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Merge branch 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6
[deliverable/linux.git] / drivers / leds / leds-lp5523.c
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 const struct attribute_group *attributes;
109 int id;
110 u8 mode;
111 u8 prog_page;
112 u8 mux_page;
113 u16 led_mux;
114 u8 engine_mask;
115 };
116
117 struct lp5523_led {
118 int id;
119 u8 chan_nr;
120 u8 led_current;
121 u8 max_current;
122 struct led_classdev cdev;
123 struct work_struct brightness_work;
124 u8 brightness;
125 };
126
127 struct lp5523_chip {
128 struct mutex lock; /* Serialize control */
129 struct i2c_client *client;
130 struct lp5523_engine engines[LP5523_ENGINES];
131 struct lp5523_led leds[LP5523_LEDS];
132 struct lp5523_platform_data *pdata;
133 u8 num_channels;
134 u8 num_leds;
135 };
136
137 static inline struct lp5523_led *cdev_to_led(struct led_classdev *cdev)
138 {
139 return container_of(cdev, struct lp5523_led, cdev);
140 }
141
142 static inline struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine)
143 {
144 return container_of(engine, struct lp5523_chip,
145 engines[engine->id - 1]);
146 }
147
148 static inline struct lp5523_chip *led_to_lp5523(struct lp5523_led *led)
149 {
150 return container_of(led, struct lp5523_chip,
151 leds[led->id]);
152 }
153
154 static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode);
155 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode);
156 static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern);
157
158 static void lp5523_led_brightness_work(struct work_struct *work);
159
160 static int lp5523_write(struct i2c_client *client, u8 reg, u8 value)
161 {
162 return i2c_smbus_write_byte_data(client, reg, value);
163 }
164
165 static int lp5523_read(struct i2c_client *client, u8 reg, u8 *buf)
166 {
167 s32 ret = i2c_smbus_read_byte_data(client, reg);
168
169 if (ret < 0)
170 return -EIO;
171
172 *buf = ret;
173 return 0;
174 }
175
176 static int lp5523_detect(struct i2c_client *client)
177 {
178 int ret;
179 u8 buf;
180
181 ret = lp5523_write(client, LP5523_REG_ENABLE, 0x40);
182 if (ret)
183 return ret;
184 ret = lp5523_read(client, LP5523_REG_ENABLE, &buf);
185 if (ret)
186 return ret;
187 if (buf == 0x40)
188 return 0;
189 else
190 return -ENODEV;
191 }
192
193 static int lp5523_configure(struct i2c_client *client)
194 {
195 struct lp5523_chip *chip = i2c_get_clientdata(client);
196 int ret = 0;
197 u8 status;
198
199 /* one pattern per engine setting led mux start and stop addresses */
200 u8 pattern[][LP5523_PROGRAM_LENGTH] = {
201 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
202 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
203 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
204 };
205
206 ret |= lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE);
207 /* Chip startup time is 500 us, 1 - 2 ms gives some margin */
208 usleep_range(1000, 2000);
209
210 ret |= lp5523_write(client, LP5523_REG_CONFIG,
211 LP5523_AUTO_INC | LP5523_PWR_SAVE |
212 LP5523_CP_AUTO | LP5523_AUTO_CLK |
213 LP5523_PWM_PWR_SAVE);
214
215 /* turn on all leds */
216 ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
217 ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
218
219 /* hardcode 32 bytes of memory for each engine from program memory */
220 ret |= lp5523_write(client, LP5523_REG_CH1_PROG_START, 0x00);
221 ret |= lp5523_write(client, LP5523_REG_CH2_PROG_START, 0x10);
