Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 236 insertions, 0 deletions

diff --git a/include/media/videobuf-core.h b/include/media/videobuf-core.h
new file mode 100644
index 000000000..60a664feb
--- /dev/null
+++ b/include/media/videobuf-core.h
@@ -0,0 +1,236 @@
+/*
+ * generic helper functions for handling video4linux capture buffers
+ *
+ * (c) 2007 Mauro Carvalho Chehab, <mchehab@kernel.org>
+ *
+ * Highly based on video-buf written originally by:
+ * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
+ * (c) 2006 Mauro Carvalho Chehab, <mchehab@kernel.org>
+ * (c) 2006 Ted Walther and John Sokol
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2
+ */
+
+#ifndef _VIDEOBUF_CORE_H
+#define _VIDEOBUF_CORE_H
+
+#include <linux/poll.h>
+#include <linux/videodev2.h>
+
+#define UNSET (-1U)
+
+
+struct videobuf_buffer;
+struct videobuf_queue;
+
+/* --------------------------------------------------------------------- */
+
+/*
+ * A small set of helper functions to manage video4linux buffers.
+ *
+ * struct videobuf_buffer holds the data structures used by the helper
+ * functions, additionally some commonly used fields for v4l buffers
+ * (width, height, lists, waitqueue) are in there.  That struct should
+ * be used as first element in the drivers buffer struct.
+ *
+ * about the mmap helpers (videobuf_mmap_*):
+ *
+ * The mmaper function allows to map any subset of contiguous buffers.
+ * This includes one mmap() call for all buffers (which the original
+ * video4linux API uses) as well as one mmap() for every single buffer
+ * (which v4l2 uses).
+ *
+ * If there is a valid mapping for a buffer, buffer->baddr/bsize holds
+ * userspace address + size which can be feeded into the
+ * videobuf_dma_init_user function listed above.
+ *
+ */
+
+struct videobuf_mapping {
+	unsigned int count;
+	struct videobuf_queue *q;
+};
+
+enum videobuf_state {
+	VIDEOBUF_NEEDS_INIT = 0,
+	VIDEOBUF_PREPARED   = 1,
+	VIDEOBUF_QUEUED     = 2,
+	VIDEOBUF_ACTIVE     = 3,
+	VIDEOBUF_DONE       = 4,
+	VIDEOBUF_ERROR      = 5,
+	VIDEOBUF_IDLE       = 6,
+};
+
+struct videobuf_buffer {
+	unsigned int            i;
+	u32                     magic;
+
+	/* info about the buffer */
+	unsigned int            width;
+	unsigned int            height;
+	unsigned int            bytesperline; /* use only if != 0 */
+	unsigned long           size;
+	enum v4l2_field         field;
+	enum videobuf_state     state;
+	struct list_head        stream;  /* QBUF/DQBUF list */
+
+	/* touched by irq handler */
+	struct list_head        queue;
+	wait_queue_head_t       done;
+	unsigned int            field_count;
+	struct timeval          ts;
+
+	/* Memory type */
+	enum v4l2_memory        memory;
+
+	/* buffer size */
+	size_t                  bsize;
+
+	/* buffer offset (mmap + overlay) */
+	size_t                  boff;
+
+	/* buffer addr (userland ptr!) */
+	unsigned long           baddr;
+
+	/* for mmap'ed buffers */
+	struct videobuf_mapping *map;
+
+	/* Private pointer to allow specific methods to store their data */
+	int			privsize;
+	void                    *priv;
+};
+
+struct videobuf_queue_ops {
+	int (*buf_setup)(struct videobuf_queue *q,
+			 unsigned int *count, unsigned int *size);
+	int (*buf_prepare)(struct videobuf_queue *q,
+			   struct videobuf_buffer *vb,
+			   enum v4l2_field field);
+	void (*buf_queue)(struct videobuf_queue *q,
+			  struct videobuf_buffer *vb);
+	void (*buf_release)(struct videobuf_queue *q,
+			    struct videobuf_buffer *vb);
+};
+
+#define MAGIC_QTYPE_OPS	0x12261003
+
+/* Helper operations - device type dependent */
+struct videobuf_qtype_ops {
+	u32                     magic;
+
+	struct videobuf_buffer *(*alloc_vb)(size_t size);
+	void *(*vaddr)		(struct videobuf_buffer *buf);
