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Commit 43e5e7c6 authored by David Herrmann's avatar David Herrmann Committed by Jiri Kosina
Browse files

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: default avatarDavid Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 5906215b

drivers/hid/Makefile

+3 −0
Original line number Diff line number Diff line
@@ -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

drivers/hid/hid-wiimote-core.c

+5 −0
Original line number Diff line number Diff line
@@ -1161,6 +1161,7 @@ static struct wiimote_data *wiimote_create(struct hid_device *hdev) 


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 */

drivers/hid/hid-wiimote-debug.c

0 → 100644
+52 −0
Original line number Diff line number Diff line 
/*

 * 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);

}

drivers/hid/hid-wiimote.h

+13 −0
Original line number Diff line number Diff line
@@ -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)