Version:  2.0.40 2.2.26 2.4.37 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2

Linux/drivers/leds/leds-lp5523.c

  1 /*
  2  * lp5523.c - LP5523, LP55231 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/leds.h>
 29 #include <linux/module.h>
 30 #include <linux/mutex.h>
 31 #include <linux/of.h>
 32 #include <linux/platform_data/leds-lp55xx.h>
 33 #include <linux/slab.h>
 34 
 35 #include "leds-lp55xx-common.h"
 36 
 37 #define LP5523_PROGRAM_LENGTH           32      /* bytes */
 38 /* Memory is used like this:
 39    0x00 engine 1 program
 40    0x10 engine 2 program
 41    0x20 engine 3 program
 42    0x30 engine 1 muxing info
 43    0x40 engine 2 muxing info
 44    0x50 engine 3 muxing info
 45 */
 46 #define LP5523_MAX_LEDS                 9
 47 
 48 /* Registers */
 49 #define LP5523_REG_ENABLE               0x00
 50 #define LP5523_REG_OP_MODE              0x01
 51 #define LP5523_REG_ENABLE_LEDS_MSB      0x04
 52 #define LP5523_REG_ENABLE_LEDS_LSB      0x05
 53 #define LP5523_REG_LED_CTRL_BASE        0x06
 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_MASTER_FADER_BASE    0x48
 62 #define LP5523_REG_CH1_PROG_START       0x4C
 63 #define LP5523_REG_CH2_PROG_START       0x4D
 64 #define LP5523_REG_CH3_PROG_START       0x4E
 65 #define LP5523_REG_PROG_PAGE_SEL        0x4F
 66 #define LP5523_REG_PROG_MEM             0x50
 67 
 68 /* Bit description in registers */
 69 #define LP5523_ENABLE                   0x40
 70 #define LP5523_AUTO_INC                 0x40
 71 #define LP5523_PWR_SAVE                 0x20
 72 #define LP5523_PWM_PWR_SAVE             0x04
 73 #define LP5523_CP_AUTO                  0x18
 74 #define LP5523_AUTO_CLK                 0x02
 75 
 76 #define LP5523_EN_LEDTEST               0x80
 77 #define LP5523_LEDTEST_DONE             0x80
 78 #define LP5523_RESET                    0xFF
 79 #define LP5523_ADC_SHORTCIRC_LIM        80
 80 #define LP5523_EXT_CLK_USED             0x08
 81 #define LP5523_ENG_STATUS_MASK          0x07
 82 
 83 #define LP5523_FADER_MAPPING_MASK       0xC0
 84 #define LP5523_FADER_MAPPING_SHIFT      6
 85 
 86 /* Memory Page Selection */
 87 #define LP5523_PAGE_ENG1                0
 88 #define LP5523_PAGE_ENG2                1
 89 #define LP5523_PAGE_ENG3                2
 90 #define LP5523_PAGE_MUX1                3
 91 #define LP5523_PAGE_MUX2                4
 92 #define LP5523_PAGE_MUX3                5
 93 
 94 /* Program Memory Operations */
 95 #define LP5523_MODE_ENG1_M              0x30    /* Operation Mode Register */
 96 #define LP5523_MODE_ENG2_M              0x0C
 97 #define LP5523_MODE_ENG3_M              0x03
 98 #define LP5523_LOAD_ENG1                0x10
 99 #define LP5523_LOAD_ENG2                0x04
100 #define LP5523_LOAD_ENG3                0x01
101 
102 #define LP5523_ENG1_IS_LOADING(mode)    \
103         ((mode & LP5523_MODE_ENG1_M) == LP5523_LOAD_ENG1)
104 #define LP5523_ENG2_IS_LOADING(mode)    \
105         ((mode & LP5523_MODE_ENG2_M) == LP5523_LOAD_ENG2)
106 #define LP5523_ENG3_IS_LOADING(mode)    \
107         ((mode & LP5523_MODE_ENG3_M) == LP5523_LOAD_ENG3)
108 
109 #define LP5523_EXEC_ENG1_M              0x30    /* Enable Register */
110 #define LP5523_EXEC_ENG2_M              0x0C
111 #define LP5523_EXEC_ENG3_M              0x03
112 #define LP5523_EXEC_M                   0x3F
113 #define LP5523_RUN_ENG1                 0x20
114 #define LP5523_RUN_ENG2                 0x08
115 #define LP5523_RUN_ENG3                 0x02
116 
117 #define LED_ACTIVE(mux, led)            (!!(mux & (0x0001 << led)))
118 
119 enum lp5523_chip_id {
120         LP5523,
121         LP55231,
122 };
123 
124 static int lp5523_init_program_engine(struct lp55xx_chip *chip);
125 
126 static inline void lp5523_wait_opmode_done(void)
127 {
128         usleep_range(1000, 2000);
129 }
130 
131 static void lp5523_set_led_current(struct lp55xx_led *led, u8 led_current)
132 {
133         led->led_current = led_current;
134         lp55xx_write(led->chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
135                 led_current);
136 }
137 
138 static int lp5523_post_init_device(struct lp55xx_chip *chip)
139 {
140         int ret;
141 
142         ret = lp55xx_write(chip, LP5523_REG_ENABLE, LP5523_ENABLE);
143         if (ret)
