summaryrefslogtreecommitdiffstats
path: root/drivers/leds/leds-bd2802.c
blob: 4149ecb3a9b2fda0a22cb93c2575ea16096c4bcd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
/*
 * leds-bd2802.c - RGB LED Driver
 *
 * Copyright (C) 2009 Samsung Electronics
 * Kim Kyuwon <q1.kim@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Datasheet: http://www.rohm.com/products/databook/driver/pdf/bd2802gu-e.pdf
 *
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/leds.h>
#include <linux/leds-bd2802.h>


#define LED_CTL(rgb2en, rgb1en) ((rgb2en) << 4 | ((rgb1en) << 0))

#define BD2802_LED_OFFSET		0xa
#define BD2802_COLOR_OFFSET		0x3

#define BD2802_REG_CLKSETUP 		0x00
#define BD2802_REG_CONTROL 		0x01
#define BD2802_REG_HOURSETUP		0x02
#define BD2802_REG_CURRENT1SETUP	0x03
#define BD2802_REG_CURRENT2SETUP	0x04
#define BD2802_REG_WAVEPATTERN		0x05

#define BD2802_CURRENT_032		0x10 /* 3.2mA */
#define BD2802_CURRENT_000		0x00 /* 0.0mA */

#define BD2802_PATTERN_FULL		0x07
#define BD2802_PATTERN_HALF		0x03

enum led_ids {
	LED1,
	LED2,
	LED_NUM,
};

enum led_colors {
	RED,
	GREEN,
	BLUE,
};

enum led_bits {
	BD2802_OFF,
	BD2802_BLINK,
	BD2802_ON,
};

/*
 * State '0' : 'off'
 * State '1' : 'blink'
 * State '2' : 'on'.
 */
struct led_state {
	unsigned r:2;
	unsigned g:2;
	unsigned b:2;
};

struct bd2802_led {
	struct bd2802_led_platform_data	*pdata;
	struct i2c_client		*client;
	struct rw_semaphore		rwsem;
	struct work_struct		work;

	struct led_state		led[2];

	/*
	 * Making led_classdev as array is not recommended, because array
	 * members prevent using 'container_of' macro. So repetitive works
	 * are needed.
	 */
	struct led_classdev		cdev_led1r;
	struct led_classdev		cdev_led1g;
	struct led_classdev		cdev_led1b;
	struct led_classdev		cdev_led2r;
	struct led_classdev		cdev_led2g;
	struct led_classdev		cdev_led2b;

	/*
	 * Advanced Configuration Function(ADF) mode:
	 * In ADF mode, user can set registers of BD2802GU directly,
	 * therefore BD2802GU doesn't enter reset state.
	 */
	int 				adf_on;

	enum led_ids			led_id;
	enum led_colors			color;
	enum led_bits			state;
};


/*--------------------------------------------------------------*/
/*	BD2802GU helper functions					*/
/*--------------------------------------------------------------*/

static inline int bd2802_is_rgb_off(struct bd2802_led *led, enum led_ids id,
							enum led_colors color)
{
	switch (color) {
	case RED:
		return !led->led[id].r;
	case GREEN:
		return !led->led[id].g;
	case BLUE:
		return !led->led[id].b;
	default:
		dev_err(&led->client->dev, "%s: Invalid color\n", __func__);
		return -EINVAL;
	}
}

static inline int bd2802_is_led_off(struct bd2802_led *led, enum led_ids id)
{
	if (led->led[id].r || led->led[id].g || led->led[id].b)
		return 0;

	return 1;
}

static inline int bd2802_is_all_off(struct bd2802_led *led)
{
	int i;

	for (i = 0; i < LED_NUM; i++)
		if (!bd2802_is_led_off(led, i))
			return 0;

	return 1;
}

static inline u8 bd2802_get_base_offset(enum led_ids id, enum led_colors color)
{
	return id * BD2802_LED_OFFSET + color * BD2802_COLOR_OFFSET;
}

static inline u8 bd2802_get_reg_addr(enum led_ids id, enum led_colors color,
								u8 reg_offset)
{
	return reg_offset + bd2802_get_base_offset(id, color);
}


