2 * lp5523.c - LP5523 LED Driver
4 * Copyright (C) 2010 Nokia Corporation
6 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
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.
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.
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
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>
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
72 #define LP5523_CMD_LOAD 0x15 /* 00010101 */
73 #define LP5523_CMD_RUN 0x2a /* 00101010 */
74 #define LP5523_CMD_DISABLED 0x00 /* 00000000 */
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
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
94 #define LP5523_ENGINES 3
96 #define LP5523_ENG_MASK_BASE 0x30 /* 00110000 */
98 #define LP5523_ENG_STATUS_MASK 0x07 /* 00000111 */
100 #define LP5523_IRQ_FLAGS IRQF_TRIGGER_FALLING
102 #define LP5523_EXT_CLK_USED 0x08
104 #define LED_ACTIVE(mux, led) (!!(mux & (0x0001 << led)))
105 #define SHIFT_MASK(id) (((id) - 1) * 2)
107 struct lp5523_engine {
108 const struct attribute_group *attributes;
122 struct led_classdev cdev;
123 struct work_struct brightness_work;
128 struct mutex lock; /* Serialize control */
129 struct i2c_client *client;
130 struct lp5523_engine engines[LP5523_ENGINES];
131 struct lp5523_led leds[LP5523_LEDS];
132 struct lp5523_platform_data *pdata;
137 static inline struct lp5523_led *cdev_to_led(struct led_classdev *cdev)
139 return container_of(cdev, struct lp5523_led, cdev);
142 static inline struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine)
144 return container_of(engine, struct lp5523_chip,
145 engines[engine->id - 1]);
148 static inline struct lp5523_chip *led_to_lp5523(struct lp5523_led *led)
150 return container_of(led, struct lp5523_chip,
154 static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode);
155 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode);
156 static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern);
158 static void lp5523_led_brightness_work(struct work_struct *work);
160 static int lp5523_write(struct i2c_client *client, u8 reg, u8 value)
162 return i2c_smbus_write_byte_data(client, reg, value);
165 static int lp5523_read(struct i2c_client *client, u8 reg, u8 *buf)
167 s32 ret = i2c_smbus_read_byte_data(client, reg);
176 static int lp5523_detect(struct i2c_client *client)
181 ret = lp5523_write(client, LP5523_REG_ENABLE, 0x40);
184 ret = lp5523_read(client, LP5523_REG_ENABLE, &buf);
193 static int lp5523_configure(struct i2c_client *client)
195 struct lp5523_chip *chip = i2c_get_clientdata(client);
199 /* one pattern per engine setting led mux start and stop addresses */
200 u8 pattern[][LP5523_PROGRAM_LENGTH] = {
201 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
202 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
203 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
206 ret |= lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE);
207 /* Chip startup time is 500 us, 1 - 2 ms gives some margin */
208 usleep_range(1000, 2000);
210 ret |= lp5523_write(client, LP5523_REG_CONFIG,
211 LP5523_AUTO_INC | LP5523_PWR_SAVE |
212 LP5523_CP_AUTO | LP5523_AUTO_CLK |
213 LP5523_PWM_PWR_SAVE);
215 /* turn on all leds */
216 ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
217 ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
219 /* hardcode 32 bytes of memory for each engine from program memory */
220 ret |= lp5523_write(client, LP5523_REG_CH1_PROG_START, 0x00);
221 ret |= lp5523_write(client, LP5523_REG_CH2_PROG_START, 0x10);
222 ret |= lp5523_write(client, LP5523_REG_CH3_PROG_START, 0x20);
224 /* write led mux address space for each channel */
225 ret |= lp5523_load_program(&chip->engines[0], pattern[0]);
226 ret |= lp5523_load_program(&chip->engines[1], pattern[1]);
