mirror of
https://github.com/CTCaer/RetroArch.git
synced 2024-12-28 05:38:24 +00:00
668 lines
17 KiB
C
668 lines
17 KiB
C
/* RetroArch - A frontend for libretro.
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* Copyright (C) 2010-2015 - 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_autodetect.h"
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#include "../input_common.h"
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#include "../../general.h"
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#include "../../runloop.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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#include <retro_inline.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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*
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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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*/
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#define UDEV_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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uint64_t 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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int32_t vid;
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int32_t pid;
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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 udev_pads[MAX_USERS];
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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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return axis;
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}
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static void udev_poll_pad(struct udev_joypad *pad, unsigned p)
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{
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int i, len;
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struct input_event events[32];
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if (pad->fd < 0)
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return;
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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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{
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if (events[i].value)
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BIT64_SET(pad->buttons, pad->button_bind[code]);
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else
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BIT64_CLEAR(pad->buttons, pad->button_bind[code]);
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}
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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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struct pollfd fds = {0};
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if (!g_udev_mon)
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return false;
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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(struct udev_device *dev, const char *path, bool hotplugged);
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static void udev_joypad_remove_device(const char *path);
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static void udev_joypad_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(dev, 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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udev_joypad_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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int old_effect;
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uint16_t old_strength;
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struct udev_joypad *pad = (struct udev_joypad*)&udev_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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old_strength = pad->strength[effect];
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if (old_strength == strength)
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return true;
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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:
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e.u.rumble.strong_magnitude = strength;
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break;
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case RETRO_RUMBLE_WEAK:
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e.u.rumble.weak_magnitude = strength;
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break;
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default:
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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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udev_joypad_handle_hotplug();
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for (i = 0; i < MAX_USERS; i++)
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udev_poll_pad(&udev_pads[i], 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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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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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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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_USERS; i++)
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if (udev_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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settings_t *settings = config_get_ptr();
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autoconfig_params_t params = {{0}};
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if (udev_pads[pad].fd >= 0)
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close(udev_pads[pad].fd);
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free(udev_pads[pad].path);
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if (udev_pads[pad].ident)
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*udev_pads[pad].ident = '\0';
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memset(&udev_pads[pad], 0, sizeof(udev_pads[pad]));
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udev_pads[pad].fd = -1;
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udev_pads[pad].ident = settings->input.device_names[pad];
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/* Avoid autoconfig spam if we're reiniting driver. */
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/* TODO - implement VID/PID? */
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if (hotplug)
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{
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params.idx = pad;
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input_config_autoconfigure_joypad(¶ms);
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}
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}
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static bool add_pad(struct udev_device *dev, unsigned p, int fd, const char *path)
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{
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int i;
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const char *buf;
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struct stat st;
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struct udev_device *parent;
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struct udev_joypad *pad = (struct udev_joypad*)&udev_pads[p];
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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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unsigned long ffbit[NBITS(FF_MAX)] = {0};
