[deliverable/linux.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/proc_fs.h>
#include <linux/init.h>
#include <linux/poll.h>
#include <acpi/acpi_drivers.h>
#include <net/netlink.h>
#include <net/genetlink.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 = {
	.open = acpi_system_open_event,
	.read = acpi_system_read_event,
	.release = acpi_system_close_event,
	.poll = acpi_system_poll_event,
};
#endif	/* CONFIG_ACPI_PROC_EVENT */

/* ACPI notifier chain */
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;
	}

	result =
	    genlmsg_multicast(skb, 0, acpi_event_mcgrp.id, GFP_ATOMIC);
	if (result)
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "Failed to send a Genetlink message!\n"));
	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 = create_proc_entry("event", S_IRUSR, acpi_root_dir);
	if (entry)
		entry->proc_fops = &acpi_system_event_ops;
	else
		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 <andrew.grover@intel.com>
	5	* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
	6	*
	7	*/
	8
	9	#include <linux/spinlock.h>
	10	#include <linux/proc_fs.h>
	11	#include <linux/init.h>
	12	#include <linux/poll.h>
	13	#include <acpi/acpi_drivers.h>
864bdfb9 ZR	14	#include <net/netlink.h>
864bdfb9 ZR	15	#include <net/genetlink.h>
1da177e4 LT	16
1da177e4 LT	17	#define _COMPONENT ACPI_SYSTEM_COMPONENT
f52fd66d	18	ACPI_MODULE_NAME("event");
1da177e4	19
14e04fb3	20	#ifdef CONFIG_ACPI_PROC_EVENT
1da177e4 LT	21	/* Global vars for handling event proc entry */
1da177e4 LT	22	static DEFINE_SPINLOCK(acpi_system_event_lock);
4be44fcd LB	23	int event_is_open = 0;
	24	extern struct list_head acpi_bus_event_list;
	25	extern wait_queue_head_t acpi_bus_event_queue;
1da177e4	26
4be44fcd	27	static int acpi_system_open_event(struct inode inode, struct file file)
1da177e4	28	{
c65ade4d	29	spin_lock_irq(&acpi_system_event_lock);
1da177e4	30
c65ade4d	31	if (event_is_open)
1da177e4 LT	32	goto out_busy;
	33
	34	event_is_open = 1;
	35
c65ade4d	36	spin_unlock_irq(&acpi_system_event_lock);
1da177e4 LT	37	return 0;
1da177e4 LT	38
4be44fcd	39	out_busy:
c65ade4d	40	spin_unlock_irq(&acpi_system_event_lock);
1da177e4 LT	41	return -EBUSY;
	42	}
	43
	44	static ssize_t
4be44fcd LB	45	acpi_system_read_event(struct file file, char __user buffer, size_t count,
4be44fcd LB	46	loff_t * ppos)
1da177e4	47	{
4be44fcd LB	48	int result = 0;
	49	struct acpi_bus_event event;
	50	static char str[ACPI_MAX_STRING];
	51	static int chars_remaining = 0;
	52	static char *ptr;
1da177e4	53
1da177e4 LT	54	if (!chars_remaining) {
	55	memset(&event, 0, sizeof(struct acpi_bus_event));
	56
	57	if ((file->f_flags & O_NONBLOCK)
	58	&& (list_empty(&acpi_bus_event_list)))
d550d98d	59	return -EAGAIN;
1da177e4 LT	60
1da177e4 LT	61	result = acpi_bus_receive_event(&event);
5cc9eeef	62	if (result)
d550d98d	63	return result;
1da177e4	64
4be44fcd LB	65	chars_remaining = sprintf(str, "%s %s %08x %08x\n",
	66	event.device_class ? event.
	67	device_class : "<unknown>",
	68	event.bus_id ? event.
