Hi,
On Wed, Mar 12, 2025 at 02:14:09PM +0200, Sicelo A. Mhlongo wrote:
> On the bq27x00 and bq27x10 variants, a number of conditions can reset the
> value stored in the NAC register. This will cause capacity, time-to-empty,
> energy, and charge to report the value 0, even when the battery is full.
> On the other hand, the chips provide a flag, EDVF, which reliably reports
> the true battery empty condition, when these properties are really zero.
> Therefore, discard readings for these properties if their value is 0 while
> EDVF is unset.
>
> Tested on the Nokia N900 with bq27200.
>
> Signed-off-by: Sicelo A. Mhlongo <absicsz@???>
> ---
> drivers/power/supply/bq27xxx_battery.c | 25 +++++++++++++++++++++++--
> 1 file changed, 23 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/power/supply/bq27xxx_battery.c b/drivers/power/supply/bq27xxx_battery.c
> index 2f31d750a4c1..29fc51653b5f 100644
> --- a/drivers/power/supply/bq27xxx_battery.c
> +++ b/drivers/power/supply/bq27xxx_battery.c
> @@ -2147,6 +2147,10 @@ static int bq27xxx_battery_get_property(struct power_supply *psy,
> ret = bq27xxx_battery_current_and_status(di, val, NULL, NULL);
> break;
> case POWER_SUPPLY_PROP_CAPACITY:
> + /* If 0 is reported, it is expected that EDVF is also set */
> + if (!di->cache.capacity && di->opts & BQ27XXX_O_ZERO &&
> + !(di->cache.flags & BQ27000_FLAG_EDVF))
> + return -EINVAL;
This has been replicated 5 times in this patch now. Please create a
small helper function for it. Something like
/* If val == 0 is reported, it is expected that EDVF is also set */
void bq27xxx_check_zero_edvf(int *ret, int val, struct bq27xxx_device_info *di) {
if (*ret)
return;
if (val)
return;
if (!(di->opts & BQ27XXX_O_ZERO))
return;
if (di->cache.flags & BQ27000_FLAG_EDVF)
return;
*ret = -EINVAL;
}
bq27xxx_check_zero_edvf(ret, di->cache.capacity, di);
Otherwise I think it is sensible to wait for H . Nikolaus Schaller
to give this another test (possibly in v3).
-- Greetings,
-- Sebastian
> ret = bq27xxx_simple_value(di->cache.capacity, val);
> break;
> case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
> @@ -2157,9 +2161,17 @@ static int bq27xxx_battery_get_property(struct power_supply *psy,
> break;
> case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
> ret = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTE, val);
> + /* If 0 is reported, it is expected that EDVF is also set */
> + if (!ret && !val->intval && di->opts & BQ27XXX_O_ZERO &&
> + !(di->cache.flags & BQ27000_FLAG_EDVF))
> + return -EINVAL;
> break;
> case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
> ret = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTECP, val);
> + /* If 0 is reported, it is expected that EDVF is also set */
> + if (!ret && !val->intval && di->opts & BQ27XXX_O_ZERO &&
> + !(di->cache.flags & BQ27000_FLAG_EDVF))
> + return -EINVAL;
> break;
> case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
> ret = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTF, val);
> @@ -2171,10 +2183,15 @@ static int bq27xxx_battery_get_property(struct power_supply *psy,
> val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
> break;
> case POWER_SUPPLY_PROP_CHARGE_NOW:
> - if (di->regs[BQ27XXX_REG_NAC] != INVALID_REG_ADDR)
> + if (di->regs[BQ27XXX_REG_NAC] != INVALID_REG_ADDR) {
> ret = bq27xxx_battery_read_nac(di, val);
> - else
> + /* If 0 is reported, it is expected that EDVF is also set */
> + if (!ret && !val->intval && di->opts & BQ27XXX_O_ZERO &&
> + !(di->cache.flags & BQ27000_FLAG_EDVF))
> + return -EINVAL;
> + } else {
> ret = bq27xxx_battery_read_rc(di, val);
> + }
> break;
> case POWER_SUPPLY_PROP_CHARGE_FULL:
> ret = bq27xxx_battery_read_fcc(di, val);
> @@ -2199,6 +2216,10 @@ static int bq27xxx_battery_get_property(struct power_supply *psy,
> break;
> case POWER_SUPPLY_PROP_ENERGY_NOW:
> ret = bq27xxx_battery_read_energy(di, val);
> + /* If 0 is reported, it is expected that EDVF is also set */
> + if (!ret && !val->intval && di->opts & BQ27XXX_O_ZERO &&
> + !(di->cache.flags & BQ27000_FLAG_EDVF))
> + return -EINVAL;
> break;
> case POWER_SUPPLY_PROP_POWER_AVG:
> ret = bq27xxx_battery_pwr_avg(di, val);
> --
> 2.47.2
>
::
Re: [maemo-leste] [PATCH 2/2] power…
