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leds-lp55xx: clean up init function
[linux-2.6-block.git] / drivers / leds / leds-lp5523.c
CommitLineData
0efba16c
SO		 1/*
2 * lp5523.c - LP5523 LED Driver
3 *
4 * Copyright (C) 2010 Nokia Corporation
5 *
6 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 */
22
23#include <linux/module.h>
24#include <linux/init.h>
25#include <linux/i2c.h>
26#include <linux/mutex.h>
27#include <linux/gpio.h>
28#include <linux/interrupt.h>
29#include <linux/delay.h>
30#include <linux/ctype.h>
31#include <linux/spinlock.h>
32#include <linux/wait.h>
33#include <linux/leds.h>
34#include <linux/leds-lp5523.h>
35#include <linux/workqueue.h>
36#include <linux/slab.h>
6a0c9a47
MWK		 37#include <linux/platform_data/leds-lp55xx.h>
38
39#include "leds-lp55xx-common.h"
0efba16c
SO		 40
41#define LP5523_REG_ENABLE 0x00
42#define LP5523_REG_OP_MODE 0x01
43#define LP5523_REG_RATIOMETRIC_MSB 0x02
44#define LP5523_REG_RATIOMETRIC_LSB 0x03
45#define LP5523_REG_ENABLE_LEDS_MSB 0x04
46#define LP5523_REG_ENABLE_LEDS_LSB 0x05
47#define LP5523_REG_LED_CNTRL_BASE 0x06
48#define LP5523_REG_LED_PWM_BASE 0x16
49#define LP5523_REG_LED_CURRENT_BASE 0x26
50#define LP5523_REG_CONFIG 0x36
51#define LP5523_REG_CHANNEL1_PC 0x37
52#define LP5523_REG_CHANNEL2_PC 0x38
53#define LP5523_REG_CHANNEL3_PC 0x39
54#define LP5523_REG_STATUS 0x3a
55#define LP5523_REG_GPO 0x3b
56#define LP5523_REG_VARIABLE 0x3c
57#define LP5523_REG_RESET 0x3d
58#define LP5523_REG_TEMP_CTRL 0x3e
59#define LP5523_REG_TEMP_READ 0x3f
60#define LP5523_REG_TEMP_WRITE 0x40
61#define LP5523_REG_LED_TEST_CTRL 0x41
62#define LP5523_REG_LED_TEST_ADC 0x42
63#define LP5523_REG_ENG1_VARIABLE 0x45
64#define LP5523_REG_ENG2_VARIABLE 0x46
65#define LP5523_REG_ENG3_VARIABLE 0x47
66#define LP5523_REG_MASTER_FADER1 0x48
67#define LP5523_REG_MASTER_FADER2 0x49
68#define LP5523_REG_MASTER_FADER3 0x4a
69#define LP5523_REG_CH1_PROG_START 0x4c
70#define LP5523_REG_CH2_PROG_START 0x4d
71#define LP5523_REG_CH3_PROG_START 0x4e
72#define LP5523_REG_PROG_PAGE_SEL 0x4f
73#define LP5523_REG_PROG_MEM 0x50
74
75#define LP5523_CMD_LOAD 0x15 /* 00010101 */
76#define LP5523_CMD_RUN 0x2a /* 00101010 */
77#define LP5523_CMD_DISABLED 0x00 /* 00000000 */
78
79#define LP5523_ENABLE 0x40
80#define LP5523_AUTO_INC 0x40
81#define LP5523_PWR_SAVE 0x20
82#define LP5523_PWM_PWR_SAVE 0x04
83#define LP5523_CP_1 0x08
84#define LP5523_CP_1_5 0x10
85#define LP5523_CP_AUTO 0x18
86#define LP5523_INT_CLK 0x01
87#define LP5523_AUTO_CLK 0x02
88#define LP5523_EN_LEDTEST 0x80
89#define LP5523_LEDTEST_DONE 0x80
48068d5d 90#define LP5523_RESET 0xFF
0efba16c
SO		 91
92#define LP5523_DEFAULT_CURRENT 50 /* microAmps */
93#define LP5523_PROGRAM_LENGTH 32 /* in bytes */
94#define LP5523_PROGRAM_PAGES 6
95#define LP5523_ADC_SHORTCIRC_LIM 80
96
97#define LP5523_LEDS 9
98#define LP5523_ENGINES 3
99
100#define LP5523_ENG_MASK_BASE 0x30 /* 00110000 */
101
102#define LP5523_ENG_STATUS_MASK 0x07 /* 00000111 */
103
104#define LP5523_IRQ_FLAGS IRQF_TRIGGER_FALLING
105
106#define LP5523_EXT_CLK_USED 0x08
107
108#define LED_ACTIVE(mux, led) (!!(mux & (0x0001 << led)))
109#define SHIFT_MASK(id) (((id) - 1) * 2)
110
27d7704e
KM		 111enum lp5523_chip_id {
112 LP5523,
113 LP55231,
114};
115
0efba16c 116struct lp5523_engine {
0efba16c
SO		 117 int id;
118 u8 mode;
119 u8 prog_page;
120 u8 mux_page;
121 u16 led_mux;
122 u8 engine_mask;
123};
124
125struct lp5523_led {
126 int id;
127 u8 chan_nr;
128 u8 led_current;
129 u8 max_current;
130 struct led_classdev cdev;
131 struct work_struct brightness_work;
132 u8 brightness;
133};
