xref: /linux/drivers/gpio/gpio-clps711x.c (revision 55fe14ab872ab7a60944332c79640d561e93dfe8)
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 
18 static int clps711x_gpio_probe(struct platform_device *pdev)
19 {
20 	void __iomem *dat, *dir;
21 	struct bgpio_chip *bgc;
22 	struct resource *res;
23 	int err, id = pdev->id;
24 
25 	if ((id < 0) || (id > 4))
26 		return -ENODEV;
27 
28 	bgc = devm_kzalloc(&pdev->dev, sizeof(*bgc), GFP_KERNEL);
29 	if (!bgc)
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(bgc, &pdev->dev, 1, dat, NULL, NULL,
46 				 NULL, dir, 0);
47 		break;
48 	default:
49 		err = bgpio_init(bgc, &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 		bgc->gc.ngpio = 3;
61 		break;
62 	default:
63 		break;
64 	}
65 
66 	bgc->gc.base = id * 8;
67 	platform_set_drvdata(pdev, bgc);
68 
69 	return gpiochip_add(&bgc->gc);
70 }
71 
72 static int clps711x_gpio_remove(struct platform_device *pdev)
73 {
74 	struct bgpio_chip *bgc = platform_get_drvdata(pdev);
75 
76 	return bgpio_remove(bgc);
77 }
78 
79 static struct platform_driver clps711x_gpio_driver = {
80 	.driver	= {
81 		.name	= "clps711x-gpio",
82 		.owner	= THIS_MODULE,
83 	},
84 	.probe	= clps711x_gpio_probe,
85 	.remove	= clps711x_gpio_remove,
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