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    Subject[PATCH 1/1] backlight: add new lm3639 backlight driver
    Date
    From: "G.Shark Jeong" <gshark.jeong@gmail.com>

    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

    Signed-off-by: G.Shark Jeong <gshark.jeong@gmail.com>
    ---
    drivers/video/backlight/Kconfig | 7 +
    drivers/video/backlight/Makefile | 1 +
    drivers/video/backlight/lm3639_bl.c | 436 +++++++++++++++++++++++++++++++
    include/linux/platform_data/lm3639_bl.h | 69 +++++
    4 files changed, 513 insertions(+), 0 deletions(-)
    create mode 100644 drivers/video/backlight/lm3639_bl.c
    create mode 100644 include/linux/platform_data/lm3639_bl.h

    diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
    index cf28276..2ed68bd 100644
    --- a/drivers/video/backlight/Kconfig
    +++ b/drivers/video/backlight/Kconfig
    @@ -352,6 +352,13 @@ config BACKLIGHT_AAT2870
    If you have a AnalogicTech AAT2870 say Y to enable the
    backlight driver.

    +config BACKLIGHT_LM3639
    + tristate "Backlight Driver for LM3639"
    + depends on BACKLIGHT_CLASS_DEVICE && I2C
    + select REGMAP_I2C
    + 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
    diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
    index a2ac9cf..c46770c 100644
    --- a/drivers/video/backlight/Makefile
    +++ b/drivers/video/backlight/Makefile
    @@ -23,6 +23,7 @@ obj-$(CONFIG_BACKLIGHT_HP700) += jornada720_bl.o
    obj-$(CONFIG_BACKLIGHT_HP680) += hp680_bl.o
    obj-$(CONFIG_BACKLIGHT_LM3533) += lm3533_bl.o
    obj-$(CONFIG_BACKLIGHT_LOCOMO) += locomolcd.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
    diff --git a/drivers/video/backlight/lm3639_bl.c b/drivers/video/backlight/lm3639_bl.c
    new file mode 100644
    index 0000000..d143e43
    --- /dev/null
    +++ b/drivers/video/backlight/lm3639_bl.c
    @@ -0,0 +1,436 @@
    +/*
    +* 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 =
    + 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 =
    + 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");
    diff --git a/include/linux/platform_data/lm3639_bl.h b/include/linux/platform_data/lm3639_bl.h
    new file mode 100644
    index 0000000..5234cd5
    --- /dev/null
    +++ b/include/linux/platform_data/lm3639_bl.h
    @@ -0,0 +1,69 @@
    +/*
    +* 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 */
    --
    1.7.5.4


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