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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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19
drivers/char/ser_a2232.c
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@@ -122,7 +122,7 @@ static void a2232_disable_tx_interrupts(void *ptr);
static void a2232_enable_tx_interrupts(void *ptr);
static void a2232_disable_rx_interrupts(void *ptr);
static void a2232_enable_rx_interrupts(void *ptr);
static int a2232_get_CD(void *ptr);
static int a2232_carrier_raised(struct tty_port *port);
static void a2232_shutdown_port(void *ptr);
static int a2232_set_real_termios(void *ptr);
static int a2232_chars_in_buffer(void *ptr);
@@ -148,7 +148,6 @@ static struct real_driver a2232_real_driver = {
a2232_enable_tx_interrupts,
a2232_disable_rx_interrupts,
a2232_enable_rx_interrupts,
a2232_get_CD,
a2232_shutdown_port,
a2232_set_real_termios,
a2232_chars_in_buffer,
@@ -260,9 +259,10 @@ static void a2232_enable_rx_interrupts(void *ptr)
port->disable_rx = 0;
}
static int a2232_get_CD(void *ptr)
static int a2232_carrier_raised(struct tty_port *port)
{
return ((struct a2232_port *) ptr)->cd_status;
struct a2232_port *ap = container_of(port, struct a2232_port, gs.port);
return ap->cd_status;
}
static void a2232_shutdown_port(void *ptr)
@@ -638,6 +638,10 @@ int ch, err, n, p;
return IRQ_HANDLED;
}
static const struct tty_port_operations a2232_port_ops = {
.carrier_raised = a2232_carrier_raised,
};
static void a2232_init_portstructs(void)
{
struct a2232_port *port;
@@ -645,6 +649,8 @@ static void a2232_init_portstructs(void)
for (i = 0; i < MAX_A2232_BOARDS*NUMLINES; i++) {
port = a2232_ports + i;
tty_port_init(&port->gs.port);
port->gs.port.ops = &a2232_port_ops;
port->which_a2232 = i/NUMLINES;
port->which_port_on_a2232 = i%NUMLINES;
port->disable_rx = port->throttle_input = port->cd_status = 0;
@@ -652,11 +658,6 @@ static void a2232_init_portstructs(void)
port->gs.close_delay = HZ/2;
port->gs.closing_wait = 30 * HZ;
port->gs.rd = &a2232_real_driver;
#ifdef NEW_WRITE_LOCKING
mutex_init(&(port->gs.port_write_mutex));
#endif
init_waitqueue_head(&port->gs.port.open_wait);
init_waitqueue_head(&port->gs.port.close_wait);
}
}