Logo Search packages:      
Sourcecode: linux version File versions  Download package

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/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;
      spinlock_t client_lock; /* protects client_list */
      struct mutex mutex;
      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;
      spinlock_t buffer_lock; /* protects access to buffer, head and tail */
      struct fasync_struct *fasync;
      struct joydev *joydev;
      struct list_head node;
};

static struct joydev *joydev_table[JOYDEV_MINORS];
static DEFINE_MUTEX(joydev_table_mutex);

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_pass_event(struct joydev_client *client,
                        struct js_event *event)
{
      struct joydev *joydev = client->joydev;

      /*
       * IRQs already disabled, just acquire the lock
       */
      spin_lock(&client->buffer_lock);

      client->buffer[client->head] = *event;

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

      spin_unlock(&client->buffer_lock);

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

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);

      rcu_read_lock();
      list_for_each_entry_rcu(client, &joydev->client_list, node)
            joydev_pass_event(client, &event);
      rcu_read_unlock();

      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);

      kfree(joydev);
}

static void joydev_attach_client(struct joydev *joydev,
                         struct joydev_client *client)
{
      spin_lock(&joydev->client_lock);
      list_add_tail_rcu(&client->node, &joydev->client_list);
      spin_unlock(&joydev->client_lock);
      synchronize_rcu();
}

static void joydev_detach_client(struct joydev *joydev,
                         struct joydev_client *client)
{
      spin_lock(&joydev->client_lock);
      list_del_rcu(&client->node);
      spin_unlock(&joydev->client_lock);
      synchronize_rcu();
}

static int joydev_open_device(struct joydev *joydev)
{
      int retval;

      retval = mutex_lock_interruptible(&joydev->mutex);
      if (retval)
            return retval;

      if (!joydev->exist)
            retval = -ENODEV;
      else if (!joydev->open++) {
            retval = input_open_device(&joydev->handle);
            if (retval)
                  joydev->open--;
      }

      mutex_unlock(&joydev->mutex);
      return retval;
}

static void joydev_close_device(struct joydev *joydev)
{
      mutex_lock(&joydev->mutex);

      if (joydev->exist && !--joydev->open)
            input_close_device(&joydev->handle);

      mutex_unlock(&joydev->mutex);
}

/*
 * Wake up users waiting for IO so they can disconnect from
 * dead device.
 */
static void joydev_hangup(struct joydev *joydev)
{
      struct joydev_client *client;

      spin_lock(&joydev->client_lock);
      list_for_each_entry(client, &joydev->client_list, node)
            kill_fasync(&client->fasync, SIGIO, POLL_HUP);
      spin_unlock(&joydev->client_lock);

      wake_up_interruptible(&joydev->wait);
}

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);
      joydev_detach_client(joydev, client);
      kfree(client);

      joydev_close_device(joydev);
      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;

      error = mutex_lock_interruptible(&joydev_table_mutex);
      if (error)
            return error;
      joydev = joydev_table[i];
      if (joydev)
            get_device(&joydev->dev);
      mutex_unlock(&joydev_table_mutex);

      if (!joydev)
            return -ENODEV;

      client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
      if (!client) {
            error = -ENOMEM;
            goto err_put_joydev;
      }

      spin_lock_init(&client->buffer_lock);
      client->joydev = joydev;
      joydev_attach_client(joydev, client);

      error = joydev_open_device(joydev);
      if (error)
            goto err_free_client;

      file->private_data = client;
      return 0;

 err_free_client:
      joydev_detach_client(joydev, client);
      kfree(client);
 err_put_joydev:
      put_device(&joydev->dev);
      return error;
}

static int joydev_generate_startup_event(struct joydev_client *client,
                               struct input_dev *input,
                               struct js_event *event)
{
      struct joydev *joydev = client->joydev;
      int have_event;

      spin_lock_irq(&client->buffer_lock);

      have_event = client->startup < joydev->nabs + joydev->nkey;

      if (have_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];
            }
            client->startup++;
      }

