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[deliverable/linux.git] / drivers / leds / leds-lp5521.c
1 /*
2 * LP5521 LED chip driver.
3 *
4 * Copyright (C) 2010 Nokia Corporation
5 *
6 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25 #include <linux/i2c.h>
26 #include <linux/mutex.h>
27 #include <linux/gpio.h>
28 #include <linux/interrupt.h>
29 #include <linux/delay.h>
30 #include <linux/ctype.h>
31 #include <linux/spinlock.h>
32 #include <linux/wait.h>
33 #include <linux/leds.h>
34 #include <linux/leds-lp5521.h>
35 #include <linux/workqueue.h>
36 #include <linux/slab.h>
37
38 #define LP5521_PROGRAM_LENGTH 32 /* in bytes */
39
40 #define LP5521_MAX_LEDS 3 /* Maximum number of LEDs */
41 #define LP5521_MAX_ENGINES 3 /* Maximum number of engines */
42
43 #define LP5521_ENG_MASK_BASE 0x30 /* 00110000 */
44 #define LP5521_ENG_STATUS_MASK 0x07 /* 00000111 */
45
46 #define LP5521_CMD_LOAD 0x15 /* 00010101 */
47 #define LP5521_CMD_RUN 0x2a /* 00101010 */
48 #define LP5521_CMD_DIRECT 0x3f /* 00111111 */
49 #define LP5521_CMD_DISABLED 0x00 /* 00000000 */
50
51 /* Registers */
52 #define LP5521_REG_ENABLE 0x00
53 #define LP5521_REG_OP_MODE 0x01
54 #define LP5521_REG_R_PWM 0x02
55 #define LP5521_REG_G_PWM 0x03
56 #define LP5521_REG_B_PWM 0x04
57 #define LP5521_REG_R_CURRENT 0x05
58 #define LP5521_REG_G_CURRENT 0x06
59 #define LP5521_REG_B_CURRENT 0x07
60 #define LP5521_REG_CONFIG 0x08
61 #define LP5521_REG_R_CHANNEL_PC 0x09
62 #define LP5521_REG_G_CHANNEL_PC 0x0A
63 #define LP5521_REG_B_CHANNEL_PC 0x0B
64 #define LP5521_REG_STATUS 0x0C
65 #define LP5521_REG_RESET 0x0D
66 #define LP5521_REG_GPO 0x0E
67 #define LP5521_REG_R_PROG_MEM 0x10
68 #define LP5521_REG_G_PROG_MEM 0x30
69 #define LP5521_REG_B_PROG_MEM 0x50
70
71 #define LP5521_PROG_MEM_BASE LP5521_REG_R_PROG_MEM
72 #define LP5521_PROG_MEM_SIZE 0x20
73
74 /* Base register to set LED current */
75 #define LP5521_REG_LED_CURRENT_BASE LP5521_REG_R_CURRENT
76
77 /* Base register to set the brightness */
78 #define LP5521_REG_LED_PWM_BASE LP5521_REG_R_PWM
79
80 /* Bits in ENABLE register */
81 #define LP5521_MASTER_ENABLE 0x40 /* Chip master enable */
82 #define LP5521_LOGARITHMIC_PWM 0x80 /* Logarithmic PWM adjustment */
83 #define LP5521_EXEC_RUN 0x2A
84 #define LP5521_ENABLE_DEFAULT \
85 (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM)
86 #define LP5521_ENABLE_RUN_PROGRAM \
87 (LP5521_ENABLE_DEFAULT | LP5521_EXEC_RUN)
88
89 /* Status */
90 #define LP5521_EXT_CLK_USED 0x08
91
92 /* default R channel current register value */
93 #define LP5521_REG_R_CURR_DEFAULT 0xAF
94
95 /* Pattern Mode */
96 #define PATTERN_OFF 0
97
98 struct lp5521_engine {
99 int id;
100 u8 mode;
101 u8 prog_page;
102 u8 engine_mask;
103 };
104
105 struct lp5521_led {
106 int id;
107 u8 chan_nr;
108 u8 led_current;
109 u8 max_current;
110 struct led_classdev cdev;
111 struct work_struct brightness_work;
112 u8 brightness;
113 };
114
115 struct lp5521_chip {
116 struct lp5521_platform_data *pdata;
117 struct mutex lock; /* Serialize control */
118 struct i2c_client *client;
119 struct lp5521_engine engines[LP5521_MAX_ENGINES];
120 struct lp5521_led leds[LP5521_MAX_LEDS];
121 u8 num_channels;
122 u8 num_leds;
123 };
124
125 static inline struct lp5521_led *cdev_to_led(struct led_classdev *cdev)
126 {
127 return container_of(cdev, struct lp5521_led, cdev);
128 }
129
130 static inline struct lp5521_chip *engine_to_lp5521(struct lp5521_engine *engine)
