diff options
Diffstat (limited to 'drivers/acpi/event.c')
| -rw-r--r-- | drivers/acpi/event.c | 165 |
1 files changed, 158 insertions, 7 deletions
diff --git a/drivers/acpi/event.c b/drivers/acpi/event.c index 3b23562e6f92..5c95863f8fa9 100644 --- a/drivers/acpi/event.c +++ b/drivers/acpi/event.c @@ -11,10 +11,13 @@ #include <linux/init.h> #include <linux/poll.h> #include <acpi/acpi_drivers.h> +#include <net/netlink.h> +#include <net/genetlink.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; @@ -48,7 +51,6 @@ acpi_system_read_event(struct file *file, char __user * buffer, size_t count, static int chars_remaining = 0; static char *ptr; - if (!chars_remaining) { memset(&event, 0, sizeof(struct acpi_bus_event)); @@ -105,24 +107,173 @@ static const struct file_operations acpi_system_event_ops = { .release = acpi_system_close_event, .poll = acpi_system_poll_event, }; +#endif /* CONFIG_ACPI_PROC_EVENT */ + +#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; + } + + result = + genlmsg_multicast(skb, 0, acpi_event_mcgrp.id, GFP_ATOMIC); + if (result) + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Failed to send a Genetlink message!\n")); + 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 = create_proc_entry("event", S_IRUSR, acpi_root_dir); if (entry) entry->proc_fops = &acpi_system_event_ops; - else { - error = -ENODEV; - } - return error; + else + return -ENODEV; +#endif + + return 0; } -subsys_initcall(acpi_event_init); +fs_initcall(acpi_event_init); |