diff options
Diffstat (limited to 'source/3rd-party/SDL2/src/core/linux/SDL_evdev.c')
| -rw-r--r-- | source/3rd-party/SDL2/src/core/linux/SDL_evdev.c | 699 |
1 files changed, 699 insertions, 0 deletions
diff --git a/source/3rd-party/SDL2/src/core/linux/SDL_evdev.c b/source/3rd-party/SDL2/src/core/linux/SDL_evdev.c new file mode 100644 index 0000000..5443c21 --- /dev/null +++ b/source/3rd-party/SDL2/src/core/linux/SDL_evdev.c @@ -0,0 +1,699 @@ +/* + Simple DirectMedia Layer + Copyright (C) 1997-2018 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 "SDL_evdev_kbd.h" + +#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" +#include "../../events/scancodes_linux.h" /* adds linux_scancode_table */ +#include "../../core/linux/SDL_udev.h" + +/* 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 +#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 +{ + 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 *dev_path); + +#if SDL_USE_LIBUDEV +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 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) +{ + 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 */ + + _this->kbd = SDL_EVDEV_kbd_init(); + } + + _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 */ + + 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->num_devices == 0); + + SDL_free(_this); + _this = NULL; + } +} + +#if SDL_USE_LIBUDEV +static 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 */ + +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); + } + } + 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_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 forums/mailing list " + "<https://discourse.libsdl.org/> EVDEV KeyCode %d", 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: */ |