Commit 3d4ca763 authored by Armin Wolf's avatar Armin Wolf Committed by Rafael J. Wysocki
Browse files

ACPI: fan: Add hwmon notification support 



The platform firmware can notify the ACPI fan device that the fan
speed has changed. Relay this notification to the hwmon device if
present so that userspace applications can react to it.

Signed-off-by: default avatarArmin Wolf <W_Armin@gmx.de>
Link: https://patch.msgid.link/20251024183824.5656-3-W_Armin@gmx.de


Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 0670b9ad

drivers/acpi/fan.h

+5 −0
Original line number Diff line number Diff line
@@ -56,6 +56,9 @@ struct acpi_fan { 
	struct acpi_fan_fif fif;

	struct acpi_fan_fps *fps;

	int fps_count;

#if IS_REACHABLE(CONFIG_HWMON)

	struct device *hdev;

#endif

	struct thermal_cooling_device *cdev;

	struct device_attribute fst_speed;

	struct device_attribute fine_grain_control;
@@ -99,8 +102,10 @@ void acpi_fan_delete_attributes(struct acpi_device *device); 


#if IS_REACHABLE(CONFIG_HWMON)

int devm_acpi_fan_create_hwmon(struct device *dev);

void acpi_fan_notify_hwmon(struct device *dev);

#else

static inline int devm_acpi_fan_create_hwmon(struct device *dev) { return 0; };

static inline void acpi_fan_notify_hwmon(struct device *dev) { };

#endif



#endif

drivers/acpi/fan_core.c

+1 −0
Original line number Diff line number Diff line
@@ -326,6 +326,7 @@ static void acpi_fan_notify_handler(acpi_handle handle, u32 event, void *context 
		if (ret < 0)

			dev_err(dev, "Error retrieving current fan status: %d\n", ret);



		acpi_fan_notify_hwmon(dev);

		acpi_bus_generate_netlink_event("fan", dev_name(dev), event, 0);

		break;

	default:

drivers/acpi/fan_hwmon.c

+11 −4
Original line number Diff line number Diff line
@@ -162,12 +162,19 @@ static const struct hwmon_chip_info acpi_fan_hwmon_chip_info = { 
	.info = acpi_fan_hwmon_info,

};



void acpi_fan_notify_hwmon(struct device *dev)

{

	struct acpi_fan *fan = dev_get_drvdata(dev);



	hwmon_notify_event(fan->hdev, hwmon_fan, hwmon_fan_input, 0);

}



int devm_acpi_fan_create_hwmon(struct device *dev)

{

	struct acpi_fan *fan = dev_get_drvdata(dev);

	struct device *hdev;



	hdev = devm_hwmon_device_register_with_info(dev, "acpi_fan", fan, &acpi_fan_hwmon_chip_info,

						    NULL);

	return PTR_ERR_OR_ZERO(hdev);

	fan->hdev = devm_hwmon_device_register_with_info(dev, "acpi_fan", fan,

							 &acpi_fan_hwmon_chip_info, NULL);



	return PTR_ERR_OR_ZERO(fan->hdev);

}