[media] cx18: mmap() support for raw YUV video capture

Add support for mmap method streaming of raw YUV video on cx18-based
hardware, in addition to the existing support for read() streaming of
raw YUV and MPEG-2 encoded video.

[simon.farnsworth@onelan.co.uk: I forward-ported this from Steven's original work,
 done under contract to ONELAN. The original code is at
 http://www.kernellabs.com/hg/~stoth/cx18-videobuf]

Signed-off-by: Steven Toth <stoth@kernellabs.com>
Signed-off-by: Simon Farnsworth <simon.farnsworth@onelan.co.uk>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/media/video/cx18/cx18-driver.h b/drivers/media/video/cx18/cx18-driver.h
index b86a740c68df..70e1e0401645 100644
--- a/drivers/media/video/cx18/cx18-driver.h
+++ b/drivers/media/video/cx18/cx18-driver.h
@@ -65,6 +65,10 @@
 #include "dvb_net.h"
 #include "dvbdev.h"
 
+/* Videobuf / YUV support */
+#include <media/videobuf-core.h>
+#include <media/videobuf-vmalloc.h>
+
 #ifndef CONFIG_PCI
 #  error "This driver requires kernel PCI support."
 #endif
@@ -403,6 +407,23 @@ struct cx18_stream {
         struct cx18_queue q_idle;       /* idle - not in rotation */
 
         struct work_struct out_work_order;
+
+        /* Videobuf for YUV video */
+        u32 pixelformat;
+        struct list_head vb_capture;    /* video capture queue */
+        spinlock_t vb_lock;
+        struct v4l2_framebuffer fbuf;
+        v4l2_std_id tvnorm; /* selected tv norm */
+        struct timer_list vb_timeout;
+        int vbwidth;
+        int vbheight;
+};
+
+struct cx18_videobuf_buffer {
+        /* Common video buffer sub-system struct */
+        struct videobuf_buffer vb;
+        v4l2_std_id tvnorm; /* selected tv norm */
+        u32 bytes_used;
 };
 
 struct cx18_open_id {
@@ -410,6 +431,10 @@ struct cx18_open_id {
         u32 open_id;
         int type;
         struct cx18 *cx;
+
+        struct videobuf_queue vbuf_q;
+        spinlock_t s_lock; /* Protect vbuf_q */
+        enum v4l2_buf_type vb_type;
 };
 
 static inline struct cx18_open_id *fh2id(struct v4l2_fh *fh)