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authorAlan Cox <alan@redhat.com>2009-01-02 13:45:05 +0000
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-02 10:19:38 -0800
commit31f35939d1d9bcfb3099b32c67b896d2792603f9 (patch)
tree39b6ceaf0e7477e0357ff8235814f579adad3f28 /drivers/char/isicom.c
parentc9b3976e3fec266be25c5001a70aa0a890b6c476 (diff)
downloadop-kernel-dev-31f35939d1d9bcfb3099b32c67b896d2792603f9.zip
op-kernel-dev-31f35939d1d9bcfb3099b32c67b896d2792603f9.tar.gz
tty_port: Add a port level carrier detect operation
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>
Diffstat (limited to 'drivers/char/isicom.c')
-rw-r--r--drivers/char/isicom.c51
1 files changed, 32 insertions, 19 deletions
diff --git a/drivers/char/isicom.c b/drivers/char/isicom.c
index 04e4549..b3da485 100644
--- a/drivers/char/isicom.c
+++ b/drivers/char/isicom.c
@@ -830,20 +830,28 @@ static int isicom_setup_port(struct tty_struct *tty)
return 0;
}
+static int isicom_carrier_raised(struct tty_port *port)
+{
+ struct isi_port *ip = container_of(port, struct isi_port, port);
+ return (ip->status & ISI_DCD)?1 : 0;
+}
+
static int block_til_ready(struct tty_struct *tty, struct file *filp,
- struct isi_port *port)
+ struct isi_port *ip)
{
- struct isi_board *card = port->card;
+ struct isi_board *card = ip->card;
+ struct tty_port *port = &ip->port;
int do_clocal = 0, retval;
unsigned long flags;
DECLARE_WAITQUEUE(wait, current);
+ int cd;
/* block if port is in the process of being closed */
- if (tty_hung_up_p(filp) || port->port.flags & ASYNC_CLOSING) {
+ if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
pr_dbg("block_til_ready: close in progress.\n");
- interruptible_sleep_on(&port->port.close_wait);
- if (port->port.flags & ASYNC_HUP_NOTIFY)
+ interruptible_sleep_on(&port->close_wait);
+ if (port->flags & ASYNC_HUP_NOTIFY)
return -EAGAIN;
else
return -ERESTARTSYS;
@@ -854,7 +862,7 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
if ((filp->f_flags & O_NONBLOCK) ||
(tty->flags & (1 << TTY_IO_ERROR))) {
pr_dbg("block_til_ready: non-block mode.\n");
- port->port.flags |= ASYNC_NORMAL_ACTIVE;
+ port->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
@@ -864,29 +872,29 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
/* block waiting for DCD to be asserted, and while
callout dev is busy */
retval = 0;
- add_wait_queue(&port->port.open_wait, &wait);
+ add_wait_queue(&port->open_wait, &wait);
spin_lock_irqsave(&card->card_lock, flags);
if (!tty_hung_up_p(filp))
- port->port.count--;
- port->port.blocked_open++;
+ port->count--;
+ port->blocked_open++;
spin_unlock_irqrestore(&card->card_lock, flags);
while (1) {
- raise_dtr_rts(port);
+ raise_dtr_rts(ip);
set_current_state(TASK_INTERRUPTIBLE);
- if (tty_hung_up_p(filp) || !(port->port.flags & ASYNC_INITIALIZED)) {
- if (port->port.flags & ASYNC_HUP_NOTIFY)
+ if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) {
+ if (port->flags & ASYNC_HUP_NOTIFY)
retval = -EAGAIN;
else
retval = -ERESTARTSYS;
break;
}
- if (!(port->port.flags & ASYNC_CLOSING) &&
- (do_clocal || (port->status & ISI_DCD))) {
+ cd = tty_port_carrier_raised(port);
+ if (!(port->flags & ASYNC_CLOSING) &&
+ (do_clocal || cd))
break;
- }
if (signal_pending(current)) {
retval = -ERESTARTSYS;
break;
@@ -894,15 +902,15 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
schedule();
}
set_current_state(TASK_RUNNING);
- remove_wait_queue(&port->port.open_wait, &wait);
+ remove_wait_queue(&port->open_wait, &wait);
spin_lock_irqsave(&card->card_lock, flags);
if (!tty_hung_up_p(filp))
- port->port.count++;
- port->port.blocked_open--;
+ port->count++;
+ port->blocked_open--;
spin_unlock_irqrestore(&card->card_lock, flags);
if (retval)
return retval;
- port->port.flags |= ASYNC_NORMAL_ACTIVE;
+ port->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
@@ -1452,6 +1460,10 @@ static const struct tty_operations isicom_ops = {
.break_ctl = isicom_send_break,
};
+static const struct tty_port_operations isicom_port_ops = {
+ .carrier_raised = isicom_carrier_raised,
+};
+
static int __devinit reset_card(struct pci_dev *pdev,
const unsigned int card, unsigned int *signature)
{
@@ -1794,6 +1806,7 @@ static int __init isicom_init(void)
spin_lock_init(&isi_card[idx].card_lock);
for (channel = 0; channel < 16; channel++, port++) {
tty_port_init(&port->port);
+ port->port.ops = &isicom_port_ops;
port->magic = ISICOM_MAGIC;
port->card = &isi_card[idx];
port->channel = channel;
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