update SDL soruce to 2.0.14

Edward Rudd

2021-06-15 dec7875a6e23212021e4d9080330a42832dfe02a

 source/src/core/linux/SDL_evdev.c

@@ -1,6 +1,6 @@
/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
@@ -29,306 +29,94 @@
 *             The evtest application is also useful to debug the protocol
 */


#include "SDL_evdev.h"
#define _THIS SDL_EVDEV_PrivateData *_this
static _THIS = NULL;
#include "SDL_evdev_kbd.h"

#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <limits.h>             /* For the definition of PATH_MAX */
#include <linux/input.h>
#ifdef SDL_INPUT_LINUXKD
#include <linux/kd.h>
#include <linux/keyboard.h>
#endif


/* We need this to prevent keystrokes from appear in the console */
#ifndef KDSKBMUTE
#define KDSKBMUTE 0x4B51
#endif
#ifndef KDSKBMODE
#define KDSKBMODE 0x4B45
#endif
#ifndef K_OFF
#define K_OFF 0x04
#endif

#include "SDL.h"
#include "SDL_assert.h"
#include "SDL_endian.h"
#include "../../core/linux/SDL_udev.h"
#include "SDL_scancode.h"
#include "../../events/SDL_events_c.h"
#include "../../events/scancodes_linux.h" /* adds linux_scancode_table */
#include "../../core/linux/SDL_evdev_capabilities.h"
#include "../../core/linux/SDL_udev.h"

/* This isn't defined in older Linux kernel headers */
/* These are not defined in older Linux kernel headers */
#ifndef SYN_DROPPED
#define SYN_DROPPED 3
#endif
#ifndef ABS_MT_SLOT
#define ABS_MT_SLOT         0x2f
#define ABS_MT_POSITION_X   0x35
#define ABS_MT_POSITION_Y   0x36
#define ABS_MT_TRACKING_ID  0x39
#define ABS_MT_PRESSURE     0x3a
#endif

typedef struct SDL_evdevlist_item
{
    char *path;
    int fd;

    /* TODO: use this for every device, not just touchscreen */
    int out_of_sync;

    /* TODO: expand on this to have data for every possible class (mouse,
       keyboard, touchpad, etc.). Also there's probably some things in here we
       can pull out to the SDL_evdevlist_item i.e. name */
    int is_touchscreen;
    struct {
        char* name;

        int min_x, max_x, range_x;
        int min_y, max_y, range_y;
        int min_pressure, max_pressure, range_pressure;

        int max_slots;
        int current_slot;
        struct {
            enum {
                EVDEV_TOUCH_SLOTDELTA_NONE = 0,
                EVDEV_TOUCH_SLOTDELTA_DOWN,
                EVDEV_TOUCH_SLOTDELTA_UP,
                EVDEV_TOUCH_SLOTDELTA_MOVE
            } delta;
            int tracking_id;
            int x, y, pressure;
        } * slots;

    } * touchscreen_data;

    struct SDL_evdevlist_item *next;
} SDL_evdevlist_item;

typedef struct SDL_EVDEV_PrivateData
{
    int ref_count;
    int num_devices;
    SDL_evdevlist_item *first;
    SDL_evdevlist_item *last;
    SDL_EVDEV_keyboard_state *kbd;
} SDL_EVDEV_PrivateData;

#undef _THIS
#define _THIS SDL_EVDEV_PrivateData *_this
static _THIS = NULL;

static SDL_Scancode SDL_EVDEV_translate_keycode(int keycode);
static void SDL_EVDEV_sync_device(SDL_evdevlist_item *item);
static int SDL_EVDEV_device_removed(const char *devpath);
static int SDL_EVDEV_device_removed(const char *dev_path);

#if SDL_USE_LIBUDEV
static int SDL_EVDEV_device_added(const char *devpath);
void SDL_EVDEV_udev_callback(SDL_UDEV_deviceevent udev_type, int udev_class, const char *devpath);
static int SDL_EVDEV_device_added(const char *dev_path, int udev_class);
static void SDL_EVDEV_udev_callback(SDL_UDEV_deviceevent udev_type, int udev_class,
    const char *dev_path);
#endif /* SDL_USE_LIBUDEV */

