[M] Change in coreboot[master]: src/drivers/spi: add HID over SPI ACPI driver - WIP

[Eran Mitrani (Code Review)]

Eran Mitrani has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/71645 )

Change subject: src/drivers/spi: add HID over SPI ACPI driver - WIP
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src/drivers/spi: add HID over SPI ACPI driver - WIP

Add driver to support ELAN touchscreen using SPI

Signed-off-by: Eran Mitrani 
Change-Id: Ided6c20da7e5489b9fa32c622f1424e3aba14dd3
---
A src/drivers/spi/hid/elan/elan7b18uh.asl
1 file changed, 114 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/45/71645/1

diff --git a/src/drivers/spi/hid/elan/elan7b18uh.asl b/src/drivers/spi/hid/elan/elan7b18uh.asl
new file mode 100644
index 0000000..d91f7c3
--- /dev/null
+++ b/src/drivers/spi/hid/elan/elan7b18uh.asl
@@ -0,0 +1,102 @@
+// ELAN7B18UH - HID over SPI
+// - see "HID Over SPI Protocol Specification" section 5.2 - ACPI enum
+// https://www.microsoft.com/en-us/download/details.aspx?id=103325
+
+// FIXME - WIP - most fields need to be updated based on ENAN spec
+Scope (_SB) {
+	Device(TCSC) {
+		Name (_HID, "ELAN7B18UH”)	// FIXME VendorID + DeviceID - <VVVVdddd>
+		Name (_CID, "PNP0C51")		// Compatible ID - PNP0C50 or PNP0C51 ?
+		Name (_SUB, "???")		// SubVendorID + SubSystemID - <VVVVssss>
+		Name (_HRV, 0x0000)		// Hardware Revision Number - 2 bytes
+
+ 		Name (_CRS, ResourceTemplate () {
+			SpiSerialBusV2 (
+				0,			// DeviceSelection
+				PolarityLow,		// DeviceSelectionPolarity
+				FourWireMode,		// WireMode
+				8,			// DataBitLength
+				ControllerInitiated,	// SlaveMode
+				1000000,		// ConnectionSpeed (1MHz)
+				ClockPolarityLow,	// ClockPolarity
+				ClockPhaseFirst,	// ClockPhase
+				"\_SB.PCI0.SPI0",	// ResourceSource
+				0,			// ResourceSourceIndex
+				ResourceConsumer,	// ResourceUsage
+			)
+			GpioInt (
+				Level,			// InterruptType
+				ActiveLow,		// InterruptLevel
+				Exclusive,		// ShareType
+				PullUp,			// PinConfig
+				0x0000,			// DeBounceTime
+				"\_SB.GPO0",		// ResourceSource
+				0x00,			// ResourceSourceIndex
+				ResourceConsumer,	// ResourceUsage
+			)
+			{
+				00 // Which INT#?
+			}
+		}
+		// _DSM - Device-Specific Method
+		//
+		// Arg0: UUID Unique function identifier
+		// Arg1: Integer Revision ID – Will be 3 for HidSpi V1
+		// Arg2: Integer Function Index (0 = Return Supported Functions)
+		// Arg3: Package Parameters
+		//
+		Function(_DSM,{BuffObj, IntObj},{BuffObj, IntObj, IntObj, PkgObj}){
+			// HIDSPI UUID
+			If(LEqual(Arg0,ToUUID("6E2AC436-0FCF-41AF-A265-B32A220DCFAB"))) {
+
+				// Switch on the function index
+				switch(Arg2) {
+					case(0) {
+					// Switch on the revision level
+						switch(ToInteger(Arg1)) {
+							case (3) {
+								// HidSpi v1 : Functions 0-6 inclusive are supported (0b01111111)
+								Return(Buffer(One) { 0x7F })
+							}
+							default {
+								// Unsupported revision
+								Return(Buffer(One) { 0x00 })
+							}
+						}
+					}
+					case(1) {
+						// Input Report Header address
+						Return (0x1000)
+					}
+					case(2) {
+						// Input Report Body address
+						Return (0x1004)
+					}
+					case(3) {
+						// Output Report Header address
+						Return (0x2000)
+					}
+					case(4) {
+						// Read opcode
+						Return (Buffer(1) {0x0B})
+					}
+					case(5) {
+						// Write opcode
+						Return (Buffer(1) {0x02})
+					}
+					case(6) {
+						// Flags
+						Return (0x0000)
+					}
+					default {
+						// Unsupported function index
+					}
+				}
+			}
+			else {
+				// No functions are supported for this UUID.
+				return (Buffer() {0})
+			}
+		}
+	Function(_RST) {} // Placeholder for function-level device reset
+}