mirror of
https://github.com/libretro/RetroArch
synced 2024-12-29 12:31:05 +00:00
588 lines
15 KiB
C
588 lines
15 KiB
C
/* RetroArch - A frontend for libretro.
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* Copyright (C) 2010-2014 - 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/stat.h>
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#include <sys/poll.h>
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#include <fcntl.h>
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#include <libudev.h>
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#include <linux/types.h>
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#include <linux/input.h>
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// Udev/evdev Linux joypad driver.
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// More complex and extremely low level,
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// but only Linux driver which can support joypad rumble.
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// Uses udev for device detection + hotplug.
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//
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// Code adapted from SDL 2.0's implementation.
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#define NUM_BUTTONS 32
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#define NUM_AXES 32
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#define NUM_HATS 4
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struct udev_joypad
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{
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int fd;
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dev_t device;
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// Input state polled
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bool buttons[NUM_BUTTONS];
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int16_t axes[NUM_AXES];
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int8_t hats[NUM_HATS][2];
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// Maps keycodes -> button/axes
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uint8_t button_bind[KEY_MAX];
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uint8_t axes_bind[ABS_MAX];
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struct input_absinfo absinfo[NUM_AXES];
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int num_effects;
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int effects[2]; // [0] - strong, [1] - weak
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bool has_set_ff[2];
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uint16_t strength[2];
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uint16_t configured_strength[2];
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char *ident;
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char *path;
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};
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static struct udev *g_udev;
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static struct udev_monitor *g_udev_mon;
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static struct udev_joypad g_pads[MAX_PLAYERS];
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static inline int16_t compute_axis(const struct input_absinfo *info, int value)
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{
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int range = info->maximum - info->minimum;
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int axis = (value - info->minimum) * 0xffffll / range - 0x7fffll;
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if (axis > 0x7fff)
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return 0x7fff;
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else if (axis < -0x7fff)
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return -0x7fff;
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else
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return axis;
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}
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static void poll_pad(unsigned p)
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{
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struct udev_joypad *pad = &g_pads[p];
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if (pad->fd < 0)
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return;
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int i, len;
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struct input_event events[32];
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while ((len = read(pad->fd, events, sizeof(events))) > 0)
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{
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len /= sizeof(*events);
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for (i = 0; i < len; i++)
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{
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int code = events[i].code;
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switch (events[i].type)
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{
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case EV_KEY:
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if (code >= BTN_MISC || (code >= KEY_UP && code <= KEY_DOWN))
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pad->buttons[pad->button_bind[code]] = events[i].value;
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break;
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case EV_ABS:
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if (code >= ABS_MISC)
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break;
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switch (code)
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{
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case ABS_HAT0X:
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case ABS_HAT0Y:
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case ABS_HAT1X:
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case ABS_HAT1Y:
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case ABS_HAT2X:
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case ABS_HAT2Y:
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case ABS_HAT3X:
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case ABS_HAT3Y:
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{
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code -= ABS_HAT0X;
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pad->hats[code >> 1][code & 1] = events[i].value;
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break;
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}
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default:
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{
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unsigned axis = pad->axes_bind[code];
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pad->axes[axis] = compute_axis(&pad->absinfo[axis], events[i].value);
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break;
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}
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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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}
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}
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static bool hotplug_available(void)
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{
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if (!g_udev_mon)
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return false;
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struct pollfd fds = {0};
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fds.fd = udev_monitor_get_fd(g_udev_mon);
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fds.events = POLLIN;
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return (poll(&fds, 1, 0) == 1) && (fds.revents & POLLIN);
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}
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static void check_device(const char *path, bool hotplugged);
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static void remove_device(const char *path);
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static void handle_hotplug(void)
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{
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struct udev_device *dev = udev_monitor_receive_device(g_udev_mon);
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if (!dev)
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return;
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const char *val = udev_device_get_property_value(dev, "ID_INPUT_JOYSTICK");
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const char *action = udev_device_get_action(dev);
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const char *devnode = udev_device_get_devnode(dev);
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if (!val || strcmp(val, "1") || !devnode)
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goto end;
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if (!strcmp(action, "add"))
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{
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RARCH_LOG("[udev]: Hotplug add: %s.\n", devnode);
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check_device(devnode, true);
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}
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else if (!strcmp(action, "remove"))
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{
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RARCH_LOG("[udev]: Hotplug remove: %s.\n", devnode);
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remove_device(devnode);
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}
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end:
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udev_device_unref(dev);
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}
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static bool udev_set_rumble(unsigned i, enum retro_rumble_effect effect, uint16_t strength)
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{
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struct udev_joypad *pad = &g_pads[i];
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if (pad->fd < 0)
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return false;
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if (pad->num_effects < 2)
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return false;
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uint16_t old_strength = pad->strength[effect];
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if (old_strength == strength)
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return true;
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int old_effect = pad->has_set_ff[effect] ? pad->effects[effect] : -1;
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if (strength && strength != pad->configured_strength[effect])
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{
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// Create new or update old playing state.
