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Merge branch 'for-rmk/virt/psci' into for-arm-soc/virt/mach
[linux/fpc-iii.git] / drivers / leds / leds-lp5523.c
blob7f5be8948cde0a2acf4717141d2bb7fd8949dd3a
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 ret;
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 ret = lp5523_read(client, LP5523_REG_STATUS, &status);
252 if (ret < 0)
253 return ret;
254
255 status &= LP5523_ENG_STATUS_MASK;
256
257 if (status == LP5523_ENG_STATUS_MASK) {
258 dev_dbg(&client->dev, "all engines configured\n");
259 } else {
260 dev_info(&client->dev, "status == %x\n", status);
261 dev_err(&client->dev, "cound not configure LED engine\n");
262 return -1;
263 }
264
265 dev_info(&client->dev, "disabling engines\n");
266
267 ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED);
268
269 return ret;
270 }
271
272 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode)
273 {
274 struct lp5523_chip *chip = engine_to_lp5523(engine);
275 struct i2c_client *client = chip->client;
276 int ret;
277 u8 engine_state;
278
279 ret = lp5523_read(client, LP5523_REG_OP_MODE, &engine_state);
280 if (ret)
281 goto fail;
282
283 engine_state &= ~(engine->engine_mask);
284
285 /* set mode only for this engine */
286 mode &= engine->engine_mask;
287
288 engine_state |= mode;
289
290 ret |= lp5523_write(client, LP5523_REG_OP_MODE, engine_state);
291 fail:
292 return ret;
293 }
294
295 static int lp5523_load_mux(struct lp5523_engine *engine, u16 mux)
296 {
297 struct lp5523_chip *chip = engine_to_lp5523(engine);
298 struct i2c_client *client = chip->client;
299 int ret = 0;
300
301 ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
302
303 ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, engine->mux_page);
304 ret |= lp5523_write(client, LP5523_REG_PROG_MEM,
305 (u8)(mux >> 8));
306 ret |= lp5523_write(client, LP5523_REG_PROG_MEM + 1, (u8)(mux));
307 engine->led_mux = mux;
308
309 return ret;
310 }
311
312 static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern)
313 {
314 struct lp5523_chip *chip = engine_to_lp5523(engine);
315 struct i2c_client *client = chip->client;
316
317 int ret = 0;
318
319 ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
320
321 ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL,
322 engine->prog_page);
323 ret |= i2c_smbus_write_i2c_block_data(client, LP5523_REG_PROG_MEM,
324 LP5523_PROGRAM_LENGTH, pattern);
325
326 return ret;
327 }
328
329 static int lp5523_run_program(struct lp5523_engine *engine)
330 {
331 struct lp5523_chip *chip = engine_to_lp5523(engine);
332 struct i2c_client *client = chip->client;
333 int ret;
334
335 ret = lp5523_write(client, LP5523_REG_ENABLE,
336 LP5523_CMD_RUN | LP5523_ENABLE);
337 if (ret)
338 goto fail;
339
340 ret = lp5523_set_engine_mode(engine, LP5523_CMD_RUN);
341 fail:
342 return ret;
343 }
344
345 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
346 {
347 int i;
348 u16 tmp_mux = 0;
349
350 len = min_t(int, len, LP5523_LEDS);
351 for (i = 0; i < len; i++) {
352 switch (buf[i]) {
353 case '1':
354 tmp_mux |= (1 << i);
355 break;
356 case '0':
357 break;
358 case '\n':
359 i = len;
360 break;
361 default:
362 return -1;
363 }
364 }
365 *mux = tmp_mux;
366
367 return 0;
368 }
369
370 static void lp5523_mux_to_array(u16 led_mux, char *array)
371 {
372 int i, pos = 0;
373 for (i = 0; i < LP5523_LEDS; i++)
374 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
375
376 array[pos] = '\0';
377 }
378
379 /*--------------------------------------------------------------*/
380 /* Sysfs interface */
381 /*--------------------------------------------------------------*/
