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/*
* ROHM BD9571MWV-M GPIO driver
*
* Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.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.
*
* Based on the TPS65086 driver
*
* NOTE: Interrupts are not supported yet.
*/
#include <linux/gpio/driver.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mfd/bd9571mwv.h>
struct bd9571mwv_gpio {
struct gpio_chip chip;
struct bd9571mwv *bd;
};
static int bd9571mwv_gpio_get_direction(struct gpio_chip *chip,
unsigned int offset)
{
struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
int ret, val;
ret = regmap_read(gpio->bd->regmap, BD9571MWV_GPIO_DIR, &val);
if (ret < 0)
return ret;
if (val & BIT(offset))
return GPIO_LINE_DIRECTION_IN;
return GPIO_LINE_DIRECTION_OUT;
}
static int bd9571mwv_gpio_direction_input(struct gpio_chip *chip,
unsigned int offset)
{
struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_DIR,
BIT(offset), 0);
return 0;
}
static int bd9571mwv_gpio_direction_output(struct gpio_chip *chip,
unsigned int offset, int value)
{
struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
/* Set the initial value */
regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_OUT,
BIT(offset), value ? BIT(offset) : 0);
regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_DIR,
BIT(offset), BIT(offset));
return 0;
}
static int bd9571mwv_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
int ret, val;
ret = regmap_read(gpio->bd->regmap, BD9571MWV_GPIO_IN, &val);
if (ret < 0)
return ret;
return val & BIT(offset);
}
static void bd9571mwv_gpio_set(struct gpio_chip *chip, unsigned int offset,
int value)
{
struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_OUT,
BIT(offset), value ? BIT(offset) : 0);
}
static const struct gpio_chip template_chip = {
.label = "bd9571mwv-gpio",
.owner = THIS_MODULE,
.get_direction = bd9571mwv_gpio_get_direction,
.direction_input = bd9571mwv_gpio_direction_input,
.direction_output = bd9571mwv_gpio_direction_output,
.get = bd9571mwv_gpio_get,
.set = bd9571mwv_gpio_set,
.base = -1,
.ngpio = 2,
.can_sleep = true,
};
static int bd9571mwv_gpio_probe(struct platform_device *pdev)
{
struct bd9571mwv_gpio *gpio;
int ret;
gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
if (!gpio)
return -ENOMEM;
platform_set_drvdata(pdev, gpio);
gpio->bd = dev_get_drvdata(pdev->dev.parent);
gpio->chip = template_chip;
gpio->chip.parent = gpio->bd->dev;
ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
if (ret < 0) {
dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
return ret;
}
return 0;
}
static const struct platform_device_id bd9571mwv_gpio_id_table[] = {
{ "bd9571mwv-gpio", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, bd9571mwv_gpio_id_table);
static struct platform_driver bd9571mwv_gpio_driver = {
.driver = {
.name = "bd9571mwv-gpio",
},
.probe = bd9571mwv_gpio_probe,
.id_table = bd9571mwv_gpio_id_table,
};
module_platform_driver(bd9571mwv_gpio_driver);
MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
MODULE_DESCRIPTION("BD9571MWV GPIO driver");
MODULE_LICENSE("GPL v2");
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