drivers/input/joystick/iforce/iforce-main.c - kernel/msm - Gitiles

 /*
  * $Id: iforce-main.c,v 1.19 2002/07/07 10:22:50 jdeneux Exp $
  *
  *  Copyright (c) 2000-2002 Vojtech Pavlik <vojtech@ucw.cz>
  *  Copyright (c) 2001-2002 Johann Deneux <deneux@ifrance.com>
  *
  *  USB/RS232 I-Force joysticks and wheels.
  */

 /*
  * 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.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  *
  * Should you need to contact me, the author, you can do so either by
  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  */

 #include "iforce.h"

 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>, Johann Deneux <deneux@ifrance.com>");
 MODULE_DESCRIPTION("USB/RS232 I-Force joysticks and wheels driver");
 MODULE_LICENSE("GPL");

 static signed short btn_joystick[] =
 { BTN_TRIGGER, BTN_TOP, BTN_THUMB, BTN_TOP2, BTN_BASE,
   BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_BASE5, BTN_A, BTN_B, BTN_C, -1 };

 static signed short btn_avb_pegasus[] =
 { BTN_TRIGGER, BTN_TOP, BTN_THUMB, BTN_TOP2, BTN_BASE,
   BTN_BASE2, BTN_BASE3, BTN_BASE4, -1 };

 static signed short btn_wheel[] =
 { BTN_TRIGGER, BTN_TOP, BTN_THUMB, BTN_TOP2, BTN_BASE,
   BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_BASE5, BTN_A, BTN_B, BTN_C, -1 };

 static signed short btn_avb_tw[] =
 { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE,
   BTN_BASE2, BTN_BASE3, BTN_BASE4, -1 };

 static signed short btn_avb_wheel[] =
 { BTN_GEAR_DOWN, BTN_GEAR_UP, BTN_BASE, BTN_BASE2, BTN_BASE3,
   BTN_BASE4, BTN_BASE5, BTN_BASE6, -1 };

 static signed short abs_joystick[] =
 { ABS_X, ABS_Y, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, -1 };

 static signed short abs_avb_pegasus[] =
 { ABS_X, ABS_Y, ABS_THROTTLE, ABS_RUDDER, ABS_HAT0X, ABS_HAT0Y,
   ABS_HAT1X, ABS_HAT1Y, -1 };

 static signed short abs_wheel[] =
 { ABS_WHEEL, ABS_GAS, ABS_BRAKE, ABS_HAT0X, ABS_HAT0Y, -1 };

 static signed short ff_iforce[] =
 { FF_PERIODIC, FF_CONSTANT, FF_SPRING, FF_DAMPER,
   FF_SQUARE, FF_TRIANGLE, FF_SINE, FF_SAW_UP, FF_SAW_DOWN, FF_GAIN,
   FF_AUTOCENTER, -1 };

 static struct iforce_device iforce_device[] = {
 	{ 0x044f, 0xa01c, "Thrustmaster Motor Sport GT",		btn_wheel, abs_wheel, ff_iforce },
 	{ 0x046d, 0xc281, "Logitech WingMan Force",			btn_joystick, abs_joystick, ff_iforce },
 	{ 0x046d, 0xc291, "Logitech WingMan Formula Force",		btn_wheel, abs_wheel, ff_iforce },
 	{ 0x05ef, 0x020a, "AVB Top Shot Pegasus",			btn_avb_pegasus, abs_avb_pegasus, ff_iforce },
 	{ 0x05ef, 0x8884, "AVB Mag Turbo Force",			btn_avb_wheel, abs_wheel, ff_iforce },
 	{ 0x05ef, 0x8888, "AVB Top Shot Force Feedback Racing Wheel",	btn_avb_tw, abs_wheel, ff_iforce }, //?
 	{ 0x061c, 0xc0a4, "ACT LABS Force RS",                          btn_wheel, abs_wheel, ff_iforce }, //?
 	{ 0x06f8, 0x0001, "Guillemot Race Leader Force Feedback",	btn_wheel, abs_wheel, ff_iforce }, //?
 	{ 0x06f8, 0x0004, "Guillemot Force Feedback Racing Wheel",	btn_wheel, abs_wheel, ff_iforce }, //?
 	{ 0x06f8, 0x0004, "Gullemot Jet Leader 3D",			btn_joystick, abs_joystick, ff_iforce }, //?
 	{ 0x06d6, 0x29bc, "Trust Force Feedback Race Master",		btn_wheel, abs_wheel, ff_iforce },
 	{ 0x0000, 0x0000, "Unknown I-Force Device [%04x:%04x]",		btn_joystick, abs_joystick, ff_iforce }
 };

