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- // 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");
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