xref: /qemu/hw/input/adb.c (revision 27a4a30e) 
1 /*
2  * QEMU ADB support
3  *
4  * Copyright (c) 2004 Fabrice Bellard
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 "hw/input/adb.h"
27 #include "hw/qdev-properties.h"
28 #include "migration/vmstate.h"
29 #include "qemu/module.h"
30 #include "adb-internal.h"
31 
32 /* error codes */
33 #define ADB_RET_NOTPRESENT (-2)
34 
35 static void adb_device_reset(ADBDevice *d)
36 {
37     qdev_reset_all(DEVICE(d));
38 }
39 
40 int adb_request(ADBBusState *s, uint8_t *obuf, const uint8_t *buf, int len)
41 {
42     ADBDevice *d;
43     int devaddr, cmd, i;
44 
45     cmd = buf[0] & 0xf;
46     if (cmd == ADB_BUSRESET) {
47         for(i = 0; i < s->nb_devices; i++) {
48             d = s->devices[i];
49             adb_device_reset(d);
50         }
51         return 0;
52     }
53     devaddr = buf[0] >> 4;
54     for(i = 0; i < s->nb_devices; i++) {
55         d = s->devices[i];
56         if (d->devaddr == devaddr) {
57             ADBDeviceClass *adc = ADB_DEVICE_GET_CLASS(d);
58             return adc->devreq(d, obuf, buf, len);
59         }
60     }
61     return ADB_RET_NOTPRESENT;
62 }
63 
64 /* XXX: move that to cuda ? */
65 int adb_poll(ADBBusState *s, uint8_t *obuf, uint16_t poll_mask)
66 {
67     ADBDevice *d;
68     int olen, i;
69     uint8_t buf[1];
70 
71     olen = 0;
72     for(i = 0; i < s->nb_devices; i++) {
73         if (s->poll_index >= s->nb_devices)
74             s->poll_index = 0;
75         d = s->devices[s->poll_index];
76         if ((1 << d->devaddr) & poll_mask) {
77             buf[0] = ADB_READREG | (d->devaddr << 4);
78             olen = adb_request(s, obuf + 1, buf, 1);
79             /* if there is data, we poll again the same device */
80             if (olen > 0) {
81                 obuf[0] = buf[0];
82                 olen++;
83                 break;
84             }
85         }
86         s->poll_index++;
87     }
88     return olen;
89 }
90 
91 static const TypeInfo adb_bus_type_info = {
92     .name = TYPE_ADB_BUS,
93     .parent = TYPE_BUS,
94     .instance_size = sizeof(ADBBusState),
95 };
96 
97 const VMStateDescription vmstate_adb_device = {
98     .name = "adb_device",
99     .version_id = 0,
100     .minimum_version_id = 0,
101     .fields = (VMStateField[]) {
102         VMSTATE_INT32(devaddr, ADBDevice),
103         VMSTATE_INT32(handler, ADBDevice),
104         VMSTATE_END_OF_LIST()
105     }
106 };
107 
108 static void adb_device_realizefn(DeviceState *dev, Error **errp)
109 {
110     ADBDevice *d = ADB_DEVICE(dev);
111     ADBBusState *bus = ADB_BUS(qdev_get_parent_bus(dev));
112 
113     if (bus->nb_devices >= MAX_ADB_DEVICES) {
114         return;
115     }
116 
117     bus->devices[bus->nb_devices++] = d;
118 }
119 
120 static Property adb_device_properties[] = {
121     DEFINE_PROP_BOOL("disable-direct-reg3-writes", ADBDevice,
122                      disable_direct_reg3_writes, false),
123     DEFINE_PROP_END_OF_LIST(),
124 };
125 
126 static void adb_device_class_init(ObjectClass *oc, void *data)
127 {
128     DeviceClass *dc = DEVICE_CLASS(oc);
129 
130     dc->realize = adb_device_realizefn;
131     device_class_set_props(dc, adb_device_properties);
132     dc->bus_type = TYPE_ADB_BUS;
133 }
134 
135 static const TypeInfo adb_device_type_info = {
136     .name = TYPE_ADB_DEVICE,
137     .parent = TYPE_DEVICE,
138     .instance_size = sizeof(ADBDevice),
139     .abstract = true,
140     .class_init = adb_device_class_init,
141 };
142 
143 static void adb_register_types(void)
144 {
145     type_register_static(&adb_bus_type_info);
146     type_register_static(&adb_device_type_info);
147 }
148 
149 type_init(adb_register_types)
150