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drivers/leds/leds-lp5523.c: fix section mismatches
[linux.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 <[email protected]>
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>
37
38#define LP5523_REG_ENABLE 0x00
39#define LP5523_REG_OP_MODE 0x01
40#define LP5523_REG_RATIOMETRIC_MSB 0x02
41#define LP5523_REG_RATIOMETRIC_LSB 0x03
42#define LP5523_REG_ENABLE_LEDS_MSB 0x04
43#define LP5523_REG_ENABLE_LEDS_LSB 0x05
44#define LP5523_REG_LED_CNTRL_BASE 0x06
45#define LP5523_REG_LED_PWM_BASE 0x16
46#define LP5523_REG_LED_CURRENT_BASE 0x26
47#define LP5523_REG_CONFIG 0x36
48#define LP5523_REG_CHANNEL1_PC 0x37
49#define LP5523_REG_CHANNEL2_PC 0x38
50#define LP5523_REG_CHANNEL3_PC 0x39
51#define LP5523_REG_STATUS 0x3a
52#define LP5523_REG_GPO 0x3b
53#define LP5523_REG_VARIABLE 0x3c
54#define LP5523_REG_RESET 0x3d
55#define LP5523_REG_TEMP_CTRL 0x3e
56#define LP5523_REG_TEMP_READ 0x3f
57#define LP5523_REG_TEMP_WRITE 0x40
58#define LP5523_REG_LED_TEST_CTRL 0x41
59#define LP5523_REG_LED_TEST_ADC 0x42
60#define LP5523_REG_ENG1_VARIABLE 0x45
61#define LP5523_REG_ENG2_VARIABLE 0x46
62#define LP5523_REG_ENG3_VARIABLE 0x47
63#define LP5523_REG_MASTER_FADER1 0x48
64#define LP5523_REG_MASTER_FADER2 0x49
65#define LP5523_REG_MASTER_FADER3 0x4a
66#define LP5523_REG_CH1_PROG_START 0x4c
67#define LP5523_REG_CH2_PROG_START 0x4d
68#define LP5523_REG_CH3_PROG_START 0x4e
69#define LP5523_REG_PROG_PAGE_SEL 0x4f
70#define LP5523_REG_PROG_MEM 0x50
71
72#define LP5523_CMD_LOAD 0x15 /* 00010101 */
73#define LP5523_CMD_RUN 0x2a /* 00101010 */
74#define LP5523_CMD_DISABLED 0x00 /* 00000000 */
75
76#define LP5523_ENABLE 0x40
77#define LP5523_AUTO_INC 0x40
78#define LP5523_PWR_SAVE 0x20
79#define LP5523_PWM_PWR_SAVE 0x04
80#define LP5523_CP_1 0x08
81#define LP5523_CP_1_5 0x10
82#define LP5523_CP_AUTO 0x18
83#define LP5523_INT_CLK 0x01
84#define LP5523_AUTO_CLK 0x02
85#define LP5523_EN_LEDTEST 0x80
86#define LP5523_LEDTEST_DONE 0x80
87
88#define LP5523_DEFAULT_CURRENT 50 /* microAmps */
89#define LP5523_PROGRAM_LENGTH 32 /* in bytes */
90#define LP5523_PROGRAM_PAGES 6
91#define LP5523_ADC_SHORTCIRC_LIM 80
92
93#define LP5523_LEDS 9
94#define LP5523_ENGINES 3
95
96#define LP5523_ENG_MASK_BASE 0x30 /* 00110000 */
97
98#define LP5523_ENG_STATUS_MASK 0x07 /* 00000111 */
99
100#define LP5523_IRQ_FLAGS IRQF_TRIGGER_FALLING
101
102#define LP5523_EXT_CLK_USED 0x08
103
104#define LED_ACTIVE(mux, led) (!!(mux & (0x0001 << led)))
105#define SHIFT_MASK(id) (((id) - 1) * 2)
106
107struct lp5523_engine {
0efba16c
SO		 108 int id;
109 u8 mode;
110 u8 prog_page;
111 u8 mux_page;
112 u16 led_mux;
113 u8 engine_mask;
114};
115
116struct lp5523_led {
117 int id;
118 u8 chan_nr;
119 u8 led_current;
120 u8 max_current;
121 struct led_classdev cdev;
122 struct work_struct brightness_work;
123 u8 brightness;
124};
125
126struct lp5523_chip {
127 struct mutex lock; /* Serialize control */
128 struct i2c_client *client;
129 struct lp5523_engine engines[LP5523_ENGINES];
130 struct lp5523_led leds[LP5523_LEDS];
131 struct lp5523_platform_data *pdata;
132 u8 num_channels;
133 u8 num_leds;
134};
135
87dbf623
SO		 136static inline struct lp5523_led *cdev_to_led(struct led_classdev *cdev)
137{
138 return container_of(cdev, struct lp5523_led, cdev);
139}
0efba16c 140
87dbf623 141static inline struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine)
0efba16c
SO		 142{
143 return container_of(engine, struct lp5523_chip,
144 engines[engine->id - 1]);
145}
146
87dbf623 147static inline struct lp5523_chip *led_to_lp5523(struct lp5523_led *led)
0efba16c
SO		 148{
149 return container_of(led, struct lp5523_chip,
150 leds[led->id]);
151}
152
153static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode);
