一、将Tiny6410一线触摸程序改成输入设备(input device)
由于友善一线触摸下位机不开源，所以只能在官方提供的内核模块上进行修改。
官方源代码：http://pan.baidu.com/s/1bog4rZD
1、修改模块加载函数
1 static int __init dev_init(void) 2 { 3 int ret; 4 #ifdef TS_INPUT_DRIVER 5 /* alloc input system device */ 6 ts.input = input_allocate_device(); 7 8 ts.input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); 9 ts.input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 10 11 input_set_abs_params(ts.input, ABS_X, 0, 0xFFFF, 0, 0); 12 input_set_abs_params(ts.input, ABS_Y, 0, 0xFFFF, 0, 0); 13 14 ts.input->name = "Tiny6410 TouchScreen"; 15 ts.input->id.bustype = BUS_HOST; 16 ts.input->id.vendor = 0xDEAD; 17 ts.input->id.product = 0xBEEF; 18 ts.input->id.version = 0x0102; 19 20 21 set_pin_up(); 22 set_pin_value(1); 23 set_pin_as_output(); 24 setup_irq(IRQ_TIMER3, &timer_for_1wire_irq); 25 ret = init_timer_for_1wire(); 26 if(ret < 0) 27 { 28 printk(TOUCH_DEVICE_NAME"timer init failed "); 29 goto timer_err; 30 } 31 init_timer(&one_wire_timer); 32 one_wire_timer_proc(0); 33 create_proc_read_entry("driver/one-wire-info", 0, NULL, read_proc, NULL); 34 35 /* register to the input system */ 36 ret = input_register_device(ts.input); 37 if(ret < 0) 38 { 39 printk(TOUCH_DEVICE_NAME"failed to register input device "); 40 goto timer_err; 41 } 42 43 return 0; 44 timer_err: 45 free_irq(IRQ_TIMER3, &timer_for_1wire_irq); 46 47 #else 48 49 ret = misc_register(&ts_misc) | misc_register(&bl_misc) ; 50 set_pin_up(); 51 set_pin_value(1); 52 set_pin_as_output(); 53 54 if (ret == 0) { 55 setup_irq(IRQ_TIMER3, &timer_for_1wire_irq); 56 ret = init_timer_for_1wire(); 57 init_timer(&one_wire_timer); 58 one_wire_timer_proc(0); 59 create_proc_read_entry("driver/one-wire-info", 0, NULL, read_proc, NULL); 60 } 61 62 if (ret == 0) { 63 printk (TOUCH_DEVICE_NAME" initialized "); 64 printk (BACKLIGHT_DEVICE_NAME" initialized "); 65 } 66 #endif 67 68 return ret; 69 }
在这个函数中提交输入的事件EV_KEY、EV_ABS、BTN_TOUCH，并注册输入设备到系统。
2、向输入子系统报告输入事件
修改源代码notify_ts_data()函数：
1 static inline void notify_ts_data(unsigned x, unsigned y, unsigned down) 2 { 3 if (!down && !(ts_status &(1U << 31))) { 4 // up repeat, give it up 5 #ifdef TS_INPUT_DRIVER 6 input_report_key(ts.input, BTN_TOUCH, 0); 7 input_sync(ts.input); 8 #endif 9 return; 10 } 11 #ifdef TS_INPUT_DRIVER 12 ts.xp = x; 13 ts.yp = y; 14 //printk("ts.xp = %ld,ts.yp = %ld ",ts.xp,ts.yp); 15 input_report_abs(ts.input, ABS_X, ts.xp); 16 input_report_abs(ts.input, ABS_Y, ts.yp); 17 18 input_report_key(ts.input, BTN_TOUCH, 1); 19 input_sync(ts.input); 20 #else 21 ts_status = ((x << 16) | (y)) | (down << 31); 22 ts_ready = 1; 23 wake_up_interruptible(&ts_waitq); 24 #endif 25 }
这个函数在按键按下时向输入子系统报告X/Y轴坐标的AD值和按键按下标志，在按键释放时报告按键释放标志。
3、修改模块卸载函数
