/*
   * Device Modules for Nintendo Wii / Wii U HID Driver
   * Copyright (c) 2011-2013 David Herrmann <dh.herrmann@gmail.com>
   */
  
  /*
   * 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.
   */
  
  /*
   * Wiimote Modules
   * Nintendo devices provide different peripherals and many new devices lack
   * initial features like the IR camera. Therefore, each peripheral device is
   * implemented as an independent module and we probe on each device only the
   * modules for the hardware that really is available.
   *
   * Module registration is sequential. Unregistration is done in reverse order.
   * After device detection, the needed modules are loaded. Users can trigger
   * re-detection which causes all modules to be unloaded and then reload the
   * modules for the new detected device.
   *
   * wdata->input is a shared input device. It is always initialized prior to
   * module registration. If at least one registered module is marked as
   * WIIMOD_FLAG_INPUT, then the input device will get registered after all
   * modules were registered.
   * Please note that it is unregistered _before_ the "remove" callbacks are
   * called. This guarantees that no input interaction is done, anymore. However,
   * the wiimote core keeps a reference to the input device so it is freed only
   * after all modules were removed. It is safe to send events to unregistered
   * input devices.
   */
  
  #include <linux/device.h>
  #include <linux/hid.h>
  #include <linux/input.h>
  #include <linux/spinlock.h>
  #include "hid-wiimote.h"
  
  /*
   * Keys
   * The initial Wii Remote provided a bunch of buttons that are reported as
   * part of the core protocol. Many later devices dropped these and report
   * invalid data in the core button reports. Load this only on devices which
   * correctly send button reports.
   * It uses the shared input device.
   */
  
  static const __u16 wiimod_keys_map[] = {
  	KEY_LEFT,	/* WIIPROTO_KEY_LEFT */
  	KEY_RIGHT,	/* WIIPROTO_KEY_RIGHT */
  	KEY_UP,		/* WIIPROTO_KEY_UP */
  	KEY_DOWN,	/* WIIPROTO_KEY_DOWN */
  	KEY_NEXT,	/* WIIPROTO_KEY_PLUS */
  	KEY_PREVIOUS,	/* WIIPROTO_KEY_MINUS */
  	BTN_1,		/* WIIPROTO_KEY_ONE */
  	BTN_2,		/* WIIPROTO_KEY_TWO */
  	BTN_A,		/* WIIPROTO_KEY_A */
  	BTN_B,		/* WIIPROTO_KEY_B */
  	BTN_MODE,	/* WIIPROTO_KEY_HOME */
  };
  
  static void wiimod_keys_in_keys(struct wiimote_data *wdata, const __u8 *keys)
  {
  	input_report_key(wdata->input, wiimod_keys_map[WIIPROTO_KEY_LEFT],
  							!!(keys[0] & 0x01));
  	input_report_key(wdata->input, wiimod_keys_map[WIIPROTO_KEY_RIGHT],
  							!!(keys[0] & 0x02));
  	input_report_key(wdata->input, wiimod_keys_map[WIIPROTO_KEY_DOWN],
  							!!(keys[0] & 0x04));
  	input_report_key(wdata->input, wiimod_keys_map[WIIPROTO_KEY_UP],
  							!!(keys[0] & 0x08));
  	input_report_key(wdata->input, wiimod_keys_map[WIIPROTO_KEY_PLUS],
  							!!(keys[0] & 0x10));
  	input_report_key(wdata->input, wiimod_keys_map[WIIPROTO_KEY_TWO],
  							!!(keys[1] & 0x01));
  	input_report_key(wdata->input, wiimod_keys_map[WIIPROTO_KEY_ONE],
  							!!(keys[1] & 0x02));
  	input_report_key(wdata->input, wiimod_keys_map[WIIPROTO_KEY_B],
  							!!(keys[1] & 0x04));
  	input_report_key(wdata->input, wiimod_keys_map[WIIPROTO_KEY_A],
  							!!(keys[1] & 0x08));
  	input_report_key(wdata->input, wiimod_keys_map[WIIPROTO_KEY_MINUS],
  							!!(keys[1] & 0x10));
  	input_report_key(wdata->input, wiimod_keys_map[WIIPROTO_KEY_HOME],
  							!!(keys[1] & 0x80));
  	input_sync(wdata->input);
  }
  
  static int wiimod_keys_probe(const struct wiimod_ops *ops,
  			     struct wiimote_data *wdata)
  {
  	unsigned int i;
  
  	set_bit(EV_KEY, wdata->input->evbit);
  	for (i = 0; i < WIIPROTO_KEY_COUNT; ++i)
  		set_bit(wiimod_keys_map[i], wdata->input->keybit);
  
  	return 0;
  }
  
  static const struct wiimod_ops wiimod_keys = {
  	.flags = WIIMOD_FLAG_INPUT,
  	.arg = 0,
  	.probe = wiimod_keys_probe,
  	.remove = NULL,
  	.in_keys = wiimod_keys_in_keys,
  };
  
  /*
   * Rumble
   * Nearly all devices provide a rumble feature. A small motor for
   * force-feedback effects. We provide an FF_RUMBLE memless ff device on the
   * shared input device if this module is loaded.
   * The rumble motor is controlled via a flag on almost every output report so
   * the wiimote core handles the rumble flag. But if a device doesn't provide
   * the rumble motor, this flag shouldn't be set.
   */
  
  /* used by wiimod_rumble and wiipro_rumble */
  static void wiimod_rumble_worker(struct work_struct *work)
  {
  	struct wiimote_data *wdata = container_of(work, struct wiimote_data,
  						  rumble_worker);
  
  	spin_lock_irq(&wdata->state.lock);
  	wiiproto_req_rumble(wdata, wdata->state.cache_rumble);
  	spin_unlock_irq(&wdata->state.lock);
  }
  
  static int wiimod_rumble_play(struct input_dev *dev, void *data,
  			      struct ff_effect *eff)
  {
  	struct wiimote_data *wdata = input_get_drvdata(dev);
  	__u8 value;
  
  	/*
  	 * The wiimote supports only a single rumble motor so if any magnitude
  	 * is set to non-zero then we start the rumble motor. If both are set to
  	 * zero, we stop the rumble motor.
  	 */
  
  	if (eff->u.rumble.strong_magnitude || eff->u.rumble.weak_magnitude)
  		value = 1;
  	else
  		value = 0;
  
  	/* Locking state.lock here might deadlock with input_event() calls.
  	 * schedule_work acts as barrier. Merging multiple changes is fine. */
  	wdata->state.cache_rumble = value;
  	schedule_work(&wdata->rumble_worker);
  
  	return 0;
  }
  
  static int wiimod_rumble_probe(const struct wiimod_ops *ops,
  			       struct wiimote_data *wdata)
  {
  	INIT_WORK(&wdata->rumble_worker, wiimod_rumble_worker);
  
  	set_bit(FF_RUMBLE, wdata->input->ffbit);
  	if (input_ff_create_memless(wdata->input, NULL, wiimod_rumble_play))
  		return -ENOMEM;
  
  	return 0;
  }
  
  static void wiimod_rumble_remove(const struct wiimod_ops *ops,
  				 struct wiimote_data *wdata)
  {
  	unsigned long flags;
  
  	cancel_work_sync(&wdata->rumble_worker);
  
  	spin_lock_irqsave(&wdata->state.lock, flags);
  	wiiproto_req_rumble(wdata, 0);
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  }
  
  static const struct wiimod_ops wiimod_rumble = {
  	.flags = WIIMOD_FLAG_INPUT,
  	.arg = 0,
  	.probe = wiimod_rumble_probe,
  	.remove = wiimod_rumble_remove,
  };
  
  /*
   * Battery
   * 1 byte of battery capacity information is sent along every protocol status
   * report. The wiimote core caches it but we try to update it on every
   * user-space request.
   * This is supported by nearly every device so it's almost always enabled.
   */
  
  static enum power_supply_property wiimod_battery_props[] = {
  	POWER_SUPPLY_PROP_CAPACITY,
  	POWER_SUPPLY_PROP_SCOPE,
  };
  
  static int wiimod_battery_get_property(struct power_supply *psy,
  				       enum power_supply_property psp,
  				       union power_supply_propval *val)
  {
  	struct wiimote_data *wdata = container_of(psy, struct wiimote_data,
  						  battery);
  	int ret = 0, state;
  	unsigned long flags;
  
  	if (psp == POWER_SUPPLY_PROP_SCOPE) {
  		val->intval = POWER_SUPPLY_SCOPE_DEVICE;
  		return 0;
  	} else if (psp != POWER_SUPPLY_PROP_CAPACITY) {
  		return -EINVAL;
  	}
  
  	ret = wiimote_cmd_acquire(wdata);
  	if (ret)
  		return ret;
  
  	spin_lock_irqsave(&wdata->state.lock, flags);
  	wiimote_cmd_set(wdata, WIIPROTO_REQ_SREQ, 0);
  	wiiproto_req_status(wdata);
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  
  	wiimote_cmd_wait(wdata);
  	wiimote_cmd_release(wdata);
  
  	spin_lock_irqsave(&wdata->state.lock, flags);
  	state = wdata->state.cmd_battery;
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  
  	val->intval = state * 100 / 255;
  	return ret;
  }
  
  static int wiimod_battery_probe(const struct wiimod_ops *ops,
  				struct wiimote_data *wdata)
  {
  	int ret;
  
  	wdata->battery.properties = wiimod_battery_props;
  	wdata->battery.num_properties = ARRAY_SIZE(wiimod_battery_props);
  	wdata->battery.get_property = wiimod_battery_get_property;
  	wdata->battery.type = POWER_SUPPLY_TYPE_BATTERY;
  	wdata->battery.use_for_apm = 0;
  	wdata->battery.name = kasprintf(GFP_KERNEL, "wiimote_battery_%s",
  					wdata->hdev->uniq);
  	if (!wdata->battery.name)
  		return -ENOMEM;
  
  	ret = power_supply_register(&wdata->hdev->dev, &wdata->battery);
  	if (ret) {
  		hid_err(wdata->hdev, "cannot register battery device
  ");
  		goto err_free;
  	}
  
  	power_supply_powers(&wdata->battery, &wdata->hdev->dev);
  	return 0;
  
  err_free:
  	kfree(wdata->battery.name);
  	wdata->battery.name = NULL;
  	return ret;
  }
  
  static void wiimod_battery_remove(const struct wiimod_ops *ops,
  				  struct wiimote_data *wdata)
  {
  	if (!wdata->battery.name)
  		return;
  
  	power_supply_unregister(&wdata->battery);
  	kfree(wdata->battery.name);
  	wdata->battery.name = NULL;
  }
  
  static const struct wiimod_ops wiimod_battery = {
  	.flags = 0,
  	.arg = 0,
  	.probe = wiimod_battery_probe,
  	.remove = wiimod_battery_remove,
  };
  
