tpm: Allow reporting the internal state

It is useful to read information about the current TPM state, where
supported, e.g. for debugging purposes when verified boot fails.

Add support for this to the TPM interface as well as Cr50. Add a simple
sandbox test.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

1 files changed, 34 insertions, 0 deletions

diff --git a/test/dm/tpm.c b/test/dm/tpm.c
new file mode 100644
index 0000000000..0b46f79959
--- /dev/null
+++ b/test/dm/tpm.c
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2022 Google LLC
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <tpm_api.h>
+#include <dm/test.h>
+#include <test/test.h>
+#include <test/ut.h>
+
+/* Basic test of the TPM uclass */
+static int dm_test_tpm(struct unit_test_state *uts)
+{
+	struct udevice *dev;
+	char buf[50];
+
+	/* check probe success */
+	ut_assertok(uclass_first_device_err(UCLASS_TPM, &dev));
+	ut_assert(tpm_is_v2(dev));
+
+	ut_assert(tpm_report_state(dev, buf, sizeof(buf)));
+	ut_asserteq_str("init_done=0", buf);
+
+	ut_assertok(tpm_init(dev));
+
+	ut_assert(tpm_report_state(dev, buf, sizeof(buf)));
+	ut_asserteq_str("init_done=1", buf);
+
+	return 0;
+}
+DM_TEST(dm_test_tpm, UT_TESTF_SCAN_FDT);