调试Android 2.2的wm8976的驱动用于支持3G的心得

 

现在由于公司要上手wm8976的芯片的支持，主要是用于3G的通话的通道的打开：

1：现在我们的构思就是，3G通话的平板电脑的输入是mic/mip 输入 然后由wm8976的LOUT3口输出到3G上面去，然后我们电话那头的说话声音是如何输入到平板的呐，就是3G模块的声音的输入是经过wm8976的AUX口的输入，然后是经过hp的输出，我们通过平板的耳机或者是喇叭就可以听见电话那头的声音

2：有与项目时间比较急，我就没有按照音频的标准驱动来做，就是上层调用下层驱动的标准方式，我是采用有3G的上层写proc来做的。

3：下面让我们看看我的一些代码吧

a:我在wm8976的驱动里面是如何建立proc的文件呐，细看哦！

/*********wangyulu add down******/
extern char sound_codec[];
 if(!strcmp(sound_codec, "wm8976")){

     #define MODEM_SWITCH_PROC_NAME "sound8976_galley_select"
     #define PROC_NAME "sound8976"
 extern struct proc_dir_entry proc_root;
 static struct proc_dir_entry *root_entry;
 static struct proc_dir_entry *entry;
 
 root_entry = proc_mkdir(PROC_NAME, &proc_root);
 s_proc = create_proc_entry(MODEM_SWITCH_PROC_NAME, 0666, root_entry);
 if (s_proc != NULL){
     s_proc->write_proc = modem_switch_writeproc;
     s_proc->read_proc = modem_switch_readproc;
 }
 }
 
//printk(KERN_INFO "Initializing wm8976_modinit...\n");
/********wangyulu add up********/

这是我在proc里面建立的文件，通过上层可以对proc的文件读和写就可以调用proc的读写函数，就可以达到上层调用下层驱动的目的。

b:呵呵，我向大家肯定是想问问proc的驱动的读写何在？别急来也！

extern int Sound_Flag;
static int sound8976_galley_select_flag = 0;

static  struct proc_dir_entry * s_proc = NULL;
static int modem_switch_writeproc(struct file *file,const char *buffer,
                           unsigned long count, void *data)
{
  int value;
  value = 0;
  sscanf(buffer, "%d", &value);
 switch(value)
 {
  case 0:
   wm8976_set_register_sound(value);
   break;
  case 1:
   wm8976_set_register_sound(value);
   break;
  default:
   //printk("************************wangyulu sound8976_galley_select_flag ==null***********************\n");
   break;
 }
 return count;
}

对于写函数主要是看看控制3G的java的代码是对proc的写的是1或是0就可以调用wm8976_set_register_sound(value);
函数了
static int modem_switch_readproc(char *page, char **start, off_t off,
     int count, int *eof, void *data)
{
 int len;
 len = sprintf(page, "%d\n", sound8976_galley_select_flag==0?0:(sound8976_galley_select_flag==1?1:(sound8976_galley_select_flag==2?2:3))); //wangyulu
 if (off + count >= len)
  *eof = 1; 
 if (len < off)
   return 0;
 *start = page + off;
 return ((count < len - off) ? count : len - off);
}

这就是proc驱动里面的读写函数

c：下面贴出我在上层做得事情：目的就是3G来电就是想proc写1 ，调用wm8976_set_register_sound(1);，打开wm8976的3G的声音输入输出通道。

    private static final String MODEM_MAYBE_PLUGED = "proc/sound8976/sound8976_galley_select"; //wangyulu
    //private static final String MODEM_MAYBE_PLUGED = "proc/sound5621/sound5621_galley_select"; //wangyulu
    private void updateScreen() {
         if (true) log("updateScreen()...");
         if (true) log("/*************************wangyulu updateScreen Phone ***************************/ ");
         File awakeTimeFile = new File("proc/sound8976/sound8976_galley_select");
   File awakeTimeFile5621 = new File("proc/sound5621/sound5621_galley_select");
         //if (!awakeTimeFile.exists()) return 0;
         FileWriter fr;
   FileWriter wr;
         try {
              fr = new FileWriter(awakeTimeFile);
     wr = new FileWriter(awakeTimeFile5621);
              fr.write("1");
     wr.write("1");
     if (true) log("/*************************wangyulu updateScreen write success ***************************/ ");
              fr.close();
     wr.close();
         } catch (IOException e) {
            e.printStackTrace();
          }
        // Don't update anything if we're not in the foreground (there's
        // no point updating our UI widgets since we're not visible!)
        // Also note this check also ensures we won't update while we're
        // in the middle of pausing, which could cause a visible glitch in
        // the "activity ending" transition.
        if (!mIsForegroundActivity) {
            if (DBG) log("- updateScreen: not the foreground Activity! Bailing out...");
            return;
        }

