diff options
Diffstat (limited to 'drivers/staging/comedi/drivers/ni_stc.h')
| -rw-r--r-- | drivers/staging/comedi/drivers/ni_stc.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/staging/comedi/drivers/ni_stc.h b/drivers/staging/comedi/drivers/ni_stc.h index 1966519cb6e5..f27b545f83eb 100644 --- a/drivers/staging/comedi/drivers/ni_stc.h +++ b/drivers/staging/comedi/drivers/ni_stc.h @@ -1053,6 +1053,20 @@ struct ni_private { unsigned int is_67xx:1; unsigned int is_6711:1; unsigned int is_6713:1; + + /* + * Boolean value of whether device needs to be armed. + * + * Currently, only NI AO devices are known to be needing arming, since + * the DAC registers must be preloaded before triggering. + * This variable should only be set true during a command operation + * (e.g ni_ao_cmd) and should then be set false by the arming + * function (e.g. ni_ao_arm). + * + * This variable helps to ensure that multiple DMA allocations are not + * possible. + */ + unsigned int ao_needs_arming:1; }; static const struct comedi_lrange range_ni_E_ao_ext; |