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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
401dea7f JH |
2 | /* |
3 | * leds-lm3533.c -- LM3533 LED driver | |
4 | * | |
5 | * Copyright (C) 2011-2012 Texas Instruments | |
6 | * | |
7 | * Author: Johan Hovold <jhovold@gmail.com> | |
401dea7f JH |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
401dea7f JH |
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> | |
401dea7f JH |
16 | |
17 | #include <linux/mfd/lm3533.h> | |
18 | ||
19 | ||
20 | #define LM3533_LVCTRLBANK_MIN 2 | |
21 | #define LM3533_LVCTRLBANK_MAX 5 | |
22 | #define LM3533_LVCTRLBANK_COUNT 4 | |
23 | #define LM3533_RISEFALLTIME_MAX 7 | |
24 | #define LM3533_ALS_CHANNEL_LV_MIN 1 | |
25 | #define LM3533_ALS_CHANNEL_LV_MAX 2 | |
26 | ||
27 | #define LM3533_REG_CTRLBANK_BCONF_BASE 0x1b | |
28 | #define LM3533_REG_PATTERN_ENABLE 0x28 | |
29 | #define LM3533_REG_PATTERN_LOW_TIME_BASE 0x71 | |
30 | #define LM3533_REG_PATTERN_HIGH_TIME_BASE 0x72 | |
31 | #define LM3533_REG_PATTERN_RISETIME_BASE 0x74 | |
32 | #define LM3533_REG_PATTERN_FALLTIME_BASE 0x75 | |
33 | ||
34 | #define LM3533_REG_PATTERN_STEP 0x10 | |
35 | ||
36 | #define LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK 0x04 | |
37 | #define LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK 0x02 | |
38 | #define LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK 0x01 | |
39 | ||
40 | #define LM3533_LED_FLAG_PATTERN_ENABLE 1 | |
41 | ||
42 | ||
43 | struct lm3533_led { | |
44 | struct lm3533 *lm3533; | |
45 | struct lm3533_ctrlbank cb; | |
46 | struct led_classdev cdev; | |
47 | int id; | |
48 | ||
49 | struct mutex mutex; | |
50 | unsigned long flags; | |
401dea7f JH |
51 | }; |
52 | ||
53 | ||
54 | static inline struct lm3533_led *to_lm3533_led(struct led_classdev *cdev) | |
55 | { | |
56 | return container_of(cdev, struct lm3533_led, cdev); | |
57 | } | |
58 | ||
59 | static inline int lm3533_led_get_ctrlbank_id(struct lm3533_led *led) | |
60 | { | |
61 | return led->id + 2; | |
62 | } | |
63 | ||
64 | static inline u8 lm3533_led_get_lv_reg(struct lm3533_led *led, u8 base) | |
65 | { | |
66 | return base + led->id; | |
67 | } | |
68 | ||
69 | static inline u8 lm3533_led_get_pattern(struct lm3533_led *led) | |
70 | { | |
71 | return led->id; | |
72 | } | |
73 | ||
74 | static inline u8 lm3533_led_get_pattern_reg(struct lm3533_led *led, | |
75 | u8 base) | |
76 | { | |
77 | return base + lm3533_led_get_pattern(led) * LM3533_REG_PATTERN_STEP; | |
78 | } | |
79 | ||
80 | static int lm3533_led_pattern_enable(struct lm3533_led *led, int enable) | |
81 | { | |
82 | u8 mask; | |
83 | u8 val; | |
84 | int pattern; | |
85 | int state; | |
86 | int ret = 0; | |
87 | ||
88 | dev_dbg(led->cdev.dev, "%s - %d\n", __func__, enable); | |
89 | ||
90 | mutex_lock(&led->mutex); | |
91 | ||
92 | state = test_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags); | |
93 | if ((enable && state) || (!enable && !state)) | |
94 | goto out; | |
95 | ||
96 | pattern = lm3533_led_get_pattern(led); | |
97 | mask = 1 << (2 * pattern); | |
98 | ||
99 | if (enable) | |
100 | val = mask; | |
101 | else | |
102 | val = 0; | |
103 | ||
104 | ret = lm3533_update(led->lm3533, LM3533_REG_PATTERN_ENABLE, val, mask); | |
