text: /*
   * Synaptics TouchPad PS/2 mouse driver
   *
   *   2003 Dmitry Torokhov <dtor@mail.ru>
   *     Added support for pass-through port. Special thanks to Peter Berg Larsen
   *     for explaining various Synaptics quirks.
   *
   *   2003 Peter Osterlund <petero2@telia.com>
   *     Ported to 2.5 input device infrastructure.
   *
   *   Copyright (C) 2001 Stefan Gmeiner <riddlebox@freesurf.ch>
   *     start merging tpconfig and gpm code to a xfree-input module
   *     adding some changes and extensions (ex. 3rd and 4th button)
   *
   *   Copyright (c) 1997 C. Scott Ananian <cananian@alumni.priceton.edu>
   *   Copyright (c) 1998-2000 Bruce Kalk <kall@compass.com>
   *     code for the special synaptics commands (from the tpconfig-source)
   *
   * 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.
   *
   * Trademarks are the property of their respective owners.
   */
  
  #include <linux/module.h>
  #include <linux/delay.h>
  #include <linux/dmi.h>
  #include <linux/input/mt.h>
  #include <linux/serio.h>
  #include <linux/libps2.h>
  #include <linux/slab.h>
  #include "psmouse.h"
  #include "synaptics.h"
  
  /*
   * The x/y limits are taken from the Synaptics TouchPad interfacing Guide,
   * section 2.3.2, which says that they should be valid regardless of the
   * actual size of the sensor.
   * Note that newer firmware allows querying device for maximum useable
   * coordinates.
   */
  #define XMIN 0
  #define XMAX 6143
  #define YMIN 0
  #define YMAX 6143
  #define XMIN_NOMINAL 1472
  #define XMAX_NOMINAL 5472
  #define YMIN_NOMINAL 1408
  #define YMAX_NOMINAL 4448
  
  /* Size in bits of absolute position values reported by the hardware */
  #define ABS_POS_BITS 13
  
  /*
   * These values should represent the absolute maximum value that will
   * be reported for a positive position value. Some Synaptics firmware
   * uses this value to indicate a finger near the edge of the touchpad
   * whose precise position cannot be determined.
   *
   * At least one touchpad is known to report positions in excess of this
   * value which are actually negative values truncated to the 13-bit
   * reporting range. These values have never been observed to be lower
   * than 8184 (i.e. -8), so we treat all values greater than 8176 as
   * negative and any other value as positive.
   */
  #define X_MAX_POSITIVE 8176
  #define Y_MAX_POSITIVE 8176
  
  /*****************************************************************************
   *	Stuff we need even when we do not want native Synaptics support
   ****************************************************************************/
  
  /*
   * Set the synaptics touchpad mode byte by special commands
   */
  static int synaptics_mode_cmd(struct psmouse *psmouse, unsigned char mode)
  {
  	unsigned char param[1];
  
  	if (psmouse_sliced_command(psmouse, mode))
  		return -1;
  	param[0] = SYN_PS_SET_MODE2;
  	if (ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_SETRATE))
  		return -1;
  	return 0;
  }
  
  int synaptics_detect(struct psmouse *psmouse, bool set_properties)
  {
  	struct ps2dev *ps2dev = &psmouse->ps2dev;
  	unsigned char param[4];
  
  	param[0] = 0;
  
  	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
  	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
  	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
  	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
  	ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);
  
  	if (param[1] != 0x47)
  		return -ENODEV;
  
  	if (set_properties) {
  		psmouse->vendor = "Synaptics";
  		psmouse->name = "TouchPad";
  	}
  
  	return 0;
  }
  
  void synaptics_reset(struct psmouse *psmouse)
  {
  	/* reset touchpad back to relative mode, gestures enabled */
  	synaptics_mode_cmd(psmouse, 0);
  }
  
  #ifdef CONFIG_MOUSE_PS2_SYNAPTICS
  
  /*****************************************************************************
   *	Synaptics communications functions
   ****************************************************************************/
  
  /*
   * Synaptics touchpads report the y coordinate from bottom to top, which is
   * opposite from what userspace expects.
   * This function is used to invert y before reporting.
   */
  static int synaptics_invert_y(int y)
  {
  	return YMAX_NOMINAL + YMIN_NOMINAL - y;
  }
  
  /*
   * Send a command to the synpatics touchpad by special commands
   */
  static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c, unsigned char *param)
  {
  	if (psmouse_sliced_command(psmouse, c))
  		return -1;
  	if (ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO))
  		return -1;
  	return 0;
  }
  
  /*
   * Read the model-id bytes from the touchpad
   * see also SYN_MODEL_* macros
   */
  static int synaptics_model_id(struct psmouse *psmouse)
  {
  	struct synaptics_data *priv = psmouse->private;
  	unsigned char mi[3];
  
  	if (synaptics_send_cmd(psmouse, SYN_QUE_MODEL, mi))
  		return -1;
  	priv->model_id = (mi[0]<<16) | (mi[1]<<8) | mi[2];
  	return 0;
  }
  
  /*
   * Read the board id from the touchpad
   * The board id is encoded in the "QUERY MODES" response
   */
  static int synaptics_board_id(struct psmouse *psmouse)
  {
  	struct synaptics_data *priv = psmouse->private;
  	unsigned char bid[3];
  
  	if (synaptics_send_cmd(psmouse, SYN_QUE_MODES, bid))
  		return -1;
  	priv->board_id = ((bid[0] & 0xfc) << 6) | bid[1];
  	return 0;
  }
  
  /*
   * Read the firmware id from the touchpad
   */
  static int synaptics_firmware_id(struct psmouse *psmouse)
  {
  	struct synaptics_data *priv = psmouse->private;
  	unsigned char fwid[3];
  
  	if (synaptics_send_cmd(psmouse, SYN_QUE_FIRMWARE_ID, fwid))
  		return -1;
  	priv->firmware_id = (fwid[0] << 16) | (fwid[1] << 8) | fwid[2];
  	return 0;
  }
  
  /*
   * Read the capability-bits from the touchpad
   * see also the SYN_CAP_* macros
   */
  static int synaptics_capability(struct psmouse *psmouse)
  {
  	struct synaptics_data *priv = psmouse->private;
  	unsigned char cap[3];
  
  	if (synaptics_send_cmd(psmouse, SYN_QUE_CAPABILITIES, cap))
  		return -1;
  	priv->capabilities = (cap[0] << 16) | (cap[1] << 8) | cap[2];
  	priv->ext_cap = priv->ext_cap_0c = 0;
  
  	/*
  	 * Older firmwares had submodel ID fixed to 0x47
  	 */
  	if (SYN_ID_FULL(priv->identity) < 0x705 &&
  	    SYN_CAP_SUBMODEL_ID(priv->capabilities) != 0x47) {
  		return -1;
  	}
  
  	/*
  	 * Unless capExtended is set the rest of the flags should be ignored
  	 */
  	if (!SYN_CAP_EXTENDED(priv->capabilities))
  		priv->capabilities = 0;
  
  	if (SYN_EXT_CAP_REQUESTS(priv->capabilities) >= 1) {
  		if (synaptics_send_cmd(psmouse, SYN_QUE_EXT_CAPAB, cap)) {
  			psmouse_warn(psmouse,
  				     "device claims to have extended capabilities, but I'm not able to read them.\n");
  		} else {
  			priv->ext_cap = (cap[0] << 16) | (cap[1] << 8) | cap[2];
  
  			/*
  			 * if nExtBtn is greater than 8 it should be considered
  			 * invalid and treated as 0
  			 */
  			if (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) > 8)
  				priv->ext_cap &= 0xff0fff;
  		}
  	}
  
  	if (SYN_EXT_CAP_REQUESTS(priv->capabilities) >= 4) {
  		if (synaptics_send_cmd(psmouse, SYN_QUE_EXT_CAPAB_0C, cap)) {
  			psmouse_warn(psmouse,
  				     "device claims to have extended capability 0x0c, but I'm not able to read it.\n");
  		} else {
  			priv->ext_cap_0c = (cap[0] << 16) | (cap[1] << 8) | cap[2];
  		}
  	}
  
  	return 0;
  }
  
  /*
   * Identify Touchpad
   * See also the SYN_ID_* macros
   */
  static int synaptics_identify(struct psmouse *psmouse)
  {
  	struct synaptics_data *priv = psmouse->private;
  	unsigned char id[3];
  
  	if (synaptics_send_cmd(psmouse, SYN_QUE_IDENTIFY, id))
  		return -1;
  	priv->identity = (id[0]<<16) | (id[1]<<8) | id[2];
  	if (SYN_ID_IS_SYNAPTICS(priv->identity))
  		return 0;
  	return -1;
  }
  
