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

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Hi Kamal,

> 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

Reading the patch, it looks very much like a typical semi-mt device to
me. Any good reason not to handle it that way?

> 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

Thse two look identical, why not define one in terms of the other?

> +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)");

Why is this configurable?

> +/* 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)

Clearly this can be simplified.

> +#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));

Line seems too long.

> +
> +	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;

A return 0 here?

> +	} 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;

Odd parenthesis. Can tp_min_pressure be zero? Don't we trust the
values coming from the device?

> +
> +	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);

Please report two fingers here, and set the SEMI_MT property.

> +		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);
> +	}

Duplicate pieces outside the if-else, please.

> +
> +	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;
> +}

Please skip.

> +
> +#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;
> +}

Please skip. Most, if not all, semi-mt devices report the corners
(min(x1, x2), min(y1, y2)) and (max(x1, x2), max(y1, y2)). IIRC, and
if your device is really helped by it, you can also provide the two
coordinates as reported by the device. From this patch, it seems you
manually track the fingers, which is then better done using
input_mt_assign_slots().

> +#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 },
> +};

Please skip.

> +
> +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;
> +}

Please skip.

> +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;
> +		}
> +	}
> +}

Please skip.

> +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) {

>= 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;
> +		}

Please skip.

> +
> +		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;

Please don't duplicate code.

> +
> +		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;

How can this happen?

> +
> +	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);
> +	}

Two fingers only please

> +	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);
> +		}

Please use input_assign_slots() instead of the above.

> +
> +		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);

No duplication, please.

> +
> +		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;
> +	}

Odd placement given the function's name?

> +
> +	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

Are all these values used?

> +
> +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
> 

Thanks,
Henrik
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