1 files changed, 477 insertions, 0 deletions

diff --git a/drivers/media/video/uvc/uvc_queue.c b/drivers/media/video/uvc/uvc_queue.c
new file mode 100644
index 00000000000..0923f0e3b3d
--- /dev/null
+++ b/drivers/media/video/uvc/uvc_queue.c
@@ -0,0 +1,477 @@
+/*
+ *      uvc_queue.c  --  USB Video Class driver - Buffers management
+ *
+ *      Copyright (C) 2005-2008
+ *          Laurent Pinchart (laurent.pinchart@skynet.be)
+ *
+ *      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.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/version.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/videodev2.h>
+#include <linux/vmalloc.h>
+#include <linux/wait.h>
+#include <asm/atomic.h>
+
+#include "uvcvideo.h"
+
+/* ------------------------------------------------------------------------
+ * Video buffers queue management.
+ *
+ * Video queues is initialized by uvc_queue_init(). The function performs
+ * basic initialization of the uvc_video_queue struct and never fails.
+ *
+ * Video buffer allocation and freeing are performed by uvc_alloc_buffers and
+ * uvc_free_buffers respectively. The former acquires the video queue lock,
+ * while the later must be called with the lock held (so that allocation can
+ * free previously allocated buffers). Trying to free buffers that are mapped
+ * to user space will return -EBUSY.
+ *
+ * Video buffers are managed using two queues. However, unlike most USB video
+ * drivers which use an in queue and an out queue, we use a main queue which
+ * holds all queued buffers (both 'empty' and 'done' buffers), and an irq
+ * queue which holds empty buffers. This design (copied from video-buf)
+ * minimizes locking in interrupt, as only one queue is shared between
+ * interrupt and user contexts.
+ *
+ * Use cases
+ * ---------
+ *
+ * Unless stated otherwise, all operations which modify the irq buffers queue
+ * are protected by the irq spinlock.
+ *
+ * 1. The user queues the buffers, starts streaming and dequeues a buffer.
+ *
+ *    The buffers are added to the main and irq queues. Both operations are
+ *    protected by the queue lock, and the latert is protected by the irq
+ *    spinlock as well.
+ *
+ *    The completion handler fetches a buffer from the irq queue and fills it
+ *    with video data. If no buffer is available (irq queue empty), the handler
+ *    returns immediately.
+ *
+ *    When the buffer is full, the completion handler removes it from the irq
+ *    queue, marks it as ready (UVC_BUF_STATE_DONE) and wake its wait queue.
+ *    At that point, any process waiting on the buffer will be woken up. If a
+ *    process tries to dequeue a buffer after it has been marked ready, the
+ *    dequeing will succeed immediately.
+ *
+ * 2. Buffers are queued, user is waiting on a buffer and the device gets
+ *    disconnected.
+ *
+ *    When the device is disconnected, the kernel calls the completion handler
+ *    with an appropriate status code. The handler marks all buffers in the
+ *    irq queue as being erroneous (UVC_BUF_STATE_ERROR) and wakes them up so
+ *    that any process waiting on a buffer gets woken up.
+ *
+ *    Waking up up the first buffer on the irq list is not enough, as the
+ *    process waiting on the buffer might restart the dequeue operation
+ *    immediately.
+ *
+ */
+
+void uvc_queue_init(struct uvc_video_queue *queue)
+{
+        mutex_init(&queue->mutex);
+        spin_lock_init(&queue->irqlock);
+        INIT_LIST_HEAD(&queue->mainqueue);
+        INIT_LIST_HEAD(&queue->irqqueue);
+}
+
+/*
+ * Allocate the video buffers.
+ *
+ * Pages are reserved to make sure they will not be swaped, as they will be
+ * filled in URB completion handler.
+ *
+ * Buffers will be individually mapped, so they must all be page aligned.
