Merge tag 'for-v4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power...
[sfrench/cifs-2.6.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
86 enum bq27xxx_reg_index {
87         BQ27XXX_REG_CTRL = 0,   /* Control */
88         BQ27XXX_REG_TEMP,       /* Temperature */
89         BQ27XXX_REG_INT_TEMP,   /* Internal Temperature */
90         BQ27XXX_REG_VOLT,       /* Voltage */
91         BQ27XXX_REG_AI,         /* Average Current */
92         BQ27XXX_REG_FLAGS,      /* Flags */
93         BQ27XXX_REG_TTE,        /* Time-to-Empty */
94         BQ27XXX_REG_TTF,        /* Time-to-Full */
95         BQ27XXX_REG_TTES,       /* Time-to-Empty Standby */
96         BQ27XXX_REG_TTECP,      /* Time-to-Empty at Constant Power */
97         BQ27XXX_REG_NAC,        /* Nominal Available Capacity */
98         BQ27XXX_REG_FCC,        /* Full Charge Capacity */
99         BQ27XXX_REG_CYCT,       /* Cycle Count */
100         BQ27XXX_REG_AE,         /* Available Energy */
101         BQ27XXX_REG_SOC,        /* State-of-Charge */
102         BQ27XXX_REG_DCAP,       /* Design Capacity */
103         BQ27XXX_REG_AP,         /* Average Power */
104         BQ27XXX_REG_MAX,        /* sentinel */
105 };
106
107 /* Register mappings */
108 static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
109         [BQ27000] = {
110                 [BQ27XXX_REG_CTRL] = 0x00,
111                 [BQ27XXX_REG_TEMP] = 0x06,
112                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
113                 [BQ27XXX_REG_VOLT] = 0x08,
114                 [BQ27XXX_REG_AI] = 0x14,
115                 [BQ27XXX_REG_FLAGS] = 0x0a,
116                 [BQ27XXX_REG_TTE] = 0x16,
117                 [BQ27XXX_REG_TTF] = 0x18,
118                 [BQ27XXX_REG_TTES] = 0x1c,
119                 [BQ27XXX_REG_TTECP] = 0x26,
120                 [BQ27XXX_REG_NAC] = 0x0c,
121                 [BQ27XXX_REG_FCC] = 0x12,
122                 [BQ27XXX_REG_CYCT] = 0x2a,
123                 [BQ27XXX_REG_AE] = 0x22,
124                 [BQ27XXX_REG_SOC] = 0x0b,
125                 [BQ27XXX_REG_DCAP] = 0x76,
126                 [BQ27XXX_REG_AP] = 0x24,
127         },
128         [BQ27010] = {
129                 [BQ27XXX_REG_CTRL] = 0x00,
130                 [BQ27XXX_REG_TEMP] = 0x06,
131                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
132                 [BQ27XXX_REG_VOLT] = 0x08,
133                 [BQ27XXX_REG_AI] = 0x14,
134                 [BQ27XXX_REG_FLAGS] = 0x0a,
135                 [BQ27XXX_REG_TTE] = 0x16,
136                 [BQ27XXX_REG_TTF] = 0x18,
137                 [BQ27XXX_REG_TTES] = 0x1c,
138                 [BQ27XXX_REG_TTECP] = 0x26,
139                 [BQ27XXX_REG_NAC] = 0x0c,
140                 [BQ27XXX_REG_FCC] = 0x12,
141                 [BQ27XXX_REG_CYCT] = 0x2a,
142                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
143                 [BQ27XXX_REG_SOC] = 0x0b,
144                 [BQ27XXX_REG_DCAP] = 0x76,
145                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
146         },
147         [BQ27500] = {
148                 [BQ27XXX_REG_CTRL] = 0x00,
149                 [BQ27XXX_REG_TEMP] = 0x06,
150                 [BQ27XXX_REG_INT_TEMP] = 0x28,
151                 [BQ27XXX_REG_VOLT] = 0x08,
152                 [BQ27XXX_REG_AI] = 0x14,
153                 [BQ27XXX_REG_FLAGS] = 0x0a,
154                 [BQ27XXX_REG_TTE] = 0x16,
155                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
156                 [BQ27XXX_REG_TTES] = 0x1a,
157                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
158                 [BQ27XXX_REG_NAC] = 0x0c,
159                 [BQ27XXX_REG_FCC] = 0x12,
160                 [BQ27XXX_REG_CYCT] = 0x2a,
161                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
162                 [BQ27XXX_REG_SOC] = 0x2c,
163                 [BQ27XXX_REG_DCAP] = 0x3c,
164                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
165         },
166         [BQ27530] = {
167                 [BQ27XXX_REG_CTRL] = 0x00,
168                 [BQ27XXX_REG_TEMP] = 0x06,
169                 [BQ27XXX_REG_INT_TEMP] = 0x32,
170                 [BQ27XXX_REG_VOLT] = 0x08,
171                 [BQ27XXX_REG_AI] = 0x14,
172                 [BQ27XXX_REG_FLAGS] = 0x0a,
173                 [BQ27XXX_REG_TTE] = 0x16,
174                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
175                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
176                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
177                 [BQ27XXX_REG_NAC] = 0x0c,
178                 [BQ27XXX_REG_FCC] = 0x12,
179                 [BQ27XXX_REG_CYCT] = 0x2a,
180                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
181                 [BQ27XXX_REG_SOC] = 0x2c,
