/*
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* memconsole.c
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*
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* Architecture-independent parts of the memory based BIOS console.
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*
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* Copyright 2017 Google Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License v2.0 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/init.h>
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#include <linux/sysfs.h>
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#include <linux/kobject.h>
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#include <linux/module.h>
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#include "memconsole.h"
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static ssize_t (*memconsole_read_func)(char *, loff_t, size_t);
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static ssize_t memconsole_read(struct file *filp, struct kobject *kobp,
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struct bin_attribute *bin_attr, char *buf,
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loff_t pos, size_t count)
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{
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if (WARN_ON_ONCE(!memconsole_read_func))
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return -EIO;
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return memconsole_read_func(buf, pos, count);
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}
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static struct bin_attribute memconsole_bin_attr = {
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.attr = {.name = "log", .mode = 0444},
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.read = memconsole_read,
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};
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void memconsole_setup(ssize_t (*read_func)(char *, loff_t, size_t))
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{
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memconsole_read_func = read_func;
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}
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EXPORT_SYMBOL(memconsole_setup);
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int memconsole_sysfs_init(void)
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{
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return sysfs_create_bin_file(firmware_kobj, &memconsole_bin_attr);
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}
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EXPORT_SYMBOL(memconsole_sysfs_init);
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void memconsole_exit(void)
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{
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sysfs_remove_bin_file(firmware_kobj, &memconsole_bin_attr);
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}
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EXPORT_SYMBOL(memconsole_exit);
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MODULE_AUTHOR("Google, Inc.");
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MODULE_LICENSE("GPL");
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