Re: [PATCH v6] create sun sysfs file

[Rafael J. Wysocki]

On Friday, November 16, 2012 10:43:34 AM Yasuaki Ishimatsu wrote:
> Hi Rafael,
> 
> Please merge this patch into your tree.
> It has been acked by Len.

Applied.

Thanks,
Rafael


> 2012/11/13 16:30, Yasuaki Ishimatsu wrote:
> > Hi Rafael,
> > 
> > The patch was rebased on linux-next. Ant it has been acked by Len:
> > 
> > https://lkml.org/lkml/2012/10/10/65
> > 
> > So please merge it into your tree.
> > 
> > ---
> > _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.
> > 
> > Reviewed-by: Toshi Kani <toshi.kani@xxxxxx>
> > Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx>
> > 
> > ---
> >   Documentation/ABI/testing/sysfs-devices-sun |   14 ++++++++++++++
> >   drivers/acpi/scan.c                         |   24 ++++++++++++++++++++++++
> >   include/acpi/acpi_bus.h                     |    1 +
> >   3 files changed, 39 insertions(+)
> > 
> > Index: linux-next/include/acpi/acpi_bus.h
> > ===================================================================
> > --- linux-next.orig/include/acpi/acpi_bus.h	2012-11-12 17:58:08.000000000 +0900
> > +++ linux-next/include/acpi/acpi_bus.h	2012-11-12 19:07:33.577427071 +0900
> > @@ -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)
> > Index: linux-next/drivers/acpi/scan.c
> > ===================================================================
> > --- linux-next.orig/drivers/acpi/scan.c	2012-11-12 17:57:44.000000000 +0900
> > +++ linux-next/drivers/acpi/scan.c	2012-11-12 19:08:53.387428254 +0900
> > @@ -292,11 +292,21 @@ static ssize_t description_show(struct d
> >   }
> >   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;
> >   
> >   	/*
> > @@ -338,6 +348,16 @@ static int acpi_device_setup_files(struc
> >   	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.
> > @@ -369,6 +389,10 @@ static void acpi_device_remove_files(str
> >   	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)
> > Index: linux-next/Documentation/ABI/testing/sysfs-devices-sun
> > ===================================================================
> > --- /dev/null	1970-01-01 00:00:00.000000000 +0000
> > +++ linux-next/Documentation/ABI/testing/sysfs-devices-sun	2012-11-12 19:09:26.854428750 +0900
> > @@ -0,0 +1,14 @@
> > +Whatt:		/sys/devices/.../sun
> > +Date:		October 2012
> > +Contact:	Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx>
> > +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.
> > 
> > --
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> > 
> 
> 
> 
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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