| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2016 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 |
| 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" |
| |
| #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> |
| #include <linux/vt.h> |
| #include <linux/tiocl.h> /* for TIOCL_GETSHIFTSTATE */ |
| #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 */ |
| |
| /* This isn't defined in older Linux kernel headers */ |
| #ifndef SYN_DROPPED |
| #define SYN_DROPPED 3 |
| #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 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; |
| |
| struct SDL_evdevlist_item *next; |
| } SDL_evdevlist_item; |
| |
| typedef struct SDL_EVDEV_PrivateData |
| { |
| SDL_evdevlist_item *first; |
| SDL_evdevlist_item *last; |
| int num_devices; |
| int ref_count; |
| int console_fd; |
| int kb_mode; |
| } SDL_EVDEV_PrivateData; |
| |
| #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 *dev_path); |
| |
| #if SDL_USE_LIBUDEV |
| 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); |
| #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 */ |
| }; |
| |
| static const char* EVDEV_consoles[] = { |
| /* "/proc/self/fd/0", |
| "/dev/tty", |
| "/dev/tty0", */ /* the tty ioctl's prohibit these */ |
| "/dev/tty1", |
| "/dev/tty2", |
| "/dev/tty3", |
| "/dev/tty4", |
| "/dev/tty5", |
| "/dev/tty6", |
| "/dev/tty7", /* usually X is spawned in tty7 */ |
| "/dev/vc/0", |
| "/dev/console" |
| }; |
| |
| static int SDL_EVDEV_is_console(int fd) { |
| int type; |
| |
| return isatty(fd) && ioctl(fd, KDGKBTYPE, &type) == 0 && |
| (type == KB_101 || type == KB_84); |
| } |
| |
| /* Prevent keystrokes from reaching the tty */ |
| static int SDL_EVDEV_mute_keyboard(int tty_fd, int* old_kb_mode) |
| { |
| if (!SDL_EVDEV_is_console(tty_fd)) { |
| return SDL_SetError("Tried to mute an invalid tty"); |
| } |
| |
| if (ioctl(tty_fd, KDGKBMODE, old_kb_mode) < 0) { |
| return SDL_SetError("Failed to get keyboard mode during muting"); |
| } |
| |
| /* FIXME: atm this absolutely ruins the vt, and KDSKBMUTE isn't implemented |
| in the kernel */ |
| /* |
| if (ioctl(tty_fd, KDSKBMODE, K_OFF) < 0) { |
| return SDL_SetError("Failed to set keyboard mode during muting"); |
| } |
| */ |
| |
| return 0; |
| } |
| |
| /* Restore the keyboard mode for given tty */ |
| static void SDL_EVDEV_unmute_keyboard(int tty_fd, int kb_mode) |
| { |
| /* read above */ |
| /* |
| if (ioctl(tty_fd, KDSKBMODE, kb_mode) < 0) { |
| SDL_Log("Failed to unmute keyboard"); |
| } |
| */ |
| } |
| |
| static int SDL_EVDEV_get_active_tty() |
| { |
| int i, fd, ret, tty = 0; |
| char tiocl; |
| struct vt_stat vt_state; |
| char path[PATH_MAX + 1]; |
| |
| for(i = 0; i < SDL_arraysize(EVDEV_consoles); i++) { |
| fd = open(EVDEV_consoles[i], O_RDONLY); |
| |
| if (fd < 0 && !SDL_EVDEV_is_console(fd)) |
| break; |
| |
| tiocl = TIOCL_GETFGCONSOLE; |
| if ((ret = ioctl(fd, TIOCLINUX, &tiocl)) >= 0) |
| tty = ret + 1; |
| else if (ioctl(fd, VT_GETSTATE, &vt_state) == 0) |
| tty = vt_state.v_active; |
| |
| close(fd); |
| |
| if (tty) { |
| sprintf(path, "/dev/tty%u", tty); |
| fd = open(path, O_RDONLY); |
| if (fd >= 0 && SDL_EVDEV_is_console(fd)) |
| return fd; |
| } |
| } |
| |
| return SDL_SetError("Failed to determine active tty"); |
| } |
| |
| int |
| SDL_EVDEV_Init(void) |
| { |
| if (_this == NULL) { |
| _this = (SDL_EVDEV_PrivateData*)SDL_calloc(1, sizeof(*_this)); |
| if (_this == NULL) { |
| return SDL_OutOfMemory(); |
| } |
| |
| #if SDL_USE_LIBUDEV |
| if (SDL_UDEV_Init() < 0) { |
| SDL_free(_this); |
