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USB: f81232: implement port enable/disable method

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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>
This commit is contained in:
Peter Hung 2015-03-17 17:48:24 +08:00 committed by Johan Hovold
parent 691545fd92
commit 94f87309fb
1 changed files with 49 additions and 0 deletions
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49
drivers/usb/serial/f81232.c
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@ -37,6 +37,8 @@ MODULE_DEVICE_TABLE(usb, id_table);
#define F81232_SET_REGISTER 0x40 #define F81232_SET_REGISTER 0x40
#define SERIAL_BASE_ADDRESS 0x0120 #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_CONTROL_REGISTER (0x04 + SERIAL_BASE_ADDRESS)
#define MODEM_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS) #define MODEM_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS)
@ -348,6 +350,48 @@ static void f81232_break_ctl(struct tty_struct *tty, int break_state)
*/ */
} }
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, static void f81232_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old_termios) struct usb_serial_port *port, struct ktermios *old_termios)
{ {
@ -399,6 +443,10 @@ static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port)
{ {
int result; int result;
result = f81232_port_enable(port);
if (result)
return result;
/* Setup termios */ /* Setup termios */
if (tty) if (tty)
f81232_set_termios(tty, port, NULL); f81232_set_termios(tty, port, NULL);
@ -421,6 +469,7 @@ static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port)
static void f81232_close(struct usb_serial_port *port) static void f81232_close(struct usb_serial_port *port)
{ {
f81232_port_disable(port);
usb_serial_generic_close(port); usb_serial_generic_close(port);
usb_kill_urb(port->interrupt_in_urb); usb_kill_urb(port->interrupt_in_urb);
} }