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

   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
  17static 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
  73static const struct of_device_id __maybe_unused clps711x_gpio_ids[] = {
  74        { .compatible = "cirrus,clps711x-gpio" },
  75        { }
  76};
  77MODULE_DEVICE_TABLE(of, clps711x_gpio_ids);
  78
  79static 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};
  86module_platform_driver(clps711x_gpio_driver);
  87
  88MODULE_LICENSE("GPL");
  89MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
  90MODULE_DESCRIPTION("CLPS711X GPIO driver");
  91MODULE_ALIAS("platform:clps711x-gpio");
  92