drivers/input/joydev.c - linux/kernel/git/mellanox/linux - Git at Google

 /*
  * Joystick device driver for the input driver suite.
  *
  * Copyright (c) 1999-2002 Vojtech Pavlik
  * Copyright (c) 1999 Colin Van Dyke
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  */

 #include <asm/io.h>
 #include <asm/system.h>
 #include <linux/delay.h>
 #include <linux/errno.h>
 #include <linux/joystick.h>
 #include <linux/input.h>
 #include <linux/kernel.h>
 #include <linux/major.h>
 #include <linux/slab.h>
 #include <linux/mm.h>
 #include <linux/miscdevice.h>
 #include <linux/module.h>
 #include <linux/poll.h>
 #include <linux/init.h>
 #include <linux/device.h>

 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
 MODULE_DESCRIPTION("Joystick device interfaces");
 MODULE_SUPPORTED_DEVICE("input/js");
 MODULE_LICENSE("GPL");

 #define JOYDEV_MINOR_BASE	0
 #define JOYDEV_MINORS		16
 #define JOYDEV_BUFFER_SIZE	64

 struct joydev {
 	int exist;
 	int open;
 	int minor;
 	char name[16];
 	struct input_handle handle;
 	wait_queue_head_t wait;
 	struct list_head client_list;
 	struct device dev;

 	struct js_corr corr[ABS_MAX + 1];
 	struct JS_DATA_SAVE_TYPE glue;
 	int nabs;
 	int nkey;
 	__u16 keymap[KEY_MAX - BTN_MISC + 1];
 	__u16 keypam[KEY_MAX - BTN_MISC + 1];
 	__u8 absmap[ABS_MAX + 1];
 	__u8 abspam[ABS_MAX + 1];
 	__s16 abs[ABS_MAX + 1];
 };

 struct joydev_client {
 	struct js_event buffer[JOYDEV_BUFFER_SIZE];
 	int head;
 	int tail;
 	int startup;
 	struct fasync_struct *fasync;
 	struct joydev *joydev;
 	struct list_head node;
 };

 static struct joydev *joydev_table[JOYDEV_MINORS];

 static int joydev_correct(int value, struct js_corr *corr)
 {
 	switch (corr->type) {
 		case JS_CORR_NONE:
 			break;
 		case JS_CORR_BROKEN:
 			value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
 				((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
 				((corr->coef[2] * (value - corr->coef[0])) >> 14);
 			break;
 		default:
 			return 0;
 	}

 	return value < -32767 ? -32767 : (value > 32767 ? 32767 : value);
 }

 static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
 {
 	struct joydev *joydev = handle->private;
 	struct joydev_client *client;
 	struct js_event event;

 	switch (type) {

 		case EV_KEY:
 			if (code < BTN_MISC || value == 2)
 				return;
 			event.type = JS_EVENT_BUTTON;
 			event.number = joydev->keymap[code - BTN_MISC];
 			event.value = value;
 			break;

 		case EV_ABS:
 			event.type = JS_EVENT_AXIS;
 			event.number = joydev->absmap[code];
 			event.value = joydev_correct(value, joydev->corr + event.number);
 			if (event.value == joydev->abs[event.number])
 				return;
 			joydev->abs[event.number] = event.value;
 			break;

 		default:
 			return;
 	}

 	event.time = jiffies_to_msecs(jiffies);

 	list_for_each_entry(client, &joydev->client_list, node) {

 		memcpy(client->buffer + client->head, &event, sizeof(struct js_event));

 		if (client->startup == joydev->nabs + joydev->nkey)
 			if (client->tail == (client->head = (client->head + 1) & (JOYDEV_BUFFER_SIZE - 1)))
 				client->startup = 0;

 		kill_fasync(&client->fasync, SIGIO, POLL_IN);
 	}

 	wake_up_interruptible(&joydev->wait);
 }

 static int joydev_fasync(int fd, struct file *file, int on)
 {
 	int retval;
 	struct joydev_client *client = file->private_data;

 	retval = fasync_helper(fd, file, on, &client->fasync);

 	return retval < 0 ? retval : 0;
 }

 static void joydev_free(struct device *dev)
 {
 	struct joydev *joydev = container_of(dev, struct joydev, dev);

 	joydev_table[joydev->minor] = NULL;
 	kfree(joydev);
 }

 static int joydev_release(struct inode *inode, struct file *file)
 {
 	struct joydev_client *client = file->private_data;
 	struct joydev *joydev = client->joydev;

 	joydev_fasync(-1, file, 0);

 	list_del(&client->node);
 	kfree(client);

 	if (!--joydev->open && joydev->exist)
 		input_close_device(&joydev->handle);

 	put_device(&joydev->dev);

