diff options
Diffstat (limited to 'drivers/acpi/event.c')
| -rw-r--r-- | drivers/acpi/event.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/drivers/acpi/event.c b/drivers/acpi/event.c new file mode 100644 index 000000000..d199a19bb --- /dev/null +++ b/drivers/acpi/event.c @@ -0,0 +1,183 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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> + * + */ + +#define pr_fmt(fmt) "ACPI: " fmt + +#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 <linux/acpi.h> +#include <net/netlink.h> +#include <net/genetlink.h> + +#include "internal.h" + +/* 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 const struct genl_multicast_group acpi_event_mcgrps[] = { + { .name = ACPI_GENL_MCAST_GROUP_NAME, }, +}; + +static struct genl_family acpi_event_genl_family __ro_after_init = { + .module = THIS_MODULE, + .name = ACPI_GENL_FAMILY_NAME, + .version = ACPI_GENL_VERSION, + .maxattr = ACPI_GENL_ATTR_MAX, + .mcgrps = acpi_event_mcgrps, + .n_mcgrps = ARRAY_SIZE(acpi_event_mcgrps), +}; + +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; + + /* 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); + memset(event, 0, sizeof(struct acpi_genl_event)); + + strscpy(event->device_class, device_class, sizeof(event->device_class)); + strscpy(event->bus_id, bus_id, sizeof(event->bus_id)); + event->type = type; + event->data = data; + + /* send multicast genetlink message */ + genlmsg_end(skb, msg_header); + + genlmsg_multicast(&acpi_event_genl_family, skb, 0, 0, GFP_ATOMIC); + return 0; +} + +EXPORT_SYMBOL(acpi_bus_generate_netlink_event); + +static int __init acpi_event_genetlink_init(void) +{ + return genl_register_family(&acpi_event_genl_family); +} + +#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) +{ + int error; + + if (acpi_disabled) + return 0; + + /* create genetlink for acpi event */ + error = acpi_event_genetlink_init(); + if (error) + pr_warn("Failed to create genetlink family for ACPI event\n"); + + return 0; +} + +fs_initcall(acpi_event_init); |