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Thu, 9 Jul 2026 04:50:45 -0400 From: Janani Sunil Date: Thu, 9 Jul 2026 10:50:16 +0200 Subject: [PATCH 5/6] gpio: ad7768: Add AD7768 GPIO auxiliary driver Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-ID: <20260709-ad7768-driver-v1-5-44e1194fd96a@analog.com> References: <20260709-ad7768-driver-v1-0-44e1194fd96a@analog.com> In-Reply-To: <20260709-ad7768-driver-v1-0-44e1194fd96a@analog.com> To: =?utf-8?q?Nuno_S=C3=A1?= , Michael Hennerich , Jonathan Cameron , "David Lechner" , Andy Shevchenko , "Rob Herring" , Krzysztof Kozlowski , "Conor Dooley" , Olivier Moysan , Philipp Zabel , Linus Walleij , Bartosz Golaszewski , Jonathan Corbet , Shuah Khan CC: , , , , , , , Janani Sunil X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1783587021; l=7959; i=janani.sunil@analog.com; s=20260507; h=from:subject:message-id; bh=RJpV7TdKEVn/X4ZDVZi4+0WvVsUR+xhJUsor4mZbVIY=; 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Add an auxiliary bus driver to expose these pins as a GPIO chip, registered by the parent IIO driver. The driver uses the parent's regmap for register access and delegates runtime power management to the parent device. Signed-off-by: Janani Sunil --- MAINTAINERS | 1 + drivers/gpio/Kconfig | 10 +++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-ad7768.c | 208 +++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 220 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index dc94e7803a7c..3de7ebcc4ee7 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1639,6 +1639,7 @@ L: linux-iio@vger.kernel.org S: Supported W: https://ez.analog.com/linux-software-drivers F: Documentation/devicetree/bindings/iio/adc/adi,ad7768.yaml +F: drivers/gpio/gpio-ad7768.c F: drivers/iio/adc/ad7768.c ANALOG DEVICES INC AD7780 DRIVER diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 28cf6d2e83c2..12ebbdb16982 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -1796,6 +1796,16 @@ endmenu menu "Auxiliary Bus GPIO drivers" depends on AUXILIARY_BUS +config GPIO_AD7768 + tristate "Analog Devices AD7768 GPIO support" + depends on AD7768 && GPIOLIB + help + Say yes here to expose the AD7768 utility pins as GPIOs when the + device tree node is marked as a GPIO controller. + + To compile this driver as a module, choose M here: the module will be + called gpio-ad7768. + config GPIO_LTC4283 tristate "Analog Devices LTC4283 GPIO support" depends on SENSORS_LTC4283 diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 4d0e900402fc..d2921963efc7 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -27,6 +27,7 @@ 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-$(CONFIG_GPIO_AD7768) += gpio-ad7768.o obj-$(CONFIG_GPIO_ADNP) += gpio-adnp.o obj-$(CONFIG_GPIO_ADP5520) += gpio-adp5520.o obj-$(CONFIG_GPIO_ADP5585) += gpio-adp5585.o diff --git a/drivers/gpio/gpio-ad7768.c b/drivers/gpio/gpio-ad7768.c new file mode 100644 index 000000000000..c2f01b1abd7c --- /dev/null +++ b/drivers/gpio/gpio-ad7768.c @@ -0,0 +1,208 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Analog Devices AD7768 GPIO auxiliary driver + * + * Copyright 2026 Analog Devices Inc. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define AD7768_REG_GPIO_CONTROL 0x0E +#define AD7768_REG_GPIO_WRITE 0x0F +#define AD7768_REG_GPIO_READ 0x10 + +#define AD7768_GPIO_UGPIO_ENABLE BIT(7) +#define AD7768_GPIO_INPUT 0x00 +#define AD7768_GPIO_OUTPUT(x) BIT(x) + +#define AD7768_NUM_GPIOS 5 + +struct ad7768_gpio_state { + struct device *parent; + struct regmap *regmap; + struct mutex lock; /* protects regmap accesses */ + struct gpio_chip gc; +}; + +static int ad7768_gpio_direction_input(struct gpio_chip *chip, + unsigned int offset) +{ + struct ad7768_gpio_state *st = gpiochip_get_data(chip); + + PM_RUNTIME_ACQUIRE_IF_ENABLED_AUTOSUSPEND(st->parent, pm); + int ret = PM_RUNTIME_ACQUIRE_ERR(&pm); + + if (ret) + return ret; + + return regmap_update_bits(st->regmap, AD7768_REG_GPIO_CONTROL, + BIT(offset), AD7768_GPIO_INPUT); +} + +static int ad7768_gpio_get_direction(struct gpio_chip *chip, + unsigned int offset) +{ + struct ad7768_gpio_state *st = gpiochip_get_data(chip); + unsigned int val; + int ret; + + PM_RUNTIME_ACQUIRE_IF_ENABLED_AUTOSUSPEND(st->parent, pm); + ret = PM_RUNTIME_ACQUIRE_ERR(&pm); + if (ret) + return ret; + + ret = regmap_read(st->regmap, AD7768_REG_GPIO_CONTROL, &val); + if (ret) + return ret; + + return !!