drivers/acpi/proc.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <linux/proc_fs.h>
0003 #include <linux/seq_file.h>
0004 #include <linux/export.h>
0005 #include <linux/suspend.h>
0006 #include <linux/bcd.h>
0007 #include <linux/acpi.h>
0008 #include <linux/uaccess.h>
0009
0010 #include "sleep.h"
0011 #include "internal.h"
0012
0013 /*
0014  * this file provides support for:
0015  * /proc/acpi/wakeup
0016  */
0017
0018 static int
0019 acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
0020 {
0021     struct acpi_device *dev, *tmp;
0022
0023     seq_printf(seq, "Device\tS-state\t  Status   Sysfs node\n");
0024
0025     mutex_lock(&acpi_device_lock);
0026     list_for_each_entry_safe(dev, tmp, &acpi_wakeup_device_list,
0027                  wakeup_list) {
0028         struct acpi_device_physical_node *entry;
0029
0030         if (!dev->wakeup.flags.valid)
0031             continue;
0032
0033         seq_printf(seq, "%s\t  S%d\t",
0034                dev->pnp.bus_id,
0035                (u32) dev->wakeup.sleep_state);
0036
0037         mutex_lock(&dev->physical_node_lock);
0038
0039         if (!dev->physical_node_count) {
0040             seq_printf(seq, "%c%-8s\n",
0041                 dev->wakeup.flags.valid ? '*' : ' ',
0042                 device_may_wakeup(&dev->dev) ?
0043                     "enabled" : "disabled");
0044         } else {
0045             struct device *ldev;
0046             list_for_each_entry(entry, &dev->physical_node_list,
0047                     node) {
0048                 ldev = get_device(entry->dev);
0049                 if (!ldev)
0050                     continue;
0051
0052                 if (&entry->node !=
0053                         dev->physical_node_list.next)
0054                     seq_printf(seq, "\t\t");
0055
0056                 seq_printf(seq, "%c%-8s  %s:%s\n",
0057                     dev->wakeup.flags.valid ? '*' : ' ',
0058                     (device_may_wakeup(&dev->dev) ||
0059                     device_may_wakeup(ldev)) ?
0060                     "enabled" : "disabled",
0061                     ldev->bus ? ldev->bus->name :
0062                     "no-bus", dev_name(ldev));
0063                 put_device(ldev);
0064             }
0065         }
0066
0067         mutex_unlock(&dev->physical_node_lock);
0068     }
0069     mutex_unlock(&acpi_device_lock);
0070     return 0;
0071 }
0072
0073 static void physical_device_enable_wakeup(struct acpi_device *adev)
0074 {
0075     struct acpi_device_physical_node *entry;
0076
0077     mutex_lock(&adev->physical_node_lock);
0078
0079     list_for_each_entry(entry,
0080         &adev->physical_node_list, node)
0081         if (entry->dev && device_can_wakeup(entry->dev)) {
0082             bool enable = !device_may_wakeup(entry->dev);
0083             device_set_wakeup_enable(entry->dev, enable);
0084         }
0085
0086     mutex_unlock(&adev->physical_node_lock);
0087 }
0088
0089 static ssize_t
0090 acpi_system_write_wakeup_device(struct file *file,
0091                 const char __user * buffer,
0092                 size_t count, loff_t * ppos)
0093 {
0094     struct acpi_device *dev, *tmp;
0095     char strbuf[5];
0096     char str[5] = "";
0097
0098     if (count > 4)
0099         count = 4;
0100
0101     if (copy_from_user(strbuf, buffer, count))
0102         return -EFAULT;
0103     strbuf[count] = '\0';
0104     sscanf(strbuf, "%s", str);
0105
0106     mutex_lock(&acpi_device_lock);
0107     list_for_each_entry_safe(dev, tmp, &acpi_wakeup_device_list,
0108                  wakeup_list) {
0109         if (!dev->wakeup.flags.valid)
0110             continue;
0111
0112         if (!strncmp(dev->pnp.bus_id, str, 4)) {
0113             if (device_can_wakeup(&dev->dev)) {
0114                 bool enable = !device_may_wakeup(&dev->dev);
0115                 device_set_wakeup_enable(&dev->dev, enable);
0116             } else {
0117                 physical_device_enable_wakeup(dev);
0118             }
0119             break;
0120         }
0121     }
0122     mutex_unlock(&acpi_device_lock);
0123     return count;
0124 }
0125
0126 static int
0127 acpi_system_wakeup_device_open_fs(struct inode *inode, struct file *file)
0128 {
0129     return single_open(file, acpi_system_wakeup_device_seq_show,
0130                pde_data(inode));
0131 }
0132
0133 static const struct proc_ops acpi_system_wakeup_device_proc_ops = {
0134     .proc_open  = acpi_system_wakeup_device_open_fs,
0135     .proc_read  = seq_read,
0136     .proc_write = acpi_system_write_wakeup_device,
0137     .proc_lseek = seq_lseek,
0138     .proc_release   = single_release,
0139 };
0140
0141 void __init acpi_sleep_proc_init(void)
0142 {
0143     /* 'wakeup device' [R/W] */
0144     proc_create("wakeup", S_IFREG | S_IRUGO | S_IWUSR,
0145             acpi_root_dir, &acpi_system_wakeup_device_proc_ops);
0146 }