linux-imx

/*

 * GPIO driver for RICOH583 power management chip.

 *

 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.

 * Author: Laxman dewangan <ldewangan@nvidia.com>

 *

 * Based on code

 *  Copyright (C) 2011 RICOH COMPANY,LTD

 *

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

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

 * more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 *

 */

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/platform_device.h>

#include <linux/device.h>

#include <linux/gpio/driver.h>

#include <linux/mfd/rc5t583.h>

​

struct rc5t583_gpio {

    struct gpio_chip gpio_chip;

    struct rc5t583 *rc5t583;

};

​

static int rc5t583_gpio_get(struct gpio_chip *gc, unsigned int offset)

{

    struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);

    struct device *parent = rc5t583_gpio->rc5t583->dev;

    uint8_t val = 0;

    int ret;

​

    ret = rc5t583_read(parent, RC5T583_GPIO_MON_IOIN, &val);

    if (ret < 0)

        return ret;

​

    return !!(val & BIT(offset));

}

​

static void rc5t583_gpio_set(struct gpio_chip *gc, unsigned int offset, int val)

{

    struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);

    struct device *parent = rc5t583_gpio->rc5t583->dev;

    if (val)

        rc5t583_set_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset));

    else

        rc5t583_clear_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset));

}

​

static int rc5t583_gpio_dir_input(struct gpio_chip *gc, unsigned int offset)

{

    struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);

    struct device *parent = rc5t583_gpio->rc5t583->dev;