052876f8e5
This adds two new ioctls, UINPUT_DEV_SETUP and UI_ABS_SETUP, that replaces the old device setup method (by write()'ing "struct uinput_user_dev" to the node). The old method is not easily extendable and requires huge payloads. Furthermore, overloading write() without properly versioned objects is error-prone. Therefore, we introduce two new ioctls to replace the old method. These ioctls support all features of the old method, plus a "resolution" field for absinfo. Furthermore, it's properly forward-compatible to new ABS codes and a growing "struct input_absinfo" structure. UI_ABS_SETUP also allows user-space to skip unknown axes if not set. There is no need to copy the whole array temporarily into the kernel, but instead the caller issues several ioctl where we copy each value manually. Signed-off-by: David Herrmann <dh.herrmann@gmail.com> 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>
82 lines
2.4 KiB
C
82 lines
2.4 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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* 0.5 08/13/2015 (David Herrmann <dh.herrmann@gmail.com> &
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* Benjamin Tissoires <benjamin.tissoires@redhat.com>)
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* - add UI_DEV_SETUP ioctl
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* - add UI_ABS_SETUP ioctl
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* - add UI_GET_VERSION ioctl
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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 __UINPUT_H_
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#define __UINPUT_H_
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#include <uapi/linux/uinput.h>
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#define UINPUT_NAME "uinput"
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#define UINPUT_BUFFER_SIZE 16
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#define UINPUT_NUM_REQUESTS 16
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enum uinput_state { UIST_NEW_DEVICE, UIST_SETUP_COMPLETE, UIST_CREATED };
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struct uinput_request {
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unsigned int id;
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unsigned int code; /* UI_FF_UPLOAD, UI_FF_ERASE */
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int retval;
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struct completion done;
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union {
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unsigned int effect_id;
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struct {
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struct ff_effect *effect;
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struct ff_effect *old;
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} upload;
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} u;
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};
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struct uinput_device {
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struct input_dev *dev;
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struct mutex mutex;
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enum uinput_state state;
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wait_queue_head_t waitq;
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unsigned char ready;
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unsigned char head;
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unsigned char tail;
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struct input_event buff[UINPUT_BUFFER_SIZE];
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unsigned int ff_effects_max;
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struct uinput_request *requests[UINPUT_NUM_REQUESTS];
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wait_queue_head_t requests_waitq;
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spinlock_t requests_lock;
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};
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#endif /* __UINPUT_H_ */
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