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

/*
 * event.c - exporting ACPI events via procfs
 *
 *  Copyright (C) 2001, 2002 Andy Grover <[email protected]>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]>
 *
 */

#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 <acpi/acpi_drivers.h>
#include <net/netlink.h>
#include <net/genetlink.h>

#include "internal.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;
extern struct list_head acpi_bus_event_list;
extern wait_queue_head_t acpi_bus_event_queue;

static int acpi_system_open_event(struct inode *inode, struct file *file)
{
	spin_lock_irq(&acpi_system_event_lock);

	if (event_is_open)
		goto out_busy;

	event_is_open = 1;

	spin_unlock_irq(&acpi_system_event_lock);
	return 0;

      out_busy:
	spin_unlock_irq(&acpi_system_event_lock);
	return -EBUSY;
}

static ssize_t
acpi_system_read_event(struct file *file, char __user * buffer, size_t count,
		       loff_t * ppos)
{
	int result = 0;
	struct acpi_bus_event event;
	static char str[ACPI_MAX_STRING];
	static int chars_remaining = 0;
	static char *ptr;

	if (!chars_remaining) {
		memset(&event, 0, sizeof(struct acpi_bus_event));

		if ((file->f_flags & O_NONBLOCK)
		    && (list_empty(&acpi_bus_event_list)))
			return -EAGAIN;

		result = acpi_bus_receive_event(&event);
		if (result)
			return result;

		chars_remaining = sprintf(str, "%s %s %08x %08x\n",
					  event.device_class ? event.
					  device_class : "<unknown>",
					  event.bus_id ? event.
					  bus_id : "<unknown>", event.type,
					  event.data);
		ptr = str;
	}

	if (chars_remaining < count) {
		count = chars_remaining;
	}

	if (copy_to_user(buffer, ptr, count))
		return -EFAULT;

	*ppos += count;
	chars_remaining -= count;
	ptr += count;

	return count;
}

static int acpi_system_close_event(struct inode *inode, struct file *file)
{
	spin_lock_irq(&acpi_system_event_lock);
	event_is_open = 0;
	spin_unlock_irq(&acpi_system_event_lock);
	return 0;
}

static unsigned int acpi_system_poll_event(struct file *file, poll_table * wait)
{
	poll_wait(file, &acpi_bus_event_queue, wait);
	if (!list_empty(&acpi_bus_event_list))
		return POLLIN | POLLRDNORM;
	return 0;
}

static const struct file_operations acpi_system_event_ops = {
	.owner = THIS_MODULE,
	.open = acpi_system_open_event,
	.read = acpi_system_read_event,
	.release = acpi_system_close_event,
	.poll = acpi_system_poll_event,
	.llseek = default_llseek,
};
#endif	/* CONFIG_ACPI_PROC_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 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;
	}

	genlmsg_multicast(skb, 0, acpi_event_mcgrp.id, GFP_ATOMIC);
	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 = proc_create("event", S_IRUSR, acpi_root_dir,
			    &acpi_system_event_ops);
	if (!entry)
		return -ENODEV;
#endif

