2 * LP5521 LED chip 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-lp5521.h>
35 #include <linux/workqueue.h>
36 #include <linux/slab.h>
38 #define LP5521_PROGRAM_LENGTH 32 /* in bytes */
40 #define LP5521_MAX_LEDS 3 /* Maximum number of LEDs */
41 #define LP5521_MAX_ENGINES 3 /* Maximum number of engines */
43 #define LP5521_ENG_MASK_BASE 0x30 /* 00110000 */
44 #define LP5521_ENG_STATUS_MASK 0x07 /* 00000111 */
46 #define LP5521_CMD_LOAD 0x15 /* 00010101 */
47 #define LP5521_CMD_RUN 0x2a /* 00101010 */
48 #define LP5521_CMD_DIRECT 0x3f /* 00111111 */
49 #define LP5521_CMD_DISABLED 0x00 /* 00000000 */
52 #define LP5521_REG_ENABLE 0x00
53 #define LP5521_REG_OP_MODE 0x01
54 #define LP5521_REG_R_PWM 0x02
55 #define LP5521_REG_G_PWM 0x03
56 #define LP5521_REG_B_PWM 0x04
57 #define LP5521_REG_R_CURRENT 0x05
58 #define LP5521_REG_G_CURRENT 0x06
59 #define LP5521_REG_B_CURRENT 0x07
60 #define LP5521_REG_CONFIG 0x08
61 #define LP5521_REG_R_CHANNEL_PC 0x09
62 #define LP5521_REG_G_CHANNEL_PC 0x0A
63 #define LP5521_REG_B_CHANNEL_PC 0x0B
64 #define LP5521_REG_STATUS 0x0C
65 #define LP5521_REG_RESET 0x0D
66 #define LP5521_REG_GPO 0x0E
67 #define LP5521_REG_R_PROG_MEM 0x10
68 #define LP5521_REG_G_PROG_MEM 0x30
69 #define LP5521_REG_B_PROG_MEM 0x50
71 #define LP5521_PROG_MEM_BASE LP5521_REG_R_PROG_MEM
72 #define LP5521_PROG_MEM_SIZE 0x20
74 /* Base register to set LED current */
75 #define LP5521_REG_LED_CURRENT_BASE LP5521_REG_R_CURRENT
77 /* Base register to set the brightness */
78 #define LP5521_REG_LED_PWM_BASE LP5521_REG_R_PWM
80 /* Bits in ENABLE register */
81 #define LP5521_MASTER_ENABLE 0x40 /* Chip master enable */
82 #define LP5521_LOGARITHMIC_PWM 0x80 /* Logarithmic PWM adjustment */
83 #define LP5521_EXEC_RUN 0x2A
85 /* Bits in CONFIG register */
86 #define LP5521_PWM_HF 0x40 /* PWM: 0 = 256Hz, 1 = 558Hz */
87 #define LP5521_PWRSAVE_EN 0x20 /* 1 = Power save mode */
88 #define LP5521_CP_MODE_OFF 0 /* Charge pump (CP) off */
89 #define LP5521_CP_MODE_BYPASS 8 /* CP forced to bypass mode */
90 #define LP5521_CP_MODE_1X5 0x10 /* CP forced to 1.5x mode */
91 #define LP5521_CP_MODE_AUTO 0x18 /* Automatic mode selection */
92 #define LP5521_R_TO_BATT 4 /* R out: 0 = CP, 1 = Vbat */
93 #define LP5521_CLK_SRC_EXT 0 /* Ext-clk source (CLK_32K) */
94 #define LP5521_CLK_INT 1 /* Internal clock */
95 #define LP5521_CLK_AUTO 2 /* Automatic clock selection */
98 #define LP5521_EXT_CLK_USED 0x08
100 /* default R channel current register value */
101 #define LP5521_REG_R_CURR_DEFAULT 0xAF
103 struct lp5521_engine {
115 struct led_classdev cdev;
116 struct work_struct brightness_work;
121 struct lp5521_platform_data *pdata;
122 struct mutex lock; /* Serialize control */
123 struct i2c_client *client;
124 struct lp5521_engine engines[LP5521_MAX_ENGINES];
125 struct lp5521_led leds[LP5521_MAX_LEDS];
130 static inline struct lp5521_led *cdev_to_led(struct led_classdev *cdev)
132 return container_of(cdev, struct lp5521_led, cdev);
135 static inline struct lp5521_chip *engine_to_lp5521(struct lp5521_engine *engine)
137 return container_of(engine, struct lp5521_chip,
138 engines[engine->id - 1]);
141 static inline struct lp5521_chip *led_to_lp5521(struct lp5521_led *led)
143 return container_of(led, struct lp5521_chip,
147 static void lp5521_led_brightness_work(struct work_struct *work);
149 static inline int lp5521_write(struct i2c_client *client, u8 reg, u8 value)
151 return i2c_smbus_write_byte_data(client, reg, value);
154 static int lp5521_read(struct i2c_client *client, u8 reg, u8 *buf)
158 ret = i2c_smbus_read_byte_data(client, reg);
166 static int lp5521_set_engine_mode(struct lp5521_engine *engine, u8 mode)
168 struct lp5521_chip *chip = engine_to_lp5521(engine);
169 struct i2c_client *client = chip->client;
173 /* Only transition between RUN and DIRECT mode are handled here */
174 if (mode == LP5521_CMD_LOAD)
177 if (mode == LP5521_CMD_DISABLED)
178 mode = LP5521_CMD_DIRECT;
180 ret = lp5521_read(client, LP5521_REG_OP_MODE, &engine_state);
184 /* set mode only for this engine */
185 engine_state &= ~(engine->engine_mask);
186 mode &= engine->engine_mask;
