gpiolib-legacy.c

  1// SPDX-License-Identifier: GPL-2.0
  2#include <linux/bitops.h>
  3#include <linux/device.h>
  4#include <linux/errno.h>
  5#include <linux/export.h>
  6#include <linux/gfp.h>
  7
  8#include <linux/gpio/consumer.h>
  9#include <linux/gpio/driver.h>
 10
 11#include <linux/gpio.h>
 12
 13#include "gpiolib.h"
 14
 15/*
 16 * **DEPRECATED** This function is deprecated and must not be used in new code.
 17 */
 18void gpio_free(unsigned gpio)
 19{
 20	gpiod_free(gpio_to_desc(gpio));
 21}
 22EXPORT_SYMBOL_GPL(gpio_free);
 23
 24/**
 25 * gpio_request_one - request a single GPIO with initial configuration
 26 * @gpio:	the GPIO number
 27 * @flags:	GPIO configuration as specified by GPIOF_*
 28 * @label:	a literal description string of this GPIO
 29 *
 30 * **DEPRECATED** This function is deprecated and must not be used in new code.
 31 *
 32 * Returns:
 33 * 0 on success, or negative errno on failure.
 34 */
 35int gpio_request_one(unsigned gpio, unsigned long flags, const char *label)
 36{
 37	int err;
 38
 39	err = gpio_request(gpio, label);
 40	if (err)
 41		return err;
 42
 43	if (flags & GPIOF_IN)
 44		err = gpio_direction_input(gpio);
 45	else
 46		err = gpio_direction_output(gpio, !!(flags & GPIOF_OUT_INIT_HIGH));
 47
 48	if (err)
 49		gpio_free(gpio);
 50
 51	return err;
 52}
 53EXPORT_SYMBOL_GPL(gpio_request_one);
 54
 55/*
 56 * **DEPRECATED** This function is deprecated and must not be used in new code.
 57 */
 58int gpio_request(unsigned gpio, const char *label)
 59{
 60	struct gpio_desc *desc;
 61
 62	/* Compatibility: assume unavailable "valid" GPIOs will appear later */
 63	desc = gpio_to_desc(gpio);
 64	if (!desc)
 65		return -EPROBE_DEFER;
 66
 67	return gpiod_request(desc, label);
 68}
 69EXPORT_SYMBOL_GPL(gpio_request);
 70
 71static void devm_gpio_release(void *gpio)
 72{
 73	gpio_free((unsigned)(unsigned long)gpio);
 74}
 75
 76/**
 77 * devm_gpio_request_one - request a single GPIO with initial setup
 78 * @dev: device to request for
 79 * @gpio: the GPIO number
 80 * @flags: GPIO configuration as specified by GPIOF_*
 81 * @label: a literal description string of this GPIO
 82 *
 83 * **DEPRECATED** This function is deprecated and must not be used in new code.
 84 *
 85 * Returns:
 86 * 0 on success, or negative errno on failure.
 87 */
 88int devm_gpio_request_one(struct device *dev, unsigned gpio,
 89			  unsigned long flags, const char *label)
 90{
 91	int rc;
 92
 93	rc = gpio_request(gpio, label);
 94	if (rc)
 95		return rc;
 96
 97	if (flags & GPIOF_IN)
 98		rc = gpio_direction_input(gpio);
 99	else
100		rc = gpio_direction_output(gpio, !!(flags & GPIOF_OUT_INIT_HIGH));
101
102	if (rc) {
103		gpio_free(gpio);
104		return rc;
105	}
106
107	return devm_add_action_or_reset(dev, devm_gpio_release, (void *)(unsigned long)gpio);
108}
109EXPORT_SYMBOL_GPL(devm_gpio_request_one);