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 acpi_device *dev, *tmp; 26 27 seq_printf(seq, "Device\tS-state\t Status Sysfs node\n"); 28 29 mutex_lock(&acpi_device_lock); 30 list_for_each_entry_safe(dev, tmp, &acpi_wakeup_device_list, 31 wakeup_list) { 32 struct acpi_device_physical_node *entry; 33 34 if (!dev->wakeup.flags.valid) 35 continue; 36 37 seq_printf(seq, "%s\t S%d\t", 38 dev->pnp.bus_id, 39 (u32) dev->wakeup.sleep_state); 40 41 mutex_lock(&dev->physical_node_lock); 42 43 if (!dev->physical_node_count) { 44 seq_printf(seq, "%c%-8s\n", 45 dev->wakeup.flags.valid ? '*' : ' ', 46 device_may_wakeup(&dev->dev) ? 47 "enabled" : "disabled"); 48 } else { 49 struct device *ldev; 50 list_for_each_entry(entry, &dev->physical_node_list, 51 node) { 52 ldev = get_device(entry->dev); 53 if (!ldev) 54 continue; 55 56 if (&entry->node != 57 dev->physical_node_list.next) 58 seq_printf(seq, "\t\t"); 59 60 seq_printf(seq, "%c%-8s %s:%s\n", 61 dev->wakeup.flags.valid ? '*' : ' ', 62 (device_may_wakeup(&dev->dev) || 63 device_may_wakeup(ldev)) ? 64 "enabled" : "disabled", 65 ldev->bus ? ldev->bus->name : 66 "no-bus", dev_name(ldev)); 67 put_device(ldev); 68 } 69 } 70 71 mutex_unlock(&dev->physical_node_lock); 72 } 73 mutex_unlock(&acpi_device_lock); 74 return 0; 75 } 76 77 static void physical_device_enable_wakeup(struct acpi_device *adev) 78 { 79 struct acpi_device_physical_node *entry; 80 81 mutex_lock(&adev->physical_node_lock); 82 83 list_for_each_entry(entry, 84 &adev->physical_node_list, node) 85 if (entry->dev && device_can_wakeup(entry->dev)) { 86 bool enable = !device_may_wakeup(entry->dev); 87 device_set_wakeup_enable(entry->dev, enable); 88 } 89 90 mutex_unlock(&adev->physical_node_lock); 91 } 92 93 static ssize_t 94 acpi_system_write_wakeup_device(struct file *file, 95 const char __user * buffer, 96 size_t count, loff_t * ppos) 97 { 98 struct acpi_device *dev, *tmp; 99 char strbuf[5]; 100 char str[5] = ""; 101 102 if (count > 4) 103 count = 4; 104 105 if (copy_from_user(strbuf, buffer, count)) 106 return -EFAULT; 107 strbuf[count] = '\0'; 108 sscanf(strbuf, "%s", str); 109 110 mutex_lock(&acpi_device_lock); 111 list_for_each_entry_safe(dev, tmp, &acpi_wakeup_device_list, 112 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 proc_ops acpi_system_wakeup_device_proc_ops = { 138 .proc_open = acpi_system_wakeup_device_open_fs, 139 .proc_read = seq_read, 140 .proc_write = acpi_system_write_wakeup_device, 141 .proc_lseek = seq_lseek, 142 .proc_release = single_release, 143 }; 144 145 void __init acpi_sleep_proc_init(void) 146 { 147 /* 'wakeup device' [R/W] */ 148 proc_create("wakeup", S_IFREG | S_IRUGO | S_IWUSR, 149 acpi_root_dir, &acpi_system_wakeup_device_proc_ops); 150 } 151