GNU Linux-libre 5.13.14-gnu1
[releases.git] / drivers / leds / leds-lm3533.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * leds-lm3533.c -- LM3533 LED driver
4  *
5  * Copyright (C) 2011-2012 Texas Instruments
6  *
7  * Author: Johan Hovold <jhovold@gmail.com>
8  */
9
10 #include <linux/module.h>
11 #include <linux/leds.h>
12 #include <linux/mfd/core.h>
13 #include <linux/mutex.h>
14 #include <linux/platform_device.h>
15 #include <linux/slab.h>
16
17 #include <linux/mfd/lm3533.h>
18
19
20 #define LM3533_LVCTRLBANK_MIN           2
21 #define LM3533_LVCTRLBANK_MAX           5
22 #define LM3533_LVCTRLBANK_COUNT         4
23 #define LM3533_RISEFALLTIME_MAX         7
24 #define LM3533_ALS_CHANNEL_LV_MIN       1
25 #define LM3533_ALS_CHANNEL_LV_MAX       2
26
27 #define LM3533_REG_CTRLBANK_BCONF_BASE          0x1b
28 #define LM3533_REG_PATTERN_ENABLE               0x28
29 #define LM3533_REG_PATTERN_LOW_TIME_BASE        0x71
30 #define LM3533_REG_PATTERN_HIGH_TIME_BASE       0x72
31 #define LM3533_REG_PATTERN_RISETIME_BASE        0x74
32 #define LM3533_REG_PATTERN_FALLTIME_BASE        0x75
33
34 #define LM3533_REG_PATTERN_STEP                 0x10
35
36 #define LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK          0x04
37 #define LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK           0x02
38 #define LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK      0x01
39
40 #define LM3533_LED_FLAG_PATTERN_ENABLE          1
41
42
43 struct lm3533_led {
44         struct lm3533 *lm3533;
45         struct lm3533_ctrlbank cb;
46         struct led_classdev cdev;
47         int id;
48
49         struct mutex mutex;
50         unsigned long flags;
51 };
52
53
54 static inline struct lm3533_led *to_lm3533_led(struct led_classdev *cdev)
55 {
56         return container_of(cdev, struct lm3533_led, cdev);
57 }
58
59 static inline int lm3533_led_get_ctrlbank_id(struct lm3533_led *led)
60 {
61         return led->id + 2;
62 }
63
64 static inline u8 lm3533_led_get_lv_reg(struct lm3533_led *led, u8 base)
65 {
66         return base + led->id;
67 }
68
69 static inline u8 lm3533_led_get_pattern(struct lm3533_led *led)
70 {
71         return led->id;
72 }
73
74 static inline u8 lm3533_led_get_pattern_reg(struct lm3533_led *led,
75                                                                 u8 base)
76 {
77         return base + lm3533_led_get_pattern(led) * LM3533_REG_PATTERN_STEP;
78 }
79
80 static int lm3533_led_pattern_enable(struct lm3533_led *led, int enable)
81 {
82         u8 mask;
83         u8 val;
84         int pattern;
85         int state;
86         int ret = 0;
87
88         dev_dbg(led->cdev.dev, "%s - %d\n", __func__, enable);
89
90         mutex_lock(&led->mutex);
91
92         state = test_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
93         if ((enable && state) || (!enable && !state))
94                 goto out;
95
96         pattern = lm3533_led_get_pattern(led);
97         mask = 1 << (2 * pattern);
98
99         if (enable)
100                 val = mask;
101         else
102                 val = 0;
103
104         ret = lm3533_update(led->lm3533, LM3533_REG_PATTERN_ENABLE, val, mask);
105         if (ret) {
106                 dev_err(led->cdev.dev, "failed to enable pattern %d (%d)\n",
107                                                         pattern, enable);
108                 goto out;
109         }
110
111         __change_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
112 out:
113         mutex_unlock(&led->mutex);
114
115         return ret;
116 }
117
118 static int lm3533_led_set(struct led_classdev *cdev,
119                                                 enum led_brightness value)
120 {
121         struct lm3533_led *led = to_lm3533_led(cdev);
122
123         dev_dbg(led->cdev.dev, "%s - %d\n", __func__, value);
124
125         if (value == 0)
126                 lm3533_led_pattern_enable(led, 0);      /* disable blink */
127
128         return lm3533_ctrlbank_set_brightness(&led->cb, value);
129 }
130
131 static enum led_brightness lm3533_led_get(struct led_classdev *cdev)
132 {
133         struct lm3533_led *led = to_lm3533_led(cdev);
