1befe5404SHans de Goede // SPDX-License-Identifier: MIT
2befe5404SHans de Goede /*
3befe5404SHans de Goede * Copyright (C) 2020 Red Hat, Inc.
4befe5404SHans de Goede *
5befe5404SHans de Goede * Authors:
6befe5404SHans de Goede * Hans de Goede <hdegoede@redhat.com>
7befe5404SHans de Goede */
8befe5404SHans de Goede
9befe5404SHans de Goede #include <linux/acpi.h>
10befe5404SHans de Goede #include <drm/drm_privacy_screen_machine.h>
11befe5404SHans de Goede
12befe5404SHans de Goede #ifdef CONFIG_X86
13befe5404SHans de Goede static struct drm_privacy_screen_lookup arch_lookup;
14befe5404SHans de Goede
15befe5404SHans de Goede struct arch_init_data {
16befe5404SHans de Goede struct drm_privacy_screen_lookup lookup;
17befe5404SHans de Goede bool (*detect)(void);
18befe5404SHans de Goede };
19befe5404SHans de Goede
20befe5404SHans de Goede #if IS_ENABLED(CONFIG_THINKPAD_ACPI)
acpi_set_handle(acpi_handle handle,u32 level,void * context,void ** return_value)21befe5404SHans de Goede static acpi_status __init acpi_set_handle(acpi_handle handle, u32 level,
22befe5404SHans de Goede void *context, void **return_value)
23befe5404SHans de Goede {
24befe5404SHans de Goede *(acpi_handle *)return_value = handle;
25befe5404SHans de Goede return AE_CTRL_TERMINATE;
26befe5404SHans de Goede }
27befe5404SHans de Goede
detect_thinkpad_privacy_screen(void)28befe5404SHans de Goede static bool __init detect_thinkpad_privacy_screen(void)
29befe5404SHans de Goede {
30befe5404SHans de Goede union acpi_object obj = { .type = ACPI_TYPE_INTEGER };
31befe5404SHans de Goede struct acpi_object_list args = { .count = 1, .pointer = &obj, };
32befe5404SHans de Goede acpi_handle ec_handle = NULL;
33befe5404SHans de Goede unsigned long long output;
34befe5404SHans de Goede acpi_status status;
35befe5404SHans de Goede
36*7fde14d7STong Zhang if (acpi_disabled)
37*7fde14d7STong Zhang return false;
38*7fde14d7STong Zhang
39befe5404SHans de Goede /* Get embedded-controller handle */
40befe5404SHans de Goede status = acpi_get_devices("PNP0C09", acpi_set_handle, NULL, &ec_handle);
41befe5404SHans de Goede if (ACPI_FAILURE(status) || !ec_handle)
42befe5404SHans de Goede return false;
43befe5404SHans de Goede
44befe5404SHans de Goede /* And call the privacy-screen get-status method */
45befe5404SHans de Goede status = acpi_evaluate_integer(ec_handle, "HKEY.GSSS", &args, &output);
46befe5404SHans de Goede if (ACPI_FAILURE(status))
47befe5404SHans de Goede return false;
48befe5404SHans de Goede
49befe5404SHans de Goede return (output & 0x10000) ? true : false;
50befe5404SHans de Goede }
51befe5404SHans de Goede #endif
52befe5404SHans de Goede
53befe5404SHans de Goede #if IS_ENABLED(CONFIG_CHROMEOS_PRIVACY_SCREEN)
detect_chromeos_privacy_screen(void)54befe5404SHans de Goede static bool __init detect_chromeos_privacy_screen(void)
55befe5404SHans de Goede {
56befe5404SHans de Goede return acpi_dev_present("GOOG0010", NULL, -1);
57befe5404SHans de Goede }
58befe5404SHans de Goede #endif
59befe5404SHans de Goede
60befe5404SHans de Goede static const struct arch_init_data arch_init_data[] __initconst = {
61befe5404SHans de Goede #if IS_ENABLED(CONFIG_THINKPAD_ACPI)
62befe5404SHans de Goede {
63befe5404SHans de Goede .lookup = {
64befe5404SHans de Goede .dev_id = NULL,
65befe5404SHans de Goede .con_id = NULL,
66befe5404SHans de Goede .provider = "privacy_screen-thinkpad_acpi",
67befe5404SHans de Goede },
68befe5404SHans de Goede .detect = detect_thinkpad_privacy_screen,
69befe5404SHans de Goede },
70befe5404SHans de Goede #endif
71befe5404SHans de Goede #if IS_ENABLED(CONFIG_CHROMEOS_PRIVACY_SCREEN)
72befe5404SHans de Goede {
73befe5404SHans de Goede .lookup = {
74befe5404SHans de Goede .dev_id = NULL,
75befe5404SHans de Goede .con_id = NULL,
76befe5404SHans de Goede .provider = "privacy_screen-GOOG0010:00",
77befe5404SHans de Goede },
78befe5404SHans de Goede .detect = detect_chromeos_privacy_screen,
79befe5404SHans de Goede },
80befe5404SHans de Goede #endif
81befe5404SHans de Goede };
82befe5404SHans de Goede
drm_privacy_screen_lookup_init(void)83befe5404SHans de Goede void __init drm_privacy_screen_lookup_init(void)
84befe5404SHans de Goede {
85befe5404SHans de Goede int i;
86befe5404SHans de Goede
87befe5404SHans de Goede for (i = 0; i < ARRAY_SIZE(arch_init_data); i++) {
88befe5404SHans de Goede if (!arch_init_data[i].detect())
89befe5404SHans de Goede continue;
90
91 pr_info("Found '%s' privacy-screen provider\n",
92 arch_init_data[i].lookup.provider);
93
94 /* Make a copy because arch_init_data is __initconst */
95 arch_lookup = arch_init_data[i].lookup;
96 drm_privacy_screen_lookup_add(&arch_lookup);
97 break;
98 }
99 }
100
drm_privacy_screen_lookup_exit(void)101 void drm_privacy_screen_lookup_exit(void)
102 {
103 if (arch_lookup.provider)
104 drm_privacy_screen_lookup_remove(&arch_lookup);
105 }
106 #endif /* ifdef CONFIG_X86 */
107