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Merge branch 'mini2440-dev-unlikely' into mini2440-dev
[linux-2.6/mini2440.git] / drivers / leds / leds-bd2802.c
blob779d7f262c04c39f1355e0dd2a190ca02fb067e3
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
22
23 #define LED_CTL(rgb2en, rgb1en) ((rgb2en) << 4 | ((rgb1en) << 0))
24
25 #define BD2802_LED_OFFSET 0xa
26 #define BD2802_COLOR_OFFSET 0x3
27
28 #define BD2802_REG_CLKSETUP 0x00
29 #define BD2802_REG_CONTROL 0x01
30 #define BD2802_REG_HOURSETUP 0x02
31 #define BD2802_REG_CURRENT1SETUP 0x03
32 #define BD2802_REG_CURRENT2SETUP 0x04
33 #define BD2802_REG_WAVEPATTERN 0x05
34
35 #define BD2802_CURRENT_032 0x10 /* 3.2mA */
36 #define BD2802_CURRENT_000 0x00 /* 0.0mA */
37
38 #define BD2802_PATTERN_FULL 0x07
39 #define BD2802_PATTERN_HALF 0x03
40
41 enum led_ids {
42 LED1,
43 LED2,
44 LED_NUM,
45 };
46
47 enum led_colors {
48 RED,
49 GREEN,
50 BLUE,
51 };
52
53 enum led_bits {
54 BD2802_OFF,
55 BD2802_BLINK,
56 BD2802_ON,
57 };
58
59 /*
60 * State '0' : 'off'
61 * State '1' : 'blink'
62 * State '2' : 'on'.
63 */
64 struct led_state {
65 unsigned r:2;
66 unsigned g:2;
67 unsigned b:2;
68 };
69
70 struct bd2802_led {
71 struct bd2802_led_platform_data *pdata;
72 struct i2c_client *client;
73 struct rw_semaphore rwsem;
74 struct work_struct work;
75
76 struct led_state led[2];
77
78 /*
79 * Making led_classdev as array is not recommended, because array
80 * members prevent using 'container_of' macro. So repetitive works
81 * are needed.
82 */
83 struct led_classdev cdev_led1r;
84 struct led_classdev cdev_led1g;
85 struct led_classdev cdev_led1b;
86 struct led_classdev cdev_led2r;
87 struct led_classdev cdev_led2g;
88 struct led_classdev cdev_led2b;
89
90 /*
91 * Advanced Configuration Function(ADF) mode:
92 * In ADF mode, user can set registers of BD2802GU directly,
93 * therefore BD2802GU doesn't enter reset state.
94 */
95 int adf_on;
96
97 enum led_ids led_id;
98 enum led_colors color;
99 enum led_bits state;
100
101 /* General attributes of RGB LEDs */
102 int wave_pattern;
103 int rgb_current;
104 };
105
106
107 /*--------------------------------------------------------------*/
108 /* BD2802GU helper functions */
109 /*--------------------------------------------------------------*/
110
111 static inline int bd2802_is_rgb_off(struct bd2802_led *led, enum led_ids id,
112 enum led_colors color)
113 {
114 switch (color) {
115 case RED:
116 return !led->led[id].r;
117 case GREEN:
118 return !led->led[id].g;
119 case BLUE:
120 return !led->led[id].b;
121 default:
122 dev_err(&led->client->dev, "%s: Invalid color\n", __func__);
123 return -EINVAL;
124 }
125 }
126
127 static inline int bd2802_is_led_off(struct bd2802_led *led, enum led_ids id)
128 {
129 if (led->led[id].r || led->led[id].g || led->led[id].b)
130 return 0;
131
132 return 1;
133 }
134
135 static inline int bd2802_is_all_off(struct bd2802_led *led)
136 {
137 int i;
138
139 for (i = 0; i < LED_NUM; i++)
140 if (!bd2802_is_led_off(led, i))
141 return 0;
142
143 return 1;
144 }
145
146 static inline u8 bd2802_get_base_offset(enum led_ids id, enum led_colors color)
147 {
148 return id * BD2802_LED_OFFSET + color * BD2802_COLOR_OFFSET;
149 }
150
