diff options
| author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2014-04-16 14:19:14 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-04-22 10:18:49 -0700 |
| commit | 8c3ca59af3ec7326a1d6b07ed56edc5e729a36ab (patch) | |
| tree | 83ce2e2238340c524266744e8c8c87722f10e959 /drivers/staging/comedi/drivers/das1800.c | |
| parent | f71a28320d7bc7d8b712a10bc1553b06ec4c0487 (diff) | |
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 <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/comedi/drivers/das1800.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/das1800.c | 37 |
1 files changed, 23 insertions, 14 deletions
diff --git a/drivers/staging/comedi/drivers/das1800.c b/drivers/staging/comedi/drivers/das1800.c index 8e975d6b06db..d581029146cb 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; |