#include <linux/kernel.h>#include <linux/module.h>#include <linux/time.h>#include <linux/delay.h>#include <linux/device.h>#include <linux/earlysuspend.h>#include <linux/hrtimer.h>#include <linux/i2c.h>#include <linux/input.h>#include <linux/interrupt.h>#include <linux/io.h>#include <linux/platform_device.h>#include <linux/slab.h>#include <mach/gpio.h>#include <plat/gpio-cfg.h>#include <linux/irq.h>#include <linux/goodix_touch.h>#include <linux/goodix_queue.h>#ifndef GUITAR_SMALL#error The code does not match the hardware version.#endifstatic struct workqueue_struct *goodix_wq;/*********************************************管理当前手指状态的伪队列，对当前手指根据时间顺序排序*适用于Guitar小屏*/static struct point_queue finger_list;//record the fingers list /*************************************************/const char *s3c_ts_name = "Goodix_TouchScreen";struct i2c_client * i2c_connect_client = NULL;EXPORT_SYMBOL(i2c_connect_client);#ifdef CONFIG_HAS_EARLYSUSPENDstatic void goodix_ts_early_suspend(struct early_suspend *h);static void goodix_ts_late_resume(struct early_suspend *h);#endif/*******************************************************功能：读取从机数据每个读操作用两条i2c_msg组成，第1条消息用于发送从机地址，第2条用于发送读取地址和取回数据；每条消息前发送起始信号参数：client:i2c设备，包含设备地址buf[0]：首字节为读取地址buf[1]~buf[len]：数据缓冲区len：读取数据长度return：执行消息数*********************************************************//*Function as i2c_master_send */static int i2c_read_bytes(struct i2c_client *client, uint8_t *buf, int len){struct i2c_msg msgs[2];int ret=-1;//发送写地址msgs[0].flags=!I2C_M_RD;//写消息msgs[0].addr=client->addr;msgs[0].len=1;msgs[0].buf=&buf[0];//接收数据msgs[1].flags=I2C_M_RD;//读消息msgs[1].addr=client->addr;msgs[1].len=len-1;msgs[1].buf=&buf[1];ret=i2c_transfer(client->adapter,msgs,2);return ret;}/*******************************************************功能：向从机写数据参数：client:i2c设备，包含设备地址buf[0]：首字节为写地址buf[1]~buf[len]：数据缓冲区len：数据长度return：执行消息数*******************************************************//*Function as i2c_master_send */static int i2c_write_bytes(struct i2c_client *client,uint8_t *data,int len){struct i2c_msg msg;int ret=-1;//发送设备地址msg.flags=!I2C_M_RD;//写消息msg.addr=client->addr;msg.len=len;msg.buf=data;ret=i2c_transfer(client->adapter,&msg,1);return ret;}/*******************************************************功能：Guitar初始化函数，用于发送配置信息，获取版本信息参数：ts:client私有数据结构体return：执行结果码，0表示正常执行*******************************************************/static int goodix_init_panel(struct goodix_ts_data *ts){int ret=-1;//#define GUITAR_CONFIG_43#ifdef GUITAR_CONFIG_43uint8_t config_info[54]={0x30,0x19,0x05,0x06,0x28,0x02,0x14,0x14,0x10,0x28,0xB0,0x14,0x00,0x1E,0x00,0x01,0x23,0x45,0x67,0x89,0xAB,0xCD,0xE1,0x00,0x00,0x00,0x00,0x1D,0xCF,0x20,0x0B,0x0B,0x8B, 0x50,0x3C,0x1E,0x28,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x01};#else //TCL_5.0 inchuint8_t config_info[54]={0x30,0x19,0x05,0x05,0x28,0x02,0x14,0x14,0x10,0x32,0xF8,0x14,0x00,0x1E,0x00,0xED,0xCB,0xA9,0x87,0x65,0x43,0x21,0x01,0x00,0x00,0x35,0x2E,0x4D,0xC0,0x20,0x01,0x01,0x83,0x50,0x3C,0x1E,0x28,0x00,0x33,0x2C,0x01,0xEC,0x00,0x3C,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01};#endif ret=i2c_write_bytes(ts->client,config_info,54);if (ret < 0) goto error_i2c_transfer;msleep(1);return 