131 {
132 return container_of(engine, struct lp5521_chip,
133 engines[engine->id - 1]);
134 }
135
136 static inline struct lp5521_chip *led_to_lp5521(struct lp5521_led *led)
137 {
138 return container_of(led, struct lp5521_chip,
139 leds[led->id]);
140 }
141
142 static void lp5521_led_brightness_work(struct work_struct *work);
143
144 static inline int lp5521_write(struct i2c_client *client, u8 reg, u8 value)
145 {
146 return i2c_smbus_write_byte_data(client, reg, value);
147 }
148
149 static int lp5521_read(struct i2c_client *client, u8 reg, u8 *buf)
150 {
151 s32 ret;
152
153 ret = i2c_smbus_read_byte_data(client, reg);
154 if (ret < 0)
155 return -EIO;
156
157 *buf = ret;
158 return 0;
159 }
160
161 static int lp5521_set_engine_mode(struct lp5521_engine *engine, u8 mode)
162 {
163 struct lp5521_chip *chip = engine_to_lp5521(engine);
164 struct i2c_client *client = chip->client;
165 int ret;
166 u8 engine_state;
167
168 /* Only transition between RUN and DIRECT mode are handled here */
169 if (mode == LP5521_CMD_LOAD)
170 return 0;
171
172 if (mode == LP5521_CMD_DISABLED)
173 mode = LP5521_CMD_DIRECT;
174
175 ret = lp5521_read(client, LP5521_REG_OP_MODE, &engine_state);
176 if (ret < 0)
177 return ret;
178
179 /* set mode only for this engine */
180 engine_state &= ~(engine->engine_mask);
181 mode &= engine->engine_mask;
182 engine_state |= mode;
183 return lp5521_write(client, LP5521_REG_OP_MODE, engine_state);
184 }
185
186 static int lp5521_load_program(struct lp5521_engine *eng, const u8 *pattern)
187 {
188 struct lp5521_chip *chip = engine_to_lp5521(eng);
189 struct i2c_client *client = chip->client;
190 int ret;
191 int addr;
192 u8 mode;
193
194 /* move current engine to direct mode and remember the state */
195 ret = lp5521_set_engine_mode(eng, LP5521_CMD_DIRECT);
196 /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
197 usleep_range(1000, 2000);
198 ret |= lp5521_read(client, LP5521_REG_OP_MODE, &mode);
199
200 /* For loading, all the engines to load mode */
201 lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
202 /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
203 usleep_range(1000, 2000);
204 lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_LOAD);
205 /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
206 usleep_range(1000, 2000);
207
208 addr = LP5521_PROG_MEM_BASE + eng->prog_page * LP5521_PROG_MEM_SIZE;
209 i2c_smbus_write_i2c_block_data(client,
210 addr,
211 LP5521_PROG_MEM_SIZE,
212 pattern);
213
214 ret |= lp5521_write(client, LP5521_REG_OP_MODE, mode);
215 return ret;
216 }
217
218 static int lp5521_set_led_current(struct lp5521_chip *chip, int led, u8 curr)
219 {
220 return lp5521_write(chip->client,
221 LP5521_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
222 curr);
223 }
224
225 static void lp5521_init_engine(struct lp5521_chip *chip)
226 {
227 int i;
228 for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
229 chip->engines[i].id = i + 1;
230 chip->engines[i].engine_mask = LP5521_ENG_MASK_BASE >> (i * 2);
231 chip->engines[i].prog_page = i;
232 }
233 }
234
235 static int lp5521_configure(struct i2c_client *client)
236 {
237 struct lp5521_chip *chip = i2c_get_clientdata(client);
238 int ret;
239 u8 cfg;
240
241 lp5521_init_engine(chip);
242
243 /* Set all PWMs to direct control mode */
244 ret = lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
245
246 cfg = chip->pdata->update_config ?
