// SPDX-License-Identifier: GPL-2.0-only

  /*
   * Philips UCB1400 GPIO driver
   *
   * Author: Marek Vasut <marek.vasut@gmail.com>

   */
  
  #include <linux/module.h>
  #include <linux/ucb1400.h>

  static int ucb1400_gpio_dir_in(struct gpio_chip *gc, unsigned off)
  {
  	struct ucb1400_gpio *gpio;

  	gpio = gpiochip_get_data(gc);

  	ucb1400_gpio_set_direction(gpio->ac97, off, 0);
  	return 0;
  }
  
  static int ucb1400_gpio_dir_out(struct gpio_chip *gc, unsigned off, int val)
  {
  	struct ucb1400_gpio *gpio;

  	gpio = gpiochip_get_data(gc);

  	ucb1400_gpio_set_direction(gpio->ac97, off, 1);
  	ucb1400_gpio_set_value(gpio->ac97, off, val);
  	return 0;
  }
  
  static int ucb1400_gpio_get(struct gpio_chip *gc, unsigned off)
  {
  	struct ucb1400_gpio *gpio;

  
  	gpio = gpiochip_get_data(gc);

  	return !!ucb1400_gpio_get_value(gpio->ac97, off);

  }
  
  static void ucb1400_gpio_set(struct gpio_chip *gc, unsigned off, int val)
  {
  	struct ucb1400_gpio *gpio;

  	gpio = gpiochip_get_data(gc);

  	ucb1400_gpio_set_value(gpio->ac97, off, val);
  }
  
  static int ucb1400_gpio_probe(struct platform_device *dev)
  {

  	struct ucb1400_gpio *ucb = dev_get_platdata(&dev->dev);

  	int err = 0;

  	if (!(ucb && ucb->gpio_offset)) {

  		err = -EINVAL;
  		goto err;
  	}
  
  	platform_set_drvdata(dev, ucb);
  
  	ucb->gc.label = "ucb1400_gpio";

  	ucb->gc.base = ucb->gpio_offset;

  	ucb->gc.ngpio = 10;
  	ucb->gc.owner = THIS_MODULE;
  
  	ucb->gc.direction_input = ucb1400_gpio_dir_in;
  	ucb->gc.direction_output = ucb1400_gpio_dir_out;
  	ucb->gc.get = ucb1400_gpio_get;
  	ucb->gc.set = ucb1400_gpio_set;

  	ucb->gc.can_sleep = true;

  	err = devm_gpiochip_add_data(&dev->dev, &ucb->gc, ucb);

  	if (err)
  		goto err;

  	if (ucb->gpio_setup)

  		err = ucb->gpio_setup(&dev->dev, ucb->gc.ngpio);

  
  err:
  	return err;
  
  }
  
  static int ucb1400_gpio_remove(struct platform_device *dev)
  {
  	int err = 0;
  	struct ucb1400_gpio *ucb = platform_get_drvdata(dev);

  	if (ucb && ucb->gpio_teardown) {
  		err = ucb->gpio_teardown(&dev->dev, ucb->gc.ngpio);

  		if (err)
  			return err;
  	}

  	return err;
  }
  
  static struct platform_driver ucb1400_gpio_driver = {
  	.probe	= ucb1400_gpio_probe,
  	.remove	= ucb1400_gpio_remove,
  	.driver	= {
  		.name	= "ucb1400_gpio"
  	},
  };

  module_platform_driver(ucb1400_gpio_driver);

  
  MODULE_DESCRIPTION("Philips UCB1400 GPIO driver");
  MODULE_LICENSE("GPL");

  MODULE_ALIAS("platform:ucb1400_gpio");