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freebsd-dev/sys/i386/isa/psm.c
Søren Schmidt 1f9d9075e4 Alot of fixes from kazu: 
1. All the suggestions earlier made by Bruce: renaming some symbols,
stricter error checking, removing redundant code, etc.

2. The `psm' driver preserves the default counter resolution and
report rate, whatever they are after reset. (Based on reports and
suggestion from Nate and Rob Bolin).

3. The `psm' driver now does not check the so-called sync. bit in the
first byte of the data packet by default, so that the tapping feature
of ALPUS GlidePoint works (based on reports from Louis Mamakos). I
tested the code with ALPUS Desktop GlidePoint (M/N GP101) and found
no problem; tapping worked. It appears ALPUS produces several models
of GlidePoint. I hope the other models are OK too.

The check code can still be activated by defining the PSM_CHECKSYNC
option in the config file. (The bit checking slightly reduces, if not
completely eliminates, weird mouse behavior cased by unsynchronized
mouse data packets. It also helps us to detect if the mouse interrupt
can ever be lost. But, well, if there are devices which cannot be
supported this way...)

4. The `psm' driver does not include the protocol emulation code by
default. The code can still be compiled in if the PSM_EMULATION option
is specified in the config file. Louis Mamakos suggests the emulation
code is putting too much in the kernel, and `moused' works well.
I will think about this later and decide if the entire emulation
code should be removed.

5. And, of course, the fix in `scprobe()' from Bruce to cure the
UserConfig problem. My code in `kbdio.c' is slightly different from
his patch, but has the same effect. There still is a possibility that
`scprobe()' gets confused, if, for whatever reasons, the user holds
down a key for very long time during the boot process. But we cannot
cope with everything, can we?

Submitted by:	Kazutaka YOKOTA (yokota@zodiac.mech.utsunomiya-u.ac.jp)
1996-12-01 19:05:50 +00:00

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/*-
* Copyright (c) 1992, 1993 Erik Forsberg.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY ``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 I 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.
*
* $Id: psm.c,v 1.31 1996/11/28 17:18:56 phk Exp $
*/
/*
* Ported to 386bsd Oct 17, 1992
* Sandi Donno, Computer Science, University of Cape Town, South Africa
* Please send bug reports to sandi@cs.uct.ac.za
*
* Thanks are also due to Rick Macklem, rick@snowhite.cis.uoguelph.ca -
* although I was only partially successful in getting the alpha release
* of his "driver for the Logitech and ATI Inport Bus mice for use with
* 386bsd and the X386 port" to work with my Microsoft mouse, I nevertheless
* found his code to be an invaluable reference when porting this driver
* to 386bsd.
*
* Further modifications for latest 386BSD+patchkit and port to NetBSD,
* Andrew Herbert <andrew@werple.apana.org.au> - 8 June 1993
*
* Cloned from the Microsoft Bus Mouse driver, also by Erik Forsberg, by
* Andrew Herbert - 12 June 1993
*
* Modified for PS/2 mouse by Charles Hannum <mycroft@ai.mit.edu>
* - 13 June 1993
*
* Modified for PS/2 AUX mouse by Shoji Yuen <yuen@nuie.nagoya-u.ac.jp>
* - 24 October 1993
*
* Hardware access routines and probe logic rewritten by
* Kazutaka Yokota <yokota@zodiac.mech.utsunomiya-u.ac.jp>
* - 3 October 1996.
* - 14 October 1996.
* - 22 October 1996.
* - 12 November 1996. IOCTLs and rearranging `psmread', `psmioctl'...
* - 14 November 1996. Uses `kbdio.c'.
* - 30 November 1996. More fixes.
*/
#include "psm.h"
#if NPSM > 0
#include <limits.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/file.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <sys/syslog.h>
#include <sys/malloc.h>
#ifdef DEVFS
#include <sys/devfsext.h>
#endif
#include <i386/include/mouse.h>
#include <i386/include/clock.h>
#include <i386/isa/isa.h>
#include <i386/isa/isa_device.h>
#include <i386/isa/kbdio.h>
/*
* driver specific options: the following options may be set by
* `options' statements in the kernel configuration file.
*/
/* debugging */
#ifndef PSM_DEBUG
#define PSM_DEBUG 0 /* logging: 0: none, 1: brief, 2: verbose */
#endif
/* #define PSM_CHECKSYNC if defined, check the header data byte */
/* features */
#ifndef PSM_ACCEL
#define PSM_ACCEL 0 /* must be one or greater; acceleration will be
* disabled if zero */
#endif
/* #define PSM_EMULATION enables protocol emulation */
/* end of driver specific options */
/* default values */
#define PSMD_DEFAULT_RESOLUTION 200 /* resolution: 200 ppi */
#define PSMD_DEFAULT_RATE 100 /* report rate: 100 Hz */
/* some macros */
#define PSM_UNIT(dev) (minor(dev) >> 1)
#define PSM_NBLOCKIO(dev) (minor(dev) & 1)
#define PSM_MKMINOR(unit,block) (((unit) << 1) | ((block) ? 0:1))
#ifndef max
#define max(x,y) ((x) > (y) ? (x) : (y))
#endif
#ifndef min
#define min(x,y) ((x) < (y) ? (x) : (y))
#endif
/* ring buffer */
#define PSM_BUFSIZE 256
typedef struct ringbuf {
int count;
int head;
int tail;
mousestatus_t buf[PSM_BUFSIZE];
} ringbuf_t;
/* driver control block */
typedef int (*packetfunc_t) __P((unsigned char *, int *, int, mousestatus_t *));
static struct psm_softc { /* Driver status information */
struct selinfo rsel; /* Process selecting for Input */
