Linux/LP5569: Linux device driver for LP5569

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 7a628c6..e651933 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -243,8 +243,8 @@ config LEDS_LP3952
 	  module will be called leds-lp3952.
 
 config LEDS_LP55XX_COMMON
-	tristate "Common Driver for TI/National LP5521/5523/55231/5562/8501"
-	depends on LEDS_LP5521 || LEDS_LP5523 || LEDS_LP5562 || LEDS_LP8501
+	tristate "Common Driver for TI/National LP5521/5523/55231/5562/5569/8501"
+	depends on LEDS_LP5521 || LEDS_LP5523 || LEDS_LP5562 || LEDS_LP5569 || LEDS_LP8501
 	select FW_LOADER
 	select FW_LOADER_USER_HELPER
 	help
@@ -282,6 +282,16 @@ config LEDS_LP5562
 	  Driver provides direct control via LED class and interface for
 	  programming the engines.
 
+config LEDS_LP5569
+	tristate "LED Support for TI LP5569 LED driver chip"
+	depends on LEDS_CLASS && I2C
+	select LEDS_LP55XX_COMMON
+	help
+	  If you say yes here you get support for TI LP5569 LED driver.
+	  It is 4 channels chip with programmable engines.
+	  Driver provides direct control via LED class and interface for
+	  programming the engines.
+
 config LEDS_LP8501
 	tristate "LED Support for TI LP8501 LED driver chip"
 	depends on LEDS_CLASS && I2C
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 3965070..14f0aec 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_LEDS_LP55XX_COMMON)	+= leds-lp55xx-common.o
 obj-$(CONFIG_LEDS_LP5521)		+= leds-lp5521.o
 obj-$(CONFIG_LEDS_LP5523)		+= leds-lp5523.o
 obj-$(CONFIG_LEDS_LP5562)		+= leds-lp5562.o
+obj-$(CONFIG_LEDS_LP5569)		+= leds-lp5569.o
 obj-$(CONFIG_LEDS_LP8501)		+= leds-lp8501.o
 obj-$(CONFIG_LEDS_LP8788)		+= leds-lp8788.o
 obj-$(CONFIG_LEDS_LP8860)		+= leds-lp8860.o
diff --git a/drivers/leds/leds-lp5569.c b/drivers/leds/leds-lp5569.c
new file mode 100755
index 0000000..43d450c
--- /dev/null
+++ b/drivers/leds/leds-lp5569.c
@@ -0,0 +1,995 @@
+/*
+ * lp5569.c - LP5569LED Driver
+ *
+ * Copyright (C) 2010 Nokia Corporation
+ * Copyright (C) 2012 Texas Instruments
+ *
+ * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
+ *          Milo(Woogyom) Kim <milo.kim@ti.com>
+ *          Woonyong, Yun <wyyun@humaxdigital.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/delay.h>
+#include <linux/firmware.h>
+#include <linux/i2c.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/platform_data/leds-lp55xx.h>
+#include <linux/slab.h>
+
+#include "leds-lp55xx-common.h"
+
+#define LP5569_PROGRAM_LENGTH		32	/* bytes */
+/* Memory is used like this:
+   0x00 engine 1 program
+   0x10 engine 2 program
+   0x20 engine 3 program
+   0x30 engine 1 muxing info
+   0x40 engine 2 muxing info
+   0x50 engine 3 muxing info
+*/
+#define LP5569_MAX_LEDS			9
+
+/* Registers */
+#define LP5569_REG_ENABLE		0x00	/*same*/
+#define LP5569_REG_OP_MODE		0x02	/*0x01*/
+#define LP5569_REG_ENABLE_LEDS_MSB	0x04
+#define LP5569_REG_ENABLE_LEDS_LSB	0x05
+#define LP5569_REG_LED_CTRL_BASE	0x07	/*0x06*/
+#define LP5569_REG_LED_PWM_BASE		0x16	/*same*/
+#define LP5569_REG_LED_CURRENT_BASE	0x22	/*0x26*/
+#define LP5569_REG_CONFIG		0x2F	/*0x36*/
+#define LP5569_REG_STATUS		0x3C	/*0x3A*/
+#define LP5569_REG_RESET		0x3F	/*0x3D*/
+#define LP5569_REG_LED_TEST_CTRL	0x41
+#define LP5569_REG_LED_TEST_ADC		0x42
+#define LP5569_REG_MASTER_FADER_BASE	0x46	/*0x48*/
