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bonding: fix return value of couple of store functions
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / leds / leds-bd2802.c
blob19dc4b61a1055220b0308434c30f7028bdcfb2df
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
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 static void bd2802_restore_state(struct bd2802_led *led)
323 {
324 int i;
325
326 for (i = 0; i < LED_NUM; i++) {
327 if (led->led[i].r)
328 bd2802_turn_on(led, i, RED, led->led[i].r);
329 if (led->led[i].g)
330 bd2802_turn_on(led, i, GREEN, led->led[i].g);
331 if (led->led[i].b)
332 bd2802_turn_on(led, i, BLUE, led->led[i].b);
333 }
334 }
335
336 #define BD2802_SET_REGISTER(reg_addr, reg_name) \
337 static ssize_t bd2802_store_reg##reg_addr(struct device *dev, \
338 struct device_attribute *attr, const char *buf, size_t count) \
339 { \
340 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
341 unsigned long val; \
342 int ret; \
343 if (!count) \
344 return -EINVAL; \
345 ret = strict_strtoul(buf, 16, &val); \
346 if (ret) \
347 return ret; \
348 down_write(&led->rwsem); \
349 bd2802_write_byte(led->client, reg_addr, (u8) val); \
350 up_write(&led->rwsem); \
351 return count; \
352 } \
353 static struct device_attribute bd2802_reg##reg_addr##_attr = { \
354 .attr = {.name = reg_name, .mode = 0644}, \
355 .store = bd2802_store_reg##reg_addr, \
356 };
357
358 BD2802_SET_REGISTER(0x00, "0x00");
359 BD2802_SET_REGISTER(0x01, "0x01");
360 BD2802_SET_REGISTER(0x02, "0x02");
361 BD2802_SET_REGISTER(0x03, "0x03");
362 BD2802_SET_REGISTER(0x04, "0x04");
363 BD2802_SET_REGISTER(0x05, "0x05");
364 BD2802_SET_REGISTER(0x06, "0x06");
365 BD2802_SET_REGISTER(0x07, "0x07");
366 BD2802_SET_REGISTER(0x08, "0x08");
367 BD2802_SET_REGISTER(0x09, "0x09");
368 BD2802_SET_REGISTER(0x0a, "0x0a");
369 BD2802_SET_REGISTER(0x0b, "0x0b");
370 BD2802_SET_REGISTER(0x0c, "0x0c");
371 BD2802_SET_REGISTER(0x0d, "0x0d");
372 BD2802_SET_REGISTER(0x0e, "0x0e");
373 BD2802_SET_REGISTER(0x0f, "0x0f");
374 BD2802_SET_REGISTER(0x10, "0x10");
375 BD2802_SET_REGISTER(0x11, "0x11");
376 BD2802_SET_REGISTER(0x12, "0x12");
377 BD2802_SET_REGISTER(0x13, "0x13");
378 BD2802_SET_REGISTER(0x14, "0x14");
379 BD2802_SET_REGISTER(0x15, "0x15");
380
381 static struct device_attribute *bd2802_addr_attributes[] = {
382 &bd2802_reg0x00_attr,
383 &bd2802_reg0x01_attr,
384 &bd2802_reg0x02_attr,
385 &bd2802_reg0x03_attr,
386 &bd2802_reg0x04_attr,
387 &bd2802_reg0x05_attr,
388 &bd2802_reg0x06_attr,
389 &bd2802_reg0x07_attr,
390 &bd2802_reg0x08_attr,
391 &bd2802_reg0x09_attr,
392 &bd2802_reg0x0a_attr,
393 &bd2802_reg0x0b_attr,
394 &bd2802_reg0x0c_attr,
395 &bd2802_reg0x0d_attr,
396 &bd2802_reg0x0e_attr,
397 &bd2802_reg0x0f_attr,
398 &bd2802_reg0x10_attr,
399 &bd2802_reg0x11_attr,
400 &bd2802_reg0x12_attr,
401 &bd2802_reg0x13_attr,
402 &bd2802_reg0x14_attr,
403 &bd2802_reg0x15_attr,
404 };
405
406 static void bd2802_enable_adv_conf(struct bd2802_led *led)
407 {
408 int i, ret;
409
410 for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++) {
411 ret = device_create_file(&led->client->dev,
412 bd2802_addr_attributes[i]);
413 if (ret) {
414 dev_err(&led->client->dev, "failed: sysfs file %s\n",
415 bd2802_addr_attributes[i]->attr.name);
416 goto failed_remove_files;
417 }
418 }
419
420 if (bd2802_is_all_off(led))
421 bd2802_reset_cancel(led);
422
423 led->adf_on = 1;
424
