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firmware: dmi_scan: add SBMIOS entry and DMI tables

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Some utils, like dmidecode and smbios, need to access SMBIOS entry
table area in order to get information like SMBIOS version, size, etc.
Currently it's done via /dev/mem. But for situation when /dev/mem
usage is disabled, the utils have to use dmi sysfs instead, which
doesn't represent SMBIOS entry and adds code/delay redundancy when direct
access for table is needed.

So this patch creates dmi/tables and adds SMBIOS entry point to allow
utils in question to work correctly without /dev/mem. Also patch adds
raw dmi table to simplify dmi table processing in user space, as
proposed by Jean Delvare.

Tested-by: Roy Franz <roy.franz@linaro.org>
Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@globallogic.com>
Signed-off-by: Jean Delvare <jdelvare@suse.de>
This commit is contained in:
Ivan Khoronzhuk
2015-06-25 09:06:56 +02:00
committed by Jean Delvare
parent 6e0ad59e3d
commit d7f96f97c4
5 changed files with 111 additions and 9 deletions
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17
drivers/firmware/dmi-sysfs.c
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@@ -566,7 +566,6 @@ static struct kobj_type dmi_sysfs_entry_ktype = {
.default_attrs = dmi_sysfs_entry_attrs,
};
static struct kobject *dmi_kobj;
static struct kset *dmi_kset;
/* Global count of all instances seen. Only for setup */
@@ -648,17 +647,20 @@ static void cleanup_entry_list(void)
static int __init dmi_sysfs_init(void)
{
int error = -ENOMEM;
int error;
int val;
/* Set up our directory */
dmi_kobj = kobject_create_and_add("dmi", firmware_kobj);
if (!dmi_kobj)
if (!dmi_kobj) {
pr_err("dmi-sysfs: dmi entry is absent.\n");
error = -ENODATA;
goto err;
}
dmi_kset = kset_create_and_add("entries", NULL, dmi_kobj);
if (!dmi_kset)
if (!dmi_kset) {
error = -ENOMEM;
goto err;
}
val = 0;
error = dmi_walk(dmi_sysfs_register_handle, &val);
@@ -675,7 +677,6 @@ static int __init dmi_sysfs_init(void)
err:
cleanup_entry_list();
kset_unregister(dmi_kset);
kobject_put(dmi_kobj);
return error;
}
@@ -685,8 +686,6 @@ static void __exit dmi_sysfs_exit(void)
pr_debug("dmi-sysfs: unloading.\n");
cleanup_entry_list();
kset_unregister(dmi_kset);
kobject_del(dmi_kobj);
kobject_put(dmi_kobj);
}
module_init(dmi_sysfs_init);