diff options
author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2014-04-16 14:19:13 -0700 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-04-22 10:18:48 -0700 |
commit | f71a28320d7bc7d8b712a10bc1553b06ec4c0487 (patch) | |
tree | e405da303fd87f053ad1d6431fece9638529b723 | |
parent | f207eda15f49fd84aaf18db8927fd51a93970fbf (diff) | |
download | linux-f71a28320d7bc7d8b712a10bc1553b06ec4c0487.tar.bz2 |
staging: comedi: das16m1: 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>
-rw-r--r-- | drivers/staging/comedi/drivers/das16m1.c | 49 |
1 files changed, 32 insertions, 17 deletions
diff --git a/drivers/staging/comedi/drivers/das16m1.c b/drivers/staging/comedi/drivers/das16m1.c index 779225831dc0..a9cd21068ea8 100644 --- a/drivers/staging/comedi/drivers/das16m1.c +++ b/drivers/staging/comedi/drivers/das16m1.c @@ -150,11 +150,39 @@ static void munge_sample_array(unsigned short *array, unsigned int num_elements) array[i] = munge_sample(array[i]); } +static int das16m1_ai_check_chanlist(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_cmd *cmd) +{ + int i; + + if (cmd->chanlist_len == 1) + return 0; + + if ((cmd->chanlist_len % 2) != 0) { + dev_dbg(dev->class_dev, + "chanlist must be of even length or length 1\n"); + return -EINVAL; + } + + for (i = 0; i < cmd->chanlist_len; i++) { + unsigned int chan = CR_CHAN(cmd->chanlist[i]); + + if ((i % 2) != (chan % 2)) { + dev_dbg(dev->class_dev, + "even/odd channels must go have even/odd chanlist indices\n"); + return -EINVAL; + } + } + + return 0; +} + static int das16m1_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_cmd *cmd) { struct das16m1_private_struct *devpriv = dev->private; - unsigned int err = 0, tmp, i; + unsigned int err = 0, tmp; /* Step 1 : check if triggers are trivially valid */ @@ -216,22 +244,9 @@ static int das16m1_cmd_test(struct comedi_device *dev, if (err) return 4; - /* check chanlist against board's peculiarities */ - if (cmd->chanlist && cmd->chanlist_len > 1) { - for (i = 0; i < cmd->chanlist_len; i++) { - /* even/odd channels must go into even/odd queue addresses */ - if ((i % 2) != (CR_CHAN(cmd->chanlist[i]) % 2)) { - comedi_error(dev, "bad chanlist:\n" - " even/odd channels must go have even/odd chanlist indices"); - err++; - } - } - if ((cmd->chanlist_len % 2) != 0) { - comedi_error(dev, - "chanlist must be of even length or length 1"); - err++; - } - } + /* Step 5: check channel list if it exists */ + if (cmd->chanlist && cmd->chanlist_len > 0) + err |= das16m1_ai_check_chanlist(dev, s, cmd); if (err) return 5; |