From: "Vaittinen, Matti" <Matti.Vaittinen@fi.rohmeurope.com>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: Matti Vaittinen <mazziesaccount@gmail.com>,
Sebastian Reichel <sre@kernel.org>,
Rob Herring <robh+dt@kernel.org>,
Lee Jones <lee.jones@linaro.org>,
"rostokus@gmail.com" <rostokus@gmail.com>,
"fan.chen@mediatek.com" <fan.chen@mediatek.com>,
"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
linux-power <linux-power@fi.rohmeurope.com>
Subject: Re: [RFC PATCH v3 2/9] power: supply: add cap2ocv batinfo helper
Date: Thu, 18 Nov 2021 05:30:51 +0000 [thread overview]
Message-ID: <8cd66743-242f-f4dd-c767-1f37551c7e78@fi.rohmeurope.com> (raw)
In-Reply-To: <CACRpkdZJ50Q94inqpNfo-x4ivEq50yiisP2KAFOu3hr1Y8+Yrg@mail.gmail.com>
On 11/18/21 04:02, Linus Walleij wrote:
> On Tue, Nov 16, 2021 at 1:25 PM Matti Vaittinen
> <matti.vaittinen@fi.rohmeurope.com> wrote:
>
>> The power-supply core supports concept of OCV (Open Circuit Voltage) =>
>> SOC (State Of Charge) conversion tables. Usually these tables are used
>> to estimate SOC based on OCV. Some systems use so called "Zero Adjust"
>> where at the near end-of-battery condition the SOC from coulomb counter
>> is used to retrieve the OCV - and OCV and VSYS difference is used to
>> re-estimate the battery capacity.
>>
>> Add helper to do look-up the other-way around and also get the OCV
>> based on SOC
>>
>> Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
>
> It seems you will need this for your chargers indeed.
>
>> +int power_supply_dcap2ocv_simple(struct power_supply_battery_ocv_table *table,
>> + int table_len, int dcap)
>> +{
>> + int i, ocv, tmp;
>> +
>> + for (i = 0; i < table_len; i++)
>> + if (dcap > table[i].capacity * 10)
>> + break;
>> +
>> + if (i > 0 && i < table_len) {
>> + tmp = (table[i - 1].ocv - table[i].ocv) *
>> + (dcap - table[i].capacity * 10);
>> +
>> + tmp /= (table[i - 1].capacity - table[i].capacity) * 10;
>> + ocv = tmp + table[i].ocv;
>> + } else if (i == 0) {
>> + ocv = table[0].ocv;
>> + } else {
>> + ocv = table[table_len - 1].ocv;
>> + }
>> +
>> + return ocv;
>> +}
>> +EXPORT_SYMBOL_GPL(power_supply_dcap2ocv_simple);
>
> Rewrite this using the library fixpoint interpolation function but just
> copypasting from my patch:
> https://lore.kernel.org/linux-pm/20211116230233.2167104-1-linus.walleij@linaro.org/
Thanks :)
I actually saw this (yesterday?) but didn't revise my patches. Thanks
for the head's up - it's always good to have this kind of helpers :)
>
> Other than that it looks good to me!
Thanks!
Best Regards
--Matti
--
The Linux Kernel guy at ROHM Semiconductors
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND
~~ this year is the year of a signature writers block ~~
next prev parent reply other threads:[~2021-11-18 5:31 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-16 12:24 [RFC PATCH v3 0/9] power: supply: Add some fuel-gauge logic Matti Vaittinen
2021-11-16 12:24 ` [RFC PATCH v3 1/9] dt-bindings: battery: Add temperature-capacity degradation table Matti Vaittinen
2021-11-16 14:02 ` Rob Herring
2021-11-18 1:57 ` Linus Walleij
2021-11-18 5:27 ` Vaittinen, Matti
2021-11-16 12:25 ` [RFC PATCH v3 2/9] power: supply: add cap2ocv batinfo helper Matti Vaittinen
2021-11-18 2:02 ` Linus Walleij
2021-11-18 5:30 ` Vaittinen, Matti [this message]
2021-11-16 12:25 ` [RFC PATCH v3 3/9] power: supply: Support DT originated temperature-capacity tables Matti Vaittinen
2021-11-18 2:10 ` Linus Walleij
2021-11-18 6:11 ` Vaittinen, Matti
2021-11-26 11:56 ` Vaittinen, Matti
2021-11-26 12:35 ` Matti Vaittinen
2021-11-27 0:55 ` Linus Walleij
2021-11-27 0:54 ` Linus Walleij
2021-11-28 8:51 ` Vaittinen, Matti
2021-11-30 1:34 ` Linus Walleij
2021-11-30 6:33 ` Vaittinen, Matti
2021-12-02 1:57 ` Linus Walleij
2021-12-02 6:29 ` Vaittinen, Matti
2021-12-05 0:30 ` Linus Walleij
2021-11-16 12:26 ` [RFC PATCH v3 4/9] power: supply: Add batinfo getters usable prior supply registration Matti Vaittinen
2021-11-19 1:42 ` Linus Walleij
2021-11-16 12:27 ` [RFC PATCH v3 5/9] power: supply: Add constant battery aging degradation to batinfo Matti Vaittinen
2021-11-16 12:27 ` [RFC PATCH v3 6/9] power: supply: Add batinfo functions for OCV to SOC with 0.1% accuracy Matti Vaittinen
2021-11-19 1:49 ` Linus Walleij
2021-11-19 8:11 ` Matti Vaittinen
2021-11-16 12:28 ` [RFC PATCH v3 7/9] power: supply: add simple-gauge for SOC estimation and CC correction Matti Vaittinen
2021-11-19 1:54 ` Linus Walleij
2021-11-16 12:29 ` [RFC PATCH v3 8/9] mfd: bd71828, bd71815 prepare for power-supply support Matti Vaittinen
2021-11-16 12:29 ` [RFC PATCH v3 9/9] power: supply: Add bd718(15/27/28/78) charger driver Matti Vaittinen
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