Tiny6410移植tslib

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

static int __init dev_init(void)
{
    int ret;
#ifdef TS_INPUT_DRIVER
    /* alloc input system device */
    ts.input = input_allocate_device();
    
    ts.input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
    ts.input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
    
    input_set_abs_params(ts.input, ABS_X, 0, 0xFFFF, 0, 0);
    input_set_abs_params(ts.input, ABS_Y, 0, 0xFFFF, 0, 0);

    ts.input->name = "Tiny6410 TouchScreen";
    ts.input->id.bustype = BUS_HOST;
    ts.input->id.vendor = 0xDEAD;
    ts.input->id.product = 0xBEEF;
    ts.input->id.version = 0x0102;


    set_pin_up();
    set_pin_value(1);
    set_pin_as_output();
    setup_irq(IRQ_TIMER3, &timer_for_1wire_irq);
    ret = init_timer_for_1wire();
    if(ret < 0)
    {
        printk(TOUCH_DEVICE_NAME"timer init failed\n");
        goto timer_err;
    }
    init_timer(&one_wire_timer);
    one_wire_timer_proc(0);
    create_proc_read_entry("driver/one-wire-info", 0, NULL, read_proc, NULL);

    /* register to the input system */
    ret = input_register_device(ts.input);
    if(ret < 0)
    {
        printk(TOUCH_DEVICE_NAME"failed to register input device\n");
        goto timer_err;
    }
    
    return 0;
timer_err:
    free_irq(IRQ_TIMER3, &timer_for_1wire_irq);

#else

    ret = misc_register(&ts_misc) | misc_register(&bl_misc) ;
    set_pin_up();
    set_pin_value(1);
    set_pin_as_output();

    if (ret == 0) {
        setup_irq(IRQ_TIMER3, &timer_for_1wire_irq);
        ret = init_timer_for_1wire();
        init_timer(&one_wire_timer);
        one_wire_timer_proc(0);
        create_proc_read_entry("driver/one-wire-info", 0, NULL, read_proc, NULL);
    }
    
    if (ret == 0) {
        printk (TOUCH_DEVICE_NAME"\tinitialized\n");
        printk (BACKLIGHT_DEVICE_NAME"\tinitialized\n");
    }
#endif

    return ret;
}

 

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：

static inline void notify_ts_data(unsigned x, unsigned y, unsigned down)
{
    if (!down && !(ts_status &(1U << 31))) {
        // up repeat, give it up
#ifdef TS_INPUT_DRIVER
        input_report_key(ts.input, BTN_TOUCH, 0);
        input_sync(ts.input);
#endif
        return;
    }
#ifdef TS_INPUT_DRIVER
    ts.xp = x;
    ts.yp = y;
    //printk("ts.xp = %ld,ts.yp = %ld\n",ts.xp,ts.yp);
    input_report_abs(ts.input, ABS_X, ts.xp);
    input_report_abs(ts.input, ABS_Y, ts.yp);

    input_report_key(ts.input, BTN_TOUCH, 1);
    input_sync(ts.input);
#else
    ts_status = ((x << 16) | (y)) | (down << 31);
    ts_ready = 1;
    wake_up_interruptible(&ts_waitq);
#endif
}

 

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

static void __exit dev_exit(void)
{
    exitting = 1;
#ifdef TS_INPUT_DRIVER
    input_unregister_device(ts.input);
#endif
    remove_proc_entry("driver/one-wire-info", NULL);
    del_timer_sync(&one_wire_timer);
    free_irq(IRQ_TIMER3, &timer_for_1wire_irq);
#ifndef TS_INPUT_DRIVER
    misc_deregister(&ts_misc);
    misc_deregister(&bl_misc);
#endif
}

 

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:

static int check_fd(struct tslib_input *i)
{
    struct tsdev *ts = i->module.dev;
    int version;
    u_int32_t bit;
    u_int64_t absbit;
/*
    if (! ((ioctl(ts->fd, EVIOCGVERSION, &version) >= 0) &&
        (version == EV_VERSION) &&
        (ioctl(ts->fd, EVIOCGBIT(0, sizeof(bit) * 8), &bit) >= 0) &&
        (bit & (1 << EV_ABS)) &&
        (ioctl(ts->fd, EVIOCGBIT(EV_ABS, sizeof(absbit) * 8), &absbit) >= 0) &&
        (absbit & (1 << ABS_X)) &&
        (absbit & (1 << ABS_Y)) && (absbit & (1 << ABS_PRESSURE)))) {
        fprintf(stderr, "selected device is not a touchscreen I understand\n");
        return -1;
    }
*/
    printf("selected device!\n");
    //if (bit & (1 << EV_SYN))
        i->using_syn = 1;

    return 0;
}

 

