// 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"
|
|
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, const void *context)
|
{
|
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_DEVICE_TABLE(wmi, wmi_bmof_id_table);
|
MODULE_AUTHOR("Andrew Lutomirski <luto@kernel.org>");
|
MODULE_DESCRIPTION("WMI embedded Binary MOF driver");
|
MODULE_LICENSE("GPL");
|