1 static void __exit dev_exit(void) 2 { 3 exitting = 1; 4 #ifdef TS_INPUT_DRIVER 5 input_unregister_device(ts.input); 6 #endif 7 remove_proc_entry("driver/one-wire-info", NULL); 8 del_timer_sync(&one_wire_timer); 9 free_irq(IRQ_TIMER3, &timer_for_1wire_irq); 10 #ifndef TS_INPUT_DRIVER 11 misc_deregister(&ts_misc); 12 misc_deregister(&bl_misc); 13 #endif 14 }
在模块卸载函数中卸载输入设备。
二、移植tslib到开发板
tslib源码下载：http://pan.baidu.com/s/1qXuqPdU
编译工具：arm-linux-gcc
1、下载源码并解压
tar xzbf tslib-1.4.tar.gz
2、修改源码
打开源码tslib/plugins/input-raw.c文件
首先修改check_fd()函数，由于设备驱动没有用到ioctl，所以这个检测函数直接返回0。但是设备驱动用到了同步所以要把using_syn = 1:
1 static int check_fd(struct tslib_input *i) 2 { 3 struct tsdev *ts = i->module.dev; 4 int version; 5 u_int32_t bit; 6 u_int64_t absbit; 7 /* 8 if (! ((ioctl(ts->fd, EVIOCGVERSION, &version) >= 0) && 9 (version == EV_VERSION) && 10 (ioctl(ts->fd, EVIOCGBIT(0, sizeof(bit) * 8), &bit) >= 0) && 11 (bit & (1 << EV_ABS)) && 12 (ioctl(ts->fd, EVIOCGBIT(EV_ABS, sizeof(absbit) * 8), &absbit) >= 0) && 13 (absbit & (1 << ABS_X)) && 14 (absbit & (1 << ABS_Y)) && (absbit & (1 << ABS_PRESSURE)))) { 15 fprintf(stderr, "selected device is not a touchscreen I understand "); 16 return -1; 17 } 18 */ 19 printf("selected device! "); 20 //if (bit & (1 << EV_SYN)) 21 i->using_syn = 1; 22 23 return 0; 24 }
修改ts_input_read()函数，根据设备驱动程序可以知道，设备驱动提交BTN_TOUCH表示触摸屏有无按下，且设备驱动没有提交ABS_PRESSURE
1 static int ts_input_read(struct tslib_module_info *inf, 2 struct ts_sample *samp, int nr) 3 { 4 struct tslib_input *i = (struct tslib_input *)inf; 5 struct tsdev *ts = inf->dev; 6 struct input_event ev; 7 int ret = nr; 8 int total = 0; 9 10 if (i->sane_fd == 0) 11 i->sane_fd = check_fd(i); 12 13 if (i->sane_fd == -1) 14 return 0; 15 16 if (i->using_syn) { 17 while (total < nr) 18 { 19 ret = read(ts->fd, &ev, sizeof(struct input_event)); 20 if (ret < (int)sizeof(struct input_event)) { 21 total = -1; 22 break; 23 } 24 switch (ev.type) 25 { 26 case EV_KEY: 27 switch (ev.code) 28 { 29 case BTN_TOUCH: 30 if (ev.value == 0) 31 { 32 /* pen up */ 33 samp->x = 0; 34 samp->y = 0; 35 //samp->pressure = 0; 36 i->current_p = 0; 37 samp->tv = ev.time; 38 //samp++; 39 //total++; 40 printf("key_up "); 41 } 42 else if(ev.value == 1) 43 { 44 i->current_p = 1; 45 printf("key_down "); 46 } 47 break; 48 } 49 break; 50 case EV_SYN: 51 /* Fill out a new complete event */ 52 samp->x = i->current_x; 53 samp->y = i->current_y; 54 samp->pressure = i->current_p; 55 samp->tv = ev.time; 56 #ifdef DEBUG 57 fprintf(stderr, "RAW---------------------> %d %d %d %d.%d ", 58 samp->x, samp->y, samp->pressure, samp->tv.tv_sec, 59 samp->tv.tv_usec); 60 #endif /*DEBUG*/ 61 samp++; 62 total++; 63 break; 64 case EV_ABS: 65 switch (ev.code) 66 { 67 case ABS_X: 68 i->current_x = ev.value; 69 break; 70 case ABS_Y: 71 i->current_y = ev.value; 72 break; 73 /* 74 case ABS_PRESSURE: 75 i->current_p = ev.value; 76 break; 77 */ 78 } 79 break; 80 } 81 } 82 ret = total; 83 } 84 return ret; 85 }