247 : (LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO | LP5521_R_TO_BATT);
248 ret |= lp5521_write(client, LP5521_REG_CONFIG, cfg);
249
250 /* Initialize all channels PWM to zero -> leds off */
251 ret |= lp5521_write(client, LP5521_REG_R_PWM, 0);
252 ret |= lp5521_write(client, LP5521_REG_G_PWM, 0);
253 ret |= lp5521_write(client, LP5521_REG_B_PWM, 0);
254
255 /* Set engines are set to run state when OP_MODE enables engines */
256 ret |= lp5521_write(client, LP5521_REG_ENABLE,
257 LP5521_ENABLE_RUN_PROGRAM);
258 /* enable takes 500us. 1 - 2 ms leaves some margin */
259 usleep_range(1000, 2000);
260
261 return ret;
262 }
263
264 static int lp5521_run_selftest(struct lp5521_chip *chip, char *buf)
265 {
266 int ret;
267 u8 status;
268
269 ret = lp5521_read(chip->client, LP5521_REG_STATUS, &status);
270 if (ret < 0)
271 return ret;
272
273 /* Check that ext clock is really in use if requested */
274 if (chip->pdata && chip->pdata->clock_mode == LP5521_CLOCK_EXT)
275 if ((status & LP5521_EXT_CLK_USED) == 0)
276 return -EIO;
277 return 0;
278 }
279
280 static void lp5521_set_brightness(struct led_classdev *cdev,
281 enum led_brightness brightness)
282 {
283 struct lp5521_led *led = cdev_to_led(cdev);
284 led->brightness = (u8)brightness;
285 schedule_work(&led->brightness_work);
286 }
287
288 static void lp5521_led_brightness_work(struct work_struct *work)
289 {
290 struct lp5521_led *led = container_of(work,
291 struct lp5521_led,
292 brightness_work);
293 struct lp5521_chip *chip = led_to_lp5521(led);
294 struct i2c_client *client = chip->client;
295
296 mutex_lock(&chip->lock);
297 lp5521_write(client, LP5521_REG_LED_PWM_BASE + led->chan_nr,
298 led->brightness);
299 mutex_unlock(&chip->lock);
300 }
301
302 /* Detect the chip by setting its ENABLE register and reading it back. */
303 static int lp5521_detect(struct i2c_client *client)
304 {
305 int ret;
306 u8 buf;
307
308 ret = lp5521_write(client, LP5521_REG_ENABLE, LP5521_ENABLE_DEFAULT);
309 if (ret)
310 return ret;
311 /* enable takes 500us. 1 - 2 ms leaves some margin */
312 usleep_range(1000, 2000);
313 ret = lp5521_read(client, LP5521_REG_ENABLE, &buf);
314 if (ret)
315 return ret;
316 if (buf != LP5521_ENABLE_DEFAULT)
317 return -ENODEV;
318
319 return 0;
320 }
321
322 /* Set engine mode and create appropriate sysfs attributes, if required. */
323 static int lp5521_set_mode(struct lp5521_engine *engine, u8 mode)
324 {
325 int ret = 0;
326
327 /* if in that mode already do nothing, except for run */
328 if (mode == engine->mode && mode != LP5521_CMD_RUN)
329 return 0;
330
331 if (mode == LP5521_CMD_RUN) {
332 ret = lp5521_set_engine_mode(engine, LP5521_CMD_RUN);
333 } else if (mode == LP5521_CMD_LOAD) {
334 lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED);
335 lp5521_set_engine_mode(engine, LP5521_CMD_LOAD);
336 } else if (mode == LP5521_CMD_DISABLED) {
337 lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED);
338 }
339
340 engine->mode = mode;
341
342 return ret;
343 }
344
345 static int lp5521_do_store_load(struct lp5521_engine *engine,
