Commit 0f59858d authored by G.Shark Jeong's avatar G.Shark Jeong Committed by Linus Torvalds
Browse files

backlight: add new lm3639 backlight driver 



This driver is a general version for LM3639 backlgiht + flash driver chip
of TI.

LM3639:
The LM3639 is a single chip LCD Display Backlight driver + white LED
Camera driver.  Programming is done over an I2C compatible interface.
www.ti.com

[akpm@linux-foundation.org: code layout tweaks]
Signed-off-by: default avatarG.Shark Jeong <gshark.jeong@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Daniel Jeong <daniel.jeong@ti.com>
Cc: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 0c2a665a

drivers/video/backlight/Kconfig

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Original line number Diff line number Diff line
@@ -359,6 +359,15 @@ config BACKLIGHT_LM3630 
	help

	  This supports TI LM3630 Backlight Driver



config BACKLIGHT_LM3639

	tristate "Backlight Driver for LM3639"

	depends on BACKLIGHT_CLASS_DEVICE && I2C

	select REGMAP_I2C

	select NEW_LEDS

	select LEDS_CLASS

	help

	  This supports TI LM3639 Backlight + 1.5A Flash LED Driver



config BACKLIGHT_LP855X

	tristate "Backlight driver for TI LP855X"

	depends on BACKLIGHT_CLASS_DEVICE && I2C

drivers/video/backlight/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ obj-$(CONFIG_BACKLIGHT_HP680) += hp680_bl.o 
obj-$(CONFIG_BACKLIGHT_LM3533)	+= lm3533_bl.o

obj-$(CONFIG_BACKLIGHT_LOCOMO)	+= locomolcd.o

obj-$(CONFIG_BACKLIGHT_LM3630)	+= lm3630_bl.o

obj-$(CONFIG_BACKLIGHT_LM3639)	+= lm3639_bl.o

obj-$(CONFIG_BACKLIGHT_LP855X)	+= lp855x_bl.o

obj-$(CONFIG_BACKLIGHT_OMAP1)	+= omap1_bl.o

obj-$(CONFIG_BACKLIGHT_PANDORA)	+= pandora_bl.o

drivers/video/backlight/lm3639_bl.c

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/*

* Simple driver for Texas Instruments LM3639 Backlight + Flash LED driver chip

* Copyright (C) 2012 Texas Instruments

*

* 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.

*

*/

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/i2c.h>

#include <linux/leds.h>

#include <linux/backlight.h>

#include <linux/err.h>

#include <linux/delay.h>

#include <linux/uaccess.h>

#include <linux/interrupt.h>

#include <linux/regmap.h>

#include <linux/platform_data/lm3639_bl.h>



#define REG_DEV_ID	0x00

#define REG_CHECKSUM	0x01

#define REG_BL_CONF_1	0x02

#define REG_BL_CONF_2	0x03

#define REG_BL_CONF_3	0x04

#define REG_BL_CONF_4	0x05

#define REG_FL_CONF_1	0x06

#define REG_FL_CONF_2	0x07

#define REG_FL_CONF_3	0x08

#define REG_IO_CTRL	0x09

#define REG_ENABLE	0x0A

#define REG_FLAG	0x0B

#define REG_MAX		REG_FLAG



struct lm3639_chip_data {

	struct device *dev;

	struct lm3639_platform_data *pdata;



	struct backlight_device *bled;

	struct led_classdev cdev_flash;

	struct led_classdev cdev_torch;

	struct regmap *regmap;



	unsigned int bled_mode;

	unsigned int bled_map;

	unsigned int last_flag;

};



/* initialize chip */

static int __devinit lm3639_chip_init(struct lm3639_chip_data *pchip)

{

	int ret;

	unsigned int reg_val;

	struct lm3639_platform_data *pdata = pchip->pdata;



	/* input pins config. */

	ret =

	    regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x08,

			       pdata->pin_pwm);

	if (ret < 0)

		goto out;



	reg_val = (pdata->pin_pwm & 0x40) | pdata->pin_strobe | pdata->pin_tx;

	ret = regmap_update_bits(pchip->regmap, REG_IO_CTRL, 0x7C, reg_val);

	if (ret < 0)

		goto out;



	/* init brightness */

	ret = regmap_write(pchip->regmap, REG_BL_CONF_4, pdata->init_brt_led);

	if (ret < 0)

		goto out;



	ret = regmap_write(pchip->regmap, REG_BL_CONF_3, pdata->init_brt_led);

	if (ret < 0)

		goto out;



