[igt-dev] [RFC PATCH i-g-t] lib/sysfs: Add support for getting boolean module parameters

[Janusz Krzysztofik]

Boolean module parameters are exposed as "Y"/"N" strings, not 0/1.
Make igt_sysfs_get_boolean() helper useful for getting their values.

Signed-off-by: Janusz Krzysztofik <janusz.krzysztofik at linux.intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
---
 lib/igt_sysfs.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/lib/igt_sysfs.c b/lib/igt_sysfs.c
index c439944d..c2b8291d 100644
--- a/lib/igt_sysfs.c
+++ b/lib/igt_sysfs.c
@@ -474,11 +474,23 @@ bool igt_sysfs_set_u32(int dir, const char *attr, uint32_t value)
  */
 bool igt_sysfs_get_boolean(int dir, const char *attr)
 {
+	char *buf;
 	int result;
 
-	if (igt_sysfs_scanf(dir, attr, "%d", &result) != 1)
+	buf = igt_sysfs_get(dir, attr);
+	if (!buf)
 		return false;
 
+	if (sscanf(buf, "%d", &result) == 1)
+		goto out;
+
+	/* kernel's param_get_bool() returns "Y"/"N" */
+	if (!strcmp(buf, "Y"))
+		result = true;
+	else
+		result = false;
+out:
+	free(buf);
 	return result;
 }
 
-- 
2.21.0