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_MODE_MASK 0x18
61 #define LP5523_CP_MODE_SHIFT 3
62 #define LP5523_AUTO_CLK 0x02
63 #define LP5523_DEFAULT_CONFIG \
64 (LP5523_AUTO_INC | LP5523_PWR_SAVE | LP5523_AUTO_CLK | LP5523_PWM_PWR_SAVE)
65
66 #define LP5523_EN_LEDTEST 0x80
67 #define LP5523_LEDTEST_DONE 0x80
68 #define LP5523_RESET 0xFF
69 #define LP5523_ADC_SHORTCIRC_LIM 80
70 #define LP5523_EXT_CLK_USED 0x08
71 #define LP5523_ENG_STATUS_MASK 0x07
72
73 #define LP5523_FADER_MAPPING_MASK 0xC0
74 #define LP5523_FADER_MAPPING_SHIFT 6
75
76 /* Memory Page Selection */
77 #define LP5523_PAGE_ENG1 0
78 #define LP5523_PAGE_ENG2 1
79 #define LP5523_PAGE_ENG3 2
80 #define LP5523_PAGE_MUX1 3
81 #define LP5523_PAGE_MUX2 4
82 #define LP5523_PAGE_MUX3 5
83
84 /* Program Memory Operations */
85 #define LP5523_MODE_ENG1_M 0x30 /* Operation Mode Register */
86 #define LP5523_MODE_ENG2_M 0x0C
87 #define LP5523_MODE_ENG3_M 0x03
88 #define LP5523_LOAD_ENG1 0x10
89 #define LP5523_LOAD_ENG2 0x04
90 #define LP5523_LOAD_ENG3 0x01
91
92 #define LP5523_ENG1_IS_LOADING(mode) \
93 ((mode & LP5523_MODE_ENG1_M) == LP5523_LOAD_ENG1)
94 #define LP5523_ENG2_IS_LOADING(mode) \
95 ((mode & LP5523_MODE_ENG2_M) == LP5523_LOAD_ENG2)
96 #define LP5523_ENG3_IS_LOADING(mode) \
97 ((mode & LP5523_MODE_ENG3_M) == LP5523_LOAD_ENG3)
98
99 #define LP5523_EXEC_ENG1_M 0x30 /* Enable Register */
100 #define LP5523_EXEC_ENG2_M 0x0C
101 #define LP5523_EXEC_ENG3_M 0x03
102 #define LP5523_EXEC_M 0x3F
103 #define LP5523_RUN_ENG1 0x20
104 #define LP5523_RUN_ENG2 0x08
105 #define LP5523_RUN_ENG3 0x02
106
107 #define LED_ACTIVE(mux, led) (!!(mux & (0x0001 << led)))
108
109 enum lp5523_chip_id {
110 LP5523,
111 LP55231,
112 };
113
114 static int lp5523_init_program_engine(struct lp55xx_chip *chip);
115
lp5523_wait_opmode_done(void)116 static inline void lp5523_wait_opmode_done(void)
117 {
118 usleep_range(1000, 2000);
119 }
120
lp5523_set_led_current(struct lp55xx_led * led,u8 led_current)121 static void lp5523_set_led_current(struct lp55xx_led *led, u8 led_current)
122 {
123 led->led_current = led_current;
124 lp55xx_write(led->chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
125 led_current);
126 }
127
lp5523_post_init_device(struct lp55xx_chip * chip)128 static int lp5523_post_init_device(struct lp55xx_chip *chip)
129 {
130 int ret;
131 int val;
132
133 ret = lp55xx_write(chip, LP5523_REG_ENABLE, LP5523_ENABLE);
134 if (ret)
135 return ret;
136
137 /* Chip startup time is 500 us, 1 - 2 ms gives some margin */
138 usleep_range(1000, 2000);
139
140 val = LP5523_DEFAULT_CONFIG;
141 val |= (chip->pdata->charge_pump_mode << LP5523_CP_MODE_SHIFT) & LP5523_CP_MODE_MASK;
142
143 ret = lp55xx_write(chip, LP5523_REG_CONFIG, val);
144 if (ret)
145 return ret;
146
147 /* turn on all leds */
148 ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
149 if (ret)
150 return ret;
151
152 ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
153 if (ret)
154 return ret;
155
156 return lp5523_init_program_engine(chip);
157 }
158
lp5523_load_engine(struct lp55xx_chip * chip)159 static void lp5523_load_engine(struct lp55xx_chip *chip)
160 {
161 enum lp55xx_engine_index idx = chip->engine_idx;
162 static const u8 mask[] = {
163 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M,
164 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M,
165 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M,
