Merge tag 'nfs-for-4.4-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
[linux-2.6-block.git] / drivers / power / bq2415x_charger.c
1 /*
2  * bq2415x charger driver
3  *
4  * Copyright (C) 2011-2013  Pali Rohár <pali.rohar@gmail.com>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * Datasheets:
17  * http://www.ti.com/product/bq24150
18  * http://www.ti.com/product/bq24150a
19  * http://www.ti.com/product/bq24152
20  * http://www.ti.com/product/bq24153
21  * http://www.ti.com/product/bq24153a
22  * http://www.ti.com/product/bq24155
23  * http://www.ti.com/product/bq24157s
24  * http://www.ti.com/product/bq24158
25  */
26
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/param.h>
30 #include <linux/err.h>
31 #include <linux/workqueue.h>
32 #include <linux/sysfs.h>
33 #include <linux/platform_device.h>
34 #include <linux/power_supply.h>
35 #include <linux/idr.h>
36 #include <linux/i2c.h>
37 #include <linux/slab.h>
38 #include <linux/acpi.h>
39
40 #include <linux/power/bq2415x_charger.h>
41
42 /* timeout for resetting chip timer */
43 #define BQ2415X_TIMER_TIMEOUT           10
44
45 #define BQ2415X_REG_STATUS              0x00
46 #define BQ2415X_REG_CONTROL             0x01
47 #define BQ2415X_REG_VOLTAGE             0x02
48 #define BQ2415X_REG_VENDER              0x03
49 #define BQ2415X_REG_CURRENT             0x04
50
51 /* reset state for all registers */
52 #define BQ2415X_RESET_STATUS            BIT(6)
53 #define BQ2415X_RESET_CONTROL           (BIT(4)|BIT(5))
54 #define BQ2415X_RESET_VOLTAGE           (BIT(1)|BIT(3))
55 #define BQ2415X_RESET_CURRENT           (BIT(0)|BIT(3)|BIT(7))
56
57 /* status register */
58 #define BQ2415X_BIT_TMR_RST             7
59 #define BQ2415X_BIT_OTG                 7
60 #define BQ2415X_BIT_EN_STAT             6
61 #define BQ2415X_MASK_STAT               (BIT(4)|BIT(5))
62 #define BQ2415X_SHIFT_STAT              4
63 #define BQ2415X_BIT_BOOST               3
64 #define BQ2415X_MASK_FAULT              (BIT(0)|BIT(1)|BIT(2))
65 #define BQ2415X_SHIFT_FAULT             0
66
67 /* control register */
68 #define BQ2415X_MASK_LIMIT              (BIT(6)|BIT(7))
69 #define BQ2415X_SHIFT_LIMIT             6
70 #define BQ2415X_MASK_VLOWV              (BIT(4)|BIT(5))
71 #define BQ2415X_SHIFT_VLOWV             4
72 #define BQ2415X_BIT_TE                  3
73 #define BQ2415X_BIT_CE                  2
74 #define BQ2415X_BIT_HZ_MODE             1
75 #define BQ2415X_BIT_OPA_MODE            0
76
77 /* voltage register */
78 #define BQ2415X_MASK_VO         (BIT(2)|BIT(3)|BIT(4)|BIT(5)|BIT(6)|BIT(7))
79 #define BQ2415X_SHIFT_VO                2
80 #define BQ2415X_BIT_OTG_PL              1
81 #define BQ2415X_BIT_OTG_EN              0
82
83 /* vender register */
84 #define BQ2415X_MASK_VENDER             (BIT(5)|BIT(6)|BIT(7))
85 #define BQ2415X_SHIFT_VENDER            5
86 #define BQ2415X_MASK_PN                 (BIT(3)|BIT(4))
87 #define BQ2415X_SHIFT_PN                3
88 #define BQ2415X_MASK_REVISION           (BIT(0)|BIT(1)|BIT(2))
89 #define BQ2415X_SHIFT_REVISION          0
90
91 /* current register */
92 #define BQ2415X_MASK_RESET              BIT(7)
93 #define BQ2415X_MASK_VI_CHRG            (BIT(4)|BIT(5)|BIT(6))
94 #define BQ2415X_SHIFT_VI_CHRG           4
95 /* N/A                                  BIT(3) */
96 #define BQ2415X_MASK_VI_TERM            (BIT(0)|BIT(1)|BIT(2))
97 #define BQ2415X_SHIFT_VI_TERM           0
98
99
100 enum bq2415x_command {
101         BQ2415X_TIMER_RESET,
102         BQ2415X_OTG_STATUS,
103         BQ2415X_STAT_PIN_STATUS,
104         BQ2415X_STAT_PIN_ENABLE,
105         BQ2415X_STAT_PIN_DISABLE,
106         BQ2415X_CHARGE_STATUS,
107         BQ2415X_BOOST_STATUS,
108         BQ2415X_FAULT_STATUS,
109
110         BQ2415X_CHARGE_TERMINATION_STATUS,
111         BQ2415X_CHARGE_TERMINATION_ENABLE,
112         BQ2415X_CHARGE_TERMINATION_DISABLE,
113         BQ2415X_CHARGER_STATUS,
114         BQ2415X_CHARGER_ENABLE,
115         BQ2415X_CHARGER_DISABLE,
116         BQ2415X_HIGH_IMPEDANCE_STATUS,
117         BQ2415X_HIGH_IMPEDANCE_ENABLE,
118         BQ2415X_HIGH_IMPEDANCE_DISABLE,
119         BQ2415X_BOOST_MODE_STATUS,
120         BQ2415X_BOOST_MODE_ENABLE,
121         BQ2415X_BOOST_MODE_DISABLE,
122
123         BQ2415X_OTG_LEVEL,
124         BQ2415X_OTG_ACTIVATE_HIGH,
125         BQ2415X_OTG_ACTIVATE_LOW,
126         BQ2415X_OTG_PIN_STATUS,
127         BQ2415X_OTG_PIN_ENABLE,
128         BQ2415X_OTG_PIN_DISABLE,
129
130         BQ2415X_VENDER_CODE,
131         BQ2415X_PART_NUMBER,
132         BQ2415X_REVISION,
133 };
134
135 enum bq2415x_chip {
136         BQUNKNOWN,
137         BQ24150,
138         BQ24150A,
139         BQ24151,
140         BQ24151A,
141         BQ24152,
142         BQ24153,
143         BQ24153A,
144         BQ24155,
145         BQ24156,
146         BQ24156A,
147         BQ24157S,
148         BQ24158,
149 };
150
151 static char *bq2415x_chip_name[] = {
152         "unknown",
153         "bq24150",
154         "bq24150a",
155         "bq24151",
156         "bq24151a",
157         "bq24152",
158         "bq24153",
159         "bq24153a",
160         "bq24155",
161         "bq24156",
162         "bq24156a",
163         "bq24157s",
164         "bq24158",
165 };
166
167 struct bq2415x_device {
168         struct device *dev;
169         struct bq2415x_platform_data init_data;
170         struct power_supply *charger;
171         struct power_supply_desc charger_desc;
172         struct delayed_work work;
173         struct device_node *notify_node;
174         struct notifier_block nb;
175         enum bq2415x_mode reported_mode;/* mode reported by hook function */
176         enum bq2415x_mode mode;         /* currently configured mode */
177         enum bq2415x_chip chip;
178         const char *timer_error;
179         char *model;
180         char *name;
181         int autotimer;  /* 1 - if driver automatically reset timer, 0 - not */
182         int automode;   /* 1 - enabled, 0 - disabled; -1 - not supported */
183         int id;
184 };
185
186 /* each registered chip must have unique id */
187 static DEFINE_IDR(bq2415x_id);
188
189 static DEFINE_MUTEX(bq2415x_id_mutex);
190 static DEFINE_MUTEX(bq2415x_timer_mutex);
191 static DEFINE_MUTEX(bq2415x_i2c_mutex);
192
193 /**** i2c read functions ****/
194
195 /* read value from register */
196 static int bq2415x_i2c_read(struct bq2415x_device *bq, u8 reg)
197 {
198         struct i2c_client *client = to_i2c_client(bq->dev);
199         struct i2c_msg msg[2];
200         u8 val;
201         int ret;
202
203         if (!client->adapter)
204                 return -ENODEV;
205
206         msg[0].addr = client->addr;
207         msg[0].flags = 0;
208         msg[0].buf = &reg;
209         msg[0].len = sizeof(reg);
210         msg[1].addr = client->addr;
211         msg[1].flags = I2C_M_RD;
212         msg[1].buf = &val;
213         msg[1].len = sizeof(val);
214
215         mutex_lock(&bq2415x_i2c_mutex);
216         ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
217         mutex_unlock(&bq2415x_i2c_mutex);
218
219         if (ret < 0)
220                 return ret;
221
222         return val;
223 }
224
225 /* read value from register, apply mask and right shift it */
226 static int bq2415x_i2c_read_mask(struct bq2415x_device *bq, u8 reg,
227                                  u8 mask, u8 shift)
228 {
229         int ret;
230
231         if (shift > 8)
232                 return -EINVAL;
233
234         ret = bq2415x_i2c_read(bq, reg);
235         if (ret < 0)
236                 return ret;
237         return (ret & mask) >> shift;
238 }
239
240 /* read value from register and return one specified bit */
241 static int bq2415x_i2c_read_bit(struct bq2415x_device *bq, u8 reg, u8 bit)
242 {
243         if (bit > 8)
244                 return -EINVAL;
245         return bq2415x_i2c_read_mask(bq, reg, BIT(bit), bit);
246 }
247
248 /**** i2c write functions ****/
249
250 /* write value to register */
251 static int bq2415x_i2c_write(struct bq2415x_device *bq, u8 reg, u8 val)
252 {
253         struct i2c_client *client = to_i2c_client(bq->dev);
254         struct i2c_msg msg[1];
255         u8 data[2];
256         int ret;
257
258         data[0] = reg;
259         data[1] = val;
260
261         msg[0].addr = client->addr;
262         msg[0].flags = 0;
263         msg[0].buf = data;
264         msg[0].len = ARRAY_SIZE(data);
265
266         mutex_lock(&bq2415x_i2c_mutex);
267         ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
268         mutex_unlock(&bq2415x_i2c_mutex);
269
270         /* i2c_transfer returns number of messages transferred */
271         if (ret < 0)