unsigned char state; /* Mouse driver state */
int addr; /* I/O port address */
int command_byte; /* controller command byte */
mousehw_t hw; /* hardware information */
mousemode_t mode; /* operation mode */
ringbuf_t queue; /* mouse status queue */
packetfunc_t mkpacket; /* func. to turn queued data into output format */
char ipacket[MOUSE_PS2_PACKETSIZE]; /* interim input buffer */
unsigned char opacket[PSM_BUFSIZE]; /* output buffer */
int inputbytes; /* # of bytes in the input buffer */
int outputbytes; /* # of bytes in the output buffer */
int outputhead; /* points the head of the output buffer */
int button; /* the latest button state */
#ifdef DEVFS
void *devfs_token;
void *n_devfs_token;
#endif
} *psm_softc[NPSM];
/* driver state flags (state) */
#define PSM_VALID 0x80
#define PSM_OPEN 1 /* Device is open */
#define PSM_ASLP 2 /* Waiting for mouse data */
/* function prototypes */
static int psmprobe __P((struct isa_device *));
static int psmattach __P((struct isa_device *));
static int mkms __P((unsigned char *, int *, int, mousestatus_t *));
static int mkman __P((unsigned char *, int *, int, mousestatus_t *));
static int mkmsc __P((unsigned char *, int *, int, mousestatus_t *));
static int mkmm __P((unsigned char *, int *, int, mousestatus_t *));
static int mkps2 __P((unsigned char *, int *, int, mousestatus_t *));
static d_open_t psmopen;
static d_close_t psmclose;
static d_read_t psmread;
static d_ioctl_t psmioctl;
static d_select_t psmselect;
/* device driver declarateion */
struct isa_driver psmdriver = { psmprobe, psmattach, "psm", FALSE };
#define CDEV_MAJOR 21
static struct cdevsw psm_cdevsw = {
psmopen, psmclose, psmread, nowrite, /* 21 */
psmioctl, nostop, nullreset, nodevtotty,
psmselect, nommap, NULL, "psm", NULL, -1
};
/* debug message level */
static int verbose = PSM_DEBUG;
/* device I/O routines */
static int
enable_aux_dev(int port)
{
int res;
res = send_aux_command(port, PSMC_ENABLE_DEV);
if (verbose >= 2)
log(LOG_DEBUG, "psm: ENABLE_DEV return code:%04x\n", res);
return (res == PSM_ACK);
}
static int
disable_aux_dev(int port)
{
int res;
res = send_aux_command(port, PSMC_DISABLE_DEV);
if (verbose >= 2)
log(LOG_DEBUG, "psm: DISABLE_DEV return code:%04x\n", res);
return (res == PSM_ACK);
}
static int
get_mouse_status(int port, int *status)
{
int res;
empty_both_buffers(port, 2);
res = send_aux_command(port, PSMC_SEND_DEV_STATUS);
if (verbose >= 2)
log(LOG_DEBUG, "psm: SEND_AUX_STATUS return code:%04x\n", res);
if (res != PSM_ACK)
return FALSE;
status[0] = read_aux_data(port);
status[1] = read_aux_data(port);
status[2] = read_aux_data(port);
return TRUE;
}
static int
get_aux_id(int port)
{
int res;
int id;
empty_both_buffers(port, 2);
res = send_aux_command(port, PSMC_SEND_DEV_ID);
if (verbose >= 2)
log(LOG_DEBUG, "psm: SEND_DEV_ID return code:%04x\n", res);
if (res != PSM_ACK)
return (-1);
/* 10ms delay */
DELAY(10000);
id = read_aux_data(port);
if (verbose >= 2)
log(LOG_DEBUG, "psm: device ID: %04x\n", id);
return id;
}
static int
set_mouse_sampling_rate(int port, int rate)
{
int res;
res = send_aux_command_and_data(port, PSMC_SET_SAMPLING_RATE, rate);
if (verbose >= 2)
log(LOG_DEBUG, "psm: SET_SAMPLING_RATE (%d) %04x\n", rate, res);
return ((res == PSM_ACK) ? rate : -1);
}
static int
set_mouse_scaling(int port)
{
int res;
res = send_aux_command(port, PSMC_SET_SCALING11);
if (verbose >= 2)
log(LOG_DEBUG, "psm: SET_SCALING11 return code:%04x\n", res);
return (res == PSM_ACK);
}
static struct {
int resolution;
int code;
} rescode[] = {
{ 25, PSMD_RESOLUTION_25 },
{ 50, PSMD_RESOLUTION_50 },
{ 100, PSMD_RESOLUTION_100 },
{ 200, PSMD_RESOLUTION_200 },
{ 400, PSMD_RESOLUTION_400 }, /* ?? */
{ 800, PSMD_RESOLUTION_800 }, /* ?? */
{ INT_MAX, PSMD_MAX_RESOLUTION },
{ -1 },
};
static int
set_mouse_resolution(int port, int res)
{
int ret;
int i;
if (res <= 0)
return (-1);
for (i = 0; rescode[i].resolution > 0; ++i)
if (rescode[i].resolution >= res)
break;
for (; i >= 0; --i) {
ret = send_aux_command_and_data(port,
PSMC_SET_RESOLUTION, rescode[i].code);
if (verbose >= 2)
log(LOG_DEBUG, "psm: SET_RESOLUTION (%d) %04x\n",
rescode[i].code, ret);
if (ret == PSM_ACK)
return rescode[i].resolution;
}
return (-1);
}
/*
* NOTE: once `set_mouse_mode()' is called, the mouse device must be
* re-enabled by calling `enable_aux_dev()'
*/
static int
set_mouse_mode(int port)
{
int res;
res = send_aux_command(port, PSMC_SET_STREAM_MODE);
if (verbose >= 2)
log(LOG_DEBUG, "psm: SET_STREAM_MODE return code:%04x\n", res);
return (res == PSM_ACK);
}
static int
get_mouse_buttons(int port)
{
int c = 2; /* assume two buttons by default */
int res;
int status[3];
/*
* NOTE: a special sequence to obtain Logitech-Mouse-specific
* information: set resolution to 25 ppi, set scaling to 1:1, set
* scaling to 1:1, set scaling to 1:1. Then the second byte of the
* mouse status bytes is the number of available buttons.
*/
if (set_mouse_resolution(port, 25) != 25)
return c;
if (set_mouse_scaling(port) && set_mouse_scaling(port)
&& set_mouse_scaling(port) && get_mouse_status(port, status)) {
if (verbose) {
log(LOG_DEBUG, "psm: status %02x %02x %02x (get_mouse_buttons)\n",
status[0], status[1], status[2]);
}
if (status[1] == 3)
return 3;
}
return c;
}
/*
* FIXME:XXX
* someday, I will get the list of valid pointing devices and
* their IDs...
