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

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Message-Id: <1253396244-7885-24-git-send-email-gregkh@suse.de>
Date:	Sat, 19 Sep 2009 14:36:29 -0700
From:	Greg Kroah-Hartman <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org
Cc:	Kees Schoenmakers <k.schoenmakers@...mae.nl>,
	Alan Cox <alan@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 24/79] tty: usb_serial_mos7720: Fix get_lsr_info

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;
-- 
1.6.4.2

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