gpio: Add driver for TI TPIC2810 (b866526d) · Commits · 戴 / test

drivers/gpio/Kconfig

+8 −0

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		@@ -739,6 +739,14 @@ config GPIO_SX150X
		8 bits: sx1508q
		16 bits: sx1509q

		config GPIO_TPIC2810
		tristate "TPIC2810 8-Bit I2C GPO expander"
		help
		Say yes here to enable the GPO driver for the TI TPIC2810 chip.

		To compile this driver as a module, choose M here: the module will
		be called gpio-tpic2810.

		endmenu

		menu "MFD GPIO expanders"

drivers/gpio/Makefile

+1 −0

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		@@ -97,6 +97,7 @@ obj-$(CONFIG_GPIO_TC3589X) += gpio-tc3589x.o
		obj-$(CONFIG_ARCH_TEGRA) += gpio-tegra.o
		obj-$(CONFIG_GPIO_TIMBERDALE) += gpio-timberdale.o
		obj-$(CONFIG_GPIO_PALMAS) += gpio-palmas.o
		obj-$(CONFIG_GPIO_TPIC2810) += gpio-tpic2810.o
		obj-$(CONFIG_GPIO_TPS6586X) += gpio-tps6586x.o
		obj-$(CONFIG_GPIO_TPS65910) += gpio-tps65910.o
		obj-$(CONFIG_GPIO_TPS65912) += gpio-tps65912.o

drivers/gpio/gpio-tpic2810.c

0 → 100644

+167 −0

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		/*
		* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
		* Andrew F. Davis <afd@ti.com>
		*
		* This program is free software; you can redistribute it and/or
		* modify it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*
		* This program is distributed "as is" WITHOUT ANY WARRANTY of any
		* kind, whether expressed or implied; without even the implied warranty
		* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License version 2 for more details.
		*/

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

		#define TPIC2810_WS_COMMAND 0x44

		/**
		* struct tpic2810 - GPIO driver data
		* @chip: GPIO controller chip
		* @client: I2C device pointer
		* @buffer: Buffer for device register
		* @lock: Protects write sequences
		*/
		struct tpic2810 {
		struct gpio_chip chip;
		struct i2c_client *client;
		u8 buffer;
		struct mutex lock;
		};

		static int tpic2810_get_direction(struct gpio_chip *chip,
		unsigned offset)
		{
		/* This device always output */
		return 0;
		}

		static int tpic2810_direction_input(struct gpio_chip *chip,
		unsigned offset)
		{
		/* This device is output only */
		return -EINVAL;
		}

		static int tpic2810_direction_output(struct gpio_chip *chip,
		unsigned offset, int value)
		{
		/* This device always output */
		return 0;
		}

		static void tpic2810_set(struct gpio_chip *chip, unsigned offset, int value)
		{
		struct tpic2810 *gpio = gpiochip_get_data(chip);

		mutex_lock(&gpio->lock);

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

		i2c_smbus_write_byte_data(gpio->client, TPIC2810_WS_COMMAND,
		gpio->buffer);

		mutex_unlock(&gpio->lock);
		}

		static void tpic2810_set_multiple(struct gpio_chip chip, unsigned long mask,
		unsigned long *bits)
		{
		struct tpic2810 *gpio = gpiochip_get_data(chip);

		mutex_lock(&gpio->lock);

		/* clear bits under mask */
		gpio->buffer &= ~(*mask);
		/* set bits under mask */
		gpio->buffer \|= ((mask) & (bits));

		i2c_smbus_write_byte_data(gpio->client, TPIC2810_WS_COMMAND,
		gpio->buffer);

		mutex_unlock(&gpio->lock);
		}

		static struct gpio_chip template_chip = {
		.label = "tpic2810",
		.owner = THIS_MODULE,
		.get_direction = tpic2810_get_direction,
		.direction_input = tpic2810_direction_input,
		.direction_output = tpic2810_direction_output,
		.set = tpic2810_set,
		.set_multiple = tpic2810_set_multiple,
		.base = -1,
		.ngpio = 8,
		.can_sleep = true,
		};

		static const struct of_device_id tpic2810_of_match_table[] = {
		{ .compatible = "ti,tpic2810" },
		{ /* sentinel */ }
		};
		MODULE_DEVICE_TABLE(of, tpic2810_of_match_table);

		static int tpic2810_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		struct tpic2810 *gpio;
		int ret;

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

		i2c_set_clientdata(client, gpio);

		gpio->chip = template_chip;
		gpio->chip.parent = &client->dev;

		gpio->client = client;

		mutex_init(&gpio->lock);

		ret = gpiochip_add_data(&gpio->chip, gpio);
		if (ret < 0) {
		dev_err(&client->dev, "Unable to register gpiochip\n");
		return ret;
		}

		return 0;
		}

		static int tpic2810_remove(struct i2c_client *client)
		{
		struct tpic2810 *gpio = i2c_get_clientdata(client);

		gpiochip_remove(&gpio->chip);

		return 0;
		}

		static const struct i2c_device_id tpic2810_id_table[] = {
		{ "tpic2810", },
		{ /* sentinel */ }
		};
		MODULE_DEVICE_TABLE(i2c, tpic2810_id_table);

		static struct i2c_driver tpic2810_driver = {
		.driver = {
		.name = "tpic2810",
		.of_match_table = tpic2810_of_match_table,
		},
		.probe = tpic2810_probe,
		.remove = tpic2810_remove,
		.id_table = tpic2810_id_table,
		};
		module_i2c_driver(tpic2810_driver);

		MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
		MODULE_DESCRIPTION("TPIC2810 8-Bit LED Driver GPIO Driver");
		MODULE_LICENSE("GPL v2");

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