529 lines
19 KiB
C
529 lines
19 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
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/*
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* <linux/gpio.h> - userspace ABI for the GPIO character devices
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*
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* Copyright (C) 2016 Linus Walleij
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#ifndef _UAPI_GPIO_H_
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#define _UAPI_GPIO_H_
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#include <linux/const.h>
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#include <linux/ioctl.h>
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#include <linux/types.h>
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/*
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* The maximum size of name and label arrays.
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*
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* Must be a multiple of 8 to ensure 32/64-bit alignment of structs.
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*/
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#define GPIO_MAX_NAME_SIZE 32
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/**
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* struct gpiochip_info - Information about a certain GPIO chip
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* @name: the Linux kernel name of this GPIO chip
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* @label: a functional name for this GPIO chip, such as a product
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* number, may be empty (i.e. label[0] == '\0')
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* @lines: number of GPIO lines on this chip
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*/
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struct gpiochip_info {
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char name[GPIO_MAX_NAME_SIZE];
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char label[GPIO_MAX_NAME_SIZE];
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__u32 lines;
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};
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/*
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* Maximum number of requested lines.
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*
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* Must be no greater than 64, as bitmaps are restricted here to 64-bits
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* for simplicity, and a multiple of 2 to ensure 32/64-bit alignment of
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* structs.
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*/
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#define GPIO_V2_LINES_MAX 64
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/*
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* The maximum number of configuration attributes associated with a line
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* request.
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*/
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#define GPIO_V2_LINE_NUM_ATTRS_MAX 10
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/**
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* enum gpio_v2_line_flag - &struct gpio_v2_line_attribute.flags values
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* @GPIO_V2_LINE_FLAG_USED: line is not available for request
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* @GPIO_V2_LINE_FLAG_ACTIVE_LOW: line active state is physical low
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* @GPIO_V2_LINE_FLAG_INPUT: line is an input
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* @GPIO_V2_LINE_FLAG_OUTPUT: line is an output
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* @GPIO_V2_LINE_FLAG_EDGE_RISING: line detects rising (inactive to active)
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* edges
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* @GPIO_V2_LINE_FLAG_EDGE_FALLING: line detects falling (active to
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* inactive) edges
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* @GPIO_V2_LINE_FLAG_OPEN_DRAIN: line is an open drain output
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* @GPIO_V2_LINE_FLAG_OPEN_SOURCE: line is an open source output
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* @GPIO_V2_LINE_FLAG_BIAS_PULL_UP: line has pull-up bias enabled
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* @GPIO_V2_LINE_FLAG_BIAS_PULL_DOWN: line has pull-down bias enabled
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* @GPIO_V2_LINE_FLAG_BIAS_DISABLED: line has bias disabled
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* @GPIO_V2_LINE_FLAG_EVENT_CLOCK_REALTIME: line events contain REALTIME timestamps
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*/
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enum gpio_v2_line_flag {
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GPIO_V2_LINE_FLAG_USED = _BITULL(0),
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GPIO_V2_LINE_FLAG_ACTIVE_LOW = _BITULL(1),
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GPIO_V2_LINE_FLAG_INPUT = _BITULL(2),
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GPIO_V2_LINE_FLAG_OUTPUT = _BITULL(3),
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GPIO_V2_LINE_FLAG_EDGE_RISING = _BITULL(4),
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GPIO_V2_LINE_FLAG_EDGE_FALLING = _BITULL(5),
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GPIO_V2_LINE_FLAG_OPEN_DRAIN = _BITULL(6),
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GPIO_V2_LINE_FLAG_OPEN_SOURCE = _BITULL(7),
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GPIO_V2_LINE_FLAG_BIAS_PULL_UP = _BITULL(8),
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GPIO_V2_LINE_FLAG_BIAS_PULL_DOWN = _BITULL(9),
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GPIO_V2_LINE_FLAG_BIAS_DISABLED = _BITULL(10),
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GPIO_V2_LINE_FLAG_EVENT_CLOCK_REALTIME = _BITULL(11),
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};
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/**
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* struct gpio_v2_line_values - Values of GPIO lines
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* @bits: a bitmap containing the value of the lines, set to 1 for active
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* and 0 for inactive.
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* @mask: a bitmap identifying the lines to get or set, with each bit
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* number corresponding to the index into &struct
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* gpio_v2_line_request.offsets.
