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OpenCellular/driver/touchpad_elan.c
Nicolas Boichat fb58920c9e usb_hid_touchpad: Add timestamp field to touch events 
We use the unofficial, Windows 8, Relative Scan time HID usage
(Digitizer page, 0x56) to add timestamps to our HID touchpad
events.

The timestamps is a rolling, unsigned, 16-bit integer, with a
resolution of 100us (so it wraps around every 6.5s).

The host will be able to synchronize to that timestamp, resetting
an offset every time the touchpad is quiet a certain amount of
time (e.g. 1 second).

BRANCH=none
BUG=b:63685117
TEST=Flash hammer, timestamps are reported in HID descriptor.

Change-Id: Ie5d56a9df14e464d2cdcd559f550d6e3cc81961f
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/603041
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
2017-08-16 06:03:49 -07:00

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/* Copyright 2016 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "common.h"
#include "console.h"
#include "touchpad_elan.h"
#include "gpio.h"
#include "hwtimer.h"
#include "i2c.h"
#include "task.h"
#include "timer.h"
#include "update_fw.h"
#include "util.h"
#include "usb_hid_touchpad.h"
/* Console output macros */
#define CPUTS(outstr) cputs(CC_TOUCHPAD, outstr)
#define CPRINTF(format, args...) cprintf(CC_TOUCHPAD, format, ## args)
#define CPRINTS(format, args...) cprints(CC_TOUCHPAD, format, ## args)
/******************************************************************************/
/* How to talk to the controller */
/******************************************************************************/
#define ELAN_VENDOR_ID 0x04f3
#define ETP_I2C_RESET 0x0100
#define ETP_I2C_WAKE_UP 0x0800
#define ETP_I2C_SLEEP 0x0801
#define ETP_I2C_STAND_CMD 0x0005
#define ETP_I2C_UNIQUEID_CMD 0x0101
#define ETP_I2C_FW_VERSION_CMD 0x0102
#define ETP_I2C_XY_TRACENUM_CMD 0x0105
#define ETP_I2C_MAX_X_AXIS_CMD 0x0106
#define ETP_I2C_MAX_Y_AXIS_CMD 0x0107
#define ETP_I2C_RESOLUTION_CMD 0x0108
#define ETP_I2C_PRESSURE_CMD 0x010A
#define ETP_I2C_SET_CMD 0x0300
#define ETP_I2C_FW_CHECKSUM_CMD 0x030F
#define ETP_ENABLE_ABS 0x0001
#define ETP_I2C_REPORT_LEN 34
#define ETP_MAX_FINGERS 5
#define ETP_FINGER_DATA_LEN 5
#define ETP_PRESSURE_OFFSET 25
#define ETP_FWIDTH_REDUCE 90
#define ETP_REPORT_ID 0x5D
#define ETP_REPORT_ID_OFFSET 2
#define ETP_TOUCH_INFO_OFFSET 3
#define ETP_FINGER_DATA_OFFSET 4
#define ETP_HOVER_INFO_OFFSET 30
#define ETP_MAX_REPORT_LEN 34
struct {
/* Max X/Y position */
uint16_t max_x;
uint16_t max_y;
/* Scaling factor for finger width/height */
uint16_t width_x;
uint16_t width_y;
/* Pressure adjustment */
uint8_t pressure_adj;
} elan_tp_params;
/*
* Report a more reasonable pressure value, so that no adjustment is necessary
* on Chrome OS side. 3216/1024 ~= 3.1416.
*/
const int pressure_mult = 3216;
const int pressure_div = 1024;
static int elan_tp_read_cmd(uint16_t reg, uint16_t *val)
{
uint8_t buf[2];
int rv;
buf[0] = reg;
buf[1] = reg >> 8;
i2c_lock(CONFIG_TOUCHPAD_I2C_PORT, 1);
