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/* SPDX-License-Identifier: GPL-2.0-only */
/* Minimal implementation of HID event filter device for airplane hotkey support */
Device (HIDD)
{
Name (_HID, "INTC1051")
Name (HRDY, 0)
Name (HBSY, 0)
Name (HIDX, 0)
/*
* Workaround:
* There was a bug in Linux' HID driver, making evaluation of function 2 fail.
* The driver falls back to legacy mode and evaluates integers instead of _DSM.
* A bugfix for this was merged to mainline and stable but not LTS-branches. Thus,
* let's keep this for some time.
* https://lore.kernel.org/r/66f813f5bcc724a0f6dd5adefe6a9728dbe509e3.camel@mniewoehner.de
*/
Name (HDMM, 0)
Method (_STA)
{
Return (0x0f)
}
Method (_DSM, 4, Serialized)
{
If (Arg0 == ToUUID ("eeec56b3-4442-408f-a792-4edd4d758054"))
{
If (Arg1 == 1) /* Revision 1 */
{
Printf ("HIDD: _DSM called, fn=%o", ToDecimalString(Arg2))
Switch (ToInteger (Arg2))
{
Case (0)
{
/* Supported functions: 0, 2, 3, 4, 7 */
Return (Buffer () {0x9d, 0x00})
}
Case (2)
{
/* Simple mode */
Return (0)
}
Case (3)
{
/* Driver status */
HRDY = DeRefOf (Index (Arg3, 0))
}
Case (4)
{
/* HID driver calls this to get event */
HBSY = 0
Return (HIDX)
}
Case (7)
{
/* Only airplane mode button implemented */
Return (1 << 1)
}
}
}
}
Return (Buffer () {0})
}
/*
* HID Platform Event Method
* Called to trigger HID event.
*/
Method (HPEM, 1, Serialized)
{
Printf ("HIDD: HPEM called, event=%o", ToHexString (Arg0))
If (!HRDY)
{
Printf ("HIDD: HID driver not ready. Ignoring event.")
}
HBSY = 1
HIDX = Arg0
Notify (HIDD, 0xc0)
/* Wait max. 1 second for HID driver */
Local0 = 0
While ((Local0 < 250) && HBSY)
{
Sleep (4)
Local0++
}
If (HBSY)
{
Printf ("HIDD: HPEM timeout")
HBSY = 0
HIDX = 0
Return (1) /* Timeout */
}
Return (0)
}
}
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