treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
[sfrench/cifs-2.6.git] / drivers / power / supply / bq2415x_charger.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * bq2415x charger driver
4  *
5  * Copyright (C) 2011-2013  Pali Rohár <pali.rohar@gmail.com>
6  *
7  * Datasheets:
8  * http://www.ti.com/product/bq24150
9  * http://www.ti.com/product/bq24150a
10  * http://www.ti.com/product/bq24152
11  * http://www.ti.com/product/bq24153
12  * http://www.ti.com/product/bq24153a
13  * http://www.ti.com/product/bq24155
14  * http://www.ti.com/product/bq24157s
15  * http://www.ti.com/product/bq24158
16  */
17
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/param.h>
21 #include <linux/err.h>
22 #include <linux/workqueue.h>
23 #include <linux/sysfs.h>
24 #include <linux/platform_device.h>
25 #include <linux/power_supply.h>
26 #include <linux/idr.h>
27 #include <linux/i2c.h>
28 #include <linux/slab.h>
29 #include <linux/acpi.h>
30
31 #include <linux/power/bq2415x_charger.h>
32
33 /* timeout for resetting chip timer */
34 #define BQ2415X_TIMER_TIMEOUT           10
35
36 #define BQ2415X_REG_STATUS              0x00
37 #define BQ2415X_REG_CONTROL             0x01
38 #define BQ2415X_REG_VOLTAGE             0x02
39 #define BQ2415X_REG_VENDER              0x03
40 #define BQ2415X_REG_CURRENT             0x04
41
42 /* reset state for all registers */
43 #define BQ2415X_RESET_STATUS            BIT(6)
44 #define BQ2415X_RESET_CONTROL           (BIT(4)|BIT(5))
45 #define BQ2415X_RESET_VOLTAGE           (BIT(1)|BIT(3))
46 #define BQ2415X_RESET_CURRENT           (BIT(0)|BIT(3)|BIT(7))
47
48 /* status register */
49 #define BQ2415X_BIT_TMR_RST             7
50 #define BQ2415X_BIT_OTG                 7
51 #define BQ2415X_BIT_EN_STAT             6
52 #define BQ2415X_MASK_STAT               (BIT(4)|BIT(5))
53 #define BQ2415X_SHIFT_STAT              4
54 #define BQ2415X_BIT_BOOST               3
55 #define BQ2415X_MASK_FAULT              (BIT(0)|BIT(1)|BIT(2))
56 #define BQ2415X_SHIFT_FAULT             0
57
58 /* control register */
59 #define BQ2415X_MASK_LIMIT              (BIT(6)|BIT(7))
60 #define BQ2415X_SHIFT_LIMIT             6
61 #define BQ2415X_MASK_VLOWV              (BIT(4)|BIT(5))
62 #define BQ2415X_SHIFT_VLOWV             4
63 #define BQ2415X_BIT_TE                  3
64 #define BQ2415X_BIT_CE                  2
65 #define BQ2415X_BIT_HZ_MODE             1
66 #define BQ2415X_BIT_OPA_MODE            0
67
68 /* voltage register */
69 #define BQ2415X_MASK_VO         (BIT(2)|BIT(3)|BIT(4)|BIT(5)|BIT(6)|BIT(7))
70 #define BQ2415X_SHIFT_VO                2
71 #define BQ2415X_BIT_OTG_PL              1
72 #define BQ2415X_BIT_OTG_EN              0
73
74 /* vender register */
75 #define BQ2415X_MASK_VENDER             (BIT(5)|BIT(6)|BIT(7))
76 #define BQ2415X_SHIFT_VENDER            5
77 #define BQ2415X_MASK_PN                 (BIT(3)|BIT(4))
78 #define BQ2415X_SHIFT_PN                3
79 #define BQ2415X_MASK_REVISION           (BIT(0)|BIT(1)|BIT(2))
80 #define BQ2415X_SHIFT_REVISION          0
81
82 /* current register */
83 #define BQ2415X_MASK_RESET              BIT(7)
84 #define BQ2415X_MASK_VI_CHRG            (BIT(4)|BIT(5)|BIT(6))
85 #define BQ2415X_SHIFT_VI_CHRG           4
86 /* N/A                                  BIT(3) */
87 #define BQ2415X_MASK_VI_TERM            (BIT(0)|BIT(1)|BIT(2))
88 #define BQ2415X_SHIFT_VI_TERM           0
89
90
91 enum bq2415x_command {
92         BQ2415X_TIMER_RESET,
93         BQ2415X_OTG_STATUS,
94         BQ2415X_STAT_PIN_STATUS,
95         BQ2415X_STAT_PIN_ENABLE,
96         BQ2415X_STAT_PIN_DISABLE,
97         BQ2415X_CHARGE_STATUS,
98         BQ2415X_BOOST_STATUS,
99         BQ2415X_FAULT_STATUS,
100
101         BQ2415X_CHARGE_TERMINATION_STATUS,
102         BQ2415X_CHARGE_TERMINATION_ENABLE,
103         BQ2415X_CHARGE_TERMINATION_DISABLE,
104         BQ2415X_CHARGER_STATUS,
105         BQ2415X_CHARGER_ENABLE,
106         BQ2415X_CHARGER_DISABLE,
107         BQ2415X_HIGH_IMPEDANCE_STATUS,
108         BQ2415X_HIGH_IMPEDANCE_ENABLE,
109         BQ2415X_HIGH_IMPEDANCE_DISABLE,
110         BQ2415X_BOOST_MODE_STATUS,
111         BQ2415X_BOOST_MODE_ENABLE,
112         BQ2415X_BOOST_MODE_DISABLE,
113
114         BQ2415X_OTG_LEVEL,
115         BQ2415X_OTG_ACTIVATE_HIGH,
116         BQ2415X_OTG_ACTIVATE_LOW,
117         BQ2415X_OTG_PIN_STATUS,
118         BQ2415X_OTG_PIN_ENABLE,
119         BQ2415X_OTG_PIN_DISABLE,
120
121         BQ2415X_VENDER_CODE,
122         BQ2415X_PART_NUMBER,
123         BQ2415X_REVISION,
124 };
125
126 enum bq2415x_chip {
127         BQUNKNOWN,
128         BQ24150,
129         BQ24150A,
130         BQ24151,
131         BQ24151A,
132         BQ24152,
133         BQ24153,
134         BQ24153A,
135         BQ24155,
136         BQ24156,
137         BQ24156A,
138         BQ24157S,
139         BQ24158,
140 };
141
142 static char *bq2415x_chip_name[] = {
143         "unknown",
144         "bq24150",
145         "bq24150a",
146         "bq24151",
147         "bq24151a",
148         "bq24152",
149         "bq24153",
150         "bq24153a",
151         "bq24155",
152         "bq24156",
153         "bq24156a",
154         "bq24157s",
155         "bq24158",
156 };
157
158 struct bq2415x_device {
159         struct device *dev;
160         struct bq2415x_platform_data init_data;
161         struct power_supply *charger;
162         struct power_supply_desc charger_desc;
163         struct delayed_work work;
164         struct device_node *notify_node;
165         struct notifier_block nb;
166         enum bq2415x_mode reported_mode;/* mode reported by hook function */
167         enum bq2415x_mode mode;         /* currently configured mode */
168         enum bq2415x_chip chip;
169         const char *timer_error;
170         char *model;
171         char *name;
172         int autotimer;  /* 1 - if driver automatically reset timer, 0 - not */
173         int automode;   /* 1 - enabled, 0 - disabled; -1 - not supported */
174         int id;
175 };
176
177 /* each registered chip must have unique id */
178 static DEFINE_IDR(bq2415x_id);
179
180 static DEFINE_MUTEX(bq2415x_id_mutex);
181 static DEFINE_MUTEX(bq2415x_timer_mutex);
182 static DEFINE_MUTEX(bq2415x_i2c_mutex);
183
184 /**** i2c read functions ****/
185
186 /* read value from register */
187 static int bq2415x_i2c_read(struct bq2415x_device *bq, u8 reg)
188 {
189         struct i2c_client *client = to_i2c_client(bq->dev);
190         struct i2c_msg msg[2];
191         u8 val;
192         int ret;
193
194         if (!client->adapter)
195                 return -ENODEV;
196
197         msg[0].addr = client->addr;
198         msg[0].flags = 0;
199         msg[0].buf = &reg;
200         msg[0].len = sizeof(reg);
201         msg[1].addr = client->addr;
202         msg[1].flags = I2C_M_RD;
203         msg[1].buf = &val;
204         msg[1].len = sizeof(val);
205
206         mutex_lock(&bq2415x_i2c_mutex);
207         ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
208         mutex_unlock(&bq2415x_i2c_mutex);
209
210         if (ret < 0)
211                 return ret;
212
213         return val;
214 }
215
216 /* read value from register, apply mask and right shift it */
217 static int bq2415x_i2c_read_mask(struct bq2415x_device *bq, u8 reg,
218                                  u8 mask, u8 shift)
219 {
220         int ret;
221
222         if (shift > 8)
223                 return -EINVAL;
224
225         ret = bq2415x_i2c_read(bq, reg);
226         if (ret < 0)
227                 return ret;
228         return (ret & mask) >> shift;
229 }
230
231 /* read value from register and return one specified bit */
232 static int bq2415x_i2c_read_bit(struct bq2415x_device *bq, u8 reg, u8 bit)
233 {
234         if (bit > 8)
235                 return -EINVAL;
236         return bq2415x_i2c_read_mask(bq, reg, BIT(bit), bit);
237 }
238
239 /**** i2c write functions ****/
240
241 /* write value to register */
242 static int bq2415x_i2c_write(struct bq2415x_device *bq, u8 reg, u8 val)
243 {
244         struct i2c_client *client = to_i2c_client(bq->dev);
245         struct i2c_msg msg[1];
246         u8 data[2];
247         int ret;
248
249         data[0] = reg;
250         data[1] = val;
251
252         msg[0].addr = client->addr;
253         msg[0].flags = 0;
254         msg[0].buf = data;
255         msg[0].len = ARRAY_SIZE(data);
256
257         mutex_lock(&bq2415x_i2c_mutex);
258         ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
259         mutex_unlock(&bq2415x_i2c_mutex);
260
261         /* i2c_transfer returns number of messages transferred */
262         if (ret < 0)
263                 return ret;
264         else if (ret != 1)
