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
lp5523_wait_opmode_done(void)113 static inline void lp5523_wait_opmode_done(void)
114 {
115 usleep_range(1000, 2000);
116 }
117
lp5523_set_led_current(struct lp55xx_led * led,u8 led_current)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
lp5523_post_init_device(struct lp55xx_chip * chip)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
lp5523_load_engine(struct lp55xx_chip * chip)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
lp5523_load_engine_and_select_page(struct lp55xx_chip * chip)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
lp5523_stop_all_engines(struct lp55xx_chip * chip)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
lp5523_stop_engine(struct lp55xx_chip * chip)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
lp5523_turn_off_channels(struct lp55xx_chip * chip)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
lp5523_run_engine(struct lp55xx_chip * chip,bool start)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
lp5523_init_program_engine(struct lp55xx_chip * chip)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
lp5523_update_program_memory(struct lp55xx_chip * chip,const u8 * data,size_t size)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
lp5523_firmware_loaded(struct lp55xx_chip * chip)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
show_engine_mode(struct device * dev,struct device_attribute * attr,char * buf,int nr)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
store_engine_mode(struct device * dev,struct device_attribute * attr,const char * buf,size_t len,int nr)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
lp5523_mux_parse(const char * buf,u16 * mux,size_t len)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
lp5523_mux_to_array(u16 led_mux,char * array)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
show_engine_leds(struct device * dev,struct device_attribute * attr,char * buf,int nr)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
lp5523_load_mux(struct lp55xx_chip * chip,u16 mux,int nr)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
store_engine_leds(struct device * dev,struct device_attribute * attr,const char * buf,size_t len,int nr)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
store_engine_load(struct device * dev,struct device_attribute * attr,const char * buf,size_t len,int nr)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
lp5523_selftest(struct device * dev,struct device_attribute * attr,char * buf)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
show_master_fader(struct device * dev,struct device_attribute * attr,char * buf,int nr)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
store_master_fader(struct device * dev,struct device_attribute * attr,const char * buf,size_t len,int nr)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
show_master_fader_leds(struct device * dev,struct device_attribute * attr,char * buf)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
store_master_fader_leds(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)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
lp5523_multicolor_brightness(struct lp55xx_led * led)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
lp5523_led_brightness(struct lp55xx_led * led)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
lp5523_probe(struct i2c_client * client,const struct i2c_device_id * id)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
lp5523_remove(struct i2c_client * client)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");
996