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drivers/leds/leds-lp5523.c: adjust delays and add comments to them
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / leds / leds-lp5521.c
CommitLineData
500fe141
SO		 1/*
2 * LP5521 LED chip driver.
3 *
4 * Copyright (C) 2010 Nokia Corporation
5 *
6 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 */
22
23#include <linux/module.h>
24#include <linux/init.h>
25#include <linux/i2c.h>
26#include <linux/mutex.h>
27#include <linux/gpio.h>
28#include <linux/interrupt.h>
29#include <linux/delay.h>
30#include <linux/ctype.h>
31#include <linux/spinlock.h>
32#include <linux/wait.h>
33#include <linux/leds.h>
34#include <linux/leds-lp5521.h>
35#include <linux/workqueue.h>
36#include <linux/slab.h>
37
38#define LP5521_PROGRAM_LENGTH 32 /* in bytes */
39
40#define LP5521_MAX_LEDS 3 /* Maximum number of LEDs */
41#define LP5521_MAX_ENGINES 3 /* Maximum number of engines */
42
43#define LP5521_ENG_MASK_BASE 0x30 /* 00110000 */
44#define LP5521_ENG_STATUS_MASK 0x07 /* 00000111 */
45
46#define LP5521_CMD_LOAD 0x15 /* 00010101 */
47#define LP5521_CMD_RUN 0x2a /* 00101010 */
48#define LP5521_CMD_DIRECT 0x3f /* 00111111 */
49#define LP5521_CMD_DISABLED 0x00 /* 00000000 */
50
51/* Registers */
52#define LP5521_REG_ENABLE 0x00
53#define LP5521_REG_OP_MODE 0x01
54#define LP5521_REG_R_PWM 0x02
55#define LP5521_REG_G_PWM 0x03
56#define LP5521_REG_B_PWM 0x04
57#define LP5521_REG_R_CURRENT 0x05
58#define LP5521_REG_G_CURRENT 0x06
59#define LP5521_REG_B_CURRENT 0x07
60#define LP5521_REG_CONFIG 0x08
61#define LP5521_REG_R_CHANNEL_PC 0x09
62#define LP5521_REG_G_CHANNEL_PC 0x0A
63#define LP5521_REG_B_CHANNEL_PC 0x0B
64#define LP5521_REG_STATUS 0x0C
65#define LP5521_REG_RESET 0x0D
66#define LP5521_REG_GPO 0x0E
67#define LP5521_REG_R_PROG_MEM 0x10
68#define LP5521_REG_G_PROG_MEM 0x30
69#define LP5521_REG_B_PROG_MEM 0x50
70
71#define LP5521_PROG_MEM_BASE LP5521_REG_R_PROG_MEM
72#define LP5521_PROG_MEM_SIZE 0x20
73
74/* Base register to set LED current */
75#define LP5521_REG_LED_CURRENT_BASE LP5521_REG_R_CURRENT
76
77/* Base register to set the brightness */
78#define LP5521_REG_LED_PWM_BASE LP5521_REG_R_PWM
79
80/* Bits in ENABLE register */
81#define LP5521_MASTER_ENABLE 0x40 /* Chip master enable */
82#define LP5521_LOGARITHMIC_PWM 0x80 /* Logarithmic PWM adjustment */
83#define LP5521_EXEC_RUN 0x2A
84
85/* Bits in CONFIG register */
86#define LP5521_PWM_HF 0x40 /* PWM: 0 = 256Hz, 1 = 558Hz */
87#define LP5521_PWRSAVE_EN 0x20 /* 1 = Power save mode */
88#define LP5521_CP_MODE_OFF 0 /* Charge pump (CP) off */
89#define LP5521_CP_MODE_BYPASS 8 /* CP forced to bypass mode */
90#define LP5521_CP_MODE_1X5 0x10 /* CP forced to 1.5x mode */
91#define LP5521_CP_MODE_AUTO 0x18 /* Automatic mode selection */
92#define LP5521_R_TO_BATT 4 /* R out: 0 = CP, 1 = Vbat */
93#define LP5521_CLK_SRC_EXT 0 /* Ext-clk source (CLK_32K) */
94#define LP5521_CLK_INT 1 /* Internal clock */
95#define LP5521_CLK_AUTO 2 /* Automatic clock selection */
96
97/* Status */
98#define LP5521_EXT_CLK_USED 0x08
99
100struct lp5521_engine {
101 const struct attribute_group *attributes;
102 int id;
103 u8 mode;
104 u8 prog_page;
105 u8 engine_mask;
106};
107
108struct lp5521_led {
109 int id;
110 u8 chan_nr;
111 u8 led_current;
112 u8 max_current;
113 struct led_classdev cdev;
114 struct work_struct brightness_work;
115 u8 brightness;
116};
117
118struct lp5521_chip {
119 struct lp5521_platform_data *pdata;
120 struct mutex lock; /* Serialize control */
121 struct i2c_client *client;
122 struct lp5521_engine engines[LP5521_MAX_ENGINES];
123 struct lp5521_led leds[LP5521_MAX_LEDS];
124 u8 num_channels;
125 u8 num_leds;
126};
127
9fdb18b6
SO		 128static inline struct lp5521_led *cdev_to_led(struct led_classdev *cdev)
129{
