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[qemu.git] / chardev / msmouse.c
1 /*
2 * QEMU Microsoft serial mouse emulation
3 *
4 * Copyright (c) 2008 Lubomir Rintel
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25 #include "qemu/osdep.h"
26 #include "qemu/module.h"
27 #include "chardev/char.h"
28 #include "ui/console.h"
29 #include "ui/input.h"
30 #include "qom/object.h"
31
32 #define MSMOUSE_LO6(n) ((n) & 0x3f)
33 #define MSMOUSE_HI2(n) (((n) & 0xc0) >> 6)
34
35 struct MouseChardev {
36 Chardev parent;
37
38 QemuInputHandlerState *hs;
39 int axis[INPUT_AXIS__MAX];
40 bool btns[INPUT_BUTTON__MAX];
41 bool btnc[INPUT_BUTTON__MAX];
42 uint8_t outbuf[32];
43 int outlen;
44 };
45 typedef struct MouseChardev MouseChardev;
46
47 #define TYPE_CHARDEV_MSMOUSE "chardev-msmouse"
48 DECLARE_INSTANCE_CHECKER(MouseChardev, MOUSE_CHARDEV,
49 TYPE_CHARDEV_MSMOUSE)
50
51 static void msmouse_chr_accept_input(Chardev *chr)
52 {
53 MouseChardev *mouse = MOUSE_CHARDEV(chr);
54 int len;
55
56 len = qemu_chr_be_can_write(chr);
57 if (len > mouse->outlen) {
58 len = mouse->outlen;
59 }
60 if (!len) {
61 return;
62 }
63
64 qemu_chr_be_write(chr, mouse->outbuf, len);
65 mouse->outlen -= len;
66 if (mouse->outlen) {
67 memmove(mouse->outbuf, mouse->outbuf + len, mouse->outlen);
68 }
69 }
70
71 static void msmouse_queue_event(MouseChardev *mouse)
72 {
73 unsigned char bytes[4] = { 0x40, 0x00, 0x00, 0x00 };
74 int dx, dy, count = 3;
75
76 dx = mouse->axis[INPUT_AXIS_X];
77 mouse->axis[INPUT_AXIS_X] = 0;
78
79 dy = mouse->axis[INPUT_AXIS_Y];
80 mouse->axis[INPUT_AXIS_Y] = 0;
81
82 /* Movement deltas */
83 bytes[0] |= (MSMOUSE_HI2(dy) << 2) | MSMOUSE_HI2(dx);
84 bytes[1] |= MSMOUSE_LO6(dx);
85 bytes[2] |= MSMOUSE_LO6(dy);
86
87 /* Buttons */
88 bytes[0] |= (mouse->btns[INPUT_BUTTON_LEFT] ? 0x20 : 0x00);
89 bytes[0] |= (mouse->btns[INPUT_BUTTON_RIGHT] ? 0x10 : 0x00);
90 if (mouse->btns[INPUT_BUTTON_MIDDLE] ||
91 mouse->btnc[INPUT_BUTTON_MIDDLE]) {
92 bytes[3] |= (mouse->btns[INPUT_BUTTON_MIDDLE] ? 0x20 : 0x00);
93 mouse->btnc[INPUT_BUTTON_MIDDLE] = false;
94 count = 4;
95 }
96
97 if (mouse->outlen <= sizeof(mouse->outbuf) - count) {
98 memcpy(mouse->outbuf + mouse->outlen, bytes, count);
99 mouse->outlen += count;
100 } else {
101 /* queue full -> drop event */
102 }
103 }
104
105 static void msmouse_input_event(DeviceState *dev, QemuConsole *src,
106 InputEvent *evt)
107 {
108 MouseChardev *mouse = MOUSE_CHARDEV(dev);
109 InputMoveEvent *move;
110 InputBtnEvent *btn;
111
112 switch (evt->type) {
113 case INPUT_EVENT_KIND_REL:
114 move = evt->u.rel.data;
115 mouse->axis[move->axis] += move->value;
116 break;
117
118 case INPUT_EVENT_KIND_BTN:
119 btn = evt->u.btn.data;
120 mouse->btns[btn->button] = btn->down;
121 mouse->btnc[btn->button] = true;
122 break;
123
124 default:
125 /* keep gcc happy */
126 break;
127 }
128 }
129
130 static void msmouse_input_sync(DeviceState *dev)
131 {
132 MouseChardev *mouse = MOUSE_CHARDEV(dev);
133 Chardev *chr = CHARDEV(dev);
134
135 msmouse_queue_event(mouse);
136 msmouse_chr_accept_input(chr);
137 }
138
139 static int msmouse_chr_write(struct Chardev *s, const uint8_t *buf, int len)
140 {
141 /* Ignore writes to mouse port */
142 return len;
143 }
144
145 static void char_msmouse_finalize(Object *obj)
146 {
147 MouseChardev *mouse = MOUSE_CHARDEV(obj);
148
149 qemu_input_handler_unregister(mouse->hs);
150 }
151
152 static QemuInputHandler msmouse_handler = {
153 .name = "QEMU Microsoft Mouse",
154 .mask = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_REL,
155 .event = msmouse_input_event,
156 .sync = msmouse_input_sync,
157 };
158
159 static void msmouse_chr_open(Chardev *chr,
160 ChardevBackend *backend,
161 bool *be_opened,
162 Error **errp)
163 {
164 MouseChardev *mouse = MOUSE_CHARDEV(chr);
165
166 *be_opened = false;
167 mouse->hs = qemu_input_handler_register((DeviceState *)mouse,
168 &msmouse_handler);
169 }
170
171 static void char_msmouse_class_init(ObjectClass *oc, void *data)
172 {
173 ChardevClass *cc = CHARDEV_CLASS(oc);
174
175 cc->open = msmouse_chr_open;
176 cc->chr_write = msmouse_chr_write;
177 cc->chr_accept_input = msmouse_chr_accept_input;
178 }
179
180 static const TypeInfo char_msmouse_type_info = {
181 .name = TYPE_CHARDEV_MSMOUSE,
182 .parent = TYPE_CHARDEV,
183 .instance_size = sizeof(MouseChardev),
184 .instance_finalize = char_msmouse_finalize,
185 .class_init = char_msmouse_class_init,
186 };
187
188 static void register_types(void)
189 {
190 type_register_static(&char_msmouse_type_info);
191 }
192
193 type_init(register_types);