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path: root/drivers/iio/common/st_sensors/st_sensors_trigger.c
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Diffstat (limited to 'drivers/iio/common/st_sensors/st_sensors_trigger.c')
-rw-r--r--drivers/iio/common/st_sensors/st_sensors_trigger.c96
1 files changed, 89 insertions, 7 deletions
diff --git a/drivers/iio/common/st_sensors/st_sensors_trigger.c b/drivers/iio/common/st_sensors/st_sensors_trigger.c
index da72279fcf99..296e4ff19ae8 100644
--- a/drivers/iio/common/st_sensors/st_sensors_trigger.c
+++ b/drivers/iio/common/st_sensors/st_sensors_trigger.c
@@ -17,6 +17,73 @@
#include <linux/iio/common/st_sensors.h>
#include "st_sensors_core.h"
+/**
+ * st_sensors_irq_handler() - top half of the IRQ-based triggers
+ * @irq: irq number
+ * @p: private handler data
+ */
+irqreturn_t st_sensors_irq_handler(int irq, void *p)
+{
+ struct iio_trigger *trig = p;
+ struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ /* Get the time stamp as close in time as possible */
+ sdata->hw_timestamp = iio_get_time_ns();
+ return IRQ_WAKE_THREAD;
+}
+
+/**
+ * st_sensors_irq_thread() - bottom half of the IRQ-based triggers
+ * @irq: irq number
+ * @p: private handler data
+ */
+irqreturn_t st_sensors_irq_thread(int irq, void *p)
+{
+ struct iio_trigger *trig = p;
+ struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+ int ret;
+
+ /*
+ * If this trigger is backed by a hardware interrupt and we have a
+ * status register, check if this IRQ came from us
+ */
+ if (sdata->sensor_settings->drdy_irq.addr_stat_drdy) {
+ u8 status;
+
+ ret = sdata->tf->read_byte(&sdata->tb, sdata->dev,
+ sdata->sensor_settings->drdy_irq.addr_stat_drdy,
+ &status);
+ if (ret < 0) {
+ dev_err(sdata->dev, "could not read channel status\n");
+ goto out_poll;
+ }
+ /*
+ * the lower bits of .active_scan_mask[0] is directly mapped
+ * to the channels on the sensor: either bit 0 for
+ * one-dimensional sensors, or e.g. x,y,z for accelerometers,
+ * gyroscopes or magnetometers. No sensor use more than 3
+ * channels, so cut the other status bits here.
+ */
+ status &= 0x07;
+
+ /*
+ * If this was not caused by any channels on this sensor,
+ * return IRQ_NONE
+ */
+ if (!indio_dev->active_scan_mask)
+ return IRQ_NONE;
+ if (!(status & (u8)indio_dev->active_scan_mask[0]))
+ return IRQ_NONE;
+ }
+
+out_poll:
+ /* It's our IRQ: proceed to handle the register polling */
+ iio_trigger_poll_chained(p);
+ return IRQ_HANDLED;
+}
+
int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
const struct iio_trigger_ops *trigger_ops)
{
@@ -30,6 +97,10 @@ int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
return -ENOMEM;
}
+ iio_trigger_set_drvdata(sdata->trig, indio_dev);
+ sdata->trig->ops = trigger_ops;
+ sdata->trig->dev.parent = sdata->dev;
+
irq = sdata->get_irq_data_ready(indio_dev);
irq_trig = irqd_get_trigger_type(irq_get_irq_data(irq));
/*
@@ -77,9 +148,12 @@ int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
sdata->sensor_settings->drdy_irq.addr_stat_drdy)
irq_trig |= IRQF_SHARED;
- err = request_threaded_irq(irq,
- iio_trigger_generic_data_rdy_poll,
- NULL,
+ /* Let's create an interrupt thread masking the hard IRQ here */
+ irq_trig |= IRQF_ONESHOT;
+
+ err = request_threaded_irq(sdata->get_irq_data_ready(indio_dev),
+ st_sensors_irq_handler,
+ st_sensors_irq_thread,
irq_trig,
sdata->trig->name,
sdata->trig);
@@ -88,10 +162,6 @@ int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
goto iio_trigger_free;
}
- iio_trigger_set_drvdata(sdata->trig, indio_dev);
- sdata->trig->ops = trigger_ops;
- sdata->trig->dev.parent = sdata->dev;
-
err = iio_trigger_register(sdata->trig);
if (err < 0) {
dev_err(&indio_dev->dev, "failed to register iio trigger.\n");
@@ -119,6 +189,18 @@ void st_sensors_deallocate_trigger(struct iio_dev *indio_dev)
}
EXPORT_SYMBOL(st_sensors_deallocate_trigger);
+int st_sensors_validate_device(struct iio_trigger *trig,
+ struct iio_dev *indio_dev)
+{
+ struct iio_dev *indio = iio_trigger_get_drvdata(trig);
+
+ if (indio != indio_dev)
+ return -EINVAL;
+
+ return 0;
+}
+EXPORT_SYMBOL(st_sensors_validate_device);
+
MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
MODULE_DESCRIPTION("STMicroelectronics ST-sensors trigger");
MODULE_LICENSE("GPL v2");