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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);
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#define pr_fmt(fmt) "ACPI: " fmt
11
12#include <linux/spinlock.h>
13#include <linux/export.h>
14#include <linux/proc_fs.h>
15#include <linux/init.h>
16#include <linux/poll.h>
17#include <linux/gfp.h>
18#include <linux/acpi.h>
19#include <net/netlink.h>
20#include <net/genetlink.h>
21
22#include "internal.h"
23
24/* ACPI notifier chain */
25static BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
26
27int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data)
28{
29 struct acpi_bus_event event;
30
31 strscpy(event.device_class, dev->pnp.device_class);
32 strscpy(event.bus_id, dev->pnp.bus_id);
33 event.type = type;
34 event.data = data;
35 return (blocking_notifier_call_chain(&acpi_chain_head, 0, (void *)&event)
36 == NOTIFY_BAD) ? -EINVAL : 0;
37}
38EXPORT_SYMBOL(acpi_notifier_call_chain);
39
40int register_acpi_notifier(struct notifier_block *nb)
41{
42 return blocking_notifier_chain_register(&acpi_chain_head, nb);
43}
44EXPORT_SYMBOL(register_acpi_notifier);
45
46int unregister_acpi_notifier(struct notifier_block *nb)
47{
48 return blocking_notifier_chain_unregister(&acpi_chain_head, nb);
49}
50EXPORT_SYMBOL(unregister_acpi_notifier);
51
52#ifdef CONFIG_NET
53static unsigned int acpi_event_seqnum;
54struct acpi_genl_event {
55 acpi_device_class device_class;
56 char bus_id[15];
57 u32 type;
58 u32 data;
59};
60
61/* attributes of acpi_genl_family */
62enum {
63 ACPI_GENL_ATTR_UNSPEC,
64 ACPI_GENL_ATTR_EVENT, /* ACPI event info needed by user space */
65 __ACPI_GENL_ATTR_MAX,
66};
67#define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1)
68
69/* commands supported by the acpi_genl_family */
70enum {
71 ACPI_GENL_CMD_UNSPEC,
72 ACPI_GENL_CMD_EVENT, /* kernel->user notifications for ACPI events */
73 __ACPI_GENL_CMD_MAX,
74};
75#define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1)
76
77#define ACPI_GENL_FAMILY_NAME "acpi_event"
78#define ACPI_GENL_VERSION 0x01
79#define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group"
80
81static const struct genl_multicast_group acpi_event_mcgrps[] = {
82 { .name = ACPI_GENL_MCAST_GROUP_NAME, },
83};
84
85static struct genl_family acpi_event_genl_family __ro_after_init = {
86 .module = THIS_MODULE,
87 .name = ACPI_GENL_FAMILY_NAME,
88 .version = ACPI_GENL_VERSION,
89 .maxattr = ACPI_GENL_ATTR_MAX,
90 .mcgrps = acpi_event_mcgrps,
91 .n_mcgrps = ARRAY_SIZE(acpi_event_mcgrps),
92};
93
94int acpi_bus_generate_netlink_event(const char *device_class,
95 const char *bus_id,
96 u8 type, int data)
97{
98 struct sk_buff *skb;
99 struct nlattr *attr;
100 struct acpi_genl_event *event;
101 void *msg_header;
102 int size;
103
104 /* allocate memory */
105 size = nla_total_size(sizeof(struct acpi_genl_event)) +
106 nla_total_size(0);
107
108 skb = genlmsg_new(size, GFP_ATOMIC);
109 if (!skb)
110 return -ENOMEM;
111
112 /* add the genetlink message header */
113 msg_header = genlmsg_put(skb, 0, acpi_event_seqnum++,
114 &acpi_event_genl_family, 0,
115 ACPI_GENL_CMD_EVENT);
116 if (!msg_header) {
117 nlmsg_free(skb);
118 return -ENOMEM;
119 }
120
121 /* fill the data */
122 attr =
123 nla_reserve(skb, ACPI_GENL_ATTR_EVENT,
124 sizeof(struct acpi_genl_event));
125 if (!attr) {
126 nlmsg_free(skb);
127 return -EINVAL;
128 }
129
130 event = nla_data(attr);
131 memset(event, 0, sizeof(struct acpi_genl_event));
132
133 strscpy(event->device_class, device_class, sizeof(event->device_class));
134 strscpy(event->bus_id, bus_id, sizeof(event->bus_id));
135 event->type = type;
136 event->data = data;
137
138 /* send multicast genetlink message */
139 genlmsg_end(skb, msg_header);
140
141 genlmsg_multicast(&acpi_event_genl_family, skb, 0, 0, GFP_ATOMIC);
142 return 0;
143}
144
145EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
146
147static int __init acpi_event_genetlink_init(void)
148{
149 return genl_register_family(&acpi_event_genl_family);
150}
151
152#else
153int acpi_bus_generate_netlink_event(const char *device_class,
154 const char *bus_id,
155 u8 type, int data)
156{
157 return 0;
158}
159
160EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
161
162static int acpi_event_genetlink_init(void)
163{
164 return -ENODEV;
165}
166#endif
167
168static int __init acpi_event_init(void)
169{
170 int error;
171
172 if (acpi_disabled)
173 return 0;
174
175 /* create genetlink for acpi event */
176 error = acpi_event_genetlink_init();
177 if (error)
178 pr_warn("Failed to create genetlink family for ACPI event\n");
179
180 return 0;
181}
182
183fs_initcall(acpi_event_init);