+#define LP5569_REG_CH1_PROG_START	0x4B	/*0x4C*/
+#define LP5569_REG_CH2_PROG_START	0x4C	/*0x4D*/
+#define LP5569_REG_CH3_PROG_START	0x4D	/*0x4E*/
+#define LP5569_REG_PROG_PAGE_SEL	0x4F	/*same*/
+#define LP5569_REG_PROG_MEM		0x50	/*same*/
+
+/* Bit description in registers */
+#define LP5569_ENABLE			0x40
+#define LP5569_AUTO_INC			0x40
+#define LP5569_PWR_SAVE			0x20
+#define LP5569_PWM_PWR_SAVE		0x04
+#define LP5569_CP_AUTO			0x18
+#define LP5569_AUTO_CLK			0x02
+#define LP5569_INTERNAL_CLK		0x01
+
+#define LP5569_EN_LEDTEST		0x80
+#define LP5569_LEDTEST_DONE		0x80
+#define LP5569_RESET			0xFF
+#define LP5569_ADC_SHORTCIRC_LIM	80
+#define LP5569_EXT_CLK_USED		0x08
+#define LP5569_ENG_STATUS_MASK		0x07
+
+#define LP5569_FADER_MAPPING_MASK	0xC0
+#define LP5569_FADER_MAPPING_SHIFT	6
+
+/* Memory Page Selection */
+#define LP5569_PAGE_ENG1		0
+#define LP5569_PAGE_ENG2		1
+#define LP5569_PAGE_ENG3		2
+#define LP5569_PAGE_MUX1		3
+#define LP5569_PAGE_MUX2		4
+#define LP5569_PAGE_MUX3		5
+
+/* Program Memory Operations */
+#define LP5569_MODE_ENG1_M		0x30	/* Operation Mode Register */
+#define LP5569_MODE_ENG2_M		0x0C
+#define LP5569_MODE_ENG3_M		0x03
+#define LP5569_LOAD_ENG1		0x10
+#define LP5569_LOAD_ENG2		0x04
+#define LP5569_LOAD_ENG3		0x01
+
+#define LP5569_ENG1_IS_LOADING(mode)	\
+	((mode & LP5569_MODE_ENG1_M) == LP5569_LOAD_ENG1)
+#define LP5569_ENG2_IS_LOADING(mode)	\
+	((mode & LP5569_MODE_ENG2_M) == LP5569_LOAD_ENG2)
+#define LP5569_ENG3_IS_LOADING(mode)	\
+	((mode & LP5569_MODE_ENG3_M) == LP5569_LOAD_ENG3)
+
+#define LP5569_EXEC_ENG1_M		0x30	/* Enable Register */
+#define LP5569_EXEC_ENG2_M		0x0C
+#define LP5569_EXEC_ENG3_M		0x03
+#define LP5569_EXEC_M			0x3F
+#define LP5569_RUN_ENG1			0x20
+#define LP5569_RUN_ENG2			0x08
+#define LP5569_RUN_ENG3			0x02
+
+#define LED_ACTIVE(mux, led)		(!!(mux & (0x0001 << led)))
+
+enum lp5569_chip_id {
+	LP5569,
+};
+#if 0
+static int lp5569_init_program_engine(struct lp55xx_chip *chip);
+#endif
+static inline void lp5569_wait_opmode_done(void)
+{
+	usleep_range(1000, 2000);
+}
+
+static void lp5569_set_led_current(struct lp55xx_led *led, u8 led_current)
+{
+	led->led_current = led_current;
+	lp55xx_write(led->chip, LP5569_REG_LED_CURRENT_BASE + led->chan_nr,
+		led_current);
+}
+
+static int lp5569_post_init_device(struct lp55xx_chip *chip)
+{
+	int ret;
+
+	/* MISC.int_clk_en bit is STATIC and should only be changed when CONFIG.CHIP_EN = 0 */
+	/* Set internal clock here */
+	ret = lp55xx_write(chip, LP5569_REG_CONFIG, LP5569_INTERNAL_CLK);
+
+	/* then enable en_bit */
+	ret = lp55xx_write(chip, LP5569_REG_ENABLE, LP5569_ENABLE);
+	if (ret)
+		return ret;
+
+	/* Chip startup time is 500 us, 1 - 2 ms gives some margin */
+	usleep_range(1000, 2000);
+
+	ret = lp55xx_write(chip, LP5569_REG_CONFIG,
+			    LP5569_AUTO_INC | LP5569_PWR_SAVE |
+			    LP5569_CP_AUTO | LP5569_INTERNAL_CLK |
+			    LP5569_PWM_PWR_SAVE);
+	if (ret)
+		return ret;
+
+#if 0
+	/* turn on all leds */
+	ret = lp55xx_write(chip, LP5569_REG_ENABLE_LEDS_MSB, 0x01);
+	if (ret)
+		return ret;
+
+	ret = lp55xx_write(chip, LP5569_REG_ENABLE_LEDS_LSB, 0xff);
+	if (ret)
+		return ret;
+	return lp5569_init_program_engine(chip);
+#else
+	return 0;
+#endif
+}
+
+static void lp5569_load_engine(struct lp55xx_chip *chip)