134         u8 val;
135         int ret;
136
137         ret = lm3533_ctrlbank_get_brightness(&led->cb, &val);
138         if (ret)
139                 return ret;
140
141         dev_dbg(led->cdev.dev, "%s - %u\n", __func__, val);
142
143         return val;
144 }
145
146 /* Pattern generator defines (delays in us). */
147 #define LM3533_LED_DELAY1_VMIN  0x00
148 #define LM3533_LED_DELAY2_VMIN  0x3d
149 #define LM3533_LED_DELAY3_VMIN  0x80
150
151 #define LM3533_LED_DELAY1_VMAX  (LM3533_LED_DELAY2_VMIN - 1)
152 #define LM3533_LED_DELAY2_VMAX  (LM3533_LED_DELAY3_VMIN - 1)
153 #define LM3533_LED_DELAY3_VMAX  0xff
154
155 #define LM3533_LED_DELAY1_TMIN  16384U
156 #define LM3533_LED_DELAY2_TMIN  1130496U
157 #define LM3533_LED_DELAY3_TMIN  10305536U
158
159 #define LM3533_LED_DELAY1_TMAX  999424U
160 #define LM3533_LED_DELAY2_TMAX  9781248U
161 #define LM3533_LED_DELAY3_TMAX  76890112U
162
163 /* t_step = (t_max - t_min) / (v_max - v_min) */
164 #define LM3533_LED_DELAY1_TSTEP 16384
165 #define LM3533_LED_DELAY2_TSTEP 131072
166 #define LM3533_LED_DELAY3_TSTEP 524288
167
168 /* Delay limits for hardware accelerated blinking (in ms). */
169 #define LM3533_LED_DELAY_ON_MAX \
170         ((LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY2_TSTEP / 2) / 1000)
171 #define LM3533_LED_DELAY_OFF_MAX \
172         ((LM3533_LED_DELAY3_TMAX + LM3533_LED_DELAY3_TSTEP / 2) / 1000)
173
174 /*
175  * Returns linear map of *t from [t_min,t_max] to [v_min,v_max] with a step
176  * size of t_step, where
177  *
178  *      t_step = (t_max - t_min) / (v_max - v_min)
179  *
180  * and updates *t to reflect the mapped value.
181  */
182 static u8 time_to_val(unsigned *t, unsigned t_min, unsigned t_step,
183                                                         u8 v_min, u8 v_max)
184 {
185         unsigned val;
186
187         val = (*t + t_step / 2 - t_min) / t_step + v_min;
188
189         *t = t_step * (val - v_min) + t_min;
190
191         return (u8)val;
192 }
193
194 /*
195  * Returns time code corresponding to *delay (in ms) and updates *delay to
196  * reflect actual hardware delay.
197  *
198  * Hardware supports 256 discrete delay times, divided into three groups with
199  * the following ranges and step-sizes:
200  *
201  *      [   16,   999]  [0x00, 0x3e]    step  16 ms
202  *      [ 1130,  9781]  [0x3d, 0x7f]    step 131 ms
203  *      [10306, 76890]  [0x80, 0xff]    step 524 ms
204  *
205  * Note that delay group 3 is only available for delay_off.
206  */
207 static u8 lm3533_led_get_hw_delay(unsigned *delay)
208 {
209         unsigned t;
210         u8 val;
211
212         t = *delay * 1000;
213
214         if (t >= (LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY3_TMIN) / 2) {
215                 t = clamp(t, LM3533_LED_DELAY3_TMIN, LM3533_LED_DELAY3_TMAX);
216                 val = time_to_val(&t,   LM3533_LED_DELAY3_TMIN,
217                                         LM3533_LED_DELAY3_TSTEP,
218                                         LM3533_LED_DELAY3_VMIN,
219                                         LM3533_LED_DELAY3_VMAX);
220         } else if (t >= (LM3533_LED_DELAY1_TMAX + LM3533_LED_DELAY2_TMIN) / 2) {
221                 t = clamp(t, LM3533_LED_DELAY2_TMIN, LM3533_LED_DELAY2_TMAX);
222                 val = time_to_val(&t,   LM3533_LED_DELAY2_TMIN,
223                                         LM3533_LED_DELAY2_TSTEP,
224                                         LM3533_LED_DELAY2_VMIN,
225                                         LM3533_LED_DELAY2_VMAX);
226         } else {
227                 t = clamp(t, LM3533_LED_DELAY1_TMIN, LM3533_LED_DELAY1_TMAX);
228                 val = time_to_val(&t,   LM3533_LED_DELAY1_TMIN,
229                                         LM3533_LED_DELAY1_TSTEP,
230                                         LM3533_LED_DELAY1_VMIN,
231                                         LM3533_LED_DELAY1_VMAX);
232         }
233
234         *delay = (t + 500) / 1000;
235
236         return val;
237 }
238
239 /*
240  * Set delay register base to *delay (in ms) and update *delay to reflect
241  * actual hardware delay used.