265                 return -EIO;
266
267         return 0;
268 }
269
270 /* read value from register, change it with mask left shifted and write back */
271 static int bq2415x_i2c_write_mask(struct bq2415x_device *bq, u8 reg, u8 val,
272                                   u8 mask, u8 shift)
273 {
274         int ret;
275
276         if (shift > 8)
277                 return -EINVAL;
278
279         ret = bq2415x_i2c_read(bq, reg);
280         if (ret < 0)
281                 return ret;
282
283         ret &= ~mask;
284         ret |= val << shift;
285
286         return bq2415x_i2c_write(bq, reg, ret);
287 }
288
289 /* change only one bit in register */
290 static int bq2415x_i2c_write_bit(struct bq2415x_device *bq, u8 reg,
291                                  bool val, u8 bit)
292 {
293         if (bit > 8)
294                 return -EINVAL;
295         return bq2415x_i2c_write_mask(bq, reg, val, BIT(bit), bit);
296 }
297
298 /**** global functions ****/
299
300 /* exec command function */
301 static int bq2415x_exec_command(struct bq2415x_device *bq,
302                                 enum bq2415x_command command)
303 {
304         int ret;
305
306         switch (command) {
307         case BQ2415X_TIMER_RESET:
308                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS,
309                                 1, BQ2415X_BIT_TMR_RST);
310         case BQ2415X_OTG_STATUS:
311                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS,
312                                 BQ2415X_BIT_OTG);
313         case BQ2415X_STAT_PIN_STATUS:
314                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS,
315                                 BQ2415X_BIT_EN_STAT);
316         case BQ2415X_STAT_PIN_ENABLE:
317                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS, 1,
318                                 BQ2415X_BIT_EN_STAT);
319         case BQ2415X_STAT_PIN_DISABLE:
320                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS, 0,
321                                 BQ2415X_BIT_EN_STAT);
322         case BQ2415X_CHARGE_STATUS:
323                 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_STATUS,
324                                 BQ2415X_MASK_STAT, BQ2415X_SHIFT_STAT);
325         case BQ2415X_BOOST_STATUS:
326                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS,
327                                 BQ2415X_BIT_BOOST);
328         case BQ2415X_FAULT_STATUS:
329                 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_STATUS,
330                         BQ2415X_MASK_FAULT, BQ2415X_SHIFT_FAULT);
331
332         case BQ2415X_CHARGE_TERMINATION_STATUS:
333                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
334                                 BQ2415X_BIT_TE);
335         case BQ2415X_CHARGE_TERMINATION_ENABLE:
336                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
337                                 1, BQ2415X_BIT_TE);
338         case BQ2415X_CHARGE_TERMINATION_DISABLE:
339                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
340                                 0, BQ2415X_BIT_TE);
341         case BQ2415X_CHARGER_STATUS:
342                 ret = bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
343                         BQ2415X_BIT_CE);
344                 if (ret < 0)
345                         return ret;
346                 return ret > 0 ? 0 : 1;
347         case BQ2415X_CHARGER_ENABLE:
348                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
349                                 0, BQ2415X_BIT_CE);
350         case BQ2415X_CHARGER_DISABLE:
351                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
352                                 1, BQ2415X_BIT_CE);
353         case BQ2415X_HIGH_IMPEDANCE_STATUS:
354                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
355                                 BQ2415X_BIT_HZ_MODE);
356         case BQ2415X_HIGH_IMPEDANCE_ENABLE:
357                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
358                                 1, BQ2415X_BIT_HZ_MODE);
359         case BQ2415X_HIGH_IMPEDANCE_DISABLE:
360                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
361                                 0, BQ2415X_BIT_HZ_MODE);
362         case BQ2415X_BOOST_MODE_STATUS:
363                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
364                                 BQ2415X_BIT_OPA_MODE);
365         case BQ2415X_BOOST_MODE_ENABLE:
366                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
367                                 1, BQ2415X_BIT_OPA_MODE);
368         case BQ2415X_BOOST_MODE_DISABLE:
369                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
370                                 0, BQ2415X_BIT_OPA_MODE);
371
372         case BQ2415X_OTG_LEVEL:
373                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_VOLTAGE,
374                                 BQ2415X_BIT_OTG_PL);
375         case BQ2415X_OTG_ACTIVATE_HIGH:
376                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
377                                 1, BQ2415X_BIT_OTG_PL);
378         case BQ2415X_OTG_ACTIVATE_LOW:
379                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
380                                 0, BQ2415X_BIT_OTG_PL);
381         case BQ2415X_OTG_PIN_STATUS:
382                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_VOLTAGE,
383                                 BQ2415X_BIT_OTG_EN);
384         case BQ2415X_OTG_PIN_ENABLE:
385                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
386                                 1, BQ2415X_BIT_OTG_EN);
387         case BQ2415X_OTG_PIN_DISABLE:
388                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
389                                 0, BQ2415X_BIT_OTG_EN);
390
391         case BQ2415X_VENDER_CODE:
392                 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER,
393                         BQ2415X_MASK_VENDER, BQ2415X_SHIFT_VENDER);
394         case BQ2415X_PART_NUMBER:
395                 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER,
396                                 BQ2415X_MASK_PN, BQ2415X_SHIFT_PN);
397         case BQ2415X_REVISION:
398                 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER,
399                         BQ2415X_MASK_REVISION, BQ2415X_SHIFT_REVISION);
400         }
401         return -EINVAL;
402 }
403
404 /* detect chip type */
405 static enum bq2415x_chip bq2415x_detect_chip(struct bq2415x_device *bq)
406 {
407         struct i2c_client *client = to_i2c_client(bq->dev);
408         int ret = bq2415x_exec_command(bq, BQ2415X_PART_NUMBER);
409
410         if (ret < 0)
411                 return ret;
412
413         switch (client->addr) {
414         case 0x6b:
415                 switch (ret) {
416                 case 0:
417                         if (bq->chip == BQ24151A)
418                                 return bq->chip;
419                         return BQ24151;
420                 case 1:
421                         if (bq->chip == BQ24150A ||
422                                 bq->chip == BQ24152 ||
423                                 bq->chip == BQ24155)
424                                 return bq->chip;
425                         return BQ24150;
426                 case 2:
427                         if (bq->chip == BQ24153A)
428                                 return bq->chip;
429                         return BQ24153;
430                 default:
431                         return BQUNKNOWN;
432                 }
433                 break;
434
435         case 0x6a:
436                 switch (ret) {
437                 case 0:
438                         if (bq->chip == BQ24156A)
439                                 return bq->chip;
440                         return BQ24156;
441                 case 2:
442                         if (bq->chip == BQ24157S)
443                                 return bq->chip;
444                         return BQ24158;
445                 default:
446                         return BQUNKNOWN;
447                 }
448                 break;
449         }
450
451         return BQUNKNOWN;
452 }
453
454 /* detect chip revision */
455 static int bq2415x_detect_revision(struct bq2415x_device *bq)
456 {
457         int ret = bq2415x_exec_command(bq, BQ2415X_REVISION);
458         int chip = bq2415x_detect_chip(bq);
459
460         if (ret < 0 || chip < 0)
461                 return -1;
462
463         switch (chip) {
464         case BQ24150:
