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leds: driver for National Semiconductor LP5521 chip
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / leds / leds-lp5521.c
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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
128#define cdev_to_led(c) container_of(c, struct lp5521_led, cdev)
129#define engine_to_lp5521(eng) container_of((eng), struct lp5521_chip, \
130 engines[(eng)->id - 1])
131#define led_to_lp5521(led) container_of((led), struct lp5521_chip, \
132 leds[(led)->id])
133
134static void lp5521_led_brightness_work(struct work_struct *work);
135
136static inline int lp5521_write(struct i2c_client *client, u8 reg, u8 value)
137{
138 return i2c_smbus_write_byte_data(client, reg, value);
139}
140
141static int lp5521_read(struct i2c_client *client, u8 reg, u8 *buf)
142{
143 s32 ret;
144
145 ret = i2c_smbus_read_byte_data(client, reg);
146 if (ret < 0)
147 return -EIO;
148
149 *buf = ret;
150 return 0;
151}
152
153static int lp5521_set_engine_mode(struct lp5521_engine *engine, u8 mode)
154{
155 struct lp5521_chip *chip = engine_to_lp5521(engine);
156 struct i2c_client *client = chip->client;
157 int ret;
158 u8 engine_state;
159
160 /* Only transition between RUN and DIRECT mode are handled here */
161 if (mode == LP5521_CMD_LOAD)
162 return 0;
163
164 if (mode == LP5521_CMD_DISABLED)
165 mode = LP5521_CMD_DIRECT;
166
167 ret = lp5521_read(client, LP5521_REG_OP_MODE, &engine_state);
168
169 /* set mode only for this engine */
170 engine_state &= ~(engine->engine_mask);
171 mode &= engine->engine_mask;
172 engine_state |= mode;
173 ret |= lp5521_write(client, LP5521_REG_OP_MODE, engine_state);
174
175 return ret;
176}
177
178static int lp5521_load_program(struct lp5521_engine *eng, const u8 *pattern)
179{
180 struct lp5521_chip *chip = engine_to_lp5521(eng);
181 struct i2c_client *client = chip->client;
182 int ret;
183 int addr;
184 u8 mode;
185
186 /* move current engine to direct mode and remember the state */
187 ret = lp5521_set_engine_mode(eng, LP5521_CMD_DIRECT);
188 usleep_range(1000, 10000);
189 ret |= lp5521_read(client, LP5521_REG_OP_MODE, &mode);
190
191 /* For loading, all the engines to load mode */
192 lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
193 usleep_range(1000, 10000);
194 lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_LOAD);
195 usleep_range(1000, 10000);
196
197 addr = LP5521_PROG_MEM_BASE + eng->prog_page * LP5521_PROG_MEM_SIZE;
198 i2c_smbus_write_i2c_block_data(client,
199 addr,
200 LP5521_PROG_MEM_SIZE,
201 pattern);
202
203 ret |= lp5521_write(client, LP5521_REG_OP_MODE, mode);
204 return ret;
205}
206
207static int lp5521_set_led_current(struct lp5521_chip *chip, int led, u8 curr)
208{
209 return lp5521_write(chip->client,
210 LP5521_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
211 curr);
212}
213
214static void lp5521_init_engine(struct lp5521_chip *chip,
215 const struct attribute_group *attr_group)
216{
217 int i;
218 for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
219 chip->engines[i].id = i + 1;
220 chip->engines[i].engine_mask = LP5521_ENG_MASK_BASE >> (i * 2);
221 chip->engines[i].prog_page = i;
222 chip->engines[i].attributes = &attr_group[i];
223 }
224}
225
226static int lp5521_configure(struct i2c_client *client,
