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