static SDL_Scancode EVDEV_Keycodes[] = {
    SDL_SCANCODE_UNKNOWN,       /*  KEY_RESERVED        0 */
    SDL_SCANCODE_ESCAPE,        /*  KEY_ESC         1 */
    SDL_SCANCODE_1,             /*  KEY_1           2 */
    SDL_SCANCODE_2,             /*  KEY_2           3 */
    SDL_SCANCODE_3,             /*  KEY_3           4 */
    SDL_SCANCODE_4,             /*  KEY_4           5 */
    SDL_SCANCODE_5,             /*  KEY_5           6 */
    SDL_SCANCODE_6,             /*  KEY_6           7 */
    SDL_SCANCODE_7,             /*  KEY_7           8 */
    SDL_SCANCODE_8,             /*  KEY_8           9 */
    SDL_SCANCODE_9,             /*  KEY_9           10 */
    SDL_SCANCODE_0,             /*  KEY_0           11 */
    SDL_SCANCODE_MINUS,         /*  KEY_MINUS       12 */
    SDL_SCANCODE_EQUALS,        /*  KEY_EQUAL       13 */
    SDL_SCANCODE_BACKSPACE,     /*  KEY_BACKSPACE       14 */
    SDL_SCANCODE_TAB,           /*  KEY_TAB         15 */
    SDL_SCANCODE_Q,             /*  KEY_Q           16 */
    SDL_SCANCODE_W,             /*  KEY_W           17 */
    SDL_SCANCODE_E,             /*  KEY_E           18 */
    SDL_SCANCODE_R,             /*  KEY_R           19 */
    SDL_SCANCODE_T,             /*  KEY_T           20 */
    SDL_SCANCODE_Y,             /*  KEY_Y           21 */
    SDL_SCANCODE_U,             /*  KEY_U           22 */
    SDL_SCANCODE_I,             /*  KEY_I           23 */
    SDL_SCANCODE_O,             /*  KEY_O           24 */
    SDL_SCANCODE_P,             /*  KEY_P           25 */
    SDL_SCANCODE_LEFTBRACKET,   /*  KEY_LEFTBRACE       26 */
    SDL_SCANCODE_RIGHTBRACKET,  /*  KEY_RIGHTBRACE      27 */
    SDL_SCANCODE_RETURN,        /*  KEY_ENTER       28 */
    SDL_SCANCODE_LCTRL,         /*  KEY_LEFTCTRL        29 */
    SDL_SCANCODE_A,             /*  KEY_A           30 */
    SDL_SCANCODE_S,             /*  KEY_S           31 */
    SDL_SCANCODE_D,             /*  KEY_D           32 */
    SDL_SCANCODE_F,             /*  KEY_F           33 */
    SDL_SCANCODE_G,             /*  KEY_G           34 */
    SDL_SCANCODE_H,             /*  KEY_H           35 */
    SDL_SCANCODE_J,             /*  KEY_J           36 */
    SDL_SCANCODE_K,             /*  KEY_K           37 */
    SDL_SCANCODE_L,             /*  KEY_L           38 */
    SDL_SCANCODE_SEMICOLON,     /*  KEY_SEMICOLON       39 */
    SDL_SCANCODE_APOSTROPHE,    /*  KEY_APOSTROPHE      40 */
    SDL_SCANCODE_GRAVE,         /*  KEY_GRAVE       41 */
    SDL_SCANCODE_LSHIFT,        /*  KEY_LEFTSHIFT       42 */
    SDL_SCANCODE_BACKSLASH,     /*  KEY_BACKSLASH       43 */
    SDL_SCANCODE_Z,             /*  KEY_Z           44 */
    SDL_SCANCODE_X,             /*  KEY_X           45 */
    SDL_SCANCODE_C,             /*  KEY_C           46 */
    SDL_SCANCODE_V,             /*  KEY_V           47 */
    SDL_SCANCODE_B,             /*  KEY_B           48 */
    SDL_SCANCODE_N,             /*  KEY_N           49 */
    SDL_SCANCODE_M,             /*  KEY_M           50 */
    SDL_SCANCODE_COMMA,         /*  KEY_COMMA       51 */
    SDL_SCANCODE_PERIOD,        /*  KEY_DOT         52 */
    SDL_SCANCODE_SLASH,         /*  KEY_SLASH       53 */
    SDL_SCANCODE_RSHIFT,        /*  KEY_RIGHTSHIFT      54 */
    SDL_SCANCODE_KP_MULTIPLY,   /*  KEY_KPASTERISK      55 */
    SDL_SCANCODE_LALT,          /*  KEY_LEFTALT     56 */
    SDL_SCANCODE_SPACE,         /*  KEY_SPACE       57 */
    SDL_SCANCODE_CAPSLOCK,      /*  KEY_CAPSLOCK        58 */
    SDL_SCANCODE_F1,            /*  KEY_F1          59 */
    SDL_SCANCODE_F2,            /*  KEY_F2          60 */
    SDL_SCANCODE_F3,            /*  KEY_F3          61 */
    SDL_SCANCODE_F4,            /*  KEY_F4          62 */
    SDL_SCANCODE_F5,            /*  KEY_F5          63 */
    SDL_SCANCODE_F6,            /*  KEY_F6          64 */
    SDL_SCANCODE_F7,            /*  KEY_F7          65 */
    SDL_SCANCODE_F8,            /*  KEY_F8          66 */
    SDL_SCANCODE_F9,            /*  KEY_F9          67 */
    SDL_SCANCODE_F10,           /*  KEY_F10         68 */
    SDL_SCANCODE_NUMLOCKCLEAR,  /*  KEY_NUMLOCK     69 */
    SDL_SCANCODE_SCROLLLOCK,    /*  KEY_SCROLLLOCK      70 */
    SDL_SCANCODE_KP_7,          /*  KEY_KP7         71 */
    SDL_SCANCODE_KP_8,          /*  KEY_KP8         72 */
    SDL_SCANCODE_KP_9,          /*  KEY_KP9         73 */
    SDL_SCANCODE_KP_MINUS,      /*  KEY_KPMINUS     74 */
    SDL_SCANCODE_KP_4,          /*  KEY_KP4         75 */
    SDL_SCANCODE_KP_5,          /*  KEY_KP5         76 */
    SDL_SCANCODE_KP_6,          /*  KEY_KP6         77 */
    SDL_SCANCODE_KP_PLUS,       /*  KEY_KPPLUS      78 */
    SDL_SCANCODE_KP_1,          /*  KEY_KP1         79 */
    SDL_SCANCODE_KP_2,          /*  KEY_KP2         80 */
    SDL_SCANCODE_KP_3,          /*  KEY_KP3         81 */
    SDL_SCANCODE_KP_0,          /*  KEY_KP0         82 */
    SDL_SCANCODE_KP_PERIOD,     /*  KEY_KPDOT       83 */
    SDL_SCANCODE_UNKNOWN,       /*  84 */
    SDL_SCANCODE_LANG5,         /*  KEY_ZENKAKUHANKAKU  85 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_102ND       86 */
    SDL_SCANCODE_F11,           /*  KEY_F11         87 */
    SDL_SCANCODE_F12,           /*  KEY_F12         88 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_RO          89 */
    SDL_SCANCODE_LANG3,         /*  KEY_KATAKANA        90 */
    SDL_SCANCODE_LANG4,         /*  KEY_HIRAGANA        91 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_HENKAN      92 */
    SDL_SCANCODE_LANG3,         /*  KEY_KATAKANAHIRAGANA    93 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_MUHENKAN        94 */
    SDL_SCANCODE_KP_COMMA,      /*  KEY_KPJPCOMMA       95 */
    SDL_SCANCODE_KP_ENTER,      /*  KEY_KPENTER     96 */
    SDL_SCANCODE_RCTRL,         /*  KEY_RIGHTCTRL       97 */
    SDL_SCANCODE_KP_DIVIDE,     /*  KEY_KPSLASH     98 */
    SDL_SCANCODE_SYSREQ,        /*  KEY_SYSRQ       99 */
    SDL_SCANCODE_RALT,          /*  KEY_RIGHTALT        100 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_LINEFEED        101 */
    SDL_SCANCODE_HOME,          /*  KEY_HOME        102 */
    SDL_SCANCODE_UP,            /*  KEY_UP          103 */
    SDL_SCANCODE_PAGEUP,        /*  KEY_PAGEUP      104 */
    SDL_SCANCODE_LEFT,          /*  KEY_LEFT        105 */
    SDL_SCANCODE_RIGHT,         /*  KEY_RIGHT       106 */
    SDL_SCANCODE_END,           /*  KEY_END         107 */
    SDL_SCANCODE_DOWN,          /*  KEY_DOWN        108 */
    SDL_SCANCODE_PAGEDOWN,      /*  KEY_PAGEDOWN        109 */
    SDL_SCANCODE_INSERT,        /*  KEY_INSERT      110 */
    SDL_SCANCODE_DELETE,        /*  KEY_DELETE      111 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_MACRO       112 */
    SDL_SCANCODE_MUTE,          /*  KEY_MUTE        113 */
    SDL_SCANCODE_VOLUMEDOWN,    /*  KEY_VOLUMEDOWN      114 */
    SDL_SCANCODE_VOLUMEUP,      /*  KEY_VOLUMEUP        115 */
    SDL_SCANCODE_POWER,         /*  KEY_POWER       116 SC System Power Down */
    SDL_SCANCODE_KP_EQUALS,     /*  KEY_KPEQUAL     117 */
    SDL_SCANCODE_KP_MINUS,      /*  KEY_KPPLUSMINUS     118 */
    SDL_SCANCODE_PAUSE,         /*  KEY_PAUSE       119 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_SCALE       120 AL Compiz Scale (Expose) */
    SDL_SCANCODE_KP_COMMA,      /*  KEY_KPCOMMA     121 */
    SDL_SCANCODE_LANG1,         /*  KEY_HANGEUL,KEY_HANGUEL 122 */
    SDL_SCANCODE_LANG2,         /*  KEY_HANJA       123 */
    SDL_SCANCODE_INTERNATIONAL3,/*  KEY_YEN         124 */
    SDL_SCANCODE_LGUI,          /*  KEY_LEFTMETA        125 */
    SDL_SCANCODE_RGUI,          /*  KEY_RIGHTMETA       126 */
    SDL_SCANCODE_APPLICATION,   /*  KEY_COMPOSE     127 */
    SDL_SCANCODE_STOP,          /*  KEY_STOP        128 AC Stop */
    SDL_SCANCODE_AGAIN,         /*  KEY_AGAIN       129 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_PROPS       130 AC Properties */
    SDL_SCANCODE_UNDO,          /*  KEY_UNDO        131 AC Undo */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_FRONT       132 */
    SDL_SCANCODE_COPY,          /*  KEY_COPY        133 AC Copy */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_OPEN        134 AC Open */
    SDL_SCANCODE_PASTE,         /*  KEY_PASTE       135 AC Paste */
