68 lines
2 KiB
C
68 lines
2 KiB
C
/* Copyright 2013-2015 IBM Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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* implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __SENSOR_H
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#define __SENSOR_H
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/*
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* A sensor handler is a four bytes value which identifies a sensor by
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* its resource class (temperature, fans ...), a resource identifier
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* and an attribute number (data, status, ...) :
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*
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* Res.
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* | Attr. |Fam Class| Resource Id |
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* |--------|---|-----|----------------|
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*
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* The last 3bits of the resource class are used to hold the family
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* number. That leaves 32 differents resource classes. This is enough
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* for the FSP as it uses 15.
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*/
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/*
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* Helper routines to build or use the sensor handler.
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*/
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#define sensor_make_handler(family, class, rid, attr) \
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(((attr) << 24) | ((family) & 0x7) << 21 | ((class) & 0x1f) << 16 | \
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((rid) & 0xffff))
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#define sensor_get_family(handler) (((handler) >> 21) & 0x7)
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#define sensor_get_frc(handler) (((handler) >> 16) & 0x1f)
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#define sensor_get_rid(handler) ((handler) & 0xffff)
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#define sensor_get_attr(handler) ((handler) >> 24)
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/*
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* Sensor families
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*
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* This identifier is used to dispatch calls to OPAL_SENSOR_READ to
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* the appropriate component. FSP is the initial family and you can
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* have up to eight, as we are hijacking the last 3bits of the
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* resource class.
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*/
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enum {
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SENSOR_FSP = 0,
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SENSOR_OCC = 6,
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SENSOR_DTS = 7,
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};
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/*
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* root node of all sensors : /ibm,opal/sensors
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*/
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extern struct dt_node *sensor_node;
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extern void sensor_init(void);
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extern void check_sensor_read(int token);
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#endif /* __SENSOR_H */
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