projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| befe5404 HG |
1 | // SPDX-License-Identifier: MIT |
| 2 | /* | |
| 3 | * Copyright (C) 2020 Red Hat, Inc. | |
| 4 | * | |
| 5 | * Authors: | |
| 6 | * Hans de Goede <hdegoede@redhat.com> | |
| 7 | */ | |
| 8 | ||
| 9 | #include <linux/acpi.h> | |
| 10 | #include <drm/drm_privacy_screen_machine.h> | |
| 11 | ||
| 12 | #ifdef CONFIG_X86 | |
| 13 | static struct drm_privacy_screen_lookup arch_lookup; | |
| 14 | ||
| 15 | struct arch_init_data { | |
| 16 | struct drm_privacy_screen_lookup lookup; | |
| 17 | bool (*detect)(void); | |
| 18 | }; | |
| 19 | ||
| 20 | #if IS_ENABLED(CONFIG_THINKPAD_ACPI) | |
| 21 | static acpi_status __init acpi_set_handle(acpi_handle handle, u32 level, | |
| 22 | void *context, void **return_value) | |
| 23 | { | |
| 24 | *(acpi_handle *)return_value = handle; | |
| 25 | return AE_CTRL_TERMINATE; | |
| 26 | } | |
| 27 | ||
| 28 | static bool __init detect_thinkpad_privacy_screen(void) | |
| 29 | { | |
| 30 | union acpi_object obj = { .type = ACPI_TYPE_INTEGER }; | |
| 31 | struct acpi_object_list args = { .count = 1, .pointer = &obj, }; | |
| 32 | acpi_handle ec_handle = NULL; | |
| 33 | unsigned long long output; | |
| 34 | acpi_status status; | |
| 35 | ||
| 7fde14d7 TZ |
36 | if (acpi_disabled) |
| 37 | return false; | |
| 38 | ||
| befe5404 HG |
39 | /* Get embedded-controller handle */ |
| 40 | status = acpi_get_devices("PNP0C09", acpi_set_handle, NULL, &ec_handle); | |
| 41 | if (ACPI_FAILURE(status) || !ec_handle) | |
| 42 | return false; | |
| 43 | ||
| 44 | /* And call the privacy-screen get-status method */ | |
| 45 | status = acpi_evaluate_integer(ec_handle, "HKEY.GSSS", &args, &output); | |
| 46 | if (ACPI_FAILURE(status)) | |
| 47 | return false; | |
| 48 | ||
| 49 | return (output & 0x10000) ? true : false; | |
| 50 | } | |
| 51 | #endif | |
| 52 | ||
| 0af2e827 RJ |
53 | #if IS_ENABLED(CONFIG_CHROMEOS_PRIVACY_SCREEN) |
| 54 | static bool __init detect_chromeos_privacy_screen(void) | |
| 55 | { | |
| 56 | return acpi_dev_present("GOOG0010", NULL, -1); | |
| 57 | } | |
| 58 | #endif | |
| 59 | ||
| befe5404 HG |
60 | static const struct arch_init_data arch_init_data[] __initconst = { |
| 61 | #if IS_ENABLED(CONFIG_THINKPAD_ACPI) | |
| 62 | { | |
| 63 | .lookup = { | |
| 64 | .dev_id = NULL, | |
| 65 | .con_id = NULL, | |
| 66 | .provider = "privacy_screen-thinkpad_acpi", | |
| 67 | }, | |
| 68 | .detect = detect_thinkpad_privacy_screen, | |
| 69 | }, | |
| 70 | #endif | |
| 0af2e827 RJ |
71 | #if IS_ENABLED(CONFIG_CHROMEOS_PRIVACY_SCREEN) |
| 72 | { | |
| 73 | .lookup = { | |
| 74 | .dev_id = NULL, | |
| 75 | .con_id = NULL, | |
| 76 | .provider = "privacy_screen-GOOG0010:00", | |
| 77 | }, | |
| 78 | .detect = detect_chromeos_privacy_screen, | |
| 79 | }, | |
| 80 | #endif | |
| befe5404 HG |
81 | }; |
| 82 | ||
| 83 | void __init drm_privacy_screen_lookup_init(void) | |
| 84 | { | |
| 85 | int i; | |
| 86 | ||
| 87 | for (i = 0; i < ARRAY_SIZE(arch_init_data); i++) { | |
| 88 | if (!arch_init_data[i].detect()) | |
| 89 | 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 | ||
| 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 */ |