[PATCH v2 2/3] input: Cypress PS/2 Trackpad psmouse driver

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From: Cypress Semiconductor Corporation <customercare@xxxxxxxxxxx>

Input/mouse driver for Cypress PS/2 Trackpad.

Original code contributed by Cypress Semiconductor Corporation,
modified by Kamal Mostafa and Kyle Fazzari.

BugLink: http://launchpad.net/bugs/978807

Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
Signed-off-by: Kyle Fazzari <git@xxxxxxxxxxxxxxxxx>
Signed-off-by: Mario Limonciello <mario_limonciello@xxxxxxxx>
Signed-off-by: Tim Gardner <tim.gardner@xxxxxxxxxxxxx>
Acked-by: Herton Krzesinski <herton.krzesinski@xxxxxxxxxxxxx>
---
 drivers/input/mouse/cypress_ps2.c |  956 +++++++++++++++++++++++++++++++++++++
 drivers/input/mouse/cypress_ps2.h |  220 +++++++++
 2 files changed, 1176 insertions(+)
 create mode 100644 drivers/input/mouse/cypress_ps2.c
 create mode 100644 drivers/input/mouse/cypress_ps2.h

diff --git a/drivers/input/mouse/cypress_ps2.c b/drivers/input/mouse/cypress_ps2.c
new file mode 100644
index 0000000..5762be6
--- /dev/null
+++ b/drivers/input/mouse/cypress_ps2.c
@@ -0,0 +1,956 @@
+/*
+ * Cypress Trackpad PS/2 mouse driver
+ *
+ * Copyright (c) 2012 Cypress Semiconductor Corporation.
+ *
+ * Additional contributors include:
+ *   Kamal Mostafa <kamal@xxxxxxxxxxxxx>
+ *   Kyle Fazzari <git@xxxxxxxxxxxxxxxxx>
+ *
+ * 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/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/serio.h>
+#include <linux/libps2.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+
+#include "cypress_ps2.h"
+
+#define CYTP_DBG_DUMP 0		/* set to 1 for more verbose debug dump */
+
+#define cytp_dbg(fmt, ...)  \
+	do {  \
+		if (cytp)  \
+			psmouse_dbg(psmouse, pr_fmt(fmt), ##__VA_ARGS__);  \
+	} while (0)
+
+#if CYTP_DBG_DUMP
+# define cytp_dbg_dump(fmt, ...)	 \
+	do {  \
+		if (cytp)  \
+			psmouse_dbg(psmouse, pr_fmt(fmt), ##__VA_ARGS__);  \
+	} while (0)
+#else
+# define cytp_dbg_dump(fmt, ...)
+#endif
+
+static int read_timeout = 200;
+module_param_named(cy_read_timeout, read_timeout, int, 0644);
+MODULE_PARM_DESC(cy_read_timeout, "Set CyPS/2 cmd read timeout (default 200 msec)");
+
+
+/* p is a pointer points to the buffer containing Cypress Keys. */
+#define IS_CYPRESS_KEY(p) ((p[0] == CYPRESS_KEY_1) && (p[1] == CYPRESS_KEY_2))
+#define CYTP_SET_PACKET_SIZE(n) { psmouse->pktsize = cytp->pkt_size = (n); }
+#define CYTP_SET_MODE_BIT(x)  \
+	do {  \
+		if ((x) & CYTP_BIT_ABS_REL_MASK)  \
+			cytp->mode = (cytp->mode & ~CYTP_BIT_ABS_REL_MASK) | (x);  \
+		else  \
+			cytp->mode |= (x);  \
+	} while (0)
+#define CYTP_CLEAR_MODE_BIT(x)	{ cytp->mode &= ~(x); }
+
+#define CYTP_SUPPORT_ABS
+
+static unsigned char cytp_rate[] = {10, 20, 40, 60, 100, 200};
+static unsigned char cytp_resolution[] = {0x00, 0x01, 0x02, 0x03};
+
+static int cypress_ps2_sendbyte(struct psmouse *psmouse, int value)
+{
+	struct cytp_data *cytp = psmouse->private;
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+
+	if (ps2_sendbyte(ps2dev, value & 0xff, CYTP_CMD_TIMEOUT) < 0) {
+		cytp_dbg("send command 0x%02x failed, resp 0x%02x\n",
+			 value & 0xff, ps2dev->nak);
+		if (ps2dev->nak == CYTP_PS2_RETRY)
+			return CYTP_PS2_RETRY;
+		else
+			return CYTP_PS2_ERROR;
+	}
+
+	cytp_dbg("send command 0x%02x success, resp 0xfa\n", value & 0xff);
+
+	return 0;
+}
+
+static int cypress_ps2_ext_cmd(struct psmouse *psmouse, unsigned short cmd,
+			       unsigned char data)
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+	int tries = CYTP_PS2_CMD_TRIES;
+	int rc;
+
+	ps2_begin_command(ps2dev);
+
+	do {
+		/*
+		 * send extension command 0xE8 or 0xF3,
+		 * if send extension command failed,
+		 * try to send recovery command to make
+		 * trackpad device return to ready wait command state.
+		 * It alwasy success based on this recovery commands.
