2 * X86 ACPI Utility Functions
4 * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
6 * Based on various non upstream patches to support the CHT Whiskey Cove PMIC:
7 * Copyright (C) 2013-2015 Intel Corporation. All rights reserved.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include <linux/acpi.h>
15 #include <asm/cpu_device_id.h>
16 #include <asm/intel-family.h>
17 #include "../internal.h"
20 * Some ACPI devices are hidden (status == 0x0) in recent BIOS-es because
21 * some recent Windows drivers bind to one device but poke at multiple
22 * devices at the same time, so the others get hidden.
23 * We work around this by always reporting ACPI_STA_DEFAULT for these
24 * devices. Note this MUST only be done for devices where this is safe.
26 * This forcing of devices to be present is limited to specific CPU (SoC)
27 * models both to avoid potentially causing trouble on other models and
28 * because some HIDs are re-used on different SoCs for completely
31 struct always_present_id {
32 struct acpi_device_id hid[2];
33 struct x86_cpu_id cpu_ids[2];
37 #define ICPU(model) { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, }
39 #define ENTRY(hid, uid, cpu_models) { \
45 static const struct always_present_id always_present_ids[] = {
47 * Bay / Cherry Trail PWM directly poked by GPU driver in win10,
48 * but Linux uses a separate PWM driver, harmless if not used.
50 ENTRY("80860F09", "1", ICPU(INTEL_FAM6_ATOM_SILVERMONT1)),
51 ENTRY("80862288", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT)),
53 * The INT0002 device is necessary to clear wakeup interrupt sources
54 * on Cherry Trail devices, without it we get nobody cared IRQ msgs.
56 ENTRY("INT0002", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT)),
59 bool acpi_device_always_present(struct acpi_device *adev)
61 u32 *status = (u32 *)&adev->status;
62 u32 old_status = *status;
66 /* acpi_match_device_ids checks status, so set it to default */
67 *status = ACPI_STA_DEFAULT;
68 for (i = 0; i < ARRAY_SIZE(always_present_ids); i++) {
69 if (acpi_match_device_ids(adev, always_present_ids[i].hid))
72 if (!adev->pnp.unique_id ||
73 strcmp(adev->pnp.unique_id, always_present_ids[i].uid))
76 if (!x86_match_cpu(always_present_ids[i].cpu_ids))
79 if (old_status != ACPI_STA_DEFAULT) /* Log only once */
81 "Device [%s] is in always present list\n",