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 #define cdev_to_led(c) container_of(c, struct lp5523_led, cdev)
139 static struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine)
141 return container_of(engine, struct lp5523_chip,
142 engines[engine->id - 1]);
145 static struct lp5523_chip *led_to_lp5523(struct lp5523_led *led)
147 return container_of(led, struct lp5523_chip,
151 static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode);
152 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode);
153 static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern);
155 static void lp5523_led_brightness_work(struct work_struct *work);
157 static int lp5523_write(struct i2c_client *client, u8 reg, u8 value)
159 return i2c_smbus_write_byte_data(client, reg, value);
162 static int lp5523_read(struct i2c_client *client, u8 reg, u8 *buf)
164 s32 ret = i2c_smbus_read_byte_data(client, reg);
173 static int lp5523_detect(struct i2c_client *client)
178 ret = lp5523_write(client, LP5523_REG_ENABLE, 0x40);
181 ret = lp5523_read(client, LP5523_REG_ENABLE, &buf);
190 static int lp5523_configure(struct i2c_client *client)
192 struct lp5523_chip *chip = i2c_get_clientdata(client);
196 /* one pattern per engine setting led mux start and stop addresses */
197 u8 pattern[][LP5523_PROGRAM_LENGTH] = {
198 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
199 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
200 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
203 lp5523_write(client, LP5523_REG_RESET, 0xff);
205 usleep_range(10000, 100000);
207 ret |= lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE);
208 /* Chip startup time after reset is 500 us */
209 usleep_range(1000, 10000);
211 ret |= lp5523_write(client, LP5523_REG_CONFIG,
212 LP5523_AUTO_INC | LP5523_PWR_SAVE |
213 LP5523_CP_AUTO | LP5523_AUTO_CLK |
214 LP5523_PWM_PWR_SAVE);
216 /* turn on all leds */
217 ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
218 ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
220 /* hardcode 32 bytes of memory for each engine from program memory */
221 ret |= lp5523_write(client, LP5523_REG_CH1_PROG_START, 0x00);
222 ret |= lp5523_write(client, LP5523_REG_CH2_PROG_START, 0x10);
223 ret |= lp5523_write(client, LP5523_REG_CH3_PROG_START, 0x20);
225 /* write led mux address space for each channel */
226 ret |= lp5523_load_program(&chip->engines[0], pattern[0]);
227 ret |= lp5523_load_program(&chip->engines[1], pattern[1]);
228 ret |= lp5523_load_program(&chip->engines[2], pattern[2]);
231 dev_err(&client->dev, "could not load mux programs\n");
235 /* set all engines exec state and mode to run 00101010 */
236 ret |= lp5523_write(client, LP5523_REG_ENABLE,
237 (LP5523_CMD_RUN | LP5523_ENABLE));
239 ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_RUN);
242 dev_err(&client->dev, "could not start mux programs\n");
246 /* Wait 3ms and check the engine status */
247 usleep_range(3000, 20000);
248 lp5523_read(client, LP5523_REG_STATUS, &status);
249 status &= LP5523_ENG_STATUS_MASK;
251 if (status == LP5523_ENG_STATUS_MASK) {
252 dev_dbg(&client->dev, "all engines configured\n");
254 dev_info(&client->dev, "status == %x\n", status);
255 dev_err(&client->dev, "cound not configure LED engine\n");
259 dev_info(&client->dev, "disabling engines\n");
261 ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED);
266 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode)
268 struct lp5523_chip *chip = engine_to_lp5523(engine);
269 struct i2c_client *client = chip->client;
273 ret = lp5523_read(client, LP5523_REG_OP_MODE, &engine_state);
277 engine_state &= ~(engine->engine_mask);
279 /* set mode only for this engine */
280 mode &= engine->engine_mask;
282 engine_state |= mode;
284 ret |= lp5523_write(client, LP5523_REG_OP_MODE, engine_state);
289 static int lp5523_load_mux(struct lp5523_engine *engine, u16 mux)
291 struct lp5523_chip *chip = engine_to_lp5523(engine);
292 struct i2c_client *client = chip->client;
295 ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
297 ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, engine->mux_page);
298 ret |= lp5523_write(client, LP5523_REG_PROG_MEM,
300 ret |= lp5523_write(client, LP5523_REG_PROG_MEM + 1, (u8)(mux));
301 engine->led_mux = mux;
