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Subject[PATCH V2 2/7] USB: serial: f81232: Add tx_empty function
Date
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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