linux-kernel - Re: [PATCH 24/79] tty: usb_serial_mos7720: Fix get_lsr

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Message-Id: <201001261209.48204.k.schoenmakers@sigmae.nl>
Date:	Tue, 26 Jan 2010 12:09:48 +0100
From:	Kees Schoenmakers <k.schoenmakers@...mae.nl>
To:	"Greg Kroah-Hartman" <gregkh@...e.de>
Cc:	linux-kernel@...r.kernel.org, Alan Cox <alan@...ux.intel.com>
Subject: Re: [PATCH 24/79] tty: usb_serial_mos7720: Fix get_lsr_info

Gentlemen,

Drop my previous email, it has the wrong subject

kind regards

Kees

On Saturday 19 September 2009 23:36:29 Greg Kroah-Hartman wrote:
> From: Kees Schoenmakers <k.schoenmakers@...mae.nl>
>
> I made a correction for get_lsr_info, now it returns some meaningful
> information. I tested it with two simultaneous simplex modem channels.
>
> it is attached
>
> Signed-off-by: Kees Schoenmakers <k.schoenmakers@...mae.nl>
> Signed-off-by: Alan Cox <alan@...ux.intel.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
> ---
>  drivers/usb/serial/mos7720.c |   19 +++++++++++++++----
>  1 files changed, 15 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c
> index 759cdd5..4342a8a 100644
> --- a/drivers/usb/serial/mos7720.c
> +++ b/drivers/usb/serial/mos7720.c
> @@ -378,10 +378,14 @@ static int mos7720_open(struct tty_struct *tty,
>  	 /* Initialize MCS7720 -- Write Init values to corresponding Registers
>  	  *
>  	  * Register Index
> +	  * 0 : THR/RHR
>  	  * 1 : IER
>  	  * 2 : FCR
>  	  * 3 : LCR
>  	  * 4 : MCR
> +	  * 5 : LSR
> +	  * 6 : MSR
> +	  * 7 : SPR
>  	  *
>  	  * 0x08 : SP1/2 Control Reg
>  	  */
> @@ -1250,15 +1254,22 @@ static void mos7720_set_termios(struct tty_struct
> *tty, static int get_lsr_info(struct tty_struct *tty,
>  		struct moschip_port *mos7720_port, unsigned int __user *value)
>  {
> -	int count;
> +	struct usb_serial_port *port = tty->driver_data;
>  	unsigned int result = 0;
> +	unsigned char data = 0;
> +	int port_number = port->number - port->serial->minor;
> +	int count;
>
>  	count = mos7720_chars_in_buffer(tty);
>  	if (count == 0) {
> -		dbg("%s -- Empty", __func__);
> -		result = TIOCSER_TEMT;
> +		send_mos_cmd(port->serial, MOS_READ, port_number,
> +							UART_LSR, &data);
> +		if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
> +					== (UART_LSR_TEMT | UART_LSR_THRE)) {
> +			dbg("%s -- Empty", __func__);
> +			result = TIOCSER_TEMT;
> +		}
>  	}
> -
>  	if (copy_to_user(value, &result, sizeof(int)))
>  		return -EFAULT;
>  	return 0;



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