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source | linux | ======================
FunctionFS Descriptors
======================
Some of the descriptors that can be written to the FFS gadget are
described below. Device and configuration descriptors are handled
by the composite gadget and are not written by the user to the
FFS gadget.
Descriptors are written to the "ep0" file ... | Documentation/usb/functionfs-desc.rst | null | null | null | null | null |
source | linux | ====================
How FunctionFS works
====================
Overview
========
From kernel point of view it is just a composite function with some
unique behaviour. It may be added to an USB configuration only after
the user space driver has registered by writing descriptors and
strings (the user space program has... | Documentation/usb/functionfs.rst | null | null | null | null | null |
source | linux | ==============
Gadget Testing
==============
This file summarizes information on basic testing of USB functions
provided by gadgets.
.. contents
1. ACM function
2. ECM function
3. ECM subset function
4. EEM function
5. FFS function
6. HID function
7. LOOPBACK function
8. MASS STORAGE function... | Documentation/usb/gadget-testing.rst | null | null | null | null | null |
source | linux | ============================================
Linux USB gadget configured through configfs
============================================
25th April 2013
Overview
========
A USB Linux Gadget is a device which has a UDC (USB Device Controller) and can
be connected to a USB Host to extend it with additional functions... | Documentation/usb/gadget_configfs.rst | null | null | null | null | null |
source | linux | ===========================
Linux USB HID gadget driver
===========================
Introduction
============
The HID Gadget driver provides emulation of USB Human Interface
Devices (HID). The basic HID handling is done in the kernel,
and HID reports can be sent/received through I/O on the
/dev/hidgX character device... | Documentation/usb/gadget_hid.rst | null | null | null | null | null |
source | linux | ==============================
Multifunction Composite Gadget
==============================
Overview
========
The Multifunction Composite Gadget (or g_multi) is a composite gadget
that makes extensive use of the composite framework to provide
a... multifunction gadget.
In its standard configuration it provides a si... | Documentation/usb/gadget_multi.rst | null | null | null | null | null |
source | linux | ===============================
Linux USB Printer Gadget Driver
===============================
06/04/2007
Copyright (C) 2007 Craig W. Nadler <craig@nadler.us>
General
=======
This driver may be used if you are writing printer firmware using Linux as
the embedded OS. This driver has nothing to do with using a pri... | Documentation/usb/gadget_printer.rst | null | null | null | null | null |
source | linux | ===============================
Linux Gadget Serial Driver v2.0
===============================
11/20/2004
(updated 8-May-2008 for v2.3)
License and Disclaimer
----------------------
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
publishe... | Documentation/usb/gadget_serial.rst | null | null | null | null | null |
source | linux | =======================
Linux UVC Gadget Driver
=======================
Overview
--------
The UVC Gadget driver is a driver for hardware on the *device* side of a USB
connection. It is intended to run on a Linux system that has USB device-side
hardware such as boards with an OTG port.
On the device system, once the d... | Documentation/usb/gadget_uvc.rst | null | null | null | null | null |
source | linux | ===========
USB support
===========
.. toctree::
:maxdepth: 1
acm
authorization
chipidea
dwc3
ehci
functionfs
functionfs-desc
gadget_configfs
gadget_hid
gadget_multi
gadget_printer
gadget_serial
gadget_uvc
gadget-testing
iuu_phoenix
mass-storage
... | Documentation/usb/index.rst | null | null | null | null | null |
source | linux | =============================
Infinity Usb Unlimited Readme
=============================
Hi all,
This module provide a serial interface to use your
IUU unit in phoenix mode. Loading this module will
bring a ttyUSB[0-x] interface. This driver must be
used by your favorite application to pilot the IUU
This driver is... | Documentation/usb/iuu_phoenix.rst | null | null | null | null | null |
source | linux | =========================
Mass Storage Gadget (MSG)
=========================
Overview
========
Mass Storage Gadget (or MSG) acts as a USB Mass Storage device,
appearing to the host as a disk or a CD-ROM drive. It supports
multiple logical units (LUNs). Backing storage for each LUN is
provided by a regular ... | Documentation/usb/mass-storage.rst | null | null | null | null | null |
source | linux | =============================
USB 7-Segment Numeric Display
=============================
Manufactured by Delcom Engineering
Device Information
------------------
USB VENDOR_ID 0x0fc5
USB PRODUCT_ID 0x1227
Both the 6 character and 8 character displays have PRODUCT_ID,
and according to Delcom Engineering no queryable ... | Documentation/usb/misc_usbsevseg.rst | null | null | null | null | null |
source | linux | ================
mtouchusb driver
================
Changes
=======
- 0.3 - Created based off of scanner & INSTALL from the original touchscreen
driver on freecode (http://freecode.com/projects/3mtouchscreendriver)
- Amended for linux-2.4.18, then 2.4.19
- 0.5 - Complete rewrite using Linux Input in 2.6.3
Unfortu... | Documentation/usb/mtouchusb.rst | null | null | null | null | null |
source | linux | ====
OHCI
====
23-Aug-2002
The "ohci-hcd" driver is a USB Host Controller Driver (HCD) that is derived
from the "usb-ohci" driver from the 2.4 kernel series. The "usb-ohci" code
was written primarily by Roman Weissgaerber <weissg@vienna.at> but with
contributions from many others (read its copyright/licencing header... | Documentation/usb/ohci.rst | null | null | null | null | null |
source | linux | ==============
USB Raw Gadget
==============
USB Raw Gadget is a gadget driver that gives userspace low-level control over
the gadget's communication process.
