// SPDX-License-Identifier: GPL-2.0
#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/gfp.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/driver.h>
#include <linux/gpio.h>
#include "gpiolib.h"
/*
* **DEPRECATED** This function is deprecated and must not be used in new code.
*/
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
*
* **DEPRECATED** This function is deprecated and must not be used in new code.
*
* Returns:
* 0 on success, or negative errno on failure.
*/
int gpio_request_one(unsigned gpio, unsigned long flags, const char *label)
{
struct gpio_desc *desc;
int err;
/* Compatibility: assume unavailable "valid" GPIOs will appear later */
desc = gpio_to_desc(gpio);
if (!desc)
return -EPROBE_DEFER;
err = gpiod_request(desc, label);
if (err)
return err;
if (flags & GPIOF_ACTIVE_LOW)
set_bit(FLAG_ACTIVE_LOW, &desc->flags);
if (flags & GPIOF_IN)
err = gpiod_direction_input(desc);
else
err = gpiod_direction_output_raw(desc, !!(flags & GPIOF_OUT_INIT_HIGH));
if (err)
goto free_gpio;
return 0;
free_gpio:
gpiod_free(desc);
return err;
}
EXPORT_SYMBOL_GPL(gpio_request_one);
/*
* **DEPRECATED** This function is deprecated and must not be used in new code.
*/
int gpio_request(unsigned gpio, const char *label)
{
struct gpio_desc *desc;
/* Compatibility: assume unavailable "valid" GPIOs will appear later */
desc = gpio_to_desc(gpio);
if (!desc)
return -EPROBE_DEFER;
return gpiod_request(desc, label);
}
EXPORT_SYMBOL_GPL(gpio_request);
static void devm_gpio_release(struct device *dev, void *res)
{
unsigned *gpio = res;
gpio_free(*gpio);
}
/**
* devm_gpio_request - request a GPIO for a managed device
* @dev: device to request the GPIO for
* @gpio: GPIO to allocate
* @label: the name of the requested GPIO
*
* Except for the extra @dev argument, this function takes the
* same arguments and performs the same function as gpio_request().
* GPIOs requested with this function will be automatically freed
* on driver detach.
*
* **DEPRECATED** This function is deprecated and must not be used in new code.
*
* Returns:
* 0 on success, or negative errno on failure.
*/
int devm_gpio_request(struct device *dev, unsigned gpio, const char *label)
{
unsigned *dr;
int rc;
dr = devres_alloc(devm_gpio_release, sizeof(unsigned), GFP_KERNEL);
if (!dr)
return -ENOMEM;
rc = gpio_request(gpio, label);
if (rc) {
devres_free(dr);
return rc;
}
*dr = gpio;
devres_add(dev, dr);
return 0;
}
EXPORT_SYMBOL_GPL(devm_gpio_request);
/**
* devm_gpio_request_one - request a single GPIO with initial setup
* @dev: device to request for
* @gpio: the GPIO number
* @flags: GPIO configuration as specified by GPIOF_*
* @label: a literal description string of this GPIO
*
* **DEPRECATED** This function is deprecated and must not be used in new code.
*
* Returns:
* 0 on success, or negative errno on failure.
*/
int devm_gpio_request_one(struct device *dev, unsigned gpio,
unsigned long flags, const char *label)
{
unsigned *dr;
int rc;
dr = devres_alloc(devm_gpio_release, sizeof(unsigned), GFP_KERNEL);
if (!dr)
return -ENOMEM;
rc = gpio_request_one(gpio, flags, label);
if (rc) {
devres_free(dr);
return rc;
}
*dr = gpio;
devres_add(dev, dr);
return 0;
}
EXPORT_SYMBOL_GPL(devm_gpio_request_one);
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