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leds-lp55xx: add device reset function in lp5521/5523
[deliverable/linux.git] / drivers / leds / leds-lp5523.c
CommitLineData
0efba16c
SO		 1/*
2 * lp5523.c - LP5523 LED Driver
3 *
4 * Copyright (C) 2010 Nokia Corporation
5 *
6 * Contact: Samu Onkalo <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
27d7704e
KM		 107enum lp5523_chip_id {
108 LP5523,
109 LP55231,
110};
111
0efba16c 112struct lp5523_engine {
0efba16c
SO		 113 int id;
114 u8 mode;
115 u8 prog_page;
116 u8 mux_page;
117 u16 led_mux;
118 u8 engine_mask;
119};
120
121struct 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
131struct 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
87dbf623
SO		 141static inline struct lp5523_led *cdev_to_led(struct led_classdev *cdev)
142{
143 return container_of(cdev, struct lp5523_led, cdev);
144}
0efba16c 145
87dbf623 146static inline struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine)
0efba16c
SO		 147{
148 return container_of(engine, struct lp5523_chip,
149 engines[engine->id - 1]);
150}
151
87dbf623 152static inline struct lp5523_chip *led_to_lp5523(struct lp5523_led *led)
0efba16c
SO		 153{
154 return container_of(led, struct lp5523_chip,
155 leds[led->id]);
156}
157
6f6365fb 158static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode);
0efba16c 159static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode);
d06cb46c 160static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern);
0efba16c
SO		 161
162static void lp5523_led_brightness_work(struct work_struct *work);
163
164static int lp5523_write(struct i2c_client *client, u8 reg, u8 value)
165{
166 return i2c_smbus_write_byte_data(client, reg, value);
167}
168
169static 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)
5ebab74a 174 return ret;
0efba16c
SO		 175
176 *buf = ret;
177 return 0;
178}
179
180static int lp5523_detect(struct i2c_client *client)
181{
182 int ret;
183 u8 buf;
184
469eba02 185 ret = lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE);
0efba16c
SO		 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
197static 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 */
d06cb46c 204 static const u8 pattern[][LP5523_PROGRAM_LENGTH] = {
0efba16c
SO		 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
0efba16c 210 ret |= lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE);
2e4840ed
SO		 211 /* Chip startup time is 500 us, 1 - 2 ms gives some margin */
212 usleep_range(1000, 2000);
0efba16c
SO		 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
2e4840ed
SO		 249 /* Let the programs run for couple of ms and check the engine status */
250 usleep_range(3000, 6000);
1b21ec5a
JH		 251 ret = lp5523_read(client, LP5523_REG_STATUS, &status);
252 if (ret < 0)
253 return ret;
254
0efba16c
SO		 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
272static 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);
291fail:
292 return ret;
293}
294
295static 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
d06cb46c 312static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern)
0efba16c
SO		 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
329static 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);
341fail:
342 return ret;
343}
344
345static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
346{
347 int i;
348 u16 tmp_mux = 0;
469eba02
KM		 349
350 len = min_t(int, len, LP5523_LEDS);
0efba16c
SO		 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
370static 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
383static 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) \
397static 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}
403show_leds(1)
404show_leds(2)
405show_leds(3)
406
407static 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;
fbac0812 414 ssize_t ret;
0efba16c
SO		 415
416 if (lp5523_mux_parse(buf, &mux, len))
417 return -EINVAL;
418
fbac0812
SO		 419 mutex_lock(&chip->lock);
420 ret = -EINVAL;
421 if (chip->engines[nr - 1].mode != LP5523_CMD_LOAD)
422 goto leave;
423
0efba16c 424 if (lp5523_load_mux(&chip->engines[nr - 1], mux))
fbac0812 425 goto leave;
0efba16c 426
fbac0812
SO		 427 ret = len;
428leave:
429 mutex_unlock(&chip->lock);
430 return ret;
0efba16c
SO		 431}
432
433#define store_leds(nr) \
434static 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}
440store_leds(1)
441store_leds(2)