/*--------------------------------------------------------------*/
/*	BD2802GU core functions					*/
/*--------------------------------------------------------------*/

static int bd2802_write_byte(struct i2c_client *client, u8 reg, u8 val)
{
	int ret = i2c_smbus_write_byte_data(client, reg, val);
	if (ret >= 0)
		return 0;

	dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
						__func__, reg, val, ret);

	return ret;
}

static void bd2802_update_state(struct bd2802_led *led, enum led_ids id,
				enum led_colors color, enum led_bits led_bit)
{
	int i;
	u8 value;

	for (i = 0; i < LED_NUM; i++) {
		if (i == id) {
			switch (color) {
			case RED:
				led->led[i].r = led_bit;
				break;
			case GREEN:
				led->led[i].g = led_bit;
				break;
			case BLUE:
				led->led[i].b = led_bit;
				break;
			default:
				dev_err(&led->client->dev,
					"%s: Invalid color\n", __func__);
				return;
			}
		}
	}

	if (led_bit == BD2802_BLINK || led_bit == BD2802_ON)
		return;

	if (!bd2802_is_led_off(led, id))
		return;

	if (bd2802_is_all_off(led) && !led->adf_on) {
		gpio_set_value(led->pdata->reset_gpio, 0);
		return;
	}

	/*
	 * In this case, other led is turned on, and current led is turned
	 * off. So set RGB LED Control register to stop the current RGB LED
	 */
	value = (id == LED1) ? LED_CTL(1, 0) : LED_CTL(0, 1);
	bd2802_write_byte(led->client, BD2802_REG_CONTROL, value);
}

static void bd2802_configure(struct bd2802_led *led)
{
	struct bd2802_led_platform_data *pdata = led->pdata;
	u8 reg;

	reg = bd2802_get_reg_addr(LED1, RED, BD2802_REG_HOURSETUP);
	bd2802_write_byte(led->client, reg, pdata->rgb_time);

	reg = bd2802_get_reg_addr(LED2, RED, BD2802_REG_HOURSETUP);
	bd2802_write_byte(led->client, reg, pdata->rgb_time);
}

static void bd2802_reset_cancel(struct bd2802_led *led)
{
	gpio_set_value(led->pdata->reset_gpio, 1);
	udelay(100);
	bd2802_configure(led);
}

static void bd2802_enable(struct bd2802_led *led, enum led_ids id)
{
	enum led_ids other_led = (id == LED1) ? LED2 : LED1;
	u8 value, other_led_on;

	other_led_on = !bd2802_is_led_off(led, other_led);
	if (id == LED1)
		value = LED_CTL(other_led_on, 1);
	else
		value = LED_CTL(1 , other_led_on);

	bd2802_write_byte(led->client, BD2802_REG_CONTROL, value);
}

static void bd2802_set_on(struct bd2802_led *led, enum led_ids id,
							enum led_colors color)
{
	u8 reg;

	if (bd2802_is_all_off(led) && !led->adf_on)
		bd2802_reset_cancel(led);

	reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
	bd2802_write_byte(led->client, reg, BD2802_CURRENT_032);
	reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
	bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
	reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN);
	bd2802_write_byte(led->client, reg, BD2802_PATTERN_FULL);

	bd2802_enable(led, id);
	bd2802_update_state(led, id, color, BD2802_ON);
}

static void bd2802_set_blink(struct bd2802_led *led, enum led_ids id,
							enum led_colors color)
{
	u8 reg;

	if (bd2802_is_all_off(led) && !led->adf_on)
		bd2802_reset_cancel(led);

	reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
	bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
	reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
	bd2802_write_byte(led->client, reg, BD2802_CURRENT_032);
	reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN);
	bd2802_write_byte(led->client, reg, BD2802_PATTERN_HALF);

	bd2802_enable(led, id);
	bd2802_update_state(led, id, color, BD2802_BLINK);
}

static void bd2802_turn_on(struct bd2802_led *led, enum led_ids id,
				enum led_colors color, enum led_bits led_bit)
{
	if (led_bit == BD2802_OFF) {
		dev_err(&led->client->dev,
					"Only 'blink' and 'on' are allowed\n");
		return;
	}

