[PATCH V5 3/8] USB: f81232: implement RX bulk-in ep

[Peter Hung <hpeter@gmail.com>]

The F81232 bulk-in is RX data + LSR channel, data format is
[LSR+Data][LSR+Data]..... , We had reimplemented in this patch.

Signed-off-by: Peter Hung <hpeter+linux_kernel@gmail.com>
---
 drivers/usb/serial/f81232.c | 68 +++++++++++++++++++++++----------------------
 1 file changed, 35 insertions(+), 33 deletions(-)

diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
index ec4609d..9ea498a 100644
--- a/drivers/usb/serial/f81232.c
+++ b/drivers/usb/serial/f81232.c
@@ -185,44 +185,46 @@ 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;
+	char tty_flag;
 	int i;
 
-	/* update line status */
-	spin_lock_irqsave(&priv->lock, flags);
-	line_status = priv->modem_status;
-	priv->modem_status &= ~UART_STATE_TRANSIENT_MASK;
-	spin_unlock_irqrestore(&priv->lock, flags);
-
-	if (!urb->actual_length)
+	if (urb->actual_length < 2)
 		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)]... */
+
+	for (i = 0 ; i < urb->actual_length ; i += 2) {
+		tty_flag = TTY_NORMAL;
+
+		if (unlikely(data[i+0] & UART_LSR_BRK_ERROR_BITS)) {
+			if (data[i+0] & UART_LSR_BI) {
+				tty_flag = TTY_BREAK;
+				port->icount.brk++;
+				usb_serial_handle_break(port);
+			} else if (data[i+0] & UART_LSR_PE) {
+				tty_flag = TTY_PARITY;
+				port->icount.parity++;
+			} else if (data[i+0] & UART_LSR_FE) {
+				tty_flag = TTY_FRAME;
+				port->icount.frame++;
+			}
+
+			if (data[0] & UART_LSR_OE) {
+				port->icount.overrun++;
+				tty_insert_flip_char(&port->port, 0,
+					TTY_OVERRUN);
+			}
+		}
+
+		if (port->port.console && port->sysrq) {
+			if (!usb_serial_handle_sysrq_char(port, data[i+1]))
+				tty_insert_flip_char(&port->port, data[i+1],
+					tty_flag);
+		} else {
+			tty_insert_flip_string_fixed_flag(&port->port,
+				&data[i+1], tty_flag, 1);
+		}
 	}
 
 	tty_flip_buffer_push(&port->port);
-- 
1.9.1