151 static inline u8 bd2802_get_reg_addr(enum led_ids id, enum led_colors color,
152 u8 reg_offset)
153 {
154 return reg_offset + bd2802_get_base_offset(id, color);
155 }
156
157
158 /*--------------------------------------------------------------*/
159 /* BD2802GU core functions */
160 /*--------------------------------------------------------------*/
161
162 static int bd2802_write_byte(struct i2c_client *client, u8 reg, u8 val)
163 {
164 int ret = i2c_smbus_write_byte_data(client, reg, val);
165 if (ret >= 0)
166 return 0;
167
168 dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
169 __func__, reg, val, ret);
170
171 return ret;
172 }
173
174 static void bd2802_update_state(struct bd2802_led *led, enum led_ids id,
175 enum led_colors color, enum led_bits led_bit)
176 {
177 int i;
178 u8 value;
179
180 for (i = 0; i < LED_NUM; i++) {
181 if (i == id) {
182 switch (color) {
183 case RED:
184 led->led[i].r = led_bit;
185 break;
186 case GREEN:
187 led->led[i].g = led_bit;
188 break;
189 case BLUE:
190 led->led[i].b = led_bit;
191 break;
192 default:
193 dev_err(&led->client->dev,
194 "%s: Invalid color\n", __func__);
195 return;
196 }
197 }
198 }
199
200 if (led_bit == BD2802_BLINK || led_bit == BD2802_ON)
201 return;
202
203 if (!bd2802_is_led_off(led, id))
204 return;
205
206 if (bd2802_is_all_off(led) && !led->adf_on) {
207 gpio_set_value(led->pdata->reset_gpio, 0);
208 return;
209 }
210
211 /*
212 * In this case, other led is turned on, and current led is turned
213 * off. So set RGB LED Control register to stop the current RGB LED
214 */
215 value = (id == LED1) ? LED_CTL(1, 0) : LED_CTL(0, 1);
216 bd2802_write_byte(led->client, BD2802_REG_CONTROL, value);
217 }
218
219 static void bd2802_configure(struct bd2802_led *led)
220 {
221 struct bd2802_led_platform_data *pdata = led->pdata;
222 u8 reg;
223
224 reg = bd2802_get_reg_addr(LED1, RED, BD2802_REG_HOURSETUP);
225 bd2802_write_byte(led->client, reg, pdata->rgb_time);
226
227 reg = bd2802_get_reg_addr(LED2, RED, BD2802_REG_HOURSETUP);
228 bd2802_write_byte(led->client, reg, pdata->rgb_time);
229 }
230
231 static void bd2802_reset_cancel(struct bd2802_led *led)
232 {
233 gpio_set_value(led->pdata->reset_gpio, 1);
234 udelay(100);
235 bd2802_configure(led);
236 }
237
238 static void bd2802_enable(struct bd2802_led *led, enum led_ids id)
239 {
240 enum led_ids other_led = (id == LED1) ? LED2 : LED1;
241 u8 value, other_led_on;
242
243 other_led_on = !bd2802_is_led_off(led, other_led);
244 if (id == LED1)
245 value = LED_CTL(other_led_on, 1);
246 else
247 value = LED_CTL(1 , other_led_on);
248
249 bd2802_write_byte(led->client, BD2802_REG_CONTROL, value);
250 }
251
252 static void bd2802_set_on(struct bd2802_led *led, enum led_ids id,
253 enum led_colors color)
254 {
255 u8 reg;
256
257 if (bd2802_is_all_off(led) && !led->adf_on)
258 bd2802_reset_cancel(led);
259
260 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
261 bd2802_write_byte(led->client, reg, led->rgb_current);
262 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
263 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
264 reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN);
265 bd2802_write_byte(led->client, reg, BD2802_PATTERN_FULL);
266
267 bd2802_enable(led, id);
268 bd2802_update_state(led, id, color, BD2802_ON);
269 }
270
271 static void bd2802_set_blink(struct bd2802_led *led, enum led_ids id,
272 enum led_colors color)
273 {
274 u8 reg;
275
276 if (bd2802_is_all_off(led) && !led->adf_on)
277 bd2802_reset_cancel(led);
278
279 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
280 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
281 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
282 bd2802_write_byte(led->client, reg, led->rgb_current);
283 reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN);
284 bd2802_write_byte(led->client, reg, led->wave_pattern);
285
286 bd2802_enable(led, id);
287 bd2802_update_state(led, id, color, BD2802_BLINK);
288 }
289
290 static void bd2802_turn_on(struct bd2802_led *led, enum led_ids id,
291 enum led_colors color, enum led_bits led_bit)
292 {
293 if (led_bit == BD2802_OFF) {
294 dev_err(&led->client->dev,
295 "Only 'blink' and 'on' are allowed\n");
296 return;
297 }
298
299 if (led_bit == BD2802_BLINK)
300 bd2802_set_blink(led, id, color);
301 else
302 bd2802_set_on(led, id, color);
303 }
304
305 static void bd2802_turn_off(struct bd2802_led *led, enum led_ids id,
306 enum led_colors color)
307 {
308 u8 reg;
309
310 if (bd2802_is_rgb_off(led, id, color))
311 return;
312
313 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
314 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
315 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
316 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
317
318 bd2802_update_state(led, id, color, BD2802_OFF);
319 }
320
321 static void bd2802_restore_state(struct bd2802_led *led)
322 {
323 int i;
324
325 for (i = 0; i < LED_NUM; i++) {
326 if (led->led[i].r)
327 bd2802_turn_on(led, i, RED, led->led[i].r);
328 if (led->led[i].g)
329 bd2802_turn_on(led, i, GREEN, led->led[i].g);
330 if (led->led[i].b)
331 bd2802_turn_on(led, i, BLUE, led->led[i].b);
332 }
333 }
334
335 #define BD2802_SET_REGISTER(reg_addr, reg_name) \
336 static ssize_t bd2802_store_reg##reg_addr(struct device *dev, \
337 struct device_attribute *attr, const char *buf, size_t count) \
338 { \
339 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
340 unsigned long val; \
341 int ret; \
342 if (!count) \
343 return -EINVAL; \
344 ret = strict_strtoul(buf, 16, &val); \
345 if (ret) \
346 return ret; \
347 down_write(&led->rwsem); \
348 bd2802_write_byte(led->client, reg_addr, (u8) val); \
349 up_write(&led->rwsem); \
350 return count; \
351 } \
352 static struct device_attribute bd2802_reg##reg_addr##_attr = { \
353 .attr = {.name = reg_name, .mode = 0644, .owner = THIS_MODULE}, \
354 .store = bd2802_store_reg##reg_addr, \
355 };
356
357 BD2802_SET_REGISTER(0x00, "0x00");
358 BD2802_SET_REGISTER(0x01, "0x01");
359 BD2802_SET_REGISTER(0x02, "0x02");
360 BD2802_SET_REGISTER(0x03, "0x03");
361 BD2802_SET_REGISTER(0x04, "0x04");
362 BD2802_SET_REGISTER(0x05, "0x05");
363 BD2802_SET_REGISTER(0x06, "0x06");
364 BD2802_SET_REGISTER(0x07, "0x07");
365 BD2802_SET_REGISTER(0x08, "0x08");
366 BD2802_SET_REGISTER(0x09, "0x09");
367 BD2802_SET_REGISTER(0x0a, "0x0a");
368 BD2802_SET_REGISTER(0x0b, "0x0b");
369 BD2802_SET_REGISTER(0x0c, "0x0c");