  /*
   * LED
   * 0 to 4 player LEDs are supported by devices. The "arg" field of the
   * wiimod_ops structure specifies which LED this module controls. This allows
   * to register a limited number of LEDs.
   * State is managed by wiimote core.
   */
  
  static enum led_brightness wiimod_led_get(struct led_classdev *led_dev)
  {
  	struct wiimote_data *wdata;
  	struct device *dev = led_dev->dev->parent;
  	int i;
  	unsigned long flags;
  	bool value = false;
  
  	wdata = hid_get_drvdata(container_of(dev, struct hid_device, dev));
  
  	for (i = 0; i < 4; ++i) {
  		if (wdata->leds[i] == led_dev) {
  			spin_lock_irqsave(&wdata->state.lock, flags);
  			value = wdata->state.flags & WIIPROTO_FLAG_LED(i + 1);
  			spin_unlock_irqrestore(&wdata->state.lock, flags);
  			break;
  		}
  	}
  
  	return value ? LED_FULL : LED_OFF;
  }
  
  static void wiimod_led_set(struct led_classdev *led_dev,
  			   enum led_brightness value)
  {
  	struct wiimote_data *wdata;
  	struct device *dev = led_dev->dev->parent;
  	int i;
  	unsigned long flags;
  	__u8 state, flag;
  
  	wdata = hid_get_drvdata(container_of(dev, struct hid_device, dev));
  
  	for (i = 0; i < 4; ++i) {
  		if (wdata->leds[i] == led_dev) {
  			flag = WIIPROTO_FLAG_LED(i + 1);
  			spin_lock_irqsave(&wdata->state.lock, flags);
  			state = wdata->state.flags;
  			if (value == LED_OFF)
  				wiiproto_req_leds(wdata, state & ~flag);
  			else
  				wiiproto_req_leds(wdata, state | flag);
  			spin_unlock_irqrestore(&wdata->state.lock, flags);
  			break;
  		}
  	}
  }
  
  static int wiimod_led_probe(const struct wiimod_ops *ops,
  			    struct wiimote_data *wdata)
  {
  	struct device *dev = &wdata->hdev->dev;
  	size_t namesz = strlen(dev_name(dev)) + 9;
  	struct led_classdev *led;
  	unsigned long flags;
  	char *name;
  	int ret;
  
  	led = kzalloc(sizeof(struct led_classdev) + namesz, GFP_KERNEL);
  	if (!led)
  		return -ENOMEM;
  
  	name = (void*)&led[1];
  	snprintf(name, namesz, "%s:blue:p%lu", dev_name(dev), ops->arg);
  	led->name = name;
  	led->brightness = 0;
  	led->max_brightness = 1;
  	led->brightness_get = wiimod_led_get;
  	led->brightness_set = wiimod_led_set;
  
  	wdata->leds[ops->arg] = led;
  	ret = led_classdev_register(dev, led);
  	if (ret)
  		goto err_free;
  
  	/* enable LED1 to stop initial LED-blinking */
  	if (ops->arg == 0) {
  		spin_lock_irqsave(&wdata->state.lock, flags);
  		wiiproto_req_leds(wdata, WIIPROTO_FLAG_LED1);
  		spin_unlock_irqrestore(&wdata->state.lock, flags);
  	}
  
  	return 0;
  
  err_free:
  	wdata->leds[ops->arg] = NULL;
  	kfree(led);
  	return ret;
  }
  
  static void wiimod_led_remove(const struct wiimod_ops *ops,
  			      struct wiimote_data *wdata)
  {
  	if (!wdata->leds[ops->arg])
  		return;
  
  	led_classdev_unregister(wdata->leds[ops->arg]);
  	kfree(wdata->leds[ops->arg]);
  	wdata->leds[ops->arg] = NULL;
  }
  
  static const struct wiimod_ops wiimod_leds[4] = {
  	{
  		.flags = 0,
  		.arg = 0,
  		.probe = wiimod_led_probe,
  		.remove = wiimod_led_remove,
  	},
  	{
  		.flags = 0,
  		.arg = 1,
  		.probe = wiimod_led_probe,
  		.remove = wiimod_led_remove,
  	},
  	{
  		.flags = 0,
  		.arg = 2,
  		.probe = wiimod_led_probe,
  		.remove = wiimod_led_remove,
  	},
  	{
  		.flags = 0,
  		.arg = 3,
  		.probe = wiimod_led_probe,
  		.remove = wiimod_led_remove,
  	},
  };
  
  /*
   * Accelerometer
   * 3 axis accelerometer data is part of nearly all DRMs. If not supported by a
   * device, it's mostly cleared to 0. This module parses this data and provides
   * it via a separate input device.
   */
  
  static void wiimod_accel_in_accel(struct wiimote_data *wdata,
  				  const __u8 *accel)
  {
  	__u16 x, y, z;
  
  	if (!(wdata->state.flags & WIIPROTO_FLAG_ACCEL))
  		return;
  
  	/*
  	 * payload is: BB BB XX YY ZZ
  	 * Accelerometer data is encoded into 3 10bit values. XX, YY and ZZ
  	 * contain the upper 8 bits of each value. The lower 2 bits are
  	 * contained in the buttons data BB BB.
  	 * Bits 6 and 7 of the first buttons byte BB is the lower 2 bits of the
  	 * X accel value. Bit 5 of the second buttons byte is the 2nd bit of Y
  	 * accel value and bit 6 is the second bit of the Z value.
  	 * The first bit of Y and Z values is not available and always set to 0.
  	 * 0x200 is returned on no movement.
  	 */
  
  	x = accel[2] << 2;
  	y = accel[3] << 2;
  	z = accel[4] << 2;
  
  	x |= (accel[0] >> 5) & 0x3;
  	y |= (accel[1] >> 4) & 0x2;
  	z |= (accel[1] >> 5) & 0x2;
  
  	input_report_abs(wdata->accel, ABS_RX, x - 0x200);
  	input_report_abs(wdata->accel, ABS_RY, y - 0x200);
  	input_report_abs(wdata->accel, ABS_RZ, z - 0x200);
  	input_sync(wdata->accel);
  }
  
  static int wiimod_accel_open(struct input_dev *dev)
  {
  	struct wiimote_data *wdata = input_get_drvdata(dev);
  	unsigned long flags;
  
  	spin_lock_irqsave(&wdata->state.lock, flags);
  	wiiproto_req_accel(wdata, true);
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  
  	return 0;
  }
  
  static void wiimod_accel_close(struct input_dev *dev)
  {
  	struct wiimote_data *wdata = input_get_drvdata(dev);
  	unsigned long flags;
  
  	spin_lock_irqsave(&wdata->state.lock, flags);
  	wiiproto_req_accel(wdata, false);
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  }
  
  static int wiimod_accel_probe(const struct wiimod_ops *ops,
  			      struct wiimote_data *wdata)
  {
  	int ret;
  
  	wdata->accel = input_allocate_device();
  	if (!wdata->accel)
  		return -ENOMEM;
  
  	input_set_drvdata(wdata->accel, wdata);
  	wdata->accel->open = wiimod_accel_open;
  	wdata->accel->close = wiimod_accel_close;
  	wdata->accel->dev.parent = &wdata->hdev->dev;
  	wdata->accel->id.bustype = wdata->hdev->bus;
  	wdata->accel->id.vendor = wdata->hdev->vendor;
  	wdata->accel->id.product = wdata->hdev->product;
  	wdata->accel->id.version = wdata->hdev->version;
  	wdata->accel->name = WIIMOTE_NAME " Accelerometer";
  
  	set_bit(EV_ABS, wdata->accel->evbit);
  	set_bit(ABS_RX, wdata->accel->absbit);
  	set_bit(ABS_RY, wdata->accel->absbit);
  	set_bit(ABS_RZ, wdata->accel->absbit);
  	input_set_abs_params(wdata->accel, ABS_RX, -500, 500, 2, 4);
  	input_set_abs_params(wdata->accel, ABS_RY, -500, 500, 2, 4);
  	input_set_abs_params(wdata->accel, ABS_RZ, -500, 500, 2, 4);
  
  	ret = input_register_device(wdata->accel);
  	if (ret) {
  		hid_err(wdata->hdev, "cannot register input device
  ");
  		goto err_free;
  	}
  
  	return 0;
  
  err_free:
  	input_free_device(wdata->accel);
  	wdata->accel = NULL;
  	return ret;
  }
  
  static void wiimod_accel_remove(const struct wiimod_ops *ops,
  				struct wiimote_data *wdata)
  {
  	if (!wdata->accel)
  		return;
  
  	input_unregister_device(wdata->accel);
  	wdata->accel = NULL;
  }
  
  static const struct wiimod_ops wiimod_accel = {
  	.flags = 0,
  	.arg = 0,
  	.probe = wiimod_accel_probe,
  	.remove = wiimod_accel_remove,
  	.in_accel = wiimod_accel_in_accel,
  };
  
  /*
   * IR Cam
   * Up to 4 IR sources can be tracked by a normal Wii Remote. The IR cam needs
   * to be initialized with a fairly complex procedure and consumes a lot of
   * power. Therefore, as long as no application uses the IR input device, it is
   * kept offline.
   * Nearly no other device than the normal Wii Remotes supports the IR cam so
   * you can disable this module for these devices.
   */
  
  static void wiimod_ir_in_ir(struct wiimote_data *wdata, const __u8 *ir,
  			    bool packed, unsigned int id)
  {
  	__u16 x, y;
  	__u8 xid, yid;
  	bool sync = false;
  
  	if (!(wdata->state.flags & WIIPROTO_FLAGS_IR))
  		return;
  
  	switch (id) {
  	case 0:
  		xid = ABS_HAT0X;
  		yid = ABS_HAT0Y;
  		break;
  	case 1:
  		xid = ABS_HAT1X;
  		yid = ABS_HAT1Y;
  		break;
  	case 2:
  		xid = ABS_HAT2X;
  		yid = ABS_HAT2Y;
  		break;
  	case 3:
  		xid = ABS_HAT3X;
  		yid = ABS_HAT3Y;
  		sync = true;
  		break;
  	default:
  		return;
  	}
  
  	/*
  	 * Basic IR data is encoded into 3 bytes. The first two bytes are the
  	 * lower 8 bit of the X/Y data, the 3rd byte contains the upper 2 bits
  	 * of both.
  	 * If data is packed, then the 3rd byte is put first and slightly
  	 * reordered. This allows to interleave packed and non-packed data to
  	 * have two IR sets in 5 bytes instead of 6.
  	 * The resulting 10bit X/Y values are passed to the ABS_HAT? input dev.
  	 */
  
  	if (packed) {
  		x = ir[1] | ((ir[0] & 0x03) << 8);
  		y = ir[2] | ((ir[0] & 0x0c) << 6);
  	} else {
  		x = ir[0] | ((ir[2] & 0x30) << 4);
  		y = ir[1] | ((ir[2] & 0xc0) << 2);
  	}
  
  	input_report_abs(wdata->ir, xid, x);
  	input_report_abs(wdata->ir, yid, y);
  
  	if (sync)
  		input_sync(wdata->ir);
  }
  
  static int wiimod_ir_change(struct wiimote_data *wdata, __u16 mode)
  {
  	int ret;
  	unsigned long flags;
  	__u8 format = 0;
  	static const __u8 data_enable[] = { 0x01 };
  	static const __u8 data_sens1[] = { 0x02, 0x00, 0x00, 0x71, 0x01,
  						0x00, 0xaa, 0x00, 0x64 };
  	static const __u8 data_sens2[] = { 0x63, 0x03 };
  	static const __u8 data_fin[] = { 0x08 };
  
  	spin_lock_irqsave(&wdata->state.lock, flags);
  
  	if (mode == (wdata->state.flags & WIIPROTO_FLAGS_IR)) {
  		spin_unlock_irqrestore(&wdata->state.lock, flags);
  		return 0;
  	}
  
  	if (mode == 0) {
  		wdata->state.flags &= ~WIIPROTO_FLAGS_IR;
  		wiiproto_req_ir1(wdata, 0);
  		wiiproto_req_ir2(wdata, 0);
  		wiiproto_req_drm(wdata, WIIPROTO_REQ_NULL);
  		spin_unlock_irqrestore(&wdata->state.lock, flags);
  		return 0;
  	}
  