222 ret |= lp5523_write(client, LP5523_REG_CH3_PROG_START, 0x20);
223
224 /* write led mux address space for each channel */
225 ret |= lp5523_load_program(&chip->engines[0], pattern[0]);
226 ret |= lp5523_load_program(&chip->engines[1], pattern[1]);
227 ret |= lp5523_load_program(&chip->engines[2], pattern[2]);
228
229 if (ret) {
230 dev_err(&client->dev, "could not load mux programs\n");
231 return -1;
232 }
233
234 /* set all engines exec state and mode to run 00101010 */
235 ret |= lp5523_write(client, LP5523_REG_ENABLE,
236 (LP5523_CMD_RUN | LP5523_ENABLE));
237
238 ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_RUN);
239
240 if (ret) {
241 dev_err(&client->dev, "could not start mux programs\n");
242 return -1;
243 }
244
245 /* Let the programs run for couple of ms and check the engine status */
246 usleep_range(3000, 6000);
247 lp5523_read(client, LP5523_REG_STATUS, &status);
248 status &= LP5523_ENG_STATUS_MASK;
249
250 if (status == LP5523_ENG_STATUS_MASK) {
251 dev_dbg(&client->dev, "all engines configured\n");
252 } else {
253 dev_info(&client->dev, "status == %x\n", status);
254 dev_err(&client->dev, "cound not configure LED engine\n");
255 return -1;
256 }
257
258 dev_info(&client->dev, "disabling engines\n");
259
260 ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED);
261
262 return ret;
263 }
264
265 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode)
266 {
267 struct lp5523_chip *chip = engine_to_lp5523(engine);
268 struct i2c_client *client = chip->client;
269 int ret;
270 u8 engine_state;
271
272 ret = lp5523_read(client, LP5523_REG_OP_MODE, &engine_state);
273 if (ret)
274 goto fail;
275
276 engine_state &= ~(engine->engine_mask);
277
278 /* set mode only for this engine */
279 mode &= engine->engine_mask;
280
281 engine_state |= mode;
282
283 ret |= lp5523_write(client, LP5523_REG_OP_MODE, engine_state);
284 fail:
285 return ret;
286 }
287
288 static int lp5523_load_mux(struct lp5523_engine *engine, u16 mux)
289 {
290 struct lp5523_chip *chip = engine_to_lp5523(engine);
291 struct i2c_client *client = chip->client;
292 int ret = 0;
293
294 ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
295
296 ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, engine->mux_page);
297 ret |= lp5523_write(client, LP5523_REG_PROG_MEM,
298 (u8)(mux >> 8));
299 ret |= lp5523_write(client, LP5523_REG_PROG_MEM + 1, (u8)(mux));
300 engine->led_mux = mux;
301
302 return ret;
303 }
304
305 static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern)
306 {
307 struct lp5523_chip *chip = engine_to_lp5523(engine);
308 struct i2c_client *client = chip->client;
309
310 int ret = 0;
311
312 ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
313
314 ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL,
315 engine->prog_page);
316 ret |= i2c_smbus_write_i2c_block_data(client, LP5523_REG_PROG_MEM,
317 LP5523_PROGRAM_LENGTH, pattern);
318
319 return ret;
320 }
321
322 static int lp5523_run_program(struct lp5523_engine *engine)
323 {
324 struct lp5523_chip *chip = engine_to_lp5523(engine);
325 struct i2c_client *client = chip->client;
326 int ret;
327
328 ret = lp5523_write(client, LP5523_REG_ENABLE,
329 LP5523_CMD_RUN | LP5523_ENABLE);
330 if (ret)
331 goto fail;
332
333 ret = lp5523_set_engine_mode(engine, LP5523_CMD_RUN);
334 fail:
335 return ret;
336 }
337
338 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
339 {
340 int i;
341 u16 tmp_mux = 0;
