WebSVN - shark - Rev 494 - /shark/trunk/drivers/input/evdev.c

/*
* Event char devices, giving access to raw input device events.
*
* Copyright (c) 1999-2002 Vojtech Pavlik
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*/

#include <linuxcomp.h>

#define EVDEV_MINOR_BASE 64
#define EVDEV_MINORS 32
#define EVDEV_BUFFER_SIZE 64

#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/major.h>
#include <linux/smp_lock.h>
#include <linux/device.h>
#include <linux/devfs_fs_kernel.h>

struct evdev {
int exist;
int open;
int minor;
char name[16];
struct input_handle handle;
wait_queue_head_t wait;
struct evdev_list *grab;
struct list_head list;
};

struct evdev_list {
struct input_event buffer[EVDEV_BUFFER_SIZE];
int head;
int tail;
struct fasync_struct *fasync;
struct evdev *evdev;
struct list_head node;
};

static struct evdev *evdev_table[EVDEV_MINORS];

static void evdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
{
struct evdev *evdev = handle->private;
struct evdev_list *list;

if (evdev->grab) {
list = evdev->grab;

do_gettimeofday(&list->buffer[list->head].time);
list->buffer[list->head].type = type;
list->buffer[list->head].code = code;
list->buffer[list->head].value = value;
list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1);

kill_fasync(&list->fasync, SIGIO, POLL_IN);
} else
list_for_each_entry(list, &evdev->list, node) {

do_gettimeofday(&list->buffer[list->head].time);
list->buffer[list->head].type = type;
list->buffer[list->head].code = code;
list->buffer[list->head].value = value;
list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1);

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

wake_up_interruptible(&evdev->wait);
}

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

static int evdev_flush(struct file * file)
{
struct evdev_list *list = file->private_data;
if (!list->evdev->exist) return -ENODEV;
return input_flush_device(&list->evdev->handle, file);
}

static void evdev_free(struct evdev *evdev)
{
devfs_remove("input/event%d", evdev->minor);
evdev_table[evdev->minor] = NULL;
kfree(evdev);
}

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

if (list->evdev->grab == list) {
input_release_device(&list->evdev->handle);
list->evdev->grab = NULL;
}

evdev_fasync(-1, file, 0);
list_del(&list->node);

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

kfree(list);
return 0;
}

static int evdev_open(struct inode * inode, struct file * file)
{
struct evdev_list *list;
int i = iminor(inode) - EVDEV_MINOR_BASE;
int accept_err;

if (i >= EVDEV_MINORS || !evdev_table[i])
return -ENODEV;

if ((accept_err = input_accept_process(&(evdev_table[i]->handle), file)))
return accept_err;

if (!(list = kmalloc(sizeof(struct evdev_list), GFP_KERNEL)))
return -ENOMEM;
memset(list, 0, sizeof(struct evdev_list));

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

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

return 0;
}

static ssize_t evdev_write(struct file * file, const char * buffer, size_t count, loff_t *ppos)
{
struct evdev_list *list = file->private_data;
struct input_event event;
int retval = 0;

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

while (retval < count) {

if (copy_from_user(&event, buffer + retval, sizeof(struct input_event)))
return -EFAULT;
input_event(list->evdev->handle.dev, event.type, event.code, event.value);
retval += sizeof(struct input_event);
}

return retval;
}

static ssize_t evdev_read(struct file * file, char * buffer, size_t count, loff_t *ppos)
{
struct evdev_list *list = file->private_data;
int retval;

if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
return -EAGAIN;

retval = wait_event_interruptible(list->evdev->wait,
list->head != list->tail && list->evdev->exist);

if (retval)
return retval;

