summaryrefslogtreecommitdiffstats
path: root/drivers/leds/leds-lm3533.c
blob: 9dd205870525c4f753d656b169e94d2754fbb768 (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * leds-lm3533.c -- LM3533 LED driver
 *
 * Copyright (C) 2011-2012 Texas Instruments
 *
 * Author: Johan Hovold <jhovold@gmail.com>
 */

#include <linux/module.h>
#include <linux/leds.h>
#include <linux/mfd/core.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include <linux/mfd/lm3533.h>


#define LM3533_LVCTRLBANK_MIN		2
#define LM3533_LVCTRLBANK_MAX		5
#define LM3533_LVCTRLBANK_COUNT		4
#define LM3533_RISEFALLTIME_MAX		7
#define LM3533_ALS_CHANNEL_LV_MIN	1
#define LM3533_ALS_CHANNEL_LV_MAX	2

#define LM3533_REG_CTRLBANK_BCONF_BASE		0x1b
#define LM3533_REG_PATTERN_ENABLE		0x28
#define LM3533_REG_PATTERN_LOW_TIME_BASE	0x71
#define LM3533_REG_PATTERN_HIGH_TIME_BASE	0x72
#define LM3533_REG_PATTERN_RISETIME_BASE	0x74
#define LM3533_REG_PATTERN_FALLTIME_BASE	0x75

#define LM3533_REG_PATTERN_STEP			0x10

#define LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK		0x04
#define LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK		0x02
#define LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK	0x01

#define LM3533_LED_FLAG_PATTERN_ENABLE		1


struct lm3533_led {
	struct lm3533 *lm3533;
	struct lm3533_ctrlbank cb;
	struct led_classdev cdev;
	int id;

	struct mutex mutex;
	unsigned long flags;
};


static inline struct lm3533_led *to_lm3533_led(struct led_classdev *cdev)
{
	return container_of(cdev, struct lm3533_led, cdev);
}

static inline int lm3533_led_get_ctrlbank_id(struct lm3533_led *led)
{
	return led->id + 2;
}

static inline u8 lm3533_led_get_lv_reg(struct lm3533_led *led, u8 base)
{
	return base + led->id;
}

static inline u8 lm3533_led_get_pattern(struct lm3533_led *led)
{
	return led->id;
}

static inline u8 lm3533_led_get_pattern_reg(struct lm3533_led *led,
								u8 base)
{
	return base + lm3533_led_get_pattern(led) * LM3533_REG_PATTERN_STEP;
}

static int lm3533_led_pattern_enable(struct lm3533_led *led, int enable)
{
	u8 mask;
	u8 val;
	int pattern;
	int state;
	int ret = 0;

	dev_dbg(led->cdev.dev, "%s - %d\n", __func__, enable);

	mutex_lock(&led->mutex);

	state = test_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
	if ((enable && state) || (!enable && !state))
		goto out;

	pattern = lm3533_led_get_pattern(led);
	mask = 1 << (2 * pattern);

	if (enable)
		val = mask;
	else
		val = 0;

	ret = lm3533_update(led->lm3533, LM3533_REG_PATTERN_ENABLE, val, mask);
	if (ret) {
		dev_err(led->cdev.dev, "failed to enable pattern %d (%d)\n",
							pattern, enable);
		goto out;
	}

	__change_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
out:
	mutex_unlock(&led->mutex);

	return ret;
}

static int lm3533_led_set(struct led_classdev *cdev,
						enum led_brightness value)
{
	struct lm3533_led *led = to_lm3533_led(cdev);

	dev_dbg(led->cdev.dev, "%s - %d\n", __func__, value);

	if (value == 0)
		lm3533_led_pattern_enable(led, 0);	/* disable blink */

	return lm3533_ctrlbank_set_brightness(&led->cb, value);
}

static enum led_brightness lm3533_led_get(struct led_classdev *cdev)
{
	struct lm3533_led *led = to_lm3533_led(cdev);
	u8 val;
	int ret;

	ret = lm3533_ctrlbank_get_brightness(&led->cb, &val);
	if (ret)
		return ret;

	dev_dbg(led->cdev.dev, "%s - %u\n", __func__, val);

	return val;
}

/* Pattern generator defines (delays in us). */
#define LM3533_LED_DELAY1_VMIN	0x00
#define LM3533_LED_DELAY2_VMIN	0x3d
#define LM3533_LED_DELAY3_VMIN	0x80

