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author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2014-10-31 16:49:31 (GMT) |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-11-04 00:31:24 (GMT) |
commit | f8736ca466e2014d6e8bad478fcc5e5cb0105af0 (patch) | |
tree | efb86b1332d953979f285fddf283be17cf64a3e5 /drivers/staging/comedi/drivers.c | |
parent | c1b617e017f858505ce639a8dee4d096fbcb7b6b (diff) | |
download | linux-f8736ca466e2014d6e8bad478fcc5e5cb0105af0.tar.xz |
staging: comedi: drivers: move comedi_async 'cur_chan' tracking into the core
The commedi_async 'cur_chan' member is used to track the current position
in the chanlist for a scan. Currently only a couple comedi drivers use
this member.
For aeshtetics, move the 'cur_chan' tracking into the core for non-SDF_PACKED
subdevices. The 'cur_chan' will be updated after reading or writing samples
to the async buffer by comedi_inc_scan_progress(). All non-SDF_PACKED subdevices
will then automatiaclly track the 'cur_chan'.
Some of the drivers use the 'cur_chan' to detect the end of scan event when
counting scans. The COMEDI_CB_EOS event is automatically added by the core
when the end of scan is detected. The drivers just need to check if the
'cur_chan' is 0 to count the number of scans completed.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
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 | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/staging/comedi/drivers.c b/drivers/staging/comedi/drivers.c index ff2df85..9c55dc7 100644 --- a/drivers/staging/comedi/drivers.c +++ b/drivers/staging/comedi/drivers.c @@ -341,8 +341,15 @@ void comedi_inc_scan_progress(struct comedi_subdevice *s, unsigned int num_bytes) { struct comedi_async *async = s->async; + struct comedi_cmd *cmd = &async->cmd; unsigned int scan_length = comedi_bytes_per_scan(s); + /* track the 'cur_chan' for non-SDF_PACKED subdevices */ + if (!(s->subdev_flags & SDF_PACKED)) { + async->cur_chan += comedi_bytes_to_samples(s, num_bytes); + async->cur_chan %= cmd->chanlist_len; + } + async->scan_progress += num_bytes; if (async->scan_progress >= scan_length) { async->scan_progress %= scan_length; |