130 return container_of(cdev, struct lp5521_led, cdev);
131}
132
133static inline struct lp5521_chip *engine_to_lp5521(struct lp5521_engine *engine)
134{
135 return container_of(engine, struct lp5521_chip,
136 engines[engine->id - 1]);
137}
138
139static inline struct lp5521_chip *led_to_lp5521(struct lp5521_led *led)
140{
141 return container_of(led, struct lp5521_chip,
142 leds[led->id]);
143}
500fe141
SO		 144
145static void lp5521_led_brightness_work(struct work_struct *work);
146
147static inline int lp5521_write(struct i2c_client *client, u8 reg, u8 value)
148{
149 return i2c_smbus_write_byte_data(client, reg, value);
150}
151
152static int lp5521_read(struct i2c_client *client, u8 reg, u8 *buf)
153{
154 s32 ret;
155
156 ret = i2c_smbus_read_byte_data(client, reg);
157 if (ret < 0)
158 return -EIO;
159
160 *buf = ret;
161 return 0;
162}
163
164static int lp5521_set_engine_mode(struct lp5521_engine *engine, u8 mode)
165{
166 struct lp5521_chip *chip = engine_to_lp5521(engine);
167 struct i2c_client *client = chip->client;
168 int ret;
169 u8 engine_state;
170
171 /* Only transition between RUN and DIRECT mode are handled here */
172 if (mode == LP5521_CMD_LOAD)
173 return 0;
174
175 if (mode == LP5521_CMD_DISABLED)
176 mode = LP5521_CMD_DIRECT;
177
178 ret = lp5521_read(client, LP5521_REG_OP_MODE, &engine_state);
179
180 /* set mode only for this engine */
181 engine_state &= ~(engine->engine_mask);
182 mode &= engine->engine_mask;
183 engine_state |= mode;
184 ret |= lp5521_write(client, LP5521_REG_OP_MODE, engine_state);
185
186 return ret;
187}
188
189static int lp5521_load_program(struct lp5521_engine *eng, const u8 *pattern)
190{
191 struct lp5521_chip *chip = engine_to_lp5521(eng);
192 struct i2c_client *client = chip->client;
193 int ret;
194 int addr;
195 u8 mode;
196
197 /* move current engine to direct mode and remember the state */
198 ret = lp5521_set_engine_mode(eng, LP5521_CMD_DIRECT);
09c76b0f
SO		 199 /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
200 usleep_range(1000, 2000);
500fe141
SO		 201 ret |= lp5521_read(client, LP5521_REG_OP_MODE, &mode);
202
203 /* For loading, all the engines to load mode */
204 lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
09c76b0f
SO		 205 /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
206 usleep_range(1000, 2000);
500fe141 207 lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_LOAD);
09c76b0f
SO		 208 /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
209 usleep_range(1000, 2000);
500fe141
SO		 210
211 addr = LP5521_PROG_MEM_BASE + eng->prog_page * LP5521_PROG_MEM_SIZE;
212 i2c_smbus_write_i2c_block_data(client,
213 addr,
214 LP5521_PROG_MEM_SIZE,
215 pattern);
216
217 ret |= lp5521_write(client, LP5521_REG_OP_MODE, mode);
218 return ret;
219}
220
221static int lp5521_set_led_current(struct lp5521_chip *chip, int led, u8 curr)
222{
223 return lp5521_write(chip->client,
224 LP5521_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
225 curr);
226}
227
228static void lp5521_init_engine(struct lp5521_chip *chip,
229 const struct attribute_group *attr_group)
230{
231 int i;
232 for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
233 chip->engines[i].id = i + 1;
234 chip->engines[i].engine_mask = LP5521_ENG_MASK_BASE >> (i * 2);
235 chip->engines[i].prog_page = i;
236 chip->engines[i].attributes = &attr_group[i];
237 }
238}
239
240static int lp5521_configure(struct i2c_client *client,
241 const struct attribute_group *attr_group)
242{
243 struct lp5521_chip *chip = i2c_get_clientdata(client);
244 int ret;
245
246 lp5521_init_engine(chip, attr_group);
247
248 lp5521_write(client, LP5521_REG_RESET, 0xff);
249
09c76b0f
SO		 250 usleep_range(10000, 20000); /*
251 * Exact value is not available. 10 - 20ms
252 * appears to be enough for reset.
