Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/proc_fs.h>
3#include <linux/seq_file.h>
4#include <linux/string_choices.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
18static int
19acpi_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%llu\t",
34 dev->pnp.bus_id,
35 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 str_enabled_disabled(device_may_wakeup(&dev->dev)));
43 } else {
44 struct device *ldev;
45 list_for_each_entry(entry, &dev->physical_node_list,
46 node) {
47 ldev = get_device(entry->dev);
48 if (!ldev)
49 continue;
50
51 if (&entry->node !=
52 dev->physical_node_list.next)
53 seq_printf(seq, "\t\t");
54
55 seq_printf(seq, "%c%-8s %s:%s\n",
56 dev->wakeup.flags.valid ? '*' : ' ',
57 str_enabled_disabled(device_may_wakeup(ldev) ||
58 device_may_wakeup(&dev->dev)),
59 ldev->bus ? ldev->bus->name :
60 "no-bus", dev_name(ldev));
61 put_device(ldev);
62 }
63 }
64
65 mutex_unlock(&dev->physical_node_lock);
66 }
67 mutex_unlock(&acpi_device_lock);
68 return 0;
69}
70
71static void physical_device_enable_wakeup(struct acpi_device *adev)
72{
73 struct acpi_device_physical_node *entry;
74
75 mutex_lock(&adev->physical_node_lock);
76
77 list_for_each_entry(entry,
78 &adev->physical_node_list, node)
79 if (entry->dev && device_can_wakeup(entry->dev)) {
80 bool enable = !device_may_wakeup(entry->dev);
81 device_set_wakeup_enable(entry->dev, enable);
82 }
83
84 mutex_unlock(&adev->physical_node_lock);
85}
86
87static ssize_t
88acpi_system_write_wakeup_device(struct file *file,
89 const char __user * buffer,
90 size_t count, loff_t * ppos)
91{
92 struct acpi_device *dev, *tmp;
93 char strbuf[5];
94 char str[5] = "";
95
96 if (count > 4)
97 count = 4;
98
99 if (copy_from_user(strbuf, buffer, count))
100 return -EFAULT;
101 strbuf[count] = '\0';
102 sscanf(strbuf, "%s", str);
103
104 mutex_lock(&acpi_device_lock);
105 list_for_each_entry_safe(dev, tmp, &acpi_wakeup_device_list,
106 wakeup_list) {
107 if (!dev->wakeup.flags.valid)
108 continue;
109
110 if (!strncmp(dev->pnp.bus_id, str, 4)) {
111 if (device_can_wakeup(&dev->dev)) {
112 bool enable = !device_may_wakeup(&dev->dev);
113 device_set_wakeup_enable(&dev->dev, enable);
114 } else {
115 physical_device_enable_wakeup(dev);
116 }
117 break;
118 }
119 }
120 mutex_unlock(&acpi_device_lock);
121 return count;
122}
123
124static int
125acpi_system_wakeup_device_open_fs(struct inode *inode, struct file *file)
126{
127 return single_open(file, acpi_system_wakeup_device_seq_show,
128 pde_data(inode));
129}
130
131static const struct proc_ops acpi_system_wakeup_device_proc_ops = {
132 .proc_open = acpi_system_wakeup_device_open_fs,
133 .proc_read = seq_read,
134 .proc_write = acpi_system_write_wakeup_device,
135 .proc_lseek = seq_lseek,
136 .proc_release = single_release,
137};
138
139void __init acpi_sleep_proc_init(void)
140{
141 /* 'wakeup device' [R/W] */
142 proc_create("wakeup", 0644, acpi_root_dir, &acpi_system_wakeup_device_proc_ops);
143}