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
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%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
73static 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
89static ssize_t
90acpi_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
126static int
127acpi_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
133static 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
141void __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