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Release 4.11 drivers/input/misc/ad714x.c

/*
 * AD714X CapTouch Programmable Controller driver supporting AD7142/3/7/8/7A
 *
 * Copyright 2009-2011 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#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); }

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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); }

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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; }

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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; }

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/* * 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; } }

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/* * 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]); } }

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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); }

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/* * 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); }

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/* * 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); }

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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); }

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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); }

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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; } }

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/* * 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); }

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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; } }

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/* * 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; }

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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; }

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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); }

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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); }

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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; } }

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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; } }

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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); }

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/* * 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; }

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/* * 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); }

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Bryan Wu113100.00%1100.00%
Total113100.00%1100.00%


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); }

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PersonTokensPropCommitsCommitProp
Bryan Wu96100.00%1100.00%
Total96100.00%1100.00%

/* * 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; }

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PersonTokensPropCommitsCommitProp
Bryan Wu512100.00%1100.00%
Total512100.00%1100.00%


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); }

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PersonTokensPropCommitsCommitProp
Bryan Wu42100.00%1100.00%
Total42100.00%1100.00%


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); }

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Bryan Wu55100.00%1100.00%
Total55100.00%1100.00%


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; } }

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Bryan Wu420100.00%1100.00%
Total420100.00%1100.00%


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; } }

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Bryan Wu11361.08%133.33%
Barry Song7037.84%133.33%
Michael Hennerich21.08%133.33%
Total185100.00%3100.00%


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); }

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Bryan Wu17097.70%150.00%
Michael Hennerich42.30%150.00%
Total174100.00%2100.00%


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; }

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Bryan Wu15399.35%150.00%
Michael Hennerich10.65%150.00%
Total154100.00%2100.00%


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; }

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PersonTokensPropCommitsCommitProp
Bryan Wu98983.32%114.29%
Vaishali Thakkar1179.86%114.29%
Michael Hennerich574.80%228.57%
Lars-Peter Clausen171.43%114.29%
Jingoo Han60.51%114.29%
Uwe Kleine-König10.08%114.29%
Total1187100.00%7100.00%

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; }

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Bryan Wu68100.00%1100.00%
Total68100.00%1100.00%

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; }

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PersonTokensPropCommitsCommitProp
Bryan Wu7497.37%150.00%
Michael Hennerich22.63%150.00%
Total76100.00%2100.00%

EXPORT_SYMBOL(ad714x_enable); #endif MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor Driver"); MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu606893.30%18.33%
Michael Hennerich2113.24%541.67%
Vaishali Thakkar1181.81%18.33%
Barry Song801.23%18.33%
Lars-Peter Clausen170.26%18.33%
Jingoo Han60.09%18.33%
Paul Gortmaker30.05%18.33%
Uwe Kleine-König10.02%18.33%
Total6504100.00%12100.00%
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