	69	bus_id : "<unknown>", event.type,
	70	event.data);
1da177e4 LT	71	ptr = str;
	72	}
	73
	74	if (chars_remaining < count) {
	75	count = chars_remaining;
	76	}
	77
	78	if (copy_to_user(buffer, ptr, count))
d550d98d	79	return -EFAULT;
1da177e4 LT	80
	81	*ppos += count;
	82	chars_remaining -= count;
	83	ptr += count;
	84
d550d98d	85	return count;
1da177e4 LT	86	}
1da177e4 LT	87
4be44fcd	88	static int acpi_system_close_event(struct inode inode, struct file file)
1da177e4	89	{
4be44fcd	90	spin_lock_irq(&acpi_system_event_lock);
1da177e4	91	event_is_open = 0;
4be44fcd	92	spin_unlock_irq(&acpi_system_event_lock);
1da177e4 LT	93	return 0;
	94	}
	95
4be44fcd	96	static unsigned int acpi_system_poll_event(struct file file, poll_table wait)
1da177e4 LT	97	{
	98	poll_wait(file, &acpi_bus_event_queue, wait);
	99	if (!list_empty(&acpi_bus_event_list))
	100	return POLLIN \| POLLRDNORM;
	101	return 0;
	102	}
	103
d7508032	104	static const struct file_operations acpi_system_event_ops = {
4be44fcd LB	105	.open = acpi_system_open_event,
	106	.read = acpi_system_read_event,
	107	.release = acpi_system_close_event,
	108	.poll = acpi_system_poll_event,
1da177e4	109	};
14e04fb3	110	#endif /* CONFIG_ACPI_PROC_EVENT */
1da177e4	111
9ee85241 ZR	112	/* ACPI notifier chain */
	113	BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
	114
	115	int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data)
	116	{
	117	struct acpi_bus_event event;
	118
	119	strcpy(event.device_class, dev->pnp.device_class);
	120	strcpy(event.bus_id, dev->pnp.bus_id);
	121	event.type = type;
	122	event.data = data;
	123	return (blocking_notifier_call_chain(&acpi_chain_head, 0, (void *)&event)
	124	== NOTIFY_BAD) ? -EINVAL : 0;
	125	}
	126	EXPORT_SYMBOL(acpi_notifier_call_chain);
	127
	128	int register_acpi_notifier(struct notifier_block *nb)
	129	{
	130	return blocking_notifier_chain_register(&acpi_chain_head, nb);
	131	}
	132	EXPORT_SYMBOL(register_acpi_notifier);
	133
	134	int unregister_acpi_notifier(struct notifier_block *nb)
	135	{
	136	return blocking_notifier_chain_unregister(&acpi_chain_head, nb);
	137	}
	138	EXPORT_SYMBOL(unregister_acpi_notifier);
	139
864bdfb9	140	#ifdef CONFIG_NET
e13d8747	141	static unsigned int acpi_event_seqnum;
864bdfb9 ZR	142	struct acpi_genl_event {
	143	acpi_device_class device_class;
	144	char bus_id[15];
	145	u32 type;
	146	u32 data;
	147	};
	148
	149	/* attributes of acpi_genl_family */
	150	enum {
	151	ACPI_GENL_ATTR_UNSPEC,
	152	ACPI_GENL_ATTR_EVENT, /* ACPI event info needed by user space */
	153	__ACPI_GENL_ATTR_MAX,
	154	};
	155	#define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1)
	156
	157	/* commands supported by the acpi_genl_family */
	158	enum {
	159	ACPI_GENL_CMD_UNSPEC,
	160	ACPI_GENL_CMD_EVENT, /* kernel->user notifications for ACPI events */
	161	__ACPI_GENL_CMD_MAX,
	162	};
	163	#define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1)
	164
9c977a45 ZR	165	#define ACPI_GENL_FAMILY_NAME "acpi_event"
	166	#define ACPI_GENL_VERSION 0x01
	167	#define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group"
864bdfb9 ZR	168
	169	static struct genl_family acpi_event_genl_family = {
	170	.id = GENL_ID_GENERATE,
9c977a45	171	.name = ACPI_GENL_FAMILY_NAME,
864bdfb9 ZR	172	.version = ACPI_GENL_VERSION,
	173	.maxattr = ACPI_GENL_ATTR_MAX,
	174	};
	175
9c977a45 ZR	176	static struct genl_multicast_group acpi_event_mcgrp = {
9c977a45 ZR	177	.name = ACPI_GENL_MCAST_GROUP_NAME,
