xref: /openbmc/linux/drivers/gpio/gpio-clps711x.c (revision 4a075bd4)
1 /*
2  *  CLPS711X GPIO driver
3  *
4  *  Copyright (C) 2012,2013 Alexander Shiyan <shc_work@mail.ru>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  */
11 
12 #include <linux/err.h>
13 #include <linux/module.h>
14 #include <linux/gpio/driver.h>
15 #include <linux/platform_device.h>
16 
17 static int clps711x_gpio_probe(struct platform_device *pdev)
18 {
19 	struct device_node *np = pdev->dev.of_node;
20 	void __iomem *dat, *dir;
21 	struct gpio_chip *gc;
22 	int err, id;
23 
24 	if (!np)
25 		return -ENODEV;
26 
27 	id = of_alias_get_id(np, "gpio");
28 	if ((id < 0) || (id > 4))
29 		return -ENODEV;
30 
31 	gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
32 	if (!gc)
33 		return -ENOMEM;
34 
35 	dat = devm_platform_ioremap_resource(pdev, 0);
36 	if (IS_ERR(dat))
37 		return PTR_ERR(dat);
38 
39 	dir = devm_platform_ioremap_resource(pdev, 1);
40 	if (IS_ERR(dir))
41 		return PTR_ERR(dir);
42 
43 	switch (id) {
44 	case 3:
45 		/* PORTD is inverted logic for direction register */
46 		err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
47 				 NULL, dir, 0);
48 		break;
49 	default:
50 		err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
51 				 dir, NULL, 0);
52 		break;
53 	}
54 
55 	if (err)
56 		return err;
57 
58 	switch (id) {
59 	case 4:
60 		/* PORTE is 3 lines only */
61 		gc->ngpio = 3;
62 		break;
63 	default:
64 		break;
65 	}
66 
67 	gc->base = -1;
68 	gc->owner = THIS_MODULE;
69 	platform_set_drvdata(pdev, gc);
70 
71 	return devm_gpiochip_add_data(&pdev->dev, gc, NULL);
72 }
73 
74 static const struct of_device_id __maybe_unused clps711x_gpio_ids[] = {
75 	{ .compatible = "cirrus,ep7209-gpio" },
76 	{ }
77 };
78 MODULE_DEVICE_TABLE(of, clps711x_gpio_ids);
79 
80 static struct platform_driver clps711x_gpio_driver = {
81 	.driver	= {
82 		.name		= "clps711x-gpio",
83 		.of_match_table	= of_match_ptr(clps711x_gpio_ids),
84 	},
85 	.probe	= clps711x_gpio_probe,
86 };
87 module_platform_driver(clps711x_gpio_driver);
88 
89 MODULE_LICENSE("GPL");
90 MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
91 MODULE_DESCRIPTION("CLPS711X GPIO driver");
92 MODULE_ALIAS("platform:clps711x-gpio");
93