v4.19.13 snapshot.
diff --git a/drivers/platform/x86/wmi-bmof.c b/drivers/platform/x86/wmi-bmof.c
new file mode 100644
index 0000000..c4530ba
--- /dev/null
+++ b/drivers/platform/x86/wmi-bmof.c
@@ -0,0 +1,125 @@
+/*
+ * WMI embedded Binary MOF driver
+ *
+ * Copyright (c) 2015 Andrew Lutomirski
+ * Copyright (C) 2017 VMware, Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program 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.
+ */
+
+#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"
+
+struct bmof_priv {
+ union acpi_object *bmofdata;
+ struct bin_attribute bmof_bin_attr;
+};
+
+static ssize_t
+read_bmof(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off, size_t count)
+{
+ struct bmof_priv *priv =
+ container_of(attr, struct bmof_priv, bmof_bin_attr);
+
+ if (off < 0)
+ return -EINVAL;
+
+ if (off >= priv->bmofdata->buffer.length)
+ return 0;
+
+ if (count > priv->bmofdata->buffer.length - off)
+ count = priv->bmofdata->buffer.length - off;
+
+ memcpy(buf, priv->bmofdata->buffer.pointer + off, count);
+ return count;
+}
+
+static int wmi_bmof_probe(struct wmi_device *wdev)
+{
+ struct bmof_priv *priv;
+ int ret;
+
+ priv = devm_kzalloc(&wdev->dev, sizeof(struct bmof_priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ dev_set_drvdata(&wdev->dev, priv);
+
+ priv->bmofdata = wmidev_block_query(wdev, 0);
+ if (!priv->bmofdata) {
+ dev_err(&wdev->dev, "failed to read Binary MOF\n");
+ return -EIO;
+ }
+
+ if (priv->bmofdata->type != ACPI_TYPE_BUFFER) {
+ dev_err(&wdev->dev, "Binary MOF is not a buffer\n");
+ ret = -EIO;
+ goto err_free;
+ }
+
+ sysfs_bin_attr_init(&priv->bmof_bin_attr);
+ priv->bmof_bin_attr.attr.name = "bmof";
+ priv->bmof_bin_attr.attr.mode = 0400;
+ priv->bmof_bin_attr.read = read_bmof;
+ priv->bmof_bin_attr.size = priv->bmofdata->buffer.length;
+
+ ret = sysfs_create_bin_file(&wdev->dev.kobj, &priv->bmof_bin_attr);
+ if (ret)
+ goto err_free;
+
+ return 0;
+
+ err_free:
+ kfree(priv->bmofdata);
+ return ret;
+}
+
+static int wmi_bmof_remove(struct wmi_device *wdev)
+{
+ struct bmof_priv *priv = dev_get_drvdata(&wdev->dev);
+
+ sysfs_remove_bin_file(&wdev->dev.kobj, &priv->bmof_bin_attr);
+ kfree(priv->bmofdata);
+ return 0;
+}
+
+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",
+ },
+ .probe = wmi_bmof_probe,
+ .remove = wmi_bmof_remove,
+ .id_table = wmi_bmof_id_table,
+};
+
+module_wmi_driver(wmi_bmof_driver);
+
+MODULE_ALIAS("wmi:" WMI_BMOF_GUID);
+MODULE_AUTHOR("Andrew Lutomirski <luto@kernel.org>");
+MODULE_DESCRIPTION("WMI embedded Binary MOF driver");
+MODULE_LICENSE("GPL");