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-rw-r--r--src/mainboard/google/rex/variants/rex0/include/variant/acpi/hid_spi_elan.asl152
1 files changed, 152 insertions, 0 deletions
diff --git a/src/mainboard/google/rex/variants/rex0/include/variant/acpi/hid_spi_elan.asl b/src/mainboard/google/rex/variants/rex0/include/variant/acpi/hid_spi_elan.asl
new file mode 100644
index 0000000000..cc8cb935a5
--- /dev/null
+++ b/src/mainboard/google/rex/variants/rex0/include/variant/acpi/hid_spi_elan.asl
@@ -0,0 +1,152 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/*
+ * 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
+
+ * NOTES:
+ * 1. Make sure TOUCH_SCR_IRQ is defined according to the board's schematics
+ * 2. Include this file under the scope for the correct SPI, e.g.:
+ * Scope (\_SB.PCI0.SPI0)
+ * {
+ * #include <variant/acpi/hid_spi_elan.asl>
+ * }
+ */
+
+Device(TCSC) {
+ Name (_HID, "ELAN9006") /* VendorID + DeviceID - <VVVVdddd> */
+ Name (_CID, "PNP0C51") /* Compatible ID - PNP0C51 */
+ Name (_SUB, "ELAN0732") /* SubVendorID + SubSystemID - <VVVVssss> */
+ Name (_HRV, 0x0001) /* Hardware Revision Number - 2 bytes */
+
+ Method (_STA, 0)
+ {
+ Return (0xf)
+ }
+
+ Name (_CRS, ResourceTemplate () {
+ SpiSerialBusV2 (
+ 0, /* DeviceSelection */
+ PolarityLow, /* DeviceSelectionPolarity */
+ FourWireMode, /* WireMode */
+ 8, /* DataBitLength */
+ ControllerInitiated, /* SlaveMode */
+ 0x0B71B00, /* ConnectionSpeed (12MHz) */
+ ClockPolarityLow, /* ClockPolarity */
+ ClockPhaseFirst, /* ClockPhase */
+ "\\_SB.PCI0.SPI0", /* ResourceSource */
+ 0, /* ResourceSourceIndex */
+ ResourceConsumer, /* ResourceUsage */
+ )
+ Interrupt(ResourceConsumer, Level, ActiveLow, Shared)
+ {
+ TOUCH_SCR_IRQ
+ }
+ })
+
+ /* _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 */
+
+ Method (_DSM, 4) {
+ /* HIDSPI UUID */
+ If(Arg0 == ToUUID("6E2AC436-0FCF-41AF-A265-B32A220DCFAB")) {
+
+ /* Switch on the function index */
+ switch(ToInteger(Arg2)) {
+ case(0) {
+ /* Switch on the revision level */
+ switch(ToInteger(Arg1)) {
+ case (3) {
+ /* HidSpi v1: Functions 0-6 */
+ Return(Buffer(One) { 0x7F })
+ }
+ default {
+ /* Unsupported revision */
+ Return(Buffer(One) { 0x00 })
+ }
+ }
+ }
+ case(1) {
+ /* Elan Input Report Header address - 0x1000*/
+ Return (0x1000)
+ }
+ case(2) {
+ /* Elan Input Report Body address - 0x1100*/
+ Return (0x1100)
+ }
+ case(3) {
+ /* Elan Output Report Header address - 0x2000 */
+ 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 */
+ Return (Buffer() {0})
+ }
+ }
+ }
+ else {
+ /* No functions are supported for this UUID. */
+ return (Buffer() {0})
+ }
+ }
+
+ Method(_RST, 0, Serialized) {
+ /* De-assert the reset signal for 20ms */
+ CTXS(GPP_C01)
+ Sleep(20)
+ STXS(GPP_C01)
+ }
+
+ Name (_PR0, Package (0x01) /* Power Resources for D0 */
+ {
+ PR00
+ })
+
+ Name (_PR3, Package (0x01) /* Power Resources for D3hot */
+ {
+ PR00
+ })
+
+ PowerResource (PR00, 0x00, 0x0000)
+ {
+ Method (_STA, 0, NotSerialized) /* Status */
+ {
+ Return (1)
+ }
+
+ Method (_ON, 0, Serialized) /* Power On */
+ {
+ CTXS (GPP_C01)
+ STXS (GPP_C00)
+ Sleep (1)
+ STXS (GPP_C01)
+ Sleep (20)
+ STXS (GPP_C06)
+ }
+
+ Method (_OFF, 0, Serialized) /* Power Off */
+ {
+ CTXS (GPP_C06)
+ Sleep (2)
+ CTXS (GPP_C01)
+ Sleep (2)
+ CTXS (GPP_C00)
+ }
+ }
+}