1 /* $NetBSD: button.h,v 1.1 2006/09/01 21:26:18 uwe Exp $ */ 2 3 /* 4 * Copyright (c) 2003 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #ifndef _MACHINE_BUTTON_H_ 39 #define _MACHINE_BUTTON_H_ 40 41 #include <sys/ioccom.h> 42 43 #define BUTTON_EVENT_PRESSED 0 /* button pressed */ 44 #define BUTTON_EVENT_RELEASED 1 /* button released */ 45 46 #define BUTTON_STATE_PRESSED 0 /* button pressed */ 47 #define BUTTON_STATE_RELEASED 1 /* button released */ 48 #define BUTTON_STATE_UNKNOWN -1 49 50 /* 51 * This structure describes the state of a button. It is used 52 * by the BUTTON_IOC_GET_SWSTATE ioctl, as well as in button 53 * event messages. 54 */ 55 struct button_state { 56 char bs_name[32]; /* button name */ 57 int32_t bs_state; /* state of the switch/event */ 58 }; 59 60 /* 61 * button event messages: 62 * 63 * We ensure that a message is always exactly 32 bytes long, so that 64 * userland doesn't need to issue multiple reads to get a single event. 65 */ 66 #define BUTTON_EVENT_MSG_SIZE 32 67 68 #define BUTTON_EVENT_STATE_CHANGE 0 69 70 typedef struct { 71 int32_t bev_type; /* button event type */ 72 union { 73 int32_t _bev_d_space[(BUTTON_EVENT_MSG_SIZE / 74 sizeof(int32_t)) - 1]; 75 76 /* 77 * This field is used for: 78 * 79 * BUTTON_EVENT_STATE_CHANGE 80 */ 81 struct button_state _bev_d_event; 82 } _bev_data; 83 } button_event_t; 84 85 #define bev_event _bev_data._bev_d_event 86 87 /* 88 * BUTTON_IOC_GET_TYPE: 89 * 90 * Get the button back-end type. 91 */ 92 struct button_type { 93 char button_type[32]; 94 }; 95 #define BUTTON_IOC_GET_TYPE _IOR('P', 1, sizeof(struct button_type)) 96 97 #endif /* _MACHINE_BUTTON_H_ */ 98