static irqreturn_t stylus_action(int irq, void *dev_id) { unsigned long data0; unsigned long data1; if (OwnADC) { data0 = ioread32(base_addr+S3C2410_ADCDAT0); data1 = ioread32(base_addr+S3C2410_ADCDAT1); xp += data0 & S3C2410_ADCDAT0_XPDATA_MASK; yp += data1 & S3C2410_ADCDAT1_YPDATA_MASK; count++; if (count < (1<<2)) { //如果小于4，继续启动adc iowrite32(S3C2410_ADCTSC_PULL_UP_DISABLE | AUTOPST, base_addr+S3C2410_ADCTSC); iowrite32(ioread32(base_addr+S3C2410_ADCCON) | S3C2410_ADCCON_ENABLE_START, base_addr+S3C2410_ADCCON); } else { //已经采样了4次，等待1ms后调用touch_timer函数。 mod_timer(&touch_timer, jiffies+1); iowrite32(WAIT4INT(1), base_addr+S3C2410_ADCTSC); } } return IRQ_HANDLED; }
接下来就得看一下touch_timer在忙些什么请看招。。。。。。。。。。。