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[pohmelfs.git] / drivers / leds / leds-lp5523.c
blob73e791ae725993e1833f40cc8b0b059a0a55b53e
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>
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
107 struct lp5523_engine {
108 int id;
109 u8 mode;
110 u8 prog_page;
111 u8 mux_page;
112 u16 led_mux;
113 u8 engine_mask;
114 };
115
116 struct 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
126 struct 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
136 static inline struct lp5523_led *cdev_to_led(struct led_classdev *cdev)
137 {
138 return container_of(cdev, struct lp5523_led, cdev);
139 }
140
141 static inline struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine)
142 {
143 return container_of(engine, struct lp5523_chip,
144 engines[engine->id - 1]);
145 }
146
147 static inline struct lp5523_chip *led_to_lp5523(struct lp5523_led *led)
148 {
149 return container_of(led, struct lp5523_chip,
150 leds[led->id]);
151 }
152
153 static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode);
154 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode);
155 static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern);
156
157 static void lp5523_led_brightness_work(struct work_struct *work);
158
159 static int lp5523_write(struct i2c_client *client, u8 reg, u8 value)
160 {
161 return i2c_smbus_write_byte_data(client, reg, value);
162 }
163
164 static 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
175 static 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
192 static 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
205 ret |= lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE);
206 /* Chip startup time is 500 us, 1 - 2 ms gives some margin */
207 usleep_range(1000, 2000);
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
244 /* Let the programs run for couple of ms and check the engine status */
245 usleep_range(3000, 6000);
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
264 static 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);
283 fail:
284 return ret;
285 }
286
287 static 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
304 static 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
321 static 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);
333 fail:
334 return ret;
335 }
336
337 static 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
361 static 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
374 static 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) \
388 static 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 }
394 show_leds(1)
395 show_leds(2)
396 show_leds(3)
397
398 static 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;
405 ssize_t ret;
406
407 if (lp5523_mux_parse(buf, &mux, len))
408 return -EINVAL;
409
410 mutex_lock(&chip->lock);
411 ret = -EINVAL;
412 if (chip->engines[nr - 1].mode != LP5523_CMD_LOAD)
413 goto leave;
414
415 if (lp5523_load_mux(&chip->engines[nr - 1], mux))
416 goto leave;
417
418 ret = len;
419 leave:
420 mutex_unlock(&chip->lock);
421 return ret;
422 }
423
424 #define store_leds(nr) \
425 static 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 }
431 store_leds(1)
432 store_leds(2)
433 store_leds(3)
434
435 static 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);
459 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
460 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
461 if (!(status & LP5523_LEDTEST_DONE))
462 usleep_range(3000, 6000); /* Was not ready. Wait little bit */
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);
478 /* let current stabilize 2 - 4ms before measurements start */
479 usleep_range(2000, 4000);
480 lp5523_write(chip->client,
481 LP5523_REG_LED_TEST_CTRL,
482 LP5523_EN_LEDTEST | i);
483 /* ADC conversion time is 2.7 ms typically */
484 usleep_range(3000, 6000);
485 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
486 if (!(status & LP5523_LEDTEST_DONE))
487 usleep_range(3000, 6000);/* Was not ready. Wait. */
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;
504 fail:
505 pos = sprintf(buf, "FAIL\n");
506
507 release_lock:
508 mutex_unlock(&chip->lock);
509
510 return pos;
511 }
512
513 static 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
523 static 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
539 static 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
567 if (engine->mode == LP5523_CMD_LOAD)
568 ret = lp5523_load_program(engine, pattern);
569 else
570 ret = -EINVAL;
571
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;
580 fail:
581 dev_err(&client->dev, "wrong pattern format\n");
582 return -EINVAL;
583 }
584
585 static 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) \
595 static 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 }
601 store_load(1)
602 store_load(2)
603 store_load(3)
604
605 static 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) \
624 static 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 }
630 show_mode(1)
631 show_mode(2)
632 show_mode(3)
633
634 static 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) \
655 static 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 }
661 store_mode(1)
662 store_mode(2)
663 store_mode(3)
664
665 static 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
675 static 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
685 static 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 */
716 static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current);
717 static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
718
719 static struct attribute *lp5523_led_attributes[] = {
720 &dev_attr_led_current.attr,
721 &dev_attr_max_current.attr,
722 NULL,
723 };
724
725 static struct attribute_group lp5523_led_attribute_group = {
726 .attrs = lp5523_led_attributes
727 };
728
729 /* device attributes */
730 static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR,
731 show_engine1_mode, store_engine1_mode);
732 static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR,
733 show_engine2_mode, store_engine2_mode);
