// SPDX-License-Identifier: GPL-2.0-or-later
|
/*
|
* AD714X CapTouch Programmable Controller driver supporting AD7142/3/7/8/7A
|
*
|
* Copyright 2009-2011 Analog Devices Inc.
|
*/
|
|
#include <linux/device.h>
|
#include <linux/input.h>
|
#include <linux/interrupt.h>
|
#include <linux/slab.h>
|
#include <linux/input/ad714x.h>
|
#include <linux/module.h>
|
#include "ad714x.h"
|
|
#define AD714X_PWR_CTRL 0x0
|
#define AD714X_STG_CAL_EN_REG 0x1
|
#define AD714X_AMB_COMP_CTRL0_REG 0x2
|
#define AD714X_PARTID_REG 0x17
|
#define AD7142_PARTID 0xE620
|
#define AD7143_PARTID 0xE630
|
#define AD7147_PARTID 0x1470
|
#define AD7148_PARTID 0x1480
|
#define AD714X_STAGECFG_REG 0x80
|
#define AD714X_SYSCFG_REG 0x0
|
|
#define STG_LOW_INT_EN_REG 0x5
|
#define STG_HIGH_INT_EN_REG 0x6
|
#define STG_COM_INT_EN_REG 0x7
|
#define STG_LOW_INT_STA_REG 0x8
|
#define STG_HIGH_INT_STA_REG 0x9
|
#define STG_COM_INT_STA_REG 0xA
|
|
#define CDC_RESULT_S0 0xB
|
#define CDC_RESULT_S1 0xC
|
#define CDC_RESULT_S2 0xD
|
#define CDC_RESULT_S3 0xE
|
#define CDC_RESULT_S4 0xF
|
#define CDC_RESULT_S5 0x10
|
#define CDC_RESULT_S6 0x11
|
#define CDC_RESULT_S7 0x12
|
#define CDC_RESULT_S8 0x13
|
#define CDC_RESULT_S9 0x14
|
#define CDC_RESULT_S10 0x15
|
#define CDC_RESULT_S11 0x16
|
|
#define STAGE0_AMBIENT 0xF1
|
#define STAGE1_AMBIENT 0x115
|
#define STAGE2_AMBIENT 0x139
|
#define STAGE3_AMBIENT 0x15D
|
#define STAGE4_AMBIENT 0x181
|
#define STAGE5_AMBIENT 0x1A5
|
#define STAGE6_AMBIENT 0x1C9
|
#define STAGE7_AMBIENT 0x1ED
|
#define STAGE8_AMBIENT 0x211
|
#define STAGE9_AMBIENT 0x234
|
#define STAGE10_AMBIENT 0x259
|
#define STAGE11_AMBIENT 0x27D
|
|
#define PER_STAGE_REG_NUM 36
|
#define STAGE_CFGREG_NUM 8
|
#define SYS_CFGREG_NUM 8
|
|
/*
|
* driver information which will be used to maintain the software flow
|
*/
|
enum ad714x_device_state { IDLE, JITTER, ACTIVE, SPACE };
|
|
struct ad714x_slider_drv {
|
int highest_stage;
|
int abs_pos;
|
int flt_pos;
|
enum ad714x_device_state state;
|
struct input_dev *input;
|
};
|
|
struct ad714x_wheel_drv {
|
int abs_pos;
|
int flt_pos;
|
int pre_highest_stage;
|
int highest_stage;
|
enum ad714x_device_state state;
|
struct input_dev *input;
|
};
|
|
struct ad714x_touchpad_drv {
|
int x_highest_stage;
|
int x_flt_pos;
|
int x_abs_pos;
|
int y_highest_stage;
|
int y_flt_pos;
|
int y_abs_pos;
|
int left_ep;
|
int left_ep_val;
|
int right_ep;
|
int right_ep_val;
|
int top_ep;
|
int top_ep_val;
|
int bottom_ep;
|
int bottom_ep_val;
|
enum ad714x_device_state state;
|
struct input_dev *input;
|
};
|
|
struct ad714x_button_drv {
|
enum ad714x_device_state state;
|
/*
|
* Unlike slider/wheel/touchpad, all buttons point to
|
* same input_dev instance
|
*/
|
struct input_dev *input;
|
};
|
|
struct ad714x_driver_data {
|
struct ad714x_slider_drv *slider;
|
struct ad714x_wheel_drv *wheel;
|
struct ad714x_touchpad_drv *touchpad;
|
struct ad714x_button_drv *button;
|
};
|
|
/*
|
* information to integrate all things which will be private data
|
* of spi/i2c device
|
*/
|
|
static void ad714x_use_com_int(struct ad714x_chip *ad714x,
|
int start_stage, int end_stage)
|
{
|
unsigned short data;
|
unsigned short mask;
|
|
mask = ((1 << (end_stage + 1)) - 1) - ((1 << start_stage) - 1);
|
|
ad714x->read(ad714x, STG_COM_INT_EN_REG, &data, 1);
|
data |= 1 << end_stage;
|
ad714x->write(ad714x, STG_COM_INT_EN_REG, data);
|
|
ad714x->read(ad714x, STG_HIGH_INT_EN_REG, &data, 1);
|
data &= ~mask;
|
ad714x->write(ad714x, STG_HIGH_INT_EN_REG, data);
|
}
|
|
static void ad714x_use_thr_int(struct ad714x_chip *ad714x,
|
int start_stage, int end_stage)
|
{
|
unsigned short data;
|
unsigned short mask;
|
|
mask = ((1 << (end_stage + 1)) - 1) - ((1 << start_stage) - 1);
|
|
ad714x->read(ad714x, STG_COM_INT_EN_REG, &data, 1);
|
data &= ~(1 << end_stage);
|
ad714x->write(ad714x, STG_COM_INT_EN_REG, data);
|
|
ad714x->read(ad714x, STG_HIGH_INT_EN_REG, &data, 1);
|
data |= mask;
|
ad714x->write(ad714x, STG_HIGH_INT_EN_REG, data);
|
}
|
|
static int ad714x_cal_highest_stage(struct ad714x_chip *ad714x,
|
int start_stage, int end_stage)
|
{
|
int max_res = 0;
|
int max_idx = 0;
|
int i;
|
|
for (i = start_stage; i <= end_stage; i++) {
|
if (ad714x->sensor_val[i] > max_res) {
|
max_res = ad714x->sensor_val[i];
|
max_idx = i;
|
}
|
}
|
|
return max_idx;
|
}
|
|
static int ad714x_cal_abs_pos(struct ad714x_chip *ad714x,
