Re: [PATCH v5 2/2] iio: frequency: admfm2000: New driver

From: Crt Mori
Date: Fri Nov 24 2023 - 06:08:29 EST

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Acked-by: Crt Mori<cmo@xxxxxxxxxxx>

On Fri, 24 Nov 2023 at 11:51, Kim Seer Paller <kimseer.paller@xxxxxxxxxx> wrote:
>
> Dual microwave down converter module with input RF and LO frequency
> ranges from 0.5 to 32 GHz and an output IF frequency range from 0.1 to
> 8 GHz. It consists of a LNA, mixer, IF filter, DSA, and IF amplifier
> for each down conversion path.
>
> Signed-off-by: Kim Seer Paller <kimseer.paller@xxxxxxxxxx>
> ---
> V4 -> V5: Added missing return -ENODEV in setup function. Reordered variable
> declarations in probe function.
> V1 -> V4: No changes.
>
> MAINTAINERS | 1 +
> drivers/iio/frequency/Kconfig | 10 +
> drivers/iio/frequency/Makefile | 1 +
> drivers/iio/frequency/admfm2000.c | 310 ++++++++++++++++++++++++++++++
> 4 files changed, 322 insertions(+)
> create mode 100644 drivers/iio/frequency/admfm2000.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index f1692ec68..d8630e490 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1253,6 +1253,7 @@ L: linux-iio@xxxxxxxxxxxxxxx
> S: Supported
> W: https://ez.analog.com/linux-software-drivers
> F: Documentation/devicetree/bindings/iio/frequency/adi,admfm2000.yaml
> +F: drivers/iio/frequency/admfm2000.c
>
> ANALOG DEVICES INC ADMV1013 DRIVER
> M: Antoniu Miclaus <antoniu.miclaus@xxxxxxxxxx>
> diff --git a/drivers/iio/frequency/Kconfig b/drivers/iio/frequency/Kconfig
> index 9e85dfa58..c455be7d4 100644
> --- a/drivers/iio/frequency/Kconfig
> +++ b/drivers/iio/frequency/Kconfig
> @@ -60,6 +60,16 @@ config ADF4377
> To compile this driver as a module, choose M here: the
> module will be called adf4377.
>
> +config ADMFM2000
> + tristate "Analog Devices ADMFM2000 Dual Microwave Down Converter"
> + depends on GPIOLIB
> + help
> + Say yes here to build support for Analog Devices ADMFM2000 Dual
> + Microwave Down Converter.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called admfm2000.
> +
> config ADMV1013
> tristate "Analog Devices ADMV1013 Microwave Upconverter"
> depends on SPI && COMMON_CLK
> diff --git a/drivers/iio/frequency/Makefile b/drivers/iio/frequency/Makefile
> index b616c29b4..70d0e0b70 100644
> --- a/drivers/iio/frequency/Makefile
> +++ b/drivers/iio/frequency/Makefile
> @@ -8,6 +8,7 @@ obj-$(CONFIG_AD9523) += ad9523.o
> obj-$(CONFIG_ADF4350) += adf4350.o
> obj-$(CONFIG_ADF4371) += adf4371.o
> obj-$(CONFIG_ADF4377) += adf4377.o
> +obj-$(CONFIG_ADMFM2000) += admfm2000.o
> obj-$(CONFIG_ADMV1013) += admv1013.o
> obj-$(CONFIG_ADMV1014) += admv1014.o
> obj-$(CONFIG_ADMV4420) += admv4420.o
> diff --git a/drivers/iio/frequency/admfm2000.c b/drivers/iio/frequency/admfm2000.c
> new file mode 100644
> index 000000000..351fb9044
> --- /dev/null
> +++ b/drivers/iio/frequency/admfm2000.c
> @@ -0,0 +1,310 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * ADMFM2000 Dual Microwave Down Converter
> + *
> + * Copyright 2023 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/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/regulator/consumer.h>
> +
> +#define ADMFM2000_MIXER_MODE 0
> +#define ADMFM2000_DIRECT_IF_MODE 1
> +#define ADMF20000_DSA_GPIOS 5
> +#define ADMF20000_MODE_GPIOS 2
> +#define ADMF20000_MAX_GAIN 0
> +#define ADMF20000_MIN_GAIN -31000
> +#define ADMF20000_DEFAULT_GAIN -0x20
> +
> +struct admfm2000_state {
> + struct mutex lock; /* protect sensor state */
> + struct gpio_descs *sw_ch[2];
> + struct gpio_descs *dsa_gpios[2];
> + u32 gain[2];
> +};
> +
> +static int admfm2000_mode(struct iio_dev *indio_dev, u32 reg, u32 mode)
> +{
> + struct admfm2000_state *st = iio_priv(indio_dev);
> + DECLARE_BITMAP(values, 2);
> +
> + switch (mode) {
> + case ADMFM2000_MIXER_MODE:
> + values[0] = (reg == 0) ? 1 : 2;
> + gpiod_set_array_value_cansleep(st->sw_ch[reg]->ndescs,
> + st->sw_ch[reg]->desc,
> + NULL, values);
> + break;
> + case ADMFM2000_DIRECT_IF_MODE:
> + values[0] = (reg == 0) ? 2 : 1;
> + gpiod_set_array_value_cansleep(st->sw_ch[reg]->ndescs,
> + st->sw_ch[reg]->desc,
> + NULL, values);
