[net-next-2.6.git] / drivers / input / joydev.c

/*
 * 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/smp_lock.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 list;
	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_list {
	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;
	}

	if (value < -32767) return -32767;
	if (value >  32767) return  32767;

	return value;
}

static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
{
	struct joydev *joydev = handle->private;
	struct joydev_list *list;
	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(list, &joydev->list, node) {

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

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

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

	wake_up_interruptible(&joydev->wait);
}

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

static void joydev_free(struct joydev *joydev)
{
	joydev_table[joydev->minor] = NULL;
	kfree(joydev);
}

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

	joydev_fasync(-1, file, 0);

	list_del(&list->node);

	if (!--list->joydev->open) {
		if (list->joydev->exist)
			input_close_device(&list->joydev->handle);
		else
			joydev_free(list->joydev);
	}

	kfree(list);
	return 0;
}

static int joydev_open(struct inode *inode, struct file *file)
{
	struct joydev_list *list;
	int i = iminor(inode) - JOYDEV_MINOR_BASE;

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

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

	list->joydev = joydev_table[i];
	list_add_tail(&list->node, &joydev_table[i]->list);
	file->private_data = list;

	if (!list->joydev->open++)
		if (list->joydev->exist)
			input_open_device(&list->joydev->handle);

	return 0;
}

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_list *list = file->private_data;
	struct joydev *joydev = list->joydev;
	struct input_dev *input = joydev->handle.dev;
	int retval = 0;

	if (!list->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;

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

		return sizeof(struct JS_DATA_TYPE);
	}

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

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

	if (retval)
		return retval;

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

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

		struct js_event event;

		event.time = jiffies_to_msecs(jiffies);

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

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

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

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

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

		list->tail = (list->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_list *list = file->private_data;
	poll_wait(file, &list->joydev->wait, wait);
	return ((list->head != list->tail || list->startup < list->joydev->nabs + list->joydev->nkey) ? 
		(POLLIN | POLLRDNORM) : 0) | (list->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_list *list = file->private_data;
	struct joydev *joydev = list->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_list *list = file->private_data;
	struct joydev *joydev = list->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 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 struct input_handle *joydev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
{
	struct joydev *joydev;
	struct class_device *cdev;
	int i, j, t, minor;

	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 NULL;
	}

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

	INIT_LIST_HEAD(&joydev->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;
	sprintf(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);
	}

	joydev_table[minor] = joydev;

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

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

	return &joydev->handle;
}

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

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

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

static 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 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)
{
	input_register_handler(&joydev_handler);
	return 0;
}

