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/*
* Google LWIS Top Level Device Driver
*
* Copyright (c) 2018 Google, LLC
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef LWIS_DEVICE_TOP_H_
#define LWIS_DEVICE_TOP_H_
#include "lwis_device.h"
#define SCRATCH_MEMORY_SIZE 16
/*
* struct lwis_event_subscribe_operations
* This struct contains the 'virtual' functions for lwis_device subclasses
* Top device should be the only device to implement it.
*/
struct lwis_event_subscribe_operations {
/* Subscribe an event for subscriber device */
int (*subscribe_event)(struct lwis_device *lwis_dev, int64_t trigger_event_id,
int trigger_device_id, int subscriber_device_id);
/* Unsubscribe an event for subscriber device */
int (*unsubscribe_event)(struct lwis_device *lwis_dev, int64_t trigger_event_id,
int subscriber_device_id);
/* Notify subscriber when an event is happening */
void (*notify_event_subscriber)(struct lwis_device *lwis_dev, int64_t trigger_event_id,
int64_t trigger_event_count,
int64_t trigger_event_timestamp);
/* Clean up event subscription hash table when unloading top device */
void (*release)(struct lwis_device *lwis_dev);
};
/*
* struct lwis_top_device
* "Derived" lwis_device struct, with added top device related elements.
*/
struct lwis_top_device {
struct lwis_device base_dev;
/* For testing purposes, scratch memory is used as register space in
* top device.
*/
uint8_t scratch_mem[SCRATCH_MEMORY_SIZE];
/* Hash table of event subscribers keyed by trigger event id */
DECLARE_HASHTABLE(event_subscribers, EVENT_HASH_BITS);
/* Subscription work */
struct kthread_work subscribe_work;
struct list_head emitted_event_list_work;
/* Subscription thread */
struct kthread_worker subscribe_worker;
struct task_struct *subscribe_worker_thread;
struct lwis_event_subscribe_operations subscribe_ops;
};
int lwis_top_device_init(void);
int lwis_top_device_deinit(void);
#endif /* LWIS_DEVICE_TOP_H_ */
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