#define LM3533_LED_DELAY1_VMAX	(LM3533_LED_DELAY2_VMIN - 1)
#define LM3533_LED_DELAY2_VMAX	(LM3533_LED_DELAY3_VMIN - 1)
#define LM3533_LED_DELAY3_VMAX	0xff

#define LM3533_LED_DELAY1_TMIN	16384U
#define LM3533_LED_DELAY2_TMIN	1130496U
#define LM3533_LED_DELAY3_TMIN	10305536U

#define LM3533_LED_DELAY1_TMAX	999424U
#define LM3533_LED_DELAY2_TMAX	9781248U
#define LM3533_LED_DELAY3_TMAX	76890112U

/* t_step = (t_max - t_min) / (v_max - v_min) */
#define LM3533_LED_DELAY1_TSTEP	16384
#define LM3533_LED_DELAY2_TSTEP	131072
#define LM3533_LED_DELAY3_TSTEP	524288

/* Delay limits for hardware accelerated blinking (in ms). */
#define LM3533_LED_DELAY_ON_MAX \
	((LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY2_TSTEP / 2) / 1000)
#define LM3533_LED_DELAY_OFF_MAX \
	((LM3533_LED_DELAY3_TMAX + LM3533_LED_DELAY3_TSTEP / 2) / 1000)

/*
 * Returns linear map of *t from [t_min,t_max] to [v_min,v_max] with a step
 * size of t_step, where
 *
 *	t_step = (t_max - t_min) / (v_max - v_min)
 *
 * and updates *t to reflect the mapped value.
 */
static u8 time_to_val(unsigned *t, unsigned t_min, unsigned t_step,
							u8 v_min, u8 v_max)
{
	unsigned val;

	val = (*t + t_step / 2 - t_min) / t_step + v_min;

	*t = t_step * (val - v_min) + t_min;

	return (u8)val;
}

/*
 * Returns time code corresponding to *delay (in ms) and updates *delay to
 * reflect actual hardware delay.
 *
 * Hardware supports 256 discrete delay times, divided into three groups with
 * the following ranges and step-sizes:
 *
 *	[   16,   999]	[0x00, 0x3e]	step  16 ms
 *	[ 1130,  9781]	[0x3d, 0x7f]	step 131 ms
 *	[10306, 76890]	[0x80, 0xff]	step 524 ms
 *
 * Note that delay group 3 is only available for delay_off.
 */
static u8 lm3533_led_get_hw_delay(unsigned *delay)
{
	unsigned t;
	u8 val;

	t = *delay * 1000;

	if (t >= (LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY3_TMIN) / 2) {
		t = clamp(t, LM3533_LED_DELAY3_TMIN, LM3533_LED_DELAY3_TMAX);
		val = time_to_val(&t,	LM3533_LED_DELAY3_TMIN,
					LM3533_LED_DELAY3_TSTEP,
					LM3533_LED_DELAY3_VMIN,
					LM3533_LED_DELAY3_VMAX);
	} else if (t >= (LM3533_LED_DELAY1_TMAX + LM3533_LED_DELAY2_TMIN) / 2) {
		t = clamp(t, LM3533_LED_DELAY2_TMIN, LM3533_LED_DELAY2_TMAX);
		val = time_to_val(&t,	LM3533_LED_DELAY2_TMIN,
					LM3533_LED_DELAY2_TSTEP,
					LM3533_LED_DELAY2_VMIN,
					LM3533_LED_DELAY2_VMAX);
	} else {
		t = clamp(t, LM3533_LED_DELAY1_TMIN, LM3533_LED_DELAY1_TMAX);
		val = time_to_val(&t,	LM3533_LED_DELAY1_TMIN,
					LM3533_LED_DELAY1_TSTEP,
					LM3533_LED_DELAY1_VMIN,
					LM3533_LED_DELAY1_VMAX);
	}

	*delay = (t + 500) / 1000;

	return val;
}

/*
 * Set delay register base to *delay (in ms) and update *delay to reflect
 * actual hardware delay used.
 */
static u8 lm3533_led_delay_set(struct lm3533_led *led, u8 base,
							unsigned long *delay)
{
	unsigned t;
	u8 val;
	u8 reg;
	int ret;

	t = (unsigned)*delay;