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*/
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struct gpio_v2_line_values {
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__aligned_u64 bits;
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__aligned_u64 mask;
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};
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/**
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* enum gpio_v2_line_attr_id - &struct gpio_v2_line_attribute.id values
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* identifying which field of the attribute union is in use.
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* @GPIO_V2_LINE_ATTR_ID_FLAGS: flags field is in use
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* @GPIO_V2_LINE_ATTR_ID_OUTPUT_VALUES: values field is in use
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* @GPIO_V2_LINE_ATTR_ID_DEBOUNCE: debounce_period_us field is in use
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*/
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enum gpio_v2_line_attr_id {
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GPIO_V2_LINE_ATTR_ID_FLAGS = 1,
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GPIO_V2_LINE_ATTR_ID_OUTPUT_VALUES = 2,
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GPIO_V2_LINE_ATTR_ID_DEBOUNCE = 3,
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};
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/**
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* struct gpio_v2_line_attribute - a configurable attribute of a line
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* @id: attribute identifier with value from &enum gpio_v2_line_attr_id
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* @padding: reserved for future use and must be zero filled
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* @flags: if id is %GPIO_V2_LINE_ATTR_ID_FLAGS, the flags for the GPIO
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* line, with values from &enum gpio_v2_line_flag, such as
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* %GPIO_V2_LINE_FLAG_ACTIVE_LOW, %GPIO_V2_LINE_FLAG_OUTPUT etc, added
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* together. This overrides the default flags contained in the &struct
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* gpio_v2_line_config for the associated line.
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* @values: if id is %GPIO_V2_LINE_ATTR_ID_OUTPUT_VALUES, a bitmap
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* containing the values to which the lines will be set, with each bit
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* number corresponding to the index into &struct
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* gpio_v2_line_request.offsets.
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* @debounce_period_us: if id is %GPIO_V2_LINE_ATTR_ID_DEBOUNCE, the
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* desired debounce period, in microseconds
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*/
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struct gpio_v2_line_attribute {
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__u32 id;
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__u32 padding;
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union {
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__aligned_u64 flags;
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__aligned_u64 values;
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__u32 debounce_period_us;
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};
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};
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/**
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* struct gpio_v2_line_config_attribute - a configuration attribute
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* associated with one or more of the requested lines.
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* @attr: the configurable attribute
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* @mask: a bitmap identifying the lines to which the attribute applies,
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* with each bit number corresponding to the index into &struct
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* gpio_v2_line_request.offsets.
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*/
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struct gpio_v2_line_config_attribute {
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struct gpio_v2_line_attribute attr;
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__aligned_u64 mask;
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};
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/**
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* struct gpio_v2_line_config - Configuration for GPIO lines
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* @flags: flags for the GPIO lines, with values from &enum
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* gpio_v2_line_flag, such as %GPIO_V2_LINE_FLAG_ACTIVE_LOW,
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* %GPIO_V2_LINE_FLAG_OUTPUT etc, added together. This is the default for
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* all requested lines but may be overridden for particular lines using
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* @attrs.
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* @num_attrs: the number of attributes in @attrs
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* @padding: reserved for future use and must be zero filled
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* @attrs: the configuration attributes associated with the requested
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* lines. Any attribute should only be associated with a particular line
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* once. If an attribute is associated with a line multiple times then the
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* first occurrence (i.e. lowest index) has precedence.
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*/
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struct gpio_v2_line_config {
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__aligned_u64 flags;
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__u32 num_attrs;
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/* Pad to fill implicit padding and reserve space for future use. */
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__u32 padding[5];
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struct gpio_v2_line_config_attribute attrs[GPIO_V2_LINE_NUM_ATTRS_MAX];
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};
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/**
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* struct gpio_v2_line_request - Information about a request for GPIO lines
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* @offsets: an array of desired lines, specified by offset index for the
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* associated GPIO chip
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* @consumer: a desired consumer label for the selected GPIO lines such as
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* "my-bitbanged-relay"
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* @config: requested configuration for the lines.
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* @num_lines: number of lines requested in this request, i.e. the number
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* of valid fields in the %GPIO_V2_LINES_MAX sized arrays, set to 1 to
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* request a single line
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* @event_buffer_size: a suggested minimum number of line events that the
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* kernel should buffer. This is only relevant if edge detection is
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* enabled in the configuration. Note that this is only a suggested value
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* and the kernel may allocate a larger buffer or cap the size of the
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* buffer. If this field is zero then the buffer size defaults to a minimum
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* of @num_lines * 16.
