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SDL_evdev.c
698 lines (606 loc) · 23.6 KB
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/*
Simple DirectMedia Layer
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Copyright (C) 1997-2017 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
#ifdef SDL_INPUT_LINUXEV
/* This is based on the linux joystick driver */
/* References: https://www.kernel.org/doc/Documentation/input/input.txt
* https://www.kernel.org/doc/Documentation/input/event-codes.txt
* /usr/include/linux/input.h
* The evtest application is also useful to debug the protocol
*/
#include "SDL_evdev.h"
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#include "SDL_evdev_kbd.h"
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#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/input.h>
#include "SDL.h"
#include "SDL_assert.h"
#include "SDL_endian.h"
#include "SDL_scancode.h"
#include "../../events/SDL_events_c.h"
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#include "../../events/scancodes_linux.h" /* adds linux_scancode_table */
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#include "../../core/linux/SDL_udev.h"
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/* These are not defined in older Linux kernel headers */
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#ifndef SYN_DROPPED
#define SYN_DROPPED 3
#endif
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#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
#endif
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typedef struct SDL_evdevlist_item
{
char *path;
int fd;
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/* TODO: use this for every device, not just touchscreen */
int out_of_sync;
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/* 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;
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int min_x, max_x, range_x;
int min_y, max_y, range_y;
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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;
} * slots;
} * touchscreen_data;
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struct SDL_evdevlist_item *next;
} SDL_evdevlist_item;
typedef struct SDL_EVDEV_PrivateData
{
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int ref_count;
int num_devices;
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SDL_evdevlist_item *first;
SDL_evdevlist_item *last;
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SDL_EVDEV_keyboard_state *kbd;
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} SDL_EVDEV_PrivateData;
#define _THIS SDL_EVDEV_PrivateData *_this
static _THIS = NULL;
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static SDL_Scancode SDL_EVDEV_translate_keycode(int keycode);
static void SDL_EVDEV_sync_device(SDL_evdevlist_item *item);
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static int SDL_EVDEV_device_removed(const char *dev_path);
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#if SDL_USE_LIBUDEV
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static int SDL_EVDEV_device_added(const char *dev_path, int udev_class);
void SDL_EVDEV_udev_callback(SDL_UDEV_deviceevent udev_type, int udev_class,
const char *dev_path);
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#endif /* SDL_USE_LIBUDEV */
static Uint8 EVDEV_MouseButtons[] = {
SDL_BUTTON_LEFT, /* BTN_LEFT 0x110 */
SDL_BUTTON_RIGHT, /* BTN_RIGHT 0x111 */
SDL_BUTTON_MIDDLE, /* BTN_MIDDLE 0x112 */
SDL_BUTTON_X1, /* BTN_SIDE 0x113 */
SDL_BUTTON_X2, /* BTN_EXTRA 0x114 */
SDL_BUTTON_X2 + 1, /* BTN_FORWARD 0x115 */
SDL_BUTTON_X2 + 2, /* BTN_BACK 0x116 */
SDL_BUTTON_X2 + 3 /* BTN_TASK 0x117 */
};
int
SDL_EVDEV_Init(void)
{
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if (_this == NULL) {
_this = (SDL_EVDEV_PrivateData*)SDL_calloc(1, sizeof(*_this));
if (_this == NULL) {
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return SDL_OutOfMemory();
}
#if SDL_USE_LIBUDEV
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if (SDL_UDEV_Init() < 0) {
SDL_free(_this);
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_this = NULL;
return -1;
}
/* Set up the udev callback */
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if (SDL_UDEV_AddCallback(SDL_EVDEV_udev_callback) < 0) {
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SDL_UDEV_Quit();
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SDL_free(_this);
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_this = NULL;
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return -1;
}
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/* 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 */
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_this->kbd = SDL_EVDEV_kbd_init();
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}
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_this->ref_count += 1;
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return 0;
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}
void
SDL_EVDEV_Quit(void)
{
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if (_this == NULL) {
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return;
}
