gpio-clps711x.c

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 *  CLPS711X GPIO driver
 4 *
 5 *  Copyright (C) 2012,2013 Alexander Shiyan <shc_work@mail.ru>
 6 */
 7
 8#include <linux/err.h>
 9#include <linux/module.h>
10#include <linux/gpio/driver.h>
11#include <linux/gpio/generic.h>
12#include <linux/platform_device.h>
13
14static int clps711x_gpio_probe(struct platform_device *pdev)
15{
16	struct gpio_generic_chip_config config = { };
17	struct device_node *np = pdev->dev.of_node;
18	struct gpio_generic_chip *gen_gc;
19	void __iomem *dat, *dir;
20	int err, id;
21
22	if (!np)
23		return -ENODEV;
24
25	id = of_alias_get_id(np, "gpio");
26	if ((id < 0) || (id > 4))
27		return -ENODEV;
28
29	gen_gc = devm_kzalloc(&pdev->dev, sizeof(*gen_gc), GFP_KERNEL);
30	if (!gen_gc)
31		return -ENOMEM;
32
33	dat = devm_platform_ioremap_resource(pdev, 0);
34	if (IS_ERR(dat))
35		return PTR_ERR(dat);
36
37	dir = devm_platform_ioremap_resource(pdev, 1);
38	if (IS_ERR(dir))
39		return PTR_ERR(dir);
40
41	config.dev = &pdev->dev;
42	config.sz = 1;
43	config.dat = dat;
44
45	switch (id) {
46	case 3:
47		/* PORTD is inverted logic for direction register */
48		config.dirin = dir;
49		break;
50	default:
51		config.dirout = dir;
52		break;
53	}
54
55	err = gpio_generic_chip_init(gen_gc, &config);
56	if (err)
57		return err;
58
59	switch (id) {
60	case 4:
61		/* PORTE is 3 lines only */
62		gen_gc->gc.ngpio = 3;
63		break;
64	default:
65		break;
66	}
67
68	gen_gc->gc.base = -1;
69	gen_gc->gc.owner = THIS_MODULE;
70
71	return devm_gpiochip_add_data(&pdev->dev, &gen_gc->gc, NULL);
72}
73
74static const struct of_device_id clps711x_gpio_ids[] = {
75	{ .compatible = "cirrus,ep7209-gpio" },
76	{ }
77};
78MODULE_DEVICE_TABLE(of, clps711x_gpio_ids);
79
80static struct platform_driver clps711x_gpio_driver = {
81	.driver	= {
82		.name		= "clps711x-gpio",
83		.of_match_table	= clps711x_gpio_ids,
84	},
85	.probe	= clps711x_gpio_probe,
86};
87module_platform_driver(clps711x_gpio_driver);
88
89MODULE_LICENSE("GPL");
90MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
91MODULE_DESCRIPTION("CLPS711X GPIO driver");
92MODULE_ALIAS("platform:clps711x-gpio");