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 struct lp5521_engine {
101 const struct attribute_group *attributes;
113 struct led_classdev cdev;
114 struct work_struct brightness_work;
119 struct lp5521_platform_data *pdata;
120 struct mutex lock; /* Serialize control */
121 struct i2c_client *client;
122 struct lp5521_engine engines[LP5521_MAX_ENGINES];
123 struct lp5521_led leds[LP5521_MAX_LEDS];
128 static inline struct lp5521_led *cdev_to_led(struct led_classdev *cdev)
130 return container_of(cdev, struct lp5521_led, cdev);
133 static inline struct lp5521_chip *engine_to_lp5521(struct lp5521_engine *engine)
135 return container_of(engine, struct lp5521_chip,
136 engines[engine->id - 1]);
139 static inline struct lp5521_chip *led_to_lp5521(struct lp5521_led *led)
141 return container_of(led, struct lp5521_chip,
145 static void lp5521_led_brightness_work(struct work_struct *work);
147 static inline int lp5521_write(struct i2c_client *client, u8 reg, u8 value)
149 return i2c_smbus_write_byte_data(client, reg, value);
152 static int lp5521_read(struct i2c_client *client, u8 reg, u8 *buf)
156 ret = i2c_smbus_read_byte_data(client, reg);
164 static int lp5521_set_engine_mode(struct lp5521_engine *engine, u8 mode)
166 struct lp5521_chip *chip = engine_to_lp5521(engine);
167 struct i2c_client *client = chip->client;
171 /* Only transition between RUN and DIRECT mode are handled here */
172 if (mode == LP5521_CMD_LOAD)
175 if (mode == LP5521_CMD_DISABLED)
176 mode = LP5521_CMD_DIRECT;
178 ret = lp5521_read(client, LP5521_REG_OP_MODE, &engine_state);
180 /* set mode only for this engine */
181 engine_state &= ~(engine->engine_mask);
182 mode &= engine->engine_mask;
183 engine_state |= mode;
184 ret |= lp5521_write(client, LP5521_REG_OP_MODE, engine_state);
189 static int lp5521_load_program(struct lp5521_engine *eng, const u8 *pattern)
191 struct lp5521_chip *chip = engine_to_lp5521(eng);
192 struct i2c_client *client = chip->client;
197 /* move current engine to direct mode and remember the state */
198 ret = lp5521_set_engine_mode(eng, LP5521_CMD_DIRECT);
199 /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
200 usleep_range(1000, 2000);
201 ret |= lp5521_read(client, LP5521_REG_OP_MODE, &mode);
203 /* For loading, all the engines to load mode */
204 lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
205 /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
206 usleep_range(1000, 2000);
207 lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_LOAD);
208 /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
209 usleep_range(1000, 2000);
211 addr = LP5521_PROG_MEM_BASE + eng->prog_page * LP5521_PROG_MEM_SIZE;
212 i2c_smbus_write_i2c_block_data(client,
214 LP5521_PROG_MEM_SIZE,
217 ret |= lp5521_write(client, LP5521_REG_OP_MODE, mode);
221 static int lp5521_set_led_current(struct lp5521_chip *chip, int led, u8 curr)
223 return lp5521_write(chip->client,
224 LP5521_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
228 static void lp5521_init_engine(struct lp5521_chip *chip,
229 const struct attribute_group *attr_group)
232 for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
233 chip->engines[i].id = i + 1;
234 chip->engines[i].engine_mask = LP5521_ENG_MASK_BASE >> (i * 2);
235 chip->engines[i].prog_page = i;
236 chip->engines[i].attributes = &attr_group[i];
240 static int lp5521_configure(struct i2c_client *client,
241 const struct attribute_group *attr_group)
243 struct lp5521_chip *chip = i2c_get_clientdata(client);
246 lp5521_init_engine(chip, attr_group);
248 lp5521_write(client, LP5521_REG_RESET, 0xff);
250 usleep_range(10000, 20000); /*
251 * Exact value is not available. 10 - 20ms
252 * appears to be enough for reset.
