linux-kernel - Re: [PATCH 1/2] hwmon, fam15h_power: Make actual power reporting conditional

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Date:	Tue, 16 Sep 2014 08:52:21 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>
Cc:	herrmann.der.user@...glemail.com, jdelvare@...e.de,
	lm-sensors@...sensors.org, linux-kernel@...r.kernel.org,
	boris.ostrovsky@...cle.com
Subject: Re: [PATCH 1/2] hwmon, fam15h_power: Make actual power reporting
 conditional

On Tue, Sep 16, 2014 at 10:38:38AM -0500, Aravind Gopalakrishnan wrote:
> power1_input should only be reported for Fam15h, Models 00h-0fh
> So, introduce a is_visible function to take care of this.
> 
> As suggested by Guenter here:
> http://marc.info/?l=linux-kernel&m=141038145616437&w=2
> 
> Suggested-by: Guenter Roeck <linux@...ck-us.net>
> Signed-off-by: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>
> ---
>  drivers/hwmon/fam15h_power.c | 19 ++++++++++++++++++-
>  1 file changed, 18 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/hwmon/fam15h_power.c b/drivers/hwmon/fam15h_power.c
> index 4a7cbfa..5ca24de 100644
> --- a/drivers/hwmon/fam15h_power.c
> +++ b/drivers/hwmon/fam15h_power.c
> @@ -93,13 +93,30 @@ static ssize_t show_power_crit(struct device *dev,
>  }
>  static DEVICE_ATTR(power1_crit, S_IRUGO, show_power_crit, NULL);
>  
> +static umode_t fam15h_power_is_visible(struct kobject *kobj,
> +				       struct attribute *attr,
> +				       int index)
> +{
> +	/* power1_input is only reported for Fam15h, Models 00h-0fh */
> +	if (!strcmp(attr->name, "power1_input") &&

	if (attr == &dev_attr_power1_input.attr &&

works just as well and is simpler.

> +	   (boot_cpu_data.x86 != 0x15 || boot_cpu_data.x86_model > 0xf)) {
> +		return 0;
> +	}
> +
> +	return attr->mode;
> +}
> +
>  static struct attribute *fam15h_power_attrs[] = {
>  	&dev_attr_power1_input.attr,
>  	&dev_attr_power1_crit.attr,
>  	NULL
>  };
>  
> -ATTRIBUTE_GROUPS(fam15h_power);
> +static const struct attribute_group fam15h_power_group = {
> +	.attrs = fam15h_power_attrs,
> +	.is_visible = fam15h_power_is_visible,
> +};
> +__ATTRIBUTE_GROUPS(fam15h_power);
>  
>  static bool fam15h_power_is_internal_node0(struct pci_dev *f4)
>  {
> -- 
> 2.0.2
> 
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