From 3d4ca76369782e9a55a6c07d4fdc492f9a731cdb Mon Sep 17 00:00:00 2001 From: Armin Wolf Date: Fri, 24 Oct 2025 20:38:23 +0200 Subject: [PATCH] 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: Armin Wolf Link: https://patch.msgid.link/20251024183824.5656-3-W_Armin@gmx.de Signed-off-by: Rafael J. Wysocki --- drivers/acpi/fan.h | 5 +++++ drivers/acpi/fan_core.c | 1 + drivers/acpi/fan_hwmon.c | 15 +++++++++++---- 3 files changed, 17 insertions(+), 4 deletions(-) diff --git a/drivers/acpi/fan.h b/drivers/acpi/fan.h index 0d73433c38892..dcc1ad3118ff7 100644 --- a/drivers/acpi/fan.h +++ b/drivers/acpi/fan.h @@ -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 diff --git a/drivers/acpi/fan_core.c b/drivers/acpi/fan_core.c index 9ee4ef2d6dbcd..7be22c52670ca 100644 --- a/drivers/acpi/fan_core.c +++ b/drivers/acpi/fan_core.c @@ -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: diff --git a/drivers/acpi/fan_hwmon.c b/drivers/acpi/fan_hwmon.c index 47a02ef5a6067..d3374f8f524b7 100644 --- a/drivers/acpi/fan_hwmon.c +++ b/drivers/acpi/fan_hwmon.c @@ -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); } -- 2.47.3