1/*****************************************************************************
2 *
3 * mtdev - Multitouch Protocol Translation Library (MIT license)
4 *
5 * Copyright (C) 2010 Henrik Rydberg <rydberg@euromail.se>
6 * Copyright (C) 2010 Canonical Ltd.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the next
16 * paragraph) shall be included in all copies or substantial portions of the
17 * Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
24 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25 * DEALINGS IN THE SOFTWARE.
26 *
27 ****************************************************************************/
28
29#ifndef _MTDEV_H
30#define _MTDEV_H
31
32#ifdef __cplusplus
33extern "C" {
34#endif
35
36#include <linux/input.h>
37
38/* includes available in 2.6.30-rc5 */
39#ifndef BTN_TOOL_QUADTAP
40#define BTN_TOOL_QUADTAP 0x14f /* Four fingers on trackpad */
41#define ABS_MT_TOUCH_MAJOR 0x30 /* Major axis of touching ellipse */
42#define ABS_MT_TOUCH_MINOR 0x31 /* Minor axis (omit if circular) */
43#define ABS_MT_WIDTH_MAJOR 0x32 /* Major axis of approaching ellipse */
44#define ABS_MT_WIDTH_MINOR 0x33 /* Minor axis (omit if circular) */
45#define ABS_MT_ORIENTATION 0x34 /* Ellipse orientation */
46#define ABS_MT_POSITION_X 0x35 /* Center X ellipse position */
47#define ABS_MT_POSITION_Y 0x36 /* Center Y ellipse position */
48#define ABS_MT_TOOL_TYPE 0x37 /* Type of touching device */
49#define ABS_MT_BLOB_ID 0x38 /* Group a set of packets as a blob */
50#define ABS_MT_TRACKING_ID 0x39 /* Unique ID of initiated contact */
51#define SYN_MT_REPORT 2
52#define MT_TOOL_FINGER 0
53#define MT_TOOL_PEN 1
54#endif
55
56/* includes available in 2.6.33 */
57#ifndef ABS_MT_PRESSURE
58#define ABS_MT_PRESSURE 0x3a /* Pressure on contact area */
59#endif
60
61/* includes available in 2.6.36 */
62#ifndef ABS_MT_SLOT
63#define ABS_MT_SLOT 0x2f /* MT slot being modified */
64#endif
65
66/* includes available in 2.6.38 */
67#ifndef ABS_MT_DISTANCE
68#define ABS_MT_DISTANCE 0x3b /* Contact hover distance */
69#endif
70
71/* includes available in 3.4 */
72#ifndef EVIOCGMTSLOTS
73#define EVIOCGMTSLOTS(len) _IOC(_IOC_READ, 'E', 0x0a, len)
74#endif
75
76#define MT_ID_NULL (-1)
77#define MT_ID_MIN 0
78#define MT_ID_MAX 65535
79
80/**
81 * mtdev_new_open - create and open a new mtdev
82 * @fd: file descriptor of the kernel device
83 *
84 * Create a new mtdev and open the conversion.
85 *
86 * Returns zero in case of failure.
87 *
88 * This call combines the plumbing functions mtdev_new() and
89 * mtdev_open().
90 */
91struct mtdev *mtdev_new_open(int fd);
92
93/**
94 * mtdev_open - open an mtdev converter
95 * @dev: the mtdev to open
96 * @fd: file descriptor of the kernel device
97 *
98 * Initialize the mtdev structure and configure it by reading
99 * the protocol capabilities through the file descriptor.
100 *
101 * Returns zero on success, negative error number otherwise.
102 *
103 * This call combines the plumbing functions mtdev_init() and
104 * mtdev_configure().
105 */
106int mtdev_open(struct mtdev *dev, int fd);
107
108/**
109 * mtdev_has_mt_event - check for event type
110 * @dev: the mtdev in use
111 * @code: the ABS_MT code to look for
112 *
113 * Returns true if the given event code is present.
