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While binding drivers directly to struct acpi_device objects allows basic functionality to be provided, at least in the majority of cases, there are some problems with it, related to general consistency, sysfs layout, power management operation ordering, and code cleanliness. Overall, it is better to bind drivers to platform devices than to their ACPI companions, so convert the ACPI hardware error device (HED) driver to a platform one. While this is not expected to alter functionality, it changes sysfs layout and so it will be visible to user space. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Link: https://patch.msgid.link/8620378.T7Z3S40VBb@rafael.j.wysocki
95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ACPI Hardware Error Device (PNP0C33) Driver
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*
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* Copyright (C) 2010, Intel Corp.
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* Author: Huang Ying <ying.huang@intel.com>
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*
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* ACPI Hardware Error Device is used to report some hardware errors
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* notified via SCI, mainly the corrected errors.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/acpi.h>
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#include <linux/platform_device.h>
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#include <acpi/hed.h>
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static const struct acpi_device_id acpi_hed_ids[] = {
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{"PNP0C33", 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, acpi_hed_ids);
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static acpi_handle hed_handle;
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static BLOCKING_NOTIFIER_HEAD(acpi_hed_notify_list);
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int register_acpi_hed_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&acpi_hed_notify_list, nb);
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}
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EXPORT_SYMBOL_GPL(register_acpi_hed_notifier);
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void unregister_acpi_hed_notifier(struct notifier_block *nb)
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{
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blocking_notifier_chain_unregister(&acpi_hed_notify_list, nb);
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}
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EXPORT_SYMBOL_GPL(unregister_acpi_hed_notifier);
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/*
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* SCI to report hardware error is forwarded to the listeners of HED,
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* it is used by HEST Generic Hardware Error Source with notify type
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* SCI.
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*/
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static void acpi_hed_notify(acpi_handle handle, u32 event, void *data)
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{
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blocking_notifier_call_chain(&acpi_hed_notify_list, 0, NULL);
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}
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static int acpi_hed_probe(struct platform_device *pdev)
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{
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struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
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int err;
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/* Only one hardware error device */
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if (hed_handle)
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return -EINVAL;
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hed_handle = device->handle;
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err = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY,
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acpi_hed_notify, device);
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if (err)
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hed_handle = NULL;
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return err;
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}
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static void acpi_hed_remove(struct platform_device *pdev)
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{
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struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
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acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY,
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acpi_hed_notify);
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hed_handle = NULL;
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}
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static struct platform_driver acpi_hed_driver = {
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.probe = acpi_hed_probe,
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.remove = acpi_hed_remove,
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.driver = {
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.name = "acpi-hardware-error-device",
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.acpi_match_table = acpi_hed_ids,
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},
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};
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static int __init acpi_hed_driver_init(void)
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{
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return platform_driver_register(&acpi_hed_driver);
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}
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subsys_initcall(acpi_hed_driver_init);
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MODULE_AUTHOR("Huang Ying");
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MODULE_DESCRIPTION("ACPI Hardware Error Device Driver");
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MODULE_LICENSE("GPL");
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