USB: f81232: implement port enable/disable method
We put FCR/IER initial step to f81232_port_enable()/f81232_port_disable().
When port is open, it set MSR interrupt on. Otherwise set it off.
Signed-off-by: Peter Hung <hpeter+linux_kernel@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
index 307e147..9602823 100644
--- a/drivers/usb/serial/f81232.c
+++ b/drivers/usb/serial/f81232.c
@@ -37,6 +37,8 @@
#define F81232_SET_REGISTER 0x40
#define SERIAL_BASE_ADDRESS 0x0120
+#define INTERRUPT_ENABLE_REGISTER (0x01 + SERIAL_BASE_ADDRESS)
+#define FIFO_CONTROL_REGISTER (0x02 + SERIAL_BASE_ADDRESS)
#define MODEM_CONTROL_REGISTER (0x04 + SERIAL_BASE_ADDRESS)
#define MODEM_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS)
@@ -348,6 +350,48 @@
*/
}
+static int f81232_port_enable(struct usb_serial_port *port)
+{
+ u8 val;
+ int status;
+
+ /* fifo on, trigger8, clear TX/RX*/
+ val = UART_FCR_TRIGGER_8 | UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
+ UART_FCR_CLEAR_XMIT;
+
+ status = f81232_set_register(port, FIFO_CONTROL_REGISTER, val);
+ if (status) {
+ dev_err(&port->dev, "%s failed to set FCR: %d\n",
+ __func__, status);
+ return status;
+ }
+
+ /* MSR Interrupt only, LSR will read from Bulk-in odd byte */
+ status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
+ UART_IER_MSI);
+ if (status) {
+ dev_err(&port->dev, "%s failed to set IER: %d\n",
+ __func__, status);
+ return status;
+ }
+
+ return 0;
+}
+
+static int f81232_port_disable(struct usb_serial_port *port)
+{
+ int status;
+
+ status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER, 0);
+ if (status) {
+ dev_err(&port->dev, "%s failed to set IER: %d\n",
+ __func__, status);
+ return status;
+ }
+
+ return 0;
+}
+
static void f81232_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old_termios)
{
@@ -399,6 +443,10 @@
{
int result;
+ result = f81232_port_enable(port);
+ if (result)
+ return result;
+
/* Setup termios */
if (tty)
f81232_set_termios(tty, port, NULL);
@@ -421,6 +469,7 @@
static void f81232_close(struct usb_serial_port *port)
{
+ f81232_port_disable(port);
usb_serial_generic_close(port);
usb_kill_urb(port->interrupt_in_urb);
}