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

module_init(joydev_init);
module_exit(joydev_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Joystick device driver for the input driver suite.
	3	*
	4	* Copyright (c) 1999-2002 Vojtech Pavlik
	5	* Copyright (c) 1999 Colin Van Dyke
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*/
	12
	13	#include <asm/io.h>
	14	#include <asm/system.h>
	15	#include <linux/delay.h>
	16	#include <linux/errno.h>
	17	#include <linux/joystick.h>
	18	#include <linux/input.h>
	19	#include <linux/kernel.h>
	20	#include <linux/major.h>
	21	#include <linux/slab.h>
	22	#include <linux/mm.h>
	23	#include <linux/miscdevice.h>
	24	#include <linux/module.h>
	25	#include <linux/poll.h>
	26	#include <linux/init.h>
	27	#include <linux/smp_lock.h>
	28	#include <linux/device.h>
1da177e4 LT	29
	30	MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
	31	MODULE_DESCRIPTION("Joystick device interfaces");
	32	MODULE_SUPPORTED_DEVICE("input/js");
	33	MODULE_LICENSE("GPL");
	34
	35	#define JOYDEV_MINOR_BASE 0
	36	#define JOYDEV_MINORS 16
	37	#define JOYDEV_BUFFER_SIZE 64
	38
1da177e4 LT	39	struct joydev {
	40	int exist;
	41	int open;
	42	int minor;
	43	char name[16];
	44	struct input_handle handle;
	45	wait_queue_head_t wait;
	46	struct list_head list;
	47	struct js_corr corr[ABS_MAX + 1];
	48	struct JS_DATA_SAVE_TYPE glue;
	49	int nabs;
	50	int nkey;
	51	__u16 keymap[KEY_MAX - BTN_MISC + 1];
	52	__u16 keypam[KEY_MAX - BTN_MISC + 1];
	53	__u8 absmap[ABS_MAX + 1];
	54	__u8 abspam[ABS_MAX + 1];
	55	__s16 abs[ABS_MAX + 1];
	56	};
	57
	58	struct joydev_list {
	59	struct js_event buffer[JOYDEV_BUFFER_SIZE];
	60	int head;
	61	int tail;
	62	int startup;
	63	struct fasync_struct *fasync;
	64	struct joydev *joydev;
	65	struct list_head node;
	66	};
	67
	68	static struct joydev *joydev_table[JOYDEV_MINORS];
	69
	70	static int joydev_correct(int value, struct js_corr *corr)
	71	{
	72	switch (corr->type) {
	73	case JS_CORR_NONE:
	74	break;
	75	case JS_CORR_BROKEN:
	76	value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
	77	((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
	78	((corr->coef[2] * (value - corr->coef[0])) >> 14);
	79	break;
	80	default:
	81	return 0;
	82	}
	83
	84	if (value < -32767) return -32767;
	85	if (value > 32767) return 32767;
	86
	87	return value;
	88	}
	89
	90	static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
	91	{
	92	struct joydev *joydev = handle->private;
	93	struct joydev_list *list;
	94	struct js_event event;
	95
	96	switch (type) {
	97
	98	case EV_KEY:
	99	if (code < BTN_MISC \|\| value == 2) return;
	100	event.type = JS_EVENT_BUTTON;
	101	event.number = joydev->keymap[code - BTN_MISC];
	102	event.value = value;
103	break;
104
105	case EV_ABS:
106	event.type = JS_EVENT_AXIS;
107	event.number = joydev->absmap[code];
108	event.value = joydev_correct(value, joydev->corr + event.number);
109	if (event.value == joydev->abs[event.number]) return;
110	joydev->abs[event.number] = event.value;
111	break;
112
113	default:
114	return;
115	}
116
6f5eacfc	117	event.time = jiffies_to_msecs(jiffies);
1da177e4 LT	118
	119	list_for_each_entry(list, &joydev->list, node) {
	120
	121	memcpy(list->buffer + list->head, &event, sizeof(struct js_event));
	122
	123	if (list->startup == joydev->nabs + joydev->nkey)
	124	if (list->tail == (list->head = (list->head + 1) & (JOYDEV_BUFFER_SIZE - 1)))
	125	list->startup = 0;
	126
	127	kill_fasync(&list->fasync, SIGIO, POLL_IN);
	128	}
	129
	130	wake_up_interruptible(&joydev->wait);
	131	}
	132
	133	static int joydev_fasync(int fd, struct file *file, int on)
	134	{
	135	int retval;
	136	struct joydev_list *list = file->private_data;
