drivers/input/mousedev.c - kernel/msm-5.4 - Gitiles

 /*
  * Input driver to ExplorerPS/2 device driver module.
  *
  * Copyright (c) 1999-2002 Vojtech Pavlik
  * Copyright (c) 2004      Dmitry Torokhov
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as published by
  * the Free Software Foundation.
  */

 #define MOUSEDEV_MINOR_BASE	32
 #define MOUSEDEV_MINORS		32
 #define MOUSEDEV_MIX		31

 #include <linux/slab.h>
 #include <linux/poll.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/init.h>
 #include <linux/input.h>
 #include <linux/config.h>
 #include <linux/smp_lock.h>
 #include <linux/random.h>
 #include <linux/major.h>
 #include <linux/device.h>
 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 #include <linux/miscdevice.h>
 #endif

 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
 MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces");
 MODULE_LICENSE("GPL");

 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X
 #define CONFIG_INPUT_MOUSEDEV_SCREEN_X	1024
 #endif
 #ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y
 #define CONFIG_INPUT_MOUSEDEV_SCREEN_Y	768
 #endif

 static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X;
 module_param(xres, uint, 0644);
 MODULE_PARM_DESC(xres, "Horizontal screen resolution");

 static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y;
 module_param(yres, uint, 0644);
 MODULE_PARM_DESC(yres, "Vertical screen resolution");

 static unsigned tap_time = 200;
 module_param(tap_time, uint, 0644);
 MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)");

 struct mousedev_hw_data {
 	int dx, dy, dz;
 	int x, y;
 	int abs_event;
 	unsigned long buttons;
 };

 struct mousedev {
 	int exist;
 	int open;
 	int minor;
 	char name[16];
 	wait_queue_head_t wait;
 	struct list_head list;
 	struct input_handle handle;

 	struct mousedev_hw_data packet;
 	unsigned int pkt_count;
 	int old_x[4], old_y[4];
 	int frac_dx, frac_dy;
 	unsigned long touch;
 };

 enum mousedev_emul {
 	MOUSEDEV_EMUL_PS2,
 	MOUSEDEV_EMUL_IMPS,
 	MOUSEDEV_EMUL_EXPS
 };

 struct mousedev_motion {
 	int dx, dy, dz;
 	unsigned long buttons;
 };

 #define PACKET_QUEUE_LEN	16
 struct mousedev_list {
 	struct fasync_struct *fasync;
 	struct mousedev *mousedev;
 	struct list_head node;

 	struct mousedev_motion packets[PACKET_QUEUE_LEN];
 	unsigned int head, tail;
 	spinlock_t packet_lock;
 	int pos_x, pos_y;

 	signed char ps2[6];
 	unsigned char ready, buffer, bufsiz;
 	unsigned char imexseq, impsseq;
 	enum mousedev_emul mode;
 	unsigned long last_buttons;
 };

 #define MOUSEDEV_SEQ_LEN	6

 static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
 static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };

 static struct input_handler mousedev_handler;

 static struct mousedev *mousedev_table[MOUSEDEV_MINORS];
 static struct mousedev mousedev_mix;

 #define fx(i)  (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])
 #define fy(i)  (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])

 static void mousedev_touchpad_event(struct input_dev *dev, struct mousedev *mousedev, unsigned int code, int value)
 {
 	int size, tmp;
 	enum { FRACTION_DENOM = 128 };

 	if (mousedev->touch) {
 		size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
 		if (size == 0) size = 256 * 2;
 		switch (code) {
 			case ABS_X:
 				fx(0) = value;
 				if (mousedev->pkt_count >= 2) {
 					tmp = ((value - fx(2)) * (256 * FRACTION_DENOM)) / size;
 					tmp += mousedev->frac_dx;
 					mousedev->packet.dx = tmp / FRACTION_DENOM;
 					mousedev->frac_dx = tmp - mousedev->packet.dx * FRACTION_DENOM;
 				}
 				break;

 			case ABS_Y:
 				fy(0) = value;
 				if (mousedev->pkt_count >= 2) {
 					tmp = -((value - fy(2)) * (256 * FRACTION_DENOM)) / size;
 					tmp += mousedev->frac_dy;
 					mousedev->packet.dy = tmp / FRACTION_DENOM;
 					mousedev->frac_dy = tmp - mousedev->packet.dy * FRACTION_DENOM;
 				}
 				break;
 		}
 	}
 }

 static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev, unsigned int code, int value)
 {
 	int size;

 	switch (code) {
 		case ABS_X:
 			size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
 			if (size == 0) size = xres ? : 1;
 			if (value > dev->absmax[ABS_X]) value = dev->absmax[ABS_X];
 			if (value < dev->absmin[ABS_X]) value = dev->absmin[ABS_X];
 			mousedev->packet.x = ((value - dev->absmin[ABS_X]) * xres) / size;
 			mousedev->packet.abs_event = 1;
 			break;

 		case ABS_Y:
 			size = dev->absmax[ABS_Y] - dev->absmin[ABS_Y];
 			if (size == 0) size = yres ? : 1;
 			if (value > dev->absmax[ABS_Y]) value = dev->absmax[ABS_Y];
 			if (value < dev->absmin[ABS_Y]) value = dev->absmin[ABS_Y];
 			mousedev->packet.y = yres - ((value - dev->absmin[ABS_Y]) * yres) / size;
 			mousedev->packet.abs_event = 1;
 			break;
 	}
 }

 static void mousedev_rel_event(struct mousedev *mousedev, unsigned int code, int value)
 {
 	switch (code) {
 		case REL_X:	mousedev->packet.dx += value; break;
 		case REL_Y:	mousedev->packet.dy -= value; break;
 		case REL_WHEEL:	mousedev->packet.dz -= value; break;
 	}
 }

 static void mousedev_key_event(struct mousedev *mousedev, unsigned int code, int value)
 {
 	int index;

