I am trying to write a device driver to stream data via a McBSP module. Most of it is a pretty thin layer, thanks to all the framework in plat-omap/mcbsp.c and .../mcbsp.h. However, I am getting stuck on the read() and write() implementation -- in particular, retrieving the device pointer for the DMA mapping functions.
To pick dma_map_single(dev, ptr, size, dir) as an example, the ARM implementation of dma_map_single() looks like it requires dev != NULL. struct omap_mcbsp's "dev" field would be the natural thing to pass, but the mcbsp_ptr array is not an exported symbol, and there is no function declared in mcbsp.h that will expose either the omap_mcbsp struct or the device struct inside it. Is there a good way to get the right struct device* for the McBSP module that this device driver is using? Would a patch be accepted to add a function that would return the struct device * given the McBSP id (and if so, should it use EXPORT_SYMBOL() or EXPORT_SYMBOL_GPL())? Michael Poole -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