105 | if (ret) { | |
106 | dev_err(led->cdev.dev, "failed to enable pattern %d (%d)\n", | |
107 | pattern, enable); | |
108 | goto out; | |
109 | } | |
110 | ||
111 | __change_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags); | |
112 | out: | |
113 | mutex_unlock(&led->mutex); | |
114 | ||
115 | return ret; | |
116 | } | |
117 | ||
a478851c | 118 | static int lm3533_led_set(struct led_classdev *cdev, |
401dea7f JH |
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 | ||
a478851c AL |
125 | if (value == 0) |
126 | lm3533_led_pattern_enable(led, 0); /* disable blink */ | |
127 | ||
128 | return lm3533_ctrlbank_set_brightness(&led->cb, value); | |
401dea7f JH |
129 | } |
130 | ||
131 | static enum led_brightness lm3533_led_get(struct led_classdev *cdev) | |
132 | { | |
133 | struct lm3533_led *led = to_lm3533_led(cdev); | |
134 | u8 val; | |
135 | int ret; | |
136 | ||
137 | ret = lm3533_ctrlbank_get_brightness(&led->cb, &val); | |
138 | if (ret) | |
139 | return ret; | |
140 | ||
141 | dev_dbg(led->cdev.dev, "%s - %u\n", __func__, val); | |
142 | ||
143 | return val; | |
144 | } | |
145 | ||
146 | /* Pattern generator defines (delays in us). */ | |
147 | #define LM3533_LED_DELAY1_VMIN 0x00 | |
148 | #define LM3533_LED_DELAY2_VMIN 0x3d | |
149 | #define LM3533_LED_DELAY3_VMIN 0x80 | |
150 | ||
151 | #define LM3533_LED_DELAY1_VMAX (LM3533_LED_DELAY2_VMIN - 1) | |
152 | #define LM3533_LED_DELAY2_VMAX (LM3533_LED_DELAY3_VMIN - 1) | |
153 | #define LM3533_LED_DELAY3_VMAX 0xff | |
154 | ||
155 | #define LM3533_LED_DELAY1_TMIN 16384U | |
156 | #define LM3533_LED_DELAY2_TMIN 1130496U | |
157 | #define LM3533_LED_DELAY3_TMIN 10305536U | |
158 | ||
159 | #define LM3533_LED_DELAY1_TMAX 999424U | |
160 | #define LM3533_LED_DELAY2_TMAX 9781248U | |
161 | #define LM3533_LED_DELAY3_TMAX 76890112U | |
162 | ||
163 | /* t_step = (t_max - t_min) / (v_max - v_min) */ | |
164 | #define LM3533_LED_DELAY1_TSTEP 16384 | |
165 | #define LM3533_LED_DELAY2_TSTEP 131072 | |
166 | #define LM3533_LED_DELAY3_TSTEP 524288 | |
167 | ||
168 | /* Delay limits for hardware accelerated blinking (in ms). */ | |
169 | #define LM3533_LED_DELAY_ON_MAX \ | |
170 | ((LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY2_TSTEP / 2) / 1000) | |
171 | #define LM3533_LED_DELAY_OFF_MAX \ | |
172 | ((LM3533_LED_DELAY3_TMAX + LM3533_LED_DELAY3_TSTEP / 2) / 1000) | |
173 | ||
174 | /* | |
175 | * Returns linear map of *t from [t_min,t_max] to [v_min,v_max] with a step | |
176 | * size of t_step, where | |
177 | * | |
178 | * t_step = (t_max - t_min) / (v_max - v_min) | |
179 | * | |
180 | * and updates *t to reflect the mapped value. | |
181 | */ | |
182 | static u8 time_to_val(unsigned *t, unsigned t_min, unsigned t_step, | |
183 | u8 v_min, u8 v_max) | |
184 | { | |
185 | unsigned val; | |
186 | ||
187 | val = (*t + t_step / 2 - t_min) / t_step + v_min; | |
188 | ||
189 | *t = t_step * (val - v_min) + t_min; | |
190 | ||
191 | return (u8)val; | |
192 | } | |
193 | ||
194 | /* | |
195 | * Returns time code corresponding to *delay (in ms) and updates *delay to | |
196 | * reflect actual hardware delay. | |
197 | * | |
198 | * Hardware supports 256 discrete delay times, divided into three groups with | |