+{
+	enum lp55xx_engine_index idx = chip->engine_idx;
+	u8 mask[] = {
+		[LP55XX_ENGINE_1] = LP5569_MODE_ENG1_M,
+		[LP55XX_ENGINE_2] = LP5569_MODE_ENG2_M,
+		[LP55XX_ENGINE_3] = LP5569_MODE_ENG3_M,
+	};
+
+	u8 val[] = {
+		[LP55XX_ENGINE_1] = LP5569_LOAD_ENG1,
+		[LP55XX_ENGINE_2] = LP5569_LOAD_ENG2,
+		[LP55XX_ENGINE_3] = LP5569_LOAD_ENG3,
+	};
+
+	lp55xx_update_bits(chip, LP5569_REG_OP_MODE, mask[idx], val[idx]);
+
+	lp5569_wait_opmode_done();
+}
+
+static void lp5569_load_engine_and_select_page(struct lp55xx_chip *chip)
+{
+	enum lp55xx_engine_index idx = chip->engine_idx;
+	u8 page_sel[] = {
+		[LP55XX_ENGINE_1] = LP5569_PAGE_ENG1,
+		[LP55XX_ENGINE_2] = LP5569_PAGE_ENG2,
+		[LP55XX_ENGINE_3] = LP5569_PAGE_ENG3,
+	};
+
+	lp5569_load_engine(chip);
+
+	lp55xx_write(chip, LP5569_REG_PROG_PAGE_SEL, page_sel[idx]);
+}
+
+static void lp5569_stop_all_engines(struct lp55xx_chip *chip)
+{
+	lp55xx_write(chip, LP5569_REG_OP_MODE, 0);
+	lp5569_wait_opmode_done();
+}
+
+static void lp5569_stop_engine(struct lp55xx_chip *chip)
+{
+	enum lp55xx_engine_index idx = chip->engine_idx;
+	u8 mask[] = {
+		[LP55XX_ENGINE_1] = LP5569_MODE_ENG1_M,
+		[LP55XX_ENGINE_2] = LP5569_MODE_ENG2_M,
+		[LP55XX_ENGINE_3] = LP5569_MODE_ENG3_M,
+	};
+
+	lp55xx_update_bits(chip, LP5569_REG_OP_MODE, mask[idx], 0);
+
+	lp5569_wait_opmode_done();
+}
+
+static void lp5569_turn_off_channels(struct lp55xx_chip *chip)
+{
+	int i;
+
+	for (i = 0; i < LP5569_MAX_LEDS; i++)
+		lp55xx_write(chip, LP5569_REG_LED_PWM_BASE + i, 0);
+}
+
+static void lp5569_run_engine(struct lp55xx_chip *chip, bool start)
+{
+	int ret;
+	u8 mode;
+	u8 exec;
+
+	/* stop engine */
+	if (!start) {
+		lp5569_stop_engine(chip);
+		lp5569_turn_off_channels(chip);
+		return;
+	}
+
+	/*
+	 * To run the engine,
+	 * operation mode and enable register should updated at the same time
+	 */
+
+	ret = lp55xx_read(chip, LP5569_REG_OP_MODE, &mode);
+	if (ret)
+		return;
+
+	ret = lp55xx_read(chip, LP5569_REG_ENABLE, &exec);
+	if (ret)
+		return;
+
+	/* change operation mode to RUN only when each engine is loading */
+	if (LP5569_ENG1_IS_LOADING(mode)) {
+		mode = (mode & ~LP5569_MODE_ENG1_M) | LP5569_RUN_ENG1;
+		exec = (exec & ~LP5569_EXEC_ENG1_M) | LP5569_RUN_ENG1;
+	}
+
+	if (LP5569_ENG2_IS_LOADING(mode)) {
+		mode = (mode & ~LP5569_MODE_ENG2_M) | LP5569_RUN_ENG2;
+		exec = (exec & ~LP5569_EXEC_ENG2_M) | LP5569_RUN_ENG2;
+	}
+
+	if (LP5569_ENG3_IS_LOADING(mode)) {
+		mode = (mode & ~LP5569_MODE_ENG3_M) | LP5569_RUN_ENG3;
+		exec = (exec & ~LP5569_EXEC_ENG3_M) | LP5569_RUN_ENG3;
+	}
+
+	lp55xx_write(chip, LP5569_REG_OP_MODE, mode);
+	lp5569_wait_opmode_done();
+
+	lp55xx_update_bits(chip, LP5569_REG_ENABLE, LP5569_EXEC_M, exec);
+}
+#if 0
+static int lp5569_init_program_engine(struct lp55xx_chip *chip)
+{
+	int i;
+	int j;
+	int ret;
+	u8 status;
+	/* one pattern per engine setting LED MUX start and stop addresses */
+	static const u8 pattern[][LP5569_PROGRAM_LENGTH] =  {
+		{ 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
+		{ 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
+		{ 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
+	};
+
+	/* hardcode 32 bytes of memory for each engine from program memory */
+	ret = lp55xx_write(chip, LP5569_REG_CH1_PROG_START, 0x00);
+	if (ret)