465         case BQ24150A:
466         case BQ24151:
467         case BQ24151A:
468         case BQ24152:
469                 if (ret >= 0 && ret <= 3)
470                         return ret;
471                 return -1;
472         case BQ24153:
473         case BQ24153A:
474         case BQ24156:
475         case BQ24156A:
476         case BQ24157S:
477         case BQ24158:
478                 if (ret == 3)
479                         return 0;
480                 else if (ret == 1)
481                         return 1;
482                 return -1;
483         case BQ24155:
484                 if (ret == 3)
485                         return 3;
486                 return -1;
487         case BQUNKNOWN:
488                 return -1;
489         }
490
491         return -1;
492 }
493
494 /* return chip vender code */
495 static int bq2415x_get_vender_code(struct bq2415x_device *bq)
496 {
497         int ret;
498
499         ret = bq2415x_exec_command(bq, BQ2415X_VENDER_CODE);
500         if (ret < 0)
501                 return 0;
502
503         /* convert to binary */
504         return (ret & 0x1) +
505                ((ret >> 1) & 0x1) * 10 +
506                ((ret >> 2) & 0x1) * 100;
507 }
508
509 /* reset all chip registers to default state */
510 static void bq2415x_reset_chip(struct bq2415x_device *bq)
511 {
512         bq2415x_i2c_write(bq, BQ2415X_REG_CURRENT, BQ2415X_RESET_CURRENT);
513         bq2415x_i2c_write(bq, BQ2415X_REG_VOLTAGE, BQ2415X_RESET_VOLTAGE);
514         bq2415x_i2c_write(bq, BQ2415X_REG_CONTROL, BQ2415X_RESET_CONTROL);
515         bq2415x_i2c_write(bq, BQ2415X_REG_STATUS, BQ2415X_RESET_STATUS);
516         bq->timer_error = NULL;
517 }
518
519 /**** properties functions ****/
520
521 /* set current limit in mA */
522 static int bq2415x_set_current_limit(struct bq2415x_device *bq, int mA)
523 {
524         int val;
525
526         if (mA <= 100)
527                 val = 0;
528         else if (mA <= 500)
529                 val = 1;
530         else if (mA <= 800)
531                 val = 2;
532         else
533                 val = 3;
534
535         return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CONTROL, val,
536                         BQ2415X_MASK_LIMIT, BQ2415X_SHIFT_LIMIT);
537 }
538
539 /* get current limit in mA */
540 static int bq2415x_get_current_limit(struct bq2415x_device *bq)
541 {
542         int ret;
543
544         ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CONTROL,
545                         BQ2415X_MASK_LIMIT, BQ2415X_SHIFT_LIMIT);
546         if (ret < 0)
547                 return ret;
548         else if (ret == 0)
549                 return 100;
550         else if (ret == 1)
551                 return 500;
552         else if (ret == 2)
553                 return 800;
554         else if (ret == 3)
555                 return 1800;
556         return -EINVAL;
557 }
558
559 /* set weak battery voltage in mV */
560 static int bq2415x_set_weak_battery_voltage(struct bq2415x_device *bq, int mV)
561 {
562         int val;
563
564         /* round to 100mV */
565         if (mV <= 3400 + 50)
566                 val = 0;
567         else if (mV <= 3500 + 50)
568                 val = 1;
569         else if (mV <= 3600 + 50)
570                 val = 2;
571         else
572                 val = 3;
573
574         return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CONTROL, val,
575                         BQ2415X_MASK_VLOWV, BQ2415X_SHIFT_VLOWV);
576 }
577
578 /* get weak battery voltage in mV */
579 static int bq2415x_get_weak_battery_voltage(struct bq2415x_device *bq)
580 {
581         int ret;
582
583         ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CONTROL,
584                         BQ2415X_MASK_VLOWV, BQ2415X_SHIFT_VLOWV);
585         if (ret < 0)
586                 return ret;
587         return 100 * (34 + ret);
588 }
589
590 /* set battery regulation voltage in mV */
591 static int bq2415x_set_battery_regulation_voltage(struct bq2415x_device *bq,
592                                                   int mV)
593 {
594         int val = (mV/10 - 350) / 2;
595
596         /*
597          * According to datasheet, maximum battery regulation voltage is
598          * 4440mV which is b101111 = 47.
599          */
600         if (val < 0)
601                 val = 0;
602         else if (val > 47)
603                 return -EINVAL;
604
605         return bq2415x_i2c_write_mask(bq, BQ2415X_REG_VOLTAGE, val,
606                         BQ2415X_MASK_VO, BQ2415X_SHIFT_VO);
607 }
608
609 /* get battery regulation voltage in mV */
610 static int bq2415x_get_battery_regulation_voltage(struct bq2415x_device *bq)
611 {
612         int ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_VOLTAGE,
613                         BQ2415X_MASK_VO, BQ2415X_SHIFT_VO);
614
615         if (ret < 0)
616                 return ret;
617         return 10 * (350 + 2*ret);
618 }
619
620 /* set charge current in mA (platform data must provide resistor sense) */
621 static int bq2415x_set_charge_current(struct bq2415x_device *bq, int mA)
622 {
623         int val;
624
625         if (bq->init_data.resistor_sense <= 0)
626                 return -EINVAL;
627
628         val = (mA * bq->init_data.resistor_sense - 37400) / 6800;
629         if (val < 0)
630                 val = 0;
631         else if (val > 7)
632                 val = 7;
633
634         return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CURRENT, val,
635                         BQ2415X_MASK_VI_CHRG | BQ2415X_MASK_RESET,
636                         BQ2415X_SHIFT_VI_CHRG);
637 }
638
639 /* get charge current in mA (platform data must provide resistor sense) */
640 static int bq2415x_get_charge_current(struct bq2415x_device *bq)
641 {
642         int ret;
643
644         if (bq->init_data.resistor_sense <= 0)
645                 return -EINVAL;
646
647         ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CURRENT,
648                         BQ2415X_MASK_VI_CHRG, BQ2415X_SHIFT_VI_CHRG);
649         if (ret < 0)
650                 return ret;
651         return (37400 + 6800*ret) / bq->init_data.resistor_sense;
652 }
653
654 /* set termination current in mA (platform data must provide resistor sense) */
655 static int bq2415x_set_termination_current(struct bq2415x_device *bq, int mA)
656 {
657         int val;
658
659         if (bq->init_data.resistor_sense <= 0)
660                 return -EINVAL;
661
662         val = (mA * bq->init_data.resistor_sense - 3400) / 3400;
663         if (val < 0)
664                 val = 0;
665         else if (val > 7)
666                 val = 7;
667
668         return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CURRENT, val,
669                         BQ2415X_MASK_VI_TERM | BQ2415X_MASK_RESET,
670                         BQ2415X_SHIFT_VI_TERM);
671 }
672
673 /* get termination current in mA (platform data must provide resistor sense) */
674 static int bq2415x_get_termination_current(struct bq2415x_device *bq)
675 {
676         int ret;
677
678         if (bq->init_data.resistor_sense <= 0)
679                 return -EINVAL;
680
681         ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CURRENT,
682                         BQ2415X_MASK_VI_TERM, BQ2415X_SHIFT_VI_TERM);
683         if (ret < 0)
684                 return ret;
685         return (3400 + 3400*ret) / bq->init_data.resistor_sense;
686 }
687
688 /* set default value of property */
689 #define bq2415x_set_default_value(bq, prop) \
690         do { \
691                 int ret = 0; \
692                 if (bq->init_data.prop != -1) \
693                         ret = bq2415x_set_##prop(bq, bq->init_data.prop); \
694                 if (ret < 0) \
695                         return ret; \
696         } while (0)
697
698 /* set default values of all properties */
699 static int bq2415x_set_defaults(struct bq2415x_device *bq)
700 {
701         bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_DISABLE);
702         bq2415x_exec_command(bq, BQ2415X_CHARGER_DISABLE);
703         bq2415x_exec_command(bq, BQ2415X_CHARGE_TERMINATION_DISABLE);
704
705         bq2415x_set_default_value(bq, current_limit);
706         bq2415x_set_default_value(bq, weak_battery_voltage);
707         bq2415x_set_default_value(bq, battery_regulation_voltage);
708
709         if (bq->init_data.resistor_sense > 0) {
710                 bq2415x_set_default_value(bq, charge_current);
711                 bq2415x_set_default_value(bq, termination_current);
712                 bq2415x_exec_command(bq, BQ2415X_CHARGE_TERMINATION_ENABLE);
713         }
714
715         bq2415x_exec_command(bq, BQ2415X_CHARGER_ENABLE);
