static void adc_step_config(struct adc_device *adc_dev, bool mode)
{
unsigned int stepconfig;
int i, channels = 0, steps;
/*
* There are 16 configurable steps and 8 analog input
* lines available which are shared between Touchscreen and ADC.
*
* Steps backwards i.e. from 16 towards 0 are used by ADC
* depending on number of input lines needed.
* Channel would represent which analog input
* needs to be given to ADC to digitalize data.
*/
steps = TOTAL_STEPS - adc_dev->channels;
channels = TOTAL_CHANNELS - adc_dev->channels;
if (mode == 0)
stepconfig = TSCADC_STEPCONFIG_AVG_16 | TSCADC_STEPCONFIG_FIFO1;
else
stepconfig = TSCADC_STEPCONFIG_AVG_16 | TSCADC_STEPCONFIG_FIFO1
| TSCADC_STEPCONFIG_MODE_SWCNT;
for (i = (steps + 1); i <= TOTAL_STEPS; i++) {
adc_writel(adc_dev, TSCADC_REG_STEPCONFIG(i),
stepconfig | TSCADC_STEPCONFIG_INP(channels));
adc_writel(adc_dev, TSCADC_REG_STEPDELAY(i),
TSCADC_STEPCONFIG_OPENDLY);
channels++;
}
}
static ssize_t tiadc_set_mode(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct adc_device *adc_dev = iio_priv(indio_dev);
unsigned int config;
config = adc_readl(adc_dev, TSCADC_REG_CTRL);
config &= ~(TSCADC_CNTRLREG_TSCSSENB);
adc_writel(adc_dev, TSCADC_REG_CTRL, config);
if (!strncmp(buf, "oneshot", 7))
adc_dev->is_continuous_mode = false;
else if (!strncmp(buf, "continuous", 10))
adc_dev->is_continuous_mode = true;
else {
dev_err(dev, "Operational mode unknown\n");
return -EINVAL;
}
adc_step_config(adc_dev, adc_dev->is_continuous_mode);
config = adc_readl(adc_dev, TSCADC_REG_CTRL);
adc_writel(adc_dev, TSCADC_REG_CTRL,
(config | TSCADC_CNTRLREG_TSCSSENB));
return count;
}
static void rk30_adc_start(struct adc_host *adc)
{
struct rk30_adc_device *dev = adc_priv(adc);
int chn = adc->chn;
//adc_writel(0, dev->regs + ADC_CTRL);
adc_writel(0x08, dev->regs + ADC_DELAY_PU_SOC);
adc_writel(ADC_CTRL_POWER_UP|ADC_CTRL_CH(chn)|ADC_CTRL_IRQ_ENABLE, dev->regs + ADC_CTRL);
return;
}
static void rk30_adc_stop(struct adc_host *adc)
{
struct rk30_adc_device *dev = adc_priv(adc);
adc_writel(0, dev->regs + ADC_CTRL);
}
