mirror of
https://github.com/libretro/RetroArch.git
synced 2024-12-04 22:46:46 +00:00
319 lines
8.1 KiB
C
319 lines
8.1 KiB
C
/* RetroArch - A frontend for libretro.
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* Copyright (C) 2010-2013 - Hans-Kristian Arntzen
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*
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* RetroArch is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with RetroArch.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "input_common.h"
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#include "../general.h"
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#include <unistd.h>
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#include <stdint.h>
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#include <string.h>
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#include <limits.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/inotify.h>
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#include <sys/epoll.h>
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#include <fcntl.h>
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#include <linux/joystick.h>
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#define NUM_BUTTONS 32
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#define NUM_AXES 32
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struct linuxraw_joypad
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{
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int fd;
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bool buttons[NUM_BUTTONS];
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int16_t axes[NUM_AXES];
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char *ident;
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};
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static struct linuxraw_joypad g_pads[MAX_PLAYERS];
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static int g_notify;
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static int g_epoll;
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static bool g_hotplug;
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static void poll_pad(struct linuxraw_joypad *pad)
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{
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struct js_event event;
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while (read(pad->fd, &event, sizeof(event)) == (ssize_t)sizeof(event))
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{
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unsigned type = event.type & ~JS_EVENT_INIT;
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switch (type)
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{
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case JS_EVENT_BUTTON:
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if (event.number < NUM_BUTTONS)
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pad->buttons[event.number] = event.value;
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break;
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case JS_EVENT_AXIS:
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if (event.number < NUM_AXES)
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pad->axes[event.number] = event.value;
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break;
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}
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}
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}
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static bool linuxraw_joypad_init_pad(const char *path, struct linuxraw_joypad *pad)
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{
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if (pad->fd >= 0)
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return false;
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// Device can have just been created, but not made accessible (yet).
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// IN_ATTRIB will signal when permissions change.
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if (access(path, R_OK) < 0)
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return false;
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pad->fd = open(path, O_RDONLY | O_NONBLOCK);
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*pad->ident = '\0';
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if (pad->fd >= 0)
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{
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if (ioctl(pad->fd, JSIOCGNAME(sizeof(g_settings.input.device_names[0])), pad->ident) >= 0)
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{
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RARCH_LOG("[Joypad]: Found pad: %s on %s.\n", pad->ident, path);
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if (g_hotplug)
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{
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char msg[512];
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snprintf(msg, sizeof(msg), "Joypad #%u (%s) connected.", (unsigned)(pad - g_pads), pad->ident);
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#ifndef IS_JOYCONFIG
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msg_queue_push(g_extern.msg_queue, msg, 0, 60);
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#endif
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}
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}
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else
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RARCH_ERR("[Joypad]: Didn't find ident of %s.\n", path);
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struct epoll_event event;
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event.events = EPOLLIN;
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event.data.ptr = pad;
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epoll_ctl(g_epoll, EPOLL_CTL_ADD, pad->fd, &event);
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return true;
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}
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else
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{
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RARCH_ERR("[Joypad]: Failed to open pad %s (error: %s).\n", path, strerror(errno));
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return false;
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}
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}
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static void handle_plugged_pad(void)
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{
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size_t event_size = sizeof(struct inotify_event) + NAME_MAX + 1;
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uint8_t *event_buf = (uint8_t*)calloc(1, event_size);
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if (!event_buf)
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return;
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int rc;
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while ((rc = read(g_notify, event_buf, event_size)) >= 0)
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{
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struct inotify_event *event = NULL;
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// Can read multiple events in one read() call.
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for (int i = 0; i < rc; i += event->len + sizeof(struct inotify_event))
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{
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event = (struct inotify_event*)&event_buf[i];
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if (strstr(event->name, "js") != event->name)
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continue;
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unsigned index = strtoul(event->name + 2, NULL, 0);
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if (index >= MAX_PLAYERS)
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continue;
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if (event->mask & IN_DELETE)
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{
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if (g_pads[index].fd >= 0)
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{
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if (g_hotplug)
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{
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char msg[512];
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snprintf(msg, sizeof(msg), "Joypad #%u (%s) disconnected.", index, g_pads[index].ident);
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#ifndef IS_JOYCONFIG
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msg_queue_push(g_extern.msg_queue, msg, 0, 60);
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#endif
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}
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RARCH_LOG("[Joypad]: Joypad %s disconnected.\n", g_pads[index].ident);
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close(g_pads[index].fd);
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memset(g_pads[index].buttons, 0, sizeof(g_pads[index].buttons));
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memset(g_pads[index].axes, 0, sizeof(g_pads[index].axes));
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g_pads[index].fd = -1;
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*g_pads[index].ident = '\0';
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input_config_autoconfigure_joypad(index, NULL, NULL);
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}
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}
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// Sometimes, device will be created before acess to it is established.