442store_leds(3)
443
444static 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);
2e4840ed 468 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
0efba16c 469 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
1b21ec5a
JH		 470 if (ret < 0)
471 goto fail;
472
0efba16c 473 if (!(status & LP5523_LEDTEST_DONE))
2e4840ed 474 usleep_range(3000, 6000); /* Was not ready. Wait little bit */
0efba16c 475
1b21ec5a
JH		 476 ret = lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd);
477 if (ret < 0)
478 goto fail;
479
0efba16c
SO		 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);
2e4840ed
SO		 493 /* let current stabilize 2 - 4ms before measurements start */
494 usleep_range(2000, 4000);
0efba16c
SO		 495 lp5523_write(chip->client,
496 LP5523_REG_LED_TEST_CTRL,
497 LP5523_EN_LEDTEST | i);
2e4840ed
SO		 498 /* ADC conversion time is 2.7 ms typically */
499 usleep_range(3000, 6000);
0efba16c 500 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
1b21ec5a
JH		 501 if (ret < 0)
502 goto fail;
503
0efba16c 504 if (!(status & LP5523_LEDTEST_DONE))
2e4840ed 505 usleep_range(3000, 6000);/* Was not ready. Wait. */
1b21ec5a
JH		 506 ret = lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc);
507 if (ret < 0)
508 goto fail;
0efba16c
SO		 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;
524fail:
525 pos = sprintf(buf, "FAIL\n");
526
527release_lock:
528 mutex_unlock(&chip->lock);
529
530 return pos;
531}
532
533static 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
543static 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
559static 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
469eba02
KM		 569 if (engine->mode != LP5523_CMD_LOAD)
570 return -EINVAL;
571
0efba16c
SO		 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);
469eba02 589 ret = lp5523_load_program(engine, pattern);
0efba16c
SO		 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;
598fail:
599 dev_err(&client->dev, "wrong pattern format\n");
600 return -EINVAL;
601}
602
603static 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) \
613static 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}
619store_load(1)
620store_load(2)
621store_load(3)
622
623static 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) \
642static 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}
648show_mode(1)
649show_mode(2)
650show_mode(3)
651
652static 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) \
673static 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}
679store_mode(1)
680store_mode(2)
681store_mode(3)
682
683static 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
693static 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
703static 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
eef4aa65 713 if (kstrtoul(buf, 0, &curr))
0efba16c
SO		 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 */
ccd7510f 734static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current);
0efba16c
SO		 735static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
736
737static struct attribute *lp5523_led_attributes[] = {
738 &dev_attr_led_current.attr,
739 &dev_attr_max_current.attr,
740 NULL,
741};
742
743static struct attribute_group lp5523_led_attribute_group = {
744 .attrs = lp5523_led_attributes
745};
746
747/* device attributes */
ccd7510f 748static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR,
0efba16c 749 show_engine1_mode, store_engine1_mode);
ccd7510f 750static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR,
0efba16c 751 show_engine2_mode, store_engine2_mode);
ccd7510f 752static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR,
0efba16c 753 show_engine3_mode, store_engine3_mode);
ccd7510f 754static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUSR,
0efba16c 755 show_engine1_leds, store_engine1_leds);
ccd7510f 756static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUSR,
0efba16c 757 show_engine2_leds, store_engine2_leds);
ccd7510f 758static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUSR,
0efba16c 759 show_engine3_leds, store_engine3_leds);
ccd7510f
VK		 760static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load);
761static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load);
762static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load);
0efba16c
SO		 763static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL);
764
