lib/params: add igt_params_open() which will return path

Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Reviewed-by: Petri Latvala <petri.latvala@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

1 files changed, 18 insertions, 11 deletions

diff --git a/lib/igt_params.c b/lib/igt_params.c
index b5ac1266..fe4b1df3 100644
--- a/lib/igt_params.c
+++ b/lib/igt_params.c
@@ -107,17 +107,7 @@ static void igt_params_save(int dir, const char *path, const char *name)
 	module_params = data;
 }
 
-/**
- * igt_params_open:
- * @device: fd of the device
- *
- * This opens the module parameters directory (under sysfs) corresponding
- * to the device for use with igt_sysfs_set() and igt_sysfs_get().
- *
- * Returns:
- * The directory fd, or -1 on failure.
- */
-int igt_params_open(int device)
+static int __igt_params_open(int device, char **outpath)
 {
 	int dir, params = -1;
 
@@ -141,12 +131,29 @@ int igt_params_open(int device)
 
 		sprintf(path, "/sys/module/%s/parameters", name);
 		params = open(path, O_RDONLY);
+		if (params >= 0 && outpath)
+			*outpath = strdup(path);
 	}
 
 	return params;
 }
 
 /**
+ * igt_params_open:
+ * @device: fd of the device
+ *
+ * This opens the module parameters directory (under sysfs) corresponding
+ * to the device for use with igt_sysfs_set() and igt_sysfs_get().
+ *
+ * Returns:
+ * The directory fd, or -1 on failure.
+ */
+int igt_params_open(int device)
+{
+	return __igt_params_open(device, NULL);
+}
+
+/**
  * igt_params_set:
  * @device: fd of the device
  * @parameter: the name of the parameter to set