Loading...
1/*
2 * leds-lm3533.c -- LM3533 LED driver
3 *
4 * Copyright (C) 2011-2012 Texas Instruments
5 *
6 * Author: Johan Hovold <jhovold@gmail.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 */
13
14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/leds.h>
17#include <linux/mfd/core.h>
18#include <linux/mutex.h>
19#include <linux/platform_device.h>
20#include <linux/slab.h>
21#include <linux/workqueue.h>
22
23#include <linux/mfd/lm3533.h>
24
25
26#define LM3533_LVCTRLBANK_MIN 2
27#define LM3533_LVCTRLBANK_MAX 5
28#define LM3533_LVCTRLBANK_COUNT 4
29#define LM3533_RISEFALLTIME_MAX 7
30#define LM3533_ALS_CHANNEL_LV_MIN 1
31#define LM3533_ALS_CHANNEL_LV_MAX 2
32
33#define LM3533_REG_CTRLBANK_BCONF_BASE 0x1b
34#define LM3533_REG_PATTERN_ENABLE 0x28
35#define LM3533_REG_PATTERN_LOW_TIME_BASE 0x71
36#define LM3533_REG_PATTERN_HIGH_TIME_BASE 0x72
37#define LM3533_REG_PATTERN_RISETIME_BASE 0x74
38#define LM3533_REG_PATTERN_FALLTIME_BASE 0x75
39
40#define LM3533_REG_PATTERN_STEP 0x10
41
42#define LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK 0x04
43#define LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK 0x02
44#define LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK 0x01
45
46#define LM3533_LED_FLAG_PATTERN_ENABLE 1
47
48
49struct lm3533_led {
50 struct lm3533 *lm3533;
51 struct lm3533_ctrlbank cb;
52 struct led_classdev cdev;
53 int id;
54
55 struct mutex mutex;
56 unsigned long flags;
57
58 struct work_struct work;
59 u8 new_brightness;
60};
61
62
63static inline struct lm3533_led *to_lm3533_led(struct led_classdev *cdev)
64{
65 return container_of(cdev, struct lm3533_led, cdev);
66}
67
68static inline int lm3533_led_get_ctrlbank_id(struct lm3533_led *led)
69{
70 return led->id + 2;
71}
72
73static inline u8 lm3533_led_get_lv_reg(struct lm3533_led *led, u8 base)
74{
75 return base + led->id;
76}
77
78static inline u8 lm3533_led_get_pattern(struct lm3533_led *led)
79{
80 return led->id;
81}
82
83static inline u8 lm3533_led_get_pattern_reg(struct lm3533_led *led,
84 u8 base)
85{
86 return base + lm3533_led_get_pattern(led) * LM3533_REG_PATTERN_STEP;
87}
88
89static int lm3533_led_pattern_enable(struct lm3533_led *led, int enable)
90{
91 u8 mask;
92 u8 val;
93 int pattern;
94 int state;
95 int ret = 0;
96
97 dev_dbg(led->cdev.dev, "%s - %d\n", __func__, enable);
98
99 mutex_lock(&led->mutex);
100
101 state = test_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
102 if ((enable && state) || (!enable && !state))
103 goto out;
104
105 pattern = lm3533_led_get_pattern(led);
106 mask = 1 << (2 * pattern);
107
108 if (enable)
109 val = mask;
110 else
111 val = 0;
112
113 ret = lm3533_update(led->lm3533, LM3533_REG_PATTERN_ENABLE, val, mask);
114 if (ret) {
115 dev_err(led->cdev.dev, "failed to enable pattern %d (%d)\n",
116 pattern, enable);
117 goto out;
118 }
119
120 __change_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
121out:
122 mutex_unlock(&led->mutex);
123
124 return ret;
125}
126
