【Linux高级驱动】触摸屏驱动的移植

触摸屏驱动的移植

流程

注意:看框架图

1.添加input.c组件

Device Drivers  --->
 Input device support  --->
  Generic input layer (needed for keyboard, mouse, ...)

2.添加evdev.c组件

Device Drivers  --->
 Input device support  --->
  <*>   Event interface

3.添加s3c2410_ts.c触摸屏驱动

    修改driver/input/touchscreen/Kconfig

config TOUCHSCREEN_S3C2410
         tristate "Samsung S3C2410/generic touchscreen input driver"
         depends on ARCH_S3C2410 || SAMSUNG_DEV_TS || ARCH_S5PC100  //后面的ARCH_S5PC100为新添加的
         select S3C_ADC
         help
           Say Y here if you have the s3c2410 touchscreen.
           If unsure, say N.To compile this driver as a module, choose M here: the
           module will be called s3c2410_ts

    配置内核选项

Device Drivers--->
 Input device support  --->
   -*- Generic input layer (needed for keyboard, mouse, ...)
   [*] Touchscreens  --->
        <*>Samsung S3C2410/generic touchscreen input driver

4.添加设备资源(dev-ts.c)

    vi arch/arm/mach-s5pc100/Kconfig

config MACH_SMDKC100
          bool "SMDKC100"
          select CPU_S5PC100
          select S3C_DEV_FB
          select S3C_DEV_I2C1
          select S3C_DEV_HSMMC
          select S3C_DEV_HSMMC1
  　      select S3C_DEV_HSMMC2
          select S5PC100_SETUP_FB_24BPP
          select S5PC100_SETUP_I2C1
          select S5PC100_SETUP_SDHCI
          select S3C_DEV_LED
          select S3C_DEV_RTC
      　　 select SAMSUNG_DEV_TS    //添加的内容
        help
           Machine support for the Samsung SMDKC100

    vi arch/arm/mach-s5pc100/mach-smdkc100.c

#include<plat/ts.h>
/*ts*/
struct s3c2410_ts_mach_info s5pc_tscfg ={
 .delay =200000,
 .oversampling_shift =2,
};
static struct platform_device *smdkc100_devices[] __initdata = {
         &s3c_device_i2c0,
         &s3c_device_i2c1,
         &s3c_device_fb,
         &s3c_device_hsmmc0,
         &s3c_device_hsmmc1,
         &s3c_device_hsmmc2,
         &smdkc100_lcd_powerdev,
         &s5pc100_device_iis0,
         &s5pc100_device_ac97,
 
 #ifdef  CONFIG_DM9000
         &s5pc100_device_dm9000,
 #endif
 
  &fsled_device,
         &s3c_device_rtc,
         &s3c_device_ts,    //添加的内容
 };
 
static void __init smdkc100_machine_init(void)
{
 ...
 s3c24xx_ts_set_platdata(&s5pc_tscfg);     //s3c_device_ts.dev.platform_data =&s5pc_tscfg 
 ...
}

5.修改头文件

    vi arch/arm/mach-s5pc100/include/mach/map.h

6.添加adc资源(dev-adc.c)

    vi arch/arm/mach-s5pc100/Kconfig

config MACH_SMDKC100
          bool "SMDKC100"
          select CPU_S5PC100
          select S3C_DEV_FB
          select S3C_DEV_I2C1
          select S3C_DEV_HSMMC
          select S3C_DEV_HSMMC1
  　select S3C_DEV_HSMMC2
          select S5PC100_SETUP_FB_24BPP
          select S5PC100_SETUP_I2C1
          select S5PC100_SETUP_SDHCI
          select S3C_DEV_LED
          select S3C_DEV_RTC
  　select SAMSUNG_DEV_TS    
    select SAMSUNG_DEV_ADC //添加的内容
        help
           Machine support for the Samsung SMDKC100

    vi arch/arm/mach-s5pc100/mach-smdkc100.c

static struct platform_device *smdkc100_devices[] __initdata = {
         &s3c_device_i2c0,
         &s3c_device_i2c1,
         &s3c_device_fb,
         &s3c_device_hsmmc0,
         &s3c_device_hsmmc1,
         &s3c_device_hsmmc2,
         &smdkc100_lcd_powerdev,
         &s5pc100_device_iis0,
         &s5pc100_device_ac97,
 
