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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / leds / leds-lp5523.c
blob4ade66a2d9d4758b314c45ed52a222ff0cb0aeca
1 /*
2 * lp5523.c - LP5523 LED Driver
3 *
4 * Copyright (C) 2010 Nokia Corporation
5 * Copyright (C) 2012 Texas Instruments
6 *
7 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
8 * Milo(Woogyom) Kim <milo.kim@ti.com>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * version 2 as published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
22 * 02110-1301 USA
23 */
24
25 #include <linux/delay.h>
26 #include <linux/firmware.h>
27 #include <linux/i2c.h>
28 #include <linux/init.h>
29 #include <linux/leds.h>
30 #include <linux/module.h>
31 #include <linux/mutex.h>
32 #include <linux/of.h>
33 #include <linux/platform_data/leds-lp55xx.h>
34 #include <linux/slab.h>
35
36 #include "leds-lp55xx-common.h"
37
38 #define LP5523_PROGRAM_LENGTH 32 /* bytes */
39 /* Memory is used like this:
40 0x00 engine 1 program
41 0x10 engine 2 program
42 0x20 engine 3 program
43 0x30 engine 1 muxing info
44 0x40 engine 2 muxing info
45 0x50 engine 3 muxing info
46 */
47 #define LP5523_MAX_LEDS 9
48
49 /* Registers */
50 #define LP5523_REG_ENABLE 0x00
51 #define LP5523_REG_OP_MODE 0x01
52 #define LP5523_REG_ENABLE_LEDS_MSB 0x04
53 #define LP5523_REG_ENABLE_LEDS_LSB 0x05
54 #define LP5523_REG_LED_PWM_BASE 0x16
55 #define LP5523_REG_LED_CURRENT_BASE 0x26
56 #define LP5523_REG_CONFIG 0x36
57 #define LP5523_REG_STATUS 0x3A
58 #define LP5523_REG_RESET 0x3D
59 #define LP5523_REG_LED_TEST_CTRL 0x41
60 #define LP5523_REG_LED_TEST_ADC 0x42
61 #define LP5523_REG_CH1_PROG_START 0x4C
62 #define LP5523_REG_CH2_PROG_START 0x4D
63 #define LP5523_REG_CH3_PROG_START 0x4E
64 #define LP5523_REG_PROG_PAGE_SEL 0x4F
65 #define LP5523_REG_PROG_MEM 0x50
66
67 /* Bit description in registers */
68 #define LP5523_ENABLE 0x40
69 #define LP5523_AUTO_INC 0x40
70 #define LP5523_PWR_SAVE 0x20
71 #define LP5523_PWM_PWR_SAVE 0x04
72 #define LP5523_CP_AUTO 0x18
73 #define LP5523_AUTO_CLK 0x02
74
75 #define LP5523_EN_LEDTEST 0x80
76 #define LP5523_LEDTEST_DONE 0x80
77 #define LP5523_RESET 0xFF
78 #define LP5523_ADC_SHORTCIRC_LIM 80
79 #define LP5523_EXT_CLK_USED 0x08
80 #define LP5523_ENG_STATUS_MASK 0x07
81
82 /* Memory Page Selection */
83 #define LP5523_PAGE_ENG1 0
84 #define LP5523_PAGE_ENG2 1
85 #define LP5523_PAGE_ENG3 2
86 #define LP5523_PAGE_MUX1 3
87 #define LP5523_PAGE_MUX2 4
88 #define LP5523_PAGE_MUX3 5
89
90 /* Program Memory Operations */
91 #define LP5523_MODE_ENG1_M 0x30 /* Operation Mode Register */
92 #define LP5523_MODE_ENG2_M 0x0C
93 #define LP5523_MODE_ENG3_M 0x03
94 #define LP5523_LOAD_ENG1 0x10
95 #define LP5523_LOAD_ENG2 0x04
96 #define LP5523_LOAD_ENG3 0x01
97
98 #define LP5523_ENG1_IS_LOADING(mode) \
99 ((mode & LP5523_MODE_ENG1_M) == LP5523_LOAD_ENG1)
100 #define LP5523_ENG2_IS_LOADING(mode) \
101 ((mode & LP5523_MODE_ENG2_M) == LP5523_LOAD_ENG2)
102 #define LP5523_ENG3_IS_LOADING(mode) \
103 ((mode & LP5523_MODE_ENG3_M) == LP5523_LOAD_ENG3)
104
105 #define LP5523_EXEC_ENG1_M 0x30 /* Enable Register */
106 #define LP5523_EXEC_ENG2_M 0x0C
107 #define LP5523_EXEC_ENG3_M 0x03
108 #define LP5523_EXEC_M 0x3F
109 #define LP5523_RUN_ENG1 0x20
110 #define LP5523_RUN_ENG2 0x08