|
int start_stage, int end_stage,
|
int highest_stage, int max_coord)
|
{
|
int a_param, b_param;
|
|
if (highest_stage == start_stage) {
|
a_param = ad714x->sensor_val[start_stage + 1];
|
b_param = ad714x->sensor_val[start_stage] +
|
ad714x->sensor_val[start_stage + 1];
|
} else if (highest_stage == end_stage) {
|
a_param = ad714x->sensor_val[end_stage] *
|
(end_stage - start_stage) +
|
ad714x->sensor_val[end_stage - 1] *
|
(end_stage - start_stage - 1);
|
b_param = ad714x->sensor_val[end_stage] +
|
ad714x->sensor_val[end_stage - 1];
|
} else {
|
a_param = ad714x->sensor_val[highest_stage] *
|
(highest_stage - start_stage) +
|
ad714x->sensor_val[highest_stage - 1] *
|
(highest_stage - start_stage - 1) +
|
ad714x->sensor_val[highest_stage + 1] *
|
(highest_stage - start_stage + 1);
|
b_param = ad714x->sensor_val[highest_stage] +
|
ad714x->sensor_val[highest_stage - 1] +
|
ad714x->sensor_val[highest_stage + 1];
|
}
|
|
return (max_coord / (end_stage - start_stage)) * a_param / b_param;
|
}
|
|
/*
|
* One button can connect to multi positive and negative of CDCs
|
* Multi-buttons can connect to same positive/negative of one CDC
|
*/
|
static void ad714x_button_state_machine(struct ad714x_chip *ad714x, int idx)
|
{
|
struct ad714x_button_plat *hw = &ad714x->hw->button[idx];
|
struct ad714x_button_drv *sw = &ad714x->sw->button[idx];
|
|
switch (sw->state) {
|
case IDLE:
|
if (((ad714x->h_state & hw->h_mask) == hw->h_mask) &&
|
((ad714x->l_state & hw->l_mask) == hw->l_mask)) {
|
dev_dbg(ad714x->dev, "button %d touched\n", idx);
|
input_report_key(sw->input, hw->keycode, 1);
|
input_sync(sw->input);
|
sw->state = ACTIVE;
|
}
|
break;
|
|
case ACTIVE:
|
if (((ad714x->h_state & hw->h_mask) != hw->h_mask) ||
|
((ad714x->l_state & hw->l_mask) != hw->l_mask)) {
|
dev_dbg(ad714x->dev, "button %d released\n", idx);
|
input_report_key(sw->input, hw->keycode, 0);
|
input_sync(sw->input);
|
sw->state = IDLE;
|
}
|
break;
|
|
default:
|
break;
|
}
|
}
|
|
/*
|
* The response of a sensor is defined by the absolute number of codes
|
* between the current CDC value and the ambient value.
|
*/
|
static void ad714x_slider_cal_sensor_val(struct ad714x_chip *ad714x, int idx)
|
{
|
struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx];
|
int i;
|
|
ad714x->read(ad714x, CDC_RESULT_S0 + hw->start_stage,
|
&ad714x->adc_reg[hw->start_stage],
|
hw->end_stage - hw->start_stage + 1);
|
|
for (i = hw->start_stage; i <= hw->end_stage; i++) {
|
ad714x->read(ad714x, STAGE0_AMBIENT + i * PER_STAGE_REG_NUM,
|
&ad714x->amb_reg[i], 1);
|
|
ad714x->sensor_val[i] =
|
abs(ad714x->adc_reg[i] - ad714x->amb_reg[i]);
|
}
|
}
|
|
static void ad714x_slider_cal_highest_stage(struct ad714x_chip *ad714x, int idx)
|
{
|
struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx];
|
struct ad714x_slider_drv *sw = &ad714x->sw->slider[idx];
|
|
sw->highest_stage = ad714x_cal_highest_stage(ad714x, hw->start_stage,
|
hw->end_stage);
|
|
dev_dbg(ad714x->dev, "slider %d highest_stage:%d\n", idx,
|
sw->highest_stage);
|
}
|
|
/*
|
* The formulae are very straight forward. It uses the sensor with the
|
* highest response and the 2 adjacent ones.
|
* When Sensor 0 has the highest response, only sensor 0 and sensor 1
|
* are used in the calculations. Similarly when the last sensor has the
|
* highest response, only the last sensor and the second last sensors
|
* are used in the calculations.
|
*
|
* For i= idx_of_peak_Sensor-1 to i= idx_of_peak_Sensor+1
|
* v += Sensor response(i)*i
|
* w += Sensor response(i)
|
* POS=(Number_of_Positions_Wanted/(Number_of_Sensors_Used-1)) *(v/w)
|
*/
|
static void ad714x_slider_cal_abs_pos(struct ad714x_chip *ad714x, int idx)
|
{
|
struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx];
|
struct ad714x_slider_drv *sw = &ad714x->sw->slider[idx];
|
|
sw->abs_pos = ad714x_cal_abs_pos(ad714x, hw->start_stage, hw->end_stage,
|
sw->highest_stage, hw->max_coord);
|
|
dev_dbg(ad714x->dev, "slider %d absolute position:%d\n", idx,
|
sw->abs_pos);
|
}
|
|
/*
|
* To minimise the Impact of the noise on the algorithm, ADI developed a
|
* routine that filters the CDC results after they have been read by the
|
* host processor.
|
* The filter used is an Infinite Input Response(IIR) filter implemented
|
* in firmware and attenuates the noise on the CDC results after they've
|
* been read by the host processor.
