target/linux/ramips/files/arch/mips/ralink/common/dev-gpio-buttons.c

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