linux-kernel - [PATCH 03/15] hwmon, fam15h_power: refactor attributes for dynamically added

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Date:	Thu, 27 Aug 2015 16:07:34 +0800
From:	Huang Rui <ray.huang@....com>
To:	Borislav Petkov <bp@...e.de>, Jean Delvare <jdelvare@...e.de>,
	"Guenter Roeck" <linux@...ck-us.net>,
	Andy Lutomirski <luto@...capital.net>,
	"Andreas Herrmann" <herrmann.der.user@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>,
	John Stultz <john.stultz@...aro.org>,
	Frédéric Weisbecker <fweisbec@...il.com>
CC:	<lm-sensors@...sensors.org>, <linux-kernel@...r.kernel.org>,
	<x86@...nel.org>,
	Andreas Herrmann <herrmann.der.user@...glemail.com>,
	Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>,
	Borislav Petkov <bp@...en8.de>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Aaron Lu <aaron.lu@...el.com>, Tony Li <tony.li@....com>,
	Huang Rui <ray.huang@....com>
Subject: [PATCH 03/15] hwmon, fam15h_power: refactor attributes for dynamically added

Attributes depend on the CPU model the driver gets loaded on.
Therefore, add those attributes dynamically at init time. This is more
flexible to control the different attributes on different platforms.

Signed-off-by: Huang Rui <ray.huang@....com>
---
 drivers/hwmon/fam15h_power.c | 49 +++++++++++++++++++++++++++-----------------
 1 file changed, 30 insertions(+), 19 deletions(-)

diff --git a/drivers/hwmon/fam15h_power.c b/drivers/hwmon/fam15h_power.c
index 820adf1..65ffb06 100644
--- a/drivers/hwmon/fam15h_power.c
+++ b/drivers/hwmon/fam15h_power.c
@@ -41,6 +41,8 @@ MODULE_LICENSE("GPL");
 #define REG_TDP_RUNNING_AVERAGE		0xe0
 #define REG_TDP_LIMIT3			0xe8
 
+#define FAM15H_MIN_POWER_GROUPS		2
+
 struct fam15h_power_data {
 	struct pci_dev *pdev;
 	unsigned int tdp_to_watts;
@@ -93,29 +95,35 @@ 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)
+static struct attribute_group fam15h_power_group;
+__ATTRIBUTE_GROUPS(fam15h_power);
+
+static int fam15h_power_init_attrs(struct pci_dev *pdev)
 {
-	/* power1_input is only reported for Fam15h, Models 00h-0fh */
-	if (attr == &dev_attr_power1_input.attr &&
-	   (boot_cpu_data.x86 != 0x15 || boot_cpu_data.x86_model > 0xf))
-		return 0;
+	int n = FAM15H_MIN_POWER_GROUPS;
+	struct attribute **fam15h_power_attrs;
 
-	return attr->mode;
-}
+	if (boot_cpu_data.x86 == 0x15 && boot_cpu_data.x86_model <= 0xf)
+		n += 1;
 
-static struct attribute *fam15h_power_attrs[] = {
-	&dev_attr_power1_input.attr,
-	&dev_attr_power1_crit.attr,
-	NULL
-};
+	fam15h_power_attrs = devm_kcalloc(&pdev->dev, n,
+					  sizeof(*fam15h_power_attrs),
+					  GFP_KERNEL);
 
-static const struct attribute_group fam15h_power_group = {
-	.attrs = fam15h_power_attrs,
-	.is_visible = fam15h_power_is_visible,
-};
-__ATTRIBUTE_GROUPS(fam15h_power);
+	if (!fam15h_power_attrs) {
+		dev_err(&pdev->dev, "failed to alloc fam15h_power_attrs\n");
+		return -ENOMEM;
+	}
+
+	n = 0;
+	fam15h_power_attrs[n++] = &dev_attr_power1_crit.attr;
+	if (boot_cpu_data.x86 == 0x15 && boot_cpu_data.x86_model <= 0xf)
+		fam15h_power_attrs[n++] = &dev_attr_power1_input.attr;
+
+	fam15h_power_group.attrs = fam15h_power_attrs;
+
+	return 0;
+}
 
 static bool should_load_on_this_node(struct pci_dev *f4)
 {
@@ -221,6 +229,9 @@ static int fam15h_power_probe(struct pci_dev *pdev,
 	if (!data)
 		return -ENOMEM;
 
+	if (fam15h_power_init_attrs(pdev))
+		return -ENOMEM;
+
 	fam15h_power_init_data(pdev, data);
 	data->pdev = pdev;
 
-- 
1.9.1

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