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struct ff_effect e;
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memset(&e, 0, sizeof(e));
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e.type = FF_RUMBLE;
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e.id = old_effect;
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switch (effect)
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{
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case RETRO_RUMBLE_STRONG: e.u.rumble.strong_magnitude = strength; break;
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case RETRO_RUMBLE_WEAK: e.u.rumble.weak_magnitude = strength; break;
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default: return false;
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}
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if (ioctl(pad->fd, EVIOCSFF, &e) < 0)
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{
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RARCH_ERR("Failed to set rumble effect on pad #%u.\n", i);
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return false;
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}
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pad->effects[effect] = e.id;
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pad->has_set_ff[effect] = true;
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pad->configured_strength[effect] = strength;
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}
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pad->strength[effect] = strength;
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// It seems that we can update strength with EVIOCSFF atomically.
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if ((!!strength) != (!!old_strength))
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{
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struct input_event play;
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memset(&play, 0, sizeof(play));
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play.type = EV_FF;
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play.code = pad->effects[effect];
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play.value = !!strength;
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if (write(pad->fd, &play, sizeof(play)) < (ssize_t)sizeof(play))
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{
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RARCH_ERR("[udev]: Failed to play rumble effect #%u on pad #%u.\n",
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effect, i);
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return false;
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}
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}
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return true;
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}
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static void udev_joypad_poll(void)
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{
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unsigned i;
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while (hotplug_available())
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handle_hotplug();
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for (i = 0; i < MAX_PLAYERS; i++)
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poll_pad(i);
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}
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#define test_bit(nr, addr) \
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(((1UL << ((nr) % (sizeof(long) * CHAR_BIT))) & ((addr)[(nr) / (sizeof(long) * CHAR_BIT)])) != 0)
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#define NBITS(x) ((((x) - 1) / (sizeof(long) * CHAR_BIT)) + 1)
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static int open_joystick(const char *path)
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{
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int fd = open(path, O_RDWR | O_NONBLOCK);
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if (fd < 0)
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return fd;
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unsigned long evbit[NBITS(EV_MAX)] = {0};
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unsigned long keybit[NBITS(KEY_MAX)] = {0};
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unsigned long absbit[NBITS(ABS_MAX)] = {0};
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if ((ioctl(fd, EVIOCGBIT(0, sizeof(evbit)), evbit) < 0) ||
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(ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(keybit)), keybit) < 0) ||
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(ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(absbit)), absbit) < 0))
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goto error;
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// Has to at least support EV_KEY interface.
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if (!test_bit(EV_KEY, evbit))
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goto error;
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return fd;
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error:
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close(fd);
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return -1;
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}
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static int find_vacant_pad(void)
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{
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unsigned i;
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for (i = 0; i < MAX_PLAYERS; i++)
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if (g_pads[i].fd < 0)
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return i;
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return -1;
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}
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static void free_pad(unsigned pad, bool hotplug)
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{
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if (g_pads[pad].fd >= 0)
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close(g_pads[pad].fd);
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free(g_pads[pad].path);
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if (g_pads[pad].ident)
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*g_pads[pad].ident = '\0';
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memset(&g_pads[pad], 0, sizeof(g_pads[pad]));
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g_pads[pad].fd = -1;
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g_pads[pad].ident = g_settings.input.device_names[pad];
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// Avoid autoconfig spam if we're reiniting driver.
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if (hotplug)
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input_config_autoconfigure_joypad(pad, NULL, NULL);
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}
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static bool add_pad(unsigned p, int fd, const char *path)
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{
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int i;
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struct udev_joypad *pad = &g_pads[p];
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if (ioctl(fd, EVIOCGNAME(sizeof(g_settings.input.device_names[0])), pad->ident) < 0)
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{
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RARCH_LOG("[udev]: Failed to get pad name.\n");
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return false;
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}
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RARCH_LOG("[udev]: Plugged pad: %s on port #%u.\n", pad->ident, p);
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struct stat st;
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if (fstat(fd, &st) < 0)
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return false;
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unsigned long keybit[NBITS(KEY_MAX)] = {0};
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unsigned long absbit[NBITS(ABS_MAX)] = {0};
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if ((ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(keybit)), keybit) < 0) ||
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(ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(absbit)), absbit) < 0))
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return false;
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// Go through all possible keycodes, check if they are used,
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// and map them to button/axes/hat indices.
