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serial: add port helpers 

We can make this the same as the ones that will be needed by the tty_port
helper logic that we want to move to but still call them from the existing
code base.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Cox 2010-06-01 22:52:58 +02:00 committed by Greg Kroah-Hartman
parent 61cd8a21d8
commit de0c8cb314
1 changed files with 37 additions and 14 deletions
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51
drivers/serial/serial_core.c
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@ -1501,6 +1501,34 @@ static void uart_update_termios(struct tty_struct *tty,
}
}
static int uart_carrier_raised(struct tty_port *port)
{
struct uart_state *state = container_of(port, struct uart_state, port);
struct uart_port *uport = state->uart_port;
int mctrl;
mutex_lock(&port->mutex);
spin_lock_irq(&uport->lock);
uport->ops->enable_ms(uport);
mctrl = uport->ops->get_mctrl(uport);
spin_unlock_irq(&uport->lock);
mutex_unlock(&port->mutex);
if (mctrl & TIOCM_CAR)
return 1;
return 0;
}
static void uart_dtr_rts(struct tty_port *port, int onoff)
{
struct uart_state *state = container_of(port, struct uart_state, port);
struct uart_port *uport = state->uart_port;
mutex_lock(&port->mutex);
if (onoff)
uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS);
else
uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS);
mutex_unlock(&port->mutex);
}
/*
* Block the open until the port is ready. We must be called with
* the per-port semaphore held.
@ -1509,9 +1537,7 @@ static int
uart_block_til_ready(struct file *filp, struct uart_state *state)
{
DECLARE_WAITQUEUE(wait, current);
struct uart_port *uport = state->uart_port;
struct tty_port *port = &state->port;
unsigned int mctrl;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
@ -1555,23 +1581,14 @@ uart_block_til_ready(struct file *filp, struct uart_state *state)
* not set RTS here - we want to make sure we catch
* the data from the modem.
*/
if (port->tty->termios->c_cflag & CBAUD) {
mutex_lock(&port->mutex);
uart_set_mctrl(uport, TIOCM_DTR);
mutex_unlock(&port->mutex);
}
if (port->tty->termios->c_cflag & CBAUD)
tty_port_raise_dtr_rts(port);
/*
* and wait for the carrier to indicate that the
* modem is ready for us.
*/
mutex_lock(&port->mutex);
spin_lock_irq(&uport->lock);
uport->ops->enable_ms(uport);
mctrl = uport->ops->get_mctrl(uport);
spin_unlock_irq(&uport->lock);
mutex_unlock(&port->mutex);
if (mctrl & TIOCM_CAR)
if (tty_port_carrier_raised(port))
break;
schedule();
@ -2349,6 +2366,11 @@ static const struct tty_operations uart_ops = {
#endif
};
static const struct tty_port_operations uart_port_ops = {
.carrier_raised = uart_carrier_raised,
.dtr_rts = uart_dtr_rts,
};
/**
* uart_register_driver - register a driver with the uart core layer
* @drv: low level driver structure
@ -2405,6 +2427,7 @@ int uart_register_driver(struct uart_driver *drv)
struct tty_port *port = &state->port;
tty_port_init(port);
port->ops = &uart_port_ops;
port->close_delay = 500; /* .5 seconds */
port->closing_wait = 30000; /* 30 seconds */
tasklet_init(&state->tlet, uart_tasklet_action,