/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */ /* * <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 … /** * 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 { … }; /* * 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 … /* * The maximum number of configuration attributes associated with a line * request. */ #define GPIO_V2_LINE_NUM_ATTRS_MAX … /** * 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 * the hardware timestamping engine (HTE) subsystem */ enum gpio_v2_line_flag { … }; /** * 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 { … }; /** * 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 { … }; /** * struct gpio_v2_line_attribute - a configurable attribute of a line * @id: attribute identifier with value from &enum gpio_v2_line_attr_id * @padding: reserved for future use and must be zero filled * @flags: if id is %GPIO_V2_LINE_ATTR_ID_FLAGS, the flags for the GPIO * line, with values from &enum gpio_v2_line_flag, such as * %GPIO_V2_LINE_FLAG_ACTIVE_LOW, %GPIO_V2_LINE_FLAG_OUTPUT etc, added * together. This overrides the default flags contained in the &struct * gpio_v2_line_config for the associated line. * @values: if id is %GPIO_V2_LINE_ATTR_ID_OUTPUT_VALUES, a bitmap * containing the values to which the lines will be set, with each bit * number corresponding to the index into &struct * gpio_v2_line_request.offsets * @debounce_period_us: if id is %GPIO_V2_LINE_ATTR_ID_DEBOUNCE, the * desired debounce period, in microseconds */ struct gpio_v2_line_attribute { … }; /** * struct gpio_v2_line_config_attribute - a configuration attribute * associated with one or more of the requested lines. * @attr: the configurable attribute * @mask: a bitmap identifying the lines to which the attribute applies, * with each bit number corresponding to the index into &struct * gpio_v2_line_request.offsets */ struct gpio_v2_line_config_attribute { … }; /** * struct gpio_v2_line_config - Configuration for GPIO lines * @flags: flags for the GPIO lines, with values from &enum * gpio_v2_line_flag, such as %GPIO_V2_LINE_FLAG_ACTIVE_LOW, * %GPIO_V2_LINE_FLAG_OUTPUT etc, added together. This is the default for * all requested lines but may be overridden for particular lines using * @attrs. * @num_attrs: the number of attributes in @attrs * @padding: reserved for future use and must be zero filled * @attrs: the configuration attributes associated with the requested * lines. Any attribute should only be associated with a particular line * once. If an attribute is associated with a line multiple times then the * first occurrence (i.e. lowest index) has precedence. */ struct gpio_v2_line_config { … }; /** * struct gpio_v2_line_request - Information about a request for GPIO lines * @offsets: an array of desired lines, specified by offset index for the * associated GPIO chip * @consumer: a desired consumer label for the selected GPIO lines such as * "my-bitbanged-relay" * @config: requested configuration for the lines * @num_lines: number of lines requested in this request, i.e. the number * of valid fields in the %GPIO_V2_LINES_MAX sized arrays, set to 1 to * request a single line * @event_buffer_size: a suggested minimum number of line events that the * kernel should buffer. This is only relevant if edge detection is * enabled in the configuration. Note that this is only a suggested value * and the kernel may allocate a larger buffer or cap the size of the * buffer. If this field is zero then the buffer size defaults to a minimum * of @num_lines * 16. * @padding: reserved for future use and must be zero filled * @fd: after a successful %GPIO_V2_GET_LINE_IOCTL operation, contains * a valid anonymous file descriptor representing the request */ struct gpio_v2_line_request { … }; /** * struct gpio_v2_line_info - Information about a certain GPIO line * @name: the name of this GPIO line, such as the output pin of the line on * the chip, a rail or a pin header name on a board, as specified by the * GPIO chip, may be empty (i.e. name[0] == '\0') * @consumer: a functional name for the consumer of this GPIO line as set * by whatever is using it, will be empty if there is no current user but * may also be empty if the consumer doesn't set this up * @offset: the local offset on this GPIO chip, fill this in when * requesting the line information from the kernel * @num_attrs: the number of attributes in @attrs * @flags: flags for this GPIO