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cgroup_freezer: prepare freezer_change_state() for full hierarchy support
[linux-2.6/libata-dev.git] / drivers / leds / leds-lp5523.c
blob97994ffdc0146fd7b95cb4a0ee05282e71c7cb39
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 enum lp5523_chip_id {
108 LP5523,
109 LP55231,
110 };
111
112 struct lp5523_engine {
113 int id;
114 u8 mode;
115 u8 prog_page;
116 u8 mux_page;
117 u16 led_mux;
118 u8 engine_mask;
119 };
120
121 struct lp5523_led {
122 int id;
123 u8 chan_nr;
124 u8 led_current;
125 u8 max_current;
126 struct led_classdev cdev;
127 struct work_struct brightness_work;
128 u8 brightness;
129 };
130
131 struct lp5523_chip {
132 struct mutex lock; /* Serialize control */
133 struct i2c_client *client;
134 struct lp5523_engine engines[LP5523_ENGINES];
135 struct lp5523_led leds[LP5523_LEDS];
136 struct lp5523_platform_data *pdata;
137 u8 num_channels;
138 u8 num_leds;
139 };
140
141 static inline struct lp5523_led *cdev_to_led(struct led_classdev *cdev)
142 {
143 return container_of(cdev, struct lp5523_led, cdev);
144 }
145
146 static inline struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine)
147 {
148 return container_of(engine, struct lp5523_chip,
149 engines[engine->id - 1]);
150 }
151
152 static inline struct lp5523_chip *led_to_lp5523(struct lp5523_led *led)
153 {
154 return container_of(led, struct lp5523_chip,
155 leds[led->id]);
156 }
157
158 static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode);
159 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode);
160 static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern);
161
162 static void lp5523_led_brightness_work(struct work_struct *work);
163
164 static int lp5523_write(struct i2c_client *client, u8 reg, u8 value)
165 {
166 return i2c_smbus_write_byte_data(client, reg, value);
167 }
168
169 static int lp5523_read(struct i2c_client *client, u8 reg, u8 *buf)
170 {
171 s32 ret = i2c_smbus_read_byte_data(client, reg);
172
173 if (ret < 0)
174 return -EIO;
175
176 *buf = ret;
177 return 0;
178 }
179
180 static int lp5523_detect(struct i2c_client *client)
181 {
182 int ret;
183 u8 buf;
184
185 ret = lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE);
186 if (ret)
187 return ret;
188 ret = lp5523_read(client, LP5523_REG_ENABLE, &buf);
189 if (ret)
190 return ret;
191 if (buf == 0x40)
192 return 0;
193 else
194 return -ENODEV;
195 }
196
197 static int lp5523_configure(struct i2c_client *client)
198 {
199 struct lp5523_chip *chip = i2c_get_clientdata(client);
200 int ret = 0;
201 u8 status;
202
203 /* one pattern per engine setting led mux start and stop addresses */
204 static const u8 pattern[][LP5523_PROGRAM_LENGTH] = {
205 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
206 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
207 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
208 };
209
210 ret |= lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE);
211 /* Chip startup time is 500 us, 1 - 2 ms gives some margin */
212 usleep_range(1000, 2000);
213
214 ret |= lp5523_write(client, LP5523_REG_CONFIG,
215 LP5523_AUTO_INC | LP5523_PWR_SAVE |
216 LP5523_CP_AUTO | LP5523_AUTO_CLK |
217 LP5523_PWM_PWR_SAVE);
218
219 /* turn on all leds */
220 ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
221 ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
222
223 /* hardcode 32 bytes of memory for each engine from program memory */
224 ret |= lp5523_write(client, LP5523_REG_CH1_PROG_START, 0x00);
225 ret |= lp5523_write(client, LP5523_REG_CH2_PROG_START, 0x10);
226 ret |= lp5523_write(client, LP5523_REG_CH3_PROG_START, 0x20);
227
228 /* write led mux address space for each channel */
229 ret |= lp5523_load_program(&chip->engines[0], pattern[0]);
230 ret |= lp5523_load_program(&chip->engines[1], pattern[1]);
231 ret |= lp5523_load_program(&chip->engines[2], pattern[2]);
232
233 if (ret) {