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  
  	ret = wiimote_cmd_acquire(wdata);
  	if (ret)
  		return ret;
  
  	/* send PIXEL CLOCK ENABLE cmd first */
  	spin_lock_irqsave(&wdata->state.lock, flags);
  	wiimote_cmd_set(wdata, WIIPROTO_REQ_IR1, 0);
  	wiiproto_req_ir1(wdata, 0x06);
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  
  	ret = wiimote_cmd_wait(wdata);
  	if (ret)
  		goto unlock;
  	if (wdata->state.cmd_err) {
  		ret = -EIO;
  		goto unlock;
  	}
  
  	/* enable IR LOGIC */
  	spin_lock_irqsave(&wdata->state.lock, flags);
  	wiimote_cmd_set(wdata, WIIPROTO_REQ_IR2, 0);
  	wiiproto_req_ir2(wdata, 0x06);
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  
  	ret = wiimote_cmd_wait(wdata);
  	if (ret)
  		goto unlock;
  	if (wdata->state.cmd_err) {
  		ret = -EIO;
  		goto unlock;
  	}
  
  	/* enable IR cam but do not make it send data, yet */
  	ret = wiimote_cmd_write(wdata, 0xb00030, data_enable,
  							sizeof(data_enable));
  	if (ret)
  		goto unlock;
  
  	/* write first sensitivity block */
  	ret = wiimote_cmd_write(wdata, 0xb00000, data_sens1,
  							sizeof(data_sens1));
  	if (ret)
  		goto unlock;
  
  	/* write second sensitivity block */
  	ret = wiimote_cmd_write(wdata, 0xb0001a, data_sens2,
  							sizeof(data_sens2));
  	if (ret)
  		goto unlock;
  
  	/* put IR cam into desired state */
  	switch (mode) {
  		case WIIPROTO_FLAG_IR_FULL:
  			format = 5;
  			break;
  		case WIIPROTO_FLAG_IR_EXT:
  			format = 3;
  			break;
  		case WIIPROTO_FLAG_IR_BASIC:
  			format = 1;
  			break;
  	}
  	ret = wiimote_cmd_write(wdata, 0xb00033, &format, sizeof(format));
  	if (ret)
  		goto unlock;
  
  	/* make IR cam send data */
  	ret = wiimote_cmd_write(wdata, 0xb00030, data_fin, sizeof(data_fin));
  	if (ret)
  		goto unlock;
  
  	/* request new DRM mode compatible to IR mode */
  	spin_lock_irqsave(&wdata->state.lock, flags);
  	wdata->state.flags &= ~WIIPROTO_FLAGS_IR;
  	wdata->state.flags |= mode & WIIPROTO_FLAGS_IR;
  	wiiproto_req_drm(wdata, WIIPROTO_REQ_NULL);
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  
  unlock:
  	wiimote_cmd_release(wdata);
  	return ret;
  }
  
  static int wiimod_ir_open(struct input_dev *dev)
  {
  	struct wiimote_data *wdata = input_get_drvdata(dev);
  
  	return wiimod_ir_change(wdata, WIIPROTO_FLAG_IR_BASIC);
  }
  
  static void wiimod_ir_close(struct input_dev *dev)
  {
  	struct wiimote_data *wdata = input_get_drvdata(dev);
  
  	wiimod_ir_change(wdata, 0);
  }
  
  static int wiimod_ir_probe(const struct wiimod_ops *ops,
  			   struct wiimote_data *wdata)
  {
  	int ret;
  
  	wdata->ir = input_allocate_device();
  	if (!wdata->ir)
  		return -ENOMEM;
  
  	input_set_drvdata(wdata->ir, wdata);
  	wdata->ir->open = wiimod_ir_open;
  	wdata->ir->close = wiimod_ir_close;
  	wdata->ir->dev.parent = &wdata->hdev->dev;
  	wdata->ir->id.bustype = wdata->hdev->bus;
  	wdata->ir->id.vendor = wdata->hdev->vendor;
  	wdata->ir->id.product = wdata->hdev->product;
  	wdata->ir->id.version = wdata->hdev->version;
  	wdata->ir->name = WIIMOTE_NAME " IR";
  
  	set_bit(EV_ABS, wdata->ir->evbit);
  	set_bit(ABS_HAT0X, wdata->ir->absbit);
  	set_bit(ABS_HAT0Y, wdata->ir->absbit);
  	set_bit(ABS_HAT1X, wdata->ir->absbit);
  	set_bit(ABS_HAT1Y, wdata->ir->absbit);
  	set_bit(ABS_HAT2X, wdata->ir->absbit);
  	set_bit(ABS_HAT2Y, wdata->ir->absbit);
  	set_bit(ABS_HAT3X, wdata->ir->absbit);
  	set_bit(ABS_HAT3Y, wdata->ir->absbit);
  	input_set_abs_params(wdata->ir, ABS_HAT0X, 0, 1023, 2, 4);
  	input_set_abs_params(wdata->ir, ABS_HAT0Y, 0, 767, 2, 4);
  	input_set_abs_params(wdata->ir, ABS_HAT1X, 0, 1023, 2, 4);
  	input_set_abs_params(wdata->ir, ABS_HAT1Y, 0, 767, 2, 4);
  	input_set_abs_params(wdata->ir, ABS_HAT2X, 0, 1023, 2, 4);
  	input_set_abs_params(wdata->ir, ABS_HAT2Y, 0, 767, 2, 4);
  	input_set_abs_params(wdata->ir, ABS_HAT3X, 0, 1023, 2, 4);
  	input_set_abs_params(wdata->ir, ABS_HAT3Y, 0, 767, 2, 4);
  
  	ret = input_register_device(wdata->ir);
  	if (ret) {
  		hid_err(wdata->hdev, "cannot register input device
  ");
  		goto err_free;
  	}
  
  	return 0;
  
  err_free:
  	input_free_device(wdata->ir);
  	wdata->ir = NULL;
  	return ret;
  }
  
  static void wiimod_ir_remove(const struct wiimod_ops *ops,
  			     struct wiimote_data *wdata)
  {
  	if (!wdata->ir)
  		return;
  
  	input_unregister_device(wdata->ir);
  	wdata->ir = NULL;
  }
  
  static const struct wiimod_ops wiimod_ir = {
  	.flags = 0,
  	.arg = 0,
  	.probe = wiimod_ir_probe,
  	.remove = wiimod_ir_remove,
  	.in_ir = wiimod_ir_in_ir,
  };
  
  /*
   * Nunchuk Extension
   * The Nintendo Wii Nunchuk was the first official extension published by
   * Nintendo. It provides two additional keys and a separate accelerometer. It
   * can be hotplugged to standard Wii Remotes.
   */
  
  enum wiimod_nunchuk_keys {
  	WIIMOD_NUNCHUK_KEY_C,
  	WIIMOD_NUNCHUK_KEY_Z,
  	WIIMOD_NUNCHUK_KEY_NUM,
  };
  
  static const __u16 wiimod_nunchuk_map[] = {
  	BTN_C,		/* WIIMOD_NUNCHUK_KEY_C */
  	BTN_Z,		/* WIIMOD_NUNCHUK_KEY_Z */
  };
  
  static void wiimod_nunchuk_in_ext(struct wiimote_data *wdata, const __u8 *ext)
  {
  	__s16 x, y, z, bx, by;
  
  	/*   Byte |   8    7 |  6    5 |  4    3 |  2 |  1  |
  	 *   -----+----------+---------+---------+----+-----+
  	 *    1   |              Button X <7:0>             |
  	 *    2   |              Button Y <7:0>             |
  	 *   -----+----------+---------+---------+----+-----+
  	 *    3   |               Speed X <9:2>             |
  	 *    4   |               Speed Y <9:2>             |
  	 *    5   |               Speed Z <9:2>             |
  	 *   -----+----------+---------+---------+----+-----+
  	 *    6   | Z <1:0>  | Y <1:0> | X <1:0> | BC | BZ  |
  	 *   -----+----------+---------+---------+----+-----+
  	 * Button X/Y is the analog stick. Speed X, Y and Z are the
  	 * accelerometer data in the same format as the wiimote's accelerometer.
  	 * The 6th byte contains the LSBs of the accelerometer data.
  	 * BC and BZ are the C and Z buttons: 0 means pressed
  	 *
  	 * If reported interleaved with motionp, then the layout changes. The
  	 * 5th and 6th byte changes to:
  	 *   -----+-----------------------------------+-----+
  	 *    5   |            Speed Z <9:3>          | EXT |
  	 *   -----+--------+-----+-----+----+----+----+-----+
  	 *    6   |Z <2:1> |Y <1>|X <1>| BC | BZ | 0  |  0  |
  	 *   -----+--------+-----+-----+----+----+----+-----+
  	 * All three accelerometer values lose their LSB. The other data is
  	 * still available but slightly moved.
  	 *
  	 * Center data for button values is 128. Center value for accelerometer
  	 * values it 512 / 0x200
  	 */
  
  	bx = ext[0];
  	by = ext[1];
  	bx -= 128;
  	by -= 128;
  
  	x = ext[2] << 2;
  	y = ext[3] << 2;
  	z = ext[4] << 2;
  
  	if (wdata->state.flags & WIIPROTO_FLAG_MP_ACTIVE) {
  		x |= (ext[5] >> 3) & 0x02;
  		y |= (ext[5] >> 4) & 0x02;
  		z &= ~0x4;
  		z |= (ext[5] >> 5) & 0x06;
  	} else {
  		x |= (ext[5] >> 2) & 0x03;
  		y |= (ext[5] >> 4) & 0x03;
  		z |= (ext[5] >> 6) & 0x03;
  	}
  
  	x -= 0x200;
  	y -= 0x200;
  	z -= 0x200;
  
  	input_report_abs(wdata->extension.input, ABS_HAT0X, bx);
  	input_report_abs(wdata->extension.input, ABS_HAT0Y, by);
  
  	input_report_abs(wdata->extension.input, ABS_RX, x);
  	input_report_abs(wdata->extension.input, ABS_RY, y);
  	input_report_abs(wdata->extension.input, ABS_RZ, z);
  
  	if (wdata->state.flags & WIIPROTO_FLAG_MP_ACTIVE) {
  		input_report_key(wdata->extension.input,
  			wiimod_nunchuk_map[WIIMOD_NUNCHUK_KEY_Z],
  			!(ext[5] & 0x04));
  		input_report_key(wdata->extension.input,
  			wiimod_nunchuk_map[WIIMOD_NUNCHUK_KEY_C],
  			!(ext[5] & 0x08));
  	} else {
  		input_report_key(wdata->extension.input,
  			wiimod_nunchuk_map[WIIMOD_NUNCHUK_KEY_Z],
  			!(ext[5] & 0x01));
  		input_report_key(wdata->extension.input,
  			wiimod_nunchuk_map[WIIMOD_NUNCHUK_KEY_C],
  			!(ext[5] & 0x02));
  	}
  
