mirror of https://github.com/encounter/SDL.git
Uses SDL_UDEV for Linux joystick hotplugging
This commit is contained in:
Gabriel Jacobo
parent
69a4351eb0
commit
57e09318dd
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@ -52,124 +52,13 @@
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#define SYN_DROPPED 3
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#endif
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/*
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* !!! FIXME: move all the udev stuff to src/core/linux, so I can reuse it
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* !!! FIXME: for audio hardware disconnects.
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*/
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#ifdef HAVE_LIBUDEV_H
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#define SDL_USE_LIBUDEV 1
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#include "SDL_loadso.h"
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#include <libudev.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include "../../core/linux/SDL_udev.h"
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/* we never link directly to libudev. */
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/* !!! FIXME: can we generalize this? ALSA, etc, do the same things. */
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static const char *udev_library = "libudev.so.0";
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static void *udev_handle = NULL;
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/* !!! FIXME: this is kinda ugly. */
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static SDL_bool
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load_udev_sym(const char *fn, void **addr)
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{
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*addr = SDL_LoadFunction(udev_handle, fn);
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if (*addr == NULL) {
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/* Don't call SDL_SetError(): SDL_LoadFunction already did. */
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return SDL_FALSE;
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}
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return SDL_TRUE;
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}
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/* libudev entry points... */
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static const char *(*UDEV_udev_device_get_action)(struct udev_device *) = NULL;
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static const char *(*UDEV_udev_device_get_devnode)(struct udev_device *) = NULL;
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static const char *(*UDEV_udev_device_get_property_value)(struct udev_device *, const char *) = NULL;
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static struct udev_device *(*UDEV_udev_device_new_from_syspath)(struct udev *, const char *) = NULL;
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static void (*UDEV_udev_device_unref)(struct udev_device *) = NULL;
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static int (*UDEV_udev_enumerate_add_match_property)(struct udev_enumerate *, const char *, const char *) = NULL;
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static int (*UDEV_udev_enumerate_add_match_subsystem)(struct udev_enumerate *, const char *) = NULL;
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static struct udev_list_entry *(*UDEV_udev_enumerate_get_list_entry)(struct udev_enumerate *) = NULL;
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static struct udev_enumerate *(*UDEV_udev_enumerate_new)(struct udev *) = NULL;
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static int (*UDEV_udev_enumerate_scan_devices)(struct udev_enumerate *) = NULL;
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static void (*UDEV_udev_enumerate_unref)(struct udev_enumerate *) = NULL;
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static const char *(*UDEV_udev_list_entry_get_name)(struct udev_list_entry *) = NULL;
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static struct udev_list_entry *(*UDEV_udev_list_entry_get_next)(struct udev_list_entry *) = NULL;
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static int (*UDEV_udev_monitor_enable_receiving)(struct udev_monitor *) = NULL;
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static int (*UDEV_udev_monitor_filter_add_match_subsystem_devtype)(struct udev_monitor *, const char *, const char *) = NULL;
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static int (*UDEV_udev_monitor_get_fd)(struct udev_monitor *) = NULL;
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static struct udev_monitor *(*UDEV_udev_monitor_new_from_netlink)(struct udev *, const char *) = NULL;
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static struct udev_device *(*UDEV_udev_monitor_receive_device)(struct udev_monitor *) = NULL;
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static void (*UDEV_udev_monitor_unref)(struct udev_monitor *) = NULL;
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static struct udev *(*UDEV_udev_new)(void) = NULL;
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static void (*UDEV_udev_unref)(struct udev *) = NULL;
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static int
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load_udev_syms(void)
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{
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/* cast funcs to char* first, to please GCC's strict aliasing rules. */
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#define SDL_UDEV_SYM(x) \
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if (!load_udev_sym(#x, (void **) (char *) &UDEV_##x)) return -1
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SDL_UDEV_SYM(udev_device_get_action);
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SDL_UDEV_SYM(udev_device_get_devnode);
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SDL_UDEV_SYM(udev_device_get_property_value);
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SDL_UDEV_SYM(udev_device_new_from_syspath);
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SDL_UDEV_SYM(udev_device_unref);
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SDL_UDEV_SYM(udev_enumerate_add_match_property);
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SDL_UDEV_SYM(udev_enumerate_add_match_subsystem);
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SDL_UDEV_SYM(udev_enumerate_get_list_entry);
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SDL_UDEV_SYM(udev_enumerate_new);
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SDL_UDEV_SYM(udev_enumerate_scan_devices);
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SDL_UDEV_SYM(udev_enumerate_unref);
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SDL_UDEV_SYM(udev_list_entry_get_name);
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SDL_UDEV_SYM(udev_list_entry_get_next);
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SDL_UDEV_SYM(udev_monitor_enable_receiving);
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SDL_UDEV_SYM(udev_monitor_filter_add_match_subsystem_devtype);
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SDL_UDEV_SYM(udev_monitor_get_fd);
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SDL_UDEV_SYM(udev_monitor_new_from_netlink);
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SDL_UDEV_SYM(udev_monitor_receive_device);
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SDL_UDEV_SYM(udev_monitor_unref);
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SDL_UDEV_SYM(udev_new);
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SDL_UDEV_SYM(udev_unref);
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#undef SDL_UDEV_SYM
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return 0;
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}
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static void
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UnloadUDEVLibrary(void)
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{
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if (udev_handle != NULL) {
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SDL_UnloadObject(udev_handle);
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udev_handle = NULL;
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}
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}
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static int
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LoadUDEVLibrary(void)
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{
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int retval = 0;
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if (udev_handle == NULL) {
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udev_handle = SDL_LoadObject(udev_library);
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if (udev_handle == NULL) {
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retval = -1;
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/* Don't call SDL_SetError(): SDL_LoadObject already did. */
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} else {
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retval = load_udev_syms();
