// SPDX-License-Identifier: GPL-2.0
/*
* ADMFM2000 Dual Microwave Down Converter
*
* Copyright 2024 Analog Devices Inc.
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/iio/iio.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#define ADMFM2000_MIXER_MODE 0
#define ADMFM2000_DIRECT_IF_MODE 1
#define ADMFM2000_DSA_GPIOS 5
#define ADMFM2000_MODE_GPIOS 2
#define ADMFM2000_MAX_GAIN 0
#define ADMFM2000_MIN_GAIN -31000
#define ADMFM2000_DEFAULT_GAIN -0x20
struct admfm2000_state {
struct mutex lock; /* protect sensor state */
struct gpio_desc *sw1_ch[2];
struct gpio_desc *sw2_ch[2];
struct gpio_desc *dsa1_gpios[5];
struct gpio_desc *dsa2_gpios[5];
u32 gain[2];
};
static int admfm2000_mode(struct iio_dev *indio_dev, u32 chan, u32 mode)
{
struct admfm2000_state *st = iio_priv(indio_dev);
int i;
switch (mode) {
case ADMFM2000_MIXER_MODE:
for (i = 0; i < ADMFM2000_MODE_GPIOS; i++) {
gpiod_set_value_cansleep(st->sw1_ch[i], (chan == 0) ? 1 : 0);
gpiod_set_value_cansleep(st->sw2_ch[i], (chan == 0) ? 0 : 1);
}
return 0;
case ADMFM2000_DIRECT_IF_MODE:
for (i = 0; i < ADMFM2000_MODE_GPIOS; i++) {
gpiod_set_value_cansleep(st->sw1_ch[i], (chan == 0) ? 0 : 1);
gpiod_set_value_cansleep(st->sw2_ch[i], (chan == 0) ? 1 : 0);
}
return 0;
default:
return -EINVAL;
}
}
static int admfm2000_attenuation(struct iio_dev *indio_dev, u32 chan, u32 value)
{
struct admfm2000_state *st = iio_priv(indio_dev);
int i;
switch (chan) {
case 0:
for (i = 0; i < ADMFM2000_DSA_GPIOS; i++)
gpiod_set_value_cansleep(st->dsa1_gpios[i], value & (1 << i));
return 0;
case 1:
for (i = 0; i < ADMFM2000_DSA_GPIOS; i++)
gpiod_set_value_cansleep(st->dsa2_gpios[i], value & (1 << i));
return 0;
default:
return -EINVAL;
}
}
static int admfm2000_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int *val,
int *val2, long mask)
{
struct admfm2000_state *st = iio_priv(indio_dev);
int gain;
switch (mask) {
case IIO_CHAN_INFO_HARDWAREGAIN:
mutex_lock(&st->lock);
gain = ~(st->gain[chan->channel]) * -1000;
*val = gain / 1000;
*val2 = (gain % 1000) * 1000;
mutex_unlock(&st->lock);
return IIO_VAL_INT_PLUS_MICRO_DB;
default:
return -EINVAL;
}
}
static int admfm2000_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int val,
int val2, long mask)
{
struct admfm2000_state *st = iio_priv(indio_dev);
int gain, ret;
if (val < 0)
gain = (val * 1000) - (val2 / 1000);
else
gain = (val * 1000) + (val2 / 1000);
if (gain > ADMFM2000_MAX_GAIN || gain < ADMFM2000_MIN_GAIN)
return -EINVAL;
switch (mask) {
case IIO_CHAN_INFO_HARDWAREGAIN:
mutex_lock(&st->lock);
st->gain[chan->channel] = ~((abs(gain) / 1000) & 0x1F);
ret = admfm2000_attenuation(indio_dev, chan->channel,
st->gain[chan->channel]);
mutex_unlock(&st->lock);
return ret;
default:
return -EINVAL;
}
}
static int admfm2000_write_raw_get_fmt(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
long mask)
{
switch (mask) {
case IIO_CHAN_INFO_HARDWAREGAIN:
return IIO_VAL_INT_PLUS_MICRO_DB;
default:
return -EINVAL;
}
}
static const struct iio_info admfm2000_info = {