199 | * the following ranges and step-sizes: | |
200 | * | |
201 | * [ 16, 999] [0x00, 0x3e] step 16 ms | |
202 | * [ 1130, 9781] [0x3d, 0x7f] step 131 ms | |
203 | * [10306, 76890] [0x80, 0xff] step 524 ms | |
204 | * | |
205 | * Note that delay group 3 is only available for delay_off. | |
206 | */ | |
207 | static u8 lm3533_led_get_hw_delay(unsigned *delay) | |
208 | { | |
209 | unsigned t; | |
210 | u8 val; | |
211 | ||
212 | t = *delay * 1000; | |
213 | ||
214 | if (t >= (LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY3_TMIN) / 2) { | |
215 | t = clamp(t, LM3533_LED_DELAY3_TMIN, LM3533_LED_DELAY3_TMAX); | |
216 | val = time_to_val(&t, LM3533_LED_DELAY3_TMIN, | |
217 | LM3533_LED_DELAY3_TSTEP, | |
218 | LM3533_LED_DELAY3_VMIN, | |
219 | LM3533_LED_DELAY3_VMAX); | |
220 | } else if (t >= (LM3533_LED_DELAY1_TMAX + LM3533_LED_DELAY2_TMIN) / 2) { | |
221 | t = clamp(t, LM3533_LED_DELAY2_TMIN, LM3533_LED_DELAY2_TMAX); | |
222 | val = time_to_val(&t, LM3533_LED_DELAY2_TMIN, | |
223 | LM3533_LED_DELAY2_TSTEP, | |
224 | LM3533_LED_DELAY2_VMIN, | |
225 | LM3533_LED_DELAY2_VMAX); | |
226 | } else { | |
227 | t = clamp(t, LM3533_LED_DELAY1_TMIN, LM3533_LED_DELAY1_TMAX); | |
228 | val = time_to_val(&t, LM3533_LED_DELAY1_TMIN, | |
229 | LM3533_LED_DELAY1_TSTEP, | |
230 | LM3533_LED_DELAY1_VMIN, | |
231 | LM3533_LED_DELAY1_VMAX); | |
232 | } | |
233 | ||
234 | *delay = (t + 500) / 1000; | |
235 | ||
236 | return val; | |
237 | } | |
238 | ||
239 | /* | |
240 | * Set delay register base to *delay (in ms) and update *delay to reflect | |
241 | * actual hardware delay used. | |
242 | */ | |
243 | static u8 lm3533_led_delay_set(struct lm3533_led *led, u8 base, | |
244 | unsigned long *delay) | |
245 | { | |
246 | unsigned t; | |
247 | u8 val; | |
248 | u8 reg; | |
249 | int ret; | |
250 | ||
251 | t = (unsigned)*delay; | |
252 | ||
253 | /* Delay group 3 is only available for low time (delay off). */ | |
254 | if (base != LM3533_REG_PATTERN_LOW_TIME_BASE) | |
255 | t = min(t, LM3533_LED_DELAY2_TMAX / 1000); | |
256 | ||
257 | val = lm3533_led_get_hw_delay(&t); | |
258 | ||
259 | dev_dbg(led->cdev.dev, "%s - %lu: %u (0x%02x)\n", __func__, | |
260 | *delay, t, val); | |
261 | reg = lm3533_led_get_pattern_reg(led, base); | |
262 | ret = lm3533_write(led->lm3533, reg, val); | |
263 | if (ret) | |
264 | dev_err(led->cdev.dev, "failed to set delay (%02x)\n", reg); | |
265 | ||
266 | *delay = t; | |
267 | ||
268 | return ret; | |
269 | } | |
270 | ||
271 | static int lm3533_led_delay_on_set(struct lm3533_led *led, unsigned long *t) | |
272 | { | |
273 | return lm3533_led_delay_set(led, LM3533_REG_PATTERN_HIGH_TIME_BASE, t); | |
274 | } | |
275 | ||
276 | static int lm3533_led_delay_off_set(struct lm3533_led *led, unsigned long *t) | |
277 | { | |
278 | return lm3533_led_delay_set(led, LM3533_REG_PATTERN_LOW_TIME_BASE, t); | |
279 | } | |
280 | ||
281 | static int lm3533_led_blink_set(struct led_classdev *cdev, | |
282 | unsigned long *delay_on, | |
283 | unsigned long *delay_off) | |
284 | { | |
285 | struct lm3533_led *led = to_lm3533_led(cdev); | |
286 | int ret; | |
287 | ||
288 | dev_dbg(led->cdev.dev, "%s - on = %lu, off = %lu\n", __func__, | |
289 | *delay_on, *delay_off); | |
290 | ||
