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mousedev.c

/*
 * Input driver to ExplorerPS/2 device driver module.
 *
 * Copyright (c) 1999-2002 Vojtech Pavlik
 * Copyright (c) 2004      Dmitry Torokhov
 *
 * 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.
 */

#define MOUSEDEV_MINOR_BASE   32
#define MOUSEDEV_MINORS       32
#define MOUSEDEV_MIX          31

#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/random.h>
#include <linux/major.h>
#include <linux/device.h>
#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
#include <linux/miscdevice.h>
#endif

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces");
MODULE_LICENSE("GPL");

#ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_X
#define CONFIG_INPUT_MOUSEDEV_SCREEN_X    1024
#endif
#ifndef CONFIG_INPUT_MOUSEDEV_SCREEN_Y
#define CONFIG_INPUT_MOUSEDEV_SCREEN_Y    768
#endif

static int xres = CONFIG_INPUT_MOUSEDEV_SCREEN_X;
module_param(xres, uint, 0644);
MODULE_PARM_DESC(xres, "Horizontal screen resolution");

static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y;
module_param(yres, uint, 0644);
MODULE_PARM_DESC(yres, "Vertical screen resolution");

static unsigned tap_time = 200;
module_param(tap_time, uint, 0644);
MODULE_PARM_DESC(tap_time, "Tap time for touchpads in absolute mode (msecs)");

struct mousedev_hw_data {
      int dx, dy, dz;
      int x, y;
      int abs_event;
      unsigned long buttons;
};

struct mousedev {
      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 list_head mixdev_node;
      int mixdev_open;

      struct mousedev_hw_data packet;
      unsigned int pkt_count;
      int old_x[4], old_y[4];
      int frac_dx, frac_dy;
      unsigned long touch;
};

enum mousedev_emul {
      MOUSEDEV_EMUL_PS2,
      MOUSEDEV_EMUL_IMPS,
      MOUSEDEV_EMUL_EXPS
};

struct mousedev_motion {
      int dx, dy, dz;
      unsigned long buttons;
};

#define PACKET_QUEUE_LEN      16
struct mousedev_client {
      struct fasync_struct *fasync;
      struct mousedev *mousedev;
      struct list_head node;

      struct mousedev_motion packets[PACKET_QUEUE_LEN];
      unsigned int head, tail;
      spinlock_t packet_lock;
      int pos_x, pos_y;

      signed char ps2[6];
      unsigned char ready, buffer, bufsiz;
      unsigned char imexseq, impsseq;
      enum mousedev_emul mode;
      unsigned long last_buttons;
};

#define MOUSEDEV_SEQ_LEN      6

static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };

static struct input_handler mousedev_handler;

static struct mousedev *mousedev_table[MOUSEDEV_MINORS];
static DEFINE_MUTEX(mousedev_table_mutex);
static struct mousedev *mousedev_mix;
static LIST_HEAD(mousedev_mix_list);

static void mixdev_open_devices(void);
static void mixdev_close_devices(void);

#define fx(i)  (mousedev->old_x[(mousedev->pkt_count - (i)) & 03])
#define fy(i)  (mousedev->old_y[(mousedev->pkt_count - (i)) & 03])

static void mousedev_touchpad_event(struct input_dev *dev,
                            struct mousedev *mousedev,
                            unsigned int code, int value)
{
      int size, tmp;
      enum { FRACTION_DENOM = 128 };

      switch (code) {

      case ABS_X:
            fx(0) = value;
            if (mousedev->touch && mousedev->pkt_count >= 2) {
                  size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
                  if (size == 0)
                        size = 256 * 2;
                  tmp = ((value - fx(2)) * 256 * FRACTION_DENOM) / size;
                  tmp += mousedev->frac_dx;
                  mousedev->packet.dx = tmp / FRACTION_DENOM;
                  mousedev->frac_dx =
                        tmp - mousedev->packet.dx * FRACTION_DENOM;
            }
            break;

      case ABS_Y:
            fy(0) = value;
            if (mousedev->touch && mousedev->pkt_count >= 2) {
                  /* use X size to keep the same scale */
                  size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
                  if (size == 0)
                        size = 256 * 2;
                  tmp = -((value - fy(2)) * 256 * FRACTION_DENOM) / size;
                  tmp += mousedev->frac_dy;
                  mousedev->packet.dy = tmp / FRACTION_DENOM;
                  mousedev->frac_dy = tmp -
                        mousedev->packet.dy * FRACTION_DENOM;
            }
            break;
      }
}

