Viewing file:  joydev.c (14.02 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* $Id: joydev.c,v 1.19 2001/01/10 19:49:40 vojtech Exp $
*
* Copyright (c) 1999-2000 Vojtech Pavlik
* Copyright (c) 1999 Colin Van Dyke
*
* Joystick device driver for the input driver suite.
*
* Sponsored by SuSE and Intel
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Should you need to contact me, the author, you can do so either by
* e-mail - mail your message to <vojtech@suse.cz>, or by paper mail:
* Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic
*/
#include <asm/io.h>
#include <asm/system.h>
#include <asm/segment.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>
#define JOYDEV_MINOR_BASE 0
#define JOYDEV_MINORS 32
#define JOYDEV_BUFFER_SIZE 64
struct joydev {
int exist;
int open;
int minor;
struct input_handle handle;
wait_queue_head_t wait;
devfs_handle_t devfs;
struct joydev *next;
struct joydev_list *list;
struct js_corr corr[ABS_MAX];
struct JS_DATA_SAVE_TYPE glue;
int nabs;
int nkey;
__u16 keymap[KEY_MAX - BTN_MISC];
__u16 keypam[KEY_MAX - BTN_MISC];
__u8 absmap[ABS_MAX];
__u8 abspam[ABS_MAX];
__s16 abs[ABS_MAX];
};
struct joydev_list {
struct js_event buffer[JOYDEV_BUFFER_SIZE];
int head;
int tail;
int startup;
struct fasync_struct *fasync;
struct joydev *joydev;
struct joydev_list *next;
};
static struct joydev *joydev_table[JOYDEV_MINORS];
MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
MODULE_DESCRIPTION("Joystick device driver");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("input/js");
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 = joydev->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 * (1000 / HZ);
while (list) {
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);
list = list->next;
}
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 int joydev_release(struct inode * inode, struct file * file)
{
struct joydev_list *list = file->private_data;
struct joydev_list **listptr;
lock_kernel();
listptr = &list->joydev->list;
joydev_fasync(-1, file, 0);
while (*listptr && (*listptr != list))
listptr = &((*listptr)->next);
*listptr = (*listptr)->next;
if (!--list->joydev->open) {
if (list->joydev->exist) {
input_close_device(&list->joydev->handle);
} else {
input_unregister_minor(list->joydev->devfs);
joydev_table[list->joydev->minor] = NULL;
kfree(list->joydev);
}
}
kfree(list);
unlock_kernel();
return 0;
}
static int joydev_open(struct inode *inode, struct file *file)
{
struct joydev_list *list;
int i = MINOR(inode->i_rdev) - 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->next = joydev_table[i]->list;
joydev_table[i]->list = 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 * buffer, size_t count, loff_t *ppos)
{
return -EINVAL;
}
static ssize_t joydev_read(struct file *file, char *buf, size_t count, loff_t *ppos)
{
DECLARE_WAITQUEUE(wait, current);
struct joydev_list *list = file->private_data;
struct joydev *joydev = list->joydev;
struct input_dev *input = joydev->handle.dev;
int retval = 0;
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->head == list->tail && list->startup == joydev->nabs + joydev->nkey) {
add_wait_queue(&list->joydev->wait, &wait);
current->state = TASK_INTERRUPTIBLE;
while (list->head == list->tail) {
if (file->f_flags & O_NONBLOCK) {
retval = -EAGAIN;
break;
}
if (signal_pending(current)) {
retval = -ERESTARTSYS;
break;
}
schedule();
}
current->state = TASK_RUNNING;
remove_wait_queue(&list->joydev->wait, &wait);
}
if (retval)
return retval;
while (list->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) {
struct js_event event;
event.time = jiffies * (1000/HZ);
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);
if (list->head != list->tail || list->startup < list->joydev->nabs + list->joydev->nkey)
return POLLIN | POLLRDNORM;
return 0;
}
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;
struct input_dev *dev = joydev->handle.dev;
int i;
switch (cmd) {
case JS_SET_CAL:
return copy_from_user(&joydev->glue.JS_CORR, (struct JS_DATA_TYPE *) arg,
