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leds-lp55xx: clean up init function
[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 #include <linux/platform_data/leds-lp55xx.h>
38
39 #include "leds-lp55xx-common.h"
40
41 #define LP5521_PROGRAM_LENGTH 32 /* in bytes */
42
43 #define LP5521_MAX_LEDS 3 /* Maximum number of LEDs */
44 #define LP5521_MAX_ENGINES 3 /* Maximum number of engines */
45
46 #define LP5521_ENG_MASK_BASE 0x30 /* 00110000 */
47 #define LP5521_ENG_STATUS_MASK 0x07 /* 00000111 */
48
49 #define LP5521_CMD_LOAD 0x15 /* 00010101 */
50 #define LP5521_CMD_RUN 0x2a /* 00101010 */
51 #define LP5521_CMD_DIRECT 0x3f /* 00111111 */
52 #define LP5521_CMD_DISABLED 0x00 /* 00000000 */
53
54 /* Registers */
55 #define LP5521_REG_ENABLE 0x00
56 #define LP5521_REG_OP_MODE 0x01
57 #define LP5521_REG_R_PWM 0x02
58 #define LP5521_REG_G_PWM 0x03
59 #define LP5521_REG_B_PWM 0x04
60 #define LP5521_REG_R_CURRENT 0x05
61 #define LP5521_REG_G_CURRENT 0x06
62 #define LP5521_REG_B_CURRENT 0x07
63 #define LP5521_REG_CONFIG 0x08
64 #define LP5521_REG_R_CHANNEL_PC 0x09
65 #define LP5521_REG_G_CHANNEL_PC 0x0A
66 #define LP5521_REG_B_CHANNEL_PC 0x0B
67 #define LP5521_REG_STATUS 0x0C
68 #define LP5521_REG_RESET 0x0D
69 #define LP5521_REG_GPO 0x0E
70 #define LP5521_REG_R_PROG_MEM 0x10
71 #define LP5521_REG_G_PROG_MEM 0x30
72 #define LP5521_REG_B_PROG_MEM 0x50
73
74 #define LP5521_PROG_MEM_BASE LP5521_REG_R_PROG_MEM
75 #define LP5521_PROG_MEM_SIZE 0x20
76
77 /* Base register to set LED current */
78 #define LP5521_REG_LED_CURRENT_BASE LP5521_REG_R_CURRENT
79
80 /* Base register to set the brightness */
81 #define LP5521_REG_LED_PWM_BASE LP5521_REG_R_PWM
82
83 /* Bits in ENABLE register */
84 #define LP5521_MASTER_ENABLE 0x40 /* Chip master enable */
85 #define LP5521_LOGARITHMIC_PWM 0x80 /* Logarithmic PWM adjustment */
86 #define LP5521_EXEC_RUN 0x2A
87 #define LP5521_ENABLE_DEFAULT \
88 (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM)
89 #define LP5521_ENABLE_RUN_PROGRAM \
90 (LP5521_ENABLE_DEFAULT | LP5521_EXEC_RUN)
91
92 /* Status */
93 #define LP5521_EXT_CLK_USED 0x08
94
95 /* default R channel current register value */
96 #define LP5521_REG_R_CURR_DEFAULT 0xAF
97
98 /* Pattern Mode */
99 #define PATTERN_OFF 0
100
101 /* Reset register value */
102 #define LP5521_RESET 0xFF
103
104 struct lp5521_engine {
105 int id;
106 u8 mode;
107 u8 prog_page;
108 u8 engine_mask;
109 };
110
111 struct lp5521_led {
112 int id;
113 u8 chan_nr;
114 u8 led_current;
115 u8 max_current;
116 struct led_classdev cdev;
117 struct work_struct brightness_work;
118 u8 brightness;
119 };
120
121 struct lp5521_chip {
122 struct lp5521_platform_data *pdata;
123 struct mutex lock; /* Serialize control */
124 struct i2c_client *client;
125 struct lp5521_engine engines[LP5521_MAX_ENGINES];
126 struct lp5521_led leds[LP5521_MAX_LEDS];
127 u8 num_channels;
128 u8 num_leds;
129 };
130
131 static inline void lp5521_wait_enable_done(void)
132 {
133 /* it takes more 488 us to update ENABLE register */
134 usleep_range(500, 600);
135 }
136
137 static inline struct lp5521_led *cdev_to_led(struct led_classdev *cdev)
138 {
139 return container_of(cdev, struct lp5521_led, cdev);
140 }
141
142 static inline struct lp5521_chip *engine_to_lp5521(struct lp5521_engine *engine)
143 {
144 return container_of(engine, struct lp5521_chip,
145 engines[engine->id - 1]);
146 }
147
148 static inline struct lp5521_chip *led_to_lp5521(struct lp5521_led *led)
149 {
150 return container_of(led, struct lp5521_chip,