255 /* Set all PWMs to direct control mode */
256 ret = lp5521_write(client, LP5521_REG_OP_MODE, 0x3F);
258 /* Enable auto-powersave, set charge pump to auto, red to battery */
259 ret |= lp5521_write(client, LP5521_REG_CONFIG,
260 LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO | LP5521_R_TO_BATT);
262 /* Initialize all channels PWM to zero -> leds off */
263 ret |= lp5521_write(client, LP5521_REG_R_PWM, 0);
264 ret |= lp5521_write(client, LP5521_REG_G_PWM, 0);
265 ret |= lp5521_write(client, LP5521_REG_B_PWM, 0);
267 /* Set engines are set to run state when OP_MODE enables engines */
268 ret |= lp5521_write(client, LP5521_REG_ENABLE,
269 LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM |
271 /* enable takes 500us. 1 - 2 ms leaves some margin */
272 usleep_range(1000, 2000);
277 static int lp5521_run_selftest(struct lp5521_chip *chip, char *buf)
282 ret = lp5521_read(chip->client, LP5521_REG_STATUS, &status);
286 /* Check that ext clock is really in use if requested */
287 if (chip->pdata && chip->pdata->clock_mode == LP5521_CLOCK_EXT)
288 if ((status & LP5521_EXT_CLK_USED) == 0)
293 static void lp5521_set_brightness(struct led_classdev *cdev,
294 enum led_brightness brightness)
296 struct lp5521_led *led = cdev_to_led(cdev);
297 led->brightness = (u8)brightness;
298 schedule_work(&led->brightness_work);
301 static void lp5521_led_brightness_work(struct work_struct *work)
303 struct lp5521_led *led = container_of(work,
306 struct lp5521_chip *chip = led_to_lp5521(led);
307 struct i2c_client *client = chip->client;
309 mutex_lock(&chip->lock);
310 lp5521_write(client, LP5521_REG_LED_PWM_BASE + led->chan_nr,
312 mutex_unlock(&chip->lock);
315 /* Detect the chip by setting its ENABLE register and reading it back. */
316 static int lp5521_detect(struct i2c_client *client)
321 ret = lp5521_write(client, LP5521_REG_ENABLE,
322 LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM);
325 /* enable takes 500us. 1 - 2 ms leaves some margin */
326 usleep_range(1000, 2000);
327 ret = lp5521_read(client, LP5521_REG_ENABLE, &buf);
330 if (buf != (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM))
336 /* Set engine mode and create appropriate sysfs attributes, if required. */
337 static int lp5521_set_mode(struct lp5521_engine *engine, u8 mode)
339 struct lp5521_chip *chip = engine_to_lp5521(engine);
340 struct i2c_client *client = chip->client;
341 struct device *dev = &client->dev;
344 /* if in that mode already do nothing, except for run */
345 if (mode == engine->mode && mode != LP5521_CMD_RUN)
348 if (mode == LP5521_CMD_RUN) {
349 ret = lp5521_set_engine_mode(engine, LP5521_CMD_RUN);
350 } else if (mode == LP5521_CMD_LOAD) {
351 lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED);
352 lp5521_set_engine_mode(engine, LP5521_CMD_LOAD);
354 ret = sysfs_create_group(&dev->kobj, engine->attributes);
357 } else if (mode == LP5521_CMD_DISABLED) {
358 lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED);
361 /* remove load attribute from sysfs if not in load mode */
362 if (engine->mode == LP5521_CMD_LOAD && mode != LP5521_CMD_LOAD)
363 sysfs_remove_group(&dev->kobj, engine->attributes);
370 static int lp5521_do_store_load(struct lp5521_engine *engine,
371 const char *buf, size_t len)
373 struct lp5521_chip *chip = engine_to_lp5521(engine);
374 struct i2c_client *client = chip->client;
375 int ret, nrchars, offset = 0, i = 0;
