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Date:   Wed, 23 Dec 2020 00:40:09 +0000
From:   Hermes Zhang <Hermes.Zhang@...s.com>
To:     Pali Rohár <pali@...nel.org>,
        Pavel Machek <pavel@....cz>
CC:     Dan Murphy <dmurphy@...com>, Sebastian Reichel <sre@...nel.org>,
        kernel <kernel@...s.com>, Hermes Zhang <Hermes.Zhang@...s.com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] power: supply: bq27xxx: Supporrt CHARGE_NOW for
 bq27z561/bq28z610/bq34z100

On 12/22/20 7:53 PM, Pali Rohár wrote:
> On Tuesday 22 December 2020 19:07:20 Hermes Zhang wrote:
>> From: Hermes Zhang <chenhuiz@...s.com>
>>
>> The CHARGE_NOW is map to REG_NAC for all the gauge chips beofre. But for
>> some chips (e.g. bq27z561) which doesn't have the REG_NAC, we use REG_RC
>> (remaining capacity) for CHARGE_NOW.
>>
>> Signed-off-by: Hermes Zhang <chenhuiz@...s.com>
>> ---
>>
>> Notes:
>>      Set correct REG_RC for all the chips if have
>>      
>>      keep INVALID_REG_ADDR for bq27521, as we could not find
>>      the datasheet and seems no one use it now.
> This chip is used in Nokia N950 and Nokia N9. Pavel implemented kernel
> support, adding to loop.
>
> Public information about it are at:
> https://elinux.org/N950#sn27521_register_map

Thanks for the info. From the link it seem bq27521 have neither NAC and 
RC register.


