From 58cd9b91f809196adb39b52d1c18069ca73c8103 Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Fri, 22 Mar 2013 09:56:48 -0700 Subject: [PATCH] staging: comedi: ni_labpc: cleanup trigger setting in labpc_ai_cmd() The (*do_cmdtest) already validated the cmd sources so the default cases in the switch() statements can never happen. Preclear to trigger bits and change the switch() statements to simple if() tests to set the bits. Signed-off-by: H Hartley Sweeten Cc: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/ni_labpc.c | 35 ++++++++----------------------- 1 file changed, 9 insertions(+), 26 deletions(-) diff --git a/drivers/staging/comedi/drivers/ni_labpc.c b/drivers/staging/comedi/drivers/ni_labpc.c index 244b3e5..f612875 100644 --- a/drivers/staging/comedi/drivers/ni_labpc.c +++ b/drivers/staging/comedi/drivers/ni_labpc.c @@ -1054,38 +1054,21 @@ static int labpc_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s) /* startup acquisition */ - /* cmd2 reg */ - /* use 2 cascaded counters for pacing */ spin_lock_irqsave(&dev->spinlock, flags); + + /* use 2 cascaded counters for pacing */ devpriv->cmd2 |= CMD2_TBSEL; - switch (cmd->start_src) { - case TRIG_EXT: + + devpriv->cmd2 &= ~(CMD2_SWTRIG | CMD2_HWTRIG | CMD2_PRETRIG); + if (cmd->start_src == TRIG_EXT) devpriv->cmd2 |= CMD2_HWTRIG; - devpriv->cmd2 &= ~(CMD2_PRETRIG | CMD2_SWTRIG); - break; - case TRIG_NOW: + else devpriv->cmd2 |= CMD2_SWTRIG; - devpriv->cmd2 &= ~(CMD2_PRETRIG | CMD2_HWTRIG); - break; - default: - comedi_error(dev, "bug with start_src"); - spin_unlock_irqrestore(&dev->spinlock, flags); - return -1; - break; - } - switch (cmd->stop_src) { - case TRIG_EXT: + if (cmd->stop_src == TRIG_EXT) devpriv->cmd2 |= (CMD2_HWTRIG | CMD2_PRETRIG); - break; - case TRIG_COUNT: - case TRIG_NONE: - break; - default: - comedi_error(dev, "bug with stop_src"); - spin_unlock_irqrestore(&dev->spinlock, flags); - return -1; - } + devpriv->write_byte(devpriv->cmd2, dev->iobase + CMD2_REG); + spin_unlock_irqrestore(&dev->spinlock, flags); return 0; -- 2.7.4