+		return ret;
+
+	ret = lp55xx_write(chip, LP5569_REG_CH2_PROG_START, 0x10);
+	if (ret)
+		return ret;
+
+	ret = lp55xx_write(chip, LP5569_REG_CH3_PROG_START, 0x20);
+	if (ret)
+		return ret;
+
+	/* write LED MUX address space for each engine */
+	for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) {
+		chip->engine_idx = i;
+		lp5569_load_engine_and_select_page(chip);
+
+		for (j = 0; j < LP5569_PROGRAM_LENGTH; j++) {
+			ret = lp55xx_write(chip, LP5569_REG_PROG_MEM + j,
+					pattern[i - 1][j]);
+			if (ret)
+				goto out;
+		}
+	}
+
+	lp5569_run_engine(chip, true);
+
+	/* Let the programs run for couple of ms and check the engine status */
+	usleep_range(3000, 6000);
+	lp55xx_read(chip, LP5569_REG_STATUS, &status);
+	status &= LP5569_ENG_STATUS_MASK;
+
+	if (status != LP5569_ENG_STATUS_MASK) {
+		dev_err(&chip->cl->dev,
+			"could not configure LED engine, status = 0x%.2x\n",
+			status);
+		ret = -1;
+	}
+
+out:
+	lp5569_stop_all_engines(chip);
+	return ret;
+}
+#endif
+static int lp5569_update_program_memory(struct lp55xx_chip *chip,
+					const u8 *data, size_t size)
+{
+	u8 pattern[LP5569_PROGRAM_LENGTH] = {0};
+	unsigned cmd;
+	char c[3];
+	int nrchars;
+	int ret;
+	int offset = 0;
+	int i = 0;
+
+	while ((offset < size - 1) && (i < LP5569_PROGRAM_LENGTH)) {
+		/* separate sscanfs because length is working only for %s */
+		ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
+		if (ret != 1)
+			goto err;
+
+		ret = sscanf(c, "%2x", &cmd);
+		if (ret != 1)
+			goto err;
+
+		pattern[i] = (u8)cmd;
+		offset += nrchars;
+		i++;
+	}
+
+	/* Each instruction is 16bit long. Check that length is even */
+	if (i % 2)
+		goto err;
+
+	for (i = 0; i < LP5569_PROGRAM_LENGTH; i++) {
+		ret = lp55xx_write(chip, LP5569_REG_PROG_MEM + i, pattern[i]);
+		if (ret)
+			return -EINVAL;
+	}
+
+	return size;
+
+err:
+	dev_err(&chip->cl->dev, "wrong pattern format\n");
+	return -EINVAL;
+}
+
+static void lp5569_firmware_loaded(struct lp55xx_chip *chip)
+{
+	const struct firmware *fw = chip->fw;
+
+	if (fw->size > LP5569_PROGRAM_LENGTH) {
+		dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
+			fw->size);
+		return;
+	}
+
+	/*
+	 * Program momery sequence
+	 *  1) set engine mode to "LOAD"
+	 *  2) write firmware data into program memory
+	 */
+
+	lp5569_load_engine_and_select_page(chip);
+	lp5569_update_program_memory(chip, fw->data, fw->size);
+}
+
+static ssize_t show_engine_mode(struct device *dev,
+				struct device_attribute *attr,
+				char *buf, int nr)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode;
+
+	switch (mode) {
+	case LP55XX_ENGINE_RUN:
+		return sprintf(buf, "run\n");
+	case LP55XX_ENGINE_LOAD:
+		return sprintf(buf, "load\n");
+	case LP55XX_ENGINE_DISABLED:
+	default:
+		return sprintf(buf, "disabled\n");
+	}
+}
+show_mode(1)
+show_mode(2)
+show_mode(3)
+
+static ssize_t store_engine_mode(struct device *dev,
+				 struct device_attribute *attr,
+				 const char *buf, size_t len, int nr)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	struct lp55xx_engine *engine = &chip->engines[nr - 1];
+
+	mutex_lock(&chip->lock);
+
+	chip->engine_idx = nr;
+
+	if (!strncmp(buf, "run", 3)) {
+		lp5569_run_engine(chip, true);
+		engine->mode = LP55XX_ENGINE_RUN;
+	} else if (!strncmp(buf, "load", 4)) {
+		lp5569_stop_engine(chip);