716         return 0;
717 }
718
719 /**** charger mode functions ****/
720
721 /* set charger mode */
722 static int bq2415x_set_mode(struct bq2415x_device *bq, enum bq2415x_mode mode)
723 {
724         int ret = 0;
725         int charger = 0;
726         int boost = 0;
727
728         if (mode == BQ2415X_MODE_BOOST)
729                 boost = 1;
730         else if (mode != BQ2415X_MODE_OFF)
731                 charger = 1;
732
733         if (!charger)
734                 ret = bq2415x_exec_command(bq, BQ2415X_CHARGER_DISABLE);
735
736         if (!boost)
737                 ret = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_DISABLE);
738
739         if (ret < 0)
740                 return ret;
741
742         switch (mode) {
743         case BQ2415X_MODE_OFF:
744                 dev_dbg(bq->dev, "changing mode to: Offline\n");
745                 ret = bq2415x_set_current_limit(bq, 100);
746                 break;
747         case BQ2415X_MODE_NONE:
748                 dev_dbg(bq->dev, "changing mode to: N/A\n");
749                 ret = bq2415x_set_current_limit(bq, 100);
750                 break;
751         case BQ2415X_MODE_HOST_CHARGER:
752                 dev_dbg(bq->dev, "changing mode to: Host/HUB charger\n");
753                 ret = bq2415x_set_current_limit(bq, 500);
754                 break;
755         case BQ2415X_MODE_DEDICATED_CHARGER:
756                 dev_dbg(bq->dev, "changing mode to: Dedicated charger\n");
757                 ret = bq2415x_set_current_limit(bq, 1800);
758                 break;
759         case BQ2415X_MODE_BOOST: /* Boost mode */
760                 dev_dbg(bq->dev, "changing mode to: Boost\n");
761                 ret = bq2415x_set_current_limit(bq, 100);
762                 break;
763         }
764
765         if (ret < 0)
766                 return ret;
767
768         if (charger)
769                 ret = bq2415x_exec_command(bq, BQ2415X_CHARGER_ENABLE);
770         else if (boost)
771                 ret = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_ENABLE);
772
773         if (ret < 0)
774                 return ret;
775
776         bq2415x_set_default_value(bq, weak_battery_voltage);
777         bq2415x_set_default_value(bq, battery_regulation_voltage);
778
779         bq->mode = mode;
780         sysfs_notify(&bq->charger->dev.kobj, NULL, "mode");
781
782         return 0;
783
784 }
785
786 static bool bq2415x_update_reported_mode(struct bq2415x_device *bq, int mA)
787 {
788         enum bq2415x_mode mode;
789
790         if (mA == 0)
791                 mode = BQ2415X_MODE_OFF;
792         else if (mA < 500)
793                 mode = BQ2415X_MODE_NONE;
794         else if (mA < 1800)
795                 mode = BQ2415X_MODE_HOST_CHARGER;
796         else
797                 mode = BQ2415X_MODE_DEDICATED_CHARGER;
798
799         if (bq->reported_mode == mode)
800                 return false;
801
802         bq->reported_mode = mode;
803         return true;
804 }
805
806 static int bq2415x_notifier_call(struct notifier_block *nb,
807                 unsigned long val, void *v)
808 {
809         struct bq2415x_device *bq =
810                 container_of(nb, struct bq2415x_device, nb);
811         struct power_supply *psy = v;
812         union power_supply_propval prop;
813         int ret;
814
815         if (val != PSY_EVENT_PROP_CHANGED)
816                 return NOTIFY_OK;
817
818         /* Ignore event if it was not send by notify_node/notify_device */
819         if (bq->notify_node) {
820                 if (!psy->dev.parent ||
821                     psy->dev.parent->of_node != bq->notify_node)
822                         return NOTIFY_OK;
823         } else if (bq->init_data.notify_device) {
824                 if (strcmp(psy->desc->name, bq->init_data.notify_device) != 0)
825                         return NOTIFY_OK;
826         }
827
828         dev_dbg(bq->dev, "notifier call was called\n");
829
830         ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_CURRENT_MAX,
831                         &prop);
832         if (ret != 0)
833                 return NOTIFY_OK;
834
835         if (!bq2415x_update_reported_mode(bq, prop.intval))
836                 return NOTIFY_OK;
837
838         /* if automode is not enabled do not tell about reported_mode */
839         if (bq->automode < 1)
840                 return NOTIFY_OK;
841
842         schedule_delayed_work(&bq->work, 0);
843
844         return NOTIFY_OK;
845 }
846
847 /**** timer functions ****/
848
849 /* enable/disable auto resetting chip timer */
850 static void bq2415x_set_autotimer(struct bq2415x_device *bq, int state)
851 {
852         mutex_lock(&bq2415x_timer_mutex);
853
854         if (bq->autotimer == state) {
855                 mutex_unlock(&bq2415x_timer_mutex);
856                 return;
857         }
858
859         bq->autotimer = state;
860
861         if (state) {
862                 schedule_delayed_work(&bq->work, BQ2415X_TIMER_TIMEOUT * HZ);
863                 bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
864                 bq->timer_error = NULL;
865         } else {
866                 cancel_delayed_work_sync(&bq->work);
867         }
868
869         mutex_unlock(&bq2415x_timer_mutex);
870 }
871
872 /* called by bq2415x_timer_work on timer error */
873 static void bq2415x_timer_error(struct bq2415x_device *bq, const char *msg)
874 {
875         bq->timer_error = msg;
876         sysfs_notify(&bq->charger->dev.kobj, NULL, "timer");
877         dev_err(bq->dev, "%s\n", msg);
878         if (bq->automode > 0)
879                 bq->automode = 0;
880         bq2415x_set_mode(bq, BQ2415X_MODE_OFF);
881         bq2415x_set_autotimer(bq, 0);
882 }
883
884 /* delayed work function for auto resetting chip timer */
885 static void bq2415x_timer_work(struct work_struct *work)
886 {
887         struct bq2415x_device *bq = container_of(work, struct bq2415x_device,
888                                                  work.work);
889         int ret;
890         int error;
891         int boost;
892
893         if (bq->automode > 0 && (bq->reported_mode != bq->mode)) {
894                 sysfs_notify(&bq->charger->dev.kobj, NULL, "reported_mode");
895                 bq2415x_set_mode(bq, bq->reported_mode);
896         }
897
898         if (!bq->autotimer)
899                 return;
900
901         ret = bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
902         if (ret < 0) {
903                 bq2415x_timer_error(bq, "Resetting timer failed");
904                 return;
905         }
906
907         boost = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_STATUS);
908         if (boost < 0) {
909                 bq2415x_timer_error(bq, "Unknown error");
910                 return;
911         }
912
913         error = bq2415x_exec_command(bq, BQ2415X_FAULT_STATUS);
914         if (error < 0) {
915                 bq2415x_timer_error(bq, "Unknown error");
916                 return;
917         }
918
919         if (boost) {
920                 switch (error) {
921                 /* Non fatal errors, chip is OK */
922                 case 0: /* No error */
923                         break;
924                 case 6: /* Timer expired */
925                         dev_err(bq->dev, "Timer expired\n");
926                         break;
927                 case 3: /* Battery voltage too low */
928                         dev_err(bq->dev, "Battery voltage to low\n");
929                         break;
930
931                 /* Fatal errors, disable and reset chip */
932                 case 1: /* Overvoltage protection (chip fried) */
933                         bq2415x_timer_error(bq,
934                                 "Overvoltage protection (chip fried)");
935                         return;
936                 case 2: /* Overload */
937                         bq2415x_timer_error(bq, "Overload");
938                         return;
939                 case 4: /* Battery overvoltage protection */
940                         bq2415x_timer_error(bq,
941                                 "Battery overvoltage protection");
942                         return;
943                 case 5: /* Thermal shutdown (too hot) */
944                         bq2415x_timer_error(bq,
945                                         "Thermal shutdown (too hot)");
946                         return;
947                 case 7: /* N/A */
948                         bq2415x_timer_error(bq, "Unknown error");
949                         return;
950                 }
951         } else {
952                 switch (error) {
953                 /* Non fatal errors, chip is OK */