166 };
167
168 static const u8 val[] = {
169 [LP55XX_ENGINE_1] = LP5523_LOAD_ENG1,
170 [LP55XX_ENGINE_2] = LP5523_LOAD_ENG2,
171 [LP55XX_ENGINE_3] = LP5523_LOAD_ENG3,
172 };
173
174 lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], val[idx]);
175
176 lp5523_wait_opmode_done();
177 }
178
lp5523_load_engine_and_select_page(struct lp55xx_chip * chip)179 static void lp5523_load_engine_and_select_page(struct lp55xx_chip *chip)
180 {
181 enum lp55xx_engine_index idx = chip->engine_idx;
182 static const u8 page_sel[] = {
183 [LP55XX_ENGINE_1] = LP5523_PAGE_ENG1,
184 [LP55XX_ENGINE_2] = LP5523_PAGE_ENG2,
185 [LP55XX_ENGINE_3] = LP5523_PAGE_ENG3,
186 };
187
188 lp5523_load_engine(chip);
189
190 lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, page_sel[idx]);
191 }
192
lp5523_stop_all_engines(struct lp55xx_chip * chip)193 static void lp5523_stop_all_engines(struct lp55xx_chip *chip)
194 {
195 lp55xx_write(chip, LP5523_REG_OP_MODE, 0);
196 lp5523_wait_opmode_done();
197 }
198
lp5523_stop_engine(struct lp55xx_chip * chip)199 static void lp5523_stop_engine(struct lp55xx_chip *chip)
200 {
201 enum lp55xx_engine_index idx = chip->engine_idx;
202 static const u8 mask[] = {
203 [LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M,
204 [LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M,
205 [LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M,
206 };
207
208 lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], 0);
209
210 lp5523_wait_opmode_done();
211 }
212
lp5523_turn_off_channels(struct lp55xx_chip * chip)213 static void lp5523_turn_off_channels(struct lp55xx_chip *chip)
214 {
215 int i;
216
217 for (i = 0; i < LP5523_MAX_LEDS; i++)
218 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0);
219 }
220
lp5523_run_engine(struct lp55xx_chip * chip,bool start)221 static void lp5523_run_engine(struct lp55xx_chip *chip, bool start)
222 {
223 int ret;
224 u8 mode;
225 u8 exec;
226
227 /* stop engine */
228 if (!start) {
229 lp5523_stop_engine(chip);
230 lp5523_turn_off_channels(chip);
231 return;
232 }
233
234 /*
235 * To run the engine,
236 * operation mode and enable register should updated at the same time
237 */
238
239 ret = lp55xx_read(chip, LP5523_REG_OP_MODE, &mode);
240 if (ret)
241 return;
242
243 ret = lp55xx_read(chip, LP5523_REG_ENABLE, &exec);
244 if (ret)
245 return;
246
247 /* change operation mode to RUN only when each engine is loading */
248 if (LP5523_ENG1_IS_LOADING(mode)) {
249 mode = (mode & ~LP5523_MODE_ENG1_M) | LP5523_RUN_ENG1;
250 exec = (exec & ~LP5523_EXEC_ENG1_M) | LP5523_RUN_ENG1;
251 }
252
253 if (LP5523_ENG2_IS_LOADING(mode)) {
254 mode = (mode & ~LP5523_MODE_ENG2_M) | LP5523_RUN_ENG2;
255 exec = (exec & ~LP5523_EXEC_ENG2_M) | LP5523_RUN_ENG2;
256 }
257
258 if (LP5523_ENG3_IS_LOADING(mode)) {
259 mode = (mode & ~LP5523_MODE_ENG3_M) | LP5523_RUN_ENG3;
260 exec = (exec & ~LP5523_EXEC_ENG3_M) | LP5523_RUN_ENG3;
261 }
262
263 lp55xx_write(chip, LP5523_REG_OP_MODE, mode);
264 lp5523_wait_opmode_done();
265
266 lp55xx_update_bits(chip, LP5523_REG_ENABLE, LP5523_EXEC_M, exec);
267 }
268
lp5523_init_program_engine(struct lp55xx_chip * chip)269 static int lp5523_init_program_engine(struct lp55xx_chip *chip)
270 {
271 int i;
272 int j;
273 int ret;
274 u8 status;
275 /* one pattern per engine setting LED MUX start and stop addresses */
276 static const u8 pattern[][LP5523_PROGRAM_LENGTH] = {