342 len = len < LP5523_LEDS ? len : LP5523_LEDS;
343 for (i = 0; i < len; i++) {
344 switch (buf[i]) {
345 case '1':
346 tmp_mux |= (1 << i);
347 break;
348 case '0':
349 break;
350 case '\n':
351 i = len;
352 break;
353 default:
354 return -1;
355 }
356 }
357 *mux = tmp_mux;
358
359 return 0;
360 }
361
362 static void lp5523_mux_to_array(u16 led_mux, char *array)
363 {
364 int i, pos = 0;
365 for (i = 0; i < LP5523_LEDS; i++)
366 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
367
368 array[pos] = '\0';
369 }
370
371 /*--------------------------------------------------------------*/
372 /* Sysfs interface */
373 /*--------------------------------------------------------------*/
374
375 static ssize_t show_engine_leds(struct device *dev,
376 struct device_attribute *attr,
377 char *buf, int nr)
378 {
379 struct i2c_client *client = to_i2c_client(dev);
380 struct lp5523_chip *chip = i2c_get_clientdata(client);
381 char mux[LP5523_LEDS + 1];
382
383 lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
384
385 return sprintf(buf, "%s\n", mux);
386 }
387
388 #define show_leds(nr) \
389 static ssize_t show_engine##nr##_leds(struct device *dev, \
390 struct device_attribute *attr, \
391 char *buf) \
392 { \
393 return show_engine_leds(dev, attr, buf, nr); \
394 }
395 show_leds(1)
396 show_leds(2)
397 show_leds(3)
398
399 static ssize_t store_engine_leds(struct device *dev,
400 struct device_attribute *attr,
401 const char *buf, size_t len, int nr)
402 {
403 struct i2c_client *client = to_i2c_client(dev);
404 struct lp5523_chip *chip = i2c_get_clientdata(client);
405 u16 mux = 0;
406
407 if (lp5523_mux_parse(buf, &mux, len))
408 return -EINVAL;
409
410 if (lp5523_load_mux(&chip->engines[nr - 1], mux))
411 return -EINVAL;
412
413 return len;
414 }
415
416 #define store_leds(nr) \
417 static ssize_t store_engine##nr##_leds(struct device *dev, \
418 struct device_attribute *attr, \
419 const char *buf, size_t len) \
420 { \
421 return store_engine_leds(dev, attr, buf, len, nr); \
422 }
423 store_leds(1)
424 store_leds(2)
425 store_leds(3)
426
427 static ssize_t lp5523_selftest(struct device *dev,
428 struct device_attribute *attr,
429 char *buf)
430 {
431 struct i2c_client *client = to_i2c_client(dev);
432 struct lp5523_chip *chip = i2c_get_clientdata(client);
433 int i, ret, pos = 0;
434 int led = 0;
435 u8 status, adc, vdd;
436
437 mutex_lock(&chip->lock);
438
439 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
440 if (ret < 0)
441 goto fail;
442
443 /* Check that ext clock is really in use if requested */
444 if ((chip->pdata) && (chip->pdata->clock_mode == LP5523_CLOCK_EXT))
445 if ((status & LP5523_EXT_CLK_USED) == 0)
446 goto fail;
447
448 /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
449 lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL,
450 LP5523_EN_LEDTEST | 16);
451 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
452 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
453 if (!(status & LP5523_LEDTEST_DONE))
454 usleep_range(3000, 6000); /* Was not ready. Wait little bit */
455
456 ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd);
457 vdd--; /* There may be some fluctuation in measurement */
458
459 for (i = 0; i < LP5523_LEDS; i++) {
460 /* Skip non-existing channels */
461 if (chip->pdata->led_config[i].led_current == 0)
462 continue;
463
464 /* Set default current */
465 lp5523_write(chip->client,
466 LP5523_REG_LED_CURRENT_BASE + i,
467 chip->pdata->led_config[i].led_current);
