[igt-dev] [PATCH i-g-t v5 1/2] lib/debugfs: function to open connector debugfs dir

[Ramalingam C]

Function to open a debugfs directory of a connector associated to
a device.

v2:
  instead of string manipulation openat used [Chris]

Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
 lib/igt_debugfs.c | 27 +++++++++++++++++++++++++++
 lib/igt_debugfs.h |  1 +
 2 files changed, 28 insertions(+)

diff --git a/lib/igt_debugfs.c b/lib/igt_debugfs.c
index baedc2255ac9..181e2cfc114f 100644
--- a/lib/igt_debugfs.c
+++ b/lib/igt_debugfs.c
@@ -237,6 +237,33 @@ int igt_debugfs_dir(int device)
 }
 
 /**
+ * igt_debugfs_connector_dir:
+ * @device: fd of the device
+ * @conn_name: conenctor name
+ * @mode: mode bits as used by open()
+ *
+ * This opens the debugfs directory corresponding to connector on the device
+ * for use with igt_sysfs_get() and related functions.
+ *
+ * Returns:
+ * The directory fd, or -1 on failure.
+ */
+int igt_debugfs_connector_dir(int device, char *conn_name, int mode)
+{
+	int dir, ret;
+
+	dir = igt_debugfs_dir(device);
+	if (dir < 0)
+		return dir;
+
+	ret = openat(dir, conn_name, mode);
+
+	close(dir);
+
+	return ret;
+}
+
+/**
  * igt_debugfs_open:
  * @filename: name of the debugfs node to open
  * @mode: mode bits as used by open()
diff --git a/lib/igt_debugfs.h b/lib/igt_debugfs.h
index ff8612dc66c2..8349ce948d49 100644
--- a/lib/igt_debugfs.h
+++ b/lib/igt_debugfs.h
@@ -35,6 +35,7 @@ const char *igt_debugfs_mount(void);
 char *igt_debugfs_path(int device, char *path, int pathlen);
 
 int igt_debugfs_dir(int device);
+int igt_debugfs_connector_dir(int device, char *conn_name, int mode);
 
 int igt_debugfs_open(int fd, const char *filename, int mode);
 void __igt_debugfs_read(int fd, const char *filename, char *buf, int size);
-- 
2.7.4