[mirror_ubuntu-zesty-kernel.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>
#include <linux/devfs_fs_kernel.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

#define MSECS(t)	(1000 * ((t) / HZ) + 1000 * ((t) % HZ) / HZ)

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 = 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 = kmalloc(sizeof(struct joydev_list), GFP_KERNEL)))
		return -ENOMEM;
	memset(list, 0, sizeof(struct joydev_list));

	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 = 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;
	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 = kmalloc(sizeof(struct joydev), GFP_KERNEL)))
		return NULL;
	memset(joydev, 0, sizeof(struct joydev));

	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;

	devfs_mk_cdev(MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
			S_IFCHR|S_IRUGO|S_IWUSR, "input/js%d", minor);
	class_device_create(input_class,
			MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
			dev->dev, "js%d", minor);

	return &joydev->handle;
}

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

	class_device_destroy(input_class, MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + joydev->minor));
	devfs_remove("input/js%d", 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>
	29	#include <linux/devfs_fs_kernel.h>
	30
	31	MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
	32	MODULE_DESCRIPTION("Joystick device interfaces");
	33	MODULE_SUPPORTED_DEVICE("input/js");
	34	MODULE_LICENSE("GPL");
	35
	36	#define JOYDEV_MINOR_BASE 0
	37	#define JOYDEV_MINORS 16
	38	#define JOYDEV_BUFFER_SIZE 64
	39
	40	#define MSECS(t) (1000 * ((t) / HZ) + 1000 * ((t) % HZ) / HZ)
	41
	42	struct joydev {
	43	int exist;
	44	int open;
	45	int minor;
	46	char name[16];
	47	struct input_handle handle;
	48	wait_queue_head_t wait;
	49	struct list_head list;
	50	struct js_corr corr[ABS_MAX + 1];
	51	struct JS_DATA_SAVE_TYPE glue;
	52	int nabs;
	53	int nkey;
	54	__u16 keymap[KEY_MAX - BTN_MISC + 1];
	55	__u16 keypam[KEY_MAX - BTN_MISC + 1];
	56	__u8 absmap[ABS_MAX + 1];
	57	__u8 abspam[ABS_MAX + 1];
	58	__s16 abs[ABS_MAX + 1];
	59	};
	60
	61	struct joydev_list {
	62	struct js_event buffer[JOYDEV_BUFFER_SIZE];
	63	int head;
	64	int tail;
65	int startup;
66	struct fasync_struct *fasync;
67	struct joydev *joydev;
68	struct list_head node;
69	};
70
71	static struct joydev *joydev_table[JOYDEV_MINORS];
72
73	static int joydev_correct(int value, struct js_corr *corr)
74	{
75	switch (corr->type) {
76	case JS_CORR_NONE:
77	break;
78	case JS_CORR_BROKEN:
79	value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
80	((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
81	((corr->coef[2] * (value - corr->coef[0])) >> 14);
82	break;
83	default:
84	return 0;
85	}
86
87	if (value < -32767) return -32767;
88	if (value > 32767) return 32767;
89
90	return value;
91	}
92
93	static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
94	{
95	struct joydev *joydev = handle->private;
96	struct joydev_list *list;
97	struct js_event event;
98
99	switch (type) {
100
101	case EV_KEY:
102	if (code < BTN_MISC \|\| value == 2) return;
103	event.type = JS_EVENT_BUTTON;
104	event.number = joydev->keymap[code - BTN_MISC];
105	event.value = value;
106	break;
107
108	case EV_ABS:
109	event.type = JS_EVENT_AXIS;
110	event.number = joydev->absmap[code];
111	event.value = joydev_correct(value, joydev->corr + event.number);
112	if (event.value == joydev->abs[event.number]) return;
113	joydev->abs[event.number] = event.value;
114	break;
115
116	default:
117	return;
118	}
119
120	event.time = MSECS(jiffies);
121
122	list_for_each_entry(list, &joydev->list, node) {
123
124	memcpy(list->buffer + list->head, &event, sizeof(struct js_event));
125
126	if (list->startup == joydev->nabs + joydev->nkey)
127	if (list->tail == (list->head = (list->head + 1) & (JOYDEV_BUFFER_SIZE - 1)))
128	list->startup = 0;
129
130	kill_fasync(&list->fasync, SIGIO, POLL_IN);
131	}
132
133	wake_up_interruptible(&joydev->wait);
134	}
135
136	static int joydev_fasync(int fd, struct file *file, int on)
137	{
