diff options
Diffstat (limited to 'drivers/staging/comedi/range.c')
| -rw-r--r-- | drivers/staging/comedi/range.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/staging/comedi/range.c b/drivers/staging/comedi/range.c index 6a393b24bdd9..ce3a58a7a171 100644 --- a/drivers/staging/comedi/range.c +++ b/drivers/staging/comedi/range.c @@ -102,7 +102,18 @@ int do_rangeinfo_ioctl(struct comedi_device *dev, * @s: comedi_subdevice struct * @n: number of elements in the chanlist * @chanlist: the chanlist to validate -*/ + * + * Each element consists of a channel number, a range index, an analog + * reference type and some flags, all packed into an unsigned int. + * + * This checks that the channel number and range index are supported by + * the comedi subdevice. It does not check whether the analog reference + * type and the flags are supported. Drivers that care should check those + * themselves. + * + * Return: %0 if all @chanlist elements are valid (success), + * %-EINVAL if one or more elements are invalid. + */ int comedi_check_chanlist(struct comedi_subdevice *s, int n, unsigned int *chanlist) { |