1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * bq2415x charger driver
4 *
5 * Copyright (C) 2011-2013 Pali Rohár <pali@kernel.org>
6 *
7 * Datasheets:
8 * https://www.ti.com/product/bq24150
9 * https://www.ti.com/product/bq24150a
10 * https://www.ti.com/product/bq24152
11 * https://www.ti.com/product/bq24153
12 * https://www.ti.com/product/bq24153a
13 * https://www.ti.com/product/bq24155
14 * https://www.ti.com/product/bq24157s
15 * https://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
91enum 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
126enum 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
142static 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
158struct 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 */
178static DEFINE_IDR(bq2415x_id);
179
180static DEFINE_MUTEX(bq2415x_id_mutex);
181static DEFINE_MUTEX(bq2415x_timer_mutex);
182static DEFINE_MUTEX(bq2415x_i2c_mutex);
183
184/**** i2c read functions ****/
185
186/* read value from register */
187static 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(adap: client->adapter, msgs: msg, ARRAY_SIZE(msg));
208 mutex_unlock(lock: &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 */
217static 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 */
232static 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), shift: bit);
237}
238
239/**** i2c write functions ****/
240
241/* write value to register */
242static 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(adap: client->adapter, msgs: msg, ARRAY_SIZE(msg));
259 mutex_unlock(lock: &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 */
271static 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, val: ret);
287}
288
289/* change only one bit in register */
290static 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), shift: bit);
296}
297
298/**** global functions ****/
299
300/* exec command function */
301static 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 val: 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, val: 1,
318 BQ2415X_BIT_EN_STAT);
319 case BQ2415X_STAT_PIN_DISABLE:
320 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS, val: 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 val: 1, BQ2415X_BIT_TE);
338 case BQ2415X_CHARGE_TERMINATION_DISABLE:
339 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
340 val: 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 val: 0, BQ2415X_BIT_CE);
350 case BQ2415X_CHARGER_DISABLE:
351 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
352 val: 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 val: 1, BQ2415X_BIT_HZ_MODE);
359 case BQ2415X_HIGH_IMPEDANCE_DISABLE:
360 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
361 val: 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 val: 1, BQ2415X_BIT_OPA_MODE);
368 case BQ2415X_BOOST_MODE_DISABLE:
369 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
370 val: 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 val: 1, BQ2415X_BIT_OTG_PL);
378 case BQ2415X_OTG_ACTIVATE_LOW:
379 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
380 val: 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 val: 1, BQ2415X_BIT_OTG_EN);
387 case BQ2415X_OTG_PIN_DISABLE:
388 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
389 val: 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 */
405static 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, command: 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 */
455static int bq2415x_detect_revision(struct bq2415x_device *bq)
456{
457 int ret = bq2415x_exec_command(bq, command: 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 */
495static int bq2415x_get_vender_code(struct bq2415x_device *bq)
496{
497 int ret;
498
499 ret = bq2415x_exec_command(bq, command: 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 */
510static 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 */
522static 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 */
540static 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 */
560static 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 */
579static 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 */
591static 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 */
610static 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) */
621static 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) */
640static 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) */
655static 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) */
674static 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 */
699static int bq2415x_set_defaults(struct bq2415x_device *bq)
700{
701 bq2415x_exec_command(bq, command: BQ2415X_BOOST_MODE_DISABLE);
702 bq2415x_exec_command(bq, command: BQ2415X_CHARGER_DISABLE);
703 bq2415x_exec_command(bq, command: 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, command: BQ2415X_CHARGE_TERMINATION_ENABLE);
713 }
714
715 bq2415x_exec_command(bq, command: BQ2415X_CHARGER_ENABLE);
716 return 0;
717}
718
719/**** charger mode functions ****/