272                 return ret;
273         else if (ret != 1)
274                 return -EIO;
275
276         return 0;
277 }
278
279 /* read value from register, change it with mask left shifted and write back */
280 static int bq2415x_i2c_write_mask(struct bq2415x_device *bq, u8 reg, u8 val,
281                                   u8 mask, u8 shift)
282 {
283         int ret;
284
285         if (shift > 8)
286                 return -EINVAL;
287
288         ret = bq2415x_i2c_read(bq, reg);
289         if (ret < 0)
290                 return ret;
291
292         ret &= ~mask;
293         ret |= val << shift;
294
295         return bq2415x_i2c_write(bq, reg, ret);
296 }
297
298 /* change only one bit in register */
299 static int bq2415x_i2c_write_bit(struct bq2415x_device *bq, u8 reg,
300                                  bool val, u8 bit)
301 {
302         if (bit > 8)
303                 return -EINVAL;
304         return bq2415x_i2c_write_mask(bq, reg, val, BIT(bit), bit);
305 }
306
307 /**** global functions ****/
308
309 /* exec command function */
310 static int bq2415x_exec_command(struct bq2415x_device *bq,
311                                 enum bq2415x_command command)
312 {
313         int ret;
314
315         switch (command) {
316         case BQ2415X_TIMER_RESET:
317                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS,
318                                 1, BQ2415X_BIT_TMR_RST);
319         case BQ2415X_OTG_STATUS:
320                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS,
321                                 BQ2415X_BIT_OTG);
322         case BQ2415X_STAT_PIN_STATUS:
323                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS,
324                                 BQ2415X_BIT_EN_STAT);
325         case BQ2415X_STAT_PIN_ENABLE:
326                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS, 1,
327                                 BQ2415X_BIT_EN_STAT);
328         case BQ2415X_STAT_PIN_DISABLE:
329                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS, 0,
330                                 BQ2415X_BIT_EN_STAT);
331         case BQ2415X_CHARGE_STATUS:
332                 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_STATUS,
333                                 BQ2415X_MASK_STAT, BQ2415X_SHIFT_STAT);
334         case BQ2415X_BOOST_STATUS:
335                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS,
336                                 BQ2415X_BIT_BOOST);
337         case BQ2415X_FAULT_STATUS:
338                 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_STATUS,
339                         BQ2415X_MASK_FAULT, BQ2415X_SHIFT_FAULT);
340
341         case BQ2415X_CHARGE_TERMINATION_STATUS:
342                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
343                                 BQ2415X_BIT_TE);
344         case BQ2415X_CHARGE_TERMINATION_ENABLE:
345                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
346                                 1, BQ2415X_BIT_TE);
347         case BQ2415X_CHARGE_TERMINATION_DISABLE:
348                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
349                                 0, BQ2415X_BIT_TE);
350         case BQ2415X_CHARGER_STATUS:
351                 ret = bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
352                         BQ2415X_BIT_CE);
353                 if (ret < 0)
354                         return ret;
355                 return ret > 0 ? 0 : 1;
356         case BQ2415X_CHARGER_ENABLE:
357                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
358                                 0, BQ2415X_BIT_CE);
359         case BQ2415X_CHARGER_DISABLE:
360                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
361                                 1, BQ2415X_BIT_CE);
362         case BQ2415X_HIGH_IMPEDANCE_STATUS:
363                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
364                                 BQ2415X_BIT_HZ_MODE);
365         case BQ2415X_HIGH_IMPEDANCE_ENABLE:
366                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
367                                 1, BQ2415X_BIT_HZ_MODE);
368         case BQ2415X_HIGH_IMPEDANCE_DISABLE:
369                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
370                                 0, BQ2415X_BIT_HZ_MODE);
371         case BQ2415X_BOOST_MODE_STATUS:
372                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
373                                 BQ2415X_BIT_OPA_MODE);
374         case BQ2415X_BOOST_MODE_ENABLE:
375                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
376                                 1, BQ2415X_BIT_OPA_MODE);
377         case BQ2415X_BOOST_MODE_DISABLE:
378                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
379                                 0, BQ2415X_BIT_OPA_MODE);
380
381         case BQ2415X_OTG_LEVEL:
382                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_VOLTAGE,
383                                 BQ2415X_BIT_OTG_PL);
384         case BQ2415X_OTG_ACTIVATE_HIGH:
385                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
386                                 1, BQ2415X_BIT_OTG_PL);
387         case BQ2415X_OTG_ACTIVATE_LOW:
388                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
389                                 0, BQ2415X_BIT_OTG_PL);
390         case BQ2415X_OTG_PIN_STATUS:
391                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_VOLTAGE,
392                                 BQ2415X_BIT_OTG_EN);
393         case BQ2415X_OTG_PIN_ENABLE:
394                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
395                                 1, BQ2415X_BIT_OTG_EN);
396         case BQ2415X_OTG_PIN_DISABLE:
397                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
398                                 0, BQ2415X_BIT_OTG_EN);
399
400         case BQ2415X_VENDER_CODE:
401                 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER,
402                         BQ2415X_MASK_VENDER, BQ2415X_SHIFT_VENDER);
403         case BQ2415X_PART_NUMBER:
404                 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER,
405                                 BQ2415X_MASK_PN, BQ2415X_SHIFT_PN);
406         case BQ2415X_REVISION:
407                 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER,
408                         BQ2415X_MASK_REVISION, BQ2415X_SHIFT_REVISION);
409         }
410         return -EINVAL;
411 }
412
413 /* detect chip type */
414 static enum bq2415x_chip bq2415x_detect_chip(struct bq2415x_device *bq)
415 {
416         struct i2c_client *client = to_i2c_client(bq->dev);
417         int ret = bq2415x_exec_command(bq, BQ2415X_PART_NUMBER);
418
419         if (ret < 0)
420                 return ret;
421
422         switch (client->addr) {
423         case 0x6b:
424                 switch (ret) {
425                 case 0:
426                         if (bq->chip == BQ24151A)
427                                 return bq->chip;
428                         return BQ24151;
429                 case 1:
430                         if (bq->chip == BQ24150A ||
431                                 bq->chip == BQ24152 ||
432                                 bq->chip == BQ24155)
433                                 return bq->chip;
434                         return BQ24150;
435                 case 2:
436                         if (bq->chip == BQ24153A)
437                                 return bq->chip;
438                         return BQ24153;
439                 default:
440                         return BQUNKNOWN;
441                 }
442                 break;
443
444         case 0x6a:
445                 switch (ret) {
446                 case 0:
447                         if (bq->chip == BQ24156A)
448                                 return bq->chip;
449                         return BQ24156;
450                 case 2:
451                         if (bq->chip == BQ24157S)
452                                 return bq->chip;
453                         return BQ24158;
454                 default:
455                         return BQUNKNOWN;
456                 }
457                 break;
458         }
459
460         return BQUNKNOWN;
461 }
462
463 /* detect chip revision */
464 static int bq2415x_detect_revision(struct bq2415x_device *bq)
465 {
466         int ret = bq2415x_exec_command(bq, BQ2415X_REVISION);
467         int chip = bq2415x_detect_chip(bq);
468
469         if (ret < 0 || chip < 0)
470                 return -1;
471