154static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode);
155static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern);
156
157static void lp5523_led_brightness_work(struct work_struct *work);
158
159static int lp5523_write(struct i2c_client *client, u8 reg, u8 value)
160{
161 return i2c_smbus_write_byte_data(client, reg, value);
162}
163
164static int lp5523_read(struct i2c_client *client, u8 reg, u8 *buf)
165{
166 s32 ret = i2c_smbus_read_byte_data(client, reg);
167
168 if (ret < 0)
169 return -EIO;
170
171 *buf = ret;
172 return 0;
173}
174
175static int lp5523_detect(struct i2c_client *client)
176{
177 int ret;
178 u8 buf;
179
180 ret = lp5523_write(client, LP5523_REG_ENABLE, 0x40);
181 if (ret)
182 return ret;
183 ret = lp5523_read(client, LP5523_REG_ENABLE, &buf);
184 if (ret)
185 return ret;
186 if (buf == 0x40)
187 return 0;
188 else
189 return -ENODEV;
190}
191
192static int lp5523_configure(struct i2c_client *client)
193{
194 struct lp5523_chip *chip = i2c_get_clientdata(client);
195 int ret = 0;
196 u8 status;
197
198 /* one pattern per engine setting led mux start and stop addresses */
199 u8 pattern[][LP5523_PROGRAM_LENGTH] = {
200 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
201 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
202 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
203 };
204
0efba16c 205 ret |= lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE);
2e4840ed
SO		 206 /* Chip startup time is 500 us, 1 - 2 ms gives some margin */
207 usleep_range(1000, 2000);
0efba16c
SO		 208
209 ret |= lp5523_write(client, LP5523_REG_CONFIG,
210 LP5523_AUTO_INC | LP5523_PWR_SAVE |
211 LP5523_CP_AUTO | LP5523_AUTO_CLK |
212 LP5523_PWM_PWR_SAVE);
213
214 /* turn on all leds */
215 ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
216 ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
217
218 /* hardcode 32 bytes of memory for each engine from program memory */
219 ret |= lp5523_write(client, LP5523_REG_CH1_PROG_START, 0x00);
220 ret |= lp5523_write(client, LP5523_REG_CH2_PROG_START, 0x10);
221 ret |= lp5523_write(client, LP5523_REG_CH3_PROG_START, 0x20);
222
223 /* write led mux address space for each channel */
224 ret |= lp5523_load_program(&chip->engines[0], pattern[0]);
225 ret |= lp5523_load_program(&chip->engines[1], pattern[1]);
226 ret |= lp5523_load_program(&chip->engines[2], pattern[2]);
227
228 if (ret) {
229 dev_err(&client->dev, "could not load mux programs\n");
230 return -1;
231 }
232
233 /* set all engines exec state and mode to run 00101010 */
234 ret |= lp5523_write(client, LP5523_REG_ENABLE,
235 (LP5523_CMD_RUN | LP5523_ENABLE));
236
237 ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_RUN);
238
239 if (ret) {
240 dev_err(&client->dev, "could not start mux programs\n");
241 return -1;
242 }
243
2e4840ed
SO		 244 /* Let the programs run for couple of ms and check the engine status */
245 usleep_range(3000, 6000);
0efba16c
SO		 246 lp5523_read(client, LP5523_REG_STATUS, &status);
247 status &= LP5523_ENG_STATUS_MASK;
248
249 if (status == LP5523_ENG_STATUS_MASK) {
250 dev_dbg(&client->dev, "all engines configured\n");
251 } else {
252 dev_info(&client->dev, "status == %x\n", status);
253 dev_err(&client->dev, "cound not configure LED engine\n");
254 return -1;
255 }
256
257 dev_info(&client->dev, "disabling engines\n");
258
259 ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED);
260
261 return ret;
262}
263
264static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode)
265{
266 struct lp5523_chip *chip = engine_to_lp5523(engine);
267 struct i2c_client *client = chip->client;
268 int ret;
269 u8 engine_state;
270
271 ret = lp5523_read(client, LP5523_REG_OP_MODE, &engine_state);
272 if (ret)