+		 */
+		rc = cypress_ps2_sendbyte(psmouse, cmd & 0xff);
+		if (rc == CYTP_PS2_RETRY) {
+			rc = cypress_ps2_sendbyte(psmouse, 0x00);
+			if (rc == CYTP_PS2_RETRY)
+				rc = cypress_ps2_sendbyte(psmouse, 0x0a);
+		}
+		if (rc == CYTP_PS2_ERROR)
+			continue;
+
+		rc = cypress_ps2_sendbyte(psmouse, data);
+		if (rc == CYTP_PS2_RETRY)
+			rc = cypress_ps2_sendbyte(psmouse, data);
+		if (rc == CYTP_PS2_ERROR)
+			continue;
+		else
+			break;
+	} while (--tries > 0);
+
+	ps2_end_command(ps2dev);
+
+	return rc;
+}
+
+static int cypress_ps2_read_cmd_status(struct psmouse *psmouse,
+				       unsigned char cmd,
+				       unsigned char *param)
+{
+	int i;
+	int rc;
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+	struct cytp_data *cytp = psmouse->private;
+	enum psmouse_state old_state;
+	unsigned char old_pktsize;
+
+	ps2_begin_command(&psmouse->ps2dev);
+
+	old_state = psmouse->state;
+	psmouse->state = PSMOUSE_CMD_MODE;
+	psmouse->pktcnt = 0;
+	old_pktsize = psmouse->pktsize;
+	psmouse->pktsize = 3;
+	if (cmd == CYTP_CMD_READ_VITAL_STATISTICS)
+		psmouse->pktsize = 8;
+	memset(param, 0, psmouse->pktsize);
+
+	rc = cypress_ps2_sendbyte(psmouse, 0xe9);
+	if (rc < 0)
+		goto out;
+
+	wait_event_timeout(ps2dev->wait,
+			   (psmouse->pktcnt >= psmouse->pktsize), msecs_to_jiffies(read_timeout));
+
+	memcpy(param, psmouse->packet, psmouse->pktsize);
+
+	cytp_dbg("Command 0x%02x response data: (0x)", cmd);
+	for (i = 0; i < psmouse->pktsize; i++)
+		cytp_dbg(" %02x", param[i]);
+	cytp_dbg("\n");
+
+out:
+	psmouse->state = old_state;
+	psmouse->pktcnt = 0;
+	psmouse->pktsize = old_pktsize;
+
+	ps2_end_command(&psmouse->ps2dev);
+
+	return rc;
+}
+
+static int cypress_verify_cmd_state(struct psmouse *psmouse,
+				    unsigned char cmd, unsigned char *param)
+{
+	struct cytp_data *cytp = psmouse->private;
+	bool rate_match = 0;
+	bool resolution_match = 0;
+	int i;
+
+	/* callers will do further checking. */
+	if ((cmd == CYTP_CMD_READ_CYPRESS_ID) ||
+	    (cmd == CYTP_CMD_STANDARD_MODE) ||
+	    (cmd == CYTP_CMD_READ_VITAL_STATISTICS))
+		return 0;
+	if (((~param[0] & DFLT_RESP_BITS_VALID) == DFLT_RESP_BITS_VALID) &&
+	    ((param[0] & DFLT_RESP_BIT_MODE) == DFLT_RESP_STREAM_MODE)) {
+		for (i = 0; i < sizeof(cytp_resolution); i++)
+			if (cytp_resolution[i] == param[1])
+				resolution_match =  1;
+
+		for (i = 0; i < sizeof(cytp_rate); i++)
+			if (cytp_rate[i] == param[2])
+				rate_match = 1;
+
+		if (resolution_match && rate_match)
+			return 0;
+	}
+
+	cytp_dbg("verify cmd state failed.\n");
+	return -1;
+}
+
+static int cypress_send_ext_cmd(struct psmouse *psmouse, unsigned char cmd,
+				unsigned char *param)
+{
+	struct cytp_data *cytp = psmouse->private;
+	int tries = CYTP_PS2_CMD_TRIES;
+	int rc;
+
+	cytp_dbg("send extension cmd 0x%02x, [%d %d %d %d]\n",
+		 cmd, DECODE_CMD_AA(cmd), DECODE_CMD_BB(cmd),
+		 DECODE_CMD_CC(cmd), DECODE_CMD_DD(cmd));
+	do {
+		cypress_ps2_ext_cmd(psmouse,
+				    PSMOUSE_CMD_SETRES, DECODE_CMD_DD(cmd));
+		cypress_ps2_ext_cmd(psmouse,
+				    PSMOUSE_CMD_SETRES, DECODE_CMD_CC(cmd));
+		cypress_ps2_ext_cmd(psmouse,
+				    PSMOUSE_CMD_SETRES, DECODE_CMD_BB(cmd));
+		cypress_ps2_ext_cmd(psmouse,
+				    PSMOUSE_CMD_SETRES, DECODE_CMD_AA(cmd));
+
+		rc = cypress_ps2_read_cmd_status(psmouse, cmd, param);
+		if ((rc == 0) &&
+		    (cypress_verify_cmd_state(psmouse, cmd, param) == 0))
+			break;
+	} while (--tries > 0);
+
+
+	if (tries <= 0)
+		return -1;
+
+	return 0;
+
+}
+
+int cypress_detect(struct psmouse *psmouse, bool set_properties)
+{
+	unsigned char param[3];
+
+	if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_CYPRESS_ID, param))
+		return -1;
+
+	if (!IS_CYPRESS_KEY(param))
+		return -ENODEV;
+
+	if (set_properties) {
+		psmouse->vendor = "Cypress";
+		psmouse->name = "Trackpad";
+	}
+
+	return 0;
+}
+
+static int cypress_read_fw_version(struct psmouse *psmouse)
+{
+	struct cytp_data *cytp = psmouse->private;
+	unsigned char param[3];
+
+	if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_CYPRESS_ID, param))
+		return -1;
+
+	if (!IS_CYPRESS_KEY(param))
+		return -ENODEV;
+
+	cytp->fw_version = param[2] & FW_VERSION_MASX;
+	cytp->vital_statics_supported = (param[2] & VITAL_STATICS_MASK) ? 1 : 0;
+
+	cytp_dbg("cytp->fw_version = %d\n", cytp->fw_version);
+	cytp_dbg("cytp->vital_statics_supported = %d\n",
+		 cytp->vital_statics_supported);
+	return 0;
+}
+
+static int cypress_read_vital_statistics(struct psmouse *psmouse)
+{
