Merge tag 'thermal-v5.11-2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-microblaze.git] / drivers / leds / leds-lp5523.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * lp5523.c - LP5523, LP55231 LED Driver
4  *
5  * Copyright (C) 2010 Nokia Corporation
6  * Copyright (C) 2012 Texas Instruments
7  *
8  * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
9  *          Milo(Woogyom) Kim <milo.kim@ti.com>
10  */
11
12 #include <linux/delay.h>
13 #include <linux/firmware.h>
14 #include <linux/i2c.h>
15 #include <linux/leds.h>
16 #include <linux/module.h>
17 #include <linux/mutex.h>
18 #include <linux/of.h>
19 #include <linux/platform_data/leds-lp55xx.h>
20 #include <linux/slab.h>
21
22 #include "leds-lp55xx-common.h"
23
24 #define LP5523_PROGRAM_LENGTH           32      /* bytes */
25 /* Memory is used like this:
26  * 0x00 engine 1 program
27  * 0x10 engine 2 program
28  * 0x20 engine 3 program
29  * 0x30 engine 1 muxing info
30  * 0x40 engine 2 muxing info
31  * 0x50 engine 3 muxing info
32  */
33 #define LP5523_MAX_LEDS                 9
34
35 /* Registers */
36 #define LP5523_REG_ENABLE               0x00
37 #define LP5523_REG_OP_MODE              0x01
38 #define LP5523_REG_ENABLE_LEDS_MSB      0x04
39 #define LP5523_REG_ENABLE_LEDS_LSB      0x05
40 #define LP5523_REG_LED_CTRL_BASE        0x06
41 #define LP5523_REG_LED_PWM_BASE         0x16
42 #define LP5523_REG_LED_CURRENT_BASE     0x26
43 #define LP5523_REG_CONFIG               0x36
44 #define LP5523_REG_STATUS               0x3A
45 #define LP5523_REG_RESET                0x3D
46 #define LP5523_REG_LED_TEST_CTRL        0x41
47 #define LP5523_REG_LED_TEST_ADC         0x42
48 #define LP5523_REG_MASTER_FADER_BASE    0x48
49 #define LP5523_REG_CH1_PROG_START       0x4C
50 #define LP5523_REG_CH2_PROG_START       0x4D
51 #define LP5523_REG_CH3_PROG_START       0x4E
52 #define LP5523_REG_PROG_PAGE_SEL        0x4F
53 #define LP5523_REG_PROG_MEM             0x50
54
55 /* Bit description in registers */
56 #define LP5523_ENABLE                   0x40
57 #define LP5523_AUTO_INC                 0x40
58 #define LP5523_PWR_SAVE                 0x20
59 #define LP5523_PWM_PWR_SAVE             0x04
60 #define LP5523_CP_AUTO                  0x18
61 #define LP5523_AUTO_CLK                 0x02
62
63 #define LP5523_EN_LEDTEST               0x80
64 #define LP5523_LEDTEST_DONE             0x80
65 #define LP5523_RESET                    0xFF
66 #define LP5523_ADC_SHORTCIRC_LIM        80
67 #define LP5523_EXT_CLK_USED             0x08
68 #define LP5523_ENG_STATUS_MASK          0x07
69
70 #define LP5523_FADER_MAPPING_MASK       0xC0
71 #define LP5523_FADER_MAPPING_SHIFT      6
72
73 /* Memory Page Selection */
74 #define LP5523_PAGE_ENG1                0
75 #define LP5523_PAGE_ENG2                1
76 #define LP5523_PAGE_ENG3                2
77 #define LP5523_PAGE_MUX1                3
78 #define LP5523_PAGE_MUX2                4
79 #define LP5523_PAGE_MUX3                5
80
81 /* Program Memory Operations */
82 #define LP5523_MODE_ENG1_M              0x30    /* Operation Mode Register */
83 #define LP5523_MODE_ENG2_M              0x0C
84 #define LP5523_MODE_ENG3_M              0x03
85 #define LP5523_LOAD_ENG1                0x10
86 #define LP5523_LOAD_ENG2                0x04
87 #define LP5523_LOAD_ENG3                0x01
88
89 #define LP5523_ENG1_IS_LOADING(mode)    \
90         ((mode & LP5523_MODE_ENG1_M) == LP5523_LOAD_ENG1)
91 #define LP5523_ENG2_IS_LOADING(mode)    \
92         ((mode & LP5523_MODE_ENG2_M) == LP5523_LOAD_ENG2)
93 #define LP5523_ENG3_IS_LOADING(mode)    \
94         ((mode & LP5523_MODE_ENG3_M) == LP5523_LOAD_ENG3)
95
96 #define LP5523_EXEC_ENG1_M              0x30    /* Enable Register */
97 #define LP5523_EXEC_ENG2_M              0x0C
98 #define LP5523_EXEC_ENG3_M              0x03
99 #define LP5523_EXEC_M                   0x3F
100 #define LP5523_RUN_ENG1                 0x20
101 #define LP5523_RUN_ENG2                 0x08
102 #define LP5523_RUN_ENG3                 0x02
103
104 #define LED_ACTIVE(mux, led)            (!!(mux & (0x0001 << led)))
105
106 enum lp5523_chip_id {
107         LP5523,
108         LP55231,
109 };
110
111 static int lp5523_init_program_engine(struct lp55xx_chip *chip);
112
113 static inline void lp5523_wait_opmode_done(void)
114 {
115         usleep_range(1000, 2000);
116 }
117
118 static void lp5523_set_led_current(struct lp55xx_led *led, u8 led_current)
