core: add a platform op to read sensors

This patch introduces an initial framework to define a sensor_read
operation per platform. It also proposes a few helper routines to
work on the sensor 'handler' which identifies a sensor and attribute
in the OPAL_SENSOR_READ call.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/core/sensor.c b/core/sensor.c
new file mode 100644
index 0000000..2c96756
--- /dev/null
+++ b/core/sensor.c
@@ -0,0 +1,41 @@
+/* Copyright 2013-2015 IBM Corp.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *	http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ * implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+#include <sensor.h>
+#include <skiboot.h>
+#include <device.h>
+#include <opal.h>
+#include <opal-api.h>
+
+struct dt_node *sensor_node;
+
+static int64_t opal_sensor_read(uint32_t sensor_hndl, int token,
+		uint32_t *sensor_data)
+{
+	if (platform.sensor_read)
+		return platform.sensor_read(sensor_hndl, token, sensor_data);
+
+	return OPAL_PARAMETER;
+}
+
+void sensor_init(void)
+{
+	sensor_node = dt_new(opal_node, "sensors");
+
+	/* Register OPAL interface */
+	opal_register(OPAL_SENSOR_READ, opal_sensor_read, 3);
+}