277 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
278 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
279 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
280 };
281
282 /* hardcode 32 bytes of memory for each engine from program memory */
283 ret = lp55xx_write(chip, LP5523_REG_CH1_PROG_START, 0x00);
284 if (ret)
285 return ret;
286
287 ret = lp55xx_write(chip, LP5523_REG_CH2_PROG_START, 0x10);
288 if (ret)
289 return ret;
290
291 ret = lp55xx_write(chip, LP5523_REG_CH3_PROG_START, 0x20);
292 if (ret)
293 return ret;
294
295 /* write LED MUX address space for each engine */
296 for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) {
297 chip->engine_idx = i;
298 lp5523_load_engine_and_select_page(chip);
299
300 for (j = 0; j < LP5523_PROGRAM_LENGTH; j++) {
301 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + j,
302 pattern[i - 1][j]);
303 if (ret)
304 goto out;
305 }
306 }
307
308 lp5523_run_engine(chip, true);
309
310 /* Let the programs run for couple of ms and check the engine status */
311 usleep_range(3000, 6000);
312 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
313 if (ret)
314 goto out;
315 status &= LP5523_ENG_STATUS_MASK;
316
317 if (status != LP5523_ENG_STATUS_MASK) {
318 dev_err(&chip->cl->dev,
319 "could not configure LED engine, status = 0x%.2x\n",
320 status);
321 ret = -1;
322 }
323
324 out:
325 lp5523_stop_all_engines(chip);
326 return ret;
327 }
328
lp5523_update_program_memory(struct lp55xx_chip * chip,const u8 * data,size_t size)329 static int lp5523_update_program_memory(struct lp55xx_chip *chip,
330 const u8 *data, size_t size)
331 {
332 u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
333 unsigned int cmd;
334 char c[3];
335 int nrchars;
336 int ret;
337 int offset = 0;
338 int i = 0;
339
340 while ((offset < size - 1) && (i < LP5523_PROGRAM_LENGTH)) {
341 /* separate sscanfs because length is working only for %s */
342 ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
343 if (ret != 1)
344 goto err;
345
346 ret = sscanf(c, "%2x", &cmd);
347 if (ret != 1)
348 goto err;
349
350 pattern[i] = (u8)cmd;
351 offset += nrchars;
352 i++;
353 }
354
355 /* Each instruction is 16bit long. Check that length is even */
356 if (i % 2)
357 goto err;
358
359 for (i = 0; i < LP5523_PROGRAM_LENGTH; i++) {
360 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + i, pattern[i]);
361 if (ret)
362 return -EINVAL;
363 }
364
365 return size;
366
367 err:
368 dev_err(&chip->cl->dev, "wrong pattern format\n");
369 return -EINVAL;
370 }
371
lp5523_firmware_loaded(struct lp55xx_chip * chip)372 static void lp5523_firmware_loaded(struct lp55xx_chip *chip)
373 {
374 const struct firmware *fw = chip->fw;
375
376 if (fw->size > LP5523_PROGRAM_LENGTH) {
377 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
378 fw->size);
379 return;
380 }
381
382 /*
383 * Program memory sequence
384 * 1) set engine mode to "LOAD"
385 * 2) write firmware data into program memory
386 */
387
388 lp5523_load_engine_and_select_page(chip);
389 lp5523_update_program_memory(chip, fw->data, fw->size);
390 }
391
show_engine_mode(struct device * dev,struct device_attribute * attr,char * buf,int nr)392 static ssize_t show_engine_mode(struct device *dev,
393 struct device_attribute *attr,
394 char *buf, int nr)
395 {
396 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
