[media] saa7146: support control events and priority handling

Use v4l2_fh which gives you control events and priority handling for free.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

3 files changed, 19 insertions, 6 deletions

diff --git a/drivers/media/common/saa7146_fops.c b/drivers/media/common/saa7146_fops.c
index 66f6e79dd97b..dfb396568ab6 100644
--- a/drivers/media/common/saa7146_fops.c
+++ b/drivers/media/common/saa7146_fops.c
@@ -198,7 +198,6 @@ static int fops_open(struct file *file)
         struct saa7146_dev *dev = video_drvdata(file);
         struct saa7146_fh *fh = NULL;
         int result = 0;
-
         enum v4l2_buf_type type;
 
         DEB_EE("file:%p, dev:%s\n", file, video_device_node_name(vdev));
@@ -227,7 +226,9 @@ static int fops_open(struct file *file)
                 goto out;
         }
 
-        file->private_data = fh;
+        v4l2_fh_init(&fh->fh, vdev);
+
+        file->private_data = &fh->fh;
         fh->dev = dev;
 
         if (vdev->vfl_type == VFL_TYPE_VBI) {
@@ -251,6 +252,7 @@ static int fops_open(struct file *file)
         }
 
         result = 0;
+        v4l2_fh_add(&fh->fh);
 out:
         if (fh && result != 0) {
                 kfree(fh);
@@ -280,6 +282,8 @@ static int fops_release(struct file *file)
                 saa7146_video_uops.release(dev,file);
         }
 
+        v4l2_fh_del(&fh->fh);
+        v4l2_fh_exit(&fh->fh);
         module_put(dev->ext->module);
         file->private_data = NULL;
         kfree(fh);
@@ -322,12 +326,13 @@ static unsigned int fops_poll(struct file *file, struct poll_table_struct *wait)
         struct saa7146_fh *fh = file->private_data;
         struct videobuf_buffer *buf = NULL;
         struct videobuf_queue *q;
+        unsigned int res = v4l2_ctrl_poll(file, wait);
 
         DEB_EE("file:%p, poll:%p\n", file, wait);
 
         if (vdev->vfl_type == VFL_TYPE_VBI) {
                 if( 0 == fh->vbi_q.streaming )
-                        return videobuf_poll_stream(file, &fh->vbi_q, wait);
+                        return res | videobuf_poll_stream(file, &fh->vbi_q, wait);
                 q = &fh->vbi_q;
         } else {
                 DEB_D("using video queue\n");
@@ -339,17 +344,17 @@ static unsigned int fops_poll(struct file *file, struct poll_table_struct *wait)
 
         if (!buf) {
                 DEB_D("buf == NULL!\n");
-                return POLLERR;
+                return res | POLLERR;
         }
 
         poll_wait(file, &buf->done, wait);
         if (buf->state == VIDEOBUF_DONE || buf->state == VIDEOBUF_ERROR) {
                 DEB_D("poll succeeded!\n");
-                return POLLIN|POLLRDNORM;
+                return res | POLLIN | POLLRDNORM;
         }
 
         DEB_D("nothing to poll for, buf->state:%d\n", buf->state);
-        return 0;
+        return res;
 }
 
 static ssize_t fops_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
@@ -583,6 +588,7 @@ int saa7146_register_device(struct video_device **vid, struct saa7146_dev* dev,
         vfd->lock = &dev->v4l2_lock;
         vfd->v4l2_dev = &dev->v4l2_dev;
         vfd->tvnorms = 0;
+        set_bit(V4L2_FL_USE_FH_PRIO, &vfd->flags);
         for (i = 0; i < dev->ext_vv_data->num_stds; i++)
                 vfd->tvnorms |= dev->ext_vv_data->stds[i].id;
         strlcpy(vfd->name, name, sizeof(vfd->name));
diff --git a/drivers/media/common/saa7146_video.c b/drivers/media/common/saa7146_video.c
index 850799051bef..4ca9a2561513 100644
--- a/drivers/media/common/saa7146_video.c
+++ b/drivers/media/common/saa7146_video.c
@@ -2,6 +2,8 @@
 
 #include <media/saa7146_vv.h>
 #include <media/v4l2-chip-ident.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-ctrls.h>
 #include <linux/module.h>
 
 static int max_memory = 32;
@@ -1021,6 +1023,8 @@ const struct v4l2_ioctl_ops saa7146_video_ioctl_ops = {
         .vidioc_streamon             = vidioc_streamon,
         .vidioc_streamoff            = vidioc_streamoff,
         .vidioc_g_parm               = vidioc_g_parm,
+        .vidioc_subscribe_event      = v4l2_ctrl_subscribe_event,
+        .vidioc_unsubscribe_event    = v4l2_event_unsubscribe,
 };
 
 /*********************************************************************************/
diff --git a/include/media/saa7146_vv.h b/include/media/saa7146_vv.h
index 2cc32c514173..2bbdf3046be6 100644
--- a/include/media/saa7146_vv.h
+++ b/include/media/saa7146_vv.h
@@ -3,6 +3,7 @@
 
 #include <media/v4l2-common.h>
 #include <media/v4l2-ioctl.h>
+#include <media/v4l2-fh.h>
 #include <media/saa7146.h>
 #include <media/videobuf-dma-sg.h>
 
@@ -84,6 +85,8 @@ struct saa7146_overlay {
 
 /* per open data */
 struct saa7146_fh {
+        /* Must be the first field! */
+        struct v4l2_fh          fh;
         struct saa7146_dev      *dev;
 
         /* video capture */