linux-imx

/*

 *  LCD / Backlight control code for Sharp SL-6000x (tosa)

 *

 *  Copyright (c) 2005      Dirk Opfer

 *  Copyright (c) 2007,2008 Dmitry Baryshkov

 *

 *  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/kernel.h>

#include <linux/module.h>

#include <linux/device.h>

#include <linux/spi/spi.h>

#include <linux/i2c.h>

#include <linux/gpio.h>

#include <linux/fb.h>

#include <linux/backlight.h>

#include <linux/slab.h>

​

#include <asm/mach/sharpsl_param.h>

​

#include <mach/tosa.h>

​

#define COMADJ_DEFAULT  97

​

#define DAC_CH1     0

#define DAC_CH2     1

​

struct tosa_bl_data {

    struct i2c_client *i2c;

    struct backlight_device *bl;

​

    int comadj;

};

​

static void tosa_bl_set_backlight(struct tosa_bl_data *data, int brightness)

{

    struct spi_device *spi = dev_get_platdata(&data->i2c->dev);

​

    i2c_smbus_write_byte_data(data->i2c, DAC_CH1, data->comadj);

​

    /* SetBacklightDuty */

    i2c_smbus_write_byte_data(data->i2c, DAC_CH2, (u8)(brightness & 0xff));

​

    /* SetBacklightVR */

    gpio_set_value(TOSA_GPIO_BL_C20MA, brightness & 0x100);

​

    tosa_bl_enable(spi, brightness);

}

​

static int tosa_bl_update_status(struct backlight_device *dev)

{

    struct backlight_properties *props = &dev->props;

    struct tosa_bl_data *data = bl_get_data(dev);

    int power = max(props->power, props->fb_blank);

    int brightness = props->brightness;

​

    if (power)

        brightness = 0;

​