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drivers/leds/leds-lp5521.c: add 'name' in the lp5521_led_config
[deliverable/linux.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
b3c49c05
SK		 100/* default R channel current register value */
101#define LP5521_REG_R_CURR_DEFAULT 0xAF
102
500fe141 103struct lp5521_engine {
500fe141
SO		 104 int id;
105 u8 mode;
106 u8 prog_page;
107 u8 engine_mask;
108};
109
110struct lp5521_led {
111 int id;
112 u8 chan_nr;
113 u8 led_current;
114 u8 max_current;
115 struct led_classdev cdev;
116 struct work_struct brightness_work;
117 u8 brightness;
118};
119
120struct lp5521_chip {
121 struct lp5521_platform_data *pdata;
122 struct mutex lock; /* Serialize control */
123 struct i2c_client *client;
124 struct lp5521_engine engines[LP5521_MAX_ENGINES];
125 struct lp5521_led leds[LP5521_MAX_LEDS];
126 u8 num_channels;
127 u8 num_leds;
128};
129
9fdb18b6
SO		 130static inline struct lp5521_led *cdev_to_led(struct led_classdev *cdev)
131{
132 return container_of(cdev, struct lp5521_led, cdev);
133}
134
135static inline struct lp5521_chip *engine_to_lp5521(struct lp5521_engine *engine)
136{
137 return container_of(engine, struct lp5521_chip,
138 engines[engine->id - 1]);
139}
140
141static inline struct lp5521_chip *led_to_lp5521(struct lp5521_led *led)
142{
143 return container_of(led, struct lp5521_chip,
144 leds[led->id]);
145}
500fe141
SO		 146
147static void lp5521_led_brightness_work(struct work_struct *work);
148
149static inline int lp5521_write(struct i2c_client *client, u8 reg, u8 value)
150{
151 return i2c_smbus_write_byte_data(client, reg, value);
152}
153
154static int lp5521_read(struct i2c_client *client, u8 reg, u8 *buf)
155{
156 s32 ret;
157
158 ret = i2c_smbus_read_byte_data(client, reg);
159 if (ret < 0)
160 return -EIO;
161
162 *buf = ret;
163 return 0;
164}
165
166static int lp5521_set_engine_mode(struct lp5521_engine *engine, u8 mode)
167{
168 struct lp5521_chip *chip = engine_to_lp5521(engine);
169 struct i2c_client *client = chip->client;
170 int ret;
171 u8 engine_state;
172
173 /* Only transition between RUN and DIRECT mode are handled here */
174 if (mode == LP5521_CMD_LOAD)
175 return 0;
176
177 if (mode == LP5521_CMD_DISABLED)
178 mode = LP5521_CMD_DIRECT;
179
180 ret = lp5521_read(client, LP5521_REG_OP_MODE, &engine_state);
fa0ea0e1
AL		 181 if (ret < 0)
182 return ret;
500fe141
SO		 183
184 /* set mode only for this engine */
185 engine_state &= ~(engine->engine_mask);
186 mode &= engine->engine_mask;
187 engine_state |= mode;
fa0ea0e1 188 return lp5521_write(client, LP5521_REG_OP_MODE, engine_state);
500fe141
SO		 189}
190
191static int lp5521_load_program(struct lp5521_engine *eng, const u8 *pattern)
192{
193 struct lp5521_chip *chip = engine_to_lp5521(eng);
194 struct i2c_client *client = chip->client;
195 int ret;
196 int addr;
197 u8 mode;
198
199 /* move current engine to direct mode and remember the state */
200 ret = lp5521_set_engine_mode(eng, LP5521_CMD_DIRECT);
09c76b0f
SO		 201 /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
202 usleep_range(1000, 2000);
500fe141
SO		 203 ret |= lp5521_read(client, LP5521_REG_OP_MODE, &mode);
204
205 /* For loading, all the engines to load mode */
206 lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
09c76b0f
SO		 207 /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
208 usleep_range(1000, 2000);
500fe141 209 lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_LOAD);
09c76b0f
SO		 210 /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
211 usleep_range(1000, 2000);
500fe141
SO		 212
