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drivers/acpi/event.c
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// SPDX-License-Identifier: GPL-2.0 |
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/* * event.c - exporting ACPI events via procfs * * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> * */ #include <linux/spinlock.h> |
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#include <linux/export.h> |
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#include <linux/proc_fs.h> #include <linux/init.h> #include <linux/poll.h> |
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#include <linux/gfp.h> |
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#include <linux/acpi.h> |
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#include <net/netlink.h> #include <net/genetlink.h> |
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#include "internal.h" |
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/* ACPI notifier chain */ |
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static BLOCKING_NOTIFIER_HEAD(acpi_chain_head); |
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int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data) { struct acpi_bus_event event; strcpy(event.device_class, dev->pnp.device_class); strcpy(event.bus_id, dev->pnp.bus_id); event.type = type; event.data = data; return (blocking_notifier_call_chain(&acpi_chain_head, 0, (void *)&event) |
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== NOTIFY_BAD) ? -EINVAL : 0; |
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} EXPORT_SYMBOL(acpi_notifier_call_chain); int register_acpi_notifier(struct notifier_block *nb) { return blocking_notifier_chain_register(&acpi_chain_head, nb); } EXPORT_SYMBOL(register_acpi_notifier); int unregister_acpi_notifier(struct notifier_block *nb) { return blocking_notifier_chain_unregister(&acpi_chain_head, nb); } EXPORT_SYMBOL(unregister_acpi_notifier); |
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#ifdef CONFIG_NET |
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static unsigned int acpi_event_seqnum; |
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struct acpi_genl_event { acpi_device_class device_class; char bus_id[15]; u32 type; u32 data; }; /* attributes of acpi_genl_family */ enum { ACPI_GENL_ATTR_UNSPEC, ACPI_GENL_ATTR_EVENT, /* ACPI event info needed by user space */ __ACPI_GENL_ATTR_MAX, }; #define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1) /* commands supported by the acpi_genl_family */ enum { ACPI_GENL_CMD_UNSPEC, ACPI_GENL_CMD_EVENT, /* kernel->user notifications for ACPI events */ __ACPI_GENL_CMD_MAX, }; #define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1) |
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#define ACPI_GENL_FAMILY_NAME "acpi_event" #define ACPI_GENL_VERSION 0x01 #define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group" |
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static const struct genl_multicast_group acpi_event_mcgrps[] = { { .name = ACPI_GENL_MCAST_GROUP_NAME, }, }; |
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static struct genl_family acpi_event_genl_family __ro_after_init = { |
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.module = THIS_MODULE, |
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.name = ACPI_GENL_FAMILY_NAME, |
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.version = ACPI_GENL_VERSION, .maxattr = ACPI_GENL_ATTR_MAX, |
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.mcgrps = acpi_event_mcgrps, .n_mcgrps = ARRAY_SIZE(acpi_event_mcgrps), |
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}; |
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int acpi_bus_generate_netlink_event(const char *device_class, const char *bus_id, |
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u8 type, int data) { struct sk_buff *skb; struct nlattr *attr; struct acpi_genl_event *event; void *msg_header; int size; |
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/* allocate memory */ size = nla_total_size(sizeof(struct acpi_genl_event)) + nla_total_size(0); skb = genlmsg_new(size, GFP_ATOMIC); if (!skb) return -ENOMEM; /* add the genetlink message header */ msg_header = genlmsg_put(skb, 0, acpi_event_seqnum++, &acpi_event_genl_family, 0, ACPI_GENL_CMD_EVENT); if (!msg_header) { nlmsg_free(skb); return -ENOMEM; } /* fill the data */ attr = nla_reserve(skb, ACPI_GENL_ATTR_EVENT, sizeof(struct acpi_genl_event)); if (!attr) { nlmsg_free(skb); return -EINVAL; } event = nla_data(attr); |
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memset(event, 0, sizeof(struct acpi_genl_event)); |
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strscpy(event->device_class, device_class, sizeof(event->device_class)); strscpy(event->bus_id, bus_id, sizeof(event->bus_id)); |
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event->type = type; event->data = data; /* send multicast genetlink message */ |
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genlmsg_end(skb, msg_header); |
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genlmsg_multicast(&acpi_event_genl_family, skb, 0, 0, GFP_ATOMIC); |
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return 0; } |
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EXPORT_SYMBOL(acpi_bus_generate_netlink_event); |
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static int __init acpi_event_genetlink_init(void) |
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{ |
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return genl_register_family(&acpi_event_genl_family); |
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} #else |
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int acpi_bus_generate_netlink_event(const char *device_class, const char *bus_id, u8 type, int data) |
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{ return 0; } |
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EXPORT_SYMBOL(acpi_bus_generate_netlink_event); |
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static int acpi_event_genetlink_init(void) { return -ENODEV; } #endif |
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static int __init acpi_event_init(void) { |
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int error = 0; |
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if (acpi_disabled) |
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return 0; |
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/* create genetlink for acpi event */ error = acpi_event_genetlink_init(); if (error) printk(KERN_WARNING PREFIX "Failed to create genetlink family for ACPI event "); |
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return 0; |
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} |
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fs_initcall(acpi_event_init); |