1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * X86 ACPI Utility Functions 4 * 5 * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com> 6 * 7 * Based on various non upstream patches to support the CHT Whiskey Cove PMIC: 8 * Copyright (C) 2013-2015 Intel Corporation. All rights reserved. 9 */ 10 11 #include <linux/acpi.h> 12 #include <linux/dmi.h> 13 #include <asm/cpu_device_id.h> 14 #include <asm/intel-family.h> 15 #include "../internal.h" 16 17 /* 18 * Some ACPI devices are hidden (status == 0x0) in recent BIOS-es because 19 * some recent Windows drivers bind to one device but poke at multiple 20 * devices at the same time, so the others get hidden. 21 * 22 * Some BIOS-es (temporarily) hide specific APCI devices to work around Windows 23 * driver bugs. We use DMI matching to match known cases of this. 24 * 25 * We work around this by always reporting ACPI_STA_DEFAULT for these 26 * devices. Note this MUST only be done for devices where this is safe. 27 * 28 * This forcing of devices to be present is limited to specific CPU (SoC) 29 * models both to avoid potentially causing trouble on other models and 30 * because some HIDs are re-used on different SoCs for completely 31 * different devices. 32 */ 33 struct always_present_id { 34 struct acpi_device_id hid[2]; 35 struct x86_cpu_id cpu_ids[2]; 36 struct dmi_system_id dmi_ids[2]; /* Optional */ 37 const char *uid; 38 }; 39 40 #define ICPU(model) { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, } 41 42 #define ENTRY(hid, uid, cpu_models, dmi...) { \ 43 { { hid, }, {} }, \ 44 { cpu_models, {} }, \ 45 { { .matches = dmi }, {} }, \ 46 uid, \ 47 } 48 49 static const struct always_present_id always_present_ids[] = { 50 /* 51 * Bay / Cherry Trail PWM directly poked by GPU driver in win10, 52 * but Linux uses a separate PWM driver, harmless if not used. 53 */ 54 ENTRY("80860F09", "1", ICPU(INTEL_FAM6_ATOM_SILVERMONT), {}), 55 ENTRY("80862288", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT), {}), 56 57 /* Lenovo Yoga Book uses PWM2 for keyboard backlight control */ 58 ENTRY("80862289", "2", ICPU(INTEL_FAM6_ATOM_AIRMONT), { 59 DMI_MATCH(DMI_PRODUCT_NAME, "Lenovo YB1-X9"), 60 }), 61 /* 62 * The INT0002 device is necessary to clear wakeup interrupt sources 63 * on Cherry Trail devices, without it we get nobody cared IRQ msgs. 64 */ 65 ENTRY("INT0002", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT), {}), 66 /* 67 * On the Dell Venue 11 Pro 7130 and 7139, the DSDT hides 68 * the touchscreen ACPI device until a certain time 69 * after _SB.PCI0.GFX0.LCD.LCD1._ON gets called has passed 70 * *and* _STA has been called at least 3 times since. 71 */ 72 ENTRY("SYNA7500", "1", ICPU(INTEL_FAM6_HASWELL_ULT), { 73 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 74 DMI_MATCH(DMI_PRODUCT_NAME, "Venue 11 Pro 7130"), 75 }), 76 ENTRY("SYNA7500", "1", ICPU(INTEL_FAM6_HASWELL_ULT), { 77 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 78 DMI_MATCH(DMI_PRODUCT_NAME, "Venue 11 Pro 7139"), 79 }), 80 81 /* 82 * The GPD win BIOS dated 20170221 has disabled the accelerometer, the 83 * drivers sometimes cause crashes under Windows and this is how the 84 * manufacturer has solved this :| Note that the the DMI data is less 85 * generic then it seems, a board_vendor of "AMI Corporation" is quite 86 * rare and a board_name of "Default String" also is rare. 87 * 88 * Unfortunately the GPD pocket also uses these strings and its BIOS 89 * was copy-pasted from the GPD win, so it has a disabled KIOX000A 90 * node which we should not enable, thus we also check the BIOS date. 91 */ 92 ENTRY("KIOX000A", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT), { 93 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"), 94 DMI_MATCH(DMI_BOARD_NAME, "Default string"), 95 DMI_MATCH(DMI_PRODUCT_NAME, "Default string"), 96 DMI_MATCH(DMI_BIOS_DATE, "02/21/2017") 97 }), 98 ENTRY("KIOX000A", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT), { 99 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"), 100 DMI_MATCH(DMI_BOARD_NAME, "Default string"), 101 DMI_MATCH(DMI_PRODUCT_NAME, "Default string"), 102 DMI_MATCH(DMI_BIOS_DATE, "03/20/2017") 103 }), 104 ENTRY("KIOX000A", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT), { 105 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"), 106 DMI_MATCH(DMI_BOARD_NAME, "Default string"), 107 DMI_MATCH(DMI_PRODUCT_NAME, "Default string"), 108 DMI_MATCH(DMI_BIOS_DATE, "05/25/2017") 109 }), 110 }; 111 112 bool acpi_device_always_present(struct acpi_device *adev) 113 { 114 bool ret = false; 115 unsigned int i; 116 117 for (i = 0; i < ARRAY_SIZE(always_present_ids); i++) { 118 if (acpi_match_device_ids(adev, always_present_ids[i].hid)) 119 continue; 120 121 if (!adev->pnp.unique_id || 122 strcmp(adev->pnp.unique_id, always_present_ids[i].uid)) 123 continue; 124 125 if (!x86_match_cpu(always_present_ids[i].cpu_ids)) 126 continue; 127 128 if (always_present_ids[i].dmi_ids[0].matches[0].slot && 129 !dmi_check_system(always_present_ids[i].dmi_ids)) 130 continue; 131 132 ret = true; 133 break; 134 } 135 136 return ret; 137 } 138