static void mousedev_abs_event(struct input_dev *dev, struct mousedev *mousedev,
                        unsigned int code, int value)
{
      int size;

      switch (code) {

      case ABS_X:
            size = dev->absmax[ABS_X] - dev->absmin[ABS_X];
            if (size == 0)
                  size = xres ? : 1;
            if (value > dev->absmax[ABS_X])
                  value = dev->absmax[ABS_X];
            if (value < dev->absmin[ABS_X])
                  value = dev->absmin[ABS_X];
            mousedev->packet.x =
                  ((value - dev->absmin[ABS_X]) * xres) / size;
            mousedev->packet.abs_event = 1;
            break;

      case ABS_Y:
            size = dev->absmax[ABS_Y] - dev->absmin[ABS_Y];
            if (size == 0)
                  size = yres ? : 1;
            if (value > dev->absmax[ABS_Y])
                  value = dev->absmax[ABS_Y];
            if (value < dev->absmin[ABS_Y])
                  value = dev->absmin[ABS_Y];
            mousedev->packet.y = yres -
                  ((value - dev->absmin[ABS_Y]) * yres) / size;
            mousedev->packet.abs_event = 1;
            break;
      }
}

static void mousedev_rel_event(struct mousedev *mousedev,
                        unsigned int code, int value)
{
      switch (code) {
      case REL_X:
            mousedev->packet.dx += value;
            break;

      case REL_Y:
            mousedev->packet.dy -= value;
            break;

      case REL_WHEEL:
            mousedev->packet.dz -= value;
            break;
      }
}

static void mousedev_key_event(struct mousedev *mousedev,
                        unsigned int code, int value)
{
      int index;

      switch (code) {

      case BTN_TOUCH:
      case BTN_0:
      case BTN_LEFT:          index = 0; break;

      case BTN_STYLUS:
      case BTN_1:
      case BTN_RIGHT:         index = 1; break;

      case BTN_2:
      case BTN_FORWARD:
      case BTN_STYLUS2:
      case BTN_MIDDLE:  index = 2; break;

      case BTN_3:
      case BTN_BACK:
      case BTN_SIDE:          index = 3; break;

      case BTN_4:
      case BTN_EXTRA:         index = 4; break;

      default:          return;
      }

      if (value) {
            set_bit(index, &mousedev->packet.buttons);
            set_bit(index, &mousedev_mix->packet.buttons);
      } else {
            clear_bit(index, &mousedev->packet.buttons);
            clear_bit(index, &mousedev_mix->packet.buttons);
      }
}

static void mousedev_notify_readers(struct mousedev *mousedev,
                            struct mousedev_hw_data *packet)
{
      struct mousedev_client *client;
      struct mousedev_motion *p;
      unsigned int new_head;
      int wake_readers = 0;

      rcu_read_lock();
      list_for_each_entry_rcu(client, &mousedev->client_list, node) {

            /* Just acquire the lock, interrupts already disabled */
            spin_lock(&client->packet_lock);

            p = &client->packets[client->head];
            if (client->ready && p->buttons != mousedev->packet.buttons) {
                  new_head = (client->head + 1) % PACKET_QUEUE_LEN;
                  if (new_head != client->tail) {
                        p = &client->packets[client->head = new_head];
                        memset(p, 0, sizeof(struct mousedev_motion));
                  }
            }

            if (packet->abs_event) {
                  p->dx += packet->x - client->pos_x;
                  p->dy += packet->y - client->pos_y;
                  client->pos_x = packet->x;
                  client->pos_y = packet->y;
            }

            client->pos_x += packet->dx;
            client->pos_x = client->pos_x < 0 ?
                  0 : (client->pos_x >= xres ? xres : client->pos_x);
            client->pos_y += packet->dy;
            client->pos_y = client->pos_y < 0 ?
                  0 : (client->pos_y >= yres ? yres : client->pos_y);

            p->dx += packet->dx;
            p->dy += packet->dy;
            p->dz += packet->dz;
            p->buttons = mousedev->packet.buttons;

            if (p->dx || p->dy || p->dz ||
                p->buttons != client->last_buttons)
                  client->ready = 1;

            spin_unlock(&client->packet_lock);