144                 return ret;
145 
146         /* Chip startup time is 500 us, 1 - 2 ms gives some margin */
147         usleep_range(1000, 2000);
148 
149         ret = lp55xx_write(chip, LP5523_REG_CONFIG,
150                             LP5523_AUTO_INC | LP5523_PWR_SAVE |
151                             LP5523_CP_AUTO | LP5523_AUTO_CLK |
152                             LP5523_PWM_PWR_SAVE);
153         if (ret)
154                 return ret;
155 
156         /* turn on all leds */
157         ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
158         if (ret)
159                 return ret;
160 
161         ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
162         if (ret)
163                 return ret;
164 
165         return lp5523_init_program_engine(chip);
166 }
167 
168 static void lp5523_load_engine(struct lp55xx_chip *chip)
169 {
170         enum lp55xx_engine_index idx = chip->engine_idx;
171         u8 mask[] = {
172                 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M,
173                 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M,
174                 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M,
175         };
176 
177         u8 val[] = {
178                 [LP55XX_ENGINE_1] = LP5523_LOAD_ENG1,
179                 [LP55XX_ENGINE_2] = LP5523_LOAD_ENG2,
180                 [LP55XX_ENGINE_3] = LP5523_LOAD_ENG3,
181         };
182 
183         lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], val[idx]);
184 
185         lp5523_wait_opmode_done();
186 }
187 
188 static void lp5523_load_engine_and_select_page(struct lp55xx_chip *chip)
189 {
190         enum lp55xx_engine_index idx = chip->engine_idx;
191         u8 page_sel[] = {
192                 [LP55XX_ENGINE_1] = LP5523_PAGE_ENG1,
193                 [LP55XX_ENGINE_2] = LP5523_PAGE_ENG2,
194                 [LP55XX_ENGINE_3] = LP5523_PAGE_ENG3,
195         };
196 
197         lp5523_load_engine(chip);
198 
199         lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, page_sel[idx]);
200 }
201 
202 static void lp5523_stop_all_engines(struct lp55xx_chip *chip)
203 {
204         lp55xx_write(chip, LP5523_REG_OP_MODE, 0);
205         lp5523_wait_opmode_done();
206 }
207 
208 static void lp5523_stop_engine(struct lp55xx_chip *chip)
209 {
210         enum lp55xx_engine_index idx = chip->engine_idx;
211         u8 mask[] = {
212                 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M,
213                 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M,
214                 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M,
215         };
216 
217         lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], 0);
218 
219         lp5523_wait_opmode_done();
220 }
221 
222 static void lp5523_turn_off_channels(struct lp55xx_chip *chip)
223 {
224         int i;
225 
226         for (i = 0; i < LP5523_MAX_LEDS; i++)
227                 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0);
228 }
229 
230 static void lp5523_run_engine(struct lp55xx_chip *chip, bool start)
231 {
232         int ret;
233         u8 mode;
234         u8 exec;
235 
236         /* stop engine */
237         if (!start) {
238                 lp5523_stop_engine(chip);
239                 lp5523_turn_off_channels(chip);
240                 return;
241         }
242 
243         /*
244          * To run the engine,
245          * operation mode and enable register should updated at the same time
246          */
247 
248         ret = lp55xx_read(chip, LP5523_REG_OP_MODE, &mode);
249         if (ret)
250                 return;
251 
252         ret = lp55xx_read(chip, LP5523_REG_ENABLE, &exec);
253         if (ret)
254                 return;
255 
256         /* change operation mode to RUN only when each engine is loading */
257         if (LP5523_ENG1_IS_LOADING(mode)) {
258                 mode = (mode & ~LP5523_MODE_ENG1_M) | LP5523_RUN_ENG1;
259                 exec = (exec & ~LP5523_EXEC_ENG1_M) | LP5523_RUN_ENG1;
260         }
261 
262         if (LP5523_ENG2_IS_LOADING(mode)) {
263                 mode = (mode & ~LP5523_MODE_ENG2_M) | LP5523_RUN_ENG2;
264                 exec = (exec & ~LP5523_EXEC_ENG2_M) | LP5523_RUN_ENG2;
265         }
266 
267         if (LP5523_ENG3_IS_LOADING(mode)) {