	137	retval = fasync_helper(fd, file, on, &list->fasync);
	138	return retval < 0 ? retval : 0;
	139	}
	140
	141	static void joydev_free(struct joydev *joydev)
	142	{
	143	joydev_table[joydev->minor] = NULL;
	144	kfree(joydev);
	145	}
	146
	147	static int joydev_release(struct inode * inode, struct file * file)
	148	{
	149	struct joydev_list *list = file->private_data;
	150
	151	joydev_fasync(-1, file, 0);
	152
	153	list_del(&list->node);
	154
	155	if (!--list->joydev->open) {
	156	if (list->joydev->exist)
	157	input_close_device(&list->joydev->handle);
	158	else
	159	joydev_free(list->joydev);
	160	}
	161
	162	kfree(list);
	163	return 0;
	164	}
	165
	166	static int joydev_open(struct inode inode, struct file file)
	167	{
	168	struct joydev_list *list;
	169	int i = iminor(inode) - JOYDEV_MINOR_BASE;
	170
	171	if (i >= JOYDEV_MINORS \|\| !joydev_table[i])
	172	return -ENODEV;
	173
b39787a9	174	if (!(list = kzalloc(sizeof(struct joydev_list), GFP_KERNEL)))
1da177e4	175	return -ENOMEM;
1da177e4 LT	176
	177	list->joydev = joydev_table[i];
	178	list_add_tail(&list->node, &joydev_table[i]->list);
	179	file->private_data = list;
	180
	181	if (!list->joydev->open++)
	182	if (list->joydev->exist)
	183	input_open_device(&list->joydev->handle);
	184
	185	return 0;
	186	}
	187
	188	static ssize_t joydev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
	189	{
	190	return -EINVAL;
	191	}
	192
	193	static ssize_t joydev_read(struct file file, char __user buf, size_t count, loff_t *ppos)
	194	{
	195	struct joydev_list *list = file->private_data;
	196	struct joydev *joydev = list->joydev;
	197	struct input_dev *input = joydev->handle.dev;
	198	int retval = 0;
	199
	200	if (!list->joydev->exist)
	201	return -ENODEV;
	202
	203	if (count < sizeof(struct js_event))
	204	return -EINVAL;
	205
	206	if (count == sizeof(struct JS_DATA_TYPE)) {
	207
	208	struct JS_DATA_TYPE data;
	209	int i;
	210
	211	for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
	212	data.buttons \|= test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
	213	data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
	214	data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
	215
	216	if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
	217	return -EFAULT;
	218
	219	list->startup = 0;
	220	list->tail = list->head;
	221
	222	return sizeof(struct JS_DATA_TYPE);
	223	}
	224
	225	if (list->startup == joydev->nabs + joydev->nkey
	226	&& list->head == list->tail && (file->f_flags & O_NONBLOCK))
	227	return -EAGAIN;
	228
	229	retval = wait_event_interruptible(list->joydev->wait,
	230	!list->joydev->exist \|\|
	231	list->startup < joydev->nabs + joydev->nkey \|\|
	232	list->head != list->tail);
	233
	234	if (retval)
	235	return retval;
	236
	237	if (!list->joydev->exist)
	238	return -ENODEV;
	239
240	while (list->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) {
241
242	struct js_event event;
243
6f5eacfc	244	event.time = jiffies_to_msecs(jiffies);
1da177e4 LT	245
	246	if (list->startup < joydev->nkey) {
	247	event.type = JS_EVENT_BUTTON \| JS_EVENT_INIT;
	248	event.number = list->startup;
	249	event.value = !!test_bit(joydev->keypam[event.number], input->key);
	250	} else {
	251	event.type = JS_EVENT_AXIS \| JS_EVENT_INIT;
	252	event.number = list->startup - joydev->nkey;
	253	event.value = joydev->abs[event.number];
	254	}
	255
	256	if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
	257	return -EFAULT;
	258
	259	list->startup++;
	260	retval += sizeof(struct js_event);
	261	}
	262
	263	while (list->head != list->tail && retval + sizeof(struct js_event) <= count) {
	264
	265	if (copy_to_user(buf + retval, list->buffer + list->tail, sizeof(struct js_event)))