*/
static int
is_a_mouse(int id)
{
static int valid_ids[] = {
PSM_MOUSE_ID, /* mouse */
PSM_BALLPOINT_ID, /* ballpoint device */
-1 /* end of table */
};
#if 0
int i;
for(i = 0; valid_ids[i] >= 0; ++i)
if (valid_ids[i] == id)
return TRUE;
return FALSE;
#else
return TRUE;
#endif
}
static void
recover_from_error(int port)
{
/* discard anything left in the output buffer */
empty_both_buffers(port, 10);
#if 0
/*
* NOTE: KBDC_RESET_KBD may not restore the communication between the
* keyboard and the controller.
*/
reset_kbd(port);
#else
/*
* NOTE: somehow diagnostic and keyboard port test commands bring the
* keyboard back.
*/
if (!test_controller(port))
log(LOG_ERR, "psm: keyboard controller failed.\n");
/* if there isn't a keyboard in the system, the following error is OK */
if (test_kbd_port(port) != 0) {
if (verbose)
log(LOG_ERR, "psm: keyboard port failed.\n");
}
#endif
}
static int
restore_controller(int port, int command_byte)
{
if (!set_controller_command_byte(port, command_byte, 0)) {
log(LOG_ERR, "psm: failed to restore the keyboard controller "
"command byte.\n");
return FALSE;
} else {
return TRUE;
}
}
/*
* Re-initialize the aux port and device. The aux port must be enabled
* and its interrupt must be disabled before calling this routine.
* The aux device will be disabled before returning.
*/
static int
reinitialize(dev_t dev, mousemode_t *mode)
{
int port = psm_softc[PSM_UNIT(dev)]->addr;
int stat[3];
int i;
switch((i = test_aux_port(port))) {
case 0: /* no error */
break;
case -1: /* time out */
default: /* error */
recover_from_error(port);
log(LOG_ERR, "psm%d: the aux port is not functioning (%d).\n",
PSM_UNIT(dev),i);
return FALSE;
}
/*
* NOTE: some controllers appears to hang the `keyboard' when
* the aux port doesn't exist and `PSMC_RESET_DEV' is issued.
*/
if (!reset_aux_dev(port)) {
recover_from_error(port);
log(LOG_ERR, "psm%d: failed to reset the aux device.\n",
PSM_UNIT(dev));
return FALSE;
}
/*
* both the aux port and the aux device is functioning, see
* if the device can be enabled.
*/
if (!enable_aux_dev(port) || !disable_aux_dev(port)) {
log(LOG_ERR, "psm%d: failed to enable the aux device.\n",
PSM_UNIT(dev));
return FALSE;
}
empty_both_buffers(port, 10);
/* set mouse parameters */
if (mode != (mousemode_t *)NULL) {
if (mode->rate > 0)
mode->rate = set_mouse_sampling_rate(port, mode->rate);
if (mode->resolution > 0)
mode->resolution = set_mouse_resolution(port, mode->resolution);
set_mouse_scaling(port);
set_mouse_mode(port);
}
/* just check the status of the mouse */
if (verbose) {
get_mouse_status(port, stat);
log(LOG_DEBUG, "psm%d: status %02x %02x %02x (reinitialized)\n",
PSM_UNIT(dev), stat[0], stat[1], stat[2]);
}
return TRUE;
}
/* psm driver entry points */
#define endprobe(v) { if (bootverbose) \
--verbose; \
return (v); \
}
static int
psmprobe(struct isa_device *dvp)
{
int unit = dvp->id_unit;
int ioport = dvp->id_iobase;
struct psm_softc *sc;
int stat[3];
int setparams;
int i;
/* validate unit number */
if (unit >= NPSM)
return (0);
sc = malloc(sizeof *sc, M_DEVBUF, M_NOWAIT);
bzero(sc, sizeof *sc);
sc->addr = ioport;
if (bootverbose)
++verbose;
/*
* FIXME:XXX
* the keyboard interrupt should be disabled while probing a
* mouse?
*/
/*
* NOTE: two bits in the command byte controls the operation of the
* aux port (mouse port): the aux port disable bit (bit 5) and the aux
* port interrupt (IRQ 12) enable bit (bit 2). When this probe routine
* is called, there are following possibilities about the presence of
* the aux port and the PS/2 mouse.
*
* Case 1: aux port disabled (bit 5:1), aux int. disabled (bit 2:0) The
* aux port most certainly exists. A device may or may not be
* connected to the port. No driver is probably installed yet.
*
* Case 2: aux port enabled (bit 5:0), aux int. disabled (bit 2:0) Three
* possibile situations here:
*
* Case 2a: The aux port does not exist, therefore, is not explicitly
* disabled. Case 2b: The aux port exists. A device and a driver may
* exist, using the device in the polling(remote) mode. Case 2c: The
* aux port exists. A device may exist, but someone who knows nothing
* about the aux port has set the command byte this way (this is the
* case with `syscons').
*
* Case 3: aux port disabled (bit 5:1), aux int. enabled (bit 2:1) The
* aux port exists, but someone is controlloing the device and
* temporalily disabled the port.
*
* Case 4: aux port enabled (bit 5:0), aux int. enabled (bit 2:1) The aux
* port exists, a device is attached to the port, and someone is
* controlling the device. Some BIOS set the bits this way after boot.
*
* All in all, it is no use examing the bits for detecting the presence
* of the port and the mouse device.
*/
/* save the current command byte; it will be used later */
if (!write_controller_command(ioport,KBDC_GET_COMMAND_BYTE)) {
/* CONTROLLER ERROR */
printf("psm%d: failed to get the current command byte value.\n",
unit);
free(sc, M_DEVBUF);
endprobe(0);
}
sc->command_byte = read_controller_data(ioport);
if (verbose) {
printf("psm%d: current command byte:%04x\n",
unit, sc->command_byte);
}
if (sc->command_byte == -1) {
/* CONTROLLER ERROR */
printf("psm%d: unable to get the current command byte value.\n",
unit);
free(sc, M_DEVBUF);
endprobe(0);
}
/*
* disable the keyboard port while probing the aux port, which must be
* enabled during this routine
*/
if (!set_controller_command_byte(ioport,
sc->command_byte & ~(KBD_KBD_CONTROL_BITS | KBD_AUX_CONTROL_BITS),
KBD_DISABLE_KBD_PORT | KBD_DISABLE_KBD_INT
| KBD_ENABLE_AUX_PORT | KBD_DISABLE_AUX_INT)) {
/*
* this is CONTROLLER ERROR; I don't know how to recover
* from this error...
