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