xref: /openbmc/qemu/hw/i386/vmmouse.c (revision 979a8902) 
1 /*
2  * QEMU VMMouse emulation
3  *
4  * Copyright (C) 2007 Anthony Liguori <anthony@codemonkey.ws>
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 "qapi/error.h"
27 #include "ui/console.h"
28 #include "hw/i386/pc.h"
29 #include "hw/input/i8042.h"
30 #include "hw/qdev-properties.h"
31 #include "migration/vmstate.h"
32 
33 /* debug only vmmouse */
34 //#define DEBUG_VMMOUSE
35 
36 /* VMMouse Commands */
37 #define VMMOUSE_GETVERSION	10
38 #define VMMOUSE_DATA		39
39 #define VMMOUSE_STATUS		40
40 #define VMMOUSE_COMMAND		41
41 
42 #define VMMOUSE_READ_ID			0x45414552
43 #define VMMOUSE_DISABLE			0x000000f5
44 #define VMMOUSE_REQUEST_RELATIVE	0x4c455252
45 #define VMMOUSE_REQUEST_ABSOLUTE	0x53424152
46 
47 #define VMMOUSE_QUEUE_SIZE	1024
48 
49 #define VMMOUSE_VERSION		0x3442554a
50 
51 #ifdef DEBUG_VMMOUSE
52 #define DPRINTF(fmt, ...) printf(fmt, ## __VA_ARGS__)
53 #else
54 #define DPRINTF(fmt, ...) do { } while (0)
55 #endif
56 
57 #define TYPE_VMMOUSE "vmmouse"
58 #define VMMOUSE(obj) OBJECT_CHECK(VMMouseState, (obj), TYPE_VMMOUSE)
59 
60 typedef struct VMMouseState
61 {
62     ISADevice parent_obj;
63 
64     uint32_t queue[VMMOUSE_QUEUE_SIZE];
65     int32_t queue_size;
66     uint16_t nb_queue;
67     uint16_t status;
68     uint8_t absolute;
69     QEMUPutMouseEntry *entry;
70     ISAKBDState *i8042;
71 } VMMouseState;
72 
73 static uint32_t vmmouse_get_status(VMMouseState *s)
74 {
75     DPRINTF("vmmouse_get_status()\n");
76     return (s->status << 16) | s->nb_queue;
77 }
78 
79 static void vmmouse_mouse_event(void *opaque, int x, int y, int dz, int buttons_state)
80 {
81     VMMouseState *s = opaque;
82     int buttons = 0;
83 
84     if (s->nb_queue > (VMMOUSE_QUEUE_SIZE - 4))
85         return;
86 
87     DPRINTF("vmmouse_mouse_event(%d, %d, %d, %d)\n",
88             x, y, dz, buttons_state);
89 
90     if ((buttons_state & MOUSE_EVENT_LBUTTON))
91         buttons |= 0x20;
92     if ((buttons_state & MOUSE_EVENT_RBUTTON))
93         buttons |= 0x10;
94     if ((buttons_state & MOUSE_EVENT_MBUTTON))
95         buttons |= 0x08;
96 
97     if (s->absolute) {
98         x <<= 1;
99         y <<= 1;
100     }
101 
102     s->queue[s->nb_queue++] = buttons;
103     s->queue[s->nb_queue++] = x;
104     s->queue[s->nb_queue++] = y;
105     s->queue[s->nb_queue++] = dz;
106 
107     /* need to still generate PS2 events to notify driver to
108        read from queue */
109     i8042_isa_mouse_fake_event(s->i8042);
110 }
111 
112 static void vmmouse_remove_handler(VMMouseState *s)
113 {
114     if (s->entry) {
115         qemu_remove_mouse_event_handler(s->entry);
116         s->entry = NULL;
117     }
118 }
119 
120 static void vmmouse_update_handler(VMMouseState *s, int absolute)
121 {
122     if (s->status != 0) {
123         return;
124     }
125     if (s->absolute != absolute) {
126         s->absolute = absolute;
127         vmmouse_remove_handler(s);
128     }
129     if (s->entry == NULL) {
130         s->entry = qemu_add_mouse_event_handler(vmmouse_mouse_event,
131                                                 s, s->absolute,
132                                                 "vmmouse");
133         qemu_activate_mouse_event_handler(s->entry);
134     }
135 }
136 
137 static void vmmouse_read_id(VMMouseState *s)
138 {
139     DPRINTF("vmmouse_read_id()\n");
140 
141     if (s->nb_queue == VMMOUSE_QUEUE_SIZE)
142         return;
143 
144     s->queue[s->nb_queue++] = VMMOUSE_VERSION;
145     s->status = 0;
146 }
147 
148 static void vmmouse_request_relative(VMMouseState *s)
149 {
150     DPRINTF("vmmouse_request_relative()\n");
151     vmmouse_update_handler(s, 0);
152 }
153 
154 static void vmmouse_request_absolute(VMMouseState *s)
155 {
156     DPRINTF("vmmouse_request_absolute()\n");
157     vmmouse_update_handler(s, 1);
158 }
159 
160 static void vmmouse_disable(VMMouseState *s)
161 {
162     DPRINTF("vmmouse_disable()\n");
163     s->status = 0xffff;
164     vmmouse_remove_handler(s);
165 }
166 
167 static void vmmouse_data(VMMouseState *s, uint32_t *data, uint32_t size)
168 {
169     int i;
