126 lines
3 KiB
C
126 lines
3 KiB
C
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/*
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* WMI embedded Binary MOF driver
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*
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* Copyright (c) 2015 Andrew Lutomirski
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* Copyright (C) 2017 VMware, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/acpi.h>
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#include <linux/device.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/sysfs.h>
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#include <linux/types.h>
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#include <linux/wmi.h>
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#define WMI_BMOF_GUID "05901221-D566-11D1-B2F0-00A0C9062910"
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struct bmof_priv {
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union acpi_object *bmofdata;
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struct bin_attribute bmof_bin_attr;
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};
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static ssize_t
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read_bmof(struct file *filp, struct kobject *kobj,
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struct bin_attribute *attr,
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char *buf, loff_t off, size_t count)
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{
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struct bmof_priv *priv =
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container_of(attr, struct bmof_priv, bmof_bin_attr);
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if (off < 0)
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return -EINVAL;
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if (off >= priv->bmofdata->buffer.length)
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return 0;
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if (count > priv->bmofdata->buffer.length - off)
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count = priv->bmofdata->buffer.length - off;
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memcpy(buf, priv->bmofdata->buffer.pointer + off, count);
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return count;
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}
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static int wmi_bmof_probe(struct wmi_device *wdev)
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{
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struct bmof_priv *priv;
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int ret;
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priv = devm_kzalloc(&wdev->dev, sizeof(struct bmof_priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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dev_set_drvdata(&wdev->dev, priv);
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priv->bmofdata = wmidev_block_query(wdev, 0);
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if (!priv->bmofdata) {
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dev_err(&wdev->dev, "failed to read Binary MOF\n");
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return -EIO;
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}
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if (priv->bmofdata->type != ACPI_TYPE_BUFFER) {
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dev_err(&wdev->dev, "Binary MOF is not a buffer\n");
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ret = -EIO;
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goto err_free;
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}
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sysfs_bin_attr_init(&priv->bmof_bin_attr);
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priv->bmof_bin_attr.attr.name = "bmof";
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priv->bmof_bin_attr.attr.mode = 0400;
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priv->bmof_bin_attr.read = read_bmof;
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priv->bmof_bin_attr.size = priv->bmofdata->buffer.length;
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ret = sysfs_create_bin_file(&wdev->dev.kobj, &priv->bmof_bin_attr);
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if (ret)
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goto err_free;
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return 0;
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err_free:
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kfree(priv->bmofdata);
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return ret;
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}
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static int wmi_bmof_remove(struct wmi_device *wdev)
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{
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struct bmof_priv *priv = dev_get_drvdata(&wdev->dev);
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sysfs_remove_bin_file(&wdev->dev.kobj, &priv->bmof_bin_attr);
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kfree(priv->bmofdata);
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return 0;
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}
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static const struct wmi_device_id wmi_bmof_id_table[] = {
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{ .guid_string = WMI_BMOF_GUID },
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{ },
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};
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static struct wmi_driver wmi_bmof_driver = {
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.driver = {
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.name = "wmi-bmof",
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},
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.probe = wmi_bmof_probe,
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.remove = wmi_bmof_remove,
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.id_table = wmi_bmof_id_table,
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};
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module_wmi_driver(wmi_bmof_driver);
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MODULE_ALIAS("wmi:" WMI_BMOF_GUID);
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MODULE_AUTHOR("Andrew Lutomirski <luto@kernel.org>");
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MODULE_DESCRIPTION("WMI embedded Binary MOF driver");
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MODULE_LICENSE("GPL");
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