Merge "init: uevent: Add msm video symbolic link handling" into cm-10.2

init/devices.c

@@ -358,6 +358,41 @@ static void parse_event(const char *msg, struct uevent *uevent)
                     uevent->firmware, uevent->major, uevent->minor);
 }
 
+static char **get_v4l_device_symlinks(struct uevent *uevent)
+{
+    char **links;
+    int fd = -1;
+    int nr;
+    char link_name_path[256];
+    char link_name[64];
+
+    if (strncmp(uevent->path, "/devices/virtual/video4linux/video", 34))
+        return NULL;
+
+    links = malloc(sizeof(char *) * 2);
+    if (!links)
+        return NULL;
+    memset(links, 0, sizeof(char *) * 2);
+
+    snprintf(link_name_path, sizeof(link_name_path), "%s%s%s",
+            SYSFS_PREFIX, uevent->path, "/link_name");
+    fd = open(link_name_path, O_RDONLY);
+    if (fd < 0)
+        goto err;
+    nr = read(fd, link_name, sizeof(link_name) - 1);
+    close(fd);
+    if (nr <= 0)
+        goto err;
+    link_name[nr] = '\0';
+    if (asprintf(&links[0], "/dev/video/%s", link_name) <= 0)
+        links[0] = NULL;
+
+    return links;
+err:
+    free(links);
+    return NULL;
+}
+
 static char **get_character_device_symlinks(struct uevent *uevent)
 {
     const char *parent;
@@ -628,6 +663,8 @@ static void handle_generic_device_event(struct uevent *uevent)
      } else
          base = "/dev/";
      links = get_character_device_symlinks(uevent);
+     if (!links)
+         links = get_v4l_device_symlinks(uevent);
 
      if (!devpath[0])
          snprintf(devpath, sizeof(devpath), "%s%s", base, name);