定時器輪休的方式，根據取樣次數來區分長按還是短按 1.當按下鍵1的時候，就不斷的計數，直到你放手電壓值變化，再根據計數的次數判斷上報長按還是短按的功能 沒有按鍵的時候取樣率為HZ/4，取樣是HZ/40 static void  lradc1_data_function(unsigned long data) 248 { 249         volatile unsigned int  reg_val; 250         static int key_pressed = -1, count = 0; 251     int delay = HZ/40; 252         reg_val = readl(KEY_BASSADDRESS+LRADC_DATA1); 253 //       printk("[lkj]  second lradc data1 =0x%x, s_headset_plug=%d \n", reg_val, s_headset_plug); 254         //because recorder app close this, so ....

255         writel( readl(baseaddr+0x28) | (1<<27),(baseaddr+(0x28))); 256         writel( readl(baseaddr+0x28) | (1<<29),(baseaddr+(0x28))); 257 258         if(s_first_headset_plug != 1 || s_mic_type != 1) { 259                 mod_timer(&mic_data->timer, jiffies +  HZ/4); 260                 printk("[lkj] input key hook key return \n");

261                 return ; 262         } 263     if (reg_val >=0 && reg_val < 0x5 ) 264     { 265             // hook key 266             if (key_pressed == 0) 267                 count++; 268             else { 269                 key_pressed = 0; 270                 count = 0; 271             } 272              273             if (count > 5) 274             { 275                              sw_pressed[0] = 1; 276                  input_report_key(sun4ikbd_dev, HOOK_KEY, 1); 277                  input_sync(sun4ikbd_dev); 278                  printk("[lkj] input key sw1 down \n"); 279                  count = 0; 280             } 281 282      283      284     } 285     else if( reg_val >= 0x6 && reg_val <= 0xb  )  //根據電壓值採取不同按鍵 286     { 287         // sw2 288             if (key_pressed == 1)  //計數為了減小誤觸以及實現短按長按的功能 289                 count++; 290             else { 291                 key_pressed = 1; 292                 count = 0; 293             } 294              295             if (count > 5)   //計數到大於5時，有2種情況出現 296             { 297                              sw_pressed[1] = 1; 298              //    printk("[lkj] input key sw2 down \n"); 299             } 300 301     } 302     else if ( reg_val >= 0xf && reg_val < 0x1f ) 303     { 304         // sw3 305              if (key_pressed == 2) 306                 count++; 307             else { 308                 key_pressed = 2; 309                 count = 0; 310             } 311              312             if (count > 5) 313             { 314                              sw_pressed[2] = 1; 315            //      printk("[lkj] input key sw3 down \n"); 316             } 317 318    } 319     else if ( reg_val >= 0x34) {//大於0x34時，根據count的次數判斷長按還是短按，並上報不同的功能 320         key_pressed = -1; 321                 if (sw_pressed[0]) 322                 { 323                         sw_pressed[0] = 0; 324                         input_report_key(sun4ikbd_dev, HOOK_KEY, 0); 325                         input_sync(sun4ikbd_dev); 326             //            printk("[lkj] input key sw1 up \n"); 327                 } 328                 if (sw_pressed[1]) 329                 { 330                         sw_pressed[1] = 0; 331             if (count > 20){ 332                          input_report_key(sun4ikbd_dev,KEY_NEXTSONG,1); 333                          input_sync(sun4ikbd_dev); 334                          input_report_key(sun4ikbd_dev, KEY_NEXTSONG, 0); 335                          input_sync(sun4ikbd_dev); 336              337             }//long 338              else{ 339               340                         input_report_key(sun4ikbd_dev, KEY_VOLUMEUP, 1); 341                         input_sync(sun4ikbd_dev); 342                         input_report_key(sun4ikbd_dev, KEY_VOLUMEUP, 0); 343                         input_sync(sun4ikbd_dev); 344               345              }//     shot 346 347                 } 348                 if (sw_pressed[2]) 349                 { 350                         sw_pressed[2] = 0; 351             if (count > 20){ 352                          input_report_key(sun4ikbd_dev,KEY_PREVIOUSSONG,1); 353                          input_sync(sun4ikbd_dev); 354                          input_report_key(sun4ikbd_dev, KEY_PREVIOUSSONG, 0); 355                          input_sync(sun4ikbd_dev); 356              357             }//long 358              else{ 359               360                         input_report_key(sun4ikbd_dev, KEY_VOLUMEDOWN, 1); 361                         input_sync(sun4ikbd_dev); 362                         input_report_key(sun4ikbd_dev, KEY_VOLUMEDOWN, 0); 363                         input_sync(sun4ikbd_dev); 364               365              }//     shot 366                 } 367         count = 0; 368         delay = HZ/4; 369  }