468
469 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff);
470 /* let current stabilize 2 - 4ms before measurements start */
471 usleep_range(2000, 4000);
472 lp5523_write(chip->client,
473 LP5523_REG_LED_TEST_CTRL,
474 LP5523_EN_LEDTEST | i);
475 /* ADC conversion time is 2.7 ms typically */
476 usleep_range(3000, 6000);
477 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
478 if (!(status & LP5523_LEDTEST_DONE))
479 usleep_range(3000, 6000);/* Was not ready. Wait. */
480 ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc);
481
482 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
483 pos += sprintf(buf + pos, "LED %d FAIL\n", i);
484
485 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00);
486
487 /* Restore current */
488 lp5523_write(chip->client,
489 LP5523_REG_LED_CURRENT_BASE + i,
490 chip->leds[led].led_current);
491 led++;
492 }
493 if (pos == 0)
494 pos = sprintf(buf, "OK\n");
495 goto release_lock;
496 fail:
497 pos = sprintf(buf, "FAIL\n");
498
499 release_lock:
500 mutex_unlock(&chip->lock);
501
502 return pos;
503 }
504
505 static void lp5523_set_brightness(struct led_classdev *cdev,
506 enum led_brightness brightness)
507 {
508 struct lp5523_led *led = cdev_to_led(cdev);
509
510 led->brightness = (u8)brightness;
511
512 schedule_work(&led->brightness_work);
513 }
514
515 static void lp5523_led_brightness_work(struct work_struct *work)
516 {
517 struct lp5523_led *led = container_of(work,
518 struct lp5523_led,
519 brightness_work);
520 struct lp5523_chip *chip = led_to_lp5523(led);
521 struct i2c_client *client = chip->client;
522
523 mutex_lock(&chip->lock);
524
525 lp5523_write(client, LP5523_REG_LED_PWM_BASE + led->chan_nr,
526 led->brightness);
527
528 mutex_unlock(&chip->lock);
529 }
530
531 static int lp5523_do_store_load(struct lp5523_engine *engine,
532 const char *buf, size_t len)
533 {
534 struct lp5523_chip *chip = engine_to_lp5523(engine);
535 struct i2c_client *client = chip->client;
536 int ret, nrchars, offset = 0, i = 0;
537 char c[3];
538 unsigned cmd;
539 u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
540
541 while ((offset < len - 1) && (i < LP5523_PROGRAM_LENGTH)) {
542 /* separate sscanfs because length is working only for %s */
543 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
544 ret = sscanf(c, "%2x", &cmd);
545 if (ret != 1)
546 goto fail;
547 pattern[i] = (u8)cmd;
548
549 offset += nrchars;
550 i++;
551 }
552
553 /* Each instruction is 16bit long. Check that length is even */
554 if (i % 2)
555 goto fail;
556
557 mutex_lock(&chip->lock);
558
559 ret = lp5523_load_program(engine, pattern);
560 mutex_unlock(&chip->lock);
561
562 if (ret) {
563 dev_err(&client->dev, "failed loading pattern\n");
564 return ret;
565 }
566
567 return len;
568 fail:
569 dev_err(&client->dev, "wrong pattern format\n");
570 return -EINVAL;
571 }
572
573 static ssize_t store_engine_load(struct device *dev,
574 struct device_attribute *attr,
575 const char *buf, size_t len, int nr)
576 {
577 struct i2c_client *client = to_i2c_client(dev);
578 struct lp5523_chip *chip = i2c_get_clientdata(client);
579 return lp5523_do_store_load(&chip->engines[nr - 1], buf, len);
580 }
581
582 #define store_load(nr) \
583 static ssize_t store_engine##nr##_load(struct device *dev, \
584 struct device_attribute *attr, \
585 const char *buf, size_t len) \
586 { \
587 return store_engine_load(dev, attr, buf, len, nr); \
588 }
589 store_load(1)
