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