182                 [BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
183                 [BQ27XXX_REG_AP] = 0x24,
184         },
185         [BQ27541] = {
186                 [BQ27XXX_REG_CTRL] = 0x00,
187                 [BQ27XXX_REG_TEMP] = 0x06,
188                 [BQ27XXX_REG_INT_TEMP] = 0x28,
189                 [BQ27XXX_REG_VOLT] = 0x08,
190                 [BQ27XXX_REG_AI] = 0x14,
191                 [BQ27XXX_REG_FLAGS] = 0x0a,
192                 [BQ27XXX_REG_TTE] = 0x16,
193                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
194                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
195                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
196                 [BQ27XXX_REG_NAC] = 0x0c,
197                 [BQ27XXX_REG_FCC] = 0x12,
198                 [BQ27XXX_REG_CYCT] = 0x2a,
199                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
200                 [BQ27XXX_REG_SOC] = 0x2c,
201                 [BQ27XXX_REG_DCAP] = 0x3c,
202                 [BQ27XXX_REG_AP] = 0x24,
203         },
204         [BQ27545] = {
205                 [BQ27XXX_REG_CTRL] = 0x00,
206                 [BQ27XXX_REG_TEMP] = 0x06,
207                 [BQ27XXX_REG_INT_TEMP] = 0x28,
208                 [BQ27XXX_REG_VOLT] = 0x08,
209                 [BQ27XXX_REG_AI] = 0x14,
210                 [BQ27XXX_REG_FLAGS] = 0x0a,
211                 [BQ27XXX_REG_TTE] = 0x16,
212                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
213                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
214                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
215                 [BQ27XXX_REG_NAC] = 0x0c,
216                 [BQ27XXX_REG_FCC] = 0x12,
217                 [BQ27XXX_REG_CYCT] = 0x2a,
218                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
219                 [BQ27XXX_REG_SOC] = 0x2c,
220                 [BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
221                 [BQ27XXX_REG_AP] = 0x24,
222         },
223         [BQ27421] = {
224                 [BQ27XXX_REG_CTRL] = 0x00,
225                 [BQ27XXX_REG_TEMP] = 0x02,
226                 [BQ27XXX_REG_INT_TEMP] = 0x1e,
227                 [BQ27XXX_REG_VOLT] = 0x04,
228                 [BQ27XXX_REG_AI] = 0x10,
229                 [BQ27XXX_REG_FLAGS] = 0x06,
230                 [BQ27XXX_REG_TTE] = INVALID_REG_ADDR,
231                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
232                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
233                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
234                 [BQ27XXX_REG_NAC] = 0x08,
235                 [BQ27XXX_REG_FCC] = 0x0e,
236                 [BQ27XXX_REG_CYCT] = INVALID_REG_ADDR,
237                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
238                 [BQ27XXX_REG_SOC] = 0x1c,
239                 [BQ27XXX_REG_DCAP] = 0x3c,
240                 [BQ27XXX_REG_AP] = 0x18,
241         },
242 };
243
244 static enum power_supply_property bq27000_battery_props[] = {
245         POWER_SUPPLY_PROP_STATUS,
246         POWER_SUPPLY_PROP_PRESENT,
247         POWER_SUPPLY_PROP_VOLTAGE_NOW,
248         POWER_SUPPLY_PROP_CURRENT_NOW,
249         POWER_SUPPLY_PROP_CAPACITY,
250         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
251         POWER_SUPPLY_PROP_TEMP,
252         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
253         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
254         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
255         POWER_SUPPLY_PROP_TECHNOLOGY,
256         POWER_SUPPLY_PROP_CHARGE_FULL,
257         POWER_SUPPLY_PROP_CHARGE_NOW,
258         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
259         POWER_SUPPLY_PROP_CYCLE_COUNT,
260         POWER_SUPPLY_PROP_ENERGY_NOW,
261         POWER_SUPPLY_PROP_POWER_AVG,
262         POWER_SUPPLY_PROP_HEALTH,
263         POWER_SUPPLY_PROP_MANUFACTURER,
264 };
265
266 static enum power_supply_property bq27010_battery_props[] = {
267         POWER_SUPPLY_PROP_STATUS,
268         POWER_SUPPLY_PROP_PRESENT,
269         POWER_SUPPLY_PROP_VOLTAGE_NOW,
270         POWER_SUPPLY_PROP_CURRENT_NOW,
271         POWER_SUPPLY_PROP_CAPACITY,
272         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
273         POWER_SUPPLY_PROP_TEMP,
274         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
275         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
276         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
277         POWER_SUPPLY_PROP_TECHNOLOGY,
278         POWER_SUPPLY_PROP_CHARGE_FULL,
279         POWER_SUPPLY_PROP_CHARGE_NOW,
280         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
281         POWER_SUPPLY_PROP_CYCLE_COUNT,
282         POWER_SUPPLY_PROP_HEALTH,