138	int retval;
139	struct joydev_list *list = file->private_data;
140	retval = fasync_helper(fd, file, on, &list->fasync);
141	return retval < 0 ? retval : 0;
142	}
143
144	static void joydev_free(struct joydev *joydev)
145	{
146	joydev_table[joydev->minor] = NULL;
147	kfree(joydev);
148	}
149
150	static int joydev_release(struct inode * inode, struct file * file)
151	{
152	struct joydev_list *list = file->private_data;
153
154	joydev_fasync(-1, file, 0);
155
156	list_del(&list->node);
157
158	if (!--list->joydev->open) {
159	if (list->joydev->exist)
160	input_close_device(&list->joydev->handle);
161	else
162	joydev_free(list->joydev);
163	}
164
165	kfree(list);
166	return 0;
167	}
168
169	static int joydev_open(struct inode inode, struct file file)
170	{
171	struct joydev_list *list;
172	int i = iminor(inode) - JOYDEV_MINOR_BASE;
173
174	if (i >= JOYDEV_MINORS \|\| !joydev_table[i])
175	return -ENODEV;
176
177	if (!(list = kmalloc(sizeof(struct joydev_list), GFP_KERNEL)))
178	return -ENOMEM;
179	memset(list, 0, sizeof(struct joydev_list));
180
181	list->joydev = joydev_table[i];
182	list_add_tail(&list->node, &joydev_table[i]->list);
183	file->private_data = list;
184
185	if (!list->joydev->open++)
186	if (list->joydev->exist)
187	input_open_device(&list->joydev->handle);
188
189	return 0;
190	}
191
192	static ssize_t joydev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
193	{
194	return -EINVAL;
195	}
196
197	static ssize_t joydev_read(struct file file, char __user buf, size_t count, loff_t *ppos)
198	{
199	struct joydev_list *list = file->private_data;
200	struct joydev *joydev = list->joydev;
201	struct input_dev *input = joydev->handle.dev;
202	int retval = 0;
203
204	if (!list->joydev->exist)
205	return -ENODEV;
206
207	if (count < sizeof(struct js_event))
208	return -EINVAL;
209
210	if (count == sizeof(struct JS_DATA_TYPE)) {
211
212	struct JS_DATA_TYPE data;
213	int i;
214
215	for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
216	data.buttons \|= test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
217	data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
218	data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
219
220	if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
221	return -EFAULT;
222
223	list->startup = 0;
224	list->tail = list->head;
225
226	return sizeof(struct JS_DATA_TYPE);
227	}
228
229	if (list->startup == joydev->nabs + joydev->nkey
230	&& list->head == list->tail && (file->f_flags & O_NONBLOCK))
231	return -EAGAIN;
232
233	retval = wait_event_interruptible(list->joydev->wait,
234	!list->joydev->exist \|\|
235	list->startup < joydev->nabs + joydev->nkey \|\|
236	list->head != list->tail);
237
238	if (retval)
239	return retval;
240
241	if (!list->joydev->exist)
242	return -ENODEV;
243
244	while (list->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) {
245
246	struct js_event event;
247
248	event.time = MSECS(jiffies);
249
250	if (list->startup < joydev->nkey) {
251	event.type = JS_EVENT_BUTTON \| JS_EVENT_INIT;
252	event.number = list->startup;
253	event.value = !!test_bit(joydev->keypam[event.number], input->key);
254	} else {
255	event.type = JS_EVENT_AXIS \| JS_EVENT_INIT;
256	event.number = list->startup - joydev->nkey;
257	event.value = joydev->abs[event.number];
258	}
259
260	if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
261	return -EFAULT;
262
263	list->startup++;
264	retval += sizeof(struct js_event);
265	}
266
267	while (list->head != list->tail && retval + sizeof(struct js_event) <= count) {
268
269	if (copy_to_user(buf + retval, list->buffer + list->tail, sizeof(struct js_event)))
270	return -EFAULT;
271
272	list->tail = (list->tail + 1) & (JOYDEV_BUFFER_SIZE - 1);
273	retval += sizeof(struct js_event);
274	}
275
276	return retval;
277	}
278
279	/* No kernel lock - fine */
280	static unsigned int joydev_poll(struct file file, poll_table wait)
281	{
282	struct joydev_list *list = file->private_data;
283	poll_wait(file, &list->joydev->wait, wait);
284	return ((list->head != list->tail \|\| list->startup < list->joydev->nabs + list->joydev->nkey) ?