134
135struct lp5523_chip {
136 struct mutex lock; /* Serialize control */
137 struct i2c_client *client;
138 struct lp5523_engine engines[LP5523_ENGINES];
139 struct lp5523_led leds[LP5523_LEDS];
140 struct lp5523_platform_data *pdata;
141 u8 num_channels;
142 u8 num_leds;
143};
144
87dbf623
SO		 145static inline struct lp5523_led *cdev_to_led(struct led_classdev *cdev)
146{
147 return container_of(cdev, struct lp5523_led, cdev);
148}
0efba16c 149
87dbf623 150static inline struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine)
0efba16c
SO		 151{
152 return container_of(engine, struct lp5523_chip,
153 engines[engine->id - 1]);
154}
155
87dbf623 156static inline struct lp5523_chip *led_to_lp5523(struct lp5523_led *led)
0efba16c
SO		 157{
158 return container_of(led, struct lp5523_chip,
159 leds[led->id]);
160}
161
6f6365fb 162static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode);
0efba16c 163static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode);
d06cb46c 164static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern);
0efba16c
SO		 165
166static void lp5523_led_brightness_work(struct work_struct *work);
167
168static int lp5523_write(struct i2c_client *client, u8 reg, u8 value)
169{
170 return i2c_smbus_write_byte_data(client, reg, value);
171}
172
173static int lp5523_read(struct i2c_client *client, u8 reg, u8 *buf)
174{
175 s32 ret = i2c_smbus_read_byte_data(client, reg);
176
177 if (ret < 0)
5ebab74a 178 return ret;
0efba16c
SO		 179
180 *buf = ret;
181 return 0;
182}
183
ffbdccdb 184static int lp5523_post_init_device(struct lp55xx_chip *chip)
0efba16c 185{
ffbdccdb 186 int ret;
0efba16c 187
ffbdccdb 188 ret = lp55xx_write(chip, LP5523_REG_ENABLE, LP5523_ENABLE);
632418bf
MWK		 189 if (ret)
190 return ret;
0efba16c 191
2e4840ed
SO		 192 /* Chip startup time is 500 us, 1 - 2 ms gives some margin */
193 usleep_range(1000, 2000);
0efba16c 194
ffbdccdb 195 ret = lp55xx_write(chip, LP5523_REG_CONFIG,
0efba16c
SO		 196 LP5523_AUTO_INC | LP5523_PWR_SAVE |
197 LP5523_CP_AUTO | LP5523_AUTO_CLK |
198 LP5523_PWM_PWR_SAVE);
632418bf
MWK		 199 if (ret)
200 return ret;
0efba16c
SO		 201
202 /* turn on all leds */
ffbdccdb 203 ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
632418bf 204 if (ret)
1b21ec5a
JH		 205 return ret;
206
ffbdccdb 207 return lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
0efba16c
SO		 208}
209
210static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode)
211{
212 struct lp5523_chip *chip = engine_to_lp5523(engine);
213 struct i2c_client *client = chip->client;
214 int ret;
215 u8 engine_state;
216
217 ret = lp5523_read(client, LP5523_REG_OP_MODE, &engine_state);
218 if (ret)
219 goto fail;
220
221 engine_state &= ~(engine->engine_mask);
222
223 /* set mode only for this engine */
224 mode &= engine->engine_mask;
225
226 engine_state |= mode;
227
228 ret |= lp5523_write(client, LP5523_REG_OP_MODE, engine_state);
229fail:
230 return ret;
231}
232
233static int lp5523_load_mux(struct lp5523_engine *engine, u16 mux)
234{
235 struct lp5523_chip *chip = engine_to_lp5523(engine);
236 struct i2c_client *client = chip->client;
237 int ret = 0;
238
239 ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
240
241 ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, engine->mux_page);
242 ret |= lp5523_write(client, LP5523_REG_PROG_MEM,
243 (u8)(mux >> 8));
244 ret |= lp5523_write(client, LP5523_REG_PROG_MEM + 1, (u8)(mux));
245 engine->led_mux = mux;
246
247 return ret;
248}
249
d06cb46c 250static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern)
0efba16c
SO		 251{