127static void lm3533_led_work(struct work_struct *work)
128{
129 struct lm3533_led *led = container_of(work, struct lm3533_led, work);
130
131 dev_dbg(led->cdev.dev, "%s - %u\n", __func__, led->new_brightness);
132
133 if (led->new_brightness == 0)
134 lm3533_led_pattern_enable(led, 0); /* disable blink */
135
136 lm3533_ctrlbank_set_brightness(&led->cb, led->new_brightness);
137}
138
139static void lm3533_led_set(struct led_classdev *cdev,
140 enum led_brightness value)
141{
142 struct lm3533_led *led = to_lm3533_led(cdev);
143
144 dev_dbg(led->cdev.dev, "%s - %d\n", __func__, value);
145
146 led->new_brightness = value;
147 schedule_work(&led->work);
148}
149
150static enum led_brightness lm3533_led_get(struct led_classdev *cdev)
151{
152 struct lm3533_led *led = to_lm3533_led(cdev);
153 u8 val;
154 int ret;
155
156 ret = lm3533_ctrlbank_get_brightness(&led->cb, &val);
157 if (ret)
158 return ret;
159
160 dev_dbg(led->cdev.dev, "%s - %u\n", __func__, val);
161
162 return val;
163}
164
165/* Pattern generator defines (delays in us). */
166#define LM3533_LED_DELAY1_VMIN 0x00
167#define LM3533_LED_DELAY2_VMIN 0x3d
168#define LM3533_LED_DELAY3_VMIN 0x80
169
170#define LM3533_LED_DELAY1_VMAX (LM3533_LED_DELAY2_VMIN - 1)
171#define LM3533_LED_DELAY2_VMAX (LM3533_LED_DELAY3_VMIN - 1)
172#define LM3533_LED_DELAY3_VMAX 0xff
173
174#define LM3533_LED_DELAY1_TMIN 16384U
175#define LM3533_LED_DELAY2_TMIN 1130496U
176#define LM3533_LED_DELAY3_TMIN 10305536U
177
178#define LM3533_LED_DELAY1_TMAX 999424U
179#define LM3533_LED_DELAY2_TMAX 9781248U
180#define LM3533_LED_DELAY3_TMAX 76890112U
181
182/* t_step = (t_max - t_min) / (v_max - v_min) */
183#define LM3533_LED_DELAY1_TSTEP 16384
184#define LM3533_LED_DELAY2_TSTEP 131072
185#define LM3533_LED_DELAY3_TSTEP 524288
186
187/* Delay limits for hardware accelerated blinking (in ms). */
188#define LM3533_LED_DELAY_ON_MAX \
189 ((LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY2_TSTEP / 2) / 1000)
190#define LM3533_LED_DELAY_OFF_MAX \
191 ((LM3533_LED_DELAY3_TMAX + LM3533_LED_DELAY3_TSTEP / 2) / 1000)
192
193/*
194 * Returns linear map of *t from [t_min,t_max] to [v_min,v_max] with a step
195 * size of t_step, where
196 *
197 * t_step = (t_max - t_min) / (v_max - v_min)
198 *
199 * and updates *t to reflect the mapped value.
200 */
201static u8 time_to_val(unsigned *t, unsigned t_min, unsigned t_step,
202 u8 v_min, u8 v_max)
203{
204 unsigned val;
205
206 val = (*t + t_step / 2 - t_min) / t_step + v_min;
207
208 *t = t_step * (val - v_min) + t_min;
209
210 return (u8)val;
211}
212
213/*
214 * Returns time code corresponding to *delay (in ms) and updates *delay to
215 * reflect actual hardware delay.
216 *
217 * Hardware supports 256 discrete delay times, divided into three groups with
218 * the following ranges and step-sizes:
219 *
220 * [ 16, 999] [0x00, 0x3e] step 16 ms
221 * [ 1130, 9781] [0x3d, 0x7f] step 131 ms
222 * [10306, 76890] [0x80, 0xff] step 524 ms
223 *
224 * Note that delay group 3 is only available for delay_off.
225 */
226static u8 lm3533_led_get_hw_delay(unsigned *delay)
227{
228 unsigned t;
229 u8 val;
230
231 t = *delay * 1000;
232
233 if (t >= (LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY3_TMIN) / 2) {
234 t = clamp(t, LM3533_LED_DELAY3_TMIN, LM3533_LED_DELAY3_TMAX);
235 val = time_to_val(&t, LM3533_LED_DELAY3_TMIN,
236 LM3533_LED_DELAY3_TSTEP,
237 LM3533_LED_DELAY3_VMIN,
238 LM3533_LED_DELAY3_VMAX);
239 } else if (t >= (LM3533_LED_DELAY1_TMAX + LM3533_LED_DELAY2_TMIN) / 2) {
240 t = clamp(t, LM3533_LED_DELAY2_TMIN, LM3533_LED_DELAY2_TMAX);
241 val = time_to_val(&t, LM3533_LED_DELAY2_TMIN,
242 LM3533_LED_DELAY2_TSTEP,
243 LM3533_LED_DELAY2_VMIN,
244 LM3533_LED_DELAY2_VMAX);
245 } else {
246 t = clamp(t, LM3533_LED_DELAY1_TMIN, LM3533_LED_DELAY1_TMAX);
247 val = time_to_val(&t, LM3533_LED_DELAY1_TMIN,
248 LM3533_LED_DELAY1_TSTEP,
249 LM3533_LED_DELAY1_VMIN,
250 LM3533_LED_DELAY1_VMAX);
251 }
252
253 *delay = (t + 500) / 1000;
254
255 return val;
256}
257
258/*
259 * Set delay register base to *delay (in ms) and update *delay to reflect
260 * actual hardware delay used.
261 */
262static u8 lm3533_led_delay_set(struct lm3533_led *led, u8 base,
263 unsigned long *delay)
264{
265 unsigned t;
266 u8 val;
267 u8 reg;
268 int ret;
269
270 t = (unsigned)*delay;
271
272 /* Delay group 3 is only available for low time (delay off). */
273 if (base != LM3533_REG_PATTERN_LOW_TIME_BASE)
274 t = min(t, LM3533_LED_DELAY2_TMAX / 1000);
275
276 val = lm3533_led_get_hw_delay(&t);
277
278 dev_dbg(led->cdev.dev, "%s - %lu: %u (0x%02x)\n", __func__,
279 *delay, t, val);
280 reg = lm3533_led_get_pattern_reg(led, base);
281 ret = lm3533_write(led->lm3533, reg, val);
282 if (ret)
283 dev_err(led->cdev.dev, "failed to set delay (%02x)\n", reg);
284
285 *delay = t;
286
287 return ret;
288}
289
290static int lm3533_led_delay_on_set(struct lm3533_led *led, unsigned long *t)
291{
292 return lm3533_led_delay_set(led, LM3533_REG_PATTERN_HIGH_TIME_BASE, t);
293}
294
295static int lm3533_led_delay_off_set(struct lm3533_led *led, unsigned long *t)
296{
297 return lm3533_led_delay_set(led, LM3533_REG_PATTERN_LOW_TIME_BASE, t);
298}
299
300static int lm3533_led_blink_set(struct led_classdev *cdev,
301 unsigned long *delay_on,
302 unsigned long *delay_off)
303{
304 struct lm3533_led *led = to_lm3533_led(cdev);
305 int ret;
306
307 dev_dbg(led->cdev.dev, "%s - on = %lu, off = %lu\n", __func__,
308 *delay_on, *delay_off);
309
310 if (*delay_on > LM3533_LED_DELAY_ON_MAX ||
311 *delay_off > LM3533_LED_DELAY_OFF_MAX)
312 return -EINVAL;
313
314 if (*delay_on == 0 && *delay_off == 0) {
315 *delay_on = 500;
316 *delay_off = 500;
317 }
318
319 ret = lm3533_led_delay_on_set(led, delay_on);
320 if (ret)
321 return ret;
322
323 ret = lm3533_led_delay_off_set(led, delay_off);
324 if (ret)
325 return ret;
326
327 return lm3533_led_pattern_enable(led, 1);
328}
329
330static ssize_t show_id(struct device *dev,
331 struct device_attribute *attr, char *buf)
332{
333 struct led_classdev *led_cdev = dev_get_drvdata(dev);
334 struct lm3533_led *led = to_lm3533_led(led_cdev);
335
336 return scnprintf(buf, PAGE_SIZE, "%d\n", led->id);
