#include <linux/slab.h>
#include <asm/uaccess.h>
#include <linux/videodev2.h>
+#include <media/videobuf2-v4l2.h>
#include <media/videobuf2-vmalloc.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-device.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-event.h>
struct buffer {
struct vb2_buffer vb;
static int update_frame(int xsz, int ysz);
+static int gen_frame(void);
module_init(init);
static int frame_size;
static int streaming;
-static struct buffer *buflist;
+static spinlock_t blist_lock;
+static struct buffer *buflist, *buflist_tail;
static int seqno;
}
mutex_init(&mutex);
+ spin_lock_init(&blist_lock);
vbops.queue_setup = queue_setup;
vbops.buf_prepare = buf_prepare;
if(!(vdev = video_device_alloc())) {
return -ENOMEM;
}
+ memset(vdev, 0, sizeof *vdev);
vdev->release = video_device_release;
strcpy(vdev->name, KBUILD_MODNAME);
vdev->fops = &fops;
vdev->ioctl_ops = &iops;
vdev->vfl_type = VFL_TYPE_GRABBER;
+ vdev->vfl_dir = VFL_DIR_RX;
vdev->v4l2_dev = &v4l2_dev;
+ vdev->lock = &mutex;
+ vdev->queue = &vbq;
fops.owner = THIS_MODULE;
fops.open = v4l2_fh_open;
iops.vidioc_expbuf = vb2_ioctl_expbuf;
iops.vidioc_streamon = vb2_ioctl_streamon;
iops.vidioc_streamoff = vb2_ioctl_streamoff;
+ iops.vidioc_log_status = v4l2_ctrl_log_status;
+ iops.vidioc_subscribe_event = v4l2_ctrl_subscribe_event;
+ iops.vidioc_unsubscribe_event = v4l2_event_unsubscribe;
if((res = video_register_device(vdev, VFL_TYPE_GRABBER, -1)) != 0) {
printk(KERN_ALERT "vdummy: failed to register video device\n");
static void buf_queue(struct vb2_buffer *vb)
{
- memcpy(vb2_plane_vaddr(vb, 0), frame, frame_size);
- vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
+ struct buffer *buf = (struct buffer*)((char*)vb - offsetof(struct buffer, vb));
+
+ spin_lock(&blist_lock);
+ if(buflist) {
+ buflist_tail->next = buf;
+ buflist_tail = buf;
+ } else {
+ buflist = buflist_tail = buf;
+ }
+ buf->next = 0;
+ spin_unlock(&blist_lock);
+}
+
+static void clear_queue(enum vb2_buffer_state st)
+{
+ spin_lock(&blist_lock);
+ while(buflist) {
+ struct buffer *buf = buflist;
+ buflist = buflist->next;
+ vb2_buffer_done(&buf->vb, st);
+ }
+ buflist = buflist_tail = 0;
+ spin_unlock(&blist_lock);
}
static int start_streaming(struct vb2_queue *vbq, unsigned int count)
{
streaming = 1;
seqno = 0;
+
+ gen_frame();
return 0;
}
static void stop_streaming(struct vb2_queue *vbq)
{
streaming = 0;
+ clear_queue(VB2_BUF_STATE_ERROR);
}
static int update_frame(int xsz, int ysz)
*tmp++ = (val << 2) & 0xff;
}
}
+
+ return 0;
+}
+
+static int gen_frame(void)
+{
+ struct buffer *buf = 0;
+
+ spin_lock(&blist_lock);
+ if(buflist) {
+ buf = buflist;
+ buflist = buflist->next;
+ if(!buflist) buflist_tail = 0;
+ }
+ spin_unlock(&blist_lock);
+
+ if(buf) {
+ memcpy(vb2_plane_vaddr(&buf->vb, 0), frame, frame_size);
+
+ /*v4l2_get_timestamp(&buf->vb.v4l2_buf.timestamp);
+ buf->vb.v4l2_buf.sequence = seqno++;
+ buf->vb.v4l2_buf.field = V4L2_FIELD_NONE;*/
+ vb2_buffer_done(&buf->vb, VB2_BUF_STATE_DONE);
+ }
+
return 0;
}