227 const struct attribute_group *attr_group)
228{
229 struct lp5521_chip *chip = i2c_get_clientdata(client);
230 int ret;
231
232 lp5521_init_engine(chip, attr_group);
233
234 lp5521_write(client, LP5521_REG_RESET, 0xff);
235
236 usleep_range(10000, 20000);
237
238 /* Set all PWMs to direct control mode */
239 ret = lp5521_write(client, LP5521_REG_OP_MODE, 0x3F);
240
241 /* Enable auto-powersave, set charge pump to auto, red to battery */
242 ret |= lp5521_write(client, LP5521_REG_CONFIG,
243 LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO | LP5521_R_TO_BATT);
244
245 /* Initialize all channels PWM to zero -> leds off */
246 ret |= lp5521_write(client, LP5521_REG_R_PWM, 0);
247 ret |= lp5521_write(client, LP5521_REG_G_PWM, 0);
248 ret |= lp5521_write(client, LP5521_REG_B_PWM, 0);
249
250 /* Set engines are set to run state when OP_MODE enables engines */
251 ret |= lp5521_write(client, LP5521_REG_ENABLE,
252 LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM |
253 LP5521_EXEC_RUN);
254 /* enable takes 500us */
255 usleep_range(500, 20000);
256
257 return ret;
258}
259
260static int lp5521_run_selftest(struct lp5521_chip *chip, char *buf)
261{
262 int ret;
263 u8 status;
264
265 ret = lp5521_read(chip->client, LP5521_REG_STATUS, &status);
266 if (ret < 0)
267 return ret;
268
269 /* Check that ext clock is really in use if requested */
270 if (chip->pdata && chip->pdata->clock_mode == LP5521_CLOCK_EXT)
271 if ((status & LP5521_EXT_CLK_USED) == 0)
272 return -EIO;
273 return 0;
274}
275
276static void lp5521_set_brightness(struct led_classdev *cdev,
277 enum led_brightness brightness)
278{
279 struct lp5521_led *led = cdev_to_led(cdev);
280 led->brightness = (u8)brightness;
281 schedule_work(&led->brightness_work);
282}
283
284static void lp5521_led_brightness_work(struct work_struct *work)
285{
286 struct lp5521_led *led = container_of(work,
287 struct lp5521_led,
288 brightness_work);
289 struct lp5521_chip *chip = led_to_lp5521(led);
290 struct i2c_client *client = chip->client;
291
292 mutex_lock(&chip->lock);
293 lp5521_write(client, LP5521_REG_LED_PWM_BASE + led->chan_nr,
294 led->brightness);
295 mutex_unlock(&chip->lock);
296}
297
298/* Detect the chip by setting its ENABLE register and reading it back. */
299static int lp5521_detect(struct i2c_client *client)
300{
301 int ret;
302 u8 buf;
303
304 ret = lp5521_write(client, LP5521_REG_ENABLE,
305 LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM);
306 if (ret)
307 return ret;
308 usleep_range(1000, 10000);
309 ret = lp5521_read(client, LP5521_REG_ENABLE, &buf);
310 if (ret)
311 return ret;
312 if (buf != (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM))
313 return -ENODEV;
314
315 return 0;
316}
317
318/* Set engine mode and create appropriate sysfs attributes, if required. */
319static int lp5521_set_mode(struct lp5521_engine *engine, u8 mode)
320{
321 struct lp5521_chip *chip = engine_to_lp5521(engine);
322 struct i2c_client *client = chip->client;
323 struct device *dev = &client->dev;
324 int ret = 0;
325
326 /* if in that mode already do nothing, except for run */
327 if (mode == engine->mode && mode != LP5521_CMD_RUN)
328 return 0;
329
330 if (mode == LP5521_CMD_RUN) {
331 ret = lp5521_set_engine_mode(engine, LP5521_CMD_RUN);
332 } else if (mode == LP5521_CMD_LOAD) {
