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sched: Fix schedule_tail() to disable preemption
[linux/fpc-iii.git] / drivers / leds / leds-bd2802.c
blob6078c15d3452df77da066ec2f3d00bc805c02fa0
1 /*
2 * leds-bd2802.c - RGB LED Driver
3 *
4 * Copyright (C) 2009 Samsung Electronics
5 * Kim Kyuwon <q1.kim@samsung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * Datasheet: http://www.rohm.com/products/databook/driver/pdf/bd2802gu-e.pdf
12 *
13 */
14
15 #include <linux/module.h>
16 #include <linux/i2c.h>
17 #include <linux/gpio.h>
18 #include <linux/delay.h>
19 #include <linux/leds.h>
20 #include <linux/leds-bd2802.h>
21 #include <linux/slab.h>
22 #include <linux/pm.h>
23
24 #define LED_CTL(rgb2en, rgb1en) ((rgb2en) << 4 | ((rgb1en) << 0))
25
26 #define BD2802_LED_OFFSET 0xa
27 #define BD2802_COLOR_OFFSET 0x3
28
29 #define BD2802_REG_CLKSETUP 0x00
30 #define BD2802_REG_CONTROL 0x01
31 #define BD2802_REG_HOURSETUP 0x02
32 #define BD2802_REG_CURRENT1SETUP 0x03
33 #define BD2802_REG_CURRENT2SETUP 0x04
34 #define BD2802_REG_WAVEPATTERN 0x05
35
36 #define BD2802_CURRENT_032 0x10 /* 3.2mA */
37 #define BD2802_CURRENT_000 0x00 /* 0.0mA */
38
39 #define BD2802_PATTERN_FULL 0x07
40 #define BD2802_PATTERN_HALF 0x03
41
42 enum led_ids {
43 LED1,
44 LED2,
45 LED_NUM,
46 };
47
48 enum led_colors {
49 RED,
50 GREEN,
51 BLUE,
52 };
53
54 enum led_bits {
55 BD2802_OFF,
56 BD2802_BLINK,
57 BD2802_ON,
58 };
59
60 /*
61 * State '0' : 'off'
62 * State '1' : 'blink'
63 * State '2' : 'on'.
64 */
65 struct led_state {
66 unsigned r:2;
67 unsigned g:2;
68 unsigned b:2;
69 };
70
71 struct bd2802_led {
72 struct bd2802_led_platform_data *pdata;
73 struct i2c_client *client;
74 struct rw_semaphore rwsem;
75 struct work_struct work;
76
77 struct led_state led[2];
78
79 /*
80 * Making led_classdev as array is not recommended, because array
81 * members prevent using 'container_of' macro. So repetitive works
82 * are needed.
83 */
84 struct led_classdev cdev_led1r;
85 struct led_classdev cdev_led1g;
86 struct led_classdev cdev_led1b;
87 struct led_classdev cdev_led2r;
88 struct led_classdev cdev_led2g;
89 struct led_classdev cdev_led2b;
90
91 /*
92 * Advanced Configuration Function(ADF) mode:
93 * In ADF mode, user can set registers of BD2802GU directly,
94 * therefore BD2802GU doesn't enter reset state.