	/* Delay group 3 is only available for low time (delay off). */
	if (base != LM3533_REG_PATTERN_LOW_TIME_BASE)
		t = min(t, LM3533_LED_DELAY2_TMAX / 1000);

	val = lm3533_led_get_hw_delay(&t);

	dev_dbg(led->cdev.dev, "%s - %lu: %u (0x%02x)\n", __func__,
							*delay, t, val);
	reg = lm3533_led_get_pattern_reg(led, base);
	ret = lm3533_write(led->lm3533, reg, val);
	if (ret)
		dev_err(led->cdev.dev, "failed to set delay (%02x)\n", reg);

	*delay = t;

	return ret;
}

static int lm3533_led_delay_on_set(struct lm3533_led *led, unsigned long *t)
{
	return lm3533_led_delay_set(led, LM3533_REG_PATTERN_HIGH_TIME_BASE, t);
}

static int lm3533_led_delay_off_set(struct lm3533_led *led, unsigned long *t)
{
	return lm3533_led_delay_set(led, LM3533_REG_PATTERN_LOW_TIME_BASE, t);
}

static int lm3533_led_blink_set(struct led_classdev *cdev,
				unsigned long *delay_on,
				unsigned long *delay_off)
{
	struct lm3533_led *led = to_lm3533_led(cdev);
	int ret;

	dev_dbg(led->cdev.dev, "%s - on = %lu, off = %lu\n", __func__,
							*delay_on, *delay_off);

	if (*delay_on > LM3533_LED_DELAY_ON_MAX ||
					*delay_off > LM3533_LED_DELAY_OFF_MAX)
		return -EINVAL;

	if (*delay_on == 0 && *delay_off == 0) {
		*delay_on = 500;
		*delay_off = 500;
	}

	ret = lm3533_led_delay_on_set(led, delay_on);
	if (ret)
		return ret;

	ret = lm3533_led_delay_off_set(led, delay_off);
	if (ret)
		return ret;

	return lm3533_led_pattern_enable(led, 1);
}

static ssize_t show_id(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3533_led *led = to_lm3533_led(led_cdev);

	return scnprintf(buf, PAGE_SIZE, "%d\n", led->id);
}

/*
 * Pattern generator rise/fall times:
 *
 *   0 - 2048 us (default)
 *   1 - 262 ms
 *   2 - 524 ms
 *   3 - 1.049 s
 *   4 - 2.097 s
 *   5 - 4.194 s
 *   6 - 8.389 s
 *   7 - 16.78 s
 */
static ssize_t show_risefalltime(struct device *dev,
					struct device_attribute *attr,
					char *buf, u8 base)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3533_led *led = to_lm3533_led(led_cdev);
	ssize_t ret;
	u8 reg;
	u8 val;

	reg = lm3533_led_get_pattern_reg(led, base);
	ret = lm3533_read(led->lm3533, reg, &val);
	if (ret)
		return ret;

	return scnprintf(buf, PAGE_SIZE, "%x\n", val);
}

static ssize_t show_risetime(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	return show_risefalltime(dev, attr, buf,
					LM3533_REG_PATTERN_RISETIME_BASE);
}

static ssize_t show_falltime(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	return show_risefalltime(dev, attr, buf,
					LM3533_REG_PATTERN_FALLTIME_BASE);
}

static ssize_t store_risefalltime(struct device *dev,
					struct device_attribute *attr,
					const char *buf, size_t len, u8 base)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3533_led *led = to_lm3533_led(led_cdev);
	u8 val;
	u8 reg;
	int ret;

	if (kstrtou8(buf, 0, &val) || val > LM3533_RISEFALLTIME_MAX)
		return -EINVAL;

	reg = lm3533_led_get_pattern_reg(led, base);
	ret = lm3533_write(led->lm3533, reg, val);
	if (ret)
		return ret;

	return len;
}

static ssize_t store_risetime(struct device *dev,
					struct device_attribute *attr,
					const char *buf, size_t len)
{
	return store_risefalltime(dev, attr, buf, len,
					LM3533_REG_PATTERN_RISETIME_BASE);
}

static ssize_t store_falltime(struct device *dev,
					struct device_attribute *attr,
					const char *buf, size_t len)
{
	return store_risefalltime(dev, attr, buf, len,
					LM3533_REG_PATTERN_FALLTIME_BASE);
}

static ssize_t show_als_channel(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3533_led *led = to_lm3533_led(led_cdev);
	unsigned channel;
	u8 reg;
	u8 val;
	int ret;

