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