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401dea7f JH |
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> | |
401dea7f JH |
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 | ||
48 | struct 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 | ||
62 | static inline struct lm3533_led *to_lm3533_led(struct led_classdev *cdev) | |
63 | { | |
64 | return container_of(cdev, struct lm3533_led, cdev); | |
65 | } | |
66 | ||
67 | static inline int lm3533_led_get_ctrlbank_id(struct lm3533_led *led) | |
68 | { | |
69 | return led->id + 2; | |
70 | } | |
71 | ||
72 | static inline u8 lm3533_led_get_lv_reg(struct lm3533_led *led, u8 base) | |
73 | { | |
74 | return base + led->id; | |
75 | } | |
76 | ||
77 | static inline u8 lm3533_led_get_pattern(struct lm3533_led *led) | |
78 | { | |
79 | return led->id; | |
80 | } | |
81 | ||
82 | static 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 | ||
88 | static 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); | |
120 | out: | |
121 | mutex_unlock(&led->mutex); | |
122 | ||
123 | return ret; | |
124 | } | |
125 | ||
126 | static 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 | ||
138 | static 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 | ||
149 | static 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 | */ | |
200 | static 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 | */ | |
225 | static 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 | */ | |
261 | static 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 | ||
289 | static 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 | ||
294 | static 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 | ||
299 | static 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 | ||
329 | static 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 | */ | |
350 | static 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 | ||
368 | static 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 | ||
375 | static 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 | ||
382 | static 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 | ||
403 | static 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 | ||
411 | static 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 | ||
419 | static 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 | ||
439 | static 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 | ||
469 | static 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 | ||
489 | static 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 | ||
519 | static 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 | ||
542 | static 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 | ||
572 | static 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 | ||
588 | static 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 | ||
607 | static LM3533_ATTR_RW(als_channel); | |
608 | static LM3533_ATTR_RW(als_en); | |
609 | static LM3533_ATTR_RW(falltime); | |
610 | static LM3533_ATTR_RO(id); | |
611 | static LM3533_ATTR_RW(linear); | |
612 | static LM3533_ATTR_RW(pwm); | |
613 | static LM3533_ATTR_RW(risetime); | |
614 | ||
615 | static 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 | ||
626 | static 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 | ||
643 | static struct attribute_group lm3533_led_attribute_group = { | |
644 | .is_visible = lm3533_led_attr_is_visible, | |
645 | .attrs = lm3533_led_attributes | |
646 | }; | |
647 | ||
98ea1ea2 | 648 | static int lm3533_led_setup(struct lm3533_led *led, |
401dea7f JH |
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 | ||
98ea1ea2 | 660 | static int lm3533_led_probe(struct platform_device *pdev) |
401dea7f JH |
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 | ||
87aae1ea | 673 | pdata = dev_get_platdata(&pdev->dev); |
401dea7f JH |
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 | ||
735 | err_sysfs_remove: | |
736 | sysfs_remove_group(&led->cdev.dev->kobj, &lm3533_led_attribute_group); | |
737 | err_unregister: | |
738 | led_classdev_unregister(&led->cdev); | |
43829731 | 739 | flush_work(&led->work); |
401dea7f JH |
740 | |
741 | return ret; | |
742 | } | |
743 | ||
678e8a6b | 744 | static int lm3533_led_remove(struct platform_device *pdev) |
401dea7f JH |
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); | |
43829731 | 753 | flush_work(&led->work); |
401dea7f JH |
754 | |
755 | return 0; | |
756 | } | |
757 | ||
758 | static 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 */ | |
43829731 | 767 | flush_work(&led->work); |
401dea7f JH |
768 | } |
769 | ||
770 | static struct platform_driver lm3533_led_driver = { | |
771 | .driver = { | |
772 | .name = "lm3533-leds", | |
773 | .owner = THIS_MODULE, | |
774 | }, | |
775 | .probe = lm3533_led_probe, | |
df07cf81 | 776 | .remove = lm3533_led_remove, |
401dea7f JH |
777 | .shutdown = lm3533_led_shutdown, |
778 | }; | |
779 | module_platform_driver(lm3533_led_driver); | |
780 | ||
781 | MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>"); | |
782 | MODULE_DESCRIPTION("LM3533 LED driver"); | |
783 | MODULE_LICENSE("GPL"); | |
784 | MODULE_ALIAS("platform:lm3533-leds"); |