Re: [PATCH v6 09/12] platform/x86: alienware-wmi-wmax: Add a DebugFS interface

Ilpo Järvinen
2025-03-28T16:18:25Z

On Thu, 13 Mar 2025, Kurt Borja wrote:

> Add a debugfs interface which exposes thermal private data.
>
> Reviewed-by: Armin Wolf <W_Armin@gmx.de>
> Signed-off-by: Kurt Borja <kuurtb@gmail.com>
> ---
> drivers/platform/x86/dell/alienware-wmi-wmax.c | 90 ++++++++++++++++++++++++++
> 1 file changed, 90 insertions(+)
>
> diff --git a/drivers/platform/x86/dell/alienware-wmi-wmax.c b/drivers/platform/x86/dell/alienware-wmi-wmax.c
> index 823b579260555085ef6ac793b806738a756bb9da..472e6289fec5be0db0a5cb8e76718b750fa558b5 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>
> @@ -19,6 +20,7 @@
> #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"
> @@ -1252,6 +1254,92 @@ 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);
> + const struct awcc_fan_data *fan;
> + unsigned int 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 = priv->fan_data[i];
> +
> + seq_printf(seq, "Fan %u:\n", i);
> + seq_printf(seq, " ID: 0x%02x\n", fan->id);
> + seq_printf(seq, " Related temperature sensors bitmap: %lu\n",
> + fan->auto_channels_temp);
> + }
> +
> + seq_puts(seq, "\nTemperature sensor IDs:\n");
> + for_each_set_bit(bit, priv->temp_sensors, AWCC_ID_BITMAP_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;
> + char name[64];
> +
> + scnprintf(name, ARRAY_SIZE(name), "%s-%s", "alienware-wmi", dev_name(&wdev->dev));

You'd need to add include for ARRAY_SIZE() but can't you just use
sizeof()?

> + root = debugfs_create_dir(name, NULL);
> +
> + 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;
> @@ -1290,6 +1378,8 @@ static int alienware_awcc_setup(struct wmi_device *wdev)
> return ret;
> }
>
> + awcc_debugfs_init(wdev);
> +
> return 0;
> }
>
>
>

--
i.