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v3.1
 
  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 <linux/gfp.h>
 14#include <acpi/acpi_drivers.h>
 15#include <net/netlink.h>
 16#include <net/genetlink.h>
 17
 18#include "internal.h"
 19
 20#define _COMPONENT		ACPI_SYSTEM_COMPONENT
 21ACPI_MODULE_NAME("event");
 22
 23#ifdef CONFIG_ACPI_PROC_EVENT
 24/* Global vars for handling event proc entry */
 25static DEFINE_SPINLOCK(acpi_system_event_lock);
 26int event_is_open = 0;
 27extern struct list_head acpi_bus_event_list;
 28extern wait_queue_head_t acpi_bus_event_queue;
 29
 30static int acpi_system_open_event(struct inode *inode, struct file *file)
 31{
 32	spin_lock_irq(&acpi_system_event_lock);
 33
 34	if (event_is_open)
 35		goto out_busy;
 36
 37	event_is_open = 1;
 38
 39	spin_unlock_irq(&acpi_system_event_lock);
 40	return 0;
 41
 42      out_busy:
 43	spin_unlock_irq(&acpi_system_event_lock);
 44	return -EBUSY;
 45}
 46
 47static ssize_t
 48acpi_system_read_event(struct file *file, char __user * buffer, size_t count,
 49		       loff_t * ppos)
 50{
 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;
 56
 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)))
 62			return -EAGAIN;
 63
 64		result = acpi_bus_receive_event(&event);
 65		if (result)
 66			return result;
 67
 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);
 74		ptr = str;
 75	}
 76
 77	if (chars_remaining < count) {
 78		count = chars_remaining;
 79	}
 80
 81	if (copy_to_user(buffer, ptr, count))
 82		return -EFAULT;
 83
 84	*ppos += count;
 85	chars_remaining -= count;
 86	ptr += count;
 87
 88	return count;
 89}
 90
 91static int acpi_system_close_event(struct inode *inode, struct file *file)
 92{
 93	spin_lock_irq(&acpi_system_event_lock);
 94	event_is_open = 0;
 95	spin_unlock_irq(&acpi_system_event_lock);
 96	return 0;
 97}
 98
 99static unsigned int acpi_system_poll_event(struct file *file, poll_table * wait)
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
107static const struct file_operations acpi_system_event_ops = {
108	.owner = THIS_MODULE,
109	.open = acpi_system_open_event,
110	.read = acpi_system_read_event,
111	.release = acpi_system_close_event,
112	.poll = acpi_system_poll_event,
113	.llseek = default_llseek,
114};
115#endif	/* CONFIG_ACPI_PROC_EVENT */
116
117/* ACPI notifier chain */
118static BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
119
120int 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}
131EXPORT_SYMBOL(acpi_notifier_call_chain);
132
133int register_acpi_notifier(struct notifier_block *nb)
134{
135	return blocking_notifier_chain_register(&acpi_chain_head, nb);
136}
137EXPORT_SYMBOL(register_acpi_notifier);
138
139int unregister_acpi_notifier(struct notifier_block *nb)
140{
141	return blocking_notifier_chain_unregister(&acpi_chain_head, nb);
142}
143EXPORT_SYMBOL(unregister_acpi_notifier);
144
145#ifdef CONFIG_NET
146static unsigned int acpi_event_seqnum;
147struct 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 */
155enum {
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 */
163enum {
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
170#define ACPI_GENL_FAMILY_NAME		"acpi_event"
171#define ACPI_GENL_VERSION		0x01
172#define ACPI_GENL_MCAST_GROUP_NAME 	"acpi_mc_group"
173
174static struct genl_family acpi_event_genl_family = {
175	.id = GENL_ID_GENERATE,
 
 
 
