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>
diff --git a/drivers/char/rocket.c b/drivers/char/rocket.c
index 584d791..4a4110e 100644
--- a/drivers/char/rocket.c
+++ b/drivers/char/rocket.c
@@ -135,6 +135,7 @@
static int is_PCI[NUM_BOARDS];
static rocketModel_t rocketModel[NUM_BOARDS];
static int max_board;
+static const struct tty_port_operations rocket_port_ops;
/*
* The following arrays define the interrupt bits corresponding to each AIOP.
@@ -649,9 +650,8 @@
info->board = board;
info->aiop = aiop;
info->chan = chan;
- info->port.closing_wait = 3000;
- info->port.close_delay = 50;
- init_waitqueue_head(&info->port.open_wait);
+ tty_port_init(&info->port);
+ info->port.ops = &rocket_port_ops;
init_completion(&info->close_wait);
info->flags &= ~ROCKET_MODE_MASK;
switch (pc104[board][line]) {
@@ -864,11 +864,18 @@
}
}
+static int carrier_raised(struct tty_port *port)
+{
+ struct r_port *info = container_of(port, struct r_port, port);
+ return (sGetChanStatusLo(&info->channel) & CD_ACT) ? 1 : 0;
+}
+
/* info->port.count is considered critical, protected by spinlocks. */
static int block_til_ready(struct tty_struct *tty, struct file *filp,
struct r_port *info)
{
DECLARE_WAITQUEUE(wait, current);
+ struct tty_port *port = &info->port;
int retval;
int do_clocal = 0, extra_count = 0;
unsigned long flags;
@@ -898,13 +905,13 @@
/*
* Block waiting for the carrier detect and the line to become free. While we are in
- * this loop, info->port.count is dropped by one, so that rp_close() knows when to free things.
+ * this loop, port->count is dropped by one, so that rp_close() knows when to free things.
* We restore it upon exit, either normal or abnormal.
*/
retval = 0;
- add_wait_queue(&info->port.open_wait, &wait);
+ add_wait_queue(&port->open_wait, &wait);
#ifdef ROCKET_DEBUG_OPEN
- printk(KERN_INFO "block_til_ready before block: ttyR%d, count = %d\n", info->line, info->port.count);
+ printk(KERN_INFO "block_til_ready before block: ttyR%d, count = %d\n", info->line, port->count);
#endif
spin_lock_irqsave(&info->slock, flags);
@@ -913,10 +920,10 @@
#else
if (!tty_hung_up_p(filp)) {
extra_count = 1;
- info->port.count--;
+ port->count--;
}
#endif
- info->port.blocked_open++;
+ port->blocked_open++;
spin_unlock_irqrestore(&info->slock, flags);
@@ -933,7 +940,8 @@
retval = -ERESTARTSYS;
break;
}
- if (!(info->flags & ROCKET_CLOSING) && (do_clocal || (sGetChanStatusLo(&info->channel) & CD_ACT)))
+ if (!(info->flags & ROCKET_CLOSING) &&
+ (do_clocal || tty_port_carrier_raised(port)))
break;
if (signal_pending(current)) {
retval = -ERESTARTSYS;
@@ -941,24 +949,24 @@
}
#ifdef ROCKET_DEBUG_OPEN
printk(KERN_INFO "block_til_ready blocking: ttyR%d, count = %d, flags=0x%0x\n",
- info->line, info->port.count, info->flags);
+ info->line, port->count, info->flags);
#endif
schedule(); /* Don't hold spinlock here, will hang PC */
}
__set_current_state(TASK_RUNNING);
- remove_wait_queue(&info->port.open_wait, &wait);
+ remove_wait_queue(&port->open_wait, &wait);
spin_lock_irqsave(&info->slock, flags);
if (extra_count)
- info->port.count++;
- info->port.blocked_open--;
+ port->count++;
+ port->blocked_open--;
spin_unlock_irqrestore(&info->slock, flags);
#ifdef ROCKET_DEBUG_OPEN
printk(KERN_INFO "block_til_ready after blocking: ttyR%d, count = %d\n",
- info->line, info->port.count);
+ info->line, port->count);
#endif
if (retval)
return retval;
@@ -2371,6 +2379,10 @@
.tiocmset = rp_tiocmset,
};
+static const struct tty_port_operations rocket_port_ops = {
+ .carrier_raised = carrier_raised,
+};
+
/*
* The module "startup" routine; it's run when the module is loaded.
*/