1 files changed, 94 insertions, 0 deletions
diff --git a/drivers/hid/intel-thc-hid/intel-thc/intel-thc-wot.c b/drivers/hid/intel-thc-hid/intel-thc/intel-thc-wot.c
new file mode 100644
index 000000000000..1291b4ea2cd8
--- /dev/null
+++ b/drivers/hid/intel-thc-hid/intel-thc/intel-thc-wot.c
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2025 Intel Corporation */
+
+#include <linux/acpi.h>
+#include <linux/pm_wakeirq.h>
+
+#include "intel-thc-dev.h"
+#include "intel-thc-wot.h"
+
+/**
+ * thc_wot_config - Query and configure wake-on-touch feature
+ * @thc_dev: Point to thc_device structure
+ * @gpio_map: Point to ACPI GPIO resource mapping structure
+ *
+ * THC ACPI device only provides _CRS with GpioInt() resources, doesn't contain
+ * _DSD to map this GPIO resource, so this function first registers wake GPIO
+ * mapping manually, then queries wake-on-touch GPIO resource from ACPI,
+ * if it exists and is wake-able, configure driver to enable it, otherwise,
+ * return immediately.
+ * This function will not return error as it doesn't impact major function.
+ */
+void thc_wot_config(struct thc_device *thc_dev, const struct acpi_gpio_mapping *gpio_map)
+{
+	struct acpi_device *adev;
+	struct thc_wot *wot;
+	int ret;
+
+	if (!thc_dev)
+		return;
+
+	adev = ACPI_COMPANION(thc_dev->dev);
+	if (!adev)
+		return;
+
+	wot = &thc_dev->wot;
+
+	ret = acpi_dev_add_driver_gpios(adev, gpio_map);
+	if (ret) {
+		dev_warn(thc_dev->dev, "Can't add wake GPIO resource, ret = %d\n", ret);
+		return;
+	}
+
+	wot->gpio_irq = acpi_dev_gpio_irq_wake_get_by(adev, "wake-on-touch", 0,
+						      &wot->gpio_irq_wakeable);
+	if (wot->gpio_irq <= 0) {
+		dev_warn(thc_dev->dev, "Can't find wake GPIO resource\n");
+		return;
+	}
+
+	if (!wot->gpio_irq_wakeable) {
+		dev_warn(thc_dev->dev, "GPIO resource isn't wakeable\n");
+		return;
+	}
+
+	ret = device_init_wakeup(thc_dev->dev, true);
+	if (ret) {
+		dev_warn(thc_dev->dev, "Failed to init wake up.\n");
+		return;
+	}
+
+	ret = dev_pm_set_dedicated_wake_irq(thc_dev->dev, wot->gpio_irq);
+	if (ret) {
+		dev_warn(thc_dev->dev, "Failed to set wake up IRQ.\n");
+		device_init_wakeup(thc_dev->dev, false);
+	}
+}
+EXPORT_SYMBOL_NS_GPL(thc_wot_config, "INTEL_THC");
+
+/**
+ * thc_wot_unconfig - Unconfig wake-on-touch feature
+ * @thc_dev: Point to thc_device structure
+ *
+ * Configure driver to disable wake-on-touch and release ACPI resource.
+ */
+void thc_wot_unconfig(struct thc_device *thc_dev)
+{
+	struct acpi_device *adev;
+
+	if (!thc_dev)
+		return;
+
+	adev = ACPI_COMPANION(thc_dev->dev);
+	if (!adev)
+		return;
+
+	if (thc_dev->wot.gpio_irq_wakeable)
+		device_init_wakeup(thc_dev->dev, false);
+
+	if (thc_dev->wot.gpio_irq > 0) {
+		dev_pm_clear_wake_irq(thc_dev->dev);
+		acpi_dev_remove_driver_gpios(adev);
+	}
+}
+EXPORT_SYMBOL_NS_GPL(thc_wot_unconfig, "INTEL_THC");