    SDL_SCANCODE_FIND,          /*  KEY_FIND        136 AC Search */
    SDL_SCANCODE_CUT,           /*  KEY_CUT         137 AC Cut */
    SDL_SCANCODE_HELP,          /*  KEY_HELP        138 AL Integrated Help Center */
    SDL_SCANCODE_MENU,          /*  KEY_MENU        139 Menu (show menu) */
    SDL_SCANCODE_CALCULATOR,    /*  KEY_CALC        140 AL Calculator */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_SETUP       141 */
    SDL_SCANCODE_SLEEP,         /*  KEY_SLEEP       142 SC System Sleep */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_WAKEUP      143 System Wake Up */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_FILE        144 AL Local Machine Browser */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_SENDFILE        145 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_DELETEFILE      146 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_XFER        147 */
    SDL_SCANCODE_APP1,          /*  KEY_PROG1       148 */
    SDL_SCANCODE_APP1,          /*  KEY_PROG2       149 */
    SDL_SCANCODE_WWW,           /*  KEY_WWW         150 AL Internet Browser */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_MSDOS       151 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_COFFEE,KEY_SCREENLOCK      152 AL Terminal Lock/Screensaver */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_DIRECTION       153 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_CYCLEWINDOWS    154 */
    SDL_SCANCODE_MAIL,          /*  KEY_MAIL        155 */
    SDL_SCANCODE_AC_BOOKMARKS,  /*  KEY_BOOKMARKS       156 AC Bookmarks */
    SDL_SCANCODE_COMPUTER,      /*  KEY_COMPUTER        157 */
    SDL_SCANCODE_AC_BACK,       /*  KEY_BACK        158 AC Back */
    SDL_SCANCODE_AC_FORWARD,    /*  KEY_FORWARD     159 AC Forward */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_CLOSECD     160 */
    SDL_SCANCODE_EJECT,         /*  KEY_EJECTCD     161 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_EJECTCLOSECD    162 */
    SDL_SCANCODE_AUDIONEXT,     /*  KEY_NEXTSONG        163 */
    SDL_SCANCODE_AUDIOPLAY,     /*  KEY_PLAYPAUSE       164 */
    SDL_SCANCODE_AUDIOPREV,     /*  KEY_PREVIOUSSONG    165 */
    SDL_SCANCODE_AUDIOSTOP,     /*  KEY_STOPCD      166 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_RECORD      167 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_REWIND      168 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_PHONE       169 Media Select Telephone */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_ISO         170 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_CONFIG      171 AL Consumer Control Configuration */
    SDL_SCANCODE_AC_HOME,       /*  KEY_HOMEPAGE        172 AC Home */
    SDL_SCANCODE_AC_REFRESH,    /*  KEY_REFRESH     173 AC Refresh */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_EXIT        174 AC Exit */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_MOVE        175 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_EDIT        176 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_SCROLLUP        177 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_SCROLLDOWN      178 */
    SDL_SCANCODE_KP_LEFTPAREN,  /*  KEY_KPLEFTPAREN     179 */
    SDL_SCANCODE_KP_RIGHTPAREN, /*  KEY_KPRIGHTPAREN    180 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_NEW         181 AC New */
    SDL_SCANCODE_AGAIN,         /*  KEY_REDO        182 AC Redo/Repeat */
    SDL_SCANCODE_F13,           /*  KEY_F13         183 */
    SDL_SCANCODE_F14,           /*  KEY_F14         184 */
    SDL_SCANCODE_F15,           /*  KEY_F15         185 */
    SDL_SCANCODE_F16,           /*  KEY_F16         186 */
    SDL_SCANCODE_F17,           /*  KEY_F17         187 */
    SDL_SCANCODE_F18,           /*  KEY_F18         188 */
    SDL_SCANCODE_F19,           /*  KEY_F19         189 */
    SDL_SCANCODE_F20,           /*  KEY_F20         190 */
    SDL_SCANCODE_F21,           /*  KEY_F21         191 */
    SDL_SCANCODE_F22,           /*  KEY_F22         192 */
    SDL_SCANCODE_F23,           /*  KEY_F23         193 */
    SDL_SCANCODE_F24,           /*  KEY_F24         194 */
    SDL_SCANCODE_UNKNOWN,       /*  195 */
    SDL_SCANCODE_UNKNOWN,       /*  196 */
    SDL_SCANCODE_UNKNOWN,       /*  197 */
    SDL_SCANCODE_UNKNOWN,       /*  198 */
    SDL_SCANCODE_UNKNOWN,       /*  199 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_PLAYCD      200 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_PAUSECD     201 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_PROG3       202 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_PROG4       203 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_DASHBOARD       204 AL Dashboard */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_SUSPEND     205 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_CLOSE       206 AC Close */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_PLAY        207 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_FASTFORWARD     208 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_BASSBOOST       209 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_PRINT       210 AC Print */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_HP          211 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_CAMERA      212 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_SOUND       213 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_QUESTION        214 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_EMAIL       215 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_CHAT        216 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_SEARCH      217 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_CONNECT     218 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_FINANCE     219 AL Checkbook/Finance */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_SPORT       220 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_SHOP        221 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_ALTERASE        222 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_CANCEL      223 AC Cancel */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_BRIGHTNESSDOWN  224 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_BRIGHTNESSUP    225 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_MEDIA       226 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_SWITCHVIDEOMODE 227 Cycle between available video outputs (Monitor/LCD/TV-out/etc) */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_KBDILLUMTOGGLE  228 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_KBDILLUMDOWN    229 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_KBDILLUMUP      230 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_SEND        231 AC Send */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_REPLY       232 AC Reply */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_FORWARDMAIL     233 AC Forward Msg */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_SAVE        234 AC Save */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_DOCUMENTS       235 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_BATTERY     236  */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_BLUETOOTH       237 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_WLAN        238 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_UWB         239 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_UNKNOWN     240 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_VIDEO_NEXT      241 drive next video source */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_VIDEO_PREV      242 drive previous video source */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_BRIGHTNESS_CYCLE    243 brightness up, after max is min */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_BRIGHTNESS_ZERO 244 brightness off, use ambient */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_DISPLAY_OFF     245 display device to off state */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_WIMAX       246 */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_RFKILL      247 Key that controls all radios */
    SDL_SCANCODE_UNKNOWN,       /*  KEY_MICMUTE     248 Mute / unmute the microphone */
};

