/*************************************************************************          I.MX6 Goodix GT9xx touchscreen driver porting* 声明：*     本文主要是记录GT9xx电容Touch移植过程中遇到的一些问题。**                                      2016-1-27 深圳 南山平山村 曾剑锋***********************************************************************/一、参考文档：GT9XX驱动移植说明书_for_Android_2014011401.pdf二、error 1:1. 出错信息：1. 直接将驱动放在kernel里系统会卡死，出错信息如下：USB Gadget resume beginsfsl_udc_resume, Wait for wakeup thread finishesdr_controller_run: udc out low power modeUSB Gadget resume endsfsl-usb2-udc: bind to driver android_usb mousedev: PS/2 mouse device common for all miceinput: gpio-keys as /devices/platform/gpio-keys/input/input0<<-GTP-INFO->> GTP driver installing...<<-GTP-INFO->> GTP Driver Version: V2.4<2014/11/28><<-GTP-INFO->> GTP Driver Built@11:15:29, Jan 26 2016<<-GTP-INFO->> GTP I2C Address: 0x5d<<-GTP-INFO->> Guitar reset<<-GTP-INFO->> Chip Type: GOODIX_GT9<<-GTP-INFO->> IC Version: 9157_1040<<-GTP-INFO->> X_MAX: 720, Y_MAX: 1280, TRIGGER: 0x01<<-GTP-INFO->> create proc entry gt9xx_config successinput: goodix-ts as /devices/virtual/input/input1<<-GTP-INFO->> GTP works in interrupt mode.<<-GTP-INFO->> Applied memory size:2562.<<-GTP-INFO->> Applied memory size:2562.<<-GTP-INFO->> I2C function: without pre and end cmd!<<-GTP-INFO->> Create proc entry success!mtk_tpd: hotknot_device register failedUSB Gadget resume beginsfsl_udc_resume, Wait for wakeup thread finishesehci_fsl_bus_suspend begins, Host 1ehci_fsl_bus_suspend ends, Host 1<系统会卡死在这里，接下来没有任何信息输出>2. 作为模块加入内核，使用久了，系统也会卡死：root@android:/ # cd /data/localroot@android:/data/local # lsgt9xxm.kotmproot@android:/data/local # insmod gt9xxm.ko                                    <<-GTP-INFO->> GTP driver installing...<<-GTP-INFO->> GTP Driver Version: V2.4<2014/11/28><<-GTP-INFO->> GTP Driver Built@11:40:19, Jan 26 2016<<-GTP-INFO->> GTP I2C Address: 0x5d<<-GTP-INFO->> Guitar reset<<-GTP-INFO->> Chip Type: GOODIX_GT9<<-GTP-INFO->> IC Version: 9157_1040<<-GTP-INFO->> X_MAX: 720, Y_MAX: 1280, TRIGGER: 0x01<<-GTP-INFO->> create proc entry gt9xx_config successinput: goodix-ts as /devices/virtual/input/input1cpufreq_interactive_input_connect: connect to goodix-ts<<-GTP-INFO->> GTP works in interrupt mode.<<-GTP-INFO->> Applied memory size:2562.<<-GTP-INFO->> Applied memory size:2562.<<-GTP-INFO->> I2C function: without pre and end cmd!root@android:/data/local # <<-GTP-INFO->> Create proc entry success!mtk_tpd: hotknot_device register failed2. 解决方法：1. cat gt9xx.h......#define HOTKNOT_ENABLE        0    // hotknot module#define HOTKNOT_BLOCK_RW      0    // block rw operation in hotknot ......2. cat goodix_tool.cs32 init_wr_node(struct i2c_client *client){......#if 0if (misc_register(&hotknot_misc_device)){printk("mtk_tpd: hotknot_device register failed\n");return FAIL;}#endif......} 3. 思路来源：1. 想通过尽可能减少驱动的功能来判断驱动哪里出了问题。2. cat gt9xx.h......#define HOTKNOT_ENABLE        1    // hotknot module#define HOTKNOT_BLOCK_RW      1    // block rw operation in hotknot ......3. 如上所述，不需要该功能，当然我也不知道这是什么功能。4. 改为如下内容：#define HOTKNOT_ENABLE        0    // hotknot module#define HOTKNOT_BLOCK_RW      0    // block rw operation in hotknot 5. 报错如下：......CC      drivers/input/touchscreen/gt9xx.odrivers/input/touchscreen/gt9xx.c: In function 'goodix_ts_suspend':drivers/input/touchscreen/gt9xx.c:2735:5: warning: unused variable 'buf' [-Wunused-variable]CC      drivers/input/touchscreen/gt9xx_update.oCC      drivers/input/touchscreen/goodix_tool.odrivers/input/touchscreen/goodix_tool.c: In function 'init_wr_node':drivers/input/touchscreen/goodix_tool.c:346:21: error: 'hotknot_misc_device' undeclared (first use in this function)drivers/input/touchscreen/goodix_tool.c:346:21: note: each undeclared identifier is reported only once for each function it appears indrivers/input/touchscreen/goodix_tool.c: At top level:drivers/input/touchscreen/goodix_tool.c:855:16: warning: 'hotknot_write' defined but not used [-Wunused-function]drivers/input/touchscreen/goodix_tool.c:1243:16: warning: 'hotknot_read' defined but not used [-Wunused-function]make[3]: *** [drivers/input/touchscreen/goodix_tool.o] Error 1make[2]: *** [drivers/input/touchscreen] Error 2make[1]: *** [drivers/input] Error 2make: *** [drivers] Error 2error: make uImage failed../remake.sh: 18: exit: Illegal number: -16. 既然已经禁止了，那么不可能还有hotknot_misc_device设备注册的，也就意味着这个版本的驱动有错。7. 综上所述：可能是我们的kernel不支持hotknot这个功能导致的。三、error 2:1. 触摸屏点击有效，但是不准确，TP厂没有给矫正文件，后来FAE确认是由于矫正配置参数的问题。2. 修改gt9xx.h文件：......#define GTP_DRIVER_SEND_CFG   1......3. 配置参数：#define CTP_CFG_GROUP0 {\0x46,0xD0,0x02,0x00,0x05,0x0A,0x05,0x40,0x01,0x08,\0x28,0x0F,0x50,0x32,0x03,0x05,0x00,0x00,0x00,0x00,\0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x8A,0x0A,0x0B,\0x2E,0x30,0x31,0x0D,0x00,0x00,0x00,0x02,0x03,0x1D,\0x00,0x01,0x00,0x00,0x00,0x00,0x00,0x32,0x00,0x00,\0x00,0x21,0x41,0x94,0xC5,0x02,0x07,0x00,0x00,0x04,\0x9E,0x23,0x00,0x8D,0x28,0x00,0x80,0x2E,0x00,0x74,\0x35,0x00,0x69,0x3C,0x00,0x69,0x00,0x00,0x00,0x00,\0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,\0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,\0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,\0x00,0x00,0x16,0x14,0x12,0x10,0x0E,0x0C,0x0A,0x08,\0x06,0x04,0x02,0xFF,0xFF,0xFF,0x00,0x00,0x00,0x00,\0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,\0x00,0x00,0x16,0x13,0x18,0x12,0x1C,0x10,0x1D,0x0F,\0x0A,0x1E,0x00,0x24,0x22,0x02,0x21,0x04,0x20,0x06,\0x1F,0x08,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x00,0x00,\0x00,0xFB,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,\0x9F,0xFF,0xFF,0xFF,0x00,0x01\}