95 */
96 int adf_on;
97
98 enum led_ids led_id;
99 enum led_colors color;
100 enum led_bits state;
101
102 /* General attributes of RGB LEDs */
103 int wave_pattern;
104 int rgb_current;
105 };
106
107
108 /*--------------------------------------------------------------*/
109 /* BD2802GU helper functions */
110 /*--------------------------------------------------------------*/
111
112 static inline int bd2802_is_rgb_off(struct bd2802_led *led, enum led_ids id,
113 enum led_colors color)
114 {
115 switch (color) {
116 case RED:
117 return !led->led[id].r;
118 case GREEN:
119 return !led->led[id].g;
120 case BLUE:
121 return !led->led[id].b;
122 default:
123 dev_err(&led->client->dev, "%s: Invalid color\n", __func__);
124 return -EINVAL;
125 }
126 }
127
128 static inline int bd2802_is_led_off(struct bd2802_led *led, enum led_ids id)
129 {
130 if (led->led[id].r || led->led[id].g || led->led[id].b)
131 return 0;
132
133 return 1;
134 }
135
136 static inline int bd2802_is_all_off(struct bd2802_led *led)
137 {
138 int i;
139
140 for (i = 0; i < LED_NUM; i++)
141 if (!bd2802_is_led_off(led, i))
142 return 0;
143
144 return 1;
145 }
146
147 static inline u8 bd2802_get_base_offset(enum led_ids id, enum led_colors color)
148 {
149 return id * BD2802_LED_OFFSET + color * BD2802_COLOR_OFFSET;
150 }
151
152 static inline u8 bd2802_get_reg_addr(enum led_ids id, enum led_colors color,
153 u8 reg_offset)
154 {
155 return reg_offset + bd2802_get_base_offset(id, color);
156 }
157
158
159 /*--------------------------------------------------------------*/
160 /* BD2802GU core functions */
161 /*--------------------------------------------------------------*/
162
163 static int bd2802_write_byte(struct i2c_client *client, u8 reg, u8 val)
164 {
165 int ret = i2c_smbus_write_byte_data(client, reg, val);
166 if (ret >= 0)
167 return 0;
168
169 dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
170 __func__, reg, val, ret);
171
172 return ret;
173 }
174
175 static void bd2802_update_state(struct bd2802_led *led, enum led_ids id,
176 enum led_colors color, enum led_bits led_bit)
177 {
178 int i;
179 u8 value;
180
181 for (i = 0; i < LED_NUM; i++) {
182 if (i == id) {
183 switch (color) {
184 case RED:
185 led->led[i].r = led_bit;
186 break;
187 case GREEN:
188 led->led[i].g = led_bit;
189 break;
190 case BLUE:
191 led->led[i].b = led_bit;
192 break;
193 default:
194 dev_err(&led->client->dev,
195 "%s: Invalid color\n", __func__);
196 return;
197 }
198 }
199 }
200
201 if (led_bit == BD2802_BLINK || led_bit == BD2802_ON)
202 return;
203
204 if (!bd2802_is_led_off(led, id))
205 return;
206
207 if (bd2802_is_all_off(led) && !led->adf_on) {
208 gpio_set_value(led->pdata->reset_gpio, 0);
209 return;
210 }
211
212 /*
213 * In this case, other led is turned on, and current led is turned
214 * off. So set RGB LED Control register to stop the current RGB LED
215 */
216 value = (id == LED1) ? LED_CTL(1, 0) : LED_CTL(0, 1);
217 bd2802_write_byte(led->client, BD2802_REG_CONTROL, value);
218 }
219
220 static void bd2802_configure(struct bd2802_led *led)
221 {
222 struct bd2802_led_platform_data *pdata = led->pdata;
223 u8 reg;
224
225 reg = bd2802_get_reg_addr(LED1, RED, BD2802_REG_HOURSETUP);
226 bd2802_write_byte(led->client, reg, pdata->rgb_time);
227
228 reg = bd2802_get_reg_addr(LED2, RED, BD2802_REG_HOURSETUP);
229 bd2802_write_byte(led->client, reg, pdata->rgb_time);
230 }
231