 static int iforce_playback(struct input_dev *dev, int effect_id, int value)
 {
 	struct iforce* iforce = dev->private;
 	struct iforce_core_effect *core_effect = &iforce->core_effects[effect_id];

 	if (value > 0)
 		set_bit(FF_CORE_SHOULD_PLAY, core_effect->flags);
 	else
 		clear_bit(FF_CORE_SHOULD_PLAY, core_effect->flags);

 	iforce_control_playback(iforce, effect_id, value);
 	return 0;
 }

 static void iforce_set_gain(struct input_dev *dev, u16 gain)
 {
 	struct iforce* iforce = dev->private;
 	unsigned char data[3];

 	data[0] = gain >> 9;
 	iforce_send_packet(iforce, FF_CMD_GAIN, data);
 }

 static void iforce_set_autocenter(struct input_dev *dev, u16 magnitude)
 {
 	struct iforce* iforce = dev->private;
 	unsigned char data[3];

 	data[0] = 0x03;
 	data[1] = magnitude >> 9;
 	iforce_send_packet(iforce, FF_CMD_AUTOCENTER, data);

 	data[0] = 0x04;
 	data[1] = 0x01;
 	iforce_send_packet(iforce, FF_CMD_AUTOCENTER, data);
 }

 /*
  * Function called when an ioctl is performed on the event dev entry.
  * It uploads an effect to the device
  */
 static int iforce_upload_effect(struct input_dev *dev, struct ff_effect *effect, struct ff_effect *old)
 {
 	struct iforce* iforce = dev->private;
 	struct iforce_core_effect *core_effect = &iforce->core_effects[effect->id];
 	int ret;

 	if (__test_and_set_bit(FF_CORE_IS_USED, core_effect->flags)) {
 		/* Check the effect is not already being updated */
 		if (test_bit(FF_CORE_UPDATE, core_effect->flags))
 			return -EAGAIN;
 	}

 /*
  * Upload the effect
  */
 	switch (effect->type) {

 		case FF_PERIODIC:
 			ret = iforce_upload_periodic(iforce, effect, old);
 			break;

 		case FF_CONSTANT:
 			ret = iforce_upload_constant(iforce, effect, old);
 			break;

 		case FF_SPRING:
 		case FF_DAMPER:
 			ret = iforce_upload_condition(iforce, effect, old);
 			break;

 		default:
 			return -EINVAL;
 	}

 	if (ret == 0) {
 		/* A packet was sent, forbid new updates until we are notified
 		 * that the packet was updated
 		 */
 		set_bit(FF_CORE_UPDATE, core_effect->flags);
 	}
 	return ret;
 }

 /*
  * Erases an effect: it frees the effect id and mark as unused the memory
  * allocated for the parameters
  */
 static int iforce_erase_effect(struct input_dev *dev, int effect_id)
 {
 	struct iforce *iforce = dev->private;
 	struct iforce_core_effect *core_effect = &iforce->core_effects[effect_id];
 	int err = 0;

 	if (test_bit(FF_MOD1_IS_USED, core_effect->flags))
 		err = release_resource(&core_effect->mod1_chunk);

 	if (!err && test_bit(FF_MOD2_IS_USED, core_effect->flags))
 		err = release_resource(&core_effect->mod2_chunk);

 	/* TODO: remember to change that if more FF_MOD* bits are added */
 	core_effect->flags[0] = 0;

 	return err;
 }

 static int iforce_open(struct input_dev *dev)
 {
 	struct iforce *iforce = dev->private;

 	switch (iforce->bus) {
 #ifdef CONFIG_JOYSTICK_IFORCE_USB
 		case IFORCE_USB:
 			iforce->irq->dev = iforce->usbdev;
 			if (usb_submit_urb(iforce->irq, GFP_KERNEL))
 				return -EIO;
 			break;
 #endif
 	}

 	if (test_bit(EV_FF, dev->evbit)) {
 		/* Enable force feedback */
 		iforce_send_packet(iforce, FF_CMD_ENABLE, "\004");
 	}

 	return 0;
 }

 static void iforce_release(struct input_dev *dev)
 {
 	struct iforce *iforce = dev->private;
 	int i;

 	if (test_bit(EV_FF, dev->evbit)) {
 		/* Check: no effects should be present in memory */
 		for (i = 0; i < dev->ff->max_effects; i++) {
 			if (test_bit(FF_CORE_IS_USED, iforce->core_effects[i].flags)) {
 				printk(KERN_WARNING "iforce_release: Device still owns effects\n");
 				break;
 			}
 		}

