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Diffstat (limited to '3rdparty/SDL2/src/core/linux/SDL_udev.c')
-rw-r--r--3rdparty/SDL2/src/core/linux/SDL_udev.c532
1 files changed, 532 insertions, 0 deletions
diff --git a/3rdparty/SDL2/src/core/linux/SDL_udev.c b/3rdparty/SDL2/src/core/linux/SDL_udev.c
new file mode 100644
index 00000000000..099cc435e27
--- /dev/null
+++ b/3rdparty/SDL2/src/core/linux/SDL_udev.c
@@ -0,0 +1,532 @@
+/*
+ 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.
+*/
+
+/*
+ * To list the properties of a device, try something like:
+ * udevadm info -a -n snd/hwC0D0 (for a sound card)
+ * udevadm info --query=all -n input/event3 (for a keyboard, mouse, etc)
+ * udevadm info --query=property -n input/event2
+ */
+#include "SDL_udev.h"
+
+#ifdef SDL_USE_LIBUDEV
+
+#include <linux/input.h>
+
+#include "SDL.h"
+
+static const char* SDL_UDEV_LIBS[] = { "libudev.so.1", "libudev.so.0" };
+
+#define _THIS SDL_UDEV_PrivateData *_this
+static _THIS = NULL;
+
+static SDL_bool SDL_UDEV_load_sym(const char *fn, void **addr);
+static int SDL_UDEV_load_syms(void);
+static SDL_bool SDL_UDEV_hotplug_update_available(void);
+static void device_event(SDL_UDEV_deviceevent type, struct udev_device *dev);
+
+static SDL_bool
+SDL_UDEV_load_sym(const char *fn, void **addr)
+{
+ *addr = SDL_LoadFunction(_this->udev_handle, fn);
+ if (*addr == NULL) {
+ /* Don't call SDL_SetError(): SDL_LoadFunction already did. */
+ return SDL_FALSE;
+ }
+
+ return SDL_TRUE;
+}
+
+static int
+SDL_UDEV_load_syms(void)
+{
+ /* cast funcs to char* first, to please GCC's strict aliasing rules. */
+ #define SDL_UDEV_SYM(x) \
+ if (!SDL_UDEV_load_sym(#x, (void **) (char *) & _this->x)) return -1
+
+ SDL_UDEV_SYM(udev_device_get_action);
+ SDL_UDEV_SYM(udev_device_get_devnode);
+ SDL_UDEV_SYM(udev_device_get_subsystem);
+ SDL_UDEV_SYM(udev_device_get_parent_with_subsystem_devtype);
+ SDL_UDEV_SYM(udev_device_get_property_value);
+ SDL_UDEV_SYM(udev_device_get_sysattr_value);
+ SDL_UDEV_SYM(udev_device_new_from_syspath);
+ SDL_UDEV_SYM(udev_device_unref);
+ SDL_UDEV_SYM(udev_enumerate_add_match_property);
+ SDL_UDEV_SYM(udev_enumerate_add_match_subsystem);
+ SDL_UDEV_SYM(udev_enumerate_get_list_entry);
+ SDL_UDEV_SYM(udev_enumerate_new);
+ SDL_UDEV_SYM(udev_enumerate_scan_devices);
+ SDL_UDEV_SYM(udev_enumerate_unref);
+ SDL_UDEV_SYM(udev_list_entry_get_name);
+ SDL_UDEV_SYM(udev_list_entry_get_next);
+ SDL_UDEV_SYM(udev_monitor_enable_receiving);
+ SDL_UDEV_SYM(udev_monitor_filter_add_match_subsystem_devtype);
+ SDL_UDEV_SYM(udev_monitor_get_fd);
+ SDL_UDEV_SYM(udev_monitor_new_from_netlink);
+ SDL_UDEV_SYM(udev_monitor_receive_device);
+ SDL_UDEV_SYM(udev_monitor_unref);
+ SDL_UDEV_SYM(udev_new);
+ SDL_UDEV_SYM(udev_unref);
