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528 lines
19 KiB
528 lines
19 KiB
/* 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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/** |
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* struct gpiohandle_data - Information of values on a GPIO handle |
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* @values: when getting the state of lines this contains the current |
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* state of a line, when setting the state of lines these should contain |
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* the desired target state |
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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_values instead. |
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*/ |
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struct gpiohandle_data { |
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__u8 values[GPIOHANDLES_MAX]; |
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}; |
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/* Eventrequest flags */ |
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#define GPIOEVENT_REQUEST_RISING_EDGE (1UL << 0) |
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#define GPIOEVENT_REQUEST_FALLING_EDGE (1UL << 1) |
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#define GPIOEVENT_REQUEST_BOTH_EDGES ((1UL << 0) | (1UL << 1)) |
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|
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/** |
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* struct gpioevent_request - Information about a GPIO event request |
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* @lineoffset: the desired line to subscribe to events from, specified by |
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* offset index for the associated GPIO device |
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* @handleflags: desired handle flags for the desired GPIO line, such as |
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* %GPIOHANDLE_REQUEST_ACTIVE_LOW or %GPIOHANDLE_REQUEST_OPEN_DRAIN |
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* @eventflags: desired flags for the desired GPIO event line, such as |
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* %GPIOEVENT_REQUEST_RISING_EDGE or %GPIOEVENT_REQUEST_FALLING_EDGE |
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* @consumer_label: a desired consumer label for the selected GPIO line(s) |
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* such as "my-listener" |
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* @fd: if successful this field will contain a valid anonymous file handle |
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* after a %GPIO_GET_LINEEVENT_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 gpioevent_request { |
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__u32 lineoffset; |
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__u32 handleflags; |
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__u32 eventflags; |
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char consumer_label[GPIO_MAX_NAME_SIZE]; |
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int fd; |
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}; |
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|
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/* |
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* GPIO event types |
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*/ |
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#define GPIOEVENT_EVENT_RISING_EDGE 0x01 |
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#define GPIOEVENT_EVENT_FALLING_EDGE 0x02 |
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/** |
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* struct gpioevent_data - The actual event being pushed to userspace |
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* @timestamp: best estimate of time of event occurrence, in nanoseconds |
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* @id: event identifier |
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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_event instead. |
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*/ |
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struct gpioevent_data { |
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__u64 timestamp; |
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__u32 id; |
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}; |
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/* |
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* v1 and v2 ioctl()s |
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*/ |
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#define GPIO_GET_CHIPINFO_IOCTL _IOR(0xB4, 0x01, struct gpiochip_info) |
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#define GPIO_GET_LINEINFO_UNWATCH_IOCTL _IOWR(0xB4, 0x0C, __u32) |
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/* |
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* v2 ioctl()s |
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*/ |
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#define GPIO_V2_GET_LINEINFO_IOCTL _IOWR(0xB4, 0x05, struct gpio_v2_line_info) |
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#define GPIO_V2_GET_LINEINFO_WATCH_IOCTL _IOWR(0xB4, 0x06, struct gpio_v2_line_info) |
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#define GPIO_V2_GET_LINE_IOCTL _IOWR(0xB4, 0x07, struct gpio_v2_line_request) |
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#define GPIO_V2_LINE_SET_CONFIG_IOCTL _IOWR(0xB4, 0x0D, struct gpio_v2_line_config) |
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#define GPIO_V2_LINE_GET_VALUES_IOCTL _IOWR(0xB4, 0x0E, struct gpio_v2_line_values) |
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#define GPIO_V2_LINE_SET_VALUES_IOCTL _IOWR(0xB4, 0x0F, struct gpio_v2_line_values) |
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/* |
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* v1 ioctl()s |
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* |
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* These ioctl()s are deprecated. Use the v2 equivalent instead. |
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*/ |
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#define GPIO_GET_LINEINFO_IOCTL _IOWR(0xB4, 0x02, struct gpioline_info) |
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#define GPIO_GET_LINEHANDLE_IOCTL _IOWR(0xB4, 0x03, struct gpiohandle_request) |
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#define GPIO_GET_LINEEVENT_IOCTL _IOWR(0xB4, 0x04, struct gpioevent_request) |
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#define GPIOHANDLE_GET_LINE_VALUES_IOCTL _IOWR(0xB4, 0x08, struct gpiohandle_data) |
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#define GPIOHANDLE_SET_LINE_VALUES_IOCTL _IOWR(0xB4, 0x09, struct gpiohandle_data) |
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#define GPIOHANDLE_SET_CONFIG_IOCTL _IOWR(0xB4, 0x0A, struct gpiohandle_config) |
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#define GPIO_GET_LINEINFO_WATCH_IOCTL _IOWR(0xB4, 0x0B, struct gpioline_info) |
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#endif /* _UAPI_GPIO_H_ */
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