 #ifdef  CONFIG_DM9000
         &s5pc100_device_dm9000,
 #endif
 
   &fsled_device,
         &s3c_device_rtc,
         &s3c_device_ts,    
   &s3c_device_adc //添加的内容 
 };

测试方式

测试方法1.驱动调试

    在触摸屏驱动中s3c2410_ts.c文件的,触摸屏中断服务程序中添加如下代码

static irqreturn_t stylus_irq(int irq, void *dev_id)
{
 printk(KERN_INFO "%s():%d ",__func__,__LINE__);
 ...
}

    当点击触摸屏的时候,出现如下现象:

stylus_irq():164
s3c_adc_start: failed to find adc  //找不到ADC

    问题解决:分析s3c_adc_start函数

struct adc_device *adc = adc_dev;  //说明adc_dev为空
if (!adc) {
 printk(KERN_ERR "%s: failed to find adc ", __func__);
 return -EINVAL;
}

    搜索adc_dev

int s3c_adc_probe(struct platform_device *pdev)   //由此可见,probe函数没执行,猜测,匹配不成功
 adc_dev = adc;
static struct platform_device_id s3c_adc_driver_ids[] = {
 {
  .name           = "s3c24xx-adc",
  .driver_data    = TYPE_S3C24XX,
 },{
  .name           = "s3c64xx-adc",
  .driver_data    = TYPE_S3C64XX,
 },
 { }
};
static struct platform_driver s3c_adc_driver = {
 .id_table = s3c_adc_driver_ids,   //按id.name匹配
 .driver  = {
  .name = "s3c-adc",
  .owner = THIS_MODULE,
 },
 .probe  = s3c_adc_probe,
 .remove  = __devexit_p(s3c_adc_remove),
 .suspend = s3c_adc_suspend,
 .resume  = s3c_adc_resume,
};

    但是在dev-adc.c文件

struct platform_device s3c_device_adc = {
 .name  = "samsung-adc",
 .id  = -1,
 .num_resources = ARRAY_SIZE(s3c_adc_resource),
 .resource = s3c_adc_resource,
};

    解决方法:

static struct platform_device_id s3c_adc_driver_ids[] = {
 {
  .name           = "s3c24xx-adc",
  .driver_data    = TYPE_S3C24XX,
 },{
  .name           = "s3c64xx-adc",
  .driver_data    = TYPE_S3C64XX,
 },{
  .name           = "samsung-adc",
  .driver_data    = TYPE_S3C64XX,
 },
 { }
};

 

测试方法2:移植tslib库:校准程序

2.1 tslib库的移植

    1.拷贝tslib-1.4.tar.gz到ubutun的工作目录，如/home/jason/project

    2.解压缩
        tar -xvf tslib-1.4.tar.gz

    3.配置

 sudo apt-get install autoconf
 sudo apt-get install libtool
 cd tslib
 ./autogen.sh
 mkdir tmp
 echo "ac_cv_func_mallo_0_nonnull=yes">arm-unknown-linux-gnueabi.cache
 ./configure --host=arm-unknown-linux-gnueabi --prefix=$(pwd)/tmp --cache-file=arm-unknown-linux-gnueabi.cache

    4.编译(make)

make的时候会出现如下错误:
 ts_test.c:(.text+0x1e4): undefined reference to `rpl_malloc'
 解决方法:将config.h.in里的 #undef malloc屏蔽掉  

    5.安装
      make install

    6.cd tmp 
      cp * /opt/rootfs 

    7.cd /opt/rootfs/lib
      mkdir ts

    8.cp tslib/plugins  /opt/wlwfs/lib/ts

    9.修改/opt/wlwfs/etc/ts.conf第一行（去掉#号和第一个空格）
      #module_raw input
      改为
      module_raw input

    10.修改etc/profile文件
      vi  etc/profile
      在其中添加如下代码

export TSLIB_TSDEVICE=/dev/event0   
export TSLIB_CALIBFILE=/etc/pointercal
export TSLIB_CONFFILE=/etc/ts.conf
export TSLIB_PLUGINDIR=/lib/ts
export TSLIB_CONSOLEDEVICE=/dev/tty
export TSLIB_FBDEVICE=/dev/fb0    //lcd   

