staging: comedi: quatech_daqp_cs: use comedi_timeout() in ao (*insn_write)

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The data link between the D/A data port and the D/A converter is a serial
link. The serial link requires about 8ms to complete a transfer. Use the
comedi_timeout() helper to ensure that there is not a previous transfer
still happening before trying to write new data to the channel.

For aesthetics, save the readback value after updating the hardware.

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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H Hartley Sweeten 2015-10-05 14:22:52 -07:00 • committed by Greg Kroah-Hartman

parent 1271dd24c6

commit e031642ecc

1 changed files with 20 additions and 1 deletions

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drivers/staging/comedi/drivers/quatech_daqp_cs.c

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