static Uint8 EVDEV_MouseButtons[] = {
    SDL_BUTTON_LEFT,            /*  BTN_LEFT        0x110 */
@@ -341,122 +129,20 @@
    SDL_BUTTON_X2 + 3           /*  BTN_TASK        0x117 */
};

static const char* EVDEV_consoles[] = {
    "/proc/self/fd/0",
    "/dev/tty",
    "/dev/tty0",
    "/dev/tty1",
    "/dev/tty2",
    "/dev/tty3",
    "/dev/tty4",
    "/dev/tty5",
    "/dev/tty6",
    "/dev/vc/0",
    "/dev/console"
};

#define IS_CONSOLE(fd) isatty (fd) && ioctl(fd, KDGKBTYPE, &arg) == 0 && ((arg == KB_101) || (arg == KB_84))

static int SDL_EVDEV_get_console_fd(void)
static int
SDL_EVDEV_SetRelativeMouseMode(SDL_bool enabled)
{
    int fd, i;
    char arg = 0;
    
    /* Try a few consoles to see which one we have read access to */
    
    for(i = 0; i < SDL_arraysize(EVDEV_consoles); i++) {
        fd = open(EVDEV_consoles[i], O_RDONLY);
        if (fd >= 0) {
            if (IS_CONSOLE(fd)) return fd;
            close(fd);
        }
    }
    
    /* Try stdin, stdout, stderr */
    
    for(fd = 0; fd < 3; fd++) {
        if (IS_CONSOLE(fd)) return fd;
    }
    
    /* We won't be able to send SDL_TEXTINPUT events */
    return -1;
    /* Mice already send relative events through this interface */
    return 0;
}

/* Prevent keystrokes from reaching the tty */
static int SDL_EVDEV_mute_keyboard(int tty, int *kb_mode)
{
    char arg;
    
    *kb_mode = 0; /* FIXME: Is this a sane default in case KDGKBMODE fails? */
    if (!IS_CONSOLE(tty)) {
        return SDL_SetError("Tried to mute an invalid tty");
    }
    ioctl(tty, KDGKBMODE, kb_mode); /* It's not fatal if this fails */
    if (ioctl(tty, KDSKBMUTE, 1) && ioctl(tty, KDSKBMODE, K_OFF)) {
        return SDL_SetError("EVDEV: Failed muting keyboard");
    }
    
    return 0;  
}

/* Restore the keyboard mode for given tty */
static void SDL_EVDEV_unmute_keyboard(int tty, int kb_mode)
{
    if (ioctl(tty, KDSKBMUTE, 0) && ioctl(tty, KDSKBMODE, kb_mode)) {
        SDL_Log("EVDEV: Failed restoring keyboard mode");
    }
}

/* Read /sys/class/tty/tty0/active and open the tty */
static int SDL_EVDEV_get_active_tty()
{
    int fd, len;
    char ttyname[NAME_MAX + 1];
    char ttypath[PATH_MAX+1] = "/dev/";
    char arg;
    
    fd = open("/sys/class/tty/tty0/active", O_RDONLY);
    if (fd < 0) {
        return SDL_SetError("Could not determine which tty is active");
    }
    
    len = read(fd, ttyname, NAME_MAX);
    close(fd);
    
    if (len <= 0) {
        return SDL_SetError("Could not read which tty is active");
    }
    
    if (ttyname[len-1] == '\n') {
        ttyname[len-1] = '\0';
    }
    else {
        ttyname[len] = '\0';
    }
    
    SDL_strlcat(ttypath, ttyname, PATH_MAX);
    fd = open(ttypath, O_RDWR | O_NOCTTY);
    if (fd < 0) {
        return SDL_SetError("Could not open tty: %s", ttypath);
    }
    
    if (!IS_CONSOLE(fd)) {
        close(fd);
        return SDL_SetError("Invalid tty obtained: %s", ttypath);
    }

    return fd;  
}

int
SDL_EVDEV_Init(void)
{
    int retval = 0;
    
    if (_this == NULL) {
        
        _this = (SDL_EVDEV_PrivateData *) SDL_calloc(1, sizeof(*_this));
        if(_this == NULL) {
        _this = (SDL_EVDEV_PrivateData*)SDL_calloc(1, sizeof(*_this));
        if (_this == NULL) {
            return SDL_OutOfMemory();
        }

@@ -469,36 +155,26 @@

        /* Set up the udev callback */
        if (SDL_UDEV_AddCallback(SDL_EVDEV_udev_callback) < 0) {
            SDL_EVDEV_Quit();
            SDL_UDEV_Quit();
            SDL_free(_this);
            _this = NULL;
            return -1;
        }
        

        /* Force a scan to build the initial device list */
        SDL_UDEV_Scan();
#else
        /* TODO: Scan the devices manually, like a caveman */
#endif /* SDL_USE_LIBUDEV */
        
        /* We need a physical terminal (not PTS) to be able to translate key code to symbols via the kernel tables */
        _this->console_fd = SDL_EVDEV_get_console_fd();
        
        /* Mute the keyboard so keystrokes only generate evdev events and do not leak through to the console */
        _this->tty = STDIN_FILENO;
        if (SDL_EVDEV_mute_keyboard(_this->tty, &_this->kb_mode) < 0) {
            /* stdin is not a tty, probably we were launched remotely, so we try to disable the active tty */
            _this->tty = SDL_EVDEV_get_active_tty();
            if (_this->tty >= 0) {
                if (SDL_EVDEV_mute_keyboard(_this->tty, &_this->kb_mode) < 0) {
                    close(_this->tty);
                    _this->tty = -1;
                }
            }
        }

        _this->kbd = SDL_EVDEV_kbd_init();
    }
    

    SDL_GetMouse()->SetRelativeMouseMode = SDL_EVDEV_SetRelativeMouseMode;

