drivers/hid/hid-wiimote-debug.c

   1 /*
   2  * Debug support for HID Nintendo Wiimote devices
   3  * Copyright (c) 2011 David Herrmann
   4  */
   5
   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 as published by the Free
   9  * Software Foundation; either version 2 of the License, or (at your option)
  10  * any later version.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/spinlock.h>
  15 #include "hid-wiimote.h"
  16
  17 struct wiimote_debug {
  18         struct wiimote_data *wdata;
  19 };
  20
  21 int wiidebug_init(struct wiimote_data *wdata)
  22 {
  23         struct wiimote_debug *dbg;
  24         unsigned long flags;
  25
  26         dbg = kzalloc(sizeof(*dbg), GFP_KERNEL);
  27         if (!dbg)
  28                 return -ENOMEM;
  29
  30         dbg->wdata = wdata;
  31
  32         spin_lock_irqsave(&wdata->state.lock, flags);
  33         wdata->debug = dbg;
  34         spin_unlock_irqrestore(&wdata->state.lock, flags);
  35
  36         return 0;
  37 }
  38
  39 void wiidebug_deinit(struct wiimote_data *wdata)
  40 {
  41         struct wiimote_debug *dbg = wdata->debug;
  42         unsigned long flags;
  43
  44         if (!dbg)
  45                 return;
  46
  47         spin_lock_irqsave(&wdata->state.lock, flags);
  48         wdata->debug = NULL;
  49         spin_unlock_irqrestore(&wdata->state.lock, flags);
  50
  51         kfree(dbg);
  52 }