diff options
Diffstat (limited to 'drivers/staging/comedi/drivers/comedi_fc.h')
| -rw-r--r-- | drivers/staging/comedi/drivers/comedi_fc.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/staging/comedi/drivers/comedi_fc.h b/drivers/staging/comedi/drivers/comedi_fc.h index 4b2cfd327995..94481c637a0a 100644 --- a/drivers/staging/comedi/drivers/comedi_fc.h +++ b/drivers/staging/comedi/drivers/comedi_fc.h @@ -73,4 +73,36 @@ static inline unsigned int cfc_bytes_per_scan(struct comedi_subdevice *subd) return num_samples * bytes_per_sample(subd); } +/** + * cfc_check_trigger_src() - trivially validate a comedi_cmd trigger source + * @src: pointer to the trigger source to validate + * @flags: bitmask of valid TRIG_* for the trigger + * + * This is used in "step 1" of the do_cmdtest functions of comedi drivers + * to vaildate the comedi_cmd triggers. The mask of the @src against the + * @flags allows the userspace comedilib to pass all the comedi_cmd + * triggers as TRIG_ANY and get back a bitmask of the valid trigger sources. + */ +static inline int cfc_check_trigger_src(unsigned int *src, unsigned int flags) +{ + unsigned int orig_src = *src; + + *src = orig_src & flags; + if (*src == TRIG_INVALID || *src != orig_src) + return -EINVAL; + return 0; +} + +/** + * cfc_check_trigger_is_unique() - make sure a trigger source is unique + * @src: the trigger source to check + */ +static inline int cfc_check_trigger_is_unique(unsigned int src) +{ + /* this test is true if more than one _src bit is set */ + if ((src & (src - 1)) != 0) + return -EINVAL; + return 0; +} + #endif /* _COMEDI_FC_H */ |