Like any other gadget driver, Raw Gadget implements USB devices via the
USB gadget API. Unlike most gadget drivers, Raw Gadget does not implement
any concrete ... | Documentation/usb/raw-gadget.rst | null | null | null | null | null |
source | linux | Linux CDC ACM inf
-----------------
.. include:: linux-cdc-acm.inf
:literal:
Linux inf
---------
.. include:: linux.inf
:literal:
USB devfs drop permissions source
---------------------------------
.. literalinclude:: usbdevfs-drop-permissions.c
:language: c
Credits
-------
.. include:: CREDITS
:... | Documentation/usb/text_files.rst | null | null | null | null | null |
source | linux | ==============
USB references
==============
2008-Mar-7
For USB help other than the readme files that are located in
`Documentation/usb/*`, see the following:
- Linux-USB project: http://www.linux-usb.org
mirrors at http://usb.in.tum.de/linux-usb/
and http://it.linux-usb.org
- Linux USB... | Documentation/usb/usb-help.rst | null | null | null | null | null |
source | linux | ==========
USB serial
==========
Introduction
============
The USB serial driver currently supports a number of different USB to
serial converter products, as well as some devices that use a serial
interface from userspace to talk to the device.
See the individual product section below for specific informati... | Documentation/usb/usb-serial.rst | null | null | null | null | null |
source | linux | #include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <inttypes.h>
#include <unistd.h>
#include <linux/usbdevice_fs.h>
/* For building without an updated set of headers */
#ifndef USBDEVFS_DROP_PRIVILEGES
#define USBDE... | Documentation/usb/usbdevfs-drop-permissions.c | null | null | null | null | null |
source | linux | ===============
USB/IP protocol
===============
Architecture
============
The USB/IP protocol follows a server/client architecture. The server exports the
USB devices and the clients import them. The device driver for the exported
USB device runs on the client machine.
The client may ask for the list of the exported... | Documentation/usb/usbip_protocol.rst | null | null | null | null | null |
source | linux | ======
usbmon
======
Introduction
============
The name "usbmon" in lowercase refers to a facility in kernel which is
used to collect traces of I/O on the USB bus. This function is analogous
to a packet socket used by network monitoring tools such as tcpdump(1)
or Ethereal. Similarly, it is expected that a tool such ... | Documentation/usb/usbmon.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
=================================
Linux-specific ELF idiosyncrasies
=================================
Definitions
===========
"First" program header is the one with the smallest offset in the file:
e_phoff.
"Last" program header is the one with the biggest offset in the file:
e_p... | Documentation/userspace-api/ELF.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. Copyright © 2024 Microsoft Corporation
===================
Executability check
===================
The ``AT_EXECVE_CHECK`` :manpage:`execveat(2)` flag, and the
``SECBIT_EXEC_RESTRICT_FILE`` and ``SECBIT_EXEC_DENY_INTERACTIVE`` securebits
are intended for script interpreters and ... | Documentation/userspace-api/check_exec.rst | null | null | null | null | null |
source | linux | ===================================
Dell Systems Management Base Driver
===================================
Overview
========
The Dell Systems Management Base Driver provides a sysfs interface for
systems management software such as Dell OpenManage to perform system
management interrupts and host control actions (sys... | Documentation/userspace-api/dcdbas.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. Copyright 2021-2023 Collabora Ltd.