+	struct cytp_data *cytp = psmouse->private;
+	unsigned char param[8];
+
+	/* set default values for vital statistics not supported trackpad. */
+	cytp->tp_width = CYTP_DEFAULT_WIDTH;
+	cytp->tp_high = CYTP_DEFAULT_HIGH;
+	cytp->tp_max_abs_x = CYTP_ABS_MAX_X;
+	cytp->tp_max_abs_y = CYTP_ABS_MAX_Y;
+	cytp->tp_min_pressure = CYTP_MIN_PRESSURE;
+	cytp->tp_max_pressure = CYTP_MAX_PRESSURE;
+	cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width;
+	cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high;
+
+	memset(param, 0, sizeof(param));
+	if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_VITAL_STATISTICS, param) == 0) {
+		/* Update trackpad parameters. */
+		cytp->tp_max_abs_x = (param[1] << 8) | param[0];
+		cytp->tp_max_abs_y = (param[3] << 8) | param[2];
+		cytp->tp_min_pressure = param[4];
+		cytp->tp_max_pressure = param[5];
+
+		if (param[6] & VITAL_BIT_APA)
+			cytp->tp_type = CYTP_APA;
+		else if (param[6] & VITAL_BIT_MTG)
+			cytp->tp_type = CYTP_MTG;
+		else
+			cytp->tp_type = CYTP_STG;
+		cytp->tp_palm = (param[6] & VITAL_BIT_PALM) ? 1 : 0;
+		cytp->tp_stubborn = (param[6] & VITAL_BIT_STUBBORN) ? 1 : 0;
+		cytp->tp_2f_jitter = (param[6] & VITAL_BIT_2F_JITTER) >> 4;
+		cytp->tp_1f_jitter = (param[6] & VITAL_BIT_1F_JITTER) >> 2;
+		cytp->tp_abs_packet_format_set =
+			(param[7] & VITAL_BIT_ABS_PKT_FORMAT_SET) >> 4;
+		cytp->tp_2f_spike = (param[7] & VITAL_BIT_2F_SPIKE) >> 2;
+		cytp->tp_1f_spike = (param[7] & VITAL_BIT_1F_SPIKE);
+
+	}
+
+	if (!cytp->tp_max_pressure ||
+	    (cytp->tp_max_pressure < cytp->tp_min_pressure) ||
+	    (!cytp->tp_width || !cytp->tp_high) ||
+	    (!cytp->tp_max_abs_x) ||
+	    (cytp->tp_max_abs_x < cytp->tp_width) ||
+	    (!cytp->tp_max_abs_y) ||
+	    (cytp->tp_max_abs_y < cytp->tp_high))
+		return -1;
+
+	cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width;
+	cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high;
+
+	cytp_dbg_dump("Dump trackpad hardware configuration as below:\n");
+	cytp_dbg_dump("cytp->tp_width = %d\n", cytp->tp_width);
+	cytp_dbg_dump("cytp->tp_high = %d\n", cytp->tp_high);
+	cytp_dbg_dump("cytp->tp_max_abs_x = %d\n", cytp->tp_max_abs_x);
+	cytp_dbg_dump("cytp->tp_max_abs_y = %d\n", cytp->tp_max_abs_y);
+	cytp_dbg_dump("cytp->tp_min_pressure = %d\n", cytp->tp_min_pressure);
+	cytp_dbg_dump("cytp->tp_max_pressure = %d\n", cytp->tp_max_pressure);
+	cytp_dbg_dump("cytp->tp_res_x = %d\n", cytp->tp_res_x);
+	cytp_dbg_dump("cytp->tp_res_y = %d\n", cytp->tp_res_y);
+	cytp_dbg_dump("cytp->tp_type = %d\n", cytp->tp_type);
+	cytp_dbg_dump("cytp->tp_palm = %d\n", cytp->tp_palm);
+	cytp_dbg_dump("cytp->tp_stubborn = %d\n", cytp->tp_stubborn);
+	cytp_dbg_dump("cytp->tp_1f_jitter = %d\n", cytp->tp_1f_jitter);
+	cytp_dbg_dump("cytp->tp_2f_jitter = %d\n", cytp->tp_2f_jitter);
+	cytp_dbg_dump("cytp->tp_1f_spike = %d\n", cytp->tp_1f_spike);
+	cytp_dbg_dump("cytp->tp_2f_spike = %d\n", cytp->tp_2f_spike);
+	cytp_dbg_dump("cytp->tp_abs_packet_format_set = %d\n",
+		      cytp->tp_abs_packet_format_set);
+
+	return 0;
+}
+
+static int cypress_query_hardware(struct psmouse *psmouse)
+{
+	struct cytp_data *cytp = psmouse->private;
+
+	if (cypress_read_fw_version(psmouse))
+		return -1;
+
+	if (cytp->vital_statics_supported) {
+		if (cypress_read_vital_statistics(psmouse))
+			return -1;
+	}
+
+	return 0;
+}
+
+static int cypress_set_absolute_mode(struct psmouse *psmouse)
+{
+	struct cytp_data *cytp = psmouse->private;
+	unsigned char param[3];
+
+	if (cypress_send_ext_cmd(psmouse, CYTP_CMD_ABS_WITH_PRESSURE_MODE, param) < 0)
+		return -1;
+
+	CYTP_SET_MODE_BIT(CYTP_BIT_ABS_PRESSURE);
+	CYTP_SET_PACKET_SIZE(5);
+
+	return 0;
+}
+
+/*
+ * reset trackpad device to standard relative mode.
+ * This is also the defalut mode when trackpad powered on.
+ */
+static void cypress_reset(struct psmouse *psmouse)
+{
+	struct cytp_data *cytp = psmouse->private;
+
+	psmouse_reset(psmouse);
+
+	CYTP_SET_MODE_BIT(CYTP_BIT_STANDARD_REL);
+	CYTP_SET_PACKET_SIZE(3);
+
+	cytp->prev_contact_cnt = 0;
+}
+
+static int cypress_set_input_params(struct input_dev *input,
+				    struct cytp_data *cytp)
+{
+	int ret;
+
+	if (cytp->mode & CYTP_BIT_ABS_MASK) {
+		__set_bit(EV_ABS, input->evbit);
+		input_set_abs_params(input, ABS_X, 0, cytp->tp_max_abs_x, 0, 0);
+		input_set_abs_params(input, ABS_Y, 0, cytp->tp_max_abs_y, 0, 0);
+		input_set_abs_params(input, ABS_PRESSURE,
+				     cytp->tp_min_pressure, cytp->tp_max_pressure, 0, 0);