234 dev_err(&client->dev, "could not load mux programs\n");
235 return -1;
236 }
237
238 /* set all engines exec state and mode to run 00101010 */
239 ret |= lp5523_write(client, LP5523_REG_ENABLE,
240 (LP5523_CMD_RUN | LP5523_ENABLE));
241
242 ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_RUN);
243
244 if (ret) {
245 dev_err(&client->dev, "could not start mux programs\n");
246 return -1;
247 }
248
249 /* Let the programs run for couple of ms and check the engine status */
250 usleep_range(3000, 6000);
251 lp5523_read(client, LP5523_REG_STATUS, &status);
252 status &= LP5523_ENG_STATUS_MASK;
253
254 if (status == LP5523_ENG_STATUS_MASK) {
255 dev_dbg(&client->dev, "all engines configured\n");
256 } else {
257 dev_info(&client->dev, "status == %x\n", status);
258 dev_err(&client->dev, "cound not configure LED engine\n");
259 return -1;
260 }
261
262 dev_info(&client->dev, "disabling engines\n");
263
264 ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED);
265
266 return ret;
267 }
268
269 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode)
270 {
271 struct lp5523_chip *chip = engine_to_lp5523(engine);
272 struct i2c_client *client = chip->client;
273 int ret;
274 u8 engine_state;
275
276 ret = lp5523_read(client, LP5523_REG_OP_MODE, &engine_state);
277 if (ret)
278 goto fail;
279
280 engine_state &= ~(engine->engine_mask);
281
282 /* set mode only for this engine */
283 mode &= engine->engine_mask;
284
285 engine_state |= mode;
286
287 ret |= lp5523_write(client, LP5523_REG_OP_MODE, engine_state);
288 fail:
289 return ret;
290 }
291
292 static int lp5523_load_mux(struct lp5523_engine *engine, u16 mux)
293 {
294 struct lp5523_chip *chip = engine_to_lp5523(engine);
295 struct i2c_client *client = chip->client;
296 int ret = 0;
297
298 ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
299
300 ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, engine->mux_page);
301 ret |= lp5523_write(client, LP5523_REG_PROG_MEM,
302 (u8)(mux >> 8));
303 ret |= lp5523_write(client, LP5523_REG_PROG_MEM + 1, (u8)(mux));
304 engine->led_mux = mux;
305
306 return ret;
307 }
308
309 static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern)
310 {
311 struct lp5523_chip *chip = engine_to_lp5523(engine);
312 struct i2c_client *client = chip->client;
313
314 int ret = 0;
315
316 ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
317
318 ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL,
319 engine->prog_page);
320 ret |= i2c_smbus_write_i2c_block_data(client, LP5523_REG_PROG_MEM,
321 LP5523_PROGRAM_LENGTH, pattern);
322
323 return ret;
324 }
325
326 static int lp5523_run_program(struct lp5523_engine *engine)
327 {
328 struct lp5523_chip *chip = engine_to_lp5523(engine);
329 struct i2c_client *client = chip->client;
330 int ret;
331
332 ret = lp5523_write(client, LP5523_REG_ENABLE,
333 LP5523_CMD_RUN | LP5523_ENABLE);
334 if (ret)
335 goto fail;
336
337 ret = lp5523_set_engine_mode(engine, LP5523_CMD_RUN);
338 fail:
339 return ret;
340 }
341
342 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
343 {
344 int i;
345 u16 tmp_mux = 0;
346
347 len = min_t(int, len, LP5523_LEDS);
348 for (i = 0; i < len; i++) {
349 switch (buf[i]) {
350 case '1':
351 tmp_mux |= (1 << i);
352 break;
353 case '0':
354 break;
355 case '\n':
356 i = len;
357 break;
358 default:
359 return -1;
360 }
361 }
362 *mux = tmp_mux;
363
364 return 0;
365 }
366
367 static void lp5523_mux_to_array(u16 led_mux, char *array)
368 {
369 int i, pos = 0;
370 for (i = 0; i < LP5523_LEDS; i++)
371 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
372
373 array[pos] = '\0';
374 }
375
376 /*--------------------------------------------------------------*/
377 /* Sysfs interface */
378 /*--------------------------------------------------------------*/
379
380 static ssize_t show_engine_leds(struct device *dev,
381 struct device_attribute *attr,
382 char *buf, int nr)
383 {
