| 1 | /* |
| 2 | * event.c - exporting ACPI events via procfs |
| 3 | * |
| 4 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> |
| 5 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> |
| 6 | * |
| 7 | */ |
| 8 | |
| 9 | #include <linux/spinlock.h> |
| 10 | #include <linux/export.h> |
| 11 | #include <linux/proc_fs.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/poll.h> |
| 14 | #include <linux/gfp.h> |
| 15 | #include <linux/acpi.h> |
| 16 | #include <net/netlink.h> |
| 17 | #include <net/genetlink.h> |
| 18 | |
| 19 | #include "internal.h" |
| 20 | |
| 21 | #define _COMPONENT ACPI_SYSTEM_COMPONENT |
| 22 | ACPI_MODULE_NAME("event"); |
| 23 | |
| 24 | /* ACPI notifier chain */ |
| 25 | static BLOCKING_NOTIFIER_HEAD(acpi_chain_head); |
| 26 | |
| 27 | int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data) |
| 28 | { |
| 29 | struct acpi_bus_event event; |
| 30 | |
| 31 | strcpy(event.device_class, dev->pnp.device_class); |
| 32 | strcpy(event.bus_id, dev->pnp.bus_id); |
| 33 | event.type = type; |
| 34 | event.data = data; |
| 35 | return (blocking_notifier_call_chain(&acpi_chain_head, 0, (void *)&event) |
| 36 | == NOTIFY_BAD) ? -EINVAL : 0; |
| 37 | } |
| 38 | EXPORT_SYMBOL(acpi_notifier_call_chain); |
| 39 | |
| 40 | int register_acpi_notifier(struct notifier_block *nb) |
| 41 | { |
| 42 | return blocking_notifier_chain_register(&acpi_chain_head, nb); |
| 43 | } |
| 44 | EXPORT_SYMBOL(register_acpi_notifier); |
| 45 | |
| 46 | int unregister_acpi_notifier(struct notifier_block *nb) |
| 47 | { |
| 48 | return blocking_notifier_chain_unregister(&acpi_chain_head, nb); |
| 49 | } |
| 50 | EXPORT_SYMBOL(unregister_acpi_notifier); |
| 51 | |
| 52 | #ifdef CONFIG_NET |
| 53 | static unsigned int acpi_event_seqnum; |
| 54 | struct acpi_genl_event { |
| 55 | acpi_device_class device_class; |
| 56 | char bus_id[15]; |
| 57 | u32 type; |
| 58 | u32 data; |
| 59 | }; |
| 60 | |
| 61 | /* attributes of acpi_genl_family */ |
| 62 | enum { |
| 63 | ACPI_GENL_ATTR_UNSPEC, |
| 64 | ACPI_GENL_ATTR_EVENT, /* ACPI event info needed by user space */ |
| 65 | __ACPI_GENL_ATTR_MAX, |
| 66 | }; |
| 67 | #define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1) |
| 68 | |
| 69 | /* commands supported by the acpi_genl_family */ |
| 70 | enum { |
| 71 | ACPI_GENL_CMD_UNSPEC, |
| 72 | ACPI_GENL_CMD_EVENT, /* kernel->user notifications for ACPI events */ |
| 73 | __ACPI_GENL_CMD_MAX, |
| 74 | }; |
| 75 | #define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1) |
| 76 | |
| 77 | #define ACPI_GENL_FAMILY_NAME "acpi_event" |
| 78 | #define ACPI_GENL_VERSION 0x01 |
| 79 | #define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group" |
| 80 | |
| 81 | static const struct genl_multicast_group acpi_event_mcgrps[] = { |
| 82 | { .name = ACPI_GENL_MCAST_GROUP_NAME, }, |
| 83 | }; |
| 84 | |
| 85 | static struct genl_family acpi_event_genl_family = { |