213 addr = LP5521_PROG_MEM_BASE + eng->prog_page * LP5521_PROG_MEM_SIZE;
214 i2c_smbus_write_i2c_block_data(client,
215 addr,
216 LP5521_PROG_MEM_SIZE,
217 pattern);
218
219 ret |= lp5521_write(client, LP5521_REG_OP_MODE, mode);
220 return ret;
221}
222
223static int lp5521_set_led_current(struct lp5521_chip *chip, int led, u8 curr)
224{
225 return lp5521_write(chip->client,
226 LP5521_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
227 curr);
228}
229
d4e7ad03 230static void lp5521_init_engine(struct lp5521_chip *chip)
500fe141
SO		 231{
232 int i;
233 for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
234 chip->engines[i].id = i + 1;
235 chip->engines[i].engine_mask = LP5521_ENG_MASK_BASE >> (i * 2);
236 chip->engines[i].prog_page = i;
500fe141
SO		 237 }
238}
239
d4e7ad03 240static int lp5521_configure(struct i2c_client *client)
500fe141
SO		 241{
242 struct lp5521_chip *chip = i2c_get_clientdata(client);
243 int ret;
244
d4e7ad03 245 lp5521_init_engine(chip);
500fe141 246
500fe141
SO		 247 /* Set all PWMs to direct control mode */
248 ret = lp5521_write(client, LP5521_REG_OP_MODE, 0x3F);
249
250 /* Enable auto-powersave, set charge pump to auto, red to battery */
251 ret |= lp5521_write(client, LP5521_REG_CONFIG,
252 LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO | LP5521_R_TO_BATT);
253
254 /* Initialize all channels PWM to zero -> leds off */
255 ret |= lp5521_write(client, LP5521_REG_R_PWM, 0);
256 ret |= lp5521_write(client, LP5521_REG_G_PWM, 0);
257 ret |= lp5521_write(client, LP5521_REG_B_PWM, 0);
258
259 /* Set engines are set to run state when OP_MODE enables engines */
260 ret |= lp5521_write(client, LP5521_REG_ENABLE,
261 LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM |
262 LP5521_EXEC_RUN);
09c76b0f
SO		 263 /* enable takes 500us. 1 - 2 ms leaves some margin */
264 usleep_range(1000, 2000);
500fe141
SO		 265
266 return ret;
267}
268
269static int lp5521_run_selftest(struct lp5521_chip *chip, char *buf)
270{
271 int ret;
272 u8 status;
273
274 ret = lp5521_read(chip->client, LP5521_REG_STATUS, &status);
275 if (ret < 0)
276 return ret;
277
278 /* Check that ext clock is really in use if requested */
279 if (chip->pdata && chip->pdata->clock_mode == LP5521_CLOCK_EXT)
280 if ((status & LP5521_EXT_CLK_USED) == 0)
281 return -EIO;
282 return 0;
283}
284
285static void lp5521_set_brightness(struct led_classdev *cdev,
286 enum led_brightness brightness)
287{
288 struct lp5521_led *led = cdev_to_led(cdev);
289 led->brightness = (u8)brightness;
290 schedule_work(&led->brightness_work);
291}
292
293static void lp5521_led_brightness_work(struct work_struct *work)
294{
295 struct lp5521_led *led = container_of(work,
296 struct lp5521_led,
297 brightness_work);
298 struct lp5521_chip *chip = led_to_lp5521(led);
299 struct i2c_client *client = chip->client;
300
301 mutex_lock(&chip->lock);
302 lp5521_write(client, LP5521_REG_LED_PWM_BASE + led->chan_nr,
303 led->brightness);
304 mutex_unlock(&chip->lock);
305}
306
307/* Detect the chip by setting its ENABLE register and reading it back. */
308static int lp5521_detect(struct i2c_client *client)
309{
310 int ret;
311 u8 buf;
312
313 ret = lp5521_write(client, LP5521_REG_ENABLE,
314 LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM);
315 if (ret)
316 return ret;
09c76b0f
SO		 317 /* enable takes 500us. 1 - 2 ms leaves some margin */
318 usleep_range(1000, 2000);
500fe141
SO		 319 ret = lp5521_read(client, LP5521_REG_ENABLE, &buf);
320 if (ret)
321 return ret;
322 if (buf != (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM))
323 return -ENODEV;
324