119 {
120         led->led_current = led_current;
121         lp55xx_write(led->chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
122                 led_current);
123 }
124
125 static int lp5523_post_init_device(struct lp55xx_chip *chip)
126 {
127         int ret;
128
129         ret = lp55xx_write(chip, LP5523_REG_ENABLE, LP5523_ENABLE);
130         if (ret)
131                 return ret;
132
133         /* Chip startup time is 500 us, 1 - 2 ms gives some margin */
134         usleep_range(1000, 2000);
135
136         ret = lp55xx_write(chip, LP5523_REG_CONFIG,
137                             LP5523_AUTO_INC | LP5523_PWR_SAVE |
138                             LP5523_CP_AUTO | LP5523_AUTO_CLK |
139                             LP5523_PWM_PWR_SAVE);
140         if (ret)
141                 return ret;
142
143         /* turn on all leds */
144         ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
145         if (ret)
146                 return ret;
147
148         ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
149         if (ret)
150                 return ret;
151
152         return lp5523_init_program_engine(chip);
153 }
154
155 static void lp5523_load_engine(struct lp55xx_chip *chip)
156 {
157         enum lp55xx_engine_index idx = chip->engine_idx;
158         static const u8 mask[] = {
159                 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M,
160                 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M,
161                 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M,
162         };
163
164         static const u8 val[] = {
165                 [LP55XX_ENGINE_1] = LP5523_LOAD_ENG1,
166                 [LP55XX_ENGINE_2] = LP5523_LOAD_ENG2,
167                 [LP55XX_ENGINE_3] = LP5523_LOAD_ENG3,
168         };
169
170         lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], val[idx]);
171
172         lp5523_wait_opmode_done();
173 }
174
175 static void lp5523_load_engine_and_select_page(struct lp55xx_chip *chip)
176 {
177         enum lp55xx_engine_index idx = chip->engine_idx;
178         static const u8 page_sel[] = {
179                 [LP55XX_ENGINE_1] = LP5523_PAGE_ENG1,
180                 [LP55XX_ENGINE_2] = LP5523_PAGE_ENG2,
181                 [LP55XX_ENGINE_3] = LP5523_PAGE_ENG3,
182         };
183
184         lp5523_load_engine(chip);
185
186         lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, page_sel[idx]);
187 }
188
189 static void lp5523_stop_all_engines(struct lp55xx_chip *chip)
190 {
191         lp55xx_write(chip, LP5523_REG_OP_MODE, 0);
192         lp5523_wait_opmode_done();
193 }
194
195 static void lp5523_stop_engine(struct lp55xx_chip *chip)
196 {
197         enum lp55xx_engine_index idx = chip->engine_idx;
198         static const u8 mask[] = {
199                 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M,
200                 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M,
201                 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M,
202         };
203
204         lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], 0);
205
206         lp5523_wait_opmode_done();
207 }
208
209 static void lp5523_turn_off_channels(struct lp55xx_chip *chip)
210 {
211         int i;
212
213         for (i = 0; i < LP5523_MAX_LEDS; i++)
214                 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0);
215 }
216
217 static void lp5523_run_engine(struct lp55xx_chip *chip, bool start)
218 {
219         int ret;
220         u8 mode;
221         u8 exec;
222
223         /* stop engine */
224         if (!start) {
225                 lp5523_stop_engine(chip);
226                 lp5523_turn_off_channels(chip);
227                 return;
228         }
229
230         /*
231          * To run the engine,
232          * operation mode and enable register should updated at the same time
233          */
234
235         ret = lp55xx_read(chip, LP5523_REG_OP_MODE, &mode);
236         if (ret)
237                 return;
238
239         ret = lp55xx_read(chip, LP5523_REG_ENABLE, &exec);
240         if (ret)
241                 return;
242
243         /* change operation mode to RUN only when each engine is loading */
244         if (LP5523_ENG1_IS_LOADING(mode)) {
245                 mode = (mode & ~LP5523_MODE_ENG1_M) | LP5523_RUN_ENG1;
246                 exec = (exec & ~LP5523_EXEC_ENG1_M) | LP5523_RUN_ENG1;
