linux-imx

/*

 * Backlight Driver for Dialog DA9052 PMICs

 *

 * Copyright(c) 2012 Dialog Semiconductor Ltd.

 *

 * Author: David Dajun Chen <dchen@diasemi.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 */

​

#include <linux/backlight.h>

#include <linux/delay.h>

#include <linux/fb.h>

#include <linux/module.h>

#include <linux/platform_device.h>

​

#include <linux/mfd/da9052/da9052.h>

#include <linux/mfd/da9052/reg.h>

​

#define DA9052_MAX_BRIGHTNESS       0xFF

​

enum {

    DA9052_WLEDS_OFF,

    DA9052_WLEDS_ON,

};

​

enum {

    DA9052_TYPE_WLED1,

    DA9052_TYPE_WLED2,

    DA9052_TYPE_WLED3,

};

​

static const unsigned char wled_bank[] = {

    DA9052_LED1_CONF_REG,

    DA9052_LED2_CONF_REG,

    DA9052_LED3_CONF_REG,

};

​

struct da9052_bl {

    struct da9052 *da9052;

    uint brightness;

    uint state;

    uint led_reg;

};

​

static int da9052_adjust_wled_brightness(struct da9052_bl *wleds)

{

    unsigned char boost_en;

    unsigned char i_sink;

    int ret;

​

    boost_en = 0x3F;

    i_sink = 0xFF;

    if (wleds->state == DA9052_WLEDS_OFF) {

        boost_en = 0x00;

        i_sink = 0x00;

    }

​

    ret = da9052_reg_write(wleds->da9052, DA9052_BOOST_REG, boost_en);