Untested.
Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxx>
---
drivers/staging/iio/adc/ad7887.h | 2 -
drivers/staging/iio/adc/ad7887_core.c | 1 -
drivers/staging/iio/adc/ad7887_ring.c | 63 ++++++++++++++-------------------
3 files changed, 27 insertions(+), 39 deletions(-)
diff --git a/drivers/staging/iio/adc/ad7887.h b/drivers/staging/iio/adc/ad7887.h
index 439c802..ffff403 100644
--- a/drivers/staging/iio/adc/ad7887.h
+++ b/drivers/staging/iio/adc/ad7887.h
@@ -61,8 +61,6 @@ struct ad7887_state {
struct spi_device *spi;
const struct ad7887_chip_info *chip_info;
struct regulator *reg;
- struct work_struct poll_work;
- atomic_t protect_ring;
size_t d_size;
u16 int_vref_mv;
bool en_dual;
diff --git a/drivers/staging/iio/adc/ad7887_core.c b/drivers/staging/iio/adc/ad7887_core.c
index 11c9fcf..42e9cd7 100644
--- a/drivers/staging/iio/adc/ad7887_core.c
+++ b/drivers/staging/iio/adc/ad7887_core.c
@@ -150,7 +150,6 @@ static int __devinit ad7887_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/ad7887_ring.c b/drivers/staging/iio/adc/ad7887_ring.c
index da77f26..8e3653c 100644
--- a/drivers/staging/iio/adc/ad7887_ring.c
+++ b/drivers/staging/iio/adc/ad7887_ring.c
@@ -163,48 +163,27 @@ static int ad7887_ring_postdisable(struct iio_dev *indio_dev)
}
/**
- * ad7887_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 ad7887_poll_func_th(struct iio_dev *indio_dev, s64 time)
-{
- struct ad7887_state *st = indio_dev->dev_data;
-
- schedule_work(&st->poll_work);
- return;
-}
-/**
- * ad7887_poll_bh_to_ring() bh of trigger launched polling to ring buffer
- * @work_s: the work struct through which this was scheduled
+ * ad7887_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 ad7887_poll_bh_to_ring(struct work_struct *work_s)
+static irqreturn_t ad7887_trigger_handler(int irq, void *p)
{
- struct ad7887_state *st = container_of(work_s, struct ad7887_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 ad7887_state *st = iio_dev_get_devdata(indio_dev);
struct iio_ring_buffer *ring = indio_dev->ring;
+ struct iio_sw_ring_buffer *sw_ring = iio_to_sw_ring(indio_dev->ring);
s64 time_ns;
__u8 *buf;
int b_sent;
unsigned int bytes = ring->scan_count * st->chip_info->storagebits / 8;
- /* Ensure only one copy of this function running at a time */
- if (atomic_inc_return(&st->protect_ring) > 1)
- return;
-
buf = kzalloc(st->d_size, GFP_KERNEL);
if (buf == NULL)
- return;
+ return -ENOMEM;
b_sent = spi_sync(st->spi, st->ring_msg);
if (b_sent)
@@ -214,18 +193,17 @@ static void ad7887_poll_bh_to_ring(struct work_struct *work_s)
memcpy(buf, st->data, bytes);
if (ring->scan_timestamp)
- memcpy(buf + st->d_size - sizeof(s64),
- &time_ns, sizeof(time_ns));
+ 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:
kfree(buf);
- atomic_dec(&st->protect_ring);
+
+ return IRQ_HANDLED;
}
int ad7887_register_ring_funcs_and_init(struct iio_dev *indio_dev)
{
- struct ad7887_state *st = indio_dev->dev_data;
int ret;
indio_dev->ring = iio_sw_rb_allocate(indio_dev);
@@ -235,10 +213,22 @@ int ad7887_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, &ad7887_poll_func_th);
- if (ret)
+ 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->h = &iio_pollfunc_store_time;
+ indio_dev->pollfunc->thread = &ad7887_trigger_handler;
+ indio_dev->pollfunc->type = IRQF_ONESHOT;
+ indio_dev->pollfunc->name =
+ kasprintf(GFP_KERNEL, "ad7887_consumer%d", indio_dev->id);
+ if (indio_dev->pollfunc->name == NULL) {
+ ret = -ENOMEM;
+ goto error_free_pollfunc;
+ }
/* Ring buffer functions - here trigger setup related */
indio_dev->ring->preenable = &ad7887_ring_preenable;
@@ -248,11 +238,11 @@ int ad7887_register_ring_funcs_and_init(struct iio_dev *indio_dev)
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);
-
/* Flag that polled ring buffering is possible */
indio_dev->modes |= INDIO_RING_TRIGGERED;
return 0;
+error_free_pollfunc:
+ kfree(indio_dev->pollfunc);
error_deallocate_sw_rb:
iio_sw_rb_free(indio_dev->ring);
error_ret:
@@ -267,6 +257,7 @@ void ad7887_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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