720
721/* set charger mode */
722static 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, command: BQ2415X_CHARGER_DISABLE);
735
736 if (!boost)
737 ret = bq2415x_exec_command(bq, command: 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, mA: 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, mA: 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, mA: 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, mA: 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, mA: 100);
762 break;
763 }
764
765 if (ret < 0)
766 return ret;
767
768 if (charger)
769 ret = bq2415x_exec_command(bq, command: BQ2415X_CHARGER_ENABLE);
770 else if (boost)
771 ret = bq2415x_exec_command(bq, command: 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(kobj: &bq->charger->dev.kobj, NULL, attr: "mode");
781
782 return 0;
783
784}
785
786static 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
806static 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, psp: POWER_SUPPLY_PROP_CURRENT_MAX,
831 val: &prop);
832 if (ret != 0)
833 return NOTIFY_OK;
834
835 if (!bq2415x_update_reported_mode(bq, mA: 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(dwork: &bq->work, delay: 0);
843
844 return NOTIFY_OK;
845}
846
847/**** timer functions ****/
848
849/* enable/disable auto resetting chip timer */
850static 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(lock: &bq2415x_timer_mutex);
856 return;
857 }
858
859 bq->autotimer = state;
860
861 if (state) {
862 schedule_delayed_work(dwork: &bq->work, BQ2415X_TIMER_TIMEOUT * HZ);
863 bq2415x_exec_command(bq, command: BQ2415X_TIMER_RESET);
864 bq->timer_error = NULL;
865 } else {
866 cancel_delayed_work_sync(dwork: &bq->work);
867 }
868
869 mutex_unlock(lock: &bq2415x_timer_mutex);
870}
871
872/* called by bq2415x_timer_work on timer error */
873static void bq2415x_timer_error(struct bq2415x_device *bq, const char *msg)
874{
875 bq->timer_error = msg;
876 sysfs_notify(kobj: &bq->charger->dev.kobj, NULL, attr: "timer");
877 dev_err(bq->dev, "%s\n", msg);
878 if (bq->automode > 0)
879 bq->automode = 0;
880 bq2415x_set_mode(bq, mode: BQ2415X_MODE_OFF);
881 bq2415x_set_autotimer(bq, state: 0);
882}
883
884/* delayed work function for auto resetting chip timer */
885static 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(kobj: &bq->charger->dev.kobj, NULL, attr: "reported_mode");
895 bq2415x_set_mode(bq, mode: bq->reported_mode);
896 }
897
898 if (!bq->autotimer)
899 return;
900
901 ret = bq2415x_exec_command(bq, command: BQ2415X_TIMER_RESET);
902 if (ret < 0) {
903 bq2415x_timer_error(bq, msg: "Resetting timer failed");
904 return;
905 }
906
907 boost = bq2415x_exec_command(bq, command: BQ2415X_BOOST_MODE_STATUS);
908 if (boost < 0) {
909 bq2415x_timer_error(bq, msg: "Unknown error");
910 return;
911 }
912
913 error = bq2415x_exec_command(bq, command: BQ2415X_FAULT_STATUS);
914 if (error < 0) {
915 bq2415x_timer_error(bq, msg: "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 msg: "Overvoltage protection (chip fried)");
935 return;
936 case 2: /* Overload */
937 bq2415x_timer_error(bq, msg: "Overload");
938 return;
939 case 4: /* Battery overvoltage protection */
940 bq2415x_timer_error(bq,
941 msg: "Battery overvoltage protection");
942 return;
943 case 5: /* Thermal shutdown (too hot) */
944 bq2415x_timer_error(bq,
945 msg: "Thermal shutdown (too hot)");
946 return;
947 case 7: /* N/A */
948 bq2415x_timer_error(bq, msg: "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 msg: "Overvoltage protection (chip fried)");
973 return;
974 case 4: /* Battery overvoltage protection */
975 bq2415x_timer_error(bq,
976 msg: "Battery overvoltage protection");
977 return;
978 case 5: /* Thermal shutdown (too hot) */
979 bq2415x_timer_error(bq,
980 msg: "Thermal shutdown (too hot)");
981 return;
982 }
983 }
984
985 schedule_delayed_work(dwork: &bq->work, BQ2415X_TIMER_TIMEOUT * HZ);
986}
987
988/**** power supply interface code ****/
989
990static 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 POWER_SUPPLY_PROP_ONLINE,
995};
996
997static int bq2415x_power_supply_get_property(struct power_supply *psy,
998 enum power_supply_property psp,
999 union power_supply_propval *val)
1000{
1001 struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1002 int ret;
1003
1004 switch (psp) {
1005 case POWER_SUPPLY_PROP_STATUS:
1006 ret = bq2415x_exec_command(bq, command: BQ2415X_CHARGE_STATUS);
1007 if (ret < 0)
1008 return ret;
1009 else if (ret == 0) /* Ready */
1010 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
1011 else if (ret == 1) /* Charge in progress */
1012 val->intval = POWER_SUPPLY_STATUS_CHARGING;
1013 else if (ret == 2) /* Charge done */
1014 val->intval = POWER_SUPPLY_STATUS_FULL;
1015 else
1016 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
1017 break;
1018 case POWER_SUPPLY_PROP_MODEL_NAME:
1019 val->strval = bq->model;
1020 break;
1021 case POWER_SUPPLY_PROP_ONLINE:
1022 /* VBUS is present for all charging and fault states,
1023 * except the 'Ready' state.
