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116 lines
2.6 KiB
116 lines
2.6 KiB
// 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, const void *context) |
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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 void 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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} |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("WMI embedded Binary MOF driver"); |
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MODULE_LICENSE("GPL");
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