            if (client->ready) {
                  kill_fasync(&client->fasync, SIGIO, POLL_IN);
                  wake_readers = 1;
            }
      }
      rcu_read_unlock();

      if (wake_readers)
            wake_up_interruptible(&mousedev->wait);
}

static void mousedev_touchpad_touch(struct mousedev *mousedev, int value)
{
      if (!value) {
            if (mousedev->touch &&
                time_before(jiffies,
                        mousedev->touch + msecs_to_jiffies(tap_time))) {
                  /*
                   * Toggle left button to emulate tap.
                   * We rely on the fact that mousedev_mix always has 0
                   * motion packet so we won't mess current position.
                   */
                  set_bit(0, &mousedev->packet.buttons);
                  set_bit(0, &mousedev_mix->packet.buttons);
                  mousedev_notify_readers(mousedev, &mousedev_mix->packet);
                  mousedev_notify_readers(mousedev_mix,
                                    &mousedev_mix->packet);
                  clear_bit(0, &mousedev->packet.buttons);
                  clear_bit(0, &mousedev_mix->packet.buttons);
            }
            mousedev->touch = mousedev->pkt_count = 0;
            mousedev->frac_dx = 0;
            mousedev->frac_dy = 0;

      } else if (!mousedev->touch)
            mousedev->touch = jiffies;
}

static void mousedev_event(struct input_handle *handle,
                     unsigned int type, unsigned int code, int value)
{
      struct mousedev *mousedev = handle->private;

      switch (type) {

      case EV_ABS:
            /* Ignore joysticks */
            if (test_bit(BTN_TRIGGER, handle->dev->keybit))
                  return;

            if (test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
                  mousedev_touchpad_event(handle->dev,
                                    mousedev, code, value);
            else
                  mousedev_abs_event(handle->dev, mousedev, code, value);

            break;

      case EV_REL:
            mousedev_rel_event(mousedev, code, value);
            break;

      case EV_KEY:
            if (value != 2) {
                  if (code == BTN_TOUCH &&
                      test_bit(BTN_TOOL_FINGER, handle->dev->keybit))
                        mousedev_touchpad_touch(mousedev, value);
                  else
                        mousedev_key_event(mousedev, code, value);
            }
            break;

      case EV_SYN:
            if (code == SYN_REPORT) {
                  if (mousedev->touch) {
                        mousedev->pkt_count++;
                        /*
                         * Input system eats duplicate events,
                         * but we need all of them to do correct
                         * averaging so apply present one forward
                         */
                        fx(0) = fx(1);
                        fy(0) = fy(1);
                  }

                  mousedev_notify_readers(mousedev, &mousedev->packet);
                  mousedev_notify_readers(mousedev_mix, &mousedev->packet);

                  mousedev->packet.dx = mousedev->packet.dy =
                        mousedev->packet.dz = 0;
                  mousedev->packet.abs_event = 0;
            }
            break;
      }
}

static int mousedev_fasync(int fd, struct file *file, int on)
{
      int retval;
      struct mousedev_client *client = file->private_data;

      retval = fasync_helper(fd, file, on, &client->fasync);

      return retval < 0 ? retval : 0;
}

static void mousedev_free(struct device *dev)
{
      struct mousedev *mousedev = container_of(dev, struct mousedev, dev);

      kfree(mousedev);
}

static int mousedev_open_device(struct mousedev *mousedev)
{
      int retval;

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

      if (mousedev->minor == MOUSEDEV_MIX)
            mixdev_open_devices();
      else if (!mousedev->exist)
            retval = -ENODEV;
      else if (!mousedev->open++) {
            retval = input_open_device(&mousedev->handle);
            if (retval)
                  mousedev->open--;
      }

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

static void mousedev_close_device(struct mousedev *mousedev)
{
      mutex_lock(&mousedev->mutex);

      if (mousedev->minor == MOUSEDEV_MIX)
            mixdev_close_devices();
      else if (mousedev->exist && !--mousedev->open)
            input_close_device(&mousedev->handle);

      mutex_unlock(&mousedev->mutex);
}

/*
 * Open all available devices so they can all be multiplexed in one.
 * stream. Note that this function is called with mousedev_mix->mutex
 * held.
 */
static void mixdev_open_devices(void)
{
      struct mousedev *mousedev;

      if (mousedev_mix->open++)
            return;

