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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / drivers / power / bq2415x_charger.c
blob73e2f0b79dd4f9c67c8c4f70a5d596f46bfe4cb7
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)
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 of_node_put(bq->notify_node);
1728 bq2415x_sysfs_exit(bq);
1729 bq2415x_power_supply_exit(bq);
1730
1731 bq2415x_reset_chip(bq);
1732
1733 mutex_lock(&bq2415x_id_mutex);
1734 idr_remove(&bq2415x_id, bq->id);
1735 mutex_unlock(&bq2415x_id_mutex);
1736
1737 dev_info(bq->dev, "driver unregistered\n");
1738
1739 kfree(bq->name);
1740
1741 return 0;
1742 }
1743
1744 static const struct i2c_device_id bq2415x_i2c_id_table[] = {
1745 { "bq2415x", BQUNKNOWN },
1746 { "bq24150", BQ24150 },
1747 { "bq24150a", BQ24150A },
1748 { "bq24151", BQ24151 },
1749 { "bq24151a", BQ24151A },
1750 { "bq24152", BQ24152 },
1751 { "bq24153", BQ24153 },
1752 { "bq24153a", BQ24153A },
1753 { "bq24155", BQ24155 },
1754 { "bq24156", BQ24156 },
1755 { "bq24156a", BQ24156A },
1756 { "bq24157s", BQ24157S },
1757 { "bq24158", BQ24158 },
1758 {},
1759 };
1760 MODULE_DEVICE_TABLE(i2c, bq2415x_i2c_id_table);
1761
1762 #ifdef CONFIG_ACPI
1763 static const struct acpi_device_id bq2415x_i2c_acpi_match[] = {
1764 { "BQ2415X", BQUNKNOWN },
1765 { "BQ241500", BQ24150 },
1766 { "BQA24150", BQ24150A },
1767 { "BQ241510", BQ24151 },
1768 { "BQA24151", BQ24151A },
1769 { "BQ241520", BQ24152 },
1770 { "BQ241530", BQ24153 },
1771 { "BQA24153", BQ24153A },
1772 { "BQ241550", BQ24155 },
1773 { "BQ241560", BQ24156 },
1774 { "BQA24156", BQ24156A },
1775 { "BQS24157", BQ24157S },
1776 { "BQ241580", BQ24158 },
1777 {},
1778 };
1779 MODULE_DEVICE_TABLE(acpi, bq2415x_i2c_acpi_match);
1780 #endif
1781
1782 #ifdef CONFIG_OF
1783 static const struct of_device_id bq2415x_of_match_table[] = {
1784 { .compatible = "ti,bq24150" },
1785 { .compatible = "ti,bq24150a" },
1786 { .compatible = "ti,bq24151" },
1787 { .compatible = "ti,bq24151a" },
1788 { .compatible = "ti,bq24152" },
1789 { .compatible = "ti,bq24153" },
1790 { .compatible = "ti,bq24153a" },
1791 { .compatible = "ti,bq24155" },
1792 { .compatible = "ti,bq24156" },
1793 { .compatible = "ti,bq24156a" },
1794 { .compatible = "ti,bq24157s" },
1795 { .compatible = "ti,bq24158" },
1796 {},
1797 };
1798 MODULE_DEVICE_TABLE(of, bq2415x_of_match_table);
1799 #endif
1800
1801 static struct i2c_driver bq2415x_driver = {
1802 .driver = {
1803 .name = "bq2415x-charger",
1804 .of_match_table = of_match_ptr(bq2415x_of_match_table),
1805 .acpi_match_table = ACPI_PTR(bq2415x_i2c_acpi_match),
1806 },
1807 .probe = bq2415x_probe,
1808 .remove = bq2415x_remove,
1809 .id_table = bq2415x_i2c_id_table,
1810 };
1811 module_i2c_driver(bq2415x_driver);
1812
1813 MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
1814 MODULE_DESCRIPTION("bq2415x charger driver");
1815 MODULE_LICENSE("GPL");
Linux with added FPC-III support