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Diffstat (limited to 'drivers/power/bq2415x_charger.c')
-rw-r--r--drivers/power/bq2415x_charger.c1644
1 files changed, 1644 insertions, 0 deletions
diff --git a/drivers/power/bq2415x_charger.c b/drivers/power/bq2415x_charger.c
new file mode 100644
index 00000000000..017b3c27f76
--- /dev/null
+++ b/drivers/power/bq2415x_charger.c
@@ -0,0 +1,1644 @@
1/*
2 bq2415x_charger.c - bq2415x charger driver
3 Copyright (C) 2011-2012 Pali Rohár <pali.rohar@gmail.com>
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18*/
19
20/*
21 Datasheets:
22 http://www.ti.com/product/bq24150
23 http://www.ti.com/product/bq24150a
24 http://www.ti.com/product/bq24152
25 http://www.ti.com/product/bq24153
26 http://www.ti.com/product/bq24153a
27 http://www.ti.com/product/bq24155
28*/
29
30#include <linux/version.h>
31#include <linux/kernel.h>
32#include <linux/module.h>
33#include <linux/param.h>
34#include <linux/err.h>
35#include <linux/workqueue.h>
36#include <linux/sysfs.h>
37#include <linux/platform_device.h>
38#include <linux/power_supply.h>
39#include <linux/idr.h>
40#include <linux/i2c.h>
41#include <linux/slab.h>
42
43#include <linux/power/bq2415x_charger.h>
44
45/* timeout for resetting chip timer */
46#define BQ2415X_TIMER_TIMEOUT 10
47
48#define BQ2415X_REG_STATUS 0x00
49#define BQ2415X_REG_CONTROL 0x01
50#define BQ2415X_REG_VOLTAGE 0x02
51#define BQ2415X_REG_VENDER 0x03
52#define BQ2415X_REG_CURRENT 0x04
53
54/* reset state for all registers */
55#define BQ2415X_RESET_STATUS BIT(6)
56#define BQ2415X_RESET_CONTROL (BIT(4)|BIT(5))
57#define BQ2415X_RESET_VOLTAGE (BIT(1)|BIT(3))
58#define BQ2415X_RESET_CURRENT (BIT(0)|BIT(3)|BIT(7))
59
60/* status register */
61#define BQ2415X_BIT_TMR_RST 7
62#define BQ2415X_BIT_OTG 7
63#define BQ2415X_BIT_EN_STAT 6
64#define BQ2415X_MASK_STAT (BIT(4)|BIT(5))
65#define BQ2415X_SHIFT_STAT 4
66#define BQ2415X_BIT_BOOST 3
67#define BQ2415X_MASK_FAULT (BIT(0)|BIT(1)|BIT(2))
68#define BQ2415X_SHIFT_FAULT 0
69
70/* control register */
71#define BQ2415X_MASK_LIMIT (BIT(6)|BIT(7))
72#define BQ2415X_SHIFT_LIMIT 6
73#define BQ2415X_MASK_VLOWV (BIT(4)|BIT(5))
74#define BQ2415X_SHIFT_VLOWV 4
75#define BQ2415X_BIT_TE 3
76#define BQ2415X_BIT_CE 2
77#define BQ2415X_BIT_HZ_MODE 1
78#define BQ2415X_BIT_OPA_MODE 0
79
80/* voltage register */
81#define BQ2415X_MASK_VO (BIT(2)|BIT(3)|BIT(4)|BIT(5)|BIT(6)|BIT(7))
82#define BQ2415X_SHIFT_VO 2
83#define BQ2415X_BIT_OTG_PL 1
84#define BQ2415X_BIT_OTG_EN 0
85
86/* vender register */
87#define BQ2415X_MASK_VENDER (BIT(5)|BIT(6)|BIT(7))
88#define BQ2415X_SHIFT_VENDER 5
89#define BQ2415X_MASK_PN (BIT(3)|BIT(4))
90#define BQ2415X_SHIFT_PN 3
91#define BQ2415X_MASK_REVISION (BIT(0)|BIT(1)|BIT(2))
92#define BQ2415X_SHIFT_REVISION 0
93
94/* current register */
95#define BQ2415X_MASK_RESET BIT(7)
96#define BQ2415X_MASK_VI_CHRG (BIT(4)|BIT(5)|BIT(6))
97#define BQ2415X_SHIFT_VI_CHRG 4
98/* N/A BIT(3) */
99#define BQ2415X_MASK_VI_TERM (BIT(0)|BIT(1)|BIT(2))
100#define BQ2415X_SHIFT_VI_TERM 0
101
102
103enum bq2415x_command {
104 BQ2415X_TIMER_RESET,
105 BQ2415X_OTG_STATUS,
106 BQ2415X_STAT_PIN_STATUS,
107 BQ2415X_STAT_PIN_ENABLE,
108 BQ2415X_STAT_PIN_DISABLE,
109 BQ2415X_CHARGE_STATUS,
110 BQ2415X_BOOST_STATUS,
111 BQ2415X_FAULT_STATUS,
112
113 BQ2415X_CHARGE_TERMINATION_STATUS,
114 BQ2415X_CHARGE_TERMINATION_ENABLE,
115 BQ2415X_CHARGE_TERMINATION_DISABLE,
116 BQ2415X_CHARGER_STATUS,
117 BQ2415X_CHARGER_ENABLE,
118 BQ2415X_CHARGER_DISABLE,
119 BQ2415X_HIGH_IMPEDANCE_STATUS,
120 BQ2415X_HIGH_IMPEDANCE_ENABLE,
121 BQ2415X_HIGH_IMPEDANCE_DISABLE,
122 BQ2415X_BOOST_MODE_STATUS,
123 BQ2415X_BOOST_MODE_ENABLE,
124 BQ2415X_BOOST_MODE_DISABLE,
125
126 BQ2415X_OTG_LEVEL,
127 BQ2415X_OTG_ACTIVATE_HIGH,
128 BQ2415X_OTG_ACTIVATE_LOW,
129 BQ2415X_OTG_PIN_STATUS,
130 BQ2415X_OTG_PIN_ENABLE,
131 BQ2415X_OTG_PIN_DISABLE,
132
133 BQ2415X_VENDER_CODE,
134 BQ2415X_PART_NUMBER,
135 BQ2415X_REVISION,
136};
137
138enum bq2415x_chip {
139 BQUNKNOWN,
140 BQ24150,
141 BQ24150A,
142 BQ24151,
143 BQ24151A,
144 BQ24152,
145 BQ24153,
146 BQ24153A,
147 BQ24155,
148 BQ24156,
149 BQ24156A,
150 BQ24158,
151};
152
153static char *bq2415x_chip_name[] = {
154 "unknown",
155 "bq24150",
156 "bq24150a",
157 "bq24151",
158 "bq24151a",
159 "bq24152",
160 "bq24153",
161 "bq24153a",
162 "bq24155",
163 "bq24156",
164 "bq24156a",
165 "bq24158",
166};
167
168struct bq2415x_device {
169 struct device *dev;
170 struct bq2415x_platform_data init_data;
171 struct power_supply charger;
172 struct delayed_work work;
173 enum bq2415x_mode reported_mode;/* mode reported by hook function */
174 enum bq2415x_mode mode; /* current configured mode */
175 enum bq2415x_chip chip;
176 const char *timer_error;
177 char *model;
178 char *name;
179 int autotimer; /* 1 - if driver automatically reset timer, 0 - not */
180 int automode; /* 1 - enabled, 0 - disabled; -1 - not supported */
181 int id;
182};
183
184/* each registered chip must have unique id */
185static DEFINE_IDR(bq2415x_id);
186
187static DEFINE_MUTEX(bq2415x_id_mutex);
188static DEFINE_MUTEX(bq2415x_timer_mutex);
189static DEFINE_MUTEX(bq2415x_i2c_mutex);
190
191/**** i2c read functions ****/
192
193/* read value from register */
194static int bq2415x_i2c_read(struct bq2415x_device *bq, u8 reg)
195{
196 struct i2c_client *client = to_i2c_client(bq->dev);
197 struct i2c_msg msg[2];
198 u8 val;
199 int ret;
200
201 if (!client->adapter)
202 return -ENODEV;
203
204 msg[0].addr = client->addr;
205 msg[0].flags = 0;
206 msg[0].buf = &reg;
207 msg[0].len = sizeof(reg);
208 msg[1].addr = client->addr;