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

while (list->head != list->tail && retval + sizeof(struct input_event) <= count) {
if (copy_to_user(buffer + retval, list->buffer + list->tail,
sizeof(struct input_event))) return -EFAULT;
list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
retval += sizeof(struct input_event);
}

return retval;
}

/* No kernel lock - fine */
static unsigned int evdev_poll(struct file *file, poll_table *wait)
{
struct evdev_list *list = file->private_data;
poll_wait(file, &list->evdev->wait, wait);
if (list->head != list->tail)
return POLLIN | POLLRDNORM;
return 0;
}

static int evdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
struct evdev_list *list = file->private_data;
struct evdev *evdev = list->evdev;
struct input_dev *dev = evdev->handle.dev;
struct input_absinfo abs;
int i, t, u, v;

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

switch (cmd) {

case EVIOCGVERSION:
return put_user(EV_VERSION, (int *) arg);

case EVIOCGID:
return copy_to_user((void *) arg, &dev->id, sizeof(struct input_id)) ? -EFAULT : 0;

case EVIOCGKEYCODE:
if (get_user(t, ((int *) arg) + 0)) return -EFAULT;
if (t < 0 || t > dev->keycodemax || !dev->keycodesize) return -EINVAL;
if (put_user(INPUT_KEYCODE(dev, t), ((int *) arg) + 1)) return -EFAULT;
return 0;

case EVIOCSKEYCODE:
if (get_user(t, ((int *) arg) + 0)) return -EFAULT;
if (t < 0 || t > dev->keycodemax || !dev->keycodesize) return -EINVAL;
if (get_user(v, ((int *) arg) + 1)) return -EFAULT;
u = INPUT_KEYCODE(dev, t);
INPUT_KEYCODE(dev, t) = v;
for (i = 0; i < dev->keycodemax; i++) if (v == u) break;
if (i == dev->keycodemax) clear_bit(u, dev->keybit);
set_bit(v, dev->keybit);
return 0;

case EVIOCSFF:
if (dev->upload_effect) {
struct ff_effect effect;
int err;

if (copy_from_user((void*)(&effect), (void*)arg, sizeof(effect)))
return -EFAULT;
err = dev->upload_effect(dev, &effect);
if (put_user(effect.id, &(((struct ff_effect*)arg)->id)))
return -EFAULT;
return err;
}
else return -ENOSYS;

case EVIOCRMFF:
if (dev->erase_effect) {
return dev->erase_effect(dev, (int)arg);
}
else return -ENOSYS;

case EVIOCGEFFECTS:
if (put_user(dev->ff_effects_max, (int*) arg))
return -EFAULT;
return 0;

case EVIOCGRAB:
if (arg) {
if (evdev->grab)
return -EBUSY;
if (input_grab_device(&evdev->handle))
return -EBUSY;
evdev->grab = list;
return 0;
} else {
if (evdev->grab != list)
return -EINVAL;
input_release_device(&evdev->handle);
evdev->grab = NULL;
return 0;
}

default:

if (_IOC_TYPE(cmd) != 'E' || _IOC_DIR(cmd) != _IOC_READ)
return -EINVAL;

if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {

long *bits;
int len;

switch (_IOC_NR(cmd) & EV_MAX) {
case 0: bits = dev->evbit; len = EV_MAX; break;
case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
case EV_REL: bits = dev->relbit; len = REL_MAX; break;
case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
default: return -EINVAL;
}
len = NBITS(len) * sizeof(long);
if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
return copy_to_user((char *) arg, bits, len) ? -EFAULT : len;
}

if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) {
int len;
len = NBITS(KEY_MAX) * sizeof(long);
if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
return copy_to_user((char *) arg, dev->key, len) ? -EFAULT : len;
}

if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) {
int len;
len = NBITS(LED_MAX) * sizeof(long);
if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
return copy_to_user((char *) arg, dev->led, len) ? -EFAULT : len;
}

if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) {
int len;
len = NBITS(SND_MAX) * sizeof(long);
if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
return copy_to_user((char *) arg, dev->snd, len) ? -EFAULT : len;
}