 	switch (code) {
 		case BTN_TOUCH:
 		case BTN_0:
 		case BTN_FORWARD:
 		case BTN_LEFT:		index = 0; break;
 		case BTN_STYLUS:
 		case BTN_1:
 		case BTN_RIGHT:		index = 1; break;
 		case BTN_2:
 		case BTN_STYLUS2:
 		case BTN_MIDDLE:	index = 2; break;
 		case BTN_3:
 		case BTN_BACK:
 		case BTN_SIDE:		index = 3; break;
 		case BTN_4:
 		case BTN_EXTRA:		index = 4; break;
 		default: 		return;
 	}

 	if (value) {
 		set_bit(index, &mousedev->packet.buttons);
 		set_bit(index, &mousedev_mix.packet.buttons);
 	} else {
 		clear_bit(index, &mousedev->packet.buttons);
 		clear_bit(index, &mousedev_mix.packet.buttons);
 	}
 }

 static void mousedev_notify_readers(struct mousedev *mousedev, struct mousedev_hw_data *packet)
 {
 	struct mousedev_list *list;
 	struct mousedev_motion *p;
 	unsigned long flags;
 	int wake_readers = 0;

 	list_for_each_entry(list, &mousedev->list, node) {
 		spin_lock_irqsave(&list->packet_lock, flags);

 		p = &list->packets[list->head];
 		if (list->ready && p->buttons != mousedev->packet.buttons) {
 			unsigned int new_head = (list->head + 1) % PACKET_QUEUE_LEN;
 			if (new_head != list->tail) {
 				p = &list->packets[list->head = new_head];
 				memset(p, 0, sizeof(struct mousedev_motion));
 			}
 		}

 		if (packet->abs_event) {
 			p->dx += packet->x - list->pos_x;
 			p->dy += packet->y - list->pos_y;
 			list->pos_x = packet->x;
 			list->pos_y = packet->y;
 		}

 		list->pos_x += packet->dx;
 		list->pos_x = list->pos_x < 0 ? 0 : (list->pos_x >= xres ? xres : list->pos_x);
 		list->pos_y += packet->dy;
 		list->pos_y = list->pos_y < 0 ? 0 : (list->pos_y >= yres ? yres : list->pos_y);

 		p->dx += packet->dx;
 		p->dy += packet->dy;
 		p->dz += packet->dz;
 		p->buttons = mousedev->packet.buttons;

 		if (p->dx || p->dy || p->dz || p->buttons != list->last_buttons)
 			list->ready = 1;

 		spin_unlock_irqrestore(&list->packet_lock, flags);

 		if (list->ready) {
 			kill_fasync(&list->fasync, SIGIO, POLL_IN);
 			wake_readers = 1;
 		}
 	}

 	if (wake_readers)
 		wake_up_interruptible(&mousedev->wait);
 }

 static void mousedev_touchpad_touch(struct mousedev *mousedev, int value)
 {
 	if (!value) {
 		if (mousedev->touch &&
 		    time_before(jiffies, mousedev->touch + msecs_to_jiffies(tap_time))) {
 			/*
 			 * Toggle left button to emulate tap.
 			 * We rely on the fact that mousedev_mix always has 0
 			 * motion packet so we won't mess current position.
 			 */
 			set_bit(0, &mousedev->packet.buttons);
 			set_bit(0, &mousedev_mix.packet.buttons);
 			mousedev_notify_readers(mousedev, &mousedev_mix.packet);
 			mousedev_notify_readers(&mousedev_mix, &mousedev_mix.packet);
 			clear_bit(0, &mousedev->packet.buttons);
 			clear_bit(0, &mousedev_mix.packet.buttons);
 		}
 		mousedev->touch = mousedev->pkt_count = 0;
 		mousedev->frac_dx = 0;
 		mousedev->frac_dy = 0;
 	}
 	else
 		if (!mousedev->touch)
 			mousedev->touch = jiffies;
 }

 static void mousedev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
 {
 	struct mousedev *mousedev = handle->private;

 	switch (type) {
 		case EV_ABS:
 			/* Ignore joysticks */
 			if (test_bit(BTN_TRIGGER, handle->dev->keybit))
 				return;

 			if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
 				mousedev_touchpad_event(handle->dev, mousedev, code, value);
 			else
 				mousedev_abs_event(handle->dev, mousedev, code, value);

 			break;

 		case EV_REL:
 			mousedev_rel_event(mousedev, code, value);
 			break;

 		case EV_KEY:
 			if (value != 2) {
 				if (code == BTN_TOUCH && test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
 					mousedev_touchpad_touch(mousedev, value);
 				else
 					mousedev_key_event(mousedev, code, value);
 			}
 			break;

 		case EV_SYN:
 			if (code == SYN_REPORT) {
 				if (mousedev->touch) {
 					mousedev->pkt_count++;
 					/* Input system eats duplicate events, but we need all of them
 					 * to do correct averaging so apply present one forward
 			 		 */
 					fx(0) = fx(1);
 					fy(0) = fy(1);
 				}

 				mousedev_notify_readers(mousedev, &mousedev->packet);
 				mousedev_notify_readers(&mousedev_mix, &mousedev->packet);

 				mousedev->packet.dx = mousedev->packet.dy = mousedev->packet.dz = 0;
 				mousedev->packet.abs_event = 0;
 			}
 			break;
 	}
 }

 static int mousedev_fasync(int fd, struct file *file, int on)
 {
 	int retval;
 	struct mousedev_list *list = file->private_data;
 	retval = fasync_helper(fd, file, on, &list->fasync);
 	return retval < 0 ? retval : 0;
 }

 static void mousedev_free(struct mousedev *mousedev)
 {
 	mousedev_table[mousedev->minor] = NULL;
 	kfree(mousedev);
 }

 static void mixdev_release(void)
 {
 	struct input_handle *handle;

 	list_for_each_entry(handle, &mousedev_handler.h_list, h_node) {
 		struct mousedev *mousedev = handle->private;

 		if (!mousedev->open) {
 			if (mousedev->exist)
 				input_close_device(&mousedev->handle);
 			else
 				mousedev_free(mousedev);
 		}
 	}
 }

 static int mousedev_release(struct inode * inode, struct file * file)
 {
 	struct mousedev_list *list = file->private_data;

 	mousedev_fasync(-1, file, 0);

 	list_del(&list->node);

 	if (!--list->mousedev->open) {
 		if (list->mousedev->minor == MOUSEDEV_MIX)
 			mixdev_release();
 		else if (!mousedev_mix.open) {
 			if (list->mousedev->exist)
 				input_close_device(&list->mousedev->handle);
 			else
 				mousedev_free(list->mousedev);
 		}
 	}

 	kfree(list);
 	return 0;
 }

 static int mousedev_open(struct inode * inode, struct file * file)
 {
 	struct mousedev_list *list;
 	struct input_handle *handle;
 	struct mousedev *mousedev;
 	int i;

