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authorMauro Carvalho Chehab <mchehab@redhat.com>2012-08-14 17:31:16 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2012-08-15 16:43:09 -0300
commit2c3fb08b3f74b8792004095a1f6881a3296ff643 (patch)
tree19be9d09c4aa66d4363ee9d38a43721f5d6b144f /drivers/media/platform/omap3isp/ispqueue.h
parent2a2d1cf46500ab7599d0b45ee837f3936763ccac (diff)
[media] rename drivers/media/video as .../platform
The remaining drivers are mostly platform drivers. Name the dir to reflect it. It makes sense to latter break it into a few other dirs. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/platform/omap3isp/ispqueue.h')
-rw-r--r--drivers/media/platform/omap3isp/ispqueue.h187
1 files changed, 187 insertions, 0 deletions
diff --git a/drivers/media/platform/omap3isp/ispqueue.h b/drivers/media/platform/omap3isp/ispqueue.h
new file mode 100644
index 000000000000..908dfd712e8e
--- /dev/null
+++ b/drivers/media/platform/omap3isp/ispqueue.h
@@ -0,0 +1,187 @@
+/*
+ * ispqueue.h
+ *
+ * TI OMAP3 ISP - Video buffers queue handling
+ *
+ * Copyright (C) 2010 Nokia Corporation
+ *
+ * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+ * Sakari Ailus <sakari.ailus@iki.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#ifndef OMAP3_ISP_QUEUE_H
+#define OMAP3_ISP_QUEUE_H
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/videodev2.h>
+#include <linux/wait.h>
+
+struct isp_video_queue;
+struct page;
+struct scatterlist;
+
+#define ISP_VIDEO_MAX_BUFFERS 16
+
+/**
+ * enum isp_video_buffer_state - ISP video buffer state
+ * @ISP_BUF_STATE_IDLE: The buffer is under userspace control (dequeued
+ * or not queued yet).
+ * @ISP_BUF_STATE_QUEUED: The buffer has been queued but isn't used by the
+ * device yet.
+ * @ISP_BUF_STATE_ACTIVE: The buffer is in use for an active video transfer.
+ * @ISP_BUF_STATE_ERROR: The device is done with the buffer and an error
+ * occurred. For capture device the buffer likely contains corrupted data or
+ * no data at all.
+ * @ISP_BUF_STATE_DONE: The device is done with the buffer and no error occurred.
+ * For capture devices the buffer contains valid data.
+ */
+enum isp_video_buffer_state {
+ ISP_BUF_STATE_IDLE,
+ ISP_BUF_STATE_QUEUED,
+ ISP_BUF_STATE_ACTIVE,
+ ISP_BUF_STATE_ERROR,
+ ISP_BUF_STATE_DONE,
+};
+
+/**
+ * struct isp_video_buffer - ISP video buffer
+ * @vma_use_count: Number of times the buffer is mmap'ed to userspace
+ * @stream: List head for insertion into main queue
+ * @queue: ISP buffers queue this buffer belongs to
+ * @prepared: Whether the buffer has been prepared
+ * @skip_cache: Whether to skip cache management operations for this buffer
+ * @vaddr: Memory virtual address (for kernel buffers)
+ * @vm_flags: Buffer VMA flags (for userspace buffers)
+ * @offset: Offset inside the first page (for userspace buffers)
+ * @npages: Number of pages (for userspace buffers)
+ * @pages: Pages table (for userspace non-VM_PFNMAP buffers)
+ * @paddr: Memory physical address (for userspace VM_PFNMAP buffers)
+ * @sglen: Number of elements in the scatter list (for non-VM_PFNMAP buffers)
+ * @sglist: Scatter list (for non-VM_PFNMAP buffers)
+ * @vbuf: V4L2 buffer
+ * @irqlist: List head for insertion into IRQ queue
+ * @state: Current buffer state
+ * @wait: Wait queue to signal buffer completion
+ */
+struct isp_video_buffer {
+ unsigned long vma_use_count;
+ struct list_head stream;
+ struct isp_video_queue *queue;
+ unsigned int prepared:1;
+ bool skip_cache;
+
+ /* For kernel buffers. */
+ void *vaddr;
+
+ /* For userspace buffers. */
+ vm_flags_t vm_flags;
+ unsigned long offset;
+ unsigned int npages;
+ struct page **pages;
+ dma_addr_t paddr;
+
+ /* For all buffers except VM_PFNMAP. */
+ unsigned int sglen;
+ struct scatterlist *sglist;
+
+ /* Touched by the interrupt handler. */
+ struct v4l2_buffer vbuf;
+ struct list_head irqlist;
+ enum isp_video_buffer_state state;
+ wait_queue_head_t wait;
+};
+
+#define to_isp_video_buffer(vb) container_of(vb, struct isp_video_buffer, vb)
+
+/**
+ * struct isp_video_queue_operations - Driver-specific operations
+ * @queue_prepare: Called before allocating buffers. Drivers should clamp the
+ * number of buffers according to their requirements, and must return the
+ * buffer size in bytes.
