diff mbox series

[v2,08/12] HID: core: for input reports, process the usages by priority list

Message ID 20220203143226.4023622-9-benjamin.tissoires@redhat.com
State Accepted
Commit bebcc522fbee4bf51a2571378154ef2a4bf14724
Headers show
Series HID: fix for generic input processing | expand

Commit Message

Benjamin Tissoires Feb. 3, 2022, 2:32 p.m. UTC
Now that we have a list of fields/usages by priority order,
walk through that list to process the inputs instead of using the
order provided by the manufacturer.

Note that this changes the way we update the values in the struct
hid_field:
Previously, once a field was processed, we updated the new values.
Now we need to wait for the entire report to be processed to update
the values.

I don't think it will be an issue: because we were relying on the device
ordering, there were no guarantees to have a field stored before an other.
Which is why we introduced .report() in drivers to have those values
updated.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
---
 drivers/hid/hid-core.c | 45 +++++++++++++++++++++++++++++++++++-------
 1 file changed, 38 insertions(+), 7 deletions(-)
diff mbox series

Patch

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index b38528118642..db925794fbe6 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1657,17 +1657,48 @@  static void hid_process_report(struct hid_device *hid,
 			       int interrupt)
 {
 	unsigned int a;
+	struct hid_field_entry *entry;
 	struct hid_field *field;
 
-	for (a = 0; a < report->maxfield; a++) {
-		field = report->field[a];
+	/* first retrieve all incoming values in data */
+	for (a = 0; a < report->maxfield; a++)
+		hid_input_fetch_field(hid, field = report->field[a], data);
+
+	if (!list_empty(&report->field_entry_list)) {
+		/* INPUT_REPORT, we have a priority list of fields */
+		list_for_each_entry(entry,
+				    &report->field_entry_list,
+				    list) {
+			field = entry->field;
+
+			if (field->flags & HID_MAIN_ITEM_VARIABLE)
+				hid_process_event(hid,
+						  field,
+						  &field->usage[entry->index],
+						  field->new_value[entry->index],
+						  interrupt);
+			else
+				hid_input_array_field(hid, field, interrupt);
+		}
 
-		hid_input_fetch_field(hid, field, data);
+		/* we need to do the memcpy at the end for var items */
+		for (a = 0; a < report->maxfield; a++) {
+			field = report->field[a];
 
-		if (field->flags & HID_MAIN_ITEM_VARIABLE)
-			hid_input_var_field(hid, field, interrupt);
-		else
-			hid_input_array_field(hid, field, interrupt);
+			if (field->flags & HID_MAIN_ITEM_VARIABLE)
+				memcpy(field->value, field->new_value,
+				       field->report_count * sizeof(__s32));
+		}
+	} else {
+		/* FEATURE_REPORT, regular processing */
+		for (a = 0; a < report->maxfield; a++) {
+			field = report->field[a];
+
+			if (field->flags & HID_MAIN_ITEM_VARIABLE)
+				hid_input_var_field(hid, field, interrupt);
+			else
+				hid_input_array_field(hid, field, interrupt);
+		}
 	}
 }