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* @padding: reserved for future use and must be zero filled
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* @fd: if successful this field will contain a valid anonymous file handle
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* after a %GPIO_GET_LINE_IOCTL operation, zero or negative value means
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* error
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*/
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struct gpio_v2_line_request {
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__u32 offsets[GPIO_V2_LINES_MAX];
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char consumer[GPIO_MAX_NAME_SIZE];
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struct gpio_v2_line_config config;
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__u32 num_lines;
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__u32 event_buffer_size;
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/* Pad to fill implicit padding and reserve space for future use. */
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__u32 padding[5];
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__s32 fd;
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};
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/**
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* struct gpio_v2_line_info - Information about a certain GPIO line
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* @name: the name of this GPIO line, such as the output pin of the line on
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* the chip, a rail or a pin header name on a board, as specified by the
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* GPIO chip, may be empty (i.e. name[0] == '\0')
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* @consumer: a functional name for the consumer of this GPIO line as set
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* by whatever is using it, will be empty if there is no current user but
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* may also be empty if the consumer doesn't set this up
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* @offset: the local offset on this GPIO chip, fill this in when
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* requesting the line information from the kernel
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* @num_attrs: the number of attributes in @attrs
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* @flags: flags for this GPIO line, with values from &enum
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* gpio_v2_line_flag, such as %GPIO_V2_LINE_FLAG_ACTIVE_LOW,
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* %GPIO_V2_LINE_FLAG_OUTPUT etc, added together.
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* @attrs: the configuration attributes associated with the line
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* @padding: reserved for future use
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*/
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struct gpio_v2_line_info {
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char name[GPIO_MAX_NAME_SIZE];
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char consumer[GPIO_MAX_NAME_SIZE];
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__u32 offset;
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__u32 num_attrs;
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__aligned_u64 flags;
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struct gpio_v2_line_attribute attrs[GPIO_V2_LINE_NUM_ATTRS_MAX];
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/* Space reserved for future use. */
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__u32 padding[4];
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};
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/**
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* enum gpio_v2_line_changed_type - &struct gpio_v2_line_changed.event_type
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* values
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* @GPIO_V2_LINE_CHANGED_REQUESTED: line has been requested
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* @GPIO_V2_LINE_CHANGED_RELEASED: line has been released
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* @GPIO_V2_LINE_CHANGED_CONFIG: line has been reconfigured
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*/
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enum gpio_v2_line_changed_type {
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GPIO_V2_LINE_CHANGED_REQUESTED = 1,
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GPIO_V2_LINE_CHANGED_RELEASED = 2,
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GPIO_V2_LINE_CHANGED_CONFIG = 3,
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};
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/**
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* struct gpio_v2_line_info_changed - Information about a change in status
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* of a GPIO line
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* @info: updated line information
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* @timestamp_ns: estimate of time of status change occurrence, in nanoseconds
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* @event_type: the type of change with a value from &enum
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* gpio_v2_line_changed_type
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* @padding: reserved for future use
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*/
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struct gpio_v2_line_info_changed {
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struct gpio_v2_line_info info;
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__aligned_u64 timestamp_ns;
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__u32 event_type;
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/* Pad struct to 64-bit boundary and reserve space for future use. */
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__u32 padding[5];
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};
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/**
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* enum gpio_v2_line_event_id - &struct gpio_v2_line_event.id values
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* @GPIO_V2_LINE_EVENT_RISING_EDGE: event triggered by a rising edge
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* @GPIO_V2_LINE_EVENT_FALLING_EDGE: event triggered by a falling edge
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*/
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enum gpio_v2_line_event_id {
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GPIO_V2_LINE_EVENT_RISING_EDGE = 1,
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GPIO_V2_LINE_EVENT_FALLING_EDGE = 2,
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};
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/**
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* struct gpio_v2_line_event - The actual event being pushed to userspace
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* @timestamp_ns: best estimate of time of event occurrence, in nanoseconds.