+ SDL_UDEV_SYM(udev_device_new_from_devnum);
+ SDL_UDEV_SYM(udev_device_get_devnum);
+ #undef SDL_UDEV_SYM
+
+ return 0;
+}
+
+static SDL_bool
+SDL_UDEV_hotplug_update_available(void)
+{
+ if (_this->udev_mon != NULL) {
+ const int fd = _this->udev_monitor_get_fd(_this->udev_mon);
+ fd_set fds;
+ struct timeval tv;
+
+ FD_ZERO(&fds);
+ FD_SET(fd, &fds);
+ tv.tv_sec = 0;
+ tv.tv_usec = 0;
+ if ((select(fd+1, &fds, NULL, NULL, &tv) > 0) && (FD_ISSET(fd, &fds))) {
+ return SDL_TRUE;
+ }
+ }
+ return SDL_FALSE;
+}
+
+
+int
+SDL_UDEV_Init(void)
+{
+ int retval = 0;
+
+ if (_this == NULL) {
+ _this = (SDL_UDEV_PrivateData *) SDL_calloc(1, sizeof(*_this));
+ if(_this == NULL) {
+ return SDL_OutOfMemory();
+ }
+
+ retval = SDL_UDEV_LoadLibrary();
+ if (retval < 0) {
+ SDL_UDEV_Quit();
+ return retval;
+ }
+
+ /* Set up udev monitoring
+ * Listen for input devices (mouse, keyboard, joystick, etc) and sound devices
+ */
+
+ _this->udev = _this->udev_new();
+ if (_this->udev == NULL) {
+ SDL_UDEV_Quit();
+ return SDL_SetError("udev_new() failed");
+ }
+
+ _this->udev_mon = _this->udev_monitor_new_from_netlink(_this->udev, "udev");
+ if (_this->udev_mon == NULL) {
+ SDL_UDEV_Quit();
+ return SDL_SetError("udev_monitor_new_from_netlink() failed");
+ }
+
+ _this->udev_monitor_filter_add_match_subsystem_devtype(_this->udev_mon, "input", NULL);
+ _this->udev_monitor_filter_add_match_subsystem_devtype(_this->udev_mon, "sound", NULL);
+ _this->udev_monitor_enable_receiving(_this->udev_mon);
+
+ /* Do an initial scan of existing devices */
+ SDL_UDEV_Scan();
+
+ }
+
+ _this->ref_count += 1;
+
+ return retval;
+}
+
+void
+SDL_UDEV_Quit(void)
+{
+ SDL_UDEV_CallbackList *item;
+
+ if (_this == NULL) {
+ return;
+ }
+
+ _this->ref_count -= 1;
+
+ if (_this->ref_count < 1) {
+
+ if (_this->udev_mon != NULL) {
+ _this->udev_monitor_unref(_this->udev_mon);
+ _this->udev_mon = NULL;
+ }
+ if (_this->udev != NULL) {
+ _this->udev_unref(_this->udev);
+ _this->udev = NULL;
+ }
+
+ /* Remove existing devices */
+ while (_this->first != NULL) {
+ item = _this->first;
+ _this->first = _this->first->next;
+ SDL_free(item);
+ }
+
+ SDL_UDEV_UnloadLibrary();
+ SDL_free(_this);
+ _this = NULL;
+ }
+}
+
+void
+SDL_UDEV_Scan(void)
+{
+ struct udev_enumerate *enumerate = NULL;
+ struct udev_list_entry *devs = NULL;
+ struct udev_list_entry *item = NULL;
+
+ if (_this == NULL) {
+ return;
+ }
+
+ enumerate = _this->udev_enumerate_new(_this->udev);
+ if (enumerate == NULL) {
+ SDL_UDEV_Quit();
+ SDL_SetError("udev_monitor_new_from_netlink() failed");
+ return;
+ }
+
+ _this->udev_enumerate_add_match_subsystem(enumerate, "input");
+ _this->udev_enumerate_add_match_subsystem(enumerate, "sound");
+
+ _this->udev_enumerate_scan_devices(enumerate);