 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 	if (imajor(inode) == MISC_MAJOR)
 		i = MOUSEDEV_MIX;
 	else
 #endif
 		i = iminor(inode) - MOUSEDEV_MINOR_BASE;

 	if (i >= MOUSEDEV_MINORS || !mousedev_table[i])
 		return -ENODEV;

 	if (!(list = kzalloc(sizeof(struct mousedev_list), GFP_KERNEL)))
 		return -ENOMEM;

 	spin_lock_init(&list->packet_lock);
 	list->pos_x = xres / 2;
 	list->pos_y = yres / 2;
 	list->mousedev = mousedev_table[i];
 	list_add_tail(&list->node, &mousedev_table[i]->list);
 	file->private_data = list;

 	if (!list->mousedev->open++) {
 		if (list->mousedev->minor == MOUSEDEV_MIX) {
 			list_for_each_entry(handle, &mousedev_handler.h_list, h_node) {
 				mousedev = handle->private;
 				if (!mousedev->open && mousedev->exist)
 					input_open_device(handle);
 			}
 		} else
 			if (!mousedev_mix.open && list->mousedev->exist)
 				input_open_device(&list->mousedev->handle);
 	}

 	return 0;
 }

 static inline int mousedev_limit_delta(int delta, int limit)
 {
 	return delta > limit ? limit : (delta < -limit ? -limit : delta);
 }

 static void mousedev_packet(struct mousedev_list *list, signed char *ps2_data)
 {
 	struct mousedev_motion *p;
 	unsigned long flags;

 	spin_lock_irqsave(&list->packet_lock, flags);
 	p = &list->packets[list->tail];

 	ps2_data[0] = 0x08 | ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
 	ps2_data[1] = mousedev_limit_delta(p->dx, 127);
 	ps2_data[2] = mousedev_limit_delta(p->dy, 127);
 	p->dx -= ps2_data[1];
 	p->dy -= ps2_data[2];

 	switch (list->mode) {
 		case MOUSEDEV_EMUL_EXPS:
 			ps2_data[3] = mousedev_limit_delta(p->dz, 7);
 			p->dz -= ps2_data[3];
 			ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
 			list->bufsiz = 4;
 			break;

 		case MOUSEDEV_EMUL_IMPS:
 			ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
 			ps2_data[3] = mousedev_limit_delta(p->dz, 127);
 			p->dz -= ps2_data[3];
 			list->bufsiz = 4;
 			break;

 		case MOUSEDEV_EMUL_PS2:
 		default:
 			ps2_data[0] |= ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
 			p->dz = 0;
 			list->bufsiz = 3;
 			break;
 	}

 	if (!p->dx && !p->dy && !p->dz) {
 		if (list->tail == list->head) {
 			list->ready = 0;
 			list->last_buttons = p->buttons;
 		} else
 			list->tail = (list->tail + 1) % PACKET_QUEUE_LEN;
 	}

 	spin_unlock_irqrestore(&list->packet_lock, flags);
 }


 static ssize_t mousedev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
 {
 	struct mousedev_list *list = file->private_data;
 	unsigned char c;
 	unsigned int i;

 	for (i = 0; i < count; i++) {

 		if (get_user(c, buffer + i))
 			return -EFAULT;

 		if (c == mousedev_imex_seq[list->imexseq]) {
 			if (++list->imexseq == MOUSEDEV_SEQ_LEN) {
 				list->imexseq = 0;
 				list->mode = MOUSEDEV_EMUL_EXPS;
 			}
 		} else list->imexseq = 0;

 		if (c == mousedev_imps_seq[list->impsseq]) {
 			if (++list->impsseq == MOUSEDEV_SEQ_LEN) {
 				list->impsseq = 0;
 				list->mode = MOUSEDEV_EMUL_IMPS;
 			}
 		} else list->impsseq = 0;

 		list->ps2[0] = 0xfa;

 		switch (c) {

 			case 0xeb: /* Poll */
 				mousedev_packet(list, &list->ps2[1]);
 				list->bufsiz++; /* account for leading ACK */
 				break;

 			case 0xf2: /* Get ID */
 				switch (list->mode) {
 					case MOUSEDEV_EMUL_PS2:  list->ps2[1] = 0; break;
 					case MOUSEDEV_EMUL_IMPS: list->ps2[1] = 3; break;
 					case MOUSEDEV_EMUL_EXPS: list->ps2[1] = 4; break;
 				}
 				list->bufsiz = 2;
 				break;

 			case 0xe9: /* Get info */
 				list->ps2[1] = 0x60; list->ps2[2] = 3; list->ps2[3] = 200;
 				list->bufsiz = 4;
 				break;

 			case 0xff: /* Reset */
 				list->impsseq = list->imexseq = 0;
 				list->mode = MOUSEDEV_EMUL_PS2;
 				list->ps2[1] = 0xaa; list->ps2[2] = 0x00;
 				list->bufsiz = 3;
 				break;

 			default:
 				list->bufsiz = 1;
 				break;
 		}

 		list->buffer = list->bufsiz;
 	}

 	kill_fasync(&list->fasync, SIGIO, POLL_IN);

 	wake_up_interruptible(&list->mousedev->wait);

 	return count;
 }

 static ssize_t mousedev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
 {
 	struct mousedev_list *list = file->private_data;
 	int retval = 0;

 	if (!list->ready && !list->buffer && (file->f_flags & O_NONBLOCK))
 		return -EAGAIN;

