[PATCH 41/75] tty: rework stallion to use the tty_port bits

Alan Cox
2009-01-02T13:46:10Z

From: Alan Cox <alan@redhat.com>

Signed-off-by: Alan Cox <alan@redhat.com>
---

drivers/char/stallion.c | 142 +++++++++++++----------------------------------
1 files changed, 38 insertions(+), 104 deletions(-)

diff --git a/drivers/char/stallion.c b/drivers/char/stallion.c
index 12aecda..77eef61 100644
--- a/drivers/char/stallion.c
+++ b/drivers/char/stallion.c
@@ -409,7 +409,6 @@ static int stl_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, uns
static int stl_brdinit(struct stlbrd *brdp);
static int stl_getportstats(struct tty_struct *tty, struct stlport *portp, comstats_t __user *cp);
static int stl_clrportstats(struct stlport *portp, comstats_t __user *cp);
-static int stl_waitcarrier(struct tty_struct *tty, struct stlport *portp, struct file *filp);

/*
* CD1400 uart specific handling functions.
@@ -705,8 +704,9 @@ static int stl_open(struct tty_struct *tty, struct file *filp)
{
struct stlport *portp;
struct stlbrd *brdp;
+ struct tty_port *port;
unsigned int minordev, brdnr, panelnr;
- int portnr, rc;
+ int portnr;

pr_debug("stl_open(tty=%p,filp=%p): device=%s\n", tty, filp, tty->name);

@@ -717,6 +717,7 @@ static int stl_open(struct tty_struct *tty, struct file *filp)
brdp = stl_brds[brdnr];
if (brdp == NULL)
return -ENODEV;
+
minordev = MINOR2PORT(minordev);
for (portnr = -1, panelnr = 0; panelnr < STL_MAXPANELS; panelnr++) {
if (brdp->panels[panelnr] == NULL)
@@ -733,16 +734,17 @@ static int stl_open(struct tty_struct *tty, struct file *filp)
portp = brdp->panels[panelnr]->ports[portnr];
if (portp == NULL)
return -ENODEV;
+ port = &portp->port;

/*
* On the first open of the device setup the port hardware, and
* initialize the per port data structure.
*/
- tty_port_tty_set(&portp->port, tty);
+ tty_port_tty_set(port, tty);
tty->driver_data = portp;
- portp->port.count++;
+ port->count++;

- if ((portp->port.flags & ASYNC_INITIALIZED) == 0) {
+ if ((port->flags & ASYNC_INITIALIZED) == 0) {
if (!portp->tx.buf) {
portp->tx.buf = kmalloc(STL_TXBUFSIZE, GFP_KERNEL);
if (!portp->tx.buf)
@@ -756,34 +758,9 @@ static int stl_open(struct tty_struct *tty, struct file *filp)
stl_enablerxtx(portp, 1, 1);
stl_startrxtx(portp, 1, 0);
clear_bit(TTY_IO_ERROR, &tty->flags);
- portp->port.flags |= ASYNC_INITIALIZED;
- }
-
-/*
- * Check if this port is in the middle of closing. If so then wait
- * until it is closed then return error status, based on flag settings.
- * The sleep here does not need interrupt protection since the wakeup
- * for it is done with the same context.
- */
- if (portp->port.flags & ASYNC_CLOSING) {
- interruptible_sleep_on(&portp->port.close_wait);
- if (portp->port.flags & ASYNC_HUP_NOTIFY)
- return -EAGAIN;
- return -ERESTARTSYS;
+ port->flags |= ASYNC_INITIALIZED;
}
-
-/*
- * Based on type of open being done check if it can overlap with any
- * previous opens still in effect. If we are a normal serial device
- * then also we might have to wait for carrier.
- */
- if (!(filp->f_flags & O_NONBLOCK))
- if ((rc = stl_waitcarrier(tty, portp, filp)) != 0)
- return rc;
-
- portp->port.flags |= ASYNC_NORMAL_ACTIVE;
-
- return 0;
+ return tty_port_block_til_ready(port, tty, filp);
}

/*****************************************************************************/
@@ -794,60 +771,11 @@ static int stl_carrier_raised(struct tty_port *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...
- */
-
-static int stl_waitcarrier(struct tty_struct *tty, struct stlport *portp,
- struct file *filp)
+static void stl_raise_dtr_rts(struct tty_port *port)
{
- unsigned long flags;
- int rc, doclocal;
- struct tty_port *port = &portp->port;
-
- pr_debug("stl_waitcarrier(portp=%p,filp=%p)\n", portp, filp);
-
- rc = 0;
- doclocal = 0;
-
- spin_lock_irqsave(&stallion_lock, flags);
-
- if (tty->termios->c_cflag & CLOCAL)
- doclocal++;
-
- portp->openwaitcnt++;
- if (! tty_hung_up_p(filp))
- port->count--;
-
- for (;;) {
- /* Takes brd_lock internally */
- stl_setsignals(portp, 1, 1);
- if (tty_hung_up_p(filp) ||
- ((port->flags & ASYNC_INITIALIZED) == 0)) {
- if (port->flags & ASYNC_HUP_NOTIFY)
- rc = -EBUSY;
- else
- rc = -ERESTARTSYS;
- break;
- }
- if (((port->flags & ASYNC_CLOSING) == 0) &&
- (doclocal || tty_port_carrier_raised(port)))
- break;
- if (signal_pending(current)) {
- rc = -ERESTARTSYS;
- break;
- }
- /* FIXME */
- interruptible_sleep_on(&port->open_wait);
- }
-
- if (! tty_hung_up_p(filp))
- port->count++;
- portp->openwaitcnt--;
- spin_unlock_irqrestore(&stallion_lock, flags);
-
- return rc;
+ struct stlport *portp = container_of(port, struct stlport, port);
+ /* Takes brd_lock internally */
+ stl_setsignals(portp, 1, 1);
}