337}
338
339/*
340 * Pattern generator rise/fall times:
341 *
342 * 0 - 2048 us (default)
343 * 1 - 262 ms
344 * 2 - 524 ms
345 * 3 - 1.049 s
346 * 4 - 2.097 s
347 * 5 - 4.194 s
348 * 6 - 8.389 s
349 * 7 - 16.78 s
350 */
351static ssize_t show_risefalltime(struct device *dev,
352 struct device_attribute *attr,
353 char *buf, u8 base)
354{
355 struct led_classdev *led_cdev = dev_get_drvdata(dev);
356 struct lm3533_led *led = to_lm3533_led(led_cdev);
357 ssize_t ret;
358 u8 reg;
359 u8 val;
360
361 reg = lm3533_led_get_pattern_reg(led, base);
362 ret = lm3533_read(led->lm3533, reg, &val);
363 if (ret)
364 return ret;
365
366 return scnprintf(buf, PAGE_SIZE, "%x\n", val);
367}
368
369static ssize_t show_risetime(struct device *dev,
370 struct device_attribute *attr, char *buf)
371{
372 return show_risefalltime(dev, attr, buf,
373 LM3533_REG_PATTERN_RISETIME_BASE);
374}
375
376static ssize_t show_falltime(struct device *dev,
377 struct device_attribute *attr, char *buf)
378{
379 return show_risefalltime(dev, attr, buf,
380 LM3533_REG_PATTERN_FALLTIME_BASE);
381}
382
383static ssize_t store_risefalltime(struct device *dev,
384 struct device_attribute *attr,
385 const char *buf, size_t len, u8 base)
386{
387 struct led_classdev *led_cdev = dev_get_drvdata(dev);
388 struct lm3533_led *led = to_lm3533_led(led_cdev);
389 u8 val;
390 u8 reg;
391 int ret;
392
393 if (kstrtou8(buf, 0, &val) || val > LM3533_RISEFALLTIME_MAX)
394 return -EINVAL;
395
396 reg = lm3533_led_get_pattern_reg(led, base);
397 ret = lm3533_write(led->lm3533, reg, val);
398 if (ret)
399 return ret;
400
401 return len;
402}
403
404static ssize_t store_risetime(struct device *dev,
405 struct device_attribute *attr,
406 const char *buf, size_t len)
407{
408 return store_risefalltime(dev, attr, buf, len,
409 LM3533_REG_PATTERN_RISETIME_BASE);
410}
411
412static ssize_t store_falltime(struct device *dev,
413 struct device_attribute *attr,
414 const char *buf, size_t len)
415{
416 return store_risefalltime(dev, attr, buf, len,
417 LM3533_REG_PATTERN_FALLTIME_BASE);
418}
419
420static ssize_t show_als_channel(struct device *dev,
421 struct device_attribute *attr, char *buf)
422{
423 struct led_classdev *led_cdev = dev_get_drvdata(dev);
424 struct lm3533_led *led = to_lm3533_led(led_cdev);
425 unsigned channel;
426 u8 reg;
427 u8 val;
428 int ret;
429
430 reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
431 ret = lm3533_read(led->lm3533, reg, &val);
432 if (ret)
433 return ret;
434
435 channel = (val & LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK) + 1;
436
437 return scnprintf(buf, PAGE_SIZE, "%u\n", channel);
438}
439
440static ssize_t store_als_channel(struct device *dev,
441 struct device_attribute *attr,
442 const char *buf, size_t len)
443{
444 struct led_classdev *led_cdev = dev_get_drvdata(dev);
445 struct lm3533_led *led = to_lm3533_led(led_cdev);
446 unsigned channel;
447 u8 reg;
448 u8 val;
449 u8 mask;
450 int ret;
451
452 if (kstrtouint(buf, 0, &channel))
453 return -EINVAL;
454
455 if (channel < LM3533_ALS_CHANNEL_LV_MIN ||
456 channel > LM3533_ALS_CHANNEL_LV_MAX)
457 return -EINVAL;
458