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else if (event->mask & (IN_CREATE | IN_ATTRIB))
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{
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char path[PATH_MAX];
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snprintf(path, sizeof(path), "/dev/input/%s", event->name);
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bool ret = linuxraw_joypad_init_pad(path, &g_pads[index]);
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if (*g_pads[index].ident && ret)
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input_config_autoconfigure_joypad(index, g_pads[index].ident, "linuxraw");
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}
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}
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}
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free(event_buf);
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}
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static void linuxraw_joypad_poll(void)
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{
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int ret;
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struct epoll_event events[MAX_PLAYERS + 1];
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retry:
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ret = epoll_wait(g_epoll, events, MAX_PLAYERS + 1, 0);
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if (ret < 0 && errno == EINTR)
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goto retry;
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for (int i = 0; i < ret; i++)
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{
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if (events[i].data.ptr)
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poll_pad((struct linuxraw_joypad*)events[i].data.ptr);
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else
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handle_plugged_pad();
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}
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}
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static void linuxraw_joypad_setup_notify(void)
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{
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fcntl(g_notify, F_SETFL, fcntl(g_notify, F_GETFL) | O_NONBLOCK);
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inotify_add_watch(g_notify, "/dev/input", IN_DELETE | IN_CREATE | IN_ATTRIB);
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}
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static bool linuxraw_joypad_init(void)
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{
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g_epoll = epoll_create(MAX_PLAYERS + 1);
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if (g_epoll < 0)
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return false;
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for (unsigned i = 0; i < MAX_PLAYERS; i++)
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{
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struct linuxraw_joypad *pad = &g_pads[i];
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pad->fd = -1;
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pad->ident = g_settings.input.device_names[i];
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char path[PATH_MAX];
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snprintf(path, sizeof(path), "/dev/input/js%u", i);
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if (linuxraw_joypad_init_pad(path, pad))
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{
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input_config_autoconfigure_joypad(i, pad->ident, "linuxraw");
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poll_pad(pad);
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}
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else
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input_config_autoconfigure_joypad(i, NULL, NULL);
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}
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g_notify = inotify_init();
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if (g_notify >= 0)
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{
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linuxraw_joypad_setup_notify();
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struct epoll_event event;
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event.events = EPOLLIN;
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event.data.ptr = NULL;
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epoll_ctl(g_epoll, EPOLL_CTL_ADD, g_notify, &event);
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}
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g_hotplug = true;
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return true;
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}
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static void linuxraw_joypad_destroy(void)
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{
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for (unsigned i = 0; i < MAX_PLAYERS; i++)
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{
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if (g_pads[i].fd >= 0)
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close(g_pads[i].fd);
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}
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memset(g_pads, 0, sizeof(g_pads));
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for (unsigned i = 0; i < MAX_PLAYERS; i++)
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g_pads[i].fd = -1;
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if (g_notify >= 0)
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close(g_notify);
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g_notify = -1;
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if (g_epoll >= 0)
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close(g_epoll);
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g_epoll = -1;
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g_hotplug = false;
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}
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static bool linuxraw_joypad_button(unsigned port, uint16_t joykey)
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{
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const struct linuxraw_joypad *pad = &g_pads[port];
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return joykey < NUM_BUTTONS && pad->buttons[joykey];
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}
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static int16_t linuxraw_joypad_axis(unsigned port, uint32_t joyaxis)
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{
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if (joyaxis == AXIS_NONE)
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return 0;
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const struct linuxraw_joypad *pad = &g_pads[port];
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int16_t val = 0;
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if (AXIS_NEG_GET(joyaxis) < NUM_AXES)
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{
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val = pad->axes[AXIS_NEG_GET(joyaxis)];
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if (val > 0)
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val = 0;
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// Kernel returns values in range [-0x7fff, 0x7fff].
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}
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else if (AXIS_POS_GET(joyaxis) < NUM_AXES)
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{
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val = pad->axes[AXIS_POS_GET(joyaxis)];
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if (val < 0)
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val = 0;
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}
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return val;
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}
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static bool linuxraw_joypad_query_pad(unsigned pad)
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{
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return pad < MAX_PLAYERS && g_pads[pad].fd >= 0;
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}
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static const char *linuxraw_joypad_name(unsigned pad)
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{
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if (pad >= MAX_PLAYERS)
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return NULL;
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return *g_pads[pad].ident ? g_pads[pad].ident : NULL;
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}
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const rarch_joypad_driver_t linuxraw_joypad = {
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linuxraw_joypad_init,
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linuxraw_joypad_query_pad,
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linuxraw_joypad_destroy,
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linuxraw_joypad_button,
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linuxraw_joypad_axis,
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linuxraw_joypad_poll,
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linuxraw_joypad_name,
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"linuxraw",
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};
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