mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 14:43:58 +08:00
dae5f0afcf
Use the SPDX headers and cut down on boilerplate to indicate the license in the core gpiolib implementation. Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
114 lines
2.4 KiB
C
114 lines
2.4 KiB
C
// 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);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpio_request_one);
|
|
|
|
int gpio_request(unsigned gpio, const char *label)
|
|
{
|
|
struct gpio_desc *desc = gpio_to_desc(gpio);
|
|
|
|
/* Compatibility: assume unavailable "valid" GPIOs will appear later */
|
|
if (!desc && gpio_is_valid(gpio))
|
|
return -EPROBE_DEFER;
|
|
|
|
return gpiod_request(desc, label);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpio_request);
|
|
|
|
/**
|
|
* gpio_request_array - request multiple GPIOs in a single call
|
|
* @array: array of the 'struct gpio'
|
|
* @num: how many GPIOs in the array
|
|
*/
|
|
int gpio_request_array(const struct gpio *array, size_t num)
|
|
{
|
|
int i, err;
|
|
|
|
for (i = 0; i < num; i++, array++) {
|
|
err = gpio_request_one(array->gpio, array->flags, array->label);
|
|
if (err)
|
|
goto err_free;
|
|
}
|
|
return 0;
|
|
|
|
err_free:
|
|
while (i--)
|
|
gpio_free((--array)->gpio);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpio_request_array);
|
|
|
|
/**
|
|
* gpio_free_array - release multiple GPIOs in a single call
|
|
* @array: array of the 'struct gpio'
|
|
* @num: how many GPIOs in the array
|
|
*/
|
|
void gpio_free_array(const struct gpio *array, size_t num)
|
|
{
|
|
while (num--)
|
|
gpio_free((array++)->gpio);
|
|
}
|
|
EXPORT_SYMBOL_GPL(gpio_free_array);
|