+ devs = _this->udev_enumerate_get_list_entry(enumerate);
+ for (item = devs; item; item = _this->udev_list_entry_get_next(item)) {
+ const char *path = _this->udev_list_entry_get_name(item);
+ struct udev_device *dev = _this->udev_device_new_from_syspath(_this->udev, path);
+ if (dev != NULL) {
+ device_event(SDL_UDEV_DEVICEADDED, dev);
+ _this->udev_device_unref(dev);
+ }
+ }
+
+ _this->udev_enumerate_unref(enumerate);
+}
+
+
+void
+SDL_UDEV_UnloadLibrary(void)
+{
+ if (_this == NULL) {
+ return;
+ }
+
+ if (_this->udev_handle != NULL) {
+ SDL_UnloadObject(_this->udev_handle);
+ _this->udev_handle = NULL;
+ }
+}
+
+int
+SDL_UDEV_LoadLibrary(void)
+{
+ int retval = 0, i;
+
+ if (_this == NULL) {
+ return SDL_SetError("UDEV not initialized");
+ }
+
+
+ if (_this->udev_handle == NULL) {
+ for( i = 0 ; i < SDL_arraysize(SDL_UDEV_LIBS); i++) {
+ _this->udev_handle = SDL_LoadObject(SDL_UDEV_LIBS[i]);
+ if (_this->udev_handle != NULL) {
+ retval = SDL_UDEV_load_syms();
+ if (retval < 0) {
+ SDL_UDEV_UnloadLibrary();
+ }
+ else {
+ break;
+ }
+ }
+ }
+
+ if (_this->udev_handle == NULL) {
+ retval = -1;
+ /* Don't call SDL_SetError(): SDL_LoadObject already did. */
+ }
+ }
+
+ return retval;
+}
+
+#define BITS_PER_LONG (sizeof(unsigned long) * 8)
+#define NBITS(x) ((((x)-1)/BITS_PER_LONG)+1)
+#define OFF(x) ((x)%BITS_PER_LONG)
+#define BIT(x) (1UL<<OFF(x))
+#define LONG(x) ((x)/BITS_PER_LONG)
+#define test_bit(bit, array) ((array[LONG(bit)] >> OFF(bit)) & 1)
+
+static void get_caps(struct udev_device *dev, struct udev_device *pdev, const char *attr, unsigned long *bitmask, size_t bitmask_len)
+{
+ const char *value;
+ char text[4096];
+ char *word;
+ int i;
+ unsigned long v;
+
+ SDL_memset(bitmask, 0, bitmask_len*sizeof(*bitmask));
+ value = _this->udev_device_get_sysattr_value(pdev, attr);
+ if (!value) {
+ return;
+ }
+
+ SDL_strlcpy(text, value, sizeof(text));
+ i = 0;
+ while ((word = SDL_strrchr(text, ' ')) != NULL) {
+ v = SDL_strtoul(word+1, NULL, 16);
+ if (i < bitmask_len) {
+ bitmask[i] = v;
+ }
+ ++i;
+ *word = '\0';
+ }
+ v = SDL_strtoul(text, NULL, 16);
+ if (i < bitmask_len) {
+ bitmask[i] = v;
+ }
+}
+
+static int
+guess_device_class(struct udev_device *dev)
+{
+ int devclass = 0;
+ struct udev_device *pdev;
+ unsigned long bitmask_ev[NBITS(EV_MAX)];
+ unsigned long bitmask_abs[NBITS(ABS_MAX)];
+ unsigned long bitmask_key[NBITS(KEY_MAX)];
+ unsigned long bitmask_rel[NBITS(REL_MAX)];
+ unsigned long keyboard_mask;
+
+ /* walk up the parental chain until we find the real input device; the
+ * argument is very likely a subdevice of this, like eventN */
+ pdev = dev;
+ while (pdev && !_this->udev_device_get_sysattr_value(pdev, "capabilities/ev")) {
+ pdev = _this->udev_device_get_parent_with_subsystem_devtype(pdev, "input", NULL);