306 static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern)
308 struct lp5523_chip *chip = engine_to_lp5523(engine);
309 struct i2c_client *client = chip->client;
313 ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
315 ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL,
317 ret |= i2c_smbus_write_i2c_block_data(client, LP5523_REG_PROG_MEM,
318 LP5523_PROGRAM_LENGTH, pattern);
323 static int lp5523_run_program(struct lp5523_engine *engine)
325 struct lp5523_chip *chip = engine_to_lp5523(engine);
326 struct i2c_client *client = chip->client;
329 ret = lp5523_write(client, LP5523_REG_ENABLE,
330 LP5523_CMD_RUN | LP5523_ENABLE);
334 ret = lp5523_set_engine_mode(engine, LP5523_CMD_RUN);
339 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
343 len = len < LP5523_LEDS ? len : LP5523_LEDS;
344 for (i = 0; i < len; i++) {
363 static void lp5523_mux_to_array(u16 led_mux, char *array)
366 for (i = 0; i < LP5523_LEDS; i++)
367 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
372 /*--------------------------------------------------------------*/
373 /* Sysfs interface */
374 /*--------------------------------------------------------------*/
376 static ssize_t show_engine_leds(struct device *dev,
377 struct device_attribute *attr,
380 struct i2c_client *client = to_i2c_client(dev);
381 struct lp5523_chip *chip = i2c_get_clientdata(client);
382 char mux[LP5523_LEDS + 1];
384 lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
386 return sprintf(buf, "%s\n", mux);
389 #define show_leds(nr) \
390 static ssize_t show_engine##nr##_leds(struct device *dev, \
391 struct device_attribute *attr, \
394 return show_engine_leds(dev, attr, buf, nr); \
400 static ssize_t store_engine_leds(struct device *dev,
401 struct device_attribute *attr,
402 const char *buf, size_t len, int nr)
404 struct i2c_client *client = to_i2c_client(dev);
405 struct lp5523_chip *chip = i2c_get_clientdata(client);
408 if (lp5523_mux_parse(buf, &mux, len))
411 if (lp5523_load_mux(&chip->engines[nr - 1], mux))
417 #define store_leds(nr) \
418 static ssize_t store_engine##nr##_leds(struct device *dev, \
419 struct device_attribute *attr, \
420 const char *buf, size_t len) \
422 return store_engine_leds(dev, attr, buf, len, nr); \
428 static ssize_t lp5523_selftest(struct device *dev,
429 struct device_attribute *attr,
432 struct i2c_client *client = to_i2c_client(dev);
433 struct lp5523_chip *chip = i2c_get_clientdata(client);
438 mutex_lock(&chip->lock);
440 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
444 /* Check that ext clock is really in use if requested */
445 if ((chip->pdata) && (chip->pdata->clock_mode == LP5523_CLOCK_EXT))
446 if ((status & LP5523_EXT_CLK_USED) == 0)
449 /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
450 lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL,
451 LP5523_EN_LEDTEST | 16);
452 usleep_range(3000, 10000);
453 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
454 if (!(status & LP5523_LEDTEST_DONE))
455 usleep_range(3000, 10000);
457 ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd);
458 vdd--; /* There may be some fluctuation in measurement */
460 for (i = 0; i < LP5523_LEDS; i++) {
461 /* Skip non-existing channels */
462 if (chip->pdata->led_config[i].led_current == 0)
465 /* Set default current */
466 lp5523_write(chip->client,
467 LP5523_REG_LED_CURRENT_BASE + i,
468 chip->pdata->led_config[i].led_current);
470 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff);
471 /* let current stabilize 2ms before measurements start */
472 usleep_range(2000, 10000);
473 lp5523_write(chip->client,
474 LP5523_REG_LED_TEST_CTRL,
475 LP5523_EN_LEDTEST | i);
476 /* ledtest takes 2.7ms */
477 usleep_range(3000, 10000);
478 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
479 if (!(status & LP5523_LEDTEST_DONE))
480 usleep_range(3000, 10000);
481 ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc);
483 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
484 pos += sprintf(buf + pos, "LED %d FAIL\n", i);
486 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00);
488 /* Restore current */
489 lp5523_write(chip->client,
490 LP5523_REG_LED_CURRENT_BASE + i,
491 chip->leds[led].led_current);
495 pos = sprintf(buf, "OK\n");
498 pos = sprintf(buf, "FAIL\n");
