1/*
  2 * Philips UCB1400 GPIO driver
  3 *
  4 * Author: Marek Vasut <marek.vasut@gmail.com>
  5 *
  6 * This program is free software; you can redistribute it and/or modify
  7 * it under the terms of the GNU General Public License version 2 as
  8 * published by the Free Software Foundation.
  9 *
 10 */
 11
 12#include <linux/module.h>
 13#include <linux/ucb1400.h>
 14
 15static int ucb1400_gpio_dir_in(struct gpio_chip *gc, unsigned off)
 16{
 17	struct ucb1400_gpio *gpio;
 18	gpio = gpiochip_get_data(gc);
 19	ucb1400_gpio_set_direction(gpio->ac97, off, 0);
 20	return 0;
 21}
 22
 23static int ucb1400_gpio_dir_out(struct gpio_chip *gc, unsigned off, int val)
 24{
 25	struct ucb1400_gpio *gpio;
 26	gpio = gpiochip_get_data(gc);
 27	ucb1400_gpio_set_direction(gpio->ac97, off, 1);
 28	ucb1400_gpio_set_value(gpio->ac97, off, val);
 29	return 0;
 30}
 31
 32static int ucb1400_gpio_get(struct gpio_chip *gc, unsigned off)
 33{
 34	struct ucb1400_gpio *gpio;
 35
 36	gpio = gpiochip_get_data(gc);
 37	return !!ucb1400_gpio_get_value(gpio->ac97, off);
 38}
 39
 40static void ucb1400_gpio_set(struct gpio_chip *gc, unsigned off, int val)
 41{
 42	struct ucb1400_gpio *gpio;
 43	gpio = gpiochip_get_data(gc);
 44	ucb1400_gpio_set_value(gpio->ac97, off, val);
 45}
 46
 47static int ucb1400_gpio_probe(struct platform_device *dev)
 48{
 49	struct ucb1400_gpio *ucb = dev_get_platdata(&dev->dev);
 50	int err = 0;
 51
 52	if (!(ucb && ucb->gpio_offset)) {
 53		err = -EINVAL;
 54		goto err;
 55	}
 56
 57	platform_set_drvdata(dev, ucb);
 58
 59	ucb->gc.label = "ucb1400_gpio";
 60	ucb->gc.base = ucb->gpio_offset;
 61	ucb->gc.ngpio = 10;
 62	ucb->gc.owner = THIS_MODULE;
 63
 64	ucb->gc.direction_input = ucb1400_gpio_dir_in;
 65	ucb->gc.direction_output = ucb1400_gpio_dir_out;
 66	ucb->gc.get = ucb1400_gpio_get;
 67	ucb->gc.set = ucb1400_gpio_set;
 68	ucb->gc.can_sleep = true;
 69
 70	err = devm_gpiochip_add_data(&dev->dev, &ucb->gc, ucb);
 71	if (err)
 72		goto err;
 73
 74	if (ucb->gpio_setup)
 75		err = ucb->gpio_setup(&dev->dev, ucb->gc.ngpio);
 76
 77err:
 78	return err;
 79
 80}
 81
 82static int ucb1400_gpio_remove(struct platform_device *dev)
 83{
 84	int err = 0;
 85	struct ucb1400_gpio *ucb = platform_get_drvdata(dev);
 86
 87	if (ucb && ucb->gpio_teardown) {
 88		err = ucb->gpio_teardown(&dev->dev, ucb->gc.ngpio);
 89		if (err)
 90			return err;
 91	}
 92
 93	return err;
 94}
 95
 96static struct platform_driver ucb1400_gpio_driver = {
 97	.probe	= ucb1400_gpio_probe,
 98	.remove	= ucb1400_gpio_remove,
 99	.driver	= {
100		.name	= "ucb1400_gpio"
101	},
102};
103
104module_platform_driver(ucb1400_gpio_driver);
105
106MODULE_DESCRIPTION("Philips UCB1400 GPIO driver");
107MODULE_LICENSE("GPL");
108MODULE_ALIAS("platform:ucb1400_gpio");