187 engine_state |= mode;
188 return lp5521_write(client, LP5521_REG_OP_MODE, engine_state);
191 static int lp5521_load_program(struct lp5521_engine *eng, const u8 *pattern)
193 struct lp5521_chip *chip = engine_to_lp5521(eng);
194 struct i2c_client *client = chip->client;
199 /* move current engine to direct mode and remember the state */
200 ret = lp5521_set_engine_mode(eng, LP5521_CMD_DIRECT);
204 /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
205 usleep_range(1000, 2000);
206 ret = lp5521_read(client, LP5521_REG_OP_MODE, &mode);
210 /* For loading, all the engines to load mode */
211 lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
212 /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
213 usleep_range(1000, 2000);
214 lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_LOAD);
215 /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
216 usleep_range(1000, 2000);
218 addr = LP5521_PROG_MEM_BASE + eng->prog_page * LP5521_PROG_MEM_SIZE;
219 i2c_smbus_write_i2c_block_data(client,
221 LP5521_PROG_MEM_SIZE,
224 return lp5521_write(client, LP5521_REG_OP_MODE, mode);
227 static int lp5521_set_led_current(struct lp5521_chip *chip, int led, u8 curr)
229 return lp5521_write(chip->client,
230 LP5521_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
234 static void lp5521_init_engine(struct lp5521_chip *chip)
237 for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
238 chip->engines[i].id = i + 1;
239 chip->engines[i].engine_mask = LP5521_ENG_MASK_BASE >> (i * 2);
240 chip->engines[i].prog_page = i;
244 static int lp5521_configure(struct i2c_client *client)
246 struct lp5521_chip *chip = i2c_get_clientdata(client);
249 lp5521_init_engine(chip);
251 /* Set all PWMs to direct control mode */
252 ret = lp5521_write(client, LP5521_REG_OP_MODE, 0x3F);
254 /* Enable auto-powersave, set charge pump to auto, red to battery */
255 ret |= lp5521_write(client, LP5521_REG_CONFIG,
256 LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO | LP5521_R_TO_BATT);
258 /* Initialize all channels PWM to zero -> leds off */
259 ret |= lp5521_write(client, LP5521_REG_R_PWM, 0);
260 ret |= lp5521_write(client, LP5521_REG_G_PWM, 0);
261 ret |= lp5521_write(client, LP5521_REG_B_PWM, 0);
263 /* Set engines are set to run state when OP_MODE enables engines */
264 ret |= lp5521_write(client, LP5521_REG_ENABLE,
265 LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM |
267 /* enable takes 500us. 1 - 2 ms leaves some margin */
268 usleep_range(1000, 2000);
273 static int lp5521_run_selftest(struct lp5521_chip *chip, char *buf)
278 ret = lp5521_read(chip->client, LP5521_REG_STATUS, &status);
282 /* Check that ext clock is really in use if requested */
283 if (chip->pdata && chip->pdata->clock_mode == LP5521_CLOCK_EXT)
284 if ((status & LP5521_EXT_CLK_USED) == 0)
289 static void lp5521_set_brightness(struct led_classdev *cdev,
290 enum led_brightness brightness)
292 struct lp5521_led *led = cdev_to_led(cdev);
293 led->brightness = (u8)brightness;
294 schedule_work(&led->brightness_work);
297 static void lp5521_led_brightness_work(struct work_struct *work)
299 struct lp5521_led *led = container_of(work,
302 struct lp5521_chip *chip = led_to_lp5521(led);
303 struct i2c_client *client = chip->client;
305 mutex_lock(&chip->lock);
306 lp5521_write(client, LP5521_REG_LED_PWM_BASE + led->chan_nr,
308 mutex_unlock(&chip->lock);
311 /* Detect the chip by setting its ENABLE register and reading it back. */
312 static int lp5521_detect(struct i2c_client *client)
317 ret = lp5521_write(client, LP5521_REG_ENABLE,
318 LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM);
321 /* enable takes 500us. 1 - 2 ms leaves some margin */
322 usleep_range(1000, 2000);
323 ret = lp5521_read(client, LP5521_REG_ENABLE, &buf);
326 if (buf != (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM))
332 /* Set engine mode and create appropriate sysfs attributes, if required. */
333 static int lp5521_set_mode(struct lp5521_engine *engine, u8 mode)
337 /* if in that mode already do nothing, except for run */
338 if (mode == engine->mode && mode != LP5521_CMD_RUN)
341 if (mode == LP5521_CMD_RUN) {
