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Commit 67b9946d authored by John Tsiombikas's avatar John Tsiombikas Committed by Greg Kroah-Hartman
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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: default avatarJohn Tsiombikas <nuclear@member.fsf.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent ac7d4ca9

drivers/usb/serial/pl2303.c

+13 −0
Original line number Diff line number Diff line
@@ -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);