76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
/* The industrial I/O core - character device related
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*
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* Copyright (c) 2008 Jonathan Cameron
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#ifndef _IIO_CHRDEV_H_
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#define _IIO_CHRDEV_H_
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struct iio_dev;
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/**
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* struct iio_handler - Structure used to specify file operations
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* for a particular chrdev
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* @chrdev: character device structure
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* @id: the location in the handler table - used for deallocation.
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* @flags: file operations related flags including busy flag.
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* @private: handler specific data used by the fileops registered with
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* the chrdev.
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*/
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struct iio_handler {
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struct cdev chrdev;
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int id;
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unsigned long flags;
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void *private;
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};
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#define iio_cdev_to_handler(cd) \
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container_of(cd, struct iio_handler, chrdev)
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/**
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* struct iio_event_data - The actual event being pushed to userspace
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* @id: event identifier
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* @timestamp: best estimate of time of event occurrence (often from
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* the interrupt handler)
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*/
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struct iio_event_data {
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int id;
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s64 timestamp;
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};
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/**
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* struct iio_detected_event_list - list element for events that have occurred
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* @list: linked list header
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* @ev: the event itself
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*/
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struct iio_detected_event_list {
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struct list_head list;
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struct iio_event_data ev;
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};
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/**
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* struct iio_event_interface - chrdev interface for an event line
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* @dev: device assocated with event interface
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* @handler: fileoperations and related control for the chrdev
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* @wait: wait queue to allow blocking reads of events
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* @event_list_lock: mutex to protect the list of detected events
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* @det_events: list of detected events
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* @max_events: maximum number of events before new ones are dropped
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* @current_events: number of events in detected list
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*/
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struct iio_event_interface {
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struct device dev;
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struct iio_handler handler;
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wait_queue_head_t wait;
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struct mutex event_list_lock;
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struct list_head det_events;
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int max_events;
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int current_events;
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struct list_head dev_attr_list;
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};
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#endif
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