linux-kernel - Re: [PATCH v3 09/10] platform/x86: alienware-wmi-wmax: Add a DebugFS interface

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Message-ID: <79051f75-9217-4fd4-a515-e958a587a32b@gmx.de>
Date: Thu, 6 Mar 2025 23:38:58 +0100
From: Armin Wolf <W_Armin@....de>
To: Kurt Borja <kuurtb@...il.com>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: Hans de Goede <hdegoede@...hat.com>, platform-driver-x86@...r.kernel.org,
 Dell.Client.Kernel@...l.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 09/10] platform/x86: alienware-wmi-wmax: Add a DebugFS
 interface

Am 06.03.25 um 01:57 schrieb Kurt Borja:

> Add a debugfs interface which exposes thermal private data.
>
> Signed-off-by: Kurt Borja <kuurtb@...il.com>
> ---
>   drivers/platform/x86/dell/alienware-wmi-wmax.c | 92 ++++++++++++++++++++++++++
>   1 file changed, 92 insertions(+)
>
> diff --git a/drivers/platform/x86/dell/alienware-wmi-wmax.c b/drivers/platform/x86/dell/alienware-wmi-wmax.c
> index de4e8f177aadc9552b05cc732e41ee458b761143..23f8680a212fb9ef2a6f23aafcc2d25738ae4364 100644
> --- a/drivers/platform/x86/dell/alienware-wmi-wmax.c
> +++ b/drivers/platform/x86/dell/alienware-wmi-wmax.c
> @@ -11,6 +11,7 @@
>   #include <linux/bitfield.h>
>   #include <linux/bitmap.h>
>   #include <linux/bits.h>
> +#include <linux/debugfs.h>
>   #include <linux/dmi.h>
>   #include <linux/hwmon.h>
>   #include <linux/hwmon-sysfs.h>
> @@ -18,6 +19,7 @@
>   #include <linux/moduleparam.h>
>   #include <linux/platform_profile.h>
>   #include <linux/pm.h>
> +#include <linux/seq_file.h>
>   #include <linux/units.h>
>   #include <linux/wmi.h>
>   #include "alienware-wmi.h"
> @@ -1343,6 +1345,94 @@ static int awcc_platform_profile_init(struct wmi_device *wdev)
>   	return PTR_ERR_OR_ZERO(priv->ppdev);
>   }
>
> +/*
> + * DebugFS
> + */
> +static int awcc_debugfs_system_description_read(struct seq_file *seq, void *data)
> +{
> +	struct device *dev = seq->private;
> +	struct awcc_priv *priv = dev_get_drvdata(dev);
> +
> +	seq_printf(seq, "0x%08x\n", priv->system_description);
> +
> +	return 0;
> +}
> +
> +static int awcc_debugfs_hwmon_data_read(struct seq_file *seq, void *data)
> +{
> +	struct device *dev = seq->private;
> +	struct awcc_priv *priv = dev_get_drvdata(dev);
> +	struct awcc_fan_data *fan_data;
> +	u8 bit;
> +
> +	seq_printf(seq, "Number of fans: %u\n", priv->fan_count);
> +	seq_printf(seq, "Number of temperature sensors: %u\n\n", priv->temp_count);
> +
> +	for (u32 i = 0; i < priv->fan_count; i++) {
> +		fan_data = priv->fan_data[i];
> +
> +		seq_printf(seq, "Fan %u:\n", i);
> +		seq_printf(seq, "  ID: 0x%02x\n", fan_data->id);
> +		seq_printf(seq, "  Related temperature sensors: ");
> +		for_each_set_bit(bit, fan_data->related_temps, priv->temp_sensors_size)
> +			seq_printf(seq, "0x%02x ", bit);
> +		seq_puts(seq, "\n");
> +	}
> +
> +	seq_puts(seq, "\n");
> +
> +	seq_printf(seq, "Temperature sensor IDs:\n");
> +	for_each_set_bit(bit, priv->temp_sensors, priv->temp_sensors_size)
> +		seq_printf(seq, "  0x%02x\n", bit);
> +
> +	return 0;
> +}
> +
> +static int awcc_debugfs_pprof_data_read(struct seq_file *seq, void *data)
> +{
> +	struct device *dev = seq->private;
> +	struct awcc_priv *priv = dev_get_drvdata(dev);
> +
> +	seq_printf(seq, "Number of thermal profiles: %u\n\n", priv->profile_count);
> +
> +	for (u32 i = 0; i < PLATFORM_PROFILE_LAST; i++) {
> +		if (!priv->supported_profiles[i])
> +			continue;
> +
> +		seq_printf(seq, "Platform profile %u:\n", i);
> +		seq_printf(seq, "  ID: 0x%02x\n", priv->supported_profiles[i]);
> +	}
> +
> +	return 0;
> +}
> +
> +static void awcc_debugfs_remove(void *data)
> +{
> +	struct dentry *root = data;
> +
> +	debugfs_remove(root);
> +}
> +
> +static void awcc_debugfs_init(struct wmi_device *wdev)
> +{
> +	struct dentry *root;
> +
> +	root = debugfs_create_dir("alienware-wmi", NULL);

Please use a unique name for each driver instance. You can do this by combining the
WMI device name with the driver name.

With that being fixed:
Reviewed-by: Armin Wolf <W_Armin@....de>

> +
> +	debugfs_create_devm_seqfile(&wdev->dev, "system_description", root,
> +				    awcc_debugfs_system_description_read);
> +
> +	if (awcc->hwmon)
> +		debugfs_create_devm_seqfile(&wdev->dev, "hwmon_data", root,
> +					    awcc_debugfs_hwmon_data_read);
> +
> +	if (awcc->pprof)
> +		debugfs_create_devm_seqfile(&wdev->dev, "pprof_data", root,
> +					    awcc_debugfs_pprof_data_read);
> +
> +	devm_add_action_or_reset(&wdev->dev, awcc_debugfs_remove, root);
> +}
> +
>   static int alienware_awcc_setup(struct wmi_device *wdev)
>   {
>   	struct awcc_priv *priv;
> @@ -1381,6 +1471,8 @@ static int alienware_awcc_setup(struct wmi_device *wdev)
>   			return ret;
>   	}
>
> +	awcc_debugfs_init(wdev);
> +
>   	return 0;
>   }
>
>