283         POWER_SUPPLY_PROP_MANUFACTURER,
284 };
285
286 static enum power_supply_property bq27500_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_TECHNOLOGY,
296         POWER_SUPPLY_PROP_CHARGE_FULL,
297         POWER_SUPPLY_PROP_CHARGE_NOW,
298         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
299         POWER_SUPPLY_PROP_CYCLE_COUNT,
300         POWER_SUPPLY_PROP_HEALTH,
301         POWER_SUPPLY_PROP_MANUFACTURER,
302 };
303
304 static enum power_supply_property bq27530_battery_props[] = {
305         POWER_SUPPLY_PROP_STATUS,
306         POWER_SUPPLY_PROP_PRESENT,
307         POWER_SUPPLY_PROP_VOLTAGE_NOW,
308         POWER_SUPPLY_PROP_CURRENT_NOW,
309         POWER_SUPPLY_PROP_CAPACITY,
310         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
311         POWER_SUPPLY_PROP_TEMP,
312         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
313         POWER_SUPPLY_PROP_TECHNOLOGY,
314         POWER_SUPPLY_PROP_CHARGE_FULL,
315         POWER_SUPPLY_PROP_CHARGE_NOW,
316         POWER_SUPPLY_PROP_POWER_AVG,
317         POWER_SUPPLY_PROP_HEALTH,
318         POWER_SUPPLY_PROP_CYCLE_COUNT,
319         POWER_SUPPLY_PROP_MANUFACTURER,
320 };
321
322 static enum power_supply_property bq27541_battery_props[] = {
323         POWER_SUPPLY_PROP_STATUS,
324         POWER_SUPPLY_PROP_PRESENT,
325         POWER_SUPPLY_PROP_VOLTAGE_NOW,
326         POWER_SUPPLY_PROP_CURRENT_NOW,
327         POWER_SUPPLY_PROP_CAPACITY,
328         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
329         POWER_SUPPLY_PROP_TEMP,
330         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
331         POWER_SUPPLY_PROP_TECHNOLOGY,
332         POWER_SUPPLY_PROP_CHARGE_FULL,
333         POWER_SUPPLY_PROP_CHARGE_NOW,
334         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
335         POWER_SUPPLY_PROP_CYCLE_COUNT,
336         POWER_SUPPLY_PROP_POWER_AVG,
337         POWER_SUPPLY_PROP_HEALTH,
338         POWER_SUPPLY_PROP_MANUFACTURER,
339 };
340
341 static enum power_supply_property bq27545_battery_props[] = {
342         POWER_SUPPLY_PROP_STATUS,
343         POWER_SUPPLY_PROP_PRESENT,
344         POWER_SUPPLY_PROP_VOLTAGE_NOW,
345         POWER_SUPPLY_PROP_CURRENT_NOW,
346         POWER_SUPPLY_PROP_CAPACITY,
347         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
348         POWER_SUPPLY_PROP_TEMP,
349         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
350         POWER_SUPPLY_PROP_TECHNOLOGY,
351         POWER_SUPPLY_PROP_CHARGE_FULL,
352         POWER_SUPPLY_PROP_CHARGE_NOW,
353         POWER_SUPPLY_PROP_HEALTH,
354         POWER_SUPPLY_PROP_CYCLE_COUNT,
355         POWER_SUPPLY_PROP_POWER_AVG,
356         POWER_SUPPLY_PROP_MANUFACTURER,
357 };
358
359 static enum power_supply_property bq27421_battery_props[] = {
360         POWER_SUPPLY_PROP_STATUS,
361         POWER_SUPPLY_PROP_PRESENT,
362         POWER_SUPPLY_PROP_VOLTAGE_NOW,
363         POWER_SUPPLY_PROP_CURRENT_NOW,
364         POWER_SUPPLY_PROP_CAPACITY,
365         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
366         POWER_SUPPLY_PROP_TEMP,
367         POWER_SUPPLY_PROP_TECHNOLOGY,
368         POWER_SUPPLY_PROP_CHARGE_FULL,
369         POWER_SUPPLY_PROP_CHARGE_NOW,
370         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
371         POWER_SUPPLY_PROP_MANUFACTURER,
372 };
373
374 #define BQ27XXX_PROP(_id, _prop)                \
375         [_id] = {                               \
376                 .props = _prop,                 \
377                 .size = ARRAY_SIZE(_prop),      \
378         }
379
380 static struct {
381         enum power_supply_property *props;
382         size_t size;
383 } bq27xxx_battery_props[] = {
384         BQ27XXX_PROP(BQ27000, bq27000_battery_props),
385         BQ27XXX_PROP(BQ27010, bq27010_battery_props),
386         BQ27XXX_PROP(BQ27500, bq27500_battery_props),
387         BQ27XXX_PROP(BQ27530, bq27530_battery_props),
388         BQ27XXX_PROP(BQ27541, bq27541_battery_props),
389         BQ27XXX_PROP(BQ27545, bq27545_battery_props),
390         BQ27XXX_PROP(BQ27421, bq27421_battery_props),
391 };
392
393 static unsigned int poll_interval = 360;
394 module_param(poll_interval, uint, 0644);
395 MODULE_PARM_DESC(poll_interval,
396                  "battery poll interval in seconds - 0 disables polling");
397
398 /*
399  * Common code for BQ27xxx devices
400  */
401
402 static inline int bq27xxx_read(struct bq27xxx_device_info *di, int reg_index,
403                                bool single)
404 {
405         /* Reports EINVAL for invalid/missing registers */
406         if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
407                 return -EINVAL;
408
409         return di->bus.read(di, di->regs[reg_index], single);
410 }
411
412 /*
413  * Return the battery State-of-Charge
414  * Or < 0 if something fails.
