[deliverable/linux.git] / drivers / gpio / gpio-clps711x.c

/*
 *  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 devm_gpiochip_add_data(&pdev->dev, gc, NULL);
}

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,
};
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");
Commit	Line	Data
	1	/*
	2	* CLPS711X GPIO driver
	3	*
	4	* Copyright (C) 2012,2013 Alexander Shiyan <shc_work@mail.ru>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*/
	11
	12	#include <linux/err.h>
	13	#include <linux/module.h>
	14	#include <linux/gpio/driver.h>
	15	#include <linux/platform_device.h>
	16
	17	static int clps711x_gpio_probe(struct platform_device *pdev)
	18	{
	19	struct device_node *np = pdev->dev.of_node;
	20	void __iomem dat, dir;
	21	struct gpio_chip *gc;
	22	struct resource *res;
	23	int err, id = np ? of_alias_get_id(np, "gpio") : pdev->id;
	24
	25	if ((id < 0) \|\| (id > 4))
	26	return -ENODEV;
	27
	28	gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
	29	if (!gc)
	30	return -ENOMEM;
	31
	32	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	33	dat = devm_ioremap_resource(&pdev->dev, res);
	34	if (IS_ERR(dat))
	35	return PTR_ERR(dat);
	36
	37	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	38	dir = devm_ioremap_resource(&pdev->dev, res);
	39	if (IS_ERR(dir))
	40	return PTR_ERR(dir);
	41
	42	switch (id) {
	43	case 3:
	44	/* PORTD is inverted logic for direction register */
	45	err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
	46	NULL, dir, 0);
	47	break;
	48	default:
	49	err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
	50	dir, NULL, 0);
	51	break;
	52	}
	53
	54	if (err)
	55	return err;
	56
	57	switch (id) {
	58	case 4:
	59	/* PORTE is 3 lines only */
	60	gc->ngpio = 3;
	61	break;
	62	default:
	63	break;
	64	}
	65
	66	gc->base = id * 8;
	67	gc->owner = THIS_MODULE;
	68	platform_set_drvdata(pdev, gc);
	69
	70	return devm_gpiochip_add_data(&pdev->dev, gc, NULL);
	71	}
	72
	73	static const struct of_device_id __maybe_unused clps711x_gpio_ids[] = {
	74	{ .compatible = "cirrus,clps711x-gpio" },
	75	{ }
	76	};
	77	MODULE_DEVICE_TABLE(of, clps711x_gpio_ids);
	78
	79	static struct platform_driver clps711x_gpio_driver = {
	80	.driver = {
	81	.name = "clps711x-gpio",
	82	.of_match_table = of_match_ptr(clps711x_gpio_ids),
	83	},
	84	.probe = clps711x_gpio_probe,
	85	};
	86	module_platform_driver(clps711x_gpio_driver);
	87
	88	MODULE_LICENSE("GPL");
	89	MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
	90	MODULE_DESCRIPTION("CLPS711X GPIO driver");
	91	MODULE_ALIAS("platform:clps711x-gpio");