drivers/gpio/gpio-iop.c

   1 /*
   2  * arch/arm/plat-iop/gpio.c
   3  * GPIO handling for Intel IOP3xx processors.
   4  *
   5  * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or (at
  10  * your option) any later version.
  11  */
  12
  13 #include <linux/err.h>
  14 #include <linux/module.h>
  15 #include <linux/gpio/driver.h>
  16 #include <linux/platform_device.h>
  17
  18 #define IOP3XX_GPOE     0x0000
  19 #define IOP3XX_GPID     0x0004
  20 #define IOP3XX_GPOD     0x0008
  21
  22 static int iop3xx_gpio_probe(struct platform_device *pdev)
  23 {
  24         struct gpio_chip *gc;
  25         void __iomem *base;
  26         int err;
  27
  28         gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
  29         if (!gc)
  30                 return -ENOMEM;
  31
  32         base = devm_platform_ioremap_resource(pdev, 0);
  33         if (IS_ERR(base))
  34                 return PTR_ERR(base);
  35
  36         err = bgpio_init(gc, &pdev->dev, 1, base + IOP3XX_GPID,
  37                          base + IOP3XX_GPOD, NULL, NULL, base + IOP3XX_GPOE, 0);
  38         if (err)
  39                 return err;
  40
  41         gc->base = 0;
  42         gc->owner = THIS_MODULE;
  43
  44         return devm_gpiochip_add_data(&pdev->dev, gc, NULL);
  45 }
  46
  47 static struct platform_driver iop3xx_gpio_driver = {
  48         .driver = {
  49                 .name = "gpio-iop",
  50         },
  51         .probe = iop3xx_gpio_probe,
  52 };
  53
  54 static int __init iop3xx_gpio_init(void)
  55 {
  56         return platform_driver_register(&iop3xx_gpio_driver);
  57 }
  58 arch_initcall(iop3xx_gpio_init);
  59
  60 MODULE_DESCRIPTION("GPIO handling for Intel IOP3xx processors");
  61 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
  62 MODULE_LICENSE("GPL");