209 msg[1].flags = I2C_M_RD;
210 msg[1].buf = &val;
211 msg[1].len = sizeof(val);
212
213 mutex_lock(&bq2415x_i2c_mutex);
214 ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
215 mutex_unlock(&bq2415x_i2c_mutex);
216
217 if (ret < 0)
218 return ret;
219
220 return val;
221}
222
223/* read value from register, apply mask and right shift it */
224static int bq2415x_i2c_read_mask(struct bq2415x_device *bq, u8 reg,
225 u8 mask, u8 shift)
226{
227 int ret;
228
229 if (shift > 8)
230 return -EINVAL;
231
232 ret = bq2415x_i2c_read(bq, reg);
233 if (ret < 0)
234 return ret;
235 else
236 return (ret & mask) >> shift;
237}
238
239/* read value from register and return one specified bit */
240static int bq2415x_i2c_read_bit(struct bq2415x_device *bq, u8 reg, u8 bit)
241{
242 if (bit > 8)
243 return -EINVAL;
244 else
245 return bq2415x_i2c_read_mask(bq, reg, BIT(bit), bit);
246}
247
248/**** i2c write functions ****/
249
250/* write value to register */
251static 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 */
280static 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 */
299static 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 else
305 return bq2415x_i2c_write_mask(bq, reg, val, BIT(bit), bit);
306}
307
308/**** global functions ****/
309
310/* exec command function */
311static int bq2415x_exec_command(struct bq2415x_device *bq,
312 enum bq2415x_command command)
313{
314 int ret;
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 else
356 return ret > 0 ? 0 : 1;
357 case BQ2415X_CHARGER_ENABLE:
358 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
359 0, BQ2415X_BIT_CE);
360 case BQ2415X_CHARGER_DISABLE:
361 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
362 1, BQ2415X_BIT_CE);
363 case BQ2415X_HIGH_IMPEDANCE_STATUS:
364 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
365 BQ2415X_BIT_HZ_MODE);
366 case BQ2415X_HIGH_IMPEDANCE_ENABLE:
367 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
368 1, BQ2415X_BIT_HZ_MODE);
369 case BQ2415X_HIGH_IMPEDANCE_DISABLE:
370 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
371 0, BQ2415X_BIT_HZ_MODE);
372 case BQ2415X_BOOST_MODE_STATUS:
373 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
374 BQ2415X_BIT_OPA_MODE);
375 case BQ2415X_BOOST_MODE_ENABLE:
376 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
377 1, BQ2415X_BIT_OPA_MODE);
378 case BQ2415X_BOOST_MODE_DISABLE:
379 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
380 0, BQ2415X_BIT_OPA_MODE);
381
382 case BQ2415X_OTG_LEVEL:
383 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_VOLTAGE,
384 BQ2415X_BIT_OTG_PL);
385 case BQ2415X_OTG_ACTIVATE_HIGH:
386 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
387 1, BQ2415X_BIT_OTG_PL);
388 case BQ2415X_OTG_ACTIVATE_LOW:
389 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
390 0, BQ2415X_BIT_OTG_PL);
391 case BQ2415X_OTG_PIN_STATUS:
392 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_VOLTAGE,
393 BQ2415X_BIT_OTG_EN);
394 case BQ2415X_OTG_PIN_ENABLE:
395 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
396 1, BQ2415X_BIT_OTG_EN);
397 case BQ2415X_OTG_PIN_DISABLE:
398 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
399 0, BQ2415X_BIT_OTG_EN);
400
401 case BQ2415X_VENDER_CODE:
402 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER,
403 BQ2415X_MASK_VENDER, BQ2415X_SHIFT_VENDER);
404 case BQ2415X_PART_NUMBER:
405 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER,
406 BQ2415X_MASK_PN, BQ2415X_SHIFT_PN);
407 case BQ2415X_REVISION:
408 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER,
409 BQ2415X_MASK_REVISION, BQ2415X_SHIFT_REVISION);
410
411 default:
412 return -EINVAL;
413 }
414}
415
416/* detect chip type */
417static enum bq2415x_chip bq2415x_detect_chip(struct bq2415x_device *bq)
418{
419 struct i2c_client *client = to_i2c_client(bq->dev);
420 int ret = bq2415x_exec_command(bq, BQ2415X_PART_NUMBER);
421
422 if (ret < 0)
423 return ret;
424
425 switch (client->addr) {
426 case 0x6b:
427 switch (ret) {
428 case 0:
429 if (bq->chip == BQ24151A)
430 return bq->chip;
431 else
432 return BQ24151;
433 case 1:
434 if (bq->chip == BQ24150A ||
435 bq->chip == BQ24152 ||
436 bq->chip == BQ24155)
437 return bq->chip;
438 else
439 return BQ24150;
440 case 2:
441 if (bq->chip == BQ24153A)
442 return bq->chip;
443 else
444 return BQ24153;
445 default:
446 return BQUNKNOWN;
447 }
448 break;
449
450 case 0x6a:
451 switch (ret) {
452 case 0:
453 if (bq->chip == BQ24156A)
454 return bq->chip;
455 else
456 return BQ24156;
457 case 2:
458 return BQ24158;
459 default:
460 return BQUNKNOWN;
461 }
462 break;
463 }
464
465 return BQUNKNOWN;
466}
467
468/* detect chip revision */
469static int bq2415x_detect_revision(struct bq2415x_device *bq)
470{
471 int ret = bq2415x_exec_command(bq, BQ2415X_REVISION);
472 int chip = bq2415x_detect_chip(bq);
473 if (ret < 0 || chip < 0)
474 return -1;
475
476 switch (chip) {
477 case BQ24150:
478 case BQ24150A:
479 case BQ24151:
480 case BQ24151A:
481 case BQ24152:
482 if (ret >= 0 && ret <= 3)
483 return ret;
484 else
485 return -1;
486
487 case BQ24153:
488 case BQ24153A:
489 case BQ24156:
490 case BQ24156A:
491 case BQ24158:
492 if (ret == 3)
493 return 0;
494 else if (ret == 1)
495 return 1;
496 else
497 return -1;
498
499 case BQ24155:
500 if (ret == 3)
501 return 3;
502 else
503 return -1;
504
505 case BQUNKNOWN:
506 return -1;
507 }
508
509 return -1;
510}
511
512/* return chip vender code */
513static int bq2415x_get_vender_code(struct bq2415x_device *bq)
514{
515 int ret = bq2415x_exec_command(bq, BQ2415X_VENDER_CODE);
516 if (ret < 0)
517 return 0;
