[mirror_ubuntu-zesty-kernel.git] / drivers / acpi / event.c

/*
 * 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 <linux/acpi.h>
#include <net/netlink.h>
#include <net/genetlink.h>

#include "internal.h"

#define _COMPONENT		ACPI_SYSTEM_COMPONENT
ACPI_MODULE_NAME("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 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));

	strcpy(event->device_class, device_class);
	strcpy(event->bus_id, 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 = 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");
	return 0;
}

fs_initcall(acpi_event_init);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* event.c - exporting ACPI events via procfs
	3	*
	4	* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
	5	* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
	6	*
	7	*/
	8
	9	#include <linux/spinlock.h>
214f2c90	10	#include <linux/export.h>
1da177e4 LT	11	#include <linux/proc_fs.h>
	12	#include <linux/init.h>
	13	#include <linux/poll.h>
5a0e3ad6	14	#include <linux/gfp.h>
8b48463f	15	#include <linux/acpi.h>
864bdfb9 ZR	16	#include <net/netlink.h>
864bdfb9 ZR	17	#include <net/genetlink.h>
1da177e4	18
a192a958 LB	19	#include "internal.h"
a192a958 LB	20
1da177e4	21	#define _COMPONENT ACPI_SYSTEM_COMPONENT
f52fd66d	22	ACPI_MODULE_NAME("event");
1da177e4	23
9ee85241	24	/* ACPI notifier chain */
c8e773fa	25	static BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
9ee85241 ZR	26
	27	int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data)
	28	{
	29	struct acpi_bus_event event;
	30
	31	strcpy(event.device_class, dev->pnp.device_class);
	32	strcpy(event.bus_id, dev->pnp.bus_id);
	33	event.type = type;
	34	event.data = data;
	35	return (blocking_notifier_call_chain(&acpi_chain_head, 0, (void *)&event)
	36	== NOTIFY_BAD) ? -EINVAL : 0;
	37	}
	38	EXPORT_SYMBOL(acpi_notifier_call_chain);
	39
	40	int register_acpi_notifier(struct notifier_block *nb)
	41	{
	42	return blocking_notifier_chain_register(&acpi_chain_head, nb);
	43	}
	44	EXPORT_SYMBOL(register_acpi_notifier);
	45
	46	int unregister_acpi_notifier(struct notifier_block *nb)
	47	{
	48	return blocking_notifier_chain_unregister(&acpi_chain_head, nb);
	49	}
	50	EXPORT_SYMBOL(unregister_acpi_notifier);
	51
864bdfb9	52	#ifdef CONFIG_NET
e13d8747	53	static unsigned int acpi_event_seqnum;
864bdfb9 ZR	54	struct acpi_genl_event {
	55	acpi_device_class device_class;
	56	char bus_id[15];
	57	u32 type;
	58	u32 data;
	59	};
	60
	61	/* attributes of acpi_genl_family */
	62	enum {
	63	ACPI_GENL_ATTR_UNSPEC,
	64	ACPI_GENL_ATTR_EVENT, /* ACPI event info needed by user space */
	65	__ACPI_GENL_ATTR_MAX,
	66	};
	67	#define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1)
	68
	69	/* commands supported by the acpi_genl_family */
	70	enum {
	71	ACPI_GENL_CMD_UNSPEC,
	72	ACPI_GENL_CMD_EVENT, /* kernel->user notifications for ACPI events */
	73	__ACPI_GENL_CMD_MAX,
	74	};
	75	#define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1)
	76
9c977a45 ZR	77	#define ACPI_GENL_FAMILY_NAME "acpi_event"
	78	#define ACPI_GENL_VERSION 0x01
	79	#define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group"
