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: Sergiu Cuciurean <sergiu.cuciurean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/amplifiers/ad8366.c b/drivers/iio/amplifiers/ad8366.c
index 95972ab60f42e6ce6d30a79cc1f45813bbba6fbb..62167b87caea83471fd5b214a62393168063d8ab 100644 (file)
--- 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)
+ *   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);