397 struct lp55xx_chip *chip = led->chip;
398 enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode;
399
400 switch (mode) {
401 case LP55XX_ENGINE_RUN:
402 return sprintf(buf, "run\n");
403 case LP55XX_ENGINE_LOAD:
404 return sprintf(buf, "load\n");
405 case LP55XX_ENGINE_DISABLED:
406 default:
407 return sprintf(buf, "disabled\n");
408 }
409 }
410 show_mode(1)
411 show_mode(2)
412 show_mode(3)
413
store_engine_mode(struct device * dev,struct device_attribute * attr,const char * buf,size_t len,int nr)414 static ssize_t store_engine_mode(struct device *dev,
415 struct device_attribute *attr,
416 const char *buf, size_t len, int nr)
417 {
418 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
419 struct lp55xx_chip *chip = led->chip;
420 struct lp55xx_engine *engine = &chip->engines[nr - 1];
421
422 mutex_lock(&chip->lock);
423
424 chip->engine_idx = nr;
425
426 if (!strncmp(buf, "run", 3)) {
427 lp5523_run_engine(chip, true);
428 engine->mode = LP55XX_ENGINE_RUN;
429 } else if (!strncmp(buf, "load", 4)) {
430 lp5523_stop_engine(chip);
431 lp5523_load_engine(chip);
432 engine->mode = LP55XX_ENGINE_LOAD;
433 } else if (!strncmp(buf, "disabled", 8)) {
434 lp5523_stop_engine(chip);
435 engine->mode = LP55XX_ENGINE_DISABLED;
436 }
437
438 mutex_unlock(&chip->lock);
439
440 return len;
441 }
442 store_mode(1)
443 store_mode(2)
444 store_mode(3)
445
lp5523_mux_parse(const char * buf,u16 * mux,size_t len)446 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
447 {
448 u16 tmp_mux = 0;
449 int i;
450
451 len = min_t(int, len, LP5523_MAX_LEDS);
452
453 for (i = 0; i < len; i++) {
454 switch (buf[i]) {
455 case '1':
456 tmp_mux |= (1 << i);
457 break;
458 case '0':
459 break;
460 case '\n':
461 i = len;
462 break;
463 default:
464 return -1;
465 }
466 }
467 *mux = tmp_mux;
468
469 return 0;
470 }
471
lp5523_mux_to_array(u16 led_mux,char * array)472 static void lp5523_mux_to_array(u16 led_mux, char *array)
473 {
474 int i, pos = 0;
475
476 for (i = 0; i < LP5523_MAX_LEDS; i++)
477 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
478
479 array[pos] = '\0';
480 }
481
show_engine_leds(struct device * dev,struct device_attribute * attr,char * buf,int nr)482 static ssize_t show_engine_leds(struct device *dev,
483 struct device_attribute *attr,
484 char *buf, int nr)
485 {
486 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
487 struct lp55xx_chip *chip = led->chip;
488 char mux[LP5523_MAX_LEDS + 1];
489
490 lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
491
492 return sprintf(buf, "%s\n", mux);
493 }
494 show_leds(1)
495 show_leds(2)
496 show_leds(3)
497
lp5523_load_mux(struct lp55xx_chip * chip,u16 mux,int nr)498 static int lp5523_load_mux(struct lp55xx_chip *chip, u16 mux, int nr)
499 {
500 struct lp55xx_engine *engine = &chip->engines[nr - 1];
501 int ret;
502 static const u8 mux_page[] = {
503 [LP55XX_ENGINE_1] = LP5523_PAGE_MUX1,
504 [LP55XX_ENGINE_2] = LP5523_PAGE_MUX2,
505 [LP55XX_ENGINE_3] = LP5523_PAGE_MUX3,
506 };
507
508 lp5523_load_engine(chip);
509
510 ret = lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, mux_page[nr]);
511 if (ret)
512 return ret;
513
514 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM, (u8)(mux >> 8));
515 if (ret)
516 return ret;
517
518 ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + 1, (u8)(mux));
519 if (ret)
520 return ret;
521
522 engine->led_mux = mux;
523 return 0;