370 BD2802_SET_REGISTER(0x0d, "0x0d");
371 BD2802_SET_REGISTER(0x0e, "0x0e");
372 BD2802_SET_REGISTER(0x0f, "0x0f");
373 BD2802_SET_REGISTER(0x10, "0x10");
374 BD2802_SET_REGISTER(0x11, "0x11");
375 BD2802_SET_REGISTER(0x12, "0x12");
376 BD2802_SET_REGISTER(0x13, "0x13");
377 BD2802_SET_REGISTER(0x14, "0x14");
378 BD2802_SET_REGISTER(0x15, "0x15");
379
380 static struct device_attribute *bd2802_addr_attributes[] = {
381 &bd2802_reg0x00_attr,
382 &bd2802_reg0x01_attr,
383 &bd2802_reg0x02_attr,
384 &bd2802_reg0x03_attr,
385 &bd2802_reg0x04_attr,
386 &bd2802_reg0x05_attr,
387 &bd2802_reg0x06_attr,
388 &bd2802_reg0x07_attr,
389 &bd2802_reg0x08_attr,
390 &bd2802_reg0x09_attr,
391 &bd2802_reg0x0a_attr,
392 &bd2802_reg0x0b_attr,
393 &bd2802_reg0x0c_attr,
394 &bd2802_reg0x0d_attr,
395 &bd2802_reg0x0e_attr,
396 &bd2802_reg0x0f_attr,
397 &bd2802_reg0x10_attr,
398 &bd2802_reg0x11_attr,
399 &bd2802_reg0x12_attr,
400 &bd2802_reg0x13_attr,
401 &bd2802_reg0x14_attr,
402 &bd2802_reg0x15_attr,
403 };
404
405 static void bd2802_enable_adv_conf(struct bd2802_led *led)
406 {
407 int i, ret;
408
409 for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++) {
410 ret = device_create_file(&led->client->dev,
411 bd2802_addr_attributes[i]);
412 if (ret) {
413 dev_err(&led->client->dev, "failed: sysfs file %s\n",
414 bd2802_addr_attributes[i]->attr.name);
415 goto failed_remove_files;
416 }
417 }
418
419 if (bd2802_is_all_off(led))
420 bd2802_reset_cancel(led);
421
422 led->adf_on = 1;
423
424 return;
425
426 failed_remove_files:
427 for (i--; i >= 0; i--)
428 device_remove_file(&led->client->dev,
429 bd2802_addr_attributes[i]);
430 }
431
432 static void bd2802_disable_adv_conf(struct bd2802_led *led)
433 {
434 int i;
435
436 for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++)
437 device_remove_file(&led->client->dev,
438 bd2802_addr_attributes[i]);
439
440 if (bd2802_is_all_off(led))
441 gpio_set_value(led->pdata->reset_gpio, 0);
442
443 led->adf_on = 0;
444 }
445
446 static ssize_t bd2802_show_adv_conf(struct device *dev,
447 struct device_attribute *attr, char *buf)
448 {
449 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
450 ssize_t ret;
451
452 down_read(&led->rwsem);
453 if (led->adf_on)
454 ret = sprintf(buf, "on\n");
455 else
456 ret = sprintf(buf, "off\n");
457 up_read(&led->rwsem);
458
459 return ret;
460 }
461
462 static ssize_t bd2802_store_adv_conf(struct device *dev,
463 struct device_attribute *attr, const char *buf, size_t count)
464 {
465 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
466
467 if (!count)
468 return -EINVAL;
469
470 down_write(&led->rwsem);
471 if (!led->adf_on && !strncmp(buf, "on", 2))
472 bd2802_enable_adv_conf(led);
473 else if (led->adf_on && !strncmp(buf, "off", 3))
474 bd2802_disable_adv_conf(led);
475 up_write(&led->rwsem);
476
477 return count;
478 }
479
480 static struct device_attribute bd2802_adv_conf_attr = {
481 .attr = {
482 .name = "advanced_configuration",
483 .mode = 0644,
484 .owner = THIS_MODULE
485 },
486 .show = bd2802_show_adv_conf,
487 .store = bd2802_store_adv_conf,
488 };
489
490 #define BD2802_CONTROL_ATTR(attr_name, name_str) \
491 static ssize_t bd2802_show_##attr_name(struct device *dev, \
