[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/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>
	10	#include <linux/proc_fs.h>
	11	#include <linux/init.h>
	12	#include <linux/poll.h>
5a0e3ad6	13	#include <linux/gfp.h>
1da177e4	14	#include <acpi/acpi_drivers.h>
864bdfb9 ZR	15	#include <net/netlink.h>
864bdfb9 ZR	16	#include <net/genetlink.h>
1da177e4	17
a192a958 LB	18	#include "internal.h"
a192a958 LB	19
1da177e4	20	#define _COMPONENT ACPI_SYSTEM_COMPONENT
f52fd66d	21	ACPI_MODULE_NAME("event");
1da177e4	22
14e04fb3	23	#ifdef CONFIG_ACPI_PROC_EVENT
1da177e4 LT	24	/* Global vars for handling event proc entry */
1da177e4 LT	25	static DEFINE_SPINLOCK(acpi_system_event_lock);
4be44fcd LB	26	int event_is_open = 0;
	27	extern struct list_head acpi_bus_event_list;
	28	extern wait_queue_head_t acpi_bus_event_queue;
1da177e4	29
4be44fcd	30	static int acpi_system_open_event(struct inode inode, struct file file)
1da177e4	31	{
c65ade4d	32	spin_lock_irq(&acpi_system_event_lock);
1da177e4	33
c65ade4d	34	if (event_is_open)
1da177e4 LT	35	goto out_busy;
	36
	37	event_is_open = 1;
	38
c65ade4d	39	spin_unlock_irq(&acpi_system_event_lock);
1da177e4 LT	40	return 0;
1da177e4 LT	41
4be44fcd	42	out_busy:
c65ade4d	43	spin_unlock_irq(&acpi_system_event_lock);
1da177e4 LT	44	return -EBUSY;
	45	}
	46
	47	static ssize_t
4be44fcd LB	48	acpi_system_read_event(struct file file, char __user buffer, size_t count,
4be44fcd LB	49	loff_t * ppos)
1da177e4	50	{
4be44fcd LB	51	int result = 0;
	52	struct acpi_bus_event event;
	53	static char str[ACPI_MAX_STRING];
	54	static int chars_remaining = 0;
	55	static char *ptr;
1da177e4	56
1da177e4 LT	57	if (!chars_remaining) {
	58	memset(&event, 0, sizeof(struct acpi_bus_event));
	59
	60	if ((file->f_flags & O_NONBLOCK)
	61	&& (list_empty(&acpi_bus_event_list)))
d550d98d	62	return -EAGAIN;
1da177e4 LT	63
1da177e4 LT	64	result = acpi_bus_receive_event(&event);
5cc9eeef	65	if (result)
d550d98d	66	return result;
1da177e4	67
4be44fcd LB	68	chars_remaining = sprintf(str, "%s %s %08x %08x\n",
	69	event.device_class ? event.
	70	device_class : "<unknown>",
	71	event.bus_id ? event.
