mirror of
https://github.com/libretro/RetroArch.git
synced 2024-11-24 00:20:01 +00:00
151 lines
3.5 KiB
C
151 lines
3.5 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 <sys/types.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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};
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static struct linuxraw_joypad g_pads[MAX_PLAYERS];
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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 void linuxraw_joypad_poll(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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struct linuxraw_joypad *pad = &g_pads[i];
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if (pad->fd < 0)
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continue;
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poll_pad(pad);
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}
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}
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static bool linuxraw_joypad_init(void)
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{
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bool has_pad = 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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char path[PATH_MAX];
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snprintf(path, sizeof(path), "/dev/input/js%u", i);
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pad->fd = open(path, O_RDONLY | O_NONBLOCK);
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has_pad |= pad->fd >= 0;
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}
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// Get initial state.
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if (has_pad)
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linuxraw_joypad_poll();
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return has_pad;
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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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}
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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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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",
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};
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