472         switch (chip) {
473         case BQ24150:
474         case BQ24150A:
475         case BQ24151:
476         case BQ24151A:
477         case BQ24152:
478                 if (ret >= 0 && ret <= 3)
479                         return ret;
480                 return -1;
481         case BQ24153:
482         case BQ24153A:
483         case BQ24156:
484         case BQ24156A:
485         case BQ24157S:
486         case BQ24158:
487                 if (ret == 3)
488                         return 0;
489                 else if (ret == 1)
490                         return 1;
491                 return -1;
492         case BQ24155:
493                 if (ret == 3)
494                         return 3;
495                 return -1;
496         case BQUNKNOWN:
497                 return -1;
498         }
499
500         return -1;
501 }
502
503 /* return chip vender code */
504 static int bq2415x_get_vender_code(struct bq2415x_device *bq)
505 {
506         int ret;
507
508         ret = bq2415x_exec_command(bq, BQ2415X_VENDER_CODE);
509         if (ret < 0)
510                 return 0;
511
512         /* convert to binary */
513         return (ret & 0x1) +
514                ((ret >> 1) & 0x1) * 10 +
515                ((ret >> 2) & 0x1) * 100;
516 }
517
518 /* reset all chip registers to default state */
519 static void bq2415x_reset_chip(struct bq2415x_device *bq)
520 {
521         bq2415x_i2c_write(bq, BQ2415X_REG_CURRENT, BQ2415X_RESET_CURRENT);
522         bq2415x_i2c_write(bq, BQ2415X_REG_VOLTAGE, BQ2415X_RESET_VOLTAGE);
523         bq2415x_i2c_write(bq, BQ2415X_REG_CONTROL, BQ2415X_RESET_CONTROL);
524         bq2415x_i2c_write(bq, BQ2415X_REG_STATUS, BQ2415X_RESET_STATUS);
525         bq->timer_error = NULL;
526 }
527
528 /**** properties functions ****/
529
530 /* set current limit in mA */
531 static int bq2415x_set_current_limit(struct bq2415x_device *bq, int mA)
532 {
533         int val;
534
535         if (mA <= 100)
536                 val = 0;
537         else if (mA <= 500)
538                 val = 1;
539         else if (mA <= 800)
540                 val = 2;
541         else
542                 val = 3;
543
544         return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CONTROL, val,
545                         BQ2415X_MASK_LIMIT, BQ2415X_SHIFT_LIMIT);
546 }
547
548 /* get current limit in mA */
549 static int bq2415x_get_current_limit(struct bq2415x_device *bq)
550 {
551         int ret;
552
553         ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CONTROL,
554                         BQ2415X_MASK_LIMIT, BQ2415X_SHIFT_LIMIT);
555         if (ret < 0)
556                 return ret;
557         else if (ret == 0)
558                 return 100;
559         else if (ret == 1)
560                 return 500;
561         else if (ret == 2)
562                 return 800;
563         else if (ret == 3)
564                 return 1800;
565         return -EINVAL;
566 }
567
568 /* set weak battery voltage in mV */
569 static int bq2415x_set_weak_battery_voltage(struct bq2415x_device *bq, int mV)
570 {
571         int val;
572
573         /* round to 100mV */
574         if (mV <= 3400 + 50)
575                 val = 0;
576         else if (mV <= 3500 + 50)
577                 val = 1;
578         else if (mV <= 3600 + 50)
579                 val = 2;
580         else
581                 val = 3;
582
583         return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CONTROL, val,
584                         BQ2415X_MASK_VLOWV, BQ2415X_SHIFT_VLOWV);
585 }
586
587 /* get weak battery voltage in mV */
588 static int bq2415x_get_weak_battery_voltage(struct bq2415x_device *bq)
589 {
590         int ret;
591
592         ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CONTROL,
593                         BQ2415X_MASK_VLOWV, BQ2415X_SHIFT_VLOWV);
594         if (ret < 0)
595                 return ret;
596         return 100 * (34 + ret);
597 }
598
599 /* set battery regulation voltage in mV */
600 static int bq2415x_set_battery_regulation_voltage(struct bq2415x_device *bq,
601                                                   int mV)
602 {
603         int val = (mV/10 - 350) / 2;
604
605         /*
606          * According to datasheet, maximum battery regulation voltage is
607          * 4440mV which is b101111 = 47.
608          */
609         if (val < 0)
610                 val = 0;
611         else if (val > 47)
612                 return -EINVAL;
613
614         return bq2415x_i2c_write_mask(bq, BQ2415X_REG_VOLTAGE, val,
615                         BQ2415X_MASK_VO, BQ2415X_SHIFT_VO);
616 }
617
618 /* get battery regulation voltage in mV */
619 static int bq2415x_get_battery_regulation_voltage(struct bq2415x_device *bq)
620 {
621         int ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_VOLTAGE,
622                         BQ2415X_MASK_VO, BQ2415X_SHIFT_VO);
623
624         if (ret < 0)
625                 return ret;
626         return 10 * (350 + 2*ret);
627 }
628
629 /* set charge current in mA (platform data must provide resistor sense) */
630 static int bq2415x_set_charge_current(struct bq2415x_device *bq, int mA)
631 {
632         int val;
633
634         if (bq->init_data.resistor_sense <= 0)
635                 return -EINVAL;
636
637         val = (mA * bq->init_data.resistor_sense - 37400) / 6800;
638         if (val < 0)
639                 val = 0;
640         else if (val > 7)
641                 val = 7;
642
643         return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CURRENT, val,
644                         BQ2415X_MASK_VI_CHRG | BQ2415X_MASK_RESET,
645                         BQ2415X_SHIFT_VI_CHRG);
646 }
647
648 /* get charge current in mA (platform data must provide resistor sense) */
649 static int bq2415x_get_charge_current(struct bq2415x_device *bq)
650 {
651         int ret;
652
653         if (bq->init_data.resistor_sense <= 0)
654                 return -EINVAL;
655
656         ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CURRENT,
657                         BQ2415X_MASK_VI_CHRG, BQ2415X_SHIFT_VI_CHRG);
658         if (ret < 0)
659                 return ret;
660         return (37400 + 6800*ret) / bq->init_data.resistor_sense;
661 }
662
663 /* set termination current in mA (platform data must provide resistor sense) */
664 static int bq2415x_set_termination_current(struct bq2415x_device *bq, int mA)
665 {
666         int val;
667
668         if (bq->init_data.resistor_sense <= 0)
669                 return -EINVAL;
670
671         val = (mA * bq->init_data.resistor_sense - 3400) / 3400;
672         if (val < 0)
673                 val = 0;
674         else if (val > 7)
675                 val = 7;
676
677         return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CURRENT, val,
678                         BQ2415X_MASK_VI_TERM | BQ2415X_MASK_RESET,
679                         BQ2415X_SHIFT_VI_TERM);
680 }
681
682 /* get termination current in mA (platform data must provide resistor sense) */
683 static int bq2415x_get_termination_current(struct bq2415x_device *bq)
684 {
685         int ret;
686
687         if (bq->init_data.resistor_sense <= 0)
688                 return -EINVAL;
689
690         ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CURRENT,
691                         BQ2415X_MASK_VI_TERM, BQ2415X_SHIFT_VI_TERM);
692         if (ret < 0)
693                 return ret;
694         return (3400 + 3400*ret) / bq->init_data.resistor_sense;
695 }
696
697 /* set default value of property */
698 #define bq2415x_set_default_value(bq, prop) \
699         do { \
700                 int ret = 0; \
701                 if (bq->init_data.prop != -1) \
702                         ret = bq2415x_set_##prop(bq, bq->init_data.prop); \
703                 if (ret < 0) \
704                         return ret; \
705         } while (0)
706
707 /* set default values of all properties */
708 static int bq2415x_set_defaults(struct bq2415x_device *bq)
709 {
710         bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_DISABLE);
711         bq2415x_exec_command(bq, BQ2415X_CHARGER_DISABLE);
712         bq2415x_exec_command(bq, BQ2415X_CHARGE_TERMINATION_DISABLE);
713
714         bq2415x_set_default_value(bq, current_limit);
715         bq2415x_set_default_value(bq, weak_battery_voltage);
716         bq2415x_set_default_value(bq, battery_regulation_voltage);
717
718         if (bq->init_data.resistor_sense > 0) {
719                 bq2415x_set_default_value(bq, charge_current);
720                 bq2415x_set_default_value(bq, termination_current);
721                 bq2415x_exec_command(bq, BQ2415X_CHARGE_TERMINATION_ENABLE);
