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/*****************************************************************************
*
* mtdev - MT device event converter (MIT license)
*
* Copyright (C) 2010 Henrik Rydberg <rydberg@euromail.se>
* Copyright (C) 2010 Canonical Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
****************************************************************************/
#ifndef _MTDEV_PLUMBING_H
#define _MTDEV_PLUMBING_H
#include <mtdev.h>
/**
* mtdev_init - initialize mtdev converter
* @dev: the mtdev to initialize
*
* Sets up the internal data structures.
*
* Returns zero on success, negative error number otherwise.
*/
int mtdev_init(struct mtdev *dev);
/**
* mtdev_configure - configure the mtdev converter
* @dev: the mtdev to configure
* @fd: file descriptor of the kernel device
*
* Reads the device properties to set up the protocol capabilities.
* If preferred, this can be done by hand, omitting this call.
*
* Returns zero on success, negative error number otherwise.
*/
int mtdev_configure(struct mtdev *dev, int fd);
/**
* mtdev_fetch_event - fetch an event from the kernel device
* @dev: the mtdev in use
* @fd: file descriptor of the kernel device
* @ev: the kernel input event to fill
*
* Fetch a kernel event from the kernel device. The read operation
* behaves as dictated by the file descriptor; if O_NONBLOCK is not
* set, the read will block until an event is available.
*
* On success, returns the number of events read (0 or 1). Otherwise,
* a standard negative error number is returned.
*/
int mtdev_fetch_event(struct mtdev *dev, int fd, struct input_event *ev);
/**
* mtdev_put_event - put an event into the converter
* @dev: the mtdev in use
* @ev: the kernel input event to put
*
* Put a kernel event into the mtdev converter. The event should
* come straight from the device.
*
* This call does not block; if the buffer becomes full, older events
* are dropped. The buffer is guaranteed to handle several complete MT
* packets.
*/
void mtdev_put_event(struct mtdev *dev, const struct input_event *ev);
/**
* mtdev_empty - check if there are events to get
* @dev: the mtdev in use
*
* Returns true if the processed event queue is empty, false otherwise.
*/
int mtdev_empty(struct mtdev *dev);
/**
* mtdev_get_event - get processed events from mtdev
* @dev: the mtdev in use
* @ev: the input event to fill
*
* Get a processed event from mtdev. The events appear as if they came
* from a type B device emitting MT slot events.
*
* The queue must be non-empty before calling this function.
*/
void mtdev_get_event(struct mtdev *dev, struct input_event* ev);
#endif
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