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Jonas Jensen0299b772013-11-29 12:11:34 +01001/*
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>
Jonas Jensen0299b772013-11-29 12:11:34 +010017#include <linux/platform_device.h>
18#include <linux/module.h>
19#include <linux/of_address.h>
20#include <linux/of_gpio.h>
21#include <linux/pinctrl/consumer.h>
22#include <linux/delay.h>
23#include <linux/timer.h>
24#include <linux/bitops.h>
Linus Walleij0f4630f2015-12-04 14:02:58 +010025#include <linux/gpio/driver.h>
Jonas Jensen0299b772013-11-29 12:11:34 +010026
27#define GPIO_DATA_OUT 0x00
28#define GPIO_DATA_IN 0x04
29#define GPIO_PIN_DIRECTION 0x08
30
Jonas Jensen0299b772013-11-29 12:11:34 +010031static int moxart_gpio_probe(struct platform_device *pdev)
32{
33 struct device *dev = &pdev->dev;
34 struct resource *res;
Linus Walleij0f4630f2015-12-04 14:02:58 +010035 struct gpio_chip *gc;
Kamlakant Patel3c01b9a2014-12-01 17:39:34 +053036 void __iomem *base;
Jonas Jensen0299b772013-11-29 12:11:34 +010037 int ret;
38
Linus Walleij0f4630f2015-12-04 14:02:58 +010039 gc = devm_kzalloc(dev, sizeof(*gc), GFP_KERNEL);
40 if (!gc)
Jonas Jensen0299b772013-11-29 12:11:34 +010041 return -ENOMEM;
Jonas Jensen0299b772013-11-29 12:11:34 +010042
43 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
Kamlakant Patel3c01b9a2014-12-01 17:39:34 +053044 base = devm_ioremap_resource(dev, res);
45 if (IS_ERR(base))
46 return PTR_ERR(base);
Jonas Jensen0299b772013-11-29 12:11:34 +010047
Linus Walleij0f4630f2015-12-04 14:02:58 +010048 ret = bgpio_init(gc, dev, 4, base + GPIO_DATA_IN,
Vladimir Zapolskiyf3066332015-04-29 18:35:00 +030049 base + GPIO_DATA_OUT, NULL,
50 base + GPIO_PIN_DIRECTION, NULL,
51 BGPIOF_READ_OUTPUT_REG_SET);
Kamlakant Patel3c01b9a2014-12-01 17:39:34 +053052 if (ret) {
53 dev_err(&pdev->dev, "bgpio_init failed\n");
54 return ret;
55 }
Jonas Jensen0299b772013-11-29 12:11:34 +010056
Linus Walleij0f4630f2015-12-04 14:02:58 +010057 gc->label = "moxart-gpio";
58 gc->request = gpiochip_generic_request;
59 gc->free = gpiochip_generic_free;
Arnd Bergmann780c43d2016-01-07 14:55:34 +010060 gc->bgpio_data = gc->read_reg(gc->reg_set);
Linus Walleij0f4630f2015-12-04 14:02:58 +010061 gc->base = 0;
62 gc->ngpio = 32;
63 gc->parent = dev;
64 gc->owner = THIS_MODULE;
Kamlakant Patel3c01b9a2014-12-01 17:39:34 +053065
Linus Walleij0f4630f2015-12-04 14:02:58 +010066 ret = gpiochip_add_data(gc, NULL);
Jonas Jensen0299b772013-11-29 12:11:34 +010067 if (ret) {
68 dev_err(dev, "%s: gpiochip_add failed\n",
69 dev->of_node->full_name);
70 return ret;
71 }
72
Kamlakant Patel3c01b9a2014-12-01 17:39:34 +053073 return ret;
Jonas Jensen0299b772013-11-29 12:11:34 +010074}
75
76static const struct of_device_id moxart_gpio_match[] = {
77 { .compatible = "moxa,moxart-gpio" },
78 { }
79};
80
81static struct platform_driver moxart_gpio_driver = {
82 .driver = {
83 .name = "moxart-gpio",
Jonas Jensen0299b772013-11-29 12:11:34 +010084 .of_match_table = moxart_gpio_match,
85 },
86 .probe = moxart_gpio_probe,
87};
88module_platform_driver(moxart_gpio_driver);
89
90MODULE_DESCRIPTION("MOXART GPIO chip driver");
91MODULE_LICENSE("GPL");
92MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");