@@ -14,6 +14,7 @@ struct I2CBus
BusState qbus;
I2CSlave *current_dev;
uint8_t saved_address;
+ bool broadcast;
};
static Property i2c_props[] = {
@@ -55,6 +56,7 @@ static const VMStateDescription vmstate_i2c_bus = {
.post_load = i2c_bus_post_load,
.fields = (VMStateField[]) {
VMSTATE_UINT8(saved_address, I2CBus),
+ VMSTATE_BOOL(broadcast, I2CBus),
VMSTATE_END_OF_LIST()
}
};
@@ -66,6 +68,7 @@ I2CBus *i2c_init_bus(DeviceState *parent, const char *name)
bus = I2C_BUS(qbus_create(TYPE_I2C_BUS, parent, name));
vmstate_register(NULL, -1, &vmstate_i2c_bus, bus);
+
return bus;
}
@@ -88,6 +91,19 @@ int i2c_start_transfer(I2CBus *bus, uint8_t address, int recv)
I2CSlave *slave = NULL;
I2CSlaveClass *sc;
+ if (address == 0x00) {
+ /* This is a broadcast. */
+ bus->broadcast = true;
+ QTAILQ_FOREACH(kid, &bus->qbus.children, sibling) {
+ I2CSlave *dev = I2C_SLAVE(kid->child);
+ sc = I2C_SLAVE_GET_CLASS(dev);
+ if (sc->event) {
+ sc->event(dev, recv ? I2C_START_RECV : I2C_START_SEND);
+ }
+ }
+ return 0;
+ }
+
QTAILQ_FOREACH(kid, &bus->qbus.children, sibling) {
DeviceState *qdev = kid->child;
I2CSlave *candidate = I2C_SLAVE(qdev);
@@ -113,9 +129,22 @@ int i2c_start_transfer(I2CBus *bus, uint8_t address, int recv)
void i2c_end_transfer(I2CBus *bus)
{
+ BusChild *kid;
I2CSlave *dev = bus->current_dev;
I2CSlaveClass *sc;
+ if (bus->broadcast) {
+ QTAILQ_FOREACH(kid, &bus->qbus.children, sibling) {
+ I2CSlave *dev = I2C_SLAVE(kid->child);
+ sc = I2C_SLAVE_GET_CLASS(dev);
+ if (sc->event) {
+ sc->event(dev, I2C_FINISH);
+ }
+ }
+ bus->broadcast = false;
+ return;
+ }
+
if (!dev) {
return;
}
@@ -130,8 +159,22 @@ void i2c_end_transfer(I2CBus *bus)
int i2c_send(I2CBus *bus, uint8_t data)
{
+ BusChild *kid;
I2CSlave *dev = bus->current_dev;
I2CSlaveClass *sc;
+ int ret = 0;
+
+ if (bus->broadcast) {
+ QTAILQ_FOREACH(kid, &bus->qbus.children, sibling) {
+ I2CSlave *dev = I2C_SLAVE(kid->child);
+ sc = I2C_SLAVE_GET_CLASS(dev);
+ bus->broadcast = true;
+ if (sc->send) {
+ ret |= sc->send(dev, data);
+ }
+ }
+ return ret;
+ }
if (!dev) {
return -1;
@@ -150,7 +193,7 @@ int i2c_recv(I2CBus *bus)
I2CSlave *dev = bus->current_dev;
I2CSlaveClass *sc;
- if (!dev) {
+ if ((!dev) || (bus->broadcast)) {
return -1;
}