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07761a4cd4
Replace list_for_each_safe() and open-coded list entry address computations with list_for_each_entry_safe() in several places to simplify code. Signed-off-by: chenqiwu <chenqiwu@xiaomi.com> [ rjw: Subject & changelog ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
151 lines
3.5 KiB
C
151 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/export.h>
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#include <linux/suspend.h>
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#include <linux/bcd.h>
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#include <linux/acpi.h>
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#include <linux/uaccess.h>
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#include "sleep.h"
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#include "internal.h"
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#define _COMPONENT ACPI_SYSTEM_COMPONENT
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/*
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* this file provides support for:
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* /proc/acpi/wakeup
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*/
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ACPI_MODULE_NAME("sleep")
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static int
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acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
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{
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struct acpi_device *dev, *tmp;
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seq_printf(seq, "Device\tS-state\t Status Sysfs node\n");
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mutex_lock(&acpi_device_lock);
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list_for_each_entry_safe(dev, tmp, &acpi_wakeup_device_list,
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wakeup_list) {
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struct acpi_device_physical_node *entry;
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if (!dev->wakeup.flags.valid)
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continue;
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seq_printf(seq, "%s\t S%d\t",
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dev->pnp.bus_id,
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(u32) dev->wakeup.sleep_state);
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mutex_lock(&dev->physical_node_lock);
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if (!dev->physical_node_count) {
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seq_printf(seq, "%c%-8s\n",
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dev->wakeup.flags.valid ? '*' : ' ',
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device_may_wakeup(&dev->dev) ?
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"enabled" : "disabled");
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} else {
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struct device *ldev;
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list_for_each_entry(entry, &dev->physical_node_list,
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node) {
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ldev = get_device(entry->dev);
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if (!ldev)
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continue;
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if (&entry->node !=
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dev->physical_node_list.next)
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seq_printf(seq, "\t\t");
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seq_printf(seq, "%c%-8s %s:%s\n",
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dev->wakeup.flags.valid ? '*' : ' ',
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(device_may_wakeup(&dev->dev) ||
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device_may_wakeup(ldev)) ?
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"enabled" : "disabled",
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ldev->bus ? ldev->bus->name :
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"no-bus", dev_name(ldev));
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put_device(ldev);
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}
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}
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mutex_unlock(&dev->physical_node_lock);
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}
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mutex_unlock(&acpi_device_lock);
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return 0;
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}
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static void physical_device_enable_wakeup(struct acpi_device *adev)
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{
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struct acpi_device_physical_node *entry;
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mutex_lock(&adev->physical_node_lock);
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list_for_each_entry(entry,
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&adev->physical_node_list, node)
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if (entry->dev && device_can_wakeup(entry->dev)) {
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bool enable = !device_may_wakeup(entry->dev);
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device_set_wakeup_enable(entry->dev, enable);
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}
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mutex_unlock(&adev->physical_node_lock);
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}
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static ssize_t
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acpi_system_write_wakeup_device(struct file *file,
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const char __user * buffer,
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size_t count, loff_t * ppos)
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{
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struct acpi_device *dev, *tmp;
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char strbuf[5];
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char str[5] = "";
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if (count > 4)
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count = 4;
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if (copy_from_user(strbuf, buffer, count))
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return -EFAULT;
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strbuf[count] = '\0';
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sscanf(strbuf, "%s", str);
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mutex_lock(&acpi_device_lock);
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list_for_each_entry_safe(dev, tmp, &acpi_wakeup_device_list,
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wakeup_list) {
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if (!dev->wakeup.flags.valid)
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continue;
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if (!strncmp(dev->pnp.bus_id, str, 4)) {
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if (device_can_wakeup(&dev->dev)) {
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bool enable = !device_may_wakeup(&dev->dev);
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device_set_wakeup_enable(&dev->dev, enable);
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} else {
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physical_device_enable_wakeup(dev);
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}
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break;
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}
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}
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mutex_unlock(&acpi_device_lock);
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return count;
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}
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static int
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acpi_system_wakeup_device_open_fs(struct inode *inode, struct file *file)
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{
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return single_open(file, acpi_system_wakeup_device_seq_show,
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PDE_DATA(inode));
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}
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static const struct proc_ops acpi_system_wakeup_device_proc_ops = {
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.proc_open = acpi_system_wakeup_device_open_fs,
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.proc_read = seq_read,
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.proc_write = acpi_system_write_wakeup_device,
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.proc_lseek = seq_lseek,
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.proc_release = single_release,
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};
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void __init acpi_sleep_proc_init(void)
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{
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/* 'wakeup device' [R/W] */
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proc_create("wakeup", S_IFREG | S_IRUGO | S_IWUSR,
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acpi_root_dir, &acpi_system_wakeup_device_proc_ops);
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}
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