========================
Exchanging pixel buffers
========================
As originally designed, the Linux graphics subsystem had extremely limited
support for sharing pixel-buffer allocations between processes, devices, and
subsystems. Moder... | Documentation/userspace-api/dma-buf-alloc-exchange.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
==============================
Allocating dma-buf using heaps
==============================
Dma-buf Heaps are a way for userspace to allocate dma-buf objects. They are
typically used to allocate buffers from a specific allocation pool, or to share
buffers across frameworks.
Heaps... | Documentation/userspace-api/dma-buf-heaps.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
======
futex2
======
:Author: André Almeida <andrealmeid@collabora.com>
futex, or fast user mutex, is a set of syscalls to allow userspace to create
performant synchronization mechanisms, such as mutexes, semaphores and
conditional variables in userspace. C standard libraries, lik... | Documentation/userspace-api/futex2.rst | null | null | null | null | null |
source | linux | =====================================
The Linux kernel user-space API guide
=====================================
.. _man-pages: https://www.kernel.org/doc/man-pages/
While much of the kernel's user-space API is documented elsewhere
(particularly in the man-pages_ project), some user-space information can
also be fou... | Documentation/userspace-api/index.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0+
=======
IOMMUFD
=======
:Author: Jason Gunthorpe
:Author: Kevin Tian
Overview
========
IOMMUFD is the user API to control the IOMMU subsystem as it relates to managing
IO page tables from userspace using file descriptors. It intends to be general
and consumable by any driver tha... | Documentation/userspace-api/iommufd.rst | null | null | null | null | null |
source | linux | =======================
ISA Plug & Play support
=======================
Interface /proc/isapnp
======================
The interface was removed in kernel 2.5.53. See pnp.rst for more details.
Interface /proc/bus/isapnp
==========================
This directory allows access to ISA PnP cards and logical devices.
The... | Documentation/userspace-api/isapnp.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. Copyright © 2017-2020 Mickaël Salaün <mic@digikod.net>
.. Copyright © 2019-2020 ANSSI
.. Copyright © 2021-2022 Microsoft Corporation
=====================================
Landlock: unprivileged access control
=====================================
:Author: Mickaël Salaün
:Date: J... | Documentation/userspace-api/landlock.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
================
Live Update uAPI
================
:Author: Pasha Tatashin <pasha.tatashin@soleen.com>
ioctl interface
===============
.. kernel-doc:: kernel/liveupdate/luo_core.c
:doc: LUO ioctl Interface
ioctl uAPI
===========
.. kernel-doc:: include/uapi/linux/liveupdate.h
... | Documentation/userspace-api/liveupdate.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. Copyright (C) 2022 Casey Schaufler <casey@schaufler-ca.com>
.. Copyright (C) 2022 Intel Corporation
=====================================
Linux Security Modules
=====================================
:Author: Casey Schaufler
:Date: July 2023
Linux security modules (LSM) provide ... | Documentation/userspace-api/lsm.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
==================================
Introduction of non-executable mfd
==================================
:Author:
Daniel Verkamp <dverkamp@chromium.org>
Jeff Xu <jeffxu@chromium.org>
:Contributor:
Aleksa Sarai <cyphar@cyphar.com>
Since Linux introduced the memfd feature, ... | Documentation/userspace-api/mfd_noexec.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
=====================
Introduction of mseal
=====================
:Author: Jeff Xu <jeffxu@chromium.org>
Modern CPUs support memory permissions such as RW and NX bits. The memory
permission feature improves security stance on memory corruption bugs, i.e.
the attacker can’t just wr... | Documentation/userspace-api/mseal.rst | null | null | null | null | null |
source | linux | ======================
No New Privileges Flag
======================
The execve system call can grant a newly-started program privileges that
its parent did not have. The most obvious examples are setuid/setgid
programs and file capabilities. To prevent the parent program from
gaining these privileges as well, the k... | Documentation/userspace-api/no_new_privs.rst | null | null | null | null | null |
source | linux | ===================================
NT synchronization primitive driver
===================================
This page documents the user-space API for the ntsync driver.
ntsync is a support driver for emulation of NT synchronization
primitives by user-space NT emulators. It exists because implementation
in user-space... | Documentation/userspace-api/ntsync.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
================
Perf ring buffer
================
.. CONTENTS
1. Introduction
2. Ring buffer implementation
2.1 Basic algorithm
2.2 Ring buffer for different tracing modes
2.2.1 Default mode
2.2.2 Per-thread mode
2.2.3 Per-CPU mode... | Documentation/userspace-api/perf_ring_buffer.rst | null | null | null | null | null |
source | linux | =====================
Restartable Sequences
=====================
Restartable Sequences allow to register a per thread userspace memory area
to be used as an ABI between kernel and userspace for three purposes:
* userspace restartable sequences
* quick access to read the current CPU number, node ID from userspace
... | Documentation/userspace-api/rseq.rst | null | null | null | null | null |
source | linux | ===========================================
Seccomp BPF (SECure COMPuting with filters)
===========================================
Introduction
============
A large number of system calls are exposed to every userland process
with many of them going unused for the entire lifetime of the process.
