/*
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*
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* FocalTech TouchScreen driver.
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*
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* Copyright (c) 2012-2019, FocalTech Systems, Ltd., all rights reserved.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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/*****************************************************************************
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*
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* File Name: focaltech_esdcheck.c
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*
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* Author: Focaltech Driver Team
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*
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* Created: 2016-08-03
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*
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* Abstract: ESD check function
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*
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* Version: v1.0
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*
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* Revision History:
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* v1.0:
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* First release. By luougojin 2016-08-03
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* v1.1: By luougojin 2017-02-15
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* 1. Add LCD_ESD_PATCH to control idc_esdcheck_lcderror
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*****************************************************************************/
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/*****************************************************************************
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* Included header files
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*****************************************************************************/
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#include "focaltech_core.h"
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#if FTS_ESDCHECK_EN
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/*****************************************************************************
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* Private constant and macro definitions using #define
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*****************************************************************************/
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#define ESDCHECK_WAIT_TIME 1000 /* ms */
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#define LCD_ESD_PATCH 0
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#define ESDCHECK_INTRCNT_MAX 2
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/*****************************************************************************
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* Private enumerations, structures and unions using typedef
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*****************************************************************************/
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struct fts_esdcheck_st {
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u8 mode : 1; /* 1- need check esd 0- no esd check */
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u8 suspend : 1;
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u8 proc_debug : 1; /* apk or adb use */
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u8 intr : 1; /* 1- Interrupt trigger */
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u8 unused : 4;
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u8 intr_cnt;
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u8 flow_work_hold_cnt; /* Flow Work Cnt(reg0x91) keep a same value for x times. >=5 times is ESD, need reset */
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u8 flow_work_cnt_last; /* Save Flow Work Cnt(reg0x91) value */
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u32 hardware_reset_cnt;
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u32 nack_cnt;
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u32 dataerror_cnt;
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};
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/*****************************************************************************
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* Static variables
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*****************************************************************************/
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static struct fts_esdcheck_st fts_esdcheck_data;
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/*****************************************************************************
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* Global variable or extern global variabls/functions
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*****************************************************************************/
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/*****************************************************************************
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* Static function prototypes
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*****************************************************************************/
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/*****************************************************************************
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* functions body
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*****************************************************************************/
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#if LCD_ESD_PATCH
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int lcd_need_reset;
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static int tp_need_recovery; /* LCD reset cause Tp reset */
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int idc_esdcheck_lcderror(struct fts_ts_data *ts_data)
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{
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int ret = 0;
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u8 val = 0;
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FTS_DEBUG("check LCD ESD");
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if ( (tp_need_recovery == 1) && (lcd_need_reset == 0) ) {
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tp_need_recovery = 0;
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/* LCD reset, need recover TP state */
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fts_release_all_finger();
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fts_tp_state_recovery(ts_data);
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}
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ret = fts_read_reg(FTS_REG_ESD_SATURATE, &val);
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if ( ret < 0) {
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FTS_ERROR("read reg0xED fail,ret:%d", ret);
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return -EIO;
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}
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if (val == 0xAA) {
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/*
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* 1. Set flag lcd_need_reset = 1;
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* 2. LCD driver need reset(recovery) LCD and set lcd_need_reset to 0
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* 3. recover TP state
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*/
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FTS_INFO("LCD ESD, need execute LCD reset");
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lcd_need_reset = 1;
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tp_need_recovery = 1;
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}
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return 0;
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}
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#endif
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static int fts_esdcheck_tp_reset(struct fts_ts_data *ts_data)
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{
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FTS_FUNC_ENTER();
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fts_esdcheck_data.flow_work_hold_cnt = 0;
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fts_esdcheck_data.hardware_reset_cnt++;
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fts_reset_proc(200);
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fts_release_all_finger();
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fts_tp_state_recovery(ts_data);
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FTS_FUNC_EXIT();
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return 0;
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}
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static bool get_chip_id(struct fts_ts_data *ts_data)
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{
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int ret = 0;
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int i = 0;
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u8 reg_value = 0;
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u8 reg_addr = 0;
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u8 chip_id = ts_data->ic_info.ids.chip_idh;
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for (i = 0; i < 3; i++) {
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reg_addr = FTS_REG_CHIP_ID;
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ret = fts_read(®_addr, 1, ®_value, 1);
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if (ret < 0) {
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FTS_ERROR("read chip id fail,ret:%d", ret);
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fts_esdcheck_data.nack_cnt++;
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} else {
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if (reg_value == chip_id) {
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break;
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} else {
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FTS_DEBUG("read chip_id:%x,retry:%d", reg_value, i);
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fts_esdcheck_data.dataerror_cnt++;
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}
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}
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msleep(10);
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}
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/* if can't get correct data in 3 times, then need hardware reset */
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if (i >= 3) {
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FTS_ERROR("read chip id 3 times fail, need execute TP reset");