	if (led_bit == BD2802_BLINK)
		bd2802_set_blink(led, id, color);
	else
		bd2802_set_on(led, id, color);
}

static void bd2802_turn_off(struct bd2802_led *led, enum led_ids id,
							enum led_colors color)
{
	u8 reg;

	if (bd2802_is_rgb_off(led, id, color))
		return;

	reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
	bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
	reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
	bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);

	bd2802_update_state(led, id, color, BD2802_OFF);
}

static void bd2802_restore_state(struct bd2802_led *led)
{
	int i;

	for (i = 0; i < LED_NUM; i++) {
		if (led->led[i].r)
			bd2802_turn_on(led, i, RED, led->led[i].r);
		if (led->led[i].g)
			bd2802_turn_on(led, i, GREEN, led->led[i].g);
		if (led->led[i].b)
			bd2802_turn_on(led, i, BLUE, led->led[i].b);
	}
}

#define BD2802_SET_REGISTER(reg_addr, reg_name)				\
static ssize_t bd2802_store_reg##reg_addr(struct device *dev,		\
	struct device_attribute *attr, const char *buf, size_t count)	\
{									\
	struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
	unsigned long val;						\
	int ret;							\
	if (!count)							\
		return -EINVAL;						\
	ret = strict_strtoul(buf, 16, &val);				\
	if (ret)							\
		return ret;						\
	down_write(&led->rwsem);					\
	bd2802_write_byte(led->client, reg_addr, (u8) val);		\
	up_write(&led->rwsem);						\
	return count;							\
}									\
static struct device_attribute bd2802_reg##reg_addr##_attr = {		\
	.attr = {.name = reg_name, .mode = 0644, .owner = THIS_MODULE},	\
	.store = bd2802_store_reg##reg_addr,				\
};

BD2802_SET_REGISTER(0x00, "0x00");
BD2802_SET_REGISTER(0x01, "0x01");
BD2802_SET_REGISTER(0x02, "0x02");
BD2802_SET_REGISTER(0x03, "0x03");
BD2802_SET_REGISTER(0x04, "0x04");
BD2802_SET_REGISTER(0x05, "0x05");
BD2802_SET_REGISTER(0x06, "0x06");
BD2802_SET_REGISTER(0x07, "0x07");
BD2802_SET_REGISTER(0x08, "0x08");
BD2802_SET_REGISTER(0x09, "0x09");
BD2802_SET_REGISTER(0x0a, "0x0a");
BD2802_SET_REGISTER(0x0b, "0x0b");
BD2802_SET_REGISTER(0x0c, "0x0c");
BD2802_SET_REGISTER(0x0d, "0x0d");
BD2802_SET_REGISTER(0x0e, "0x0e");
BD2802_SET_REGISTER(0x0f, "0x0f");
BD2802_SET_REGISTER(0x10, "0x10");
BD2802_SET_REGISTER(0x11, "0x11");
BD2802_SET_REGISTER(0x12, "0x12");
BD2802_SET_REGISTER(0x13, "0x13");
BD2802_SET_REGISTER(0x14, "0x14");
BD2802_SET_REGISTER(0x15, "0x15");

static struct device_attribute *bd2802_addr_attributes[] = {
	&bd2802_reg0x00_attr,
	&bd2802_reg0x01_attr,
	&bd2802_reg0x02_attr,
	&bd2802_reg0x03_attr,
	&bd2802_reg0x04_attr,
	&bd2802_reg0x05_attr,
	&bd2802_reg0x06_attr,
	&bd2802_reg0x07_attr,
	&bd2802_reg0x08_attr,
	&bd2802_reg0x09_attr,
	&bd2802_reg0x0a_attr,
	&bd2802_reg0x0b_attr,
	&bd2802_reg0x0c_attr,
	&bd2802_reg0x0d_attr,
	&bd2802_reg0x0e_attr,
	&bd2802_reg0x0f_attr,
	&bd2802_reg0x10_attr,
	&bd2802_reg0x11_attr,
	&bd2802_reg0x12_attr,
	&bd2802_reg0x13_attr,
	&bd2802_reg0x14_attr,
	&bd2802_reg0x15_attr,
};

