intel-thc-wot.c

 1// SPDX-License-Identifier: GPL-2.0
 2/* Copyright (c) 2025 Intel Corporation */
 3
 4#include <linux/acpi.h>
 5#include <linux/pm_wakeirq.h>
 6
 7#include "intel-thc-dev.h"
 8#include "intel-thc-wot.h"
 9
10/**
11 * thc_wot_config - Query and configure wake-on-touch feature
12 * @thc_dev: Point to thc_device structure
13 * @gpio_map: Point to ACPI GPIO resource mapping structure
14 *
15 * THC ACPI device only provides _CRS with GpioInt() resources, doesn't contain
16 * _DSD to map this GPIO resource, so this function first registers wake GPIO
17 * mapping manually, then queries wake-on-touch GPIO resource from ACPI,
18 * if it exists and is wake-able, configure driver to enable it, otherwise,
19 * return immediately.
20 * This function will not return error as it doesn't impact major function.
21 */
22void thc_wot_config(struct thc_device *thc_dev, const struct acpi_gpio_mapping *gpio_map)
23{
24	struct acpi_device *adev;
25	struct thc_wot *wot;
26	int ret;
27
28	if (!thc_dev)
29		return;
30
31	adev = ACPI_COMPANION(thc_dev->dev);
32	if (!adev)
33		return;
34
35	wot = &thc_dev->wot;
36
37	ret = acpi_dev_add_driver_gpios(adev, gpio_map);
38	if (ret) {
39		dev_warn(thc_dev->dev, "Can't add wake GPIO resource, ret = %d\n", ret);
40		return;
41	}
42
43	wot->gpio_irq = acpi_dev_gpio_irq_wake_get_by(adev, "wake-on-touch", 0,
44						      &wot->gpio_irq_wakeable);
45	if (wot->gpio_irq <= 0) {
46		dev_warn(thc_dev->dev, "Can't find wake GPIO resource\n");
47		return;
48	}
49
50	if (!wot->gpio_irq_wakeable) {
51		dev_warn(thc_dev->dev, "GPIO resource isn't wakeable\n");
52		return;
53	}
54
55	ret = device_init_wakeup(thc_dev->dev, true);
56	if (ret) {
57		dev_warn(thc_dev->dev, "Failed to init wake up.\n");
58		return;
59	}
60
61	ret = dev_pm_set_dedicated_wake_irq(thc_dev->dev, wot->gpio_irq);
62	if (ret) {
63		dev_warn(thc_dev->dev, "Failed to set wake up IRQ.\n");
64		device_init_wakeup(thc_dev->dev, false);
65	}
66}
67EXPORT_SYMBOL_NS_GPL(thc_wot_config, "INTEL_THC");
68
69/**
70 * thc_wot_unconfig - Unconfig wake-on-touch feature
71 * @thc_dev: Point to thc_device structure
72 *
73 * Configure driver to disable wake-on-touch and release ACPI resource.
74 */
75void thc_wot_unconfig(struct thc_device *thc_dev)
76{
77	struct acpi_device *adev;
78
79	if (!thc_dev)
80		return;
81
82	adev = ACPI_COMPANION(thc_dev->dev);
83	if (!adev)
84		return;
85
86	if (thc_dev->wot.gpio_irq_wakeable)
87		device_init_wakeup(thc_dev->dev, false);
88
89	if (thc_dev->wot.gpio_irq > 0) {
90		dev_pm_clear_wake_irq(thc_dev->dev);
91		acpi_dev_remove_driver_gpios(adev);
92	}
93}
94EXPORT_SYMBOL_NS_GPL(thc_wot_unconfig, "INTEL_THC");