 		/* Disable force feedback playback */
 		iforce_send_packet(iforce, FF_CMD_ENABLE, "\001");
 	}

 	switch (iforce->bus) {
 #ifdef CONFIG_JOYSTICK_IFORCE_USB
 		case IFORCE_USB:
 			usb_unlink_urb(iforce->irq);

 			/* The device was unplugged before the file
 			 * was released */
 			if (iforce->usbdev == NULL) {
 				iforce_delete_device(iforce);
 				kfree(iforce);
 			}
 		break;
 #endif
 	}
 }

 void iforce_delete_device(struct iforce *iforce)
 {
 	switch (iforce->bus) {
 #ifdef CONFIG_JOYSTICK_IFORCE_USB
 	case IFORCE_USB:
 		iforce_usb_delete(iforce);
 		break;
 #endif
 #ifdef CONFIG_JOYSTICK_IFORCE_232
 	case IFORCE_232:
 		//TODO: Wait for the last packets to be sent
 		break;
 #endif
 	}
 }

 int iforce_init_device(struct iforce *iforce)
 {
 	struct input_dev *input_dev;
 	struct ff_device *ff;
 	unsigned char c[] = "CEOV";
 	int i, error;
 	int ff_effects = 0;

 	input_dev = input_allocate_device();
 	if (!input_dev)
 		return -ENOMEM;

 	init_waitqueue_head(&iforce->wait);
 	spin_lock_init(&iforce->xmit_lock);
 	mutex_init(&iforce->mem_mutex);
 	iforce->xmit.buf = iforce->xmit_data;
 	iforce->dev = input_dev;

 /*
  * Input device fields.
  */

 	switch (iforce->bus) {
 #ifdef CONFIG_JOYSTICK_IFORCE_USB
 	case IFORCE_USB:
 		input_dev->id.bustype = BUS_USB;
 		input_dev->cdev.dev = &iforce->usbdev->dev;
 		break;
 #endif
 #ifdef CONFIG_JOYSTICK_IFORCE_232
 	case IFORCE_232:
 		input_dev->id.bustype = BUS_RS232;
 		input_dev->cdev.dev = &iforce->serio->dev;
 		break;
 #endif
 	}

 	input_dev->private = iforce;
 	input_dev->name = "Unknown I-Force device";
 	input_dev->open = iforce_open;
 	input_dev->close = iforce_release;

 /*
  * On-device memory allocation.
  */

 	iforce->device_memory.name = "I-Force device effect memory";
 	iforce->device_memory.start = 0;
 	iforce->device_memory.end = 200;
 	iforce->device_memory.flags = IORESOURCE_MEM;
 	iforce->device_memory.parent = NULL;
 	iforce->device_memory.child = NULL;
 	iforce->device_memory.sibling = NULL;

 /*
  * Wait until device ready - until it sends its first response.
  */

 	for (i = 0; i < 20; i++)
 		if (!iforce_get_id_packet(iforce, "O"))
 			break;

 	if (i == 20) { /* 5 seconds */
 		printk(KERN_ERR "iforce-main.c: Timeout waiting for response from device.\n");
 		error = -ENODEV;
 		goto fail;
 	}