  /*
   * Read touchpad resolution and maximum reported coordinates
   * Resolution is left zero if touchpad does not support the query
   */
  
  static const int *quirk_min_max;
  
  static int synaptics_resolution(struct psmouse *psmouse)
  {
  	struct synaptics_data *priv = psmouse->private;
  	unsigned char resp[3];
  
  	if (quirk_min_max) {
  		priv->x_min = quirk_min_max[0];
  		priv->x_max = quirk_min_max[1];
  		priv->y_min = quirk_min_max[2];
  		priv->y_max = quirk_min_max[3];
  		return 0;
  	}
  
  	if (SYN_ID_MAJOR(priv->identity) < 4)
  		return 0;
  
  	if (synaptics_send_cmd(psmouse, SYN_QUE_RESOLUTION, resp) == 0) {
  		if (resp[0] != 0 && (resp[1] & 0x80) && resp[2] != 0) {
  			priv->x_res = resp[0]; /* x resolution in units/mm */
  			priv->y_res = resp[2]; /* y resolution in units/mm */
  		}
  	}
  
  	if (SYN_EXT_CAP_REQUESTS(priv->capabilities) >= 5 &&
  	    SYN_CAP_MAX_DIMENSIONS(priv->ext_cap_0c)) {
  		if (synaptics_send_cmd(psmouse, SYN_QUE_EXT_MAX_COORDS, resp)) {
  			psmouse_warn(psmouse,
  				     "device claims to have max coordinates query, but I'm not able to read it.\n");
  		} else {
  			priv->x_max = (resp[0] << 5) | ((resp[1] & 0x0f) << 1);
  			priv->y_max = (resp[2] << 5) | ((resp[1] & 0xf0) >> 3);
  		}
  	}
  
  	if (SYN_EXT_CAP_REQUESTS(priv->capabilities) >= 7 &&
  	    SYN_CAP_MIN_DIMENSIONS(priv->ext_cap_0c)) {
  		if (synaptics_send_cmd(psmouse, SYN_QUE_EXT_MIN_COORDS, resp)) {
  			psmouse_warn(psmouse,
  				     "device claims to have min coordinates query, but I'm not able to read it.\n");
  		} else {
  			priv->x_min = (resp[0] << 5) | ((resp[1] & 0x0f) << 1);
  			priv->y_min = (resp[2] << 5) | ((resp[1] & 0xf0) >> 3);
  		}
  	}
  
  	return 0;
  }
  
  static int synaptics_query_hardware(struct psmouse *psmouse)
  {
  	if (synaptics_identify(psmouse))
  		return -1;
  	if (synaptics_model_id(psmouse))
  		return -1;
  	if (synaptics_firmware_id(psmouse))
  		return -1;
  	if (synaptics_board_id(psmouse))
  		return -1;
  	if (synaptics_capability(psmouse))
  		return -1;
  	if (synaptics_resolution(psmouse))
  		return -1;
  
  	return 0;
  }
  
  static int synaptics_set_advanced_gesture_mode(struct psmouse *psmouse)
  {
  	static unsigned char param = 0xc8;
  	struct synaptics_data *priv = psmouse->private;
  
  	if (!(SYN_CAP_ADV_GESTURE(priv->ext_cap_0c) ||
  	      SYN_CAP_IMAGE_SENSOR(priv->ext_cap_0c)))
  		return 0;
  
  	if (psmouse_sliced_command(psmouse, SYN_QUE_MODEL))
  		return -1;
  
  	if (ps2_command(&psmouse->ps2dev, &param, PSMOUSE_CMD_SETRATE))
  		return -1;
  
  	/* Advanced gesture mode also sends multi finger data */
  	priv->capabilities |= BIT(1);
  
  	return 0;
  }
  
  static int synaptics_set_mode(struct psmouse *psmouse)
  {
  	struct synaptics_data *priv = psmouse->private;
  
  	priv->mode = 0;
  	if (priv->absolute_mode)
  		priv->mode |= SYN_BIT_ABSOLUTE_MODE;
  	if (priv->disable_gesture)
  		priv->mode |= SYN_BIT_DISABLE_GESTURE;
  	if (psmouse->rate >= 80)
  		priv->mode |= SYN_BIT_HIGH_RATE;
  	if (SYN_CAP_EXTENDED(priv->capabilities))
  		priv->mode |= SYN_BIT_W_MODE;
  
  	if (synaptics_mode_cmd(psmouse, priv->mode))
  		return -1;
  
  	if (priv->absolute_mode &&
  	    synaptics_set_advanced_gesture_mode(psmouse)) {
  		psmouse_err(psmouse, "Advanced gesture mode init failed.\n");
  		return -1;
  	}
  
  	return 0;
  }
  
  static void synaptics_set_rate(struct psmouse *psmouse, unsigned int rate)
  {
  	struct synaptics_data *priv = psmouse->private;
  
  	if (rate >= 80) {
  		priv->mode |= SYN_BIT_HIGH_RATE;
  		psmouse->rate = 80;
  	} else {
  		priv->mode &= ~SYN_BIT_HIGH_RATE;
  		psmouse->rate = 40;
  	}
  
  	synaptics_mode_cmd(psmouse, priv->mode);
  }
  
  /*****************************************************************************
   *	Synaptics pass-through PS/2 port support
   ****************************************************************************/
  static int synaptics_pt_write(struct serio *serio, unsigned char c)
  {
  	struct psmouse *parent = serio_get_drvdata(serio->parent);
  	char rate_param = SYN_PS_CLIENT_CMD; /* indicates that we want pass-through port */
  
  	if (psmouse_sliced_command(parent, c))
  		return -1;
  	if (ps2_command(&parent->ps2dev, &rate_param, PSMOUSE_CMD_SETRATE))
  		return -1;
  	return 0;
  }
  
  static int synaptics_pt_start(struct serio *serio)
  {
  	struct psmouse *parent = serio_get_drvdata(serio->parent);
  	struct synaptics_data *priv = parent->private;
  
  	serio_pause_rx(parent->ps2dev.serio);
  	priv->pt_port = serio;
  	serio_continue_rx(parent->ps2dev.serio);
  
  	return 0;
  }
  
  static void synaptics_pt_stop(struct serio *serio)
  {
  	struct psmouse *parent = serio_get_drvdata(serio->parent);
  	struct synaptics_data *priv = parent->private;
  
  	serio_pause_rx(parent->ps2dev.serio);
  	priv->pt_port = NULL;
  	serio_continue_rx(parent->ps2dev.serio);
  }
  
  static int synaptics_is_pt_packet(unsigned char *buf)
  {
  	return (buf[0] & 0xFC) == 0x84 && (buf[3] & 0xCC) == 0xC4;
  }
  
  static void synaptics_pass_pt_packet(struct serio *ptport, unsigned char *packet)
  {
  	struct psmouse *child = serio_get_drvdata(ptport);
  
  	if (child && child->state == PSMOUSE_ACTIVATED) {
  		serio_interrupt(ptport, packet[1], 0);
  		serio_interrupt(ptport, packet[4], 0);
  		serio_interrupt(ptport, packet[5], 0);
  		if (child->pktsize == 4)
  			serio_interrupt(ptport, packet[2], 0);
  	} else
  		serio_interrupt(ptport, packet[1], 0);
  }
  
  static void synaptics_pt_activate(struct psmouse *psmouse)
  {
  	struct synaptics_data *priv = psmouse->private;
  	struct psmouse *child = serio_get_drvdata(priv->pt_port);
  
