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Message-ID: <20251121095204.18574-3-antoniu.miclaus@analog.com>
Date: Fri, 21 Nov 2025 09:52:03 +0000
From: Antoniu Miclaus <antoniu.miclaus@...log.com>
To: <jic23@...nel.org>, <robh@...nel.org>, <conor+dt@...nel.org>,
<linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<devicetree@...r.kernel.org>
CC: Antoniu Miclaus <antoniu.miclaus@...log.com>
Subject: [PATCH v4 2/2] 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@...log.com>
---
Changes in v4:
- Replace signal_path sysfs attribute with hardwaregain-only control
- Add support for external bypass amplifiers via DT properties
- Introduce dynamic gain configuration system with adl8113_gain_config structure
---
drivers/iio/amplifiers/Kconfig | 12 ++
drivers/iio/amplifiers/Makefile | 1 +
drivers/iio/amplifiers/adl8113.c | 277 +++++++++++++++++++++++++++++++
3 files changed, 290 insertions(+)
create mode 100644 drivers/iio/amplifiers/adl8113.c
diff --git a/drivers/iio/amplifiers/Kconfig b/drivers/iio/amplifiers/Kconfig
index 55eb16b32f6c..a8a604863eed 100644
--- a/drivers/iio/amplifiers/Kconfig
+++ b/drivers/iio/amplifiers/Kconfig
@@ -36,6 +36,18 @@ config ADA4250
To compile this driver as a module, choose M here: the
module will be called ada4250.
+config ADL8113
+ tristate "Analog Devices ADL8113 Low Noise Amplifier"
+ depends on GPIOLIB
+ help
+ Say yes here to build support for Analog Devices ADL8113 Low Noise
+ Amplifier with integrated bypass switches. The device supports four
+ operation modes controlled by GPIO pins: internal amplifier,
+ internal bypass, and two external bypass modes.
+
+ To compile this driver as a module, choose M here: the
+ module will be called adl8113.
+
config HMC425
tristate "Analog Devices HMC425A and similar GPIO Gain Amplifiers"
depends on GPIOLIB
diff --git a/drivers/iio/amplifiers/Makefile b/drivers/iio/amplifiers/Makefile
index 2126331129cf..0a76443be1aa 100644
--- a/drivers/iio/amplifiers/Makefile
+++ b/drivers/iio/amplifiers/Makefile
@@ -6,4 +6,5 @@
# When adding new entries keep the list in alphabetical order
obj-$(CONFIG_AD8366) += ad8366.o
obj-$(CONFIG_ADA4250) += ada4250.o
+obj-$(CONFIG_ADL8113) += adl8113.o
obj-$(CONFIG_HMC425) += hmc425a.o
diff --git a/drivers/iio/amplifiers/adl8113.c b/drivers/iio/amplifiers/adl8113.c
new file mode 100644
index 000000000000..118789aa2c19
--- /dev/null
+++ b/drivers/iio/amplifiers/adl8113.c
@@ -0,0 +1,277 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ADL8113 Low Noise Amplifier with integrated bypass switches
+ *
+ * Copyright 2025 Analog Devices Inc.
+ */
+
+#include <linux/array_size.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/iio/iio.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+
+enum adl8113_signal_path {
+ ADL8113_INTERNAL_AMP,
+ ADL8113_INTERNAL_BYPASS,
+ ADL8113_EXTERNAL_A,
+ ADL8113_EXTERNAL_B,
+};
+
+struct adl8113_gain_config {
+ enum adl8113_signal_path path;
+ int gain_db;
+ int va;
+ int vb;
+};
+
+struct adl8113_state {
+ struct gpio_desc *gpio_va;
+ struct gpio_desc *gpio_vb;
+ struct adl8113_gain_config *gain_configs;
+ int num_gain_configs;
+ enum adl8113_signal_path current_path;
+};
+
+static const char * const adl8113_supply_names[] = {
+ "vdd1",
+ "vdd2",
+ "vss2"
+};
+
+static int adl8113_set_path(struct adl8113_state *st,
+ enum adl8113_signal_path path)
+{
+ int va, vb;
+
+ /* Determine GPIO values based on signal path */
+ switch (path) {
+ case ADL8113_INTERNAL_AMP:
+ va = 0; vb = 0; /* Internal amplifier */
+ break;
+ case ADL8113_INTERNAL_BYPASS:
+ va = 1; vb = 1; /* Internal bypass */
+ break;
+ case ADL8113_EXTERNAL_A:
+ va = 0; vb = 1; /* External bypass A */
+ break;
+ case ADL8113_EXTERNAL_B:
+ va = 1; vb = 0; /* External bypass B */
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ gpiod_set_value(st->gpio_va, va);
+ gpiod_set_value(st->gpio_vb, vb);
+ st->current_path = path;
+ return 0;
+}
+
+static int adl8113_find_gain_config(struct adl8113_state *st, int gain_db)
+{
+ int i;
+
+ for (i = 0; i < st->num_gain_configs; i++) {
+ if (st->gain_configs[i].gain_db == gain_db)
+ return i;
+ }
+ return -EINVAL;
+}
+
+static const struct iio_chan_spec adl8113_channels[] = {
+ {
+ .type = IIO_VOLTAGE,
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_HARDWAREGAIN),
+ .indexed = 1,
+ .channel = 0,
+ },
+};
+
+static int adl8113_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct adl8113_state *st = iio_priv(indio_dev);
