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/* SPDX-License-Identifier: GPL-2.0-only */
#define PEPD_DSM_UUID "e3f32452-febc-43ce-9039-932122d37721"
#define PEPD_DSM_LPI_ENUM_FUNCTIONS 0
#define PEPD_DSM_LPI_ADDITIONAL_FUNCTIONS 1
#define PEPD_DSM_LPI_GET_DEVICE_CONSTRAINTS 1
#define PEPD_DSM_NOTIFICATIONS_UUID "11e00d56-ce64-47ce-837b-1f898f9aa461"
#define PEPD_DSM_NOTIFICATION_ENUM_FUNCTIONS 0
/*
* Power Engine Plug-in Device
*
* References:
* * Intel Low Power S0 Idle
* * AMD Modern Standby BIOS Implementation Guide - #56358
* * Linux Kernel: drivers/acpi/x86/s2idle.c
* * https://docs.microsoft.com/en-us/windows-hardware/design/device-experiences/modern-standby-firmware-notifications
*/
Scope (\_SB) {
Device (PEP) {
Name (_HID, "AMDI0005")
Name (_CID, EisaId ("PNP0D80"))
Name (_UID, One)
Method (_STA, 0, NotSerialized) {
Return (0x0F)
}
/*
* Device constraints for low power states (may be used for debugging).
* For now there is only one disabled dummy device, because Windows
* expects at least one device and crashes without it with a bluescreen
* (`INTERNAL_POWER_ERROR`). Returning an empty package does not work.
*/
Name (DEVL, Package() {
0,
1, /* Only 1 dummy device for now */
Package() {
Package() {
0, /* Disabled */
"\\DUMY", /* \DUMY - not existent */
0, /* Function States */
0 /* Minimum D-state */
}
}
})
/*
* PEPD_DSM_UUID Helper method
*
* Arg0: Function Index
*/
Method (DSM0, 1, Serialized) {
Switch (ToInteger(Arg0)) {
/*
* Return a bit field of the supported functions for
* this UUID.
*/
Case (PEPD_DSM_LPI_ENUM_FUNCTIONS) {
Local0 = Buffer { 0x00 }
CreateByteField(Local0, 0x00, SUPP)
SUPP = PEPD_DSM_LPI_ADDITIONAL_FUNCTIONS
SUPP |= 1 << PEPD_DSM_LPI_GET_DEVICE_CONSTRAINTS
Return (Local0)
}
Case (PEPD_DSM_LPI_GET_DEVICE_CONSTRAINTS) {
Return (DEVL)
}
Default {
/* Unknown function */
Return (Buffer() { 0x00 })
}
}
}
/*
* PEPD_DSM_NOTIFICATIONS_UUID Helper method
*
* Arg0: Function Index
*/
Method (DSM1, 1, Serialized) {
Switch (ToInteger(Arg0)) {
/*
* Return a bit field of the supported functions for
* this UUID.
*/
Case (PEPD_DSM_NOTIFICATION_ENUM_FUNCTIONS) {
/*
* TODO(b/185586290): Add additional functions when
* linux kernel driver is fixed.
*/
Return (Buffer() { 0x00 })
}
Default {
/* Unknown function */
Return (Buffer() { 0x00 })
}
}
}
/*
* Device Specific Method
*
* Arg0: UUID
* Arg1: Revision Id
* Arg2: Function Index
*/
Method (_DSM, 4, Serialized) {
Switch (ToBuffer(Arg0)) {
Case (ToUUID(PEPD_DSM_UUID)) {
/* Unsupported Revision */
If (ToInteger(Arg1) != 0) {
Return (Buffer() { 0x00 })
}
Return (DSM0(Arg2))
}
Case (ToUUID(PEPD_DSM_NOTIFICATIONS_UUID)) {
/* Unsupported Revision */
If (ToInteger(Arg1) != 0) {
Return (Buffer() { 0x00 })
}
Return (DSM1(Arg2))
}
Default {
Return (Buffer { 0x00 })
}
}
}
}
}
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