227 ret |= lp5523_load_program(&chip->engines[2], pattern[2]);
230 dev_err(&client->dev, "could not load mux programs\n");
234 /* set all engines exec state and mode to run 00101010 */
235 ret |= lp5523_write(client, LP5523_REG_ENABLE,
236 (LP5523_CMD_RUN | LP5523_ENABLE));
238 ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_RUN);
241 dev_err(&client->dev, "could not start mux programs\n");
245 /* Let the programs run for couple of ms and check the engine status */
246 usleep_range(3000, 6000);
247 lp5523_read(client, LP5523_REG_STATUS, &status);
248 status &= LP5523_ENG_STATUS_MASK;
250 if (status == LP5523_ENG_STATUS_MASK) {
251 dev_dbg(&client->dev, "all engines configured\n");
253 dev_info(&client->dev, "status == %x\n", status);
254 dev_err(&client->dev, "cound not configure LED engine\n");
258 dev_info(&client->dev, "disabling engines\n");
260 ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED);
265 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode)
267 struct lp5523_chip *chip = engine_to_lp5523(engine);
268 struct i2c_client *client = chip->client;
272 ret = lp5523_read(client, LP5523_REG_OP_MODE, &engine_state);
276 engine_state &= ~(engine->engine_mask);
278 /* set mode only for this engine */
279 mode &= engine->engine_mask;
281 engine_state |= mode;
283 ret |= lp5523_write(client, LP5523_REG_OP_MODE, engine_state);
288 static int lp5523_load_mux(struct lp5523_engine *engine, u16 mux)
290 struct lp5523_chip *chip = engine_to_lp5523(engine);
291 struct i2c_client *client = chip->client;
294 ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
296 ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, engine->mux_page);
297 ret |= lp5523_write(client, LP5523_REG_PROG_MEM,
299 ret |= lp5523_write(client, LP5523_REG_PROG_MEM + 1, (u8)(mux));
300 engine->led_mux = mux;
305 static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern)
307 struct lp5523_chip *chip = engine_to_lp5523(engine);
308 struct i2c_client *client = chip->client;
312 ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
314 ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL,
316 ret |= i2c_smbus_write_i2c_block_data(client, LP5523_REG_PROG_MEM,
317 LP5523_PROGRAM_LENGTH, pattern);
322 static int lp5523_run_program(struct lp5523_engine *engine)
324 struct lp5523_chip *chip = engine_to_lp5523(engine);
325 struct i2c_client *client = chip->client;
328 ret = lp5523_write(client, LP5523_REG_ENABLE,
329 LP5523_CMD_RUN | LP5523_ENABLE);
333 ret = lp5523_set_engine_mode(engine, LP5523_CMD_RUN);
338 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
342 len = len < LP5523_LEDS ? len : LP5523_LEDS;
343 for (i = 0; i < len; i++) {
362 static void lp5523_mux_to_array(u16 led_mux, char *array)
365 for (i = 0; i < LP5523_LEDS; i++)
366 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
371 /*--------------------------------------------------------------*/
372 /* Sysfs interface */
373 /*--------------------------------------------------------------*/
375 static ssize_t show_engine_leds(struct device *dev,
376 struct device_attribute *attr,
379 struct i2c_client *client = to_i2c_client(dev);
380 struct lp5523_chip *chip = i2c_get_clientdata(client);
381 char mux[LP5523_LEDS + 1];
383 lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
385 return sprintf(buf, "%s\n", mux);
388 #define show_leds(nr) \
389 static ssize_t show_engine##nr##_leds(struct device *dev, \
390 struct device_attribute *attr, \
393 return show_engine_leds(dev, attr, buf, nr); \
399 static ssize_t store_engine_leds(struct device *dev,
400 struct device_attribute *attr,
401 const char *buf, size_t len, int nr)
403 struct i2c_client *client = to_i2c_client(dev);
404 struct lp5523_chip *chip = i2c_get_clientdata(client);
407 if (lp5523_mux_parse(buf, &mux, len))
410 if (lp5523_load_mux(&chip->engines[nr - 1], mux))