d:当3G挂断的时候就关闭3G的通道是

     if (!mIsForegroundActivity) {
            if (DBG) log("onPhoneStateChanged: Activity not in foreground! Bailing out...");
            /*************wangyulu add down************/
      File awakeTimeFile = new File("proc/sound8976/sound8976_galley_select");
      File awakeTimeFile5621 = new File("proc/sound5621/sound5621_galley_select");
            //if (!awakeTimeFile.exists()) return 0;
            FileWriter fr;
   FileWriter wr;
            try {
    
              fr = new FileWriter(awakeTimeFile);
     wr = new FileWriter(awakeTimeFile5621);
              fr.write("0");
     wr.write("0");
     if (true) log("/*************************wangyulu updateScreen write success ***************************/ ");
              fr.close();
     wr.close();
            } catch (IOException e) {
             e.printStackTrace();
            }
            return;
        }

在来看看我对wm8976的通道打开的函数吧

static int wm8976_set_register_sound( int val)
{  
 int i;
 unsigned int reg;
#if 1
 if ((val ==1) && (wm8976_flag == 1)){
  for (i=0; i<58; i++) { 
   reg = wm8976_read_reg_cache(g_codec, i);
   reg_buf[i] = reg;
   //printk("reg_buf=0x%02X\n", reg_buf[i]);
  }
  printk("************************wangyulu  888888888888888888888888888888************************\n");
 }
#endif
 //************ urbetter ***************
 sound8976_galley_select_flag = 0; 
 if(val == 0){
  //R0
      reg = wm8976_read_reg_cache(g_codec,WM8976_RESET);
          wm8976_write(g_codec, WM8976_RESET,  (reg |0x0000) & 0x0000);
      //R1
      reg = wm8976_read_reg_cache(g_codec, WM8976_POWER1);
          wm8976_write(g_codec, WM8976_POWER1, (reg | 0x001D) & 0x0000);
       //R2
       reg = wm8976_read_reg_cache(g_codec, WM8976_POWER2);
       wm8976_write(g_codec, WM8976_POWER2, (reg | 0x0015) & 0x0000);
       //R3
       reg = wm8976_read_reg_cache(g_codec, WM8976_POWER3);
           wm8976_write(g_codec, WM8976_POWER3, (reg | 0x006E) & 0x0000);
           printk("************************wangyulu   val=00000000000000000000000000************************\n");
    for(i=4 ; i<58; i++) {
    wm8976_write(g_codec, i, reg_buf[i]);
    //printk("reg_buf=0x%02X\n", reg_buf[i]); 0
    wm8976_flag =3;
    }
 }
      else if(val == 1) {
  printk("**********************wangyulu wm8976_set_register_sound ====1***********************\n"); 
      printk("wangyulu2 wm8976 LIN_LIP\n");
  wm8976_flag = 2;
  #if 1
  //R0
  reg = wm8976_read_reg_cache(g_codec,WM8976_RESET );
      wm8976_write(g_codec, WM8976_RESET,  (reg |0x0000) & 0x0000);
  //R1