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if (retval < 0) {
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UnloadUDEVLibrary();
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}
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}
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}
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return retval;
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}
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static struct udev *udev = NULL;
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static struct udev_monitor *udev_mon = NULL;
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#endif
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static int MaybeAddDevice(const char *path);
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#if SDL_USE_LIBUDEV
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static int MaybeRemoveDevice(const char *path);
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void joystick_udev_callback(SDL_UDEV_deviceevent udev_type, SDL_UDEV_deviceclass udev_class, const char *devpath);
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#endif /* SDL_USE_LIBUDEV */
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/* A linked list of available joysticks */
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@ -246,6 +135,62 @@ IsJoystick(int fd, char *namebuf, const size_t namebuflen, SDL_JoystickGUID *gui
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return 1;
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}
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#if SDL_USE_LIBUDEV
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void joystick_udev_callback(SDL_UDEV_deviceevent udev_type, SDL_UDEV_deviceclass udev_class, const char *devpath)
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{
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int instance;
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if (devpath == NULL || udev_class != SDL_UDEV_DEVICE_JOYSTICK) {
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return;
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}
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switch( udev_type )
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{
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case SDL_UDEV_DEVICEADDED:
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instance = MaybeAddDevice(devpath);
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if (instance != -1) {
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/* !!! FIXME: Move this to an SDL_PrivateJoyDeviceAdded() function? */
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#if !SDL_EVENTS_DISABLED
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SDL_Event event;
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event.type = SDL_JOYDEVICEADDED;
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if (SDL_GetEventState(event.type) == SDL_ENABLE) {
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event.jdevice.which = instance;
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if ( (SDL_EventOK == NULL) ||
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(*SDL_EventOK) (SDL_EventOKParam, &event) ) {
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SDL_PushEvent(&event);
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}
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}
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#endif /* !SDL_EVENTS_DISABLED */
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}
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break;
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case SDL_UDEV_DEVICEREMOVED:
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instance = MaybeRemoveDevice(devpath);
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if (instance != -1) {
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/* !!! FIXME: Move this to an SDL_PrivateJoyDeviceRemoved() function? */
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#if !SDL_EVENTS_DISABLED
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SDL_Event event;
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event.type = SDL_JOYDEVICEREMOVED;
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if (SDL_GetEventState(event.type) == SDL_ENABLE) {
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event.jdevice.which = instance;
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if ( (SDL_EventOK == NULL) ||
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(*SDL_EventOK) (SDL_EventOKParam, &event) ) {
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SDL_PushEvent(&event);
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}
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}
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#endif /* !SDL_EVENTS_DISABLED */
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}
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break;
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default:
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break;
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}
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}
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#endif /* SDL_USE_LIBUDEV */
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/* !!! FIXME: I would love to dump this code and use libudev instead. */
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static int
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@ -380,40 +325,19 @@ JoystickInitWithoutUdev(void)
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static int
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JoystickInitWithUdev(void)
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{
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struct udev_enumerate *enumerate = NULL;
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struct udev_list_entry *devs = NULL;
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struct udev_list_entry *item = NULL;
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SDL_assert(udev == NULL);
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udev = UDEV_udev_new();
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if (udev == NULL) {
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return SDL_SetError("udev_new() failed");
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if (SDL_UDEV_Init() < 0) {
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return SDL_SetError("Could not initialize UDEV");
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}
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udev_mon = UDEV_udev_monitor_new_from_netlink(udev, "udev");
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if (udev_mon != NULL) { /* okay if it's NULL, we just lose hotplugging. */
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UDEV_udev_monitor_filter_add_match_subsystem_devtype(udev_mon,
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"input", NULL);
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UDEV_udev_monitor_enable_receiving(udev_mon);
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/* Set up the udev callback */
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if ( SDL_UDEV_AddCallback(joystick_udev_callback) < 0) {
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SDL_UDEV_Quit();
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return SDL_SetError("Could not set up joystick <-> udev callback");
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}
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enumerate = UDEV_udev_enumerate_new(udev);
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if (enumerate == NULL) {
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return SDL_SetError("udev_enumerate_new() failed");
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}
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UDEV_udev_enumerate_add_match_subsystem(enumerate, "input");
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UDEV_udev_enumerate_add_match_property(enumerate, "ID_INPUT_JOYSTICK", "1");
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UDEV_udev_enumerate_scan_devices(enumerate);
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devs = UDEV_udev_enumerate_get_list_entry(enumerate);
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for (item = devs; item; item = UDEV_udev_list_entry_get_next(item)) {
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const char *path = UDEV_udev_list_entry_get_name(item);
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struct udev_device *dev = UDEV_udev_device_new_from_syspath(udev, path);
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MaybeAddDevice(UDEV_udev_device_get_devnode(dev));
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UDEV_udev_device_unref(dev);
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}
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UDEV_udev_enumerate_unref(enumerate);
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/* Force a scan to build the initial device list */
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SDL_UDEV_Scan();
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return numjoysticks;