253 */
500fe141
SO		 254
255 /* Set all PWMs to direct control mode */
256 ret = lp5521_write(client, LP5521_REG_OP_MODE, 0x3F);
257
258 /* Enable auto-powersave, set charge pump to auto, red to battery */
259 ret |= lp5521_write(client, LP5521_REG_CONFIG,
260 LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO | LP5521_R_TO_BATT);
261
262 /* Initialize all channels PWM to zero -> leds off */
263 ret |= lp5521_write(client, LP5521_REG_R_PWM, 0);
264 ret |= lp5521_write(client, LP5521_REG_G_PWM, 0);
265 ret |= lp5521_write(client, LP5521_REG_B_PWM, 0);
266
267 /* Set engines are set to run state when OP_MODE enables engines */
268 ret |= lp5521_write(client, LP5521_REG_ENABLE,
269 LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM |
270 LP5521_EXEC_RUN);
09c76b0f
SO		 271 /* enable takes 500us. 1 - 2 ms leaves some margin */
272 usleep_range(1000, 2000);
500fe141
SO		 273
274 return ret;
275}
276
277static int lp5521_run_selftest(struct lp5521_chip *chip, char *buf)
278{
279 int ret;
280 u8 status;
281
282 ret = lp5521_read(chip->client, LP5521_REG_STATUS, &status);
283 if (ret < 0)
284 return ret;
285
286 /* Check that ext clock is really in use if requested */
287 if (chip->pdata && chip->pdata->clock_mode == LP5521_CLOCK_EXT)
288 if ((status & LP5521_EXT_CLK_USED) == 0)
289 return -EIO;
290 return 0;
291}
292
293static void lp5521_set_brightness(struct led_classdev *cdev,
294 enum led_brightness brightness)
295{
296 struct lp5521_led *led = cdev_to_led(cdev);
297 led->brightness = (u8)brightness;
298 schedule_work(&led->brightness_work);
299}
300
301static void lp5521_led_brightness_work(struct work_struct *work)
302{
303 struct lp5521_led *led = container_of(work,
304 struct lp5521_led,
305 brightness_work);
306 struct lp5521_chip *chip = led_to_lp5521(led);
307 struct i2c_client *client = chip->client;
308
309 mutex_lock(&chip->lock);
310 lp5521_write(client, LP5521_REG_LED_PWM_BASE + led->chan_nr,
311 led->brightness);
312 mutex_unlock(&chip->lock);
313}
314
315/* Detect the chip by setting its ENABLE register and reading it back. */
316static int lp5521_detect(struct i2c_client *client)
317{
318 int ret;
319 u8 buf;
320
321 ret = lp5521_write(client, LP5521_REG_ENABLE,
322 LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM);
323 if (ret)
324 return ret;
09c76b0f
SO		 325 /* enable takes 500us. 1 - 2 ms leaves some margin */
326 usleep_range(1000, 2000);
500fe141
SO		 327 ret = lp5521_read(client, LP5521_REG_ENABLE, &buf);
328 if (ret)
329 return ret;
330 if (buf != (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM))
331 return -ENODEV;
332
333 return 0;
334}
335
336/* Set engine mode and create appropriate sysfs attributes, if required. */
337static int lp5521_set_mode(struct lp5521_engine *engine, u8 mode)
338{
339 struct lp5521_chip *chip = engine_to_lp5521(engine);
340 struct i2c_client *client = chip->client;
341 struct device *dev = &client->dev;
342 int ret = 0;
343
344 /* if in that mode already do nothing, except for run */
345 if (mode == engine->mode && mode != LP5521_CMD_RUN)
346 return 0;
347
348 if (mode == LP5521_CMD_RUN) {
349 ret = lp5521_set_engine_mode(engine, LP5521_CMD_RUN);
350 } else if (mode == LP5521_CMD_LOAD) {
351 lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED);
352 lp5521_set_engine_mode(engine, LP5521_CMD_LOAD);