954                 case 0: /* No error */
955                         break;
956                 case 2: /* Sleep mode */
957                         dev_err(bq->dev, "Sleep mode\n");
958                         break;
959                 case 3: /* Poor input source */
960                         dev_err(bq->dev, "Poor input source\n");
961                         break;
962                 case 6: /* Timer expired */
963                         dev_err(bq->dev, "Timer expired\n");
964                         break;
965                 case 7: /* No battery */
966                         dev_err(bq->dev, "No battery\n");
967                         break;
968
969                 /* Fatal errors, disable and reset chip */
970                 case 1: /* Overvoltage protection (chip fried) */
971                         bq2415x_timer_error(bq,
972                                 "Overvoltage protection (chip fried)");
973                         return;
974                 case 4: /* Battery overvoltage protection */
975                         bq2415x_timer_error(bq,
976                                 "Battery overvoltage protection");
977                         return;
978                 case 5: /* Thermal shutdown (too hot) */
979                         bq2415x_timer_error(bq,
980                                 "Thermal shutdown (too hot)");
981                         return;
982                 }
983         }
984
985         schedule_delayed_work(&bq->work, BQ2415X_TIMER_TIMEOUT * HZ);
986 }
987
988 /**** power supply interface code ****/
989
990 static enum power_supply_property bq2415x_power_supply_props[] = {
991         /* TODO: maybe add more power supply properties */
992         POWER_SUPPLY_PROP_STATUS,
993         POWER_SUPPLY_PROP_MODEL_NAME,
994 };
995
996 static int bq2415x_power_supply_get_property(struct power_supply *psy,
997                                              enum power_supply_property psp,
998                                              union power_supply_propval *val)
999 {
1000         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1001         int ret;
1002
1003         switch (psp) {
1004         case POWER_SUPPLY_PROP_STATUS:
1005                 ret = bq2415x_exec_command(bq, BQ2415X_CHARGE_STATUS);
1006                 if (ret < 0)
1007                         return ret;
1008                 else if (ret == 0) /* Ready */
1009                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
1010                 else if (ret == 1) /* Charge in progress */
1011                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
1012                 else if (ret == 2) /* Charge done */
1013                         val->intval = POWER_SUPPLY_STATUS_FULL;
1014                 else
1015                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
1016                 break;
1017         case POWER_SUPPLY_PROP_MODEL_NAME:
1018                 val->strval = bq->model;
1019                 break;
1020         default:
1021                 return -EINVAL;
1022         }
1023         return 0;
1024 }
1025
1026 static void bq2415x_power_supply_exit(struct bq2415x_device *bq)
1027 {
1028         bq->autotimer = 0;
1029         if (bq->automode > 0)
1030                 bq->automode = 0;
1031         cancel_delayed_work_sync(&bq->work);
1032         power_supply_unregister(bq->charger);
1033         kfree(bq->model);
1034 }
1035
1036 /**** additional sysfs entries for power supply interface ****/
1037
1038 /* show *_status entries */
1039 static ssize_t bq2415x_sysfs_show_status(struct device *dev,
1040                                          struct device_attribute *attr,
1041                                          char *buf)
1042 {
1043         struct power_supply *psy = dev_get_drvdata(dev);
1044         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1045         enum bq2415x_command command;
1046         int ret;
1047
1048         if (strcmp(attr->attr.name, "otg_status") == 0)
1049                 command = BQ2415X_OTG_STATUS;
1050         else if (strcmp(attr->attr.name, "charge_status") == 0)
1051                 command = BQ2415X_CHARGE_STATUS;
1052         else if (strcmp(attr->attr.name, "boost_status") == 0)
1053                 command = BQ2415X_BOOST_STATUS;
1054         else if (strcmp(attr->attr.name, "fault_status") == 0)
1055                 command = BQ2415X_FAULT_STATUS;
1056         else
1057                 return -EINVAL;
1058
1059         ret = bq2415x_exec_command(bq, command);
1060         if (ret < 0)
1061                 return ret;
1062         return sprintf(buf, "%d\n", ret);
1063 }
1064
1065 /*
1066  * set timer entry:
1067  *    auto - enable auto mode
1068  *    off - disable auto mode
1069  *    (other values) - reset chip timer
1070  */
1071 static ssize_t bq2415x_sysfs_set_timer(struct device *dev,
1072                                        struct device_attribute *attr,
1073                                        const char *buf,
1074                                        size_t count)
1075 {
1076         struct power_supply *psy = dev_get_drvdata(dev);
1077         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1078         int ret = 0;
1079
1080         if (strncmp(buf, "auto", 4) == 0)
1081                 bq2415x_set_autotimer(bq, 1);
1082         else if (strncmp(buf, "off", 3) == 0)
1083                 bq2415x_set_autotimer(bq, 0);
1084         else
1085                 ret = bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
1086
1087         if (ret < 0)
1088                 return ret;
1089         return count;
1090 }
1091
1092 /* show timer entry (auto or off) */
1093 static ssize_t bq2415x_sysfs_show_timer(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
1100         if (bq->timer_error)
1101                 return sprintf(buf, "%s\n", bq->timer_error);
1102
1103         if (bq->autotimer)
1104                 return sprintf(buf, "auto\n");
1105         return sprintf(buf, "off\n");
1106 }
1107
1108 /*
1109  * set mode entry:
1110  *    auto - if automode is supported, enable it and set mode to reported
1111  *    none - disable charger and boost mode
1112  *    host - charging mode for host/hub chargers (current limit 500mA)
1113  *    dedicated - charging mode for dedicated chargers (unlimited current limit)
1114  *    boost - disable charger and enable boost mode
1115  */
1116 static ssize_t bq2415x_sysfs_set_mode(struct device *dev,
1117                                       struct device_attribute *attr,
1118                                       const char *buf,
1119                                       size_t count)
1120 {
1121         struct power_supply *psy = dev_get_drvdata(dev);
1122         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1123         enum bq2415x_mode mode;
1124         int ret = 0;
1125
1126         if (strncmp(buf, "auto", 4) == 0) {
1127                 if (bq->automode < 0)
1128                         return -EINVAL;
1129                 bq->automode = 1;
1130                 mode = bq->reported_mode;
1131         } else if (strncmp(buf, "off", 3) == 0) {
1132                 if (bq->automode > 0)
1133                         bq->automode = 0;
1134                 mode = BQ2415X_MODE_OFF;
1135         } else if (strncmp(buf, "none", 4) == 0) {
1136                 if (bq->automode > 0)
1137                         bq->automode = 0;
1138                 mode = BQ2415X_MODE_NONE;
1139         } else if (strncmp(buf, "host", 4) == 0) {
1140                 if (bq->automode > 0)
1141                         bq->automode = 0;
1142                 mode = BQ2415X_MODE_HOST_CHARGER;
1143         } else if (strncmp(buf, "dedicated", 9) == 0) {
1144                 if (bq->automode > 0)
1145                         bq->automode = 0;
1146                 mode = BQ2415X_MODE_DEDICATED_CHARGER;
1147         } else if (strncmp(buf, "boost", 5) == 0) {
1148                 if (bq->automode > 0)
1149                         bq->automode = 0;
1150                 mode = BQ2415X_MODE_BOOST;
1151         } else if (strncmp(buf, "reset", 5) == 0) {
1152                 bq2415x_reset_chip(bq);
1153                 bq2415x_set_defaults(bq);
1154                 if (bq->automode <= 0)
1155                         return count;
1156                 bq->automode = 1;
1157                 mode = bq->reported_mode;
1158         } else {
1159                 return -EINVAL;
1160         }
1161
1162         ret = bq2415x_set_mode(bq, mode);
1163         if (ret < 0)
1164                 return ret;
1165         return count;
1166 }
1167
1168 /* show mode entry (auto, none, host, dedicated or boost) */
