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

source code of linux/drivers/gpio/gpio-clps711x.c