	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
	ret = lm3533_read(led->lm3533, reg, &val);
	if (ret)
		return ret;

	channel = (val & LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK) + 1;

	return scnprintf(buf, PAGE_SIZE, "%u\n", channel);
}

static ssize_t store_als_channel(struct device *dev,
					struct device_attribute *attr,
					const char *buf, size_t len)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3533_led *led = to_lm3533_led(led_cdev);
	unsigned channel;
	u8 reg;
	u8 val;
	u8 mask;
	int ret;

	if (kstrtouint(buf, 0, &channel))
		return -EINVAL;

	if (channel < LM3533_ALS_CHANNEL_LV_MIN ||
					channel > LM3533_ALS_CHANNEL_LV_MAX)
		return -EINVAL;

	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
	mask = LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK;
	val = channel - 1;

	ret = lm3533_update(led->lm3533, reg, val, mask);
	if (ret)
		return ret;

	return len;
}

static ssize_t show_als_en(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3533_led *led = to_lm3533_led(led_cdev);
	bool enable;
	u8 reg;
	u8 val;
	int ret;

	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
	ret = lm3533_read(led->lm3533, reg, &val);
	if (ret)
		return ret;

	enable = val & LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;

	return scnprintf(buf, PAGE_SIZE, "%d\n", enable);
}

static ssize_t store_als_en(struct device *dev,
					struct device_attribute *attr,
					const char *buf, size_t len)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3533_led *led = to_lm3533_led(led_cdev);
	unsigned enable;
	u8 reg;
	u8 mask;
	u8 val;
	int ret;

	if (kstrtouint(buf, 0, &enable))
		return -EINVAL;

	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
	mask = LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;

	if (enable)
		val = mask;
	else
		val = 0;

	ret = lm3533_update(led->lm3533, reg, val, mask);
	if (ret)
		return ret;

	return len;
}

static ssize_t show_linear(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3533_led *led = to_lm3533_led(led_cdev);
	u8 reg;
	u8 val;
	int linear;
	int ret;

	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
	ret = lm3533_read(led->lm3533, reg, &val);
	if (ret)
		return ret;

	if (val & LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK)
		linear = 1;
	else
		linear = 0;

	return scnprintf(buf, PAGE_SIZE, "%x\n", linear);
}

static ssize_t store_linear(struct device *dev,
					struct device_attribute *attr,
					const char *buf, size_t len)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3533_led *led = to_lm3533_led(led_cdev);
	unsigned long linear;
	u8 reg;
	u8 mask;
	u8 val;
	int ret;

	if (kstrtoul(buf, 0, &linear))
		return -EINVAL;

	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
	mask = LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK;

	if (linear)
		val = mask;
	else
		val = 0;

	ret = lm3533_update(led->lm3533, reg, val, mask);
	if (ret)
		return ret;

	return len;
}

static ssize_t show_pwm(struct device *dev,
					struct device_attribute *attr,
					char *buf)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3533_led *led = to_lm3533_led(led_cdev);
	u8 val;
	int ret;

	ret = lm3533_ctrlbank_get_pwm(&led->cb, &val);
	if (ret)
		return ret;

	return scnprintf(buf, PAGE_SIZE, "%u\n", val);
}

static ssize_t store_pwm(struct device *dev,
					struct device_attribute *attr,
					const char *buf, size_t len)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3533_led *led = to_lm3533_led(led_cdev);
	u8 val;
	int ret;

	if (kstrtou8(buf, 0, &val))
		return -EINVAL;

	ret = lm3533_ctrlbank_set_pwm(&led->cb, val);
	if (ret)
		return ret;

	return len;
}

static LM3533_ATTR_RW(als_channel);
static LM3533_ATTR_RW(als_en);
static LM3533_ATTR_RW(falltime);
static LM3533_ATTR_RO(id);
static LM3533_ATTR_RW(linear);
static LM3533_ATTR_RW(pwm);
static LM3533_ATTR_RW(risetime);

static struct attribute *lm3533_led_attributes[] = {
	&dev_attr_als_channel.attr,
	&dev_attr_als_en.attr,
	&dev_attr_falltime.attr,
	&dev_attr_id.attr,
	&dev_attr_linear.attr,
	&dev_attr_pwm.attr,
	&dev_attr_risetime.attr,
	NULL,
};

