/* $OpenBSD: uhid.c,v 1.49 2010/08/02 23:17:34 miod Exp $ */ /* $NetBSD: uhid.c,v 1.57 2003/03/11 16:44:00 augustss Exp $ */ /* * Copyright (c) 1998 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Lennart Augustsson (lennart@augustsson.net) at * Carlstedt Research & Technology. * * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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. */ /* * HID spec: http://www.usb.org/developers/devclass_docs/HID1_11.pdf */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef UHID_DEBUG #define DPRINTF(x) do { if (uhiddebug) printf x; } while (0) #define DPRINTFN(n,x) do { if (uhiddebug>(n)) printf x; } while (0) int uhiddebug = 0; #else #define DPRINTF(x) #define DPRINTFN(n,x) #endif struct uhid_softc { struct uhidev sc_hdev; u_char *sc_obuf; struct clist sc_q; struct selinfo sc_rsel; struct process *sc_async; /* process that wants SIGIO */ u_char sc_state; /* driver state */ #define UHID_ASLP 0x01 /* waiting for device data */ #define UHID_IMMED 0x02 /* return read data immediately */ int sc_refcnt; u_char sc_dying; }; #define UHIDUNIT(dev) (minor(dev)) #define UHID_CHUNK 128 /* chunk size for read */ #define UHID_BSIZE 1020 /* buffer size */ void uhid_intr(struct uhidev *, void *, u_int len); int uhid_do_read(struct uhid_softc *, struct uio *uio, int); int uhid_do_write(struct uhid_softc *, struct uio *uio, int); int uhid_do_ioctl(struct uhid_softc*, u_long, caddr_t, int, struct proc *); int uhid_match(struct device *, void *, void *); void uhid_attach(struct device *, struct device *, void *); int uhid_detach(struct device *, int); int uhid_activate(struct device *, int); struct cfdriver uhid_cd = { NULL, "uhid", DV_DULL }; const struct cfattach uhid_ca = { sizeof(struct uhid_softc), uhid_match, uhid_attach, uhid_detach, uhid_activate, }; int uhid_match(struct device *parent, void *match, void *aux) { struct usb_attach_arg *uaa = aux; struct uhidev_attach_arg *uha = (struct uhidev_attach_arg *)uaa; DPRINTF(("uhid_match: report=%d\n", uha->reportid)); if (uha->matchlvl) return (uha->matchlvl); return (UMATCH_IFACECLASS_GENERIC); } void uhid_attach(struct device *parent, struct device *self, void *aux) { struct uhid_softc *sc = (struct uhid_softc *)self; struct usb_attach_arg *uaa = aux; struct uhidev_attach_arg *uha = (struct uhidev_attach_arg *)uaa; int size, repid; void *desc; sc->sc_hdev.sc_intr = uhid_intr; sc->sc_hdev.sc_parent = uha->parent; sc->sc_hdev.sc_report_id = uha->reportid; uhidev_get_report_desc(uha->parent, &desc, &size); repid = uha->reportid; sc->sc_hdev.sc_isize = hid_report_size(desc, size, hid_input, repid); sc->sc_hdev.sc_osize = hid_report_size(desc, size, hid_output, repid); sc->sc_hdev.sc_fsize = hid_report_size(desc, size, hid_feature, repid); printf(": input=%d, output=%d, feature=%d\n", sc->sc_hdev.sc_isize, sc->sc_hdev.sc_osize, sc->sc_hdev.sc_fsize); } int uhid_activate(struct device *self, int act) { struct uhid_softc *sc = (struct uhid_softc *)self; switch (act) { case DVACT_ACTIVATE: break; case DVACT_DEACTIVATE: sc->sc_dying = 1; break; } return (0); } int uhid_detach(struct device *self, int flags) { struct uhid_softc *sc = (struct uhid_softc *)self; int s; int maj, mn; DPRINTF(("uhid_detach: sc=%p flags=%d\n", sc, flags)); sc->sc_dying = 1; if (sc->sc_hdev.sc_state & UHIDEV_OPEN) { s = splusb(); if (--sc->sc_refcnt >= 0) { /* Wake everyone */ wakeup(&sc->sc_q); /* Wait for processes to go away. */ usb_detach_wait(&sc->sc_hdev.sc_dev); } splx(s); } /* locate the major number */ for (maj = 0; maj < nchrdev; maj++) if (cdevsw[maj].d_open == uhidopen) break; /* Nuke the vnodes for any open