384 struct i2c_client *client = to_i2c_client(dev);
385 struct lp5523_chip *chip = i2c_get_clientdata(client);
386 char mux[LP5523_LEDS + 1];
387
388 lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
389
390 return sprintf(buf, "%s\n", mux);
391 }
392
393 #define show_leds(nr) \
394 static ssize_t show_engine##nr##_leds(struct device *dev, \
395 struct device_attribute *attr, \
396 char *buf) \
397 { \
398 return show_engine_leds(dev, attr, buf, nr); \
399 }
400 show_leds(1)
401 show_leds(2)
402 show_leds(3)
403
404 static ssize_t store_engine_leds(struct device *dev,
405 struct device_attribute *attr,
406 const char *buf, size_t len, int nr)
407 {
408 struct i2c_client *client = to_i2c_client(dev);
409 struct lp5523_chip *chip = i2c_get_clientdata(client);
410 u16 mux = 0;
411 ssize_t ret;
412
413 if (lp5523_mux_parse(buf, &mux, len))
414 return -EINVAL;
415
416 mutex_lock(&chip->lock);
417 ret = -EINVAL;
418 if (chip->engines[nr - 1].mode != LP5523_CMD_LOAD)
419 goto leave;
420
421 if (lp5523_load_mux(&chip->engines[nr - 1], mux))
422 goto leave;
423
424 ret = len;
425 leave:
426 mutex_unlock(&chip->lock);
427 return ret;
428 }
429
430 #define store_leds(nr) \
431 static ssize_t store_engine##nr##_leds(struct device *dev, \
432 struct device_attribute *attr, \
433 const char *buf, size_t len) \
434 { \
435 return store_engine_leds(dev, attr, buf, len, nr); \
436 }
437 store_leds(1)
438 store_leds(2)
439 store_leds(3)
440
441 static ssize_t lp5523_selftest(struct device *dev,
442 struct device_attribute *attr,
443 char *buf)
444 {
445 struct i2c_client *client = to_i2c_client(dev);
446 struct lp5523_chip *chip = i2c_get_clientdata(client);
447 int i, ret, pos = 0;
448 int led = 0;
449 u8 status, adc, vdd;
450
451 mutex_lock(&chip->lock);
452
453 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
454 if (ret < 0)
455 goto fail;
456
457 /* Check that ext clock is really in use if requested */
458 if ((chip->pdata) && (chip->pdata->clock_mode == LP5523_CLOCK_EXT))
459 if ((status & LP5523_EXT_CLK_USED) == 0)
460 goto fail;
461
462 /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
463 lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL,
464 LP5523_EN_LEDTEST | 16);
465 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
466 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
467 if (!(status & LP5523_LEDTEST_DONE))
468 usleep_range(3000, 6000); /* Was not ready. Wait little bit */
469
470 ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd);
471 vdd--; /* There may be some fluctuation in measurement */
472
473 for (i = 0; i < LP5523_LEDS; i++) {
474 /* Skip non-existing channels */
475 if (chip->pdata->led_config[i].led_current == 0)
476 continue;
477
478 /* Set default current */
479 lp5523_write(chip->client,
480 LP5523_REG_LED_CURRENT_BASE + i,
481 chip->pdata->led_config[i].led_current);
482
483 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff);
484 /* let current stabilize 2 - 4ms before measurements start */
485 usleep_range(2000, 4000);
486 lp5523_write(chip->client,
487 LP5523_REG_LED_TEST_CTRL,
488 LP5523_EN_LEDTEST | i);
489 /* ADC conversion time is 2.7 ms typically */
490 usleep_range(3000, 6000);
491 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
492 if (!(status & LP5523_LEDTEST_DONE))
493 usleep_range(3000, 6000);/* Was not ready. Wait. */
494 ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc);
495
496 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
497 pos += sprintf(buf + pos, "LED %d FAIL\n", i);
498
499 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00);
500
501 /* Restore current */
502 lp5523_write(chip->client,
503 LP5523_REG_LED_CURRENT_BASE + i,
504 chip->leds[led].led_current);
505 led++;
506 }
507 if (pos == 0)
508 pos = sprintf(buf, "OK\n");
509 goto release_lock;
510 fail:
511 pos = sprintf(buf, "FAIL\n");
512
513 release_lock:
514 mutex_unlock(&chip->lock);
515
516 return pos;
