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cdev.c
(21.91 KB)
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evdev.c
(28.69 KB)
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evdev.h
(7.22 KB)
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evdev_mt.c
(7.34 KB)
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evdev_private.h
(9.48 KB)
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evdev_utils.c
(9.08 KB)
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input-event-codes.h
(28.41 KB)
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input.h
(8.24 KB)
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uinput.c
(16.45 KB)
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uinput.h
(3.84 KB)
Editing: uinput.c
/*- * Copyright (c) 2014 Jakub Wojciech Klama <jceel@FreeBSD.org> * Copyright (c) 2015-2016 Vladimir Kondratyev <wulf@FreeBSD.org> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD$ */ #include "opt_evdev.h" #include <sys/param.h> #include <sys/conf.h> #include <sys/fcntl.h> #include <sys/kernel.h> #include <sys/lock.h> #include <sys/malloc.h> #include <sys/module.h> #include <sys/poll.h> #include <sys/proc.h> #include <sys/selinfo.h> #include <sys/systm.h> #include <sys/sx.h> #include <sys/uio.h> #include <dev/evdev/evdev.h> #include <dev/evdev/evdev_private.h> #include <dev/evdev/input.h> #include <dev/evdev/uinput.h> #ifdef UINPUT_DEBUG #define debugf(state, fmt, args...) printf("uinput: " fmt "\n", ##args) #else #define debugf(state, fmt, args...) #endif #define UINPUT_BUFFER_SIZE 16 #define UINPUT_LOCK(state) sx_xlock(&(state)->ucs_lock) #define UINPUT_UNLOCK(state) sx_unlock(&(state)->ucs_lock) #define UINPUT_LOCK_ASSERT(state) sx_assert(&(state)->ucs_lock, SA_LOCKED) #define UINPUT_EMPTYQ(state) \ ((state)->ucs_buffer_head == (state)->ucs_buffer_tail) enum uinput_state { UINPUT_NEW = 0, UINPUT_CONFIGURED, UINPUT_RUNNING }; static evdev_event_t uinput_ev_event; static d_open_t uinput_open; static d_read_t uinput_read; static d_write_t uinput_write; static d_ioctl_t uinput_ioctl; static d_poll_t uinput_poll; static d_kqfilter_t uinput_kqfilter; static void uinput_dtor(void *); static int uinput_kqread(struct knote *kn, long hint); static void uinput_kqdetach(struct knote *kn); static struct cdevsw uinput_cdevsw = { .d_version = D_VERSION, .d_open = uinput_open, .d_read = uinput_read, .d_write = uinput_write, .d_ioctl = uinput_ioctl, .d_poll = uinput_poll, .d_kqfilter = uinput_kqfilter, .d_name = "uinput", }; static struct cdev *uinput_cdev; static struct evdev_methods uinput_ev_methods = { .ev_open = NULL, .ev_close = NULL, .ev_event = uinput_ev_event, }; static struct filterops uinput_filterops = { .f_isfd = 1, .f_attach = NULL, .f_detach = uinput_kqdetach, .f_event = uinput_kqread, }; struct uinput_cdev_state { enum uinput_state ucs_state; struct evdev_dev * ucs_evdev; struct sx ucs_lock; size_t ucs_buffer_head; size_t ucs_buffer_tail; struct selinfo ucs_selp; bool ucs_blocked; bool ucs_selected; struct input_event ucs_buffer[UINPUT_BUFFER_SIZE]; }; static void uinput_enqueue_event(struct uinput_cdev_state *, uint16_t, uint16_t, int32_t); static int uinput_setup_provider(struct uinput_cdev_state *, struct uinput_user_dev *); static int uinput_cdev_create(void); static void uinput_notify(struct uinput_cdev_state *); static void uinput_knllock(void *arg) { struct sx *sx = arg; sx_xlock(sx); } static void uinput_knlunlock(void *arg) { struct sx *sx = arg; sx_unlock(sx); } static void uinput_knl_assert_lock(void *arg, int what) { if (what == LA_LOCKED) sx_assert((struct sx*)arg, SA_XLOCKED); else sx_assert((struct sx*)arg, SA_UNLOCKED); } static void uinput_ev_event(struct evdev_dev *evdev, uint16_t type, uint16_t code, int32_t value) { struct uinput_cdev_state *state = evdev_get_softc(evdev); if (type == EV_LED) evdev_push_event(evdev, type, code, value); UINPUT_LOCK(state); if (state->ucs_state == UINPUT_RUNNING) { uinput_enqueue_event(state, type, code, value); uinput_notify(state); } UINPUT_UNLOCK(state); } static void uinput_enqueue_event(struct uinput_cdev_state *state, uint16_t type, uint16_t code, int32_t value) { size_t head, tail; UINPUT_LOCK_ASSERT(state); head = state->ucs_buffer_head; tail = (state->ucs_buffer_tail + 1) % UINPUT_BUFFER_SIZE; microtime(&state->ucs_buffer[tail].time); state->ucs_buffer[tail].type = type; state->ucs_buffer[tail].code = code; state->ucs_buffer[tail].value = value; state->ucs_buffer_tail = tail; /* If queue is full remove oldest event */ if (tail == head) { debugf(state, "state %p: buffer overflow", state); head = (head + 1) % UINPUT_BUFFER_SIZE; state->ucs_buffer_head = head; } } static int uinput_open(struct cdev *dev, int oflags, int devtype, struct thread *td) { struct uinput_cdev_state *state; state = malloc(sizeof(struct uinput_cdev_state), M_EVDEV, M_WAITOK | M_ZERO); state->ucs_evdev = evdev_alloc(); sx_init(&state->ucs_lock, "uinput"); knlist_init(&state->ucs_selp.si_note, &state->ucs_lock, uinput_knllock, uinput_knlunlock, uinput_knl_assert_lock); devfs_set_cdevpriv(state, uinput_dtor); return (0); } static void uinput_dtor(void *data) { struct uinput_cdev_state *state = (struct uinput_cdev_state *)data; evdev_free(state->ucs_evdev); knlist_clear(&state->ucs_selp.si_note, 0); seldrain(&state->ucs_selp); knlist_destroy(&state->ucs_selp.si_note); sx_destroy(&state->ucs_lock); free(data, M_EVDEV); } static int uinput_read(struct cdev *dev, struct uio *uio, int ioflag) { struct uinput_cdev_state *state; struct input_event *event; int remaining, ret; ret = devfs_get_cdevpriv((void **)&state); if (ret != 0) return (ret); debugf(state, "read %zd bytes by thread %d", uio->uio_resid, uio->uio_td->td_tid); /* Zero-sized reads are allowed for error checking */ if (uio->uio_resid != 0 && uio->uio_resid < sizeof(struct input_event)) return (EINVAL); remaining = uio->uio_resid / sizeof(struct input_event); UINPUT_LOCK(state); if (state->ucs_state != UINPUT_RUNNING) ret = EINVAL; if (ret == 0 && UINPUT_EMPTYQ(state)) { if (ioflag & O_NONBLOCK) ret = EWOULDBLOCK; else { if (remaining != 0) { state->ucs_blocked = true; ret = sx_sleep(state, &state->ucs_lock, PCATCH, "uiread", 0); } } } while (ret == 0 && !UINPUT_EMPTYQ(state) && remaining > 0) { event = &state->ucs_buffer[state->ucs_buffer_head]; state->ucs_buffer_head = (state->ucs_buffer_head + 1) % UINPUT_BUFFER_SIZE; remaining--; ret = uiomove(event, sizeof(struct input_event), uio); } UINPUT_UNLOCK(state); return (ret); } static int uinput_write(struct cdev *dev, struct uio *uio, int ioflag) { struct uinput_cdev_state *state; struct uinput_user_dev userdev; struct input_event event; int ret = 0; ret = devfs_get_cdevpriv((void **)&state); if (ret != 0) return (ret); debugf(state, "write %zd bytes by thread %d", uio->uio_resid, uio->uio_td->td_tid); UINPUT_LOCK(state); if (state->ucs_state != UINPUT_RUNNING) { /* Process written struct uinput_user_dev */ if (uio->uio_resid != sizeof(struct uinput_user_dev)) { debugf(state, "write size not multiple of " "struct uinput_user_dev size"); ret = EINVAL; } else { ret = uiomove(&userdev, sizeof(struct uinput_user_dev), uio); if (ret == 0) uinput_setup_provider(state, &userdev); } } else { /* Process written event */ if (uio->uio_resid % sizeof(struct input_event) != 0) { debugf(state, "write size not multiple of " "struct input_event size"); ret = EINVAL; } while (ret == 0 && uio->uio_resid > 0) { uiomove(&event, sizeof(struct input_event), uio); ret = evdev_push_event(state->ucs_evdev, event.type, event.code, event.value); } } UINPUT_UNLOCK(state); return (ret); } static int uinput_setup_dev(struct uinput_cdev_state *state, struct input_id *id, char *name, uint32_t ff_effects_max) { if (name[0] == 0) return (EINVAL); evdev_set_name(state->ucs_evdev, name); evdev_set_id(state->ucs_evdev, id->bustype, id->vendor, id->product, id->version); state->ucs_state = UINPUT_CONFIGURED; return (0); } static int uinput_setup_provider(struct uinput_cdev_state *state, struct uinput_user_dev *udev) { struct input_absinfo absinfo; int i, ret; debugf(state, "setup_provider called, udev=%p", udev); ret = uinput_setup_dev(state, &udev->id, udev->name, udev->ff_effects_max); if (ret) return (ret); bzero(&absinfo, sizeof(struct input_absinfo)); for (i = 0; i < ABS_CNT; i++) { if (!bit_test(state->ucs_evdev->ev_abs_flags, i)) continue; absinfo.minimum = udev->absmin[i]; absinfo.maximum = udev->absmax[i]; absinfo.fuzz = udev->absfuzz[i]; absinfo.flat = udev->absflat[i]; evdev_set_absinfo(state->ucs_evdev, i, &absinfo); } return (0); } static int uinput_poll(struct cdev *dev, int events, struct thread *td) { struct uinput_cdev_state *state; int revents = 0; if (devfs_get_cdevpriv((void **)&state) != 0) return (POLLNVAL); debugf(state, "poll by thread %d", td->td_tid); /* Always allow write */ if (events & (POLLOUT | POLLWRNORM)) revents |= (events & (POLLOUT | POLLWRNORM)); if (events & (POLLIN | POLLRDNORM)) { UINPUT_LOCK(state); if (!UINPUT_EMPTYQ(state)) revents = events & (POLLIN | POLLRDNORM); else { state->ucs_selected = true; selrecord(td, &state->ucs_selp); } UINPUT_UNLOCK(state); } return (revents); } static int uinput_kqfilter(struct cdev *dev, struct knote *kn) { struct uinput_cdev_state *state; int ret; ret = devfs_get_cdevpriv((void **)&state); if (ret != 0) return (ret); switch(kn->kn_filter) { case EVFILT_READ: kn->kn_fop = &uinput_filterops; break; default: return(EINVAL); } kn->kn_hook = (caddr_t)state; knlist_add(&state->ucs_selp.si_note, kn, 0); return (0); } static int uinput_kqread(struct knote *kn, long hint) { struct uinput_cdev_state *state; int ret; state = (struct uinput_cdev_state *)kn->kn_hook; UINPUT_LOCK_ASSERT(state); ret = !UINPUT_EMPTYQ(state); return (ret); } static void uinput_kqdetach(struct knote *kn) { struct uinput_cdev_state *state; state = (struct uinput_cdev_state *)kn->kn_hook; knlist_remove(&state->ucs_selp.si_note, kn, 0); } static void uinput_notify(struct uinput_cdev_state *state) { UINPUT_LOCK_ASSERT(state); if (state->ucs_blocked) { state->ucs_blocked = false; wakeup(state); } if (state->ucs_selected) { state->ucs_selected = false; selwakeup(&state->ucs_selp); } KNOTE_LOCKED(&state->ucs_selp.si_note, 0); } static int uinput_ioctl_sub(struct uinput_cdev_state *state, u_long cmd, caddr_t data) { struct uinput_setup *us; struct uinput_abs_setup *uabs; int ret, len, intdata; char buf[NAMELEN]; UINPUT_LOCK_ASSERT(state); len = IOCPARM_LEN(cmd); if ((cmd & IOC_DIRMASK) == IOC_VOID && len == sizeof(int)) intdata = *(int *)data; switch (IOCBASECMD(cmd)) { case UI_GET_SYSNAME(0): if (state->ucs_state != UINPUT_RUNNING) return (ENOENT); if (len == 0) return (EINVAL); snprintf(data, len, "event%d", state->ucs_evdev->ev_unit); return (0); } switch (cmd) { case UI_DEV_CREATE: if (state->ucs_state != UINPUT_CONFIGURED) return (EINVAL); evdev_set_methods(state->ucs_evdev, state, &uinput_ev_methods); evdev_set_flag(state->ucs_evdev, EVDEV_FLAG_SOFTREPEAT); ret = evdev_register(state->ucs_evdev); if (ret == 0) state->ucs_state = UINPUT_RUNNING; return (ret); case UI_DEV_DESTROY: if (state->ucs_state != UINPUT_RUNNING) return (0); evdev_unregister(state->ucs_evdev); bzero(state->ucs_evdev, sizeof(struct evdev_dev)); state->ucs_state = UINPUT_NEW; return (0); case UI_DEV_SETUP: if (state->ucs_state == UINPUT_RUNNING) return (EINVAL); us = (struct uinput_setup *)data; return (uinput_setup_dev(state, &us->id, us->name, us->ff_effects_max)); case UI_ABS_SETUP: if (state->ucs_state == UINPUT_RUNNING) return (EINVAL); uabs = (struct uinput_abs_setup *)data; if (uabs->code > ABS_MAX) return (EINVAL); evdev_set_abs_bit(state->ucs_evdev, uabs->code); evdev_set_absinfo(state->ucs_evdev, uabs->code, &uabs->absinfo); return (0); case UI_SET_EVBIT: if (state->ucs_state == UINPUT_RUNNING || intdata > EV_MAX || intdata < 0) return (EINVAL); evdev_support_event(state->ucs_evdev, intdata); return (0); case UI_SET_KEYBIT: if (state->ucs_state == UINPUT_RUNNING || intdata > KEY_MAX || intdata < 0) return (EINVAL); evdev_support_key(state->ucs_evdev, intdata); return (0); case UI_SET_RELBIT: if (state->ucs_state == UINPUT_RUNNING || intdata > REL_MAX || intdata < 0) return (EINVAL); evdev_support_rel(state->ucs_evdev, intdata); return (0); case UI_SET_ABSBIT: if (state->ucs_state == UINPUT_RUNNING || intdata > ABS_MAX || intdata < 0) return (EINVAL); evdev_set_abs_bit(state->ucs_evdev, intdata); return (0); case UI_SET_MSCBIT: if (state->ucs_state == UINPUT_RUNNING || intdata > MSC_MAX || intdata < 0) return (EINVAL); evdev_support_msc(state->ucs_evdev, intdata); return (0); case UI_SET_LEDBIT: if (state->ucs_state == UINPUT_RUNNING || intdata > LED_MAX || intdata < 0) return (EINVAL); evdev_support_led(state->ucs_evdev, intdata); return (0); case UI_SET_SNDBIT: if (state->ucs_state == UINPUT_RUNNING || intdata > SND_MAX || intdata < 0) return (EINVAL); evdev_support_snd(state->ucs_evdev, intdata); return (0); case UI_SET_FFBIT: if (state->ucs_state == UINPUT_RUNNING || intdata > FF_MAX || intdata < 0) return (EINVAL); /* Fake unsupported ioctl */ return (0); case UI_SET_PHYS: if (state->ucs_state == UINPUT_RUNNING) return (EINVAL); ret = copyinstr(*(void **)data, buf, sizeof(buf), NULL); /* Linux returns EINVAL when string does not fit the buffer */ if (ret == ENAMETOOLONG) ret = EINVAL; if (ret != 0) return (ret); evdev_set_phys(state->ucs_evdev, buf); return (0); case UI_SET_BSDUNIQ: if (state->ucs_state == UINPUT_RUNNING) return (EINVAL); ret = copyinstr(*(void **)data, buf, sizeof(buf), NULL); if (ret != 0) return (ret); evdev_set_serial(state->ucs_evdev, buf); return (0); case UI_SET_SWBIT: if (state->ucs_state == UINPUT_RUNNING || intdata > SW_MAX || intdata < 0) return (EINVAL); evdev_support_sw(state->ucs_evdev, intdata); return (0); case UI_SET_PROPBIT: if (state->ucs_state == UINPUT_RUNNING || intdata > INPUT_PROP_MAX || intdata < 0) return (EINVAL); evdev_support_prop(state->ucs_evdev, intdata); return (0); case UI_BEGIN_FF_UPLOAD: case UI_END_FF_UPLOAD: case UI_BEGIN_FF_ERASE: case UI_END_FF_ERASE: if (state->ucs_state == UINPUT_RUNNING) return (EINVAL); /* Fake unsupported ioctl */ return (0); case UI_GET_VERSION: *(unsigned int *)data = UINPUT_VERSION; return (0); } return (EINVAL); } static int uinput_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) { struct uinput_cdev_state *state; int ret; ret = devfs_get_cdevpriv((void **)&state); if (ret != 0) return (ret); debugf(state, "ioctl called: cmd=0x%08lx, data=%p", cmd, data); UINPUT_LOCK(state); ret = uinput_ioctl_sub(state, cmd, data); UINPUT_UNLOCK(state); return (ret); } static int uinput_cdev_create(void) { struct make_dev_args mda; int ret; make_dev_args_init(&mda); mda.mda_flags = MAKEDEV_WAITOK | MAKEDEV_CHECKNAME; mda.mda_devsw = &uinput_cdevsw; mda.mda_uid = UID_ROOT; mda.mda_gid = GID_WHEEL; mda.mda_mode = 0600; ret = make_dev_s(&mda, &uinput_cdev, "uinput"); return (ret); } static int uinput_cdev_destroy(void) { destroy_dev(uinput_cdev); return (0); } static int uinput_modevent(module_t mod __unused, int cmd, void *data) { int ret = 0; switch (cmd) { case MOD_LOAD: ret = uinput_cdev_create(); break; case MOD_UNLOAD: ret = uinput_cdev_destroy(); break; case MOD_SHUTDOWN: break; default: ret = EINVAL; break; } return (ret); } DEV_MODULE(uinput, uinput_modevent, NULL); MODULE_VERSION(uinput, 1); MODULE_DEPEND(uinput, evdev, 1, 1, 1);
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