diff options
| author | Ji-Ze Hong (Peter Hong) <hpeter@gmail.com> | 2020-01-30 13:47:48 +0800 |
|---|---|---|
| committer | Johan Hovold <johan@kernel.org> | 2020-02-25 12:30:02 +0100 |
| commit | 98405f81036d64b4aec770df9850352c7d6e4db5 (patch) | |
| tree | 8b0cec06ea056b7c589544e11302a7ca270e9128 /drivers/usb/serial | |
| parent | 1afd37c6a335369a7927c732a93c0558b64e40bb (diff) | |
USB: serial: f81232: add tx_empty function
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>
Diffstat (limited to 'drivers/usb/serial')
| -rw-r--r-- | drivers/usb/serial/f81232.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c index c07d376c743d..793d0b30e347 100644 --- a/drivers/usb/serial/f81232.c +++ b/drivers/usb/serial/f81232.c @@ -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, |