[PATCH v2 4/5] power: supply: core: add vendor and product id properties

[Amit Sunil Dhamne via B4 Relay <devnull+amitsd.google.com@kernel.org>]

From: Amit Sunil Dhamne <amitsd@google.com>

Add the following properties:
  * Vendor Identifier (VID): Assigned to the battery manufacturer by USB
    Implementers Forum (USB-IF).
  * Product Identifier (PID) assigned by the manufacturer to the
    battery.

This info is required by USB Type-C PD devices containing batteries.
This enables the USB Type C devices to respond to a Battery capacity
request from the port partner by querying for the PID & VID assigned to
the batteries. Refer to "USB Power Delivery Specification Rev3.1 v1.8"
Chapter 5.5 Battery_Capabilities Message.

Signed-off-by: Amit Sunil Dhamne <amitsd@google.com>
---
 Documentation/ABI/testing/sysfs-class-power | 19 +++++++++++++++----
 Documentation/power/power_supply_class.rst  | 11 +++++++++++
 drivers/power/supply/power_supply_sysfs.c   |  2 ++
 include/linux/power_supply.h                |  2 ++
 4 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-class-power b/Documentation/ABI/testing/sysfs-class-power
index 2a5c1a09a28f91beec6b18ca7b4492093026bc81..5495e82885b2294cdfd5ace0e7e5fcbeadfccb5f 100644
--- a/Documentation/ABI/testing/sysfs-class-power
+++ b/Documentation/ABI/testing/sysfs-class-power
@@ -814,11 +814,22 @@ Description:
 		Access: Read
 		Valid values: 1-31
 
-What:		/sys/class/power_supply/<supply_name>/extensions/<extension_name>
-Date:		March 2025
+What:		/sys/class/power_supply/<supply_name>/usbif_vendor_id
+Date:		May 2025
 Contact:	linux-pm@vger.kernel.org
 Description:
-		Reports the extensions registered to the power supply.
-		Each entry is a link to the device which registered the extension.
+		Reports the vendor id assigned to the battery manufacturer by USB
+		Implementers Forum (USB-IF).
 
 		Access: Read
+		Valid values: 0x0-0xffff
+
+What:		/sys/class/power_supply/<supply_name>/usbif_product_id
+Date:		May 2025
+Contact:	linux-pm@vger.kernel.org
+Description:
+		Reports the product id assigned to the battery by the manufacturer
+		(associated with usbif_vendor_id).
+
+		Access: Read
+		Valid values: 0x0-0xffff
diff --git a/Documentation/power/power_supply_class.rst b/Documentation/power/power_supply_class.rst
index da8e275a14ffb9f84bae9ae1efc4720a55ea3010..6d0a6bcf501e719fa4454845b583a8b38d371bb4 100644
--- a/Documentation/power/power_supply_class.rst
+++ b/Documentation/power/power_supply_class.rst
@@ -213,6 +213,17 @@ TIME_TO_FULL
   seconds left for battery to be considered full
   (i.e. while battery is charging)
 
+USBIF_VENDOR_ID
+  Vendor ID (VID) assigned to manufacturer or device vendor associated with the
+  battery by USB Implementers Forum (USB-IF). This property is described in
+  "USB Power Delivery Specification Rev3.1 V1.8" Chapter 6.5.5 Battery
+  Capabilities, Section 6.5.5.1 Vendor ID (VID).
+USBIF_PRODUCT_ID
+  Product ID (PID) assigned to the battery, such that if the VID belongs to the
+  manufacturer then the PID will be designated by it. Similarly if the VID
+  belongs to the device vendor then the PID will be designated by it. This
+  property is described in "USB Power Delivery Specification Rev3.1 V1.8"
+  Chapter 6.5.5 Battery Capabilities, Section 6.5.5.2 Product ID (PID).
 
 Battery <-> external power supply interaction
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/drivers/power/supply/power_supply_sysfs.c b/drivers/power/supply/power_supply_sysfs.c
index edb058c19c9c44ad9ad97a626fc8f59e3d3735a6..534ed3cd049866fa747455bb6dae1ec2dc5e2da6 100644
--- a/drivers/power/supply/power_supply_sysfs.c
+++ b/drivers/power/supply/power_supply_sysfs.c
@@ -211,6 +211,8 @@ static struct power_supply_attr power_supply_attrs[] __ro_after_init = {
 	POWER_SUPPLY_ATTR(TIME_TO_EMPTY_AVG),
 	POWER_SUPPLY_ATTR(TIME_TO_FULL_NOW),
 	POWER_SUPPLY_ATTR(TIME_TO_FULL_AVG),
+	POWER_SUPPLY_ATTR(USBIF_VENDOR_ID),
+	POWER_SUPPLY_ATTR(USBIF_PRODUCT_ID),
 	POWER_SUPPLY_ENUM_ATTR(TYPE),
 	POWER_SUPPLY_ENUM_ATTR(USB_TYPE),
 	POWER_SUPPLY_ENUM_ATTR(SCOPE),
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index a35b08bd368e9305554e1a608dc8e526983cfa12..100eb559dcede938595ffbf83bc5ef3645a5a172 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -165,6 +165,8 @@ enum power_supply_property {
 	POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 	POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 	POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
+	POWER_SUPPLY_PROP_USBIF_VENDOR_ID,
+	POWER_SUPPLY_PROP_USBIF_PRODUCT_ID,
 	POWER_SUPPLY_PROP_TYPE, /* use power_supply.type instead */
 	POWER_SUPPLY_PROP_USB_TYPE,
 	POWER_SUPPLY_PROP_SCOPE,

-- 
2.49.0.987.g0cc8ee98dc-goog