| _this = NULL; |
| return -1; |
| } |
| |
| /* Set up the udev callback */ |
| if (SDL_UDEV_AddCallback(SDL_EVDEV_udev_callback) < 0) { |
| 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_active_tty(); |
| |
| /* Mute the keyboard so keystrokes only generate evdev events and do not |
| leak through to the console */ |
| SDL_EVDEV_mute_keyboard(_this->console_fd, &_this->kb_mode); |
| } |
| |
| _this->ref_count += 1; |
| |
| return 0; |
| } |
| |
| void |
| SDL_EVDEV_Quit(void) |
| { |
| 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) { |
| SDL_EVDEV_unmute_keyboard(_this->console_fd, _this->kb_mode); |
| close(_this->console_fd); |
| } |
| |
| /* 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->num_devices == 0); |
| |
| SDL_free(_this); |
| _this = NULL; |
| } |
| } |
| |
| #if SDL_USE_LIBUDEV |
| void SDL_EVDEV_udev_callback(SDL_UDEV_deviceevent udev_event, int udev_class, |
| const char* dev_path) |
| { |
| if (dev_path == NULL) { |
| return; |
| } |
| |
| switch(udev_event) { |
| case SDL_UDEV_DEVICEADDED: |
| if (!(udev_class & (SDL_UDEV_DEVICE_MOUSE | SDL_UDEV_DEVICE_KEYBOARD | |
| SDL_UDEV_DEVICE_TOUCHSCREEN))) |
| return; |
| |
| SDL_EVDEV_device_added(dev_path, udev_class); |
| break; |
| case SDL_UDEV_DEVICEREMOVED: |
| SDL_EVDEV_device_removed(dev_path); |
| break; |
| default: |
| break; |
| } |
| } |
| #endif /* SDL_USE_LIBUDEV */ |
| |
| #ifdef SDL_INPUT_LINUXKD |
| /* this logic is pulled from kbd_keycode() in drivers/tty/vt/keyboard.c in the |
| Linux kernel source */ |
| static void SDL_EVDEV_do_text_input(unsigned short keycode) { |
| char shift_state; |
| int locks_state; |
| struct kbentry kbe; |
| unsigned char type; |
| char text[2] = { 0 }; |
| |
| if (_this->console_fd < 0) |
| return; |
| |
| shift_state = TIOCL_GETSHIFTSTATE; |
| if (ioctl(_this->console_fd, TIOCLINUX, &shift_state) < 0) { |
| /* TODO: error */ |
| return; |
| } |
| |
| kbe.kb_table = shift_state; |
| kbe.kb_index = keycode; |
| |
| if (ioctl(_this->console_fd, KDGKBENT, &kbe) < 0) { |
| /* TODO: error */ |
| return; |
| } |
| |
| type = KTYP(kbe.kb_value); |
| |
| if (type < 0xf0) { |
| /* |
| * FIXME: keysyms with a type below 0xf0 represent a unicode character |
| * which requires special handling due to dead characters, diacritics, |
| * etc. For perfect input a proper way to deal with such characters |
| * should be implemented. |
| * |
| * For reference, the only place I was able to find out about this |
| * special 0xf0 value was in an unused? couple of patches listed below. |
| * |
| * http://ftp.tc.edu.tw/pub/docs/Unicode/utf8/linux-2.3.12-keyboard.diff |
| * http://ftp.tc.edu.tw/pub/docs/Unicode/utf8/linux-2.3.12-console.diff |
| */ |
| |
| return; |
| } |
| |
| type -= 0xf0; |
| |
| /* if type is KT_LETTER then it can be affected by Caps Lock */ |
| if (type == KT_LETTER) { |
| type = KT_LATIN; |
| |
| if (ioctl(_this->console_fd, KDGKBLED, &locks_state) < 0) { |
| /* TODO: error */ |
| return; |
| } |
| |
| if (locks_state & K_CAPSLOCK) { |
| kbe.kb_table = shift_state ^ (1 << KG_SHIFT); |
| |
| if (ioctl(_this->console_fd, KDGKBENT, &kbe) < 0) { |
| /* TODO: error */ |
| return; |
| } |
| } |
| } |
| |
| /* TODO: convert values >= 0x80 from ISO-8859-1? to UTF-8 */ |
| if (type != KT_LATIN || KVAL(kbe.kb_value) >= 0x80) |
| return; |
| |
| *text = KVAL(kbe.kb_value); |
| SDL_SendKeyboardText(text); |
| } |
| #endif /* SDL_INPUT_LINUXKD */ |
| |
| void |
| SDL_EVDEV_Poll(void) |
| { |
| struct input_event events[32]; |
| int i, j, len; |
| SDL_evdevlist_item *item; |
| SDL_Scancode scan_code; |