111 #define LP5523_RUN_ENG3 0x02
112
113 #define LED_ACTIVE(mux, led) (!!(mux & (0x0001 << led)))
114
115 enum lp5523_chip_id {
116 LP5523,
117 LP55231,
118 };
119
120 static int lp5523_init_program_engine(struct lp55xx_chip *chip);
121
122 static inline void lp5523_wait_opmode_done(void)
123 {
124 usleep_range(1000, 2000);
125 }
126
127 static void lp5523_set_led_current(struct lp55xx_led *led, u8 led_current)
128 {
129 led->led_current = led_current;
130 lp55xx_write(led->chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
131 led_current);
132 }
133
134 static int lp5523_post_init_device(struct lp55xx_chip *chip)
135 {
136 int ret;
137
138 ret = lp55xx_write(chip, LP5523_REG_ENABLE, LP5523_ENABLE);
139 if (ret)
140 return ret;
141
142 /* Chip startup time is 500 us, 1 - 2 ms gives some margin */
143 usleep_range(1000, 2000);
144
145 ret = lp55xx_write(chip, LP5523_REG_CONFIG,
146 LP5523_AUTO_INC | LP5523_PWR_SAVE |
147 LP5523_CP_AUTO | LP5523_AUTO_CLK |
148 LP5523_PWM_PWR_SAVE);
149 if (ret)
150 return ret;
151
152 /* turn on all leds */
153 ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
154 if (ret)
155 return ret;
156
157 ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
158 if (ret)
159 return ret;
160
161 return lp5523_init_program_engine(chip);
162 }
163
164 static void lp5523_load_engine(struct lp55xx_chip *chip)
165 {
166 enum lp55xx_engine_index idx = chip->engine_idx;
167 u8 mask[] = {
168 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M,
169 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M,
170 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M,
171 };
172
173 u8 val[] = {
174 [LP55XX_ENGINE_1] = LP5523_LOAD_ENG1,
175 [LP55XX_ENGINE_2] = LP5523_LOAD_ENG2,
176 [LP55XX_ENGINE_3] = LP5523_LOAD_ENG3,
177 };
178
179 lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], val[idx]);
180
181 lp5523_wait_opmode_done();
182 }
183
184 static void lp5523_load_engine_and_select_page(struct lp55xx_chip *chip)
185 {
186 enum lp55xx_engine_index idx = chip->engine_idx;
187 u8 page_sel[] = {
188 [LP55XX_ENGINE_1] = LP5523_PAGE_ENG1,
189 [LP55XX_ENGINE_2] = LP5523_PAGE_ENG2,
190 [LP55XX_ENGINE_3] = LP5523_PAGE_ENG3,
191 };
192
193 lp5523_load_engine(chip);
194
195 lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, page_sel[idx]);
196 }
197
198 static void lp5523_stop_all_engines(struct lp55xx_chip *chip)
199 {
200 lp55xx_write(chip, LP5523_REG_OP_MODE, 0);
201 lp5523_wait_opmode_done();
202 }
203
204 static void lp5523_stop_engine(struct lp55xx_chip *chip)
205 {
206 enum lp55xx_engine_index idx = chip->engine_idx;
207 u8 mask[] = {
208 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M,
209 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M,
210 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M,
211 };
212
213 lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], 0);
214
215 lp5523_wait_opmode_done();
216 }
217
218 static void lp5523_turn_off_channels(struct lp55xx_chip *chip)
219 {
220 int i;
221
222 for (i = 0; i < LP5523_MAX_LEDS; i++)
223 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0);
224 }
225
226 static void lp5523_run_engine(struct lp55xx_chip *chip, bool start)
227 {
228 int ret;
229 u8 mode;
230 u8 exec;
231
