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tty_port: Add a port level carrier detect operation

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This is the first step to generalising the various pieces of waiting logic
duplicated in all sorts of serial drivers.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alan Cox
2009-01-02 13:45:05 +00:00
committed by Linus Torvalds
parent c9b3976e3f
commit 31f35939d1
19 changed files with 428 additions and 240 deletions
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28
drivers/char/istallion.c
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@@ -151,7 +151,7 @@ static char *stli_drvversion = "5.6.0";
static char *stli_serialname = "ttyE";
static struct tty_driver *stli_serial;
static const struct tty_port_operations stli_port_ops;
#define STLI_TXBUFSIZE 4096
@@ -1183,6 +1183,12 @@ static int stli_setport(struct tty_struct *tty)
/*****************************************************************************/
static int stli_carrier_raised(struct tty_port *port)
{
struct stliport *portp = container_of(port, struct stliport, port);
return (portp->sigs & TIOCM_CD) ? 1 : 0;
}
/*
* Possibly need to wait for carrier (DCD signal) to come high. Say
* maybe because if we are clocal then we don't need to wait...
@@ -1193,6 +1199,7 @@ static int stli_waitcarrier(struct tty_struct *tty, struct stlibrd *brdp,
{
unsigned long flags;
int rc, doclocal;
struct tty_port *port = &portp->port;
rc = 0;
doclocal = 0;
@@ -1203,7 +1210,7 @@ static int stli_waitcarrier(struct tty_struct *tty, struct stlibrd *brdp,
spin_lock_irqsave(&stli_lock, flags);
portp->openwaitcnt++;
if (! tty_hung_up_p(filp))
portp->port.count--;
port->count--;
spin_unlock_irqrestore(&stli_lock, flags);
for (;;) {
@@ -1212,27 +1219,27 @@ static int stli_waitcarrier(struct tty_struct *tty, struct stlibrd *brdp,
&portp->asig, sizeof(asysigs_t), 0)) < 0)
break;
if (tty_hung_up_p(filp) ||
((portp->port.flags & ASYNC_INITIALIZED) == 0)) {
if (portp->port.flags & ASYNC_HUP_NOTIFY)
((port->flags & ASYNC_INITIALIZED) == 0)) {
if (port->flags & ASYNC_HUP_NOTIFY)
rc = -EBUSY;
else
rc = -ERESTARTSYS;
break;
}
if (((portp->port.flags & ASYNC_CLOSING) == 0) &&
(doclocal || (portp->sigs & TIOCM_CD))) {
if (((port->flags & ASYNC_CLOSING) == 0) &&
(doclocal || tty_port_carrier_raised(port))) {
break;
}
if (signal_pending(current)) {
rc = -ERESTARTSYS;
break;
}
interruptible_sleep_on(&portp->port.open_wait);
interruptible_sleep_on(&port->open_wait);
}
spin_lock_irqsave(&stli_lock, flags);
if (! tty_hung_up_p(filp))
portp->port.count++;
port->count++;
portp->openwaitcnt--;
spin_unlock_irqrestore(&stli_lock, flags);
@@ -2696,6 +2703,7 @@ static int stli_initports(struct stlibrd *brdp)
continue;
}
tty_port_init(&portp->port);
portp->port.ops = &stli_port_ops;
portp->magic = STLI_PORTMAGIC;
portp->portnr = i;
portp->brdnr = brdp->brdnr;
@@ -4518,6 +4526,10 @@ static const struct tty_operations stli_ops = {
.tiocmset = stli_tiocmset,
};
static const struct tty_port_operations stli_port_ops = {
.carrier_raised = stli_carrier_raised,
};
/*****************************************************************************/
/*
* Loadable module initialization stuff.