[PATCH 2/3] firmware/dmi: Report DMI Bios release

[Erwan Velu]

Some vendors like HPe or Dell, encodes the release version of their BIOS
in the "System BIOS {Major|Minor} Release" fields of Type 0.

This information is useful to know which release of the bios is actually running.
It could be used for some quirks, debugging sessions or inventory tasks.

This patch extract these 2 fields in DMI_BIOS_MAJOR_RELEASE & DMI_BIOS_MINOR_RELEASE.

A typical output for a Dell system running the 65.27 bios is :

	[root@t1700 ~]# cat /sys/devices/virtual/dmi/id/bios_release_major
	65
	[root@t1700 ~]# cat /sys/devices/virtual/dmi/id/bios_release_minor
	27
	[root@t1700 ~]#

Signed-off-by: Erwan Velu <e.velu@xxxxxxxxxx>
---
 drivers/firmware/dmi-id.c       | 6 ++++++
 drivers/firmware/dmi_scan.c     | 2 ++
 include/linux/mod_devicetable.h | 2 ++
 scripts/mod/file2alias.c        | 2 ++
 4 files changed, 12 insertions(+)

diff --git a/drivers/firmware/dmi-id.c b/drivers/firmware/dmi-id.c
index ff39f64f2aae..3248c2837a4d 100644
--- a/drivers/firmware/dmi-id.c
+++ b/drivers/firmware/dmi-id.c
@@ -42,6 +42,8 @@ DEFINE_DMI_ATTR_WITH_SHOW(bios_vendor,		0444, DMI_BIOS_VENDOR);
 DEFINE_DMI_ATTR_WITH_SHOW(bios_version,		0444, DMI_BIOS_VERSION);
 DEFINE_DMI_ATTR_WITH_SHOW(bios_date,		0444, DMI_BIOS_DATE);
 DEFINE_DMI_ATTR_WITH_SHOW(sys_vendor,		0444, DMI_SYS_VENDOR);
+DEFINE_DMI_ATTR_WITH_SHOW(bios_release_major, 0444, DMI_BIOS_MAJOR_RELEASE);
+DEFINE_DMI_ATTR_WITH_SHOW(bios_release_minor, 0444, DMI_BIOS_MINOR_RELEASE);
 DEFINE_DMI_ATTR_WITH_SHOW(product_name,		0444, DMI_PRODUCT_NAME);
 DEFINE_DMI_ATTR_WITH_SHOW(product_version,	0444, DMI_PRODUCT_VERSION);
 DEFINE_DMI_ATTR_WITH_SHOW(product_serial,	0400, DMI_PRODUCT_SERIAL);
@@ -78,6 +80,8 @@ static ssize_t get_modalias(char *buffer, size_t buffer_size)
 		{ "bvn", DMI_BIOS_VENDOR },
 		{ "bvr", DMI_BIOS_VERSION },
 		{ "bd",  DMI_BIOS_DATE },
+		{ "bjr", DMI_BIOS_MAJOR_RELEASE },
+		{ "bmr", DMI_BIOS_MINOR_RELEASE },
 		{ "svn", DMI_SYS_VENDOR },
 		{ "pn",  DMI_PRODUCT_NAME },
 		{ "pvr", DMI_PRODUCT_VERSION },
@@ -187,6 +191,8 @@ static void __init dmi_id_init_attr_table(void)
 	ADD_DMI_ATTR(bios_vendor,       DMI_BIOS_VENDOR);
 	ADD_DMI_ATTR(bios_version,      DMI_BIOS_VERSION);
 	ADD_DMI_ATTR(bios_date,         DMI_BIOS_DATE);
+	ADD_DMI_ATTR(bios_release_major, DMI_BIOS_MAJOR_RELEASE);
+	ADD_DMI_ATTR(bios_release_minor, DMI_BIOS_MINOR_RELEASE);
 	ADD_DMI_ATTR(sys_vendor,        DMI_SYS_VENDOR);
 	ADD_DMI_ATTR(product_name,      DMI_PRODUCT_NAME);
 	ADD_DMI_ATTR(product_version,   DMI_PRODUCT_VERSION);
diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index 202bd2c69d0f..886ace54e527 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -464,6 +464,8 @@ static void __init dmi_decode(const struct dmi_header *dm, void *dummy)
 		dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
 		dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
 		dmi_save_ident(dm, DMI_BIOS_DATE, 8);
+		dmi_save_release(dm, DMI_BIOS_MAJOR_RELEASE, 20);
+		dmi_save_release(dm, DMI_BIOS_MINOR_RELEASE, 21);
 		break;
 	case 1:		/* System Information */
 		dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index 5714fd35a83c..2471de601bd6 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -532,6 +532,8 @@ enum dmi_field {
 	DMI_BIOS_VENDOR,
 	DMI_BIOS_VERSION,
 	DMI_BIOS_DATE,
+	DMI_BIOS_MAJOR_RELEASE,
+	DMI_BIOS_MINOR_RELEASE,
 	DMI_SYS_VENDOR,
 	DMI_PRODUCT_NAME,
 	DMI_PRODUCT_VERSION,
diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index e17a29ae2e97..1b4f9bc3b06c 100644
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -931,6 +931,8 @@ static const struct dmifield {
 	{ "bvn", DMI_BIOS_VENDOR },
 	{ "bvr", DMI_BIOS_VERSION },
 	{ "bd",  DMI_BIOS_DATE },
+	{ "bjr", DMI_BIOS_MAJOR_RELEASE },
+	{ "bmr", DMI_BIOS_MINOR_RELEASE },
 	{ "svn", DMI_SYS_VENDOR },
 	{ "pn",  DMI_PRODUCT_NAME },
 	{ "pvr", DMI_PRODUCT_VERSION },
-- 
2.21.0