378 u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
380 while ((offset < len - 1) && (i < LP5521_PROGRAM_LENGTH)) {
381 /* separate sscanfs because length is working only for %s */
382 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
383 ret = sscanf(c, "%2x", &cmd);
386 pattern[i] = (u8)cmd;
392 /* Each instruction is 16bit long. Check that length is even */
396 mutex_lock(&chip->lock);
397 ret = lp5521_load_program(engine, pattern);
398 mutex_unlock(&chip->lock);
401 dev_err(&client->dev, "failed loading pattern\n");
407 dev_err(&client->dev, "wrong pattern format\n");
411 static ssize_t store_engine_load(struct device *dev,
412 struct device_attribute *attr,
413 const char *buf, size_t len, int nr)
415 struct i2c_client *client = to_i2c_client(dev);
416 struct lp5521_chip *chip = i2c_get_clientdata(client);
417 return lp5521_do_store_load(&chip->engines[nr - 1], buf, len);
420 #define store_load(nr) \
421 static ssize_t store_engine##nr##_load(struct device *dev, \
422 struct device_attribute *attr, \
423 const char *buf, size_t len) \
425 return store_engine_load(dev, attr, buf, len, nr); \
431 static ssize_t show_engine_mode(struct device *dev,
432 struct device_attribute *attr,
435 struct i2c_client *client = to_i2c_client(dev);
436 struct lp5521_chip *chip = i2c_get_clientdata(client);
437 switch (chip->engines[nr - 1].mode) {
439 return sprintf(buf, "run\n");
440 case LP5521_CMD_LOAD:
441 return sprintf(buf, "load\n");
442 case LP5521_CMD_DISABLED:
443 return sprintf(buf, "disabled\n");
445 return sprintf(buf, "disabled\n");
449 #define show_mode(nr) \
450 static ssize_t show_engine##nr##_mode(struct device *dev, \
451 struct device_attribute *attr, \
454 return show_engine_mode(dev, attr, buf, nr); \
460 static ssize_t store_engine_mode(struct device *dev,
461 struct device_attribute *attr,
462 const char *buf, size_t len, int nr)
464 struct i2c_client *client = to_i2c_client(dev);
465 struct lp5521_chip *chip = i2c_get_clientdata(client);
466 struct lp5521_engine *engine = &chip->engines[nr - 1];
467 mutex_lock(&chip->lock);
469 if (!strncmp(buf, "run", 3))
470 lp5521_set_mode(engine, LP5521_CMD_RUN);
471 else if (!strncmp(buf, "load", 4))
472 lp5521_set_mode(engine, LP5521_CMD_LOAD);
473 else if (!strncmp(buf, "disabled", 8))
474 lp5521_set_mode(engine, LP5521_CMD_DISABLED);
476 mutex_unlock(&chip->lock);
480 #define store_mode(nr) \
481 static ssize_t store_engine##nr##_mode(struct device *dev, \
482 struct device_attribute *attr, \
483 const char *buf, size_t len) \
485 return store_engine_mode(dev, attr, buf, len, nr); \
491 static ssize_t show_max_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->max_current);
501 static ssize_t show_current(struct device *dev,
502 struct device_attribute *attr,
505 struct led_classdev *led_cdev = dev_get_drvdata(dev);
506 struct lp5521_led *led = cdev_to_led(led_cdev);
508 return sprintf(buf, "%d\n", led->led_current);
511 static ssize_t store_current(struct device *dev,
512 struct device_attribute *attr,
513 const char *buf, size_t len)
515 struct led_classdev *led_cdev = dev_get_drvdata(dev);
516 struct lp5521_led *led = cdev_to_led(led_cdev);
517 struct lp5521_chip *chip = led_to_lp5521(led);
521 if (strict_strtoul(buf, 0, &curr))
524 if (curr > led->max_current)
527 mutex_lock(&chip->lock);
528 ret = lp5521_set_led_current(chip, led->id, curr);
