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/gpio.h>
 14#include <linux/module.h>
 15#include <linux/basic_mmio_gpio.h>
 16#include <linux/platform_device.h>
 17
 18static int clps711x_gpio_probe(struct platform_device *pdev)
 19{
 20	struct device_node *np = pdev->dev.of_node;
 21	void __iomem *dat, *dir;
 22	struct bgpio_chip *bgc;
 23	struct resource *res;
 24	int err, id = np ? of_alias_get_id(np, "gpio") : pdev->id;
 25
 26	if ((id < 0) || (id > 4))
 27		return -ENODEV;
 28
 29	bgc = devm_kzalloc(&pdev->dev, sizeof(*bgc), GFP_KERNEL);
 30	if (!bgc)
 31		return -ENOMEM;
 32
 33	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 34	dat = devm_ioremap_resource(&pdev->dev, res);
 35	if (IS_ERR(dat))
 36		return PTR_ERR(dat);
 37
 38	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 39	dir = devm_ioremap_resource(&pdev->dev, res);
 40	if (IS_ERR(dir))
 41		return PTR_ERR(dir);
 42
 43	switch (id) {
 44	case 3:
 45		/* PORTD is inverted logic for direction register */
 46		err = bgpio_init(bgc, &pdev->dev, 1, dat, NULL, NULL,
 47				 NULL, dir, 0);
 48		break;
 49	default:
 50		err = bgpio_init(bgc, &pdev->dev, 1, dat, NULL, NULL,
 51				 dir, NULL, 0);
 52		break;
 53	}
 54
 55	if (err)
 56		return err;
 57
 58	switch (id) {
 59	case 4:
 60		/* PORTE is 3 lines only */
 61		bgc->gc.ngpio = 3;
 62		break;
 63	default:
 64		break;
 65	}
 66
 67	bgc->gc.base = id * 8;
 68	bgc->gc.owner = THIS_MODULE;
 69	platform_set_drvdata(pdev, bgc);
 70
 71	return gpiochip_add(&bgc->gc);
 72}
 73
 74static int clps711x_gpio_remove(struct platform_device *pdev)
 75{
 76	struct bgpio_chip *bgc = platform_get_drvdata(pdev);
 77
 78	return bgpio_remove(bgc);
 79}
 80
 81static const struct of_device_id __maybe_unused clps711x_gpio_ids[] = {
 82	{ .compatible = "cirrus,clps711x-gpio" },
 83	{ }
 84};
 85MODULE_DEVICE_TABLE(of, clps711x_gpio_ids);
 86
 87static struct platform_driver clps711x_gpio_driver = {
 88	.driver	= {
 89		.name		= "clps711x-gpio",
 90		.owner		= THIS_MODULE,
 91		.of_match_table	= of_match_ptr(clps711x_gpio_ids),
 92	},
 93	.probe	= clps711x_gpio_probe,
 94	.remove	= clps711x_gpio_remove,
 95};
 96module_platform_driver(clps711x_gpio_driver);
 97
 98MODULE_LICENSE("GPL");
 99MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
100MODULE_DESCRIPTION("CLPS711X GPIO driver");
101MODULE_ALIAS("platform:clps711x-gpio");