linux-imx

/*

 * Input driver to ExplorerPS/2 device driver module.

 *

 * Copyright (c) 1999-2002 Vojtech Pavlik

 * Copyright (c) 2004      Dmitry Torokhov

 *

 * 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.

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#define MOUSEDEV_MINOR_BASE 32

#define MOUSEDEV_MINORS     31

#define MOUSEDEV_MIX        63

​

#include <linux/bitops.h>

#include <linux/sched.h>

#include <linux/slab.h>

#include <linux/poll.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/input.h>

#include <linux/random.h>

#include <linux/major.h>

#include <linux/device.h>

#include <linux/cdev.h>

#include <linux/kernel.h>

​

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");

MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces");

MODULE_LICENSE("GPL");

​

#ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X

#define CONFIG_INPUT_MOUSEDEV_SCREEN_X  1024

#endif

#ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y

#define CONFIG_INPUT_MOUSEDEV_SCREEN_Y  768

#endif

​

static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X;

module_param(xres, uint, 0644);

MODULE_PARM_DESC(xres, "Horizontal screen resolution");

​

static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y;

module_param(yres, uint, 0644);

MODULE_PARM_DESC(yres, "Vertical screen resolution");

​

static unsigned tap_time = 200;

module_param(tap_time, uint, 0644);

MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)");

​

struct mousedev_hw_data {

    int dx, dy, dz;

    int x, y;

    int abs_event;

    unsigned long buttons;

};

​

struct mousedev {

    int open;

    struct input_handle handle;

    wait_queue_head_t wait;

    struct list_head client_list;

    spinlock_t client_lock; /* protects client_list */

    struct mutex mutex;

    struct device dev;

    struct cdev cdev;

    bool exist;

​

    struct list_head mixdev_node;

    bool opened_by_mixdev;

​

    struct mousedev_hw_data packet;

    unsigned int pkt_count;

    int old_x[4], old_y[4];

    int frac_dx, frac_dy;

    unsigned long touch;

​

    int (*open_device)(struct mousedev *mousedev);

    void (*close_device)(struct mousedev *mousedev);

};

​

enum mousedev_emul {

    MOUSEDEV_EMUL_PS2,

    MOUSEDEV_EMUL_IMPS,

    MOUSEDEV_EMUL_EXPS

};

​

struct mousedev_motion {

    int dx, dy, dz;