247         }
248
249         if (LP5523_ENG2_IS_LOADING(mode)) {
250                 mode = (mode & ~LP5523_MODE_ENG2_M) | LP5523_RUN_ENG2;
251                 exec = (exec & ~LP5523_EXEC_ENG2_M) | LP5523_RUN_ENG2;
252         }
253
254         if (LP5523_ENG3_IS_LOADING(mode)) {
255                 mode = (mode & ~LP5523_MODE_ENG3_M) | LP5523_RUN_ENG3;
256                 exec = (exec & ~LP5523_EXEC_ENG3_M) | LP5523_RUN_ENG3;
257         }
258
259         lp55xx_write(chip, LP5523_REG_OP_MODE, mode);
260         lp5523_wait_opmode_done();
261
262         lp55xx_update_bits(chip, LP5523_REG_ENABLE, LP5523_EXEC_M, exec);
263 }
264
265 static int lp5523_init_program_engine(struct lp55xx_chip *chip)
266 {
267         int i;
268         int j;
269         int ret;
270         u8 status;
271         /* one pattern per engine setting LED MUX start and stop addresses */
272         static const u8 pattern[][LP5523_PROGRAM_LENGTH] =  {
273                 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
274                 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
275                 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
276         };
277
278         /* hardcode 32 bytes of memory for each engine from program memory */
279         ret = lp55xx_write(chip, LP5523_REG_CH1_PROG_START, 0x00);
280         if (ret)
281                 return ret;
282
283         ret = lp55xx_write(chip, LP5523_REG_CH2_PROG_START, 0x10);
284         if (ret)
285                 return ret;
286
287         ret = lp55xx_write(chip, LP5523_REG_CH3_PROG_START, 0x20);
288         if (ret)
289                 return ret;
290
291         /* write LED MUX address space for each engine */
292         for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) {
293                 chip->engine_idx = i;
294                 lp5523_load_engine_and_select_page(chip);
295
296                 for (j = 0; j < LP5523_PROGRAM_LENGTH; j++) {
297                         ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + j,
298                                         pattern[i - 1][j]);
299                         if (ret)
300                                 goto out;
301                 }
302         }
303
304         lp5523_run_engine(chip, true);
305
306         /* Let the programs run for couple of ms and check the engine status */
307         usleep_range(3000, 6000);
308         ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
309         if (ret)
310                 return ret;
311         status &= LP5523_ENG_STATUS_MASK;
312
313         if (status != LP5523_ENG_STATUS_MASK) {
314                 dev_err(&chip->cl->dev,
315                         "could not configure LED engine, status = 0x%.2x\n",
316                         status);
317                 ret = -1;
318         }
319
320 out:
321         lp5523_stop_all_engines(chip);
322         return ret;
323 }
324
325 static int lp5523_update_program_memory(struct lp55xx_chip *chip,
326                                         const u8 *data, size_t size)
327 {
328         u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
329         unsigned int cmd;
330         char c[3];
331         int nrchars;
332         int ret;
333         int offset = 0;
334         int i = 0;
335
336         while ((offset < size - 1) && (i < LP5523_PROGRAM_LENGTH)) {
337                 /* separate sscanfs because length is working only for %s */
338                 ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
339                 if (ret != 1)
340                         goto err;
341
342                 ret = sscanf(c, "%2x", &cmd);
343                 if (ret != 1)
344                         goto err;
345
346                 pattern[i] = (u8)cmd;
347                 offset += nrchars;
348                 i++;
349         }
350
351         /* Each instruction is 16bit long. Check that length is even */
352         if (i % 2)
353                 goto err;
354
355         for (i = 0; i < LP5523_PROGRAM_LENGTH; i++) {
356                 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + i, pattern[i]);
357                 if (ret)
358                         return -EINVAL;
359         }
360
361         return size;
362
363 err:
364         dev_err(&chip->cl->dev, "wrong pattern format\n");
365         return -EINVAL;
366 }
367