	266	return -EFAULT;
	267
	268	list->tail = (list->tail + 1) & (JOYDEV_BUFFER_SIZE - 1);
	269	retval += sizeof(struct js_event);
	270	}
	271
	272	return retval;
	273	}
	274
	275	/* No kernel lock - fine */
	276	static unsigned int joydev_poll(struct file file, poll_table wait)
	277	{
	278	struct joydev_list *list = file->private_data;
	279	poll_wait(file, &list->joydev->wait, wait);
	280	return ((list->head != list->tail \|\| list->startup < list->joydev->nabs + list->joydev->nkey) ?
	281	(POLLIN \| POLLRDNORM) : 0) \| (list->joydev->exist ? 0 : (POLLHUP \| POLLERR));
	282	}
	283
024ac44c	284	static int joydev_ioctl_common(struct joydev joydev, unsigned int cmd, void __user argp)
1da177e4	285	{
1da177e4	286	struct input_dev *dev = joydev->handle.dev;
1da177e4 LT	287	int i, j;
1da177e4 LT	288
1da177e4 LT	289	switch (cmd) {
	290
	291	case JS_SET_CAL:
	292	return copy_from_user(&joydev->glue.JS_CORR, argp,
024ac44c	293	sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
1da177e4 LT	294	case JS_GET_CAL:
1da177e4 LT	295	return copy_to_user(argp, &joydev->glue.JS_CORR,
024ac44c	296	sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
1da177e4	297	case JS_SET_TIMEOUT:
024ac44c	298	return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
1da177e4	299	case JS_GET_TIMEOUT:
024ac44c	300	return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
1da177e4 LT	301
1da177e4 LT	302	case JSIOCGVERSION:
024ac44c	303	return put_user(JS_VERSION, (__u32 __user *) argp);
1da177e4	304	case JSIOCGAXES:
024ac44c	305	return put_user(joydev->nabs, (__u8 __user *) argp);
1da177e4	306	case JSIOCGBUTTONS:
024ac44c	307	return put_user(joydev->nkey, (__u8 __user *) argp);
1da177e4 LT	308	case JSIOCSCORR:
1da177e4 LT	309	if (copy_from_user(joydev->corr, argp,
024ac44c	310	sizeof(joydev->corr[0]) * joydev->nabs))
1da177e4 LT	311	return -EFAULT;
	312	for (i = 0; i < joydev->nabs; i++) {
	313	j = joydev->abspam[i];
	314	joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
	315	}
	316	return 0;
	317	case JSIOCGCORR:
	318	return copy_to_user(argp, joydev->corr,
024ac44c	319	sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
1da177e4 LT	320	case JSIOCSAXMAP:
	321	if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1)))
	322	return -EFAULT;
	323	for (i = 0; i < joydev->nabs; i++) {
	324	if (joydev->abspam[i] > ABS_MAX) return -EINVAL;
	325	joydev->absmap[joydev->abspam[i]] = i;
	326	}
	327	return 0;
	328	case JSIOCGAXMAP:
	329	return copy_to_user(argp, joydev->abspam,
	330	sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0;
	331	case JSIOCSBTNMAP:
	332	if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)))
	333	return -EFAULT;
	334	for (i = 0; i < joydev->nkey; i++) {
	335	if (joydev->keypam[i] > KEY_MAX \|\| joydev->keypam[i] < BTN_MISC) return -EINVAL;
	336	joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
	337	}
	338	return 0;
	339	case JSIOCGBTNMAP:
	340	return copy_to_user(argp, joydev->keypam,
	341	sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0;
	342	default:
	343	if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
	344	int len;
	345	if (!dev->name) return 0;
	346	len = strlen(dev->name) + 1;
	347	if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
	348	if (copy_to_user(argp, dev->name, len)) return -EFAULT;
	349	return len;
	350	}
	351	}
	352	return -EINVAL;
	353	}
	354
024ac44c JF	355	#ifdef CONFIG_COMPAT
	356	static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	357	{
	358	struct joydev_list *list = file->private_data;
	359	struct joydev *joydev = list->joydev;
	360	void __user argp = (void __user )arg;
	361	s32 tmp32;
	362	struct JS_DATA_SAVE_TYPE_32 ds32;
	363	int err;