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return true;
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}
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return false;
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}
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/*****************************************************************************
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* Name: get_flow_cnt
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* Brief: Read flow cnt(0x91)
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* Input:
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* Output:
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* Return: 1(true) - Reg 0x91(flow cnt) abnormal: hold a value for 5 times
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* 0(false) - Reg 0x91(flow cnt) normal
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*****************************************************************************/
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static bool get_flow_cnt(struct fts_ts_data *ts_data)
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{
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int ret = 0;
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u8 reg_value = 0;
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u8 reg_addr = 0;
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reg_addr = FTS_REG_FLOW_WORK_CNT;
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ret = fts_read(®_addr, 1, ®_value, 1);
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if (ret < 0) {
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FTS_ERROR("read reg0x91 fail,ret:%d", ret);
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fts_esdcheck_data.nack_cnt++;
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} else {
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if ( reg_value == fts_esdcheck_data.flow_work_cnt_last ) {
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FTS_DEBUG("reg0x91,val:%x,last:%x", reg_value,
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fts_esdcheck_data.flow_work_cnt_last);
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fts_esdcheck_data.flow_work_hold_cnt++;
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} else {
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fts_esdcheck_data.flow_work_hold_cnt = 0;
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}
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fts_esdcheck_data.flow_work_cnt_last = reg_value;
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}
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/* Flow Work Cnt keep a value for 5 times, need execute TP reset */
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if (fts_esdcheck_data.flow_work_hold_cnt >= 5) {
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FTS_DEBUG("reg0x91 keep a value for 5 times, need execute TP reset");
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return true;
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}
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return false;
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}
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static int esdcheck_algorithm(struct fts_ts_data *ts_data)
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{
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int ret = 0;
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u8 reg_value = 0;
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u8 reg_addr = 0;
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bool hardware_reset = 0;
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/* 1. esdcheck is interrupt, then return */
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if (fts_esdcheck_data.intr == 1) {
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fts_esdcheck_data.intr_cnt++;
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if (fts_esdcheck_data.intr_cnt > ESDCHECK_INTRCNT_MAX)
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fts_esdcheck_data.intr = 0;
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else
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return 0;
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}
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/* 2. check power state, if suspend, no need check esd */
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if (fts_esdcheck_data.suspend == 1) {
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FTS_DEBUG("In suspend, not check esd");
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/* because in suspend state, adb can be used, when upgrade FW, will
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* active ESD check(active = 1); But in suspend, then will don't
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* queue_delayed_work, when resume, don't check ESD again
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*/
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return 0;
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}
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/* 3. check fts_esdcheck_data.proc_debug state, if 1-proc busy, no need check esd*/
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if (fts_esdcheck_data.proc_debug == 1) {
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FTS_INFO("In apk/adb command mode, not check esd");
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return 0;
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}
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/* 4. In factory mode, can't check esd */
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reg_addr = FTS_REG_WORKMODE;
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ret = fts_read_reg(reg_addr, ®_value);
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if ( ret < 0 ) {
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fts_esdcheck_data.nack_cnt++;
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} else if ( (reg_value & 0x70) != FTS_REG_WORKMODE_WORK_VALUE) {
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FTS_DEBUG("not in work mode(%x), no check esd", reg_value);
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return 0;
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}
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/* 5. IDC esd check lcd default:close */
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#if LCD_ESD_PATCH
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idc_esdcheck_lcderror(ts_data);
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#endif
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/* 6. Get Chip ID */
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hardware_reset = get_chip_id(ts_data);
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/* 7. get Flow work cnt: 0x91 If no change for 5 times, then ESD and reset */
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if (!hardware_reset) {
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hardware_reset = get_flow_cnt(ts_data);
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}
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/* 8. If need hardware reset, then handle it here */
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if (hardware_reset == 1) {
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FTS_DEBUG("NoACK=%d, Error Data=%d, Hardware Reset=%d",
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fts_esdcheck_data.nack_cnt,
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fts_esdcheck_data.dataerror_cnt,
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fts_esdcheck_data.hardware_reset_cnt);
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fts_esdcheck_tp_reset(ts_data);
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}
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return 0;
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}
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static void esdcheck_func(struct work_struct *work)
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{
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struct fts_ts_data *ts_data = container_of(work,
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struct fts_ts_data, esdcheck_work.work);
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if (ENABLE == fts_esdcheck_data.mode) {
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esdcheck_algorithm(ts_data);
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queue_delayed_work(ts_data->ts_workqueue, &ts_data->esdcheck_work,
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msecs_to_jiffies(ESDCHECK_WAIT_TIME));
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}
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}
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int fts_esdcheck_set_intr(bool intr)
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{
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/* interrupt don't add debug message */
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fts_esdcheck_data.intr = intr;
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fts_esdcheck_data.intr_cnt = (u8)intr;
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return 0;
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}
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static int fts_esdcheck_get_status(void)
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{
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/* interrupt don't add debug message */
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return fts_esdcheck_data.mode;
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}
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/*****************************************************************************
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* Name: fts_esdcheck_proc_busy
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* Brief: When APK or ADB command access TP via driver, then need set proc_debug,
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* then will not check ESD.
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* Input:
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* Output:
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* Return:
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*****************************************************************************/
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int fts_esdcheck_proc_busy(bool proc_debug)
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{
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fts_esdcheck_data.proc_debug = proc_debug;
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return 0;
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}
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/*****************************************************************************
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* Name: fts_esdcheck_switch
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* Brief: FTS esd check function switch.