268                 mode = (mode & ~LP5523_MODE_ENG3_M) | LP5523_RUN_ENG3;
269                 exec = (exec & ~LP5523_EXEC_ENG3_M) | LP5523_RUN_ENG3;
270         }
271 
272         lp55xx_write(chip, LP5523_REG_OP_MODE, mode);
273         lp5523_wait_opmode_done();
274 
275         lp55xx_update_bits(chip, LP5523_REG_ENABLE, LP5523_EXEC_M, exec);
276 }
277 
278 static int lp5523_init_program_engine(struct lp55xx_chip *chip)
279 {
280         int i;
281         int j;
282         int ret;
283         u8 status;
284         /* one pattern per engine setting LED MUX start and stop addresses */
285         static const u8 pattern[][LP5523_PROGRAM_LENGTH] =  {
286                 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
287                 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
288                 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
289         };
290 
291         /* hardcode 32 bytes of memory for each engine from program memory */
292         ret = lp55xx_write(chip, LP5523_REG_CH1_PROG_START, 0x00);
293         if (ret)
294                 return ret;
295 
296         ret = lp55xx_write(chip, LP5523_REG_CH2_PROG_START, 0x10);
297         if (ret)
298                 return ret;
299 
300         ret = lp55xx_write(chip, LP5523_REG_CH3_PROG_START, 0x20);
301         if (ret)
302                 return ret;
303 
304         /* write LED MUX address space for each engine */
305         for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) {
306                 chip->engine_idx = i;
307                 lp5523_load_engine_and_select_page(chip);
308 
309                 for (j = 0; j < LP5523_PROGRAM_LENGTH; j++) {
310                         ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + j,
311                                         pattern[i - 1][j]);
312                         if (ret)
313                                 goto out;
314                 }
315         }
316 
317         lp5523_run_engine(chip, true);
318 
319         /* Let the programs run for couple of ms and check the engine status */
320         usleep_range(3000, 6000);
321         lp55xx_read(chip, LP5523_REG_STATUS, &status);
322         status &= LP5523_ENG_STATUS_MASK;
323 
324         if (status != LP5523_ENG_STATUS_MASK) {
325                 dev_err(&chip->cl->dev,
326                         "cound not configure LED engine, status = 0x%.2x\n",
327                         status);
328                 ret = -1;
329         }
330 
331 out:
332         lp5523_stop_all_engines(chip);
333         return ret;
334 }
335 
336 static int lp5523_update_program_memory(struct lp55xx_chip *chip,
337                                         const u8 *data, size_t size)
338 {
339         u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
340         unsigned cmd;
341         char c[3];
342         int nrchars;
343         int ret;
344         int offset = 0;
345         int i = 0;
346 
347         while ((offset < size - 1) && (i < LP5523_PROGRAM_LENGTH)) {
348                 /* separate sscanfs because length is working only for %s */
349                 ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
350                 if (ret != 1)
351                         goto err;
352 
353                 ret = sscanf(c, "%2x", &cmd);
354                 if (ret != 1)
355                         goto err;
356 
357                 pattern[i] = (u8)cmd;
358                 offset += nrchars;
359                 i++;
360         }
361 
362         /* Each instruction is 16bit long. Check that length is even */
363         if (i % 2)
364                 goto err;
365 
366         for (i = 0; i < LP5523_PROGRAM_LENGTH; i++) {
367                 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + i, pattern[i]);
368                 if (ret)
369                         return -EINVAL;
370         }
371 
372         return size;
373 
374 err:
375         dev_err(&chip->cl->dev, "wrong pattern format\n");
376         return -EINVAL;
377 }
378 
379 static void lp5523_firmware_loaded(struct lp55xx_chip *chip)
380 {
381         const struct firmware *fw = chip->fw;
382 
383         if (fw->size > LP5523_PROGRAM_LENGTH) {
384                 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
