The ADG1414 is a 9.5 Ω RON ±15 V/+12 V/±5 V iCMOS Serially-Controlled Octal SPST Switches Signed-off-by: Kim Seer Paller <kimseer.paller@xxxxxxxxxx> --- MAINTAINERS | 1 + drivers/gpio/Kconfig | 10 +++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-adg1414.c | 141 ++++++++++++++++++++++++++++++++++++ 4 files changed, 153 insertions(+) create mode 100644 drivers/gpio/gpio-adg1414.c diff --git a/MAINTAINERS b/MAINTAINERS index 526145e69..254ba7ea5 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -466,6 +466,7 @@ M: Kim Seer Paller <kimseer.paller@xxxxxxxxxx> S: Supported W: https://ez.analog.com/linux-software-drivers F: Documentation/devicetree/bindings/gpio/gpio-adg1414.yaml +F: drivers/gpio/gpio-adg1414.c ADM1025 HARDWARE MONITOR DRIVER M: Jean Delvare <jdelvare@xxxxxxxx> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 1301cec94..25d467d70 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -1728,6 +1728,16 @@ config GPIO_74X164 shift registers. This driver can be used to provide access to more GPIO outputs. +config GPIO_ADG1414 + tristate "ADG1414 SPST Switch Driver" + depends on SPI + help + Say yes here to build support for Analog Devices ADG1414 SPST + Switch Driver + + To compile this driver as a module, choose M here: the + module will be called gpio-adg1414. + config GPIO_MAX3191X tristate "Maxim MAX3191x industrial serializer" select CRC8 diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 9e40af196..9ab45d128 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -24,6 +24,7 @@ obj-$(CONFIG_GPIO_104_IDI_48) += gpio-104-idi-48.o obj-$(CONFIG_GPIO_104_IDIO_16) += gpio-104-idio-16.o obj-$(CONFIG_GPIO_74X164) += gpio-74x164.o obj-$(CONFIG_GPIO_74XX_MMIO) += gpio-74xx-mmio.o +obj-$(CONFIG_GPIO_ADG1414) += gpio-adg1414.o obj-$(CONFIG_GPIO_ADNP) += gpio-adnp.o obj-$(CONFIG_GPIO_ADP5520) += gpio-adp5520.o obj-$(CONFIG_GPIO_AGGREGATOR) += gpio-aggregator.o diff --git a/drivers/gpio/gpio-adg1414.c b/drivers/gpio/gpio-adg1414.c new file mode 100644 index 000000000..6c0830ee2 --- /dev/null +++ b/drivers/gpio/gpio-adg1414.c @@ -0,0 +1,141 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ADG1414 SPST Switch Driver + * + * Copyright 2024 Analog Devices Inc. + */ + +#include <linux/delay.h> +#include <linux/gpio/consumer.h> +#include <linux/gpio/driver.h> +#include <linux/spi/spi.h> +#include <linux/module.h> +#include <linux/property.h> + +#define ADG1414_MAX_DEVICES 4 + +struct adg1414_state { + struct spi_device *spi; + struct gpio_chip chip; + struct mutex lock; /* protect sensor state */ + u32 buf; + + __be32 tx __aligned(ARCH_DMA_MINALIGN); +}; + +static void adg1414_set(struct gpio_chip *chip, + unsigned int offset, + int value) +{ + struct adg1414_state *st = gpiochip_get_data(chip); + int ret; + + struct spi_transfer xfer = { + .tx_buf = &st->tx, + .len = st->chip.ngpio / 8, + }; + + mutex_lock(&st->lock); + + if (value) + st->buf |= BIT(offset); + else + st->buf &= ~BIT(offset); + + st->tx = cpu_to_be32(st->buf << (32 - st->chip.ngpio)); + + ret = spi_sync_transfer(st->spi, &xfer, 1); + if (ret) + goto out; + +out: + mutex_unlock(&st->lock); +} + +static int adg1414_get(struct gpio_chip *chip, + unsigned int offset) +{ + struct adg1414_state *st = gpiochip_get_data(chip); + int value; + + mutex_lock(&st->lock); + + value = st->buf & BIT(offset); + + mutex_unlock(&st->lock); + + return value; +} + +static int adg1414_get_direction(struct gpio_chip *chip, + unsigned int offset) +{ + return GPIO_LINE_DIRECTION_OUT; +} + +static int adg1414_probe(struct spi_device *spi) +{ + struct adg1414_state *st; + struct gpio_desc *reset; + struct device *dev = &spi->dev; + u32 num_devices; + int ret; + + st = devm_kzalloc(dev, sizeof(*st), GFP_KERNEL); + if (!st) + return -ENOMEM; + + st->spi = spi; + + /* Use reset pin to reset the device */ + reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(reset)) + return dev_err_probe(dev, PTR_ERR(reset), + "Failed to get reset gpio"); + + if (reset) { + fsleep(1); + gpiod_set_value_cansleep(reset, 0); + } + + num_devices = 1; + ret = device_property_read_u32(dev, "#daisy-chained-devices", + &num_devices); + if (!ret) { + if (!num_devices || num_devices > ADG1414_MAX_DEVICES) + return dev_err_probe(dev, ret, + "Failed to get daisy-chained-devices property\n"); + } + + st->chip.label = "adg1414"; + st->chip.parent = dev; + st->chip.get_direction = adg1414_get_direction; + st->chip.set = adg1414_set; + st->chip.get = adg1414_get; + st->chip.base = -1; + st->chip.ngpio = num_devices * 8; + st->chip.can_sleep = true; + + mutex_init(&st->lock); + + return devm_gpiochip_add_data(dev, &st->chip, st); +} + +static const struct of_device_id adg1414_of_match[] = { + { .compatible = "adi,adg1414" }, + { } +}; +MODULE_DEVICE_TABLE(of, adg1414_of_match); + +static struct spi_driver adg1414_driver = { + .driver = { + .name = "adg1414", + .of_match_table = adg1414_of_match, + }, + .probe = adg1414_probe, +}; +module_spi_driver(adg1414_driver); + +MODULE_AUTHOR("Kim Seer Paller <kimseer.paller@xxxxxxxxxx>"); +MODULE_DESCRIPTION("ADG1414 SPST Switch Driver"); +MODULE_LICENSE("GPL"); -- 2.34.1