 	retval = wait_event_interruptible(list->mousedev->wait,
 					  !list->mousedev->exist || list->ready || list->buffer);

 	if (retval)
 		return retval;

 	if (!list->mousedev->exist)
 		return -ENODEV;

 	if (!list->buffer && list->ready) {
 		mousedev_packet(list, list->ps2);
 		list->buffer = list->bufsiz;
 	}

 	if (count > list->buffer)
 		count = list->buffer;

 	list->buffer -= count;

 	if (copy_to_user(buffer, list->ps2 + list->bufsiz - list->buffer - count, count))
 		return -EFAULT;

 	return count;
 }

 /* No kernel lock - fine */
 static unsigned int mousedev_poll(struct file *file, poll_table *wait)
 {
 	struct mousedev_list *list = file->private_data;
 	poll_wait(file, &list->mousedev->wait, wait);
 	return ((list->ready || list->buffer) ? (POLLIN | POLLRDNORM) : 0) |
 		(list->mousedev->exist ? 0 : (POLLHUP | POLLERR));
 }

 static struct file_operations mousedev_fops = {
 	.owner =	THIS_MODULE,
 	.read =		mousedev_read,
 	.write =	mousedev_write,
 	.poll =		mousedev_poll,
 	.open =		mousedev_open,
 	.release =	mousedev_release,
 	.fasync =	mousedev_fasync,
 };

 static struct input_handle *mousedev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
 {
 	struct mousedev *mousedev;
 	struct class_device *cdev;
 	int minor = 0;

 	for (minor = 0; minor < MOUSEDEV_MINORS && mousedev_table[minor]; minor++);
 	if (minor == MOUSEDEV_MINORS) {
 		printk(KERN_ERR "mousedev: no more free mousedev devices\n");
 		return NULL;
 	}

 	if (!(mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL)))
 		return NULL;

 	INIT_LIST_HEAD(&mousedev->list);
 	init_waitqueue_head(&mousedev->wait);

 	mousedev->minor = minor;
 	mousedev->exist = 1;
 	mousedev->handle.dev = dev;
 	mousedev->handle.name = mousedev->name;
 	mousedev->handle.handler = handler;
 	mousedev->handle.private = mousedev;
 	sprintf(mousedev->name, "mouse%d", minor);

 	if (mousedev_mix.open)
 		input_open_device(&mousedev->handle);

 	mousedev_table[minor] = mousedev;

 	cdev = class_device_create(&input_class, &dev->cdev,
 			MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor),
 			dev->cdev.dev, mousedev->name);

 	/* temporary symlink to keep userspace happy */
 	sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj,
 			  mousedev->name);

 	return &mousedev->handle;
 }

 static void mousedev_disconnect(struct input_handle *handle)
 {
 	struct mousedev *mousedev = handle->private;
 	struct mousedev_list *list;

 	sysfs_remove_link(&input_class.subsys.kset.kobj, mousedev->name);
 	class_device_destroy(&input_class,
 			MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + mousedev->minor));
 	mousedev->exist = 0;

 	if (mousedev->open) {
 		input_close_device(handle);
 		wake_up_interruptible(&mousedev->wait);
 		list_for_each_entry(list, &mousedev->list, node)
 			kill_fasync(&list->fasync, SIGIO, POLL_HUP);
 	} else {
 		if (mousedev_mix.open)
 			input_close_device(handle);
 		mousedev_free(mousedev);
 	}
 }

 static struct input_device_id mousedev_ids[] = {
 	{
 		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
 		.evbit = { BIT(EV_KEY) | BIT(EV_REL) },
 		.keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) },
 		.relbit = { BIT(REL_X) | BIT(REL_Y) },
 	},	/* A mouse like device, at least one button, two relative axes */
 	{
 		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
 		.evbit = { BIT(EV_KEY) | BIT(EV_REL) },
 		.relbit = { BIT(REL_WHEEL) },
 	},	/* A separate scrollwheel */
 	{
 		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 		.evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
 		.keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
 		.absbit = { BIT(ABS_X) | BIT(ABS_Y) },
 	},	/* A tablet like device, at least touch detection, two absolute axes */
 	{
 		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 		.evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
 		.keybit = { [LONG(BTN_TOOL_FINGER)] = BIT(BTN_TOOL_FINGER) },
 		.absbit = { BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE) | BIT(ABS_TOOL_WIDTH) },
 	},	/* A touchpad */

 	{ }, 	/* Terminating entry */
 };

 MODULE_DEVICE_TABLE(input, mousedev_ids);

 static struct input_handler mousedev_handler = {
 	.event =	mousedev_event,
 	.connect =	mousedev_connect,
 	.disconnect =	mousedev_disconnect,
 	.fops =		&mousedev_fops,
 	.minor =	MOUSEDEV_MINOR_BASE,
 	.name =		"mousedev",
 	.id_table =	mousedev_ids,
 };

 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 static struct miscdevice psaux_mouse = {
 	PSMOUSE_MINOR, "psaux", &mousedev_fops
 };
 static int psaux_registered;
 #endif

 static int __init mousedev_init(void)
 {
 	input_register_handler(&mousedev_handler);

 	memset(&mousedev_mix, 0, sizeof(struct mousedev));
 	INIT_LIST_HEAD(&mousedev_mix.list);
 	init_waitqueue_head(&mousedev_mix.wait);
 	mousedev_table[MOUSEDEV_MIX] = &mousedev_mix;
 	mousedev_mix.exist = 1;
 	mousedev_mix.minor = MOUSEDEV_MIX;

 	class_device_create(&input_class, NULL,
 			MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX), NULL, "mice");

 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 	if (!(psaux_registered = !misc_register(&psaux_mouse)))
 		printk(KERN_WARNING "mice: could not misc_register the device\n");
 #endif

 	printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");

 	return 0;
 }

 static void __exit mousedev_exit(void)
 {
 #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
 	if (psaux_registered)
 		misc_deregister(&psaux_mouse);
 #endif
 	class_device_destroy(&input_class,
 			MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX));
 	input_unregister_handler(&mousedev_handler);
 }

 module_init(mousedev_init);
 module_exit(mousedev_exit);
	/*
	* Input driver to ExplorerPS/2 device driver module.
	*
	* Copyright (c) 1999-2002 Vojtech Pavlik
	* Copyright (c) 2004 Dmitry Torokhov
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as published by
	* the Free Software Foundation.
	*/