As system calls chan... | Documentation/userspace-api/seccomp_filter.rst | null | null | null | null | null |
source | linux | ===================
Speculation Control
===================
Quite some CPUs have speculation-related misfeatures which are in
fact vulnerabilities causing data leaks in various forms even across
privilege domains.
The kernel provides mitigation for such vulnerabilities in various
forms. Some of these mitigations are ... | Documentation/userspace-api/spec_ctrl.rst | null | null | null | null | null |
source | linux | =====================================================================
Platform Profile Selection (e.g. /sys/firmware/acpi/platform_profile)
=====================================================================
On modern systems the platform performance, temperature, fan and other
hardware related characteristics are o... | Documentation/userspace-api/sysfs-platform_profile.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. tee:
==================================================
TEE (Trusted Execution Environment) Userspace API
==================================================
include/uapi/linux/tee.h defines the generic interface to a TEE.
User space (the client) connects to the driver by openin... | Documentation/userspace-api/tee.rst | null | null | null | null | null |
source | linux | unshare system call
===================
This document describes the new system call, unshare(). The document
provides an overview of the feature, why it is needed, how it can
be used, its interface specification, design, implementation and
how it can be tested.
Change Log
----------
version 0.1 Initial document, Jan... | Documentation/userspace-api/unshare.rst | null | null | null | null | null |
source | linux | ==================================
VDUSE - "vDPA Device in Userspace"
==================================
vDPA (virtio data path acceleration) device is a device that uses a
datapath which complies with the virtio specifications with vendor
specific control path. vDPA devices can be both physically located on
the hardw... | Documentation/userspace-api/vduse.rst | null | null | null | null | null |
source | linux | ========================================================
OpenCAPI (Open Coherent Accelerator Processor Interface)
========================================================
OpenCAPI is an interface between processors and accelerators. It aims
at being low-latency and high-bandwidth.
The specification was developed by t... | Documentation/userspace-api/accelerators/ocxl.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
eBPF Userspace API
==================
eBPF is a kernel mechanism to provide a sandboxed runtime environment in the
Linux kernel for runtime extension and instrumentation without changing kernel
source code or loading kernel modules. eBPF programs can be attached to various
kernel s... | Documentation/userspace-api/ebpf/index.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
eBPF Syscall
------------
:Authors: - Alexei Starovoitov <ast@kernel.org>
- Joe Stringer <joe@wand.net.nz>
- Michael Kerrisk <mtk.manpages@gmail.com>
The primary info for the bpf syscall is available in the `man-pages`_
for `bpf(2)`_.
bpf() subcommand referenc... | Documentation/userspace-api/ebpf/syscall.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
================
fwctl cxl driver
================
:Author: Dave Jiang
Overview
========
The CXL spec defines a set of commands that can be issued to the mailbox of a
CXL device or switch. It also left room for vendor specific commands to be
issued to the mailbox as well. fwctl p... | Documentation/userspace-api/fwctl/fwctl-cxl.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
===============
fwctl subsystem
===============
:Author: Jason Gunthorpe
Overview
========
Modern devices contain extensive amounts of FW, and in many cases, are largely
software-defined pieces of hardware. The evolution of this approach is largely a
reaction to Moore's Law where... | Documentation/userspace-api/fwctl/fwctl.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
Firmware Control (FWCTL) Userspace API
======================================
A framework that define a common set of limited rules that allows user space
to securely construct and execute RPCs inside device firmware.
.. toctree::
:maxdepth: 1
fwctl
fwctl-cxl
pds_fwct... | Documentation/userspace-api/fwctl/index.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
================
fwctl pds driver
================
:Author: Shannon Nelson
Overview
========
The PDS Core device makes a fwctl service available through an
auxiliary_device named pds_core.fwctl.N. The pds_fwctl driver binds to
this device and registers itself with the fwctl subs... | Documentation/userspace-api/fwctl/pds_fwctl.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
===================================
GPIO Character Device Userspace API
===================================
This is latest version (v2) of the character device API, as defined in
``include/uapi/linux/gpio.h.``
First added in 5.10.