	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 <[email protected]>
	5	* Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]>
	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>
1da177e4	15	#include <acpi/acpi_drivers.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
14e04fb3	24	#ifdef CONFIG_ACPI_PROC_EVENT
1da177e4 LT	25	/* Global vars for handling event proc entry */
1da177e4 LT	26	static DEFINE_SPINLOCK(acpi_system_event_lock);
4be44fcd LB	27	int event_is_open = 0;
	28	extern struct list_head acpi_bus_event_list;
	29	extern wait_queue_head_t acpi_bus_event_queue;
1da177e4	30
4be44fcd	31	static int acpi_system_open_event(struct inode inode, struct file file)
1da177e4	32	{
c65ade4d	33	spin_lock_irq(&acpi_system_event_lock);
1da177e4	34
c65ade4d	35	if (event_is_open)
1da177e4 LT	36	goto out_busy;
	37
	38	event_is_open = 1;
	39
c65ade4d	40	spin_unlock_irq(&acpi_system_event_lock);
1da177e4 LT	41	return 0;
1da177e4 LT	42
4be44fcd	43	out_busy:
c65ade4d	44	spin_unlock_irq(&acpi_system_event_lock);
1da177e4 LT	45	return -EBUSY;
	46	}
	47
	48	static ssize_t
4be44fcd LB	49	acpi_system_read_event(struct file file, char __user buffer, size_t count,
4be44fcd LB	50	loff_t * ppos)
1da177e4	51	{
4be44fcd LB	52	int result = 0;
	53	struct acpi_bus_event event;
	54	static char str[ACPI_MAX_STRING];
	55	static int chars_remaining = 0;
	56	static char *ptr;
1da177e4	57
1da177e4 LT	58	if (!chars_remaining) {
	59	memset(&event, 0, sizeof(struct acpi_bus_event));
	60
	61	if ((file->f_flags & O_NONBLOCK)
	62	&& (list_empty(&acpi_bus_event_list)))
d550d98d	63	return -EAGAIN;
1da177e4 LT	64
1da177e4 LT	65	result = acpi_bus_receive_event(&event);
5cc9eeef	66	if (result)
d550d98d	67	return result;
1da177e4	68
4be44fcd LB	69	chars_remaining = sprintf(str, "%s %s %08x %08x\n",
	70	event.device_class ? event.
	71	device_class : "<unknown>",
	72	event.bus_id ? event.
	73	bus_id : "<unknown>", event.type,
	74	event.data);
1da177e4 LT	75	ptr = str;
	76	}
	77
	78	if (chars_remaining < count) {
	79	count = chars_remaining;
	80	}
	81
	82	if (copy_to_user(buffer, ptr, count))
d550d98d	83	return -EFAULT;
1da177e4 LT	84
	85	*ppos += count;
	86	chars_remaining -= count;
	87	ptr += count;
	88
d550d98d	89	return count;
1da177e4 LT	90	}
1da177e4 LT	91
4be44fcd	92	static int acpi_system_close_event(struct inode inode, struct file file)
1da177e4	93	{
4be44fcd	94	spin_lock_irq(&acpi_system_event_lock);
1da177e4	95	event_is_open = 0;
4be44fcd	96	spin_unlock_irq(&acpi_system_event_lock);
1da177e4 LT	97	return 0;
	98	}
	99
4be44fcd	100	static unsigned int acpi_system_poll_event(struct file file, poll_table wait)
1da177e4 LT	101	{
	102	poll_wait(file, &acpi_bus_event_queue, wait);
	103	if (!list_empty(&acpi_bus_event_list))
	104	return POLLIN \| POLLRDNORM;
	105	return 0;
	106	}
	107
d7508032	108	static const struct file_operations acpi_system_event_ops = {
cf7acfab	109	.owner = THIS_MODULE,
4be44fcd LB	110	.open = acpi_system_open_event,
	111	.read = acpi_system_read_event,
	112	.release = acpi_system_close_event,
	113	.poll = acpi_system_poll_event,
6038f373	114	.llseek = default_llseek,
1da177e4	115	};
14e04fb3	116	#endif /* CONFIG_ACPI_PROC_EVENT */
1da177e4	117
9ee85241	118	/* ACPI notifier chain */
c8e773fa	119	static BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
9ee85241 ZR	120
	121	int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data)
	122	{
	123	struct acpi_bus_event event;
	124
	125	strcpy(event.device_class, dev->pnp.device_class);
	126	strcpy(event.bus_id, dev->pnp.bus_id);
	127	event.type = type;
	128	event.data = data;
	129	return (blocking_notifier_call_chain(&acpi_chain_head, 0, (void *)&event)
	130	== NOTIFY_BAD) ? -EINVAL : 0;
	131	}
	132	EXPORT_SYMBOL(acpi_notifier_call_chain);
	133
	134	int register_acpi_notifier(struct notifier_block *nb)
	135	{
	136	return blocking_notifier_chain_register(&acpi_chain_head, nb);
	137	}
	138	EXPORT_SYMBOL(register_acpi_notifier);
	139
	140	int unregister_acpi_notifier(struct notifier_block *nb)
	141	{
	142	return blocking_notifier_chain_unregister(&acpi_chain_head, nb);
	143	}
	144	EXPORT_SYMBOL(unregister_acpi_notifier);
	145
864bdfb9	146	#ifdef CONFIG_NET
e13d8747	147	static unsigned int acpi_event_seqnum;
864bdfb9 ZR	148	struct acpi_genl_event {
	149	acpi_device_class device_class;
	150	char bus_id[15];
	151	u32 type;
	152	u32 data;
	153	};
	154
	155	/* attributes of acpi_genl_family */