/*****************************************************************************/
@@ -899,6 +827,7 @@ static void stl_waituntilsent(struct tty_struct *tty, int timeout)
static void stl_close(struct tty_struct *tty, struct file *filp)
{
struct stlport *portp;
+ struct tty_port *port;
unsigned long flags;

pr_debug("stl_close(tty=%p,filp=%p)\n", tty, filp);
@@ -906,21 +835,22 @@ static void stl_close(struct tty_struct *tty, struct file *filp)
portp = tty->driver_data;
if (portp == NULL)
return;
+ port = &portp->port;

- spin_lock_irqsave(&stallion_lock, flags);
+ spin_lock_irqsave(&port->lock, flags);
if (tty_hung_up_p(filp)) {
- spin_unlock_irqrestore(&stallion_lock, flags);
+ spin_unlock_irqrestore(&port->lock, flags);
return;
}
- if ((tty->count == 1) && (portp->port.count != 1))
- portp->port.count = 1;
- if (portp->port.count-- > 1) {
- spin_unlock_irqrestore(&stallion_lock, flags);
+ if (tty->count == 1 && port->count != 1)
+ port->count = 1;
+ if (port->count-- > 1) {
+ spin_unlock_irqrestore(&port->lock, flags);
return;
}

- portp->port.count = 0;
- portp->port.flags |= ASYNC_CLOSING;
+ port->count = 0;
+ port->flags |= ASYNC_CLOSING;

/*
* May want to wait for any data to drain before closing. The BUSY
@@ -930,16 +860,16 @@ static void stl_close(struct tty_struct *tty, struct file *filp)
*/
tty->closing = 1;

- spin_unlock_irqrestore(&stallion_lock, flags);
+ spin_unlock_irqrestore(&port->lock, flags);

if (portp->closing_wait != ASYNC_CLOSING_WAIT_NONE)
tty_wait_until_sent(tty, portp->closing_wait);
stl_waituntilsent(tty, (HZ / 2));

- spin_lock_irqsave(&stallion_lock, flags);
+ spin_lock_irqsave(&port->lock, flags);
portp->port.flags &= ~ASYNC_INITIALIZED;
- spin_unlock_irqrestore(&stallion_lock, flags);
+ spin_unlock_irqrestore(&port->lock, flags);

stl_disableintrs(portp);
if (tty->termios->c_cflag & HUPCL)
@@ -957,16 +887,16 @@ static void stl_close(struct tty_struct *tty, struct file *filp)
tty_ldisc_flush(tty);

tty->closing = 0;
- tty_port_tty_set(&portp->port, NULL);
+ tty_port_tty_set(port, NULL);

- if (portp->openwaitcnt) {
+ if (port->blocked_open) {
if (portp->close_delay)
msleep_interruptible(jiffies_to_msecs(portp->close_delay));
wake_up_interruptible(&portp->port.open_wait);
}

portp->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
- wake_up_interruptible(&portp->port.close_wait);
+ wake_up_interruptible(&port->close_wait);
}

/*****************************************************************************/
@@ -1414,14 +1344,20 @@ static void stl_stop(struct tty_struct *tty)
static void stl_hangup(struct tty_struct *tty)
{
struct stlport *portp;
+ struct tty_port *port;
+ unsigned long flags;

pr_debug("stl_hangup(tty=%p)\n", tty);

portp = tty->driver_data;
if (portp == NULL)
return;
+ port = &portp->port;
+
+ spin_lock_irqsave(&port->lock, flags);
+ port->flags &= ~ASYNC_INITIALIZED;
+ spin_unlock_irqrestore(&port->lock, flags);

- portp->port.flags &= ~ASYNC_INITIALIZED;
stl_disableintrs(portp);
if (tty->termios->c_cflag & HUPCL)
stl_setsignals(portp, 0, 0);
@@ -1435,10 +1371,7 @@ static void stl_hangup(struct tty_struct *tty)
portp->tx.head = NULL;
portp->tx.tail = NULL;
}
- tty_port_tty_set(&portp->port, NULL);
- portp->port.flags &= ~ASYNC_NORMAL_ACTIVE;
- portp->port.count = 0;
- wake_up_interruptible(&portp->port.open_wait);
+ tty_port_hangup(port);
}

/*****************************************************************************/
@@ -2671,6 +2604,7 @@ static const struct tty_operations stl_ops = {

static const struct tty_port_operations stl_port_ops = {
.carrier_raised = stl_carrier_raised,
+ .raise_dtr_rts = stl_raise_dtr_rts,
};

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