518 else /* convert to binary */
519 return (ret & 0x1) +
520 ((ret >> 1) & 0x1) * 10 +
521 ((ret >> 2) & 0x1) * 100;
522}
523
524/* reset all chip registers to default state */
525static void bq2415x_reset_chip(struct bq2415x_device *bq)
526{
527 bq2415x_i2c_write(bq, BQ2415X_REG_CURRENT, BQ2415X_RESET_CURRENT);
528 bq2415x_i2c_write(bq, BQ2415X_REG_VOLTAGE, BQ2415X_RESET_VOLTAGE);
529 bq2415x_i2c_write(bq, BQ2415X_REG_CONTROL, BQ2415X_RESET_CONTROL);
530 bq2415x_i2c_write(bq, BQ2415X_REG_STATUS, BQ2415X_RESET_STATUS);
531 bq->timer_error = NULL;
532}
533
534/**** properties functions ****/
535
536/* set current limit in mA */
537static int bq2415x_set_current_limit(struct bq2415x_device *bq, int mA)
538{
539 int val;
540 if (mA <= 100)
541 val = 0;
542 else if (mA <= 500)
543 val = 1;
544 else if (mA <= 800)
545 val = 2;
546 else
547 val = 3;
548 return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CONTROL, val,
549 BQ2415X_MASK_LIMIT, BQ2415X_SHIFT_LIMIT);
550}
551
552/* get current limit in mA */
553static int bq2415x_get_current_limit(struct bq2415x_device *bq)
554{
555 int ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CONTROL,
556 BQ2415X_MASK_LIMIT, BQ2415X_SHIFT_LIMIT);
557 if (ret < 0)
558 return ret;
559 else if (ret == 0)
560 return 100;
561 else if (ret == 1)
562 return 500;
563 else if (ret == 2)
564 return 800;
565 else if (ret == 3)
566 return 1800;
567 else
568 return -EINVAL;
569}
570
571/* set weak battery voltage in mV */
572static int bq2415x_set_weak_battery_voltage(struct bq2415x_device *bq, int mV)
573{
574 /* round to 100mV */
575 int val;
576 if (mV <= 3400 + 50)
577 val = 0;
578 else if (mV <= 3500 + 50)
579 val = 1;
580 else if (mV <= 3600 + 50)
581 val = 2;
582 else
583 val = 3;
584 return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CONTROL, val,
585 BQ2415X_MASK_VLOWV, BQ2415X_SHIFT_VLOWV);
586}
587
588/* get weak battery voltage in mV */
589static int bq2415x_get_weak_battery_voltage(struct bq2415x_device *bq)
590{
591 int ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CONTROL,
592 BQ2415X_MASK_VLOWV, BQ2415X_SHIFT_VLOWV);
593 if (ret < 0)
594 return ret;
595 else
596 return 100 * (34 + ret);
597}
598
599/* set battery regulation voltage in mV */
600static int bq2415x_set_battery_regulation_voltage(struct bq2415x_device *bq,
601 int mV)
602{
603 int val = (mV/10 - 350) / 2;
604
605 if (val < 0)
606 val = 0;
607 else if (val > 94) /* FIXME: Max is 94 or 122 ? Set max value ? */
608 return -EINVAL;
609
610 return bq2415x_i2c_write_mask(bq, BQ2415X_REG_VOLTAGE, val,
611 BQ2415X_MASK_VO, BQ2415X_SHIFT_VO);
612}
613
614/* get battery regulation voltage in mV */
615static int bq2415x_get_battery_regulation_voltage(struct bq2415x_device *bq)
616{
617 int ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_VOLTAGE,
618 BQ2415X_MASK_VO, BQ2415X_SHIFT_VO);
619 if (ret < 0)
620 return ret;
621 else
622 return 10 * (350 + 2*ret);
623}
624
625/* set charge current in mA (platform data must provide resistor sense) */
626static int bq2415x_set_charge_current(struct bq2415x_device *bq, int mA)
627{
628 int val;
629 if (bq->init_data.resistor_sense <= 0)
630 return -ENOSYS;
631
632 val = (mA * bq->init_data.resistor_sense - 37400) / 6800;
633
634 if (val < 0)
635 val = 0;
636 else if (val > 7)
637 val = 7;
638
639 return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CURRENT, val,
640 BQ2415X_MASK_VI_CHRG | BQ2415X_MASK_RESET,
641 BQ2415X_SHIFT_VI_CHRG);
642}
643
644/* get charge current in mA (platform data must provide resistor sense) */
645static int bq2415x_get_charge_current(struct bq2415x_device *bq)
646{
647 int ret;
648 if (bq->init_data.resistor_sense <= 0)
649 return -ENOSYS;
650
651 ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CURRENT,
652 BQ2415X_MASK_VI_CHRG, BQ2415X_SHIFT_VI_CHRG);
653 if (ret < 0)
654 return ret;
655 else
656 return (37400 + 6800*ret) / bq->init_data.resistor_sense;
657}
658
659/* set termination current in mA (platform data must provide resistor sense) */
660static int bq2415x_set_termination_current(struct bq2415x_device *bq, int mA)
661{
662 int val;
663 if (bq->init_data.resistor_sense <= 0)
664 return -ENOSYS;
665
666 val = (mA * bq->init_data.resistor_sense - 3400) / 3400;
667
668 if (val < 0)
669 val = 0;
670 else if (val > 7)
671 val = 7;
672
673 return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CURRENT, val,
674 BQ2415X_MASK_VI_TERM | BQ2415X_MASK_RESET,
675 BQ2415X_SHIFT_VI_TERM);
676}
677
678/* get termination current in mA (platform data must provide resistor sense) */
679static int bq2415x_get_termination_current(struct bq2415x_device *bq)
680{
681 int ret;
682 if (bq->init_data.resistor_sense <= 0)
683 return -ENOSYS;
684
685 ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CURRENT,
686 BQ2415X_MASK_VI_TERM, BQ2415X_SHIFT_VI_TERM);
687 if (ret < 0)
688 return ret;
689 else
690 return (3400 + 3400*ret) / bq->init_data.resistor_sense;
691}
692
693/* set default value of property */
694#define bq2415x_set_default_value(bq, prop) \
695 do { \
696 int ret = 0; \
697 if (bq->init_data.prop != -1) \
698 ret = bq2415x_set_##prop(bq, bq->init_data.prop); \
699 if (ret < 0) \
700 return ret; \
701 } while (0)
702
703/* set default values of all properties */
704static int bq2415x_set_defaults(struct bq2415x_device *bq)
705{
706 bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_DISABLE);
707 bq2415x_exec_command(bq, BQ2415X_CHARGER_DISABLE);
708 bq2415x_exec_command(bq, BQ2415X_CHARGE_TERMINATION_DISABLE);
709 bq2415x_set_default_value(bq, current_limit);