	#define MOUSEDEV_MINOR_BASE 32
	#define MOUSEDEV_MINORS 32
	#define MOUSEDEV_MIX 31

	#include <linux/slab.h>
	#include <linux/poll.h>
	#include <linux/module.h>
	#include <linux/moduleparam.h>
	#include <linux/init.h>
	#include <linux/input.h>
	#include <linux/config.h>
	#include <linux/smp_lock.h>
	#include <linux/random.h>
	#include <linux/major.h>
	#include <linux/device.h>
	#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
	#include <linux/miscdevice.h>
	#endif

	MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
	MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces");
	MODULE_LICENSE("GPL");

	#ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X
	#define CONFIG_INPUT_MOUSEDEV_SCREEN_X 1024
	#endif
	#ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y
	#define CONFIG_INPUT_MOUSEDEV_SCREEN_Y 768
	#endif

	static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X;
	module_param(xres, uint, 0644);
	MODULE_PARM_DESC(xres, "Horizontal screen resolution");

	static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y;
	module_param(yres, uint, 0644);
	MODULE_PARM_DESC(yres, "Vertical screen resolution");

	static unsigned tap_time = 200;
	module_param(tap_time, uint, 0644);
	MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)");

	struct mousedev_hw_data {
	int dx, dy, dz;
	int x, y;
	int abs_event;
	unsigned long buttons;
	};

	struct mousedev {
	int exist;
	int open;
	int minor;
	char name[16];
	wait_queue_head_t wait;
	struct list_head list;
	struct input_handle handle;

	struct mousedev_hw_data packet;
	unsigned int pkt_count;
	int old_x[4], old_y[4];
	int frac_dx, frac_dy;
	unsigned long touch;
	};

	enum mousedev_emul {
	MOUSEDEV_EMUL_PS2,
	MOUSEDEV_EMUL_IMPS,
	MOUSEDEV_EMUL_EXPS
	};

	struct mousedev_motion {
	int dx, dy, dz;
	unsigned long buttons;
	};

	#define PACKET_QUEUE_LEN 16
	struct mousedev_list {
	struct fasync_struct *fasync;
	struct mousedev *mousedev;
	struct list_head node;

	struct mousedev_motion packets[PACKET_QUEUE_LEN];
	unsigned int head, tail;
	spinlock_t packet_lock;
	int pos_x, pos_y;

	signed char ps2[6];
	unsigned char ready, buffer, bufsiz;
	unsigned char imexseq, impsseq;
	enum mousedev_emul mode;
	unsigned long last_buttons;
	};

	#define MOUSEDEV_SEQ_LEN 6

	static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
	static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };

	static struct input_handler mousedev_handler;

	static struct mousedev *mousedev_table[MOUSEDEV_MINORS];
	static struct mousedev mousedev_mix;

	#define fx(i) (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])
	#define fy(i) (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])

	static void mousedev_touchpad_event(struct input_dev dev, struct mousedev mousedev, unsigned int code, int value)
	{
	int size, tmp;
	enum { FRACTION_DENOM = 128 };

	if (mousedev->touch) {
	size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
	if (size == 0) size = 256 * 2;
	switch (code) {
	case ABS_X:
	fx(0) = value;
	if (mousedev->pkt_count >= 2) {
	tmp = ((value - fx(2)) * (256 * FRACTION_DENOM)) / size;
	tmp += mousedev->frac_dx;
	mousedev->packet.dx = tmp / FRACTION_DENOM;
	mousedev->frac_dx = tmp - mousedev->packet.dx * FRACTION_DENOM;
	}
	break;

	case ABS_Y:
	fy(0) = value;
	if (mousedev->pkt_count >= 2) {
	tmp = -((value - fy(2)) * (256 * FRACTION_DENOM)) / size;
	tmp += mousedev->frac_dy;
	mousedev->packet.dy = tmp / FRACTION_DENOM;
	mousedev->frac_dy = tmp - mousedev->packet.dy * FRACTION_DENOM;
	}
	break;
	}
	}
	}

	static void mousedev_abs_event(struct input_dev dev, struct mousedev mousedev, unsigned int code, int value)
	{
	int size;

	switch (code) {
	case ABS_X:
	size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
	if (size == 0) size = xres ? : 1;
	if (value > dev->absmax[ABS_X]) value = dev->absmax[ABS_X];
	if (value < dev->absmin[ABS_X]) value = dev->absmin[ABS_X];
	mousedev->packet.x = ((value - dev->absmin[ABS_X]) * xres) / size;
	mousedev->packet.abs_event = 1;
	break;

	case ABS_Y:
	size = dev->absmax[ABS_Y] - dev->absmin[ABS_Y];
	if (size == 0) size = yres ? : 1;
	if (value > dev->absmax[ABS_Y]) value = dev->absmax[ABS_Y];
	if (value < dev->absmin[ABS_Y]) value = dev->absmin[ABS_Y];
	mousedev->packet.y = yres - ((value - dev->absmin[ABS_Y]) * yres) / size;
	mousedev->packet.abs_event = 1;
	break;
	}
	}

	static void mousedev_rel_event(struct mousedev *mousedev, unsigned int code, int value)
	{
	switch (code) {
	case REL_X: mousedev->packet.dx += value; break;
	case REL_Y: mousedev->packet.dy -= value; break;
	case REL_WHEEL: mousedev->packet.dz -= value; break;
	}
	}

	static void mousedev_key_event(struct mousedev *mousedev, unsigned int code, int value)
	{
	int index;