sizeof(struct JS_DATA_TYPE)) ? -EFAULT : 0;
case JS_GET_CAL:
return copy_to_user((struct JS_DATA_TYPE *) arg, &joydev->glue.JS_CORR,
sizeof(struct JS_DATA_TYPE)) ? -EFAULT : 0;
case JS_SET_TIMEOUT:
return get_user(joydev->glue.JS_TIMEOUT, (int *) arg);
case JS_GET_TIMEOUT:
return put_user(joydev->glue.JS_TIMEOUT, (int *) arg);
case JS_SET_TIMELIMIT:
return get_user(joydev->glue.JS_TIMELIMIT, (long *) arg);
case JS_GET_TIMELIMIT:
return put_user(joydev->glue.JS_TIMELIMIT, (long *) arg);
case JS_SET_ALL:
return copy_from_user(&joydev->glue, (struct JS_DATA_SAVE_TYPE *) arg,
sizeof(struct JS_DATA_SAVE_TYPE)) ? -EFAULT : 0;
case JS_GET_ALL:
return copy_to_user((struct JS_DATA_SAVE_TYPE *) arg, &joydev->glue,
sizeof(struct JS_DATA_SAVE_TYPE)) ? -EFAULT : 0;
case JSIOCGVERSION:
return put_user(JS_VERSION, (__u32 *) arg);
case JSIOCGAXES:
return put_user(joydev->nabs, (__u8 *) arg);
case JSIOCGBUTTONS:
return put_user(joydev->nkey, (__u8 *) arg);
case JSIOCSCORR:
return copy_from_user(joydev->corr, (struct js_corr *) arg,
sizeof(struct js_corr) * joydev->nabs) ? -EFAULT : 0;
case JSIOCGCORR:
return copy_to_user((struct js_corr *) arg, joydev->corr,
sizeof(struct js_corr) * joydev->nabs) ? -EFAULT : 0;
case JSIOCSAXMAP:
if (copy_from_user((__u8 *) arg, joydev->abspam, sizeof(__u8) * ABS_MAX))
return -EFAULT;
for (i = 0; i < ABS_MAX; i++) {
if (joydev->abspam[i] > ABS_MAX) return -EINVAL;
joydev->absmap[joydev->abspam[i]] = i;
}
return 0;
case JSIOCGAXMAP:
return copy_to_user((__u8 *) arg, joydev->abspam,
sizeof(__u8) * ABS_MAX) ? -EFAULT : 0;
case JSIOCSBTNMAP:
if (copy_from_user((__u16 *) arg, joydev->absmap, sizeof(__u16) * (KEY_MAX - BTN_MISC)))
return -EFAULT;
for (i = 0; i < KEY_MAX - BTN_MISC; i++); {
if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC) return -EINVAL;
joydev->keymap[joydev->abspam[i - BTN_MISC]] = i;
}
return 0;
case JSIOCGBTNMAP:
return copy_to_user((__u16 *) arg, joydev->keypam,
sizeof(__u16) * (KEY_MAX - BTN_MISC)) ? -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((char *) arg, dev->name, len)) return -EFAULT;
return len;
}
}
return -EINVAL;
}
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,
fasync: joydev_fasync,
};
static struct input_handle *joydev_connect(struct input_handler *handler, struct input_dev *dev)
{
struct joydev *joydev;
int i, j, minor;
if (!(test_bit(EV_KEY, dev->evbit) && test_bit(EV_ABS, dev->evbit) &&
(test_bit(ABS_X, dev->absbit) || test_bit(ABS_Y, dev->absbit)) &&
(test_bit(BTN_TRIGGER, dev->keybit) || test_bit(BTN_A, dev->keybit)
|| test_bit(BTN_1, dev->keybit)))) return NULL;
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_waitqueue_head(&joydev->wait);
joydev->minor = minor;
joydev_table[minor] = joydev;
joydev->handle.dev = dev;
joydev->handle.handler = handler;
joydev->handle.private = joydev;
joydev->exist = 1;
for (i = 0; i < ABS_MAX; 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; 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;
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];
joydev->corr[i].coef[2] = (1 << 29) / ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j]);
joydev->corr[i].coef[3] = (1 << 29) / ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j]);
joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
}
joydev->devfs = input_register_minor("js%d", minor, JOYDEV_MINOR_BASE);
// printk(KERN_INFO "js%d: Joystick device for input%d\n", minor, dev->number);
return &joydev->handle;
}
static void joydev_disconnect(struct input_handle *handle)
{
struct joydev *joydev = handle->private;
joydev->exist = 0;
if (joydev->open) {
input_close_device(handle);
} else {
input_unregister_minor(joydev->devfs);
joydev_table[joydev->minor] = NULL;
kfree(joydev);
}
}
static struct input_handler joydev_handler = {
event: joydev_event,
connect: joydev_connect,
disconnect: joydev_disconnect,
fops: &joydev_fops,
minor: JOYDEV_MINOR_BASE,
};
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);
|