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[144.178.202.138]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b55d900bf8csm209905766b.59.2025.10.10.04.23.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 10 Oct 2025 04:23:50 -0700 (PDT) From: Luca Weiss Date: Fri, 10 Oct 2025 13:21:59 +0200 Subject: [PATCH RFC 1/6] iio: adc: qcom-spmi-adc5: Add battery thermal channels Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251010-bat-temp-adc-v1-1-d51ec895dac6@fairphone.com> References: <20251010-bat-temp-adc-v1-0-d51ec895dac6@fairphone.com> In-Reply-To: <20251010-bat-temp-adc-v1-0-d51ec895dac6@fairphone.com> To: Jonathan Cameron , David Lechner , =?utf-8?q?Nuno_S=C3=A1?= , Andy Shevchenko , "Rafael J. Wysocki" , Daniel Lezcano , Zhang Rui , Lukasz Luba , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Laxman Dewangan , Bjorn Andersson , Konrad Dybcio , Hans de Goede , Jens Reidel , Casey Connolly Cc: ~postmarketos/upstreaming@lists.sr.ht, phone-devel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, Luca Weiss X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1760095429; l=4302; i=luca.weiss@fairphone.com; s=20250611; h=from:subject:message-id; bh=mMyIIkLVcrrb0wPuX0C0VvYdWc2+/nklktp5ep9npF0=; b=Anj4djN5fZo5UopPnPuOgAqUeaPAFisNGoBoBxVpGh9NSw16i8ZAnv+A3uAwEefrFWd9OsbKn MdneIq8lbwPCVlC9ITCcTngYAU+EQHqQVzOywSna1lVKqGAZaGtrx4w X-Developer-Key: i=luca.weiss@fairphone.com; a=ed25519; pk=O1aw+AAust5lEmgrNJ1Bs7PTY0fEsJm+mdkjExA69q8= Add the BAT_THERM channels with millivolt as output, which can then be used along with information regarding the NTC in the battery, to get the actual battery temperature. A static lookup table in the ADC driver won't work since different devices have different Ohm and Beta values in their battery NTCs, for example a NTC can be 10kOhm & B=3D3435K. Signed-off-by: Luca Weiss --- drivers/iio/adc/qcom-spmi-adc5.c | 6 ++++++ drivers/iio/adc/qcom-vadc-common.c | 16 ++++++++++++++++ include/linux/iio/adc/qcom-vadc-common.h | 3 +++ 3 files changed, 25 insertions(+) diff --git a/drivers/iio/adc/qcom-spmi-adc5.c b/drivers/iio/adc/qcom-spmi-a= dc5.c index af3c2f659f5e..6ad75368d3a3 100644 --- a/drivers/iio/adc/qcom-spmi-adc5.c +++ b/drivers/iio/adc/qcom-spmi-adc5.c @@ -543,6 +543,12 @@ static const struct adc5_channels adc5_chans_pmic[ADC5= _MAX_CHANNEL] =3D { SCALE_HW_CALIB_DEFAULT) [ADC5_XO_THERM_100K_PU] =3D ADC5_CHAN_TEMP("xo_therm", 0, SCALE_HW_CALIB_XOTHERM) + [ADC5_BAT_THERM_30K_PU] =3D ADC5_CHAN_VOLT("bat_therm_30k_pu", 0, + SCALE_HW_CALIB_THERM_VOLT) + [ADC5_BAT_THERM_100K_PU] =3D ADC5_CHAN_VOLT("bat_therm_100k_pu", 0, + SCALE_HW_CALIB_THERM_VOLT) + [ADC5_BAT_THERM_400K_PU] =3D ADC5_CHAN_VOLT("bat_therm_400k_pu", 0, + SCALE_HW_CALIB_THERM_VOLT) [ADC5_BAT_ID_100K_PU] =3D