Best Regards,

Hermes

>
>>   drivers/power/supply/bq27xxx_battery.c | 35 +++++++++++++++++++++++++-
>>   1 file changed, 34 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/power/supply/bq27xxx_battery.c b/drivers/power/supply/bq27xxx_battery.c
>> index 315e0909e6a4..774aa376653e 100644
>> --- a/drivers/power/supply/bq27xxx_battery.c
>> +++ b/drivers/power/supply/bq27xxx_battery.c
>> @@ -110,6 +110,7 @@ enum bq27xxx_reg_index {
>>   	BQ27XXX_REG_TTES,	/* Time-to-Empty Standby */
>>   	BQ27XXX_REG_TTECP,	/* Time-to-Empty at Constant Power */
>>   	BQ27XXX_REG_NAC,	/* Nominal Available Capacity */
>> +	BQ27XXX_REG_RC,		/* Remaining Capacity */
>>   	BQ27XXX_REG_FCC,	/* Full Charge Capacity */
>>   	BQ27XXX_REG_CYCT,	/* Cycle Count */
>>   	BQ27XXX_REG_AE,		/* Available Energy */
>> @@ -145,6 +146,7 @@ static u8
>>   		[BQ27XXX_REG_TTES] = 0x1c,
>>   		[BQ27XXX_REG_TTECP] = 0x26,
>>   		[BQ27XXX_REG_NAC] = 0x0c,
>> +		[BQ27XXX_REG_RC] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_FCC] = 0x12,
>>   		[BQ27XXX_REG_CYCT] = 0x2a,
>>   		[BQ27XXX_REG_AE] = 0x22,
>> @@ -169,6 +171,7 @@ static u8
>>   		[BQ27XXX_REG_TTES] = 0x1c,
>>   		[BQ27XXX_REG_TTECP] = 0x26,
>>   		[BQ27XXX_REG_NAC] = 0x0c,
>> +		[BQ27XXX_REG_RC] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_FCC] = 0x12,
>>   		[BQ27XXX_REG_CYCT] = 0x2a,
>>   		[BQ27XXX_REG_AE] = INVALID_REG_ADDR,
>> @@ -193,6 +196,7 @@ static u8
>>   		[BQ27XXX_REG_TTES] = 0x1a,
>>   		[BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_NAC] = 0x0c,
>> +		[BQ27XXX_REG_RC] = 0x10,
>>   		[BQ27XXX_REG_FCC] = 0x12,
>>   		[BQ27XXX_REG_CYCT] = 0x2a,
>>   		[BQ27XXX_REG_AE] = INVALID_REG_ADDR,
>> @@ -215,6 +219,7 @@ static u8
>>   		[BQ27XXX_REG_TTES] = 0x1c,
>>   		[BQ27XXX_REG_TTECP] = 0x26,
>>   		[BQ27XXX_REG_NAC] = 0x0c,
>> +		[BQ27XXX_REG_RC] = 0x10,
>>   		[BQ27XXX_REG_FCC] = 0x12,
>>   		[BQ27XXX_REG_CYCT] = 0x2a,
>>   		[BQ27XXX_REG_AE] = 0x22,
>> @@ -237,6 +242,7 @@ static u8
>>   		[BQ27XXX_REG_TTES] = 0x1a,
>>   		[BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_NAC] = 0x0c,
>> +		[BQ27XXX_REG_RC] = 0x10,
>>   		[BQ27XXX_REG_FCC] = 0x12,
>>   		[BQ27XXX_REG_CYCT] = 0x1e,
>>   		[BQ27XXX_REG_AE] = INVALID_REG_ADDR,
>> @@ -257,6 +263,7 @@ static u8
>>   		[BQ27XXX_REG_TTES] = 0x1c,
>>   		[BQ27XXX_REG_TTECP] = 0x26,
>>   		[BQ27XXX_REG_NAC] = 0x0c,
>> +		[BQ27XXX_REG_RC] = 0x10,
>>   		[BQ27XXX_REG_FCC] = 0x12,
>>   		[BQ27XXX_REG_CYCT] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_AE] = 0x22,
>> @@ -277,6 +284,7 @@ static u8
>>   		[BQ27XXX_REG_TTES] = 0x1c,
>>   		[BQ27XXX_REG_TTECP] = 0x26,
>>   		[BQ27XXX_REG_NAC] = 0x0c,
>> +		[BQ27XXX_REG_RC] = 0x10,
>>   		[BQ27XXX_REG_FCC] = 0x12,
>>   		[BQ27XXX_REG_CYCT] = 0x2a,
>>   		[BQ27XXX_REG_AE] = 0x22,
>> @@ -297,6 +305,7 @@ static u8
>>   		[BQ27XXX_REG_TTES] = 0x1c,
>>   		[BQ27XXX_REG_TTECP] = 0x26,
>>   		[BQ27XXX_REG_NAC] = 0x0c,
>> +		[BQ27XXX_REG_RC] = 0x10,
>>   		[BQ27XXX_REG_FCC] = 0x12,
>>   		[BQ27XXX_REG_CYCT] = 0x2a,
>>   		[BQ27XXX_REG_AE] = 0x22,
>> @@ -317,6 +326,7 @@ static u8
>>   		[BQ27XXX_REG_TTES] = 0x1c,
>>   		[BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_NAC] = 0x0c,
>> +		[BQ27XXX_REG_RC] = 0x10,
>>   		[BQ27XXX_REG_FCC] = 0x12,
>>   		[BQ27XXX_REG_CYCT] = 0x1e,
>>   		[BQ27XXX_REG_AE] = INVALID_REG_ADDR,
>> @@ -337,6 +347,7 @@ static u8
>>   		[BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_NAC] = INVALID_REG_ADDR,
>> +		[BQ27XXX_REG_RC] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_FCC] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_CYCT] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_AE] = INVALID_REG_ADDR,
>> @@ -361,6 +372,7 @@ static u8
>>   		[BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_NAC] = 0x0c,
>> +		[BQ27XXX_REG_RC] = 0x10,
>>   		[BQ27XXX_REG_FCC] = 0x12,
>>   		[BQ27XXX_REG_CYCT] = 0x2a,
>>   		[BQ27XXX_REG_AE] = INVALID_REG_ADDR,