285	(POLLIN \| POLLRDNORM) : 0) \| (list->joydev->exist ? 0 : (POLLHUP \| POLLERR));
286	}
287
024ac44c	288	static int joydev_ioctl_common(struct joydev joydev, unsigned int cmd, void __user argp)
1da177e4	289	{
1da177e4	290	struct input_dev *dev = joydev->handle.dev;
1da177e4 LT	291	int i, j;
1da177e4 LT	292
1da177e4 LT	293	switch (cmd) {
	294
	295	case JS_SET_CAL:
	296	return copy_from_user(&joydev->glue.JS_CORR, argp,
024ac44c	297	sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
1da177e4 LT	298	case JS_GET_CAL:
1da177e4 LT	299	return copy_to_user(argp, &joydev->glue.JS_CORR,
024ac44c	300	sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
1da177e4	301	case JS_SET_TIMEOUT:
024ac44c	302	return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
1da177e4	303	case JS_GET_TIMEOUT:
024ac44c	304	return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
1da177e4 LT	305
1da177e4 LT	306	case JSIOCGVERSION:
024ac44c	307	return put_user(JS_VERSION, (__u32 __user *) argp);
1da177e4	308	case JSIOCGAXES:
024ac44c	309	return put_user(joydev->nabs, (__u8 __user *) argp);
1da177e4	310	case JSIOCGBUTTONS:
024ac44c	311	return put_user(joydev->nkey, (__u8 __user *) argp);
1da177e4 LT	312	case JSIOCSCORR:
1da177e4 LT	313	if (copy_from_user(joydev->corr, argp,
024ac44c	314	sizeof(joydev->corr[0]) * joydev->nabs))
1da177e4 LT	315	return -EFAULT;
	316	for (i = 0; i < joydev->nabs; i++) {
	317	j = joydev->abspam[i];
	318	joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
	319	}
	320	return 0;
	321	case JSIOCGCORR:
	322	return copy_to_user(argp, joydev->corr,
024ac44c	323	sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
1da177e4 LT	324	case JSIOCSAXMAP:
	325	if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1)))
	326	return -EFAULT;
	327	for (i = 0; i < joydev->nabs; i++) {
	328	if (joydev->abspam[i] > ABS_MAX) return -EINVAL;
	329	joydev->absmap[joydev->abspam[i]] = i;
	330	}
	331	return 0;
	332	case JSIOCGAXMAP:
	333	return copy_to_user(argp, joydev->abspam,
	334	sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0;
	335	case JSIOCSBTNMAP:
	336	if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)))
	337	return -EFAULT;
	338	for (i = 0; i < joydev->nkey; i++) {
	339	if (joydev->keypam[i] > KEY_MAX \|\| joydev->keypam[i] < BTN_MISC) return -EINVAL;
	340	joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
	341	}
	342	return 0;
	343	case JSIOCGBTNMAP:
	344	return copy_to_user(argp, joydev->keypam,
	345	sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0;
	346	default:
	347	if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
	348	int len;
	349	if (!dev->name) return 0;
	350	len = strlen(dev->name) + 1;
	351	if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
	352	if (copy_to_user(argp, dev->name, len)) return -EFAULT;
	353	return len;
	354	}
	355	}
	356	return -EINVAL;
	357	}
	358
024ac44c JF	359	#ifdef CONFIG_COMPAT
	360	static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	361	{
	362	struct joydev_list *list = file->private_data;
	363	struct joydev *joydev = list->joydev;
	364	void __user argp = (void __user )arg;
	365	s32 tmp32;
	366	struct JS_DATA_SAVE_TYPE_32 ds32;
	367	int err;
	368
	369	if (!joydev->exist) return -ENODEV;
	370	switch(cmd) {
	371	case JS_SET_TIMELIMIT:
	372	err = get_user(tmp32, (s32 __user *) arg);
	373	if (err == 0)
	374	joydev->glue.JS_TIMELIMIT = tmp32;
	375	break;
	376	case JS_GET_TIMELIMIT:
	377	tmp32 = joydev->glue.JS_TIMELIMIT;
