gpio-clps711x.c 2.18 KB
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/*
 *  CLPS711X GPIO driver
 *
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 *  Copyright (C) 2012,2013 Alexander Shiyan <shc_work@mail.ru>
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 *
 * 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.
 */

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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/gpio/driver.h>
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#include <linux/platform_device.h>

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static int clps711x_gpio_probe(struct platform_device *pdev)
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{
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	struct device_node *np = pdev->dev.of_node;
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	void __iomem *dat, *dir;
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	struct gpio_chip *gc;
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	struct resource *res;
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	int err, id;
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	if (!np)
		return -ENODEV;

	id = of_alias_get_id(np, "gpio");
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	if ((id < 0) || (id > 4))
		return -ENODEV;
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	gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
	if (!gc)
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		return -ENOMEM;
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	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 */
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		err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
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				 NULL, dir, 0);
		break;
	default:
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		err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
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				 dir, NULL, 0);
		break;
	}
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	if (err)
		return err;
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	switch (id) {
	case 4:
		/* PORTE is 3 lines only */
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		gc->ngpio = 3;
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		break;
	default:
		break;
	}
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	gc->base = -1;
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	gc->owner = THIS_MODULE;
	platform_set_drvdata(pdev, gc);
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	return devm_gpiochip_add_data(&pdev->dev, gc, NULL);
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}

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static const struct of_device_id __maybe_unused clps711x_gpio_ids[] = {
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	{ .compatible = "cirrus,ep7209-gpio" },
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	{ }
};
MODULE_DEVICE_TABLE(of, clps711x_gpio_ids);

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static struct platform_driver clps711x_gpio_driver = {
	.driver	= {
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		.name		= "clps711x-gpio",
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		.of_match_table	= of_match_ptr(clps711x_gpio_ids),
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	},
	.probe	= clps711x_gpio_probe,
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};
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module_platform_driver(clps711x_gpio_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
MODULE_DESCRIPTION("CLPS711X GPIO driver");
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MODULE_ALIAS("platform:clps711x-gpio");