diff options
author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2014-04-16 14:19:15 -0700 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-04-22 10:18:49 -0700 |
commit | 1626657f35f5b2973fa50f16fb49e20a626cb636 (patch) | |
tree | 342120f3ed8e9170a8c230d51e6f0b28198a0267 /drivers/staging/comedi/drivers/das800.c | |
parent | 8c3ca59af3ec7326a1d6b07ed56edc5e729a36ab (diff) |
staging: comedi: das800: 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 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/das800.c')
-rw-r--r-- | drivers/staging/comedi/drivers/das800.c | 52 |
1 files changed, 31 insertions, 21 deletions
diff --git a/drivers/staging/comedi/drivers/das800.c b/drivers/staging/comedi/drivers/das800.c index 3e408370dcf3..b23a12ce7651 100644 --- a/drivers/staging/comedi/drivers/das800.c +++ b/drivers/staging/comedi/drivers/das800.c @@ -300,6 +300,34 @@ static int das800_cancel(struct comedi_device *dev, struct comedi_subdevice *s) return 0; } +static int das800_ai_check_chanlist(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_cmd *cmd) +{ + unsigned int chan0 = CR_CHAN(cmd->chanlist[0]); + unsigned int range0 = CR_RANGE(cmd->chanlist[0]); + int i; + + for (i = 1; i < cmd->chanlist_len; i++) { + unsigned int chan = CR_CHAN(cmd->chanlist[i]); + unsigned int range = CR_RANGE(cmd->chanlist[i]); + + if (chan != (chan0 + i) % s->n_chan) { + dev_dbg(dev->class_dev, + "chanlist must be consecutive, counting upwards\n"); + return -EINVAL; + } + + if (range != range0) { + dev_dbg(dev->class_dev, + "chanlist must all have the same gain\n"); + return -EINVAL; + } + } + + return 0; +} + static int das800_ai_do_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_cmd *cmd) @@ -366,27 +394,9 @@ static int das800_ai_do_cmdtest(struct comedi_device *dev, if (err) return 4; - /* check channel/gain list against card's limitations */ - if (cmd->chanlist) { - unsigned int chan = CR_CHAN(cmd->chanlist[0]); - unsigned int range = CR_RANGE(cmd->chanlist[0]); - unsigned int next; - int i; - - for (i = 1; i < cmd->chanlist_len; i++) { - next = cmd->chanlist[i]; - if (CR_CHAN(next) != (chan + i) % N_CHAN_AI) { - dev_err(dev->class_dev, - "chanlist must be consecutive, counting upwards\n"); - err++; - } - if (CR_RANGE(next) != range) { - dev_err(dev->class_dev, - "chanlist must all have the same gain\n"); - err++; - } - } - } + /* Step 5: check channel list if it exists */ + if (cmd->chanlist && cmd->chanlist_len > 0) + err |= das800_ai_check_chanlist(dev, s, cmd); if (err) return 5; |