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* Input: enable: 1 - Enable esd check
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* 0 - Disable esd check
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* Output:
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* Return:
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*****************************************************************************/
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int fts_esdcheck_switch(bool enable)
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{
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struct fts_ts_data *ts_data = fts_data;
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FTS_FUNC_ENTER();
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if (fts_esdcheck_data.mode == ENABLE) {
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if (enable) {
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FTS_DEBUG("ESD check start");
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fts_esdcheck_data.flow_work_hold_cnt = 0;
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fts_esdcheck_data.flow_work_cnt_last = 0;
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fts_esdcheck_data.intr = 0;
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fts_esdcheck_data.intr_cnt = 0;
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queue_delayed_work(ts_data->ts_workqueue,
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&ts_data->esdcheck_work,
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msecs_to_jiffies(ESDCHECK_WAIT_TIME));
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} else {
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FTS_DEBUG("ESD check stop");
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cancel_delayed_work_sync(&ts_data->esdcheck_work);
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}
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}
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FTS_FUNC_EXIT();
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return 0;
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}
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int fts_esdcheck_suspend(void)
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{
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FTS_FUNC_ENTER();
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fts_esdcheck_switch(DISABLE);
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fts_esdcheck_data.suspend = 1;
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fts_esdcheck_data.intr = 0;
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fts_esdcheck_data.intr_cnt = 0;
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FTS_FUNC_EXIT();
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return 0;
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}
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int fts_esdcheck_resume( void )
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{
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FTS_FUNC_ENTER();
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fts_esdcheck_switch(ENABLE);
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fts_esdcheck_data.suspend = 0;
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fts_esdcheck_data.intr = 0;
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fts_esdcheck_data.intr_cnt = 0;
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FTS_FUNC_EXIT();
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return 0;
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}
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static ssize_t fts_esdcheck_store(
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struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct input_dev *input_dev = fts_data->input_dev;
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mutex_lock(&input_dev->mutex);
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if (FTS_SYSFS_ECHO_ON(buf)) {
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FTS_DEBUG("enable esdcheck");
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fts_esdcheck_data.mode = ENABLE;
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fts_esdcheck_switch(ENABLE);
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} else if (FTS_SYSFS_ECHO_OFF(buf)) {
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FTS_DEBUG("disable esdcheck");
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fts_esdcheck_switch(DISABLE);
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fts_esdcheck_data.mode = DISABLE;
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}
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mutex_unlock(&input_dev->mutex);
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return count;
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}
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static ssize_t fts_esdcheck_show(
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struct device *dev, struct device_attribute *attr, char *buf)
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{
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int count;
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struct input_dev *input_dev = fts_data->input_dev;
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mutex_lock(&input_dev->mutex);
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count = snprintf(buf, PAGE_SIZE, "Esd check: %s\n", \
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fts_esdcheck_get_status() ? "On" : "Off");
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mutex_unlock(&input_dev->mutex);
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return count;
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}
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/* sysfs esd node
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* read example: cat fts_esd_mode ---read esd mode
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* write example:echo 01 > fts_esd_mode ---make esdcheck enable
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*
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*/
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static DEVICE_ATTR (fts_esd_mode, S_IRUGO | S_IWUSR, fts_esdcheck_show, fts_esdcheck_store);
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static struct attribute *fts_esd_mode_attrs[] = {
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&dev_attr_fts_esd_mode.attr,
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NULL,
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};
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static struct attribute_group fts_esd_group = {
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.attrs = fts_esd_mode_attrs,
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};
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int fts_create_esd_sysfs(struct device *dev)
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{
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int ret = 0;
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ret = sysfs_create_group(&dev->kobj, &fts_esd_group);
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if ( ret != 0) {
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FTS_ERROR("fts_create_esd_sysfs(sysfs) create fail");
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sysfs_remove_group(&dev->kobj, &fts_esd_group);
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return ret;
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}
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return 0;
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}
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int fts_esdcheck_init(struct fts_ts_data *ts_data)
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{
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FTS_FUNC_ENTER();
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if (ts_data->ts_workqueue) {
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INIT_DELAYED_WORK(&ts_data->esdcheck_work, esdcheck_func);
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} else {
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FTS_ERROR("fts workqueue is NULL, can't run esd check function");
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return -EINVAL;
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}
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memset((u8 *)&fts_esdcheck_data, 0, sizeof(struct fts_esdcheck_st));
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fts_esdcheck_data.mode = ENABLE;
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fts_esdcheck_data.intr = 0;
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fts_esdcheck_data.intr_cnt = 0;
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fts_esdcheck_switch(ENABLE);
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fts_create_esd_sysfs(ts_data->dev);
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FTS_FUNC_EXIT();
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return 0;
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}
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int fts_esdcheck_exit(struct fts_ts_data *ts_data)
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{
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sysfs_remove_group(&ts_data->dev->kobj, &fts_esd_group);
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return 0;
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}
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#endif /* FTS_ESDCHECK_EN */
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