	switch (code) {
	case BTN_TOUCH:
	case BTN_0:
	case BTN_FORWARD:
	case BTN_LEFT: index = 0; break;
	case BTN_STYLUS:
	case BTN_1:
	case BTN_RIGHT: index = 1; break;
	case BTN_2:
	case BTN_STYLUS2:
	case BTN_MIDDLE: index = 2; break;
	case BTN_3:
	case BTN_BACK:
	case BTN_SIDE: index = 3; break;
	case BTN_4:
	case BTN_EXTRA: index = 4; break;
	default: return;
	}

	if (value) {
	set_bit(index, &mousedev->packet.buttons);
	set_bit(index, &mousedev_mix.packet.buttons);
	} else {
	clear_bit(index, &mousedev->packet.buttons);
	clear_bit(index, &mousedev_mix.packet.buttons);
	}
	}

	static void mousedev_notify_readers(struct mousedev mousedev, struct mousedev_hw_data packet)
	{
	struct mousedev_list *list;
	struct mousedev_motion *p;
	unsigned long flags;
	int wake_readers = 0;

	list_for_each_entry(list, &mousedev->list, node) {
	spin_lock_irqsave(&list->packet_lock, flags);

	p = &list->packets[list->head];
	if (list->ready && p->buttons != mousedev->packet.buttons) {
	unsigned int new_head = (list->head + 1) % PACKET_QUEUE_LEN;
	if (new_head != list->tail) {
	p = &list->packets[list->head = new_head];
	memset(p, 0, sizeof(struct mousedev_motion));
	}
	}

	if (packet->abs_event) {
	p->dx += packet->x - list->pos_x;
	p->dy += packet->y - list->pos_y;
	list->pos_x = packet->x;
	list->pos_y = packet->y;
	}

	list->pos_x += packet->dx;
	list->pos_x = list->pos_x < 0 ? 0 : (list->pos_x >= xres ? xres : list->pos_x);
	list->pos_y += packet->dy;
	list->pos_y = list->pos_y < 0 ? 0 : (list->pos_y >= yres ? yres : list->pos_y);

	p->dx += packet->dx;
	p->dy += packet->dy;
	p->dz += packet->dz;
	p->buttons = mousedev->packet.buttons;

	if (p->dx \|\| p->dy \|\| p->dz \|\| p->buttons != list->last_buttons)
	list->ready = 1;

	spin_unlock_irqrestore(&list->packet_lock, flags);

	if (list->ready) {
	kill_fasync(&list->fasync, SIGIO, POLL_IN);
	wake_readers = 1;
	}
	}

	if (wake_readers)
	wake_up_interruptible(&mousedev->wait);
	}

	static void mousedev_touchpad_touch(struct mousedev *mousedev, int value)
	{
	if (!value) {
	if (mousedev->touch &&
	time_before(jiffies, mousedev->touch + msecs_to_jiffies(tap_time))) {
	/*
	* Toggle left button to emulate tap.
	* We rely on the fact that mousedev_mix always has 0
	* motion packet so we won't mess current position.
	*/
	set_bit(0, &mousedev->packet.buttons);
	set_bit(0, &mousedev_mix.packet.buttons);
	mousedev_notify_readers(mousedev, &mousedev_mix.packet);
	mousedev_notify_readers(&mousedev_mix, &mousedev_mix.packet);
	clear_bit(0, &mousedev->packet.buttons);
	clear_bit(0, &mousedev_mix.packet.buttons);
	}
	mousedev->touch = mousedev->pkt_count = 0;
	mousedev->frac_dx = 0;
	mousedev->frac_dy = 0;
	}
	else
	if (!mousedev->touch)
	mousedev->touch = jiffies;
	}

	static void mousedev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
	{
	struct mousedev *mousedev = handle->private;

	switch (type) {
	case EV_ABS:
	/* Ignore joysticks */
	if (test_bit(BTN_TRIGGER, handle->dev->keybit))
	return;

	if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
	mousedev_touchpad_event(handle->dev, mousedev, code, value);
	else
	mousedev_abs_event(handle->dev, mousedev, code, value);

	break;

	case EV_REL:
	mousedev_rel_event(mousedev, code, value);
	break;

	case EV_KEY:
	if (value != 2) {
	if (code == BTN_TOUCH && test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
	mousedev_touchpad_touch(mousedev, value);
	else
	mousedev_key_event(mousedev, code, value);
	}
	break;

	case EV_SYN:
	if (code == SYN_REPORT) {
	if (mousedev->touch) {
	mousedev->pkt_count++;
	/* Input system eats duplicate events, but we need all of them
	* to do correct averaging so apply present one forward
	*/
	fx(0) = fx(1);
	fy(0) = fy(1);
	}

	mousedev_notify_readers(mousedev, &mousedev->packet);
	mousedev_notify_readers(&mousedev_mix, &mousedev->packet);

	mousedev->packet.dx = mousedev->packet.dy = mousedev->packet.dz = 0;
	mousedev->packet.abs_event = 0;
	}
	break;
	}
	}

	static int mousedev_fasync(int fd, struct file *file, int on)
	{
	int retval;
	struct mousedev_list *list = file->private_data;
	retval = fasync_helper(fd, file, on, &list->fasync);
	return retval < 0 ? retval : 0;
	}

	static void mousedev_free(struct mousedev *mousedev)
	{
	mousedev_table[mousedev->minor] = NULL;
	kfree(mousedev);
	}

	static void mixdev_release(void)
	{
	struct input_handle *handle;

	list_for_each_entry(handle, &mousedev_handler.h_list, h_node) {
	struct mousedev *mousedev = handle->private;

	if (!mousedev->open) {
	if (mousedev->exist)
	input_close_device(&mousedev->handle);
	else
	mousedev_free(mousedev);
	}
	}
	}

	static int mousedev_release(struct inode * inode, struct file * file)
	{
	struct mousedev_list *list = file->private_data;

	mousedev_fasync(-1, file, 0);

	list_del(&list->node);

	if (!--list->mousedev->open) {
	if (list->mousedev->minor == MOUSEDEV_MIX)
	mixdev_release();
	else if (!mousedev_mix.open) {
	if (list->mousedev->exist)
	input_close_device(&list->mousedev->handle);
	else
	mousedev_free(list->mousedev);
	}
	}

	kfree(list);
	return 0;
	}

	static int mousedev_open(struct inode * inode, struct file * file)
	{
	struct mousedev_list *list;
	struct input_handle *handle;
	struct mousedev *mousedev;
	int i;

