linux-kernel - Re: [PATCH v3] create sun sysfs file

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Message-ID: <5016A939.9050600@gmail.com>
Date:	Mon, 30 Jul 2012 23:33:13 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
CC:	lenb@...nel.org, toshi.kani@...com, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] create sun sysfs file

On 07/30/2012 08:58 AM, Yasuaki Ishimatsu wrote:
> Even if a device has _SUN method, there is no way to know the slot unique-ID.
> Thus the patch creates "sun" file in sysfs so that we can recognize it.
> 
> Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
> 
> ---
>  drivers/acpi/scan.c     |   25 +++++++++++++++++++++++++
>  include/acpi/acpi_bus.h |    1 +
>  2 files changed, 26 insertions(+)
> 
> Index: linux-3.5/include/acpi/acpi_bus.h
> ===================================================================
> --- linux-3.5.orig/include/acpi/acpi_bus.h	2012-07-27 10:20:22.722553439 +0900
> +++ linux-3.5/include/acpi/acpi_bus.h	2012-07-27 10:20:25.741555954 +0900
> @@ -209,6 +209,7 @@ 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-3.5/drivers/acpi/scan.c
> ===================================================================
> --- linux-3.5.orig/drivers/acpi/scan.c	2012-07-27 10:20:22.721522499 +0900
> +++ linux-3.5/drivers/acpi/scan.c	2012-07-30 09:52:32.581887304 +0900
> @@ -192,10 +192,21 @@ 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) {
The above line is more than 80 characters.

> +	struct acpi_device *acpi_dev = to_acpi_device(dev);
> +	int result;
> +
> +	result = sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
> +	return result;
How about just
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;
>  
>  	/*
> @@ -217,6 +228,16 @@ 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.
> @@ -241,6 +262,10 @@ 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)
> 
> --
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