summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
-rw-r--r--drivers/media/video/videodev.c98
-rw-r--r--include/media/v4l2-dev.h4
2 files changed, 100 insertions, 2 deletions
diff --git a/drivers/media/video/videodev.c b/drivers/media/video/videodev.c
index 6cf6ad7193d9..9c539eb33811 100644
--- a/drivers/media/video/videodev.c
+++ b/drivers/media/video/videodev.c
@@ -372,6 +372,14 @@ EXPORT_SYMBOL(v4l_printk_ioctl);
* sysfs stuff
*/
+static ssize_t show_index(struct device *cd,
+ struct device_attribute *attr, char *buf)
+{
+ struct video_device *vfd = container_of(cd, struct video_device,
+ class_dev);
+ return sprintf(buf, "%i\n", vfd->index);
+}
+
static ssize_t show_name(struct device *cd,
struct device_attribute *attr, char *buf)
{
@@ -410,6 +418,7 @@ static void video_release(struct device *cd)
static struct device_attribute video_device_attrs[] = {
__ATTR(name, S_IRUGO, show_name, NULL),
+ __ATTR(index, S_IRUGO, show_index, NULL),
__ATTR_NULL
};
@@ -1900,8 +1909,82 @@ out:
}
EXPORT_SYMBOL(video_ioctl2);
+struct index_info {
+ struct device *dev;
+ unsigned int used[VIDEO_NUM_DEVICES];
+};
+
+static int __fill_index_info(struct device *cd, void *data)
+{
+ struct index_info *info = data;
+ struct video_device *vfd = container_of(cd, struct video_device,
+ class_dev);
+
+ if (info->dev == vfd->dev)
+ info->used[vfd->index] = 1;
+
+ return 0;
+}
+
+/**
+ * assign_index - assign stream number based on parent device
+ * @vdev: video_device to assign index number to, vdev->dev should be assigned
+ * @num: -1 if auto assign, requested number otherwise
+ *
+ *
+ * returns -ENFILE if num is already in use, a free index number if
+ * successful.
+ */
+static int get_index(struct video_device *vdev, int num)
+{
+ struct index_info *info;
+ int i;
+ int ret = 0;
+
+ if (num >= VIDEO_NUM_DEVICES)
+ return -EINVAL;
+
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ info->dev = vdev->dev;
+
+ ret = class_for_each_device(&video_class, info,
+ __fill_index_info);
+
+ if (ret < 0)
+ goto out;
+
+ if (num >= 0) {
+ if (!info->used[num])
+ ret = num;
+ else
+ ret = -ENFILE;
+
+ goto out;
+ }
+
+ for (i = 0; i < VIDEO_NUM_DEVICES; i++) {
+ if (info->used[i])
+ continue;
+ ret = i;
+ goto out;
+ }
+
+out:
+ kfree(info);
+ return ret;
+}
+
static const struct file_operations video_fops;
+int video_register_device(struct video_device *vfd, int type, int nr)
+{
+ return video_register_device_index(vfd, type, nr, -1);
+}
+EXPORT_SYMBOL(video_register_device);
+
/**
* video_register_device - register video4linux devices
* @vfd: video device structure we want to register
@@ -1927,7 +2010,8 @@ static const struct file_operations video_fops;
* %VFL_TYPE_RADIO - A radio card
*/
-int video_register_device(struct video_device *vfd, int type, int nr)
+int video_register_device_index(struct video_device *vfd, int type, int nr,
+ int index)
{
int i=0;
int base;
@@ -1984,6 +2068,16 @@ int video_register_device(struct video_device *vfd, int type, int nr)
}
video_device[i]=vfd;
vfd->minor=i;
+
+ ret = get_index(vfd, index);
+ if (ret < 0) {
+ printk(KERN_ERR "%s: get_index failed\n",
+ __func__);
+ goto fail_minor;
+ }
+
+ vfd->index = ret;
+
mutex_unlock(&videodev_lock);
mutex_init(&vfd->lock);
@@ -2017,7 +2111,7 @@ fail_minor:
mutex_unlock(&videodev_lock);
return ret;
}
-EXPORT_SYMBOL(video_register_device);
+EXPORT_SYMBOL(video_register_device_index);
/**
* video_unregister_device - unregister a video4linux device
diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h
index 40b0810a595a..9e6e4f18e948 100644
--- a/include/media/v4l2-dev.h
+++ b/include/media/v4l2-dev.h
@@ -96,6 +96,8 @@ struct video_device
int type; /* v4l1 */
int type2; /* v4l2 */
int minor;
+ /* attribute to diferentiate multiple indexs on one physical device */
+ int index;
int debug; /* Activates debug level*/
@@ -347,6 +349,8 @@ void *priv;
/* Version 2 functions */
extern int video_register_device(struct video_device *vfd, int type, int nr);
+int video_register_device_index(struct video_device *vfd, int type, int nr,
+ int index);
void video_unregister_device(struct video_device *);
extern int video_ioctl2(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg);