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>

drivers/media/common/saa7146_fops.c

@@ -50,14 +50,15 @@ void saa7146_res_free(struct saa7146_fh *fh, unsigned int bits)
 /********************************************************************************/
 /* common dma functions */
 
-void saa7146_dma_free(struct saa7146_dev *dev,struct saa7146_buf *buf)
+void saa7146_dma_free(struct saa7146_dev *dev,struct videobuf_queue *q,
+						struct saa7146_buf *buf)
 {
 	DEB_EE(("dev:%p, buf:%p\n",dev,buf));
 
 	BUG_ON(in_interrupt());
 
 	videobuf_waiton(&buf->vb,0,0);
-	videobuf_dma_pci_unmap(dev->pci, &buf->vb.dma);
+	videobuf_dma_unmap(q, &buf->vb.dma);
 	videobuf_dma_free(&buf->vb.dma);
 	buf->vb.state = STATE_NEEDS_INIT;
 }

drivers/media/common/saa7146_vbi.c

@@ -236,7 +236,7 @@ static int buffer_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,e
 	}
 
 	if (buf->vb.size != size)
-		saa7146_dma_free(dev,buf);
+		saa7146_dma_free(dev,q,buf);
 
 	if (STATE_NEEDS_INIT == buf->vb.state) {
 		buf->vb.width  = llength;
@@ -247,7 +247,7 @@ static int buffer_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,e
 		saa7146_pgtable_free(dev->pci, &buf->pt[2]);
 		saa7146_pgtable_alloc(dev->pci, &buf->pt[2]);
 
-		err = videobuf_iolock(dev->pci,&buf->vb, NULL);
+		err = videobuf_iolock(q,&buf->vb, NULL);
 		if (err)
 			goto oops;
 		err = saa7146_pgtable_build_single(dev->pci, &buf->pt[2], buf->vb.dma.sglist, buf->vb.dma.sglen);
@@ -261,7 +261,7 @@ static int buffer_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,e
 
  oops:
 	DEB_VBI(("error out.\n"));
-	saa7146_dma_free(dev,buf);
+	saa7146_dma_free(dev,q,buf);
 
 	return err;
 }
@@ -301,7 +301,7 @@ static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 	struct saa7146_buf *buf = (struct saa7146_buf *)vb;
 
 	DEB_VBI(("vb:%p\n",vb));
-	saa7146_dma_free(dev,buf);
+	saa7146_dma_free(dev,q,buf);
 }
 
 static struct videobuf_queue_ops vbi_qops = {

drivers/media/common/saa7146_video.c

@@ -1275,7 +1275,7 @@ static int buffer_prepare(struct videobuf_queue *q,
 	    buf->vb.field  != field      ||
 	    buf->vb.field  != fh->video_fmt.field  ||
 	    buf->fmt       != &fh->video_fmt) {
-		saa7146_dma_free(dev,buf);
+		saa7146_dma_free(dev,q,buf);
 	}
 
 	if (STATE_NEEDS_INIT == buf->vb.state) {
@@ -1304,7 +1304,7 @@ static int buffer_prepare(struct videobuf_queue *q,
 			saa7146_pgtable_alloc(dev->pci, &buf->pt[0]);
 		}
 
-		err = videobuf_iolock(dev->pci,&buf->vb, &vv->ov_fb);
+		err = videobuf_iolock(q,&buf->vb, &vv->ov_fb);
 		if (err)
 			goto oops;
 		err = saa7146_pgtable_build(dev,buf);
@@ -1318,7 +1318,7 @@ static int buffer_prepare(struct videobuf_queue *q,
 
  oops:
 	DEB_D(("error out.\n"));
-	saa7146_dma_free(dev,buf);
+	saa7146_dma_free(dev,q,buf);
 
 	return err;
 }
@@ -1363,7 +1363,7 @@ static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 	struct saa7146_buf *buf = (struct saa7146_buf *)vb;
 
 	DEB_CAP(("vbuf:%p\n",vb));
-	saa7146_dma_free(dev,buf);
+	saa7146_dma_free(dev,q,buf);
 }
 
 static struct videobuf_queue_ops video_qops = {

drivers/media/video/bttv-driver.c

@@ -1397,7 +1397,7 @@ bttv_switch_overlay(struct bttv *btv, struct bttv_fh *fh,
 		free_btres(btv,fh,RESOURCE_OVERLAY);
 	if (NULL != old) {
 		dprintk("switch_overlay: old=%p state is %d\n",old,old->vb.state);
-		bttv_dma_free(btv, old);
+		bttv_dma_free(&fh->cap,btv, old);
 		kfree(old);
 	}
 	dprintk("switch_overlay: done\n");
@@ -1407,7 +1407,8 @@ bttv_switch_overlay(struct bttv *btv, struct bttv_fh *fh,
 /* ----------------------------------------------------------------------- */
 /* video4linux (1) interface                                               */
 
