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 enum lp5523_chip_id {
112 struct lp5523_engine {
126 struct led_classdev cdev;
127 struct work_struct brightness_work;
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;
141 static inline struct lp5523_led *cdev_to_led(struct led_classdev *cdev)
143 return container_of(cdev, struct lp5523_led, cdev);
146 static inline struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine)
148 return container_of(engine, struct lp5523_chip,
149 engines[engine->id - 1]);
152 static inline struct lp5523_chip *led_to_lp5523(struct lp5523_led *led)
154 return container_of(led, struct lp5523_chip,
158 static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode);
159 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode);
160 static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern);
162 static void lp5523_led_brightness_work(struct work_struct *work);
164 static int lp5523_write(struct i2c_client *client, u8 reg, u8 value)
166 return i2c_smbus_write_byte_data(client, reg, value);
169 static int lp5523_read(struct i2c_client *client, u8 reg, u8 *buf)
171 s32 ret = i2c_smbus_read_byte_data(client, reg);
180 static int lp5523_detect(struct i2c_client *client)
185 ret = lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE);
188 ret = lp5523_read(client, LP5523_REG_ENABLE, &buf);
197 static int lp5523_configure(struct i2c_client *client)
199 struct lp5523_chip *chip = i2c_get_clientdata(client);
203 /* one pattern per engine setting led mux start and stop addresses */
204 static const u8 pattern[][LP5523_PROGRAM_LENGTH] = {
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},
210 ret |= lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE);
211 /* Chip startup time is 500 us, 1 - 2 ms gives some margin */
212 usleep_range(1000, 2000);
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);
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);
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);
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]);
234 dev_err(&client->dev, "could not load mux programs\n");
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));
242 ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_RUN);
245 dev_err(&client->dev, "could not start mux programs\n");
249 /* Let the programs run for couple of ms and check the engine status */
250 usleep_range(3000, 6000);
251 ret = lp5523_read(client, LP5523_REG_STATUS, &status);
255 status &= LP5523_ENG_STATUS_MASK;
257 if (status == LP5523_ENG_STATUS_MASK) {
258 dev_dbg(&client->dev, "all engines configured\n");
260 dev_info(&client->dev, "status == %x\n", status);
261 dev_err(&client->dev, "cound not configure LED engine\n");
265 dev_info(&client->dev, "disabling engines\n");
267 ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED);
272 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode)
274 struct lp5523_chip *chip = engine_to_lp5523(engine);
275 struct i2c_client *client = chip->client;
279 ret = lp5523_read(client, LP5523_REG_OP_MODE, &engine_state);
283 engine_state &= ~(engine->engine_mask);
285 /* set mode only for this engine */
286 mode &= engine->engine_mask;
288 engine_state |= mode;
290 ret |= lp5523_write(client, LP5523_REG_OP_MODE, engine_state);
295 static int lp5523_load_mux(struct lp5523_engine *engine, u16 mux)
297 struct lp5523_chip *chip = engine_to_lp5523(engine);
298 struct i2c_client *client = chip->client;
301 ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
303 ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, engine->mux_page);
304 ret |= lp5523_write(client, LP5523_REG_PROG_MEM,
306 ret |= lp5523_write(client, LP5523_REG_PROG_MEM + 1, (u8)(mux));
307 engine->led_mux = mux;
312 static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern)
314 struct lp5523_chip *chip = engine_to_lp5523(engine);
315 struct i2c_client *client = chip->client;
319 ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
321 ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL,
323 ret |= i2c_smbus_write_i2c_block_data(client, LP5523_REG_PROG_MEM,
324 LP5523_PROGRAM_LENGTH, pattern);
329 static int lp5523_run_program(struct lp5523_engine *engine)
331 struct lp5523_chip *chip = engine_to_lp5523(engine);
332 struct i2c_client *client = chip->client;
335 ret = lp5523_write(client, LP5523_REG_ENABLE,
336 LP5523_CMD_RUN | LP5523_ENABLE);
340 ret = lp5523_set_engine_mode(engine, LP5523_CMD_RUN);
