staging:iio:accel:sca3000 Drop custom ABI for watersheds.

For now we support only the 50% watershed interrupt and start and stop it
as part of the buffer bring up.  The 75% case may come back in future.

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>

diff --git a/drivers/staging/iio/accel/sca3000.c b/drivers/staging/iio/accel/sca3000.c
index 8af7d83e658d81e5c887434eb9b44e9e4dbb9a72..173e9a69d44f25b5f19619533a405a8ea445d7fc 100644 (file)
--- a/drivers/staging/iio/accel/sca3000.c
+++ b/drivers/staging/iio/accel/sca3000.c
@@ -1309,73 +1309,6 @@ static size_t sca3000_ring_buf_data_available(struct iio_buffer *r)
        return r->stufftoread ? r->watermark : 0;
 }
 
-/**
- * sca3000_query_ring_int() is the hardware ring status interrupt enabled
- **/
-static ssize_t sca3000_query_ring_int(struct device *dev,
-                                     struct device_attribute *attr,
-                                     char *buf)
-{
-       struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
-       int ret, val;
-       struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-       struct sca3000_state *st = iio_priv(indio_dev);
-
-       mutex_lock(&st->lock);
-       ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_MASK, 1);
-       val = st->rx[0];
-       mutex_unlock(&st->lock);
-       if (ret)
-               return ret;
-
-       return sprintf(buf, "%d\n", !!(val & this_attr->address));
-}
-
-/**
- * sca3000_set_ring_int() set state of ring status interrupt
- **/
-static ssize_t sca3000_set_ring_int(struct device *dev,
-                                   struct device_attribute *attr,
-                                   const char *buf,
-                                   size_t len)
-{
-       struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-       struct sca3000_state *st = iio_priv(indio_dev);
-       struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
-       u8 val;
-       int ret;
-
-       mutex_lock(&st->lock);
-       ret = kstrtou8(buf, 10, &val);
-       if (ret)
-               goto error_ret;
-       ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_MASK, 1);
-       if (ret)
-               goto error_ret;
-       if (val)
-               ret = sca3000_write_reg(st,
-                                       SCA3000_REG_ADDR_INT_MASK,
-                                       st->rx[0] | this_attr->address);
-       else
-               ret = sca3000_write_reg(st,
-                                       SCA3000_REG_ADDR_INT_MASK,
-                                       st->rx[0] & ~this_attr->address);
-error_ret:
-       mutex_unlock(&st->lock);
-
-       return ret ? ret : len;
-}
-
-static IIO_DEVICE_ATTR(50_percent, S_IRUGO | S_IWUSR,
-                      sca3000_query_ring_int,
-                      sca3000_set_ring_int,
-                      SCA3000_INT_MASK_RING_HALF);
-
-static IIO_DEVICE_ATTR(75_percent, S_IRUGO | S_IWUSR,
-                      sca3000_query_ring_int,
-                      sca3000_set_ring_int,
-                      SCA3000_INT_MASK_RING_THREE_QUARTER);
-
 static ssize_t sca3000_show_buffer_scale(struct device *dev,
                                         struct device_attribute *attr,
                                         char *buf)
@@ -1399,8 +1332,6 @@ static IIO_DEVICE_ATTR(in_accel_scale,
  * is available via direct reading from registers.
  */
 static const struct attribute *sca3000_ring_attributes[] = {
-       &iio_dev_attr_50_percent.dev_attr.attr,
-       &iio_dev_attr_75_percent.dev_attr.attr,
        &iio_dev_attr_in_accel_scale.dev_attr.attr,
        NULL,
 };
@@ -1491,6 +1422,9 @@ error_ret:
  **/
 static int sca3000_hw_ring_preenable(struct iio_dev *indio_dev)
 {
+       int ret;
+       struct sca3000_state *st = iio_priv(indio_dev);
+
        /*
         * Set stuff to read to indicate no data present.
         * Need for cases where the interrupt had fired at the
@@ -1504,12 +1438,49 @@ static int sca3000_hw_ring_preenable(struct iio_dev *indio_dev)
         */
        indio_dev->buffer->bytes_per_datum = 6;
 
+       mutex_lock(&st->lock);
+
+       /* Enable the 50% full interrupt */
+       ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_MASK, 1);
+       if (ret)
+               goto error_unlock;
+       ret = sca3000_write_reg(st,
+                               SCA3000_REG_ADDR_INT_MASK,
+                               st->rx[0] | SCA3000_INT_MASK_RING_HALF);
+       if (ret)
+               goto error_unlock;
+
+       mutex_unlock(&st->lock);
+
        return __sca3000_hw_ring_state_set(indio_dev, 1);
+
+error_unlock:
+       mutex_unlock(&st->lock);
+
+       return ret;
 }
 
 static int sca3000_hw_ring_postdisable(struct iio_dev *indio_dev)
 {
-       return __sca3000_hw_ring_state_set(indio_dev, 0);
+       int ret;
+       struct sca3000_state *st = iio_priv(indio_dev);
+
+       ret = __sca3000_hw_ring_state_set(indio_dev, 0);
+       if (ret)
+               return ret;
+
+       /* Disable the 50% full interrupt */
+       mutex_lock(&st->lock);
+
+       ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_MASK, 1);
+       if (ret)
+               goto unlock;
+       ret = sca3000_write_reg(st,
+                               SCA3000_REG_ADDR_INT_MASK,
+                               st->rx[0] & ~SCA3000_INT_MASK_RING_HALF);
+unlock:
+       mutex_unlock(&st->lock);
+       return ret;
 }
 
 static const struct iio_buffer_setup_ops sca3000_ring_setup_ops = {