1024 */
1025 ret = bq2415x_exec_command(bq, command: BQ2415X_CHARGE_STATUS);
1026 if (ret < 0)
1027 return ret;
1028 val->intval = ret > 0;
1029 break;
1030 default:
1031 return -EINVAL;
1032 }
1033 return 0;
1034}
1035
1036static void bq2415x_power_supply_exit(struct bq2415x_device *bq)
1037{
1038 bq->autotimer = 0;
1039 if (bq->automode > 0)
1040 bq->automode = 0;
1041 cancel_delayed_work_sync(dwork: &bq->work);
1042 power_supply_unregister(psy: bq->charger);
1043 kfree(objp: bq->model);
1044}
1045
1046/**** additional sysfs entries for power supply interface ****/
1047
1048/* show *_status entries */
1049static ssize_t bq2415x_sysfs_show_status(struct device *dev,
1050 struct device_attribute *attr,
1051 char *buf)
1052{
1053 struct power_supply *psy = dev_get_drvdata(dev);
1054 struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1055 enum bq2415x_command command;
1056 int ret;
1057
1058 if (strcmp(attr->attr.name, "otg_status") == 0)
1059 command = BQ2415X_OTG_STATUS;
1060 else if (strcmp(attr->attr.name, "charge_status") == 0)
1061 command = BQ2415X_CHARGE_STATUS;
1062 else if (strcmp(attr->attr.name, "boost_status") == 0)
1063 command = BQ2415X_BOOST_STATUS;
1064 else if (strcmp(attr->attr.name, "fault_status") == 0)
1065 command = BQ2415X_FAULT_STATUS;
1066 else
1067 return -EINVAL;
1068
1069 ret = bq2415x_exec_command(bq, command);
1070 if (ret < 0)
1071 return ret;
1072 return sysfs_emit(buf, fmt: "%d\n", ret);
1073}
1074
1075/*
1076 * set timer entry:
1077 * auto - enable auto mode
1078 * off - disable auto mode
1079 * (other values) - reset chip timer
1080 */
1081static ssize_t bq2415x_sysfs_set_timer(struct device *dev,
1082 struct device_attribute *attr,
1083 const char *buf,
1084 size_t count)
1085{
1086 struct power_supply *psy = dev_get_drvdata(dev);
1087 struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1088 int ret = 0;
1089
1090 if (strncmp(buf, "auto", 4) == 0)
1091 bq2415x_set_autotimer(bq, state: 1);
1092 else if (strncmp(buf, "off", 3) == 0)
1093 bq2415x_set_autotimer(bq, state: 0);
1094 else
1095 ret = bq2415x_exec_command(bq, command: BQ2415X_TIMER_RESET);
1096
1097 if (ret < 0)
1098 return ret;
1099 return count;
1100}
1101
1102/* show timer entry (auto or off) */
1103static ssize_t bq2415x_sysfs_show_timer(struct device *dev,
1104 struct device_attribute *attr,
1105 char *buf)
1106{
1107 struct power_supply *psy = dev_get_drvdata(dev);
1108 struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1109
1110 if (bq->timer_error)
1111 return sysfs_emit(buf, fmt: "%s\n", bq->timer_error);
1112
1113 if (bq->autotimer)
1114 return sysfs_emit(buf, fmt: "auto\n");
1115 return sysfs_emit(buf, fmt: "off\n");
1116}
1117
1118/*
1119 * set mode entry:
1120 * auto - if automode is supported, enable it and set mode to reported
1121 * none - disable charger and boost mode
1122 * host - charging mode for host/hub chargers (current limit 500mA)
1123 * dedicated - charging mode for dedicated chargers (unlimited current limit)
1124 * boost - disable charger and enable boost mode
1125 */
1126static ssize_t bq2415x_sysfs_set_mode(struct device *dev,
1127 struct device_attribute *attr,
1128 const char *buf,
1129 size_t count)
1130{
1131 struct power_supply *psy = dev_get_drvdata(dev);
1132 struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1133 enum bq2415x_mode mode;
1134 int ret = 0;
1135
1136 if (strncmp(buf, "auto", 4) == 0) {
1137 if (bq->automode < 0)
1138 return -EINVAL;
1139 bq->automode = 1;
1140 mode = bq->reported_mode;
1141 } else if (strncmp(buf, "off", 3) == 0) {
1142 if (bq->automode > 0)
1143 bq->automode = 0;
1144 mode = BQ2415X_MODE_OFF;
1145 } else if (strncmp(buf, "none", 4) == 0) {
1146 if (bq->automode > 0)
1147 bq->automode = 0;
1148 mode = BQ2415X_MODE_NONE;
1149 } else if (strncmp(buf, "host", 4) == 0) {
1150 if (bq->automode > 0)
1151 bq->automode = 0;
1152 mode = BQ2415X_MODE_HOST_CHARGER;
1153 } else if (strncmp(buf, "dedicated", 9) == 0) {
1154 if (bq->automode > 0)
1155 bq->automode = 0;
1156 mode = BQ2415X_MODE_DEDICATED_CHARGER;
1157 } else if (strncmp(buf, "boost", 5) == 0) {
1158 if (bq->automode > 0)
1159 bq->automode = 0;
1160 mode = BQ2415X_MODE_BOOST;
1161 } else if (strncmp(buf, "reset", 5) == 0) {
1162 bq2415x_reset_chip(bq);
1163 bq2415x_set_defaults(bq);
1164 if (bq->automode <= 0)
1165 return count;
1166 bq->automode = 1;
1167 mode = bq->reported_mode;
1168 } else {
1169 return -EINVAL;
1170 }
1171
1172 ret = bq2415x_set_mode(bq, mode);
1173 if (ret < 0)
1174 return ret;
1175 return count;
1176}
1177
1178/* show mode entry (auto, none, host, dedicated or boost) */
1179static ssize_t bq2415x_sysfs_show_mode(struct device *dev,
1180 struct device_attribute *attr,
1181 char *buf)
1182{
1183 struct power_supply *psy = dev_get_drvdata(dev);
1184 struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1185 ssize_t ret = 0;
1186