 /*
  * Get device info.
  */

 	if (!iforce_get_id_packet(iforce, "M"))
 		input_dev->id.vendor = (iforce->edata[2] << 8) | iforce->edata[1];
 	else
 		printk(KERN_WARNING "iforce-main.c: Device does not respond to id packet M\n");

 	if (!iforce_get_id_packet(iforce, "P"))
 		input_dev->id.product = (iforce->edata[2] << 8) | iforce->edata[1];
 	else
 		printk(KERN_WARNING "iforce-main.c: Device does not respond to id packet P\n");

 	if (!iforce_get_id_packet(iforce, "B"))
 		iforce->device_memory.end = (iforce->edata[2] << 8) | iforce->edata[1];
 	else
 		printk(KERN_WARNING "iforce-main.c: Device does not respond to id packet B\n");

 	if (!iforce_get_id_packet(iforce, "N"))
 		ff_effects = iforce->edata[1];
 	else
 		printk(KERN_WARNING "iforce-main.c: Device does not respond to id packet N\n");

 	/* Check if the device can store more effects than the driver can really handle */
 	if (ff_effects > IFORCE_EFFECTS_MAX) {
 		printk(KERN_WARNING "iforce: Limiting number of effects to %d (device reports %d)\n",
 		       IFORCE_EFFECTS_MAX, ff_effects);
 		ff_effects = IFORCE_EFFECTS_MAX;
 	}

 /*
  * Display additional info.
  */

 	for (i = 0; c[i]; i++)
 		if (!iforce_get_id_packet(iforce, c + i))
 			iforce_dump_packet("info", iforce->ecmd, iforce->edata);

 /*
  * Disable spring, enable force feedback.
  * FIXME: We should use iforce_set_autocenter() et al here.
  */

 	iforce_send_packet(iforce, FF_CMD_AUTOCENTER, "\004\000");

 /*
  * Find appropriate device entry
  */

 	for (i = 0; iforce_device[i].idvendor; i++)
 		if (iforce_device[i].idvendor == input_dev->id.vendor &&
 		    iforce_device[i].idproduct == input_dev->id.product)
 			break;

 	iforce->type = iforce_device + i;
 	input_dev->name = iforce->type->name;

 /*
  * Set input device bitfields and ranges.
  */

 	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS) | BIT(EV_FF_STATUS);

 	for (i = 0; iforce->type->btn[i] >= 0; i++)
 		set_bit(iforce->type->btn[i], input_dev->keybit);
 	set_bit(BTN_DEAD, input_dev->keybit);

 	for (i = 0; iforce->type->abs[i] >= 0; i++) {

 		signed short t = iforce->type->abs[i];

 		switch (t) {

 			case ABS_X:
 			case ABS_Y:
 			case ABS_WHEEL:

 				input_set_abs_params(input_dev, t, -1920, 1920, 16, 128);
 				set_bit(t, input_dev->ffbit);
 				break;

 			case ABS_THROTTLE:
 			case ABS_GAS:
 			case ABS_BRAKE:

 				input_set_abs_params(input_dev, t, 0, 255, 0, 0);
 				break;

 			case ABS_RUDDER:

 				input_set_abs_params(input_dev, t, -128, 127, 0, 0);
 				break;

 			case ABS_HAT0X:
 			case ABS_HAT0Y:
 		        case ABS_HAT1X:
 		        case ABS_HAT1Y:

 				input_set_abs_params(input_dev, t, -1, 1, 0, 0);
 				break;
 		}
 	}

 	if (ff_effects) {

 		for (i = 0; iforce->type->ff[i] >= 0; i++)
 			set_bit(iforce->type->ff[i], input_dev->ffbit);

 		error = input_ff_create(input_dev, ff_effects);
 		if (error)
 			goto fail;

 		ff = input_dev->ff;
 		ff->upload = iforce_upload_effect;
 		ff->erase = iforce_erase_effect;
 		ff->set_gain = iforce_set_gain;
 		ff->set_autocenter = iforce_set_autocenter;
 		ff->playback = iforce_playback;
 	}
 /*
  * Register input device.
  */

 	error = input_register_device(iforce->dev);
 	if (error)
 		goto fail;

 	printk(KERN_DEBUG "iforce->dev->open = %p\n", iforce->dev->open);

 	return 0;

  fail:	input_free_device(input_dev);
 	return error;
 }

 static int __init iforce_init(void)
 {
 #ifdef CONFIG_JOYSTICK_IFORCE_USB
 	usb_register(&iforce_usb_driver);
 #endif
 #ifdef CONFIG_JOYSTICK_IFORCE_232
 	serio_register_driver(&iforce_serio_drv);
 #endif
 	return 0;
 }

