LXR qemu/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
  31static void adb_device_reset(ADBDevice *d)
  32{
  33    qdev_reset_all(DEVICE(d));
  34}
  35
  36int 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 ? */
  61int 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
  87static const TypeInfo adb_bus_type_info = {
  88    .name = TYPE_ADB_BUS,
  89    .parent = TYPE_BUS,
  90    .instance_size = sizeof(ADBBusState),
  91};
  92
  93const 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
 104static 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
 116static Property adb_device_properties[] = {
 117    DEFINE_PROP_BOOL("disable-direct-reg3-writes", ADBDevice,
 118                     disable_direct_reg3_writes, false),
 119    DEFINE_PROP_END_OF_LIST(),
 120};
 121
 122static void adb_device_class_init(ObjectClass *oc, void *data)
 123{
 124    DeviceClass *dc = DEVICE_CLASS(oc);
 125
 126    dc->realize = adb_device_realizefn;
 127    dc->props = adb_device_properties;
 128    dc->bus_type = TYPE_ADB_BUS;
 129}
 130
 131static const TypeInfo adb_device_type_info = {
 132    .name = TYPE_ADB_DEVICE,
 133    .parent = TYPE_DEVICE,
 134    .instance_size = sizeof(ADBDevice),
 135    .abstract = true,
 136    .class_init = adb_device_class_init,
 137};
 138
 139static void adb_register_types(void)
 140{
 141    type_register_static(&adb_bus_type_info);
 142    type_register_static(&adb_device_type_info);
 143}
 144
 145type_init(adb_register_types)
 146