On Thursday 17 December 2015 11:12:53 H. Nikolaus Schaller wrote:
> bug: the driver reports funny capacity values:
>
> root@letux:/sys/class/power_supply/bq27000-battery# cat uevent
> POWER_SUPPLY_NAME=bq27000-battery
> POWER_SUPPLY_STATUS=Charging
> POWER_SUPPLY_PRESENT=1
> POWER_SUPPLY_VOLTAGE_NOW=3702000
> POWER_SUPPLY_CURRENT_NOW=-464635
> POWER_SUPPLY_CAPACITY=1536 <- over 100% is magic
> POWER_SUPPLY_CAPACITY_LEVEL=Normal
> POWER_SUPPLY_TEMP=311
> POWER_SUPPLY_TIME_TO_FULL_NOW=10440
> POWER_SUPPLY_TECHNOLOGY=Li-ion
> POWER_SUPPLY_CHARGE_FULL=805450
> POWER_SUPPLY_CHARGE_NOW=1068
> POWER_SUPPLY_CHARGE_FULL_DESIGN=8844998 <- battery has just 1200 mAh
> POWER_SUPPLY_CYCLE_COUNT=21
> POWER_SUPPLY_ENERGY_NOW=0
> POWER_SUPPLY_POWER_AVG=0
> POWER_SUPPLY_HEALTH=Good
> POWER_SUPPLY_MANUFACTURER=Texas Instruments
>
> reason: the state of charge and the design capacity register are
> single byte only. The design capacity returns the higer order byte.
>
> tested: GTA04 with Openmoko/FIC HF08x battery (using hdq)
>
> Signed-off-by: H. Nikolaus Schaller <h...@goldelico.com>
> ---
> drivers/power/bq27xxx_battery.c | 12 +++++++++---
> 1 file changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/power/bq27xxx_battery.c
> b/drivers/power/bq27xxx_battery.c index 880233c..e54a125 100644
> --- a/drivers/power/bq27xxx_battery.c
> +++ b/drivers/power/bq27xxx_battery.c
> @@ -471,7 +471,10 @@ static int bq27xxx_battery_read_soc(struct
> bq27xxx_device_info *di) {
> int soc;
>
> - soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
> + if (di->chip == BQ27000 || di->chip == BQ27010)
> + soc = bq27xxx_read(di, BQ27XXX_REG_SOC, true);
> + else
> + soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
>
> if (soc < 0)
> dev_dbg(di->dev, "error reading State-of-Charge\n");
> @@ -536,7 +539,10 @@ static int bq27xxx_battery_read_dcap(struct
> bq27xxx_device_info *di) {
> int dcap;
>
> - dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
> + if (di->chip == BQ27000 || di->chip == BQ27010)
> + dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, true);
> + else
> + dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
>
> if (dcap < 0) {
> dev_dbg(di->dev, "error reading initial last measured
> discharge\n"); @@ -544,7 +550,7 @@ static int
> bq27xxx_battery_read_dcap(struct bq27xxx_device_info *di) }
>
> if (di->chip == BQ27000 || di->chip == BQ27010)
> - dcap *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
> + dcap = (dcap << 8) * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
> else
> dcap *= 1000;Hi! This patch fixes commit d74534c27775857cb09abd0f92ed9539dc8d0a93 (power: bq27xxx_battery: Add support for additional bq27xxx family devices) in which this bug (all 3 patch chunks) were introduced. Before that commit code was very similar after applying this patch. So: Reviewed-by: Pali Rohár <pali.ro...@gmail.com> -- Pali Rohár pali.ro...@gmail.com
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