232 /* stop engine */
233 if (!start) {
234 lp5523_stop_engine(chip);
235 lp5523_turn_off_channels(chip);
236 return;
237 }
238
239 /*
240 * To run the engine,
241 * operation mode and enable register should updated at the same time
242 */
243
244 ret = lp55xx_read(chip, LP5523_REG_OP_MODE, &mode);
245 if (ret)
246 return;
247
248 ret = lp55xx_read(chip, LP5523_REG_ENABLE, &exec);
249 if (ret)
250 return;
251
252 /* change operation mode to RUN only when each engine is loading */
253 if (LP5523_ENG1_IS_LOADING(mode)) {
254 mode = (mode & ~LP5523_MODE_ENG1_M) | LP5523_RUN_ENG1;
255 exec = (exec & ~LP5523_EXEC_ENG1_M) | LP5523_RUN_ENG1;
256 }
257
258 if (LP5523_ENG2_IS_LOADING(mode)) {
259 mode = (mode & ~LP5523_MODE_ENG2_M) | LP5523_RUN_ENG2;
260 exec = (exec & ~LP5523_EXEC_ENG2_M) | LP5523_RUN_ENG2;
261 }
262
263 if (LP5523_ENG3_IS_LOADING(mode)) {
264 mode = (mode & ~LP5523_MODE_ENG3_M) | LP5523_RUN_ENG3;
265 exec = (exec & ~LP5523_EXEC_ENG3_M) | LP5523_RUN_ENG3;
266 }
267
268 lp55xx_write(chip, LP5523_REG_OP_MODE, mode);
269 lp5523_wait_opmode_done();
270
271 lp55xx_update_bits(chip, LP5523_REG_ENABLE, LP5523_EXEC_M, exec);
272 }
273
274 static int lp5523_init_program_engine(struct lp55xx_chip *chip)
275 {
276 int i;
277 int j;
278 int ret;
279 u8 status;
280 /* one pattern per engine setting LED MUX start and stop addresses */
281 static const u8 pattern[][LP5523_PROGRAM_LENGTH] = {
282 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
283 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
284 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
285 };
286
287 /* hardcode 32 bytes of memory for each engine from program memory */
288 ret = lp55xx_write(chip, LP5523_REG_CH1_PROG_START, 0x00);
289 if (ret)
290 return ret;
291
292 ret = lp55xx_write(chip, LP5523_REG_CH2_PROG_START, 0x10);
293 if (ret)
294 return ret;
295
296 ret = lp55xx_write(chip, LP5523_REG_CH3_PROG_START, 0x20);
297 if (ret)
298 return ret;
299
300 /* write LED MUX address space for each engine */
301 for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) {
302 chip->engine_idx = i;
303 lp5523_load_engine_and_select_page(chip);
304
305 for (j = 0; j < LP5523_PROGRAM_LENGTH; j++) {
306 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + j,
307 pattern[i - 1][j]);
308 if (ret)
309 goto out;
310 }
311 }
312
313 lp5523_run_engine(chip, true);
314
315 /* Let the programs run for couple of ms and check the engine status */
316 usleep_range(3000, 6000);
317 lp55xx_read(chip, LP5523_REG_STATUS, &status);
318 status &= LP5523_ENG_STATUS_MASK;
319
320 if (status != LP5523_ENG_STATUS_MASK) {
321 dev_err(&chip->cl->dev,
322 "cound not configure LED engine, status = 0x%.2x\n",
323 status);
324 ret = -1;
325 }
326
327 out:
328 lp5523_stop_all_engines(chip);
329 return ret;
330 }
331
332 static int lp5523_update_program_memory(struct lp55xx_chip *chip,
333 const u8 *data, size_t size)
334 {
335 u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
336 unsigned cmd;
337 char c[3];
338 int nrchars;
339 int ret;
340 int offset = 0;
341 int i = 0;
342
343 while ((offset < size - 1) && (i < LP5523_PROGRAM_LENGTH)) {
344 /* separate sscanfs because length is working only for %s */
345 ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
346 if (ret != 1)