524 }
525
store_engine_leds(struct device * dev,struct device_attribute * attr,const char * buf,size_t len,int nr)526 static ssize_t store_engine_leds(struct device *dev,
527 struct device_attribute *attr,
528 const char *buf, size_t len, int nr)
529 {
530 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
531 struct lp55xx_chip *chip = led->chip;
532 struct lp55xx_engine *engine = &chip->engines[nr - 1];
533 u16 mux = 0;
534 ssize_t ret;
535
536 if (lp5523_mux_parse(buf, &mux, len))
537 return -EINVAL;
538
539 mutex_lock(&chip->lock);
540
541 chip->engine_idx = nr;
542 ret = -EINVAL;
543
544 if (engine->mode != LP55XX_ENGINE_LOAD)
545 goto leave;
546
547 if (lp5523_load_mux(chip, mux, nr))
548 goto leave;
549
550 ret = len;
551 leave:
552 mutex_unlock(&chip->lock);
553 return ret;
554 }
555 store_leds(1)
556 store_leds(2)
557 store_leds(3)
558
store_engine_load(struct device * dev,struct device_attribute * attr,const char * buf,size_t len,int nr)559 static ssize_t store_engine_load(struct device *dev,
560 struct device_attribute *attr,
561 const char *buf, size_t len, int nr)
562 {
563 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
564 struct lp55xx_chip *chip = led->chip;
565 int ret;
566
567 mutex_lock(&chip->lock);
568
569 chip->engine_idx = nr;
570 lp5523_load_engine_and_select_page(chip);
571 ret = lp5523_update_program_memory(chip, buf, len);
572
573 mutex_unlock(&chip->lock);
574
575 return ret;
576 }
577 store_load(1)
578 store_load(2)
579 store_load(3)
580
lp5523_selftest(struct device * dev,struct device_attribute * attr,char * buf)581 static ssize_t lp5523_selftest(struct device *dev,
582 struct device_attribute *attr,
583 char *buf)
584 {
585 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
586 struct lp55xx_chip *chip = led->chip;
587 struct lp55xx_platform_data *pdata = chip->pdata;
588 int ret, pos = 0;
589 u8 status, adc, vdd, i;
590
591 mutex_lock(&chip->lock);
592
593 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
594 if (ret < 0)
595 goto fail;
596
597 /* Check that ext clock is really in use if requested */
598 if (pdata->clock_mode == LP55XX_CLOCK_EXT) {
599 if ((status & LP5523_EXT_CLK_USED) == 0)
600 goto fail;
601 }
602
603 /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
604 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, LP5523_EN_LEDTEST | 16);
605 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
606 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
607 if (ret < 0)
608 goto fail;
609
610 if (!(status & LP5523_LEDTEST_DONE))
611 usleep_range(3000, 6000); /* Was not ready. Wait little bit */
612
613 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &vdd);
614 if (ret < 0)
615 goto fail;
616
617 vdd--; /* There may be some fluctuation in measurement */
618
619 for (i = 0; i < pdata->num_channels; i++) {
620 /* Skip disabled channels */
621 if (pdata->led_config[i].led_current == 0)
622 continue;
623
624 /* Set default current */
625 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
626 pdata->led_config[i].led_current);
627
628 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr,
629 0xff);
630 /* let current stabilize 2 - 4ms before measurements start */
631 usleep_range(2000, 4000);
632 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL,
633 LP5523_EN_LEDTEST | led->chan_nr);
634 /* ADC conversion time is 2.7 ms typically */
