ACPI: create _SUN sysfs file
_SUN method provides the slot unique-ID in the ACPI namespace. And The value
is written in Advanced Configuration and Power Interface Specification as
follows:
"The _SUN value is required to be unique among the slots ofthe same type.
It is also recommended that this number match the slot number printed on
the physical slot whenever possible."
So if we can know the value, we can identify the physical position of the
slot in the system.
The patch creates "sun" file in sysfs for identifying physical position
of the slot.
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Reviewed-by: Toshi Kani <toshi.kani@hp.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 9d43532..d0b38ab 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -283,11 +283,21 @@
}
static DEVICE_ATTR(description, 0444, description_show, NULL);
+static ssize_t
+acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
+ char *buf) {
+ struct acpi_device *acpi_dev = to_acpi_device(dev);
+
+ return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
+}
+static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
+
static int acpi_device_setup_files(struct acpi_device *dev)
{
struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
acpi_status status;
acpi_handle temp;
+ unsigned long long sun;
int result = 0;
/*
@@ -329,6 +339,16 @@
if (dev->pnp.unique_id)
result = device_create_file(&dev->dev, &dev_attr_uid);
+ status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
+ if (ACPI_SUCCESS(status)) {
+ dev->pnp.sun = (unsigned long)sun;
+ result = device_create_file(&dev->dev, &dev_attr_sun);
+ if (result)
+ goto end;
+ } else {
+ dev->pnp.sun = (unsigned long)-1;
+ }
+
/*
* If device has _EJ0, 'eject' file is created that is used to trigger
* hot-removal function from userland.
@@ -360,6 +380,10 @@
if (ACPI_SUCCESS(status))
device_remove_file(&dev->dev, &dev_attr_eject);
+ status = acpi_get_handle(dev->handle, "_SUN", &temp);
+ if (ACPI_SUCCESS(status))
+ device_remove_file(&dev->dev, &dev_attr_sun);
+
if (dev->pnp.unique_id)
device_remove_file(&dev->dev, &dev_attr_uid);
if (dev->flags.bus_address)