1 files changed, 106 insertions, 0 deletions
diff --git a/drivers/platform/x86/wmi-bmof.c b/drivers/platform/x86/wmi-bmof.c
new file mode 100644
index 000000000000..5b00370a9a22
--- /dev/null
+++ b/drivers/platform/x86/wmi-bmof.c
@@ -0,0 +1,106 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * WMI embedded Binary MOF driver
+ *
+ * Copyright (c) 2015 Andrew Lutomirski
+ * Copyright (C) 2017 VMware, Inc. All Rights Reserved.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/acpi.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/sysfs.h>
+#include <linux/types.h>
+#include <linux/wmi.h>
+
+#define WMI_BMOF_GUID "05901221-D566-11D1-B2F0-00A0C9062910"
+
+static ssize_t bmof_read(struct file *filp, struct kobject *kobj, const struct bin_attribute *attr,
+			 char *buf, loff_t off, size_t count)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	union acpi_object *obj = dev_get_drvdata(dev);
+
+	return memory_read_from_buffer(buf, count, &off, obj->buffer.pointer, obj->buffer.length);
+}
+
+static const BIN_ATTR_ADMIN_RO(bmof, 0);
+
+static const struct bin_attribute * const bmof_attrs[] = {
+	&bin_attr_bmof,
+	NULL
+};
+
+static size_t bmof_bin_size(struct kobject *kobj, const struct bin_attribute *attr, int n)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	union acpi_object *obj = dev_get_drvdata(dev);
+
+	return obj->buffer.length;
+}
+
+static const struct attribute_group bmof_group = {
+	.bin_size = bmof_bin_size,
+	.bin_attrs = bmof_attrs,
+};
+
+static const struct attribute_group *bmof_groups[] = {
+	&bmof_group,
+	NULL
+};
+
+static int wmi_bmof_probe(struct wmi_device *wdev, const void *context)
+{
+	union acpi_object *obj;
+
+	obj = wmidev_block_query(wdev, 0);
+	if (!obj) {
+		dev_err(&wdev->dev, "failed to read Binary MOF\n");
+		return -EIO;
+	}
+
+	if (obj->type != ACPI_TYPE_BUFFER) {
+		dev_err(&wdev->dev, "Binary MOF is not a buffer\n");
+		kfree(obj);
+		return -EIO;
+	}
+
+	dev_set_drvdata(&wdev->dev, obj);
+
+	return 0;
+}
+
+static void wmi_bmof_remove(struct wmi_device *wdev)
+{
+	union acpi_object *obj = dev_get_drvdata(&wdev->dev);
+
+	kfree(obj);
+}
+
+static const struct wmi_device_id wmi_bmof_id_table[] = {
+	{ .guid_string = WMI_BMOF_GUID },
+	{ },
+};
+
+static struct wmi_driver wmi_bmof_driver = {
+	.driver = {
+		.name = "wmi-bmof",
+		.dev_groups = bmof_groups,
+	},
+	.probe = wmi_bmof_probe,
+	.remove = wmi_bmof_remove,
+	.id_table = wmi_bmof_id_table,
+	.no_singleton = true,
+};
+
+module_wmi_driver(wmi_bmof_driver);
+
+MODULE_DEVICE_TABLE(wmi, wmi_bmof_id_table);
+MODULE_AUTHOR("Andrew Lutomirski <luto@kernel.org>");
+MODULE_DESCRIPTION("WMI embedded Binary MOF driver");
+MODULE_LICENSE("GPL");