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psmouse-base.c

/*
 * PS/2 mouse driver
 *
 * Copyright (c) 1999-2002 Vojtech Pavlik
 * Copyright (c) 2003-2004 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.
 */

#include <linux/delay.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/init.h>
#include <linux/libps2.h>
#include <linux/mutex.h>

#include "psmouse.h"
#include "synaptics.h"
#include "logips2pp.h"
#include "alps.h"
#include "lifebook.h"
#include "trackpoint.h"
#include "touchkit_ps2.h"

#define DRIVER_DESC     "PS/2 mouse driver"

MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

static unsigned int psmouse_max_proto = PSMOUSE_AUTO;
static int psmouse_set_maxproto(const char *val, struct kernel_param *kp);
static int psmouse_get_maxproto(char *buffer, struct kernel_param *kp);
#define param_check_proto_abbrev(name, p) __param_check(name, p, unsigned int)
#define param_set_proto_abbrev                  psmouse_set_maxproto
#define param_get_proto_abbrev                  psmouse_get_maxproto
module_param_named(proto, psmouse_max_proto, proto_abbrev, 0644);
MODULE_PARM_DESC(proto, "Highest protocol extension to probe (bare, imps, exps, any). Useful for KVM switches.");

static unsigned int psmouse_resolution = 200;
module_param_named(resolution, psmouse_resolution, uint, 0644);
MODULE_PARM_DESC(resolution, "Resolution, in dpi.");

static unsigned int psmouse_rate = 100;
module_param_named(rate, psmouse_rate, uint, 0644);
MODULE_PARM_DESC(rate, "Report rate, in reports per second.");

static unsigned int psmouse_smartscroll = 1;
module_param_named(smartscroll, psmouse_smartscroll, bool, 0644);
MODULE_PARM_DESC(smartscroll, "Logitech Smartscroll autorepeat, 1 = enabled (default), 0 = disabled.");

static unsigned int psmouse_resetafter = 5;
module_param_named(resetafter, psmouse_resetafter, uint, 0644);
MODULE_PARM_DESC(resetafter, "Reset device after so many bad packets (0 = never).");

static unsigned int psmouse_resync_time;
module_param_named(resync_time, psmouse_resync_time, uint, 0644);
MODULE_PARM_DESC(resync_time, "How long can mouse stay idle before forcing resync (in seconds, 0 = never).");

PSMOUSE_DEFINE_ATTR(protocol, S_IWUSR | S_IRUGO,
                  NULL,
                  psmouse_attr_show_protocol, psmouse_attr_set_protocol);
PSMOUSE_DEFINE_ATTR(rate, S_IWUSR | S_IRUGO,
                  (void *) offsetof(struct psmouse, rate),
                  psmouse_show_int_attr, psmouse_attr_set_rate);
PSMOUSE_DEFINE_ATTR(resolution, S_IWUSR | S_IRUGO,
                  (void *) offsetof(struct psmouse, resolution),
                  psmouse_show_int_attr, psmouse_attr_set_resolution);
PSMOUSE_DEFINE_ATTR(resetafter, S_IWUSR | S_IRUGO,
                  (void *) offsetof(struct psmouse, resetafter),
                  psmouse_show_int_attr, psmouse_set_int_attr);
PSMOUSE_DEFINE_ATTR(resync_time, S_IWUSR | S_IRUGO,
                  (void *) offsetof(struct psmouse, resync_time),
                  psmouse_show_int_attr, psmouse_set_int_attr);

static struct attribute *psmouse_attributes[] = {
      &psmouse_attr_protocol.dattr.attr,
      &psmouse_attr_rate.dattr.attr,
      &psmouse_attr_resolution.dattr.attr,
      &psmouse_attr_resetafter.dattr.attr,
      &psmouse_attr_resync_time.dattr.attr,
      NULL
};

static struct attribute_group psmouse_attribute_group = {
      .attrs      = psmouse_attributes,
};

/*
 * psmouse_mutex protects all operations changing state of mouse
 * (connecting, disconnecting, changing rate or resolution via
 * sysfs). We could use a per-device semaphore but since there
 * rarely more than one PS/2 mouse connected and since semaphore
 * is taken in "slow" paths it is not worth it.
 */
static DEFINE_MUTEX(psmouse_mutex);

static struct workqueue_struct *kpsmoused_wq;

struct psmouse_protocol {
      enum psmouse_type type;
      const char *name;
      const char *alias;
      int maxproto;
      int (*detect)(struct psmouse *, int);
      int (*init)(struct psmouse *);
};

/*
 * psmouse_process_byte() analyzes the PS/2 data stream and reports
 * relevant events to the input module once full packet has arrived.
 */

static psmouse_ret_t psmouse_process_byte(struct psmouse *psmouse)
{
      struct input_dev *dev = psmouse->dev;
      unsigned char *packet = psmouse->packet;

      if (psmouse->pktcnt < psmouse->pktsize)
            return PSMOUSE_GOOD_DATA;

/*
 * Full packet accumulated, process it
 */

/*
 * Scroll wheel on IntelliMice, scroll buttons on NetMice
 */

      if (psmouse->type == PSMOUSE_IMPS || psmouse->type == PSMOUSE_GENPS)
            input_report_rel(dev, REL_WHEEL, -(signed char) packet[3]);

/*
 * Scroll wheel and buttons on IntelliMouse Explorer
 */

      if (psmouse->type == PSMOUSE_IMEX) {
            switch (packet[3] & 0xC0) {
                  case 0x80: /* vertical scroll on IntelliMouse Explorer 4.0 */
                        input_report_rel(dev, REL_WHEEL, (int) (packet[3] & 32) - (int) (packet[3] & 31));
                        break;
                  case 0x40: /* horizontal scroll on IntelliMouse Explorer 4.0 */
                        input_report_rel(dev, REL_HWHEEL, (int) (packet[3] & 32) - (int) (packet[3] & 31));
                        break;
                  case 0x00:
                  case 0xC0:
                        input_report_rel(dev, REL_WHEEL, (int) (packet[3] & 8) - (int) (packet[3] & 7));
                        input_report_key(dev, BTN_SIDE, (packet[3] >> 4) & 1);
                        input_report_key(dev, BTN_EXTRA, (packet[3] >> 5) & 1);
                        break;
            }
      }

/*
 * Extra buttons on Genius NewNet 3D
 */

      if (psmouse->type == PSMOUSE_GENPS) {
            input_report_key(dev, BTN_SIDE, (packet[0] >> 6) & 1);
            input_report_key(dev, BTN_EXTRA, (packet[0] >> 7) & 1);
      }

/*
 * Extra button on ThinkingMouse
 */
      if (psmouse->type == PSMOUSE_THINKPS) {
            input_report_key(dev, BTN_EXTRA, (packet[0] >> 3) & 1);
            /* Without this bit of weirdness moving up gives wildly high Y changes. */
            packet[1] |= (packet[0] & 0x40) << 1;
      }

/*
 * Cortron PS2 Trackball reports SIDE button on the 4th bit of the first
 * byte.
 */
      if (psmouse->type == PSMOUSE_CORTRON) {
            input_report_key(dev, BTN_SIDE, (packet[0] >> 3) & 1);
            packet[0] |= 0x08;
      }

/*
 * Generic PS/2 Mouse
 */

      input_report_key(dev, BTN_LEFT,    packet[0]       & 1);
      input_report_key(dev, BTN_MIDDLE, (packet[0] >> 2) & 1);
      input_report_key(dev, BTN_RIGHT,  (packet[0] >> 1) & 1);

      input_report_rel(dev, REL_X, packet[1] ? (int) packet[1] - (int) ((packet[0] << 4) & 0x100) : 0);
      input_report_rel(dev, REL_Y, packet[2] ? (int) ((packet[0] << 3) & 0x100) - (int) packet[2] : 0);

      input_sync(dev);

      return PSMOUSE_FULL_PACKET;
}

/*
 * __psmouse_set_state() sets new psmouse state and resets all flags.
 */

static inline void __psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
{
      psmouse->state = new_state;
      psmouse->pktcnt = psmouse->out_of_sync = 0;
      psmouse->ps2dev.flags = 0;
      psmouse->last = jiffies;
}


/*
 * psmouse_set_state() sets new psmouse state and resets all flags and
 * counters while holding serio lock so fighting with interrupt handler
 * is not a concern.
 */

static void psmouse_set_state(struct psmouse *psmouse, enum psmouse_state new_state)
{
      serio_pause_rx(psmouse->ps2dev.serio);
      __psmouse_set_state(psmouse, new_state);
      serio_continue_rx(psmouse->ps2dev.serio);
}

/*
 * psmouse_handle_byte() processes one byte of the input data stream
 * by calling corresponding protocol handler.
 */

static int psmouse_handle_byte(struct psmouse *psmouse)
{
      psmouse_ret_t rc = psmouse->protocol_handler(psmouse);

      switch (rc) {
            case PSMOUSE_BAD_DATA:
                  if (psmouse->state == PSMOUSE_ACTIVATED) {
                        printk(KERN_WARNING "psmouse.c: %s at %s lost sync at byte %d\n",
                              psmouse->name, psmouse->phys, psmouse->pktcnt);
                        if (++psmouse->out_of_sync == psmouse->resetafter) {
                              __psmouse_set_state(psmouse, PSMOUSE_IGNORE);
                              printk(KERN_NOTICE "psmouse.c: issuing reconnect request\n");
                              serio_reconnect(psmouse->ps2dev.serio);
                              return -1;
                        }
                  }
                  psmouse->pktcnt = 0;
                  break;

            case PSMOUSE_FULL_PACKET:
                  psmouse->pktcnt = 0;
                  if (psmouse->out_of_sync) {
                        psmouse->out_of_sync = 0;
                        printk(KERN_NOTICE "psmouse.c: %s at %s - driver resynched.\n",
                              psmouse->name, psmouse->phys);
                  }
                  break;

            case PSMOUSE_GOOD_DATA:
                  break;
      }
      return 0;
}

/*
 * psmouse_interrupt() handles incoming characters, either passing them
 * for normal processing or gathering them as command response.
 */

static irqreturn_t psmouse_interrupt(struct serio *serio,
            unsigned char data, unsigned int flags)
{
      struct psmouse *psmouse = serio_get_drvdata(serio);

      if (psmouse->state == PSMOUSE_IGNORE)
            goto out;

      if (flags & (SERIO_PARITY|SERIO_TIMEOUT)) {
            if (psmouse->state == PSMOUSE_ACTIVATED)
                  printk(KERN_WARNING "psmouse.c: bad data from KBC -%s%s\n",
                        flags & SERIO_TIMEOUT ? " timeout" : "",
                        flags & SERIO_PARITY ? " bad parity" : "");
            ps2_cmd_aborted(&psmouse->ps2dev);
            goto out;
      }

      if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_ACK))
            if  (ps2_handle_ack(&psmouse->ps2dev, data))
                  goto out;

      if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_CMD))
            if  (ps2_handle_response(&psmouse->ps2dev, data))
                  goto out;

      if (psmouse->state <= PSMOUSE_RESYNCING)
            goto out;

      if (psmouse->state == PSMOUSE_ACTIVATED &&
          psmouse->pktcnt && time_after(jiffies, psmouse->last + HZ/2)) {
            printk(KERN_INFO "psmouse.c: %s at %s lost synchronization, throwing %d bytes away.\n",
                   psmouse->name, psmouse->phys, psmouse->pktcnt);
            psmouse->badbyte = psmouse->packet[0];
            __psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
            queue_work(kpsmoused_wq, &psmouse->resync_work);
            goto out;
      }

      psmouse->packet[psmouse->pktcnt++] = data;
/*
 * Check if this is a new device announcement (0xAA 0x00)
 */
      if (unlikely(psmouse->packet[0] == PSMOUSE_RET_BAT && psmouse->pktcnt <= 2)) {
            if (psmouse->pktcnt == 1) {
                  psmouse->last = jiffies;
                  goto out;
            }

            if (psmouse->packet[1] == PSMOUSE_RET_ID) {
                  __psmouse_set_state(psmouse, PSMOUSE_IGNORE);
                  serio_reconnect(serio);
                  goto out;
            }
/*
 * Not a new device, try processing first byte normally
 */
            psmouse->pktcnt = 1;
            if (psmouse_handle_byte(psmouse))
                  goto out;