.. note::
Do NOT abuse userspace APIs to contr... | Documentation/userspace-api/gpio/chardev.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
========================================
GPIO Character Device Userspace API (v1)
========================================
.. warning::
This API is obsoleted by chardev.rst (v2).
New developments should use the v2 API, and existing developments are
encouraged to migrate a... | Documentation/userspace-api/gpio/chardev_v1.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. _gpio_errors:
*******************
GPIO Error Codes
*******************
.. _gpio-errors:
.. tabularcolumns:: |p{2.5cm}|p{15.0cm}|
.. flat-table:: Common GPIO error codes
:header-rows: 0
:stub-columns: 0
:widths: 1 16
- - ``EAGAIN`` (aka ``EWOULDBLOCK``)
... | Documentation/userspace-api/gpio/error-codes.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. _GPIO_GET_CHIPINFO_IOCTL:
***********************
GPIO_GET_CHIPINFO_IOCTL
***********************
Name
====
GPIO_GET_CHIPINFO_IOCTL - Get the publicly available information for a chip.
Synopsis
========
.. c:macro:: GPIO_GET_CHIPINFO_IOCTL
``int ioctl(int chip_fd, GPIO_GET_... | Documentation/userspace-api/gpio/gpio-get-chipinfo-ioctl.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. _GPIO_GET_LINEEVENT_IOCTL:
************************
GPIO_GET_LINEEVENT_IOCTL
************************
.. warning::
This ioctl is part of chardev_v1.rst and is obsoleted by
gpio-v2-get-line-ioctl.rst.
Name
====
GPIO_GET_LINEEVENT_IOCTL - Request a line with edge detect... | Documentation/userspace-api/gpio/gpio-get-lineevent-ioctl.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. _GPIO_GET_LINEHANDLE_IOCTL:
*************************
GPIO_GET_LINEHANDLE_IOCTL
*************************
.. warning::
This ioctl is part of chardev_v1.rst and is obsoleted by
gpio-v2-get-line-ioctl.rst.
Name
====
GPIO_GET_LINEHANDLE_IOCTL - Request a line or lines fr... | Documentation/userspace-api/gpio/gpio-get-linehandle-ioctl.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. _GPIO_GET_LINEINFO_IOCTL:
***********************
GPIO_GET_LINEINFO_IOCTL
***********************
.. warning::
This ioctl is part of chardev_v1.rst and is obsoleted by
gpio-v2-get-lineinfo-ioctl.rst.
Name
====
GPIO_GET_LINEINFO_IOCTL - Get the publicly available infor... | Documentation/userspace-api/gpio/gpio-get-lineinfo-ioctl.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. _GPIO_GET_LINEINFO_UNWATCH_IOCTL:
*******************************
GPIO_GET_LINEINFO_UNWATCH_IOCTL
*******************************
Name
====
GPIO_GET_LINEINFO_UNWATCH_IOCTL - Disable watching a line for changes to its
requested state and configuration information.
Synopsis
===... | Documentation/userspace-api/gpio/gpio-get-lineinfo-unwatch-ioctl.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. _GPIO_GET_LINEINFO_WATCH_IOCTL:
*****************************
GPIO_GET_LINEINFO_WATCH_IOCTL
*****************************
.. warning::
This ioctl is part of chardev_v1.rst and is obsoleted by
gpio-v2-get-lineinfo-watch-ioctl.rst.
Name
====
GPIO_GET_LINEINFO_WATCH_IOCT... | Documentation/userspace-api/gpio/gpio-get-lineinfo-watch-ioctl.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. _GPIOHANDLE_GET_LINE_VALUES_IOCTL:
********************************
GPIOHANDLE_GET_LINE_VALUES_IOCTL
********************************
.. warning::
This ioctl is part of chardev_v1.rst and is obsoleted by
gpio-v2-line-get-values-ioctl.rst.
Name
====
GPIOHANDLE_GET_LINE_... | Documentation/userspace-api/gpio/gpio-handle-get-line-values-ioctl.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. _GPIOHANDLE_SET_CONFIG_IOCTL:
***************************
GPIOHANDLE_SET_CONFIG_IOCTL
***************************
.. warning::
This ioctl is part of chardev_v1.rst and is obsoleted by
gpio-v2-line-set-config-ioctl.rst.