      list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
            if (!mousedev->mixdev_open) {
                  if (mousedev_open_device(mousedev))
                        continue;

                  mousedev->mixdev_open = 1;
            }
      }
}

/*
 * Close all devices that were opened as part of multiplexed
 * device. Note that this function is called with mousedev_mix->mutex
 * held.
 */
static void mixdev_close_devices(void)
{
      struct mousedev *mousedev;

      if (--mousedev_mix->open)
            return;

      list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
            if (mousedev->mixdev_open) {
                  mousedev->mixdev_open = 0;
                  mousedev_close_device(mousedev);
            }
      }
}


static void mousedev_attach_client(struct mousedev *mousedev,
                           struct mousedev_client *client)
{
      spin_lock(&mousedev->client_lock);
      list_add_tail_rcu(&client->node, &mousedev->client_list);
      spin_unlock(&mousedev->client_lock);
      synchronize_rcu();
}

static void mousedev_detach_client(struct mousedev *mousedev,
                           struct mousedev_client *client)
{
      spin_lock(&mousedev->client_lock);
      list_del_rcu(&client->node);
      spin_unlock(&mousedev->client_lock);
      synchronize_rcu();
}

static int mousedev_release(struct inode *inode, struct file *file)
{
      struct mousedev_client *client = file->private_data;
      struct mousedev *mousedev = client->mousedev;

      mousedev_fasync(-1, file, 0);
      mousedev_detach_client(mousedev, client);
      kfree(client);

      mousedev_close_device(mousedev);
      put_device(&mousedev->dev);

      return 0;
}

static int mousedev_open(struct inode *inode, struct file *file)
{
      struct mousedev_client *client;
      struct mousedev *mousedev;
      int error;
      int i;

#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
      if (imajor(inode) == MISC_MAJOR)
            i = MOUSEDEV_MIX;
      else
#endif
            i = iminor(inode) - MOUSEDEV_MINOR_BASE;

      if (i >= MOUSEDEV_MINORS)
            return -ENODEV;

      error = mutex_lock_interruptible(&mousedev_table_mutex);
      if (error)
            return error;
      mousedev = mousedev_table[i];
      if (mousedev)
            get_device(&mousedev->dev);
      mutex_unlock(&mousedev_table_mutex);

      if (!mousedev)
            return -ENODEV;

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

      spin_lock_init(&client->packet_lock);
      client->pos_x = xres / 2;
      client->pos_y = yres / 2;
      client->mousedev = mousedev;
      mousedev_attach_client(mousedev, client);

      error = mousedev_open_device(mousedev);
      if (error)
            goto err_free_client;

      file->private_data = client;
      return 0;

 err_free_client:
      mousedev_detach_client(mousedev, client);
      kfree(client);
 err_put_mousedev:
      put_device(&mousedev->dev);
      return error;
}

static inline int mousedev_limit_delta(int delta, int limit)
{
      return delta > limit ? limit : (delta < -limit ? -limit : delta);
}

static void mousedev_packet(struct mousedev_client *client,
                      signed char *ps2_data)
{
      struct mousedev_motion *p = &client->packets[client->tail];

      ps2_data[0] = 0x08 |
            ((p->dx < 0) << 4) | ((p->dy < 0) << 5) | (p->buttons & 0x07);
      ps2_data[1] = mousedev_limit_delta(p->dx, 127);
      ps2_data[2] = mousedev_limit_delta(p->dy, 127);
      p->dx -= ps2_data[1];
      p->dy -= ps2_data[2];

      switch (client->mode) {
      case MOUSEDEV_EMUL_EXPS:
            ps2_data[3] = mousedev_limit_delta(p->dz, 7);
            p->dz -= ps2_data[3];
            ps2_data[3] = (ps2_data[3] & 0x0f) | ((p->buttons & 0x18) << 1);
            client->bufsiz = 4;
            break;

      case MOUSEDEV_EMUL_IMPS:
            ps2_data[0] |=
                  ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
            ps2_data[3] = mousedev_limit_delta(p->dz, 127);
            p->dz -= ps2_data[3];
            client->bufsiz = 4;
            break;

      case MOUSEDEV_EMUL_PS2:
      default:
            ps2_data[0] |=
                  ((p->buttons & 0x10) >> 3) | ((p->buttons & 0x08) >> 1);
            p->dz = 0;
            client->bufsiz = 3;
            break;
      }

