Add PECI module and CPU temperature monitoring

Signed-off-by: Randall Spangler <rspangler@chromium.org>

BUG=chrome-os-partner:7493
TEST='powerbtn' to boot main processor, then 'temps' and 'pecitemp'

Change-Id: Id57526ebb37c8aecb05ecebccc2824f462b9de1a

1 files changed, 28 insertions, 0 deletions

diff --git a/include/peci.h b/include/peci.h
new file mode 100644
index 0000000000..95c9d0efe8
--- /dev/null
+++ b/include/peci.h
@@ -0,0 +1,28 @@
+/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* PECI module for Chrome EC */
+
+#ifndef __CROS_EC_PECI_H
+#define __CROS_EC_PECI_H
+
+#include "common.h"
+#include "temp_sensor.h"
+
+/* Initializes the module. */
+int peci_init(void);
+
+/* Returns the current CPU temperature in degrees K, or -1 if error.
+ *
+ * Note that the PECI interface is currently a little flaky; if you get an
+ * error, retry a bit later. */
+int peci_get_cpu_temp(void);
+
+/* Reads the CPU temperature sensor via PECI.  This interface is for the
+ * temperature sensor module.  Returns the temperature in degrees K, or -1 if
+ * error. */
+int peci_temp_sensor_read(const struct temp_sensor_t *sensor);
+
+#endif  /* __CROS_EC_PECI_H */