765static 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,
0efba16c
SO		 770 &dev_attr_engine1_load.attr,
771 &dev_attr_engine1_leds.attr,
0efba16c
SO		 772 &dev_attr_engine2_load.attr,
773 &dev_attr_engine2_leds.attr,
0efba16c
SO		 774 &dev_attr_engine3_load.attr,
775 &dev_attr_engine3_leds.attr,
f1625842 776 NULL,
0efba16c
SO		 777};
778
779static const struct attribute_group lp5523_group = {
780 .attrs = lp5523_attributes,
781};
782
0efba16c
SO		 783static 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
795static 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
0efba16c
SO		 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/*--------------------------------------------------------------*/
6f6365fb 811static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode)
0efba16c 812{
0efba16c
SO		 813 /* if in that mode already do nothing, except for run */
814 if (mode == engine->mode && mode != LP5523_CMD_RUN)
6f6365fb 815 return;
0efba16c 816
6f6365fb
KM		 817 switch (mode) {
818 case LP5523_CMD_RUN:
819 lp5523_run_program(engine);
820 break;
821 case LP5523_CMD_LOAD:
0efba16c
SO		 822 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
823 lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
6f6365fb
KM		 824 break;
825 case LP5523_CMD_DISABLED:
0efba16c 826 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
6f6365fb
KM		 827 break;
828 default:
829 return;
0efba16c
SO		 830 }
831
0efba16c 832 engine->mode = mode;
0efba16c
SO		 833}
834
835/*--------------------------------------------------------------*/
836/* Probe, Attach, Remove */
837/*--------------------------------------------------------------*/
838static 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;
0efba16c
SO		 846
847 return 0;
848}
849
98ea1ea2 850static int lp5523_init_led(struct lp5523_led *led, struct device *dev,
56a1e9ad
KM		 851 int chan, struct lp5523_platform_data *pdata,
852 const char *chip_name)
0efba16c
SO		 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
94b43b67
KM		 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",
56a1e9ad 875 pdata->label ? : chip_name, chan);
94b43b67
KM		 876 led->cdev.name = name;
877 }
0efba16c 878
0efba16c
SO		 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
f6524808
MWK		 899static int lp5523_register_leds(struct lp5523_chip *chip, const char *name)
900{
901 struct lp5523_platform_data *pdata = chip->pdata;
902 struct i2c_client *client = chip->client;
903 int i;
904 int led;
905 int ret;
906
907 /* Initialize leds */
908 chip->num_channels = pdata->num_channels;
909 chip->num_leds = 0;
910 led = 0;
911 for (i = 0; i < pdata->num_channels; i++) {
912 /* Do not initialize channels that are not connected */
913 if (pdata->led_config[i].led_current == 0)
914 continue;
915
916 INIT_WORK(&chip->leds[led].brightness_work,
917 lp5523_led_brightness_work);
918
919 ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata,
920 name);
921 if (ret) {
922 dev_err(&client->dev, "error initializing leds\n");
923 return ret;
924 }
925 chip->num_leds++;
926
927 chip->leds[led].id = led;
928 /* Set LED current */
929 lp5523_write(client,
930 LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
931 chip->leds[led].led_current);
932
933 led++;
934 }
935
936 return 0;
937}
938
1904f83d
MWK		 939static void lp5523_unregister_leds(struct lp5523_chip *chip)
940{
941 int i;
942
943 for (i = 0; i < chip->num_leds; i++) {
944 led_classdev_unregister(&chip->leds[i].cdev);
945 flush_work(&chip->leds[i].brightness_work);
946 }
947}
948
86eb7748
MWK		 949static void lp5523_reset_device(struct lp5523_chip *chip)
950{
951 struct i2c_client *client = chip->client;
952
953 lp5523_write(client, LP5523_REG_RESET, 0xff);
954}
955
944f7b1d
MWK		 956static int lp5523_init_device(struct lp5523_chip *chip)
957{
958 struct lp5523_platform_data *pdata = chip->pdata;
959 struct i2c_client *client = chip->client;
960 int ret;
961
962 if (pdata->setup_resources) {
963 ret = pdata->setup_resources();
964 if (ret < 0)
965 return ret;
966 }
967
968 if (pdata->enable) {
969 pdata->enable(0);
970 usleep_range(1000, 2000); /* Keep enable down at least 1ms */
971 pdata->enable(1);
972 usleep_range(1000, 2000); /* 500us abs min. */
973 }
974
86eb7748
MWK		 975 lp5523_reset_device(chip);
976
944f7b1d
MWK		 977 usleep_range(10000, 20000); /*
978 * Exact value is not available. 10 - 20ms
979 * appears to be enough for reset.