529 mutex_unlock(&chip->lock);
534 led->led_current = (u8)curr;
539 static ssize_t lp5521_selftest(struct device *dev,
540 struct device_attribute *attr,
543 struct i2c_client *client = to_i2c_client(dev);
544 struct lp5521_chip *chip = i2c_get_clientdata(client);
547 mutex_lock(&chip->lock);
548 ret = lp5521_run_selftest(chip, buf);
549 mutex_unlock(&chip->lock);
550 return sprintf(buf, "%s\n", ret ? "FAIL" : "OK");
553 /* led class device attributes */
554 static DEVICE_ATTR(led_current, S_IRUGO | S_IWUGO, show_current, store_current);
555 static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
557 static struct attribute *lp5521_led_attributes[] = {
558 &dev_attr_led_current.attr,
559 &dev_attr_max_current.attr,
563 static struct attribute_group lp5521_led_attribute_group = {
564 .attrs = lp5521_led_attributes
567 /* device attributes */
568 static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUGO,
569 show_engine1_mode, store_engine1_mode);
570 static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUGO,
571 show_engine2_mode, store_engine2_mode);
572 static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUGO,
573 show_engine3_mode, store_engine3_mode);
574 static DEVICE_ATTR(engine1_load, S_IWUGO, NULL, store_engine1_load);
575 static DEVICE_ATTR(engine2_load, S_IWUGO, NULL, store_engine2_load);
576 static DEVICE_ATTR(engine3_load, S_IWUGO, NULL, store_engine3_load);
577 static DEVICE_ATTR(selftest, S_IRUGO, lp5521_selftest, NULL);
579 static struct attribute *lp5521_attributes[] = {
580 &dev_attr_engine1_mode.attr,
581 &dev_attr_engine2_mode.attr,
582 &dev_attr_engine3_mode.attr,
583 &dev_attr_selftest.attr,
587 static struct attribute *lp5521_engine1_attributes[] = {
588 &dev_attr_engine1_load.attr,
592 static struct attribute *lp5521_engine2_attributes[] = {
593 &dev_attr_engine2_load.attr,
597 static struct attribute *lp5521_engine3_attributes[] = {
598 &dev_attr_engine3_load.attr,
602 static const struct attribute_group lp5521_group = {
603 .attrs = lp5521_attributes,
606 static const struct attribute_group lp5521_engine_group[] = {
607 {.attrs = lp5521_engine1_attributes },
608 {.attrs = lp5521_engine2_attributes },
609 {.attrs = lp5521_engine3_attributes },
612 static int lp5521_register_sysfs(struct i2c_client *client)
614 struct device *dev = &client->dev;
615 return sysfs_create_group(&dev->kobj, &lp5521_group);
618 static void lp5521_unregister_sysfs(struct i2c_client *client)
620 struct lp5521_chip *chip = i2c_get_clientdata(client);
621 struct device *dev = &client->dev;
624 sysfs_remove_group(&dev->kobj, &lp5521_group);
626 for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
627 if (chip->engines[i].mode == LP5521_CMD_LOAD)
628 sysfs_remove_group(&dev->kobj,
629 chip->engines[i].attributes);
632 for (i = 0; i < chip->num_leds; i++)
633 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
634 &lp5521_led_attribute_group);
637 static int __init lp5521_init_led(struct lp5521_led *led,
638 struct i2c_client *client,
639 int chan, struct lp5521_platform_data *pdata)
641 struct device *dev = &client->dev;
645 if (chan >= LP5521_MAX_LEDS)
648 if (pdata->led_config[chan].led_current == 0)
651 led->led_current = pdata->led_config[chan].led_current;
652 led->max_current = pdata->led_config[chan].max_current;
653 led->chan_nr = pdata->led_config[chan].chan_nr;
655 if (led->chan_nr >= LP5521_MAX_LEDS) {