	/* output pins config. */

	if (!pdata->init_brt_led)

		reg_val = pdata->fled_pins | pdata->bled_pins;

	else

		reg_val = pdata->fled_pins | pdata->bled_pins | 0x01;



	ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x79, reg_val);

	if (ret < 0)

		goto out;



	return ret;

out:

	dev_err(pchip->dev, "i2c failed to access register\n");

	return ret;

}



/* update and get brightness */

static int lm3639_bled_update_status(struct backlight_device *bl)

{

	int ret;

	unsigned int reg_val;

	struct lm3639_chip_data *pchip = bl_get_data(bl);

	struct lm3639_platform_data *pdata = pchip->pdata;



	ret = regmap_read(pchip->regmap, REG_FLAG, &reg_val);

	if (ret < 0)

		goto out;



	if (reg_val != 0)

		dev_info(pchip->dev, "last flag is 0x%x\n", reg_val);



	/* pwm control */

	if (pdata->pin_pwm) {

		if (pdata->pwm_set_intensity)

			pdata->pwm_set_intensity(bl->props.brightness,

						 pdata->max_brt_led);

		else

			dev_err(pchip->dev,

				"No pwm control func. in plat-data\n");

		return bl->props.brightness;

	}



	/* i2c control and set brigtness */

	ret = regmap_write(pchip->regmap, REG_BL_CONF_4, bl->props.brightness);

	if (ret < 0)

		goto out;

	ret = regmap_write(pchip->regmap, REG_BL_CONF_3, bl->props.brightness);

	if (ret < 0)

		goto out;



	if (!bl->props.brightness)

		ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x01, 0x00);

	else

		ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x01, 0x01);

	if (ret < 0)

		goto out;



	return bl->props.brightness;

out:

	dev_err(pchip->dev, "i2c failed to access registers\n");

	return bl->props.brightness;

}



static int lm3639_bled_get_brightness(struct backlight_device *bl)

{

	int ret;

	unsigned int reg_val;

	struct lm3639_chip_data *pchip = bl_get_data(bl);

	struct lm3639_platform_data *pdata = pchip->pdata;



	if (pdata->pin_pwm) {

		if (pdata->pwm_get_intensity)

			bl->props.brightness = pdata->pwm_get_intensity();

		else

			dev_err(pchip->dev,

				"No pwm control func. in plat-data\n");

		return bl->props.brightness;

	}



	ret = regmap_read(pchip->regmap, REG_BL_CONF_1, &reg_val);

	if (ret < 0)

		goto out;

	if (reg_val & 0x10)

		ret = regmap_read(pchip->regmap, REG_BL_CONF_4, &reg_val);

	else

		ret = regmap_read(pchip->regmap, REG_BL_CONF_3, &reg_val);

	if (ret < 0)

		goto out;

	bl->props.brightness = reg_val;



	return bl->props.brightness;

out:

	dev_err(pchip->dev, "i2c failed to access register\n");

	return bl->props.brightness;

}



static const struct backlight_ops lm3639_bled_ops = {

	.options = BL_CORE_SUSPENDRESUME,

	.update_status = lm3639_bled_update_status,

	.get_brightness = lm3639_bled_get_brightness,

};



/* backlight mapping mode */

static ssize_t lm3639_bled_mode_store(struct device *dev,

				      struct device_attribute *devAttr,

				      const char *buf, size_t size)

{

	ssize_t ret;

	struct lm3639_chip_data *pchip = dev_get_drvdata(dev);

	unsigned int state;



	ret = kstrtouint(buf, 10, &state);

	if (ret)

		goto out_input;



	if (!state)

		ret =

		    regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x10,

				       0x00);

	else

		ret =

		    regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x10,

				       0x10);



	if (ret < 0)

		goto out;



	return size;



out:

	dev_err(pchip->dev, "%s:i2c access fail to register\n", __func__);

	return size;



out_input:

	dev_err(pchip->dev, "%s:input conversion fail\n", __func__);

	return size;



}



static DEVICE_ATTR(bled_mode, 0666, NULL, lm3639_bled_mode_store);



/* torch */

static void lm3639_torch_brightness_set(struct led_classdev *cdev,

					enum led_brightness brightness)

