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freebsd-dev/sys/dev/mse/mse.c
John Baldwin d0d8c133c7 Add locking and mark MPSAFE. 
- Add a mutex to protect the softc.
- Use callout(9) instead of timeout(9).
- Consolidate duplicated detach routines into a bus-independent detach
  routine.
- Add an extra sleep lock flag (MSESC_READING) to prevent other readers
  from reading while the first reader is copying data out of sc_bytes[]
  via uiomove().
- Use bus_*() instead of bus_space_*().

Tested by:	nyan
2014-10-11 19:36:59 +00:00

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/*-
* Copyright (c) 2004 M. Warner Losh
* 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.
*
* $FreeBSD$
*/
/*
* Copyright 1992 by the University of Guelph
*
* Permission to use, copy and modify this
* software and its documentation for any purpose and without
* fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting
* documentation.
* University of Guelph makes no representations about the suitability of
* this software for any purpose. It is provided "as is"
* without express or implied warranty.
*/
/*
* Driver for the Logitech and ATI Inport Bus mice for use with 386bsd and
* the X386 port, courtesy of
* Rick Macklem, rick@snowhite.cis.uoguelph.ca
* Caveats: The driver currently uses spltty(), but doesn't use any
* generic tty code. It could use splmse() (that only masks off the
* bus mouse interrupt, but that would require hacking in i386/isa/icu.s.
* (This may be worth the effort, since the Logitech generates 30/60
* interrupts/sec continuously while it is open.)
* NB: The ATI has NOT been tested yet!
*/
/*
* Modification history:
* Sep 6, 1994 -- Lars Fredriksen(fredriks@mcs.com)
* improved probe based on input from Logitech.
*
* Oct 19, 1992 -- E. Stark (stark@cs.sunysb.edu)
* fixes to make it work with Microsoft InPort busmouse
*
* Jan, 1993 -- E. Stark (stark@cs.sunysb.edu)
* added patches for new "select" interface
*
* May 4, 1993 -- E. Stark (stark@cs.sunysb.edu)
* changed position of some spl()'s in mseread
*
* October 8, 1993 -- E. Stark (stark@cs.sunysb.edu)
* limit maximum negative x/y value to -127 to work around XFree problem
* that causes spurious button pushes.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/poll.h>
#include <sys/selinfo.h>
#include <sys/uio.h>
#include <sys/mouse.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include <isa/isavar.h>
#include <dev/mse/msevar.h>
devclass_t mse_devclass;
static d_open_t mseopen;
static d_close_t mseclose;
static d_read_t mseread;
static d_ioctl_t mseioctl;
static d_poll_t msepoll;
static struct cdevsw mse_cdevsw = {
.d_version = D_VERSION,
.d_open = mseopen,
.d_close = mseclose,
.d_read = mseread,
.d_ioctl = mseioctl,
.d_poll = msepoll,
.d_name = "mse",
};
static void mseintr(void *);
static void mseintr_locked(mse_softc_t *sc);
static void msetimeout(void *);
#define MSE_NBLOCKIO(dev) (dev2unit(dev) != 0)
#define MSEPRI (PZERO + 3)
int
mse_common_attach(device_t dev)
{
mse_softc_t *sc;
int unit, flags, rid;
sc = device_get_softc(dev);
unit = device_get_unit(dev);
mtx_init(&sc->sc_lock, "mse", NULL, MTX_DEF);
callout_init_mtx(&sc->sc_callout, &sc->sc_lock, 0);
rid = 0;
sc->sc_intr = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
RF_ACTIVE);
if (sc->sc_intr == NULL) {
bus_release_resource(dev, SYS_RES_IOPORT, rid, sc->sc_port);
mtx_destroy(&sc->sc_lock);
return ENXIO;
}
if (bus_setup_intr(dev, sc->sc_intr, INTR_TYPE_TTY | INTR_MPSAFE,
NULL, mseintr, sc, &sc->sc_ih)) {
bus_release_resource(dev, SYS_RES_IOPORT, rid, sc->sc_port);
bus_release_resource(dev, SYS_RES_IRQ, rid, sc->sc_intr);
mtx_destroy(&sc->sc_lock);
return ENXIO;
}
flags = device_get_flags(dev);
sc->mode.accelfactor = (flags & MSE_CONFIG_ACCEL) >> 4;
sc->sc_dev = make_dev(&mse_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
"mse%d", unit);
sc->sc_dev->si_drv1 = sc;
sc->sc_ndev = make_dev(&mse_cdevsw, 1, UID_ROOT, GID_WHEEL, 0600,
"nmse%d", unit);
sc->sc_ndev->si_drv1 = sc;
return 0;
}
int
mse_detach(device_t dev)
{
mse_softc_t *sc;
int rid;
sc = device_get_softc(dev);
MSE_LOCK(sc);
if (sc->sc_flags & MSESC_OPEN) {
MSE_UNLOCK(sc);
return EBUSY;
}
/* Sabotage subsequent opens. */
sc->sc_mousetype = MSE_NONE;
MSE_UNLOCK(sc);
destroy_dev(sc->sc_dev);
destroy_dev(sc->sc_ndev);
rid = 0;
bus_teardown_intr(dev, sc->sc_intr, sc->sc_ih);
bus_release_resource(dev, SYS_RES_IRQ, rid, sc->sc_intr);
bus_release_resource(dev, SYS_RES_IOPORT, rid, sc->sc_port);
callout_drain(&sc->sc_callout);
mtx_destroy(&sc->sc_lock);
return 0;
}
/*
* Exclusive open the mouse, initialize it and enable interrupts.