1187 if (bq->automode > 0)
1188 ret += sysfs_emit_at(buf, at: ret, fmt: "auto (");
1189
1190 switch (bq->mode) {
1191 case BQ2415X_MODE_OFF:
1192 ret += sysfs_emit_at(buf, at: ret, fmt: "off");
1193 break;
1194 case BQ2415X_MODE_NONE:
1195 ret += sysfs_emit_at(buf, at: ret, fmt: "none");
1196 break;
1197 case BQ2415X_MODE_HOST_CHARGER:
1198 ret += sysfs_emit_at(buf, at: ret, fmt: "host");
1199 break;
1200 case BQ2415X_MODE_DEDICATED_CHARGER:
1201 ret += sysfs_emit_at(buf, at: ret, fmt: "dedicated");
1202 break;
1203 case BQ2415X_MODE_BOOST:
1204 ret += sysfs_emit_at(buf, at: ret, fmt: "boost");
1205 break;
1206 }
1207
1208 if (bq->automode > 0)
1209 ret += sysfs_emit_at(buf, at: ret, fmt: ")");
1210
1211 ret += sysfs_emit_at(buf, at: ret, fmt: "\n");
1212 return ret;
1213}
1214
1215/* show reported_mode entry (none, host, dedicated or boost) */
1216static ssize_t bq2415x_sysfs_show_reported_mode(struct device *dev,
1217 struct device_attribute *attr,
1218 char *buf)
1219{
1220 struct power_supply *psy = dev_get_drvdata(dev);
1221 struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1222
1223 if (bq->automode < 0)
1224 return -EINVAL;
1225
1226 switch (bq->reported_mode) {
1227 case BQ2415X_MODE_OFF:
1228 return sysfs_emit(buf, fmt: "off\n");
1229 case BQ2415X_MODE_NONE:
1230 return sysfs_emit(buf, fmt: "none\n");
1231 case BQ2415X_MODE_HOST_CHARGER:
1232 return sysfs_emit(buf, fmt: "host\n");
1233 case BQ2415X_MODE_DEDICATED_CHARGER:
1234 return sysfs_emit(buf, fmt: "dedicated\n");
1235 case BQ2415X_MODE_BOOST:
1236 return sysfs_emit(buf, fmt: "boost\n");
1237 }
1238
1239 return -EINVAL;
1240}
1241
1242/* directly set raw value to chip register, format: 'register value' */
1243static ssize_t bq2415x_sysfs_set_registers(struct device *dev,
1244 struct device_attribute *attr,
1245 const char *buf,
1246 size_t count)
1247{
1248 struct power_supply *psy = dev_get_drvdata(dev);
1249 struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1250 ssize_t ret = 0;
1251 unsigned int reg;
1252 unsigned int val;
1253
1254 if (sscanf(buf, "%x %x", &reg, &val) != 2)
1255 return -EINVAL;
1256
1257 if (reg > 4 || val > 255)
1258 return -EINVAL;
1259
1260 ret = bq2415x_i2c_write(bq, reg, val);
1261 if (ret < 0)
1262 return ret;
1263 return count;
1264}
1265
1266/* print value of chip register, format: 'register=value' */
1267static ssize_t bq2415x_sysfs_print_reg(struct bq2415x_device *bq,
1268 u8 reg,
1269 char *buf)
1270{
1271 int ret = bq2415x_i2c_read(bq, reg);
1272
1273 if (ret < 0)
1274 return sysfs_emit(buf, fmt: "%#.2x=error %d\n", reg, ret);
1275 return sysfs_emit(buf, fmt: "%#.2x=%#.2x\n", reg, ret);
1276}
1277
1278/* show all raw values of chip register, format per line: 'register=value' */
1279static ssize_t bq2415x_sysfs_show_registers(struct device *dev,
1280 struct device_attribute *attr,
1281 char *buf)
1282{
1283 struct power_supply *psy = dev_get_drvdata(dev);
1284 struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1285 ssize_t ret = 0;
1286
1287 ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_STATUS, buf: buf+ret);
1288 ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CONTROL, buf: buf+ret);
1289 ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VOLTAGE, buf: buf+ret);
1290 ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VENDER, buf: buf+ret);
1291 ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CURRENT, buf: buf+ret);
1292 return ret;
1293}
1294
1295/* set current and voltage limit entries (in mA or mV) */
1296static ssize_t bq2415x_sysfs_set_limit(struct device *dev,
1297 struct device_attribute *attr,
1298 const char *buf,
1299 size_t count)
1300{
1301 struct power_supply *psy = dev_get_drvdata(dev);
1302 struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1303 long val;
1304 int ret;
1305
1306 if (kstrtol(s: buf, base: 10, res: &val) < 0)
1307 return -EINVAL;
1308
1309 if (strcmp(attr->attr.name, "current_limit") == 0)
1310 ret = bq2415x_set_current_limit(bq, mA: val);
1311 else if (strcmp(attr->attr.name, "weak_battery_voltage") == 0)
1312 ret = bq2415x_set_weak_battery_voltage(bq, mV: val);
1313 else if (strcmp(attr->attr.name, "battery_regulation_voltage") == 0)
1314 ret = bq2415x_set_battery_regulation_voltage(bq, mV: val);
1315 else if (strcmp(attr->attr.name, "charge_current") == 0)
1316 ret = bq2415x_set_charge_current(bq, mA: val);
1317 else if (strcmp(attr->attr.name, "termination_current") == 0)
1318 ret = bq2415x_set_termination_current(bq, mA: val);
1319 else
1320 return -EINVAL;
1321
1322 if (ret < 0)
1323 return ret;
1324 return count;
1325}
1326
1327/* show current and voltage limit entries (in mA or mV) */
1328static ssize_t bq2415x_sysfs_show_limit(struct device *dev,
1329 struct device_attribute *attr,
1330 char *buf)
1331{
1332 struct power_supply *psy = dev_get_drvdata(dev);
1333 struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1334 int ret;