353
354 ret = sysfs_create_group(&dev->kobj, engine->attributes);
355 if (ret)
356 return ret;
357 } else if (mode == LP5521_CMD_DISABLED) {
358 lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED);
359 }
360
361 /* remove load attribute from sysfs if not in load mode */
362 if (engine->mode == LP5521_CMD_LOAD && mode != LP5521_CMD_LOAD)
363 sysfs_remove_group(&dev->kobj, engine->attributes);
364
365 engine->mode = mode;
366
367 return ret;
368}
369
370static int lp5521_do_store_load(struct lp5521_engine *engine,
371 const char *buf, size_t len)
372{
373 struct lp5521_chip *chip = engine_to_lp5521(engine);
374 struct i2c_client *client = chip->client;
375 int ret, nrchars, offset = 0, i = 0;
376 char c[3];
377 unsigned cmd;
378 u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
379
380 while ((offset < len - 1) && (i < LP5521_PROGRAM_LENGTH)) {
381 /* separate sscanfs because length is working only for %s */
382 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
383 ret = sscanf(c, "%2x", &cmd);
384 if (ret != 1)
385 goto fail;
386 pattern[i] = (u8)cmd;
387
388 offset += nrchars;
389 i++;
390 }
391
392 /* Each instruction is 16bit long. Check that length is even */
393 if (i % 2)
394 goto fail;
395
396 mutex_lock(&chip->lock);
397 ret = lp5521_load_program(engine, pattern);
398 mutex_unlock(&chip->lock);
399
400 if (ret) {
401 dev_err(&client->dev, "failed loading pattern\n");
402 return ret;
403 }
404
405 return len;
406fail:
407 dev_err(&client->dev, "wrong pattern format\n");
408 return -EINVAL;
409}
410
411static ssize_t store_engine_load(struct device *dev,
412 struct device_attribute *attr,
413 const char *buf, size_t len, int nr)
414{
415 struct i2c_client *client = to_i2c_client(dev);
416 struct lp5521_chip *chip = i2c_get_clientdata(client);
417 return lp5521_do_store_load(&chip->engines[nr - 1], buf, len);
418}
419
420#define store_load(nr) \
421static ssize_t store_engine##nr##_load(struct device *dev, \
422 struct device_attribute *attr, \
423 const char *buf, size_t len) \
424{ \
425 return store_engine_load(dev, attr, buf, len, nr); \
426}
427store_load(1)
428store_load(2)
429store_load(3)
430
431static ssize_t show_engine_mode(struct device *dev,
432 struct device_attribute *attr,
433 char *buf, int nr)
434{
435 struct i2c_client *client = to_i2c_client(dev);
436 struct lp5521_chip *chip = i2c_get_clientdata(client);
437 switch (chip->engines[nr - 1].mode) {
438 case LP5521_CMD_RUN:
439 return sprintf(buf, "run\n");
440 case LP5521_CMD_LOAD:
441 return sprintf(buf, "load\n");
442 case LP5521_CMD_DISABLED:
443 return sprintf(buf, "disabled\n");
444 default:
445 return sprintf(buf, "disabled\n");
446 }
447}
448
449#define show_mode(nr) \
450static ssize_t show_engine##nr##_mode(struct device *dev, \
451 struct device_attribute *attr, \
452 char *buf) \
453{ \
454 return show_engine_mode(dev, attr, buf, nr); \
455}
456show_mode(1)
457show_mode(2)
458show_mode(3)
459
460static ssize_t store_engine_mode(struct device *dev,
461 struct device_attribute *attr,
462 const char *buf, size_t len, int nr)
463{
464 struct i2c_client *client = to_i2c_client(dev);
465 struct lp5521_chip *chip = i2c_get_clientdata(client);
466 struct lp5521_engine *engine = &chip->engines[nr - 1];
467 mutex_lock(&chip->lock);
468
469 if (!strncmp(buf, "run", 3))
470 lp5521_set_mode(engine, LP5521_CMD_RUN);
471 else if (!strncmp(buf, "load", 4))
472 lp5521_set_mode(engine, LP5521_CMD_LOAD);
473 else if (!strncmp(buf, "disabled", 8))
474 lp5521_set_mode(engine, LP5521_CMD_DISABLED);
475
476 mutex_unlock(&chip->lock);
477 return len;
478}
479
480#define store_mode(nr) \
481static ssize_t store_engine##nr##_mode(struct device *dev, \
482 struct device_attribute *attr, \
483 const char *buf, size_t len) \
484{ \
485 return store_engine_mode(dev, attr, buf, len, nr); \
486}
487store_mode(1)
488store_mode(2)
489store_mode(3)
490
491static ssize_t show_max_current(struct device *dev,
492 struct device_attribute *attr,
493 char *buf)
494{
495 struct led_classdev *led_cdev = dev_get_drvdata(dev);
496 struct lp5521_led *led = cdev_to_led(led_cdev);
497
498 return sprintf(buf, "%d\n", led->max_current);
499}
500
501static ssize_t show_current(struct device *dev,
502 struct device_attribute *attr,
503 char *buf)
504{
505 struct led_classdev *led_cdev = dev_get_drvdata(dev);
506 struct lp5521_led *led = cdev_to_led(led_cdev);
507
508 return sprintf(buf, "%d\n", led->led_current);
509}
510
511static ssize_t store_current(struct device *dev,
512 struct device_attribute *attr,
513 const char *buf, size_t len)
514{
515 struct led_classdev *led_cdev = dev_get_drvdata(dev);
516 struct lp5521_led *led = cdev_to_led(led_cdev);
517 struct lp5521_chip *chip = led_to_lp5521(led);
518 ssize_t ret;
519 unsigned long curr;
520
521 if (strict_strtoul(buf, 0, &curr))
522 return -EINVAL;
523
524 if (curr > led->max_current)
525 return -EINVAL;
526
527 mutex_lock(&chip->lock);
528 ret = lp5521_set_led_current(chip, led->id, curr);
529 mutex_unlock(&chip->lock);
530
531 if (ret < 0)
532 return ret;
533
534 led->led_current = (u8)curr;
535
536 return len;
537}
538
539static ssize_t lp5521_selftest(struct device *dev,
540 struct device_attribute *attr,
541 char *buf)
542{
543 struct i2c_client *client = to_i2c_client(dev);
544 struct lp5521_chip *chip = i2c_get_clientdata(client);
545 int ret;
546
547 mutex_lock(&chip->lock);
548 ret = lp5521_run_selftest(chip, buf);
549 mutex_unlock(&chip->lock);
550 return sprintf(buf, "%s\n", ret ? "FAIL" : "OK");
551}
552
553/* led class device attributes */
554static DEVICE_ATTR(led_current, S_IRUGO | S_IWUGO, show_current, store_current);
555static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
556
557static struct attribute *lp5521_led_attributes[] = {
558 &dev_attr_led_current.attr,
559 &dev_attr_max_current.attr,
560 NULL,
561};
562
563static struct attribute_group lp5521_led_attribute_group = {
564 .attrs = lp5521_led_attributes
565};
566
567/* device attributes */
568static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUGO,
569 show_engine1_mode, store_engine1_mode);
570static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUGO,
571 show_engine2_mode, store_engine2_mode);
572static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUGO,
573 show_engine3_mode, store_engine3_mode);
574static DEVICE_ATTR(engine1_load, S_IWUGO, NULL, store_engine1_load);
575static DEVICE_ATTR(engine2_load, S_IWUGO, NULL, store_engine2_load);
576static DEVICE_ATTR(engine3_load, S_IWUGO, NULL, store_engine3_load);
577static DEVICE_ATTR(selftest, S_IRUGO, lp5521_selftest, NULL);
578
579static struct attribute *lp5521_attributes[] = {