333 lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED);
334 lp5521_set_engine_mode(engine, LP5521_CMD_LOAD);
335
336 ret = sysfs_create_group(&dev->kobj, engine->attributes);
337 if (ret)
338 return ret;
339 } else if (mode == LP5521_CMD_DISABLED) {
340 lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED);
341 }
342
343 /* remove load attribute from sysfs if not in load mode */
344 if (engine->mode == LP5521_CMD_LOAD && mode != LP5521_CMD_LOAD)
345 sysfs_remove_group(&dev->kobj, engine->attributes);
346
347 engine->mode = mode;
348
349 return ret;
350}
351
352static int lp5521_do_store_load(struct lp5521_engine *engine,
353 const char *buf, size_t len)
354{
355 struct lp5521_chip *chip = engine_to_lp5521(engine);
356 struct i2c_client *client = chip->client;
357 int ret, nrchars, offset = 0, i = 0;
358 char c[3];
359 unsigned cmd;
360 u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
361
362 while ((offset < len - 1) && (i < LP5521_PROGRAM_LENGTH)) {
363 /* separate sscanfs because length is working only for %s */
364 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
365 ret = sscanf(c, "%2x", &cmd);
366 if (ret != 1)
367 goto fail;
368 pattern[i] = (u8)cmd;
369
370 offset += nrchars;
371 i++;
372 }
373
374 /* Each instruction is 16bit long. Check that length is even */
375 if (i % 2)
376 goto fail;
377
378 mutex_lock(&chip->lock);
379 ret = lp5521_load_program(engine, pattern);
380 mutex_unlock(&chip->lock);
381
382 if (ret) {
383 dev_err(&client->dev, "failed loading pattern\n");
384 return ret;
385 }
386
387 return len;
388fail:
389 dev_err(&client->dev, "wrong pattern format\n");
390 return -EINVAL;
391}
392
393static ssize_t store_engine_load(struct device *dev,
394 struct device_attribute *attr,
395 const char *buf, size_t len, int nr)
396{
397 struct i2c_client *client = to_i2c_client(dev);
398 struct lp5521_chip *chip = i2c_get_clientdata(client);
399 return lp5521_do_store_load(&chip->engines[nr - 1], buf, len);
400}
401
402#define store_load(nr) \
403static ssize_t store_engine##nr##_load(struct device *dev, \
404 struct device_attribute *attr, \
405 const char *buf, size_t len) \
406{ \
407 return store_engine_load(dev, attr, buf, len, nr); \
408}
409store_load(1)
410store_load(2)
411store_load(3)
412
413static ssize_t show_engine_mode(struct device *dev,
414 struct device_attribute *attr,
415 char *buf, int nr)
416{
417 struct i2c_client *client = to_i2c_client(dev);
418 struct lp5521_chip *chip = i2c_get_clientdata(client);
419 switch (chip->engines[nr - 1].mode) {
420 case LP5521_CMD_RUN:
421 return sprintf(buf, "run\n");
422 case LP5521_CMD_LOAD:
423 return sprintf(buf, "load\n");
424 case LP5521_CMD_DISABLED:
425 return sprintf(buf, "disabled\n");
426 default:
427 return sprintf(buf, "disabled\n");
428 }
429}
430
431#define show_mode(nr) \
432static ssize_t show_engine##nr##_mode(struct device *dev, \
433 struct device_attribute *attr, \
434 char *buf) \
435{ \
436 return show_engine_mode(dev, attr, buf, nr); \
437}
438show_mode(1)
439show_mode(2)
440show_mode(3)
441
442static ssize_t store_engine_mode(struct device *dev,
443 struct device_attribute *attr,
444 const char *buf, size_t len, int nr)
445{
446 struct i2c_client *client = to_i2c_client(dev);
447 struct lp5521_chip *chip = i2c_get_clientdata(client);
448 struct lp5521_engine *engine = &chip->engines[nr - 1];