291 | if (*delay_on > LM3533_LED_DELAY_ON_MAX || | |
292 | *delay_off > LM3533_LED_DELAY_OFF_MAX) | |
293 | return -EINVAL; | |
294 | ||
295 | if (*delay_on == 0 && *delay_off == 0) { | |
296 | *delay_on = 500; | |
297 | *delay_off = 500; | |
298 | } | |
299 | ||
300 | ret = lm3533_led_delay_on_set(led, delay_on); | |
301 | if (ret) | |
302 | return ret; | |
303 | ||
304 | ret = lm3533_led_delay_off_set(led, delay_off); | |
305 | if (ret) | |
306 | return ret; | |
307 | ||
308 | return lm3533_led_pattern_enable(led, 1); | |
309 | } | |
310 | ||
311 | static ssize_t show_id(struct device *dev, | |
312 | struct device_attribute *attr, char *buf) | |
313 | { | |
314 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
315 | struct lm3533_led *led = to_lm3533_led(led_cdev); | |
316 | ||
317 | return scnprintf(buf, PAGE_SIZE, "%d\n", led->id); | |
318 | } | |
319 | ||
320 | /* | |
321 | * Pattern generator rise/fall times: | |
322 | * | |
323 | * 0 - 2048 us (default) | |
324 | * 1 - 262 ms | |
325 | * 2 - 524 ms | |
326 | * 3 - 1.049 s | |
327 | * 4 - 2.097 s | |
328 | * 5 - 4.194 s | |
329 | * 6 - 8.389 s | |
330 | * 7 - 16.78 s | |
331 | */ | |
332 | static ssize_t show_risefalltime(struct device *dev, | |
333 | struct device_attribute *attr, | |
334 | char *buf, u8 base) | |
335 | { | |
336 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
337 | struct lm3533_led *led = to_lm3533_led(led_cdev); | |
338 | ssize_t ret; | |
339 | u8 reg; | |
340 | u8 val; | |
341 | ||
342 | reg = lm3533_led_get_pattern_reg(led, base); | |
343 | ret = lm3533_read(led->lm3533, reg, &val); | |
344 | if (ret) | |
345 | return ret; | |
346 | ||
347 | return scnprintf(buf, PAGE_SIZE, "%x\n", val); | |
348 | } | |
349 | ||
350 | static ssize_t show_risetime(struct device *dev, | |
351 | struct device_attribute *attr, char *buf) | |
352 | { | |
353 | return show_risefalltime(dev, attr, buf, | |
354 | LM3533_REG_PATTERN_RISETIME_BASE); | |
355 | } | |
356 | ||
357 | static ssize_t show_falltime(struct device *dev, | |
358 | struct device_attribute *attr, char *buf) | |
359 | { | |
360 | return show_risefalltime(dev, attr, buf, | |
361 | LM3533_REG_PATTERN_FALLTIME_BASE); | |
362 | } | |
363 | ||
364 | static ssize_t store_risefalltime(struct device *dev, | |
365 | struct device_attribute *attr, | |
366 | const char *buf, size_t len, u8 base) | |
367 | { | |
368 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
369 | struct lm3533_led *led = to_lm3533_led(led_cdev); | |
370 | u8 val; | |
371 | u8 reg; | |
372 | int ret; | |
373 | ||
374 | if (kstrtou8(buf, 0, &val) || val > LM3533_RISEFALLTIME_MAX) | |
375 | return -EINVAL; | |
376 | ||
377 | reg = lm3533_led_get_pattern_reg(led, base); | |
378 | ret = lm3533_write(led->lm3533, reg, val); | |
379 | if (ret) | |
380 | return ret; | |
381 | ||
382 | return len; | |
383 | } | |
384 | ||
385 | static ssize_t store_risetime(struct device *dev, | |
386 | struct device_attribute *attr, | |
387 | const char *buf, size_t len) | |
388 | { | |
389 | return store_risefalltime(dev, attr, buf, len, | |
390 | LM3533_REG_PATTERN_RISETIME_BASE); | |
391 | } | |
392 | ||
393 | static ssize_t store_falltime(struct device *dev, | |
394 | struct device_attribute *attr, | |
395 | const char *buf, size_t len) | |
