diff mbox series

[1/6] power: supply: "usb_type" property may be written to

Message ID 20240831142039.28830-2-hdegoede@redhat.com
State Accepted
Commit 0d9af1e1c93b6a89f3fb6dcbafa5bc78892cb94f
Headers show
Series power: supply: Change usb_types from an array into a bitmask | expand

Commit Message

Hans de Goede Aug. 31, 2024, 2:20 p.m. UTC
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@collabora.com>
Cc: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 Documentation/ABI/testing/sysfs-class-power | 7 ++++++-
 drivers/power/supply/power_supply_sysfs.c   | 2 +-
 2 files changed, 7 insertions(+), 2 deletions(-)

Comments

Greg KH Sept. 3, 2024, 7:04 a.m. UTC | #1
On Sat, Aug 31, 2024 at 04:20:34PM +0200, Hans de Goede wrote:
> 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.

Ick, crazy hardware :(

> 
> 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@collabora.com>
> Cc: Andrey Smirnov <andrew.smirnov@gmail.com>
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff mbox series

Patch

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),