1 files changed, 55 insertions, 0 deletions
diff --git a/roms/skiboot/include/sensor.h b/roms/skiboot/include/sensor.h
new file mode 100644
index 000000000..905bd501d
--- /dev/null
+++ b/roms/skiboot/include/sensor.h
@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+/* Copyright 2013-2017 IBM Corp. */
+
+#ifndef __SENSOR_H
+#define __SENSOR_H
+
+/*
+ * A sensor handler is a four bytes value which identifies a sensor by
+ * its resource class (temperature, fans ...), a resource identifier
+ * and an attribute number (data, status, ...) :
+ *
+ *                    Res.
+ *     | Attr.  |Fam Class|   Resource Id  |
+ *     |--------|---|-----|----------------|
+ *
+ * The last 3bits of the resource class are used to hold the family
+ * number. That leaves 32 differents resource classes. This is enough
+ * for the FSP as it uses 15.
+ */
+
+/*
+ * Helper routines to build or use the sensor handler.
+ */
+#define sensor_make_handler(family, class, rid, attr)			\
+	(((attr) << 24) | ((family) & 0x7) << 21 | ((class) & 0x1f) << 16 | \
+	 ((rid) & 0xffff))
+
+#define sensor_get_family(handler)	(((handler) >> 21) & 0x7)
+#define sensor_get_frc(handler)		(((handler) >> 16) & 0x1f)
+#define sensor_get_rid(handler)		((handler) & 0xffff)
+#define sensor_get_attr(handler)	((handler) >> 24)
+
+/*
+ * Sensor families
+ *
+ * This identifier is used to dispatch calls to OPAL_SENSOR_READ to
+ * the appropriate component. FSP is the initial family and you can
+ * have up to eight, as we are hijacking the last 3bits of the
+ * resource class.
+ */
+enum {
+	SENSOR_FSP = 0,
+	SENSOR_OCC = 6,
+	SENSOR_DTS = 7,
+};
+
+/*
+ * root node of all sensors : /ibm,opal/sensors
+ */
+extern struct dt_node *sensor_node;
+
+extern void sensor_init(void);
+extern void check_sensor_read(int token);
+
+#endif /* __SENSOR_H */