Add basic uniwill-wmi module

- Add separate uniwill-wmi module
- Add uniwill interfaces header

Makefile

@@ -19,7 +19,8 @@
 obj-m :=	./src/tuxedo_keyboard.o \
 		./src/clevo_wmi.o \
 		./src/clevo_acpi.o \
-		./src/tuxedo_io/tuxedo_io.o
+		./src/tuxedo_io/tuxedo_io.o \
+		./src/uniwill_wmi.o
 
 PWD := $(shell pwd)
 KDIR := /lib/modules/$(shell uname -r)/build

dkms.conf

@@ -17,6 +17,10 @@ DEST_MODULE_LOCATION[3]="/kernel/lib/"
 BUILT_MODULE_NAME[3]="tuxedo_io"
 BUILT_MODULE_LOCATION[3]="src/tuxedo_io"
 
+DEST_MODULE_LOCATION[4]="/kernel/lib/"
+BUILT_MODULE_NAME[4]="uniwill_wmi"
+BUILT_MODULE_LOCATION[4]="src/"
+
 MAKE[0]="make KDIR=/lib/modules/${kernelver}/build"
 CLEAN="make clean"
 AUTOINSTALL="yes"

src/uniwill_interfaces.h

@@ -0,0 +1,29 @@
+/*!
+ * Copyright (c) 2021 TUXEDO Computers GmbH <tux@tuxedocomputers.com>
+ *
+ * This file is part of tuxedo-keyboard.
+ *
+ * tuxedo-keyboard is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software.  If not, see <https://www.gnu.org/licenses/>.
+ */
+#define UNIWILL_WMI_MGMT_GUID_BA            "ABBC0F6D-8EA1-11D1-00A0-C90629100000"
+#define UNIWILL_WMI_MGMT_GUID_BB            "ABBC0F6E-8EA1-11D1-00A0-C90629100000"
+#define UNIWILL_WMI_MGMT_GUID_BC            "ABBC0F6F-8EA1-11D1-00A0-C90629100000"
+
+#define UNIWILL_WMI_EVENT_GUID_0            "ABBC0F70-8EA1-11D1-00A0-C90629100000"
+#define UNIWILL_WMI_EVENT_GUID_1            "ABBC0F71-8EA1-11D1-00A0-C90629100000"
+#define UNIWILL_WMI_EVENT_GUID_2            "ABBC0F72-8EA1-11D1-00A0-C90629100000"
+
+#define MODULE_ALIAS_UNIWILL_WMI() \
+	MODULE_ALIAS("wmi:" UNIWILL_WMI_EVENT_GUID_2); \
+	MODULE_ALIAS("wmi:" UNIWILL_WMI_MGMT_GUID_BC);

src/uniwill_wmi.c

@@ -0,0 +1,110 @@
+/*!
+ * Copyright (c) 2021 TUXEDO Computers GmbH <tux@tuxedocomputers.com>
+ *
+ * This file is part of tuxedo-keyboard.
+ *
+ * tuxedo-keyboard is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software.  If not, see <https://www.gnu.org/licenses/>.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/acpi.h>
+#include <linux/module.h>
+#include <linux/wmi.h>
+#include <linux/version.h>
+#include "uniwill_interfaces.h"
+
+/*u32 uniwill_wmi_interface_method_call(u8 cmd, u32 arg, u32 *result_value)
+{
+	return uniwill_wmi_evaluate(cmd, arg, result_value);
+}
+
+struct uniwill_interface_t uniwill_wmi_interface = {
+	.string_id = "uniwill_wmi",
+	.method_call = uniwill_wmi_interface_method_call,
+};*/
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 3, 0)
+static int uniwill_wmi_probe(struct wmi_device *wdev)
+#else
+static int uniwill_wmi_probe(struct wmi_device *wdev, const void *dummy_context)
+#endif
+{
+	int status;
+
+	// Look for for GUIDs used on uniwill devices
+	status =
+		wmi_has_guid(UNIWILL_WMI_EVENT_GUID_0) &&
+		wmi_has_guid(UNIWILL_WMI_EVENT_GUID_1) &&
+		wmi_has_guid(UNIWILL_WMI_EVENT_GUID_2) &&
+		wmi_has_guid(UNIWILL_WMI_MGMT_GUID_BA) &&
+		wmi_has_guid(UNIWILL_WMI_MGMT_GUID_BB) &&
+		wmi_has_guid(UNIWILL_WMI_MGMT_GUID_BC);
+	
+	if (!status) {
+		pr_debug("probe: At least one Uniwill GUID missing\n");
+		return -ENODEV;
+	}
+
+	// TODO: Add interface and init
+
+	pr_info("interface initialized\n");
+
+	return 0;
+}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 13, 0)
+static int uniwill_wmi_remove(struct wmi_device *wdev)
+#else
+static void uniwill_wmi_remove(struct wmi_device *wdev)
+#endif
+{
+	pr_debug("uniwill_wmi driver remove\n");
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 13, 0)
+	return 0;
+#endif
+}
+
+static void uniwill_wmi_notify(struct wmi_device *wdev, union acpi_object *dummy)
+{
+	//u32 event_value;
+	pr_debug("uniwill_wmi notify\n");
+	/*if (!IS_ERR_OR_NULL(uniwill_wmi_interface.event_callb)) {
+		// Execute registered callback
+		// TODO
+	}*/
+}
+
+static const struct wmi_device_id uniwill_wmi_device_ids[] = {
+	// Listing one should be enough, for a driver that "takes care of all anyways"
+	// also prevents probe (and handling) per "device"
+	{ .guid_string = UNIWILL_WMI_EVENT_GUID_2 },
+	{ }
+};
+
+static struct wmi_driver uniwill_wmi_driver = {
+	.driver = { .name = "uniwill_wmi", .owner = THIS_MODULE },
+	.id_table = uniwill_wmi_device_ids,
+	.probe = uniwill_wmi_probe,
+	.remove = uniwill_wmi_remove,
+	.notify = uniwill_wmi_notify,
+};
+
+module_wmi_driver(uniwill_wmi_driver);
+
+MODULE_AUTHOR("TUXEDO Computers GmbH <tux@tuxedocomputers.com>");
+MODULE_DESCRIPTION("Driver for Uniwill WMI interface");
+MODULE_VERSION("0.0.1");
+MODULE_LICENSE("GPL");
+
+MODULE_DEVICE_TABLE(wmi, uniwill_wmi_device_ids);
+MODULE_ALIAS_UNIWILL_WMI();