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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_H
#define _MTDEV_H
#include <linux/input.h>
/* includes available in 2.6.30-rc5 */
#ifndef BTN_TOOL_QUADTAP
#define BTN_TOOL_QUADTAP 0x14f /* Four fingers on trackpad */
#define ABS_MT_TOUCH_MAJOR 0x30 /* Major axis of touching ellipse */
#define ABS_MT_TOUCH_MINOR 0x31 /* Minor axis (omit if circular) */
#define ABS_MT_WIDTH_MAJOR 0x32 /* Major axis of approaching ellipse */
#define ABS_MT_WIDTH_MINOR 0x33 /* Minor axis (omit if circular) */
#define ABS_MT_ORIENTATION 0x34 /* Ellipse orientation */
#define ABS_MT_POSITION_X 0x35 /* Center X ellipse position */
#define ABS_MT_POSITION_Y 0x36 /* Center Y ellipse position */
#define ABS_MT_TOOL_TYPE 0x37 /* Type of touching device */
#define ABS_MT_BLOB_ID 0x38 /* Group a set of packets as a blob */
#define ABS_MT_TRACKING_ID 0x39 /* Unique ID of initiated contact */
#define SYN_MT_REPORT 2
#define MT_TOOL_FINGER 0
#define MT_TOOL_PEN 1
#endif
/* includes available in 2.6.33 */
#ifndef ABS_MT_PRESSURE
#define ABS_MT_PRESSURE 0x3a /* Pressure on contact area */
#endif
/* includes available in 2.6.36 */
#ifndef ABS_MT_SLOT
#define ABS_MT_SLOT 0x2f /* MT slot being modified */
#define MT_SLOT_ABS_EVENTS { \
ABS_MT_TOUCH_MAJOR, \
ABS_MT_TOUCH_MINOR, \
ABS_MT_WIDTH_MAJOR, \
ABS_MT_WIDTH_MINOR, \
ABS_MT_ORIENTATION, \
ABS_MT_POSITION_X, \
ABS_MT_POSITION_Y, \
ABS_MT_TOOL_TYPE, \
ABS_MT_BLOB_ID, \
ABS_MT_TRACKING_ID, \
ABS_MT_PRESSURE, \
}
#endif
#define MT_ABS_SIZE 11
/**
* struct mt_caps - protocol capabilities of kernel device
* @has_mtdata: true if the device has MT capabilities
* @has_slot: true if the device sends MT slots
* @nullid: tracking id used to represent null
* @slot: slot event properties
* @abs: ABS_MT event properties
*/
struct mtdev_caps {
int has_mtdata;
int has_slot;
int has_abs[MT_ABS_SIZE];
int nullid;
struct input_absinfo slot;
struct input_absinfo abs[MT_ABS_SIZE];
};
/**
* struct mtdev - represents an input MT device
* @caps: the kernel device protocol capabilities
* @state: internal mtdev parsing state
*
* The mtdev structure represents a kernel MT device type B, emitting
* MT slot events. The events put into mtdev may be from any MT
* device, specifically type A without contact tracking, type A with
* contact tracking, or type B with contact tracking. See the kernel
* documentation for further details.
*
*/
struct mtdev {
struct mtdev_caps caps;
struct mtdev_state *state;
};
/**
* 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_open - open an mtdev converter
* @dev: the mtdev to open
* @fd: file descriptor of the kernel device
*
* Initialize the mtdev structure and configure it by reading
* the protocol capabilities through the file descriptor.
*
* Returns zero on success, negative error number otherwise.
*
* This call combines mtdev_init() and mtdev_configure(), which
* may be used separately instead.
*/
int mtdev_open(struct mtdev *dev, int fd);
/**
* mtdev_idle - check state of kernel device
* @dev: the mtdev in use
* @fd: file descriptor of the kernel device
* @ms: number of milliseconds to wait for activity
*
* Returns true if the device is idle, i.e., there are no fetched
* events in the pipe and there is nothing to fetch from the device.
*/
int mtdev_idle(struct mtdev *dev, int fd, int ms);
/**
* mtdev_fetch - 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. Otherwise, a standard
* negative error number is returned.
*/
int mtdev_fetch(struct mtdev *dev, int fd, struct input_event *ev);
/**
* mtdev_put - 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(struct mtdev *dev, const struct input_event *ev);
/**
* mtdev_pull - pull events from the kernel device
* @dev: the mtdev in use
* @fd: file descriptor of the kernel device
* @max_events: max number of events to read (zero for all)
*
* Read a maxmimum of max_events events from the device, and put them
* in the converter. If max_events is zero, all available events will
* be read. The read operation behaves as dictated by the file
* descriptor; if O_NONBLOCK is not set, the read will block until
* max_events events are available or the buffer is full.
*
* On success, returns the number of events read. Otherwise, a standard
* negative error number is returned.
*
* This call combines mtdev_fetch() with mtdev_put(), which
* may be used separately instead.
*/
int mtdev_pull(struct mtdev *dev, int fd, int max_events);
/**
* mtdev_empty - check if there are events to get
* @dev: the mtdev in use
*
* Returns true if the event queue is empty, false otherwise.
*/
int mtdev_empty(struct mtdev *dev);
/**
* mtdev_get - get canonical events from mtdev
* @dev: the mtdev in use
* @ev: the input event to fill
*
* Get a canonical 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(struct mtdev *dev, struct input_event* ev);
/**
* mtdev_close - close the mtdev converter
* @dev: the mtdev to close
*
* Deallocates all memory associated with mtdev, and clears the mtdev
* structure.
*/
void mtdev_close(struct mtdev *dev);
#endif
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