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static int admfm2000_attenuation(struct iio_dev *indio_dev, u32 chan,
> + u32 value)
> +{
> + struct admfm2000_state *st = iio_priv(indio_dev);
> + DECLARE_BITMAP(values, BITS_PER_TYPE(value));
> +
> + values[0] = value;
> +
> + gpiod_set_array_value_cansleep(st->dsa_gpios[chan]->ndescs,
> + st->dsa_gpios[chan]->desc,
> + NULL, values);
> + return 0;
> +}
> +
> +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 > ADMF20000_MAX_GAIN || gain < ADMF20000_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);
> + if (ret)
> + return ret;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +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 fwnode_handle *child;
> + u32 reg, mode;
> + int ret;
> +
> + device_for_each_child_node(dev, child) {
> + ret = fwnode_property_read_u32(child, "reg", &reg);
> + if (ret) {
> + fwnode_handle_put(child);
> + return dev_err_probe(dev, ret,
> + "Failed to get reg property\n");
> + }
> +
> + if (reg >= indio_dev->num_channels) {
> + fwnode_handle_put(child);
> + return dev_err_probe(dev, -EINVAL, "reg bigger than: %d\n",
> + indio_dev->num_channels);
> + }
> +
> + ret = fwnode_property_read_u32(child, "adi,mode", &mode);
> + if (ret) {
> + fwnode_handle_put(child);
> + return dev_err_probe(dev, ret,
> + "Failed to get mode property\n");
> + }
> +
> + if (mode >= 2) {
> + fwnode_handle_put(child);
> + return dev_err_probe(dev, -EINVAL, "mode bigger than: 1\n");
> + }
> +
> + ret = admfm2000_mode(indio_dev, reg, mode);
> + if (ret) {
> + fwnode_handle_put(child);
> + return ret;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int admfm2000_setup(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;
> +
> + st->sw_ch[0] = devm_gpiod_get_array(dev, "switch1", GPIOD_OUT_LOW);
> + if (IS_ERR(st->sw_ch[0]))
> + return dev_err_probe(dev, PTR_ERR(st->sw_ch[0]),
> + "Failed to get gpios\n");
> +
> + if (st->sw_ch[0]->ndescs != ADMF20000_MODE_GPIOS) {
> + dev_err_probe(dev, -ENODEV, "%d GPIOs needed to operate\n",
> + ADMF20000_MODE_GPIOS);
> + return -ENODEV;
> + }
> +
> + st->sw_ch[1] = devm_gpiod_get_array(dev, "switch2", GPIOD_OUT_LOW);
> + if (IS_ERR(st->sw_ch[1]))
> + return dev_err_probe(dev, PTR_ERR(st->sw_ch[1]),
> + "Failed to get gpios\n");
> +
> + if (st->sw_ch[1]->ndescs != ADMF20000_MODE_GPIOS) {
> + dev_err_probe(dev, -ENODEV, "%d GPIOs needed to operate\n",
> + ADMF20000_MODE_GPIOS);
> + return -ENODEV;
> + }
> +
> + st->dsa_gpios[0] = devm_gpiod_get_array(dev, "attenuation1",
> + GPIOD_OUT_LOW);
> + if (IS_ERR(st->dsa_gpios[0]))
> + return dev_err_probe(dev, PTR_ERR(st->dsa_gpios[0]),
> + "Failed to get gpios\n");
> +
> + if (st->dsa_gpios[0]->ndescs != ADMF20000_DSA_GPIOS) {
> + dev_err_probe(dev, -ENODEV, "%d GPIOs needed to operate\n",
> + ADMF20000_DSA_GPIOS);
> + return -ENODEV;
> + }
> +
> + st->dsa_gpios[1] = devm_gpiod_get_array(dev, "attenuation2",
> + GPIOD_OUT_LOW);
> + if (IS_ERR(st->dsa_gpios[1]))
> + return dev_err_probe(dev, PTR_ERR(st->dsa_gpios[1]),
> + "Failed to get gpios\n");
> +
> + if (st->dsa_gpios[1]->ndescs != ADMF20000_DSA_GPIOS) {
> + dev_err_probe(dev, -ENODEV, "%d GPIOs needed to operate\n",
> + ADMF20000_DSA_GPIOS);
> + return -ENODEV;
> + }
> +
> + 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] = ADMF20000_DEFAULT_GAIN;
> + st->gain[1] = ADMF20000_DEFAULT_GAIN;
> +
> + mutex_init(&st->lock);
> +
> + ret = admfm2000_setup(st, indio_dev);
> + if (ret)
> + return ret;
> +
> + 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 <kimseer.paller@xxxxxxxxxx>");
> +MODULE_DESCRIPTION("ADMFM2000 Dual Microwave Down Converter");
> +MODULE_LICENSE("GPL");
> --
> 2.34.1
>

Next message: Andy Shevchenko: "Re: [PATCH v1 1/1] pinctrl: lynxpoint: Simplify code with cleanup helpers"
Previous message: Charan Teja Kalla: "[PATCH V3 2/2] mm: page_alloc: enforce minimum zone size to do high atomic reserves"
In reply to: Kim Seer Paller: "[PATCH v5 2/2] iio: frequency: admfm2000: New driver"
Next in thread: Jonathan Cameron: "Re: [PATCH v5 2/2] iio: frequency: admfm2000: New driver"
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