+ }
+ if (!pdev) {
+ return 0;
+ }
+
+ get_caps(dev, pdev, "capabilities/ev", bitmask_ev, SDL_arraysize(bitmask_ev));
+ get_caps(dev, pdev, "capabilities/abs", bitmask_abs, SDL_arraysize(bitmask_abs));
+ get_caps(dev, pdev, "capabilities/rel", bitmask_rel, SDL_arraysize(bitmask_rel));
+ get_caps(dev, pdev, "capabilities/key", bitmask_key, SDL_arraysize(bitmask_key));
+
+ if (test_bit(EV_ABS, bitmask_ev) &&
+ test_bit(ABS_X, bitmask_abs) && test_bit(ABS_Y, bitmask_abs)) {
+ if (test_bit(BTN_STYLUS, bitmask_key) || test_bit(BTN_TOOL_PEN, bitmask_key)) {
+ ; /* ID_INPUT_TABLET */
+ } else if (test_bit(BTN_TOOL_FINGER, bitmask_key) && !test_bit(BTN_TOOL_PEN, bitmask_key)) {
+ ; /* ID_INPUT_TOUCHPAD */
+ } else if (test_bit(BTN_MOUSE, bitmask_key)) {
+ devclass |= SDL_UDEV_DEVICE_MOUSE; /* ID_INPUT_MOUSE */
+ } else if (test_bit(BTN_TOUCH, bitmask_key)) {
+ ; /* ID_INPUT_TOUCHSCREEN */
+ }
+
+ if (test_bit(BTN_TRIGGER, bitmask_key) ||
+ test_bit(BTN_A, bitmask_key) ||
+ test_bit(BTN_1, bitmask_key) ||
+ test_bit(ABS_RX, bitmask_abs) ||
+ test_bit(ABS_RY, bitmask_abs) ||
+ test_bit(ABS_RZ, bitmask_abs) ||
+ test_bit(ABS_THROTTLE, bitmask_abs) ||
+ test_bit(ABS_RUDDER, bitmask_abs) ||
+ test_bit(ABS_WHEEL, bitmask_abs) ||
+ test_bit(ABS_GAS, bitmask_abs) ||
+ test_bit(ABS_BRAKE, bitmask_abs)) {
+ devclass |= SDL_UDEV_DEVICE_JOYSTICK; /* ID_INPUT_JOYSTICK */
+ }
+ }
+
+ if (test_bit(EV_REL, bitmask_ev) &&
+ test_bit(REL_X, bitmask_rel) && test_bit(REL_Y, bitmask_rel) &&
+ test_bit(BTN_MOUSE, bitmask_key)) {
+ devclass |= SDL_UDEV_DEVICE_MOUSE; /* ID_INPUT_MOUSE */
+ }
+
+ /* the first 32 bits are ESC, numbers, and Q to D; if we have any of
+ * those, consider it a keyboard device; do not test KEY_RESERVED, though */
+ keyboard_mask = 0xFFFFFFFE;
+ if ((bitmask_key[0] & keyboard_mask) != 0)
+ devclass |= SDL_UDEV_DEVICE_KEYBOARD; /* ID_INPUT_KEYBOARD */
+
+ return devclass;
+}
+
+static void
+device_event(SDL_UDEV_deviceevent type, struct udev_device *dev)
+{
+ const char *subsystem;
+ const char *val = NULL;
+ int devclass = 0;
+ const char *path;
+ SDL_UDEV_CallbackList *item;
+
+ path = _this->udev_device_get_devnode(dev);
+ if (path == NULL) {
+ return;
+ }
+
+ subsystem = _this->udev_device_get_subsystem(dev);
+ if (SDL_strcmp(subsystem, "sound") == 0) {
+ devclass = SDL_UDEV_DEVICE_SOUND;
+ } else if (SDL_strcmp(subsystem, "input") == 0) {
+ /* udev rules reference: http://cgit.freedesktop.org/systemd/systemd/tree/src/udev/udev-builtin-input_id.c */
+
+ val = _this->udev_device_get_property_value(dev, "ID_INPUT_JOYSTICK");
+ if (val != NULL && SDL_strcmp(val, "1") == 0 ) {
+ devclass |= SDL_UDEV_DEVICE_JOYSTICK;
+ }
+
+ val = _this->udev_device_get_property_value(dev, "ID_INPUT_MOUSE");
+ if (val != NULL && SDL_strcmp(val, "1") == 0 ) {
