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![Zhang Rui](/assets/img/avatar_default.png)
Kernel mode graphics drivers need this ACPI notifier chaine so that they can get notified upon hotkey events. Signed-off-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
307 lines
6.8 KiB
C
307 lines
6.8 KiB
C
/*
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* event.c - exporting ACPI events via procfs
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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*
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*/
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#include <linux/spinlock.h>
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#include <linux/proc_fs.h>
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#include <linux/init.h>
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#include <linux/poll.h>
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#include <acpi/acpi_drivers.h>
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#include <net/netlink.h>
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#include <net/genetlink.h>
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#define _COMPONENT ACPI_SYSTEM_COMPONENT
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ACPI_MODULE_NAME("event");
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#ifdef CONFIG_ACPI_PROC_EVENT
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/* Global vars for handling event proc entry */
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static DEFINE_SPINLOCK(acpi_system_event_lock);
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int event_is_open = 0;
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extern struct list_head acpi_bus_event_list;
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extern wait_queue_head_t acpi_bus_event_queue;
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static int acpi_system_open_event(struct inode *inode, struct file *file)
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{
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spin_lock_irq(&acpi_system_event_lock);
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if (event_is_open)
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goto out_busy;
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event_is_open = 1;
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spin_unlock_irq(&acpi_system_event_lock);
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return 0;
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out_busy:
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spin_unlock_irq(&acpi_system_event_lock);
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return -EBUSY;
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}
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static ssize_t
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acpi_system_read_event(struct file *file, char __user * buffer, size_t count,
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loff_t * ppos)
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{
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int result = 0;
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struct acpi_bus_event event;
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static char str[ACPI_MAX_STRING];
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static int chars_remaining = 0;
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static char *ptr;
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if (!chars_remaining) {
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memset(&event, 0, sizeof(struct acpi_bus_event));
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if ((file->f_flags & O_NONBLOCK)
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&& (list_empty(&acpi_bus_event_list)))
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return -EAGAIN;
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result = acpi_bus_receive_event(&event);
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if (result)
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return result;
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chars_remaining = sprintf(str, "%s %s %08x %08x\n",
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event.device_class ? event.
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device_class : "<unknown>",
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event.bus_id ? event.
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bus_id : "<unknown>", event.type,
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event.data);
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ptr = str;
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}
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if (chars_remaining < count) {
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count = chars_remaining;
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}
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if (copy_to_user(buffer, ptr, count))
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return -EFAULT;
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*ppos += count;
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chars_remaining -= count;
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ptr += count;
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return count;
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}
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static int acpi_system_close_event(struct inode *inode, struct file *file)
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{
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spin_lock_irq(&acpi_system_event_lock);
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event_is_open = 0;
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spin_unlock_irq(&acpi_system_event_lock);
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return 0;
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}
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static unsigned int acpi_system_poll_event(struct file *file, poll_table * wait)
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{
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poll_wait(file, &acpi_bus_event_queue, wait);
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if (!list_empty(&acpi_bus_event_list))
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return POLLIN | POLLRDNORM;
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return 0;
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}
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static const struct file_operations acpi_system_event_ops = {
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.open = acpi_system_open_event,
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.read = acpi_system_read_event,
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.release = acpi_system_close_event,
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.poll = acpi_system_poll_event,
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};
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#endif /* CONFIG_ACPI_PROC_EVENT */
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/* ACPI notifier chain */
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BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
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int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data)
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{
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struct acpi_bus_event event;
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strcpy(event.device_class, dev->pnp.device_class);
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strcpy(event.bus_id, dev->pnp.bus_id);
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event.type = type;
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event.data = data;
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return (blocking_notifier_call_chain(&acpi_chain_head, 0, (void *)&event)
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== NOTIFY_BAD) ? -EINVAL : 0;
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}
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EXPORT_SYMBOL(acpi_notifier_call_chain);
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int register_acpi_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&acpi_chain_head, nb);
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}
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EXPORT_SYMBOL(register_acpi_notifier);
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int unregister_acpi_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_unregister(&acpi_chain_head, nb);
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}
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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 {
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acpi_device_class device_class;
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char bus_id[15];
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u32 type;
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u32 data;
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};
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/* attributes of acpi_genl_family */
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enum {
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ACPI_GENL_ATTR_UNSPEC,
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ACPI_GENL_ATTR_EVENT, /* ACPI event info needed by user space */