红色为修改的地方，修改之后保存退出。
3、安装
# ./autogen.sh #./configure --host=arm-linux ac_cv_func_malloc_0_nonnull=yes --cache-file=arm-linux.cache -prefix=/usr/local/tslib # make # sudo make install
-prefix=/usr/local/tslib 表示安装的路径
./autogen.sh可能会报错：
ming@ubuntu:~/windowsshar/tslib$ ./autogen.sh ./autogen.sh: 4: ./autogen.sh: autoreconf: not found
解决办法：
1 sudo apt-get install automake 2 sudo apt-get install autogen 3 sudo apt-get install autoconf
4、修改配置文件
sudo vim /usr/local/tslib/etc/ts.conf
把第二行module_raw input前面的#号去掉(注意顶格)。
5、把/usr/local/下面编译好的tslib文件拷贝到开发板目录的/usr/local目录下(usr下面没有local文件夹就创建一个)
sudo cp -r /usr/local/tslib xxx/usr/local/
6、打开开发板/etc/profile文件
vi /etc/profile
在文件后面添加下面内容：
1 export TSLIB_ROOT=/usr/local/tslib 2 export TSLIB_TSDEVICE=/dev/event1 3 export TSLIB_CONFFILE=$TSLIB_ROOT/etc/ts.conf 4 export TSLIB_PLUGINDIR=$TSLIB_ROOT/lib/ts 5 export TSLIB_CALIBFILE=/etc/pointercal 6 export TSLIB_CONSOLEDEVICE=none 7 export TSLIB_FBDEVICE=/dev/fb0 8 export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$TSLIB_ROOT/lib
TSLIB_TSDEVICE=/dev/event1指明触摸屏设备，我的为/dev/event1
export TSLIB_FBDEVICE=/dev/fb0指明液晶显示设备
7、重启开发板(因为修改了profile，这个操作是必须的。当然也可以用source命令)
8、进入开发板/usr/local/tslib/bin目录，运行ts_calibrate程序进行屏幕校准。
1 cd /usr/local/tslib/bin/ 2 ./ts_calibrate
结果出现下面问题：
-/bin/sh: ./ts_calibrate: not found
在Linux系统下用arm-linux-readelf查看下ts_calibreate运行所需要的库：
1 ming@ubuntu:~/windowsshar/nfs/rootfs/usr/local/tslib/bin$ arm-linux-readelf -d ts_calibrate 2 3 Dynamic section at offset 0x2ef8 contains 28 entries: 4 Tag Type Name/Value 5 0x00000001 (NEEDED) Shared library: [libts-0.0.so.0] 6 0x00000001 (NEEDED) Shared library: [libdl.so.2] 7 0x00000001 (NEEDED) Shared library: [libc.so.6] 8 0x0000000f (RPATH) Library rpath: [/usr/local/tslib/lib] 9 0x0000001d (RUNPATH) Library runpath: [/usr/local/tslib/lib]
发现需要三个库libts-0.0.so.0 libdl.so.2 libc.so.6 ，其中libts-0.0.so.0是tslib自己提供的，所以需要从arm-linux-gcc里面的arm-none-linux-gnueabi/lib下面拷贝后两个库到开发板/lib目录下：
1 cd xxx/arm-liunx-gcc/xxx/arm-none-linux-gnueabi/lib 2 sudo cp libdl.so.2 libc.so.6 xxx/lib
再次运行ts_calibrate程序，还是一样的问题，再用arm-linux-readelf查看下ts_calibreate运行所需要的库：
1 ming@ubuntu:~/windowsshar/nfs/rootfs/usr/local/tslib/bin$ arm-linux-readelf -a ts_calibrate | grep "lib" 2 [Requesting program interpreter: /lib/ld-linux.so.3] 3 0x00000001 (NEEDED) Shared library: [libts-0.0.so.0] 4 0x00000001 (NEEDED) Shared library: [libdl.so.2] 5 0x00000001 (NEEDED) Shared library: [libc.so.6] 6 0x0000000f (RPATH) Library rpath: [/usr/local/tslib/lib] 7 0x0000001d (RUNPATH) Library runpath: [/usr/local/tslib/lib]
换一种方式，直接筛选"lib"，发现还有一个库没有拷贝ld-linux.so.3，把这个库也拷贝进去：
cd xxx/arm-liunx-gcc/xxx/arm-none-linux-gnueabi/lib sudo cp ld-linux.so.3 xxx/lib
再次运行，成功！
校准完成之后运行ts_test程序