347 goto err;
348
349 ret = sscanf(c, "%2x", &cmd);
350 if (ret != 1)
351 goto err;
352
353 pattern[i] = (u8)cmd;
354 offset += nrchars;
355 i++;
356 }
357
358 /* Each instruction is 16bit long. Check that length is even */
359 if (i % 2)
360 goto err;
361
362 for (i = 0; i < LP5523_PROGRAM_LENGTH; i++) {
363 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + i, pattern[i]);
364 if (ret)
365 return -EINVAL;
366 }
367
368 return size;
369
370 err:
371 dev_err(&chip->cl->dev, "wrong pattern format\n");
372 return -EINVAL;
373 }
374
375 static void lp5523_firmware_loaded(struct lp55xx_chip *chip)
376 {
377 const struct firmware *fw = chip->fw;
378
379 if (fw->size > LP5523_PROGRAM_LENGTH) {
380 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
381 fw->size);
382 return;
383 }
384
385 /*
386 * Program momery sequence
387 * 1) set engine mode to "LOAD"
388 * 2) write firmware data into program memory
389 */
390
391 lp5523_load_engine_and_select_page(chip);
392 lp5523_update_program_memory(chip, fw->data, fw->size);
393 }
394
395 static ssize_t show_engine_mode(struct device *dev,
396 struct device_attribute *attr,
397 char *buf, int nr)
398 {
399 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
400 struct lp55xx_chip *chip = led->chip;
401 enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode;
402
403 switch (mode) {
404 case LP55XX_ENGINE_RUN:
405 return sprintf(buf, "run\n");
406 case LP55XX_ENGINE_LOAD:
407 return sprintf(buf, "load\n");
408 case LP55XX_ENGINE_DISABLED:
409 default:
410 return sprintf(buf, "disabled\n");
411 }
412 }
413 show_mode(1)
414 show_mode(2)
415 show_mode(3)
416
417 static ssize_t store_engine_mode(struct device *dev,
418 struct device_attribute *attr,
419 const char *buf, size_t len, int nr)
420 {
421 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
422 struct lp55xx_chip *chip = led->chip;
423 struct lp55xx_engine *engine = &chip->engines[nr - 1];
424
425 mutex_lock(&chip->lock);
426
427 chip->engine_idx = nr;
428
429 if (!strncmp(buf, "run", 3)) {
430 lp5523_run_engine(chip, true);
431 engine->mode = LP55XX_ENGINE_RUN;
432 } else if (!strncmp(buf, "load", 4)) {
433 lp5523_stop_engine(chip);
434 lp5523_load_engine(chip);
435 engine->mode = LP55XX_ENGINE_LOAD;
436 } else if (!strncmp(buf, "disabled", 8)) {
437 lp5523_stop_engine(chip);
438 engine->mode = LP55XX_ENGINE_DISABLED;
439 }
440
441 mutex_unlock(&chip->lock);
442
443 return len;
444 }
445 store_mode(1)
446 store_mode(2)
447 store_mode(3)
448
449 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
450 {
451 u16 tmp_mux = 0;
452 int i;
453
454 len = min_t(int, len, LP5523_MAX_LEDS);
455
456 for (i = 0; i < len; i++) {
457 switch (buf[i]) {
458 case '1':
459 tmp_mux |= (1 << i);
460 break;
461 case '0':
462 break;
463 case '\n':
464 i = len;
465 break;
466 default:
467 return -1;
468 }
469 }
470 *mux = tmp_mux;
471
472 return 0;
473 }
474
475 static void lp5523_mux_to_array(u16 led_mux, char *array)
476 {
477 int i, pos = 0;
478 for (i = 0; i < LP5523_MAX_LEDS; i++)
479 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
480
481 array[pos] = '\0';
482 }
483
484 static ssize_t show_engine_leds(struct device *dev,
485 struct device_attribute *attr,
486 char *buf, int nr)
487 {
