/* * 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 = { .id = GENL_ID_GENERATE, .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 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);