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iio: amplifiers: ad8366: Add support for ADL5240 VGA 

The ADL5240 is a high performance, digitally controlled variable gain
amplifier (VGA) operating from 100 MHz to 4000 MHz. The VGA integrates a
high performance, 20 dB gain, internally matched amplifier (AMP) with a
6-bit digital step attenuator (DSA) that has a gain control range of
31.5 dB in 0.5 dB steps with ±0.25 dB step accuracy.

Datasheet link:
  https://www.analog.com/media/en/technical-documentation/data-sheets/adl5240.pdf

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
alistair/sunxi64-5.4-dsi
Alexandru Ardelean 2019-05-30 16:18:12 +03:00 committed by Jonathan Cameron
parent cee211f4e5
commit 075da9cd6a
2 changed files with 18 additions and 0 deletions
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1
drivers/iio/amplifiers/Kconfig
View File

@ -17,6 +17,7 @@ config AD8366
from Analog Devices: from Analog Devices:
AD8366 Dual-Digital Variable Gain Amplifier (VGA) AD8366 Dual-Digital Variable Gain Amplifier (VGA)
ADA4961 BiCMOS RF Digital Gain Amplifier (DGA) ADA4961 BiCMOS RF Digital Gain Amplifier (DGA)
ADL5240 Digitally controlled variable gain amplifier (VGA)
To compile this driver as a module, choose M here: the To compile this driver as a module, choose M here: the
module will be called ad8366. module will be called ad8366.

17
drivers/iio/amplifiers/ad8366.c
View File

@ -4,6 +4,7 @@
* This driver supports the following gain amplifiers: * This driver supports the following gain amplifiers:
* AD8366 Dual-Digital Variable Gain Amplifier (VGA) * AD8366 Dual-Digital Variable Gain Amplifier (VGA)
* ADA4961 BiCMOS RF Digital Gain Amplifier (DGA) * ADA4961 BiCMOS RF Digital Gain Amplifier (DGA)
* ADL5240 Digitally controlled variable gain amplifier (VGA)
* *
* Copyright 2012-2019 Analog Devices Inc. * Copyright 2012-2019 Analog Devices Inc.
*/ */
@ -25,6 +26,7 @@
enum ad8366_type { enum ad8366_type {
ID_AD8366, ID_AD8366,
ID_ADA4961, ID_ADA4961,
ID_ADL5240,
}; };
struct ad8366_info { struct ad8366_info {
@ -56,6 +58,10 @@ static struct ad8366_info ad8366_infos[] = {
.gain_min = -6000, .gain_min = -6000,
.gain_max = 15000, .gain_max = 15000,
}, },
[ID_ADL5240] = {
.gain_min = -11500,
.gain_max = 20000,
},
}; };
static int ad8366_write(struct iio_dev *indio_dev, static int ad8366_write(struct iio_dev *indio_dev,
@ -75,6 +81,9 @@ static int ad8366_write(struct iio_dev *indio_dev,
case ID_ADA4961: case ID_ADA4961:
st->data[0] = ch_a & 0x1F; st->data[0] = ch_a & 0x1F;
break; break;
case ID_ADL5240:
st->data[0] = (ch_a & 0x3F);
break;
} }
ret = spi_write(st->spi, st->data, indio_dev->num_channels); ret = spi_write(st->spi, st->data, indio_dev->num_channels);
@ -106,6 +115,9 @@ static int ad8366_read_raw(struct iio_dev *indio_dev,
case ID_ADA4961: case ID_ADA4961:
gain = 15000 - code * 1000; gain = 15000 - code * 1000;
break; break;
case ID_ADL5240:
gain = 20000 - 31500 + code * 500;
break;
} }
/* Values in dB */ /* Values in dB */
@ -149,6 +161,9 @@ static int ad8366_write_raw(struct iio_dev *indio_dev,
case ID_ADA4961: case ID_ADA4961:
code = (15000 - gain) / 1000; code = (15000 - gain) / 1000;
break; break;
case ID_ADL5240:
code = ((gain - 500 - 20000) / 500) & 0x3F;
break;
} }
mutex_lock(&st->lock); mutex_lock(&st->lock);
@ -217,6 +232,7 @@ static int ad8366_probe(struct spi_device *spi)
indio_dev->num_channels = ARRAY_SIZE(ad8366_channels); indio_dev->num_channels = ARRAY_SIZE(ad8366_channels);
break; break;
case ID_ADA4961: case ID_ADA4961:
case ID_ADL5240:
st->reset_gpio = devm_gpiod_get(&spi->dev, "reset", st->reset_gpio = devm_gpiod_get(&spi->dev, "reset",
GPIOD_OUT_HIGH); GPIOD_OUT_HIGH);
indio_dev->channels = ada4961_channels; indio_dev->channels = ada4961_channels;
@ -268,6 +284,7 @@ static int ad8366_remove(struct spi_device *spi)
static const struct spi_device_id ad8366_id[] = { static const struct spi_device_id ad8366_id[] = {
{"ad8366", ID_AD8366}, {"ad8366", ID_AD8366},
{"ada4961", ID_ADA4961}, {"ada4961", ID_ADA4961},
{"adl5240", ID_ADL5240},
{} {}
}; };
MODULE_DEVICE_TABLE(spi, ad8366_id); MODULE_DEVICE_TABLE(spi, ad8366_id);