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/Linux-v6.1/Documentation/devicetree/bindings/iio/temperature/
Dadi,ltc2983.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Analog Devices LTC2983 Multi-sensor Temperature system
10 - Nuno Sá <nuno.sa@analog.com>
13 Analog Devices LTC2983 Multi-Sensor Digital Temperature Measurement System
14 https://www.analog.com/media/en/technical-documentation/data-sheets/2983fc.pdf
19 - adi,ltc2983
27 adi,mux-delay-config-us:
30 result. Each conversion cycle is performed with different excitation and
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/Linux-v6.1/Documentation/devicetree/bindings/iio/afe/
Dtemperature-sense-rtd.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/iio/afe/temperature-sense-rtd.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Liam Beguin <liambeguin@gmail.com>
17 When an io-channel measures the output voltage across an RTD such as a
25 T = 1 / (alpha * r0 * iexc) * (V - r0 * iexc)
30 -----
32 +---+----+
34 +---+----+
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/Linux-v6.1/drivers/iio/afe/
Diio-rescale.c1 // SPDX-License-Identifier: GPL-2.0
33 *val *= rescale->numerator; in rescale_process_scale()
34 if (rescale->denominator == 1) in rescale_process_scale()
36 *val2 = rescale->denominator; in rescale_process_scale()
44 if (!check_mul_overflow(*val, rescale->numerator, &_val) && in rescale_process_scale()
45 !check_mul_overflow(*val2, rescale->denominator, &_val2)) { in rescale_process_scale()
53 tmp = div_s64(tmp, rescale->denominator); in rescale_process_scale()
54 tmp *= rescale->numerator; in rescale_process_scale()
82 * *val = 1 and *val2 = -0.5 yields -1.5 not -0.5. in rescale_process_scale()
86 tmp = (s64)abs(*val) * abs(rescale->numerator); in rescale_process_scale()
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/Linux-v6.1/drivers/iio/temperature/
Dltc2983.c1 // SPDX-License-Identifier: GPL-2.0
3 * Analog Devices LTC2983 Multi-Sensor Digital Temperature Measurement System
46 (((chan - 1) * 4) + LTC2983_CHAN_ASSIGN_START_REG)
48 (((chan - 1) * 4) + LTC2983_TEMP_RES_START_REG)
278 * instance a resolution of 2^-10 means we have 10 fractional bits.
292 s64 __res = -(s32)val; in __convert_to_raw_sign()
296 return (u32)-__res; in __convert_to_raw_sign()
303 const struct device *dev = &st->spi->dev; in __ltc2983_fault_handler()
307 return -EIO; in __ltc2983_fault_handler()
320 u32 reg = LTC2983_CHAN_START_ADDR(sensor->chan); in __ltc2983_chan_assign_common()
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