151 leds[led->id]);
152 }
153
154 static void lp5521_led_brightness_work(struct work_struct *work);
155
156 static inline int lp5521_write(struct i2c_client *client, u8 reg, u8 value)
157 {
158 return i2c_smbus_write_byte_data(client, reg, value);
159 }
160
161 static int lp5521_read(struct i2c_client *client, u8 reg, u8 *buf)
162 {
163 s32 ret;
164
165 ret = i2c_smbus_read_byte_data(client, reg);
166 if (ret < 0)
167 return ret;
168
169 *buf = ret;
170 return 0;
171 }
172
173 static int lp5521_set_engine_mode(struct lp5521_engine *engine, u8 mode)
174 {
175 struct lp5521_chip *chip = engine_to_lp5521(engine);
176 struct i2c_client *client = chip->client;
177 int ret;
178 u8 engine_state;
179
180 /* Only transition between RUN and DIRECT mode are handled here */
181 if (mode == LP5521_CMD_LOAD)
182 return 0;
183
184 if (mode == LP5521_CMD_DISABLED)
185 mode = LP5521_CMD_DIRECT;
186
187 ret = lp5521_read(client, LP5521_REG_OP_MODE, &engine_state);
188 if (ret < 0)
189 return ret;
190
191 /* set mode only for this engine */
192 engine_state &= ~(engine->engine_mask);
193 mode &= engine->engine_mask;
194 engine_state |= mode;
195 return lp5521_write(client, LP5521_REG_OP_MODE, engine_state);
196 }
197
198 static int lp5521_load_program(struct lp5521_engine *eng, const u8 *pattern)
199 {
200 struct lp5521_chip *chip = engine_to_lp5521(eng);
201 struct i2c_client *client = chip->client;
202 int ret;
203 int addr;
204 u8 mode;
205
206 /* move current engine to direct mode and remember the state */
207 ret = lp5521_set_engine_mode(eng, LP5521_CMD_DIRECT);
208 if (ret)
209 return ret;
210
211 /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
212 usleep_range(1000, 2000);
213 ret = lp5521_read(client, LP5521_REG_OP_MODE, &mode);
214 if (ret)
215 return ret;
216
217 /* For loading, all the engines to load mode */
218 lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
219 /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
220 usleep_range(1000, 2000);
221 lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_LOAD);
222 /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
223 usleep_range(1000, 2000);
224
225 addr = LP5521_PROG_MEM_BASE + eng->prog_page * LP5521_PROG_MEM_SIZE;
226 i2c_smbus_write_i2c_block_data(client,
227 addr,
228 LP5521_PROG_MEM_SIZE,
229 pattern);
230
231 return lp5521_write(client, LP5521_REG_OP_MODE, mode);
232 }
233
234 static int lp5521_set_led_current(struct lp5521_chip *chip, int led, u8 curr)
235 {
236 return lp5521_write(chip->client,
237 LP5521_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
238 curr);
239 }
240
241 static int lp5521_post_init_device(struct lp55xx_chip *chip)
242 {
243 int ret;
244 u8 val;
245
246 /*
247 * Make sure that the chip is reset by reading back the r channel
248 * current reg. This is dummy read is required on some platforms -
249 * otherwise further access to the R G B channels in the
250 * LP5521_REG_ENABLE register will not have any effect - strange!
251 */
252 ret = lp55xx_read(chip, LP5521_REG_R_CURRENT, &val);
253 if (ret) {
254 dev_err(&chip->cl->dev, "error in resetting chip\n");
255 return ret;
256 }
257 if (val != LP5521_REG_R_CURR_DEFAULT) {
258 dev_err(&chip->cl->dev,
259 "unexpected data in register (expected 0x%x got 0x%x)\n",
260 LP5521_REG_R_CURR_DEFAULT, val);
261 ret = -EINVAL;
262 return ret;
263 }
264 usleep_range(10000, 20000);
265
266 /* Set all PWMs to direct control mode */
267 ret = lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
268
269 val = chip->pdata->update_config ?
