stallion.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 2,504 行 · 第 1/5 页

		    (sio.close_delay != portp->close_delay) ||
		    ((sio.flags & ~ASYNC_USR_MASK) !=
		    (portp->flags & ~ASYNC_USR_MASK)))
			return(-EPERM);
	} 

	portp->flags = (portp->flags & ~ASYNC_USR_MASK) |
		(sio.flags & ASYNC_USR_MASK);
	portp->baud_base = sio.baud_base;
	portp->close_delay = sio.close_delay;
	portp->closing_wait = sio.closing_wait;
	portp->custom_divisor = sio.custom_divisor;
	stl_setport(portp, portp->tty->termios);
	return(0);
}

/*****************************************************************************/

static int stl_tiocmget(struct tty_struct *tty, struct file *file)
{
	stlport_t	*portp;

	if (tty == (struct tty_struct *) NULL)
		return(-ENODEV);
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return(-ENODEV);
	if (tty->flags & (1 << TTY_IO_ERROR))
		return(-EIO);

	return stl_getsignals(portp);
}

static int stl_tiocmset(struct tty_struct *tty, struct file *file,
			unsigned int set, unsigned int clear)
{
	stlport_t	*portp;
	int rts = -1, dtr = -1;

	if (tty == (struct tty_struct *) NULL)
		return(-ENODEV);
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return(-ENODEV);
	if (tty->flags & (1 << TTY_IO_ERROR))
		return(-EIO);

	if (set & TIOCM_RTS)
		rts = 1;
	if (set & TIOCM_DTR)
		dtr = 1;
	if (clear & TIOCM_RTS)
		rts = 0;
	if (clear & TIOCM_DTR)
		dtr = 0;

	stl_setsignals(portp, dtr, rts);
	return 0;
}

static int stl_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
{
	stlport_t	*portp;
	unsigned int	ival;
	int		rc;
	void __user *argp = (void __user *)arg;

#ifdef DEBUG
	printk("stl_ioctl(tty=%x,file=%x,cmd=%x,arg=%x)\n",
		(int) tty, (int) file, cmd, (int) arg);
#endif

	if (tty == (struct tty_struct *) NULL)
		return(-ENODEV);
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return(-ENODEV);

	if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
 	    (cmd != COM_GETPORTSTATS) && (cmd != COM_CLRPORTSTATS)) {
		if (tty->flags & (1 << TTY_IO_ERROR))
			return(-EIO);
	}

	rc = 0;

	switch (cmd) {
	case TIOCGSOFTCAR:
		rc = put_user(((tty->termios->c_cflag & CLOCAL) ? 1 : 0),
			(unsigned __user *) argp);
		break;
	case TIOCSSOFTCAR:
		if (get_user(ival, (unsigned int __user *) arg))
			return -EFAULT;
		tty->termios->c_cflag =
				(tty->termios->c_cflag & ~CLOCAL) |
				(ival ? CLOCAL : 0);
		break;
	case TIOCGSERIAL:
		rc = stl_getserial(portp, argp);
		break;
	case TIOCSSERIAL:
		rc = stl_setserial(portp, argp);
		break;
	case COM_GETPORTSTATS:
		rc = stl_getportstats(portp, argp);
		break;
	case COM_CLRPORTSTATS:
		rc = stl_clrportstats(portp, argp);
		break;
	case TIOCSERCONFIG:
	case TIOCSERGWILD:
	case TIOCSERSWILD:
	case TIOCSERGETLSR:
	case TIOCSERGSTRUCT:
	case TIOCSERGETMULTI:
	case TIOCSERSETMULTI:
	default:
		rc = -ENOIOCTLCMD;
		break;
	}

	return(rc);
}

/*****************************************************************************/

static void stl_settermios(struct tty_struct *tty, struct termios *old)
{
	stlport_t	*portp;
	struct termios	*tiosp;

#ifdef DEBUG
	printk("stl_settermios(tty=%x,old=%x)\n", (int) tty, (int) old);
#endif

	if (tty == (struct tty_struct *) NULL)
		return;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return;

	tiosp = tty->termios;
	if ((tiosp->c_cflag == old->c_cflag) &&
	    (tiosp->c_iflag == old->c_iflag))
		return;

	stl_setport(portp, tiosp);
	stl_setsignals(portp, ((tiosp->c_cflag & (CBAUD & ~CBAUDEX)) ? 1 : 0),
		-1);
	if ((old->c_cflag & CRTSCTS) && ((tiosp->c_cflag & CRTSCTS) == 0)) {
		tty->hw_stopped = 0;
		stl_start(tty);
	}
	if (((old->c_cflag & CLOCAL) == 0) && (tiosp->c_cflag & CLOCAL))
		wake_up_interruptible(&portp->open_wait);
}

