Re: [PATCH] HID: logitech-hidpp: BatteryVoltage: only read chargeStatus if extPower is active

[Benjamin Tissoires]

Hi,

On Mon, Jan 20, 2020 at 2:43 PM Pedro Vanzella <pedro@xxxxxxxxxxxxxxxxx> wrote:
>
> On 1/11/20 4:24 PM, Filipe LaÃns wrote:
> > In the HID++ 2.0 function getBatteryInfo() from the BatteryVoltage
> > (0x1001) feature, chargeStatus is only valid if extPower is active.
> >
> > Previously we were ignoring extPower, which resulted in wrong values.
>
> Nice catch. Sorry for missing that the first time around.
>
> >
> > Example:
> >      With an unplugged mouse
> >
> >      $ cat /sys/class/power_supply/hidpp_battery_0/status
> >      Charging
>
> Tested and it works as expected now.

Thanks for the patch and the tests.

Unfortunately, the merge window is already opened, and I'd rather not
sneak this one right now. This patch doesn't seem very critical so I
rather not annoy the other maintainers.
I'll make sure it gets in the 5.6 final by pushing it into a rc when
things are calmer for everybody.

So the plan would be:
- wait for the 'normal' 5.6 HID pull request to be sent
- apply this one in for-5.6/upstream-fixes
- sent this branch for either 5.6-rc1 or 5.6-rc2

Cheers,
Benjamin

>
> >
> > This patch makes fixes that, it also renames charge_sts to flags as
> > charge_sts can be confused with chargeStatus from the spec.
> >
> > Spec:
> > +--------+-------------------------------------------------------------------------+
> > |  byte  |                                    2                                    |
> > +--------+--------------+------------+------------+----------+----------+----------+
> > |   bit  |     0..2     |      3     |      4     |     5    |     6    |     7    |
> > +--------+--------------+------------+------------+----------+----------+----------+
> > | buffer | chargeStatus | fastCharge | slowCharge | critical | (unused) | extPower |
> > +--------+--------------+------------+------------+----------+----------+----------+
> > Table 1 - battery voltage (0x1001), getBatteryInfo() (ASE 0), 3rd byte
> >
> > +-------+--------------------------------------+
> > | value |                meaning               |
> > +-------+--------------------------------------+
> > |   0   | Charging                             |
> > +-------+--------------------------------------+
> > |   1   | End of charge (100% charged)         |
> > +-------+--------------------------------------+
> > |   2   | Charge stopped (any "normal" reason) |
> > +-------+--------------------------------------+
> > |   7   | Hardware error                       |
> > +-------+--------------------------------------+
> > Table 2 - chargeStatus value
> >
> > Signed-off-by: Filipe LaÃns <lains@xxxxxxxxxxxxx>
> > ---
> >   drivers/hid/hid-logitech-hidpp.c | 43 ++++++++++++++++----------------
> >   1 file changed, 21 insertions(+), 22 deletions(-)
> >
> > diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
> > index bb063e7d48df..39a5ee0aaab0 100644
> > --- a/drivers/hid/hid-logitech-hidpp.c
> > +++ b/drivers/hid/hid-logitech-hidpp.c
> > @@ -1256,36 +1256,35 @@ static int hidpp20_battery_map_status_voltage(u8 data[3], int *voltage,
> >   {
> >       int status;
> >
> > -     long charge_sts = (long)data[2];
> > +     long flags = (long) data[2];
> >
> > -     *level = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
> > -     switch (data[2] & 0xe0) {
> > -     case 0x00:
> > -             status = POWER_SUPPLY_STATUS_CHARGING;
> > -             break;
> > -     case 0x20:
> > -             status = POWER_SUPPLY_STATUS_FULL;
> > -             *level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
> > -             break;
> > -     case 0x40:
> > +     if (flags & 0x80)
> > +             switch (flags & 0x07) {
> > +             case 0:
> > +                     status = POWER_SUPPLY_STATUS_CHARGING;
> > +                     break;
> > +             case 1:
> > +                     status = POWER_SUPPLY_STATUS_FULL;
> > +                     *level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
> > +                     break;
> > +             case 2:
> > +                     status = POWER_SUPPLY_STATUS_NOT_CHARGING;
> > +                     break;
> > +             default:
> > +                     status = POWER_SUPPLY_STATUS_UNKNOWN;
> > +                     break;
> > +             }
> > +     else
> >               status = POWER_SUPPLY_STATUS_DISCHARGING;
> > -             break;
> > -     case 0xe0:
> > -             status = POWER_SUPPLY_STATUS_NOT_CHARGING;
> > -             break;
> > -     default:
> > -             status = POWER_SUPPLY_STATUS_UNKNOWN;
> > -     }
> >
> >       *charge_type = POWER_SUPPLY_CHARGE_TYPE_STANDARD;
> > -     if (test_bit(3, &charge_sts)) {
> > +     if (test_bit(3, &flags)) {
> >               *charge_type = POWER_SUPPLY_CHARGE_TYPE_FAST;
> >       }
> > -     if (test_bit(4, &charge_sts)) {
> > +     if (test_bit(4, &flags)) {
> >               *charge_type = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
> >       }
> > -
> > -     if (test_bit(5, &charge_sts)) {
> > +     if (test_bit(5, &flags)) {
> >               *level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
> >       }
> >
> >
>
> Tested-by: Pedro Vanzella <pedro@xxxxxxxxxxxxxxxxx>
> Reviewed-by: Pedro Vanzella <pedro@xxxxxxxxxxxxxxxxx>
>