+ int i;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_HARDWAREGAIN:
+ /* Find current gain configuration */
+ for (i = 0; i < st->num_gain_configs; i++) {
+ if (st->gain_configs[i].path == st->current_path) {
+ *val = st->gain_configs[i].gain_db;
+ *val2 = 0;
+ return IIO_VAL_INT_PLUS_MICRO_DB;
+ }
+ }
+ return -EINVAL;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int adl8113_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct adl8113_state *st = iio_priv(indio_dev);
+ int config_idx;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_HARDWAREGAIN:
+ if (val2 != 0)
+ return -EINVAL;
+
+ config_idx = adl8113_find_gain_config(st, val);
+ if (config_idx < 0)
+ return -EINVAL;
+
+ return adl8113_set_path(st, st->gain_configs[config_idx].path);
+ default:
+ return -EINVAL;
+ }
+}
+
+static const struct iio_info adl8113_info = {
+ .read_raw = adl8113_read_raw,
+ .write_raw = adl8113_write_raw,
+};
+
+static int adl8113_init_gain_configs(struct device *dev, struct adl8113_state *st)
+{
+ int external_a_gain, external_b_gain;
+ int num_configs = 2; /* Always have internal amp and internal bypass */
+ int i = 0;
+
+ /* Check for optional external bypass amplifier gains */
+ if (!device_property_read_u32(dev, "adi,external-bypass-a-gain-db",
+ &external_a_gain))
+ num_configs++;
+
+ if (!device_property_read_u32(dev, "adi,external-bypass-b-gain-db",
+ &external_b_gain))
+ num_configs++;
+
+ st->gain_configs = devm_kcalloc(dev, num_configs,
+ sizeof(*st->gain_configs), GFP_KERNEL);
+ if (!st->gain_configs)
+ return -ENOMEM;
+
+ /* Always include internal amplifier (14dB) */
+ st->gain_configs[i].path = ADL8113_INTERNAL_AMP;
+ st->gain_configs[i].gain_db = 14;
+ i++;
+
+ /* Always include internal bypass (0dB) */
+ st->gain_configs[i].path = ADL8113_INTERNAL_BYPASS;
+ st->gain_configs[i].gain_db = 0;
+ i++;
+
+ /* Add external bypass A if configured */
+ if (!device_property_read_u32(dev, "adi,external-bypass-a-gain-db",
+ &external_a_gain)) {
+ st->gain_configs[i].path = ADL8113_EXTERNAL_A;
+ st->gain_configs[i].gain_db = external_a_gain;
+ i++;
+ }
+
+ /* Add external bypass B if configured */
+ if (!device_property_read_u32(dev, "adi,external-bypass-b-gain-db",
+ &external_b_gain)) {
+ st->gain_configs[i].path = ADL8113_EXTERNAL_B;
+ st->gain_configs[i].gain_db = external_b_gain;
+ i++;
+ }
+
+ st->num_gain_configs = num_configs;
+
+ /* Check for duplicate gain values */
+ for (i = 0; i < num_configs - 1; i++) {
+ for (int j = i + 1; j < num_configs; j++) {
+ if (st->gain_configs[i].gain_db == st->gain_configs[j].gain_db) {
+ dev_err(dev, "Duplicate gain values not allowed: %d dB\n",
+ st->gain_configs[i].gain_db);
+ return -EINVAL;
+ }
+ }
+ }
+
+ return 0;
+}
+
+static int adl8113_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct adl8113_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);
+
+ st->gpio_va = devm_gpiod_get(dev, "va", GPIOD_OUT_LOW);
+ if (IS_ERR(st->gpio_va))
+ return dev_err_probe(dev, PTR_ERR(st->gpio_va),
+ "failed to get VA GPIO\n");
+
+ st->gpio_vb = devm_gpiod_get(dev, "vb", GPIOD_OUT_LOW);
+ if (IS_ERR(st->gpio_vb))
+ return dev_err_probe(dev, PTR_ERR(st->gpio_vb),
+ "failed to get VB GPIO\n");
+
+ ret = devm_regulator_bulk_get_enable(dev,
+ ARRAY_SIZE(adl8113_supply_names),
+ adl8113_supply_names);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "failed to get and enable supplies\n");
+
+ /* Initialize gain configurations from devicetree */
+ ret = adl8113_init_gain_configs(dev, st);
+ if (ret)
+ return ret;
+
+ /* Initialize to internal amplifier path (14dB) */
+ ret = adl8113_set_path(st, ADL8113_INTERNAL_AMP);
+ if (ret)
+ return ret;
+
+ indio_dev->info = &adl8113_info;
+ indio_dev->name = "adl8113";
+ indio_dev->channels = adl8113_channels;
+ indio_dev->num_channels = ARRAY_SIZE(adl8113_channels);
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ return devm_iio_device_register(dev, indio_dev);
+}
+
+static const struct of_device_id adl8113_of_match[] = {
+ { .compatible = "adi,adl8113" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, adl8113_of_match);
+
+static struct platform_driver adl8113_driver = {
+ .driver = {
+ .name = "adl8113",
+ .of_match_table = adl8113_of_match,
+ },
+ .probe = adl8113_probe,
+};
+
+module_platform_driver(adl8113_driver);
+
+MODULE_AUTHOR("Antoniu Miclaus <antoniu.miclaus@...log.com>");
+MODULE_DESCRIPTION("Analog Devices ADL8113 Low Noise Amplifier");
+MODULE_LICENSE("GPL");
--
2.43.0
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