 static void __exit iforce_exit(void)
 {
 #ifdef CONFIG_JOYSTICK_IFORCE_USB
 	usb_deregister(&iforce_usb_driver);
 #endif
 #ifdef CONFIG_JOYSTICK_IFORCE_232
 	serio_unregister_driver(&iforce_serio_drv);
 #endif
 }

 module_init(iforce_init);
 module_exit(iforce_exit);
	/*
	* $Id: iforce-main.c,v 1.19 2002/07/07 10:22:50 jdeneux Exp $
	*
	* Copyright (c) 2000-2002 Vojtech Pavlik <vojtech@ucw.cz>
	* Copyright (c) 2001-2002 Johann Deneux <deneux@ifrance.com>
	*
	* USB/RS232 I-Force joysticks and wheels.
	*/

	/*
	* 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.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*
	* Should you need to contact me, the author, you can do so either by
	* e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
	* Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
	*/

	#include "iforce.h"

	MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>, Johann Deneux <deneux@ifrance.com>");
	MODULE_DESCRIPTION("USB/RS232 I-Force joysticks and wheels driver");
	MODULE_LICENSE("GPL");

	static signed short btn_joystick[] =
	{ BTN_TRIGGER, BTN_TOP, BTN_THUMB, BTN_TOP2, BTN_BASE,
	BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_BASE5, BTN_A, BTN_B, BTN_C, -1 };

	static signed short btn_avb_pegasus[] =
	{ BTN_TRIGGER, BTN_TOP, BTN_THUMB, BTN_TOP2, BTN_BASE,
	BTN_BASE2, BTN_BASE3, BTN_BASE4, -1 };

	static signed short btn_wheel[] =
	{ BTN_TRIGGER, BTN_TOP, BTN_THUMB, BTN_TOP2, BTN_BASE,
	BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_BASE5, BTN_A, BTN_B, BTN_C, -1 };

	static signed short btn_avb_tw[] =
	{ BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE,
	BTN_BASE2, BTN_BASE3, BTN_BASE4, -1 };

	static signed short btn_avb_wheel[] =
	{ BTN_GEAR_DOWN, BTN_GEAR_UP, BTN_BASE, BTN_BASE2, BTN_BASE3,
	BTN_BASE4, BTN_BASE5, BTN_BASE6, -1 };

	static signed short abs_joystick[] =
	{ ABS_X, ABS_Y, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, -1 };

	static signed short abs_avb_pegasus[] =
	{ ABS_X, ABS_Y, ABS_THROTTLE, ABS_RUDDER, ABS_HAT0X, ABS_HAT0Y,
	ABS_HAT1X, ABS_HAT1Y, -1 };

	static signed short abs_wheel[] =
	{ ABS_WHEEL, ABS_GAS, ABS_BRAKE, ABS_HAT0X, ABS_HAT0Y, -1 };

	static signed short ff_iforce[] =
	{ FF_PERIODIC, FF_CONSTANT, FF_SPRING, FF_DAMPER,
	FF_SQUARE, FF_TRIANGLE, FF_SINE, FF_SAW_UP, FF_SAW_DOWN, FF_GAIN,
	FF_AUTOCENTER, -1 };

	static struct iforce_device iforce_device[] = {
	{ 0x044f, 0xa01c, "Thrustmaster Motor Sport GT", btn_wheel, abs_wheel, ff_iforce },
	{ 0x046d, 0xc281, "Logitech WingMan Force", btn_joystick, abs_joystick, ff_iforce },
	{ 0x046d, 0xc291, "Logitech WingMan Formula Force", btn_wheel, abs_wheel, ff_iforce },
	{ 0x05ef, 0x020a, "AVB Top Shot Pegasus", btn_avb_pegasus, abs_avb_pegasus, ff_iforce },
	{ 0x05ef, 0x8884, "AVB Mag Turbo Force", btn_avb_wheel, abs_wheel, ff_iforce },
	{ 0x05ef, 0x8888, "AVB Top Shot Force Feedback Racing Wheel", btn_avb_tw, abs_wheel, ff_iforce }, //?
	{ 0x061c, 0xc0a4, "ACT LABS Force RS", btn_wheel, abs_wheel, ff_iforce }, //?
	{ 0x06f8, 0x0001, "Guillemot Race Leader Force Feedback", btn_wheel, abs_wheel, ff_iforce }, //?
	{ 0x06f8, 0x0004, "Guillemot Force Feedback Racing Wheel", btn_wheel, abs_wheel, ff_iforce }, //?
	{ 0x06f8, 0x0004, "Gullemot Jet Leader 3D", btn_joystick, abs_joystick, ff_iforce }, //?
	{ 0x06d6, 0x29bc, "Trust Force Feedback Race Master", btn_wheel, abs_wheel, ff_iforce },
	{ 0x0000, 0x0000, "Unknown I-Force Device [%04x:%04x]", btn_joystick, abs_joystick, ff_iforce }
	};