static void bd2802_enable_adv_conf(struct bd2802_led *led)
{
	int i, ret;

	for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++) {
		ret = device_create_file(&led->client->dev,
						bd2802_addr_attributes[i]);
		if (ret) {
			dev_err(&led->client->dev, "failed to sysfs file %s\n",
					bd2802_addr_attributes[i]->attr.name);
			goto failed_remove_files;
		}
	}

	if (bd2802_is_all_off(led))
		bd2802_reset_cancel(led);

	led->adf_on = 1;

	return;

failed_remove_files:
	for (i--; i >= 0; i--)
		device_remove_file(&led->client->dev,
						bd2802_addr_attributes[i]);
}

static void bd2802_disable_adv_conf(struct bd2802_led *led)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++)
		device_remove_file(&led->client->dev,
						bd2802_addr_attributes[i]);

	if (bd2802_is_all_off(led))
		gpio_set_value(led->pdata->reset_gpio, 0);

	led->adf_on = 0;
}

static ssize_t bd2802_show_adv_conf(struct device *dev,
	struct device_attribute *attr, char *buf)
{
	struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
	ssize_t ret;

	down_read(&led->rwsem);
	if (led->adf_on)
		ret = sprintf(buf, "on\n");
	else
		ret = sprintf(buf, "off\n");
	up_read(&led->rwsem);

	return ret;
}

static ssize_t bd2802_store_adv_conf(struct device *dev,
	struct device_attribute *attr, const char *buf, size_t count)
{
	struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));

	if (!count)
		return -EINVAL;

	down_write(&led->rwsem);
	if (!led->adf_on && !strncmp(buf, "on", 2))
		bd2802_enable_adv_conf(led);
	else if (led->adf_on && !strncmp(buf, "off", 3))
		bd2802_disable_adv_conf(led);
	up_write(&led->rwsem);

	return count;
}

static struct device_attribute bd2802_adv_conf_attr = {
	.attr = {
		.name = "advanced_configuration",
		.mode = 0644,
		.owner = THIS_MODULE
	},
	.show = bd2802_show_adv_conf,
	.store = bd2802_store_adv_conf,
};

static void bd2802_led_work(struct work_struct *work)
{
	struct bd2802_led *led = container_of(work, struct bd2802_led, work);

	if (led->state)
		bd2802_turn_on(led, led->led_id, led->color, led->state);
	else
		bd2802_turn_off(led, led->led_id, led->color);
}

#define BD2802_CONTROL_RGBS(name, id, clr)				\
static void bd2802_set_##name##_brightness(struct led_classdev *led_cdev,\
					enum led_brightness value)	\
{									\
	struct bd2802_led *led =					\
		container_of(led_cdev, struct bd2802_led, cdev_##name);	\
	led->led_id = id;						\
	led->color = clr;						\
	if (value == LED_OFF)						\
		led->state = BD2802_OFF;				\
	else								\
		led->state = BD2802_ON;					\
	schedule_work(&led->work);					\
}									\
static int bd2802_set_##name##_blink(struct led_classdev *led_cdev,	\
		unsigned long *delay_on, unsigned long *delay_off)	\
{									\
	struct bd2802_led *led =					\
		container_of(led_cdev, struct bd2802_led, cdev_##name);	\
	if (*delay_on == 0 || *delay_off == 0)				\
		return -EINVAL;						\
	led->led_id = id;						\
	led->color = clr;						\
	led->state = BD2802_BLINK;					\
	schedule_work(&led->work);					\
	return 0;							\
}

BD2802_CONTROL_RGBS(led1r, LED1, RED);
BD2802_CONTROL_RGBS(led1g, LED1, GREEN);
BD2802_CONTROL_RGBS(led1b, LED1, BLUE);
BD2802_CONTROL_RGBS(led2r, LED2, RED);
BD2802_CONTROL_RGBS(led2g, LED2, GREEN);
BD2802_CONTROL_RGBS(led2b, LED2, BLUE);

static int bd2802_register_led_classdev(struct bd2802_led *led)
{
	int ret;