/*****************************************************************************/

/*
 *	Attempt to flow control who ever is sending us data. Based on termios
 *	settings use software or/and hardware flow control.
 */

static void stl_throttle(struct tty_struct *tty)
{
	stlport_t	*portp;

#ifdef DEBUG
	printk("stl_throttle(tty=%x)\n", (int) tty);
#endif

	if (tty == (struct tty_struct *) NULL)
		return;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return;
	stl_flowctrl(portp, 0);
}

/*****************************************************************************/

/*
 *	Unflow control the device sending us data...
 */

static void stl_unthrottle(struct tty_struct *tty)
{
	stlport_t	*portp;

#ifdef DEBUG
	printk("stl_unthrottle(tty=%x)\n", (int) tty);
#endif

	if (tty == (struct tty_struct *) NULL)
		return;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return;
	stl_flowctrl(portp, 1);
}

/*****************************************************************************/

/*
 *	Stop the transmitter. Basically to do this we will just turn TX
 *	interrupts off.
 */

static void stl_stop(struct tty_struct *tty)
{
	stlport_t	*portp;

#ifdef DEBUG
	printk("stl_stop(tty=%x)\n", (int) tty);
#endif

	if (tty == (struct tty_struct *) NULL)
		return;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return;
	stl_startrxtx(portp, -1, 0);
}

/*****************************************************************************/

/*
 *	Start the transmitter again. Just turn TX interrupts back on.
 */

static void stl_start(struct tty_struct *tty)
{
	stlport_t	*portp;

#ifdef DEBUG
	printk("stl_start(tty=%x)\n", (int) tty);
#endif

	if (tty == (struct tty_struct *) NULL)
		return;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return;
	stl_startrxtx(portp, -1, 1);
}

/*****************************************************************************/

/*
 *	Hangup this port. This is pretty much like closing the port, only
 *	a little more brutal. No waiting for data to drain. Shutdown the
 *	port and maybe drop signals.
 */

static void stl_hangup(struct tty_struct *tty)
{
	stlport_t	*portp;

#ifdef DEBUG
	printk("stl_hangup(tty=%x)\n", (int) tty);
#endif

	if (tty == (struct tty_struct *) NULL)
		return;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return;

	portp->flags &= ~ASYNC_INITIALIZED;
	stl_disableintrs(portp);
	if (tty->termios->c_cflag & HUPCL)
		stl_setsignals(portp, 0, 0);
	stl_enablerxtx(portp, 0, 0);
	stl_flushbuffer(tty);
	portp->istate = 0;
	set_bit(TTY_IO_ERROR, &tty->flags);
	if (portp->tx.buf != (char *) NULL) {
		kfree(portp->tx.buf);
		portp->tx.buf = (char *) NULL;
		portp->tx.head = (char *) NULL;
		portp->tx.tail = (char *) NULL;
	}
	portp->tty = (struct tty_struct *) NULL;
	portp->flags &= ~ASYNC_NORMAL_ACTIVE;
	portp->refcount = 0;
	wake_up_interruptible(&portp->open_wait);
}

/*****************************************************************************/

static void stl_flushbuffer(struct tty_struct *tty)
{
	stlport_t	*portp;

#ifdef DEBUG
	printk("stl_flushbuffer(tty=%x)\n", (int) tty);
#endif

	if (tty == (struct tty_struct *) NULL)
		return;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return;

	stl_flush(portp);
	tty_wakeup(tty);
}

/*****************************************************************************/

static void stl_breakctl(struct tty_struct *tty, int state)
{
	stlport_t	*portp;

#ifdef DEBUG
	printk("stl_breakctl(tty=%x,state=%d)\n", (int) tty, state);
#endif

	if (tty == (struct tty_struct *) NULL)
		return;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return;

	stl_sendbreak(portp, ((state == -1) ? 1 : 2));
}

/*****************************************************************************/

static void stl_waituntilsent(struct tty_struct *tty, int timeout)
{
	stlport_t	*portp;
	unsigned long	tend;

#ifdef DEBUG
	printk("stl_waituntilsent(tty=%x,timeout=%d)\n", (int) tty, timeout);
#endif

	if (tty == (struct tty_struct *) NULL)
		return;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return;

	if (timeout == 0)
		timeout = HZ;
	tend = jiffies + timeout;

	while (stl_datastate(portp)) {
		if (signal_pending(current))
			break;
		stl_delay(2);
		if (time_after_eq(jiffies, tend))
			break;
	}
}