722         }
723
724         bq2415x_exec_command(bq, BQ2415X_CHARGER_ENABLE);
725         return 0;
726 }
727
728 /**** charger mode functions ****/
729
730 /* set charger mode */
731 static int bq2415x_set_mode(struct bq2415x_device *bq, enum bq2415x_mode mode)
732 {
733         int ret = 0;
734         int charger = 0;
735         int boost = 0;
736
737         if (mode == BQ2415X_MODE_BOOST)
738                 boost = 1;
739         else if (mode != BQ2415X_MODE_OFF)
740                 charger = 1;
741
742         if (!charger)
743                 ret = bq2415x_exec_command(bq, BQ2415X_CHARGER_DISABLE);
744
745         if (!boost)
746                 ret = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_DISABLE);
747
748         if (ret < 0)
749                 return ret;
750
751         switch (mode) {
752         case BQ2415X_MODE_OFF:
753                 dev_dbg(bq->dev, "changing mode to: Offline\n");
754                 ret = bq2415x_set_current_limit(bq, 100);
755                 break;
756         case BQ2415X_MODE_NONE:
757                 dev_dbg(bq->dev, "changing mode to: N/A\n");
758                 ret = bq2415x_set_current_limit(bq, 100);
759                 break;
760         case BQ2415X_MODE_HOST_CHARGER:
761                 dev_dbg(bq->dev, "changing mode to: Host/HUB charger\n");
762                 ret = bq2415x_set_current_limit(bq, 500);
763                 break;
764         case BQ2415X_MODE_DEDICATED_CHARGER:
765                 dev_dbg(bq->dev, "changing mode to: Dedicated charger\n");
766                 ret = bq2415x_set_current_limit(bq, 1800);
767                 break;
768         case BQ2415X_MODE_BOOST: /* Boost mode */
769                 dev_dbg(bq->dev, "changing mode to: Boost\n");
770                 ret = bq2415x_set_current_limit(bq, 100);
771                 break;
772         }
773
774         if (ret < 0)
775                 return ret;
776
777         if (charger)
778                 ret = bq2415x_exec_command(bq, BQ2415X_CHARGER_ENABLE);
779         else if (boost)
780                 ret = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_ENABLE);
781
782         if (ret < 0)
783                 return ret;
784
785         bq2415x_set_default_value(bq, weak_battery_voltage);
786         bq2415x_set_default_value(bq, battery_regulation_voltage);
787
788         bq->mode = mode;
789         sysfs_notify(&bq->charger->dev.kobj, NULL, "mode");
790
791         return 0;
792
793 }
794
795 static bool bq2415x_update_reported_mode(struct bq2415x_device *bq, int mA)
796 {
797         enum bq2415x_mode mode;
798
799         if (mA == 0)
800                 mode = BQ2415X_MODE_OFF;
801         else if (mA < 500)
802                 mode = BQ2415X_MODE_NONE;
803         else if (mA < 1800)
804                 mode = BQ2415X_MODE_HOST_CHARGER;
805         else
806                 mode = BQ2415X_MODE_DEDICATED_CHARGER;
807
808         if (bq->reported_mode == mode)
809                 return false;
810
811         bq->reported_mode = mode;
812         return true;
813 }
814
815 static int bq2415x_notifier_call(struct notifier_block *nb,
816                 unsigned long val, void *v)
817 {
818         struct bq2415x_device *bq =
819                 container_of(nb, struct bq2415x_device, nb);
820         struct power_supply *psy = v;
821         union power_supply_propval prop;
822         int ret;
823
824         if (val != PSY_EVENT_PROP_CHANGED)
825                 return NOTIFY_OK;
826
827         /* Ignore event if it was not send by notify_node/notify_device */
828         if (bq->notify_node) {
829                 if (!psy->dev.parent ||
830                     psy->dev.parent->of_node != bq->notify_node)
831                         return NOTIFY_OK;
832         } else if (bq->init_data.notify_device) {
833                 if (strcmp(psy->desc->name, bq->init_data.notify_device) != 0)
834                         return NOTIFY_OK;
835         }
836
837         dev_dbg(bq->dev, "notifier call was called\n");
838
839         ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_CURRENT_MAX,
840                         &prop);
841         if (ret != 0)
842                 return NOTIFY_OK;
843
844         if (!bq2415x_update_reported_mode(bq, prop.intval))
845                 return NOTIFY_OK;
846
847         /* if automode is not enabled do not tell about reported_mode */
848         if (bq->automode < 1)
849                 return NOTIFY_OK;
850
851         schedule_delayed_work(&bq->work, 0);
852
853         return NOTIFY_OK;
854 }
855
856 /**** timer functions ****/
857
858 /* enable/disable auto resetting chip timer */
859 static void bq2415x_set_autotimer(struct bq2415x_device *bq, int state)
860 {
861         mutex_lock(&bq2415x_timer_mutex);
862
863         if (bq->autotimer == state) {
864                 mutex_unlock(&bq2415x_timer_mutex);
865                 return;
866         }
867
868         bq->autotimer = state;
869
870         if (state) {
871                 schedule_delayed_work(&bq->work, BQ2415X_TIMER_TIMEOUT * HZ);
872                 bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
873                 bq->timer_error = NULL;
874         } else {
875                 cancel_delayed_work_sync(&bq->work);
876         }
877
878         mutex_unlock(&bq2415x_timer_mutex);
879 }
880
881 /* called by bq2415x_timer_work on timer error */
882 static void bq2415x_timer_error(struct bq2415x_device *bq, const char *msg)
883 {
884         bq->timer_error = msg;
885         sysfs_notify(&bq->charger->dev.kobj, NULL, "timer");
886         dev_err(bq->dev, "%s\n", msg);
887         if (bq->automode > 0)
888                 bq->automode = 0;
889         bq2415x_set_mode(bq, BQ2415X_MODE_OFF);
890         bq2415x_set_autotimer(bq, 0);
891 }
892
893 /* delayed work function for auto resetting chip timer */
894 static void bq2415x_timer_work(struct work_struct *work)
895 {
896         struct bq2415x_device *bq = container_of(work, struct bq2415x_device,
897                                                  work.work);
898         int ret;
899         int error;
900         int boost;
901
902         if (bq->automode > 0 && (bq->reported_mode != bq->mode)) {
903                 sysfs_notify(&bq->charger->dev.kobj, NULL, "reported_mode");
904                 bq2415x_set_mode(bq, bq->reported_mode);
905         }
906
907         if (!bq->autotimer)
908                 return;
909
910         ret = bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
911         if (ret < 0) {
912                 bq2415x_timer_error(bq, "Resetting timer failed");
913                 return;
914         }
915
916         boost = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_STATUS);
917         if (boost < 0) {
918                 bq2415x_timer_error(bq, "Unknown error");
919                 return;
920         }
921
922         error = bq2415x_exec_command(bq, BQ2415X_FAULT_STATUS);
923         if (error < 0) {
924                 bq2415x_timer_error(bq, "Unknown error");
925                 return;
926         }
927
928         if (boost) {
929                 switch (error) {
930                 /* Non fatal errors, chip is OK */
931                 case 0: /* No error */
932                         break;
933                 case 6: /* Timer expired */
934                         dev_err(bq->dev, "Timer expired\n");
935                         break;
936                 case 3: /* Battery voltage too low */
937                         dev_err(bq->dev, "Battery voltage to low\n");
938                         break;
939
940                 /* Fatal errors, disable and reset chip */
941                 case 1: /* Overvoltage protection (chip fried) */
942                         bq2415x_timer_error(bq,
943                                 "Overvoltage protection (chip fried)");
944                         return;
945                 case 2: /* Overload */
946                         bq2415x_timer_error(bq, "Overload");
947                         return;
948                 case 4: /* Battery overvoltage protection */
949                         bq2415x_timer_error(bq,
950                                 "Battery overvoltage protection");
951                         return;
952                 case 5: /* Thermal shutdown (too hot) */
953                         bq2415x_timer_error(bq,
954                                         "Thermal shutdown (too hot)");
955                         return;
956                 case 7: /* N/A */
957                         bq2415x_timer_error(bq, "Unknown error");
958                         return;
959                 }
960         } else {
