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SubjectRe: [PATCH v5 2/3] input: Cypress PS/2 Trackpad psmouse driver
Hi Kamal,

On Wed, Dec 05, 2012 at 04:16:15PM -0800, Kamal Mostafa wrote:
> From: Dudley Du <dudl@cypress.com>
>
> Input/mouse driver for Cypress PS/2 Trackpad.
>
> Original code contributed by Dudley Du (Cypress Semiconductor Corporation),
> modified by Kamal Mostafa and Kyle Fazzari.
>
> BugLink: http://launchpad.net/bugs/978807
>
> Signed-off-by: Dudley Du <dudl@cypress.com>
> Signed-off-by: Kamal Mostafa <kamal@canonical.com>
> Signed-off-by: Kyle Fazzari <git@status.e4ward.com>
> Signed-off-by: Mario Limonciello <mario_limonciello@dell.com>
> Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
> Acked-by: Herton Krzesinski <herton.krzesinski@canonical.com>
> ---
> drivers/input/mouse/cypress_ps2.c | 740 +++++++++++++++++++++++++++++++++++++
> drivers/input/mouse/cypress_ps2.h | 216 +++++++++++
> 2 files changed, 956 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..02c4c61
> --- /dev/null
> +++ b/drivers/input/mouse/cypress_ps2.c
> @@ -0,0 +1,740 @@
> +/*
> + * Cypress Trackpad PS/2 mouse driver
> + *
> + * Copyright (c) 2012 Cypress Semiconductor Corporation.
> + *
> + * Author:
> + * Dudley Du <dudl@cypress.com>
> + *
> + * Additional contributors include:
> + * Kamal Mostafa <kamal@canonical.com>
> + * Kyle Fazzari <git@status.e4ward.com>
> + *
> + * 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"
> +
> +#undef CYTP_DEBUG_VERBOSE /* define this and DEBUG for more verbose dump */
> +
> +#define cytp_dbg(fmt, ...) psmouse_dbg(psmouse, pr_fmt(fmt), ##__VA_ARGS__)

Just use psmouse_dbg directly, no need to redefine it. And we might need
psmouse_vdbg() for your CYTP_DEBUG_VERBOSE bits.

> +
> +
> +static int is_cypress_key(const unsigned char *param)
> +{
> + return (param[0] == CYPRESS_KEY_1) && (param[1] == CYPRESS_KEY_2);

CYPRESS_KEY_1 and CYPRESS_KEY_2 and the function itself are misnamed.
Why key? If anything it's signature. I'd just use real constants with
proper comment right in cypress_detect().

> +}
> +
> +static void cypress_set_packet_size(struct psmouse *psmouse, unsigned int n)
> +{
> + struct cytp_data *cytp = psmouse->private;
> + psmouse->pktsize = cytp->pkt_size = n;

Why are we changing psmouse->pktsize all the time? Leave it at max.

> +}
> +
> +static void cypress_set_abs_rel_mode(struct cytp_data *cytp,
> + unsigned int cytp_mode_bit)
> +{
> + cytp->mode = (cytp->mode & ~CYTP_BIT_ABS_REL_MASK) | cytp_mode_bit;

I find this more confusing than if you manipulated the bits directly.
When I am looking at call sites I expect this function doing device IO
which it does not. Just set the bits directly.

> +}
> +
> +static const unsigned char cytp_rate[] = {10, 20, 40, 60, 100, 200};
> +static const unsigned char cytp_resolution[] = {0x00, 0x01, 0x02, 0x03};
> +
> +static int cypress_ps2_sendbyte(struct psmouse *psmouse, int value)
> +{
> + 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 byte (0xE8 or 0xF3).
> + * If sending the command fails, send recovery command
> + * to make the device return to the ready state.
> + */
> + 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;
> + 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_TP_METRICS)
> + 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(CYTP_CMD_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");

We have "%*ph" for this. Also I need to think some more about this
function but I do not like it as it messes too much with psmouse state.
I think there should be a better way.

> +
> +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)
> +{
> + 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_TP_METRICS))
> + return 0;

You do not need so many ().

