[LTP] [PATCH v3 18/31] testcases: sysfs: Add sys_thermal01

[Cyril Hrubis]

A test for /sys/class/thermal/cooling_device*/* files.

Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
---
 runtest/sysfs                                 |  1 +
 .../kernel/sysfs/class/thermal/.gitignore     |  1 +
 testcases/kernel/sysfs/class/thermal/Makefile |  7 ++
 .../sysfs/class/thermal/sys_thermal01.c       | 73 +++++++++++++++++++
 4 files changed, 82 insertions(+)
 create mode 100644 testcases/kernel/sysfs/class/thermal/.gitignore
 create mode 100644 testcases/kernel/sysfs/class/thermal/Makefile
 create mode 100644 testcases/kernel/sysfs/class/thermal/sys_thermal01.c

diff --git a/runtest/sysfs b/runtest/sysfs
index de58499be..454042ed0 100644
--- a/runtest/sysfs
+++ b/runtest/sysfs
@@ -14,3 +14,4 @@ sys_hwmon01 sys_hwmon01
 sys_leds01 sys_leds01
 sys_wakeup01 sys_wakeup01
 sys_rtc01 sys_rtc01
+sys_thermal01 sys_thermal01
diff --git a/testcases/kernel/sysfs/class/thermal/.gitignore b/testcases/kernel/sysfs/class/thermal/.gitignore
new file mode 100644
index 000000000..c551a2cde
--- /dev/null
+++ b/testcases/kernel/sysfs/class/thermal/.gitignore
@@ -0,0 +1 @@
+/sys_thermal01
diff --git a/testcases/kernel/sysfs/class/thermal/Makefile b/testcases/kernel/sysfs/class/thermal/Makefile
new file mode 100644
index 000000000..034038061
--- /dev/null
+++ b/testcases/kernel/sysfs/class/thermal/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/thermal/sys_thermal01.c b/testcases/kernel/sysfs/class/thermal/sys_thermal01.c
new file mode 100644
index 000000000..2ed1167ab
--- /dev/null
+++ b/testcases/kernel/sysfs/class/thermal/sys_thermal01.c
@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2026 Cyril Hrubis <chrubis@suse.cz>
+ */
+
+/*\
+ * Sanity checks for the thermal cooling devices exported under
+ * /sys/class/thermal/cooling_deviceN/.
+ *
+ * For every cooling device the test verifies that:
+ *
+ * - type is a non-empty string
+ * - max_state is non-negative
+ * - cur_state is in the range [0, max_state]
+ *
+ * The test skips with TCONF when no cooling device is present.
+ */
+
+#include <string.h>
+#include <dirent.h>
+#include <limits.h>
+#include "tst_test.h"
+#include "tst_sysfs_assert.h"
+
+#define THERMAL "/sys/class/thermal"
+
+static void check_cooling_device(const char *name)
+{
+	char type[64] = "";
+
+	tst_res(TINFO, "Checking %s", name);
+
+	TST_SYSFS_READ_STR(type, sizeof(type), THERMAL "/%s/type", name);
+
+	if (type[0] != '\0')
+		tst_res(TPASS, "%s: type = '%s'", name, type);
+	else
+		tst_res(TFAIL, "%s: type is empty", name);
+
+	TST_SYSFS_ASSERT_RANGELL(0, LONG_MAX, THERMAL "/%s/max_state", name);
+
+	TST_SYSFS_ASSERT_RANGELF(0, "cur_state", "max_state",
+				  THERMAL "/%s/", name);
+}
+
+static void do_test(void)
+{
+	DIR *d;
+	struct dirent *ent;
+	int found = 0;
+
+	if (!tst_sysfs_exists(THERMAL))
+		tst_brk(TCONF, THERMAL ": not present");
+
+	d = SAFE_OPENDIR(THERMAL);
+
+	while ((ent = SAFE_READDIR(d))) {
+		if (strncmp(ent->d_name, "cooling_device", 14))
+			continue;
+
+		found = 1;
+		check_cooling_device(ent->d_name);
+	}
+
+	SAFE_CLOSEDIR(d);
+
+	if (!found)
+		tst_res(TCONF, "No cooling device found");
+}
+
+static struct tst_test test = {
+	.test_all = do_test,
+};
-- 
2.51.0