[linux-block.git] / drivers / acpi / event.c

// 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>
 *
 */

#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 = 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
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/*
	3	* event.c - exporting ACPI events via procfs
	4	*
	5	* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
	6	* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
	7	*
	8	*/
	9
	10	#include <linux/spinlock.h>
214f2c90	11	#include <linux/export.h>
1da177e4 LT	12	#include <linux/proc_fs.h>
	13	#include <linux/init.h>
	14	#include <linux/poll.h>
5a0e3ad6	15	#include <linux/gfp.h>
8b48463f	16	#include <linux/acpi.h>
864bdfb9 ZR	17	#include <net/netlink.h>
864bdfb9 ZR	18	#include <net/genetlink.h>
1da177e4	19
a192a958 LB	20	#include "internal.h"
a192a958 LB	21
9ee85241	22	/* ACPI notifier chain */
c8e773fa	23	static BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
9ee85241 ZR	24
	25	int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data)
	26	{
	27	struct acpi_bus_event event;
	28
	29	strcpy(event.device_class, dev->pnp.device_class);
	30	strcpy(event.bus_id, dev->pnp.bus_id);
	31	event.type = type;
	32	event.data = data;
	33	return (blocking_notifier_call_chain(&acpi_chain_head, 0, (void *)&event)
c6237b21	34	== NOTIFY_BAD) ? -EINVAL : 0;
9ee85241 ZR	35	}
	36	EXPORT_SYMBOL(acpi_notifier_call_chain);
	37
	38	int register_acpi_notifier(struct notifier_block *nb)
	39	{
	40	return blocking_notifier_chain_register(&acpi_chain_head, nb);
	41	}
	42	EXPORT_SYMBOL(register_acpi_notifier);
	43
	44	int unregister_acpi_notifier(struct notifier_block *nb)
	45	{
	46	return blocking_notifier_chain_unregister(&acpi_chain_head, nb);
	47	}
	48	EXPORT_SYMBOL(unregister_acpi_notifier);
	49
864bdfb9	50	#ifdef CONFIG_NET
e13d8747	51	static unsigned int acpi_event_seqnum;
864bdfb9 ZR	52	struct acpi_genl_event {
	53	acpi_device_class device_class;
	54	char bus_id[15];
	55	u32 type;
	56	u32 data;
	57	};
	58
	59	/* attributes of acpi_genl_family */
	60	enum {
	61	ACPI_GENL_ATTR_UNSPEC,
	62	ACPI_GENL_ATTR_EVENT, /* ACPI event info needed by user space */
	63	__ACPI_GENL_ATTR_MAX,
	64	};
	65	#define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1)
	66
	67	/* commands supported by the acpi_genl_family */
	68	enum {
	69	ACPI_GENL_CMD_UNSPEC,
	70	ACPI_GENL_CMD_EVENT, /* kernel->user notifications for ACPI events */
	71	__ACPI_GENL_CMD_MAX,
	72	};
	73	#define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1)
	74
9c977a45 ZR	75	#define ACPI_GENL_FAMILY_NAME "acpi_event"
	76	#define ACPI_GENL_VERSION 0x01
	77	#define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group"
864bdfb9	78
2a94fe48 JB	79	static const struct genl_multicast_group acpi_event_mcgrps[] = {
	80	{ .name = ACPI_GENL_MCAST_GROUP_NAME, },
	81	};
	82
56989f6d	83	static struct genl_family acpi_event_genl_family __ro_after_init = {
489111e5	84	.module = THIS_MODULE,
9c977a45	85	.name = ACPI_GENL_FAMILY_NAME,
864bdfb9 ZR	86	.version = ACPI_GENL_VERSION,
864bdfb9 ZR	87	.maxattr = ACPI_GENL_ATTR_MAX,
2a94fe48 JB	88	.mcgrps = acpi_event_mcgrps,
2a94fe48 JB	89	.n_mcgrps = ARRAY_SIZE(acpi_event_mcgrps),
864bdfb9 ZR	90	};
864bdfb9 ZR	91
962ce8ca ZR	92	int acpi_bus_generate_netlink_event(const char *device_class,
962ce8ca ZR	93	const char *bus_id,
864bdfb9 ZR	94	u8 type, int data)
	95	{
	96	struct sk_buff *skb;
	97	struct nlattr *attr;
	98	struct acpi_genl_event *event;
	99	void *msg_header;
	100	int size;
864bdfb9 ZR	101
	102	/* allocate memory */
	103	size = nla_total_size(sizeof(struct acpi_genl_event)) +
	104	nla_total_size(0);
	105
	106	skb = genlmsg_new(size, GFP_ATOMIC);
	107	if (!skb)
	108	return -ENOMEM;
	109
	110	/* add the genetlink message header */
	111	msg_header = genlmsg_put(skb, 0, acpi_event_seqnum++,
	112	&acpi_event_genl_family, 0,
	113	ACPI_GENL_CMD_EVENT);
	114	if (!msg_header) {
	115	nlmsg_free(skb);
	116	return -ENOMEM;
	117	}
	118
	119	/* fill the data */
	120	attr =
	121	nla_reserve(skb, ACPI_GENL_ATTR_EVENT,
	122	sizeof(struct acpi_genl_event));
	123	if (!attr) {
	124	nlmsg_free(skb);
	125	return -EINVAL;
	126	}
	127
	128	event = nla_data(attr);
864bdfb9 ZR	129	memset(event, 0, sizeof(struct acpi_genl_event));
864bdfb9 ZR	130
c7d5f21e GS	131	strscpy(event->device_class, device_class, sizeof(event->device_class));
c7d5f21e GS	132	strscpy(event->bus_id, bus_id, sizeof(event->bus_id));
864bdfb9 ZR	133	event->type = type;
	134	event->data = data;
	135
	136	/* send multicast genetlink message */
053c095a	137	genlmsg_end(skb, msg_header);
864bdfb9	138
2a94fe48	139	genlmsg_multicast(&acpi_event_genl_family, skb, 0, 0, GFP_ATOMIC);
864bdfb9 ZR	140	return 0;
864bdfb9 ZR	141	}
864bdfb9	142
962ce8ca ZR	143	EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
962ce8ca ZR	144
56989f6d	145	static int __init acpi_event_genetlink_init(void)
864bdfb9	146	{
2a94fe48	147	return genl_register_family(&acpi_event_genl_family);
864bdfb9 ZR	148	}
	149
	150	#else
3e069ee0 LB	151	int acpi_bus_generate_netlink_event(const char *device_class,
	152	const char *bus_id,
	153	u8 type, int data)
864bdfb9 ZR	154	{
	155	return 0;
	156	}
864bdfb9	157
66baf327	158	EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
962ce8ca	159
864bdfb9 ZR	160	static int acpi_event_genetlink_init(void)
	161	{
	162	return -ENODEV;
	163	}
	164	#endif
	165
1da177e4 LT	166	static int __init acpi_event_init(void)
1da177e4 LT	167	{
1da177e4 LT	168	int error = 0;
1da177e4 LT	169
1da177e4	170	if (acpi_disabled)
d550d98d	171	return 0;
1da177e4	172
864bdfb9 ZR	173	/* create genetlink for acpi event */
	174	error = acpi_event_genetlink_init();
	175	if (error)
	176	printk(KERN_WARNING PREFIX
	177	"Failed to create genetlink family for ACPI event\n");
864bdfb9	178	return 0;
1da177e4 LT	179	}
1da177e4 LT	180
864bdfb9	181	fs_initcall(acpi_event_init);