 	return 0;
 }

 static int joydev_open(struct inode *inode, struct file *file)
 {
 	struct joydev_client *client;
 	struct joydev *joydev;
 	int i = iminor(inode) - JOYDEV_MINOR_BASE;
 	int error;

 	if (i >= JOYDEV_MINORS)
 		return -ENODEV;

 	joydev = joydev_table[i];
 	if (!joydev || !joydev->exist)
 		return -ENODEV;

 	get_device(&joydev->dev);

 	client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
 	if (!client) {
 		error = -ENOMEM;
 		goto err_put_joydev;
 	}

 	client->joydev = joydev;
 	list_add_tail(&client->node, &joydev->client_list);

 	if (!joydev->open++ && joydev->exist) {
 		error = input_open_device(&joydev->handle);
 		if (error)
 			goto err_free_client;
 	}

 	file->private_data = client;
 	return 0;

  err_free_client:
 	list_del(&client->node);
 	kfree(client);
  err_put_joydev:
 	put_device(&joydev->dev);
 	return error;
 }

 static ssize_t joydev_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 {
 	return -EINVAL;
 }

 static ssize_t joydev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 {
 	struct joydev_client *client = file->private_data;
 	struct joydev *joydev = client->joydev;
 	struct input_dev *input = joydev->handle.dev;
 	int retval = 0;

 	if (!joydev->exist)
 		return -ENODEV;

 	if (count < sizeof(struct js_event))
 		return -EINVAL;

 	if (count == sizeof(struct JS_DATA_TYPE)) {

 		struct JS_DATA_TYPE data;
 		int i;

 		for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
 			data.buttons |= test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
 		data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
 		data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;

 		if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
 			return -EFAULT;

 		client->startup = 0;
 		client->tail = client->head;

 		return sizeof(struct JS_DATA_TYPE);
 	}

 	if (client->startup == joydev->nabs + joydev->nkey &&
 	    client->head == client->tail && (file->f_flags & O_NONBLOCK))
 		return -EAGAIN;

 	retval = wait_event_interruptible(joydev->wait,
 					  !joydev->exist ||
 					  client->startup < joydev->nabs + joydev->nkey ||
 					  client->head != client->tail);
 	if (retval)
 		return retval;

 	if (!joydev->exist)
 		return -ENODEV;

 	while (client->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) {

 		struct js_event event;

 		event.time = jiffies_to_msecs(jiffies);

 		if (client->startup < joydev->nkey) {
 			event.type = JS_EVENT_BUTTON | JS_EVENT_INIT;
 			event.number = client->startup;
 			event.value = !!test_bit(joydev->keypam[event.number], input->key);
 		} else {
 			event.type = JS_EVENT_AXIS | JS_EVENT_INIT;
 			event.number = client->startup - joydev->nkey;
 			event.value = joydev->abs[event.number];
 		}

 		if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
 			return -EFAULT;

 		client->startup++;
 		retval += sizeof(struct js_event);
 	}

 	while (client->head != client->tail && retval + sizeof(struct js_event) <= count) {

 		if (copy_to_user(buf + retval, client->buffer + client->tail, sizeof(struct js_event)))
 			return -EFAULT;

 		client->tail = (client->tail + 1) & (JOYDEV_BUFFER_SIZE - 1);
 		retval += sizeof(struct js_event);
 	}

 	return retval;
 }

 /* No kernel lock - fine */
 static unsigned int joydev_poll(struct file *file, poll_table *wait)
 {
 	struct joydev_client *client = file->private_data;
 	struct joydev *joydev = client->joydev;

 	poll_wait(file, &joydev->wait, wait);
 	return ((client->head != client->tail || client->startup < joydev->nabs + joydev->nkey) ?
 		(POLLIN | POLLRDNORM) : 0) | (joydev->exist ? 0 : (POLLHUP | POLLERR));
 }

 static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __user *argp)
 {
 	struct input_dev *dev = joydev->handle.dev;
 	int i, j;

 	switch (cmd) {

 		case JS_SET_CAL:
 			return copy_from_user(&joydev->glue.JS_CORR, argp,
 				sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;

 		case JS_GET_CAL:
 			return copy_to_user(argp, &joydev->glue.JS_CORR,
 				sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;

 		case JS_SET_TIMEOUT:
 			return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);

 		case JS_GET_TIMEOUT:
 			return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);

 		case JSIOCGVERSION:
 			return put_user(JS_VERSION, (__u32 __user *) argp);

 		case JSIOCGAXES:
 			return put_user(joydev->nabs, (__u8 __user *) argp);

 		case JSIOCGBUTTONS:
 			return put_user(joydev->nkey, (__u8 __user *) argp);

