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Diffstat (limited to 'include/hw/i2c/i2c.h')
-rw-r--r-- | include/hw/i2c/i2c.h | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/include/hw/i2c/i2c.h b/include/hw/i2c/i2c.h new file mode 100644 index 0000000..461392f --- /dev/null +++ b/include/hw/i2c/i2c.h @@ -0,0 +1,88 @@ +#ifndef QEMU_I2C_H +#define QEMU_I2C_H + +#include "hw/qdev.h" + +/* The QEMU I2C implementation only supports simple transfers that complete + immediately. It does not support slave devices that need to be able to + defer their response (eg. CPU slave interfaces where the data is supplied + by the device driver in response to an interrupt). */ + +enum i2c_event { + I2C_START_RECV, + I2C_START_SEND, + I2C_FINISH, + I2C_NACK /* Masker NACKed a receive byte. */ +}; + +typedef struct I2CSlave I2CSlave; + +#define TYPE_I2C_SLAVE "i2c-slave" +#define I2C_SLAVE(obj) \ + OBJECT_CHECK(I2CSlave, (obj), TYPE_I2C_SLAVE) +#define I2C_SLAVE_CLASS(klass) \ + OBJECT_CLASS_CHECK(I2CSlaveClass, (klass), TYPE_I2C_SLAVE) +#define I2C_SLAVE_GET_CLASS(obj) \ + OBJECT_GET_CLASS(I2CSlaveClass, (obj), TYPE_I2C_SLAVE) + +typedef struct I2CSlaveClass +{ + DeviceClass parent_class; + + /* Callbacks provided by the device. */ + int (*init)(I2CSlave *dev); + + /* Master to slave. */ + int (*send)(I2CSlave *s, uint8_t data); + + /* Slave to master. */ + int (*recv)(I2CSlave *s); + + /* Notify the slave of a bus state change. */ + void (*event)(I2CSlave *s, enum i2c_event event); +} I2CSlaveClass; + +struct I2CSlave +{ + DeviceState qdev; + + /* Remaining fields for internal use by the I2C code. */ + uint8_t address; +}; + +i2c_bus *i2c_init_bus(DeviceState *parent, const char *name); +void i2c_set_slave_address(I2CSlave *dev, uint8_t address); +int i2c_bus_busy(i2c_bus *bus); +int i2c_start_transfer(i2c_bus *bus, uint8_t address, int recv); +void i2c_end_transfer(i2c_bus *bus); +void i2c_nack(i2c_bus *bus); +int i2c_send(i2c_bus *bus, uint8_t data); +int i2c_recv(i2c_bus *bus); + +#define FROM_I2C_SLAVE(type, dev) DO_UPCAST(type, i2c, dev) + +DeviceState *i2c_create_slave(i2c_bus *bus, const char *name, uint8_t addr); + +/* wm8750.c */ +void wm8750_data_req_set(DeviceState *dev, + void (*data_req)(void *, int, int), void *opaque); +void wm8750_dac_dat(void *opaque, uint32_t sample); +uint32_t wm8750_adc_dat(void *opaque); +void *wm8750_dac_buffer(void *opaque, int samples); +void wm8750_dac_commit(void *opaque); +void wm8750_set_bclk_in(void *opaque, int new_hz); + +/* lm832x.c */ +void lm832x_key_event(DeviceState *dev, int key, int state); + +extern const VMStateDescription vmstate_i2c_slave; + +#define VMSTATE_I2C_SLAVE(_field, _state) { \ + .name = (stringify(_field)), \ + .size = sizeof(I2CSlave), \ + .vmsd = &vmstate_i2c_slave, \ + .flags = VMS_STRUCT, \ + .offset = vmstate_offset_value(_state, _field, I2CSlave), \ +} + +#endif |