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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 "i2c.h"
#include "task.h"
#include "timer.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 ETP_I2C_RESET 0x0100
#define ETP_I2C_WAKE_UP 0x0800
#define ETP_I2C_SLEEP 0x0801
#define ETP_I2C_STAND_CMD 0x0005
#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_PRESSURE_CMD 0x010A
#define ETP_I2C_SET_CMD 0x0300
#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.
*/
const int pressure_mult = 3;
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};
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;
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;
width = MIN(4095, width * elan_tp_params.width_x);
height = MIN(4095, height * elan_tp_params.width_y);
pressure = MIN(255, pressure * pressure_mult);
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;
set_touchpad_report(&report);
return 0;
}
/* Initialize the controller ICs after reset */
static int elan_tp_init(void)
{
int rv;
uint8_t val[2];
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;
CPRINTS("max=%d/%d width=%d/%d adj=%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);
/* 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;
}
void elan_tp_interrupt(enum gpio_signal signal)
{
task_wake(TASK_ID_TOUCHPAD);
}
void elan_tp_task(void)
{
elan_tp_init();
gpio_enable_interrupt(GPIO_TOUCHPAD_INT);
while (1) {
task_wait_event(-1);
elan_tp_read_report();
}
}
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