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) 139