459 reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
460 mask = LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK;
461 val = channel - 1;
462
463 ret = lm3533_update(led->lm3533, reg, val, mask);
464 if (ret)
465 return ret;
466
467 return len;
468}
469
470static ssize_t show_als_en(struct device *dev,
471 struct device_attribute *attr, char *buf)
472{
473 struct led_classdev *led_cdev = dev_get_drvdata(dev);
474 struct lm3533_led *led = to_lm3533_led(led_cdev);
475 bool enable;
476 u8 reg;
477 u8 val;
478 int ret;
479
480 reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
481 ret = lm3533_read(led->lm3533, reg, &val);
482 if (ret)
483 return ret;
484
485 enable = val & LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;
486
487 return scnprintf(buf, PAGE_SIZE, "%d\n", enable);
488}
489
490static ssize_t store_als_en(struct device *dev,
491 struct device_attribute *attr,
492 const char *buf, size_t len)
493{
494 struct led_classdev *led_cdev = dev_get_drvdata(dev);
495 struct lm3533_led *led = to_lm3533_led(led_cdev);
496 unsigned enable;
497 u8 reg;
498 u8 mask;
499 u8 val;
500 int ret;
501
502 if (kstrtouint(buf, 0, &enable))
503 return -EINVAL;
504
505 reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
506 mask = LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;
507
508 if (enable)
509 val = mask;
510 else
511 val = 0;
512
513 ret = lm3533_update(led->lm3533, reg, val, mask);
514 if (ret)
515 return ret;
516
517 return len;
518}
519
520static ssize_t show_linear(struct device *dev,
521 struct device_attribute *attr, char *buf)
522{
523 struct led_classdev *led_cdev = dev_get_drvdata(dev);
524 struct lm3533_led *led = to_lm3533_led(led_cdev);
525 u8 reg;
526 u8 val;
527 int linear;
528 int ret;
529
530 reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
531 ret = lm3533_read(led->lm3533, reg, &val);
532 if (ret)
533 return ret;
534
535 if (val & LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK)
536 linear = 1;
537 else
538 linear = 0;
539
540 return scnprintf(buf, PAGE_SIZE, "%x\n", linear);
541}
542
543static ssize_t store_linear(struct device *dev,
544 struct device_attribute *attr,
545 const char *buf, size_t len)
546{
547 struct led_classdev *led_cdev = dev_get_drvdata(dev);
548 struct lm3533_led *led = to_lm3533_led(led_cdev);
549 unsigned long linear;
550 u8 reg;
551 u8 mask;
552 u8 val;
553 int ret;
554
555 if (kstrtoul(buf, 0, &linear))
556 return -EINVAL;
557
558 reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
559 mask = LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK;
560
561 if (linear)
562 val = mask;
563 else
564 val = 0;
565
566 ret = lm3533_update(led->lm3533, reg, val, mask);
567 if (ret)
568 return ret;
569
570 return len;
571}
572
573static ssize_t show_pwm(struct device *dev,
574 struct device_attribute *attr,
575 char *buf)
576{
577 struct led_classdev *led_cdev = dev_get_drvdata(dev);
578 struct lm3533_led *led = to_lm3533_led(led_cdev);
579 u8 val;
580 int ret;
581
582 ret = lm3533_ctrlbank_get_pwm(&led->cb, &val);
583 if (ret)
584 return ret;
585
586 return scnprintf(buf, PAGE_SIZE, "%u\n", val);
587}
588
