Hi Rafael, Please merge this patch into your tree. It has been acked by Len. Thanks, Yasuaki Ishimatsu 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. > > -- > To unsubscribe from this list: send the line "unsubscribe linux-acpi" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
