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
  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
  35static void adb_device_reset(ADBDevice *d)
  36{
  37    qdev_reset_all(DEVICE(d));
  38}
  39
  40int 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 ? */
  65int 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
  91static const TypeInfo adb_bus_type_info = {
  92    .name = TYPE_ADB_BUS,
  93    .parent = TYPE_BUS,
  94    .instance_size = sizeof(ADBBusState),
  95};
  96
  97const 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
 108static 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
 120static 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
 126static 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
 135static 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
 143static void adb_register_types(void)
 144{
 145    type_register_static(&adb_bus_type_info);
 146    type_register_static(&adb_device_type_info);
 147}
 148
 149type_init(adb_register_types)
 150