Name
====
GPIOHANDLE_SET_CONFIG_IOCTL - Update th... | Documentation/userspace-api/gpio/gpio-handle-set-config-ioctl.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. _GPIO_HANDLE_SET_LINE_VALUES_IOCTL:
*********************************
GPIO_HANDLE_SET_LINE_VALUES_IOCTL
*********************************
.. warning::
This ioctl is part of chardev_v1.rst and is obsoleted by
gpio-v2-line-set-values-ioctl.rst.
Name
====
GPIO_HANDLE_SET_... | Documentation/userspace-api/gpio/gpio-handle-set-line-values-ioctl.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. _GPIO_LINEEVENT_DATA_READ:
************************
GPIO_LINEEVENT_DATA_READ
************************
.. warning::
This ioctl is part of chardev_v1.rst and is obsoleted by
gpio-v2-line-event-read.rst.
Name
====
GPIO_LINEEVENT_DATA_READ - Read edge detection events fro... | Documentation/userspace-api/gpio/gpio-lineevent-data-read.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. _GPIO_LINEINFO_CHANGED_READ:
**************************
GPIO_LINEINFO_CHANGED_READ
**************************
.. warning::
This ioctl is part of chardev_v1.rst and is obsoleted by
gpio-v2-lineinfo-changed-read.rst.
Name
====
GPIO_LINEINFO_CHANGED_READ - Read line info... | Documentation/userspace-api/gpio/gpio-lineinfo-changed-read.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. _GPIO_V2_GET_LINE_IOCTL:
**********************
GPIO_V2_GET_LINE_IOCTL
**********************
Name
====
GPIO_V2_GET_LINE_IOCTL - Request a line or lines from the kernel.
Synopsis
========
.. c:macro:: GPIO_V2_GET_LINE_IOCTL
``int ioctl(int chip_fd, GPIO_V2_GET_LINE_IOCTL, s... | Documentation/userspace-api/gpio/gpio-v2-get-line-ioctl.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. _GPIO_V2_GET_LINEINFO_IOCTL:
**************************
GPIO_V2_GET_LINEINFO_IOCTL
**************************
Name
====
GPIO_V2_GET_LINEINFO_IOCTL - Get the publicly available information for a line.
Synopsis
========
.. c:macro:: GPIO_V2_GET_LINEINFO_IOCTL
``int ioctl(int ... | Documentation/userspace-api/gpio/gpio-v2-get-lineinfo-ioctl.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. _GPIO_V2_GET_LINEINFO_WATCH_IOCTL:
********************************
GPIO_V2_GET_LINEINFO_WATCH_IOCTL
********************************
Name
====
GPIO_V2_GET_LINEINFO_WATCH_IOCTL - Enable watching a line for changes to its
request state and configuration information.
Synopsis
=... | Documentation/userspace-api/gpio/gpio-v2-get-lineinfo-watch-ioctl.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. _GPIO_V2_LINE_EVENT_READ:
***********************
GPIO_V2_LINE_EVENT_READ
***********************
Name
====
GPIO_V2_LINE_EVENT_READ - Read edge detection events for lines from a request.
Synopsis
========
``int read(int req_fd, void *buf, size_t count)``
Arguments
=========... | Documentation/userspace-api/gpio/gpio-v2-line-event-read.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. _GPIO_V2_LINE_GET_VALUES_IOCTL:
*****************************
GPIO_V2_LINE_GET_VALUES_IOCTL
*****************************
Name
====
GPIO_V2_LINE_GET_VALUES_IOCTL - Get the values of requested lines.
Synopsis
========
.. c:macro:: GPIO_V2_LINE_GET_VALUES_IOCTL
``int ioctl(in... | Documentation/userspace-api/gpio/gpio-v2-line-get-values-ioctl.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. _GPIO_V2_LINE_SET_CONFIG_IOCTL:
*****************************
GPIO_V2_LINE_SET_CONFIG_IOCTL
*****************************
Name
====
GPIO_V2_LINE_SET_CONFIG_IOCTL - Update the configuration of previously requested lines.
Synopsis
========
.. c:macro:: GPIO_V2_LINE_SET_CONFIG_... | Documentation/userspace-api/gpio/gpio-v2-line-set-config-ioctl.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. _GPIO_V2_LINE_SET_VALUES_IOCTL:
*****************************
GPIO_V2_LINE_SET_VALUES_IOCTL
*****************************
Name
====
GPIO_V2_LINE_SET_VALUES_IOCTL - Set the values of requested output lines.