170 
171     DPRINTF("vmmouse_data(%d)\n", size);
172 
173     if (size == 0 || size > 6 || size > s->nb_queue) {
174         printf("vmmouse: driver requested too much data %d\n", size);
175         s->status = 0xffff;
176         vmmouse_remove_handler(s);
177         return;
178     }
179 
180     for (i = 0; i < size; i++)
181         data[i] = s->queue[i];
182 
183     s->nb_queue -= size;
184     if (s->nb_queue)
185         memmove(s->queue, &s->queue[size], sizeof(s->queue[0]) * s->nb_queue);
186 }
187 
188 static uint32_t vmmouse_ioport_read(void *opaque, uint32_t addr)
189 {
190     VMMouseState *s = opaque;
191     uint32_t data[6];
192     uint16_t command;
193 
194     vmmouse_get_data(data);
195 
196     command = data[2] & 0xFFFF;
197 
198     switch (command) {
199     case VMMOUSE_STATUS:
200         data[0] = vmmouse_get_status(s);
201         break;
202     case VMMOUSE_COMMAND:
203         switch (data[1]) {
204         case VMMOUSE_DISABLE:
205             vmmouse_disable(s);
206             break;
207         case VMMOUSE_READ_ID:
208             vmmouse_read_id(s);
209             break;
210         case VMMOUSE_REQUEST_RELATIVE:
211             vmmouse_request_relative(s);
212             break;
213         case VMMOUSE_REQUEST_ABSOLUTE:
214             vmmouse_request_absolute(s);
215             break;
216         default:
217             printf("vmmouse: unknown command %x\n", data[1]);
218             break;
219         }
220         break;
221     case VMMOUSE_DATA:
222         vmmouse_data(s, data, data[1]);
223         break;
224     default:
225         printf("vmmouse: unknown command %x\n", command);
226         break;
227     }
228 
229     vmmouse_set_data(data);
230     return data[0];
231 }
232 
233 static int vmmouse_post_load(void *opaque, int version_id)
234 {
235     VMMouseState *s = opaque;
236 
237     vmmouse_remove_handler(s);
238     vmmouse_update_handler(s, s->absolute);
239     return 0;
240 }
241 
242 static const VMStateDescription vmstate_vmmouse = {
243     .name = "vmmouse",
244     .version_id = 0,
245     .minimum_version_id = 0,
246     .post_load = vmmouse_post_load,
247     .fields = (VMStateField[]) {
248         VMSTATE_INT32_EQUAL(queue_size, VMMouseState, NULL),
249         VMSTATE_UINT32_ARRAY(queue, VMMouseState, VMMOUSE_QUEUE_SIZE),
250         VMSTATE_UINT16(nb_queue, VMMouseState),
251         VMSTATE_UINT16(status, VMMouseState),
252         VMSTATE_UINT8(absolute, VMMouseState),
253         VMSTATE_END_OF_LIST()
254     }
255 };
256 
257 static void vmmouse_reset(DeviceState *d)
258 {
259     VMMouseState *s = VMMOUSE(d);
260 
261     s->queue_size = VMMOUSE_QUEUE_SIZE;
262     s->nb_queue = 0;
263 
264     vmmouse_disable(s);
265 }
266 
267 static void vmmouse_realizefn(DeviceState *dev, Error **errp)
268 {
269     VMMouseState *s = VMMOUSE(dev);
270 
271     DPRINTF("vmmouse_init\n");
272 
273     if (!object_resolve_path_type("", TYPE_VMPORT, NULL)) {
274         error_setg(errp, "vmmouse needs a machine with vmport");
275         return;
276     }
277 
278     vmport_register(VMMOUSE_STATUS, vmmouse_ioport_read, s);
279     vmport_register(VMMOUSE_COMMAND, vmmouse_ioport_read, s);
280     vmport_register(VMMOUSE_DATA, vmmouse_ioport_read, s);
281 }
282 
283 static Property vmmouse_properties[] = {
284     DEFINE_PROP_LINK("i8042", VMMouseState, i8042, TYPE_I8042, ISAKBDState *),
285     DEFINE_PROP_END_OF_LIST(),
286 };
287 
288 static void vmmouse_class_initfn(ObjectClass *klass, void *data)
289 {
290     DeviceClass *dc = DEVICE_CLASS(klass);
291 
292     dc->realize = vmmouse_realizefn;
293     dc->reset = vmmouse_reset;
294     dc->vmsd = &vmstate_vmmouse;
295     device_class_set_props(dc, vmmouse_properties);
296 }
297 
298 static const TypeInfo vmmouse_info = {
299     .name          = TYPE_VMMOUSE,
300     .parent        = TYPE_ISA_DEVICE,
301     .instance_size = sizeof(VMMouseState),
302     .class_init    = vmmouse_class_initfn,
303 };
304 
305 static void vmmouse_register_types(void)
306 {
307     type_register_static(&vmmouse_info);
308 }
309 
310 type_init(vmmouse_register_types)
311