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_this->ref_count -= 1;
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if (_this->ref_count < 1) {
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#if SDL_USE_LIBUDEV
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SDL_UDEV_DelCallback(SDL_EVDEV_udev_callback);
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SDL_UDEV_Quit();
#endif /* SDL_USE_LIBUDEV */
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SDL_EVDEV_kbd_quit(_this->kbd);
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/* Remove existing devices */
while(_this->first != NULL) {
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SDL_EVDEV_device_removed(_this->first->path);
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}
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SDL_assert(_this->first == NULL);
SDL_assert(_this->last == NULL);
SDL_assert(_this->num_devices == 0);
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SDL_free(_this);
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_this = NULL;
}
}
#if SDL_USE_LIBUDEV
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void SDL_EVDEV_udev_callback(SDL_UDEV_deviceevent udev_event, int udev_class,
const char* dev_path)
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{
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if (dev_path == NULL) {
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return;
}
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switch(udev_event) {
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case SDL_UDEV_DEVICEADDED:
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if (!(udev_class & (SDL_UDEV_DEVICE_MOUSE | SDL_UDEV_DEVICE_KEYBOARD |
SDL_UDEV_DEVICE_TOUCHSCREEN)))
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return;
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SDL_EVDEV_device_added(dev_path, udev_class);
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break;
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case SDL_UDEV_DEVICEREMOVED:
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SDL_EVDEV_device_removed(dev_path);
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break;
default:
break;
}
}
#endif /* SDL_USE_LIBUDEV */
void
SDL_EVDEV_Poll(void)
{
struct input_event events[32];
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int i, j, len;
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SDL_evdevlist_item *item;
SDL_Scancode scan_code;
int mouse_button;
SDL_Mouse *mouse;
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float norm_x, norm_y;
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if (!_this) {
return;
}
#if SDL_USE_LIBUDEV
SDL_UDEV_Poll();
#endif
mouse = SDL_GetMouse();
for (item = _this->first; item != NULL; item = item->next) {
while ((len = read(item->fd, events, (sizeof events))) > 0) {
len /= sizeof(events[0]);
for (i = 0; i < len; ++i) {
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/* special handling for touchscreen, that should eventually be
used for all devices */
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if (item->out_of_sync && item->is_touchscreen &&
events[i].type == EV_SYN && events[i].code != SYN_REPORT) {
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break;
}
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switch (events[i].type) {
case EV_KEY:
if (events[i].code >= BTN_MOUSE && events[i].code < BTN_MOUSE + SDL_arraysize(EVDEV_MouseButtons)) {
mouse_button = events[i].code - BTN_MOUSE;
if (events[i].value == 0) {
SDL_SendMouseButton(mouse->focus, mouse->mouseID, SDL_RELEASED, EVDEV_MouseButtons[mouse_button]);
} else if (events[i].value == 1) {
SDL_SendMouseButton(mouse->focus, mouse->mouseID, SDL_PRESSED, EVDEV_MouseButtons[mouse_button]);
}
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);
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} else if (events[i].value == 1 || events[i].value == 2 /* key repeated */) {
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SDL_SendKeyboardKey(SDL_PRESSED, scan_code);
}
}
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SDL_EVDEV_kbd_keycode(_this->kbd, events[i].code, events[i].value);
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break;
case EV_ABS:
switch(events[i].code) {
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case ABS_MT_SLOT:
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if (!item->is_touchscreen) /* FIXME: temp hack */
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break;
item->touchscreen_data->current_slot = events[i].value;
break;
case ABS_MT_TRACKING_ID:
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if (!item->is_touchscreen) /* FIXME: temp hack */
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break;
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if (events[i].value >= 0) {
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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:
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if (!item->is_touchscreen) /* FIXME: temp hack */
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break;
item->touchscreen_data->slots[item->touchscreen_data->current_slot].x = events[i].value;