415  */
416 static int bq27xxx_battery_read_soc(struct bq27xxx_device_info *di)
417 {
418         int soc;
419
420         if (di->chip == BQ27000 || di->chip == BQ27010)
421                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, true);
422         else
423                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
424
425         if (soc < 0)
426                 dev_dbg(di->dev, "error reading State-of-Charge\n");
427
428         return soc;
429 }
430
431 /*
432  * Return a battery charge value in µAh
433  * Or < 0 if something fails.
434  */
435 static int bq27xxx_battery_read_charge(struct bq27xxx_device_info *di, u8 reg)
436 {
437         int charge;
438
439         charge = bq27xxx_read(di, reg, false);
440         if (charge < 0) {
441                 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
442                         reg, charge);
443                 return charge;
444         }
445
446         if (di->chip == BQ27000 || di->chip == BQ27010)
447                 charge *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
448         else
449                 charge *= 1000;
450
451         return charge;
452 }
453
454 /*
455  * Return the battery Nominal available capacity in µAh
456  * Or < 0 if something fails.
457  */
458 static inline int bq27xxx_battery_read_nac(struct bq27xxx_device_info *di)
459 {
460         int flags;
461
462         if (di->chip == BQ27000 || di->chip == BQ27010) {
463                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
464                 if (flags >= 0 && (flags & BQ27000_FLAG_CI))
465                         return -ENODATA;
466         }
467
468         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_NAC);
469 }
470
471 /*
472  * Return the battery Full Charge Capacity in µAh
473  * Or < 0 if something fails.
474  */
475 static inline int bq27xxx_battery_read_fcc(struct bq27xxx_device_info *di)
476 {
477         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_FCC);
478 }
479
480 /*
481  * Return the Design Capacity in µAh
482  * Or < 0 if something fails.
483  */
484 static int bq27xxx_battery_read_dcap(struct bq27xxx_device_info *di)
485 {
486         int dcap;
487
488         if (di->chip == BQ27000 || di->chip == BQ27010)
489                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, true);
490         else
491                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
492
493         if (dcap < 0) {
494                 dev_dbg(di->dev, "error reading initial last measured discharge\n");
495                 return dcap;
496         }
497
498         if (di->chip == BQ27000 || di->chip == BQ27010)
499                 dcap = (dcap << 8) * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
500         else
501                 dcap *= 1000;
502
503         return dcap;
504 }
505
506 /*
507  * Return the battery Available energy in µWh
508  * Or < 0 if something fails.
509  */
510 static int bq27xxx_battery_read_energy(struct bq27xxx_device_info *di)
511 {
512         int ae;
513
514         ae = bq27xxx_read(di, BQ27XXX_REG_AE, false);
515         if (ae < 0) {
516                 dev_dbg(di->dev, "error reading available energy\n");
517                 return ae;
518         }
519
520         if (di->chip == BQ27000 || di->chip == BQ27010)
521                 ae *= BQ27XXX_POWER_CONSTANT / BQ27XXX_RS;
522         else
523                 ae *= 1000;
524
525         return ae;
526 }
527
528 /*
529  * Return the battery temperature in tenths of degree Kelvin
530  * Or < 0 if something fails.
531  */
532 static int bq27xxx_battery_read_temperature(struct bq27xxx_device_info *di)
533 {
534         int temp;
535
536         temp = bq27xxx_read(di, BQ27XXX_REG_TEMP, false);
537         if (temp < 0) {
538                 dev_err(di->dev, "error reading temperature\n");
539                 return temp;
540         }
541
542         if (di->chip == BQ27000 || di->chip == BQ27010)
543                 temp = 5 * temp / 2;
544
545         return temp;
546 }
547
548 /*
549  * Return the battery Cycle count total
550  * Or < 0 if something fails.