517 }
518
519 static void lp5523_set_brightness(struct led_classdev *cdev,
520 enum led_brightness brightness)
521 {
522 struct lp5523_led *led = cdev_to_led(cdev);
523
524 led->brightness = (u8)brightness;
525
526 schedule_work(&led->brightness_work);
527 }
528
529 static void lp5523_led_brightness_work(struct work_struct *work)
530 {
531 struct lp5523_led *led = container_of(work,
532 struct lp5523_led,
533 brightness_work);
534 struct lp5523_chip *chip = led_to_lp5523(led);
535 struct i2c_client *client = chip->client;
536
537 mutex_lock(&chip->lock);
538
539 lp5523_write(client, LP5523_REG_LED_PWM_BASE + led->chan_nr,
540 led->brightness);
541
542 mutex_unlock(&chip->lock);
543 }
544
545 static int lp5523_do_store_load(struct lp5523_engine *engine,
546 const char *buf, size_t len)
547 {
548 struct lp5523_chip *chip = engine_to_lp5523(engine);
549 struct i2c_client *client = chip->client;
550 int ret, nrchars, offset = 0, i = 0;
551 char c[3];
552 unsigned cmd;
553 u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
554
555 if (engine->mode != LP5523_CMD_LOAD)
556 return -EINVAL;
557
558 while ((offset < len - 1) && (i < LP5523_PROGRAM_LENGTH)) {
559 /* separate sscanfs because length is working only for %s */
560 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
561 ret = sscanf(c, "%2x", &cmd);
562 if (ret != 1)
563 goto fail;
564 pattern[i] = (u8)cmd;
565
566 offset += nrchars;
567 i++;
568 }
569
570 /* Each instruction is 16bit long. Check that length is even */
571 if (i % 2)
572 goto fail;
573
574 mutex_lock(&chip->lock);
575 ret = lp5523_load_program(engine, pattern);
576 mutex_unlock(&chip->lock);
577
578 if (ret) {
579 dev_err(&client->dev, "failed loading pattern\n");
580 return ret;
581 }
582
583 return len;
584 fail:
585 dev_err(&client->dev, "wrong pattern format\n");
586 return -EINVAL;
587 }
588
589 static ssize_t store_engine_load(struct device *dev,
590 struct device_attribute *attr,
591 const char *buf, size_t len, int nr)
592 {
593 struct i2c_client *client = to_i2c_client(dev);
594 struct lp5523_chip *chip = i2c_get_clientdata(client);
595 return lp5523_do_store_load(&chip->engines[nr - 1], buf, len);
596 }
597
598 #define store_load(nr) \
599 static ssize_t store_engine##nr##_load(struct device *dev, \
600 struct device_attribute *attr, \
601 const char *buf, size_t len) \
602 { \
603 return store_engine_load(dev, attr, buf, len, nr); \
604 }
605 store_load(1)
606 store_load(2)
607 store_load(3)
608
609 static ssize_t show_engine_mode(struct device *dev,
610 struct device_attribute *attr,
611 char *buf, int nr)
612 {
613 struct i2c_client *client = to_i2c_client(dev);
614 struct lp5523_chip *chip = i2c_get_clientdata(client);
615 switch (chip->engines[nr - 1].mode) {
616 case LP5523_CMD_RUN:
617 return sprintf(buf, "run\n");
618 case LP5523_CMD_LOAD:
619 return sprintf(buf, "load\n");
620 case LP5523_CMD_DISABLED:
621 return sprintf(buf, "disabled\n");
622 default:
623 return sprintf(buf, "disabled\n");
624 }
625 }
626
627 #define show_mode(nr) \
628 static ssize_t show_engine##nr##_mode(struct device *dev, \
629 struct device_attribute *attr, \
630 char *buf) \
631 { \
632 return show_engine_mode(dev, attr, buf, nr); \
633 }
634 show_mode(1)
635 show_mode(2)
636 show_mode(3)
637
638 static ssize_t store_engine_mode(struct device *dev,
639 struct device_attribute *attr,
640 const char *buf, size_t len, int nr)
641 {
642 struct i2c_client *client = to_i2c_client(dev);
643 struct lp5523_chip *chip = i2c_get_clientdata(client);
644 struct lp5523_engine *engine = &chip->engines[nr - 1];
645 mutex_lock(&chip->lock);
646
647 if (!strncmp(buf, "run", 3))
648 lp5523_set_mode(engine, LP5523_CMD_RUN);
649 else if (!strncmp(buf, "load", 4))
650 lp5523_set_mode(engine, LP5523_CMD_LOAD);
651 else if (!strncmp(buf, "disabled", 8))
652 lp5523_set_mode(engine, LP5523_CMD_DISABLED);
653
654 mutex_unlock(&chip->lock);
655 return len;