273 goto fail;
274
275 engine_state &= ~(engine->engine_mask);
276
277 /* set mode only for this engine */
278 mode &= engine->engine_mask;
279
280 engine_state |= mode;
281
282 ret |= lp5523_write(client, LP5523_REG_OP_MODE, engine_state);
283fail:
284 return ret;
285}
286
287static int lp5523_load_mux(struct lp5523_engine *engine, u16 mux)
288{
289 struct lp5523_chip *chip = engine_to_lp5523(engine);
290 struct i2c_client *client = chip->client;
291 int ret = 0;
292
293 ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
294
295 ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, engine->mux_page);
296 ret |= lp5523_write(client, LP5523_REG_PROG_MEM,
297 (u8)(mux >> 8));
298 ret |= lp5523_write(client, LP5523_REG_PROG_MEM + 1, (u8)(mux));
299 engine->led_mux = mux;
300
301 return ret;
302}
303
304static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern)
305{
306 struct lp5523_chip *chip = engine_to_lp5523(engine);
307 struct i2c_client *client = chip->client;
308
309 int ret = 0;
310
311 ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
312
313 ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL,
314 engine->prog_page);
315 ret |= i2c_smbus_write_i2c_block_data(client, LP5523_REG_PROG_MEM,
316 LP5523_PROGRAM_LENGTH, pattern);
317
318 return ret;
319}
320
321static int lp5523_run_program(struct lp5523_engine *engine)
322{
323 struct lp5523_chip *chip = engine_to_lp5523(engine);
324 struct i2c_client *client = chip->client;
325 int ret;
326
327 ret = lp5523_write(client, LP5523_REG_ENABLE,
328 LP5523_CMD_RUN | LP5523_ENABLE);
329 if (ret)
330 goto fail;
331
332 ret = lp5523_set_engine_mode(engine, LP5523_CMD_RUN);
333fail:
334 return ret;
335}
336
337static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
338{
339 int i;
340 u16 tmp_mux = 0;
341 len = len < LP5523_LEDS ? len : LP5523_LEDS;
342 for (i = 0; i < len; i++) {
343 switch (buf[i]) {
344 case '1':
345 tmp_mux |= (1 << i);
346 break;
347 case '0':
348 break;
349 case '\n':
350 i = len;
351 break;
352 default:
353 return -1;
354 }
355 }
356 *mux = tmp_mux;
357
358 return 0;
359}
360
361static void lp5523_mux_to_array(u16 led_mux, char *array)
362{
363 int i, pos = 0;
364 for (i = 0; i < LP5523_LEDS; i++)
365 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
366
367 array[pos] = '\0';
368}
369
370/*--------------------------------------------------------------*/
371/* Sysfs interface */
372/*--------------------------------------------------------------*/
373
374static ssize_t show_engine_leds(struct device *dev,
375 struct device_attribute *attr,
376 char *buf, int nr)
377{
378 struct i2c_client *client = to_i2c_client(dev);
379 struct lp5523_chip *chip = i2c_get_clientdata(client);
380 char mux[LP5523_LEDS + 1];
381
382 lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
383
384 return sprintf(buf, "%s\n", mux);
385}
386
387#define show_leds(nr) \
388static ssize_t show_engine##nr##_leds(struct device *dev, \
389 struct device_attribute *attr, \
390 char *buf) \
391{ \
392 return show_engine_leds(dev, attr, buf, nr); \
393}
394show_leds(1)
395show_leds(2)
396show_leds(3)
397
398static ssize_t store_engine_leds(struct device *dev,
399 struct device_attribute *attr,
400 const char *buf, size_t len, int nr)
401{
402 struct i2c_client *client = to_i2c_client(dev);
403 struct lp5523_chip *chip = i2c_get_clientdata(client);
404 u16 mux = 0;
fbac0812 405 ssize_t ret;
0efba16c
SO		 406
407 if (lp5523_mux_parse(buf, &mux, len))
408 return -EINVAL;
409
fbac0812
SO		 410 mutex_lock(&chip->lock);
411 ret = -EINVAL;
412 if (chip->engines[nr - 1].mode != LP5523_CMD_LOAD)
413 goto leave;
414
0efba16c 415 if (lp5523_load_mux(&chip->engines[nr - 1], mux))
fbac0812 416 goto leave;
0efba16c 417
fbac0812
SO		 418 ret = len;
