gpio-clps711x.c
2.37 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
/*
* CLPS711X GPIO driver
*
* Copyright (C) 2012,2013 Alexander Shiyan <shc_work@mail.ru>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/basic_mmio_gpio.h>
#include <linux/platform_device.h>
static int clps711x_gpio_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
void __iomem *dat, *dir;
struct bgpio_chip *bgc;
struct resource *res;
int err, id = np ? of_alias_get_id(np, "gpio") : pdev->id;
if ((id < 0) || (id > 4))
return -ENODEV;
bgc = devm_kzalloc(&pdev->dev, sizeof(*bgc), GFP_KERNEL);
if (!bgc)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
dat = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(dat))
return PTR_ERR(dat);
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
dir = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(dir))
return PTR_ERR(dir);
switch (id) {
case 3:
/* PORTD is inverted logic for direction register */
err = bgpio_init(bgc, &pdev->dev, 1, dat, NULL, NULL,
NULL, dir, 0);
break;
default:
err = bgpio_init(bgc, &pdev->dev, 1, dat, NULL, NULL,
dir, NULL, 0);
break;
}
if (err)
return err;
switch (id) {
case 4:
/* PORTE is 3 lines only */
bgc->gc.ngpio = 3;
break;
default:
break;
}
bgc->gc.base = id * 8;
bgc->gc.owner = THIS_MODULE;
platform_set_drvdata(pdev, bgc);
return gpiochip_add(&bgc->gc);
}
static int clps711x_gpio_remove(struct platform_device *pdev)
{
struct bgpio_chip *bgc = platform_get_drvdata(pdev);
return bgpio_remove(bgc);
}
static const struct of_device_id __maybe_unused clps711x_gpio_ids[] = {
{ .compatible = "cirrus,clps711x-gpio" },
{ }
};
MODULE_DEVICE_TABLE(of, clps711x_gpio_ids);
static struct platform_driver clps711x_gpio_driver = {
.driver = {
.name = "clps711x-gpio",
.of_match_table = of_match_ptr(clps711x_gpio_ids),
},
.probe = clps711x_gpio_probe,
.remove = clps711x_gpio_remove,
};
module_platform_driver(clps711x_gpio_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
MODULE_DESCRIPTION("CLPS711X GPIO driver");
MODULE_ALIAS("platform:clps711x-gpio");