gpio: pca9570: add GPO driver for PCA9570 (16d44b60) · Commits · 戴 / test

drivers/gpio/Kconfig

+8 −0

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		@@ -962,6 +962,14 @@ config GPIO_PCA953X_IRQ
		Say yes here to enable the pca953x to be used as an interrupt
		controller. It requires the driver to be built in the kernel.

		config GPIO_PCA9570
		tristate "PCA9570 4-Bit I2C GPO expander"
		help
		Say yes here to enable the GPO driver for the NXP PCA9570 chip.

		To compile this driver as a module, choose M here: the module will
		be called gpio-pca9570.

		config GPIO_PCF857X
		tristate "PCF857x, PCA{85,96}7x, and MAX732[89] I2C GPIO expanders"
		select GPIOLIB_IRQCHIP

drivers/gpio/Makefile

+1 −0

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		@@ -111,6 +111,7 @@ obj-$(CONFIG_GPIO_OCTEON) += gpio-octeon.o
		obj-$(CONFIG_GPIO_OMAP) += gpio-omap.o
		obj-$(CONFIG_GPIO_PALMAS) += gpio-palmas.o
		obj-$(CONFIG_GPIO_PCA953X) += gpio-pca953x.o
		obj-$(CONFIG_GPIO_PCA9570) += gpio-pca9570.o
		obj-$(CONFIG_GPIO_PCF857X) += gpio-pcf857x.o
		obj-$(CONFIG_GPIO_PCH) += gpio-pch.o
		obj-$(CONFIG_GPIO_PCIE_IDIO_24) += gpio-pcie-idio-24.o

drivers/gpio/gpio-pca9570.c

0 → 100644

+146 −0

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		// SPDX-License-Identifier: GPL-2.0-only
		/*
		* Driver for PCA9570 I2C GPO expander
		*
		* Copyright (C) 2020 Sungbo Eo <mans0n@gorani.run>
		*
		* Based on gpio-tpic2810.c
		* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
		* Andrew F. Davis <afd@ti.com>
		*/

		#include <linux/gpio/driver.h>
		#include <linux/i2c.h>
		#include <linux/module.h>
		#include <linux/mutex.h>
		#include <linux/property.h>

		/**
		* struct pca9570 - GPIO driver data
		* @chip: GPIO controller chip
		* @lock: Protects write sequences
		* @out: Buffer for device register
		*/
		struct pca9570 {
		struct gpio_chip chip;
		struct mutex lock;
		u8 out;
		};

		static int pca9570_read(struct pca9570 gpio, u8 value)
		{
		struct i2c_client *client = to_i2c_client(gpio->chip.parent);
		int ret;

		ret = i2c_smbus_read_byte(client);
		if (ret < 0)
		return ret;

		*value = ret;
		return 0;
		}

		static int pca9570_write(struct pca9570 *gpio, u8 value)
		{
		struct i2c_client *client = to_i2c_client(gpio->chip.parent);

		return i2c_smbus_write_byte(client, value);
		}

		static int pca9570_get_direction(struct gpio_chip *chip,
		unsigned offset)
		{
		/* This device always output */
		return GPIO_LINE_DIRECTION_OUT;
		}

		static int pca9570_get(struct gpio_chip *chip, unsigned offset)
		{
		struct pca9570 *gpio = gpiochip_get_data(chip);
		u8 buffer;
		int ret;

		ret = pca9570_read(gpio, &buffer);
		if (ret)
		return ret;

		return !!(buffer & BIT(offset));
		}

		static void pca9570_set(struct gpio_chip *chip, unsigned offset, int value)
		{
		struct pca9570 *gpio = gpiochip_get_data(chip);
		u8 buffer;
		int ret;

		mutex_lock(&gpio->lock);

		buffer = gpio->out;
		if (value)
		buffer \|= BIT(offset);
		else
		buffer &= ~BIT(offset);

		ret = pca9570_write(gpio, buffer);
		if (ret)
		goto out;

		gpio->out = buffer;

		out:
		mutex_unlock(&gpio->lock);
		}

		static int pca9570_probe(struct i2c_client *client)
		{
		struct pca9570 *gpio;

		gpio = devm_kzalloc(&client->dev, sizeof(*gpio), GFP_KERNEL);
		if (!gpio)
		return -ENOMEM;

		gpio->chip.label = client->name;
		gpio->chip.parent = &client->dev;
		gpio->chip.owner = THIS_MODULE;
		gpio->chip.get_direction = pca9570_get_direction;
		gpio->chip.get = pca9570_get;
		gpio->chip.set = pca9570_set;
		gpio->chip.base = -1;
		gpio->chip.ngpio = (uintptr_t)device_get_match_data(&client->dev);
		gpio->chip.can_sleep = true;

		mutex_init(&gpio->lock);

		/* Read the current output level */
		pca9570_read(gpio, &gpio->out);

		i2c_set_clientdata(client, gpio);

		return devm_gpiochip_add_data(&client->dev, &gpio->chip, gpio);
		}

		static const struct i2c_device_id pca9570_id_table[] = {
		{ "pca9570", 4 },
		{ /* sentinel */ }
		};
		MODULE_DEVICE_TABLE(i2c, pca9570_id_table);

		static const struct of_device_id pca9570_of_match_table[] = {
		{ .compatible = "nxp,pca9570", .data = (void *)4 },
		{ /* sentinel */ }
		};
		MODULE_DEVICE_TABLE(of, pca9570_of_match_table);

		static struct i2c_driver pca9570_driver = {
		.driver = {
		.name = "pca9570",
		.of_match_table = pca9570_of_match_table,
		},
		.probe_new = pca9570_probe,
		.id_table = pca9570_id_table,
		};
		module_i2c_driver(pca9570_driver);

		MODULE_AUTHOR("Sungbo Eo <mans0n@gorani.run>");
		MODULE_DESCRIPTION("GPIO expander driver for PCA9570");
		MODULE_LICENSE("GPL v2");

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