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
  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;
  24
  25         if (!np)
  26                 return -ENODEV;
  27
  28         id = of_alias_get_id(np, "gpio");
  29         if ((id < 0) || (id > 4))
  30                 return -ENODEV;
  31
  32         gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
  33         if (!gc)
  34                 return -ENOMEM;
  35
  36         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  37         dat = devm_ioremap_resource(&pdev->dev, res);
  38         if (IS_ERR(dat))
  39                 return PTR_ERR(dat);
  40
  41         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
  42         dir = devm_ioremap_resource(&pdev->dev, res);
  43         if (IS_ERR(dir))
  44                 return PTR_ERR(dir);
  45
  46         switch (id) {
  47         case 3:
  48                 /* PORTD is inverted logic for direction register */
  49                 err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
  50                                  NULL, dir, 0);
  51                 break;
  52         default:
  53                 err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
  54                                  dir, NULL, 0);
  55                 break;
  56         }
  57
  58         if (err)
  59                 return err;
  60
  61         switch (id) {
  62         case 4:
  63                 /* PORTE is 3 lines only */
  64                 gc->ngpio = 3;
  65                 break;
  66         default:
  67                 break;
  68         }
  69
  70         gc->base = -1;
  71         gc->owner = THIS_MODULE;
  72         platform_set_drvdata(pdev, gc);
  73
  74         return devm_gpiochip_add_data(&pdev->dev, gc, NULL);
  75 }
  76
  77 static const struct of_device_id __maybe_unused clps711x_gpio_ids[] = {
  78         { .compatible = "cirrus,ep7209-gpio" },
  79         { }
  80 };
  81 MODULE_DEVICE_TABLE(of, clps711x_gpio_ids);
  82
  83 static struct platform_driver clps711x_gpio_driver = {
  84         .driver = {
  85                 .name           = "clps711x-gpio",
  86                 .of_match_table = of_match_ptr(clps711x_gpio_ids),
  87         },
  88         .probe  = clps711x_gpio_probe,
  89 };
  90 module_platform_driver(clps711x_gpio_driver);
  91
  92 MODULE_LICENSE("GPL");
  93 MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
  94 MODULE_DESCRIPTION("CLPS711X GPIO driver");
  95 MODULE_ALIAS("platform:clps711x-gpio");