+		lp5569_load_engine(chip);
+		engine->mode = LP55XX_ENGINE_LOAD;
+	} else if (!strncmp(buf, "disabled", 8)) {
+		lp5569_stop_engine(chip);
+		engine->mode = LP55XX_ENGINE_DISABLED;
+	}
+
+	mutex_unlock(&chip->lock);
+
+	return len;
+}
+store_mode(1)
+store_mode(2)
+store_mode(3)
+
+static int lp5569_mux_parse(const char *buf, u16 *mux, size_t len)
+{
+	u16 tmp_mux = 0;
+	int i;
+
+	len = min_t(int, len, LP5569_MAX_LEDS);
+
+	for (i = 0; i < len; i++) {
+		switch (buf[i]) {
+		case '1':
+			tmp_mux |= (1 << i);
+			break;
+		case '0':
+			break;
+		case '\n':
+			i = len;
+			break;
+		default:
+			return -1;
+		}
+	}
+	*mux = tmp_mux;
+
+	return 0;
+}
+
+static void lp5569_mux_to_array(u16 led_mux, char *array)
+{
+	int i, pos = 0;
+	for (i = 0; i < LP5569_MAX_LEDS; i++)
+		pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
+
+	array[pos] = '\0';
+}
+
+static ssize_t show_engine_leds(struct device *dev,
+			    struct device_attribute *attr,
+			    char *buf, int nr)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	char mux[LP5569_MAX_LEDS + 1];
+
+	lp5569_mux_to_array(chip->engines[nr - 1].led_mux, mux);
+
+	return sprintf(buf, "%s\n", mux);
+}
+show_leds(1)
+show_leds(2)
+show_leds(3)
+
+static int lp5569_load_mux(struct lp55xx_chip *chip, u16 mux, int nr)
+{
+	struct lp55xx_engine *engine = &chip->engines[nr - 1];
+	int ret;
+	u8 mux_page[] = {
+		[LP55XX_ENGINE_1] = LP5569_PAGE_MUX1,
+		[LP55XX_ENGINE_2] = LP5569_PAGE_MUX2,
+		[LP55XX_ENGINE_3] = LP5569_PAGE_MUX3,
+	};
+
+	lp5569_load_engine(chip);
+
+	ret = lp55xx_write(chip, LP5569_REG_PROG_PAGE_SEL, mux_page[nr]);
+	if (ret)
+		return ret;
+
+	ret = lp55xx_write(chip, LP5569_REG_PROG_MEM , (u8)(mux >> 8));
+	if (ret)
+		return ret;
+
+	ret = lp55xx_write(chip, LP5569_REG_PROG_MEM + 1, (u8)(mux));
+	if (ret)
+		return ret;
+
+	engine->led_mux = mux;
+	return 0;
+}
+
+static ssize_t store_engine_leds(struct device *dev,
+			     struct device_attribute *attr,
+			     const char *buf, size_t len, int nr)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	struct lp55xx_engine *engine = &chip->engines[nr - 1];
+	u16 mux = 0;
+	ssize_t ret;
+
+	if (lp5569_mux_parse(buf, &mux, len))
+		return -EINVAL;
+
+	mutex_lock(&chip->lock);
+
+	chip->engine_idx = nr;
+	ret = -EINVAL;
+
+	if (engine->mode != LP55XX_ENGINE_LOAD)
+		goto leave;
+
+	if (lp5569_load_mux(chip, mux, nr))
+		goto leave;
+
+	ret = len;
+leave:
+	mutex_unlock(&chip->lock);
+	return ret;
+}
+store_leds(1)
+store_leds(2)
+store_leds(3)
+
+static ssize_t store_engine_load(struct device *dev,
+			     struct device_attribute *attr,
+			     const char *buf, size_t len, int nr)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	int ret;
+
+	mutex_lock(&chip->lock);
+
+	chip->engine_idx = nr;
+	lp5569_load_engine_and_select_page(chip);
+	ret = lp5569_update_program_memory(chip, buf, len);
+
+	mutex_unlock(&chip->lock);
+
+	return ret;
+}
+store_load(1)
+store_load(2)
+store_load(3)
+
+static ssize_t lp5569_selftest(struct device *dev,
+			       struct device_attribute *attr,
+			       char *buf)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	struct lp55xx_platform_data *pdata = chip->pdata;
+	int i, ret, pos = 0;
+	u8 status, adc, vdd;
+
+	mutex_lock(&chip->lock);
+
