From 5fac329f4bc44c653a1a6595a2832fd6639d681b Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <greg@kroah.com>
Date: Wed, 23 Apr 2003 03:48:48 -0700
Subject: [PATCH] [PATCH] USB: pl2303: add support for new tty tiocmget and
 tiocmset functions.

---
 drivers/usb/serial/pl2303.c | 63 +++++++++++--------------------------
 1 file changed, 19 insertions(+), 44 deletions(-)

diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index b341aad16a6ea..1d3ec53f94a06 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -124,6 +124,9 @@ static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
 static int pl2303_write (struct usb_serial_port *port, int from_user,
 			 const unsigned char *buf, int count);
 static void pl2303_break_ctl(struct usb_serial_port *port,int break_state);
+static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file);
+static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
+			    unsigned int set, unsigned int clear);
 static int pl2303_startup (struct usb_serial *serial);
 static void pl2303_shutdown (struct usb_serial *serial);
 
@@ -143,6 +146,8 @@ static struct usb_serial_device_type pl2303_device = {
 	.ioctl =		pl2303_ioctl,
 	.break_ctl =		pl2303_break_ctl,
 	.set_termios =		pl2303_set_termios,
+	.tiocmget =		pl2303_tiocmget,
+	.tiocmset =		pl2303_tiocmset,
 	.read_bulk_callback =	pl2303_read_bulk_callback,
 	.read_int_callback =	pl2303_read_int_callback,
 	.write_bulk_callback =	pl2303_write_bulk_callback,
@@ -490,51 +495,35 @@ static void pl2303_close (struct usb_serial_port *port, struct file *filp)
 
 }
 
-static int set_modem_info (struct usb_serial_port *port, unsigned int cmd, unsigned int *value)
+static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
+			    unsigned int set, unsigned int clear)
 {
 	struct pl2303_private *priv = usb_get_serial_port_data(port);
-	unsigned int arg;
 	u8 control;
 
-	if (copy_from_user(&arg, value, sizeof(int)))
-		return -EFAULT;
-
 	spin_lock (&priv->lock);
-	switch (cmd) {
-		case TIOCMBIS:
-			if (arg & TIOCM_RTS)
-				priv->line_control |= CONTROL_RTS;
-			if (arg & TIOCM_DTR)
-				priv->line_control |= CONTROL_DTR;
-			break;
-
-		case TIOCMBIC:
-			if (arg & TIOCM_RTS)
-				priv->line_control &= ~CONTROL_RTS;
-			if (arg & TIOCM_DTR)
-				priv->line_control &= ~CONTROL_DTR;
-			break;
-
-		case TIOCMSET:
-			/* turn off RTS and DTR and then only turn
-			   on what was asked to */
-			priv->line_control &= ~(CONTROL_RTS | CONTROL_DTR);
-			priv->line_control |= ((arg & TIOCM_RTS) ? CONTROL_RTS : 0);
-			priv->line_control |= ((arg & TIOCM_DTR) ? CONTROL_DTR : 0);
-			break;
-	}
+	if (set & TIOCM_RTS)
+		priv->line_control |= CONTROL_RTS;
+	if (set & TIOCM_DTR)
+		priv->line_control |= CONTROL_DTR;
+	if (clear & TIOCM_RTS)
+		priv->line_control &= ~CONTROL_RTS;
+	if (clear & TIOCM_DTR)
+		priv->line_control &= ~CONTROL_DTR;
 	control = priv->line_control;
 	spin_unlock (&priv->lock);
 
 	return set_control_lines (port->serial->dev, control);
 }
 
-static int get_modem_info (struct usb_serial_port *port, unsigned int *value)
+static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file)
 {
 	struct pl2303_private *priv = usb_get_serial_port_data(port);
 	unsigned int mcr;
 	unsigned int result;
 
+	dbg("%s (%d)", __FUNCTION__, port->number);
+
 	spin_lock (&priv->lock);
 	mcr = priv->line_control;
 	spin_unlock (&priv->lock);
@@ -544,9 +533,7 @@ static int get_modem_info (struct usb_serial_port *port, unsigned int *value)
 
 	dbg("%s - result = %x", __FUNCTION__, result);
 
-	if (copy_to_user(value, &result, sizeof(int)))
-		return -EFAULT;
-	return 0;
+	return result;
 }
 
 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg)
@@ -554,17 +541,6 @@ static int pl2303_ioctl (struct usb_serial_port *port, struct file *file, unsign
 	dbg("%s (%d) cmd = 0x%04x", __FUNCTION__, port->number, cmd);
 
 	switch (cmd) {
-		
-		case TIOCMGET:
-			dbg("%s (%d) TIOCMGET", __FUNCTION__, port->number);
-			return get_modem_info (port, (unsigned int *)arg);
-
-		case TIOCMBIS:
-		case TIOCMBIC:
-		case TIOCMSET:
-			dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __FUNCTION__,  port->number);
-			return set_modem_info(port, cmd, (unsigned int *) arg);
-
 		default:
 			dbg("%s not supported = 0x%04x", __FUNCTION__, cmd);
 			break;
@@ -573,7 +549,6 @@ static int pl2303_ioctl (struct usb_serial_port *port, struct file *file, unsign
 	return -ENOIOCTLCMD;
 }
 
-
 static void pl2303_break_ctl (struct usb_serial_port *port, int break_state)
 {
 	struct usb_serial *serial = port->serial;
-- 
2.53.0