	364
	365	if (!joydev->exist) return -ENODEV;
	366	switch(cmd) {
	367	case JS_SET_TIMELIMIT:
	368	err = get_user(tmp32, (s32 __user *) arg);
	369	if (err == 0)
	370	joydev->glue.JS_TIMELIMIT = tmp32;
	371	break;
	372	case JS_GET_TIMELIMIT:
	373	tmp32 = joydev->glue.JS_TIMELIMIT;
	374	err = put_user(tmp32, (s32 __user *) arg);
	375	break;
	376
	377	case JS_SET_ALL:
	378	err = copy_from_user(&ds32, argp,
	379	sizeof(ds32)) ? -EFAULT : 0;
	380	if (err == 0) {
	381	joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT;
	382	joydev->glue.BUSY = ds32.BUSY;
	383	joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
	384	joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT;
	385	joydev->glue.JS_SAVE = ds32.JS_SAVE;
	386	joydev->glue.JS_CORR = ds32.JS_CORR;
	387	}
	388	break;
	389
	390	case JS_GET_ALL:
	391	ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT;
	392	ds32.BUSY = joydev->glue.BUSY;
	393	ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
	394	ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT;
	395	ds32.JS_SAVE = joydev->glue.JS_SAVE;
	396	ds32.JS_CORR = joydev->glue.JS_CORR;
	397
	398	err = copy_to_user(argp, &ds32,
	399	sizeof(ds32)) ? -EFAULT : 0;
	400	break;
	401
	402	default:
	403	err = joydev_ioctl_common(joydev, cmd, argp);
	404	}
	405	return err;
	406	}
	407	#endif /* CONFIG_COMPAT */
	408
	409	static int joydev_ioctl(struct inode inode, struct file file, unsigned int cmd, unsigned long arg)
	410	{
	411	struct joydev_list *list = file->private_data;
	412	struct joydev *joydev = list->joydev;
	413	void __user argp = (void __user )arg;
	414
	415	if (!joydev->exist) return -ENODEV;
	416
	417	switch(cmd) {
	418	case JS_SET_TIMELIMIT:
419	return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
420	case JS_GET_TIMELIMIT:
421	return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
422	case JS_SET_ALL:
423	return copy_from_user(&joydev->glue, argp,
424	sizeof(joydev->glue)) ? -EFAULT : 0;
425	case JS_GET_ALL:
426	return copy_to_user(argp, &joydev->glue,
427	sizeof(joydev->glue)) ? -EFAULT : 0;
428	default:
429	return joydev_ioctl_common(joydev, cmd, argp);
430	}
431	}
432
1da177e4 LT	433	static struct file_operations joydev_fops = {
	434	.owner = THIS_MODULE,
	435	.read = joydev_read,
	436	.write = joydev_write,
	437	.poll = joydev_poll,
	438	.open = joydev_open,
	439	.release = joydev_release,
	440	.ioctl = joydev_ioctl,
024ac44c JF	441	#ifdef CONFIG_COMPAT
	442	.compat_ioctl = joydev_compat_ioctl,
	443	#endif
1da177e4 LT	444	.fasync = joydev_fasync,
	445	};
	446
	447	static struct input_handle joydev_connect(struct input_handler handler, struct input_dev dev, struct input_device_id id)
	448	{
	449	struct joydev *joydev;
c9bcd582	450	struct class_device *cdev;
1da177e4 LT	451	int i, j, t, minor;
	452
	453	for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++);
	454	if (minor == JOYDEV_MINORS) {
	455	printk(KERN_ERR "joydev: no more free joydev devices\n");
	456	return NULL;
	457	}
	458
b39787a9	459	if (!(joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL)))
1da177e4	460	return NULL;
1da177e4 LT	461
	462	INIT_LIST_HEAD(&joydev->list);
	463	init_waitqueue_head(&joydev->wait);
	464
	465	joydev->minor = minor;
	466	joydev->exist = 1;
	467	joydev->handle.dev = dev;
	468	joydev->handle.name = joydev->name;
	469	joydev->handle.handler = handler;
	470	joydev->handle.private = joydev;
	471	sprintf(joydev->name, "js%d", minor);
	472
	473	for (i = 0; i < ABS_MAX + 1; i++)
	474	if (test_bit(i, dev->absbit)) {
	475	joydev->absmap[i] = joydev->nabs;
	476	joydev->abspam[joydev->nabs] = i;
	477	joydev->nabs++;
	478	}
	479
	480	for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