382
383 static ssize_t show_engine_leds(struct device *dev,
384 struct device_attribute *attr,
385 char *buf, int nr)
386 {
387 struct i2c_client *client = to_i2c_client(dev);
388 struct lp5523_chip *chip = i2c_get_clientdata(client);
389 char mux[LP5523_LEDS + 1];
390
391 lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
392
393 return sprintf(buf, "%s\n", mux);
394 }
395
396 #define show_leds(nr) \
397 static ssize_t show_engine##nr##_leds(struct device *dev, \
398 struct device_attribute *attr, \
399 char *buf) \
400 { \
401 return show_engine_leds(dev, attr, buf, nr); \
402 }
403 show_leds(1)
404 show_leds(2)
405 show_leds(3)
406
407 static ssize_t store_engine_leds(struct device *dev,
408 struct device_attribute *attr,
409 const char *buf, size_t len, int nr)
410 {
411 struct i2c_client *client = to_i2c_client(dev);
412 struct lp5523_chip *chip = i2c_get_clientdata(client);
413 u16 mux = 0;
414 ssize_t ret;
415
416 if (lp5523_mux_parse(buf, &mux, len))
417 return -EINVAL;
418
419 mutex_lock(&chip->lock);
420 ret = -EINVAL;
421 if (chip->engines[nr - 1].mode != LP5523_CMD_LOAD)
422 goto leave;
423
424 if (lp5523_load_mux(&chip->engines[nr - 1], mux))
425 goto leave;
426
427 ret = len;
428 leave:
429 mutex_unlock(&chip->lock);
430 return ret;
431 }
432
433 #define store_leds(nr) \
434 static ssize_t store_engine##nr##_leds(struct device *dev, \
435 struct device_attribute *attr, \
436 const char *buf, size_t len) \
437 { \
438 return store_engine_leds(dev, attr, buf, len, nr); \
439 }
440 store_leds(1)
441 store_leds(2)
442 store_leds(3)
443
444 static ssize_t lp5523_selftest(struct device *dev,
445 struct device_attribute *attr,
446 char *buf)
447 {
448 struct i2c_client *client = to_i2c_client(dev);
449 struct lp5523_chip *chip = i2c_get_clientdata(client);
450 int i, ret, pos = 0;
451 int led = 0;
452 u8 status, adc, vdd;
453
454 mutex_lock(&chip->lock);
455
456 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
457 if (ret < 0)
458 goto fail;
459
460 /* Check that ext clock is really in use if requested */
461 if ((chip->pdata) && (chip->pdata->clock_mode == LP5523_CLOCK_EXT))
462 if ((status & LP5523_EXT_CLK_USED) == 0)
463 goto fail;
464
465 /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
466 lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL,
467 LP5523_EN_LEDTEST | 16);
468 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
469 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
470 if (ret < 0)
471 goto fail;
472
473 if (!(status & LP5523_LEDTEST_DONE))
474 usleep_range(3000, 6000); /* Was not ready. Wait little bit */
475
476 ret = lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd);
477 if (ret < 0)
478 goto fail;
479
480 vdd--; /* There may be some fluctuation in measurement */
481
482 for (i = 0; i < LP5523_LEDS; i++) {
483 /* Skip non-existing channels */
484 if (chip->pdata->led_config[i].led_current == 0)
485 continue;
486
487 /* Set default current */
488 lp5523_write(chip->client,
489 LP5523_REG_LED_CURRENT_BASE + i,
490 chip->pdata->led_config[i].led_current);
491
492 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff);
493 /* let current stabilize 2 - 4ms before measurements start */
494 usleep_range(2000, 4000);
495 lp5523_write(chip->client,
496 LP5523_REG_LED_TEST_CTRL,
497 LP5523_EN_LEDTEST | i);
498 /* ADC conversion time is 2.7 ms typically */
499 usleep_range(3000, 6000);
500 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
501 if (ret < 0)
502 goto fail;
503
504 if (!(status & LP5523_LEDTEST_DONE))
505 usleep_range(3000, 6000);/* Was not ready. Wait. */
506 ret = lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc);
507 if (ret < 0)
508 goto fail;
509
510 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
511 pos += sprintf(buf + pos, "LED %d FAIL\n", i);
512
513 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00);
514
515 /* Restore current */
516 lp5523_write(chip->client,
517 LP5523_REG_LED_CURRENT_BASE + i,
518 chip->leds[led].led_current);
519 led++;
520 }
521 if (pos == 0)
522 pos = sprintf(buf, "OK\n");
523 goto release_lock;
524 fail:
525 pos = sprintf(buf, "FAIL\n");
526
527 release_lock:
528 mutex_unlock(&chip->lock);
529
530 return pos;
531 }
532
533 static void lp5523_set_brightness(struct led_classdev *cdev,
534 enum led_brightness brightness)
535 {
536 struct lp5523_led *led = cdev_to_led(cdev);
537
538 led->brightness = (u8)brightness;
539
540 schedule_work(&led->brightness_work);
541 }
542
543 static void lp5523_led_brightness_work(struct work_struct *work)
544 {
545 struct lp5523_led *led = container_of(work,
546 struct lp5523_led,
547 brightness_work);
548 struct lp5523_chip *chip = led_to_lp5523(led);
549 struct i2c_client *client = chip->client;
550
551 mutex_lock(&chip->lock);
552
553 lp5523_write(client, LP5523_REG_LED_PWM_BASE + led->chan_nr,
554 led->brightness);
555
556 mutex_unlock(&chip->lock);
557 }
558
559 static int lp5523_do_store_load(struct lp5523_engine *engine,
560 const char *buf, size_t len)
561 {
562 struct lp5523_chip *chip = engine_to_lp5523(engine);
563 struct i2c_client *client = chip->client;
564 int ret, nrchars, offset = 0, i = 0;
565 char c[3];
566 unsigned cmd;
567 u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
568
569 if (engine->mode != LP5523_CMD_LOAD)
570 return -EINVAL;
571
572 while ((offset < len - 1) && (i < LP5523_PROGRAM_LENGTH)) {
573 /* separate sscanfs because length is working only for %s */
574 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
575 ret = sscanf(c, "%2x", &cmd);
576 if (ret != 1)
577 goto fail;
578 pattern[i] = (u8)cmd;
579
580 offset += nrchars;
581 i++;
582 }
583
584 /* Each instruction is 16bit long. Check that length is even */
585 if (i % 2)
586 goto fail;
587
588 mutex_lock(&chip->lock);
589 ret = lp5523_load_program(engine, pattern);
590 mutex_unlock(&chip->lock);
591
592 if (ret) {
593 dev_err(&client->dev, "failed loading pattern\n");
594 return ret;
595 }
596
597 return len;
598 fail:
599 dev_err(&client->dev, "wrong pattern format\n");
600 return -EINVAL;
601 }
602
603 static ssize_t store_engine_load(struct device *dev,
604 struct device_attribute *attr,
605 const char *buf, size_t len, int nr)
606 {
607 struct i2c_client *client = to_i2c_client(dev);
608 struct lp5523_chip *chip = i2c_get_clientdata(client);
609 return lp5523_do_store_load(&chip->engines[nr - 1], buf, len);
610 }
611
612 #define store_load(nr) \
613 static ssize_t store_engine##nr##_load(struct device *dev, \
614 struct device_attribute *attr, \
615 const char *buf, size_t len) \
616 { \
617 return store_engine_load(dev, attr, buf, len, nr); \
618 }
619 store_load(1)
620 store_load(2)
621 store_load(3)
622
623 static ssize_t show_engine_mode(struct device *dev,
624 struct device_attribute *attr,
625 char *buf, int nr)
626 {
627 struct i2c_client *client = to_i2c_client(dev);
628 struct lp5523_chip *chip = i2c_get_clientdata(client);
629 switch (chip->engines[nr - 1].mode) {
630 case LP5523_CMD_RUN:
631 return sprintf(buf, "run\n");
632 case LP5523_CMD_LOAD:
633 return sprintf(buf, "load\n");
634 case LP5523_CMD_DISABLED:
635 return sprintf(buf, "disabled\n");
636 default:
637 return sprintf(buf, "disabled\n");
638 }
639 }
640
641 #define show_mode(nr) \
642 static ssize_t show_engine##nr##_mode(struct device *dev, \
643 struct device_attribute *attr, \
644 char *buf) \
645 { \
646 return show_engine_mode(dev, attr, buf, nr); \
647 }
648 show_mode(1)
649 show_mode(2)
650 show_mode(3)
651
652 static ssize_t store_engine_mode(struct device *dev,
653 struct device_attribute *attr,
654 const char *buf, size_t len, int nr)
655 {
656 struct i2c_client *client = to_i2c_client(dev);
657 struct lp5523_chip *chip = i2c_get_clientdata(client);
658 struct lp5523_engine *engine = &chip->engines[nr - 1];
659 mutex_lock(&chip->lock);
660
661 if (!strncmp(buf, "run", 3))
662 lp5523_set_mode(engine, LP5523_CMD_RUN);
663 else if (!strncmp(buf, "load", 4))
664 lp5523_set_mode(engine, LP5523_CMD_LOAD);
665 else if (!strncmp(buf, "disabled", 8))
666 lp5523_set_mode(engine, LP5523_CMD_DISABLED);
667
668 mutex_unlock(&chip->lock);
669 return len;
670 }
671
672 #define store_mode(nr) \
673 static ssize_t store_engine##nr##_mode(struct device *dev, \
674 struct device_attribute *attr, \
675 const char *buf, size_t len) \
676 { \
677 return store_engine_mode(dev, attr, buf, len, nr); \
678 }
679 store_mode(1)
680 store_mode(2)
681 store_mode(3)
682
683 static ssize_t show_max_current(struct device *dev,
684 struct device_attribute *attr,
685 char *buf)
686 {
687 struct led_classdev *led_cdev = dev_get_drvdata(dev);
688 struct lp5523_led *led = cdev_to_led(led_cdev);
689
690 return sprintf(buf, "%d\n", led->max_current);
691 }
692
693 static ssize_t show_current(struct device *dev,
694 struct device_attribute *attr,
695 char *buf)
696 {
697 struct led_classdev *led_cdev = dev_get_drvdata(dev);
698 struct lp5523_led *led = cdev_to_led(led_cdev);
699
700 return sprintf(buf, "%d\n", led->led_current);
701 }
702
703 static ssize_t store_current(struct device *dev,
704 struct device_attribute *attr,
705 const char *buf, size_t len)
706 {
707 struct led_classdev *led_cdev = dev_get_drvdata(dev);
708 struct lp5523_led *led = cdev_to_led(led_cdev);
709 struct lp5523_chip *chip = led_to_lp5523(led);
710 ssize_t ret;
711 unsigned long curr;
712
713 if (kstrtoul(buf, 0, &curr))
714 return -EINVAL;
715
716 if (curr > led->max_current)
717 return -EINVAL;
718
719 mutex_lock(&chip->lock);
720 ret = lp5523_write(chip->client,
721 LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
722 (u8)curr);
723 mutex_unlock(&chip->lock);
724
725 if (ret < 0)
726 return ret;
727
728 led->led_current = (u8)curr;
729
730 return len;
731 }
732
733 /* led class device attributes */
734 static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current);
735 static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
736
737 static struct attribute *lp5523_led_attributes[] = {
738 &dev_attr_led_current.attr,
739 &dev_attr_max_current.attr,
740 NULL,
741 };
742
743 static struct attribute_group lp5523_led_attribute_group = {
744 .attrs = lp5523_led_attributes
745 };
746
747 /* device attributes */
748 static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR,
749 show_engine1_mode, store_engine1_mode);
750 static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR,
751 show_engine2_mode, store_engine2_mode);
752 static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR,
753 show_engine3_mode, store_engine3_mode);
754 static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUSR,
755 show_engine1_leds, store_engine1_leds);
756 static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUSR,
757 show_engine2_leds, store_engine2_leds);
758 static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUSR,
759 show_engine3_leds, store_engine3_leds);
760 static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load);
761 static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load);
762 static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load);
763 static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL);
764
765 static struct attribute *lp5523_attributes[] = {
766 &dev_attr_engine1_mode.attr,
767 &dev_attr_engine2_mode.attr,
768 &dev_attr_engine3_mode.attr,
769 &dev_attr_selftest.attr,
770 &dev_attr_engine1_load.attr,
771 &dev_attr_engine1_leds.attr,
772 &dev_attr_engine2_load.attr,
773 &dev_attr_engine2_leds.attr,
774 &dev_attr_engine3_load.attr,
775 &dev_attr_engine3_leds.attr,
776 NULL,
777 };
778
779 static const struct attribute_group lp5523_group = {
780 .attrs = lp5523_attributes,
781 };
782
783 static int lp5523_register_sysfs(struct i2c_client *client)
784 {
785 struct device *dev = &client->dev;
786 int ret;
787
788 ret = sysfs_create_group(&dev->kobj, &lp5523_group);
789 if (ret < 0)
790 return ret;
791
792 return 0;
793 }
794
795 static void lp5523_unregister_sysfs(struct i2c_client *client)
796 {
797 struct lp5523_chip *chip = i2c_get_clientdata(client);
798 struct device *dev = &client->dev;
799 int i;
800
801 sysfs_remove_group(&dev->kobj, &lp5523_group);
802
803 for (i = 0; i < chip->num_leds; i++)
804 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
805 &lp5523_led_attribute_group);
806 }
807
808 /*--------------------------------------------------------------*/
809 /* Set chip operating mode */
810 /*--------------------------------------------------------------*/
811 static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode)
812 {
813 /* if in that mode already do nothing, except for run */
814 if (mode == engine->mode && mode != LP5523_CMD_RUN)
815 return;
816
817 switch (mode) {
818 case LP5523_CMD_RUN:
819 lp5523_run_program(engine);
820 break;
821 case LP5523_CMD_LOAD:
822 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
823 lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
824 break;
825 case LP5523_CMD_DISABLED:
826 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
827 break;
828 default:
829 return;
830 }
831
832 engine->mode = mode;
833 }
834
835 /*--------------------------------------------------------------*/
836 /* Probe, Attach, Remove */
837 /*--------------------------------------------------------------*/
838 static int __init lp5523_init_engine(struct lp5523_engine *engine, int id)
839 {
840 if (id < 1 || id > LP5523_ENGINES)
841 return -1;
842 engine->id = id;
843 engine->engine_mask = LP5523_ENG_MASK_BASE >> SHIFT_MASK(id);
844 engine->prog_page = id - 1;
845 engine->mux_page = id + 2;
846
847 return 0;
848 }
849
850 static int lp5523_init_led(struct lp5523_led *led, struct device *dev,
851 int chan, struct lp5523_platform_data *pdata,
852 const char *chip_name)
853 {
854 char name[32];
855 int res;
856
857 if (chan >= LP5523_LEDS)
858 return -EINVAL;
859
860 if (pdata->led_config[chan].led_current) {
861 led->led_current = pdata->led_config[chan].led_current;
862 led->max_current = pdata->led_config[chan].max_current;
863 led->chan_nr = pdata->led_config[chan].chan_nr;
864
865 if (led->chan_nr >= LP5523_LEDS) {
866 dev_err(dev, "Use channel numbers between 0 and %d\n",
867 LP5523_LEDS - 1);
868 return -EINVAL;
869 }
870
871 if (pdata->led_config[chan].name) {
872 led->cdev.name = pdata->led_config[chan].name;
873 } else {
874 snprintf(name, sizeof(name), "%s:channel%d",
875 pdata->label ? : chip_name, chan);
876 led->cdev.name = name;