1169 static ssize_t bq2415x_sysfs_show_mode(struct device *dev,
1170                                        struct device_attribute *attr,
1171                                        char *buf)
1172 {
1173         struct power_supply *psy = dev_get_drvdata(dev);
1174         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1175         ssize_t ret = 0;
1176
1177         if (bq->automode > 0)
1178                 ret += sprintf(buf+ret, "auto (");
1179
1180         switch (bq->mode) {
1181         case BQ2415X_MODE_OFF:
1182                 ret += sprintf(buf+ret, "off");
1183                 break;
1184         case BQ2415X_MODE_NONE:
1185                 ret += sprintf(buf+ret, "none");
1186                 break;
1187         case BQ2415X_MODE_HOST_CHARGER:
1188                 ret += sprintf(buf+ret, "host");
1189                 break;
1190         case BQ2415X_MODE_DEDICATED_CHARGER:
1191                 ret += sprintf(buf+ret, "dedicated");
1192                 break;
1193         case BQ2415X_MODE_BOOST:
1194                 ret += sprintf(buf+ret, "boost");
1195                 break;
1196         }
1197
1198         if (bq->automode > 0)
1199                 ret += sprintf(buf+ret, ")");
1200
1201         ret += sprintf(buf+ret, "\n");
1202         return ret;
1203 }
1204
1205 /* show reported_mode entry (none, host, dedicated or boost) */
1206 static ssize_t bq2415x_sysfs_show_reported_mode(struct device *dev,
1207                                                 struct device_attribute *attr,
1208                                                 char *buf)
1209 {
1210         struct power_supply *psy = dev_get_drvdata(dev);
1211         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1212
1213         if (bq->automode < 0)
1214                 return -EINVAL;
1215
1216         switch (bq->reported_mode) {
1217         case BQ2415X_MODE_OFF:
1218                 return sprintf(buf, "off\n");
1219         case BQ2415X_MODE_NONE:
1220                 return sprintf(buf, "none\n");
1221         case BQ2415X_MODE_HOST_CHARGER:
1222                 return sprintf(buf, "host\n");
1223         case BQ2415X_MODE_DEDICATED_CHARGER:
1224                 return sprintf(buf, "dedicated\n");
1225         case BQ2415X_MODE_BOOST:
1226                 return sprintf(buf, "boost\n");
1227         }
1228
1229         return -EINVAL;
1230 }
1231
1232 /* directly set raw value to chip register, format: 'register value' */
1233 static ssize_t bq2415x_sysfs_set_registers(struct device *dev,
1234                                            struct device_attribute *attr,
1235                                            const char *buf,
1236                                            size_t count)
1237 {
1238         struct power_supply *psy = dev_get_drvdata(dev);
1239         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1240         ssize_t ret = 0;
1241         unsigned int reg;
1242         unsigned int val;
1243
1244         if (sscanf(buf, "%x %x", &reg, &val) != 2)
1245                 return -EINVAL;
1246
1247         if (reg > 4 || val > 255)
1248                 return -EINVAL;
1249
1250         ret = bq2415x_i2c_write(bq, reg, val);
1251         if (ret < 0)
1252                 return ret;
1253         return count;
1254 }
1255
1256 /* print value of chip register, format: 'register=value' */
1257 static ssize_t bq2415x_sysfs_print_reg(struct bq2415x_device *bq,
1258                                        u8 reg,
1259                                        char *buf)
1260 {
1261         int ret = bq2415x_i2c_read(bq, reg);
1262
1263         if (ret < 0)
1264                 return sprintf(buf, "%#.2x=error %d\n", reg, ret);
1265         return sprintf(buf, "%#.2x=%#.2x\n", reg, ret);
1266 }
1267
1268 /* show all raw values of chip register, format per line: 'register=value' */
1269 static ssize_t bq2415x_sysfs_show_registers(struct device *dev,
1270                                             struct device_attribute *attr,
1271                                             char *buf)
1272 {
1273         struct power_supply *psy = dev_get_drvdata(dev);
1274         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1275         ssize_t ret = 0;
1276
1277         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_STATUS, buf+ret);
1278         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CONTROL, buf+ret);
1279         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VOLTAGE, buf+ret);
1280         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VENDER, buf+ret);
1281         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CURRENT, buf+ret);
1282         return ret;
1283 }
1284
1285 /* set current and voltage limit entries (in mA or mV) */
1286 static ssize_t bq2415x_sysfs_set_limit(struct device *dev,
1287                                        struct device_attribute *attr,
1288                                        const char *buf,
1289                                        size_t count)
1290 {
1291         struct power_supply *psy = dev_get_drvdata(dev);
1292         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1293         long val;
1294         int ret;
1295
1296         if (kstrtol(buf, 10, &val) < 0)
1297                 return -EINVAL;
1298
1299         if (strcmp(attr->attr.name, "current_limit") == 0)
1300                 ret = bq2415x_set_current_limit(bq, val);
1301         else if (strcmp(attr->attr.name, "weak_battery_voltage") == 0)
1302                 ret = bq2415x_set_weak_battery_voltage(bq, val);
1303         else if (strcmp(attr->attr.name, "battery_regulation_voltage") == 0)
1304                 ret = bq2415x_set_battery_regulation_voltage(bq, val);
1305         else if (strcmp(attr->attr.name, "charge_current") == 0)
1306                 ret = bq2415x_set_charge_current(bq, val);
1307         else if (strcmp(attr->attr.name, "termination_current") == 0)
1308                 ret = bq2415x_set_termination_current(bq, val);
1309         else
1310                 return -EINVAL;
1311
1312         if (ret < 0)
1313                 return ret;
1314         return count;
1315 }
1316
1317 /* show current and voltage limit entries (in mA or mV) */
1318 static ssize_t bq2415x_sysfs_show_limit(struct device *dev,
1319                                         struct device_attribute *attr,
1320                                         char *buf)
1321 {
1322         struct power_supply *psy = dev_get_drvdata(dev);
1323         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1324         int ret;
1325
1326         if (strcmp(attr->attr.name, "current_limit") == 0)
1327                 ret = bq2415x_get_current_limit(bq);
1328         else if (strcmp(attr->attr.name, "weak_battery_voltage") == 0)
1329                 ret = bq2415x_get_weak_battery_voltage(bq);
1330         else if (strcmp(attr->attr.name, "battery_regulation_voltage") == 0)
1331                 ret = bq2415x_get_battery_regulation_voltage(bq);
1332         else if (strcmp(attr->attr.name, "charge_current") == 0)
1333                 ret = bq2415x_get_charge_current(bq);
1334         else if (strcmp(attr->attr.name, "termination_current") == 0)
1335                 ret = bq2415x_get_termination_current(bq);
1336         else
1337                 return -EINVAL;
1338
1339         if (ret < 0)
1340                 return ret;
1341         return sprintf(buf, "%d\n", ret);
1342 }
1343
1344 /* set *_enable entries */
1345 static ssize_t bq2415x_sysfs_set_enable(struct device *dev,
1346                                         struct device_attribute *attr,
1347                                         const char *buf,
1348                                         size_t count)
1349 {
1350         struct power_supply *psy = dev_get_drvdata(dev);
1351         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1352         enum bq2415x_command command;
1353         long val;
1354         int ret;
1355
1356         if (kstrtol(buf, 10, &val) < 0)
1357                 return -EINVAL;
1358
1359         if (strcmp(attr->attr.name, "charge_termination_enable") == 0)
1360                 command = val ? BQ2415X_CHARGE_TERMINATION_ENABLE :
1361                         BQ2415X_CHARGE_TERMINATION_DISABLE;
1362         else if (strcmp(attr->attr.name, "high_impedance_enable") == 0)
1363                 command = val ? BQ2415X_HIGH_IMPEDANCE_ENABLE :
1364                         BQ2415X_HIGH_IMPEDANCE_DISABLE;
1365         else if (strcmp(attr->attr.name, "otg_pin_enable") == 0)
1366                 command = val ? BQ2415X_OTG_PIN_ENABLE :
1367                         BQ2415X_OTG_PIN_DISABLE;