385                         fw->size);
386                 return;
387         }
388 
389         /*
390          * Program momery sequence
391          *  1) set engine mode to "LOAD"
392          *  2) write firmware data into program memory
393          */
394 
395         lp5523_load_engine_and_select_page(chip);
396         lp5523_update_program_memory(chip, fw->data, fw->size);
397 }
398 
399 static ssize_t show_engine_mode(struct device *dev,
400                                 struct device_attribute *attr,
401                                 char *buf, int nr)
402 {
403         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
404         struct lp55xx_chip *chip = led->chip;
405         enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode;
406 
407         switch (mode) {
408         case LP55XX_ENGINE_RUN:
409                 return sprintf(buf, "run\n");
410         case LP55XX_ENGINE_LOAD:
411                 return sprintf(buf, "load\n");
412         case LP55XX_ENGINE_DISABLED:
413         default:
414                 return sprintf(buf, "disabled\n");
415         }
416 }
417 show_mode(1)
418 show_mode(2)
419 show_mode(3)
420 
421 static ssize_t store_engine_mode(struct device *dev,
422                                  struct device_attribute *attr,
423                                  const char *buf, size_t len, int nr)
424 {
425         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
426         struct lp55xx_chip *chip = led->chip;
427         struct lp55xx_engine *engine = &chip->engines[nr - 1];
428 
429         mutex_lock(&chip->lock);
430 
431         chip->engine_idx = nr;
432 
433         if (!strncmp(buf, "run", 3)) {
434                 lp5523_run_engine(chip, true);
435                 engine->mode = LP55XX_ENGINE_RUN;
436         } else if (!strncmp(buf, "load", 4)) {
437                 lp5523_stop_engine(chip);
438                 lp5523_load_engine(chip);
439                 engine->mode = LP55XX_ENGINE_LOAD;
440         } else if (!strncmp(buf, "disabled", 8)) {
441                 lp5523_stop_engine(chip);
442                 engine->mode = LP55XX_ENGINE_DISABLED;
443         }
444 
445         mutex_unlock(&chip->lock);
446 
447         return len;
448 }
449 store_mode(1)
450 store_mode(2)
451 store_mode(3)
452 
453 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
454 {
455         u16 tmp_mux = 0;
456         int i;
457 
458         len = min_t(int, len, LP5523_MAX_LEDS);
459 
460         for (i = 0; i < len; i++) {
461                 switch (buf[i]) {
462                 case '1':
463                         tmp_mux |= (1 << i);
464                         break;
465                 case '':
466                         break;
467                 case '\n':
468                         i = len;
469                         break;
470                 default:
471                         return -1;
472                 }
473         }
474         *mux = tmp_mux;
475 
476         return 0;
477 }
478 
479 static void lp5523_mux_to_array(u16 led_mux, char *array)
480 {
481         int i, pos = 0;
482         for (i = 0; i < LP5523_MAX_LEDS; i++)
483                 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
484 
485         array[pos] = '\0';
486 }
487 
488 static ssize_t show_engine_leds(struct device *dev,
489                             struct device_attribute *attr,
490                             char *buf, int nr)
491 {
492         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
493         struct lp55xx_chip *chip = led->chip;
494         char mux[LP5523_MAX_LEDS + 1];
495 
496         lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
497 
498         return sprintf(buf, "%s\n", mux);
499 }
500 show_leds(1)
501 show_leds(2)
502 show_leds(3)
503 
504 static int lp5523_load_mux(struct lp55xx_chip *chip, u16 mux, int nr)
505 {
506         struct lp55xx_engine *engine = &chip->engines[nr - 1];
507         int ret;
508         u8 mux_page[] = {
509                 [LP55XX_ENGINE_1] = LP5523_PAGE_MUX1,
510                 [LP55XX_ENGINE_2] = LP5523_PAGE_MUX2,
511                 [LP55XX_ENGINE_3] = LP5523_PAGE_MUX3,
512         };
513 
514         lp5523_load_engine(chip);
515 
516         ret = lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, mux_page[nr]);