{

	int ret;

	unsigned int reg_val;

	struct lm3639_chip_data *pchip;



	pchip = container_of(cdev, struct lm3639_chip_data, cdev_torch);



	ret = regmap_read(pchip->regmap, REG_FLAG, &reg_val);

	if (ret < 0)

		goto out;

	if (reg_val != 0)

		dev_info(pchip->dev, "last flag is 0x%x\n", reg_val);



	/* brightness 0 means off state */

	if (!brightness) {

		ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x00);

		if (ret < 0)

			goto out;

		return;

	}



	ret = regmap_update_bits(pchip->regmap,

				 REG_FL_CONF_1, 0x70, (brightness - 1) << 4);

	if (ret < 0)

		goto out;

	ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x02);

	if (ret < 0)

		goto out;



	return;

out:

	dev_err(pchip->dev, "i2c failed to access register\n");

	return;

}



/* flash */

static void lm3639_flash_brightness_set(struct led_classdev *cdev,

					enum led_brightness brightness)

{

	int ret;

	unsigned int reg_val;

	struct lm3639_chip_data *pchip;



	pchip = container_of(cdev, struct lm3639_chip_data, cdev_flash);



	ret = regmap_read(pchip->regmap, REG_FLAG, &reg_val);

	if (ret < 0)

		goto out;

	if (reg_val != 0)

		dev_info(pchip->dev, "last flag is 0x%x\n", reg_val);



	/* torch off before flash control */

	ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x00);

	if (ret < 0)

		goto out;



	/* brightness 0 means off state */

	if (!brightness)

		return;



	ret = regmap_update_bits(pchip->regmap,

				 REG_FL_CONF_1, 0x0F, brightness - 1);

	if (ret < 0)

		goto out;

	ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x06);

	if (ret < 0)

		goto out;



	return;

out:

	dev_err(pchip->dev, "i2c failed to access register\n");

	return;

}



static const struct regmap_config lm3639_regmap = {

	.reg_bits = 8,

	.val_bits = 8,

	.max_register = REG_MAX,

};



static int __devinit lm3639_probe(struct i2c_client *client,

				  const struct i2c_device_id *id)

{

	int ret;

	struct lm3639_chip_data *pchip;

	struct lm3639_platform_data *pdata = client->dev.platform_data;

	struct backlight_properties props;



	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {

		dev_err(&client->dev, "i2c functionality check fail.\n");

		return -EOPNOTSUPP;

	}



	if (pdata == NULL) {

		dev_err(&client->dev, "Needs Platform Data.\n");

		return -ENODATA;

	}



	pchip = devm_kzalloc(&client->dev,

			     sizeof(struct lm3639_chip_data), GFP_KERNEL);

	if (!pchip)

		return -ENOMEM;



	pchip->pdata = pdata;

	pchip->dev = &client->dev;



	pchip->regmap = devm_regmap_init_i2c(client, &lm3639_regmap);

	if (IS_ERR(pchip->regmap)) {

		ret = PTR_ERR(pchip->regmap);

		dev_err(&client->dev, "fail : allocate register map: %d\n",

			ret);

		return ret;

	}

	i2c_set_clientdata(client, pchip);



	/* chip initialize */

	ret = lm3639_chip_init(pchip);

	if (ret < 0) {

		dev_err(&client->dev, "fail : chip init\n");

		goto err_out;

	}



	/* backlight */

	props.type = BACKLIGHT_RAW;

	props.brightness = pdata->init_brt_led;

	props.max_brightness = pdata->max_brt_led;

	pchip->bled =

	    backlight_device_register("lm3639_bled", pchip->dev, pchip,

				      &lm3639_bled_ops, &props);

	if (IS_ERR(pchip->bled)) {

		dev_err(&client->dev, "fail : backlight register\n");

		ret = -EIO;

		goto err_out;

	}



	ret = device_create_file(&(pchip->bled->dev), &dev_attr_bled_mode);

	if (ret < 0) {

		dev_err(&client->dev, "failed : add sysfs entries\n");

		ret = -EIO;

		goto err_bled_mode;

	}



	/* flash */

	pchip->cdev_flash.name = "lm3639_flash";

	pchip->cdev_flash.max_brightness = 16;

	pchip->cdev_flash.brightness_set = lm3639_flash_brightness_set;

	ret = led_classdev_register((struct device *)

				    &client->dev, &pchip->cdev_flash);

	if (ret < 0) {

		dev_err(&client->dev, "fail : flash register\n");

		ret = -EIO;

		goto err_flash;

