diff --git a/drivers/staging/iio/adc/ad7606.c b/drivers/staging/iio/adc/ad7606.c
index 8a34efa6c0f88611ed5105f11f9f238c1d5af4e2..50d88571e4ac5b3970aca1c3f3f38ff57ac816f4 100644
--- a/drivers/staging/iio/adc/ad7606.c
+++ b/drivers/staging/iio/adc/ad7606.c
@@ -22,6 +22,7 @@
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/trigger.h>
#include <linux/iio/triggered_buffer.h>
#include "ad7606.h"
@@ -86,36 +87,24 @@ static int ad7606_read_samples(struct ad7606_state *st)
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);
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct ad7606_state *st = iio_priv(indio_dev);
int ret;
+ mutex_lock(&st->lock);
+
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);
+ /* The rising edge of the CONVST signal starts a new conversion. */
+ gpiod_set_value(st->gpio_convst, 1);
+
+ mutex_unlock(&st->lock);
+
+ return IRQ_HANDLED;
}
static int ad7606_scan_direct(struct iio_dev *indio_dev, unsigned int ch)
@@ -366,8 +355,11 @@ static int ad7606_request_gpios(struct ad7606_state *st)
return PTR_ERR_OR_ZERO(st->gpio_os);
}
-/**
- * Interrupt handler
+/*
+ * The BUSY signal indicates when conversions are in progress, so when a rising
+ * edge of CONVST is applied, BUSY goes logic high and transitions low at the
+ * end of the entire conversion process. The falling edge of the BUSY signal
+ * triggers this interrupt.
*/
static irqreturn_t ad7606_interrupt(int irq, void *dev_id)
{
@@ -375,7 +367,8 @@ static irqreturn_t ad7606_interrupt(int irq, void *dev_id)
struct ad7606_state *st = iio_priv(indio_dev);
if (iio_buffer_enabled(indio_dev)) {
- schedule_work(&st->poll_work);
+ gpiod_set_value(st->gpio_convst, 0);
+ iio_trigger_poll_chained(st->trig);
} else {
complete(&st->completion);
}
@@ -383,26 +376,69 @@ static irqreturn_t ad7606_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
};
+static int ad7606_validate_trigger(struct iio_dev *indio_dev,
+ struct iio_trigger *trig)
+{
+ struct ad7606_state *st = iio_priv(indio_dev);
+
+ if (st->trig != trig)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int ad7606_buffer_postenable(struct iio_dev *indio_dev)
+{
+ struct ad7606_state *st = iio_priv(indio_dev);
+
+ iio_triggered_buffer_postenable(indio_dev);
+ gpiod_set_value(st->gpio_convst, 1);
+
+ return 0;
+}
+
+static int ad7606_buffer_predisable(struct iio_dev *indio_dev)
+{
+ struct ad7606_state *st = iio_priv(indio_dev);
+
+ gpiod_set_value(st->gpio_convst, 0);
+
+ return iio_triggered_buffer_predisable(indio_dev);
+}
+
+static const struct iio_buffer_setup_ops ad7606_buffer_ops = {
+ .postenable = &ad7606_buffer_postenable,
+ .predisable = &ad7606_buffer_predisable,
+};
+
static const struct iio_info ad7606_info_no_os_or_range = {
.read_raw = &ad7606_read_raw,
+ .validate_trigger = &ad7606_validate_trigger,
};
static const struct iio_info ad7606_info_os_and_range = {
.read_raw = &ad7606_read_raw,
.write_raw = &ad7606_write_raw,
.attrs = &ad7606_attribute_group_os_and_range,
+ .validate_trigger = &ad7606_validate_trigger,
};
static const struct iio_info ad7606_info_os = {
.read_raw = &ad7606_read_raw,
.write_raw = &ad7606_write_raw,
.attrs = &ad7606_attribute_group_os,
+ .validate_trigger = &ad7606_validate_trigger,
};
static const struct iio_info ad7606_info_range = {
.read_raw = &ad7606_read_raw,
.write_raw = &ad7606_write_raw,
.attrs = &ad7606_attribute_group_range,
+ .validate_trigger = &ad7606_validate_trigger,
+};
+
+static const struct iio_trigger_ops ad7606_trigger_ops = {
+ .validate_device = iio_trigger_validate_own_device,
};
static void ad7606_regulator_disable(void *data)
@@ -434,7 +470,6 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
/* tied to logic low, analog input range is +/- 5V */
st->range = 0;
st->oversampling = 1;
- INIT_WORK(&st->poll_work, &ad7606_poll_bh_to_ring);
st->reg = devm_regulator_get(dev, "avcc");
if (IS_ERR(st->reg))
@@ -479,14 +514,32 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
if (ret)
dev_warn(st->dev, "failed to RESET: no RESET GPIO specified\n");
- ret = devm_request_irq(dev, irq, ad7606_interrupt, IRQF_TRIGGER_FALLING,
- name, indio_dev);
+ st->trig = devm_iio_trigger_alloc(dev, "%s-dev%d",
+ indio_dev->name, indio_dev->id);
+ if (!st->trig)
+ return -ENOMEM;
+
+ st->trig->ops = &ad7606_trigger_ops;
+ st->trig->dev.parent = dev;
+ iio_trigger_set_drvdata(st->trig, indio_dev);
+ ret = devm_iio_trigger_register(dev, st->trig);
+ if (ret)
+ return ret;
+
+ indio_dev->trig = iio_trigger_get(st->trig);
+
+ ret = devm_request_threaded_irq(dev, irq,
+ NULL,
+ &ad7606_interrupt,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ name, indio_dev);
if (ret)
return ret;
ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
+ &iio_pollfunc_store_time,
&ad7606_trigger_handler,
- NULL, NULL);
+ &ad7606_buffer_ops);
if (ret)
return ret;
diff --git a/drivers/staging/iio/adc/ad7606.h b/drivers/staging/iio/adc/ad7606.h
index 3e12fff2f1ad2ccb9aaa122843eed0dc1af3f1e7..9a832d208acf7a8de674ba31cc96bbaab0bc51ec 100644
--- a/drivers/staging/iio/adc/ad7606.h
+++ b/drivers/staging/iio/adc/ad7606.h
@@ -26,8 +26,6 @@ struct ad7606_chip_info {
* @dev pointer to kernel device
* @chip_info entry in the table of chips that describes this device
* @reg regulator info for the the power supply of the device
- * @poll_work work struct for continuously reading data from the device
- * into an IIO triggered buffer
* @bops bus operations (SPI or parallel)
* @range voltage range selection, selects which scale to apply
* @oversampling oversampling selection
@@ -42,14 +40,13 @@ struct ad7606_chip_info {
* is being read on the first channel
* @gpio_os GPIO descriptors to control oversampling on the device
* @complete completion to indicate end of conversion
+ * @trig The IIO trigger associated with the device.
* @data buffer for reading data from the device
*/
-
struct ad7606_state {
struct device *dev;
const struct ad7606_chip_info *chip_info;
struct regulator *reg;
- struct work_struct poll_work;
const struct ad7606_bus_ops *bops;
unsigned int range;
unsigned int oversampling;
@@ -62,6 +59,7 @@ struct ad7606_state {
struct gpio_desc *gpio_standby;
struct gpio_desc *gpio_frstdata;
struct gpio_descs *gpio_os;
+ struct iio_trigger *trig;
struct completion completion;
/*