  reg = wm8976_read_reg_cache(g_codec, WM8976_POWER1);
      //wm8976_write(g_codec, WM8976_POWER1, (reg | 0x001D) & 0x001D);//yuanlai
      wm8976_write(g_codec, WM8976_POWER1, (reg | 0x01D9) & 0x01D9);//LU
  //R2
  reg = wm8976_read_reg_cache(g_codec, WM8976_POWER2);
  wm8976_write(g_codec, WM8976_POWER2, (reg | 0x0195) & 0x0195);//yuanlai
  //R3
  reg = wm8976_read_reg_cache(g_codec, WM8976_POWER3);
      //wm8976_write(g_codec, WM8976_POWER3, (reg | 0x006E) & 0x006E);//yuanlai
      wm8976_write(g_codec, WM8976_POWER3, (reg | 0x01ef) & 0x01ef);  //LU
  //R4
  reg = wm8976_read_reg_cache(g_codec,WM8976_IFACE );
      wm8976_write(g_codec, WM8976_IFACE, (reg | 0x0010) & 0x0010);
  //R5
  reg = wm8976_read_reg_cache(g_codec,WM8976_COMP );
      wm8976_write(g_codec, WM8976_COMP,  (reg |  0x0000) & 0x0000);
  //R6
  reg = wm8976_read_reg_cache(g_codec,WM8976_CLOCK );
      wm8976_write(g_codec, WM8976_CLOCK, reg |  0x0000);
  //R7
  reg = wm8976_read_reg_cache(g_codec,WM8976_ADD);
      wm8976_write(g_codec, WM8976_ADD,  reg | 0x0000);
  //R8
  reg = wm8976_read_reg_cache(g_codec,WM8976_GPIO );
      wm8976_write(g_codec, WM8976_GPIO,  reg | 0x0000);
  //R9
  reg = wm8976_read_reg_cache(g_codec,WM8976_JACK1);
      wm8976_write(g_codec, WM8976_JACK1,  reg | 0x0000 );
  //R10
  reg = wm8976_read_reg_cache(g_codec,WM8976_DAC);
      wm8976_write(g_codec, WM8976_DAC,  reg | 0x0000); 
  //R11
  reg = wm8976_read_reg_cache(g_codec,WM8976_DACVOLL);
      wm8976_write(g_codec, WM8976_DACVOLL,  reg |0x01ff );
  //R12
  reg = wm8976_read_reg_cache(g_codec,WM8976_DACVOLR );
      wm8976_write(g_codec, WM8976_DACVOLR,  reg | 0x01ff);
  //R13
  reg = wm8976_read_reg_cache(g_codec,WM8976_JACK2);
      wm8976_write(g_codec, WM8976_JACK2,  reg |0x0000);
  //R14
  reg = wm8976_read_reg_cache(g_codec,WM8976_ADC);
      wm8976_write(g_codec, WM8976_ADC,  reg | 0x0100);
  //R15
  reg = wm8976_read_reg_cache(g_codec,WM8976_ADCVOL);
      wm8976_write(g_codec, WM8976_ADCVOL,  reg | 0x01ff);
  /*
  //R16
  reg = wm8976_read_reg_cache(g_codec,WM8976_EQ1);
      wm8976_write(g_codec, WM8976_EQ1,  reg | );
  //R17
  reg = wm8976_read_reg_cache(g_codec,WM8976_EQ2);
      wm8976_write(g_codec, WM8976_EQ2,  reg | );
      */
  //R18
  reg = wm8976_read_reg_cache(g_codec,WM8976_EQ1);
      wm8976_write(g_codec, WM8976_EQ1,  reg | 0x012c);
  //R19
  reg = wm8976_read_reg_cache(g_codec,WM8976_EQ2);
      wm8976_write(g_codec, WM8976_EQ2,  reg | 0x002c);
  //R20
  reg = wm8976_read_reg_cache(g_codec,WM8976_EQ3);
      wm8976_write(g_codec, WM8976_EQ3,  reg | 0x002c);
  //R21