325 return 0;
326}
327
328/* Set engine mode and create appropriate sysfs attributes, if required. */
329static int lp5521_set_mode(struct lp5521_engine *engine, u8 mode)
330{
500fe141
SO		 331 int ret = 0;
332
333 /* if in that mode already do nothing, except for run */
334 if (mode == engine->mode && mode != LP5521_CMD_RUN)
335 return 0;
336
337 if (mode == LP5521_CMD_RUN) {
338 ret = lp5521_set_engine_mode(engine, LP5521_CMD_RUN);
339 } else if (mode == LP5521_CMD_LOAD) {
340 lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED);
341 lp5521_set_engine_mode(engine, LP5521_CMD_LOAD);
500fe141
SO		 342 } else if (mode == LP5521_CMD_DISABLED) {
343 lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED);
344 }
345
500fe141
SO		 346 engine->mode = mode;
347
348 return ret;
349}
350
351static int lp5521_do_store_load(struct lp5521_engine *engine,
352 const char *buf, size_t len)
353{
354 struct lp5521_chip *chip = engine_to_lp5521(engine);
355 struct i2c_client *client = chip->client;
356 int ret, nrchars, offset = 0, i = 0;
357 char c[3];
358 unsigned cmd;
359 u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
360
361 while ((offset < len - 1) && (i < LP5521_PROGRAM_LENGTH)) {
362 /* separate sscanfs because length is working only for %s */
363 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
2260209c
VK		 364 if (ret != 2)
365 goto fail;
500fe141
SO		 366 ret = sscanf(c, "%2x", &cmd);
367 if (ret != 1)
368 goto fail;
369 pattern[i] = (u8)cmd;
370
371 offset += nrchars;
372 i++;
373 }
374
375 /* Each instruction is 16bit long. Check that length is even */
376 if (i % 2)
377 goto fail;
378
379 mutex_lock(&chip->lock);
d4e7ad03
SO		 380 if (engine->mode == LP5521_CMD_LOAD)
381 ret = lp5521_load_program(engine, pattern);
382 else
383 ret = -EINVAL;
500fe141
SO		 384 mutex_unlock(&chip->lock);
385
386 if (ret) {
387 dev_err(&client->dev, "failed loading pattern\n");
388 return ret;
389 }
390
391 return len;
392fail:
393 dev_err(&client->dev, "wrong pattern format\n");
394 return -EINVAL;
395}
396
397static ssize_t store_engine_load(struct device *dev,
398 struct device_attribute *attr,
399 const char *buf, size_t len, int nr)
400{
401 struct i2c_client *client = to_i2c_client(dev);
402 struct lp5521_chip *chip = i2c_get_clientdata(client);
403 return lp5521_do_store_load(&chip->engines[nr - 1], buf, len);
404}
405
406#define store_load(nr) \
407static ssize_t store_engine##nr##_load(struct device *dev, \
408 struct device_attribute *attr, \
409 const char *buf, size_t len) \
410{ \
411 return store_engine_load(dev, attr, buf, len, nr); \
412}
413store_load(1)
414store_load(2)
415store_load(3)
416
417static ssize_t show_engine_mode(struct device *dev,
418 struct device_attribute *attr,
419 char *buf, int nr)
420{
421 struct i2c_client *client = to_i2c_client(dev);
422 struct lp5521_chip *chip = i2c_get_clientdata(client);
423 switch (chip->engines[nr - 1].mode) {
424 case LP5521_CMD_RUN:
425 return sprintf(buf, "run\n");
426 case LP5521_CMD_LOAD:
427 return sprintf(buf, "load\n");
428 case LP5521_CMD_DISABLED:
429 return sprintf(buf, "disabled\n");
430 default:
431 return sprintf(buf, "disabled\n");
432 }
433}
434
435#define show_mode(nr) \
436static ssize_t show_engine##nr##_mode(struct device *dev, \
437 struct device_attribute *attr, \
438 char *buf) \
439{ \
440 return show_engine_mode(dev, attr, buf, nr); \
441}
442show_mode(1)
443show_mode(2)
444show_mode(3)
445
446static ssize_t store_engine_mode(struct device *dev,
447 struct device_attribute *attr,
448 const char *buf, size_t len, int nr)
449{
450 struct i2c_client *client = to_i2c_client(dev);
