LXR qemu/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
  11enum i2c_event {
  12    I2C_START_RECV,
  13    I2C_START_SEND,
  14    I2C_FINISH,
  15    I2C_NACK /* Masker NACKed a receive byte.  */
  16};
  17
  18/* Master to slave.  */
  19typedef int (*i2c_send_cb)(i2c_slave *s, uint8_t data);
  20/* Slave to master.  */
  21typedef int (*i2c_recv_cb)(i2c_slave *s);
  22/* Notify the slave of a bus state change.  */
  23typedef void (*i2c_event_cb)(i2c_slave *s, enum i2c_event event);
  24
  25typedef int (*i2c_slave_initfn)(i2c_slave *dev);
  26
  27typedef struct {
  28    DeviceInfo qdev;
  29
  30    /* Callbacks provided by the device.  */
  31    i2c_slave_initfn init;
  32    i2c_event_cb event;
  33    i2c_recv_cb recv;
  34    i2c_send_cb send;
  35} I2CSlaveInfo;
  36
  37struct i2c_slave
  38{
  39    DeviceState qdev;
  40    I2CSlaveInfo *info;
  41
  42    /* Remaining fields for internal use by the I2C code.  */
  43    uint8_t address;
  44};
  45
  46i2c_bus *i2c_init_bus(DeviceState *parent, const char *name);
  47void i2c_set_slave_address(i2c_slave *dev, uint8_t address);
  48int i2c_bus_busy(i2c_bus *bus);
  49int i2c_start_transfer(i2c_bus *bus, uint8_t address, int recv);
  50void i2c_end_transfer(i2c_bus *bus);
  51void i2c_nack(i2c_bus *bus);
  52int i2c_send(i2c_bus *bus, uint8_t data);
  53int i2c_recv(i2c_bus *bus);
  54
  55#define I2C_SLAVE_FROM_QDEV(dev) DO_UPCAST(i2c_slave, qdev, dev)
  56#define FROM_I2C_SLAVE(type, dev) DO_UPCAST(type, i2c, dev)
  57
  58void i2c_register_slave(I2CSlaveInfo *type);
  59
  60DeviceState *i2c_create_slave(i2c_bus *bus, const char *name, uint8_t addr);
  61
  62/* max7310.c */
  63void max7310_reset(i2c_slave *i2c);
  64qemu_irq *max7310_gpio_in_get(i2c_slave *i2c);
  65void max7310_gpio_out_set(i2c_slave *i2c, int line, qemu_irq handler);
  66
  67/* wm8750.c */
  68void wm8750_data_req_set(DeviceState *dev,
  69                void (*data_req)(void *, int, int), void *opaque);
  70void wm8750_dac_dat(void *opaque, uint32_t sample);
  71uint32_t wm8750_adc_dat(void *opaque);
  72void *wm8750_dac_buffer(void *opaque, int samples);
  73void wm8750_dac_commit(void *opaque);
  74void wm8750_set_bclk_in(void *opaque, int new_hz);
  75
  76/* tmp105.c */
  77void tmp105_set(i2c_slave *i2c, int temp);
  78
  79/* lm832x.c */
  80void lm832x_key_event(i2c_slave *i2c, int key, int state);
  81
  82#endif
  83