1368         else if (strcmp(attr->attr.name, "stat_pin_enable") == 0)
1369                 command = val ? BQ2415X_STAT_PIN_ENABLE :
1370                         BQ2415X_STAT_PIN_DISABLE;
1371         else
1372                 return -EINVAL;
1373
1374         ret = bq2415x_exec_command(bq, command);
1375         if (ret < 0)
1376                 return ret;
1377         return count;
1378 }
1379
1380 /* show *_enable entries */
1381 static ssize_t bq2415x_sysfs_show_enable(struct device *dev,
1382                                          struct device_attribute *attr,
1383                                          char *buf)
1384 {
1385         struct power_supply *psy = dev_get_drvdata(dev);
1386         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1387         enum bq2415x_command command;
1388         int ret;
1389
1390         if (strcmp(attr->attr.name, "charge_termination_enable") == 0)
1391                 command = BQ2415X_CHARGE_TERMINATION_STATUS;
1392         else if (strcmp(attr->attr.name, "high_impedance_enable") == 0)
1393                 command = BQ2415X_HIGH_IMPEDANCE_STATUS;
1394         else if (strcmp(attr->attr.name, "otg_pin_enable") == 0)
1395                 command = BQ2415X_OTG_PIN_STATUS;
1396         else if (strcmp(attr->attr.name, "stat_pin_enable") == 0)
1397                 command = BQ2415X_STAT_PIN_STATUS;
1398         else
1399                 return -EINVAL;
1400
1401         ret = bq2415x_exec_command(bq, command);
1402         if (ret < 0)
1403                 return ret;
1404         return sprintf(buf, "%d\n", ret);
1405 }
1406
1407 static DEVICE_ATTR(current_limit, S_IWUSR | S_IRUGO,
1408                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1409 static DEVICE_ATTR(weak_battery_voltage, S_IWUSR | S_IRUGO,
1410                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1411 static DEVICE_ATTR(battery_regulation_voltage, S_IWUSR | S_IRUGO,
1412                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1413 static DEVICE_ATTR(charge_current, S_IWUSR | S_IRUGO,
1414                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1415 static DEVICE_ATTR(termination_current, S_IWUSR | S_IRUGO,
1416                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1417
1418 static DEVICE_ATTR(charge_termination_enable, S_IWUSR | S_IRUGO,
1419                 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1420 static DEVICE_ATTR(high_impedance_enable, S_IWUSR | S_IRUGO,
1421                 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1422 static DEVICE_ATTR(otg_pin_enable, S_IWUSR | S_IRUGO,
1423                 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1424 static DEVICE_ATTR(stat_pin_enable, S_IWUSR | S_IRUGO,
1425                 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1426
1427 static DEVICE_ATTR(reported_mode, S_IRUGO,
1428                 bq2415x_sysfs_show_reported_mode, NULL);
1429 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO,
1430                 bq2415x_sysfs_show_mode, bq2415x_sysfs_set_mode);
1431 static DEVICE_ATTR(timer, S_IWUSR | S_IRUGO,
1432                 bq2415x_sysfs_show_timer, bq2415x_sysfs_set_timer);
1433
1434 static DEVICE_ATTR(registers, S_IWUSR | S_IRUGO,
1435                 bq2415x_sysfs_show_registers, bq2415x_sysfs_set_registers);
1436
1437 static DEVICE_ATTR(otg_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1438 static DEVICE_ATTR(charge_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1439 static DEVICE_ATTR(boost_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1440 static DEVICE_ATTR(fault_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1441
1442 static struct attribute *bq2415x_sysfs_attrs[] = {
1443         /*
1444          * TODO: some (appropriate) of these attrs should be switched to
1445          * use power supply class props.
1446          */
1447         &dev_attr_current_limit.attr,
1448         &dev_attr_weak_battery_voltage.attr,
1449         &dev_attr_battery_regulation_voltage.attr,
1450         &dev_attr_charge_current.attr,
1451         &dev_attr_termination_current.attr,
1452
1453         &dev_attr_charge_termination_enable.attr,
1454         &dev_attr_high_impedance_enable.attr,
1455         &dev_attr_otg_pin_enable.attr,
1456         &dev_attr_stat_pin_enable.attr,
1457
1458         &dev_attr_reported_mode.attr,
1459         &dev_attr_mode.attr,
1460         &dev_attr_timer.attr,
1461
1462         &dev_attr_registers.attr,
1463
1464         &dev_attr_otg_status.attr,
1465         &dev_attr_charge_status.attr,
1466         &dev_attr_boost_status.attr,
1467         &dev_attr_fault_status.attr,
1468         NULL,
1469 };
1470
1471 ATTRIBUTE_GROUPS(bq2415x_sysfs);
1472
1473 static int bq2415x_power_supply_init(struct bq2415x_device *bq)
1474 {
1475         int ret;
1476         int chip;
1477         char revstr[8];
1478         struct power_supply_config psy_cfg = {
1479                 .drv_data = bq,
1480                 .of_node = bq->dev->of_node,
1481                 .attr_grp = bq2415x_sysfs_groups,
1482         };
1483
1484         bq->charger_desc.name = bq->name;
1485         bq->charger_desc.type = POWER_SUPPLY_TYPE_USB;
1486         bq->charger_desc.properties = bq2415x_power_supply_props;
1487         bq->charger_desc.num_properties =
1488                         ARRAY_SIZE(bq2415x_power_supply_props);
1489         bq->charger_desc.get_property = bq2415x_power_supply_get_property;
1490
1491         ret = bq2415x_detect_chip(bq);
1492         if (ret < 0)
1493                 chip = BQUNKNOWN;
1494         else
1495                 chip = ret;
1496
1497         ret = bq2415x_detect_revision(bq);
1498         if (ret < 0)
1499                 strcpy(revstr, "unknown");
1500         else
1501                 sprintf(revstr, "1.%d", ret);
1502
1503         bq->model = kasprintf(GFP_KERNEL,
1504                                 "chip %s, revision %s, vender code %.3d",
1505                                 bq2415x_chip_name[chip], revstr,
1506                                 bq2415x_get_vender_code(bq));
1507         if (!bq->model) {
1508                 dev_err(bq->dev, "failed to allocate model name\n");
1509                 return -ENOMEM;
1510         }
1511
1512         bq->charger = power_supply_register(bq->dev, &bq->charger_desc,
1513                                             &psy_cfg);
1514         if (IS_ERR(bq->charger)) {
1515                 kfree(bq->model);
1516                 return PTR_ERR(bq->charger);
1517         }
1518
1519         return 0;
1520 }
1521
1522 /* main bq2415x probe function */
1523 static int bq2415x_probe(struct i2c_client *client,
1524                          const struct i2c_device_id *id)
1525 {
1526         int ret;
1527         int num;
1528         char *name = NULL;
1529         struct bq2415x_device *bq;
1530         struct device_node *np = client->dev.of_node;
1531         struct bq2415x_platform_data *pdata = client->dev.platform_data;
1532         const struct acpi_device_id *acpi_id = NULL;
1533         struct power_supply *notify_psy = NULL;
1534         union power_supply_propval prop;
1535
1536         if (!np && !pdata && !ACPI_HANDLE(&client->dev)) {
1537                 dev_err(&client->dev, "Neither devicetree, nor platform data, nor ACPI support\n");
1538                 return -ENODEV;
1539         }
1540
1541         /* Get new ID for the new device */
1542         mutex_lock(&bq2415x_id_mutex);
1543         num = idr_alloc(&bq2415x_id, client, 0, 0, GFP_KERNEL);
1544         mutex_unlock(&bq2415x_id_mutex);
1545         if (num < 0)
1546                 return num;
1547
1548         if (id) {
1549                 name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
1550         } else if (ACPI_HANDLE(&client->dev)) {
1551                 acpi_id =
1552                         acpi_match_device(client->dev.driver->acpi_match_table,
1553                                           &client->dev);
1554                 if (!acpi_id) {
1555                         dev_err(&client->dev, "failed to match device name\n");
1556                         ret = -ENODEV;
1557                         goto error_1;
1558                 }
1559                 name = kasprintf(GFP_KERNEL, "%s-%d", acpi_id->id, num);
1560         }
1561         if (!name) {
1562                 dev_err(&client->dev, "failed to allocate device name\n");
1563                 ret = -ENOMEM;
1564                 goto error_1;
1565         }
1566
1567         bq = devm_kzalloc(&client->dev, sizeof(*bq), GFP_KERNEL);
1568         if (!bq) {
1569                 ret = -ENOMEM;
1570                 goto error_2;