  	/* adjust the touchpad to child's choice of protocol */
  	if (child) {
  		if (child->pktsize == 4)
  			priv->mode |= SYN_BIT_FOUR_BYTE_CLIENT;
  		else
  			priv->mode &= ~SYN_BIT_FOUR_BYTE_CLIENT;
  
  		if (synaptics_mode_cmd(psmouse, priv->mode))
  			psmouse_warn(psmouse,
  				     "failed to switch guest protocol\n");
  	}
  }
  
  static void synaptics_pt_create(struct psmouse *psmouse)
  {
  	struct serio *serio;
  
  	serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
  	if (!serio) {
  		psmouse_err(psmouse,
  			    "not enough memory for pass-through port\n");
  		return;
  	}
  
  	serio->id.type = SERIO_PS_PSTHRU;
  	strlcpy(serio->name, "Synaptics pass-through", sizeof(serio->name));
  	strlcpy(serio->phys, "synaptics-pt/serio0", sizeof(serio->name));
  	serio->write = synaptics_pt_write;
  	serio->start = synaptics_pt_start;
  	serio->stop = synaptics_pt_stop;
  	serio->parent = psmouse->ps2dev.serio;
  
  	psmouse->pt_activate = synaptics_pt_activate;
  
  	psmouse_info(psmouse, "serio: %s port at %s\n",
  		     serio->name, psmouse->phys);
  	serio_register_port(serio);
  }
  
  /*****************************************************************************
   *	Functions to interpret the absolute mode packets
   ****************************************************************************/
  
  static void synaptics_mt_state_set(struct synaptics_mt_state *state, int count,
  				   int sgm, int agm)
  {
  	state->count = count;
  	state->sgm = sgm;
  	state->agm = agm;
  }
  
  static void synaptics_parse_agm(const unsigned char buf[],
  				struct synaptics_data *priv,
  				struct synaptics_hw_state *hw)
  {
  	struct synaptics_hw_state *agm = &priv->agm;
  	int agm_packet_type;
  
  	agm_packet_type = (buf[5] & 0x30) >> 4;
  	switch (agm_packet_type) {
  	case 1:
  		/* Gesture packet: (x, y, z) half resolution */
  		agm->w = hw->w;
  		agm->x = (((buf[4] & 0x0f) << 8) | buf[1]) << 1;
  		agm->y = (((buf[4] & 0xf0) << 4) | buf[2]) << 1;
  		agm->z = ((buf[3] & 0x30) | (buf[5] & 0x0f)) << 1;
  		break;
  
  	case 2:
  		/* AGM-CONTACT packet: (count, sgm, agm) */
  		synaptics_mt_state_set(&agm->mt_state, buf[1], buf[2], buf[4]);
  		break;
  
  	default:
  		break;
  	}
  
  	/* Record that at least one AGM has been received since last SGM */
  	priv->agm_pending = true;
  }
  
  static int synaptics_parse_hw_state(const unsigned char buf[],
  				    struct synaptics_data *priv,
  				    struct synaptics_hw_state *hw)
  {
  	memset(hw, 0, sizeof(struct synaptics_hw_state));
  
  	if (SYN_MODEL_NEWABS(priv->model_id)) {
  		hw->w = (((buf[0] & 0x30) >> 2) |
  			 ((buf[0] & 0x04) >> 1) |
  			 ((buf[3] & 0x04) >> 2));
  
  		if ((SYN_CAP_ADV_GESTURE(priv->ext_cap_0c) ||
  			SYN_CAP_IMAGE_SENSOR(priv->ext_cap_0c)) &&
  		    hw->w == 2) {
  			synaptics_parse_agm(buf, priv, hw);
  			return 1;
  		}
  
  		hw->x = (((buf[3] & 0x10) << 8) |
  			 ((buf[1] & 0x0f) << 8) |
  			 buf[4]);
  		hw->y = (((buf[3] & 0x20) << 7) |
  			 ((buf[1] & 0xf0) << 4) |
  			 buf[5]);
  		hw->z = buf[2];
  
  		hw->left  = (buf[0] & 0x01) ? 1 : 0;
  		hw->right = (buf[0] & 0x02) ? 1 : 0;
  
  		if (SYN_CAP_FORCEPAD(priv->ext_cap_0c)) {
  			/*
  			 * ForcePads, like Clickpads, use middle button
  			 * bits to report primary button clicks.
  			 * Unfortunately they report primary button not
  			 * only when user presses on the pad above certain
  			 * threshold, but also when there are more than one
  			 * finger on the touchpad, which interferes with
  			 * out multi-finger gestures.
  			 */
  			if (hw->z == 0) {
  				/* No contacts */
  				priv->press = priv->report_press = false;
  			} else if (hw->w >= 4 && ((buf[0] ^ buf[3]) & 0x01)) {
  				/*
  				 * Single-finger touch with pressure above
  				 * the threshold. If pressure stays long
  				 * enough, we'll start reporting primary
  				 * button. We rely on the device continuing
  				 * sending data even if finger does not
  				 * move.
  				 */
  				if  (!priv->press) {
  					priv->press_start = jiffies;
  					priv->press = true;
  				} else if (time_after(jiffies,
  						priv->press_start +
  							msecs_to_jiffies(50))) {
  					priv->report_press = true;
  				}
  			} else {
  				priv->press = false;
  			}
  
  			hw->left = priv->report_press;
  
  		} else if (SYN_CAP_CLICKPAD(priv->ext_cap_0c)) {
  			/*
  			 * Clickpad's button is transmitted as middle button,
  			 * however, since it is primary button, we will report
  			 * it as BTN_LEFT.
  			 */
  			hw->left = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
  
  		} else if (SYN_CAP_MIDDLE_BUTTON(priv->capabilities)) {
  			hw->middle = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
  			if (hw->w == 2)
  				hw->scroll = (signed char)(buf[1]);
  		}
  
  		if (SYN_CAP_FOUR_BUTTON(priv->capabilities)) {
  			hw->up   = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
  			hw->down = ((buf[0] ^ buf[3]) & 0x02) ? 1 : 0;
  		}
  
  		if (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) &&
  		    ((buf[0] ^ buf[3]) & 0x02)) {
  			switch (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) & ~0x01) {
  			default:
  				/*
  				 * if nExtBtn is greater than 8 it should be
  				 * considered invalid and treated as 0
  				 */
  				break;
  			case 8:
  				hw->ext_buttons |= ((buf[5] & 0x08)) ? 0x80 : 0;
  				hw->ext_buttons |= ((buf[4] & 0x08)) ? 0x40 : 0;
  			case 6:
  				hw->ext_buttons |= ((buf[5] & 0x04)) ? 0x20 : 0;
  				hw->ext_buttons |= ((buf[4] & 0x04)) ? 0x10 : 0;
  			case 4:
  				hw->ext_buttons |= ((buf[5] & 0x02)) ? 0x08 : 0;
  				hw->ext_buttons |= ((buf[4] & 0x02)) ? 0x04 : 0;
  			case 2:
  				hw->ext_buttons |= ((buf[5] & 0x01)) ? 0x02 : 0;
  				hw->ext_buttons |= ((buf[4] & 0x01)) ? 0x01 : 0;
  			}
  		}
  	} else {
  		hw->x = (((buf[1] & 0x1f) << 8) | buf[2]);
  		hw->y = (((buf[4] & 0x1f) << 8) | buf[5]);
  
  		hw->z = (((buf[0] & 0x30) << 2) | (buf[3] & 0x3F));
  		hw->w = (((buf[1] & 0x80) >> 4) | ((buf[0] & 0x04) >> 1));
  
  		hw->left  = (buf[0] & 0x01) ? 1 : 0;
  		hw->right = (buf[0] & 0x02) ? 1 : 0;
  	}
  
