Unlocked flavor of i2c_transfer
int __i2c_transfer(struct i2c_adapter * adap, struct i2c_msg * msgs, int num);
adap
Handle to I2C bus
msgs
One or more messages to execute before STOP is issued to terminate the operation; each message begins with a START.
num
Number of messages to be executed.
Returns negative errno, else the number of messages executed.
Adapter lock must be held when calling this function. No debug logging takes place. adap->algo->master_xfer existence isn't checked.