1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/proc_fs.h>
3 #include <linux/seq_file.h>
4 #include <linux/export.h>
5 #include <linux/suspend.h>
6 #include <linux/bcd.h>
7 #include <linux/acpi.h>
8 #include <linux/uaccess.h>
9
10 #include "sleep.h"
11 #include "internal.h"
12
13 #define _COMPONENT ACPI_SYSTEM_COMPONENT
14
15 /*
16 * this file provides support for:
17 * /proc/acpi/wakeup
18 */
19
20 ACPI_MODULE_NAME("sleep")
21
22 static int
acpi_system_wakeup_device_seq_show(struct seq_file * seq,void * offset)23 acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
24 {
25 struct list_head *node, *next;
26
27 seq_printf(seq, "Device\tS-state\t Status Sysfs node\n");
28
29 mutex_lock(&acpi_device_lock);
30 list_for_each_safe(node, next, &acpi_wakeup_device_list) {
31 struct acpi_device *dev =
32 container_of(node, struct acpi_device, wakeup_list);
33 struct acpi_device_physical_node *entry;
34
35 if (!dev->wakeup.flags.valid)
36 continue;
37
38 seq_printf(seq, "%s\t S%d\t",
39 dev->pnp.bus_id,
40 (u32) dev->wakeup.sleep_state);
41
42 mutex_lock(&dev->physical_node_lock);
43
44 if (!dev->physical_node_count) {
45 seq_printf(seq, "%c%-8s\n",
46 dev->wakeup.flags.valid ? '*' : ' ',
47 device_may_wakeup(&dev->dev) ?
48 "enabled" : "disabled");
49 } else {
50 struct device *ldev;
51 list_for_each_entry(entry, &dev->physical_node_list,
52 node) {
53 ldev = get_device(entry->dev);
54 if (!ldev)
55 continue;
56
57 if (&entry->node !=
58 dev->physical_node_list.next)
59 seq_printf(seq, "\t\t");
60
61 seq_printf(seq, "%c%-8s %s:%s\n",
62 dev->wakeup.flags.valid ? '*' : ' ',
63 (device_may_wakeup(&dev->dev) ||
64 device_may_wakeup(ldev)) ?
65 "enabled" : "disabled",
66 ldev->bus ? ldev->bus->name :
67 "no-bus", dev_name(ldev));
68 put_device(ldev);
69 }
70 }
71
72 mutex_unlock(&dev->physical_node_lock);
73 }
74 mutex_unlock(&acpi_device_lock);
75 return 0;
76 }
77
physical_device_enable_wakeup(struct acpi_device * adev)78 static void physical_device_enable_wakeup(struct acpi_device *adev)
79 {
80 struct acpi_device_physical_node *entry;
81
82 mutex_lock(&adev->physical_node_lock);
83
84 list_for_each_entry(entry,
85 &adev->physical_node_list, node)
86 if (entry->dev && device_can_wakeup(entry->dev)) {
87 bool enable = !device_may_wakeup(entry->dev);
88 device_set_wakeup_enable(entry->dev, enable);
89 }
90
91 mutex_unlock(&adev->physical_node_lock);
92 }
93
94 static ssize_t
acpi_system_write_wakeup_device(struct file * file,const char __user * buffer,size_t count,loff_t * ppos)95 acpi_system_write_wakeup_device(struct file *file,
96 const char __user * buffer,
97 size_t count, loff_t * ppos)
98 {
99 struct list_head *node, *next;
100 char strbuf[5];
101 char str[5] = "";
102
103 if (count > 4)
104 count = 4;
105
106 if (copy_from_user(strbuf, buffer, count))
107 return -EFAULT;
108 strbuf[count] = '\0';
109 sscanf(strbuf, "%s", str);
110
111 mutex_lock(&acpi_device_lock);
112 list_for_each_safe(node, next, &acpi_wakeup_device_list) {
113 struct acpi_device *dev =
114 container_of(node, struct acpi_device, wakeup_list);
115 if (!dev->wakeup.flags.valid)
116 continue;
117
118 if (!strncmp(dev->pnp.bus_id, str, 4)) {
119 if (device_can_wakeup(&dev->dev)) {
120 bool enable = !device_may_wakeup(&dev->dev);
121 device_set_wakeup_enable(&dev->dev, enable);
122 } else {
123 physical_device_enable_wakeup(dev);
124 }
125 break;
126 }
127 }
128 mutex_unlock(&acpi_device_lock);
129 return count;
130 }
131
132 static int
acpi_system_wakeup_device_open_fs(struct inode * inode,struct file * file)133 acpi_system_wakeup_device_open_fs(struct inode *inode, struct file *file)
134 {
135 return single_open(file, acpi_system_wakeup_device_seq_show,
136 PDE_DATA(inode));
137 }
138
139 static const struct file_operations acpi_system_wakeup_device_fops = {
140 .owner = THIS_MODULE,
141 .open = acpi_system_wakeup_device_open_fs,
142 .read = seq_read,
143 .write = acpi_system_write_wakeup_device,
144 .llseek = seq_lseek,
145 .release = single_release,
146 };
147
acpi_sleep_proc_init(void)148 void __init acpi_sleep_proc_init(void)
149 {
150 /* 'wakeup device' [R/W] */
151 proc_create("wakeup", S_IFREG | S_IRUGO | S_IWUSR,
152 acpi_root_dir, &acpi_system_wakeup_device_fops);
153 }
154