|
* Filtered_CDC_result = (Filtered_CDC_result * (10 - Coefficient) +
|
* Latest_CDC_result * Coefficient)/10
|
*/
|
static void ad714x_slider_cal_flt_pos(struct ad714x_chip *ad714x, int idx)
|
{
|
struct ad714x_slider_drv *sw = &ad714x->sw->slider[idx];
|
|
sw->flt_pos = (sw->flt_pos * (10 - 4) +
|
sw->abs_pos * 4)/10;
|
|
dev_dbg(ad714x->dev, "slider %d filter position:%d\n", idx,
|
sw->flt_pos);
|
}
|
|
static void ad714x_slider_use_com_int(struct ad714x_chip *ad714x, int idx)
|
{
|
struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx];
|
|
ad714x_use_com_int(ad714x, hw->start_stage, hw->end_stage);
|
}
|
|
static void ad714x_slider_use_thr_int(struct ad714x_chip *ad714x, int idx)
|
{
|
struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx];
|
|
ad714x_use_thr_int(ad714x, hw->start_stage, hw->end_stage);
|
}
|
|
static void ad714x_slider_state_machine(struct ad714x_chip *ad714x, int idx)
|
{
|
struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx];
|
struct ad714x_slider_drv *sw = &ad714x->sw->slider[idx];
|
unsigned short h_state, c_state;
|
unsigned short mask;
|
|
mask = ((1 << (hw->end_stage + 1)) - 1) - ((1 << hw->start_stage) - 1);
|
|
h_state = ad714x->h_state & mask;
|
c_state = ad714x->c_state & mask;
|
|
switch (sw->state) {
|
case IDLE:
|
if (h_state) {
|
sw->state = JITTER;
|
/* In End of Conversion interrupt mode, the AD714X
|
* continuously generates hardware interrupts.
|
*/
|
ad714x_slider_use_com_int(ad714x, idx);
|
dev_dbg(ad714x->dev, "slider %d touched\n", idx);
|
}
|
break;
|
|
case JITTER:
|
if (c_state == mask) {
|
ad714x_slider_cal_sensor_val(ad714x, idx);
|
ad714x_slider_cal_highest_stage(ad714x, idx);
|
ad714x_slider_cal_abs_pos(ad714x, idx);
|
sw->flt_pos = sw->abs_pos;
|
sw->state = ACTIVE;
|
}
|
break;
|
|
case ACTIVE:
|
if (c_state == mask) {
|
if (h_state) {
|
ad714x_slider_cal_sensor_val(ad714x, idx);
|
ad714x_slider_cal_highest_stage(ad714x, idx);
|
ad714x_slider_cal_abs_pos(ad714x, idx);
|
ad714x_slider_cal_flt_pos(ad714x, idx);
|
input_report_abs(sw->input, ABS_X, sw->flt_pos);
|
input_report_key(sw->input, BTN_TOUCH, 1);
|
} else {
|
/* When the user lifts off the sensor, configure
|
* the AD714X back to threshold interrupt mode.
|
*/
|
ad714x_slider_use_thr_int(ad714x, idx);
|
sw->state = IDLE;
|
input_report_key(sw->input, BTN_TOUCH, 0);
|
dev_dbg(ad714x->dev, "slider %d released\n",
|
idx);
|
}
|
input_sync(sw->input);
|
}
|
break;
|
|
default:
|
break;
|
}
|
}
|
|
/*
|
* When the scroll wheel is activated, we compute the absolute position based
|
* on the sensor values. To calculate the position, we first determine the
|
* sensor that has the greatest response among the 8 sensors that constitutes
|
* the scrollwheel. Then we determined the 2 sensors on either sides of the
|
* sensor with the highest response and we apply weights to these sensors.
|
*/
|
static void ad714x_wheel_cal_highest_stage(struct ad714x_chip *ad714x, int idx)
|
{
|
struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx];
|
struct ad714x_wheel_drv *sw = &ad714x->sw->wheel[idx];
|
|
sw->pre_highest_stage = sw->highest_stage;
|
sw->highest_stage = ad714x_cal_highest_stage(ad714x, hw->start_stage,
|
hw->end_stage);
|
|
dev_dbg(ad714x->dev, "wheel %d highest_stage:%d\n", idx,
|
sw->highest_stage);
|
}
|
|
static void ad714x_wheel_cal_sensor_val(struct ad714x_chip *ad714x, int idx)
|
{
|
struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx];
|
int i;
|
|
ad714x->read(ad714x, CDC_RESULT_S0 + hw->start_stage,
|
&ad714x->adc_reg[hw->start_stage],
|
hw->end_stage - hw->start_stage + 1);
|
|
for (i = hw->start_stage; i <= hw->end_stage; i++) {
|
ad714x->read(ad714x, STAGE0_AMBIENT + i * PER_STAGE_REG_NUM,
|
&ad714x->amb_reg[i], 1);
|
if (ad714x->adc_reg[i] > ad714x->amb_reg[i])
|
ad714x->sensor_val[i] =
|
ad714x->adc_reg[i] - ad714x->amb_reg[i];
|
else
|
ad714x->sensor_val[i] = 0;
|
}
|
}
|
|
/*
|
* When the scroll wheel is activated, we compute the absolute position based
|
* on the sensor values. To calculate the position, we first determine the
|
* sensor that has the greatest response among the sensors that constitutes
|
* the scrollwheel. Then we determined the sensors on either sides of the
|
* sensor with the highest response and we apply weights to these sensors. The
|
* result of this computation gives us the mean value.
