[Nouveau] [PATCH i-g-t v5 3/5] lib/igt_debugfs: Add igt_debugfs_pipe_dir()

[Lyude]

From: Lyude Paul <lyude at redhat.com>

Like igt_debugfs_connector_dir(), but for pipes instead.

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

Signed-off-by: Lyude Paul <lyude at redhat.com>
---
 lib/igt_debugfs.c | 21 +++++++++++++++++++++
 lib/igt_debugfs.h |  1 +
 2 files changed, 22 insertions(+)

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
@@ -260,6 +260,27 @@ int igt_debugfs_connector_dir(int device, char *conn_name, int mode)
 	return ret;
 }
 
+/**
+ * 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
diff --git a/lib/igt_debugfs.h b/lib/igt_debugfs.h
index 722c5cc3..d43ba6c6 100644
--- a/lib/igt_debugfs.h
+++ b/lib/igt_debugfs.h
@@ -36,6 +36,7 @@ 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_pipe_dir(int device, int pipe, 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);
-- 
2.26.2