342 ret = lp5521_set_engine_mode(engine, LP5521_CMD_RUN);
343 } else if (mode == LP5521_CMD_LOAD) {
344 lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED);
345 lp5521_set_engine_mode(engine, LP5521_CMD_LOAD);
346 } else if (mode == LP5521_CMD_DISABLED) {
347 lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED);
355 static int lp5521_do_store_load(struct lp5521_engine *engine,
356 const char *buf, size_t len)
358 struct lp5521_chip *chip = engine_to_lp5521(engine);
359 struct i2c_client *client = chip->client;
360 int ret, nrchars, offset = 0, i = 0;
363 u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
365 while ((offset < len - 1) && (i < LP5521_PROGRAM_LENGTH)) {
366 /* separate sscanfs because length is working only for %s */
367 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
370 ret = sscanf(c, "%2x", &cmd);
373 pattern[i] = (u8)cmd;
379 /* Each instruction is 16bit long. Check that length is even */
383 mutex_lock(&chip->lock);
384 if (engine->mode == LP5521_CMD_LOAD)
385 ret = lp5521_load_program(engine, pattern);
388 mutex_unlock(&chip->lock);
391 dev_err(&client->dev, "failed loading pattern\n");
397 dev_err(&client->dev, "wrong pattern format\n");
401 static ssize_t store_engine_load(struct device *dev,
402 struct device_attribute *attr,
403 const char *buf, size_t len, int nr)
405 struct i2c_client *client = to_i2c_client(dev);
406 struct lp5521_chip *chip = i2c_get_clientdata(client);
407 return lp5521_do_store_load(&chip->engines[nr - 1], buf, len);
410 #define store_load(nr) \
411 static ssize_t store_engine##nr##_load(struct device *dev, \
412 struct device_attribute *attr, \
413 const char *buf, size_t len) \
415 return store_engine_load(dev, attr, buf, len, nr); \
421 static ssize_t show_engine_mode(struct device *dev,
422 struct device_attribute *attr,
425 struct i2c_client *client = to_i2c_client(dev);
426 struct lp5521_chip *chip = i2c_get_clientdata(client);
427 switch (chip->engines[nr - 1].mode) {
429 return sprintf(buf, "run\n");
430 case LP5521_CMD_LOAD:
431 return sprintf(buf, "load\n");
432 case LP5521_CMD_DISABLED:
433 return sprintf(buf, "disabled\n");
435 return sprintf(buf, "disabled\n");
439 #define show_mode(nr) \
440 static ssize_t show_engine##nr##_mode(struct device *dev, \
441 struct device_attribute *attr, \
444 return show_engine_mode(dev, attr, buf, nr); \
450 static ssize_t store_engine_mode(struct device *dev,
451 struct device_attribute *attr,
452 const char *buf, size_t len, int nr)
454 struct i2c_client *client = to_i2c_client(dev);
455 struct lp5521_chip *chip = i2c_get_clientdata(client);
456 struct lp5521_engine *engine = &chip->engines[nr - 1];
457 mutex_lock(&chip->lock);
459 if (!strncmp(buf, "run", 3))
460 lp5521_set_mode(engine, LP5521_CMD_RUN);
461 else if (!strncmp(buf, "load", 4))
462 lp5521_set_mode(engine, LP5521_CMD_LOAD);
463 else if (!strncmp(buf, "disabled", 8))
464 lp5521_set_mode(engine, LP5521_CMD_DISABLED);
466 mutex_unlock(&chip->lock);
470 #define store_mode(nr) \
471 static ssize_t store_engine##nr##_mode(struct device *dev, \
472 struct device_attribute *attr, \
473 const char *buf, size_t len) \
475 return store_engine_mode(dev, attr, buf, len, nr); \
481 static ssize_t show_max_current(struct device *dev,
482 struct device_attribute *attr,
485 struct led_classdev *led_cdev = dev_get_drvdata(dev);
486 struct lp5521_led *led = cdev_to_led(led_cdev);
488 return sprintf(buf, "%d\n", led->max_current);
491 static ssize_t show_current(struct device *dev,
492 struct device_attribute *attr,
495 struct led_classdev *led_cdev = dev_get_drvdata(dev);
496 struct lp5521_led *led = cdev_to_led(led_cdev);
498 return sprintf(buf, "%d\n", led->led_current);
501 static ssize_t store_current(struct device *dev,
502 struct device_attribute *attr,
503 const char *buf, size_t len)
505 struct led_classdev *led_cdev = dev_get_drvdata(dev);
506 struct lp5521_led *led = cdev_to_led(led_cdev);
507 struct lp5521_chip *chip = led_to_lp5521(led);
511 if (strict_strtoul(buf, 0, &curr))
514 if (curr > led->max_current)
517 mutex_lock(&chip->lock);
518 ret = lp5521_set_led_current(chip, led->id, curr);
