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From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
To: Andy Gross <agross@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Rob Herring <robh+dt@kernel.org>, Zhang Rui <rui.zhang@intel.com>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	Amit Kucheria <amitk@kernel.org>,
	Jonathan Cameron <jic23@kernel.org>,
	Hartmut Knaack <knaack.h@gmx.de>,
	Lars-Peter Clausen <lars@metafoo.de>,
	Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Cc: linux-arm-msm@vger.kernel.org, linux-pm@vger.kernel.org,
	devicetree@vger.kernel.org, linux-iio@vger.kernel.org,
	Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
	Jishnu Prakash <jprakash@qti.qualcomm.com>,
	Craig Tatlor <ctatlor97@gmail.com>,
	Jonathan Cameron <Jonathan.Cameron@huawei.com>
Subject: [PATCH v9 02/15] fixp-arith: add a linear interpolation function
Date: Mon,  2 Nov 2020 20:49:37 +0300
Message-ID: <20201102174950.1148498-3-dmitry.baryshkov@linaro.org> (raw)
In-Reply-To: <20201102174950.1148498-1-dmitry.baryshkov@linaro.org>

From: Craig Tatlor <ctatlor97@gmail.com>

Adds a function to interpolate against two points,
this is carried arount as a helper function by tons of drivers.

Signed-off-by: Craig Tatlor <ctatlor97@gmail.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 include/linux/fixp-arith.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/include/linux/fixp-arith.h b/include/linux/fixp-arith.h
index 8396013785ef..281cb4f83dbe 100644
--- a/include/linux/fixp-arith.h
+++ b/include/linux/fixp-arith.h
@@ -141,4 +141,23 @@ static inline s32 fixp_sin32_rad(u32 radians, u32 twopi)
 #define fixp_cos32_rad(rad, twopi)	\
 	fixp_sin32_rad(rad + twopi / 4, twopi)
 
+/**
+ * fixp_linear_interpolate() - interpolates a value from two known points
+ *
+ * @x0: x value of point 0
+ * @y0: y value of point 0
+ * @x1: x value of point 1
+ * @y1: y value of point 1
+ * @x: the linear interpolant
+ */
+static inline int fixp_linear_interpolate(int x0, int y0, int x1, int y1, int x)
+{
+	if (y0 == y1 || x == x0)
+		return y0;
+	if (x1 == x0 || x == x1)
+		return y1;
+
+	return y0 + ((y1 - y0) * (x - x0) / (x1 - x0));
+}
+
 #endif
-- 
2.28.0


  parent reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-02 17:49 [PATCH v9 00/15] qcom: pm8150: add support for thermal monitoring Dmitry Baryshkov
2020-11-02 17:49 ` [PATCH v9 01/15] dt-bindings: thermal: qcom: add adc-thermal monitor bindings Dmitry Baryshkov
2020-11-04 18:32   ` Rob Herring
2020-11-08 15:52     ` Jonathan Cameron
2020-11-02 17:49 ` Dmitry Baryshkov [this message]
2020-11-02 17:49 ` [PATCH v9 03/15] iio: adc: qcom-vadc: move several adc5 functions to common file Dmitry Baryshkov
2020-11-02 17:49 ` [PATCH v9 04/15] iio: adc: qcom-vadc-common: use fixp_linear_interpolate Dmitry Baryshkov
2020-11-02 17:49 ` [PATCH v9 05/15] iio: adc: move qcom-vadc-common.h to include dir Dmitry Baryshkov
2020-11-02 17:49 ` [PATCH v9 06/15] iio: adc: qcom-spmi-adc5: use of_device_get_match_data Dmitry Baryshkov
2020-11-02 17:49 ` [PATCH v9 07/15] iio: provide of_iio_channel_get_by_name() and devm_ version it Dmitry Baryshkov
2020-11-02 17:49 ` [PATCH v9 08/15] iio: adc: move vadc_map_pt from header to the source file Dmitry Baryshkov
2020-11-02 17:49 ` [PATCH v9 09/15] iio: adc: qcom-vadc-common: rewrite vadc7 die temp calculation Dmitry Baryshkov
2020-11-02 17:49 ` [PATCH v9 10/15] iio: adc: qcom-vadc-common: simplify qcom_vadc_map_voltage_temp Dmitry Baryshkov
2020-11-02 17:49 ` [PATCH v9 11/15] iio: adc: qcom-vadc-common: scale adcmap_100k_104ef_104fb Dmitry Baryshkov
2020-11-02 17:49 ` [PATCH v9 12/15] thermal: qcom: add support for adc-tm5 PMIC thermal monitor Dmitry Baryshkov
2020-11-19 15:33   ` Daniel Lezcano
2020-11-20 22:35     ` Dmitry Baryshkov
2020-11-02 17:49 ` [PATCH v9 13/15] arm64: dts: qcom: pm8150x: add definitions for adc-tm5 part Dmitry Baryshkov
2020-11-02 17:49 ` [PATCH v9 14/15] arm64: dts: sm8250-mtp: add thermal zones using pmic's adc-tm5 Dmitry Baryshkov
2020-11-02 17:49 ` [PATCH v9 15/15] arm64: dts: qrb5165-rb5: port thermal zone definitions Dmitry Baryshkov
2020-11-12 11:39 ` [PATCH v9 00/15] qcom: pm8150: add support for thermal monitoring Daniel Lezcano
2020-11-12 12:41   ` Dmitry Baryshkov
2020-11-12 13:13     ` Daniel Lezcano
2020-11-19 14:42       ` Dmitry Baryshkov

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