staging:iio:adc:ad7476 use iio_sw_buffer_preenable instead of local version.

Now the generic version caches the scan size the version in this driver
is redundant.

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/iio/adc/ad7476.h b/drivers/staging/iio/adc/ad7476.h
index 27f696c..b1dd931 100644 (file)
--- a/drivers/staging/iio/adc/ad7476.h
+++ b/drivers/staging/iio/adc/ad7476.h
@@ -27,7 +27,6 @@ struct ad7476_state {
        struct spi_device               *spi;
        const struct ad7476_chip_info   *chip_info;
        struct regulator                *reg;
-       size_t                          d_size;
        u16                             int_vref_mv;
        struct spi_transfer             xfer;
        struct spi_message              msg;

diff --git a/drivers/staging/iio/adc/ad7476_ring.c b/drivers/staging/iio/adc/ad7476_ring.c
index d6af6c0..a090bc3 100644 (file)
--- a/drivers/staging/iio/adc/ad7476_ring.c
+++ b/drivers/staging/iio/adc/ad7476_ring.c
@@ -20,36 +20,6 @@
 
 #include "ad7476.h"
 
-/**
- * ad7476_ring_preenable() setup the parameters of the ring before enabling
- *
- * The complex nature of the setting of the number of bytes per datum is due
- * to this driver currently ensuring that the timestamp is stored at an 8
- * byte boundary.
- **/
-static int ad7476_ring_preenable(struct iio_dev *indio_dev)
-{
-       struct ad7476_state *st = iio_priv(indio_dev);
-       struct iio_buffer *ring = indio_dev->buffer;
-
-       st->d_size = bitmap_weight(indio_dev->active_scan_mask,
-                                  indio_dev->masklength) *
-               st->chip_info->channel[0].scan_type.storagebits / 8;
-
-       if (ring->scan_timestamp) {
-               st->d_size += sizeof(s64);
-
-               if (st->d_size % sizeof(s64))
-                       st->d_size += sizeof(s64) - (st->d_size % sizeof(s64));
-       }
-
-       if (indio_dev->buffer->access->set_bytes_per_datum)
-               indio_dev->buffer->access->
-                       set_bytes_per_datum(indio_dev->buffer, st->d_size);
-
-       return 0;
-}
-
 static irqreturn_t ad7476_trigger_handler(int irq, void  *p)
 {
        struct iio_poll_func *pf = p;
@@ -59,7 +29,7 @@ static irqreturn_t ad7476_trigger_handler(int irq, void  *p)
        __u8 *rxbuf;
        int b_sent;
 
-       rxbuf = kzalloc(st->d_size, GFP_KERNEL);
+       rxbuf = kzalloc(indio_dev->scan_bytes, GFP_KERNEL);
        if (rxbuf == NULL)
                return -ENOMEM;
 
@@ -71,7 +41,7 @@ static irqreturn_t ad7476_trigger_handler(int irq, void  *p)
        time_ns = iio_get_time_ns();
 
        if (indio_dev->buffer->scan_timestamp)
-               memcpy(rxbuf + st->d_size - sizeof(s64),
+               memcpy(rxbuf + indio_dev->scan_bytes - sizeof(s64),
                        &time_ns, sizeof(time_ns));
 
        indio_dev->buffer->access->store_to(indio_dev->buffer, rxbuf, time_ns);
@@ -83,7 +53,7 @@ done:
 }
 
 static const struct iio_buffer_setup_ops ad7476_ring_setup_ops = {
-       .preenable = &ad7476_ring_preenable,
+       .preenable = &iio_sw_buffer_preenable,
        .postenable = &iio_triggered_buffer_postenable,
        .predisable = &iio_triggered_buffer_predisable,
 };