iio: accel: fxls8962af: add wake on event

This adds ways for the SoC to wake from accelerometer wake events.

In the suspend function we skip disabling the sensor if wakeup-source
and events are activated.

If buffered reads are enabled they will be deactivated before suspend.
As the onboard buffer is only holding up to 32 12-bit X/Y/Z data
triplets.

Signed-off-by: Sean Nyekjaer <sean@geanix.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20210920114221.1595543-2-sean@geanix.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/accel/fxls8962af-core.c b/drivers/iio/accel/fxls8962af-core.c
index f3d7b3a..06b490c 100644 (file)
--- a/drivers/iio/accel/fxls8962af-core.c
+++ b/drivers/iio/accel/fxls8962af-core.c
@@ -166,6 +166,7 @@ struct fxls8962af_data {
        } scan;
        int64_t timestamp, old_timestamp;       /* Only used in hw fifo mode. */
        struct iio_mount_matrix orientation;
+       int irq;
        u8 watermark;
        u8 enable_event;
        u16 lower_thres;
@@ -1156,6 +1157,7 @@ int fxls8962af_core_probe(struct device *dev, struct regmap *regmap, int irq)
        data = iio_priv(indio_dev);
        dev_set_drvdata(dev, indio_dev);
        data->regmap = regmap;
+       data->irq = irq;
 
        ret = iio_read_mount_matrix(dev, &data->orientation);
        if (ret)
@@ -1225,6 +1227,9 @@ int fxls8962af_core_probe(struct device *dev, struct regmap *regmap, int irq)
        if (ret)
                return ret;
 
+       if (device_property_read_bool(dev, "wakeup-source"))
+               device_init_wakeup(dev, true);
+
        return devm_iio_device_register(dev, indio_dev);
 }
 EXPORT_SYMBOL_GPL(fxls8962af_core_probe);
@@ -1250,9 +1255,46 @@ static int __maybe_unused fxls8962af_runtime_resume(struct device *dev)
        return fxls8962af_active(data);
 }
 
+static int __maybe_unused fxls8962af_suspend(struct device *dev)
+{
+       struct iio_dev *indio_dev = dev_get_drvdata(dev);
+       struct fxls8962af_data *data = iio_priv(indio_dev);
+
+       if (device_may_wakeup(dev) && data->enable_event) {
+               enable_irq_wake(data->irq);
+
+               /*
+                * Disable buffer, as the buffer is so small the device will wake
+                * almost immediately.
+                */
+               if (iio_buffer_enabled(indio_dev))
+                       fxls8962af_buffer_predisable(indio_dev);
+       } else {
+               fxls8962af_runtime_suspend(dev);
+       }
+
+       return 0;
+}
+
+static int __maybe_unused fxls8962af_resume(struct device *dev)
+{
+       struct iio_dev *indio_dev = dev_get_drvdata(dev);
+       struct fxls8962af_data *data = iio_priv(indio_dev);
+
+       if (device_may_wakeup(dev) && data->enable_event) {
+               disable_irq_wake(data->irq);
+
+               if (iio_buffer_enabled(indio_dev))
+                       fxls8962af_buffer_postenable(indio_dev);
+       } else {
+               fxls8962af_runtime_resume(dev);
+       }
+
+       return 0;
+}
+
 const struct dev_pm_ops fxls8962af_pm_ops = {
-       SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
-                               pm_runtime_force_resume)
+       SET_SYSTEM_SLEEP_PM_OPS(fxls8962af_suspend, fxls8962af_resume)
        SET_RUNTIME_PM_OPS(fxls8962af_runtime_suspend,
                           fxls8962af_runtime_resume, NULL)
 };