drivers/acpi/event.c - kernel/msm-4.19 - Gitiles

 /*
  * 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);
	/*
	* 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);