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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
iio: amplifiers: adl8113: add driver support
Add support for adl8113 10MHz to 12GHz Low Noise Amplifier with
10MHz to 14GHz bypass switches.
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
authored by
Antoniu Miclaus
and committed by
Jonathan Cameron
b8c7340e
09140a72
+282
+12
drivers/iio/amplifiers/Kconfig
+12
drivers/iio/amplifiers/Kconfig
···
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To compile this driver as a module, choose M here: the
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module will be called ada4250.
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config ADL8113
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tristate "Analog Devices ADL8113 Low Noise Amplifier"
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depends on GPIOLIB
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help
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Say yes here to build support for Analog Devices ADL8113 Low Noise
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Amplifier with integrated bypass switches. The device supports four
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operation modes controlled by GPIO pins: internal amplifier,
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internal bypass, and two external bypass modes.
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To compile this driver as a module, choose M here: the
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module will be called adl8113.
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config HMC425
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tristate "Analog Devices HMC425A and similar GPIO Gain Amplifiers"
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depends on GPIOLIB
+1
drivers/iio/amplifiers/Makefile
+1
drivers/iio/amplifiers/Makefile
+269
drivers/iio/amplifiers/adl8113.c
+269
drivers/iio/amplifiers/adl8113.c
···
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// SPDX-License-Identifier: GPL-2.0
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/*
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* ADL8113 Low Noise Amplifier with integrated bypass switches
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*
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* Copyright 2025 Analog Devices Inc.
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*/
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#include <linux/array_size.h>
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#include <linux/bitmap.h>
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#include <linux/device/driver.h>
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#include <linux/dev_printk.h>
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#include <linux/err.h>
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#include <linux/gpio/consumer.h>
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#include <linux/iio/iio.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#include <linux/regulator/consumer.h>
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#include <linux/types.h>
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enum adl8113_signal_path {
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ADL8113_INTERNAL_AMP,
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ADL8113_INTERNAL_BYPASS,
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ADL8113_EXTERNAL_A,
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ADL8113_EXTERNAL_B,
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};
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struct adl8113_gain_config {
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enum adl8113_signal_path path;
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int gain_db;
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};
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struct adl8113_state {
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struct gpio_descs *gpios;
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struct adl8113_gain_config *gain_configs;
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unsigned int num_gain_configs;
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enum adl8113_signal_path current_path;
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};
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static const char * const adl8113_supply_names[] = {
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"vdd1",
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"vss2",
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"vdd2",
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};
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static int adl8113_set_path(struct adl8113_state *st,
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enum adl8113_signal_path path)
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{
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DECLARE_BITMAP(values, 2);
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int ret;
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/*
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* Determine GPIO values based on signal path.
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* Va: bit 0, Vb: bit 1.
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*/
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switch (path) {
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case ADL8113_INTERNAL_AMP:
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bitmap_write(values, 0x00, 0, 2);
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break;
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case ADL8113_INTERNAL_BYPASS:
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bitmap_write(values, 0x03, 0, 2);
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break;
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case ADL8113_EXTERNAL_A:
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bitmap_write(values, 0x02, 0, 2);
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break;
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case ADL8113_EXTERNAL_B:
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bitmap_write(values, 0x01, 0, 2);
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break;
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default:
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return -EINVAL;
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}
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ret = gpiod_set_array_value_cansleep(st->gpios->ndescs, st->gpios->desc,
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st->gpios->info, values);
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if (ret)
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return ret;
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st->current_path = path;
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return 0;
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}
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static int adl8113_find_gain_config(struct adl8113_state *st, int gain_db)
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{
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unsigned int i;
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for (i = 0; i < st->num_gain_configs; i++) {
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if (st->gain_configs[i].gain_db == gain_db)
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return i;
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}
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return -EINVAL;
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}
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static const struct iio_chan_spec adl8113_channels[] = {
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{
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.type = IIO_VOLTAGE,
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_HARDWAREGAIN),
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},
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};
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static int adl8113_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct adl8113_state *st = iio_priv(indio_dev);
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unsigned int i;
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switch (mask) {
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case IIO_CHAN_INFO_HARDWAREGAIN:
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/* Find current gain configuration */
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for (i = 0; i < st->num_gain_configs; i++) {
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if (st->gain_configs[i].path == st->current_path) {
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*val = st->gain_configs[i].gain_db;
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*val2 = 0;
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return IIO_VAL_INT_PLUS_MICRO_DB;
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}
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}
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return -EINVAL;
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default:
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return -EINVAL;
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}
