v4.19.13 snapshot.
diff --git a/drivers/acpi/proc.c b/drivers/acpi/proc.c
new file mode 100644
index 0000000..652f19e
--- /dev/null
+++ b/drivers/acpi/proc.c
@@ -0,0 +1,153 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/export.h>
+#include <linux/suspend.h>
+#include <linux/bcd.h>
+#include <linux/acpi.h>
+#include <linux/uaccess.h>
+
+#include "sleep.h"
+#include "internal.h"
+
+#define _COMPONENT ACPI_SYSTEM_COMPONENT
+
+/*
+ * this file provides support for:
+ * /proc/acpi/wakeup
+ */
+
+ACPI_MODULE_NAME("sleep")
+
+static int
+acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
+{
+ struct list_head *node, *next;
+
+ seq_printf(seq, "Device\tS-state\t Status Sysfs node\n");
+
+ mutex_lock(&acpi_device_lock);
+ list_for_each_safe(node, next, &acpi_wakeup_device_list) {
+ struct acpi_device *dev =
+ container_of(node, struct acpi_device, wakeup_list);
+ struct acpi_device_physical_node *entry;
+
+ if (!dev->wakeup.flags.valid)
+ continue;
+
+ seq_printf(seq, "%s\t S%d\t",
+ dev->pnp.bus_id,
+ (u32) dev->wakeup.sleep_state);
+
+ mutex_lock(&dev->physical_node_lock);
+
+ if (!dev->physical_node_count) {
+ seq_printf(seq, "%c%-8s\n",
+ dev->wakeup.flags.valid ? '*' : ' ',
+ device_may_wakeup(&dev->dev) ?
+ "enabled" : "disabled");
+ } else {
+ struct device *ldev;
+ list_for_each_entry(entry, &dev->physical_node_list,
+ node) {
+ ldev = get_device(entry->dev);
+ if (!ldev)
+ continue;
+
+ if (&entry->node !=
+ dev->physical_node_list.next)
+ seq_printf(seq, "\t\t");
+
+ seq_printf(seq, "%c%-8s %s:%s\n",
+ dev->wakeup.flags.valid ? '*' : ' ',
+ (device_may_wakeup(&dev->dev) ||
+ device_may_wakeup(ldev)) ?
+ "enabled" : "disabled",
+ ldev->bus ? ldev->bus->name :
+ "no-bus", dev_name(ldev));
+ put_device(ldev);
+ }
+ }
+
+ mutex_unlock(&dev->physical_node_lock);
+ }
+ mutex_unlock(&acpi_device_lock);
+ return 0;
+}
+
+static void physical_device_enable_wakeup(struct acpi_device *adev)
+{
+ struct acpi_device_physical_node *entry;
+
+ mutex_lock(&adev->physical_node_lock);
+
+ list_for_each_entry(entry,
+ &adev->physical_node_list, node)
+ if (entry->dev && device_can_wakeup(entry->dev)) {
+ bool enable = !device_may_wakeup(entry->dev);
+ device_set_wakeup_enable(entry->dev, enable);
+ }
+
+ mutex_unlock(&adev->physical_node_lock);
+}
+
+static ssize_t
+acpi_system_write_wakeup_device(struct file *file,
+ const char __user * buffer,
+ size_t count, loff_t * ppos)
+{
+ struct list_head *node, *next;
+ char strbuf[5];
+ char str[5] = "";
+
+ if (count > 4)
+ count = 4;
+
+ if (copy_from_user(strbuf, buffer, count))
+ return -EFAULT;
+ strbuf[count] = '\0';
+ sscanf(strbuf, "%s", str);
+
+ mutex_lock(&acpi_device_lock);
+ list_for_each_safe(node, next, &acpi_wakeup_device_list) {
+ struct acpi_device *dev =
+ container_of(node, struct acpi_device, wakeup_list);
+ if (!dev->wakeup.flags.valid)
+ continue;
+
+ if (!strncmp(dev->pnp.bus_id, str, 4)) {
+ if (device_can_wakeup(&dev->dev)) {
+ bool enable = !device_may_wakeup(&dev->dev);
+ device_set_wakeup_enable(&dev->dev, enable);
+ } else {
+ physical_device_enable_wakeup(dev);
+ }
+ break;
+ }
+ }
+ mutex_unlock(&acpi_device_lock);
+ return count;
+}
+
+static int
+acpi_system_wakeup_device_open_fs(struct inode *inode, struct file *file)
+{
+ return single_open(file, acpi_system_wakeup_device_seq_show,
+ PDE_DATA(inode));
+}
+
+static const struct file_operations acpi_system_wakeup_device_fops = {
+ .owner = THIS_MODULE,
+ .open = acpi_system_wakeup_device_open_fs,
+ .read = seq_read,
+ .write = acpi_system_write_wakeup_device,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+void __init acpi_sleep_proc_init(void)
+{
+ /* 'wakeup device' [R/W] */
+ proc_create("wakeup", S_IFREG | S_IRUGO | S_IWUSR,
+ acpi_root_dir, &acpi_system_wakeup_device_fops);
+}