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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/config.h>
#include <linux/smp_lock.h>
#include <linux/random.h>
#include <linux/major.h>
#include <linux/device.h>
#include <linux/devfs_fs_kernel.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 - 2.6.7-pc-0.1");
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, 0);
MODULE_PARM_DESC(xres, "Horizontal screen resolution");

static int yres = CONFIG_INPUT_MOUSEDEV_SCREEN_Y;
module_param(yres, uint, 0);
MODULE_PARM_DESC(yres, "Vertical screen resolution");

struct mousedev_motion {
      int dx, dy, dz;
};

struct mousedev {
      int exist;
      int open;
      int minor;
      char name[16];
      wait_queue_head_t wait;
      struct list_head list;
      struct input_handle handle;

      struct mousedev_motion packet;
      unsigned long buttons;
      unsigned int pkt_count;
      int old_x[4], old_y[4];
      unsigned int touch;
};

struct mousedev_list {
      struct fasync_struct *fasync;
      struct mousedev *mousedev;
      struct list_head node;
      int dx, dy, dz;
      unsigned long buttons;
      signed char ps2[6];
      unsigned char ready, buffer, bufsiz;
      unsigned char mode, imexseq, impsseq;
};

#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 struct mousedev mousedev_mix;

#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 mousedev *mousedev, unsigned int code, int value)
{
      if (mousedev->touch) {
            switch (code) {
                  case ABS_X:
                        fx(0) = value;
                        if (mousedev->pkt_count >= 2)
                              mousedev->packet.dx = ((fx(0) - fx(1)) / 2 + (fx(1) - fx(2)) / 2) / 8;
                        break;

                  case ABS_Y:
                        fy(0) = value;
                        if (mousedev->pkt_count >= 2)
                              mousedev->packet.dy = -((fy(0) - fy(1)) / 2 + (fy(1) - fy(2)) / 2) / 8;
                        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;
                  mousedev->packet.dx = (value * xres - mousedev->old_x[0]) / size;
                  mousedev->old_x[0] = mousedev->packet.dx * size;
                  break;

            case ABS_Y:
                  size = dev->absmax[ABS_Y] - dev->absmin[ABS_Y];
                  if (size == 0) size = yres;
                  mousedev->packet.dy = (value * yres - mousedev->old_y[0]) / size;
                  mousedev->old_y[0] = mousedev->packet.dy * size;
                  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_FORWARD:
            case BTN_LEFT:          index = 0; break;
            case BTN_STYLUS:
            case BTN_1:
            case BTN_RIGHT:         index = 1; break;
            case BTN_2:
            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->buttons);
            set_bit(index, &mousedev_mix.buttons);
      } else {
            clear_bit(index, &mousedev->buttons);
            clear_bit(index, &mousedev_mix.buttons);
      }
}

static void mousedev_notify_readers(struct mousedev *mousedev, struct mousedev_motion *packet)
{
      struct mousedev_list *list;

      list_for_each_entry(list, &mousedev->list, node) {
            list->dx += packet->dx;
            list->dy += packet->dy;
            list->dz += packet->dz;
            list->buttons = mousedev->buttons;
            list->ready = 1;
            kill_fasync(&list->fasync, SIGIO, POLL_IN);
      }

      wake_up_interruptible(&mousedev->wait);
}

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(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)) {
                              /* Handle touchpad data */
                              mousedev->touch = value;
                              if (!mousedev->touch)
                                    mousedev->pkt_count = 0;
                        }
                        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);

                        memset(&mousedev->packet, 0, sizeof(struct mousedev_motion));
                  }
                  break;
      }
}

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

static void mousedev_free(struct mousedev *mousedev)
{
      devfs_remove("input/mouse%d", mousedev->minor);
      class_simple_device_remove(MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + mousedev->minor));
      mousedev_table[mousedev->minor] = NULL;
      kfree(mousedev);
}

static int mixdev_release(void)
{
      struct input_handle *handle;

      list_for_each_entry(handle, &mousedev_handler.h_list, h_node) {
            struct mousedev *mousedev = handle->private;

            if (!mousedev->open) {
                  if (mousedev->exist)
                        input_close_device(&mousedev->handle);
                  else
                        mousedev_free(mousedev);
            }
      }

      return 0;
}

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

      mousedev_fasync(-1, file, 0);

      list_del(&list->node);

      if (!--list->mousedev->open) {
            if (list->mousedev->minor == MOUSEDEV_MIX)
                  return mixdev_release();

            if (!mousedev_mix.open) {
                  if (list->mousedev->exist)
                        input_close_device(&list->mousedev->handle);
                  else
                        mousedev_free(list->mousedev);
            }
      }

      kfree(list);
      return 0;
}

static int mousedev_open(struct inode * inode, struct file * file)
{
      struct mousedev_list *list;
      struct input_handle *handle;
      struct mousedev *mousedev;
      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 || !mousedev_table[i])
            return -ENODEV;