-static int bttv_prepare_buffer(struct bttv *btv, struct bttv_buffer *buf,
+static int bttv_prepare_buffer(struct videobuf_queue *q,struct bttv *btv,
+			       struct bttv_buffer *buf,
 			       const struct bttv_format *fmt,
 			       unsigned int width, unsigned int height,
 			       enum v4l2_field field)
@@ -1450,7 +1451,7 @@ static int bttv_prepare_buffer(struct bttv *btv, struct bttv_buffer *buf,
 	/* alloc risc memory */
 	if (STATE_NEEDS_INIT == buf->vb.state) {
 		redo_dma_risc = 1;
-		if (0 != (rc = videobuf_iolock(btv->c.pci,&buf->vb,&btv->fbuf)))
+		if (0 != (rc = videobuf_iolock(q,&buf->vb,&btv->fbuf)))
 			goto fail;
 	}
 
@@ -1462,7 +1463,7 @@ static int bttv_prepare_buffer(struct bttv *btv, struct bttv_buffer *buf,
 	return 0;
 
  fail:
-	bttv_dma_free(btv,buf);
+	bttv_dma_free(q,btv,buf);
 	return rc;
 }
 
@@ -1486,7 +1487,7 @@ buffer_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
 	struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb);
 	struct bttv_fh *fh = q->priv_data;
 
-	return bttv_prepare_buffer(fh->btv, buf, fh->fmt,
+	return bttv_prepare_buffer(q,fh->btv, buf, fh->fmt,
 				   fh->width, fh->height, field);
 }
 
@@ -1510,7 +1511,7 @@ static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 	struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb);
 	struct bttv_fh *fh = q->priv_data;
 
-	bttv_dma_free(fh->btv,buf);
+	bttv_dma_free(&fh->cap,fh->btv,buf);
 }
 
 static struct videobuf_queue_ops bttv_video_qops = {
@@ -2496,7 +2497,7 @@ static int bttv_do_ioctl(struct inode *inode, struct file *file,
 		field = (vm->height > bttv_tvnorms[btv->tvnorm].sheight/2)
 			? V4L2_FIELD_INTERLACED
 			: V4L2_FIELD_BOTTOM;
-		retval = bttv_prepare_buffer(btv,buf,
+		retval = bttv_prepare_buffer(&fh->cap,btv,buf,
 					     format_by_palette(vm->format),
 					     vm->width,vm->height,field);
 		if (0 != retval)
@@ -2528,8 +2529,8 @@ static int bttv_do_ioctl(struct inode *inode, struct file *file,
 			retval = -EIO;
 			/* fall through */
 		case STATE_DONE:
-			videobuf_dma_pci_sync(btv->c.pci,&buf->vb.dma);
-			bttv_dma_free(btv,buf);
+			videobuf_dma_sync(&fh->cap,&buf->vb.dma);
+			bttv_dma_free(&fh->cap,btv,buf);
 			break;
 		default:
 			retval = -EINVAL;

drivers/media/video/bttv-risc.c

@@ -509,11 +509,11 @@ bttv_risc_hook(struct bttv *btv, int slot, struct btcx_riscmem *risc,
 }
 
 void
-bttv_dma_free(struct bttv *btv, struct bttv_buffer *buf)
+bttv_dma_free(struct videobuf_queue *q,struct bttv *btv, struct bttv_buffer *buf)
 {
 	BUG_ON(in_interrupt());
 	videobuf_waiton(&buf->vb,0,0);
-	videobuf_dma_pci_unmap(btv->c.pci, &buf->vb.dma);
+	videobuf_dma_unmap(q, &buf->vb.dma);
 	videobuf_dma_free(&buf->vb.dma);
 	btcx_riscmem_free(btv->c.pci,&buf->bottom);
 	btcx_riscmem_free(btv->c.pci,&buf->top);

drivers/media/video/bttv-vbi.c

@@ -96,7 +96,7 @@ static int vbi_buffer_prepare(struct videobuf_queue *q,
 		return -EINVAL;
 
 	if (STATE_NEEDS_INIT == buf->vb.state) {
-		if (0 != (rc = videobuf_iolock(btv->c.pci, &buf->vb, NULL)))
+		if (0 != (rc = videobuf_iolock(q, &buf->vb, NULL)))
 			goto fail;
 		if (0 != (rc = vbi_buffer_risc(btv,buf,fh->lines)))
 			goto fail;
@@ -109,7 +109,7 @@ static int vbi_buffer_prepare(struct videobuf_queue *q,
 	return 0;
 
