Hi,

Please do one change per patch:

On Tue, Oct 20, 2020 at 10:53:12PM +0200, Dev Null wrote:
> Adds a module option to ignore a missing temerature sensor.

first patch

> Invalidates empty->counter_uah and charge_full when charge_now indicates that they are grossly wrong

second patch

> Makes charge_full_design writeable, so that different/custom batteries can be used.

third patch

> This is especially usfull on XTT875 where both HW4X and BW8X exsist.

missing Signed-off-by.

> diff --git a/drivers/power/supply/cpcap-battery.c b/drivers/power/supply/cpcap-battery.c
> index 3be76cd7584a..ffa70c31c1cb 100644
> --- a/drivers/power/supply/cpcap-battery.c
> +++ b/drivers/power/supply/cpcap-battery.c
> @@ -28,6 +28,7 @@
>  #include <linux/power_supply.h>
>  #include <linux/reboot.h>
>  #include <linux/regmap.h>
> +#include <linux/moduleparam.h>
>  
>  #include <linux/iio/consumer.h>
>  #include <linux/iio/types.h>
> @@ -162,6 +163,9 @@ static const struct cpcap_battery_capacity cpcap_battery_cap[] = {
>  
>  #define CPCAP_NO_BATTERY	-400
>  
> +static bool ignore_temperature_probe;
> +module_param(ignore_temperature_probe, bool, 0660);

Can this be deferred from DT (i.e. always disable temperature probe
on XT875)? Having to specify a module parameter to get a working
system is not very user friendly.

>  static struct cpcap_battery_state_data *
>  cpcap_battery_get_state(struct cpcap_battery_ddata *ddata,
>  			enum cpcap_battery_state state)
> @@ -205,7 +209,8 @@ static int cpcap_charger_battery_temperature(struct cpcap_battery_ddata *ddata,
>  	channel = ddata->channels[CPCAP_BATTERY_IIO_BATTDET];
>  	error = iio_read_channel_processed(channel, value);
>  	if (error < 0) {
> -		dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
> +		if (!ignore_temperature_probe)
> +			dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
>  		*value = CPCAP_NO_BATTERY;
>  
>  		return error;
> @@ -558,7 +563,7 @@ static int cpcap_battery_get_property(struct power_supply *psy,
>  
>  	switch (psp) {
>  	case POWER_SUPPLY_PROP_PRESENT:
> -		if (latest->temperature > CPCAP_NO_BATTERY)
> +		if (latest->temperature > CPCAP_NO_BATTERY || ignore_temperature_probe)
>  			val->intval = 1;
>  		else
>  			val->intval = 0;
> @@ -641,10 +646,22 @@ static int cpcap_battery_get_property(struct power_supply *psy,
>  		if (!empty->voltage)
>  			return -ENODATA;
>  		val->intval = empty->counter_uah - latest->counter_uah;
> -		if (val->intval < 0)
> +		if (val->intval < 0) {
> +			if (ddata->charge_full && abs(val->intval) > ddata->charge_full/5) {
> +				empty->voltage = 0;
> +				ddata->charge_full = 0;
> +				return -ENODATA;
> +			}
>  			val->intval = 0;
> -		else if (ddata->charge_full && ddata->charge_full < val->intval)
> +		}
> +		else if (ddata->charge_full && ddata->charge_full < val->intval) {
> +			if (val->intval > (6*ddata->charge_full)/5) {
> +				empty->voltage = 0;
> +				ddata->charge_full = 0;
> +				return -ENODATA;
> +			}
>  			val->intval = ddata->charge_full;
> +		}

The context of this patch is not available in cpcap-battery driver
from mainline. So this has dependencies on other patches, which
need to be submitted first. I currently do not have any pending
cpcap patches, but IIRC there was a big patchset which had to be
resubmitted.

>  		break;
>  	case POWER_SUPPLY_PROP_CHARGE_FULL:
>  		if (!ddata->charge_full)
> @@ -658,6 +675,8 @@ static int cpcap_battery_get_property(struct power_supply *psy,
>  		val->intval = POWER_SUPPLY_SCOPE_SYSTEM;
>  		break;
>  	case POWER_SUPPLY_PROP_TEMP:
> +		if (ignore_temperature_probe)
> +			return -ENODATA;
>  		val->intval = latest->temperature;
>  		break;
>  	default:
> @@ -715,11 +734,18 @@ static int cpcap_battery_set_property(struct power_supply *psy,
>  	case POWER_SUPPLY_PROP_CHARGE_FULL:
>  		if (val->intval < 0)
>  			return -EINVAL;
> -		if (val->intval > ddata->config.info.charge_full_design)
> +		if (val->intval > (6*ddata->config.info.charge_full_design)/5)

This deserves a comment. Why do we allow to set charge full to be
above full design capacity?

>  			return -EINVAL;
>  
>  		ddata->charge_full = val->intval;
>  
> +		return 0;
> +	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
> +		if (val->intval < 0)
> +			return -EINVAL;
> +
> +		ddata->config.info.charge_full_design = val->intval;
> +
>  		return 0;
>  	default:
>  		return -EINVAL;
> @@ -734,6 +760,7 @@ static int cpcap_battery_property_is_writeable(struct power_supply *psy,
>  	switch (psp) {
>  	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
>  	case POWER_SUPPLY_PROP_CHARGE_FULL:
> +	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
>  		return 1;
>  	default:
>  		return 0;
> 
> -- 
> Dev Null <devnull@uvos.xyz>

-- Sebastian