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 */
 36struct 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
 52static 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 20170221 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	 * Unfortunately the GPD pocket also uses these strings and its BIOS
 81	 * was copy-pasted from the GPD win, so it has a disabled KIOX000A
 82	 * node which we should not enable, thus we also check the BIOS date.
 83	 */
 84	ENTRY("KIOX000A", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT), {
 85		DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
 86		DMI_MATCH(DMI_BOARD_NAME, "Default string"),
 87		DMI_MATCH(DMI_PRODUCT_NAME, "Default string"),
 88		DMI_MATCH(DMI_BIOS_DATE, "02/21/2017")
 89	      }),
 90	ENTRY("KIOX000A", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT), {
 91		DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
 92		DMI_MATCH(DMI_BOARD_NAME, "Default string"),
 93		DMI_MATCH(DMI_PRODUCT_NAME, "Default string"),
 94		DMI_MATCH(DMI_BIOS_DATE, "03/20/2017")
 95	      }),
 96	ENTRY("KIOX000A", "1", ICPU(INTEL_FAM6_ATOM_AIRMONT), {
 97		DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
 98		DMI_MATCH(DMI_BOARD_NAME, "Default string"),
 99		DMI_MATCH(DMI_PRODUCT_NAME, "Default string"),
100		DMI_MATCH(DMI_BIOS_DATE, "05/25/2017")
101	      }),
102};
103
104bool acpi_device_always_present(struct acpi_device *adev)
105{
106	u32 *status = (u32 *)&adev->status;
107	u32 old_status = *status;
108	bool ret = false;
109	unsigned int i;
110
111	/* acpi_match_device_ids checks status, so set it to default */
112	*status = ACPI_STA_DEFAULT;
113	for (i = 0; i < ARRAY_SIZE(always_present_ids); i++) {
114		if (acpi_match_device_ids(adev, always_present_ids[i].hid))
115			continue;
116
117		if (!adev->pnp.unique_id ||
118		    strcmp(adev->pnp.unique_id, always_present_ids[i].uid))
119			continue;
120
121		if (!x86_match_cpu(always_present_ids[i].cpu_ids))
122			continue;
123
124		if (always_present_ids[i].dmi_ids[0].matches[0].slot &&
125		    !dmi_check_system(always_present_ids[i].dmi_ids))
126			continue;
127
128		if (old_status != ACPI_STA_DEFAULT) /* Log only once */
129			dev_info(&adev->dev,
130				 "Device [%s] is in always present list\n",
131				 adev->pnp.bus_id);
132
133		ret = true;
134		break;
135	}
136	*status = old_status;
137
138	return ret;
139}