54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-only
|
||
|
|
/*
|
||
|
|
* memconsole.c
|
||
|
|
*
|
||
|
|
* Architecture-independent parts of the memory based BIOS console.
|
||
|
|
*
|
||
|
|
* Copyright 2017 Google Inc.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/sysfs.h>
|
||
|
|
#include <linux/kobject.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
|
||
|
|
#include "memconsole.h"
|
||
|
|
|
||
|
|
static ssize_t memconsole_read(struct file *filp, struct kobject *kobp,
|
||
|
|
struct bin_attribute *bin_attr, char *buf,
|
||
|
|
loff_t pos, size_t count)
|
||
|
|
{
|
||
|
|
ssize_t (*memconsole_read_func)(char *, loff_t, size_t);
|
||
|
|
|
||
|
|
memconsole_read_func = bin_attr->private;
|
||
|
|
if (WARN_ON_ONCE(!memconsole_read_func))
|
||
|
|
return -EIO;
|
||
|
|
|
||
|
|
return memconsole_read_func(buf, pos, count);
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct bin_attribute memconsole_bin_attr = {
|
||
|
|
.attr = {.name = "log", .mode = 0444},
|
||
|
|
.read = memconsole_read,
|
||
|
|
};
|
||
|
|
|
||
|
|
void memconsole_setup(ssize_t (*read_func)(char *, loff_t, size_t))
|
||
|
|
{
|
||
|
|
memconsole_bin_attr.private = read_func;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(memconsole_setup);
|
||
|
|
|
||
|
|
int memconsole_sysfs_init(void)
|
||
|
|
{
|
||
|
|
return sysfs_create_bin_file(firmware_kobj, &memconsole_bin_attr);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(memconsole_sysfs_init);
|
||
|
|
|
||
|
|
void memconsole_exit(void)
|
||
|
|
{
|
||
|
|
sysfs_remove_bin_file(firmware_kobj, &memconsole_bin_attr);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(memconsole_exit);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Google, Inc.");
|
||
|
|
MODULE_LICENSE("GPL");
|