/* * 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/proc_fs.h> #include <linux/init.h> #include <linux/poll.h> #include <acpi/acpi_drivers.h> #include <net/netlink.h> #include <net/genetlink.h> #include "internal.h" #define _COMPONENT ACPI_SYSTEM_COMPONENT ACPI_MODULE_NAME("event"); #ifdef CONFIG_ACPI_PROC_EVENT /* Global vars for handling event proc entry */ static DEFINE_SPINLOCK(acpi_system_event_lock); int event_is_open = 0; extern struct list_head acpi_bus_event_list; extern wait_queue_head_t acpi_bus_event_queue; static int acpi_system_open_event(struct inode *inode, struct file *file) { spin_lock_irq(&acpi_system_event_lock); if (event_is_open) goto out_busy; event_is_open = 1; spin_unlock_irq(&acpi_system_event_lock); return 0; out_busy: spin_unlock_irq(&acpi_system_event_lock); return -EBUSY; } static ssize_t acpi_system_read_event(struct file *file, char __user * buffer, size_t count, loff_t * ppos) { int result = 0; struct acpi_bus_event event; static char str[ACPI_MAX_STRING]; static int chars_remaining = 0; static char *ptr; if (!chars_remaining) { memset(&event, 0, sizeof(struct acpi_bus_event)); if ((file->f_flags & O_NONBLOCK) && (list_empty(&acpi_bus_event_list))) return -EAGAIN; result = acpi_bus_receive_event(&event); if (result) return result; chars_remaining = sprintf(str, "%s %s %08x %08x\n", event.device_class ? event. device_class : "<unknown>", event.bus_id ? event. bus_id : "<unknown>", event.type, event.data); ptr = str; } if (chars_remaining < count) { count = chars_remaining; } if (copy_to_user(buffer, ptr, count)) return -EFAULT; *ppos += count; chars_remaining -= count; ptr += count; return count; } static int acpi_system_close_event(struct inode *inode, struct file *file) { spin_lock_irq(&acpi_system_event_lock); event_is_open = 0; spin_unlock_irq(&acpi_system_event_lock); return 0; } static unsigned int acpi_system_poll_event(struct file *file, poll_table * wait) { poll_wait(file, &acpi_bus_event_queue, wait); if (!list_empty(&acpi_bus_event_list)) return POLLIN | POLLRDNORM; return 0; } static const struct file_operations acpi_system_event_ops = { .owner = THIS_MODULE, .open = acpi_system_open_event, .read = acpi_system_read_event, .release = acpi_system_close_event, .poll = acpi_system_poll_event, }; #endif /* CONFIG_ACPI_PROC_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 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, }; static struct genl_multicast_group acpi_event_mcgrp = { .name = ACPI_GENL_MCAST_GROUP_NAME, }; 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; int result; /* 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); if (!event) { nlmsg_free(skb); return -EINVAL; } 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 */ result = genlmsg_end(skb, msg_header); if (result < 0) { nlmsg_free(skb); return result; } genlmsg_multicast(skb, 0, acpi_event_mcgrp.id, GFP_ATOMIC); return 0; } EXPORT_SYMBOL(acpi_bus_generate_netlink_event); static int acpi_event_genetlink_init(void) { int result; result = genl_register_family(&acpi_event_genl_family); if (result) return result; result = genl_register_mc_group(&acpi_event_genl_family, &acpi_event_mcgrp); if (result) genl_unregister_family(&acpi_event_genl_family); return result; } #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) { #ifdef CONFIG_ACPI_PROC_EVENT struct proc_dir_entry *entry; #endif 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"); #ifdef CONFIG_ACPI_PROC_EVENT /* 'event' [R] */ entry = proc_create("event", S_IRUSR, acpi_root_dir, &acpi_system_event_ops); if (!entry) return -ENODEV; #endif return 0; } fs_initcall(acpi_event_init);