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