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// 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_new = 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");
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