864bdfb9 ZR	178	};
864bdfb9 ZR	179
962ce8ca ZR	180	int acpi_bus_generate_netlink_event(const char *device_class,
962ce8ca ZR	181	const char *bus_id,
864bdfb9 ZR	182	u8 type, int data)
	183	{
	184	struct sk_buff *skb;
	185	struct nlattr *attr;
	186	struct acpi_genl_event *event;
	187	void *msg_header;
	188	int size;
	189	int result;
	190
	191	/* allocate memory */
	192	size = nla_total_size(sizeof(struct acpi_genl_event)) +
	193	nla_total_size(0);
	194
	195	skb = genlmsg_new(size, GFP_ATOMIC);
	196	if (!skb)
	197	return -ENOMEM;
	198
	199	/* add the genetlink message header */
	200	msg_header = genlmsg_put(skb, 0, acpi_event_seqnum++,
	201	&acpi_event_genl_family, 0,
	202	ACPI_GENL_CMD_EVENT);
	203	if (!msg_header) {
	204	nlmsg_free(skb);
	205	return -ENOMEM;
	206	}
	207
	208	/* fill the data */
	209	attr =
	210	nla_reserve(skb, ACPI_GENL_ATTR_EVENT,
	211	sizeof(struct acpi_genl_event));
	212	if (!attr) {
	213	nlmsg_free(skb);
	214	return -EINVAL;
	215	}
	216
	217	event = nla_data(attr);
	218	if (!event) {
	219	nlmsg_free(skb);
	220	return -EINVAL;
	221	}
	222
	223	memset(event, 0, sizeof(struct acpi_genl_event));
	224
962ce8ca ZR	225	strcpy(event->device_class, device_class);
962ce8ca ZR	226	strcpy(event->bus_id, bus_id);
864bdfb9 ZR	227	event->type = type;
	228	event->data = data;
	229
	230	/* send multicast genetlink message */
	231	result = genlmsg_end(skb, msg_header);
	232	if (result < 0) {
	233	nlmsg_free(skb);
	234	return result;
	235	}
	236
	237	result =
9c977a45	238	genlmsg_multicast(skb, 0, acpi_event_mcgrp.id, GFP_ATOMIC);
864bdfb9 ZR	239	if (result)
	240	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	241	"Failed to send a Genetlink message!\n"));
	242	return 0;
	243	}
864bdfb9	244
962ce8ca ZR	245	EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
962ce8ca ZR	246
864bdfb9 ZR	247	static int acpi_event_genetlink_init(void)
	248	{
	249	int result;
	250
	251	result = genl_register_family(&acpi_event_genl_family);
	252	if (result)
	253	return result;
	254
9c977a45 ZR	255	result = genl_register_mc_group(&acpi_event_genl_family,
9c977a45 ZR	256	&acpi_event_mcgrp);
864bdfb9 ZR	257	if (result)
	258	genl_unregister_family(&acpi_event_genl_family);
	259
	260	return result;
	261	}
	262
	263	#else
3e069ee0 LB	264	int acpi_bus_generate_netlink_event(const char *device_class,
	265	const char *bus_id,
	266	u8 type, int data)
864bdfb9 ZR	267	{
	268	return 0;
	269	}
864bdfb9	270
66baf327	271	EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
962ce8ca	272
864bdfb9 ZR	273	static int acpi_event_genetlink_init(void)
	274	{
	275	return -ENODEV;
	276	}
	277	#endif
	278
1da177e4 LT	279	static int __init acpi_event_init(void)
1da177e4 LT	280	{
14e04fb3	281	#ifdef CONFIG_ACPI_PROC_EVENT
4be44fcd	282	struct proc_dir_entry *entry;
14e04fb3	283	#endif
1da177e4 LT	284	int error = 0;
1da177e4 LT	285
1da177e4	286	if (acpi_disabled)
d550d98d	287	return 0;
1da177e4	288
864bdfb9 ZR	289	/* create genetlink for acpi event */
	290	error = acpi_event_genetlink_init();
	291	if (error)
	292	printk(KERN_WARNING PREFIX
	293	"Failed to create genetlink family for ACPI event\n");
	294
14e04fb3	295	#ifdef CONFIG_ACPI_PROC_EVENT
1da177e4 LT	296	/* 'event' [R] */
	297	entry = create_proc_entry("event", S_IRUSR, acpi_root_dir);
	298	if (entry)
	299	entry->proc_fops = &acpi_system_event_ops;
864bdfb9 ZR	300	else
864bdfb9 ZR	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);