1*1bb76ff1Sjsg // SPDX-License-Identifier: MIT
2*1bb76ff1Sjsg /*
3*1bb76ff1Sjsg * Copyright (C) 2020 Red Hat, Inc.
4*1bb76ff1Sjsg *
5*1bb76ff1Sjsg * Authors:
6*1bb76ff1Sjsg * Hans de Goede <hdegoede@redhat.com>
7*1bb76ff1Sjsg */
8*1bb76ff1Sjsg
9*1bb76ff1Sjsg #include <linux/acpi.h>
10*1bb76ff1Sjsg #include <drm/drm_privacy_screen_machine.h>
11*1bb76ff1Sjsg
12*1bb76ff1Sjsg #ifdef CONFIG_X86
13*1bb76ff1Sjsg static struct drm_privacy_screen_lookup arch_lookup;
14*1bb76ff1Sjsg
15*1bb76ff1Sjsg struct arch_init_data {
16*1bb76ff1Sjsg struct drm_privacy_screen_lookup lookup;
17*1bb76ff1Sjsg bool (*detect)(void);
18*1bb76ff1Sjsg };
19*1bb76ff1Sjsg
20*1bb76ff1Sjsg #if IS_ENABLED(CONFIG_THINKPAD_ACPI)
acpi_set_handle(acpi_handle handle,u32 level,void * context,void ** return_value)21*1bb76ff1Sjsg static acpi_status __init acpi_set_handle(acpi_handle handle, u32 level,
22*1bb76ff1Sjsg void *context, void **return_value)
23*1bb76ff1Sjsg {
24*1bb76ff1Sjsg *(acpi_handle *)return_value = handle;
25*1bb76ff1Sjsg return AE_CTRL_TERMINATE;
26*1bb76ff1Sjsg }
27*1bb76ff1Sjsg
detect_thinkpad_privacy_screen(void)28*1bb76ff1Sjsg static bool __init detect_thinkpad_privacy_screen(void)
29*1bb76ff1Sjsg {
30*1bb76ff1Sjsg union acpi_object obj = { .type = ACPI_TYPE_INTEGER };
31*1bb76ff1Sjsg struct acpi_object_list args = { .count = 1, .pointer = &obj, };
32*1bb76ff1Sjsg acpi_handle ec_handle = NULL;
33*1bb76ff1Sjsg unsigned long long output;
34*1bb76ff1Sjsg acpi_status status;
35*1bb76ff1Sjsg
36*1bb76ff1Sjsg if (acpi_disabled)
37*1bb76ff1Sjsg return false;
38*1bb76ff1Sjsg
39*1bb76ff1Sjsg /* Get embedded-controller handle */
40*1bb76ff1Sjsg status = acpi_get_devices("PNP0C09", acpi_set_handle, NULL, &ec_handle);
41*1bb76ff1Sjsg if (ACPI_FAILURE(status) || !ec_handle)
42*1bb76ff1Sjsg return false;
43*1bb76ff1Sjsg
44*1bb76ff1Sjsg /* And call the privacy-screen get-status method */
45*1bb76ff1Sjsg status = acpi_evaluate_integer(ec_handle, "HKEY.GSSS", &args, &output);
46*1bb76ff1Sjsg if (ACPI_FAILURE(status))
47*1bb76ff1Sjsg return false;
48*1bb76ff1Sjsg
49*1bb76ff1Sjsg return (output & 0x10000) ? true : false;
50*1bb76ff1Sjsg }
51*1bb76ff1Sjsg #endif
52*1bb76ff1Sjsg
53*1bb76ff1Sjsg #if IS_ENABLED(CONFIG_CHROMEOS_PRIVACY_SCREEN)
detect_chromeos_privacy_screen(void)54*1bb76ff1Sjsg static bool __init detect_chromeos_privacy_screen(void)
55*1bb76ff1Sjsg {
56*1bb76ff1Sjsg return acpi_dev_present("GOOG0010", NULL, -1);
57*1bb76ff1Sjsg }
58*1bb76ff1Sjsg #endif
59*1bb76ff1Sjsg
60*1bb76ff1Sjsg static const struct arch_init_data arch_init_data[] __initconst = {
61*1bb76ff1Sjsg #if IS_ENABLED(CONFIG_THINKPAD_ACPI)
62*1bb76ff1Sjsg {
63*1bb76ff1Sjsg .lookup = {
64*1bb76ff1Sjsg .dev_id = NULL,
65*1bb76ff1Sjsg .con_id = NULL,
66*1bb76ff1Sjsg .provider = "privacy_screen-thinkpad_acpi",
67*1bb76ff1Sjsg },
68*1bb76ff1Sjsg .detect = detect_thinkpad_privacy_screen,
69*1bb76ff1Sjsg },
70*1bb76ff1Sjsg #endif
71*1bb76ff1Sjsg #if IS_ENABLED(CONFIG_CHROMEOS_PRIVACY_SCREEN)
72*1bb76ff1Sjsg {
73*1bb76ff1Sjsg .lookup = {
74*1bb76ff1Sjsg .dev_id = NULL,
75*1bb76ff1Sjsg .con_id = NULL,
76*1bb76ff1Sjsg .provider = "privacy_screen-GOOG0010:00",
77*1bb76ff1Sjsg },
78*1bb76ff1Sjsg .detect = detect_chromeos_privacy_screen,
79*1bb76ff1Sjsg },
80*1bb76ff1Sjsg #endif
81*1bb76ff1Sjsg };
82*1bb76ff1Sjsg
drm_privacy_screen_lookup_init(void)83*1bb76ff1Sjsg void __init drm_privacy_screen_lookup_init(void)
84*1bb76ff1Sjsg {
85*1bb76ff1Sjsg int i;
86*1bb76ff1Sjsg
87*1bb76ff1Sjsg for (i = 0; i < ARRAY_SIZE(arch_init_data); i++) {
88*1bb76ff1Sjsg if (!arch_init_data[i].detect())
89*1bb76ff1Sjsg continue;
90*1bb76ff1Sjsg
91*1bb76ff1Sjsg pr_info("Found '%s' privacy-screen provider\n",
92*1bb76ff1Sjsg arch_init_data[i].lookup.provider);
93*1bb76ff1Sjsg
94*1bb76ff1Sjsg /* Make a copy because arch_init_data is __initconst */
95*1bb76ff1Sjsg arch_lookup = arch_init_data[i].lookup;
96*1bb76ff1Sjsg drm_privacy_screen_lookup_add(&arch_lookup);
97*1bb76ff1Sjsg break;
98*1bb76ff1Sjsg }
99*1bb76ff1Sjsg }
100*1bb76ff1Sjsg
drm_privacy_screen_lookup_exit(void)101*1bb76ff1Sjsg void drm_privacy_screen_lookup_exit(void)
102*1bb76ff1Sjsg {
103*1bb76ff1Sjsg if (arch_lookup.provider)
104*1bb76ff1Sjsg drm_privacy_screen_lookup_remove(&arch_lookup);
105*1bb76ff1Sjsg }
106*1bb76ff1Sjsg #endif /* ifdef CONFIG_X86 */
107