    _this->ref_count += 1;
    
    return retval;

    return 0;
}

void
@@ -507,81 +183,66 @@
    if (_this == NULL) {
        return;
    }
    

    _this->ref_count -= 1;
    

    if (_this->ref_count < 1) {
        
#if SDL_USE_LIBUDEV
        SDL_UDEV_DelCallback(SDL_EVDEV_udev_callback);
        SDL_UDEV_Quit();
#endif /* SDL_USE_LIBUDEV */
       
        if (_this->console_fd >= 0) {
            close(_this->console_fd);
        }
        
        if (_this->tty >= 0) {
            SDL_EVDEV_unmute_keyboard(_this->tty, _this->kb_mode);
            close(_this->tty);
        }
        

        SDL_EVDEV_kbd_quit(_this->kbd);

        /* Remove existing devices */
        while(_this->first != NULL) {
            SDL_EVDEV_device_removed(_this->first->path);
        }
        

        SDL_assert(_this->first == NULL);
        SDL_assert(_this->last == NULL);
        SDL_assert(_this->numdevices == 0);
        
        SDL_assert(_this->num_devices == 0);

        SDL_free(_this);
        _this = NULL;
    }
}

#if SDL_USE_LIBUDEV
void SDL_EVDEV_udev_callback(SDL_UDEV_deviceevent udev_type, int udev_class, const char *devpath)
static void SDL_EVDEV_udev_callback(SDL_UDEV_deviceevent udev_event, int udev_class,
    const char* dev_path)
{
    if (devpath == NULL) {
    if (dev_path == NULL) {
        return;
    }
    
    switch(udev_type) {

    switch(udev_event) {
    case SDL_UDEV_DEVICEADDED:
        if (!(udev_class & (SDL_UDEV_DEVICE_MOUSE|SDL_UDEV_DEVICE_KEYBOARD))) {
        if (!(udev_class & (SDL_UDEV_DEVICE_MOUSE | SDL_UDEV_DEVICE_KEYBOARD |
            SDL_UDEV_DEVICE_TOUCHSCREEN)))
            return;
        }
        SDL_EVDEV_device_added(devpath);
        break;
            

        SDL_EVDEV_device_added(dev_path, udev_class);
        break;  
    case SDL_UDEV_DEVICEREMOVED:
        SDL_EVDEV_device_removed(devpath);
        SDL_EVDEV_device_removed(dev_path);
        break;
            
    default:
        break;
    }
}

#endif /* SDL_USE_LIBUDEV */

void 
SDL_EVDEV_Poll(void)
{
    struct input_event events[32];
    int i, len;
    int i, j, len;
    SDL_evdevlist_item *item;
    SDL_Scancode scan_code;
    int mouse_button;
    SDL_Mouse *mouse;
#ifdef SDL_INPUT_LINUXKD
    Uint16 modstate;
    struct kbentry kbe;
    static char keysym[8];
    char *end;
    Uint32 kval;
#endif
    float norm_x, norm_y, norm_pressure;

    if (!_this) {
        return;
@@ -597,6 +258,13 @@
        while ((len = read(item->fd, events, (sizeof events))) > 0) {
            len /= sizeof(events[0]);
            for (i = 0; i < len; ++i) {
                /* special handling for touchscreen, that should eventually be
                   used for all devices */
                if (item->out_of_sync && item->is_touchscreen &&
                    events[i].type == EV_SYN && events[i].code != SYN_REPORT) {
                    break;
                }

                switch (events[i].type) {
                case EV_KEY:
                    if (events[i].code >= BTN_MOUSE && events[i].code < BTN_MOUSE + SDL_arraysize(EVDEV_MouseButtons)) {
@@ -609,63 +277,87 @@
                        break;
                    }

                    /* BTH_TOUCH event value 1 indicates there is contact with
                       a touchscreen or trackpad (earlist finger's current
                       position is sent in EV_ABS ABS_X/ABS_Y, switching to
                       next finger after earlist is released) */
                    if (item->is_touchscreen && events[i].code == BTN_TOUCH) {
                        if (item->touchscreen_data->max_slots == 1) {
                            if (events[i].value)
                                item->touchscreen_data->slots[0].delta = EVDEV_TOUCH_SLOTDELTA_DOWN;
                            else
                                item->touchscreen_data->slots[0].delta = EVDEV_TOUCH_SLOTDELTA_UP;
                        }
                        break;
                    }

                    /* Probably keyboard */
                    scan_code = SDL_EVDEV_translate_keycode(events[i].code);
                    if (scan_code != SDL_SCANCODE_UNKNOWN) {
                        if (events[i].value == 0) {
                            SDL_SendKeyboardKey(SDL_RELEASED, scan_code);
                        } else if (events[i].value == 1 || events[i].value == 2 /* Key repeated */) {
                        } else if (events[i].value == 1 || events[i].value == 2 /* key repeated */) {
                            SDL_SendKeyboardKey(SDL_PRESSED, scan_code);
#ifdef SDL_INPUT_LINUXKD
                            if (_this->console_fd >= 0) {
                                kbe.kb_index = events[i].code;
                                /* Convert the key to an UTF-8 char */
                                /* Ref: http://www.linuxjournal.com/article/2783 */
                                modstate = SDL_GetModState();
                                kbe.kb_table = 0;
                                
                                /* Ref: http://graphics.stanford.edu/~seander/bithacks.html#ConditionalSetOrClearBitsWithoutBranching */
                                kbe.kb_table |= -((modstate & KMOD_LCTRL) != 0) & (1 << KG_CTRLL | 1 << KG_CTRL);
                                kbe.kb_table |= -((modstate & KMOD_RCTRL) != 0) & (1 << KG_CTRLR | 1 << KG_CTRL);
                                kbe.kb_table |= -((modstate & KMOD_LSHIFT) != 0) & (1 << KG_SHIFTL | 1 << KG_SHIFT);
                                kbe.kb_table |= -((modstate & KMOD_RSHIFT) != 0) & (1 << KG_SHIFTR | 1 << KG_SHIFT);
                                kbe.kb_table |= -((modstate & KMOD_LALT) != 0) & (1 << KG_ALT);
                                kbe.kb_table |= -((modstate & KMOD_RALT) != 0) & (1 << KG_ALTGR);

                                if (ioctl(_this->console_fd, KDGKBENT, (unsigned long)&kbe) == 0 && 
                                    ((KTYP(kbe.kb_value) == KT_LATIN) || (KTYP(kbe.kb_value) == KT_ASCII) || (KTYP(kbe.kb_value) == KT_LETTER))) 
                                {
                                    kval = KVAL(kbe.kb_value);
                                    
                                    /* While there's a KG_CAPSSHIFT symbol, it's not useful to build the table index with it
                                     * because 1 << KG_CAPSSHIFT overflows the 8 bits of kb_table 
                                     * So, we do the CAPS LOCK logic here. Note that isalpha depends on the locale!
                                     */
                                    if (modstate & KMOD_CAPS && isalpha(kval)) {
                                        if (isupper(kval)) {
                                            kval = tolower(kval);
                                        } else {
                                            kval = toupper(kval);
                                        }
                                    }
                                     