            psmouse->packet[psmouse->pktcnt++] = data;
      }

/*
 * See if we need to force resync because mouse was idle for too long
 */
      if (psmouse->state == PSMOUSE_ACTIVATED &&
          psmouse->pktcnt == 1 && psmouse->resync_time &&
          time_after(jiffies, psmouse->last + psmouse->resync_time * HZ)) {
            psmouse->badbyte = psmouse->packet[0];
            __psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
            queue_work(kpsmoused_wq, &psmouse->resync_work);
            goto out;
      }

      psmouse->last = jiffies;
      psmouse_handle_byte(psmouse);

 out:
      return IRQ_HANDLED;
}


/*
 * psmouse_sliced_command() sends an extended PS/2 command to the mouse
 * using sliced syntax, understood by advanced devices, such as Logitech
 * or Synaptics touchpads. The command is encoded as:
 * 0xE6 0xE8 rr 0xE8 ss 0xE8 tt 0xE8 uu where (rr*64)+(ss*16)+(tt*4)+uu
 * is the command.
 */
int psmouse_sliced_command(struct psmouse *psmouse, unsigned char command)
{
      int i;

      if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11))
            return -1;

      for (i = 6; i >= 0; i -= 2) {
            unsigned char d = (command >> i) & 3;
            if (ps2_command(&psmouse->ps2dev, &d, PSMOUSE_CMD_SETRES))
                  return -1;
      }

      return 0;
}


/*
 * psmouse_reset() resets the mouse into power-on state.
 */
int psmouse_reset(struct psmouse *psmouse)
{
      unsigned char param[2];

      if (ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_RESET_BAT))
            return -1;

      if (param[0] != PSMOUSE_RET_BAT && param[1] != PSMOUSE_RET_ID)
            return -1;

      return 0;
}


/*
 * Genius NetMouse magic init.
 */
static int genius_detect(struct psmouse *psmouse, int set_properties)
{
      struct ps2dev *ps2dev = &psmouse->ps2dev;
      unsigned char param[4];

      param[0] = 3;
      ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
      ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
      ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
      ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11);
      ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);

      if (param[0] != 0x00 || param[1] != 0x33 || param[2] != 0x55)
            return -1;

      if (set_properties) {
            set_bit(BTN_EXTRA, psmouse->dev->keybit);
            set_bit(BTN_SIDE, psmouse->dev->keybit);
            set_bit(REL_WHEEL, psmouse->dev->relbit);

            psmouse->vendor = "Genius";
            psmouse->name = "Mouse";
            psmouse->pktsize = 4;
      }

      return 0;
}

/*
 * IntelliMouse magic init.
 */
static int intellimouse_detect(struct psmouse *psmouse, int set_properties)
{
      struct ps2dev *ps2dev = &psmouse->ps2dev;
      unsigned char param[2];

      param[0] = 200;
      ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
      param[0] = 100;
      ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
      param[0] =  80;
      ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
      ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);

      if (param[0] != 3)
            return -1;

      if (set_properties) {
            set_bit(BTN_MIDDLE, psmouse->dev->keybit);
            set_bit(REL_WHEEL, psmouse->dev->relbit);

            if (!psmouse->vendor) psmouse->vendor = "Generic";
            if (!psmouse->name) psmouse->name = "Wheel Mouse";
            psmouse->pktsize = 4;
      }

      return 0;
}

/*
 * Try IntelliMouse/Explorer magic init.
 */
static int im_explorer_detect(struct psmouse *psmouse, int set_properties)
{
      struct ps2dev *ps2dev = &psmouse->ps2dev;
      unsigned char param[2];

      intellimouse_detect(psmouse, 0);

      param[0] = 200;
      ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
      param[0] = 200;
      ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
      param[0] =  80;
      ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
      ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);

      if (param[0] != 4)
            return -1;

/* Magic to enable horizontal scrolling on IntelliMouse 4.0 */
      param[0] = 200;
      ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
      param[0] =  80;
      ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
      param[0] =  40;
      ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);

      if (set_properties) {
            set_bit(BTN_MIDDLE, psmouse->dev->keybit);
            set_bit(REL_WHEEL, psmouse->dev->relbit);
            set_bit(REL_HWHEEL, psmouse->dev->relbit);
            set_bit(BTN_SIDE, psmouse->dev->keybit);
            set_bit(BTN_EXTRA, psmouse->dev->keybit);

            if (!psmouse->vendor) psmouse->vendor = "Generic";
            if (!psmouse->name) psmouse->name = "Explorer Mouse";
            psmouse->pktsize = 4;
      }

      return 0;
}

/*
 * Kensington ThinkingMouse / ExpertMouse magic init.
 */
static int thinking_detect(struct psmouse *psmouse, int set_properties)
{
      struct ps2dev *ps2dev = &psmouse->ps2dev;
      unsigned char param[2];
      static const unsigned char seq[] = { 20, 60, 40, 20, 20, 60, 40, 20, 20 };
      int i;

      param[0] = 10;
      ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
      param[0] = 0;
      ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
      for (i = 0; i < ARRAY_SIZE(seq); i++) {
            param[0] = seq[i];
            ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE);
      }
      ps2_command(ps2dev, param, PSMOUSE_CMD_GETID);

      if (param[0] != 2)
            return -1;

      if (set_properties) {
            set_bit(BTN_EXTRA, psmouse->dev->keybit);

            psmouse->vendor = "Kensington";
            psmouse->name = "ThinkingMouse";
      }

      return 0;
}

/*
 * Bare PS/2 protocol "detection". Always succeeds.
 */
static int ps2bare_detect(struct psmouse *psmouse, int set_properties)
{
      if (set_properties) {
            if (!psmouse->vendor) psmouse->vendor = "Generic";
            if (!psmouse->name) psmouse->name = "Mouse";
      }

      return 0;
}

/*
 * Cortron PS/2 protocol detection. There's no special way to detect it, so it
 * must be forced by sysfs protocol writing.
 */
static int cortron_detect(struct psmouse *psmouse, int set_properties)
{
      if (set_properties) {
            psmouse->vendor = "Cortron";
            psmouse->name = "PS/2 Trackball";
            set_bit(BTN_SIDE, psmouse->dev->keybit);
      }

      return 0;
}

/*
 * psmouse_extensions() probes for any extensions to the basic PS/2 protocol
 * the mouse may have.
 */

static int psmouse_extensions(struct psmouse *psmouse,
                        unsigned int max_proto, int set_properties)
{
      int synaptics_hardware = 0;

/*
 * We always check for lifebook because it does not disturb mouse
 * (it only checks DMI information).
 */
      if (lifebook_detect(psmouse, set_properties) == 0) {
            if (max_proto > PSMOUSE_IMEX) {
                  if (!set_properties || lifebook_init(psmouse) == 0)
                        return PSMOUSE_LIFEBOOK;
            }
      }

/*
 * Try Kensington ThinkingMouse (we try first, because synaptics probe
 * upsets the thinkingmouse).
 */

      if (max_proto > PSMOUSE_IMEX && thinking_detect(psmouse, set_properties) == 0)
            return PSMOUSE_THINKPS;

/*
 * Try Synaptics TouchPad. Note that probing is done even if Synaptics protocol
 * support is disabled in config - we need to know if it is synaptics so we
 * can reset it properly after probing for intellimouse.
 */
      if (max_proto > PSMOUSE_PS2 && synaptics_detect(psmouse, set_properties) == 0) {
            synaptics_hardware = 1;

            if (max_proto > PSMOUSE_IMEX) {
                  if (!set_properties || synaptics_init(psmouse) == 0)
                        return PSMOUSE_SYNAPTICS;
/*
 * Some Synaptics touchpads can emulate extended protocols (like IMPS/2).
 * Unfortunately Logitech/Genius probes confuse some firmware versions so
 * we'll have to skip them.
 */
                  max_proto = PSMOUSE_IMEX;
            }
/*
 * Make sure that touchpad is in relative mode, gestures (taps) are enabled
 */
            synaptics_reset(psmouse);
      }

/*
 * Try ALPS TouchPad
 */
      if (max_proto > PSMOUSE_IMEX) {
            ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
            if (alps_detect(psmouse, set_properties) == 0) {
                  if (!set_properties || alps_init(psmouse) == 0)
                        return PSMOUSE_ALPS;
/*
 * Init failed, try basic relative protocols
 */
                  max_proto = PSMOUSE_IMEX;
            }
      }

      if (max_proto > PSMOUSE_IMEX) {

            if (genius_detect(psmouse, set_properties) == 0)
                  return PSMOUSE_GENPS;

            if (ps2pp_init(psmouse, set_properties) == 0)
                  return PSMOUSE_PS2PP;

            if (trackpoint_detect(psmouse, set_properties) == 0)
                  return PSMOUSE_TRACKPOINT;

            if (touchkit_ps2_detect(psmouse, set_properties) == 0)
                  return PSMOUSE_TOUCHKIT_PS2;
      }

/*
 * Reset to defaults in case the device got confused by extended
 * protocol probes. Note that we follow up with full reset because
 * some mice put themselves to sleep when they see PSMOUSE_RESET_DIS.
 */
      ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
      psmouse_reset(psmouse);

      if (max_proto >= PSMOUSE_IMEX && im_explorer_detect(psmouse, set_properties) == 0)
            return PSMOUSE_IMEX;

      if (max_proto >= PSMOUSE_IMPS && intellimouse_detect(psmouse, set_properties) == 0)
            return PSMOUSE_IMPS;

/*
 * Okay, all failed, we have a standard mouse here. The number of the buttons
 * is still a question, though. We assume 3.
 */
      ps2bare_detect(psmouse, set_properties);

      if (synaptics_hardware) {
/*
 * We detected Synaptics hardware but it did not respond to IMPS/2 probes.
 * We need to reset the touchpad because if there is a track point on the
 * pass through port it could get disabled while probing for protocol
 * extensions.
 */
            psmouse_reset(psmouse);
      }

      return PSMOUSE_PS2;
}

static const struct psmouse_protocol psmouse_protocols[] = {
      {
            .type       = PSMOUSE_PS2,
            .name       = "PS/2",
            .alias            = "bare",
            .maxproto   = 1,
            .detect           = ps2bare_detect,
      },
#ifdef CONFIG_MOUSE_PS2_LOGIPS2PP
      {
            .type       = PSMOUSE_PS2PP,
            .name       = "PS2++",
            .alias            = "logitech",
            .detect           = ps2pp_init,
      },
#endif
      {
            .type       = PSMOUSE_THINKPS,
            .name       = "ThinkPS/2",
            .alias            = "thinkps",
            .detect           = thinking_detect,
      },
      {
            .type       = PSMOUSE_GENPS,
            .name       = "GenPS/2",
            .alias            = "genius",
            .detect           = genius_detect,
      },
      {
            .type       = PSMOUSE_IMPS,
            .name       = "ImPS/2",
            .alias            = "imps",
            .maxproto   = 1,
            .detect           = intellimouse_detect,
      },
      {
            .type       = PSMOUSE_IMEX,
            .name       = "ImExPS/2",
            .alias            = "exps",
            .maxproto   = 1,
            .detect           = im_explorer_detect,
      },
#ifdef CONFIG_MOUSE_PS2_SYNAPTICS
      {
            .type       = PSMOUSE_SYNAPTICS,
            .name       = "SynPS/2",
            .alias            = "synaptics",
            .detect           = synaptics_detect,
            .init       = synaptics_init,
      },
#endif
#ifdef CONFIG_MOUSE_PS2_ALPS
      {
            .type       = PSMOUSE_ALPS,
            .name       = "AlpsPS/2",
            .alias            = "alps",
            .detect           = alps_detect,
            .init       = alps_init,
      },
#endif
#ifdef CONFIG_MOUSE_PS2_LIFEBOOK
      {
            .type       = PSMOUSE_LIFEBOOK,
            .name       = "LBPS/2",
            .alias            = "lifebook",
            .init       = lifebook_init,
      },
#endif
#ifdef CONFIG_MOUSE_PS2_TRACKPOINT
      {
            .type       = PSMOUSE_TRACKPOINT,
            .name       = "TPPS/2",
            .alias            = "trackpoint",
            .detect           = trackpoint_detect,
      },
#endif
#ifdef CONFIG_MOUSE_PS2_TOUCHKIT
      {
            .type       = PSMOUSE_TOUCHKIT_PS2,
            .name       = "touchkitPS/2",
            .alias            = "touchkit",
            .detect           = touchkit_ps2_detect,
      },
#endif
      {
            .type       = PSMOUSE_CORTRON,
            .name       = "CortronPS/2",
            .alias            = "cortps",
            .detect           = cortron_detect,
      },
      {
            .type       = PSMOUSE_AUTO,
            .name       = "auto",
            .alias            = "any",
            .maxproto   = 1,
      },
};

