diff options
Diffstat (limited to 'hw/i2c.c')
| -rw-r--r-- | hw/i2c.c | 246 |
1 files changed, 0 insertions, 246 deletions
diff --git a/hw/i2c.c b/hw/i2c.c deleted file mode 100644 index 296bece119..0000000000 --- a/hw/i2c.c +++ /dev/null @@ -1,246 +0,0 @@ -/* - * QEMU I2C bus interface. - * - * Copyright (c) 2007 CodeSourcery. - * Written by Paul Brook - * - * This code is licensed under the LGPL. - */ - -#include "i2c.h" - -struct i2c_bus -{ - BusState qbus; - I2CSlave *current_dev; - I2CSlave *dev; - uint8_t saved_address; -}; - -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_pre_save(void *opaque) -{ - i2c_bus *bus = opaque; - - bus->saved_address = bus->current_dev ? bus->current_dev->address : -1; -} - -static int i2c_bus_post_load(void *opaque, int version_id) -{ - 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->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(TYPE_I2C_BUS, parent, name)); - vmstate_register(NULL, -1, &vmstate_i2c_bus, bus); - return bus; -} - -void i2c_set_slave_address(I2CSlave *dev, uint8_t address) -{ - dev->address = address; -} - -/* Return nonzero if bus is busy. */ -int i2c_bus_busy(i2c_bus *bus) -{ - return bus->current_dev != NULL; -} - -/* Returns non-zero if the address is not valid. */ -/* TODO: Make this handle multiple masters. */ -int i2c_start_transfer(i2c_bus *bus, uint8_t address, int recv) -{ - BusChild *kid; - I2CSlave *slave = NULL; - I2CSlaveClass *sc; - - QTAILQ_FOREACH(kid, &bus->qbus.children, sibling) { - DeviceState *qdev = kid->child; - I2CSlave *candidate = I2C_SLAVE_FROM_QDEV(qdev); - if (candidate->address == address) { - slave = candidate; - break; - } - } - - 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; - if (sc->event) { - sc->event(slave, recv ? I2C_START_RECV : I2C_START_SEND); - } - return 0; -} - -void i2c_end_transfer(i2c_bus *bus) -{ - I2CSlave *dev = bus->current_dev; - I2CSlaveClass *sc; - - if (!dev) { - return; - } - - 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) -{ - I2CSlave *dev = bus->current_dev; - I2CSlaveClass *sc; - - if (!dev) { - return -1; - } - - sc = I2C_SLAVE_GET_CLASS(dev); - if (sc->send) { - return sc->send(dev, data); - } - - return -1; -} - -int i2c_recv(i2c_bus *bus) -{ - I2CSlave *dev = bus->current_dev; - I2CSlaveClass *sc; - - if (!dev) { - return -1; - } - - sc = I2C_SLAVE_GET_CLASS(dev); - if (sc->recv) { - return sc->recv(dev); - } - - return -1; -} - -void i2c_nack(i2c_bus *bus) -{ - I2CSlave *dev = bus->current_dev; - I2CSlaveClass *sc; - - if (!dev) { - return; - } - - sc = I2C_SLAVE_GET_CLASS(dev); - if (sc->event) { - sc->event(dev, I2C_NACK); - } -} - -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)); - if (bus->saved_address == dev->address) { - bus->current_dev = dev; - } - return 0; -} - -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() - } -}; - -static int i2c_slave_qdev_init(DeviceState *dev) -{ - I2CSlave *s = I2C_SLAVE_FROM_QDEV(dev); - I2CSlaveClass *sc = I2C_SLAVE_GET_CLASS(s); - - return sc->init(s); -} - -DeviceState *i2c_create_slave(i2c_bus *bus, const char *name, uint8_t addr) -{ - DeviceState *dev; - - dev = qdev_create(&bus->qbus, name); - 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 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) |