qdev: don't access name through info
[qemu.git] / hw / ssi.c
1 /*
2 * QEMU Synchronous Serial Interface support
3 *
4 * Copyright (c) 2009 CodeSourcery.
5 * Written by Paul Brook
6 *
7 * This code is licensed under the GNU GPL v2.
8 *
9 * Contributions after 2012-01-13 are licensed under the terms of the
10 * GNU GPL, version 2 or (at your option) any later version.
11 */
12
13 #include "ssi.h"
14
15 struct SSIBus {
16 BusState qbus;
17 };
18
19 static struct BusInfo ssi_bus_info = {
20 .name = "SSI",
21 .size = sizeof(SSIBus),
22 };
23
24 static int ssi_slave_init(DeviceState *dev, DeviceInfo *base_info)
25 {
26 SSISlaveInfo *info = container_of(base_info, SSISlaveInfo, qdev);
27 SSISlave *s = SSI_SLAVE_FROM_QDEV(dev);
28 SSIBus *bus;
29
30 bus = FROM_QBUS(SSIBus, qdev_get_parent_bus(dev));
31 if (QTAILQ_FIRST(&bus->qbus.children) != dev
32 || QTAILQ_NEXT(dev, sibling) != NULL) {
33 hw_error("Too many devices on SSI bus");
34 }
35
36 s->info = info;
37 return info->init(s);
38 }
39
40 void ssi_register_slave(SSISlaveInfo *info)
41 {
42 assert(info->qdev.size >= sizeof(SSISlave));
43 info->qdev.init = ssi_slave_init;
44 info->qdev.bus_info = &ssi_bus_info;
45 qdev_register(&info->qdev);
46 }
47
48 DeviceState *ssi_create_slave(SSIBus *bus, const char *name)
49 {
50 DeviceState *dev;
51 dev = qdev_create(&bus->qbus, name);
52 qdev_init_nofail(dev);
53 return dev;
54 }
55
56 SSIBus *ssi_create_bus(DeviceState *parent, const char *name)
57 {
58 BusState *bus;
59 bus = qbus_create(&ssi_bus_info, parent, name);
60 return FROM_QBUS(SSIBus, bus);
61 }
62
63 uint32_t ssi_transfer(SSIBus *bus, uint32_t val)
64 {
65 DeviceState *dev;
66 SSISlave *slave;
67 dev = QTAILQ_FIRST(&bus->qbus.children);
68 if (!dev) {
69 return 0;
70 }
71 slave = SSI_SLAVE_FROM_QDEV(dev);
72 return slave->info->transfer(slave, val);
73 }