656 }
657
658 #define store_mode(nr) \
659 static ssize_t store_engine##nr##_mode(struct device *dev, \
660 struct device_attribute *attr, \
661 const char *buf, size_t len) \
662 { \
663 return store_engine_mode(dev, attr, buf, len, nr); \
664 }
665 store_mode(1)
666 store_mode(2)
667 store_mode(3)
668
669 static ssize_t show_max_current(struct device *dev,
670 struct device_attribute *attr,
671 char *buf)
672 {
673 struct led_classdev *led_cdev = dev_get_drvdata(dev);
674 struct lp5523_led *led = cdev_to_led(led_cdev);
675
676 return sprintf(buf, "%d\n", led->max_current);
677 }
678
679 static ssize_t show_current(struct device *dev,
680 struct device_attribute *attr,
681 char *buf)
682 {
683 struct led_classdev *led_cdev = dev_get_drvdata(dev);
684 struct lp5523_led *led = cdev_to_led(led_cdev);
685
686 return sprintf(buf, "%d\n", led->led_current);
687 }
688
689 static ssize_t store_current(struct device *dev,
690 struct device_attribute *attr,
691 const char *buf, size_t len)
692 {
693 struct led_classdev *led_cdev = dev_get_drvdata(dev);
694 struct lp5523_led *led = cdev_to_led(led_cdev);
695 struct lp5523_chip *chip = led_to_lp5523(led);
696 ssize_t ret;
697 unsigned long curr;
698
699 if (strict_strtoul(buf, 0, &curr))
700 return -EINVAL;
701
702 if (curr > led->max_current)
703 return -EINVAL;
704
705 mutex_lock(&chip->lock);
706 ret = lp5523_write(chip->client,
707 LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
708 (u8)curr);
709 mutex_unlock(&chip->lock);
710
711 if (ret < 0)
712 return ret;
713
714 led->led_current = (u8)curr;
715
716 return len;
717 }
718
719 /* led class device attributes */
720 static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current);
721 static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
722
723 static struct attribute *lp5523_led_attributes[] = {
724 &dev_attr_led_current.attr,
725 &dev_attr_max_current.attr,
726 NULL,
727 };
728
729 static struct attribute_group lp5523_led_attribute_group = {
730 .attrs = lp5523_led_attributes
731 };
732
733 /* device attributes */
734 static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR,
735 show_engine1_mode, store_engine1_mode);
736 static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR,
737 show_engine2_mode, store_engine2_mode);
738 static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR,
739 show_engine3_mode, store_engine3_mode);
740 static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUSR,
741 show_engine1_leds, store_engine1_leds);
742 static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUSR,
743 show_engine2_leds, store_engine2_leds);
744 static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUSR,
745 show_engine3_leds, store_engine3_leds);
746 static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load);
747 static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load);
748 static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load);
749 static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL);
750
751 static struct attribute *lp5523_attributes[] = {
752 &dev_attr_engine1_mode.attr,
753 &dev_attr_engine2_mode.attr,
754 &dev_attr_engine3_mode.attr,
755 &dev_attr_selftest.attr,
756 &dev_attr_engine1_load.attr,
757 &dev_attr_engine1_leds.attr,
758 &dev_attr_engine2_load.attr,
759 &dev_attr_engine2_leds.attr,
760 &dev_attr_engine3_load.attr,
761 &dev_attr_engine3_leds.attr,
762 NULL,
763 };
764
765 static const struct attribute_group lp5523_group = {
766 .attrs = lp5523_attributes,
767 };
768
769 static int lp5523_register_sysfs(struct i2c_client *client)
770 {
771 struct device *dev = &client->dev;
772 int ret;
773
774 ret = sysfs_create_group(&dev->kobj, &lp5523_group);
775 if (ret < 0)
776 return ret;
777
778 return 0;
779 }
780
781 static void lp5523_unregister_sysfs(struct i2c_client *client)
782 {
783 struct lp5523_chip *chip = i2c_get_clientdata(client);
784 struct device *dev = &client->dev;
785 int i;
786
787 sysfs_remove_group(&dev->kobj, &lp5523_group);
788
789 for (i = 0; i < chip->num_leds; i++)
790 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
791 &lp5523_led_attribute_group);
792 }
793
794 /*--------------------------------------------------------------*/
795 /* Set chip operating mode */
796 /*--------------------------------------------------------------*/
797 static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode)
798 {
799 /* if in that mode already do nothing, except for run */
800 if (mode == engine->mode && mode != LP5523_CMD_RUN)
801 return;
802
803 switch (mode) {
804 case LP5523_CMD_RUN:
805 lp5523_run_program(engine);
806 break;
807 case LP5523_CMD_LOAD:
808 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
809 lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
810 break;
811 case LP5523_CMD_DISABLED:
812 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
813 break;
814 default:
815 return;
816 }
817
818 engine->mode = mode;
819 }
820
821 /*--------------------------------------------------------------*/
822 /* Probe, Attach, Remove */
823 /*--------------------------------------------------------------*/
824 static int __init lp5523_init_engine(struct lp5523_engine *engine, int id)
825 {
826 if (id < 1 || id > LP5523_ENGINES)
827 return -1;
828 engine->id = id;
829 engine->engine_mask = LP5523_ENG_MASK_BASE >> SHIFT_MASK(id);
830 engine->prog_page = id - 1;
831 engine->mux_page = id + 2;
832
833 return 0;
834 }
835
836 static int __devinit lp5523_init_led(struct lp5523_led *led, struct device *dev,
837 int chan, struct lp5523_platform_data *pdata,
838 const char *chip_name)
839 {
840 char name[32];
841 int res;
842
843 if (chan >= LP5523_LEDS)
844 return -EINVAL;
845
846 if (pdata->led_config[chan].led_current) {
847 led->led_current = pdata->led_config[chan].led_current;
848 led->max_current = pdata->led_config[chan].max_current;
849 led->chan_nr = pdata->led_config[chan].chan_nr;
850
851 if (led->chan_nr >= LP5523_LEDS) {
852 dev_err(dev, "Use channel numbers between 0 and %d\n",
853 LP5523_LEDS - 1);
854 return -EINVAL;
855 }
856
857 if (pdata->led_config[chan].name) {
858 led->cdev.name = pdata->led_config[chan].name;
859 } else {
860 snprintf(name, sizeof(name), "%s:channel%d",
861 pdata->label ? : chip_name, chan);
862 led->cdev.name = name;
863 }
864
865 led->cdev.brightness_set = lp5523_set_brightness;
866 res = led_classdev_register(dev, &led->cdev);
867 if (res < 0) {
868 dev_err(dev, "couldn't register led on channel %d\n",
869 chan);
870 return res;
871 }
872 res = sysfs_create_group(&led->cdev.dev->kobj,
873 &lp5523_led_attribute_group);
874 if (res < 0) {
875 dev_err(dev, "couldn't register current attribute\n");
876 led_classdev_unregister(&led->cdev);
877 return res;
878 }
879 } else {
880 led->led_current = 0;
881 }
882 return 0;
883 }
884
885 static int __devinit lp5523_probe(struct i2c_client *client,
886 const struct i2c_device_id *id)
887 {
888 struct lp5523_chip *chip;
889 struct lp5523_platform_data *pdata;
890 int ret, i, led;
891
892 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
893 if (!chip)
894 return -ENOMEM;
895
896 i2c_set_clientdata(client, chip);
897 chip->client = client;
898
899 pdata = client->dev.platform_data;
900
901 if (!pdata) {
902 dev_err(&client->dev, "no platform data\n");
903 return -EINVAL;
904 }
905
906 mutex_init(&chip->lock);
907
908 chip->pdata = pdata;
909
910 if (pdata->setup_resources) {
911 ret = pdata->setup_resources();
912 if (ret < 0)
913 return ret;
914 }
915
916 if (pdata->enable) {
917 pdata->enable(0);
918 usleep_range(1000, 2000); /* Keep enable down at least 1ms */
919 pdata->enable(1);
920 usleep_range(1000, 2000); /* 500us abs min. */
921 }
922
923 lp5523_write(client, LP5523_REG_RESET, 0xff);
924 usleep_range(10000, 20000); /*
925 * Exact value is not available. 10 - 20ms
926 * appears to be enough for reset.
