linux-imx

/*

 *  User level driver support for input subsystem

 *

 * Heavily based on evdev.c by Vojtech Pavlik

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 *

 * Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>

 *

 * Changes/Revisions:

 *  0.4 01/09/2014 (Benjamin Tissoires <benjamin.tissoires@redhat.com>)

 *      - add UI_GET_SYSNAME ioctl

 *  0.3 09/04/2006 (Anssi Hannula <anssi.hannula@gmail.com>)

 *      - updated ff support for the changes in kernel interface

 *      - added MODULE_VERSION

 *  0.2 16/10/2004 (Micah Dowty <micah@navi.cx>)

 *      - added force feedback support

 *              - added UI_SET_PHYS

 *  0.1 20/06/2002

 *      - first public version

 */

#include <uapi/linux/uinput.h>

#include <linux/poll.h>

#include <linux/sched.h>

#include <linux/slab.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/fs.h>

#include <linux/miscdevice.h>

#include <linux/overflow.h>

#include <linux/input/mt.h>

#include "../input-compat.h"

​

#define UINPUT_NAME     "uinput"

#define UINPUT_BUFFER_SIZE  16

#define UINPUT_NUM_REQUESTS 16

​

enum uinput_state { UIST_NEW_DEVICE, UIST_SETUP_COMPLETE, UIST_CREATED };

​

struct uinput_request {

    unsigned int        id;

    unsigned int        code;   /* UI_FF_UPLOAD, UI_FF_ERASE */

​

    int         retval;

    struct completion   done;

​

    union {

        unsigned int    effect_id;

        struct {

            struct ff_effect *effect;

            struct ff_effect *old;

        } upload;

    } u;

};

​

struct uinput_device {

    struct input_dev    *dev;

    struct mutex        mutex;

    enum uinput_state   state;

    wait_queue_head_t   waitq;

    unsigned char       ready;

    unsigned char       head;

    unsigned char       tail;

    struct input_event  buff[UINPUT_BUFFER_SIZE];

    unsigned int        ff_effects_max;

​

    struct uinput_request   *requests[UINPUT_NUM_REQUESTS];

    wait_queue_head_t   requests_waitq;

    spinlock_t      requests_lock;

};

​

static int uinput_dev_event(struct input_dev *dev,

                unsigned int type, unsigned int code, int value)

{

    struct uinput_device    *udev = input_get_drvdata(dev);

    struct timespec64   ts;

​

    udev->buff[udev->head].type = type;

    udev->buff[udev->head].code = code;

    udev->buff[udev->head].value = value;