419leave:
420 mutex_unlock(&chip->lock);
421 return ret;
0efba16c
SO		 422}
423
424#define store_leds(nr) \
425static ssize_t store_engine##nr##_leds(struct device *dev, \
426 struct device_attribute *attr, \
427 const char *buf, size_t len) \
428{ \
429 return store_engine_leds(dev, attr, buf, len, nr); \
430}
431store_leds(1)
432store_leds(2)
433store_leds(3)
434
435static ssize_t lp5523_selftest(struct device *dev,
436 struct device_attribute *attr,
437 char *buf)
438{
439 struct i2c_client *client = to_i2c_client(dev);
440 struct lp5523_chip *chip = i2c_get_clientdata(client);
441 int i, ret, pos = 0;
442 int led = 0;
443 u8 status, adc, vdd;
444
445 mutex_lock(&chip->lock);
446
447 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
448 if (ret < 0)
449 goto fail;
450
451 /* Check that ext clock is really in use if requested */
452 if ((chip->pdata) && (chip->pdata->clock_mode == LP5523_CLOCK_EXT))
453 if ((status & LP5523_EXT_CLK_USED) == 0)
454 goto fail;
455
456 /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
457 lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL,
458 LP5523_EN_LEDTEST | 16);
2e4840ed 459 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
0efba16c
SO		 460 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
461 if (!(status & LP5523_LEDTEST_DONE))
2e4840ed 462 usleep_range(3000, 6000); /* Was not ready. Wait little bit */
0efba16c
SO		 463
464 ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd);
465 vdd--; /* There may be some fluctuation in measurement */
466
467 for (i = 0; i < LP5523_LEDS; i++) {
468 /* Skip non-existing channels */
469 if (chip->pdata->led_config[i].led_current == 0)
470 continue;
471
472 /* Set default current */
473 lp5523_write(chip->client,
474 LP5523_REG_LED_CURRENT_BASE + i,
475 chip->pdata->led_config[i].led_current);
476
477 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff);
2e4840ed
SO		 478 /* let current stabilize 2 - 4ms before measurements start */
479 usleep_range(2000, 4000);
0efba16c
SO		 480 lp5523_write(chip->client,
481 LP5523_REG_LED_TEST_CTRL,
482 LP5523_EN_LEDTEST | i);
2e4840ed
SO		 483 /* ADC conversion time is 2.7 ms typically */
484 usleep_range(3000, 6000);
0efba16c
SO		 485 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
486 if (!(status & LP5523_LEDTEST_DONE))
2e4840ed 487 usleep_range(3000, 6000);/* Was not ready. Wait. */
0efba16c
SO		 488 ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc);
489
490 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
491 pos += sprintf(buf + pos, "LED %d FAIL\n", i);
492
493 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00);
494
495 /* Restore current */
496 lp5523_write(chip->client,
497 LP5523_REG_LED_CURRENT_BASE + i,
498 chip->leds[led].led_current);
499 led++;
500 }
501 if (pos == 0)
502 pos = sprintf(buf, "OK\n");
503 goto release_lock;
504fail:
505 pos = sprintf(buf, "FAIL\n");
506
507release_lock:
508 mutex_unlock(&chip->lock);
509
510 return pos;
511}
512
513static void lp5523_set_brightness(struct led_classdev *cdev,
514 enum led_brightness brightness)
515{
516 struct lp5523_led *led = cdev_to_led(cdev);
517
518 led->brightness = (u8)brightness;
519
520 schedule_work(&led->brightness_work);
521}
522
523static void lp5523_led_brightness_work(struct work_struct *work)
524{
525 struct lp5523_led *led = container_of(work,
526 struct lp5523_led,
527 brightness_work);
528 struct lp5523_chip *chip = led_to_lp5523(led);
529 struct i2c_client *client = chip->client;
530
531 mutex_lock(&chip->lock);
532
533 lp5523_write(client, LP5523_REG_LED_PWM_BASE + led->chan_nr,
534 led->brightness);
535
536 mutex_unlock(&chip->lock);
537}
538
539static int lp5523_do_store_load(struct lp5523_engine *engine,
540 const char *buf, size_t len)
