From 869149961951afccb103d43217282756b17f2f96 Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Wed, 16 Apr 2014 14:19:16 -0700 Subject: [PATCH] staging: comedi: dmm32at: 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/dmm32at.c | 51 ++++++++++++++---------- 1 file changed, 30 insertions(+), 21 deletions(-) diff --git a/drivers/staging/comedi/drivers/dmm32at.c b/drivers/staging/comedi/drivers/dmm32at.c index c8a36eb5f015..68260e6658e4 100644 --- a/drivers/staging/comedi/drivers/dmm32at.c +++ b/drivers/staging/comedi/drivers/dmm32at.c @@ -243,13 +243,39 @@ static int dmm32at_ns_to_timer(unsigned int *ns, int round) return *ns; } +static int dmm32at_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, + "entries in chanlist must be consecutive channels, counting upwards\n"); + return -EINVAL; + } + if (range != range0) { + dev_dbg(dev->class_dev, + "entries in chanlist must all have the same gain\n"); + return -EINVAL; + } + } + + return 0; +} + static int dmm32at_ai_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_cmd *cmd) { int err = 0; int tmp; - int start_chan, gain, i; /* Step 1 : check if triggers are trivially valid */ @@ -349,26 +375,9 @@ static int dmm32at_ai_cmdtest(struct comedi_device *dev, if (err) return 4; - /* step 5 check the channel list, the channel list for this - board must be consecutive and gains must be the same */ - - if (cmd->chanlist) { - gain = CR_RANGE(cmd->chanlist[0]); - start_chan = CR_CHAN(cmd->chanlist[0]); - for (i = 1; i < cmd->chanlist_len; i++) { - if (CR_CHAN(cmd->chanlist[i]) != - (start_chan + i) % s->n_chan) { - comedi_error(dev, - "entries in chanlist must be consecutive channels, counting upwards\n"); - err++; - } - if (CR_RANGE(cmd->chanlist[i]) != gain) { - comedi_error(dev, - "entries in 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 |= dmm32at_ai_check_chanlist(dev, s, cmd); if (err) return 5;