diff options
Diffstat (limited to 'hw/smbus.h')
| -rw-r--r-- | hw/smbus.h | 46 |
1 files changed, 39 insertions, 7 deletions
diff --git a/hw/smbus.h b/hw/smbus.h index 76fc3c839..9125896cc 100644 --- a/hw/smbus.h +++ b/hw/smbus.h @@ -25,14 +25,46 @@ typedef struct SMBusDevice SMBusDevice; struct SMBusDevice { - uint8_t addr; + /* The SMBus protocol is implemented on top of I2C. */ + i2c_slave i2c; + + /* Callbacks set by the device. */ void (*quick_cmd)(SMBusDevice *dev, uint8_t read); void (*send_byte)(SMBusDevice *dev, uint8_t val); uint8_t (*receive_byte)(SMBusDevice *dev); - void (*write_byte)(SMBusDevice *dev, uint8_t cmd, uint8_t val); - uint8_t (*read_byte)(SMBusDevice *dev, uint8_t cmd); - void (*write_word)(SMBusDevice *dev, uint8_t cmd, uint16_t val); - uint16_t (*read_word)(SMBusDevice *dev, uint8_t cmd); - void (*write_block)(SMBusDevice *dev, uint8_t cmd, uint8_t len, uint8_t *buf); - uint8_t (*read_block)(SMBusDevice *dev, uint8_t cmd, uint8_t *buf); + /* We can't distinguish between a word write and a block write with + length 1, so pass the whole data block including the length byte + (if present). The device is responsible figuring out what type of + command this is. */ + void (*write_data)(SMBusDevice *dev, uint8_t cmd, uint8_t *buf, int len); + /* Likewise we can't distinguish between defferent reads, or even know + the length of the read until the read is complete, so read data a + byte at a time. The device is responsible for adding the length + byte on block reads. */ + uint8_t (*read_data)(SMBusDevice *dev, uint8_t cmd, int n); + + /* Remaining fields for internal use only. */ + int mode; + int data_len; + uint8_t data_buf[34]; /* command + len + 32 bytes of data. */ + uint8_t command; }; + +/* Create a slave device. */ +SMBusDevice *smbus_device_init(i2c_bus *bus, int address, int size); + +/* Master device commands. */ +void smbus_quick_command(i2c_bus *bus, int addr, int read); +uint8_t smbus_receive_byte(i2c_bus *bus, int addr); +void smbus_send_byte(i2c_bus *bus, int addr, uint8_t data); +uint8_t smbus_read_byte(i2c_bus *bus, int addr, uint8_t command); +void smbus_write_byte(i2c_bus *bus, int addr, uint8_t command, uint8_t data); +uint16_t smbus_read_word(i2c_bus *bus, int addr, uint8_t command); +void smbus_write_word(i2c_bus *bus, int addr, uint8_t command, uint16_t data); +int smbus_read_block(i2c_bus *bus, int addr, uint8_t command, uint8_t *data); +void smbus_write_block(i2c_bus *bus, int addr, uint8_t command, uint8_t *data, + int len); + +/* smbus_eeprom.c */ +void smbus_eeprom_device_init(i2c_bus *bus, uint8_t addr, uint8_t *buf); + |