0;error_i2c_transfer:return ret;}static int goodix_read_version(struct goodix_ts_data *ts){int ret;uint8_t version[2]={0x69,0xff};//command of reading Guitar's version uint8_t version_data[41];//store touchscreen version infomationmemset(version_data, 0 , sizeof(version_data));version_data[0]=0x6A;ret=i2c_write_bytes(ts->client,version,2);if (ret < 0) goto error_i2c_version;msleep(16);ret=i2c_read_bytes(ts->client,version_data, 40);if (ret < 0) goto error_i2c_version;dev_info(&ts->client->dev," Guitar Version: %s\n", &version_data[1]);//hcj: for debugprintk(KERN_INFO " Guitar Version: %s\n", &version_data[1]);version[1] = 0x00;//cancel the commandi2c_write_bytes(ts->client, version, 2);return 0;error_i2c_version:return ret;}/*******************************************************功能：触摸屏工作函数由中断触发，接受1组坐标数据，校验后再分析输出参数：ts:client私有数据结构体return：执行结果码，0表示正常执行********************************************************/static void goodix_ts_work_func(struct work_struct *work){uint8_t point_data[35]={ 0 };static uint8_t finger_bit=0;uint8_t finger=0;int ret=-1;unsigned int pressure[MAX_FINGER_NUM];int pos[MAX_FINGER_NUM][2];int position =0;int count = 0, read_position = 0;int check_sum = 0;struct goodix_ts_data *ts = container_of(work, struct goodix_ts_data, work);if (gpio_get_value(SHUTDOWN_PORT)){//printk(KERN_ALERT "Guitar stop working.The data is invalid. \n");goto NO_ACTION;}start_read_i2c://if i2c transfer is failed, let it restart less than 10 timesif( ts->retry > 9) {if(!ts->use_irq)//ts->timer.state = HRTIMER_STATE_INACTIVE;hrtimer_cancel(&ts->timer);dev_info(&(ts->client->dev), "Because of transfer error, Guitar's driver stop working.\n");return ;}if(ts->bad_data) msleep(16);ret=i2c_read_bytes(ts->client, point_data, 35);if(ret <= 0){dev_err(&(ts->client->dev),"I2C transfer error. Number:%d\n ", ret);ts->bad_data = 1;ts->retry++;goodix_init_panel(ts);goto start_read_i2c;}ts->bad_data = 0; //The bit indicate which fingers pressed down/*switch(point_data[1]& 0x1f){case 0:case 1:*/for(count=1; count<8; count++)check_sum += (int)point_data[count];if((check_sum%256) != point_data[8])//goto XFER_ERROR;/*break;case 2:case 3:for(count=1; count<13;count++)check_sum += (int)point_data[count];if((check_sum%256) != point_data[13])goto XFER_ERROR;break;default://(point_data[1]& 0x1f) > 3for(count=1; count<34;count++)check_sum += (int)point_data[count];if((check_sum%256) != point_data[34])goto XFER_ERROR;}*/point_data[1]&=0x1f;finger = finger_bit^point_data[1];if(finger == 0 && point_data[1] == 0)goto NO_ACTION;//no fingers and no actionelse if(finger == 0)//the same as last timegoto BIT_NO_CHANGE;//check which point(s) DOWN or UPfor(position = 0; (finger !=0)&& (position < MAX_FINGER_NUM); position++){if((finger&0x01) == 1)//current bit is 1?