Synopsis
========
.. c:macro:: GPIO_V2_LINE_SET_VALUES_IOCTL
``int i... | Documentation/userspace-api/gpio/gpio-v2-line-set-values-ioctl.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. _GPIO_V2_LINEINFO_CHANGED_READ:
*****************************
GPIO_V2_LINEINFO_CHANGED_READ
*****************************
Name
====
GPIO_V2_LINEINFO_CHANGED_READ - Read line info changed events for watched
lines from the chip.
Synopsis
========
``int read(int chip_fd, void *... | Documentation/userspace-api/gpio/gpio-v2-lineinfo-changed-read.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
====
GPIO
====
.. toctree::
:maxdepth: 1
Character Device Userspace API <chardev>
Obsolete Userspace APIs <obsolete> | Documentation/userspace-api/gpio/index.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
============================
Obsolete GPIO Userspace APIs
============================
.. toctree::
:maxdepth: 1
Character Device Userspace API (v1) <chardev_v1>
Sysfs Interface <sysfs> | Documentation/userspace-api/gpio/obsolete.rst | null | null | null | null | null |
source | linux | GPIO Sysfs Interface for Userspace
==================================
.. warning::
This API is obsoleted by the chardev.rst and the ABI documentation has
been moved to Documentation/ABI/obsolete/sysfs-gpio.
New developments should use the chardev.rst, and existing developments are
encouraged to migrate as... | Documentation/userspace-api/gpio/sysfs.rst | null | null | null | null | null |
source | linux | ============================
Summary of CDROM ioctl calls
============================
- Edward A. Falk <efalk@google.com>
November, 2004
This document attempts to describe the ioctl(2) calls supported by
the CDROM layer. These are by-and-large implemented (as of Linux 2.6)
in drivers/cdrom/cdrom.c and drivers/bloc... | Documentation/userspace-api/ioctl/cdrom.rst | null | null | null | null | null |
source | linux | ==============================
Summary of `HDIO_` ioctl calls
==============================
- Edward A. Falk <efalk@google.com>
November, 2004
This document attempts to describe the ioctl(2) calls supported by
the HD/IDE layer. These are by-and-large implemented (as of Linux 5.11)
drivers/ata/libata-scsi.c.
ioctl... | Documentation/userspace-api/ioctl/hdio.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
======
IOCTLs
======
.. toctree::
:maxdepth: 1
ioctl-number
ioctl-decoding
cdrom
hdio | Documentation/userspace-api/ioctl/index.rst | null | null | null | null | null |
source | linux | ==============================
Decoding an IOCTL Magic Number
==============================
To decode a hex IOCTL code:
Most architectures use this generic format, but check
include/ARCH/ioctl.h for specifics, e.g. powerpc
uses 3 bits to encode read/write and 13 bits for size.
====== ==============================... | Documentation/userspace-api/ioctl/ioctl-decoding.rst | null | null | null | null | null |
source | linux | =============
Ioctl Numbers
=============
19 October 1999
Michael Elizabeth Chastain
<mec@shout.net>
If you are adding new ioctl's to the kernel, you should use the _IO
macros defined in <linux/ioctl.h>:
====== ===========================
macro parameters
====== ===========================
_IO n... | Documentation/userspace-api/ioctl/ioctl-number.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. _fdl:
******************************
GNU Free Documentation License
******************************
.. _fdl-preamble:
0. PREAMBLE
===========
The purpose of this License is to make a manual, textbook, or other
written document "free" in the sense of fr... | Documentation/userspace-api/media/fdl-appendix.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. _gen_errors:
*******************
Generic Error Codes
*******************
.. _gen-errors:
.. tabularcolumns:: |p{2.5cm}|p{15.0cm}|
.. flat-table:: Generic error codes
:header-rows: 0
:stub-columns: 0
:widths: 1 16
- - ``EAGAIN`` (a... | Documentation/userspace-api/media/gen-errors.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later
========
Glossary
========
.. note::
The goal of this section is to standardize the terms used within the media
userspace API documentation. This is Work In Progress.
.. Please keep the glossary entries in alphabetical order
.. glossary::... | Documentation/userspace-api/media/glossary.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
.. include:: <isonum.txt>
########################################
Linux Media Infrastructure userspace API
########################################
This section contains the driver development information and Kernel APIs
used by media devices.