492 struct device_attribute *attr, char *buf) \
493 { \
494 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
495 ssize_t ret; \
496 down_read(&led->rwsem); \
497 ret = sprintf(buf, "0x%02x\n", led->attr_name); \
498 up_read(&led->rwsem); \
499 return ret; \
500 } \
501 static ssize_t bd2802_store_##attr_name(struct device *dev, \
502 struct device_attribute *attr, const char *buf, size_t count) \
503 { \
504 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
505 unsigned long val; \
506 int ret; \
507 if (!count) \
508 return -EINVAL; \
509 ret = strict_strtoul(buf, 16, &val); \
510 if (ret) \
511 return ret; \
512 down_write(&led->rwsem); \
513 led->attr_name = val; \
514 up_write(&led->rwsem); \
515 return count; \
516 } \
517 static struct device_attribute bd2802_##attr_name##_attr = { \
518 .attr = { \
519 .name = name_str, \
520 .mode = 0644, \
521 .owner = THIS_MODULE \
522 }, \
523 .show = bd2802_show_##attr_name, \
524 .store = bd2802_store_##attr_name, \
525 };
526
527 BD2802_CONTROL_ATTR(wave_pattern, "wave_pattern");
528 BD2802_CONTROL_ATTR(rgb_current, "rgb_current");
529
530 static struct device_attribute *bd2802_attributes[] = {
531 &bd2802_adv_conf_attr,
532 &bd2802_wave_pattern_attr,
533 &bd2802_rgb_current_attr,
534 };
535
536 static void bd2802_led_work(struct work_struct *work)
537 {
538 struct bd2802_led *led = container_of(work, struct bd2802_led, work);
539
540 if (led->state)
541 bd2802_turn_on(led, led->led_id, led->color, led->state);
542 else
543 bd2802_turn_off(led, led->led_id, led->color);
544 }
545
546 #define BD2802_CONTROL_RGBS(name, id, clr) \
547 static void bd2802_set_##name##_brightness(struct led_classdev *led_cdev,\
548 enum led_brightness value) \
549 { \
550 struct bd2802_led *led = \
551 container_of(led_cdev, struct bd2802_led, cdev_##name); \
552 led->led_id = id; \
553 led->color = clr; \
554 if (value == LED_OFF) \
555 led->state = BD2802_OFF; \
556 else \
557 led->state = BD2802_ON; \
558 schedule_work(&led->work); \
559 } \
560 static int bd2802_set_##name##_blink(struct led_classdev *led_cdev, \
561 unsigned long *delay_on, unsigned long *delay_off) \
562 { \
563 struct bd2802_led *led = \
564 container_of(led_cdev, struct bd2802_led, cdev_##name); \
565 if (*delay_on == 0 || *delay_off == 0) \
566 return -EINVAL; \
567 led->led_id = id; \
568 led->color = clr; \
569 led->state = BD2802_BLINK; \
570 schedule_work(&led->work); \
571 return 0; \
572 }
573
574 BD2802_CONTROL_RGBS(led1r, LED1, RED);
575 BD2802_CONTROL_RGBS(led1g, LED1, GREEN);
576 BD2802_CONTROL_RGBS(led1b, LED1, BLUE);
577 BD2802_CONTROL_RGBS(led2r, LED2, RED);
578 BD2802_CONTROL_RGBS(led2g, LED2, GREEN);
579 BD2802_CONTROL_RGBS(led2b, LED2, BLUE);
580
581 static int bd2802_register_led_classdev(struct bd2802_led *led)
582 {
583 int ret;
584
585 INIT_WORK(&led->work, bd2802_led_work);
586
587 led->cdev_led1r.name = "led1_R";
588 led->cdev_led1r.brightness = LED_OFF;
589 led->cdev_led1r.brightness_set = bd2802_set_led1r_brightness;
590 led->cdev_led1r.blink_set = bd2802_set_led1r_blink;
591
592 ret = led_classdev_register(&led->client->dev, &led->cdev_led1r);
593 if (ret < 0) {
594 dev_err(&led->client->dev, "couldn't register LED %s\n",
595 led->cdev_led1r.name);
596 goto failed_unregister_led1_R;
597 }
598
599 led->cdev_led1g.name = "led1_G";
600 led->cdev_led1g.brightness = LED_OFF;
601 led->cdev_led1g.brightness_set = bd2802_set_led1g_brightness;
602 led->cdev_led1g.blink_set = bd2802_set_led1g_blink;
603
604 ret = led_classdev_register(&led->client->dev, &led->cdev_led1g);
605 if (ret < 0) {
606 dev_err(&led->client->dev, "couldn't register LED %s\n",
607 led->cdev_led1g.name);
608 goto failed_unregister_led1_G;
609 }
610
611 led->cdev_led1b.name = "led1_B";
612 led->cdev_led1b.brightness = LED_OFF;
613 led->cdev_led1b.brightness_set = bd2802_set_led1b_brightness;
614 led->cdev_led1b.blink_set = bd2802_set_led1b_blink;
615
616 ret = led_classdev_register(&led->client->dev, &led->cdev_led1b);
617 if (ret < 0) {
618 dev_err(&led->client->dev, "couldn't register LED %s\n",
619 led->cdev_led1b.name);
620 goto failed_unregister_led1_B;
621 }
622
623 led->cdev_led2r.name = "led2_R";
624 led->cdev_led2r.brightness = LED_OFF;
625 led->cdev_led2r.brightness_set = bd2802_set_led2r_brightness;
626 led->cdev_led2r.blink_set = bd2802_set_led2r_blink;
627
628 ret = led_classdev_register(&led->client->dev, &led->cdev_led2r);
629 if (ret < 0) {
630 dev_err(&led->client->dev, "couldn't register LED %s\n",
631 led->cdev_led2r.name);
632 goto failed_unregister_led2_R;
633 }
634
635 led->cdev_led2g.name = "led2_G";
636 led->cdev_led2g.brightness = LED_OFF;
637 led->cdev_led2g.brightness_set = bd2802_set_led2g_brightness;
638 led->cdev_led2g.blink_set = bd2802_set_led2g_blink;
639
640 ret = led_classdev_register(&led->client->dev, &led->cdev_led2g);
641 if (ret < 0) {
642 dev_err(&led->client->dev, "couldn't register LED %s\n",
643 led->cdev_led2g.name);
644 goto failed_unregister_led2_G;
645 }
646
647 led->cdev_led2b.name = "led2_B";
648 led->cdev_led2b.brightness = LED_OFF;
649 led->cdev_led2b.brightness_set = bd2802_set_led2b_brightness;
650 led->cdev_led2b.blink_set = bd2802_set_led2b_blink;
651 led->cdev_led2b.flags |= LED_CORE_SUSPENDRESUME;
652
653 ret = led_classdev_register(&led->client->dev, &led->cdev_led2b);
654 if (ret < 0) {
655 dev_err(&led->client->dev, "couldn't register LED %s\n",
656 led->cdev_led2b.name);
657 goto failed_unregister_led2_B;
658 }
659
660 return 0;
661
662 failed_unregister_led2_B:
663 led_classdev_unregister(&led->cdev_led2g);
664 failed_unregister_led2_G:
665 led_classdev_unregister(&led->cdev_led2r);
666 failed_unregister_led2_R:
667 led_classdev_unregister(&led->cdev_led1b);
668 failed_unregister_led1_B:
669 led_classdev_unregister(&led->cdev_led1g);
670 failed_unregister_led1_G:
671 led_classdev_unregister(&led->cdev_led1r);
672 failed_unregister_led1_R:
673
674 return ret;
675 }
676
677 static void bd2802_unregister_led_classdev(struct bd2802_led *led)
678 {
679 cancel_work_sync(&led->work);
680 led_classdev_unregister(&led->cdev_led1r);
681 }
682
683 static int __devinit bd2802_probe(struct i2c_client *client,
684 const struct i2c_device_id *id)
685 {
686 struct bd2802_led *led;
687 struct bd2802_led_platform_data *pdata;
688 int ret, i;
689
690 led = kzalloc(sizeof(struct bd2802_led), GFP_KERNEL);
691 if (!led) {
692 dev_err(&client->dev, "failed to allocate driver data\n");
693 return -ENOMEM;
694 }