501 mutex_unlock(&chip->lock);
506 static void lp5523_set_brightness(struct led_classdev *cdev,
507 enum led_brightness brightness)
509 struct lp5523_led *led = cdev_to_led(cdev);
511 led->brightness = (u8)brightness;
513 schedule_work(&led->brightness_work);
516 static void lp5523_led_brightness_work(struct work_struct *work)
518 struct lp5523_led *led = container_of(work,
521 struct lp5523_chip *chip = led_to_lp5523(led);
522 struct i2c_client *client = chip->client;
524 mutex_lock(&chip->lock);
526 lp5523_write(client, LP5523_REG_LED_PWM_BASE + led->chan_nr,
529 mutex_unlock(&chip->lock);
532 static int lp5523_do_store_load(struct lp5523_engine *engine,
533 const char *buf, size_t len)
535 struct lp5523_chip *chip = engine_to_lp5523(engine);
536 struct i2c_client *client = chip->client;
537 int ret, nrchars, offset = 0, i = 0;
540 u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
542 while ((offset < len - 1) && (i < LP5523_PROGRAM_LENGTH)) {
543 /* separate sscanfs because length is working only for %s */
544 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
545 ret = sscanf(c, "%2x", &cmd);
548 pattern[i] = (u8)cmd;
554 /* Each instruction is 16bit long. Check that length is even */
558 mutex_lock(&chip->lock);
560 ret = lp5523_load_program(engine, pattern);
561 mutex_unlock(&chip->lock);
564 dev_err(&client->dev, "failed loading pattern\n");
570 dev_err(&client->dev, "wrong pattern format\n");
574 static ssize_t store_engine_load(struct device *dev,
575 struct device_attribute *attr,
576 const char *buf, size_t len, int nr)
578 struct i2c_client *client = to_i2c_client(dev);
579 struct lp5523_chip *chip = i2c_get_clientdata(client);
580 return lp5523_do_store_load(&chip->engines[nr - 1], buf, len);
583 #define store_load(nr) \
584 static ssize_t store_engine##nr##_load(struct device *dev, \
585 struct device_attribute *attr, \
586 const char *buf, size_t len) \
588 return store_engine_load(dev, attr, buf, len, nr); \
594 static ssize_t show_engine_mode(struct device *dev,
595 struct device_attribute *attr,
598 struct i2c_client *client = to_i2c_client(dev);
599 struct lp5523_chip *chip = i2c_get_clientdata(client);
600 switch (chip->engines[nr - 1].mode) {
602 return sprintf(buf, "run\n");
603 case LP5523_CMD_LOAD:
604 return sprintf(buf, "load\n");
605 case LP5523_CMD_DISABLED:
606 return sprintf(buf, "disabled\n");
608 return sprintf(buf, "disabled\n");
612 #define show_mode(nr) \
613 static ssize_t show_engine##nr##_mode(struct device *dev, \
614 struct device_attribute *attr, \
617 return show_engine_mode(dev, attr, buf, nr); \
623 static ssize_t store_engine_mode(struct device *dev,
624 struct device_attribute *attr,
625 const char *buf, size_t len, int nr)
627 struct i2c_client *client = to_i2c_client(dev);
628 struct lp5523_chip *chip = i2c_get_clientdata(client);
629 struct lp5523_engine *engine = &chip->engines[nr - 1];
630 mutex_lock(&chip->lock);
632 if (!strncmp(buf, "run", 3))
633 lp5523_set_mode(engine, LP5523_CMD_RUN);
634 else if (!strncmp(buf, "load", 4))
635 lp5523_set_mode(engine, LP5523_CMD_LOAD);
636 else if (!strncmp(buf, "disabled", 8))
637 lp5523_set_mode(engine, LP5523_CMD_DISABLED);
639 mutex_unlock(&chip->lock);
643 #define store_mode(nr) \
644 static ssize_t store_engine##nr##_mode(struct device *dev, \
645 struct device_attribute *attr, \
646 const char *buf, size_t len) \
648 return store_engine_mode(dev, attr, buf, len, nr); \
654 static ssize_t show_max_current(struct device *dev,
655 struct device_attribute *attr,
658 struct led_classdev *led_cdev = dev_get_drvdata(dev);
659 struct lp5523_led *led = cdev_to_led(led_cdev);
661 return sprintf(buf, "%d\n", led->max_current);
664 static ssize_t show_current(struct device *dev,
665 struct device_attribute *attr,
668 struct led_classdev *led_cdev = dev_get_drvdata(dev);
669 struct lp5523_led *led = cdev_to_led(led_cdev);
671 return sprintf(buf, "%d\n", led->led_current);
674 static ssize_t store_current(struct device *dev,
675 struct device_attribute *attr,
676 const char *buf, size_t len)
678 struct led_classdev *led_cdev = dev_get_drvdata(dev);
679 struct lp5523_led *led = cdev_to_led(led_cdev);
680 struct lp5523_chip *chip = led_to_lp5523(led);
684 if (strict_strtoul(buf, 0, &curr))
687 if (curr > led->max_current)
