| 1 | |
| 2 | |
| 3 | * ACPI Hardware Error Device (PNP0C33) Driver
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| 4 | *
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| 5 | * Copyright (C) 2010, Intel Corp.
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| 6 | * Author: Huang Ying <[email protected]>
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| 7 | *
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| 8 | * ACPI Hardware Error Device is used to report some hardware errors
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| 9 | * notified via SCI, mainly the corrected errors.
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| 10 |
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| 11 |
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| 12 | #include <linux/kernel.h>
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| 13 | #include <linux/module.h>
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| 14 | #include <linux/init.h>
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| 15 | #include <linux/acpi.h>
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| 16 | #include <linux/platform_device.h>
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| 17 | #include <acpi/hed.h>
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| 18 |
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| 19 | static const struct acpi_device_id acpi_hed_ids[] = {
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| 20 | {"PNP0C33", 0},
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| 21 | {"", 0},
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| 22 | };
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| 23 | MODULE_DEVICE_TABLE(acpi, acpi_hed_ids);
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| 24 |
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| 25 | static bool hed_present;
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| 26 |
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| 27 | static BLOCKING_NOTIFIER_HEAD(acpi_hed_notify_list);
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| 28 |
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| 29 | int register_acpi_hed_notifier(struct notifier_block *nb)
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| 30 | {
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| 31 | return blocking_notifier_chain_register(&acpi_hed_notify_list, nb);
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| 32 | }
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| 33 | EXPORT_SYMBOL_GPL(register_acpi_hed_notifier);
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| 34 |
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| 35 | void unregister_acpi_hed_notifier(struct notifier_block *nb)
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| 36 | {
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| 37 | blocking_notifier_chain_unregister(&acpi_hed_notify_list, nb);
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| 38 | }
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| 39 | EXPORT_SYMBOL_GPL(unregister_acpi_hed_notifier);
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| 40 |
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| 41 | |
| 42 | * SCI to report hardware error is forwarded to the listeners of HED,
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| 43 | * it is used by HEST Generic Hardware Error Source with notify type
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| 44 | * SCI.
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| 45 |
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| 46 | static void acpi_hed_notify(acpi_handle handle, u32 event, void *data)
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| 47 | {
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| 48 | blocking_notifier_call_chain(&acpi_hed_notify_list, 0, NULL);
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| 49 | }
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| 50 |
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| 51 | static int acpi_hed_probe(struct platform_device *pdev)
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| 52 | {
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| 53 | int err;
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| 54 |
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| 55 |
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| 56 | if (hed_present)
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| 57 | return -EINVAL;
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| 58 |
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| 59 | err = devm_acpi_install_notify_handler(&pdev->dev, ACPI_DEVICE_NOTIFY,
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| 60 | acpi_hed_notify, NULL);
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| 61 | if (err)
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| 62 | return err;
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| 63 |
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| 64 | hed_present = true;
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| 65 | return 0;
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| 66 | }
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| 67 |
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| 68 | static void acpi_hed_remove(struct platform_device *pdev)
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| 69 | {
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| 70 | hed_present = false;
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| 71 | }
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| 72 |
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| 73 | static struct platform_driver acpi_hed_driver = {
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| 74 | .probe = acpi_hed_probe,
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| 75 | .remove = acpi_hed_remove,
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| 76 | .driver = {
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| 77 | .name = "acpi-hardware-error-device",
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| 78 | .acpi_match_table = acpi_hed_ids,
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| 79 | },
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| 80 | };
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| 81 |
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| 82 | static int __init acpi_hed_driver_init(void)
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| 83 | {
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| 84 | return platform_driver_register(&acpi_hed_driver);
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| 85 | }
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| 86 | subsys_initcall(acpi_hed_driver_init);
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| 87 |
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| 88 | MODULE_AUTHOR("Huang Ying");
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| 89 | MODULE_DESCRIPTION("ACPI Hardware Error Device Driver");
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| 90 | MODULE_LICENSE("GPL");
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