*/
static int
mseopen(struct cdev *dev, int flags, int fmt, struct thread *td)
{
mse_softc_t *sc = dev->si_drv1;
MSE_LOCK(sc);
if (sc->sc_mousetype == MSE_NONE) {
MSE_UNLOCK(sc);
return (ENXIO);
}
if (sc->sc_flags & MSESC_OPEN) {
MSE_UNLOCK(sc);
return (EBUSY);
}
sc->sc_flags |= MSESC_OPEN;
sc->sc_obuttons = sc->sc_buttons = MOUSE_MSC_BUTTONS;
sc->sc_deltax = sc->sc_deltay = 0;
sc->sc_bytesread = sc->mode.packetsize = MOUSE_MSC_PACKETSIZE;
sc->sc_watchdog = FALSE;
callout_reset(&sc->sc_callout, hz * 2, msetimeout, dev);
sc->mode.level = 0;
sc->status.flags = 0;
sc->status.button = sc->status.obutton = 0;
sc->status.dx = sc->status.dy = sc->status.dz = 0;
/*
* Initialize mouse interface and enable interrupts.
*/
(*sc->sc_enablemouse)(sc->sc_port);
MSE_UNLOCK(sc);
return (0);
}
/*
* mseclose: just turn off mouse innterrupts.
*/
static int
mseclose(struct cdev *dev, int flags, int fmt, struct thread *td)
{
mse_softc_t *sc = dev->si_drv1;
MSE_LOCK(sc);
callout_stop(&sc->sc_callout);
(*sc->sc_disablemouse)(sc->sc_port);
sc->sc_flags &= ~MSESC_OPEN;
MSE_UNLOCK(sc);
return(0);
}
/*
* mseread: return mouse info using the MSC serial protocol, but without
* using bytes 4 and 5.
* (Yes this is cheesy, but it makes the X386 server happy, so...)
*/
static int
mseread(struct cdev *dev, struct uio *uio, int ioflag)
{
mse_softc_t *sc = dev->si_drv1;
int xfer, error;
/*
* If there are no protocol bytes to be read, set up a new protocol
* packet.
*/
MSE_LOCK(sc);
while (sc->sc_flags & MSESC_READING) {
if (MSE_NBLOCKIO(dev)) {
MSE_UNLOCK(sc);
return (0);
}
sc->sc_flags |= MSESC_WANT;
error = mtx_sleep(sc, &sc->sc_lock, MSEPRI | PCATCH, "mseread",
0);
if (error) {
MSE_UNLOCK(sc);
return (error);
}
}
sc->sc_flags |= MSESC_READING;
xfer = 0;
if (sc->sc_bytesread >= sc->mode.packetsize) {
while (sc->sc_deltax == 0 && sc->sc_deltay == 0 &&
(sc->sc_obuttons ^ sc->sc_buttons) == 0) {
if (MSE_NBLOCKIO(dev))
goto out;
sc->sc_flags |= MSESC_WANT;
error = mtx_sleep(sc, &sc->sc_lock, MSEPRI | PCATCH,
"mseread", 0);
if (error)
goto out;
}
/*
* Generate protocol bytes.
* For some reason X386 expects 5 bytes but never uses
* the fourth or fifth?