Please see:
Documentation/admin-g... | Documentation/userspace-api/media/index.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
============
Introduction
============
This document covers the Linux Kernel to Userspace API's used by video
and radio streaming devices, including video cameras, analog and digital
TV receiver cards, AM/FM receiver cards, Software Defined Radio (SDR),
streaming capture and output... | Documentation/userspace-api/media/intro.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. include:: <isonum.txt>
.. _cec:
#########################################
Part V - Consumer Electronics Control API
#########################################
This part describes the CEC: Consumer Electronics Control
.. toctree::
:caption: Table of ... | Documentation/userspace-api/media/cec/cec-api.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. c:namespace:: CEC
.. _cec-func-close:
***********
cec close()
***********
Name
====
cec-close - Close a cec device
Synopsis
========
.. code-block:: c
#include <unistd.h>
.. c:function:: int close( int fd )
Arguments
=========
``fd``
File ... | Documentation/userspace-api/media/cec/cec-func-close.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. c:namespace:: CEC
.. _cec-func-ioctl:
***********
cec ioctl()
***********
Name
====
cec-ioctl - Control a cec device
Synopsis
========
.. code-block:: c
#include <sys/ioctl.h>
``int ioctl(int fd, int request, void *argp)``
Arguments
=========
... | Documentation/userspace-api/media/cec/cec-func-ioctl.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. c:namespace:: CEC
.. _cec-func-open:
**********
cec open()
**********
Name
====
cec-open - Open a cec device
Synopsis
========
.. code-block:: c
#include <fcntl.h>
.. c:function:: int open( const char *device_name, int flags )
Arguments
=======... | Documentation/userspace-api/media/cec/cec-func-open.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. c:namespace:: CEC
.. _cec-func-poll:
**********
cec poll()
**********
Name
====
cec-poll - Wait for some event on a file descriptor
Synopsis
========
.. code-block:: c
#include <sys/poll.h>
.. c:function:: int poll( struct pollfd *ufds, unsigned... | Documentation/userspace-api/media/cec/cec-func-poll.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. _cec-user-func:
******************
Function Reference
******************
.. toctree::
:maxdepth: 1
cec-func-open
cec-func-close
cec-func-ioctl
cec-func-poll
cec-ioc-adap-g-caps
cec-ioc-adap-g-log-addrs
cec-ioc-adap-g-phy... | Documentation/userspace-api/media/cec/cec-funcs.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. _cec_header:
****************
CEC uAPI Symbols
****************
.. kernel-include:: include/uapi/linux/cec.h
:generate-cross-refs:
:exception-file: cec.h.rst.exceptions
:toc:
:warn-broken: | Documentation/userspace-api/media/cec/cec-header.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. _cec-intro:
Introduction
============
HDMI connectors provide a single pin for use by the Consumer Electronics
Control protocol. This protocol allows different devices connected by an
HDMI cable to communicate. The protocol for CEC version 1.4 is defined... | Documentation/userspace-api/media/cec/cec-intro.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. c:namespace:: CEC
.. _CEC_ADAP_G_CAPS:
*********************
ioctl CEC_ADAP_G_CAPS
*********************
Name
====
CEC_ADAP_G_CAPS - Query device capabilities
Synopsis
========
.. c:macro:: CEC_ADAP_G_CAPS
``int ioctl(int fd, CEC_ADAP_G_CAPS, struct ... | Documentation/userspace-api/media/cec/cec-ioc-adap-g-caps.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GPL-2.0
..
.. Copyright 2019 Google LLC
..
.. c:namespace:: CEC
.. _CEC_ADAP_G_CONNECTOR_INFO:
*******************************
ioctl CEC_ADAP_G_CONNECTOR_INFO
*******************************
Name
====
CEC_ADAP_G_CONNECTOR_INFO - Query HDMI connector information
Synopsis
========
.. c:m... | Documentation/userspace-api/media/cec/cec-ioc-adap-g-conn-info.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. c:namespace:: CEC
.. _CEC_ADAP_LOG_ADDRS:
.. _CEC_ADAP_G_LOG_ADDRS:
.. _CEC_ADAP_S_LOG_ADDRS:
****************************************************
ioctls CEC_ADAP_G_LOG_ADDRS and CEC_ADAP_S_LOG_ADDRS
****************************************************
N... | Documentation/userspace-api/media/cec/cec-ioc-adap-g-log-addrs.rst | null | null | null | null | null |
source | linux | .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. c:namespace:: CEC
.. _CEC_ADAP_PHYS_ADDR:
.. _CEC_ADAP_G_PHYS_ADDR:
.. _CEC_ADAP_S_PHYS_ADDR:
****************************************************
ioctls CEC_ADAP_G_PHYS_ADDR and CEC_ADAP_S_PHYS_ADDR
****************************************************
N... | Documentation/userspace-api/media/cec/cec-ioc-adap-g-phys-addr.rst | null | null | null | null | null |
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