346 const char *buf, size_t len)
347 {
348 struct lp5521_chip *chip = engine_to_lp5521(engine);
349 struct i2c_client *client = chip->client;
350 int ret, nrchars, offset = 0, i = 0;
351 char c[3];
352 unsigned cmd;
353 u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
354
355 while ((offset < len - 1) && (i < LP5521_PROGRAM_LENGTH)) {
356 /* separate sscanfs because length is working only for %s */
357 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
358 if (ret != 2)
359 goto fail;
360 ret = sscanf(c, "%2x", &cmd);
361 if (ret != 1)
362 goto fail;
363 pattern[i] = (u8)cmd;
364
365 offset += nrchars;
366 i++;
367 }
368
369 /* Each instruction is 16bit long. Check that length is even */
370 if (i % 2)
371 goto fail;
372
373 mutex_lock(&chip->lock);
374 if (engine->mode == LP5521_CMD_LOAD)
375 ret = lp5521_load_program(engine, pattern);
376 else
377 ret = -EINVAL;
378 mutex_unlock(&chip->lock);
379
380 if (ret) {
381 dev_err(&client->dev, "failed loading pattern\n");
382 return ret;
383 }
384
385 return len;
386 fail:
387 dev_err(&client->dev, "wrong pattern format\n");
388 return -EINVAL;
389 }
390
391 static ssize_t store_engine_load(struct device *dev,
392 struct device_attribute *attr,
393 const char *buf, size_t len, int nr)
394 {
395 struct i2c_client *client = to_i2c_client(dev);
396 struct lp5521_chip *chip = i2c_get_clientdata(client);
397 return lp5521_do_store_load(&chip->engines[nr - 1], buf, len);
398 }
399
400 #define store_load(nr) \
401 static ssize_t store_engine##nr##_load(struct device *dev, \
402 struct device_attribute *attr, \
403 const char *buf, size_t len) \
404 { \
405 return store_engine_load(dev, attr, buf, len, nr); \
406 }
407 store_load(1)
408 store_load(2)
409 store_load(3)
410
411 static ssize_t show_engine_mode(struct device *dev,
412 struct device_attribute *attr,
413 char *buf, int nr)
414 {
415 struct i2c_client *client = to_i2c_client(dev);
416 struct lp5521_chip *chip = i2c_get_clientdata(client);
417 switch (chip->engines[nr - 1].mode) {
418 case LP5521_CMD_RUN:
419 return sprintf(buf, "run\n");
420 case LP5521_CMD_LOAD:
421 return sprintf(buf, "load\n");
422 case LP5521_CMD_DISABLED:
423 return sprintf(buf, "disabled\n");
424 default:
425 return sprintf(buf, "disabled\n");
426 }
427 }
428
429 #define show_mode(nr) \
430 static ssize_t show_engine##nr##_mode(struct device *dev, \
431 struct device_attribute *attr, \
432 char *buf) \
433 { \
434 return show_engine_mode(dev, attr, buf, nr); \
435 }
436 show_mode(1)
437 show_mode(2)
438 show_mode(3)
439
440 static ssize_t store_engine_mode(struct device *dev,
441 struct device_attribute *attr,
442 const char *buf, size_t len, int nr)
443 {
444 struct i2c_client *client = to_i2c_client(dev);
445 struct lp5521_chip *chip = i2c_get_clientdata(client);
446 struct lp5521_engine *engine = &chip->engines[nr - 1];
447 mutex_lock(&chip->lock);
448
449 if (!strncmp(buf, "run", 3))
450 lp5521_set_mode(engine, LP5521_CMD_RUN);
451 else if (!strncmp(buf, "load", 4))