451 struct lp5521_chip *chip = i2c_get_clientdata(client);
452 struct lp5521_engine *engine = &chip->engines[nr - 1];
453 mutex_lock(&chip->lock);
454
455 if (!strncmp(buf, "run", 3))
456 lp5521_set_mode(engine, LP5521_CMD_RUN);
457 else if (!strncmp(buf, "load", 4))
458 lp5521_set_mode(engine, LP5521_CMD_LOAD);
459 else if (!strncmp(buf, "disabled", 8))
460 lp5521_set_mode(engine, LP5521_CMD_DISABLED);
461
462 mutex_unlock(&chip->lock);
463 return len;
464}
465
466#define store_mode(nr) \
467static ssize_t store_engine##nr##_mode(struct device *dev, \
468 struct device_attribute *attr, \
469 const char *buf, size_t len) \
470{ \
471 return store_engine_mode(dev, attr, buf, len, nr); \
472}
473store_mode(1)
474store_mode(2)
475store_mode(3)
476
477static ssize_t show_max_current(struct device *dev,
478 struct device_attribute *attr,
479 char *buf)
480{
481 struct led_classdev *led_cdev = dev_get_drvdata(dev);
482 struct lp5521_led *led = cdev_to_led(led_cdev);
483
484 return sprintf(buf, "%d\n", led->max_current);
485}
486
487static ssize_t show_current(struct device *dev,
488 struct device_attribute *attr,
489 char *buf)
490{
491 struct led_classdev *led_cdev = dev_get_drvdata(dev);
492 struct lp5521_led *led = cdev_to_led(led_cdev);
493
494 return sprintf(buf, "%d\n", led->led_current);
495}
496
497static ssize_t store_current(struct device *dev,
498 struct device_attribute *attr,
499 const char *buf, size_t len)
500{
501 struct led_classdev *led_cdev = dev_get_drvdata(dev);
502 struct lp5521_led *led = cdev_to_led(led_cdev);
503 struct lp5521_chip *chip = led_to_lp5521(led);
504 ssize_t ret;
505 unsigned long curr;
506
507 if (strict_strtoul(buf, 0, &curr))
508 return -EINVAL;
509
510 if (curr > led->max_current)
511 return -EINVAL;
512
513 mutex_lock(&chip->lock);
514 ret = lp5521_set_led_current(chip, led->id, curr);
515 mutex_unlock(&chip->lock);
516
517 if (ret < 0)
518 return ret;
519
520 led->led_current = (u8)curr;
521
522 return len;
523}
524
525static ssize_t lp5521_selftest(struct device *dev,
526 struct device_attribute *attr,
527 char *buf)
528{
529 struct i2c_client *client = to_i2c_client(dev);
530 struct lp5521_chip *chip = i2c_get_clientdata(client);
531 int ret;
532
533 mutex_lock(&chip->lock);
534 ret = lp5521_run_selftest(chip, buf);
535 mutex_unlock(&chip->lock);
536 return sprintf(buf, "%s\n", ret ? "FAIL" : "OK");
537}
538
539/* led class device attributes */
67d1da79 540static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current);
500fe141
SO		 541static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
542
543static struct attribute *lp5521_led_attributes[] = {
544 &dev_attr_led_current.attr,
545 &dev_attr_max_current.attr,
546 NULL,
547};
548
549static struct attribute_group lp5521_led_attribute_group = {
550 .attrs = lp5521_led_attributes
551};
552
553/* device attributes */
67d1da79 554static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR,
500fe141 555 show_engine1_mode, store_engine1_mode);
67d1da79 556static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR,
500fe141 557 show_engine2_mode, store_engine2_mode);
67d1da79 558static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR,
500fe141 559 show_engine3_mode, store_engine3_mode);
67d1da79
VK		 560static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load);
561static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load);
562static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load);
500fe141
SO		 563static DEVICE_ATTR(selftest, S_IRUGO, lp5521_selftest, NULL);
564
