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");
105