From 8c3ca59af3ec7326a1d6b07ed56edc5e729a36ab Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Wed, 16 Apr 2014 14:19:14 -0700 Subject: [PATCH] staging: comedi: das1800: factor out chanlist checking from (*do_cmdtest) Step 5 of the (*do_cmdtest) validates that the cmd->chanlist is compatible with the hardware. For aesthetics, factor out the step 5 code for the analog input async command support. Tidy up the factored out code. To minimize the noise, change the comedi_error(), which is a wrapper around dev_err(), to dev_dbg(). Signed-off-by: H Hartley Sweeten Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/das1800.c | 37 ++++++++++++++++++++------------ 1 file changed, 23 insertions(+), 14 deletions(-) diff --git a/drivers/staging/comedi/drivers/das1800.c b/drivers/staging/comedi/drivers/das1800.c index 8e975d6..d581029 100644 --- a/drivers/staging/comedi/drivers/das1800.c +++ b/drivers/staging/comedi/drivers/das1800.c @@ -757,6 +757,26 @@ static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode) return micro_sec * 1000; } +static int das1800_ai_check_chanlist(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_cmd *cmd) +{ + unsigned int unipolar0 = CR_RANGE(cmd->chanlist[0]) & UNIPOLAR; + int i; + + for (i = 1; i < cmd->chanlist_len; i++) { + unsigned int unipolar = CR_RANGE(cmd->chanlist[i]) & UNIPOLAR; + + if (unipolar != unipolar0) { + dev_dbg(dev->class_dev, + "unipolar and bipolar ranges cannot be mixed in the chanlist\n"); + return -EINVAL; + } + } + + return 0; +} + /* test analog input cmd */ static int das1800_ai_do_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s, @@ -766,8 +786,6 @@ static int das1800_ai_do_cmdtest(struct comedi_device *dev, struct das1800_private *devpriv = dev->private; int err = 0; unsigned int tmp_arg; - int i; - int unipolar; /* Step 1 : check if triggers are trivially valid */ @@ -873,18 +891,9 @@ static int das1800_ai_do_cmdtest(struct comedi_device *dev, if (err) return 4; - /* make sure user is not trying to mix unipolar and bipolar ranges */ - if (cmd->chanlist) { - unipolar = CR_RANGE(cmd->chanlist[0]) & UNIPOLAR; - for (i = 1; i < cmd->chanlist_len; i++) { - if (unipolar != (CR_RANGE(cmd->chanlist[i]) & UNIPOLAR)) { - comedi_error(dev, - "unipolar and bipolar ranges cannot be mixed in the chanlist"); - err++; - break; - } - } - } + /* Step 5: check channel list if it exists */ + if (cmd->chanlist && cmd->chanlist_len > 0) + err |= das1800_ai_check_chanlist(dev, s, cmd); if (err) return 5; -- 2.7.4