252 struct lp5523_chip *chip = engine_to_lp5523(engine);
253 struct i2c_client *client = chip->client;
254
255 int ret = 0;
256
257 ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
258
259 ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL,
260 engine->prog_page);
261 ret |= i2c_smbus_write_i2c_block_data(client, LP5523_REG_PROG_MEM,
262 LP5523_PROGRAM_LENGTH, pattern);
263
264 return ret;
265}
266
267static int lp5523_run_program(struct lp5523_engine *engine)
268{
269 struct lp5523_chip *chip = engine_to_lp5523(engine);
270 struct i2c_client *client = chip->client;
271 int ret;
272
273 ret = lp5523_write(client, LP5523_REG_ENABLE,
274 LP5523_CMD_RUN | LP5523_ENABLE);
275 if (ret)
276 goto fail;
277
278 ret = lp5523_set_engine_mode(engine, LP5523_CMD_RUN);
279fail:
280 return ret;
281}
282
283static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
284{
285 int i;
286 u16 tmp_mux = 0;
469eba02
KM		 287
288 len = min_t(int, len, LP5523_LEDS);
0efba16c
SO		 289 for (i = 0; i < len; i++) {
290 switch (buf[i]) {
291 case '1':
292 tmp_mux |= (1 << i);
293 break;
294 case '0':
295 break;
296 case '\n':
297 i = len;
298 break;
299 default:
300 return -1;
301 }
302 }
303 *mux = tmp_mux;
304
305 return 0;
306}
307
308static void lp5523_mux_to_array(u16 led_mux, char *array)
309{
310 int i, pos = 0;
311 for (i = 0; i < LP5523_LEDS; i++)
312 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
313
314 array[pos] = '\0';
315}
316
317/*--------------------------------------------------------------*/
318/* Sysfs interface */
319/*--------------------------------------------------------------*/
320
321static ssize_t show_engine_leds(struct device *dev,
322 struct device_attribute *attr,
323 char *buf, int nr)
324{
325 struct i2c_client *client = to_i2c_client(dev);
326 struct lp5523_chip *chip = i2c_get_clientdata(client);
327 char mux[LP5523_LEDS + 1];
328
329 lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
330
331 return sprintf(buf, "%s\n", mux);
332}
333
334#define show_leds(nr) \
335static ssize_t show_engine##nr##_leds(struct device *dev, \
336 struct device_attribute *attr, \
337 char *buf) \
338{ \
339 return show_engine_leds(dev, attr, buf, nr); \
340}
341show_leds(1)
342show_leds(2)
343show_leds(3)
344
345static ssize_t store_engine_leds(struct device *dev,
346 struct device_attribute *attr,
347 const char *buf, size_t len, int nr)
348{
349 struct i2c_client *client = to_i2c_client(dev);
350 struct lp5523_chip *chip = i2c_get_clientdata(client);
351 u16 mux = 0;
fbac0812 352 ssize_t ret;
0efba16c
SO		 353
354 if (lp5523_mux_parse(buf, &mux, len))
355 return -EINVAL;
356
fbac0812
SO		 357 mutex_lock(&chip->lock);
358 ret = -EINVAL;
359 if (chip->engines[nr - 1].mode != LP5523_CMD_LOAD)
360 goto leave;
361
0efba16c 362 if (lp5523_load_mux(&chip->engines[nr - 1], mux))
fbac0812 363 goto leave;
0efba16c 364
fbac0812
SO		 365 ret = len;
366leave:
367 mutex_unlock(&chip->lock);
368 return ret;
0efba16c
SO		 369}
370
371#define store_leds(nr) \
372static ssize_t store_engine##nr##_leds(struct device *dev, \
373 struct device_attribute *attr, \
374 const char *buf, size_t len) \
375{ \
376 return store_engine_leds(dev, attr, buf, len, nr); \
377}
378store_leds(1)
379store_leds(2)
380store_leds(3)
381
382static ssize_t lp5523_selftest(struct device *dev,
383 struct device_attribute *attr,
384 char *buf)
385{
386 struct i2c_client *client = to_i2c_client(dev);
387 struct lp5523_chip *chip = i2c_get_clientdata(client);
388 int i, ret, pos = 0;
389 int led = 0;
390 u8 status, adc, vdd;
391
392 mutex_lock(&chip->lock);