1571         }
1572
1573         i2c_set_clientdata(client, bq);
1574
1575         bq->id = num;
1576         bq->dev = &client->dev;
1577         if (id)
1578                 bq->chip = id->driver_data;
1579         else if (ACPI_HANDLE(bq->dev))
1580                 bq->chip = acpi_id->driver_data;
1581         bq->name = name;
1582         bq->mode = BQ2415X_MODE_OFF;
1583         bq->reported_mode = BQ2415X_MODE_OFF;
1584         bq->autotimer = 0;
1585         bq->automode = 0;
1586
1587         if (np || ACPI_HANDLE(bq->dev)) {
1588                 ret = device_property_read_u32(bq->dev,
1589                                                "ti,current-limit",
1590                                                &bq->init_data.current_limit);
1591                 if (ret)
1592                         goto error_2;
1593                 ret = device_property_read_u32(bq->dev,
1594                                         "ti,weak-battery-voltage",
1595                                         &bq->init_data.weak_battery_voltage);
1596                 if (ret)
1597                         goto error_2;
1598                 ret = device_property_read_u32(bq->dev,
1599                                 "ti,battery-regulation-voltage",
1600                                 &bq->init_data.battery_regulation_voltage);
1601                 if (ret)
1602                         goto error_2;
1603                 ret = device_property_read_u32(bq->dev,
1604                                                "ti,charge-current",
1605                                                &bq->init_data.charge_current);
1606                 if (ret)
1607                         goto error_2;
1608                 ret = device_property_read_u32(bq->dev,
1609                                 "ti,termination-current",
1610                                 &bq->init_data.termination_current);
1611                 if (ret)
1612                         goto error_2;
1613                 ret = device_property_read_u32(bq->dev,
1614                                                "ti,resistor-sense",
1615                                                &bq->init_data.resistor_sense);
1616                 if (ret)
1617                         goto error_2;
1618                 if (np)
1619                         bq->notify_node = of_parse_phandle(np,
1620                                                 "ti,usb-charger-detection", 0);
1621         } else {
1622                 memcpy(&bq->init_data, pdata, sizeof(bq->init_data));
1623         }
1624
1625         bq2415x_reset_chip(bq);
1626
1627         ret = bq2415x_power_supply_init(bq);
1628         if (ret) {
1629                 dev_err(bq->dev, "failed to register power supply: %d\n", ret);
1630                 goto error_2;
1631         }
1632
1633         ret = bq2415x_set_defaults(bq);
1634         if (ret) {
1635                 dev_err(bq->dev, "failed to set default values: %d\n", ret);
1636                 goto error_3;
1637         }
1638
1639         if (bq->notify_node || bq->init_data.notify_device) {
1640                 bq->nb.notifier_call = bq2415x_notifier_call;
1641                 ret = power_supply_reg_notifier(&bq->nb);
1642                 if (ret) {
1643                         dev_err(bq->dev, "failed to reg notifier: %d\n", ret);
1644                         goto error_3;
1645                 }
1646
1647                 bq->automode = 1;
1648                 dev_info(bq->dev, "automode supported, waiting for events\n");
1649         } else {
1650                 bq->automode = -1;
1651                 dev_info(bq->dev, "automode not supported\n");
1652         }
1653
1654         /* Query for initial reported_mode and set it */
1655         if (bq->nb.notifier_call) {
1656                 if (np) {
1657                         notify_psy = power_supply_get_by_phandle(np,
1658                                                 "ti,usb-charger-detection");
1659                         if (IS_ERR(notify_psy))
1660                                 notify_psy = NULL;
1661                 } else if (bq->init_data.notify_device) {
1662                         notify_psy = power_supply_get_by_name(
1663                                                 bq->init_data.notify_device);
1664                 }
1665         }
1666         if (notify_psy) {
1667                 ret = power_supply_get_property(notify_psy,
1668                                         POWER_SUPPLY_PROP_CURRENT_MAX, &prop);
1669                 power_supply_put(notify_psy);
1670
1671                 if (ret == 0) {
1672                         bq2415x_update_reported_mode(bq, prop.intval);
1673                         bq2415x_set_mode(bq, bq->reported_mode);
1674                 }
1675         }
1676
1677         INIT_DELAYED_WORK(&bq->work, bq2415x_timer_work);
1678         bq2415x_set_autotimer(bq, 1);
1679
1680         dev_info(bq->dev, "driver registered\n");
1681         return 0;
1682
1683 error_3:
1684         bq2415x_power_supply_exit(bq);
1685 error_2:
1686         if (bq)
1687                 of_node_put(bq->notify_node);
1688         kfree(name);
1689 error_1:
1690         mutex_lock(&bq2415x_id_mutex);
1691         idr_remove(&bq2415x_id, num);
1692         mutex_unlock(&bq2415x_id_mutex);
1693
1694         return ret;
1695 }
1696
1697 /* main bq2415x remove function */
1698
1699 static int bq2415x_remove(struct i2c_client *client)
1700 {
1701         struct bq2415x_device *bq = i2c_get_clientdata(client);
1702
1703         if (bq->nb.notifier_call)
1704                 power_supply_unreg_notifier(&bq->nb);
1705
1706         of_node_put(bq->notify_node);
1707         bq2415x_power_supply_exit(bq);
1708
1709         bq2415x_reset_chip(bq);
1710
1711         mutex_lock(&bq2415x_id_mutex);
1712         idr_remove(&bq2415x_id, bq->id);
1713         mutex_unlock(&bq2415x_id_mutex);
1714
1715         dev_info(bq->dev, "driver unregistered\n");
1716
1717         kfree(bq->name);
1718
1719         return 0;
1720 }
1721
1722 static const struct i2c_device_id bq2415x_i2c_id_table[] = {
1723         { "bq2415x", BQUNKNOWN },
1724         { "bq24150", BQ24150 },
1725         { "bq24150a", BQ24150A },
1726         { "bq24151", BQ24151 },
1727         { "bq24151a", BQ24151A },
1728         { "bq24152", BQ24152 },
1729         { "bq24153", BQ24153 },
1730         { "bq24153a", BQ24153A },
1731         { "bq24155", BQ24155 },
1732         { "bq24156", BQ24156 },
1733         { "bq24156a", BQ24156A },
1734         { "bq24157s", BQ24157S },
1735         { "bq24158", BQ24158 },
1736         {},
1737 };
1738 MODULE_DEVICE_TABLE(i2c, bq2415x_i2c_id_table);
1739
1740 #ifdef CONFIG_ACPI
1741 static const struct acpi_device_id bq2415x_i2c_acpi_match[] = {
1742         { "BQ2415X", BQUNKNOWN },
1743         { "BQ241500", BQ24150 },
1744         { "BQA24150", BQ24150A },
1745         { "BQ241510", BQ24151 },
1746         { "BQA24151", BQ24151A },
1747         { "BQ241520", BQ24152 },
1748         { "BQ241530", BQ24153 },
1749         { "BQA24153", BQ24153A },
1750         { "BQ241550", BQ24155 },
1751         { "BQ241560", BQ24156 },
1752         { "BQA24156", BQ24156A },
1753         { "BQS24157", BQ24157S },
1754         { "BQ241580", BQ24158 },
1755         {},
1756 };
1757 MODULE_DEVICE_TABLE(acpi, bq2415x_i2c_acpi_match);
1758 #endif
1759
1760 #ifdef CONFIG_OF
1761 static const struct of_device_id bq2415x_of_match_table[] = {
1762         { .compatible = "ti,bq24150" },
1763         { .compatible = "ti,bq24150a" },
1764         { .compatible = "ti,bq24151" },
1765         { .compatible = "ti,bq24151a" },
1766         { .compatible = "ti,bq24152" },
1767         { .compatible = "ti,bq24153" },
1768         { .compatible = "ti,bq24153a" },
1769         { .compatible = "ti,bq24155" },
1770         { .compatible = "ti,bq24156" },
1771         { .compatible = "ti,bq24156a" },
1772         { .compatible = "ti,bq24157s" },
1773         { .compatible = "ti,bq24158" },
1774         {},
1775 };
1776 MODULE_DEVICE_TABLE(of, bq2415x_of_match_table);
1777 #endif
1778
1779 static struct i2c_driver bq2415x_driver = {
1780         .driver = {
1781                 .name = "bq2415x-charger",
1782                 .of_match_table = of_match_ptr(bq2415x_of_match_table),
1783                 .acpi_match_table = ACPI_PTR(bq2415x_i2c_acpi_match),
1784         },
1785         .probe = bq2415x_probe,
1786         .remove = bq2415x_remove,
1787         .id_table = bq2415x_i2c_id_table,
1788 };
1789 module_i2c_driver(bq2415x_driver);
1790
1791 MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
1792 MODULE_DESCRIPTION("bq2415x charger driver");
1793 MODULE_LICENSE("GPL");