cb7210_read
.read = cb7210_read,
return cb7210_read(board, buffer, length, end, bytes_read);
retval = cb7210_read(board, &buffer[*bytes_read], 1, end, &num_bytes);
static int cb7210_read(struct gpib_board *board, u8 *buffer, size_t length,
.read = cb7210_read,
.read = cb7210_read,