diff options
author | Johan Hovold <jhovold@gmail.com> | 2012-10-29 10:56:28 +0100 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-10-30 21:19:32 +0100 |
commit | 5fb0432e64335bcf3f620e2d86a97fba0437c84b (patch) | |
tree | a5ad7d01729bf474289e273b603c983c0b07c247 /drivers/usb/serial/ftdi_sio.c | |
parent | USB: ftdi_sio: optimise chars_in_buffer (diff) | |
download | linux-5fb0432e64335bcf3f620e2d86a97fba0437c84b.tar.xz linux-5fb0432e64335bcf3f620e2d86a97fba0437c84b.zip |
USB: ftdi_sio: use ftdi_get_modem_status in chars_in_buffer
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>
Diffstat (limited to 'drivers/usb/serial/ftdi_sio.c')
-rw-r--r-- | drivers/usb/serial/ftdi_sio.c | 52 |
1 files changed, 11 insertions, 41 deletions
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c index b8bc9d0cb127..8c3379b52f24 100644 --- a/drivers/usb/serial/ftdi_sio.c +++ b/drivers/usb/serial/ftdi_sio.c @@ -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; - - /* 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; - } - - buf = kmalloc(2, GFP_KERNEL); - if (!buf) { - dev_err(&port->dev, "kmalloc failed"); - return chars; - } + goto out; - 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; + /* 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); - if (!(buf[1] & FTDI_RS_TEMT)) - chars++; - -chars_in_buffer_out: - kfree(buf); return chars; } |