345 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
350 len = min_t(int, len, LP5523_LEDS);
351 for (i = 0; i < len; i++) {
370 static void lp5523_mux_to_array(u16 led_mux, char *array)
373 for (i = 0; i < LP5523_LEDS; i++)
374 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
379 /*--------------------------------------------------------------*/
380 /* Sysfs interface */
381 /*--------------------------------------------------------------*/
383 static ssize_t show_engine_leds(struct device *dev,
384 struct device_attribute *attr,
387 struct i2c_client *client = to_i2c_client(dev);
388 struct lp5523_chip *chip = i2c_get_clientdata(client);
389 char mux[LP5523_LEDS + 1];
391 lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
393 return sprintf(buf, "%s\n", mux);
396 #define show_leds(nr) \
397 static ssize_t show_engine##nr##_leds(struct device *dev, \
398 struct device_attribute *attr, \
401 return show_engine_leds(dev, attr, buf, nr); \
407 static ssize_t store_engine_leds(struct device *dev,
408 struct device_attribute *attr,
409 const char *buf, size_t len, int nr)
411 struct i2c_client *client = to_i2c_client(dev);
412 struct lp5523_chip *chip = i2c_get_clientdata(client);
416 if (lp5523_mux_parse(buf, &mux, len))
419 mutex_lock(&chip->lock);
421 if (chip->engines[nr - 1].mode != LP5523_CMD_LOAD)
424 if (lp5523_load_mux(&chip->engines[nr - 1], mux))
429 mutex_unlock(&chip->lock);
433 #define store_leds(nr) \
434 static ssize_t store_engine##nr##_leds(struct device *dev, \
435 struct device_attribute *attr, \
436 const char *buf, size_t len) \
438 return store_engine_leds(dev, attr, buf, len, nr); \
444 static ssize_t lp5523_selftest(struct device *dev,
445 struct device_attribute *attr,
448 struct i2c_client *client = to_i2c_client(dev);
449 struct lp5523_chip *chip = i2c_get_clientdata(client);
454 mutex_lock(&chip->lock);
456 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
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)
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);
468 usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
469 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
473 if (!(status & LP5523_LEDTEST_DONE))
474 usleep_range(3000, 6000); /* Was not ready. Wait little bit */
476 ret = lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd);
480 vdd--; /* There may be some fluctuation in measurement */
482 for (i = 0; i < LP5523_LEDS; i++) {
483 /* Skip non-existing channels */
484 if (chip->pdata->led_config[i].led_current == 0)
487 /* Set default current */
488 lp5523_write(chip->client,
489 LP5523_REG_LED_CURRENT_BASE + i,
490 chip->pdata->led_config[i].led_current);
492 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff);
493 /* let current stabilize 2 - 4ms before measurements start */
494 usleep_range(2000, 4000);
495 lp5523_write(chip->client,
496 LP5523_REG_LED_TEST_CTRL,
497 LP5523_EN_LEDTEST | i);
498 /* ADC conversion time is 2.7 ms typically */
499 usleep_range(3000, 6000);
500 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
504 if (!(status & LP5523_LEDTEST_DONE))
505 usleep_range(3000, 6000);/* Was not ready. Wait. */
506 ret = lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc);
510 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
511 pos += sprintf(buf + pos, "LED %d FAIL\n", i);
513 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00);
515 /* Restore current */
516 lp5523_write(chip->client,
517 LP5523_REG_LED_CURRENT_BASE + i,
518 chip->leds[led].led_current);
522 pos = sprintf(buf, "OK\n");
525 pos = sprintf(buf, "FAIL\n");
528 mutex_unlock(&chip->lock);
533 static void lp5523_set_brightness(struct led_classdev *cdev,
534 enum led_brightness brightness)
536 struct lp5523_led *led = cdev_to_led(cdev);
538 led->brightness = (u8)brightness;
540 schedule_work(&led->brightness_work);
543 static void lp5523_led_brightness_work(struct work_struct *work)
545 struct lp5523_led *led = container_of(work,
548 struct lp5523_chip *chip = led_to_lp5523(led);
549 struct i2c_client *client = chip->client;
551 mutex_lock(&chip->lock);
553 lp5523_write(client, LP5523_REG_LED_PWM_BASE + led->chan_nr,
556 mutex_unlock(&chip->lock);
559 static int lp5523_do_store_load(struct lp5523_engine *engine,
560 const char *buf, size_t len)
562 struct lp5523_chip *chip = engine_to_lp5523(engine);
563 struct i2c_client *client = chip->client;
564 int ret, nrchars, offset = 0, i = 0;