	static int iforce_playback(struct input_dev *dev, int effect_id, int value)
	{
	struct iforce* iforce = dev->private;
	struct iforce_core_effect *core_effect = &iforce->core_effects[effect_id];

	if (value > 0)
	set_bit(FF_CORE_SHOULD_PLAY, core_effect->flags);
	else
	clear_bit(FF_CORE_SHOULD_PLAY, core_effect->flags);

	iforce_control_playback(iforce, effect_id, value);
	return 0;
	}

	static void iforce_set_gain(struct input_dev *dev, u16 gain)
	{
	struct iforce* iforce = dev->private;
	unsigned char data[3];

	data[0] = gain >> 9;
	iforce_send_packet(iforce, FF_CMD_GAIN, data);
	}

	static void iforce_set_autocenter(struct input_dev *dev, u16 magnitude)
	{
	struct iforce* iforce = dev->private;
	unsigned char data[3];

	data[0] = 0x03;
	data[1] = magnitude >> 9;
	iforce_send_packet(iforce, FF_CMD_AUTOCENTER, data);

	data[0] = 0x04;
	data[1] = 0x01;
	iforce_send_packet(iforce, FF_CMD_AUTOCENTER, data);
	}

	/*
	* Function called when an ioctl is performed on the event dev entry.
	* It uploads an effect to the device
	*/
	static int iforce_upload_effect(struct input_dev dev, struct ff_effect effect, struct ff_effect *old)
	{
	struct iforce* iforce = dev->private;
	struct iforce_core_effect *core_effect = &iforce->core_effects[effect->id];
	int ret;

	if (__test_and_set_bit(FF_CORE_IS_USED, core_effect->flags)) {
	/* Check the effect is not already being updated */
	if (test_bit(FF_CORE_UPDATE, core_effect->flags))
	return -EAGAIN;
	}

	/*
	* Upload the effect
	*/
	switch (effect->type) {

	case FF_PERIODIC:
	ret = iforce_upload_periodic(iforce, effect, old);
	break;

	case FF_CONSTANT:
	ret = iforce_upload_constant(iforce, effect, old);
	break;

	case FF_SPRING:
	case FF_DAMPER:
	ret = iforce_upload_condition(iforce, effect, old);
	break;

	default:
	return -EINVAL;
	}

	if (ret == 0) {
	/* A packet was sent, forbid new updates until we are notified
	* that the packet was updated
	*/
	set_bit(FF_CORE_UPDATE, core_effect->flags);
	}
	return ret;
	}

	/*
	* Erases an effect: it frees the effect id and mark as unused the memory
	* allocated for the parameters
	*/
	static int iforce_erase_effect(struct input_dev *dev, int effect_id)
	{
	struct iforce *iforce = dev->private;
	struct iforce_core_effect *core_effect = &iforce->core_effects[effect_id];
	int err = 0;

	if (test_bit(FF_MOD1_IS_USED, core_effect->flags))
	err = release_resource(&core_effect->mod1_chunk);

	if (!err && test_bit(FF_MOD2_IS_USED, core_effect->flags))
	err = release_resource(&core_effect->mod2_chunk);

	/* TODO: remember to change that if more FF_MOD* bits are added */
	core_effect->flags[0] = 0;

	return err;
	}

	static int iforce_open(struct input_dev *dev)
	{
	struct iforce *iforce = dev->private;

	switch (iforce->bus) {
	#ifdef CONFIG_JOYSTICK_IFORCE_USB
	case IFORCE_USB:
	iforce->irq->dev = iforce->usbdev;
	if (usb_submit_urb(iforce->irq, GFP_KERNEL))
	return -EIO;
	break;
	#endif
	}

	if (test_bit(EV_FF, dev->evbit)) {
	/* Enable force feedback */
	iforce_send_packet(iforce, FF_CMD_ENABLE, "\004");
	}

	return 0;
	}

	static void iforce_release(struct input_dev *dev)
	{
	struct iforce *iforce = dev->private;
	int i;

	if (test_bit(EV_FF, dev->evbit)) {
	/* Check: no effects should be present in memory */
	for (i = 0; i < dev->ff->max_effects; i++) {
	if (test_bit(FF_CORE_IS_USED, iforce->core_effects[i].flags)) {
	printk(KERN_WARNING "iforce_release: Device still owns effects\n");
	break;
	}
	}