|
*/
|
|
static void ad714x_wheel_cal_abs_pos(struct ad714x_chip *ad714x, int idx)
|
{
|
struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx];
|
struct ad714x_wheel_drv *sw = &ad714x->sw->wheel[idx];
|
int stage_num = hw->end_stage - hw->start_stage + 1;
|
int first_before, highest, first_after;
|
int a_param, b_param;
|
|
first_before = (sw->highest_stage + stage_num - 1) % stage_num;
|
highest = sw->highest_stage;
|
first_after = (sw->highest_stage + stage_num + 1) % stage_num;
|
|
a_param = ad714x->sensor_val[highest] *
|
(highest - hw->start_stage) +
|
ad714x->sensor_val[first_before] *
|
(highest - hw->start_stage - 1) +
|
ad714x->sensor_val[first_after] *
|
(highest - hw->start_stage + 1);
|
b_param = ad714x->sensor_val[highest] +
|
ad714x->sensor_val[first_before] +
|
ad714x->sensor_val[first_after];
|
|
sw->abs_pos = ((hw->max_coord / (hw->end_stage - hw->start_stage)) *
|
a_param) / b_param;
|
|
if (sw->abs_pos > hw->max_coord)
|
sw->abs_pos = hw->max_coord;
|
else if (sw->abs_pos < 0)
|
sw->abs_pos = 0;
|
}
|
|
static void ad714x_wheel_cal_flt_pos(struct ad714x_chip *ad714x, int idx)
|
{
|
struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx];
|
struct ad714x_wheel_drv *sw = &ad714x->sw->wheel[idx];
|
if (((sw->pre_highest_stage == hw->end_stage) &&
|
(sw->highest_stage == hw->start_stage)) ||
|
((sw->pre_highest_stage == hw->start_stage) &&
|
(sw->highest_stage == hw->end_stage)))
|
sw->flt_pos = sw->abs_pos;
|
else
|
sw->flt_pos = ((sw->flt_pos * 30) + (sw->abs_pos * 71)) / 100;
|
|
if (sw->flt_pos > hw->max_coord)
|
sw->flt_pos = hw->max_coord;
|
}
|
|
static void ad714x_wheel_use_com_int(struct ad714x_chip *ad714x, int idx)
|
{
|
struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx];
|
|
ad714x_use_com_int(ad714x, hw->start_stage, hw->end_stage);
|
}
|
|
static void ad714x_wheel_use_thr_int(struct ad714x_chip *ad714x, int idx)
|
{
|
struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx];
|
|
ad714x_use_thr_int(ad714x, hw->start_stage, hw->end_stage);
|
}
|
|
static void ad714x_wheel_state_machine(struct ad714x_chip *ad714x, int idx)
|
{
|
struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx];
|
struct ad714x_wheel_drv *sw = &ad714x->sw->wheel[idx];
|
unsigned short h_state, c_state;
|
unsigned short mask;
|
|
mask = ((1 << (hw->end_stage + 1)) - 1) - ((1 << hw->start_stage) - 1);
|
|
h_state = ad714x->h_state & mask;
|
c_state = ad714x->c_state & mask;
|
|
switch (sw->state) {
|
case IDLE:
|
if (h_state) {
|
sw->state = JITTER;
|
/* In End of Conversion interrupt mode, the AD714X
|
* continuously generates hardware interrupts.
|
*/
|
ad714x_wheel_use_com_int(ad714x, idx);
|
dev_dbg(ad714x->dev, "wheel %d touched\n", idx);
|
}
|
break;
|
|
case JITTER:
|
if (c_state == mask) {
|
ad714x_wheel_cal_sensor_val(ad714x, idx);
|
ad714x_wheel_cal_highest_stage(ad714x, idx);
|
ad714x_wheel_cal_abs_pos(ad714x, idx);
|
sw->flt_pos = sw->abs_pos;
|
sw->state = ACTIVE;
|
}
|
break;
|
|
case ACTIVE:
|
if (c_state == mask) {
|
if (h_state) {
|
ad714x_wheel_cal_sensor_val(ad714x, idx);
|
ad714x_wheel_cal_highest_stage(ad714x, idx);
|
ad714x_wheel_cal_abs_pos(ad714x, idx);
|
ad714x_wheel_cal_flt_pos(ad714x, idx);
|
input_report_abs(sw->input, ABS_WHEEL,
|
sw->flt_pos);
|
input_report_key(sw->input, BTN_TOUCH, 1);
|
} else {
|
/* When the user lifts off the sensor, configure
|
* the AD714X back to threshold interrupt mode.
|
*/
|
ad714x_wheel_use_thr_int(ad714x, idx);
|
sw->state = IDLE;
|
input_report_key(sw->input, BTN_TOUCH, 0);
|
|
dev_dbg(ad714x->dev, "wheel %d released\n",
|
idx);
|
}
|
input_sync(sw->input);
|
}
|
break;
|
|
default:
|
break;
|
}
|
}
|
|
static void touchpad_cal_sensor_val(struct ad714x_chip *ad714x, int idx)
|
{
|
struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx];
|
int i;
|
|
ad714x->read(ad714x, CDC_RESULT_S0 + hw->x_start_stage,
|
&ad714x->adc_reg[hw->x_start_stage],
|
hw->x_end_stage - hw->x_start_stage + 1);
|
|
for (i = hw->x_start_stage; i <= hw->x_end_stage; i++) {
|
ad714x->read(ad714x, STAGE0_AMBIENT + i * PER_STAGE_REG_NUM,
|
&ad714x->amb_reg[i], 1);
|
if (ad714x->adc_reg[i] > ad714x->amb_reg[i])
|
ad714x->sensor_val[i] =
|
ad714x->adc_reg[i] - ad714x->amb_reg[i];
|
else
|
ad714x->sensor_val[i] = 0;
|
}
|
}
|
|
static void touchpad_cal_highest_stage(struct ad714x_chip *ad714x, int idx)
|
{
|
struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx];
|
struct ad714x_touchpad_drv *sw = &ad714x->sw->touchpad[idx];
|
|
sw->x_highest_stage = ad714x_cal_highest_stage(ad714x,
|
hw->x_start_stage, hw->x_end_stage);
|
sw->y_highest_stage = ad714x_cal_highest_stage(ad714x,
|
hw->y_start_stage, hw->y_end_stage);
|
|
dev_dbg(ad714x->dev,
|
"touchpad %d x_highest_stage:%d, y_highest_stage:%d\n",
|
idx, sw->x_highest_stage, sw->y_highest_stage);
|
}
|
|
/*
|
* If 2 fingers are touching the sensor then 2 peaks can be observed in the
|
* distribution.
|
* The arithmetic doesn't support to get absolute coordinates for multi-touch
|
* yet.
