MTK TP驱动移植

对于MTK TP驱动移植一般分为六部分：

1、硬件IO口配置；

2、TP驱动移植；

3、I2C通信；

4、中断触发；

5、数据上报；

6、虚拟按键；

硬件电路：

1、GPIO配置

打开 mediatek\dct\DrvGen.exe

选择 mediatek\custom\xiaoxi\kernel\dct\dct\codegen.dws 配置文件

配置EINT7_CTP引脚、CTP_RST复位引脚

2、TP驱动移植（以ft5x16为例）

在\mediatek\custom\common\kernel\touchpanel目录下创建ft5x16，将供应商提供的驱动驱动资料拷贝到该目录下；

修改配置文件：mediatek\config\prj\ProjectConfig.mk下的CUSTOM_KERNEL_TOUCHPANEL其值由改为ft5x16，表明对应ft5x16子目录；

打开ft5x16.c文件，修改一下：

static struct i2c_board_info __initdata ft5x16_i2c_tpd={ I2C_BOARD_INFO("ft5x16", (0x70>>1))}; //"ft5x16"为设备名 ，设备地址为高7位static struct tpd_driver_t tpd_device_driver = {.tpd_device_name = "FT5x16",.tpd_local_init = tpd_local_init, .suspend = tpd_suspend,.resume = tpd_resume,
#ifdef TPD_HAVE_BUTTON  .tpd_have_button = 1,
#else.tpd_have_button = 0,
#endif
};/* called when loaded into kernel */
static int __init tpd_driver_init(void) {printk("MediaTek FT5x16 touch panel driver init\n");/* 注册板级设备信息 */i2c_register_board_info(IIC_PORT, &ft5x16_i2c_tpd, 1);  //IIC_PORT表示i2c控制器号，由电路原理图可知TP设备连接到i2c控制器0，ft5x16_i2c_tpd为i2c设备结构，1表示该i2c_board_info个数if(tpd_driver_add(&tpd_device_driver) < 0)printk("add FT5x16 driver failed\n");return 0;
}
</span>

重新编译：./mk n k && ./mk bootimage

3、I2C通信

新驱动编译进内核，启动内核后，我们怎样验证i2c接口能够正常通信呢？

系统启动后通过串口或adb shell进入系统命令行窗口，查询/sys/bus/i2c/devices目录下是否有0-0038信息，查询/sys/bus/i2c/drivers目录下是否存在‘ft5x16’设备名；先保证i2c能够正常通信；

4、中断触发

中断注册函数：mt_eint_registration(CUST_EINT_TOUCH_PANEL_NUM, CUST_EINT_TOUCH_PANEL_TYPE, tpd_eint_interrupt_handler, 1);

//tpd_eint_interrupt_handler函数为中断回调函数

5、数据上报

当触摸屏产生中断的时候就会调用到该接口；然后在中断处理函数中唤醒运行在子线程中的等待队列，再通过子线程获取TP数据并上报到系统；

static DECLARE_WAIT_QUEUE_HEAD(waiter);  //初始化等待队列thread = kthread_run(touch_event_handler, 0, TPD_DEVICE);  //新建线程static int touch_event_handler(void *unused)
{ ......do{mt_eint_unmask(CUST_EINT_TOUCH_PANEL_NUM); set_current_state(TASK_INTERRUPTIBLE); wait_event_interruptible(waiter,tpd_flag!=0);  //等待队列进入休眠，等待唤醒tpd_flag = 0;set_current_state(TASK_RUNNING);......if (tpd_touchinfo(&cinfo, &pinfo))   //获取TP数据{//TPD_DEBUG("point_num = %d\n",point_num);TPD_DEBUG_SET_TIME;if(point_num >0) {for(i =0; i<point_num; i++)//only support 3 point{          cinfo.x[i] = cinfo.x[i];cinfo.y[i] = cinfo.y[i];tpd_down(cinfo.x[i], cinfo.y[i], cinfo.id[i]); //上报按下数据printk(KERN_DEBUG"----calibration----- X:%4d, Y:%4d, P:%4d \n", cinfo.x[i], cinfo.y[i], cinfo.id[i]);}input_sync(tpd->dev);}else  {tpd_up(cinfo.x[0], cinfo.y[0]);      //上报弹起数据//TPD_DEBUG("release --->\n"); //input_mt_sync(tpd->dev);input_sync(tpd->dev);}}......}while(!kthread_should_stop());return 0;
}

