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/* Copyright 2020 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* Implementation of I2C HID for touchpads */
#ifndef __CROS_EC_I2C_HID_TOUCHPAD_H
#define __CROS_EC_I2C_HID_TOUCHPAD_H
#include "common.h"
#include "i2c_hid.h"
#include "stdbool.h"
#include "stdint.h"
/* Max fingers to support */
#define I2C_HID_TOUCHPAD_MAX_FINGERS 5
/*
* Struct holding a touchpad event
*
* The user should parse the original touchpad report, apply necessary
* transformations and fill the result in this common struct. The touchpad is
* assumed to implement the Linux HID MT-B protocol.
*/
struct touchpad_event {
/* If hover is detected */
bool hover;
/* If button is clicked */
bool button;
/* Struct for contacts */
struct {
/* X & Y of the contact */
uint16_t x;
uint16_t y;
/* Pressure/contact area */
uint16_t pressure;
/* W & H of the contact */
uint16_t width;
uint16_t height;
/*
* Orientation of the contact ellipse. Can be plain 0 if
* unavailable.
*/
uint16_t orientation;
/*
* If the touchpad believes it is a palm. Some touchpads report
* it through the confidence field.
*/
bool is_palm;
/* If this slot contains valid contact (touching the surface) */
bool valid;
} __packed finger[I2C_HID_TOUCHPAD_MAX_FINGERS];
} __packed;
/* Initialize the I2C HID touchpad */
void i2c_hid_touchpad_init(void);
/*
* Process an I2C-HID command from host.
*
* @param len >= 0 - Input data length in bytes
* @param buffer Shared input/output buffer
* @param send_response Function to send the response to host
* @param data Extracted request content if there is any
* @param reg I2C HID register as defined in include/i2c-hid.h
* @param cmd I2C HID command as defined in common/i2c_hid_touchpad.c
*
* @return EC_SUCCESS, or non-zero if error.
*/
int i2c_hid_touchpad_process(unsigned int len, uint8_t *buffer,
void (*send_response)(int len), uint8_t *data,
int *reg, int *cmd);
/**
* Compile an (outgoing) HID input report for an (incoming) touchpad event
*
* The compiled report would be sent next time when the host requests one.
*
* @param touchpad_event Touchpad event data
*/
void i2c_hid_compile_report(struct touchpad_event *event);
#endif /* __CROS_EC_I2C_HID_TOUCHPAD_H */
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