589static ssize_t store_pwm(struct device *dev,
590 struct device_attribute *attr,
591 const char *buf, size_t len)
592{
593 struct led_classdev *led_cdev = dev_get_drvdata(dev);
594 struct lm3533_led *led = to_lm3533_led(led_cdev);
595 u8 val;
596 int ret;
597
598 if (kstrtou8(buf, 0, &val))
599 return -EINVAL;
600
601 ret = lm3533_ctrlbank_set_pwm(&led->cb, val);
602 if (ret)
603 return ret;
604
605 return len;
606}
607
608static LM3533_ATTR_RW(als_channel);
609static LM3533_ATTR_RW(als_en);
610static LM3533_ATTR_RW(falltime);
611static LM3533_ATTR_RO(id);
612static LM3533_ATTR_RW(linear);
613static LM3533_ATTR_RW(pwm);
614static LM3533_ATTR_RW(risetime);
615
616static struct attribute *lm3533_led_attributes[] = {
617 &dev_attr_als_channel.attr,
618 &dev_attr_als_en.attr,
619 &dev_attr_falltime.attr,
620 &dev_attr_id.attr,
621 &dev_attr_linear.attr,
622 &dev_attr_pwm.attr,
623 &dev_attr_risetime.attr,
624 NULL,
625};
626
627static umode_t lm3533_led_attr_is_visible(struct kobject *kobj,
628 struct attribute *attr, int n)
629{
630 struct device *dev = container_of(kobj, struct device, kobj);
631 struct led_classdev *led_cdev = dev_get_drvdata(dev);
632 struct lm3533_led *led = to_lm3533_led(led_cdev);
633 umode_t mode = attr->mode;
634
635 if (attr == &dev_attr_als_channel.attr ||
636 attr == &dev_attr_als_en.attr) {
637 if (!led->lm3533->have_als)
638 mode = 0;
639 }
640
641 return mode;
642};
643
644static struct attribute_group lm3533_led_attribute_group = {
645 .is_visible = lm3533_led_attr_is_visible,
646 .attrs = lm3533_led_attributes
647};
648
649static int __devinit lm3533_led_setup(struct lm3533_led *led,
650 struct lm3533_led_platform_data *pdata)
651{
652 int ret;
653
654 ret = lm3533_ctrlbank_set_max_current(&led->cb, pdata->max_current);
655 if (ret)
656 return ret;
657
658 return lm3533_ctrlbank_set_pwm(&led->cb, pdata->pwm);
659}
660
661static int __devinit lm3533_led_probe(struct platform_device *pdev)
662{
663 struct lm3533 *lm3533;
664 struct lm3533_led_platform_data *pdata;
665 struct lm3533_led *led;
666 int ret;
667
668 dev_dbg(&pdev->dev, "%s\n", __func__);
669
670 lm3533 = dev_get_drvdata(pdev->dev.parent);
671 if (!lm3533)
672 return -EINVAL;
673
674 pdata = pdev->dev.platform_data;
675 if (!pdata) {
676 dev_err(&pdev->dev, "no platform data\n");
677 return -EINVAL;
678 }
679
680 if (pdev->id < 0 || pdev->id >= LM3533_LVCTRLBANK_COUNT) {
681 dev_err(&pdev->dev, "illegal LED id %d\n", pdev->id);
682 return -EINVAL;
683 }
684
685 led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
686 if (!led)
687 return -ENOMEM;
688
689 led->lm3533 = lm3533;
690 led->cdev.name = pdata->name;
691 led->cdev.default_trigger = pdata->default_trigger;
692 led->cdev.brightness_set = lm3533_led_set;
693 led->cdev.brightness_get = lm3533_led_get;
694 led->cdev.blink_set = lm3533_led_blink_set;
695 led->cdev.brightness = LED_OFF;
696 led->id = pdev->id;
697
698 mutex_init(&led->mutex);
699 INIT_WORK(&led->work, lm3533_led_work);
700
701 /* The class framework makes a callback to get brightness during
702 * registration so use parent device (for error reporting) until
703 * registered.