393
394 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
395 if (ret < 0)
396 goto fail;
397
398 /* Check that ext clock is really in use if requested */
399 if ((chip->pdata) && (chip->pdata->clock_mode == LP5523_CLOCK_EXT))
400 if ((status & LP5523_EXT_CLK_USED) == 0)
401 goto fail;
402
403 /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
404 lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL,
405 LP5523_EN_LEDTEST | 16);
2e4840ed 406 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
0efba16c 407 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
1b21ec5a
JH		 408 if (ret < 0)
409 goto fail;
410
0efba16c 411 if (!(status & LP5523_LEDTEST_DONE))
2e4840ed 412 usleep_range(3000, 6000); /* Was not ready. Wait little bit */
0efba16c 413
1b21ec5a
JH		 414 ret = lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd);
415 if (ret < 0)
416 goto fail;
417
0efba16c
SO		 418 vdd--; /* There may be some fluctuation in measurement */
419
420 for (i = 0; i < LP5523_LEDS; i++) {
421 /* Skip non-existing channels */
422 if (chip->pdata->led_config[i].led_current == 0)
423 continue;
424
425 /* Set default current */
426 lp5523_write(chip->client,
427 LP5523_REG_LED_CURRENT_BASE + i,
428 chip->pdata->led_config[i].led_current);
429
430 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff);
2e4840ed
SO		 431 /* let current stabilize 2 - 4ms before measurements start */
432 usleep_range(2000, 4000);
0efba16c
SO		 433 lp5523_write(chip->client,
434 LP5523_REG_LED_TEST_CTRL,
435 LP5523_EN_LEDTEST | i);
2e4840ed
SO		 436 /* ADC conversion time is 2.7 ms typically */
437 usleep_range(3000, 6000);
0efba16c 438 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
1b21ec5a
JH		 439 if (ret < 0)
440 goto fail;
441
0efba16c 442 if (!(status & LP5523_LEDTEST_DONE))
2e4840ed 443 usleep_range(3000, 6000);/* Was not ready. Wait. */
1b21ec5a
JH		 444 ret = lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc);
445 if (ret < 0)
446 goto fail;
0efba16c
SO		 447
448 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
449 pos += sprintf(buf + pos, "LED %d FAIL\n", i);
450
451 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00);
452
453 /* Restore current */
454 lp5523_write(chip->client,
455 LP5523_REG_LED_CURRENT_BASE + i,
456 chip->leds[led].led_current);
457 led++;
458 }
459 if (pos == 0)
460 pos = sprintf(buf, "OK\n");
461 goto release_lock;
462fail:
463 pos = sprintf(buf, "FAIL\n");
464
465release_lock:
466 mutex_unlock(&chip->lock);
467
468 return pos;
469}
470
471static void lp5523_set_brightness(struct led_classdev *cdev,
472 enum led_brightness brightness)
473{
474 struct lp5523_led *led = cdev_to_led(cdev);
475
476 led->brightness = (u8)brightness;
477
478 schedule_work(&led->brightness_work);
479}
480
481static void lp5523_led_brightness_work(struct work_struct *work)
482{
483 struct lp5523_led *led = container_of(work,
484 struct lp5523_led,
485 brightness_work);
486 struct lp5523_chip *chip = led_to_lp5523(led);
487 struct i2c_client *client = chip->client;
488
489 mutex_lock(&chip->lock);
490
491 lp5523_write(client, LP5523_REG_LED_PWM_BASE + led->chan_nr,
492 led->brightness);
493
494 mutex_unlock(&chip->lock);
495}
496
497static int lp5523_do_store_load(struct lp5523_engine *engine,
498 const char *buf, size_t len)
499{
500 struct lp5523_chip *chip = engine_to_lp5523(engine);
501 struct i2c_client *client = chip->client;
502 int ret, nrchars, offset = 0, i = 0;
503 char c[3];
504 unsigned cmd;
505 u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
506
469eba02
KM		 507 if (engine->mode != LP5523_CMD_LOAD)