710 bq2415x_set_default_value(bq, weak_battery_voltage);
711 bq2415x_set_default_value(bq, battery_regulation_voltage);
712 if (bq->init_data.resistor_sense > 0) {
713 bq2415x_set_default_value(bq, charge_current);
714 bq2415x_set_default_value(bq, termination_current);
715 bq2415x_exec_command(bq, BQ2415X_CHARGE_TERMINATION_ENABLE);
716 }
717 bq2415x_exec_command(bq, BQ2415X_CHARGER_ENABLE);
718 return 0;
719}
720
721/**** charger mode functions ****/
722
723/* set charger mode */
724static int bq2415x_set_mode(struct bq2415x_device *bq, enum bq2415x_mode mode)
725{
726 int ret = 0;
727 int charger = 0;
728 int boost = 0;
729
730 if (mode == BQ2415X_MODE_HOST_CHARGER ||
731 mode == BQ2415X_MODE_DEDICATED_CHARGER)
732 charger = 1;
733
734 if (mode == BQ2415X_MODE_BOOST)
735 boost = 1;
736
737 if (!charger)
738 ret = bq2415x_exec_command(bq, BQ2415X_CHARGER_DISABLE);
739
740 if (!boost)
741 ret = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_DISABLE);
742
743 if (ret < 0)
744 return ret;
745
746 switch (mode) {
747 case BQ2415X_MODE_NONE:
748 dev_dbg(bq->dev, "changing mode to: N/A\n");
749 ret = bq2415x_set_current_limit(bq, 100);
750 break;
751 case BQ2415X_MODE_HOST_CHARGER:
752 dev_dbg(bq->dev, "changing mode to: Host/HUB charger\n");
753 ret = bq2415x_set_current_limit(bq, 500);
754 break;
755 case BQ2415X_MODE_DEDICATED_CHARGER:
756 dev_dbg(bq->dev, "changing mode to: Dedicated charger\n");
757 ret = bq2415x_set_current_limit(bq, 1800);
758 break;
759 case BQ2415X_MODE_BOOST: /* Boost mode */
760 dev_dbg(bq->dev, "changing mode to: Boost\n");
761 ret = bq2415x_set_current_limit(bq, 100);
762 break;
763 }
764
765 if (ret < 0)
766 return ret;
767
768 if (charger)
769 ret = bq2415x_exec_command(bq, BQ2415X_CHARGER_ENABLE);
770 else if (boost)
771 ret = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_ENABLE);
772
773 if (ret < 0)
774 return ret;
775
776 bq2415x_set_default_value(bq, weak_battery_voltage);
777 bq2415x_set_default_value(bq, battery_regulation_voltage);
778
779 bq->mode = mode;
780 sysfs_notify(&bq->charger.dev->kobj, NULL, "mode");
781
782 return 0;
783
784}
785
786/* hook function called by other driver which set reported mode */
787static void bq2415x_hook_function(enum bq2415x_mode mode, void *data)
788{
789 struct bq2415x_device *bq = data;
790
791 if (!bq)
792 return;
793
794 dev_dbg(bq->dev, "hook function was called\n");
795 bq->reported_mode = mode;
796
797 /* if automode is not enabled do not tell about reported_mode */
798 if (bq->automode < 1)
799 return;
800
801 sysfs_notify(&bq->charger.dev->kobj, NULL, "reported_mode");
802 bq2415x_set_mode(bq, bq->reported_mode);
803
804}
805
806/**** timer functions ****/
807
808/* enable/disable auto resetting chip timer */
809static void bq2415x_set_autotimer(struct bq2415x_device *bq, int state)
810{
811 mutex_lock(&bq2415x_timer_mutex);
812
813 if (bq->autotimer == state) {
814 mutex_unlock(&bq2415x_timer_mutex);
815 return;
816 }
817
818 bq->autotimer = state;
819
820 if (state) {
821 schedule_delayed_work(&bq->work, BQ2415X_TIMER_TIMEOUT * HZ);
822 bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
823 bq->timer_error = NULL;
824 } else {
825 cancel_delayed_work_sync(&bq->work);
826 }
827
828 mutex_unlock(&bq2415x_timer_mutex);
829}
830
831/* called by bq2415x_timer_work on timer error */
832static void bq2415x_timer_error(struct bq2415x_device *bq, const char *msg)
833{
834 bq->timer_error = msg;
835 sysfs_notify(&bq->charger.dev->kobj, NULL, "timer");
836 dev_err(bq->dev, "%s\n", msg);
837 if (bq->automode > 0)
838 bq->automode = 0;
839 bq2415x_set_mode(bq, BQ2415X_MODE_NONE);
840 bq2415x_set_autotimer(bq, 0);
841}
842
843/* delayed work function for auto resetting chip timer */
844static void bq2415x_timer_work(struct work_struct *work)
845{
846 struct bq2415x_device *bq = container_of(work, struct bq2415x_device,
847 work.work);
848 int ret, error, boost;
849
850 if (!bq->autotimer)
851 return;
852
853 ret = bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
854 if (ret < 0) {
855 bq2415x_timer_error(bq, "Resetting timer failed");
856 return;
857 }
858
859 boost = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_STATUS);
860 if (boost < 0) {
861 bq2415x_timer_error(bq, "Unknown error");
862 return;
863 }
864
865 error = bq2415x_exec_command(bq, BQ2415X_FAULT_STATUS);
866 if (error < 0) {
867 bq2415x_timer_error(bq, "Unknown error");
868 return;
869 }
870
871 if (boost) {
872 switch (error) {
873 /* Non fatal errors, chip is OK */
874 case 0: /* No error */
875 break;
876 case 6: /* Timer expired */
877 dev_err(bq->dev, "Timer expired\n");
878 break;
879 case 3: /* Battery voltage too low */
880 dev_err(bq->dev, "Battery voltage to low\n");
881 break;
882
883 /* Fatal errors, disable and reset chip */
884 case 1: /* Overvoltage protection (chip fried) */
885 bq2415x_timer_error(bq,
886 "Overvoltage protection (chip fried)");
887 return;
888 case 2: /* Overload */
889 bq2415x_timer_error(bq, "Overload");
890 return;
891 case 4: /* Battery overvoltage protection */
892 bq2415x_timer_error(bq,
893 "Battery overvoltage protection");
894 return;
895 case 5: /* Thermal shutdown (too hot) */
896 bq2415x_timer_error(bq,
897 "Thermal shutdown (too hot)");
898 return;
899 case 7: /* N/A */
900 bq2415x_timer_error(bq, "Unknown error");
901 return;
902 }
903 } else {
904 switch (error) {
905 /* Non fatal errors, chip is OK */
906 case 0: /* No error */
907 break;
908 case 2: /* Sleep mode */
909 dev_err(bq->dev, "Sleep mode\n");
910 break;
911 case 3: /* Poor input source */
912 dev_err(bq->dev, "Poor input source\n");
913 break;
