drivers/acpi/x86/utils.c

   1 /*
   2  * X86 ACPI Utility Functions
   3  *
   4  * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
   5  *
   6  * Based on various non upstream patches to support the CHT Whiskey Cove PMIC:
   7  * Copyright (C) 2013-2015 Intel Corporation. All rights reserved.
   8  *
   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.
  12  */
  13
  14 #include <linux/acpi.h>
  15 #include <linux/dmi.h>
  16 #include <asm/cpu_device_id.h>
  17 #include <asm/intel-family.h>
  18 #include "../internal.h"
  19
  20 /*
  21  * Some ACPI devices are hidden (status == 0x0) in recent BIOS-es because
  22  * some recent Windows drivers bind to one device but poke at multiple
  23  * devices at the same time, so the others get hidden.
  24  *
  25  * Some BIOS-es (temporarily) hide specific APCI devices to work around Windows
  26  * driver bugs. We use DMI matching to match known cases of this.
  27  *
  28  * We work around this by always reporting ACPI_STA_DEFAULT for these
  29  * devices. Note this MUST only be done for devices where this is safe.
  30  *
  31  * This forcing of devices to be present is limited to specific CPU (SoC)
  32  * models both to avoid potentially causing trouble on other models and
  33  * because some HIDs are re-used on different SoCs for completely
  34  * different devices.
  35  */
  36 struct always_present_id {
  37         struct acpi_device_id hid[2];
  38         struct x86_cpu_id cpu_ids[2];
  39         struct dmi_system_id dmi_ids[2]; /* Optional */
  40         const char *uid;
  41 };
  42
  43 #define ICPU(model)     { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, }
  44
  45 #define ENTRY(hid, uid, cpu_models, dmi...) {                           \
  46         { { hid, }, {} },                                               \
  47         { cpu_models, {} },                                             \
  48         { { .matches = dmi }, {} },                                     \
  49         uid,                                                            \
  50 }
  51
  52 static const struct always_present_id always_present_ids[] = {
  53         /*
  54          * Bay / Cherry Trail PWM directly poked by GPU driver in win10,
  55          * but Linux uses a separate PWM driver, harmless if not used.
  56          */
  57         ENTRY("80860F09", "1", ICPU(INTEL_FAM6_ATOM_SILVERMONT1), {}),
  58         ENTRY("80862288", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT), {}),
  59         /*
  60          * The INT0002 device is necessary to clear wakeup interrupt sources
  61          * on Cherry Trail devices, without it we get nobody cared IRQ msgs.
  62          */
  63         ENTRY("INT0002", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT), {}),
  64         /*
  65          * On the Dell Venue 11 Pro 7130 the DSDT hides the touchscreen ACPI
  66          * device until a certain time after _SB.PCI0.GFX0.LCD.LCD1._ON gets
  67          * called has passed *and* _STA has been called at least 3 times since.
  68          */
  69         ENTRY("SYNA7500", "1", ICPU(INTEL_FAM6_HASWELL_ULT), {
  70                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
  71                 DMI_MATCH(DMI_PRODUCT_NAME, "Venue 11 Pro 7130"),
  72               }),
  73         /*
  74          * The GPD win BIOS dated 20170320 has disabled the accelerometer, the
  75          * drivers sometimes cause crashes under Windows and this is how the
  76          * manufacturer has solved this :| Note that the the DMI data is less
  77          * generic then it seems, a board_vendor of "AMI Corporation" is quite
  78          * rare and a board_name of "Default String" also is rare.
  79          */
  80         ENTRY("KIOX000A", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT), {
  81                 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
  82                 DMI_MATCH(DMI_BOARD_NAME, "Default string"),
  83                 DMI_MATCH(DMI_PRODUCT_NAME, "Default string"),
  84                 DMI_MATCH(DMI_BIOS_DATE, "03/20/2017")
  85               }),
  86 };
  87
  88 bool acpi_device_always_present(struct acpi_device *adev)
  89 {
  90         u32 *status = (u32 *)&adev->status;
  91         u32 old_status = *status;
  92         bool ret = false;
  93         unsigned int i;
  94
  95         /* acpi_match_device_ids checks status, so set it to default */
  96         *status = ACPI_STA_DEFAULT;
  97         for (i = 0; i < ARRAY_SIZE(always_present_ids); i++) {
  98                 if (acpi_match_device_ids(adev, always_present_ids[i].hid))
  99                         continue;
 100
 101                 if (!adev->pnp.unique_id ||
 102                     strcmp(adev->pnp.unique_id, always_present_ids[i].uid))
 103                         continue;
 104
 105                 if (!x86_match_cpu(always_present_ids[i].cpu_ids))
 106                         continue;
 107
 108                 if (always_present_ids[i].dmi_ids[0].matches[0].slot &&
 109                     !dmi_check_system(always_present_ids[i].dmi_ids))
 110                         continue;
 111
 112                 if (old_status != ACPI_STA_DEFAULT) /* Log only once */
 113                         dev_info(&adev->dev,
 114                                  "Device [%s] is in always present list\n",
 115                                  adev->pnp.bus_id);
 116
 117                 ret = true;
 118                 break;
 119         }
 120         *status = old_status;
 121
 122         return ret;
 123 }