mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 13:46:39 +07:00
f52fd66d2e
cosmetic only Make "module name" actually match the file name. Invoke with ';' as leaving it off confuses Lindent and gcc doesn't care. Fix indentation where Lindent did get confused. Signed-off-by: Len Brown <len.brown@intel.com>
129 lines
2.8 KiB
C
129 lines
2.8 KiB
C
/*
|
|
* event.c - exporting ACPI events via procfs
|
|
*
|
|
* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
|
|
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
|
|
*
|
|
*/
|
|
|
|
#include <linux/spinlock.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/init.h>
|
|
#include <linux/poll.h>
|
|
#include <acpi/acpi_drivers.h>
|
|
|
|
#define _COMPONENT ACPI_SYSTEM_COMPONENT
|
|
ACPI_MODULE_NAME("event");
|
|
|
|
/* Global vars for handling event proc entry */
|
|
static DEFINE_SPINLOCK(acpi_system_event_lock);
|
|
int event_is_open = 0;
|
|
extern struct list_head acpi_bus_event_list;
|
|
extern wait_queue_head_t acpi_bus_event_queue;
|
|
|
|
static int acpi_system_open_event(struct inode *inode, struct file *file)
|
|
{
|
|
spin_lock_irq(&acpi_system_event_lock);
|
|
|
|
if (event_is_open)
|
|
goto out_busy;
|
|
|
|
event_is_open = 1;
|
|
|
|
spin_unlock_irq(&acpi_system_event_lock);
|
|
return 0;
|
|
|
|
out_busy:
|
|
spin_unlock_irq(&acpi_system_event_lock);
|
|
return -EBUSY;
|
|
}
|
|
|
|
static ssize_t
|
|
acpi_system_read_event(struct file *file, char __user * buffer, size_t count,
|
|
loff_t * ppos)
|
|
{
|
|
int result = 0;
|
|
struct acpi_bus_event event;
|
|
static char str[ACPI_MAX_STRING];
|
|
static int chars_remaining = 0;
|
|
static char *ptr;
|
|
|
|
|
|
if (!chars_remaining) {
|
|
memset(&event, 0, sizeof(struct acpi_bus_event));
|
|
|
|
if ((file->f_flags & O_NONBLOCK)
|
|
&& (list_empty(&acpi_bus_event_list)))
|
|
return -EAGAIN;
|
|
|
|
result = acpi_bus_receive_event(&event);
|
|
if (result)
|
|
return result;
|
|
|
|
chars_remaining = sprintf(str, "%s %s %08x %08x\n",
|
|
event.device_class ? event.
|
|
device_class : "<unknown>",
|
|
event.bus_id ? event.
|
|
bus_id : "<unknown>", event.type,
|
|
event.data);
|
|
ptr = str;
|
|
}
|
|
|
|
if (chars_remaining < count) {
|
|
count = chars_remaining;
|
|
}
|
|
|
|
if (copy_to_user(buffer, ptr, count))
|
|
return -EFAULT;
|
|
|
|
*ppos += count;
|
|
chars_remaining -= count;
|
|
ptr += count;
|
|
|
|
return count;
|
|
}
|
|
|
|
static int acpi_system_close_event(struct inode *inode, struct file *file)
|
|
{
|
|
spin_lock_irq(&acpi_system_event_lock);
|
|
event_is_open = 0;
|
|
spin_unlock_irq(&acpi_system_event_lock);
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int acpi_system_poll_event(struct file *file, poll_table * wait)
|
|
{
|
|
poll_wait(file, &acpi_bus_event_queue, wait);
|
|
if (!list_empty(&acpi_bus_event_list))
|
|
return POLLIN | POLLRDNORM;
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations acpi_system_event_ops = {
|
|
.open = acpi_system_open_event,
|
|
.read = acpi_system_read_event,
|
|
.release = acpi_system_close_event,
|
|
.poll = acpi_system_poll_event,
|
|
};
|
|
|
|
static int __init acpi_event_init(void)
|
|
{
|
|
struct proc_dir_entry *entry;
|
|
int error = 0;
|
|
|
|
|
|
if (acpi_disabled)
|
|
return 0;
|
|
|
|
/* 'event' [R] */
|
|
entry = create_proc_entry("event", S_IRUSR, acpi_root_dir);
|
|
if (entry)
|
|
entry->proc_fops = &acpi_system_event_ops;
|
|
else {
|
|
error = -ENODEV;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
subsys_initcall(acpi_event_init);
|