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if (item->touchscreen_data->slots[item->touchscreen_data->current_slot].delta == EVDEV_TOUCH_SLOTDELTA_NONE) {
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item->touchscreen_data->slots[item->touchscreen_data->current_slot].delta = EVDEV_TOUCH_SLOTDELTA_MOVE;
}
break;
case ABS_MT_POSITION_Y:
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if (!item->is_touchscreen) /* FIXME: temp hack */
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break;
item->touchscreen_data->slots[item->touchscreen_data->current_slot].y = events[i].value;
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if (item->touchscreen_data->slots[item->touchscreen_data->current_slot].delta == EVDEV_TOUCH_SLOTDELTA_NONE) {
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item->touchscreen_data->slots[item->touchscreen_data->current_slot].delta = EVDEV_TOUCH_SLOTDELTA_MOVE;
}
break;
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case ABS_X:
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if (item->is_touchscreen) /* FIXME: temp hack */
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break;
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SDL_SendMouseMotion(mouse->focus, mouse->mouseID, SDL_FALSE, events[i].value, mouse->y);
break;
case ABS_Y:
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if (item->is_touchscreen) /* FIXME: temp hack */
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break;
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SDL_SendMouseMotion(mouse->focus, mouse->mouseID, SDL_FALSE, mouse->x, events[i].value);
break;
default:
break;
}
break;
case EV_REL:
switch(events[i].code) {
case REL_X:
SDL_SendMouseMotion(mouse->focus, mouse->mouseID, SDL_TRUE, events[i].value, 0);
break;
case REL_Y:
SDL_SendMouseMotion(mouse->focus, mouse->mouseID, SDL_TRUE, 0, events[i].value);
break;
case REL_WHEEL:
SDL_SendMouseWheel(mouse->focus, mouse->mouseID, 0, events[i].value, SDL_MOUSEWHEEL_NORMAL);
break;
case REL_HWHEEL:
SDL_SendMouseWheel(mouse->focus, mouse->mouseID, events[i].value, 0, SDL_MOUSEWHEEL_NORMAL);
break;
default:
break;
}
break;
case EV_SYN:
switch (events[i].code) {
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case SYN_REPORT:
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if (!item->is_touchscreen) /* FIXME: temp hack */
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break;
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for(j = 0; j < item->touchscreen_data->max_slots; j++) {
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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;
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switch(item->touchscreen_data->slots[j].delta) {
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case EVDEV_TOUCH_SLOTDELTA_DOWN:
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SDL_SendTouch(item->fd, item->touchscreen_data->slots[j].tracking_id, SDL_TRUE, norm_x, norm_y, 1.0f);
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item->touchscreen_data->slots[j].delta = EVDEV_TOUCH_SLOTDELTA_NONE;
break;
case EVDEV_TOUCH_SLOTDELTA_UP:
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SDL_SendTouch(item->fd, item->touchscreen_data->slots[j].tracking_id, SDL_FALSE, norm_x, norm_y, 1.0f);
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item->touchscreen_data->slots[j].tracking_id = -1;
item->touchscreen_data->slots[j].delta = EVDEV_TOUCH_SLOTDELTA_NONE;
break;
case EVDEV_TOUCH_SLOTDELTA_MOVE:
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SDL_SendTouchMotion(item->fd, item->touchscreen_data->slots[j].tracking_id, norm_x, norm_y, 1.0f);
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item->touchscreen_data->slots[j].delta = EVDEV_TOUCH_SLOTDELTA_NONE;
break;
default:
break;
}
}
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if (item->out_of_sync)
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item->out_of_sync = 0;
break;
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case SYN_DROPPED:
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if (item->is_touchscreen)
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item->out_of_sync = 1;
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SDL_EVDEV_sync_device(item);
break;
default:
break;
}
break;
}
}
}
}
}
static SDL_Scancode
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SDL_EVDEV_translate_keycode(int keycode)
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{
SDL_Scancode scancode = SDL_SCANCODE_UNKNOWN;
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if (keycode < SDL_arraysize(linux_scancode_table))
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scancode = linux_scancode_table[keycode];
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if (scancode == SDL_SCANCODE_UNKNOWN) {
SDL_Log("The key you just pressed is not recognized by SDL. To help "
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"get this fixed, please report this to the SDL mailing list "
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"<sdl@libsdl.org> EVDEV KeyCode %d\n", keycode);
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}
