Messages in this thread Patch in this message | | | From | "Ji-Ze Hong (Peter Hong)" <> | Subject | [PATCH V2 2/7] USB: serial: f81232: Add tx_empty function | Date | Mon, 23 Sep 2019 10:24:44 +0800 |
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Add tx_empty() function for F81232.
Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@gmail.com> --- drivers/usb/serial/f81232.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c index c07d376c743d..b42b3738a768 100644 --- a/drivers/usb/serial/f81232.c +++ b/drivers/usb/serial/f81232.c @@ -685,6 +685,23 @@ 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) { + dev_err(&port->dev, "get LSR status failed: %d\n", status); + return false; + } + + 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 +837,7 @@ 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, -- 2.17.1
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