	378	err = put_user(tmp32, (s32 __user *) arg);
	379	break;
	380
	381	case JS_SET_ALL:
	382	err = copy_from_user(&ds32, argp,
	383	sizeof(ds32)) ? -EFAULT : 0;
	384	if (err == 0) {
	385	joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT;
	386	joydev->glue.BUSY = ds32.BUSY;
	387	joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
	388	joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT;
	389	joydev->glue.JS_SAVE = ds32.JS_SAVE;
	390	joydev->glue.JS_CORR = ds32.JS_CORR;
	391	}
	392	break;
	393
	394	case JS_GET_ALL:
	395	ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT;
	396	ds32.BUSY = joydev->glue.BUSY;
	397	ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
	398	ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT;
	399	ds32.JS_SAVE = joydev->glue.JS_SAVE;
	400	ds32.JS_CORR = joydev->glue.JS_CORR;
	401
	402	err = copy_to_user(argp, &ds32,
	403	sizeof(ds32)) ? -EFAULT : 0;
	404	break;
	405
	406	default:
	407	err = joydev_ioctl_common(joydev, cmd, argp);
	408	}
	409	return err;
	410	}
	411	#endif /* CONFIG_COMPAT */
	412
	413	static int joydev_ioctl(struct inode inode, struct file file, unsigned int cmd, unsigned long arg)
	414	{
	415	struct joydev_list *list = file->private_data;
	416	struct joydev *joydev = list->joydev;
	417	void __user argp = (void __user )arg;
	418
	419	if (!joydev->exist) return -ENODEV;
	420
	421	switch(cmd) {
	422	case JS_SET_TIMELIMIT:
423	return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
424	case JS_GET_TIMELIMIT:
425	return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
426	case JS_SET_ALL:
427	return copy_from_user(&joydev->glue, argp,
428	sizeof(joydev->glue)) ? -EFAULT : 0;
429	case JS_GET_ALL:
430	return copy_to_user(argp, &joydev->glue,
431	sizeof(joydev->glue)) ? -EFAULT : 0;
432	default:
433	return joydev_ioctl_common(joydev, cmd, argp);
434	}
435	}
436
1da177e4 LT	437	static struct file_operations joydev_fops = {
	438	.owner = THIS_MODULE,
	439	.read = joydev_read,
	440	.write = joydev_write,
	441	.poll = joydev_poll,
	442	.open = joydev_open,
	443	.release = joydev_release,
	444	.ioctl = joydev_ioctl,
024ac44c JF	445	#ifdef CONFIG_COMPAT
	446	.compat_ioctl = joydev_compat_ioctl,
	447	#endif
1da177e4 LT	448	.fasync = joydev_fasync,
	449	};
	450
	451	static struct input_handle joydev_connect(struct input_handler handler, struct input_dev dev, struct input_device_id id)
	452	{
	453	struct joydev *joydev;
	454	int i, j, t, minor;
	455
	456	for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++);
	457	if (minor == JOYDEV_MINORS) {
	458	printk(KERN_ERR "joydev: no more free joydev devices\n");
	459	return NULL;
	460	}
	461
	462	if (!(joydev = kmalloc(sizeof(struct joydev), GFP_KERNEL)))
	463	return NULL;
	464	memset(joydev, 0, sizeof(struct joydev));
	465
	466	INIT_LIST_HEAD(&joydev->list);
	467	init_waitqueue_head(&joydev->wait);
	468
	469	joydev->minor = minor;
	470	joydev->exist = 1;
	471	joydev->handle.dev = dev;
	472	joydev->handle.name = joydev->name;
	473	joydev->handle.handler = handler;
	474	joydev->handle.private = joydev;
	475	sprintf(joydev->name, "js%d", minor);
	476
	477	for (i = 0; i < ABS_MAX + 1; i++)
	478	if (test_bit(i, dev->absbit)) {
	479	joydev->absmap[i] = joydev->nabs;
	480	joydev->abspam[joydev->nabs] = i;
	481	joydev->nabs++;
	482	}
	483
	484	for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
	485	if (test_bit(i + BTN_MISC, dev->keybit)) {
	486	joydev->keymap[i] = joydev->nkey;
	487	joydev->keypam[joydev->nkey] = i + BTN_MISC;