/*****************************************************************************/

static void stl_sendxchar(struct tty_struct *tty, char ch)
{
	stlport_t	*portp;

#ifdef DEBUG
	printk("stl_sendxchar(tty=%x,ch=%x)\n", (int) tty, ch);
#endif

	if (tty == (struct tty_struct *) NULL)
		return;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return;

	if (ch == STOP_CHAR(tty))
		stl_sendflow(portp, 0);
	else if (ch == START_CHAR(tty))
		stl_sendflow(portp, 1);
	else
		stl_putchar(tty, ch);
}

/*****************************************************************************/

#define	MAXLINE		80

/*
 *	Format info for a specified port. The line is deliberately limited
 *	to 80 characters. (If it is too long it will be truncated, if too
 *	short then padded with spaces).
 */

static int stl_portinfo(stlport_t *portp, int portnr, char *pos)
{
	char	*sp;
	int	sigs, cnt;

	sp = pos;
	sp += sprintf(sp, "%d: uart:%s tx:%d rx:%d",
		portnr, (portp->hwid == 1) ? "SC26198" : "CD1400",
		(int) portp->stats.txtotal, (int) portp->stats.rxtotal);

	if (portp->stats.rxframing)
		sp += sprintf(sp, " fe:%d", (int) portp->stats.rxframing);
	if (portp->stats.rxparity)
		sp += sprintf(sp, " pe:%d", (int) portp->stats.rxparity);
	if (portp->stats.rxbreaks)
		sp += sprintf(sp, " brk:%d", (int) portp->stats.rxbreaks);
	if (portp->stats.rxoverrun)
		sp += sprintf(sp, " oe:%d", (int) portp->stats.rxoverrun);

	sigs = stl_getsignals(portp);
	cnt = sprintf(sp, "%s%s%s%s%s ",
		(sigs & TIOCM_RTS) ? "|RTS" : "",
		(sigs & TIOCM_CTS) ? "|CTS" : "",
		(sigs & TIOCM_DTR) ? "|DTR" : "",
		(sigs & TIOCM_CD) ? "|DCD" : "",
		(sigs & TIOCM_DSR) ? "|DSR" : "");
	*sp = ' ';
	sp += cnt;

	for (cnt = (sp - pos); (cnt < (MAXLINE - 1)); cnt++)
		*sp++ = ' ';
	if (cnt >= MAXLINE)
		pos[(MAXLINE - 2)] = '+';
	pos[(MAXLINE - 1)] = '\n';

	return(MAXLINE);
}

/*****************************************************************************/

/*
 *	Port info, read from the /proc file system.
 */

static int stl_readproc(char *page, char **start, off_t off, int count, int *eof, void *data)
{
	stlbrd_t	*brdp;
	stlpanel_t	*panelp;
	stlport_t	*portp;
	int		brdnr, panelnr, portnr, totalport;
	int		curoff, maxoff;
	char		*pos;

#ifdef DEBUG
	printk("stl_readproc(page=%x,start=%x,off=%x,count=%d,eof=%x,"
		"data=%x\n", (int) page, (int) start, (int) off, count,
		(int) eof, (int) data);
#endif

	pos = page;
	totalport = 0;
	curoff = 0;

	if (off == 0) {
		pos += sprintf(pos, "%s: version %s", stl_drvtitle,
			stl_drvversion);
		while (pos < (page + MAXLINE - 1))
			*pos++ = ' ';
		*pos++ = '\n';
	}
	curoff =  MAXLINE;

/*
 *	We scan through for each board, panel and port. The offset is
 *	calculated on the fly, and irrelevant ports are skipped.
 */
	for (brdnr = 0; (brdnr < stl_nrbrds); brdnr++) {
		brdp = stl_brds[brdnr];
		if (brdp == (stlbrd_t *) NULL)
			continue;
		if (brdp->state == 0)
			continue;

		maxoff = curoff + (brdp->nrports * MAXLINE);
		if (off >= maxoff) {
			curoff = maxoff;
			continue;
		}

		totalport = brdnr * STL_MAXPORTS;
		for (panelnr = 0; (panelnr < brdp->nrpanels); panelnr++) {
			panelp = brdp->panels[panelnr];
			if (panelp == (stlpanel_t *) NULL)
				continue;

			maxoff = curoff + (panelp->nrports * MAXLINE);
			if (off >= maxoff) {
				curoff = maxoff;
				totalport += panelp->nrports;
				continue;
			}

			for (portnr = 0; (portnr < panelp->nrports); portnr++,
			    totalport++) {
				portp = panelp->ports[portnr];
				if (portp == (stlport_t *) NULL)
					continue;
				if (off >= (curoff += MAXLINE))