242  */
243 static u8 lm3533_led_delay_set(struct lm3533_led *led, u8 base,
244                                                         unsigned long *delay)
245 {
246         unsigned t;
247         u8 val;
248         u8 reg;
249         int ret;
250
251         t = (unsigned)*delay;
252
253         /* Delay group 3 is only available for low time (delay off). */
254         if (base != LM3533_REG_PATTERN_LOW_TIME_BASE)
255                 t = min(t, LM3533_LED_DELAY2_TMAX / 1000);
256
257         val = lm3533_led_get_hw_delay(&t);
258
259         dev_dbg(led->cdev.dev, "%s - %lu: %u (0x%02x)\n", __func__,
260                                                         *delay, t, val);
261         reg = lm3533_led_get_pattern_reg(led, base);
262         ret = lm3533_write(led->lm3533, reg, val);
263         if (ret)
264                 dev_err(led->cdev.dev, "failed to set delay (%02x)\n", reg);
265
266         *delay = t;
267
268         return ret;
269 }
270
271 static int lm3533_led_delay_on_set(struct lm3533_led *led, unsigned long *t)
272 {
273         return lm3533_led_delay_set(led, LM3533_REG_PATTERN_HIGH_TIME_BASE, t);
274 }
275
276 static int lm3533_led_delay_off_set(struct lm3533_led *led, unsigned long *t)
277 {
278         return lm3533_led_delay_set(led, LM3533_REG_PATTERN_LOW_TIME_BASE, t);
279 }
280
281 static int lm3533_led_blink_set(struct led_classdev *cdev,
282                                 unsigned long *delay_on,
283                                 unsigned long *delay_off)
284 {
285         struct lm3533_led *led = to_lm3533_led(cdev);
286         int ret;
287
288         dev_dbg(led->cdev.dev, "%s - on = %lu, off = %lu\n", __func__,
289                                                         *delay_on, *delay_off);
290
291         if (*delay_on > LM3533_LED_DELAY_ON_MAX ||
292                                         *delay_off > LM3533_LED_DELAY_OFF_MAX)
293                 return -EINVAL;
294
295         if (*delay_on == 0 && *delay_off == 0) {
296                 *delay_on = 500;
297                 *delay_off = 500;
298         }
299
300         ret = lm3533_led_delay_on_set(led, delay_on);
301         if (ret)
302                 return ret;
303
304         ret = lm3533_led_delay_off_set(led, delay_off);
305         if (ret)
306                 return ret;
307
308         return lm3533_led_pattern_enable(led, 1);
309 }
310
311 static ssize_t show_id(struct device *dev,
312                                 struct device_attribute *attr, char *buf)
313 {
314         struct led_classdev *led_cdev = dev_get_drvdata(dev);
315         struct lm3533_led *led = to_lm3533_led(led_cdev);
316
317         return scnprintf(buf, PAGE_SIZE, "%d\n", led->id);
318 }
319
320 /*
321  * Pattern generator rise/fall times:
322  *
323  *   0 - 2048 us (default)
324  *   1 - 262 ms
325  *   2 - 524 ms
326  *   3 - 1.049 s
327  *   4 - 2.097 s
328  *   5 - 4.194 s
329  *   6 - 8.389 s
330  *   7 - 16.78 s
331  */
332 static ssize_t show_risefalltime(struct device *dev,
333                                         struct device_attribute *attr,
334                                         char *buf, u8 base)
335 {
336         struct led_classdev *led_cdev = dev_get_drvdata(dev);
337         struct lm3533_led *led = to_lm3533_led(led_cdev);
338         ssize_t ret;
339         u8 reg;
340         u8 val;
341
342         reg = lm3533_led_get_pattern_reg(led, base);
343         ret = lm3533_read(led->lm3533, reg, &val);
344         if (ret)
345                 return ret;
346
347         return scnprintf(buf, PAGE_SIZE, "%x\n", val);
348 }
349
350 static ssize_t show_risetime(struct device *dev,
351                                 struct device_attribute *attr, char *buf)
352 {
353         return show_risefalltime(dev, attr, buf,
354                                         LM3533_REG_PATTERN_RISETIME_BASE);
355 }
356
357 static ssize_t show_falltime(struct device *dev,
358                                 struct device_attribute *attr, char *buf)
359 {
360         return show_risefalltime(dev, attr, buf,
361                                         LM3533_REG_PATTERN_FALLTIME_BASE);
362 }
363
364 static ssize_t store_risefalltime(struct device *dev,
365                                         struct device_attribute *attr,
366                                         const char *buf, size_t len, u8 base)
