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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: John Tsiombikas <nuclear@member.fsf.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
John Tsiombikas 2010-02-25 17:09:08 +02:00 committed by Greg Kroah-Hartman
parent ac7d4ca9e0
commit 67b9946dd0
1 changed files with 13 additions and 0 deletions
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13
drivers/usb/serial/pl2303.c
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@ -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);