hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

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>
This commit is contained in:
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/iio/amplifiers/Kconfig
View File

@ -17,6 +17,7 @@ config AD8366
from Analog Devices:
AD8366 Dual-Digital Variable Gain Amplifier (VGA)
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
module will be called ad8366.

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

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