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>,
Craig Tatlor <ctatlor97@gmail.com>,
Jonathan Cameron <Jonathan.Cameron@huawei.com>
Subject: [PATCH v5 2/9] fixp-arith: add a linear interpolation function
Date: Mon, 14 Sep 2020 18:48:02 +0300 [thread overview]
Message-ID: <20200914154809.192174-3-dmitry.baryshkov@linaro.org> (raw)
In-Reply-To: <20200914154809.192174-1-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
next prev parent reply other threads:[~2020-09-14 15:58 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-14 15:48 [PATCH v5 0/9] qcom: pm8150: add support for thermal monitoring Dmitry Baryshkov
2020-09-14 15:48 ` [PATCH v5 1/9] dt-bindings: thermal: qcom: add adc-thermal monitor bindings Dmitry Baryshkov
2020-09-22 23:40 ` Rob Herring
2020-09-23 9:07 ` Dmitry Baryshkov
2020-09-23 14:00 ` Rob Herring
2020-09-23 15:22 ` Jonathan Cameron
2020-09-14 15:48 ` Dmitry Baryshkov [this message]
2020-09-14 15:48 ` [PATCH v5 3/9] iio: adc: qcom-vadc: move several adc5 functions to common file Dmitry Baryshkov
2020-09-14 15:48 ` [PATCH v5 4/9] iio: adc: qcom-vadc-common: use fixp_linear_interpolate Dmitry Baryshkov
2020-09-14 15:48 ` [PATCH v5 5/9] iio: adc: qcom-spmi-adc5: use of_device_get_match_data Dmitry Baryshkov
2020-09-14 15:48 ` [PATCH v5 6/9] iio: provide of_iio_channel_get_by_name() and devm_ version it Dmitry Baryshkov
2020-09-14 15:48 ` [PATCH v5 7/9] thermal: qcom: add support for adc-tm5 PMIC thermal monitor Dmitry Baryshkov
2020-09-25 11:42 ` Jishnu Prakash
2020-09-14 15:48 ` [PATCH v5 8/9] arm64: dts: qcom: pm8150x: add definitions for adc-tm5 part Dmitry Baryshkov
2020-09-14 15:48 ` [PATCH v5 9/9] arm64: dts: sm8250-mtp: add thermal zones using pmic's adc-tm5 Dmitry Baryshkov
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