staging:iio:trigger handle name attr in core, remove old alloc and register any control_attrs via struct device

As the majority of triggers don't actually have any other control_attrs lets use the fact
that struct device has a groups element when we do need to have these attributes registered.
A vargs function is used to cut down on lots of building strings in every single driver
just in order to pass them into the allocate.

Also iio_allocate_trigger_named -> iio_allocate_trigger as there is no
unamed version any more, so that is now just confusing.

Blackfin tested and fixed by Michael Hennerich.

V2: Elements from Michael Hennerich's patches for the ade7758

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 2 insertions, 23 deletions

diff --git a/drivers/staging/iio/accel/adis16240_trigger.c b/drivers/staging/iio/accel/adis16240_trigger.c
index d5bda92..ece3ca8 100644
--- a/drivers/staging/iio/accel/adis16240_trigger.c
+++ b/drivers/staging/iio/accel/adis16240_trigger.c
@@ -21,17 +21,6 @@ static irqreturn_t adis16240_data_rdy_trig_poll(int irq, void *trig)
 	return IRQ_HANDLED;
 }
 
-static IIO_TRIGGER_NAME_ATTR;
-
-static struct attribute *adis16240_trigger_attrs[] = {
-	&dev_attr_name.attr,
-	NULL,
-};
-
-static const struct attribute_group adis16240_trigger_attr_group = {
-	.attrs = adis16240_trigger_attrs,
-};
-
 /**
  * adis16240_data_rdy_trigger_set_state() set datardy interrupt state
  **/
@@ -49,17 +38,11 @@ int adis16240_probe_trigger(struct iio_dev *indio_dev)
 {
 	int ret;
 	struct adis16240_state *st = indio_dev->dev_data;
-	char *name;
 
-	name = kasprintf(GFP_KERNEL, "adis16240-dev%d", indio_dev->id);
-	if (name == NULL) {
-		ret = -ENOMEM;
-		goto error_ret;
-	}
-	st->trig = iio_allocate_trigger_named(name);
+	st->trig = iio_allocate_trigger("adis16240-dev%d", indio_dev->id);
 	if (st->trig == NULL) {
 		ret = -ENOMEM;
-		goto error_free_name;
+		goto error_ret;
 	}
 
 	ret = request_irq(st->us->irq,
@@ -74,7 +57,6 @@ int adis16240_probe_trigger(struct iio_dev *indio_dev)
 	st->trig->owner = THIS_MODULE;
 	st->trig->private_data = st;
 	st->trig->set_trigger_state = &adis16240_data_rdy_trigger_set_state;
-	st->trig->control_attrs = &adis16240_trigger_attr_group;
 	ret = iio_trigger_register(st->trig);
 
 	/* select default trigger */
@@ -88,8 +70,6 @@ error_free_irq:
 	free_irq(st->us->irq, st->trig);
 error_free_trig:
 	iio_free_trigger(st->trig);
-error_free_name:
-	kfree(name);
 error_ret:
 	return ret;
 }
@@ -99,7 +79,6 @@ void adis16240_remove_trigger(struct iio_dev *indio_dev)
 	struct adis16240_state *state = indio_dev->dev_data;
 
 	iio_trigger_unregister(state->trig);
-	kfree(state->trig->name);
 	free_irq(state->us->irq, state->trig);
 	iio_free_trigger(state->trig);
 }