On Fri, Dec 09, 2016 at 01:39:33PM +0800, Ji-Ze Hong (Peter Hong) wrote:
> Implement Fintek F81232 break on/off with LCR register,
> it's the same with 16550A LCR register layout.
>
> Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@xxxxxxxxx>
> ---
> drivers/usb/serial/f81232.c | 40 ++++++++++++++++++++++++++++++++++------
> 1 file changed, 34 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
> index 972f5a5..d45a70e 100644
> --- a/drivers/usb/serial/f81232.c
> +++ b/drivers/usb/serial/f81232.c
> @@ -131,6 +131,21 @@ static int f81232_set_register(struct usb_serial_port *port, u16 reg, u8 val)
> return status;
> }
>
> +static int f81232_set_mask_register(struct usb_serial_port *port, u16 reg,
> + u8 mask, u8 val)
> +{
> + int status;
> + u8 tmp;
> +
> + status = f81232_get_register(port, reg, &tmp);
> + if (status)
> + return status;
> +
> + tmp = (tmp & ~mask) | (val & mask);
> +
> + return f81232_set_register(port, reg, tmp);
> +}
> +
> static void f81232_read_msr(struct usb_serial_port *port)
> {
> int status;
> @@ -335,15 +350,27 @@ static void f81232_process_read_urb(struct urb *urb)
> tty_flip_buffer_push(&port->port);
> }
>
> +static void f81232_set_break(struct usb_serial_port *port, bool enable)
> +{
> + int status;
> + u8 tmp = 0;
> +
> + if (enable)
> + tmp = UART_LCR_SBC;
> +
> + status = f81232_set_mask_register(port, LINE_CONTROL_REGISTER,
> + UART_LCR_SBC, tmp);
> + if (status) {
> + dev_err(&port->dev, "%s: set break failed: %x\n", __func__,
You want %d here.
And you can drop the __func__ prefix.
> + status);
> + }
You should also coordinate this with the LCR update in set_termios,
otherwise changing line settings would clear break etc.
> +}
> +
> static void f81232_break_ctl(struct tty_struct *tty, int break_state)
> {
> - /* FIXME - Stubbed out for now */
> + struct usb_serial_port *port = tty->driver_data;
>
> - /*
> - * break_state = -1 to turn on break, and 0 to turn off break
> - * see drivers/char/tty_io.c to see it used.
> - * last_set_data_urb_value NEVER has the break bit set in it.
> - */
> + f81232_set_break(port, break_state);
> }
>
> static void f81232_set_baudrate(struct usb_serial_port *port, speed_t baudrate)
> @@ -563,6 +590,7 @@ 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);
> + f81232_set_break(port, false);
I don't think this is needed, and then you can fold set_break into
break_ctl above as well.
> }
>
> static void f81232_dtr_rts(struct usb_serial_port *port, int on)
Thanks,
Johan
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