914 case 6: /* Timer expired */
915 dev_err(bq->dev, "Timer expired\n");
916 break;
917 case 7: /* No battery */
918 dev_err(bq->dev, "No battery\n");
919 break;
920
921 /* Fatal errors, disable and reset chip */
922 case 1: /* Overvoltage protection (chip fried) */
923 bq2415x_timer_error(bq,
924 "Overvoltage protection (chip fried)");
925 return;
926 case 4: /* Battery overvoltage protection */
927 bq2415x_timer_error(bq,
928 "Battery overvoltage protection");
929 return;
930 case 5: /* Thermal shutdown (too hot) */
931 bq2415x_timer_error(bq,
932 "Thermal shutdown (too hot)");
933 return;
934 }
935 }
936
937 schedule_delayed_work(&bq->work, BQ2415X_TIMER_TIMEOUT * HZ);
938}
939
940/**** power supply interface code ****/
941
942static enum power_supply_property bq2415x_power_supply_props[] = {
943 /* TODO: maybe add more power supply properties */
944 POWER_SUPPLY_PROP_STATUS,
945 POWER_SUPPLY_PROP_MODEL_NAME,
946};
947
948static int bq2415x_power_supply_get_property(struct power_supply *psy,
949 enum power_supply_property psp, union power_supply_propval *val)
950{
951 struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
952 charger);
953 int ret;
954
955 switch (psp) {
956 case POWER_SUPPLY_PROP_STATUS:
957 ret = bq2415x_exec_command(bq, BQ2415X_CHARGE_STATUS);
958 if (ret < 0)
959 return ret;
960 else if (ret == 0) /* Ready */
961 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
962 else if (ret == 1) /* Charge in progress */
963 val->intval = POWER_SUPPLY_STATUS_CHARGING;
964 else if (ret == 2) /* Charge done */
965 val->intval = POWER_SUPPLY_STATUS_FULL;
966 else
967 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
968 break;
969 case POWER_SUPPLY_PROP_MODEL_NAME:
970 val->strval = bq->model;
971 break;
972 default:
973 return -EINVAL;
974 }
975 return 0;
976}
977
978static int bq2415x_power_supply_init(struct bq2415x_device *bq)
979{
980 int ret;
981 int chip;
982 char revstr[8];
983
984 bq->charger.name = bq->name;
985 bq->charger.type = POWER_SUPPLY_TYPE_USB;
986 bq->charger.properties = bq2415x_power_supply_props;
987 bq->charger.num_properties = ARRAY_SIZE(bq2415x_power_supply_props);
988 bq->charger.get_property = bq2415x_power_supply_get_property;
989
990 ret = bq2415x_detect_chip(bq);
991 if (ret < 0)
992 chip = BQUNKNOWN;
993 else
994 chip = ret;
995
996 ret = bq2415x_detect_revision(bq);
997 if (ret < 0)
998 strcpy(revstr, "unknown");
999 else
1000 sprintf(revstr, "1.%d", ret);
1001
1002 bq->model = kasprintf(GFP_KERNEL,
1003 "chip %s, revision %s, vender code %.3d",
1004 bq2415x_chip_name[chip], revstr,
1005 bq2415x_get_vender_code(bq));
1006 if (!bq->model) {
1007 dev_err(bq->dev, "failed to allocate model name\n");
1008 return -ENOMEM;
1009 }
1010
1011 ret = power_supply_register(bq->dev, &bq->charger);
1012 if (ret) {
1013 kfree(bq->model);
1014 return ret;
1015 }
1016
1017 return 0;
1018}
1019
1020static void bq2415x_power_supply_exit(struct bq2415x_device *bq)
1021{
1022 bq->autotimer = 0;
1023 if (bq->automode > 0)
1024 bq->automode = 0;
1025 cancel_delayed_work_sync(&bq->work);
1026 power_supply_unregister(&bq->charger);
1027 kfree(bq->model);
1028}
1029
1030/**** additional sysfs entries for power supply interface ****/
1031
1032/* show *_status entries */
1033static ssize_t bq2415x_sysfs_show_status(struct device *dev,
1034 struct device_attribute *attr, char *buf)
1035{
1036 struct power_supply *psy = dev_get_drvdata(dev);
1037 struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1038 charger);
1039 enum bq2415x_command command;
1040 int ret;
1041
1042 if (strcmp(attr->attr.name, "otg_status") == 0)
1043 command = BQ2415X_OTG_STATUS;
1044 else if (strcmp(attr->attr.name, "charge_status") == 0)
1045 command = BQ2415X_CHARGE_STATUS;
1046 else if (strcmp(attr->attr.name, "boost_status") == 0)
1047 command = BQ2415X_BOOST_STATUS;
1048 else if (strcmp(attr->attr.name, "fault_status") == 0)
1049 command = BQ2415X_FAULT_STATUS;
1050 else
1051 return -EINVAL;
1052
1053 ret = bq2415x_exec_command(bq, command);
1054 if (ret < 0)
1055 return ret;
1056 else
1057 return sprintf(buf, "%d\n", ret);
1058}
1059
1060/* set timer entry:
1061 auto - enable auto mode
1062 off - disable auto mode
1063 (other values) - reset chip timer
1064*/
1065static ssize_t bq2415x_sysfs_set_timer(struct device *dev,
1066 struct device_attribute *attr, const char *buf, size_t count)
1067{
1068 struct power_supply *psy = dev_get_drvdata(dev);
1069 struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1070 charger);
1071 int ret = 0;
1072
1073 if (strncmp(buf, "auto", 4) == 0)
1074 bq2415x_set_autotimer(bq, 1);
1075 else if (strncmp(buf, "off", 3) == 0)
1076 bq2415x_set_autotimer(bq, 0);
1077 else
1078 ret = bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
1079
1080 if (ret < 0)
1081 return ret;
1082 else
1083 return count;
1084}
1085
1086/* show timer entry (auto or off) */
1087static ssize_t bq2415x_sysfs_show_timer(struct device *dev,
1088 struct device_attribute *attr, char *buf)
1089{
1090 struct power_supply *psy = dev_get_drvdata(dev);
1091 struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1092 charger);
1093
1094 if (bq->timer_error)
1095 return sprintf(buf, "%s\n", bq->timer_error);
1096
1097 if (bq->autotimer)
1098 return sprintf(buf, "auto\n");
1099 else
1100 return sprintf(buf, "off\n");
1101}
1102
1103/* set mode entry:
1104 auto - if automode is supported, enable it and set mode to reported
1105 none - disable charger and boost mode
1106 host - charging mode for host/hub chargers (current limit 500mA)
1107 dedicated - charging mode for dedicated chargers (unlimited current limit)
