staging: comedi: das16m1: introduce das16m1_ai_set_queue()

Introduce a helper function to handle writing the channel/gain data to
the queue for single channel reads, (*insn_read), and multi-channel
scans, (*do_cmd).

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

diff --git a/drivers/staging/comedi/drivers/das16m1.c b/drivers/staging/comedi/drivers/das16m1.c
index 1a8cf92..b941dcf 100644 (file)
--- a/drivers/staging/comedi/drivers/das16m1.c
+++ b/drivers/staging/comedi/drivers/das16m1.c
@@ -112,6 +112,21 @@ struct das16m1_private_struct {
        unsigned long extra_iobase;
 };
 
+static void das16m1_ai_set_queue(struct comedi_device *dev,
+                                unsigned int *chanspec, unsigned int len)
+{
+       unsigned int i;
+
+       for (i = 0; i < len; i++) {
+               unsigned int chan = CR_CHAN(chanspec[i]);
+               unsigned int range = CR_RANGE(chanspec[i]);
+
+               outb(i, dev->iobase + DAS16M1_Q_ADDR_REG);
+               outb(DAS16M1_Q_CHAN(chan) | DAS16M1_Q_RANGE(range),
+                    dev->iobase + DAS16M1_Q_REG);
+       }
+}
+
 static void munge_sample_array(unsigned short *array, unsigned int num_elements)
 {
        unsigned int i;
@@ -225,7 +240,7 @@ static int das16m1_cmd_exec(struct comedi_device *dev,
        struct das16m1_private_struct *devpriv = dev->private;
        struct comedi_async *async = s->async;
        struct comedi_cmd *cmd = &async->cmd;
-       unsigned int byte, i;
+       unsigned int byte;
 
        /*  set software count */
        devpriv->adc_count = 0;
@@ -244,14 +259,7 @@ static int das16m1_cmd_exec(struct comedi_device *dev,
         */
        devpriv->initial_hw_count = comedi_8254_read(devpriv->counter, 1);
 
-       /* setup channel/gain queue */
-       for (i = 0; i < cmd->chanlist_len; i++) {
-               outb(i, dev->iobase + DAS16M1_Q_ADDR_REG);
-               byte =
-                   DAS16M1_Q_CHAN(CR_CHAN(cmd->chanlist[i])) |
-                   DAS16M1_Q_RANGE(CR_RANGE(cmd->chanlist[i]));
-               outb(byte, dev->iobase + DAS16M1_Q_REG);
-       }
+       das16m1_ai_set_queue(dev, cmd->chanlist, cmd->chanlist_len);
 
        /* enable interrupts and set internal pacer counter mode and counts */
        devpriv->intr_ctrl &= ~DAS16M1_INTR_CTRL_PACER_MASK;
@@ -314,13 +322,8 @@ static int das16m1_ai_rinsn(struct comedi_device *dev,
 {
        int ret;
        int n;
-       int byte;
 
-       /* setup channel/gain queue */
-       outb(0, dev->iobase + DAS16M1_Q_ADDR_REG);
-       byte = DAS16M1_Q_CHAN(CR_CHAN(insn->chanspec)) |
-              DAS16M1_Q_RANGE(CR_RANGE(insn->chanspec));
-       outb(byte, dev->iobase + DAS16M1_Q_REG);
+       das16m1_ai_set_queue(dev, &insn->chanspec, 1);
 
        for (n = 0; n < insn->n; n++) {
                unsigned short val;