+		input_set_abs_params(input, ABS_TOOL_WIDTH, 0, 255, 0, 0);
+
+		/* finger position */
+		input_set_abs_params(input, ABS_MT_POSITION_X, 0, cytp->tp_max_abs_x, 0, 0);
+		input_set_abs_params(input, ABS_MT_POSITION_Y, 0, cytp->tp_max_abs_y, 0, 0);
+		input_set_abs_params(input, ABS_MT_PRESSURE, 0, 255, 0, 0);
+
+		ret = input_mt_init_slots(input, CYTP_MAX_MT_SLOTS, 0);
+		if (ret < 0) {
+			return ret;
+		}
+
+		if (cytp->tp_res_x && cytp->tp_res_x) {
+			input_abs_set_res(input, ABS_X, cytp->tp_res_x);
+			input_abs_set_res(input, ABS_Y, cytp->tp_res_y);
+
+			input_abs_set_res(input, ABS_MT_POSITION_X,
+					  cytp->tp_res_x);
+			input_abs_set_res(input, ABS_MT_POSITION_Y,
+					  cytp->tp_res_y);
+
+		}
+
+		__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
+		__set_bit(EV_KEY, input->evbit);
+		__set_bit(BTN_TOUCH, input->keybit);
+		__set_bit(BTN_TOOL_FINGER, input->keybit);
+		__set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
+		__set_bit(BTN_TOOL_TRIPLETAP, input->keybit);
+		__set_bit(BTN_TOOL_QUADTAP, input->keybit);
+		__set_bit(BTN_TOOL_QUINTTAP, input->keybit);
+
+		__set_bit(BTN_LEFT, input->keybit);
+		__set_bit(BTN_RIGHT, input->keybit);
+		__set_bit(BTN_MIDDLE, input->keybit);
+
+		__clear_bit(EV_REL, input->evbit);
+		__clear_bit(REL_X, input->relbit);
+		__clear_bit(REL_Y, input->relbit);
+	} else {
+		__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
+		__set_bit(EV_REL, input->evbit);
+		__set_bit(REL_X, input->relbit);
+		__set_bit(REL_Y, input->relbit);
+		__set_bit(REL_WHEEL, input->relbit);
+		__set_bit(REL_HWHEEL, input->relbit);
+
+		__set_bit(EV_KEY, input->evbit);
+		__set_bit(BTN_LEFT, input->keybit);
+		__set_bit(BTN_RIGHT, input->keybit);
+		__set_bit(BTN_MIDDLE, input->keybit);
+
+		__clear_bit(EV_ABS, input->evbit);
+	}
+
+	input_set_drvdata(input, cytp);
+
+	return 0;
+}
+
+static int cypress_get_finger_count(unsigned char header_byte)
+{
+	unsigned char bits6_7;
+	int finger_count;
+
+	bits6_7 = header_byte >> 6;
+	finger_count = bits6_7 & 0x03;
+
+	if (finger_count != 1) {
+		if (header_byte & ABS_HSCROLL_BIT) {
+			if (finger_count == 0) {
+				/* HSCROLL gets added on to 0 finger count. */
+				finger_count = 4;
+				/* should remove HSCROLL bit. */
+			} else {
+				if (finger_count == 2) {
+					finger_count = 5;
+				} else {
+					/* Invalid contact (e.g. palm). Ignore it. */
+					finger_count = 0;
+				}
+			}
+		}
+	}
+
+	return finger_count;
+}
+
+static int new_slot_id(void)
+{
+	static int id = -1;
+
+	id++;
+	if (id >= CYTP_MAX_MT_SLOTS)
+		id = 0;
+
+	return id;
+}
+
+#define FINGER_MAX_JITTER_DISTANCE 25
+static inline bool same_finger(struct cytp_contact *prev_contact,
+			       struct cytp_contact *contact)
+{
+	if (abs(prev_contact->x - contact->x) < FINGER_MAX_JITTER_DISTANCE) {
+		if (abs(prev_contact->y - contact->y) < FINGER_MAX_JITTER_DISTANCE) {
+			return true;
+		}
+	}
+
+	return false;
+}
+
+#define ID_NULL	  ((unsigned char)0x00)
+#define ID_NEW	  ((unsigned char)0x01)
+#define ID_KEEP	  ((unsigned char)0x02)
+#define ID_UPDATE ((unsigned char)0x03)
+static const unsigned char
+new_slot_id_flags[CYTP_MAX_CONTACTS+1][CYTP_MAX_CONTACTS+1] = {
+	/* previous contact_cnt = 0. */
+	{ ID_NULL, ID_NEW, ID_NEW, ID_NEW, ID_NEW, ID_NEW },
+
+	/* previous contact_cnt = 1. */
+	{ ID_NULL, ID_KEEP, ID_UPDATE, ID_NEW, ID_NEW, ID_NEW },
+
+	/* previous contact_cnt = 2. */
+	{ ID_NULL, ID_UPDATE, ID_KEEP, ID_NEW, ID_NEW, ID_NEW },
+
+	/* previous contact_cnt = 3. */
+	{ ID_NULL, ID_NEW, ID_NEW, ID_KEEP, ID_NEW, ID_NEW },
+
+	/* previous contact_cnt = 4. */
+	{ ID_NULL, ID_NEW, ID_NEW, ID_NEW, ID_KEEP, ID_NEW },
+
+	/* previous contact_cnt = 5. */
+	{ ID_NULL, ID_NEW, ID_NEW, ID_NEW, ID_NEW, ID_KEEP },
+};
+
+static int cypress_cal_finger_id(struct cytp_data *cytp,
+				 struct cytp_report_data *new_report)
+{
+	int i, j;
+	bool slot_id_updated;
+	struct cytp_report_data *prev_report = &cytp->prev_report_data;
+	unsigned char flag =
+		new_slot_id_flags[prev_report->contact_cnt][new_report->contact_cnt];
+
+	if (flag == ID_NEW) {
+		for (i = 0; i < new_report->contact_cnt; i++) {
+			new_report->contacts[i].id = new_slot_id();
+		}
+
+	} else if (flag == ID_KEEP) {
+		/* firmware will ensure that the finger id is report in same order. */
+		for (i = 0; i < new_report->contact_cnt; i++) {
+			new_report->contacts[i].id = prev_report->contacts[i].id;
+		}
+
+	} else if (flag == ID_UPDATE) {
+		for (i = 0; i < new_report->contact_cnt; i++) {