{//NO.postion finger is changeif(((finger_bit>>position)&0x01)==1)//NO.postion finger is UPset_up_point(&finger_list, position);else add_point(&finger_list, position);}finger>>=1;}BIT_NO_CHANGE: count = 0;//for(count = 0; count < finger_list.length; count++)//{if(finger_list.pointer[count].state == FLAG_UP){pos[count][0] = pos[count][1] = 0;pressure[count] = 0;//continue;}if(finger_list.pointer[count].num < 3)read_position = finger_list.pointer[count].num*5 + 3;else if (finger_list.pointer[count].num == 4)read_position = 29;if(finger_list.pointer[count].num != 3){pos[count][0] = (unsigned int) (point_data[read_position]<<8) + (unsigned int)( point_data[read_position+1]);pos[count][1] = (unsigned int)(point_data[read_position+2]<<8) + (unsigned int) (point_data[read_position+3]);pressure[count] = (unsigned int) (point_data[read_position+4]);}else {pos[count][0] = (unsigned int) (point_data[18]<<8) + (unsigned int)( point_data[25]);pos[count][1] = (unsigned int)(point_data[26]<<8) + (unsigned int) (point_data[27]);pressure[count] = (unsigned int) (point_data[28]);}#ifdef GOODIX_TS_DEBUGif(count == 3)dev_info(&(ts->client->dev), "Original data: Count:%d Index:%d X:%d Y:%d\n",count, finger_list.pointer[count].num, pos[count][0], pos[count][1]);#endif// 系统坐标的特点是：左上角为原点（LAN所在边为上方）,横向为X轴，纵向为Y轴. //pos[count][0] = pos[count][0]*SCREEN_MAX_WIDTH*9/(TOUCH_MAX_WIDTH*5);pos[count][0] = (TOUCH_MAX_WIDTH - pos[count][0])*SCREEN_MAX_WIDTH/TOUCH_MAX_WIDTH;//y, 且取中线的对称点(原点切换)pos[count][1]= pos[count][1]*SCREEN_MAX_HEIGHT/TOUCH_MAX_HEIGHT ; //x,swap(pos[count][0] ,pos[count][1]); #ifdef GOODIX_TS_DEBUGif(count == 3)dev_info(&(ts->client->dev), " Coordinate: Count:%d Index:%d X:%d Y:%d\n",count, finger_list.pointer[count].num, pos[count][0], pos[count][1]);#endif//}//if(finger_list.length > 0 && finger_list.pointer[0].state == FLAG_DOWN)if( finger_list.pointer[0].state == FLAG_DOWN){input_report_abs(ts->input_dev, ABS_X,800- pos[0][0]);input_report_abs(ts->input_dev, ABS_Y, pos[0][1]);input_report_abs(ts->input_dev, ABS_PRESSURE, pressure[0]);input_report_key(ts->input_dev, BTN_TOUCH, finger_list.pointer[0].state); }#ifdef GOODIX_MULTI_TOUCH/*if(finger_list.length > 0 && finger_list.pointer[0].state == FLAG_DOWN){input_report_abs(ts->input_dev, ABS_MT_POSITION_X, (800 - pos[0][0]));input_report_abs(ts->input_dev, ABS_MT_POSITION_Y, pos[0][1]);}input_report_abs(ts->input_dev, ABS_MT_PRESSURE, pressure[0]);input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, pressure[0]);input_mt_sync(ts->input_dev);*//*for(count = 1; count < MAX_FINGER_NUM; count++){if (finger_list.length > count){if(finger_list.pointer[count].state == FLAG_DOWN){input_report_abs(ts->input_dev, ABS_MT_POSITION_X, (800 -pos[count][0]));input_report_abs(ts->input_dev, ABS_MT_POSITION_Y, pos[count][1]);} input_report_abs(ts->input_dev, ABS_MT_PRESSURE, pressure[count]);input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, pressure[count]);input_mt_sync(ts->input_dev);}}*/#endifinput_sync(ts->input_dev);//#ifdef GOODIX_DEBUG#ifdef GOODIX_TS_DEBUGif((finger_bit^point_data[1]) != 0){for(count = 0; count < finger_list.length; count++)printk(KERN_INFO "Index:%d, No:%d, State:%d\n", count, finger_list.pointer[count].num, finger_list.pointer[count].state); printk(KERN_INFO "\n");}#endifdel_point(&finger_list);finger_bit=point_data[1];XFER_ERROR:NO_ACTION:count = 0;}/*******************************************************功能：计时器响应函数由计时器触发，调度触摸屏工作函数运行；之后重新计时参数：timer：函数关联的计时器return：计时器工作模式，HRTIMER_NORESTART表示不需要自动重启********************************************************/static