iio: hi8435: add raw access

With current event-only driver, it is not possible for user space
application to know current senses if they don't change since
application starts.

Address that by adding raw access to channels.

Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/adc/hi8435.c b/drivers/iio/adc/hi8435.c
index 678e8c7ea7633afb0dacbdca89863fb009a8847c..cb8e6342eddfad96793db3c87adf5171c8e96bc0 100644 (file)
--- a/drivers/iio/adc/hi8435.c
+++ b/drivers/iio/adc/hi8435.c
@@ -105,6 +105,26 @@ static int hi8435_writew(struct hi8435_priv *priv, u8 reg, u16 val)
        return spi_write(priv->spi, priv->reg_buffer, 3);
 }
 
+static int hi8435_read_raw(struct iio_dev *idev,
+                          const struct iio_chan_spec *chan,
+                          int *val, int *val2, long mask)
+{
+       struct hi8435_priv *priv = iio_priv(idev);
+       u32 tmp;
+       int ret;
+
+       switch (mask) {
+       case IIO_CHAN_INFO_RAW:
+               ret = hi8435_readl(priv, HI8435_SO31_0_REG, &tmp);
+               if (ret < 0)
+                       return ret;
+               *val = !!(tmp & BIT(chan->channel));
+               return IIO_VAL_INT;
+       default:
+               return -EINVAL;
+       }
+}
+
 static int hi8435_read_event_config(struct iio_dev *idev,
                                    const struct iio_chan_spec *chan,
                                    enum iio_event_type type,
@@ -333,6 +353,7 @@ static const struct iio_chan_spec_ext_info hi8435_ext_info[] = {
        .type = IIO_VOLTAGE,                            \
        .indexed = 1,                                   \
        .channel = num,                                 \
+       .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),   \
        .event_spec = hi8435_events,                    \
        .num_event_specs = ARRAY_SIZE(hi8435_events),   \
        .ext_info = hi8435_ext_info,                    \
@@ -376,6 +397,7 @@ static const struct iio_chan_spec hi8435_channels[] = {
 
 static const struct iio_info hi8435_info = {
        .driver_module = THIS_MODULE,
+       .read_raw = hi8435_read_raw,
        .read_event_config = &hi8435_read_event_config,
        .write_event_config = hi8435_write_event_config,
        .read_event_value = &hi8435_read_event_value,