 		case JSIOCSCORR:
 			if (copy_from_user(joydev->corr, argp,
 				      sizeof(joydev->corr[0]) * joydev->nabs))
 			    return -EFAULT;
 			for (i = 0; i < joydev->nabs; i++) {
 				j = joydev->abspam[i];
 			        joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
 			}
 			return 0;

 		case JSIOCGCORR:
 			return copy_to_user(argp, joydev->corr,
 						sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;

 		case JSIOCSAXMAP:
 			if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1)))
 				return -EFAULT;
 			for (i = 0; i < joydev->nabs; i++) {
 				if (joydev->abspam[i] > ABS_MAX)
 					return -EINVAL;
 				joydev->absmap[joydev->abspam[i]] = i;
 			}
 			return 0;

 		case JSIOCGAXMAP:
 			return copy_to_user(argp, joydev->abspam,
 						sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0;

 		case JSIOCSBTNMAP:
 			if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)))
 				return -EFAULT;
 			for (i = 0; i < joydev->nkey; i++) {
 				if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC)
 					return -EINVAL;
 				joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
 			}
 			return 0;

 		case JSIOCGBTNMAP:
 			return copy_to_user(argp, joydev->keypam,
 						sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0;

 		default:
 			if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
 				int len;
 				if (!dev->name)
 					return 0;
 				len = strlen(dev->name) + 1;
 				if (len > _IOC_SIZE(cmd))
 					len = _IOC_SIZE(cmd);
 				if (copy_to_user(argp, dev->name, len))
 					return -EFAULT;
 				return len;
 			}
 	}
 	return -EINVAL;
 }

 #ifdef CONFIG_COMPAT
 static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
 	struct joydev_client *client = file->private_data;
 	struct joydev *joydev = client->joydev;
 	void __user *argp = (void __user *)arg;
 	s32 tmp32;
 	struct JS_DATA_SAVE_TYPE_32 ds32;
 	int err;

 	if (!joydev->exist)
 		return -ENODEV;

 	switch(cmd) {
 	case JS_SET_TIMELIMIT:
 		err = get_user(tmp32, (s32 __user *) arg);
 		if (err == 0)
 			joydev->glue.JS_TIMELIMIT = tmp32;
 		break;
 	case JS_GET_TIMELIMIT:
 		tmp32 = joydev->glue.JS_TIMELIMIT;
 		err = put_user(tmp32, (s32 __user *) arg);
 		break;

 	case JS_SET_ALL:
 		err = copy_from_user(&ds32, argp,
 				     sizeof(ds32)) ? -EFAULT : 0;
 		if (err == 0) {
 			joydev->glue.JS_TIMEOUT    = ds32.JS_TIMEOUT;
 			joydev->glue.BUSY          = ds32.BUSY;
 			joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
 			joydev->glue.JS_TIMELIMIT  = ds32.JS_TIMELIMIT;
 			joydev->glue.JS_SAVE       = ds32.JS_SAVE;
 			joydev->glue.JS_CORR       = ds32.JS_CORR;
 		}
 		break;

 	case JS_GET_ALL:
 		ds32.JS_TIMEOUT    = joydev->glue.JS_TIMEOUT;
 		ds32.BUSY          = joydev->glue.BUSY;
 		ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
 		ds32.JS_TIMELIMIT  = joydev->glue.JS_TIMELIMIT;
 		ds32.JS_SAVE       = joydev->glue.JS_SAVE;
 		ds32.JS_CORR       = joydev->glue.JS_CORR;

 		err = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
 		break;

 	default:
 		err = joydev_ioctl_common(joydev, cmd, argp);
 	}
 	return err;
 }
 #endif /* CONFIG_COMPAT */

 static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 {
 	struct joydev_client *client = file->private_data;
 	struct joydev *joydev = client->joydev;
 	void __user *argp = (void __user *)arg;

 	if (!joydev->exist)
 		return -ENODEV;

 	switch(cmd) {
 		case JS_SET_TIMELIMIT:
 			return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
 		case JS_GET_TIMELIMIT:
 			return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
 		case JS_SET_ALL:
 			return copy_from_user(&joydev->glue, argp,
 						sizeof(joydev->glue)) ? -EFAULT : 0;
 		case JS_GET_ALL:
 			return copy_to_user(argp, &joydev->glue,
 						sizeof(joydev->glue)) ? -EFAULT : 0;
 		default:
 			return joydev_ioctl_common(joydev, cmd, argp);
 	}
 }

 static const struct file_operations joydev_fops = {
 	.owner =	THIS_MODULE,
 	.read =		joydev_read,
 	.write =	joydev_write,
 	.poll =		joydev_poll,
 	.open =		joydev_open,
 	.release =	joydev_release,
 	.ioctl =	joydev_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl =	joydev_compat_ioctl,
 #endif
 	.fasync =	joydev_fasync,
 };

 static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
 			  const struct input_device_id *id)
 {
 	struct joydev *joydev;
 	int i, j, t, minor;
 	int error;

 	for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++);
 	if (minor == JOYDEV_MINORS) {
 		printk(KERN_ERR "joydev: no more free joydev devices\n");
 		return -ENFILE;
 	}