1108 boost - disable charger and enable boost mode
1109*/
1110static ssize_t bq2415x_sysfs_set_mode(struct device *dev,
1111 struct device_attribute *attr, const char *buf, size_t count)
1112{
1113 struct power_supply *psy = dev_get_drvdata(dev);
1114 struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1115 charger);
1116 enum bq2415x_mode mode;
1117 int ret = 0;
1118
1119 if (strncmp(buf, "auto", 4) == 0) {
1120 if (bq->automode < 0)
1121 return -ENOSYS;
1122 bq->automode = 1;
1123 mode = bq->reported_mode;
1124 } else if (strncmp(buf, "none", 4) == 0) {
1125 if (bq->automode > 0)
1126 bq->automode = 0;
1127 mode = BQ2415X_MODE_NONE;
1128 } else if (strncmp(buf, "host", 4) == 0) {
1129 if (bq->automode > 0)
1130 bq->automode = 0;
1131 mode = BQ2415X_MODE_HOST_CHARGER;
1132 } else if (strncmp(buf, "dedicated", 9) == 0) {
1133 if (bq->automode > 0)
1134 bq->automode = 0;
1135 mode = BQ2415X_MODE_DEDICATED_CHARGER;
1136 } else if (strncmp(buf, "boost", 5) == 0) {
1137 if (bq->automode > 0)
1138 bq->automode = 0;
1139 mode = BQ2415X_MODE_BOOST;
1140 } else if (strncmp(buf, "reset", 5) == 0) {
1141 bq2415x_reset_chip(bq);
1142 bq2415x_set_defaults(bq);
1143 if (bq->automode <= 0)
1144 return count;
1145 bq->automode = 1;
1146 mode = bq->reported_mode;
1147 } else
1148 return -EINVAL;
1149
1150 ret = bq2415x_set_mode(bq, mode);
1151 if (ret < 0)
1152 return ret;
1153 else
1154 return count;
1155}
1156
1157/* show mode entry (auto, none, host, dedicated or boost) */
1158static ssize_t bq2415x_sysfs_show_mode(struct device *dev,
1159 struct device_attribute *attr, char *buf)
1160{
1161 struct power_supply *psy = dev_get_drvdata(dev);
1162 struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1163 charger);
1164 ssize_t ret = 0;
1165
1166 if (bq->automode > 0)
1167 ret += sprintf(buf+ret, "auto (");
1168
1169 switch (bq->mode) {
1170 case BQ2415X_MODE_NONE:
1171 ret += sprintf(buf+ret, "none");
1172 break;
1173 case BQ2415X_MODE_HOST_CHARGER:
1174 ret += sprintf(buf+ret, "host");
1175 break;
1176 case BQ2415X_MODE_DEDICATED_CHARGER:
1177 ret += sprintf(buf+ret, "dedicated");
1178 break;
1179 case BQ2415X_MODE_BOOST:
1180 ret += sprintf(buf+ret, "boost");
1181 break;
1182 }
1183
1184 if (bq->automode > 0)
1185 ret += sprintf(buf+ret, ")");
1186
1187 ret += sprintf(buf+ret, "\n");
1188 return ret;
1189}
1190
1191/* show reported_mode entry (none, host, dedicated or boost) */
1192static ssize_t bq2415x_sysfs_show_reported_mode(struct device *dev,
1193 struct device_attribute *attr, char *buf)
1194{
1195 struct power_supply *psy = dev_get_drvdata(dev);
1196 struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1197 charger);
1198
1199 if (bq->automode < 0)
1200 return -EINVAL;
1201
1202 switch (bq->reported_mode) {
1203 case BQ2415X_MODE_NONE:
1204 return sprintf(buf, "none\n");
1205 case BQ2415X_MODE_HOST_CHARGER:
1206 return sprintf(buf, "host\n");
1207 case BQ2415X_MODE_DEDICATED_CHARGER:
1208 return sprintf(buf, "dedicated\n");
1209 case BQ2415X_MODE_BOOST:
1210 return sprintf(buf, "boost\n");
1211 }
1212
1213 return -EINVAL;
1214}
1215
1216/* directly set raw value to chip register, format: 'register value' */
1217static ssize_t bq2415x_sysfs_set_registers(struct device *dev,
1218 struct device_attribute *attr, const char *buf, size_t count)
1219{
1220 struct power_supply *psy = dev_get_drvdata(dev);
1221 struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1222 charger);
1223 ssize_t ret = 0;
1224 unsigned int reg;
1225 unsigned int val;
1226
1227 if (sscanf(buf, "%x %x", &reg, &val) != 2)
1228 return -EINVAL;
1229
1230 if (reg > 4 || val > 255)
1231 return -EINVAL;
1232
1233 ret = bq2415x_i2c_write(bq, reg, val);
1234 if (ret < 0)
1235 return ret;
1236 else
1237 return count;
1238}
1239
1240/* print value of chip register, format: 'register=value' */
1241static ssize_t bq2415x_sysfs_print_reg(struct bq2415x_device *bq,
1242 u8 reg, char *buf)
1243{
1244 int ret = bq2415x_i2c_read(bq, reg);
1245 if (ret < 0)
1246 return sprintf(buf, "%#.2x=error %d\n", reg, ret);
1247 else
1248 return sprintf(buf, "%#.2x=%#.2x\n", reg, ret);
1249}
1250
1251/* show all raw values of chip register, format per line: 'register=value' */
1252static ssize_t bq2415x_sysfs_show_registers(struct device *dev,
1253 struct device_attribute *attr, char *buf)
1254{
1255 struct power_supply *psy = dev_get_drvdata(dev);
1256 struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1257 charger);
1258 ssize_t ret = 0;
1259
1260 ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_STATUS, buf+ret);
1261 ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CONTROL, buf+ret);
1262 ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VOLTAGE, buf+ret);
1263 ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VENDER, buf+ret);
1264 ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CURRENT, buf+ret);
1265 return ret;
1266}
1267
1268/* set current and voltage limit entries (in mA or mV) */
1269static ssize_t bq2415x_sysfs_set_limit(struct device *dev,
1270 struct device_attribute *attr, const char *buf, size_t count)
1271{
1272 struct power_supply *psy = dev_get_drvdata(dev);
1273 struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1274 charger);
1275 long val;
1276 int ret;
1277
1278 if (kstrtol(buf, 10, &val) < 0)
1279 return -EINVAL;
1280
1281 if (strcmp(attr->attr.name, "current_limit") == 0)
1282 ret = bq2415x_set_current_limit(bq, val);
1283 else if (strcmp(attr->attr.name, "weak_battery_voltage") == 0)
1284 ret = bq2415x_set_weak_battery_voltage(bq, val);
