USB: pl2303: initial TIOCGSERIAL support

I've got a trivial patch for the pl2303 driver, that's what I needed to
make the wacom serial tablet driver work properly. It uses the
TIOCGSERIAL ioctl to determine if it's talking to a serial device or
not, which I gather is rather common, but the pl2303 driver didn't
implement that ioctl.

Here's a patch, I'm not sure it's absolutely correct, I mostly looked at
other similar usbserial drivers to see what I must do, but it works for
me.

Signed-off-by: John Tsiombikas <nuclear@member.fsf.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index 571dcf182866..895d0722183e 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -895,10 +895,23 @@ static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
 static int pl2303_ioctl(struct tty_struct *tty, struct file *file,
                         unsigned int cmd, unsigned long arg)
 {
+        struct serial_struct ser;
         struct usb_serial_port *port = tty->driver_data;
         dbg("%s (%d) cmd = 0x%04x", __func__, port->number, cmd);
 
         switch (cmd) {
+        case TIOCGSERIAL:
+                memset(&ser, 0, sizeof ser);
+                ser.type = PORT_16654;
+                ser.line = port->serial->minor;
+                ser.port = port->number;
+                ser.baud_base = 460800;
+
+                if (copy_to_user((void __user *)arg, &ser, sizeof ser))
+                        return -EFAULT;
+
+                return 0;
+
         case TIOCMIWAIT:
                 dbg("%s (%d) TIOCMIWAIT", __func__,  port->number);
                 return wait_modem_info(port, arg);