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/*
 * <linux/gpio.h> - userspace ABI for the GPIO character devices
 *
 * Copyright (C) 2016 Linus Walleij
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */
#ifndef _UAPI_GPIO_H_
#define _UAPI_GPIO_H_

#include <linux/const.h>
#include <linux/ioctl.h>
#include <linux/types.h>

/*
 * The maximum size of name and label arrays.
 *
 * Must be a multiple of 8 to ensure 32/64-bit alignment of structs.
 */
#define GPIO_MAX_NAME_SIZE 32

/**
 * struct gpiochip_info - Information about a certain GPIO chip
 * @name: the Linux kernel name of this GPIO chip
 * @label: a functional name for this GPIO chip, such as a product
 * number, may be empty (i.e. label[0] == '\0')
 * @lines: number of GPIO lines on this chip
 */
struct gpiochip_info {
	char name[GPIO_MAX_NAME_SIZE];
	char label[GPIO_MAX_NAME_SIZE];
	__u32 lines;
};

/*
 * Maximum number of requested lines.
 *
 * Must be no greater than 64, as bitmaps are restricted here to 64-bits
 * for simplicity, and a multiple of 2 to ensure 32/64-bit alignment of
 * structs.
 */
#define GPIO_V2_LINES_MAX 64

/*
 * The maximum number of configuration attributes associated with a line
 * request.
 */
#define GPIO_V2_LINE_NUM_ATTRS_MAX 10

/**
 * enum gpio_v2_line_flag - &struct gpio_v2_line_attribute.flags values
 * @GPIO_V2_LINE_FLAG_USED: line is not available for request
 * @GPIO_V2_LINE_FLAG_ACTIVE_LOW: line active state is physical low
 * @GPIO_V2_LINE_FLAG_INPUT: line is an input
 * @GPIO_V2_LINE_FLAG_OUTPUT: line is an output
 * @GPIO_V2_LINE_FLAG_EDGE_RISING: line detects rising (inactive to active)
 * edges
 * @GPIO_V2_LINE_FLAG_EDGE_FALLING: line detects falling (active to
 * inactive) edges
 * @GPIO_V2_LINE_FLAG_OPEN_DRAIN: line is an open drain output
 * @GPIO_V2_LINE_FLAG_OPEN_SOURCE: line is an open source output
 * @GPIO_V2_LINE_FLAG_BIAS_PULL_UP: line has pull-up bias enabled
 * @GPIO_V2_LINE_FLAG_BIAS_PULL_DOWN: line has pull-down bias enabled
 * @GPIO_V2_LINE_FLAG_BIAS_DISABLED: line has bias disabled
 * @GPIO_V2_LINE_FLAG_EVENT_CLOCK_REALTIME: line events contain REALTIME timestamps
 * @GPIO_V2_LINE_FLAG_EVENT_CLOCK_HTE: line events contain timestamps from
 * hardware timestamp engine
 */
enum gpio_v2_line_flag {
	GPIO_V2_LINE_FLAG_USED			= _BITULL(0),
	GPIO_V2_LINE_FLAG_ACTIVE_LOW		= _BITULL(1),
	GPIO_V2_LINE_FLAG_INPUT			= _BITULL(2),
	GPIO_V2_LINE_FLAG_OUTPUT		= _BITULL(3),
	GPIO_V2_LINE_FLAG_EDGE_RISING		= _BITULL(4),
	GPIO_V2_LINE_FLAG_EDGE_FALLING		= _BITULL(5),
	GPIO_V2_LINE_FLAG_OPEN_DRAIN		= _BITULL(6),
	GPIO_V2_LINE_FLAG_OPEN_SOURCE		= _BITULL(7),
	GPIO_V2_LINE_FLAG_BIAS_PULL_UP		= _BITULL(8),
	GPIO_V2_LINE_FLAG_BIAS_PULL_DOWN	= _BITULL(9),
	GPIO_V2_LINE_FLAG_BIAS_DISABLED		= _BITULL(10),
	GPIO_V2_LINE_FLAG_EVENT_CLOCK_REALTIME	= _BITULL(11),
	GPIO_V2_LINE_FLAG_EVENT_CLOCK_HTE	= _BITULL(12),
};

/**
 * struct gpio_v2_line_values - Values of GPIO lines
 * @bits: a bitmap containing the value of the lines, set to 1 for active
 * and 0 for inactive.
 * @mask: a bitmap identifying the lines to get or set, with each bit
 * number corresponding to the index into &struct
 * gpio_v2_line_request.offsets.
 */
struct gpio_v2_line_values {
	__aligned_u64 bits;
	__aligned_u64 mask;
};

/**
 * enum gpio_v2_line_attr_id - &struct gpio_v2_line_attribute.id values
 * identifying which field of the attribute union is in use.
 * @GPIO_V2_LINE_ATTR_ID_FLAGS: flags field is in use
 * @GPIO_V2_LINE_ATTR_ID_OUTPUT_VALUES: values field is in use
 * @GPIO_V2_LINE_ATTR_ID_DEBOUNCE: debounce_period_us field is in use
 */
enum gpio_v2_line_attr_id {
	GPIO_V2_LINE_ATTR_ID_FLAGS		= 1,
	GPIO_V2_LINE_ATTR_ID_OUTPUT_VALUES	= 2,
	GPIO_V2_LINE_ATTR_ID_DEBOUNCE		= 3,
};

/**
 * struct gpio_v2_line_attribute - a configurable attribute of a line
 * @id: attribute identifier with value from &enum gpio_v2_line_attr_id
 *