+			slot_id_updated = false;
+			for (j = 0; j < prev_report->contact_cnt; j++) {
+				if (same_finger(&new_report->contacts[i],
+						&prev_report->contacts[j])) {
+					new_report->contacts[i].id = prev_report->contacts[j].id;
+					slot_id_updated = true;
+					break;
+				}
+			}
+
+			if (!slot_id_updated)
+				new_report->contacts[i].id = new_slot_id();
+		}
+	}
+
+	if (new_report->contact_cnt == 0)
+		cytp->zero_packet_cnt++;
+	else
+		cytp->zero_packet_cnt = 0;
+	cytp->prev_report_data = *new_report;
+
+	return 0;
+}
+
+static int position_adjust_array[4] = {
+	50, -50, 100, -100
+};
+static void cypress_simulate_fingers(struct cytp_data *cytp,
+				     struct cytp_report_data *report_data)
+{
+	int i;
+
+	if (report_data->contact_cnt >= 3) {
+		for (i = 1; i < report_data->contact_cnt; i++) {
+			report_data->contacts[i].x =
+				report_data->contacts[0].x + position_adjust_array[i - 1];
+			report_data->contacts[i].y = report_data->contacts[0].y;
+			report_data->contacts[i].z = report_data->contacts[0].z;
+
+			if (report_data->contacts[i].x < 0)
+				report_data->contacts[i].x = 0;
+			if (report_data->contacts[i].x > cytp->tp_max_abs_x)
+				report_data->contacts[i].x = cytp->tp_max_abs_x;
+		}
+	}
+}
+
+static int cypress_parse_packet(struct psmouse *psmouse,
+				struct cytp_data *cytp, struct cytp_report_data *report_data)
+{
+	int i;
+	unsigned char *packet = psmouse->packet;
+	unsigned char header_byte = packet[0];
+
+	memset(report_data, 0, sizeof(struct cytp_report_data));
+	if (cytp->mode & CYTP_BIT_ABS_MASK) {
+		report_data->contact_cnt = cypress_get_finger_count(header_byte);
+
+		if (report_data->contact_cnt > CYTP_MAX_CONTACTS) {
+			/* report invalid data as zero package except the button data. */
+			report_data->contact_cnt = 0;
+			cytp_dbg("cypress_parse_packet: received invalid packet.\n");
+		}
+
+		report_data->tap = (header_byte & ABS_MULTIFINGER_TAP) ? 1 : 0;
+
+		/* Remove HSCROLL bit */
+		if (report_data->contact_cnt == 4)
+			header_byte &= ~(ABS_HSCROLL_BIT);
+
+		if (report_data->contact_cnt == 1) {
+			report_data->contacts[0].x =
+				((packet[1] & 0x70) << 4) | packet[2];
+			report_data->contacts[0].y =
+				((packet[1] & 0x07) << 8) | packet[3];
+			if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
+				report_data->contacts[0].z = packet[4];
+
+			if ((packet[1] & ABS_EDGE_MOTION_MASK) != ABS_EDGE_MOTION_MASK) {
+				report_data->vscroll = (header_byte & ABS_VSCROLL_BIT) ? 1 : 0;
+				report_data->hscroll = (header_byte & ABS_HSCROLL_BIT) ? 1 : 0;
+			}
+
+		} else if (report_data->contact_cnt == 2) {
+			report_data->contacts[0].x =
+				((packet[1] & 0x70) << 4) | packet[2];
+			report_data->contacts[0].y =
+				((packet[1] & 0x07) << 8) | packet[3];
+			if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
+				report_data->contacts[0].z = packet[4];
+
+			report_data->contacts[1].x =
+				((packet[5] & 0xf0) << 4) | packet[6];
+			report_data->contacts[1].y =
+				((packet[5] & 0x0f) << 8) | packet[7];
+			if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
+				report_data->contacts[1].z = report_data->contacts[0].z;
+
+		} else if (report_data->contact_cnt >= 3) {
+			report_data->contacts[0].x =
+				((packet[1] & 0xf0) << 4) | packet[2];
+			report_data->contacts[0].y =
+				((packet[1] & 0x0f) << 8) | packet[3];
+			if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
+				report_data->contacts[0].z = packet[4];
+
+			cypress_simulate_fingers(cytp, report_data);
+
+			report_data->vscroll = (header_byte & ABS_VSCROLL_BIT) ? 1 : 0;
+		}
+
+		cypress_cal_finger_id(cytp, report_data);
+
+		report_data->left = (header_byte & BTN_LEFT_BIT) ? 1 : 0;
+		report_data->right = (header_byte & BTN_RIGHT_BIT) ? 1 : 0;
+
+	} else {
+		report_data->contact_cnt = 1;
+		report_data->contacts[0].x =
+			(packet[0] & REL_X_SIGN_BIT) ? -packet[1] : packet[1];
+		report_data->contacts[0].y =
+			(packet[0] & REL_Y_SIGN_BIT) ? -packet[2] : packet[2];
+		report_data->vscroll = packet[3];
+		report_data->left = (packet[0] & BTN_LEFT_BIT) ? 1 : 0;
+		report_data->right = (packet[0] & BTN_RIGHT_BIT) ? 1 : 0;
+
+		if (cytp->mode & CYTP_BIT_STANDARD_REL)
+			report_data->middle =
+				(packet[0] & BTN_MIDDLE_BIT) ? 1 : 0;
+		if (cytp->mode & CYTP_BIT_CYPRESS_REL) {
+			report_data->left =
+				(packet[0] & BTN_MIDDLE_BIT) ? 1 : 0;
+			report_data->hscroll = packet[4];
+		}
+	}
+
+	/* This is only true if one of the mouse buttons were tapped.