  	/*
  	 * Convert wrap-around values to negative. (X|Y)_MAX_POSITIVE
  	 * is used by some firmware to indicate a finger at the edge of
  	 * the touchpad whose precise position cannot be determined, so
  	 * convert these values to the maximum axis value.
  	 */
  	if (hw->x > X_MAX_POSITIVE)
  		hw->x -= 1 << ABS_POS_BITS;
  	else if (hw->x == X_MAX_POSITIVE)
  		hw->x = XMAX;
  
  	if (hw->y > Y_MAX_POSITIVE)
  		hw->y -= 1 << ABS_POS_BITS;
  	else if (hw->y == Y_MAX_POSITIVE)
  		hw->y = YMAX;
  
  	return 0;
  }
  
  static void synaptics_report_semi_mt_slot(struct input_dev *dev, int slot,
  					  bool active, int x, int y)
  {
  	input_mt_slot(dev, slot);
  	input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
  	if (active) {
  		input_report_abs(dev, ABS_MT_POSITION_X, x);
  		input_report_abs(dev, ABS_MT_POSITION_Y, synaptics_invert_y(y));
  	}
  }
  
  static void synaptics_report_semi_mt_data(struct input_dev *dev,
  					  const struct synaptics_hw_state *a,
  					  const struct synaptics_hw_state *b,
  					  int num_fingers)
  {
  	if (num_fingers >= 2) {
  		synaptics_report_semi_mt_slot(dev, 0, true, min(a->x, b->x),
  					      min(a->y, b->y));
  		synaptics_report_semi_mt_slot(dev, 1, true, max(a->x, b->x),
  					      max(a->y, b->y));
  	} else if (num_fingers == 1) {
  		synaptics_report_semi_mt_slot(dev, 0, true, a->x, a->y);
  		synaptics_report_semi_mt_slot(dev, 1, false, 0, 0);
  	} else {
  		synaptics_report_semi_mt_slot(dev, 0, false, 0, 0);
  		synaptics_report_semi_mt_slot(dev, 1, false, 0, 0);
  	}
  }
  
  static void synaptics_report_buttons(struct psmouse *psmouse,
  				     const struct synaptics_hw_state *hw)
  {
  	struct input_dev *dev = psmouse->dev;
  	struct synaptics_data *priv = psmouse->private;
  	int i;
  
  	input_report_key(dev, BTN_LEFT, hw->left);
  	input_report_key(dev, BTN_RIGHT, hw->right);
  
  	if (SYN_CAP_MIDDLE_BUTTON(priv->capabilities))
  		input_report_key(dev, BTN_MIDDLE, hw->middle);
  
  	if (SYN_CAP_FOUR_BUTTON(priv->capabilities)) {
  		input_report_key(dev, BTN_FORWARD, hw->up);
  		input_report_key(dev, BTN_BACK, hw->down);
  	}
  
  	for (i = 0; i < SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap); i++)
  		input_report_key(dev, BTN_0 + i, hw->ext_buttons & (1 << i));
  }
  
  static void synaptics_report_slot(struct input_dev *dev, int slot,
  				  const struct synaptics_hw_state *hw)
  {
  	input_mt_slot(dev, slot);
  	input_mt_report_slot_state(dev, MT_TOOL_FINGER, (hw != NULL));
  	if (!hw)
  		return;
  
  	input_report_abs(dev, ABS_MT_POSITION_X, hw->x);
  	input_report_abs(dev, ABS_MT_POSITION_Y, synaptics_invert_y(hw->y));
  	input_report_abs(dev, ABS_MT_PRESSURE, hw->z);
  }
  
  static void synaptics_report_mt_data(struct psmouse *psmouse,
  				     struct synaptics_mt_state *mt_state,
  				     const struct synaptics_hw_state *sgm)
  {
  	struct input_dev *dev = psmouse->dev;
  	struct synaptics_data *priv = psmouse->private;
  	struct synaptics_hw_state *agm = &priv->agm;
  	struct synaptics_mt_state *old = &priv->mt_state;
  
  	switch (mt_state->count) {
  	case 0:
  		synaptics_report_slot(dev, 0, NULL);
  		synaptics_report_slot(dev, 1, NULL);
  		break;
  	case 1:
  		if (mt_state->sgm == -1) {
  			synaptics_report_slot(dev, 0, NULL);
  			synaptics_report_slot(dev, 1, NULL);
  		} else if (mt_state->sgm == 0) {
  			synaptics_report_slot(dev, 0, sgm);
  			synaptics_report_slot(dev, 1, NULL);
  		} else {
  			synaptics_report_slot(dev, 0, NULL);
  			synaptics_report_slot(dev, 1, sgm);
  		}
  		break;
  	default:
  		/*
  		 * If the finger slot contained in SGM is valid, and either
  		 * hasn't changed, or is new, or the old SGM has now moved to
  		 * AGM, then report SGM in MTB slot 0.
  		 * Otherwise, empty MTB slot 0.
  		 */
  		if (mt_state->sgm != -1 &&
  		    (mt_state->sgm == old->sgm ||
  		     old->sgm == -1 || mt_state->agm == old->sgm))
  			synaptics_report_slot(dev, 0, sgm);
  		else
  			synaptics_report_slot(dev, 0, NULL);
  
  		/*
  		 * If the finger slot contained in AGM is valid, and either
  		 * hasn't changed, or is new, then report AGM in MTB slot 1.
  		 * Otherwise, empty MTB slot 1.
  		 *
  		 * However, in the case where the AGM is new, make sure that
  		 * that it is either the same as the old SGM, or there was no
  		 * SGM.
  		 *
  		 * Otherwise, if the SGM was just 1, and the new AGM is 2, then
  		 * the new AGM will keep the old SGM's tracking ID, which can
  		 * cause apparent drumroll.  This happens if in the following
  		 * valid finger sequence:
  		 *
  		 *  Action                 SGM  AGM (MTB slot:Contact)
  		 *  1. Touch contact 0    (0:0)
  		 *  2. Touch contact 1    (0:0, 1:1)
  		 *  3. Lift  contact 0    (1:1)
  		 *  4. Touch contacts 2,3 (0:2, 1:3)
  		 *
  		 * In step 4, contact 3, in AGM must not be given the same
  		 * tracking ID as contact 1 had in step 3.  To avoid this,
  		 * the first agm with contact 3 is dropped and slot 1 is
  		 * invalidated (tracking ID = -1).
  		 */
  		if (mt_state->agm != -1 &&
  		    (mt_state->agm == old->agm ||
  		     (old->agm == -1 &&
  		      (old->sgm == -1 || mt_state->agm == old->sgm))))
  			synaptics_report_slot(dev, 1, agm);
  		else
  			synaptics_report_slot(dev, 1, NULL);
  		break;
  	}
  
  	/* Don't use active slot count to generate BTN_TOOL events. */
  	input_mt_report_pointer_emulation(dev, false);
  
  	/* Send the number of fingers reported by touchpad itself. */
  	input_mt_report_finger_count(dev, mt_state->count);
  
  	synaptics_report_buttons(psmouse, sgm);
  
  	input_sync(dev);
  }
  
  /* Handle case where mt_state->count = 0 */
  static void synaptics_image_sensor_0f(struct synaptics_data *priv,
  				      struct synaptics_mt_state *mt_state)
  {
  	synaptics_mt_state_set(mt_state, 0, -1, -1);
  	priv->mt_state_lost = false;
  }
  
  /* Handle case where mt_state->count = 1 */
  static void synaptics_image_sensor_1f(struct synaptics_data *priv,
  				      struct synaptics_mt_state *mt_state)
  {
  	struct synaptics_hw_state *agm = &priv->agm;
  	struct synaptics_mt_state *old = &priv->mt_state;
  
