From e08d02658cac30a826565d2faebb74586f60d601 Mon Sep 17 00:00:00 2001 From: Michael Hennerich Date: Thu, 24 Feb 2011 22:19:48 +0100 Subject: [PATCH] IIO: ADC: AD7887: Update timestamp handling Add timestamp attributes. Revise timestamp handling accordingly. Preset timestamp generation. Signed-off-by: Michael Hennerich Acked-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/staging/iio/adc/ad7887.h | 1 + drivers/staging/iio/adc/ad7887_ring.c | 36 ++++++++++++++++----------- 2 files changed, 22 insertions(+), 15 deletions(-) diff --git a/drivers/staging/iio/adc/ad7887.h b/drivers/staging/iio/adc/ad7887.h index 8c2a218c9496..439c802b38f2 100644 --- a/drivers/staging/iio/adc/ad7887.h +++ b/drivers/staging/iio/adc/ad7887.h @@ -63,6 +63,7 @@ struct ad7887_state { struct regulator *reg; struct work_struct poll_work; atomic_t protect_ring; + size_t d_size; u16 int_vref_mv; bool en_dual; struct spi_transfer xfer[4]; diff --git a/drivers/staging/iio/adc/ad7887_ring.c b/drivers/staging/iio/adc/ad7887_ring.c index 6b9cb1f95a1e..2d7fe65049dd 100644 --- a/drivers/staging/iio/adc/ad7887_ring.c +++ b/drivers/staging/iio/adc/ad7887_ring.c @@ -27,6 +27,8 @@ static IIO_SCAN_EL_C(in0, 0, 0, NULL); static IIO_SCAN_EL_C(in1, 1, 0, NULL); +static IIO_SCAN_EL_TIMESTAMP(2); +static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64); static ssize_t ad7887_show_type(struct device *dev, struct device_attribute *attr, @@ -47,6 +49,9 @@ static struct attribute *ad7887_scan_el_attrs[] = { &iio_const_attr_in0_index.dev_attr.attr, &iio_scan_el_in1.dev_attr.attr, &iio_const_attr_in1_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, }; @@ -118,16 +123,20 @@ static int ad7887_ring_preenable(struct iio_dev *indio_dev) { struct ad7887_state *st = indio_dev->dev_data; struct iio_ring_buffer *ring = indio_dev->ring; - size_t d_size; - 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); + switch (ring->scan_mask) { case (1 << 0): st->ring_msg = &st->msg[AD7887_CH0]; @@ -186,20 +195,14 @@ static void ad7887_poll_bh_to_ring(struct work_struct *work_s) s64 time_ns; __u8 *buf; int b_sent; - size_t d_size; unsigned int bytes = ring->scan_count * st->chip_info->storagebits / 8; - /* Ensure the timestamp is 8 byte aligned */ - d_size = bytes + 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; - buf = kzalloc(d_size, GFP_KERNEL); + buf = kzalloc(st->d_size, GFP_KERNEL); if (buf == NULL) return; @@ -210,7 +213,9 @@ static void ad7887_poll_bh_to_ring(struct work_struct *work_s) time_ns = iio_get_time_ns(); memcpy(buf, st->data, bytes); - memcpy(buf + d_size - sizeof(s64), &time_ns, sizeof(time_ns)); + if (ring->scan_timestamp) + memcpy(buf + st->d_size - sizeof(s64), + &time_ns, sizeof(time_ns)); indio_dev->ring->access.store_to(&sw_ring->buf, buf, time_ns); done: @@ -241,6 +246,7 @@ int ad7887_register_ring_funcs_and_init(struct iio_dev *indio_dev) indio_dev->ring->predisable = &iio_triggered_ring_predisable; indio_dev->ring->postdisable = &ad7887_ring_postdisable; indio_dev->ring->scan_el_attrs = &ad7887_scan_el_group; + indio_dev->ring->scan_timestamp = true; INIT_WORK(&st->poll_work, &ad7887_poll_bh_to_ring); -- 2.20.1