864bdfb9	80
2a94fe48 JB	81	static const struct genl_multicast_group acpi_event_mcgrps[] = {
	82	{ .name = ACPI_GENL_MCAST_GROUP_NAME, },
	83	};
	84
56989f6d	85	static struct genl_family acpi_event_genl_family __ro_after_init = {
489111e5	86	.module = THIS_MODULE,
9c977a45	87	.name = ACPI_GENL_FAMILY_NAME,
864bdfb9 ZR	88	.version = ACPI_GENL_VERSION,
864bdfb9 ZR	89	.maxattr = ACPI_GENL_ATTR_MAX,
2a94fe48 JB	90	.mcgrps = acpi_event_mcgrps,
2a94fe48 JB	91	.n_mcgrps = ARRAY_SIZE(acpi_event_mcgrps),
864bdfb9 ZR	92	};
864bdfb9 ZR	93
962ce8ca ZR	94	int acpi_bus_generate_netlink_event(const char *device_class,
962ce8ca ZR	95	const char *bus_id,
864bdfb9 ZR	96	u8 type, int data)
	97	{
	98	struct sk_buff *skb;
	99	struct nlattr *attr;
	100	struct acpi_genl_event *event;
	101	void *msg_header;
	102	int size;
864bdfb9 ZR	103
	104	/* allocate memory */
	105	size = nla_total_size(sizeof(struct acpi_genl_event)) +
	106	nla_total_size(0);
	107
	108	skb = genlmsg_new(size, GFP_ATOMIC);
	109	if (!skb)
	110	return -ENOMEM;
	111
	112	/* add the genetlink message header */
	113	msg_header = genlmsg_put(skb, 0, acpi_event_seqnum++,
	114	&acpi_event_genl_family, 0,
	115	ACPI_GENL_CMD_EVENT);
	116	if (!msg_header) {
	117	nlmsg_free(skb);
	118	return -ENOMEM;
	119	}
	120
	121	/* fill the data */
	122	attr =
	123	nla_reserve(skb, ACPI_GENL_ATTR_EVENT,
	124	sizeof(struct acpi_genl_event));
	125	if (!attr) {
	126	nlmsg_free(skb);
	127	return -EINVAL;
	128	}
	129
	130	event = nla_data(attr);
864bdfb9 ZR	131	memset(event, 0, sizeof(struct acpi_genl_event));
864bdfb9 ZR	132
962ce8ca ZR	133	strcpy(event->device_class, device_class);
962ce8ca ZR	134	strcpy(event->bus_id, bus_id);
864bdfb9 ZR	135	event->type = type;
	136	event->data = data;
	137
	138	/* send multicast genetlink message */
053c095a	139	genlmsg_end(skb, msg_header);
864bdfb9	140
2a94fe48	141	genlmsg_multicast(&acpi_event_genl_family, skb, 0, 0, GFP_ATOMIC);
864bdfb9 ZR	142	return 0;
864bdfb9 ZR	143	}
864bdfb9	144
962ce8ca ZR	145	EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
962ce8ca ZR	146
56989f6d	147	static int __init acpi_event_genetlink_init(void)
864bdfb9	148	{
2a94fe48	149	return genl_register_family(&acpi_event_genl_family);
864bdfb9 ZR	150	}
	151
	152	#else
3e069ee0 LB	153	int acpi_bus_generate_netlink_event(const char *device_class,
	154	const char *bus_id,
	155	u8 type, int data)
864bdfb9 ZR	156	{
	157	return 0;
	158	}
864bdfb9	159
66baf327	160	EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
962ce8ca	161
864bdfb9 ZR	162	static int acpi_event_genetlink_init(void)
	163	{
	164	return -ENODEV;
	165	}
	166	#endif
	167
1da177e4 LT	168	static int __init acpi_event_init(void)
1da177e4 LT	169	{
1da177e4 LT	170	int error = 0;
1da177e4 LT	171
1da177e4	172	if (acpi_disabled)
d550d98d	173	return 0;
1da177e4	174
864bdfb9 ZR	175	/* create genetlink for acpi event */
	176	error = acpi_event_genetlink_init();
	177	if (error)
	178	printk(KERN_WARNING PREFIX
	179	"Failed to create genetlink family for ACPI event\n");
864bdfb9	180	return 0;
1da177e4 LT	181	}
1da177e4 LT	182
864bdfb9	183	fs_initcall(acpi_event_init);