690 mutex_lock(&chip->lock);
691 ret = lp5523_write(chip->client,
692 LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
694 mutex_unlock(&chip->lock);
699 led->led_current = (u8)curr;
704 /* led class device attributes */
705 static DEVICE_ATTR(led_current, S_IRUGO | S_IWUGO, show_current, store_current);
706 static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
708 static struct attribute *lp5523_led_attributes[] = {
709 &dev_attr_led_current.attr,
710 &dev_attr_max_current.attr,
714 static struct attribute_group lp5523_led_attribute_group = {
715 .attrs = lp5523_led_attributes
718 /* device attributes */
719 static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUGO,
720 show_engine1_mode, store_engine1_mode);
721 static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUGO,
722 show_engine2_mode, store_engine2_mode);
723 static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUGO,
724 show_engine3_mode, store_engine3_mode);
725 static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUGO,
726 show_engine1_leds, store_engine1_leds);
727 static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUGO,
728 show_engine2_leds, store_engine2_leds);
729 static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUGO,
730 show_engine3_leds, store_engine3_leds);
731 static DEVICE_ATTR(engine1_load, S_IWUGO, NULL, store_engine1_load);
732 static DEVICE_ATTR(engine2_load, S_IWUGO, NULL, store_engine2_load);
733 static DEVICE_ATTR(engine3_load, S_IWUGO, NULL, store_engine3_load);
734 static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL);
736 static struct attribute *lp5523_attributes[] = {
737 &dev_attr_engine1_mode.attr,
738 &dev_attr_engine2_mode.attr,
739 &dev_attr_engine3_mode.attr,
740 &dev_attr_selftest.attr,
744 static struct attribute *lp5523_engine1_attributes[] = {
745 &dev_attr_engine1_load.attr,
746 &dev_attr_engine1_leds.attr,
750 static struct attribute *lp5523_engine2_attributes[] = {
751 &dev_attr_engine2_load.attr,
752 &dev_attr_engine2_leds.attr,
756 static struct attribute *lp5523_engine3_attributes[] = {
757 &dev_attr_engine3_load.attr,
758 &dev_attr_engine3_leds.attr,
762 static const struct attribute_group lp5523_group = {
763 .attrs = lp5523_attributes,
766 static const struct attribute_group lp5523_engine_group[] = {
767 {.attrs = lp5523_engine1_attributes },
768 {.attrs = lp5523_engine2_attributes },
769 {.attrs = lp5523_engine3_attributes },
772 static int lp5523_register_sysfs(struct i2c_client *client)
774 struct device *dev = &client->dev;
777 ret = sysfs_create_group(&dev->kobj, &lp5523_group);
784 static void lp5523_unregister_sysfs(struct i2c_client *client)
786 struct lp5523_chip *chip = i2c_get_clientdata(client);
787 struct device *dev = &client->dev;
790 sysfs_remove_group(&dev->kobj, &lp5523_group);
792 for (i = 0; i < ARRAY_SIZE(chip->engines); i++)
793 if (chip->engines[i].mode == LP5523_CMD_LOAD)
794 sysfs_remove_group(&dev->kobj, &lp5523_engine_group[i]);
796 for (i = 0; i < chip->num_leds; i++)
797 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
798 &lp5523_led_attribute_group);
801 /*--------------------------------------------------------------*/
802 /* Set chip operating mode */
803 /*--------------------------------------------------------------*/
804 static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode)
807 struct lp5523_chip *chip = engine_to_lp5523(engine);
808 struct i2c_client *client = chip->client;
809 struct device *dev = &client->dev;
812 /* if in that mode already do nothing, except for run */
813 if (mode == engine->mode && mode != LP5523_CMD_RUN)
816 if (mode == LP5523_CMD_RUN) {
817 ret = lp5523_run_program(engine);
818 } else if (mode == LP5523_CMD_LOAD) {
819 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
820 lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
822 ret = sysfs_create_group(&dev->kobj, engine->attributes);
825 } else if (mode == LP5523_CMD_DISABLED) {
826 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
829 /* remove load attribute from sysfs if not in load mode */
830 if (engine->mode == LP5523_CMD_LOAD && mode != LP5523_CMD_LOAD)
831 sysfs_remove_group(&dev->kobj, engine->attributes);
838 /*--------------------------------------------------------------*/
839 /* Probe, Attach, Remove */