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}
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static int adl8113_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val, int val2, long mask)
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{
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struct adl8113_state *st = iio_priv(indio_dev);
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int config_idx;
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switch (mask) {
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case IIO_CHAN_INFO_HARDWAREGAIN:
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if (val2 != 0)
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return -EINVAL;
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config_idx = adl8113_find_gain_config(st, val);
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if (config_idx < 0)
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return config_idx;
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return adl8113_set_path(st, st->gain_configs[config_idx].path);
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default:
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return -EINVAL;
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}
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}
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static const struct iio_info adl8113_info = {
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.read_raw = adl8113_read_raw,
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.write_raw = adl8113_write_raw,
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};
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static int adl8113_init_gain_configs(struct device *dev, struct adl8113_state *st)
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{
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int external_a_gain, external_b_gain;
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unsigned int i;
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/*
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* Allocate for all 4 possible paths:
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* - Internal amp and bypass (always present)
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* - External bypass A and B (optional if configured)
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*/
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st->gain_configs = devm_kcalloc(dev, 4, sizeof(*st->gain_configs),
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GFP_KERNEL);
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if (!st->gain_configs)
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return -ENOMEM;
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/* Start filling the gain configurations with data */
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i = 0;
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/* Always include internal amplifier (14dB) */
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st->gain_configs[i++] = (struct adl8113_gain_config) {
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.path = ADL8113_INTERNAL_AMP,
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.gain_db = 14,
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};
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/* Always include internal bypass (-2dB insertion loss) */
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st->gain_configs[i++] = (struct adl8113_gain_config) {
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.path = ADL8113_INTERNAL_BYPASS,
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.gain_db = -2,
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};
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/* Add external bypass A if configured */
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if (!device_property_read_u32(dev, "adi,external-bypass-a-gain-db",
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&external_a_gain)) {
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st->gain_configs[i++] = (struct adl8113_gain_config) {
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.path = ADL8113_EXTERNAL_A,
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.gain_db = external_a_gain,
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};
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}
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/* Add external bypass B if configured */
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if (!device_property_read_u32(dev, "adi,external-bypass-b-gain-db",
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&external_b_gain)) {
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st->gain_configs[i++] = (struct adl8113_gain_config) {
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.path = ADL8113_EXTERNAL_B,
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.gain_db = external_b_gain,
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};
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}
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st->num_gain_configs = i;
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return 0;
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}
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static int adl8113_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct adl8113_state *st;
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struct iio_dev *indio_dev;
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int ret;
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indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
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if (!indio_dev)
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return -ENOMEM;
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st = iio_priv(indio_dev);
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st->gpios = devm_gpiod_get_array(dev, "ctrl", GPIOD_OUT_LOW);
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if (IS_ERR(st->gpios))
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return dev_err_probe(dev, PTR_ERR(st->gpios),
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"failed to get control GPIOs\n");
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if (st->gpios->ndescs != 2)
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return dev_err_probe(dev, -EINVAL,
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"expected 2 control GPIOs, got %u\n",
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st->gpios->ndescs);
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ret = devm_regulator_bulk_get_enable(dev,
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ARRAY_SIZE(adl8113_supply_names),
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adl8113_supply_names);
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if (ret)
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return dev_err_probe(dev, ret,
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"failed to get and enable supplies\n");
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/* Initialize gain configurations from devicetree */
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ret = adl8113_init_gain_configs(dev, st);
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if (ret)
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return ret;
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/* Initialize to internal amplifier path (14dB) */
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ret = adl8113_set_path(st, ADL8113_INTERNAL_AMP);
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if (ret)
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return ret;
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indio_dev->info = &adl8113_info;
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indio_dev->name = "adl8113";
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indio_dev->channels = adl8113_channels;
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indio_dev->num_channels = ARRAY_SIZE(adl8113_channels);
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return devm_iio_device_register(dev, indio_dev);
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}
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static const struct of_device_id adl8113_of_match[] = {
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{ .compatible = "adi,adl8113" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, adl8113_of_match);
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static struct platform_driver adl8113_driver = {
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.driver = {
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.name = "adl8113",
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.of_match_table = adl8113_of_match,
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},
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.probe = adl8113_probe,
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};
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module_platform_driver(adl8113_driver);
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MODULE_AUTHOR("Antoniu Miclaus <antoniu.miclaus@analog.com>");
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MODULE_DESCRIPTION("Analog Devices ADL8113 Low Noise Amplifier");
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MODULE_LICENSE("GPL");