[PATCH 2/2] firmware/dmi: Report DMI Embedded Firmware release

[Erwan Velu <erwanaliasr1@gmail.com>]

Servers that have a BMC encodes the release version of their firmwarein the
 "Embedded Controller Firmware {Major|Minor} Release" fields of Type 0.

This information is used to know which BMC release actually runs.
It could be used for some quirks, debugging sessions or inventory tasks.

A typical output for a Dell system running the 3.75 bios is :

    [root@t1700 ~]# cat /sys/devices/virtual/dmi/id/fw_release
    3.75
    [root@t1700 ~]#

Signed-off-by: Erwan Velu <e.velu@criteo.com>
---
 drivers/firmware/dmi-id.c       | 3 +++
 drivers/firmware/dmi_scan.c     | 1 +
 include/linux/mod_devicetable.h | 1 +
 scripts/mod/file2alias.c        | 1 +
 4 files changed, 6 insertions(+)

diff --git a/drivers/firmware/dmi-id.c b/drivers/firmware/dmi-id.c
index a2aac65ff771..93eca3222fb0 100644
--- a/drivers/firmware/dmi-id.c
+++ b/drivers/firmware/dmi-id.c
@@ -43,6 +43,7 @@ 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,         0444, DMI_BIOS_RELEASE);
+DEFINE_DMI_ATTR_WITH_SHOW(fw_release,           0444, DMI_EMBEDDED_FW_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);
@@ -80,6 +81,7 @@ static ssize_t get_modalias(char *buffer, size_t buffer_size)
 		{ "bvr", DMI_BIOS_VERSION },
 		{ "bd",  DMI_BIOS_DATE },
 		{ "br",  DMI_BIOS_RELEASE },
+		{ "efr", DMI_EMBEDDED_FW_RELEASE },
 		{ "svn", DMI_SYS_VENDOR },
 		{ "pn",  DMI_PRODUCT_NAME },
 		{ "pvr", DMI_PRODUCT_VERSION },
@@ -190,6 +192,7 @@ static void __init dmi_id_init_attr_table(void)
 	ADD_DMI_ATTR(bios_version,      DMI_BIOS_VERSION);
 	ADD_DMI_ATTR(bios_date,         DMI_BIOS_DATE);
 	ADD_DMI_ATTR(bios_release,      DMI_BIOS_RELEASE);
+	ADD_DMI_ATTR(fw_release,        DMI_EMBEDDED_FW_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 d010c915c1ab..5394aa553140 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -467,6 +467,7 @@ static void __init dmi_decode(const struct dmi_header *dm, void *dummy)
 		dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
 		dmi_save_ident(dm, DMI_BIOS_DATE, 8);
 		dmi_save_release(dm, DMI_BIOS_RELEASE, 21);
+		dmi_save_release(dm, DMI_EMBEDDED_FW_RELEASE, 23);
 		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 618933d770e6..ad64a101676d 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -533,6 +533,7 @@ enum dmi_field {
 	DMI_BIOS_VERSION,
 	DMI_BIOS_DATE,
 	DMI_BIOS_RELEASE,
+	DMI_EMBEDDED_FW_RELEASE,
 	DMI_SYS_VENDOR,
 	DMI_PRODUCT_NAME,
 	DMI_PRODUCT_VERSION,
diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index cc48930cc02a..c0e1d379d9df 100644
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -937,6 +937,7 @@ static const struct dmifield {
 	{ "bvr", DMI_BIOS_VERSION },
 	{ "bd",  DMI_BIOS_DATE },
 	{ "br",  DMI_BIOS_RELEASE },
+	{ "efr", DMI_EMBEDDED_FW_RELEASE },
 	{ "svn", DMI_SYS_VENDOR },
 	{ "pn",  DMI_PRODUCT_NAME },
 	{ "pvr", DMI_PRODUCT_VERSION },
-- 
2.23.0