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-rw-r--r--include/media/videobuf-core.h236
-rw-r--r--include/media/videobuf-dma-sg.h142
2 files changed, 378 insertions, 0 deletions
diff --git a/include/media/videobuf-core.h b/include/media/videobuf-core.h
new file mode 100644
index 00000000000..0ac21ae44f6
--- /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@infradead.org>
+ *
+ * Highly based on video-buf written originally by:
+ * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
+ * (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.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
+ */
+
+#include <linux/poll.h>
+#ifdef CONFIG_VIDEO_V4L1_COMPAT
+#include <linux/videodev.h>
+#endif
+#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 contingous 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;
+ unsigned long start;
+ unsigned long end;
+ struct videobuf_queue *q;
+};
+
+enum videobuf_state {
+ STATE_NEEDS_INIT = 0,
+ STATE_PREPARED = 1,
+ STATE_QUEUED = 2,
+ STATE_ACTIVE = 3,
+ STATE_DONE = 4,
+ STATE_ERROR = 5,
+ STATE_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;
+ unsigned int input;
+ 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;
+
+ /* 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;
+
+ void* (*alloc) (size_t size);
+ int (*iolock) (struct videobuf_queue* q,
+ struct videobuf_buffer *vb,
+ struct v4l2_framebuffer *fbuf);
+ int (*mmap) (struct videobuf_queue *q,
+ unsigned int *count,
+ unsigned int *size,
+ enum v4l2_memory memory);
+ int (*sync) (struct videobuf_queue* q,
+ struct videobuf_buffer *buf);
+ int (*copy_to_user) (struct videobuf_queue *q,
+ char __user *data,
+ size_t count,
+ int nonblocking);
+ int (*copy_stream) (struct videobuf_queue *q,
+ char __user *data,
+ size_t count,
+ size_t pos,
+ int vbihack,
+ int nonblocking);
+ int (*mmap_free) (struct videobuf_queue *q);
+ int (*mmap_mapper) (struct videobuf_queue *q,
+ struct vm_area_struct *vma);
+ int (*is_mmapped) (struct videobuf_buffer *buf);
+};
+
+struct videobuf_queue {
+ struct mutex lock;
+ spinlock_t *irqlock;
+ void *dev; /* on pci, points to struct pci_dev */
+
+ enum v4l2_buf_type type;
+ unsigned int inputs; /* for V4L2_BUF_FLAG_INPUT */
+ unsigned int msize;
+ enum v4l2_field field;
+ enum v4l2_field last; /* for field=V4L2_FIELD_ALTERNATE */
+ struct videobuf_buffer *bufs[VIDEO_MAX_FRAME];
+ struct videobuf_queue_ops *ops;
+ struct videobuf_qtype_ops *int_ops;
+
+ /* capture via mmap() + ioctl(QBUF/DQBUF) */
+ unsigned int streaming;
+ struct list_head stream;
+
+ /* capture via read() */
+ unsigned int reading;
+ unsigned int read_off;
+ struct videobuf_buffer *read_buf;
+
+ /* driver private data */
+ void *priv_data;
+
+ /*FIXME: should be removed after completing the vb conversion */
+ void *priv_ops;
+};
+
+int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr);
+int videobuf_iolock(struct videobuf_queue* q, struct videobuf_buffer *vb,
+ struct v4l2_framebuffer *fbuf);
+
+void *videobuf_alloc(struct videobuf_queue* q);
+
+void videobuf_queue_init(struct videobuf_queue *q,
+ struct videobuf_queue_ops *ops,
+ void *dev,
+ spinlock_t *irqlock,
+ enum v4l2_buf_type type,
+ enum v4l2_field field,
+ unsigned int msize,
+ void *priv);
+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);
+#ifdef CONFIG_VIDEO_V4L1_COMPAT
+int videobuf_cgmbuf(struct videobuf_queue *q,
+ struct video_mbuf *mbuf, int count);
+#endif
+int videobuf_streamon(struct videobuf_queue *q);
+int videobuf_streamoff(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);
+unsigned int 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_free(struct videobuf_queue *q);
+int videobuf_mmap_mapper(struct videobuf_queue *q,
+ struct vm_area_struct *vma);
+
+/* --------------------------------------------------------------------- */
+
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */
diff --git a/include/media/videobuf-dma-sg.h b/include/media/videobuf-dma-sg.h
new file mode 100644
index 00000000000..62a3709905f
--- /dev/null
+++ b/include/media/videobuf-dma-sg.h
@@ -0,0 +1,142 @@
+/*
+ * helper functions for PCI DMA video4linux capture buffers
+ *
+ * The functions expect the hardware being able to scatter gatter
+ * (i.e. the buffers are not linear in physical memory, but fragmented
+ * into PAGE_SIZE chunks). They also assume the driver does not need
+ * to touch the video data.
