From: Michael Hennerich <[email protected]> Add timestamp attributes. Revise timestamp handling accordingly. Preset timestamp generation.
Signed-off-by: Michael Hennerich <[email protected]> Acked-by: Jonathan Cameron <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/staging/iio/adc/ad7476.h | 1 + drivers/staging/iio/adc/ad7476_ring.c | 37 +++++++++++++++++++------------- 2 files changed, 23 insertions(+), 15 deletions(-) diff --git a/drivers/staging/iio/adc/ad7476.h b/drivers/staging/iio/adc/ad7476.h index b51b49e..f917e9c 100644 --- a/drivers/staging/iio/adc/ad7476.h +++ b/drivers/staging/iio/adc/ad7476.h @@ -33,6 +33,7 @@ struct ad7476_state { struct regulator *reg; struct work_struct poll_work; atomic_t protect_ring; + 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 85de142..1d654c8 100644 --- a/drivers/staging/iio/adc/ad7476_ring.c +++ b/drivers/staging/iio/adc/ad7476_ring.c @@ -26,6 +26,8 @@ #include "ad7476.h" static IIO_SCAN_EL_C(in0, 0, 0, NULL); +static IIO_SCAN_EL_TIMESTAMP(1); +static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64); static ssize_t ad7476_show_type(struct device *dev, struct device_attribute *attr, @@ -44,6 +46,9 @@ static IIO_DEVICE_ATTR(in_type, S_IRUGO, ad7476_show_type, NULL, 0); static struct attribute *ad7476_scan_el_attrs[] = { &iio_scan_el_in0.dev_attr.attr, &iio_const_attr_in0_index.dev_attr.attr, + &iio_const_attr_timestamp_index.dev_attr.attr, + &iio_scan_el_timestamp.dev_attr.attr, + &iio_const_attr_timestamp_type.dev_attr.attr, &iio_dev_attr_in_type.dev_attr.attr, NULL, }; @@ -86,16 +91,21 @@ error_ret: static int ad7476_ring_preenable(struct iio_dev *indio_dev) { struct ad7476_state *st = indio_dev->dev_data; - size_t d_size; + struct iio_ring_buffer *ring = indio_dev->ring; - if (indio_dev->ring->access.set_bytes_per_datum) { - d_size = st->chip_info->storagebits / 8 + sizeof(s64); - if (d_size % 8) - d_size += 8 - (d_size % 8); - indio_dev->ring->access.set_bytes_per_datum(indio_dev->ring, - d_size); + st->d_size = ring->scan_count * st->chip_info->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->ring->access.set_bytes_per_datum) + indio_dev->ring->access.set_bytes_per_datum(indio_dev->ring, + st->d_size); + return 0; } @@ -131,18 +141,12 @@ static void ad7476_poll_bh_to_ring(struct work_struct *work_s) s64 time_ns; __u8 *rxbuf; int b_sent; - size_t d_size; - - /* Ensure the timestamp is 8 byte aligned */ - d_size = st->chip_info->storagebits / 8 + sizeof(s64); - if (d_size % sizeof(s64)) - d_size += sizeof(s64) - (d_size % sizeof(s64)); /* Ensure only one copy of this function running at a time */ if (atomic_inc_return(&st->protect_ring) > 1) return; - rxbuf = kzalloc(d_size, GFP_KERNEL); + rxbuf = kzalloc(st->d_size, GFP_KERNEL); if (rxbuf == NULL) return; @@ -152,7 +156,9 @@ static void ad7476_poll_bh_to_ring(struct work_struct *work_s) time_ns = iio_get_time_ns(); - memcpy(rxbuf + d_size - sizeof(s64), &time_ns, sizeof(time_ns)); + if (indio_dev->ring->scan_timestamp) + memcpy(rxbuf + st->d_size - sizeof(s64), + &time_ns, sizeof(time_ns)); indio_dev->ring->access.store_to(&sw_ring->buf, rxbuf, time_ns); done: @@ -182,6 +188,7 @@ int ad7476_register_ring_funcs_and_init(struct iio_dev *indio_dev) indio_dev->ring->postenable = &iio_triggered_ring_postenable; indio_dev->ring->predisable = &iio_triggered_ring_predisable; indio_dev->ring->scan_el_attrs = &ad7476_scan_el_group; + indio_dev->ring->scan_timestamp = true; INIT_WORK(&st->poll_work, &ad7476_poll_bh_to_ring); -- 1.7.4.1 _______________________________________________ devel mailing list [email protected] http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
