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Message-ID: <20240121103505.26475-3-kimseer.paller@analog.com>
Date: Sun, 21 Jan 2024 18:35:05 +0800
From: Kim Seer Paller <kimseer.paller@...log.com>
To: <linux-gpio@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
CC: Linus Walleij <linus.walleij@...aro.org>,
Bartosz Golaszewski
<brgl@...ev.pl>, Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski
<krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
"Kim
Seer Paller" <kimseer.paller@...log.com>
Subject: [PATCH 2/2] gpio: gpio-adg1414: New driver
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@...log.com>
---
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@...log.com>
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@...e.com>
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@...log.com>");
+MODULE_DESCRIPTION("ADG1414 SPST Switch Driver");
+MODULE_LICENSE("GPL");
--
2.34.1
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