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| author |   Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> | 2019-05-01 07:53:22 -0500 |
|---|---|---|
| committer |   Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-05-10 12:30:45 +0200 |
| commit | ca6f998cf9a259fe6019d44768064e0cfe8a925b (patch) | |
| tree | 956a64b8a0a45df417253c67c8fa902913cd7f5a /drivers/acpi | |
| parent | Merge tag 'acpi-5.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm (diff) | |
| download | linux-dev-ca6f998cf9a259fe6019d44768064e0cfe8a925b.tar.xz linux-dev-ca6f998cf9a259fe6019d44768064e0cfe8a925b.zip | |
ACPI: bus: change _ADR representation to 64 bits
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@linux.intel.com>
[ rjw: Replace 0xFFFFFFFF with U32_MAX, clean up subject ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/device_sysfs.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/acpi/device_sysfs.c b/drivers/acpi/device_sysfs.c index 8940054d6250..78c2653bf020 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 > U32_MAX) + 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); |