                                    /* Convert to UTF-8 and send */
                                    end = SDL_UCS4ToUTF8(kval, keysym);
                                    *end = '\0';
                                    SDL_SendKeyboardText(keysym);
                                }
                            }
#endif /* SDL_INPUT_LINUXKD */
                        }
                    }
                    SDL_EVDEV_kbd_keycode(_this->kbd, events[i].code, events[i].value);
                    break;
                case EV_ABS:
                    switch(events[i].code) {
                    case ABS_MT_SLOT:
                        if (!item->is_touchscreen) /* FIXME: temp hack */
                            break;
                        item->touchscreen_data->current_slot = events[i].value;
                        break;
                    case ABS_MT_TRACKING_ID:
                        if (!item->is_touchscreen) /* FIXME: temp hack */
                            break;
                        if (events[i].value >= 0) {
                            item->touchscreen_data->slots[item->touchscreen_data->current_slot].tracking_id = events[i].value;
                            item->touchscreen_data->slots[item->touchscreen_data->current_slot].delta = EVDEV_TOUCH_SLOTDELTA_DOWN;
                        } else {
                            item->touchscreen_data->slots[item->touchscreen_data->current_slot].delta = EVDEV_TOUCH_SLOTDELTA_UP;
                        }
                        break;
                    case ABS_MT_POSITION_X:
                        if (!item->is_touchscreen) /* FIXME: temp hack */
                            break;
                        item->touchscreen_data->slots[item->touchscreen_data->current_slot].x = events[i].value;
                        if (item->touchscreen_data->slots[item->touchscreen_data->current_slot].delta == EVDEV_TOUCH_SLOTDELTA_NONE) {
                            item->touchscreen_data->slots[item->touchscreen_data->current_slot].delta = EVDEV_TOUCH_SLOTDELTA_MOVE;
                        }
                        break;
                    case ABS_MT_POSITION_Y:
                        if (!item->is_touchscreen) /* FIXME: temp hack */
                            break;
                        item->touchscreen_data->slots[item->touchscreen_data->current_slot].y = events[i].value;
                        if (item->touchscreen_data->slots[item->touchscreen_data->current_slot].delta == EVDEV_TOUCH_SLOTDELTA_NONE) {
                            item->touchscreen_data->slots[item->touchscreen_data->current_slot].delta = EVDEV_TOUCH_SLOTDELTA_MOVE;
                        }
                        break;
                    case ABS_MT_PRESSURE:
                        if (!item->is_touchscreen) /* FIXME: temp hack */
                            break;
                        item->touchscreen_data->slots[item->touchscreen_data->current_slot].pressure = events[i].value;
                        if (item->touchscreen_data->slots[item->touchscreen_data->current_slot].delta == EVDEV_TOUCH_SLOTDELTA_NONE) {
                            item->touchscreen_data->slots[item->touchscreen_data->current_slot].delta = EVDEV_TOUCH_SLOTDELTA_MOVE;
                        }
                        break;
                    case ABS_X:
                        SDL_SendMouseMotion(mouse->focus, mouse->mouseID, SDL_FALSE, events[i].value, mouse->y);
                        if (item->is_touchscreen) {
                            if (item->touchscreen_data->max_slots != 1)
                                break;
                            item->touchscreen_data->slots[0].x = events[i].value;
                        } else
                            SDL_SendMouseMotion(mouse->focus, mouse->mouseID, SDL_FALSE, events[i].value, mouse->y);
                        break;
                    case ABS_Y:
                        SDL_SendMouseMotion(mouse->focus, mouse->mouseID, SDL_FALSE, mouse->x, events[i].value);
                        if (item->is_touchscreen) {
                            if (item->touchscreen_data->max_slots != 1)
                                break;
                            item->touchscreen_data->slots[0].y = events[i].value;
                        } else
                            SDL_SendMouseMotion(mouse->focus, mouse->mouseID, SDL_FALSE, mouse->x, events[i].value);
                        break;
                    default:
                        break;
@@ -691,7 +383,52 @@
                    break;
                case EV_SYN:
                    switch (events[i].code) {
                    case SYN_REPORT:
                        if (!item->is_touchscreen) /* FIXME: temp hack */
                            break;

                        for(j = 0; j < item->touchscreen_data->max_slots; j++) {
                            norm_x = (float)(item->touchscreen_data->slots[j].x - item->touchscreen_data->min_x) /
                                (float)item->touchscreen_data->range_x;
                            norm_y = (float)(item->touchscreen_data->slots[j].y - item->touchscreen_data->min_y) /
                                (float)item->touchscreen_data->range_y;

                            if (item->touchscreen_data->range_pressure > 0) {
                                norm_pressure = (float)(item->touchscreen_data->slots[j].pressure - item->touchscreen_data->min_pressure) /
                                    (float)item->touchscreen_data->range_pressure;
                            } else {
                                /* This touchscreen does not support pressure */
                                norm_pressure = 1.0f;
                            }

                            /* FIXME: the touch's window shouldn't be null, but
                             * the coordinate space of touch positions needs to
                             * be window-relative in that case. */
                            switch(item->touchscreen_data->slots[j].delta) {
                            case EVDEV_TOUCH_SLOTDELTA_DOWN:
                                SDL_SendTouch(item->fd, item->touchscreen_data->slots[j].tracking_id, NULL, SDL_TRUE, norm_x, norm_y, norm_pressure);
                                item->touchscreen_data->slots[j].delta = EVDEV_TOUCH_SLOTDELTA_NONE;
                                break;
                            case EVDEV_TOUCH_SLOTDELTA_UP:
                                SDL_SendTouch(item->fd, item->touchscreen_data->slots[j].tracking_id, NULL, SDL_FALSE, norm_x, norm_y, norm_pressure);
                                item->touchscreen_data->slots[j].tracking_id = -1;
                                item->touchscreen_data->slots[j].delta = EVDEV_TOUCH_SLOTDELTA_NONE;
                                break;
                            case EVDEV_TOUCH_SLOTDELTA_MOVE:
                                SDL_SendTouchMotion(item->fd, item->touchscreen_data->slots[j].tracking_id, NULL, norm_x, norm_y, norm_pressure);
                                item->touchscreen_data->slots[j].delta = EVDEV_TOUCH_SLOTDELTA_NONE;
                                break;
                            default:
                                break;
                            }
                        }