+	ret = lp55xx_read(chip, LP5569_REG_STATUS, &status);
+	if (ret < 0)
+		goto fail;
+
+	/* Check that ext clock is really in use if requested */
+	if (pdata->clock_mode == LP55XX_CLOCK_EXT) {
+		if  ((status & LP5569_EXT_CLK_USED) == 0)
+			goto fail;
+	}
+
+	/* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
+	lp55xx_write(chip, LP5569_REG_LED_TEST_CTRL, LP5569_EN_LEDTEST | 16);
+	usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
+	ret = lp55xx_read(chip, LP5569_REG_STATUS, &status);
+	if (ret < 0)
+		goto fail;
+
+	if (!(status & LP5569_LEDTEST_DONE))
+		usleep_range(3000, 6000); /* Was not ready. Wait little bit */
+
+	ret = lp55xx_read(chip, LP5569_REG_LED_TEST_ADC, &vdd);
+	if (ret < 0)
+		goto fail;
+
+	vdd--;	/* There may be some fluctuation in measurement */
+
+	for (i = 0; i < LP5569_MAX_LEDS; i++) {
+		/* Skip non-existing channels */
+		if (pdata->led_config[i].led_current == 0)
+			continue;
+
+		/* Set default current */
+		lp55xx_write(chip, LP5569_REG_LED_CURRENT_BASE + i,
+			pdata->led_config[i].led_current);
+
+		lp55xx_write(chip, LP5569_REG_LED_PWM_BASE + i, 0xff);
+		/* let current stabilize 2 - 4ms before measurements start */
+		usleep_range(2000, 4000);
+		lp55xx_write(chip, LP5569_REG_LED_TEST_CTRL,
+			     LP5569_EN_LEDTEST | i);
+		/* ADC conversion time is 2.7 ms typically */
+		usleep_range(3000, 6000);
+		ret = lp55xx_read(chip, LP5569_REG_STATUS, &status);
+		if (ret < 0)
+			goto fail;
+
+		if (!(status & LP5569_LEDTEST_DONE))
+			usleep_range(3000, 6000);/* Was not ready. Wait. */
+
+		ret = lp55xx_read(chip, LP5569_REG_LED_TEST_ADC, &adc);
+		if (ret < 0)
+			goto fail;
+
+		if (adc >= vdd || adc < LP5569_ADC_SHORTCIRC_LIM)
+			pos += sprintf(buf + pos, "LED %d FAIL\n", i);
+
+		lp55xx_write(chip, LP5569_REG_LED_PWM_BASE + i, 0x00);
+
+		/* Restore current */
+		lp55xx_write(chip, LP5569_REG_LED_CURRENT_BASE + i,
+			led->led_current);
+		led++;
+	}
+	if (pos == 0)
+		pos = sprintf(buf, "OK\n");
+	goto release_lock;
+fail:
+	pos = sprintf(buf, "FAIL\n");
+
+release_lock:
+	mutex_unlock(&chip->lock);
+
+	return pos;
+}
+
+#define show_fader(nr)						\
+static ssize_t show_master_fader##nr(struct device *dev,	\
+			    struct device_attribute *attr,	\
+			    char *buf)				\
+{								\
+	return show_master_fader(dev, attr, buf, nr);		\
+}
+
+#define store_fader(nr)						\
+static ssize_t store_master_fader##nr(struct device *dev,	\
+			     struct device_attribute *attr,	\
+			     const char *buf, size_t len)	\
+{								\
+	return store_master_fader(dev, attr, buf, len, nr);	\
+}
+
+static ssize_t show_master_fader(struct device *dev,
+				 struct device_attribute *attr,
+				 char *buf, int nr)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	int ret;
+	u8 val;
+
+	mutex_lock(&chip->lock);
+	ret = lp55xx_read(chip, LP5569_REG_MASTER_FADER_BASE + nr - 1, &val);
+	mutex_unlock(&chip->lock);
+
+	if (ret == 0)
+		ret = sprintf(buf, "%u\n", val);
+
+	return ret;
+}
+show_fader(1)
+show_fader(2)
+show_fader(3)
+
+static ssize_t store_master_fader(struct device *dev,
+				  struct device_attribute *attr,
+				  const char *buf, size_t len, int nr)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	int ret;
+	unsigned long val;
+
+	if (kstrtoul(buf, 0, &val))
+		return -EINVAL;
+
+	if (val > 0xff)
