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dmaengine: split out pause/resume operations from device_control 

Split out the pause and resume operations to callbacks of their own. In order
to preserve some backwark compatibility, the dmaengine_pause/dmaengine_resume
are still falling back on dmaengine_device_control.

Eventually, that will allow to get the device capabilities in a generic way,
removing the need to implement device_slave_caps.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Maxime Ripard 2014-11-17 14:42:01 +01:00 committed by Vinod Koul
parent 94a73e30df
commit 23a3ea2f5b
1 changed files with 12 additions and 0 deletions
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12
include/linux/dmaengine.h
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@ -612,6 +612,10 @@ struct dma_tx_state {
* code
* @device_control: manipulate all pending operations on a channel, returns
* zero or error code
* @device_pause: Pauses any transfer happening on a channel. Returns
* 0 or an error code
* @device_resume: Resumes any transfer on a channel previously
* paused. Returns 0 or an error code
* @device_tx_status: poll for transaction completion, the optional
* txstate parameter can be supplied with a pointer to get a
* struct with auxiliary transfer status information, otherwise the call
@ -681,6 +685,8 @@ struct dma_device {
struct dma_slave_config *config);
int (*device_control)(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
unsigned long arg);
int (*device_pause)(struct dma_chan *chan);
int (*device_resume)(struct dma_chan *chan);
enum dma_status (*device_tx_status)(struct dma_chan *chan,
dma_cookie_t cookie,
@ -795,11 +801,17 @@ static inline int dmaengine_terminate_all(struct dma_chan *chan)
static inline int dmaengine_pause(struct dma_chan *chan)
{
if (chan->device->device_pause)
return chan->device->device_pause(chan);
return dmaengine_device_control(chan, DMA_PAUSE, 0);
}
static inline int dmaengine_resume(struct dma_chan *chan)
{
if (chan->device->device_resume)
return chan->device->device_resume(chan);
return dmaengine_device_control(chan, DMA_RESUME, 0);
}