50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
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#ifndef QEMU_I2C_H
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#define QEMU_I2C_H
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/* The QEMU I2C implementation only supports simple transfers that complete
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immediately. It does not support slave devices that need to be able to
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defer their response (eg. CPU slave interfaces where the data is supplied
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by the device driver in response to an interrupt). */
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enum i2c_event {
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I2C_START_RECV,
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I2C_START_SEND,
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I2C_FINISH,
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I2C_NACK /* Masker NACKed a recieve byte. */
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};
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typedef struct i2c_slave i2c_slave;
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/* Master to slave. */
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typedef int (*i2c_send_cb)(i2c_slave *s, uint8_t data);
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/* Slave to master. */
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typedef int (*i2c_recv_cb)(i2c_slave *s);
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/* Notify the slave of a bus state change. */
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typedef void (*i2c_event_cb)(i2c_slave *s, enum i2c_event event);
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struct i2c_slave
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{
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/* Callbacks to be set by the device. */
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i2c_event_cb event;
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i2c_recv_cb recv;
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i2c_send_cb send;
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/* Remaining fields for internal use by the I2C code. */
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int address;
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void *next;
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};
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typedef struct i2c_bus i2c_bus;
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i2c_bus *i2c_init_bus(void);
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i2c_slave *i2c_slave_init(i2c_bus *bus, int address, int size);
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void i2c_set_slave_address(i2c_slave *dev, int address);
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int i2c_bus_busy(i2c_bus *bus);
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int i2c_start_transfer(i2c_bus *bus, int address, int recv);
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void i2c_end_transfer(i2c_bus *bus);
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void i2c_nack(i2c_bus *bus);
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int i2c_send(i2c_bus *bus, uint8_t data);
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int i2c_recv(i2c_bus *bus);
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#endif
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