635 usleep_range(3000, 6000);
636 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
637 if (ret < 0)
638 goto fail;
639
640 if (!(status & LP5523_LEDTEST_DONE))
641 usleep_range(3000, 6000); /* Was not ready. Wait. */
642
643 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &adc);
644 if (ret < 0)
645 goto fail;
646
647 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
648 pos += sprintf(buf + pos, "LED %d FAIL\n",
649 led->chan_nr);
650
651 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr,
652 0x00);
653
654 /* Restore current */
655 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
656 led->led_current);
657 led++;
658 }
659 if (pos == 0)
660 pos = sprintf(buf, "OK\n");
661 goto release_lock;
662 fail:
663 pos = sprintf(buf, "FAIL\n");
664
665 release_lock:
666 mutex_unlock(&chip->lock);
667
668 return pos;
669 }
670
671 #define show_fader(nr) \
672 static ssize_t show_master_fader##nr(struct device *dev, \
673 struct device_attribute *attr, \
674 char *buf) \
675 { \
676 return show_master_fader(dev, attr, buf, nr); \
677 }
678
679 #define store_fader(nr) \
680 static ssize_t store_master_fader##nr(struct device *dev, \
681 struct device_attribute *attr, \
682 const char *buf, size_t len) \
683 { \
684 return store_master_fader(dev, attr, buf, len, nr); \
685 }
686
show_master_fader(struct device * dev,struct device_attribute * attr,char * buf,int nr)687 static ssize_t show_master_fader(struct device *dev,
688 struct device_attribute *attr,
689 char *buf, int nr)
690 {
691 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
692 struct lp55xx_chip *chip = led->chip;
693 int ret;
694 u8 val;
695
696 mutex_lock(&chip->lock);
697 ret = lp55xx_read(chip, LP5523_REG_MASTER_FADER_BASE + nr - 1, &val);
698 mutex_unlock(&chip->lock);
699
700 if (ret == 0)
701 ret = sprintf(buf, "%u\n", val);
702
703 return ret;
704 }
705 show_fader(1)
706 show_fader(2)
707 show_fader(3)
708
store_master_fader(struct device * dev,struct device_attribute * attr,const char * buf,size_t len,int nr)709 static ssize_t store_master_fader(struct device *dev,
710 struct device_attribute *attr,
711 const char *buf, size_t len, int nr)
712 {
713 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
714 struct lp55xx_chip *chip = led->chip;
715 int ret;
716 unsigned long val;
717
718 if (kstrtoul(buf, 0, &val))
719 return -EINVAL;
720
721 if (val > 0xff)
722 return -EINVAL;
723
724 mutex_lock(&chip->lock);
725 ret = lp55xx_write(chip, LP5523_REG_MASTER_FADER_BASE + nr - 1,
726 (u8)val);
727 mutex_unlock(&chip->lock);
728
729 if (ret == 0)
730 ret = len;
731
732 return ret;
733 }
734 store_fader(1)
735 store_fader(2)
736 store_fader(3)
737
show_master_fader_leds(struct device * dev,struct device_attribute * attr,char * buf)738 static ssize_t show_master_fader_leds(struct device *dev,
739 struct device_attribute *attr,
740 char *buf)
741 {
742 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
743 struct lp55xx_chip *chip = led->chip;
744 int i, ret, pos = 0;
745 u8 val;
746
747 mutex_lock(&chip->lock);
748
749 for (i = 0; i < LP5523_MAX_LEDS; i++) {
750 ret = lp55xx_read(chip, LP5523_REG_LED_CTRL_BASE + i, &val);
751 if (ret)
752 goto leave;
753
754 val = (val & LP5523_FADER_MAPPING_MASK)
755 >> LP5523_FADER_MAPPING_SHIFT;
756 if (val > 3) {
757 ret = -EINVAL;
758 goto leave;
759 }
760 buf[pos++] = val + '0';
761 }
762 buf[pos++] = '\n';
763 ret = pos;