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* @id: event identifier with value from &enum gpio_v2_line_event_id
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* @offset: the offset of the line that triggered the event
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* @seqno: the sequence number for this event in the sequence of events for
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* all the lines in this line request
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* @line_seqno: the sequence number for this event in the sequence of
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* events on this particular line
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* @padding: reserved for future use
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*
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* By default the @timestamp_ns is read from %CLOCK_MONOTONIC and is
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* intended to allow the accurate measurement of the time between events.
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* It does not provide the wall-clock time.
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*
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* If the %GPIO_V2_LINE_FLAG_EVENT_CLOCK_REALTIME flag is set then the
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* @timestamp_ns is read from %CLOCK_REALTIME.
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*/
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struct gpio_v2_line_event {
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__aligned_u64 timestamp_ns;
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__u32 id;
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__u32 offset;
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__u32 seqno;
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__u32 line_seqno;
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/* Space reserved for future use. */
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__u32 padding[6];
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};
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/*
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* ABI v1
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*
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* This version of the ABI is deprecated.
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* Use the latest version of the ABI, defined above, instead.
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*/
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/* Informational flags */
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#define GPIOLINE_FLAG_KERNEL (1UL << 0) /* Line used by the kernel */
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#define GPIOLINE_FLAG_IS_OUT (1UL << 1)
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#define GPIOLINE_FLAG_ACTIVE_LOW (1UL << 2)
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#define GPIOLINE_FLAG_OPEN_DRAIN (1UL << 3)
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#define GPIOLINE_FLAG_OPEN_SOURCE (1UL << 4)
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#define GPIOLINE_FLAG_BIAS_PULL_UP (1UL << 5)
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#define GPIOLINE_FLAG_BIAS_PULL_DOWN (1UL << 6)
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#define GPIOLINE_FLAG_BIAS_DISABLE (1UL << 7)
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/**
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* struct gpioline_info - Information about a certain GPIO line
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* @line_offset: the local offset on this GPIO device, fill this in when
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* requesting the line information from the kernel
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* @flags: various flags for this line
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* @name: the name of this GPIO line, such as the output pin of the line on the
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* chip, a rail or a pin header name on a board, as specified by the gpio
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* chip, may be empty (i.e. name[0] == '\0')
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* @consumer: a functional name for the consumer of this GPIO line as set by
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* whatever is using it, will be empty if there is no current user but may
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* also be empty if the consumer doesn't set this up
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*
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* Note: This struct is part of ABI v1 and is deprecated.
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* Use &struct gpio_v2_line_info instead.
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*/
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struct gpioline_info {
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__u32 line_offset;
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__u32 flags;
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char name[GPIO_MAX_NAME_SIZE];
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char consumer[GPIO_MAX_NAME_SIZE];
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};
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/* Maximum number of requested handles */
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#define GPIOHANDLES_MAX 64
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/* Possible line status change events */
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enum {
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GPIOLINE_CHANGED_REQUESTED = 1,
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GPIOLINE_CHANGED_RELEASED,
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GPIOLINE_CHANGED_CONFIG,
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};
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/**
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* struct gpioline_info_changed - Information about a change in status
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* of a GPIO line
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* @info: updated line information
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* @timestamp: estimate of time of status change occurrence, in nanoseconds
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* @event_type: one of %GPIOLINE_CHANGED_REQUESTED,
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* %GPIOLINE_CHANGED_RELEASED and %GPIOLINE_CHANGED_CONFIG
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* @padding: reserved for future use
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*
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* The &struct gpioline_info embedded here has 32-bit alignment on its own,
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* but it works fine with 64-bit alignment too. With its 72 byte size, we can
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* guarantee there are no implicit holes between it and subsequent members.
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* The 20-byte padding at the end makes sure we don't add any implicit padding
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* at the end of the structure on 64-bit architectures.
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*
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* Note: This struct is part of ABI v1 and is deprecated.
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* Use &struct gpio_v2_line_info_changed instead.