+ */
+int uvc_alloc_buffers(struct uvc_video_queue *queue, unsigned int nbuffers,
+                unsigned int buflength)
+{
+        unsigned int bufsize = PAGE_ALIGN(buflength);
+        unsigned int i;
+        void *mem = NULL;
+        int ret;
+
+        if (nbuffers > UVC_MAX_VIDEO_BUFFERS)
+                nbuffers = UVC_MAX_VIDEO_BUFFERS;
+
+        mutex_lock(&queue->mutex);
+
+        if ((ret = uvc_free_buffers(queue)) < 0)
+                goto done;
+
+        /* Bail out if no buffers should be allocated. */
+        if (nbuffers == 0)
+                goto done;
+
+        /* Decrement the number of buffers until allocation succeeds. */
+        for (; nbuffers > 0; --nbuffers) {
+                mem = vmalloc_32(nbuffers * bufsize);
+                if (mem != NULL)
+                        break;
+        }
+
+        if (mem == NULL) {
+                ret = -ENOMEM;
+                goto done;
+        }
+
+        for (i = 0; i < nbuffers; ++i) {
+                memset(&queue->buffer[i], 0, sizeof queue->buffer[i]);
+                queue->buffer[i].buf.index = i;
+                queue->buffer[i].buf.m.offset = i * bufsize;
+                queue->buffer[i].buf.length = buflength;
+                queue->buffer[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+                queue->buffer[i].buf.sequence = 0;
+                queue->buffer[i].buf.field = V4L2_FIELD_NONE;
+                queue->buffer[i].buf.memory = V4L2_MEMORY_MMAP;
+                queue->buffer[i].buf.flags = 0;
+                init_waitqueue_head(&queue->buffer[i].wait);
+        }
+
+        queue->mem = mem;
+        queue->count = nbuffers;
+        queue->buf_size = bufsize;
+        ret = nbuffers;
+
+done:
+        mutex_unlock(&queue->mutex);
+        return ret;
+}
+
+/*
+ * Free the video buffers.
+ *
+ * This function must be called with the queue lock held.
+ */
+int uvc_free_buffers(struct uvc_video_queue *queue)
+{
+        unsigned int i;
+
+        for (i = 0; i < queue->count; ++i) {
+                if (queue->buffer[i].vma_use_count != 0)
+                        return -EBUSY;
+        }
+
+        if (queue->count) {
+                vfree(queue->mem);
+                queue->count = 0;
+        }
+
+        return 0;
+}
+
+static void __uvc_query_buffer(struct uvc_buffer *buf,
+                struct v4l2_buffer *v4l2_buf)
+{
+        memcpy(v4l2_buf, &buf->buf, sizeof *v4l2_buf);
+
+        if (buf->vma_use_count)
+                v4l2_buf->flags |= V4L2_BUF_FLAG_MAPPED;
+
+        switch (buf->state) {
+        case UVC_BUF_STATE_ERROR:
+        case UVC_BUF_STATE_DONE:
+                v4l2_buf->flags |= V4L2_BUF_FLAG_DONE;
+                break;
+        case UVC_BUF_STATE_QUEUED:
+        case UVC_BUF_STATE_ACTIVE:
+                v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
+                break;
+        case UVC_BUF_STATE_IDLE:
+        default:
+                break;
+        }
+}
+
+int uvc_query_buffer(struct uvc_video_queue *queue,
+                struct v4l2_buffer *v4l2_buf)
+{
+        int ret = 0;
+
+        mutex_lock(&queue->mutex);
+        if (v4l2_buf->index >= queue->count) {
+                ret = -EINVAL;
+                goto done;
+        }
+
+        __uvc_query_buffer(&queue->buffer[v4l2_buf->index], v4l2_buf);
+
+done:
+       mutex_unlock(&queue->mutex);
+       return ret;
+}
+
+/*
+ * Queue a video buffer. Attempting to queue a buffer that has already been
+ * queued will return -EINVAL.
