NetBSD-5.0.2/sys/dev/ofw/ofcons.c
/* $NetBSD: ofcons.c,v 1.34 2008/06/12 22:28:26 cegger Exp $ */
/*
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
* Copyright (C) 1995, 1996 TooLs GmbH.
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ofcons.c,v 1.34 2008/06/12 22:28:26 cegger Exp $");
#include <sys/param.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/tty.h>
#include <sys/kauth.h>
#include <dev/cons.h>
#include <dev/ofw/openfirm.h>
struct ofcons_softc {
struct device of_dev;
struct tty *of_tty;
struct callout sc_poll_ch;
int of_flags;
};
/* flags: */
#define OFPOLL 1
#define OFBURSTLEN 128 /* max number of bytes to write in one chunk */
cons_decl(ofcons_);
static int stdin, stdout;
static int ofcons_match(struct device *, struct cfdata *, void *);
static void ofcons_attach(struct device *, struct device *, void *);
CFATTACH_DECL(ofcons, sizeof(struct ofcons_softc),
ofcons_match, ofcons_attach, NULL, NULL);
extern struct cfdriver ofcons_cd;
dev_type_open(ofcons_open);
dev_type_close(ofcons_close);
dev_type_read(ofcons_read);
dev_type_write(ofcons_write);
dev_type_ioctl(ofcons_ioctl);
dev_type_tty(ofcons_tty);
dev_type_poll(ofcons_poll);
const struct cdevsw ofcons_cdevsw = {
ofcons_open, ofcons_close, ofcons_read, ofcons_write, ofcons_ioctl,
nostop, ofcons_tty, ofcons_poll, nommap, ttykqfilter, D_TTY
};
static int ofcons_probe(void);
static int
ofcons_match(parent, match, aux)
struct device *parent;
struct cfdata *match;
void *aux;
{
struct ofbus_attach_args *oba = aux;
if (strcmp(oba->oba_busname, "ofw"))
return (0);
if (!ofcons_probe())
return 0;
return OF_instance_to_package(stdin) == oba->oba_phandle
|| OF_instance_to_package(stdout) == oba->oba_phandle;
}
static void
ofcons_attach(parent, self, aux)
struct device *parent, *self;
void *aux;
{
struct ofcons_softc *sc = device_private(self);
printf("\n");
callout_init(&sc->sc_poll_ch, 0);
}
static void ofcons_start(struct tty *);
static int ofcons_param(struct tty *, struct termios *);
static void ofcons_pollin(void *);
int
ofcons_open(dev_t dev, int flag, int mode, struct lwp *l)
{
struct ofcons_softc *sc;
struct tty *tp;
sc = device_lookup_private(&ofcons_cd, minor(dev));;
if (!sc)
return ENXIO;
if (!(tp = sc->of_tty))
sc->of_tty = tp = ttymalloc();
tp->t_oproc = ofcons_start;
tp->t_param = ofcons_param;
tp->t_dev = dev;
if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp))
return (EBUSY);
if (!(tp->t_state & TS_ISOPEN)) {
ttychars(tp);
tp->t_iflag = TTYDEF_IFLAG;
tp->t_oflag = TTYDEF_OFLAG;
tp->t_cflag = TTYDEF_CFLAG;
tp->t_lflag = TTYDEF_LFLAG;
tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
ofcons_param(tp, &tp->t_termios);
ttsetwater(tp);
}
tp->t_state |= TS_CARR_ON;
if (!(sc->of_flags & OFPOLL)) {
sc->of_flags |= OFPOLL;
callout_reset(&sc->sc_poll_ch, 1, ofcons_pollin, sc);
}
return (*tp->t_linesw->l_open)(dev, tp);
}
int
ofcons_close(dev_t dev, int flag, int mode, struct lwp *l)
{
struct ofcons_softc *sc = device_lookup_private(&ofcons_cd, minor(dev));
struct tty *tp = sc->of_tty;
callout_stop(&sc->sc_poll_ch);
sc->of_flags &= ~OFPOLL;
(*tp->t_linesw->l_close)(tp, flag);
ttyclose(tp);
return 0;
}
int