114 */
115int mtdev_has_mt_event(const struct mtdev *dev, int code);
116
117/**
118 * mtdev_get_abs_<property> - get abs event property
119 * @dev: the mtdev in use
120 * @code: the ABS_MT code to look for
121 *
122 * Returns NULL if code is not a valid ABS_MT code.
123 */
124int mtdev_get_abs_minimum(const struct mtdev *dev, int code);
125int mtdev_get_abs_maximum(const struct mtdev *dev, int code);
126int mtdev_get_abs_fuzz(const struct mtdev *dev, int code);
127int mtdev_get_abs_resolution(const struct mtdev *dev, int code);
128
129/**
130 * mtdev_idle - check state of kernel device
131 * @dev: the mtdev in use
132 * @fd: file descriptor of the kernel device
133 * @ms: number of milliseconds to wait for activity
134 *
135 * Returns true if the device is idle, i.e., there are no fetched
136 * events in the pipe and there is nothing to fetch from the device.
137 */
138int mtdev_idle(struct mtdev *dev, int fd, int ms);
139
140/**
141 * mtdev_get - get processed events from mtdev
142 * @dev: the mtdev in use
143 * @fd: file descriptor of the kernel device
144 * @ev: array of input events to fill
145 * @ev_max: maximum number of events to read
146 *
147 * Get a processed event from mtdev. The events appear as if they came
148 * from a type B device emitting MT slot events.
149 *
150 * The read operations involved behave as dictated by the file
151 * descriptor; if O_NONBLOCK is not set, mtdev_get() will block until
152 * the specified number of processed events are available.
153 *
154 * On success, returns the number of events read. Otherwise,
155 * a standard negative error number is returned.
156 *
157 * This call combines the plumbing functions mtdev_fetch_event(),
158 * mtdev_put_event() and mtdev_get_event().
159 */
160int mtdev_get(struct mtdev *dev, int fd, struct input_event* ev, int ev_max);
161
162/**
163 * mtdev_close - close the mtdev converter
164 * @dev: the mtdev to close
165 *
166 * Deallocates all memory associated with mtdev, and clears the mtdev
167 * structure.
168 */
169void mtdev_close(struct mtdev *dev);
170
171/**
172 * mtdev_close_delete - close conversion and delete mtdev
173 * @dev: the mtdev in use
174 *
175 * Flush pending buffers and deallocate all memory associated with
176 * mtdev. The device pointer is invalidated. This call combines the
177 * plumbing functions mtdev_close() and mtdev_delete().
178 */
179void mtdev_close_delete(struct mtdev *dev);
180
181#ifndef MTDEV_NO_LEGACY_API
182
183#define MT_ABS_SIZE 11
184#ifndef MT_SLOT_ABS_EVENTS
185#define MT_SLOT_ABS_EVENTS { \
186 ABS_MT_TOUCH_MAJOR, \
187 ABS_MT_TOUCH_MINOR, \
188 ABS_MT_WIDTH_MAJOR, \
189 ABS_MT_WIDTH_MINOR, \
190 ABS_MT_ORIENTATION, \
191 ABS_MT_POSITION_X, \
192 ABS_MT_POSITION_Y, \
193 ABS_MT_TOOL_TYPE, \
194 ABS_MT_BLOB_ID, \
195 ABS_MT_TRACKING_ID, \
196 ABS_MT_PRESSURE, \
197}
198#endif
199
200struct mtdev_caps {
201 int has_mtdata;
202 int has_slot;
203 int has_abs[MT_ABS_SIZE];
204 struct input_absinfo slot;
205 struct input_absinfo abs[MT_ABS_SIZE];
206};
207
208struct mtdev {
209 struct mtdev_caps caps;
210 struct mtdev_state *state;
211};
212
213#endif
214
215#ifdef __cplusplus
216}
217#endif
218
219#endif
220

source code of include/mtdev.h