[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>

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