[PATCH 0/6] power: supply: Change usb_types from an array into a bitmask

Wed Sep 4 02:26:40 PDT 2024

Hi,

On 9/4/24 12:04 AM, Sebastian Reichel wrote:
> Hi,
> 
> On Sat, Aug 31, 2024 at 04:20:33PM GMT, Hans de Goede wrote:
>> When support for the "charge_behaviour" property was added the list of
>> available values was made a bitmask in power_supply_desc.
>>
>> "usb_types" is very similar in that:
>> 1. It is an enum
>> 2. The list of available values is stored in power_supply_desc
>> 3. When shown it shows all available values, with the active one surrounded
>>    by square brackets.
>>
>> But "usb_types" uses an array with valid enum values instead of a bitmask.
>> This uses more memory then the bitmap approach and it makes it impossible
>> to have a shared generic show() function for properties which show
>> available values, with the active one surrounded by square brackets.
>>
>> This patch-set moves "usb_types" over to a bitmask in power_supply_desc
>> to indicate the available values.
>>
>> Patches 1 - 3:
>>
>> It turns out that the ucs1002-power driver contained a surprise in that
>> it supports writing to "usb_type" even though the ABI doc says it is
>> read-only. Since we cannot break shipped userspace API, the ship has sailed
>> on this one. The first patch documents that writing "usb_type" is allowed,
>> but only for power-supply devices which provide USB power rather then
>> consume it.
>>
>> Enum properties accept writing the FOO_TEXT[] string values, passing
>> the enum value matching the FOO_TEXT entry to set_property(), the second
>> patch adjusts ucs1002_set_usb_type() to directly accept enum values.
>>
>> The rt9467 driver was another driver which allowed writing to "usb_type"
>> but there the use made no sense, so it is simply dropped.
>>
>> Patches 4 - 6:
>>
>> These patches implement the actual moving of usb_types to a bitmask.
>>
>> Patch 6 is a bit of a bigbang patch moving all drivers over in one go,
>> touching a couple of drivers outside drivers/power/supply: 1 in
>> drivers/extcon/ 1 in drivers/phy/ and 5 in drivers/usb/typec/ since
>> the changes outside of drivers/power/supply are small I've chosen to
>> make all the changes in one go rather then have some sort of
>> intermediate state where both ways are supported.
>>
>> For merging this I believe it would be best for an immutable branch / tag
>> to be created on the linux-power-supply tree and then send a pull-request
>> to the extcon, phy and usb-typec maintainers to merge the tag.
>>
>> extcon, phy and typec maintainers can you please give your Acked-by for
>> patch 6/6 for merging these changes through the linux-power-supply tree?
>>
>> This set is based on top of the latest linux-power-supply/for-next.
> 
> As we are quite close before the merge window I just took it with
> just the Ack from Greg. The changes in PHY and Extcon are quite
> small.

Great, thank you.

Regards,

Hans

> I did prepare an immutable branch in case it is needed by
> any of the other involved trees:
> 
> The following changes since commit 8400291e289ee6b2bf9779ff1c83a291501f017b:
> 
>   Linux 6.11-rc1 (2024-07-28 14:19:55 -0700)
> 
> are available in the Git repository at:
> 
>   https://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply.git tags/ib-psy-usb-types-signed
> 
> for you to fetch changes up to 364ea7ccaef917a3068236a19a4b31a0623b561a:
> 
>   power: supply: Change usb_types from an array into a bitmask (2024-09-03 23:20:28 +0200)
> 
> ----------------------------------------------------------------
> Immutable branch for usb_types change for v6.12
> 
> Changing usb_types type from array to bitmap in the power_supply_desc
> struct requires updating power-supply drivers living in different
> subsystem, so it is handled via an immutable branch.
> 
> ----------------------------------------------------------------
> Hans de Goede (6):
>       power: supply: "usb_type" property may be written to
>       power: supply: ucs1002: Adjust ucs1002_set_usb_type() to accept string values
>       power: supply: rt9467-charger: Remove "usb_type" property write support
>       power: supply: sysfs: Add power_supply_show_enum_with_available() helper
>       power: supply: sysfs: Move power_supply_show_enum_with_available() up
>       power: supply: Change usb_types from an array into a bitmask
> 
>  Documentation/ABI/testing/sysfs-class-power     |  7 ++-
>  drivers/extcon/extcon-intel-cht-wc.c            | 15 ++----
>  drivers/phy/ti/phy-tusb1210.c                   | 11 ++---
>  drivers/power/supply/axp20x_usb_power.c         | 13 ++---
>  drivers/power/supply/bq256xx_charger.c          | 15 ++----
>  drivers/power/supply/cros_usbpd-charger.c       | 22 +++------
>  drivers/power/supply/lenovo_yoga_c630_battery.c |  7 +--
>  drivers/power/supply/mp2629_charger.c           | 15 ++----
>  drivers/power/supply/mt6360_charger.c           | 13 ++---
>  drivers/power/supply/mt6370-charger.c           | 13 ++---
>  drivers/power/supply/power_supply_core.c        |  4 --
>  drivers/power/supply/power_supply_sysfs.c       | 66 ++++++++-----------------
>  drivers/power/supply/qcom_battmgr.c             | 37 +++++++-------
>  drivers/power/supply/qcom_pmi8998_charger.c     | 13 ++---
>  drivers/power/supply/rk817_charger.c            |  9 +---
>  drivers/power/supply/rn5t618_power.c            | 13 ++---
>  drivers/power/supply/rt9467-charger.c           | 16 ++----
>  drivers/power/supply/rt9471.c                   | 15 ++----
>  drivers/power/supply/ucs1002_power.c            | 26 +++++-----
>  drivers/usb/typec/anx7411.c                     | 11 ++---
>  drivers/usb/typec/rt1719.c                      | 11 ++---
>  drivers/usb/typec/tcpm/tcpm.c                   | 11 ++---
>  drivers/usb/typec/tipd/core.c                   |  9 +---
>  drivers/usb/typec/ucsi/psy.c                    | 11 ++---
>  include/linux/power_supply.h                    |  3 +-
>  25 files changed, 132 insertions(+), 254 deletions(-)
> 
> -- Sebastian