From f207eda15f49fd84aaf18db8927fd51a93970fbf Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Wed, 16 Apr 2014 14:19:12 -0700 Subject: [PATCH] staging: comedi: das16: 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 Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/das16.c | 51 +++++++++++++++++++++------------- 1 file changed, 32 insertions(+), 19 deletions(-) diff --git a/drivers/staging/comedi/drivers/das16.c b/drivers/staging/comedi/drivers/das16.c index 6a7d652..eb774c3 100644 --- a/drivers/staging/comedi/drivers/das16.c +++ b/drivers/staging/comedi/drivers/das16.c @@ -600,13 +600,40 @@ static void das16_timer_interrupt(unsigned long arg) mod_timer(&devpriv->timer, jiffies + timer_period()); } +static int das16_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 das16_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_cmd *cmd) { const struct das16_board *board = comedi_board(dev); struct das16_private_struct *devpriv = dev->private; int err = 0, tmp; - int gain, start_chan, i; int mask; /* Step 1 : check if triggers are trivially valid */ @@ -693,24 +720,10 @@ static int das16_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s, if (err) return 4; - /* check channel/gain list against card's limitations */ - 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) { - dev_err(dev->class_dev, - "entries in chanlist must be consecutive channels, counting upwards\n"); - err++; - } - if (CR_RANGE(cmd->chanlist[i]) != gain) { - dev_err(dev->class_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 |= das16_ai_check_chanlist(dev, s, cmd); + if (err) return 5; -- 2.7.4