  fail:
-	bttv_dma_free(btv,buf);
+	bttv_dma_free(q,btv,buf);
 	return rc;
 }
 
@@ -136,7 +136,7 @@ static void vbi_buffer_release(struct videobuf_queue *q, struct videobuf_buffer
 	struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb);
 
 	dprintk("free %p\n",vb);
-	bttv_dma_free(fh->btv,buf);
+	bttv_dma_free(&fh->cap,fh->btv,buf);
 }
 
 struct videobuf_queue_ops bttv_vbi_qops = {

drivers/media/video/bttvp.h

@@ -190,7 +190,8 @@ int bttv_buffer_activate_video(struct bttv *btv,
 			       struct bttv_buffer_set *set);
 int bttv_buffer_activate_vbi(struct bttv *btv,
 			     struct bttv_buffer *vbi);
-void bttv_dma_free(struct bttv *btv, struct bttv_buffer *buf);
+void bttv_dma_free(struct videobuf_queue *q, struct bttv *btv,
+		   struct bttv_buffer *buf);
 
 /* overlay handling */
 int bttv_overlay_risc(struct bttv *btv, struct bttv_overlay *ov,

drivers/media/video/cx88/cx88-alsa.c

@@ -303,7 +303,7 @@ static int dsp_buffer_free(snd_cx88_card_t *chip)
 	BUG_ON(!chip->dma_size);
 
 	dprintk(2,"Freeing buffer\n");
-	videobuf_dma_pci_unmap(chip->pci, &chip->dma_risc);
+	videobuf_pci_dma_unmap(chip->pci, &chip->dma_risc);
 	videobuf_dma_free(&chip->dma_risc);
 	btcx_riscmem_free(chip->pci,&chip->buf->risc);
 	kfree(chip->buf);
@@ -429,7 +429,7 @@ static int snd_cx88_hw_params(struct snd_pcm_substream * substream,
 	videobuf_dma_init_kernel(&buf->vb.dma,PCI_DMA_FROMDEVICE,
 			(PAGE_ALIGN(buf->vb.size) >> PAGE_SHIFT));
 
-	videobuf_dma_pci_map(chip->pci,&buf->vb.dma);
+	videobuf_pci_dma_map(chip->pci,&buf->vb.dma);
 
 
 	cx88_risc_databuffer(chip->pci, &buf->risc,

drivers/media/video/cx88/cx88-blackbird.c

@@ -1341,7 +1341,7 @@ bb_buf_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
 	       enum v4l2_field field)
 {
 	struct cx8802_fh *fh = q->priv_data;
-	return cx8802_buf_prepare(fh->dev, (struct cx88_buffer*)vb, field);
+	return cx8802_buf_prepare(q, fh->dev, (struct cx88_buffer*)vb, field);
 }
 
 static void
@@ -1354,8 +1354,7 @@ bb_buf_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
 static void
 bb_buf_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 {
-	struct cx8802_fh *fh = q->priv_data;
-	cx88_free_buffer(fh->dev->pci, (struct cx88_buffer*)vb);
+	cx88_free_buffer(q, (struct cx88_buffer*)vb);
 }
 
 static struct videobuf_queue_ops blackbird_qops = {

drivers/media/video/cx88/cx88-core.c

@@ -213,13 +213,13 @@ int cx88_risc_stopper(struct pci_dev *pci, struct btcx_riscmem *risc,
 }
 
 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;
 }
 

drivers/media/video/cx88/cx88-dvb.c

@@ -90,7 +90,7 @@ static int dvb_buf_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
 			   enum v4l2_field field)
 {
 	struct cx8802_dev *dev = q->priv_data;
-	return cx8802_buf_prepare(dev, (struct cx88_buffer*)vb,field);
+	return cx8802_buf_prepare(q, dev, (struct cx88_buffer*)vb,field);
 }
 
 static void dvb_buf_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
@@ -101,8 +101,7 @@ static void dvb_buf_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
 
 static void dvb_buf_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 {
-	struct cx8802_dev *dev = q->priv_data;
-	cx88_free_buffer(dev->pci, (struct cx88_buffer*)vb);
+	cx88_free_buffer(q, (struct cx88_buffer*)vb);
 }
 