551  */
552 static int bq27xxx_battery_read_cyct(struct bq27xxx_device_info *di)
553 {
554         int cyct;
555
556         cyct = bq27xxx_read(di, BQ27XXX_REG_CYCT, false);
557         if (cyct < 0)
558                 dev_err(di->dev, "error reading cycle count total\n");
559
560         return cyct;
561 }
562
563 /*
564  * Read a time register.
565  * Return < 0 if something fails.
566  */
567 static int bq27xxx_battery_read_time(struct bq27xxx_device_info *di, u8 reg)
568 {
569         int tval;
570
571         tval = bq27xxx_read(di, reg, false);
572         if (tval < 0) {
573                 dev_dbg(di->dev, "error reading time register %02x: %d\n",
574                         reg, tval);
575                 return tval;
576         }
577
578         if (tval == 65535)
579                 return -ENODATA;
580
581         return tval * 60;
582 }
583
584 /*
585  * Read an average power register.
586  * Return < 0 if something fails.
587  */
588 static int bq27xxx_battery_read_pwr_avg(struct bq27xxx_device_info *di)
589 {
590         int tval;
591
592         tval = bq27xxx_read(di, BQ27XXX_REG_AP, false);
593         if (tval < 0) {
594                 dev_err(di->dev, "error reading average power register  %02x: %d\n",
595                         BQ27XXX_REG_AP, tval);
596                 return tval;
597         }
598
599         if (di->chip == BQ27000 || di->chip == BQ27010)
600                 return (tval * BQ27XXX_POWER_CONSTANT) / BQ27XXX_RS;
601         else
602                 return tval;
603 }
604
605 /*
606  * Returns true if a battery over temperature condition is detected
607  */
608 static bool bq27xxx_battery_overtemp(struct bq27xxx_device_info *di, u16 flags)
609 {
610         if (di->chip == BQ27500 || di->chip == BQ27541 || di->chip == BQ27545)
611                 return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD);
612         if (di->chip == BQ27530 || di->chip == BQ27421)
613                 return flags & BQ27XXX_FLAG_OT;
614
615         return false;
616 }
617
618 /*
619  * Returns true if a battery under temperature condition is detected
620  */
621 static bool bq27xxx_battery_undertemp(struct bq27xxx_device_info *di, u16 flags)
622 {
623         if (di->chip == BQ27530 || di->chip == BQ27421)
624                 return flags & BQ27XXX_FLAG_UT;
625
626         return false;
627 }
628
629 /*
630  * Returns true if a low state of charge condition is detected
631  */
632 static bool bq27xxx_battery_dead(struct bq27xxx_device_info *di, u16 flags)
633 {
634         if (di->chip == BQ27000 || di->chip == BQ27010)
635                 return flags & (BQ27000_FLAG_EDV1 | BQ27000_FLAG_EDVF);
636         else
637                 return flags & (BQ27XXX_FLAG_SOC1 | BQ27XXX_FLAG_SOCF);
638 }
639
640 /*
641  * Read flag register.
642  * Return < 0 if something fails.
643  */
644 static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di)
645 {
646         int flags;
647
648         flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
649         if (flags < 0) {
650                 dev_err(di->dev, "error reading flag register:%d\n", flags);
651                 return flags;
652         }
653
654         /* Unlikely but important to return first */
655         if (unlikely(bq27xxx_battery_overtemp(di, flags)))
656                 return POWER_SUPPLY_HEALTH_OVERHEAT;
657         if (unlikely(bq27xxx_battery_undertemp(di, flags)))
658                 return POWER_SUPPLY_HEALTH_COLD;
659         if (unlikely(bq27xxx_battery_dead(di, flags)))
660                 return POWER_SUPPLY_HEALTH_DEAD;
661
662         return POWER_SUPPLY_HEALTH_GOOD;
663 }
664
665 void bq27xxx_battery_update(struct bq27xxx_device_info *di)
666 {
667         struct bq27xxx_reg_cache cache = {0, };
668         bool has_ci_flag = di->chip == BQ27000 || di->chip == BQ27010;
669         bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
670
671         cache.flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
672         if ((cache.flags & 0xff) == 0xff)
673                 cache.flags = -1; /* read error */
674         if (cache.flags >= 0) {
675                 cache.temperature = bq27xxx_battery_read_temperature(di);
676                 if (has_ci_flag && (cache.flags & BQ27000_FLAG_CI)) {
677                         dev_info_once(di->dev, "battery is not calibrated! ignoring capacity values\n");
678                         cache.capacity = -ENODATA;
679                         cache.energy = -ENODATA;
680                         cache.time_to_empty = -ENODATA;
681                         cache.time_to_empty_avg = -ENODATA;
682                         cache.time_to_full = -ENODATA;
683                         cache.charge_full = -ENODATA;
684                         cache.health = -ENODATA;
685                 } else {
686                         if (di->regs[BQ27XXX_REG_TTE] != INVALID_REG_ADDR)
687                                 cache.time_to_empty = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTE);
688                         if (di->regs[BQ27XXX_REG_TTECP] != INVALID_REG_ADDR)
689                                 cache.time_to_empty_avg = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTECP);
690                         if (di->regs[BQ27XXX_REG_TTF] != INVALID_REG_ADDR)
691                                 cache.time_to_full = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTF);
692                         cache.charge_full = bq27xxx_battery_read_fcc(di);