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

 	INIT_LIST_HEAD(&joydev->client_list);
 	init_waitqueue_head(&joydev->wait);

 	joydev->minor = minor;
 	joydev->exist = 1;
 	joydev->handle.dev = dev;
 	joydev->handle.name = joydev->name;
 	joydev->handle.handler = handler;
 	joydev->handle.private = joydev;
 	snprintf(joydev->name, sizeof(joydev->name), "js%d", minor);

 	for (i = 0; i < ABS_MAX + 1; i++)
 		if (test_bit(i, dev->absbit)) {
 			joydev->absmap[i] = joydev->nabs;
 			joydev->abspam[joydev->nabs] = i;
 			joydev->nabs++;
 		}

 	for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
 		if (test_bit(i + BTN_MISC, dev->keybit)) {
 			joydev->keymap[i] = joydev->nkey;
 			joydev->keypam[joydev->nkey] = i + BTN_MISC;
 			joydev->nkey++;
 		}

 	for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
 		if (test_bit(i + BTN_MISC, dev->keybit)) {
 			joydev->keymap[i] = joydev->nkey;
 			joydev->keypam[joydev->nkey] = i + BTN_MISC;
 			joydev->nkey++;
 		}

 	for (i = 0; i < joydev->nabs; i++) {
 		j = joydev->abspam[i];
 		if (dev->absmax[j] == dev->absmin[j]) {
 			joydev->corr[i].type = JS_CORR_NONE;
 			joydev->abs[i] = dev->abs[j];
 			continue;
 		}
 		joydev->corr[i].type = JS_CORR_BROKEN;
 		joydev->corr[i].prec = dev->absfuzz[j];
 		joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
 		joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
 		if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j])))
 			continue;
 		joydev->corr[i].coef[2] = (1 << 29) / t;
 		joydev->corr[i].coef[3] = (1 << 29) / t;

 		joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
 	}

 	snprintf(joydev->dev.bus_id, sizeof(joydev->dev.bus_id),
 		 "js%d", minor);
 	joydev->dev.class = &input_class;
 	joydev->dev.parent = &dev->dev;
 	joydev->dev.devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor);
 	joydev->dev.release = joydev_free;
 	device_initialize(&joydev->dev);

 	joydev_table[minor] = joydev;

 	error = device_add(&joydev->dev);
 	if (error)
 		goto err_free_joydev;

 	error = input_register_handle(&joydev->handle);
 	if (error)
 		goto err_delete_joydev;

 	return 0;

  err_delete_joydev:
 	device_del(&joydev->dev);
  err_free_joydev:
 	put_device(&joydev->dev);
 	return error;
 }


 static void joydev_disconnect(struct input_handle *handle)
 {
 	struct joydev *joydev = handle->private;
 	struct joydev_client *client;

 	input_unregister_handle(handle);
 	device_del(&joydev->dev);

 	joydev->exist = 0;

 	if (joydev->open) {
 		input_close_device(handle);
 		list_for_each_entry(client, &joydev->client_list, node)
 			kill_fasync(&client->fasync, SIGIO, POLL_HUP);
 		wake_up_interruptible(&joydev->wait);
 	}

 	put_device(&joydev->dev);
 }

 static const struct input_device_id joydev_blacklist[] = {
 	{
 		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
 		.evbit = { BIT(EV_KEY) },
 		.keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
 	},	/* Avoid itouchpads, touchscreens and tablets */
 	{ }	/* Terminating entry */
 };

 static const struct input_device_id joydev_ids[] = {
 	{
 		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 		.evbit = { BIT(EV_ABS) },
 		.absbit = { BIT(ABS_X) },
 	},
 	{
 		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 		.evbit = { BIT(EV_ABS) },
 		.absbit = { BIT(ABS_WHEEL) },
 	},
 	{
 		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 		.evbit = { BIT(EV_ABS) },
 		.absbit = { BIT(ABS_THROTTLE) },
 	},
 	{ }	/* Terminating entry */
 };