232 static void bd2802_reset_cancel(struct bd2802_led *led)
233 {
234 gpio_set_value(led->pdata->reset_gpio, 1);
235 udelay(100);
236 bd2802_configure(led);
237 }
238
239 static void bd2802_enable(struct bd2802_led *led, enum led_ids id)
240 {
241 enum led_ids other_led = (id == LED1) ? LED2 : LED1;
242 u8 value, other_led_on;
243
244 other_led_on = !bd2802_is_led_off(led, other_led);
245 if (id == LED1)
246 value = LED_CTL(other_led_on, 1);
247 else
248 value = LED_CTL(1 , other_led_on);
249
250 bd2802_write_byte(led->client, BD2802_REG_CONTROL, value);
251 }
252
253 static void bd2802_set_on(struct bd2802_led *led, enum led_ids id,
254 enum led_colors color)
255 {
256 u8 reg;
257
258 if (bd2802_is_all_off(led) && !led->adf_on)
259 bd2802_reset_cancel(led);
260
261 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
262 bd2802_write_byte(led->client, reg, led->rgb_current);
263 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
264 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
265 reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN);
266 bd2802_write_byte(led->client, reg, BD2802_PATTERN_FULL);
267
268 bd2802_enable(led, id);
269 bd2802_update_state(led, id, color, BD2802_ON);
270 }
271
272 static void bd2802_set_blink(struct bd2802_led *led, enum led_ids id,
273 enum led_colors color)
274 {
275 u8 reg;
276
277 if (bd2802_is_all_off(led) && !led->adf_on)
278 bd2802_reset_cancel(led);
279
280 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
281 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
282 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
283 bd2802_write_byte(led->client, reg, led->rgb_current);
284 reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN);
285 bd2802_write_byte(led->client, reg, led->wave_pattern);
286
287 bd2802_enable(led, id);
288 bd2802_update_state(led, id, color, BD2802_BLINK);
289 }
290
291 static void bd2802_turn_on(struct bd2802_led *led, enum led_ids id,
292 enum led_colors color, enum led_bits led_bit)
293 {
294 if (led_bit == BD2802_OFF) {
295 dev_err(&led->client->dev,
296 "Only 'blink' and 'on' are allowed\n");
297 return;
298 }
299
300 if (led_bit == BD2802_BLINK)
301 bd2802_set_blink(led, id, color);
302 else
303 bd2802_set_on(led, id, color);
304 }
305
306 static void bd2802_turn_off(struct bd2802_led *led, enum led_ids id,
307 enum led_colors color)
308 {
309 u8 reg;
310
311 if (bd2802_is_rgb_off(led, id, color))
312 return;
313
314 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
315 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
316 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
317 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
318
319 bd2802_update_state(led, id, color, BD2802_OFF);
320 }
321
322 #define BD2802_SET_REGISTER(reg_addr, reg_name) \
323 static ssize_t bd2802_store_reg##reg_addr(struct device *dev, \
324 struct device_attribute *attr, const char *buf, size_t count) \
325 { \
326 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
327 unsigned long val; \
328 int ret; \
329 if (!count) \
330 return -EINVAL; \
331 ret = kstrtoul(buf, 16, &val); \
332 if (ret) \
333 return ret; \
334 down_write(&led->rwsem); \
335 bd2802_write_byte(led->client, reg_addr, (u8) val); \
336 up_write(&led->rwsem); \
337 return count; \
338 } \
339 static struct device_attribute bd2802_reg##reg_addr##_attr = { \
340 .attr = {.name = reg_name, .mode = 0644}, \
341 .store = bd2802_store_reg##reg_addr, \
