#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")
+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;
static int chars_remaining = 0;
static char *ptr;
- ACPI_FUNCTION_TRACE("acpi_system_read_event");
-
if (!chars_remaining) {
memset(&event, 0, sizeof(struct acpi_bus_event));
if ((file->f_flags & O_NONBLOCK)
&& (list_empty(&acpi_bus_event_list)))
- return_VALUE(-EAGAIN);
+ return -EAGAIN;
result = acpi_bus_receive_event(&event);
- if (result) {
- return_VALUE(-EIO);
- }
+ if (result)
+ return result;
chars_remaining = sprintf(str, "%s %s %08x %08x\n",
event.device_class ? event.
}
if (copy_to_user(buffer, ptr, count))
- return_VALUE(-EFAULT);
+ return -EFAULT;
*ppos += count;
chars_remaining -= count;
ptr += count;
- return_VALUE(count);
+ return count;
}
static int acpi_system_close_event(struct inode *inode, struct file *file)
return 0;
}
-static struct file_operations acpi_system_event_ops = {
+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;
- ACPI_FUNCTION_TRACE("acpi_event_init");
-
if (acpi_disabled)
- return_VALUE(0);
+ 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 = create_proc_entry("event", S_IRUSR, acpi_root_dir);
- if (entry)
- entry->proc_fops = &acpi_system_event_ops;
- else {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Unable to create '%s' proc fs entry\n",
- "event"));
- error = -EFAULT;
- }
- return_VALUE(error);
+ entry = proc_create("event", S_IRUSR, acpi_root_dir,
+ &acpi_system_event_ops);
+ if (!entry)
+ return -ENODEV;
+#endif
+
+ return 0;
}
-subsys_initcall(acpi_event_init);
+fs_initcall(acpi_event_init);