|
*/
|
static int touchpad_check_second_peak(struct ad714x_chip *ad714x, int idx)
|
{
|
struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx];
|
struct ad714x_touchpad_drv *sw = &ad714x->sw->touchpad[idx];
|
int i;
|
|
for (i = hw->x_start_stage; i < sw->x_highest_stage; i++) {
|
if ((ad714x->sensor_val[i] - ad714x->sensor_val[i + 1])
|
> (ad714x->sensor_val[i + 1] / 10))
|
return 1;
|
}
|
|
for (i = sw->x_highest_stage; i < hw->x_end_stage; i++) {
|
if ((ad714x->sensor_val[i + 1] - ad714x->sensor_val[i])
|
> (ad714x->sensor_val[i] / 10))
|
return 1;
|
}
|
|
for (i = hw->y_start_stage; i < sw->y_highest_stage; i++) {
|
if ((ad714x->sensor_val[i] - ad714x->sensor_val[i + 1])
|
> (ad714x->sensor_val[i + 1] / 10))
|
return 1;
|
}
|
|
for (i = sw->y_highest_stage; i < hw->y_end_stage; i++) {
|
if ((ad714x->sensor_val[i + 1] - ad714x->sensor_val[i])
|
> (ad714x->sensor_val[i] / 10))
|
return 1;
|
}
|
|
return 0;
|
}
|
|
/*
|
* If only one finger is used to activate the touch pad then only 1 peak will be
|
* registered in the distribution. This peak and the 2 adjacent sensors will be
|
* used in the calculation of the absolute position. This will prevent hand
|
* shadows to affect the absolute position calculation.
|
*/
|
static void touchpad_cal_abs_pos(struct ad714x_chip *ad714x, int idx)
|
{
|
struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx];
|
struct ad714x_touchpad_drv *sw = &ad714x->sw->touchpad[idx];
|
|
sw->x_abs_pos = ad714x_cal_abs_pos(ad714x, hw->x_start_stage,
|
hw->x_end_stage, sw->x_highest_stage, hw->x_max_coord);
|
sw->y_abs_pos = ad714x_cal_abs_pos(ad714x, hw->y_start_stage,
|
hw->y_end_stage, sw->y_highest_stage, hw->y_max_coord);
|
|
dev_dbg(ad714x->dev, "touchpad %d absolute position:(%d, %d)\n", idx,
|
sw->x_abs_pos, sw->y_abs_pos);
|
}
|
|
static void touchpad_cal_flt_pos(struct ad714x_chip *ad714x, int idx)
|
{
|
struct ad714x_touchpad_drv *sw = &ad714x->sw->touchpad[idx];
|
|
sw->x_flt_pos = (sw->x_flt_pos * (10 - 4) +
|
sw->x_abs_pos * 4)/10;
|
sw->y_flt_pos = (sw->y_flt_pos * (10 - 4) +
|
sw->y_abs_pos * 4)/10;
|
|
dev_dbg(ad714x->dev, "touchpad %d filter position:(%d, %d)\n",
|
idx, sw->x_flt_pos, sw->y_flt_pos);
|
}
|
|
/*
|
* To prevent distortion from showing in the absolute position, it is
|
* necessary to detect the end points. When endpoints are detected, the
|
* driver stops updating the status variables with absolute positions.
|
* End points are detected on the 4 edges of the touchpad sensor. The
|
* method to detect them is the same for all 4.
|
* To detect the end points, the firmware computes the difference in
|
* percent between the sensor on the edge and the adjacent one. The
|
* difference is calculated in percent in order to make the end point
|
* detection independent of the pressure.
|
*/
|
|
#define LEFT_END_POINT_DETECTION_LEVEL 550
|
#define RIGHT_END_POINT_DETECTION_LEVEL 750
|
#define LEFT_RIGHT_END_POINT_DEAVTIVALION_LEVEL 850
|
#define TOP_END_POINT_DETECTION_LEVEL 550
|
#define BOTTOM_END_POINT_DETECTION_LEVEL 950
|
#define TOP_BOTTOM_END_POINT_DEAVTIVALION_LEVEL 700
|
static int touchpad_check_endpoint(struct ad714x_chip *ad714x, int idx)
|
{
|
struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx];
|
struct ad714x_touchpad_drv *sw = &ad714x->sw->touchpad[idx];
|
int percent_sensor_diff;
|
|
/* left endpoint detect */
|
percent_sensor_diff = (ad714x->sensor_val[hw->x_start_stage] -
|
ad714x->sensor_val[hw->x_start_stage + 1]) * 100 /
|
ad714x->sensor_val[hw->x_start_stage + 1];
|
if (!sw->left_ep) {
|
if (percent_sensor_diff >= LEFT_END_POINT_DETECTION_LEVEL) {
|
sw->left_ep = 1;
|
sw->left_ep_val =
|
ad714x->sensor_val[hw->x_start_stage + 1];
|
}
|
} else {
|
if ((percent_sensor_diff < LEFT_END_POINT_DETECTION_LEVEL) &&
|
(ad714x->sensor_val[hw->x_start_stage + 1] >
|
LEFT_RIGHT_END_POINT_DEAVTIVALION_LEVEL + sw->left_ep_val))
|
sw->left_ep = 0;
|
}
|
|
/* right endpoint detect */
|
percent_sensor_diff = (ad714x->sensor_val[hw->x_end_stage] -
|
