[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"

#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
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
1da177e4	22	#define _COMPONENT ACPI_SYSTEM_COMPONENT
f52fd66d	23	ACPI_MODULE_NAME("event");
1da177e4	24
9ee85241	25	/* ACPI notifier chain */
c8e773fa	26	static BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
9ee85241 ZR	27
	28	int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data)
	29	{
	30	struct acpi_bus_event event;
	31
	32	strcpy(event.device_class, dev->pnp.device_class);
	33	strcpy(event.bus_id, dev->pnp.bus_id);
	34	event.type = type;
	35	event.data = data;
	36	return (blocking_notifier_call_chain(&acpi_chain_head, 0, (void *)&event)
	37	== NOTIFY_BAD) ? -EINVAL : 0;
	38	}
	39	EXPORT_SYMBOL(acpi_notifier_call_chain);
	40
	41	int register_acpi_notifier(struct notifier_block *nb)
	42	{
	43	return blocking_notifier_chain_register(&acpi_chain_head, nb);
	44	}
	45	EXPORT_SYMBOL(register_acpi_notifier);
	46
	47	int unregister_acpi_notifier(struct notifier_block *nb)
	48	{
	49	return blocking_notifier_chain_unregister(&acpi_chain_head, nb);
	50	}
	51	EXPORT_SYMBOL(unregister_acpi_notifier);
	52
864bdfb9	53	#ifdef CONFIG_NET
e13d8747	54	static unsigned int acpi_event_seqnum;
864bdfb9 ZR	55	struct acpi_genl_event {
	56	acpi_device_class device_class;
	57	char bus_id[15];
	58	u32 type;
	59	u32 data;
	60	};
	61
	62	/* attributes of acpi_genl_family */
	63	enum {
	64	ACPI_GENL_ATTR_UNSPEC,
	65	ACPI_GENL_ATTR_EVENT, /* ACPI event info needed by user space */
	66	__ACPI_GENL_ATTR_MAX,
	67	};
	68	#define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1)
	69
	70	/* commands supported by the acpi_genl_family */
	71	enum {
	72	ACPI_GENL_CMD_UNSPEC,
	73	ACPI_GENL_CMD_EVENT, /* kernel->user notifications for ACPI events */
	74	__ACPI_GENL_CMD_MAX,
	75	};
	76	#define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1)
	77
9c977a45 ZR	78	#define ACPI_GENL_FAMILY_NAME "acpi_event"
	79	#define ACPI_GENL_VERSION 0x01
	80	#define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group"
864bdfb9	81
2a94fe48 JB	82	static const struct genl_multicast_group acpi_event_mcgrps[] = {
	83	{ .name = ACPI_GENL_MCAST_GROUP_NAME, },
	84	};
	85
56989f6d	86	static struct genl_family acpi_event_genl_family __ro_after_init = {
489111e5	87	.module = THIS_MODULE,
9c977a45	88	.name = ACPI_GENL_FAMILY_NAME,
864bdfb9 ZR	89	.version = ACPI_GENL_VERSION,
864bdfb9 ZR	90	.maxattr = ACPI_GENL_ATTR_MAX,
2a94fe48 JB	91	.mcgrps = acpi_event_mcgrps,
2a94fe48 JB	92	.n_mcgrps = ARRAY_SIZE(acpi_event_mcgrps),
864bdfb9 ZR	93	};
864bdfb9 ZR	94
962ce8ca ZR	95	int acpi_bus_generate_netlink_event(const char *device_class,
962ce8ca ZR	96	const char *bus_id,
864bdfb9 ZR	97	u8 type, int data)
	98	{
	99	struct sk_buff *skb;
	100	struct nlattr *attr;
	101	struct acpi_genl_event *event;
	102	void *msg_header;
	103	int size;
864bdfb9 ZR	104
	105	/* allocate memory */
	106	size = nla_total_size(sizeof(struct acpi_genl_event)) +
	107	nla_total_size(0);
	108
	109	skb = genlmsg_new(size, GFP_ATOMIC);
	110	if (!skb)
	111	return -ENOMEM;
	112
	113	/* add the genetlink message header */
	114	msg_header = genlmsg_put(skb, 0, acpi_event_seqnum++,
	115	&acpi_event_genl_family, 0,
	116	ACPI_GENL_CMD_EVENT);
	117	if (!msg_header) {
	118	nlmsg_free(skb);
	119	return -ENOMEM;
	120	}
	121
	122	/* fill the data */
	123	attr =
	124	nla_reserve(skb, ACPI_GENL_ATTR_EVENT,
	125	sizeof(struct acpi_genl_event));
	126	if (!attr) {
	127	nlmsg_free(skb);
	128	return -EINVAL;
	129	}
	130
	131	event = nla_data(attr);
864bdfb9 ZR	132	memset(event, 0, sizeof(struct acpi_genl_event));
864bdfb9 ZR	133
962ce8ca ZR	134	strcpy(event->device_class, device_class);
962ce8ca ZR	135	strcpy(event->bus_id, bus_id);
864bdfb9 ZR	136	event->type = type;
	137	event->data = data;
	138
	139	/* send multicast genetlink message */
053c095a	140	genlmsg_end(skb, msg_header);
864bdfb9	141
2a94fe48	142	genlmsg_multicast(&acpi_event_genl_family, skb, 0, 0, GFP_ATOMIC);
864bdfb9 ZR	143	return 0;
864bdfb9 ZR	144	}
864bdfb9	145
962ce8ca ZR	146	EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
962ce8ca ZR	147
56989f6d	148	static int __init acpi_event_genetlink_init(void)
864bdfb9	149	{
2a94fe48	150	return genl_register_family(&acpi_event_genl_family);
864bdfb9 ZR	151	}
	152
	153	#else
3e069ee0 LB	154	int acpi_bus_generate_netlink_event(const char *device_class,
	155	const char *bus_id,
	156	u8 type, int data)
864bdfb9 ZR	157	{
	158	return 0;
	159	}
864bdfb9	160
66baf327	161	EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
962ce8ca	162
864bdfb9 ZR	163	static int acpi_event_genetlink_init(void)
	164	{
	165	return -ENODEV;
	166	}
	167	#endif
	168
1da177e4 LT	169	static int __init acpi_event_init(void)
1da177e4 LT	170	{
1da177e4 LT	171	int error = 0;
1da177e4 LT	172
1da177e4	173	if (acpi_disabled)
d550d98d	174	return 0;
1da177e4	175
864bdfb9 ZR	176	/* create genetlink for acpi event */
	177	error = acpi_event_genetlink_init();
	178	if (error)
	179	printk(KERN_WARNING PREFIX
	180	"Failed to create genetlink family for ACPI event\n");
864bdfb9	181	return 0;
1da177e4 LT	182	}
1da177e4 LT	183
864bdfb9	184	fs_initcall(acpi_event_init);