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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 | // SPDX-License-Identifier: GPL-2.0 /* * 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> #include <linux/export.h> #include <linux/proc_fs.h> #include <linux/init.h> #include <linux/poll.h> #include <linux/gfp.h> #include <linux/acpi.h> #include <net/netlink.h> #include <net/genetlink.h> #include "internal.h" #define _COMPONENT ACPI_SYSTEM_COMPONENT ACPI_MODULE_NAME("event"); /* ACPI notifier chain */ static BLOCKING_NOTIFIER_HEAD(acpi_chain_head); 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) == NOTIFY_BAD) ? -EINVAL : 0; } 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); #ifdef CONFIG_NET static unsigned int acpi_event_seqnum; 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) #define ACPI_GENL_FAMILY_NAME "acpi_event" #define ACPI_GENL_VERSION 0x01 #define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group" static const struct genl_multicast_group acpi_event_mcgrps[] = { { .name = ACPI_GENL_MCAST_GROUP_NAME, }, }; static struct genl_family acpi_event_genl_family __ro_after_init = { .module = THIS_MODULE, .name = ACPI_GENL_FAMILY_NAME, .version = ACPI_GENL_VERSION, .maxattr = ACPI_GENL_ATTR_MAX, .mcgrps = acpi_event_mcgrps, .n_mcgrps = ARRAY_SIZE(acpi_event_mcgrps), }; int acpi_bus_generate_netlink_event(const char *device_class, const char *bus_id, u8 type, int data) { struct sk_buff *skb; struct nlattr *attr; struct acpi_genl_event *event; void *msg_header; int size; /* 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); memset(event, 0, sizeof(struct acpi_genl_event)); strcpy(event->device_class, device_class); strcpy(event->bus_id, bus_id); event->type = type; event->data = data; /* send multicast genetlink message */ genlmsg_end(skb, msg_header); genlmsg_multicast(&acpi_event_genl_family, skb, 0, 0, GFP_ATOMIC); return 0; } EXPORT_SYMBOL(acpi_bus_generate_netlink_event); static int __init acpi_event_genetlink_init(void) { return genl_register_family(&acpi_event_genl_family); } #else int acpi_bus_generate_netlink_event(const char *device_class, const char *bus_id, u8 type, int data) { return 0; } EXPORT_SYMBOL(acpi_bus_generate_netlink_event); static int acpi_event_genetlink_init(void) { return -ENODEV; } #endif static int __init acpi_event_init(void) { int error = 0; if (acpi_disabled) return 0; /* create genetlink for acpi event */ error = acpi_event_genetlink_init(); if (error) printk(KERN_WARNING PREFIX "Failed to create genetlink family for ACPI event\n"); return 0; } fs_initcall(acpi_event_init); |