	488	joydev->nkey++;
	489	}
	490
f24949e8	491	for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
1da177e4 LT	492	if (test_bit(i + BTN_MISC, dev->keybit)) {
	493	joydev->keymap[i] = joydev->nkey;
	494	joydev->keypam[joydev->nkey] = i + BTN_MISC;
	495	joydev->nkey++;
	496	}
	497
	498	for (i = 0; i < joydev->nabs; i++) {
	499	j = joydev->abspam[i];
	500	if (dev->absmax[j] == dev->absmin[j]) {
	501	joydev->corr[i].type = JS_CORR_NONE;
	502	joydev->abs[i] = dev->abs[j];
	503	continue;
	504	}
	505	joydev->corr[i].type = JS_CORR_BROKEN;
	506	joydev->corr[i].prec = dev->absfuzz[j];
	507	joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
	508	joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
	509	if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j])))
	510	continue;
	511	joydev->corr[i].coef[2] = (1 << 29) / t;
	512	joydev->corr[i].coef[3] = (1 << 29) / t;
	513
	514	joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
	515	}
	516
	517	joydev_table[minor] = joydev;
	518
	519	devfs_mk_cdev(MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
	520	S_IFCHR\|S_IRUGO\|S_IWUSR, "input/js%d", minor);
1235686f GKH	521	class_device_create(input_class,
	522	MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
	523	dev->dev, "js%d", minor);
1da177e4 LT	524
	525	return &joydev->handle;
	526	}
	527
	528	static void joydev_disconnect(struct input_handle *handle)
	529	{
	530	struct joydev *joydev = handle->private;
	531	struct joydev_list *list;
	532
1235686f	533	class_device_destroy(input_class, MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + joydev->minor));
1da177e4 LT	534	devfs_remove("input/js%d", joydev->minor);
	535	joydev->exist = 0;
	536
	537	if (joydev->open) {
	538	input_close_device(handle);
	539	wake_up_interruptible(&joydev->wait);
	540	list_for_each_entry(list, &joydev->list, node)
	541	kill_fasync(&list->fasync, SIGIO, POLL_HUP);
	542	} else
	543	joydev_free(joydev);
	544	}
	545
	546	static struct input_device_id joydev_blacklist[] = {
	547	{
	548	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_KEYBIT,
	549	.evbit = { BIT(EV_KEY) },
	550	.keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
	551	}, /* Avoid itouchpads, touchscreens and tablets */
	552	{ }, /* Terminating entry */
	553	};
	554
	555	static struct input_device_id joydev_ids[] = {
	556	{
	557	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_ABSBIT,
	558	.evbit = { BIT(EV_ABS) },
	559	.absbit = { BIT(ABS_X) },
	560	},
	561	{
	562	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_ABSBIT,
	563	.evbit = { BIT(EV_ABS) },
	564	.absbit = { BIT(ABS_WHEEL) },
	565	},
	566	{
	567	.flags = INPUT_DEVICE_ID_MATCH_EVBIT \| INPUT_DEVICE_ID_MATCH_ABSBIT,
	568	.evbit = { BIT(EV_ABS) },
	569	.absbit = { BIT(ABS_THROTTLE) },
	570	},
	571	{ }, /* Terminating entry */
	572	};
	573
	574	MODULE_DEVICE_TABLE(input, joydev_ids);
	575
	576	static struct input_handler joydev_handler = {
	577	.event = joydev_event,
	578	.connect = joydev_connect,
	579	.disconnect = joydev_disconnect,
	580	.fops = &joydev_fops,
	581	.minor = JOYDEV_MINOR_BASE,
	582	.name = "joydev",
	583	.id_table = joydev_ids,
	584	.blacklist = joydev_blacklist,
	585	};
	586
	587	static int __init joydev_init(void)
	588	{
	589	input_register_handler(&joydev_handler);
	590	return 0;
	591	}
	592
	593	static void __exit joydev_exit(void)
	594	{
	595	input_unregister_handler(&joydev_handler);
	596	}
	597
598	module_init(joydev_init);
599	module_exit(joydev_exit);