ADC5_CHAN_TEMP("bat_id", 0, SCALE_HW_CALIB_DEFAULT) [ADC5_AMUX_THM1_100K_PU] =3D ADC5_CHAN_TEMP("amux_thm1_100k_pu", 0, diff --git a/drivers/iio/adc/qcom-vadc-common.c b/drivers/iio/adc/qcom-vadc= -common.c index b03cf584b165..09a13e2b0ef4 100644 --- a/drivers/iio/adc/qcom-vadc-common.c +++ b/drivers/iio/adc/qcom-vadc-common.c @@ -309,6 +309,10 @@ static int qcom_vadc_scale_hw_calib_therm( const struct u32_fract *prescale, const struct adc5_data *data, u16 adc_code, int *result_mdec); +static int qcom_vadc_scale_hw_calib_therm_volt( + const struct u32_fract *prescale, + const struct adc5_data *data, + u16 adc_code, int *result_mdec); static int qcom_vadc7_scale_hw_calib_therm( const struct u32_fract *prescale, const struct adc5_data *data, @@ -333,6 +337,7 @@ static int qcom_vadc7_scale_hw_calib_die_temp( static const struct qcom_adc5_scale_type scale_adc5_fn[] =3D { [SCALE_HW_CALIB_DEFAULT] =3D {qcom_vadc_scale_hw_calib_volt}, [SCALE_HW_CALIB_THERM_100K_PULLUP] =3D {qcom_vadc_scale_hw_calib_therm}, + [SCALE_HW_CALIB_THERM_VOLT] =3D {qcom_vadc_scale_hw_calib_therm_volt}, [SCALE_HW_CALIB_XOTHERM] =3D {qcom_vadc_scale_hw_calib_therm}, [SCALE_HW_CALIB_THERM_100K_PU_PM7] =3D { qcom_vadc7_scale_hw_calib_therm}, @@ -583,6 +588,17 @@ static int qcom_vadc_scale_hw_calib_therm( voltage, result_mdec); } =20 +static int qcom_vadc_scale_hw_calib_therm_volt( + const struct u32_fract *prescale, + const struct adc5_data *data, + u16 adc_code, int *result_uv) +{ + *result_uv =3D qcom_vadc_scale_code_voltage_factor(adc_code, + prescale, data, 1000); + + return 0; +} + static int qcom_vadc_scale_hw_calib_die_temp( const struct u32_fract *prescale, const struct adc5_data *data, diff --git a/include/linux/iio/adc/qcom-vadc-common.h b/include/linux/iio/a= dc/qcom-vadc-common.h index aa21b032e861..3ae091fa93d7 100644 --- a/include/linux/iio/adc/qcom-vadc-common.h +++ b/include/linux/iio/adc/qcom-vadc-common.h @@ -93,6 +93,8 @@ struct vadc_linear_graph { * voltage (uV) with hardware applied offset/slope values to adc code. * SCALE_HW_CALIB_THERM_100K_PULLUP: Returns temperature in millidegC using * lookup table. The hardware applies offset/slope to adc code. + * SCALE_HW_CALIB_THERM_VOLT: Returns voltage in uV of a temperature chann= el. + * The hardware applies offset/slope to adc code. * SCALE_HW_CALIB_XOTHERM: Returns XO thermistor voltage in millidegC using * 100k pullup. The hardware applies offset/slope to adc code. * SCALE_HW_CALIB_THERM_100K_PU_PM7: Returns temperature in millidegC using @@ -114,6 +116,7 @@ enum vadc_scale_fn_type { SCALE_PMI_CHG_TEMP, SCALE_HW_CALIB_DEFAULT, SCALE_HW_CALIB_THERM_100K_PULLUP, + SCALE_HW_CALIB_THERM_VOLT, SCALE_HW_CALIB_XOTHERM, SCALE_HW_CALIB_THERM_100K_PU_PM7, SCALE_HW_CALIB_PMIC_THERM, --=20 2.51.0