	/* Disable force feedback playback */
	iforce_send_packet(iforce, FF_CMD_ENABLE, "\001");
	}

	switch (iforce->bus) {
	#ifdef CONFIG_JOYSTICK_IFORCE_USB
	case IFORCE_USB:
	usb_unlink_urb(iforce->irq);

	/* The device was unplugged before the file
	* was released */
	if (iforce->usbdev == NULL) {
	iforce_delete_device(iforce);
	kfree(iforce);
	}
	break;
	#endif
	}
	}

	void iforce_delete_device(struct iforce *iforce)
	{
	switch (iforce->bus) {
	#ifdef CONFIG_JOYSTICK_IFORCE_USB
	case IFORCE_USB:
	iforce_usb_delete(iforce);
	break;
	#endif
	#ifdef CONFIG_JOYSTICK_IFORCE_232
	case IFORCE_232:
	//TODO: Wait for the last packets to be sent
	break;
	#endif
	}
	}

	int iforce_init_device(struct iforce *iforce)
	{
	struct input_dev *input_dev;
	struct ff_device *ff;
	unsigned char c[] = "CEOV";
	int i, error;
	int ff_effects = 0;

	input_dev = input_allocate_device();
	if (!input_dev)
	return -ENOMEM;

	init_waitqueue_head(&iforce->wait);
	spin_lock_init(&iforce->xmit_lock);
	mutex_init(&iforce->mem_mutex);
	iforce->xmit.buf = iforce->xmit_data;
	iforce->dev = input_dev;

	/*
	* Input device fields.
	*/

	switch (iforce->bus) {
	#ifdef CONFIG_JOYSTICK_IFORCE_USB
	case IFORCE_USB:
	input_dev->id.bustype = BUS_USB;
	input_dev->cdev.dev = &iforce->usbdev->dev;
	break;
	#endif
	#ifdef CONFIG_JOYSTICK_IFORCE_232
	case IFORCE_232:
	input_dev->id.bustype = BUS_RS232;
	input_dev->cdev.dev = &iforce->serio->dev;
	break;
	#endif
	}

	input_dev->private = iforce;
	input_dev->name = "Unknown I-Force device";
	input_dev->open = iforce_open;
	input_dev->close = iforce_release;

	/*
	* On-device memory allocation.
	*/

	iforce->device_memory.name = "I-Force device effect memory";
	iforce->device_memory.start = 0;
	iforce->device_memory.end = 200;
	iforce->device_memory.flags = IORESOURCE_MEM;
	iforce->device_memory.parent = NULL;
	iforce->device_memory.child = NULL;
	iforce->device_memory.sibling = NULL;

	/*
	* Wait until device ready - until it sends its first response.
	*/

	for (i = 0; i < 20; i++)
	if (!iforce_get_id_packet(iforce, "O"))
	break;

	if (i == 20) { /* 5 seconds */
	printk(KERN_ERR "iforce-main.c: Timeout waiting for response from device.\n");
	error = -ENODEV;
	goto fail;
	}

	/*
	* Get device info.
	*/

	if (!iforce_get_id_packet(iforce, "M"))
	input_dev->id.vendor = (iforce->edata[2] << 8) \| iforce->edata[1];
	else
	printk(KERN_WARNING "iforce-main.c: Device does not respond to id packet M\n");

	if (!iforce_get_id_packet(iforce, "P"))
	input_dev->id.product = (iforce->edata[2] << 8) \| iforce->edata[1];
	else
	printk(KERN_WARNING "iforce-main.c: Device does not respond to id packet P\n");

	if (!iforce_get_id_packet(iforce, "B"))
	iforce->device_memory.end = (iforce->edata[2] << 8) \| iforce->edata[1];
	else
	printk(KERN_WARNING "iforce-main.c: Device does not respond to id packet B\n");

	if (!iforce_get_id_packet(iforce, "N"))
	ff_effects = iforce->edata[1];
	else
	printk(KERN_WARNING "iforce-main.c: Device does not respond to id packet N\n");