  	input_sync(wdata->extension.input);
  }
  
  static int wiimod_nunchuk_open(struct input_dev *dev)
  {
  	struct wiimote_data *wdata = input_get_drvdata(dev);
  	unsigned long flags;
  
  	spin_lock_irqsave(&wdata->state.lock, flags);
  	wdata->state.flags |= WIIPROTO_FLAG_EXT_USED;
  	wiiproto_req_drm(wdata, WIIPROTO_REQ_NULL);
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  
  	return 0;
  }
  
  static void wiimod_nunchuk_close(struct input_dev *dev)
  {
  	struct wiimote_data *wdata = input_get_drvdata(dev);
  	unsigned long flags;
  
  	spin_lock_irqsave(&wdata->state.lock, flags);
  	wdata->state.flags &= ~WIIPROTO_FLAG_EXT_USED;
  	wiiproto_req_drm(wdata, WIIPROTO_REQ_NULL);
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  }
  
  static int wiimod_nunchuk_probe(const struct wiimod_ops *ops,
  				struct wiimote_data *wdata)
  {
  	int ret, i;
  
  	wdata->extension.input = input_allocate_device();
  	if (!wdata->extension.input)
  		return -ENOMEM;
  
  	input_set_drvdata(wdata->extension.input, wdata);
  	wdata->extension.input->open = wiimod_nunchuk_open;
  	wdata->extension.input->close = wiimod_nunchuk_close;
  	wdata->extension.input->dev.parent = &wdata->hdev->dev;
  	wdata->extension.input->id.bustype = wdata->hdev->bus;
  	wdata->extension.input->id.vendor = wdata->hdev->vendor;
  	wdata->extension.input->id.product = wdata->hdev->product;
  	wdata->extension.input->id.version = wdata->hdev->version;
  	wdata->extension.input->name = WIIMOTE_NAME " Nunchuk";
  
  	set_bit(EV_KEY, wdata->extension.input->evbit);
  	for (i = 0; i < WIIMOD_NUNCHUK_KEY_NUM; ++i)
  		set_bit(wiimod_nunchuk_map[i],
  			wdata->extension.input->keybit);
  
  	set_bit(EV_ABS, wdata->extension.input->evbit);
  	set_bit(ABS_HAT0X, wdata->extension.input->absbit);
  	set_bit(ABS_HAT0Y, wdata->extension.input->absbit);
  	input_set_abs_params(wdata->extension.input,
  			     ABS_HAT0X, -120, 120, 2, 4);
  	input_set_abs_params(wdata->extension.input,
  			     ABS_HAT0Y, -120, 120, 2, 4);
  	set_bit(ABS_RX, wdata->extension.input->absbit);
  	set_bit(ABS_RY, wdata->extension.input->absbit);
  	set_bit(ABS_RZ, wdata->extension.input->absbit);
  	input_set_abs_params(wdata->extension.input,
  			     ABS_RX, -500, 500, 2, 4);
  	input_set_abs_params(wdata->extension.input,
  			     ABS_RY, -500, 500, 2, 4);
  	input_set_abs_params(wdata->extension.input,
  			     ABS_RZ, -500, 500, 2, 4);
  
  	ret = input_register_device(wdata->extension.input);
  	if (ret)
  		goto err_free;
  
  	return 0;
  
  err_free:
  	input_free_device(wdata->extension.input);
  	wdata->extension.input = NULL;
  	return ret;
  }
  
  static void wiimod_nunchuk_remove(const struct wiimod_ops *ops,
  				  struct wiimote_data *wdata)
  {
  	if (!wdata->extension.input)
  		return;
  
  	input_unregister_device(wdata->extension.input);
  	wdata->extension.input = NULL;
  }
  
  static const struct wiimod_ops wiimod_nunchuk = {
  	.flags = 0,
  	.arg = 0,
  	.probe = wiimod_nunchuk_probe,
  	.remove = wiimod_nunchuk_remove,
  	.in_ext = wiimod_nunchuk_in_ext,
  };
  
  /*
   * Classic Controller
   * Another official extension from Nintendo. It provides a classic
   * gamecube-like controller that can be hotplugged on the Wii Remote.
   * It has several hardware buttons and switches that are all reported via
   * a normal extension device.
   */
  
  enum wiimod_classic_keys {
  	WIIMOD_CLASSIC_KEY_A,
  	WIIMOD_CLASSIC_KEY_B,
  	WIIMOD_CLASSIC_KEY_X,
  	WIIMOD_CLASSIC_KEY_Y,
  	WIIMOD_CLASSIC_KEY_ZL,
  	WIIMOD_CLASSIC_KEY_ZR,
  	WIIMOD_CLASSIC_KEY_PLUS,
  	WIIMOD_CLASSIC_KEY_MINUS,
  	WIIMOD_CLASSIC_KEY_HOME,
  	WIIMOD_CLASSIC_KEY_LEFT,
  	WIIMOD_CLASSIC_KEY_RIGHT,
  	WIIMOD_CLASSIC_KEY_UP,
  	WIIMOD_CLASSIC_KEY_DOWN,
  	WIIMOD_CLASSIC_KEY_LT,
  	WIIMOD_CLASSIC_KEY_RT,
  	WIIMOD_CLASSIC_KEY_NUM,
  };
  
  static const __u16 wiimod_classic_map[] = {
  	BTN_A,		/* WIIMOD_CLASSIC_KEY_A */
  	BTN_B,		/* WIIMOD_CLASSIC_KEY_B */
  	BTN_X,		/* WIIMOD_CLASSIC_KEY_X */
  	BTN_Y,		/* WIIMOD_CLASSIC_KEY_Y */
  	BTN_TL2,	/* WIIMOD_CLASSIC_KEY_ZL */
  	BTN_TR2,	/* WIIMOD_CLASSIC_KEY_ZR */
  	KEY_NEXT,	/* WIIMOD_CLASSIC_KEY_PLUS */
  	KEY_PREVIOUS,	/* WIIMOD_CLASSIC_KEY_MINUS */
  	BTN_MODE,	/* WIIMOD_CLASSIC_KEY_HOME */
  	KEY_LEFT,	/* WIIMOD_CLASSIC_KEY_LEFT */
  	KEY_RIGHT,	/* WIIMOD_CLASSIC_KEY_RIGHT */
  	KEY_UP,		/* WIIMOD_CLASSIC_KEY_UP */
  	KEY_DOWN,	/* WIIMOD_CLASSIC_KEY_DOWN */
  	BTN_TL,		/* WIIMOD_CLASSIC_KEY_LT */
  	BTN_TR,		/* WIIMOD_CLASSIC_KEY_RT */
  };
  
  static void wiimod_classic_in_ext(struct wiimote_data *wdata, const __u8 *ext)
  {
  	__s8 rx, ry, lx, ly, lt, rt;
  
  	/*   Byte |  8  |  7  |  6  |  5  |  4  |  3  |  2  |  1  |
  	 *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
  	 *    1   | RX <5:4>  |              LX <5:0>             |
  	 *    2   | RX <3:2>  |              LY <5:0>             |
  	 *   -----+-----+-----+-----+-----------------------------+
  	 *    3   |RX<1>| LT <5:4>  |         RY <5:1>            |
  	 *   -----+-----+-----------+-----------------------------+
  	 *    4   |     LT <3:1>    |         RT <5:1>            |
  	 *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
  	 *    5   | BDR | BDD | BLT | B-  | BH  | B+  | BRT |  1  |
  	 *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
  	 *    6   | BZL | BB  | BY  | BA  | BX  | BZR | BDL | BDU |
  	 *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
  	 * All buttons are 0 if pressed
  	 * RX and RY are right analog stick
  	 * LX and LY are left analog stick
  	 * LT is left trigger, RT is right trigger
  	 * BLT is 0 if left trigger is fully pressed
  	 * BRT is 0 if right trigger is fully pressed
  	 * BDR, BDD, BDL, BDU form the D-Pad with right, down, left, up buttons
  	 * BZL is left Z button and BZR is right Z button
  	 * B-, BH, B+ are +, HOME and - buttons
  	 * BB, BY, BA, BX are A, B, X, Y buttons
  	 * LSB of RX, RY, LT, and RT are not transmitted and always 0.
  	 *
  	 * With motionp enabled it changes slightly to this:
  	 *   Byte |  8  |  7  |  6  |  5  |  4  |  3  |  2  |  1  |
  	 *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
  	 *    1   | RX <5:4>  |          LX <5:1>           | BDU |
  	 *    2   | RX <3:2>  |          LY <5:1>           | BDL |
  	 *   -----+-----+-----+-----+-----------------------+-----+
  	 *    3   |RX<1>| LT <5:4>  |         RY <5:1>            |
  	 *   -----+-----+-----------+-----------------------------+
  	 *    4   |     LT <3:1>    |         RT <5:1>            |
  	 *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
  	 *    5   | BDR | BDD | BLT | B-  | BH  | B+  | BRT | EXT |
  	 *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
  	 *    6   | BZL | BB  | BY  | BA  | BX  | BZR |  0  |  0  |
  	 *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
  	 * Only the LSBs of LX and LY are lost. BDU and BDL are moved, the rest
  	 * is the same as before.
  	 */
  
  	if (wdata->state.flags & WIIPROTO_FLAG_MP_ACTIVE) {
  		lx = ext[0] & 0x3e;
  		ly = ext[1] & 0x3e;
  	} else {
  		lx = ext[0] & 0x3f;
  		ly = ext[1] & 0x3f;
  	}
  
  	rx = (ext[0] >> 3) & 0x18;
  	rx |= (ext[1] >> 5) & 0x06;
  	rx |= (ext[2] >> 7) & 0x01;
  	ry = ext[2] & 0x1f;
  
  	rt = ext[3] & 0x1f;
  	lt = (ext[2] >> 2) & 0x18;
  	lt |= (ext[3] >> 5) & 0x07;
  
  	rx <<= 1;
  	ry <<= 1;
  	rt <<= 1;
  	lt <<= 1;
  
  	input_report_abs(wdata->extension.input, ABS_HAT1X, lx - 0x20);
  	input_report_abs(wdata->extension.input, ABS_HAT1Y, ly - 0x20);
  	input_report_abs(wdata->extension.input, ABS_HAT2X, rx - 0x20);
  	input_report_abs(wdata->extension.input, ABS_HAT2Y, ry - 0x20);
  	input_report_abs(wdata->extension.input, ABS_HAT3X, rt);
  	input_report_abs(wdata->extension.input, ABS_HAT3Y, lt);
  