                        if (item->out_of_sync)
                            item->out_of_sync = 0;
                        break;
                    case SYN_DROPPED:
                        if (item->is_touchscreen)
                            item->out_of_sync = 1;
                        SDL_EVDEV_sync_device(item);
                        break;
                    default:
@@ -709,77 +446,327 @@
{
    SDL_Scancode scancode = SDL_SCANCODE_UNKNOWN;

    if (keycode < SDL_arraysize(EVDEV_Keycodes)) {
        scancode = EVDEV_Keycodes[keycode];
    if (keycode < SDL_arraysize(linux_scancode_table)) {
        scancode = linux_scancode_table[keycode];

        if (scancode == SDL_SCANCODE_UNKNOWN) {
            /* BTN_TOUCH is handled elsewhere, but we might still end up here if
               you get an unexpected BTN_TOUCH from something SDL believes is not
               a touch device. In this case, we'd rather not get a misleading
               SDL_Log message about an unknown key. */
            if (keycode != BTN_TOUCH) {
                SDL_Log("The key you just pressed is not recognized by SDL. To help "
                    "get this fixed, please report this to the SDL forums/mailing list "
                    "<https://discourse.libsdl.org/> EVDEV KeyCode %d", keycode);
            }
        }
    }
    if (scancode == SDL_SCANCODE_UNKNOWN) {
        SDL_Log("The key you just pressed is not recognized by SDL. To help get this fixed, please report this to the SDL mailing list <sdl@libsdl.org> EVDEV KeyCode %d \n", keycode);
    }

    return scancode;
}

#ifdef SDL_USE_LIBUDEV
static int
SDL_EVDEV_init_touchscreen(SDL_evdevlist_item* item)
{
    int ret, i;
    unsigned long xreq, yreq;
    char name[64];
    struct input_absinfo abs_info;

    if (!item->is_touchscreen)
        return 0;

    item->touchscreen_data = SDL_calloc(1, sizeof(*item->touchscreen_data));
    if (item->touchscreen_data == NULL)
        return SDL_OutOfMemory();

    ret = ioctl(item->fd, EVIOCGNAME(sizeof(name)), name);
    if (ret < 0) {
        SDL_free(item->touchscreen_data);
        return SDL_SetError("Failed to get evdev touchscreen name");
    }

    item->touchscreen_data->name = SDL_strdup(name);
    if (item->touchscreen_data->name == NULL) {
        SDL_free(item->touchscreen_data);
        return SDL_OutOfMemory();
    }

    ret = ioctl(item->fd, EVIOCGABS(ABS_MT_SLOT), &abs_info);
    if (ret < 0) {
        SDL_free(item->touchscreen_data->name);
        SDL_free(item->touchscreen_data);
        return SDL_SetError("Failed to get evdev touchscreen limits");
    }

    if (abs_info.maximum == 0) {
        item->touchscreen_data->max_slots = 1;
        xreq = EVIOCGABS(ABS_X);
        yreq = EVIOCGABS(ABS_Y);
    } else {
        item->touchscreen_data->max_slots = abs_info.maximum + 1;
        xreq = EVIOCGABS(ABS_MT_POSITION_X);
        yreq = EVIOCGABS(ABS_MT_POSITION_Y);
    }

    ret = ioctl(item->fd, xreq, &abs_info);
    if (ret < 0) {
        SDL_free(item->touchscreen_data->name);
        SDL_free(item->touchscreen_data);
        return SDL_SetError("Failed to get evdev touchscreen limits");
    }
    item->touchscreen_data->min_x = abs_info.minimum;
    item->touchscreen_data->max_x = abs_info.maximum;
    item->touchscreen_data->range_x = abs_info.maximum - abs_info.minimum;

    ret = ioctl(item->fd, yreq, &abs_info);
    if (ret < 0) {
        SDL_free(item->touchscreen_data->name);
        SDL_free(item->touchscreen_data);
        return SDL_SetError("Failed to get evdev touchscreen limits");
    }
    item->touchscreen_data->min_y = abs_info.minimum;
    item->touchscreen_data->max_y = abs_info.maximum;
    item->touchscreen_data->range_y = abs_info.maximum - abs_info.minimum;

    ret = ioctl(item->fd, EVIOCGABS(ABS_MT_PRESSURE), &abs_info);
    if (ret < 0) {
        SDL_free(item->touchscreen_data->name);
        SDL_free(item->touchscreen_data);
        return SDL_SetError("Failed to get evdev touchscreen limits");
    }
    item->touchscreen_data->min_pressure = abs_info.minimum;
    item->touchscreen_data->max_pressure = abs_info.maximum;
    item->touchscreen_data->range_pressure = abs_info.maximum - abs_info.minimum;

    item->touchscreen_data->slots = SDL_calloc(
        item->touchscreen_data->max_slots,
        sizeof(*item->touchscreen_data->slots));
    if (item->touchscreen_data->slots == NULL) {
        SDL_free(item->touchscreen_data->name);
        SDL_free(item->touchscreen_data);
        return SDL_OutOfMemory();
    }

    for(i = 0; i < item->touchscreen_data->max_slots; i++) {
        item->touchscreen_data->slots[i].tracking_id = -1;
    }

    ret = SDL_AddTouch(item->fd, /* I guess our fd is unique enough */
        SDL_TOUCH_DEVICE_DIRECT,
        item->touchscreen_data->name);
    if (ret < 0) {
        SDL_free(item->touchscreen_data->slots);
        SDL_free(item->touchscreen_data->name);
        SDL_free(item->touchscreen_data);
        return ret;
    }

    return 0;
}
#endif /* SDL_USE_LIBUDEV */

static void
SDL_EVDEV_destroy_touchscreen(SDL_evdevlist_item* item) {
    if (!item->is_touchscreen)
        return;

    SDL_DelTouch(item->fd);
    SDL_free(item->touchscreen_data->slots);
    SDL_free(item->touchscreen_data->name);
    SDL_free(item->touchscreen_data);
}

static void
SDL_EVDEV_sync_device(SDL_evdevlist_item *item) 
{
    /* TODO: get full state of device and report whatever is required */
#ifdef EVIOCGMTSLOTS
    int i, ret;
    struct input_absinfo abs_info;
    /*
     * struct input_mt_request_layout {
     *     __u32 code;
     *     __s32 values[num_slots];
     * };
     *
     * this is the structure we're trying to emulate
     */
    Uint32* mt_req_code;
    Sint32* mt_req_values;
    size_t mt_req_size;

    /* TODO: sync devices other than touchscreen */
    if (!item->is_touchscreen)
        return;

    mt_req_size = sizeof(*mt_req_code) +
        sizeof(*mt_req_values) * item->touchscreen_data->max_slots;

    mt_req_code = SDL_calloc(1, mt_req_size);
    if (mt_req_code == NULL) {
        return;
    }

    mt_req_values = (Sint32*)mt_req_code + 1;

