diff options
| author | Ian Abbott <abbotti@mev.co.uk> | 2014-09-15 13:45:59 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-09-19 15:55:31 -0700 |
| commit | 2b4e1f632478f43bda1b38e04e0d740980fff1f3 (patch) | |
| tree | e03f0642eab6f4bc49dfdcdd2cf44b5a6e249b99 /drivers/staging/comedi/drivers.c | |
| parent | 55deb39b1290df023b23273a4c541784c6570098 (diff) | |
staging: comedi: add comedi_inc_scan_progress()
The "comedi_fc" module contains a few functions useful to Comedi
drivers. Their functionality is being migrated to the core "comedi"
module and renamed to start with the prefix `comedi_`. As part of this
migration, move `cfc_inc_scan_progress()` into the core comedi module
and rename it to `comedi_inc_scan_progress()`. Change the external
declaration of `cfc_inc_scan_progress()` into an inline function that
calls `comedi_inc_scan_progress()`.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/comedi/drivers.c')
| -rw-r--r-- | drivers/staging/comedi/drivers.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/staging/comedi/drivers.c b/drivers/staging/comedi/drivers.c index 891c092697c5..691a2c40bb63 100644 --- a/drivers/staging/comedi/drivers.c +++ b/drivers/staging/comedi/drivers.c @@ -327,6 +327,30 @@ unsigned int comedi_bytes_per_scan(struct comedi_subdevice *s) } EXPORT_SYMBOL_GPL(comedi_bytes_per_scan); +/** + * comedi_inc_scan_progress - update scan progress in asynchronous command + * @s: comedi_subdevice struct + * @num_bytes: amount of data in bytes to increment scan progress + * + * Increments the scan progress by the number of bytes specified by num_bytes. + * If the scan progress reaches or exceeds the scan length in bytes, reduce + * it modulo the scan length in bytes and set the "end of scan" asynchronous + * event flag to be processed later. + */ +void comedi_inc_scan_progress(struct comedi_subdevice *s, + unsigned int num_bytes) +{ + struct comedi_async *async = s->async; + unsigned int scan_length = comedi_bytes_per_scan(s); + + async->scan_progress += num_bytes; + if (async->scan_progress >= scan_length) { + async->scan_progress %= scan_length; + async->events |= COMEDI_CB_EOS; + } +} +EXPORT_SYMBOL_GPL(comedi_inc_scan_progress); + static int insn_rw_emulate_bits(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_insn *insn, unsigned int *data) |