linux-imx

// SPDX-License-Identifier: GPL-2.0+

/*

 * gpiolib support for Wolfson WM831x PMICs

 *

 * Copyright 2009 Wolfson Microelectronics PLC.

 *

 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>

 *

 */

​

#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/module.h>

#include <linux/gpio/driver.h>

#include <linux/mfd/core.h>

#include <linux/platform_device.h>

#include <linux/seq_file.h>

​

#include <linux/mfd/wm831x/core.h>

#include <linux/mfd/wm831x/pdata.h>

#include <linux/mfd/wm831x/gpio.h>

#include <linux/mfd/wm831x/irq.h>

​

struct wm831x_gpio {

    struct wm831x *wm831x;

    struct gpio_chip gpio_chip;

};

​

static int wm831x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)

{

    struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);

    struct wm831x *wm831x = wm831x_gpio->wm831x;

    int val = WM831X_GPN_DIR;

​

    if (wm831x->has_gpio_ena)

        val |= WM831X_GPN_TRI;

​

    return wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset,

                   WM831X_GPN_DIR | WM831X_GPN_TRI |

                   WM831X_GPN_FN_MASK, val);

}

​

static int wm831x_gpio_get(struct gpio_chip *chip, unsigned offset)

{

    struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);

    struct wm831x *wm831x = wm831x_gpio->wm831x;

    int ret;

​

    ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL);

    if (ret < 0)

        return ret;

​

    if (ret & 1 << offset)

        return 1;

    else

        return 0;

}

​

static void wm831x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)

{

    struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);

    struct wm831x *wm831x = wm831x_gpio->wm831x;

​