342 };
343
344 BD2802_SET_REGISTER(0x00, "0x00");
345 BD2802_SET_REGISTER(0x01, "0x01");
346 BD2802_SET_REGISTER(0x02, "0x02");
347 BD2802_SET_REGISTER(0x03, "0x03");
348 BD2802_SET_REGISTER(0x04, "0x04");
349 BD2802_SET_REGISTER(0x05, "0x05");
350 BD2802_SET_REGISTER(0x06, "0x06");
351 BD2802_SET_REGISTER(0x07, "0x07");
352 BD2802_SET_REGISTER(0x08, "0x08");
353 BD2802_SET_REGISTER(0x09, "0x09");
354 BD2802_SET_REGISTER(0x0a, "0x0a");
355 BD2802_SET_REGISTER(0x0b, "0x0b");
356 BD2802_SET_REGISTER(0x0c, "0x0c");
357 BD2802_SET_REGISTER(0x0d, "0x0d");
358 BD2802_SET_REGISTER(0x0e, "0x0e");
359 BD2802_SET_REGISTER(0x0f, "0x0f");
360 BD2802_SET_REGISTER(0x10, "0x10");
361 BD2802_SET_REGISTER(0x11, "0x11");
362 BD2802_SET_REGISTER(0x12, "0x12");
363 BD2802_SET_REGISTER(0x13, "0x13");
364 BD2802_SET_REGISTER(0x14, "0x14");
365 BD2802_SET_REGISTER(0x15, "0x15");
366
367 static struct device_attribute *bd2802_addr_attributes[] = {
368 &bd2802_reg0x00_attr,
369 &bd2802_reg0x01_attr,
370 &bd2802_reg0x02_attr,
371 &bd2802_reg0x03_attr,
372 &bd2802_reg0x04_attr,
373 &bd2802_reg0x05_attr,
374 &bd2802_reg0x06_attr,
375 &bd2802_reg0x07_attr,
376 &bd2802_reg0x08_attr,
377 &bd2802_reg0x09_attr,
378 &bd2802_reg0x0a_attr,
379 &bd2802_reg0x0b_attr,
380 &bd2802_reg0x0c_attr,
381 &bd2802_reg0x0d_attr,
382 &bd2802_reg0x0e_attr,
383 &bd2802_reg0x0f_attr,
384 &bd2802_reg0x10_attr,
385 &bd2802_reg0x11_attr,
386 &bd2802_reg0x12_attr,
387 &bd2802_reg0x13_attr,
388 &bd2802_reg0x14_attr,
389 &bd2802_reg0x15_attr,
390 };
391
392 static void bd2802_enable_adv_conf(struct bd2802_led *led)
393 {
394 int i, ret;
395
396 for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++) {
397 ret = device_create_file(&led->client->dev,
398 bd2802_addr_attributes[i]);
399 if (ret) {
400 dev_err(&led->client->dev, "failed: sysfs file %s\n",
401 bd2802_addr_attributes[i]->attr.name);
402 goto failed_remove_files;
403 }
404 }
405
406 if (bd2802_is_all_off(led))
407 bd2802_reset_cancel(led);
408
409 led->adf_on = 1;
410
411 return;
412
413 failed_remove_files:
414 for (i--; i >= 0; i--)
415 device_remove_file(&led->client->dev,
416 bd2802_addr_attributes[i]);
417 }
418
419 static void bd2802_disable_adv_conf(struct bd2802_led *led)
420 {
421 int i;
422
423 for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++)
424 device_remove_file(&led->client->dev,
425 bd2802_addr_attributes[i]);
426
427 if (bd2802_is_all_off(led))
428 gpio_set_value(led->pdata->reset_gpio, 0);
429
430 led->adf_on = 0;
431 }
432
433 static ssize_t bd2802_show_adv_conf(struct device *dev,
434 struct device_attribute *attr, char *buf)
435 {
436 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
437 ssize_t ret;
438
439 down_read(&led->rwsem);
440 if (led->adf_on)
441 ret = sprintf(buf, "on\n");
442 else
443 ret = sprintf(buf, "off\n");
444 up_read(&led->rwsem);
445
446 return ret;
447 }
448
449 static ssize_t bd2802_store_adv_conf(struct device *dev,
450 struct device_attribute *attr, const char *buf, size_t count)
451 {
452 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
453
454 if (!count)
455 return -EINVAL;
456
457 down_write(&led->rwsem);
458 if (!led->adf_on && !strncmp(buf, "on", 2))
459 bd2802_enable_adv_conf(led);
460 else if (led->adf_on && !strncmp(buf, "off", 3))
461 bd2802_disable_adv_conf(led);
462 up_write(&led->rwsem);
463
464 return count;
465 }
466
467 static struct device_attribute bd2802_adv_conf_attr = {
468 .attr = {
469 .name = "advanced_configuration",
470 .mode = 0644,
471 },
472 .show = bd2802_show_adv_conf,
473 .store = bd2802_store_adv_conf,
474 };
475
476 #define BD2802_CONTROL_ATTR(attr_name, name_str) \
477 static ssize_t bd2802_show_##attr_name(struct device *dev, \
478 struct device_attribute *attr, char *buf) \
479 { \
480 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
481 ssize_t ret; \
482 down_read(&led->rwsem); \
483 ret = sprintf(buf, "0x%02x\n", led->attr_name); \
484 up_read(&led->rwsem); \
485 return ret; \
486 } \
487 static ssize_t bd2802_store_##attr_name(struct device *dev, \
488 struct device_attribute *attr, const char *buf, size_t count) \
489 { \
490 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
491 unsigned long val; \
492 int ret; \
493 if (!count) \
494 return -EINVAL; \
495 ret = kstrtoul(buf, 16, &val); \
496 if (ret) \
497 return ret; \
498 down_write(&led->rwsem); \
499 led->attr_name = val; \
500 up_write(&led->rwsem); \
501 return count; \
502 } \
503 static struct device_attribute bd2802_##attr_name##_attr = { \
504 .attr = { \
505 .name = name_str, \
506 .mode = 0644, \
507 }, \
508 .show = bd2802_show_##attr_name, \
509 .store = bd2802_store_##attr_name, \
510 };
511
512 BD2802_CONTROL_ATTR(wave_pattern, "wave_pattern");
513 BD2802_CONTROL_ATTR(rgb_current, "rgb_current");
514
515 static struct device_attribute *bd2802_attributes[] = {
516 &bd2802_adv_conf_attr,
517 &bd2802_wave_pattern_attr,
518 &bd2802_rgb_current_attr,
519 };
520
521 static void bd2802_led_work(struct work_struct *work)
522 {
523 struct bd2802_led *led = container_of(work, struct bd2802_led, work);
524
525 if (led->state)
526 bd2802_turn_on(led, led->led_id, led->color, led->state);
527 else
528 bd2802_turn_off(led, led->led_id, led->color);
529 }
530
531 #define BD2802_CONTROL_RGBS(name, id, clr) \
532 static void bd2802_set_##name##_brightness(struct led_classdev *led_cdev,\
533 enum led_brightness value) \
534 { \
535 struct bd2802_led *led = \
536 container_of(led_cdev, struct bd2802_led, cdev_##name); \
537 led->led_id = id; \
538 led->color = clr; \
539 if (value == LED_OFF) \
540 led->state = BD2802_OFF; \
541 else \
542 led->state = BD2802_ON; \
543 schedule_work(&led->work); \
544 } \
545 static int bd2802_set_##name##_blink(struct led_classdev *led_cdev, \
546 unsigned long *delay_on, unsigned long *delay_off) \
547 { \
548 struct bd2802_led *led = \
549 container_of(led_cdev, struct bd2802_led, cdev_##name); \
550 if (*delay_on == 0 || *delay_off == 0) \
551 return -EINVAL; \
552 led->led_id = id; \
553 led->color = clr; \
554 led->state = BD2802_BLINK; \
555 schedule_work(&led->work); \
556 return 0; \
557 }
558
559 BD2802_CONTROL_RGBS(led1r, LED1, RED);
560 BD2802_CONTROL_RGBS(led1g, LED1, GREEN);
561 BD2802_CONTROL_RGBS(led1b, LED1, BLUE);
562 BD2802_CONTROL_RGBS(led2r, LED2, RED);
563 BD2802_CONTROL_RGBS(led2g, LED2, GREEN);
564 BD2802_CONTROL_RGBS(led2b, LED2, BLUE);
565
566 static int bd2802_register_led_classdev(struct bd2802_led *led)
567 {
568 int ret;
569
570 INIT_WORK(&led->work, bd2802_led_work);
571
572 led->cdev_led1r.name = "led1_R";
573 led->cdev_led1r.brightness = LED_OFF;
574 led->cdev_led1r.brightness_set = bd2802_set_led1r_brightness;
575 led->cdev_led1r.blink_set = bd2802_set_led1r_blink;
576
577 ret = led_classdev_register(&led->client->dev, &led->cdev_led1r);
578 if (ret < 0) {
579 dev_err(&led->client->dev, "couldn't register LED %s\n",
580 led->cdev_led1r.name);
581 goto failed_unregister_led1_R;
582 }
583
584 led->cdev_led1g.name = "led1_G";
585 led->cdev_led1g.brightness = LED_OFF;
586 led->cdev_led1g.brightness_set = bd2802_set_led1g_brightness;
587 led->cdev_led1g.blink_set = bd2802_set_led1g_blink;
588
589 ret = led_classdev_register(&led->client->dev, &led->cdev_led1g);
590 if (ret < 0) {
591 dev_err(&led->client->dev, "couldn't register LED %s\n",
592 led->cdev_led1g.name);
593 goto failed_unregister_led1_G;
594 }
595
596 led->cdev_led1b.name = "led1_B";
597 led->cdev_led1b.brightness = LED_OFF;
598 led->cdev_led1b.brightness_set = bd2802_set_led1b_brightness;
599 led->cdev_led1b.blink_set = bd2802_set_led1b_blink;
600
601 ret = led_classdev_register(&led->client->dev, &led->cdev_led1b);
602 if (ret < 0) {
603 dev_err(&led->client->dev, "couldn't register LED %s\n",
604 led->cdev_led1b.name);
605 goto failed_unregister_led1_B;
606 }
607
608 led->cdev_led2r.name = "led2_R";
609 led->cdev_led2r.brightness = LED_OFF;
610 led->cdev_led2r.brightness_set = bd2802_set_led2r_brightness;
611 led->cdev_led2r.blink_set = bd2802_set_led2r_blink;
612
613 ret = led_classdev_register(&led->client->dev, &led->cdev_led2r);
614 if (ret < 0) {
615 dev_err(&led->client->dev, "couldn't register LED %s\n",
616 led->cdev_led2r.name);
617 goto failed_unregister_led2_R;
618 }
619
620 led->cdev_led2g.name = "led2_G";
621 led->cdev_led2g.brightness = LED_OFF;
622 led->cdev_led2g.brightness_set = bd2802_set_led2g_brightness;
623 led->cdev_led2g.blink_set = bd2802_set_led2g_blink;
624
625 ret = led_classdev_register(&led->client->dev, &led->cdev_led2g);
626 if (ret < 0) {
627 dev_err(&led->client->dev, "couldn't register LED %s\n",
628 led->cdev_led2g.name);
629 goto failed_unregister_led2_G;
630 }
631
632 led->cdev_led2b.name = "led2_B";
633 led->cdev_led2b.brightness = LED_OFF;
634 led->cdev_led2b.brightness_set = bd2802_set_led2b_brightness;
635 led->cdev_led2b.blink_set = bd2802_set_led2b_blink;
636 led->cdev_led2b.flags |= LED_CORE_SUSPENDRESUME;
637
638 ret = led_classdev_register(&led->client->dev, &led->cdev_led2b);
639 if (ret < 0) {
640 dev_err(&led->client->dev, "couldn't register LED %s\n",
641 led->cdev_led2b.name);
642 goto failed_unregister_led2_B;
643 }
644
645 return 0;
646
647 failed_unregister_led2_B:
648 led_classdev_unregister(&led->cdev_led2g);
649 failed_unregister_led2_G:
650 led_classdev_unregister(&led->cdev_led2r);
651 failed_unregister_led2_R:
652 led_classdev_unregister(&led->cdev_led1b);
653 failed_unregister_led1_B:
654 led_classdev_unregister(&led->cdev_led1g);
655 failed_unregister_led1_G:
656 led_classdev_unregister(&led->cdev_led1r);
657 failed_unregister_led1_R:
658
659 return ret;
660 }
661
662 static void bd2802_unregister_led_classdev(struct bd2802_led *led)
663 {
664 cancel_work_sync(&led->work);
665 led_classdev_unregister(&led->cdev_led2b);
666 led_classdev_unregister(&led->cdev_led2g);
667 led_classdev_unregister(&led->cdev_led2r);
668 led_classdev_unregister(&led->cdev_led1b);
669 led_classdev_unregister(&led->cdev_led1g);
670 led_classdev_unregister(&led->cdev_led1r);
671 }
672
673 static int bd2802_probe(struct i2c_client *client,
674 const struct i2c_device_id *id)
675 {
676 struct bd2802_led *led;
677 struct bd2802_led_platform_data *pdata;
678 int ret, i;
679
680 led = devm_kzalloc(&client->dev, sizeof(struct bd2802_led), GFP_KERNEL);
681 if (!led)