enum hrtimer_restart goodix_ts_timer_func(struct hrtimer *timer){struct goodix_ts_data *ts = container_of(timer, struct goodix_ts_data, timer);queue_work(goodix_wq, &ts->work);hrtimer_start(&ts->timer, ktime_set(0, 16000000), HRTIMER_MODE_REL);return HRTIMER_NORESTART;}/*******************************************************功能：中断响应函数由中断触发，调度触摸屏处理函数运行参数：timer：函数关联的计时器return：计时器工作模式，HRTIMER_NORESTART表示不需要自动重启********************************************************/static irqreturn_t goodix_ts_irq_handler(int irq, void *dev_id){struct goodix_ts_data *ts = dev_id;/* hcj: for debug *///printk(KERN_CRIT "interrupt for guitar arrived.\n");queue_work(goodix_wq, &ts->work);return IRQ_HANDLED;}/*******************************************************功能：触摸屏探测函数在注册驱动时调用（要求存在对应的client）；用于IO,中断等资源申请；设备注册；触摸屏初始化等工作参数：client：待驱动的设备结构体id：设备IDreturn：执行结果码，0表示正常执行********************************************************/static int goodix_ts_probe(struct i2c_client *client, const struct i2c_device_id *id){struct goodix_ts_data *ts;int ret = 0;int retry=0;int count=0;struct goodix_i2c_rmi_platform_data *pdata;dev_dbg(&client->dev,"Install touchscreen driver for guitar.\n");/* hcj: for debug guitar */printk(KERN_INFO "Install touchscreen driver for guitar.\n");//Check I2C functionret = gpio_request(SHUTDOWN_PORT, "TS_SHUTDOWN");//Request IOif (ret < 0) {printk(KERN_ALERT "Failed to request GPIO:%d, ERRNO:%d\n",(int)SHUTDOWN_PORT,ret);goto err_check_functionality_failed;}gpio_direction_output(SHUTDOWN_PORT, 0);//Touchscreen is waiting to wakeupret = gpio_get_value(SHUTDOWN_PORT);if (ret){printk(KERN_ALERT "Cannot set touchscreen to work.\n");goto err_check_functionality_failed;}//waite guitar startif (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {dev_err(&client->dev, "System need I2C function.\n");ret = -ENODEV;goto err_check_functionality_failed;}i2c_connect_client = client;//used by Guitar Updating.msleep(16);for(retry=0; retry < 5; retry++){ret =i2c_write_bytes(client, NULL, 0);//Test i2c.if (ret > 0)break;}if(ret < 0){dev_err(&client->dev, "Warnning: I2C connection might be something wrong!\n");ret = -ENOSYS;goto err_i2c_failed;}gpio_set_value(SHUTDOWN_PORT, 1);//suspendts = kzalloc(sizeof(*ts), GFP_KERNEL);if (ts == NULL) {ret = -ENOMEM;goto err_alloc_data_failed;}INIT_WORK(&ts->work, goodix_ts_work_func);ts->client = client;i2c_set_clientdata(client, ts);pdata = client->dev.platform_data;ts->input_dev = input_allocate_device();if (ts->input_dev == NULL) {ret = -ENOMEM;dev_dbg(&client->dev," In File:%s Function:%s Failed to allocate input device\n", __FILE__, __func__);goto err_input_dev_alloc_failed;}ts->input_dev->evbit[0] = BIT_MASK(EV_SYN) | BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) ;ts->input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);ts->input_dev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y); // for android//#ifdef GOODIX_MULTI_TOUCH//used by android 1.x for multi-touch, not realized//ts->input_dev->absbit[0]=BIT(ABS_HAT0X) |BIT(ABS_HAT0Y);//ts->input_dev->keybit[BIT_WORD(BTN_2)] = BIT_MASK(BTN_2);//#endifinput_set_abs_params(ts->input_dev, ABS_X, 0, SCREEN_MAX_HEIGHT, 0, 0);input_set_abs_params(ts->input_dev, ABS_Y, 0, SCREEN_MAX_WIDTH, 0, 0);input_set_abs_params(ts->input_dev, ABS_PRESSURE, 0, 255, 0, 0);/*#ifdef GOODIX_MULTI_TOUCHinput_set_abs_params(ts->input_dev, ABS_MT_PRESSURE, 0, 255, 0, 0);input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);input_set_abs_params(ts->input_dev, ABS_MT_POSITION_X, 0, SCREEN_MAX_HEIGHT, 0, 0);input_set_abs_params(ts->input_dev, ABS_MT_POSITION_Y, 0, SCREEN_MAX_WIDTH, 0, 0);#endif*/sprintf(ts->phys, "input/ts)");ts->input_dev->name = s3c_ts_name;ts->input_dev->phys = ts->phys;ts->input_dev->id.bustype = BUS_I2C;ts->input_dev->id.vendor = 0xDEAD;ts->input_dev->id.product = 0xBEEF;ts->input_dev->id.version = 10427;finger_list.length = 0;ret = input_register_device(ts->input_dev);if (ret) {dev_err(&client->dev,"Probe: Unable to register %s input device\n", ts->input_dev->name);goto err_input_register_device_failed;}/* hcj: for debug guitar */printk(KERN_INFO "Registered input device for guitar.\n");ts->use_irq = 0;ts->retry=0;ts->bad_data = 0;client->irq=TS_INT;if (client->irq){ret = gpio_request(INT_PORT, "TS_INT");//Request IOif (ret < 0) {dev_err(&client->dev, "Failed to request GPIO:%d, ERRNO:%d\n",(int)INT_PORT,ret);goto err_gpio_request_failed;}ret = s3c_gpio_cfgpin(INT_PORT, INT_CFG);//Set IO port functionret = request_irq(TS_INT, goodix_ts_irq_handler , IRQ_TYPE_EDGE_RISING,client->name, ts);if (ret != 0) {dev_err(&client->dev,"Can't allocate touchscreen's interrupt!ERRNO:%d\n", ret);gpio_free( INT_PORT);goto err_gpio_request_failed;}else {disable_irq(TS_INT);ts->use_irq = 1;dev_dbg(&client->dev,"Reques EIRQ %d succesd on GPIO:%d\n",TS_INT,INT_PORT);//hcj: debug printk(KERN_CRIT "Request EIRQ %d succesd on GPIO:%d\n",TS_INT,INT_PORT);}}/* hcj: for debug guitar */printk(KERN_INFO "End of probe for guitar.\n");err_gpio_request_failed:if (!ts->use_irq) {hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);ts->timer.function = goodix_ts_timer_func;hrtimer_start(&ts->timer, ktime_set(1, 0), HRTIMER_MODE_REL);}//-------------------------------------------------------------------------------gpio_set_value(SHUTDOWN_PORT, 0);msleep(10);for(count=0; count<3; count++){ret=goodix_init_panel(ts);if(ret != 0)//Initiall failedcontinue;else{if(ts->use_irq)enable_irq(TS_INT);break;}}if(ret != 0) {ts->bad_data=1;goto err_init_godix_ts;}goodix_read_version(ts);msleep(500);#ifdef CONFIG_HAS_EARLYSUSPENDts->early_suspend.level = EARLY_SUSPEND_LEVEL_BLANK_SCREEN + 1;ts->early_suspend.suspend = goodix_ts_early_suspend;ts->early_suspend.resume = goodix_ts_late_resume;register_early_suspend(&ts->early_suspend);#endifdev_dbg(&client->dev,"Start %s in %s mode\n", ts->input_dev->name, ts->use_irq ? "Interrupt" : "Polling\n");return 0;err_init_godix_ts:if(ts->use_irq)free_irq(TS_INT,ts);gpio_request(INT_PORT,"TS_INT");gpio_free(INT_PORT);err_input_register_device_failed:input_free_device(ts->input_dev);err_input_dev_alloc_failed:i2c_set_clientdata(client, NULL);kfree(ts);err_i2c_failed:gpio_direction_input(SHUTDOWN_PORT);gpio_free(SHUTDOWN_PORT);err_alloc_data_failed:err_check_functionality_failed:return