396 | { | |
397 | return store_risefalltime(dev, attr, buf, len, | |
398 | LM3533_REG_PATTERN_FALLTIME_BASE); | |
399 | } | |
400 | ||
401 | static ssize_t show_als_channel(struct device *dev, | |
402 | struct device_attribute *attr, char *buf) | |
403 | { | |
404 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
405 | struct lm3533_led *led = to_lm3533_led(led_cdev); | |
406 | unsigned channel; | |
407 | u8 reg; | |
408 | u8 val; | |
409 | int ret; | |
410 | ||
411 | reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE); | |
412 | ret = lm3533_read(led->lm3533, reg, &val); | |
413 | if (ret) | |
414 | return ret; | |
415 | ||
416 | channel = (val & LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK) + 1; | |
417 | ||
418 | return scnprintf(buf, PAGE_SIZE, "%u\n", channel); | |
419 | } | |
420 | ||
421 | static ssize_t store_als_channel(struct device *dev, | |
422 | struct device_attribute *attr, | |
423 | const char *buf, size_t len) | |
424 | { | |
425 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
426 | struct lm3533_led *led = to_lm3533_led(led_cdev); | |
427 | unsigned channel; | |
428 | u8 reg; | |
429 | u8 val; | |
430 | u8 mask; | |
431 | int ret; | |
432 | ||
433 | if (kstrtouint(buf, 0, &channel)) | |
434 | return -EINVAL; | |
435 | ||
436 | if (channel < LM3533_ALS_CHANNEL_LV_MIN || | |
437 | channel > LM3533_ALS_CHANNEL_LV_MAX) | |
438 | return -EINVAL; | |
439 | ||
440 | reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE); | |
441 | mask = LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK; | |
442 | val = channel - 1; | |
443 | ||
444 | ret = lm3533_update(led->lm3533, reg, val, mask); | |
445 | if (ret) | |
446 | return ret; | |
447 | ||
448 | return len; | |
449 | } | |
450 | ||
451 | static ssize_t show_als_en(struct device *dev, | |
452 | struct device_attribute *attr, char *buf) | |
453 | { | |
454 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
455 | struct lm3533_led *led = to_lm3533_led(led_cdev); | |
456 | bool enable; | |
457 | u8 reg; | |
458 | u8 val; | |
459 | int ret; | |
460 | ||
461 | reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE); | |
462 | ret = lm3533_read(led->lm3533, reg, &val); | |
463 | if (ret) | |
464 | return ret; | |
465 | ||
466 | enable = val & LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK; | |
467 | ||
468 | return scnprintf(buf, PAGE_SIZE, "%d\n", enable); | |
469 | } | |
470 | ||
471 | static ssize_t store_als_en(struct device *dev, | |
472 | struct device_attribute *attr, | |
473 | const char *buf, size_t len) | |
474 | { | |
475 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
476 | struct lm3533_led *led = to_lm3533_led(led_cdev); | |
477 | unsigned enable; | |
478 | u8 reg; | |
479 | u8 mask; | |
480 | u8 val; | |
481 | int ret; | |
482 | ||
483 | if (kstrtouint(buf, 0, &enable)) | |
484 | return -EINVAL; | |
485 | ||
486 | reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE); | |
487 | mask = LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK; | |
488 | ||
489 | if (enable) | |
490 | val = mask; | |
491 | else | |
492 | val = 0; | |
493 | ||
494 | ret = lm3533_update(led->lm3533, reg, val, mask); | |
495 | if (ret) | |
496 | return ret; | |
497 | ||