567 u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
569 if (engine->mode != LP5523_CMD_LOAD)
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);
578 pattern[i] = (u8)cmd;
584 /* Each instruction is 16bit long. Check that length is even */
588 mutex_lock(&chip->lock);
589 ret = lp5523_load_program(engine, pattern);
590 mutex_unlock(&chip->lock);
593 dev_err(&client->dev, "failed loading pattern\n");
599 dev_err(&client->dev, "wrong pattern format\n");
603 static ssize_t store_engine_load(struct device *dev,
604 struct device_attribute *attr,
605 const char *buf, size_t len, int nr)
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);
612 #define store_load(nr) \
613 static ssize_t store_engine##nr##_load(struct device *dev, \
614 struct device_attribute *attr, \
615 const char *buf, size_t len) \
617 return store_engine_load(dev, attr, buf, len, nr); \
623 static ssize_t show_engine_mode(struct device *dev,
624 struct device_attribute *attr,
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) {
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");
637 return sprintf(buf, "disabled\n");
641 #define show_mode(nr) \
642 static ssize_t show_engine##nr##_mode(struct device *dev, \
643 struct device_attribute *attr, \
646 return show_engine_mode(dev, attr, buf, nr); \
652 static ssize_t store_engine_mode(struct device *dev,
653 struct device_attribute *attr,
654 const char *buf, size_t len, int nr)
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);
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);
668 mutex_unlock(&chip->lock);
672 #define store_mode(nr) \
673 static ssize_t store_engine##nr##_mode(struct device *dev, \
674 struct device_attribute *attr, \
675 const char *buf, size_t len) \
677 return store_engine_mode(dev, attr, buf, len, nr); \
683 static ssize_t show_max_current(struct device *dev,
684 struct device_attribute *attr,
687 struct led_classdev *led_cdev = dev_get_drvdata(dev);
688 struct lp5523_led *led = cdev_to_led(led_cdev);
690 return sprintf(buf, "%d\n", led->max_current);
693 static ssize_t show_current(struct device *dev,
694 struct device_attribute *attr,
697 struct led_classdev *led_cdev = dev_get_drvdata(dev);
698 struct lp5523_led *led = cdev_to_led(led_cdev);
700 return sprintf(buf, "%d\n", led->led_current);
703 static ssize_t store_current(struct device *dev,
704 struct device_attribute *attr,
705 const char *buf, size_t len)
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);
713 if (kstrtoul(buf, 0, &curr))
716 if (curr > led->max_current)
719 mutex_lock(&chip->lock);
720 ret = lp5523_write(chip->client,
721 LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
723 mutex_unlock(&chip->lock);
728 led->led_current = (u8)curr;
733 /* led class device attributes */
734 static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current);
735 static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
737 static struct attribute *lp5523_led_attributes[] = {
738 &dev_attr_led_current.attr,
739 &dev_attr_max_current.attr,
743 static struct attribute_group lp5523_led_attribute_group = {
744 .attrs = lp5523_led_attributes
747 /* device attributes */
748 static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR,
749 show_engine1_mode, store_engine1_mode);
750 static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR,
751 show_engine2_mode, store_engine2_mode);
752 static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR,
753 show_engine3_mode, store_engine3_mode);
754 static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUSR,
755 show_engine1_leds, store_engine1_leds);
756 static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUSR,
757 show_engine2_leds, store_engine2_leds);
758 static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUSR,
759 show_engine3_leds, store_engine3_leds);
760 static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load);
761 static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load);
762 static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load);
763 static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL);
765 static 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,
770 &dev_attr_engine1_load.attr,
771 &dev_attr_engine1_leds.attr,
772 &dev_attr_engine2_load.attr,
773 &dev_attr_engine2_leds.attr,
774 &dev_attr_engine3_load.attr,
775 &dev_attr_engine3_leds.attr,
779 static const struct attribute_group lp5523_group = {