      if (!p->dx && !p->dy && !p->dz) {
            if (client->tail == client->head) {
                  client->ready = 0;
                  client->last_buttons = p->buttons;
            } else
                  client->tail = (client->tail + 1) % PACKET_QUEUE_LEN;
      }
}

static void mousedev_generate_response(struct mousedev_client *client,
                              int command)
{
      client->ps2[0] = 0xfa; /* ACK */

      switch (command) {

      case 0xeb: /* Poll */
            mousedev_packet(client, &client->ps2[1]);
            client->bufsiz++; /* account for leading ACK */
            break;

      case 0xf2: /* Get ID */
            switch (client->mode) {
            case MOUSEDEV_EMUL_PS2:
                  client->ps2[1] = 0;
                  break;
            case MOUSEDEV_EMUL_IMPS:
                  client->ps2[1] = 3;
                  break;
            case MOUSEDEV_EMUL_EXPS:
                  client->ps2[1] = 4;
                  break;
            }
            client->bufsiz = 2;
            break;

      case 0xe9: /* Get info */
            client->ps2[1] = 0x60; client->ps2[2] = 3; client->ps2[3] = 200;
            client->bufsiz = 4;
            break;

      case 0xff: /* Reset */
            client->impsseq = client->imexseq = 0;
            client->mode = MOUSEDEV_EMUL_PS2;
            client->ps2[1] = 0xaa; client->ps2[2] = 0x00;
            client->bufsiz = 3;
            break;

      default:
            client->bufsiz = 1;
            break;
      }
      client->buffer = client->bufsiz;
}

static ssize_t mousedev_write(struct file *file, const char __user *buffer,
                        size_t count, loff_t *ppos)
{
      struct mousedev_client *client = file->private_data;
      unsigned char c;
      unsigned int i;

      for (i = 0; i < count; i++) {

            if (get_user(c, buffer + i))
                  return -EFAULT;

            spin_lock_irq(&client->packet_lock);

            if (c == mousedev_imex_seq[client->imexseq]) {
                  if (++client->imexseq == MOUSEDEV_SEQ_LEN) {
                        client->imexseq = 0;
                        client->mode = MOUSEDEV_EMUL_EXPS;
                  }
            } else
                  client->imexseq = 0;

            if (c == mousedev_imps_seq[client->impsseq]) {
                  if (++client->impsseq == MOUSEDEV_SEQ_LEN) {
                        client->impsseq = 0;
                        client->mode = MOUSEDEV_EMUL_IMPS;
                  }
            } else
                  client->impsseq = 0;

            mousedev_generate_response(client, c);

            spin_unlock_irq(&client->packet_lock);
      }

      kill_fasync(&client->fasync, SIGIO, POLL_IN);
      wake_up_interruptible(&client->mousedev->wait);

      return count;
}

static ssize_t mousedev_read(struct file *file, char __user *buffer,
                       size_t count, loff_t *ppos)
{
      struct mousedev_client *client = file->private_data;
      struct mousedev *mousedev = client->mousedev;
      signed char data[sizeof(client->ps2)];
      int retval = 0;

      if (!client->ready && !client->buffer && mousedev->exist &&
          (file->f_flags & O_NONBLOCK))
            return -EAGAIN;

      retval = wait_event_interruptible(mousedev->wait,
                  !mousedev->exist || client->ready || client->buffer);
      if (retval)
            return retval;

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

      spin_lock_irq(&client->packet_lock);

      if (!client->buffer && client->ready) {
            mousedev_packet(client, client->ps2);
            client->buffer = client->bufsiz;
      }

      if (count > client->buffer)
            count = client->buffer;

      memcpy(data, client->ps2 + client->bufsiz - client->buffer, count);
      client->buffer -= count;

      spin_unlock_irq(&client->packet_lock);

      if (copy_to_user(buffer, data, count))
            return -EFAULT;

      return count;
}

/* No kernel lock - fine */
static unsigned int mousedev_poll(struct file *file, poll_table *wait)
{
      struct mousedev_client *client = file->private_data;
      struct mousedev *mousedev = client->mousedev;

      poll_wait(file, &mousedev->wait, wait);
      return ((client->ready || client->buffer) ? (POLLIN | POLLRDNORM) : 0) |
            (mousedev->exist ? 0 : (POLLHUP | POLLERR));
}

static const struct file_operations mousedev_fops = {
      .owner =    THIS_MODULE,
      .read =           mousedev_read,
      .write =    mousedev_write,
      .poll =           mousedev_poll,
      .open =           mousedev_open,
      .release =  mousedev_release,
      .fasync =   mousedev_fasync,
};

static int mousedev_install_chrdev(struct mousedev *mousedev)
{
      mousedev_table[mousedev->minor] = mousedev;
      return 0;
}

static void mousedev_remove_chrdev(struct mousedev *mousedev)
{
      mutex_lock(&mousedev_table_mutex);
      mousedev_table[mousedev->minor] = NULL;
      mutex_unlock(&mousedev_table_mutex);
}

