【Linux高級驅動】觸摸屏驅動的移植

觸摸屏驅動的移植

流程

注意:看框架圖

1.添加input.c組件

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

2.添加evdev.c組件

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

3.添加s3c2410_ts.c觸摸屏驅動

    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為新添加的
         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

    配置內核選項

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

4.添加設備資源(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     //添加的內容
        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,     //添加的內容
 };
 
static void __init smdkc100_machine_init( void)
{
 ...
 s3c24xx_ts_set_platdata( &s5pc_tscfg);      //s3c_device_ts.dev.platform_data =&s5pc_tscfg 
 ...
}

5.修改頭文件

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

6.添加adc資源(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 //添加的內容
        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 //添加的內容 
 };

 

測試方式

測試方法1.驅動調試

    在觸摸屏驅動中s3c2410_ts.c文件的,觸摸屏中斷服務程序中添加如下代碼

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

    當點擊觸摸屏的時候,出現如下現象:

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

    問題解決:分析s3c_adc_start函數

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

    搜索adc_dev

int s3c_adc_probe( struct platform_device *pdev)    //由此可見,probe函數沒執行,猜測,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,
};

    解決方法:

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,
 },
 { }
};

 

測試方法2:移植tslib庫:校准程序

2.1 tslib庫的移植

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

    2.解壓縮
        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.編譯(make)

make的時候會出現如下錯誤 :
 ts_test.c :(.text +0x1e4) : undefined reference to `rpl_malloc '
 解決方法:將config.h.in里的 #undef malloc屏蔽掉  

    5.安裝
      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#號和第一個空格）
      #module_raw input
      改為
      module_raw input

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

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   

    記得執行：
        source etc/profile

2.2 移植LCD驅動

    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的驅動
     Console display driver support   -- - >
    < * > Framebuffer Console support
     [ *] Bootup logo   -- - >     / /系統中的默認logo 
  [ *]   Standard 224 -color Linux logo (NEW)

    編譯內核:
        make zImage

2.3 運行tslib庫

ts_calibrate     / /在LCD上出現一個點
xres = 800, yres = 480    / /現象
selected device is not a touchscreen I understand

    問題1:屏幕大小不對(480*272)
    問題2:tslib庫認為我們的設備不是觸摸屏設備

解決問題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,
};

解決問題2：

    到tslib庫里面,搜索selected device is not a touchscreen I understand看它怎么樣認為才是一個觸摸屏設備

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

    由上面的代碼可知,觸摸屏應該還要產生壓力事件
    所以,我們應該修改觸摸屏驅動,
    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); / /添加的代碼
 input_report_key(ts.input, BTN_TOUCH, 1);
 input_sync(ts.input);
 ...
 ...
} else{
 ...
 input_report_abs(ts.input, ABS_PRESSURE, 0); / /添加的代碼
 input_report_key(ts.input, BTN_TOUCH, 0);
 input_sync(ts.input);
 ...
}

2.4 再次運行tslib庫

    ts_calibrate   //需要分別點擊5次
    ts_test

 

@成鵬致遠

（blogs:http://lcw.cnblogs.com）

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