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GOODIX TOUCH驱动移植
基于imx6芯片，Linux系统的touch驱动移植，IC是GOODIX GA657X
1.总体架构
参考：https://blog.csdn.net/zhaoxiaoqiang10_/article/details/24009889
硬件部分：其实触摸屏原理也比较简单，触摸屏和主控芯片间的联系，如下主要有三部分：1、IIC部分，初始化gt657x的数据和传回主控制的坐标位置信息就是通过IIC这条线传输的；
2、INT，当gt657x初触摸时，会发出中断通知主控接收信息（坐标数据）；
3、gt657x电源、复位这一部分，不同芯片有所不同，可以根据触摸屏芯片来配置
软件部分：
2.移植
配置iic，在设备树中添加ga657x的配置信息，包括设备地址、ping脚定义、参数配置
ga657x@5d { compatible = "goodix,ga657x"; reg = <0x5d>; //设备地址 status = "okay"; // pinctrl-names = "default"; // pinctrl-0 = <&ts_int_default>; reset-gpios = <&gpio3 31 GPIO_ACTIVE_LOW>; //reset管脚 tp-irq-gpio = <&gpio4 10 GPIO_ACTIVE_LOW>; //中断脚 irq-flags = <2>; touchscreen-max-id = <5>; touchscreen-size-x = <1279>; //触摸屏的分辨率大小 touchscreen-size-y = <719>; touchscreen-max-w = <255>; touchscreen-max-p = <255>; touchscreen-key-map = <50>, <35>, <103>, <108>; //按键地址 goodix,slide-wakeup = <0>; goodix,type-a-report = <0>; goodix,driver-send-cfg = <1>; //根据需求配置，1 会将驱动中的touch配置更新到固件中，0 则默认使用固件中刷写的配置 goodix,resume-in-workqueue = <0>; goodix,swap-x2y = <0>; goodix,esd-protect = <0>; goodix,auto-update = <0>; goodix,auto-update-cfg = <0>; goodix,power-off-sleep = <0>; goodix,pen-suppress-finger = <0>; goodix,cfg-group2 = [ 42 65 1B 1D 24 18 00 3B 52 9C 96 00 1E 50 3C 00 00 17 19 1C 14 22 FF 1E 78 00 00 0F 11 5E 22 22 F4 00 00 00 F0 00 05 D0 02 12 11 AA 13 12 11 10 0F 0E 0D 0C 0B 0A 09 08 07 06 05 04 03 02 01 00 14 15 16 17 18 19 1A 1B 1C 1D 26 25 24 23 22 21 20 1F 1E 1D 1C 1B 19 18 17 16 15 14 13 12 11 10 0F 0E 0D 0C 0B 0A 09 08 07 06 05 04 03 02 27 FF FF FF FF FF 00 19 2D 94 C1 52 0A 04 B4 B4 1B 9C 9C 26 80 80 2D 00 76 76 00 00 00 00 00 00 02 00 D4 04 5C 46 32 20 AA 02 27 12 10 8E 8C BF BF BF BF BF BF 02 14 03 2D 23 AF 05 0F 28 06 81 28 14 1E 3C A0 6F 64 28 00 00 24 01 ]; //配置信息，不同的屏配置不同，需要原厂提供适配的cfg };- 1
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移植代码，并修改上一级目录的Makefile和Kconfig文件，因为原厂提供的驱动代码已经将makefile和Kconfig写好，所以移植时，只需要将适配到我们自己的目录环境中添加编译
Kconfig： source "drivers/input/touchscreen/ga657x/Kconfig" Makefile obj-$(CONFIG_TOUCHSCREEN_GA657X) += ga657x/- 1
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配置内核，打开ga657x的配置选项，参与编译
│ Symbol: TOUCHSCREEN_GA657X [=y] │ │ Type : boolean │ │ Prompt: Goodix touchpanel GA657X series │ │ Location: │ │ -> Device Drivers │ │ -> Input device support │ │ -> Generic input layer (needed for keyboard, mouse, ...) (INPUT [=y]) │ │ (1) -> Touchscreens (INPUT_TOUCHSCREEN [=y]) │ │ Defined at drivers/input/touchscreen/ga657x/Kconfig:4 │ │ Depends on: !UML && INPUT [=y] && INPUT_TOUCHSCREEN [=y] && I2C [=y]- 1
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以上配置完成可以进行下一步调试，重新刷写编译完成的kernel，确保硬件连接正常，开机后应该就可以在/dev/input/下发现设备节点
使用evtest工具测试，一般就可以测试触摸事件了: evtest /dev/input/event0问题
点击触屏，界面还是没有反应，可能是触屏里没有烧录配置文件或者配置文件不对，所以联系触屏（所使用的屏幕和液晶、触屏组合屏）厂家了解情况和获取配置文件，或者是IIC等ping脚配置错误，需要结合原理图分析。
开短路检测
在GA657x的代码中，原厂已经增加了上电开短路自测的功能，需要把接口映射出来给EOL测试。
总体流程如下：
下发自检命令，读取自检结果-》复位IC-》读取自诊断结果#ifdef SELF_TEST_ENABLE static int current_self_test_status = 1; static int current_self_result = GTP_SELT_TEST_WAIT_FOR_RESPONSE; static int current_self_result_oc = GTP_SELT_TEST_WAIT_FOR_RESPONSE; struct goodix_ts_data *Self_ts; /******************************************************* * Function: * Short current test result get //获取短路测试自检结果 * Input: * ts: goodix tp private data * Output: * . *********************************************************/ static int gtp_sc_handler(struct goodix_ts_data *ts) { u8 doze_buf[3] = {GTP_REG_SC_TEST_STATE >> 8, GTP_REG_SC_TEST_STATE & 0xFF}; int ret; dev_info(&ts->client->dev, "enter gtp_sc_handler\n"); ret = gtp_i2c_read(ts->client, doze_buf, 