linux-kernel - [PATCH 1/6] power: supply: "usb_type" property may be written to

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Message-ID: <20240831142039.28830-2-hdegoede@redhat.com>
Date: Sat, 31 Aug 2024 16:20:34 +0200
From: Hans de Goede <hdegoede@...hat.com>
To: Sebastian Reichel <sre@...nel.org>,
	Thomas Weißschuh <linux@...ssschuh.net>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>
Cc: Hans de Goede <hdegoede@...hat.com>,
	Enric Balletbo Serra <enric.balletbo@...labora.com>,
	Andrey Smirnov <andrew.smirnov@...il.com>,
	linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org,
	linux-phy@...ts.infradead.org
Subject: [PATCH 1/6] power: supply: "usb_type" property may be written to

According to Documentation/ABI/testing/sysfs-class-power the "usb_type"
property is Read-Only.

For power-supplies which consume USB power such as battery charger chips,
this is correct.

But the UCS1002 USB Port Power Controller driver which is a driver
for a chip which is a power-source for USB-A charging ports "usb_type"
is actually writable to configure the type of USB charger emulated
by the USB-A port.

Adjust the docs and the power_supply_sysfs.c code to adjust for this
new writeable use of "usb_type":

1. Update Documentation/ABI/testing/sysfs-class-power to document that
"usb_type" may be writable

2. Change the power_supply_attr type in power_supply_sysfs.c from
POWER_SUPPLY_ATTR() into POWER_SUPPLY_ENUM_ATTR() so that the various
usb_type string values from POWER_SUPPLY_TYPE_TEXT[] such as e.g.
"SDP" and "USB_PD" can be written to the "usb_type" attribute instead
of only accepting integer values.

Cc: Enric Balletbo Serra <enric.balletbo@...labora.com>
Cc: Andrey Smirnov <andrew.smirnov@...il.com>
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
---
 Documentation/ABI/testing/sysfs-class-power | 7 ++++++-
 drivers/power/supply/power_supply_sysfs.c   | 2 +-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-class-power b/Documentation/ABI/testing/sysfs-class-power
index 84973f66b42c..45180b62d426 100644
--- a/Documentation/ABI/testing/sysfs-class-power
+++ b/Documentation/ABI/testing/sysfs-class-power
@@ -608,7 +608,12 @@ Description:
 		the supply, for example it can show if USB-PD capable source
 		is attached.
 
-		Access: Read-Only
+		Access: For power-supplies which consume USB power such
+		as battery charger chips, this indicates the type of
+		the connected USB power source and is Read-Only.
+
+		For power-supplies which act as a USB power-source such as
+		e.g. the UCS1002 USB Port Power Controller this is writable.
 
 		Valid values:
 			      "Unknown", "SDP", "DCP", "CDP", "ACA", "C", "PD",
diff --git a/drivers/power/supply/power_supply_sysfs.c b/drivers/power/supply/power_supply_sysfs.c
index 3e63d165b2f7..ff7e423edd57 100644
--- a/drivers/power/supply/power_supply_sysfs.c
+++ b/drivers/power/supply/power_supply_sysfs.c
@@ -209,7 +209,7 @@ static struct power_supply_attr power_supply_attrs[] = {
 	POWER_SUPPLY_ATTR(TIME_TO_FULL_NOW),
 	POWER_SUPPLY_ATTR(TIME_TO_FULL_AVG),
 	POWER_SUPPLY_ENUM_ATTR(TYPE),
-	POWER_SUPPLY_ATTR(USB_TYPE),
+	POWER_SUPPLY_ENUM_ATTR(USB_TYPE),
 	POWER_SUPPLY_ENUM_ATTR(SCOPE),
 	POWER_SUPPLY_ATTR(PRECHARGE_CURRENT),
 	POWER_SUPPLY_ATTR(CHARGE_TERM_CURRENT),
-- 
2.46.0