961                 switch (error) {
962                 /* Non fatal errors, chip is OK */
963                 case 0: /* No error */
964                         break;
965                 case 2: /* Sleep mode */
966                         dev_err(bq->dev, "Sleep mode\n");
967                         break;
968                 case 3: /* Poor input source */
969                         dev_err(bq->dev, "Poor input source\n");
970                         break;
971                 case 6: /* Timer expired */
972                         dev_err(bq->dev, "Timer expired\n");
973                         break;
974                 case 7: /* No battery */
975                         dev_err(bq->dev, "No battery\n");
976                         break;
977
978                 /* Fatal errors, disable and reset chip */
979                 case 1: /* Overvoltage protection (chip fried) */
980                         bq2415x_timer_error(bq,
981                                 "Overvoltage protection (chip fried)");
982                         return;
983                 case 4: /* Battery overvoltage protection */
984                         bq2415x_timer_error(bq,
985                                 "Battery overvoltage protection");
986                         return;
987                 case 5: /* Thermal shutdown (too hot) */
988                         bq2415x_timer_error(bq,
989                                 "Thermal shutdown (too hot)");
990                         return;
991                 }
992         }
993
994         schedule_delayed_work(&bq->work, BQ2415X_TIMER_TIMEOUT * HZ);
995 }
996
997 /**** power supply interface code ****/
998
999 static enum power_supply_property bq2415x_power_supply_props[] = {
1000         /* TODO: maybe add more power supply properties */
1001         POWER_SUPPLY_PROP_STATUS,
1002         POWER_SUPPLY_PROP_MODEL_NAME,
1003 };
1004
1005 static int bq2415x_power_supply_get_property(struct power_supply *psy,
1006                                              enum power_supply_property psp,
1007                                              union power_supply_propval *val)
1008 {
1009         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1010         int ret;
1011
1012         switch (psp) {
1013         case POWER_SUPPLY_PROP_STATUS:
1014                 ret = bq2415x_exec_command(bq, BQ2415X_CHARGE_STATUS);
1015                 if (ret < 0)
1016                         return ret;
1017                 else if (ret == 0) /* Ready */
1018                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
1019                 else if (ret == 1) /* Charge in progress */
1020                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
1021                 else if (ret == 2) /* Charge done */
1022                         val->intval = POWER_SUPPLY_STATUS_FULL;
1023                 else
1024                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
1025                 break;
1026         case POWER_SUPPLY_PROP_MODEL_NAME:
1027                 val->strval = bq->model;
1028                 break;
1029         default:
1030                 return -EINVAL;
1031         }
1032         return 0;
1033 }
1034
1035 static int bq2415x_power_supply_init(struct bq2415x_device *bq)
1036 {
1037         int ret;
1038         int chip;
1039         char revstr[8];
1040         struct power_supply_config psy_cfg = { .drv_data = bq, };
1041
1042         bq->charger_desc.name = bq->name;
1043         bq->charger_desc.type = POWER_SUPPLY_TYPE_USB;
1044         bq->charger_desc.properties = bq2415x_power_supply_props;
1045         bq->charger_desc.num_properties =
1046                         ARRAY_SIZE(bq2415x_power_supply_props);
1047         bq->charger_desc.get_property = bq2415x_power_supply_get_property;
1048
1049         ret = bq2415x_detect_chip(bq);
1050         if (ret < 0)
1051                 chip = BQUNKNOWN;
1052         else
1053                 chip = ret;
1054
1055         ret = bq2415x_detect_revision(bq);
1056         if (ret < 0)
1057                 strcpy(revstr, "unknown");
1058         else
1059                 sprintf(revstr, "1.%d", ret);
1060
1061         bq->model = kasprintf(GFP_KERNEL,
1062                                 "chip %s, revision %s, vender code %.3d",
1063                                 bq2415x_chip_name[chip], revstr,
1064                                 bq2415x_get_vender_code(bq));
1065         if (!bq->model) {
1066                 dev_err(bq->dev, "failed to allocate model name\n");
1067                 return -ENOMEM;
1068         }
1069
1070         bq->charger = power_supply_register(bq->dev, &bq->charger_desc,
1071                                             &psy_cfg);
1072         if (IS_ERR(bq->charger)) {
1073                 kfree(bq->model);
1074                 return PTR_ERR(bq->charger);
1075         }
1076
1077         return 0;
1078 }
1079
1080 static void bq2415x_power_supply_exit(struct bq2415x_device *bq)
1081 {
1082         bq->autotimer = 0;
1083         if (bq->automode > 0)
1084                 bq->automode = 0;
1085         cancel_delayed_work_sync(&bq->work);
1086         power_supply_unregister(bq->charger);
1087         kfree(bq->model);
1088 }
1089
1090 /**** additional sysfs entries for power supply interface ****/
1091
1092 /* show *_status entries */
1093 static ssize_t bq2415x_sysfs_show_status(struct device *dev,
1094                                          struct device_attribute *attr,
1095                                          char *buf)
1096 {
1097         struct power_supply *psy = dev_get_drvdata(dev);
1098         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1099         enum bq2415x_command command;
1100         int ret;
1101
1102         if (strcmp(attr->attr.name, "otg_status") == 0)
1103                 command = BQ2415X_OTG_STATUS;
1104         else if (strcmp(attr->attr.name, "charge_status") == 0)
1105                 command = BQ2415X_CHARGE_STATUS;
1106         else if (strcmp(attr->attr.name, "boost_status") == 0)
1107                 command = BQ2415X_BOOST_STATUS;
1108         else if (strcmp(attr->attr.name, "fault_status") == 0)
1109                 command = BQ2415X_FAULT_STATUS;
1110         else
1111                 return -EINVAL;
1112
1113         ret = bq2415x_exec_command(bq, command);
1114         if (ret < 0)
1115                 return ret;
1116         return sprintf(buf, "%d\n", ret);
1117 }
1118
1119 /*
1120  * set timer entry:
1121  *    auto - enable auto mode
1122  *    off - disable auto mode
1123  *    (other values) - reset chip timer
1124  */
1125 static ssize_t bq2415x_sysfs_set_timer(struct device *dev,
1126                                        struct device_attribute *attr,
1127                                        const char *buf,
1128                                        size_t count)
1129 {
1130         struct power_supply *psy = dev_get_drvdata(dev);
1131         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1132         int ret = 0;
1133
1134         if (strncmp(buf, "auto", 4) == 0)
1135                 bq2415x_set_autotimer(bq, 1);
1136         else if (strncmp(buf, "off", 3) == 0)
1137                 bq2415x_set_autotimer(bq, 0);
1138         else
1139                 ret = bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
1140
1141         if (ret < 0)
1142                 return ret;
1143         return count;
1144 }
1145
1146 /* show timer entry (auto or off) */
1147 static ssize_t bq2415x_sysfs_show_timer(struct device *dev,
1148                                         struct device_attribute *attr,
1149                                         char *buf)
1150 {
1151         struct power_supply *psy = dev_get_drvdata(dev);
1152         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1153
1154         if (bq->timer_error)
1155                 return sprintf(buf, "%s\n", bq->timer_error);
1156
1157         if (bq->autotimer)
1158                 return sprintf(buf, "auto\n");
1159         return sprintf(buf, "off\n");
1160 }
1161
1162 /*
1163  * set mode entry:
1164  *    auto - if automode is supported, enable it and set mode to reported
1165  *    none - disable charger and boost mode
1166  *    host - charging mode for host/hub chargers (current limit 500mA)
1167  *    dedicated - charging mode for dedicated chargers (unlimited current limit)
1168  *    boost - disable charger and enable boost mode
1169  */
1170 static ssize_t bq2415x_sysfs_set_mode(struct device *dev,
1171                                       struct device_attribute *attr,
1172                                       const char *buf,
