> -----Original Message-----
> From: [email protected] [mailto:linux-usb-
> [email protected]] On Behalf Of Valentin Yakovenkov
> Sent: Tuesday, March 22, 2016 11:12
> To: [email protected]
> Subject: [PATCH] Add DCD line support to CP210x driver
[...]
> static struct usb_serial_driver * const serial_drivers[] = {
> @@ -460,6 +471,11 @@ static int cp210x_open(struct tty_struct *tty, struct
> usb_serial_port *port)
> {
> int result;
>
> + struct usb_serial *serial = port->serial;
> + struct cp210x_serial_private *spriv = usb_get_serial_data(serial);
> +
> + spriv->cp210x_tstate = CP210X_STATE_IDLE;
> +
> result = cp210x_set_config_single(port, CP210X_IFC_ENABLE,
>
> UART_ENABLE);
> if (result) {
> @@ -474,6 +490,15 @@ static int cp210x_open(struct tty_struct *tty, struct
> usb_serial_port *port)
> if (tty)
> cp210x_change_speed(tty, port, NULL);
>
> + /* Enable events embedding to data stream */
> + result = cp210x_set_config_single(port, CP210X_EMBED_EVENTS,
> +
> CP210X_ESCCHAR);
> + if (result) {
> + dev_err(&port->dev, "%s - Unable to enable event
> embedding on UART\n",
> + __func__);
> + return result;
> + }
> +
This unconditionally enables the behavior every time the device is opened.
Instead it needs to be enabled by the application explicitly, otherwise it'll
hurt people who don't except it.
[...]
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