565static struct attribute *lp5521_attributes[] = {
566 &dev_attr_engine1_mode.attr,
567 &dev_attr_engine2_mode.attr,
568 &dev_attr_engine3_mode.attr,
569 &dev_attr_selftest.attr,
500fe141 570 &dev_attr_engine1_load.attr,
500fe141 571 &dev_attr_engine2_load.attr,
500fe141
SO		 572 &dev_attr_engine3_load.attr,
573 NULL
574};
575
576static const struct attribute_group lp5521_group = {
577 .attrs = lp5521_attributes,
578};
579
500fe141
SO		 580static int lp5521_register_sysfs(struct i2c_client *client)
581{
582 struct device *dev = &client->dev;
583 return sysfs_create_group(&dev->kobj, &lp5521_group);
584}
585
586static void lp5521_unregister_sysfs(struct i2c_client *client)
587{
588 struct lp5521_chip *chip = i2c_get_clientdata(client);
589 struct device *dev = &client->dev;
590 int i;
591
592 sysfs_remove_group(&dev->kobj, &lp5521_group);
593
500fe141
SO		 594 for (i = 0; i < chip->num_leds; i++)
595 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
596 &lp5521_led_attribute_group);
597}
598
5286bd95 599static int __devinit lp5521_init_led(struct lp5521_led *led,
500fe141
SO		 600 struct i2c_client *client,
601 int chan, struct lp5521_platform_data *pdata)
602{
603 struct device *dev = &client->dev;
604 char name[32];
605 int res;
606
607 if (chan >= LP5521_MAX_LEDS)
608 return -EINVAL;
609
610 if (pdata->led_config[chan].led_current == 0)
611 return 0;
612
613 led->led_current = pdata->led_config[chan].led_current;
614 led->max_current = pdata->led_config[chan].max_current;
615 led->chan_nr = pdata->led_config[chan].chan_nr;
616
617 if (led->chan_nr >= LP5521_MAX_LEDS) {
618 dev_err(dev, "Use channel numbers between 0 and %d\n",
619 LP5521_MAX_LEDS - 1);
620 return -EINVAL;
621 }
622
500fe141 623 led->cdev.brightness_set = lp5521_set_brightness;
5ae4e8a7
KM		 624 if (pdata->led_config[chan].name) {
625 led->cdev.name = pdata->led_config[chan].name;
626 } else {
627 snprintf(name, sizeof(name), "%s:channel%d",
628 pdata->label ?: client->name, chan);
629 led->cdev.name = name;
630 }
631
500fe141
SO		 632 res = led_classdev_register(dev, &led->cdev);
633 if (res < 0) {
634 dev_err(dev, "couldn't register led on channel %d\n", chan);
635 return res;
636 }
637
638 res = sysfs_create_group(&led->cdev.dev->kobj,
639 &lp5521_led_attribute_group);
640 if (res < 0) {
641 dev_err(dev, "couldn't register current attribute\n");
642 led_classdev_unregister(&led->cdev);
643 return res;
644 }
645 return 0;
646}
647
5286bd95 648static int __devinit lp5521_probe(struct i2c_client *client,
500fe141
SO		 649 const struct i2c_device_id *id)
650{
651 struct lp5521_chip *chip;
652 struct lp5521_platform_data *pdata;
653 int ret, i, led;
b3c49c05 654 u8 buf;
500fe141
SO		 655
656 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
657 if (!chip)
658 return -ENOMEM;
659
660 i2c_set_clientdata(client, chip);
661 chip->client = client;
662
663 pdata = client->dev.platform_data;
664
665 if (!pdata) {
666 dev_err(&client->dev, "no platform data\n");
667 ret = -EINVAL;
668 goto fail1;
669 }
670
671 mutex_init(&chip->lock);
672
673 chip->pdata = pdata;
674
675 if (pdata->setup_resources) {
676 ret = pdata->setup_resources();
677 if (ret < 0)
678 goto fail1;
679 }
680
681 if (pdata->enable) {
682 pdata->enable(0);
09c76b0f 683 usleep_range(1000, 2000); /* Keep enable down at least 1ms */
500fe141 684 pdata->enable(1);
09c76b0f 685 usleep_range(1000, 2000); /* 500us abs min. */
500fe141
SO		 686 }
687
95ea8eec
SO		 688 lp5521_write(client, LP5521_REG_RESET, 0xff);
689 usleep_range(10000, 20000); /*
690 * Exact value is not available. 10 - 20ms
691 * appears to be enough for reset.
