1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Philips UCB1400 GPIO driver
  4 *
  5 * Author: Marek Vasut <marek.vasut@gmail.com>
  6 */
  7
  8#include <linux/module.h>
  9#include <linux/ucb1400.h>
 10
 11static int ucb1400_gpio_dir_in(struct gpio_chip *gc, unsigned off)
 12{
 13	struct ucb1400_gpio *gpio;
 14	gpio = gpiochip_get_data(gc);
 15	ucb1400_gpio_set_direction(gpio->ac97, off, 0);
 16	return 0;
 17}
 18
 19static int ucb1400_gpio_dir_out(struct gpio_chip *gc, unsigned off, int val)
 20{
 21	struct ucb1400_gpio *gpio;
 22	gpio = gpiochip_get_data(gc);
 23	ucb1400_gpio_set_direction(gpio->ac97, off, 1);
 24	ucb1400_gpio_set_value(gpio->ac97, off, val);
 25	return 0;
 26}
 27
 28static int ucb1400_gpio_get(struct gpio_chip *gc, unsigned off)
 29{
 30	struct ucb1400_gpio *gpio;
 31
 32	gpio = gpiochip_get_data(gc);
 33	return !!ucb1400_gpio_get_value(gpio->ac97, off);
 34}
 35
 36static void ucb1400_gpio_set(struct gpio_chip *gc, unsigned off, int val)
 37{
 38	struct ucb1400_gpio *gpio;
 39	gpio = gpiochip_get_data(gc);
 40	ucb1400_gpio_set_value(gpio->ac97, off, val);
 41}
 42
 43static int ucb1400_gpio_probe(struct platform_device *dev)
 44{
 45	struct ucb1400_gpio *ucb = dev_get_platdata(&dev->dev);
 46	int err = 0;
 47
 48	if (!(ucb && ucb->gpio_offset)) {
 49		err = -EINVAL;
 50		goto err;
 51	}
 52
 53	platform_set_drvdata(dev, ucb);
 54
 55	ucb->gc.label = "ucb1400_gpio";
 56	ucb->gc.base = ucb->gpio_offset;
 57	ucb->gc.ngpio = 10;
 58	ucb->gc.owner = THIS_MODULE;
 59
 60	ucb->gc.direction_input = ucb1400_gpio_dir_in;
 61	ucb->gc.direction_output = ucb1400_gpio_dir_out;
 62	ucb->gc.get = ucb1400_gpio_get;
 63	ucb->gc.set = ucb1400_gpio_set;
 64	ucb->gc.can_sleep = true;
 65
 66	err = devm_gpiochip_add_data(&dev->dev, &ucb->gc, ucb);
 67	if (err)
 68		goto err;
 69
 70	if (ucb->gpio_setup)
 71		err = ucb->gpio_setup(&dev->dev, ucb->gc.ngpio);
 72
 73err:
 74	return err;
 75
 76}
 77
 78static int ucb1400_gpio_remove(struct platform_device *dev)
 79{
 80	int err = 0;
 81	struct ucb1400_gpio *ucb = platform_get_drvdata(dev);
 82
 83	if (ucb && ucb->gpio_teardown) {
 84		err = ucb->gpio_teardown(&dev->dev, ucb->gc.ngpio);
 85		if (err)
 86			return err;
 87	}
 88
 89	return err;
 90}
 91
 92static struct platform_driver ucb1400_gpio_driver = {
 93	.probe	= ucb1400_gpio_probe,
 94	.remove	= ucb1400_gpio_remove,
 95	.driver	= {
 96		.name	= "ucb1400_gpio"
 97	},
 98};
 99
100module_platform_driver(ucb1400_gpio_driver);
101
102MODULE_DESCRIPTION("Philips UCB1400 GPIO driver");
103MODULE_LICENSE("GPL");
104MODULE_ALIAS("platform:ucb1400_gpio");