[PATCH 1/9] HID: hid-sensor-hub: Extend API for async reads
From: Srinivas Pandruvada <hidden>
Date: 2015-01-07 18:47:55
Also in:
linux-iio
Subsystem:
hid core layer, hid sensor hub drivers, the rest · Maintainers:
Jiri Kosina, Benjamin Tissoires, Jonathan Cameron, Srinivas Pandruvada, Linus Torvalds
Possibly related (same subject, not in this thread)
- 2015-01-10 · Re: [PATCH 1/9] HID: hid-sensor-hub: Extend API for async reads · Jonathan Cameron <hidden>
- 2015-01-07 · [PATCH 1/9] HID: hid-sensor-hub: Extend API for async reads · Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Add additional flag to read in async mode. In this mode the caller need to register for events and match attribute usage id for result. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada-VuQAYsv1563Yd54FQh9/CA@public.gmane.org> --- drivers/hid/hid-sensor-hub.c | 15 ++++++++++++++- include/linux/hid-sensor-hub.h | 19 +++++++++++++------ 2 files changed, 27 insertions(+), 7 deletions(-)
diff --git a/drivers/hid/hid-sensor-hub.c b/drivers/hid/hid-sensor-hub.c
index 8bed109..7403b25 100644
--- a/drivers/hid/hid-sensor-hub.c
+++ b/drivers/hid/hid-sensor-hub.c@@ -275,13 +275,26 @@ EXPORT_SYMBOL_GPL(sensor_hub_get_feature); int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev, u32 usage_id, - u32 attr_usage_id, u32 report_id) + u32 attr_usage_id, u32 report_id, + enum sensor_hub_read_flags flag) { struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev); unsigned long flags; struct hid_report *report; int ret_val = 0; + if (flag == SENSOR_HUB_ASYNC) { + report = sensor_hub_report(report_id, hsdev->hdev, + HID_INPUT_REPORT); + if (!report) + return -EINVAL; + + mutex_lock(&data->mutex); + hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT); + mutex_unlock(&data->mutex); + return 0; + } + mutex_lock(&hsdev->mutex); memset(&hsdev->pending, 0, sizeof(hsdev->pending)); init_completion(&hsdev->pending.ready);
diff --git a/include/linux/hid-sensor-hub.h b/include/linux/hid-sensor-hub.h
index a51c768..d48e91f 100644
--- a/include/linux/hid-sensor-hub.h
+++ b/include/linux/hid-sensor-hub.h@@ -171,20 +171,27 @@ int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev, struct hid_sensor_hub_attribute_info *info); /** -* sensor_hub_input_attr_get_raw_value() - Synchronous read request +* sensor_hub_input_attr_get_raw_value() - Attribute read request * @hsdev: Hub device instance. * @usage_id: Attribute usage id of parent physical device as per spec * @attr_usage_id: Attribute usage id as per spec * @report_id: Report id to look for +* @flag: Synchronour or asynchronous read * -* Issues a synchronous read request for an input attribute. Returns -* data upto 32 bits. Since client can get events, so this call should -* not be used for data paths, this will impact performance. +* Issues a synchronous or asynchronous read request for an input attribute. +* Returns data upto 32 bits. */ +enum sensor_hub_read_flags { + SENSOR_HUB_SYNC, + SENSOR_HUB_ASYNC, +}; + int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev, - u32 usage_id, - u32 attr_usage_id, u32 report_id); + u32 usage_id, + u32 attr_usage_id, u32 report_id, + enum sensor_hub_read_flags flag +); /** * sensor_hub_set_feature() - Feature set request * @hsdev: Hub device instance.
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1.9.3