764 leave:
765 mutex_unlock(&chip->lock);
766 return ret;
767 }
768
store_master_fader_leds(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)769 static ssize_t store_master_fader_leds(struct device *dev,
770 struct device_attribute *attr,
771 const char *buf, size_t len)
772 {
773 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
774 struct lp55xx_chip *chip = led->chip;
775 int i, n, ret;
776 u8 val;
777
778 n = min_t(int, len, LP5523_MAX_LEDS);
779
780 mutex_lock(&chip->lock);
781
782 for (i = 0; i < n; i++) {
783 if (buf[i] >= '0' && buf[i] <= '3') {
784 val = (buf[i] - '0') << LP5523_FADER_MAPPING_SHIFT;
785 ret = lp55xx_update_bits(chip,
786 LP5523_REG_LED_CTRL_BASE + i,
787 LP5523_FADER_MAPPING_MASK,
788 val);
789 if (ret)
790 goto leave;
791 } else {
792 ret = -EINVAL;
793 goto leave;
794 }
795 }
796 ret = len;
797 leave:
798 mutex_unlock(&chip->lock);
799 return ret;
800 }
801
lp5523_multicolor_brightness(struct lp55xx_led * led)802 static int lp5523_multicolor_brightness(struct lp55xx_led *led)
803 {
804 struct lp55xx_chip *chip = led->chip;
805 int ret;
806 int i;
807
808 mutex_lock(&chip->lock);
809 for (i = 0; i < led->mc_cdev.num_colors; i++) {
810 ret = lp55xx_write(chip,
811 LP5523_REG_LED_PWM_BASE +
812 led->mc_cdev.subled_info[i].channel,
813 led->mc_cdev.subled_info[i].brightness);
814 if (ret)
815 break;
816 }
817 mutex_unlock(&chip->lock);
818 return ret;
819 }
820
lp5523_led_brightness(struct lp55xx_led * led)821 static int lp5523_led_brightness(struct lp55xx_led *led)
822 {
823 struct lp55xx_chip *chip = led->chip;
824 int ret;
825
826 mutex_lock(&chip->lock);
827 ret = lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr,
828 led->brightness);
829 mutex_unlock(&chip->lock);
830 return ret;
831 }
832
833 static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode);
834 static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode);
835 static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode);
836 static LP55XX_DEV_ATTR_RW(engine1_leds, show_engine1_leds, store_engine1_leds);
837 static LP55XX_DEV_ATTR_RW(engine2_leds, show_engine2_leds, store_engine2_leds);
838 static LP55XX_DEV_ATTR_RW(engine3_leds, show_engine3_leds, store_engine3_leds);
839 static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load);
840 static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load);
841 static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load);
842 static LP55XX_DEV_ATTR_RO(selftest, lp5523_selftest);
843 static LP55XX_DEV_ATTR_RW(master_fader1, show_master_fader1,
844 store_master_fader1);
845 static LP55XX_DEV_ATTR_RW(master_fader2, show_master_fader2,
846 store_master_fader2);
847 static LP55XX_DEV_ATTR_RW(master_fader3, show_master_fader3,
848 store_master_fader3);
849 static LP55XX_DEV_ATTR_RW(master_fader_leds, show_master_fader_leds,
850 store_master_fader_leds);
851
852 static struct attribute *lp5523_attributes[] = {
853 &dev_attr_engine1_mode.attr,
854 &dev_attr_engine2_mode.attr,
855 &dev_attr_engine3_mode.attr,
856 &dev_attr_engine1_load.attr,
857 &dev_attr_engine2_load.attr,
858 &dev_attr_engine3_load.attr,
859 &dev_attr_engine1_leds.attr,
860 &dev_attr_engine2_leds.attr,
861 &dev_attr_engine3_leds.attr,
862 &dev_attr_selftest.attr,
863 &dev_attr_master_fader1.attr,
864 &dev_attr_master_fader2.attr,
865 &dev_attr_master_fader3.attr,
866 &dev_attr_master_fader_leds.attr,