1335
1336 if (strcmp(attr->attr.name, "current_limit") == 0)
1337 ret = bq2415x_get_current_limit(bq);
1338 else if (strcmp(attr->attr.name, "weak_battery_voltage") == 0)
1339 ret = bq2415x_get_weak_battery_voltage(bq);
1340 else if (strcmp(attr->attr.name, "battery_regulation_voltage") == 0)
1341 ret = bq2415x_get_battery_regulation_voltage(bq);
1342 else if (strcmp(attr->attr.name, "charge_current") == 0)
1343 ret = bq2415x_get_charge_current(bq);
1344 else if (strcmp(attr->attr.name, "termination_current") == 0)
1345 ret = bq2415x_get_termination_current(bq);
1346 else
1347 return -EINVAL;
1348
1349 if (ret < 0)
1350 return ret;
1351 return sysfs_emit(buf, fmt: "%d\n", ret);
1352}
1353
1354/* set *_enable entries */
1355static ssize_t bq2415x_sysfs_set_enable(struct device *dev,
1356 struct device_attribute *attr,
1357 const char *buf,
1358 size_t count)
1359{
1360 struct power_supply *psy = dev_get_drvdata(dev);
1361 struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1362 enum bq2415x_command command;
1363 long val;
1364 int ret;
1365
1366 if (kstrtol(s: buf, base: 10, res: &val) < 0)
1367 return -EINVAL;
1368
1369 if (strcmp(attr->attr.name, "charge_termination_enable") == 0)
1370 command = val ? BQ2415X_CHARGE_TERMINATION_ENABLE :
1371 BQ2415X_CHARGE_TERMINATION_DISABLE;
1372 else if (strcmp(attr->attr.name, "high_impedance_enable") == 0)
1373 command = val ? BQ2415X_HIGH_IMPEDANCE_ENABLE :
1374 BQ2415X_HIGH_IMPEDANCE_DISABLE;
1375 else if (strcmp(attr->attr.name, "otg_pin_enable") == 0)
1376 command = val ? BQ2415X_OTG_PIN_ENABLE :
1377 BQ2415X_OTG_PIN_DISABLE;
1378 else if (strcmp(attr->attr.name, "stat_pin_enable") == 0)
1379 command = val ? BQ2415X_STAT_PIN_ENABLE :
1380 BQ2415X_STAT_PIN_DISABLE;
1381 else
1382 return -EINVAL;
1383
1384 ret = bq2415x_exec_command(bq, command);
1385 if (ret < 0)
1386 return ret;
1387 return count;
1388}
1389
1390/* show *_enable entries */
1391static ssize_t bq2415x_sysfs_show_enable(struct device *dev,
1392 struct device_attribute *attr,
1393 char *buf)
1394{
1395 struct power_supply *psy = dev_get_drvdata(dev);
1396 struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1397 enum bq2415x_command command;
1398 int ret;
1399
1400 if (strcmp(attr->attr.name, "charge_termination_enable") == 0)
1401 command = BQ2415X_CHARGE_TERMINATION_STATUS;
1402 else if (strcmp(attr->attr.name, "high_impedance_enable") == 0)
1403 command = BQ2415X_HIGH_IMPEDANCE_STATUS;
1404 else if (strcmp(attr->attr.name, "otg_pin_enable") == 0)
1405 command = BQ2415X_OTG_PIN_STATUS;
1406 else if (strcmp(attr->attr.name, "stat_pin_enable") == 0)
1407 command = BQ2415X_STAT_PIN_STATUS;
1408 else
1409 return -EINVAL;
1410
1411 ret = bq2415x_exec_command(bq, command);
1412 if (ret < 0)
1413 return ret;
1414 return sysfs_emit(buf, fmt: "%d\n", ret);
1415}
1416
1417static DEVICE_ATTR(current_limit, S_IWUSR | S_IRUGO,
1418 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1419static DEVICE_ATTR(weak_battery_voltage, S_IWUSR | S_IRUGO,
1420 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1421static DEVICE_ATTR(battery_regulation_voltage, S_IWUSR | S_IRUGO,
1422 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1423static DEVICE_ATTR(charge_current, S_IWUSR | S_IRUGO,
1424 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1425static DEVICE_ATTR(termination_current, S_IWUSR | S_IRUGO,
1426 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1427
1428static DEVICE_ATTR(charge_termination_enable, S_IWUSR | S_IRUGO,
1429 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1430static DEVICE_ATTR(high_impedance_enable, S_IWUSR | S_IRUGO,
1431 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1432static DEVICE_ATTR(otg_pin_enable, S_IWUSR | S_IRUGO,
1433 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1434static DEVICE_ATTR(stat_pin_enable, S_IWUSR | S_IRUGO,
1435 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1436
1437static DEVICE_ATTR(reported_mode, S_IRUGO,
1438 bq2415x_sysfs_show_reported_mode, NULL);
1439static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO,
1440 bq2415x_sysfs_show_mode, bq2415x_sysfs_set_mode);
1441static DEVICE_ATTR(timer, S_IWUSR | S_IRUGO,
1442 bq2415x_sysfs_show_timer, bq2415x_sysfs_set_timer);
1443
1444static DEVICE_ATTR(registers, S_IWUSR | S_IRUGO,
1445 bq2415x_sysfs_show_registers, bq2415x_sysfs_set_registers);
1446
1447static DEVICE_ATTR(otg_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1448static DEVICE_ATTR(charge_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1449static DEVICE_ATTR(boost_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1450static DEVICE_ATTR(fault_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1451
1452static struct attribute *bq2415x_sysfs_attrs[] = {
1453 /*
1454 * TODO: some (appropriate) of these attrs should be switched to
1455 * use power supply class props.
