Untested. This one is of a different form, so worth a closer look than
the previous incredibly similar patches (which were based on the
adis16400 that I have tested).
Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxx>
---
drivers/staging/iio/adc/ad7298.h | 2 -
drivers/staging/iio/adc/ad7298_core.c | 1 -
drivers/staging/iio/adc/ad7298_ring.c | 65 +++++++++++++--------------------
3 files changed, 26 insertions(+), 42 deletions(-)
diff --git a/drivers/staging/iio/adc/ad7298.h b/drivers/staging/iio/adc/ad7298.h
index fe7ed77..8d149c8 100644
--- a/drivers/staging/iio/adc/ad7298.h
+++ b/drivers/staging/iio/adc/ad7298.h
@@ -40,8 +40,6 @@ struct ad7298_state {
struct iio_dev *indio_dev;
struct spi_device *spi;
struct regulator *reg;
- struct work_struct poll_work;
- atomic_t protect_ring;
size_t d_size;
u16 int_vref_mv;
unsigned ext_ref;
diff --git a/drivers/staging/iio/adc/ad7298_core.c b/drivers/staging/iio/adc/ad7298_core.c
index 8b3a490..5a60481 100644
--- a/drivers/staging/iio/adc/ad7298_core.c
+++ b/drivers/staging/iio/adc/ad7298_core.c
@@ -170,7 +170,6 @@ static int __devinit ad7298_probe(struct spi_device *spi)
spi_set_drvdata(spi, st);
- atomic_set(&st->protect_ring, 0);
st->spi = spi;
st->indio_dev = iio_allocate_device(0);
diff --git a/drivers/staging/iio/adc/ad7298_ring.c b/drivers/staging/iio/adc/ad7298_ring.c
index 9068d7f..1b9752c 100644
--- a/drivers/staging/iio/adc/ad7298_ring.c
+++ b/drivers/staging/iio/adc/ad7298_ring.c
@@ -7,7 +7,6 @@
*/
#include <linux/interrupt.h>
-#include <linux/workqueue.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/slab.h>
@@ -155,47 +154,24 @@ static int ad7298_ring_preenable(struct iio_dev *indio_dev)
}
/**
- * ad7298_poll_func_th() th of trigger launched polling to ring buffer
- *
- * As sampling only occurs on spi comms occurring, leave timestamping until
- * then. Some triggers will generate their own time stamp. Currently
- * there is no way of notifying them when no one cares.
- **/
-static void ad7298_poll_func_th(struct iio_dev *indio_dev, s64 time)
-{
- struct ad7298_state *st = indio_dev->dev_data;
-
- schedule_work(&st->poll_work);
- return;
-}
-
-/**
- * ad7298_poll_bh_to_ring() bh of trigger launched polling to ring buffer
- * @work_s: the work struct through which this was scheduled
+ * ad7298_trigger_handler() bh of trigger launched polling to ring buffer
*
* Currently there is no option in this driver to disable the saving of
* timestamps within the ring.
- * I think the one copy of this at a time was to avoid problems if the
- * trigger was set far too high and the reads then locked up the computer.
**/
-static void ad7298_poll_bh_to_ring(struct work_struct *work_s)
+static irqreturn_t ad7298_trigger_handler(int irq, void *p)
{
- struct ad7298_state *st = container_of(work_s, struct ad7298_state,
- poll_work);
- struct iio_dev *indio_dev = st->indio_dev;
- struct iio_sw_ring_buffer *sw_ring = iio_to_sw_ring(indio_dev->ring);
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->private_data;
+ struct ad7298_state *st = iio_dev_get_devdata(indio_dev);
struct iio_ring_buffer *ring = indio_dev->ring;
s64 time_ns;
__u16 buf[16];
int b_sent, i;
- /* Ensure only one copy of this function running at a time */
- if (atomic_inc_return(&st->protect_ring) > 1)
- return;
-
b_sent = spi_sync(st->spi, &st->ring_msg);
if (b_sent)
- goto done;
+ return b_sent;
if (ring->scan_timestamp) {
time_ns = iio_get_time_ns();
@@ -206,14 +182,13 @@ static void ad7298_poll_bh_to_ring(struct work_struct *work_s)
for (i = 0; i < ring->scan_count; i++)
buf[i] = be16_to_cpu(st->rx_buf[i]);
- indio_dev->ring->access.store_to(&sw_ring->buf, (u8 *)buf, time_ns);
-done:
- atomic_dec(&st->protect_ring);
+ indio_dev->ring->access.store_to(ring, (u8 *)buf, time_ns);
+
+ return IRQ_HANDLED;
}
int ad7298_register_ring_funcs_and_init(struct iio_dev *indio_dev)
{
- struct ad7298_state *st = indio_dev->dev_data;
int ret;
indio_dev->ring = iio_sw_rb_allocate(indio_dev);
@@ -223,10 +198,21 @@ int ad7298_register_ring_funcs_and_init(struct iio_dev *indio_dev)
}
/* Effectively select the ring buffer implementation */
iio_ring_sw_register_funcs(&indio_dev->ring->access);
- ret = iio_alloc_pollfunc(indio_dev, NULL, &ad7298_poll_func_th);
- if (ret)
- goto error_deallocate_sw_rb;
+ indio_dev->pollfunc = kzalloc(sizeof(*indio_dev->pollfunc), GFP_KERNEL);
+ if (indio_dev->pollfunc == NULL) {
+ ret = -ENOMEM;
+ goto error_deallocate_sw_rb;
+ }
+ indio_dev->pollfunc->private_data = indio_dev;
+ indio_dev->pollfunc->thread = &ad7298_trigger_handler;
+ indio_dev->pollfunc->type = IRQF_ONESHOT;
+ indio_dev->pollfunc->name =
+ kasprintf(GFP_KERNEL, "ad7298_consumer%d", indio_dev->id);
+ if (indio_dev->pollfunc->name == NULL) {
+ ret = -ENOMEM;
+ goto error_free_poll_func;
+ }
/* Ring buffer functions - here trigger setup related */
indio_dev->ring->preenable = &ad7298_ring_preenable;
@@ -235,11 +221,11 @@ int ad7298_register_ring_funcs_and_init(struct iio_dev *indio_dev)
indio_dev->ring->scan_el_attrs = &ad7298_scan_el_group;
indio_dev->ring->scan_timestamp = true;
- INIT_WORK(&st->poll_work, &ad7298_poll_bh_to_ring);
-
/* Flag that polled ring buffering is possible */
indio_dev->modes |= INDIO_RING_TRIGGERED;
return 0;
+error_free_poll_func:
+ kfree(indio_dev->pollfunc);
error_deallocate_sw_rb:
iio_sw_rb_free(indio_dev->ring);
error_ret:
@@ -253,6 +239,7 @@ void ad7298_ring_cleanup(struct iio_dev *indio_dev)
iio_trigger_dettach_poll_func(indio_dev->trig,
indio_dev->pollfunc);
}
+ kfree(indio_dev->pollfunc->name);
kfree(indio_dev->pollfunc);
iio_sw_rb_free(indio_dev->ring);
}
--
1.7.3.4
--
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