693                         cache.capacity = bq27xxx_battery_read_soc(di);
694                         if (di->regs[BQ27XXX_REG_AE] != INVALID_REG_ADDR)
695                                 cache.energy = bq27xxx_battery_read_energy(di);
696                         cache.health = bq27xxx_battery_read_health(di);
697                 }
698                 if (di->regs[BQ27XXX_REG_CYCT] != INVALID_REG_ADDR)
699                         cache.cycle_count = bq27xxx_battery_read_cyct(di);
700                 if (di->regs[BQ27XXX_REG_AP] != INVALID_REG_ADDR)
701                         cache.power_avg = bq27xxx_battery_read_pwr_avg(di);
702
703                 /* We only have to read charge design full once */
704                 if (di->charge_design_full <= 0)
705                         di->charge_design_full = bq27xxx_battery_read_dcap(di);
706         }
707
708         if (di->cache.capacity != cache.capacity)
709                 power_supply_changed(di->bat);
710
711         if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
712                 di->cache = cache;
713
714         di->last_update = jiffies;
715 }
716 EXPORT_SYMBOL_GPL(bq27xxx_battery_update);
717
718 static void bq27xxx_battery_poll(struct work_struct *work)
719 {
720         struct bq27xxx_device_info *di =
721                         container_of(work, struct bq27xxx_device_info,
722                                      work.work);
723
724         bq27xxx_battery_update(di);
725
726         if (poll_interval > 0)
727                 schedule_delayed_work(&di->work, poll_interval * HZ);
728 }
729
730 /*
731  * Return the battery average current in µA
732  * Note that current can be negative signed as well
733  * Or 0 if something fails.
734  */
735 static int bq27xxx_battery_current(struct bq27xxx_device_info *di,
736                                    union power_supply_propval *val)
737 {
738         int curr;
739         int flags;
740
741         curr = bq27xxx_read(di, BQ27XXX_REG_AI, false);
742         if (curr < 0) {
743                 dev_err(di->dev, "error reading current\n");
744                 return curr;
745         }
746
747         if (di->chip == BQ27000 || di->chip == BQ27010) {
748                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
749                 if (flags & BQ27000_FLAG_CHGS) {
750                         dev_dbg(di->dev, "negative current!\n");
751                         curr = -curr;
752                 }
753
754                 val->intval = curr * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
755         } else {
756                 /* Other gauges return signed value */
757                 val->intval = (int)((s16)curr) * 1000;
758         }
759
760         return 0;
761 }
762
763 static int bq27xxx_battery_status(struct bq27xxx_device_info *di,
764                                   union power_supply_propval *val)
765 {
766         int status;
767
768         if (di->chip == BQ27000 || di->chip == BQ27010) {
769                 if (di->cache.flags & BQ27000_FLAG_FC)
770                         status = POWER_SUPPLY_STATUS_FULL;
771                 else if (di->cache.flags & BQ27000_FLAG_CHGS)
772                         status = POWER_SUPPLY_STATUS_CHARGING;
773                 else if (power_supply_am_i_supplied(di->bat))
774                         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
775                 else
776                         status = POWER_SUPPLY_STATUS_DISCHARGING;
777         } else {
778                 if (di->cache.flags & BQ27XXX_FLAG_FC)
779                         status = POWER_SUPPLY_STATUS_FULL;
780                 else if (di->cache.flags & BQ27XXX_FLAG_DSC)
781                         status = POWER_SUPPLY_STATUS_DISCHARGING;
782                 else
783                         status = POWER_SUPPLY_STATUS_CHARGING;
784         }
785
786         val->intval = status;
787
788         return 0;
789 }
790
791 static int bq27xxx_battery_capacity_level(struct bq27xxx_device_info *di,
792                                           union power_supply_propval *val)
793 {
794         int level;
795
796         if (di->chip == BQ27000 || di->chip == BQ27010) {
797                 if (di->cache.flags & BQ27000_FLAG_FC)
798                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
799                 else if (di->cache.flags & BQ27000_FLAG_EDV1)
800                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
801                 else if (di->cache.flags & BQ27000_FLAG_EDVF)
802                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
803                 else
804                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
805         } else {
806                 if (di->cache.flags & BQ27XXX_FLAG_FC)
807                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
808                 else if (di->cache.flags & BQ27XXX_FLAG_SOC1)
809                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
810                 else if (di->cache.flags & BQ27XXX_FLAG_SOCF)
811                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
812                 else
813                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
814         }
815
816         val->intval = level;
817
818         return 0;
819 }
820
821 /*
822  * Return the battery Voltage in millivolts
823  * Or < 0 if something fails.
