linux-imx

// SPDX-License-Identifier: GPL-2.0

#include <linux/gpio/consumer.h>

#include <linux/gpio/driver.h>

​

#include <linux/gpio.h>

​

#include "gpiolib.h"

​

void gpio_free(unsigned gpio)

{

    gpiod_free(gpio_to_desc(gpio));

}

EXPORT_SYMBOL_GPL(gpio_free);

​

/**

 * gpio_request_one - request a single GPIO with initial configuration

 * @gpio:   the GPIO number

 * @flags:  GPIO configuration as specified by GPIOF_*

 * @label:  a literal description string of this GPIO

 */

int gpio_request_one(unsigned gpio, unsigned long flags, const char *label)

{

    struct gpio_desc *desc;

    int err;

​

    desc = gpio_to_desc(gpio);

​

    /* Compatibility: assume unavailable "valid" GPIOs will appear later */

    if (!desc && gpio_is_valid(gpio))

        return -EPROBE_DEFER;

​

    err = gpiod_request(desc, label);

    if (err)

        return err;

​

    if (flags & GPIOF_OPEN_DRAIN)

        set_bit(FLAG_OPEN_DRAIN, &desc->flags);

​

    if (flags & GPIOF_OPEN_SOURCE)

        set_bit(FLAG_OPEN_SOURCE, &desc->flags);

​

    if (flags & GPIOF_ACTIVE_LOW)

        set_bit(FLAG_ACTIVE_LOW, &desc->flags);

​

    if (flags & GPIOF_DIR_IN)

        err = gpiod_direction_input(desc);

    else

        err = gpiod_direction_output_raw(desc,

                (flags & GPIOF_INIT_HIGH) ? 1 : 0);

​

    if (err)

        goto free_gpio;

​

    if (flags & GPIOF_EXPORT) {

        err = gpiod_export(desc, flags & GPIOF_EXPORT_CHANGEABLE);

        if (err)

            goto free_gpio;

    }

​

    return 0;

​

 free_gpio:

    gpiod_free(desc);