  	input_report_key(wdata->extension.input,
  			 wiimod_classic_map[WIIMOD_CLASSIC_KEY_RIGHT],
  			 !(ext[4] & 0x80));
  	input_report_key(wdata->extension.input,
  			 wiimod_classic_map[WIIMOD_CLASSIC_KEY_DOWN],
  			 !(ext[4] & 0x40));
  	input_report_key(wdata->extension.input,
  			 wiimod_classic_map[WIIMOD_CLASSIC_KEY_LT],
  			 !(ext[4] & 0x20));
  	input_report_key(wdata->extension.input,
  			 wiimod_classic_map[WIIMOD_CLASSIC_KEY_MINUS],
  			 !(ext[4] & 0x10));
  	input_report_key(wdata->extension.input,
  			 wiimod_classic_map[WIIMOD_CLASSIC_KEY_HOME],
  			 !(ext[4] & 0x08));
  	input_report_key(wdata->extension.input,
  			 wiimod_classic_map[WIIMOD_CLASSIC_KEY_PLUS],
  			 !(ext[4] & 0x04));
  	input_report_key(wdata->extension.input,
  			 wiimod_classic_map[WIIMOD_CLASSIC_KEY_RT],
  			 !(ext[4] & 0x02));
  	input_report_key(wdata->extension.input,
  			 wiimod_classic_map[WIIMOD_CLASSIC_KEY_ZL],
  			 !(ext[5] & 0x80));
  	input_report_key(wdata->extension.input,
  			 wiimod_classic_map[WIIMOD_CLASSIC_KEY_B],
  			 !(ext[5] & 0x40));
  	input_report_key(wdata->extension.input,
  			 wiimod_classic_map[WIIMOD_CLASSIC_KEY_Y],
  			 !(ext[5] & 0x20));
  	input_report_key(wdata->extension.input,
  			 wiimod_classic_map[WIIMOD_CLASSIC_KEY_A],
  			 !(ext[5] & 0x10));
  	input_report_key(wdata->extension.input,
  			 wiimod_classic_map[WIIMOD_CLASSIC_KEY_X],
  			 !(ext[5] & 0x08));
  	input_report_key(wdata->extension.input,
  			 wiimod_classic_map[WIIMOD_CLASSIC_KEY_ZR],
  			 !(ext[5] & 0x04));
  
  	if (wdata->state.flags & WIIPROTO_FLAG_MP_ACTIVE) {
  		input_report_key(wdata->extension.input,
  			 wiimod_classic_map[WIIMOD_CLASSIC_KEY_LEFT],
  			 !(ext[1] & 0x01));
  		input_report_key(wdata->extension.input,
  			 wiimod_classic_map[WIIMOD_CLASSIC_KEY_UP],
  			 !(ext[0] & 0x01));
  	} else {
  		input_report_key(wdata->extension.input,
  			 wiimod_classic_map[WIIMOD_CLASSIC_KEY_LEFT],
  			 !(ext[5] & 0x02));
  		input_report_key(wdata->extension.input,
  			 wiimod_classic_map[WIIMOD_CLASSIC_KEY_UP],
  			 !(ext[5] & 0x01));
  	}
  
  	input_sync(wdata->extension.input);
  }
  
  static int wiimod_classic_open(struct input_dev *dev)
  {
  	struct wiimote_data *wdata = input_get_drvdata(dev);
  	unsigned long flags;
  
  	spin_lock_irqsave(&wdata->state.lock, flags);
  	wdata->state.flags |= WIIPROTO_FLAG_EXT_USED;
  	wiiproto_req_drm(wdata, WIIPROTO_REQ_NULL);
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  
  	return 0;
  }
  
  static void wiimod_classic_close(struct input_dev *dev)
  {
  	struct wiimote_data *wdata = input_get_drvdata(dev);
  	unsigned long flags;
  
  	spin_lock_irqsave(&wdata->state.lock, flags);
  	wdata->state.flags &= ~WIIPROTO_FLAG_EXT_USED;
  	wiiproto_req_drm(wdata, WIIPROTO_REQ_NULL);
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  }
  
  static int wiimod_classic_probe(const struct wiimod_ops *ops,
  				struct wiimote_data *wdata)
  {
  	int ret, i;
  
  	wdata->extension.input = input_allocate_device();
  	if (!wdata->extension.input)
  		return -ENOMEM;
  
  	input_set_drvdata(wdata->extension.input, wdata);
  	wdata->extension.input->open = wiimod_classic_open;
  	wdata->extension.input->close = wiimod_classic_close;
  	wdata->extension.input->dev.parent = &wdata->hdev->dev;
  	wdata->extension.input->id.bustype = wdata->hdev->bus;
  	wdata->extension.input->id.vendor = wdata->hdev->vendor;
  	wdata->extension.input->id.product = wdata->hdev->product;
  	wdata->extension.input->id.version = wdata->hdev->version;
  	wdata->extension.input->name = WIIMOTE_NAME " Classic Controller";
  
  	set_bit(EV_KEY, wdata->extension.input->evbit);
  	for (i = 0; i < WIIMOD_CLASSIC_KEY_NUM; ++i)
  		set_bit(wiimod_classic_map[i],
  			wdata->extension.input->keybit);
  
  	set_bit(EV_ABS, wdata->extension.input->evbit);
  	set_bit(ABS_HAT1X, wdata->extension.input->absbit);
  	set_bit(ABS_HAT1Y, wdata->extension.input->absbit);
  	set_bit(ABS_HAT2X, wdata->extension.input->absbit);
  	set_bit(ABS_HAT2Y, wdata->extension.input->absbit);
  	set_bit(ABS_HAT3X, wdata->extension.input->absbit);
  	set_bit(ABS_HAT3Y, wdata->extension.input->absbit);
  	input_set_abs_params(wdata->extension.input,
  			     ABS_HAT1X, -30, 30, 1, 1);
  	input_set_abs_params(wdata->extension.input,
  			     ABS_HAT1Y, -30, 30, 1, 1);
  	input_set_abs_params(wdata->extension.input,
  			     ABS_HAT2X, -30, 30, 1, 1);
  	input_set_abs_params(wdata->extension.input,
  			     ABS_HAT2Y, -30, 30, 1, 1);
  	input_set_abs_params(wdata->extension.input,
  			     ABS_HAT3X, -30, 30, 1, 1);
  	input_set_abs_params(wdata->extension.input,
  			     ABS_HAT3Y, -30, 30, 1, 1);
  
  	ret = input_register_device(wdata->extension.input);
  	if (ret)
  		goto err_free;
  
  	return 0;
  
  err_free:
  	input_free_device(wdata->extension.input);
  	wdata->extension.input = NULL;
  	return ret;
  }
  
  static void wiimod_classic_remove(const struct wiimod_ops *ops,
  				  struct wiimote_data *wdata)
  {
  	if (!wdata->extension.input)
  		return;
  
  	input_unregister_device(wdata->extension.input);
  	wdata->extension.input = NULL;
  }
  
  static const struct wiimod_ops wiimod_classic = {
  	.flags = 0,
  	.arg = 0,
  	.probe = wiimod_classic_probe,
  	.remove = wiimod_classic_remove,
  	.in_ext = wiimod_classic_in_ext,
  };
  
  /*
   * Balance Board Extension
   * The Nintendo Wii Balance Board provides four hardware weight sensor plus a
   * single push button. No other peripherals are available. However, the
   * balance-board data is sent via a standard Wii Remote extension. All other
   * data for non-present hardware is zeroed out.
   * Some 3rd party devices react allergic if we try to access normal Wii Remote
   * hardware, so this extension module should be the only module that is loaded
   * on balance boards.
   * The balance board needs 8 bytes extension data instead of basic 6 bytes so
   * it needs the WIIMOD_FLAG_EXT8 flag.
   */
  
  static void wiimod_bboard_in_keys(struct wiimote_data *wdata, const __u8 *keys)
  {
  	input_report_key(wdata->extension.input, BTN_A,
  			 !!(keys[1] & 0x08));
  	input_sync(wdata->extension.input);
  }
  
  static void wiimod_bboard_in_ext(struct wiimote_data *wdata,
  				 const __u8 *ext)
  {
  	__s32 val[4], tmp, div;
  	unsigned int i;
  	struct wiimote_state *s = &wdata->state;
  
  	/*
  	 * Balance board data layout:
  	 *
  	 *   Byte |  8  7  6  5  4  3  2  1  |
  	 *   -----+--------------------------+
  	 *    1   |    Top Right <15:8>      |
  	 *    2   |    Top Right  <7:0>      |
  	 *   -----+--------------------------+
  	 *    3   | Bottom Right <15:8>      |
  	 *    4   | Bottom Right  <7:0>      |
  	 *   -----+--------------------------+
  	 *    5   |     Top Left <15:8>      |
  	 *    6   |     Top Left  <7:0>      |
  	 *   -----+--------------------------+
  	 *    7   |  Bottom Left <15:8>      |
  	 *    8   |  Bottom Left  <7:0>      |
  	 *   -----+--------------------------+
  	 *
  	 * These values represent the weight-measurements of the Wii-balance
  	 * board with 16bit precision.
  	 *
  	 * The balance-board is never reported interleaved with motionp.
  	 */
  
  	val[0] = ext[0];
  	val[0] <<= 8;
  	val[0] |= ext[1];
  
  	val[1] = ext[2];
  	val[1] <<= 8;
  	val[1] |= ext[3];
  
  	val[2] = ext[4];
  	val[2] <<= 8;
  	val[2] |= ext[5];
  
  	val[3] = ext[6];
  	val[3] <<= 8;
  	val[3] |= ext[7];
  
  	/* apply calibration data */
  	for (i = 0; i < 4; i++) {
  		if (val[i] <= s->calib_bboard[i][0]) {
  			tmp = 0;
  		} else if (val[i] < s->calib_bboard[i][1]) {
  			tmp = val[i] - s->calib_bboard[i][0];
  			tmp *= 1700;
  			div = s->calib_bboard[i][1] - s->calib_bboard[i][0];
  			tmp /= div ? div : 1;
  		} else {
  			tmp = val[i] - s->calib_bboard[i][1];
  			tmp *= 1700;
  			div = s->calib_bboard[i][2] - s->calib_bboard[i][1];
  			tmp /= div ? div : 1;
  			tmp += 1700;
  		}
  		val[i] = tmp;
  	}
  
  	input_report_abs(wdata->extension.input, ABS_HAT0X, val[0]);
  	input_report_abs(wdata->extension.input, ABS_HAT0Y, val[1]);
  	input_report_abs(wdata->extension.input, ABS_HAT1X, val[2]);
  	input_report_abs(wdata->extension.input, ABS_HAT1Y, val[3]);
  	input_sync(wdata->extension.input);
  }
  
  static int wiimod_bboard_open(struct input_dev *dev)
  {
  	struct wiimote_data *wdata = input_get_drvdata(dev);
  	unsigned long flags;
  
  	spin_lock_irqsave(&wdata->state.lock, flags);
  	wdata->state.flags |= WIIPROTO_FLAG_EXT_USED;
  	wiiproto_req_drm(wdata, WIIPROTO_REQ_NULL);
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  
  	return 0;
  }
  
  static void wiimod_bboard_close(struct input_dev *dev)
  {
  	struct wiimote_data *wdata = input_get_drvdata(dev);
  	unsigned long flags;
  
  	spin_lock_irqsave(&wdata->state.lock, flags);
  	wdata->state.flags &= ~WIIPROTO_FLAG_EXT_USED;
  	wiiproto_req_drm(wdata, WIIPROTO_REQ_NULL);
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  }
  
  static ssize_t wiimod_bboard_calib_show(struct device *dev,
  					struct device_attribute *attr,
  					char *out)
  {
  	struct wiimote_data *wdata = dev_to_wii(dev);
  	int i, j, ret;
  	__u16 val;
  	__u8 buf[24], offs;
  
  	ret = wiimote_cmd_acquire(wdata);
  	if (ret)
  		return ret;
  
