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
17static 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	struct resource *res;
23	int err, id = np ? of_alias_get_id(np, "gpio") : pdev->id;
24
25	if ((id < 0) || (id > 4))
26		return -ENODEV;
27
28	gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
29	if (!gc)
30		return -ENOMEM;
31
32	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
33	dat = devm_ioremap_resource(&pdev->dev, res);
34	if (IS_ERR(dat))
35		return PTR_ERR(dat);
36
37	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
38	dir = devm_ioremap_resource(&pdev->dev, res);
39	if (IS_ERR(dir))
40		return PTR_ERR(dir);
41
42	switch (id) {
43	case 3:
44		/* PORTD is inverted logic for direction register */
45		err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
46				 NULL, dir, 0);
47		break;
48	default:
49		err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
50				 dir, NULL, 0);
51		break;
52	}
53
54	if (err)
55		return err;
56
57	switch (id) {
58	case 4:
59		/* PORTE is 3 lines only */
60		gc->ngpio = 3;
61		break;
62	default:
63		break;
64	}
65
66	gc->base = id * 8;
67	gc->owner = THIS_MODULE;
68	platform_set_drvdata(pdev, gc);
69
70	return devm_gpiochip_add_data(&pdev->dev, gc, NULL);
71}
72
73static const struct of_device_id __maybe_unused clps711x_gpio_ids[] = {
74	{ .compatible = "cirrus,clps711x-gpio" },
75	{ }
76};
77MODULE_DEVICE_TABLE(of, clps711x_gpio_ids);
78
79static struct platform_driver clps711x_gpio_driver = {
80	.driver	= {
81		.name		= "clps711x-gpio",
82		.of_match_table	= of_match_ptr(clps711x_gpio_ids),
83	},
84	.probe	= clps711x_gpio_probe,
85};
86module_platform_driver(clps711x_gpio_driver);
87
88MODULE_LICENSE("GPL");
89MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
90MODULE_DESCRIPTION("CLPS711X GPIO driver");
91MODULE_ALIAS("platform:clps711x-gpio");