	72	bus_id : "<unknown>", event.type,
	73	event.data);
1da177e4 LT	74	ptr = str;
	75	}
	76
	77	if (chars_remaining < count) {
	78	count = chars_remaining;
	79	}
	80
	81	if (copy_to_user(buffer, ptr, count))
d550d98d	82	return -EFAULT;
1da177e4 LT	83
	84	*ppos += count;
	85	chars_remaining -= count;
	86	ptr += count;
	87
d550d98d	88	return count;
1da177e4 LT	89	}
1da177e4 LT	90
4be44fcd	91	static int acpi_system_close_event(struct inode inode, struct file file)
1da177e4	92	{
4be44fcd	93	spin_lock_irq(&acpi_system_event_lock);
1da177e4	94	event_is_open = 0;
4be44fcd	95	spin_unlock_irq(&acpi_system_event_lock);
1da177e4 LT	96	return 0;
	97	}
	98
4be44fcd	99	static unsigned int acpi_system_poll_event(struct file file, poll_table wait)
1da177e4 LT	100	{
	101	poll_wait(file, &acpi_bus_event_queue, wait);
	102	if (!list_empty(&acpi_bus_event_list))
	103	return POLLIN \| POLLRDNORM;
	104	return 0;
	105	}
	106
d7508032	107	static const struct file_operations acpi_system_event_ops = {
cf7acfab	108	.owner = THIS_MODULE,
4be44fcd LB	109	.open = acpi_system_open_event,
	110	.read = acpi_system_read_event,
	111	.release = acpi_system_close_event,
	112	.poll = acpi_system_poll_event,
6038f373	113	.llseek = default_llseek,
1da177e4	114	};
14e04fb3	115	#endif /* CONFIG_ACPI_PROC_EVENT */
1da177e4	116
9ee85241	117	/* ACPI notifier chain */
c8e773fa	118	static BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
9ee85241 ZR	119
	120	int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data)
	121	{
	122	struct acpi_bus_event event;
	123
	124	strcpy(event.device_class, dev->pnp.device_class);
	125	strcpy(event.bus_id, dev->pnp.bus_id);
	126	event.type = type;
	127	event.data = data;
	128	return (blocking_notifier_call_chain(&acpi_chain_head, 0, (void *)&event)
	129	== NOTIFY_BAD) ? -EINVAL : 0;
	130	}
	131	EXPORT_SYMBOL(acpi_notifier_call_chain);
	132
	133	int register_acpi_notifier(struct notifier_block *nb)
	134	{
	135	return blocking_notifier_chain_register(&acpi_chain_head, nb);
	136	}
	137	EXPORT_SYMBOL(register_acpi_notifier);
	138
	139	int unregister_acpi_notifier(struct notifier_block *nb)
	140	{
	141	return blocking_notifier_chain_unregister(&acpi_chain_head, nb);
	142	}
	143	EXPORT_SYMBOL(unregister_acpi_notifier);
	144
864bdfb9	145	#ifdef CONFIG_NET
e13d8747	146	static unsigned int acpi_event_seqnum;
864bdfb9 ZR	147	struct acpi_genl_event {
	148	acpi_device_class device_class;
	149	char bus_id[15];
	150	u32 type;
	151	u32 data;
	152	};
	153
	154	/* attributes of acpi_genl_family */
	155	enum {
	156	ACPI_GENL_ATTR_UNSPEC,
	157	ACPI_GENL_ATTR_EVENT, /* ACPI event info needed by user space */
	158	__ACPI_GENL_ATTR_MAX,
	159	};
	160	#define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1)
	161
	162	/* commands supported by the acpi_genl_family */
	163	enum {
	164	ACPI_GENL_CMD_UNSPEC,
	165	ACPI_GENL_CMD_EVENT, /* kernel->user notifications for ACPI events */
	166	__ACPI_GENL_CMD_MAX,
	167	};
	168	#define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1)
	169
9c977a45 ZR	170	#define ACPI_GENL_FAMILY_NAME "acpi_event"
	171	#define ACPI_GENL_VERSION 0x01
	172	#define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group"
864bdfb9 ZR	173
	174	static struct genl_family acpi_event_genl_family = {
	175	.id = GENL_ID_GENERATE,
9c977a45	176	.name = ACPI_GENL_FAMILY_NAME,
864bdfb9 ZR	177	.version = ACPI_GENL_VERSION,
	178	.maxattr = ACPI_GENL_ATTR_MAX,
	179	};
	180
