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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * WMI embedded Binary MOF driver
4 *
5 * Copyright (c) 2015 Andrew Lutomirski
6 * Copyright (C) 2017 VMware, Inc. All Rights Reserved.
7 */
8
9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11#include <linux/acpi.h>
12#include <linux/device.h>
13#include <linux/fs.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/string.h>
17#include <linux/sysfs.h>
18#include <linux/types.h>
19#include <linux/wmi.h>
20
21#define WMI_BMOF_GUID "05901221-D566-11D1-B2F0-00A0C9062910"
22
23struct bmof_priv {
24 union acpi_object *bmofdata;
25 struct bin_attribute bmof_bin_attr;
26};
27
28static ssize_t
29read_bmof(struct file *filp, struct kobject *kobj,
30 struct bin_attribute *attr,
31 char *buf, loff_t off, size_t count)
32{
33 struct bmof_priv *priv =
34 container_of(attr, struct bmof_priv, bmof_bin_attr);
35
36 if (off < 0)
37 return -EINVAL;
38
39 if (off >= priv->bmofdata->buffer.length)
40 return 0;
41
42 if (count > priv->bmofdata->buffer.length - off)
43 count = priv->bmofdata->buffer.length - off;
44
45 memcpy(buf, priv->bmofdata->buffer.pointer + off, count);
46 return count;
47}
48
49static int wmi_bmof_probe(struct wmi_device *wdev, const void *context)
50{
51 struct bmof_priv *priv;
52 int ret;
53
54 priv = devm_kzalloc(&wdev->dev, sizeof(struct bmof_priv), GFP_KERNEL);
55 if (!priv)
56 return -ENOMEM;
57
58 dev_set_drvdata(&wdev->dev, priv);
59
60 priv->bmofdata = wmidev_block_query(wdev, 0);
61 if (!priv->bmofdata) {
62 dev_err(&wdev->dev, "failed to read Binary MOF\n");
63 return -EIO;
64 }
65
66 if (priv->bmofdata->type != ACPI_TYPE_BUFFER) {
67 dev_err(&wdev->dev, "Binary MOF is not a buffer\n");
68 ret = -EIO;
69 goto err_free;
70 }
71
72 sysfs_bin_attr_init(&priv->bmof_bin_attr);
73 priv->bmof_bin_attr.attr.name = "bmof";
74 priv->bmof_bin_attr.attr.mode = 0400;
75 priv->bmof_bin_attr.read = read_bmof;
76 priv->bmof_bin_attr.size = priv->bmofdata->buffer.length;
77
78 ret = sysfs_create_bin_file(&wdev->dev.kobj, &priv->bmof_bin_attr);
79 if (ret)
80 goto err_free;
81
82 return 0;
83
84 err_free:
85 kfree(priv->bmofdata);
86 return ret;
87}
88
89static void wmi_bmof_remove(struct wmi_device *wdev)
90{
91 struct bmof_priv *priv = dev_get_drvdata(&wdev->dev);
92
93 sysfs_remove_bin_file(&wdev->dev.kobj, &priv->bmof_bin_attr);
94 kfree(priv->bmofdata);
95}
96
97static const struct wmi_device_id wmi_bmof_id_table[] = {
98 { .guid_string = WMI_BMOF_GUID },
99 { },
100};
101
102static struct wmi_driver wmi_bmof_driver = {
103 .driver = {
104 .name = "wmi-bmof",
105 },
106 .probe = wmi_bmof_probe,
107 .remove = wmi_bmof_remove,
108 .id_table = wmi_bmof_id_table,
109};
110
111module_wmi_driver(wmi_bmof_driver);
112
113MODULE_DEVICE_TABLE(wmi, wmi_bmof_id_table);
114MODULE_AUTHOR("Andrew Lutomirski <luto@kernel.org>");
115MODULE_DESCRIPTION("WMI embedded Binary MOF driver");
116MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * WMI embedded Binary MOF driver
4 *
5 * Copyright (c) 2015 Andrew Lutomirski
6 * Copyright (C) 2017 VMware, Inc. All Rights Reserved.
7 */
8
9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11#include <linux/acpi.h>
12#include <linux/device.h>
13#include <linux/fs.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/string.h>
17#include <linux/sysfs.h>
18#include <linux/types.h>
19#include <linux/wmi.h>
20
21#define WMI_BMOF_GUID "05901221-D566-11D1-B2F0-00A0C9062910"
22
23struct bmof_priv {
24 union acpi_object *bmofdata;
25 struct bin_attribute bmof_bin_attr;
26};
27
28static ssize_t read_bmof(struct file *filp, struct kobject *kobj, struct bin_attribute *attr,
29 char *buf, loff_t off, size_t count)
30{
31 struct bmof_priv *priv = container_of(attr, struct bmof_priv, bmof_bin_attr);
32
33 return memory_read_from_buffer(buf, count, &off, priv->bmofdata->buffer.pointer,
34 priv->bmofdata->buffer.length);
35}
36
37static int wmi_bmof_probe(struct wmi_device *wdev, const void *context)
38{
39 struct bmof_priv *priv;
40 int ret;
41
42 priv = devm_kzalloc(&wdev->dev, sizeof(struct bmof_priv), GFP_KERNEL);
43 if (!priv)
44 return -ENOMEM;
45
46 dev_set_drvdata(&wdev->dev, priv);
47
48 priv->bmofdata = wmidev_block_query(wdev, 0);
49 if (!priv->bmofdata) {
50 dev_err(&wdev->dev, "failed to read Binary MOF\n");
51 return -EIO;
52 }
53
54 if (priv->bmofdata->type != ACPI_TYPE_BUFFER) {
55 dev_err(&wdev->dev, "Binary MOF is not a buffer\n");
56 ret = -EIO;
57 goto err_free;
58 }
59
60 sysfs_bin_attr_init(&priv->bmof_bin_attr);
61 priv->bmof_bin_attr.attr.name = "bmof";
62 priv->bmof_bin_attr.attr.mode = 0400;
63 priv->bmof_bin_attr.read = read_bmof;
64 priv->bmof_bin_attr.size = priv->bmofdata->buffer.length;
65
66 ret = device_create_bin_file(&wdev->dev, &priv->bmof_bin_attr);
67 if (ret)
68 goto err_free;
69
70 return 0;
71
72 err_free:
73 kfree(priv->bmofdata);
74 return ret;
75}
76
77static void wmi_bmof_remove(struct wmi_device *wdev)
78{
79 struct bmof_priv *priv = dev_get_drvdata(&wdev->dev);
80
81 device_remove_bin_file(&wdev->dev, &priv->bmof_bin_attr);
82 kfree(priv->bmofdata);
83}
84
85static const struct wmi_device_id wmi_bmof_id_table[] = {
86 { .guid_string = WMI_BMOF_GUID },
87 { },
88};
89
90static struct wmi_driver wmi_bmof_driver = {
91 .driver = {
92 .name = "wmi-bmof",
93 },
94 .probe = wmi_bmof_probe,
95 .remove = wmi_bmof_remove,
96 .id_table = wmi_bmof_id_table,
97 .no_singleton = true,
98};
99
100module_wmi_driver(wmi_bmof_driver);
101
102MODULE_DEVICE_TABLE(wmi, wmi_bmof_id_table);
103MODULE_AUTHOR("Andrew Lutomirski <luto@kernel.org>");
104MODULE_DESCRIPTION("WMI embedded Binary MOF driver");
105MODULE_LICENSE("GPL");