ret;}/*******************************************************功能：驱动资源释放参数：client：设备结构体return：执行结果码，0表示正常执行********************************************************/static int goodix_ts_remove(struct i2c_client *client){struct goodix_ts_data *ts = i2c_get_clientdata(client);#ifdef CONFIG_HAS_EARLYSUSPENDunregister_early_suspend(&ts->early_suspend);#endifif (ts->use_irq)free_irq(client->irq, ts);elsehrtimer_cancel(&ts->timer);gpio_direction_input(SHUTDOWN_PORT);gpio_free(SHUTDOWN_PORT);if (ts->use_irq)gpio_free(INT_PORT);dev_notice(&client->dev,"The driver is removing...\n");i2c_set_clientdata(client, NULL);input_unregister_device(ts->input_dev);if(ts->input_dev)kfree(ts->input_dev);kfree(ts);return 0;}//停用设备static int goodix_ts_suspend(struct i2c_client *client, pm_message_t mesg){int ret;struct goodix_ts_data *ts = i2c_get_clientdata(client);if (ts->use_irq)disable_irq(client->irq);elsehrtimer_cancel(&ts->timer);ret = cancel_work_sync(&ts->work);//if (ret && ts->use_irq) //enable_irq(client->irq);//TODO:工作队列禁用失败，则停止发送触摸屏中断if (ts->power) {ret = ts->power(0);if (ret < 0)printk(KERN_ERR "goodix_ts_resume power off failed\n");}return 0;}//重新唤醒static int goodix_ts_resume(struct i2c_client *client){int ret;struct goodix_ts_data *ts = i2c_get_clientdata(client);if (ts->power) {ret = ts->power(1);if (ret < 0)printk(KERN_ERR "goodix_ts_resume power on failed\n");}if (ts->use_irq)enable_irq(client->irq);if (!ts->use_irq)hrtimer_start(&ts->timer, ktime_set(1, 0), HRTIMER_MODE_REL);return 0;}#ifdef CONFIG_HAS_EARLYSUSPENDstatic void goodix_ts_early_suspend(struct early_suspend *h){struct goodix_ts_data *ts;ts = container_of(h, struct goodix_ts_data, early_suspend);goodix_ts_suspend(ts->client, PMSG_SUSPEND);}static void goodix_ts_late_resume(struct early_suspend *h){struct goodix_ts_data *ts;ts = container_of(h, struct goodix_ts_data, early_suspend);goodix_ts_resume(ts->client);}#endif//可用于该驱动的 设备名—设备ID 列表//only one clientstatic const struct i2c_device_id goodix_ts_id[] = {{ GOODIX_I2C_NAME, 0 },{ }};MODULE_DEVICE_TABLE(i2c,goodix_ts_id);//设备驱动结构体static struct i2c_driver goodix_ts_driver = {.probe= goodix_ts_probe,.remove= goodix_ts_remove,#ifndef CONFIG_HAS_EARLYSUSPEND.suspend= goodix_ts_suspend,.resume= goodix_ts_resume,#endif.id_table= goodix_ts_id,.driver = {.name= GOODIX_I2C_NAME,.owner = THIS_MODULE,},};/*******************************************************功能：驱动加载函数return：执行结果码，0表示正常执行********************************************************/static int __devinit goodix_ts_init(void){int ret;printk(KERN_INFO "Touchscreen driver of guitar is installing...\n");goodix_wq = create_workqueue("goodix_wq");if (!goodix_wq) {printk(KERN_ALERT "creat workqueue faiked\n");return -ENOMEM;}ret=i2c_add_driver(&goodix_ts_driver);return ret; }/*******************************************************功能：驱动卸载函数参数：client：设备结构体********************************************************/static void __exit goodix_ts_exit(void){printk(KERN_INFO "Touchscreen driver of guitar is exiting...\n");i2c_del_driver(&goodix_ts_driver);if (goodix_wq)destroy_workqueue(goodix_wq);}//late_initcall(goodix_ts_init);module_init(goodix_ts_init);module_exit(goodix_ts_exit);MODULE_DESCRIPTION("Goodix Touchscreen Driver");MODULE_LICENSE("GPL");
