1 #ifndef QEMU_I2C_H 2 #define QEMU_I2C_H 3 4 #include "hw/qdev.h" 5 6 /* The QEMU I2C implementation only supports simple transfers that complete 7 immediately. It does not support slave devices that need to be able to 8 defer their response (eg. CPU slave interfaces where the data is supplied 9 by the device driver in response to an interrupt). */ 10 11 enum i2c_event { 12 I2C_START_RECV, 13 I2C_START_SEND, 14 I2C_FINISH, 15 I2C_NACK /* Masker NACKed a receive byte. */ 16 }; 17 18 typedef struct I2CSlave I2CSlave; 19 20 #define TYPE_I2C_SLAVE "i2c-slave" 21 #define I2C_SLAVE(obj) \ 22 OBJECT_CHECK(I2CSlave, (obj), TYPE_I2C_SLAVE) 23 #define I2C_SLAVE_CLASS(klass) \ 24 OBJECT_CLASS_CHECK(I2CSlaveClass, (klass), TYPE_I2C_SLAVE) 25 #define I2C_SLAVE_GET_CLASS(obj) \ 26 OBJECT_GET_CLASS(I2CSlaveClass, (obj), TYPE_I2C_SLAVE) 27 28 typedef struct I2CSlaveClass 29 { 30 DeviceClass parent_class; 31 32 /* Callbacks provided by the device. */ 33 int (*init)(I2CSlave *dev); 34 35 /* Master to slave. */ 36 int (*send)(I2CSlave *s, uint8_t data); 37 38 /* Slave to master. */ 39 int (*recv)(I2CSlave *s); 40 41 /* Notify the slave of a bus state change. */ 42 void (*event)(I2CSlave *s, enum i2c_event event); 43 } I2CSlaveClass; 44 45 struct I2CSlave 46 { 47 DeviceState qdev; 48 49 /* Remaining fields for internal use by the I2C code. */ 50 uint8_t address; 51 }; 52 53 i2c_bus *i2c_init_bus(DeviceState *parent, const char *name); 54 void i2c_set_slave_address(I2CSlave *dev, uint8_t address); 55 int i2c_bus_busy(i2c_bus *bus); 56 int i2c_start_transfer(i2c_bus *bus, uint8_t address, int recv); 57 void i2c_end_transfer(i2c_bus *bus); 58 void i2c_nack(i2c_bus *bus); 59 int i2c_send(i2c_bus *bus, uint8_t data); 60 int i2c_recv(i2c_bus *bus); 61 62 #define FROM_I2C_SLAVE(type, dev) DO_UPCAST(type, i2c, dev) 63 64 DeviceState *i2c_create_slave(i2c_bus *bus, const char *name, uint8_t addr); 65 66 /* wm8750.c */ 67 void wm8750_data_req_set(DeviceState *dev, 68 void (*data_req)(void *, int, int), void *opaque); 69 void wm8750_dac_dat(void *opaque, uint32_t sample); 70 uint32_t wm8750_adc_dat(void *opaque); 71 void *wm8750_dac_buffer(void *opaque, int samples); 72 void wm8750_dac_commit(void *opaque); 73 void wm8750_set_bclk_in(void *opaque, int new_hz); 74 75 /* lm832x.c */ 76 void lm832x_key_event(DeviceState *dev, int key, int state); 77 78 extern const VMStateDescription vmstate_i2c_slave; 79 80 #define VMSTATE_I2C_SLAVE(_field, _state) { \ 81 .name = (stringify(_field)), \ 82 .size = sizeof(I2CSlave), \ 83 .vmsd = &vmstate_i2c_slave, \ 84 .flags = VMS_STRUCT, \ 85 .offset = vmstate_offset_value(_state, _field, I2CSlave), \ 86 } 87 88 #endif 89