> + 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)
> +{
> + 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)
> + continue;
> +
> + rc = cypress_verify_cmd_state(psmouse, cmd, param);
> + if (rc == 0)
> + return 0;
> + } while (--tries > 0);
> +
> + return -1;
> +}
> +
> +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;

-ENODEV here as well?

> +
> + 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->tp_metrics_supported = (param[2] & TP_METRICS_MASK) ? 1 : 0;
> +
> + cytp_dbg("cytp->fw_version = %d\n", cytp->fw_version);
> + cytp_dbg("cytp->tp_metrics_supported = %d\n",
> + cytp->tp_metrics_supported);
> + return 0;
> +}
> +
> +static int cypress_read_tp_metrics(struct psmouse *psmouse)
> +{
> + struct cytp_data *cytp = psmouse->private;
> + unsigned char param[8];
> +
> + /* set default values for tp metrics. */
> + 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_TP_METRICS, 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] & TP_METRICS_BIT_APA)
> + cytp->tp_type = CYTP_APA;
> + else if (param[6] & TP_METRICS_BIT_MTG)
> + cytp->tp_type = CYTP_MTG;
> + else
> + cytp->tp_type = CYTP_STG;
> + cytp->tp_palm = (param[6] & TP_METRICS_BIT_PALM) ? 1 : 0;
> + cytp->tp_stubborn = (param[6] & TP_METRICS_BIT_STUBBORN) ? 1 : 0;
> + cytp->tp_2f_jitter = (param[6] & TP_METRICS_BIT_2F_JITTER) >> 4;
> + cytp->tp_1f_jitter = (param[6] & TP_METRICS_BIT_1F_JITTER) >> 2;
> + cytp->tp_abs_packet_format_set =
> + (param[7] & TP_METRICS_BIT_ABS_PKT_FORMAT_SET) >> 4;
> + cytp->tp_2f_spike = (param[7] & TP_METRICS_BIT_2F_SPIKE) >> 2;
> + cytp->tp_1f_spike = (param[7] & TP_METRICS_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;
> +

Again, some () can be dropped.

> + cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width;
> + cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high;
> +
> +#ifdef CYTP_DEBUG_VERBOSE
> + cytp_dbg("Dump trackpad hardware configuration as below:\n");
> + cytp_dbg("cytp->tp_width = %d\n", cytp->tp_width);
> + cytp_dbg("cytp->tp_high = %d\n", cytp->tp_high);
> + cytp_dbg("cytp->tp_max_abs_x = %d\n", cytp->tp_max_abs_x);
> + cytp_dbg("cytp->tp_max_abs_y = %d\n", cytp->tp_max_abs_y);
> + cytp_dbg("cytp->tp_min_pressure = %d\n", cytp->tp_min_pressure);
> + cytp_dbg("cytp->tp_max_pressure = %d\n", cytp->tp_max_pressure);
> + cytp_dbg("cytp->tp_res_x = %d\n", cytp->tp_res_x);
> + cytp_dbg("cytp->tp_res_y = %d\n", cytp->tp_res_y);
> + cytp_dbg("cytp->tp_type = %d\n", cytp->tp_type);
> + cytp_dbg("cytp->tp_palm = %d\n", cytp->tp_palm);
> + cytp_dbg("cytp->tp_stubborn = %d\n", cytp->tp_stubborn);
> + cytp_dbg("cytp->tp_1f_jitter = %d\n", cytp->tp_1f_jitter);
> + cytp_dbg("cytp->tp_2f_jitter = %d\n", cytp->tp_2f_jitter);
> + cytp_dbg("cytp->tp_1f_spike = %d\n", cytp->tp_1f_spike);
> + cytp_dbg("cytp->tp_2f_spike = %d\n", cytp->tp_2f_spike);
> + cytp_dbg("cytp->tp_abs_packet_format_set = %d\n",
> + cytp->tp_abs_packet_format_set);
> +#endif
> +
> + return 0;
> +}
> +
> +static int cypress_query_hardware(struct psmouse *psmouse)
> +{
> + struct cytp_data *cytp = psmouse->private;
> + int ret;
> +
> + ret = cypress_read_fw_version(psmouse);
> + if (ret)
> + return ret;
> +
> + if (cytp->tp_metrics_supported) {
> + ret = cypress_read_tp_metrics(psmouse);
> + if (ret)
> + return ret;
> + }
> +
> + 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;
> +
> + cypress_set_abs_rel_mode(cytp, CYTP_BIT_ABS_PRESSURE);
> + cypress_set_packet_size(psmouse, 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);
> +
> + cypress_set_abs_rel_mode(cytp, CYTP_BIT_STANDARD_REL);
> + cypress_set_packet_size(psmouse, 3);
> +
> + cytp->prev_contact_cnt = 0;