367 {
368         struct led_classdev *led_cdev = dev_get_drvdata(dev);
369         struct lm3533_led *led = to_lm3533_led(led_cdev);
370         u8 val;
371         u8 reg;
372         int ret;
373
374         if (kstrtou8(buf, 0, &val) || val > LM3533_RISEFALLTIME_MAX)
375                 return -EINVAL;
376
377         reg = lm3533_led_get_pattern_reg(led, base);
378         ret = lm3533_write(led->lm3533, reg, val);
379         if (ret)
380                 return ret;
381
382         return len;
383 }
384
385 static ssize_t store_risetime(struct device *dev,
386                                         struct device_attribute *attr,
387                                         const char *buf, size_t len)
388 {
389         return store_risefalltime(dev, attr, buf, len,
390                                         LM3533_REG_PATTERN_RISETIME_BASE);
391 }
392
393 static ssize_t store_falltime(struct device *dev,
394                                         struct device_attribute *attr,
395                                         const char *buf, size_t len)
396 {
397         return store_risefalltime(dev, attr, buf, len,
398                                         LM3533_REG_PATTERN_FALLTIME_BASE);
399 }
400
401 static ssize_t show_als_channel(struct device *dev,
402                                 struct device_attribute *attr, char *buf)
403 {
404         struct led_classdev *led_cdev = dev_get_drvdata(dev);
405         struct lm3533_led *led = to_lm3533_led(led_cdev);
406         unsigned channel;
407         u8 reg;
408         u8 val;
409         int ret;
410
411         reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
412         ret = lm3533_read(led->lm3533, reg, &val);
413         if (ret)
414                 return ret;
415
416         channel = (val & LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK) + 1;
417
418         return scnprintf(buf, PAGE_SIZE, "%u\n", channel);
419 }
420
421 static ssize_t store_als_channel(struct device *dev,
422                                         struct device_attribute *attr,
423                                         const char *buf, size_t len)
424 {
425         struct led_classdev *led_cdev = dev_get_drvdata(dev);
426         struct lm3533_led *led = to_lm3533_led(led_cdev);
427         unsigned channel;
428         u8 reg;
429         u8 val;
430         u8 mask;
431         int ret;
432
433         if (kstrtouint(buf, 0, &channel))
434                 return -EINVAL;
435
436         if (channel < LM3533_ALS_CHANNEL_LV_MIN ||
437                                         channel > LM3533_ALS_CHANNEL_LV_MAX)
438                 return -EINVAL;
439
440         reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
441         mask = LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK;
442         val = channel - 1;
443
444         ret = lm3533_update(led->lm3533, reg, val, mask);
445         if (ret)
446                 return ret;
447
448         return len;
449 }
450
451 static ssize_t show_als_en(struct device *dev,
452                                 struct device_attribute *attr, char *buf)
453 {
454         struct led_classdev *led_cdev = dev_get_drvdata(dev);
455         struct lm3533_led *led = to_lm3533_led(led_cdev);
456         bool enable;
457         u8 reg;
458         u8 val;
459         int ret;
460
461         reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
462         ret = lm3533_read(led->lm3533, reg, &val);
463         if (ret)
464                 return ret;
465
466         enable = val & LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;
467
468         return scnprintf(buf, PAGE_SIZE, "%d\n", enable);
469 }
470
471 static ssize_t store_als_en(struct device *dev,
472                                         struct device_attribute *attr,
473                                         const char *buf, size_t len)
474 {
475         struct led_classdev *led_cdev = dev_get_drvdata(dev);
476         struct lm3533_led *led = to_lm3533_led(led_cdev);
477         unsigned enable;
478         u8 reg;
479         u8 mask;
480         u8 val;
481         int ret;
482
483         if (kstrtouint(buf, 0, &enable))
484                 return -EINVAL;
485
486         reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
487         mask = LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;
