Add a new v4l2 API to enumerate camera devs.

To inform early camera module when camera devs are detected,
v4l2_enumerate_camera is implemented. For details, please
check the wiki page:
https://wiki.tizen.org/wiki/Early_Camera

Change-Id: I3cdf6a54ae179c366e22c7e7a6b51f03c0c10efd
Signed-off-by: Fang, Neo <neo.fang@intel.com>

diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c
index 0f11f70..c69ba3f 100644 (file)
--- a/drivers/media/v4l2-core/v4l2-dev.c
+++ b/drivers/media/v4l2-core/v4l2-dev.c
@@ -434,6 +434,48 @@ static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm)
        return ret;
 }
 
+int v4l2_enumerate_camera(unsigned int *camera_minor_lst,
+                         int *camera_id_lst,
+                         int *cnt)
+{
+       int i = 0;
+       struct video_device *dev = NULL;
+       int count = 0;
+
+       if (NULL == cnt || NULL == camera_minor_lst || NULL == camera_id_lst) {
+               pr_debug("Invalid parameter\n");
+               return -EINVAL;
+       }
+       if (0 >= *cnt) {
+               pr_debug("Invalid parameter\n");
+               return -EINVAL;
+       }
+
+       wait_for_completion_timeout(&video_device_completion,
+                                   msecs_to_jiffies(5000));
+       for (i = 0; i < VIDEO_NUM_DEVICES; ) {
+               dev = video_device[i];
+               if (NULL != dev) {
+                       if (dev->vfl_type == VFL_TYPE_GRABBER) {
+                               camera_minor_lst[count] = dev->minor;
+                               camera_id_lst[count] = dev->num;
+                               count++;
+                               if (count == *cnt)
+                                       break;
+                       }
+               }
+               i++;
+       }
+       *cnt = count;
+       if (0 == count) {
+               pr_debug("Find no video dev.\n");
+               return -ENODEV;
+       }
+
+       return 0;
+}
+EXPORT_SYMBOL(v4l2_enumerate_camera);
+
 /* Override for the open function */
 static int v4l2_open(struct inode *inode, struct file *filp)
 {