  	/*
  	 * If the last AGM was (0,0,0), and there is only one finger left,
  	 * then we absolutely know that SGM contains slot 0, and all other
  	 * fingers have been removed.
  	 */
  	if (priv->agm_pending && agm->z == 0) {
  		synaptics_mt_state_set(mt_state, 1, 0, -1);
  		priv->mt_state_lost = false;
  		return;
  	}
  
  	switch (old->count) {
  	case 0:
  		synaptics_mt_state_set(mt_state, 1, 0, -1);
  		break;
  	case 1:
  		/*
  		 * If mt_state_lost, then the previous transition was 3->1,
  		 * and SGM now contains either slot 0 or 1, but we don't know
  		 * which.  So, we just assume that the SGM now contains slot 1.
  		 *
  		 * If pending AGM and either:
  		 *   (a) the previous SGM slot contains slot 0, or
  		 *   (b) there was no SGM slot
  		 * then, the SGM now contains slot 1
  		 *
  		 * Case (a) happens with very rapid "drum roll" gestures, where
  		 * slot 0 finger is lifted and a new slot 1 finger touches
  		 * within one reporting interval.
  		 *
  		 * Case (b) happens if initially two or more fingers tap
  		 * briefly, and all but one lift before the end of the first
  		 * reporting interval.
  		 *
  		 * (In both these cases, slot 0 will becomes empty, so SGM
  		 * contains slot 1 with the new finger)
  		 *
  		 * Else, if there was no previous SGM, it now contains slot 0.
  		 *
  		 * Otherwise, SGM still contains the same slot.
  		 */
  		if (priv->mt_state_lost ||
  		    (priv->agm_pending && old->sgm <= 0))
  			synaptics_mt_state_set(mt_state, 1, 1, -1);
  		else if (old->sgm == -1)
  			synaptics_mt_state_set(mt_state, 1, 0, -1);
  		break;
  	case 2:
  		/*
  		 * If mt_state_lost, we don't know which finger SGM contains.
  		 *
  		 * So, report 1 finger, but with both slots empty.
  		 * We will use slot 1 on subsequent 1->1
  		 */
  		if (priv->mt_state_lost) {
  			synaptics_mt_state_set(mt_state, 1, -1, -1);
  			break;
  		}
  		/*
  		 * Since the last AGM was NOT (0,0,0), it was the finger in
  		 * slot 0 that has been removed.
  		 * So, SGM now contains previous AGM's slot, and AGM is now
  		 * empty.
  		 */
  		synaptics_mt_state_set(mt_state, 1, old->agm, -1);
  		break;
  	case 3:
  		/*
  		 * Since last AGM was not (0,0,0), we don't know which finger
  		 * is left.
  		 *
  		 * So, report 1 finger, but with both slots empty.
  		 * We will use slot 1 on subsequent 1->1
  		 */
  		synaptics_mt_state_set(mt_state, 1, -1, -1);
  		priv->mt_state_lost = true;
  		break;
  	case 4:
  	case 5:
  		/* mt_state was updated by AGM-CONTACT packet */
  		break;
  	}
  }
  
  /* Handle case where mt_state->count = 2 */
  static void synaptics_image_sensor_2f(struct synaptics_data *priv,
  				      struct synaptics_mt_state *mt_state)
  {
  	struct synaptics_mt_state *old = &priv->mt_state;
  
  	switch (old->count) {
  	case 0:
  		synaptics_mt_state_set(mt_state, 2, 0, 1);
  		break;
  	case 1:
  		/*
  		 * If previous SGM contained slot 1 or higher, SGM now contains
  		 * slot 0 (the newly touching finger) and AGM contains SGM's
  		 * previous slot.
  		 *
  		 * Otherwise, SGM still contains slot 0 and AGM now contains
  		 * slot 1.
  		 */
  		if (old->sgm >= 1)
  			synaptics_mt_state_set(mt_state, 2, 0, old->sgm);
  		else
  			synaptics_mt_state_set(mt_state, 2, 0, 1);
  		break;
  	case 2:
  		/*
  		 * If mt_state_lost, SGM now contains either finger 1 or 2, but
  		 * we don't know which.
  		 * So, we just assume that the SGM contains slot 0 and AGM 1.
  		 */
  		if (priv->mt_state_lost)
  			synaptics_mt_state_set(mt_state, 2, 0, 1);
  		/*
  		 * Otherwise, use the same mt_state, since it either hasn't
  		 * changed, or was updated by a recently received AGM-CONTACT
  		 * packet.
  		 */
  		break;
  	case 3:
  		/*
  		 * 3->2 transitions have two unsolvable problems:
  		 *  1) no indication is given which finger was removed
  		 *  2) no way to tell if agm packet was for finger 3
  		 *     before 3->2, or finger 2 after 3->2.
  		 *
  		 * So, report 2 fingers, but empty all slots.
  		 * We will guess slots [0,1] on subsequent 2->2.
  		 */
  		synaptics_mt_state_set(mt_state, 2, -1, -1);
  		priv->mt_state_lost = true;
  		break;
  	case 4:
  	case 5:
  		/* mt_state was updated by AGM-CONTACT packet */
  		break;
  	}
  }
  
  /* Handle case where mt_state->count = 3 */
  static void synaptics_image_sensor_3f(struct synaptics_data *priv,
  				      struct synaptics_mt_state *mt_state)
  {
  	struct synaptics_mt_state *old = &priv->mt_state;
  
  	switch (old->count) {
  	case 0:
  		synaptics_mt_state_set(mt_state, 3, 0, 2);
  		break;
  	case 1:
  		/*
  		 * If previous SGM contained slot 2 or higher, SGM now contains
  		 * slot 0 (one of the newly touching fingers) and AGM contains
  		 * SGM's previous slot.
  		 *
  		 * Otherwise, SGM now contains slot 0 and AGM contains slot 2.
  		 */
  		if (old->sgm >= 2)
  			synaptics_mt_state_set(mt_state, 3, 0, old->sgm);
  		else
  			synaptics_mt_state_set(mt_state, 3, 0, 2);
  		break;
  	case 2:
  		/*
  		 * If the AGM previously contained slot 3 or higher, then the
  		 * newly touching finger is in the lowest available slot.
  		 *
  		 * If SGM was previously 1 or higher, then the new SGM is
  		 * now slot 0 (with a new finger), otherwise, the new finger
  		 * is now in a hidden slot between 0 and AGM's slot.
  		 *
  		 * In all such cases, the SGM now contains slot 0, and the AGM
  		 * continues to contain the same slot as before.
  		 */
  		if (old->agm >= 3) {
  			synaptics_mt_state_set(mt_state, 3, 0, old->agm);
  			break;
  		}
  
  		/*
  		 * After some 3->1 and all 3->2 transitions, we lose track
  		 * of which slot is reported by SGM and AGM.
  		 *
  		 * For 2->3 in this state, report 3 fingers, but empty all
  		 * slots, and we will guess (0,2) on a subsequent 0->3.
  		 *
  		 * To userspace, the resulting transition will look like:
  		 *    2:[0,1] -> 3:[-1,-1] -> 3:[0,2]
  		 */
  		if (priv->mt_state_lost) {
  			synaptics_mt_state_set(mt_state, 3, -1, -1);
  			break;
  		}
  
  		/*
  		 * If the (SGM,AGM) really previously contained slots (0, 1),
  		 * then we cannot know what slot was just reported by the AGM,
  		 * because the 2->3 transition can occur either before or after
  		 * the AGM packet. Thus, this most recent AGM could contain
  		 * either the same old slot 1 or the new slot 2.
  		 * Subsequent AGMs will be reporting slot 2.
  		 *
  		 * To userspace, the resulting transition will look like:
  		 *    2:[0,1] -> 3:[0,-1] -> 3:[0,2]
  		 */
  		synaptics_mt_state_set(mt_state, 3, 0, -1);
  		break;
  	case 3:
  		/*
  		 * If, for whatever reason, the previous agm was invalid,
  		 * Assume SGM now contains slot 0, AGM now contains slot 2.
  		 */
  		if (old->agm <= 2)
  			synaptics_mt_state_set(mt_state, 3, 0, 2);
  		/*
  		 * mt_state either hasn't changed, or was updated by a recently
  		 * received AGM-CONTACT packet.
  		 */
  		break;
  
  	case 4:
  	case 5:
  		/* mt_state was updated by AGM-CONTACT packet */
  		break;
  	}
  }
  
  /* Handle case where mt_state->count = 4, or = 5 */
  static void synaptics_image_sensor_45f(struct synaptics_data *priv,
  				       struct synaptics_mt_state *mt_state)
  {
  	/* mt_state was updated correctly by AGM-CONTACT packet */
  	priv->mt_state_lost = false;
  }
  
  static void synaptics_image_sensor_process(struct psmouse *psmouse,
  					   struct synaptics_hw_state *sgm)
  {
  	struct synaptics_data *priv = psmouse->private;
  	struct synaptics_hw_state *agm = &priv->agm;
  	struct synaptics_mt_state mt_state;
  
  	/* Initialize using current mt_state (as updated by last agm) */
  	mt_state = agm->mt_state;
  
