drivers/staging/comedi/drivers/ni_labpc_isadma.h

   1 /*
   2  * ni_labpc ISA DMA support.
   3 */
   4
   5 #ifndef _NI_LABPC_ISADMA_H
   6 #define _NI_LABPC_ISADMA_H
   7
   8 #define NI_LABPC_HAVE_ISA_DMA   IS_ENABLED(CONFIG_COMEDI_NI_LABPC_ISADMA)
   9
  10 #if NI_LABPC_HAVE_ISA_DMA
  11
  12 static inline bool labpc_have_dma_chan(struct comedi_device *dev)
  13 {
  14         struct labpc_private *devpriv = dev->private;
  15
  16         return (bool)devpriv->dma_chan;
  17 }
  18
  19 int labpc_init_dma_chan(struct comedi_device *dev, unsigned int dma_chan);
  20 void labpc_free_dma_chan(struct comedi_device *dev);
  21
  22 #else
  23
  24 static inline bool labpc_have_dma_chan(struct comedi_device *dev)
  25 {
  26         return false;
  27 }
  28
  29 static inline int labpc_init_dma_chan(struct comedi_device *dev,
  30                                       unsigned int dma_chan)
  31 {
  32         return -ENOTSUPP;
  33 }
  34
  35 static inline void labpc_free_dma_chan(struct comedi_device *dev)
  36 {
  37 }
  38
  39 #endif
  40
  41 #endif /* _NI_LABPC_ISADMA_H */