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