gentoo-linux-surface-overlay/dev-libs/libwacom-surface/files/v2/0002-Add-support-for-Intel-Management-Engine-bus.patch

From b8dae24b8f4bf24c3d1aeccc3efef81fc0f8b08d Mon Sep 17 00:00:00 2001
From: Maximilian Luz <luzmaximilian@gmail.com>
Date: Sat, 1 Jun 2019 21:17:15 +0200
Subject: [PATCH 02/16] Add support for Intel Management Engine bus

Add support for devices connected via the Intel Management Engine (MEI).
This is required to support IPTS based devices, such as (among others)
the Microsoft Surface Books, Surface Pro 5 and 6, and Surface Laptops.
---
 libwacom/libwacom-database.c | 4 ++++
 libwacom/libwacom.c          | 5 +++++
 libwacom/libwacom.h          | 1 +
 test/test-tablet-validity.c  | 1 +
 test/test_data_files.py      | 1 +
 tools/debug-device.c         | 1 +
 6 files changed, 13 insertions(+)

diff --git a/libwacom/libwacom-database.c b/libwacom/libwacom-database.c
index c5e2fcf..d9fc0c4 100644
--- a/libwacom/libwacom-database.c
+++ b/libwacom/libwacom-database.c
@@ -132,6 +132,8 @@ bus_from_str (const char *str)
 		return WBUSTYPE_I2C;
 	if (g_str_equal(str, "virt"))
 		return WBUSTYPE_VIRTUAL;
+	if (strcmp (str, "mei") == 0)
+		return WBUSTYPE_MEI;
 	return WBUSTYPE_UNKNOWN;
 }
 
@@ -152,6 +154,8 @@ bus_to_str (WacomBusType bus)
 		return "i2c";
 	case WBUSTYPE_VIRTUAL:
 		return "virt";
+	case WBUSTYPE_MEI:
+		return "mei";
 	}
 	g_assert_not_reached ();
 }
diff --git a/libwacom/libwacom.c b/libwacom/libwacom.c
index c028bde..0d34227 100644
--- a/libwacom/libwacom.c
+++ b/libwacom/libwacom.c
@@ -153,6 +153,10 @@ get_bus_vid_pid (GUdevDevice  *device,
 		*bus = WBUSTYPE_VIRTUAL;
 		retval = TRUE;
 		break;
+	case 68:
+		*bus = WBUSTYPE_MEI;
+		retval = TRUE;
+		break;
 	}
 
 out:
@@ -1027,6 +1031,7 @@ static void print_match(int fd, const WacomMatch *match)
 		case WBUSTYPE_SERIAL:		bus_name = "serial";	break;
 		case WBUSTYPE_I2C:		bus_name = "i2c";	break;
 		case WBUSTYPE_VIRTUAL:		bus_name = "virt";	break;
+		case WBUSTYPE_MEI:		bus_name = "mei";	break;
 		case WBUSTYPE_UNKNOWN:		bus_name = "unknown";	break;
 		default:			g_assert_not_reached(); break;
 	}
diff --git a/libwacom/libwacom.h b/libwacom/libwacom.h
index a4fbb17..dfc6d7b 100644
--- a/libwacom/libwacom.h
+++ b/libwacom/libwacom.h
@@ -155,6 +155,7 @@ typedef enum {
 	WBUSTYPE_BLUETOOTH,	/**< Bluetooth tablet */
 	WBUSTYPE_I2C,		/**< I2C tablet */
 	WBUSTYPE_VIRTUAL,	/**< Virtual (uinput) tablet */
+	WBUSTYPE_MEI,		/**< MEI */
 } WacomBusType;
 
 /**
diff --git a/test/test-tablet-validity.c b/test/test-tablet-validity.c
index 964fce0..5178583 100644
--- a/test/test-tablet-validity.c
+++ b/test/test-tablet-validity.c
@@ -178,6 +178,7 @@ assert_vidpid(WacomBusType bus, int vid, int pid)
 		case WBUSTYPE_BLUETOOTH:
 		case WBUSTYPE_I2C:
 		case WBUSTYPE_VIRTUAL:
+		case WBUSTYPE_MEI:
 			g_assert_cmpint(vid, >, 0);
 			g_assert_cmpint(pid, >, 0);
 			break;
diff --git a/test/test_data_files.py b/test/test_data_files.py
index f76c3f3..f7cf9bc 100755
--- a/test/test_data_files.py
+++ b/test/test_data_files.py
@@ -48,6 +48,7 @@ def test_device_match(tabletfile):
             "i2c",
             "serial",
             "virt",
+            "mei",
         ], f"{tabletfile}: unknown bus type"
         assert re.match(
             "[0-9a-f]{4}", vid
diff --git a/tools/debug-device.c b/tools/debug-device.c
index 51ec53e..6a00f9d 100644
--- a/tools/debug-device.c
+++ b/tools/debug-device.c
@@ -123,6 +123,7 @@ handle_device(WacomDeviceDatabase *db, const char *path)
 			case WBUSTYPE_BLUETOOTH: busstr = "BLUETOOTH"; break;
 			case WBUSTYPE_I2C: busstr = "I2C"; break;
 			case WBUSTYPE_VIRTUAL: busstr = "VIRTUAL"; break;
+			case WBUSTYPE_MEI: busstr = "MEI"; break;
 		}
 		func(libwacom_get_bustype, "%s", busstr);
 	}
-- 
2.45.1