	#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
	if (imajor(inode) == MISC_MAJOR)
	i = MOUSEDEV_MIX;
	else
	#endif
	i = iminor(inode) - MOUSEDEV_MINOR_BASE;

	if (i >= MOUSEDEV_MINORS \|\| !mousedev_table[i])
	return -ENODEV;

	if (!(list = kzalloc(sizeof(struct mousedev_list), GFP_KERNEL)))
	return -ENOMEM;

	spin_lock_init(&list->packet_lock);
	list->pos_x = xres / 2;
	list->pos_y = yres / 2;
	list->mousedev = mousedev_table[i];
	list_add_tail(&list->node, &mousedev_table[i]->list);
	file->private_data = list;

	if (!list->mousedev->open++) {
	if (list->mousedev->minor == MOUSEDEV_MIX) {
	list_for_each_entry(handle, &mousedev_handler.h_list, h_node) {
	mousedev = handle->private;
	if (!mousedev->open && mousedev->exist)
	input_open_device(handle);
	}
	} else
	if (!mousedev_mix.open && list->mousedev->exist)
	input_open_device(&list->mousedev->handle);
	}

	return 0;
	}

	static inline int mousedev_limit_delta(int delta, int limit)
	{
	return delta > limit ? limit : (delta < -limit ? -limit : delta);
	}

	static void mousedev_packet(struct mousedev_list list, signed char ps2_data)
	{
	struct mousedev_motion *p;
	unsigned long flags;

	spin_lock_irqsave(&list->packet_lock, flags);
	p = &list->packets[list->tail];

	ps2_data[0] = 0x08 \| ((p->dx < 0) << 4) \| ((p->dy < 0) << 5) \| (p->buttons & 0x07);
	ps2_data[1] = mousedev_limit_delta(p->dx, 127);
	ps2_data[2] = mousedev_limit_delta(p->dy, 127);
	p->dx -= ps2_data[1];
	p->dy -= ps2_data[2];

	switch (list->mode) {
	case MOUSEDEV_EMUL_EXPS:
	ps2_data[3] = mousedev_limit_delta(p->dz, 7);
	p->dz -= ps2_data[3];
	ps2_data[3] = (ps2_data[3] & 0x0f) \| ((p->buttons & 0x18) << 1);
	list->bufsiz = 4;
	break;

	case MOUSEDEV_EMUL_IMPS:
	ps2_data[0] \|= ((p->buttons & 0x10) >> 3) \| ((p->buttons & 0x08) >> 1);
	ps2_data[3] = mousedev_limit_delta(p->dz, 127);
	p->dz -= ps2_data[3];
	list->bufsiz = 4;
	break;

	case MOUSEDEV_EMUL_PS2:
	default:
	ps2_data[0] \|= ((p->buttons & 0x10) >> 3) \| ((p->buttons & 0x08) >> 1);
	p->dz = 0;
	list->bufsiz = 3;
	break;
	}

	if (!p->dx && !p->dy && !p->dz) {
	if (list->tail == list->head) {
	list->ready = 0;
	list->last_buttons = p->buttons;
	} else
	list->tail = (list->tail + 1) % PACKET_QUEUE_LEN;
	}

	spin_unlock_irqrestore(&list->packet_lock, flags);
	}


	static ssize_t mousedev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
	{
	struct mousedev_list *list = file->private_data;
	unsigned char c;
	unsigned int i;

	for (i = 0; i < count; i++) {

	if (get_user(c, buffer + i))
	return -EFAULT;

	if (c == mousedev_imex_seq[list->imexseq]) {
	if (++list->imexseq == MOUSEDEV_SEQ_LEN) {
	list->imexseq = 0;
	list->mode = MOUSEDEV_EMUL_EXPS;
	}
	} else list->imexseq = 0;

	if (c == mousedev_imps_seq[list->impsseq]) {
	if (++list->impsseq == MOUSEDEV_SEQ_LEN) {
	list->impsseq = 0;
	list->mode = MOUSEDEV_EMUL_IMPS;
	}
	} else list->impsseq = 0;

	list->ps2[0] = 0xfa;

	switch (c) {

	case 0xeb: /* Poll */
	mousedev_packet(list, &list->ps2[1]);
	list->bufsiz++; /* account for leading ACK */
	break;

	case 0xf2: /* Get ID */
	switch (list->mode) {
	case MOUSEDEV_EMUL_PS2: list->ps2[1] = 0; break;
	case MOUSEDEV_EMUL_IMPS: list->ps2[1] = 3; break;
	case MOUSEDEV_EMUL_EXPS: list->ps2[1] = 4; break;
	}
	list->bufsiz = 2;
	break;

	case 0xe9: /* Get info */
	list->ps2[1] = 0x60; list->ps2[2] = 3; list->ps2[3] = 200;
	list->bufsiz = 4;
	break;

	case 0xff: /* Reset */
	list->impsseq = list->imexseq = 0;
	list->mode = MOUSEDEV_EMUL_PS2;
	list->ps2[1] = 0xaa; list->ps2[2] = 0x00;
	list->bufsiz = 3;
	break;

	default:
	list->bufsiz = 1;
	break;
	}

	list->buffer = list->bufsiz;
	}

	kill_fasync(&list->fasync, SIGIO, POLL_IN);

	wake_up_interruptible(&list->mousedev->wait);

	return count;
	}

	static ssize_t mousedev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
	{
	struct mousedev_list *list = file->private_data;
	int retval = 0;

	if (!list->ready && !list->buffer && (file->f_flags & O_NONBLOCK))
	return -EAGAIN;

	retval = wait_event_interruptible(list->mousedev->wait,
	!list->mousedev->exist \|\| list->ready \|\| list->buffer);

	if (retval)
	return retval;

	if (!list->mousedev->exist)
	return -ENODEV;

	if (!list->buffer && list->ready) {
	mousedev_packet(list, list->ps2);
	list->buffer = list->bufsiz;
	}

