Commit 247d3b63 authored by Kim Seer Paller's avatar Kim Seer Paller Committed by Jonathan Cameron
Browse files

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: https://www.analog.com/media/en/technical-documentation/data-sheets/hmc792a.pdf


Signed-off-by: default avatarKim Seer Paller <kimseer.paller@analog.com>
Link: https://lore.kernel.org/r/20230721121038.183404-1-kimseer.paller@analog.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent b662f4ba

drivers/iio/amplifiers/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/iio/amplifiers/ad8366.c

+15 −0
Original line number Diff line number Diff line
@@ -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},

	{}

};