1 files changed, 52 insertions, 0 deletions
diff --git a/src/vendorcode/google/chromeos/dsm_calib.c b/src/vendorcode/google/chromeos/dsm_calib.c
new file mode 100644
index 0000000000..d3b14cb03c
--- /dev/null
+++ b/src/vendorcode/google/chromeos/dsm_calib.c
@@ -0,0 +1,52 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2019 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <console/console.h>
+#include <drivers/vpd/vpd.h>
+#include <stdint.h>
+#include <string.h>
+#include <types.h>
+#include <vendorcode/google/chromeos/chromeos.h>
+
+#define DSM_BUF_LEN 128
+#define DSM_PREFIX "dsm_calib_"
+
+enum cb_err get_dsm_calibration_from_key(const char *key, uint64_t *value)
+{
+	static char buf[DSM_BUF_LEN];
+	char *ret;
+	long value_from_vpd;
+
+	if (strncmp(key, DSM_PREFIX, strlen(DSM_PREFIX))) {
+		printk(BIOS_ERR, "got invalid dsm_calib key: %s\n", key);
+		return CB_ERR;
+	}
+
+	ret = vpd_gets(key, buf, DSM_BUF_LEN, VPD_RO);
+	if (!ret) {
+		printk(BIOS_ERR, "failed to find key in VPD: %s\n", key);
+		return CB_ERR;
+	}
+
+	value_from_vpd = atol(buf);
+	if (value_from_vpd <= 0) {
+		printk(BIOS_ERR, "got invalid dsm_calib from VPD: %ld\n", value_from_vpd);
+		return CB_ERR;
+	}
+
+	*value = value_from_vpd;
+
+	return CB_SUCCESS;
+}