	if (count > list->buffer)
	count = list->buffer;

	list->buffer -= count;

	if (copy_to_user(buffer, list->ps2 + list->bufsiz - list->buffer - count, count))
	return -EFAULT;

	return count;
	}

	/* No kernel lock - fine */
	static unsigned int mousedev_poll(struct file file, poll_table wait)
	{
	struct mousedev_list *list = file->private_data;
	poll_wait(file, &list->mousedev->wait, wait);
	return ((list->ready \|\| list->buffer) ? (POLLIN \| POLLRDNORM) : 0) \|
	(list->mousedev->exist ? 0 : (POLLHUP \| POLLERR));
	}

	static struct file_operations mousedev_fops = {
	.owner = THIS_MODULE,
	.read = mousedev_read,
	.write = mousedev_write,
	.poll = mousedev_poll,
	.open = mousedev_open,
	.release = mousedev_release,
	.fasync = mousedev_fasync,
	};

	static struct input_handle mousedev_connect(struct input_handler handler, struct input_dev dev, struct input_device_id id)
	{
	struct mousedev *mousedev;
	struct class_device *cdev;
	int minor = 0;

	for (minor = 0; minor < MOUSEDEV_MINORS && mousedev_table[minor]; minor++);
	if (minor == MOUSEDEV_MINORS) {
	printk(KERN_ERR "mousedev: no more free mousedev devices\n");
	return NULL;
	}

	if (!(mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL)))
	return NULL;

	INIT_LIST_HEAD(&mousedev->list);
	init_waitqueue_head(&mousedev->wait);

	mousedev->minor = minor;
	mousedev->exist = 1;
	mousedev->handle.dev = dev;
	mousedev->handle.name = mousedev->name;
	mousedev->handle.handler = handler;
	mousedev->handle.private = mousedev;
	sprintf(mousedev->name, "mouse%d", minor);

	if (mousedev_mix.open)
	input_open_device(&mousedev->handle);

	mousedev_table[minor] = mousedev;

	cdev = class_device_create(&input_class, &dev->cdev,
	MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor),
	dev->cdev.dev, mousedev->name);

	/* temporary symlink to keep userspace happy */
	sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj,
	mousedev->name);

	return &mousedev->handle;
	}

	static void mousedev_disconnect(struct input_handle *handle)
	{
	struct mousedev *mousedev = handle->private;
	struct mousedev_list *list;

	sysfs_remove_link(&input_class.subsys.kset.kobj, mousedev->name);
	class_device_destroy(&input_class,
	MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + mousedev->minor));
	mousedev->exist = 0;

	if (mousedev->open) {
	input_close_device(handle);
	wake_up_interruptible(&mousedev->wait);
	list_for_each_entry(list, &mousedev->list, node)
	kill_fasync(&list->fasync, SIGIO, POLL_HUP);
	} else {
	if (mousedev_mix.open)
	input_close_device(handle);
	mousedev_free(mousedev);
	}
	}

	static struct input_device_id mousedev_ids[] = {
	{
	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_KEYBIT \| INPUT_DEVICE_ID_MATCH_RELBIT,
	.evbit = { BIT(EV_KEY) \| BIT(EV_REL) },
	.keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) },
	.relbit = { BIT(REL_X) \| BIT(REL_Y) },
	}, /* A mouse like device, at least one button, two relative axes */
	{
	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_RELBIT,
	.evbit = { BIT(EV_KEY) \| BIT(EV_REL) },
	.relbit = { BIT(REL_WHEEL) },
	}, /* A separate scrollwheel */
	{
	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_KEYBIT \| INPUT_DEVICE_ID_MATCH_ABSBIT,
	.evbit = { BIT(EV_KEY) \| BIT(EV_ABS) },
	.keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
	.absbit = { BIT(ABS_X) \| BIT(ABS_Y) },
	}, /* A tablet like device, at least touch detection, two absolute axes */
	{
	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_KEYBIT \| INPUT_DEVICE_ID_MATCH_ABSBIT,
	.evbit = { BIT(EV_KEY) \| BIT(EV_ABS) },
	.keybit = { [LONG(BTN_TOOL_FINGER)] = BIT(BTN_TOOL_FINGER) },
	.absbit = { BIT(ABS_X) \| BIT(ABS_Y) \| BIT(ABS_PRESSURE) \| BIT(ABS_TOOL_WIDTH) },
	}, /* A touchpad */

	{ }, /* Terminating entry */
	};

	MODULE_DEVICE_TABLE(input, mousedev_ids);

	static struct input_handler mousedev_handler = {
	.event = mousedev_event,
	.connect = mousedev_connect,
	.disconnect = mousedev_disconnect,
	.fops = &mousedev_fops,
	.minor = MOUSEDEV_MINOR_BASE,
	.name = "mousedev",
	.id_table = mousedev_ids,
	};

	#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
	static struct miscdevice psaux_mouse = {
	PSMOUSE_MINOR, "psaux", &mousedev_fops
	};
	static int psaux_registered;
	#endif

	static int __init mousedev_init(void)
	{
	input_register_handler(&mousedev_handler);

	memset(&mousedev_mix, 0, sizeof(struct mousedev));
	INIT_LIST_HEAD(&mousedev_mix.list);
	init_waitqueue_head(&mousedev_mix.wait);
	mousedev_table[MOUSEDEV_MIX] = &mousedev_mix;
	mousedev_mix.exist = 1;
	mousedev_mix.minor = MOUSEDEV_MIX;

	class_device_create(&input_class, NULL,
	MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX), NULL, "mice");

	#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
	if (!(psaux_registered = !misc_register(&psaux_mouse)))
	printk(KERN_WARNING "mice: could not misc_register the device\n");
	#endif

	printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");

	return 0;
	}

	static void __exit mousedev_exit(void)
	{
	#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
	if (psaux_registered)
	misc_deregister(&psaux_mouse);
	#endif
	class_device_destroy(&input_class,
	MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX));
	input_unregister_handler(&mousedev_handler);
	}

	module_init(mousedev_init);
	module_exit(mousedev_exit);