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USB: ftdi_sio: use ftdi_get_modem_status in chars_in_buffer

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Use ftdi_get_modem_status to check hardware buffers in chars_in_buffer.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2012-10-29 10:56:28 +01:00 committed by Greg Kroah-Hartman
parent 8da636d9b5
commit 5fb0432e64
1 changed files with 11 additions and 41 deletions
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52
drivers/usb/serial/ftdi_sio.c
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@ -923,6 +923,8 @@ static int ftdi_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg);
static void ftdi_break_ctl(struct tty_struct *tty, int break_state);
static int ftdi_chars_in_buffer(struct tty_struct *tty);
static int ftdi_get_modem_status(struct tty_struct *tty,
unsigned char status[2]);
static unsigned short int ftdi_232am_baud_base_to_divisor(int baud, int base);
static unsigned short int ftdi_232am_baud_to_divisor(int baud);
@ -2092,55 +2094,23 @@ static void ftdi_break_ctl(struct tty_struct *tty, int break_state)
static int ftdi_chars_in_buffer(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct ftdi_private *priv = usb_get_serial_port_data(port);
int chars;
unsigned char *buf;
unsigned char buf[2];
int ret;
chars = usb_serial_generic_chars_in_buffer(tty);
if (chars)
return chars;
goto out;
/* Check hardware buffer */
switch (priv->chip_type) {
case FT8U232AM:
case FT232BM:
case FT2232C:
case FT232RL:
case FT2232H:
case FT4232H:
case FT232H:
case FTX:
break;
case SIO:
default:
return chars;
/* Check if hardware buffer is empty. */
ret = ftdi_get_modem_status(tty, buf);
if (ret == 2) {
if (!(buf[1] & FTDI_RS_TEMT))
chars = 1;
}
out:
dev_dbg(&port->dev, "%s - %d\n", __func__, chars);
buf = kmalloc(2, GFP_KERNEL);
if (!buf) {
dev_err(&port->dev, "kmalloc failed");
return chars;
}
ret = usb_control_msg(port->serial->dev,
usb_rcvctrlpipe(port->serial->dev, 0),
FTDI_SIO_GET_MODEM_STATUS_REQUEST,
FTDI_SIO_GET_MODEM_STATUS_REQUEST_TYPE,
0, priv->interface,
buf, 2, WDR_TIMEOUT);
if (ret < 2) {
dev_err(&port->dev, "Unable to read modem and line status: "
"%i\n", ret);
goto chars_in_buffer_out;
}
if (!(buf[1] & FTDI_RS_TEMT))
chars++;
chars_in_buffer_out:
kfree(buf);
return chars;
}