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}
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@ -439,9 +363,7 @@ SDL_SYS_JoystickInit(void)
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}
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#if SDL_USE_LIBUDEV
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if (LoadUDEVLibrary() == 0) { /* okay if this fails, FOR NOW. */
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return JoystickInitWithUdev();
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}
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return JoystickInitWithUdev();
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#endif
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return JoystickInitWithoutUdev();
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@ -452,99 +374,21 @@ int SDL_SYS_NumJoysticks()
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return numjoysticks;
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}
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static SDL_bool
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HotplugUpdateAvailable(void)
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{
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#if SDL_USE_LIBUDEV
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if (udev_mon != NULL) {
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const int fd = UDEV_udev_monitor_get_fd(udev_mon);
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fd_set fds;
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struct timeval tv;
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FD_ZERO(&fds);
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FD_SET(fd, &fds);
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tv.tv_sec = 0;
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tv.tv_usec = 0;
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if ((select(fd+1, &fds, NULL, NULL, &tv) > 0) && (FD_ISSET(fd, &fds))) {
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return SDL_TRUE;
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}
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}
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#endif
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return SDL_FALSE;
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}
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void SDL_SYS_JoystickDetect()
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{
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#if SDL_USE_LIBUDEV
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struct udev_device *dev = NULL;
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const char *devnode = NULL;
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const char *action = NULL;
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const char *val = NULL;
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while (HotplugUpdateAvailable()) {
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dev = UDEV_udev_monitor_receive_device(udev_mon);
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if (dev == NULL) {
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break;
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}
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val = UDEV_udev_device_get_property_value(dev, "ID_INPUT_JOYSTICK");
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if ((!val) || (SDL_strcmp(val, "1") != 0)) {
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continue;
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}
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action = UDEV_udev_device_get_action(dev);
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devnode = UDEV_udev_device_get_devnode(dev);
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if (SDL_strcmp(action, "add") == 0) {
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const int device_index = MaybeAddDevice(devnode);
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if (device_index != -1) {
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/* !!! FIXME: Move this to an SDL_PrivateJoyDeviceAdded() function? */
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#if !SDL_EVENTS_DISABLED
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SDL_Event event;
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event.type = SDL_JOYDEVICEADDED;
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if (SDL_GetEventState(event.type) == SDL_ENABLE) {
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event.jdevice.which = device_index;
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if ( (SDL_EventOK == NULL) ||
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(*SDL_EventOK) (SDL_EventOKParam, &event) ) {
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SDL_PushEvent(&event);
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}
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}
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#endif /* !SDL_EVENTS_DISABLED */
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}
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} else if (SDL_strcmp(action, "remove") == 0) {
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const int inst = MaybeRemoveDevice(devnode);
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if (inst != -1) {
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/* !!! FIXME: Move this to an SDL_PrivateJoyDeviceRemoved() function? */
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#if !SDL_EVENTS_DISABLED
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SDL_Event event;
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event.type = SDL_JOYDEVICEREMOVED;
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if (SDL_GetEventState(event.type) == SDL_ENABLE) {
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event.jdevice.which = inst;
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if ( (SDL_EventOK == NULL) ||
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(*SDL_EventOK) (SDL_EventOKParam, &event) ) {
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SDL_PushEvent(&event);
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}
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}
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#endif /* !SDL_EVENTS_DISABLED */
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}
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}
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UDEV_udev_device_unref(dev);
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}
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SDL_UDEV_Poll();
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#endif
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}
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SDL_bool SDL_SYS_JoystickNeedsPolling()
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{
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/*
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* This results in a select() call, so technically we're polling to
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* decide if we should poll, but I think this function is here because
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* Windows has to do an enormous amount of work to detect new sticks,
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* whereas libudev just needs to see if there's more data available on
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* a socket...so this should be acceptable, I hope.
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*/
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return HotplugUpdateAvailable();
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#if SDL_USE_LIBUDEV
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return SDL_TRUE;
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#endif
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return SDL_FALSE;
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}
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static SDL_joylist_item *
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@ -1011,15 +855,8 @@ SDL_SYS_JoystickQuit(void)
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instance_counter = 0;
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#if SDL_USE_LIBUDEV
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if (udev_mon != NULL) {
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UDEV_udev_monitor_unref(udev_mon);
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udev_mon = NULL;
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}
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if (udev != NULL) {
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UDEV_udev_unref(udev);
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udev = NULL;
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}
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UnloadUDEVLibrary();
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SDL_UDEV_DelCallback(joystick_udev_callback);
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SDL_UDEV_Quit();
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#endif
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}
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