m68k: fix __page_to_pfn for a const struct page argument
[linux-2.6.git] / drivers / leds / leds-bd2802.c
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 = strict_strtoul(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 = strict_strtoul(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_led1r);
666 }
667
668 static int __devinit bd2802_probe(struct i2c_client *client,
669                         const struct i2c_device_id *id)
670 {
671         struct bd2802_led *led;
672         struct bd2802_led_platform_data *pdata;
673         int ret, i;
674
675         led = kzalloc(sizeof(struct bd2802_led), GFP_KERNEL);
676         if (!led) {
677                 dev_err(&client->dev, "failed to allocate driver data\n");
678                 return -ENOMEM;
679         }
680
681         led->client = client;
682         pdata = led->pdata = client->dev.platform_data;
683         i2c_set_clientdata(client, led);
684
685         /* Configure RESET GPIO (L: RESET, H: RESET cancel) */
686         gpio_request(pdata->reset_gpio, "RGB_RESETB");
687         gpio_direction_output(pdata->reset_gpio, 1);
688
689         /* Tacss = min 0.1ms */
690         udelay(100);
691
692         /* Detect BD2802GU */
693         ret = bd2802_write_byte(client, BD2802_REG_CLKSETUP, 0x00);
694         if (ret < 0) {
695                 dev_err(&client->dev, "failed to detect device\n");
696                 goto failed_free;
697         } else
698                 dev_info(&client->dev, "return 0x%02x\n", ret);
699
700         /* To save the power, reset BD2802 after detecting */
701         gpio_set_value(led->pdata->reset_gpio, 0);
702
703         /* Default attributes */
704         led->wave_pattern = BD2802_PATTERN_HALF;
705         led->rgb_current = BD2802_CURRENT_032;
706
707         init_rwsem(&led->rwsem);
708
709         for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) {
710                 ret = device_create_file(&led->client->dev,
711                                                 bd2802_attributes[i]);
712                 if (ret) {
713                         dev_err(&led->client->dev, "failed: sysfs file %s\n",
714                                         bd2802_attributes[i]->attr.name);
715                         goto failed_unregister_dev_file;
716                 }
717         }
718
719         ret = bd2802_register_led_classdev(led);
720         if (ret < 0)
721                 goto failed_unregister_dev_file;
722
723         return 0;
724
725 failed_unregister_dev_file:
726         for (i--; i >= 0; i--)
727                 device_remove_file(&led->client->dev, bd2802_attributes[i]);
728 failed_free:
729         kfree(led);
730
731         return ret;
732 }
733
734 static int __exit bd2802_remove(struct i2c_client *client)
735 {
736         struct bd2802_led *led = i2c_get_clientdata(client);
737         int i;
738
739         gpio_set_value(led->pdata->reset_gpio, 0);
740         bd2802_unregister_led_classdev(led);
741         if (led->adf_on)
742                 bd2802_disable_adv_conf(led);
743         for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++)
744                 device_remove_file(&led->client->dev, bd2802_attributes[i]);
745         kfree(led);
746
747         return 0;
748 }
749
750 #ifdef CONFIG_PM
751
752 static void bd2802_restore_state(struct bd2802_led *led)
753 {
754         int i;
755
756         for (i = 0; i < LED_NUM; i++) {
757                 if (led->led[i].r)
758                         bd2802_turn_on(led, i, RED, led->led[i].r);
759                 if (led->led[i].g)
760                         bd2802_turn_on(led, i, GREEN, led->led[i].g);
761                 if (led->led[i].b)
762                         bd2802_turn_on(led, i, BLUE, led->led[i].b);
763         }
764 }
765
766 static int bd2802_suspend(struct device *dev)
767 {
768         struct i2c_client *client = to_i2c_client(dev);
769         struct bd2802_led *led = i2c_get_clientdata(client);
770
771         gpio_set_value(led->pdata->reset_gpio, 0);
772
773         return 0;
774 }
775
776 static int bd2802_resume(struct device *dev)
777 {
778         struct i2c_client *client = to_i2c_client(dev);
779         struct bd2802_led *led = i2c_get_clientdata(client);
780
781         if (!bd2802_is_all_off(led) || led->adf_on) {
782                 bd2802_reset_cancel(led);
783                 bd2802_restore_state(led);
784         }
785
786         return 0;
787 }
788
789 static SIMPLE_DEV_PM_OPS(bd2802_pm, bd2802_suspend, bd2802_resume);
790 #define BD2802_PM (&bd2802_pm)
791 #else           /* CONFIG_PM */
792 #define BD2802_PM NULL
793 #endif
794
795 static const struct i2c_device_id bd2802_id[] = {
796         { "BD2802", 0 },
797         { }
798 };
799 MODULE_DEVICE_TABLE(i2c, bd2802_id);
800
801 static struct i2c_driver bd2802_i2c_driver = {
802         .driver = {
803                 .name   = "BD2802",
804                 .pm     = BD2802_PM,
805         },
806         .probe          = bd2802_probe,
807         .remove         = __exit_p(bd2802_remove),
808         .id_table       = bd2802_id,
809 };
810
811 static int __init bd2802_init(void)
812 {
813         return i2c_add_driver(&bd2802_i2c_driver);
814 }
815 module_init(bd2802_init);
816
817 static void __exit bd2802_exit(void)
818 {
819         i2c_del_driver(&bd2802_i2c_driver);
820 }
821 module_exit(bd2802_exit);
822
823 MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>");
824 MODULE_DESCRIPTION("BD2802 LED driver");
825 MODULE_LICENSE("GPL v2");