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 */
thc_wot_config(struct thc_device * thc_dev,const struct acpi_gpio_mapping * gpio_map)22 void 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 }
67 EXPORT_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 */
thc_wot_unconfig(struct thc_device * thc_dev)75 void 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 }
94 EXPORT_SYMBOL_NS_GPL(thc_wot_unconfig, "INTEL_THC");
95