+ *
+ * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org>
+ *
+ * Highly based on video-buf written originally by:
+ * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
+ * (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.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
+ */
+
+#include <media/videobuf-core.h>
+
+/* --------------------------------------------------------------------- */
+
+/*
+ * Return a scatterlist for some page-aligned vmalloc()'ed memory
+ * block (NULL on errors). Memory for the scatterlist is allocated
+ * using kmalloc. The caller must free the memory.
+ */
+struct scatterlist* videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages);
+
+/*
+ * Return a scatterlist for a an array of userpages (NULL on errors).
+ * Memory for the scatterlist is allocated using kmalloc. The caller
+ * must free the memory.
+ */
+struct scatterlist* videobuf_pages_to_sg(struct page **pages, int nr_pages,
+ int offset);
+
+/* --------------------------------------------------------------------- */
+
+/*
+ * A small set of helper functions to manage buffers (both userland
+ * and kernel) for DMA.
+ *
+ * videobuf_dma_init_*()
+ * creates a buffer. The userland version takes a userspace
+ * pointer + length. The kernel version just wants the size and
+ * does memory allocation too using vmalloc_32().
+ *
+ * videobuf_dma_*()
+ * see Documentation/DMA-mapping.txt, these functions to
+ * basically the same. The map function does also build a
+ * scatterlist for the buffer (and unmap frees it ...)
+ *
+ * videobuf_dma_free()
+ * no comment ...
+ *
+ */
+
+struct videobuf_dmabuf {
+ u32 magic;
+
+ /* for userland buffer */
+ int offset;
+ struct page **pages;
+
+ /* for kernel buffers */
+ void *vmalloc;
+
+ /* Stores the userspace pointer to vmalloc area */
+ void *varea;
+
+ /* for overlay buffers (pci-pci dma) */
+ dma_addr_t bus_addr;
+
+ /* common */
+ struct scatterlist *sglist;
+ int sglen;
+ int nr_pages;
+ int direction;
+};
+
+struct videbuf_pci_sg_memory
+{
+ u32 magic;
+
+ /* for mmap'ed buffers */
+ struct videobuf_mapping *map;
+ struct videobuf_dmabuf dma;
+};
+
+/* FIXME: To be removed soon */
+typedef int (vb_map_sg_t)(void *dev, struct scatterlist *sglist, int nr_pages,
+ int direction);
+
+/* FIXME: To be removed soon */
+struct videobuf_dma_sg_ops
+{
+ vb_map_sg_t *vb_map_sg;
+ vb_map_sg_t *vb_dma_sync_sg;
+ vb_map_sg_t *vb_unmap_sg;
+
+};
+
+void videobuf_dma_init(struct videobuf_dmabuf *dma);
+int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
+ unsigned long data, unsigned long size);
+int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
+ int nr_pages);
+int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
+ dma_addr_t addr, int nr_pages);
+int videobuf_dma_free(struct videobuf_dmabuf *dma);
+
+int videobuf_dma_map(struct videobuf_queue* q,struct videobuf_dmabuf *dma);
+int videobuf_dma_sync(struct videobuf_queue* q,struct videobuf_dmabuf *dma);
+int videobuf_dma_unmap(struct videobuf_queue* q,struct videobuf_dmabuf *dma);
+struct videobuf_dmabuf *videobuf_to_dma (struct videobuf_buffer *buf);
+
+void *videobuf_pci_alloc (size_t size);
+
+void videobuf_queue_pci_init(struct videobuf_queue* q,
+ struct videobuf_queue_ops *ops,
+ void *dev,
+ spinlock_t *irqlock,
+ enum v4l2_buf_type type,
+ enum v4l2_field field,
+ unsigned int msize,
+ void *priv);
+
+ /*FIXME: these variants are used only on *-alsa code, where videobuf is
+ * used without queue
+ */
+int videobuf_pci_dma_map(struct pci_dev *pci,struct videobuf_dmabuf *dma);
+int videobuf_pci_dma_unmap(struct pci_dev *pci,struct videobuf_dmabuf *dma);
+
+/* FIXME: temporary routine for vivi and tm6000, while lacking implementation
+ * of videobuf-vmalloc
+ */
+void videobuf_set_pci_ops (struct videobuf_queue* q,
+ struct videobuf_dma_sg_ops *ops);
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-03 18:47:35 +0000