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return scancode;
}
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#ifdef SDL_USE_LIBUDEV
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static int
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SDL_EVDEV_init_touchscreen(SDL_evdevlist_item* item)
{
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int ret, i;
char name[64];
struct input_absinfo abs_info;
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if (!item->is_touchscreen)
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return 0;
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item->touchscreen_data = SDL_calloc(1, sizeof(*item->touchscreen_data));
if (item->touchscreen_data == NULL)
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return SDL_OutOfMemory();
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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");
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}
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item->touchscreen_data->name = SDL_strdup(name);
if (item->touchscreen_data->name == NULL) {
SDL_free(item->touchscreen_data);
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return SDL_OutOfMemory();
}
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ret = ioctl(item->fd, EVIOCGABS(ABS_MT_POSITION_X), &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");
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}
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;
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ret = ioctl(item->fd, EVIOCGABS(ABS_MT_POSITION_Y), &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");
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}
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;
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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");
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}
item->touchscreen_data->max_slots = abs_info.maximum + 1;
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item->touchscreen_data->slots = SDL_calloc(
item->touchscreen_data->max_slots,
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sizeof(*item->touchscreen_data->slots));
if (item->touchscreen_data->slots == NULL) {
SDL_free(item->touchscreen_data->name);
SDL_free(item->touchscreen_data);
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return SDL_OutOfMemory();
}
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for(i = 0; i < item->touchscreen_data->max_slots; i++) {
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item->touchscreen_data->slots[i].tracking_id = -1;
}
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ret = SDL_AddTouch(item->fd, /* I guess our fd is unique enough */
item->touchscreen_data->name);
if (ret < 0) {
SDL_free(item->touchscreen_data->slots);
SDL_free(item->touchscreen_data->name);
SDL_free(item->touchscreen_data);
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return ret;
}
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return 0;
}
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#endif /* SDL_USE_LIBUDEV */
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static void
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SDL_EVDEV_destroy_touchscreen(SDL_evdevlist_item* item) {
if (!item->is_touchscreen)
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return;
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SDL_DelTouch(item->fd);
SDL_free(item->touchscreen_data->slots);
SDL_free(item->touchscreen_data->name);
SDL_free(item->touchscreen_data);
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}
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static void
SDL_EVDEV_sync_device(SDL_evdevlist_item *item)
{
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#ifdef EVIOCGMTSLOTS
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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
*/
__u32* mt_req_code;
__s32* mt_req_values;
size_t mt_req_size;
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/* TODO: sync devices other than touchscreen */
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if (!item->is_touchscreen)
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return;
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mt_req_size = sizeof(*mt_req_code) +
sizeof(*mt_req_values) * item->touchscreen_data->max_slots;
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mt_req_code = SDL_calloc(1, mt_req_size);
if (mt_req_code == NULL) {
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return;
}
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mt_req_values = (__s32*)mt_req_code + 1;
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*mt_req_code = ABS_MT_TRACKING_ID;
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ret = ioctl(item->fd, EVIOCGMTSLOTS(mt_req_size), mt_req_code);
if (ret < 0) {
SDL_free(mt_req_code);
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return;
}
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for(i = 0; i < item->touchscreen_data->max_slots; i++) {
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/*
* 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.