1173                                       size_t count)
1174 {
1175         struct power_supply *psy = dev_get_drvdata(dev);
1176         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1177         enum bq2415x_mode mode;
1178         int ret = 0;
1179
1180         if (strncmp(buf, "auto", 4) == 0) {
1181                 if (bq->automode < 0)
1182                         return -EINVAL;
1183                 bq->automode = 1;
1184                 mode = bq->reported_mode;
1185         } else if (strncmp(buf, "off", 3) == 0) {
1186                 if (bq->automode > 0)
1187                         bq->automode = 0;
1188                 mode = BQ2415X_MODE_OFF;
1189         } else if (strncmp(buf, "none", 4) == 0) {
1190                 if (bq->automode > 0)
1191                         bq->automode = 0;
1192                 mode = BQ2415X_MODE_NONE;
1193         } else if (strncmp(buf, "host", 4) == 0) {
1194                 if (bq->automode > 0)
1195                         bq->automode = 0;
1196                 mode = BQ2415X_MODE_HOST_CHARGER;
1197         } else if (strncmp(buf, "dedicated", 9) == 0) {
1198                 if (bq->automode > 0)
1199                         bq->automode = 0;
1200                 mode = BQ2415X_MODE_DEDICATED_CHARGER;
1201         } else if (strncmp(buf, "boost", 5) == 0) {
1202                 if (bq->automode > 0)
1203                         bq->automode = 0;
1204                 mode = BQ2415X_MODE_BOOST;
1205         } else if (strncmp(buf, "reset", 5) == 0) {
1206                 bq2415x_reset_chip(bq);
1207                 bq2415x_set_defaults(bq);
1208                 if (bq->automode <= 0)
1209                         return count;
1210                 bq->automode = 1;
1211                 mode = bq->reported_mode;
1212         } else {
1213                 return -EINVAL;
1214         }
1215
1216         ret = bq2415x_set_mode(bq, mode);
1217         if (ret < 0)
1218                 return ret;
1219         return count;
1220 }
1221
1222 /* show mode entry (auto, none, host, dedicated or boost) */
1223 static ssize_t bq2415x_sysfs_show_mode(struct device *dev,
1224                                        struct device_attribute *attr,
1225                                        char *buf)
1226 {
1227         struct power_supply *psy = dev_get_drvdata(dev);
1228         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1229         ssize_t ret = 0;
1230
1231         if (bq->automode > 0)
1232                 ret += sprintf(buf+ret, "auto (");
1233
1234         switch (bq->mode) {
1235         case BQ2415X_MODE_OFF:
1236                 ret += sprintf(buf+ret, "off");
1237                 break;
1238         case BQ2415X_MODE_NONE:
1239                 ret += sprintf(buf+ret, "none");
1240                 break;
1241         case BQ2415X_MODE_HOST_CHARGER:
1242                 ret += sprintf(buf+ret, "host");
1243                 break;
1244         case BQ2415X_MODE_DEDICATED_CHARGER:
1245                 ret += sprintf(buf+ret, "dedicated");
1246                 break;
1247         case BQ2415X_MODE_BOOST:
1248                 ret += sprintf(buf+ret, "boost");
1249                 break;
1250         }
1251
1252         if (bq->automode > 0)
1253                 ret += sprintf(buf+ret, ")");
1254
1255         ret += sprintf(buf+ret, "\n");
1256         return ret;
1257 }
1258
1259 /* show reported_mode entry (none, host, dedicated or boost) */
1260 static ssize_t bq2415x_sysfs_show_reported_mode(struct device *dev,
1261                                                 struct device_attribute *attr,
1262                                                 char *buf)
1263 {
1264         struct power_supply *psy = dev_get_drvdata(dev);
1265         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1266
1267         if (bq->automode < 0)
1268                 return -EINVAL;
1269
1270         switch (bq->reported_mode) {
1271         case BQ2415X_MODE_OFF:
1272                 return sprintf(buf, "off\n");
1273         case BQ2415X_MODE_NONE:
1274                 return sprintf(buf, "none\n");
1275         case BQ2415X_MODE_HOST_CHARGER:
1276                 return sprintf(buf, "host\n");
1277         case BQ2415X_MODE_DEDICATED_CHARGER:
1278                 return sprintf(buf, "dedicated\n");
1279         case BQ2415X_MODE_BOOST:
1280                 return sprintf(buf, "boost\n");
1281         }
1282
1283         return -EINVAL;
1284 }
1285
1286 /* directly set raw value to chip register, format: 'register value' */
1287 static ssize_t bq2415x_sysfs_set_registers(struct device *dev,
1288                                            struct device_attribute *attr,
1289                                            const char *buf,
1290                                            size_t count)
1291 {
1292         struct power_supply *psy = dev_get_drvdata(dev);
1293         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1294         ssize_t ret = 0;
1295         unsigned int reg;
1296         unsigned int val;
1297
1298         if (sscanf(buf, "%x %x", &reg, &val) != 2)
1299                 return -EINVAL;
1300
1301         if (reg > 4 || val > 255)
1302                 return -EINVAL;
1303
1304         ret = bq2415x_i2c_write(bq, reg, val);
1305         if (ret < 0)
1306                 return ret;
1307         return count;
1308 }
1309
1310 /* print value of chip register, format: 'register=value' */
1311 static ssize_t bq2415x_sysfs_print_reg(struct bq2415x_device *bq,
1312                                        u8 reg,
1313                                        char *buf)
1314 {
1315         int ret = bq2415x_i2c_read(bq, reg);
1316
1317         if (ret < 0)
1318                 return sprintf(buf, "%#.2x=error %d\n", reg, ret);
1319         return sprintf(buf, "%#.2x=%#.2x\n", reg, ret);
1320 }
1321
1322 /* show all raw values of chip register, format per line: 'register=value' */
1323 static ssize_t bq2415x_sysfs_show_registers(struct device *dev,
1324                                             struct device_attribute *attr,
1325                                             char *buf)
1326 {
1327         struct power_supply *psy = dev_get_drvdata(dev);
1328         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1329         ssize_t ret = 0;
1330
1331         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_STATUS, buf+ret);
1332         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CONTROL, buf+ret);
1333         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VOLTAGE, buf+ret);
1334         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VENDER, buf+ret);
1335         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CURRENT, buf+ret);
1336         return ret;
1337 }
1338
1339 /* set current and voltage limit entries (in mA or mV) */
1340 static ssize_t bq2415x_sysfs_set_limit(struct device *dev,
1341                                        struct device_attribute *attr,
1342                                        const char *buf,
1343                                        size_t count)
1344 {
1345         struct power_supply *psy = dev_get_drvdata(dev);
1346         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1347         long val;
1348         int ret;
1349
1350         if (kstrtol(buf, 10, &val) < 0)
1351                 return -EINVAL;
1352
1353         if (strcmp(attr->attr.name, "current_limit") == 0)
1354                 ret = bq2415x_set_current_limit(bq, val);
1355         else if (strcmp(attr->attr.name, "weak_battery_voltage") == 0)
1356                 ret = bq2415x_set_weak_battery_voltage(bq, val);
1357         else if (strcmp(attr->attr.name, "battery_regulation_voltage") == 0)
1358                 ret = bq2415x_set_battery_regulation_voltage(bq, val);
1359         else if (strcmp(attr->attr.name, "charge_current") == 0)
1360                 ret = bq2415x_set_charge_current(bq, val);
1361         else if (strcmp(attr->attr.name, "termination_current") == 0)
1362                 ret = bq2415x_set_termination_current(bq, val);
1363         else
1364                 return -EINVAL;
1365
1366         if (ret < 0)
1367                 return ret;
1368         return count;
1369 }
1370
1371 /* show current and voltage limit entries (in mA or mV) */
1372 static ssize_t bq2415x_sysfs_show_limit(struct device *dev,
1373                                         struct device_attribute *attr,
1374                                         char *buf)
1375 {
1376         struct power_supply *psy = dev_get_drvdata(dev);
1377         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1378         int ret;
1379
