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path: root/drivers/iio/amplifiers/ad8366.c
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Diffstat (limited to 'drivers/iio/amplifiers/ad8366.c')
-rw-r--r--drivers/iio/amplifiers/ad8366.c146
1 files changed, 119 insertions, 27 deletions
diff --git a/drivers/iio/amplifiers/ad8366.c b/drivers/iio/amplifiers/ad8366.c
index 3d6246f86429..0176d3d8cc9c 100644
--- a/drivers/iio/amplifiers/ad8366.c
+++ b/drivers/iio/amplifiers/ad8366.c
@@ -1,8 +1,12 @@
-// SPDX-License-Identifier: GPL-2.0-only
+// SPDX-License-Identifier: GPL-2.0
/*
- * AD8366 SPI Dual-Digital Variable Gain Amplifier (VGA)
+ * AD8366 and similar Gain Amplifiers
+ * 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 Analog Devices Inc.
+ * Copyright 2012-2019 Analog Devices Inc.
*/
#include <linux/device.h>
@@ -11,6 +15,7 @@
#include <linux/sysfs.h>
#include <linux/spi/spi.h>
#include <linux/regulator/consumer.h>
+#include <linux/gpio/consumer.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/bitrev.h>
@@ -18,10 +23,25 @@
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
+enum ad8366_type {
+ ID_AD8366,
+ ID_ADA4961,
+ ID_ADL5240,
+};
+
+struct ad8366_info {
+ int gain_min;
+ int gain_max;
+};
+
struct ad8366_state {
struct spi_device *spi;
struct regulator *reg;
+ struct mutex lock; /* protect sensor state */
+ struct gpio_desc *reset_gpio;
unsigned char ch[2];
+ enum ad8366_type type;
+ struct ad8366_info *info;
/*
* DMA (thus cache coherency maintenance) requires the
* transfer buffers to live in their own cache lines.
@@ -29,19 +49,44 @@ struct ad8366_state {
unsigned char data[2] ____cacheline_aligned;
};
+static struct ad8366_info ad8366_infos[] = {
+ [ID_AD8366] = {
+ .gain_min = 4500,
+ .gain_max = 20500,
+ },
+ [ID_ADA4961] = {
+ .gain_min = -6000,
+ .gain_max = 15000,
+ },
+ [ID_ADL5240] = {
+ .gain_min = -11500,
+ .gain_max = 20000,
+ },
+};
+
static int ad8366_write(struct iio_dev *indio_dev,
unsigned char ch_a, unsigned char ch_b)
{
struct ad8366_state *st = iio_priv(indio_dev);
int ret;
- ch_a = bitrev8(ch_a & 0x3F);
- ch_b = bitrev8(ch_b & 0x3F);
+ switch (st->type) {
+ case ID_AD8366:
+ ch_a = bitrev8(ch_a & 0x3F);
+ ch_b = bitrev8(ch_b & 0x3F);
- st->data[0] = ch_b >> 4;
- st->data[1] = (ch_b << 4) | (ch_a >> 2);
+ st->data[0] = ch_b >> 4;
+ st->data[1] = (ch_b << 4) | (ch_a >> 2);
+ break;
+ 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, ARRAY_SIZE(st->data));
+ ret = spi_write(st->spi, st->data, indio_dev->num_channels);
if (ret < 0)
dev_err(&indio_dev->dev, "write failed (%d)", ret);
@@ -56,24 +101,35 @@ static int ad8366_read_raw(struct iio_dev *indio_dev,
{
struct ad8366_state *st = iio_priv(indio_dev);
int ret;
- unsigned code;
+ int code, gain = 0;
- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&st->lock);
switch (m) {
case IIO_CHAN_INFO_HARDWAREGAIN:
code = st->ch[chan->channel];
+ switch (st->type) {
+ case ID_AD8366:
+ gain = code * 253 + 4500;
+ break;
+ case ID_ADA4961:
+ gain = 15000 - code * 1000;
+ break;
+ case ID_ADL5240:
+ gain = 20000 - 31500 + code * 500;
+ break;
+ }
+
/* Values in dB */