/*
 * Mark device non-existent. 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 mousedev_mark_dead(struct mousedev *mousedev)
{
      mutex_lock(&mousedev->mutex);
      mousedev->exist = 0;
      mutex_unlock(&mousedev->mutex);
}

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

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

      wake_up_interruptible(&mousedev->wait);
}

static void mousedev_cleanup(struct mousedev *mousedev)
{
      struct input_handle *handle = &mousedev->handle;

      mousedev_mark_dead(mousedev);
      mousedev_hangup(mousedev);
      mousedev_remove_chrdev(mousedev);

      /* mousedev is marked dead so no one else accesses mousedev->open */
      if (mousedev->open)
            input_close_device(handle);
}

static struct mousedev *mousedev_create(struct input_dev *dev,
                              struct input_handler *handler,
                              int minor)
{
      struct mousedev *mousedev;
      int error;

      mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL);
      if (!mousedev) {
            error = -ENOMEM;
            goto err_out;
      }

      INIT_LIST_HEAD(&mousedev->client_list);
      INIT_LIST_HEAD(&mousedev->mixdev_node);
      spin_lock_init(&mousedev->client_lock);
      mutex_init(&mousedev->mutex);
      lockdep_set_subclass(&mousedev->mutex,
                       minor == MOUSEDEV_MIX ? MOUSEDEV_MIX : 0);
      init_waitqueue_head(&mousedev->wait);

      if (minor == MOUSEDEV_MIX)
            strlcpy(mousedev->name, "mice", sizeof(mousedev->name));
      else
            snprintf(mousedev->name, sizeof(mousedev->name),
                   "mouse%d", minor);

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

      strlcpy(mousedev->dev.bus_id, mousedev->name,
            sizeof(mousedev->dev.bus_id));
      mousedev->dev.class = &input_class;
      if (dev)
            mousedev->dev.parent = &dev->dev;
      mousedev->dev.devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor);
      mousedev->dev.release = mousedev_free;
      device_initialize(&mousedev->dev);

      if (minor != MOUSEDEV_MIX) {
            error = input_register_handle(&mousedev->handle);
            if (error)
                  goto err_free_mousedev;
      }

      error = mousedev_install_chrdev(mousedev);
      if (error)
            goto err_unregister_handle;

      error = device_add(&mousedev->dev);
      if (error)
            goto err_cleanup_mousedev;

      return mousedev;

 err_cleanup_mousedev:
      mousedev_cleanup(mousedev);
 err_unregister_handle:
      if (minor != MOUSEDEV_MIX)
            input_unregister_handle(&mousedev->handle);
 err_free_mousedev:
      put_device(&mousedev->dev);
 err_out:
      return ERR_PTR(error);
}

static void mousedev_destroy(struct mousedev *mousedev)
{
      device_del(&mousedev->dev);
      mousedev_cleanup(mousedev);
      if (mousedev->minor != MOUSEDEV_MIX)
            input_unregister_handle(&mousedev->handle);
      put_device(&mousedev->dev);
}

static int mixdev_add_device(struct mousedev *mousedev)
{
      int retval;