  	ret = wiimote_cmd_read(wdata, 0xa40024, buf, 12);
  	if (ret != 12) {
  		wiimote_cmd_release(wdata);
  		return ret < 0 ? ret : -EIO;
  	}
  	ret = wiimote_cmd_read(wdata, 0xa40024 + 12, buf + 12, 12);
  	if (ret != 12) {
  		wiimote_cmd_release(wdata);
  		return ret < 0 ? ret : -EIO;
  	}
  
  	wiimote_cmd_release(wdata);
  
  	spin_lock_irq(&wdata->state.lock);
  	offs = 0;
  	for (i = 0; i < 3; ++i) {
  		for (j = 0; j < 4; ++j) {
  			wdata->state.calib_bboard[j][i] = buf[offs];
  			wdata->state.calib_bboard[j][i] <<= 8;
  			wdata->state.calib_bboard[j][i] |= buf[offs + 1];
  			offs += 2;
  		}
  	}
  	spin_unlock_irq(&wdata->state.lock);
  
  	ret = 0;
  	for (i = 0; i < 3; ++i) {
  		for (j = 0; j < 4; ++j) {
  			val = wdata->state.calib_bboard[j][i];
  			if (i == 2 && j == 3)
  				ret += sprintf(&out[ret], "%04x
  ", val);
  			else
  				ret += sprintf(&out[ret], "%04x:", val);
  		}
  	}
  
  	return ret;
  }
  
  static DEVICE_ATTR(bboard_calib, S_IRUGO, wiimod_bboard_calib_show, NULL);
  
  static int wiimod_bboard_probe(const struct wiimod_ops *ops,
  			       struct wiimote_data *wdata)
  {
  	int ret, i, j;
  	__u8 buf[24], offs;
  
  	wiimote_cmd_acquire_noint(wdata);
  
  	ret = wiimote_cmd_read(wdata, 0xa40024, buf, 12);
  	if (ret != 12) {
  		wiimote_cmd_release(wdata);
  		return ret < 0 ? ret : -EIO;
  	}
  	ret = wiimote_cmd_read(wdata, 0xa40024 + 12, buf + 12, 12);
  	if (ret != 12) {
  		wiimote_cmd_release(wdata);
  		return ret < 0 ? ret : -EIO;
  	}
  
  	wiimote_cmd_release(wdata);
  
  	offs = 0;
  	for (i = 0; i < 3; ++i) {
  		for (j = 0; j < 4; ++j) {
  			wdata->state.calib_bboard[j][i] = buf[offs];
  			wdata->state.calib_bboard[j][i] <<= 8;
  			wdata->state.calib_bboard[j][i] |= buf[offs + 1];
  			offs += 2;
  		}
  	}
  
  	wdata->extension.input = input_allocate_device();
  	if (!wdata->extension.input)
  		return -ENOMEM;
  
  	ret = device_create_file(&wdata->hdev->dev,
  				 &dev_attr_bboard_calib);
  	if (ret) {
  		hid_err(wdata->hdev, "cannot create sysfs attribute
  ");
  		goto err_free;
  	}
  
  	input_set_drvdata(wdata->extension.input, wdata);
  	wdata->extension.input->open = wiimod_bboard_open;
  	wdata->extension.input->close = wiimod_bboard_close;
  	wdata->extension.input->dev.parent = &wdata->hdev->dev;
  	wdata->extension.input->id.bustype = wdata->hdev->bus;
  	wdata->extension.input->id.vendor = wdata->hdev->vendor;
  	wdata->extension.input->id.product = wdata->hdev->product;
  	wdata->extension.input->id.version = wdata->hdev->version;
  	wdata->extension.input->name = WIIMOTE_NAME " Balance Board";
  
  	set_bit(EV_KEY, wdata->extension.input->evbit);
  	set_bit(BTN_A, wdata->extension.input->keybit);
  
  	set_bit(EV_ABS, wdata->extension.input->evbit);
  	set_bit(ABS_HAT0X, wdata->extension.input->absbit);
  	set_bit(ABS_HAT0Y, wdata->extension.input->absbit);
  	set_bit(ABS_HAT1X, wdata->extension.input->absbit);
  	set_bit(ABS_HAT1Y, wdata->extension.input->absbit);
  	input_set_abs_params(wdata->extension.input,
  			     ABS_HAT0X, 0, 65535, 2, 4);
  	input_set_abs_params(wdata->extension.input,
  			     ABS_HAT0Y, 0, 65535, 2, 4);
  	input_set_abs_params(wdata->extension.input,
  			     ABS_HAT1X, 0, 65535, 2, 4);
  	input_set_abs_params(wdata->extension.input,
  			     ABS_HAT1Y, 0, 65535, 2, 4);
  
  	ret = input_register_device(wdata->extension.input);
  	if (ret)
  		goto err_file;
  
  	return 0;
  
  err_file:
  	device_remove_file(&wdata->hdev->dev,
  			   &dev_attr_bboard_calib);
  err_free:
  	input_free_device(wdata->extension.input);
  	wdata->extension.input = NULL;
  	return ret;
  }
  
  static void wiimod_bboard_remove(const struct wiimod_ops *ops,
  				 struct wiimote_data *wdata)
  {
  	if (!wdata->extension.input)
  		return;
  
  	input_unregister_device(wdata->extension.input);
  	wdata->extension.input = NULL;
  	device_remove_file(&wdata->hdev->dev,
  			   &dev_attr_bboard_calib);
  }
  
  static const struct wiimod_ops wiimod_bboard = {
  	.flags = WIIMOD_FLAG_EXT8,
  	.arg = 0,
  	.probe = wiimod_bboard_probe,
  	.remove = wiimod_bboard_remove,
  	.in_keys = wiimod_bboard_in_keys,
  	.in_ext = wiimod_bboard_in_ext,
  };
  
  /*
   * Pro Controller
   * Released with the Wii U was the Nintendo Wii U Pro Controller. It does not
   * work together with the classic Wii, but only with the new Wii U. However, it
   * uses the same protocol and provides a builtin "classic controller pro"
   * extension, few standard buttons, a rumble motor, 4 LEDs and a battery.
   * We provide all these via a standard extension device as the device doesn't
   * feature an extension port.
   */
  
  enum wiimod_pro_keys {
  	WIIMOD_PRO_KEY_A,
  	WIIMOD_PRO_KEY_B,
  	WIIMOD_PRO_KEY_X,
  	WIIMOD_PRO_KEY_Y,
  	WIIMOD_PRO_KEY_PLUS,
  	WIIMOD_PRO_KEY_MINUS,
  	WIIMOD_PRO_KEY_HOME,
  	WIIMOD_PRO_KEY_LEFT,
  	WIIMOD_PRO_KEY_RIGHT,
  	WIIMOD_PRO_KEY_UP,
  	WIIMOD_PRO_KEY_DOWN,
  	WIIMOD_PRO_KEY_TL,
  	WIIMOD_PRO_KEY_TR,
  	WIIMOD_PRO_KEY_ZL,
  	WIIMOD_PRO_KEY_ZR,
  	WIIMOD_PRO_KEY_THUMBL,
  	WIIMOD_PRO_KEY_THUMBR,
  	WIIMOD_PRO_KEY_NUM,
  };
  
  static const __u16 wiimod_pro_map[] = {
  	BTN_EAST,	/* WIIMOD_PRO_KEY_A */
  	BTN_SOUTH,	/* WIIMOD_PRO_KEY_B */
  	BTN_NORTH,	/* WIIMOD_PRO_KEY_X */
  	BTN_WEST,	/* WIIMOD_PRO_KEY_Y */
  	BTN_START,	/* WIIMOD_PRO_KEY_PLUS */
  	BTN_SELECT,	/* WIIMOD_PRO_KEY_MINUS */
  	BTN_MODE,	/* WIIMOD_PRO_KEY_HOME */
  	BTN_DPAD_LEFT,	/* WIIMOD_PRO_KEY_LEFT */
  	BTN_DPAD_RIGHT,	/* WIIMOD_PRO_KEY_RIGHT */
  	BTN_DPAD_UP,	/* WIIMOD_PRO_KEY_UP */
  	BTN_DPAD_DOWN,	/* WIIMOD_PRO_KEY_DOWN */
  	BTN_TL,		/* WIIMOD_PRO_KEY_TL */
  	BTN_TR,		/* WIIMOD_PRO_KEY_TR */
  	BTN_TL2,	/* WIIMOD_PRO_KEY_ZL */
  	BTN_TR2,	/* WIIMOD_PRO_KEY_ZR */
  	BTN_THUMBL,	/* WIIMOD_PRO_KEY_THUMBL */
  	BTN_THUMBR,	/* WIIMOD_PRO_KEY_THUMBR */
  };
  
  static void wiimod_pro_in_ext(struct wiimote_data *wdata, const __u8 *ext)
  {
  	__s16 rx, ry, lx, ly;
  
  	/*   Byte |  8  |  7  |  6  |  5  |  4  |  3  |  2  |  1  |
  	 *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
  	 *    1   |                   LX <7:0>                    |
  	 *   -----+-----------------------+-----------------------+
  	 *    2   |  0     0     0     0  |       LX <11:8>       |
  	 *   -----+-----------------------+-----------------------+
  	 *    3   |                   RX <7:0>                    |
  	 *   -----+-----------------------+-----------------------+
  	 *    4   |  0     0     0     0  |       RX <11:8>       |
  	 *   -----+-----------------------+-----------------------+
  	 *    5   |                   LY <7:0>                    |
  	 *   -----+-----------------------+-----------------------+
  	 *    6   |  0     0     0     0  |       LY <11:8>       |
  	 *   -----+-----------------------+-----------------------+
  	 *    7   |                   RY <7:0>                    |
  	 *   -----+-----------------------+-----------------------+
  	 *    8   |  0     0     0     0  |       RY <11:8>       |
  	 *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
  	 *    9   | BDR | BDD | BLT | B-  | BH  | B+  | BRT |  1  |
  	 *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
  	 *   10   | BZL | BB  | BY  | BA  | BX  | BZR | BDL | BDU |
  	 *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
  	 *   11   |  1  |     BATTERY     | USB |CHARG|LTHUM|RTHUM|
  	 *   -----+-----+-----------------+-----------+-----+-----+
  	 * All buttons are low-active (0 if pressed)
  	 * RX and RY are right analog stick
  	 * LX and LY are left analog stick
  	 * BLT is left trigger, BRT is right trigger.
  	 * BDR, BDD, BDL, BDU form the D-Pad with right, down, left, up buttons
  	 * BZL is left Z button and BZR is right Z button
  	 * B-, BH, B+ are +, HOME and - buttons
  	 * BB, BY, BA, BX are A, B, X, Y buttons
  	 *
  	 * Bits marked as 0/1 are unknown and never changed during tests.
  	 *
  	 * Not entirely verified:
  	 *   CHARG: 1 if uncharging, 0 if charging
  	 *   USB: 1 if not connected, 0 if connected
  	 *   BATTERY: battery capacity from 000 (empty) to 100 (full)
  	 */
  
  	lx = (ext[0] & 0xff) | ((ext[1] & 0x0f) << 8);
  	rx = (ext[2] & 0xff) | ((ext[3] & 0x0f) << 8);
  	ly = (ext[4] & 0xff) | ((ext[5] & 0x0f) << 8);
  	ry = (ext[6] & 0xff) | ((ext[7] & 0x0f) << 8);
  