- code = code * 253 + 4500;
- *val = code / 1000;
- *val2 = (code % 1000) * 1000;
+ *val = gain / 1000;
+ *val2 = (gain % 1000) * 1000;
ret = IIO_VAL_INT_PLUS_MICRO_DB;
break;
default:
ret = -EINVAL;
}
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&st->lock);
return ret;
};
@@ -85,21 +141,32 @@ static int ad8366_write_raw(struct iio_dev *indio_dev,
long mask)
{
struct ad8366_state *st = iio_priv(indio_dev);
- unsigned code;
+ struct ad8366_info *inf = st->info;
+ int code = 0, gain;
int ret;
- if (val < 0 || val2 < 0)
- return -EINVAL;
-
/* Values in dB */
- code = (((u8)val * 1000) + ((u32)val2 / 1000));
+ if (val < 0)
+ gain = (val * 1000) - (val2 / 1000);
+ else
+ gain = (val * 1000) + (val2 / 1000);
- if (code > 20500 || code < 4500)
+ if (gain > inf->gain_max || gain < inf->gain_min)
return -EINVAL;
- code = (code - 4500) / 253;
+ switch (st->type) {
+ case ID_AD8366:
+ code = (gain - 4500) / 253;
+ break;
+ case ID_ADA4961:
+ code = (15000 - gain) / 1000;
+ break;
+ case ID_ADL5240:
+ code = ((gain - 500 - 20000) / 500) & 0x3F;
+ break;
+ }
- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&st->lock);
switch (mask) {
case IIO_CHAN_INFO_HARDWAREGAIN:
st->ch[chan->channel] = code;
@@ -108,7 +175,7 @@ static int ad8366_write_raw(struct iio_dev *indio_dev,
default:
ret = -EINVAL;
}
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&st->lock);
return ret;
}
@@ -131,6 +198,10 @@ static const struct iio_chan_spec ad8366_channels[] = {
AD8366_CHAN(1),
};
+static const struct iio_chan_spec ada4961_channels[] = {
+ AD8366_CHAN(0),
+};
+
static int ad8366_probe(struct spi_device *spi)
{
struct iio_dev *indio_dev;
@@ -151,14 +222,33 @@ static int ad8366_probe(struct spi_device *spi)
}
spi_set_drvdata(spi, indio_dev);
+ mutex_init(&st->lock);
st->spi = spi;
+ st->type = spi_get_device_id(spi)->driver_data;
+
+ switch (st->type) {
+ case ID_AD8366:
+ indio_dev->channels = ad8366_channels;
+ 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;
+ indio_dev->num_channels = ARRAY_SIZE(ada4961_channels);
+ break;
+ default:
+ dev_err(&spi->dev, "Invalid device ID\n");
+ ret = -EINVAL;
+ goto error_disable_reg;
+ }
+ st->info = &ad8366_infos[st->type];
indio_dev->dev.parent = &spi->dev;
indio_dev->name = spi_get_device_id(spi)->name;
indio_dev->info = &ad8366_info;
indio_dev->modes = INDIO_DIRECT_MODE;
- indio_dev->channels = ad8366_channels;
- indio_dev->num_channels = ARRAY_SIZE(ad8366_channels);
ret = ad8366_write(indio_dev, 0 , 0);
if (ret < 0)
@@ -192,7 +282,9 @@ static int ad8366_remove(struct spi_device *spi)
}
static const struct spi_device_id ad8366_id[] = {
- {"ad8366", 0},
+ {"ad8366", ID_AD8366},
+ {"ada4961", ID_ADA4961},
+ {"adl5240", ID_ADL5240},
{}
};
MODULE_DEVICE_TABLE(spi, ad8366_id);
@@ -209,5 +301,5 @@ static struct spi_driver ad8366_driver = {
module_spi_driver(ad8366_driver);
MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
-MODULE_DESCRIPTION("Analog Devices AD8366 VGA");
+MODULE_DESCRIPTION("Analog Devices AD8366 and similar Gain Amplifiers");
MODULE_LICENSE("GPL v2");
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.