519 mutex_unlock(&chip->lock);
524 led->led_current = (u8)curr;
529 static ssize_t lp5521_selftest(struct device *dev,
530 struct device_attribute *attr,
533 struct i2c_client *client = to_i2c_client(dev);
534 struct lp5521_chip *chip = i2c_get_clientdata(client);
537 mutex_lock(&chip->lock);
538 ret = lp5521_run_selftest(chip, buf);
539 mutex_unlock(&chip->lock);
540 return sprintf(buf, "%s\n", ret ? "FAIL" : "OK");
543 /* led class device attributes */
544 static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current);
545 static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
547 static struct attribute *lp5521_led_attributes[] = {
548 &dev_attr_led_current.attr,
549 &dev_attr_max_current.attr,
553 static struct attribute_group lp5521_led_attribute_group = {
554 .attrs = lp5521_led_attributes
557 /* device attributes */
558 static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR,
559 show_engine1_mode, store_engine1_mode);
560 static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR,
561 show_engine2_mode, store_engine2_mode);
562 static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR,
563 show_engine3_mode, store_engine3_mode);
564 static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load);
565 static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load);
566 static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load);
567 static DEVICE_ATTR(selftest, S_IRUGO, lp5521_selftest, NULL);
569 static struct attribute *lp5521_attributes[] = {
570 &dev_attr_engine1_mode.attr,
571 &dev_attr_engine2_mode.attr,
572 &dev_attr_engine3_mode.attr,
573 &dev_attr_selftest.attr,
574 &dev_attr_engine1_load.attr,
575 &dev_attr_engine2_load.attr,
576 &dev_attr_engine3_load.attr,
580 static const struct attribute_group lp5521_group = {
581 .attrs = lp5521_attributes,
584 static int lp5521_register_sysfs(struct i2c_client *client)
586 struct device *dev = &client->dev;
587 return sysfs_create_group(&dev->kobj, &lp5521_group);
590 static void lp5521_unregister_sysfs(struct i2c_client *client)
592 struct lp5521_chip *chip = i2c_get_clientdata(client);
593 struct device *dev = &client->dev;
596 sysfs_remove_group(&dev->kobj, &lp5521_group);
598 for (i = 0; i < chip->num_leds; i++)
599 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
600 &lp5521_led_attribute_group);
603 static int __devinit lp5521_init_led(struct lp5521_led *led,
604 struct i2c_client *client,
605 int chan, struct lp5521_platform_data *pdata)
607 struct device *dev = &client->dev;
611 if (chan >= LP5521_MAX_LEDS)
614 if (pdata->led_config[chan].led_current == 0)
617 led->led_current = pdata->led_config[chan].led_current;
618 led->max_current = pdata->led_config[chan].max_current;
619 led->chan_nr = pdata->led_config[chan].chan_nr;
621 if (led->chan_nr >= LP5521_MAX_LEDS) {
622 dev_err(dev, "Use channel numbers between 0 and %d\n",
623 LP5521_MAX_LEDS - 1);
627 snprintf(name, sizeof(name), "%s:channel%d",
628 pdata->label ?: client->name, chan);
629 led->cdev.brightness_set = lp5521_set_brightness;
630 led->cdev.name = name;
631 res = led_classdev_register(dev, &led->cdev);
633 dev_err(dev, "couldn't register led on channel %d\n", chan);
637 res = sysfs_create_group(&led->cdev.dev->kobj,
638 &lp5521_led_attribute_group);
640 dev_err(dev, "couldn't register current attribute\n");
641 led_classdev_unregister(&led->cdev);
647 static int __devinit lp5521_probe(struct i2c_client *client,
648 const struct i2c_device_id *id)
650 struct lp5521_chip *chip;
651 struct lp5521_platform_data *pdata;
655 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
659 i2c_set_clientdata(client, chip);
660 chip->client = client;
662 pdata = client->dev.platform_data;
665 dev_err(&client->dev, "no platform data\n");
670 mutex_init(&chip->lock);
674 if (pdata->setup_resources) {
675 ret = pdata->setup_resources();
682 usleep_range(1000, 2000); /* Keep enable down at least 1ms */
684 usleep_range(1000, 2000); /* 500us abs min. */
687 lp5521_write(client, LP5521_REG_RESET, 0xff);
688 usleep_range(10000, 20000); /*
689 * Exact value is not available. 10 - 20ms
690 * appears to be enough for reset.