1380         if (strcmp(attr->attr.name, "current_limit") == 0)
1381                 ret = bq2415x_get_current_limit(bq);
1382         else if (strcmp(attr->attr.name, "weak_battery_voltage") == 0)
1383                 ret = bq2415x_get_weak_battery_voltage(bq);
1384         else if (strcmp(attr->attr.name, "battery_regulation_voltage") == 0)
1385                 ret = bq2415x_get_battery_regulation_voltage(bq);
1386         else if (strcmp(attr->attr.name, "charge_current") == 0)
1387                 ret = bq2415x_get_charge_current(bq);
1388         else if (strcmp(attr->attr.name, "termination_current") == 0)
1389                 ret = bq2415x_get_termination_current(bq);
1390         else
1391                 return -EINVAL;
1392
1393         if (ret < 0)
1394                 return ret;
1395         return sprintf(buf, "%d\n", ret);
1396 }
1397
1398 /* set *_enable entries */
1399 static ssize_t bq2415x_sysfs_set_enable(struct device *dev,
1400                                         struct device_attribute *attr,
1401                                         const char *buf,
1402                                         size_t count)
1403 {
1404         struct power_supply *psy = dev_get_drvdata(dev);
1405         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1406         enum bq2415x_command command;
1407         long val;
1408         int ret;
1409
1410         if (kstrtol(buf, 10, &val) < 0)
1411                 return -EINVAL;
1412
1413         if (strcmp(attr->attr.name, "charge_termination_enable") == 0)
1414                 command = val ? BQ2415X_CHARGE_TERMINATION_ENABLE :
1415                         BQ2415X_CHARGE_TERMINATION_DISABLE;
1416         else if (strcmp(attr->attr.name, "high_impedance_enable") == 0)
1417                 command = val ? BQ2415X_HIGH_IMPEDANCE_ENABLE :
1418                         BQ2415X_HIGH_IMPEDANCE_DISABLE;
1419         else if (strcmp(attr->attr.name, "otg_pin_enable") == 0)
1420                 command = val ? BQ2415X_OTG_PIN_ENABLE :
1421                         BQ2415X_OTG_PIN_DISABLE;
1422         else if (strcmp(attr->attr.name, "stat_pin_enable") == 0)
1423                 command = val ? BQ2415X_STAT_PIN_ENABLE :
1424                         BQ2415X_STAT_PIN_DISABLE;
1425         else
1426                 return -EINVAL;
1427
1428         ret = bq2415x_exec_command(bq, command);
1429         if (ret < 0)
1430                 return ret;
1431         return count;
1432 }
1433
1434 /* show *_enable entries */
1435 static ssize_t bq2415x_sysfs_show_enable(struct device *dev,
1436                                          struct device_attribute *attr,
1437                                          char *buf)
1438 {
1439         struct power_supply *psy = dev_get_drvdata(dev);
1440         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1441         enum bq2415x_command command;
1442         int ret;
1443
1444         if (strcmp(attr->attr.name, "charge_termination_enable") == 0)
1445                 command = BQ2415X_CHARGE_TERMINATION_STATUS;
1446         else if (strcmp(attr->attr.name, "high_impedance_enable") == 0)
1447                 command = BQ2415X_HIGH_IMPEDANCE_STATUS;
1448         else if (strcmp(attr->attr.name, "otg_pin_enable") == 0)
1449                 command = BQ2415X_OTG_PIN_STATUS;
1450         else if (strcmp(attr->attr.name, "stat_pin_enable") == 0)
1451                 command = BQ2415X_STAT_PIN_STATUS;
1452         else
1453                 return -EINVAL;
1454
1455         ret = bq2415x_exec_command(bq, command);
1456         if (ret < 0)
1457                 return ret;
1458         return sprintf(buf, "%d\n", ret);
1459 }
1460
1461 static DEVICE_ATTR(current_limit, S_IWUSR | S_IRUGO,
1462                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1463 static DEVICE_ATTR(weak_battery_voltage, S_IWUSR | S_IRUGO,
1464                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1465 static DEVICE_ATTR(battery_regulation_voltage, S_IWUSR | S_IRUGO,
1466                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1467 static DEVICE_ATTR(charge_current, S_IWUSR | S_IRUGO,
1468                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1469 static DEVICE_ATTR(termination_current, S_IWUSR | S_IRUGO,
1470                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1471
1472 static DEVICE_ATTR(charge_termination_enable, S_IWUSR | S_IRUGO,
1473                 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1474 static DEVICE_ATTR(high_impedance_enable, S_IWUSR | S_IRUGO,
1475                 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1476 static DEVICE_ATTR(otg_pin_enable, S_IWUSR | S_IRUGO,
1477                 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1478 static DEVICE_ATTR(stat_pin_enable, S_IWUSR | S_IRUGO,
1479                 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1480
1481 static DEVICE_ATTR(reported_mode, S_IRUGO,
1482                 bq2415x_sysfs_show_reported_mode, NULL);
1483 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO,
1484                 bq2415x_sysfs_show_mode, bq2415x_sysfs_set_mode);
1485 static DEVICE_ATTR(timer, S_IWUSR | S_IRUGO,
1486                 bq2415x_sysfs_show_timer, bq2415x_sysfs_set_timer);
1487
1488 static DEVICE_ATTR(registers, S_IWUSR | S_IRUGO,
1489                 bq2415x_sysfs_show_registers, bq2415x_sysfs_set_registers);
1490
1491 static DEVICE_ATTR(otg_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1492 static DEVICE_ATTR(charge_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1493 static DEVICE_ATTR(boost_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1494 static DEVICE_ATTR(fault_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1495
1496 static struct attribute *bq2415x_sysfs_attributes[] = {
1497         /*
1498          * TODO: some (appropriate) of these attrs should be switched to
1499          * use power supply class props.
1500          */
1501         &dev_attr_current_limit.attr,
1502         &dev_attr_weak_battery_voltage.attr,
1503         &dev_attr_battery_regulation_voltage.attr,
1504         &dev_attr_charge_current.attr,
1505         &dev_attr_termination_current.attr,
1506
1507         &dev_attr_charge_termination_enable.attr,
1508         &dev_attr_high_impedance_enable.attr,
1509         &dev_attr_otg_pin_enable.attr,
1510         &dev_attr_stat_pin_enable.attr,
1511
1512         &dev_attr_reported_mode.attr,
1513         &dev_attr_mode.attr,
1514         &dev_attr_timer.attr,
1515
1516         &dev_attr_registers.attr,
1517
1518         &dev_attr_otg_status.attr,
1519         &dev_attr_charge_status.attr,
1520         &dev_attr_boost_status.attr,
1521         &dev_attr_fault_status.attr,
1522         NULL,
1523 };
1524
1525 static const struct attribute_group bq2415x_sysfs_attr_group = {
1526         .attrs = bq2415x_sysfs_attributes,
1527 };
1528
1529 static int bq2415x_sysfs_init(struct bq2415x_device *bq)
1530 {
1531         return sysfs_create_group(&bq->charger->dev.kobj,
1532                         &bq2415x_sysfs_attr_group);
1533 }
1534
1535 static void bq2415x_sysfs_exit(struct bq2415x_device *bq)
1536 {
1537         sysfs_remove_group(&bq->charger->dev.kobj, &bq2415x_sysfs_attr_group);
1538 }
1539
1540 /* main bq2415x probe function */
1541 static int bq2415x_probe(struct i2c_client *client,
1542                          const struct i2c_device_id *id)
1543 {
1544         int ret;
1545         int num;
1546         char *name = NULL;
1547         struct bq2415x_device *bq;
1548         struct device_node *np = client->dev.of_node;
1549         struct bq2415x_platform_data *pdata = client->dev.platform_data;
1550         const struct acpi_device_id *acpi_id = NULL;
1551         struct power_supply *notify_psy = NULL;
1552         union power_supply_propval prop;
1553
1554         if (!np && !pdata && !ACPI_HANDLE(&client->dev)) {
1555                 dev_err(&client->dev, "Neither devicetree, nor platform data, nor ACPI support\n");
1556                 return -ENODEV;
1557         }
1558
1559         /* Get new ID for the new device */
1560         mutex_lock(&bq2415x_id_mutex);
1561         num = idr_alloc(&bq2415x_id, client, 0, 0, GFP_KERNEL);
1562         mutex_unlock(&bq2415x_id_mutex);
1563         if (num < 0)
1564                 return num;
1565
1566         if (id) {
1567                 name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
1568         } else if (ACPI_HANDLE(&client->dev)) {
1569                 acpi_id =
1570                         acpi_match_device(client->dev.driver->acpi_match_table,
1571                                           &client->dev);