1456 */
1457 &dev_attr_current_limit.attr,
1458 &dev_attr_weak_battery_voltage.attr,
1459 &dev_attr_battery_regulation_voltage.attr,
1460 &dev_attr_charge_current.attr,
1461 &dev_attr_termination_current.attr,
1462
1463 &dev_attr_charge_termination_enable.attr,
1464 &dev_attr_high_impedance_enable.attr,
1465 &dev_attr_otg_pin_enable.attr,
1466 &dev_attr_stat_pin_enable.attr,
1467
1468 &dev_attr_reported_mode.attr,
1469 &dev_attr_mode.attr,
1470 &dev_attr_timer.attr,
1471
1472 &dev_attr_registers.attr,
1473
1474 &dev_attr_otg_status.attr,
1475 &dev_attr_charge_status.attr,
1476 &dev_attr_boost_status.attr,
1477 &dev_attr_fault_status.attr,
1478 NULL,
1479};
1480
1481ATTRIBUTE_GROUPS(bq2415x_sysfs);
1482
1483static int bq2415x_power_supply_init(struct bq2415x_device *bq)
1484{
1485 int ret;
1486 int chip;
1487 char revstr[8];
1488 struct power_supply_config psy_cfg = {
1489 .drv_data = bq,
1490 .of_node = bq->dev->of_node,
1491 .attr_grp = bq2415x_sysfs_groups,
1492 };
1493
1494 bq->charger_desc.name = bq->name;
1495 bq->charger_desc.type = POWER_SUPPLY_TYPE_USB;
1496 bq->charger_desc.properties = bq2415x_power_supply_props;
1497 bq->charger_desc.num_properties =
1498 ARRAY_SIZE(bq2415x_power_supply_props);
1499 bq->charger_desc.get_property = bq2415x_power_supply_get_property;
1500
1501 ret = bq2415x_detect_chip(bq);
1502 if (ret < 0)
1503 chip = BQUNKNOWN;
1504 else
1505 chip = ret;
1506
1507 ret = bq2415x_detect_revision(bq);
1508 if (ret < 0)
1509 strcpy(p: revstr, q: "unknown");
1510 else
1511 sprintf(buf: revstr, fmt: "1.%d", ret);
1512
1513 bq->model = kasprintf(GFP_KERNEL,
1514 fmt: "chip %s, revision %s, vender code %.3d",
1515 bq2415x_chip_name[chip], revstr,
1516 bq2415x_get_vender_code(bq));
1517 if (!bq->model) {
1518 dev_err(bq->dev, "failed to allocate model name\n");
1519 return -ENOMEM;
1520 }
1521
1522 bq->charger = power_supply_register(parent: bq->dev, desc: &bq->charger_desc,
1523 cfg: &psy_cfg);
1524 if (IS_ERR(ptr: bq->charger)) {
1525 kfree(objp: bq->model);
1526 return PTR_ERR(ptr: bq->charger);
1527 }
1528
1529 return 0;
1530}
1531
1532/* main bq2415x probe function */
1533static int bq2415x_probe(struct i2c_client *client)
1534{
1535 const struct i2c_device_id *id = i2c_client_get_device_id(client);
1536 int ret;
1537 int num;
1538 char *name = NULL;
1539 struct bq2415x_device *bq;
1540 struct device_node *np = client->dev.of_node;
1541 struct bq2415x_platform_data *pdata = client->dev.platform_data;
1542 const struct acpi_device_id *acpi_id = NULL;
1543 struct power_supply *notify_psy = NULL;
1544 union power_supply_propval prop;
1545
1546 if (!np && !pdata && !ACPI_HANDLE(&client->dev)) {
1547 dev_err(&client->dev, "Neither devicetree, nor platform data, nor ACPI support\n");
1548 return -ENODEV;
1549 }
1550
1551 /* Get new ID for the new device */
1552 mutex_lock(&bq2415x_id_mutex);
1553 num = idr_alloc(&bq2415x_id, ptr: client, start: 0, end: 0, GFP_KERNEL);
1554 mutex_unlock(lock: &bq2415x_id_mutex);
1555 if (num < 0)
1556 return num;
1557
1558 if (id) {
1559 name = kasprintf(GFP_KERNEL, fmt: "%s-%d", id->name, num);
1560 } else if (ACPI_HANDLE(&client->dev)) {
1561 acpi_id =
1562 acpi_match_device(ids: client->dev.driver->acpi_match_table,
1563 dev: &client->dev);
1564 if (!acpi_id) {
1565 dev_err(&client->dev, "failed to match device name\n");
1566 ret = -ENODEV;
1567 goto error_1;
1568 }
