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USB: serial: f81232: add tx_empty function

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Add tx_empty() function for F81232. Without this, console redirection will
get garbage data.

Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Ji-Ze Hong (Peter Hong) 2020-01-30 13:47:48 +08:00 committed by Johan Hovold
parent 1afd37c6a3
commit 98405f8103
1 changed files with 15 additions and 0 deletions
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15
drivers/usb/serial/f81232.c
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@ -685,6 +685,20 @@ static void f81232_dtr_rts(struct usb_serial_port *port, int on)
f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
}
static bool f81232_tx_empty(struct usb_serial_port *port)
{
int status;
u8 tmp;
status = f81232_get_register(port, LINE_STATUS_REGISTER, &tmp);
if (!status) {
if ((tmp & UART_LSR_TEMT) != UART_LSR_TEMT)
return false;
}
return true;
}
static int f81232_carrier_raised(struct usb_serial_port *port)
{
u8 msr;
@ -820,6 +834,7 @@ static struct usb_serial_driver f81232_device = {
.tiocmget = f81232_tiocmget,
.tiocmset = f81232_tiocmset,
.tiocmiwait = usb_serial_generic_tiocmiwait,
.tx_empty = f81232_tx_empty,
.process_read_urb = f81232_process_read_urb,
.read_int_callback = f81232_read_int_callback,
.port_probe = f81232_port_probe,