  reg = wm8976_read_reg_cache(g_codec,WM8976_EQ4);
      wm8976_write(g_codec, WM8976_EQ4,  reg | 0x002c);
  //R22
  reg = wm8976_read_reg_cache(g_codec,WM8976_EQ5);
      wm8976_write(g_codec, WM8976_EQ5,  reg | 0x002c);
  /*
  //R23
  reg = wm8976_read_reg_cache(g_codec,WM8976_DACLIM2);
      wm8976_write(g_codec, WM8976_DACLIM2,  reg | );
         */
  //R24
  reg = wm8976_read_reg_cache(g_codec,WM8976_DACLIM1);
      wm8976_write(g_codec, WM8976_DACLIM1,  reg | 0x0032);
  //R25
  reg = wm8976_read_reg_cache(g_codec,WM8976_DACLIM2);
      wm8976_write(g_codec, WM8976_DACLIM2,  reg | 0x0000);
  /*
   //R26
  reg = wm8976_read_reg_cache(g_codec,WM8976_NOTCH3);
          wm8976_write(g_codec, WM8976_NOTCH3,  reg | );
          */
  //R27
  reg = wm8976_read_reg_cache(g_codec,WM8976_NOTCH1);
      wm8976_write(g_codec, WM8976_NOTCH1,  reg | 0x0000);
  //R28
  reg = wm8976_read_reg_cache(g_codec,WM8976_NOTCH2);
      wm8976_write(g_codec, WM8976_NOTCH2,  reg | 0x0000);
  //R29
  reg = wm8976_read_reg_cache(g_codec,WM8976_NOTCH3);
      wm8976_write(g_codec, WM8976_NOTCH3,  reg | 0x0000);
  //R30
  reg = wm8976_read_reg_cache(g_codec,WM8976_NOTCH4);
      wm8976_write(g_codec, WM8976_NOTCH4,  reg | 0x0000);
  /*
  //R31
  reg = wm8976_read_reg_cache(g_codec,WM8976_NGATE);
      wm8976_write(g_codec, WM8976_NGATE,  reg | );
      */
  //R32
  reg = wm8976_read_reg_cache(g_codec, WM8976_ALC1);
  wm8976_write(g_codec, WM8976_ALC1, (reg | 0x0038) & 0x0038);
  //R33
  reg = wm8976_read_reg_cache(g_codec,WM8976_ALC2);
      wm8976_write(g_codec, WM8976_ALC2,  reg | 0x000b );
  //R34
  reg = wm8976_read_reg_cache(g_codec,WM8976_ALC3);
      wm8976_write(g_codec, WM8976_ALC3,  reg | 0x0032);
  //R35
  reg = wm8976_read_reg_cache(g_codec,WM8976_NGATE);
      wm8976_write(g_codec, WM8976_NGATE,  reg | 0x0000);
  //R36
  reg = wm8976_read_reg_cache(g_codec,WM8976_PLLN);
      wm8976_write(g_codec, WM8976_PLLN,  reg | 0x0008);
  //R37
  reg = wm8976_read_reg_cache(g_codec,WM8976_PLLK1);
      wm8976_write(g_codec, WM8976_PLLK1,  reg | 0x000c);
  //R38
  reg = wm8976_read_reg_cache(g_codec,WM8976_PLLK2);
      wm8976_write(g_codec, WM8976_PLLK2,  reg | 0x0093);
  //R39
  reg = wm8976_read_reg_cache(g_codec,WM8976_PLLK3);
      wm8976_write(g_codec, WM8976_PLLK3,  reg | 0x00e9);
  /*
  //R40
  reg = wm8976_read_reg_cache(g_codec,WM8976_DAC);
      wm8976_write(g_codec, WM8976_DAC,  reg | );
      */
  //R41
  reg = wm8976_read_reg_cache(g_codec,WM8976_3D);
      wm8976_write(g_codec, WM8976_3D,  reg | 0x0000 );
  /*
  //R42
  reg = wm8976_read_reg_cache(g_codec,WM8976_DAC);
