1 #include <linux/proc_fs.h> 2 #include <linux/seq_file.h> 3 #include <linux/export.h> 4 #include <linux/suspend.h> 5 #include <linux/bcd.h> 6 #include <linux/acpi.h> 7 #include <linux/uaccess.h> 8 9 #include "sleep.h" 10 #include "internal.h" 11 12 #define _COMPONENT ACPI_SYSTEM_COMPONENT 13 14 /* 15 * this file provides support for: 16 * /proc/acpi/wakeup 17 */ 18 19 ACPI_MODULE_NAME("sleep") 20 21 static int 22 acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset) 23 { 24 struct list_head *node, *next; 25 26 seq_printf(seq, "Device\tS-state\t Status Sysfs node\n"); 27 28 mutex_lock(&acpi_device_lock); 29 list_for_each_safe(node, next, &acpi_wakeup_device_list) { 30 struct acpi_device *dev = 31 container_of(node, struct acpi_device, 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.run_wake ? '*' : ' ', 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.run_wake ? '*' : ' ', 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 list_head *node, *next; 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_safe(node, next, &acpi_wakeup_device_list) { 112 struct acpi_device *dev = 113 container_of(node, struct acpi_device, wakeup_list); 114 if (!dev->wakeup.flags.valid) 115 continue; 116 117 if (!strncmp(dev->pnp.bus_id, str, 4)) { 118 if (device_can_wakeup(&dev->dev)) { 119 bool enable = !device_may_wakeup(&dev->dev); 120 device_set_wakeup_enable(&dev->dev, enable); 121 } else { 122 physical_device_enable_wakeup(dev); 123 } 124 break; 125 } 126 } 127 mutex_unlock(&acpi_device_lock); 128 return count; 129 } 130 131 static int 132 acpi_system_wakeup_device_open_fs(struct inode *inode, struct file *file) 133 { 134 return single_open(file, acpi_system_wakeup_device_seq_show, 135 PDE_DATA(inode)); 136 } 137 138 static const struct file_operations acpi_system_wakeup_device_fops = { 139 .owner = THIS_MODULE, 140 .open = acpi_system_wakeup_device_open_fs, 141 .read = seq_read, 142 .write = acpi_system_write_wakeup_device, 143 .llseek = seq_lseek, 144 .release = single_release, 145 }; 146 147 void __init acpi_sleep_proc_init(void) 148 { 149 /* 'wakeup device' [R/W] */ 150 proc_create("wakeup", S_IFREG | S_IRUGO | S_IWUSR, 151 acpi_root_dir, &acpi_system_wakeup_device_fops); 152 } 153