V4L/DVB (3516): Make video_buf more generic

Video_buf were concerned to allow PCI devices to be used as
video capture devices. This patch extends video_buf features
by virtualizing pci-dependent functions and allowing other
type of devices to use it.
It is still DMA centric, although it may be used also by
devices that emulates scatter/gather behavior or a DMA device

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/video/cx88/cx88-core.c b/drivers/media/video/cx88/cx88-core.c
index c2cdbaf..2c3d9f1 100644
--- a/drivers/media/video/cx88/cx88-core.c
+++ b/drivers/media/video/cx88/cx88-core.c
@@ -213,13 +213,13 @@
 }
 
 void
-cx88_free_buffer(struct pci_dev *pci, struct cx88_buffer *buf)
+cx88_free_buffer(struct videobuf_queue *q, struct cx88_buffer *buf)
 {
 	BUG_ON(in_interrupt());
 	videobuf_waiton(&buf->vb,0,0);
-	videobuf_dma_pci_unmap(pci, &buf->vb.dma);
+	videobuf_dma_unmap(q, &buf->vb.dma);
 	videobuf_dma_free(&buf->vb.dma);
-	btcx_riscmem_free(pci, &buf->risc);
+	btcx_riscmem_free((struct pci_dev *)q->dev, &buf->risc);
 	buf->vb.state = STATE_NEEDS_INIT;
 }