416 #define store_leds(nr) \
417 static ssize_t store_engine##nr##_leds(struct device *dev, \
418 struct device_attribute *attr, \
419 const char *buf, size_t len) \
421 return store_engine_leds(dev, attr, buf, len, nr); \
427 static ssize_t lp5523_selftest(struct device *dev,
428 struct device_attribute *attr,
431 struct i2c_client *client = to_i2c_client(dev);
432 struct lp5523_chip *chip = i2c_get_clientdata(client);
437 mutex_lock(&chip->lock);
439 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
443 /* Check that ext clock is really in use if requested */
444 if ((chip->pdata) && (chip->pdata->clock_mode == LP5523_CLOCK_EXT))
445 if ((status & LP5523_EXT_CLK_USED) == 0)
448 /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
449 lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL,
450 LP5523_EN_LEDTEST | 16);
451 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
452 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
453 if (!(status & LP5523_LEDTEST_DONE))
454 usleep_range(3000, 6000); /* Was not ready. Wait little bit */
456 ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd);
457 vdd--; /* There may be some fluctuation in measurement */
459 for (i = 0; i < LP5523_LEDS; i++) {
460 /* Skip non-existing channels */
461 if (chip->pdata->led_config[i].led_current == 0)
464 /* Set default current */
465 lp5523_write(chip->client,
466 LP5523_REG_LED_CURRENT_BASE + i,
467 chip->pdata->led_config[i].led_current);
469 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff);
470 /* let current stabilize 2 - 4ms before measurements start */
471 usleep_range(2000, 4000);
472 lp5523_write(chip->client,
473 LP5523_REG_LED_TEST_CTRL,
474 LP5523_EN_LEDTEST | i);
475 /* ADC conversion time is 2.7 ms typically */
476 usleep_range(3000, 6000);
477 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
478 if (!(status & LP5523_LEDTEST_DONE))
479 usleep_range(3000, 6000);/* Was not ready. Wait. */
480 ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc);
482 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
483 pos += sprintf(buf + pos, "LED %d FAIL\n", i);
485 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00);
487 /* Restore current */
488 lp5523_write(chip->client,
489 LP5523_REG_LED_CURRENT_BASE + i,
490 chip->leds[led].led_current);
494 pos = sprintf(buf, "OK\n");
497 pos = sprintf(buf, "FAIL\n");
500 mutex_unlock(&chip->lock);
505 static void lp5523_set_brightness(struct led_classdev *cdev,
506 enum led_brightness brightness)
508 struct lp5523_led *led = cdev_to_led(cdev);
510 led->brightness = (u8)brightness;
512 schedule_work(&led->brightness_work);
515 static void lp5523_led_brightness_work(struct work_struct *work)
517 struct lp5523_led *led = container_of(work,
520 struct lp5523_chip *chip = led_to_lp5523(led);
521 struct i2c_client *client = chip->client;
523 mutex_lock(&chip->lock);
525 lp5523_write(client, LP5523_REG_LED_PWM_BASE + led->chan_nr,
528 mutex_unlock(&chip->lock);
531 static int lp5523_do_store_load(struct lp5523_engine *engine,
532 const char *buf, size_t len)
534 struct lp5523_chip *chip = engine_to_lp5523(engine);
535 struct i2c_client *client = chip->client;
536 int ret, nrchars, offset = 0, i = 0;
539 u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
541 while ((offset < len - 1) && (i < LP5523_PROGRAM_LENGTH)) {
542 /* separate sscanfs because length is working only for %s */
543 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
544 ret = sscanf(c, "%2x", &cmd);
547 pattern[i] = (u8)cmd;
553 /* Each instruction is 16bit long. Check that length is even */
557 mutex_lock(&chip->lock);
559 ret = lp5523_load_program(engine, pattern);
560 mutex_unlock(&chip->lock);
563 dev_err(&client->dev, "failed loading pattern\n");
569 dev_err(&client->dev, "wrong pattern format\n");