590 store_load(2)
591 store_load(3)
592
593 static ssize_t show_engine_mode(struct device *dev,
594 struct device_attribute *attr,
595 char *buf, int nr)
596 {
597 struct i2c_client *client = to_i2c_client(dev);
598 struct lp5523_chip *chip = i2c_get_clientdata(client);
599 switch (chip->engines[nr - 1].mode) {
600 case LP5523_CMD_RUN:
601 return sprintf(buf, "run\n");
602 case LP5523_CMD_LOAD:
603 return sprintf(buf, "load\n");
604 case LP5523_CMD_DISABLED:
605 return sprintf(buf, "disabled\n");
606 default:
607 return sprintf(buf, "disabled\n");
608 }
609 }
610
611 #define show_mode(nr) \
612 static ssize_t show_engine##nr##_mode(struct device *dev, \
613 struct device_attribute *attr, \
614 char *buf) \
615 { \
616 return show_engine_mode(dev, attr, buf, nr); \
617 }
618 show_mode(1)
619 show_mode(2)
620 show_mode(3)
621
622 static ssize_t store_engine_mode(struct device *dev,
623 struct device_attribute *attr,
624 const char *buf, size_t len, int nr)
625 {
626 struct i2c_client *client = to_i2c_client(dev);
627 struct lp5523_chip *chip = i2c_get_clientdata(client);
628 struct lp5523_engine *engine = &chip->engines[nr - 1];
629 mutex_lock(&chip->lock);
630
631 if (!strncmp(buf, "run", 3))
632 lp5523_set_mode(engine, LP5523_CMD_RUN);
633 else if (!strncmp(buf, "load", 4))
634 lp5523_set_mode(engine, LP5523_CMD_LOAD);
635 else if (!strncmp(buf, "disabled", 8))
636 lp5523_set_mode(engine, LP5523_CMD_DISABLED);
637
638 mutex_unlock(&chip->lock);
639 return len;
640 }
641
642 #define store_mode(nr) \
643 static ssize_t store_engine##nr##_mode(struct device *dev, \
644 struct device_attribute *attr, \
645 const char *buf, size_t len) \
646 { \
647 return store_engine_mode(dev, attr, buf, len, nr); \
648 }
649 store_mode(1)
650 store_mode(2)
651 store_mode(3)
652
653 static ssize_t show_max_current(struct device *dev,
654 struct device_attribute *attr,
655 char *buf)
656 {
657 struct led_classdev *led_cdev = dev_get_drvdata(dev);
658 struct lp5523_led *led = cdev_to_led(led_cdev);
659
660 return sprintf(buf, "%d\n", led->max_current);
661 }
662
663 static ssize_t show_current(struct device *dev,
664 struct device_attribute *attr,
665 char *buf)
666 {
667 struct led_classdev *led_cdev = dev_get_drvdata(dev);
668 struct lp5523_led *led = cdev_to_led(led_cdev);
669
670 return sprintf(buf, "%d\n", led->led_current);
671 }
672
673 static ssize_t store_current(struct device *dev,
674 struct device_attribute *attr,
675 const char *buf, size_t len)
676 {
677 struct led_classdev *led_cdev = dev_get_drvdata(dev);
678 struct lp5523_led *led = cdev_to_led(led_cdev);
679 struct lp5523_chip *chip = led_to_lp5523(led);
680 ssize_t ret;
681 unsigned long curr;
682
683 if (strict_strtoul(buf, 0, &curr))
684 return -EINVAL;
685
686 if (curr > led->max_current)
687 return -EINVAL;
688
689 mutex_lock(&chip->lock);
690 ret = lp5523_write(chip->client,
691 LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
692 (u8)curr);
693 mutex_unlock(&chip->lock);
694
695 if (ret < 0)
696 return ret;
697
698 led->led_current = (u8)curr;
699
700 return len;
701 }
702
703 /* led class device attributes */
704 static DEVICE_ATTR(led_current, S_IRUGO | S_IWUGO, show_current, store_current);
705 static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
706
707 static struct attribute *lp5523_led_attributes[] = {
708 &dev_attr_led_current.attr,
709 &dev_attr_max_current.attr,
710 NULL,
711 };
712
