summaryrefslogtreecommitdiff
path: root/drivers/iio/amplifiers
diff options
context:
space:
mode:
authorAlexandru Ardelean <alexandru.ardelean@analog.com>2019-05-30 16:18:12 +0300
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2019-06-17 23:06:48 +0300
commit075da9cd6aa503e05c86f2bbd29b539d1b145644 (patch)
tree2a93d71f81b2d2d8dff2f196eacd0e956fe2d929 /drivers/iio/amplifiers
parentcee211f4e5a0f70ee0c202e9a5fc8eac0b9b4945 (diff)
downloadlinux-075da9cd6aa503e05c86f2bbd29b539d1b145644.tar.xz
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>
Diffstat (limited to 'drivers/iio/amplifiers')
-rw-r--r--drivers/iio/amplifiers/Kconfig1
-rw-r--r--drivers/iio/amplifiers/ad8366.c17
2 files changed, 18 insertions, 0 deletions
diff --git a/drivers/iio/amplifiers/Kconfig b/drivers/iio/amplifiers/Kconfig
index f39c05677d52..da7f126d197b 100644
--- a/drivers/iio/amplifiers/Kconfig
+++ b/drivers/iio/amplifiers/Kconfig
@@ -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.
diff --git a/drivers/iio/amplifiers/ad8366.c b/drivers/iio/amplifiers/ad8366.c
index 0a9883e8eb2e..0176d3d8cc9c 100644
--- a/drivers/iio/amplifiers/ad8366.c
+++ b/drivers/iio/amplifiers/ad8366.c
@@ -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);