+ * @buffer_prepare: Called the first time a buffer is queued, or after changing
+ * the userspace memory address for a USERPTR buffer, with the queue lock
+ * held. Drivers should perform device-specific buffer preparation (such as
+ * mapping the buffer memory in an IOMMU). This operation is optional.
+ * @buffer_queue: Called when a buffer is being added to the queue with the
+ * queue irqlock spinlock held.
+ * @buffer_cleanup: Called before freeing buffers, or before changing the
+ * userspace memory address for a USERPTR buffer, with the queue lock held.
+ * Drivers must perform cleanup operations required to undo the
+ * buffer_prepare call. This operation is optional.
+ */
+struct isp_video_queue_operations {
+ void (*queue_prepare)(struct isp_video_queue *queue,
+ unsigned int *nbuffers, unsigned int *size);
+ int (*buffer_prepare)(struct isp_video_buffer *buf);
+ void (*buffer_queue)(struct isp_video_buffer *buf);
+ void (*buffer_cleanup)(struct isp_video_buffer *buf);
+};
+
+/**
+ * struct isp_video_queue - ISP video buffers queue
+ * @type: Type of video buffers handled by this queue
+ * @ops: Queue operations
+ * @dev: Device used for DMA operations
+ * @bufsize: Size of a driver-specific buffer object
+ * @count: Number of currently allocated buffers
+ * @buffers: ISP video buffers
+ * @lock: Mutex to protect access to the buffers, main queue and state
+ * @irqlock: Spinlock to protect access to the IRQ queue
+ * @streaming: Queue state, indicates whether the queue is streaming
+ * @queue: List of all queued buffers
+ */
+struct isp_video_queue {
+ enum v4l2_buf_type type;
+ const struct isp_video_queue_operations *ops;
+ struct device *dev;
+ unsigned int bufsize;
+
+ unsigned int count;
+ struct isp_video_buffer *buffers[ISP_VIDEO_MAX_BUFFERS];
+ struct mutex lock;
+ spinlock_t irqlock;
+
+ unsigned int streaming:1;
+
+ struct list_head queue;
+};
+
+int omap3isp_video_queue_cleanup(struct isp_video_queue *queue);
+int omap3isp_video_queue_init(struct isp_video_queue *queue,
+ enum v4l2_buf_type type,
+ const struct isp_video_queue_operations *ops,
+ struct device *dev, unsigned int bufsize);
+
+int omap3isp_video_queue_reqbufs(struct isp_video_queue *queue,
+ struct v4l2_requestbuffers *rb);
+int omap3isp_video_queue_querybuf(struct isp_video_queue *queue,
+ struct v4l2_buffer *vbuf);
+int omap3isp_video_queue_qbuf(struct isp_video_queue *queue,
+ struct v4l2_buffer *vbuf);
+int omap3isp_video_queue_dqbuf(struct isp_video_queue *queue,
+ struct v4l2_buffer *vbuf, int nonblocking);
+int omap3isp_video_queue_streamon(struct isp_video_queue *queue);
+void omap3isp_video_queue_streamoff(struct isp_video_queue *queue);
+void omap3isp_video_queue_discard_done(struct isp_video_queue *queue);
+int omap3isp_video_queue_mmap(struct isp_video_queue *queue,
+ struct vm_area_struct *vma);
+unsigned int omap3isp_video_queue_poll(struct isp_video_queue *queue,
+ struct file *file, poll_table *wait);
+
+#endif /* OMAP3_ISP_QUEUE_H */

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