mirror of https://gitee.com/openkylin/linux.git
91 lines
2.7 KiB
C
91 lines
2.7 KiB
C
/*
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* X86 ACPI Utility Functions
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*
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* Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
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*
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* Based on various non upstream patches to support the CHT Whiskey Cove PMIC:
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* Copyright (C) 2013-2015 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/acpi.h>
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#include <asm/cpu_device_id.h>
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#include <asm/intel-family.h>
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#include "../internal.h"
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/*
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* Some ACPI devices are hidden (status == 0x0) in recent BIOS-es because
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* some recent Windows drivers bind to one device but poke at multiple
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* devices at the same time, so the others get hidden.
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* We work around this by always reporting ACPI_STA_DEFAULT for these
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* devices. Note this MUST only be done for devices where this is safe.
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*
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* This forcing of devices to be present is limited to specific CPU (SoC)
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* models both to avoid potentially causing trouble on other models and
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* because some HIDs are re-used on different SoCs for completely
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* different devices.
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*/
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struct always_present_id {
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struct acpi_device_id hid[2];
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struct x86_cpu_id cpu_ids[2];
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const char *uid;
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};
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#define ICPU(model) { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, }
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#define ENTRY(hid, uid, cpu_models) { \
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{ { hid, }, {} }, \
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{ cpu_models, {} }, \
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uid, \
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}
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static const struct always_present_id always_present_ids[] = {
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/*
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* Bay / Cherry Trail PWM directly poked by GPU driver in win10,
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* but Linux uses a separate PWM driver, harmless if not used.
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*/
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ENTRY("80860F09", "1", ICPU(INTEL_FAM6_ATOM_SILVERMONT1)),
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ENTRY("80862288", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT)),
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/*
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* The INT0002 device is necessary to clear wakeup interrupt sources
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* on Cherry Trail devices, without it we get nobody cared IRQ msgs.
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*/
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ENTRY("INT0002", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT)),
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};
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bool acpi_device_always_present(struct acpi_device *adev)
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{
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u32 *status = (u32 *)&adev->status;
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u32 old_status = *status;
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bool ret = false;
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unsigned int i;
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/* acpi_match_device_ids checks status, so set it to default */
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*status = ACPI_STA_DEFAULT;
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for (i = 0; i < ARRAY_SIZE(always_present_ids); i++) {
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if (acpi_match_device_ids(adev, always_present_ids[i].hid))
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continue;
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if (!adev->pnp.unique_id ||
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strcmp(adev->pnp.unique_id, always_present_ids[i].uid))
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continue;
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if (!x86_match_cpu(always_present_ids[i].cpu_ids))
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continue;
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if (old_status != ACPI_STA_DEFAULT) /* Log only once */
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dev_info(&adev->dev,
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"Device [%s] is in always present list\n",
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adev->pnp.bus_id);
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ret = true;
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break;
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}
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*status = old_status;
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return ret;
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}
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