if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) {
int len;
if (!dev->name) return -ENOENT;
len = strlen(dev->name) + 1;
if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
return copy_to_user((char *) arg, dev->name, len) ? -EFAULT : len;
}

if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) {
int len;
if (!dev->phys) return -ENOENT;
len = strlen(dev->phys) + 1;
if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
return copy_to_user((char *) arg, dev->phys, len) ? -EFAULT : len;
}

if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) {
int len;
if (!dev->uniq) return -ENOENT;
len = strlen(dev->uniq) + 1;
if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
return copy_to_user((char *) arg, dev->uniq, len) ? -EFAULT : len;
}

if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {

int t = _IOC_NR(cmd) & ABS_MAX;

abs.value = dev->abs[t];
abs.minimum = dev->absmin[t];
abs.maximum = dev->absmax[t];
abs.fuzz = dev->absfuzz[t];
abs.flat = dev->absflat[t];

if (copy_to_user((void *) arg, &abs, sizeof(struct input_absinfo)))
return -EFAULT;

return 0;
}

if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {

int t = _IOC_NR(cmd) & ABS_MAX;

if (copy_from_user(&abs, (void *) arg, sizeof(struct input_absinfo)))
return -EFAULT;

dev->abs[t] = abs.value;
dev->absmin[t] = abs.minimum;
dev->absmax[t] = abs.maximum;
dev->absfuzz[t] = abs.fuzz;
dev->absflat[t] = abs.flat;

return 0;
}
}
return -EINVAL;
}

static struct file_operations evdev_fops = {
.owner = THIS_MODULE,
.read = evdev_read,
.write = evdev_write,
.poll = evdev_poll,
.open = evdev_open,
.release = evdev_release,
.ioctl = evdev_ioctl,
.fasync = evdev_fasync,
.flush = evdev_flush
};

static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
{
struct evdev *evdev;
int minor;

for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++);
if (minor == EVDEV_MINORS) {
printk(KERN_ERR "evdev: no more free evdev devices\n");
return NULL;
}

if (!(evdev = kmalloc(sizeof(struct evdev), GFP_KERNEL)))
return NULL;
memset(evdev, 0, sizeof(struct evdev));

INIT_LIST_HEAD(&evdev->list);
init_waitqueue_head(&evdev->wait);

evdev->exist = 1;
evdev->minor = minor;
evdev->handle.dev = dev;
evdev->handle.name = evdev->name;
evdev->handle.handler = handler;
evdev->handle.private = evdev;
sprintf26(evdev->name, "event%d", minor);

evdev_table[minor] = evdev;

devfs_mk_cdev(MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
S_IFCHR|S_IRUGO|S_IWUSR, "input/event%d", minor);

return &evdev->handle;
}

static void evdev_disconnect(struct input_handle *handle)
{
struct evdev *evdev = handle->private;

evdev->exist = 0;

if (evdev->open) {
input_close_device(handle);
wake_up_interruptible(&evdev->wait);
} else
evdev_free(evdev);
}

static struct input_device_id evdev_ids[] = {
{ .driver_info = 1 }, /* Matches all devices */
{ }, /* Terminating zero entry */
};

MODULE_DEVICE_TABLE(input, evdev_ids);

static struct input_handler evdev_handler = {
.event = evdev_event,
.connect = evdev_connect,
.disconnect = evdev_disconnect,
.fops = &evdev_fops,
.minor = EVDEV_MINOR_BASE,
.name = "evdev",
.id_table = evdev_ids,
};

/*static*/ int __init evdev_init(void)
{
input_register_handler(&evdev_handler);
return 0;
}

/*static*/ void __exit evdev_exit(void)
{
input_unregister_handler(&evdev_handler);
}

module_init(evdev_init);
module_exit(evdev_exit);

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Input driver event char devices");
MODULE_LICENSE("GPL");

Subversion Repositories shark

(root)/shark/trunk/drivers/input/evdev.c @ 518 - Rev 494