1569 name = kasprintf(GFP_KERNEL, fmt: "%s-%d", acpi_id->id, num);
1570 }
1571 if (!name) {
1572 dev_err(&client->dev, "failed to allocate device name\n");
1573 ret = -ENOMEM;
1574 goto error_1;
1575 }
1576
1577 bq = devm_kzalloc(dev: &client->dev, size: sizeof(*bq), GFP_KERNEL);
1578 if (!bq) {
1579 ret = -ENOMEM;
1580 goto error_2;
1581 }
1582
1583 i2c_set_clientdata(client, data: bq);
1584
1585 bq->id = num;
1586 bq->dev = &client->dev;
1587 if (id)
1588 bq->chip = id->driver_data;
1589 else if (ACPI_HANDLE(bq->dev))
1590 bq->chip = acpi_id->driver_data;
1591 bq->name = name;
1592 bq->mode = BQ2415X_MODE_OFF;
1593 bq->reported_mode = BQ2415X_MODE_OFF;
1594 bq->autotimer = 0;
1595 bq->automode = 0;
1596
1597 if (np || ACPI_HANDLE(bq->dev)) {
1598 ret = device_property_read_u32(dev: bq->dev,
1599 propname: "ti,current-limit",
1600 val: &bq->init_data.current_limit);
1601 if (ret)
1602 goto error_2;
1603 ret = device_property_read_u32(dev: bq->dev,
1604 propname: "ti,weak-battery-voltage",
1605 val: &bq->init_data.weak_battery_voltage);
1606 if (ret)
1607 goto error_2;
1608 ret = device_property_read_u32(dev: bq->dev,
1609 propname: "ti,battery-regulation-voltage",
1610 val: &bq->init_data.battery_regulation_voltage);
1611 if (ret)
1612 goto error_2;
1613 ret = device_property_read_u32(dev: bq->dev,
1614 propname: "ti,charge-current",
1615 val: &bq->init_data.charge_current);
1616 if (ret)
1617 goto error_2;
1618 ret = device_property_read_u32(dev: bq->dev,
1619 propname: "ti,termination-current",
1620 val: &bq->init_data.termination_current);
1621 if (ret)
1622 goto error_2;
1623 ret = device_property_read_u32(dev: bq->dev,
1624 propname: "ti,resistor-sense",
1625 val: &bq->init_data.resistor_sense);
1626 if (ret)
1627 goto error_2;
1628 if (np)
1629 bq->notify_node = of_parse_phandle(np,
1630 phandle_name: "ti,usb-charger-detection", index: 0);
1631 } else {
1632 memcpy(&bq->init_data, pdata, sizeof(bq->init_data));
1633 }
1634
1635 bq2415x_reset_chip(bq);
1636
1637 ret = bq2415x_power_supply_init(bq);
1638 if (ret) {
1639 dev_err(bq->dev, "failed to register power supply: %d\n", ret);
1640 goto error_2;
1641 }
1642
1643 ret = bq2415x_set_defaults(bq);
1644 if (ret) {
1645 dev_err(bq->dev, "failed to set default values: %d\n", ret);
1646 goto error_3;
1647 }
1648
1649 if (bq->notify_node || bq->init_data.notify_device) {
1650 bq->nb.notifier_call = bq2415x_notifier_call;
1651 ret = power_supply_reg_notifier(nb: &bq->nb);
1652 if (ret) {
1653 dev_err(bq->dev, "failed to reg notifier: %d\n", ret);
1654 goto error_3;
1655 }
1656
1657 bq->automode = 1;
1658 dev_info(bq->dev, "automode supported, waiting for events\n");
1659 } else {
1660 bq->automode = -1;
1661 dev_info(bq->dev, "automode not supported\n");
1662 }
1663
1664 /* Query for initial reported_mode and set it */
1665 if (bq->nb.notifier_call) {
1666 if (np) {
1667 notify_psy = power_supply_get_by_phandle(np,
1668 property: "ti,usb-charger-detection");
1669 if (IS_ERR(ptr: notify_psy))
1670 notify_psy = NULL;
1671 } else if (bq->init_data.notify_device) {
1672 notify_psy = power_supply_get_by_name(
1673 name: bq->init_data.notify_device);
1674 }
1675 }
1676 if (notify_psy) {
1677 ret = power_supply_get_property(psy: notify_psy,
1678 psp: POWER_SUPPLY_PROP_CURRENT_MAX, val: &prop);
1679 power_supply_put(psy: notify_psy);
1680
1681 if (ret == 0) {
1682 bq2415x_update_reported_mode(bq, mA: prop.intval);
