HID: hid-sensor-hub: fix report size

Most of the hid sensor field size is reported in report_size field
in the report descriptor. For rotation fusion sensor the quaternion
data is 16 byte field, the report size was set to 4 and report
count field is set to 4. So the total size is 16 bytes. But the current
driver has a bug and not taking account for report count field. This
causes user space to see only 4 bytes of data sent via IIO interface.
The number of bytes in a field needs to take account of report_count
field. Need to multiply report_size and report_count to get total
number of bytes.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 8 insertions, 5 deletions

diff --git a/drivers/hid/hid-sensor-hub.c b/drivers/hid/hid-sensor-hub.c
index 10e1581022cf..9e4cdca549c0 100644
--- a/drivers/hid/hid-sensor-hub.c
+++ b/drivers/hid/hid-sensor-hub.c
@@ -326,7 +326,8 @@ int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
                                 field->logical == attr_usage_id) {
                                 sensor_hub_fill_attr_info(info, i, report->id,
                                         field->unit, field->unit_exponent,
-                                        field->report_size);
+                                        field->report_size *
+                                                        field->report_count);
                                 ret = 0;
                         } else {
                                 for (j = 0; j < field->maxusage; ++j) {
@@ -338,7 +339,8 @@ int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
                                                         i, report->id,
                                                         field->unit,
                                                         field->unit_exponent,
-                                                        field->report_size);
+                                                        field->report_size *
+                                                        field->report_count);
                                                 ret = 0;
                                                 break;
                                         }
@@ -425,9 +427,10 @@ static int sensor_hub_raw_event(struct hid_device *hdev,
                 hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
                                 i, report->field[i]->usage->collection_index,
                                 report->field[i]->usage->hid,
-                                report->field[i]->report_size/8);
-
-                sz = report->field[i]->report_size/8;
+                                (report->field[i]->report_size *
+                                        report->field[i]->report_count)/8);
+                sz = (report->field[i]->report_size *
+                                        report->field[i]->report_count)/8;
                 if (pdata->pending.status && pdata->pending.attr_usage_id ==
                                 report->field[i]->usage->hid) {
                         hid_dbg(hdev, "data was pending ...\n");