      spin_unlock_irq(&client->buffer_lock);

      return have_event;
}

static int joydev_fetch_next_event(struct joydev_client *client,
                           struct js_event *event)
{
      int have_event;

      spin_lock_irq(&client->buffer_lock);

      have_event = client->head != client->tail;
      if (have_event) {
            *event = client->buffer[client->tail++];
            client->tail &= JOYDEV_BUFFER_SIZE - 1;
      }

      spin_unlock_irq(&client->buffer_lock);

      return have_event;
}

/*
 * Old joystick interface
 */
static ssize_t joydev_0x_read(struct joydev_client *client,
                        struct input_dev *input,
                        char __user *buf)
{
      struct joydev *joydev = client->joydev;
      struct JS_DATA_TYPE data;
      int i;

      spin_lock_irq(&input->event_lock);

      /*
       * Get device state
       */
      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;

      /*
       * Reset reader's event queue
       */
      spin_lock(&client->buffer_lock);
      client->startup = 0;
      client->tail = client->head;
      spin_unlock(&client->buffer_lock);

      spin_unlock_irq(&input->event_lock);

      if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
            return -EFAULT;

      return sizeof(struct JS_DATA_TYPE);
}

static inline int joydev_data_pending(struct joydev_client *client)
{
      struct joydev *joydev = client->joydev;

      return client->startup < joydev->nabs + joydev->nkey ||
            client->head != client->tail;
}

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;
      struct js_event event;
      int retval;

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

      if (count < sizeof(struct js_event))
            return -EINVAL;

      if (count == sizeof(struct JS_DATA_TYPE))
            return joydev_0x_read(client, input, buf);

      if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK))
            return -EAGAIN;

      retval = wait_event_interruptible(joydev->wait,
                  !joydev->exist || joydev_data_pending(client));
      if (retval)
            return retval;

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

      while (retval + sizeof(struct js_event) <= count &&
             joydev_generate_startup_event(client, input, &event)) {

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

            retval += sizeof(struct js_event);
      }

      while (retval + sizeof(struct js_event) <= count &&
             joydev_fetch_next_event(client, &event)) {

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

            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 (joydev_data_pending(client) ? (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 & ~IOCSIZE_MASK) == 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 retval;

      retval = mutex_lock_interruptible(&joydev->mutex);
      if (retval)
            return retval;

      if (!joydev->exist) {
            retval = -ENODEV;
            goto out;
      }

      switch (cmd) {

      case JS_SET_TIMELIMIT:
            retval = get_user(tmp32, (s32 __user *) arg);
            if (retval == 0)
                  joydev->glue.JS_TIMELIMIT = tmp32;
            break;

      case JS_GET_TIMELIMIT:
            tmp32 = joydev->glue.JS_TIMELIMIT;
            retval = put_user(tmp32, (s32 __user *) arg);
            break;

      case JS_SET_ALL:
            retval = copy_from_user(&ds32, argp,
                              sizeof(ds32)) ? -EFAULT : 0;
            if (retval == 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;

            retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
            break;

      default:
            retval = joydev_ioctl_common(joydev, cmd, argp);
            break;
      }

 out:
      mutex_unlock(&joydev->mutex);
      return retval;
}
#endif /* CONFIG_COMPAT */

static long joydev_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;
      int retval;

      retval = mutex_lock_interruptible(&joydev->mutex);
      if (retval)
            return retval;

      if (!joydev->exist) {
            retval = -ENODEV;
            goto out;
      }

      switch (cmd) {

      case JS_SET_TIMELIMIT:
            retval = get_user(joydev->glue.JS_TIMELIMIT,
                          (long __user *) arg);
            break;

      case JS_GET_TIMELIMIT:
            retval = put_user(joydev->glue.JS_TIMELIMIT,
                          (long __user *) arg);
            break;

      case JS_SET_ALL:
            retval = copy_from_user(&joydev->glue, argp,
                              sizeof(joydev->glue)) ? -EFAULT: 0;
            break;