1285 else if (strcmp(attr->attr.name, "battery_regulation_voltage") == 0)
1286 ret = bq2415x_set_battery_regulation_voltage(bq, val);
1287 else if (strcmp(attr->attr.name, "charge_current") == 0)
1288 ret = bq2415x_set_charge_current(bq, val);
1289 else if (strcmp(attr->attr.name, "termination_current") == 0)
1290 ret = bq2415x_set_termination_current(bq, val);
1291 else
1292 return -EINVAL;
1293
1294 if (ret < 0)
1295 return ret;
1296 else
1297 return count;
1298}
1299
1300/* show current and voltage limit entries (in mA or mV) */
1301static ssize_t bq2415x_sysfs_show_limit(struct device *dev,
1302 struct device_attribute *attr, char *buf)
1303{
1304 struct power_supply *psy = dev_get_drvdata(dev);
1305 struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1306 charger);
1307 int ret;
1308
1309 if (strcmp(attr->attr.name, "current_limit") == 0)
1310 ret = bq2415x_get_current_limit(bq);
1311 else if (strcmp(attr->attr.name, "weak_battery_voltage") == 0)
1312 ret = bq2415x_get_weak_battery_voltage(bq);
1313 else if (strcmp(attr->attr.name, "battery_regulation_voltage") == 0)
1314 ret = bq2415x_get_battery_regulation_voltage(bq);
1315 else if (strcmp(attr->attr.name, "charge_current") == 0)
1316 ret = bq2415x_get_charge_current(bq);
1317 else if (strcmp(attr->attr.name, "termination_current") == 0)
1318 ret = bq2415x_get_termination_current(bq);
1319 else
1320 return -EINVAL;
1321
1322 if (ret < 0)
1323 return ret;
1324 else
1325 return sprintf(buf, "%d\n", ret);
1326}
1327
1328/* set *_enable entries */
1329static ssize_t bq2415x_sysfs_set_enable(struct device *dev,
1330 struct device_attribute *attr, const char *buf, size_t count)
1331{
1332 struct power_supply *psy = dev_get_drvdata(dev);
1333 struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1334 charger);
1335 enum bq2415x_command command;
1336 long val;
1337 int ret;
1338
1339 if (kstrtol(buf, 10, &val) < 0)
1340 return -EINVAL;
1341
1342 if (strcmp(attr->attr.name, "charge_termination_enable") == 0)
1343 command = val ? BQ2415X_CHARGE_TERMINATION_ENABLE :
1344 BQ2415X_CHARGE_TERMINATION_DISABLE;
1345 else if (strcmp(attr->attr.name, "high_impedance_enable") == 0)
1346 command = val ? BQ2415X_HIGH_IMPEDANCE_ENABLE :
1347 BQ2415X_HIGH_IMPEDANCE_DISABLE;
1348 else if (strcmp(attr->attr.name, "otg_pin_enable") == 0)
1349 command = val ? BQ2415X_OTG_PIN_ENABLE :
1350 BQ2415X_OTG_PIN_DISABLE;
1351 else if (strcmp(attr->attr.name, "stat_pin_enable") == 0)
1352 command = val ? BQ2415X_STAT_PIN_ENABLE :
1353 BQ2415X_STAT_PIN_DISABLE;
1354 else
1355 return -EINVAL;
1356
1357 ret = bq2415x_exec_command(bq, command);
1358 if (ret < 0)
1359 return ret;
1360 else
1361 return count;
1362}
1363
1364/* show *_enable entries */
1365static ssize_t bq2415x_sysfs_show_enable(struct device *dev,
1366 struct device_attribute *attr, char *buf)
1367{
1368 struct power_supply *psy = dev_get_drvdata(dev);
1369 struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1370 charger);
1371 enum bq2415x_command command;
1372 int ret;
1373
1374 if (strcmp(attr->attr.name, "charge_termination_enable") == 0)
1375 command = BQ2415X_CHARGE_TERMINATION_STATUS;
1376 else if (strcmp(attr->attr.name, "high_impedance_enable") == 0)
1377 command = BQ2415X_HIGH_IMPEDANCE_STATUS;
1378 else if (strcmp(attr->attr.name, "otg_pin_enable") == 0)
1379 command = BQ2415X_OTG_PIN_STATUS;
1380 else if (strcmp(attr->attr.name, "stat_pin_enable") == 0)
1381 command = BQ2415X_STAT_PIN_STATUS;
1382 else
1383 return -EINVAL;
1384
1385 ret = bq2415x_exec_command(bq, command);
1386 if (ret < 0)
1387 return ret;
1388 else
1389 return sprintf(buf, "%d\n", ret);
1390}
1391
1392static DEVICE_ATTR(current_limit, S_IWUSR | S_IRUGO,
1393 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1394static DEVICE_ATTR(weak_battery_voltage, S_IWUSR | S_IRUGO,
1395 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1396static DEVICE_ATTR(battery_regulation_voltage, S_IWUSR | S_IRUGO,
1397 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1398static DEVICE_ATTR(charge_current, S_IWUSR | S_IRUGO,
1399 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1400static DEVICE_ATTR(termination_current, S_IWUSR | S_IRUGO,
1401 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1402
1403static DEVICE_ATTR(charge_termination_enable, S_IWUSR | S_IRUGO,
1404 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1405static DEVICE_ATTR(high_impedance_enable, S_IWUSR | S_IRUGO,
1406 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1407static DEVICE_ATTR(otg_pin_enable, S_IWUSR | S_IRUGO,
1408 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1409static DEVICE_ATTR(stat_pin_enable, S_IWUSR | S_IRUGO,
1410 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1411
1412static DEVICE_ATTR(reported_mode, S_IRUGO,
1413 bq2415x_sysfs_show_reported_mode, NULL);
1414static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO,
1415 bq2415x_sysfs_show_mode, bq2415x_sysfs_set_mode);
1416static DEVICE_ATTR(timer, S_IWUSR | S_IRUGO,
1417 bq2415x_sysfs_show_timer, bq2415x_sysfs_set_timer);
1418
1419static DEVICE_ATTR(registers, S_IWUSR | S_IRUGO,
1420 bq2415x_sysfs_show_registers, bq2415x_sysfs_set_registers);
1421
1422static DEVICE_ATTR(otg_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1423static DEVICE_ATTR(charge_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1424static DEVICE_ATTR(boost_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1425static DEVICE_ATTR(fault_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1426
1427static struct attribute *bq2415x_sysfs_attributes[] = {
1428 &dev_attr_current_limit.attr,
