[PATCH v4 00/12] platform/x86: alienware-wmi-wmax: HWMON support + DebugFS + Improvements

[PATCH v4 00/12] platform/x86: alienware-wmi-wmax: HWMON support + DebugFS + Improvements

[Kurt Borja]

Hi all,

This set mainly adds hwmon and manual fan control support (patches 7-8)
to the alienware-wmi driver, after some improvements.

I have a question for anyone that may know how to solve it. In version 2
of these series the kernel test robot found a build error

	https://lore.kernel.org/platform-driver-x86/202503051819.bQ9P70Og-lkp@intel.com/

I think this happened because

	CONFIG_ALIENWARE_WMI=y

while

	CONFIG_ACPI_PLATFORM_PROFILE=m
	CONFIG_HWMON=m

How should I Kconfig to avoid this?

Thank you for your feedback :)

---
Changes in v4:

[03/12]
  - Dropped awcc_profile_id_to_pprof because it's no longer used for
    pwm*_enable attributes

[07/12]
  - Dropped pwm*_enable visibility
  - Dropped fan_data->related_temps
  - Allocate fan_data->auto_channels_temp statically
  - Allocate priv->temp_sensors statically
  - Determine and allocate fan label while probing

[08/12]
  - Dropped pwm*_enable attributes because it's incompatible with
    current ABI
  - Renamed pwm*_boost attributes to fan*_boost
  - Added dev_err logs to awcc_hwmon_suspend/resume

[11/12]
  - Introduced laptop documentation

[12/12]
  - Introduced ABI documentation

Link to v3: https://lore.kernel.org/r/20250305-hwm-v3-0-395e7a1407e2@gmail.com

---
Kurt Borja (12):
      platform/x86: alienware-wmi-wmax: Rename thermal related symbols
      platform/x86: alienware-wmi-wmax: Refactor is_awcc_thermal_mode()
      platform/x86: alienware-wmi-wmax: Improve internal AWCC API
      platform/x86: alienware-wmi-wmax: Modify supported_thermal_profiles[]
      platform/x86: alienware-wmi-wmax: Improve platform profile probe
      platform/x86: alienware-wmi-wmax: Add support for the "custom" thermal profile
      platform/x86: alienware-wmi-wmax: Add HWMON support
      platform/x86: alienware-wmi-wmax: Add support for manual fan control
      platform/x86: alienware-wmi-wmax: Add a DebugFS interface
      Documentation: wmi: Improve and update alienware-wmi documentation
      Documentation: admin-guide: laptops: Add documentation for alienware-wmi
      Documentation: ABI: Add sysfs platform and debugfs ABI documentation for alienware-wmi

 Documentation/ABI/testing/debugfs-alienware-wmi    |   44 +
 .../ABI/testing/sysfs-platform-alienware-wmi       |   14 +
 .../admin-guide/laptops/alienware-wmi.rst          |  128 +++
 Documentation/admin-guide/laptops/index.rst        |    1 +
 Documentation/wmi/devices/alienware-wmi.rst        |  383 +++-----
 MAINTAINERS                                        |    3 +
 drivers/platform/x86/dell/Kconfig                  |    1 +
 drivers/platform/x86/dell/alienware-wmi-wmax.c     | 1023 +++++++++++++++++---
 8 files changed, 1187 insertions(+), 410 deletions(-)
---
base-commit: e57eabe2fb044950e6ffdfe01803895043dec0b7
change-id: 20250305-hwm-f7bd91902b57

Best regards,
-- 
 ~ Kurt

[PATCH v4 07/12] platform/x86: alienware-wmi-wmax: Add HWMON support

[Kurt Borja]

All models with the "AWCC" WMAX device support monitoring fan speed and
temperature sensors. Expose this feature through the HWMON interface.

Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Jean Delvare <jdelvare@suse.com>
Cc: linux-hwmon@vger.kernel.org
Signed-off-by: Kurt Borja <kuurtb@gmail.com>
---
 drivers/platform/x86/dell/Kconfig              |   1 +
 drivers/platform/x86/dell/alienware-wmi-wmax.c | 396 +++++++++++++++++++++++++
 2 files changed, 397 insertions(+)

diff --git a/drivers/platform/x86/dell/Kconfig b/drivers/platform/x86/dell/Kconfig
index f8a0dffcaab7c3b423472c5b9093011334a698c8..85a57c01aaada5d899cd8252e77ed6043da5cbdf 100644
--- a/drivers/platform/x86/dell/Kconfig
+++ b/drivers/platform/x86/dell/Kconfig
@@ -43,6 +43,7 @@ config ALIENWARE_WMI_WMAX
 	bool "Alienware WMAX WMI device driver"
 	default y
 	depends on ALIENWARE_WMI
+	depends on HWMON
 	select ACPI_PLATFORM_PROFILE
 	help
 	 Alienware WMI driver with AlienFX LED, HDMI, amplifier, deep sleep and
diff --git a/drivers/platform/x86/dell/alienware-wmi-wmax.c b/drivers/platform/x86/dell/alienware-wmi-wmax.c
index 3b37e4456482bc284b8e867c1c5b6255fc6c8ef2..f1f20db206d47f644e8cd58a6d169c850606e75b 100644
--- a/drivers/platform/x86/dell/alienware-wmi-wmax.c
+++ b/drivers/platform/x86/dell/alienware-wmi-wmax.c
@@ -9,10 +9,13 @@
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/bitfield.h>
+#include <linux/bitmap.h>
 #include <linux/bits.h>
 #include <linux/dmi.h>
+#include <linux/hwmon.h>
 #include <linux/moduleparam.h>
 #include <linux/platform_profile.h>
+#include <linux/units.h>
 #include <linux/wmi.h>
 #include "alienware-wmi.h"
 
@@ -25,6 +28,7 @@
 #define WMAX_METHOD_BRIGHTNESS			0x3
 #define WMAX_METHOD_ZONE_CONTROL		0x4
 
+#define AWCC_METHOD_GET_FAN_SENSORS		0x13
 #define AWCC_METHOD_THERMAL_INFORMATION		0x14
 #define AWCC_METHOD_THERMAL_CONTROL		0x15
 #define AWCC_METHOD_GAME_SHIFT_STATUS		0x25
@@ -38,6 +42,12 @@
 
 /* Arbitrary limit based on supported models */
 #define AWCC_MAX_RES_COUNT			16
+#define AWCC_ID_BITMAP_SIZE			(U8_MAX + 1)
+#define AWCC_ID_BITMAP_LONGS			BITS_TO_LONGS(AWCC_ID_BITMAP_SIZE)
+
+static bool force_hwmon;
+module_param_unsafe(force_hwmon, bool, 0);
+MODULE_PARM_DESC(force_hwmon, "Force probing for HWMON support without checking if the WMI backend is available");
 
 static bool force_platform_profile;
 module_param_unsafe(force_platform_profile, bool, 0);
@@ -48,16 +58,19 @@ module_param_unsafe(force_gmode, bool, 0);
 MODULE_PARM_DESC(force_gmode, "Forces G-Mode when performance profile is selected");
 
 struct awcc_quirks {
+	bool hwmon;
 	bool pprof;
 	bool gmode;
 };
 
 static struct awcc_quirks g_series_quirks = {
+	.hwmon = true,
 	.pprof = true,
 	.gmode = true,
 };
 
 static struct awcc_quirks generic_quirks = {
+	.hwmon = true,
 	.pprof = true,
 	.gmode = false,
 };
@@ -155,9 +168,18 @@ static const struct dmi_system_id awcc_dmi_table[] __initconst = {
 	},
 };
 
+enum AWCC_GET_FAN_SENSORS_OPERATIONS {
+	AWCC_OP_GET_TOTAL_FAN_TEMPS		= 0x01,
+	AWCC_OP_GET_FAN_TEMP_ID			= 0x02,
+};
+
 enum AWCC_THERMAL_INFORMATION_OPERATIONS {
 	AWCC_OP_GET_SYSTEM_DESCRIPTION		= 0x02,
 	AWCC_OP_GET_RESOURCE_ID			= 0x03,
+	AWCC_OP_GET_TEMPERATURE			= 0x04,
+	AWCC_OP_GET_FAN_RPM			= 0x05,
+	AWCC_OP_GET_FAN_MIN_RPM			= 0x08,
+	AWCC_OP_GET_FAN_MAX_RPM			= 0x09,
 	AWCC_OP_GET_CURRENT_PROFILE		= 0x0B,
 };
 
@@ -180,6 +202,11 @@ enum AWCC_SPECIAL_THERMAL_CODES {
 	AWCC_SPECIAL_PROFILE_GMODE		= 0xAB,
 };
 
+enum AWCC_TEMP_SENSOR_TYPES {
+	AWCC_TEMP_SENSOR_CPU			= 0x01,
+	AWCC_TEMP_SENSOR_GPU			= 0x06,
+};
+
 enum awcc_thermal_profile {
 	AWCC_PROFILE_USTT_BALANCED,
 	AWCC_PROFILE_USTT_BALANCED_PERFORMANCE,
@@ -216,6 +243,14 @@ struct wmax_u32_args {
 	u8 arg3;
 };
 
+struct awcc_fan_data {
+	unsigned long auto_channels_temp;
+	const char *label;
+	u32 min_rpm;
+	u32 max_rpm;
+	u8 id;
+};
+
 struct awcc_priv {
 	struct wmi_device *wdev;
 	union {
@@ -231,6 +266,10 @@ struct awcc_priv {
 
 	struct device *ppdev;
 	u8 supported_profiles[PLATFORM_PROFILE_LAST];
+
+	struct device *hwdev;
+	struct awcc_fan_data **fan_data;
+	unsigned long temp_sensors[AWCC_ID_BITMAP_LONGS];
 };
 
 static const enum platform_profile_option awcc_mode_to_platform_profile[AWCC_PROFILE_LAST] = {
@@ -495,6 +534,19 @@ static int __awcc_wmi_command(struct wmi_device *wdev, u32 method_id,
 	return 0;
 }
 
+static inline int awcc_get_fan_sensors(struct wmi_device *wdev, u8 operation,
+				       u8 fan_id, u8 index, u32 *out)
+{
+	struct wmax_u32_args args = {
+		.operation = operation,
+		.arg1 = fan_id,
+		.arg2 = index,
+		.arg3 = 0,
+	};
+
+	return __awcc_wmi_command(wdev, AWCC_METHOD_GET_FAN_SENSORS, &args, out);
+}
+
 static inline int awcc_thermal_information(struct wmi_device *wdev, u8 operation,
 					   u8 arg, u32 *out)
 {
@@ -552,6 +604,30 @@ static inline int awcc_op_get_resource_id(struct wmi_device *wdev, u8 index, u32
 	return __awcc_wmi_command(wdev, AWCC_METHOD_THERMAL_INFORMATION, &args, out);
 }
 
+static inline int awcc_op_get_fan_rpm(struct wmi_device *wdev, u8 fan_id, u32 *out)
+{
+	struct wmax_u32_args args = {
+		.operation = AWCC_OP_GET_FAN_RPM,
+		.arg1 = fan_id,
+		.arg2 = 0,
+		.arg3 = 0,
+	};
+
+	return __awcc_wmi_command(wdev, AWCC_METHOD_THERMAL_INFORMATION, &args, out);
+}
+
+static inline int awcc_op_get_temperature(struct wmi_device *wdev, u8 temp_id, u32 *out)
+{
+	struct wmax_u32_args args = {
+		.operation = AWCC_OP_GET_TEMPERATURE,
+		.arg1 = temp_id,
+		.arg2 = 0,
+		.arg3 = 0,
+	};
+
+	return __awcc_wmi_command(wdev, AWCC_METHOD_THERMAL_INFORMATION, &args, out);
+}
+
 static inline int awcc_op_get_current_profile(struct wmi_device *wdev, u32 *out)
 {
 	struct wmax_u32_args args = {
@@ -577,6 +653,313 @@ static inline int awcc_op_activate_profile(struct wmi_device *wdev, u8 profile)
 	return __awcc_wmi_command(wdev, AWCC_METHOD_THERMAL_CONTROL, &args, &out);
 }
 