	481	if (test_bit(i + BTN_MISC, dev->keybit)) {
	482	joydev->keymap[i] = joydev->nkey;
	483	joydev->keypam[joydev->nkey] = i + BTN_MISC;
	484	joydev->nkey++;
	485	}
	486
f24949e8	487	for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
1da177e4 LT	488	if (test_bit(i + BTN_MISC, dev->keybit)) {
	489	joydev->keymap[i] = joydev->nkey;
	490	joydev->keypam[joydev->nkey] = i + BTN_MISC;
	491	joydev->nkey++;
	492	}
	493
	494	for (i = 0; i < joydev->nabs; i++) {
	495	j = joydev->abspam[i];
	496	if (dev->absmax[j] == dev->absmin[j]) {
	497	joydev->corr[i].type = JS_CORR_NONE;
	498	joydev->abs[i] = dev->abs[j];
	499	continue;
	500	}
	501	joydev->corr[i].type = JS_CORR_BROKEN;
	502	joydev->corr[i].prec = dev->absfuzz[j];
	503	joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
	504	joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
	505	if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j])))
	506	continue;
	507	joydev->corr[i].coef[2] = (1 << 29) / t;
	508	joydev->corr[i].coef[3] = (1 << 29) / t;
	509
	510	joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
	511	}
	512
	513	joydev_table[minor] = joydev;
	514
c9bcd582	515	cdev = class_device_create(&input_class, &dev->cdev,
1235686f	516	MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
c9bcd582 GKH	517	dev->cdev.dev, joydev->name);
	518
	519	/* temporary symlink to keep userspace happy */
	520	sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj,
	521	joydev->name);
1da177e4 LT	522
	523	return &joydev->handle;
	524	}
	525
	526	static void joydev_disconnect(struct input_handle *handle)
	527	{
	528	struct joydev *joydev = handle->private;
	529	struct joydev_list *list;
	530
c9bcd582	531	sysfs_remove_link(&input_class.subsys.kset.kobj, joydev->name);
ea9f240b	532	class_device_destroy(&input_class, MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + joydev->minor));
1da177e4 LT	533	joydev->exist = 0;
	534
	535	if (joydev->open) {
	536	input_close_device(handle);
	537	wake_up_interruptible(&joydev->wait);
	538	list_for_each_entry(list, &joydev->list, node)
	539	kill_fasync(&list->fasync, SIGIO, POLL_HUP);
	540	} else
	541	joydev_free(joydev);
	542	}
	543
	544	static struct input_device_id joydev_blacklist[] = {
	545	{
	546	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_KEYBIT,
	547	.evbit = { BIT(EV_KEY) },
	548	.keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
	549	}, /* Avoid itouchpads, touchscreens and tablets */
	550	{ }, /* Terminating entry */
	551	};
	552
	553	static struct input_device_id joydev_ids[] = {
	554	{
	555	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_ABSBIT,
	556	.evbit = { BIT(EV_ABS) },
	557	.absbit = { BIT(ABS_X) },
	558	},
	559	{
	560	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_ABSBIT,
	561	.evbit = { BIT(EV_ABS) },
	562	.absbit = { BIT(ABS_WHEEL) },
	563	},
	564	{
	565	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_ABSBIT,
	566	.evbit = { BIT(EV_ABS) },
	567	.absbit = { BIT(ABS_THROTTLE) },
	568	},
	569	{ }, /* Terminating entry */
	570	};
	571
	572	MODULE_DEVICE_TABLE(input, joydev_ids);
	573
	574	static struct input_handler joydev_handler = {
	575	.event = joydev_event,
	576	.connect = joydev_connect,
	577	.disconnect = joydev_disconnect,
	578	.fops = &joydev_fops,
	579	.minor = JOYDEV_MINOR_BASE,
	580	.name = "joydev",
	581	.id_table = joydev_ids,
	582	.blacklist = joydev_blacklist,
	583	};
	584
	585	static int __init joydev_init(void)
	586	{
	587	input_register_handler(&joydev_handler);
	588	return 0;
	589	}
	590
	591	static void __exit joydev_exit(void)
	592	{
	593	input_unregister_handler(&joydev_handler);
	594	}
	595
	596	module_init(joydev_init);
597	module_exit(joydev_exit);