	INIT_WORK(&led->work, bd2802_led_work);

	led->cdev_led1r.name = "led1_R";
	led->cdev_led1r.brightness = LED_OFF;
	led->cdev_led1r.brightness_set = bd2802_set_led1r_brightness;
	led->cdev_led1r.blink_set = bd2802_set_led1r_blink;
	led->cdev_led1r.flags |= LED_CORE_SUSPENDRESUME;

	ret = led_classdev_register(&led->client->dev, &led->cdev_led1r);
	if (ret < 0) {
		dev_err(&led->client->dev, "couldn't register LED %s\n",
							led->cdev_led1r.name);
		goto failed_unregister_led1_R;
	}

	led->cdev_led1g.name = "led1_G";
	led->cdev_led1g.brightness = LED_OFF;
	led->cdev_led1g.brightness_set = bd2802_set_led1g_brightness;
	led->cdev_led1g.blink_set = bd2802_set_led1g_blink;
	led->cdev_led1g.flags |= LED_CORE_SUSPENDRESUME;

	ret = led_classdev_register(&led->client->dev, &led->cdev_led1g);
	if (ret < 0) {
		dev_err(&led->client->dev, "couldn't register LED %s\n",
							led->cdev_led1g.name);
		goto failed_unregister_led1_G;
	}

	led->cdev_led1b.name = "led1_B";
	led->cdev_led1b.brightness = LED_OFF;
	led->cdev_led1b.brightness_set = bd2802_set_led1b_brightness;
	led->cdev_led1b.blink_set = bd2802_set_led1b_blink;
	led->cdev_led1b.flags |= LED_CORE_SUSPENDRESUME;

	ret = led_classdev_register(&led->client->dev, &led->cdev_led1b);
	if (ret < 0) {
		dev_err(&led->client->dev, "couldn't register LED %s\n",
							led->cdev_led1b.name);
		goto failed_unregister_led1_B;
	}

	led->cdev_led2r.name = "led2_R";
	led->cdev_led2r.brightness = LED_OFF;
	led->cdev_led2r.brightness_set = bd2802_set_led2r_brightness;
	led->cdev_led2r.blink_set = bd2802_set_led2r_blink;
	led->cdev_led2r.flags |= LED_CORE_SUSPENDRESUME;

	ret = led_classdev_register(&led->client->dev, &led->cdev_led2r);
	if (ret < 0) {
		dev_err(&led->client->dev, "couldn't register LED %s\n",
							led->cdev_led2r.name);
		goto failed_unregister_led2_R;
	}

	led->cdev_led2g.name = "led2_G";
	led->cdev_led2g.brightness = LED_OFF;
	led->cdev_led2g.brightness_set = bd2802_set_led2g_brightness;
	led->cdev_led2g.blink_set = bd2802_set_led2g_blink;
	led->cdev_led2g.flags |= LED_CORE_SUSPENDRESUME;

	ret = led_classdev_register(&led->client->dev, &led->cdev_led2g);
	if (ret < 0) {
		dev_err(&led->client->dev, "couldn't register LED %s\n",
							led->cdev_led2g.name);
		goto failed_unregister_led2_G;
	}

	led->cdev_led2b.name = "led2_B";
	led->cdev_led2b.brightness = LED_OFF;
	led->cdev_led2b.brightness_set = bd2802_set_led2b_brightness;
	led->cdev_led2b.blink_set = bd2802_set_led2b_blink;
	led->cdev_led2b.flags |= LED_CORE_SUSPENDRESUME;

	ret = led_classdev_register(&led->client->dev, &led->cdev_led2b);
	if (ret < 0) {
		dev_err(&led->client->dev, "couldn't register LED %s\n",
							led->cdev_led2b.name);
		goto failed_unregister_led2_B;
	}

	return 0;

