[linux-2.6-block.git] / tools / gpio / gpio-utils.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * GPIO tools - utility helpers library for the GPIO tools
 *
 * Copyright (C) 2015 Linus Walleij
 *
 * Portions copied from iio_utils and lssio:
 * Copyright (c) 2010 Manuel Stahl <manuel.stahl@iis.fraunhofer.de>
 * Copyright (c) 2008 Jonathan Cameron
 * *
 */
#ifndef _GPIO_UTILS_H_
#define _GPIO_UTILS_H_

#include <stdbool.h>
#include <string.h>
#include <linux/types.h>

#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))

static inline int check_prefix(const char *str, const char *prefix)
{
	return strlen(str) > strlen(prefix) &&
		strncmp(str, prefix, strlen(prefix)) == 0;
}

int gpiotools_request_line(const char *device_name,
			   unsigned int *lines,
			   unsigned int num_lines,
			   struct gpio_v2_line_config *config,
			   const char *consumer);
int gpiotools_set_values(const int fd, struct gpio_v2_line_values *values);
int gpiotools_get_values(const int fd, struct gpio_v2_line_values *values);
int gpiotools_release_line(const int fd);

int gpiotools_get(const char *device_name, unsigned int line);
int gpiotools_gets(const char *device_name, unsigned int *lines,
		   unsigned int num_lines, unsigned int *values);
int gpiotools_set(const char *device_name, unsigned int line,
		  unsigned int value);
int gpiotools_sets(const char *device_name, unsigned int *lines,
		   unsigned int num_lines, unsigned int *values);

/* helper functions for gpio_v2_line_values bits */
static inline void gpiotools_set_bit(__u64 *b, int n)
{
	*b |= _BITULL(n);
}

static inline void gpiotools_change_bit(__u64 *b, int n)
{
	*b ^= _BITULL(n);
}

static inline void gpiotools_clear_bit(__u64 *b, int n)
{
	*b &= ~_BITULL(n);
}

static inline int gpiotools_test_bit(__u64 b, int n)
{
	return !!(b & _BITULL(n));
}

static inline void gpiotools_assign_bit(__u64 *b, int n, bool value)
{
	if (value)
		gpiotools_set_bit(b, n);
	else
		gpiotools_clear_bit(b, n);
}

#endif /* _GPIO_UTILS_H_ */
Commit	Line	Data
d2912cb1	1	/* SPDX-License-Identifier: GPL-2.0-only */
6d591c46 LW	2	/*
	3	* GPIO tools - utility helpers library for the GPIO tools
	4	*
	5	* Copyright (C) 2015 Linus Walleij
	6	*
	7	* Portions copied from iio_utils and lssio:
	8	* Copyright (c) 2010 Manuel Stahl <manuel.stahl@iis.fraunhofer.de>
	9	* Copyright (c) 2008 Jonathan Cameron
	10	* *
6d591c46 LW	11	*/
	12	#ifndef _GPIO_UTILS_H_
	13	#define _GPIO_UTILS_H_
	14
7ff6d1d2	15	#include <stdbool.h>
6d591c46	16	#include <string.h>
7ff6d1d2	17	#include <linux/types.h>
6d591c46	18
521a2ad6 LW	19	#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
521a2ad6 LW	20
6d591c46 LW	21	static inline int check_prefix(const char str, const char prefix)
	22	{
	23	return strlen(str) > strlen(prefix) &&
	24	strncmp(str, prefix, strlen(prefix)) == 0;
	25	}
	26
7ff6d1d2 KG	27	int gpiotools_request_line(const char *device_name,
	28	unsigned int *lines,
	29	unsigned int num_lines,
	30	struct gpio_v2_line_config *config,
	31	const char *consumer);
	32	int gpiotools_set_values(const int fd, struct gpio_v2_line_values *values);
	33	int gpiotools_get_values(const int fd, struct gpio_v2_line_values *values);
	34	int gpiotools_release_line(const int fd);
	35
e1acec0e BJZ	36	int gpiotools_get(const char *device_name, unsigned int line);
e1acec0e BJZ	37	int gpiotools_gets(const char device_name, unsigned int lines,
7ff6d1d2	38	unsigned int num_lines, unsigned int *values);
e1acec0e BJZ	39	int gpiotools_set(const char *device_name, unsigned int line,
	40	unsigned int value);
	41	int gpiotools_sets(const char device_name, unsigned int lines,
7ff6d1d2 KG	42	unsigned int num_lines, unsigned int *values);
	43
	44	/* helper functions for gpio_v2_line_values bits */
	45	static inline void gpiotools_set_bit(__u64 *b, int n)
	46	{
	47	*b \|= _BITULL(n);
	48	}
	49
	50	static inline void gpiotools_change_bit(__u64 *b, int n)
	51	{
	52	*b ^= _BITULL(n);
	53	}
	54
	55	static inline void gpiotools_clear_bit(__u64 *b, int n)
	56	{
	57	*b &= ~_BITULL(n);
	58	}
	59
	60	static inline int gpiotools_test_bit(__u64 b, int n)
	61	{
	62	return !!(b & _BITULL(n));
	63	}
	64
	65	static inline void gpiotools_assign_bit(__u64 *b, int n, bool value)
	66	{
	67	if (value)
	68	gpiotools_set_bit(b, n);
	69	else
	70	gpiotools_clear_bit(b, n);
	71	}
e1acec0e	72
6d591c46	73	#endif /* _GPIO_UTILS_H_ */