	}



	/* torch */

	pchip->cdev_torch.name = "lm3639_torch";

	pchip->cdev_torch.max_brightness = 8;

	pchip->cdev_torch.brightness_set = lm3639_torch_brightness_set;

	ret = led_classdev_register((struct device *)

				    &client->dev, &pchip->cdev_torch);

	if (ret < 0) {

		dev_err(&client->dev, "fail : torch register\n");

		ret = -EIO;

		goto err_torch;

	}



	return 0;



err_torch:

	led_classdev_unregister(&pchip->cdev_flash);

err_flash:

	device_remove_file(&(pchip->bled->dev), &dev_attr_bled_mode);

err_bled_mode:

	backlight_device_unregister(pchip->bled);

err_out:

	return ret;

}



static int __devexit lm3639_remove(struct i2c_client *client)

{

	struct lm3639_chip_data *pchip = i2c_get_clientdata(client);



	regmap_write(pchip->regmap, REG_ENABLE, 0x00);



	if (&pchip->cdev_torch)

		led_classdev_unregister(&pchip->cdev_torch);

	if (&pchip->cdev_flash)

		led_classdev_unregister(&pchip->cdev_flash);

	if (pchip->bled) {

		device_remove_file(&(pchip->bled->dev), &dev_attr_bled_mode);

		backlight_device_unregister(pchip->bled);

	}

	return 0;

}



static const struct i2c_device_id lm3639_id[] = {

	{LM3639_NAME, 0},

	{}

};



MODULE_DEVICE_TABLE(i2c, lm3639_id);

static struct i2c_driver lm3639_i2c_driver = {

	.driver = {

		   .name = LM3639_NAME,

		   },

	.probe = lm3639_probe,

	.remove = __devexit_p(lm3639_remove),

	.id_table = lm3639_id,

};



module_i2c_driver(lm3639_i2c_driver);



MODULE_DESCRIPTION("Texas Instruments Backlight+Flash LED driver for LM3639");

MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");

MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");

MODULE_LICENSE("GPL v2");

include/linux/platform_data/lm3639_bl.h

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/*

* Simple driver for Texas Instruments LM3630 LED Flash driver chip

* Copyright (C) 2012 Texas Instruments

*

* 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.

*

*/



#ifndef __LINUX_LM3639_H

#define __LINUX_LM3639_H



#define LM3639_NAME "lm3639_bl"



enum lm3639_pwm {

	LM3639_PWM_DISABLE = 0x00,

	LM3639_PWM_EN_ACTLOW = 0x48,

	LM3639_PWM_EN_ACTHIGH = 0x40,

};



enum lm3639_strobe {

	LM3639_STROBE_DISABLE = 0x00,

	LM3639_STROBE_EN_ACTLOW = 0x10,

	LM3639_STROBE_EN_ACTHIGH = 0x30,

};



enum lm3639_txpin {

	LM3639_TXPIN_DISABLE = 0x00,

	LM3639_TXPIN_EN_ACTLOW = 0x04,

	LM3639_TXPIN_EN_ACTHIGH = 0x0C,

};



enum lm3639_fleds {

	LM3639_FLED_DIASBLE_ALL = 0x00,

	LM3639_FLED_EN_1 = 0x40,

	LM3639_FLED_EN_2 = 0x20,

	LM3639_FLED_EN_ALL = 0x60,

};



enum lm3639_bleds {

	LM3639_BLED_DIASBLE_ALL = 0x00,

	LM3639_BLED_EN_1 = 0x10,

	LM3639_BLED_EN_2 = 0x08,

	LM3639_BLED_EN_ALL = 0x18,

};

enum lm3639_bled_mode {

	LM3639_BLED_MODE_EXPONETIAL = 0x00,

	LM3639_BLED_MODE_LINEAR = 0x10,

};



struct lm3639_platform_data {

	unsigned int max_brt_led;

	unsigned int init_brt_led;



	/* input pins */

	enum lm3639_pwm pin_pwm;

	enum lm3639_strobe pin_strobe;

	enum lm3639_txpin pin_tx;



	/* output pins */

	enum lm3639_fleds fled_pins;

	enum lm3639_bleds bled_pins;

	enum lm3639_bled_mode bled_mode;



	void (*pwm_set_intensity) (int brightness, int max_brightness);

	int (*pwm_get_intensity) (void);

};

#endif /* __LINUX_LM3639_H */

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