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*/
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struct gpioline_info_changed {
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struct gpioline_info info;
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__u64 timestamp;
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__u32 event_type;
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__u32 padding[5]; /* for future use */
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};
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/* Linerequest flags */
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#define GPIOHANDLE_REQUEST_INPUT (1UL << 0)
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#define GPIOHANDLE_REQUEST_OUTPUT (1UL << 1)
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#define GPIOHANDLE_REQUEST_ACTIVE_LOW (1UL << 2)
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#define GPIOHANDLE_REQUEST_OPEN_DRAIN (1UL << 3)
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#define GPIOHANDLE_REQUEST_OPEN_SOURCE (1UL << 4)
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#define GPIOHANDLE_REQUEST_BIAS_PULL_UP (1UL << 5)
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#define GPIOHANDLE_REQUEST_BIAS_PULL_DOWN (1UL << 6)
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#define GPIOHANDLE_REQUEST_BIAS_DISABLE (1UL << 7)
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/**
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* struct gpiohandle_request - Information about a GPIO handle request
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* @lineoffsets: an array of desired lines, specified by offset index for the
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* associated GPIO device
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* @flags: desired flags for the desired GPIO lines, such as
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* %GPIOHANDLE_REQUEST_OUTPUT, %GPIOHANDLE_REQUEST_ACTIVE_LOW etc, added
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* together. Note that even if multiple lines are requested, the same flags
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* must be applicable to all of them, if you want lines with individual
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* flags set, request them one by one. It is possible to select
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* a batch of input or output lines, but they must all have the same
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* characteristics, i.e. all inputs or all outputs, all active low etc
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* @default_values: if the %GPIOHANDLE_REQUEST_OUTPUT is set for a requested
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* line, this specifies the default output value, should be 0 (low) or
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* 1 (high), anything else than 0 or 1 will be interpreted as 1 (high)
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* @consumer_label: a desired consumer label for the selected GPIO line(s)
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* such as "my-bitbanged-relay"
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* @lines: number of lines requested in this request, i.e. the number of
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* valid fields in the above arrays, set to 1 to request a single line
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* @fd: if successful this field will contain a valid anonymous file handle
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* after a %GPIO_GET_LINEHANDLE_IOCTL operation, zero or negative value
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* means error
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*
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* Note: This struct is part of ABI v1 and is deprecated.
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* Use &struct gpio_v2_line_request instead.
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*/
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struct gpiohandle_request {
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__u32 lineoffsets[GPIOHANDLES_MAX];
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__u32 flags;
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__u8 default_values[GPIOHANDLES_MAX];
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char consumer_label[GPIO_MAX_NAME_SIZE];
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__u32 lines;
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int fd;
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};
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/**
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* struct gpiohandle_config - Configuration for a GPIO handle request
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* @flags: updated flags for the requested GPIO lines, such as
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* %GPIOHANDLE_REQUEST_OUTPUT, %GPIOHANDLE_REQUEST_ACTIVE_LOW etc, added
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* together
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* @default_values: if the %GPIOHANDLE_REQUEST_OUTPUT is set in flags,
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* this specifies the default output value, should be 0 (low) or
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* 1 (high), anything else than 0 or 1 will be interpreted as 1 (high)
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* @padding: reserved for future use and should be zero filled
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*
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* Note: This struct is part of ABI v1 and is deprecated.
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* Use &struct gpio_v2_line_config instead.
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*/
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struct gpiohandle_config {
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__u32 flags;
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|
__u8 default_values[GPIOHANDLES_MAX];
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|
__u32 padding[4]; /* padding for future use */
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|
};
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|
|
|
/**
|
|
* struct gpiohandle_data - Information of values on a GPIO handle
|
|
* @values: when getting the state of lines this contains the current
|
|
* state of a line, when setting the state of lines these should contain
|
|
* the desired target state
|
|
*
|
|
* Note: This struct is part of ABI v1 and is deprecated.
|
|
* Use &struct gpio_v2_line_values instead.
|
|
*/
|
|
struct gpiohandle_data {
|
|
__u8 values[GPIOHANDLES_MAX];
|
|
};
|
|
|
|
/* Eventrequest flags */
|
|
#define GPIOEVENT_REQUEST_RISING_EDGE (1UL << 0)
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|
#define GPIOEVENT_REQUEST_FALLING_EDGE (1UL << 1)
|
|
#define GPIOEVENT_REQUEST_BOTH_EDGES ((1UL << 0) | (1UL << 1))
|
|
|
|
/**
|
|
* struct gpioevent_request - Information about a GPIO event request
|
|
* @lineoffset: the desired line to subscribe to events from, specified by
|
|
* offset index for the associated GPIO device
|
|
* @handleflags: desired handle flags for the desired GPIO line, such as
|
|
* %GPIOHANDLE_REQUEST_ACTIVE_LOW or %GPIOHANDLE_REQUEST_OPEN_DRAIN
|
|
* @eventflags: desired flags for the desired GPIO event line, such as
|
|
* %GPIOEVENT_REQUEST_RISING_EDGE or %GPIOEVENT_REQUEST_FALLING_EDGE
|
|
* @consumer_label: a desired consumer label for the selected GPIO line(s)
|
|
* such as "my-listener"
|
|
* @fd: if successful this field will contain a valid anonymous file handle
|
|
* after a %GPIO_GET_LINEEVENT_IOCTL operation, zero or negative value
|
|
* means error
|
|
*
|
|
* Note: This struct is part of ABI v1 and is deprecated.
