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authorH Hartley Sweeten <hsweeten@visionengravers.com>2013-07-29 13:48:38 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-07-31 17:37:44 -0700
commitb0926a7afabe49021f4fbed9baac0419ad3aa56a (patch)
tree8736d070d531426ae000981cd1b21ec3b716182d /include/trace/events
parent5589c7cc9f37e929754e0a14b85db7c23a28129f (diff)
staging: comedi: das16: fix DMA init during board attach
DMA support is optional in this driver. To enable it, the user passes the desired DMA channel during the board attach. A timer is then used by the driver to periodically get the analog input data from the DMA. Since the DMA support is optional, modify the init code so that it only fails if the DMA channel is unavailable or the DMA buffers can not be allocated. Don't fail just because the user passed an invalid DMA channel (only DMA channels 1 and 3 are valid). Remove the printk() noise about the DMA. Change the printk() when the request_dma() fails into a dev_err(). Move the timer initialization so it's only setup if DMA is available. It's not needed otherwise. Also, only hook up the subdevice command support functions if DMA is available. This allows removing a couple sanity checks in the command support. 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 'include/trace/events')
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