GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-07-05 22:12:16 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

HID: hid-sensor-hub: Allow parallel synchronous reads

Browse source 
Current implementation only allows one outstanding synchronous read.
This is a performance hit when user mode is requesting raw reads
of sensor attributes on multiple sensors together.
This change changes the mutex lock to per hid sensor hub device instead
of global lock. Although request to hid sensor hub is serialized, there
can be multiple outstanding read requests pending for responses via
hid reports.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Srinivas Pandruvada 2015-02-19 15:31:25 -08:00 • committed by Jiri Kosina
parent 870fd0f5df
commit e651a1da44
2 changed files with 65 additions and 49 deletions
Download patch file Download diff file Expand all files Collapse all files

24
include/linux/hid-sensor-hub.h
View file

@ -46,20 +46,44 @@ struct hid_sensor_hub_attribute_info {
s32 logical_maximum;
};
/**
* struct sensor_hub_pending - Synchronous read pending information
* @status: Pending status true/false.
* @ready: Completion synchronization data.
* @usage_id: Usage id for physical device, E.g. Gyro usage id.
* @attr_usage_id: Usage Id of a field, E.g. X-AXIS for a gyro.
* @raw_size: Response size for a read request.
* @raw_data: Place holder for received response.
*/
struct sensor_hub_pending {
bool status;
struct completion ready;
u32 usage_id;
u32 attr_usage_id;
int raw_size;
u8 *raw_data;
};
/**
* struct hid_sensor_hub_device - Stores the hub instance data
* @hdev: Stores the hid instance.
* @vendor_id: Vendor id of hub device.
* @product_id: Product id of hub device.
* @usage: Usage id for this hub device instance.
* @start_collection_index: Starting index for a phy type collection
* @end_collection_index: Last index for a phy type collection
* @mutex: synchronizing mutex.
* @pending: Holds information of pending sync read request.
*/
struct hid_sensor_hub_device {
struct hid_device *hdev;
u32 vendor_id;
u32 product_id;
u32 usage;
int start_collection_index;
int end_collection_index;
struct mutex mutex;
struct sensor_hub_pending pending;
};
/**