e3480a61fc
uinput is used in the xorg-integration-tests suite and in the wayland test suite. These automated tests suites create many virtual input devices and then hook something to read these newly created devices. Currently, uinput does not provide the created input device, which means that we rely on an heuristic to guess which input node was created. The problem is that is heuristic is subjected to races between different uinput devices or even with physical devices. Having a way to retrieve the sysfs path allows us to find without any doubts the event node. Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Reviewed-by: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
149 lines
5.4 KiB
C
149 lines
5.4 KiB
C
/*
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* User level driver support for input subsystem
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*
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* Heavily based on evdev.c by Vojtech Pavlik
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
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*
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* Changes/Revisions:
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* 0.4 01/09/2014 (Benjamin Tissoires <benjamin.tissoires@redhat.com>)
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* - add UI_GET_SYSNAME ioctl
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* 0.3 24/05/2006 (Anssi Hannula <anssi.hannulagmail.com>)
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* - update ff support for the changes in kernel interface
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* - add UINPUT_VERSION
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* 0.2 16/10/2004 (Micah Dowty <micah@navi.cx>)
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* - added force feedback support
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* - added UI_SET_PHYS
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* 0.1 20/06/2002
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* - first public version
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*/
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#ifndef _UAPI__UINPUT_H_
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#define _UAPI__UINPUT_H_
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#include <linux/types.h>
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#include <linux/input.h>
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#define UINPUT_VERSION 4
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struct uinput_ff_upload {
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__u32 request_id;
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__s32 retval;
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struct ff_effect effect;
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struct ff_effect old;
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};
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struct uinput_ff_erase {
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__u32 request_id;
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__s32 retval;
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__u32 effect_id;
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};
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/* ioctl */
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#define UINPUT_IOCTL_BASE 'U'
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#define UI_DEV_CREATE _IO(UINPUT_IOCTL_BASE, 1)
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#define UI_DEV_DESTROY _IO(UINPUT_IOCTL_BASE, 2)
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#define UI_SET_EVBIT _IOW(UINPUT_IOCTL_BASE, 100, int)
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#define UI_SET_KEYBIT _IOW(UINPUT_IOCTL_BASE, 101, int)
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#define UI_SET_RELBIT _IOW(UINPUT_IOCTL_BASE, 102, int)
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#define UI_SET_ABSBIT _IOW(UINPUT_IOCTL_BASE, 103, int)
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#define UI_SET_MSCBIT _IOW(UINPUT_IOCTL_BASE, 104, int)
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#define UI_SET_LEDBIT _IOW(UINPUT_IOCTL_BASE, 105, int)
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#define UI_SET_SNDBIT _IOW(UINPUT_IOCTL_BASE, 106, int)
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#define UI_SET_FFBIT _IOW(UINPUT_IOCTL_BASE, 107, int)
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#define UI_SET_PHYS _IOW(UINPUT_IOCTL_BASE, 108, char*)
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#define UI_SET_SWBIT _IOW(UINPUT_IOCTL_BASE, 109, int)
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#define UI_SET_PROPBIT _IOW(UINPUT_IOCTL_BASE, 110, int)
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#define UI_BEGIN_FF_UPLOAD _IOWR(UINPUT_IOCTL_BASE, 200, struct uinput_ff_upload)
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#define UI_END_FF_UPLOAD _IOW(UINPUT_IOCTL_BASE, 201, struct uinput_ff_upload)
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#define UI_BEGIN_FF_ERASE _IOWR(UINPUT_IOCTL_BASE, 202, struct uinput_ff_erase)
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#define UI_END_FF_ERASE _IOW(UINPUT_IOCTL_BASE, 203, struct uinput_ff_erase)
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/**
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* UI_GET_SYSNAME - get the sysfs name of the created uinput device
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*
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* @return the sysfs name of the created virtual input device.
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* The complete sysfs path is then /sys/devices/virtual/input/--NAME--
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* Usually, it is in the form "inputN"
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*/
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#define UI_GET_SYSNAME(len) _IOC(_IOC_READ, UINPUT_IOCTL_BASE, 300, len)
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/*
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* To write a force-feedback-capable driver, the upload_effect
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* and erase_effect callbacks in input_dev must be implemented.
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* The uinput driver will generate a fake input event when one of
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* these callbacks are invoked. The userspace code then uses
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* ioctls to retrieve additional parameters and send the return code.
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* The callback blocks until this return code is sent.
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*
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* The described callback mechanism is only used if ff_effects_max
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* is set.
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*
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* To implement upload_effect():
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* 1. Wait for an event with type == EV_UINPUT and code == UI_FF_UPLOAD.
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* A request ID will be given in 'value'.
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* 2. Allocate a uinput_ff_upload struct, fill in request_id with
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* the 'value' from the EV_UINPUT event.
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* 3. Issue a UI_BEGIN_FF_UPLOAD ioctl, giving it the
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* uinput_ff_upload struct. It will be filled in with the
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* ff_effects passed to upload_effect().
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* 4. Perform the effect upload, and place a return code back into
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the uinput_ff_upload struct.
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* 5. Issue a UI_END_FF_UPLOAD ioctl, also giving it the
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* uinput_ff_upload_effect struct. This will complete execution
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* of our upload_effect() handler.
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*
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* To implement erase_effect():
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* 1. Wait for an event with type == EV_UINPUT and code == UI_FF_ERASE.
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* A request ID will be given in 'value'.
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* 2. Allocate a uinput_ff_erase struct, fill in request_id with
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* the 'value' from the EV_UINPUT event.
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* 3. Issue a UI_BEGIN_FF_ERASE ioctl, giving it the
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* uinput_ff_erase struct. It will be filled in with the
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* effect ID passed to erase_effect().
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* 4. Perform the effect erasure, and place a return code back
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* into the uinput_ff_erase struct.
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* 5. Issue a UI_END_FF_ERASE ioctl, also giving it the
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* uinput_ff_erase_effect struct. This will complete execution
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* of our erase_effect() handler.
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*/
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/*
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* This is the new event type, used only by uinput.
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* 'code' is UI_FF_UPLOAD or UI_FF_ERASE, and 'value'
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* is the unique request ID. This number was picked
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* arbitrarily, above EV_MAX (since the input system
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* never sees it) but in the range of a 16-bit int.
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*/
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#define EV_UINPUT 0x0101
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#define UI_FF_UPLOAD 1
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#define UI_FF_ERASE 2
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#define UINPUT_MAX_NAME_SIZE 80
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struct uinput_user_dev {
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char name[UINPUT_MAX_NAME_SIZE];
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struct input_id id;
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__u32 ff_effects_max;
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__s32 absmax[ABS_CNT];
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__s32 absmin[ABS_CNT];
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__s32 absfuzz[ABS_CNT];
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__s32 absflat[ABS_CNT];
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};
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#endif /* _UAPI__UINPUT_H_ */
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