  	/*
  	 * Update mt_state using the new finger count and current mt_state.
  	 */
  	if (sgm->z == 0)
  		synaptics_image_sensor_0f(priv, &mt_state);
  	else if (sgm->w >= 4)
  		synaptics_image_sensor_1f(priv, &mt_state);
  	else if (sgm->w == 0)
  		synaptics_image_sensor_2f(priv, &mt_state);
  	else if (sgm->w == 1 && mt_state.count <= 3)
  		synaptics_image_sensor_3f(priv, &mt_state);
  	else
  		synaptics_image_sensor_45f(priv, &mt_state);
  
  	/* Send resulting input events to user space */
  	synaptics_report_mt_data(psmouse, &mt_state, sgm);
  
  	/* Store updated mt_state */
  	priv->mt_state = agm->mt_state = mt_state;
  	priv->agm_pending = false;
  }
  
  /*
   *  called for each full received packet from the touchpad
   */
  static void synaptics_process_packet(struct psmouse *psmouse)
  {
  	struct input_dev *dev = psmouse->dev;
  	struct synaptics_data *priv = psmouse->private;
  	struct synaptics_hw_state hw;
  	int num_fingers;
  	int finger_width;
  
  	if (synaptics_parse_hw_state(psmouse->packet, priv, &hw))
  		return;
  
  	if (SYN_CAP_IMAGE_SENSOR(priv->ext_cap_0c)) {
  		synaptics_image_sensor_process(psmouse, &hw);
  		return;
  	}
  
  	if (hw.scroll) {
  		priv->scroll += hw.scroll;
  
  		while (priv->scroll >= 4) {
  			input_report_key(dev, BTN_BACK, !hw.down);
  			input_sync(dev);
  			input_report_key(dev, BTN_BACK, hw.down);
  			input_sync(dev);
  			priv->scroll -= 4;
  		}
  		while (priv->scroll <= -4) {
  			input_report_key(dev, BTN_FORWARD, !hw.up);
  			input_sync(dev);
  			input_report_key(dev, BTN_FORWARD, hw.up);
  			input_sync(dev);
  			priv->scroll += 4;
  		}
  		return;
  	}
  
  	if (hw.z > 0 && hw.x > 1) {
  		num_fingers = 1;
  		finger_width = 5;
  		if (SYN_CAP_EXTENDED(priv->capabilities)) {
  			switch (hw.w) {
  			case 0 ... 1:
  				if (SYN_CAP_MULTIFINGER(priv->capabilities))
  					num_fingers = hw.w + 2;
  				break;
  			case 2:
  				if (SYN_MODEL_PEN(priv->model_id))
  					;   /* Nothing, treat a pen as a single finger */
  				break;
  			case 4 ... 15:
  				if (SYN_CAP_PALMDETECT(priv->capabilities))
  					finger_width = hw.w;
  				break;
  			}
  		}
  	} else {
  		num_fingers = 0;
  		finger_width = 0;
  	}
  
  	if (SYN_CAP_ADV_GESTURE(priv->ext_cap_0c))
  		synaptics_report_semi_mt_data(dev, &hw, &priv->agm,
  					      num_fingers);
  
  	/* Post events
  	 * BTN_TOUCH has to be first as mousedev relies on it when doing
  	 * absolute -> relative conversion
  	 */
  	if (hw.z > 30) input_report_key(dev, BTN_TOUCH, 1);
  	if (hw.z < 25) input_report_key(dev, BTN_TOUCH, 0);
  
  	if (num_fingers > 0) {
  		input_report_abs(dev, ABS_X, hw.x);
  		input_report_abs(dev, ABS_Y, synaptics_invert_y(hw.y));
  	}
  	input_report_abs(dev, ABS_PRESSURE, hw.z);
  
  	if (SYN_CAP_PALMDETECT(priv->capabilities))
  		input_report_abs(dev, ABS_TOOL_WIDTH, finger_width);
  
  	input_report_key(dev, BTN_TOOL_FINGER, num_fingers == 1);
  	if (SYN_CAP_MULTIFINGER(priv->capabilities)) {
  		input_report_key(dev, BTN_TOOL_DOUBLETAP, num_fingers == 2);
  		input_report_key(dev, BTN_TOOL_TRIPLETAP, num_fingers == 3);
  	}
  
  	synaptics_report_buttons(psmouse, &hw);
  
  	input_sync(dev);
  }
  
  static int synaptics_validate_byte(struct psmouse *psmouse,
  				   int idx, unsigned char pkt_type)
  {
  	static const unsigned char newabs_mask[]	= { 0xC8, 0x00, 0x00, 0xC8, 0x00 };
  	static const unsigned char newabs_rel_mask[]	= { 0xC0, 0x00, 0x00, 0xC0, 0x00 };
  	static const unsigned char newabs_rslt[]	= { 0x80, 0x00, 0x00, 0xC0, 0x00 };
  	static const unsigned char oldabs_mask[]	= { 0xC0, 0x60, 0x00, 0xC0, 0x60 };
  	static const unsigned char oldabs_rslt[]	= { 0xC0, 0x00, 0x00, 0x80, 0x00 };
  	const char *packet = psmouse->packet;
  
  	if (idx < 0 || idx > 4)
  		return 0;
  
  	switch (pkt_type) {
  
  	case SYN_NEWABS:
  	case SYN_NEWABS_RELAXED:
  		return (packet[idx] & newabs_rel_mask[idx]) == newabs_rslt[idx];
  
  	case SYN_NEWABS_STRICT:
  		return (packet[idx] & newabs_mask[idx]) == newabs_rslt[idx];
  
  	case SYN_OLDABS:
  		return (packet[idx] & oldabs_mask[idx]) == oldabs_rslt[idx];
  
  	default:
  		psmouse_err(psmouse, "unknown packet type %d\n", pkt_type);
  		return 0;
  	}
  }
  
  static unsigned char synaptics_detect_pkt_type(struct psmouse *psmouse)
  {
  	int i;
  
  	for (i = 0; i < 5; i++)
  		if (!synaptics_validate_byte(psmouse, i, SYN_NEWABS_STRICT)) {
  			psmouse_info(psmouse, "using relaxed packet validation\n");
  			return SYN_NEWABS_RELAXED;
  		}
  
  	return SYN_NEWABS_STRICT;
  }
  
  static psmouse_ret_t synaptics_process_byte(struct psmouse *psmouse)
  {
  	struct synaptics_data *priv = psmouse->private;
  
  	if (psmouse->pktcnt >= 6) { /* Full packet received */
  		if (unlikely(priv->pkt_type == SYN_NEWABS))
  			priv->pkt_type = synaptics_detect_pkt_type(psmouse);
  
  		if (SYN_CAP_PASS_THROUGH(priv->capabilities) &&
  		    synaptics_is_pt_packet(psmouse->packet)) {
  			if (priv->pt_port)
  				synaptics_pass_pt_packet(priv->pt_port, psmouse->packet);
  		} else
  			synaptics_process_packet(psmouse);
  
  		return PSMOUSE_FULL_PACKET;
  	}
  
  	return synaptics_validate_byte(psmouse, psmouse->pktcnt - 1, priv->pkt_type) ?
  		PSMOUSE_GOOD_DATA : PSMOUSE_BAD_DATA;
  }
  
  /*****************************************************************************
   *	Driver initialization/cleanup functions
   ****************************************************************************/
  static void set_abs_position_params(struct input_dev *dev,
  				    struct synaptics_data *priv, int x_code,
  				    int y_code)
  {
  	int x_min = priv->x_min ?: XMIN_NOMINAL;
  	int x_max = priv->x_max ?: XMAX_NOMINAL;
  	int y_min = priv->y_min ?: YMIN_NOMINAL;
  	int y_max = priv->y_max ?: YMAX_NOMINAL;
  	int fuzz = SYN_CAP_REDUCED_FILTERING(priv->ext_cap_0c) ?
  			SYN_REDUCED_FILTER_FUZZ : 0;
  
  	input_set_abs_params(dev, x_code, x_min, x_max, fuzz, 0);
  	input_set_abs_params(dev, y_code, y_min, y_max, fuzz, 0);
  	input_abs_set_res(dev, x_code, priv->x_res);
  	input_abs_set_res(dev, y_code, priv->y_res);
  }
  
  static void set_input_params(struct input_dev *dev, struct synaptics_data *priv)
  {
  	int i;
  