840 /*--------------------------------------------------------------*/
841 static int __init lp5523_init_engine(struct lp5523_engine *engine, int id)
843 if (id < 1 || id > LP5523_ENGINES)
846 engine->engine_mask = LP5523_ENG_MASK_BASE >> SHIFT_MASK(id);
847 engine->prog_page = id - 1;
848 engine->mux_page = id + 2;
849 engine->attributes = &lp5523_engine_group[id - 1];
854 static int __init lp5523_init_led(struct lp5523_led *led, struct device *dev,
855 int chan, struct lp5523_platform_data *pdata)
860 if (chan >= LP5523_LEDS)
863 if (pdata->led_config[chan].led_current) {
864 led->led_current = pdata->led_config[chan].led_current;
865 led->max_current = pdata->led_config[chan].max_current;
866 led->chan_nr = pdata->led_config[chan].chan_nr;
868 if (led->chan_nr >= LP5523_LEDS) {
869 dev_err(dev, "Use channel numbers between 0 and %d\n",
874 snprintf(name, 32, "lp5523:channel%d", chan);
876 led->cdev.name = name;
877 led->cdev.brightness_set = lp5523_set_brightness;
878 res = led_classdev_register(dev, &led->cdev);
880 dev_err(dev, "couldn't register led on channel %d\n",
884 res = sysfs_create_group(&led->cdev.dev->kobj,
885 &lp5523_led_attribute_group);
887 dev_err(dev, "couldn't register current attribute\n");
888 led_classdev_unregister(&led->cdev);
892 led->led_current = 0;
897 static struct i2c_driver lp5523_driver;
899 static int lp5523_probe(struct i2c_client *client,
900 const struct i2c_device_id *id)
902 struct lp5523_chip *chip;
903 struct lp5523_platform_data *pdata;
906 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
910 i2c_set_clientdata(client, chip);
911 chip->client = client;
913 pdata = client->dev.platform_data;
916 dev_err(&client->dev, "no platform data\n");
921 mutex_init(&chip->lock);
925 if (pdata->setup_resources) {
926 ret = pdata->setup_resources();
933 usleep_range(1000, 10000);
935 usleep_range(1000, 10000); /* Spec says min 500us */
938 ret = lp5523_detect(client);
942 dev_info(&client->dev, "LP5523 Programmable led chip found\n");
944 /* Initialize engines */
945 for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
946 ret = lp5523_init_engine(&chip->engines[i], i + 1);
948 dev_err(&client->dev, "error initializing engine\n");
952 ret = lp5523_configure(client);
954 dev_err(&client->dev, "error configuring chip\n");
958 /* Initialize leds */
959 chip->num_channels = pdata->num_channels;
962 for (i = 0; i < pdata->num_channels; i++) {
963 /* Do not initialize channels that are not connected */
964 if (pdata->led_config[i].led_current == 0)
967 ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata);
969 dev_err(&client->dev, "error initializing leds\n");
974 chip->leds[led].id = led;
975 /* Set LED current */
977 LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
978 chip->leds[led].led_current);
980 INIT_WORK(&(chip->leds[led].brightness_work),
981 lp5523_led_brightness_work);
986 ret = lp5523_register_sysfs(client);
988 dev_err(&client->dev, "registering sysfs failed\n");
993 for (i = 0; i < chip->num_leds; i++) {
994 led_classdev_unregister(&chip->leds[i].cdev);
995 cancel_work_sync(&chip->leds[i].brightness_work);
1000 if (pdata->release_resources)
1001 pdata->release_resources();
1007 static int lp5523_remove(struct i2c_client *client)
1009 struct lp5523_chip *chip = i2c_get_clientdata(client);
1012 lp5523_unregister_sysfs(client);
1014 for (i = 0; i < chip->num_leds; i++) {
1015 led_classdev_unregister(&chip->leds[i].cdev);
1016 cancel_work_sync(&chip->leds[i].brightness_work);
1019 if (chip->pdata->enable)
1020 chip->pdata->enable(0);
1021 if (chip->pdata->release_resources)
1022 chip->pdata->release_resources();
1027 static const struct i2c_device_id lp5523_id[] = {
1032 MODULE_DEVICE_TABLE(i2c, lp5523_id);
1034 static struct i2c_driver lp5523_driver = {
1038 .probe = lp5523_probe,
1039 .remove = lp5523_remove,
1040 .id_table = lp5523_id,
1043 static int __init lp5523_init(void)
1047 ret = i2c_add_driver(&lp5523_driver);
1050 printk(KERN_ALERT "Adding lp5523 driver failed\n");
1055 static void __exit lp5523_exit(void)
1057 i2c_del_driver(&lp5523_driver);
1060 module_init(lp5523_init);
1061 module_exit(lp5523_exit);
1063 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
1064 MODULE_DESCRIPTION("LP5523 LED engine");
1065 MODULE_LICENSE("GPL");