488 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
489 struct lp55xx_chip *chip = led->chip;
490 char mux[LP5523_MAX_LEDS + 1];
491
492 lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
493
494 return sprintf(buf, "%s\n", mux);
495 }
496 show_leds(1)
497 show_leds(2)
498 show_leds(3)
499
500 static int lp5523_load_mux(struct lp55xx_chip *chip, u16 mux, int nr)
501 {
502 struct lp55xx_engine *engine = &chip->engines[nr - 1];
503 int ret;
504 u8 mux_page[] = {
505 [LP55XX_ENGINE_1] = LP5523_PAGE_MUX1,
506 [LP55XX_ENGINE_2] = LP5523_PAGE_MUX2,
507 [LP55XX_ENGINE_3] = LP5523_PAGE_MUX3,
508 };
509
510 lp5523_load_engine(chip);
511
512 ret = lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, mux_page[nr]);
513 if (ret)
514 return ret;
515
516 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM , (u8)(mux >> 8));
517 if (ret)
518 return ret;
519
520 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + 1, (u8)(mux));
521 if (ret)
522 return ret;
523
524 engine->led_mux = mux;
525 return 0;
526 }
527
528 static ssize_t store_engine_leds(struct device *dev,
529 struct device_attribute *attr,
530 const char *buf, size_t len, int nr)
531 {
532 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
533 struct lp55xx_chip *chip = led->chip;
534 struct lp55xx_engine *engine = &chip->engines[nr - 1];
535 u16 mux = 0;
536 ssize_t ret;
537
538 if (lp5523_mux_parse(buf, &mux, len))
539 return -EINVAL;
540
541 mutex_lock(&chip->lock);
542
543 chip->engine_idx = nr;
544 ret = -EINVAL;
545
546 if (engine->mode != LP55XX_ENGINE_LOAD)
547 goto leave;
548
549 if (lp5523_load_mux(chip, mux, nr))
550 goto leave;
551
552 ret = len;
553 leave:
554 mutex_unlock(&chip->lock);
555 return ret;
556 }
557 store_leds(1)
558 store_leds(2)
559 store_leds(3)
560
561 static ssize_t store_engine_load(struct device *dev,
562 struct device_attribute *attr,
563 const char *buf, size_t len, int nr)
564 {
565 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
566 struct lp55xx_chip *chip = led->chip;
567 int ret;
568
569 mutex_lock(&chip->lock);
570
571 chip->engine_idx = nr;
572 lp5523_load_engine_and_select_page(chip);
573 ret = lp5523_update_program_memory(chip, buf, len);
574
575 mutex_unlock(&chip->lock);
576
577 return ret;
578 }
579 store_load(1)
580 store_load(2)
581 store_load(3)
582
583 static ssize_t lp5523_selftest(struct device *dev,
584 struct device_attribute *attr,
585 char *buf)
586 {
587 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
588 struct lp55xx_chip *chip = led->chip;
589 struct lp55xx_platform_data *pdata = chip->pdata;
590 int i, ret, pos = 0;
591 u8 status, adc, vdd;
592
593 mutex_lock(&chip->lock);
594
595 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
596 if (ret < 0)
597 goto fail;
598
599 /* Check that ext clock is really in use if requested */
600 if (pdata->clock_mode == LP55XX_CLOCK_EXT) {
601 if ((status & LP5523_EXT_CLK_USED) == 0)
602 goto fail;
603 }
604
605 /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
606 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, LP5523_EN_LEDTEST | 16);
607 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
608 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
609 if (ret < 0)
610 goto fail;
611
612 if (!(status & LP5523_LEDTEST_DONE))