+	 * Make sure it doesn't turn into a click. The regular tap-to-
+	 * click functionality will handle that on its own. If we don't
+	 * do this, disabling tap-to-click won't affect the mouse button
+	 * zones. */
+	if (report_data->tap)
+		report_data->left = 0;
+
+	if (report_data->contact_cnt <= 0)
+		return 0;
+
+	cytp_dbg_dump("cypress_parse_packet cytp->zero_packet_cnt = %d\n", cytp->zero_packet_cnt);
+	cytp_dbg_dump("Dump parsed report data as below:\n");
+	cytp_dbg_dump("contact_cnt = %d\n", report_data->contact_cnt);
+	for (i = 0; i < report_data->contact_cnt; i++) {
+		cytp_dbg_dump("contacts[%d].x = %d\n", i, report_data->contacts[i].x);
+		cytp_dbg_dump("contacts[%d].y = %d\n", i, report_data->contacts[i].y);
+		cytp_dbg_dump("contacts[%d].z = %d\n", i, report_data->contacts[i].z);
+		cytp_dbg_dump("contacts[%d].id = %d\n", i, report_data->contacts[i].id);
+	}
+	cytp_dbg_dump("vscroll = %d\n", report_data->vscroll);
+	cytp_dbg_dump("hscroll = %d\n", report_data->hscroll);
+	cytp_dbg_dump("left = %d\n", report_data->left);
+	cytp_dbg_dump("right = %d\n", report_data->right);
+	cytp_dbg_dump("middle = %d\n", report_data->middle);
+
+	return 0;
+}
+
+static void cypress_process_packet(struct psmouse *psmouse, bool zero_pkt)
+{
+	int i;
+	struct input_dev *input = psmouse->dev;
+	struct cytp_data *cytp = psmouse->private;
+	struct cytp_report_data report_data;
+	unsigned int mask;
+	struct cytp_contact *contact;
+	int slot;
+
+	if (cypress_parse_packet(psmouse, cytp, &report_data))
+		return;
+
+	if (cytp->mode & CYTP_BIT_ABS_MASK) {
+		mask = 0;
+		for (i = 0; i < report_data.contact_cnt; i++) {
+			contact = &report_data.contacts[i];
+			slot = contact->id;
+
+			mask |= (1 << slot);
+			input_mt_slot(input, slot);
+			input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
+			input_report_abs(input, ABS_MT_POSITION_X, contact->x);
+			input_report_abs(input, ABS_MT_POSITION_Y, contact->y);
+			input_report_abs(input, ABS_MT_PRESSURE, contact->z);
+		}
+
+		/* Invalidate all unreported slots */
+		for (i = 0; i < CYTP_MAX_MT_SLOTS; i++) {
+			if (mask & (1 << i))
+				continue;
+
+			input_mt_slot(input, i);
+			input_mt_report_slot_state(input, MT_TOOL_FINGER, false);
+		}
+
+		input_mt_report_pointer_emulation(input, true);
+
+		input_report_key(input, BTN_LEFT, report_data.left);
+		input_report_key(input, BTN_RIGHT, report_data.right);
+		input_report_key(input, BTN_MIDDLE, report_data.middle);
+
+		input_sync(input);
+
+	} else {
+		if (report_data.contact_cnt == 1) {
+			input_report_rel(input, REL_X, report_data.contacts[0].x);
+			input_report_rel(input, REL_Y, report_data.contacts[0].y);
+		}
+
+		input_report_rel(input, REL_WHEEL, report_data.vscroll);
+		if (cytp->mode & CYTP_BIT_CYPRESS_REL)
+			input_report_rel(input, REL_HWHEEL, report_data.hscroll);
+
+		input_report_key(input, BTN_LEFT, report_data.left);
+		input_report_key(input, BTN_RIGHT, report_data.right);
+		input_report_key(input, BTN_MIDDLE, report_data.middle);
+
+		input_sync(input);
+	}
+}
+
+static psmouse_ret_t cypress_validate_byte(struct psmouse *psmouse)
+{
+	int contact_cnt;
+	int index = psmouse->pktcnt - 1;
+	unsigned char *packet = psmouse->packet;
+	struct cytp_data *cytp = psmouse->private;
+
+	if (index < 0 || index > cytp->pkt_size)
+		return PSMOUSE_BAD_DATA;
+
+	if ((index == 0) && ((packet[0] & 0xfc) == 0)) {
+		/* call packet process for reporting finger leave. */
+		cypress_process_packet(psmouse, 1);
+		return PSMOUSE_FULL_PACKET;
+	}
+
+	if (cytp->mode & CYTP_BIT_ABS_MASK) {
+		if (index == 0) {
+			if ((packet[0] & 0x08) == 0x08)
+				return PSMOUSE_BAD_DATA;
+
+			contact_cnt = cypress_get_finger_count(packet[0]);
+
+			if (contact_cnt > 5)
+				return PSMOUSE_BAD_DATA;
+
+			if (cytp->mode & CYTP_BIT_ABS_NO_PRESSURE) {
+				CYTP_SET_PACKET_SIZE(4);
+				if (contact_cnt == 2)
+					CYTP_SET_PACKET_SIZE(7);
+			} else {
+				CYTP_SET_PACKET_SIZE(5);
+				if (contact_cnt == 2)
+					CYTP_SET_PACKET_SIZE(8);
+			}
+		}
+
+		return PSMOUSE_GOOD_DATA;
+	} else {
+		if (index == 0) {
+			if ((packet[0] & 0x08) != 0x08)
+				return PSMOUSE_BAD_DATA;
+
+			CYTP_SET_PACKET_SIZE(3);
+			if (cytp->mode & CYTP_BIT_CYPRESS_REL)
+				CYTP_SET_PACKET_SIZE(5);
+		}
+
+		return PSMOUSE_GOOD_DATA;
+	}
+}
+
+static psmouse_ret_t cypress_protocol_handler(struct psmouse *psmouse)
+{
+	struct cytp_data *cytp = psmouse->private;
+
+	if (psmouse->pktcnt >= cytp->pkt_size) {
+		cypress_process_packet(psmouse, 0);
+		return PSMOUSE_FULL_PACKET;
+	}
+
+	return cypress_validate_byte(psmouse);
+}
+
+static void cypress_set_rate(struct psmouse *psmouse, unsigned int rate)
+{
+	struct cytp_data *cytp = psmouse->private;
+
+	if (rate >= 80) {
+		psmouse->rate = 80;
+		CYTP_SET_MODE_BIT(CYTP_BIT_HIGH_RATE);
+	} else {
+		psmouse->rate = 40;
+		CYTP_CLEAR_MODE_BIT(CYTP_BIT_HIGH_RATE);
+	}
+
+	ps2_command(&psmouse->ps2dev, (unsigned char *)&psmouse->rate,
+		    PSMOUSE_CMD_SETRATE);
+}
+
+static void cypress_disconnect(struct psmouse *psmouse)
+{
+	cypress_reset(psmouse);
+	kfree(psmouse->private);
+	psmouse->private = NULL;
+}
+
+static int cypress_reconnect(struct psmouse *psmouse)
+{
+	int tries = CYTP_PS2_CMD_TRIES;
+	int rc;
+
+	do {
+		cypress_reset(psmouse);
+		rc = cypress_detect(psmouse, false);
+	} while (rc && (--tries > 0));
+
+	if (rc)
+		return -1;
+
+	if (cypress_query_hardware(psmouse)) {
+		psmouse_err(psmouse, "Reconnect: unable to query Trackpad hardware.\n");
+		return -1;
+	}
+
+	if (cypress_set_absolute_mode(psmouse)) {
+		psmouse_err(psmouse, "Reconnect: Unable to initialize Cypress absolute mode.\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+int cypress_init(struct psmouse *psmouse)
+{
+	struct cytp_data *cytp;
+
+	cytp = (struct cytp_data *)kzalloc(sizeof(struct cytp_data), GFP_KERNEL);
+	psmouse->private = (void *)cytp;
+	if (cytp == NULL)
+		return -ENOMEM;
+
+	cypress_reset(psmouse);
+
+	if (cypress_query_hardware(psmouse)) {
+		psmouse_err(psmouse, "Unable to query Trackpad hardware.\n");
+		goto err_exit;
+	}
+
+	if (cypress_set_absolute_mode(psmouse)) {
+		psmouse_err(psmouse, "Reconnect: Unable to initialize Cypress absolute mode.\n");
+		goto err_exit;
+	}
+
+	if (cypress_set_input_params(psmouse->dev, cytp) < 0)
+		return -1;
+
+	psmouse->model = 1;
+	psmouse->protocol_handler = cypress_protocol_handler;
+	psmouse->set_rate = cypress_set_rate;
+	psmouse->disconnect = cypress_disconnect;
+	psmouse->reconnect = cypress_reconnect;
+	psmouse->cleanup = cypress_reset;
+	psmouse->pktsize = 8;
+	psmouse->resync_time = 0;
+
+	return 0;
+
+err_exit:
+	/*
+	 * Reset Cypress Trackpad as a standard mouse. Then
+	 * let psmouse driver commmunicating with it as default PS2 mouse.
+	 */
+	cypress_reset(psmouse);
+
+	psmouse->private = NULL;
+	kfree(cytp);
+
+	return -1;
+}
+
+bool cypress_supported(void)
+{
+	return true;
+}
diff --git a/drivers/input/mouse/cypress_ps2.h b/drivers/input/mouse/cypress_ps2.h
new file mode 100644
index 0000000..dd38658
--- /dev/null
+++ b/drivers/input/mouse/cypress_ps2.h
@@ -0,0 +1,220 @@
+#ifndef _CYPRESS_PS2_H
+#define _CYPRESS_PS2_H
+
+#include "psmouse.h"
+
+#define CMD_BITS_MASK 0x03
+#define COMPOSIT(x, s) (((x) & CMD_BITS_MASK) << (s))
+
+#define ENCODE_CMD(aa, bb, cc, dd) \
+	(COMPOSIT((aa), 6) | COMPOSIT((bb), 4) | COMPOSIT((cc), 2) | COMPOSIT((dd), 0))
+#define CYTP_CMD_ABS_NO_PRESSURE_MODE       ENCODE_CMD(0, 1, 0, 0)
+#define CYTP_CMD_ABS_WITH_PRESSURE_MODE     ENCODE_CMD(0, 1, 0, 1)
+#define CYTP_CMD_SMBUS_MODE                 ENCODE_CMD(0, 1, 1, 0)
+#define CYTP_CMD_STANDARD_MODE              ENCODE_CMD(0, 2, 0, 0)  /* not implemented yet. */
+#define CYTP_CMD_CYPRESS_REL_MODE           ENCODE_CMD(1, 1, 1, 1)  /* not implemented yet. */
+#define CYTP_CMD_READ_CYPRESS_ID            ENCODE_CMD(0, 0, 0, 0)
+#define CYTP_CMD_READ_VITAL_STATISTICS      ENCODE_CMD(0, 0, 0, 1)
+#define CYTP_CMD_SET_HSCROLL_WIDTH(w)       ENCODE_CMD(1, 1, 0, (w))
+#define     CYTP_CMD_SET_HSCROLL_MASK       ENCODE_CMD(1, 1, 0, 0)
+#define CYTP_CMD_SET_VSCROLL_WIDTH(w)       ENCODE_CMD(1, 2, 0, (w))
+#define     CYTP_CMD_SET_VSCROLL_MASK       ENCODE_CMD(1, 2, 0, 0)
+#define CYTP_CMD_SET_PALM_GEOMETRY(e)       ENCODE_CMD(1, 2, 1, (e))
+#define     CYTP_CMD_PALM_GEMMETRY_MASK     ENCODE_CMD(1, 2, 1, 0)
+#define CYTP_CMD_SET_PALM_SENSITIVITY(s)    ENCODE_CMD(1, 2, 2, (s))
+#define     CYTP_CMD_PALM_SENSITIVITY_MASK  ENCODE_CMD(1, 2, 2, 0)
+#define CYTP_CMD_SET_MOUSE_SENSITIVITY(s)   ENCODE_CMD(1, 3, ((s) >> 2), (s))
+#define     CYTP_CMD_MOUSE_SENSITIVITY_MASK ENCODE_CMD(1, 3, 0, 0)
+#define CYTP_CMD_REQUEST_BASELINE_STATUS    ENCODE_CMD(2, 0, 0, 1)
+#define CYTP_CMD_REQUEST_RECALIBRATION      ENCODE_CMD(2, 0, 0, 3)
+
+#define DECODE_CMD_AA(x) (((x) >> 6) & CMD_BITS_MASK)
+#define DECODE_CMD_BB(x) (((x) >> 4) & CMD_BITS_MASK)
+#define DECODE_CMD_CC(x) (((x) >> 2) & CMD_BITS_MASK)
+#define DECODE_CMD_DD(x) ((x) & CMD_BITS_MASK)
+
+/* Cypress trackpad working mode. */
+#define CYTP_BIT_ABS_PRESSURE    (1 << 3)
+#define CYTP_BIT_ABS_NO_PRESSURE (1 << 2)
+#define CYTP_BIT_CYPRESS_REL     (1 << 1)
+#define CYTP_BIT_STANDARD_REL    (1 << 0)
+#define CYTP_BIT_REL_MASK (CYTP_BIT_CYPRESS_REL | CYTP_BIT_STANDARD_REL)
+#define CYTP_BIT_ABS_MASK (CYTP_BIT_ABS_PRESSURE | CYTP_BIT_ABS_NO_PRESSURE)
+#define CYTP_BIT_ABS_REL_MASK (CYTP_BIT_ABS_MASK | CYTP_BIT_REL_MASK)
+
+#define CYTP_BIT_HIGH_RATE       (1 << 4)
+/*
+ * report mode bit is set, firmware working in Remote Mode.
+ * report mode bit is cleared, firmware working in Stream Mode.
