From a2396dfc63d4b133d0b820db978065367529f6ac Mon Sep 17 00:00:00 2001 From: Michael Hennerich Date: Thu, 24 Feb 2011 22:19:50 +0100 Subject: [PATCH] IIO: ADC: AD799x: 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/ad799x.h | 1 + drivers/staging/iio/adc/ad799x_core.c | 12 ++++++++++ drivers/staging/iio/adc/ad799x_ring.c | 43 +++++++++++++---------------------- 3 files changed, 29 insertions(+), 27 deletions(-) diff --git a/drivers/staging/iio/adc/ad799x.h b/drivers/staging/iio/adc/ad799x.h index 81a20d5..a421362 100644 --- a/drivers/staging/iio/adc/ad799x.h +++ b/drivers/staging/iio/adc/ad799x.h @@ -116,6 +116,7 @@ struct ad799x_state { struct work_struct poll_work; struct work_struct work_thresh; atomic_t protect_ring; + size_t d_size; struct iio_trigger *trig; struct regulator *reg; s64 last_timestamp; diff --git a/drivers/staging/iio/adc/ad799x_core.c b/drivers/staging/iio/adc/ad799x_core.c index 89ccf37..e50841b 100644 --- a/drivers/staging/iio/adc/ad799x_core.c +++ b/drivers/staging/iio/adc/ad799x_core.c @@ -123,6 +123,9 @@ static AD799X_SCAN_EL(5); static AD799X_SCAN_EL(6); static AD799X_SCAN_EL(7); +static IIO_SCAN_EL_TIMESTAMP(8); +static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64) + static ssize_t ad799x_show_type(struct device *dev, struct device_attribute *attr, char *buf) @@ -471,6 +474,9 @@ static struct attribute *ad7991_5_9_3_4_scan_el_attrs[] = { &iio_const_attr_in2_index.dev_attr.attr, &iio_scan_el_in3.dev_attr.attr, &iio_const_attr_in3_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, }; @@ -497,6 +503,9 @@ static struct attribute *ad7992_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, }; @@ -541,6 +550,9 @@ static struct attribute *ad7997_8_scan_el_attrs[] = { &iio_const_attr_in6_index.dev_attr.attr, &iio_scan_el_in7.dev_attr.attr, &iio_const_attr_in7_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, }; diff --git a/drivers/staging/iio/adc/ad799x_ring.c b/drivers/staging/iio/adc/ad799x_ring.c index 975cdcb..56abc39 100644 --- a/drivers/staging/iio/adc/ad799x_ring.c +++ b/drivers/staging/iio/adc/ad799x_ring.c @@ -73,8 +73,6 @@ static int ad799x_ring_preenable(struct iio_dev *indio_dev) { struct iio_ring_buffer *ring = indio_dev->ring; struct ad799x_state *st = indio_dev->dev_data; - size_t d_size; - unsigned long numvals; /* * Need to figure out the current mode based upon the requested @@ -84,15 +82,19 @@ static int ad799x_ring_preenable(struct iio_dev *indio_dev) if (st->id == ad7997 || st->id == ad7998) ad799x_set_scan_mode(st, ring->scan_mask); - numvals = ring->scan_count; + st->d_size = ring->scan_count * 2; - if (ring->access.set_bytes_per_datum) { - d_size = numvals*2 + sizeof(s64); - if (d_size % 8) - d_size += 8 - (d_size % 8); - ring->access.set_bytes_per_datum(ring, d_size); + 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; } @@ -130,29 +132,13 @@ static void ad799x_poll_bh_to_ring(struct work_struct *work_s) s64 time_ns; __u8 *rxbuf; int b_sent; - size_t d_size; u8 cmd; - unsigned long numvals = ring->scan_count; - - /* Ensure the timestamp is 8 byte aligned */ - d_size = numvals*2 + 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; - /* Monitor mode prevents reading. Whilst not currently implemented - * might as well have this test in here in the meantime as it does - * no harm. - */ - if (numvals == 0) - return; - - rxbuf = kmalloc(d_size, GFP_KERNEL); + rxbuf = kmalloc(st->d_size, GFP_KERNEL); if (rxbuf == NULL) return; @@ -177,13 +163,15 @@ static void ad799x_poll_bh_to_ring(struct work_struct *work_s) } b_sent = i2c_smbus_read_i2c_block_data(st->client, - cmd, numvals*2, rxbuf); + cmd, ring->scan_count * 2, rxbuf); if (b_sent < 0) goto done; time_ns = iio_get_time_ns(); - memcpy(rxbuf + d_size - sizeof(s64), &time_ns, sizeof(time_ns)); + if (ring->scan_timestamp) + memcpy(rxbuf + st->d_size - sizeof(s64), + &time_ns, sizeof(time_ns)); ring->access.store_to(&ring_sw->buf, rxbuf, time_ns); done: @@ -213,6 +201,7 @@ int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev) indio_dev->ring->preenable = &ad799x_ring_preenable; indio_dev->ring->postenable = &iio_triggered_ring_postenable; indio_dev->ring->predisable = &iio_triggered_ring_predisable; + indio_dev->ring->scan_timestamp = true; INIT_WORK(&st->poll_work, &ad799x_poll_bh_to_ring); -- 2.7.4