lib: Add simple sysfs accessors

igt_sysfs_set() for setting an attribute via sysfs, igt_sysfs_get() for
reading.

v2: Lots of little bugs in igt_sysfs_get()
v3: Pass device to open, stop assuming Intel rules.
v4: Test opening and reading!

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 34 insertions, 0 deletions

diff --git a/lib/igt_sysfs.h b/lib/igt_sysfs.h
new file mode 100644
index 00000000..5c49f64f
--- /dev/null
+++ b/lib/igt_sysfs.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright © 2016 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#ifndef __IGT_SYSFS_H__
+#define __IGT_SYSFS_H__
+
+#include <stdbool.h>
+
+int igt_sysfs_open(int device, int *idx);
+bool igt_sysfs_set(int dir, const char *attr, const char *value);
+char *igt_sysfs_get(int dir, const char *attr);
+
+#endif /* __IGT_SYSFS_H__ */