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

      if (mousedev_mix->open) {
            retval = mousedev_open_device(mousedev);
            if (retval)
                  goto out;

            mousedev->mixdev_open = 1;
      }

      get_device(&mousedev->dev);
      list_add_tail(&mousedev->mixdev_node, &mousedev_mix_list);

 out:
      mutex_unlock(&mousedev_mix->mutex);
      return retval;
}

static void mixdev_remove_device(struct mousedev *mousedev)
{
      mutex_lock(&mousedev_mix->mutex);

      if (mousedev->mixdev_open) {
            mousedev->mixdev_open = 0;
            mousedev_close_device(mousedev);
      }

      list_del_init(&mousedev->mixdev_node);
      mutex_unlock(&mousedev_mix->mutex);

      put_device(&mousedev->dev);
}

static int mousedev_connect(struct input_handler *handler,
                      struct input_dev *dev,
                      const struct input_device_id *id)
{
      struct mousedev *mousedev;
      int minor;
      int error;

      for (minor = 0; minor < MOUSEDEV_MINORS; minor++)
            if (!mousedev_table[minor])
                  break;

      if (minor == MOUSEDEV_MINORS) {
            printk(KERN_ERR "mousedev: no more free mousedev devices\n");
            return -ENFILE;
      }

      mousedev = mousedev_create(dev, handler, minor);
      if (IS_ERR(mousedev))
            return PTR_ERR(mousedev);

      error = mixdev_add_device(mousedev);
      if (error) {
            mousedev_destroy(mousedev);
            return error;
      }

      return 0;
}

static void mousedev_disconnect(struct input_handle *handle)
{
      struct mousedev *mousedev = handle->private;

      mixdev_remove_device(mousedev);
      mousedev_destroy(mousedev);
}

static const struct input_device_id mousedev_ids[] = {
      {
            .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
                        INPUT_DEVICE_ID_MATCH_KEYBIT |
                        INPUT_DEVICE_ID_MATCH_RELBIT,
            .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
            .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
            .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) },
      },    /* A mouse like device, at least one button,
               two relative axes */
      {
            .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
                        INPUT_DEVICE_ID_MATCH_RELBIT,
            .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
            .relbit = { BIT_MASK(REL_WHEEL) },
      },    /* A separate scrollwheel */
      {
            .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
                        INPUT_DEVICE_ID_MATCH_KEYBIT |
                        INPUT_DEVICE_ID_MATCH_ABSBIT,
            .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
            .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
            .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
      },    /* A tablet like device, at least touch detection,
               two absolute axes */
      {
            .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
                        INPUT_DEVICE_ID_MATCH_KEYBIT |
                        INPUT_DEVICE_ID_MATCH_ABSBIT,
            .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
            .keybit = { [BIT_WORD(BTN_TOOL_FINGER)] =
                        BIT_MASK(BTN_TOOL_FINGER) },
            .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) |
                        BIT_MASK(ABS_PRESSURE) |
                        BIT_MASK(ABS_TOOL_WIDTH) },
      },    /* A touchpad */
      {
            .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
                  INPUT_DEVICE_ID_MATCH_KEYBIT |
                  INPUT_DEVICE_ID_MATCH_ABSBIT,
            .evbit = { BIT(EV_KEY) | BIT(EV_ABS) | BIT(EV_SYN) },
            .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
            .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
      },    /* Mouse-like device with absolute X and Y but ordinary
               clicks, like hp ILO2 High Performance mouse */

      { },  /* Terminating entry */
};

MODULE_DEVICE_TABLE(input, mousedev_ids);

static struct input_handler mousedev_handler = {
      .event =    mousedev_event,
      .connect =  mousedev_connect,
      .disconnect =     mousedev_disconnect,
      .fops =           &mousedev_fops,
      .minor =    MOUSEDEV_MINOR_BASE,
      .name =           "mousedev",
      .id_table = mousedev_ids,
};

#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
static struct miscdevice psaux_mouse = {
      PSMOUSE_MINOR, "psaux", &mousedev_fops
};
static int psaux_registered;
#endif

static int __init mousedev_init(void)
{
      int error;

      mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX);
      if (IS_ERR(mousedev_mix))
            return PTR_ERR(mousedev_mix);

      error = input_register_handler(&mousedev_handler);
      if (error) {
            mousedev_destroy(mousedev_mix);
            return error;
      }

#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
      error = misc_register(&psaux_mouse);
      if (error)
            printk(KERN_WARNING "mice: could not register psaux device, "
                  "error: %d\n", error);
      else
            psaux_registered = 1;
#endif

      printk(KERN_INFO "mice: PS/2 mouse device common for all mice\n");

      return 0;
}

static void __exit mousedev_exit(void)
{
#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
      if (psaux_registered)
            misc_deregister(&psaux_mouse);
#endif
      input_unregister_handler(&mousedev_handler);
      mousedev_destroy(mousedev_mix);
}

module_init(mousedev_init);
module_exit(mousedev_exit);

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