 
176	.name = ACPI_GENL_FAMILY_NAME,
177	.version = ACPI_GENL_VERSION,
178	.maxattr = ACPI_GENL_ATTR_MAX,
179};
180
181static struct genl_multicast_group acpi_event_mcgrp = {
182	.name = ACPI_GENL_MCAST_GROUP_NAME,
183};
184
185int acpi_bus_generate_netlink_event(const char *device_class,
186				      const char *bus_id,
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
230	strcpy(event->device_class, device_class);
231	strcpy(event->bus_id, bus_id);
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
242	genlmsg_multicast(skb, 0, acpi_event_mcgrp.id, GFP_ATOMIC);
243	return 0;
244}
245
246EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
247
248static 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
256	result = genl_register_mc_group(&acpi_event_genl_family,
257					&acpi_event_mcgrp);
258	if (result)
259		genl_unregister_family(&acpi_event_genl_family);
260
261	return result;
262}
263
264#else
265int acpi_bus_generate_netlink_event(const char *device_class,
266				      const char *bus_id,
267				      u8 type, int data)
268{
269	return 0;
270}
271
272EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
273
274static int acpi_event_genetlink_init(void)
275{
276	return -ENODEV;
277}
278#endif
279
280static int __init acpi_event_init(void)
281{
282#ifdef CONFIG_ACPI_PROC_EVENT
283	struct proc_dir_entry *entry;
284#endif
285	int error = 0;
286
287	if (acpi_disabled)
288		return 0;
289
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
296#ifdef CONFIG_ACPI_PROC_EVENT
297	/* 'event' [R] */
298	entry = proc_create("event", S_IRUSR, acpi_root_dir,
299			    &acpi_system_event_ops);
300	if (!entry)
301		return -ENODEV;
302#endif
303
304	return 0;
305}
306
307fs_initcall(acpi_event_init);
v5.4
  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * event.c - exporting ACPI events via procfs
  4 *
  5 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
  6 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
  7 *
  8 */
  9
 10#include <linux/spinlock.h>
 11#include <linux/export.h>
 12#include <linux/proc_fs.h>
 13#include <linux/init.h>
 14#include <linux/poll.h>
 15#include <linux/gfp.h>
 16#include <linux/acpi.h>
 17#include <net/netlink.h>
 18#include <net/genetlink.h>
 19
 20#include "internal.h"
 21
 22#define _COMPONENT		ACPI_SYSTEM_COMPONENT
 23ACPI_MODULE_NAME("event");
 24
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 25/* ACPI notifier chain */
 26static BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
 27
 28int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data)
 29{
 30	struct acpi_bus_event event;
 31
 32	strcpy(event.device_class, dev->pnp.device_class);
 33	strcpy(event.bus_id, dev->pnp.bus_id);
 34	event.type = type;
 35	event.data = data;
 36	return (blocking_notifier_call_chain(&acpi_chain_head, 0, (void *)&event)
 37                        == NOTIFY_BAD) ? -EINVAL : 0;
 38}
 39EXPORT_SYMBOL(acpi_notifier_call_chain);
 40
 41int register_acpi_notifier(struct notifier_block *nb)
 42{
 43	return blocking_notifier_chain_register(&acpi_chain_head, nb);
 44}
 45EXPORT_SYMBOL(register_acpi_notifier);
 46
 47int unregister_acpi_notifier(struct notifier_block *nb)
 48{
 49	return blocking_notifier_chain_unregister(&acpi_chain_head, nb);
 50}
 51EXPORT_SYMBOL(unregister_acpi_notifier);
 52
 53#ifdef CONFIG_NET
 54static unsigned int acpi_event_seqnum;
 55struct acpi_genl_event {
 56	acpi_device_class device_class;
 57	char bus_id[15];
 58	u32 type;
 59	u32 data;
 60};
 61
 62/* attributes of acpi_genl_family */
 63enum {
 64	ACPI_GENL_ATTR_UNSPEC,
 65	ACPI_GENL_ATTR_EVENT,	/* ACPI event info needed by user space */
 66	__ACPI_GENL_ATTR_MAX,
 67};
 68#define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1)
 69
 70/* commands supported by the acpi_genl_family */
 71enum {
 72	ACPI_GENL_CMD_UNSPEC,
 73	ACPI_GENL_CMD_EVENT,	/* kernel->user notifications for ACPI events */
 74	__ACPI_GENL_CMD_MAX,
 75};
 76#define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1)
 77
 78#define ACPI_GENL_FAMILY_NAME		"acpi_event"
 79#define ACPI_GENL_VERSION		0x01
 80#define ACPI_GENL_MCAST_GROUP_NAME 	"acpi_mc_group"
 81
 82static const struct genl_multicast_group acpi_event_mcgrps[] = {
 83	{ .name = ACPI_GENL_MCAST_GROUP_NAME, },
 84};
 85
 86static struct genl_family acpi_event_genl_family __ro_after_init = {
 87	.module = THIS_MODULE,
 88	.name = ACPI_GENL_FAMILY_NAME,
 89	.version = ACPI_GENL_VERSION,
 90	.maxattr = ACPI_GENL_ATTR_MAX,
 91	.mcgrps = acpi_event_mcgrps,
 92	.n_mcgrps = ARRAY_SIZE(acpi_event_mcgrps),
 
 
 93};
 94
 95int acpi_bus_generate_netlink_event(const char *device_class,
 96				      const char *bus_id,
 97				      u8 type, int data)
 98{
 99	struct sk_buff *skb;
100	struct nlattr *attr;
101	struct acpi_genl_event *event;
102	void *msg_header;
103	int size;
 
104
105	/* allocate memory */
106	size = nla_total_size(sizeof(struct acpi_genl_event)) +
107	    nla_total_size(0);
108
109	skb = genlmsg_new(size, GFP_ATOMIC);
110	if (!skb)
111		return -ENOMEM;
112
113	/* add the genetlink message header */
114	msg_header = genlmsg_put(skb, 0, acpi_event_seqnum++,
115				 &acpi_event_genl_family, 0,
116				 ACPI_GENL_CMD_EVENT);
117	if (!msg_header) {
118		nlmsg_free(skb);
119		return -ENOMEM;
120	}
121
122	/* fill the data */
123	attr =
124	    nla_reserve(skb, ACPI_GENL_ATTR_EVENT,
125			sizeof(struct acpi_genl_event));
126	if (!attr) {
127		nlmsg_free(skb);
128		return -EINVAL;
129	}
130
131	event = nla_data(attr);
 
 
 
 
 
132	memset(event, 0, sizeof(struct acpi_genl_event));
133
134	strscpy(event->device_class, device_class, sizeof(event->device_class));
135	strscpy(event->bus_id, bus_id, sizeof(event->bus_id));
136	event->type = type;
137	event->data = data;
138
139	/* send multicast genetlink message */
140	genlmsg_end(skb, msg_header);
 
 
 
 
141
142	genlmsg_multicast(&acpi_event_genl_family, skb, 0, 0, GFP_ATOMIC);
143	return 0;
144}
145
146EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
147
148static int __init acpi_event_genetlink_init(void)
149{
150	return genl_register_family(&acpi_event_genl_family);
 
 
 
 
 
 
 
 
 
 
 
151}
152
153#else
154int acpi_bus_generate_netlink_event(const char *device_class,
155				      const char *bus_id,
156				      u8 type, int data)
157{
158	return 0;
159}
160
161EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
162
163static int acpi_event_genetlink_init(void)
164{
165	return -ENODEV;
166}
167#endif
168
169static int __init acpi_event_init(void)
170{
 
 
 
171	int error = 0;
172
173	if (acpi_disabled)
174		return 0;
175
176	/* create genetlink for acpi event */
177	error = acpi_event_genetlink_init();
178	if (error)
179		printk(KERN_WARNING PREFIX
180		       "Failed to create genetlink family for ACPI event\n");
 
 
 
 
 
 
 
 
 
181	return 0;
182}
183
184fs_initcall(acpi_event_init);