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unsigned buttons = 0;
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unsigned axes = 0;
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for (i = KEY_UP; i <= KEY_DOWN && buttons < NUM_BUTTONS; i++)
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if (test_bit(i, keybit))
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pad->button_bind[i] = buttons++;
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for (i = BTN_MISC; i < KEY_MAX && buttons < NUM_BUTTONS; i++)
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if (test_bit(i, keybit))
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pad->button_bind[i] = buttons++;
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for (i = 0; i < ABS_MISC && axes < NUM_AXES; i++)
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{
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// Skip hats for now.
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if (i == ABS_HAT0X)
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{
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i = ABS_HAT3Y;
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continue;
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}
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if (test_bit(i, absbit))
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{
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struct input_absinfo *abs = &pad->absinfo[axes];
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if (ioctl(fd, EVIOCGABS(i), abs) < 0)
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continue;
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if (abs->maximum > abs->minimum)
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{
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pad->axes[axes] = compute_axis(abs, abs->value);
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pad->axes_bind[i] = axes++;
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}
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}
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}
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pad->device = st.st_rdev;
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pad->fd = fd;
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pad->path = strdup(path);
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if (*pad->ident)
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input_config_autoconfigure_joypad(p, pad->ident, "udev");
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// Check for rumble features.
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unsigned long ffbit[NBITS(FF_MAX)] = {0};
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if (ioctl(fd, EVIOCGBIT(EV_FF, sizeof(ffbit)), ffbit) >= 0)
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{
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if (test_bit(FF_RUMBLE, ffbit))
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RARCH_LOG("[udev]: Pad #%u (%s) supports force feedback.\n",
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p, path);
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if (ioctl(fd, EVIOCGEFFECTS, &pad->num_effects) >= 0)
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RARCH_LOG("[udev]: Pad #%u (%s) supports %d force feedback effects.\n", p, path, pad->num_effects);
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}
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return true;
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}
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static void check_device(const char *path, bool hotplugged)
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{
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unsigned i;
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struct stat st;
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if (stat(path, &st) < 0)
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return;
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for (i = 0; i < MAX_PLAYERS; i++)
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{
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if (st.st_rdev == g_pads[i].device)
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{
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RARCH_LOG("[udev]: Device ID %u is already plugged.\n", (unsigned)st.st_rdev);
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return;
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}
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}
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int pad = find_vacant_pad();
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if (pad < 0)
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return;
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int fd = open_joystick(path);
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if (fd < 0)
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return;
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if (add_pad(pad, fd, path))
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{
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#ifndef IS_JOYCONFIG
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if (hotplugged)
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{
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char msg[512];
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snprintf(msg, sizeof(msg), "Joypad #%u (%s) connected.", pad, path);
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msg_queue_push(g_extern.msg_queue, msg, 0, 60);
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RARCH_LOG("[udev]: %s\n", msg);
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}
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#else
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(void)hotplugged;
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#endif
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}
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else
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{
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RARCH_ERR("[udev]: Failed to add pad: %s.\n", path);
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close(fd);
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}
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}
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static void remove_device(const char *path)
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{
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unsigned i;
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for (i = 0; i < MAX_PLAYERS; i++)
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{
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if (g_pads[i].path && !strcmp(g_pads[i].path, path))
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{
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#ifndef IS_JOYCONFIG
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char msg[512];
