* Copyright (c) 2007 CodeSourcery.
* Written by Paul Brook
*
- * This code is licenced under the LGPL.
+ * This code is licensed under the LGPL.
*/
#include "i2c.h"
struct i2c_bus
{
BusState qbus;
- i2c_slave *current_dev;
- i2c_slave *dev;
- int saved_address;
+ I2CSlave *current_dev;
+ I2CSlave *dev;
+ uint8_t saved_address;
};
-static struct BusInfo i2c_bus_info = {
- .name = "I2C",
- .size = sizeof(i2c_bus),
- .props = (Property[]) {
- DEFINE_PROP_UINT32("address", struct i2c_slave, address, 0),
- DEFINE_PROP_END_OF_LIST(),
- }
+static Property i2c_props[] = {
+ DEFINE_PROP_UINT8("address", struct I2CSlave, address, 0),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+#define TYPE_I2C_BUS "i2c-bus"
+#define I2C_BUS(obj) OBJECT_CHECK(i2c_bus, (obj), TYPE_I2C_BUS)
+
+static const TypeInfo i2c_bus_info = {
+ .name = TYPE_I2C_BUS,
+ .parent = TYPE_BUS,
+ .instance_size = sizeof(i2c_bus),
};
-static void i2c_bus_save(QEMUFile *f, void *opaque)
+static void i2c_bus_pre_save(void *opaque)
{
- i2c_bus *bus = (i2c_bus *)opaque;
+ i2c_bus *bus = opaque;
- qemu_put_byte(f, bus->current_dev ? bus->current_dev->address : -1);
+ bus->saved_address = bus->current_dev ? bus->current_dev->address : -1;
}
-static int i2c_bus_load(QEMUFile *f, void *opaque, int version_id)
+static int i2c_bus_post_load(void *opaque, int version_id)
{
- i2c_bus *bus = (i2c_bus *)opaque;
-
- if (version_id != 1)
- return -EINVAL;
+ i2c_bus *bus = opaque;
/* The bus is loaded before attached devices, so load and save the
current device id. Devices will check themselves as loaded. */
- bus->saved_address = (int8_t) qemu_get_byte(f);
bus->current_dev = NULL;
-
return 0;
}
+static const VMStateDescription vmstate_i2c_bus = {
+ .name = "i2c_bus",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .minimum_version_id_old = 1,
+ .pre_save = i2c_bus_pre_save,
+ .post_load = i2c_bus_post_load,
+ .fields = (VMStateField []) {
+ VMSTATE_UINT8(saved_address, i2c_bus),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
/* Create a new I2C bus. */
i2c_bus *i2c_init_bus(DeviceState *parent, const char *name)
{
i2c_bus *bus;
- bus = FROM_QBUS(i2c_bus, qbus_create(&i2c_bus_info, parent, name));
- register_savevm("i2c_bus", -1, 1, i2c_bus_save, i2c_bus_load, bus);
+ bus = FROM_QBUS(i2c_bus, qbus_create(TYPE_I2C_BUS, parent, name));
+ vmstate_register(NULL, -1, &vmstate_i2c_bus, bus);
return bus;
}
-void i2c_set_slave_address(i2c_slave *dev, int address)
+void i2c_set_slave_address(I2CSlave *dev, uint8_t address)
{
dev->address = address;
}
/* Returns non-zero if the address is not valid. */
/* TODO: Make this handle multiple masters. */
-int i2c_start_transfer(i2c_bus *bus, int address, int recv)
+int i2c_start_transfer(i2c_bus *bus, uint8_t address, int recv)
{
- DeviceState *qdev;
- i2c_slave *slave = NULL;
+ BusChild *kid;
+ I2CSlave *slave = NULL;
+ I2CSlaveClass *sc;
- QLIST_FOREACH(qdev, &bus->qbus.children, sibling) {
- slave = I2C_SLAVE_FROM_QDEV(qdev);
- if (slave->address == address)
+ QTAILQ_FOREACH(kid, &bus->qbus.children, sibling) {
+ DeviceState *qdev = kid->child;
+ I2CSlave *candidate = I2C_SLAVE(qdev);
+ if (candidate->address == address) {
+ slave = candidate;
break;
+ }
}
- if (!slave)
+ if (!slave) {
return 1;
+ }
+ sc = I2C_SLAVE_GET_CLASS(slave);
/* If the bus is already busy, assume this is a repeated
start condition. */
bus->current_dev = slave;
- slave->info->event(slave, recv ? I2C_START_RECV : I2C_START_SEND);
+ if (sc->event) {
+ sc->event(slave, recv ? I2C_START_RECV : I2C_START_SEND);
