github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-06-05 21:15:53 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

power: supply: "usb_type" property may be written to

Browse Source 
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>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20240831142039.28830-2-hdegoede@redhat.com
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Hans de Goede 2024-08-31 16:20:34 +02:00 committed by Sebastian Reichel
parent 8400291e28
commit 0d9af1e1c9
2 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
Documentation/ABI/testing/sysfs-class-power
View File

@ -592,7 +592,12 @@ 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",

2
drivers/power/supply/power_supply_sysfs.c
View File

@ -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),