ofcons_read(dev_t dev, struct uio *uio, int flag)
{
struct ofcons_softc *sc = device_lookup_private(&ofcons_cd, minor(dev));
struct tty *tp = sc->of_tty;
return (*tp->t_linesw->l_read)(tp, uio, flag);
}
int
ofcons_write(dev_t dev, struct uio *uio, int flag)
{
struct ofcons_softc *sc = device_lookup_private(&ofcons_cd, minor(dev));
struct tty *tp = sc->of_tty;
return (*tp->t_linesw->l_write)(tp, uio, flag);
}
int
ofcons_poll(dev_t dev, int events, struct lwp *l)
{
struct ofcons_softc *sc = device_lookup_private(&ofcons_cd, minor(dev));
struct tty *tp = sc->of_tty;
return ((*tp->t_linesw->l_poll)(tp, events, l));
}
int
ofcons_ioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
{
struct ofcons_softc *sc = device_lookup_private(&ofcons_cd, minor(dev));
struct tty *tp = sc->of_tty;
int error;
if ((error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l)) != EPASSTHROUGH)
return error;
return ttioctl(tp, cmd, data, flag, l);
}
struct tty *
ofcons_tty(dev_t dev)
{
struct ofcons_softc *sc = device_lookup_private(&ofcons_cd, minor(dev));
return sc->of_tty;
}
static void
ofcons_start(tp)
struct tty *tp;
{
int s, len;
u_char buf[OFBURSTLEN];
s = spltty();
if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) {
splx(s);
return;
}
tp->t_state |= TS_BUSY;
splx(s);
len = q_to_b(cl, buf, OFBURSTLEN);
OF_write(stdout, buf, len);
s = spltty();
tp->t_state &= ~TS_BUSY;
if (ttypull(tp)) {
tp->t_state |= TS_TIMEOUT;
callout_schedule(&tp->t_rstrt_ch, 1);
}
splx(s);
}
static int
ofcons_param(tp, t)
struct tty *tp;
struct termios *t;
{
tp->t_ispeed = t->c_ispeed;
tp->t_ospeed = t->c_ospeed;
tp->t_cflag = t->c_cflag;
return 0;
}
static void
ofcons_pollin(aux)
void *aux;
{
struct ofcons_softc *sc = aux;
struct tty *tp = sc->of_tty;
char ch;
while (OF_read(stdin, &ch, 1) > 0) {
if (tp && (tp->t_state & TS_ISOPEN))
(*tp->t_linesw->l_rint)(ch, tp);
}
callout_reset(&sc->sc_poll_ch, 1, ofcons_pollin, sc);
}
static int
ofcons_probe()
{
int chosen;
char stdinbuf[4], stdoutbuf[4];
if (stdin)
return 1;
if ((chosen = OF_finddevice("/chosen")) == -1)
return 0;
if (OF_getprop(chosen, "stdin", stdinbuf, sizeof stdinbuf) !=
sizeof stdinbuf ||
OF_getprop(chosen, "stdout", stdoutbuf, sizeof stdoutbuf) !=
sizeof stdoutbuf)
return 0;
/* Decode properties. */
stdin = of_decode_int(stdinbuf);
stdout = of_decode_int(stdoutbuf);
return 1;
}
void
ofcons_cnprobe(cd)
struct consdev *cd;
{
int maj;
if (!ofcons_probe())
return;
maj = cdevsw_lookup_major(&ofcons_cdevsw);
cd->cn_dev = makedev(maj, 0);
cd->cn_pri = CN_INTERNAL;
}
void
ofcons_cninit(cd)
struct consdev *cd;
{
}
int
ofcons_cngetc(dev)
dev_t dev;
{
unsigned char ch = '\0';
int l;
while ((l = OF_read(stdin, &ch, 1)) != 1)
if (l != -2 && l != 0)
return -1;
return ch;
}
void
ofcons_cnputc(dev, c)
dev_t dev;
int c;
{
char ch = c;
OF_write(stdout, &ch, 1);
}
void
ofcons_cnpollc(dev_t dev, int on)
{
struct ofcons_softc *sc = device_lookup_private(&ofcons_cd, minor(dev));
if (!sc)
return;
if (on) {
if (sc->of_flags & OFPOLL)
callout_stop(&sc->sc_poll_ch);
sc->of_flags &= ~OFPOLL;
} else {
if (!(sc->of_flags & OFPOLL)) {
sc->of_flags |= OFPOLL;
callout_reset(&sc->sc_poll_ch, 1, ofcons_pollin, sc);
}
}
}