+ */
+int uvc_queue_buffer(struct uvc_video_queue *queue,
+        struct v4l2_buffer *v4l2_buf)
+{
+        struct uvc_buffer *buf;
+        unsigned long flags;
+        int ret = 0;
+
+        uvc_trace(UVC_TRACE_CAPTURE, "Queuing buffer %u.\n", v4l2_buf->index);
+
+        if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+            v4l2_buf->memory != V4L2_MEMORY_MMAP) {
+                uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer type (%u) "
+                        "and/or memory (%u).\n", v4l2_buf->type,
+                        v4l2_buf->memory);
+                return -EINVAL;
+        }
+
+        mutex_lock(&queue->mutex);
+        if (v4l2_buf->index >= queue->count)  {
+                uvc_trace(UVC_TRACE_CAPTURE, "[E] Out of range index.\n");
+                ret = -EINVAL;
+                goto done;
+        }
+
+        buf = &queue->buffer[v4l2_buf->index];
+        if (buf->state != UVC_BUF_STATE_IDLE) {
+                uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer state "
+                        "(%u).\n", buf->state);
+                ret = -EINVAL;
+                goto done;
+        }
+
+        spin_lock_irqsave(&queue->irqlock, flags);
+        if (queue->flags & UVC_QUEUE_DISCONNECTED) {
+                spin_unlock_irqrestore(&queue->irqlock, flags);
+                ret = -ENODEV;
+                goto done;
+        }
+        buf->state = UVC_BUF_STATE_QUEUED;
+        buf->buf.bytesused = 0;
+        list_add_tail(&buf->stream, &queue->mainqueue);
+        list_add_tail(&buf->queue, &queue->irqqueue);
+        spin_unlock_irqrestore(&queue->irqlock, flags);
+
+done:
+        mutex_unlock(&queue->mutex);
+        return ret;
+}
+
+static int uvc_queue_waiton(struct uvc_buffer *buf, int nonblocking)
+{
+        if (nonblocking) {
+                return (buf->state != UVC_BUF_STATE_QUEUED &&
+                        buf->state != UVC_BUF_STATE_ACTIVE)
+                        ? 0 : -EAGAIN;
+        }
+
+        return wait_event_interruptible(buf->wait,
+                buf->state != UVC_BUF_STATE_QUEUED &&
+                buf->state != UVC_BUF_STATE_ACTIVE);
+}
+
+/*
+ * Dequeue a video buffer. If nonblocking is false, block until a buffer is
+ * available.
+ */
+int uvc_dequeue_buffer(struct uvc_video_queue *queue,
+                struct v4l2_buffer *v4l2_buf, int nonblocking)
+{
+        struct uvc_buffer *buf;
+        int ret = 0;
+
+        if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+            v4l2_buf->memory != V4L2_MEMORY_MMAP) {
+                uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer type (%u) "
+                        "and/or memory (%u).\n", v4l2_buf->type,
+                        v4l2_buf->memory);
+                return -EINVAL;
+        }
+
+        mutex_lock(&queue->mutex);
+        if (list_empty(&queue->mainqueue)) {
+                uvc_trace(UVC_TRACE_CAPTURE, "[E] Empty buffer queue.\n");
+                ret = -EINVAL;
+                goto done;
+        }
+
+        buf = list_first_entry(&queue->mainqueue, struct uvc_buffer, stream);
+        if ((ret = uvc_queue_waiton(buf, nonblocking)) < 0)
+                goto done;
+
+        uvc_trace(UVC_TRACE_CAPTURE, "Dequeuing buffer %u (%u, %u bytes).\n",
+                buf->buf.index, buf->state, buf->buf.bytesused);
+
+        switch (buf->state) {
+        case UVC_BUF_STATE_ERROR:
+                uvc_trace(UVC_TRACE_CAPTURE, "[W] Corrupted data "
+                        "(transmission error).\n");
+                ret = -EIO;
+        case UVC_BUF_STATE_DONE:
+                buf->state = UVC_BUF_STATE_IDLE;
+                break;
+
+        case UVC_BUF_STATE_IDLE:
+        case UVC_BUF_STATE_QUEUED:
+        case UVC_BUF_STATE_ACTIVE:
+        default:
+                uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer state %u "
+                        "(driver bug?).\n", buf->state);
+                ret = -EINVAL;
+                goto done;
+        }
+
+        list_del(&buf->stream);
+        __uvc_query_buffer(buf, v4l2_buf);
+
+done:
+        mutex_unlock(&queue->mutex);
+        return ret;
+}
+
+/*
+ * Poll the video queue.
+ *
+ * This function implements video queue polling and is intended to be used by
+ * the device poll handler.
