[Intel-gfx] [PATCH i-g-t 1/3] lib: Add helper for reading modparam values

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

Add __igt_params_get for simple reading of modparams.

v2:
 * Fix kerneldoc. (Matt)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Reviewed-by: Matthew Auld <matthew.auld at intel.com>
---
 lib/igt_params.c | 26 ++++++++++++++++++++++++++
 lib/igt_params.h |  2 ++
 2 files changed, 28 insertions(+)

diff --git a/lib/igt_params.c b/lib/igt_params.c
index c06416988baa..3dad317a56b2 100644
--- a/lib/igt_params.c
+++ b/lib/igt_params.c
@@ -156,6 +156,32 @@ int igt_params_open(int device)
 	return params;
 }
 
+/**
+ * __igt_params_get:
+ * @device: fd of the device
+ * @parameter: the name of the parameter to get
+ *
+ * This reads the value of the modparam.
+ *
+ * Returns:
+ * A nul-terminated string, must be freed by caller after use, or NULL
+ * on failure.
+ */
+char *__igt_params_get(int device, const char *parameter)
+{
+	char *str;
+	int dir;
+
+	dir = igt_params_open(device);
+	if (dir < 0)
+		return NULL;
+
+	str = igt_sysfs_get(dir, parameter);
+	close(dir);
+
+	return str;
+}
+
 __attribute__((format(printf, 3, 0)))
 static bool __igt_params_set(int device, const char *parameter,
 			     const char *fmt, va_list ap, bool save)
diff --git a/lib/igt_params.h b/lib/igt_params.h
index bbd6f3ee6582..6494786f0696 100644
--- a/lib/igt_params.h
+++ b/lib/igt_params.h
@@ -28,6 +28,8 @@
 
 int igt_params_open(int device);
 
+char *__igt_params_get(int device, const char *parameter);
+
 __attribute__((format(printf, 3, 4)))
 bool igt_params_set(int device, const char *parameter, const char *fmt, ...);
 
-- 
2.27.0