541{
542 struct lp5523_chip *chip = engine_to_lp5523(engine);
543 struct i2c_client *client = chip->client;
544 int ret, nrchars, offset = 0, i = 0;
545 char c[3];
546 unsigned cmd;
547 u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
548
549 while ((offset < len - 1) && (i < LP5523_PROGRAM_LENGTH)) {
550 /* separate sscanfs because length is working only for %s */
551 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
552 ret = sscanf(c, "%2x", &cmd);
553 if (ret != 1)
554 goto fail;
555 pattern[i] = (u8)cmd;
556
557 offset += nrchars;
558 i++;
559 }
560
561 /* Each instruction is 16bit long. Check that length is even */
562 if (i % 2)
563 goto fail;
564
565 mutex_lock(&chip->lock);
566
fbac0812
SO		 567 if (engine->mode == LP5523_CMD_LOAD)
568 ret = lp5523_load_program(engine, pattern);
569 else
570 ret = -EINVAL;
571
0efba16c
SO		 572 mutex_unlock(&chip->lock);
573
574 if (ret) {
575 dev_err(&client->dev, "failed loading pattern\n");
576 return ret;
577 }
578
579 return len;
580fail:
581 dev_err(&client->dev, "wrong pattern format\n");
582 return -EINVAL;
583}
584
585static ssize_t store_engine_load(struct device *dev,
586 struct device_attribute *attr,
587 const char *buf, size_t len, int nr)
588{
589 struct i2c_client *client = to_i2c_client(dev);
590 struct lp5523_chip *chip = i2c_get_clientdata(client);
591 return lp5523_do_store_load(&chip->engines[nr - 1], buf, len);
592}
593
594#define store_load(nr) \
595static ssize_t store_engine##nr##_load(struct device *dev, \
596 struct device_attribute *attr, \
597 const char *buf, size_t len) \
598{ \
599 return store_engine_load(dev, attr, buf, len, nr); \
600}
601store_load(1)
602store_load(2)
603store_load(3)
604
605static ssize_t show_engine_mode(struct device *dev,
606 struct device_attribute *attr,
607 char *buf, int nr)
608{
609 struct i2c_client *client = to_i2c_client(dev);
610 struct lp5523_chip *chip = i2c_get_clientdata(client);
611 switch (chip->engines[nr - 1].mode) {
612 case LP5523_CMD_RUN:
613 return sprintf(buf, "run\n");
614 case LP5523_CMD_LOAD:
615 return sprintf(buf, "load\n");
616 case LP5523_CMD_DISABLED:
617 return sprintf(buf, "disabled\n");
618 default:
619 return sprintf(buf, "disabled\n");
620 }
621}
622
623#define show_mode(nr) \
624static ssize_t show_engine##nr##_mode(struct device *dev, \
625 struct device_attribute *attr, \
626 char *buf) \
627{ \
628 return show_engine_mode(dev, attr, buf, nr); \
629}
630show_mode(1)
631show_mode(2)
632show_mode(3)
633
634static ssize_t store_engine_mode(struct device *dev,
635 struct device_attribute *attr,
636 const char *buf, size_t len, int nr)
637{
638 struct i2c_client *client = to_i2c_client(dev);
639 struct lp5523_chip *chip = i2c_get_clientdata(client);
640 struct lp5523_engine *engine = &chip->engines[nr - 1];
641 mutex_lock(&chip->lock);
642
643 if (!strncmp(buf, "run", 3))
644 lp5523_set_mode(engine, LP5523_CMD_RUN);
645 else if (!strncmp(buf, "load", 4))
646 lp5523_set_mode(engine, LP5523_CMD_LOAD);
647 else if (!strncmp(buf, "disabled", 8))
648 lp5523_set_mode(engine, LP5523_CMD_DISABLED);
649
650 mutex_unlock(&chip->lock);
651 return len;
652}
653
654#define store_mode(nr) \
655static ssize_t store_engine##nr##_mode(struct device *dev, \
656 struct device_attribute *attr, \
657 const char *buf, size_t len) \
658{ \
659 return store_engine_mode(dev, attr, buf, len, nr); \
660}
661store_mode(1)
662store_mode(2)
663store_mode(3)
664
665static ssize_t show_max_current(struct device *dev,
666 struct device_attribute *attr,
667 char *buf)
668{
669 struct led_classdev *led_cdev = dev_get_drvdata(dev);
670 struct lp5523_led *led = cdev_to_led(led_cdev);
671
672 return sprintf(buf, "%d\n", led->max_current);
673}
674
675static ssize_t show_current(struct device *dev,
