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// SPDX-License-Identifier: MIT /* * Copyright (C) 2020 Red Hat, Inc. * * Authors: * Hans de Goede <hdegoede@redhat.com> */ #include <linux/acpi.h> #include <drm/drm_privacy_screen_machine.h> #ifdef CONFIG_X86 static struct drm_privacy_screen_lookup arch_lookup; struct arch_init_data { struct drm_privacy_screen_lookup lookup; bool (*detect)(void); }; #if IS_ENABLED(CONFIG_THINKPAD_ACPI) static acpi_status __init acpi_set_handle(acpi_handle handle, u32 level, void *context, void **return_value) { *(acpi_handle *)return_value = handle; return AE_CTRL_TERMINATE; } static bool __init detect_thinkpad_privacy_screen(void) { union acpi_object obj = { .type = ACPI_TYPE_INTEGER }; struct acpi_object_list args = { .count = 1, .pointer = &obj, }; acpi_handle ec_handle = NULL; unsigned long long output; acpi_status status; if (acpi_disabled) return false; /* Get embedded-controller handle */ status = acpi_get_devices("PNP0C09", acpi_set_handle, NULL, &ec_handle); if (ACPI_FAILURE(status) || !ec_handle) return false; /* And call the privacy-screen get-status method */ status = acpi_evaluate_integer(ec_handle, "HKEY.GSSS", &args, &output); if (ACPI_FAILURE(status)) return false; return (output & 0x10000) ? true : false; } #endif #if IS_ENABLED(CONFIG_CHROMEOS_PRIVACY_SCREEN) static bool __init detect_chromeos_privacy_screen(void) { return acpi_dev_present("GOOG0010", NULL, -1); } #endif static const struct arch_init_data arch_init_data[] __initconst = { #if IS_ENABLED(CONFIG_THINKPAD_ACPI) { .lookup = { .dev_id = NULL, .con_id = NULL, .provider = "privacy_screen-thinkpad_acpi", }, .detect = detect_thinkpad_privacy_screen, }, #endif #if IS_ENABLED(CONFIG_CHROMEOS_PRIVACY_SCREEN) { .lookup = { .dev_id = NULL, .con_id = NULL, .provider = "privacy_screen-GOOG0010:00", }, .detect = detect_chromeos_privacy_screen, }, #endif }; void __init drm_privacy_screen_lookup_init(void) { int i; for (i = 0; i < ARRAY_SIZE(arch_init_data); i++) { if (!arch_init_data[i].detect()) continue; pr_info("Found '%s' privacy-screen provider\n", arch_init_data[i].lookup.provider); /* Make a copy because arch_init_data is __initconst */ arch_lookup = arch_init_data[i].lookup; drm_privacy_screen_lookup_add(&arch_lookup); break; } } void drm_privacy_screen_lookup_exit(void) { if (arch_lookup.provider) drm_privacy_screen_lookup_remove(&arch_lookup); } #endif /* ifdef CONFIG_X86 */