1683 bq2415x_set_mode(bq, mode: bq->reported_mode);
1684 }
1685 }
1686
1687 INIT_DELAYED_WORK(&bq->work, bq2415x_timer_work);
1688 bq2415x_set_autotimer(bq, state: 1);
1689
1690 dev_info(bq->dev, "driver registered\n");
1691 return 0;
1692
1693error_3:
1694 bq2415x_power_supply_exit(bq);
1695error_2:
1696 if (bq)
1697 of_node_put(node: bq->notify_node);
1698 kfree(objp: name);
1699error_1:
1700 mutex_lock(&bq2415x_id_mutex);
1701 idr_remove(&bq2415x_id, id: num);
1702 mutex_unlock(lock: &bq2415x_id_mutex);
1703
1704 return ret;
1705}
1706
1707/* main bq2415x remove function */
1708
1709static void bq2415x_remove(struct i2c_client *client)
1710{
1711 struct bq2415x_device *bq = i2c_get_clientdata(client);
1712
1713 if (bq->nb.notifier_call)
1714 power_supply_unreg_notifier(nb: &bq->nb);
1715
1716 of_node_put(node: bq->notify_node);
1717 bq2415x_power_supply_exit(bq);
1718
1719 bq2415x_reset_chip(bq);
1720
1721 mutex_lock(&bq2415x_id_mutex);
1722 idr_remove(&bq2415x_id, id: bq->id);
1723 mutex_unlock(lock: &bq2415x_id_mutex);
1724
1725 dev_info(bq->dev, "driver unregistered\n");
1726
1727 kfree(objp: bq->name);
1728}
1729
1730static const struct i2c_device_id bq2415x_i2c_id_table[] = {
1731 { "bq2415x", BQUNKNOWN },
1732 { "bq24150", BQ24150 },
1733 { "bq24150a", BQ24150A },
1734 { "bq24151", BQ24151 },
1735 { "bq24151a", BQ24151A },
1736 { "bq24152", BQ24152 },
1737 { "bq24153", BQ24153 },
1738 { "bq24153a", BQ24153A },
1739 { "bq24155", BQ24155 },
1740 { "bq24156", BQ24156 },
1741 { "bq24156a", BQ24156A },
1742 { "bq24157s", BQ24157S },
1743 { "bq24158", BQ24158 },
1744 {},
1745};
1746MODULE_DEVICE_TABLE(i2c, bq2415x_i2c_id_table);
1747
1748#ifdef CONFIG_ACPI
1749static const struct acpi_device_id bq2415x_i2c_acpi_match[] = {
1750 { "BQ2415X", BQUNKNOWN },
1751 { "BQ241500", BQ24150 },
1752 { "BQA24150", BQ24150A },
1753 { "BQ241510", BQ24151 },
1754 { "BQA24151", BQ24151A },
1755 { "BQ241520", BQ24152 },
1756 { "BQ241530", BQ24153 },
1757 { "BQA24153", BQ24153A },
1758 { "BQ241550", BQ24155 },
1759 { "BQ241560", BQ24156 },
1760 { "BQA24156", BQ24156A },
1761 { "BQS24157", BQ24157S },
1762 { "BQ241580", BQ24158 },
1763 {},
1764};
1765MODULE_DEVICE_TABLE(acpi, bq2415x_i2c_acpi_match);
1766#endif
1767
1768#ifdef CONFIG_OF
1769static const struct of_device_id bq2415x_of_match_table[] = {
1770 { .compatible = "ti,bq24150" },
1771 { .compatible = "ti,bq24150a" },
1772 { .compatible = "ti,bq24151" },
1773 { .compatible = "ti,bq24151a" },
1774 { .compatible = "ti,bq24152" },
1775 { .compatible = "ti,bq24153" },
1776 { .compatible = "ti,bq24153a" },
1777 { .compatible = "ti,bq24155" },
1778 { .compatible = "ti,bq24156" },
1779 { .compatible = "ti,bq24156a" },
1780 { .compatible = "ti,bq24157s" },
1781 { .compatible = "ti,bq24158" },
1782 {},
1783};
1784MODULE_DEVICE_TABLE(of, bq2415x_of_match_table);
1785#endif
1786
1787static struct i2c_driver bq2415x_driver = {
1788 .driver = {
1789 .name = "bq2415x-charger",
1790 .of_match_table = of_match_ptr(bq2415x_of_match_table),
1791 .acpi_match_table = ACPI_PTR(bq2415x_i2c_acpi_match),
1792 },
1793 .probe = bq2415x_probe,
1794 .remove = bq2415x_remove,
1795 .id_table = bq2415x_i2c_id_table,
1796};
1797module_i2c_driver(bq2415x_driver);
1798
1799MODULE_AUTHOR("Pali Rohár <pali@kernel.org>");
1800MODULE_DESCRIPTION("bq2415x charger driver");
1801MODULE_LICENSE("GPL");
1802

source code of linux/drivers/power/supply/bq2415x_charger.c