676 struct device_attribute *attr,
677 char *buf)
678{
679 struct led_classdev *led_cdev = dev_get_drvdata(dev);
680 struct lp5523_led *led = cdev_to_led(led_cdev);
681
682 return sprintf(buf, "%d\n", led->led_current);
683}
684
685static ssize_t store_current(struct device *dev,
686 struct device_attribute *attr,
687 const char *buf, size_t len)
688{
689 struct led_classdev *led_cdev = dev_get_drvdata(dev);
690 struct lp5523_led *led = cdev_to_led(led_cdev);
691 struct lp5523_chip *chip = led_to_lp5523(led);
692 ssize_t ret;
693 unsigned long curr;
694
695 if (strict_strtoul(buf, 0, &curr))
696 return -EINVAL;
697
698 if (curr > led->max_current)
699 return -EINVAL;
700
701 mutex_lock(&chip->lock);
702 ret = lp5523_write(chip->client,
703 LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
704 (u8)curr);
705 mutex_unlock(&chip->lock);
706
707 if (ret < 0)
708 return ret;
709
710 led->led_current = (u8)curr;
711
712 return len;
713}
714
715/* led class device attributes */
ccd7510f 716static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current);
0efba16c
SO		 717static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
718
719static struct attribute *lp5523_led_attributes[] = {
720 &dev_attr_led_current.attr,
721 &dev_attr_max_current.attr,
722 NULL,
723};
724
725static struct attribute_group lp5523_led_attribute_group = {
726 .attrs = lp5523_led_attributes
727};
728
729/* device attributes */
ccd7510f 730static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR,
0efba16c 731 show_engine1_mode, store_engine1_mode);
ccd7510f 732static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR,
0efba16c 733 show_engine2_mode, store_engine2_mode);
ccd7510f 734static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR,
0efba16c 735 show_engine3_mode, store_engine3_mode);
ccd7510f 736static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUSR,
0efba16c 737 show_engine1_leds, store_engine1_leds);
ccd7510f 738static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUSR,
0efba16c 739 show_engine2_leds, store_engine2_leds);
ccd7510f 740static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUSR,
0efba16c 741 show_engine3_leds, store_engine3_leds);
ccd7510f
VK		 742static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load);
743static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load);
744static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load);
0efba16c
SO		 745static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL);
746
747static struct attribute *lp5523_attributes[] = {
748 &dev_attr_engine1_mode.attr,
749 &dev_attr_engine2_mode.attr,
750 &dev_attr_engine3_mode.attr,
751 &dev_attr_selftest.attr,
0efba16c
SO		 752 &dev_attr_engine1_load.attr,
753 &dev_attr_engine1_leds.attr,
0efba16c
SO		 754 &dev_attr_engine2_load.attr,
755 &dev_attr_engine2_leds.attr,
0efba16c
SO		 756 &dev_attr_engine3_load.attr,
757 &dev_attr_engine3_leds.attr,
0efba16c
SO		 758};
759
760static const struct attribute_group lp5523_group = {
761 .attrs = lp5523_attributes,
762};
763
0efba16c
SO		 764static int lp5523_register_sysfs(struct i2c_client *client)
765{
766 struct device *dev = &client->dev;
767 int ret;
768
769 ret = sysfs_create_group(&dev->kobj, &lp5523_group);
770 if (ret < 0)
771 return ret;
772
773 return 0;
774}
775
776static void lp5523_unregister_sysfs(struct i2c_client *client)
777{
778 struct lp5523_chip *chip = i2c_get_clientdata(client);
779 struct device *dev = &client->dev;
780 int i;
781
782 sysfs_remove_group(&dev->kobj, &lp5523_group);
783
0efba16c
SO		 784 for (i = 0; i < chip->num_leds; i++)
785 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
786 &lp5523_led_attribute_group);
787}
788
789/*--------------------------------------------------------------*/