488
489         if (enable)
490                 val = mask;
491         else
492                 val = 0;
493
494         ret = lm3533_update(led->lm3533, reg, val, mask);
495         if (ret)
496                 return ret;
497
498         return len;
499 }
500
501 static ssize_t show_linear(struct device *dev,
502                                 struct device_attribute *attr, char *buf)
503 {
504         struct led_classdev *led_cdev = dev_get_drvdata(dev);
505         struct lm3533_led *led = to_lm3533_led(led_cdev);
506         u8 reg;
507         u8 val;
508         int linear;
509         int ret;
510
511         reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
512         ret = lm3533_read(led->lm3533, reg, &val);
513         if (ret)
514                 return ret;
515
516         if (val & LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK)
517                 linear = 1;
518         else
519                 linear = 0;
520
521         return scnprintf(buf, PAGE_SIZE, "%x\n", linear);
522 }
523
524 static ssize_t store_linear(struct device *dev,
525                                         struct device_attribute *attr,
526                                         const char *buf, size_t len)
527 {
528         struct led_classdev *led_cdev = dev_get_drvdata(dev);
529         struct lm3533_led *led = to_lm3533_led(led_cdev);
530         unsigned long linear;
531         u8 reg;
532         u8 mask;
533         u8 val;
534         int ret;
535
536         if (kstrtoul(buf, 0, &linear))
537                 return -EINVAL;
538
539         reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
540         mask = LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK;
541
542         if (linear)
543                 val = mask;
544         else
545                 val = 0;
546
547         ret = lm3533_update(led->lm3533, reg, val, mask);
548         if (ret)
549                 return ret;
550
551         return len;
552 }
553
554 static ssize_t show_pwm(struct device *dev,
555                                         struct device_attribute *attr,
556                                         char *buf)
557 {
558         struct led_classdev *led_cdev = dev_get_drvdata(dev);
559         struct lm3533_led *led = to_lm3533_led(led_cdev);
560         u8 val;
561         int ret;
562
563         ret = lm3533_ctrlbank_get_pwm(&led->cb, &val);
564         if (ret)
565                 return ret;
566
567         return scnprintf(buf, PAGE_SIZE, "%u\n", val);
568 }
569
570 static ssize_t store_pwm(struct device *dev,
571                                         struct device_attribute *attr,
572                                         const char *buf, size_t len)
573 {
574         struct led_classdev *led_cdev = dev_get_drvdata(dev);
575         struct lm3533_led *led = to_lm3533_led(led_cdev);
576         u8 val;
577         int ret;
578
579         if (kstrtou8(buf, 0, &val))
580                 return -EINVAL;
581
582         ret = lm3533_ctrlbank_set_pwm(&led->cb, val);
583         if (ret)
584                 return ret;
585
586         return len;
587 }
588
589 static LM3533_ATTR_RW(als_channel);
590 static LM3533_ATTR_RW(als_en);
591 static LM3533_ATTR_RW(falltime);
592 static LM3533_ATTR_RO(id);
593 static LM3533_ATTR_RW(linear);
594 static LM3533_ATTR_RW(pwm);
595 static LM3533_ATTR_RW(risetime);
596
597 static struct attribute *lm3533_led_attributes[] = {
598         &dev_attr_als_channel.attr,
599         &dev_attr_als_en.attr,
600         &dev_attr_falltime.attr,
601         &dev_attr_id.attr,
602         &dev_attr_linear.attr,
603         &dev_attr_pwm.attr,
604         &dev_attr_risetime.attr,
605         NULL,
606 };
607
608 static umode_t lm3533_led_attr_is_visible(struct kobject *kobj,
609                                              struct attribute *attr, int n)
610 {
611         struct device *dev = kobj_to_dev(kobj);
612         struct led_classdev *led_cdev = dev_get_drvdata(dev);
613         struct lm3533_led *led = to_lm3533_led(led_cdev);
614         umode_t mode = attr->mode;
615
616         if (attr == &dev_attr_als_channel.attr ||
617                                         attr == &dev_attr_als_en.attr) {
618                 if (!led->lm3533->have_als)
619                         mode = 0;
620         }
621