>> @@ -382,6 +394,7 @@ static u8
>>   		[BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_NAC] = 0x0c,
>> +		[BQ27XXX_REG_RC] = 0x10,
>>   		[BQ27XXX_REG_FCC] = 0x12,
>>   		[BQ27XXX_REG_CYCT] = 0x2a,
>>   		[BQ27XXX_REG_AE] = INVALID_REG_ADDR,
>> @@ -405,6 +418,7 @@ static u8
>>   		[BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_NAC] = 0x0c,
>> +		[BQ27XXX_REG_RC] = 0x10,
>>   		[BQ27XXX_REG_FCC] = 0x12,
>>   		[BQ27XXX_REG_CYCT] = 0x2a,
>>   		[BQ27XXX_REG_AE] = INVALID_REG_ADDR,
>> @@ -425,6 +439,7 @@ static u8
>>   		[BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_NAC] = 0x08,
>> +		[BQ27XXX_REG_RC] = 0x0c,
>>   		[BQ27XXX_REG_FCC] = 0x0e,
>>   		[BQ27XXX_REG_CYCT] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_AE] = INVALID_REG_ADDR,
>> @@ -450,6 +465,7 @@ static u8
>>   		[BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_NAC] = INVALID_REG_ADDR,
>> +		[BQ27XXX_REG_RC] = 0x10,
>>   		[BQ27XXX_REG_FCC] = 0x12,
>>   		[BQ27XXX_REG_CYCT] = 0x2a,
>>   		[BQ27XXX_REG_AE] = 0x22,
>> @@ -470,6 +486,7 @@ static u8
>>   		[BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_NAC] = INVALID_REG_ADDR,
>> +		[BQ27XXX_REG_RC] = 0x10,
>>   		[BQ27XXX_REG_FCC] = 0x12,
>>   		[BQ27XXX_REG_CYCT] = 0x2a,
>>   		[BQ27XXX_REG_AE] = 0x22,
>> @@ -490,6 +507,7 @@ static u8
>>   		[BQ27XXX_REG_TTES] = 0x1e,
>>   		[BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
>>   		[BQ27XXX_REG_NAC] = INVALID_REG_ADDR,
>> +		[BQ27XXX_REG_RC] = 0x04,
>>   		[BQ27XXX_REG_FCC] = 0x06,
>>   		[BQ27XXX_REG_CYCT] = 0x2c,
>>   		[BQ27XXX_REG_AE] = 0x24,
>> @@ -745,6 +763,7 @@ static enum power_supply_property bq27z561_props[] = {
>>   	POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
>>   	POWER_SUPPLY_PROP_TECHNOLOGY,
>>   	POWER_SUPPLY_PROP_CHARGE_FULL,
>> +	POWER_SUPPLY_PROP_CHARGE_NOW,
>>   	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
>>   	POWER_SUPPLY_PROP_CYCLE_COUNT,
>>   	POWER_SUPPLY_PROP_POWER_AVG,
>> @@ -764,6 +783,7 @@ static enum power_supply_property bq28z610_props[] = {
>>   	POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
>>   	POWER_SUPPLY_PROP_TECHNOLOGY,
>>   	POWER_SUPPLY_PROP_CHARGE_FULL,
>> +	POWER_SUPPLY_PROP_CHARGE_NOW,
>>   	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
>>   	POWER_SUPPLY_PROP_CYCLE_COUNT,
>>   	POWER_SUPPLY_PROP_POWER_AVG,
>> @@ -784,6 +804,7 @@ static enum power_supply_property bq34z100_props[] = {
>>   	POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
>>   	POWER_SUPPLY_PROP_TECHNOLOGY,
>>   	POWER_SUPPLY_PROP_CHARGE_FULL,
>> +	POWER_SUPPLY_PROP_CHARGE_NOW,
>>   	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
>>   	POWER_SUPPLY_PROP_CYCLE_COUNT,
>>   	POWER_SUPPLY_PROP_ENERGY_NOW,
>> @@ -1518,6 +1539,15 @@ static inline int bq27xxx_battery_read_nac(struct bq27xxx_device_info *di)
>>   	return bq27xxx_battery_read_charge(di, BQ27XXX_REG_NAC);
>>   }
>>   
>> +/*
>> + * Return the battery Remaining Capacity in µAh
>> + * Or < 0 if something fails.
>> + */
>> +static inline int bq27xxx_battery_read_rc(struct bq27xxx_device_info *di)
>> +{
>> +	return bq27xxx_battery_read_charge(di, BQ27XXX_REG_RC);
>> +}
>> +
>>   /*
>>    * Return the battery Full Charge Capacity in µAh
>>    * Or < 0 if something fails.
>> @@ -1965,7 +1995,10 @@ static int bq27xxx_battery_get_property(struct power_supply *psy,
>>   			val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
>>   		break;
>>   	case POWER_SUPPLY_PROP_CHARGE_NOW:
>> -		ret = bq27xxx_simple_value(bq27xxx_battery_read_nac(di), val);
>> +		if (di->regs[BQ27XXX_REG_NAC] != INVALID_REG_ADDR)
>> +			ret = bq27xxx_simple_value(bq27xxx_battery_read_nac(di), val);
>> +		else
>> +			ret = bq27xxx_simple_value(bq27xxx_battery_read_rc(di), val);
>>   		break;
>>   	case POWER_SUPPLY_PROP_CHARGE_FULL:
>>   		ret = bq27xxx_simple_value(di->cache.charge_full, val);
>> -- 
>> 2.20.1
>>

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