+		return -EINVAL;
+
+	mutex_lock(&chip->lock);
+	ret = lp55xx_write(chip, LP5569_REG_MASTER_FADER_BASE + nr - 1,
+			   (u8)val);
+	mutex_unlock(&chip->lock);
+
+	if (ret == 0)
+		ret = len;
+
+	return ret;
+}
+store_fader(1)
+store_fader(2)
+store_fader(3)
+
+static ssize_t show_master_fader_leds(struct device *dev,
+				      struct device_attribute *attr,
+				      char *buf)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	int i, ret, pos = 0;
+	u8 val;
+
+	mutex_lock(&chip->lock);
+
+	for (i = 0; i < LP5569_MAX_LEDS; i++) {
+		ret = lp55xx_read(chip, LP5569_REG_LED_CTRL_BASE + i, &val);
+		if (ret)
+			goto leave;
+
+		val = (val & LP5569_FADER_MAPPING_MASK)
+			>> LP5569_FADER_MAPPING_SHIFT;
+		if (val > 3) {
+			ret = -EINVAL;
+			goto leave;
+		}
+		buf[pos++] = val + '0';
+	}
+	buf[pos++] = '\n';
+	ret = pos;
+leave:
+	mutex_unlock(&chip->lock);
+	return ret;
+}
+
+static ssize_t store_master_fader_leds(struct device *dev,
+				       struct device_attribute *attr,
+				       const char *buf, size_t len)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	int i, n, ret;
+	u8 val;
+
+	n = min_t(int, len, LP5569_MAX_LEDS);
+
+	mutex_lock(&chip->lock);
+
+	for (i = 0; i < n; i++) {
+		if (buf[i] >= '0' && buf[i] <= '3') {
+			val = (buf[i] - '0') << LP5569_FADER_MAPPING_SHIFT;
+			ret = lp55xx_update_bits(chip,
+						 LP5569_REG_LED_CTRL_BASE + i,
+						 LP5569_FADER_MAPPING_MASK,
+						 val);
+			if (ret)
+				goto leave;
+		} else {
+			ret = -EINVAL;
+			goto leave;
+		}
+	}
+	ret = len;
+leave:
+	mutex_unlock(&chip->lock);
+	return ret;
+}
+
+static int lp5569_led_brightness(struct lp55xx_led *led)
+{
+	struct lp55xx_chip *chip = led->chip;
+	int ret;
+
+	mutex_lock(&chip->lock);
+	ret = lp55xx_write(chip, LP5569_REG_LED_PWM_BASE + led->chan_nr,
+		     led->brightness);
+	mutex_unlock(&chip->lock);
+	return ret;
+}
+
+static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode);
+static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode);
+static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode);
+static LP55XX_DEV_ATTR_RW(engine1_leds, show_engine1_leds, store_engine1_leds);
+static LP55XX_DEV_ATTR_RW(engine2_leds, show_engine2_leds, store_engine2_leds);
+static LP55XX_DEV_ATTR_RW(engine3_leds, show_engine3_leds, store_engine3_leds);
+static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load);
+static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load);
+static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load);
+static LP55XX_DEV_ATTR_RO(selftest, lp5569_selftest);
+static LP55XX_DEV_ATTR_RW(master_fader1, show_master_fader1,
+			  store_master_fader1);
+static LP55XX_DEV_ATTR_RW(master_fader2, show_master_fader2,
+			  store_master_fader2);
+static LP55XX_DEV_ATTR_RW(master_fader3, show_master_fader3,
+			  store_master_fader3);
+static LP55XX_DEV_ATTR_RW(master_fader_leds, show_master_fader_leds,
+			  store_master_fader_leds);
+
+static struct attribute *lp5569_attributes[] = {
+	&dev_attr_engine1_mode.attr,
+	&dev_attr_engine2_mode.attr,
+	&dev_attr_engine3_mode.attr,
+	&dev_attr_engine1_load.attr,
+	&dev_attr_engine2_load.attr,
+	&dev_attr_engine3_load.attr,
+	&dev_attr_engine1_leds.attr,
+	&dev_attr_engine2_leds.attr,
+	&dev_attr_engine3_leds.attr,
+	&dev_attr_selftest.attr,
