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