	/* Check if the device can store more effects than the driver can really handle */
	if (ff_effects > IFORCE_EFFECTS_MAX) {
	printk(KERN_WARNING "iforce: Limiting number of effects to %d (device reports %d)\n",
	IFORCE_EFFECTS_MAX, ff_effects);
	ff_effects = IFORCE_EFFECTS_MAX;
	}

	/*
	* Display additional info.
	*/

	for (i = 0; c[i]; i++)
	if (!iforce_get_id_packet(iforce, c + i))
	iforce_dump_packet("info", iforce->ecmd, iforce->edata);

	/*
	* Disable spring, enable force feedback.
	* FIXME: We should use iforce_set_autocenter() et al here.
	*/

	iforce_send_packet(iforce, FF_CMD_AUTOCENTER, "\004\000");

	/*
	* Find appropriate device entry
	*/

	for (i = 0; iforce_device[i].idvendor; i++)
	if (iforce_device[i].idvendor == input_dev->id.vendor &&
	iforce_device[i].idproduct == input_dev->id.product)
	break;

	iforce->type = iforce_device + i;
	input_dev->name = iforce->type->name;

	/*
	* Set input device bitfields and ranges.
	*/

	input_dev->evbit[0] = BIT(EV_KEY) \| BIT(EV_ABS) \| BIT(EV_FF_STATUS);

	for (i = 0; iforce->type->btn[i] >= 0; i++)
	set_bit(iforce->type->btn[i], input_dev->keybit);
	set_bit(BTN_DEAD, input_dev->keybit);

	for (i = 0; iforce->type->abs[i] >= 0; i++) {

	signed short t = iforce->type->abs[i];

	switch (t) {

	case ABS_X:
	case ABS_Y:
	case ABS_WHEEL:

	input_set_abs_params(input_dev, t, -1920, 1920, 16, 128);
	set_bit(t, input_dev->ffbit);
	break;

	case ABS_THROTTLE:
	case ABS_GAS:
	case ABS_BRAKE:

	input_set_abs_params(input_dev, t, 0, 255, 0, 0);
	break;

	case ABS_RUDDER:

	input_set_abs_params(input_dev, t, -128, 127, 0, 0);
	break;

	case ABS_HAT0X:
	case ABS_HAT0Y:
	case ABS_HAT1X:
	case ABS_HAT1Y:

	input_set_abs_params(input_dev, t, -1, 1, 0, 0);
	break;
	}
	}

	if (ff_effects) {

	for (i = 0; iforce->type->ff[i] >= 0; i++)
	set_bit(iforce->type->ff[i], input_dev->ffbit);

	error = input_ff_create(input_dev, ff_effects);
	if (error)
	goto fail;

	ff = input_dev->ff;
	ff->upload = iforce_upload_effect;
	ff->erase = iforce_erase_effect;
	ff->set_gain = iforce_set_gain;
	ff->set_autocenter = iforce_set_autocenter;
	ff->playback = iforce_playback;
	}
	/*
	* Register input device.
	*/

	error = input_register_device(iforce->dev);
	if (error)
	goto fail;

	printk(KERN_DEBUG "iforce->dev->open = %p\n", iforce->dev->open);

	return 0;

	fail: input_free_device(input_dev);
	return error;
	}

	static int __init iforce_init(void)
	{
	#ifdef CONFIG_JOYSTICK_IFORCE_USB
	usb_register(&iforce_usb_driver);
	#endif
	#ifdef CONFIG_JOYSTICK_IFORCE_232
	serio_register_driver(&iforce_serio_drv);
	#endif
	return 0;
	}

	static void __exit iforce_exit(void)
	{
	#ifdef CONFIG_JOYSTICK_IFORCE_USB
	usb_deregister(&iforce_usb_driver);
	#endif
	#ifdef CONFIG_JOYSTICK_IFORCE_232
	serio_unregister_driver(&iforce_serio_drv);
	#endif
	}

	module_init(iforce_init);
	module_exit(iforce_exit);