smbus_io_req_set_read_block_i2c
if (!smbus_io_req_set_read_block_i2c(req->io_smbus, req->io_cmd,
extern bool smbus_io_req_set_read_block_i2c(smbus_io_req_t *, uint8_t, void *,
if (!smbus_io_req_set_read_block_i2c(req, 0x23, buf, sizeof (buf))) {