*/
restore_controller(ioport, sc->command_byte);
printf("psm%d: unable to set the command byte.\n", unit);
free(sc, M_DEVBUF);
endprobe(0);
}
/*
* NOTE: `test_aux_port()' is designed to return with zero if the aux
* port exists and is functioning. However, some controllers appears
* to respond with zero even when the aux port doesn't exist. (It may
* be that this is only the case when the controller DOES have the aux
* port but the port is not wired on the motherboard.) The keyboard
* controllers without the port, such as the original AT, are
* supporsed to return with an error code or simply time out. In any
* case, we have to continue probing the port even when the controller
* passes this test.
*/
switch ((i = test_aux_port(ioport))) {
case 0: /* no error */
break;
case -1: /* time out */
default: /* error */
recover_from_error(ioport);
restore_controller(ioport, sc->command_byte);
if (verbose)
printf("psm%d: the aux port is not functioning (%d).\n",
unit, i);
free(sc, M_DEVBUF);
endprobe(0);
}
/*
* NOTE: some controllers appears to hang the `keyboard' when the aux
* port doesn't exist and `PSMC_RESET_DEV' is issued.
*/
if (!reset_aux_dev(ioport)) {
recover_from_error(ioport);
restore_controller(ioport, sc->command_byte);
if (verbose)
printf("psm%d: failed to reset the aux device.\n", unit);
free(sc, M_DEVBUF);
endprobe(0);
}
/*
* both the aux port and the aux device is functioning, see if the
* device can be enabled. NOTE: when enabled, the device will start
* sending data; we shall immediately disable the device once we know
* the device can be enabled.
*/
if (!enable_aux_dev(ioport) || !disable_aux_dev(ioport)) {
/* MOUSE ERROR */
restore_controller(ioport, sc->command_byte);
if (verbose)
printf("psm%d: failed to enable the aux device.\n", unit);
free(sc, M_DEVBUF);
endprobe(0);
}
empty_both_buffers(ioport, 10); /* remove stray data if any */
/* save the default values after reset */
if (get_mouse_status(ioport, stat)) {
if (verbose)
printf("psm%d: status after reset %02x %02x %02x\n",
unit, stat[0], stat[1], stat[2]);
sc->mode.rate = stat[2];
sc->mode.resolution = PSMD_DEFAULT_RESOLUTION;
for (i = 0; rescode[i].resolution > 0; ++i)
if (rescode[i].code == stat[1])
sc->mode.resolution = rescode[i].resolution;
setparams = TRUE;
} else {
sc->mode.rate = -1;
sc->mode.resolution = -1;
setparams = FALSE;
}
/* hardware information */
sc->hw.iftype = MOUSE_IF_PS2;
/* verify the device is a mouse */
sc->hw.hwid = get_aux_id(ioport);
if (!is_a_mouse(sc->hw.hwid)) {
restore_controller(ioport, sc->command_byte);
if (verbose)
printf("psm%d: unknown device type (%d).\n", unit, sc->hw.hwid);
free(sc, M_DEVBUF);
endprobe(0);
}
switch (sc->hw.hwid) {
case PSM_BALLPOINT_ID:
sc->hw.type = MOUSE_TRACKBALL;
break;
case PSM_MOUSE_ID:
sc->hw.type = MOUSE_MOUSE;
break;
default:
sc->hw.type = MOUSE_UNKNOWN;
break;
}
/* # of buttons */
sc->hw.buttons = (setparams) ? get_mouse_buttons(ioport) : 2;
/* set mouse parameters */
/* FIXME:XXX should we set them in `psmattach()' rather than here? */
if (setparams) {
if (sc->mode.rate > 0)
sc->mode.rate = set_mouse_sampling_rate(ioport, sc->mode.rate);
if (sc->mode.resolution > 0)
sc->mode.resolution =
set_mouse_resolution(ioport, sc->mode.resolution);
}
/* FIXME:XXX I don't know if these parameters are reasonable */
set_mouse_scaling(ioport); /* 1:1 scaling */
set_mouse_mode(ioport); /* stream mode */
/* just check the status of the mouse */
if (verbose) {
get_mouse_status(ioport, stat);
log(LOG_DEBUG, "psm%d: status %02x %02x %02x\n",
unit, stat[0], stat[1], stat[2]);
}
/* disable the aux port for now... */
/*
* WARNING: we save the controller command byte and use it later
* during `psmopen()' and `psmclose()'. This will be OK, so long as
* the keyboard/console device driver won't change the command byte in
* the course of its operation (this is the case with `syscons'). If
* not,...
*/
if (!set_controller_command_byte(ioport,
sc->command_byte & ~KBD_AUX_CONTROL_BITS,
KBD_DISABLE_AUX_PORT | KBD_DISABLE_AUX_INT)) {
/*
* this is CONTROLLER ERROR; I don't know the proper way to
* recover from this error...
