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

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Date:	Tue, 16 Sep 2014 10:38:38 -0500
From:	Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>
To:	<herrmann.der.user@...glemail.com>, <linux@...ck-us.net>,
	<jdelvare@...e.de>, <lm-sensors@...sensors.org>,
	<linux-kernel@...r.kernel.org>
CC:	<boris.ostrovsky@...cle.com>,
	Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>
Subject: [PATCH 1/2] hwmon, fam15h_power: Make actual power reporting conditional

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") &&
+	   (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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