713 static struct attribute_group lp5523_led_attribute_group = {
714 .attrs = lp5523_led_attributes
715 };
716
717 /* device attributes */
718 static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUGO,
719 show_engine1_mode, store_engine1_mode);
720 static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUGO,
721 show_engine2_mode, store_engine2_mode);
722 static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUGO,
723 show_engine3_mode, store_engine3_mode);
724 static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUGO,
725 show_engine1_leds, store_engine1_leds);
726 static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUGO,
727 show_engine2_leds, store_engine2_leds);
728 static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUGO,
729 show_engine3_leds, store_engine3_leds);
730 static DEVICE_ATTR(engine1_load, S_IWUGO, NULL, store_engine1_load);
731 static DEVICE_ATTR(engine2_load, S_IWUGO, NULL, store_engine2_load);
732 static DEVICE_ATTR(engine3_load, S_IWUGO, NULL, store_engine3_load);
733 static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL);
734
735 static struct attribute *lp5523_attributes[] = {
736 &dev_attr_engine1_mode.attr,
737 &dev_attr_engine2_mode.attr,
738 &dev_attr_engine3_mode.attr,
739 &dev_attr_selftest.attr,
740 NULL
741 };
742
743 static struct attribute *lp5523_engine1_attributes[] = {
744 &dev_attr_engine1_load.attr,
745 &dev_attr_engine1_leds.attr,
746 NULL
747 };
748
749 static struct attribute *lp5523_engine2_attributes[] = {
750 &dev_attr_engine2_load.attr,
751 &dev_attr_engine2_leds.attr,
752 NULL
753 };
754
755 static struct attribute *lp5523_engine3_attributes[] = {
756 &dev_attr_engine3_load.attr,
757 &dev_attr_engine3_leds.attr,
758 NULL
759 };
760
761 static const struct attribute_group lp5523_group = {
762 .attrs = lp5523_attributes,
763 };
764
765 static const struct attribute_group lp5523_engine_group[] = {
766 {.attrs = lp5523_engine1_attributes },
767 {.attrs = lp5523_engine2_attributes },
768 {.attrs = lp5523_engine3_attributes },
769 };
770
771 static int lp5523_register_sysfs(struct i2c_client *client)
772 {
773 struct device *dev = &client->dev;
774 int ret;
775
776 ret = sysfs_create_group(&dev->kobj, &lp5523_group);
777 if (ret < 0)
778 return ret;
779
780 return 0;
781 }
782
783 static void lp5523_unregister_sysfs(struct i2c_client *client)
784 {
785 struct lp5523_chip *chip = i2c_get_clientdata(client);
786 struct device *dev = &client->dev;
787 int i;
788
789 sysfs_remove_group(&dev->kobj, &lp5523_group);
790
791 for (i = 0; i < ARRAY_SIZE(chip->engines); i++)
792 if (chip->engines[i].mode == LP5523_CMD_LOAD)
793 sysfs_remove_group(&dev->kobj, &lp5523_engine_group[i]);
794
795 for (i = 0; i < chip->num_leds; i++)
796 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
797 &lp5523_led_attribute_group);
798 }
799
800 /*--------------------------------------------------------------*/
801 /* Set chip operating mode */
802 /*--------------------------------------------------------------*/
803 static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode)
804 {
805 /* engine to chip */
806 struct lp5523_chip *chip = engine_to_lp5523(engine);
807 struct i2c_client *client = chip->client;
808 struct device *dev = &client->dev;
809 int ret = 0;
810
811 /* if in that mode already do nothing, except for run */
812 if (mode == engine->mode && mode != LP5523_CMD_RUN)
813 return 0;
814
815 if (mode == LP5523_CMD_RUN) {
816 ret = lp5523_run_program(engine);