*/
restore_controller(ioport, sc->command_byte);
printf("psm%d: unable to set the command byte.\n", unit);
free(sc, M_DEVBUF);
endprobe(0);
}
sc->command_byte &= ~KBD_AUX_CONTROL_BITS;
/* done */
psm_softc[unit] = sc;
return (IO_PSMSIZE);
}
static int
psmattach(struct isa_device *dvp)
{
int unit = dvp->id_unit;
struct psm_softc *sc = psm_softc[unit];
/* initial operation mode */
sc->mode.accelfactor = PSM_ACCEL;
sc->mode.protocol = MOUSE_PROTO_PS2;
sc->mkpacket = mkps2;
/* Setup initial state */
sc->state = PSM_VALID;
/* Done */
#ifdef DEVFS
sc->devfs_token =
devfs_add_devswf(&psm_cdevsw, PSM_MKMINOR(unit, TRUE),
DV_CHR, 0, 0, 0666, "psm%d", unit);
sc->n_devfs_token =
devfs_add_devswf(&psm_cdevsw, PSM_MKMINOR(unit, FALSE),
DV_CHR, 0, 0, 0666, "npsm%d", unit);
#endif
printf("psm%d: device ID %d, %d buttons?\n",
unit, sc->hw.hwid, sc->hw.buttons);
if (bootverbose)
--verbose;
return (1);
}
static int
psmopen(dev_t dev, int flag, int fmt, struct proc *p)
{
int unit = PSM_UNIT(dev);
int ioport;
struct psm_softc *sc;
int stat[3];
/* Validate unit number */
if (unit >= NPSM)
return (ENXIO);
/* Get device data */
sc = psm_softc[unit];
if ((sc->state & PSM_VALID) == 0)
/* the device is no longer valid/functioning */
return (ENXIO);
ioport = sc->addr;
/* Disallow multiple opens */
if (sc->state & PSM_OPEN)
return (EBUSY);
/* Initialize state */
sc->rsel.si_flags = 0;
sc->rsel.si_pid = 0;
/* flush the event queue */
sc->queue.count = 0;
sc->queue.head = 0;
sc->queue.tail = 0;
sc->button = 0;
/* empty input/output buffers */
sc->inputbytes = 0;
sc->outputbytes = 0;
sc->outputhead = 0;
/* enable the aux port and temporalily disable the keyboard */
if (!set_controller_command_byte(ioport,
sc->command_byte & ~KBD_KBD_CONTROL_BITS,
KBD_DISABLE_KBD_PORT | KBD_DISABLE_KBD_INT
| KBD_ENABLE_AUX_PORT | KBD_DISABLE_AUX_INT)) {
/* CONTROLLER ERROR; do you know how to get out of this? */
set_controller_command_byte(ioport,
sc->command_byte, KBD_DISABLE_AUX_PORT | KBD_DISABLE_AUX_INT);
log(LOG_ERR, "psm%d: unable to set the command byte (psmopen).\n",
unit);
return (EIO);
}
/* enable the mouse device */
if (!enable_aux_dev(ioport)) {
/* MOUSE ERROR: failed to enable the mouse because:
* 1) the mouse is faulty,
* 2) the mouse has been removed(!?)
* In the latter case, the keyboard may have hung, and need
* recovery procedure...
*/
recover_from_error(ioport);
#if 0
/* FIXME: we could reset the mouse here and try to enable
* it again. But it will take long time and it's not a good
* idea to disable the keyboard that long...
*/
if (!reinitialize(dev, &sc->mode) || !enable_aux_dev(ioport))
recover_from_error(ioport);
#endif
set_controller_command_byte(ioport,
sc->command_byte, KBD_DISABLE_AUX_PORT | KBD_DISABLE_AUX_INT);
/* mark this device is no longer available */
sc->state &= ~PSM_VALID;
log(LOG_ERR, "psm%d: failed to enable the device (psmopen).\n",
unit);
return (EIO);
}
if (verbose >= 2) {
get_mouse_status(ioport, stat);
log(LOG_DEBUG, "psm%d: status %02x %02x %02x\n",
unit, stat[0], stat[1], stat[2]);
}
/* enable the aux port and interrupt */
if (!set_controller_command_byte(ioport, sc->command_byte,
KBD_ENABLE_AUX_PORT | KBD_ENABLE_AUX_INT)) {
/* CONTROLLER ERROR */
disable_aux_dev(ioport);
set_controller_command_byte(ioport, sc->command_byte,
KBD_DISABLE_AUX_PORT | KBD_DISABLE_AUX_INT);
log(LOG_ERR, "psm%d: failed to enable the aux interrupt (psmopen).\n",
unit);
return (EIO);
}
/* done */
sc->state |= PSM_OPEN;
return (0);
}
static int
psmclose(dev_t dev, int flag, int fmt, struct proc *p)
{
struct psm_softc *sc = psm_softc[PSM_UNIT(dev)];
int ioport = sc->addr;
/* disable the aux interrupt */
if (!set_controller_command_byte(ioport, sc->command_byte,
KBD_ENABLE_AUX_PORT | KBD_DISABLE_AUX_INT)) {
log(LOG_ERR, "psm%d: failed to disable the aux int (psmclose).\n",
PSM_UNIT(dev));
/* CONTROLLER ERROR;
* NOTE: we shall force our way through. Because the only
* ill effect we shall see is that we may not be able
* to read ACK from the mouse, and it doesn't matter much
* so long as the mouse will accept the DISABLE command.
*/
}
/* remove anything left in the output buffer */
empty_aux_buffer(ioport, 20);
/* disable the aux device, port and interrupt */
if (!disable_aux_dev(ioport)) {
/* MOUSE ERROR;
* NOTE: we don't return error and continue, pretending
* we have successfully disabled the device. It's OK because
* the interrupt routine will discard any data from the mouse
* hereafter.
*/
log(LOG_ERR, "psm%d: failed to disable the device (psmclose).\n",
PSM_UNIT(dev));
}
if (!set_controller_command_byte(ioport, sc->command_byte,
KBD_DISABLE_AUX_PORT | KBD_DISABLE_AUX_INT)) {
/* CONTROLLER ERROR;
* we shall ignore this error; see the above comment.