|
|
* Use &struct gpio_v2_line_request instead.
|
|
*/
|
|
struct gpioevent_request {
|
|
__u32 lineoffset;
|
|
__u32 handleflags;
|
|
__u32 eventflags;
|
|
char consumer_label[GPIO_MAX_NAME_SIZE];
|
|
int fd;
|
|
};
|
|
|
|
/*
|
|
* GPIO event types
|
|
*/
|
|
#define GPIOEVENT_EVENT_RISING_EDGE 0x01
|
|
#define GPIOEVENT_EVENT_FALLING_EDGE 0x02
|
|
|
|
/**
|
|
* struct gpioevent_data - The actual event being pushed to userspace
|
|
* @timestamp: best estimate of time of event occurrence, in nanoseconds
|
|
* @id: event identifier
|
|
*
|
|
* Note: This struct is part of ABI v1 and is deprecated.
|
|
* Use &struct gpio_v2_line_event instead.
|
|
*/
|
|
struct gpioevent_data {
|
|
__u64 timestamp;
|
|
__u32 id;
|
|
};
|
|
|
|
/*
|
|
* v1 and v2 ioctl()s
|
|
*/
|
|
#define GPIO_GET_CHIPINFO_IOCTL _IOR(0xB4, 0x01, struct gpiochip_info)
|
|
#define GPIO_GET_LINEINFO_UNWATCH_IOCTL _IOWR(0xB4, 0x0C, __u32)
|
|
|
|
/*
|
|
* v2 ioctl()s
|
|
*/
|
|
#define GPIO_V2_GET_LINEINFO_IOCTL _IOWR(0xB4, 0x05, struct gpio_v2_line_info)
|
|
#define GPIO_V2_GET_LINEINFO_WATCH_IOCTL _IOWR(0xB4, 0x06, struct gpio_v2_line_info)
|
|
#define GPIO_V2_GET_LINE_IOCTL _IOWR(0xB4, 0x07, struct gpio_v2_line_request)
|
|
#define GPIO_V2_LINE_SET_CONFIG_IOCTL _IOWR(0xB4, 0x0D, struct gpio_v2_line_config)
|
|
#define GPIO_V2_LINE_GET_VALUES_IOCTL _IOWR(0xB4, 0x0E, struct gpio_v2_line_values)
|
|
#define GPIO_V2_LINE_SET_VALUES_IOCTL _IOWR(0xB4, 0x0F, struct gpio_v2_line_values)
|
|
|
|
/*
|
|
* v1 ioctl()s
|
|
*
|
|
* These ioctl()s are deprecated. Use the v2 equivalent instead.
|
|
*/
|
|
#define GPIO_GET_LINEINFO_IOCTL _IOWR(0xB4, 0x02, struct gpioline_info)
|
|
#define GPIO_GET_LINEHANDLE_IOCTL _IOWR(0xB4, 0x03, struct gpiohandle_request)
|
|
#define GPIO_GET_LINEEVENT_IOCTL _IOWR(0xB4, 0x04, struct gpioevent_request)
|
|
#define GPIOHANDLE_GET_LINE_VALUES_IOCTL _IOWR(0xB4, 0x08, struct gpiohandle_data)
|
|
#define GPIOHANDLE_SET_LINE_VALUES_IOCTL _IOWR(0xB4, 0x09, struct gpiohandle_data)
|
|
#define GPIOHANDLE_SET_CONFIG_IOCTL _IOWR(0xB4, 0x0A, struct gpiohandle_config)
|
|
#define GPIO_GET_LINEINFO_WATCH_IOCTL _IOWR(0xB4, 0x0B, struct gpioline_info)
|
|
|
|
#endif /* _UAPI_GPIO_H_ */
|