449 mutex_lock(&chip->lock);
450
451 if (!strncmp(buf, "run", 3))
452 lp5521_set_mode(engine, LP5521_CMD_RUN);
453 else if (!strncmp(buf, "load", 4))
454 lp5521_set_mode(engine, LP5521_CMD_LOAD);
455 else if (!strncmp(buf, "disabled", 8))
456 lp5521_set_mode(engine, LP5521_CMD_DISABLED);
457
458 mutex_unlock(&chip->lock);
459 return len;
460}
461
462#define store_mode(nr) \
463static ssize_t store_engine##nr##_mode(struct device *dev, \
464 struct device_attribute *attr, \
465 const char *buf, size_t len) \
466{ \
467 return store_engine_mode(dev, attr, buf, len, nr); \
468}
469store_mode(1)
470store_mode(2)
471store_mode(3)
472
473static ssize_t show_max_current(struct device *dev,
474 struct device_attribute *attr,
475 char *buf)
476{
477 struct led_classdev *led_cdev = dev_get_drvdata(dev);
478 struct lp5521_led *led = cdev_to_led(led_cdev);
479
480 return sprintf(buf, "%d\n", led->max_current);
481}
482
483static ssize_t show_current(struct device *dev,
484 struct device_attribute *attr,
485 char *buf)
486{
487 struct led_classdev *led_cdev = dev_get_drvdata(dev);
488 struct lp5521_led *led = cdev_to_led(led_cdev);
489
490 return sprintf(buf, "%d\n", led->led_current);
491}
492
493static ssize_t store_current(struct device *dev,
494 struct device_attribute *attr,
495 const char *buf, size_t len)
496{
497 struct led_classdev *led_cdev = dev_get_drvdata(dev);
498 struct lp5521_led *led = cdev_to_led(led_cdev);
499 struct lp5521_chip *chip = led_to_lp5521(led);
500 ssize_t ret;
501 unsigned long curr;
502
503 if (strict_strtoul(buf, 0, &curr))
504 return -EINVAL;
505
506 if (curr > led->max_current)
507 return -EINVAL;
508
509 mutex_lock(&chip->lock);
510 ret = lp5521_set_led_current(chip, led->id, curr);
511 mutex_unlock(&chip->lock);
512
513 if (ret < 0)
514 return ret;
515
516 led->led_current = (u8)curr;
517
518 return len;
519}
520
521static ssize_t lp5521_selftest(struct device *dev,
522 struct device_attribute *attr,
523 char *buf)
524{
525 struct i2c_client *client = to_i2c_client(dev);
526 struct lp5521_chip *chip = i2c_get_clientdata(client);
527 int ret;
528
529 mutex_lock(&chip->lock);
530 ret = lp5521_run_selftest(chip, buf);
531 mutex_unlock(&chip->lock);
532 return sprintf(buf, "%s\n", ret ? "FAIL" : "OK");
533}
534
535/* led class device attributes */
536static DEVICE_ATTR(led_current, S_IRUGO | S_IWUGO, show_current, store_current);
537static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
538
539static struct attribute *lp5521_led_attributes[] = {
540 &dev_attr_led_current.attr,
541 &dev_attr_max_current.attr,
542 NULL,
543};
544
545static struct attribute_group lp5521_led_attribute_group = {
546 .attrs = lp5521_led_attributes
547};
548
549/* device attributes */
550static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUGO,
551 show_engine1_mode, store_engine1_mode);
552static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUGO,
553 show_engine2_mode, store_engine2_mode);
554static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUGO,
555 show_engine3_mode, store_engine3_mode);
556static DEVICE_ATTR(engine1_load, S_IWUGO, NULL, store_engine1_load);
557static DEVICE_ATTR(engine2_load, S_IWUGO, NULL, store_engine2_load);
558static DEVICE_ATTR(engine3_load, S_IWUGO, NULL, store_engine3_load);
559static DEVICE_ATTR(selftest, S_IRUGO, lp5521_selftest, NULL);