1429 &dev_attr_weak_battery_voltage.attr,
1430 &dev_attr_battery_regulation_voltage.attr,
1431 &dev_attr_charge_current.attr,
1432 &dev_attr_termination_current.attr,
1433
1434 &dev_attr_charge_termination_enable.attr,
1435 &dev_attr_high_impedance_enable.attr,
1436 &dev_attr_otg_pin_enable.attr,
1437 &dev_attr_stat_pin_enable.attr,
1438
1439 &dev_attr_reported_mode.attr,
1440 &dev_attr_mode.attr,
1441 &dev_attr_timer.attr,
1442
1443 &dev_attr_registers.attr,
1444
1445 &dev_attr_otg_status.attr,
1446 &dev_attr_charge_status.attr,
1447 &dev_attr_boost_status.attr,
1448 &dev_attr_fault_status.attr,
1449 NULL,
1450};
1451
1452static const struct attribute_group bq2415x_sysfs_attr_group = {
1453 .attrs = bq2415x_sysfs_attributes,
1454};
1455
1456static int bq2415x_sysfs_init(struct bq2415x_device *bq)
1457{
1458 return sysfs_create_group(&bq->charger.dev->kobj,
1459 &bq2415x_sysfs_attr_group);
1460}
1461
1462static void bq2415x_sysfs_exit(struct bq2415x_device *bq)
1463{
1464 sysfs_remove_group(&bq->charger.dev->kobj, &bq2415x_sysfs_attr_group);
1465}
1466
1467/* main bq2415x probe function */
1468static int bq2415x_probe(struct i2c_client *client,
1469 const struct i2c_device_id *id)
1470{
1471 int ret;
1472 int num;
1473 char *name;
1474 struct bq2415x_device *bq;
1475
1476 if (!client->dev.platform_data) {
1477 dev_err(&client->dev, "platform data not set\n");
1478 return -ENODEV;
1479 }
1480
1481 /* Get new ID for the new device */
1482 ret = idr_pre_get(&bq2415x_id, GFP_KERNEL);
1483 if (ret == 0)
1484 return -ENOMEM;
1485
1486 mutex_lock(&bq2415x_id_mutex);
1487 ret = idr_get_new(&bq2415x_id, client, &num);
1488 mutex_unlock(&bq2415x_id_mutex);
1489
1490 if (ret < 0)
1491 return ret;
1492
1493 name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
1494 if (!name) {
1495 dev_err(&client->dev, "failed to allocate device name\n");
1496 ret = -ENOMEM;
1497 goto error_1;
1498 }
1499
1500 bq = kzalloc(sizeof(*bq), GFP_KERNEL);
1501 if (!bq) {
1502 dev_err(&client->dev, "failed to allocate device data\n");
1503 ret = -ENOMEM;
1504 goto error_2;
1505 }
1506
1507 i2c_set_clientdata(client, bq);
1508
1509 bq->id = num;
1510 bq->dev = &client->dev;
1511 bq->chip = id->driver_data;
1512 bq->name = name;
1513 bq->mode = BQ2415X_MODE_NONE;
1514 bq->reported_mode = BQ2415X_MODE_NONE;
1515 bq->autotimer = 0;
1516 bq->automode = 0;
1517
1518 memcpy(&bq->init_data, client->dev.platform_data,
1519 sizeof(bq->init_data));
1520
1521 bq2415x_reset_chip(bq);
1522
1523 ret = bq2415x_power_supply_init(bq);
1524 if (ret) {
1525 dev_err(bq->dev, "failed to register power supply: %d\n", ret);
1526 goto error_3;
1527 }
1528
1529 ret = bq2415x_sysfs_init(bq);
1530 if (ret) {
1531 dev_err(bq->dev, "failed to create sysfs entries: %d\n", ret);
1532 goto error_4;
1533 }
1534
1535 ret = bq2415x_set_defaults(bq);
1536 if (ret) {
1537 dev_err(bq->dev, "failed to set default values: %d\n", ret);
1538 goto error_5;
1539 }
1540
1541 if (bq->init_data.set_mode_hook) {
1542 if (bq->init_data.set_mode_hook(
1543 bq2415x_hook_function, bq)) {
1544 bq->automode = 1;
1545 bq2415x_set_mode(bq, bq->reported_mode);
1546 dev_info(bq->dev, "automode enabled\n");
1547 } else {
1548 bq->automode = -1;
1549 dev_info(bq->dev, "automode failed\n");
1550 }
1551 } else {
1552 bq->automode = -1;
1553 dev_info(bq->dev, "automode not supported\n");
1554 }
1555
1556 INIT_DELAYED_WORK(&bq->work, bq2415x_timer_work);
1557 bq2415x_set_autotimer(bq, 1);
1558
1559 dev_info(bq->dev, "driver registered\n");
1560 return 0;
1561
1562error_5:
1563 bq2415x_sysfs_exit(bq);
1564error_4:
1565 bq2415x_power_supply_exit(bq);
1566error_3:
1567 kfree(bq);
1568error_2:
1569 kfree(name);
1570error_1:
1571 mutex_lock(&bq2415x_id_mutex);
1572 idr_remove(&bq2415x_id, num);
1573 mutex_unlock(&bq2415x_id_mutex);
1574
1575 return ret;
1576}
1577
1578/* main bq2415x remove function */
1579
1580static int bq2415x_remove(struct i2c_client *client)
1581{
1582 struct bq2415x_device *bq = i2c_get_clientdata(client);
1583
1584 if (bq->init_data.set_mode_hook)
1585 bq->init_data.set_mode_hook(NULL, NULL);
1586
1587 bq2415x_sysfs_exit(bq);
1588 bq2415x_power_supply_exit(bq);
1589
1590 bq2415x_reset_chip(bq);
1591
1592 mutex_lock(&bq2415x_id_mutex);
1593 idr_remove(&bq2415x_id, bq->id);
1594 mutex_unlock(&bq2415x_id_mutex);
1595
1596 dev_info(bq->dev, "driver unregistered\n");
1597
1598 kfree(bq->name);
1599 kfree(bq);
1600
1601 return 0;
1602}
1603
1604static const struct i2c_device_id bq2415x_i2c_id_table[] = {
1605 { "bq2415x", BQUNKNOWN },
1606 { "bq24150", BQ24150 },
1607 { "bq24150a", BQ24150A },
1608 { "bq24151", BQ24151 },
1609 { "bq24151a", BQ24151A },
1610 { "bq24152", BQ24152 },
1611 { "bq24153", BQ24153 },
1612 { "bq24153a", BQ24153A },
1613 { "bq24155", BQ24155 },
1614 { "bq24156", BQ24156 },
1615 { "bq24156a", BQ24156A },
1616 { "bq24158", BQ24158 },
1617 {},
1618};
1619MODULE_DEVICE_TABLE(i2c, bq2415x_i2c_id_table);
1620
1621static struct i2c_driver bq2415x_driver = {
1622 .driver = {
1623 .name = "bq2415x-charger",
1624 },
1625 .probe = bq2415x_probe,
1626 .remove = bq2415x_remove,
1627 .id_table = bq2415x_i2c_id_table,
1628};
1629
1630static int __init bq2415x_init(void)
1631{
1632 return i2c_add_driver(&bq2415x_driver);
1633}
1634module_init(bq2415x_init);
1635
1636static void __exit bq2415x_exit(void)
1637{
1638 i2c_del_driver(&bq2415x_driver);
1639}
1640module_exit(bq2415x_exit);
1641
1642MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
1643MODULE_DESCRIPTION("bq2415x charger driver");
1644MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-29 04:57:27 -0500