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/gpio.h>
14#include <linux/module.h>
15#include <linux/basic_mmio_gpio.h>
16#include <linux/platform_device.h>
17
18static int clps711x_gpio_probe(struct platform_device *pdev)
19{
20	struct device_node *np = pdev->dev.of_node;
21	void __iomem *dat, *dir;
22	struct bgpio_chip *bgc;
23	struct resource *res;
24	int err, id = np ? of_alias_get_id(np, "gpio") : pdev->id;
25
26	if ((id < 0) || (id > 4))
27		return -ENODEV;
28
29	bgc = devm_kzalloc(&pdev->dev, sizeof(*bgc), GFP_KERNEL);
30	if (!bgc)
31		return -ENOMEM;
32
33	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
34	dat = devm_ioremap_resource(&pdev->dev, res);
35	if (IS_ERR(dat))
36		return PTR_ERR(dat);
37
38	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
39	dir = devm_ioremap_resource(&pdev->dev, res);
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(bgc, &pdev->dev, 1, dat, NULL, NULL,
47				 NULL, dir, 0);
48		break;
49	default:
50		err = bgpio_init(bgc, &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		bgc->gc.ngpio = 3;
62		break;
63	default:
64		break;
65	}
66
67	bgc->gc.base = id * 8;
68	bgc->gc.owner = THIS_MODULE;
69	platform_set_drvdata(pdev, bgc);
70
71	return gpiochip_add(&bgc->gc);
72}
73
74static int clps711x_gpio_remove(struct platform_device *pdev)
75{
76	struct bgpio_chip *bgc = platform_get_drvdata(pdev);
77
78	return bgpio_remove(bgc);
79}
80
81static const struct of_device_id __maybe_unused clps711x_gpio_ids[] = {
82	{ .compatible = "cirrus,clps711x-gpio" },
83	{ }
84};
85MODULE_DEVICE_TABLE(of, clps711x_gpio_ids);
86
87static struct platform_driver clps711x_gpio_driver = {
88	.driver	= {
89		.name		= "clps711x-gpio",
90		.of_match_table	= of_match_ptr(clps711x_gpio_ids),
91	},
92	.probe	= clps711x_gpio_probe,
93	.remove	= clps711x_gpio_remove,
94};
95module_platform_driver(clps711x_gpio_driver);
96
97MODULE_LICENSE("GPL");
98MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
99MODULE_DESCRIPTION("CLPS711X GPIO driver");
100MODULE_ALIAS("platform:clps711x-gpio");
101