790/* Set chip operating mode */
791/*--------------------------------------------------------------*/
792static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode)
793{
0efba16c
SO		 794 int ret = 0;
795
796 /* if in that mode already do nothing, except for run */
797 if (mode == engine->mode && mode != LP5523_CMD_RUN)
798 return 0;
799
800 if (mode == LP5523_CMD_RUN) {
801 ret = lp5523_run_program(engine);
802 } else if (mode == LP5523_CMD_LOAD) {
803 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
804 lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
0efba16c
SO		 805 } else if (mode == LP5523_CMD_DISABLED) {
806 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
807 }
808
0efba16c
SO		 809 engine->mode = mode;
810
811 return ret;
812}
813
814/*--------------------------------------------------------------*/
815/* Probe, Attach, Remove */
816/*--------------------------------------------------------------*/
817static int __init lp5523_init_engine(struct lp5523_engine *engine, int id)
818{
819 if (id < 1 || id > LP5523_ENGINES)
820 return -1;
821 engine->id = id;
822 engine->engine_mask = LP5523_ENG_MASK_BASE >> SHIFT_MASK(id);
823 engine->prog_page = id - 1;
824 engine->mux_page = id + 2;
0efba16c
SO		 825
826 return 0;
827}
828
33721bd3 829static int __devinit lp5523_init_led(struct lp5523_led *led, struct device *dev,
0efba16c
SO		 830 int chan, struct lp5523_platform_data *pdata)
831{
832 char name[32];
833 int res;
834
835 if (chan >= LP5523_LEDS)
836 return -EINVAL;
837
838 if (pdata->led_config[chan].led_current) {
839 led->led_current = pdata->led_config[chan].led_current;
840 led->max_current = pdata->led_config[chan].max_current;
841 led->chan_nr = pdata->led_config[chan].chan_nr;
842
843 if (led->chan_nr >= LP5523_LEDS) {
844 dev_err(dev, "Use channel numbers between 0 and %d\n",
845 LP5523_LEDS - 1);
846 return -EINVAL;
847 }
848
278ad4fd
SO		 849 snprintf(name, sizeof(name), "%s:channel%d",
850 pdata->label ?: "lp5523", chan);
0efba16c
SO		 851
852 led->cdev.name = name;
853 led->cdev.brightness_set = lp5523_set_brightness;
854 res = led_classdev_register(dev, &led->cdev);
855 if (res < 0) {
856 dev_err(dev, "couldn't register led on channel %d\n",
857 chan);
858 return res;
859 }
860 res = sysfs_create_group(&led->cdev.dev->kobj,
861 &lp5523_led_attribute_group);
862 if (res < 0) {
863 dev_err(dev, "couldn't register current attribute\n");
864 led_classdev_unregister(&led->cdev);
865 return res;
866 }
867 } else {
868 led->led_current = 0;
869 }
870 return 0;
871}
872
873static struct i2c_driver lp5523_driver;
874
33721bd3 875static int __devinit lp5523_probe(struct i2c_client *client,
0efba16c
SO		 876 const struct i2c_device_id *id)
877{
878 struct lp5523_chip *chip;
879 struct lp5523_platform_data *pdata;
880 int ret, i, led;
881
882 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
883 if (!chip)
884 return -ENOMEM;
885
886 i2c_set_clientdata(client, chip);
887 chip->client = client;
888
889 pdata = client->dev.platform_data;
890
891 if (!pdata) {
892 dev_err(&client->dev, "no platform data\n");
893 ret = -EINVAL;
894 goto fail1;
895 }
896
897 mutex_init(&chip->lock);
898
899 chip->pdata = pdata;
900
901 if (pdata->setup_resources) {
902 ret = pdata->setup_resources();
903 if (ret < 0)
904 goto fail1;
905 }
906
907 if (pdata->enable) {
908 pdata->enable(0);
2e4840ed 909 usleep_range(1000, 2000); /* Keep enable down at least 1ms */
0efba16c 910 pdata->enable(1);
2e4840ed 911 usleep_range(1000, 2000); /* 500us abs min. */
0efba16c
SO		 912 }
913
11e7946f
SO		 914 lp5523_write(client, LP5523_REG_RESET, 0xff);
915 usleep_range(10000, 20000); /*
916 * Exact value is not available. 10 - 20ms
917 * appears to be enough for reset.