270 : (LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO | LP5521_R_TO_BATT);
271 ret = lp55xx_write(chip, LP5521_REG_CONFIG, val);
272 if (ret)
273 return ret;
274
275 /* Initialize all channels PWM to zero -> leds off */
276 lp55xx_write(chip, LP5521_REG_R_PWM, 0);
277 lp55xx_write(chip, LP5521_REG_G_PWM, 0);
278 lp55xx_write(chip, LP5521_REG_B_PWM, 0);
279
280 /* Set engines are set to run state when OP_MODE enables engines */
281 ret = lp55xx_write(chip, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM);
282 if (ret)
283 return ret;
284
285 lp5521_wait_enable_done();
286
287 return 0;
288 }
289
290 static int lp5521_run_selftest(struct lp5521_chip *chip, char *buf)
291 {
292 int ret;
293 u8 status;
294
295 ret = lp5521_read(chip->client, LP5521_REG_STATUS, &status);
296 if (ret < 0)
297 return ret;
298
299 /* Check that ext clock is really in use if requested */
300 if (chip->pdata && chip->pdata->clock_mode == LP5521_CLOCK_EXT)
301 if ((status & LP5521_EXT_CLK_USED) == 0)
302 return -EIO;
303 return 0;
304 }
305
306 static void lp5521_set_brightness(struct led_classdev *cdev,
307 enum led_brightness brightness)
308 {
309 struct lp5521_led *led = cdev_to_led(cdev);
310 led->brightness = (u8)brightness;
311 schedule_work(&led->brightness_work);
312 }
313
314 static void lp5521_led_brightness_work(struct work_struct *work)
315 {
316 struct lp5521_led *led = container_of(work,
317 struct lp5521_led,
318 brightness_work);
319 struct lp5521_chip *chip = led_to_lp5521(led);
320 struct i2c_client *client = chip->client;
321
322 mutex_lock(&chip->lock);
323 lp5521_write(client, LP5521_REG_LED_PWM_BASE + led->chan_nr,
324 led->brightness);
325 mutex_unlock(&chip->lock);
326 }
327
328 /* Set engine mode and create appropriate sysfs attributes, if required. */
329 static int lp5521_set_mode(struct lp5521_engine *engine, u8 mode)
330 {
331 int ret = 0;
332
333 /* if in that mode already do nothing, except for run */
334 if (mode == engine->mode && mode != LP5521_CMD_RUN)
335 return 0;
336
337 if (mode == LP5521_CMD_RUN) {
338 ret = lp5521_set_engine_mode(engine, LP5521_CMD_RUN);
339 } else if (mode == LP5521_CMD_LOAD) {
340 lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED);
341 lp5521_set_engine_mode(engine, LP5521_CMD_LOAD);
342 } else if (mode == LP5521_CMD_DISABLED) {
343 lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED);
344 }
345
346 engine->mode = mode;
347
348 return ret;
349 }
350
351 static int lp5521_do_store_load(struct lp5521_engine *engine,
352 const char *buf, size_t len)
353 {
354 struct lp5521_chip *chip = engine_to_lp5521(engine);
355 struct i2c_client *client = chip->client;
356 int ret, nrchars, offset = 0, i = 0;
357 char c[3];
358 unsigned cmd;
359 u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
360
361 while ((offset < len - 1) && (i < LP5521_PROGRAM_LENGTH)) {
362 /* separate sscanfs because length is working only for %s */
363 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
364 if (ret != 2)
365 goto fail;
366 ret = sscanf(c, "%2x", &cmd);
367 if (ret != 1)
368 goto fail;
369 pattern[i] = (u8)cmd;
370
371 offset += nrchars;
372 i++;
373 }
374
375 /* Each instruction is 16bit long. Check that length is even */
376 if (i % 2)
377 goto fail;
378
379 mutex_lock(&chip->lock);
380 if (engine->mode == LP5521_CMD_LOAD)
381 ret = lp5521_load_program(engine, pattern);
382 else
383 ret = -EINVAL;
384 mutex_unlock(&chip->lock);
385
386 if (ret) {
387 dev_err(&client->dev, "failed loading pattern\n");
