1 files changed, 45 insertions, 10 deletions

diff --git a/include/linux/hid-sensor-hub.h b/include/linux/hid-sensor-hub.h
index 4173a8fdad9e..0408421d885f 100644
--- a/include/linux/hid-sensor-hub.h
+++ b/include/linux/hid-sensor-hub.h
@@ -49,19 +49,43 @@ struct hid_sensor_hub_attribute_info {
 };
 
 /**
+ * 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;
 };
 
 /**
@@ -152,40 +176,51 @@ int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
 * @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:      Synchronous 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.
 * @report_id:   Report id to look for
 * @field_index: Field index inside a report
-* @value:       Value to set
+* @buffer_size: size of the buffer
+* @buffer:      buffer to use in the feature set
 *
 * Used to set a field in feature report. For example this can set polling
 * interval, sensitivity, activate/deactivate state.
 */
 int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
-                        u32 field_index, s32 value);
+                           u32 field_index, int buffer_size, void *buffer);
 
 /**
 * sensor_hub_get_feature() - Feature get request
 * @hsdev:       Hub device instance.
 * @report_id:   Report id to look for
 * @field_index: Field index inside a report
-* @value:       Place holder for return value
+* @buffer_size: size of the buffer
+* @buffer:      buffer to copy output
 *
 * Used to get a field in feature report. For example this can get polling
-* interval, sensitivity, activate/deactivate state.
+* interval, sensitivity, activate/deactivate state. On success it returns
+* number of bytes copied to buffer. On failure, it returns value < 0.
 */
 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
-                        u32 field_index, s32 *value);
+                           u32 field_index, int buffer_size, void *buffer);
 
 /* hid-sensor-attributes */