USB: pl2303: clean up type handling

Merge types 0 and 1, whose differences are unknown and have always been
treated the same.
Add TYPE_-prefix to both types.
Test for TYPE_01 (rather than !TYPE_HX) for legacy device quirks.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 15 insertions, 16 deletions

diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index 40f7b80b3601..52f0c96cd98d 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -129,9 +129,8 @@ MODULE_DEVICE_TABLE(usb, id_table);
 
 
 enum pl2303_type {
-        type_0,         /* don't know the difference between type 0 and */
-        type_1,         /* type 1, until someone from prolific tells us... */
-        HX,             /* HX version of the pl2303 chip */
+        TYPE_01,        /* Type 0 and 1 (difference unknown) */
+        TYPE_HX,        /* HX version of the pl2303 chip */
 };
 
 struct pl2303_serial_private {
@@ -200,7 +199,7 @@ static int pl2303_probe(struct usb_serial *serial,
 static int pl2303_startup(struct usb_serial *serial)
 {
         struct pl2303_serial_private *spriv;
-        enum pl2303_type type = type_0;
+        enum pl2303_type type = TYPE_01;
         unsigned char *buf;
 
         spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
@@ -214,13 +213,13 @@ static int pl2303_startup(struct usb_serial *serial)
         }
 
         if (serial->dev->descriptor.bDeviceClass == 0x02)
-                type = type_0;
+                type = TYPE_01;         /* type 0 */
         else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
-                type = HX;
+                type = TYPE_HX;
         else if (serial->dev->descriptor.bDeviceClass == 0x00)
-                type = type_1;
+                type = TYPE_01;         /* type 1 */
         else if (serial->dev->descriptor.bDeviceClass == 0xFF)
-                type = type_1;
+                type = TYPE_01;         /* type 1 */
         dev_dbg(&serial->interface->dev, "device type: %d\n", type);
 
         spriv->type = type;
@@ -238,10 +237,10 @@ static int pl2303_startup(struct usb_serial *serial)
         pl2303_vendor_read(serial, 0x8383, buf);
         pl2303_vendor_write(serial, 0, 1);
         pl2303_vendor_write(serial, 1, 0);
-        if (type == HX)
-                pl2303_vendor_write(serial, 2, 0x44);
-        else
+        if (type == TYPE_01)
                 pl2303_vendor_write(serial, 2, 0x24);
+        else
+                pl2303_vendor_write(serial, 2, 0x44);
 
         kfree(buf);
 
@@ -335,7 +334,7 @@ static void pl2303_encode_baudrate(struct tty_struct *tty,
                 baud = baud_sup[i];
 
         /* type_0, type_1 only support up to 1228800 baud */
-        if (spriv->type != HX)
+        if (spriv->type == TYPE_01)
                 baud = min_t(speed_t, baud, 1228800);
 
         if (baud <= 115200) {
@@ -532,10 +531,10 @@ static void pl2303_set_termios(struct tty_struct *tty,
         }
 
         if (C_CRTSCTS(tty)) {
-                if (spriv->type == HX)
-                        pl2303_vendor_write(serial, 0x0, 0x61);
-                else
+                if (spriv->type == TYPE_01)
                         pl2303_vendor_write(serial, 0x0, 0x41);
+                else
+                        pl2303_vendor_write(serial, 0x0, 0x61);
         } else {
                 pl2303_vendor_write(serial, 0x0, 0x0);
         }
@@ -572,7 +571,7 @@ static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
         int result;
 
-        if (spriv->type != HX) {
+        if (spriv->type == TYPE_01) {
                 usb_clear_halt(serial->dev, port->write_urb->pipe);
                 usb_clear_halt(serial->dev, port->read_urb->pipe);
         } else {