+ }
return 0;
}
void i2c_end_transfer(i2c_bus *bus)
{
- i2c_slave *dev = bus->current_dev;
+ I2CSlave *dev = bus->current_dev;
+ I2CSlaveClass *sc;
- if (!dev)
+ if (!dev) {
return;
+ }
- dev->info->event(dev, I2C_FINISH);
+ sc = I2C_SLAVE_GET_CLASS(dev);
+ if (sc->event) {
+ sc->event(dev, I2C_FINISH);
+ }
bus->current_dev = NULL;
}
int i2c_send(i2c_bus *bus, uint8_t data)
{
- i2c_slave *dev = bus->current_dev;
+ I2CSlave *dev = bus->current_dev;
+ I2CSlaveClass *sc;
- if (!dev)
+ if (!dev) {
return -1;
+ }
+
+ sc = I2C_SLAVE_GET_CLASS(dev);
+ if (sc->send) {
+ return sc->send(dev, data);
+ }
- return dev->info->send(dev, data);
+ return -1;
}
int i2c_recv(i2c_bus *bus)
{
- i2c_slave *dev = bus->current_dev;
+ I2CSlave *dev = bus->current_dev;
+ I2CSlaveClass *sc;
- if (!dev)
+ if (!dev) {
return -1;
+ }
+
+ sc = I2C_SLAVE_GET_CLASS(dev);
+ if (sc->recv) {
+ return sc->recv(dev);
+ }
- return dev->info->recv(dev);
+ return -1;
}
void i2c_nack(i2c_bus *bus)
{
- i2c_slave *dev = bus->current_dev;
+ I2CSlave *dev = bus->current_dev;
+ I2CSlaveClass *sc;
- if (!dev)
+ if (!dev) {
return;
+ }
- dev->info->event(dev, I2C_NACK);
-}
-
-void i2c_slave_save(QEMUFile *f, i2c_slave *dev)
-{
- qemu_put_byte(f, dev->address);
+ sc = I2C_SLAVE_GET_CLASS(dev);
+ if (sc->event) {
+ sc->event(dev, I2C_NACK);
+ }
}
-void i2c_slave_load(QEMUFile *f, i2c_slave *dev)
+static int i2c_slave_post_load(void *opaque, int version_id)
{
+ I2CSlave *dev = opaque;
i2c_bus *bus;
bus = FROM_QBUS(i2c_bus, qdev_get_parent_bus(&dev->qdev));
- dev->address = qemu_get_byte(f);
if (bus->saved_address == dev->address) {
bus->current_dev = dev;
}
+ return 0;
}
-static int i2c_slave_qdev_init(DeviceState *dev, DeviceInfo *base)
-{
- I2CSlaveInfo *info = container_of(base, I2CSlaveInfo, qdev);
- i2c_slave *s = I2C_SLAVE_FROM_QDEV(dev);
-
- s->info = info;
-
- return info->init(s);
-}
+const VMStateDescription vmstate_i2c_slave = {
+ .name = "I2CSlave",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .minimum_version_id_old = 1,
+ .post_load = i2c_slave_post_load,
+ .fields = (VMStateField []) {
+ VMSTATE_UINT8(address, I2CSlave),
+ VMSTATE_END_OF_LIST()
+ }
+};
-void i2c_register_slave(I2CSlaveInfo *info)
+static int i2c_slave_qdev_init(DeviceState *dev)
{
- assert(info->qdev.size >= sizeof(i2c_slave));
- info->qdev.init = i2c_slave_qdev_init;
- info->qdev.bus_info = &i2c_bus_info;
- qdev_register(&info->qdev);
+ I2CSlave *s = I2C_SLAVE(dev);
+ I2CSlaveClass *sc = I2C_SLAVE_GET_CLASS(s);
+
+ return sc->init(s);
}
-DeviceState *i2c_create_slave(i2c_bus *bus, const char *name, int addr)
+DeviceState *i2c_create_slave(i2c_bus *bus, const char *name, uint8_t addr)
{
DeviceState *dev;
dev = qdev_create(&bus->qbus, name);
- qdev_prop_set_uint32(dev, "address", addr);
- qdev_init(dev);
+ qdev_prop_set_uint8(dev, "address", addr);
+ qdev_init_nofail(dev);
return dev;
}
+
+static void i2c_slave_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *k = DEVICE_CLASS(klass);
+ k->init = i2c_slave_qdev_init;
+ k->bus_type = TYPE_I2C_BUS;
+ k->props = i2c_props;
+}
+
+static const TypeInfo i2c_slave_type_info = {
+ .name = TYPE_I2C_SLAVE,
+ .parent = TYPE_DEVICE,
+ .instance_size = sizeof(I2CSlave),
+ .abstract = true,
+ .class_size = sizeof(I2CSlaveClass),
+ .class_init = i2c_slave_class_init,
+};
+
+static void i2c_slave_register_types(void)
+{
+ type_register_static(&i2c_bus_info);
+ type_register_static(&i2c_slave_type_info);
+}
+
+type_init(i2c_slave_register_types)
projects / qemu.git / blobdiff