.read_raw = &admfm2000_read_raw,
.write_raw = &admfm2000_write_raw,
.write_raw_get_fmt = &admfm2000_write_raw_get_fmt,
};
#define ADMFM2000_CHAN(_channel) { \
.type = IIO_VOLTAGE, \
.output = 1, \
.indexed = 1, \
.channel = _channel, \
.info_mask_separate = BIT(IIO_CHAN_INFO_HARDWAREGAIN), \
}
static const struct iio_chan_spec admfm2000_channels[] = {
ADMFM2000_CHAN(0),
ADMFM2000_CHAN(1),
};
static int admfm2000_channel_config(struct admfm2000_state *st,
struct iio_dev *indio_dev)
{
struct platform_device *pdev = to_platform_device(indio_dev->dev.parent);
struct device *dev = &pdev->dev;
struct gpio_desc **dsa;
struct gpio_desc **sw;
int ret, i;
bool mode;
u32 reg;
device_for_each_child_node_scoped(dev, child) {
ret = fwnode_property_read_u32(child, "reg", ®);
if (ret)
return dev_err_probe(dev, ret,
"Failed to get reg property\n");
if (reg >= indio_dev->num_channels)
return dev_err_probe(dev, -EINVAL, "reg bigger than: %d\n",
indio_dev->num_channels);
if (fwnode_property_present(child, "adi,mixer-mode"))
mode = ADMFM2000_MIXER_MODE;
else
mode = ADMFM2000_DIRECT_IF_MODE;
switch (reg) {
case 0:
sw = st->sw1_ch;
dsa = st->dsa1_gpios;
break;
case 1:
sw = st->sw2_ch;
dsa = st->dsa2_gpios;
break;
default:
return -EINVAL;
}
for (i = 0; i < ADMFM2000_MODE_GPIOS; i++) {
sw[i] = devm_fwnode_gpiod_get_index(dev, child, "switch",
i, GPIOD_OUT_LOW, NULL);
if (IS_ERR(sw[i]))
return dev_err_probe(dev, PTR_ERR(sw[i]),
"Failed to get gpios\n");
}
for (i = 0; i < ADMFM2000_DSA_GPIOS; i++) {
dsa[i] = devm_fwnode_gpiod_get_index(dev, child,
"attenuation", i,
GPIOD_OUT_LOW, NULL);
if (IS_ERR(dsa[i]))
return dev_err_probe(dev, PTR_ERR(dsa[i]),
"Failed to get gpios\n");
}
ret = admfm2000_mode(indio_dev, reg, mode);
if (ret)
return ret;
}
return 0;
}
static int admfm2000_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct admfm2000_state *st;
struct iio_dev *indio_dev;
int ret;
indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
if (!indio_dev)
return -ENOMEM;
st = iio_priv(indio_dev);
indio_dev->name = "admfm2000";
indio_dev->num_channels = ARRAY_SIZE(admfm2000_channels);
indio_dev->channels = admfm2000_channels;
indio_dev->info = &admfm2000_info;
indio_dev->modes = INDIO_DIRECT_MODE;
st->gain[0] = ADMFM2000_DEFAULT_GAIN;
st->gain[1] = ADMFM2000_DEFAULT_GAIN;
mutex_init(&st->lock);
ret = admfm2000_channel_config(st, indio_dev);
if (ret)
return ret;
return devm_iio_device_register(dev, indio_dev);
}
static const struct of_device_id admfm2000_of_match[] = {
{ .compatible = "adi,admfm2000" },
{ }
};
MODULE_DEVICE_TABLE(of, admfm2000_of_match);
static struct platform_driver admfm2000_driver = {
.driver = {
.name = "admfm2000",
.of_match_table = admfm2000_of_match,
},
.probe = admfm2000_probe,
};
module_platform_driver(admfm2000_driver);
MODULE_AUTHOR("Kim Seer Paller <[email protected]>");
MODULE_DESCRIPTION("ADMFM2000 Dual Microwave Down Converter");
MODULE_LICENSE("GPL");
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