File: [local] / sys / dev / usb / uhid.c (download)
Revision 1.1, Tue Mar 4 16:14:26 2008 UTC (16 years, 6 months ago) by nbrk
Branch point for: MAIN
Initial revision
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/* $OpenBSD: uhid.c,v 1.41 2007/06/14 10:11:15 mbalmer 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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 <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/signalvar.h>
#include <sys/device.h>
#include <sys/ioctl.h>
#include <sys/conf.h>
#include <sys/tty.h>
#include <sys/file.h>
#include <sys/selinfo.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/poll.h>
#include <dev/usb/usb.h>
#include <dev/usb/usbhid.h>
#include <dev/usb/usbdevs.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usbdi_util.h>
#include <dev/usb/hid.h>
#include <dev/usb/usb_quirks.h>
#include <dev/usb/uhidev.h>
#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;
int sc_isize;
int sc_osize;
int sc_fsize;
u_char *sc_obuf;
struct clist sc_q;
struct selinfo sc_rsel;
struct proc *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 *, enum devact);
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_isize = hid_report_size(desc, size, hid_input, repid);
sc->sc_osize = hid_report_size(desc, size, hid_output, repid);
sc->sc_fsize = hid_report_size(desc, size, hid_feature, repid);
printf(": input=%d, output=%d, feature=%d\n",
sc->sc_isize, sc->sc_osize, sc->sc_fsize);
}
int
uhid_activate(struct device *self, enum devact 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));
psignal(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);
if (clalloc(&sc->sc_q, UHID_BSIZE, 0) == -1) {
uhidev_close(&sc->sc_hdev);
return (ENOMEM);
}
sc->sc_obuf = malloc(sc->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_isize + extra);
if (err)
return (EIO);
return (uiomove(buffer+extra, sc->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_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)
{
struct usb_ctl_report_desc *rd;
struct usb_ctl_report *re;
u_char buffer[UHID_CHUNK];
int size, extra;
usbd_status err;
void *desc;
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;
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->p_pgid)
return (EPERM);
break;
case USB_GET_REPORT_DESC:
uhidev_get_report_desc(sc->sc_hdev.sc_parent, &desc, &size);
rd = (struct usb_ctl_report_desc *)addr;
size = min(size, sizeof rd->ucrd_data);
rd->ucrd_size = size;
memcpy(rd->ucrd_data, desc, size);
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_isize + extra);
if (err)
return (EOPNOTSUPP);
sc->sc_state |= UHID_IMMED;
} else
sc->sc_state &= ~UHID_IMMED;
break;
case USB_GET_REPORT:
re = (struct usb_ctl_report *)addr;
switch (re->ucr_report) {
case UHID_INPUT_REPORT:
size = sc->sc_isize;
break;
case UHID_OUTPUT_REPORT:
size = sc->sc_osize;
break;
case UHID_FEATURE_REPORT:
size = sc->sc_fsize;
break;
default:
return (EINVAL);
}
extra = sc->sc_hdev.sc_report_id != 0;
err = uhidev_get_report(&sc->sc_hdev, re->ucr_report,
re->ucr_data, size + extra);
if (extra)
memcpy(re->ucr_data, re->ucr_data+1, size);
if (err)
return (EIO);
break;
case USB_SET_REPORT:
re = (struct usb_ctl_report *)addr;
switch (re->ucr_report) {
case UHID_INPUT_REPORT:
size = sc->sc_isize;
break;
case UHID_OUTPUT_REPORT:
size = sc->sc_osize;
break;
case UHID_FEATURE_REPORT:
size = sc->sc_fsize;
break;
default:
return (EINVAL);
}
err = uhidev_set_report(&sc->sc_hdev, re->ucr_report,
re->ucr_data, size);
if (err)
return (EIO);
break;
case USB_GET_REPORT_ID:
*(int *)addr = sc->sc_hdev.sc_report_id;
break;
default:
return (EINVAL);
}
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);
}