498 | return len; | |
499 | } | |
500 | ||
501 | static ssize_t show_linear(struct device *dev, | |
502 | struct device_attribute *attr, char *buf) | |
503 | { | |
504 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
505 | struct lm3533_led *led = to_lm3533_led(led_cdev); | |
506 | u8 reg; | |
507 | u8 val; | |
508 | int linear; | |
509 | int ret; | |
510 | ||
511 | reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE); | |
512 | ret = lm3533_read(led->lm3533, reg, &val); | |
513 | if (ret) | |
514 | return ret; | |
515 | ||
516 | if (val & LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK) | |
517 | linear = 1; | |
518 | else | |
519 | linear = 0; | |
520 | ||
521 | return scnprintf(buf, PAGE_SIZE, "%x\n", linear); | |
522 | } | |
523 | ||
524 | static ssize_t store_linear(struct device *dev, | |
525 | struct device_attribute *attr, | |
526 | const char *buf, size_t len) | |
527 | { | |
528 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
529 | struct lm3533_led *led = to_lm3533_led(led_cdev); | |
530 | unsigned long linear; | |
531 | u8 reg; | |
532 | u8 mask; | |
533 | u8 val; | |
534 | int ret; | |
535 | ||
536 | if (kstrtoul(buf, 0, &linear)) | |
537 | return -EINVAL; | |
538 | ||
539 | reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE); | |
540 | mask = LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK; | |
541 | ||
542 | if (linear) | |
543 | val = mask; | |
544 | else | |
545 | val = 0; | |
546 | ||
547 | ret = lm3533_update(led->lm3533, reg, val, mask); | |
548 | if (ret) | |
549 | return ret; | |
550 | ||
551 | return len; | |
552 | } | |
553 | ||
554 | static ssize_t show_pwm(struct device *dev, | |
555 | struct device_attribute *attr, | |
556 | char *buf) | |
557 | { | |
558 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
559 | struct lm3533_led *led = to_lm3533_led(led_cdev); | |
560 | u8 val; | |
561 | int ret; | |
562 | ||
563 | ret = lm3533_ctrlbank_get_pwm(&led->cb, &val); | |
564 | if (ret) | |
565 | return ret; | |
566 | ||
567 | return scnprintf(buf, PAGE_SIZE, "%u\n", val); | |
568 | } | |
569 | ||
570 | static ssize_t store_pwm(struct device *dev, | |
571 | struct device_attribute *attr, | |
572 | const char *buf, size_t len) | |
573 | { | |
574 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
575 | struct lm3533_led *led = to_lm3533_led(led_cdev); | |
576 | u8 val; | |
577 | int ret; | |
578 | ||
579 | if (kstrtou8(buf, 0, &val)) | |
580 | return -EINVAL; | |
581 | ||
582 | ret = lm3533_ctrlbank_set_pwm(&led->cb, val); | |
583 | if (ret) | |
584 | return ret; | |
585 | ||
586 | return len; | |
587 | } | |
588 | ||
589 | static LM3533_ATTR_RW(als_channel); | |
590 | static LM3533_ATTR_RW(als_en); | |
591 | static LM3533_ATTR_RW(falltime); | |
592 | static LM3533_ATTR_RO(id); | |
593 | static LM3533_ATTR_RW(linear); | |
594 | static LM3533_ATTR_RW(pwm); | |
595 | static LM3533_ATTR_RW(risetime); | |
596 | ||
597 | static struct attribute *lm3533_led_attributes[] = { | |
598 | &dev_attr_als_channel.attr, | |
599 | &dev_attr_als_en.attr, | |
600 | &dev_attr_falltime.attr, | |
601 | &dev_attr_id.attr, | |
602 | &dev_attr_linear.attr, | |
603 | &dev_attr_pwm.attr, | |
604 | &dev_attr_risetime.attr, | |
605 | NULL, | |
606 | }; | |