*/
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if (item->touchscreen_data->slots[i].tracking_id < 0 &&
mt_req_values[i] >= 0) {
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item->touchscreen_data->slots[i].tracking_id = mt_req_values[i];
item->touchscreen_data->slots[i].delta = EVDEV_TOUCH_SLOTDELTA_DOWN;
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} else if (item->touchscreen_data->slots[i].tracking_id >= 0 &&
mt_req_values[i] < 0) {
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item->touchscreen_data->slots[i].tracking_id = -1;
item->touchscreen_data->slots[i].delta = EVDEV_TOUCH_SLOTDELTA_UP;
}
}
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*mt_req_code = ABS_MT_POSITION_X;
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ret = ioctl(item->fd, EVIOCGMTSLOTS(mt_req_size), mt_req_code);
if (ret < 0) {
SDL_free(mt_req_code);
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return;
}
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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]) {
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item->touchscreen_data->slots[i].x = mt_req_values[i];
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if (item->touchscreen_data->slots[i].delta ==
EVDEV_TOUCH_SLOTDELTA_NONE) {
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item->touchscreen_data->slots[i].delta =
EVDEV_TOUCH_SLOTDELTA_MOVE;
}
}
}
576
577
*mt_req_code = ABS_MT_POSITION_Y;
578
579
580
ret = ioctl(item->fd, EVIOCGMTSLOTS(mt_req_size), mt_req_code);
if (ret < 0) {
SDL_free(mt_req_code);
581
582
return;
}
583
584
585
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]) {
586
item->touchscreen_data->slots[i].y = mt_req_values[i];
587
588
if (item->touchscreen_data->slots[i].delta ==
EVDEV_TOUCH_SLOTDELTA_NONE) {
589
590
591
592
593
item->touchscreen_data->slots[i].delta =
EVDEV_TOUCH_SLOTDELTA_MOVE;
}
}
}
594
595
596
597
ret = ioctl(item->fd, EVIOCGABS(ABS_MT_SLOT), &abs_info);
if (ret < 0) {
SDL_free(mt_req_code);
598
599
600
return;
}
item->touchscreen_data->current_slot = abs_info.value;
601
602
SDL_free(mt_req_code);
603
604
#endif /* EVIOCGMTSLOTS */
605
606
607
608
}
#if SDL_USE_LIBUDEV
static int
609
SDL_EVDEV_device_added(const char *dev_path, int udev_class)
610
{
611
int ret;
612
613
614
615
SDL_evdevlist_item *item;
/* Check to make sure it's not already in list. */
for (item = _this->first; item != NULL; item = item->next) {
616
if (SDL_strcmp(dev_path, item->path) == 0) {
617
618
619
return -1; /* already have this one */
}
}
620
621
622
623
624
625
item = (SDL_evdevlist_item *) SDL_calloc(1, sizeof (SDL_evdevlist_item));
if (item == NULL) {
return SDL_OutOfMemory();
}
626
item->fd = open(dev_path, O_RDONLY | O_NONBLOCK);
627
628
if (item->fd < 0) {
SDL_free(item);
629
return SDL_SetError("Unable to open %s", dev_path);
630
}
631
632
item->path = SDL_strdup(dev_path);
633
634
635
636
637
if (item->path == NULL) {
close(item->fd);
SDL_free(item);
return SDL_OutOfMemory();
}
638
639
if (udev_class & SDL_UDEV_DEVICE_TOUCHSCREEN) {
640
item->is_touchscreen = 1;
641
642
if ((ret = SDL_EVDEV_init_touchscreen(item)) < 0) {
643
644
645
646
647
close(item->fd);
SDL_free(item);
return ret;
}
}
648
649
650
651
652
653
654
if (_this->last == NULL) {
_this->first = _this->last = item;
} else {
_this->last->next = item;
_this->last = item;
}
655
656
SDL_EVDEV_sync_device(item);
657
658
return _this->num_devices++;
659
660
661
662
}
#endif /* SDL_USE_LIBUDEV */
static int
663
SDL_EVDEV_device_removed(const char *dev_path)
664
665
666
667
668
669
{
SDL_evdevlist_item *item;
SDL_evdevlist_item *prev = NULL;
for (item = _this->first; item != NULL; item = item->next) {
/* found it, remove it. */
670
if (SDL_strcmp(dev_path, item->path) == 0) {
671
672
673
674
675
676
677
678
679
if (prev != NULL) {
prev->next = item->next;
} else {
SDL_assert(_this->first == item);
_this->first = item->next;
}
if (item == _this->last) {
_this->last = prev;
}
680
681
if (item->is_touchscreen) {
SDL_EVDEV_destroy_touchscreen(item);
682
}
683
684
685
close(item->fd);
SDL_free(item->path);
SDL_free(item);
686
_this->num_devices--;
687
688
689
690
691
692
693
694
695
696
697
698
return 0;
}
prev = item;
}
return -1;
}
#endif /* SDL_INPUT_LINUXEV */
/* vi: set ts=4 sw=4 expandtab: */