 MODULE_DEVICE_TABLE(input, joydev_ids);

 static struct input_handler joydev_handler = {
 	.event =	joydev_event,
 	.connect =	joydev_connect,
 	.disconnect =	joydev_disconnect,
 	.fops =		&joydev_fops,
 	.minor =	JOYDEV_MINOR_BASE,
 	.name =		"joydev",
 	.id_table =	joydev_ids,
 	.blacklist =	joydev_blacklist,
 };

 static int __init joydev_init(void)
 {
 	return input_register_handler(&joydev_handler);
 }

 static void __exit joydev_exit(void)
 {
 	input_unregister_handler(&joydev_handler);
 }

 module_init(joydev_init);
 module_exit(joydev_exit);
	/*
	* Joystick device driver for the input driver suite.
	*
	* Copyright (c) 1999-2002 Vojtech Pavlik
	* Copyright (c) 1999 Colin Van Dyke
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*/

	#include <asm/io.h>
	#include <asm/system.h>
	#include <linux/delay.h>
	#include <linux/errno.h>
	#include <linux/joystick.h>
	#include <linux/input.h>
	#include <linux/kernel.h>
	#include <linux/major.h>
	#include <linux/slab.h>
	#include <linux/mm.h>
	#include <linux/miscdevice.h>
	#include <linux/module.h>
	#include <linux/poll.h>
	#include <linux/init.h>
	#include <linux/device.h>

	MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
	MODULE_DESCRIPTION("Joystick device interfaces");
	MODULE_SUPPORTED_DEVICE("input/js");
	MODULE_LICENSE("GPL");

	#define JOYDEV_MINOR_BASE 0
	#define JOYDEV_MINORS 16
	#define JOYDEV_BUFFER_SIZE 64

	struct joydev {
	int exist;
	int open;
	int minor;
	char name[16];
	struct input_handle handle;
	wait_queue_head_t wait;
	struct list_head client_list;
	struct device dev;

	struct js_corr corr[ABS_MAX + 1];
	struct JS_DATA_SAVE_TYPE glue;
	int nabs;
	int nkey;
	__u16 keymap[KEY_MAX - BTN_MISC + 1];
	__u16 keypam[KEY_MAX - BTN_MISC + 1];
	__u8 absmap[ABS_MAX + 1];
	__u8 abspam[ABS_MAX + 1];
	__s16 abs[ABS_MAX + 1];
	};

	struct joydev_client {
	struct js_event buffer[JOYDEV_BUFFER_SIZE];
	int head;
	int tail;
	int startup;
	struct fasync_struct *fasync;
	struct joydev *joydev;
	struct list_head node;
	};

	static struct joydev *joydev_table[JOYDEV_MINORS];

	static int joydev_correct(int value, struct js_corr *corr)
	{
	switch (corr->type) {
	case JS_CORR_NONE:
	break;
	case JS_CORR_BROKEN:
	value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
	((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
	((corr->coef[2] * (value - corr->coef[0])) >> 14);
	break;
	default:
	return 0;
	}

	return value < -32767 ? -32767 : (value > 32767 ? 32767 : value);
	}

	static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
	{
	struct joydev *joydev = handle->private;
	struct joydev_client *client;
	struct js_event event;

	switch (type) {

	case EV_KEY:
	if (code < BTN_MISC \|\| value == 2)
	return;
	event.type = JS_EVENT_BUTTON;
	event.number = joydev->keymap[code - BTN_MISC];
	event.value = value;
	break;

	case EV_ABS:
	event.type = JS_EVENT_AXIS;
	event.number = joydev->absmap[code];
	event.value = joydev_correct(value, joydev->corr + event.number);
	if (event.value == joydev->abs[event.number])
	return;
	joydev->abs[event.number] = event.value;
	break;

	default:
	return;
	}

	event.time = jiffies_to_msecs(jiffies);

	list_for_each_entry(client, &joydev->client_list, node) {

	memcpy(client->buffer + client->head, &event, sizeof(struct js_event));

	if (client->startup == joydev->nabs + joydev->nkey)
	if (client->tail == (client->head = (client->head + 1) & (JOYDEV_BUFFER_SIZE - 1)))
	client->startup = 0;

	kill_fasync(&client->fasync, SIGIO, POLL_IN);
	}

	wake_up_interruptible(&joydev->wait);
	}

	static int joydev_fasync(int fd, struct file *file, int on)
	{
	int retval;
	struct joydev_client *client = file->private_data;

	retval = fasync_helper(fd, file, on, &client->fasync);

	return retval < 0 ? retval : 0;
	}

	static void joydev_free(struct device *dev)
	{
	struct joydev *joydev = container_of(dev, struct joydev, dev);

	joydev_table[joydev->minor] = NULL;
	kfree(joydev);
	}

	static int joydev_release(struct inode inode, struct file file)
	{
	struct joydev_client *client = file->private_data;
	struct joydev *joydev = client->joydev;

	joydev_fasync(-1, file, 0);

