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 "qemu/module.h"
  28#include "adb-internal.h"
  29
  30/* error codes */
  31#define ADB_RET_NOTPRESENT (-2)
  32
  33static void adb_device_reset(ADBDevice *d)
  34{
  35    qdev_reset_all(DEVICE(d));
  36}
  37
  38int 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 ? */
  63int 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
  89static const TypeInfo adb_bus_type_info = {
  90    .name = TYPE_ADB_BUS,
  91    .parent = TYPE_BUS,
  92    .instance_size = sizeof(ADBBusState),
  93};
  94
  95const 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
 106static 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
 118static 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
 124static 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
 133static 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
 141static void adb_register_types(void)
 142{
 143    type_register_static(&adb_bus_type_info);
 144    type_register_static(&adb_device_type_info);
 145}
 146
 147type_init(adb_register_types)
 148