368 static void lp5523_firmware_loaded(struct lp55xx_chip *chip)
369 {
370         const struct firmware *fw = chip->fw;
371
372         if (fw->size > LP5523_PROGRAM_LENGTH) {
373                 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
374                         fw->size);
375                 return;
376         }
377
378         /*
379          * Program memory sequence
380          *  1) set engine mode to "LOAD"
381          *  2) write firmware data into program memory
382          */
383
384         lp5523_load_engine_and_select_page(chip);
385         lp5523_update_program_memory(chip, fw->data, fw->size);
386 }
387
388 static ssize_t show_engine_mode(struct device *dev,
389                                 struct device_attribute *attr,
390                                 char *buf, int nr)
391 {
392         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
393         struct lp55xx_chip *chip = led->chip;
394         enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode;
395
396         switch (mode) {
397         case LP55XX_ENGINE_RUN:
398                 return sprintf(buf, "run\n");
399         case LP55XX_ENGINE_LOAD:
400                 return sprintf(buf, "load\n");
401         case LP55XX_ENGINE_DISABLED:
402         default:
403                 return sprintf(buf, "disabled\n");
404         }
405 }
406 show_mode(1)
407 show_mode(2)
408 show_mode(3)
409
410 static ssize_t store_engine_mode(struct device *dev,
411                                  struct device_attribute *attr,
412                                  const char *buf, size_t len, int nr)
413 {
414         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
415         struct lp55xx_chip *chip = led->chip;
416         struct lp55xx_engine *engine = &chip->engines[nr - 1];
417
418         mutex_lock(&chip->lock);
419
420         chip->engine_idx = nr;
421
422         if (!strncmp(buf, "run", 3)) {
423                 lp5523_run_engine(chip, true);
424                 engine->mode = LP55XX_ENGINE_RUN;
425         } else if (!strncmp(buf, "load", 4)) {
426                 lp5523_stop_engine(chip);
427                 lp5523_load_engine(chip);
428                 engine->mode = LP55XX_ENGINE_LOAD;
429         } else if (!strncmp(buf, "disabled", 8)) {
430                 lp5523_stop_engine(chip);
431                 engine->mode = LP55XX_ENGINE_DISABLED;
432         }
433
434         mutex_unlock(&chip->lock);
435
436         return len;
437 }
438 store_mode(1)
439 store_mode(2)
440 store_mode(3)
441
442 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
443 {
444         u16 tmp_mux = 0;
445         int i;
446
447         len = min_t(int, len, LP5523_MAX_LEDS);
448
449         for (i = 0; i < len; i++) {
450                 switch (buf[i]) {
451                 case '1':
452                         tmp_mux |= (1 << i);
453                         break;
454                 case '0':
455                         break;
456                 case '\n':
457                         i = len;
458                         break;
459                 default:
460                         return -1;
461                 }
462         }
463         *mux = tmp_mux;
464
465         return 0;
466 }
467
468 static void lp5523_mux_to_array(u16 led_mux, char *array)
469 {
470         int i, pos = 0;
471
472         for (i = 0; i < LP5523_MAX_LEDS; i++)
473                 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
474
475         array[pos] = '\0';
476 }
477
478 static ssize_t show_engine_leds(struct device *dev,
479                             struct device_attribute *attr,
480                             char *buf, int nr)
481 {
482         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
483         struct lp55xx_chip *chip = led->chip;
484         char mux[LP5523_MAX_LEDS + 1];
485
486         lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
487
488         return sprintf(buf, "%s\n", mux);
489 }
490 show_leds(1)
491 show_leds(2)
492 show_leds(3)
493
494 static int lp5523_load_mux(struct lp55xx_chip *chip, u16 mux, int nr)
495 {
496         struct lp55xx_engine *engine = &chip->engines[nr - 1];
497         int ret;
498         static const u8 mux_page[] = {
499                 [LP55XX_ENGINE_1] = LP5523_PAGE_MUX1,
500                 [LP55XX_ENGINE_2] = LP5523_PAGE_MUX2,
501                 [LP55XX_ENGINE_3] = LP5523_PAGE_MUX3,
502         };
503