517         if (ret)
518                 return ret;
519 
520         ret = lp55xx_write(chip, LP5523_REG_PROG_MEM , (u8)(mux >> 8));
521         if (ret)
522                 return ret;
523 
524         ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + 1, (u8)(mux));
525         if (ret)
526                 return ret;
527 
528         engine->led_mux = mux;
529         return 0;
530 }
531 
532 static ssize_t store_engine_leds(struct device *dev,
533                              struct device_attribute *attr,
534                              const char *buf, size_t len, int nr)
535 {
536         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
537         struct lp55xx_chip *chip = led->chip;
538         struct lp55xx_engine *engine = &chip->engines[nr - 1];
539         u16 mux = 0;
540         ssize_t ret;
541 
542         if (lp5523_mux_parse(buf, &mux, len))
543                 return -EINVAL;
544 
545         mutex_lock(&chip->lock);
546 
547         chip->engine_idx = nr;
548         ret = -EINVAL;
549 
550         if (engine->mode != LP55XX_ENGINE_LOAD)
551                 goto leave;
552 
553         if (lp5523_load_mux(chip, mux, nr))
554                 goto leave;
555 
556         ret = len;
557 leave:
558         mutex_unlock(&chip->lock);
559         return ret;
560 }
561 store_leds(1)
562 store_leds(2)
563 store_leds(3)
564 
565 static ssize_t store_engine_load(struct device *dev,
566                              struct device_attribute *attr,
567                              const char *buf, size_t len, int nr)
568 {
569         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
570         struct lp55xx_chip *chip = led->chip;
571         int ret;
572 
573         mutex_lock(&chip->lock);
574 
575         chip->engine_idx = nr;
576         lp5523_load_engine_and_select_page(chip);
577         ret = lp5523_update_program_memory(chip, buf, len);
578 
579         mutex_unlock(&chip->lock);
580 
581         return ret;
582 }
583 store_load(1)
584 store_load(2)
585 store_load(3)
586 
587 static ssize_t lp5523_selftest(struct device *dev,
588                                struct device_attribute *attr,
589                                char *buf)
590 {
591         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
592         struct lp55xx_chip *chip = led->chip;
593         struct lp55xx_platform_data *pdata = chip->pdata;
594         int i, ret, pos = 0;
595         u8 status, adc, vdd;
596 
597         mutex_lock(&chip->lock);
598 
599         ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
600         if (ret < 0)
601                 goto fail;
602 
603         /* Check that ext clock is really in use if requested */
604         if (pdata->clock_mode == LP55XX_CLOCK_EXT) {
605                 if  ((status & LP5523_EXT_CLK_USED) == 0)
606                         goto fail;
607         }
608 
609         /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
610         lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, LP5523_EN_LEDTEST | 16);
611         usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
612         ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
613         if (ret < 0)
614                 goto fail;
615 
616         if (!(status & LP5523_LEDTEST_DONE))
617                 usleep_range(3000, 6000); /* Was not ready. Wait little bit */
618 
619         ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &vdd);
620         if (ret < 0)
621                 goto fail;
622 
623         vdd--;  /* There may be some fluctuation in measurement */
624 
625         for (i = 0; i < LP5523_MAX_LEDS; i++) {
626                 /* Skip non-existing channels */
627                 if (pdata->led_config[i].led_current == 0)
628                         continue;
629 
630                 /* Set default current */
631                 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i,
632                         pdata->led_config[i].led_current);
633 
634                 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0xff);
635                 /* let current stabilize 2 - 4ms before measurements start */
636                 usleep_range(2000, 4000);
637                 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL,