line, with values from &enum * gpio_v2_line_flag, such as %GPIO_V2_LINE_FLAG_ACTIVE_LOW, * %GPIO_V2_LINE_FLAG_OUTPUT etc, added together * @attrs: the configuration attributes associated with the line * @padding: reserved for future use */ struct gpio_v2_line_info { … }; /** * enum gpio_v2_line_changed_type - &struct gpio_v2_line_changed.event_type * values * @GPIO_V2_LINE_CHANGED_REQUESTED: line has been requested * @GPIO_V2_LINE_CHANGED_RELEASED: line has been released * @GPIO_V2_LINE_CHANGED_CONFIG: line has been reconfigured */ enum gpio_v2_line_changed_type { … }; /** * struct gpio_v2_line_info_changed - Information about a change in status * of a GPIO line * @info: updated line information * @timestamp_ns: estimate of time of status change occurrence, in nanoseconds * @event_type: the type of change with a value from &enum * gpio_v2_line_changed_type * @padding: reserved for future use */ struct gpio_v2_line_info_changed { … }; /** * enum gpio_v2_line_event_id - &struct gpio_v2_line_event.id values * @GPIO_V2_LINE_EVENT_RISING_EDGE: event triggered by a rising edge * @GPIO_V2_LINE_EVENT_FALLING_EDGE: event triggered by a falling edge */ enum gpio_v2_line_event_id { … }; /** * struct gpio_v2_line_event - The actual event being pushed to userspace * @timestamp_ns: best estimate of time of event occurrence, in nanoseconds * @id: event identifier with value from &enum gpio_v2_line_event_id * @offset: the offset of the line that triggered the event * @seqno: the sequence number for this event in the sequence of events for * all the lines in this line request * @line_seqno: the sequence number for this event in the sequence of * events on this particular line * @padding: reserved for future use * * By default the @timestamp_ns is read from %CLOCK_MONOTONIC and is * intended to allow the accurate measurement of the time between events. * It does not provide the wall-clock time. * * If the %GPIO_V2_LINE_FLAG_EVENT_CLOCK_REALTIME flag is set then the * @timestamp_ns is read from %CLOCK_REALTIME. * * If the %GPIO_V2_LINE_FLAG_EVENT_CLOCK_HTE flag is set then the * @timestamp_ns is provided by the hardware timestamping engine (HTE) * subsystem. */ struct gpio_v2_line_event { … }; /* * ABI v1 * * This version of the ABI is deprecated. * Use the latest version of the ABI, defined above, instead. */ /* Informational flags */ #define GPIOLINE_FLAG_KERNEL … #define GPIOLINE_FLAG_IS_OUT … #define GPIOLINE_FLAG_ACTIVE_LOW … #define GPIOLINE_FLAG_OPEN_DRAIN … #define GPIOLINE_FLAG_OPEN_SOURCE … #define GPIOLINE_FLAG_BIAS_PULL_UP … #define GPIOLINE_FLAG_BIAS_PULL_DOWN … #define GPIOLINE_FLAG_BIAS_DISABLE … /** * struct gpioline_info - Information about a certain GPIO line * @line_offset: the local offset on this GPIO device, fill this in when * requesting the line information from the kernel * @flags: various flags for this line * @name: the name of this GPIO line, such as the output pin of the line on the * chip, a rail or a pin header name on a board, as specified by the gpio * chip, may be empty (i.e. name[0] == '\0') * @consumer: a functional name for the consumer of this GPIO line as set by * whatever is using it, will be empty if there is no current user but may * also be empty if the consumer doesn't set this up * * Note: This struct is part of ABI v1 and is deprecated. * Use ABI v2 and &struct gpio_v2_line_info instead. */ struct gpioline_info { … }; /* Maximum number of requested handles */ #define GPIOHANDLES_MAX … /* Possible line status change events */ enum { … }; /** * struct gpioline_info_changed - Information about a change in status * of a GPIO line * @info: updated line information * @timestamp: estimate of time of status change occurrence, in nanoseconds * @event_type: one of %GPIOLINE_CHANGED_REQUESTED, * %GPIOLINE_CHANGED_RELEASED and %GPIOLINE_CHANGED_CONFIG * @padding: reserved for future use * * The &struct gpioline_info embedded here has 32-bit alignment on its own, * but it works fine with 64-bit alignment too. With its 72 byte size, we can * guarantee there are no implicit holes between it and subsequent members. * The 20-byte padding at the end makes sure we don't add any implicit padding * at the end of the structure on 64-bit architectures. * * Note: This struct is part of ABI v1 and is deprecated. * Use ABI v2 and &struct gpio_v2_line_info_changed instead. */ struct gpioline_info_changed { … }; /* Linerequest flags */ #define