[media] marvell-cam: convert to videobuf2

This is a basic, naive conversion to the videobuf2 infrastructure, removing
a lot of code in the process.  For now, we're using vmalloc, which is
suboptimal, but it does match what the cafe driver did before.  In the cafe
case, it may have to stay that way just because memory is too tight to do
direct streaming; mmp-camera will be able to do better.
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/marvell-ccic/Kconfig

@@ -2,6 +2,7 @@ config VIDEO_CAFE_CCIC
 	tristate "Marvell 88ALP01 (Cafe) CMOS Camera Controller support"
 	depends on PCI && I2C && VIDEO_V4L2
 	select VIDEO_OV7670
+	select VIDEOBUF2_VMALLOC
 	---help---
 	  This is a video4linux2 driver for the Marvell 88ALP01 integrated
 	  CMOS camera controller.  This is the controller found on first-
@@ -12,6 +13,7 @@ config VIDEO_MMP_CAMERA
 	depends on ARCH_MMP && I2C && VIDEO_V4L2
 	select VIDEO_OV7670
 	select I2C_GPIO
+	select VIDEOBUF2_VMALLOC
 	---help---
 	  This is a Video4Linux2 driver for the integrated camera
 	  controller found on Marvell Armada 610 application

drivers/media/video/marvell-ccic/mcam-core.h

@@ -3,6 +3,13 @@
  *
  * Copyright 2011 Jonathan Corbet corbet@lwn.net
  */
+#ifndef _MCAM_CORE_H
+#define _MCAM_CORE_H
+
+#include <linux/list.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-dev.h>
+#include <media/videobuf2-core.h>
 
 /*
  * Tracking of streaming I/O buffers.
@@ -20,8 +27,6 @@ enum mcam_state {
 	S_NOTREADY,	/* Not yet initialized */
 	S_IDLE,		/* Just hanging around */
 	S_FLAKED,	/* Some sort of problem */
-	S_SINGLEREAD,	/* In read() */
-	S_SPECREAD,	/* Speculative read (for future read()) */
 	S_STREAMING	/* Streaming data */
 };
 #define MAX_DMA_BUFS 3
@@ -70,21 +75,19 @@ struct mcam_camera {
 
 	struct list_head dev_list;	/* link to other devices */
 
+	/* Videobuf2 stuff */
+	struct vb2_queue vb_queue;
+	struct list_head buffers;	/* Available frames */
+
 	/* DMA buffers */
 	unsigned int nbufs;		/* How many are alloc'd */
 	int next_buf;			/* Next to consume (dev_lock) */
 	unsigned int dma_buf_size;	/* allocated size */
 	void *dma_bufs[MAX_DMA_BUFS];	/* Internal buffer addresses */
 	dma_addr_t dma_handles[MAX_DMA_BUFS]; /* Buffer bus addresses */
-	unsigned int specframes;	/* Unconsumed spec frames (dev_lock) */
 	unsigned int sequence;		/* Frame sequence number */
-	unsigned int buf_seq[MAX_DMA_BUFS]; /* Sequence for individual buffers */
+	unsigned int buf_seq[MAX_DMA_BUFS]; /* Sequence for individual bufs */
 
-	/* Streaming buffers */
-	unsigned int n_sbufs;		/* How many we have */
-	struct mcam_sio_buffer *sb_bufs; /* The array of housekeeping structs */
-	struct list_head sb_avail;	/* Available for data (we own) (dev_lock) */
-	struct list_head sb_full;	/* With data (user space owns) (dev_lock) */
 	struct tasklet_struct s_tasklet;
 
 	/* Current operating parameters */
@@ -94,9 +97,6 @@ struct mcam_camera {
 
 	/* Locks */
 	struct mutex s_mutex; /* Access to this structure */
-
-	/* Misc */
-	wait_queue_head_t iowait;	/* Waiting on frame data */
 };
 
 
@@ -257,3 +257,5 @@ int mccic_resume(struct mcam_camera *cam);
  */
 #define VGA_WIDTH	640
 #define VGA_HEIGHT	480
+
+#endif /* _MCAM_CORE_H */