1572                 name = kasprintf(GFP_KERNEL, "%s-%d", acpi_id->id, num);
1573         }
1574         if (!name) {
1575                 dev_err(&client->dev, "failed to allocate device name\n");
1576                 ret = -ENOMEM;
1577                 goto error_1;
1578         }
1579
1580         bq = devm_kzalloc(&client->dev, sizeof(*bq), GFP_KERNEL);
1581         if (!bq) {
1582                 ret = -ENOMEM;
1583                 goto error_2;
1584         }
1585
1586         i2c_set_clientdata(client, bq);
1587
1588         bq->id = num;
1589         bq->dev = &client->dev;
1590         if (id)
1591                 bq->chip = id->driver_data;
1592         else if (ACPI_HANDLE(bq->dev))
1593                 bq->chip = acpi_id->driver_data;
1594         bq->name = name;
1595         bq->mode = BQ2415X_MODE_OFF;
1596         bq->reported_mode = BQ2415X_MODE_OFF;
1597         bq->autotimer = 0;
1598         bq->automode = 0;
1599
1600         if (np || ACPI_HANDLE(bq->dev)) {
1601                 ret = device_property_read_u32(bq->dev,
1602                                                "ti,current-limit",
1603                                                &bq->init_data.current_limit);
1604                 if (ret)
1605                         goto error_2;
1606                 ret = device_property_read_u32(bq->dev,
1607                                         "ti,weak-battery-voltage",
1608                                         &bq->init_data.weak_battery_voltage);
1609                 if (ret)
1610                         goto error_2;
1611                 ret = device_property_read_u32(bq->dev,
1612                                 "ti,battery-regulation-voltage",
1613                                 &bq->init_data.battery_regulation_voltage);
1614                 if (ret)
1615                         goto error_2;
1616                 ret = device_property_read_u32(bq->dev,
1617                                                "ti,charge-current",
1618                                                &bq->init_data.charge_current);
1619                 if (ret)
1620                         goto error_2;
1621                 ret = device_property_read_u32(bq->dev,
1622                                 "ti,termination-current",
1623                                 &bq->init_data.termination_current);
1624                 if (ret)
1625                         goto error_2;
1626                 ret = device_property_read_u32(bq->dev,
1627                                                "ti,resistor-sense",
1628                                                &bq->init_data.resistor_sense);
1629                 if (ret)
1630                         goto error_2;
1631                 if (np)
1632                         bq->notify_node = of_parse_phandle(np,
1633                                                 "ti,usb-charger-detection", 0);
1634         } else {
1635                 memcpy(&bq->init_data, pdata, sizeof(bq->init_data));
1636         }
1637
1638         bq2415x_reset_chip(bq);
1639
1640         ret = bq2415x_power_supply_init(bq);
1641         if (ret) {
1642                 dev_err(bq->dev, "failed to register power supply: %d\n", ret);
1643                 goto error_2;
1644         }
1645
1646         ret = bq2415x_sysfs_init(bq);
1647         if (ret) {
1648                 dev_err(bq->dev, "failed to create sysfs entries: %d\n", ret);
1649                 goto error_3;
1650         }
1651
1652         ret = bq2415x_set_defaults(bq);
1653         if (ret) {
1654                 dev_err(bq->dev, "failed to set default values: %d\n", ret);
1655                 goto error_4;
1656         }
1657
1658         if (bq->notify_node || bq->init_data.notify_device) {
1659                 bq->nb.notifier_call = bq2415x_notifier_call;
1660                 ret = power_supply_reg_notifier(&bq->nb);
1661                 if (ret) {
1662                         dev_err(bq->dev, "failed to reg notifier: %d\n", ret);
1663                         goto error_4;
1664                 }
1665
1666                 bq->automode = 1;
1667                 dev_info(bq->dev, "automode supported, waiting for events\n");
1668         } else {
1669                 bq->automode = -1;
1670                 dev_info(bq->dev, "automode not supported\n");
1671         }
1672
1673         /* Query for initial reported_mode and set it */
1674         if (bq->nb.notifier_call) {
1675                 if (np) {
1676                         notify_psy = power_supply_get_by_phandle(np,
1677                                                 "ti,usb-charger-detection");
1678                         if (IS_ERR(notify_psy))
1679                                 notify_psy = NULL;
1680                 } else if (bq->init_data.notify_device) {
1681                         notify_psy = power_supply_get_by_name(
1682                                                 bq->init_data.notify_device);
1683                 }
1684         }
1685         if (notify_psy) {
1686                 ret = power_supply_get_property(notify_psy,
1687                                         POWER_SUPPLY_PROP_CURRENT_MAX, &prop);
1688                 power_supply_put(notify_psy);
1689
1690                 if (ret == 0) {
1691                         bq2415x_update_reported_mode(bq, prop.intval);
1692                         bq2415x_set_mode(bq, bq->reported_mode);
1693                 }
1694         }
1695
1696         INIT_DELAYED_WORK(&bq->work, bq2415x_timer_work);
1697         bq2415x_set_autotimer(bq, 1);
1698
1699         dev_info(bq->dev, "driver registered\n");
1700         return 0;
1701
1702 error_4:
1703         bq2415x_sysfs_exit(bq);
1704 error_3:
1705         bq2415x_power_supply_exit(bq);
1706 error_2:
1707         if (bq && bq->notify_node)
1708                 of_node_put(bq->notify_node);
1709         kfree(name);
1710 error_1:
1711         mutex_lock(&bq2415x_id_mutex);
1712         idr_remove(&bq2415x_id, num);
1713         mutex_unlock(&bq2415x_id_mutex);
1714
1715         return ret;
1716 }
1717
1718 /* main bq2415x remove function */
1719
1720 static int bq2415x_remove(struct i2c_client *client)
1721 {
1722         struct bq2415x_device *bq = i2c_get_clientdata(client);
1723
1724         if (bq->nb.notifier_call)
1725                 power_supply_unreg_notifier(&bq->nb);
1726
1727         if (bq->notify_node)
1728                 of_node_put(bq->notify_node);
1729
1730         bq2415x_sysfs_exit(bq);
1731         bq2415x_power_supply_exit(bq);
1732
1733         bq2415x_reset_chip(bq);
1734
1735         mutex_lock(&bq2415x_id_mutex);
1736         idr_remove(&bq2415x_id, bq->id);
1737         mutex_unlock(&bq2415x_id_mutex);
1738
1739         dev_info(bq->dev, "driver unregistered\n");
1740
1741         kfree(bq->name);
1742
1743         return 0;
1744 }
1745
1746 static const struct i2c_device_id bq2415x_i2c_id_table[] = {
1747         { "bq2415x", BQUNKNOWN },
1748         { "bq24150", BQ24150 },
1749         { "bq24150a", BQ24150A },
1750         { "bq24151", BQ24151 },
1751         { "bq24151a", BQ24151A },
1752         { "bq24152", BQ24152 },
1753         { "bq24153", BQ24153 },
1754         { "bq24153a", BQ24153A },
1755         { "bq24155", BQ24155 },
1756         { "bq24156", BQ24156 },
1757         { "bq24156a", BQ24156A },
1758         { "bq24157s", BQ24157S },
1759         { "bq24158", BQ24158 },
1760         {},
1761 };
1762 MODULE_DEVICE_TABLE(i2c, bq2415x_i2c_id_table);
1763
1764 static const struct acpi_device_id bq2415x_i2c_acpi_match[] = {
1765         { "BQ2415X", BQUNKNOWN },
1766         { "BQ241500", BQ24150 },
1767         { "BQA24150", BQ24150A },
1768         { "BQ241510", BQ24151 },
1769         { "BQA24151", BQ24151A },
1770         { "BQ241520", BQ24152 },
1771         { "BQ241530", BQ24153 },
1772         { "BQA24153", BQ24153A },
1773         { "BQ241550", BQ24155 },
1774         { "BQ241560", BQ24156 },
1775         { "BQA24156", BQ24156A },
1776         { "BQS24157", BQ24157S },
1777         { "BQ241580", BQ24158 },
1778         {},
1779 };
1780 MODULE_DEVICE_TABLE(acpi, bq2415x_i2c_acpi_match);
1781
1782 static struct i2c_driver bq2415x_driver = {
1783         .driver = {
1784                 .name = "bq2415x-charger",
1785                 .acpi_match_table = ACPI_PTR(bq2415x_i2c_acpi_match),
1786         },
1787         .probe = bq2415x_probe,
1788         .remove = bq2415x_remove,
1789         .id_table = bq2415x_i2c_id_table,
1790 };
1791 module_i2c_driver(bq2415x_driver);
1792
1793 MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
1794 MODULE_DESCRIPTION("bq2415x charger driver");
1795 MODULE_LICENSE("GPL");