drivers/acpi/proc.c

   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 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
  14
  15 /*
  16  * this file provides support for:
  17  * /proc/acpi/wakeup
  18  */
  19
  20 ACPI_MODULE_NAME("sleep")
  21
  22 static int
  23 acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
  24 {
  25         struct list_head *node, *next;
  26
  27         seq_printf(seq, "Device\tS-state\t  Status   Sysfs node\n");
  28
  29         mutex_lock(&acpi_device_lock);
  30         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
  31                 struct acpi_device *dev =
  32                     container_of(node, struct acpi_device, wakeup_list);
  33                 struct acpi_device_physical_node *entry;
  34
  35                 if (!dev->wakeup.flags.valid)
  36                         continue;
  37
  38                 seq_printf(seq, "%s\t  S%d\t",
  39                            dev->pnp.bus_id,
  40                            (u32) dev->wakeup.sleep_state);
  41
  42                 mutex_lock(&dev->physical_node_lock);
  43
  44                 if (!dev->physical_node_count) {
  45                         seq_printf(seq, "%c%-8s\n",
  46                                 dev->wakeup.flags.valid ? '*' : ' ',
  47                                 device_may_wakeup(&dev->dev) ?
  48                                         "enabled" : "disabled");
  49                 } else {
  50                         struct device *ldev;
  51                         list_for_each_entry(entry, &dev->physical_node_list,
  52                                         node) {
  53                                 ldev = get_device(entry->dev);
  54                                 if (!ldev)
  55                                         continue;
  56
  57                                 if (&entry->node !=
  58                                                 dev->physical_node_list.next)
  59                                         seq_printf(seq, "\t\t");
  60
  61                                 seq_printf(seq, "%c%-8s  %s:%s\n",
  62                                         dev->wakeup.flags.valid ? '*' : ' ',
  63                                         (device_may_wakeup(&dev->dev) ||
  64                                         device_may_wakeup(ldev)) ?
  65                                         "enabled" : "disabled",
  66                                         ldev->bus ? ldev->bus->name :
  67                                         "no-bus", dev_name(ldev));
  68                                 put_device(ldev);
  69                         }
  70                 }
  71
  72                 mutex_unlock(&dev->physical_node_lock);
  73         }
  74         mutex_unlock(&acpi_device_lock);
  75         return 0;
  76 }
  77
  78 static void physical_device_enable_wakeup(struct acpi_device *adev)
  79 {
  80         struct acpi_device_physical_node *entry;
  81
  82         mutex_lock(&adev->physical_node_lock);
  83
  84         list_for_each_entry(entry,
  85                 &adev->physical_node_list, node)
  86                 if (entry->dev && device_can_wakeup(entry->dev)) {
  87                         bool enable = !device_may_wakeup(entry->dev);
  88                         device_set_wakeup_enable(entry->dev, enable);
  89                 }
  90
  91         mutex_unlock(&adev->physical_node_lock);
  92 }
  93
  94 static ssize_t
  95 acpi_system_write_wakeup_device(struct file *file,
  96                                 const char __user * buffer,
  97                                 size_t count, loff_t * ppos)
  98 {
  99         struct list_head *node, *next;
 100         char strbuf[5];
 101         char str[5] = "";
 102
 103         if (count > 4)
 104                 count = 4;
 105
 106         if (copy_from_user(strbuf, buffer, count))
 107                 return -EFAULT;
 108         strbuf[count] = '\0';
 109         sscanf(strbuf, "%s", str);
 110
 111         mutex_lock(&acpi_device_lock);
 112         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
 113                 struct acpi_device *dev =
 114                     container_of(node, struct acpi_device, wakeup_list);
 115                 if (!dev->wakeup.flags.valid)
 116                         continue;
 117
 118                 if (!strncmp(dev->pnp.bus_id, str, 4)) {
 119                         if (device_can_wakeup(&dev->dev)) {
 120                                 bool enable = !device_may_wakeup(&dev->dev);
 121                                 device_set_wakeup_enable(&dev->dev, enable);
 122                         } else {
 123                                 physical_device_enable_wakeup(dev);
 124                         }
 125                         break;
 126                 }
 127         }
 128         mutex_unlock(&acpi_device_lock);
 129         return count;
 130 }
 131
 132 static int
 133 acpi_system_wakeup_device_open_fs(struct inode *inode, struct file *file)
 134 {
 135         return single_open(file, acpi_system_wakeup_device_seq_show,
 136                            PDE_DATA(inode));
 137 }
 138
 139 static const struct file_operations acpi_system_wakeup_device_fops = {
 140         .owner = THIS_MODULE,
 141         .open = acpi_system_wakeup_device_open_fs,
 142         .read = seq_read,
 143         .write = acpi_system_write_wakeup_device,
 144         .llseek = seq_lseek,
 145         .release = single_release,
 146 };
 147
 148 void __init acpi_sleep_proc_init(void)
 149 {
 150         /* 'wakeup device' [R/W] */
 151         proc_create("wakeup", S_IFREG | S_IRUGO | S_IWUSR,
 152                     acpi_root_dir, &acpi_system_wakeup_device_fops);
 153 }