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Fri, 12 Dec 2025 10:42:34 -0500 From: Antoniu Miclaus To: Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron , "David Lechner" , =?UTF-8?q?Nuno=20S=C3=A1?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Antoniu Miclaus , , , Subject: [PATCH v7 2/2] iio: amplifiers: adl8113: add driver support Date: Fri, 12 Dec 2025 17:38:26 +0200 Message-ID: <20251212153908.138422-3-antoniu.miclaus@analog.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251212153908.138422-1-antoniu.miclaus@analog.com> References: <20251212153908.138422-1-antoniu.miclaus@analog.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-GUID: cWL6Q_HHrSJDqB4_TyNEF3Suxi6OPV6r X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMjEyMDEyNCBTYWx0ZWRfXwrgYKiDsUKQ0 h/qgV52+8dz1+qnrcgAPp3QxgN62ZIIJ1qALzwpNOEEHieHg1qUTq1xsm63Vau4XLe99LhBS3xy tAMN8jg1VkukVWnY99g2YrWcodGU3NCkfR/Aj0mFq2znO1vRRmwkw/GFWsVmBDPemU0VPAH/IAg hDOM8X7fFSZ1jLGNM3YliNHuwsUK0AGnEH9yzXv59dH0wSPWCKrlFlreBxH47UMhogHelh0JXJD VL4V7p3qbaBYDkZqj3ck/NckeF4uVn+P//9UhZXH4uB7bKgs3hrC4sNQ9wiEHU/NeRJLyqHfRjS BClqcSugout6+1b6cn3jvWrFzFvmUari8B3X58h3juvdbC6gAmSqDhQfpbaGNIdx+SFYgFWDAAJ jQIjR/H5305YuMMlijohS748ALlYUg== X-Proofpoint-ORIG-GUID: cWL6Q_HHrSJDqB4_TyNEF3Suxi6OPV6r X-Authority-Analysis: v=2.4 cv=DeMaa/tW c=1 sm=1 tr=0 ts=693c37f3 cx=c_pps a=3WNzaoukacrqR9RwcOSAdA==:117 a=3WNzaoukacrqR9RwcOSAdA==:17 a=wP3pNCr1ah4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=gAnH3GRIAAAA:8 a=hAzo1ZWYCqDvnDRTSZMA:9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-12-12_04,2025-12-11_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 adultscore=0 lowpriorityscore=0 priorityscore=1501 bulkscore=0 clxscore=1015 spamscore=0 phishscore=0 malwarescore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2512120124 Content-Type: text/plain; charset="utf-8" Add support for adl8113 10MHz to 12GHz Low Noise Amplifier with 10MHz to 14GHz bypass switches. Signed-off-by: Antoniu Miclaus --- changes in v7: - Removed includes: limits.h, device.h, slab.h, sysfs.h - Added includes: bitmap.h, types.h, dev_printk.h, device/driver.h - Removed unused va and vb struct fields - Added trailing comma to supply names array - Changed num_gain_configs to unsigned int - Replaced bitmap operations with bitmap_write() - Enhanced comment showing bit mapping - Changed loop counters to unsigned int - Used compound literals for struct initialization - Fixed devm_kcalloc() line wrapping - Removed INT_MIN testing code - Removed duplicate gain validation - Fixed format specifier to %u for ndescs - Removed redundant blank line drivers/iio/amplifiers/Kconfig | 12 ++ drivers/iio/amplifiers/Makefile | 1 + drivers/iio/amplifiers/adl8113.c | 269 +++++++++++++++++++++++++++++++ 3 files changed, 282 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. =20 +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/Makef= ile 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-$(CONFIG_AD8366) +=3D ad8366.o obj-$(CONFIG_ADA4250) +=3D ada4250.o +obj-$(CONFIG_ADL8113) +=3D adl8113.o obj-$(CONFIG_HMC425) +=3D hmc425a.o diff --git a/drivers/iio/amplifiers/adl8113.c b/drivers/iio/amplifiers/adl8= 113.c new file mode 100644 index 000000000000..b8a431b6616b --- /dev/null +++ b/drivers/iio/amplifiers/adl8113.c @@ -0,0 +1,269 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ADL8113 Low Noise Amplifier with integrated bypass switches + * + * Copyright 2025 Analog Devices Inc. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +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; +}; + +struct adl8113_state { + struct gpio_descs *gpios; + struct adl8113_gain_config *gain_configs; + unsigned int num_gain_configs; + enum adl8113_signal_path current_path; +}; + +static const char * const adl8113_supply_names[] =3D { + "vdd1", + "vss2", + "vdd2", +}; + +static int adl8113_set_path(struct adl8113_state *st, + enum adl8113_signal_path path) +{ + DECLARE_BITMAP(values, 2); + int ret; + + /* + * Determine GPIO values based on signal path. + * Va: bit 0, Vb: bit 1. + */ + switch (path) { + case ADL8113_INTERNAL_AMP: + bitmap_write(values, 0x00, 0, 2); + break; + case ADL8113_INTERNAL_BYPASS: + bitmap_write(values, 0x03, 0, 2); + break; + case ADL8113_EXTERNAL_A: + bitmap_write(values, 0x02, 0, 2); + break; + case ADL8113_EXTERNAL_B: + bitmap_write(values, 