580 &dev_attr_engine1_mode.attr,
581 &dev_attr_engine2_mode.attr,
582 &dev_attr_engine3_mode.attr,
583 &dev_attr_selftest.attr,
584 NULL
585};
586
587static struct attribute *lp5521_engine1_attributes[] = {
588 &dev_attr_engine1_load.attr,
589 NULL
590};
591
592static struct attribute *lp5521_engine2_attributes[] = {
593 &dev_attr_engine2_load.attr,
594 NULL
595};
596
597static struct attribute *lp5521_engine3_attributes[] = {
598 &dev_attr_engine3_load.attr,
599 NULL
600};
601
602static const struct attribute_group lp5521_group = {
603 .attrs = lp5521_attributes,
604};
605
606static const struct attribute_group lp5521_engine_group[] = {
607 {.attrs = lp5521_engine1_attributes },
608 {.attrs = lp5521_engine2_attributes },
609 {.attrs = lp5521_engine3_attributes },
610};
611
612static int lp5521_register_sysfs(struct i2c_client *client)
613{
614 struct device *dev = &client->dev;
615 return sysfs_create_group(&dev->kobj, &lp5521_group);
616}
617
618static void lp5521_unregister_sysfs(struct i2c_client *client)
619{
620 struct lp5521_chip *chip = i2c_get_clientdata(client);
621 struct device *dev = &client->dev;
622 int i;
623
624 sysfs_remove_group(&dev->kobj, &lp5521_group);
625
626 for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
627 if (chip->engines[i].mode == LP5521_CMD_LOAD)
628 sysfs_remove_group(&dev->kobj,
629 chip->engines[i].attributes);
630 }
631
632 for (i = 0; i < chip->num_leds; i++)
633 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
634 &lp5521_led_attribute_group);
635}
636
637static int __init lp5521_init_led(struct lp5521_led *led,
638 struct i2c_client *client,
639 int chan, struct lp5521_platform_data *pdata)
640{
641 struct device *dev = &client->dev;
642 char name[32];
643 int res;
644
645 if (chan >= LP5521_MAX_LEDS)
646 return -EINVAL;
647
648 if (pdata->led_config[chan].led_current == 0)
649 return 0;
650
651 led->led_current = pdata->led_config[chan].led_current;
652 led->max_current = pdata->led_config[chan].max_current;
653 led->chan_nr = pdata->led_config[chan].chan_nr;
654
655 if (led->chan_nr >= LP5521_MAX_LEDS) {
656 dev_err(dev, "Use channel numbers between 0 and %d\n",
657 LP5521_MAX_LEDS - 1);
658 return -EINVAL;
659 }
660
661 snprintf(name, sizeof(name), "%s:channel%d", client->name, chan);
662 led->cdev.brightness_set = lp5521_set_brightness;
663 led->cdev.name = name;
664 res = led_classdev_register(dev, &led->cdev);
665 if (res < 0) {
666 dev_err(dev, "couldn't register led on channel %d\n", chan);
667 return res;
668 }
669
670 res = sysfs_create_group(&led->cdev.dev->kobj,
671 &lp5521_led_attribute_group);
672 if (res < 0) {
673 dev_err(dev, "couldn't register current attribute\n");
674 led_classdev_unregister(&led->cdev);
675 return res;
676 }
677 return 0;
678}
679
680static int lp5521_probe(struct i2c_client *client,
681 const struct i2c_device_id *id)
682{
683 struct lp5521_chip *chip;
684 struct lp5521_platform_data *pdata;
685 int ret, i, led;
686
687 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
688 if (!chip)
689 return -ENOMEM;
690
691 i2c_set_clientdata(client, chip);
692 chip->client = client;
693
694 pdata = client->dev.platform_data;
695
696 if (!pdata) {
697 dev_err(&client->dev, "no platform data\n");
698 ret = -EINVAL;
699 goto fail1;
700 }
701
702 mutex_init(&chip->lock);
703