817 } else if (mode == LP5523_CMD_LOAD) {
818 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
819 lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
820
821 ret = sysfs_create_group(&dev->kobj, engine->attributes);
822 if (ret)
823 return ret;
824 } else if (mode == LP5523_CMD_DISABLED) {
825 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
826 }
827
828 /* remove load attribute from sysfs if not in load mode */
829 if (engine->mode == LP5523_CMD_LOAD && mode != LP5523_CMD_LOAD)
830 sysfs_remove_group(&dev->kobj, engine->attributes);
831
832 engine->mode = mode;
833
834 return ret;
835 }
836
837 /*--------------------------------------------------------------*/
838 /* Probe, Attach, Remove */
839 /*--------------------------------------------------------------*/
840 static int __init lp5523_init_engine(struct lp5523_engine *engine, int id)
841 {
842 if (id < 1 || id > LP5523_ENGINES)
843 return -1;
844 engine->id = id;
845 engine->engine_mask = LP5523_ENG_MASK_BASE >> SHIFT_MASK(id);
846 engine->prog_page = id - 1;
847 engine->mux_page = id + 2;
848 engine->attributes = &lp5523_engine_group[id - 1];
849
850 return 0;
851 }
852
853 static int __init lp5523_init_led(struct lp5523_led *led, struct device *dev,
854 int chan, struct lp5523_platform_data *pdata)
855 {
856 char name[32];
857 int res;
858
859 if (chan >= LP5523_LEDS)
860 return -EINVAL;
861
862 if (pdata->led_config[chan].led_current) {
863 led->led_current = pdata->led_config[chan].led_current;
864 led->max_current = pdata->led_config[chan].max_current;
865 led->chan_nr = pdata->led_config[chan].chan_nr;
866
867 if (led->chan_nr >= LP5523_LEDS) {
868 dev_err(dev, "Use channel numbers between 0 and %d\n",
869 LP5523_LEDS - 1);
870 return -EINVAL;
871 }
872
873 snprintf(name, 32, "lp5523:channel%d", chan);
874
875 led->cdev.name = name;
876 led->cdev.brightness_set = lp5523_set_brightness;
877 res = led_classdev_register(dev, &led->cdev);
878 if (res < 0) {
879 dev_err(dev, "couldn't register led on channel %d\n",
880 chan);
881 return res;
882 }
883 res = sysfs_create_group(&led->cdev.dev->kobj,
884 &lp5523_led_attribute_group);
885 if (res < 0) {
886 dev_err(dev, "couldn't register current attribute\n");
887 led_classdev_unregister(&led->cdev);
888 return res;
889 }
890 } else {
891 led->led_current = 0;
892 }
893 return 0;
894 }
895
896 static struct i2c_driver lp5523_driver;
897
898 static int lp5523_probe(struct i2c_client *client,
899 const struct i2c_device_id *id)
900 {
901 struct lp5523_chip *chip;
902 struct lp5523_platform_data *pdata;
903 int ret, i, led;
904
905 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
906 if (!chip)
907 return -ENOMEM;
908
909 i2c_set_clientdata(client, chip);
910 chip->client = client;
911
912 pdata = client->dev.platform_data;
913
914 if (!pdata) {
915 dev_err(&client->dev, "no platform data\n");
916 ret = -EINVAL;
917 goto fail1;
918 }
919
920 mutex_init(&chip->lock);
921
922 chip->pdata = pdata;
923
924 if (pdata->setup_resources) {
925 ret = pdata->setup_resources();
926 if (ret < 0)
927 goto fail1;
928 }
929
930 if (pdata->enable) {
931 pdata->enable(0);
932 usleep_range(1000, 2000); /* Keep enable down at least 1ms */
933 pdata->enable(1);
934 usleep_range(1000, 2000); /* 500us abs min. */
935 }
936
937 lp5523_write(client, LP5523_REG_RESET, 0xff);
938 usleep_range(10000, 20000); /*
939 * Exact value is not available. 10 - 20ms
940 * appears to be enough for reset.
