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authorPali Rohár <pali.rohar@gmail.com>2012-11-02 15:18:11 -0400
committerAnton Vorontsov <cbouatmailru@gmail.com>2012-11-18 18:39:04 -0500
commit0bc98cc6155205b615a9d29a2d54d1b839521c04 (patch)
tree285b6f17d4f050203aa0b14a0cffe63b43970569 /drivers/power
parent04930baf28f08cd275e4afbf5a335b42335705df (diff)
power_supply: Add bq2415x charger driver
The bq2415x charger driver is needed for example on Nokia N900 for charging battery. Driver is part of open source project to replace proprietary battery management. Signed-off-by: Pali Rohár <pali.rohar@gmail.com> Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Diffstat (limited to 'drivers/power')
-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 000000000000..017b3c27f769
--- /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 2024-09-29 18:32:08 -0400