    *mt_req_code = ABS_MT_TRACKING_ID;
    ret = ioctl(item->fd, EVIOCGMTSLOTS(mt_req_size), mt_req_code);
    if (ret < 0) {
        SDL_free(mt_req_code);
        return;
    }
    for(i = 0; i < item->touchscreen_data->max_slots; i++) {
        /*
         * This doesn't account for the very edge case of the user removing their
         * finger and replacing it on the screen during the time we're out of sync,
         * which'll mean that we're not going from down -> up or up -> down, we're
         * going from down -> down but with a different tracking id, meaning we'd
         * have to tell SDL of the two events, but since we wait till SYN_REPORT in
         * SDL_EVDEV_Poll to tell SDL, the current structure of this code doesn't
         * allow it. Lets just pray to God it doesn't happen.
         */
        if (item->touchscreen_data->slots[i].tracking_id < 0 &&
            mt_req_values[i] >= 0) {
            item->touchscreen_data->slots[i].tracking_id = mt_req_values[i];
            item->touchscreen_data->slots[i].delta = EVDEV_TOUCH_SLOTDELTA_DOWN;
        } else if (item->touchscreen_data->slots[i].tracking_id >= 0 &&
            mt_req_values[i] < 0) {
            item->touchscreen_data->slots[i].tracking_id = -1;
            item->touchscreen_data->slots[i].delta = EVDEV_TOUCH_SLOTDELTA_UP;
        }
    }

    *mt_req_code = ABS_MT_POSITION_X;
    ret = ioctl(item->fd, EVIOCGMTSLOTS(mt_req_size), mt_req_code);
    if (ret < 0) {
        SDL_free(mt_req_code);
        return;
    }
    for(i = 0; i < item->touchscreen_data->max_slots; i++) {
        if (item->touchscreen_data->slots[i].tracking_id >= 0 &&
            item->touchscreen_data->slots[i].x != mt_req_values[i]) {
            item->touchscreen_data->slots[i].x = mt_req_values[i];
            if (item->touchscreen_data->slots[i].delta ==
                EVDEV_TOUCH_SLOTDELTA_NONE) {
                item->touchscreen_data->slots[i].delta =
                    EVDEV_TOUCH_SLOTDELTA_MOVE;
            }
        }
    }

    *mt_req_code = ABS_MT_POSITION_Y;
    ret = ioctl(item->fd, EVIOCGMTSLOTS(mt_req_size), mt_req_code);
    if (ret < 0) {
        SDL_free(mt_req_code);
        return;
    }
    for(i = 0; i < item->touchscreen_data->max_slots; i++) {
        if (item->touchscreen_data->slots[i].tracking_id >= 0 &&
            item->touchscreen_data->slots[i].y != mt_req_values[i]) {
            item->touchscreen_data->slots[i].y = mt_req_values[i];
            if (item->touchscreen_data->slots[i].delta ==
                EVDEV_TOUCH_SLOTDELTA_NONE) {
                item->touchscreen_data->slots[i].delta =
                    EVDEV_TOUCH_SLOTDELTA_MOVE;
            }
        }
    }

    *mt_req_code = ABS_MT_PRESSURE;
    ret = ioctl(item->fd, EVIOCGMTSLOTS(mt_req_size), mt_req_code);
    if (ret < 0) {
        SDL_free(mt_req_code);
        return;
    }
    for(i = 0; i < item->touchscreen_data->max_slots; i++) {
        if (item->touchscreen_data->slots[i].tracking_id >= 0 &&
            item->touchscreen_data->slots[i].pressure != mt_req_values[i]) {
            item->touchscreen_data->slots[i].pressure = mt_req_values[i];
            if (item->touchscreen_data->slots[i].delta ==
                EVDEV_TOUCH_SLOTDELTA_NONE) {
                item->touchscreen_data->slots[i].delta =
                    EVDEV_TOUCH_SLOTDELTA_MOVE;
            }
        }
    }

    ret = ioctl(item->fd, EVIOCGABS(ABS_MT_SLOT), &abs_info);
    if (ret < 0) {
        SDL_free(mt_req_code);
        return;
    }
    item->touchscreen_data->current_slot = abs_info.value;

    SDL_free(mt_req_code);

#endif /* EVIOCGMTSLOTS */
}

#if SDL_USE_LIBUDEV
static int
SDL_EVDEV_device_added(const char *devpath)
SDL_EVDEV_device_added(const char *dev_path, int udev_class)
{
    int ret;
    SDL_evdevlist_item *item;

    /* Check to make sure it's not already in list. */
    for (item = _this->first; item != NULL; item = item->next) {
        if (SDL_strcmp(devpath, item->path) == 0) {
        if (SDL_strcmp(dev_path, item->path) == 0) {
            return -1;  /* already have this one */
        }
    }
    

    item = (SDL_evdevlist_item *) SDL_calloc(1, sizeof (SDL_evdevlist_item));
    if (item == NULL) {
        return SDL_OutOfMemory();
    }

    item->fd = open(devpath, O_RDONLY, 0);
    item->fd = open(dev_path, O_RDONLY | O_NONBLOCK);
    if (item->fd < 0) {
        SDL_free(item);
        return SDL_SetError("Unable to open %s", devpath);
        return SDL_SetError("Unable to open %s", dev_path);
    }
    
    item->path = SDL_strdup(devpath);

    item->path = SDL_strdup(dev_path);
    if (item->path == NULL) {
        close(item->fd);
        SDL_free(item);
        return SDL_OutOfMemory();
    }
    
    /* Non blocking read mode */
    fcntl(item->fd, F_SETFL, O_NONBLOCK);
    

    if (udev_class & SDL_UDEV_DEVICE_TOUCHSCREEN) {
        item->is_touchscreen = 1;

        if ((ret = SDL_EVDEV_init_touchscreen(item)) < 0) {
            close(item->fd);
            SDL_free(item);
            return ret;
        }
    }

    if (_this->last == NULL) {
        _this->first = _this->last = item;
    } else {
        _this->last->next = item;
        _this->last = item;
    }
    

    SDL_EVDEV_sync_device(item);
    
    return _this->numdevices++;

    return _this->num_devices++;
}
#endif /* SDL_USE_LIBUDEV */

static int
SDL_EVDEV_device_removed(const char *devpath)
SDL_EVDEV_device_removed(const char *dev_path)
{
    SDL_evdevlist_item *item;
    SDL_evdevlist_item *prev = NULL;

    for (item = _this->first; item != NULL; item = item->next) {
        /* found it, remove it. */
        if (SDL_strcmp(devpath, item->path) == 0) {
        if (SDL_strcmp(dev_path, item->path) == 0) {
            if (prev != NULL) {
                prev->next = item->next;
            } else {
@@ -789,10 +776,13 @@
            if (item == _this->last) {
                _this->last = prev;
            }
            if (item->is_touchscreen) {
                SDL_EVDEV_destroy_touchscreen(item);
            }
            close(item->fd);
            SDL_free(item->path);
            SDL_free(item);
            _this->numdevices--;
            _this->num_devices--;
            return 0;
        }
        prev = item;
@@ -805,4 +795,3 @@
#endif /* SDL_INPUT_LINUXEV */

/* vi: set ts=4 sw=4 expandtab: */