504         lp5523_load_engine(chip);
505
506         ret = lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, mux_page[nr]);
507         if (ret)
508                 return ret;
509
510         ret = lp55xx_write(chip, LP5523_REG_PROG_MEM, (u8)(mux >> 8));
511         if (ret)
512                 return ret;
513
514         ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + 1, (u8)(mux));
515         if (ret)
516                 return ret;
517
518         engine->led_mux = mux;
519         return 0;
520 }
521
522 static ssize_t store_engine_leds(struct device *dev,
523                              struct device_attribute *attr,
524                              const char *buf, size_t len, int nr)
525 {
526         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
527         struct lp55xx_chip *chip = led->chip;
528         struct lp55xx_engine *engine = &chip->engines[nr - 1];
529         u16 mux = 0;
530         ssize_t ret;
531
532         if (lp5523_mux_parse(buf, &mux, len))
533                 return -EINVAL;
534
535         mutex_lock(&chip->lock);
536
537         chip->engine_idx = nr;
538         ret = -EINVAL;
539
540         if (engine->mode != LP55XX_ENGINE_LOAD)
541                 goto leave;
542
543         if (lp5523_load_mux(chip, mux, nr))
544                 goto leave;
545
546         ret = len;
547 leave:
548         mutex_unlock(&chip->lock);
549         return ret;
550 }
551 store_leds(1)
552 store_leds(2)
553 store_leds(3)
554
555 static ssize_t store_engine_load(struct device *dev,
556                              struct device_attribute *attr,
557                              const char *buf, size_t len, int nr)
558 {
559         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
560         struct lp55xx_chip *chip = led->chip;
561         int ret;
562
563         mutex_lock(&chip->lock);
564
565         chip->engine_idx = nr;
566         lp5523_load_engine_and_select_page(chip);
567         ret = lp5523_update_program_memory(chip, buf, len);
568
569         mutex_unlock(&chip->lock);
570
571         return ret;
572 }
573 store_load(1)
574 store_load(2)
575 store_load(3)
576
577 static ssize_t lp5523_selftest(struct device *dev,
578                                struct device_attribute *attr,
579                                char *buf)
580 {
581         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
582         struct lp55xx_chip *chip = led->chip;
583         struct lp55xx_platform_data *pdata = chip->pdata;
584         int i, ret, pos = 0;
585         u8 status, adc, vdd;
586
587         mutex_lock(&chip->lock);
588
589         ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
590         if (ret < 0)
591                 goto fail;
592
593         /* Check that ext clock is really in use if requested */
594         if (pdata->clock_mode == LP55XX_CLOCK_EXT) {
595                 if  ((status & LP5523_EXT_CLK_USED) == 0)
596                         goto fail;
597         }
598
599         /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
600         lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, LP5523_EN_LEDTEST | 16);
601         usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
602         ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
603         if (ret < 0)
604                 goto fail;
605
606         if (!(status & LP5523_LEDTEST_DONE))
607                 usleep_range(3000, 6000); /* Was not ready. Wait little bit */
608
609         ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &vdd);
610         if (ret < 0)
611                 goto fail;
612
613         vdd--;  /* There may be some fluctuation in measurement */
614
615         for (i = 0; i < LP5523_MAX_LEDS; i++) {
616                 /* Skip non-existing channels */
617                 if (pdata->led_config[i].led_current == 0)
618                         continue;
619
620                 /* Set default current */
621                 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i,
622                         pdata->led_config[i].led_current);
623
624                 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0xff);
625                 /* let current stabilize 2 - 4ms before measurements start */
626                 usleep_range(2000, 4000);
627                 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL,
628                              LP5523_EN_LEDTEST | i);