656 dev_err(dev, "Use channel numbers between 0 and %d\n",
657 LP5521_MAX_LEDS - 1);
661 snprintf(name, sizeof(name), "%s:channel%d", client->name, chan);
662 led->cdev.brightness_set = lp5521_set_brightness;
663 led->cdev.name = name;
664 res = led_classdev_register(dev, &led->cdev);
666 dev_err(dev, "couldn't register led on channel %d\n", chan);
670 res = sysfs_create_group(&led->cdev.dev->kobj,
671 &lp5521_led_attribute_group);
673 dev_err(dev, "couldn't register current attribute\n");
674 led_classdev_unregister(&led->cdev);
680 static int lp5521_probe(struct i2c_client *client,
681 const struct i2c_device_id *id)
683 struct lp5521_chip *chip;
684 struct lp5521_platform_data *pdata;
687 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
691 i2c_set_clientdata(client, chip);
692 chip->client = client;
694 pdata = client->dev.platform_data;
697 dev_err(&client->dev, "no platform data\n");
702 mutex_init(&chip->lock);
706 if (pdata->setup_resources) {
707 ret = pdata->setup_resources();
714 usleep_range(1000, 2000); /* Keep enable down at least 1ms */
716 usleep_range(1000, 2000); /* 500us abs min. */
719 ret = lp5521_detect(client);
722 dev_err(&client->dev, "Chip not found\n");
726 dev_info(&client->dev, "%s programmable led chip found\n", id->name);
728 ret = lp5521_configure(client, lp5521_engine_group);
730 dev_err(&client->dev, "error configuring chip\n");
734 /* Initialize leds */
735 chip->num_channels = pdata->num_channels;
738 for (i = 0; i < pdata->num_channels; i++) {
739 /* Do not initialize channels that are not connected */
740 if (pdata->led_config[i].led_current == 0)
743 ret = lp5521_init_led(&chip->leds[led], client, i, pdata);
745 dev_err(&client->dev, "error initializing leds\n");
750 chip->leds[led].id = led;
751 /* Set initial LED current */
752 lp5521_set_led_current(chip, led,
753 chip->leds[led].led_current);
755 INIT_WORK(&(chip->leds[led].brightness_work),
756 lp5521_led_brightness_work);
761 ret = lp5521_register_sysfs(client);
763 dev_err(&client->dev, "registering sysfs failed\n");
768 for (i = 0; i < chip->num_leds; i++) {
769 led_classdev_unregister(&chip->leds[i].cdev);
770 cancel_work_sync(&chip->leds[i].brightness_work);
775 if (pdata->release_resources)
776 pdata->release_resources();
782 static int lp5521_remove(struct i2c_client *client)
784 struct lp5521_chip *chip = i2c_get_clientdata(client);
787 lp5521_unregister_sysfs(client);
789 for (i = 0; i < chip->num_leds; i++) {
790 led_classdev_unregister(&chip->leds[i].cdev);
791 cancel_work_sync(&chip->leds[i].brightness_work);
794 if (chip->pdata->enable)
795 chip->pdata->enable(0);
796 if (chip->pdata->release_resources)
797 chip->pdata->release_resources();
802 static const struct i2c_device_id lp5521_id[] = {
803 { "lp5521", 0 }, /* Three channel chip */
806 MODULE_DEVICE_TABLE(i2c, lp5521_id);
808 static struct i2c_driver lp5521_driver = {
812 .probe = lp5521_probe,
813 .remove = lp5521_remove,
814 .id_table = lp5521_id,
817 static int __init lp5521_init(void)
821 ret = i2c_add_driver(&lp5521_driver);
824 printk(KERN_ALERT "Adding lp5521 driver failed\n");
829 static void __exit lp5521_exit(void)
831 i2c_del_driver(&lp5521_driver);
834 module_init(lp5521_init);
835 module_exit(lp5521_exit);
837 MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
838 MODULE_DESCRIPTION("LP5521 LED engine");
839 MODULE_LICENSE("GPL v2");