GPIOHANDLE_REQUEST_INPUT … #define GPIOHANDLE_REQUEST_OUTPUT … #define GPIOHANDLE_REQUEST_ACTIVE_LOW … #define GPIOHANDLE_REQUEST_OPEN_DRAIN … #define GPIOHANDLE_REQUEST_OPEN_SOURCE … #define GPIOHANDLE_REQUEST_BIAS_PULL_UP … #define GPIOHANDLE_REQUEST_BIAS_PULL_DOWN … #define GPIOHANDLE_REQUEST_BIAS_DISABLE … /** * struct gpiohandle_request - Information about a GPIO handle request * @lineoffsets: an array of desired lines, specified by offset index for the * associated GPIO device * @flags: desired flags for the desired GPIO lines, such as * %GPIOHANDLE_REQUEST_OUTPUT, %GPIOHANDLE_REQUEST_ACTIVE_LOW etc, added * together. Note that even if multiple lines are requested, the same flags * must be applicable to all of them, if you want lines with individual * flags set, request them one by one. It is possible to select * a batch of input or output lines, but they must all have the same * characteristics, i.e. all inputs or all outputs, all active low etc * @default_values: if the %GPIOHANDLE_REQUEST_OUTPUT is set for a requested * line, this specifies the default output value, should be 0 (inactive) or * 1 (active). Anything other than 0 or 1 will be interpreted as active. * @consumer_label: a desired consumer label for the selected GPIO line(s) * such as "my-bitbanged-relay" * @lines: number of lines requested in this request, i.e. the number of * valid fields in the above arrays, set to 1 to request a single line * @fd: after a successful %GPIO_GET_LINEHANDLE_IOCTL operation, contains * a valid anonymous file descriptor representing the request * * Note: This struct is part of ABI v1 and is deprecated. * Use ABI v2 and &struct gpio_v2_line_request instead. */ struct gpiohandle_request { … }; /** * struct gpiohandle_config - Configuration for a GPIO handle request * @flags: updated flags for the requested GPIO lines, such as * %GPIOHANDLE_REQUEST_OUTPUT, %GPIOHANDLE_REQUEST_ACTIVE_LOW etc, added * together * @default_values: if the %GPIOHANDLE_REQUEST_OUTPUT is set in flags, * this specifies the default output value, should be 0 (inactive) or * 1 (active). Anything other than 0 or 1 will be interpreted as active. * @padding: reserved for future use and should be zero filled * * Note: This struct is part of ABI v1 and is deprecated. * Use ABI v2 and &struct gpio_v2_line_config instead. */ struct gpiohandle_config { … }; /** * 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. States are 0 (inactive) or 1 (active). * When setting, anything other than 0 or 1 will be interpreted as active. * * Note: This struct is part of ABI v1 and is deprecated. * Use ABI v2 and &struct gpio_v2_line_values instead. */ struct gpiohandle_data { … }; /* Eventrequest flags */ #define GPIOEVENT_REQUEST_RISING_EDGE … #define GPIOEVENT_REQUEST_FALLING_EDGE … #define GPIOEVENT_REQUEST_BOTH_EDGES … /** * 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: after a successful %GPIO_GET_LINEEVENT_IOCTL operation, contains a * valid anonymous file descriptor representing the request * * Note: This struct is part of ABI v1 and is deprecated. * Use ABI v2 and &struct gpio_v2_line_request instead. */ struct gpioevent_request { … }; /* * GPIO event types */ #define GPIOEVENT_EVENT_RISING_EDGE … #define GPIOEVENT_EVENT_FALLING_EDGE … /** * struct gpioevent_data - The actual event being pushed to userspace * @timestamp: best estimate of time of event occurrence, in nanoseconds * @id: event identifier, one of %GPIOEVENT_EVENT_RISING_EDGE or * %GPIOEVENT_EVENT_FALLING_EDGE * * Note: This struct is part of ABI v1 and is deprecated. * Use ABI v2 and &struct gpio_v2_line_event instead. */ struct gpioevent_data { … }; /* * v1 and v2 ioctl()s */ #define GPIO_GET_CHIPINFO_IOCTL … #define GPIO_GET_LINEINFO_UNWATCH_IOCTL … /* * v2 ioctl()s */ #define GPIO_V2_GET_LINEINFO_IOCTL … #define GPIO_V2_GET_LINEINFO_WATCH_IOCTL … #define GPIO_V2_GET_LINE_IOCTL … #define GPIO_V2_LINE_SET_CONFIG_IOCTL … #define GPIO_V2_LINE_GET_VALUES_IOCTL … #define GPIO_V2_LINE_SET_VALUES_IOCTL … /* * v1 ioctl()s * * These ioctl()s are deprecated. Use the v2 equivalent instead. */ #define GPIO_GET_LINEINFO_IOCTL … #define GPIO_GET_LINEHANDLE_IOCTL … #define GPIO_GET_LINEEVENT_IOCTL … #define GPIOHANDLE_GET_LINE_VALUES_IOCTL … #define GPIOHANDLE_SET_LINE_VALUES_IOCTL … #define GPIOHANDLE_SET_CONFIG_IOCTL … #define GPIO_GET_LINEINFO_WATCH_IOCTL … #endif /* _UAPI_GPIO_H_ */
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