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Subject[PATCH v7 12/12] iio: cros_ec: flush as hwfifo attribute
Date
Add buffer/hwfifo_flush. It is not part of the ABI, but it follows ST
and HID lead: Tells the sensor hub to send to the host all pending
sensor events.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
---
No changes in v7.
New in v6.

.../cros_ec_sensors/cros_ec_sensors_core.c | 28 +++++++++++++++++++
1 file changed, 28 insertions(+)

diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
index c831915ca7e56..aaf124a82e0e4 100644
--- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
+++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
@@ -113,6 +113,33 @@ static int cros_ec_sensor_set_ec_rate(struct cros_ec_sensors_core_state *st,
return ret;
}

+static ssize_t cros_ec_sensors_flush(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
+ int ret = 0;
+ bool flush;
+
+ ret = strtobool(buf, &flush);
+ if (ret < 0)
+ return ret;
+ if (!flush)
+ return -EINVAL;
+
+ mutex_lock(&st->cmd_lock);
+ st->param.cmd = MOTIONSENSE_CMD_FIFO_FLUSH;
+ ret = cros_ec_motion_send_host_cmd(st, 0);
+ if (ret != 0)
+ dev_warn(&indio_dev->dev, "Unable to flush sensor\n");
+ mutex_unlock(&st->cmd_lock);
+ return ret ? ret : len;
+}
+
+static IIO_DEVICE_ATTR(hwfifo_flush, 0644, NULL,
+ cros_ec_sensors_flush, 0);
+
static ssize_t cros_ec_sensor_set_report_latency(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
@@ -175,6 +202,7 @@ static ssize_t hwfifo_watermark_max_show(struct device *dev,
static IIO_DEVICE_ATTR_RO(hwfifo_watermark_max, 0);

const struct attribute *cros_ec_sensor_fifo_attributes[] = {
+ &iio_dev_attr_hwfifo_flush.dev_attr.attr,
&iio_dev_attr_hwfifo_timeout.dev_attr.attr,
&iio_dev_attr_hwfifo_watermark_max.dev_attr.attr,
NULL,
--
2.26.0.rc2.310.g2932bb562d-goog
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