static const struct psmouse_protocol *psmouse_protocol_by_type(enum psmouse_type type)
{
      int i;

      for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++)
            if (psmouse_protocols[i].type == type)
                  return &psmouse_protocols[i];

      WARN_ON(1);
      return &psmouse_protocols[0];
}

static const struct psmouse_protocol *psmouse_protocol_by_name(const char *name, size_t len)
{
      const struct psmouse_protocol *p;
      int i;

      for (i = 0; i < ARRAY_SIZE(psmouse_protocols); i++) {
            p = &psmouse_protocols[i];

            if ((strlen(p->name) == len && !strncmp(p->name, name, len)) ||
                (strlen(p->alias) == len && !strncmp(p->alias, name, len)))
                  return &psmouse_protocols[i];
      }

      return NULL;
}


/*
 * psmouse_probe() probes for a PS/2 mouse.
 */

static int psmouse_probe(struct psmouse *psmouse)
{
      struct ps2dev *ps2dev = &psmouse->ps2dev;
      unsigned char param[2];

/*
 * First, we check if it's a mouse. It should send 0x00 or 0x03
 * in case of an IntelliMouse in 4-byte mode or 0x04 for IM Explorer.
 * Sunrex K8561 IR Keyboard/Mouse reports 0xff on second and subsequent
 * ID queries, probably due to a firmware bug.
 */

      param[0] = 0xa5;
      if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETID))
            return -1;

      if (param[0] != 0x00 && param[0] != 0x03 &&
          param[0] != 0x04 && param[0] != 0xff)
            return -1;

/*
 * Then we reset and disable the mouse so that it doesn't generate events.
 */

      if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS))
            printk(KERN_WARNING "psmouse.c: Failed to reset mouse on %s\n", ps2dev->serio->phys);

      return 0;
}

/*
 * Here we set the mouse resolution.
 */

void psmouse_set_resolution(struct psmouse *psmouse, unsigned int resolution)
{
      static const unsigned char params[] = { 0, 1, 2, 2, 3 };
      unsigned char p;

      if (resolution == 0 || resolution > 200)
            resolution = 200;

      p = params[resolution / 50];
      ps2_command(&psmouse->ps2dev, &p, PSMOUSE_CMD_SETRES);
      psmouse->resolution = 25 << p;
}

/*
 * Here we set the mouse report rate.
 */

static void psmouse_set_rate(struct psmouse *psmouse, unsigned int rate)
{
      static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10, 0 };
      unsigned char r;
      int i = 0;

      while (rates[i] > rate) i++;
      r = rates[i];
      ps2_command(&psmouse->ps2dev, &r, PSMOUSE_CMD_SETRATE);
      psmouse->rate = r;
}

/*
 * psmouse_initialize() initializes the mouse to a sane state.
 */

static void psmouse_initialize(struct psmouse *psmouse)
{
/*
 * We set the mouse report rate, resolution and scaling.
 */

      if (psmouse_max_proto != PSMOUSE_PS2) {
            psmouse->set_rate(psmouse, psmouse->rate);
            psmouse->set_resolution(psmouse, psmouse->resolution);
            ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11);
      }
}

/*
 * psmouse_activate() enables the mouse so that we get motion reports from it.
 */

static void psmouse_activate(struct psmouse *psmouse)
{
      if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE))
            printk(KERN_WARNING "psmouse.c: Failed to enable mouse on %s\n",
                  psmouse->ps2dev.serio->phys);

      psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
}


/*
 * psmouse_deactivate() puts the mouse into poll mode so that we don't get motion
 * reports from it unless we explicitly request it.
 */

static void psmouse_deactivate(struct psmouse *psmouse)
{
      if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_DISABLE))
            printk(KERN_WARNING "psmouse.c: Failed to deactivate mouse on %s\n",
                  psmouse->ps2dev.serio->phys);

      psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
}

/*
 * psmouse_poll() - default poll hanlder. Everyone except for ALPS uses it.
 */

static int psmouse_poll(struct psmouse *psmouse)
{
      return ps2_command(&psmouse->ps2dev, psmouse->packet,
                     PSMOUSE_CMD_POLL | (psmouse->pktsize << 8));
}


/*
 * psmouse_resync() attempts to re-validate current protocol.
 */

static void psmouse_resync(struct work_struct *work)
{
      struct psmouse *parent = NULL, *psmouse =
            container_of(work, struct psmouse, resync_work);
      struct serio *serio = psmouse->ps2dev.serio;
      psmouse_ret_t rc = PSMOUSE_GOOD_DATA;
      int failed = 0, enabled = 0;
      int i;

      mutex_lock(&psmouse_mutex);

      if (psmouse->state != PSMOUSE_RESYNCING)
            goto out;

      if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
            parent = serio_get_drvdata(serio->parent);
            psmouse_deactivate(parent);
      }

/*
 * Some mice don't ACK commands sent while they are in the middle of
 * transmitting motion packet. To avoid delay we use ps2_sendbyte()
 * instead of ps2_command() which would wait for 200ms for an ACK
 * that may never come.
 * As an additional quirk ALPS touchpads may not only forget to ACK
 * disable command but will stop reporting taps, so if we see that
 * mouse at least once ACKs disable we will do full reconnect if ACK
 * is missing.
 */
      psmouse->num_resyncs++;

      if (ps2_sendbyte(&psmouse->ps2dev, PSMOUSE_CMD_DISABLE, 20)) {
            if (psmouse->num_resyncs < 3 || psmouse->acks_disable_command)
                  failed = 1;
      } else
            psmouse->acks_disable_command = 1;

