tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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");