780 .attrs = lp5523_attributes,
783 static int lp5523_register_sysfs(struct i2c_client *client)
785 struct device *dev = &client->dev;
788 ret = sysfs_create_group(&dev->kobj, &lp5523_group);
795 static void lp5523_unregister_sysfs(struct i2c_client *client)
797 struct lp5523_chip *chip = i2c_get_clientdata(client);
798 struct device *dev = &client->dev;
801 sysfs_remove_group(&dev->kobj, &lp5523_group);
803 for (i = 0; i < chip->num_leds; i++)
804 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
805 &lp5523_led_attribute_group);
808 /*--------------------------------------------------------------*/
809 /* Set chip operating mode */
810 /*--------------------------------------------------------------*/
811 static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode)
813 /* if in that mode already do nothing, except for run */
814 if (mode == engine->mode && mode != LP5523_CMD_RUN)
819 lp5523_run_program(engine);
821 case LP5523_CMD_LOAD:
822 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
823 lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
825 case LP5523_CMD_DISABLED:
826 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
835 /*--------------------------------------------------------------*/
836 /* Probe, Attach, Remove */
837 /*--------------------------------------------------------------*/
838 static int __init lp5523_init_engine(struct lp5523_engine *engine, int id)
840 if (id < 1 || id > LP5523_ENGINES)
843 engine->engine_mask = LP5523_ENG_MASK_BASE >> SHIFT_MASK(id);
844 engine->prog_page = id - 1;
845 engine->mux_page = id + 2;
850 static int lp5523_init_led(struct lp5523_led *led, struct device *dev,
851 int chan, struct lp5523_platform_data *pdata,
852 const char *chip_name)
857 if (chan >= LP5523_LEDS)
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;
865 if (led->chan_nr >= LP5523_LEDS) {
866 dev_err(dev, "Use channel numbers between 0 and %d\n",
871 if (pdata->led_config[chan].name) {
872 led->cdev.name = pdata->led_config[chan].name;
874 snprintf(name, sizeof(name), "%s:channel%d",
875 pdata->label ? : chip_name, chan);
876 led->cdev.name = name;
879 led->cdev.brightness_set = lp5523_set_brightness;
880 res = led_classdev_register(dev, &led->cdev);
882 dev_err(dev, "couldn't register led on channel %d\n",
886 res = sysfs_create_group(&led->cdev.dev->kobj,
887 &lp5523_led_attribute_group);
889 dev_err(dev, "couldn't register current attribute\n");
890 led_classdev_unregister(&led->cdev);
894 led->led_current = 0;
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 = devm_kzalloc(&client->dev, 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");
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, "%s Programmable led chip found\n", id->name);
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 INIT_WORK(&chip->leds[led].brightness_work,
972 lp5523_led_brightness_work);
974 ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata,
977 dev_err(&client->dev, "error initializing leds\n");
982 chip->leds[led].id = led;
983 /* Set LED current */
985 LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
986 chip->leds[led].led_current);
991 ret = lp5523_register_sysfs(client);
993 dev_err(&client->dev, "registering sysfs failed\n");
998 for (i = 0; i < chip->num_leds; i++) {
999 led_classdev_unregister(&chip->leds[i].cdev);
1000 flush_work(&chip->leds[i].brightness_work);
1005 if (pdata->release_resources)
1006 pdata->release_resources();
1010 static int lp5523_remove(struct i2c_client *client)
1012 struct lp5523_chip *chip = i2c_get_clientdata(client);
1015 /* Disable engine mode */
1016 lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED);
1018 lp5523_unregister_sysfs(client);
1020 for (i = 0; i < chip->num_leds; i++) {
1021 led_classdev_unregister(&chip->leds[i].cdev);
1022 flush_work(&chip->leds[i].brightness_work);
1025 if (chip->pdata->enable)
1026 chip->pdata->enable(0);
1027 if (chip->pdata->release_resources)
1028 chip->pdata->release_resources();
1032 static const struct i2c_device_id lp5523_id[] = {
1033 { "lp5523", LP5523 },
1034 { "lp55231", LP55231 },
1038 MODULE_DEVICE_TABLE(i2c, lp5523_id);
1040 static struct i2c_driver lp5523_driver = {
1044 .probe = lp5523_probe,
1045 .remove = lp5523_remove,
1046 .id_table = lp5523_id,
1049 module_i2c_driver(lp5523_driver);
1051 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
1052 MODULE_DESCRIPTION("LP5523 LED engine");
1053 MODULE_LICENSE("GPL");