Added write_raw function to manipulate the optional divider_by_two
through the scaling attribute out of the available scales.
Signed-off-by: Hector Palacios <hector.palacios@xxxxxxxx>
---
drivers/staging/iio/adc/mxs-lradc.c | 55 ++++++++++++++++++++++++++++++++++++-
1 file changed, 54 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/iio/adc/mxs-lradc.c b/drivers/staging/iio/adc/mxs-lradc.c
index c929733..286cde2 100644
--- a/drivers/staging/iio/adc/mxs-lradc.c
+++ b/drivers/staging/iio/adc/mxs-lradc.c
@@ -144,6 +144,7 @@ struct mxs_lradc {
uint32_t vref_mv[LRADC_MAX_TOTAL_CHANS];
unsigned int scale_avail[LRADC_MAX_TOTAL_CHANS][2][2];
+ unsigned int is_divided[LRADC_MAX_TOTAL_CHANS];
/*
* Touchscreen LRADC channels receives a private slot in the CTRL4
@@ -202,6 +203,7 @@ struct mxs_lradc {
#define LRADC_CTRL1_LRADC_IRQ_OFFSET 0
#define LRADC_CTRL2 0x20
+#define LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET 24
#define LRADC_CTRL2_TEMPSENSE_PWD (1 << 15)
#define LRADC_STATUS 0x40
@@ -310,7 +312,8 @@ static int mxs_lradc_read_raw(struct iio_dev *iio_dev,
break;
case IIO_CHAN_INFO_SCALE:
*val = lradc->vref_mv[chan->channel];
- *val2 = chan->scan_type.realbits;
+ *val2 = chan->scan_type.realbits -
+ lradc->is_divided[chan->channel];
ret = IIO_VAL_FRACTIONAL_LOG2;
break;
default:
@@ -323,6 +326,54 @@ static int mxs_lradc_read_raw(struct iio_dev *iio_dev,
return ret;
}
+static int mxs_lradc_write_raw(struct iio_dev *iio_dev,
+ const struct iio_chan_spec *chan,
+ int val, int val2, long m)
+{
+ struct mxs_lradc *lradc = iio_priv(iio_dev);
+ int ret;
+
+ ret = mutex_trylock(&lradc->lock);
+ if (!ret)
+ return -EBUSY;
+
+ switch (m) {
+ case IIO_CHAN_INFO_SCALE:
+ ret = -EINVAL;
+ if (val == lradc->scale_avail[chan->channel][0][0] &&
+ val2 == lradc->scale_avail[chan->channel][0][1]) {
+ /* [0] -> divider by two disabled */
+ writel(1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
+ lradc->base + LRADC_CTRL2 + STMP_OFFSET_REG_CLR);
+ lradc->is_divided[chan->channel] = 0;
+ ret = 0;
+ } else if (val == lradc->scale_avail[chan->channel][1][0] &&
+ val2 == lradc->scale_avail[chan->channel][1][1]) {
+ /* [1] -> divider by two enabled */
+ writel(1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
+ lradc->base + LRADC_CTRL2 + STMP_OFFSET_REG_SET);
+ lradc->is_divided[chan->channel] = 1;
+ ret = 0;
+ }
+
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ mutex_unlock(&lradc->lock);
+
+ return ret;
+}
+
+static int mxs_lradc_write_raw_get_fmt(struct iio_dev *iio_dev,
+ const struct iio_chan_spec *chan,
+ long m)
+{
+ return IIO_VAL_INT_PLUS_NANO;
+}
+
static ssize_t mxs_lradc_show_scale_available_ch(struct device *dev,
struct device_attribute *attr,
char *buf,
@@ -400,6 +451,8 @@ static const struct attribute_group mxs_lradc_attribute_group = {
static const struct iio_info mxs_lradc_iio_info = {
.driver_module = THIS_MODULE,
.read_raw = mxs_lradc_read_raw,
+ .write_raw = mxs_lradc_write_raw,
+ .write_raw_get_fmt = &mxs_lradc_write_raw_get_fmt,
.attrs = &mxs_lradc_attribute_group,
};
--
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