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__ACPI_GENL_ATTR_MAX,
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};
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#define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1)
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/* commands supported by the acpi_genl_family */
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enum {
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ACPI_GENL_CMD_UNSPEC,
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ACPI_GENL_CMD_EVENT, /* kernel->user notifications for ACPI events */
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__ACPI_GENL_CMD_MAX,
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};
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#define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1)
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#define ACPI_GENL_FAMILY_NAME "acpi_event"
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#define ACPI_GENL_VERSION 0x01
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#define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group"
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static struct genl_family acpi_event_genl_family = {
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.id = GENL_ID_GENERATE,
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.name = ACPI_GENL_FAMILY_NAME,
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.version = ACPI_GENL_VERSION,
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.maxattr = ACPI_GENL_ATTR_MAX,
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};
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static struct genl_multicast_group acpi_event_mcgrp = {
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.name = ACPI_GENL_MCAST_GROUP_NAME,
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};
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int acpi_bus_generate_netlink_event(const char *device_class,
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const char *bus_id,
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u8 type, int data)
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{
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struct sk_buff *skb;
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struct nlattr *attr;
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struct acpi_genl_event *event;
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void *msg_header;
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int size;
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int result;
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/* allocate memory */
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size = nla_total_size(sizeof(struct acpi_genl_event)) +
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nla_total_size(0);
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skb = genlmsg_new(size, GFP_ATOMIC);
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if (!skb)
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return -ENOMEM;
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/* add the genetlink message header */
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msg_header = genlmsg_put(skb, 0, acpi_event_seqnum++,
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&acpi_event_genl_family, 0,
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ACPI_GENL_CMD_EVENT);
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if (!msg_header) {
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nlmsg_free(skb);
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return -ENOMEM;
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}
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/* fill the data */
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attr =
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nla_reserve(skb, ACPI_GENL_ATTR_EVENT,
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sizeof(struct acpi_genl_event));
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if (!attr) {
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nlmsg_free(skb);
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return -EINVAL;
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}
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event = nla_data(attr);
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if (!event) {
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nlmsg_free(skb);
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return -EINVAL;
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}
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memset(event, 0, sizeof(struct acpi_genl_event));
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strcpy(event->device_class, device_class);
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strcpy(event->bus_id, bus_id);
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event->type = type;
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event->data = data;
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/* send multicast genetlink message */
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result = genlmsg_end(skb, msg_header);
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if (result < 0) {
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nlmsg_free(skb);
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return result;
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}
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result =
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genlmsg_multicast(skb, 0, acpi_event_mcgrp.id, GFP_ATOMIC);
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if (result)
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Failed to send a Genetlink message!\n"));
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return 0;
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}
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EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
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static int acpi_event_genetlink_init(void)
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{
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int result;
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result = genl_register_family(&acpi_event_genl_family);
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if (result)
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return result;
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result = genl_register_mc_group(&acpi_event_genl_family,
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&acpi_event_mcgrp);
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if (result)
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genl_unregister_family(&acpi_event_genl_family);
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return result;
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}
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#else
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int acpi_bus_generate_netlink_event(const char *device_class,
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const char *bus_id,
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u8 type, int data)
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{
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return 0;
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}
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EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
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static int acpi_event_genetlink_init(void)
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{
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return -ENODEV;
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}
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#endif
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static int __init acpi_event_init(void)
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{
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#ifdef CONFIG_ACPI_PROC_EVENT
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struct proc_dir_entry *entry;
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#endif
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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 */
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error = acpi_event_genetlink_init();
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if (error)
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printk(KERN_WARNING PREFIX
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"Failed to create genetlink family for ACPI event\n");
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#ifdef CONFIG_ACPI_PROC_EVENT
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/* 'event' [R] */
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entry = create_proc_entry("event", S_IRUSR, acpi_root_dir);
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if (entry)
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entry->proc_fops = &acpi_system_event_ops;
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else
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return -ENODEV;
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#endif
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return 0;
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}
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fs_initcall(acpi_event_init);
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