drivers/acpi/proc.c

   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 <asm/uaccess.h>
   8
   9 #include "sleep.h"
  10
  11 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
  12
  13 /*
  14  * this file provides support for:
  15  * /proc/acpi/wakeup
  16  */
  17
  18 ACPI_MODULE_NAME("sleep")
  19
  20 static int
  21 acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
  22 {
  23         struct list_head *node, *next;
  24
  25         seq_printf(seq, "Device\tS-state\t  Status   Sysfs node\n");
  26
  27         mutex_lock(&acpi_device_lock);
  28         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
  29                 struct acpi_device *dev =
  30                     container_of(node, struct acpi_device, wakeup_list);
  31                 struct acpi_device_physical_node *entry;
  32
  33                 if (!dev->wakeup.flags.valid)
  34                         continue;
  35
  36                 seq_printf(seq, "%s\t  S%d\t",
  37                            dev->pnp.bus_id,
  38                            (u32) dev->wakeup.sleep_state);
  39
  40                 mutex_lock(&dev->physical_node_lock);
  41
  42                 if (!dev->physical_node_count) {
  43                         seq_printf(seq, "%c%-8s\n",
  44                                 dev->wakeup.flags.run_wake ? '*' : ' ',
  45                                 device_may_wakeup(&dev->dev) ?
  46                                         "enabled" : "disabled");
  47                 } else {
  48                         struct device *ldev;
  49                         list_for_each_entry(entry, &dev->physical_node_list,
  50                                         node) {
  51                                 ldev = get_device(entry->dev);
  52                                 if (!ldev)
  53                                         continue;
  54
  55                                 if (&entry->node !=
  56                                                 dev->physical_node_list.next)
  57                                         seq_printf(seq, "\t\t");
  58
  59                                 seq_printf(seq, "%c%-8s  %s:%s\n",
  60                                         dev->wakeup.flags.run_wake ? '*' : ' ',
  61                                         (device_may_wakeup(&dev->dev) ||
  62                                         (ldev && device_may_wakeup(ldev))) ?
  63                                         "enabled" : "disabled",
  64                                         ldev->bus ? ldev->bus->name :
  65                                         "no-bus", dev_name(ldev));
  66                                 put_device(ldev);
  67                         }
  68                 }
  69
  70                 mutex_unlock(&dev->physical_node_lock);
  71         }
  72         mutex_unlock(&acpi_device_lock);
  73         return 0;
  74 }
  75
  76 static void physical_device_enable_wakeup(struct acpi_device *adev)
  77 {
  78         struct acpi_device_physical_node *entry;
  79
  80         mutex_lock(&adev->physical_node_lock);
  81
  82         list_for_each_entry(entry,
  83                 &adev->physical_node_list, node)
  84                 if (entry->dev && device_can_wakeup(entry->dev)) {
  85                         bool enable = !device_may_wakeup(entry->dev);
  86                         device_set_wakeup_enable(entry->dev, enable);
  87                 }
  88
  89         mutex_unlock(&adev->physical_node_lock);
  90 }
  91
  92 static ssize_t
  93 acpi_system_write_wakeup_device(struct file *file,
  94                                 const char __user * buffer,
  95                                 size_t count, loff_t * ppos)
  96 {
  97         struct list_head *node, *next;
  98         char strbuf[5];
  99         char str[5] = "";
 100
 101         if (count > 4)
 102                 count = 4;
 103
 104         if (copy_from_user(strbuf, buffer, count))
 105                 return -EFAULT;
 106         strbuf[count] = '\0';
 107         sscanf(strbuf, "%s", str);
 108
 109         mutex_lock(&acpi_device_lock);
 110         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
 111                 struct acpi_device *dev =
 112                     container_of(node, struct acpi_device, wakeup_list);
 113                 if (!dev->wakeup.flags.valid)
 114                         continue;
 115
 116                 if (!strncmp(dev->pnp.bus_id, str, 4)) {
 117                         if (device_can_wakeup(&dev->dev)) {
 118                                 bool enable = !device_may_wakeup(&dev->dev);
 119                                 device_set_wakeup_enable(&dev->dev, enable);
 120                         } else {
 121                                 physical_device_enable_wakeup(dev);
 122                         }
 123                         break;
 124                 }
 125         }
 126         mutex_unlock(&acpi_device_lock);
 127         return count;
 128 }
 129
 130 static int
 131 acpi_system_wakeup_device_open_fs(struct inode *inode, struct file *file)
 132 {
 133         return single_open(file, acpi_system_wakeup_device_seq_show,
 134                            PDE_DATA(inode));
 135 }
 136
 137 static const struct file_operations acpi_system_wakeup_device_fops = {
 138         .owner = THIS_MODULE,
 139         .open = acpi_system_wakeup_device_open_fs,
 140         .read = seq_read,
 141         .write = acpi_system_write_wakeup_device,
 142         .llseek = seq_lseek,
 143         .release = single_release,
 144 };
 145
 146 int __init acpi_sleep_proc_init(void)
 147 {
 148         /* 'wakeup device' [R/W] */
 149         proc_create("wakeup", S_IFREG | S_IRUGO | S_IWUSR,
 150                     acpi_root_dir, &acpi_system_wakeup_device_fops);
 151
 152         return 0;
 153 }