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staging: comedi: ni_labpc: cleanup local var declarations in labpc_ai_cmd() 

Determine the scan_mode early and get the proper chanspec so that
the chan, range, and aref can be determined when the variables are
declared.

labpc_ai_chanlist_invalid() checks that all the range and aref values
in the chanlist are the same so, for consistency, use the same chanspec
used to get the chan.

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>
This commit is contained in:
H Hartley Sweeten 2013-03-22 09:47:51 -07:00 committed by Greg Kroah-Hartman
parent 9718e5dfd7
commit 8a67a67f45
1 changed files with 10 additions and 13 deletions
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23
drivers/staging/comedi/drivers/ni_labpc.c
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@ -850,16 +850,18 @@ static int labpc_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
{
const struct labpc_boardinfo *board = comedi_board(dev);
struct labpc_private *devpriv = dev->private;
int channel, range, aref;
int ret;
struct comedi_async *async = s->async;
struct comedi_cmd *cmd = &async->cmd;
enum scan_mode mode = labpc_ai_scan_mode(cmd);
unsigned int chanspec = (mode == MODE_MULT_CHAN_UP)
? cmd->chanlist[cmd->chanlist_len - 1]
: cmd->chanlist[0];
unsigned int chan = CR_CHAN(chanspec);
unsigned int range = CR_RANGE(chanspec);
unsigned int aref = CR_AREF(chanspec);
enum transfer_type xfer;
enum scan_mode mode;
unsigned long flags;
range = CR_RANGE(cmd->chanlist[0]);
aref = CR_AREF(cmd->chanlist[0]);
int ret;
/* make sure board is disabled before setting up acquisition */
spin_lock_irqsave(&dev->spinlock, flags);
@ -916,7 +918,6 @@ static int labpc_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
} else
xfer = fifo_not_empty_transfer;
devpriv->current_transfer = xfer;
mode = labpc_ai_scan_mode(cmd);
/* setup cmd6 register for 1200 boards */
if (board->register_layout == labpc_1200_layout) {
@ -951,15 +952,11 @@ static int labpc_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
/* setup channel list, etc (cmd1 register) */
devpriv->cmd1 = 0;
if (mode == MODE_MULT_CHAN_UP)
channel = CR_CHAN(cmd->chanlist[cmd->chanlist_len - 1]);
else
channel = CR_CHAN(cmd->chanlist[0]);
/* munge channel bits for differential / scan disabled mode */
if ((mode == MODE_SINGLE_CHAN || mode == MODE_SINGLE_CHAN_INTERVAL) &&
aref == AREF_DIFF)
channel *= 2;
devpriv->cmd1 |= ADC_CHAN_BITS(channel);
chan *= 2;
devpriv->cmd1 |= ADC_CHAN_BITS(chan);
devpriv->cmd1 |= board->ai_range_code[range];
devpriv->write_byte(devpriv->cmd1, dev->iobase + COMMAND1_REG);
/* manual says to set scan enable bit on second pass */