/*!
\pre register_channel (uint8_t channel, uint8_t prescale,void (*conversion_function)(uint16_t));
\param channel choses the channel of the ADC which should be converted
\param mode choses between SingleShot and FreeRunning AD- Conversion
\return is the value of the ADMUX
*/
uint8_t start_conversion(uint8_t channel, uint8_t mode){
//used the adc.c methodes to configure the ADC
set_adc_mode(channel);
set_adc_prescaler(prescalearry[channel]);
//gets the asigned function pointer of the channel for the interrupt
functiontemp=pointerarray[channel];
set_adc_interruptenable();
//selects between the to possible modes
if(mode==FREE){ set_freerunning();}
else {
ADCSRA |= (1<<ADEN);
if( (ADCSRA & (1<<ADSC)) == 0){
ADCSRA |= (1<<ADSC);
}
}
return ADMUX;
}
/* 初始化函数 */
static int __init ts_init(void)
{
int err = -ENOMEM;
struct ts_data *ts;
/* 给 ts 数据分配空间 */
ts = kzalloc(sizeof(struct ts_data), GFP_KERNEL);
if (!ts) goto kzalloc_ts_fail;
/* 给输入设备分配空间 */
dev = input_allocate_device();
if (!dev) goto input_allocate_fail;
/* 获取并打开时钟源 */
ts->clk = clk_get(NULL, "adc");
if (!ts->clk) {
pr_err("clk_get(adc) ERR!\n");
err = -ENOENT;
goto clk_get_fail;
}
clk_enable(ts->clk);
/* 设置 GPIO 管脚的功能 */
s3c2410_gpio_cfgpin(S3C2410_GPG12, S3C2410_GPG12_XMON);
s3c2410_gpio_cfgpin(S3C2410_GPG13, S3C2410_GPG13_nXPON);
s3c2410_gpio_cfgpin(S3C2410_GPG14, S3C2410_GPG14_YMON);
s3c2410_gpio_cfgpin(S3C2410_GPG15, S3C2410_GPG15_nYPON);
/* 申请 IO 内存 */
if (!request_mem_region(S3C24XX_PA_ADC, S3C24XX_SZ_ADC, DEVNAME)) {
pr_err("ts_init: request_mem_region() ERR!\n");
err = -EBUSY;
goto request_mem_fail;
}
/* 映射 IO 内存 */
ts->iobase = ioremap(S3C24XX_PA_ADC, S3C24XX_SZ_ADC);
if (!ts->iobase) {
pr_err("ts_init: ioremap() ERR!\n");
goto ioremap_fail;
}
/* 初始化定时器 */
setup_timer(&ts->timer, ts_timer, (unsigned long)dev);
/* 初始化数据 */
clear_data(ts);
/* 初始化输入设备 */
dev->name = DEVNAME; /* 名称 */
/* 设置输入设备的私有数据 */
input_set_drvdata(dev, ts);
/* 设置输入设备的功能 */
input_set_capability(dev, EV_KEY, BTN_TOUCH);
input_set_capability(dev, EV_ABS, ABS_X);
input_set_capability(dev, EV_ABS, ABS_Y);
/* 设置绝对坐标事件参数 */
input_set_abs_params(dev, ABS_X, X_AXIS_MIN, X_AXIS_MAX, 0, 0);
input_set_abs_params(dev, ABS_Y, Y_AXIS_MIN, Y_AXIS_MAX, 0, 0);
/* 申请中断 */
if (request_irq(IRQ_ADC, adc_handler, IRQF_DISABLED, DEVNAME, dev)) {
pr_err("request_irq(IRQ_ADC) ERR!\n");
err = -EBUSY;
goto request_irq_adc_fail;
}
if (request_irq(IRQ_TC, tc_handler, IRQF_DISABLED, DEVNAME, dev)) {
pr_err("request_irq(IRQ_TC) ERR!\n");
err = -EBUSY;
goto request_irq_tc_fail;
}
/* 注册输入设备 */
if (input_register_device(dev)) {
pr_err("input_register_device ERR!\n");
goto input_register_fail;
}
/* 设置 ADC 时钟的预分频值，以下设置必须放在 IO 内存映射之后 */
set_adc_prescaler(ts, ADC_PRESCALER);
/* 设置转换延时 */
set_adc_delay(ts, ADC_DELAY);
/* 设置 ADC 为等待中断模式 */
set_adc_wait4int(ts);
/* 设置 ADC 为非备用模式 */
set_adc_standby(ts, 0);
/* 关闭 ADC 的读触发功能 */
set_adc_read_start(ts, 0);
return 0;
input_register_fail:
free_irq(IRQ_TC, dev);
request_irq_tc_fail:
free_irq(IRQ_ADC, dev);
request_irq_adc_fail:
iounmap(ts->iobase);
ioremap_fail:
release_mem_region(S3C24XX_PA_ADC, S3C24XX_SZ_ADC);
request_mem_fail:
clk_disable(ts->clk);
clk_put(ts->clk);
clk_get_fail:
input_free_device(dev);
input_allocate_fail:
kfree(ts);
kzalloc_ts_fail:
return err;
}
