The hrtimer sw-trigger allow for polling mode on devices w/o hard irq
trigger source, but setting the frequency from userland for both the
hrtimer trigger device and the adc is error prone.
Make adc drivers able to setup the sw-trigger at the last second when the
buffer is enabled, and the sampling frequency is known.
enable_trigger is called from verify_update, before the classical setup_ops
are called in buffers_enable. This gives a chance to complete the setup of
indio_dev->trig.
Signed-off-by: Marc Titinger <mtitinger@xxxxxxxxxxxx>
---
drivers/iio/industrialio-buffer.c | 5 +++++
include/linux/iio/iio.h | 3 +++
2 files changed, 8 insertions(+)
diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index d7e908a..ba7abd4 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -647,6 +647,11 @@ static int iio_verify_update(struct iio_dev *indio_dev,
if (insert_buffer)
modes &= insert_buffer->access->modes;
+ if (indio_dev->setup_ops &&
+ indio_dev->setup_ops->enable_trigger &&
+ (indio_dev->setup_ops->enable_trigger(indio_dev) < 0))
+ return -ENXIO;
+
/* Definitely possible for devices to support both of these. */
if ((modes & INDIO_BUFFER_TRIGGERED) && indio_dev->trig) {
config->mode = INDIO_BUFFER_TRIGGERED;
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index 7bb7f67..8f82113 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -419,6 +419,8 @@ struct iio_info {
/**
* struct iio_buffer_setup_ops - buffer setup related callbacks
+ * @enable_trigger: [DRIVER] function to call if a trigger is instancied
+ * upon enabling the buffer (sw triggers)
* @preenable: [DRIVER] function to run prior to marking buffer enabled
* @postenable: [DRIVER] function to run after marking buffer enabled
* @predisable: [DRIVER] function to run prior to marking buffer
@@ -428,6 +430,7 @@ struct iio_info {
* scan mask is valid for the device.
*/
struct iio_buffer_setup_ops {
+ int (*enable_trigger)(struct iio_dev *);
int (*preenable)(struct iio_dev *);
int (*postenable)(struct iio_dev *);
int (*predisable)(struct iio_dev *);
--
1.9.1
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