| 86 | .id = GENL_ID_GENERATE, |
| 87 | .name = ACPI_GENL_FAMILY_NAME, |
| 88 | .version = ACPI_GENL_VERSION, |
| 89 | .maxattr = ACPI_GENL_ATTR_MAX, |
| 90 | .mcgrps = acpi_event_mcgrps, |
| 91 | .n_mcgrps = ARRAY_SIZE(acpi_event_mcgrps), |
| 92 | }; |
| 93 | |
| 94 | int acpi_bus_generate_netlink_event(const char *device_class, |
| 95 | const char *bus_id, |
| 96 | u8 type, int data) |
| 97 | { |
| 98 | struct sk_buff *skb; |
| 99 | struct nlattr *attr; |
| 100 | struct acpi_genl_event *event; |
| 101 | void *msg_header; |
| 102 | int size; |
| 103 | |
| 104 | /* allocate memory */ |
| 105 | size = nla_total_size(sizeof(struct acpi_genl_event)) + |
| 106 | nla_total_size(0); |
| 107 | |
| 108 | skb = genlmsg_new(size, GFP_ATOMIC); |
| 109 | if (!skb) |
| 110 | return -ENOMEM; |
| 111 | |
| 112 | /* add the genetlink message header */ |
| 113 | msg_header = genlmsg_put(skb, 0, acpi_event_seqnum++, |
| 114 | &acpi_event_genl_family, 0, |
| 115 | ACPI_GENL_CMD_EVENT); |
| 116 | if (!msg_header) { |
| 117 | nlmsg_free(skb); |
| 118 | return -ENOMEM; |
| 119 | } |
| 120 | |
| 121 | /* fill the data */ |
| 122 | attr = |
| 123 | nla_reserve(skb, ACPI_GENL_ATTR_EVENT, |
| 124 | sizeof(struct acpi_genl_event)); |
| 125 | if (!attr) { |
| 126 | nlmsg_free(skb); |
| 127 | return -EINVAL; |
| 128 | } |
| 129 | |
| 130 | event = nla_data(attr); |
| 131 | memset(event, 0, sizeof(struct acpi_genl_event)); |
| 132 | |
| 133 | strcpy(event->device_class, device_class); |
| 134 | strcpy(event->bus_id, bus_id); |
| 135 | event->type = type; |
| 136 | event->data = data; |
| 137 | |
| 138 | /* send multicast genetlink message */ |
| 139 | genlmsg_end(skb, msg_header); |
| 140 | |
| 141 | genlmsg_multicast(&acpi_event_genl_family, skb, 0, 0, GFP_ATOMIC); |
| 142 | return 0; |
| 143 | } |
| 144 | |
| 145 | EXPORT_SYMBOL(acpi_bus_generate_netlink_event); |
| 146 | |
| 147 | static int acpi_event_genetlink_init(void) |
| 148 | { |
| 149 | return genl_register_family(&acpi_event_genl_family); |
| 150 | } |
| 151 | |
| 152 | #else |
| 153 | int acpi_bus_generate_netlink_event(const char *device_class, |
| 154 | const char *bus_id, |
| 155 | u8 type, int data) |
| 156 | { |
| 157 | return 0; |
| 158 | } |
| 159 | |
| 160 | EXPORT_SYMBOL(acpi_bus_generate_netlink_event); |
| 161 | |
| 162 | static int acpi_event_genetlink_init(void) |
| 163 | { |
| 164 | return -ENODEV; |
| 165 | } |
| 166 | #endif |
| 167 | |
| 168 | static int __init acpi_event_init(void) |
| 169 | { |
| 170 | int error = 0; |
| 171 | |
| 172 | if (acpi_disabled) |
| 173 | return 0; |
| 174 | |
| 175 | /* create genetlink for acpi event */ |
| 176 | error = acpi_event_genetlink_init(); |
| 177 | if (error) |
| 178 | printk(KERN_WARNING PREFIX |
| 179 | "Failed to create genetlink family for ACPI event\n"); |
| 180 | return 0; |
| 181 | } |
| 182 | |
| 183 | fs_initcall(acpi_event_init); |