Commit bb74ac23 authored by Yasuaki Ishimatsu's avatar Yasuaki Ishimatsu Committed by Rafael J. Wysocki
Browse files

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: default avatarYasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Reviewed-by: default avatarToshi Kani <toshi.kani@hp.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 61d8eff1

Documentation/ABI/testing/sysfs-devices-sun

0 → 100644
+14 −0
Original line number Diff line number Diff line 
Whatt:		/sys/devices/.../sun

Date:		October 2012

Contact:	Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>

Description:

		The file contains a Slot-unique ID which provided by the _SUN

		method in the ACPI namespace. The value is written in Advanced

		Configuration and Power Interface Specification as follows:



		"The _SUN value is required to be unique among the slots of

		the same type. It is also recommended that this number match

		the slot number printed on the physical slot whenever possible."



		So reading the sysfs file, we can identify a physical position

		of the slot in the system.

drivers/acpi/scan.c

+24 −0
Original line number Diff line number Diff line
@@ -283,11 +283,21 @@ static ssize_t description_show(struct device *dev, 
}

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 @@ static int acpi_device_setup_files(struct acpi_device *dev) 
	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 @@ static void acpi_device_remove_files(struct acpi_device *dev) 
	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)

include/acpi/acpi_bus.h

+1 −0
Original line number Diff line number Diff line
@@ -179,6 +179,7 @@ struct acpi_device_pnp { 
	acpi_device_name device_name;	/* Driver-determined */

	acpi_device_class device_class;	/*        "          */

	union acpi_object *str_obj;	/* unicode string for _STR method */

	unsigned long sun;		/* _SUN */

};



#define acpi_device_bid(d)	((d)->pnp.bus_id)

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