  	/* Things that apply to both modes */
  	__set_bit(INPUT_PROP_POINTER, dev->propbit);
  	__set_bit(EV_KEY, dev->evbit);
  	__set_bit(BTN_LEFT, dev->keybit);
  	__set_bit(BTN_RIGHT, dev->keybit);
  
  	if (SYN_CAP_MIDDLE_BUTTON(priv->capabilities))
  		__set_bit(BTN_MIDDLE, dev->keybit);
  
  	if (!priv->absolute_mode) {
  		/* Relative mode */
  		__set_bit(EV_REL, dev->evbit);
  		__set_bit(REL_X, dev->relbit);
  		__set_bit(REL_Y, dev->relbit);
  		return;
  	}
  
  	/* Absolute mode */
  	__set_bit(EV_ABS, dev->evbit);
  	set_abs_position_params(dev, priv, ABS_X, ABS_Y);
  	input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0);
  
  	if (SYN_CAP_IMAGE_SENSOR(priv->ext_cap_0c)) {
  		set_abs_position_params(dev, priv, ABS_MT_POSITION_X,
  					ABS_MT_POSITION_Y);
  		/* Image sensors can report per-contact pressure */
  		input_set_abs_params(dev, ABS_MT_PRESSURE, 0, 255, 0, 0);
  		input_mt_init_slots(dev, 2, INPUT_MT_POINTER);
  
  		/* Image sensors can signal 4 and 5 finger clicks */
  		__set_bit(BTN_TOOL_QUADTAP, dev->keybit);
  		__set_bit(BTN_TOOL_QUINTTAP, dev->keybit);
  	} else if (SYN_CAP_ADV_GESTURE(priv->ext_cap_0c)) {
  		/* Non-image sensors with AGM use semi-mt */
  		__set_bit(INPUT_PROP_SEMI_MT, dev->propbit);
  		input_mt_init_slots(dev, 2, 0);
  		set_abs_position_params(dev, priv, ABS_MT_POSITION_X,
  					ABS_MT_POSITION_Y);
  	}
  
  	if (SYN_CAP_PALMDETECT(priv->capabilities))
  		input_set_abs_params(dev, ABS_TOOL_WIDTH, 0, 15, 0, 0);
  
  	__set_bit(BTN_TOUCH, dev->keybit);
  	__set_bit(BTN_TOOL_FINGER, dev->keybit);
  
  	if (SYN_CAP_MULTIFINGER(priv->capabilities)) {
  		__set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
  		__set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
  	}
  
  	if (SYN_CAP_FOUR_BUTTON(priv->capabilities) ||
  	    SYN_CAP_MIDDLE_BUTTON(priv->capabilities)) {
  		__set_bit(BTN_FORWARD, dev->keybit);
  		__set_bit(BTN_BACK, dev->keybit);
  	}
  
  	for (i = 0; i < SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap); i++)
  		__set_bit(BTN_0 + i, dev->keybit);
  
  	__clear_bit(EV_REL, dev->evbit);
  	__clear_bit(REL_X, dev->relbit);
  	__clear_bit(REL_Y, dev->relbit);
  
  	if (SYN_CAP_CLICKPAD(priv->ext_cap_0c)) {
  		__set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
  		/* Clickpads report only left button */
  		__clear_bit(BTN_RIGHT, dev->keybit);
  		__clear_bit(BTN_MIDDLE, dev->keybit);
  	}
  }
  
  static ssize_t synaptics_show_disable_gesture(struct psmouse *psmouse,
  					      void *data, char *buf)
  {
  	struct synaptics_data *priv = psmouse->private;
  
  	return sprintf(buf, "%c\n", priv->disable_gesture ? '1' : '0');
  }
  
  static ssize_t synaptics_set_disable_gesture(struct psmouse *psmouse,
  					     void *data, const char *buf,
  					     size_t len)
  {
  	struct synaptics_data *priv = psmouse->private;
  	unsigned int value;
  	int err;
  
  	err = kstrtouint(buf, 10, &value);
  	if (err)
  		return err;
  
  	if (value > 1)
  		return -EINVAL;
  
  	if (value == priv->disable_gesture)
  		return len;
  
  	priv->disable_gesture = value;
  	if (value)
  		priv->mode |= SYN_BIT_DISABLE_GESTURE;
  	else
  		priv->mode &= ~SYN_BIT_DISABLE_GESTURE;
  
  	if (synaptics_mode_cmd(psmouse, priv->mode))
  		return -EIO;
  
  	return len;
  }
  
  PSMOUSE_DEFINE_ATTR(disable_gesture, S_IWUSR | S_IRUGO, NULL,
  		    synaptics_show_disable_gesture,
  		    synaptics_set_disable_gesture);
  
  static void synaptics_disconnect(struct psmouse *psmouse)
  {
  	struct synaptics_data *priv = psmouse->private;
  
  	if (!priv->absolute_mode && SYN_ID_DISGEST_SUPPORTED(priv->identity))
  		device_remove_file(&psmouse->ps2dev.serio->dev,
  				   &psmouse_attr_disable_gesture.dattr);
  
  	synaptics_reset(psmouse);
  	kfree(priv);
  	psmouse->private = NULL;
  }
  
  static int synaptics_reconnect(struct psmouse *psmouse)
  {
  	struct synaptics_data *priv = psmouse->private;
  	struct synaptics_data old_priv = *priv;
  	unsigned char param[2];
  	int retry = 0;
  	int error;
  
  	do {
  		psmouse_reset(psmouse);
  		if (retry) {
  			/*
  			 * On some boxes, right after resuming, the touchpad
  			 * needs some time to finish initializing (I assume
  			 * it needs time to calibrate) and start responding
  			 * to Synaptics-specific queries, so let's wait a
  			 * bit.
  			 */
  			ssleep(1);
  		}
  		ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETID);
  		error = synaptics_detect(psmouse, 0);
  	} while (error && ++retry < 3);
  
  	if (error)
  		return -1;
  
  	if (retry > 1)
  		psmouse_dbg(psmouse, "reconnected after %d tries\n", retry);
  
  	if (synaptics_query_hardware(psmouse)) {
  		psmouse_err(psmouse, "Unable to query device.\n");
  		return -1;
  	}
  
  	if (synaptics_set_mode(psmouse)) {
  		psmouse_err(psmouse, "Unable to initialize device.\n");
  		return -1;
  	}
  
  	if (old_priv.identity != priv->identity ||
  	    old_priv.model_id != priv->model_id ||
  	    old_priv.capabilities != priv->capabilities ||
  	    old_priv.ext_cap != priv->ext_cap) {
  		psmouse_err(psmouse,
  			    "hardware appears to be different: id(%ld-%ld), model(%ld-%ld), caps(%lx-%lx), ext(%lx-%lx).\n",
  			    old_priv.identity, priv->identity,
  			    old_priv.model_id, priv->model_id,
  			    old_priv.capabilities, priv->capabilities,
  			    old_priv.ext_cap, priv->ext_cap);
  		return -1;
  	}
  
  	return 0;
  }
  
  static bool impaired_toshiba_kbc;
  
  static const struct dmi_system_id __initconst toshiba_dmi_table[] = {
  #if defined(CONFIG_DMI) && defined(CONFIG_X86)
  	{
  		/* Toshiba Satellite */
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  			DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  		},
  	},
  	{
  		/* Toshiba Dynabook */
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  			DMI_MATCH(DMI_PRODUCT_NAME, "dynabook"),
  		},
  	},
  	{
  		/* Toshiba Portege M300 */
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  			DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE M300"),
  		},
  
  	},
  	{
  		/* Toshiba Portege M300 */
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  			DMI_MATCH(DMI_PRODUCT_NAME, "Portable PC"),
  			DMI_MATCH(DMI_PRODUCT_VERSION, "Version 1.0"),
  		},
  