3); if (ret < 0) { dev_err(&ts->client->dev, "Failed read doze buf"); current_self_result = GTP_ERROR_TIMEOUT; return -EINVAL; } if(doze_buf[2] == 0x88){ doze_buf[0] = GTP_REG_SC_TEST_RESULT >> 8; doze_buf[1] = GTP_REG_SC_TEST_RESULT & 0xff; dev_info(&ts->client->dev, "Short current test complete\n"); } else{ int i = 5; while(i--){ /* Write for a moment */ usleep_range(10000,11000); doze_buf[0] = GTP_REG_SC_TEST_STATE >> 8; doze_buf[1] = GTP_REG_SC_TEST_STATE & 0xff; ret = gtp_i2c_read(ts->client, doze_buf, 3); if (ret < 0) { dev_err(&ts->client->dev, "Failed read doze buf"); current_self_result = GTP_ERROR_TIMEOUT; return -EINVAL; } if(doze_buf[2] == 0x88){ doze_buf[0] = GTP_REG_SC_TEST_RESULT >> 8; doze_buf[1] = GTP_REG_SC_TEST_RESULT & 0xff; break; } else{ dev_err(&ts->client->dev, "Short current test state is %02x\n",doze_buf[2]); } } if(i == 0){ current_self_result = GTP_ERROR_TIMEOUT; dev_err(&ts->client->dev, "sc error code %d\n",doze_buf[2]); return -EINVAL; } } ret = gtp_i2c_read(ts->client, doze_buf, 3); if (ret < 0) { dev_err(&ts->client->dev, "Failed read doze buf"); return -EINVAL; } if(doze_buf[2] != 0){ current_self_result = GTP_ERROR_SELF_TEST_ANALOG; dev_err(&ts->client->dev, "sc error code %d\n",doze_buf[2]); } else{ current_self_result = GTP_SELF_TEST_SUCCESS; } ts->pdata->short_current_test = false; return 0; } /******************************************************* * Function: * open current test result get //获取开路测试自检结果 * Input: * ts: goodix tp private data * Output: * . *********************************************************/ static int gtp_oc_handler(struct goodix_ts_data *ts) { u8 doze_buf[3] = {GTP_REG_OC_TEST_RESULT >> 8, GTP_REG_OC_TEST_RESULT & 0xFF}; int ret; dev_info(&ts->client->dev, "enter gtp_oc_handler\n"); ret = gtp_i2c_read(ts->client, doze_buf, 3); if (ret < 0) { dev_err(&ts->client->dev, "Failed read doze buf"); current_self_result_oc = GTP_ERROR_TIMEOUT; return -EINVAL; } if(doze_buf[2] != 0x00){ dev_err(&ts->client->dev, "TP open current\n"); current_self_result_oc = GTP_ERROR_OPEN_CURRENT; doze_buf[0] = GTP_REG_OC_TEST_RESULT >> 8; doze_buf[1] = GTP_REG_OC_TEST_RESULT & 0xff; doze_buf[2] = 0; gtp_i2c_write(ts->client, doze_buf, 3); } else{ current_self_result_oc = GTP_SELF_TEST_SUCCESS; } ts->pdata->open_current_test = false; return 0; } #endif /******************************************************* * Function: * Goodix touchscreen sensor report function * Input: * ts: goodix tp private data * Output: * None. *********************************************************/ static void gtp_work_func(struct goodix_ts_data *ts) { u8 point_state = 0; int key_value = 0; s32 i = 0; s32 ret = -1; static int pre_key; struct goodix_point_t points[GTP_MAX_TOUCH_ID]; #ifdef SELF_TEST_ENABLE /* Short current test result event */ if(ts->pdata->short_current_test ){ gtp_sc_handler(ts); } if(ts->pdata->open_current_test ){ gtp_oc_handler(ts); gtp_reset_guitar(ts->client, 20); return; } #endif ...... } /******************************************************* * Function: * Enter doze mode for sliding wakeup. * Input: * ts: goodix tp private data * Output: * 1: succeed, otherwise failed *******************************************************/ static int gtp_enter_doze(struct goodix_ts_data *ts) { int ret = -1; int retry = 0; u8 i2c_control_buf[3] = { (u8)(GTP_REG_COMMAND >> 8), (u8)GTP_REG_COMMAND, 8 }; /* resend doze command * if (test_and_set_bit(DOZE_MODE, &ts->flags)) { * dev_info(&ts->client->dev, "Already in doze mode\n"); * return SUCCESS; * } */ set_bit(DOZE_MODE, &ts->flags); dev_dbg(&ts->client->dev, "Entering gesture