613 usleep_range(3000, 6000); /* Was not ready. Wait little bit */
614
615 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &vdd);
616 if (ret < 0)
617 goto fail;
618
619 vdd--; /* There may be some fluctuation in measurement */
620
621 for (i = 0; i < LP5523_MAX_LEDS; i++) {
622 /* Skip non-existing channels */
623 if (pdata->led_config[i].led_current == 0)
624 continue;
625
626 /* Set default current */
627 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i,
628 pdata->led_config[i].led_current);
629
630 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0xff);
631 /* let current stabilize 2 - 4ms before measurements start */
632 usleep_range(2000, 4000);
633 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL,
634 LP5523_EN_LEDTEST | i);
635 /* ADC conversion time is 2.7 ms typically */
636 usleep_range(3000, 6000);
637 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
638 if (ret < 0)
639 goto fail;
640
641 if (!(status & LP5523_LEDTEST_DONE))
642 usleep_range(3000, 6000);/* Was not ready. Wait. */
643
644 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &adc);
645 if (ret < 0)
646 goto fail;
647
648 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
649 pos += sprintf(buf + pos, "LED %d FAIL\n", i);
650
651 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0x00);
652
653 /* Restore current */
654 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i,
655 led->led_current);
656 led++;
657 }
658 if (pos == 0)
659 pos = sprintf(buf, "OK\n");
660 goto release_lock;
661 fail:
662 pos = sprintf(buf, "FAIL\n");
663
664 release_lock:
665 mutex_unlock(&chip->lock);
666
667 return pos;
668 }
669
670 static void lp5523_led_brightness_work(struct work_struct *work)
671 {
672 struct lp55xx_led *led = container_of(work, struct lp55xx_led,
673 brightness_work);
674 struct lp55xx_chip *chip = led->chip;
675
676 mutex_lock(&chip->lock);
677 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr,
678 led->brightness);
679 mutex_unlock(&chip->lock);
680 }
681
682 static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode);
683 static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode);
684 static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode);
685 static LP55XX_DEV_ATTR_RW(engine1_leds, show_engine1_leds, store_engine1_leds);
686 static LP55XX_DEV_ATTR_RW(engine2_leds, show_engine2_leds, store_engine2_leds);
687 static LP55XX_DEV_ATTR_RW(engine3_leds, show_engine3_leds, store_engine3_leds);
688 static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load);
689 static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load);
690 static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load);
691 static LP55XX_DEV_ATTR_RO(selftest, lp5523_selftest);
692
693 static struct attribute *lp5523_attributes[] = {
694 &dev_attr_engine1_mode.attr,
695 &dev_attr_engine2_mode.attr,
696 &dev_attr_engine3_mode.attr,
697 &dev_attr_engine1_load.attr,
698 &dev_attr_engine2_load.attr,
699 &dev_attr_engine3_load.attr,
700 &dev_attr_engine1_leds.attr,
701 &dev_attr_engine2_leds.attr,
702 &dev_attr_engine3_leds.attr,
703 &dev_attr_selftest.attr,
704 NULL,
705 };
706
707 static const struct attribute_group lp5523_group = {
708 .attrs = lp5523_attributes,
709 };
710
711 /* Chip specific configurations */