425 return;
426
427 failed_remove_files:
428 for (i--; i >= 0; i--)
429 device_remove_file(&led->client->dev,
430 bd2802_addr_attributes[i]);
431 }
432
433 static void bd2802_disable_adv_conf(struct bd2802_led *led)
434 {
435 int i;
436
437 for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++)
438 device_remove_file(&led->client->dev,
439 bd2802_addr_attributes[i]);
440
441 if (bd2802_is_all_off(led))
442 gpio_set_value(led->pdata->reset_gpio, 0);
443
444 led->adf_on = 0;
445 }
446
447 static ssize_t bd2802_show_adv_conf(struct device *dev,
448 struct device_attribute *attr, char *buf)
449 {
450 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
451 ssize_t ret;
452
453 down_read(&led->rwsem);
454 if (led->adf_on)
455 ret = sprintf(buf, "on\n");
456 else
457 ret = sprintf(buf, "off\n");
458 up_read(&led->rwsem);
459
460 return ret;
461 }
462
463 static ssize_t bd2802_store_adv_conf(struct device *dev,
464 struct device_attribute *attr, const char *buf, size_t count)
465 {
466 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
467
468 if (!count)
469 return -EINVAL;
470
471 down_write(&led->rwsem);
472 if (!led->adf_on && !strncmp(buf, "on", 2))
473 bd2802_enable_adv_conf(led);
474 else if (led->adf_on && !strncmp(buf, "off", 3))
475 bd2802_disable_adv_conf(led);
476 up_write(&led->rwsem);
477
478 return count;
479 }
480
481 static struct device_attribute bd2802_adv_conf_attr = {
482 .attr = {
483 .name = "advanced_configuration",
484 .mode = 0644,
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 }, \
522 .show = bd2802_show_##attr_name, \
523 .store = bd2802_store_##attr_name, \
524 };
525
526 BD2802_CONTROL_ATTR(wave_pattern, "wave_pattern");
527 BD2802_CONTROL_ATTR(rgb_current, "rgb_current");
528
529 static struct device_attribute *bd2802_attributes[] = {
530 &bd2802_adv_conf_attr,
531 &bd2802_wave_pattern_attr,
532 &bd2802_rgb_current_attr,
533 };
534
535 static void bd2802_led_work(struct work_struct *work)
536 {
537 struct bd2802_led *led = container_of(work, struct bd2802_led, work);
538
539 if (led->state)
540 bd2802_turn_on(led, led->led_id, led->color, led->state);
541 else
542 bd2802_turn_off(led, led->led_id, led->color);
543 }
544
545 #define BD2802_CONTROL_RGBS(name, id, clr) \
546 static void bd2802_set_##name##_brightness(struct led_classdev *led_cdev,\
547 enum led_brightness value) \
548 { \
549 struct bd2802_led *led = \
550 container_of(led_cdev, struct bd2802_led, cdev_##name); \
551 led->led_id = id; \
552 led->color = clr; \
553 if (value == LED_OFF) \
554 led->state = BD2802_OFF; \
555 else \
556 led->state = BD2802_ON; \
557 schedule_work(&led->work); \
558 } \
559 static int bd2802_set_##name##_blink(struct led_classdev *led_cdev, \
560 unsigned long *delay_on, unsigned long *delay_off) \
561 { \
562 struct bd2802_led *led = \
563 container_of(led_cdev, struct bd2802_led, cdev_##name); \
564 if (*delay_on == 0 || *delay_off == 0) \
565 return -EINVAL; \
566 led->led_id = id; \
567 led->color = clr; \
568 led->state = BD2802_BLINK; \
569 schedule_work(&led->work); \
570 return 0; \
571 }
572
573 BD2802_CONTROL_RGBS(led1r, LED1, RED);
574 BD2802_CONTROL_RGBS(led1g, LED1, GREEN);
575 BD2802_CONTROL_RGBS(led1b, LED1, BLUE);
576 BD2802_CONTROL_RGBS(led2r, LED2, RED);
577 BD2802_CONTROL_RGBS(led2g, LED2, GREEN);
578 BD2802_CONTROL_RGBS(led2b, LED2, BLUE);
579
580 static int bd2802_register_led_classdev(struct bd2802_led *led)
