staging: comedi: comedi_test: handle partial scans in timer routine

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For asynchronous command handling on the analog input subdevice, a
kernel timer routine is used to generate the fake waveform data.  A
"scan" consists of a number of conversions separated in time by a
conversion period.  Successive scans are separated in time by a scan
period, which is at least the conversion period multiplied by the number
of conversions per scan.  Currently, the timer routine does not generate
any data until the end of a scan period, generating whole scans of data
at a time.  Change it to generate data at the end of each conversion
period, with an extra delay after the final conversion in each scan if
necessary.  Use new member `ai_convert_time` in the private data
structure `struct waveform_private` to keep track of when the next
conversion is due.  This replaces the old member `ai_last_scan_time`
which kept track of the time of the previous scan.

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>

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Ian Abbott 2015-10-27 16:59:23 +00:00 • committed by Greg Kroah-Hartman

parent e0c6fe1294

commit 1eb85ae857

1 changed files with 54 additions and 31 deletions

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drivers/staging/comedi/drivers/comedi_test.c

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