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#include <linux/gpio/driver.h>
11
12static int ucb1400_gpio_dir_in(struct gpio_chip *gc, unsigned off)
13{
14	struct ucb1400_gpio *gpio;
15	gpio = gpiochip_get_data(gc);
16	ucb1400_gpio_set_direction(gpio->ac97, off, 0);
17	return 0;
18}
19
20static int ucb1400_gpio_dir_out(struct gpio_chip *gc, unsigned off, int val)
21{
22	struct ucb1400_gpio *gpio;
23	gpio = gpiochip_get_data(gc);
24	ucb1400_gpio_set_direction(gpio->ac97, off, 1);
25	ucb1400_gpio_set_value(gpio->ac97, off, val);
26	return 0;
27}
28
29static int ucb1400_gpio_get(struct gpio_chip *gc, unsigned off)
30{
31	struct ucb1400_gpio *gpio;
32
33	gpio = gpiochip_get_data(gc);
34	return !!ucb1400_gpio_get_value(gpio->ac97, off);
35}
36
37static void ucb1400_gpio_set(struct gpio_chip *gc, unsigned off, int val)
38{
39	struct ucb1400_gpio *gpio;
40	gpio = gpiochip_get_data(gc);
41	ucb1400_gpio_set_value(gpio->ac97, off, val);
42}
43
44static int ucb1400_gpio_probe(struct platform_device *dev)
45{
46	struct ucb1400_gpio *ucb = dev_get_platdata(&dev->dev);
47	int err = 0;
48
49	if (!(ucb && ucb->gpio_offset)) {
50		err = -EINVAL;
51		goto err;
52	}
53
54	platform_set_drvdata(dev, ucb);
55
56	ucb->gc.label = "ucb1400_gpio";
57	ucb->gc.base = ucb->gpio_offset;
58	ucb->gc.ngpio = 10;
59	ucb->gc.owner = THIS_MODULE;
60
61	ucb->gc.direction_input = ucb1400_gpio_dir_in;
62	ucb->gc.direction_output = ucb1400_gpio_dir_out;
63	ucb->gc.get = ucb1400_gpio_get;
64	ucb->gc.set = ucb1400_gpio_set;
65	ucb->gc.can_sleep = true;
66
67	err = devm_gpiochip_add_data(&dev->dev, &ucb->gc, ucb);
68
69err:
70	return err;
71
72}
73
74static struct platform_driver ucb1400_gpio_driver = {
75	.probe	= ucb1400_gpio_probe,
76	.driver	= {
77		.name	= "ucb1400_gpio"
78	},
79};
80
81module_platform_driver(ucb1400_gpio_driver);
82
83MODULE_DESCRIPTION("Philips UCB1400 GPIO driver");
84MODULE_LICENSE("GPL");
85MODULE_ALIAS("platform:ucb1400_gpio");