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/*
* 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/module.h>
#include <linux/gpio/driver.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 gpio_chip *gc;
struct resource *res;
int err, id = np ? of_alias_get_id(np, "gpio") : pdev->id;
if ((id < 0) || (id > 4))
return -ENODEV;
gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
if (!gc)
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(gc, &pdev->dev, 1, dat, NULL, NULL,
NULL, dir, 0);
break;
default:
err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
dir, NULL, 0);
break;
}
if (err)
return err;
switch (id) {
case 4:
/* PORTE is 3 lines only */
gc->ngpio = 3;
break;
default:
break;
}
gc->base = id * 8;
gc->owner = THIS_MODULE;
platform_set_drvdata(pdev, gc);
return gpiochip_add_data(gc, NULL);
}
static int clps711x_gpio_remove(struct platform_device *pdev)
{
struct gpio_chip *gc = platform_get_drvdata(pdev);
gpiochip_remove(gc);
return 0;
}
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");
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