arch/mips/ath79/dev-gpio-buttons.c

   1 /*
   2  *  Atheros AR71XX/AR724X/AR913X GPIO button support
   3  *
   4  *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
   5  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify it
   8  *  under the terms of the GNU General Public License version 2 as published
   9  *  by the Free Software Foundation.
  10  */
  11
  12 #include "linux/init.h"
  13 #include "linux/slab.h"
  14 #include <linux/platform_device.h>
  15
  16 #include "dev-gpio-buttons.h"
  17
  18 void __init ath79_register_gpio_keys_polled(int id,
  19                                             unsigned poll_interval,
  20                                             unsigned nbuttons,
  21                                             struct gpio_keys_button *buttons)
  22 {
  23         struct platform_device *pdev;
  24         struct gpio_keys_platform_data pdata;
  25         struct gpio_keys_button *p;
  26         int err;
  27
  28         p = kmalloc(nbuttons * sizeof(*p), GFP_KERNEL);
  29         if (!p)
  30                 return;
  31
  32         memcpy(p, buttons, nbuttons * sizeof(*p));
  33
  34         pdev = platform_device_alloc("gpio-keys-polled", id);
  35         if (!pdev)
  36                 goto err_free_buttons;
  37
  38         memset(&pdata, 0, sizeof(pdata));
  39         pdata.poll_interval = poll_interval;
  40         pdata.nbuttons = nbuttons;
  41         pdata.buttons = p;
  42
  43         err = platform_device_add_data(pdev, &pdata, sizeof(pdata));
  44         if (err)
  45                 goto err_put_pdev;
  46
  47         err = platform_device_add(pdev);
  48         if (err)
  49                 goto err_put_pdev;
  50
  51         return;
  52
  53 err_put_pdev:
  54         platform_device_put(pdev);
  55
  56 err_free_buttons:
  57         kfree(p);
  58 }