581 {
582 int ret;
583
584 INIT_WORK(&led->work, bd2802_led_work);
585
586 led->cdev_led1r.name = "led1_R";
587 led->cdev_led1r.brightness = LED_OFF;
588 led->cdev_led1r.brightness_set = bd2802_set_led1r_brightness;
589 led->cdev_led1r.blink_set = bd2802_set_led1r_blink;
590
591 ret = led_classdev_register(&led->client->dev, &led->cdev_led1r);
592 if (ret < 0) {
593 dev_err(&led->client->dev, "couldn't register LED %s\n",
594 led->cdev_led1r.name);
595 goto failed_unregister_led1_R;
596 }
597
598 led->cdev_led1g.name = "led1_G";
599 led->cdev_led1g.brightness = LED_OFF;
600 led->cdev_led1g.brightness_set = bd2802_set_led1g_brightness;
601 led->cdev_led1g.blink_set = bd2802_set_led1g_blink;
602
603 ret = led_classdev_register(&led->client->dev, &led->cdev_led1g);
604 if (ret < 0) {
605 dev_err(&led->client->dev, "couldn't register LED %s\n",
606 led->cdev_led1g.name);
607 goto failed_unregister_led1_G;
608 }
609
610 led->cdev_led1b.name = "led1_B";
611 led->cdev_led1b.brightness = LED_OFF;
612 led->cdev_led1b.brightness_set = bd2802_set_led1b_brightness;
613 led->cdev_led1b.blink_set = bd2802_set_led1b_blink;
614
615 ret = led_classdev_register(&led->client->dev, &led->cdev_led1b);
616 if (ret < 0) {
617 dev_err(&led->client->dev, "couldn't register LED %s\n",
618 led->cdev_led1b.name);
619 goto failed_unregister_led1_B;
620 }
621
622 led->cdev_led2r.name = "led2_R";
623 led->cdev_led2r.brightness = LED_OFF;
624 led->cdev_led2r.brightness_set = bd2802_set_led2r_brightness;
625 led->cdev_led2r.blink_set = bd2802_set_led2r_blink;
626
627 ret = led_classdev_register(&led->client->dev, &led->cdev_led2r);
628 if (ret < 0) {
629 dev_err(&led->client->dev, "couldn't register LED %s\n",
630 led->cdev_led2r.name);
631 goto failed_unregister_led2_R;
632 }
633
634 led->cdev_led2g.name = "led2_G";
635 led->cdev_led2g.brightness = LED_OFF;
636 led->cdev_led2g.brightness_set = bd2802_set_led2g_brightness;
637 led->cdev_led2g.blink_set = bd2802_set_led2g_blink;
638
639 ret = led_classdev_register(&led->client->dev, &led->cdev_led2g);
640 if (ret < 0) {
641 dev_err(&led->client->dev, "couldn't register LED %s\n",
642 led->cdev_led2g.name);
643 goto failed_unregister_led2_G;
644 }
645
646 led->cdev_led2b.name = "led2_B";
647 led->cdev_led2b.brightness = LED_OFF;
648 led->cdev_led2b.brightness_set = bd2802_set_led2b_brightness;
649 led->cdev_led2b.blink_set = bd2802_set_led2b_blink;
650 led->cdev_led2b.flags |= LED_CORE_SUSPENDRESUME;
651
652 ret = led_classdev_register(&led->client->dev, &led->cdev_led2b);
653 if (ret < 0) {
654 dev_err(&led->client->dev, "couldn't register LED %s\n",
655 led->cdev_led2b.name);
656 goto failed_unregister_led2_B;
657 }
658
659 return 0;
660
661 failed_unregister_led2_B:
662 led_classdev_unregister(&led->cdev_led2g);
663 failed_unregister_led2_G:
664 led_classdev_unregister(&led->cdev_led2r);
665 failed_unregister_led2_R:
666 led_classdev_unregister(&led->cdev_led1b);
667 failed_unregister_led1_B:
668 led_classdev_unregister(&led->cdev_led1g);
669 failed_unregister_led1_G:
670 led_classdev_unregister(&led->cdev_led1r);
671 failed_unregister_led1_R:
672
673 return ret;
674 }
675
676 static void bd2802_unregister_led_classdev(struct bd2802_led *led)
677 {
678 cancel_work_sync(&led->work);
679 led_classdev_unregister(&led->cdev_led1r);
680 }
681
682 static int __devinit bd2802_probe(struct i2c_client *client,
683 const struct i2c_device_id *id)
684 {
685 struct bd2802_led *led;
686 struct bd2802_led_platform_data *pdata;
687 int ret, i;
688
689 led = kzalloc(sizeof(struct bd2802_led), GFP_KERNEL);
690 if (!led) {
691 dev_err(&client->dev, "failed to allocate driver data\n");
692 return -ENOMEM;
693 }
694
695 led->client = client;
696 pdata = led->pdata = client->dev.platform_data;
697 i2c_set_clientdata(client, led);
698
699 /* Configure RESET GPIO (L: RESET, H: RESET cancel) */
700 gpio_request(pdata->reset_gpio, "RGB_RESETB");
701 gpio_direction_output(pdata->reset_gpio, 1);
702
703 /* Tacss = min 0.1ms */
704 udelay(100);
705
706 /* Detect BD2802GU */
707 ret = bd2802_write_byte(client, BD2802_REG_CLKSETUP, 0x00);
708 if (ret < 0) {
709 dev_err(&client->dev, "failed to detect device\n");
710 goto failed_free;
711 } else
712 dev_info(&client->dev, "return 0x%02x\n", ret);
713
714 /* To save the power, reset BD2802 after detecting */
715 gpio_set_value(led->pdata->reset_gpio, 0);
716
717 /* Default attributes */
718 led->wave_pattern = BD2802_PATTERN_HALF;
719 led->rgb_current = BD2802_CURRENT_032;
720
721 init_rwsem(&led->rwsem);
722
723 for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) {
724 ret = device_create_file(&led->client->dev,
725 bd2802_attributes[i]);
726 if (ret) {
727 dev_err(&led->client->dev, "failed: sysfs file %s\n",
728 bd2802_attributes[i]->attr.name);
729 goto failed_unregister_dev_file;
730 }
731 }
732
733 ret = bd2802_register_led_classdev(led);
734 if (ret < 0)
735 goto failed_unregister_dev_file;
736
737 return 0;
738
739 failed_unregister_dev_file:
740 for (i--; i >= 0; i--)
741 device_remove_file(&led->client->dev, bd2802_attributes[i]);
742 failed_free:
743 kfree(led);
744
745 return ret;
746 }
747
748 static int __exit bd2802_remove(struct i2c_client *client)
749 {
750 struct bd2802_led *led = i2c_get_clientdata(client);
751 int i;
752
753 gpio_set_value(led->pdata->reset_gpio, 0);
754 bd2802_unregister_led_classdev(led);
755 if (led->adf_on)
756 bd2802_disable_adv_conf(led);
757 for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++)
758 device_remove_file(&led->client->dev, bd2802_attributes[i]);
759 kfree(led);
760
761 return 0;
762 }
763
764 static int bd2802_suspend(struct i2c_client *client, pm_message_t mesg)
765 {
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 i2c_client *client)
774 {
775 struct bd2802_led *led = i2c_get_clientdata(client);
776
777 if (!bd2802_is_all_off(led) || led->adf_on) {
778 bd2802_reset_cancel(led);
779 bd2802_restore_state(led);
780 }
781
782 return 0;
783 }
784
785 static const struct i2c_device_id bd2802_id[] = {
786 { "BD2802", 0 },
787 { }
788 };
789 MODULE_DEVICE_TABLE(i2c, bd2802_id);
790
791 static struct i2c_driver bd2802_i2c_driver = {
792 .driver = {
793 .name = "BD2802",
794 },
795 .probe = bd2802_probe,
796 .remove = __exit_p(bd2802_remove),
797 .suspend = bd2802_suspend,
798 .resume = bd2802_resume,
799 .id_table = bd2802_id,
800 };
801
802 static int __init bd2802_init(void)
803 {
804 return i2c_add_driver(&bd2802_i2c_driver);
805 }
806 module_init(bd2802_init);
807
808 static void __exit bd2802_exit(void)
809 {
810 i2c_del_driver(&bd2802_i2c_driver);
811 }
812 module_exit(bd2802_exit);
813
814 MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>");
815 MODULE_DESCRIPTION("BD2802 LED driver");
816 MODULE_LICENSE("GPL v2");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree