• Pierre-Louis Bossart's avatar
    ACPI: bus: change _ADR representation to 64 bits · ca6f998c
    Pierre-Louis Bossart authored
    Standards such as the MIPI DisCo for SoundWire 1.0 specification
    assume the _ADR field is 64 bits.
    
    _ADR is defined as an "Integer" represented as 64 bits since ACPI 2.0
    released in 2002. The low levels already use _ADR as 64 bits, e.g. in
    struct acpi_device_info.
    
    This patch bumps the representation used for sysfs to 64 bits. To
    avoid any compatibility/ABI issues, the printf format is only extended
    to 16 characters when the actual _ADR value exceeds the 32 bit
    maximum.
    
    Example with a SoundWire device, the results show the complete
    vendorID and linkID which were omitted before:
    
    Before:
    $ more /sys/bus/acpi/devices/device\:38/adr
    0x5d070000
    After:
    $ more /sys/bus/acpi/devices/device\:38/adr
    0x000010025d070000
    Signed-off-by: default avatarPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
    [ rjw: Replace 0xFFFFFFFF with U32_MAX, clean up subject ]
    Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
    ca6f998c
acpi_bus.h 19.2 KB