On Fri, Jan 30, 2015 at 02:13:38PM +0800, Peter Hung wrote:
> The F81232 bulk-in is RX data channel. Data format is
> [LSR+Data][LSR+Data]..... , We had reimplemented in this patch.
>
> Signed-off-by: Peter Hung <hpeter+linux_ker...@gmail.com>
> ---
> drivers/usb/serial/f81232.c | 47
> +++++++++++++++------------------------------
> 1 file changed, 15 insertions(+), 32 deletions(-)
>
> diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
> index 274120d..12e1ae4 100644
> --- a/drivers/usb/serial/f81232.c
> +++ b/drivers/usb/serial/f81232.c
> @@ -194,47 +194,30 @@ exit:
> static void f81232_process_read_urb(struct urb *urb)
> {
> struct usb_serial_port *port = urb->context;
> - struct f81232_private *priv = usb_get_serial_port_data(port);
> unsigned char *data = urb->transfer_buffer;
> char tty_flag = TTY_NORMAL;
> - unsigned long flags;
> - u8 line_status;
> + u8 line_status = 0;
> int i;
>
> - /* update line status */
> - spin_lock_irqsave(&priv->lock, flags);
> - line_status = priv->line_status;
> - priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
> - spin_unlock_irqrestore(&priv->lock, flags);
> -
> if (!urb->actual_length)
> return;
>
> - /* break takes precedence over parity, */
> - /* which takes precedence over framing errors */
> - if (line_status & UART_BREAK_ERROR)
> - tty_flag = TTY_BREAK;
> - else if (line_status & UART_PARITY_ERROR)
> - tty_flag = TTY_PARITY;
> - else if (line_status & UART_FRAME_ERROR)
> - tty_flag = TTY_FRAME;
> - dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__, tty_flag);
> -
> - /* overrun is special, not associated with a char */
> - if (line_status & UART_OVERRUN_ERROR)
> - tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
> -
> - if (port->port.console && port->sysrq) {
> - for (i = 0; i < urb->actual_length; ++i)
> - if (!usb_serial_handle_sysrq_char(port, data[i]))
> - tty_insert_flip_char(&port->port, data[i],
> - tty_flag);
> - } else {
> - tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
> - urb->actual_length);
> + /* bulk-in data: [LSR(1Byte)+DATA(1Byte)][LSR(1Byte)+DATA(1Byte)]... */
> +
> + if (urb->actual_length >= 2) {
Just return unless length < 2 and reduce indentation below.
Should should probably make sure the returned length is even as well.
> +
> + for (i = 0 ; i < urb->actual_length ; i += 2) {
> + line_status |= data[i+0];
> + tty_insert_flip_string_fixed_flag(&port->port,
> + &data[i+1], tty_flag, 1);
> + }
> +
> + if (unlikely(line_status & UART_LSR_OE))
> + tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
This needs some more work as you need to determine tty_flag for each
character based on the line status using the priorities that you remove
above (i.e. break takes precedence over parity, etc).
Also insert a overrun char for every individual overrun error.
> +
> + tty_flip_buffer_push(&port->port);
> }
>
> - tty_flip_buffer_push(&port->port);
> }
>
> static int set_control_lines(struct usb_device *dev, u8 value)
Johan
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