980 */
981 return lp5523_detect(client);
982}
983
1a991485
MWK		 984static void lp5523_deinit_device(struct lp5523_chip *chip)
985{
986 struct lp5523_platform_data *pdata = chip->pdata;
987
988 if (pdata->enable)
989 pdata->enable(0);
990 if (pdata->release_resources)
991 pdata->release_resources();
992}
993
98ea1ea2 994static int lp5523_probe(struct i2c_client *client,
0efba16c
SO		 995 const struct i2c_device_id *id)
996{
997 struct lp5523_chip *chip;
998 struct lp5523_platform_data *pdata;
f6524808 999 int ret, i;
0efba16c 1000
94ca4bcc 1001 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
0efba16c
SO		 1002 if (!chip)
1003 return -ENOMEM;
1004
1005 i2c_set_clientdata(client, chip);
1006 chip->client = client;
1007
1008 pdata = client->dev.platform_data;
1009
1010 if (!pdata) {
1011 dev_err(&client->dev, "no platform data\n");
94ca4bcc 1012 return -EINVAL;
0efba16c
SO		 1013 }
1014
1015 mutex_init(&chip->lock);
1016
1017 chip->pdata = pdata;
1018
944f7b1d 1019 ret = lp5523_init_device(chip);
0efba16c 1020 if (ret)
94ca4bcc 1021 goto fail1;
0efba16c 1022
56a1e9ad 1023 dev_info(&client->dev, "%s Programmable led chip found\n", id->name);
0efba16c
SO		 1024
1025 /* Initialize engines */
1026 for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
1027 ret = lp5523_init_engine(&chip->engines[i], i + 1);
1028 if (ret) {
1029 dev_err(&client->dev, "error initializing engine\n");
94ca4bcc 1030 goto fail1;
0efba16c
SO		 1031 }
1032 }
1033 ret = lp5523_configure(client);
1034 if (ret < 0) {
1035 dev_err(&client->dev, "error configuring chip\n");
94ca4bcc 1036 goto fail1;
0efba16c
SO		 1037 }
1038
f6524808
MWK		 1039 ret = lp5523_register_leds(chip, id->name);
1040 if (ret)
1041 goto fail2;
0efba16c
SO		 1042
1043 ret = lp5523_register_sysfs(client);
1044 if (ret) {
1045 dev_err(&client->dev, "registering sysfs failed\n");
94ca4bcc 1046 goto fail2;
0efba16c
SO		 1047 }
1048 return ret;
94ca4bcc 1049fail2:
1904f83d 1050 lp5523_unregister_leds(chip);
94ca4bcc 1051fail1:
1a991485 1052 lp5523_deinit_device(chip);
0efba16c
SO		 1053 return ret;
1054}
1055
1056static int lp5523_remove(struct i2c_client *client)
1057{
1058 struct lp5523_chip *chip = i2c_get_clientdata(client);
0efba16c 1059
23301b7f
KM		 1060 /* Disable engine mode */
1061 lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED);
1062
0efba16c
SO		 1063 lp5523_unregister_sysfs(client);
1064
1904f83d 1065 lp5523_unregister_leds(chip);
0efba16c 1066
1a991485 1067 lp5523_deinit_device(chip);
0efba16c
SO		 1068 return 0;
1069}
1070
1071static const struct i2c_device_id lp5523_id[] = {
27d7704e
KM		 1072 { "lp5523", LP5523 },
1073 { "lp55231", LP55231 },
0efba16c
SO		 1074 { }
1075};
1076
1077MODULE_DEVICE_TABLE(i2c, lp5523_id);
1078
1079static struct i2c_driver lp5523_driver = {
1080 .driver = {
27d7704e 1081 .name = "lp5523x",
0efba16c
SO		 1082 },
1083 .probe = lp5523_probe,
1084 .remove = lp5523_remove,
1085 .id_table = lp5523_id,
1086};
1087
09a0d183 1088module_i2c_driver(lp5523_driver);
0efba16c
SO		 1089
1090MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
1091MODULE_DESCRIPTION("LP5523 LED engine");
1092MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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