From fe41e0d039db9482d884bf9074e552f1c2eaf155 Mon Sep 17 00:00:00 2001
From: Christoffer Sandberg <cs@tuxedo.de>
Date: Mon, 16 Nov 2020 16:27:34 +0100
Subject: [PATCH] Add basic driver structure for "new" clevo interface

---
 Makefile         |  2 +-
 dkms.conf        |  4 +++
 src/clevo_acpi.c | 81 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 86 insertions(+), 1 deletion(-)
 create mode 100644 src/clevo_acpi.c

diff --git a/Makefile b/Makefile
index a91b6bf..b8d0363 100644
--- a/Makefile
+++ b/Makefile
@@ -16,7 +16,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this software.  If not, see <https://www.gnu.org/licenses/>.
 #
-obj-m := ./src/tuxedo_keyboard.o
+obj-m := ./src/tuxedo_keyboard.o ./src/clevo_acpi.o
 
 PWD := $(shell pwd)
 KDIR := /lib/modules/$(shell uname -r)/build
diff --git a/dkms.conf b/dkms.conf
index cf3202e..6406f03 100644
--- a/dkms.conf
+++ b/dkms.conf
@@ -5,6 +5,10 @@ DEST_MODULE_LOCATION[0]="/kernel/lib/"
 BUILT_MODULE_NAME[0]="tuxedo_keyboard"
 BUILT_MODULE_LOCATION[0]="src/"
 
+DEST_MODULE_LOCATION[0]="/kernel/lib/"
+BUILT_MODULE_NAME[0]="clevo_acpi"
+BUILT_MODULE_LOCATION[0]="src/"
+
 MAKE[0]="make KDIR=/lib/modules/${kernelver}/build"
 CLEAN="make clean"
 AUTOINSTALL="yes"
diff --git a/src/clevo_acpi.c b/src/clevo_acpi.c
new file mode 100644
index 0000000..b2cc448
--- /dev/null
+++ b/src/clevo_acpi.c
@@ -0,0 +1,81 @@
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/acpi.h>
+
+#define DRIVER_NAME			"clevo_acpi"
+#define CLEVO_ACPI_RESOURCE_HID		"CLV0001"
+
+struct clevo_acpi_driver_data_t {
+	struct acpi_device *device;
+};
+
+static int clevo_acpi_add(struct acpi_device *device)
+{
+	struct clevo_acpi_driver_data_t *driver_data;
+
+	driver_data = devm_kzalloc(&device->dev, sizeof(*driver_data), GFP_KERNEL);
+	if (!driver_data)
+		return -ENOMEM;
+
+	driver_data->device = device;
+
+	pr_debug("acpi add");
+
+	return 0;
+}
+
+static int clevo_acpi_remove(struct acpi_device *device)
+{
+	pr_debug("acpi remove");
+	return 0;
+}
+
+static void clevo_acpi_notify(struct acpi_device *device, u32 event)
+{
+	pr_debug("event: %0#10x", event);
+}
+
+#ifdef CONFIG_PM
+static int driver_suspend_callb(struct device *dev)
+{
+	pr_debug("driver suspend\n");
+	return 0;
+}
+
+static int driver_resume_callb(struct device *dev)
+{
+	pr_debug("driver resume\n");
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(clevo_driver_pm_ops, driver_suspend_callb, driver_resume_callb);
+#endif
+
+static const struct acpi_device_id clevo_acpi_device_ids[] = {
+	{CLEVO_ACPI_RESOURCE_HID, 0},
+	{"", 0}
+};
+
+static struct acpi_driver clevo_acpi_driver = {
+	.name = DRIVER_NAME,
+	.class = DRIVER_NAME,
+	.owner = THIS_MODULE,
+	.ids = clevo_acpi_device_ids,
+	.flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
+	.ops = {
+		.add = clevo_acpi_add,
+		.remove = clevo_acpi_remove,
+		.notify = clevo_acpi_notify,
+	},
+#ifdef CONFIG_PM
+	.drv.pm = &clevo_driver_pm_ops
+#endif
+};
+
+module_acpi_driver(clevo_acpi_driver);
+
+MODULE_AUTHOR("TUXEDO Computers GmbH <tux@tuxedocomputers.com>");
+MODULE_DESCRIPTION("Driver for Clevo ACPI interface");
+MODULE_VERSION("0.0.1");
+MODULE_LICENSE("GPL");