9c977a45 ZR	181	static struct genl_multicast_group acpi_event_mcgrp = {
9c977a45 ZR	182	.name = ACPI_GENL_MCAST_GROUP_NAME,
864bdfb9 ZR	183	};
864bdfb9 ZR	184
962ce8ca ZR	185	int acpi_bus_generate_netlink_event(const char *device_class,
962ce8ca ZR	186	const char *bus_id,
864bdfb9 ZR	187	u8 type, int data)
	188	{
	189	struct sk_buff *skb;
	190	struct nlattr *attr;
	191	struct acpi_genl_event *event;
	192	void *msg_header;
	193	int size;
	194	int result;
	195
	196	/* allocate memory */
	197	size = nla_total_size(sizeof(struct acpi_genl_event)) +
	198	nla_total_size(0);
	199
	200	skb = genlmsg_new(size, GFP_ATOMIC);
	201	if (!skb)
	202	return -ENOMEM;
	203
	204	/* add the genetlink message header */
	205	msg_header = genlmsg_put(skb, 0, acpi_event_seqnum++,
	206	&acpi_event_genl_family, 0,
	207	ACPI_GENL_CMD_EVENT);
	208	if (!msg_header) {
	209	nlmsg_free(skb);
	210	return -ENOMEM;
	211	}
	212
	213	/* fill the data */
	214	attr =
	215	nla_reserve(skb, ACPI_GENL_ATTR_EVENT,
	216	sizeof(struct acpi_genl_event));
	217	if (!attr) {
	218	nlmsg_free(skb);
	219	return -EINVAL;
	220	}
	221
	222	event = nla_data(attr);
	223	if (!event) {
	224	nlmsg_free(skb);
	225	return -EINVAL;
	226	}
	227
	228	memset(event, 0, sizeof(struct acpi_genl_event));
	229
962ce8ca ZR	230	strcpy(event->device_class, device_class);
962ce8ca ZR	231	strcpy(event->bus_id, bus_id);
864bdfb9 ZR	232	event->type = type;
	233	event->data = data;
	234
	235	/* send multicast genetlink message */
	236	result = genlmsg_end(skb, msg_header);
	237	if (result < 0) {
	238	nlmsg_free(skb);
	239	return result;
	240	}
	241
ff491a73	242	genlmsg_multicast(skb, 0, acpi_event_mcgrp.id, GFP_ATOMIC);
864bdfb9 ZR	243	return 0;
864bdfb9 ZR	244	}
864bdfb9	245
962ce8ca ZR	246	EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
962ce8ca ZR	247
864bdfb9 ZR	248	static int acpi_event_genetlink_init(void)
	249	{
	250	int result;
	251
	252	result = genl_register_family(&acpi_event_genl_family);
	253	if (result)
	254	return result;
	255
9c977a45 ZR	256	result = genl_register_mc_group(&acpi_event_genl_family,
9c977a45 ZR	257	&acpi_event_mcgrp);
864bdfb9 ZR	258	if (result)
	259	genl_unregister_family(&acpi_event_genl_family);
	260
	261	return result;
	262	}
	263
	264	#else
3e069ee0 LB	265	int acpi_bus_generate_netlink_event(const char *device_class,
	266	const char *bus_id,
	267	u8 type, int data)
864bdfb9 ZR	268	{
	269	return 0;
	270	}
864bdfb9	271
66baf327	272	EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
962ce8ca	273
864bdfb9 ZR	274	static int acpi_event_genetlink_init(void)
	275	{
	276	return -ENODEV;
	277	}
	278	#endif
	279
1da177e4 LT	280	static int __init acpi_event_init(void)
1da177e4 LT	281	{
14e04fb3	282	#ifdef CONFIG_ACPI_PROC_EVENT
4be44fcd	283	struct proc_dir_entry *entry;
14e04fb3	284	#endif
1da177e4 LT	285	int error = 0;
1da177e4 LT	286
1da177e4	287	if (acpi_disabled)
d550d98d	288	return 0;
1da177e4	289
864bdfb9 ZR	290	/* create genetlink for acpi event */
	291	error = acpi_event_genetlink_init();
	292	if (error)
	293	printk(KERN_WARNING PREFIX
	294	"Failed to create genetlink family for ACPI event\n");
	295
14e04fb3	296	#ifdef CONFIG_ACPI_PROC_EVENT
1da177e4	297	/* 'event' [R] */
cf7acfab DL	298	entry = proc_create("event", S_IRUSR, acpi_root_dir,
	299	&acpi_system_event_ops);
	300	if (!entry)
864bdfb9	301	return -ENODEV;
14e04fb3	302	#endif
864bdfb9 ZR	303
864bdfb9 ZR	304	return 0;
1da177e4 LT	305	}
1da177e4 LT	306
864bdfb9	307	fs_initcall(acpi_event_init);