629                 /* ADC conversion time is 2.7 ms typically */
630                 usleep_range(3000, 6000);
631                 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
632                 if (ret < 0)
633                         goto fail;
634
635                 if (!(status & LP5523_LEDTEST_DONE))
636                         usleep_range(3000, 6000);/* Was not ready. Wait. */
637
638                 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &adc);
639                 if (ret < 0)
640                         goto fail;
641
642                 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
643                         pos += sprintf(buf + pos, "LED %d FAIL\n", i);
644
645                 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0x00);
646
647                 /* Restore current */
648                 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i,
649                         led->led_current);
650                 led++;
651         }
652         if (pos == 0)
653                 pos = sprintf(buf, "OK\n");
654         goto release_lock;
655 fail:
656         pos = sprintf(buf, "FAIL\n");
657
658 release_lock:
659         mutex_unlock(&chip->lock);
660
661         return pos;
662 }
663
664 #define show_fader(nr)                                          \
665 static ssize_t show_master_fader##nr(struct device *dev,        \
666                             struct device_attribute *attr,      \
667                             char *buf)                          \
668 {                                                               \
669         return show_master_fader(dev, attr, buf, nr);           \
670 }
671
672 #define store_fader(nr)                                         \
673 static ssize_t store_master_fader##nr(struct device *dev,       \
674                              struct device_attribute *attr,     \
675                              const char *buf, size_t len)       \
676 {                                                               \
677         return store_master_fader(dev, attr, buf, len, nr);     \
678 }
679
680 static ssize_t show_master_fader(struct device *dev,
681                                  struct device_attribute *attr,
682                                  char *buf, int nr)
683 {
684         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
685         struct lp55xx_chip *chip = led->chip;
686         int ret;
687         u8 val;
688
689         mutex_lock(&chip->lock);
690         ret = lp55xx_read(chip, LP5523_REG_MASTER_FADER_BASE + nr - 1, &val);
691         mutex_unlock(&chip->lock);
692
693         if (ret == 0)
694                 ret = sprintf(buf, "%u\n", val);
695
696         return ret;
697 }
698 show_fader(1)
699 show_fader(2)
700 show_fader(3)
701
702 static ssize_t store_master_fader(struct device *dev,
703                                   struct device_attribute *attr,
704                                   const char *buf, size_t len, int nr)
705 {
706         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
707         struct lp55xx_chip *chip = led->chip;
708         int ret;
709         unsigned long val;
710
711         if (kstrtoul(buf, 0, &val))
712                 return -EINVAL;
713
714         if (val > 0xff)
715                 return -EINVAL;
716
717         mutex_lock(&chip->lock);
718         ret = lp55xx_write(chip, LP5523_REG_MASTER_FADER_BASE + nr - 1,
719                            (u8)val);
720         mutex_unlock(&chip->lock);
721
722         if (ret == 0)
723                 ret = len;
724
725         return ret;
726 }
727 store_fader(1)
728 store_fader(2)
729 store_fader(3)
730
731 static ssize_t show_master_fader_leds(struct device *dev,
732                                       struct device_attribute *attr,
733                                       char *buf)
734 {
735         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
736         struct lp55xx_chip *chip = led->chip;
737         int i, ret, pos = 0;
738         u8 val;
739
740         mutex_lock(&chip->lock);
741
742         for (i = 0; i < LP5523_MAX_LEDS; i++) {
743                 ret = lp55xx_read(chip, LP5523_REG_LED_CTRL_BASE + i, &val);
744                 if (ret)
745                         goto leave;
746
747                 val = (val & LP5523_FADER_MAPPING_MASK)
748                         >> LP5523_FADER_MAPPING_SHIFT;
