1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26/*
27 * 5-Byte Mouse Protocol
28 */
29
30#include <sys/param.h>
31#include <sys/stream.h>
32#include <sys/strsun.h>
33#include <sys/vuid_event.h>
34#include "vuidmice.h"
35
36#define	LOGI_NUMBUTTONS		3		/* Number of buttons	*/
37
38#define	LOGI_BMASK		(uchar_t)7	/* Button mask in packet */
39#define	LOGI_NOT_BMASK		(uchar_t)(~LOGI_BMASK) /* Rest of the bits */
40#define	LOGI_START_CODE		(uchar_t)(0x80)	/* Start code in char	*/
41
42#define	LOGI_START		0		/* Beginning of packet	*/
43#define	LOGI_BUTTON		1		/* Got button status	*/
44#define	LOGI_DELTA_X1		2		/* First of 2 delta X	*/
45#define	LOGI_DELTA_Y1		3		/* First of 2 delta Y	*/
46#define	LOGI_DELTA_X2		4		/* Second of 2 delta X	*/
47
48extern void VUID_PUTNEXT(queue_t *const, uchar_t, uchar_t, uchar_t, int);
49
50int
51VUID_OPEN(queue_t *const qp)
52{
53	/*
54	 * The current kdmconfig tables imply that this module can be used
55	 * for both 2- and 3- button mice, so based on that evidence we
56	 * can't assume a constant.  I don't know whether it's possible
57	 * to autodetect.
58	 */
59	STATEP->nbuttons = 0;	/* Don't know. */
60
61	return (0);
62}
63
64static void
65vuidm5p_sendButtonEvent(queue_t *const qp)
66{
67	int b;
68
69	/* for each button, see if it has changed */
70	for (b = 0; b < 3; b++) {
71		uchar_t mask = 4 >> b;
72
73		if ((STATEP->buttons&mask) != (STATEP->oldbuttons&mask))
74			VUID_PUTNEXT(qp, BUT(b+1), FE_PAIR_NONE, 0,
75			    (STATEP->buttons & mask ? 1 : 0));
76	}
77}
78
79void
80vuidm5p(queue_t *const qp, mblk_t *mp)
81{
82	int r, code;
83	uchar_t *bufp;
84
85	bufp = mp->b_rptr;
86	r = MBLKL(mp);
87
88	for (r--; r >= 0; r--) {
89		code = *bufp++;
90
91		switch (STATEP->state) {
92			/*
93			 * Start state. We stay here if the start code is not
94			 * received thus forcing us back into sync. When we
95			 * get a start code the button mask comes with it
96			 * forcing us to the next state.
97			 */
98		default:
99resync:
100		case LOGI_START:
101			if ((code & LOGI_NOT_BMASK) != LOGI_START_CODE)
102				break;
103
104			STATEP->state   = LOGI_BUTTON;
105			STATEP->deltax  = STATEP->deltay = 0;
106			STATEP->buttons = (~code) & LOGI_BMASK;
107						/* or xlate[code & ] */
108			break;
109
110		case LOGI_BUTTON:
111			/*
112			 * We receive the first of 2 delta x which forces us
113			 * to the next state. We just add the values of each
114			 * delta x together.
115			 */
116			if ((code & LOGI_NOT_BMASK) == LOGI_START_CODE) {
117				STATEP->state = LOGI_START;
118				goto resync;
119			}
120
121			/* (The cast sign extends the 8-bit value.) */
122			STATEP->deltax += (signed char)code;
123			STATEP->state = LOGI_DELTA_X1;
124			break;
125
126		case LOGI_DELTA_X1:
127			/*
128			 * The first of 2 delta y. We just add
129			 * the 2 delta y together
130			 */
131			if ((code & LOGI_NOT_BMASK) == LOGI_START_CODE) {
132				STATEP->state = LOGI_START;
133				goto resync;
134			}
135
136			/* (The cast sign extends the 8-bit value.) */
137			STATEP->deltay += (signed char)code;
138			STATEP->state = LOGI_DELTA_Y1;
139			break;
140
141		case LOGI_DELTA_Y1:
142			/*
143			 * The second of 2 delta x. We just add
144			 * the 2 delta x together.
145			 */
146			if ((code & LOGI_NOT_BMASK) == LOGI_START_CODE) {
147				STATEP->state = LOGI_START;
148				goto resync;
149			}
150
151			/* (The cast sign extends the 8-bit value.) */
152			STATEP->deltax += (signed char)code;
153			STATEP->state = LOGI_DELTA_X2;
154			break;
155
156		case LOGI_DELTA_X2:
157			/*
158			 * The second of 2 delta y. We just add
159			 * the 2 delta y together.
160			 */
161			if ((code & LOGI_NOT_BMASK) == LOGI_START_CODE) {
162				STATEP->state = LOGI_START;
163				goto resync;
164			}
165
166			/* (The cast sign extends the 8-bit value.) */
167			STATEP->deltay += (signed char)code;
168			STATEP->state = LOGI_START;
169
170			/* check if motion has occurred and send event(s)... */
171			if (STATEP->deltax)
172				VUID_PUTNEXT(qp,
173				    (uchar_t)LOC_X_DELTA, FE_PAIR_ABSOLUTE,
174				    (uchar_t)LOC_X_ABSOLUTE, STATEP->deltax);
175
176			if (STATEP->deltay)
177				VUID_PUTNEXT(qp,
178				    (uchar_t)LOC_Y_DELTA, FE_PAIR_ABSOLUTE,
179				    (uchar_t)LOC_Y_ABSOLUTE, STATEP->deltay);
180
181			STATEP->deltax = STATEP->deltay = 0;
182
183			/* see if the buttons have changed */
184			if (STATEP->buttons != STATEP->oldbuttons) {
185				/* buttons have changed */
186				vuidm5p_sendButtonEvent(qp);
187
188				/* update new button state */
189				STATEP->oldbuttons = STATEP->buttons;
190			}
191		}
192	}
193	freemsg(mp);
194}
195