638                              LP5523_EN_LEDTEST | i);
639                 /* ADC conversion time is 2.7 ms typically */
640                 usleep_range(3000, 6000);
641                 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
642                 if (ret < 0)
643                         goto fail;
644 
645                 if (!(status & LP5523_LEDTEST_DONE))
646                         usleep_range(3000, 6000);/* Was not ready. Wait. */
647 
648                 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &adc);
649                 if (ret < 0)
650                         goto fail;
651 
652                 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
653                         pos += sprintf(buf + pos, "LED %d FAIL\n", i);
654 
655                 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0x00);
656 
657                 /* Restore current */
658                 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i,
659                         led->led_current);
660                 led++;
661         }
662         if (pos == 0)
663                 pos = sprintf(buf, "OK\n");
664         goto release_lock;
665 fail:
666         pos = sprintf(buf, "FAIL\n");
667 
668 release_lock:
669         mutex_unlock(&chip->lock);
670 
671         return pos;
672 }
673 
674 #define show_fader(nr)                                          \
675 static ssize_t show_master_fader##nr(struct device *dev,        \
676                             struct device_attribute *attr,      \
677                             char *buf)                          \
678 {                                                               \
679         return show_master_fader(dev, attr, buf, nr);           \
680 }
681 
682 #define store_fader(nr)                                         \
683 static ssize_t store_master_fader##nr(struct device *dev,       \
684                              struct device_attribute *attr,     \
685                              const char *buf, size_t len)       \
686 {                                                               \
687         return store_master_fader(dev, attr, buf, len, nr);     \
688 }
689 
690 static ssize_t show_master_fader(struct device *dev,
691                                  struct device_attribute *attr,
692                                  char *buf, int nr)
693 {
694         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
695         struct lp55xx_chip *chip = led->chip;
696         int ret;
697         u8 val;
698 
699         mutex_lock(&chip->lock);
700         ret = lp55xx_read(chip, LP5523_REG_MASTER_FADER_BASE + nr - 1, &val);
701         mutex_unlock(&chip->lock);
702 
703         if (ret == 0)
704                 ret = sprintf(buf, "%u\n", val);
705 
706         return ret;
707 }
708 show_fader(1)
709 show_fader(2)
710 show_fader(3)
711 
712 static ssize_t store_master_fader(struct device *dev,
713                                   struct device_attribute *attr,
714                                   const char *buf, size_t len, int nr)
715 {
716         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
717         struct lp55xx_chip *chip = led->chip;
718         int ret;
719         unsigned long val;
720 
721         if (kstrtoul(buf, 0, &val))
722                 return -EINVAL;
723 
724         if (val > 0xff)
725                 return -EINVAL;
726 
727         mutex_lock(&chip->lock);
728         ret = lp55xx_write(chip, LP5523_REG_MASTER_FADER_BASE + nr - 1,
729                            (u8)val);
730         mutex_unlock(&chip->lock);
731 
732         if (ret == 0)
733                 ret = len;
734 
735         return ret;
736 }
737 store_fader(1)
738 store_fader(2)
739 store_fader(3)
740 
741 static ssize_t show_master_fader_leds(struct device *dev,
742                                       struct device_attribute *attr,
743                                       char *buf)
744 {
745         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
746         struct lp55xx_chip *chip = led->chip;
747         int i, ret, pos = 0;
748         u8 val;
749 
750         mutex_lock(&chip->lock);
751 
752         for (i = 0; i < LP5523_MAX_LEDS; i++) {
753                 ret = lp55xx_read(chip, LP5523_REG_LED_CTRL_BASE + i, &val);