ad714x->sensor_val[hw->x_end_stage - 1]) * 100 /
|
ad714x->sensor_val[hw->x_end_stage - 1];
|
if (!sw->right_ep) {
|
if (percent_sensor_diff >= RIGHT_END_POINT_DETECTION_LEVEL) {
|
sw->right_ep = 1;
|
sw->right_ep_val =
|
ad714x->sensor_val[hw->x_end_stage - 1];
|
}
|
} else {
|
if ((percent_sensor_diff < RIGHT_END_POINT_DETECTION_LEVEL) &&
|
(ad714x->sensor_val[hw->x_end_stage - 1] >
|
LEFT_RIGHT_END_POINT_DEAVTIVALION_LEVEL + sw->right_ep_val))
|
sw->right_ep = 0;
|
}
|
|
/* top endpoint detect */
|
percent_sensor_diff = (ad714x->sensor_val[hw->y_start_stage] -
|
ad714x->sensor_val[hw->y_start_stage + 1]) * 100 /
|
ad714x->sensor_val[hw->y_start_stage + 1];
|
if (!sw->top_ep) {
|
if (percent_sensor_diff >= TOP_END_POINT_DETECTION_LEVEL) {
|
sw->top_ep = 1;
|
sw->top_ep_val =
|
ad714x->sensor_val[hw->y_start_stage + 1];
|
}
|
} else {
|
if ((percent_sensor_diff < TOP_END_POINT_DETECTION_LEVEL) &&
|
(ad714x->sensor_val[hw->y_start_stage + 1] >
|
TOP_BOTTOM_END_POINT_DEAVTIVALION_LEVEL + sw->top_ep_val))
|
sw->top_ep = 0;
|
}
|
|
/* bottom endpoint detect */
|
percent_sensor_diff = (ad714x->sensor_val[hw->y_end_stage] -
|
ad714x->sensor_val[hw->y_end_stage - 1]) * 100 /
|
ad714x->sensor_val[hw->y_end_stage - 1];
|
if (!sw->bottom_ep) {
|
if (percent_sensor_diff >= BOTTOM_END_POINT_DETECTION_LEVEL) {
|
sw->bottom_ep = 1;
|
sw->bottom_ep_val =
|
ad714x->sensor_val[hw->y_end_stage - 1];
|
}
|
} else {
|
if ((percent_sensor_diff < BOTTOM_END_POINT_DETECTION_LEVEL) &&
|
(ad714x->sensor_val[hw->y_end_stage - 1] >
|
TOP_BOTTOM_END_POINT_DEAVTIVALION_LEVEL + sw->bottom_ep_val))
|
sw->bottom_ep = 0;
|
}
|
|
return sw->left_ep || sw->right_ep || sw->top_ep || sw->bottom_ep;
|
}
|
|
static void touchpad_use_com_int(struct ad714x_chip *ad714x, int idx)
|
{
|
struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx];
|
|
ad714x_use_com_int(ad714x, hw->x_start_stage, hw->x_end_stage);
|
}
|
|
static void touchpad_use_thr_int(struct ad714x_chip *ad714x, int idx)
|
{
|
struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx];
|
|
ad714x_use_thr_int(ad714x, hw->x_start_stage, hw->x_end_stage);
|
ad714x_use_thr_int(ad714x, hw->y_start_stage, hw->y_end_stage);
|
}
|
|
static void ad714x_touchpad_state_machine(struct ad714x_chip *ad714x, int idx)
|
{
|
struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx];
|
struct ad714x_touchpad_drv *sw = &ad714x->sw->touchpad[idx];
|
unsigned short h_state, c_state;
|
unsigned short mask;
|
|
mask = (((1 << (hw->x_end_stage + 1)) - 1) -
|
((1 << hw->x_start_stage) - 1)) +
|
(((1 << (hw->y_end_stage + 1)) - 1) -
|
((1 << hw->y_start_stage) - 1));
|
|
h_state = ad714x->h_state & mask;
|
c_state = ad714x->c_state & mask;
|
|
switch (sw->state) {
|
case IDLE:
|
if (h_state) {
|
sw->state = JITTER;
|
/* In End of Conversion interrupt mode, the AD714X
|
* continuously generates hardware interrupts.
|
*/
|
touchpad_use_com_int(ad714x, idx);
|
dev_dbg(ad714x->dev, "touchpad %d touched\n", idx);
|
}
|
break;
|
|
case JITTER:
|
if (c_state == mask) {
|
touchpad_cal_sensor_val(ad714x, idx);
|
touchpad_cal_highest_stage(ad714x, idx);
|
if ((!touchpad_check_second_peak(ad714x, idx)) &&
|
(!touchpad_check_endpoint(ad714x, idx))) {
|
dev_dbg(ad714x->dev,
|
"touchpad%d, 2 fingers or endpoint\n",
|
idx);
|
touchpad_cal_abs_pos(ad714x, idx);
|
sw->x_flt_pos = sw->x_abs_pos;
|
sw->y_flt_pos = sw->y_abs_pos;
|
sw->state = ACTIVE;
|
}
|
}
|
break;
|
|
case ACTIVE:
|
if (c_state == mask) {
|
if (h_state) {
|
touchpad_cal_sensor_val(ad714x, idx);
|
touchpad_cal_highest_stage(ad714x, idx);
|
if ((!touchpad_check_second_peak(ad714x, idx))
|
&& (!touchpad_check_endpoint(ad714x, idx))) {
|
touchpad_cal_abs_pos(ad714x, idx);
|
touchpad_cal_flt_pos(ad714x, idx);
|
input_report_abs(sw->input, ABS_X,
|
sw->x_flt_pos);
|
input_report_abs(sw->input, ABS_Y,
|
sw->y_flt_pos);
|
input_report_key(sw->input, BTN_TOUCH,
|
1);
|
}
|
} else {
|
/* When the user lifts off the sensor, configure
|
* the AD714X back to threshold interrupt mode.
