[GitHub/mt8127/android_kernel_alcatel_ttab.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");

/* 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,
};

#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(struct acpi_device *device, u8 type,
				      int data)
{
	return 0;
}

EXPORT_SYMBOL(acpi_generate_netlink_event);

static int acpi_event_genetlink_init(void)
{
	return -ENODEV;
}
#endif

static int __init acpi_event_init(void)
{
	struct proc_dir_entry *entry;
	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");

	/* 'event' [R] */
	entry = create_proc_entry("event", S_IRUSR, acpi_root_dir);
	if (entry)
		entry->proc_fops = &acpi_system_event_ops;
	else
		return -ENODEV;

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