 static struct videobuf_queue_ops dvb_qops = {

drivers/media/video/cx88/cx88-mpeg.c

@@ -163,8 +163,8 @@ static int cx8802_restart_queue(struct cx8802_dev    *dev,
 
 /* ------------------------------------------------------------------ */
 
-int cx8802_buf_prepare(struct cx8802_dev *dev, struct cx88_buffer *buf,
-			enum v4l2_field field)
+int cx8802_buf_prepare(struct videobuf_queue *q, struct cx8802_dev *dev,
+			struct cx88_buffer *buf, enum v4l2_field field)
 {
 	int size = dev->ts_packet_size * dev->ts_packet_count;
 	int rc;
@@ -179,7 +179,7 @@ int cx8802_buf_prepare(struct cx8802_dev *dev, struct cx88_buffer *buf,
 		buf->vb.size   = size;
 		buf->vb.field  = field /*V4L2_FIELD_TOP*/;
 
-		if (0 != (rc = videobuf_iolock(dev->pci,&buf->vb,NULL)))
+		if (0 != (rc = videobuf_iolock(q,&buf->vb,NULL)))
 			goto fail;
 		cx88_risc_databuffer(dev->pci, &buf->risc,
 				     buf->vb.dma.sglist,
@@ -189,36 +189,36 @@ int cx8802_buf_prepare(struct cx8802_dev *dev, struct cx88_buffer *buf,
 	return 0;
 
  fail:
-	cx88_free_buffer(dev->pci,buf);
+	cx88_free_buffer(q,buf);
 	return rc;
 }
 
 void cx8802_buf_queue(struct cx8802_dev *dev, struct cx88_buffer *buf)
 {
 	struct cx88_buffer    *prev;
-	struct cx88_dmaqueue  *q    = &dev->mpegq;
+	struct cx88_dmaqueue  *cx88q = &dev->mpegq;
 
 	dprintk( 1, "cx8802_buf_queue\n" );
 	/* add jump to stopper */
 	buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);
-	buf->risc.jmp[1] = cpu_to_le32(q->stopper.dma);
+	buf->risc.jmp[1] = cpu_to_le32(cx88q->stopper.dma);
 
-	if (list_empty(&q->active)) {
+	if (list_empty(&cx88q->active)) {
 		dprintk( 0, "queue is empty - first active\n" );
-		list_add_tail(&buf->vb.queue,&q->active);
-		cx8802_start_dma(dev, q, buf);
+		list_add_tail(&buf->vb.queue,&cx88q->active);
+		cx8802_start_dma(dev, cx88q, buf);
 		buf->vb.state = STATE_ACTIVE;
-		buf->count    = q->count++;
-		mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);
+		buf->count    = cx88q->count++;
+		mod_timer(&cx88q->timeout, jiffies+BUFFER_TIMEOUT);
 		dprintk(0,"[%p/%d] %s - first active\n",
 			buf, buf->vb.i, __FUNCTION__);
 
 	} else {
 		dprintk( 1, "queue is not empty - append to active\n" );
-		prev = list_entry(q->active.prev, struct cx88_buffer, vb.queue);
-		list_add_tail(&buf->vb.queue,&q->active);
+		prev = list_entry(cx88q->active.prev, struct cx88_buffer, vb.queue);
+		list_add_tail(&buf->vb.queue,&cx88q->active);
 		buf->vb.state = STATE_ACTIVE;
-		buf->count    = q->count++;
+		buf->count    = cx88q->count++;
 		prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
 		dprintk( 1, "[%p/%d] %s - append to active\n",
 			buf, buf->vb.i, __FUNCTION__);

drivers/media/video/cx88/cx88-vbi.c

@@ -175,7 +175,7 @@ vbi_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
 		buf->vb.size   = size;
 		buf->vb.field  = V4L2_FIELD_SEQ_TB;
 
-		if (0 != (rc = videobuf_iolock(dev->pci,&buf->vb,NULL)))
+		if (0 != (rc = videobuf_iolock(q,&buf->vb,NULL)))
 			goto fail;
 		cx88_risc_buffer(dev->pci, &buf->risc,
 				 buf->vb.dma.sglist,
@@ -187,7 +187,7 @@ vbi_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
 	return 0;
 
  fail:
-	cx88_free_buffer(dev->pci,buf);
+	cx88_free_buffer(q,buf);
 	return rc;
 }
 
@@ -227,9 +227,8 @@ vbi_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
 static void vbi_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 {
 	struct cx88_buffer *buf = container_of(vb,struct cx88_buffer,vb);
-	struct cx8800_fh   *fh  = q->priv_data;
 
-	cx88_free_buffer(fh->dev->pci,buf);
+	cx88_free_buffer(q,buf);
 }
 
 struct videobuf_queue_ops cx8800_vbi_qops = {