tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * MOXA ART SoCs GPIO driver.
3 *
4 * Copyright (C) 2013 Jonas Jensen
5 *
6 * Jonas Jensen <jonas.jensen@gmail.com>
7 *
8 * This file is licensed under the terms of the GNU General Public
9 * License version 2. This program is licensed "as is" without any
10 * warranty of any kind, whether express or implied.
11 */
12
13#include <linux/err.h>
14#include <linux/init.h>
15#include <linux/irq.h>
16#include <linux/io.h>
17#include <linux/platform_device.h>
18#include <linux/of_address.h>
19#include <linux/of_gpio.h>
20#include <linux/pinctrl/consumer.h>
21#include <linux/delay.h>
22#include <linux/timer.h>
23#include <linux/bitops.h>
24#include <linux/gpio/driver.h>
25
26#define GPIO_DATA_OUT 0x00
27#define GPIO_DATA_IN 0x04
28#define GPIO_PIN_DIRECTION 0x08
29
30static int moxart_gpio_probe(struct platform_device *pdev)
31{
32 struct device *dev = &pdev->dev;
33 struct resource *res;
34 struct gpio_chip *gc;
35 void __iomem *base;
36 int ret;
37
38 gc = devm_kzalloc(dev, sizeof(*gc), GFP_KERNEL);
39 if (!gc)
40 return -ENOMEM;
41
42 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
43 base = devm_ioremap_resource(dev, res);
44 if (IS_ERR(base))
45 return PTR_ERR(base);
46
47 ret = bgpio_init(gc, dev, 4, base + GPIO_DATA_IN,
48 base + GPIO_DATA_OUT, NULL,
49 base + GPIO_PIN_DIRECTION, NULL,
50 BGPIOF_READ_OUTPUT_REG_SET);
51 if (ret) {
52 dev_err(&pdev->dev, "bgpio_init failed\n");
53 return ret;
54 }
55
56 gc->label = "moxart-gpio";
57 gc->request = gpiochip_generic_request;
58 gc->free = gpiochip_generic_free;
59 gc->base = 0;
60 gc->owner = THIS_MODULE;
61
62 ret = devm_gpiochip_add_data(dev, gc, NULL);
63 if (ret) {
64 dev_err(dev, "%s: gpiochip_add failed\n",
65 dev->of_node->full_name);
66 return ret;
67 }
68
69 return ret;
70}
71
72static const struct of_device_id moxart_gpio_match[] = {
73 { .compatible = "moxa,moxart-gpio" },
74 { }
75};
76
77static struct platform_driver moxart_gpio_driver = {
78 .driver = {
79 .name = "moxart-gpio",
80 .of_match_table = moxart_gpio_match,
81 },
82 .probe = moxart_gpio_probe,
83};
84builtin_platform_driver(moxart_gpio_driver);