388 return ret;
389 }
390
391 return len;
392 fail:
393 dev_err(&client->dev, "wrong pattern format\n");
394 return -EINVAL;
395 }
396
397 static ssize_t store_engine_load(struct device *dev,
398 struct device_attribute *attr,
399 const char *buf, size_t len, int nr)
400 {
401 struct i2c_client *client = to_i2c_client(dev);
402 struct lp5521_chip *chip = i2c_get_clientdata(client);
403 return lp5521_do_store_load(&chip->engines[nr - 1], buf, len);
404 }
405
406 #define store_load(nr) \
407 static ssize_t store_engine##nr##_load(struct device *dev, \
408 struct device_attribute *attr, \
409 const char *buf, size_t len) \
410 { \
411 return store_engine_load(dev, attr, buf, len, nr); \
412 }
413 store_load(1)
414 store_load(2)
415 store_load(3)
416
417 static ssize_t show_engine_mode(struct device *dev,
418 struct device_attribute *attr,
419 char *buf, int nr)
420 {
421 struct i2c_client *client = to_i2c_client(dev);
422 struct lp5521_chip *chip = i2c_get_clientdata(client);
423 switch (chip->engines[nr - 1].mode) {
424 case LP5521_CMD_RUN:
425 return sprintf(buf, "run\n");
426 case LP5521_CMD_LOAD:
427 return sprintf(buf, "load\n");
428 case LP5521_CMD_DISABLED:
429 return sprintf(buf, "disabled\n");
430 default:
431 return sprintf(buf, "disabled\n");
432 }
433 }
434
435 #define show_mode(nr) \
436 static ssize_t show_engine##nr##_mode(struct device *dev, \
437 struct device_attribute *attr, \
438 char *buf) \
439 { \
440 return show_engine_mode(dev, attr, buf, nr); \
441 }
442 show_mode(1)
443 show_mode(2)
444 show_mode(3)
445
446 static ssize_t store_engine_mode(struct device *dev,
447 struct device_attribute *attr,
448 const char *buf, size_t len, int nr)
449 {
450 struct i2c_client *client = to_i2c_client(dev);
451 struct lp5521_chip *chip = i2c_get_clientdata(client);
452 struct lp5521_engine *engine = &chip->engines[nr - 1];
453 mutex_lock(&chip->lock);
454
455 if (!strncmp(buf, "run", 3))
456 lp5521_set_mode(engine, LP5521_CMD_RUN);
457 else if (!strncmp(buf, "load", 4))
458 lp5521_set_mode(engine, LP5521_CMD_LOAD);
459 else if (!strncmp(buf, "disabled", 8))
460 lp5521_set_mode(engine, LP5521_CMD_DISABLED);
461
462 mutex_unlock(&chip->lock);
463 return len;
464 }
465
466 #define store_mode(nr) \
467 static ssize_t store_engine##nr##_mode(struct device *dev, \
468 struct device_attribute *attr, \
469 const char *buf, size_t len) \
470 { \
471 return store_engine_mode(dev, attr, buf, len, nr); \
472 }
473 store_mode(1)
474 store_mode(2)
475 store_mode(3)
476
477 static ssize_t show_max_current(struct device *dev,
478 struct device_attribute *attr,
479 char *buf)
480 {
481 struct led_classdev *led_cdev = dev_get_drvdata(dev);
482 struct lp5521_led *led = cdev_to_led(led_cdev);
483
484 return sprintf(buf, "%d\n", led->max_current);
485 }
486
487 static ssize_t show_current(struct device *dev,
488 struct device_attribute *attr,
489 char *buf)
490 {
491 struct led_classdev *led_cdev = dev_get_drvdata(dev);
492 struct lp5521_led *led = cdev_to_led(led_cdev);
493
494 return sprintf(buf, "%d\n", led->led_current);
495 }
496
497 static ssize_t store_current(struct device *dev,
498 struct device_attribute *attr,
499 const char *buf, size_t len)
500 {
501 struct led_classdev *led_cdev = dev_get_drvdata(dev);
502 struct lp5521_led *led = cdev_to_led(led_cdev);
503 struct lp5521_chip *chip = led_to_lp5521(led);
504 ssize_t ret;
505 unsigned long curr;
506
507 if (kstrtoul(buf, 0, &curr))
508 return -EINVAL;
509
510 if (curr > led->max_current)