824  */
825 static int bq27xxx_battery_voltage(struct bq27xxx_device_info *di,
826                                    union power_supply_propval *val)
827 {
828         int volt;
829
830         volt = bq27xxx_read(di, BQ27XXX_REG_VOLT, false);
831         if (volt < 0) {
832                 dev_err(di->dev, "error reading voltage\n");
833                 return volt;
834         }
835
836         val->intval = volt * 1000;
837
838         return 0;
839 }
840
841 static int bq27xxx_simple_value(int value,
842                                 union power_supply_propval *val)
843 {
844         if (value < 0)
845                 return value;
846
847         val->intval = value;
848
849         return 0;
850 }
851
852 static int bq27xxx_battery_get_property(struct power_supply *psy,
853                                         enum power_supply_property psp,
854                                         union power_supply_propval *val)
855 {
856         int ret = 0;
857         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
858
859         mutex_lock(&di->lock);
860         if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
861                 cancel_delayed_work_sync(&di->work);
862                 bq27xxx_battery_poll(&di->work.work);
863         }
864         mutex_unlock(&di->lock);
865
866         if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
867                 return -ENODEV;
868
869         switch (psp) {
870         case POWER_SUPPLY_PROP_STATUS:
871                 ret = bq27xxx_battery_status(di, val);
872                 break;
873         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
874                 ret = bq27xxx_battery_voltage(di, val);
875                 break;
876         case POWER_SUPPLY_PROP_PRESENT:
877                 val->intval = di->cache.flags < 0 ? 0 : 1;
878                 break;
879         case POWER_SUPPLY_PROP_CURRENT_NOW:
880                 ret = bq27xxx_battery_current(di, val);
881                 break;
882         case POWER_SUPPLY_PROP_CAPACITY:
883                 ret = bq27xxx_simple_value(di->cache.capacity, val);
884                 break;
885         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
886                 ret = bq27xxx_battery_capacity_level(di, val);
887                 break;
888         case POWER_SUPPLY_PROP_TEMP:
889                 ret = bq27xxx_simple_value(di->cache.temperature, val);
890                 if (ret == 0)
891                         val->intval -= 2731; /* convert decidegree k to c */
892                 break;
893         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
894                 ret = bq27xxx_simple_value(di->cache.time_to_empty, val);
895                 break;
896         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
897                 ret = bq27xxx_simple_value(di->cache.time_to_empty_avg, val);
898                 break;
899         case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
900                 ret = bq27xxx_simple_value(di->cache.time_to_full, val);
901                 break;
902         case POWER_SUPPLY_PROP_TECHNOLOGY:
903                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
904                 break;
905         case POWER_SUPPLY_PROP_CHARGE_NOW:
906                 ret = bq27xxx_simple_value(bq27xxx_battery_read_nac(di), val);
907                 break;
908         case POWER_SUPPLY_PROP_CHARGE_FULL:
909                 ret = bq27xxx_simple_value(di->cache.charge_full, val);
910                 break;
911         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
912                 ret = bq27xxx_simple_value(di->charge_design_full, val);
913                 break;
914         case POWER_SUPPLY_PROP_CYCLE_COUNT:
915                 ret = bq27xxx_simple_value(di->cache.cycle_count, val);
916                 break;
917         case POWER_SUPPLY_PROP_ENERGY_NOW:
918                 ret = bq27xxx_simple_value(di->cache.energy, val);
919                 break;
920         case POWER_SUPPLY_PROP_POWER_AVG:
921                 ret = bq27xxx_simple_value(di->cache.power_avg, val);
922                 break;
923         case POWER_SUPPLY_PROP_HEALTH:
924                 ret = bq27xxx_simple_value(di->cache.health, val);
925                 break;
926         case POWER_SUPPLY_PROP_MANUFACTURER:
927                 val->strval = BQ27XXX_MANUFACTURER;
928                 break;
929         default:
930                 return -EINVAL;
931         }
932
933         return ret;
934 }
935
936 static void bq27xxx_external_power_changed(struct power_supply *psy)
937 {
938         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
939
940         cancel_delayed_work_sync(&di->work);
941         schedule_delayed_work(&di->work, 0);
942 }
943
944 int bq27xxx_battery_setup(struct bq27xxx_device_info *di)
945 {
946         struct power_supply_desc *psy_desc;
947         struct power_supply_config psy_cfg = { .drv_data = di, };
948
949         INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
950         mutex_init(&di->lock);
951         di->regs = bq27xxx_regs[di->chip];
952
953         psy_desc = devm_kzalloc(di->dev, sizeof(*psy_desc), GFP_KERNEL);
954         if (!psy_desc)
955                 return -ENOMEM;
956
957         psy_desc->name = di->name;
958         psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
959         psy_desc->properties = bq27xxx_battery_props[di->chip].props;
960         psy_desc->num_properties = bq27xxx_battery_props[di->chip].size;
961         psy_desc->get_property = bq27xxx_battery_get_property;
962         psy_desc->external_power_changed = bq27xxx_external_power_changed;
963
964         di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
965         if (IS_ERR(di->bat)) {
966                 dev_err(di->dev, "failed to register battery\n");
967                 return PTR_ERR(di->bat);
968         }
969
970         dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
971
972         bq27xxx_battery_update(di);
973
974         return 0;
975 }
976 EXPORT_SYMBOL_GPL(bq27xxx_battery_setup);
977
978 void bq27xxx_battery_teardown(struct bq27xxx_device_info *di)
979 {
980         /*
981          * power_supply_unregister call bq27xxx_battery_get_property which
982          * call bq27xxx_battery_poll.
