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