/*
 * Poll the mouse. If it was reset the packet will be shorter than
 * psmouse->pktsize and ps2_command will fail. We do not expect and
 * do not handle scenario when mouse "upgrades" its protocol while
 * disconnected since it would require additional delay. If we ever
 * see a mouse that does it we'll adjust the code.
 */
      if (!failed) {
            if (psmouse->poll(psmouse))
                  failed = 1;
            else {
                  psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
                  for (i = 0; i < psmouse->pktsize; i++) {
                        psmouse->pktcnt++;
                        rc = psmouse->protocol_handler(psmouse);
                        if (rc != PSMOUSE_GOOD_DATA)
                              break;
                  }
                  if (rc != PSMOUSE_FULL_PACKET)
                        failed = 1;
                  psmouse_set_state(psmouse, PSMOUSE_RESYNCING);
            }
      }
/*
 * Now try to enable mouse. We try to do that even if poll failed and also
 * repeat our attempts 5 times, otherwise we may be left out with disabled
 * mouse.
 */
      for (i = 0; i < 5; i++) {
            if (!ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
                  enabled = 1;
                  break;
            }
            msleep(200);
      }

      if (!enabled) {
            printk(KERN_WARNING "psmouse.c: failed to re-enable mouse on %s\n",
                  psmouse->ps2dev.serio->phys);
            failed = 1;
      }

      if (failed) {
            psmouse_set_state(psmouse, PSMOUSE_IGNORE);
            printk(KERN_INFO "psmouse.c: resync failed, issuing reconnect request\n");
            serio_reconnect(serio);
      } else
            psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);

      if (parent)
            psmouse_activate(parent);
 out:
      mutex_unlock(&psmouse_mutex);
}

/*
 * psmouse_cleanup() resets the mouse into power-on state.
 */

static void psmouse_cleanup(struct serio *serio)
{
      struct psmouse *psmouse = serio_get_drvdata(serio);
      struct psmouse *parent = NULL;

      mutex_lock(&psmouse_mutex);

      if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
            parent = serio_get_drvdata(serio->parent);
            psmouse_deactivate(parent);
      }

      psmouse_deactivate(psmouse);

      if (psmouse->cleanup)
            psmouse->cleanup(psmouse);

      psmouse_reset(psmouse);

/*
 * Some boxes, such as HP nx7400, get terribly confused if mouse
 * is not fully enabled before suspending/shutting down.
 */
      ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_ENABLE);

      if (parent) {
            if (parent->pt_deactivate)
                  parent->pt_deactivate(parent);

            psmouse_activate(parent);
      }

      mutex_unlock(&psmouse_mutex);
}

/*
 * psmouse_disconnect() closes and frees.
 */

static void psmouse_disconnect(struct serio *serio)
{
      struct psmouse *psmouse, *parent = NULL;

      psmouse = serio_get_drvdata(serio);

      sysfs_remove_group(&serio->dev.kobj, &psmouse_attribute_group);

      mutex_lock(&psmouse_mutex);

      psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);

      /* make sure we don't have a resync in progress */
      mutex_unlock(&psmouse_mutex);
      flush_workqueue(kpsmoused_wq);
      mutex_lock(&psmouse_mutex);

      if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
            parent = serio_get_drvdata(serio->parent);
            psmouse_deactivate(parent);
      }

      if (psmouse->disconnect)
            psmouse->disconnect(psmouse);

      if (parent && parent->pt_deactivate)
            parent->pt_deactivate(parent);

      psmouse_set_state(psmouse, PSMOUSE_IGNORE);

      serio_close(serio);
      serio_set_drvdata(serio, NULL);
      input_unregister_device(psmouse->dev);
      kfree(psmouse);

      if (parent)
            psmouse_activate(parent);

      mutex_unlock(&psmouse_mutex);
}

static int psmouse_switch_protocol(struct psmouse *psmouse, const struct psmouse_protocol *proto)
{
      struct input_dev *input_dev = psmouse->dev;

      input_dev->dev.parent = &psmouse->ps2dev.serio->dev;

      input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
      input_dev->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
            BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
      input_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);

      psmouse->set_rate = psmouse_set_rate;
      psmouse->set_resolution = psmouse_set_resolution;
      psmouse->poll = psmouse_poll;
      psmouse->protocol_handler = psmouse_process_byte;
      psmouse->pktsize = 3;

      if (proto && (proto->detect || proto->init)) {
            if (proto->detect && proto->detect(psmouse, 1) < 0)
                  return -1;

            if (proto->init && proto->init(psmouse) < 0)
                  return -1;

            psmouse->type = proto->type;
      }
      else
            psmouse->type = psmouse_extensions(psmouse, psmouse_max_proto, 1);

      /*
       * If mouse's packet size is 3 there is no point in polling the
       * device in hopes to detect protocol reset - we won't get less
       * than 3 bytes response anyhow.
       */
      if (psmouse->pktsize == 3)
            psmouse->resync_time = 0;

      /*
       * Some smart KVMs fake response to POLL command returning just
       * 3 bytes and messing up our resync logic, so if initial poll
       * fails we won't try polling the device anymore. Hopefully
       * such KVM will maintain initially selected protocol.
       */
      if (psmouse->resync_time && psmouse->poll(psmouse))
            psmouse->resync_time = 0;

      snprintf(psmouse->devname, sizeof(psmouse->devname), "%s %s %s",
             psmouse_protocol_by_type(psmouse->type)->name, psmouse->vendor, psmouse->name);

      input_dev->name = psmouse->devname;
      input_dev->phys = psmouse->phys;
      input_dev->id.bustype = BUS_I8042;
      input_dev->id.vendor = 0x0002;
      input_dev->id.product = psmouse->type;
      input_dev->id.version = psmouse->model;

      return 0;
}

/*
 * psmouse_connect() is a callback from the serio module when
 * an unhandled serio port is found.
 */
static int psmouse_connect(struct serio *serio, struct serio_driver *drv)
{
      struct psmouse *psmouse, *parent = NULL;
      struct input_dev *input_dev;
      int retval = 0, error = -ENOMEM;

      mutex_lock(&psmouse_mutex);

      /*
       * If this is a pass-through port deactivate parent so the device
       * connected to this port can be successfully identified
       */
      if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
            parent = serio_get_drvdata(serio->parent);
            psmouse_deactivate(parent);
      }

      psmouse = kzalloc(sizeof(struct psmouse), GFP_KERNEL);
      input_dev = input_allocate_device();
      if (!psmouse || !input_dev)
            goto err_free;

      ps2_init(&psmouse->ps2dev, serio);
      INIT_WORK(&psmouse->resync_work, psmouse_resync);
      psmouse->dev = input_dev;
      snprintf(psmouse->phys, sizeof(psmouse->phys), "%s/input0", serio->phys);

      psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);

      serio_set_drvdata(serio, psmouse);

      error = serio_open(serio, drv);
      if (error)
            goto err_clear_drvdata;

      if (psmouse_probe(psmouse) < 0) {
            error = -ENODEV;
            goto err_close_serio;
      }

      psmouse->rate = psmouse_rate;
      psmouse->resolution = psmouse_resolution;
      psmouse->resetafter = psmouse_resetafter;
      psmouse->resync_time = parent ? 0 : psmouse_resync_time;
      psmouse->smartscroll = psmouse_smartscroll;

      psmouse_switch_protocol(psmouse, NULL);

      psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);
      psmouse_initialize(psmouse);

      error = input_register_device(psmouse->dev);
      if (error)
            goto err_protocol_disconnect;

      if (parent && parent->pt_activate)
            parent->pt_activate(parent);

      error = sysfs_create_group(&serio->dev.kobj, &psmouse_attribute_group);
      if (error)
            goto err_pt_deactivate;

      psmouse_activate(psmouse);

 out:
      /* If this is a pass-through port the parent needs to be re-activated */
      if (parent)
            psmouse_activate(parent);

      mutex_unlock(&psmouse_mutex);
      return retval;

 err_pt_deactivate:
      if (parent && parent->pt_deactivate)
            parent->pt_deactivate(parent);
      input_unregister_device(psmouse->dev);
      input_dev = NULL; /* so we don't try to free it below */
 err_protocol_disconnect:
      if (psmouse->disconnect)
            psmouse->disconnect(psmouse);
      psmouse_set_state(psmouse, PSMOUSE_IGNORE);
 err_close_serio:
      serio_close(serio);
 err_clear_drvdata:
      serio_set_drvdata(serio, NULL);
 err_free:
      input_free_device(input_dev);
      kfree(psmouse);

      retval = error;
      goto out;
}


static int psmouse_reconnect(struct serio *serio)
{
      struct psmouse *psmouse = serio_get_drvdata(serio);
      struct psmouse *parent = NULL;
      struct serio_driver *drv = serio->drv;
      int rc = -1;

      if (!drv || !psmouse) {
            printk(KERN_DEBUG "psmouse: reconnect request, but serio is disconnected, ignoring...\n");
            return -1;
      }

      mutex_lock(&psmouse_mutex);

      if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
            parent = serio_get_drvdata(serio->parent);
            psmouse_deactivate(parent);
      }

      psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);

      if (psmouse->reconnect) {
            if (psmouse->reconnect(psmouse))
                  goto out;
      } else if (psmouse_probe(psmouse) < 0 ||
               psmouse->type != psmouse_extensions(psmouse, psmouse_max_proto, 0))
            goto out;

      /* ok, the device type (and capabilities) match the old one,
       * we can continue using it, complete intialization
       */
      psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);

      psmouse_initialize(psmouse);

      if (parent && parent->pt_activate)
            parent->pt_activate(parent);

      psmouse_activate(psmouse);
      rc = 0;

out:
      /* If this is a pass-through port the parent waits to be activated */
      if (parent)
            psmouse_activate(parent);

      mutex_unlock(&psmouse_mutex);
      return rc;
}

static struct serio_device_id psmouse_serio_ids[] = {
      {
            .type = SERIO_8042,
            .proto      = SERIO_ANY,
            .id   = SERIO_ANY,
            .extra      = SERIO_ANY,
      },
      {
            .type = SERIO_PS_PSTHRU,
            .proto      = SERIO_ANY,
            .id   = SERIO_ANY,
            .extra      = SERIO_ANY,
      },
      { 0 }
};

MODULE_DEVICE_TABLE(serio, psmouse_serio_ids);

static struct serio_driver psmouse_drv = {
      .driver           = {
            .name = "psmouse",
      },
      .description      = DRIVER_DESC,
      .id_table   = psmouse_serio_ids,
      .interrupt  = psmouse_interrupt,
      .connect    = psmouse_connect,
      .reconnect  = psmouse_reconnect,
      .disconnect = psmouse_disconnect,
      .cleanup    = psmouse_cleanup,
};

ssize_t psmouse_attr_show_helper(struct device *dev, struct device_attribute *devattr,
                         char *buf)
{
      struct serio *serio = to_serio_port(dev);
      struct psmouse_attribute *attr = to_psmouse_attr(devattr);
      struct psmouse *psmouse;
      int retval;

      retval = serio_pin_driver(serio);
      if (retval)
            return retval;

      if (serio->drv != &psmouse_drv) {
            retval = -ENODEV;
            goto out;
      }

      psmouse = serio_get_drvdata(serio);

      retval = attr->show(psmouse, attr->data, buf);

out:
      serio_unpin_driver(serio);
      return retval;
}

ssize_t psmouse_attr_set_helper(struct device *dev, struct device_attribute *devattr,
                        const char *buf, size_t count)
{
      struct serio *serio = to_serio_port(dev);
      struct psmouse_attribute *attr = to_psmouse_attr(devattr);
      struct psmouse *psmouse, *parent = NULL;
      int retval;

      retval = serio_pin_driver(serio);
      if (retval)
            return retval;

      if (serio->drv != &psmouse_drv) {
            retval = -ENODEV;
            goto out_unpin;
      }

      retval = mutex_lock_interruptible(&psmouse_mutex);
      if (retval)
            goto out_unpin;

      psmouse = serio_get_drvdata(serio);

