OPAL_I2C_REQUEST

#define OPAL_I2C_REQUEST                     109

/* OPAL I2C request */
struct opal_i2c_request {
             uint8_t type;
#define OPAL_I2C_RAW_READ    0
#define OPAL_I2C_RAW_WRITE   1
#define OPAL_I2C_SM_READ     2
#define OPAL_I2C_SM_WRITE    3
             uint8_t flags;
#define OPAL_I2C_ADDR_10     0x01    /* Not supported yet */
             uint8_t subaddr_sz;             /* Max 4 */
             uint8_t reserved;
             __be16 addr;                    /* 7 or 10 bit address */
             __be16 reserved2;
             __be32 subaddr;         /* Sub-address if any */
             __be32 size;                    /* Data size */
             __be64 buffer_ra;               /* Buffer real address */
};

int opal_i2c_request(uint64_t async_token, uint32_t bus_id,
                     struct opal_i2c_request *oreq);

Initiate I2C request using i2c master that OPAL controls.

Return Codes

Most return codes will come through as part of async completion.

OPAL_PARAMETER
Invalid request pointer, or bus ID.
OPAL_UNSUPPORTED
Unsupported operation. e.g. 10 bit addresses not yet supported.
OPAL_NO_MEM
Not enough free memory in OPAL to initiate request.
OPAL_ASYNC_COMPLETION
Operation will complete asynchronously.
OPAL_I2C_TIMEOUT
I2C operation initiated successfully, but timed out.
OPAL_I2C_INVALID
Invalid i2c Command.
OPAL_I2C_LBUS_PARITY
I2C LBUS Parity error
OPAL_I2C_BKEND_OVERRUN
I2C Backend overrun.
OPAL_I2C_BKEND_ACCESS
I2C Backend Access error.
OPAL_I2C_ARBT_LOST
I2C Bus Arbitration lost.
OPAL_I2C_NACK_RCVD
I2C NACK received.
OPAL_I2C_STOP_ERR
I2C STOP error.
OPAL_SUCCESS
I2C operation completed successfully. Typically only as part of async completion.