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;
24
25	if (!np)
26		return -ENODEV;
27
28	id = of_alias_get_id(np, "gpio");
29	if ((id < 0) || (id > 4))
30		return -ENODEV;
31
32	gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
33	if (!gc)
34		return -ENOMEM;
35
36	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
37	dat = devm_ioremap_resource(&pdev->dev, res);
38	if (IS_ERR(dat))
39		return PTR_ERR(dat);
40
41	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
42	dir = devm_ioremap_resource(&pdev->dev, res);
43	if (IS_ERR(dir))
44		return PTR_ERR(dir);
45
46	switch (id) {
47	case 3:
48		/* PORTD is inverted logic for direction register */
49		err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
50				 NULL, dir, 0);
51		break;
52	default:
53		err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
54				 dir, NULL, 0);
55		break;
56	}
57
58	if (err)
59		return err;
60
61	switch (id) {
62	case 4:
63		/* PORTE is 3 lines only */
64		gc->ngpio = 3;
65		break;
66	default:
67		break;
68	}
69
70	gc->base = -1;
71	gc->owner = THIS_MODULE;
72	platform_set_drvdata(pdev, gc);
73
74	return devm_gpiochip_add_data(&pdev->dev, gc, NULL);
75}
76
77static const struct of_device_id __maybe_unused clps711x_gpio_ids[] = {
78	{ .compatible = "cirrus,ep7209-gpio" },
79	{ }
80};
81MODULE_DEVICE_TABLE(of, clps711x_gpio_ids);
82
83static struct platform_driver clps711x_gpio_driver = {
84	.driver	= {
85		.name		= "clps711x-gpio",
86		.of_match_table	= of_match_ptr(clps711x_gpio_ids),
87	},
88	.probe	= clps711x_gpio_probe,
89};
90module_platform_driver(clps711x_gpio_driver);
91
92MODULE_LICENSE("GPL");
93MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
94MODULE_DESCRIPTION("CLPS711X GPIO driver");
95MODULE_ALIAS("platform:clps711x-gpio");