+ */
+unsigned int uvc_queue_poll(struct uvc_video_queue *queue, struct file *file,
+                poll_table *wait)
+{
+        struct uvc_buffer *buf;
+        unsigned int mask = 0;
+
+        mutex_lock(&queue->mutex);
+        if (list_empty(&queue->mainqueue)) {
+                mask |= POLLERR;
+                goto done;
+        }
+        buf = list_first_entry(&queue->mainqueue, struct uvc_buffer, stream);
+
+        poll_wait(file, &buf->wait, wait);
+        if (buf->state == UVC_BUF_STATE_DONE ||
+            buf->state == UVC_BUF_STATE_ERROR)
+                mask |= POLLIN | POLLRDNORM;
+
+done:
+        mutex_unlock(&queue->mutex);
+        return mask;
+}
+
+/*
+ * Enable or disable the video buffers queue.
+ *
+ * The queue must be enabled before starting video acquisition and must be
+ * disabled after stopping it. This ensures that the video buffers queue
+ * state can be properly initialized before buffers are accessed from the
+ * interrupt handler.
+ *
+ * Enabling the video queue initializes parameters (such as sequence number,
+ * sync pattern, ...). If the queue is already enabled, return -EBUSY.
+ *
+ * Disabling the video queue cancels the queue and removes all buffers from
+ * the main queue.
+ *
+ * This function can't be called from interrupt context. Use
+ * uvc_queue_cancel() instead.
+ */
+int uvc_queue_enable(struct uvc_video_queue *queue, int enable)
+{
+        unsigned int i;
+        int ret = 0;
+
+        mutex_lock(&queue->mutex);
+        if (enable) {
+                if (uvc_queue_streaming(queue)) {
+                        ret = -EBUSY;
+                        goto done;
+                }
+                queue->sequence = 0;
+                queue->flags |= UVC_QUEUE_STREAMING;
+        } else {
+                uvc_queue_cancel(queue, 0);
+                INIT_LIST_HEAD(&queue->mainqueue);
+
+                for (i = 0; i < queue->count; ++i)
+                        queue->buffer[i].state = UVC_BUF_STATE_IDLE;
+
+                queue->flags &= ~UVC_QUEUE_STREAMING;
+        }
+
+done:
+        mutex_unlock(&queue->mutex);
+        return ret;
+}
+
+/*
+ * Cancel the video buffers queue.
+ *
+ * Cancelling the queue marks all buffers on the irq queue as erroneous,
+ * wakes them up and remove them from the queue.
+ *
+ * If the disconnect parameter is set, further calls to uvc_queue_buffer will
+ * fail with -ENODEV.
+ *
+ * This function acquires the irq spinlock and can be called from interrupt
+ * context.
+ */
+void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect)
+{
+        struct uvc_buffer *buf;
+        unsigned long flags;
+
+        spin_lock_irqsave(&queue->irqlock, flags);
+        while (!list_empty(&queue->irqqueue)) {
+                buf = list_first_entry(&queue->irqqueue, struct uvc_buffer,
+                                       queue);
+                list_del(&buf->queue);
+                buf->state = UVC_BUF_STATE_ERROR;
+                wake_up(&buf->wait);
+        }
+        /* This must be protected by the irqlock spinlock to avoid race
+         * conditions between uvc_queue_buffer and the disconnection event that
+         * could result in an interruptible wait in uvc_dequeue_buffer. Do not
+         * blindly replace this logic by checking for the UVC_DEV_DISCONNECTED
+         * state outside the queue code.
+         */
+        if (disconnect)
+                queue->flags |= UVC_QUEUE_DISCONNECTED;
+        spin_unlock_irqrestore(&queue->irqlock, flags);
+}
+
+struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue,
+                struct uvc_buffer *buf)
+{
+        struct uvc_buffer *nextbuf;
+        unsigned long flags;
+
+        if ((queue->flags & UVC_QUEUE_DROP_INCOMPLETE) &&
+            buf->buf.length != buf->buf.bytesused) {
+                buf->state = UVC_BUF_STATE_QUEUED;
+                buf->buf.bytesused = 0;
+                return buf;
+        }
+
+        spin_lock_irqsave(&queue->irqlock, flags);
+        list_del(&buf->queue);
+        if (!list_empty(&queue->irqqueue))
+                nextbuf = list_first_entry(&queue->irqqueue, struct uvc_buffer,
+                                           queue);
+        else
+                nextbuf = NULL;
+        spin_unlock_irqrestore(&queue->irqlock, flags);
+
+        buf->buf.sequence = queue->sequence++;
+        do_gettimeofday(&buf->buf.timestamp);
+
+        wake_up(&buf->wait);
+        return nextbuf;
+}