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[2001:14ba:16ee:fa00::4]) by smtp.gmail.com with ESMTPSA id w36sm1751324lfu.81.2021.11.16.04.27.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 Nov 2021 04:27:47 -0800 (PST) Date: Tue, 16 Nov 2021 14:27:40 +0200 From: Matti Vaittinen To: Matti Vaittinen , Matti Vaittinen Cc: Sebastian Reichel , Rob Herring , Matti Vaittinen , Lee Jones , Linus Walleij , rostokus@gmail.com, fan.chen@mediatek.com, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-power@fi.rohmeurope.com Subject: [RFC PATCH v3 6/9] power: supply: Add batinfo functions for OCV to SOC with 0.1% accuracy Message-ID: <392c7aa891d466bc4df06a076090150319e0e7dc.1637061794.git.matti.vaittinen@fi.rohmeurope.com> References: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="3tObPVaWIpRkTkET" Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --3tObPVaWIpRkTkET Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable The battery info functions computing the state-of-charge (SOC) based on open-circuit-voltage (OCV) are returning SOC using units of 1%. Some capacity estimation computations require higher accuracy. Add functions that return SOC using units of 0.1% to reduce rounding error. Signed-off-by: Matti Vaittinen --- RFCv3 changes: - Kerneldoc fixes --- drivers/power/supply/power_supply_core.c | 65 ++++++++++++++++++++++++ include/linux/power_supply.h | 4 ++ 2 files changed, 69 insertions(+) diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/suppl= y/power_supply_core.c index ebc961b5aa45..62ea113db3b4 100644 --- a/drivers/power/supply/power_supply_core.c +++ b/drivers/power/supply/power_supply_core.c @@ -1003,6 +1003,45 @@ int power_supply_ocv2cap_simple(struct power_supply_= battery_ocv_table *table, } EXPORT_SYMBOL_GPL(power_supply_ocv2cap_simple); =20 +/** + * power_supply_ocv2dcap_simple() - find the battery capacity at 0.1% accu= racy + * @table: Pointer to battery OCV lookup table + * @table_len: OCV table length + * @ocv: Current OCV value + * + * This helper function is used to look up battery capacity according to + * current OCV value from one OCV table, and the OCV table must be ordered + * descending. Return the SOC in the units of 0.1% for improved accuracy. + * + * Return: the battery capacity using the unit 0.1%. + */ +int power_supply_ocv2dcap_simple(struct power_supply_battery_ocv_table *ta= ble, + int table_len, int ocv) +{ + int i, cap, tmp; + + for (i =3D 0; i < table_len; i++) + if (ocv > table[i].ocv) + break; + + if (i > 0 && i < table_len) { + tmp =3D (table[i - 1].capacity - table[i].capacity) * + (ocv - table[i].ocv) * 10; + tmp /=3D table[i - 1].ocv - table[i].ocv; + cap =3D tmp + table[i].capacity * 10; + } else if (i =3D=3D 0) { + cap =3D table[0].capacity * 10; + } else { + cap =3D table[table_len - 1].capacity * 10; + } + + if (cap < 0) + cap =3D 0; + + return cap; +} +EXPORT_SYMBOL_GPL(power_supply_ocv2dcap_simple); + struct power_supply_battery_ocv_table * power_supply_find_ocv2cap_table(struct power_supply_battery_info *info, int temp, int *table_len) @@ -1054,6 +1093,32 @@ int power_supply_batinfo_dcap2ocv(struct power_suppl= y_battery_info *info, } EXPORT_SYMBOL_GPL(power_supply_batinfo_dcap2ocv); =20 +/** + * power_supply_batinfo_ocv2dcap - compute SOC based on OCV and temperature + * @info: pointer to battery information + * @ocv: Open circuit voltage in uV + * @temp: Temperature in Celsius + * + * Use OCV tables in battery info to compute the battery capacity based on + * provided open circuit voltage at given and temperature. + * + * Return: battery capacity correspondinggiven OCV and temperature at 0.1%. + * -EINVAL if OCV table is not present. + */ +int power_supply_batinfo_ocv2dcap(struct power_supply_battery_info *info, + int ocv, int temp) +{ + struct power_supply_battery_ocv_table *table; + int table_len; + + table =3D power_supply_find_ocv2cap_table(info, temp, &table_len); + if (!table) + return -EINVAL; + + return power_supply_ocv2dcap_simple(table, table_len, ocv); +} +EXPORT_SYMBOL_GPL(power_supply_batinfo_ocv2dcap); + int power_supply_batinfo_ocv2cap(struct power_supply_battery_info *info, int ocv, int temp) { diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h index c5118265b3ab..5e6575e97492 100644 --- a/include/linux/power_supply.h +++ b/include/linux/power_supply.h @@ -444,6 +444,10 @@ extern int power_supply_ocv2cap_simple(struct power_su= pply_battery_ocv_table *ta int table_len, int ocv); int power_supply_dcap2ocv_simple(struct power_supply_battery_ocv_table *ta= ble, int table_len, int dcap); +int power_supply_ocv2dcap_simple(struct power_supply_battery_ocv_table *ta= ble, + int table_len, int ocv); +int power_supply_batinfo_ocv2dcap(struct power_supply_battery_info *info, + int ocv, int temp); =20 extern struct power_supply_battery_ocv_table * power_supply_find_ocv2cap_table(struct power_supply_battery_info *info, --=20 2.31.1 --=20 Matti Vaittinen, Linux device drivers ROHM Semiconductors, Finland SWDC Kiviharjunlenkki 1E 90220 OULU FINLAND ~~~ "I don't think so," said Rene Descartes. 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