983          * Make sure that bq27xxx_battery_poll will not call
984          * schedule_delayed_work again after unregister (which cause OOPS).
985          */
986         poll_interval = 0;
987
988         cancel_delayed_work_sync(&di->work);
989
990         power_supply_unregister(di->bat);
991
992         mutex_destroy(&di->lock);
993 }
994 EXPORT_SYMBOL_GPL(bq27xxx_battery_teardown);
995
996 static int bq27xxx_battery_platform_read(struct bq27xxx_device_info *di, u8 reg,
997                                          bool single)
998 {
999         struct device *dev = di->dev;
1000         struct bq27xxx_platform_data *pdata = dev->platform_data;
1001         unsigned int timeout = 3;
1002         int upper, lower;
1003         int temp;
1004
1005         if (!single) {
1006                 /* Make sure the value has not changed in between reading the
1007                  * lower and the upper part */
1008                 upper = pdata->read(dev, reg + 1);
1009                 do {
1010                         temp = upper;
1011                         if (upper < 0)
1012                                 return upper;
1013
1014                         lower = pdata->read(dev, reg);
1015                         if (lower < 0)
1016                                 return lower;
1017
1018                         upper = pdata->read(dev, reg + 1);
1019                 } while (temp != upper && --timeout);
1020
1021                 if (timeout == 0)
1022                         return -EIO;
1023
1024                 return (upper << 8) | lower;
1025         }
1026
1027         return pdata->read(dev, reg);
1028 }
1029
1030 static int bq27xxx_battery_platform_probe(struct platform_device *pdev)
1031 {
1032         struct bq27xxx_device_info *di;
1033         struct bq27xxx_platform_data *pdata = pdev->dev.platform_data;
1034
1035         if (!pdata) {
1036                 dev_err(&pdev->dev, "no platform_data supplied\n");
1037                 return -EINVAL;
1038         }
1039
1040         if (!pdata->read) {
1041                 dev_err(&pdev->dev, "no hdq read callback supplied\n");
1042                 return -EINVAL;
1043         }
1044
1045         if (!pdata->chip) {
1046                 dev_err(&pdev->dev, "no device supplied\n");
1047                 return -EINVAL;
1048         }
1049
1050         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1051         if (!di)
1052                 return -ENOMEM;
1053
1054         platform_set_drvdata(pdev, di);
1055
1056         di->dev = &pdev->dev;
1057         di->chip = pdata->chip;
1058         di->name = pdata->name ?: dev_name(&pdev->dev);
1059         di->bus.read = bq27xxx_battery_platform_read;
1060
1061         return bq27xxx_battery_setup(di);
1062 }
1063
1064 static int bq27xxx_battery_platform_remove(struct platform_device *pdev)
1065 {
1066         struct bq27xxx_device_info *di = platform_get_drvdata(pdev);
1067
1068         bq27xxx_battery_teardown(di);
1069
1070         return 0;
1071 }
1072
1073 static const struct platform_device_id bq27xxx_battery_platform_id_table[] = {
1074         { "bq27000-battery", },
1075         { /* sentinel */ }
1076 };
1077 MODULE_DEVICE_TABLE(platform, bq27xxx_battery_platform_id_table);
1078
1079 #ifdef CONFIG_OF
1080 static const struct of_device_id bq27xxx_battery_platform_of_match_table[] = {
1081         { .compatible = "ti,bq27000" },
1082         {},
1083 };
1084 MODULE_DEVICE_TABLE(of, bq27xxx_battery_platform_of_match_table);
1085 #endif
1086
1087 static struct platform_driver bq27xxx_battery_platform_driver = {
1088         .probe  = bq27xxx_battery_platform_probe,
1089         .remove = bq27xxx_battery_platform_remove,
1090         .driver = {
1091                 .name = "bq27000-battery",
1092                 .of_match_table = of_match_ptr(bq27xxx_battery_platform_of_match_table),
1093         },
1094         .id_table = bq27xxx_battery_platform_id_table,
1095 };
1096 module_platform_driver(bq27xxx_battery_platform_driver);
1097
1098 MODULE_ALIAS("platform:bq27000-battery");
1099
1100 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1101 MODULE_DESCRIPTION("BQ27xxx battery monitor driver");
1102 MODULE_LICENSE("GPL");