508 return -EINVAL;
509
0efba16c
SO		 510 while ((offset < len - 1) && (i < LP5523_PROGRAM_LENGTH)) {
511 /* separate sscanfs because length is working only for %s */
512 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
513 ret = sscanf(c, "%2x", &cmd);
514 if (ret != 1)
515 goto fail;
516 pattern[i] = (u8)cmd;
517
518 offset += nrchars;
519 i++;
520 }
521
522 /* Each instruction is 16bit long. Check that length is even */
523 if (i % 2)
524 goto fail;
525
526 mutex_lock(&chip->lock);
469eba02 527 ret = lp5523_load_program(engine, pattern);
0efba16c
SO		 528 mutex_unlock(&chip->lock);
529
530 if (ret) {
531 dev_err(&client->dev, "failed loading pattern\n");
532 return ret;
533 }
534
535 return len;
536fail:
537 dev_err(&client->dev, "wrong pattern format\n");
538 return -EINVAL;
539}
540
541static ssize_t store_engine_load(struct device *dev,
542 struct device_attribute *attr,
543 const char *buf, size_t len, int nr)
544{
545 struct i2c_client *client = to_i2c_client(dev);
546 struct lp5523_chip *chip = i2c_get_clientdata(client);
547 return lp5523_do_store_load(&chip->engines[nr - 1], buf, len);
548}
549
550#define store_load(nr) \
551static ssize_t store_engine##nr##_load(struct device *dev, \
552 struct device_attribute *attr, \
553 const char *buf, size_t len) \
554{ \
555 return store_engine_load(dev, attr, buf, len, nr); \
556}
557store_load(1)
558store_load(2)
559store_load(3)
560
561static ssize_t show_engine_mode(struct device *dev,
562 struct device_attribute *attr,
563 char *buf, int nr)
564{
565 struct i2c_client *client = to_i2c_client(dev);
566 struct lp5523_chip *chip = i2c_get_clientdata(client);
567 switch (chip->engines[nr - 1].mode) {
568 case LP5523_CMD_RUN:
569 return sprintf(buf, "run\n");
570 case LP5523_CMD_LOAD:
571 return sprintf(buf, "load\n");
572 case LP5523_CMD_DISABLED:
573 return sprintf(buf, "disabled\n");
574 default:
575 return sprintf(buf, "disabled\n");
576 }
577}
578
579#define show_mode(nr) \
580static ssize_t show_engine##nr##_mode(struct device *dev, \
581 struct device_attribute *attr, \
582 char *buf) \
583{ \
584 return show_engine_mode(dev, attr, buf, nr); \
585}
586show_mode(1)
587show_mode(2)
588show_mode(3)
589
590static ssize_t store_engine_mode(struct device *dev,
591 struct device_attribute *attr,
592 const char *buf, size_t len, int nr)
593{
594 struct i2c_client *client = to_i2c_client(dev);
595 struct lp5523_chip *chip = i2c_get_clientdata(client);
596 struct lp5523_engine *engine = &chip->engines[nr - 1];
597 mutex_lock(&chip->lock);
598
599 if (!strncmp(buf, "run", 3))
600 lp5523_set_mode(engine, LP5523_CMD_RUN);
601 else if (!strncmp(buf, "load", 4))
602 lp5523_set_mode(engine, LP5523_CMD_LOAD);
603 else if (!strncmp(buf, "disabled", 8))
604 lp5523_set_mode(engine, LP5523_CMD_DISABLED);
605
606 mutex_unlock(&chip->lock);
607 return len;
608}
609
610#define store_mode(nr) \
611static ssize_t store_engine##nr##_mode(struct device *dev, \
612 struct device_attribute *attr, \
613 const char *buf, size_t len) \
614{ \
615 return store_engine_mode(dev, attr, buf, len, nr); \
616}
617store_mode(1)
618store_mode(2)
619store_mode(3)
620
621static ssize_t show_max_current(struct device *dev,
622 struct device_attribute *attr,
623 char *buf)
624{
625 struct led_classdev *led_cdev = dev_get_drvdata(dev);
626 struct lp5523_led *led = cdev_to_led(led_cdev);
627
628 return sprintf(buf, "%d\n", led->max_current);
629}
630
631static ssize_t show_current(struct device *dev,
632 struct device_attribute *attr,
633 char *buf)
634{
635 struct led_classdev *led_cdev = dev_get_drvdata(dev);