    记得执行：
        source etc/profile

2.2 移植LCD驱动

    vi linux-2.6.35.5/driver/video/Kconfig

config FB_S3C
         tristate "Samsung S3C framebuffer support"
         depends on FB && (ARCH_S3C64XX || ARCH_S5PC100(新添加的))
         select FB_CFB_FILLRECT
         select FB_CFB_COPYAREA
         select FB_CFB_IMAGEBLIT
         ---help---
           Frame buffer driver for the built-in FB controller in the Samsung
           SoC line from the S3C2443 onwards, including the S3C2416, S3C2450,
           and the S3C64XX series such as the S3C6400 and S3C6410.
           These chips all have the same basic framebuffer design with the
           actual capabilities depending on the chip. For instance the S3C6400
           and S3C6410 support 4 hardware windows whereas the S3C24XX series
           currently only have two.
           Currently the support is only for the S3C6400 and S3C6410 SoCs.

    make menuconfig

Location:                                                                                               x
      -> Device Drivers                                                                                     x
         -> Graphics support                                                                                 x
           <*> Support for frame buffer devices  --->
   <*>   Samsung S3C framebuffer support   //配置LCD的驱动
     Console display driver support  --->
   <*> Framebuffer Console support
     [*] Bootup logo  --->    //系统中的默认logo 
  [*]   Standard 224-color Linux logo (NEW)

    编译内核:
        make zImage

2.3 运行tslib库

ts_calibrate    //在LCD上出现一个点
xres = 800, yres = 480   //现象
selected device is not a touchscreen I understand

    问题1:屏幕大小不对(480*272)
    问题2:tslib库认为我们的设备不是触摸屏设备

解决问题1:

    修改大小 
    vi arch/arm/mach_s5pc100/mach_smdkc100.c

/* Frame Buffer */
static struct s3c_fb_pd_win smdkc100_fb_win0 = {
         /* this is to ensure we use win0 */
         .win_mode       = {
                 .pixclock = 1000000000000ULL / ((8+13+3+800)*(7+5+1+480)*80),
                 .left_margin    = 8,
                 .right_margin   = 13,
                 .upper_margin   = 7,
                 .lower_margin   = 5,
                 .hsync_len      = 3,
                 .vsync_len      = 1,
                 .xres           = 800,  //480
                 .yres           = 480,  //272
         },
         .max_bpp        = 32,
         .default_bpp    = 16,
};

解决问题2：

    到tslib库里面,搜索selected device is not a touchscreen I understand看它怎么样认为才是一个触摸屏设备

    plugins/input-raw.c:61:         fprintf(stderr, "selected device is not a touchscreen I understand ");
    vi plugins/input-raw.c +61

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 ");
          }

    由上面的代码可知,触摸屏应该还要产生压力事件
    所以,我们应该修改触摸屏驱动,
    vi driver/input/touchsrceen/s3c2410_ts.c

static int __devinit s3c2410ts_probe(struct platform_device *pdev)
{
 ...
 ...
 input_set_abs_params(ts.input, ABS_X, 0, 480, 0, 0);
 input_set_abs_params(ts.input, ABS_Y, 0, 272, 0, 0);
 input_set_abs_params(ts.input, ABS_PRESSURE, 0, 1, 0, 0);   //新添加的
 ...
 ...
}
static void touch_timer_fire(unsigned long data)
{
 ...
 ...
 input_report_abs(ts.input, ABS_X, ts.xp);
 input_report_abs(ts.input, ABS_Y, ts.yp);
 input_report_abs(ts.input, ABS_PRESSURE, 1); //添加的代码
 input_report_key(ts.input, BTN_TOUCH, 1);
 input_sync(ts.input);
 ...
 ...
}else{
 ...
 input_report_abs(ts.input, ABS_PRESSURE, 0); //添加的代码
 input_report_key(ts.input, BTN_TOUCH, 0);
 input_sync(ts.input);
 ...
}

2.4 再次运行tslib库

    ts_calibrate   //需要分别点击5次
    ts_test

@成鹏致远

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