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123 lines
3.8 KiB
123 lines
3.8 KiB
/*
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* Copyright (C) 2011 The Android Open Source Project
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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 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 ANDROID_LOCAL_TIME_HAL_INTERFACE_H
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#define ANDROID_LOCAL_TIME_HAL_INTERFACE_H
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#include <stdint.h>
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#include <hardware/hardware.h>
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__BEGIN_DECLS
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/**
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* The id of this module
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*/
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#define LOCAL_TIME_HARDWARE_MODULE_ID "local_time"
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/**
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* Name of the local time devices to open
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*/
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#define LOCAL_TIME_HARDWARE_INTERFACE "local_time_hw_if"
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/**********************************************************************/
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/**
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* A structure used to collect low level sync data in a lab environment. Most
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* HAL implementations will never need this structure.
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*/
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struct local_time_debug_event {
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int64_t local_timesync_event_id;
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int64_t local_time;
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};
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/**
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* Every hardware module must have a data structure named HAL_MODULE_INFO_SYM
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* and the fields of this data structure must begin with hw_module_t
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* followed by module specific information.
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*/
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struct local_time_module {
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struct hw_module_t common;
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};
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struct local_time_hw_device {
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/**
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* Common methods of the local time hardware device. This *must* be the first member of
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* local_time_hw_device as users of this structure will cast a hw_device_t to
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* local_time_hw_device pointer in contexts where it's known the hw_device_t references a
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* local_time_hw_device.
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*/
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struct hw_device_t common;
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/**
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*
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* Returns the current value of the system wide local time counter
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*/
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int64_t (*get_local_time)(struct local_time_hw_device* dev);
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/**
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*
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* Returns the nominal frequency (in hertz) of the system wide local time
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* counter
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*/
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uint64_t (*get_local_freq)(struct local_time_hw_device* dev);
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/**
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*
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* Sets the HW slew rate of oscillator which drives the system wide local
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* time counter. On success, platforms should return 0. Platforms which
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* do not support HW slew should leave this method set to NULL.
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*
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* Valid values for rate range from MIN_INT16 to MAX_INT16. Platform
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* implementations should attempt map this range linearly to the min/max
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* slew rate of their hardware.
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*/
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int (*set_local_slew)(struct local_time_hw_device* dev, int16_t rate);
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/**
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*
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* A method used to collect low level sync data in a lab environments.
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* Most HAL implementations will simply set this member to NULL, or return
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* -EINVAL to indicate that this functionality is not supported.
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* Production HALs should never support this method.
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*/
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int (*get_debug_log)(struct local_time_hw_device* dev,
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struct local_time_debug_event* records,
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int max_records);
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};
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typedef struct local_time_hw_device local_time_hw_device_t;
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/** convenience API for opening and closing a supported device */
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static inline int local_time_hw_device_open(
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const struct hw_module_t* module,
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struct local_time_hw_device** device)
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{
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return module->methods->open(module, LOCAL_TIME_HARDWARE_INTERFACE,
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(struct hw_device_t**)device);
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}
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static inline int local_time_hw_device_close(struct local_time_hw_device* device)
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{
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return device->common.close(&device->common);
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}
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__END_DECLS
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#endif // ANDROID_LOCAL_TIME_INTERFACE_H
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