452 lp5521_set_mode(engine, LP5521_CMD_LOAD);
453 else if (!strncmp(buf, "disabled", 8))
454 lp5521_set_mode(engine, LP5521_CMD_DISABLED);
455
456 mutex_unlock(&chip->lock);
457 return len;
458 }
459
460 #define store_mode(nr) \
461 static ssize_t store_engine##nr##_mode(struct device *dev, \
462 struct device_attribute *attr, \
463 const char *buf, size_t len) \
464 { \
465 return store_engine_mode(dev, attr, buf, len, nr); \
466 }
467 store_mode(1)
468 store_mode(2)
469 store_mode(3)
470
471 static ssize_t show_max_current(struct device *dev,
472 struct device_attribute *attr,
473 char *buf)
474 {
475 struct led_classdev *led_cdev = dev_get_drvdata(dev);
476 struct lp5521_led *led = cdev_to_led(led_cdev);
477
478 return sprintf(buf, "%d\n", led->max_current);
479 }
480
481 static ssize_t show_current(struct device *dev,
482 struct device_attribute *attr,
483 char *buf)
484 {
485 struct led_classdev *led_cdev = dev_get_drvdata(dev);
486 struct lp5521_led *led = cdev_to_led(led_cdev);
487
488 return sprintf(buf, "%d\n", led->led_current);
489 }
490
491 static ssize_t store_current(struct device *dev,
492 struct device_attribute *attr,
493 const char *buf, size_t len)
494 {
495 struct led_classdev *led_cdev = dev_get_drvdata(dev);
496 struct lp5521_led *led = cdev_to_led(led_cdev);
497 struct lp5521_chip *chip = led_to_lp5521(led);
498 ssize_t ret;
499 unsigned long curr;
500
501 if (kstrtoul(buf, 0, &curr))
502 return -EINVAL;
503
504 if (curr > led->max_current)
505 return -EINVAL;
506
507 mutex_lock(&chip->lock);
508 ret = lp5521_set_led_current(chip, led->id, curr);
509 mutex_unlock(&chip->lock);
510
511 if (ret < 0)
512 return ret;
513
514 led->led_current = (u8)curr;
515
516 return len;
517 }
518
519 static ssize_t lp5521_selftest(struct device *dev,
520 struct device_attribute *attr,
521 char *buf)
522 {
523 struct i2c_client *client = to_i2c_client(dev);
524 struct lp5521_chip *chip = i2c_get_clientdata(client);
525 int ret;
526
527 mutex_lock(&chip->lock);
528 ret = lp5521_run_selftest(chip, buf);
529 mutex_unlock(&chip->lock);
530 return sprintf(buf, "%s\n", ret ? "FAIL" : "OK");
531 }
532
533 static void lp5521_clear_program_memory(struct i2c_client *cl)
534 {
535 int i;
536 u8 rgb_mem[] = {
537 LP5521_REG_R_PROG_MEM,
538 LP5521_REG_G_PROG_MEM,
539 LP5521_REG_B_PROG_MEM,
540 };
541
542 for (i = 0; i < ARRAY_SIZE(rgb_mem); i++) {
543 lp5521_write(cl, rgb_mem[i], 0);
544 lp5521_write(cl, rgb_mem[i] + 1, 0);
545 }
546 }
547
548 static void lp5521_write_program_memory(struct i2c_client *cl,
549 u8 base, u8 *rgb, int size)
550 {
551 int i;
552
553 if (!rgb || size <= 0)
554 return;
555
556 for (i = 0; i < size; i++)
557 lp5521_write(cl, base + i, *(rgb + i));
558
559 lp5521_write(cl, base + i, 0);
560 lp5521_write(cl, base + i + 1, 0);
561 }
562
563 static inline struct lp5521_led_pattern *lp5521_get_pattern
564 (struct lp5521_chip *chip, u8 offset)
565 {
566 struct lp5521_led_pattern *ptn;
567 ptn = chip->pdata->patterns + (offset - 1);
568 return ptn;
569 }
570
