linux-kernel - Re: [PATCH v5] create sun sysfs file

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Date:	Wed, 10 Oct 2012 17:31:28 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	<linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<lenb@...nel.org>
CC:	<toshi.kani@...com>, <liuj97@...il.com>
Subject: Re: [PATCH v5] create sun sysfs file

Hi Len,

How about v5 patch? 

Thanks,
Yasuaki Ishimatsu

2012/10/09 15:49, Yasuaki Ishimatsu wrote:
> _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@...com>
> Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
> 
> ---
>   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-3.6/include/acpi/acpi_bus.h
> ===================================================================
> --- linux-3.6.orig/include/acpi/acpi_bus.h	2012-10-09 11:54:17.690072343 +0900
> +++ linux-3.6/include/acpi/acpi_bus.h	2012-10-09 14:15:49.207794671 +0900
> @@ -208,6 +208,7 @@ struct acpi_device_pnp {
>   	struct list_head ids;		/* _HID and _CIDs */
>   	acpi_device_name device_name;	/* Driver-determined */
>   	acpi_device_class device_class;	/*        "          */
> +	unsigned long sun;		/* _SUN */
>   };
>   
>   #define acpi_device_bid(d)	((d)->pnp.bus_id)
> Index: linux-3.6/drivers/acpi/scan.c
> ===================================================================
> --- linux-3.6.orig/drivers/acpi/scan.c	2012-10-09 11:54:17.688072343 +0900
> +++ linux-3.6/drivers/acpi/scan.c	2012-10-09 14:15:49.211794675 +0900
> @@ -232,10 +232,20 @@ end:
>   }
>   static DEVICE_ATTR(path, 0444, acpi_device_path_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)
>   {
>   	acpi_status status;
>   	acpi_handle temp;
> +	unsigned long long sun;
>   	int result = 0;
>   
>   	/*
> @@ -257,6 +267,16 @@ static int acpi_device_setup_files(struc
>   			goto end;
>   	}
>   
> +	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.
> @@ -281,6 +301,10 @@ 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);
> +
>   	device_remove_file(&dev->dev, &dev_attr_modalias);
>   	device_remove_file(&dev->dev, &dev_attr_hid);
>   	if (dev->handle)
> Index: linux-3.6/Documentation/ABI/testing/sysfs-devices-sun
> ===================================================================
> --- /dev/null	1970-01-01 00:00:00.000000000 +0000
> +++ linux-3.6/Documentation/ABI/testing/sysfs-devices-sun	2012-10-09 15:47:02.333245246 +0900
> @@ -0,0 +1,14 @@
> +Whatt:		/sys/devices/.../sun
> +Date:		October 2012
> +Contact:	Yasuaki Ishimatsu <isimatu.yasuaki@...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.
> 
> --
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> 


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