712 static struct lp55xx_device_config lp5523_cfg = {
713 .reset = {
714 .addr = LP5523_REG_RESET,
715 .val = LP5523_RESET,
716 },
717 .enable = {
718 .addr = LP5523_REG_ENABLE,
719 .val = LP5523_ENABLE,
720 },
721 .max_channel = LP5523_MAX_LEDS,
722 .post_init_device = lp5523_post_init_device,
723 .brightness_work_fn = lp5523_led_brightness_work,
724 .set_led_current = lp5523_set_led_current,
725 .firmware_cb = lp5523_firmware_loaded,
726 .run_engine = lp5523_run_engine,
727 .dev_attr_group = &lp5523_group,
728 };
729
730 static int lp5523_probe(struct i2c_client *client,
731 const struct i2c_device_id *id)
732 {
733 int ret;
734 struct lp55xx_chip *chip;
735 struct lp55xx_led *led;
736 struct lp55xx_platform_data *pdata;
737 struct device_node *np = client->dev.of_node;
738
739 if (!dev_get_platdata(&client->dev)) {
740 if (np) {
741 ret = lp55xx_of_populate_pdata(&client->dev, np);
742 if (ret < 0)
743 return ret;
744 } else {
745 dev_err(&client->dev, "no platform data\n");
746 return -EINVAL;
747 }
748 }
749 pdata = dev_get_platdata(&client->dev);
750
751 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
752 if (!chip)
753 return -ENOMEM;
754
755 led = devm_kzalloc(&client->dev,
756 sizeof(*led) * pdata->num_channels, GFP_KERNEL);
757 if (!led)
758 return -ENOMEM;
759
760 chip->cl = client;
761 chip->pdata = pdata;
762 chip->cfg = &lp5523_cfg;
763
764 mutex_init(&chip->lock);
765
766 i2c_set_clientdata(client, led);
767
768 ret = lp55xx_init_device(chip);
769 if (ret)
770 goto err_init;
771
772 dev_info(&client->dev, "%s Programmable led chip found\n", id->name);
773
774 ret = lp55xx_register_leds(led, chip);
775 if (ret)
776 goto err_register_leds;
777
778 ret = lp55xx_register_sysfs(chip);
779 if (ret) {
780 dev_err(&client->dev, "registering sysfs failed\n");
781 goto err_register_sysfs;
782 }
783
784 return 0;
785
786 err_register_sysfs:
787 lp55xx_unregister_leds(led, chip);
788 err_register_leds:
789 lp55xx_deinit_device(chip);
790 err_init:
791 return ret;
792 }
793
794 static int lp5523_remove(struct i2c_client *client)
795 {
796 struct lp55xx_led *led = i2c_get_clientdata(client);
797 struct lp55xx_chip *chip = led->chip;
798
799 lp5523_stop_all_engines(chip);
800 lp55xx_unregister_sysfs(chip);
801 lp55xx_unregister_leds(led, chip);
802 lp55xx_deinit_device(chip);
803
804 return 0;
805 }
806
807 static const struct i2c_device_id lp5523_id[] = {
808 { "lp5523", LP5523 },
809 { "lp55231", LP55231 },
810 { }
811 };
812
813 MODULE_DEVICE_TABLE(i2c, lp5523_id);
814
815 #ifdef CONFIG_OF
816 static const struct of_device_id of_lp5523_leds_match[] = {
817 { .compatible = "national,lp5523", },
818 {},
819 };
820
821 MODULE_DEVICE_TABLE(of, of_lp5523_leds_match);
822 #endif
823
824 static struct i2c_driver lp5523_driver = {
825 .driver = {
826 .name = "lp5523x",
827 .of_match_table = of_match_ptr(of_lp5523_leds_match),
828 },
829 .probe = lp5523_probe,
830 .remove = lp5523_remove,
831 .id_table = lp5523_id,
832 };
833
834 module_i2c_driver(lp5523_driver);
835
836 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
837 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
838 MODULE_DESCRIPTION("LP5523 LED engine");
839 MODULE_LICENSE("GPL");
Linux with added FPC-III support