TP数据可以通过打印的方式进行查看，也可以激活‘系统设置’中‘开发者选项’的‘指针位置’，现在触摸操作在LCD的轨迹，也可以在packages\apps\Launcher2\src\com\android\launcher2\Launcher.java的onCreate方法最后添加Settings.System.putInt(this.getContentResolver(),Settings.System.POINTER_LOCATION, 1); 在Launcher中开启‘指针位置’功能（需要mm Launcher模块并重新打包和烧录system.img文件）；

注：如果TP获取到的数据比较乱的时候建议通过打开‘指针位置’功能进行查看，排除TP固件分辨与LCD没对应等问题；

6、虚拟按键

static struct tpd_driver_t tpd_device_driver = {.tpd_device_name = "FT5x16",.tpd_local_init = tpd_local_init, .suspend = tpd_suspend,.resume = tpd_resume,
#ifdef TPD_HAVE_BUTTON  .tpd_have_button = 1,
#else.tpd_have_button = 0,
#endif
};

从tpd_driver_t结构可知tpd_have_button成员为虚拟按键标志位；由宏TPD_HAVA_BUTTON开关决定的，宏定义在tpd_custom_fts.h中；

在tpd_custom_fts.h中定义了一系列关于虚拟按键的宏：

#define TPD_HAVE_BUTTON //虚拟按键开关
#define TPD_BUTTON_WIDTH (200) //按键宽度
#define TPD_BUTTON_HEIGH (100) //按键高度
#define TPD_KEY_COUNT 3 //按键个数
#define TPD_KEYS {KEY_MENU, KEY_HOMEPAGE, KEY_BACK} //按键对应的功能
#define TPD_KEYS_DIM {{80,900,TPD_BUTTON_WIDTH,TPD_BUTTON_HEIGH}, {240,900,TPD_BUTTON_WIDTH,TPD_BUTTON_HEIGH}, {400,900,TPD_BUTTON_WIDTH,TPD_BUTTON_HEIGH}} //按键对应位置

TPD_KEYS_DIM中的坐标是该按键区域的中心点：

TP驱动简要分析

static struct tpd_driver_t tpd_device_driver = {.tpd_device_name = FT5x16,.tpd_local_init = tpd_local_init,  //初始化函数.suspend = tpd_suspend,.resume = tpd_resume,
#ifdef TPD_HAVE_BUTTON.tpd_have_button = 1,
#else.tpd_have_button = 0,
#endif
};/* called when loaded into kernel */
static int __init tpd_driver_init(void) {printk("MediaTek FT5x16 touch panel driver init\n");i2c_register_board_info(0, &ft5x16_i2c_tpd, 1);  //注册板级设备信息if(tpd_driver_add(&tpd_device_driver) < 0)  //添加驱动printk("add FT5x16 driver failed\n");return 0;
}

MTK自己编写了一套TP框架，通过该框架管理TP设备，tpd_driver_add为框架的接口之一；系统通过tpd_driver_add添加驱动后会回调tpd_local_init函数；

#ifdef TPD_HAVE_BUTTON
static int tpd_keys_local[TPD_KEY_COUNT] = TPD_KEYS;   //存放按键功能信息
static int tpd_keys_dim_local[TPD_KEY_COUNT][4] = TPD_KEYS_DIM;   //存放虚拟按键信息
#endifstatic int tpd_local_init(void)
{TPD_DMESG("FTS I2C Touchscreen Driver (Built %s @ %s)\n", __DATE__, __TIME__);if(i2c_add_driver(&tpd_i2c_driver)!=0)  //注册i2c驱动{TPD_DMESG("FTS unable to add i2c driver.\n");return -1;}if(tpd_load_status == 0) {TPD_DMESG("FTS add error touch panel driver.\n");i2c_del_driver(&tpd_i2c_driver);return -1;}#ifdef TPD_HAVE_BUTTON      //如果定义虚拟按键，则初始化按键信息tpd_button_setting(TPD_KEY_COUNT, tpd_keys_local, tpd_keys_dim_local);// initialize tpd button data
#endif   #if (defined(TPD_WARP_START) && defined(TPD_WARP_END))    TPD_DO_WARP = 1;memcpy(tpd_wb_start, tpd_wb_start_local, TPD_WARP_CNT*4);memcpy(tpd_wb_end, tpd_wb_start_local, TPD_WARP_CNT*4);
#endif #if (defined(TPD_HAVE_CALIBRATION) && !defined(TPD_CUSTOM_CALIBRATION))memcpy(tpd_calmat, tpd_def_calmat_local, 8*4);memcpy(tpd_def_calmat, tpd_def_calmat_local, 8*4);
#endif  TPD_DMESG("end %s, %d\n", __FUNCTION__, __LINE__);  tpd_type_cap = 1;return 0;
}

向系统注册i2c驱动后，如果找到对应的设备就会调用tpd_probe函数；

static const struct i2c_device_id ft5x16_tpd_id[] = {{TPD_NAME,0},{}};static struct i2c_driver tpd_i2c_driver = {.driver = {.name     = TPD_NAME,},.probe        = tpd_prob,.remove     = __devexit_p(tpd_remove),.id_table    = ft5x16_tpd_id,.detect    = tpd_detect,
};static int __devinit tpd_probe(struct i2c_client *client, const struct i2c_device_id *id)
{    int retval = TPD_OK;char data;u8 report_rate=0;int err=0;int reset_count = 0;u8 chip_id,i;reset_proc:   i2c_client = client;
#ifdef MAIERXUN_TP_COMif(touchpanel_flag){return 0;}
#endif//复位  //power on, need confirm with SAmt_set_gpio_mode(GPIO_CTP_RST_PIN, GPIO_CTP_RST_PIN_M_GPIO);mt_set_gpio_dir(GPIO_CTP_RST_PIN, GPIO_DIR_OUT);mt_set_gpio_out(GPIO_CTP_RST_PIN, GPIO_OUT_ZERO);  msleep(5);TPD_DMESG(" fts ic reset\n");//打开TP电源
#ifdef TPD_POWER_SOURCE_CUSTOMhwPowerOn(TPD_POWER_SOURCE_CUSTOM, VOL_3300, "TP");
#elsehwPowerOn(MT65XX_POWER_LDO_VGP2, VOL_3300, "TP");
#endifmt_set_gpio_mode(GPIO_CTP_RST_PIN, GPIO_CTP_RST_PIN_M_GPIO);mt_set_gpio_dir(GPIO_CTP_RST_PIN, GPIO_DIR_OUT);mt_set_gpio_out(GPIO_CTP_RST_PIN, GPIO_OUT_ONE);#ifdef TPD_CLOSE_POWER_IN_SLEEP    hwPowerDown(TPD_POWER_SOURCE,"TP");hwPowerOn(TPD_POWER_SOURCE,VOL_3300,"TP");msleep(100);#else  /* 结束复位 */mt_set_gpio_mode(GPIO_CTP_RST_PIN, GPIO_CTP_RST_PIN_M_GPIO);mt_set_gpio_dir(GPIO_CTP_RST_PIN, GPIO_DIR_OUT);mt_set_gpio_out(GPIO_CTP_RST_PIN, GPIO_OUT_ZERO);  msleep(5);TPD_DMESG(" fts ic reset\n");mt_set_gpio_mode(GPIO_CTP_RST_PIN, GPIO_CTP_RST_PIN_M_GPIO);mt_set_gpio_dir(GPIO_CTP_RST_PIN, GPIO_DIR_OUT);mt_set_gpio_out(GPIO_CTP_RST_PIN, GPIO_OUT_ONE);
#endif/* 初始化中断引脚 */mt_set_gpio_mode(GPIO_CTP_EINT_PIN, GPIO_CTP_EINT_PIN_M_EINT);mt_set_gpio_dir(GPIO_CTP_EINT_PIN, GPIO_DIR_IN);mt_set_gpio_pull_enable(GPIO_CTP_EINT_PIN, GPIO_PULL_ENABLE);mt_set_gpio_pull_select(GPIO_CTP_EINT_PIN, GPIO_PULL_UP);/* 中断配置和注册 */mt_eint_set_hw_debounce(CUST_EINT_TOUCH_PANEL_NUM, CUST_EINT_TOUCH_PANEL_DEBOUNCE_CN);mt_eint_registration(CUST_EINT_TOUCH_PANEL_NUM, CUST_EINT_TOUCH_PANEL_TYPE, tpd_eint_interrupt_handler, 1);  //注册中断处理函数，TP产生中断时就会回调tpd_eint_interrupt函数mt_eint_unmask(CUST_EINT_TOUCH_PANEL_NUM);  msleep(400);err=i2c_smbus_read_i2c_block_data(i2c_client, 0x00, 1, &data);TPD_DMESG("gao_i2c:err %d,data:%d\n", err,data);if(err< 0 || data!=0)// reg0 data running state is 0; other state is not 0{TPD_DMESG("I2C transfer error, line: %d\n", __LINE__);
#ifdef TPD_RESET_ISSUE_WORKAROUNDif ( reset_count < TPD_MAX_RESET_COUNT ){reset_count++;goto reset_proc;}
#endif//add at 20150330 by zhu
#ifdef MAIERXUN_TP_COMtouchpanel_flag=false;
#endifreturn -1; }......#ifdef VELOCITY_CUSTOM_FT5206if((err = misc_register(&tpd_misc_device)))  //注册混杂设备驱动{printk("mtk_tpd: tpd_misc_device register failed\n");}
#endif#ifdef TPD_AUTO_UPGRADEprintk("********************Enter CTP Auto Upgrade********************\n");fts_ctpm_auto_upgrade(i2c_client);
#endifthread = kthread_run(touch_event_handler, 0, TPD_DEVICE);  //创建子线程，通过该子线程获取和上报数据if (IS_ERR(thread)){ retval = PTR_ERR(thread);TPD_DMESG(TPD_DEVICE " failed to create kernel thread: %d\n", retval);}TPD_DMESG("FTS Touch Panel Device Probe %s\n", (retval < TPD_OK) ? "FAIL" : "PASS");/* 初始化TP的P-sensor功能，暂不分析 */
#ifdef TPD_PROXIMITYstruct hwmsen_object obj_ps;obj_ps.polling = 0;//interrupt modeobj_ps.sensor_operate = tpd_ps_operate;if((err = hwmsen_attach(ID_PROXIMITY, &obj_ps))){APS_ERR("proxi_fts attach fail = %d\n", err);}else{APS_ERR("proxi_fts attach ok = %d\n", err);}
#endif#ifdef MAIERXUN_TP_COMtouchpanel_flag=true;
#endifreturn 0;}

/* 中断处理函数 */

static void tpd_eint_interrupt_handler(void)
{//TPD_DEBUG("TPD interrupt has been triggered\n");TPD_DEBUG_PRINT_INT;tpd_flag = 1; wake_up_interruptible(&waiter);  //唤醒等待队列
}

中断处理遵循中断上下文的设计原则，使得中断子程序只是简单唤醒等待队列就可以了，没有多余的操作；

/* 子线程处理函数 */

static int touch_event_handler(void *unused)
{ struct touch_info cinfo, pinfo;int i=0;struct sched_param param = { .sched_priority = RTPM_PRIO_TPD };sched_setscheduler(current, SCHED_RR, ¶m);#ifdef TPD_PROXIMITYint err;hwm_sensor_data sensor_data;u8 proximity_status;#endifu8 state;do  //进入while循环进行睡眠-等待唤醒的操作{mt_eint_unmask(CUST_EINT_TOUCH_PANEL_NUM);  //中断使能（解除屏蔽）set_current_state(TASK_INTERRUPTIBLE); wait_event_interruptible(waiter,tpd_flag!=0);  //进入睡眠等待唤醒tpd_flag = 0;set_current_state(TASK_RUNNING);......#ifdef TPD_PROXIMITY  //TP的P-sensor功能，暂不分析if (tpd_proximity_flag == 1){i2c_smbus_read_i2c_block_data(i2c_client, 0xB0, 1, &state);TPD_PROXIMITY_DEBUG("proxi_5206 0xB0 state value is 1131 0x%02X\n", state);if(!(state&0x01)){tpd_enable_ps(1);}i2c_smbus_read_i2c_block_data(i2c_client, 0x01, 1, &proximity_status);TPD_PROXIMITY_DEBUG("proxi_5206 0x01 value is 1139 0x%02X\n", proximity_status);if (proximity_status == 0xC0){tpd_proximity_detect = 0;   }else if(proximity_status == 0xE0){tpd_proximity_detect = 1;}TPD_PROXIMITY_DEBUG("tpd_proximity_detect 1149 = %d\n", tpd_proximity_detect);if ((err = tpd_read_ps())){TPD_PROXIMITY_DMESG("proxi_5206 read ps data 1156: %d\n", err);  }sensor_data.values[0] = tpd_get_ps_value();sensor_data.value_divide = 1;sensor_data.status = SENSOR_STATUS_ACCURACY_MEDIUM;if ((err = hwmsen_get_interrupt_data(ID_PROXIMITY, &sensor_data))){TPD_PROXIMITY_DMESG(" proxi_5206 call hwmsen_get_interrupt_data failed= %d\n", err);  }}
#endifif (tpd_touchinfo(&cinfo, &pinfo))   //获取TP设备数据，并把数据保存在cinfob buf中{//TPD_DEBUG("point_num = %d\n",point_num);TPD_DEBUG_SET_TIME;if(point_num >0) {for(i =0; i<point_num; i++)//only support 3 point{printk(KERN_DEBUG"X:%4d, Y:%4d, P:%4d \n", cinfo.x[i], cinfo.y[i], cinfo.id[i]);cinfo.x[i] = cinfo.x[i];cinfo.y[i] = cinfo.y[i];tpd_down(cinfo.x[i], cinfo.y[i], cinfo.id[i]);  //按下数据处理printk(KERN_DEBUG"----calibration----- X:%4d, Y:%4d, P:%4d \n", cinfo.x[i], cinfo.y[i], cinfo.id[i]);}input_sync(tpd->dev);}else  {tpd_up(cinfo.x[0], cinfo.y[0]);    //弹起数据处理//TPD_DEBUG("release --->\n"); //input_mt_sync(tpd->dev);input_sync(tpd->dev);}}......}while(!kthread_should_stop());return 0;
}

/* 获取TP数据 */

static int tpd_touchinfo(struct touch_info *cinfo, struct touch_info *pinfo)
{int i = 0;char data[128] = {0};u16 high_byte,low_byte,reg;u8 report_rate =0;p_point_num = point_num;if (tpd_halt){TPD_DMESG( "tpd_touchinfo return ..\n");return false;}mutex_lock(&i2c_access);reg = 0x00;fts_i2c_Read(i2c_client, &reg, 1, data, 64);  //获取TP数据，一些TP是支持多点触控的，所以有可能就产生多个触点的数据mutex_unlock(&i2c_access);/*get the number of the touch points*/point_num= data[2] & 0x0f;TPD_DEBUG("point_num =%d\n",point_num);/* 根据芯片协议解析数据并存放在cinfo buf中 */for(i = 0; i < point_num; i++)  {cinfo->p[i] = data[3+6*i] >> 6; //event flag cinfo->id[i] = data[3+6*i+2]>>4; //touch id/*get the X coordinate, 2 bytes*/high_byte = data[3+6*i];high_byte <<= 8;high_byte &= 0x0f00;low_byte = data[3+6*i + 1];cinfo->x[i] = high_byte |low_byte;/*get the Y coordinate, 2 bytes*/high_byte = data[3+6*i+2];high_byte <<= 8;high_byte &= 0x0f00;low_byte = data[3+6*i+3];cinfo->y[i] = high_byte |low_byte;}}TPD_DEBUG(" cinfo->x[0] = %d, cinfo->y[0] = %d, cinfo->p[0] = %d\n", cinfo->x[0], cinfo->y[0], cinfo->p[0]);   return true;
}

static  void tpd_down(int x, int y, int p) {static int tpd_x = 0;static int tpd_y = 0;tpd_x = x;tpd_y = y;   /* 通过输入子系统上报数据 */input_report_key(tpd->dev, BTN_TOUCH, 1);input_report_abs(tpd->dev, ABS_MT_TOUCH_MAJOR, 20);input_report_abs(tpd->dev, ABS_MT_POSITION_X, x);input_report_abs(tpd->dev, ABS_MT_POSITION_Y, y);printk(KERN_ERR, "D[%4d %4d %4d] ", x, y, p);/* track id Start 0 */input_report_abs(tpd->dev, ABS_MT_TRACKING_ID, p); input_mt_sync(tpd->dev);
#ifndef MT6572if (FACTORY_BOOT == get_boot_mode()|| RECOVERY_BOOT == get_boot_mode())
#endif  {   tpd_button(x, y, 1); //虚拟按键的处理}TPD_EM_PRINT(x, y, x, y, p-1, 1);
}static  void tpd_up(int x, int y) {input_report_key(tpd->dev, BTN_TOUCH, 0);input_mt_sync(tpd->dev);TPD_EM_PRINT(x, y, x, y, 0, 0);#ifndef MT6572if (FACTORY_BOOT == get_boot_mode()|| RECOVERY_BOOT == get_boot_mode())
#endif{   tpd_button(x, y, 0); }
}

/* 虚拟按键判断和处理函数 */

void tpd_button(unsigned int x, unsigned int y, unsigned int down) {int i;if(down) {for(i=0;i<tpd_keycnt;i++) {/* 判断数据是否落在虚拟按键的范围内，数据处理算法实现了以坐标点为中心的虚拟按键 */if(x>=tpd_keys_dim[i][0]-(tpd_keys_dim[i][2]/2) &&x<=tpd_keys_dim[i][0]+(tpd_keys_dim[i][2]/2) &&y>=tpd_keys_dim[i][1]-(tpd_keys_dim[i][3]/2) &&y<=tpd_keys_dim[i][1]+(tpd_keys_dim[i][3]/2) &&!(tpd->btn_state&(1<<i)))    {input_report_key(tpd->kpd, tpd_keys[i], 1);  //上报按键input_sync(tpd->kpd);tpd->btn_state|=(1<<i);TPD_DEBUG("[mtk-tpd] press key %d (%d)\n",i, tpd_keys[i]);printk("[mtk-tpd] press key %d (%d)\n",i, tpd_keys[i]);}}} else {for(i=0;i<tpd_keycnt;i++) {if(tpd->btn_state&(1<<i)) {input_report_key(tpd->kpd, tpd_keys[i], 0);input_sync(tpd->kpd);TPD_DEBUG("[mtk-tpd] release key %d (%d)\n",i, tpd_keys[i]);printk("[mtk-tpd] release key %d (%d)\n",i, tpd_keys[i]);}}tpd->btn_state=0;}
}
tpd_keys_dim和tpd_keys的数据是通过tpd_button_setting初始化的，可以去看tpd_button_setting()的实现；

通过简单分析，由此可知MTK的TP驱动的整体框架跟普通TP驱动框架也是大致差不多；

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