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linux/drivers/input/joydev.c

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/*
* 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);
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