573 static ssize_t store_engine_load(struct device *dev,
574 struct device_attribute *attr,
575 const char *buf, size_t len, int nr)
577 struct i2c_client *client = to_i2c_client(dev);
578 struct lp5523_chip *chip = i2c_get_clientdata(client);
579 return lp5523_do_store_load(&chip->engines[nr - 1], buf, len);
582 #define store_load(nr) \
583 static ssize_t store_engine##nr##_load(struct device *dev, \
584 struct device_attribute *attr, \
585 const char *buf, size_t len) \
587 return store_engine_load(dev, attr, buf, len, nr); \
593 static ssize_t show_engine_mode(struct device *dev,
594 struct device_attribute *attr,
597 struct i2c_client *client = to_i2c_client(dev);
598 struct lp5523_chip *chip = i2c_get_clientdata(client);
599 switch (chip->engines[nr - 1].mode) {
601 return sprintf(buf, "run\n");
602 case LP5523_CMD_LOAD:
603 return sprintf(buf, "load\n");
604 case LP5523_CMD_DISABLED:
605 return sprintf(buf, "disabled\n");
607 return sprintf(buf, "disabled\n");
611 #define show_mode(nr) \
612 static ssize_t show_engine##nr##_mode(struct device *dev, \
613 struct device_attribute *attr, \
616 return show_engine_mode(dev, attr, buf, nr); \
622 static ssize_t store_engine_mode(struct device *dev,
623 struct device_attribute *attr,
624 const char *buf, size_t len, int nr)
626 struct i2c_client *client = to_i2c_client(dev);
627 struct lp5523_chip *chip = i2c_get_clientdata(client);
628 struct lp5523_engine *engine = &chip->engines[nr - 1];
629 mutex_lock(&chip->lock);
631 if (!strncmp(buf, "run", 3))
632 lp5523_set_mode(engine, LP5523_CMD_RUN);
633 else if (!strncmp(buf, "load", 4))
634 lp5523_set_mode(engine, LP5523_CMD_LOAD);
635 else if (!strncmp(buf, "disabled", 8))
636 lp5523_set_mode(engine, LP5523_CMD_DISABLED);
638 mutex_unlock(&chip->lock);
642 #define store_mode(nr) \
643 static ssize_t store_engine##nr##_mode(struct device *dev, \
644 struct device_attribute *attr, \
645 const char *buf, size_t len) \
647 return store_engine_mode(dev, attr, buf, len, nr); \
653 static ssize_t show_max_current(struct device *dev,
654 struct device_attribute *attr,
657 struct led_classdev *led_cdev = dev_get_drvdata(dev);
658 struct lp5523_led *led = cdev_to_led(led_cdev);
660 return sprintf(buf, "%d\n", led->max_current);
663 static ssize_t show_current(struct device *dev,
664 struct device_attribute *attr,
667 struct led_classdev *led_cdev = dev_get_drvdata(dev);
668 struct lp5523_led *led = cdev_to_led(led_cdev);
670 return sprintf(buf, "%d\n", led->led_current);
673 static ssize_t store_current(struct device *dev,
674 struct device_attribute *attr,
675 const char *buf, size_t len)
677 struct led_classdev *led_cdev = dev_get_drvdata(dev);
678 struct lp5523_led *led = cdev_to_led(led_cdev);
679 struct lp5523_chip *chip = led_to_lp5523(led);
683 if (strict_strtoul(buf, 0, &curr))
686 if (curr > led->max_current)
689 mutex_lock(&chip->lock);
690 ret = lp5523_write(chip->client,
691 LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
693 mutex_unlock(&chip->lock);
698 led->led_current = (u8)curr;
703 /* led class device attributes */
704 static DEVICE_ATTR(led_current, S_IRUGO | S_IWUGO, show_current, store_current);
705 static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
707 static struct attribute *lp5523_led_attributes[] = {
708 &dev_attr_led_current.attr,
709 &dev_attr_max_current.attr,
713 static struct attribute_group lp5523_led_attribute_group = {
714 .attrs = lp5523_led_attributes
717 /* device attributes */
718 static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUGO,
719 show_engine1_mode, store_engine1_mode);
720 static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUGO,
721 show_engine2_mode, store_engine2_mode);
722 static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUGO,
723 show_engine3_mode, store_engine3_mode);