749                 if (val > 3) {
750                         ret = -EINVAL;
751                         goto leave;
752                 }
753                 buf[pos++] = val + '0';
754         }
755         buf[pos++] = '\n';
756         ret = pos;
757 leave:
758         mutex_unlock(&chip->lock);
759         return ret;
760 }
761
762 static ssize_t store_master_fader_leds(struct device *dev,
763                                        struct device_attribute *attr,
764                                        const char *buf, size_t len)
765 {
766         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
767         struct lp55xx_chip *chip = led->chip;
768         int i, n, ret;
769         u8 val;
770
771         n = min_t(int, len, LP5523_MAX_LEDS);
772
773         mutex_lock(&chip->lock);
774
775         for (i = 0; i < n; i++) {
776                 if (buf[i] >= '0' && buf[i] <= '3') {
777                         val = (buf[i] - '0') << LP5523_FADER_MAPPING_SHIFT;
778                         ret = lp55xx_update_bits(chip,
779                                                  LP5523_REG_LED_CTRL_BASE + i,
780                                                  LP5523_FADER_MAPPING_MASK,
781                                                  val);
782                         if (ret)
783                                 goto leave;
784                 } else {
785                         ret = -EINVAL;
786                         goto leave;
787                 }
788         }
789         ret = len;
790 leave:
791         mutex_unlock(&chip->lock);
792         return ret;
793 }
794
795 static int lp5523_multicolor_brightness(struct lp55xx_led *led)
796 {
797         struct lp55xx_chip *chip = led->chip;
798         int ret;
799         int i;
800
801         mutex_lock(&chip->lock);
802         for (i = 0; i < led->mc_cdev.num_colors; i++) {
803                 ret = lp55xx_write(chip,
804                                    LP5523_REG_LED_PWM_BASE +
805                                    led->mc_cdev.subled_info[i].channel,
806                                    led->mc_cdev.subled_info[i].brightness);
807                 if (ret)
808                         break;
809         }
810         mutex_unlock(&chip->lock);
811         return ret;
812 }
813
814 static int lp5523_led_brightness(struct lp55xx_led *led)
815 {
816         struct lp55xx_chip *chip = led->chip;
817         int ret;
818
819         mutex_lock(&chip->lock);
820         ret = lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr,
821                      led->brightness);
822         mutex_unlock(&chip->lock);
823         return ret;
824 }
825
826 static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode);
827 static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode);
828 static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode);
829 static LP55XX_DEV_ATTR_RW(engine1_leds, show_engine1_leds, store_engine1_leds);
830 static LP55XX_DEV_ATTR_RW(engine2_leds, show_engine2_leds, store_engine2_leds);
831 static LP55XX_DEV_ATTR_RW(engine3_leds, show_engine3_leds, store_engine3_leds);
832 static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load);
833 static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load);
834 static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load);
835 static LP55XX_DEV_ATTR_RO(selftest, lp5523_selftest);
836 static LP55XX_DEV_ATTR_RW(master_fader1, show_master_fader1,
837                           store_master_fader1);
838 static LP55XX_DEV_ATTR_RW(master_fader2, show_master_fader2,
839                           store_master_fader2);
840 static LP55XX_DEV_ATTR_RW(master_fader3, show_master_fader3,
841                           store_master_fader3);
842 static LP55XX_DEV_ATTR_RW(master_fader_leds, show_master_fader_leds,
843                           store_master_fader_leds);
844
845 static struct attribute *lp5523_attributes[] = {
846         &dev_attr_engine1_mode.attr,
847         &dev_attr_engine2_mode.attr,
848         &dev_attr_engine3_mode.attr,
849         &dev_attr_engine1_load.attr,
850         &dev_attr_engine2_load.attr,
851         &dev_attr_engine3_load.attr,
852         &dev_attr_engine1_leds.attr,
853         &dev_attr_engine2_leds.attr,
854         &dev_attr_engine3_leds.attr,
855         &dev_attr_selftest.attr,
856         &dev_attr_master_fader1.attr,
857         &dev_attr_master_fader2.attr,
