staging: comedi: vmk80xx: remove digital output (*insn_read)

The comedi core can use the (*insn_bits) function to emulate the
(*insn_read) function.

The digital output (*insn_bits) function properly handles the
VMK8061_MODEL to read the digital output states before returning.

Remove the unnecessary (*insn_read) function. It's also not
necessary to set the SDF_READABLE flag so remove the entire
conditional in the attach.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/comedi/drivers/vmk80xx.c b/drivers/staging/comedi/drivers/vmk80xx.c
index 00f5784..4f32bad 100644 (file)
--- a/drivers/staging/comedi/drivers/vmk80xx.c
+++ b/drivers/staging/comedi/drivers/vmk80xx.c
@@ -799,39 +799,6 @@ static int vmk80xx_do_insn_write(struct comedi_device *dev,
        return n;
 }
 
-static int vmk80xx_do_insn_read(struct comedi_device *dev,
-                               struct comedi_subdevice *s,
-                               struct comedi_insn *insn,
-                               unsigned int *data)
-{
-       struct vmk80xx_private *devpriv = dev->private;
-       int chan;
-       int reg;
-       int n;
-
-       n = rudimentary_check(devpriv, DIR_IN);
-       if (n)
-               return n;
-
-       down(&devpriv->limit_sem);
-       chan = CR_CHAN(insn->chanspec);
-
-       reg = VMK8061_DO_REG;
-
-       devpriv->usb_tx_buf[0] = VMK8061_CMD_RD_DO;
-
-       for (n = 0; n < insn->n; n++) {
-               if (vmk80xx_read_packet(devpriv))
-                       break;
-
-               data[n] = (devpriv->usb_rx_buf[reg] >> chan) & 1;
-       }
-
-       up(&devpriv->limit_sem);
-
-       return n;
-}
-
 static int vmk80xx_do_insn_bits(struct comedi_device *dev,
                                struct comedi_subdevice *s,
                                struct comedi_insn *insn,
@@ -1244,10 +1211,6 @@ static int vmk80xx_attach_common(struct comedi_device *dev)
        s->range_table  = &range_digital;
        s->insn_write   = vmk80xx_do_insn_write;
        s->insn_bits    = vmk80xx_do_insn_bits;
-       if (devpriv->model == VMK8061_MODEL) {
-               s->subdev_flags |= SDF_READABLE;
-               s->insn_read    = vmk80xx_do_insn_read;
-       }
 
        /* Counter subdevice */
        s = &dev->subdevices[4];