1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/proc_fs.h> 3 #include <linux/seq_file.h> 4 #include <linux/string_choices.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/wakeup 16 */ 17 18 static int 19 acpi_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%llu\t", 34 dev->pnp.bus_id, 35 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 str_enabled_disabled(device_may_wakeup(&dev->dev))); 43 } else { 44 struct device *ldev; 45 list_for_each_entry(entry, &dev->physical_node_list, 46 node) { 47 ldev = get_device(entry->dev); 48 if (!ldev) 49 continue; 50 51 if (&entry->node != 52 dev->physical_node_list.next) 53 seq_printf(seq, "\t\t"); 54 55 seq_printf(seq, "%c%-8s %s:%s\n", 56 dev->wakeup.flags.valid ? '*' : ' ', 57 str_enabled_disabled(device_may_wakeup(ldev) || 58 device_may_wakeup(&dev->dev)), 59 ldev->bus ? ldev->bus->name : 60 "no-bus", dev_name(ldev)); 61 put_device(ldev); 62 } 63 } 64 65 mutex_unlock(&dev->physical_node_lock); 66 } 67 mutex_unlock(&acpi_device_lock); 68 return 0; 69 } 70 71 static void physical_device_enable_wakeup(struct acpi_device *adev) 72 { 73 struct acpi_device_physical_node *entry; 74 75 mutex_lock(&adev->physical_node_lock); 76 77 list_for_each_entry(entry, 78 &adev->physical_node_list, node) 79 if (entry->dev && device_can_wakeup(entry->dev)) { 80 bool enable = !device_may_wakeup(entry->dev); 81 device_set_wakeup_enable(entry->dev, enable); 82 } 83 84 mutex_unlock(&adev->physical_node_lock); 85 } 86 87 static ssize_t 88 acpi_system_write_wakeup_device(struct file *file, 89 const char __user * buffer, 90 size_t count, loff_t * ppos) 91 { 92 struct acpi_device *dev, *tmp; 93 char strbuf[5]; 94 char str[5] = ""; 95 96 if (count > 4) 97 count = 4; 98 99 if (copy_from_user(strbuf, buffer, count)) 100 return -EFAULT; 101 strbuf[count] = '\0'; 102 sscanf(strbuf, "%s", str); 103 104 mutex_lock(&acpi_device_lock); 105 list_for_each_entry_safe(dev, tmp, &acpi_wakeup_device_list, 106 wakeup_list) { 107 if (!dev->wakeup.flags.valid) 108 continue; 109 110 if (!strncmp(dev->pnp.bus_id, str, 4)) { 111 if (device_can_wakeup(&dev->dev)) { 112 bool enable = !device_may_wakeup(&dev->dev); 113 device_set_wakeup_enable(&dev->dev, enable); 114 } else { 115 physical_device_enable_wakeup(dev); 116 } 117 break; 118 } 119 } 120 mutex_unlock(&acpi_device_lock); 121 return count; 122 } 123 124 static int 125 acpi_system_wakeup_device_open_fs(struct inode *inode, struct file *file) 126 { 127 return single_open(file, acpi_system_wakeup_device_seq_show, 128 pde_data(inode)); 129 } 130 131 static const struct proc_ops acpi_system_wakeup_device_proc_ops = { 132 .proc_open = acpi_system_wakeup_device_open_fs, 133 .proc_read = seq_read, 134 .proc_write = acpi_system_write_wakeup_device, 135 .proc_lseek = seq_lseek, 136 .proc_release = single_release, 137 }; 138 139 void __init acpi_sleep_proc_init(void) 140 { 141 /* 'wakeup device' [R/W] */ 142 proc_create("wakeup", 0644, acpi_root_dir, &acpi_system_wakeup_device_proc_ops); 143 } 144