USB: ftdi_sio.c: Basic icount infrastructure for ftdi_sio
Uwe Bonnes [Mon, 10 Oct 2011 15:24:08 +0000 (17:24 +0200)]
Signed-off-by: Uwe Bonnes <bon@elektron.ikp.physik.tu-darmstadt.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/serial/ftdi_sio.c

index effc436..4cfc4cd 100644 (file)
@@ -73,6 +73,7 @@ struct ftdi_private {
                                 */
        int flags;              /* some ASYNC_xxxx flags are supported */
        unsigned long last_dtr_rts;     /* saved modem control outputs */
+       struct async_icount     icount;
        wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
        char prev_status, diff_status;        /* Used for TIOCMIWAIT */
        char transmit_empty;    /* If transmitter is empty or not */
@@ -889,6 +890,8 @@ static void ftdi_set_termios(struct tty_struct *tty,
 static int  ftdi_tiocmget(struct tty_struct *tty);
 static int  ftdi_tiocmset(struct tty_struct *tty,
                        unsigned int set, unsigned int clear);
+static int ftdi_get_icount(struct tty_struct *tty,
+                          struct serial_icounter_struct *icount);
 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);
@@ -923,6 +926,7 @@ static struct usb_serial_driver ftdi_sio_device = {
        .prepare_write_buffer = ftdi_prepare_write_buffer,
        .tiocmget =             ftdi_tiocmget,
        .tiocmset =             ftdi_tiocmset,
+       .get_icount =           ftdi_get_icount,
        .ioctl =                ftdi_ioctl,
        .set_termios =          ftdi_set_termios,
        .break_ctl =            ftdi_break_ctl,
@@ -1650,6 +1654,7 @@ static int ftdi_sio_port_probe(struct usb_serial_port *port)
 
        kref_init(&priv->kref);
        mutex_init(&priv->cfg_lock);
+       memset(&priv->icount, 0x00, sizeof(priv->icount));
        init_waitqueue_head(&priv->delta_msr_wait);
 
        priv->flags = ASYNC_LOW_LATENCY;
@@ -2281,6 +2286,27 @@ static int ftdi_tiocmset(struct tty_struct *tty,
        return update_mctrl(port, set, clear);
 }
 
+static int ftdi_get_icount(struct tty_struct *tty,
+                               struct serial_icounter_struct *icount)
+{
+       struct usb_serial_port *port = tty->driver_data;
+       struct ftdi_private *priv = usb_get_serial_port_data(port);
+       struct async_icount *ic = &priv->icount;
+
+       icount->cts = ic->cts;
+       icount->dsr = ic->dsr;
+       icount->rng = ic->rng;
+       icount->dcd = ic->dcd;
+       icount->tx = ic->tx;
+       icount->rx = ic->rx;
+       icount->frame = ic->frame;
+       icount->parity = ic->parity;
+       icount->overrun = ic->overrun;
+       icount->brk = ic->brk;
+       icount->buf_overrun = ic->buf_overrun;
+       return 0;
+}
+
 static int ftdi_ioctl(struct tty_struct *tty,
                                        unsigned int cmd, unsigned long arg)
 {