hw/input/adb.c

   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     dc->props = 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)