xfer_begin 303 drivers/i2c/algos/i2c-algo-pcf.c if (adap->xfer_begin) xfer_begin 304 drivers/i2c/algos/i2c-algo-pcf.c adap->xfer_begin(adap->data); xfer_begin 25 include/linux/i2c-algo-pcf.h void (*xfer_begin) (void *data);