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TTY: amiserial, provide carrier helpers 

This is a preparation for a switch to tty_port_block_til_ready. We
need amiga_carrier_raised and amiga_dtr_rts. The implementation is
taken from startup, shutdown and current block_til_ready.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Jiri Slaby 2012-03-05 14:52:46 +01:00 committed by Greg Kroah-Hartman
parent 6fe18d26b1
commit f1166604f5
1 changed files with 29 additions and 4 deletions
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33
drivers/tty/amiserial.c
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@ -1623,10 +1623,8 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
local_irq_restore(flags);
port->blocked_open++;
while (1) {
local_irq_save(flags);
if (tty->termios->c_cflag & CBAUD)
rtsdtr_ctrl(SER_DTR|SER_RTS);
local_irq_restore(flags);
tty_port_raise_dtr_rts(port);
set_current_state(TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp) ||
!(port->flags & ASYNC_INITIALIZED)) {
@ -1641,7 +1639,7 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
break;
}
if (!(port->flags & ASYNC_CLOSING) &&
(do_clocal || (!(ciab.pra & SER_DCD)) ))
(do_clocal || tty_port_carrier_raised(port)))
break;
if (signal_pending(current)) {
retval = -ERESTARTSYS;
@ -1849,6 +1847,32 @@ static const struct tty_operations serial_ops = {
.proc_fops = &rs_proc_fops,
};
static int amiga_carrier_raised(struct tty_port *port)
{
return !(ciab.pra & SER_DCD);
}
static void amiga_dtr_rts(struct tty_port *port, int raise)
{
struct serial_state *info = container_of(port, struct serial_state,
tport);
unsigned long flags;
if (raise)
info->MCR |= SER_DTR|SER_RTS;
else
info->MCR &= ~(SER_DTR|SER_RTS);
local_irq_save(flags);
rtsdtr_ctrl(info->MCR);
local_irq_restore(flags);
}
static const struct tty_port_operations amiga_port_ops = {
.carrier_raised = amiga_carrier_raised,
.dtr_rts = amiga_dtr_rts,
};
/*
* The serial driver boot-time initialization code!
*/
@ -1891,6 +1915,7 @@ static int __init amiga_serial_probe(struct platform_device *pdev)
state->icount.frame = state->icount.parity = 0;
state->icount.overrun = state->icount.brk = 0;
tty_port_init(&state->tport);
state->tport.ops = &amiga_port_ops;
printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");