static umode_t lm3533_led_attr_is_visible(struct kobject *kobj,
					     struct attribute *attr, int n)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3533_led *led = to_lm3533_led(led_cdev);
	umode_t mode = attr->mode;

	if (attr == &dev_attr_als_channel.attr ||
					attr == &dev_attr_als_en.attr) {
		if (!led->lm3533->have_als)
			mode = 0;
	}

	return mode;
};

static const struct attribute_group lm3533_led_attribute_group = {
	.is_visible	= lm3533_led_attr_is_visible,
	.attrs		= lm3533_led_attributes
};

static const struct attribute_group *lm3533_led_attribute_groups[] = {
	&lm3533_led_attribute_group,
	NULL
};

static int lm3533_led_setup(struct lm3533_led *led,
					struct lm3533_led_platform_data *pdata)
{
	int ret;

	ret = lm3533_ctrlbank_set_max_current(&led->cb, pdata->max_current);
	if (ret)
		return ret;

	return lm3533_ctrlbank_set_pwm(&led->cb, pdata->pwm);
}

static int lm3533_led_probe(struct platform_device *pdev)
{
	struct lm3533 *lm3533;
	struct lm3533_led_platform_data *pdata;
	struct lm3533_led *led;
	int ret;

	dev_dbg(&pdev->dev, "%s\n", __func__);

	lm3533 = dev_get_drvdata(pdev->dev.parent);
	if (!lm3533)
		return -EINVAL;

	pdata = dev_get_platdata(&pdev->dev);
	if (!pdata) {
		dev_err(&pdev->dev, "no platform data\n");
		return -EINVAL;
	}

	if (pdev->id < 0 || pdev->id >= LM3533_LVCTRLBANK_COUNT) {
		dev_err(&pdev->dev, "illegal LED id %d\n", pdev->id);
		return -EINVAL;
	}

	led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
	if (!led)
		return -ENOMEM;

	led->lm3533 = lm3533;
	led->cdev.name = pdata->name;
	led->cdev.default_trigger = pdata->default_trigger;
	led->cdev.brightness_set_blocking = lm3533_led_set;
	led->cdev.brightness_get = lm3533_led_get;
	led->cdev.blink_set = lm3533_led_blink_set;
	led->cdev.brightness = LED_OFF;
	led->cdev.groups = lm3533_led_attribute_groups;
	led->id = pdev->id;

	mutex_init(&led->mutex);

	/* The class framework makes a callback to get brightness during
	 * registration so use parent device (for error reporting) until
	 * registered.
	 */
	led->cb.lm3533 = lm3533;
	led->cb.id = lm3533_led_get_ctrlbank_id(led);
	led->cb.dev = lm3533->dev;

	platform_set_drvdata(pdev, led);

	ret = led_classdev_register(pdev->dev.parent, &led->cdev);
	if (ret) {
		dev_err(&pdev->dev, "failed to register LED %d\n", pdev->id);
		return ret;
	}

	led->cb.dev = led->cdev.dev;

	ret = lm3533_led_setup(led, pdata);
	if (ret)
		goto err_deregister;

	ret = lm3533_ctrlbank_enable(&led->cb);
	if (ret)
		goto err_deregister;

	return 0;

err_deregister:
	led_classdev_unregister(&led->cdev);

	return ret;
}

static int lm3533_led_remove(struct platform_device *pdev)
{
	struct lm3533_led *led = platform_get_drvdata(pdev);

	dev_dbg(&pdev->dev, "%s\n", __func__);

	lm3533_ctrlbank_disable(&led->cb);
	led_classdev_unregister(&led->cdev);

	return 0;
}

static void lm3533_led_shutdown(struct platform_device *pdev)
{

	struct lm3533_led *led = platform_get_drvdata(pdev);

	dev_dbg(&pdev->dev, "%s\n", __func__);

	lm3533_ctrlbank_disable(&led->cb);
	lm3533_led_set(&led->cdev, LED_OFF);		/* disable blink */
}

static struct platform_driver lm3533_led_driver = {
	.driver = {
		.name = "lm3533-leds",
	},
	.probe		= lm3533_led_probe,
	.remove		= lm3533_led_remove,
	.shutdown	= lm3533_led_shutdown,
};
module_platform_driver(lm3533_led_driver);

MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
MODULE_DESCRIPTION("LM3533 LED driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:lm3533-leds");