754                 if (ret)
755                         goto leave;
756 
757                 val = (val & LP5523_FADER_MAPPING_MASK)
758                         >> LP5523_FADER_MAPPING_SHIFT;
759                 if (val > 3) {
760                         ret = -EINVAL;
761                         goto leave;
762                 }
763                 buf[pos++] = val + '';
764         }
765         buf[pos++] = '\n';
766         ret = pos;
767 leave:
768         mutex_unlock(&chip->lock);
769         return ret;
770 }
771 
772 static ssize_t store_master_fader_leds(struct device *dev,
773                                        struct device_attribute *attr,
774                                        const char *buf, size_t len)
775 {
776         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
777         struct lp55xx_chip *chip = led->chip;
778         int i, n, ret;
779         u8 val;
780 
781         n = min_t(int, len, LP5523_MAX_LEDS);
782 
783         mutex_lock(&chip->lock);
784 
785         for (i = 0; i < n; i++) {
786                 if (buf[i] >= '' && buf[i] <= '3') {
787                         val = (buf[i] - '') << LP5523_FADER_MAPPING_SHIFT;
788                         ret = lp55xx_update_bits(chip,
789                                                  LP5523_REG_LED_CTRL_BASE + i,
790                                                  LP5523_FADER_MAPPING_MASK,
791                                                  val);
792                         if (ret)
793                                 goto leave;
794                 } else {
795                         ret = -EINVAL;
796                         goto leave;
797                 }
798         }
799         ret = len;
800 leave:
801         mutex_unlock(&chip->lock);
802         return ret;
803 }
804 
805 static void lp5523_led_brightness_work(struct work_struct *work)
806 {
807         struct lp55xx_led *led = container_of(work, struct lp55xx_led,
808                                               brightness_work);
809         struct lp55xx_chip *chip = led->chip;
810 
811         mutex_lock(&chip->lock);
812         lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr,
813                      led->brightness);
814         mutex_unlock(&chip->lock);
815 }
816 
817 static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode);
818 static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode);
819 static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode);
820 static LP55XX_DEV_ATTR_RW(engine1_leds, show_engine1_leds, store_engine1_leds);
821 static LP55XX_DEV_ATTR_RW(engine2_leds, show_engine2_leds, store_engine2_leds);
822 static LP55XX_DEV_ATTR_RW(engine3_leds, show_engine3_leds, store_engine3_leds);
823 static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load);
824 static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load);
825 static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load);
826 static LP55XX_DEV_ATTR_RO(selftest, lp5523_selftest);
827 static LP55XX_DEV_ATTR_RW(master_fader1, show_master_fader1,
828                           store_master_fader1);
829 static LP55XX_DEV_ATTR_RW(master_fader2, show_master_fader2,
830                           store_master_fader2);
831 static LP55XX_DEV_ATTR_RW(master_fader3, show_master_fader3,
832                           store_master_fader3);
833 static LP55XX_DEV_ATTR_RW(master_fader_leds, show_master_fader_leds,
834                           store_master_fader_leds);
835 
836 static struct attribute *lp5523_attributes[] = {
837         &dev_attr_engine1_mode.attr,
838         &dev_attr_engine2_mode.attr,
839         &dev_attr_engine3_mode.attr,
840         &dev_attr_engine1_load.attr,
841         &dev_attr_engine2_load.attr,
842         &dev_attr_engine3_load.attr,
843         &dev_attr_engine1_leds.attr,
844         &dev_attr_engine2_leds.attr,
845         &dev_attr_engine3_leds.attr,
846         &dev_attr_selftest.attr,
847         &dev_attr_master_fader1.attr,
848         &dev_attr_master_fader2.attr,
849         &dev_attr_master_fader3.attr,
850         &dev_attr_master_fader_leds.attr,
851         NULL,
852 };
853 
854 static const struct attribute_group lp5523_group = {
855         .attrs = lp5523_attributes,
856 };
857 
