err(di->dev, "error reading cycle count total\n");
625
626 return cyct;
627 }
628
629 /*
630 * Read a time register.
631 * Return < 0 if something fails.
632 */
bq27xxx_battery_read_time(struct bq27xxx_device_info * di,u8 reg)633 static int bq27xxx_battery_read_time(struct bq27xxx_device_info *di, u8 reg)
634 {
635 int tval;
636
637 tval = bq27xxx_read(di, reg, false);
638 if (tval < 0) {
639 dev_dbg(di->dev, "error reading time register %02x: %d\n",
640 reg, tval);
641 return tval;
642 }
643
644 if (tval == 65535)
645 return -ENODATA;
646
647 return tval * 60;
648 }
649
650 /*
651 * Read an average power register.
652 * Return < 0 if something fails.
653 */
bq27xxx_battery_read_pwr_avg(struct bq27xxx_device_info * di)654 static int bq27xxx_battery_read_pwr_avg(struct bq27xxx_device_info *di)
655 {
656 int tval;
657
658 tval = bq27xxx_read(di, BQ27XXX_REG_AP, false);
659 if (tval < 0) {
660 dev_err(di->dev, "error reading average power register %02x: %d\n",
661 BQ27XXX_REG_AP, tval);
662 return tval;
663 }
664
665 if (di->chip == BQ27000 || di->chip == BQ27010)
666 return (tval * BQ27XXX_POWER_CONSTANT) / BQ27XXX_RS;
667 else
668 return tval;
669 }
670
671 /*
672 * Returns true if a battery over temperature condition is detected
673 */
bq27xxx_battery_overtemp(struct bq27xxx_device_info * di,u16 flags)674 static bool bq27xxx_battery_overtemp(struct bq27xxx_device_info *di, u16 flags)
675 {
676 if (di->chip == BQ27500 || di->chip == BQ27510 ||
677 di->chip == BQ27541 || di->chip == BQ27545)
678 return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD);
679 if (di->chip == BQ27530 || di->chip == BQ27421)
680 return flags & BQ27XXX_FLAG_OT;
681
682 return false;
683 }
684
685 /*
686 * Returns true if a battery under temperature condition is detected
687 */
bq27xxx_battery_undertemp(struct bq27xxx_device_info * di,u16 flags)688 static bool bq27xxx_battery_undertemp(struct bq27xxx_device_info *di, u16 flags)
689 {
690 if (di->chip == BQ27530 || di->chip == BQ27421)
691 return flags & BQ27XXX_FLAG_UT;
692
693 return false;
694 }
695
696 /*
697 * Returns true if a low state of charge condition is detected
698 */
bq27xxx_battery_dead(struct bq27xxx_device_info * di,u16 flags)699 static bool bq27xxx_battery_dead(struct bq27xxx_device_info *di, u16 flags)
700 {
701 if (di->chip == BQ27000 || di->chip == BQ27010)
702 return flags & (BQ27000_FLAG_EDV1 | BQ27000_FLAG_EDVF);
703 else
704 return flags & (BQ27XXX_FLAG_SOC1 | BQ27XXX_FLAG_SOCF);
705 }
706
707 /*
708 * Read flag register.
709 * Return < 0 if something fails.
