xref: /openbmc/qemu/hw/input/adb.c (revision db725815985654007ade0fd53590d613fd657208)
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 "migration/vmstate.h"
28 #include "qemu/module.h"
29 #include "adb-internal.h"
30 
31 /* error codes */
32 #define ADB_RET_NOTPRESENT (-2)
33 
34 static void adb_device_reset(ADBDevice *d)
35 {
36     qdev_reset_all(DEVICE(d));
37 }
38 
39 int adb_request(ADBBusState *s, uint8_t *obuf, const uint8_t *buf, int len)
40 {
41     ADBDevice *d;
42     int devaddr, cmd, i;
43 
44     cmd = buf[0] & 0xf;
45     if (cmd == ADB_BUSRESET) {
46         for(i = 0; i < s->nb_devices; i++) {
47             d = s->devices[i];
48             adb_device_reset(d);
49         }
50         return 0;
51     }
52     devaddr = buf[0] >> 4;
53     for(i = 0; i < s->nb_devices; i++) {
54         d = s->devices[i];
55         if (d->devaddr == devaddr) {
56             ADBDeviceClass *adc = ADB_DEVICE_GET_CLASS(d);
57             return adc->devreq(d, obuf, buf, len);
58         }
59     }
60     return ADB_RET_NOTPRESENT;
61 }
62 
63 /* XXX: move that to cuda ? */
64 int adb_poll(ADBBusState *s, uint8_t *obuf, uint16_t poll_mask)
65 {
66     ADBDevice *d;
67     int olen, i;
68     uint8_t buf[1];
69 
70     olen = 0;
71     for(i = 0; i < s->nb_devices; i++) {
72         if (s->poll_index >= s->nb_devices)
73             s->poll_index = 0;
74         d = s->devices[s->poll_index];
75         if ((1 << d->devaddr) & poll_mask) {
76             buf[0] = ADB_READREG | (d->devaddr << 4);
77             olen = adb_request(s, obuf + 1, buf, 1);
78             /* if there is data, we poll again the same device */
79             if (olen > 0) {
80                 obuf[0] = buf[0];
81                 olen++;
82                 break;
83             }
84         }
85         s->poll_index++;
86     }
87     return olen;
88 }
89 
90 static const TypeInfo adb_bus_type_info = {
91     .name = TYPE_ADB_BUS,
92     .parent = TYPE_BUS,
93     .instance_size = sizeof(ADBBusState),
94 };
95 
96 const VMStateDescription vmstate_adb_device = {
97     .name = "adb_device",
98     .version_id = 0,
99     .minimum_version_id = 0,
100     .fields = (VMStateField[]) {
101         VMSTATE_INT32(devaddr, ADBDevice),
102         VMSTATE_INT32(handler, ADBDevice),
103         VMSTATE_END_OF_LIST()
104     }
105 };
106 
107 static void adb_device_realizefn(DeviceState *dev, Error **errp)
108 {
109     ADBDevice *d = ADB_DEVICE(dev);
110     ADBBusState *bus = ADB_BUS(qdev_get_parent_bus(dev));
111 
112     if (bus->nb_devices >= MAX_ADB_DEVICES) {
113         return;
114     }
115 
116     bus->devices[bus->nb_devices++] = d;
117 }
118 
119 static Property adb_device_properties[] = {
120     DEFINE_PROP_BOOL("disable-direct-reg3-writes", ADBDevice,
121                      disable_direct_reg3_writes, false),
122     DEFINE_PROP_END_OF_LIST(),
123 };
124 
125 static void adb_device_class_init(ObjectClass *oc, void *data)
126 {
127     DeviceClass *dc = DEVICE_CLASS(oc);
128 
129     dc->realize = adb_device_realizefn;
130     dc->props = adb_device_properties;
131     dc->bus_type = TYPE_ADB_BUS;
132 }
133 
134 static const TypeInfo adb_device_type_info = {
135     .name = TYPE_ADB_DEVICE,
136     .parent = TYPE_DEVICE,
137     .instance_size = sizeof(ADBDevice),
138     .abstract = true,
139     .class_init = adb_device_class_init,
140 };
141 
142 static void adb_register_types(void)
143 {
144     type_register_static(&adb_bus_type_info);
145     type_register_static(&adb_device_type_info);
146 }
147 
148 type_init(adb_register_types)
149