staging: comedi: comedidev.h: add 'scans_done' member to comedi_async
Introduce a new member to comedi_async to count the number of scans completed. This member is cleared by comedi_buf_reset() along with the other comedi_async members. It is incremented in comedi_inc_scan_progress() when the end of scan is detected. This member will be used to clean up the scan counting in the comedi drivers. 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>
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@ -236,6 +236,7 @@ void comedi_buf_reset(struct comedi_subdevice *s)
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async->buf_read_ptr = 0;
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async->cur_chan = 0;
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async->scans_done = 0;
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async->scan_progress = 0;
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async->munge_chan = 0;
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async->munge_count = 0;
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@ -121,6 +121,7 @@ struct comedi_buf_map {
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* @buf_read_ptr: buffer position for reader
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* @cur_chan: current position in chanlist for scan (for those
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* drivers that use it)
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* @scans_done: the number of scans completed (COMEDI_CB_EOS)
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* @scan_progress: amount received or sent for current scan (in bytes)
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* @munge_chan: current position in chanlist for "munging"
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* @munge_count: "munge" count (in bytes, modulo 2**32)
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@ -201,6 +202,7 @@ struct comedi_async {
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unsigned int buf_write_ptr;
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unsigned int buf_read_ptr;
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unsigned int cur_chan;
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unsigned int scans_done;
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unsigned int scan_progress;
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unsigned int munge_chan;
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unsigned int munge_count;
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@ -352,6 +352,13 @@ void comedi_inc_scan_progress(struct comedi_subdevice *s,
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async->scan_progress += num_bytes;
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if (async->scan_progress >= scan_length) {
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unsigned int nscans = async->scan_progress / scan_length;
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if (async->scans_done < (UINT_MAX - nscans))
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async->scans_done += nscans;
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else
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async->scans_done = UINT_MAX;
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async->scan_progress %= scan_length;
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async->events |= COMEDI_CB_EOS;
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}
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