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-rw-r--r--drivers/acpi/hed.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/drivers/acpi/hed.c b/drivers/acpi/hed.c
new file mode 100644
index 000000000..cf148287e
--- /dev/null
+++ b/drivers/acpi/hed.c
@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ACPI Hardware Error Device (PNP0C33) Driver
+ *
+ * Copyright (C) 2010, Intel Corp.
+ * Author: Huang Ying <ying.huang@intel.com>
+ *
+ * ACPI Hardware Error Device is used to report some hardware errors
+ * notified via SCI, mainly the corrected errors.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/acpi.h>
+#include <acpi/hed.h>
+
+static const struct acpi_device_id acpi_hed_ids[] = {
+ {"PNP0C33", 0},
+ {"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, acpi_hed_ids);
+
+static acpi_handle hed_handle;
+
+static BLOCKING_NOTIFIER_HEAD(acpi_hed_notify_list);
+
+int register_acpi_hed_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&acpi_hed_notify_list, nb);
+}
+EXPORT_SYMBOL_GPL(register_acpi_hed_notifier);
+
+void unregister_acpi_hed_notifier(struct notifier_block *nb)
+{
+ blocking_notifier_chain_unregister(&acpi_hed_notify_list, nb);
+}
+EXPORT_SYMBOL_GPL(unregister_acpi_hed_notifier);
+
+/*
+ * SCI to report hardware error is forwarded to the listeners of HED,
+ * it is used by HEST Generic Hardware Error Source with notify type
+ * SCI.
+ */
+static void acpi_hed_notify(struct acpi_device *device, u32 event)
+{
+ blocking_notifier_call_chain(&acpi_hed_notify_list, 0, NULL);
+}
+
+static int acpi_hed_add(struct acpi_device *device)
+{
+ /* Only one hardware error device */
+ if (hed_handle)
+ return -EINVAL;
+ hed_handle = device->handle;
+ return 0;
+}
+
+static int acpi_hed_remove(struct acpi_device *device)
+{
+ hed_handle = NULL;
+ return 0;
+}
+
+static struct acpi_driver acpi_hed_driver = {
+ .name = "hardware_error_device",
+ .class = "hardware_error",
+ .ids = acpi_hed_ids,
+ .ops = {
+ .add = acpi_hed_add,
+ .remove = acpi_hed_remove,
+ .notify = acpi_hed_notify,
+ },
+};
+module_acpi_driver(acpi_hed_driver);
+
+ACPI_MODULE_NAME("hed");
+MODULE_AUTHOR("Huang Ying");
+MODULE_DESCRIPTION("ACPI Hardware Error Device Driver");
+MODULE_LICENSE("GPL");