+ devclass |= SDL_UDEV_DEVICE_MOUSE;
+ }
+
+ /* The undocumented rule is:
+ - All devices with keys get ID_INPUT_KEY
+ - From this subset, if they have ESC, numbers, and Q to D, it also gets ID_INPUT_KEYBOARD
+
+ Ref: http://cgit.freedesktop.org/systemd/systemd/tree/src/udev/udev-builtin-input_id.c#n183
+ */
+ val = _this->udev_device_get_property_value(dev, "ID_INPUT_KEY");
+ if (val != NULL && SDL_strcmp(val, "1") == 0 ) {
+ devclass |= SDL_UDEV_DEVICE_KEYBOARD;
+ }
+
+ if (devclass == 0) {
+ /* Fall back to old style input classes */
+ val = _this->udev_device_get_property_value(dev, "ID_CLASS");
+ if (val != NULL) {
+ if (SDL_strcmp(val, "joystick") == 0) {
+ devclass = SDL_UDEV_DEVICE_JOYSTICK;
+ } else if (SDL_strcmp(val, "mouse") == 0) {
+ devclass = SDL_UDEV_DEVICE_MOUSE;
+ } else if (SDL_strcmp(val, "kbd") == 0) {
+ devclass = SDL_UDEV_DEVICE_KEYBOARD;
+ } else {
+ return;
+ }
+ } else {
+ /* We could be linked with libudev on a system that doesn't have udev running */
+ devclass = guess_device_class(dev);
+ }
+ }
+ } else {
+ return;
+ }
+
+ /* Process callbacks */
+ for (item = _this->first; item != NULL; item = item->next) {
+ item->callback(type, devclass, path);
+ }
+}
+
+void
+SDL_UDEV_Poll(void)
+{
+ struct udev_device *dev = NULL;
+ const char *action = NULL;
+
+ if (_this == NULL) {
+ return;
+ }
+
+ while (SDL_UDEV_hotplug_update_available()) {
+ dev = _this->udev_monitor_receive_device(_this->udev_mon);
+ if (dev == NULL) {
+ break;
+ }
+ action = _this->udev_device_get_action(dev);
+
+ if (SDL_strcmp(action, "add") == 0) {
+ /* Wait for the device to finish initialization */
+ SDL_Delay(100);
+
+ device_event(SDL_UDEV_DEVICEADDED, dev);
+ } else if (SDL_strcmp(action, "remove") == 0) {
+ device_event(SDL_UDEV_DEVICEREMOVED, dev);
+ }
+
+ _this->udev_device_unref(dev);
+ }
+}
+
+int
+SDL_UDEV_AddCallback(SDL_UDEV_Callback cb)
+{
+ SDL_UDEV_CallbackList *item;
+ item = (SDL_UDEV_CallbackList *) SDL_calloc(1, sizeof (SDL_UDEV_CallbackList));
+ if (item == NULL) {
+ return SDL_OutOfMemory();
+ }
+
+ item->callback = cb;
+
+ if (_this->last == NULL) {
+ _this->first = _this->last = item;
+ } else {
+ _this->last->next = item;
+ _this->last = item;
+ }
+
+ return 1;
+}
+
+void
+SDL_UDEV_DelCallback(SDL_UDEV_Callback cb)
+{
+ SDL_UDEV_CallbackList *item;
+ SDL_UDEV_CallbackList *prev = NULL;
+
+ for (item = _this->first; item != NULL; item = item->next) {
+ /* found it, remove it. */
+ if (item->callback == cb) {
+ if (prev != NULL) {
+ prev->next = item->next;
+ } else {
+ SDL_assert(_this->first == item);
+ _this->first = item->next;
+ }
+ if (item == _this->last) {
+ _this->last = prev;
+ }
+ SDL_free(item);
+ return;
+ }
+ prev = item;
+ }
+
+}
+
+
+#endif /* SDL_USE_LIBUDEV */