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