+	int (*iolock)		(struct videobuf_queue *q,
+				 struct videobuf_buffer *vb,
+				 struct v4l2_framebuffer *fbuf);
+	int (*sync)		(struct videobuf_queue *q,
+				 struct videobuf_buffer *buf);
+	int (*mmap_mapper)	(struct videobuf_queue *q,
+				 struct videobuf_buffer *buf,
+				 struct vm_area_struct *vma);
+};
+
+struct videobuf_queue {
+	struct mutex               vb_lock;
+	struct mutex               *ext_lock;
+	spinlock_t                 *irqlock;
+	struct device		   *dev;
+
+	wait_queue_head_t	   wait; /* wait if queue is empty */
+
+	enum v4l2_buf_type         type;
+	unsigned int               msize;
+	enum v4l2_field            field;
+	enum v4l2_field            last;   /* for field=V4L2_FIELD_ALTERNATE */
+	struct videobuf_buffer     *bufs[VIDEO_MAX_FRAME];
+	const struct videobuf_queue_ops  *ops;
+	struct videobuf_qtype_ops  *int_ops;
+
+	unsigned int               streaming:1;
+	unsigned int               reading:1;
+
+	/* capture via mmap() + ioctl(QBUF/DQBUF) */
+	struct list_head           stream;
+
+	/* capture via read() */
+	unsigned int               read_off;
+	struct videobuf_buffer     *read_buf;
+
+	/* driver private data */
+	void                       *priv_data;
+};
+
+static inline void videobuf_queue_lock(struct videobuf_queue *q)
+{
+	if (!q->ext_lock)
+		mutex_lock(&q->vb_lock);
+}
+
+static inline void videobuf_queue_unlock(struct videobuf_queue *q)
+{
+	if (!q->ext_lock)
+		mutex_unlock(&q->vb_lock);
+}
+
+int videobuf_waiton(struct videobuf_queue *q, struct videobuf_buffer *vb,
+		int non_blocking, int intr);
+int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb,
+		struct v4l2_framebuffer *fbuf);
+
+struct videobuf_buffer *videobuf_alloc_vb(struct videobuf_queue *q);
+
+/* Used on videobuf-dvb */
+void *videobuf_queue_to_vaddr(struct videobuf_queue *q,
+			      struct videobuf_buffer *buf);
+
+void videobuf_queue_core_init(struct videobuf_queue *q,
+			 const struct videobuf_queue_ops *ops,
+			 struct device *dev,
+			 spinlock_t *irqlock,
+			 enum v4l2_buf_type type,
+			 enum v4l2_field field,
+			 unsigned int msize,
+			 void *priv,
+			 struct videobuf_qtype_ops *int_ops,
+			 struct mutex *ext_lock);
+int  videobuf_queue_is_busy(struct videobuf_queue *q);
+void videobuf_queue_cancel(struct videobuf_queue *q);
+
+enum v4l2_field videobuf_next_field(struct videobuf_queue *q);
+int videobuf_reqbufs(struct videobuf_queue *q,
+		     struct v4l2_requestbuffers *req);
+int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b);
+int videobuf_qbuf(struct videobuf_queue *q,
+		  struct v4l2_buffer *b);
+int videobuf_dqbuf(struct videobuf_queue *q,
+		   struct v4l2_buffer *b, int nonblocking);
+int videobuf_streamon(struct videobuf_queue *q);
+int videobuf_streamoff(struct videobuf_queue *q);
+
+void videobuf_stop(struct videobuf_queue *q);
+
+int videobuf_read_start(struct videobuf_queue *q);
+void videobuf_read_stop(struct videobuf_queue *q);
+ssize_t videobuf_read_stream(struct videobuf_queue *q,
+			     char __user *data, size_t count, loff_t *ppos,
+			     int vbihack, int nonblocking);
+ssize_t videobuf_read_one(struct videobuf_queue *q,
+			  char __user *data, size_t count, loff_t *ppos,
+			  int nonblocking);
+__poll_t videobuf_poll_stream(struct file *file,
+				  struct videobuf_queue *q,
+				  poll_table *wait);
+
+int videobuf_mmap_setup(struct videobuf_queue *q,
+			unsigned int bcount, unsigned int bsize,
+			enum v4l2_memory memory);
+int __videobuf_mmap_setup(struct videobuf_queue *q,
+			unsigned int bcount, unsigned int bsize,
+			enum v4l2_memory memory);
+int videobuf_mmap_free(struct videobuf_queue *q);
+int videobuf_mmap_mapper(struct videobuf_queue *q,
+			 struct vm_area_struct *vma);
+
+#endif