	156	enum {
	157	ACPI_GENL_ATTR_UNSPEC,
	158	ACPI_GENL_ATTR_EVENT, /* ACPI event info needed by user space */
	159	__ACPI_GENL_ATTR_MAX,
	160	};
	161	#define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1)
	162
	163	/* commands supported by the acpi_genl_family */
	164	enum {
	165	ACPI_GENL_CMD_UNSPEC,
	166	ACPI_GENL_CMD_EVENT, /* kernel->user notifications for ACPI events */
	167	__ACPI_GENL_CMD_MAX,
	168	};
	169	#define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1)
	170
9c977a45 ZR	171	#define ACPI_GENL_FAMILY_NAME "acpi_event"
	172	#define ACPI_GENL_VERSION 0x01
	173	#define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group"
864bdfb9 ZR	174
	175	static struct genl_family acpi_event_genl_family = {
	176	.id = GENL_ID_GENERATE,
9c977a45	177	.name = ACPI_GENL_FAMILY_NAME,
864bdfb9 ZR	178	.version = ACPI_GENL_VERSION,
	179	.maxattr = ACPI_GENL_ATTR_MAX,
	180	};
	181
9c977a45 ZR	182	static struct genl_multicast_group acpi_event_mcgrp = {
9c977a45 ZR	183	.name = ACPI_GENL_MCAST_GROUP_NAME,
864bdfb9 ZR	184	};
864bdfb9 ZR	185
962ce8ca ZR	186	int acpi_bus_generate_netlink_event(const char *device_class,
962ce8ca ZR	187	const char *bus_id,
864bdfb9 ZR	188	u8 type, int data)
	189	{
	190	struct sk_buff *skb;
	191	struct nlattr *attr;
	192	struct acpi_genl_event *event;
	193	void *msg_header;
	194	int size;
	195	int result;
	196
	197	/* allocate memory */
	198	size = nla_total_size(sizeof(struct acpi_genl_event)) +
	199	nla_total_size(0);
	200
	201	skb = genlmsg_new(size, GFP_ATOMIC);
	202	if (!skb)
	203	return -ENOMEM;
	204
	205	/* add the genetlink message header */
	206	msg_header = genlmsg_put(skb, 0, acpi_event_seqnum++,
	207	&acpi_event_genl_family, 0,
	208	ACPI_GENL_CMD_EVENT);
	209	if (!msg_header) {
	210	nlmsg_free(skb);
	211	return -ENOMEM;
	212	}
	213
	214	/* fill the data */
	215	attr =
	216	nla_reserve(skb, ACPI_GENL_ATTR_EVENT,
	217	sizeof(struct acpi_genl_event));
	218	if (!attr) {
	219	nlmsg_free(skb);
	220	return -EINVAL;
	221	}
	222
	223	event = nla_data(attr);
	224	if (!event) {
	225	nlmsg_free(skb);
	226	return -EINVAL;
	227	}
	228
	229	memset(event, 0, sizeof(struct acpi_genl_event));
	230
962ce8ca ZR	231	strcpy(event->device_class, device_class);
962ce8ca ZR	232	strcpy(event->bus_id, bus_id);
864bdfb9 ZR	233	event->type = type;
	234	event->data = data;
	235
	236	/* send multicast genetlink message */
	237	result = genlmsg_end(skb, msg_header);
	238	if (result < 0) {
	239	nlmsg_free(skb);
	240	return result;
	241	}
	242
ff491a73	243	genlmsg_multicast(skb, 0, acpi_event_mcgrp.id, GFP_ATOMIC);
864bdfb9 ZR	244	return 0;
864bdfb9 ZR	245	}
864bdfb9	246
962ce8ca ZR	247	EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
962ce8ca ZR	248
864bdfb9 ZR	249	static int acpi_event_genetlink_init(void)
	250	{
	251	int result;
	252
	253	result = genl_register_family(&acpi_event_genl_family);
	254	if (result)
	255	return result;
	256
9c977a45 ZR	257	result = genl_register_mc_group(&acpi_event_genl_family,
9c977a45 ZR	258	&acpi_event_mcgrp);
864bdfb9 ZR	259	if (result)
	260	genl_unregister_family(&acpi_event_genl_family);
	261
	262	return result;
	263	}
	264
	265	#else
3e069ee0 LB	266	int acpi_bus_generate_netlink_event(const char *device_class,
	267	const char *bus_id,
	268	u8 type, int data)
864bdfb9 ZR	269	{
	270	return 0;
	271	}
864bdfb9	272
66baf327	273	EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
962ce8ca	274
864bdfb9 ZR	275	static int acpi_event_genetlink_init(void)
	276	{
	277	return -ENODEV;
	278	}
	279	#endif
	280
1da177e4 LT	281	static int __init acpi_event_init(void)
1da177e4 LT	282	{
14e04fb3	283	#ifdef CONFIG_ACPI_PROC_EVENT
4be44fcd	284	struct proc_dir_entry *entry;
14e04fb3	285	#endif
1da177e4 LT	286	int error = 0;
1da177e4 LT	287
1da177e4	288	if (acpi_disabled)
d550d98d	289	return 0;
1da177e4	290
864bdfb9 ZR	291	/* create genetlink for acpi event */
	292	error = acpi_event_genetlink_init();
	293	if (error)
	294	printk(KERN_WARNING PREFIX
	295	"Failed to create genetlink family for ACPI event\n");
	296
14e04fb3	297	#ifdef CONFIG_ACPI_PROC_EVENT
1da177e4	298	/* 'event' [R] */
cf7acfab DL	299	entry = proc_create("event", S_IRUSR, acpi_root_dir,
	300	&acpi_system_event_ops);
	301	if (!entry)
864bdfb9	302	return -ENODEV;
14e04fb3	303	#endif
864bdfb9 ZR	304
864bdfb9 ZR	305	return 0;
1da177e4 LT	306	}
1da177e4 LT	307
864bdfb9	308	fs_initcall(acpi_event_init);