918 */
0efba16c
SO		 919 ret = lp5523_detect(client);
920 if (ret)
921 goto fail2;
922
923 dev_info(&client->dev, "LP5523 Programmable led chip found\n");
924
925 /* Initialize engines */
926 for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
927 ret = lp5523_init_engine(&chip->engines[i], i + 1);
928 if (ret) {
929 dev_err(&client->dev, "error initializing engine\n");
930 goto fail2;
931 }
932 }
933 ret = lp5523_configure(client);
934 if (ret < 0) {
935 dev_err(&client->dev, "error configuring chip\n");
936 goto fail2;
937 }
938
939 /* Initialize leds */
940 chip->num_channels = pdata->num_channels;
941 chip->num_leds = 0;
942 led = 0;
943 for (i = 0; i < pdata->num_channels; i++) {
944 /* Do not initialize channels that are not connected */
945 if (pdata->led_config[i].led_current == 0)
946 continue;
947
948 ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata);
949 if (ret) {
950 dev_err(&client->dev, "error initializing leds\n");
951 goto fail3;
952 }
953 chip->num_leds++;
954
955 chip->leds[led].id = led;
956 /* Set LED current */
957 lp5523_write(client,
958 LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
959 chip->leds[led].led_current);
960
961 INIT_WORK(&(chip->leds[led].brightness_work),
962 lp5523_led_brightness_work);
963
964 led++;
965 }
966
967 ret = lp5523_register_sysfs(client);
968 if (ret) {
969 dev_err(&client->dev, "registering sysfs failed\n");
970 goto fail3;
971 }
972 return ret;
973fail3:
974 for (i = 0; i < chip->num_leds; i++) {
975 led_classdev_unregister(&chip->leds[i].cdev);
976 cancel_work_sync(&chip->leds[i].brightness_work);
977 }
978fail2:
979 if (pdata->enable)
980 pdata->enable(0);
981 if (pdata->release_resources)
982 pdata->release_resources();
983fail1:
984 kfree(chip);
985 return ret;
986}
987
988static int lp5523_remove(struct i2c_client *client)
989{
990 struct lp5523_chip *chip = i2c_get_clientdata(client);
991 int i;
992
993 lp5523_unregister_sysfs(client);
994
995 for (i = 0; i < chip->num_leds; i++) {
996 led_classdev_unregister(&chip->leds[i].cdev);
997 cancel_work_sync(&chip->leds[i].brightness_work);
998 }
999
1000 if (chip->pdata->enable)
1001 chip->pdata->enable(0);
1002 if (chip->pdata->release_resources)
1003 chip->pdata->release_resources();
1004 kfree(chip);
1005 return 0;
1006}
1007
1008static const struct i2c_device_id lp5523_id[] = {
1009 { "lp5523", 0 },
1010 { }
1011};
1012
1013MODULE_DEVICE_TABLE(i2c, lp5523_id);
1014
1015static struct i2c_driver lp5523_driver = {
1016 .driver = {
1017 .name = "lp5523",
1018 },
1019 .probe = lp5523_probe,
1020 .remove = lp5523_remove,
1021 .id_table = lp5523_id,
1022};
1023
1024static int __init lp5523_init(void)
1025{
1026 int ret;
1027
1028 ret = i2c_add_driver(&lp5523_driver);
1029
1030 if (ret < 0)
1031 printk(KERN_ALERT "Adding lp5523 driver failed\n");
1032
1033 return ret;
1034}
1035
1036static void __exit lp5523_exit(void)
1037{
1038 i2c_del_driver(&lp5523_driver);
1039}
1040
1041module_init(lp5523_init);
1042module_exit(lp5523_exit);
1043
1044MODULE_AUTHOR("Mathias Nyman <[email protected]>");
1045MODULE_DESCRIPTION("LP5523 LED engine");
1046MODULE_LICENSE("GPL");
Empty description
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