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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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dcb2ccb930
Wake-on-Touch (WoT) feature gives system the capability to wake from sleep state by user touch event, it requires platform providing wake GPIO through ACPI resource. Intel UEFI provides a user setting to enable or disable THC device WoT feature. If it's enabled, UEFI assigns an additional wake GPIO resource to THC device ACPI configuration, facilitating system wakeup. This patch provides helper APIs for THC device driver to query wake GPIO resource, enable WoT feature and unconfigure WoT. APIs added: - thc_wot_config(): Query and configure wake-on-touch feature. - thc_wot_unconfig(): Unconfig wake-on-touch feature. Signed-off-by: Even Xu <even.xu@intel.com> Tested-by: Chong Han <chong.han@intel.com> Signed-off-by: Jiri Kosina <jkosina@suse.com>
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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