511 return -EINVAL;
512
513 mutex_lock(&chip->lock);
514 ret = lp5521_set_led_current(chip, led->id, curr);
515 mutex_unlock(&chip->lock);
516
517 if (ret < 0)
518 return ret;
519
520 led->led_current = (u8)curr;
521
522 return len;
523 }
524
525 static ssize_t lp5521_selftest(struct device *dev,
526 struct device_attribute *attr,
527 char *buf)
528 {
529 struct i2c_client *client = to_i2c_client(dev);
530 struct lp5521_chip *chip = i2c_get_clientdata(client);
531 int ret;
532
533 mutex_lock(&chip->lock);
534 ret = lp5521_run_selftest(chip, buf);
535 mutex_unlock(&chip->lock);
536 return sprintf(buf, "%s\n", ret ? "FAIL" : "OK");
537 }
538
539 static void lp5521_clear_program_memory(struct i2c_client *cl)
540 {
541 int i;
542 u8 rgb_mem[] = {
543 LP5521_REG_R_PROG_MEM,
544 LP5521_REG_G_PROG_MEM,
545 LP5521_REG_B_PROG_MEM,
546 };
547
548 for (i = 0; i < ARRAY_SIZE(rgb_mem); i++) {
549 lp5521_write(cl, rgb_mem[i], 0);
550 lp5521_write(cl, rgb_mem[i] + 1, 0);
551 }
552 }
553
554 static void lp5521_write_program_memory(struct i2c_client *cl,
555 u8 base, u8 *rgb, int size)
556 {
557 int i;
558
559 if (!rgb || size <= 0)
560 return;
561
562 for (i = 0; i < size; i++)
563 lp5521_write(cl, base + i, *(rgb + i));
564
565 lp5521_write(cl, base + i, 0);
566 lp5521_write(cl, base + i + 1, 0);
567 }
568
569 static inline struct lp5521_led_pattern *lp5521_get_pattern
570 (struct lp5521_chip *chip, u8 offset)
571 {
572 struct lp5521_led_pattern *ptn;
573 ptn = chip->pdata->patterns + (offset - 1);
574 return ptn;
575 }
576
577 static void lp5521_run_led_pattern(int mode, struct lp5521_chip *chip)
578 {
579 struct lp5521_led_pattern *ptn;
580 struct i2c_client *cl = chip->client;
581 int num_patterns = chip->pdata->num_patterns;
582
583 if (mode > num_patterns || !(chip->pdata->patterns))
584 return;
585
586 if (mode == PATTERN_OFF) {
587 lp5521_write(cl, LP5521_REG_ENABLE, LP5521_ENABLE_DEFAULT);
588 usleep_range(1000, 2000);
589 lp5521_write(cl, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
590 } else {
591 ptn = lp5521_get_pattern(chip, mode);
592 if (!ptn)
593 return;
594
595 lp5521_write(cl, LP5521_REG_OP_MODE, LP5521_CMD_LOAD);
596 usleep_range(1000, 2000);
597
598 lp5521_clear_program_memory(cl);
599
600 lp5521_write_program_memory(cl, LP5521_REG_R_PROG_MEM,
601 ptn->r, ptn->size_r);
602 lp5521_write_program_memory(cl, LP5521_REG_G_PROG_MEM,
603 ptn->g, ptn->size_g);
604 lp5521_write_program_memory(cl, LP5521_REG_B_PROG_MEM,
605 ptn->b, ptn->size_b);
606
607 lp5521_write(cl, LP5521_REG_OP_MODE, LP5521_CMD_RUN);
608 usleep_range(1000, 2000);
609 lp5521_write(cl, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM);
610 }
611 }
612
613 static ssize_t store_led_pattern(struct device *dev,
614 struct device_attribute *attr,
615 const char *buf, size_t len)
616 {
617 struct lp5521_chip *chip = i2c_get_clientdata(to_i2c_client(dev));
618 unsigned long val;
619 int ret;
620
621 ret = kstrtoul(buf, 16, &val);
622 if (ret)
623 return ret;
624
625 lp5521_run_led_pattern(val, chip);
626
627 return len;
628 }
629
630 /* led class device attributes */
631 static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current);
632 static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
633
634 static struct attribute *lp5521_led_attributes[] = {
635 &dev_attr_led_current.attr,
636 &dev_attr_max_current.attr,
637 NULL,
638 };
639
640 static struct attribute_group lp5521_led_attribute_group = {
641 .attrs = lp5521_led_attributes
642 };
643
