1 files changed, 308 insertions, 0 deletions
diff --git a/drivers/acpi/event.c b/drivers/acpi/event.c
new file mode 100644
index 00000000..1442737c
--- /dev/null
+++ b/drivers/acpi/event.c
@@ -0,0 +1,308 @@
+/*
+ * 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 <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,
+	.llseek = default_llseek,
+};
+#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);