622         return mode;
623 };
624
625 static const struct attribute_group lm3533_led_attribute_group = {
626         .is_visible     = lm3533_led_attr_is_visible,
627         .attrs          = lm3533_led_attributes
628 };
629
630 static const struct attribute_group *lm3533_led_attribute_groups[] = {
631         &lm3533_led_attribute_group,
632         NULL
633 };
634
635 static int lm3533_led_setup(struct lm3533_led *led,
636                                         struct lm3533_led_platform_data *pdata)
637 {
638         int ret;
639
640         ret = lm3533_ctrlbank_set_max_current(&led->cb, pdata->max_current);
641         if (ret)
642                 return ret;
643
644         return lm3533_ctrlbank_set_pwm(&led->cb, pdata->pwm);
645 }
646
647 static int lm3533_led_probe(struct platform_device *pdev)
648 {
649         struct lm3533 *lm3533;
650         struct lm3533_led_platform_data *pdata;
651         struct lm3533_led *led;
652         int ret;
653
654         dev_dbg(&pdev->dev, "%s\n", __func__);
655
656         lm3533 = dev_get_drvdata(pdev->dev.parent);
657         if (!lm3533)
658                 return -EINVAL;
659
660         pdata = dev_get_platdata(&pdev->dev);
661         if (!pdata) {
662                 dev_err(&pdev->dev, "no platform data\n");
663                 return -EINVAL;
664         }
665
666         if (pdev->id < 0 || pdev->id >= LM3533_LVCTRLBANK_COUNT) {
667                 dev_err(&pdev->dev, "illegal LED id %d\n", pdev->id);
668                 return -EINVAL;
669         }
670
671         led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
672         if (!led)
673                 return -ENOMEM;
674
675         led->lm3533 = lm3533;
676         led->cdev.name = pdata->name;
677         led->cdev.default_trigger = pdata->default_trigger;
678         led->cdev.brightness_set_blocking = lm3533_led_set;
679         led->cdev.brightness_get = lm3533_led_get;
680         led->cdev.blink_set = lm3533_led_blink_set;
681         led->cdev.brightness = LED_OFF;
682         led->cdev.groups = lm3533_led_attribute_groups;
683         led->id = pdev->id;
684
685         mutex_init(&led->mutex);
686
687         /* The class framework makes a callback to get brightness during
688          * registration so use parent device (for error reporting) until
689          * registered.
690          */
691         led->cb.lm3533 = lm3533;
692         led->cb.id = lm3533_led_get_ctrlbank_id(led);
693         led->cb.dev = lm3533->dev;
694
695         platform_set_drvdata(pdev, led);
696
697         ret = led_classdev_register(pdev->dev.parent, &led->cdev);
698         if (ret) {
699                 dev_err(&pdev->dev, "failed to register LED %d\n", pdev->id);
700                 return ret;
701         }
702
703         led->cb.dev = led->cdev.dev;
704
705         ret = lm3533_led_setup(led, pdata);
706         if (ret)
707                 goto err_deregister;
708
709         ret = lm3533_ctrlbank_enable(&led->cb);
710         if (ret)
711                 goto err_deregister;
712
713         return 0;
714
715 err_deregister:
716         led_classdev_unregister(&led->cdev);
717
718         return ret;
719 }
720
721 static int lm3533_led_remove(struct platform_device *pdev)
722 {
723         struct lm3533_led *led = platform_get_drvdata(pdev);
724
725         dev_dbg(&pdev->dev, "%s\n", __func__);
726
727         lm3533_ctrlbank_disable(&led->cb);
728         led_classdev_unregister(&led->cdev);
729
730         return 0;
731 }
732
733 static void lm3533_led_shutdown(struct platform_device *pdev)
734 {
735
736         struct lm3533_led *led = platform_get_drvdata(pdev);
737
738         dev_dbg(&pdev->dev, "%s\n", __func__);
739
740         lm3533_ctrlbank_disable(&led->cb);
741         lm3533_led_set(&led->cdev, LED_OFF);            /* disable blink */
742 }
743
744 static struct platform_driver lm3533_led_driver = {
745         .driver = {
746                 .name = "lm3533-leds",
747         },
748         .probe          = lm3533_led_probe,
749         .remove         = lm3533_led_remove,
750         .shutdown       = lm3533_led_shutdown,
751 };
752 module_platform_driver(lm3533_led_driver);
753
754 MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
755 MODULE_DESCRIPTION("LM3533 LED driver");
756 MODULE_LICENSE("GPL");
757 MODULE_ALIAS("platform:lm3533-leds");