560
561static struct attribute *lp5521_attributes[] = {
562 &dev_attr_engine1_mode.attr,
563 &dev_attr_engine2_mode.attr,
564 &dev_attr_engine3_mode.attr,
565 &dev_attr_selftest.attr,
566 NULL
567};
568
569static struct attribute *lp5521_engine1_attributes[] = {
570 &dev_attr_engine1_load.attr,
571 NULL
572};
573
574static struct attribute *lp5521_engine2_attributes[] = {
575 &dev_attr_engine2_load.attr,
576 NULL
577};
578
579static struct attribute *lp5521_engine3_attributes[] = {
580 &dev_attr_engine3_load.attr,
581 NULL
582};
583
584static const struct attribute_group lp5521_group = {
585 .attrs = lp5521_attributes,
586};
587
588static const struct attribute_group lp5521_engine_group[] = {
589 {.attrs = lp5521_engine1_attributes },
590 {.attrs = lp5521_engine2_attributes },
591 {.attrs = lp5521_engine3_attributes },
592};
593
594static int lp5521_register_sysfs(struct i2c_client *client)
595{
596 struct device *dev = &client->dev;
597 return sysfs_create_group(&dev->kobj, &lp5521_group);
598}
599
600static void lp5521_unregister_sysfs(struct i2c_client *client)
601{
602 struct lp5521_chip *chip = i2c_get_clientdata(client);
603 struct device *dev = &client->dev;
604 int i;
605
606 sysfs_remove_group(&dev->kobj, &lp5521_group);
607
608 for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
609 if (chip->engines[i].mode == LP5521_CMD_LOAD)
610 sysfs_remove_group(&dev->kobj,
611 chip->engines[i].attributes);
612 }
613
614 for (i = 0; i < chip->num_leds; i++)
615 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
616 &lp5521_led_attribute_group);
617}
618
619static int __init lp5521_init_led(struct lp5521_led *led,
620 struct i2c_client *client,
621 int chan, struct lp5521_platform_data *pdata)
622{
623 struct device *dev = &client->dev;
624 char name[32];
625 int res;
626
627 if (chan >= LP5521_MAX_LEDS)
628 return -EINVAL;
629
630 if (pdata->led_config[chan].led_current == 0)
631 return 0;
632
633 led->led_current = pdata->led_config[chan].led_current;
634 led->max_current = pdata->led_config[chan].max_current;
635 led->chan_nr = pdata->led_config[chan].chan_nr;
636
637 if (led->chan_nr >= LP5521_MAX_LEDS) {
638 dev_err(dev, "Use channel numbers between 0 and %d\n",
639 LP5521_MAX_LEDS - 1);
640 return -EINVAL;
641 }
642
643 snprintf(name, sizeof(name), "%s:channel%d", client->name, chan);
644 led->cdev.brightness_set = lp5521_set_brightness;
645 led->cdev.name = name;
646 res = led_classdev_register(dev, &led->cdev);
647 if (res < 0) {
648 dev_err(dev, "couldn't register led on channel %d\n", chan);
649 return res;
650 }
651
652 res = sysfs_create_group(&led->cdev.dev->kobj,
653 &lp5521_led_attribute_group);
654 if (res < 0) {
655 dev_err(dev, "couldn't register current attribute\n");
656 led_classdev_unregister(&led->cdev);
657 return res;
658 }
659 return 0;
660}
661
662static int lp5521_probe(struct i2c_client *client,
663 const struct i2c_device_id *id)
664{
665 struct lp5521_chip *chip;
666 struct lp5521_platform_data *pdata;
667 int ret, i, led;
668
669 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
670 if (!chip)
671 return -ENOMEM;
672
673 i2c_set_clientdata(client, chip);
674 chip->client = client;
675
676 pdata = client->dev.platform_data;
677
678 if (!pdata) {
679 dev_err(&client->dev, "no platform data\n");
