void irq_adc(void)
{
if ((ADCDAT0 & (1<<15)) == 0) /* 触摸笔仍然处于按下状态 */
{
/* 如果是x坐标, 记录下来, 启动Y坐标的ADC */
if ((ADCTSC & 0x3) == 1)
{
x = ADCDAT0 & 0xfff;
/* 清中断 */
ADCCLRINT = 0;
enter_to_measure_y();
start_adc();
}
else if ((ADCTSC & 0x3) == 2)
{
/* 如果是Y坐标, 记录下来, wait_for_pen_up */
y = ADCDAT1 & 0xfff;
/* 清中断 */
ADCCLRINT = 0;
wait_for_pen_up();
has_get_xy = 1;
//printf("[x,y] = [%d, %d]\n\r", x, y);
}
}
else
{
/* 在ADC期间, 触摸笔已经松开了 */
wait_for_pen_down();
}
}
static irqreturn_t pen_down_up_isr(int irq, void *dev_ids)
{
unsigned long data0, data1;
int down;
data0 = ts_regs->adcdat0;
data1 = ts_regs->adcdat1;
down = (!(data0 & (1<<15))) && (!(data1 & (1<<15)));
if (!down)
{
printk("pen_down_up_isr: up\n");
wait_for_pen_down();
}
else
{
printk("pen_down_up_isr: down\n");
//wait_for_pen_up();
enter_to_measure_xy();
//enter_to_measure_x();
start_adc();
}
/* clear interrupt */
//ts_regs->adcupdn = 0 ;
ts_regs->adcclrintpndnup = 0;
ts_regs->adcclrint = 0 ;
return IRQ_HANDLED;
}
void ts_init(void)
{
/* 一般的设置:比如时钟 */
ADCCON &= ~((0xff << 6) | (1<<2));
/* 12-bit A/D conversion, bit16
* A/D converter prescaler enable, bit14
* A/D converter prescaler value = 13, ADC CLK = 66.5MHz/(255+1)=4.75MHz, bit[13:6]
*/
ADCCON |= (1<<16) | (1<<14) | (255<<6);
ADCDLY = 0xffff;
/* 中断设置 */
ts_irq_init();
wait_for_pen_down();
}
void irq_pen_down_up(void)
{
if (ADCDAT0 & (1<<15))
{
//printf("pen up\n\r");
//ADCTSC &= ~(1<<8); /* Detect Stylus Down Interrupt Signal. */
wait_for_pen_down();
}
else
{
//printf("pen down\n\r");
//wait_for_pen_up();
enter_to_measure_x();
start_adc();
}
ADCUPDN = 0;
ADCCLRINTPNDNUP = 0;
}
static void ts_timer_function(unsigned long data)
{
unsigned long data0, data1;
int down;
data0 = ts_regs->adcdat0;
data1 = ts_regs->adcdat1;
down = (!(data0 & (1<<15))) && (!(data1 & (1<<15)));
if (down)
{
if (cnt == 4)
{
// report
input_report_abs(ts_dev, ABS_X, x);
input_report_abs(ts_dev, ABS_Y, y);
input_report_key(ts_dev, BTN_TOUCH, 1);
input_report_abs(ts_dev, ABS_PRESSURE, 1);
input_sync(ts_dev);
x = y = cnt = 0;
mod_timer(&ts_timer, jiffies + HZ * 10 / 1000);
}
else
{
enter_to_measure_xy();
start_adc();
}
}
else
{
input_report_key(ts_dev, BTN_TOUCH, 0);
input_report_abs(ts_dev, ABS_PRESSURE, 0);
input_sync(ts_dev);
x = y = cnt = 0;
wait_for_pen_down();
}
}
void s3c_ts_hardware_setup(void)
{
struct clk *ts_clk = clk_get(NULL, "adc");
clk_enable(ts_clk);
/* clock */
ts_regs->adccon &= ~((0xff << 6) | (1<<2));
/* 12-bit A/D conversion, bit16
* A/D converter prescaler enable, bit14
* A/D converter prescaler value = 13, ADC CLK = 66.5MHz/(255+1)=4.75MHz, bit[13:6]
*/
ts_regs->adccon |= (1<<16) | (1<<14) | (255<<6);
ts_regs->adcdly = 0xffff;
request_irq(IRQ_TC, pen_down_up_isr, 0, "ts_tc", 1);
request_irq(IRQ_ADC, adc_isr, 0, "ts_adc", 1);
wait_for_pen_down();
}
