staging: comedi: pcl816: introduce pcl816_alloc_dma()

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The IRA and DMA are optional with this driver but both are required to
support async commands. Introduce a helper function to request the IRQ
and DMA channel and allocate the buffers. Don't fail the driver attach
if the user passed an invalid IRQ or DMA channel or they cannot be
requested.

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 2015-01-12 10:56:00 -07:00 • committed by Greg Kroah-Hartman

parent 1c53093a1d

commit 1fa51639e5

1 changed files with 56 additions and 35 deletions

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drivers/staging/comedi/drivers/pcl816.c

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