xref: /openbmc/linux/drivers/acpi/x86/utils.c (revision 57ee11ea)
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 }
124