(val & BIT(offset)) ? GPIO_LINE_DIRECTION_OUT : + GPIO_LINE_DIRECTION_IN; +} + +static int ad7768_gpio_direction_output(struct gpio_chip *chip, + unsigned int offset, int value) +{ + struct ad7768_gpio_state *st = gpiochip_get_data(chip); + int ret; + + PM_RUNTIME_ACQUIRE_IF_ENABLED_AUTOSUSPEND(st->parent, pm); + ret = PM_RUNTIME_ACQUIRE_ERR(&pm); + if (ret) + return ret; + + guard(mutex)(&st->lock); + + ret = regmap_update_bits(st->regmap, AD7768_REG_GPIO_CONTROL, + BIT(offset), AD7768_GPIO_OUTPUT(offset)); + if (ret) + return ret; + + return regmap_update_bits(st->regmap, AD7768_REG_GPIO_WRITE, + BIT(offset), value << offset); +} + +static int ad7768_gpio_get(struct gpio_chip *chip, unsigned int offset) +{ + struct ad7768_gpio_state *st = gpiochip_get_data(chip); + unsigned int val; + int ret; + + PM_RUNTIME_ACQUIRE_IF_ENABLED_AUTOSUSPEND(st->parent, pm); + ret = PM_RUNTIME_ACQUIRE_ERR(&pm); + if (ret) + return ret; + + guard(mutex)(&st->lock); + + ret = regmap_read(st->regmap, AD7768_REG_GPIO_CONTROL, &val); + if (ret) + return ret; + + if (val & BIT(offset)) + ret = regmap_read(st->regmap, AD7768_REG_GPIO_WRITE, &val); + else + ret = regmap_read(st->regmap, AD7768_REG_GPIO_READ, &val); + if (ret) + return ret; + + return !!(val & BIT(offset)); +} + +static int ad7768_gpio_set(struct gpio_chip *chip, unsigned int offset, + int value) +{ + struct ad7768_gpio_state *st = gpiochip_get_data(chip); + unsigned int val; + int ret; + + PM_RUNTIME_ACQUIRE_IF_ENABLED_AUTOSUSPEND(st->parent, pm); + ret = PM_RUNTIME_ACQUIRE_ERR(&pm); + if (ret) + return ret; + + guard(mutex)(&st->lock); + + ret = regmap_read(st->regmap, AD7768_REG_GPIO_CONTROL, &val); + if (ret) + return ret; + + if (!(val & BIT(offset))) + return 0; + + return regmap_update_bits(st->regmap, AD7768_REG_GPIO_WRITE, + BIT(offset), value << offset); +} + +static int ad7768_gpio_probe(struct auxiliary_device *adev, + const struct auxiliary_device_id *id) +{ + struct device *dev = &adev->dev; + const char *label = dev_get_platdata(dev); + struct ad7768_gpio_state *st; + struct gpio_chip *gc; + int ret; + + st = devm_kzalloc(dev, sizeof(*st), GFP_KERNEL); + if (!st) + return -ENOMEM; + + st->parent = dev->parent; + st->regmap = dev_get_regmap(dev->parent, NULL); + + ret = devm_mutex_init(dev, &st->lock); + if (ret) + return ret; + + ret = pm_runtime_resume_and_get(st->parent); + if (ret < 0) + return ret; + + ret = regmap_update_bits(st->regmap, AD7768_REG_GPIO_CONTROL, + AD7768_GPIO_UGPIO_ENABLE, + AD7768_GPIO_UGPIO_ENABLE); + + pm_runtime_mark_last_busy(st->parent); + pm_runtime_put_autosuspend(st->parent); + + if (ret < 0) + return ret; + + gc = &st->gc; + gc->label = label; + gc->base = -1; + gc->ngpio = AD7768_NUM_GPIOS; + gc->parent = dev; + gc->owner = THIS_MODULE; + gc->can_sleep = true; + gc->get_direction = ad7768_gpio_get_direction; + gc->direction_input = ad7768_gpio_direction_input; + gc->direction_output = ad7768_gpio_direction_output; + gc->get = ad7768_gpio_get; + gc->set = ad7768_gpio_set; + + return devm_gpiochip_add_data(dev, &st->gc, st); +} + +static const struct auxiliary_device_id ad7768_gpio_ids[] = { + { .name = "ad7768.gpio" }, + { } +}; +MODULE_DEVICE_TABLE(auxiliary, ad7768_gpio_ids); + +static struct auxiliary_driver ad7768_gpio_driver = { + .probe = ad7768_gpio_probe, + .id_table = ad7768_gpio_ids, +}; +module_auxiliary_driver(ad7768_gpio_driver); + +MODULE_AUTHOR("Janani Sunil "); +MODULE_DESCRIPTION("Analog Devices AD7768 GPIO auxiliary driver"); +MODULE_LICENSE("GPL"); -- 2.43.0