hw/i2c.h

   1 #ifndef QEMU_I2C_H
   2 #define QEMU_I2C_H
   3
   4 #include "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 I2C_SLAVE_FROM_QDEV(dev) DO_UPCAST(I2CSlave, qdev, dev)
  63 #define FROM_I2C_SLAVE(type, dev) DO_UPCAST(type, i2c, dev)
  64
  65 DeviceState *i2c_create_slave(i2c_bus *bus, const char *name, uint8_t addr);
  66
  67 /* wm8750.c */
  68 void wm8750_data_req_set(DeviceState *dev,
  69                 void (*data_req)(void *, int, int), void *opaque);
  70 void wm8750_dac_dat(void *opaque, uint32_t sample);
  71 uint32_t wm8750_adc_dat(void *opaque);
  72 void *wm8750_dac_buffer(void *opaque, int samples);
  73 void wm8750_dac_commit(void *opaque);
  74 void wm8750_set_bclk_in(void *opaque, int new_hz);
  75
  76 /* lm832x.c */
  77 void lm832x_key_event(DeviceState *dev, int key, int state);
  78
  79 extern const VMStateDescription vmstate_i2c_slave;
  80
  81 #define VMSTATE_I2C_SLAVE(_field, _state) {                          \
  82     .name       = (stringify(_field)),                               \
  83     .size       = sizeof(I2CSlave),                                  \
  84     .vmsd       = &vmstate_i2c_slave,                                \
  85     .flags      = VMS_STRUCT,                                        \
  86     .offset     = vmstate_offset_value(_state, _field, I2CSlave),    \
  87 }
  88
  89 #endif