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snprintf(msg, sizeof(msg), "Joypad #%u (%s) disconnected.", i, g_pads[i].ident);
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msg_queue_push(g_extern.msg_queue, msg, 0, 60);
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RARCH_LOG("[udev]: %s\n", msg);
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#endif
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free_pad(i, true);
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break;
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}
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}
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}
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static void udev_joypad_destroy(void)
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{
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unsigned i;
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for (i = 0; i < MAX_PLAYERS; i++)
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free_pad(i, false);
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if (g_udev_mon)
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udev_monitor_unref(g_udev_mon);
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g_udev_mon = NULL;
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if (g_udev)
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udev_unref(g_udev);
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g_udev = NULL;
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}
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static bool udev_joypad_init(void)
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{
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unsigned i;
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for (i = 0; i < MAX_PLAYERS; i++)
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{
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g_pads[i].fd = -1;
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g_pads[i].ident = g_settings.input.device_names[i];
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}
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struct udev_list_entry *devs = NULL;
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struct udev_list_entry *item = NULL;
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g_udev = udev_new();
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if (!g_udev)
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return false;
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g_udev_mon = udev_monitor_new_from_netlink(g_udev, "udev");
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if (g_udev_mon)
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{
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udev_monitor_filter_add_match_subsystem_devtype(g_udev_mon, "input", NULL);
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udev_monitor_enable_receiving(g_udev_mon);
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}
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struct udev_enumerate *enumerate = udev_enumerate_new(g_udev);
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if (!enumerate)
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goto error;
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udev_enumerate_add_match_property(enumerate, "ID_INPUT_JOYSTICK", "1");
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udev_enumerate_scan_devices(enumerate);
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devs = udev_enumerate_get_list_entry(enumerate);
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for (item = devs; item; item = udev_list_entry_get_next(item))
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{
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const char *name = udev_list_entry_get_name(item);
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struct udev_device *dev = udev_device_new_from_syspath(g_udev, name);
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const char *devnode = udev_device_get_devnode(dev);
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if (devnode)
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check_device(devnode, false);
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udev_device_unref(dev);
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}
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udev_enumerate_unref(enumerate);
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return true;
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error:
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if (enumerate)
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udev_enumerate_unref(enumerate);
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udev_joypad_destroy();
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return false;
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}
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static bool udev_joypad_hat(const struct udev_joypad *pad, uint16_t hat)
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{
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unsigned h = GET_HAT(hat);
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if (h >= NUM_HATS)
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return false;
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switch (GET_HAT_DIR(hat))
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{
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case HAT_LEFT_MASK: return pad->hats[h][0] < 0;
|
|
case HAT_RIGHT_MASK: return pad->hats[h][0] > 0;
|
|
case HAT_UP_MASK: return pad->hats[h][1] < 0;
|
|
case HAT_DOWN_MASK: return pad->hats[h][1] > 0;
|
|
default: return 0;
|
|
}
|
|
}
|
|
|
|
static bool udev_joypad_button(unsigned port, uint16_t joykey)
|
|
{
|
|
const struct udev_joypad *pad = &g_pads[port];
|
|
|
|
if (GET_HAT_DIR(joykey))
|
|
return udev_joypad_hat(pad, joykey);
|
|
else
|
|
return joykey < NUM_BUTTONS && pad->buttons[joykey];
|
|
}
|
|
|
|
static int16_t udev_joypad_axis(unsigned port, uint32_t joyaxis)
|
|
{
|
|
if (joyaxis == AXIS_NONE)
|
|
return 0;
|
|
|
|
const struct udev_joypad *pad = &g_pads[port];
|
|
|
|
int16_t val = 0;
|
|
if (AXIS_NEG_GET(joyaxis) < NUM_AXES)
|
|
{
|
|
val = pad->axes[AXIS_NEG_GET(joyaxis)];
|
|
if (val > 0)
|
|
val = 0;
|
|
}
|
|
else if (AXIS_POS_GET(joyaxis) < NUM_AXES)
|
|
{
|
|
val = pad->axes[AXIS_POS_GET(joyaxis)];
|
|
if (val < 0)
|
|
val = 0;
|
|
}
|
|
|
|
return val;
|
|
}
|
|
|
|
static bool udev_joypad_query_pad(unsigned pad)
|
|
{
|
|
return pad < MAX_PLAYERS && g_pads[pad].fd >= 0;
|
|
}
|
|
|
|
static const char *udev_joypad_name(unsigned pad)
|
|
{
|
|
if (pad >= MAX_PLAYERS)
|
|
return NULL;
|
|
|
|
return *g_pads[pad].ident ? g_pads[pad].ident : NULL;
|
|
}
|
|
|
|
const rarch_joypad_driver_t udev_joypad = {
|
|
udev_joypad_init,
|
|
udev_joypad_query_pad,
|
|
udev_joypad_destroy,
|
|
udev_joypad_button,
|
|
udev_joypad_axis,
|
|
udev_joypad_poll,
|
|
udev_set_rumble,
|
|
udev_joypad_name,
|
|
"udev",
|
|
};
|
|
|