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

static int ts_input_read(struct tslib_module_info *inf,
             struct ts_sample *samp, int nr)
{
    struct tslib_input *i = (struct tslib_input *)inf;
    struct tsdev *ts = inf->dev;
    struct input_event ev;
    int ret = nr;
    int total = 0;

    if (i->sane_fd == 0)
        i->sane_fd = check_fd(i);

    if (i->sane_fd == -1)
        return 0;

    if (i->using_syn) {
        while (total < nr) 
        {
            ret = read(ts->fd, &ev, sizeof(struct input_event));
            if (ret < (int)sizeof(struct input_event)) {
                total = -1;
                break;
            }
            switch (ev.type) 
            {
            case EV_KEY:
                switch (ev.code) 
                {
                case BTN_TOUCH:
                    if (ev.value == 0) 
                    {
                        /* pen up */
                        samp->x = 0;
                        samp->y = 0;
                        //samp->pressure = 0;
                        i->current_p = 0;
                        samp->tv = ev.time;
                        //samp++;
                        //total++;
                        printf("key_up\n");
                    }
42                     else if(ev.value == 1)
43                     {
44                         i->current_p = 1;
45                         printf("key_down\n");
46                     }
                    break;
                }
                break;
            case EV_SYN:
                /* Fill out a new complete event */
                samp->x = i->current_x;
                samp->y = i->current_y;
                samp->pressure = i->current_p;
                samp->tv = ev.time;
    #ifdef DEBUG
                fprintf(stderr, "RAW---------------------> %d %d %d %d.%d\n",
                        samp->x, samp->y, samp->pressure, samp->tv.tv_sec,
                        samp->tv.tv_usec);
    #endif         /*DEBUG*/
                samp++;
                total++;
                break;
            case EV_ABS:
                switch (ev.code) 
                {
                case ABS_X:
                    i->current_x = ev.value;
                    break;
                case ABS_Y:
                    i->current_y = ev.value;
                    break;
73                 /*
74                 case ABS_PRESSURE:
75                     i->current_p = ev.value;
76                     break;
77                 */
                }
                break;
            }
        }
        ret = total;
    } 
    return ret;
}

 

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：

sudo apt-get install automake
sudo apt-get install autogen
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：

export TSLIB_ROOT=/usr/local/tslib
export TSLIB_TSDEVICE=/dev/event1
export TSLIB_CONFFILE=$TSLIB_ROOT/etc/ts.conf
export TSLIB_PLUGINDIR=$TSLIB_ROOT/lib/ts
export TSLIB_CALIBFILE=/etc/pointercal
export TSLIB_CONSOLEDEVICE=none
export TSLIB_FBDEVICE=/dev/fb0
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。

cd /usr/local/tslib/bin/
./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：

ming@ubuntu:~/windowsshar/nfs/rootfs/usr/local/tslib/bin$ arm-linux-readelf -d ts_calibrate 

Dynamic section at offset 0x2ef8 contains 28 entries:
  Tag        Type                         Name/Value
 0x00000001 (NEEDED)                     Shared library: [libts-0.0.so.0]
 0x00000001 (NEEDED)                     Shared library: [libdl.so.2]
 0x00000001 (NEEDED)                     Shared library: [libc.so.6]
 0x0000000f (RPATH)                      Library rpath: [/usr/local/tslib/lib]
 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：

cd xxx/arm-liunx-gcc/xxx/arm-none-linux-gnueabi/lib
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：

ming@ubuntu:~/windowsshar/nfs/rootfs/usr/local/tslib/bin$ arm-linux-readelf -a ts_calibrate | grep "lib"
      [Requesting program interpreter: /lib/ld-linux.so.3]
 0x00000001 (NEEDED)                     Shared library: [libts-0.0.so.0]
 0x00000001 (NEEDED)                     Shared library: [libdl.so.2]
 0x00000001 (NEEDED)                     Shared library: [libc.so.6]
 0x0000000f (RPATH)                      Library rpath: [/usr/local/tslib/lib]
 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