680 ret = -EINVAL;
681 goto fail1;
682 }
683
684 mutex_init(&chip->lock);
685
686 chip->pdata = pdata;
687
688 if (pdata->setup_resources) {
689 ret = pdata->setup_resources();
690 if (ret < 0)
691 goto fail1;
692 }
693
694 if (pdata->enable) {
695 pdata->enable(0);
696 usleep_range(1000, 10000);
697 pdata->enable(1);
698 usleep_range(1000, 10000); /* Spec says min 500us */
699 }
700
701 ret = lp5521_detect(client);
702
703 if (ret) {
704 dev_err(&client->dev, "Chip not found\n");
705 goto fail2;
706 }
707
708 dev_info(&client->dev, "%s programmable led chip found\n", id->name);
709
710 ret = lp5521_configure(client, lp5521_engine_group);
711 if (ret < 0) {
712 dev_err(&client->dev, "error configuring chip\n");
713 goto fail2;
714 }
715
716 /* Initialize leds */
717 chip->num_channels = pdata->num_channels;
718 chip->num_leds = 0;
719 led = 0;
720 for (i = 0; i < pdata->num_channels; i++) {
721 /* Do not initialize channels that are not connected */
722 if (pdata->led_config[i].led_current == 0)
723 continue;
724
725 ret = lp5521_init_led(&chip->leds[led], client, i, pdata);
726 if (ret) {
727 dev_err(&client->dev, "error initializing leds\n");
728 goto fail3;
729 }
730 chip->num_leds++;
731
732 chip->leds[led].id = led;
733 /* Set initial LED current */
734 lp5521_set_led_current(chip, led,
735 chip->leds[led].led_current);
736
737 INIT_WORK(&(chip->leds[led].brightness_work),
738 lp5521_led_brightness_work);
739
740 led++;
741 }
742
743 ret = lp5521_register_sysfs(client);
744 if (ret) {
745 dev_err(&client->dev, "registering sysfs failed\n");
746 goto fail3;
747 }
748 return ret;
749fail3:
750 for (i = 0; i < chip->num_leds; i++) {
751 led_classdev_unregister(&chip->leds[i].cdev);
752 cancel_work_sync(&chip->leds[i].brightness_work);
753 }
754fail2:
755 if (pdata->enable)
756 pdata->enable(0);
757 if (pdata->release_resources)
758 pdata->release_resources();
759fail1:
760 kfree(chip);
761 return ret;
762}
763
764static int lp5521_remove(struct i2c_client *client)
765{
766 struct lp5521_chip *chip = i2c_get_clientdata(client);
767 int i;
768
769 lp5521_unregister_sysfs(client);
770
771 for (i = 0; i < chip->num_leds; i++) {
772 led_classdev_unregister(&chip->leds[i].cdev);
773 cancel_work_sync(&chip->leds[i].brightness_work);
774 }
775
776 if (chip->pdata->enable)
777 chip->pdata->enable(0);
778 if (chip->pdata->release_resources)
779 chip->pdata->release_resources();
780 kfree(chip);
781 return 0;
782}
783
784static const struct i2c_device_id lp5521_id[] = {
785 { "lp5521", 0 }, /* Three channel chip */
786 { }
787};
788MODULE_DEVICE_TABLE(i2c, lp5521_id);
789
790static struct i2c_driver lp5521_driver = {
791 .driver = {
792 .name = "lp5521",
793 },
794 .probe = lp5521_probe,
795 .remove = lp5521_remove,
796 .id_table = lp5521_id,
797};
798
799static int __init lp5521_init(void)
800{
801 int ret;
802
803 ret = i2c_add_driver(&lp5521_driver);
804
805 if (ret < 0)
806 printk(KERN_ALERT "Adding lp5521 driver failed\n");
807
808 return ret;
809}
810
811static void __exit lp5521_exit(void)
812{
813 i2c_del_driver(&lp5521_driver);
814}
815
816module_init(lp5521_init);
817module_exit(lp5521_exit);
818
819MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
820MODULE_DESCRIPTION("LP5521 LED engine");
821MODULE_LICENSE("GPL v2");
kernel source for telekom puls (alcatel/mediatek)