	list_del(&client->node);
	kfree(client);

	if (!--joydev->open && joydev->exist)
	input_close_device(&joydev->handle);

	put_device(&joydev->dev);

	return 0;
	}

	static int joydev_open(struct inode inode, struct file file)
	{
	struct joydev_client *client;
	struct joydev *joydev;
	int i = iminor(inode) - JOYDEV_MINOR_BASE;
	int error;

	if (i >= JOYDEV_MINORS)
	return -ENODEV;

	joydev = joydev_table[i];
	if (!joydev \|\| !joydev->exist)
	return -ENODEV;

	get_device(&joydev->dev);

	client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
	if (!client) {
	error = -ENOMEM;
	goto err_put_joydev;
	}

	client->joydev = joydev;
	list_add_tail(&client->node, &joydev->client_list);

	if (!joydev->open++ && joydev->exist) {
	error = input_open_device(&joydev->handle);
	if (error)
	goto err_free_client;
	}

	file->private_data = client;
	return 0;

	err_free_client:
	list_del(&client->node);
	kfree(client);
	err_put_joydev:
	put_device(&joydev->dev);
	return error;
	}

	static ssize_t joydev_write(struct file file, const char __user buffer, size_t count, loff_t *ppos)
	{
	return -EINVAL;
	}

	static ssize_t joydev_read(struct file file, char __user buf, size_t count, loff_t *ppos)
	{
	struct joydev_client *client = file->private_data;
	struct joydev *joydev = client->joydev;
	struct input_dev *input = joydev->handle.dev;
	int retval = 0;

	if (!joydev->exist)
	return -ENODEV;

	if (count < sizeof(struct js_event))
	return -EINVAL;

	if (count == sizeof(struct JS_DATA_TYPE)) {

	struct JS_DATA_TYPE data;
	int i;

	for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
	data.buttons \|= test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
	data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
	data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;

	if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
	return -EFAULT;

	client->startup = 0;
	client->tail = client->head;

	return sizeof(struct JS_DATA_TYPE);
	}

	if (client->startup == joydev->nabs + joydev->nkey &&
	client->head == client->tail && (file->f_flags & O_NONBLOCK))
	return -EAGAIN;

	retval = wait_event_interruptible(joydev->wait,
	!joydev->exist \|\|
	client->startup < joydev->nabs + joydev->nkey \|\|
	client->head != client->tail);
	if (retval)
	return retval;

	if (!joydev->exist)
	return -ENODEV;

	while (client->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) {

	struct js_event event;

	event.time = jiffies_to_msecs(jiffies);

	if (client->startup < joydev->nkey) {
	event.type = JS_EVENT_BUTTON \| JS_EVENT_INIT;
	event.number = client->startup;
	event.value = !!test_bit(joydev->keypam[event.number], input->key);
	} else {
	event.type = JS_EVENT_AXIS \| JS_EVENT_INIT;
	event.number = client->startup - joydev->nkey;
	event.value = joydev->abs[event.number];
	}

	if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
	return -EFAULT;

	client->startup++;
	retval += sizeof(struct js_event);
	}

	while (client->head != client->tail && retval + sizeof(struct js_event) <= count) {

	if (copy_to_user(buf + retval, client->buffer + client->tail, sizeof(struct js_event)))
	return -EFAULT;

	client->tail = (client->tail + 1) & (JOYDEV_BUFFER_SIZE - 1);
	retval += sizeof(struct js_event);
	}

	return retval;
	}

	/* No kernel lock - fine */
	static unsigned int joydev_poll(struct file file, poll_table wait)
	{
	struct joydev_client *client = file->private_data;
	struct joydev *joydev = client->joydev;

	poll_wait(file, &joydev->wait, wait);
	return ((client->head != client->tail \|\| client->startup < joydev->nabs + joydev->nkey) ?
	(POLLIN \| POLLRDNORM) : 0) \| (joydev->exist ? 0 : (POLLHUP \| POLLERR));
	}

	static int joydev_ioctl_common(struct joydev joydev, unsigned int cmd, void __user argp)
	{
	struct input_dev *dev = joydev->handle.dev;
	int i, j;

	switch (cmd) {

	case JS_SET_CAL:
	return copy_from_user(&joydev->glue.JS_CORR, argp,
	sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;

	case JS_GET_CAL:
	return copy_to_user(argp, &joydev->glue.JS_CORR,
	sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;

	case JS_SET_TIMEOUT:
	return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);

	case JS_GET_TIMEOUT:
	return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);

	case JSIOCGVERSION:
	return put_user(JS_VERSION, (__u32 __user *) argp);

	case JSIOCGAXES:
	return put_user(joydev->nabs, (__u8 __user *) argp);