867 NULL,
868 };
869
870 static const struct attribute_group lp5523_group = {
871 .attrs = lp5523_attributes,
872 };
873
874 /* Chip specific configurations */
875 static struct lp55xx_device_config lp5523_cfg = {
876 .reset = {
877 .addr = LP5523_REG_RESET,
878 .val = LP5523_RESET,
879 },
880 .enable = {
881 .addr = LP5523_REG_ENABLE,
882 .val = LP5523_ENABLE,
883 },
884 .max_channel = LP5523_MAX_LEDS,
885 .post_init_device = lp5523_post_init_device,
886 .brightness_fn = lp5523_led_brightness,
887 .multicolor_brightness_fn = lp5523_multicolor_brightness,
888 .set_led_current = lp5523_set_led_current,
889 .firmware_cb = lp5523_firmware_loaded,
890 .run_engine = lp5523_run_engine,
891 .dev_attr_group = &lp5523_group,
892 };
893
lp5523_probe(struct i2c_client * client)894 static int lp5523_probe(struct i2c_client *client)
895 {
896 const struct i2c_device_id *id = i2c_client_get_device_id(client);
897 int ret;
898 struct lp55xx_chip *chip;
899 struct lp55xx_led *led;
900 struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev);
901 struct device_node *np = dev_of_node(&client->dev);
902
903 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
904 if (!chip)
905 return -ENOMEM;
906
907 chip->cfg = &lp5523_cfg;
908
909 if (!pdata) {
910 if (np) {
911 pdata = lp55xx_of_populate_pdata(&client->dev, np,
912 chip);
913 if (IS_ERR(pdata))
914 return PTR_ERR(pdata);
915 } else {
916 dev_err(&client->dev, "no platform data\n");
917 return -EINVAL;
918 }
919 }
920
921 led = devm_kcalloc(&client->dev,
922 pdata->num_channels, sizeof(*led), GFP_KERNEL);
923 if (!led)
924 return -ENOMEM;
925
926 chip->cl = client;
927 chip->pdata = pdata;
928
929 mutex_init(&chip->lock);
930
931 i2c_set_clientdata(client, led);
932
933 ret = lp55xx_init_device(chip);
934 if (ret)
935 goto err_init;
936
937 dev_info(&client->dev, "%s Programmable led chip found\n", id->name);
938
939 ret = lp55xx_register_leds(led, chip);
940 if (ret)
941 goto err_out;
942
943 ret = lp55xx_register_sysfs(chip);
944 if (ret) {
945 dev_err(&client->dev, "registering sysfs failed\n");
946 goto err_out;
947 }
948
949 return 0;
950
951 err_out:
952 lp55xx_deinit_device(chip);
953 err_init:
954 return ret;
955 }
956
lp5523_remove(struct i2c_client * client)957 static void lp5523_remove(struct i2c_client *client)
958 {
959 struct lp55xx_led *led = i2c_get_clientdata(client);
960 struct lp55xx_chip *chip = led->chip;
961
962 lp5523_stop_all_engines(chip);
963 lp55xx_unregister_sysfs(chip);
964 lp55xx_deinit_device(chip);
965 }
966
967 static const struct i2c_device_id lp5523_id[] = {
968 { "lp5523", LP5523 },
969 { "lp55231", LP55231 },
970 { }
971 };
972
973 MODULE_DEVICE_TABLE(i2c, lp5523_id);
974
975 static const struct of_device_id of_lp5523_leds_match[] = {
976 { .compatible = "national,lp5523", },
977 { .compatible = "ti,lp55231", },
978 {},
979 };
980
981 MODULE_DEVICE_TABLE(of, of_lp5523_leds_match);
982
983 static struct i2c_driver lp5523_driver = {
984 .driver = {
985 .name = "lp5523x",
986 .of_match_table = of_lp5523_leds_match,
987 },
988 .probe = lp5523_probe,
989 .remove = lp5523_remove,
990 .id_table = lp5523_id,
991 };
992
993 module_i2c_driver(lp5523_driver);
994
995 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
996 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
997 MODULE_DESCRIPTION("LP5523 LED engine");
998 MODULE_LICENSE("GPL");
999