rv = i2c_xfer(CONFIG_TOUCHPAD_I2C_PORT, CONFIG_TOUCHPAD_I2C_ADDR,
buf, sizeof(buf), (uint8_t *)val, sizeof(*val),
I2C_XFER_SINGLE);
i2c_lock(CONFIG_TOUCHPAD_I2C_PORT, 0);
return rv;
}
static int elan_tp_write_cmd(uint16_t reg, uint16_t val)
{
uint8_t buf[4];
int rv;
buf[0] = reg;
buf[1] = reg >> 8;
buf[2] = val;
buf[3] = val >> 8;
i2c_lock(CONFIG_TOUCHPAD_I2C_PORT, 1);
rv = i2c_xfer(CONFIG_TOUCHPAD_I2C_PORT, CONFIG_TOUCHPAD_I2C_ADDR,
buf, sizeof(buf), NULL, 0, I2C_XFER_SINGLE);
i2c_lock(CONFIG_TOUCHPAD_I2C_PORT, 0);
return rv;
}
static int finger_status[ETP_MAX_FINGERS] = {0};
/*
* Timestamp of last interrupt (32 bits are enough as we divide the value by 100
* and then put it in a 16-bit field).
*/
static uint32_t irq_ts;
static int elan_tp_read_report(void)
{
int rv;
uint8_t tp_buf[ETP_I2C_REPORT_LEN];
int i, ri;
uint8_t touch_info;
uint8_t hover_info;
uint8_t *finger = tp_buf+ETP_FINGER_DATA_OFFSET;
struct usb_hid_touchpad_report report;
uint16_t timestamp;
/* Compute and save timestamp early in case another interrupt comes. */
timestamp = irq_ts / USB_HID_TOUCHPAD_TIMESTAMP_UNIT;
i2c_lock(CONFIG_TOUCHPAD_I2C_PORT, 1);
rv = i2c_xfer(CONFIG_TOUCHPAD_I2C_PORT, CONFIG_TOUCHPAD_I2C_ADDR,
NULL, 0, tp_buf, ETP_I2C_REPORT_LEN, I2C_XFER_SINGLE);
i2c_lock(CONFIG_TOUCHPAD_I2C_PORT, 0);
if (rv) {
CPRINTS("read report error");
return rv;
}
if (tp_buf[ETP_REPORT_ID_OFFSET] != ETP_REPORT_ID) {
CPRINTS("Invalid report id (%x)", tp_buf[ETP_REPORT_ID_OFFSET]);
return -1;
}
memset(&report, 0, sizeof(report));
report.id = 0x01;
ri = 0; /* Next finger index in HID report */
touch_info = tp_buf[ETP_TOUCH_INFO_OFFSET];
hover_info = tp_buf[ETP_HOVER_INFO_OFFSET];
if (touch_info & 0x01)
report.button = 1;
if (hover_info & 0x40) {
/* TODO(crosbug.com/p/59083): Report hover event */
CPRINTF("[TP] hover!\n");
}
for (i = 0; i < ETP_MAX_FINGERS; i++) {
int valid = touch_info & (1 << (3+i));
if (valid) {
int width = (finger[3] & 0xf0) >> 4;
int height = finger[3] & 0x0f;
int pressure = finger[4] + elan_tp_params.pressure_adj;
pressure = DIV_ROUND_NEAREST(pressure * pressure_mult,
pressure_div);
width = MIN(4095, width * elan_tp_params.width_x);
height = MIN(4095, height * elan_tp_params.width_y);
pressure = MIN(1023, pressure);
report.finger[ri].tip = 1;
report.finger[ri].inrange = 1;
report.finger[ri].id = i;
report.finger[ri].width = width;
report.finger[ri].height = height;
report.finger[ri].x =
((finger[0] & 0xf0) << 4) | finger[1];
report.finger[ri].y =
elan_tp_params.max_y -
(((finger[0] & 0x0f) << 8) | finger[2]);
report.finger[ri].pressure = pressure;
finger += ETP_FINGER_DATA_LEN;
ri++;
finger_status[i] = 1;
} else if (finger_status[i]) {
report.finger[ri].id = i;
ri++;
finger_status[i] = 0;
}
}
report.count = ri;
report.timestamp = timestamp;
set_touchpad_report(&report);
return 0;
}
/* Initialize the controller ICs after reset */
static int elan_tp_init(void)
{
int rv;
uint8_t val[2];
int dpi_x, dpi_y;
CPRINTS("%s", __func__);
elan_tp_write_cmd(ETP_I2C_STAND_CMD, ETP_I2C_RESET);
msleep(100);