704 */
705 led->cb.lm3533 = lm3533;
706 led->cb.id = lm3533_led_get_ctrlbank_id(led);
707 led->cb.dev = lm3533->dev;
708
709 platform_set_drvdata(pdev, led);
710
711 ret = led_classdev_register(pdev->dev.parent, &led->cdev);
712 if (ret) {
713 dev_err(&pdev->dev, "failed to register LED %d\n", pdev->id);
714 return ret;
715 }
716
717 led->cb.dev = led->cdev.dev;
718
719 ret = sysfs_create_group(&led->cdev.dev->kobj,
720 &lm3533_led_attribute_group);
721 if (ret < 0) {
722 dev_err(&pdev->dev, "failed to create sysfs attributes\n");
723 goto err_unregister;
724 }
725
726 ret = lm3533_led_setup(led, pdata);
727 if (ret)
728 goto err_sysfs_remove;
729
730 ret = lm3533_ctrlbank_enable(&led->cb);
731 if (ret)
732 goto err_sysfs_remove;
733
734 return 0;
735
736err_sysfs_remove:
737 sysfs_remove_group(&led->cdev.dev->kobj, &lm3533_led_attribute_group);
738err_unregister:
739 led_classdev_unregister(&led->cdev);
740 flush_work_sync(&led->work);
741
742 return ret;
743}
744
745static int __devexit lm3533_led_remove(struct platform_device *pdev)
746{
747 struct lm3533_led *led = platform_get_drvdata(pdev);
748
749 dev_dbg(&pdev->dev, "%s\n", __func__);
750
751 lm3533_ctrlbank_disable(&led->cb);
752 sysfs_remove_group(&led->cdev.dev->kobj, &lm3533_led_attribute_group);
753 led_classdev_unregister(&led->cdev);
754 flush_work_sync(&led->work);
755
756 return 0;
757}
758
759static void lm3533_led_shutdown(struct platform_device *pdev)
760{
761
762 struct lm3533_led *led = platform_get_drvdata(pdev);
763
764 dev_dbg(&pdev->dev, "%s\n", __func__);
765
766 lm3533_ctrlbank_disable(&led->cb);
767 lm3533_led_set(&led->cdev, LED_OFF); /* disable blink */
768 flush_work_sync(&led->work);
769}
770
771static struct platform_driver lm3533_led_driver = {
772 .driver = {
773 .name = "lm3533-leds",
774 .owner = THIS_MODULE,
775 },
776 .probe = lm3533_led_probe,
777 .remove = __devexit_p(lm3533_led_remove),
778 .shutdown = lm3533_led_shutdown,
779};
780module_platform_driver(lm3533_led_driver);
781
782MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
783MODULE_DESCRIPTION("LM3533 LED driver");
784MODULE_LICENSE("GPL");
785MODULE_ALIAS("platform:lm3533-leds");
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
43struct 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
54static inline struct lm3533_led *to_lm3533_led(struct led_classdev *cdev)
55{
56 return container_of(cdev, struct lm3533_led, cdev);
57}
58
59static inline int lm3533_led_get_ctrlbank_id(struct lm3533_led *led)
60{
61 return led->id + 2;
62}
63
64static inline u8 lm3533_led_get_lv_reg(struct lm3533_led *led, u8 base)
65{
66 return base + led->id;
67}
68
69static inline u8 lm3533_led_get_pattern(struct lm3533_led *led)
70{
71 return led->id;
72}
73
74static 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
80static 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);
112out:
113 mutex_unlock(&led->mutex);
114
115 return ret;
116}
117
118static 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
131static 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 */
182static 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 */
207static 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 */
243static 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
271static 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
276static 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
281static 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
311static 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 sysfs_emit(buf, "%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 */
332static 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 sysfs_emit(buf, "%x\n", val);
348}
349
350static 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
357static 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
364static 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
385static 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
393static 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
401static 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 sysfs_emit(buf, "%u\n", channel);
419}
420
421static 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
451static 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 sysfs_emit(buf, "%d\n", enable);
469}
470
471static 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
501static 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 sysfs_emit(buf, "%x\n", linear);
522}
523
524static 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
554static 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 sysfs_emit(buf, "%u\n", val);
568}
569
570static 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
589static LM3533_ATTR_RW(als_channel);
590static LM3533_ATTR_RW(als_en);
591static LM3533_ATTR_RW(falltime);
592static LM3533_ATTR_RO(id);
593static LM3533_ATTR_RW(linear);
594static LM3533_ATTR_RW(pwm);
595static LM3533_ATTR_RW(risetime);
596
597static 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
608static 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
625static const struct attribute_group lm3533_led_attribute_group = {
626 .is_visible = lm3533_led_attr_is_visible,
627 .attrs = lm3533_led_attributes
628};
629
630static const struct attribute_group *lm3533_led_attribute_groups[] = {
631 &lm3533_led_attribute_group,
632 NULL
633};
634
635static 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
647static 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
715err_deregister:
716 led_classdev_unregister(&led->cdev);
717
718 return ret;
719}
720
721static 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
733static 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
744static 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};
752module_platform_driver(lm3533_led_driver);
753
754MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
755MODULE_DESCRIPTION("LM3533 LED driver");
756MODULE_LICENSE("GPL");
757MODULE_ALIAS("platform:lm3533-leds");