858         &dev_attr_master_fader3.attr,
859         &dev_attr_master_fader_leds.attr,
860         NULL,
861 };
862
863 static const struct attribute_group lp5523_group = {
864         .attrs = lp5523_attributes,
865 };
866
867 /* Chip specific configurations */
868 static struct lp55xx_device_config lp5523_cfg = {
869         .reset = {
870                 .addr = LP5523_REG_RESET,
871                 .val  = LP5523_RESET,
872         },
873         .enable = {
874                 .addr = LP5523_REG_ENABLE,
875                 .val  = LP5523_ENABLE,
876         },
877         .max_channel  = LP5523_MAX_LEDS,
878         .post_init_device   = lp5523_post_init_device,
879         .brightness_fn      = lp5523_led_brightness,
880         .multicolor_brightness_fn = lp5523_multicolor_brightness,
881         .set_led_current    = lp5523_set_led_current,
882         .firmware_cb        = lp5523_firmware_loaded,
883         .run_engine         = lp5523_run_engine,
884         .dev_attr_group     = &lp5523_group,
885 };
886
887 static int lp5523_probe(struct i2c_client *client,
888                         const struct i2c_device_id *id)
889 {
890         int ret;
891         struct lp55xx_chip *chip;
892         struct lp55xx_led *led;
893         struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev);
894         struct device_node *np = dev_of_node(&client->dev);
895
896         chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
897         if (!chip)
898                 return -ENOMEM;
899
900         chip->cfg = &lp5523_cfg;
901
902         if (!pdata) {
903                 if (np) {
904                         pdata = lp55xx_of_populate_pdata(&client->dev, np,
905                                                          chip);
906                         if (IS_ERR(pdata))
907                                 return PTR_ERR(pdata);
908                 } else {
909                         dev_err(&client->dev, "no platform data\n");
910                         return -EINVAL;
911                 }
912         }
913
914         led = devm_kcalloc(&client->dev,
915                         pdata->num_channels, sizeof(*led), GFP_KERNEL);
916         if (!led)
917                 return -ENOMEM;
918
919         chip->cl = client;
920         chip->pdata = pdata;
921
922         mutex_init(&chip->lock);
923
924         i2c_set_clientdata(client, led);
925
926         ret = lp55xx_init_device(chip);
927         if (ret)
928                 goto err_init;
929
930         dev_info(&client->dev, "%s Programmable led chip found\n", id->name);
931
932         ret = lp55xx_register_leds(led, chip);
933         if (ret)
934                 goto err_out;
935
936         ret = lp55xx_register_sysfs(chip);
937         if (ret) {
938                 dev_err(&client->dev, "registering sysfs failed\n");
939                 goto err_out;
940         }
941
942         return 0;
943
944 err_out:
945         lp55xx_deinit_device(chip);
946 err_init:
947         return ret;
948 }
949
950 static int lp5523_remove(struct i2c_client *client)
951 {
952         struct lp55xx_led *led = i2c_get_clientdata(client);
953         struct lp55xx_chip *chip = led->chip;
954
955         lp5523_stop_all_engines(chip);
956         lp55xx_unregister_sysfs(chip);
957         lp55xx_deinit_device(chip);
958
959         return 0;
960 }
961
962 static const struct i2c_device_id lp5523_id[] = {
963         { "lp5523",  LP5523 },
964         { "lp55231", LP55231 },
965         { }
966 };
967
968 MODULE_DEVICE_TABLE(i2c, lp5523_id);
969
970 #ifdef CONFIG_OF
971 static const struct of_device_id of_lp5523_leds_match[] = {
972         { .compatible = "national,lp5523", },
973         { .compatible = "ti,lp55231", },
974         {},
975 };
976
977 MODULE_DEVICE_TABLE(of, of_lp5523_leds_match);
978 #endif
979
980 static struct i2c_driver lp5523_driver = {
981         .driver = {
982                 .name   = "lp5523x",
983                 .of_match_table = of_match_ptr(of_lp5523_leds_match),
984         },
985         .probe          = lp5523_probe,
986         .remove         = lp5523_remove,
987         .id_table       = lp5523_id,
988 };
989
990 module_i2c_driver(lp5523_driver);
991
992 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
993 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
994 MODULE_DESCRIPTION("LP5523 LED engine");
995 MODULE_LICENSE("GPL");