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

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

      if (!list->mousedev->open++) {
            if (list->mousedev->minor == MOUSEDEV_MIX) {
                  list_for_each_entry(handle, &mousedev_handler.h_list, h_node) {
                        mousedev = handle->private;
                        if (!mousedev->open && mousedev->exist)
                              input_open_device(handle);
                  }
            } else
                  if (!mousedev_mix.open && list->mousedev->exist)
                        input_open_device(&list->mousedev->handle);
      }

      return 0;
}

static void mousedev_packet(struct mousedev_list *list, unsigned char off)
{
      list->ps2[off] = 0x08 | ((list->dx < 0) << 4) | ((list->dy < 0) << 5) | (list->buttons & 0x07);
      list->ps2[off + 1] = (list->dx > 127 ? 127 : (list->dx < -127 ? -127 : list->dx));
      list->ps2[off + 2] = (list->dy > 127 ? 127 : (list->dy < -127 ? -127 : list->dy));
      list->dx -= list->ps2[off + 1];
      list->dy -= list->ps2[off + 2];
      list->bufsiz = off + 3;

      if (list->mode == 2) {
            list->ps2[off + 3] = (list->dz > 7 ? 7 : (list->dz < -7 ? -7 : list->dz));
            list->dz -= list->ps2[off + 3];
            list->ps2[off + 3] = (list->ps2[off + 3] & 0x0f) | ((list->buttons & 0x18) << 1);
            list->bufsiz++;
      } else {
            list->ps2[off] |= ((list->buttons & 0x10) >> 3) | ((list->buttons & 0x08) >> 1);
      }

      if (list->mode == 1) {
            list->ps2[off + 3] = (list->dz > 127 ? 127 : (list->dz < -127 ? -127 : list->dz));
            list->dz -= list->ps2[off + 3];
            list->bufsiz++;
      }

      if (!list->dx && !list->dy && (!list->mode || !list->dz)) list->ready = 0;
      list->buffer = list->bufsiz;
}


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

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

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

            if (c == mousedev_imex_seq[list->imexseq]) {
                  if (++list->imexseq == MOUSEDEV_SEQ_LEN) {
                        list->imexseq = 0;
                        list->mode = 2;
                  }
            } else list->imexseq = 0;

            if (c == mousedev_imps_seq[list->impsseq]) {
                  if (++list->impsseq == MOUSEDEV_SEQ_LEN) {
                        list->impsseq = 0;
                        list->mode = 1;
                  }
            } else list->impsseq = 0;

            list->ps2[0] = 0xfa;
            list->bufsiz = 1;

            switch (c) {

                  case 0xeb: /* Poll */
                        mousedev_packet(list, 1);
                        break;

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

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

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

            list->buffer = list->bufsiz;
      }

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

      wake_up_interruptible(&list->mousedev->wait);

      return count;
}

static ssize_t mousedev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
{
      struct mousedev_list *list = file->private_data;
      int retval = 0;

      if (!list->ready && !list->buffer && (file->f_flags & O_NONBLOCK))
            return -EAGAIN;

      retval = wait_event_interruptible(list->mousedev->wait, list->ready || list->buffer);

      if (retval)
            return retval;

      if (!list->buffer && list->ready)
            mousedev_packet(list, 0);

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

      list->buffer -= count;

      if (copy_to_user(buffer, list->ps2 + list->bufsiz - list->buffer - count, count))
            return -EFAULT;

      return count;
}

/* No kernel lock - fine */
static unsigned int mousedev_poll(struct file *file, poll_table *wait)
{
      struct mousedev_list *list = file->private_data;
      poll_wait(file, &list->mousedev->wait, wait);
      if (list->ready || list->buffer)
            return POLLIN | POLLRDNORM;
      return 0;
}

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 struct input_handle *mousedev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
{
      struct mousedev *mousedev;
      int minor = 0;

      /* Ignore all wacom tablets */
      if (dev->id.vendor == 0x56a) return NULL;

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

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

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

      mousedev->minor = minor;
      mousedev->exist = 1;
      mousedev->handle.dev = dev;
      mousedev->handle.name = mousedev->name;
      mousedev->handle.handler = handler;
      mousedev->handle.private = mousedev;
      sprintf(mousedev->name, "mouse%d", minor);

      if (mousedev_mix.open)
            input_open_device(&mousedev->handle);

      mousedev_table[minor] = mousedev;

      devfs_mk_cdev(MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor),
                  S_IFCHR|S_IRUGO|S_IWUSR, "input/mouse%d", minor);
      class_simple_device_add(input_class,
                        MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor),
                        dev->dev, "mouse%d", minor);

      return &mousedev->handle;
}

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

      mousedev->exist = 0;

      if (mousedev->open) {
            input_close_device(handle);
      } else {
            if (mousedev_mix.open)
                  input_close_device(handle);
            mousedev_free(mousedev);
      }
}

static struct input_device_id mousedev_ids[] = {
      {
            .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_RELBIT,
            .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
            .keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) },
            .relbit = { BIT(REL_X) | BIT(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(EV_KEY) | BIT(EV_REL) },
            .relbit = { BIT(REL_WHEEL) },
      },    /* A separate scrollwheel */
      {
            .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
            .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
            .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
            .absbit = { BIT(ABS_X) | BIT(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(EV_KEY) | BIT(EV_ABS) },
            .keybit = { [LONG(BTN_TOOL_FINGER)] = BIT(BTN_TOOL_FINGER) },
            .absbit = { BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE) | BIT(ABS_TOOL_WIDTH) },
      },    /* A touchpad */

      { },  /* 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)
{
      input_register_handler(&mousedev_handler);

      memset(&mousedev_mix, 0, sizeof(struct mousedev));
      INIT_LIST_HEAD(&mousedev_mix.list);
      init_waitqueue_head(&mousedev_mix.wait);
      mousedev_table[MOUSEDEV_MIX] = &mousedev_mix;
      mousedev_mix.exist = 1;
      mousedev_mix.minor = MOUSEDEV_MIX;

      devfs_mk_cdev(MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX),
                  S_IFCHR|S_IRUGO|S_IWUSR, "input/mice");
      class_simple_device_add(input_class, MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX),
                        NULL, "mice");

#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
      if (!(psaux_registered = !misc_register(&psaux_mouse)))
            printk(KERN_WARNING "mice: could not misc_register the device\n");
#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
      devfs_remove("input/mice");
      class_simple_device_remove(MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + MOUSEDEV_MIX));
      input_unregister_handler(&mousedev_handler);
}

module_init(mousedev_init);
module_exit(mousedev_exit);

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