*/
log(LOG_ERR, "psm%d: failed to disable the aux port (psmclose).\n",
PSM_UNIT(dev));
}
/* remove anything left in the output buffer */
empty_aux_buffer(ioport, 10);
/* close is almost always successful */
sc->state &= ~PSM_OPEN;
return (0);
}
#ifdef PSM_EMULATION
static int
mkms(unsigned char *buf, int *len, int maxlen, register mousestatus_t *status)
{
static int butmap[] = {
0, MOUSE_MSS_BUTTON1DOWN,
0, MOUSE_MSS_BUTTON1DOWN ,
MOUSE_MSS_BUTTON3DOWN, MOUSE_MSS_BUTTON1DOWN | MOUSE_MSS_BUTTON3DOWN,
MOUSE_MSS_BUTTON3DOWN, MOUSE_MSS_BUTTON1DOWN | MOUSE_MSS_BUTTON3DOWN,
};
unsigned char delta;
if (maxlen - *len < MOUSE_MSS_PACKETSIZE)
return FALSE;
buf[0] = MOUSE_MSS_SYNC | butmap[status->button & MOUSE_STDBUTTONS];
if (status->dx < -128)
delta = 0x80; /* -128 */
else
if (status->dx > 127)
delta = 0x7f; /* 127 */
else
delta = (unsigned char) status->dx;
buf[0] |= (delta & 0xc0) >> 6; /* bit 6-7 */
buf[1] = delta & 0x3f; /* bit 0-5 */
if (status->dy < -128)
delta = 0x80; /* -128 */
else
if (status->dy > 127)
delta = 0x7f; /* 127 */
else
delta = (unsigned char) status->dy;
buf[0] |= (delta & 0xc0) >> 4; /* bit 6-7 */
buf[2] = delta & 0x3f; /* bit 0-5 */
*len += MOUSE_MSS_PACKETSIZE;
return TRUE;
}
static int
mkman(unsigned char *buf, int *len, int maxlen, register mousestatus_t *status)
{
static int butmap[] = {
0, MOUSE_MSS_BUTTON1DOWN,
0, MOUSE_MSS_BUTTON1DOWN,
MOUSE_MSS_BUTTON3DOWN, MOUSE_MSS_BUTTON1DOWN | MOUSE_MSS_BUTTON3DOWN,
MOUSE_MSS_BUTTON3DOWN, MOUSE_MSS_BUTTON1DOWN | MOUSE_MSS_BUTTON3DOWN,
};
unsigned char delta;
int l;
l = ((status->button ^ status->obutton) & MOUSE_BUTTON2DOWN) ?
MOUSE_MSS_PACKETSIZE + 1: MOUSE_MSS_PACKETSIZE;
if (maxlen - *len < l)
return FALSE;
buf[0] = MOUSE_MSS_SYNC | butmap[status->button & MOUSE_STDBUTTONS];
if (status->dx < -128)
delta = 0x80; /* -128 */
else
if (status->dx > 127)
delta = 0x7f; /* 127 */
else
delta = (unsigned char) status->dx;
buf[0] |= (delta & 0xc0) >> 6; /* bit 6-7 */
buf[1] = delta & 0x3f; /* bit 0-5 */
if (status->dy < -128)
delta = 0x80; /* -128 */
else
if (status->dy > 127)
delta = 0x7f; /* 127 */
else
delta = (unsigned char) status->dy;
buf[0] |= (delta & 0xc0) >> 4; /* bit 6-7 */
buf[2] = delta & 0x3f; /* bit 0-5 */
if (l > MOUSE_MSS_PACKETSIZE)
buf[3] = (status->button & MOUSE_BUTTON2DOWN)
? MOUSE_LMAN_BUTTON2DOWN : 0;
*len += l;
return TRUE;
}
static int
mkmsc(unsigned char *buf, int *len, int maxlen, register mousestatus_t *status)
{
static int butmap[] = {
0,
MOUSE_MSC_BUTTON1UP, MOUSE_MSC_BUTTON2UP,
MOUSE_MSC_BUTTON1UP | MOUSE_MSC_BUTTON2UP,
MOUSE_MSC_BUTTON3UP,
MOUSE_MSC_BUTTON1UP | MOUSE_MSC_BUTTON3UP,
MOUSE_MSC_BUTTON2UP | MOUSE_MSC_BUTTON3UP,
MOUSE_MSC_BUTTON1UP | MOUSE_MSC_BUTTON2UP | MOUSE_MSC_BUTTON3UP,
};
register int delta;
if (maxlen - *len < MOUSE_MSC_PACKETSIZE)
return FALSE;
buf[0] = MOUSE_MSC_SYNC
| (~butmap[status->button & MOUSE_STDBUTTONS] & MOUSE_MSC_BUTTONS);
/* data bytes cannot be between 80h (-128) and 87h (-120).
* values we can return is 255 (0ffh) through -251 (10fh = 87h*2 + 1).
*/
if (status->dx < -251)
delta = -251;
else
if (status->dx > 255)
delta = 255;
else
delta = status->dx;
buf[1] = delta/2;
buf[3] = delta - buf[1];
if (status->dy < -251)
delta = -251;
else
if (status->dy > 255)
delta = 255;
else
delta = status->dy;
buf[2] = delta/2;
buf[4] = delta - buf[2];
*len += MOUSE_MSC_PACKETSIZE;
return TRUE;
}
static int
mkmm(unsigned char *buf, int *len, int maxlen, register mousestatus_t *status)
{
static int butmap[] = {
0,
MOUSE_MM_BUTTON1DOWN, MOUSE_MM_BUTTON2DOWN,
MOUSE_MM_BUTTON1DOWN | MOUSE_MM_BUTTON2DOWN,
MOUSE_MM_BUTTON3DOWN,
MOUSE_MM_BUTTON1DOWN | MOUSE_MM_BUTTON3DOWN,
MOUSE_MM_BUTTON2DOWN | MOUSE_MM_BUTTON3DOWN,
MOUSE_MM_BUTTON1DOWN | MOUSE_MM_BUTTON2DOWN | MOUSE_MM_BUTTON3DOWN,
};
int delta;
if (maxlen - *len < MOUSE_MM_PACKETSIZE)
return FALSE;
buf[0] = MOUSE_MM_SYNC
| butmap[status->button & MOUSE_STDBUTTONS]
| ((status->dx > 0) ? MOUSE_MM_XPOSITIVE : 0)
| ((status->dy > 0) ? MOUSE_MM_YPOSITIVE : 0);
delta = (status->dx < 0) ? -status->dx : status->dx;
buf[1] = min(delta, 127);
delta = (status->dy < 0) ? -status->dy : status->dy;
buf[2] = min(delta, 127);
*len += MOUSE_MM_PACKETSIZE;
return TRUE;
}
#endif /* PSM_EMULATION */
static int
mkps2(unsigned char *buf, int *len, int maxlen, register mousestatus_t *status)
{
static int butmap[] = {
0,
MOUSE_PS2_BUTTON1DOWN, MOUSE_PS2_BUTTON2DOWN,
MOUSE_PS2_BUTTON1DOWN | MOUSE_PS2_BUTTON2DOWN,