877 }
878
879 led->cdev.brightness_set = lp5523_set_brightness;
880 res = led_classdev_register(dev, &led->cdev);
881 if (res < 0) {
882 dev_err(dev, "couldn't register led on channel %d\n",
883 chan);
884 return res;
885 }
886 res = sysfs_create_group(&led->cdev.dev->kobj,
887 &lp5523_led_attribute_group);
888 if (res < 0) {
889 dev_err(dev, "couldn't register current attribute\n");
890 led_classdev_unregister(&led->cdev);
891 return res;
892 }
893 } else {
894 led->led_current = 0;
895 }
896 return 0;
897 }
898
899 static int lp5523_probe(struct i2c_client *client,
900 const struct i2c_device_id *id)
901 {
902 struct lp5523_chip *chip;
903 struct lp5523_platform_data *pdata;
904 int ret, i, led;
905
906 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
907 if (!chip)
908 return -ENOMEM;
909
910 i2c_set_clientdata(client, chip);
911 chip->client = client;
912
913 pdata = client->dev.platform_data;
914
915 if (!pdata) {
916 dev_err(&client->dev, "no platform data\n");
917 return -EINVAL;
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 return ret;
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 fail1;
945
946 dev_info(&client->dev, "%s Programmable led chip found\n", id->name);
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 fail1;
954 }
955 }
956 ret = lp5523_configure(client);
957 if (ret < 0) {
958 dev_err(&client->dev, "error configuring chip\n");
959 goto fail1;
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 INIT_WORK(&chip->leds[led].brightness_work,
972 lp5523_led_brightness_work);
973
974 ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata,
975 id->name);
976 if (ret) {
977 dev_err(&client->dev, "error initializing leds\n");
978 goto fail2;
979 }
980 chip->num_leds++;
981
982 chip->leds[led].id = led;
983 /* Set LED current */
984 lp5523_write(client,
985 LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
986 chip->leds[led].led_current);
987
988 led++;
989 }
990
991 ret = lp5523_register_sysfs(client);
992 if (ret) {
993 dev_err(&client->dev, "registering sysfs failed\n");
994 goto fail2;
995 }
996 return ret;
997 fail2:
998 for (i = 0; i < chip->num_leds; i++) {
999 led_classdev_unregister(&chip->leds[i].cdev);
1000 flush_work(&chip->leds[i].brightness_work);
1001 }
1002 fail1:
1003 if (pdata->enable)
1004 pdata->enable(0);
1005 if (pdata->release_resources)
1006 pdata->release_resources();
1007 return ret;
1008 }
1009
1010 static int lp5523_remove(struct i2c_client *client)
1011 {
1012 struct lp5523_chip *chip = i2c_get_clientdata(client);
1013 int i;
1014
1015 /* Disable engine mode */
1016 lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED);
1017
1018 lp5523_unregister_sysfs(client);
1019
1020 for (i = 0; i < chip->num_leds; i++) {
1021 led_classdev_unregister(&chip->leds[i].cdev);
1022 flush_work(&chip->leds[i].brightness_work);
1023 }
1024
1025 if (chip->pdata->enable)
1026 chip->pdata->enable(0);
1027 if (chip->pdata->release_resources)
1028 chip->pdata->release_resources();
1029 return 0;
1030 }
1031
1032 static const struct i2c_device_id lp5523_id[] = {
1033 { "lp5523", LP5523 },
1034 { "lp55231", LP55231 },
1035 { }
1036 };
1037
1038 MODULE_DEVICE_TABLE(i2c, lp5523_id);
1039
1040 static struct i2c_driver lp5523_driver = {
1041 .driver = {
1042 .name = "lp5523x",
1043 },
1044 .probe = lp5523_probe,
1045 .remove = lp5523_remove,
1046 .id_table = lp5523_id,
1047 };
1048
1049 module_i2c_driver(lp5523_driver);
1050
1051 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
1052 MODULE_DESCRIPTION("LP5523 LED engine");
1053 MODULE_LICENSE("GPL");
Linux with added FPC-III support