linux-imx

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

/*

 * gpiolib support for Wolfson WM8994

 *

 * 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/regmap.h>

​

#include <linux/mfd/wm8994/core.h>

#include <linux/mfd/wm8994/pdata.h>

#include <linux/mfd/wm8994/gpio.h>

#include <linux/mfd/wm8994/registers.h>

​

struct wm8994_gpio {

    struct wm8994 *wm8994;

    struct gpio_chip gpio_chip;

};

​

static int wm8994_gpio_request(struct gpio_chip *chip, unsigned offset)

{

    struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);

    struct wm8994 *wm8994 = wm8994_gpio->wm8994;

​

    switch (wm8994->type) {

    case WM8958:

        switch (offset) {

        case 1:

        case 2:

        case 3:

        case 4:

        case 6:

            return -EINVAL;

        }

        break;

    default:

        break;

    }

​

    return 0;

}

​

static int wm8994_gpio_direction_in(struct gpio_chip *chip, unsigned offset)

{

    struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);

    struct wm8994 *wm8994 = wm8994_gpio->wm8994;

​

    return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,

                   WM8994_GPN_DIR, WM8994_GPN_DIR);

}

​

static int wm8994_gpio_get(struct gpio_chip *chip, unsigned offset)

{

    struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);

    struct wm8994 *wm8994 = wm8994_gpio->wm8994;

    int ret;

​

    ret = wm8994_reg_read(wm8994, WM8994_GPIO_1 + offset);

    if (ret < 0)

        return ret;

​

    if (ret & WM8994_GPN_LVL)

        return 1;

    else

        return 0;

}

​

static int wm8994_gpio_direction_out(struct gpio_chip *chip,

                     unsigned offset, int value)

{

    struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip);

    struct wm8994 *wm8994 = wm8994_gpio->wm8994;

​

    if (value)

        value = WM8994_GPN_LVL;

​

    return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset,

                   WM8994_GPN_DIR | WM8994_GPN_LVL, value);

}

​

static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value)

{