MOUSE_PS2_BUTTON3DOWN,
MOUSE_PS2_BUTTON1DOWN | MOUSE_PS2_BUTTON3DOWN,
MOUSE_PS2_BUTTON2DOWN | MOUSE_PS2_BUTTON3DOWN,
MOUSE_PS2_BUTTON1DOWN | MOUSE_PS2_BUTTON2DOWN | MOUSE_PS2_BUTTON3DOWN,
};
register int delta;
if (maxlen - *len < MOUSE_PS2_PACKETSIZE)
return FALSE;
buf[0] = ((status->button & MOUSE_BUTTON4DOWN) ? 0 : MOUSE_PS2_BUTTON4UP)
| butmap[status->button & MOUSE_STDBUTTONS];
if ((verbose >= 2) && ((buf[0] & MOUSE_PS2_BUTTON4UP) == 0))
log(LOG_DEBUG, "psm: button 4 down (%04x) (mkps2)\n", buf[0]);
if (status->dx < -128)
delta = -128;
else
if (status->dx > 127)
delta = 127;
else
delta = status->dx;
if (delta < 0)
buf[0] |= MOUSE_PS2_XNEG;
buf[1] = delta;
if (status->dy < -128)
delta = -128;
else
if (status->dy > 127)
delta = 127;
else
delta = status->dy;
if (delta < 0)
buf[0] |= MOUSE_PS2_YNEG;
buf[2] = delta;
*len += MOUSE_PS2_PACKETSIZE;
return TRUE;
}
static int
psmread(dev_t dev, struct uio *uio, int flag)
{
register struct psm_softc *sc = psm_softc[PSM_UNIT(dev)];
unsigned int length;
int error;
int s;
int i;
/* block until mouse activity occured */
s = spltty();
if ((sc->outputbytes <= 0) && (sc->queue.count <= 0)) {
while (sc->queue.count <= 0) {
if (PSM_NBLOCKIO(dev)) {
splx(s);
return (EWOULDBLOCK);
}
sc->state |= PSM_ASLP;
error = tsleep((caddr_t) sc, PZERO | PCATCH, "psmread", 0);
if (error) {
splx(s);
return (error);
}
}
}
if (sc->outputbytes >= uio->uio_resid) {
/* nothing to be done */
} else {
if (sc->outputbytes > 0) {
bcopy(&sc->opacket[sc->outputhead], sc->opacket,
sc->outputbytes);
}
sc->outputhead = 0;
for (i = sc->queue.head; sc->queue.count > 0;
i = (i + 1) % PSM_BUFSIZE, --sc->queue.count) {
if (!(*sc->mkpacket) (&sc->opacket[sc->outputbytes],
&sc->outputbytes, PSM_BUFSIZE, &sc->queue.buf[i]))
break;
}
sc->queue.head = i;
}
/* allow interrupts again */
splx(s);
/* copy data to user process */
length = min(sc->outputbytes, uio->uio_resid);
error = uiomove(&sc->opacket[sc->outputhead], length, uio);
if (error)
return (error);
sc->outputhead += length;
sc->outputbytes -= length;
return (error);
}
static int
psmioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p)
{
struct psm_softc *sc = psm_softc[PSM_UNIT(dev)];
mousemode_t mode;
mousestatus_t status;
packetfunc_t func;
int error = 0;
int s;
/* Perform IOCTL command */
switch (cmd) {
case MOUSE_GETINFO:
*(mousehw_t *) addr = sc->hw;
break;
case MOUSE_GETMODE:
*(mousemode_t *) addr = sc->mode;
break;
case MOUSE_SETMODE:
mode = *(mousemode_t *) addr;
if (mode.rate == 0) {
mode.rate = PSMD_DEFAULT_RATE;
} else if (mode.rate > 0) {
mode.rate = min(mode.rate, PSMD_MAX_RATE);
} else { /* mode.rate < 0 */
mode.rate = sc->mode.rate;
}
if (mode.resolution == 0) {
mode.resolution = PSMD_DEFAULT_RESOLUTION;
} else if (mode.resolution > 0) {
mode.resolution = mode.resolution;
} else { /* mode.resolution < 0 */
mode.resolution = sc->mode.resolution;
}
#ifdef PSM_EMULATION
switch (mode.protocol) {
case MOUSE_PROTO_MS:
func = mkms;
break;
case MOUSE_PROTO_LOGIMOUSEMAN:
func = mkman;
break;
case MOUSE_PROTO_MSC:
func = mkmsc;
break;
case MOUSE_PROTO_MM:
func = mkmm;
break;
case MOUSE_PROTO_PS2:
func = mkps2;
break;
default:
error = EINVAL;
func = (packetfunc_t) NULL;
break;
}
if (error)
break;
#else
mode.protocol = sc->mode.protocol;
#endif /* PSM_EMULATION */
if (mode.accelfactor < 0) {
error = EINVAL;
break;
}
s = spltty(); /* disable interrupt while updating */
/* temporalily disable the keyboard */
if (!set_controller_command_byte(sc->addr,
sc->command_byte & ~KBD_KBD_CONTROL_BITS,
KBD_DISABLE_KBD_PORT | KBD_DISABLE_KBD_INT
| KBD_ENABLE_AUX_PORT | KBD_DISABLE_AUX_INT)) {
/* this is CONTROLLER ERROR; I don't know how to recover
* from this error. The least we can do is to send
* ENABLE_KBD_PORT...
*/
write_controller_command(sc->addr, KBDC_ENABLE_KBD_PORT);
splx(s);
log(LOG_ERR, "psm%d: failed to set the command byte (psmioctl).\n",
PSM_UNIT(dev));
error = EIO;
break;
}
/* program the mouse */
if (mode.rate > 0)
mode.rate = set_mouse_sampling_rate(sc->addr, mode.rate);
if (mode.resolution > 0)
mode.resolution = set_mouse_resolution(sc->addr, mode.resolution);
/* enable the aux port and interrupt */
if (!set_controller_command_byte(sc->addr, sc->command_byte,
KBD_ENABLE_AUX_PORT | KBD_ENABLE_AUX_INT)) {
/* CONTROLLER ERROR; this is serious, we may have
* been left with the unaccessible keyboard and
* the disabled mouse interrupt.