+ */
+#define CYTP_BIT_REPORT_MODE     (1 << 5)
+
+/* scrolling width values for set HSCROLL and VSCROLL width command. */
+#define SCROLL_WIDTH_NARROW 1
+#define SCROLL_WIDTH_NORMAL 2
+#define SCROLL_WIDTH_WIDE   3
+
+#define PALM_GEOMETRY_ENABLE  1
+#define PALM_GEOMETRY_DISABLE 0
+
+#define CYPRESS_KEY_1 0x33
+#define CYPRESS_KEY_2 0xCC
+
+#define VITAL_STATICS_MASK 0x80
+#define FW_VERSION_MASX    0x7f
+#define FW_VER_HIGH_MASK 0x70
+#define FW_VER_LOW_MASK  0x0f
+
+/* Times to retry a ps2_command and millisecond delay between tries. */
+#define CYTP_PS2_CMD_TRIES 3
+#define CYTP_PS2_CMD_DELAY 500
+
+/* time out for PS/2 command only in milliseconds. */
+#define CYTP_CMD_TIMEOUT  200
+#define CYTP_DATA_TIMEOUT 30
+
+#define CYTP_EXT_CMD   0xe8
+#define CYTP_PS2_RETRY 0xfe
+#define CYTP_PS2_ERROR 0xfc
+
+#define CYTP_RESP_RETRY 0x01
+#define CYTP_RESP_ERROR 0xfe
+
+
+#define CYTP_105001_WIDTH  97   /* Dell XPS 13 */
+#define CYTP_105001_HIGH   59
+#define CYTP_DEFAULT_WIDTH (CYTP_105001_WIDTH)
+#define CYTP_DEFAULT_HIGH  (CYTP_105001_HIGH)
+
+#define CYTP_ABS_MAX_X     1600
+#define CYTP_ABS_MAX_Y     900
+#define CYTP_MAX_PRESSURE  255
+#define CYTP_MIN_PRESSURE  0
+
+/* header byte bits of relative package. */
+#define BTN_LEFT_BIT   0x01
+#define BTN_RIGHT_BIT  0x02
+#define BTN_MIDDLE_BIT 0x04
+#define REL_X_SIGN_BIT 0x10
+#define REL_Y_SIGN_BIT 0x20
+
+/* header byte bits of absolute package. */
+#define ABS_VSCROLL_BIT 0x10
+#define ABS_HSCROLL_BIT 0x20
+#define ABS_MULTIFINGER_TAP 0x04
+#define ABS_EDGE_MOTION_MASK 0x80
+
+#define DFLT_RESP_BITS_VALID     0x88  /* SMBus bit should not be set. */
+#define DFLT_RESP_SMBUS_BIT      0x80
+#define   DFLT_SMBUS_MODE        0x80
+#define   DFLT_PS2_MODE          0x00
+#define DFLT_RESP_BIT_MODE       0x40
+#define   DFLT_RESP_REMOTE_MODE  0x40
+#define   DFLT_RESP_STREAM_MODE  0x00
+#define DFLT_RESP_BIT_REPORTING  0x20
+#define DFLT_RESP_BIT_SCALING    0x10
+
+#define VITAL_BIT_PALM               0x80
+#define VITAL_BIT_STUBBORN           0x40
+#define VITAL_BIT_2F_JITTER          0x30
+#define VITAL_BIT_1F_JITTER          0x0c
+#define VITAL_BIT_APA                0x02
+#define VITAL_BIT_MTG                0x01
+#define VITAL_BIT_ABS_PKT_FORMAT_SET 0xf0
+#define VITAL_BIT_2F_SPIKE           0x0c
+#define VITAL_BIT_1F_SPIKE           0x03
+
+/* bits of first byte response of E9h-Status Request command. */
+#define RESP_BTN_RIGHT_BIT  0x01
+#define RESP_BTN_MIDDLE_BIT 0x02
+#define RESP_BTN_LEFT_BIT   0x04
+#define RESP_SCALING_BIT    0x10
+#define RESP_ENABLE_BIT     0x20
+#define RESP_REMOTE_BIT     0x40
+#define RESP_SMBUS_BIT      0x80
+
+#define CYTP_MAX_CONTACTS 5
+#define CYTP_MAX_MT_SLOTS 16
+
+enum cytp_type {
+	CYTP_STG,
+	CYTP_MTG,
+	CYTP_APA,
+};
+
+struct cytp_contact {
+	int x;
+	int y;
+	int z;  /* also named as touch pressure. */
+	int id; /* It's incremented with every new touch. */
+};
+
+/* The structure of */
+struct cytp_report_data {
+	int contact_cnt;
+	struct cytp_contact contacts[CYTP_MAX_CONTACTS];
+	unsigned int left:1;
+	unsigned int right:1;
+	unsigned int middle:1;
+	unsigned int tap:1;  /* multi-finger tap detected. */
+	signed char vscroll;
+	signed char hscroll;
+};
+
+/* The structure of Cypress Trackpad device private data. */
+struct cytp_data {
+	int fw_version;
+
+	int pkt_size;
+	int mode;
+
+	int scaling;
+	int reporting;
+
+	int tp_min_pressure;
+	int tp_max_pressure;
+	int tp_width;  /* X direction physical size in mm. */
+	int tp_high;  /* Y direction physical size in mm. */
+	int tp_max_abs_x;  /* Max X absolution units can be reported. */
+	int tp_max_abs_y;  /* Max Y absolution units can be reported. */
+
+	int tp_res_x;  /* X resolution in units/mm. */
+	int tp_res_y;  /* Y resolution in units/mm. */
+
+	enum cytp_type tp_type;
+	unsigned char tp_palm;
+	unsigned char tp_stubborn;
+	unsigned char tp_2f_jitter;
+	unsigned char tp_1f_jitter;
+	unsigned char tp_abs_packet_format_set;
+	unsigned char tp_2f_spike;
+	unsigned char tp_1f_spike;
+
+	int vital_statics_supported;
+
+	int prev_contact_cnt;
+	int zero_packet_cnt;
+	struct cytp_report_data prev_report_data;
+};
+
+
+#ifdef CONFIG_MOUSE_PS2_CYPRESS
+int cypress_detect(struct psmouse *psmouse, bool set_properties);
+int cypress_init(struct psmouse *psmouse);
+bool cypress_supported(void);
+#else
+inline int cypress_detect(struct psmouse *psmouse, bool set_properties)
+{
+	return -ENOSYS;
+}
+inline int cypress_init(struct psmouse *psmouse)
+{
+	return -ENOSYS;
+}
+inline bool cypress_supported(void)
+{
+	return 0;
+}
+#endif /* CONFIG_MOUSE_PS2_CYPRESS */
+
+#endif  /* _CYPRESS_PS2_H */
-- 
1.7.10.4

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