linux-kernel - [PATCH v4 09/12] platform/x86: alienware-wmi-wmax: Add a DebugFS interface

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Message-Id: <20250308-hwm-v4-9-afa1342828f5@gmail.com>
Date: Sat, 08 Mar 2025 15:23:21 -0500
From: Kurt Borja <kuurtb@...il.com>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, 
 Armin Wolf <W_Armin@....de>
Cc: Kurt Borja <kuurtb@...il.com>, Hans de Goede <hdegoede@...hat.com>, 
 platform-driver-x86@...r.kernel.org, Dell.Client.Kernel@...l.com, 
 linux-kernel@...r.kernel.org
Subject: [PATCH v4 09/12] platform/x86: alienware-wmi-wmax: Add a DebugFS
 interface

Add a debugfs interface which exposes thermal private data.

Reviewed-by: Armin Wolf <W_Armin@....de>
Signed-off-by: Kurt Borja <kuurtb@...il.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 68ff520f016d2d567cddcefe41f01bf284b4d979..46d11b200820cdbaa841fc97e33b339fca42104e 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));
+	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;
 }
 

-- 
2.48.1