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unsigned buttons = 0, axes = 0;
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settings_t *settings = config_get_ptr();
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autoconfig_params_t params = {{0}};
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if (ioctl(fd, EVIOCGNAME(sizeof(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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/* Don't worry about unref'ing the parent. */
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parent = udev_device_get_parent_with_subsystem_devtype(dev, "usb", "usb_device");
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pad->vid = pad->pid = 0;
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if ((buf = udev_device_get_sysattr_value(parent, "idVendor")) != NULL)
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pad->vid = strtol(buf, NULL, 16);
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if ((buf = udev_device_get_sysattr_value(parent, "idProduct")) != NULL)
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pad->pid = strtol(buf, NULL, 16);
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RARCH_LOG("[udev]: Plugged pad: %s (%04x:%04x) on port #%u.\n",
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pad->ident, pad->vid, pad->pid, p);
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if (fstat(fd, &st) < 0)
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return false;
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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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*/
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for (i = KEY_UP; i <= KEY_DOWN && buttons < UDEV_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 < UDEV_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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{
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params.idx = p;
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strlcpy(params.name, pad->ident, sizeof(params.name));
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params.vid = pad->vid;
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params.pid = pad->pid;
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strlcpy(params.driver, udev_joypad.ident, sizeof(params.driver));
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input_config_autoconfigure_joypad(¶ms);
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}
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/* Check for rumble features. */
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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(struct udev_device *dev, const char *path, bool hotplugged)
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{
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int pad, fd;
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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_USERS; i++)
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{
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if (st.st_rdev == udev_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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pad = find_vacant_pad();
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if (pad < 0)
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return;
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fd = open_joystick(path);
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if (fd < 0)
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return;
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if (add_pad(dev, 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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rarch_main_msg_queue_push(msg, 0, 60, false);
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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 udev_joypad_remove_device(const char *path)
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{
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unsigned i;
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for (i = 0; i < MAX_USERS; i++)
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{
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if (udev_pads[i].path && !strcmp(udev_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, udev_pads[i].ident);
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rarch_main_msg_queue_push(msg, 0, 60, false);
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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_USERS; 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;
|
|
struct udev_list_entry *devs = NULL;
|
|
struct udev_list_entry *item = NULL;
|
|
struct udev_enumerate *enumerate = NULL;
|
|
settings_t *settings = config_get_ptr();
|
|
|
|
for (i = 0; i < MAX_USERS; i++)
|
|
{
|
|
udev_pads[i].fd = -1;
|
|
udev_pads[i].ident = settings->input.device_names[i];
|
|
}
|
|
|
|
g_udev = udev_new();
|
|
if (!g_udev)
|
|
return false;
|
|
|
|
g_udev_mon = udev_monitor_new_from_netlink(g_udev, "udev");
|
|
if (g_udev_mon)
|
|
{
|
|
udev_monitor_filter_add_match_subsystem_devtype(g_udev_mon, "input", NULL);
|
|
udev_monitor_enable_receiving(g_udev_mon);
|
|
}
|
|
|
|
enumerate = udev_enumerate_new(g_udev);
|
|
if (!enumerate)
|
|
goto error;
|
|
|
|
udev_enumerate_add_match_property(enumerate, "ID_INPUT_JOYSTICK", "1");
|
|
udev_enumerate_scan_devices(enumerate);
|
|
devs = udev_enumerate_get_list_entry(enumerate);
|
|
|
|
for (item = devs; item; item = udev_list_entry_get_next(item))
|
|
{
|
|
const char *name = udev_list_entry_get_name(item);
|
|
struct udev_device *dev = udev_device_new_from_syspath(g_udev, name);
|
|
const char *devnode = udev_device_get_devnode(dev);
|
|
|
|
if (devnode)
|
|
check_device(dev, devnode, false);
|
|
udev_device_unref(dev);
|
|
}
|
|
|
|
udev_enumerate_unref(enumerate);
|
|
return true;
|
|
|
|
error:
|
|
if (enumerate)
|
|
udev_enumerate_unref(enumerate);
|
|
udev_joypad_destroy();
|
|
return false;
|
|
}
|
|
|
|
static bool udev_joypad_hat(const struct udev_joypad *pad, uint16_t hat)
|
|
{
|
|
unsigned h = GET_HAT(hat);
|
|
|
|
if (h >= NUM_HATS)
|
|
return false;
|
|
|
|
switch (GET_HAT_DIR(hat))
|
|
{
|
|
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;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool udev_joypad_button(unsigned port, uint16_t joykey)
|
|
{
|
|
const struct udev_joypad *pad = (const struct udev_joypad*)&udev_pads[port];
|
|
|
|
if (GET_HAT_DIR(joykey))
|
|
return udev_joypad_hat(pad, joykey);
|
|
return joykey < UDEV_NUM_BUTTONS && BIT64_GET(pad->buttons, joykey);
|
|
}
|
|
|
|
static uint64_t udev_joypad_get_buttons(unsigned port)
|
|
{
|
|
const struct udev_joypad *pad = (const struct udev_joypad*)&udev_pads[port];
|
|
if (!pad)
|
|
return 0;
|
|
return pad->buttons;
|
|
}
|
|
|
|
static int16_t udev_joypad_axis(unsigned port, uint32_t joyaxis)
|
|
{
|
|
int16_t val = 0;
|
|
const struct udev_joypad *pad;
|
|
if (joyaxis == AXIS_NONE)
|
|
return 0;
|
|
|
|
pad = (const struct udev_joypad*)&udev_pads[port];
|
|
|
|
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_USERS && udev_pads[pad].fd >= 0;
|
|
}
|
|
|
|
static const char *udev_joypad_name(unsigned pad)
|
|
{
|
|
if (pad >= MAX_USERS)
|
|
return NULL;
|
|
|
|
return *udev_pads[pad].ident ? udev_pads[pad].ident : NULL;
|
|
}
|
|
|
|
rarch_joypad_driver_t udev_joypad = {
|
|
udev_joypad_init,
|
|
udev_joypad_query_pad,
|
|
udev_joypad_destroy,
|
|
udev_joypad_button,
|
|
udev_joypad_get_buttons,
|
|
udev_joypad_axis,
|
|
udev_joypad_poll,
|
|
udev_set_rumble,
|
|
udev_joypad_name,
|
|
"udev",
|
|
};
|