* This code is licenced under the LGPL.
*/
-#include "hw.h"
#include "i2c.h"
struct i2c_bus
{
+ BusState qbus;
i2c_slave *current_dev;
i2c_slave *dev;
int saved_address;
}
/* Create a new I2C bus. */
-i2c_bus *i2c_init_bus(void)
+i2c_bus *i2c_init_bus(DeviceState *parent, const char *name)
{
i2c_bus *bus;
- bus = (i2c_bus *)qemu_mallocz(sizeof(i2c_bus));
+ bus = FROM_QBUS(i2c_bus, qbus_create(BUS_TYPE_I2C, sizeof(i2c_bus),
+ parent, name));
register_savevm("i2c_bus", -1, 1, i2c_bus_save, i2c_bus_load, bus);
return bus;
}
-/* Create a new slave device. */
-i2c_slave *i2c_slave_init(i2c_bus *bus, int address, int size)
-{
- i2c_slave *dev;
-
- if (size < sizeof(i2c_slave))
- hw_error("I2C struct too small");
-
- dev = (i2c_slave *)qemu_mallocz(size);
- dev->address = address;
- dev->next = bus->dev;
- bus->dev = dev;
- dev->bus = bus;
-
- return dev;
-}
-
void i2c_set_slave_address(i2c_slave *dev, int address)
{
dev->address = address;
/* TODO: Make this handle multiple masters. */
int i2c_start_transfer(i2c_bus *bus, int address, int recv)
{
- i2c_slave *dev;
+ DeviceState *qdev;
+ i2c_slave *slave = NULL;
- for (dev = bus->dev; dev; dev = dev->next) {
- if (dev->address == address)
+ LIST_FOREACH(qdev, &bus->qbus.children, sibling) {
+ slave = I2C_SLAVE_FROM_QDEV(qdev);
+ if (slave->address == address)
break;
}
- if (!dev)
+ if (!slave)
return 1;
/* If the bus is already busy, assume this is a repeated
start condition. */
- bus->current_dev = dev;
- dev->event(dev, recv ? I2C_START_RECV : I2C_START_SEND);
+ bus->current_dev = slave;
+ slave->info->event(slave, recv ? I2C_START_RECV : I2C_START_SEND);
return 0;
}
if (!dev)
return;
- dev->event(dev, I2C_FINISH);
+ dev->info->event(dev, I2C_FINISH);
bus->current_dev = NULL;
}
if (!dev)
return -1;
- return dev->send(dev, data);
+ return dev->info->send(dev, data);
}
int i2c_recv(i2c_bus *bus)
if (!dev)
return -1;
- return dev->recv(dev);
+ return dev->info->recv(dev);
}
void i2c_nack(i2c_bus *bus)
if (!dev)
return;
- dev->event(dev, I2C_NACK);
+ dev->info->event(dev, I2C_NACK);
}
void i2c_slave_save(QEMUFile *f, i2c_slave *dev)
void i2c_slave_load(QEMUFile *f, i2c_slave *dev)
{
+ i2c_bus *bus;
+ bus = FROM_QBUS(i2c_bus, qdev_get_parent_bus(&dev->qdev));
dev->address = qemu_get_byte(f);
- if (dev->bus->saved_address == dev->address)
- dev->bus->current_dev = dev;
+ if (bus->saved_address == dev->address) {
+ bus->current_dev = dev;
+ }
+}
+
+static void 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;
+ s->address = qdev_get_prop_int(dev, "address", 0);
+
+ info->init(s);
+}
+
+void i2c_register_slave(const char *name, int size, I2CSlaveInfo *info)
+{
+ assert(size >= sizeof(i2c_slave));
+ info->qdev.init = i2c_slave_qdev_init;
+ info->qdev.bus_type = BUS_TYPE_I2C;
+ qdev_register(name, size, &info->qdev);
+}
+
+DeviceState *i2c_create_slave(i2c_bus *bus, const char *name, int addr)
+{
+ DeviceState *dev;
+
+ dev = qdev_create(&bus->qbus, name);
+ qdev_set_prop_int(dev, "address", addr);
+ qdev_init(dev);
+ return dev;
}