607 | ||
608 | static umode_t lm3533_led_attr_is_visible(struct kobject *kobj, | |
609 | struct attribute *attr, int n) | |
610 | { | |
611 | struct device *dev = container_of(kobj, struct device, 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 | ||
430e48ec | 625 | static const struct attribute_group lm3533_led_attribute_group = { |
401dea7f JH |
626 | .is_visible = lm3533_led_attr_is_visible, |
627 | .attrs = lm3533_led_attributes | |
628 | }; | |
629 | ||
9db93860 JH |
630 | static const struct attribute_group *lm3533_led_attribute_groups[] = { |
631 | &lm3533_led_attribute_group, | |
632 | NULL | |
633 | }; | |
634 | ||
98ea1ea2 | 635 | static int lm3533_led_setup(struct lm3533_led *led, |
401dea7f JH |
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 | ||
98ea1ea2 | 647 | static int lm3533_led_probe(struct platform_device *pdev) |
401dea7f JH |
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 | ||
87aae1ea | 660 | pdata = dev_get_platdata(&pdev->dev); |
401dea7f JH |
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; | |
a478851c | 678 | led->cdev.brightness_set_blocking = lm3533_led_set; |
401dea7f JH |
679 | led->cdev.brightness_get = lm3533_led_get; |
680 | led->cdev.blink_set = lm3533_led_blink_set; | |
681 | led->cdev.brightness = LED_OFF; | |
9db93860 | 682 | led->cdev.groups = lm3533_led_attribute_groups, |
401dea7f JH |
683 | led->id = pdev->id; |
684 | ||
685 | mutex_init(&led->mutex); | |
401dea7f JH |
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 | ||
50154e29 | 697 | ret = devm_led_classdev_register(pdev->dev.parent, &led->cdev); |
401dea7f JH |
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 | ||
401dea7f JH |
705 | ret = lm3533_led_setup(led, pdata); |
706 | if (ret) | |
50154e29 | 707 | return ret; |
401dea7f JH |
708 | |
709 | ret = lm3533_ctrlbank_enable(&led->cb); | |
710 | if (ret) | |
50154e29 | 711 | return ret; |
401dea7f JH |
712 | |
713 | return 0; | |
401dea7f JH |
714 | } |
715 | ||
678e8a6b | 716 | static int lm3533_led_remove(struct platform_device *pdev) |
401dea7f JH |
717 | { |
718 | struct lm3533_led *led = platform_get_drvdata(pdev); | |
719 | ||
720 | dev_dbg(&pdev->dev, "%s\n", __func__); | |
721 | ||
722 | lm3533_ctrlbank_disable(&led->cb); | |
401dea7f JH |
723 | |
724 | return 0; | |
725 | } | |
726 | ||
727 | static void lm3533_led_shutdown(struct platform_device *pdev) | |
728 | { | |
729 | ||
730 | struct lm3533_led *led = platform_get_drvdata(pdev); | |
731 | ||
732 | dev_dbg(&pdev->dev, "%s\n", __func__); | |
733 | ||
734 | lm3533_ctrlbank_disable(&led->cb); | |
735 | lm3533_led_set(&led->cdev, LED_OFF); /* disable blink */ | |
401dea7f JH |
736 | } |
737 | ||
738 | static struct platform_driver lm3533_led_driver = { | |
739 | .driver = { | |
740 | .name = "lm3533-leds", | |
401dea7f JH |
741 | }, |
742 | .probe = lm3533_led_probe, | |
df07cf81 | 743 | .remove = lm3533_led_remove, |
401dea7f JH |
744 | .shutdown = lm3533_led_shutdown, |
745 | }; | |
746 | module_platform_driver(lm3533_led_driver); | |
747 | ||
748 | MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>"); | |
749 | MODULE_DESCRIPTION("LM3533 LED driver"); | |
750 | MODULE_LICENSE("GPL"); | |
751 | MODULE_ALIAS("platform:lm3533-leds"); |