V4L/DVB (10571): v4l2-framework.txt: Fixes the videobuf init functions

Documents the driver usage functions, instead of the generic one used
by the videobuf specific handlers.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/Documentation/video4linux/v4l2-framework.txt b/Documentation/video4linux/v4l2-framework.txt
index 8d2db7e09e892c776c3e8ef27eacc035799ab679..48cdf86248cbe9d9e43547ec6c3f647112147916 100644 (file)
--- a/Documentation/video4linux/v4l2-framework.txt
+++ b/Documentation/video4linux/v4l2-framework.txt
@@ -558,26 +558,38 @@ announcing that a new buffer were filled.
 The irq handling code should handle the videobuf task lists, in order
 to advice videobuf that a new frame were filled, in order to honor to a
 request. The code is generally like this one:
-        if (list_empty(&dma_q->active))
+       if (list_empty(&dma_q->active))
                return;
 
-        buf = list_entry(dma_q->active.next, struct vbuffer, vb.queue);
+       buf = list_entry(dma_q->active.next, struct vbuffer, vb.queue);
 
-        if (!waitqueue_active(&buf->vb.done))
+       if (!waitqueue_active(&buf->vb.done))
                return;
 
        /* Some logic to handle the buf may be needed here */
 
-        list_del(&buf->vb.queue);
-        do_gettimeofday(&buf->vb.ts);
-        wake_up(&buf->vb.done);
+       list_del(&buf->vb.queue);
+       do_gettimeofday(&buf->vb.ts);
+       wake_up(&buf->vb.done);
 
 Those are the videobuffer functions used on drivers, implemented on
 videobuf-core:
 
-- videobuf_queue_core_init()
-  Initializes the videobuf infrastructure. This function should be
-  called before any other videobuf function.
+- Videobuf init functions
+  videobuf_queue_sg_init()
+      Initializes the videobuf infrastructure. This function should be
+      called before any other videobuf function on drivers that uses DMA
+      Scatter/Gather buffers.
+
+  videobuf_queue_dma_contig_init
+      Initializes the videobuf infrastructure. This function should be
+      called before any other videobuf function on drivers that need DMA
+      contiguous buffers.
+
+  videobuf_queue_vmalloc_init()
+      Initializes the videobuf infrastructure. This function should be
+      called before any other videobuf function on USB (and other drivers)
+      that need a vmalloced type of videobuf.
 
 - videobuf_iolock()
   Prepares the videobuf memory for the proper method (read, mmap, overlay).