linux-kernel - [PATCH v4 4/7] usb: serial: reimplement RX bulk-in ep for F81232

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Date:	Fri, 30 Jan 2015 14:13:38 +0800
From:	Peter Hung <hpeter@...il.com>
To:	johan@...nel.org
Cc:	gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, tom_tsai@...tek.com.tw,
	peter_hong@...tek.com.tw,
	Peter Hung <hpeter+linux_kernel@...il.com>
Subject: [PATCH v4 4/7] usb: serial: reimplement RX bulk-in ep for F81232

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_kernel@...il.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) {
+
+		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);
+
+		tty_flip_buffer_push(&port->port);
 	}
 
-	tty_flip_buffer_push(&port->port);
 }
 
 static int set_control_lines(struct usb_device *dev, u8 value)
-- 
1.9.1

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