927 */
928 ret = lp5523_detect(client);
929 if (ret)
930 goto fail1;
931
932 dev_info(&client->dev, "%s Programmable led chip found\n", id->name);
933
934 /* Initialize engines */
935 for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
936 ret = lp5523_init_engine(&chip->engines[i], i + 1);
937 if (ret) {
938 dev_err(&client->dev, "error initializing engine\n");
939 goto fail1;
940 }
941 }
942 ret = lp5523_configure(client);
943 if (ret < 0) {
944 dev_err(&client->dev, "error configuring chip\n");
945 goto fail1;
946 }
947
948 /* Initialize leds */
949 chip->num_channels = pdata->num_channels;
950 chip->num_leds = 0;
951 led = 0;
952 for (i = 0; i < pdata->num_channels; i++) {
953 /* Do not initialize channels that are not connected */
954 if (pdata->led_config[i].led_current == 0)
955 continue;
956
957 INIT_WORK(&chip->leds[led].brightness_work,
958 lp5523_led_brightness_work);
959
960 ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata,
961 id->name);
962 if (ret) {
963 dev_err(&client->dev, "error initializing leds\n");
964 goto fail2;
965 }
966 chip->num_leds++;
967
968 chip->leds[led].id = led;
969 /* Set LED current */
970 lp5523_write(client,
971 LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
972 chip->leds[led].led_current);
973
974 led++;
975 }
976
977 ret = lp5523_register_sysfs(client);
978 if (ret) {
979 dev_err(&client->dev, "registering sysfs failed\n");
980 goto fail2;
981 }
982 return ret;
983 fail2:
984 for (i = 0; i < chip->num_leds; i++) {
985 led_classdev_unregister(&chip->leds[i].cdev);
986 flush_work(&chip->leds[i].brightness_work);
987 }
988 fail1:
989 if (pdata->enable)
990 pdata->enable(0);
991 if (pdata->release_resources)
992 pdata->release_resources();
993 return ret;
994 }
995
996 static int lp5523_remove(struct i2c_client *client)
997 {
998 struct lp5523_chip *chip = i2c_get_clientdata(client);
999 int i;
1000
1001 /* Disable engine mode */
1002 lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED);
1003
1004 lp5523_unregister_sysfs(client);
1005
1006 for (i = 0; i < chip->num_leds; i++) {
1007 led_classdev_unregister(&chip->leds[i].cdev);
1008 flush_work(&chip->leds[i].brightness_work);
1009 }
1010
1011 if (chip->pdata->enable)
1012 chip->pdata->enable(0);
1013 if (chip->pdata->release_resources)
1014 chip->pdata->release_resources();
1015 return 0;
1016 }
1017
1018 static const struct i2c_device_id lp5523_id[] = {
1019 { "lp5523", LP5523 },
1020 { "lp55231", LP55231 },
1021 { }
1022 };
1023
1024 MODULE_DEVICE_TABLE(i2c, lp5523_id);
1025
1026 static struct i2c_driver lp5523_driver = {
1027 .driver = {
1028 .name = "lp5523x",
1029 },
1030 .probe = lp5523_probe,
1031 .remove = lp5523_remove,
1032 .id_table = lp5523_id,
1033 };
1034
1035 module_i2c_driver(lp5523_driver);
1036
1037 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
1038 MODULE_DESCRIPTION("LP5523 LED engine");
1039 MODULE_LICENSE("GPL");
Linux 2.6 libata-dev (mirror)