644 /* device attributes */
645 static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR,
646 show_engine1_mode, store_engine1_mode);
647 static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR,
648 show_engine2_mode, store_engine2_mode);
649 static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR,
650 show_engine3_mode, store_engine3_mode);
651 static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load);
652 static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load);
653 static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load);
654 static DEVICE_ATTR(selftest, S_IRUGO, lp5521_selftest, NULL);
655 static DEVICE_ATTR(led_pattern, S_IWUSR, NULL, store_led_pattern);
656
657 static struct attribute *lp5521_attributes[] = {
658 &dev_attr_engine1_mode.attr,
659 &dev_attr_engine2_mode.attr,
660 &dev_attr_engine3_mode.attr,
661 &dev_attr_selftest.attr,
662 &dev_attr_engine1_load.attr,
663 &dev_attr_engine2_load.attr,
664 &dev_attr_engine3_load.attr,
665 &dev_attr_led_pattern.attr,
666 NULL
667 };
668
669 static const struct attribute_group lp5521_group = {
670 .attrs = lp5521_attributes,
671 };
672
673 static int lp5521_register_sysfs(struct i2c_client *client)
674 {
675 struct device *dev = &client->dev;
676 return sysfs_create_group(&dev->kobj, &lp5521_group);
677 }
678
679 static void lp5521_unregister_sysfs(struct i2c_client *client)
680 {
681 struct lp5521_chip *chip = i2c_get_clientdata(client);
682 struct device *dev = &client->dev;
683 int i;
684
685 sysfs_remove_group(&dev->kobj, &lp5521_group);
686
687 for (i = 0; i < chip->num_leds; i++)
688 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
689 &lp5521_led_attribute_group);
690 }
691
692 static void lp5521_deinit_device(struct lp5521_chip *chip)
693 {
694 struct lp5521_platform_data *pdata = chip->pdata;
695
696 if (pdata->enable)
697 pdata->enable(0);
698 if (pdata->release_resources)
699 pdata->release_resources();
700 }
701
702 static int lp5521_init_led(struct lp5521_led *led,
703 struct i2c_client *client,
704 int chan, struct lp5521_platform_data *pdata)
705 {
706 struct device *dev = &client->dev;
707 char name[32];
708 int res;
709
710 if (chan >= LP5521_MAX_LEDS)
711 return -EINVAL;
712
713 if (pdata->led_config[chan].led_current == 0)
714 return 0;
715
716 led->led_current = pdata->led_config[chan].led_current;
717 led->max_current = pdata->led_config[chan].max_current;
718 led->chan_nr = pdata->led_config[chan].chan_nr;
719
720 if (led->chan_nr >= LP5521_MAX_LEDS) {
721 dev_err(dev, "Use channel numbers between 0 and %d\n",
722 LP5521_MAX_LEDS - 1);
723 return -EINVAL;
724 }
725
726 led->cdev.brightness_set = lp5521_set_brightness;
727 if (pdata->led_config[chan].name) {
728 led->cdev.name = pdata->led_config[chan].name;
729 } else {
730 snprintf(name, sizeof(name), "%s:channel%d",
731 pdata->label ?: client->name, chan);
732 led->cdev.name = name;
733 }
734
735 res = led_classdev_register(dev, &led->cdev);
736 if (res < 0) {
737 dev_err(dev, "couldn't register led on channel %d\n", chan);
738 return res;
739 }
740
741 res = sysfs_create_group(&led->cdev.dev->kobj,
742 &lp5521_led_attribute_group);
743 if (res < 0) {
744 dev_err(dev, "couldn't register current attribute\n");
745 led_classdev_unregister(&led->cdev);
746 return res;
747 }
748 return 0;
749 }
750
751 static int lp5521_register_leds(struct lp5521_chip *chip)
752 {
753 struct lp5521_platform_data *pdata = chip->pdata;
754 struct i2c_client *client = chip->client;
755 int i;
756 int led;
