1 files changed, 201 insertions, 0 deletions

diff --git a/include/media/v4l2-mem2mem.h b/include/media/v4l2-mem2mem.h
new file mode 100644
index 000000000000..8d149f1c58d0
--- /dev/null
+++ b/include/media/v4l2-mem2mem.h
@@ -0,0 +1,201 @@
+/*
+ * Memory-to-memory device framework for Video for Linux 2.
+ *
+ * Helper functions for devices that use memory buffers for both source
+ * and destination.
+ *
+ * Copyright (c) 2009 Samsung Electronics Co., Ltd.
+ * Pawel Osciak, <p.osciak@samsung.com>
+ * Marek Szyprowski, <m.szyprowski@samsung.com>
+ *
+ * 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 of the
+ * License, or (at your option) any later version
+ */
+
+#ifndef _MEDIA_V4L2_MEM2MEM_H
+#define _MEDIA_V4L2_MEM2MEM_H
+
+#include <media/videobuf-core.h>
+
+/**
+ * struct v4l2_m2m_ops - mem-to-mem device driver callbacks
+ * @device_run: required. Begin the actual job (transaction) inside this
+ *              callback.
+ *              The job does NOT have to end before this callback returns
+ *              (and it will be the usual case). When the job finishes,
+ *              v4l2_m2m_job_finish() has to be called.
+ * @job_ready:  optional. Should return 0 if the driver does not have a job
+ *              fully prepared to run yet (i.e. it will not be able to finish a
+ *              transaction without sleeping). If not provided, it will be
+ *              assumed that one source and one destination buffer are all
+ *              that is required for the driver to perform one full transaction.
+ *              This method may not sleep.
+ * @job_abort:  required. Informs the driver that it has to abort the currently
+ *              running transaction as soon as possible (i.e. as soon as it can
+ *              stop the device safely; e.g. in the next interrupt handler),
+ *              even if the transaction would not have been finished by then.
+ *              After the driver performs the necessary steps, it has to call
+ *              v4l2_m2m_job_finish() (as if the transaction ended normally).
+ *              This function does not have to (and will usually not) wait
+ *              until the device enters a state when it can be stopped.
+ */
+struct v4l2_m2m_ops {
+        void (*device_run)(void *priv);
+        int (*job_ready)(void *priv);
+        void (*job_abort)(void *priv);
+};
+
+struct v4l2_m2m_dev;
+
+struct v4l2_m2m_queue_ctx {
+/* private: internal use only */
+        struct videobuf_queue   q;
+
+        /* Queue for buffers ready to be processed as soon as this
+         * instance receives access to the device */
+        struct list_head        rdy_queue;
+        u8                      num_rdy;
+};
+
+struct v4l2_m2m_ctx {
+/* private: internal use only */
+        struct v4l2_m2m_dev             *m2m_dev;
+
+        /* Capture (output to memory) queue context */
+        struct v4l2_m2m_queue_ctx       cap_q_ctx;
+
+        /* Output (input from memory) queue context */
+        struct v4l2_m2m_queue_ctx       out_q_ctx;
+
+        /* For device job queue */
+        struct list_head                queue;
+        unsigned long                   job_flags;
+
+        /* Instance private data */
+        void                            *priv;
+};
+
+void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev);
+
+struct videobuf_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx,
+                                       enum v4l2_buf_type type);
+
+void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
+                         struct v4l2_m2m_ctx *m2m_ctx);
+
+int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
+                     struct v4l2_requestbuffers *reqbufs);
+
+int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
+                      struct v4l2_buffer *buf);
+
+int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
+                  struct v4l2_buffer *buf);
+int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
+                   struct v4l2_buffer *buf);
+
+int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
+                      enum v4l2_buf_type type);
+int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
+                       enum v4l2_buf_type type);
+
+unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
+                           struct poll_table_struct *wait);
+
+int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
+                  struct vm_area_struct *vma);
+
+struct v4l2_m2m_dev *v4l2_m2m_init(struct v4l2_m2m_ops *m2m_ops);
+void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev);
+
+struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(void *priv, struct v4l2_m2m_dev *m2m_dev,
+                        void (*vq_init)(void *priv, struct videobuf_queue *,
+                                        enum v4l2_buf_type));
+void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx);
+
+void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx, struct videobuf_queue *vq,
+                        struct videobuf_buffer *vb);
+
+/**
+ * v4l2_m2m_num_src_bufs_ready() - return the number of source buffers ready for
+ * use
+ */
+static inline
+unsigned int v4l2_m2m_num_src_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
+{
+        return m2m_ctx->cap_q_ctx.num_rdy;
+}
+
+/**
+ * v4l2_m2m_num_src_bufs_ready() - return the number of destination buffers
+ * ready for use
+ */
+static inline
+unsigned int v4l2_m2m_num_dst_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
+{
+        return m2m_ctx->out_q_ctx.num_rdy;
+}
+
+void *v4l2_m2m_next_buf(struct v4l2_m2m_ctx *m2m_ctx, enum v4l2_buf_type type);
+
+/**
+ * v4l2_m2m_next_src_buf() - return next source buffer from the list of ready
+ * buffers
+ */
+static inline void *v4l2_m2m_next_src_buf(struct v4l2_m2m_ctx *m2m_ctx)
+{
+        return v4l2_m2m_next_buf(m2m_ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
+}
+
+/**
+ * v4l2_m2m_next_dst_buf() - return next destination buffer from the list of
+ * ready buffers
+ */
+static inline void *v4l2_m2m_next_dst_buf(struct v4l2_m2m_ctx *m2m_ctx)
+{
+        return v4l2_m2m_next_buf(m2m_ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);
+}
+
+/**
+ * v4l2_m2m_get_src_vq() - return videobuf_queue for source buffers
+ */
+static inline
+struct videobuf_queue *v4l2_m2m_get_src_vq(struct v4l2_m2m_ctx *m2m_ctx)
+{
+        return v4l2_m2m_get_vq(m2m_ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
+}
+
+/**
+ * v4l2_m2m_get_dst_vq() - return videobuf_queue for destination buffers
+ */
+static inline
+struct videobuf_queue *v4l2_m2m_get_dst_vq(struct v4l2_m2m_ctx *m2m_ctx)
+{
+        return v4l2_m2m_get_vq(m2m_ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);
+}
+
+void *v4l2_m2m_buf_remove(struct v4l2_m2m_ctx *m2m_ctx,
+                          enum v4l2_buf_type type);
+
+/**
+ * v4l2_m2m_src_buf_remove() - take off a source buffer from the list of ready
+ * buffers and return it
+ */
+static inline void *v4l2_m2m_src_buf_remove(struct v4l2_m2m_ctx *m2m_ctx)
+{
+        return v4l2_m2m_buf_remove(m2m_ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
+}
+
+/**
+ * v4l2_m2m_dst_buf_remove() - take off a destination buffer from the list of
+ * ready buffers and return it
+ */
+static inline void *v4l2_m2m_dst_buf_remove(struct v4l2_m2m_ctx *m2m_ctx)
+{
+        return v4l2_m2m_buf_remove(m2m_ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);
+}
+
+#endif /* _MEDIA_V4L2_MEM2MEM_H */
+