failed_unregister_led2_B:
	led_classdev_unregister(&led->cdev_led2g);
failed_unregister_led2_G:
	led_classdev_unregister(&led->cdev_led2r);
failed_unregister_led2_R:
	led_classdev_unregister(&led->cdev_led1b);
failed_unregister_led1_B:
	led_classdev_unregister(&led->cdev_led1g);
failed_unregister_led1_G:
	led_classdev_unregister(&led->cdev_led1r);
failed_unregister_led1_R:

	return ret;
}

static void bd2802_unregister_led_classdev(struct bd2802_led *led)
{
	cancel_work_sync(&led->work);
	led_classdev_unregister(&led->cdev_led1r);
}

static int __devinit bd2802_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct bd2802_led *led;
	struct bd2802_led_platform_data *pdata;
	int ret;

	led = kzalloc(sizeof(struct bd2802_led), GFP_KERNEL);
	if (!led) {
		dev_err(&client->dev, "failed to allocate driver data\n");
		return -ENOMEM;
	}

	led->client = client;
	pdata = led->pdata = client->dev.platform_data;
	i2c_set_clientdata(client, led);

	/* Configure RESET GPIO (L: RESET, H: RESET cancel) */
	gpio_request(pdata->reset_gpio, "RGB_RESETB");
	gpio_direction_output(pdata->reset_gpio, 1);

	/* Tacss = min 0.1ms */
	udelay(100);

	/* Detect BD2802GU */
	ret = bd2802_write_byte(client, BD2802_REG_CLKSETUP, 0x00);
	if (ret < 0) {
		dev_err(&client->dev, "failed to detect device\n");
		goto failed_free;
	} else
		dev_info(&client->dev, "return 0x%02x\n", ret);

	/* To save the power, reset BD2802 after detecting */
	gpio_set_value(led->pdata->reset_gpio, 0);

	init_rwsem(&led->rwsem);

	ret = device_create_file(&client->dev, &bd2802_adv_conf_attr);
	if (ret) {
		dev_err(&client->dev, "failed to create sysfs file %s\n",
					bd2802_adv_conf_attr.attr.name);
		goto failed_free;
	}

	ret = bd2802_register_led_classdev(led);
	if (ret < 0)
		goto failed_unregister_dev_file;

	return 0;

failed_unregister_dev_file:
	device_remove_file(&client->dev, &bd2802_adv_conf_attr);
failed_free:
	i2c_set_clientdata(client, NULL);
	kfree(led);

	return ret;
}

static int __exit bd2802_remove(struct i2c_client *client)
{
	struct bd2802_led *led = i2c_get_clientdata(client);

	bd2802_unregister_led_classdev(led);
	gpio_set_value(led->pdata->reset_gpio, 0);
	if (led->adf_on)
		bd2802_disable_adv_conf(led);
	device_remove_file(&client->dev, &bd2802_adv_conf_attr);
	i2c_set_clientdata(client, NULL);
	kfree(led);

	return 0;
}

static int bd2802_suspend(struct i2c_client *client, pm_message_t mesg)
{
	struct bd2802_led *led = i2c_get_clientdata(client);

	gpio_set_value(led->pdata->reset_gpio, 0);

	return 0;
}

static int bd2802_resume(struct i2c_client *client)
{
	struct bd2802_led *led = i2c_get_clientdata(client);

	if (!bd2802_is_all_off(led) || led->adf_on) {
		gpio_set_value(led->pdata->reset_gpio, 1);
		udelay(100);
		bd2802_restore_state(led);
	}

	return 0;
}

static const struct i2c_device_id bd2802_id[] = {
	{ "BD2802", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, bd2802_id);

static struct i2c_driver bd2802_i2c_driver = {
	.driver	= {
		.name	= "BD2802",
	},
	.probe		= bd2802_probe,
	.remove		= __exit_p(bd2802_remove),
	.suspend	= bd2802_suspend,
	.resume		= bd2802_resume,
	.id_table	= bd2802_id,
};

static int __init bd2802_init(void)
{
	return i2c_add_driver(&bd2802_i2c_driver);
}
module_init(bd2802_init);

static void __exit bd2802_exit(void)
{
	i2c_del_driver(&bd2802_i2c_driver);
}
module_exit(bd2802_exit);

MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>");
MODULE_DESCRIPTION("BD2802 LED driver");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud