[PATCH v3 2/3] ACPI: fan: Add hwmon notification support

[Armin Wolf <W_Armin@gmx.de>]

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 <W_Armin@gmx.de>
---
 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 0d73433c3889..dcc1ad3118ff 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 9ee4ef2d6dbc..7be22c52670c 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 47a02ef5a606..d3374f8f524b 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);
 }
-- 
2.39.5