      wm8976_write(g_codec, WM8976_DAC,  reg | );
  */
  //R43
  reg = wm8976_read_reg_cache(g_codec,WM8976_BEEP);
      wm8976_write(g_codec, WM8976_BEEP,  reg | 0x0010);
      //R44
  reg = wm8976_read_reg_cache(g_codec, WM8976_INPUT);
  wm8976_write(g_codec, WM8976_INPUT, reg | 0x0003);
  //R45
  //reg = wm8976_read_reg_cache(g_codec, WM8976_INPPGA);
  //wm8976_write(g_codec, WM8976_INPPGA, (reg | 0x01B8) & 0x01B8);//yuan
  //wm8976_write(g_codec, WM8976_INPPGA, (reg | 0x01f8) & 0x01f8);
  //lu
  //R45  lu  out4
  reg = wm8976_read_reg_cache(g_codec, WM8976_INPPGA);
  //wm8976_write(g_codec, WM8976_INPPGA, (reg | 0x007f) & 0x0000);
  wm8976_write(g_codec, WM8976_INPPGA, (reg | 0x007f) & 0xFF3F);
  /*
  //R46
  reg = wm8976_read_reg_cache(g_codec,WM8976_DAC);
      wm8976_write(g_codec, WM8976_DAC,  reg | );
  */
  //R47
  reg = wm8976_read_reg_cache(g_codec, WM8976_ADCBOOST);
      wm8976_write(g_codec, WM8976_ADCBOOST, (reg | 0x0100) & 0x0100);
  /*
      //R48
      reg = wm8976_read_reg_cache(g_codec,WM8976_DAC);
      wm8976_write(g_codec, WM8976_DAC,  reg | );
      */
      //R49
      reg = wm8976_read_reg_cache(g_codec, WM8976_OUTPUT);
      wm8976_write(g_codec, WM8976_OUTPUT, (reg | 0x0018) & 0x0018);//yuan
  //R50 //yuanlai
      //reg = wm8976_read_reg_cache(g_codec, WM8976_MIXL);
      //wm8976_write(g_codec, WM8976_MIXL, (reg | 0x01E0) & 0x01E0);
      //R50 //lu youyong out3
      reg = wm8976_read_reg_cache(g_codec, WM8976_MIXL);
      //wm8976_write(g_codec, WM8976_MIXL, (reg | 0xffff) & 0xffff);
      wm8976_write(g_codec, WM8976_MIXL, (reg | 0xfffd) & 0xfffd);
  //R51
      reg = wm8976_read_reg_cache(g_codec, WM8976_MIXR);
      wm8976_write(g_codec, WM8976_MIXR, (reg | 0x01e0) & 0x01e0);
      //R52
  reg = wm8976_read_reg_cache(g_codec, WM8976_HPVOLL);
  wm8976_write(g_codec, WM8976_HPVOLL, (reg | 0x0135) & 0x0135);
  //R53
  reg = wm8976_read_reg_cache(g_codec, WM8976_HPVOLR);
      wm8976_write(g_codec, WM8976_HPVOLR, (reg | 0x0135) & 0x0135);
  //R54
  reg = wm8976_read_reg_cache(g_codec,WM8976_SPKVOLL);
      wm8976_write(g_codec, WM8976_SPKVOLL,  reg | 0x013a);
  //R55
  reg = wm8976_read_reg_cache(g_codec,WM8976_SPKVOLR);
      wm8976_write(g_codec, WM8976_SPKVOLR,  reg | 0x013a);
  //R56
  reg = wm8976_read_reg_cache(g_codec, WM8976_OUT3MIX);
  //wm8976_write(g_codec, WM8976_OUT3MIX, (reg | 0x000f) & 0x000f);
  wm8976_write(g_codec, WM8976_OUT3MIX, (reg | 0x0004) & 0x0004);
      //R57
      reg = wm8976_read_reg_cache(g_codec, WM8976_MONOMIX);
      wm8976_write(g_codec, WM8976_MONOMIX, (reg | 0x0019) & 0x0019);  
     