682 return -ENOMEM;
683
684 led->client = client;
685 pdata = led->pdata = dev_get_platdata(&client->dev);
686 i2c_set_clientdata(client, led);
687
688 /* Configure RESET GPIO (L: RESET, H: RESET cancel) */
689 gpio_request_one(pdata->reset_gpio, GPIOF_OUT_INIT_HIGH, "RGB_RESETB");
690
691 /* Tacss = min 0.1ms */
692 udelay(100);
693
694 /* Detect BD2802GU */
695 ret = bd2802_write_byte(client, BD2802_REG_CLKSETUP, 0x00);
696 if (ret < 0) {
697 dev_err(&client->dev, "failed to detect device\n");
698 return ret;
699 } else
700 dev_info(&client->dev, "return 0x%02x\n", ret);
701
702 /* To save the power, reset BD2802 after detecting */
703 gpio_set_value(led->pdata->reset_gpio, 0);
704
705 /* Default attributes */
706 led->wave_pattern = BD2802_PATTERN_HALF;
707 led->rgb_current = BD2802_CURRENT_032;
708
709 init_rwsem(&led->rwsem);
710
711 for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) {
712 ret = device_create_file(&led->client->dev,
713 bd2802_attributes[i]);
714 if (ret) {
715 dev_err(&led->client->dev, "failed: sysfs file %s\n",
716 bd2802_attributes[i]->attr.name);
717 goto failed_unregister_dev_file;
718 }
719 }
720
721 ret = bd2802_register_led_classdev(led);
722 if (ret < 0)
723 goto failed_unregister_dev_file;
724
725 return 0;
726
727 failed_unregister_dev_file:
728 for (i--; i >= 0; i--)
729 device_remove_file(&led->client->dev, bd2802_attributes[i]);
730 return ret;
731 }
732
733 static int bd2802_remove(struct i2c_client *client)
734 {
735 struct bd2802_led *led = i2c_get_clientdata(client);
736 int i;
737
738 gpio_set_value(led->pdata->reset_gpio, 0);
739 bd2802_unregister_led_classdev(led);
740 if (led->adf_on)
741 bd2802_disable_adv_conf(led);
742 for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++)
743 device_remove_file(&led->client->dev, bd2802_attributes[i]);
744
745 return 0;
746 }
747
748 #ifdef CONFIG_PM_SLEEP
749 static void bd2802_restore_state(struct bd2802_led *led)
750 {
751 int i;
752
753 for (i = 0; i < LED_NUM; i++) {
754 if (led->led[i].r)
755 bd2802_turn_on(led, i, RED, led->led[i].r);
756 if (led->led[i].g)
757 bd2802_turn_on(led, i, GREEN, led->led[i].g);
758 if (led->led[i].b)
759 bd2802_turn_on(led, i, BLUE, led->led[i].b);
760 }
761 }
762
763 static int bd2802_suspend(struct device *dev)
764 {
765 struct i2c_client *client = to_i2c_client(dev);
766 struct bd2802_led *led = i2c_get_clientdata(client);
767
768 gpio_set_value(led->pdata->reset_gpio, 0);
769
770 return 0;
771 }
772
773 static int bd2802_resume(struct device *dev)
774 {
775 struct i2c_client *client = to_i2c_client(dev);
776 struct bd2802_led *led = i2c_get_clientdata(client);
777
778 if (!bd2802_is_all_off(led) || led->adf_on) {
779 bd2802_reset_cancel(led);
780 bd2802_restore_state(led);
781 }
782
783 return 0;
784 }
785 #endif
786
787 static SIMPLE_DEV_PM_OPS(bd2802_pm, bd2802_suspend, bd2802_resume);
788
789 static const struct i2c_device_id bd2802_id[] = {
790 { "BD2802", 0 },
791 { }
792 };
793 MODULE_DEVICE_TABLE(i2c, bd2802_id);
794
795 static struct i2c_driver bd2802_i2c_driver = {
796 .driver = {
797 .name = "BD2802",
798 .pm = &bd2802_pm,
799 },
800 .probe = bd2802_probe,
801 .remove = bd2802_remove,
802 .id_table = bd2802_id,
803 };
804
805 module_i2c_driver(bd2802_i2c_driver);
806
807 MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>");
808 MODULE_DESCRIPTION("BD2802 LED driver");
809 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support