On 01-05-19, 07:53, Pierre-Louis Bossart wrote:
> 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: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
> ---
> v2: only use 64 bits when required to avoid compatibility issues
> (feedback from Vinod and Rafael)
>
> drivers/acpi/device_sysfs.c | 6 ++++--
> include/acpi/acpi_bus.h | 2 +-
> 2 files changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/acpi/device_sysfs.c b/drivers/acpi/device_sysfs.c
> index 8940054d6250..7dda0ee05cd1 100644
> --- a/drivers/acpi/device_sysfs.c
> +++ b/drivers/acpi/device_sysfs.c
> @@ -428,8 +428,10 @@ static ssize_t acpi_device_adr_show(struct device *dev,
> {
> struct acpi_device *acpi_dev = to_acpi_device(dev);
>
> - return sprintf(buf, "0x%08x\n",
> - (unsigned int)(acpi_dev->pnp.bus_address));
> + if (acpi_dev->pnp.bus_address > 0xFFFFFFFF)
Would prefer to use U32_MAX instead of 0xFFFFFFFF
> + return sprintf(buf, "0x%016llx\n", acpi_dev->pnp.bus_address);
> + else
> + return sprintf(buf, "0x%08llx\n", acpi_dev->pnp.bus_address);
> }
> static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
>
> diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
> index f7981751ac77..9075e28ea60a 100644
> --- a/include/acpi/acpi_bus.h
> +++ b/include/acpi/acpi_bus.h
> @@ -230,7 +230,7 @@ struct acpi_device_dir {
> /* Plug and Play */
>
> typedef char acpi_bus_id[8];
> -typedef unsigned long acpi_bus_address;
> +typedef u64 acpi_bus_address;
> typedef char acpi_device_name[40];
> typedef char acpi_device_class[20];
>
> --
> 2.17.1
--
~Vinod
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