757 int ret;
758
759 /* Initialize leds */
760 chip->num_channels = pdata->num_channels;
761 chip->num_leds = 0;
762 led = 0;
763 for (i = 0; i < pdata->num_channels; i++) {
764 /* Do not initialize channels that are not connected */
765 if (pdata->led_config[i].led_current == 0)
766 continue;
767
768 ret = lp5521_init_led(&chip->leds[led], client, i, pdata);
769 if (ret) {
770 dev_err(&client->dev, "error initializing leds\n");
771 return ret;
772 }
773 chip->num_leds++;
774
775 chip->leds[led].id = led;
776 /* Set initial LED current */
777 lp5521_set_led_current(chip, led,
778 chip->leds[led].led_current);
779
780 INIT_WORK(&(chip->leds[led].brightness_work),
781 lp5521_led_brightness_work);
782
783 led++;
784 }
785
786 return 0;
787 }
788
789 static void lp5521_unregister_leds(struct lp5521_chip *chip)
790 {
791 int i;
792
793 for (i = 0; i < chip->num_leds; i++) {
794 led_classdev_unregister(&chip->leds[i].cdev);
795 cancel_work_sync(&chip->leds[i].brightness_work);
796 }
797 }
798
799 /* Chip specific configurations */
800 static struct lp55xx_device_config lp5521_cfg = {
801 .reset = {
802 .addr = LP5521_REG_RESET,
803 .val = LP5521_RESET,
804 },
805 .enable = {
806 .addr = LP5521_REG_ENABLE,
807 .val = LP5521_ENABLE_DEFAULT,
808 },
809 .post_init_device = lp5521_post_init_device,
810 };
811
812 static int lp5521_probe(struct i2c_client *client,
813 const struct i2c_device_id *id)
814 {
815 struct lp5521_chip *old_chip = NULL;
816 int ret;
817 struct lp55xx_chip *chip;
818 struct lp55xx_led *led;
819 struct lp55xx_platform_data *pdata = client->dev.platform_data;
820
821 if (!pdata) {
822 dev_err(&client->dev, "no platform data\n");
823 return -EINVAL;
824 }
825
826 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
827 if (!chip)
828 return -ENOMEM;
829
830 led = devm_kzalloc(&client->dev,
831 sizeof(*led) * pdata->num_channels, GFP_KERNEL);
832 if (!led)
833 return -ENOMEM;
834
835 chip->cl = client;
836 chip->pdata = pdata;
837 chip->cfg = &lp5521_cfg;
838
839 mutex_init(&chip->lock);
840
841 i2c_set_clientdata(client, led);
842
843 ret = lp55xx_init_device(chip);
844 if (ret)
845 goto err_init;
846
847 dev_info(&client->dev, "%s programmable led chip found\n", id->name);
848
849 ret = lp5521_register_leds(old_chip);
850 if (ret)
851 goto fail2;
852
853 ret = lp5521_register_sysfs(client);
854 if (ret) {
855 dev_err(&client->dev, "registering sysfs failed\n");
856 goto fail2;
857 }
858 return ret;
859 fail2:
860 lp5521_unregister_leds(old_chip);
861 lp5521_deinit_device(old_chip);
862 err_init:
863 return ret;
864 }
865
866 static int lp5521_remove(struct i2c_client *client)
867 {
868 struct lp5521_chip *old_chip = i2c_get_clientdata(client);
869
870 lp5521_run_led_pattern(PATTERN_OFF, old_chip);
871 lp5521_unregister_sysfs(client);
872
873 lp5521_unregister_leds(old_chip);
874
875 lp5521_deinit_device(old_chip);
876 return 0;
877 }
878
879 static const struct i2c_device_id lp5521_id[] = {
880 { "lp5521", 0 }, /* Three channel chip */
881 { }
882 };
883 MODULE_DEVICE_TABLE(i2c, lp5521_id);
884
885 static struct i2c_driver lp5521_driver = {
886 .driver = {
887 .name = "lp5521",
888 },
889 .probe = lp5521_probe,
890 .remove = lp5521_remove,
891 .id_table = lp5521_id,
892 };
893
894 module_i2c_driver(lp5521_driver);
895
896 MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
897 MODULE_DESCRIPTION("LP5521 LED engine");
898 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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