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Message-ID: <20230721121038.183404-1-kimseer.paller@analog.com>
Date: Fri, 21 Jul 2023 20:10:38 +0800
From: Kim Seer Paller <kimseer.paller@...log.com>
To: unlisted-recipients:; (no To-header on input)
CC: Lars-Peter Clausen <lars@...afoo.de>,
Michael Hennerich <Michael.Hennerich@...log.com>,
Jonathan Cameron <jic23@...nel.org>,
<linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
Kim Seer Paller <kimseer.paller@...log.com>
Subject: [PATCH] iio: amplifiers: ad8366: add support for HMC792A Attenuator
This change adds support for the HMC792A Digital Attenuator. The
HMC792A is a broadband 6-bit GaAs MMIC Digital Attenuator operating
from DC to 6.0 GHz with 15.75 dB attenuation control range in 0.25 dB steps.
Datasheet link:
https://www.analog.com/media/en/technical-documentation/data-sheets/hmc792a.pdf
Signed-off-by: Kim Seer Paller <kimseer.paller@...log.com>
---
drivers/iio/amplifiers/Kconfig | 1 +
drivers/iio/amplifiers/ad8366.c | 15 +++++++++++++++
2 files changed, 16 insertions(+)
diff --git a/drivers/iio/amplifiers/Kconfig b/drivers/iio/amplifiers/Kconfig
index f217a2a1e..b54fe0173 100644
--- a/drivers/iio/amplifiers/Kconfig
+++ b/drivers/iio/amplifiers/Kconfig
@@ -18,6 +18,7 @@ config AD8366
AD8366 Dual-Digital Variable Gain Amplifier (VGA)
ADA4961 BiCMOS RF Digital Gain Amplifier (DGA)
ADL5240 Digitally controlled variable gain amplifier (VGA)
+ HMC792A 0.25 dB LSB GaAs MMIC 6-Bit Digital Attenuator
HMC1119 0.25 dB LSB, 7-Bit, Silicon Digital Attenuator
To compile this driver as a module, choose M here: the
diff --git a/drivers/iio/amplifiers/ad8366.c b/drivers/iio/amplifiers/ad8366.c
index 8d8c8ea94..31564afb1 100644
--- a/drivers/iio/amplifiers/ad8366.c
+++ b/drivers/iio/amplifiers/ad8366.c
@@ -5,6 +5,7 @@
* AD8366 Dual-Digital Variable Gain Amplifier (VGA)
* ADA4961 BiCMOS RF Digital Gain Amplifier (DGA)
* ADL5240 Digitally controlled variable gain amplifier (VGA)
+ * HMC792A 0.25 dB LSB GaAs MMIC 6-Bit Digital Attenuator
* HMC1119 0.25 dB LSB, 7-Bit, Silicon Digital Attenuator
*
* Copyright 2012-2019 Analog Devices Inc.
@@ -28,6 +29,7 @@ enum ad8366_type {
ID_AD8366,
ID_ADA4961,
ID_ADL5240,
+ ID_HMC792,
ID_HMC1119,
};
@@ -64,6 +66,10 @@ static struct ad8366_info ad8366_infos[] = {
.gain_min = -11500,
.gain_max = 20000,
},
+ [ID_HMC792] = {
+ .gain_min = -15750,
+ .gain_max = 0,
+ },
[ID_HMC1119] = {
.gain_min = -31750,
.gain_max = 0,
@@ -90,6 +96,7 @@ static int ad8366_write(struct iio_dev *indio_dev,
case ID_ADL5240:
st->data[0] = (ch_a & 0x3F);
break;
+ case ID_HMC792:
case ID_HMC1119:
st->data[0] = ch_a;
break;
@@ -127,6 +134,9 @@ static int ad8366_read_raw(struct iio_dev *indio_dev,
case ID_ADL5240:
gain = 20000 - 31500 + code * 500;
break;
+ case ID_HMC792:
+ gain = -1 * code * 500;
+ break;
case ID_HMC1119:
gain = -1 * code * 250;
break;
@@ -176,6 +186,9 @@ static int ad8366_write_raw(struct iio_dev *indio_dev,
case ID_ADL5240:
code = ((gain - 500 - 20000) / 500) & 0x3F;
break;
+ case ID_HMC792:
+ code = (abs(gain) / 500) & 0x3F;
+ break;
case ID_HMC1119:
code = (abs(gain) / 250) & 0x7F;
break;
@@ -261,6 +274,7 @@ static int ad8366_probe(struct spi_device *spi)
break;
case ID_ADA4961:
case ID_ADL5240:
+ case ID_HMC792:
case ID_HMC1119:
st->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(st->reset_gpio)) {
@@ -314,6 +328,7 @@ static const struct spi_device_id ad8366_id[] = {
{"ad8366", ID_AD8366},
{"ada4961", ID_ADA4961},
{"adl5240", ID_ADL5240},
+ {"hmc792a", ID_HMC792},
{"hmc1119", ID_HMC1119},
{}
};
base-commit: f7e3a1bafdea735050dfde00523cf505dc7fd309
--
2.34.1
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