instances (calls close). */ mn = self->dv_unit; vdevgone(maj, mn, mn, VCHR); #if 0 usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->sc_hdev.sc_parent->sc_udev, &sc->sc_hdev.sc_dev); #endif return (0); } void uhid_intr(struct uhidev *addr, void *data, u_int len) { struct uhid_softc *sc = (struct uhid_softc *)addr; #ifdef UHID_DEBUG if (uhiddebug > 5) { u_int32_t i; DPRINTF(("uhid_intr: data =")); for (i = 0; i < len; i++) DPRINTF((" %02x", ((u_char *)data)[i])); DPRINTF(("\n")); } #endif (void)b_to_q(data, len, &sc->sc_q); if (sc->sc_state & UHID_ASLP) { sc->sc_state &= ~UHID_ASLP; DPRINTFN(5, ("uhid_intr: waking %p\n", &sc->sc_q)); wakeup(&sc->sc_q); } selwakeup(&sc->sc_rsel); if (sc->sc_async != NULL) { DPRINTFN(3, ("uhid_intr: sending SIGIO %p\n", sc->sc_async)); prsignal(sc->sc_async, SIGIO); } } int uhidopen(dev_t dev, int flag, int mode, struct proc *p) { struct uhid_softc *sc; int error; if (UHIDUNIT(dev) >= uhid_cd.cd_ndevs) return (ENXIO); sc = uhid_cd.cd_devs[UHIDUNIT(dev)]; if (sc == NULL) return (ENXIO); DPRINTF(("uhidopen: sc=%p\n", sc)); if (sc->sc_dying) return (ENXIO); error = uhidev_open(&sc->sc_hdev); if (error) return (error); clalloc(&sc->sc_q, UHID_BSIZE, 0); sc->sc_obuf = malloc(sc->sc_hdev.sc_osize, M_USBDEV, M_WAITOK); sc->sc_state &= ~UHID_IMMED; sc->sc_async = NULL; return (0); } int uhidclose(dev_t dev, int flag, int mode, struct proc *p) { struct uhid_softc *sc; sc = uhid_cd.cd_devs[UHIDUNIT(dev)]; DPRINTF(("uhidclose: sc=%p\n", sc)); clfree(&sc->sc_q); free(sc->sc_obuf, M_USBDEV); sc->sc_async = NULL; uhidev_close(&sc->sc_hdev); return (0); } int uhid_do_read(struct uhid_softc *sc, struct uio *uio, int flag) { int s; int error = 0; int extra; size_t length; u_char buffer[UHID_CHUNK]; usbd_status err; DPRINTFN(1, ("uhidread\n")); if (sc->sc_state & UHID_IMMED) { DPRINTFN(1, ("uhidread immed\n")); extra = sc->sc_hdev.sc_report_id != 0; err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT, buffer, sc->sc_hdev.sc_isize + extra); if (err) return (EIO); return (uiomove(buffer+extra, sc->sc_hdev.sc_isize, uio)); } s = splusb(); while (sc->sc_q.c_cc == 0) { if (flag & IO_NDELAY) { splx(s); return (EWOULDBLOCK); } sc->sc_state |= UHID_ASLP; DPRINTFN(5, ("uhidread: sleep on %p\n", &sc->sc_q)); error = tsleep(&sc->sc_q, PZERO | PCATCH, "uhidrea", 0); DPRINTFN(5, ("uhidread: woke, error=%d\n", error)); if (sc->sc_dying) error = EIO; if (error) { sc->sc_state &= ~UHID_ASLP; break; } } splx(s); /* Transfer as many chunks as possible. */ while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0 && !error) { length = min(sc->sc_q.c_cc, uio->uio_resid); if (length > sizeof(buffer)) length = sizeof(buffer); /* Remove a small chunk from the input queue. */ (void) q_to_b(&sc->sc_q, buffer, length); DPRINTFN(5, ("uhidread: got %lu chars\n", (u_long)length)); /* Copy the data to the user process. */ if ((error = uiomove(buffer, length, uio)) != 0) break; } return (error); } int uhidread(dev_t dev, struct uio *uio, int flag) { struct uhid_softc *sc; int error; sc = uhid_cd.cd_devs[UHIDUNIT(dev)]; sc->sc_refcnt++; error = uhid_do_read(sc, uio, flag); if (--sc->sc_refcnt < 0) usb_detach_wakeup(&sc->sc_hdev.sc_dev); return (error); } int uhid_do_write(struct uhid_softc *sc, struct uio *uio, int flag) { int error; int size; usbd_status err; DPRINTFN(1, ("uhidwrite\n")); if (sc->sc_dying) return (EIO); size = sc->sc_hdev.sc_osize; error = 0; if (uio->uio_resid != size) return (EINVAL); error = uiomove(sc->sc_obuf, size, uio); if (!error) { err = uhidev_set_report(&sc->sc_hdev, UHID_OUTPUT_REPORT, sc->sc_obuf, size); if (err) error = EIO; } return (error); } int uhidwrite(dev_t dev, struct uio *uio, int flag) { struct uhid_softc *sc; int error; sc = uhid_cd.cd_devs[UHIDUNIT(dev)]; sc->sc_refcnt++; error = uhid_do_write(sc, uio, flag); if (--sc->sc_refcnt < 0) usb_detach_wakeup(&sc->sc_hdev.sc_dev); return (error); } int uhid_do_ioctl(struct uhid_softc *sc, u_long cmd, caddr_t addr, int flag, struct proc *p) { u_char buffer[UHID_CHUNK]; int size, extra; usbd_status err; int rc; DPRINTFN(2, ("uhidioctl: cmd=%lx\n", cmd)); if (sc->sc_dying) return (EIO); switch (cmd) { case FIONBIO: /* All handled in the upper FS layer. */ break; case FIOASYNC: if (*(int *)addr) { if (sc->sc_async != NULL) return (EBUSY); sc->sc_async = p->p_p; DPRINTF(("uhid_do_ioctl: FIOASYNC %p\n", p)); } else sc->sc_async = NULL; break; /* XXX this is not the most general solution. */ case TIOCSPGRP: if (sc->sc_async == NULL) return (EINVAL); if (*(int *)addr != sc->sc_async->ps_pgid) return (EPERM); break; case USB_SET_IMMED: if (*(int *)addr) { extra = sc->sc_hdev.sc_report_id != 0; err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT, buffer, sc->sc_hdev.sc_isize + extra); if (err) return (EOPNOTSUPP); sc->sc_state |= UHID_IMMED; } else sc->sc_state &= ~UHID_IMMED; break; case USB_GET_DEVICEINFO: usbd_fill_deviceinfo(sc->sc_hdev.sc_parent->sc_udev, (struct usb_device_info *)addr, 1); break; case USB_GET_STRING_DESC: { struct usb_string_desc *si = (struct usb_string_desc *)addr; err = usbd_get_string_desc(sc->sc_hdev.sc_parent->sc_udev, si->usd_string_index, si->usd_language_id, &si->usd_desc, &size); if (err) return (EINVAL); break; } case USB_GET_REPORT_DESC: case USB_GET_REPORT: case USB_SET_REPORT: case USB_GET_REPORT_ID: default: rc = uhidev_ioctl(&sc->sc_hdev, cmd, addr, flag, p); if (rc == -1) rc = EINVAL; return rc; } return (0); } int uhidioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p) { struct uhid_softc *sc; int error; sc = uhid_cd.cd_devs[UHIDUNIT(dev)]; sc->sc_refcnt++; error = uhid_do_ioctl(sc, cmd, addr, flag, p); if (--sc->sc_refcnt < 0) usb_detach_wakeup(&sc->sc_hdev.sc_dev); return (error); } int uhidpoll(dev_t dev, int events, struct proc *p) { struct uhid_softc *sc; int revents = 0; int s; sc = uhid_cd.cd_devs[UHIDUNIT(dev)]; if (sc->sc_dying) return (POLLERR); s = splusb(); if (events & (POLLOUT | POLLWRNORM)) revents |= events & (POLLOUT | POLLWRNORM); if (events & (POLLIN | POLLRDNORM)) { if (sc->sc_q.c_cc > 0) revents |= events & (POLLIN | POLLRDNORM); else selrecord(p, &sc->sc_rsel); } splx(s); return (revents); } void filt_uhidrdetach(struct knote *); int filt_uhidread(struct knote *, long); int uhidkqfilter(dev_t, struct knote *); void filt_uhidrdetach(struct knote *kn) { struct uhid_softc *sc = (void *)kn->kn_hook; int s; s = splusb(); SLIST_REMOVE(&sc->sc_rsel.si_note, kn, knote, kn_selnext); splx(s); } int filt_uhidread(struct knote *kn, long hint) { struct uhid_softc *sc = (void *)kn->kn_hook; kn->kn_data = sc->sc_q.c_cc; return (kn->kn_data > 0); } struct filterops uhidread_filtops = { 1, NULL, filt_uhidrdetach, filt_uhidread }; struct filterops uhid_seltrue_filtops = { 1, NULL, filt_uhidrdetach, filt_seltrue }; int uhidkqfilter(dev_t dev, struct knote *kn) { struct uhid_softc *sc; struct klist *klist; int s; sc = uhid_cd.cd_devs[UHIDUNIT(dev)]; if (sc->sc_dying) return (EIO); switch (kn->kn_filter) { case EVFILT_READ: klist = &sc->sc_rsel.si_note; kn->kn_fop = &uhidread_filtops; break; case EVFILT_WRITE: klist = &sc->sc_rsel.si_note; kn->kn_fop = &uhid_seltrue_filtops; break; default: return (1); } kn->kn_hook = (void *)sc; s = splusb(); SLIST_INSERT_HEAD(klist, kn, kn_selnext); splx(s); return (0); }