636 struct lp5523_led *led = cdev_to_led(led_cdev);
637
638 return sprintf(buf, "%d\n", led->led_current);
639}
640
641static ssize_t store_current(struct device *dev,
642 struct device_attribute *attr,
643 const char *buf, size_t len)
644{
645 struct led_classdev *led_cdev = dev_get_drvdata(dev);
646 struct lp5523_led *led = cdev_to_led(led_cdev);
647 struct lp5523_chip *chip = led_to_lp5523(led);
648 ssize_t ret;
649 unsigned long curr;
650
eef4aa65 651 if (kstrtoul(buf, 0, &curr))
0efba16c
SO		 652 return -EINVAL;
653
654 if (curr > led->max_current)
655 return -EINVAL;
656
657 mutex_lock(&chip->lock);
658 ret = lp5523_write(chip->client,
659 LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
660 (u8)curr);
661 mutex_unlock(&chip->lock);
662
663 if (ret < 0)
664 return ret;
665
666 led->led_current = (u8)curr;
667
668 return len;
669}
670
671/* led class device attributes */
ccd7510f 672static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current);
0efba16c
SO		 673static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
674
675static struct attribute *lp5523_led_attributes[] = {
676 &dev_attr_led_current.attr,
677 &dev_attr_max_current.attr,
678 NULL,
679};
680
681static struct attribute_group lp5523_led_attribute_group = {
682 .attrs = lp5523_led_attributes
683};
684
685/* device attributes */
ccd7510f 686static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR,
0efba16c 687 show_engine1_mode, store_engine1_mode);
ccd7510f 688static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR,
0efba16c 689 show_engine2_mode, store_engine2_mode);
ccd7510f 690static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR,
0efba16c 691 show_engine3_mode, store_engine3_mode);
ccd7510f 692static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUSR,
0efba16c 693 show_engine1_leds, store_engine1_leds);
ccd7510f 694static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUSR,
0efba16c 695 show_engine2_leds, store_engine2_leds);
ccd7510f 696static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUSR,
0efba16c 697 show_engine3_leds, store_engine3_leds);
ccd7510f
VK		 698static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load);
699static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load);
700static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load);
0efba16c
SO		 701static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL);
702
703static struct attribute *lp5523_attributes[] = {
704 &dev_attr_engine1_mode.attr,
705 &dev_attr_engine2_mode.attr,
706 &dev_attr_engine3_mode.attr,
707 &dev_attr_selftest.attr,
0efba16c
SO		 708 &dev_attr_engine1_load.attr,
709 &dev_attr_engine1_leds.attr,
0efba16c
SO		 710 &dev_attr_engine2_load.attr,
711 &dev_attr_engine2_leds.attr,
0efba16c
SO		 712 &dev_attr_engine3_load.attr,
713 &dev_attr_engine3_leds.attr,
f1625842 714 NULL,
0efba16c
SO		 715};
716
717static const struct attribute_group lp5523_group = {
718 .attrs = lp5523_attributes,
719};
720
0efba16c
SO		 721static int lp5523_register_sysfs(struct i2c_client *client)
722{
723 struct device *dev = &client->dev;
724 int ret;
725
726 ret = sysfs_create_group(&dev->kobj, &lp5523_group);
727 if (ret < 0)
728 return ret;
729
730 return 0;
731}
732
733static void lp5523_unregister_sysfs(struct i2c_client *client)
734{
735 struct lp5523_chip *chip = i2c_get_clientdata(client);
736 struct device *dev = &client->dev;
737 int i;
738
739 sysfs_remove_group(&dev->kobj, &lp5523_group);
740
0efba16c
SO		 741 for (i = 0; i < chip->num_leds; i++)
742 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
