linux-imx

/*

 *  Backlight Driver for the KB3886 Backlight

 *

 *  Copyright (c) 2007-2008 Claudio Nieder

 *

 *  Based on corgi_bl.c by Richard Purdie and kb3886 driver by Robert Woerle

 *

 *  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/kernel.h>

#include <linux/init.h>

#include <linux/platform_device.h>

#include <linux/mutex.h>

#include <linux/fb.h>

#include <linux/backlight.h>

#include <linux/delay.h>

#include <linux/dmi.h>

​

#define KB3886_PARENT 0x64

#define KB3886_IO 0x60

#define KB3886_ADC_DAC_PWM 0xC4

#define KB3886_PWM0_WRITE 0x81

#define KB3886_PWM0_READ 0x41

​

static DEFINE_MUTEX(bl_mutex);

​

static void kb3886_bl_set_intensity(int intensity)

{

    mutex_lock(&bl_mutex);

    intensity = intensity&0xff;

    outb(KB3886_ADC_DAC_PWM, KB3886_PARENT);

    usleep_range(10000, 11000);

    outb(KB3886_PWM0_WRITE, KB3886_IO);

    usleep_range(10000, 11000);

    outb(intensity, KB3886_IO);

    mutex_unlock(&bl_mutex);

}

​

struct kb3886bl_machinfo {

    int max_intensity;

    int default_intensity;

    int limit_mask;

    void (*set_bl_intensity)(int intensity);

};

​

static struct kb3886bl_machinfo kb3886_bl_machinfo = {

    .max_intensity = 0xff,

    .default_intensity = 0xa0,

    .limit_mask = 0x7f,

    .set_bl_intensity = kb3886_bl_set_intensity,

};

​

static struct platform_device kb3886bl_device = {

    .name       = "kb3886-bl",

    .dev        = {

        .platform_data  = &kb3886_bl_machinfo,

    },

    .id     = -1,