694 * Make sure that the chip is reset by reading back the r channel
695 * current reg. This is dummy read is required on some platforms -
696 * otherwise further access to the R G B channels in the
697 * LP5521_REG_ENABLE register will not have any effect - strange!
699 ret = lp5521_read(client, LP5521_REG_R_CURRENT, &buf);
700 if (ret || buf != LP5521_REG_R_CURR_DEFAULT) {
701 dev_err(&client->dev, "error in resetting chip\n");
704 usleep_range(10000, 20000);
706 ret = lp5521_detect(client);
709 dev_err(&client->dev, "Chip not found\n");
713 dev_info(&client->dev, "%s programmable led chip found\n", id->name);
715 ret = lp5521_configure(client);
717 dev_err(&client->dev, "error configuring chip\n");
721 /* Initialize leds */
722 chip->num_channels = pdata->num_channels;
725 for (i = 0; i < pdata->num_channels; i++) {
726 /* Do not initialize channels that are not connected */
727 if (pdata->led_config[i].led_current == 0)
730 ret = lp5521_init_led(&chip->leds[led], client, i, pdata);
732 dev_err(&client->dev, "error initializing leds\n");
737 chip->leds[led].id = led;
738 /* Set initial LED current */
739 lp5521_set_led_current(chip, led,
740 chip->leds[led].led_current);
742 INIT_WORK(&(chip->leds[led].brightness_work),
743 lp5521_led_brightness_work);
748 ret = lp5521_register_sysfs(client);
750 dev_err(&client->dev, "registering sysfs failed\n");
755 for (i = 0; i < chip->num_leds; i++) {
756 led_classdev_unregister(&chip->leds[i].cdev);
757 cancel_work_sync(&chip->leds[i].brightness_work);
762 if (pdata->release_resources)
763 pdata->release_resources();
769 static int __devexit lp5521_remove(struct i2c_client *client)
771 struct lp5521_chip *chip = i2c_get_clientdata(client);
774 lp5521_unregister_sysfs(client);
776 for (i = 0; i < chip->num_leds; i++) {
777 led_classdev_unregister(&chip->leds[i].cdev);
778 cancel_work_sync(&chip->leds[i].brightness_work);
781 if (chip->pdata->enable)
782 chip->pdata->enable(0);
783 if (chip->pdata->release_resources)
784 chip->pdata->release_resources();
789 static const struct i2c_device_id lp5521_id[] = {
790 { "lp5521", 0 }, /* Three channel chip */
793 MODULE_DEVICE_TABLE(i2c, lp5521_id);
795 static struct i2c_driver lp5521_driver = {
799 .probe = lp5521_probe,
800 .remove = __devexit_p(lp5521_remove),
801 .id_table = lp5521_id,
804 static int __init lp5521_init(void)
808 ret = i2c_add_driver(&lp5521_driver);
811 printk(KERN_ALERT "Adding lp5521 driver failed\n");
816 static void __exit lp5521_exit(void)
818 i2c_del_driver(&lp5521_driver);
821 module_init(lp5521_init);
822 module_exit(lp5521_exit);
824 MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
825 MODULE_DESCRIPTION("LP5521 LED engine");
826 MODULE_LICENSE("GPL v2");