743 &lp5523_led_attribute_group);
744}
745
746/*--------------------------------------------------------------*/
747/* Set chip operating mode */
748/*--------------------------------------------------------------*/
6f6365fb 749static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode)
0efba16c 750{
0efba16c
SO		 751 /* if in that mode already do nothing, except for run */
752 if (mode == engine->mode && mode != LP5523_CMD_RUN)
6f6365fb 753 return;
0efba16c 754
6f6365fb
KM		 755 switch (mode) {
756 case LP5523_CMD_RUN:
757 lp5523_run_program(engine);
758 break;
759 case LP5523_CMD_LOAD:
0efba16c
SO		 760 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
761 lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
6f6365fb
KM		 762 break;
763 case LP5523_CMD_DISABLED:
0efba16c 764 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
6f6365fb
KM		 765 break;
766 default:
767 return;
0efba16c
SO		 768 }
769
0efba16c 770 engine->mode = mode;
0efba16c
SO		 771}
772
773/*--------------------------------------------------------------*/
774/* Probe, Attach, Remove */
775/*--------------------------------------------------------------*/
98ea1ea2 776static int lp5523_init_led(struct lp5523_led *led, struct device *dev,
56a1e9ad
KM		 777 int chan, struct lp5523_platform_data *pdata,
778 const char *chip_name)
0efba16c
SO		 779{
780 char name[32];
781 int res;
782
783 if (chan >= LP5523_LEDS)
784 return -EINVAL;
785
786 if (pdata->led_config[chan].led_current) {
787 led->led_current = pdata->led_config[chan].led_current;
788 led->max_current = pdata->led_config[chan].max_current;
789 led->chan_nr = pdata->led_config[chan].chan_nr;
790
791 if (led->chan_nr >= LP5523_LEDS) {
792 dev_err(dev, "Use channel numbers between 0 and %d\n",
793 LP5523_LEDS - 1);
794 return -EINVAL;
795 }
796
94b43b67
KM		 797 if (pdata->led_config[chan].name) {
798 led->cdev.name = pdata->led_config[chan].name;
799 } else {
800 snprintf(name, sizeof(name), "%s:channel%d",
56a1e9ad 801 pdata->label ? : chip_name, chan);
94b43b67
KM		 802 led->cdev.name = name;
803 }
0efba16c 804
0efba16c
SO		 805 led->cdev.brightness_set = lp5523_set_brightness;
806 res = led_classdev_register(dev, &led->cdev);
807 if (res < 0) {
808 dev_err(dev, "couldn't register led on channel %d\n",
809 chan);
810 return res;
811 }
812 res = sysfs_create_group(&led->cdev.dev->kobj,
813 &lp5523_led_attribute_group);
814 if (res < 0) {
815 dev_err(dev, "couldn't register current attribute\n");
816 led_classdev_unregister(&led->cdev);
817 return res;
818 }
819 } else {
820 led->led_current = 0;
821 }
822 return 0;
823}
824
f6524808
MWK		 825static int lp5523_register_leds(struct lp5523_chip *chip, const char *name)
826{
827 struct lp5523_platform_data *pdata = chip->pdata;
828 struct i2c_client *client = chip->client;
829 int i;
830 int led;
831 int ret;
832
833 /* Initialize leds */
834 chip->num_channels = pdata->num_channels;
835 chip->num_leds = 0;
836 led = 0;
837 for (i = 0; i < pdata->num_channels; i++) {
838 /* Do not initialize channels that are not connected */
839 if (pdata->led_config[i].led_current == 0)
840 continue;
841
842 INIT_WORK(&chip->leds[led].brightness_work,
843 lp5523_led_brightness_work);
844
845 ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata,
846 name);
847 if (ret) {
848 dev_err(&client->dev, "error initializing leds\n");
849 return ret;
850 }
851 chip->num_leds++;
852
853 chip->leds[led].id = led;
854 /* Set LED current */
855 lp5523_write(client,
856 LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
857 chip->leds[led].led_current);
858
859 led++;