+/*
+ * HWMON
+ *  - Provides temperature and fan speed monitoring as well as manual fan
+ *    control
+ */
+static umode_t awcc_hwmon_is_visible(const void *drvdata, enum hwmon_sensor_types type,
+				     u32 attr, int channel)
+{
+	const struct awcc_priv *priv = drvdata;
+	unsigned int temp_count;
+
+	switch (type) {
+	case hwmon_temp:
+		temp_count = bitmap_weight(priv->temp_sensors, AWCC_ID_BITMAP_SIZE);
+
+		return channel < temp_count ? 0444 : 0;
+	case hwmon_fan:
+		return channel < priv->fan_count ? 0444 : 0;
+	case hwmon_pwm:
+		return channel < priv->fan_count ? 0444 : 0;
+	default:
+		return 0;
+	}
+}
+
+static int awcc_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
+			   u32 attr, int channel, long *val)
+{
+	struct awcc_priv *priv = dev_get_drvdata(dev);
+	const struct awcc_fan_data *fan;
+	u32 state;
+	int ret;
+	u8 temp;
+
+	switch (type) {
+	case hwmon_temp:
+		temp = find_nth_bit(priv->temp_sensors, AWCC_ID_BITMAP_SIZE, channel);
+
+		switch (attr) {
+		case hwmon_temp_input:
+			ret = awcc_op_get_temperature(priv->wdev, temp, &state);
+			if (ret)
+				return ret;
+
+			*val = state * MILLIDEGREE_PER_DEGREE;
+			break;
+		default:
+			return -EOPNOTSUPP;
+		}
+
+		break;
+	case hwmon_fan:
+		fan = priv->fan_data[channel];
+
+		switch (attr) {
+		case hwmon_fan_input:
+			ret = awcc_op_get_fan_rpm(priv->wdev, fan->id, &state);
+			if (ret)
+				return ret;
+
+			*val = state;
+			break;
+		case hwmon_fan_min:
+			*val = fan->min_rpm;
+			break;
+		case hwmon_fan_max:
+			*val = fan->max_rpm;
+			break;
+		default:
+			return -EOPNOTSUPP;
+		}
+
+		break;
+	case hwmon_pwm:
+		fan = priv->fan_data[channel];
+
+		switch (attr) {
+		case hwmon_pwm_auto_channels_temp:
+			*val = fan->auto_channels_temp;
+			break;
+		default:
+			return -EOPNOTSUPP;
+		}
+
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static int awcc_hwmon_read_string(struct device *dev, enum hwmon_sensor_types type,
+				  u32 attr, int channel, const char **str)
+{
+	struct awcc_priv *priv = dev_get_drvdata(dev);
+	u8 temp;
+
+	switch (type) {
+	case hwmon_temp:
+		temp = find_nth_bit(priv->temp_sensors, AWCC_ID_BITMAP_SIZE, channel);
+
+		switch (temp) {
+		case AWCC_TEMP_SENSOR_CPU:
+			*str = "CPU";
+			break;
+		case AWCC_TEMP_SENSOR_GPU:
+			*str = "GPU";
+			break;
+		default:
+			*str = "Unknown";
+			break;
+		}
+
+		break;
+	case hwmon_fan:
+		*str = priv->fan_data[channel]->label;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static const struct hwmon_ops awcc_hwmon_ops = {
+	.is_visible = awcc_hwmon_is_visible,
+	.read = awcc_hwmon_read,
+	.read_string = awcc_hwmon_read_string,
+};
+
+static const struct hwmon_channel_info * const awcc_hwmon_info[] = {
+	HWMON_CHANNEL_INFO(temp,
+			   HWMON_T_LABEL | HWMON_T_INPUT,
+			   HWMON_T_LABEL | HWMON_T_INPUT,
+			   HWMON_T_LABEL | HWMON_T_INPUT,
+			   HWMON_T_LABEL | HWMON_T_INPUT,
+			   HWMON_T_LABEL | HWMON_T_INPUT,
+			   HWMON_T_LABEL | HWMON_T_INPUT
+			   ),
+	HWMON_CHANNEL_INFO(fan,
+			   HWMON_F_LABEL | HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX,
+			   HWMON_F_LABEL | HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX,
+			   HWMON_F_LABEL | HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX,
+			   HWMON_F_LABEL | HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX,
+			   HWMON_F_LABEL | HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX,
+			   HWMON_F_LABEL | HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX
+			   ),
+	HWMON_CHANNEL_INFO(pwm,
+			   HWMON_PWM_AUTO_CHANNELS_TEMP,
+			   HWMON_PWM_AUTO_CHANNELS_TEMP,
+			   HWMON_PWM_AUTO_CHANNELS_TEMP,
+			   HWMON_PWM_AUTO_CHANNELS_TEMP,
+			   HWMON_PWM_AUTO_CHANNELS_TEMP,
+			   HWMON_PWM_AUTO_CHANNELS_TEMP
+			   ),
+	NULL
+};
+
+static const struct hwmon_chip_info awcc_hwmon_chip_info = {
+	.ops = &awcc_hwmon_ops,
+	.info = awcc_hwmon_info,
+};
+
+static int awcc_hwmon_temps_init(struct wmi_device *wdev)
+{
+	struct awcc_priv *priv = dev_get_drvdata(&wdev->dev);
+	unsigned int i;
+	int ret;
+	u32 id;
+
+	for (i = 0; i < priv->temp_count; i++) {
+		/*
+		 * Temperature sensors IDs are listed after the fan IDs at
+		 * offset `fan_count`
+		 */
+		ret = awcc_op_get_resource_id(wdev, i + priv->fan_count, &id);
+		if (ret)
+			return ret;
+
+		__set_bit(FIELD_GET(AWCC_RESOURCE_ID_MASK, id), priv->temp_sensors);
+	}
+
+	return 0;
+}
+
+static char *awcc_alloc_fan_label(struct device *dev, u32 temp_count, u8 temp_id)
+{
+	char *label;
+
+	switch (temp_count) {
+	case 0:
+		label = devm_kstrdup(dev, "Independent Fan", GFP_KERNEL);
+		break;
+	case 1:
+		switch (temp_id) {
+		case AWCC_TEMP_SENSOR_CPU:
+			label = devm_kstrdup(dev, "Processor Fan", GFP_KERNEL);
+			break;
+		case AWCC_TEMP_SENSOR_GPU:
+			label = devm_kstrdup(dev, "Video Fan", GFP_KERNEL);
+			break;
+		default:
+			label = devm_kstrdup(dev, "Unknown Fan", GFP_KERNEL);
+			break;
+		}
+
+		break;
+	default:
+		label = devm_kstrdup(dev, "Shared Fan", GFP_KERNEL);
+		break;
+	}
+
+	return label;
+}
+
+static int awcc_hwmon_fans_init(struct wmi_device *wdev)
+{
+	struct awcc_priv *priv = dev_get_drvdata(&wdev->dev);
+	u32 id, min_rpm, max_rpm, temp_count, temp_id;
+	unsigned long fan_temps[AWCC_ID_BITMAP_LONGS];
+	unsigned long gather[AWCC_ID_BITMAP_LONGS];
+	struct awcc_fan_data *fan_data;
+	unsigned int i, j;
+	char *label;
+	int ret;
+
+	for (i = 0; i < priv->fan_count; i++) {
+		fan_data = devm_kzalloc(&wdev->dev, sizeof(*fan_data), GFP_KERNEL);
+		if (!fan_data)
+			return -ENOMEM;
+
+		/*
+		 * Fan IDs are listed first at offset 0
+		 */
+		ret = awcc_op_get_resource_id(wdev, i, &id);
+		if (ret)
+			return ret;
+		id = FIELD_GET(AWCC_RESOURCE_ID_MASK, id);
+
+		ret = awcc_thermal_information(wdev, AWCC_OP_GET_FAN_MIN_RPM, id,
+					       &min_rpm);
+		if (ret)
+			return ret;
+
+		ret = awcc_thermal_information(wdev, AWCC_OP_GET_FAN_MAX_RPM, id,
+					       &max_rpm);
+		if (ret)
+			return ret;
+
+		ret = awcc_get_fan_sensors(wdev, AWCC_OP_GET_TOTAL_FAN_TEMPS, id,
+					   0, &temp_count);
+		if (ret)
+			return ret;
+
+		for (j = 0; j < temp_count; j++) {
+			ret = awcc_get_fan_sensors(wdev, AWCC_OP_GET_FAN_TEMP_ID,
+						   id, j, &temp_id);
+			if (ret)
+				break;
+
+			temp_id = FIELD_GET(AWCC_RESOURCE_ID_MASK, temp_id);
+			__set_bit(temp_id, fan_temps);
+		}
+
+		label = awcc_alloc_fan_label(&wdev->dev, temp_count, temp_id);
+		if (!label)
+			return -ENOMEM;
+
+		fan_data->id = id;
+		fan_data->min_rpm = min_rpm;
+		fan_data->max_rpm = max_rpm;
+		fan_data->label = label;
+		bitmap_gather(gather, fan_temps, priv->temp_sensors, AWCC_ID_BITMAP_SIZE);
+		bitmap_copy(&fan_data->auto_channels_temp, gather, priv->temp_count);
+		priv->fan_data[i] = fan_data;
+
+		bitmap_zero(fan_temps, AWCC_ID_BITMAP_SIZE);
+	}
+
+	return 0;
+}
+
+static int awcc_hwmon_init(struct wmi_device *wdev)
+{
+	struct awcc_priv *priv = dev_get_drvdata(&wdev->dev);
+	int ret;
+
+	priv->fan_data = devm_kcalloc(&wdev->dev, priv->fan_count,
+				      sizeof(*priv->fan_data), GFP_KERNEL);
+	if (!priv->fan_data)
+		return -ENOMEM;
+
+	ret = awcc_hwmon_temps_init(wdev);
+	if (ret)
+		return ret;
+
+	ret = awcc_hwmon_fans_init(wdev);
+	if (ret)
+		return ret;
+
+	priv->hwdev = devm_hwmon_device_register_with_info(&wdev->dev, "alienware_wmi", priv,
+							   &awcc_hwmon_chip_info, NULL);
+
+	return PTR_ERR_OR_ZERO(priv->hwdev);
+}
+
 /*
  * Thermal Profile control
  *  - Provides thermal profile control through the Platform Profile API
@@ -744,6 +1127,12 @@ static int alienware_awcc_setup(struct wmi_device *wdev)
 	priv->wdev = wdev;
 	dev_set_drvdata(&wdev->dev, priv);
 
+	if (awcc->hwmon) {
+		ret = awcc_hwmon_init(wdev);
+		if (ret)
+			return ret;
+	}
+
 	if (awcc->pprof) {
 		ret = awcc_platform_profile_init(wdev);
 		if (ret)
@@ -824,6 +1213,13 @@ int __init alienware_wmax_wmi_init(void)
 	if (id)
 		awcc = id->driver_data;
 
+	if (force_hwmon) {
+		if (!awcc)
+			awcc = &empty_quirks;
+
+		awcc->hwmon = true;
+	}
+
 	if (force_platform_profile) {
 		if (!awcc)
 			awcc = &empty_quirks;

-- 
2.48.1

Re: [PATCH v4 07/12] platform/x86: alienware-wmi-wmax: Add HWMON support

[Armin Wolf]

Am 08.03.25 um 21:23 schrieb Kurt Borja:

> All models with the "AWCC" WMAX device support monitoring fan speed and
> temperature sensors. Expose this feature through the HWMON interface.
>
> Cc: Guenter Roeck <linux@roeck-us.net>
> Cc: Jean Delvare <jdelvare@suse.com>
> Cc: linux-hwmon@vger.kernel.org
> Signed-off-by: Kurt Borja <kuurtb@gmail.com>
> ---
>   drivers/platform/x86/dell/Kconfig              |   1 +
>   drivers/platform/x86/dell/alienware-wmi-wmax.c | 396 +++++++++++++++++++++++++
>   2 files changed, 397 insertions(+)
>
> diff --git a/drivers/platform/x86/dell/Kconfig b/drivers/platform/x86/dell/Kconfig
> index f8a0dffcaab7c3b423472c5b9093011334a698c8..85a57c01aaada5d899cd8252e77ed6043da5cbdf 100644
> --- a/drivers/platform/x86/dell/Kconfig
> +++ b/drivers/platform/x86/dell/Kconfig
> @@ -43,6 +43,7 @@ config ALIENWARE_WMI_WMAX
>   	bool "Alienware WMAX WMI device driver"
>   	default y
>   	depends on ALIENWARE_WMI
> +	depends on HWMON
>   	select ACPI_PLATFORM_PROFILE
>   	help
>   	 Alienware WMI driver with AlienFX LED, HDMI, amplifier, deep sleep and
> diff --git a/drivers/platform/x86/dell/alienware-wmi-wmax.c b/drivers/platform/x86/dell/alienware-wmi-wmax.c
> index 3b37e4456482bc284b8e867c1c5b6255fc6c8ef2..f1f20db206d47f644e8cd58a6d169c850606e75b 100644
> --- a/drivers/platform/x86/dell/alienware-wmi-wmax.c
> +++ b/drivers/platform/x86/dell/alienware-wmi-wmax.c
> @@ -9,10 +9,13 @@
>   #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>
>   #include <linux/bitfield.h>
> +#include <linux/bitmap.h>
>   #include <linux/bits.h>
>   #include <linux/dmi.h>
> +#include <linux/hwmon.h>
>   #include <linux/moduleparam.h>
>   #include <linux/platform_profile.h>
> +#include <linux/units.h>
>   #include <linux/wmi.h>
>   #include "alienware-wmi.h"
>
> @@ -25,6 +28,7 @@
>   #define WMAX_METHOD_BRIGHTNESS			0x3
>   #define WMAX_METHOD_ZONE_CONTROL		0x4
>
> +#define AWCC_METHOD_GET_FAN_SENSORS		0x13
>   #define AWCC_METHOD_THERMAL_INFORMATION		0x14
>   #define AWCC_METHOD_THERMAL_CONTROL		0x15
>   #define AWCC_METHOD_GAME_SHIFT_STATUS		0x25
> @@ -38,6 +42,12 @@
>
>   /* Arbitrary limit based on supported models */
>   #define AWCC_MAX_RES_COUNT			16
> +#define AWCC_ID_BITMAP_SIZE			(U8_MAX + 1)
> +#define AWCC_ID_BITMAP_LONGS			BITS_TO_LONGS(AWCC_ID_BITMAP_SIZE)
> +
> +static bool force_hwmon;
> +module_param_unsafe(force_hwmon, bool, 0);
> +MODULE_PARM_DESC(force_hwmon, "Force probing for HWMON support without checking if the WMI backend is available");
>
>   static bool force_platform_profile;
>   module_param_unsafe(force_platform_profile, bool, 0);
> @@ -48,16 +58,19 @@ module_param_unsafe(force_gmode, bool, 0);
>   MODULE_PARM_DESC(force_gmode, "Forces G-Mode when performance profile is selected");
>
>   struct awcc_quirks {
> +	bool hwmon;
>   	bool pprof;
>   	bool gmode;
>   };
>
>   static struct awcc_quirks g_series_quirks = {
> +	.hwmon = true,
>   	.pprof = true,
>   	.gmode = true,
>   };
>
>   static struct awcc_quirks generic_quirks = {
> +	.hwmon = true,
>   	.pprof = true,
>   	.gmode = false,
>   };
> @@ -155,9 +168,18 @@ static const struct dmi_system_id awcc_dmi_table[] __initconst = {
>   	},
>   };
>
> +enum AWCC_GET_FAN_SENSORS_OPERATIONS {
> +	AWCC_OP_GET_TOTAL_FAN_TEMPS		= 0x01,
> +	AWCC_OP_GET_FAN_TEMP_ID			= 0x02,
> +};
> +
>   enum AWCC_THERMAL_INFORMATION_OPERATIONS {
>   	AWCC_OP_GET_SYSTEM_DESCRIPTION		= 0x02,
>   	AWCC_OP_GET_RESOURCE_ID			= 0x03,
> +	AWCC_OP_GET_TEMPERATURE			= 0x04,
> +	AWCC_OP_GET_FAN_RPM			= 0x05,
> +	AWCC_OP_GET_FAN_MIN_RPM			= 0x08,
> +	AWCC_OP_GET_FAN_MAX_RPM			= 0x09,
>   	AWCC_OP_GET_CURRENT_PROFILE		= 0x0B,
>   };
>
> @@ -180,6 +202,11 @@ enum AWCC_SPECIAL_THERMAL_CODES {
>   	AWCC_SPECIAL_PROFILE_GMODE		= 0xAB,
>   };
>
> +enum AWCC_TEMP_SENSOR_TYPES {
> +	AWCC_TEMP_SENSOR_CPU			= 0x01,
> +	AWCC_TEMP_SENSOR_GPU			= 0x06,
> +};
> +
>   enum awcc_thermal_profile {
>   	AWCC_PROFILE_USTT_BALANCED,
>   	AWCC_PROFILE_USTT_BALANCED_PERFORMANCE,
> @@ -216,6 +243,14 @@ struct wmax_u32_args {
>   	u8 arg3;
>   };
>
> +struct awcc_fan_data {
> +	unsigned long auto_channels_temp;
> +	const char *label;
> +	u32 min_rpm;
> +	u32 max_rpm;
> +	u8 id;
> +};
> +
>   struct awcc_priv {
>   	struct wmi_device *wdev;
>   	union {
> @@ -231,6 +266,10 @@ struct awcc_priv {
>
>   	struct device *ppdev;
>   	u8 supported_profiles[PLATFORM_PROFILE_LAST];
> +
> +	struct device *hwdev;
> +	struct awcc_fan_data **fan_data;
> +	unsigned long temp_sensors[AWCC_ID_BITMAP_LONGS];
>   };
>
>   static const enum platform_profile_option awcc_mode_to_platform_profile[AWCC_PROFILE_LAST] = {
> @@ -495,6 +534,19 @@ static int __awcc_wmi_command(struct wmi_device *wdev, u32 method_id,
>   	return 0;
>   }
>
> +static inline int awcc_get_fan_sensors(struct wmi_device *wdev, u8 operation,
> +				       u8 fan_id, u8 index, u32 *out)
> +{
> +	struct wmax_u32_args args = {
> +		.operation = operation,
> +		.arg1 = fan_id,
> +		.arg2 = index,
> +		.arg3 = 0,
> +	};
> +
> +	return __awcc_wmi_command(wdev, AWCC_METHOD_GET_FAN_SENSORS, &args, out);
> +}
> +
>   static inline int awcc_thermal_information(struct wmi_device *wdev, u8 operation,
>   					   u8 arg, u32 *out)
>   {
> @@ -552,6 +604,30 @@ static inline int awcc_op_get_resource_id(struct wmi_device *wdev, u8 index, u32
>   	return __awcc_wmi_command(wdev, AWCC_METHOD_THERMAL_INFORMATION, &args, out);
>   }
>
> +static inline int awcc_op_get_fan_rpm(struct wmi_device *wdev, u8 fan_id, u32 *out)
> +{
> +	struct wmax_u32_args args = {
> +		.operation = AWCC_OP_GET_FAN_RPM,
> +		.arg1 = fan_id,
> +		.arg2 = 0,
> +		.arg3 = 0,
> +	};
> +
> +	return __awcc_wmi_command(wdev, AWCC_METHOD_THERMAL_INFORMATION, &args, out);
> +}
> +
> +static inline int awcc_op_get_temperature(struct wmi_device *wdev, u8 temp_id, u32 *out)
> +{
> +	struct wmax_u32_args args = {
> +		.operation = AWCC_OP_GET_TEMPERATURE,
> +		.arg1 = temp_id,
> +		.arg2 = 0,
> +		.arg3 = 0,
> +	};
> +
> +	return __awcc_wmi_command(wdev, AWCC_METHOD_THERMAL_INFORMATION, &args, out);
> +}
> +
>   static inline int awcc_op_get_current_profile(struct wmi_device *wdev, u32 *out)
>   {
>   	struct wmax_u32_args args = {
> @@ -577,6 +653,313 @@ static inline int awcc_op_activate_profile(struct wmi_device *wdev, u8 profile)
>   	return __awcc_wmi_command(wdev, AWCC_METHOD_THERMAL_CONTROL, &args, &out);
>   }
>
> +/*
> + * HWMON
> + *  - Provides temperature and fan speed monitoring as well as manual fan
> + *    control
> + */
> +static umode_t awcc_hwmon_is_visible(const void *drvdata, enum hwmon_sensor_types type,
> +				     u32 attr, int channel)
> +{
> +	const struct awcc_priv *priv = drvdata;
> +	unsigned int temp_count;
> +
> +	switch (type) {
> +	case hwmon_temp:
> +		temp_count = bitmap_weight(priv->temp_sensors, AWCC_ID_BITMAP_SIZE);
> +
> +		return channel < temp_count ? 0444 : 0;
> +	case hwmon_fan:
> +		return channel < priv->fan_count ? 0444 : 0;
> +	case hwmon_pwm:
> +		return channel < priv->fan_count ? 0444 : 0;
> +	default:
> +		return 0;
> +	}
> +}
> +
> +static int awcc_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
> +			   u32 attr, int channel, long *val)
> +{
> +	struct awcc_priv *priv = dev_get_drvdata(dev);
> +	const struct awcc_fan_data *fan;
> +	u32 state;
> +	int ret;
> +	u8 temp;
> +
> +	switch (type) {
> +	case hwmon_temp:
> +		temp = find_nth_bit(priv->temp_sensors, AWCC_ID_BITMAP_SIZE, channel);
> +
> +		switch (attr) {
> +		case hwmon_temp_input:
> +			ret = awcc_op_get_temperature(priv->wdev, temp, &state);
> +			if (ret)
> +				return ret;
> +
> +			*val = state * MILLIDEGREE_PER_DEGREE;
> +			break;
> +		default:
> +			return -EOPNOTSUPP;
> +		}
> +
> +		break;
> +	case hwmon_fan:
> +		fan = priv->fan_data[channel];
> +
> +		switch (attr) {
> +		case hwmon_fan_input:
> +			ret = awcc_op_get_fan_rpm(priv->wdev, fan->id, &state);
> +			if (ret)
> +				return ret;
> +
> +			*val = state;
> +			break;
> +		case hwmon_fan_min:
> +			*val = fan->min_rpm;
> +			break;
> +		case hwmon_fan_max:
> +			*val = fan->max_rpm;
> +			break;
> +		default:
> +			return -EOPNOTSUPP;
> +		}
> +
> +		break;
> +	case hwmon_pwm:
> +		fan = priv->fan_data[channel];
> +
> +		switch (attr) {
> +		case hwmon_pwm_auto_channels_temp:
> +			*val = fan->auto_channels_temp;
> +			break;
> +		default:
> +			return -EOPNOTSUPP;
> +		}
> +
> +		break;
> +	default:
> +		return -EOPNOTSUPP;
> +	}
> +
> +	return 0;
> +}
> +
> +static int awcc_hwmon_read_string(struct device *dev, enum hwmon_sensor_types type,
> +				  u32 attr, int channel, const char **str)
> +{
> +	struct awcc_priv *priv = dev_get_drvdata(dev);
> +	u8 temp;
> +
> +	switch (type) {
> +	case hwmon_temp:
> +		temp = find_nth_bit(priv->temp_sensors, AWCC_ID_BITMAP_SIZE, channel);
> +
> +		switch (temp) {
> +		case AWCC_TEMP_SENSOR_CPU:
> +			*str = "CPU";
> +			break;
> +		case AWCC_TEMP_SENSOR_GPU:
> +			*str = "GPU";
> +			break;
> +		default:
> +			*str = "Unknown";
> +			break;
> +		}
> +
> +		break;
> +	case hwmon_fan:
> +		*str = priv->fan_data[channel]->label;
> +		break;
> +	default:
> +		return -EOPNOTSUPP;
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct hwmon_ops awcc_hwmon_ops = {
> +	.is_visible = awcc_hwmon_is_visible,
> +	.read = awcc_hwmon_read,
> +	.read_string = awcc_hwmon_read_string,
> +};
> +
> +static const struct hwmon_channel_info * const awcc_hwmon_info[] = {
> +	HWMON_CHANNEL_INFO(temp,
> +			   HWMON_T_LABEL | HWMON_T_INPUT,
> +			   HWMON_T_LABEL | HWMON_T_INPUT,
> +			   HWMON_T_LABEL | HWMON_T_INPUT,
> +			   HWMON_T_LABEL | HWMON_T_INPUT,
> +			   HWMON_T_LABEL | HWMON_T_INPUT,
> +			   HWMON_T_LABEL | HWMON_T_INPUT
> +			   ),
> +	HWMON_CHANNEL_INFO(fan,
> +			   HWMON_F_LABEL | HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX,
> +			   HWMON_F_LABEL | HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX,
> +			   HWMON_F_LABEL | HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX,
> +			   HWMON_F_LABEL | HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX,
> +			   HWMON_F_LABEL | HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX,
> +			   HWMON_F_LABEL | HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX
> +			   ),
> +	HWMON_CHANNEL_INFO(pwm,
> +			   HWMON_PWM_AUTO_CHANNELS_TEMP,
> +			   HWMON_PWM_AUTO_CHANNELS_TEMP,
> +			   HWMON_PWM_AUTO_CHANNELS_TEMP,
> +			   HWMON_PWM_AUTO_CHANNELS_TEMP,
> +			   HWMON_PWM_AUTO_CHANNELS_TEMP,
> +			   HWMON_PWM_AUTO_CHANNELS_TEMP
> +			   ),
> +	NULL
> +};
> +
> +static const struct hwmon_chip_info awcc_hwmon_chip_info = {
> +	.ops = &awcc_hwmon_ops,
> +	.info = awcc_hwmon_info,
> +};
> +
> +static int awcc_hwmon_temps_init(struct wmi_device *wdev)
> +{
> +	struct awcc_priv *priv = dev_get_drvdata(&wdev->dev);
> +	unsigned int i;
> +	int ret;
> +	u32 id;
> +
> +	for (i = 0; i < priv->temp_count; i++) {
> +		/*
> +		 * Temperature sensors IDs are listed after the fan IDs at
> +		 * offset `fan_count`
> +		 */
> +		ret = awcc_op_get_resource_id(wdev, i + priv->fan_count, &id);
> +		if (ret)
> +			return ret;
> +
> +		__set_bit(FIELD_GET(AWCC_RESOURCE_ID_MASK, id), priv->temp_sensors);
> +	}
> +
> +	return 0;
> +}
> +
> +static char *awcc_alloc_fan_label(struct device *dev, u32 temp_count, u8 temp_id)
> +{
> +	char *label;
> +
> +	switch (temp_count) {
> +	case 0:
> +		label = devm_kstrdup(dev, "Independent Fan", GFP_KERNEL);
> +		break;
> +	case 1:
> +		switch (temp_id) {
> +		case AWCC_TEMP_SENSOR_CPU:
> +			label = devm_kstrdup(dev, "Processor Fan", GFP_KERNEL);
> +			break;
> +		case AWCC_TEMP_SENSOR_GPU:
> +			label = devm_kstrdup(dev, "Video Fan", GFP_KERNEL);
> +			break;
> +		default:
> +			label = devm_kstrdup(dev, "Unknown Fan", GFP_KERNEL);
> +			break;
> +		}
> +
> +		break;
> +	default:
> +		label = devm_kstrdup(dev, "Shared Fan", GFP_KERNEL);

All of those strings are static, please drop the usage of devm_kstrdup() here.

With those issues being addressed:
Reviewed-by: Armin Wolf <W_Armin@gmx.de>

> +		break;
> +	}
> +
> +	return label;
> +}
> +
> +static int awcc_hwmon_fans_init(struct wmi_device *wdev)
> +{
> +	struct awcc_priv *priv = dev_get_drvdata(&wdev->dev);
> +	u32 id, min_rpm, max_rpm, temp_count, temp_id;
> +	unsigned long fan_temps[AWCC_ID_BITMAP_LONGS];
> +	unsigned long gather[AWCC_ID_BITMAP_LONGS];
> +	struct awcc_fan_data *fan_data;
> +	unsigned int i, j;
> +	char *label;
> +	int ret;
> +
> +	for (i = 0; i < priv->fan_count; i++) {
> +		fan_data = devm_kzalloc(&wdev->dev, sizeof(*fan_data), GFP_KERNEL);
> +		if (!fan_data)
> +			return -ENOMEM;
> +
> +		/*
> +		 * Fan IDs are listed first at offset 0
> +		 */
> +		ret = awcc_op_get_resource_id(wdev, i, &id);
> +		if (ret)
> +			return ret;
> +		id = FIELD_GET(AWCC_RESOURCE_ID_MASK, id);
> +
> +		ret = awcc_thermal_information(wdev, AWCC_OP_GET_FAN_MIN_RPM, id,
> +					       &min_rpm);
> +		if (ret)
> +			return ret;
> +
> +		ret = awcc_thermal_information(wdev, AWCC_OP_GET_FAN_MAX_RPM, id,
> +					       &max_rpm);
> +		if (ret)
> +			return ret;
> +
> +		ret = awcc_get_fan_sensors(wdev, AWCC_OP_GET_TOTAL_FAN_TEMPS, id,
> +					   0, &temp_count);
> +		if (ret)
> +			return ret;
> +
> +		for (j = 0; j < temp_count; j++) {
> +			ret = awcc_get_fan_sensors(wdev, AWCC_OP_GET_FAN_TEMP_ID,
> +						   id, j, &temp_id);
> +			if (ret)
> +				break;
> +
> +			temp_id = FIELD_GET(AWCC_RESOURCE_ID_MASK, temp_id);
> +			__set_bit(temp_id, fan_temps);
> +		}
> +
> +		label = awcc_alloc_fan_label(&wdev->dev, temp_count, temp_id);
> +		if (!label)
> +			return -ENOMEM;
> +
> +		fan_data->id = id;
> +		fan_data->min_rpm = min_rpm;
> +		fan_data->max_rpm = max_rpm;
> +		fan_data->label = label;
> +		bitmap_gather(gather, fan_temps, priv->temp_sensors, AWCC_ID_BITMAP_SIZE);
> +		bitmap_copy(&fan_data->auto_channels_temp, gather, priv->temp_count);

Please check that the bitmap can fit into the long variable before using bitmap_copy().

> +		priv->fan_data[i] = fan_data;
> +
> +		bitmap_zero(fan_temps, AWCC_ID_BITMAP_SIZE);
> +	}
> +
> +	return 0;
> +}
> +
> +static int awcc_hwmon_init(struct wmi_device *wdev)
> +{
> +	struct awcc_priv *priv = dev_get_drvdata(&wdev->dev);
> +	int ret;
> +
> +	priv->fan_data = devm_kcalloc(&wdev->dev, priv->fan_count,
> +				      sizeof(*priv->fan_data), GFP_KERNEL);
> +	if (!priv->fan_data)
> +		return -ENOMEM;
> +
> +	ret = awcc_hwmon_temps_init(wdev);
> +	if (ret)
> +		return ret;
> +
> +	ret = awcc_hwmon_fans_init(wdev);
> +	if (ret)
> +		return ret;
> +
> +	priv->hwdev = devm_hwmon_device_register_with_info(&wdev->dev, "alienware_wmi", priv,
> +							   &awcc_hwmon_chip_info, NULL);
> +
> +	return PTR_ERR_OR_ZERO(priv->hwdev);
> +}
> +
>   /*
>    * Thermal Profile control
>    *  - Provides thermal profile control through the Platform Profile API
> @@ -744,6 +1127,12 @@ static int alienware_awcc_setup(struct wmi_device *wdev)
>   	priv->wdev = wdev;
>   	dev_set_drvdata(&wdev->dev, priv);
>
> +	if (awcc->hwmon) {
> +		ret = awcc_hwmon_init(wdev);
> +		if (ret)
> +			return ret;
> +	}
> +
>   	if (awcc->pprof) {
>   		ret = awcc_platform_profile_init(wdev);
>   		if (ret)
> @@ -824,6 +1213,13 @@ int __init alienware_wmax_wmi_init(void)
>   	if (id)
>   		awcc = id->driver_data;
>
> +	if (force_hwmon) {
> +		if (!awcc)
> +			awcc = &empty_quirks;
> +
> +		awcc->hwmon = true;
> +	}
> +
>   	if (force_platform_profile) {
>   		if (!awcc)
>   			awcc = &empty_quirks;
>

Re: [PATCH v4 07/12] platform/x86: alienware-wmi-wmax: Add HWMON support

[Kurt Borja]

On Tue Mar 11, 2025 at 1:55 PM -05, Armin Wolf wrote:
> Am 08.03.25 um 21:23 schrieb Kurt Borja:
>
>> All models with the "AWCC" WMAX device support monitoring fan speed and
>> temperature sensors. Expose this feature through the HWMON interface.
>>
>> Cc: Guenter Roeck <linux@roeck-us.net>
>> Cc: Jean Delvare <jdelvare@suse.com>
>> Cc: linux-hwmon@vger.kernel.org
>> Signed-off-by: Kurt Borja <kuurtb@gmail.com>
>> ---
>>   drivers/platform/x86/dell/Kconfig              |   1 +
>>   drivers/platform/x86/dell/alienware-wmi-wmax.c | 396 +++++++++++++++++++++++++
>>   2 files changed, 397 insertions(+)
>>
>> diff --git a/drivers/platform/x86/dell/Kconfig b/drivers/platform/x86/dell/Kconfig
>> index f8a0dffcaab7c3b423472c5b9093011334a698c8..85a57c01aaada5d899cd8252e77ed6043da5cbdf 100644
>> --- a/drivers/platform/x86/dell/Kconfig
>> +++ b/drivers/platform/x86/dell/Kconfig
>> @@ -43,6 +43,7 @@ config ALIENWARE_WMI_WMAX
>>   	bool "Alienware WMAX WMI device driver"
>>   	default y
>>   	depends on ALIENWARE_WMI
>> +	depends on HWMON
>>   	select ACPI_PLATFORM_PROFILE
>>   	help
>>   	 Alienware WMI driver with AlienFX LED, HDMI, amplifier, deep sleep and
>> diff --git a/drivers/platform/x86/dell/alienware-wmi-wmax.c b/drivers/platform/x86/dell/alienware-wmi-wmax.c
>> index 3b37e4456482bc284b8e867c1c5b6255fc6c8ef2..f1f20db206d47f644e8cd58a6d169c850606e75b 100644
>> --- a/drivers/platform/x86/dell/alienware-wmi-wmax.c
>> +++ b/drivers/platform/x86/dell/alienware-wmi-wmax.c
>> @@ -9,10 +9,13 @@
>>   #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>>
>>   #include <linux/bitfield.h>
>> +#include <linux/bitmap.h>
>>   #include <linux/bits.h>
>>   #include <linux/dmi.h>
>> +#include <linux/hwmon.h>
>>   #include <linux/moduleparam.h>
>>   #include <linux/platform_profile.h>
>> +#include <linux/units.h>
>>   #include <linux/wmi.h>
>>   #include "alienware-wmi.h"
>>
>> @@ -25,6 +28,7 @@
>>   #define WMAX_METHOD_BRIGHTNESS			0x3
>>   #define WMAX_METHOD_ZONE_CONTROL		0x4
>>
>> +#define AWCC_METHOD_GET_FAN_SENSORS		0x13
>>   #define AWCC_METHOD_THERMAL_INFORMATION		0x14
>>   #define AWCC_METHOD_THERMAL_CONTROL		0x15
>>   #define AWCC_METHOD_GAME_SHIFT_STATUS		0x25
>> @@ -38,6 +42,12 @@
>>
>>   /* Arbitrary limit based on supported models */
>>   #define AWCC_MAX_RES_COUNT			16
>> +#define AWCC_ID_BITMAP_SIZE			(U8_MAX + 1)
>> +#define AWCC_ID_BITMAP_LONGS			BITS_TO_LONGS(AWCC_ID_BITMAP_SIZE)
>> +
>> +static bool force_hwmon;
>> +module_param_unsafe(force_hwmon, bool, 0);
>> +MODULE_PARM_DESC(force_hwmon, "Force probing for HWMON support without checking if the WMI backend is available");
>>
>>   static bool force_platform_profile;
>>   module_param_unsafe(force_platform_profile, bool, 0);
>> @@ -48,16 +58,19 @@ module_param_unsafe(force_gmode, bool, 0);
>>   MODULE_PARM_DESC(force_gmode, "Forces G-Mode when performance profile is selected");
>>
>>   struct awcc_quirks {
>> +	bool hwmon;
>>   	bool pprof;
>>   	bool gmode;
>>   };
>>
>>   static struct awcc_quirks g_series_quirks = {
>> +	.hwmon = true,
>>   	.pprof = true,
>>   	.gmode = true,
>>   };
>>
>>   static struct awcc_quirks generic_quirks = {
>> +	.hwmon = true,
>>   	.pprof = true,
>>   	.gmode = false,
>>   };
>> @@ -155,9 +168,18 @@ static const struct dmi_system_id awcc_dmi_table[] __initconst = {
>>   	},
>>   };
>>
>> +enum AWCC_GET_FAN_SENSORS_OPERATIONS {
>> +	AWCC_OP_GET_TOTAL_FAN_TEMPS		= 0x01,
>> +	AWCC_OP_GET_FAN_TEMP_ID			= 0x02,
>> +};
>> +
>>   enum AWCC_THERMAL_INFORMATION_OPERATIONS {
>>   	AWCC_OP_GET_SYSTEM_DESCRIPTION		= 0x02,
>>   	AWCC_OP_GET_RESOURCE_ID			= 0x03,
>> +	AWCC_OP_GET_TEMPERATURE			= 0x04,
>> +	AWCC_OP_GET_FAN_RPM			= 0x05,
>> +	AWCC_OP_GET_FAN_MIN_RPM			= 0x08,
>> +	AWCC_OP_GET_FAN_MAX_RPM			= 0x09,
>>   	AWCC_OP_GET_CURRENT_PROFILE		= 0x0B,
>>   };
>>
>> @@ -180,6 +202,11 @@ enum AWCC_SPECIAL_THERMAL_CODES {
>>   	AWCC_SPECIAL_PROFILE_GMODE		= 0xAB,
>>   };
>>
>> +enum AWCC_TEMP_SENSOR_TYPES {
>> +	AWCC_TEMP_SENSOR_CPU			= 0x01,
>> +	AWCC_TEMP_SENSOR_GPU			= 0x06,
>> +};
>> +
>>   enum awcc_thermal_profile {
>>   	AWCC_PROFILE_USTT_BALANCED,
>>   	AWCC_PROFILE_USTT_BALANCED_PERFORMANCE,
>> @@ -216,6 +243,14 @@ struct wmax_u32_args {
>>   	u8 arg3;
>>   };
>>
>> +struct awcc_fan_data {
>> +	unsigned long auto_channels_temp;
>> +	const char *label;
>> +	u32 min_rpm;
>> +	u32 max_rpm;
>> +	u8 id;
>> +};
>> +
>>   struct awcc_priv {
>>   	struct wmi_device *wdev;
>>   	union {
>> @@ -231,6 +266,10 @@ struct awcc_priv {
>>
>>   	struct device *ppdev;
>>   	u8 supported_profiles[PLATFORM_PROFILE_LAST];
>> +
>> +	struct device *hwdev;
>> +	struct awcc_fan_data **fan_data;
>> +	unsigned long temp_sensors[AWCC_ID_BITMAP_LONGS];
>>   };
>>
>>   static const enum platform_profile_option awcc_mode_to_platform_profile[AWCC_PROFILE_LAST] = {
>> @@ -495,6 +534,19 @@ static int __awcc_wmi_command(struct wmi_device *wdev, u32 method_id,
>>   	return 0;
>>   }
>>
>> +static inline int awcc_get_fan_sensors(struct wmi_device *wdev, u8 operation,
>> +				       u8 fan_id, u8 index, u32 *out)
>> +{
>> +	struct wmax_u32_args args = {
>> +		.operation = operation,
>> +		.arg1 = fan_id,
>> +		.arg2 = index,
>> +		.arg3 = 0,
>> +	};
>> +
>> +	return __awcc_wmi_command(wdev, AWCC_METHOD_GET_FAN_SENSORS, &args, out);
>> +}
>> +
>>   static inline int awcc_thermal_information(struct wmi_device *wdev, u8 operation,
>>   					   u8 arg, u32 *out)
>>   {
>> @@ -552,6 +604,30 @@ static inline int awcc_op_get_resource_id(struct wmi_device *wdev, u8 index, u32
>>   	return __awcc_wmi_command(wdev, AWCC_METHOD_THERMAL_INFORMATION, &args, out);
>>   }
>>
>> +static inline int awcc_op_get_fan_rpm(struct wmi_device *wdev, u8 fan_id, u32 *out)
>> +{
>> +	struct wmax_u32_args args = {
>> +		.operation = AWCC_OP_GET_FAN_RPM,
>> +		.arg1 = fan_id,
>> +		.arg2 = 0,
>> +		.arg3 = 0,
>> +	};
>> +
>> +	return __awcc_wmi_command(wdev, AWCC_METHOD_THERMAL_INFORMATION, &args, out);
>> +}
>> +
>> +static inline int awcc_op_get_temperature(struct wmi_device *wdev, u8 temp_id, u32 *out)
>> +{
>> +	struct wmax_u32_args args = {
>> +		.operation = AWCC_OP_GET_TEMPERATURE,
>> +		.arg1 = temp_id,
>> +		.arg2 = 0,
>> +		.arg3 = 0,
>> +	};
>> +
>> +	return __awcc_wmi_command(wdev, AWCC_METHOD_THERMAL_INFORMATION, &args, out);
>> +}
>> +
>>   static inline int awcc_op_get_current_profile(struct wmi_device *wdev, u32 *out)
>>   {
>>   	struct wmax_u32_args args = {
>> @@ -577,6 +653,313 @@ static inline int awcc_op_activate_profile(struct wmi_device *wdev, u8 profile)
>>   	return __awcc_wmi_command(wdev, AWCC_METHOD_THERMAL_CONTROL, &args, &out);
>>   }
>>
>> +/*
>> + * HWMON
>> + *  - Provides temperature and fan speed monitoring as well as manual fan
>> + *    control
>> + */
>> +static umode_t awcc_hwmon_is_visible(const void *drvdata, enum hwmon_sensor_types type,
>> +				     u32 attr, int channel)
>> +{
>> +	const struct awcc_priv *priv = drvdata;
>> +	unsigned int temp_count;
>> +
>> +	switch (type) {
>> +	case hwmon_temp:
>> +		temp_count = bitmap_weight(priv->temp_sensors, AWCC_ID_BITMAP_SIZE);
>> +
>> +		return channel < temp_count ? 0444 : 0;
>> +	case hwmon_fan:
>> +		return channel < priv->fan_count ? 0444 : 0;
>> +	case hwmon_pwm:
>> +		return channel < priv->fan_count ? 0444 : 0;
>> +	default:
>> +		return 0;
>> +	}
>> +}
>> +
>> +static int awcc_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
>> +			   u32 attr, int channel, long *val)
>> +{
>> +	struct awcc_priv *priv = dev_get_drvdata(dev);
>> +	const struct awcc_fan_data *fan;
>> +	u32 state;
>> +	int ret;
>> +	u8 temp;
>> +
>> +	switch (type) {
>> +	case hwmon_temp:
>> +		temp = find_nth_bit(priv->temp_sensors, AWCC_ID_BITMAP_SIZE, channel);
>> +
>> +		switch (attr) {
>> +		case hwmon_temp_input:
>> +			ret = awcc_op_get_temperature(priv->wdev, temp, &state);
>> +			if (ret)
>> +				return ret;
>> +
>> +			*val = state * MILLIDEGREE_PER_DEGREE;
>> +			break;
>> +		default:
>> +			return -EOPNOTSUPP;
>> +		}
>> +
>> +		break;
>> +	case hwmon_fan:
>> +		fan = priv->fan_data[channel];
>> +
>> +		switch (attr) {
>> +		case hwmon_fan_input:
>> +			ret = awcc_op_get_fan_rpm(priv->wdev, fan->id, &state);
>> +			if (ret)
>> +				return ret;
>> +
>> +			*val = state;
>> +			break;
>> +		case hwmon_fan_min:
>> +			*val = fan->min_rpm;
>> +			break;
>> +		case hwmon_fan_max:
>> +			*val = fan->max_rpm;
>> +			break;
>> +		default:
>> +			return -EOPNOTSUPP;
>> +		}
>> +
>> +		break;
>> +	case hwmon_pwm:
>> +		fan = priv->fan_data[channel];
>> +
>> +		switch (attr) {
>> +		case hwmon_pwm_auto_channels_temp:
>> +			*val = fan->auto_channels_temp;
>> +			break;
>> +		default:
>> +			return -EOPNOTSUPP;
>> +		}
>> +
>> +		break;
>> +	default:
>> +		return -EOPNOTSUPP;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int awcc_hwmon_read_string(struct device *dev, enum hwmon_sensor_types type,
>> +				  u32 attr, int channel, const char **str)
>> +{
>> +	struct awcc_priv *priv = dev_get_drvdata(dev);
>> +	u8 temp;
>> +
>> +	switch (type) {
>> +	case hwmon_temp:
>> +		temp = find_nth_bit(priv->temp_sensors, AWCC_ID_BITMAP_SIZE, channel);
>> +
>> +		switch (temp) {
>> +		case AWCC_TEMP_SENSOR_CPU:
>> +			*str = "CPU";
>> +			break;
>> +		case AWCC_TEMP_SENSOR_GPU:
>> +			*str = "GPU";
>> +			break;
>> +		default:
>> +			*str = "Unknown";
>> +			break;
>> +		}
>> +
>> +		break;
>> +	case hwmon_fan:
>> +		*str = priv->fan_data[channel]->label;
>> +		break;
>> +	default:
>> +		return -EOPNOTSUPP;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct hwmon_ops awcc_hwmon_ops = {
>> +	.is_visible = awcc_hwmon_is_visible,
>> +	.read = awcc_hwmon_read,
>> +	.read_string = awcc_hwmon_read_string,
>> +};
>> +
>> +static const struct hwmon_channel_info * const awcc_hwmon_info[] = {
>> +	HWMON_CHANNEL_INFO(temp,
>> +			   HWMON_T_LABEL | HWMON_T_INPUT,
>> +			   HWMON_T_LABEL | HWMON_T_INPUT,
>> +			   HWMON_T_LABEL | HWMON_T_INPUT,
>> +			   HWMON_T_LABEL | HWMON_T_INPUT,
>> +			   HWMON_T_LABEL | HWMON_T_INPUT,
>> +			   HWMON_T_LABEL | HWMON_T_INPUT
>> +			   ),
>> +	HWMON_CHANNEL_INFO(fan,
>> +			   HWMON_F_LABEL | HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX,
>> +			   HWMON_F_LABEL | HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX,
>> +			   HWMON_F_LABEL | HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX,
>> +			   HWMON_F_LABEL | HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX,
>> +			   HWMON_F_LABEL | HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX,
>> +			   HWMON_F_LABEL | HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX
>> +			   ),
>> +	HWMON_CHANNEL_INFO(pwm,
>> +			   HWMON_PWM_AUTO_CHANNELS_TEMP,
>> +			   HWMON_PWM_AUTO_CHANNELS_TEMP,
>> +			   HWMON_PWM_AUTO_CHANNELS_TEMP,
>> +			   HWMON_PWM_AUTO_CHANNELS_TEMP,
>> +			   HWMON_PWM_AUTO_CHANNELS_TEMP,
>> +			   HWMON_PWM_AUTO_CHANNELS_TEMP
>> +			   ),
>> +	NULL
>> +};
>> +
>> +static const struct hwmon_chip_info awcc_hwmon_chip_info = {
>> +	.ops = &awcc_hwmon_ops,
>> +	.info = awcc_hwmon_info,
>> +};
>> +
>> +static int awcc_hwmon_temps_init(struct wmi_device *wdev)
>> +{
>> +	struct awcc_priv *priv = dev_get_drvdata(&wdev->dev);
>> +	unsigned int i;
>> +	int ret;
>> +	u32 id;
>> +
>> +	for (i = 0; i < priv->temp_count; i++) {
>> +		/*
>> +		 * Temperature sensors IDs are listed after the fan IDs at
>> +		 * offset `fan_count`
>> +		 */
>> +		ret = awcc_op_get_resource_id(wdev, i + priv->fan_count, &id);
>> +		if (ret)
>> +			return ret;
>> +
>> +		__set_bit(FIELD_GET(AWCC_RESOURCE_ID_MASK, id), priv->temp_sensors);
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static char *awcc_alloc_fan_label(struct device *dev, u32 temp_count, u8 temp_id)
>> +{
>> +	char *label;
>> +
>> +	switch (temp_count) {
>> +	case 0:
>> +		label = devm_kstrdup(dev, "Independent Fan", GFP_KERNEL);
>> +		break;
>> +	case 1:
>> +		switch (temp_id) {
>> +		case AWCC_TEMP_SENSOR_CPU:
>> +			label = devm_kstrdup(dev, "Processor Fan", GFP_KERNEL);
>> +			break;
>> +		case AWCC_TEMP_SENSOR_GPU:
>> +			label = devm_kstrdup(dev, "Video Fan", GFP_KERNEL);
>> +			break;
>> +		default:
>> +			label = devm_kstrdup(dev, "Unknown Fan", GFP_KERNEL);
>> +			break;
>> +		}
>> +
>> +		break;
>> +	default:
>> +		label = devm_kstrdup(dev, "Shared Fan", GFP_KERNEL);
>
> All of those strings are static, please drop the usage of devm_kstrdup() here.

Right! They are string literals.

>
> With those issues being addressed:
> Reviewed-by: Armin Wolf <W_Armin@gmx.de>
>
>> +		break;
>> +	}
>> +
>> +	return label;
>> +}
>> +
>> +static int awcc_hwmon_fans_init(struct wmi_device *wdev)
>> +{
>> +	struct awcc_priv *priv = dev_get_drvdata(&wdev->dev);
>> +	u32 id, min_rpm, max_rpm, temp_count, temp_id;
>> +	unsigned long fan_temps[AWCC_ID_BITMAP_LONGS];
>> +	unsigned long gather[AWCC_ID_BITMAP_LONGS];
>> +	struct awcc_fan_data *fan_data;
>> +	unsigned int i, j;
>> +	char *label;
>> +	int ret;
>> +
>> +	for (i = 0; i < priv->fan_count; i++) {
>> +		fan_data = devm_kzalloc(&wdev->dev, sizeof(*fan_data), GFP_KERNEL);
>> +		if (!fan_data)
>> +			return -ENOMEM;
>> +
>> +		/*
>> +		 * Fan IDs are listed first at offset 0
>> +		 */
>> +		ret = awcc_op_get_resource_id(wdev, i, &id);
>> +		if (ret)
>> +			return ret;
>> +		id = FIELD_GET(AWCC_RESOURCE_ID_MASK, id);
>> +
>> +		ret = awcc_thermal_information(wdev, AWCC_OP_GET_FAN_MIN_RPM, id,
>> +					       &min_rpm);
>> +		if (ret)
>> +			return ret;
>> +
>> +		ret = awcc_thermal_information(wdev, AWCC_OP_GET_FAN_MAX_RPM, id,
>> +					       &max_rpm);
>> +		if (ret)
>> +			return ret;
>> +
>> +		ret = awcc_get_fan_sensors(wdev, AWCC_OP_GET_TOTAL_FAN_TEMPS, id,
>> +					   0, &temp_count);
>> +		if (ret)
>> +			return ret;
>> +
>> +		for (j = 0; j < temp_count; j++) {
>> +			ret = awcc_get_fan_sensors(wdev, AWCC_OP_GET_FAN_TEMP_ID,
>> +						   id, j, &temp_id);
>> +			if (ret)
>> +				break;
>> +
>> +			temp_id = FIELD_GET(AWCC_RESOURCE_ID_MASK, temp_id);
>> +			__set_bit(temp_id, fan_temps);
>> +		}
>> +
>> +		label = awcc_alloc_fan_label(&wdev->dev, temp_count, temp_id);
>> +		if (!label)
>> +			return -ENOMEM;
>> +
>> +		fan_data->id = id;
>> +		fan_data->min_rpm = min_rpm;
>> +		fan_data->max_rpm = max_rpm;
>> +		fan_data->label = label;
>> +		bitmap_gather(gather, fan_temps, priv->temp_sensors, AWCC_ID_BITMAP_SIZE);
>> +		bitmap_copy(&fan_data->auto_channels_temp, gather, priv->temp_count);
>
> Please check that the bitmap can fit into the long variable before using bitmap_copy().

priv->temp_count is bounded by AWCC_MAX_RES_COUNT which is 16.

I don't think it will ever be bigger than 64, but I will replace it with
BITS_PER_LONG just to be extra careful.

Thank you very much for reviewing the whole series!

-- 
 ~ Kurt

[PATCH v4 08/12] platform/x86: alienware-wmi-wmax: Add support for manual fan control

[Kurt Borja]

All models with the "AWCC" WMAX device support a way of manually
controlling fans.

The PWM duty cycle of a fan can't be controlled directly. Instead the
AWCC interface let's us tune a fan `boost` value, which has the
following empirically discovered, aproximate behavior over the PWM
value:

	pwm = pwm_base + (fan_boost / 255) * (pwm_max - pwm_base)

Where the pwm_base is the locked PWM value controlled by the FW and
fan_boost is a value between 0 and 255.

Expose this fan_boost knob as a custom HWMON attribute.

Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Jean Delvare <jdelvare@suse.com>
Cc: linux-hwmon@vger.kernel.org
Signed-off-by: Kurt Borja <kuurtb@gmail.com>
---
 drivers/platform/x86/dell/alienware-wmi-wmax.c | 174 ++++++++++++++++++++++++-
 1 file changed, 172 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/dell/alienware-wmi-wmax.c b/drivers/platform/x86/dell/alienware-wmi-wmax.c
index f1f20db206d47f644e8cd58a6d169c850606e75b..68ff520f016d2d567cddcefe41f01bf284b4d979 100644
--- a/drivers/platform/x86/dell/alienware-wmi-wmax.c
+++ b/drivers/platform/x86/dell/alienware-wmi-wmax.c
@@ -13,8 +13,12 @@
 #include <linux/bits.h>
 #include <linux/dmi.h>
 #include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/kstrtox.h>
+#include <linux/minmax.h>
 #include <linux/moduleparam.h>
 #include <linux/platform_profile.h>
+#include <linux/pm.h>
 #include <linux/units.h>
 #include <linux/wmi.h>
 #include "alienware-wmi.h"
@@ -181,10 +185,12 @@ enum AWCC_THERMAL_INFORMATION_OPERATIONS {
 	AWCC_OP_GET_FAN_MIN_RPM			= 0x08,
 	AWCC_OP_GET_FAN_MAX_RPM			= 0x09,
 	AWCC_OP_GET_CURRENT_PROFILE		= 0x0B,
+	AWCC_OP_GET_FAN_BOOST			= 0x0C,
 };
 
 enum AWCC_THERMAL_CONTROL_OPERATIONS {
 	AWCC_OP_ACTIVATE_PROFILE		= 0x01,
+	AWCC_OP_SET_FAN_BOOST			= 0x02,
 };
 
 enum AWCC_GAME_SHIFT_STATUS_OPERATIONS {
@@ -248,6 +254,7 @@ struct awcc_fan_data {
 	const char *label;
 	u32 min_rpm;
 	u32 max_rpm;
+	u8 suspend_cache;
 	u8 id;
 };
 
@@ -628,6 +635,18 @@ static inline int awcc_op_get_temperature(struct wmi_device *wdev, u8 temp_id, u
 	return __awcc_wmi_command(wdev, AWCC_METHOD_THERMAL_INFORMATION, &args, out);
 }
 
+static inline int awcc_op_get_fan_boost(struct wmi_device *wdev, u8 fan_id, u32 *out)
+{
+	struct wmax_u32_args args = {
+		.operation = AWCC_OP_GET_FAN_BOOST,
+		.arg1 = fan_id,
+		.arg2 = 0,
+		.arg3 = 0,
+	};
+
+	return __awcc_wmi_command(wdev, AWCC_METHOD_THERMAL_INFORMATION, &args, out);
+}
+
 static inline int awcc_op_get_current_profile(struct wmi_device *wdev, u32 *out)
 {
 	struct wmax_u32_args args = {
@@ -653,6 +672,19 @@ static inline int awcc_op_activate_profile(struct wmi_device *wdev, u8 profile)
 	return __awcc_wmi_command(wdev, AWCC_METHOD_THERMAL_CONTROL, &args, &out);
 }
 
+static inline int awcc_op_set_fan_boost(struct wmi_device *wdev, u8 fan_id, u8 boost)
+{
+	struct wmax_u32_args args = {
+		.operation = AWCC_OP_SET_FAN_BOOST,
+		.arg1 = fan_id,
+		.arg2 = boost,
+		.arg3 = 0,
+	};
+	u32 out;
+
+	return __awcc_wmi_command(wdev, AWCC_METHOD_THERMAL_CONTROL, &args, &out);
+}
+
 /*
  * HWMON
  *  - Provides temperature and fan speed monitoring as well as manual fan
@@ -817,6 +849,81 @@ static const struct hwmon_chip_info awcc_hwmon_chip_info = {
 	.info = awcc_hwmon_info,
 };
 
+static ssize_t fan_boost_show(struct device *dev, struct device_attribute *attr,
+			      char *buf)
+{
+	struct awcc_priv *priv = dev_get_drvdata(dev);
+	int index = to_sensor_dev_attr(attr)->index;
+	struct awcc_fan_data *fan = priv->fan_data[index];
+	u32 boost;
+	int ret;
+
+	ret = awcc_op_get_fan_boost(priv->wdev, fan->id, &boost);
+	if (ret)
+		return ret;
+
+	return sysfs_emit(buf, "%u\n", boost);
+}
+
+static ssize_t fan_boost_store(struct device *dev, struct device_attribute *attr,
+			       const char *buf, size_t count)
+{
+	struct awcc_priv *priv = dev_get_drvdata(dev);
+	int index = to_sensor_dev_attr(attr)->index;
+	struct awcc_fan_data *fan = priv->fan_data[index];
+	unsigned long val;
+	int ret;
+
+	ret = kstrtoul(buf, 0, &val);
+	if (ret)
+		return ret;
+
+	ret = awcc_op_set_fan_boost(priv->wdev, fan->id, clamp_val(val, 0, 255));
+
+	return ret ? ret : count;
+}
+
+static SENSOR_DEVICE_ATTR_RW(fan1_boost, fan_boost, 0);
+static SENSOR_DEVICE_ATTR_RW(fan2_boost, fan_boost, 1);
+static SENSOR_DEVICE_ATTR_RW(fan3_boost, fan_boost, 2);
+static SENSOR_DEVICE_ATTR_RW(fan4_boost, fan_boost, 3);
+static SENSOR_DEVICE_ATTR_RW(fan5_boost, fan_boost, 4);
+static SENSOR_DEVICE_ATTR_RW(fan6_boost, fan_boost, 5);
+
+static umode_t fan_boost_attr_visible(struct kobject *kobj, struct attribute *attr, int n)
+{
+	struct awcc_priv *priv = dev_get_drvdata(kobj_to_dev(kobj));
+
+	return n < priv->fan_count ? attr->mode : 0;
+}
+
+static bool fan_boost_group_visible(struct kobject *kobj)
+{
+	return true;
+}
+
+DEFINE_SYSFS_GROUP_VISIBLE(fan_boost);
+
+static struct attribute *fan_boost_attrs[] = {
+	&sensor_dev_attr_fan1_boost.dev_attr.attr,
+	&sensor_dev_attr_fan2_boost.dev_attr.attr,
+	&sensor_dev_attr_fan3_boost.dev_attr.attr,
+	&sensor_dev_attr_fan4_boost.dev_attr.attr,
+	&sensor_dev_attr_fan5_boost.dev_attr.attr,
+	&sensor_dev_attr_fan6_boost.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group fan_boost_group = {
+	.attrs = fan_boost_attrs,
+	.is_visible = SYSFS_GROUP_VISIBLE(fan_boost),
+};
+
+static const struct attribute_group *awcc_hwmon_groups[] = {
+	&fan_boost_group,
+	NULL
+};
+
 static int awcc_hwmon_temps_init(struct wmi_device *wdev)
 {
 	struct awcc_priv *priv = dev_get_drvdata(&wdev->dev);
@@ -954,12 +1061,56 @@ static int awcc_hwmon_init(struct wmi_device *wdev)
 	if (ret)
 		return ret;
 
-	priv->hwdev = devm_hwmon_device_register_with_info(&wdev->dev, "alienware_wmi", priv,
-							   &awcc_hwmon_chip_info, NULL);
+	priv->hwdev = devm_hwmon_device_register_with_info(&wdev->dev, "alienware_wmi",
+							   priv, &awcc_hwmon_chip_info,
+							   awcc_hwmon_groups);
 
 	return PTR_ERR_OR_ZERO(priv->hwdev);
 }
 
+static void awcc_hwmon_suspend(struct device *dev)
+{
+	struct awcc_priv *priv = dev_get_drvdata(dev);
+	struct awcc_fan_data *fan;
+	unsigned int i;
+	u32 boost;
+	int ret;
+
+	for (i = 0; i < priv->fan_count; i++) {
+		fan = priv->fan_data[i];
+
+		ret = awcc_thermal_information(priv->wdev, AWCC_OP_GET_FAN_BOOST,
+					       fan->id, &boost);
+		if (ret)
+			dev_err(dev, "Failed to store Fan %u boost while suspending\n", i);
+
+		fan->suspend_cache = ret ? 0 : clamp_val(boost, 0, 255);
+
+		awcc_op_set_fan_boost(priv->wdev, fan->id, 0);
+		if (ret)
+			dev_err(dev, "Failed to set Fan %u boost to 0 while suspending\n", i);
+	}
+}
+
+static void awcc_hwmon_resume(struct device *dev)
+{
+	struct awcc_priv *priv = dev_get_drvdata(dev);
+	struct awcc_fan_data *fan;
+	unsigned int i;
+	int ret;
+
+	for (i = 0; i < priv->fan_count; i++) {
+		fan = priv->fan_data[i];
+
+		if (!fan->suspend_cache)
+			continue;
+
+		ret = awcc_op_set_fan_boost(priv->wdev, fan->id, fan->suspend_cache);
+		if (ret)
+			dev_err(dev, "Failed to restore Fan %u boost while resuming\n", i);
+	}
+}
+
 /*
  * Thermal Profile control
  *  - Provides thermal profile control through the Platform Profile API
@@ -1189,6 +1340,24 @@ static int wmax_wmi_probe(struct wmi_device *wdev, const void *context)
 	return ret;
 }
 
+static int wmax_wmi_suspend(struct device *dev)
+{
+	if (awcc->hwmon)
+		awcc_hwmon_suspend(dev);
+
+	return 0;
+}
+
+static int wmax_wmi_resume(struct device *dev)
+{
+	if (awcc->hwmon)
+		awcc_hwmon_resume(dev);
+
+	return 0;
+}
+
+DEFINE_SIMPLE_DEV_PM_OPS(wmax_wmi_pm_ops, wmax_wmi_suspend, wmax_wmi_resume);
+
 static const struct wmi_device_id alienware_wmax_device_id_table[] = {
 	{ WMAX_CONTROL_GUID, NULL },
 	{ },
@@ -1199,6 +1368,7 @@ static struct wmi_driver alienware_wmax_wmi_driver = {
 	.driver = {
 		.name = "alienware-wmi-wmax",
 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+		.pm = pm_sleep_ptr(&wmax_wmi_pm_ops),
 	},
 	.id_table = alienware_wmax_device_id_table,
 	.probe = wmax_wmi_probe,

-- 
2.48.1

Re: [PATCH v4 08/12] platform/x86: alienware-wmi-wmax: Add support for manual fan control

[Armin Wolf]

Am 08.03.25 um 21:23 schrieb Kurt Borja:

> All models with the "AWCC" WMAX device support a way of manually
> controlling fans.
>
> The PWM duty cycle of a fan can't be controlled directly. Instead the
> AWCC interface let's us tune a fan `boost` value, which has the
> following empirically discovered, aproximate behavior over the PWM
> value:
>
> 	pwm = pwm_base + (fan_boost / 255) * (pwm_max - pwm_base)
>
> Where the pwm_base is the locked PWM value controlled by the FW and
> fan_boost is a value between 0 and 255.
>
> Expose this fan_boost knob as a custom HWMON attribute.

Reviewed-by: Armin Wolf <W_Armin@gmx.de>

>
> Cc: Guenter Roeck <linux@roeck-us.net>
> Cc: Jean Delvare <jdelvare@suse.com>
> Cc: linux-hwmon@vger.kernel.org
> Signed-off-by: Kurt Borja <kuurtb@gmail.com>
> ---
>   drivers/platform/x86/dell/alienware-wmi-wmax.c | 174 ++++++++++++++++++++++++-
>   1 file changed, 172 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/platform/x86/dell/alienware-wmi-wmax.c b/drivers/platform/x86/dell/alienware-wmi-wmax.c
> index f1f20db206d47f644e8cd58a6d169c850606e75b..68ff520f016d2d567cddcefe41f01bf284b4d979 100644
> --- a/drivers/platform/x86/dell/alienware-wmi-wmax.c
> +++ b/drivers/platform/x86/dell/alienware-wmi-wmax.c
> @@ -13,8 +13,12 @@
>   #include <linux/bits.h>
>   #include <linux/dmi.h>
>   #include <linux/hwmon.h>
> +#include <linux/hwmon-sysfs.h>
> +#include <linux/kstrtox.h>
> +#include <linux/minmax.h>
>   #include <linux/moduleparam.h>
>   #include <linux/platform_profile.h>
> +#include <linux/pm.h>
>   #include <linux/units.h>
>   #include <linux/wmi.h>
>   #include "alienware-wmi.h"
> @@ -181,10 +185,12 @@ enum AWCC_THERMAL_INFORMATION_OPERATIONS {
>   	AWCC_OP_GET_FAN_MIN_RPM			= 0x08,
>   	AWCC_OP_GET_FAN_MAX_RPM			= 0x09,
>   	AWCC_OP_GET_CURRENT_PROFILE		= 0x0B,
> +	AWCC_OP_GET_FAN_BOOST			= 0x0C,
>   };
>
>   enum AWCC_THERMAL_CONTROL_OPERATIONS {
>   	AWCC_OP_ACTIVATE_PROFILE		= 0x01,
> +	AWCC_OP_SET_FAN_BOOST			= 0x02,
>   };
>
>   enum AWCC_GAME_SHIFT_STATUS_OPERATIONS {
> @@ -248,6 +254,7 @@ struct awcc_fan_data {
>   	const char *label;
>   	u32 min_rpm;
>   	u32 max_rpm;
> +	u8 suspend_cache;
>   	u8 id;
>   };
>
> @@ -628,6 +635,18 @@ static inline int awcc_op_get_temperature(struct wmi_device *wdev, u8 temp_id, u
>   	return __awcc_wmi_command(wdev, AWCC_METHOD_THERMAL_INFORMATION, &args, out);
>   }
>
> +static inline int awcc_op_get_fan_boost(struct wmi_device *wdev, u8 fan_id, u32 *out)
> +{
> +	struct wmax_u32_args args = {
> +		.operation = AWCC_OP_GET_FAN_BOOST,
> +		.arg1 = fan_id,
> +		.arg2 = 0,
> +		.arg3 = 0,
> +	};
> +
> +	return __awcc_wmi_command(wdev, AWCC_METHOD_THERMAL_INFORMATION, &args, out);
> +}
> +
>   static inline int awcc_op_get_current_profile(struct wmi_device *wdev, u32 *out)
>   {
>   	struct wmax_u32_args args = {
> @@ -653,6 +672,19 @@ static inline int awcc_op_activate_profile(struct wmi_device *wdev, u8 profile)
>   	return __awcc_wmi_command(wdev, AWCC_METHOD_THERMAL_CONTROL, &args, &out);
>   }
>
> +static inline int awcc_op_set_fan_boost(struct wmi_device *wdev, u8 fan_id, u8 boost)
> +{
> +	struct wmax_u32_args args = {
> +		.operation = AWCC_OP_SET_FAN_BOOST,
> +		.arg1 = fan_id,
> +		.arg2 = boost,
> +		.arg3 = 0,
> +	};
> +	u32 out;
> +
> +	return __awcc_wmi_command(wdev, AWCC_METHOD_THERMAL_CONTROL, &args, &out);
> +}
> +
>   /*
>    * HWMON
>    *  - Provides temperature and fan speed monitoring as well as manual fan
> @@ -817,6 +849,81 @@ static const struct hwmon_chip_info awcc_hwmon_chip_info = {
>   	.info = awcc_hwmon_info,
>   };
>
> +static ssize_t fan_boost_show(struct device *dev, struct device_attribute *attr,
> +			      char *buf)
> +{
> +	struct awcc_priv *priv = dev_get_drvdata(dev);
> +	int index = to_sensor_dev_attr(attr)->index;
> +	struct awcc_fan_data *fan = priv->fan_data[index];
> +	u32 boost;
> +	int ret;
> +
> +	ret = awcc_op_get_fan_boost(priv->wdev, fan->id, &boost);
> +	if (ret)
> +		return ret;
> +
> +	return sysfs_emit(buf, "%u\n", boost);
> +}
> +
> +static ssize_t fan_boost_store(struct device *dev, struct device_attribute *attr,
> +			       const char *buf, size_t count)
> +{
> +	struct awcc_priv *priv = dev_get_drvdata(dev);
> +	int index = to_sensor_dev_attr(attr)->index;
> +	struct awcc_fan_data *fan = priv->fan_data[index];
> +	unsigned long val;
> +	int ret;
> +
> +	ret = kstrtoul(buf, 0, &val);
> +	if (ret)
> +		return ret;
> +
> +	ret = awcc_op_set_fan_boost(priv->wdev, fan->id, clamp_val(val, 0, 255));
> +
> +	return ret ? ret : count;
> +}
> +
> +static SENSOR_DEVICE_ATTR_RW(fan1_boost, fan_boost, 0);
> +static SENSOR_DEVICE_ATTR_RW(fan2_boost, fan_boost, 1);
> +static SENSOR_DEVICE_ATTR_RW(fan3_boost, fan_boost, 2);
> +static SENSOR_DEVICE_ATTR_RW(fan4_boost, fan_boost, 3);
> +static SENSOR_DEVICE_ATTR_RW(fan5_boost, fan_boost, 4);
> +static SENSOR_DEVICE_ATTR_RW(fan6_boost, fan_boost, 5);
> +
> +static umode_t fan_boost_attr_visible(struct kobject *kobj, struct attribute *attr, int n)
> +{
> +	struct awcc_priv *priv = dev_get_drvdata(kobj_to_dev(kobj));
> +
> +	return n < priv->fan_count ? attr->mode : 0;
> +}
> +
> +static bool fan_boost_group_visible(struct kobject *kobj)
> +{
> +	return true;
> +}
> +
> +DEFINE_SYSFS_GROUP_VISIBLE(fan_boost);
> +
> +static struct attribute *fan_boost_attrs[] = {
> +	&sensor_dev_attr_fan1_boost.dev_attr.attr,
> +	&sensor_dev_attr_fan2_boost.dev_attr.attr,
> +	&sensor_dev_attr_fan3_boost.dev_attr.attr,
> +	&sensor_dev_attr_fan4_boost.dev_attr.attr,
> +	&sensor_dev_attr_fan5_boost.dev_attr.attr,
> +	&sensor_dev_attr_fan6_boost.dev_attr.attr,
> +	NULL
> +};
> +
> +static const struct attribute_group fan_boost_group = {
> +	.attrs = fan_boost_attrs,
> +	.is_visible = SYSFS_GROUP_VISIBLE(fan_boost),
> +};
> +
> +static const struct attribute_group *awcc_hwmon_groups[] = {
> +	&fan_boost_group,
> +	NULL
> +};
> +
>   static int awcc_hwmon_temps_init(struct wmi_device *wdev)
>   {
>   	struct awcc_priv *priv = dev_get_drvdata(&wdev->dev);
> @@ -954,12 +1061,56 @@ static int awcc_hwmon_init(struct wmi_device *wdev)
>   	if (ret)
>   		return ret;
>
> -	priv->hwdev = devm_hwmon_device_register_with_info(&wdev->dev, "alienware_wmi", priv,
> -							   &awcc_hwmon_chip_info, NULL);
> +	priv->hwdev = devm_hwmon_device_register_with_info(&wdev->dev, "alienware_wmi",
> +							   priv, &awcc_hwmon_chip_info,
> +							   awcc_hwmon_groups);
>
>   	return PTR_ERR_OR_ZERO(priv->hwdev);
>   }
>
> +static void awcc_hwmon_suspend(struct device *dev)
> +{
> +	struct awcc_priv *priv = dev_get_drvdata(dev);
> +	struct awcc_fan_data *fan;
> +	unsigned int i;
> +	u32 boost;
> +	int ret;
> +
> +	for (i = 0; i < priv->fan_count; i++) {
> +		fan = priv->fan_data[i];
> +
> +		ret = awcc_thermal_information(priv->wdev, AWCC_OP_GET_FAN_BOOST,
> +					       fan->id, &boost);
> +		if (ret)
> +			dev_err(dev, "Failed to store Fan %u boost while suspending\n", i);
> +
> +		fan->suspend_cache = ret ? 0 : clamp_val(boost, 0, 255);
> +
> +		awcc_op_set_fan_boost(priv->wdev, fan->id, 0);
> +		if (ret)
> +			dev_err(dev, "Failed to set Fan %u boost to 0 while suspending\n", i);
> +	}
> +}
> +
> +static void awcc_hwmon_resume(struct device *dev)
> +{
> +	struct awcc_priv *priv = dev_get_drvdata(dev);
> +	struct awcc_fan_data *fan;
> +	unsigned int i;
> +	int ret;
> +
> +	for (i = 0; i < priv->fan_count; i++) {
> +		fan = priv->fan_data[i];
> +
> +		if (!fan->suspend_cache)
> +			continue;
> +
> +		ret = awcc_op_set_fan_boost(priv->wdev, fan->id, fan->suspend_cache);
> +		if (ret)
> +			dev_err(dev, "Failed to restore Fan %u boost while resuming\n", i);
> +	}
> +}
> +
>   /*
>    * Thermal Profile control
>    *  - Provides thermal profile control through the Platform Profile API
> @@ -1189,6 +1340,24 @@ static int wmax_wmi_probe(struct wmi_device *wdev, const void *context)
>   	return ret;
>   }
>
> +static int wmax_wmi_suspend(struct device *dev)
> +{
> +	if (awcc->hwmon)
> +		awcc_hwmon_suspend(dev);
> +
> +	return 0;
> +}
> +
> +static int wmax_wmi_resume(struct device *dev)
> +{
> +	if (awcc->hwmon)
> +		awcc_hwmon_resume(dev);
> +
> +	return 0;
> +}
> +
> +DEFINE_SIMPLE_DEV_PM_OPS(wmax_wmi_pm_ops, wmax_wmi_suspend, wmax_wmi_resume);
> +
>   static const struct wmi_device_id alienware_wmax_device_id_table[] = {
>   	{ WMAX_CONTROL_GUID, NULL },
>   	{ },
> @@ -1199,6 +1368,7 @@ static struct wmi_driver alienware_wmax_wmi_driver = {
>   	.driver = {
>   		.name = "alienware-wmi-wmax",
>   		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
> +		.pm = pm_sleep_ptr(&wmax_wmi_pm_ops),
>   	},
>   	.id_table = alienware_wmax_device_id_table,
>   	.probe = wmax_wmi_probe,
>

Re: [PATCH v4 00/12] platform/x86: alienware-wmi-wmax: HWMON support + DebugFS + Improvements

[Guenter Roeck]

On 3/8/25 12:23, Kurt Borja wrote:
> Hi all,
> 
> This set mainly adds hwmon and manual fan control support (patches 7-8)
> to the alienware-wmi driver, after some improvements.
> 
> I have a question for anyone that may know how to solve it. In version 2
> of these series the kernel test robot found a build error
> 
> 	https://lore.kernel.org/platform-driver-x86/202503051819.bQ9P70Og-lkp@intel.com/
> 
> I think this happened because
> 
> 	CONFIG_ALIENWARE_WMI=y
> 
> while
> 
> 	CONFIG_ACPI_PLATFORM_PROFILE=m
> 	CONFIG_HWMON=m
> 
> How should I Kconfig to avoid this?
> 

If hwmon is considered to be mandatory, you'll need
	depends on HWMON=y

Alternative would be to use
	depends on HWMON=y || HWMON=n

and use IS_ENABLED(). Something like

	if (IS_ENABLED(CONFIG_HWMON) && awcc->hwmon) {
		ret = awcc_hwmon_init(wdev);
		if (ret)
			return ret;
	}

Using IS_REACHABLE() would be another option.

The CONFIG_ACPI_PLATFORM_PROFILE problem is probably similar. You can not
have CONFIG_ALIENWARE_WMI as boolean depending on code which can be built
as module.

Guenter

Re: [PATCH v4 00/12] platform/x86: alienware-wmi-wmax: HWMON support + DebugFS + Improvements

[Kurt Borja]

Hi Guenter,

On Sat Mar 8, 2025 at 4:23 PM -05, Guenter Roeck wrote:
> On 3/8/25 12:23, Kurt Borja wrote:
>> Hi all,
>> 
>> This set mainly adds hwmon and manual fan control support (patches 7-8)
>> to the alienware-wmi driver, after some improvements.
>> 
>> I have a question for anyone that may know how to solve it. In version 2
>> of these series the kernel test robot found a build error
>> 
>> 	https://lore.kernel.org/platform-driver-x86/202503051819.bQ9P70Og-lkp@intel.com/
>> 
>> I think this happened because
>> 
>> 	CONFIG_ALIENWARE_WMI=y
>> 
>> while
>> 
>> 	CONFIG_ACPI_PLATFORM_PROFILE=m
>> 	CONFIG_HWMON=m
>> 
>> How should I Kconfig to avoid this?
>> 
>
> If hwmon is considered to be mandatory, you'll need
> 	depends on HWMON=y
>
> Alternative would be to use
> 	depends on HWMON=y || HWMON=n
>
> and use IS_ENABLED(). Something like
>
> 	if (IS_ENABLED(CONFIG_HWMON) && awcc->hwmon) {
> 		ret = awcc_hwmon_init(wdev);
> 		if (ret)
> 			return ret;
> 	}
>
> Using IS_REACHABLE() would be another option.

Oh - Now I understand why I saw this pattern in a few drivers. I'll
think about this option for the next revision.

>
> The CONFIG_ACPI_PLATFORM_PROFILE problem is probably similar. You can not
> have CONFIG_ALIENWARE_WMI as boolean depending on code which can be built
> as module.

Actually ALIENWARE_WMI is tristate, but the symbol that actually pulls
the dependency is ALIENWARE_WMI_WMAX, which is indeed bool.

Thank you, this gave me the clue to fix the issue!

-- 
 ~ Kurt

>
> Guenter