	case JSIOCGBUTTONS:
	return put_user(joydev->nkey, (__u8 __user *) argp);

	case JSIOCSCORR:
	if (copy_from_user(joydev->corr, argp,
	sizeof(joydev->corr[0]) * joydev->nabs))
	return -EFAULT;
	for (i = 0; i < joydev->nabs; i++) {
	j = joydev->abspam[i];
	joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
	}
	return 0;

	case JSIOCGCORR:
	return copy_to_user(argp, joydev->corr,
	sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;

	case JSIOCSAXMAP:
	if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1)))
	return -EFAULT;
	for (i = 0; i < joydev->nabs; i++) {
	if (joydev->abspam[i] > ABS_MAX)
	return -EINVAL;
	joydev->absmap[joydev->abspam[i]] = i;
	}
	return 0;

	case JSIOCGAXMAP:
	return copy_to_user(argp, joydev->abspam,
	sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0;

	case JSIOCSBTNMAP:
	if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)))
	return -EFAULT;
	for (i = 0; i < joydev->nkey; i++) {
	if (joydev->keypam[i] > KEY_MAX \|\| joydev->keypam[i] < BTN_MISC)
	return -EINVAL;
	joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
	}
	return 0;

	case JSIOCGBTNMAP:
	return copy_to_user(argp, joydev->keypam,
	sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0;

	default:
	if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
	int len;
	if (!dev->name)
	return 0;
	len = strlen(dev->name) + 1;
	if (len > _IOC_SIZE(cmd))
	len = _IOC_SIZE(cmd);
	if (copy_to_user(argp, dev->name, len))
	return -EFAULT;
	return len;
	}
	}
	return -EINVAL;
	}

	#ifdef CONFIG_COMPAT
	static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	{
	struct joydev_client *client = file->private_data;
	struct joydev *joydev = client->joydev;
	void __user argp = (void __user )arg;
	s32 tmp32;
	struct JS_DATA_SAVE_TYPE_32 ds32;
	int err;

	if (!joydev->exist)
	return -ENODEV;

	switch(cmd) {
	case JS_SET_TIMELIMIT:
	err = get_user(tmp32, (s32 __user *) arg);
	if (err == 0)
	joydev->glue.JS_TIMELIMIT = tmp32;
	break;
	case JS_GET_TIMELIMIT:
	tmp32 = joydev->glue.JS_TIMELIMIT;
	err = put_user(tmp32, (s32 __user *) arg);
	break;

	case JS_SET_ALL:
	err = copy_from_user(&ds32, argp,
	sizeof(ds32)) ? -EFAULT : 0;
	if (err == 0) {
	joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT;
	joydev->glue.BUSY = ds32.BUSY;
	joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
	joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT;
	joydev->glue.JS_SAVE = ds32.JS_SAVE;
	joydev->glue.JS_CORR = ds32.JS_CORR;
	}
	break;

	case JS_GET_ALL:
	ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT;
	ds32.BUSY = joydev->glue.BUSY;
	ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
	ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT;
	ds32.JS_SAVE = joydev->glue.JS_SAVE;
	ds32.JS_CORR = joydev->glue.JS_CORR;

	err = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
	break;

	default:
	err = joydev_ioctl_common(joydev, cmd, argp);
	}
	return err;
	}
	#endif /* CONFIG_COMPAT */

	static int joydev_ioctl(struct inode inode, struct file file, unsigned int cmd, unsigned long arg)
	{
	struct joydev_client *client = file->private_data;
	struct joydev *joydev = client->joydev;
	void __user argp = (void __user )arg;

	if (!joydev->exist)
	return -ENODEV;

	switch(cmd) {
	case JS_SET_TIMELIMIT:
	return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
	case JS_GET_TIMELIMIT:
	return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
	case JS_SET_ALL:
	return copy_from_user(&joydev->glue, argp,
	sizeof(joydev->glue)) ? -EFAULT : 0;
	case JS_GET_ALL:
	return copy_to_user(argp, &joydev->glue,
	sizeof(joydev->glue)) ? -EFAULT : 0;
	default:
	return joydev_ioctl_common(joydev, cmd, argp);
	}
	}

	static const struct file_operations joydev_fops = {
	.owner = THIS_MODULE,
	.read = joydev_read,
	.write = joydev_write,
	.poll = joydev_poll,
	.open = joydev_open,
	.release = joydev_release,
	.ioctl = joydev_ioctl,
	#ifdef CONFIG_COMPAT
	.compat_ioctl = joydev_compat_ioctl,
	#endif
	.fasync = joydev_fasync,
	};

	static int joydev_connect(struct input_handler handler, struct input_dev dev,
	const struct input_device_id *id)
	{
	struct joydev *joydev;
	int i, j, t, minor;
	int error;

	for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++);
	if (minor == JOYDEV_MINORS) {
	printk(KERN_ERR "joydev: no more free joydev devices\n");
	return -ENFILE;
	}

