android按键长按短按功能的实现策略

定时器轮休的方式，根据采样次数来区分长按还是短按

1.当按下键1的时候，就不断的计数，直到你放手电压值变化，再根据计数的次数判断上报长按还是短按的功能

没有按键的时候采样率为HZ/4，采样是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  )  //根据电压值采取不同按键

286     {

287         // sw2

288             if (key_pressed == 1)  //计数为了减小误触以及实现短按长按的功能

289                 count++;

290             else {

291                 key_pressed = 1;

292                 count = 0;

293             }

294             

295             if (count > 5)   //计数到大于5时，有2种情况出现

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) {//大于0x34时，根据count的次数判断长按还是短按，并上报不同的功能

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  }