No, just call psmouse_reset(), the rest is not needed.

> +}
> +
> +static int cypress_set_input_params(struct input_dev *input,
> + struct cytp_data *cytp)
> +{
> + int ret;
> +
> + if (!(cytp->tp_res_x && cytp->tp_res_y))

Too many ().

> + return -EINVAL;
> +
> + __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,
> + INPUT_MT_DROP_UNUSED|INPUT_MT_TRACK);
> + if (ret < 0)
> + return ret;
> +
> + __set_bit(INPUT_PROP_SEMI_MT, input->propbit);
> +
> + 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(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);
> +
> + __clear_bit(EV_REL, input->evbit);
> + __clear_bit(REL_X, input->relbit);
> + __clear_bit(REL_Y, input->relbit);
> +
> + __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);

I do not think it should be marked INPUT_PROP_BUTTONPAD if it has
physical buttons...

> + __set_bit(EV_KEY, input->evbit);
> + __set_bit(BTN_LEFT, input->keybit);
> + __set_bit(BTN_RIGHT, input->keybit);
> + __set_bit(BTN_MIDDLE, input->keybit);
> +
> + 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)
> + return 1;
> +
> + if (header_byte & ABS_HSCROLL_BIT) {
> + if (finger_count == 0) {

switch (finger_count) {
case 0:
case 2:
default:
}
> + /* HSCROLL gets added on to 0 finger count. */
> + finger_count = 4;
> + /* should remove HSCROLL bit. */
> + } else {
> + if (finger_count == 2) {
> + finger_count = 5;
> + /* should remove HSCROLL bit. */
> + } else {
> + /* Invalid contact (e.g. palm). Ignore it. */
> + finger_count = 0;
> + }
> + }
> + }
> +
> + return finger_count;
> +}
> +
> +
> +static int cypress_parse_packet(struct psmouse *psmouse,
> + struct cytp_data *cytp, struct cytp_report_data *report_data)
> +{
> + unsigned char *packet = psmouse->packet;
> + unsigned char header_byte = packet[0];
> +
> + memset(report_data, 0, sizeof(struct cytp_report_data));
> +
> + report_data->contact_cnt = cypress_get_finger_count(header_byte);
> +
> + if (report_data->contact_cnt == 0) /* e.g. palm detect */
> + return 0;
> +
> + report_data->tap = (header_byte & ABS_MULTIFINGER_TAP) ? 1 : 0;
> +
> + 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];
> +
> + } 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;
> + }
> +
> + report_data->left = (header_byte & BTN_LEFT_BIT) ? 1 : 0;
> + report_data->right = (header_byte & BTN_RIGHT_BIT) ? 1 : 0;
> +
> + /* 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. */

The preferred comment format is:

