LXR linux/drivers/gpio/gpio-clps711x.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *  CLPS711X GPIO driver
   4 *
   5 *  Copyright (C) 2012,2013 Alexander Shiyan <shc_work@mail.ru>
   6 */
   7
   8#include <linux/err.h>
   9#include <linux/module.h>
  10#include <linux/gpio/driver.h>
  11#include <linux/platform_device.h>
  12
  13static int clps711x_gpio_probe(struct platform_device *pdev)
  14{
  15        struct device_node *np = pdev->dev.of_node;
  16        void __iomem *dat, *dir;
  17        struct gpio_chip *gc;
  18        int err, id;
  19
  20        if (!np)
  21                return -ENODEV;
  22
  23        id = of_alias_get_id(np, "gpio");
  24        if ((id < 0) || (id > 4))
  25                return -ENODEV;
  26
  27        gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
  28        if (!gc)
  29                return -ENOMEM;
  30
  31        dat = devm_platform_ioremap_resource(pdev, 0);
  32        if (IS_ERR(dat))
  33                return PTR_ERR(dat);
  34
  35        dir = devm_platform_ioremap_resource(pdev, 1);
  36        if (IS_ERR(dir))
  37                return PTR_ERR(dir);
  38
  39        switch (id) {
  40        case 3:
  41                /* PORTD is inverted logic for direction register */
  42                err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
  43                                 NULL, dir, 0);
  44                break;
  45        default:
  46                err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
  47                                 dir, NULL, 0);
  48                break;
  49        }
  50
  51        if (err)
  52                return err;
  53
  54        switch (id) {
  55        case 4:
  56                /* PORTE is 3 lines only */
  57                gc->ngpio = 3;
  58                break;
  59        default:
  60                break;
  61        }
  62
  63        gc->base = -1;
  64        gc->owner = THIS_MODULE;
  65        platform_set_drvdata(pdev, gc);
  66
  67        return devm_gpiochip_add_data(&pdev->dev, gc, NULL);
  68}
  69
  70static const struct of_device_id __maybe_unused clps711x_gpio_ids[] = {
  71        { .compatible = "cirrus,ep7209-gpio" },
  72        { }
  73};
  74MODULE_DEVICE_TABLE(of, clps711x_gpio_ids);
  75
  76static struct platform_driver clps711x_gpio_driver = {
  77        .driver = {
  78                .name           = "clps711x-gpio",
  79                .of_match_table = of_match_ptr(clps711x_gpio_ids),
  80        },
  81        .probe  = clps711x_gpio_probe,
  82};
  83module_platform_driver(clps711x_gpio_driver);
  84
  85MODULE_LICENSE("GPL");
  86MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
  87MODULE_DESCRIPTION("CLPS711X GPIO driver");
  88MODULE_ALIAS("platform:clps711x-gpio");
  89