[LTP] [PATCH v4 15/31] testcases: sysfs: sys_leds01

[Cyril Hrubis]

Add test for /sys/class/leds/*/* files.

Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
---
 include/tst_path_defs.h                       |  1 +
 runtest/sysfs                                 |  1 +
 testcases/kernel/sysfs/class/leds/.gitignore  |  1 +
 testcases/kernel/sysfs/class/leds/Makefile    |  7 ++
 .../kernel/sysfs/class/leds/sys_leds01.c      | 69 +++++++++++++++++++
 5 files changed, 79 insertions(+)
 create mode 100644 testcases/kernel/sysfs/class/leds/.gitignore
 create mode 100644 testcases/kernel/sysfs/class/leds/Makefile
 create mode 100644 testcases/kernel/sysfs/class/leds/sys_leds01.c

diff --git a/include/tst_path_defs.h b/include/tst_path_defs.h
index 7e9180ffe..67b0c4959 100644
--- a/include/tst_path_defs.h
+++ b/include/tst_path_defs.h
@@ -96,6 +96,7 @@
 #define PATH_CLASS_ATA_DEVICE			"/sys/class/ata_device"
 #define PATH_CLASS_BDI				"/sys/class/bdi"
 #define PATH_CLASS_HWMON			"/sys/class/hwmon"
+#define PATH_CLASS_LEDS			"/sys/class/leds"
 
 /* SYSFS DEVICES */
 #define PATH_SYS_CLOCKEVENTS			"/sys/devices/system/clockevents"
diff --git a/runtest/sysfs b/runtest/sysfs
index 23c7adc7a..f515c4c1e 100644
--- a/runtest/sysfs
+++ b/runtest/sysfs
@@ -11,3 +11,4 @@ sys_clockevents01 sys_clockevents01
 sys_ata01 sys_ata01
 sys_bdi01 sys_bdi01
 sys_hwmon01 sys_hwmon01
+sys_leds01 sys_leds01
diff --git a/testcases/kernel/sysfs/class/leds/.gitignore b/testcases/kernel/sysfs/class/leds/.gitignore
new file mode 100644
index 000000000..96e026b0d
--- /dev/null
+++ b/testcases/kernel/sysfs/class/leds/.gitignore
@@ -0,0 +1 @@
+/sys_leds01
diff --git a/testcases/kernel/sysfs/class/leds/Makefile b/testcases/kernel/sysfs/class/leds/Makefile
new file mode 100644
index 000000000..034038061
--- /dev/null
+++ b/testcases/kernel/sysfs/class/leds/Makefile
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Copyright (c) 2026 Cyril Hrubis <chrubis@suse.cz>
+
+top_srcdir		?= ../../../../..
+
+include $(top_srcdir)/include/mk/testcases.mk
+include $(top_srcdir)/include/mk/generic_leaf_target.mk
diff --git a/testcases/kernel/sysfs/class/leds/sys_leds01.c b/testcases/kernel/sysfs/class/leds/sys_leds01.c
new file mode 100644
index 000000000..68e7f2094
--- /dev/null
+++ b/testcases/kernel/sysfs/class/leds/sys_leds01.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2026 Cyril Hrubis <chrubis@suse.cz>
+ */
+
+/*\
+ * Sanity checks for the LED class devices exported under
+ * /sys/class/leds/<led>/.
+ *
+ * For every LED the test verifies that:
+ *
+ * - max_brightness is greater than zero
+ * - brightness is in the range [0, max_brightness]
+ * - trigger is a bracketed-choice file listing the available triggers with
+ *   exactly one of them selected via [] (the set of triggers is not checked
+ *   as it is highly kernel- and hardware-dependent)
+ *
+ * The test skips with TCONF when no LED device is present.
+ */
+
+#include <limits.h>
+#include <dirent.h>
+#include "tst_test.h"
+#include "tst_sysfs_assert.h"
+#include "tst_path_defs.h"
+
+static void check_led(const char *name)
+{
+	char trigger[64];
+
+	tst_res(TINFO, "Checking led '%s'", name);
+
+	TST_SYSFS_ASSERT_RANGELL(1, LONG_MAX, PATH_CLASS_LEDS "/%s/max_brightness", name);
+
+	TST_SYSFS_ASSERT_RANGELF(0, "brightness", "max_brightness",
+				  PATH_CLASS_LEDS "/%s/", name);
+
+	TST_SYSFS_ASSERT_CHOICE(NULL, trigger, sizeof(trigger),
+				PATH_CLASS_LEDS "/%s/trigger", name);
+}
+
+static void do_test(void)
+{
+	DIR *d;
+	struct dirent *ent;
+	int found = 0;
+
+	if (!tst_sysfs_exists(PATH_CLASS_LEDS))
+		tst_brk(TCONF, PATH_CLASS_LEDS ": not present");
+
+	d = SAFE_OPENDIR(PATH_CLASS_LEDS);
+
+	while ((ent = SAFE_READDIR(d))) {
+		if (ent->d_name[0] == '.')
+			continue;
+
+		found = 1;
+		check_led(ent->d_name);
+	}
+
+	SAFE_CLOSEDIR(d);
+
+	if (!found)
+		tst_res(TCONF, "No LED device found");
+}
+
+static struct tst_test test = {
+	.test_all = do_test,
+};
-- 
2.54.0