|
*/
|
touchpad_use_thr_int(ad714x, idx);
|
sw->state = IDLE;
|
input_report_key(sw->input, BTN_TOUCH, 0);
|
dev_dbg(ad714x->dev, "touchpad %d released\n",
|
idx);
|
}
|
input_sync(sw->input);
|
}
|
break;
|
|
default:
|
break;
|
}
|
}
|
|
static int ad714x_hw_detect(struct ad714x_chip *ad714x)
|
{
|
unsigned short data;
|
|
ad714x->read(ad714x, AD714X_PARTID_REG, &data, 1);
|
switch (data & 0xFFF0) {
|
case AD7142_PARTID:
|
ad714x->product = 0x7142;
|
ad714x->version = data & 0xF;
|
dev_info(ad714x->dev, "found AD7142 captouch, rev:%d\n",
|
ad714x->version);
|
return 0;
|
|
case AD7143_PARTID:
|
ad714x->product = 0x7143;
|
ad714x->version = data & 0xF;
|
dev_info(ad714x->dev, "found AD7143 captouch, rev:%d\n",
|
ad714x->version);
|
return 0;
|
|
case AD7147_PARTID:
|
ad714x->product = 0x7147;
|
ad714x->version = data & 0xF;
|
dev_info(ad714x->dev, "found AD7147(A) captouch, rev:%d\n",
|
ad714x->version);
|
return 0;
|
|
case AD7148_PARTID:
|
ad714x->product = 0x7148;
|
ad714x->version = data & 0xF;
|
dev_info(ad714x->dev, "found AD7148 captouch, rev:%d\n",
|
ad714x->version);
|
return 0;
|
|
default:
|
dev_err(ad714x->dev,
|
"fail to detect AD714X captouch, read ID is %04x\n",
|
data);
|
return -ENODEV;
|
}
|
}
|
|
static void ad714x_hw_init(struct ad714x_chip *ad714x)
|
{
|
int i, j;
|
unsigned short reg_base;
|
unsigned short data;
|
|
/* configuration CDC and interrupts */
|
|
for (i = 0; i < STAGE_NUM; i++) {
|
reg_base = AD714X_STAGECFG_REG + i * STAGE_CFGREG_NUM;
|
for (j = 0; j < STAGE_CFGREG_NUM; j++)
|
ad714x->write(ad714x, reg_base + j,
|
ad714x->hw->stage_cfg_reg[i][j]);
|
}
|
|
for (i = 0; i < SYS_CFGREG_NUM; i++)
|
ad714x->write(ad714x, AD714X_SYSCFG_REG + i,
|
ad714x->hw->sys_cfg_reg[i]);
|
for (i = 0; i < SYS_CFGREG_NUM; i++)
|
ad714x->read(ad714x, AD714X_SYSCFG_REG + i, &data, 1);
|
|
ad714x->write(ad714x, AD714X_STG_CAL_EN_REG, 0xFFF);
|
|
/* clear all interrupts */
|
ad714x->read(ad714x, STG_LOW_INT_STA_REG, &ad714x->l_state, 3);
|
}
|
|
static irqreturn_t ad714x_interrupt_thread(int irq, void *data)
|
{
|
struct ad714x_chip *ad714x = data;
|
int i;
|
|
mutex_lock(&ad714x->mutex);
|
|
ad714x->read(ad714x, STG_LOW_INT_STA_REG, &ad714x->l_state, 3);
|
|
for (i = 0; i < ad714x->hw->button_num; i++)
|
ad714x_button_state_machine(ad714x, i);
|
for (i = 0; i < ad714x->hw->slider_num; i++)
|
ad714x_slider_state_machine(ad714x, i);
|
for (i = 0; i < ad714x->hw->wheel_num; i++)
|
ad714x_wheel_state_machine(ad714x, i);
|
for (i = 0; i < ad714x->hw->touchpad_num; i++)
|
ad714x_touchpad_state_machine(ad714x, i);
|
|
mutex_unlock(&ad714x->mutex);
|
|
return IRQ_HANDLED;
|
}
|
|
struct ad714x_chip *ad714x_probe(struct device *dev, u16 bus_type, int irq,
|
ad714x_read_t read, ad714x_write_t write)
|
{
|
int i;
|
int error;
|
struct input_dev *input;
|
|
struct ad714x_platform_data *plat_data = dev_get_platdata(dev);
|
struct ad714x_chip *ad714x;
|
void *drv_mem;
|
unsigned long irqflags;
|
|
struct ad714x_button_drv *bt_drv;
|
struct ad714x_slider_drv *sd_drv;
|
struct ad714x_wheel_drv *wl_drv;
|
struct ad714x_touchpad_drv *tp_drv;
|
|
|
if (irq <= 0) {
|
dev_err(dev, "IRQ not configured!\n");
|
error = -EINVAL;
|
return ERR_PTR(error);
|
}
|
|
if (dev_get_platdata(dev) == NULL) {
|
dev_err(dev, "platform data for ad714x doesn't exist\n");
|
error = -EINVAL;
|
return ERR_PTR(error);
|
}
|
|
ad714x = devm_kzalloc(dev, sizeof(*ad714x) + sizeof(*ad714x->sw) +
|
sizeof(*sd_drv) * plat_data->slider_num +
|
sizeof(*wl_drv) * plat_data->wheel_num +
|
sizeof(*tp_drv) * plat_data->touchpad_num +
|
sizeof(*bt_drv) * plat_data->button_num,
|
GFP_KERNEL);
|
if (!ad714x) {
|
error = -ENOMEM;
|
return ERR_PTR(error);
|
}
|
ad714x->hw = plat_data;
|
|
drv_mem = ad714x + 1;
|
ad714x->sw = drv_mem;
|
drv_mem += sizeof(*ad714x->sw);
|
ad714x->sw->slider = sd_drv = drv_mem;
|
drv_mem += sizeof(*sd_drv) * ad714x->hw->slider_num;
|
ad714x->sw->wheel = wl_drv = drv_mem;
|
drv_mem += sizeof(*wl_drv) * ad714x->hw->wheel_num;
|
ad714x->sw->touchpad = tp_drv = drv_mem;
|
drv_mem += sizeof(*tp_drv) * ad714x->hw->touchpad_num;
|
ad714x->sw->button = bt_drv = drv_mem;
|
drv_mem += sizeof(*bt_drv) * ad714x->hw->button_num;
|
|
ad714x->read = read;
|
ad714x->write = write;
|
ad714x->irq = irq;
|
ad714x->dev = dev;
|
|
error = ad714x_hw_detect(ad714x);
|
if (error)
|
return ERR_PTR(error);
|
|
/* initialize and request sw/hw resources */
|
|
ad714x_hw_init(ad714x);
|
mutex_init(&ad714x->mutex);
|
|
/* a slider uses one input_dev instance */
|
if (ad714x->hw->slider_num > 0) {
|