  	},
  #endif
  	{ }
  };
  
  static bool broken_olpc_ec;
  
  static const struct dmi_system_id __initconst olpc_dmi_table[] = {
  #if defined(CONFIG_DMI) && defined(CONFIG_OLPC)
  	{
  		/* OLPC XO-1 or XO-1.5 */
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "OLPC"),
  			DMI_MATCH(DMI_PRODUCT_NAME, "XO"),
  		},
  	},
  #endif
  	{ }
  };
  
  static const struct dmi_system_id min_max_dmi_table[] __initconst = {
  #if defined(CONFIG_DMI)
  	{
  		/* Lenovo ThinkPad Helix */
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
  			DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad Helix"),
  		},
  		.driver_data = (int []){1024, 5052, 2258, 4832},
  	},
  	{
  		/* Lenovo ThinkPad X240 */
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
  			DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X240"),
  		},
  		.driver_data = (int []){1232, 5710, 1156, 4696},
  	},
  	{
  		/* Lenovo ThinkPad Edge E431 */
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
  			DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad Edge E431"),
  		},
  		.driver_data = (int []){1024, 5022, 2508, 4832},
  	},
  	{
  		/* Lenovo ThinkPad T431s */
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
  			DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T431"),
  		},
  		.driver_data = (int []){1024, 5112, 2024, 4832},
  	},
  	{
  		/* Lenovo ThinkPad T440s */
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
  			DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T440"),
  		},
  		.driver_data = (int []){1024, 5112, 2024, 4832},
  	},
  	{
  		/* Lenovo ThinkPad L440 */
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
  			DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad L440"),
  		},
  		.driver_data = (int []){1024, 5112, 2024, 4832},
  	},
  	{
  		/* Lenovo ThinkPad T540p */
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
  			DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T540"),
  		},
  		.driver_data = (int []){1024, 5112, 2024, 4832},
  	},
  	{
  		/* Lenovo ThinkPad L540 */
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
  			DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad L540"),
  		},
  		.driver_data = (int []){1024, 5112, 2024, 4832},
  	},
  	{
  		/* Lenovo ThinkPad W540 */
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
  			DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad W540"),
  		},
  		.driver_data = (int []){1024, 5112, 2024, 4832},
  	},
  	{
  		/* Lenovo Yoga S1 */
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
  			DMI_EXACT_MATCH(DMI_PRODUCT_VERSION,
  					"ThinkPad S1 Yoga"),
  		},
  		.driver_data = (int []){1232, 5710, 1156, 4696},
  	},
  	{
  		/* Lenovo ThinkPad X1 Carbon Haswell (3rd generation) */
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
  			DMI_MATCH(DMI_PRODUCT_VERSION,
  					"ThinkPad X1 Carbon 2nd"),
  		},
  		.driver_data = (int []){1024, 5112, 2024, 4832},
  	},
  #endif
  	{ }
  };
  
  void __init synaptics_module_init(void)
  {
  	const struct dmi_system_id *min_max_dmi;
  
  	impaired_toshiba_kbc = dmi_check_system(toshiba_dmi_table);
  	broken_olpc_ec = dmi_check_system(olpc_dmi_table);
  
  	min_max_dmi = dmi_first_match(min_max_dmi_table);
  	if (min_max_dmi)
  		quirk_min_max = min_max_dmi->driver_data;
  }
  
  static int __synaptics_init(struct psmouse *psmouse, bool absolute_mode)
  {
  	struct synaptics_data *priv;
  	int err = -1;
  
  	/*
  	 * The OLPC XO has issues with Synaptics' absolute mode; the constant
  	 * packet spew overloads the EC such that key presses on the keyboard
  	 * are missed.  Given that, don't even attempt to use Absolute mode.
  	 * Relative mode seems to work just fine.
  	 */
  	if (absolute_mode && broken_olpc_ec) {
  		psmouse_info(psmouse,
  			     "OLPC XO detected, not enabling Synaptics protocol.\n");
  		return -ENODEV;
  	}
  
  	psmouse->private = priv = kzalloc(sizeof(struct synaptics_data), GFP_KERNEL);
  	if (!priv)
  		return -ENOMEM;
  
  	psmouse_reset(psmouse);
  
  	if (synaptics_query_hardware(psmouse)) {
  		psmouse_err(psmouse, "Unable to query device.\n");
  		goto init_fail;
  	}
  
  	priv->absolute_mode = absolute_mode;
  	if (SYN_ID_DISGEST_SUPPORTED(priv->identity))
  		priv->disable_gesture = true;
  
  	if (synaptics_set_mode(psmouse)) {
  		psmouse_err(psmouse, "Unable to initialize device.\n");
  		goto init_fail;
  	}
  
  	priv->pkt_type = SYN_MODEL_NEWABS(priv->model_id) ? SYN_NEWABS : SYN_OLDABS;
  
  	psmouse_info(psmouse,
  		     "Touchpad model: %ld, fw: %ld.%ld, id: %#lx, caps: %#lx/%#lx/%#lx, board id: %lu, fw id: %lu\n",
  		     SYN_ID_MODEL(priv->identity),
  		     SYN_ID_MAJOR(priv->identity), SYN_ID_MINOR(priv->identity),
  		     priv->model_id,
  		     priv->capabilities, priv->ext_cap, priv->ext_cap_0c,
  		     priv->board_id, priv->firmware_id);
  
  	set_input_params(psmouse->dev, priv);
  
  	/*
  	 * Encode touchpad model so that it can be used to set
  	 * input device->id.version and be visible to userspace.
  	 * Because version is __u16 we have to drop something.
  	 * Hardware info bits seem to be good candidates as they
  	 * are documented to be for Synaptics corp. internal use.
  	 */
  	psmouse->model = ((priv->model_id & 0x00ff0000) >> 8) |
  			  (priv->model_id & 0x000000ff);
  
  	if (absolute_mode) {
  		psmouse->protocol_handler = synaptics_process_byte;
  		psmouse->pktsize = 6;
  	} else {
  		/* Relative mode follows standard PS/2 mouse protocol */
  		psmouse->protocol_handler = psmouse_process_byte;
  		psmouse->pktsize = 3;
  	}
  
  	psmouse->set_rate = synaptics_set_rate;
  	psmouse->disconnect = synaptics_disconnect;
  	psmouse->reconnect = synaptics_reconnect;
  	psmouse->cleanup = synaptics_reset;
  	/* Synaptics can usually stay in sync without extra help */
  	psmouse->resync_time = 0;
  
  	if (SYN_CAP_PASS_THROUGH(priv->capabilities))
  		synaptics_pt_create(psmouse);
  
  	/*
  	 * Toshiba's KBC seems to have trouble handling data from
  	 * Synaptics at full rate.  Switch to a lower rate (roughly
  	 * the same rate as a standard PS/2 mouse).
  	 */
  	if (psmouse->rate >= 80 && impaired_toshiba_kbc) {
  		psmouse_info(psmouse,
  			     "Toshiba %s detected, limiting rate to 40pps.\n",
  			     dmi_get_system_info(DMI_PRODUCT_NAME));
  		psmouse->rate = 40;
  	}
  
  	if (!priv->absolute_mode && SYN_ID_DISGEST_SUPPORTED(priv->identity)) {
  		err = device_create_file(&psmouse->ps2dev.serio->dev,
  					 &psmouse_attr_disable_gesture.dattr);
  		if (err) {
  			psmouse_err(psmouse,
  				    "Failed to create disable_gesture attribute (%d)",
  				    err);
  			goto init_fail;
  		}
  	}
  
  	return 0;
  
   init_fail:
  	kfree(priv);
  	return err;
  }
  
  int synaptics_init(struct psmouse *psmouse)
  {
  	return __synaptics_init(psmouse, true);
  }
  
  int synaptics_init_relative(struct psmouse *psmouse)
  {
  	return __synaptics_init(psmouse, false);
  }
  
  bool synaptics_supported(void)
  {
  	return true;
  }
  
  #else /* CONFIG_MOUSE_PS2_SYNAPTICS */
  
  void __init synaptics_module_init(void)
  {
  }
  
  int synaptics_init(struct psmouse *psmouse)
  {
  	return -ENOSYS;
  }
  
  bool synaptics_supported(void)
  {
  	return false;
  }
  
  #endif /* CONFIG_MOUSE_PS2_SYNAPTICS */
  