*/
splx(s);
log(LOG_ERR, "psm%d: failed to re-enable the aux port and int (psmioctl).\n",
PSM_UNIT(dev));
error = EIO;
break;
}
sc->mode = mode;
#ifdef PSM_EMULATION
sc->mkpacket = func;
sc->outputbytes = 0;
sc->outputhead = 0;
#endif /* PSM_EMULATION */
splx(s);
break;
case MOUSEIOCREAD: /* FIXME:XXX this should go... */
error = EINVAL;
break;
case MOUSE_GETSTATE:
s = spltty();
if (sc->queue.count > 0) {
status = sc->queue.buf[sc->queue.head];
sc->queue.head = (sc->queue.head + 1) % PSM_BUFSIZE;
--sc->queue.count;
} else {
status.button = status.obutton = sc->button;
status.dx = status.dy = 0;
}
splx(s);
*(mousestatus_t *) addr = status;
break;
default:
error = EINVAL;
break;
}
/* Return error code */
return (error);
}
void
psmintr(int unit)
{
/*
* the table to turn PS/2 mouse button bits (MOUSE_PS2_BUTTON?DOWN)
* into `mousestatus' button bits (BUTTON?DOWN).
*/
static butmap[8] = {
0,
MOUSE_BUTTON1DOWN, MOUSE_BUTTON3DOWN,
MOUSE_BUTTON1DOWN | MOUSE_BUTTON3DOWN,
MOUSE_BUTTON2DOWN,
MOUSE_BUTTON1DOWN | MOUSE_BUTTON2DOWN,
MOUSE_BUTTON2DOWN | MOUSE_BUTTON3DOWN,
MOUSE_BUTTON1DOWN | MOUSE_BUTTON2DOWN | MOUSE_BUTTON3DOWN
};
register struct psm_softc *sc = psm_softc[unit];
int ioport = sc->addr;
mousestatus_t *ms;
unsigned char c;
int x, y;
/* is this really for us? */
if ((inb(ioport + KBD_STATUS_PORT) & KBDS_BUFFER_FULL)
!= KBDS_AUX_BUFFER_FULL)
return;
DELAY(7);
/* read a byte */
c = inb(ioport + KBD_DATA_PORT);
/* discard the byte if the device is not open */
if ((sc->state & PSM_OPEN) == 0)
return;
/* interpret data bytes */
/*
* FIXME: there seems no way to reliably
* re-synchronize with the PS/2 mouse once we are out of sync. Sure,
* there is sync bits in the first data byte, but the second and the
* third bytes may have these bits on (they are not functioning as
* sync bits then!). There need to be two consequtive bytes with these
* bits off to re-sync. (This can be done if the user clicks buttons
* without moving the mouse?)
*/
if (sc->inputbytes == 0) {
#ifdef PSM_CHECKSYNC
if ((c & MOUSE_PS2_SYNCMASK) == MOUSE_PS2_SYNC)
sc->ipacket[sc->inputbytes++] = c;
else
log(LOG_DEBUG, "psmintr: sync. bit is off.\n");
#else
sc->ipacket[sc->inputbytes++] = c;
#endif /* PSM_CHECKSYNC */
} else {
sc->ipacket[sc->inputbytes++] = c;
if (sc->inputbytes >= MOUSE_PS2_PACKETSIZE) {
if (sc->queue.count >= PSM_BUFSIZE) {
/* no room in the queue */
sc->inputbytes = 0;
return;
}
if (sc->mode.accelfactor >= 1) {
x = (sc->ipacket[0] & MOUSE_PS2_XOVERFLOW) ?
128 : sc->ipacket[1];
if (x != 0) {
x = x * x / sc->mode.accelfactor;
if (x == 0)
x = 1;
if (sc->ipacket[0] & MOUSE_PS2_XNEG)
x = -x;
}
y = (sc->ipacket[0] & MOUSE_PS2_YOVERFLOW) ?
128 : sc->ipacket[2];
if (y != 0) {
y = y * y / sc->mode.accelfactor;
if (y == 0)
y = 1;
if (sc->ipacket[0] & MOUSE_PS2_YNEG)
y = -y;
}
} else {/* sc->mode.accelfactor <= 0 */
x = (sc->ipacket[0] & MOUSE_PS2_XOVERFLOW) ?
((sc->ipacket[0] & MOUSE_PS2_XNEG) ?
-128 : 127) : sc->ipacket[1];
y = (sc->ipacket[0] & MOUSE_PS2_YOVERFLOW) ?
((sc->ipacket[0] & MOUSE_PS2_YNEG) ?
-128 : 127) : sc->ipacket[2];
}
/*
* FIXME:XXX
* we shouldn't store data if no movement and
* no button status change is detected?
*/
ms = &sc->queue.buf[sc->queue.tail];
ms->dx = x;
ms->dy = y;
ms->obutton = sc->button; /* previous button state */
sc->button = ms->button = /* latest button state */
butmap[sc->ipacket[0] & MOUSE_PS2_BUTTONS]
| ((sc->ipacket[0] & MOUSE_PS2_BUTTON4UP)
? 0 : MOUSE_BUTTON4DOWN);
#if 0
if ((verbose >= 2)
&& ((sc->ipacket[0] & MOUSE_PS2_BUTTON4UP) == 0))
log(LOG_DEBUG, "psm%d: button 4 down (%04x) (psmintr)\n",
unit, sc->ipacket[0]);
#endif
sc->queue.tail =
(sc->queue.tail + 1) % PSM_BUFSIZE;
++sc->queue.count;
sc->inputbytes = 0;
}
}
if (sc->state & PSM_ASLP) {
sc->state &= ~PSM_ASLP;
wakeup((caddr_t) sc);
}
selwakeup(&sc->rsel);
}
static int
psmselect(dev_t dev, int rw, struct proc *p)
{
struct psm_softc *sc = psm_softc[PSM_UNIT(dev)];
int s, ret;
/* Silly to select for output */
if (rw == FWRITE)
return (0);
/* Return true if a mouse event available */
s = spltty();
if ((sc->outputbytes > 0) || (sc->queue.count > 0)) {
ret = 1;
} else {
selrecord(p, &sc->rsel);
ret = 0;
}
splx(s);
return (ret);
}
static int psm_devsw_installed = FALSE;
static void
psm_drvinit(void *unused)
{
dev_t dev;
if (!psm_devsw_installed) {
dev = makedev(CDEV_MAJOR, 0);
cdevsw_add(&dev, &psm_cdevsw, NULL);
psm_devsw_installed = TRUE;
}
}
SYSINIT(psmdev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE + CDEV_MAJOR, psm_drvinit, NULL)
#endif /* NPSM > 0 */
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