staging:iio:adc:ad7606 conversion to irq_chip based polling.

I'm far from sure what the best way to handle this particular
part is, so have (I think) done the absolute minimum to change
it to the new interface.

V2: Trivial constification of device name.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/adc/ad7606.h

@@ -50,7 +50,7 @@ struct ad7606_platform_data {
  */
 
 struct ad7606_chip_info {
-	char				name[10];
+	const char			*name;
 	u8				bits;
 	char				sign;
 	u16				int_vref_mv;

drivers/staging/iio/adc/ad7606_core.c

@@ -458,6 +458,7 @@ struct ad7606_state *ad7606_probe(struct device *dev, int irq,
 	st->indio_dev->dev_data = (void *)(st);
 	st->indio_dev->driver_module = THIS_MODULE;
 	st->indio_dev->modes = INDIO_DIRECT_MODE;
+	st->indio_dev->name = st->chip_info->name;
 
 	init_waitqueue_head(&st->wq_data_avail);
 

drivers/staging/iio/adc/ad7606_ring.c

@@ -157,16 +157,19 @@ static int ad7606_ring_preenable(struct iio_dev *indio_dev)
 }
 
 /**
- * ad7606_poll_func_th() th of trigger launched polling to ring buffer
+ * ad7606_trigger_handler_th() th of trigger launched polling to ring buffer
  *
  **/
-static void ad7606_poll_func_th(struct iio_dev *indio_dev, s64 time)
+static irqreturn_t ad7606_trigger_handler_th(int irq, void *p)
 {
+	struct iio_poll_func *pf = p;
+	struct iio_dev *indio_dev = pf->private_data;
 	struct ad7606_state *st = indio_dev->dev_data;
 	gpio_set_value(st->pdata->gpio_convst, 1);
 
-	return;
+	return IRQ_HANDLED;
 }
+
 /**
  * ad7606_poll_bh_to_ring() bh of trigger launched polling to ring buffer
  * @work_s:	the work struct through which this was scheduled
@@ -245,10 +248,20 @@ int ad7606_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, &ad7606_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 = &ad7606_trigger_handler_th;
+	indio_dev->pollfunc->name =
+		kasprintf(GFP_KERNEL, "%s_consumer%d", indio_dev->name,
+			  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 = &ad7606_ring_preenable;
@@ -262,6 +275,8 @@ int ad7606_register_ring_funcs_and_init(struct iio_dev *indio_dev)
 	/* 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:
@@ -275,6 +290,7 @@ void ad7606_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);
 }