  	/* zero-point offsets */
  	lx -= 0x800;
  	ly = 0x800 - ly;
  	rx -= 0x800;
  	ry = 0x800 - ry;
  
  	/* Trivial automatic calibration. We don't know any calibration data
  	 * in the EEPROM so we must use the first report to calibrate the
  	 * null-position of the analog sticks. Users can retrigger calibration
  	 * via sysfs, or set it explicitly. If data is off more than abs(500),
  	 * we skip calibration as the sticks are likely to be moved already. */
  	if (!(wdata->state.flags & WIIPROTO_FLAG_PRO_CALIB_DONE)) {
  		wdata->state.flags |= WIIPROTO_FLAG_PRO_CALIB_DONE;
  		if (abs(lx) < 500)
  			wdata->state.calib_pro_sticks[0] = -lx;
  		if (abs(ly) < 500)
  			wdata->state.calib_pro_sticks[1] = -ly;
  		if (abs(rx) < 500)
  			wdata->state.calib_pro_sticks[2] = -rx;
  		if (abs(ry) < 500)
  			wdata->state.calib_pro_sticks[3] = -ry;
  	}
  
  	/* apply calibration data */
  	lx += wdata->state.calib_pro_sticks[0];
  	ly += wdata->state.calib_pro_sticks[1];
  	rx += wdata->state.calib_pro_sticks[2];
  	ry += wdata->state.calib_pro_sticks[3];
  
  	input_report_abs(wdata->extension.input, ABS_X, lx);
  	input_report_abs(wdata->extension.input, ABS_Y, ly);
  	input_report_abs(wdata->extension.input, ABS_RX, rx);
  	input_report_abs(wdata->extension.input, ABS_RY, ry);
  
  	input_report_key(wdata->extension.input,
  			 wiimod_pro_map[WIIMOD_PRO_KEY_RIGHT],
  			 !(ext[8] & 0x80));
  	input_report_key(wdata->extension.input,
  			 wiimod_pro_map[WIIMOD_PRO_KEY_DOWN],
  			 !(ext[8] & 0x40));
  	input_report_key(wdata->extension.input,
  			 wiimod_pro_map[WIIMOD_PRO_KEY_TL],
  			 !(ext[8] & 0x20));
  	input_report_key(wdata->extension.input,
  			 wiimod_pro_map[WIIMOD_PRO_KEY_MINUS],
  			 !(ext[8] & 0x10));
  	input_report_key(wdata->extension.input,
  			 wiimod_pro_map[WIIMOD_PRO_KEY_HOME],
  			 !(ext[8] & 0x08));
  	input_report_key(wdata->extension.input,
  			 wiimod_pro_map[WIIMOD_PRO_KEY_PLUS],
  			 !(ext[8] & 0x04));
  	input_report_key(wdata->extension.input,
  			 wiimod_pro_map[WIIMOD_PRO_KEY_TR],
  			 !(ext[8] & 0x02));
  
  	input_report_key(wdata->extension.input,
  			 wiimod_pro_map[WIIMOD_PRO_KEY_ZL],
  			 !(ext[9] & 0x80));
  	input_report_key(wdata->extension.input,
  			 wiimod_pro_map[WIIMOD_PRO_KEY_B],
  			 !(ext[9] & 0x40));
  	input_report_key(wdata->extension.input,
  			 wiimod_pro_map[WIIMOD_PRO_KEY_Y],
  			 !(ext[9] & 0x20));
  	input_report_key(wdata->extension.input,
  			 wiimod_pro_map[WIIMOD_PRO_KEY_A],
  			 !(ext[9] & 0x10));
  	input_report_key(wdata->extension.input,
  			 wiimod_pro_map[WIIMOD_PRO_KEY_X],
  			 !(ext[9] & 0x08));
  	input_report_key(wdata->extension.input,
  			 wiimod_pro_map[WIIMOD_PRO_KEY_ZR],
  			 !(ext[9] & 0x04));
  	input_report_key(wdata->extension.input,
  			 wiimod_pro_map[WIIMOD_PRO_KEY_LEFT],
  			 !(ext[9] & 0x02));
  	input_report_key(wdata->extension.input,
  			 wiimod_pro_map[WIIMOD_PRO_KEY_UP],
  			 !(ext[9] & 0x01));
  
  	input_report_key(wdata->extension.input,
  			 wiimod_pro_map[WIIMOD_PRO_KEY_THUMBL],
  			 !(ext[10] & 0x02));
  	input_report_key(wdata->extension.input,
  			 wiimod_pro_map[WIIMOD_PRO_KEY_THUMBR],
  			 !(ext[10] & 0x01));
  
  	input_sync(wdata->extension.input);
  }
  
  static int wiimod_pro_open(struct input_dev *dev)
  {
  	struct wiimote_data *wdata = input_get_drvdata(dev);
  	unsigned long flags;
  
  	spin_lock_irqsave(&wdata->state.lock, flags);
  	wdata->state.flags |= WIIPROTO_FLAG_EXT_USED;
  	wiiproto_req_drm(wdata, WIIPROTO_REQ_NULL);
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  
  	return 0;
  }
  
  static void wiimod_pro_close(struct input_dev *dev)
  {
  	struct wiimote_data *wdata = input_get_drvdata(dev);
  	unsigned long flags;
  
  	spin_lock_irqsave(&wdata->state.lock, flags);
  	wdata->state.flags &= ~WIIPROTO_FLAG_EXT_USED;
  	wiiproto_req_drm(wdata, WIIPROTO_REQ_NULL);
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  }
  
  static int wiimod_pro_play(struct input_dev *dev, void *data,
  			   struct ff_effect *eff)
  {
  	struct wiimote_data *wdata = input_get_drvdata(dev);
  	__u8 value;
  
  	/*
  	 * The wiimote supports only a single rumble motor so if any magnitude
  	 * is set to non-zero then we start the rumble motor. If both are set to
  	 * zero, we stop the rumble motor.
  	 */
  
  	if (eff->u.rumble.strong_magnitude || eff->u.rumble.weak_magnitude)
  		value = 1;
  	else
  		value = 0;
  
  	/* Locking state.lock here might deadlock with input_event() calls.
  	 * schedule_work acts as barrier. Merging multiple changes is fine. */
  	wdata->state.cache_rumble = value;
  	schedule_work(&wdata->rumble_worker);
  
  	return 0;
  }
  
  static ssize_t wiimod_pro_calib_show(struct device *dev,
  				     struct device_attribute *attr,
  				     char *out)
  {
  	struct wiimote_data *wdata = dev_to_wii(dev);
  	int r;
  
  	r = 0;
  	r += sprintf(&out[r], "%+06hd:", wdata->state.calib_pro_sticks[0]);
  	r += sprintf(&out[r], "%+06hd ", wdata->state.calib_pro_sticks[1]);
  	r += sprintf(&out[r], "%+06hd:", wdata->state.calib_pro_sticks[2]);
  	r += sprintf(&out[r], "%+06hd
  ", wdata->state.calib_pro_sticks[3]);
  
  	return r;
  }
  
  static ssize_t wiimod_pro_calib_store(struct device *dev,
  				      struct device_attribute *attr,
  				      const char *buf, size_t count)
  {
  	struct wiimote_data *wdata = dev_to_wii(dev);
  	int r;
  	s16 x1, y1, x2, y2;
  
  	if (!strncmp(buf, "scan
  ", 5)) {
  		spin_lock_irq(&wdata->state.lock);
  		wdata->state.flags &= ~WIIPROTO_FLAG_PRO_CALIB_DONE;
  		spin_unlock_irq(&wdata->state.lock);
  	} else {
  		r = sscanf(buf, "%hd:%hd %hd:%hd", &x1, &y1, &x2, &y2);
  		if (r != 4)
  			return -EINVAL;
  
  		spin_lock_irq(&wdata->state.lock);
  		wdata->state.flags |= WIIPROTO_FLAG_PRO_CALIB_DONE;
  		spin_unlock_irq(&wdata->state.lock);
  
  		wdata->state.calib_pro_sticks[0] = x1;
  		wdata->state.calib_pro_sticks[1] = y1;
  		wdata->state.calib_pro_sticks[2] = x2;
  		wdata->state.calib_pro_sticks[3] = y2;
  	}
  
  	return strnlen(buf, PAGE_SIZE);
  }
  
  static DEVICE_ATTR(pro_calib, S_IRUGO|S_IWUSR|S_IWGRP, wiimod_pro_calib_show,
  		   wiimod_pro_calib_store);
  
  static int wiimod_pro_probe(const struct wiimod_ops *ops,
  			    struct wiimote_data *wdata)
  {
  	int ret, i;
  	unsigned long flags;
  
  	INIT_WORK(&wdata->rumble_worker, wiimod_rumble_worker);
  	wdata->state.calib_pro_sticks[0] = 0;
  	wdata->state.calib_pro_sticks[1] = 0;
  	wdata->state.calib_pro_sticks[2] = 0;
  	wdata->state.calib_pro_sticks[3] = 0;
  
  	spin_lock_irqsave(&wdata->state.lock, flags);
  	wdata->state.flags &= ~WIIPROTO_FLAG_PRO_CALIB_DONE;
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  
  	wdata->extension.input = input_allocate_device();
  	if (!wdata->extension.input)
  		return -ENOMEM;
  
  	set_bit(FF_RUMBLE, wdata->extension.input->ffbit);
  	input_set_drvdata(wdata->extension.input, wdata);
  
  	if (input_ff_create_memless(wdata->extension.input, NULL,
  				    wiimod_pro_play)) {
  		ret = -ENOMEM;
  		goto err_free;
  	}
  
  	ret = device_create_file(&wdata->hdev->dev,
  				 &dev_attr_pro_calib);
  	if (ret) {
  		hid_err(wdata->hdev, "cannot create sysfs attribute
  ");
  		goto err_free;
  	}
  
  	wdata->extension.input->open = wiimod_pro_open;
  	wdata->extension.input->close = wiimod_pro_close;
  	wdata->extension.input->dev.parent = &wdata->hdev->dev;
  	wdata->extension.input->id.bustype = wdata->hdev->bus;
  	wdata->extension.input->id.vendor = wdata->hdev->vendor;
  	wdata->extension.input->id.product = wdata->hdev->product;
  	wdata->extension.input->id.version = wdata->hdev->version;
  	wdata->extension.input->name = WIIMOTE_NAME " Pro Controller";
  
  	set_bit(EV_KEY, wdata->extension.input->evbit);
  	for (i = 0; i < WIIMOD_PRO_KEY_NUM; ++i)
  		set_bit(wiimod_pro_map[i],
  			wdata->extension.input->keybit);
  
  	set_bit(EV_ABS, wdata->extension.input->evbit);
  	set_bit(ABS_X, wdata->extension.input->absbit);
  	set_bit(ABS_Y, wdata->extension.input->absbit);
  	set_bit(ABS_RX, wdata->extension.input->absbit);
  	set_bit(ABS_RY, wdata->extension.input->absbit);
  	input_set_abs_params(wdata->extension.input,
  			     ABS_X, -0x400, 0x400, 4, 100);
  	input_set_abs_params(wdata->extension.input,
  			     ABS_Y, -0x400, 0x400, 4, 100);
  	input_set_abs_params(wdata->extension.input,
  			     ABS_RX, -0x400, 0x400, 4, 100);
  	input_set_abs_params(wdata->extension.input,
  			     ABS_RY, -0x400, 0x400, 4, 100);
  
  	ret = input_register_device(wdata->extension.input);
  	if (ret)
  		goto err_file;
  
  	return 0;
  
  err_file:
  	device_remove_file(&wdata->hdev->dev,
  			   &dev_attr_pro_calib);
  err_free:
  	input_free_device(wdata->extension.input);
  	wdata->extension.input = NULL;
  	return ret;
  }
  
  static void wiimod_pro_remove(const struct wiimod_ops *ops,
  			      struct wiimote_data *wdata)
  {
  	unsigned long flags;
  
  	if (!wdata->extension.input)
  		return;
  
  	input_unregister_device(wdata->extension.input);
  	wdata->extension.input = NULL;
  	cancel_work_sync(&wdata->rumble_worker);
  	device_remove_file(&wdata->hdev->dev,
  			   &dev_attr_pro_calib);
  
  	spin_lock_irqsave(&wdata->state.lock, flags);
  	wiiproto_req_rumble(wdata, 0);
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  }
  
  static const struct wiimod_ops wiimod_pro = {
  	.flags = WIIMOD_FLAG_EXT16,
  	.arg = 0,
  	.probe = wiimod_pro_probe,
  	.remove = wiimod_pro_remove,
  	.in_ext = wiimod_pro_in_ext,
  };
  