      if (psmouse->state == PSMOUSE_IGNORE) {
            retval = -ENODEV;
            goto out_unlock;
      }

      if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
            parent = serio_get_drvdata(serio->parent);
            psmouse_deactivate(parent);
      }

      psmouse_deactivate(psmouse);

      retval = attr->set(psmouse, attr->data, buf, count);

      if (retval != -ENODEV)
            psmouse_activate(psmouse);

      if (parent)
            psmouse_activate(parent);

 out_unlock:
      mutex_unlock(&psmouse_mutex);
 out_unpin:
      serio_unpin_driver(serio);
      return retval;
}

static ssize_t psmouse_show_int_attr(struct psmouse *psmouse, void *offset, char *buf)
{
      unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);

      return sprintf(buf, "%u\n", *field);
}

static ssize_t psmouse_set_int_attr(struct psmouse *psmouse, void *offset, const char *buf, size_t count)
{
      unsigned int *field = (unsigned int *)((char *)psmouse + (size_t)offset);
      unsigned long value;
      char *rest;

      value = simple_strtoul(buf, &rest, 10);
      if (*rest)
            return -EINVAL;

      if ((unsigned int)value != value)
            return -EINVAL;

      *field = value;

      return count;
}

static ssize_t psmouse_attr_show_protocol(struct psmouse *psmouse, void *data, char *buf)
{
      return sprintf(buf, "%s\n", psmouse_protocol_by_type(psmouse->type)->name);
}

static ssize_t psmouse_attr_set_protocol(struct psmouse *psmouse, void *data, const char *buf, size_t count)
{
      struct serio *serio = psmouse->ps2dev.serio;
      struct psmouse *parent = NULL;
      struct input_dev *old_dev, *new_dev;
      const struct psmouse_protocol *proto, *old_proto;
      int error;
      int retry = 0;

      proto = psmouse_protocol_by_name(buf, count);
      if (!proto)
            return -EINVAL;

      if (psmouse->type == proto->type)
            return count;

      new_dev = input_allocate_device();
      if (!new_dev)
            return -ENOMEM;

      while (serio->child) {
            if (++retry > 3) {
                  printk(KERN_WARNING "psmouse: failed to destroy child port, protocol change aborted.\n");
                  input_free_device(new_dev);
                  return -EIO;
            }

            mutex_unlock(&psmouse_mutex);
            serio_unpin_driver(serio);
            serio_unregister_child_port(serio);
            serio_pin_driver_uninterruptible(serio);
            mutex_lock(&psmouse_mutex);

            if (serio->drv != &psmouse_drv) {
                  input_free_device(new_dev);
                  return -ENODEV;
            }

            if (psmouse->type == proto->type) {
                  input_free_device(new_dev);
                  return count; /* switched by other thread */
            }
      }

      if (serio->parent && serio->id.type == SERIO_PS_PSTHRU) {
            parent = serio_get_drvdata(serio->parent);
            if (parent->pt_deactivate)
                  parent->pt_deactivate(parent);
      }

      old_dev = psmouse->dev;
      old_proto = psmouse_protocol_by_type(psmouse->type);

      if (psmouse->disconnect)
            psmouse->disconnect(psmouse);

      psmouse_set_state(psmouse, PSMOUSE_IGNORE);

      psmouse->dev = new_dev;
      psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);

      if (psmouse_switch_protocol(psmouse, proto) < 0) {
            psmouse_reset(psmouse);
            /* default to PSMOUSE_PS2 */
            psmouse_switch_protocol(psmouse, &psmouse_protocols[0]);
      }

      psmouse_initialize(psmouse);
      psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);

      error = input_register_device(psmouse->dev);
      if (error) {
            if (psmouse->disconnect)
                  psmouse->disconnect(psmouse);

            psmouse_set_state(psmouse, PSMOUSE_IGNORE);
            input_free_device(new_dev);
            psmouse->dev = old_dev;
            psmouse_set_state(psmouse, PSMOUSE_INITIALIZING);
            psmouse_switch_protocol(psmouse, old_proto);
            psmouse_initialize(psmouse);
            psmouse_set_state(psmouse, PSMOUSE_CMD_MODE);

            return error;
      }

      input_unregister_device(old_dev);

      if (parent && parent->pt_activate)
            parent->pt_activate(parent);

      return count;
}

static ssize_t psmouse_attr_set_rate(struct psmouse *psmouse, void *data, const char *buf, size_t count)
{
      unsigned long value;
      char *rest;

      value = simple_strtoul(buf, &rest, 10);
      if (*rest)
            return -EINVAL;

      psmouse->set_rate(psmouse, value);
      return count;
}

static ssize_t psmouse_attr_set_resolution(struct psmouse *psmouse, void *data, const char *buf, size_t count)
{
      unsigned long value;
      char *rest;

      value = simple_strtoul(buf, &rest, 10);
      if (*rest)
            return -EINVAL;

      psmouse->set_resolution(psmouse, value);
      return count;
}


static int psmouse_set_maxproto(const char *val, struct kernel_param *kp)
{
      const struct psmouse_protocol *proto;

      if (!val)
            return -EINVAL;

      proto = psmouse_protocol_by_name(val, strlen(val));

      if (!proto || !proto->maxproto)
            return -EINVAL;

      *((unsigned int *)kp->arg) = proto->type;

      return 0;
}

static int psmouse_get_maxproto(char *buffer, struct kernel_param *kp)
{
      int type = *((unsigned int *)kp->arg);

      return sprintf(buffer, "%s\n", psmouse_protocol_by_type(type)->name);
}

static int __init psmouse_init(void)
{
      int err;

      kpsmoused_wq = create_singlethread_workqueue("kpsmoused");
      if (!kpsmoused_wq) {
            printk(KERN_ERR "psmouse: failed to create kpsmoused workqueue\n");
            return -ENOMEM;
      }

      err = serio_register_driver(&psmouse_drv);
      if (err)
            destroy_workqueue(kpsmoused_wq);

      return err;
}

static void __exit psmouse_exit(void)
{
      serio_unregister_driver(&psmouse_drv);
      destroy_workqueue(kpsmoused_wq);
}

module_init(psmouse_init);
module_exit(psmouse_exit);

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