858 /* Chip specific configurations */
859 static struct lp55xx_device_config lp5523_cfg = {
860         .reset = {
861                 .addr = LP5523_REG_RESET,
862                 .val  = LP5523_RESET,
863         },
864         .enable = {
865                 .addr = LP5523_REG_ENABLE,
866                 .val  = LP5523_ENABLE,
867         },
868         .max_channel  = LP5523_MAX_LEDS,
869         .post_init_device   = lp5523_post_init_device,
870         .brightness_work_fn = lp5523_led_brightness_work,
871         .set_led_current    = lp5523_set_led_current,
872         .firmware_cb        = lp5523_firmware_loaded,
873         .run_engine         = lp5523_run_engine,
874         .dev_attr_group     = &lp5523_group,
875 };
876 
877 static int lp5523_probe(struct i2c_client *client,
878                         const struct i2c_device_id *id)
879 {
880         int ret;
881         struct lp55xx_chip *chip;
882         struct lp55xx_led *led;
883         struct lp55xx_platform_data *pdata;
884         struct device_node *np = client->dev.of_node;
885 
886         if (!dev_get_platdata(&client->dev)) {
887                 if (np) {
888                         ret = lp55xx_of_populate_pdata(&client->dev, np);
889                         if (ret < 0)
890                                 return ret;
891                 } else {
892                         dev_err(&client->dev, "no platform data\n");
893                         return -EINVAL;
894                 }
895         }
896         pdata = dev_get_platdata(&client->dev);
897 
898         chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
899         if (!chip)
900                 return -ENOMEM;
901 
902         led = devm_kzalloc(&client->dev,
903                         sizeof(*led) * pdata->num_channels, GFP_KERNEL);
904         if (!led)
905                 return -ENOMEM;
906 
907         chip->cl = client;
908         chip->pdata = pdata;
909         chip->cfg = &lp5523_cfg;
910 
911         mutex_init(&chip->lock);
912 
913         i2c_set_clientdata(client, led);
914 
915         ret = lp55xx_init_device(chip);
916         if (ret)
917                 goto err_init;
918 
919         dev_info(&client->dev, "%s Programmable led chip found\n", id->name);
920 
921         ret = lp55xx_register_leds(led, chip);
922         if (ret)
923                 goto err_register_leds;
924 
925         ret = lp55xx_register_sysfs(chip);
926         if (ret) {
927                 dev_err(&client->dev, "registering sysfs failed\n");
928                 goto err_register_sysfs;
929         }
930 
931         return 0;
932 
933 err_register_sysfs:
934         lp55xx_unregister_leds(led, chip);
935 err_register_leds:
936         lp55xx_deinit_device(chip);
937 err_init:
938         return ret;
939 }
940 
941 static int lp5523_remove(struct i2c_client *client)
942 {
943         struct lp55xx_led *led = i2c_get_clientdata(client);
944         struct lp55xx_chip *chip = led->chip;
945 
946         lp5523_stop_all_engines(chip);
947         lp55xx_unregister_sysfs(chip);
948         lp55xx_unregister_leds(led, chip);
949         lp55xx_deinit_device(chip);
950 
951         return 0;
952 }
953 
954 static const struct i2c_device_id lp5523_id[] = {
955         { "lp5523",  LP5523 },
956         { "lp55231", LP55231 },
957         { }
958 };
959 
960 MODULE_DEVICE_TABLE(i2c, lp5523_id);
961 
962 #ifdef CONFIG_OF
963 static const struct of_device_id of_lp5523_leds_match[] = {
964         { .compatible = "national,lp5523", },
965         { .compatible = "ti,lp55231", },
966         {},
967 };
968 
969 MODULE_DEVICE_TABLE(of, of_lp5523_leds_match);
970 #endif
971 
972 static struct i2c_driver lp5523_driver = {
973         .driver = {
974                 .name   = "lp5523x",
975                 .of_match_table = of_match_ptr(of_lp5523_leds_match),
976         },
977         .probe          = lp5523_probe,
978         .remove         = lp5523_remove,
979         .id_table       = lp5523_id,
980 };
981 
982 module_i2c_driver(lp5523_driver);
983 
984 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
985 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
986 MODULE_DESCRIPTION("LP5523 LED engine");
987 MODULE_LICENSE("GPL");
988 

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