941 */
942 ret = lp5523_detect(client);
943 if (ret)
944 goto fail2;
945
946 dev_info(&client->dev, "LP5523 Programmable led chip found\n");
947
948 /* Initialize engines */
949 for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
950 ret = lp5523_init_engine(&chip->engines[i], i + 1);
951 if (ret) {
952 dev_err(&client->dev, "error initializing engine\n");
953 goto fail2;
954 }
955 }
956 ret = lp5523_configure(client);
957 if (ret < 0) {
958 dev_err(&client->dev, "error configuring chip\n");
959 goto fail2;
960 }
961
962 /* Initialize leds */
963 chip->num_channels = pdata->num_channels;
964 chip->num_leds = 0;
965 led = 0;
966 for (i = 0; i < pdata->num_channels; i++) {
967 /* Do not initialize channels that are not connected */
968 if (pdata->led_config[i].led_current == 0)
969 continue;
970
971 ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata);
972 if (ret) {
973 dev_err(&client->dev, "error initializing leds\n");
974 goto fail3;
975 }
976 chip->num_leds++;
977
978 chip->leds[led].id = led;
979 /* Set LED current */
980 lp5523_write(client,
981 LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
982 chip->leds[led].led_current);
983
984 INIT_WORK(&(chip->leds[led].brightness_work),
985 lp5523_led_brightness_work);
986
987 led++;
988 }
989
990 ret = lp5523_register_sysfs(client);
991 if (ret) {
992 dev_err(&client->dev, "registering sysfs failed\n");
993 goto fail3;
994 }
995 return ret;
996 fail3:
997 for (i = 0; i < chip->num_leds; i++) {
998 led_classdev_unregister(&chip->leds[i].cdev);
999 cancel_work_sync(&chip->leds[i].brightness_work);
1000 }
1001 fail2:
1002 if (pdata->enable)
1003 pdata->enable(0);
1004 if (pdata->release_resources)
1005 pdata->release_resources();
1006 fail1:
1007 kfree(chip);
1008 return ret;
1009 }
1010
1011 static int lp5523_remove(struct i2c_client *client)
1012 {
1013 struct lp5523_chip *chip = i2c_get_clientdata(client);
1014 int i;
1015
1016 lp5523_unregister_sysfs(client);
1017
1018 for (i = 0; i < chip->num_leds; i++) {
1019 led_classdev_unregister(&chip->leds[i].cdev);
1020 cancel_work_sync(&chip->leds[i].brightness_work);
1021 }
1022
1023 if (chip->pdata->enable)
1024 chip->pdata->enable(0);
1025 if (chip->pdata->release_resources)
1026 chip->pdata->release_resources();
1027 kfree(chip);
1028 return 0;
1029 }
1030
1031 static const struct i2c_device_id lp5523_id[] = {
1032 { "lp5523", 0 },
1033 { }
1034 };
1035
1036 MODULE_DEVICE_TABLE(i2c, lp5523_id);
1037
1038 static struct i2c_driver lp5523_driver = {
1039 .driver = {
1040 .name = "lp5523",
1041 },
1042 .probe = lp5523_probe,
1043 .remove = lp5523_remove,
1044 .id_table = lp5523_id,
1045 };
1046
1047 static int __init lp5523_init(void)
1048 {
1049 int ret;
1050
1051 ret = i2c_add_driver(&lp5523_driver);
1052
1053 if (ret < 0)
1054 printk(KERN_ALERT "Adding lp5523 driver failed\n");
1055
1056 return ret;
1057 }
1058
1059 static void __exit lp5523_exit(void)
1060 {
1061 i2c_del_driver(&lp5523_driver);
1062 }
1063
1064 module_init(lp5523_init);
1065 module_exit(lp5523_exit);
1066
1067 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
1068 MODULE_DESCRIPTION("LP5523 LED engine");
1069 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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