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

	INIT_LIST_HEAD(&joydev->client_list);
	init_waitqueue_head(&joydev->wait);

	joydev->minor = minor;
	joydev->exist = 1;
	joydev->handle.dev = dev;
	joydev->handle.name = joydev->name;
	joydev->handle.handler = handler;
	joydev->handle.private = joydev;
	snprintf(joydev->name, sizeof(joydev->name), "js%d", minor);

	for (i = 0; i < ABS_MAX + 1; i++)
	if (test_bit(i, dev->absbit)) {
	joydev->absmap[i] = joydev->nabs;
	joydev->abspam[joydev->nabs] = i;
	joydev->nabs++;
	}

	for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
	if (test_bit(i + BTN_MISC, dev->keybit)) {
	joydev->keymap[i] = joydev->nkey;
	joydev->keypam[joydev->nkey] = i + BTN_MISC;
	joydev->nkey++;
	}

	for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
	if (test_bit(i + BTN_MISC, dev->keybit)) {
	joydev->keymap[i] = joydev->nkey;
	joydev->keypam[joydev->nkey] = i + BTN_MISC;
	joydev->nkey++;
	}

	for (i = 0; i < joydev->nabs; i++) {
	j = joydev->abspam[i];
	if (dev->absmax[j] == dev->absmin[j]) {
	joydev->corr[i].type = JS_CORR_NONE;
	joydev->abs[i] = dev->abs[j];
	continue;
	}
	joydev->corr[i].type = JS_CORR_BROKEN;
	joydev->corr[i].prec = dev->absfuzz[j];
	joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
	joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
	if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j])))
	continue;
	joydev->corr[i].coef[2] = (1 << 29) / t;
	joydev->corr[i].coef[3] = (1 << 29) / t;

	joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
	}

	snprintf(joydev->dev.bus_id, sizeof(joydev->dev.bus_id),
	"js%d", minor);
	joydev->dev.class = &input_class;
	joydev->dev.parent = &dev->dev;
	joydev->dev.devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor);
	joydev->dev.release = joydev_free;
	device_initialize(&joydev->dev);

	joydev_table[minor] = joydev;

	error = device_add(&joydev->dev);
	if (error)
	goto err_free_joydev;

	error = input_register_handle(&joydev->handle);
	if (error)
	goto err_delete_joydev;

	return 0;

	err_delete_joydev:
	device_del(&joydev->dev);
	err_free_joydev:
	put_device(&joydev->dev);
	return error;
	}


	static void joydev_disconnect(struct input_handle *handle)
	{
	struct joydev *joydev = handle->private;
	struct joydev_client *client;

	input_unregister_handle(handle);
	device_del(&joydev->dev);

	joydev->exist = 0;

	if (joydev->open) {
	input_close_device(handle);
	list_for_each_entry(client, &joydev->client_list, node)
	kill_fasync(&client->fasync, SIGIO, POLL_HUP);
	wake_up_interruptible(&joydev->wait);
	}

	put_device(&joydev->dev);
	}

	static const struct input_device_id joydev_blacklist[] = {
	{
	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_KEYBIT,
	.evbit = { BIT(EV_KEY) },
	.keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
	}, /* Avoid itouchpads, touchscreens and tablets */
	{ } /* Terminating entry */
	};

	static const struct input_device_id joydev_ids[] = {
	{
	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_ABSBIT,
	.evbit = { BIT(EV_ABS) },
	.absbit = { BIT(ABS_X) },
	},
	{
	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_ABSBIT,
	.evbit = { BIT(EV_ABS) },
	.absbit = { BIT(ABS_WHEEL) },
	},
	{
	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_ABSBIT,
	.evbit = { BIT(EV_ABS) },
	.absbit = { BIT(ABS_THROTTLE) },
	},
	{ } /* Terminating entry */
	};

	MODULE_DEVICE_TABLE(input, joydev_ids);

	static struct input_handler joydev_handler = {
	.event = joydev_event,
	.connect = joydev_connect,
	.disconnect = joydev_disconnect,
	.fops = &joydev_fops,
	.minor = JOYDEV_MINOR_BASE,
	.name = "joydev",
	.id_table = joydev_ids,
	.blacklist = joydev_blacklist,
	};

	static int __init joydev_init(void)
	{
	return input_register_handler(&joydev_handler);
	}

	static void __exit joydev_exit(void)
	{
	input_unregister_handler(&joydev_handler);
	}

	module_init(joydev_init);
	module_exit(joydev_exit);