+	&dev_attr_master_fader1.attr,
+	&dev_attr_master_fader2.attr,
+	&dev_attr_master_fader3.attr,
+	&dev_attr_master_fader_leds.attr,
+	NULL,
+};
+
+static const struct attribute_group lp5569_group = {
+	.attrs = lp5569_attributes,
+};
+
+/* Chip specific configurations */
+static struct lp55xx_device_config lp5569_cfg = {
+	.reset = {
+		.addr = LP5569_REG_RESET,
+		.val  = LP5569_RESET,
+	},
+	.enable = {
+		.addr = LP5569_REG_ENABLE,
+		.val  = LP5569_ENABLE,
+	},
+	.max_channel  = LP5569_MAX_LEDS,
+	.post_init_device   = lp5569_post_init_device,
+	.brightness_fn      = lp5569_led_brightness,
+	.set_led_current    = lp5569_set_led_current,
+	.firmware_cb        = lp5569_firmware_loaded,
+	.run_engine         = lp5569_run_engine,
+	.dev_attr_group     = &lp5569_group,
+};
+
+static int lp5569_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	int ret;
+	struct lp55xx_chip *chip;
+	struct lp55xx_led *led;
+	struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev);
+	struct device_node *np = client->dev.of_node;
+
+	if (!pdata) {
+		if (np) {
+			pdata = lp55xx_of_populate_pdata(&client->dev, np);
+			if (IS_ERR(pdata))
+				return PTR_ERR(pdata);
+		} else {
+			dev_err(&client->dev, "no platform data\n");
+			return -EINVAL;
+		}
+	}
+
+	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	led = devm_kzalloc(&client->dev,
+			sizeof(*led) * pdata->num_channels, GFP_KERNEL);
+	if (!led)
+		return -ENOMEM;
+
+	chip->cl = client;
+	chip->pdata = pdata;
+	chip->cfg = &lp5569_cfg;
+
+	mutex_init(&chip->lock);
+
+	i2c_set_clientdata(client, led);
+
+	ret = lp55xx_init_device(chip);
+	if (ret)
+		goto err_init;
+
+	dev_info(&client->dev, "%s Programmable led chip found\n", id->name);
+
+	ret = lp55xx_register_leds(led, chip);
+	if (ret)
+		goto err_register_leds;
+
+	ret = lp55xx_register_sysfs(chip);
+	if (ret) {
+		dev_err(&client->dev, "registering sysfs failed\n");
+		goto err_register_sysfs;
+	}
+
+	return 0;
+
+err_register_sysfs:
+	lp55xx_unregister_leds(led, chip);
+err_register_leds:
+	lp55xx_deinit_device(chip);
+err_init:
+	return ret;
+}
+
+static int lp5569_remove(struct i2c_client *client)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(client);
+	struct lp55xx_chip *chip = led->chip;
+
+	lp5569_stop_all_engines(chip);
+	lp55xx_unregister_sysfs(chip);
+	lp55xx_unregister_leds(led, chip);
+	lp55xx_deinit_device(chip);
+
+	return 0;
+}
+
+static const struct i2c_device_id lp5569_id[] = {
+	{ "lp5569",  LP5569 },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(i2c, lp5569_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id of_lp5569_leds_match[] = {
+	{ .compatible = "national,lp5569", },
+	{ .compatible = "ti,lp5569", },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, of_lp5569_leds_match);
+#endif
+
+static struct i2c_driver lp5569_driver = {
+	.driver = {
+		.name	= "lp5569x",
+		.of_match_table = of_match_ptr(of_lp5569_leds_match),
+	},
+	.probe		= lp5569_probe,
+	.remove		= lp5569_remove,
+	.id_table	= lp5569_id,
+};
+
+module_i2c_driver(lp5569_driver);
+
+MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
+MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
+MODULE_AUTHOR("Woonyong Yun <wyyun@humaxdigital.com>");
+MODULE_DESCRIPTION("LP5569 LED engine");
+MODULE_LICENSE("GPL");