692 */
b3c49c05
SK		 693
694 /*
695 * Make sure that the chip is reset by reading back the r channel
696 * current reg. This is dummy read is required on some platforms -
697 * otherwise further access to the R G B channels in the
698 * LP5521_REG_ENABLE register will not have any effect - strange!
699 */
700 lp5521_read(client, LP5521_REG_R_CURRENT, &buf);
701 if (buf != LP5521_REG_R_CURR_DEFAULT) {
3a2fd4a1 702 dev_err(&client->dev, "error in resetting chip\n");
b3c49c05
SK		 703 goto fail2;
704 }
705 usleep_range(10000, 20000);
706
500fe141
SO		 707 ret = lp5521_detect(client);
708
709 if (ret) {
710 dev_err(&client->dev, "Chip not found\n");
711 goto fail2;
712 }
713
714 dev_info(&client->dev, "%s programmable led chip found\n", id->name);
715
d4e7ad03 716 ret = lp5521_configure(client);
500fe141
SO		 717 if (ret < 0) {
718 dev_err(&client->dev, "error configuring chip\n");
719 goto fail2;
720 }
721
722 /* Initialize leds */
723 chip->num_channels = pdata->num_channels;
724 chip->num_leds = 0;
725 led = 0;
726 for (i = 0; i < pdata->num_channels; i++) {
727 /* Do not initialize channels that are not connected */
728 if (pdata->led_config[i].led_current == 0)
729 continue;
730
731 ret = lp5521_init_led(&chip->leds[led], client, i, pdata);
732 if (ret) {
733 dev_err(&client->dev, "error initializing leds\n");
734 goto fail3;
735 }
736 chip->num_leds++;
737
738 chip->leds[led].id = led;
739 /* Set initial LED current */
740 lp5521_set_led_current(chip, led,
741 chip->leds[led].led_current);
742
743 INIT_WORK(&(chip->leds[led].brightness_work),
744 lp5521_led_brightness_work);
745
746 led++;
747 }
748
749 ret = lp5521_register_sysfs(client);
750 if (ret) {
751 dev_err(&client->dev, "registering sysfs failed\n");
752 goto fail3;
753 }
754 return ret;
755fail3:
756 for (i = 0; i < chip->num_leds; i++) {
757 led_classdev_unregister(&chip->leds[i].cdev);
758 cancel_work_sync(&chip->leds[i].brightness_work);
759 }
760fail2:
761 if (pdata->enable)
762 pdata->enable(0);
763 if (pdata->release_resources)
764 pdata->release_resources();
765fail1:
766 kfree(chip);
767 return ret;
768}
769
19ab5cb8 770static int __devexit lp5521_remove(struct i2c_client *client)
500fe141
SO		 771{
772 struct lp5521_chip *chip = i2c_get_clientdata(client);
773 int i;
774
775 lp5521_unregister_sysfs(client);
776
777 for (i = 0; i < chip->num_leds; i++) {
778 led_classdev_unregister(&chip->leds[i].cdev);
779 cancel_work_sync(&chip->leds[i].brightness_work);
780 }
781
782 if (chip->pdata->enable)
783 chip->pdata->enable(0);
784 if (chip->pdata->release_resources)
785 chip->pdata->release_resources();
786 kfree(chip);
787 return 0;
788}
789
790static const struct i2c_device_id lp5521_id[] = {
791 { "lp5521", 0 }, /* Three channel chip */
792 { }
793};
794MODULE_DEVICE_TABLE(i2c, lp5521_id);
795
796static struct i2c_driver lp5521_driver = {
797 .driver = {
798 .name = "lp5521",
799 },
800 .probe = lp5521_probe,
19ab5cb8 801 .remove = __devexit_p(lp5521_remove),
500fe141
SO		 802 .id_table = lp5521_id,
803};
804
09a0d183 805module_i2c_driver(lp5521_driver);
500fe141
SO		 806
807MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
808MODULE_DESCRIPTION("LP5521 LED engine");
809MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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