| 1 | |
| 2 | |
| 3 | * memconsole.c
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| 4 | *
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| 5 | * Architecture-independent parts of the memory based BIOS console.
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| 6 | *
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| 7 | * Copyright 2017 Google Inc.
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| 8 |
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| 9 |
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| 10 | #include <linux/sysfs.h>
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| 11 | #include <linux/kobject.h>
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| 12 | #include <linux/module.h>
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| 13 |
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| 14 | #include "memconsole.h"
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| 15 |
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| 16 | static ssize_t memconsole_read(struct file *filp, struct kobject *kobp,
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| 17 | const struct bin_attribute *bin_attr, char *buf,
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| 18 | loff_t pos, size_t count)
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| 19 | {
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| 20 | ssize_t (*memconsole_read_func)(char *, loff_t, size_t);
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| 21 |
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| 22 | memconsole_read_func = bin_attr->private;
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| 23 | if (WARN_ON_ONCE(!memconsole_read_func))
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| 24 | return -EIO;
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| 25 |
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| 26 | return memconsole_read_func(buf, pos, count);
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| 27 | }
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| 28 |
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| 29 | static struct bin_attribute memconsole_bin_attr = {
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| 30 | .attr = {.name = "log", .mode = 0444},
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| 31 | .read = memconsole_read,
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| 32 | };
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| 33 |
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| 34 | void memconsole_setup(ssize_t (*read_func)(char *, loff_t, size_t))
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| 35 | {
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| 36 | memconsole_bin_attr.private = read_func;
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| 37 | }
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| 38 | EXPORT_SYMBOL(memconsole_setup);
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| 39 |
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| 40 | int memconsole_sysfs_init(void)
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| 41 | {
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| 42 | return sysfs_create_bin_file(firmware_kobj, &memconsole_bin_attr);
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| 43 | }
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| 44 | EXPORT_SYMBOL(memconsole_sysfs_init);
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| 45 |
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| 46 | void memconsole_exit(void)
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| 47 | {
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| 48 | sysfs_remove_bin_file(firmware_kobj, &memconsole_bin_attr);
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| 49 | }
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| 50 | EXPORT_SYMBOL(memconsole_exit);
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| 51 |
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| 52 | MODULE_AUTHOR("Google, Inc.");
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| 53 | MODULE_DESCRIPTION("Architecture-independent parts of the memory based BIOS console");
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| 54 | MODULE_LICENSE("GPL");
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