staging:iio:ad7606: Move buffer code to main source file

Currently the ad7606 buffer handling code resides in its own source file.
But this file contains only 4 small functions of which half are just
wrappers around other functions. Buffer support is also always enabled for
this driver, so move them over to the main source file. This reduces the
amount of boilerplate code.

Also rename the main function from ad7606_core.c to ad7606.c since there is
only a single file now.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/staging/iio/adc/Makefile

@@ -2,7 +2,6 @@
 # Makefile for industrial I/O ADC drivers
 #
 
-ad7606-y := ad7606_core.o ad7606_ring.o
 obj-$(CONFIG_AD7606_IFACE_PARALLEL) += ad7606_par.o
 obj-$(CONFIG_AD7606_IFACE_SPI) += ad7606_spi.o
 obj-$(CONFIG_AD7606) += ad7606.o

drivers/staging/iio/adc/ad7606_core.c → drivers/staging/iio/adc/ad7606.c

@@ -21,10 +21,12 @@
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 #include <linux/iio/buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
 
 #include "ad7606.h"
 
-int ad7606_reset(struct ad7606_state *st)
+static int ad7606_reset(struct ad7606_state *st)
 {
 	if (st->gpio_reset) {
 		gpiod_set_value(st->gpio_reset, 1);
@@ -36,7 +38,7 @@ int ad7606_reset(struct ad7606_state *st)
 	return -ENODEV;
 }
 
-int ad7606_read_samples(struct ad7606_state *st)
+static int ad7606_read_samples(struct ad7606_state *st)
 {
 	unsigned int num = st->chip_info->num_channels;
 	u16 *data = st->data;
@@ -69,6 +71,41 @@ int ad7606_read_samples(struct ad7606_state *st)
 	return st->bops->read_block(st->dev, num, data);
 }
 
+static irqreturn_t ad7606_trigger_handler(int irq, void *p)
+{
+	struct iio_poll_func *pf = p;
+	struct ad7606_state *st = iio_priv(pf->indio_dev);
+
+	gpiod_set_value(st->gpio_convst, 1);
+
+	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
+ *
+ * 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 ad7606_poll_bh_to_ring(struct work_struct *work_s)
+{
+	struct ad7606_state *st = container_of(work_s, struct ad7606_state,
+						poll_work);
+	struct iio_dev *indio_dev = iio_priv_to_dev(st);
+	int ret;
+
+	ret = ad7606_read_samples(st);
+	if (ret == 0)
+		iio_push_to_buffers_with_timestamp(indio_dev, st->data,
+						   iio_get_time_ns(indio_dev));
+
+	gpiod_set_value(st->gpio_convst, 0);
+	iio_trigger_notify_done(indio_dev->trig);
+}
+
 static int ad7606_scan_direct(struct iio_dev *indio_dev, unsigned int ch)
 {
 	struct ad7606_state *st = iio_priv(indio_dev);
@@ -385,6 +422,7 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
 	st->base_address = base_address;
 	st->range = 5000;
 	st->oversampling = 1;
+	INIT_WORK(&st->poll_work, &ad7606_poll_bh_to_ring);
 
 	st->reg = devm_regulator_get(dev, "vcc");
 	if (!IS_ERR(st->reg)) {
@@ -427,7 +465,8 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
 	if (ret)
 		goto error_disable_reg;
 
-	ret = ad7606_register_ring_funcs_and_init(indio_dev);
+	ret = iio_triggered_buffer_setup(indio_dev, &ad7606_trigger_handler,
+					 NULL, NULL);
 	if (ret)
 		goto error_free_irq;
 
@@ -439,7 +478,7 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
 
 	return 0;
 error_unregister_ring:
-	ad7606_ring_cleanup(indio_dev);
+	iio_triggered_buffer_cleanup(indio_dev);
 
 error_free_irq:
 	free_irq(irq, indio_dev);
@@ -457,7 +496,7 @@ int ad7606_remove(struct device *dev, int irq)
 	struct ad7606_state *st = iio_priv(indio_dev);
 
 	iio_device_unregister(indio_dev);
-	ad7606_ring_cleanup(indio_dev);
+	iio_triggered_buffer_cleanup(indio_dev);
 
 	free_irq(irq, indio_dev);
 	if (!IS_ERR(st->reg))

drivers/staging/iio/adc/ad7606.h

@@ -61,18 +61,13 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
 		 const char *name, unsigned int id,
 		 const struct ad7606_bus_ops *bops);
 int ad7606_remove(struct device *dev, int irq);
-int ad7606_reset(struct ad7606_state *st);
-int ad7606_read_samples(struct ad7606_state *st);
 
 enum ad7606_supported_device_ids {
 	ID_AD7606_8,
 	ID_AD7606_6,
 	ID_AD7606_4
 };
 
-int ad7606_register_ring_funcs_and_init(struct iio_dev *indio_dev);
-void ad7606_ring_cleanup(struct iio_dev *indio_dev);
-
 #ifdef CONFIG_PM_SLEEP
 extern const struct dev_pm_ops ad7606_pm_ops;
 #define AD7606_PM_OPS (&ad7606_pm_ops)