mode."); while (retry++ < 5) { i2c_control_buf[0] = (u8)(GTP_REG_COMMAND_CHECK >> 8); i2c_control_buf[1] = (u8)GTP_REG_COMMAND_CHECK; ret = gtp_i2c_write(ts->client, i2c_control_buf, 3); if (ret < 0) { dev_dbg(&ts->client->dev, "failed to set doze flag into 0x8046, %d\n", retry); continue; } i2c_control_buf[0] = (u8)(GTP_REG_COMMAND >> 8); i2c_control_buf[1] = (u8)GTP_REG_COMMAND; ret = gtp_i2c_write(ts->client, i2c_control_buf, 3); if (ret > 0) { dev_dbg(&ts->client->dev, "Gesture mode enabled\n"); return ret; } usleep_range(10000, 11000); } dev_err(&ts->client->dev, "Failed enter doze mode\n"); clear_bit(DOZE_MODE, &ts->flags); return ret; } /* short current test start cmd */ static s8 gtp_sc_test_start(struct goodix_ts_data *ts) { s8 ret = -1; s8 retry = 0; u8 i2c_control_buf[12] = { (u8)(GTP_REG_COMMAND_SC_TEST >> 8), (u8)GTP_REG_COMMAND_SC_TEST, 0 }; /* Read the state */ while (retry++ < 20){ ret = gtp_i2c_read(ts->client, i2c_control_buf, 3); if (ret > 0) { if(i2c_control_buf[2] == 0xaa){ dev_info(&ts->client->dev, "TP enter to selftest mode successful\n"); i2c_control_buf[2] = 0; break; } else{ dev_info(&ts->client->dev, "TP is not in selftest mode, %02x\n", i2c_control_buf[2]); } } else{ dev_err(&ts->client->dev, "iic read error\n"); } usleep_range(30000, 31000); } #ifdef SELF_TEST_ENABLE static int do_goodix_self_test(void) { s8 ret; /* Send cmd to touch ic to enter self test mode */ ret = gtp_enter_doze(Self_ts);//执行切换自检固件 usleep_range(30000, 31000); /* Send start short current test cmd to touch ic */ ret = gtp_sc_test_start(Self_ts);//进入自检流程 Self_ts->pdata->short_current_test= true; Self_ts->pdata->open_current_test = true; return 1; } static ssize_t set_self_test_status(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { unsigned long test_status; if (kstrtoul(buf, 10, &test_status)) { dev_info(dev, "invalid input!!!\n"); return 1; } current_self_test_status = test_status; dev_info(dev, "set touch IC self test mode to %d\n", current_self_test_status); if (current_self_test_status == 0) { current_self_result = GTP_SELT_TEST_WAIT_FOR_RESPONSE; //current_self_result_oc = GTP_SELF_TEST_SUCCESS; do_goodix_self_test(); } return count; } static ssize_t get_self_test_status(struct device *dev, struct device_attribute *attr, char *buf) { int len; len = snprintf(buf, PAGE_SIZE, "%d", current_self_test_status); dev_info(dev, "get self test state is %d, %d\n", current_self_test_status, len); return len; } static DEVICE_ATTR(self_test_mode, S_IRUGO | S_IWUSR, get_self_test_status, set_self_test_status); static ssize_t set_self_test_result(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { return count; } static ssize_t get_self_test_result(struct device *dev, struct device_attribute *attr, char *buf) { int len; int result; result = current_self_result || current_self_result_oc; len = snprintf(buf, PAGE_SIZE, "%d", result); //Self_ts->pdata->open_current_test = true; dev_info(dev, "Get self test state is %d\n", current_self_result); return len; } static DEVICE_ATTR(self_test_result, S_IRUGO | S_IWUSR, get_self_test_result, set_self_test_result); #endif static struct attribute *gtp_attrs[] = { &dev_attr_workmode.attr, &dev_attr_productinfo.attr, #ifdef CONFIG_TOUCHSCREEN_GA657X_UPDATE &dev_attr_dofwupdate.attr, #endif #ifdef SELF_TEST_ENABLE &dev_attr_self_test_result.attr, &dev_attr_self_test_mode.attr, #endif &dev_attr_drv_irq.attr, &dev_attr_reset.attr, NULL }; static const struct attribute_group gtp_attr_group = { .attrs = gtp_attrs, };- 1
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- 原文地址：https://blog.csdn.net/UUUUUltraman/article/details/126468209