571 static void lp5521_run_led_pattern(int mode, struct lp5521_chip *chip)
572 {
573 struct lp5521_led_pattern *ptn;
574 struct i2c_client *cl = chip->client;
575 int num_patterns = chip->pdata->num_patterns;
576
577 if (mode > num_patterns || !(chip->pdata->patterns))
578 return;
579
580 if (mode == PATTERN_OFF) {
581 lp5521_write(cl, LP5521_REG_ENABLE, LP5521_ENABLE_DEFAULT);
582 usleep_range(1000, 2000);
583 lp5521_write(cl, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
584 } else {
585 ptn = lp5521_get_pattern(chip, mode);
586 if (!ptn)
587 return;
588
589 lp5521_write(cl, LP5521_REG_OP_MODE, LP5521_CMD_LOAD);
590 usleep_range(1000, 2000);
591
592 lp5521_clear_program_memory(cl);
593
594 lp5521_write_program_memory(cl, LP5521_REG_R_PROG_MEM,
595 ptn->r, ptn->size_r);
596 lp5521_write_program_memory(cl, LP5521_REG_G_PROG_MEM,
597 ptn->g, ptn->size_g);
598 lp5521_write_program_memory(cl, LP5521_REG_B_PROG_MEM,
599 ptn->b, ptn->size_b);
600
601 lp5521_write(cl, LP5521_REG_OP_MODE, LP5521_CMD_RUN);
602 usleep_range(1000, 2000);
603 lp5521_write(cl, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM);
604 }
605 }
606
607 static ssize_t store_led_pattern(struct device *dev,
608 struct device_attribute *attr,
609 const char *buf, size_t len)
610 {
611 struct lp5521_chip *chip = i2c_get_clientdata(to_i2c_client(dev));
612 unsigned long val;
613 int ret;
614
615 ret = strict_strtoul(buf, 16, &val);
616 if (ret)
617 return ret;
618
619 lp5521_run_led_pattern(val, chip);
620
621 return len;
622 }
623
624 /* led class device attributes */
625 static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current);
626 static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
627
628 static struct attribute *lp5521_led_attributes[] = {
629 &dev_attr_led_current.attr,
630 &dev_attr_max_current.attr,
631 NULL,
632 };
633
634 static struct attribute_group lp5521_led_attribute_group = {
635 .attrs = lp5521_led_attributes
636 };
637
638 /* device attributes */
639 static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR,
640 show_engine1_mode, store_engine1_mode);
641 static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR,
642 show_engine2_mode, store_engine2_mode);
643 static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR,
644 show_engine3_mode, store_engine3_mode);
645 static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load);
646 static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load);
647 static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load);
648 static DEVICE_ATTR(selftest, S_IRUGO, lp5521_selftest, NULL);
649 static DEVICE_ATTR(led_pattern, S_IWUSR, NULL, store_led_pattern);
650
651 static struct attribute *lp5521_attributes[] = {
652 &dev_attr_engine1_mode.attr,
653 &dev_attr_engine2_mode.attr,
654 &dev_attr_engine3_mode.attr,
655 &dev_attr_selftest.attr,
656 &dev_attr_engine1_load.attr,
657 &dev_attr_engine2_load.attr,
658 &dev_attr_engine3_load.attr,
659 &dev_attr_led_pattern.attr,
660 NULL
661 };
662
663 static const struct attribute_group lp5521_group = {
664 .attrs = lp5521_attributes,
