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// 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"
/*
* this file provides support for:
* /proc/acpi/wakeup
*/
static int
acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
{
struct acpi_device *dev, *tmp;
seq_printf(seq, "Device\tS-state\t Status Sysfs node\n");
mutex_lock(&acpi_device_lock);
list_for_each_entry_safe(dev, tmp, &acpi_wakeup_device_list,
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 acpi_device *dev, *tmp;
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_entry_safe(dev, tmp, &acpi_wakeup_device_list,
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 proc_ops acpi_system_wakeup_device_proc_ops = {
.proc_open = acpi_system_wakeup_device_open_fs,
.proc_read = seq_read,
.proc_write = acpi_system_write_wakeup_device,
.proc_lseek = seq_lseek,
.proc_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_proc_ops);
}
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