| int mouse_button; |
| SDL_Mouse *mouse; |
| float norm_x, norm_y; |
| |
| 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) { |
| /* 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)) { |
| 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); |
| } else if (events[i].value == 1 || events[i].value == 2 /* key repeated */) { |
| SDL_SendKeyboardKey(SDL_PRESSED, scan_code); |
| #ifdef SDL_INPUT_LINUXKD |
| SDL_EVDEV_do_text_input(events[i].code); |
| #endif /* SDL_INPUT_LINUXKD */ |
| } |
| } |
| 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_X: |
| if (item->is_touchscreen) /* FIXME: temp hack */ |
| break; |
| SDL_SendMouseMotion(mouse->focus, mouse->mouseID, SDL_FALSE, events[i].value, mouse->y); |
| break; |
| case ABS_Y: |
| if (item->is_touchscreen) /* FIXME: temp hack */ |
| break; |
| 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) { |
| 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; |
| |
| switch(item->touchscreen_data->slots[j].delta) { |
| case EVDEV_TOUCH_SLOTDELTA_DOWN: |
| SDL_SendTouch(item->fd, item->touchscreen_data->slots[j].tracking_id, SDL_TRUE, norm_x, norm_y, 1.0f); |
| 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, SDL_FALSE, norm_x, norm_y, 1.0f); |
| 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, norm_x, norm_y, 1.0f); |
| 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: |
| break; |
| } |
| break; |
| } |
| } |
| } |
| } |
| } |
| |
| static SDL_Scancode |
| SDL_EVDEV_translate_keycode(int keycode) |
| { |
| SDL_Scancode scancode = SDL_SCANCODE_UNKNOWN; |
| |
| if (keycode < SDL_arraysize(linux_scancode_table)) |
| scancode = linux_scancode_table[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; |
| 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_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"); |
| } |
| 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, 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"); |
| } |
| 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_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"); |
| } |
| item->touchscreen_data->max_slots = abs_info.maximum + 1; |
| |
| 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 */ |
| 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) |
| { |
| #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 |
| */ |
| __u32* mt_req_code; |
| __s32* 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 = (__s32*)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; |
| } |
| } |
| } |
| |
| 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 *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(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(dev_path, O_RDONLY | O_NONBLOCK); |
| if (item->fd < 0) { |
| SDL_free(item); |
| return SDL_SetError("Unable to open %s", dev_path); |
| } |
| |
| item->path = SDL_strdup(dev_path); |
| if (item->path == NULL) { |
| close(item->fd); |
| SDL_free(item); |
| return SDL_OutOfMemory(); |
| } |
| |
| 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->num_devices++; |
| } |
| #endif /* SDL_USE_LIBUDEV */ |
| |
| static int |
| 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(dev_path, item->path) == 0) { |
| if (prev != NULL) { |
| prev->next = item->next; |
| } else { |
| SDL_assert(_this->first == item); |
| _this->first = item->next; |
| } |
| 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->num_devices--; |
| return 0; |
| } |
| prev = item; |
| } |
| |
| return -1; |
| } |
| |
| |
| #endif /* SDL_INPUT_LINUXEV */ |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |
