一，Ilitek 触摸屏简介

1. Ilitek 提供多种型号的触控屏控制器，如 ILI6480、ILI9341 等，采用 I2C 接口。
   这些控制器能够支持多点触控，并具有优秀的灵敏度和响应速度。

2. Ilitek 的触摸屏控制器监测屏幕上的触摸事件。
   当触摸发生时，控制器将触摸坐标（通常是 x 和 y 坐标）通过 I2C 总线发送给主机。

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二，DTS配置

&i2c1 {status = "okay";ilitek@41 {compatible = "tchip,ilitek";reg = <0x41>;ilitek,irq-gpio = <&gpio7 6 GPIO_ACTIVE_HIGH>;ilitek,reset-gpio = <&gpio7 15 GPIO_ACTIVE_HIGH>; //修改相对应的gpio参数pinctrl-names = "default";pinctrl-0 = <&ilitek_gpio_e>;status = "okay";};
};&pinctrl {touchscreen {ilitek_gpio_e: ilitek-gpio-e {rockchip,pins =<7 6 RK_FUNC_GPIO &pcfg_pull_up>,<7 15 RK_FUNC_GPIO &pcfg_pull_up>;};};
};

注：一定要对应的I2C bus节点（硬件原理图上会有标注）。

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三，驱动文件配置

1. ilitek_lim.c

static int ilitek_i2c_probe(struct i2c_client *client,const struct i2c_device_id *id)
{int ret = 0;int revert_x=0;int revert_y=0;int revert_x_y=0;struct device_node *param_node;
#ifdef ILI_UPDATE_FW#ifdef UPDATE_THREADEstruct task_struct *thread_update = NULL;#endif
#endif#ifdef RECOGNITION_LONGTIME_BUTTON
struct task_struct *thread_longtime_button = NULL;
#endif#ifdef WRITE_2210_CFGstruct task_struct *thread_write_cfg = NULL;
#endif#if IC2120int i = 0;
#endif//int i = 0;//uint8_t buf[8] = {0};
#ifdef DEBUG_NETLINKstruct netlink_kernel_cfg cfg = {.groups = 0,.input	= udp_receive,};#endiftp_log_info("Enter ilitek_i2c_probe +++++++++ client->addr = 0x%x++++++\n", client->addr);if(!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)){tp_log_err("%s, I2C_FUNC_I2C not support\n", __func__);return -1;}// initialize global variable#ifdef TOOLmemset(&dev_ilitek, 0, sizeof(struct dev_data));#endifmemset(&i2c, 0, sizeof(struct i2c_data));// initialize mutex object
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 37)init_MUTEX(&i2c.wr_sem);
#elsesema_init(&i2c.wr_sem,1);
#endifi2c.wr_sem.count = 1;mutex_init(&(i2c.irq_mutex));i2c.report_status = 1;i2c.client = client;#ifdef CONFIG_ENABLE_REGULATOR_POWER_ONret = ilitek_get_regulator();if (ret) {tp_log_err("%s, ilitek_get_regulator failed\n", __func__);return ret;}ret = ilitek_power_on(true);if (ret) {tp_log_err("%s, power on failed\n", __func__);return ret;}#endif//ret = ilitek_request_io_port(client);if (ret != 0){tp_log_err("%s, io error", __func__);return ret;}param_node = of_find_node_by_path("/smdt_param");if (!param_node){printk("gt9xx wxl error smdt_param not node!!!\n");}of_property_read_u32(param_node, "ctp_revert_x_flag", &revert_x);of_property_read_u32(param_node, "ctp_revert_y_flag", &revert_y);of_property_read_u32(param_node, "ctp_exchange_x_y_flag", &revert_x_y);if(revert_x == 1 )REVERT_X = 1;else    REVERT_X = 0;if(revert_y == 1 )REVERT_Y = 1;else    REVERT_Y = 0;if(revert_x_y == 1 )EXCHANG_XY = 1;else    EXCHANG_XY = 0;i2c.client->irq  = gpio_to_irq(i2c.irq_gpio);tp_log_info("ilitek i2c.irq_gpio = %d, i2c.client->irq = %d\n", i2c.irq_gpio, i2c.client->irq);i2c.valid_i2c_register = 1;#if 1ilitek_reset(i2c.reset_gpio);#endif#if !IC2120mdelay(200);#elsefor (i = 0; i < 30; i++ ) {ret = ilitek_poll_int();tp_log_info("ilitek int status = %d\n", ret);if (ret == 0) {break;}else {mdelay(5);}}if (i >= 30) {#ifdef ILI_UPDATE_FWtp_log_info("ilitek reset but int not pull low so driver_upgrade_flag = true\n");driver_upgrade_flag = true;#endif}else #endif{#if 0msleep(2000);for (i = 0; i < 127; i++) {//buf[0] = 0x10;client->addr = i;ret = ilitek_i2c_write_and_read(i2c.client, buf, 0, 10, buf, 4);tp_log_info("ilitek %s, write 0x10 read buf = %X, %X, %X\n", __func__, buf[0], buf[1], buf[2]);if (ret < 0) {mdelay(5);}else {tp_log_info("ilitek %s, client->addr = 0x%X, read buf = %X, %X, %X\n", __func__, client->addr, buf[0], buf[1], buf[2]);tp_log_info("ilitek %s, client->addr = 0x%X, read buf = %X, %X, %X\n", __func__, client->addr, buf[0], buf[1], buf[2]);tp_log_info("ilitek %s, client->addr = 0x%X, read buf = %X, %X, %X\n", __func__, client->addr, buf[0], buf[1], buf[2]);tp_log_info("ilitek %s, client->addr = 0x%X, read buf = %X, %X, %X\n", __func__, client->addr, buf[0], buf[1], buf[2]);tp_log_info("ilitek %s, client->addr = 0x%X, read buf = %X, %X, %X\n", __func__, client->addr, buf[0], buf[1], buf[2]);break;}}#endif// read touch parameterret = ilitek_i2c_read_tp_info();if(ret < 0){tp_log_err("ilitek read tp info fail free gpio\n");if (gpio_is_valid(i2c.irq_gpio)) {gpio_free(i2c.irq_gpio);}if (gpio_is_valid(i2c.reset_gpio)) {gpio_free(i2c.reset_gpio);}return ret;}}
#ifdef CLOCK_INTERRUPT
#ifdef REPORT_THREADi2c.thread = kthread_run(ilitek_i2c_touchevent_thread, NULL, "ilitek_i2c_thread");if(i2c.thread == (struct task_struct*)ERR_PTR){i2c.thread = NULL;tp_log_err("%s, kthread create, error\n", __func__);}
#endif
#endifilitek_handle_irqorpolling();i2c.input_dev = input_allocate_device();if(i2c.input_dev == NULL){tp_log_err("%s, allocate input device, error\n", __func__);return -1;}ilitek_set_input_param(i2c.input_dev, i2c.max_tp, i2c.max_x, i2c.max_y);ret = input_register_device(i2c.input_dev);if(ret){tp_log_err("%s, register input device, error\n", __func__);return ret;}i2c.valid_input_register = 1;tp_log_info("%s, register input device, success\n", __func__);
#ifdef ILI_UPDATE_FW#ifndef UPDATE_THREADE{update_wait_flag = 1;ret = ilitek_upgrade_firmware();if(ret == ILITEK_UPDATE_OK) {tp_log_info("update end\n");}else if(ret == ILITEK_I2C_TRANSFER_ERR) {tp_log_info("i2c communication error\n");}if(i2c.reset_request_success){ilitek_reset(i2c.reset_gpio);}// read touch parameterret=ilitek_i2c_read_tp_info();if(ret < 0){tp_log_err("ilitek_i2c_read_tp_info err\n");return ret;}update_wait_flag = 0;#if 1input_unregister_device(i2c.input_dev);#if 1i2c.input_dev = input_allocate_device();if(i2c.input_dev == NULL){tp_log_err("%s, allocate input device, error\n", __func__);return -1;}#endif// register input device//memset(i2c.input_dev, 0, sizeof(struct input_dev));// register input deviceilitek_set_input_param(i2c.input_dev, i2c.max_tp, i2c.max_x, i2c.max_y);ret = input_register_device(i2c.input_dev);if(ret){tp_log_err("%s, register input device, error\n", __func__);return ret;}tp_log_info("%s, register input device, success\n", __func__);#endif}#else{thread_update= kthread_run(ilitek_i2c_update_thread, NULL, "ilitek_i2c_updatethread");if(thread_update == (struct task_struct*)ERR_PTR){thread_update = NULL;tp_log_err("%s,thread_update kthread create, error\n", __func__);}}#endif
#endif#ifdef WRITE_2210_CFGthread_write_cfg = kthread_run(ilitek_i2c_write_cfg_thread, NULL, "ilitek_i2c_write_cfg_thread");if(thread_write_cfg == (struct task_struct*)ERR_PTR){thread_write_cfg = NULL;tp_log_err("%s,thread_write_cfg kthread create, error\n", __func__);}
#endif#ifdef RECOGNITION_LONGTIME_BUTTONthread_longtime_button = kthread_run(ilitek_i2c_check_longtime_button_thread, NULL, "ilitek_i2c_check_longtime_button_thread");if(thread_longtime_button == (struct task_struct*)ERR_PTR){thread_longtime_button = NULL;tp_log_err("%s,thread_longtime_button kthread create, error\n", __func__);}
#endif#ifdef GESTUREilitek_system_resume = 1;input_set_capability(i2c.input_dev, EV_KEY, KEY_POWER);input_set_capability(i2c.input_dev, EV_KEY, KEY_W);input_set_capability(i2c.input_dev, EV_KEY, KEY_LEFT);input_set_capability(i2c.input_dev, EV_KEY, KEY_RIGHT);input_set_capability(i2c.input_dev, EV_KEY, KEY_UP);input_set_capability(i2c.input_dev, EV_KEY, KEY_DOWN);input_set_capability(i2c.input_dev, EV_KEY, KEY_O);input_set_capability(i2c.input_dev, EV_KEY, KEY_C);input_set_capability(i2c.input_dev, EV_KEY, KEY_E);input_set_capability(i2c.input_dev, EV_KEY, KEY_M);
#endif#ifdef TOOLret = create_tool_node();
#endif#ifdef SENSOR_TEST
#ifdef SYS_ATTR_FILEilitek_sensor_test_init();
#endif
#endif#ifdef HALL_CHECK
#if HALL_CHECK == HALL_CHECK_OTHERilitek_hall_check_init();	
#elif HALL_CHECK == HALL_CHECK_HWilitek_hall_check_hw_init();	
#endif //end of HALL_CHECK
#endifReport_Flag=0;#ifdef PLAT_ROCKCHIPi2c.tp.tp_resume = ilitek_i2c_late_resume;i2c.tp.tp_suspend = ilitek_i2c_early_suspend;tp_register_fb(&i2c.tp);
#endif#ifdef ILITEK_ESD_CHECKINIT_DELAYED_WORK(&esd_work, ilitek_touch_esd_func);esd_wq = create_singlethread_workqueue("esd_wq");	 if (!esd_wq) {return -ENOMEM;}queue_delayed_work(esd_wq, &esd_work, delay);
#endif #ifdef WRITE_2210_CFGret = sysfs_create_group(&client->dev.kobj, &ilitek_test_attribute_group);if (ret) {dev_err(&client->dev, "failed to create sysfs attributes: %d\n",ret);return ret;}
#endif
#ifdef DEBUG_NETLINK//netlink_sock = netlink_kernel_create(&init_net, 21, 0,udp_receive, NULL, THIS_MODULE);netlink_sock = netlink_kernel_create(&init_net, 21, &cfg);#endifdevice_init_wakeup(&client->dev, 1);return 0;
}

