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>

diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index 5fab4e632eabb8cbc32cacb95f7ec80de7190bac..15c1a84537ebcd17e73b7f0fc10210e87381d211 100644 (file)
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -29,6 +29,9 @@ hid-wiimote-y         := hid-wiimote-core.o
 ifdef CONFIG_HID_WIIMOTE_EXT
        hid-wiimote-y   += hid-wiimote-ext.o
 endif
+ifdef CONFIG_DEBUG_FS
+       hid-wiimote-y   += hid-wiimote-debug.o
+endif
 
 obj-$(CONFIG_HID_A4TECH)       += hid-a4tech.o
 obj-$(CONFIG_HID_ACRUX)                += hid-axff.o

diff --git a/drivers/hid/hid-wiimote-core.c b/drivers/hid/hid-wiimote-core.c
index d8ed1ec58e9f300ea75c4d2830c785dcca052bc0..919abbaba84095d5d8b07f695b587e6310fcbcde 100644 (file)
--- a/drivers/hid/hid-wiimote-core.c
+++ b/drivers/hid/hid-wiimote-core.c
@@ -1161,6 +1161,7 @@ err:
 
 static void wiimote_destroy(struct wiimote_data *wdata)
 {
+       wiidebug_deinit(wdata);
        wiiext_deinit(wdata);
        wiimote_leds_destroy(wdata);
 
@@ -1237,6 +1238,10 @@ static int wiimote_hid_probe(struct hid_device *hdev,
        if (ret)
                goto err_free;
 
+       ret = wiidebug_init(wdata);
+       if (ret)
+               goto err_free;
+
        hid_info(hdev, "New device registered\n");
 
        /* by default set led1 after device initialization */

diff --git a/drivers/hid/hid-wiimote-debug.c b/drivers/hid/hid-wiimote-debug.c
new file mode 100644 (file)
index 0000000..6282e3c
--- /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);
+}

diff --git a/drivers/hid/hid-wiimote.h b/drivers/hid/hid-wiimote.h
index 1f3e53a3a148d4b41a0cd3e3698c26cc7a8d0fe6..89b8851dbf1f06a5d580e31f9f7f091a980651c3 100644 (file)
--- a/drivers/hid/hid-wiimote.h
+++ b/drivers/hid/hid-wiimote.h
@@ -74,6 +74,7 @@ struct wiimote_data {
        struct input_dev *ir;
        struct power_supply battery;
        struct wiimote_ext *ext;
+       struct wiimote_debug *debug;
 
        spinlock_t qlock;
        __u8 head;
@@ -137,6 +138,18 @@ static inline void wiiext_handle(void *u, const __u8 *p) { }
 
 #endif
 
+#ifdef CONFIG_DEBUG_FS
+
+extern int wiidebug_init(struct wiimote_data *wdata);
+extern void wiidebug_deinit(struct wiimote_data *wdata);
+
+#else
+
+static inline int wiidebug_init(void *u) { return 0; }
+static inline void wiidebug_deinit(void *u) { }
+
+#endif
+
 /* requires the state.lock spinlock to be held */
 static inline bool wiimote_cmd_pending(struct wiimote_data *wdata, int cmd,
                                                                __u32 opt)