lib/igt_debugfs: Add igt_debugfs_pipe_dir()

Like igt_debugfs_connector_dir(), but for pipes instead.

Changes since v4:
* Make igt_debugfs_pipe_dir() much smaller - jcline
* Fixup docs - jcline

Reviewed-by: Jeremy Cline <jcline@redhat.com>
Signed-off-by: Lyude Paul <lyude@redhat.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/lib/igt_debugfs.c b/lib/igt_debugfs.c
index 05067078..c4dab392 100644
--- a/lib/igt_debugfs.c
+++ b/lib/igt_debugfs.c
@@ -261,6 +261,27 @@ int igt_debugfs_connector_dir(int device, char *conn_name, int mode)
 }
 
 /**
+ * igt_debugfs_pipe_dir:
+ * @device: fd of the device
+ * @pipe: index of pipe
+ * @mode: mode bits as used by open()
+ *
+ * This opens the debugfs directory corresponding to the pipe index on the
+ * device for use with igt_sysfs_get() and related functions. This is just
+ * syntax sugar for igt_debugfs_open().
+ *
+ * Returns:
+ * The directory fd, or -1 on failure.
+ */
+int igt_debugfs_pipe_dir(int device, int pipe, int mode)
+{
+	char buf[128];
+
+	snprintf(buf, sizeof(buf), "crtc-%d", pipe);
+	return igt_debugfs_open(device, buf, mode);
+}
+
+/**
  * igt_debugfs_open:
  * @filename: name of the debugfs node to open
  * @mode: mode bits as used by open()