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1// SPDX-License-Identifier: GPL-2.02#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/wakeup16 */17 18static int19acpi_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 73static 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 89static ssize_t90acpi_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 126static int127acpi_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 133static 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 141void __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