665 };
666
667 static int lp5521_register_sysfs(struct i2c_client *client)
668 {
669 struct device *dev = &client->dev;
670 return sysfs_create_group(&dev->kobj, &lp5521_group);
671 }
672
673 static void lp5521_unregister_sysfs(struct i2c_client *client)
674 {
675 struct lp5521_chip *chip = i2c_get_clientdata(client);
676 struct device *dev = &client->dev;
677 int i;
678
679 sysfs_remove_group(&dev->kobj, &lp5521_group);
680
681 for (i = 0; i < chip->num_leds; i++)
682 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
683 &lp5521_led_attribute_group);
684 }
685
686 static int __devinit lp5521_init_led(struct lp5521_led *led,
687 struct i2c_client *client,
688 int chan, struct lp5521_platform_data *pdata)
689 {
690 struct device *dev = &client->dev;
691 char name[32];
692 int res;
693
694 if (chan >= LP5521_MAX_LEDS)
695 return -EINVAL;
696
697 if (pdata->led_config[chan].led_current == 0)
698 return 0;
699
700 led->led_current = pdata->led_config[chan].led_current;
701 led->max_current = pdata->led_config[chan].max_current;
702 led->chan_nr = pdata->led_config[chan].chan_nr;
703
704 if (led->chan_nr >= LP5521_MAX_LEDS) {
705 dev_err(dev, "Use channel numbers between 0 and %d\n",
706 LP5521_MAX_LEDS - 1);
707 return -EINVAL;
708 }
709
710 led->cdev.brightness_set = lp5521_set_brightness;
711 if (pdata->led_config[chan].name) {
712 led->cdev.name = pdata->led_config[chan].name;
713 } else {
714 snprintf(name, sizeof(name), "%s:channel%d",
715 pdata->label ?: client->name, chan);
716 led->cdev.name = name;
717 }
718
719 res = led_classdev_register(dev, &led->cdev);
720 if (res < 0) {
721 dev_err(dev, "couldn't register led on channel %d\n", chan);
722 return res;
723 }
724
725 res = sysfs_create_group(&led->cdev.dev->kobj,
726 &lp5521_led_attribute_group);
727 if (res < 0) {
728 dev_err(dev, "couldn't register current attribute\n");
729 led_classdev_unregister(&led->cdev);
730 return res;
731 }
732 return 0;
733 }
734
735 static int __devinit lp5521_probe(struct i2c_client *client,
736 const struct i2c_device_id *id)
737 {
738 struct lp5521_chip *chip;
739 struct lp5521_platform_data *pdata;
740 int ret, i, led;
741 u8 buf;
742
743 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
744 if (!chip)
745 return -ENOMEM;
746
747 i2c_set_clientdata(client, chip);
748 chip->client = client;
749
750 pdata = client->dev.platform_data;
751
752 if (!pdata) {
753 dev_err(&client->dev, "no platform data\n");
754 ret = -EINVAL;
755 goto fail1;
756 }
757
758 mutex_init(&chip->lock);
759
760 chip->pdata = pdata;
761
762 if (pdata->setup_resources) {
763 ret = pdata->setup_resources();
764 if (ret < 0)
765 goto fail1;
766 }
767
768 if (pdata->enable) {
769 pdata->enable(0);
770 usleep_range(1000, 2000); /* Keep enable down at least 1ms */
771 pdata->enable(1);
772 usleep_range(1000, 2000); /* 500us abs min. */
773 }
774
775 lp5521_write(client, LP5521_REG_RESET, 0xff);
776 usleep_range(10000, 20000); /*
777 * Exact value is not available. 10 - 20ms
778 * appears to be enough for reset.