724 static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUGO,
725 show_engine1_leds, store_engine1_leds);
726 static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUGO,
727 show_engine2_leds, store_engine2_leds);
728 static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUGO,
729 show_engine3_leds, store_engine3_leds);
730 static DEVICE_ATTR(engine1_load, S_IWUGO, NULL, store_engine1_load);
731 static DEVICE_ATTR(engine2_load, S_IWUGO, NULL, store_engine2_load);
732 static DEVICE_ATTR(engine3_load, S_IWUGO, NULL, store_engine3_load);
733 static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL);
735 static struct attribute *lp5523_attributes[] = {
736 &dev_attr_engine1_mode.attr,
737 &dev_attr_engine2_mode.attr,
738 &dev_attr_engine3_mode.attr,
739 &dev_attr_selftest.attr,
743 static struct attribute *lp5523_engine1_attributes[] = {
744 &dev_attr_engine1_load.attr,
745 &dev_attr_engine1_leds.attr,
749 static struct attribute *lp5523_engine2_attributes[] = {
750 &dev_attr_engine2_load.attr,
751 &dev_attr_engine2_leds.attr,
755 static struct attribute *lp5523_engine3_attributes[] = {
756 &dev_attr_engine3_load.attr,
757 &dev_attr_engine3_leds.attr,
761 static const struct attribute_group lp5523_group = {
762 .attrs = lp5523_attributes,
765 static const struct attribute_group lp5523_engine_group[] = {
766 {.attrs = lp5523_engine1_attributes },
767 {.attrs = lp5523_engine2_attributes },
768 {.attrs = lp5523_engine3_attributes },
771 static int lp5523_register_sysfs(struct i2c_client *client)
773 struct device *dev = &client->dev;
776 ret = sysfs_create_group(&dev->kobj, &lp5523_group);
783 static void lp5523_unregister_sysfs(struct i2c_client *client)
785 struct lp5523_chip *chip = i2c_get_clientdata(client);
786 struct device *dev = &client->dev;
789 sysfs_remove_group(&dev->kobj, &lp5523_group);
791 for (i = 0; i < ARRAY_SIZE(chip->engines); i++)
792 if (chip->engines[i].mode == LP5523_CMD_LOAD)
793 sysfs_remove_group(&dev->kobj, &lp5523_engine_group[i]);
795 for (i = 0; i < chip->num_leds; i++)
796 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
797 &lp5523_led_attribute_group);
800 /*--------------------------------------------------------------*/
801 /* Set chip operating mode */
802 /*--------------------------------------------------------------*/
803 static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode)
806 struct lp5523_chip *chip = engine_to_lp5523(engine);
807 struct i2c_client *client = chip->client;
808 struct device *dev = &client->dev;
811 /* if in that mode already do nothing, except for run */
812 if (mode == engine->mode && mode != LP5523_CMD_RUN)
815 if (mode == LP5523_CMD_RUN) {
816 ret = lp5523_run_program(engine);
817 } else if (mode == LP5523_CMD_LOAD) {
818 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
819 lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
821 ret = sysfs_create_group(&dev->kobj, engine->attributes);
824 } else if (mode == LP5523_CMD_DISABLED) {
825 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
828 /* remove load attribute from sysfs if not in load mode */
829 if (engine->mode == LP5523_CMD_LOAD && mode != LP5523_CMD_LOAD)
830 sysfs_remove_group(&dev->kobj, engine->attributes);
837 /*--------------------------------------------------------------*/
838 /* Probe, Attach, Remove */
839 /*--------------------------------------------------------------*/
840 static int __init lp5523_init_engine(struct lp5523_engine *engine, int id)
842 if (id < 1 || id > LP5523_ENGINES)
845 engine->engine_mask = LP5523_ENG_MASK_BASE >> SHIFT_MASK(id);
846 engine->prog_page = id - 1;
847 engine->mux_page = id + 2;
848 engine->attributes = &lp5523_engine_group[id - 1];
853 static int __init lp5523_init_led(struct lp5523_led *led, struct device *dev,