#endif
#if 0//out3 shihaode
    
//lulu  wm8976_write(g_codec, WM8976_POWER1, pwr_reg|0x01D);//off
    printk("************************wangyulu sound8976_galley_select_flag ====1***********************\n");
        //R0
    reg = wm8976_read_reg_cache(g_codec,WM8976_RESET );
        wm8976_write(g_codec, WM8976_RESET,  (reg |0x0000) & 0x0000);
    //R1
    reg = wm8976_read_reg_cache(g_codec, WM8976_POWER1);
        //wm8976_write(g_codec, WM8976_POWER1, (reg | 0x001D) & 0x001D);//yuanlai
        wm8976_write(g_codec, WM8976_POWER1, (reg | 0x01D9) & 0x01D9);//LU
    //R2
    reg = wm8976_read_reg_cache(g_codec, WM8976_POWER2);
    wm8976_write(g_codec, WM8976_POWER2, (reg | 0x0195) & 0x0195);//yuanlai
    //R3
    reg = wm8976_read_reg_cache(g_codec, WM8976_POWER3);
        //wm8976_write(g_codec, WM8976_POWER3, (reg | 0x006E) & 0x006E);//yuanlai
        wm8976_write(g_codec, WM8976_POWER3, (reg | 0x01ef) & 0x01ef);  //LU
        //R32
    reg = wm8976_read_reg_cache(g_codec, WM8976_ALC1);
    wm8976_write(g_codec, WM8976_ALC1, (reg | 0x0000) & 0xfeff);
    //R44
    reg = wm8976_read_reg_cache(g_codec, WM8976_INPUT);
    wm8976_write(g_codec, WM8976_INPUT, (reg | 0x0003) & 0xffff);
   
    //R45 out3
    reg = wm8976_read_reg_cache(g_codec, WM8976_INPPGA);
    wm8976_write(g_codec, WM8976_INPPGA, (reg | 0x007f) & 0xFF3F);
    //R47
    reg = wm8976_read_reg_cache(g_codec, WM8976_ADCBOOST);
        wm8976_write(g_codec, WM8976_ADCBOOST, (reg | 0x0170) & 0xFFF0);  
    //R47
    reg = wm8976_read_reg_cache(g_codec, WM8976_ADCBOOST);
        wm8976_write(g_codec, WM8976_ADCBOOST, (reg | 0x01F0) & 0xFFF0);
    //R49
        reg = wm8976_read_reg_cache(g_codec, WM8976_OUTPUT);
        wm8976_write(g_codec, WM8976_OUTPUT, (reg | 0x001b) & 0xFEFF);
    printk("wangyulu2 wm8976 MIX_out4 lululu\n");
        //R50
        reg = wm8976_read_reg_cache(g_codec, WM8976_MIXL);
        wm8976_write(g_codec, WM8976_MIXL, reg | 0x01FE);
    //R50
        reg = wm8976_read_reg_cache(g_codec, WM8976_MIXL);
        //wm8976_write(codec, WM8976_MIXL, (reg | 0x01FE) & 0xfffd);
        wm8976_write(g_codec, WM8976_MIXL, (reg | 0xffff) & 0xffff);
        //R51
        reg = wm8976_read_reg_cache(g_codec, WM8976_MIXR);
        //wm8976_write(codec, WM8976_MIXR, reg | 0x0020);
        wm8976_write(g_codec, WM8976_MIXR, reg | 0x01e0);
        //R52
    reg = wm8976_read_reg_cache(g_codec, WM8976_HPVOLL);
    wm8976_write(g_codec, WM8976_HPVOLL, (reg | 0x003F) & 0xFFBF);
    //R53
    reg = wm8976_read_reg_cache(g_codec, WM8976_HPVOLR);
        wm8976_write(g_codec, WM8976_HPVOLR, (reg | 0x003F)& 0xFFBF); 

        printk("wangyulu2 wm8976 MIX_out3\n");
    //R56
    reg = wm8976_read_reg_cache(g_codec, WM8976_OUT3MIX);
    wm8976_write(g_codec, WM8976_OUT3MIX, (reg | 0x0006) & 0xffbf); //6=0
        //R57
        reg = wm8976_read_reg_cache(g_codec, WM8976_MONOMIX);
        wm8976_write(g_codec, WM8976_MONOMIX, (reg | 0x0000) & 0xff00);
#endif
  //************ urbetter *************** 
    }
    sound8976_galley_select_flag = val;

}

上面是我打开wm8976的3G的通道，同时又不影响wm8976的其他的工作方式。

以上是我调试wm8976用于3G的主要思路，现在已经完成，下面有时间写写wm8976的通道打开注意的问题，同时我也做了RT5621的音频驱动，还有就是把wm8976移植到2.3系统上的问题和rt621移植到2.3上的问题，陆续会和大家分享我的心得。不足之处请大家指教。