gpio-moxart.c
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/*
* MOXA ART SoCs GPIO driver.
*
* Copyright (C) 2013 Jonas Jensen
*
* Jonas Jensen <jonas.jensen@gmail.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/err.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_gpio.h>
#include <linux/pinctrl/consumer.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/bitops.h>
#include <linux/basic_mmio_gpio.h>
#define GPIO_DATA_OUT 0x00
#define GPIO_DATA_IN 0x04
#define GPIO_PIN_DIRECTION 0x08
static int moxart_gpio_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct resource *res;
struct bgpio_chip *bgc;
void __iomem *base;
int ret;
bgc = devm_kzalloc(dev, sizeof(*bgc), GFP_KERNEL);
if (!bgc)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
ret = bgpio_init(bgc, dev, 4, base + GPIO_DATA_IN,
base + GPIO_DATA_OUT, NULL,
base + GPIO_PIN_DIRECTION, NULL,
BGPIOF_READ_OUTPUT_REG_SET);
if (ret) {
dev_err(&pdev->dev, "bgpio_init failed\n");
return ret;
}
bgc->gc.label = "moxart-gpio";
bgc->gc.request = gpiochip_generic_request;
bgc->gc.free = gpiochip_generic_free;
bgc->data = bgc->read_reg(bgc->reg_set);
bgc->gc.base = 0;
bgc->gc.ngpio = 32;
bgc->gc.dev = dev;
bgc->gc.owner = THIS_MODULE;
ret = gpiochip_add(&bgc->gc);
if (ret) {
dev_err(dev, "%s: gpiochip_add failed\n",
dev->of_node->full_name);
return ret;
}
return ret;
}
static const struct of_device_id moxart_gpio_match[] = {
{ .compatible = "moxa,moxart-gpio" },
{ }
};
static struct platform_driver moxart_gpio_driver = {
.driver = {
.name = "moxart-gpio",
.of_match_table = moxart_gpio_match,
},
.probe = moxart_gpio_probe,
};
module_platform_driver(moxart_gpio_driver);
MODULE_DESCRIPTION("MOXART GPIO chip driver");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");