0x01, 0, 2); + break; + default: + return -EINVAL; + } + + ret =3D gpiod_set_array_value_cansleep(st->gpios->ndescs, st->gpios->desc, + st->gpios->info, values); + if (ret) + return ret; + + st->current_path =3D path; + return 0; +} + +static int adl8113_find_gain_config(struct adl8113_state *st, int gain_db) +{ + unsigned int i; + + for (i =3D 0; i < st->num_gain_configs; i++) { + if (st->gain_configs[i].gain_db =3D=3D gain_db) + return i; + } + return -EINVAL; +} + +static const struct iio_chan_spec adl8113_channels[] =3D { + { + .type =3D IIO_VOLTAGE, + .info_mask_shared_by_type =3D BIT(IIO_CHAN_INFO_HARDWAREGAIN), + }, +}; + +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 =3D iio_priv(indio_dev); + unsigned int i; + + switch (mask) { + case IIO_CHAN_INFO_HARDWAREGAIN: + /* Find current gain configuration */ + for (i =3D 0; i < st->num_gain_configs; i++) { + if (st->gain_configs[i].path =3D=3D st->current_path) { + *val =3D st->gain_configs[i].gain_db; + *val2 =3D 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 =3D iio_priv(indio_dev); + int config_idx; + + switch (mask) { + case IIO_CHAN_INFO_HARDWAREGAIN: + if (val2 !=3D 0) + return -EINVAL; + + config_idx =3D adl8113_find_gain_config(st, val); + if (config_idx < 0) + return config_idx; + + return adl8113_set_path(st, st->gain_configs[config_idx].path); + default: + return -EINVAL; + } +} + +static const struct iio_info adl8113_info =3D { + .read_raw =3D adl8113_read_raw, + .write_raw =3D adl8113_write_raw, +}; + +static int adl8113_init_gain_configs(struct device *dev, struct adl8113_st= ate *st) +{ + int external_a_gain, external_b_gain; + unsigned int i; + + /* + * Allocate for all 4 possible paths: + * - Internal amp and bypass (always present) + * - External bypass A and B (optional if configured) + */ + st->gain_configs =3D devm_kcalloc(dev, 4, sizeof(*st->gain_configs), + GFP_KERNEL); + if (!st->gain_configs) + return -ENOMEM; + + /* Start filling the gain configurations with data */ + i =3D 0; + + /* Always include internal amplifier (14dB) */ + st->gain_configs[i++] =3D (struct adl8113_gain_config) { + .path =3D ADL8113_INTERNAL_AMP, + .gain_db =3D 14, + }; + + /* Always include internal bypass (-2dB insertion loss) */ + st->gain_configs[i++] =3D (struct adl8113_gain_config) { + .path =3D ADL8113_INTERNAL_BYPASS, + .gain_db =3D -2, + }; + + /* 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++] =3D (struct adl8113_gain_config) { + .path =3D ADL8113_EXTERNAL_A, + .gain_db =3D external_a_gain, + }; + } + + /* 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++] =3D (struct adl8113_gain_config) { + .path =3D ADL8113_EXTERNAL_B, + .gain_db =3D external_b_gain, + }; + } + + st->num_gain_configs =3D i; + + return 0; +} + +static int adl8113_probe(struct platform_device *pdev) +{ + struct device *dev =3D &pdev->dev; + struct adl8113_state *st; + struct iio_dev *indio_dev; + int ret; + + indio_dev =3D devm_iio_device_alloc(dev, sizeof(*st)); + if (!indio_dev) + return -ENOMEM; + + st =3D iio_priv(indio_dev); + + st->gpios =3D devm_gpiod_get_array(dev, "ctrl", GPIOD_OUT_LOW); + if (IS_ERR(st->gpios)) + return dev_err_probe(dev, PTR_ERR(st->gpios), + "failed to get control GPIOs\n"); + + if (st->gpios->ndescs !=3D 2) + return dev_err_probe(dev, -EINVAL, + "expected 2 control GPIOs, got %u\n", + st->gpios->ndescs); + + ret =3D 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 =3D adl8113_init_gain_configs(dev, st); + if (ret) + return ret; + + /* Initialize to internal amplifier path (14dB) */ + ret =3D adl8113_set_path(st, ADL8113_INTERNAL_AMP); + if (ret) + return ret; + + indio_dev->info =3D &adl8113_info; + indio_dev->name =3D "adl8113"; + indio_dev->channels =3D adl8113_channels; + indio_dev->num_channels =3D ARRAY_SIZE(adl8113_channels); + + return devm_iio_device_register(dev, indio_dev); +} + +static const struct of_device_id adl8113_of_match[] =3D { + { .compatible =3D "adi,adl8113" }, + { } +}; +MODULE_DEVICE_TABLE(of, adl8113_of_match); + +static struct platform_driver adl8113_driver =3D { + .driver =3D { + .name =3D "adl8113", + .of_match_table =3D adl8113_of_match, + }, + .probe =3D adl8113_probe, +}; +module_platform_driver(adl8113_driver); + +MODULE_AUTHOR("Antoniu Miclaus "); +MODULE_DESCRIPTION("Analog Devices ADL8113 Low Noise Amplifier"); +MODULE_LICENSE("GPL"); --=20 2.43.0