704 chip->pdata = pdata;
705
706 if (pdata->setup_resources) {
707 ret = pdata->setup_resources();
708 if (ret < 0)
709 goto fail1;
710 }
711
712 if (pdata->enable) {
713 pdata->enable(0);
09c76b0f 714 usleep_range(1000, 2000); /* Keep enable down at least 1ms */
500fe141 715 pdata->enable(1);
09c76b0f 716 usleep_range(1000, 2000); /* 500us abs min. */
500fe141
SO		 717 }
718
719 ret = lp5521_detect(client);
720
721 if (ret) {
722 dev_err(&client->dev, "Chip not found\n");
723 goto fail2;
724 }
725
726 dev_info(&client->dev, "%s programmable led chip found\n", id->name);
727
728 ret = lp5521_configure(client, lp5521_engine_group);
729 if (ret < 0) {
730 dev_err(&client->dev, "error configuring chip\n");
731 goto fail2;
732 }
733
734 /* Initialize leds */
735 chip->num_channels = pdata->num_channels;
736 chip->num_leds = 0;
737 led = 0;
738 for (i = 0; i < pdata->num_channels; i++) {
739 /* Do not initialize channels that are not connected */
740 if (pdata->led_config[i].led_current == 0)
741 continue;
742
743 ret = lp5521_init_led(&chip->leds[led], client, i, pdata);
744 if (ret) {
745 dev_err(&client->dev, "error initializing leds\n");
746 goto fail3;
747 }
748 chip->num_leds++;
749
750 chip->leds[led].id = led;
751 /* Set initial LED current */
752 lp5521_set_led_current(chip, led,
753 chip->leds[led].led_current);
754
755 INIT_WORK(&(chip->leds[led].brightness_work),
756 lp5521_led_brightness_work);
757
758 led++;
759 }
760
761 ret = lp5521_register_sysfs(client);
762 if (ret) {
763 dev_err(&client->dev, "registering sysfs failed\n");
764 goto fail3;
765 }
766 return ret;
767fail3:
768 for (i = 0; i < chip->num_leds; i++) {
769 led_classdev_unregister(&chip->leds[i].cdev);
770 cancel_work_sync(&chip->leds[i].brightness_work);
771 }
772fail2:
773 if (pdata->enable)
774 pdata->enable(0);
775 if (pdata->release_resources)
776 pdata->release_resources();
777fail1:
778 kfree(chip);
779 return ret;
780}
781
782static int lp5521_remove(struct i2c_client *client)
783{
784 struct lp5521_chip *chip = i2c_get_clientdata(client);
785 int i;
786
787 lp5521_unregister_sysfs(client);
788
789 for (i = 0; i < chip->num_leds; i++) {
790 led_classdev_unregister(&chip->leds[i].cdev);
791 cancel_work_sync(&chip->leds[i].brightness_work);
792 }
793
794 if (chip->pdata->enable)
795 chip->pdata->enable(0);
796 if (chip->pdata->release_resources)
797 chip->pdata->release_resources();
798 kfree(chip);
799 return 0;
800}
801
802static const struct i2c_device_id lp5521_id[] = {
803 { "lp5521", 0 }, /* Three channel chip */
804 { }
805};
806MODULE_DEVICE_TABLE(i2c, lp5521_id);
807
808static struct i2c_driver lp5521_driver = {
809 .driver = {
810 .name = "lp5521",
811 },
812 .probe = lp5521_probe,
813 .remove = lp5521_remove,
814 .id_table = lp5521_id,
815};
816
817static int __init lp5521_init(void)
818{
819 int ret;
820
821 ret = i2c_add_driver(&lp5521_driver);
822
823 if (ret < 0)
824 printk(KERN_ALERT "Adding lp5521 driver failed\n");
825
826 return ret;
827}
828
829static void __exit lp5521_exit(void)
830{
831 i2c_del_driver(&lp5521_driver);
832}
833
834module_init(lp5521_init);
835module_exit(lp5521_exit);
836
837MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
838MODULE_DESCRIPTION("LP5521 LED engine");
839MODULE_LICENSE("GPL v2");
kernel source for telekom puls (alcatel/mediatek)