734 static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR,
735 show_engine3_mode, store_engine3_mode);
736 static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUSR,
737 show_engine1_leds, store_engine1_leds);
738 static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUSR,
739 show_engine2_leds, store_engine2_leds);
740 static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUSR,
741 show_engine3_leds, store_engine3_leds);
742 static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load);
743 static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load);
744 static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load);
745 static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL);
746
747 static 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,
752 &dev_attr_engine1_load.attr,
753 &dev_attr_engine1_leds.attr,
754 &dev_attr_engine2_load.attr,
755 &dev_attr_engine2_leds.attr,
756 &dev_attr_engine3_load.attr,
757 &dev_attr_engine3_leds.attr,
758 };
759
760 static const struct attribute_group lp5523_group = {
761 .attrs = lp5523_attributes,
762 };
763
764 static 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
776 static 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
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 /*--------------------------------------------------------------*/
792 static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode)
793 {
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);
805 } else if (mode == LP5523_CMD_DISABLED) {
806 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
807 }
808
809 engine->mode = mode;
810
811 return ret;
812 }
813
814 /*--------------------------------------------------------------*/
815 /* Probe, Attach, Remove */
816 /*--------------------------------------------------------------*/
817 static 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;
825
826 return 0;
827 }
828
829 static int __devinit lp5523_init_led(struct lp5523_led *led, struct device *dev,
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
849 snprintf(name, sizeof(name), "%s:channel%d",
850 pdata->label ?: "lp5523", chan);
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
873 static int __devinit lp5523_probe(struct i2c_client *client,
874 const struct i2c_device_id *id)
875 {
876 struct lp5523_chip *chip;
877 struct lp5523_platform_data *pdata;
878 int ret, i, led;
879
880 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
881 if (!chip)
882 return -ENOMEM;
883
884 i2c_set_clientdata(client, chip);
885 chip->client = client;
886
887 pdata = client->dev.platform_data;
888
889 if (!pdata) {
890 dev_err(&client->dev, "no platform data\n");
891 ret = -EINVAL;
892 goto fail1;
893 }
894
895 mutex_init(&chip->lock);
896
897 chip->pdata = pdata;
898
899 if (pdata->setup_resources) {
900 ret = pdata->setup_resources();
901 if (ret < 0)
902 goto fail1;
903 }
904
905 if (pdata->enable) {
906 pdata->enable(0);
907 usleep_range(1000, 2000); /* Keep enable down at least 1ms */
908 pdata->enable(1);
909 usleep_range(1000, 2000); /* 500us abs min. */
910 }
911
912 lp5523_write(client, LP5523_REG_RESET, 0xff);
913 usleep_range(10000, 20000); /*
914 * Exact value is not available. 10 - 20ms
915 * appears to be enough for reset.
916 */
917 ret = lp5523_detect(client);
918 if (ret)
919 goto fail2;
920
921 dev_info(&client->dev, "LP5523 Programmable led chip found\n");
922
923 /* Initialize engines */
924 for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
925 ret = lp5523_init_engine(&chip->engines[i], i + 1);
926 if (ret) {
927 dev_err(&client->dev, "error initializing engine\n");
928 goto fail2;
929 }
930 }
931 ret = lp5523_configure(client);
932 if (ret < 0) {
933 dev_err(&client->dev, "error configuring chip\n");
934 goto fail2;
935 }
936
937 /* Initialize leds */
938 chip->num_channels = pdata->num_channels;
939 chip->num_leds = 0;
940 led = 0;
941 for (i = 0; i < pdata->num_channels; i++) {
942 /* Do not initialize channels that are not connected */
943 if (pdata->led_config[i].led_current == 0)
944 continue;
945
946 ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata);
947 if (ret) {
948 dev_err(&client->dev, "error initializing leds\n");
949 goto fail3;
950 }
951 chip->num_leds++;
952
953 chip->leds[led].id = led;
954 /* Set LED current */
955 lp5523_write(client,
956 LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
957 chip->leds[led].led_current);
958
959 INIT_WORK(&(chip->leds[led].brightness_work),
960 lp5523_led_brightness_work);
961
962 led++;
963 }
964
965 ret = lp5523_register_sysfs(client);
966 if (ret) {
967 dev_err(&client->dev, "registering sysfs failed\n");
968 goto fail3;
969 }
970 return ret;
971 fail3:
972 for (i = 0; i < chip->num_leds; i++) {
973 led_classdev_unregister(&chip->leds[i].cdev);
974 cancel_work_sync(&chip->leds[i].brightness_work);
975 }
976 fail2:
977 if (pdata->enable)
978 pdata->enable(0);
979 if (pdata->release_resources)
980 pdata->release_resources();
981 fail1:
982 kfree(chip);
983 return ret;
984 }
985
986 static int lp5523_remove(struct i2c_client *client)
987 {
988 struct lp5523_chip *chip = i2c_get_clientdata(client);
989 int i;
990
991 lp5523_unregister_sysfs(client);
992
993 for (i = 0; i < chip->num_leds; i++) {
994 led_classdev_unregister(&chip->leds[i].cdev);
995 cancel_work_sync(&chip->leds[i].brightness_work);
996 }
997
998 if (chip->pdata->enable)
999 chip->pdata->enable(0);
1000 if (chip->pdata->release_resources)
1001 chip->pdata->release_resources();
1002 kfree(chip);
1003 return 0;
1004 }
1005
1006 static const struct i2c_device_id lp5523_id[] = {
1007 { "lp5523", 0 },
1008 { }
1009 };
1010
1011 MODULE_DEVICE_TABLE(i2c, lp5523_id);
1012
1013 static struct i2c_driver lp5523_driver = {
1014 .driver = {
1015 .name = "lp5523",
1016 },
1017 .probe = lp5523_probe,
1018 .remove = lp5523_remove,
1019 .id_table = lp5523_id,
1020 };
1021
1022 module_i2c_driver(lp5523_driver);
1023
1024 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
1025 MODULE_DESCRIPTION("LP5523 LED engine");
1026 MODULE_LICENSE("GPL");