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/*
* HID driver for Nintendo Wiimote extension 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/atomic.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include "hid-wiimote.h"
struct wiimote_ext {
struct wiimote_data *wdata;
struct work_struct worker;
atomic_t opened;
atomic_t mp_opened;
bool plugged;
bool motionp;
__u8 ext_type;
};
enum wiiext_type {
WIIEXT_NONE, /* placeholder */
WIIEXT_CLASSIC, /* Nintendo classic controller */
WIIEXT_NUNCHUCK, /* Nintendo nunchuck controller */
};
/* diable all extensions */
static void ext_disable(struct wiimote_ext *ext)
{
unsigned long flags;
__u8 wmem = 0x55;
if (!wiimote_cmd_acquire(ext->wdata)) {
wiimote_cmd_write(ext->wdata, 0xa400f0, &wmem, sizeof(wmem));
wiimote_cmd_release(ext->wdata);
}
spin_lock_irqsave(&ext->wdata->state.lock, flags);
ext->motionp = false;
ext->ext_type = WIIEXT_NONE;
wiiproto_req_drm(ext->wdata, WIIPROTO_REQ_NULL);
spin_unlock_irqrestore(&ext->wdata->state.lock, flags);
}
static bool motionp_read(struct wiimote_ext *ext)
{
__u8 rmem[2], wmem;
ssize_t ret;
bool avail = false;
if (wiimote_cmd_acquire(ext->wdata))
return false;
/* initialize motion plus */
wmem = 0x55;
ret = wiimote_cmd_write(ext->wdata, 0xa600f0, &wmem, sizeof(wmem));
if (ret)
goto error;
/* read motion plus ID */
ret = wiimote_cmd_read(ext->wdata, 0xa600fe, rmem, 2);
if (ret == 2 || rmem[1] == 0x5)
avail = true;
error:
wiimote_cmd_release(ext->wdata);
return avail;
}
static __u8 ext_read(struct wiimote_ext *ext)
{
ssize_t ret;
__u8 rmem[2], wmem;
__u8 type = WIIEXT_NONE;
if (!ext->plugged)
return WIIEXT_NONE;
if (wiimote_cmd_acquire(ext->wdata))
return WIIEXT_NONE;
/* initialize extension */
wmem = 0x55;
ret = wiimote_cmd_write(ext->wdata, 0xa400f0, &wmem, sizeof(wmem));
if (!ret) {
/* disable encryption */
wmem = 0x0;
wiimote_cmd_write(ext->wdata, 0xa400fb, &wmem, sizeof(wmem));
}
/* read extension ID */
ret = wiimote_cmd_read(ext->wdata, 0xa400fe, rmem, 2);
if (ret == 2) {
if (rmem[0] == 0 && rmem[1] == 0)
type = WIIEXT_NUNCHUCK;
else if (rmem[0] == 0x01 && rmem[1] == 0x01)
type = WIIEXT_CLASSIC;
}
wiimote_cmd_release(ext->wdata);
return type;
}
static void ext_enable(struct wiimote_ext *ext, bool motionp, __u8 ext_type)
{
unsigned long flags;
__u8 wmem;
int ret;
if (motionp) {
if (wiimote_cmd_acquire(ext->wdata))
return;
if (ext_type == WIIEXT_CLASSIC)
wmem = 0x07;
else if (ext_type == WIIEXT_NUNCHUCK)
wmem = 0x05;
else
wmem = 0x04;
ret = wiimote_cmd_write(ext->wdata, 0xa600fe, &wmem, sizeof(wmem));
wiimote_cmd_release(ext->wdata);
if (ret)
return;
}
spin_lock_irqsave(&ext->wdata->state.lock, flags);
ext->motionp = motionp;
ext->ext_type = ext_type;
wiiproto_req_drm(ext->wdata, WIIPROTO_REQ_NULL);
spin_unlock_irqrestore(&ext->wdata->state.lock, flags);
}
static void wiiext_worker(struct work_struct *work)
{
struct wiimote_ext *ext = container_of(work, struct wiimote_ext,
worker);
bool motionp;
__u8 ext_type;
ext_disable(ext);
motionp = motionp_read(ext);
ext_type = ext_read(ext);
ext_enable(ext, motionp, ext_type);
}
/* schedule work only once, otherwise mark for reschedule */
static void wiiext_schedule(struct wiimote_ext *ext)
{
queue_work(system_nrt_wq, &ext->worker);
}
/*
* Reacts on extension port events
* Whenever the driver gets an event from the wiimote that an extension has been
* plugged or unplugged, this funtion shall be called. It checks what extensions
* are connected and initializes and activates them.
* This can be called in atomic context. The initialization is done in a
* separate worker thread. The state.lock spinlock must be held by the caller.
*/
void wiiext_event(struct wiimote_data *wdata, bool plugged)
{
if (!wdata->ext)
return;
if (wdata->ext->plugged == plugged)
return;
wdata->ext->plugged = plugged;
/*
* We need to call wiiext_schedule(wdata->ext) here, however, the
* extension initialization logic is not fully understood and so
* automatic initialization is not supported, yet.
*/
}
/*
* Returns true if the current DRM mode should contain extension data and false
* if there is no interest in extension data.
* All supported extensions send 6 byte extension data so any DRM that contains
* extension bytes is fine.
* The caller must hold the state.lock spinlock.
*/
bool wiiext_active(struct wiimote_data *wdata)
{
if (!wdata->ext)
return false;
return wdata->ext->motionp || wdata->ext->ext_type;
}
/* Initializes the extension driver of a wiimote */
int wiiext_init(struct wiimote_data *wdata)
{
struct wiimote_ext *ext;
unsigned long flags;
ext = kzalloc(sizeof(*ext), GFP_KERNEL);
if (!ext)
return -ENOMEM;
ext->wdata = wdata;
INIT_WORK(&ext->worker, wiiext_worker);
spin_lock_irqsave(&wdata->state.lock, flags);
wdata->ext = ext;
spin_unlock_irqrestore(&wdata->state.lock, flags);
return 0;
}
/* Deinitializes the extension driver of a wiimote */
void wiiext_deinit(struct wiimote_data *wdata)
{
struct wiimote_ext *ext = wdata->ext;
unsigned long flags;
if (!ext)
return;
/*
* We first unset wdata->ext to avoid further input from the wiimote
* core. The worker thread does not access this pointer so it is not
* affected by this.
* We kill the worker after this so it does not get respawned during
* deinitialization.
*/
spin_lock_irqsave(&wdata->state.lock, flags);
wdata->ext = NULL;
spin_unlock_irqrestore(&wdata->state.lock, flags);
cancel_work_sync(&ext->worker);
kfree(ext);
}
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