695
696 led->client = client;
697 pdata = led->pdata = client->dev.platform_data;
698 i2c_set_clientdata(client, led);
699
700 /* Configure RESET GPIO (L: RESET, H: RESET cancel) */
701 gpio_request(pdata->reset_gpio, "RGB_RESETB");
702 gpio_direction_output(pdata->reset_gpio, 1);
703
704 /* Tacss = min 0.1ms */
705 udelay(100);
706
707 /* Detect BD2802GU */
708 ret = bd2802_write_byte(client, BD2802_REG_CLKSETUP, 0x00);
709 if (ret < 0) {
710 dev_err(&client->dev, "failed to detect device\n");
711 goto failed_free;
712 } else
713 dev_info(&client->dev, "return 0x%02x\n", ret);
714
715 /* To save the power, reset BD2802 after detecting */
716 gpio_set_value(led->pdata->reset_gpio, 0);
717
718 /* Default attributes */
719 led->wave_pattern = BD2802_PATTERN_HALF;
720 led->rgb_current = BD2802_CURRENT_032;
721
722 init_rwsem(&led->rwsem);
723
724 for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) {
725 ret = device_create_file(&led->client->dev,
726 bd2802_attributes[i]);
727 if (ret) {
728 dev_err(&led->client->dev, "failed: sysfs file %s\n",
729 bd2802_attributes[i]->attr.name);
730 goto failed_unregister_dev_file;
731 }
732 }
733
734 ret = bd2802_register_led_classdev(led);
735 if (ret < 0)
736 goto failed_unregister_dev_file;
737
738 return 0;
739
740 failed_unregister_dev_file:
741 for (i--; i >= 0; i--)
742 device_remove_file(&led->client->dev, bd2802_attributes[i]);
743 failed_free:
744 i2c_set_clientdata(client, NULL);
745 kfree(led);
746
747 return ret;
748 }
749
750 static int __exit bd2802_remove(struct i2c_client *client)
751 {
752 struct bd2802_led *led = i2c_get_clientdata(client);
753 int i;
754
755 gpio_set_value(led->pdata->reset_gpio, 0);
756 bd2802_unregister_led_classdev(led);
757 if (led->adf_on)
758 bd2802_disable_adv_conf(led);
759 for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++)
760 device_remove_file(&led->client->dev, bd2802_attributes[i]);
761 i2c_set_clientdata(client, NULL);
762 kfree(led);
763
764 return 0;
765 }
766
767 static int bd2802_suspend(struct i2c_client *client, pm_message_t mesg)
768 {
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 i2c_client *client)
777 {
778 struct bd2802_led *led = i2c_get_clientdata(client);
779
780 if (!bd2802_is_all_off(led) || led->adf_on) {
781 bd2802_reset_cancel(led);
782 bd2802_restore_state(led);
783 }
784
785 return 0;
786 }
787
788 static const struct i2c_device_id bd2802_id[] = {
789 { "BD2802", 0 },
790 { }
791 };
792 MODULE_DEVICE_TABLE(i2c, bd2802_id);
793
794 static struct i2c_driver bd2802_i2c_driver = {
795 .driver = {
796 .name = "BD2802",
797 },
798 .probe = bd2802_probe,
799 .remove = __exit_p(bd2802_remove),
800 .suspend = bd2802_suspend,
801 .resume = bd2802_resume,
802 .id_table = bd2802_id,
803 };
804
805 static int __init bd2802_init(void)
806 {
807 return i2c_add_driver(&bd2802_i2c_driver);
808 }
809 module_init(bd2802_init);
810
811 static void __exit bd2802_exit(void)
812 {
813 i2c_del_driver(&bd2802_i2c_driver);
814 }
815 module_exit(bd2802_exit);
816
817 MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>");
818 MODULE_DESCRIPTION("BD2802 LED driver");
819 MODULE_LICENSE("GPL v2");
Support for the Chinese Samsung S3C2440 based development boards