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
clps711x_gpio_probe(struct platform_device * pdev)13 static 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, "gpio");
24 if ((id < 0) || (id > 4))
25 return -ENODEV;
26
27 gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
28 if (!gc)
29 return -ENOMEM;
30
31 dat = devm_platform_ioremap_resource(pdev, 0);
32 if (IS_ERR(dat))
33 return PTR_ERR(dat);
34
35 dir = devm_platform_ioremap_resource(pdev, 1);
36 if (IS_ERR(dir))
37 return PTR_ERR(dir);
38
39 switch (id) {
40 case 3:
41 /* PORTD is inverted logic for direction register */
42 err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
43 NULL, dir, 0);
44 break;
45 default:
46 err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
47 dir, NULL, 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, gc);
66
67 return devm_gpiochip_add_data(&pdev->dev, gc, NULL);
68 }
69
70 static const struct of_device_id __maybe_unused clps711x_gpio_ids[] = {
71 { .compatible = "cirrus,ep7209-gpio" },
72 { }
73 };
74 MODULE_DEVICE_TABLE(of, clps711x_gpio_ids);
75
76 static struct platform_driver clps711x_gpio_driver = {
77 .driver = {
78 .name = "clps711x-gpio",
79 .of_match_table = of_match_ptr(clps711x_gpio_ids),
80 },
81 .probe = clps711x_gpio_probe,
82 };
83 module_platform_driver(clps711x_gpio_driver);
84
85 MODULE_LICENSE("GPL");
86 MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
87 MODULE_DESCRIPTION("CLPS711X GPIO driver");
88 MODULE_ALIAS("platform:clps711x-gpio");
89