779 */
780
781 /*
782 * Make sure that the chip is reset by reading back the r channel
783 * current reg. This is dummy read is required on some platforms -
784 * otherwise further access to the R G B channels in the
785 * LP5521_REG_ENABLE register will not have any effect - strange!
786 */
787 lp5521_read(client, LP5521_REG_R_CURRENT, &buf);
788 if (buf != LP5521_REG_R_CURR_DEFAULT) {
789 dev_err(&client->dev, "error in resetting chip\n");
790 goto fail2;
791 }
792 usleep_range(10000, 20000);
793
794 ret = lp5521_detect(client);
795
796 if (ret) {
797 dev_err(&client->dev, "Chip not found\n");
798 goto fail2;
799 }
800
801 dev_info(&client->dev, "%s programmable led chip found\n", id->name);
802
803 ret = lp5521_configure(client);
804 if (ret < 0) {
805 dev_err(&client->dev, "error configuring chip\n");
806 goto fail2;
807 }
808
809 /* Initialize leds */
810 chip->num_channels = pdata->num_channels;
811 chip->num_leds = 0;
812 led = 0;
813 for (i = 0; i < pdata->num_channels; i++) {
814 /* Do not initialize channels that are not connected */
815 if (pdata->led_config[i].led_current == 0)
816 continue;
817
818 ret = lp5521_init_led(&chip->leds[led], client, i, pdata);
819 if (ret) {
820 dev_err(&client->dev, "error initializing leds\n");
821 goto fail3;
822 }
823 chip->num_leds++;
824
825 chip->leds[led].id = led;
826 /* Set initial LED current */
827 lp5521_set_led_current(chip, led,
828 chip->leds[led].led_current);
829
830 INIT_WORK(&(chip->leds[led].brightness_work),
831 lp5521_led_brightness_work);
832
833 led++;
834 }
835
836 ret = lp5521_register_sysfs(client);
837 if (ret) {
838 dev_err(&client->dev, "registering sysfs failed\n");
839 goto fail3;
840 }
841 return ret;
842 fail3:
843 for (i = 0; i < chip->num_leds; i++) {
844 led_classdev_unregister(&chip->leds[i].cdev);
845 cancel_work_sync(&chip->leds[i].brightness_work);
846 }
847 fail2:
848 if (pdata->enable)
849 pdata->enable(0);
850 if (pdata->release_resources)
851 pdata->release_resources();
852 fail1:
853 kfree(chip);
854 return ret;
855 }
856
857 static int __devexit lp5521_remove(struct i2c_client *client)
858 {
859 struct lp5521_chip *chip = i2c_get_clientdata(client);
860 int i;
861
862 lp5521_run_led_pattern(PATTERN_OFF, chip);
863 lp5521_unregister_sysfs(client);
864
865 for (i = 0; i < chip->num_leds; i++) {
866 led_classdev_unregister(&chip->leds[i].cdev);
867 cancel_work_sync(&chip->leds[i].brightness_work);
868 }
869
870 if (chip->pdata->enable)
871 chip->pdata->enable(0);
872 if (chip->pdata->release_resources)
873 chip->pdata->release_resources();
874 kfree(chip);
875 return 0;
876 }
877
878 static const struct i2c_device_id lp5521_id[] = {
879 { "lp5521", 0 }, /* Three channel chip */
880 { }
881 };
882 MODULE_DEVICE_TABLE(i2c, lp5521_id);
883
884 static struct i2c_driver lp5521_driver = {
885 .driver = {
886 .name = "lp5521",
887 },
888 .probe = lp5521_probe,
889 .remove = __devexit_p(lp5521_remove),
890 .id_table = lp5521_id,
891 };
892
893 module_i2c_driver(lp5521_driver);
894
895 MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
896 MODULE_DESCRIPTION("LP5521 LED engine");
897 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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