710 */
bq27xxx_battery_read_health(struct bq27xxx_device_info * di)711 static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di)
712 {
713 int flags;
714 bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
715
716 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
717 if (flags < 0) {
718 dev_err(di->dev, "error reading flag register:%d\n", flags);
719 return flags;
720 }
721
722 /* Unlikely but important to return first */
723 if (unlikely(bq27xxx_battery_overtemp(di, flags)))
724 return POWER_SUPPLY_HEALTH_OVERHEAT;
725 if (unlikely(bq27xxx_battery_undertemp(di, flags)))
726 return POWER_SUPPLY_HEALTH_COLD;
727 if (unlikely(bq27xxx_battery_dead(di, flags)))
728 return POWER_SUPPLY_HEALTH_DEAD;
729
730 return POWER_SUPPLY_HEALTH_GOOD;
731 }
732
bq27xxx_battery_update(struct bq27xxx_device_info * di)733 void bq27xxx_battery_update(struct bq27xxx_device_info *di)
734 {
735 struct bq27xxx_reg_cache cache = {0, };
736 bool has_ci_flag = di->chip == BQ27000 || di->chip == BQ27010;
737 bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
738
739 cache.flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
740 if ((cache.flags & 0xff) == 0xff)
741 cache.flags = -1; /* read error */
742 if (cache.flags >= 0) {
743 cache.temperature = bq27xxx_battery_read_temperature(di);
744 if (has_ci_flag && (cache.flags & BQ27000_FLAG_CI)) {
745 dev_info_once(di->dev, "battery is not calibrated! ignoring capacity values\n");
746 cache.capacity = -ENODATA;
747 cache.energy = -ENODATA;
748 cache.time_to_empty = -ENODATA;
749 cache.time_to_empty_avg = -ENODATA;
750 cache.time_to_full = -ENODATA;
751 cache.charge_full = -ENODATA;
752 cache.health = -ENODATA;
753 } else {
754 if (di->regs[BQ27XXX_REG_TTE] != INVALID_REG_ADDR)
755 cache.time_to_empty = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTE);
756 if (di->regs[BQ27XXX_REG_TTECP] != INVALID_REG_ADDR)
757 cache.time_to_empty_avg = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTECP);
758 if (di->regs[BQ27XXX_REG_TTF] != INVALID_REG_ADDR)
759 cache.time_to_full = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTF);
760 cache.charge_full = bq27xxx_battery_read_fcc(di);
761 cache.capacity = bq27xxx_battery_read_soc(di);
762 if (di->regs[BQ27XXX_REG_AE] != INVALID_REG_ADDR)
763 cache.energy = bq27xxx_battery_read_energy(di);
764 cache.health = bq27xxx_battery_read_health(di);
765 }
766 if (di->regs[BQ27XXX_REG_CYCT] != INVALID_REG_ADDR)
767 cache.cycle_count = bq27xxx_battery_read_cyct(di);
768 if (di->regs[BQ27XXX_REG_AP] != INVALID_REG_ADDR)
769 cache.power_avg = bq27xxx_battery_read_pwr_avg(di);
770
771 /* We only have to read charge design full once */
772 if (di->charge_design_full <= 0)
773 di->charge_design_full = bq27xxx_battery_read_dcap(di);
774 }
775
776 if (di->cache.capacity != cache.capacity)
777 power_supply_changed(di->bat);
778
779 if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
780 di->cache = cache;
781
782 di->last_update = jiffies;
783 }
784 EXPORT_SYMBOL_GPL(bq27xxx_battery_update);
785
bq27xxx_battery_poll(struct work_struct * work)786 static void bq27xxx_battery_poll(struct work_struct *work)
787 {
788 struct bq27xxx_device_info *di =
789 container_of(work, struct bq27xxx_device_info,
790 work.work);
791
792 bq27xxx_battery_update(di);
793
794 if (poll_interval > 0)
795 schedule_delayed_work(&di->work, poll_interval * HZ);
796 }
797
798 /*
799 * Return the battery average current in µA
800 * Note that current can be negative signed as well
801 * Or 0 if something fails.
802 */
bq27xxx_battery_current(struct bq27xxx_device_info * di,union power_supply_propval * val)803 static int bq27xxx_battery_current(struct bq27xxx_device_info *di,
804 union power_supply_propval *val)
805 {
806 int curr;
807 int flags;
808
809 curr = bq27xxx_read(di, BQ27XXX_REG_AI, false);
810 if (curr < 0) {
811 dev_err(di->dev, "error reading current\n");
812 return curr;
813 }
814
815 if (di->chip == BQ27000 || di->chip == BQ27010) {
816 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
817 if (flags & BQ27000_FLAG_CHGS) {
818 dev_dbg(di->dev, "negative current!\n");
819 curr = -curr;
820 }
821
822 val->intval = curr * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
823 } else {
824 /* Other gauges return signed value */
825 val->intval = (int)((s16)curr) * 1000;
826 }
827
828 return 0;
829 }
830
bq27xxx_battery_status(struct bq27xxx_device_info * di,union power_supply_propval * val)831 static int bq27xxx_battery_status(struct bq27xxx_device_info *di,
832 union power_supply_propval *val)
833 {
834 int status;
835
836 if (di->chip == BQ27000 || di->chip == BQ27010) {
837 if (di->cache.flags & BQ27000_FLAG_FC)
838 status = POWER_SUPPLY_STATUS_FULL;
839 else if (di->cache.flags & BQ27000_FLAG_CHGS)
840 status = POWER_SUPPLY_STATUS_CHARGING;
841 else if (power_supply_am_i_supplied(di->bat))
842 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
843 else
844 status = POWER_SUPPLY_STATUS_DISCHARGING;
845 } else {
846 if (di->cache.flags & BQ27XXX_FLAG_FC)
847 status = POWER_SUPPLY_STATUS_FULL;
848 else if (di->cache.flags & BQ27XXX_FLAG_DSC)
849 status = POWER_SUPPLY_STATUS_DISCHARGING;
850 else
851 status = POWER_SUPPLY_STATUS_CHARGING;
852 }
853
854 val->intval = status;
855
856 return 0;
857 }
858
bq27xxx_battery_capacity_level(struct bq27xxx_device_info * di,union power_supply_propval * val)859 static int bq27xxx_battery_capacity_level(struct bq27xxx_device_info *di,
860 union power_supply_propval *val)
861 {
862 int level;
863
864 if (di->chip == BQ27000 || di->chip == BQ27010) {
865 if (di->cache.flags & BQ27000_FLAG_FC)
866 level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
867 else if (di->cache.flags & BQ27000_FLAG_EDV1)
868 level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
869 else if (di->cache.flags & BQ27000_FLAG_EDVF)
870 level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
871 else
872 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
873 } else {
874 if (di->cache.flags & BQ27XXX_FLAG_FC)
875 level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
876 else if (di->cache.flags & BQ27XXX_FLAG_SOC1)
877 level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
878 else if (di->cache.flags & BQ27XXX_FLAG_SOCF)
879 level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
880 else
881 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
882 }
883
884 val->intval = level;
885
886 return 0;
887 }
888
889 /*
890 * Return the battery Voltage in millivolts
891 * Or < 0 if something fails.
892 */
bq27xxx_battery_voltage(struct bq27xxx_device_info * di,union power_supply_propval * val)893 static int bq27xxx_battery_voltage(struct bq27xxx_device_info *di,
894 union power_supply_propval *val)
895 {
896 int volt;
897
898 volt = bq27xxx_read(di, BQ27XXX_REG_VOLT, false);
899 if (volt < 0) {
900 dev_err(di->dev, "error reading voltage\n");
901 return volt;
902 }
903
904 val->intval = volt * 1000;
905
906 return 0;
907 }
908
bq27xxx_simple_value(int value,union power_supply_propval * val)909 static int bq27xxx_simple_value(int value,
910 union power_supply_propval *val)
911 {
912 if (value < 0)
913 return value;
914
915 val->intval = value;
916
917 return 0;
918 }
919
bq27xxx_battery_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)920 static int bq27xxx_battery_get_property(struct power_supply *psy,
921 enum power_supply_property psp,
922 union power_supply_propval *val)
923 {
924 int ret = 0;
925 struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
926
927 mutex_lock(&di->lock);
928 if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
929 cancel_delayed_work_sync(&di->work);
930 bq27xxx_battery_poll(&di->work.work);
931 }
932 mutex_unlock(&di->lock);
933
934 if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
935 return -ENODEV;
936
937 switch (psp) {
938 case POWER_SUPPLY_PROP_STATUS:
939 ret = bq27xxx_battery_status(di, val);
940 break;
941 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
942 ret = bq27xxx_battery_voltage(di, val);
943 break;
944 case POWER_SUPPLY_PROP_PRESENT:
945 val->intval = di->cache.flags < 0 ? 0 : 1;
946 break;
947 case POWER_SUPPLY_PROP_CURRENT_NOW:
948 ret = bq27xxx_battery_current(di, val);
949 break;
950 case POWER_SUPPLY_PROP_CAPACITY:
951 ret = bq27xxx_simple_value(di->cache.capacity, val);
952 break;
953 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
954 ret = bq27xxx_battery_capacity_level(di, val);
955 break;
956 case POWER_SUPPLY_PROP_TEMP:
957 ret = bq27xxx_simple_value(di->cache.temperature, val);
958 if (ret == 0)
959 val->intval -= 2731; /* convert decidegree k to c */
960 break;
961 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
962 ret = bq27xxx_simple_value(di->cache.time_to_empty, val);
963 break;
964 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
965 ret = bq27xxx_simple_value(di->cache.time_to_empty_avg, val);
966 break;
967 case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
968 ret = bq27xxx_simple_value(di->cache.time_to_full, val);
969 break;
970 case POWER_SUPPLY_PROP_TECHNOLOGY:
971 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
972 break;
973 case POWER_SUPPLY_PROP_CHARGE_NOW:
974 ret = bq27xxx_simple_value(bq27xxx_battery_read_nac(di), val);
975 break;
976 case POWER_SUPPLY_PROP_CHARGE_FULL:
977 ret = bq27xxx_simple_value(di->cache.charge_full, val);
978 break;
979 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
980 ret = bq27xxx_simple_value(di->charge_design_full, val);
981 break;
982 case POWER_SUPPLY_PROP_CYCLE_COUNT:
983 ret = bq27xxx_simple_value(di->cache.cycle_count, val);
984 break;
985 case POWER_SUPPLY_PROP_ENERGY_NOW:
986 ret = bq27xxx_simple_value(di->cache.energy, val);
987 break;
988 case POWER_SUPPLY_PROP_POWER_AVG:
989 ret = bq27xxx_simple_value(di->cache.power_avg, val);
990 break;
991 case POWER_SUPPLY_PROP_HEALTH:
992 ret = bq27xxx_simple_value(di->cache.health, val);
993 break;
994 case POWER_SUPPLY_PROP_MANUFACTURER:
995 val->strval = BQ27XXX_MANUFACTURER;
996 break;
997 default:
998 return -EINVAL;
999 }
1000
1001 return ret;
1002 }
1003
bq27xxx_external_power_changed(struct power_supply * psy)1004 static void bq27xxx_external_power_changed(struct power_supply *psy)
1005 {
1006 struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
1007
1008 cancel_delayed_work_sync(&di->work);
1009 schedule_delayed_work(&di->work, 0);
1010 }
1011
bq27xxx_battery_setup(struct bq27xxx_device_info * di)1012 int bq27xxx_battery_setup(struct bq27xxx_device_info *di)
1013 {
1014 struct power_supply_desc *psy_desc;
1015 struct power_supply_config psy_cfg = { .drv_data = di, };
1016
1017 INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
1018 mutex_init(&di->lock);
1019 di->regs = bq27xxx_regs[di->chip];
1020
1021 psy_desc = devm_kzalloc(di->dev, sizeof(*psy_desc), GFP_KERNEL);
1022 if (!psy_desc)
1023 return -ENOMEM;
1024
1025 psy_desc->name = di->name;
1026 psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
1027 psy_desc->properties = bq27xxx_battery_props[di->chip].props;
1028 psy_desc->num_properties = bq27xxx_battery_props[di->chip].size;
1029 psy_desc->get_property = bq27xxx_battery_get_property;
1030 psy_desc->external_power_changed = bq27xxx_external_power_changed;
1031
1032 di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
1033 if (IS_ERR(di->bat)) {
1034 dev_err(di->dev, "failed to register battery\n");
1035 return PTR_ERR(di->bat);
1036 }
1037
1038 dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
1039
1040 bq27xxx_battery_update(di);
1041
1042 mutex_lock(&bq27xxx_list_lock);
1043 list_add(&di->list, &bq27xxx_battery_devices);
1044 mutex_unlock(&bq27xxx_list_lock);
1045
1046 return 0;
1047 }
1048 EXPORT_SYMBOL_GPL(bq27xxx_battery_setup);
1049
bq27xxx_battery_teardown(struct bq27xxx_device_info * di)1050 void bq27xxx_battery_teardown(struct bq27xxx_device_info *di)
1051 {
1052 /*
1053 * power_supply_unregister call bq27xxx_battery_get_property which
1054 * call bq27xxx_battery_poll.
1055 * Make sure that bq27xxx_battery_poll will not call
1056 * schedule_delayed_work again after unregister (which cause OOPS).
1057 */
1058 poll_interval = 0;
1059
1060 cancel_delayed_work_sync(&di->work);
1061
1062 power_supply_unregister(di->bat);
1063
1064 mutex_lock(&bq27xxx_list_lock);
1065 list_del(&di->list);
1066 mutex_unlock(&bq27xxx_list_lock);
1067
1068 mutex_destroy(&di->lock);
1069 }
1070 EXPORT_SYMBOL_GPL(bq27xxx_battery_teardown);
1071
bq27xxx_battery_platform_read(struct bq27xxx_device_info * di,u8 reg,bool single)1072 static int bq27xxx_battery_platform_read(struct bq27xxx_device_info *di, u8 reg,
1073 bool single)
1074 {
1075 struct device *dev = di->dev;
1076 struct bq27xxx_platform_data *pdata = dev->platform_data;
1077 unsigned int timeout = 3;
1078 int upper, lower;
1079 int temp;
1080
1081 if (!single) {
1082 /* Make sure the value has not changed in between reading the
1083 * lower and the upper part */
1084 upper = pdata->read(dev, reg + 1);
1085 do {
1086 temp = upper;
1087 if (upper < 0)
1088 return upper;
1089
1090 lower = pdata->read(dev, reg);
1091 if (lower < 0)
1092 return lower;
1093
1094 upper = pdata->read(dev, reg + 1);
1095 } while (temp != upper && --timeout);
1096
1097 if (timeout == 0)
1098 return -EIO;
1099
1100 return (upper << 8) | lower;
1101 }
1102
1103 return pdata->read(dev, reg);
1104 }
1105
bq27xxx_battery_platform_probe(struct platform_device * pdev)1106 static int bq27xxx_battery_platform_probe(struct platform_device *pdev)
1107 {
1108 struct bq27xxx_device_info *di;
1109 struct bq27xxx_platform_data *pdata = pdev->dev.platform_data;
1110
1111 if (!pdata) {
1112 dev_err(&pdev->dev, "no platform_data supplied\n");
1113 return -EINVAL;
1114 }
1115
1116 if (!pdata->read) {
1117 dev_err(&pdev->dev, "no hdq read callback supplied\n");
1118 return -EINVAL;
1119 }
1120
1121 if (!pdata->chip) {
1122 dev_err(&pdev->dev, "no device supplied\n");
1123 return -EINVAL;
1124 }
1125
1126 di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1127 if (!di)
1128 return -ENOMEM;
1129
1130 platform_set_drvdata(pdev, di);
1131
1132 di->dev = &pdev->dev;
1133 di->chip = pdata->chip;
1134 di->name = pdata->name ?: dev_name(&pdev->dev);
1135 di->bus.read = bq27xxx_battery_platform_read;
1136
1137 return bq27xxx_battery_setup(di);
1138 }
1139
bq27xxx_battery_platform_remove(struct platform_device * pdev)1140 static int bq27xxx_battery_platform_remove(struct platform_device *pdev)
1141 {
1142 struct bq27xxx_device_info *di = platform_get_drvdata(pdev);
1143
1144 bq27xxx_battery_teardown(di);
1145
1146 return 0;
1147 }
1148
1149 static const struct platform_device_id bq27xxx_battery_platform_id_table[] = {
1150 { "bq27000-battery", },
1151 { /* sentinel */ }
1152 };
1153 MODULE_DEVICE_TABLE(platform, bq27xxx_battery_platform_id_table);
1154
1155 #ifdef CONFIG_OF
1156 static const struct of_device_id bq27xxx_battery_platform_of_match_table[] = {
1157 { .compatible = "ti,bq27000" },
1158 {},
1159 };
1160 MODULE_DEVICE_TABLE(of, bq27xxx_battery_platform_of_match_table);
1161 #endif
1162
1163 static struct platform_driver bq27xxx_battery_platform_driver = {
1164 .probe = bq27xxx_battery_platform_probe,
1165 .remove = bq27xxx_battery_platform_remove,
1166 .driver = {
1167 .name = "bq27000-battery",
1168 .of_match_table = of_match_ptr(bq27xxx_battery_platform_of_match_table),
1169 },
1170 .id_table = bq27xxx_battery_platform_id_table,
1171 };
1172 module_platform_driver(bq27xxx_battery_platform_driver);
1173
1174 MODULE_ALIAS("platform:bq27000-battery");
1175
1176 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1177 MODULE_DESCRIPTION("BQ27xxx battery monitor driver");
1178 MODULE_LICENSE("GPL");
1179