2  * QEMU I2C bus interface.
33     I2CBus *bus = opaque;  in i2c_bus_pre_save()  local
35     bus->saved_address = -1;  in i2c_bus_pre_save()
36     if (!QLIST_EMPTY(&bus->current_devs)) {  in i2c_bus_pre_save()
37         if (!bus->broadcast) {  in i2c_bus_pre_save()
38             bus->saved_address = QLIST_FIRST(&bus->current_devs)->elt->address;  in i2c_bus_pre_save()
40             bus->saved_address = I2C_BROADCAST;  in i2c_bus_pre_save()
58 /* Create a new I2C bus.  */
61     I2CBus *bus;  in i2c_init_bus()  local
63     bus = I2C_BUS(qbus_new(TYPE_I2C_BUS, parent, name));  in i2c_init_bus()
64     QLIST_INIT(&bus->current_devs);  in i2c_init_bus()
65     QSIMPLEQ_INIT(&bus->pending_masters);  in i2c_init_bus()
66     vmstate_register_any(NULL, &vmstate_i2c_bus, bus);  in i2c_init_bus()
67     return bus;  in i2c_init_bus()
75 /* Return nonzero if bus is busy.  */
76 int i2c_bus_busy(I2CBus *bus)  in i2c_bus_busy()  argument
78     return !QLIST_EMPTY(&bus->current_devs) || bus->bh;  in i2c_bus_busy()
81 bool i2c_scan_bus(I2CBus *bus, uint8_t address, bool broadcast,  in i2c_scan_bus()  argument
86     QTAILQ_FOREACH(kid, &bus->qbus.children, sibling) {  in i2c_scan_bus()
109  * the bus transaction is terminated (or really never started).  If
116  * without releasing the bus.  If that fails, the bus is still
121 static int i2c_do_start_transfer(I2CBus *bus, uint8_t address,  in i2c_do_start_transfer()  argument
131          * bus.  in i2c_do_start_transfer()
133         bus->broadcast = true;  in i2c_do_start_transfer()
138      * the middle of a transaction and we shouldn't rescan the bus.  in i2c_do_start_transfer()
144     if (QLIST_EMPTY(&bus->current_devs)) {  in i2c_do_start_transfer()
146         (void)i2c_scan_bus(bus, address, bus->broadcast, &bus->current_devs);  in i2c_do_start_transfer()
150     if (QLIST_EMPTY(&bus->current_devs)) {  in i2c_do_start_transfer()
154     QLIST_FOREACH(node, &bus->current_devs, next) {  in i2c_do_start_transfer()
159         /* If the bus is already busy, assume this is a repeated  in i2c_do_start_transfer()
166             if (rv && !bus->broadcast) {  in i2c_do_start_transfer()
169                     i2c_end_transfer(bus);  in i2c_do_start_transfer()
178 int i2c_start_transfer(I2CBus *bus, uint8_t address, bool is_recv)  in i2c_start_transfer()  argument
180     return i2c_do_start_transfer(bus, address, is_recv  in i2c_start_transfer()
185 void i2c_bus_master(I2CBus *bus, QEMUBH *bh)  in i2c_bus_master()  argument
190     QSIMPLEQ_INSERT_TAIL(&bus->pending_masters, node, entry);  in i2c_bus_master()
193 void i2c_schedule_pending_master(I2CBus *bus)  in i2c_schedule_pending_master()  argument
197     if (i2c_bus_busy(bus)) {  in i2c_schedule_pending_master()
198         /* someone is already controlling the bus; wait for it to release it */  in i2c_schedule_pending_master()
202     if (QSIMPLEQ_EMPTY(&bus->pending_masters)) {  in i2c_schedule_pending_master()
206     node = QSIMPLEQ_FIRST(&bus->pending_masters);  in i2c_schedule_pending_master()
207     bus->bh = node->bh;  in i2c_schedule_pending_master()
209     QSIMPLEQ_REMOVE_HEAD(&bus->pending_masters, entry);  in i2c_schedule_pending_master()
212     qemu_bh_schedule(bus->bh);  in i2c_schedule_pending_master()
215 void i2c_bus_release(I2CBus *bus)  in i2c_bus_release()  argument
217     bus->bh = NULL;  in i2c_bus_release()
219     i2c_schedule_pending_master(bus);  in i2c_bus_release()
222 int i2c_start_recv(I2CBus *bus, uint8_t address)  in i2c_start_recv()  argument
224     return i2c_do_start_transfer(bus, address, I2C_START_RECV);  in i2c_start_recv()
227 int i2c_start_send(I2CBus *bus, uint8_t address)  in i2c_start_send()  argument
229     return i2c_do_start_transfer(bus, address, I2C_START_SEND);  in i2c_start_send()
232 int i2c_start_send_async(I2CBus *bus, uint8_t address)  in i2c_start_send_async()  argument
234     return i2c_do_start_transfer(bus, address, I2C_START_SEND_ASYNC);  in i2c_start_send_async()
237 void i2c_end_transfer(I2CBus *bus)  in i2c_end_transfer()  argument
242     QLIST_FOREACH_SAFE(node, &bus->current_devs, next, next) {  in i2c_end_transfer()
252     bus->broadcast = false;  in i2c_end_transfer()
255 int i2c_send(I2CBus *bus, uint8_t data)  in i2c_send()  argument
262     QLIST_FOREACH(node, &bus->current_devs, next) {  in i2c_send()
276 int i2c_send_async(I2CBus *bus, uint8_t data)  in i2c_send_async()  argument
278     I2CNode *node = QLIST_FIRST(&bus->current_devs);  in i2c_send_async()
293 uint8_t i2c_recv(I2CBus *bus)  in i2c_recv()  argument
299     if (!QLIST_EMPTY(&bus->current_devs) && !bus->broadcast) {  in i2c_recv()
300         sc = I2C_SLAVE_GET_CLASS(QLIST_FIRST(&bus->current_devs)->elt);  in i2c_recv()
302             s = QLIST_FIRST(&bus->current_devs)->elt;  in i2c_recv()
311 void i2c_nack(I2CBus *bus)  in i2c_nack()  argument
316     if (QLIST_EMPTY(&bus->current_devs)) {  in i2c_nack()
320     QLIST_FOREACH(node, &bus->current_devs, next) {  in i2c_nack()
329 void i2c_ack(I2CBus *bus)  in i2c_ack()  argument
331     if (!bus->bh) {  in i2c_ack()
337     qemu_bh_schedule(bus->bh);  in i2c_ack()
343     I2CBus *bus;  in i2c_slave_post_load()  local
346     bus = I2C_BUS(qdev_get_parent_bus(DEVICE(dev)));  in i2c_slave_post_load()
347     if ((bus->saved_address == dev->address) ||  in i2c_slave_post_load()
348         (bus->saved_address == I2C_BROADCAST)) {  in i2c_slave_post_load()
351         QLIST_INSERT_HEAD(&bus->current_devs, node, next);  in i2c_slave_post_load()
376 bool i2c_slave_realize_and_unref(I2CSlave *dev, I2CBus *bus, Error **errp)  in i2c_slave_realize_and_unref()  argument
378     return qdev_realize_and_unref(&dev->qdev, &bus->qbus, errp);  in i2c_slave_realize_and_unref()
381 I2CSlave *i2c_slave_create_simple(I2CBus *bus, const char *name, uint8_t addr)  in i2c_slave_create_simple()  argument
385     i2c_slave_realize_and_unref(dev, bus, &error_abort);  in i2c_slave_create_simple()