*/
sc->sc_bytes[0] = sc->mode.syncmask[1]
| (sc->sc_buttons & ~sc->mode.syncmask[0]);
if (sc->sc_deltax > 127)
sc->sc_deltax = 127;
if (sc->sc_deltax < -127)
sc->sc_deltax = -127;
sc->sc_deltay = -sc->sc_deltay; /* Otherwise mousey goes wrong way */
if (sc->sc_deltay > 127)
sc->sc_deltay = 127;
if (sc->sc_deltay < -127)
sc->sc_deltay = -127;
sc->sc_bytes[1] = sc->sc_deltax;
sc->sc_bytes[2] = sc->sc_deltay;
sc->sc_bytes[3] = sc->sc_bytes[4] = 0;
sc->sc_bytes[5] = sc->sc_bytes[6] = 0;
sc->sc_bytes[7] = MOUSE_SYS_EXTBUTTONS;
sc->sc_obuttons = sc->sc_buttons;
sc->sc_deltax = sc->sc_deltay = 0;
sc->sc_bytesread = 0;
}
xfer = min(uio->uio_resid, sc->mode.packetsize - sc->sc_bytesread);
MSE_UNLOCK(sc);
error = uiomove(&sc->sc_bytes[sc->sc_bytesread], xfer, uio);
MSE_LOCK(sc);
out:
sc->sc_flags &= ~MSESC_READING;
if (error == 0)
sc->sc_bytesread += xfer;
if (sc->sc_flags & MSESC_WANT) {
sc->sc_flags &= ~MSESC_WANT;
MSE_UNLOCK(sc);
wakeup(sc);
} else
MSE_UNLOCK(sc);
return (error);
}
/*
* mseioctl: process ioctl commands.
*/
static int
mseioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
{
mse_softc_t *sc = dev->si_drv1;
mousestatus_t status;
int err = 0;
switch (cmd) {
case MOUSE_GETHWINFO:
MSE_LOCK(sc);
*(mousehw_t *)addr = sc->hw;
if (sc->mode.level == 0)
((mousehw_t *)addr)->model = MOUSE_MODEL_GENERIC;
MSE_UNLOCK(sc);
break;
case MOUSE_GETMODE:
MSE_LOCK(sc);
*(mousemode_t *)addr = sc->mode;
switch (sc->mode.level) {
case 0:
break;
case 1:
((mousemode_t *)addr)->protocol = MOUSE_PROTO_SYSMOUSE;
((mousemode_t *)addr)->syncmask[0] = MOUSE_SYS_SYNCMASK;
((mousemode_t *)addr)->syncmask[1] = MOUSE_SYS_SYNC;
break;
}
MSE_UNLOCK(sc);
break;
case MOUSE_SETMODE:
switch (((mousemode_t *)addr)->level) {
case 0:
case 1:
break;
default:
return (EINVAL);
}
MSE_LOCK(sc);
if (((mousemode_t *)addr)->accelfactor < -1) {
MSE_UNLOCK(sc);
return (EINVAL);
} else if (((mousemode_t *)addr)->accelfactor >= 0)
sc->mode.accelfactor =
((mousemode_t *)addr)->accelfactor;
sc->mode.level = ((mousemode_t *)addr)->level;
switch (sc->mode.level) {
case 0:
sc->sc_bytesread = sc->mode.packetsize
= MOUSE_MSC_PACKETSIZE;
break;
case 1:
sc->sc_bytesread = sc->mode.packetsize
= MOUSE_SYS_PACKETSIZE;
break;
}
MSE_UNLOCK(sc);
break;
case MOUSE_GETLEVEL:
MSE_LOCK(sc);
*(int *)addr = sc->mode.level;
MSE_UNLOCK(sc);
break;
case MOUSE_SETLEVEL:
switch (*(int *)addr) {
case 0:
MSE_LOCK(sc);
sc->mode.level = *(int *)addr;
sc->sc_bytesread = sc->mode.packetsize
= MOUSE_MSC_PACKETSIZE;
MSE_UNLOCK(sc);
break;
case 1:
MSE_LOCK(sc);
sc->mode.level = *(int *)addr;
sc->sc_bytesread = sc->mode.packetsize
= MOUSE_SYS_PACKETSIZE;
MSE_UNLOCK(sc);
break;
default:
return (EINVAL);
}
break;
case MOUSE_GETSTATUS:
MSE_LOCK(sc);
status = sc->status;
sc->status.flags = 0;
sc->status.obutton = sc->status.button;
sc->status.button = 0;
sc->status.dx = 0;
sc->status.dy = 0;
sc->status.dz = 0;
MSE_UNLOCK(sc);
*(mousestatus_t *)addr = status;
break;
case MOUSE_READSTATE:
case MOUSE_READDATA:
return (ENODEV);
#if (defined(MOUSE_GETVARS))
case MOUSE_GETVARS:
case MOUSE_SETVARS:
return (ENODEV);
#endif
default:
return (ENOTTY);
}
return (err);
}
/*
* msepoll: check for mouse input to be processed.
