[PATCH v2 09/10] platform/x86: alienware-wmi-wmax: Add a DebugFS interface

Kurt Borja
2025-02-25T22:25:26Z

Add a debugfs interface which exposes thermal private data.

Signed-off-by: Kurt Borja <kuurtb@gmail.com>
---
.../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 64818efc3a1a..14faa6ee3e73 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"
@@ -1216,6 +1218,94 @@ 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);
+
+ 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;
@@ -1254,6 +1344,8 @@ static int alienware_awcc_setup(struct wmi_device *wdev)
return ret;
}

+ awcc_debugfs_init(wdev);
+
return 0;
}

--
2.48.1