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authorDavid Herrmann <dh.herrmann@googlemail.com>2011-11-17 14:12:10 +0100
committerJiri Kosina <jkosina@suse.cz>2011-11-22 23:10:26 +0100
commit43e5e7c60ee7039f538ccfaaa4e99829719d9bea (patch)
treec97a33352738f583e8f0c563af733914e02b147a /drivers/hid/hid-wiimote-debug.c
parent5906215bab9fccf7aa2c4305accf0716c4634d69 (diff)
downloadlinux-43e5e7c60ee7039f538ccfaaa4e99829719d9bea.tar.bz2
HID: wiimote: Add debugfs support stubs
Add initializer and deinitializer for debugfs support. This will later allow raw eeprom access and direct DRM modifications to debug wiimote behaviour and further protocol reverse-engineerings. Signed-off-by: David Herrmann <dh.herrmann@googlemail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-wiimote-debug.c')
-rw-r--r--drivers/hid/hid-wiimote-debug.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/drivers/hid/hid-wiimote-debug.c b/drivers/hid/hid-wiimote-debug.c
new file mode 100644
index 000000000000..6282e3c1a362
--- /dev/null
+++ b/drivers/hid/hid-wiimote-debug.c
@@ -0,0 +1,52 @@
+/*
+ * Debug support for HID Nintendo Wiimote devices
+ * Copyright (c) 2011 David Herrmann
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include "hid-wiimote.h"
+
+struct wiimote_debug {
+ struct wiimote_data *wdata;
+};
+
+int wiidebug_init(struct wiimote_data *wdata)
+{
+ struct wiimote_debug *dbg;
+ unsigned long flags;
+
+ dbg = kzalloc(sizeof(*dbg), GFP_KERNEL);
+ if (!dbg)
+ return -ENOMEM;
+
+ dbg->wdata = wdata;
+
+ spin_lock_irqsave(&wdata->state.lock, flags);
+ wdata->debug = dbg;
+ spin_unlock_irqrestore(&wdata->state.lock, flags);
+
+ return 0;
+}
+
+void wiidebug_deinit(struct wiimote_data *wdata)
+{
+ struct wiimote_debug *dbg = wdata->debug;
+ unsigned long flags;
+
+ if (!dbg)
+ return;
+
+ spin_lock_irqsave(&wdata->state.lock, flags);
+ wdata->debug = NULL;
+ spin_unlock_irqrestore(&wdata->state.lock, flags);
+
+ kfree(dbg);
+}