*/
static int
msepoll(struct cdev *dev, int events, struct thread *td)
{
mse_softc_t *sc = dev->si_drv1;
int revents = 0;
MSE_LOCK(sc);
if (events & (POLLIN | POLLRDNORM)) {
if (sc->sc_bytesread != sc->mode.packetsize ||
sc->sc_deltax != 0 || sc->sc_deltay != 0 ||
(sc->sc_obuttons ^ sc->sc_buttons) != 0)
revents |= events & (POLLIN | POLLRDNORM);
else
selrecord(td, &sc->sc_selp);
}
MSE_UNLOCK(sc);
return (revents);
}
/*
* msetimeout: watchdog timer routine.
*/
static void
msetimeout(void *arg)
{
struct cdev *dev;
mse_softc_t *sc;
dev = (struct cdev *)arg;
sc = dev->si_drv1;
MSE_ASSERT_LOCKED(sc);
if (sc->sc_watchdog) {
if (bootverbose)
printf("%s: lost interrupt?\n", devtoname(dev));
mseintr_locked(sc);
}
sc->sc_watchdog = TRUE;
callout_schedule(&sc->sc_callout, hz);
}
/*
* mseintr: update mouse status. sc_deltax and sc_deltay are accumulative.
*/
static void
mseintr(void *arg)
{
mse_softc_t *sc = arg;
MSE_LOCK(sc);
mseintr_locked(sc);
MSE_UNLOCK(sc);
}
static void
mseintr_locked(mse_softc_t *sc)
{
/*
* the table to turn MouseSystem button bits (MOUSE_MSC_BUTTON?UP)
* into `mousestatus' button bits (MOUSE_BUTTON?DOWN).
*/
static int butmap[8] = {
0,
MOUSE_BUTTON3DOWN,
MOUSE_BUTTON2DOWN,
MOUSE_BUTTON2DOWN | MOUSE_BUTTON3DOWN,
MOUSE_BUTTON1DOWN,
MOUSE_BUTTON1DOWN | MOUSE_BUTTON3DOWN,
MOUSE_BUTTON1DOWN | MOUSE_BUTTON2DOWN,
MOUSE_BUTTON1DOWN | MOUSE_BUTTON2DOWN | MOUSE_BUTTON3DOWN
};
int dx, dy, but;
int sign;
#ifdef DEBUG
static int mse_intrcnt = 0;
if((mse_intrcnt++ % 10000) == 0)
printf("mseintr\n");
#endif /* DEBUG */
if ((sc->sc_flags & MSESC_OPEN) == 0)
return;
(*sc->sc_getmouse)(sc->sc_port, &dx, &dy, &but);
if (sc->mode.accelfactor > 0) {
sign = (dx < 0);
dx = dx * dx / sc->mode.accelfactor;
if (dx == 0)
dx = 1;
if (sign)
dx = -dx;
sign = (dy < 0);
dy = dy * dy / sc->mode.accelfactor;
if (dy == 0)
dy = 1;
if (sign)
dy = -dy;
}
sc->sc_deltax += dx;
sc->sc_deltay += dy;
sc->sc_buttons = but;
but = butmap[~but & MOUSE_MSC_BUTTONS];
sc->status.dx += dx;
sc->status.dy += dy;
sc->status.flags |= ((dx || dy) ? MOUSE_POSCHANGED : 0)
| (sc->status.button ^ but);
sc->status.button = but;
sc->sc_watchdog = FALSE;
/*
* If mouse state has changed, wake up anyone wanting to know.
*/
if (sc->sc_deltax != 0 || sc->sc_deltay != 0 ||
(sc->sc_obuttons ^ sc->sc_buttons) != 0) {
if (sc->sc_flags & MSESC_WANT) {
sc->sc_flags &= ~MSESC_WANT;
wakeup(sc);
}
selwakeuppri(&sc->sc_selp, MSEPRI);
}
}
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