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Commit 2f9ea55c authored by Kees Schoenmakers's avatar Kees Schoenmakers Committed by Live-CD User
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tty: usb_serial_mos7720: Fix get_lsr_info 



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: default avatarKees Schoenmakers <k.schoenmakers@sigmae.nl>
Signed-off-by: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 0f608f89

drivers/usb/serial/mos7720.c

+15 −4
Original line number Diff line number Diff line
@@ -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) {

		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;