/*
* Text
* text
*/

> + if (report_data->tap)
> + report_data->left = 0;
> +
> +#ifdef CYTP_DEBUG_VERBOSE
> + {
> + int i;
> + int n = report_data->contact_cnt;
> + cytp_dbg("cypress_parse_packet cytp->zero_packet_cnt = %d\n",
> + cytp->zero_packet_cnt);
> + cytp_dbg("Dump parsed report data as below:\n");
> + cytp_dbg("contact_cnt = %d\n", report_data->contact_cnt);
> + if (n > CYTP_MAX_MT_SLOTS)
> + n = CYTP_MAX_MT_SLOTS;
> + for (i = 0; i < n; i++)
> + cytp_dbg("contacts[%d] = {%d, %d, %d}\n", i,
> + report_data->contacts[i].x,
> + report_data->contacts[i].y,
> + report_data->contacts[i].z);
> + cytp_dbg("left = %d\n", report_data->left);
> + cytp_dbg("right = %d\n", report_data->right);
> + cytp_dbg("middle = %d\n", report_data->middle);
> + }
> +#endif
> +
> + 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;
> + struct cytp_contact *contact;
> + struct input_mt_pos pos[CYTP_MAX_MT_SLOTS];
> + int slots[CYTP_MAX_MT_SLOTS];
> + int n;
> +
> + if (cypress_parse_packet(psmouse, cytp, &report_data))
> + return;
> +
> + n = report_data.contact_cnt;
> +
> + if (n > CYTP_MAX_MT_SLOTS)
> + n = CYTP_MAX_MT_SLOTS;
> +
> + for (i = 0; i < n; i++) {
> + contact = &report_data.contacts[i];
> + pos[i].x = contact->x;
> + pos[i].y = contact->y;
> + }
> +
> + input_mt_assign_slots(input, slots, pos, n);
> +
> + for (i = 0; i < n; i++) {
> + contact = &report_data.contacts[i];
> + input_mt_slot(input, slots[i]);
> + 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);
> + }
> +
> + input_mt_sync_frame(input);
> +
> + input_mt_report_finger_count(input, report_data.contact_cnt);
> +
> + 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) {

It can't be anything else, can it?

> + 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) {
> + cypress_set_packet_size(psmouse, 4);
> + if (contact_cnt == 2)
> + cypress_set_packet_size(psmouse, 7);
> + } else {
> + cypress_set_packet_size(psmouse, 5);
> + if (contact_cnt == 2)
> + cypress_set_packet_size(psmouse, 8);
> + }
> + }
> + }
> +
> + 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->mode |= CYTP_BIT_HIGH_RATE;
> + } else {
> + psmouse->rate = 40;
> + cytp->mode &= ~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) {
> + psmouse_err(psmouse, "Reconnect: unable to detect trackpad.\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, "init: Unable to initialize Cypress absolute mode.\n");
> + goto err_exit;
> + }
> +
> + if (cypress_set_input_params(psmouse->dev, cytp) < 0) {
> + psmouse_err(psmouse, "init: Unable to set input params.\n");
> + goto err_exit;
> + }
> +
> + 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..142fa8f
> --- /dev/null
> +++ b/drivers/input/mouse/cypress_ps2.h
> @@ -0,0 +1,216 @@
> +#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_TP_METRICS 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 TP_METRICS_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 TP_METRICS_BIT_PALM 0x80
> +#define TP_METRICS_BIT_STUBBORN 0x40
> +#define TP_METRICS_BIT_2F_JITTER 0x30
> +#define TP_METRICS_BIT_1F_JITTER 0x0c
> +#define TP_METRICS_BIT_APA 0x02
> +#define TP_METRICS_BIT_MTG 0x01
> +#define TP_METRICS_BIT_ABS_PKT_FORMAT_SET 0xf0
> +#define TP_METRICS_BIT_2F_SPIKE 0x0c
> +#define TP_METRICS_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_MT_SLOTS 2
> +
> +enum cytp_type {
> + CYTP_STG,
> + CYTP_MTG,
> + CYTP_APA,
> +};
> +
> +struct cytp_contact {
> + int x;
> + int y;
> + int z; /* also named as touch pressure. */
> +};
> +
> +/* The structure of Cypress Trackpad event data. */
> +struct cytp_report_data {
> + int contact_cnt;
> + struct cytp_contact contacts[CYTP_MAX_MT_SLOTS];
> + unsigned int left:1;
> + unsigned int right:1;
> + unsigned int middle:1;
> + unsigned int tap:1; /* multi-finger tap detected. */
> +};
> +
> +/* 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 absolute units that can be reported. */
> + int tp_max_abs_y; /* Max Y absolute units that 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;
I do not think most of these needs to be stored here.

> +
> + int tp_metrics_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!

--
Dmitry


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