Commit cc74a38d authored by Sergiu Cuciurean's avatar Sergiu Cuciurean Committed by Jonathan Cameron
Browse files

iio: amplifiers: ad8366: add support for HMC1119 Attenuator 

This change adds support for the HMC1119 Silicon Digial Attenuator. The
HMC1119 is a broadband, highly accurate, 7-bit digital attenuator,
operating from 0.1 GHz to 6.0 GHz with 31.5 dB attenuation control range
in 0.25 dB steps.

Link: https://www.analog.com/media/en/technical-documentation/data-sheets/hmc1119.pdf



Signed-off-by: default avatarSergiu Cuciurean <sergiu.cuciurean@analog.com>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 328b50e9

drivers/iio/amplifiers/ad8366.c

+17 −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)

 *   HMC1119 0.25 dB LSB, 7-Bit, Silicon Digital Attenuator

 *

 * Copyright 2012-2019 Analog Devices Inc.

 */
@@ -27,6 +28,7 @@ enum ad8366_type { 
	ID_AD8366,

	ID_ADA4961,

	ID_ADL5240,

	ID_HMC1119,

};



struct ad8366_info {
@@ -62,6 +64,10 @@ static struct ad8366_info ad8366_infos[] = { 
		.gain_min = -11500,

		.gain_max = 20000,

	},

	[ID_HMC1119] = {

		.gain_min = -31750,

		.gain_max = 0,

	},

};



static int ad8366_write(struct iio_dev *indio_dev,
@@ -84,6 +90,9 @@ static int ad8366_write(struct iio_dev *indio_dev, 
	case ID_ADL5240:

		st->data[0] = (ch_a & 0x3F);

		break;

	case ID_HMC1119:

		st->data[0] = ch_a;

		break;

	}



	ret = spi_write(st->spi, st->data, indio_dev->num_channels);
@@ -118,6 +127,9 @@ static int ad8366_read_raw(struct iio_dev *indio_dev, 
		case ID_ADL5240:

			gain = 20000 - 31500 + code * 500;

			break;

		case ID_HMC1119:

			gain = -1 * code * 250;

			break;

		}



		/* Values in dB */
@@ -164,6 +176,9 @@ static int ad8366_write_raw(struct iio_dev *indio_dev, 
	case ID_ADL5240:

		code = ((gain - 500 - 20000) / 500) & 0x3F;

		break;

	case ID_HMC1119:

		code = (abs(gain) / 250) & 0x7F;

		break;

	}



	mutex_lock(&st->lock);
@@ -246,6 +261,7 @@ static int ad8366_probe(struct spi_device *spi) 
		break;

	case ID_ADA4961:

	case ID_ADL5240:

	case ID_HMC1119:

		st->reset_gpio = devm_gpiod_get(&spi->dev, "reset",

			GPIOD_OUT_HIGH);

		indio_dev->channels = ada4961_channels;
@@ -298,6 +314,7 @@ static const struct spi_device_id ad8366_id[] = { 
	{"ad8366",  ID_AD8366},

	{"ada4961", ID_ADA4961},

	{"adl5240", ID_ADL5240},

	{"hmc1119", ID_HMC1119},

	{}

};

MODULE_DEVICE_TABLE(spi, ad8366_id);

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