acpi_os_read_port
status = acpi_os_read_port((acpi_io_address)reg->address,
status = acpi_os_read_port(address, value, width);
status = acpi_os_read_port(address, &one_byte, 8);
status = acpi_os_read_port(address, (u32 *)val,
status = acpi_os_read_port((acpi_io_address)reg->address,
EXPORT_SYMBOL(acpi_os_read_port);
acpi_os_read_port((acpi_io_address) throttling->status_register.
acpi_os_read_port(reg->address, &val, reg->bit_width);
status = acpi_os_read_port(address, (u32 *)value, bits);
acpi_status acpi_os_read_port(acpi_io_address address, u32 *value, u32 width);