1802d0beec
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 655 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070034.575739538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
118 lines
2.6 KiB
C
118 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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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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#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_DEVICE_TABLE(wmi, wmi_bmof_id_table);
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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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