i2c_lock(CONFIG_TOUCHPAD_I2C_PORT, 1);
rv = i2c_xfer(CONFIG_TOUCHPAD_I2C_PORT, CONFIG_TOUCHPAD_I2C_ADDR,
NULL, 0, val, sizeof(val), I2C_XFER_SINGLE);
i2c_lock(CONFIG_TOUCHPAD_I2C_PORT, 0);
CPRINTS("reset rv %d buf=%04x", rv, *((uint16_t *)val));
if (rv)
goto out;
/* Read min/max */
rv = elan_tp_read_cmd(ETP_I2C_MAX_X_AXIS_CMD, &elan_tp_params.max_x);
if (rv)
goto out;
rv = elan_tp_read_cmd(ETP_I2C_MAX_Y_AXIS_CMD, &elan_tp_params.max_y);
if (rv)
goto out;
/* Read min/max */
rv = elan_tp_read_cmd(ETP_I2C_XY_TRACENUM_CMD, (uint16_t *)val);
if (rv)
goto out;
if (val[0] == 0 || val[1] == 0) {
CPRINTS("Invalid XY_TRACENUM");
goto out;
}
/* ETP_FWIDTH_REDUCE reduces the apparent width to avoid treating large
* finger as palm. Multiply value by 2 as HID multitouch divides it.
*/
elan_tp_params.width_x =
2 * ((elan_tp_params.max_x / val[0]) - ETP_FWIDTH_REDUCE);
elan_tp_params.width_y =
2 * ((elan_tp_params.max_y / val[1]) - ETP_FWIDTH_REDUCE);
rv = elan_tp_read_cmd(ETP_I2C_PRESSURE_CMD, (uint16_t *)val);
if (rv)
goto out;
elan_tp_params.pressure_adj = (val[0] & 0x10) ? 0 : ETP_PRESSURE_OFFSET;
rv = elan_tp_read_cmd(ETP_I2C_RESOLUTION_CMD, (uint16_t *)val);
if (rv)
goto out;
dpi_x = 10*val[0] + 790;
dpi_y = 10*val[1] + 790;
CPRINTS("max=%d/%d width=%d/%d adj=%d dpi=%d/%d",
elan_tp_params.max_x, elan_tp_params.max_y,
elan_tp_params.width_x, elan_tp_params.width_y,
elan_tp_params.pressure_adj, dpi_x, dpi_y);
#ifdef CONFIG_USB_HID_TOUCHPAD
/*
* Sanity check dimensions provided at build time.
* - dpi == logical dimension / physical dimension (inches)
* (254 tenths of mm per inch)
*/
if (elan_tp_params.max_x != CONFIG_USB_HID_TOUCHPAD_LOGICAL_MAX_X ||
elan_tp_params.max_y != CONFIG_USB_HID_TOUCHPAD_LOGICAL_MAX_Y ||
dpi_x != 254*CONFIG_USB_HID_TOUCHPAD_LOGICAL_MAX_X /
CONFIG_USB_HID_TOUCHPAD_PHYSICAL_MAX_X ||
dpi_y != 254*CONFIG_USB_HID_TOUCHPAD_LOGICAL_MAX_Y /
CONFIG_USB_HID_TOUCHPAD_PHYSICAL_MAX_Y) {
CPRINTS("*** TP mismatch!");
}
#endif
/* Switch to absolute mode */
rv = elan_tp_write_cmd(ETP_I2C_SET_CMD, ETP_ENABLE_ABS);
if (rv)
goto out;
/* Sleep control off */
rv = elan_tp_write_cmd(ETP_I2C_STAND_CMD, ETP_I2C_WAKE_UP);
out:
CPRINTS("%s:%d", __func__, rv);
return rv;
}
#ifdef CONFIG_USB_UPDATE
int touchpad_get_info(struct touchpad_info *tp)
{
int rv;
uint16_t val;
tp->status = EC_RES_SUCCESS;
tp->vendor = ELAN_VENDOR_ID;
/* Get unique ID, FW, SM version. */
rv = elan_tp_read_cmd(ETP_I2C_UNIQUEID_CMD, &val);
if (rv)
return -1;
tp->elan.id = val;
rv = elan_tp_read_cmd(ETP_I2C_FW_VERSION_CMD, &val);
if (rv)
return -1;
tp->elan.fw_version = val & 0xff;
rv = elan_tp_read_cmd(ETP_I2C_FW_CHECKSUM_CMD, &val);
if (rv)
return -1;
tp->elan.fw_checksum = val;
return sizeof(*tp);
}
#endif
void elan_tp_interrupt(enum gpio_signal signal)
{
irq_ts = __hw_clock_source_read();
task_wake(TASK_ID_TOUCHPAD);
}
void elan_tp_task(void *u)
{
elan_tp_init();
gpio_enable_interrupt(GPIO_TOUCHPAD_INT);
while (1) {
task_wait_event(-1);
elan_tp_read_report();
}
}
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