854 int chan, struct lp5523_platform_data *pdata)
859 if (chan >= LP5523_LEDS)
862 if (pdata->led_config[chan].led_current) {
863 led->led_current = pdata->led_config[chan].led_current;
864 led->max_current = pdata->led_config[chan].max_current;
865 led->chan_nr = pdata->led_config[chan].chan_nr;
867 if (led->chan_nr >= LP5523_LEDS) {
868 dev_err(dev, "Use channel numbers between 0 and %d\n",
873 snprintf(name, 32, "lp5523:channel%d", chan);
875 led->cdev.name = name;
876 led->cdev.brightness_set = lp5523_set_brightness;
877 res = led_classdev_register(dev, &led->cdev);
879 dev_err(dev, "couldn't register led on channel %d\n",
883 res = sysfs_create_group(&led->cdev.dev->kobj,
884 &lp5523_led_attribute_group);
886 dev_err(dev, "couldn't register current attribute\n");
887 led_classdev_unregister(&led->cdev);
891 led->led_current = 0;
896 static struct i2c_driver lp5523_driver;
898 static int lp5523_probe(struct i2c_client *client,
899 const struct i2c_device_id *id)
901 struct lp5523_chip *chip;
902 struct lp5523_platform_data *pdata;
905 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
909 i2c_set_clientdata(client, chip);
910 chip->client = client;
912 pdata = client->dev.platform_data;
915 dev_err(&client->dev, "no platform data\n");
920 mutex_init(&chip->lock);
924 if (pdata->setup_resources) {
925 ret = pdata->setup_resources();
932 usleep_range(1000, 2000); /* Keep enable down at least 1ms */
934 usleep_range(1000, 2000); /* 500us abs min. */
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.
942 ret = lp5523_detect(client);
946 dev_info(&client->dev, "LP5523 Programmable led chip found\n");
948 /* Initialize engines */
949 for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
950 ret = lp5523_init_engine(&chip->engines[i], i + 1);
952 dev_err(&client->dev, "error initializing engine\n");
956 ret = lp5523_configure(client);
958 dev_err(&client->dev, "error configuring chip\n");
962 /* Initialize leds */
963 chip->num_channels = pdata->num_channels;
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)
971 ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata);
973 dev_err(&client->dev, "error initializing leds\n");
978 chip->leds[led].id = led;
979 /* Set LED current */
981 LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
982 chip->leds[led].led_current);
984 INIT_WORK(&(chip->leds[led].brightness_work),
985 lp5523_led_brightness_work);
990 ret = lp5523_register_sysfs(client);
992 dev_err(&client->dev, "registering sysfs failed\n");
997 for (i = 0; i < chip->num_leds; i++) {
998 led_classdev_unregister(&chip->leds[i].cdev);
999 cancel_work_sync(&chip->leds[i].brightness_work);
1004 if (pdata->release_resources)
1005 pdata->release_resources();
1011 static int lp5523_remove(struct i2c_client *client)
1013 struct lp5523_chip *chip = i2c_get_clientdata(client);
1016 lp5523_unregister_sysfs(client);
1018 for (i = 0; i < chip->num_leds; i++) {
1019 led_classdev_unregister(&chip->leds[i].cdev);
1020 cancel_work_sync(&chip->leds[i].brightness_work);
1023 if (chip->pdata->enable)
1024 chip->pdata->enable(0);
1025 if (chip->pdata->release_resources)
1026 chip->pdata->release_resources();
1031 static const struct i2c_device_id lp5523_id[] = {
1036 MODULE_DEVICE_TABLE(i2c, lp5523_id);
1038 static struct i2c_driver lp5523_driver = {
1042 .probe = lp5523_probe,
1043 .remove = lp5523_remove,
1044 .id_table = lp5523_id,
1047 static int __init lp5523_init(void)
1051 ret = i2c_add_driver(&lp5523_driver);
1054 printk(KERN_ALERT "Adding lp5523 driver failed\n");
1059 static void __exit lp5523_exit(void)
1061 i2c_del_driver(&lp5523_driver);
1064 module_init(lp5523_init);
1065 module_exit(lp5523_exit);
1067 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
1068 MODULE_DESCRIPTION("LP5523 LED engine");
1069 MODULE_LICENSE("GPL");