      case JS_GET_ALL:
            retval = copy_to_user(argp, &joydev->glue,
                              sizeof(joydev->glue)) ? -EFAULT : 0;
            break;

      default:
            retval = joydev_ioctl_common(joydev, cmd, argp);
            break;
      }
 out:
      mutex_unlock(&joydev->mutex);
      return retval;
}

static const struct file_operations joydev_fops = {
      .owner            = THIS_MODULE,
      .read       = joydev_read,
      .poll       = joydev_poll,
      .open       = joydev_open,
      .release    = joydev_release,
      .unlocked_ioctl   = joydev_ioctl,
#ifdef CONFIG_COMPAT
      .compat_ioctl     = joydev_compat_ioctl,
#endif
      .fasync           = joydev_fasync,
};

static int joydev_install_chrdev(struct joydev *joydev)
{
      joydev_table[joydev->minor] = joydev;
      return 0;
}

static void joydev_remove_chrdev(struct joydev *joydev)
{
      mutex_lock(&joydev_table_mutex);
      joydev_table[joydev->minor] = NULL;
      mutex_unlock(&joydev_table_mutex);
}

/*
 * Mark device non-existant. This disables writes, ioctls and
 * prevents new users from opening the device. Already posted
 * blocking reads will stay, however new ones will fail.
 */
static void joydev_mark_dead(struct joydev *joydev)
{
      mutex_lock(&joydev->mutex);
      joydev->exist = 0;
      mutex_unlock(&joydev->mutex);
}

static void joydev_cleanup(struct joydev *joydev)
{
      struct input_handle *handle = &joydev->handle;

      joydev_mark_dead(joydev);
      joydev_hangup(joydev);
      joydev_remove_chrdev(joydev);

      /* joydev is marked dead so noone else accesses joydev->open */
      if (joydev->open)
            input_close_device(handle);
}

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; minor++)
            if (!joydev_table[minor])
                  break;

      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);
      spin_lock_init(&joydev->client_lock);
      mutex_init(&joydev->mutex);
      init_waitqueue_head(&joydev->wait);

      snprintf(joydev->name, sizeof(joydev->name), "js%d", minor);
      joydev->exist = 1;
      joydev->minor = minor;

      joydev->exist = 1;
      joydev->handle.dev = dev;
      joydev->handle.name = joydev->name;
      joydev->handle.handler = handler;
      joydev->handle.private = joydev;

      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];

            t = (dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j];
            if (t) {
                  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);
            }
      }

      strlcpy(joydev->dev.bus_id, joydev->name, sizeof(joydev->dev.bus_id));
      joydev->dev.devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor);
      joydev->dev.class = &input_class;
      joydev->dev.parent = &dev->dev;
      joydev->dev.release = joydev_free;
      device_initialize(&joydev->dev);

      error = input_register_handle(&joydev->handle);
      if (error)
            goto err_free_joydev;

      error = joydev_install_chrdev(joydev);
      if (error)
            goto err_unregister_handle;

      error = device_add(&joydev->dev);
      if (error)
            goto err_cleanup_joydev;

      return 0;

 err_cleanup_joydev:
      joydev_cleanup(joydev);
 err_unregister_handle:
      input_unregister_handle(&joydev->handle);
 err_free_joydev:
      put_device(&joydev->dev);
      return error;
}

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

      device_del(&joydev->dev);
      joydev_cleanup(joydev);
      input_unregister_handle(handle);
      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_MASK(EV_KEY) },
            .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(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_MASK(EV_ABS) },
            .absbit = { BIT_MASK(ABS_X) },
      },
      {
            .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
                        INPUT_DEVICE_ID_MATCH_ABSBIT,
            .evbit = { BIT_MASK(EV_ABS) },
            .absbit = { BIT_MASK(ABS_WHEEL) },
      },
      {
            .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
                        INPUT_DEVICE_ID_MATCH_ABSBIT,
            .evbit = { BIT_MASK(EV_ABS) },
            .absbit = { BIT_MASK(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);

Generated by  Doxygen 1.6.0   Back to index