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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/drivers/gpio/gpio-bd9571mwv.c
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// SPDX-License-Identifier: GPL-2.0-only

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/*

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 * ROHM BD9571MWV-M and BD9574MWF-M GPIO driver

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 *

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 * Copyright (C) 2017 Marek Vasut <[email protected]>

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 *

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 * Based on the TPS65086 driver

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 *

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 * NOTE: Interrupts are not supported yet.

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 */

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#include <linux/gpio/driver.h>

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#include <linux/mfd/rohm-generic.h>

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#include <linux/module.h>

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#include <linux/platform_device.h>

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#include <linux/mfd/bd9571mwv.h>

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struct bd9571mwv_gpio {

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	struct regmap *regmap;

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	struct gpio_chip chip;

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};

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static int bd9571mwv_gpio_get_direction(struct gpio_chip *chip,

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				       unsigned int offset)

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{

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	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);

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	int ret, val;

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	ret = regmap_read(gpio->regmap, BD9571MWV_GPIO_DIR, &val);

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	if (ret < 0)

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		return ret;

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	if (val & BIT(offset))

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		return GPIO_LINE_DIRECTION_IN;

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	return GPIO_LINE_DIRECTION_OUT;

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}

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static int bd9571mwv_gpio_direction_input(struct gpio_chip *chip,

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					 unsigned int offset)

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{

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	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);

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	regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_DIR, BIT(offset), 0);

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	return 0;

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}

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static int bd9571mwv_gpio_direction_output(struct gpio_chip *chip,

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					  unsigned int offset, int value)

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{

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	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);

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	/* Set the initial value */

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	regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_OUT,

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			   BIT(offset), value ? BIT(offset) : 0);

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	regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_DIR,

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			   BIT(offset), BIT(offset));

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	return 0;

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}

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static int bd9571mwv_gpio_get(struct gpio_chip *chip, unsigned int offset)

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{

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	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);

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	int ret, val;

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	ret = regmap_read(gpio->regmap, BD9571MWV_GPIO_IN, &val);

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	if (ret < 0)

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		return ret;

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	return val & BIT(offset);

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}

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static int bd9571mwv_gpio_set(struct gpio_chip *chip, unsigned int offset,

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			      int value)

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{

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	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);

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	return regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_OUT,

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				  BIT(offset), value ? BIT(offset) : 0);

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}

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static const struct gpio_chip template_chip = {

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	.label			= "bd9571mwv-gpio",

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	.owner			= THIS_MODULE,

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	.get_direction		= bd9571mwv_gpio_get_direction,

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	.direction_input	= bd9571mwv_gpio_direction_input,

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	.direction_output	= bd9571mwv_gpio_direction_output,

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	.get			= bd9571mwv_gpio_get,

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	.set			= bd9571mwv_gpio_set,

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	.base			= -1,

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	.ngpio			= 2,

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	.can_sleep		= true,

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};

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static int bd9571mwv_gpio_probe(struct platform_device *pdev)

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{

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	struct bd9571mwv_gpio *gpio;

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	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);

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	if (!gpio)

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		return -ENOMEM;

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	gpio->regmap = dev_get_regmap(pdev->dev.parent, NULL);

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	gpio->chip = template_chip;

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	gpio->chip.parent = pdev->dev.parent;

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

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}

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static const struct platform_device_id bd9571mwv_gpio_id_table[] = {

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	{ "bd9571mwv-gpio", ROHM_CHIP_TYPE_BD9571 },

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	{ "bd9574mwf-gpio", ROHM_CHIP_TYPE_BD9574 },

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	{ /* sentinel */ }

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};

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MODULE_DEVICE_TABLE(platform, bd9571mwv_gpio_id_table);

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static struct platform_driver bd9571mwv_gpio_driver = {

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	.driver = {

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		.name = "bd9571mwv-gpio",

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	},

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	.probe = bd9571mwv_gpio_probe,

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	.id_table = bd9571mwv_gpio_id_table,

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};

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module_platform_driver(bd9571mwv_gpio_driver);

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MODULE_AUTHOR("Marek Vasut <[email protected]>");

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MODULE_DESCRIPTION("BD9571MWV GPIO driver");

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MODULE_LICENSE("GPL v2");

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