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 */
 33struct 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 X86_MATCH(model)	X86_MATCH_INTEL_FAM6_MODEL(model, NULL)
 41
 42#define ENTRY(hid, uid, cpu_models, dmi...) {				\
 43	{ { hid, }, {} },						\
 44	{ cpu_models, {} },						\
 45	{ { .matches = dmi }, {} },					\
 46	uid,								\
 47}
 48
 49static 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", X86_MATCH(ATOM_SILVERMONT), {}),
 55	ENTRY("80862288", "1", X86_MATCH(ATOM_AIRMONT), {}),
 56
 57	/* Lenovo Yoga Book uses PWM2 for keyboard backlight control */
 58	ENTRY("80862289", "2", X86_MATCH(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", X86_MATCH(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", X86_MATCH(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", X86_MATCH(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", X86_MATCH(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", X86_MATCH(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", X86_MATCH(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
112bool 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}