struct ad714x_slider_plat *sd_plat = ad714x->hw->slider;
|
|
for (i = 0; i < ad714x->hw->slider_num; i++) {
|
input = devm_input_allocate_device(dev);
|
if (!input)
|
return ERR_PTR(-ENOMEM);
|
|
__set_bit(EV_ABS, input->evbit);
|
__set_bit(EV_KEY, input->evbit);
|
__set_bit(ABS_X, input->absbit);
|
__set_bit(BTN_TOUCH, input->keybit);
|
input_set_abs_params(input,
|
ABS_X, 0, sd_plat->max_coord, 0, 0);
|
|
input->id.bustype = bus_type;
|
input->id.product = ad714x->product;
|
input->id.version = ad714x->version;
|
input->name = "ad714x_captouch_slider";
|
input->dev.parent = dev;
|
|
error = input_register_device(input);
|
if (error)
|
return ERR_PTR(error);
|
|
sd_drv[i].input = input;
|
}
|
}
|
|
/* a wheel uses one input_dev instance */
|
if (ad714x->hw->wheel_num > 0) {
|
struct ad714x_wheel_plat *wl_plat = ad714x->hw->wheel;
|
|
for (i = 0; i < ad714x->hw->wheel_num; i++) {
|
input = devm_input_allocate_device(dev);
|
if (!input)
|
return ERR_PTR(-ENOMEM);
|
|
__set_bit(EV_KEY, input->evbit);
|
__set_bit(EV_ABS, input->evbit);
|
__set_bit(ABS_WHEEL, input->absbit);
|
__set_bit(BTN_TOUCH, input->keybit);
|
input_set_abs_params(input,
|
ABS_WHEEL, 0, wl_plat->max_coord, 0, 0);
|
|
input->id.bustype = bus_type;
|
input->id.product = ad714x->product;
|
input->id.version = ad714x->version;
|
input->name = "ad714x_captouch_wheel";
|
input->dev.parent = dev;
|
|
error = input_register_device(input);
|
if (error)
|
return ERR_PTR(error);
|
|
wl_drv[i].input = input;
|
}
|
}
|
|
/* a touchpad uses one input_dev instance */
|
if (ad714x->hw->touchpad_num > 0) {
|
struct ad714x_touchpad_plat *tp_plat = ad714x->hw->touchpad;
|
|
for (i = 0; i < ad714x->hw->touchpad_num; i++) {
|
input = devm_input_allocate_device(dev);
|
if (!input)
|
return ERR_PTR(-ENOMEM);
|
|
__set_bit(EV_ABS, input->evbit);
|
__set_bit(EV_KEY, input->evbit);
|
__set_bit(ABS_X, input->absbit);
|
__set_bit(ABS_Y, input->absbit);
|
__set_bit(BTN_TOUCH, input->keybit);
|
input_set_abs_params(input,
|
ABS_X, 0, tp_plat->x_max_coord, 0, 0);
|
input_set_abs_params(input,
|
ABS_Y, 0, tp_plat->y_max_coord, 0, 0);
|
|
input->id.bustype = bus_type;
|
input->id.product = ad714x->product;
|
input->id.version = ad714x->version;
|
input->name = "ad714x_captouch_pad";
|
input->dev.parent = dev;
|
|
error = input_register_device(input);
|
if (error)
|
return ERR_PTR(error);
|
|
tp_drv[i].input = input;
|
}
|
}
|
|
/* all buttons use one input node */
|
if (ad714x->hw->button_num > 0) {
|
struct ad714x_button_plat *bt_plat = ad714x->hw->button;
|
|
input = devm_input_allocate_device(dev);
|
if (!input) {
|
error = -ENOMEM;
|
return ERR_PTR(error);
|
}
|
|
__set_bit(EV_KEY, input->evbit);
|
for (i = 0; i < ad714x->hw->button_num; i++) {
|
bt_drv[i].input = input;
|
__set_bit(bt_plat[i].keycode, input->keybit);
|
}
|
|
input->id.bustype = bus_type;
|
input->id.product = ad714x->product;
|
input->id.version = ad714x->version;
|
input->name = "ad714x_captouch_button";
|
input->dev.parent = dev;
|
|
error = input_register_device(input);
|
if (error)
|
return ERR_PTR(error);
|
}
|
|
irqflags = plat_data->irqflags ?: IRQF_TRIGGER_FALLING;
|
irqflags |= IRQF_ONESHOT;
|
|
error = devm_request_threaded_irq(dev, ad714x->irq, NULL,
|
ad714x_interrupt_thread,
|
irqflags, "ad714x_captouch", ad714x);
|
if (error) {
|
dev_err(dev, "can't allocate irq %d\n", ad714x->irq);
|
return ERR_PTR(error);
|
}
|
|
return ad714x;
|
}
|
EXPORT_SYMBOL(ad714x_probe);
|
|
#ifdef CONFIG_PM
|
int ad714x_disable(struct ad714x_chip *ad714x)
|
{
|
unsigned short data;
|
|
dev_dbg(ad714x->dev, "%s enter\n", __func__);
|
|
mutex_lock(&ad714x->mutex);
|
|
data = ad714x->hw->sys_cfg_reg[AD714X_PWR_CTRL] | 0x3;
|
ad714x->write(ad714x, AD714X_PWR_CTRL, data);
|
|
mutex_unlock(&ad714x->mutex);
|
|
return 0;
|
}
|
EXPORT_SYMBOL(ad714x_disable);
|
|
int ad714x_enable(struct ad714x_chip *ad714x)
|
{
|
dev_dbg(ad714x->dev, "%s enter\n", __func__);
|
|
mutex_lock(&ad714x->mutex);
|
|
/* resume to non-shutdown mode */
|
|
ad714x->write(ad714x, AD714X_PWR_CTRL,
|
ad714x->hw->sys_cfg_reg[AD714X_PWR_CTRL]);
|
|
/* make sure the interrupt output line is not low level after resume,
|
* otherwise we will get no chance to enter falling-edge irq again
|
*/
|
|
ad714x->read(ad714x, STG_LOW_INT_STA_REG, &ad714x->l_state, 3);
|
|
mutex_unlock(&ad714x->mutex);
|
|
return 0;
|
}
|
EXPORT_SYMBOL(ad714x_enable);
|
#endif
|
|
MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor Driver");
|
MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
|
MODULE_LICENSE("GPL");
|