860 }
861
862 return 0;
863}
864
1904f83d
MWK		 865static void lp5523_unregister_leds(struct lp5523_chip *chip)
866{
867 int i;
868
869 for (i = 0; i < chip->num_leds; i++) {
870 led_classdev_unregister(&chip->leds[i].cdev);
871 flush_work(&chip->leds[i].brightness_work);
872 }
873}
874
1a991485
MWK		 875static void lp5523_deinit_device(struct lp5523_chip *chip)
876{
877 struct lp5523_platform_data *pdata = chip->pdata;
878
879 if (pdata->enable)
880 pdata->enable(0);
881 if (pdata->release_resources)
882 pdata->release_resources();
883}
884
48068d5d
MWK		 885/* Chip specific configurations */
886static struct lp55xx_device_config lp5523_cfg = {
887 .reset = {
888 .addr = LP5523_REG_RESET,
889 .val = LP5523_RESET,
890 },
e3a700d8
MWK		 891 .enable = {
892 .addr = LP5523_REG_ENABLE,
893 .val = LP5523_ENABLE,
894 },
ffbdccdb 895 .post_init_device = lp5523_post_init_device,
48068d5d
MWK		 896};
897
98ea1ea2 898static int lp5523_probe(struct i2c_client *client,
0efba16c
SO		 899 const struct i2c_device_id *id)
900{
6a0c9a47 901 struct lp5523_chip *old_chip = NULL;
22ebeb48 902 int ret;
6a0c9a47
MWK		 903 struct lp55xx_chip *chip;
904 struct lp55xx_led *led;
905 struct lp55xx_platform_data *pdata = client->dev.platform_data;
0efba16c 906
6a0c9a47 907 if (!pdata) {
0efba16c 908 dev_err(&client->dev, "no platform data\n");
94ca4bcc 909 return -EINVAL;
0efba16c
SO		 910 }
911
6a0c9a47
MWK		 912 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
913 if (!chip)
914 return -ENOMEM;
915
916 led = devm_kzalloc(&client->dev,
917 sizeof(*led) * pdata->num_channels, GFP_KERNEL);
918 if (!led)
919 return -ENOMEM;
920
921 chip->cl = client;
922 chip->pdata = pdata;
48068d5d 923 chip->cfg = &lp5523_cfg;
6a0c9a47
MWK		 924
925 mutex_init(&chip->lock);
0efba16c 926
6a0c9a47 927 i2c_set_clientdata(client, led);
0efba16c 928
22ebeb48 929 ret = lp55xx_init_device(chip);
0efba16c 930 if (ret)
f6c64c6f 931 goto err_init;
0efba16c 932
56a1e9ad 933 dev_info(&client->dev, "%s Programmable led chip found\n", id->name);
0efba16c 934
945c7007 935 ret = lp5523_register_leds(old_chip, id->name);
f6524808
MWK		 936 if (ret)
937 goto fail2;
0efba16c
SO		 938
939 ret = lp5523_register_sysfs(client);
940 if (ret) {
941 dev_err(&client->dev, "registering sysfs failed\n");
94ca4bcc 942 goto fail2;
0efba16c
SO		 943 }
944 return ret;
94ca4bcc 945fail2:
945c7007 946 lp5523_unregister_leds(old_chip);
945c7007 947 lp5523_deinit_device(old_chip);
f6c64c6f 948err_init:
0efba16c
SO		 949 return ret;
950}
951
952static int lp5523_remove(struct i2c_client *client)
953{
945c7007 954 struct lp5523_chip *old_chip = i2c_get_clientdata(client);
0efba16c 955
23301b7f
KM		 956 /* Disable engine mode */
957 lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED);
958
0efba16c
SO		 959 lp5523_unregister_sysfs(client);
960
945c7007 961 lp5523_unregister_leds(old_chip);
0efba16c 962
945c7007 963 lp5523_deinit_device(old_chip);
0efba16c
SO		 964 return 0;
965}
966
967static const struct i2c_device_id lp5523_id[] = {
27d7704e
KM		 968 { "lp5523", LP5523 },
969 { "lp55231", LP55231 },
0efba16c
SO		 970 { }
971};
972
973MODULE_DEVICE_TABLE(i2c, lp5523_id);
974
975static struct i2c_driver lp5523_driver = {
976 .driver = {
27d7704e 977 .name = "lp5523x",
0efba16c
SO		 978 },
979 .probe = lp5523_probe,
980 .remove = lp5523_remove,
981 .id_table = lp5523_id,
982};
983
09a0d183 984module_i2c_driver(lp5523_driver);
0efba16c
SO		 985
986MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
987MODULE_DESCRIPTION("LP5523 LED engine");
988MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)