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 /* 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%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 73 static 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 89 static ssize_t 90 acpi_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 } 125 126 static int 127 acpi_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 } 132 133 static 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 }; 140 141 void __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