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_L), {
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_L), {
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 }