IOP3XX_I2C_IO_SIZE
release_mem_region(res->start, IOP3XX_I2C_IO_SIZE);
if (!request_mem_region(res->start, IOP3XX_I2C_IO_SIZE, pdev->name)) {
adapter_data->ioaddr = ioremap(res->start, IOP3XX_I2C_IO_SIZE);
release_mem_region(res->start, IOP3XX_I2C_IO_SIZE);