  /*
   * Builtin Motion Plus
   * This module simply sets the WIIPROTO_FLAG_BUILTIN_MP protocol flag which
   * disables polling for Motion-Plus. This should be set only for devices which
   * don't allow MP hotplugging.
   */
  
  static int wiimod_builtin_mp_probe(const struct wiimod_ops *ops,
  				   struct wiimote_data *wdata)
  {
  	unsigned long flags;
  
  	spin_lock_irqsave(&wdata->state.lock, flags);
  	wdata->state.flags |= WIIPROTO_FLAG_BUILTIN_MP;
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  
  	return 0;
  }
  
  static void wiimod_builtin_mp_remove(const struct wiimod_ops *ops,
  				     struct wiimote_data *wdata)
  {
  	unsigned long flags;
  
  	spin_lock_irqsave(&wdata->state.lock, flags);
  	wdata->state.flags |= WIIPROTO_FLAG_BUILTIN_MP;
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  }
  
  static const struct wiimod_ops wiimod_builtin_mp = {
  	.flags = 0,
  	.arg = 0,
  	.probe = wiimod_builtin_mp_probe,
  	.remove = wiimod_builtin_mp_remove,
  };
  
  /*
   * No Motion Plus
   * This module simply sets the WIIPROTO_FLAG_NO_MP protocol flag which
   * disables motion-plus. This is needed for devices that advertise this but we
   * don't know how to use it (or whether it is actually present).
   */
  
  static int wiimod_no_mp_probe(const struct wiimod_ops *ops,
  			      struct wiimote_data *wdata)
  {
  	unsigned long flags;
  
  	spin_lock_irqsave(&wdata->state.lock, flags);
  	wdata->state.flags |= WIIPROTO_FLAG_NO_MP;
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  
  	return 0;
  }
  
  static void wiimod_no_mp_remove(const struct wiimod_ops *ops,
  				struct wiimote_data *wdata)
  {
  	unsigned long flags;
  
  	spin_lock_irqsave(&wdata->state.lock, flags);
  	wdata->state.flags |= WIIPROTO_FLAG_NO_MP;
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  }
  
  static const struct wiimod_ops wiimod_no_mp = {
  	.flags = 0,
  	.arg = 0,
  	.probe = wiimod_no_mp_probe,
  	.remove = wiimod_no_mp_remove,
  };
  
  /*
   * Motion Plus
   * The Motion Plus extension provides rotation sensors (gyro) as a small
   * extension device for Wii Remotes. Many devices have them built-in so
   * you cannot see them from the outside.
   * Motion Plus extensions are special because they are on a separate extension
   * port and allow other extensions to be used simultaneously. This is all
   * handled by the Wiimote Core so we don't have to deal with it.
   */
  
  static void wiimod_mp_in_mp(struct wiimote_data *wdata, const __u8 *ext)
  {
  	__s32 x, y, z;
  
  	/*        |   8    7    6    5    4    3 |  2  |  1  |
  	 *   -----+------------------------------+-----+-----+
  	 *    1   |               Yaw Speed <7:0>            |
  	 *    2   |              Roll Speed <7:0>            |
  	 *    3   |             Pitch Speed <7:0>            |
  	 *   -----+------------------------------+-----+-----+
  	 *    4   |       Yaw Speed <13:8>       | Yaw |Pitch|
  	 *   -----+------------------------------+-----+-----+
  	 *    5   |      Roll Speed <13:8>       |Roll | Ext |
  	 *   -----+------------------------------+-----+-----+
  	 *    6   |     Pitch Speed <13:8>       |  1  |  0  |
  	 *   -----+------------------------------+-----+-----+
  	 * The single bits Yaw, Roll, Pitch in the lower right corner specify
  	 * whether the wiimote is rotating fast (0) or slow (1). Speed for slow
  	 * roation is 440 deg/s and for fast rotation 2000 deg/s. To get a
  	 * linear scale we multiply by 2000/440 = ~4.5454 which is 18 for fast
  	 * and 9 for slow.
  	 * If the wiimote is not rotating the sensor reports 2^13 = 8192.
  	 * Ext specifies whether an extension is connected to the motionp.
  	 * which is parsed by wiimote-core.
  	 */
  
  	x = ext[0];
  	y = ext[1];
  	z = ext[2];
  
  	x |= (((__u16)ext[3]) << 6) & 0xff00;
  	y |= (((__u16)ext[4]) << 6) & 0xff00;
  	z |= (((__u16)ext[5]) << 6) & 0xff00;
  
  	x -= 8192;
  	y -= 8192;
  	z -= 8192;
  
  	if (!(ext[3] & 0x02))
  		x *= 18;
  	else
  		x *= 9;
  	if (!(ext[4] & 0x02))
  		y *= 18;
  	else
  		y *= 9;
  	if (!(ext[3] & 0x01))
  		z *= 18;
  	else
  		z *= 9;
  
  	input_report_abs(wdata->mp, ABS_RX, x);
  	input_report_abs(wdata->mp, ABS_RY, y);
  	input_report_abs(wdata->mp, ABS_RZ, z);
  	input_sync(wdata->mp);
  }
  
  static int wiimod_mp_open(struct input_dev *dev)
  {
  	struct wiimote_data *wdata = input_get_drvdata(dev);
  	unsigned long flags;
  
  	spin_lock_irqsave(&wdata->state.lock, flags);
  	wdata->state.flags |= WIIPROTO_FLAG_MP_USED;
  	wiiproto_req_drm(wdata, WIIPROTO_REQ_NULL);
  	__wiimote_schedule(wdata);
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  
  	return 0;
  }
  
  static void wiimod_mp_close(struct input_dev *dev)
  {
  	struct wiimote_data *wdata = input_get_drvdata(dev);
  	unsigned long flags;
  
  	spin_lock_irqsave(&wdata->state.lock, flags);
  	wdata->state.flags &= ~WIIPROTO_FLAG_MP_USED;
  	wiiproto_req_drm(wdata, WIIPROTO_REQ_NULL);
  	__wiimote_schedule(wdata);
  	spin_unlock_irqrestore(&wdata->state.lock, flags);
  }
  
  static int wiimod_mp_probe(const struct wiimod_ops *ops,
  			   struct wiimote_data *wdata)
  {
  	int ret;
  
  	wdata->mp = input_allocate_device();
  	if (!wdata->mp)
  		return -ENOMEM;
  
  	input_set_drvdata(wdata->mp, wdata);
  	wdata->mp->open = wiimod_mp_open;
  	wdata->mp->close = wiimod_mp_close;
  	wdata->mp->dev.parent = &wdata->hdev->dev;
  	wdata->mp->id.bustype = wdata->hdev->bus;
  	wdata->mp->id.vendor = wdata->hdev->vendor;
  	wdata->mp->id.product = wdata->hdev->product;
  	wdata->mp->id.version = wdata->hdev->version;
  	wdata->mp->name = WIIMOTE_NAME " Motion Plus";
  
  	set_bit(EV_ABS, wdata->mp->evbit);
  	set_bit(ABS_RX, wdata->mp->absbit);
  	set_bit(ABS_RY, wdata->mp->absbit);
  	set_bit(ABS_RZ, wdata->mp->absbit);
  	input_set_abs_params(wdata->mp,
  			     ABS_RX, -16000, 16000, 4, 8);
  	input_set_abs_params(wdata->mp,
  			     ABS_RY, -16000, 16000, 4, 8);
  	input_set_abs_params(wdata->mp,
  			     ABS_RZ, -16000, 16000, 4, 8);
  
  	ret = input_register_device(wdata->mp);
  	if (ret)
  		goto err_free;
  
  	return 0;
  
  err_free:
  	input_free_device(wdata->mp);
  	wdata->mp = NULL;
  	return ret;
  }
  
  static void wiimod_mp_remove(const struct wiimod_ops *ops,
  			     struct wiimote_data *wdata)
  {
  	if (!wdata->mp)
  		return;
  
  	input_unregister_device(wdata->mp);
  	wdata->mp = NULL;
  }
  
  const struct wiimod_ops wiimod_mp = {
  	.flags = 0,
  	.arg = 0,
  	.probe = wiimod_mp_probe,
  	.remove = wiimod_mp_remove,
  	.in_mp = wiimod_mp_in_mp,
  };
  
  /* module table */
  
  static const struct wiimod_ops wiimod_dummy;
  
  const struct wiimod_ops *wiimod_table[WIIMOD_NUM] = {
  	[WIIMOD_KEYS] = &wiimod_keys,
  	[WIIMOD_RUMBLE] = &wiimod_rumble,
  	[WIIMOD_BATTERY] = &wiimod_battery,
  	[WIIMOD_LED1] = &wiimod_leds[0],
  	[WIIMOD_LED2] = &wiimod_leds[1],
  	[WIIMOD_LED3] = &wiimod_leds[2],
  	[WIIMOD_LED4] = &wiimod_leds[3],
  	[WIIMOD_ACCEL] = &wiimod_accel,
  	[WIIMOD_IR] = &wiimod_ir,
  	[WIIMOD_BUILTIN_MP] = &wiimod_builtin_mp,
  	[WIIMOD_NO_MP] = &wiimod_no_mp,
  };
  
  const struct wiimod_ops *wiimod_ext_table[WIIMOTE_EXT_NUM] = {
  	[WIIMOTE_EXT_NONE] = &wiimod_dummy,
  	[WIIMOTE_EXT_UNKNOWN] = &wiimod_dummy,
  	[WIIMOTE_EXT_NUNCHUK] = &wiimod_nunchuk,
  	[WIIMOTE_EXT_CLASSIC_CONTROLLER] = &wiimod_classic,
  	[WIIMOTE_EXT_BALANCE_BOARD] = &wiimod_bboard,
  	[WIIMOTE_EXT_PRO_CONTROLLER] = &wiimod_pro,
  };