ilitek_i2c_probe 函数是 I2C 设备的初始化函数，在设备被识别和加载驱动时调用。它的主要职责包括：

• 初始化设备：根据 I2C 客户端信息和设备 ID 来配置和初始化设备。
• 分配所需资源：如内存、GPIO 等。
• 设置中断处理程序（如适用）：为设备配置中断。
• 注册输入设备：根据设备类型设置输入设备的相关参数。

2. ilitek_ts.h

ilitek_ts.h用于定义驱动相关的数据结构、常量、函数原型以及其他必要的包含。该头文件的内容用于抽象和管理与 Ilitek 触摸屏控制器之间的接口。

3. ILI25110CN080O0003_CRC.ili

ILI25110CN080O0003_CRC.ili 可能是与 Ilitek 触摸屏控制器 ILI2511 系列相关的文件。

4. 驱动移植

a.将原厂提供的的驱动(ilitek)拷贝到下面的文件夹：

./kernel/drivers/input/touchscreen

b. 然后修改 touchscreen 目录下的 Makefile以及Kconfig。这个Makefile中定义的就是要编译哪个平台的触摸屏驱动的。

kernel/drivers/input/touchscreen/Makefile中添加：
obj-$(CONFIG_TOUCHSCREEN_ILITEK)     += ilitek/--------------------------------------------------------
kernel/drivers/input/touchscreen/Kconfig中添加：
config TOUCHSCREEN_ILITEKtristate "ILITEK touchscreens matched with screen support for rockchip platform"depends on I2C && ARCH_ROCKCHIPhelpSay Y here if you have a touchscreen interface using the ILITEKtouchscreen chip on Rockchip platform, and your board-specificinitialization code includes that in its table of IIC devices.If unsure, say N.

c. 内核中加载驱动：

kernel/arch/arm/configs/rockchip_defconfig中添加：
CONFIG_TOUCHSCREEN_ILITEK=y

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四，调试

1. 确认 /sys/bus/i2c/devices 下有裝置节点 (-0041)；
   
2. 报点问题：
   有触摸效果，只是坐标 mapping 问题。

X、Y 需要交換。
將 ILITEK_ROTATE_FLAG 设定值由 0 改为 1 或由 1 改为 0。

X、Y 值要做鏡像变化。
將 ILITEK_REVERT_X 或 ILITEK_REVERT_Y 的设定值由 0 改为 1 或由 1 改为 0。

若需要指定显示屏的解析度。
则开放 ILITEK_USE_LCM_RESOLUTION 宏，同时將TOUCH_SCREEN_X_MAX 和 TOUCH_SCREEN_Y_MAX 设为正确值。