HID: core: split data fetching from processing in hid_input_field()
This is a preparatory patch for being able to process the usages
out of order. We split the retrieval of the data in a separate function
and also split out the processing of the usages depending if the field
is an array or a variable.
No functional changes from this patch.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: Ping Cheng <ping.cheng@wacom.com>
Acked-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index fad4dbd..34188d7 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1544,13 +1544,12 @@ static inline int hid_array_value_is_valid(struct hid_field *field,
}
/*
- * Analyse a received field, and fetch the data from it. The field
- * content is stored for next report processing (we do differential
- * reporting to the layer).
+ * Fetch the field from the data. The field content is stored for next
+ * report processing (we do differential reporting to the layer).
*/
-
-static void hid_input_field(struct hid_device *hid, struct hid_field *field,
- __u8 *data, int interrupt)
+static void hid_input_fetch_field(struct hid_device *hid,
+ struct hid_field *field,
+ __u8 *data)
{
unsigned n;
unsigned count = field->report_count;
@@ -1561,6 +1560,7 @@ static void hid_input_field(struct hid_device *hid, struct hid_field *field,
value = field->new_value;
memset(value, 0, count * sizeof(__s32));
+ field->ignored = false;
for (n = 0; n < count; n++) {
@@ -1572,21 +1572,56 @@ static void hid_input_field(struct hid_device *hid, struct hid_field *field,
/* Ignore report if ErrorRollOver */
if (!(field->flags & HID_MAIN_ITEM_VARIABLE) &&
hid_array_value_is_valid(field, value[n]) &&
- field->usage[value[n] - min].hid == HID_UP_KEYBOARD + 1)
+ field->usage[value[n] - min].hid == HID_UP_KEYBOARD + 1) {
+ field->ignored = true;
return;
+ }
}
+}
+
+/*
+ * Process a received variable field.
+ */
+
+static void hid_input_var_field(struct hid_device *hid,
+ struct hid_field *field,
+ int interrupt)
+{
+ unsigned int count = field->report_count;
+ __s32 *value = field->new_value;
+ unsigned int n;
+
+ for (n = 0; n < count; n++)
+ hid_process_event(hid,
+ field,
+ &field->usage[n],
+ value[n],
+ interrupt);
+
+ memcpy(field->value, value, count * sizeof(__s32));
+}
+
+/*
+ * Process a received array field. The field content is stored for
+ * next report processing (we do differential reporting to the layer).
+ */
+
+static void hid_input_array_field(struct hid_device *hid,
+ struct hid_field *field,
+ int interrupt)
+{
+ unsigned int n;
+ unsigned int count = field->report_count;
+ __s32 min = field->logical_minimum;
+ __s32 *value;
+
+ value = field->new_value;
+
+ /* ErrorRollOver */
+ if (field->ignored)
+ return;
for (n = 0; n < count; n++) {
-
- if (HID_MAIN_ITEM_VARIABLE & field->flags) {
- hid_process_event(hid,
- field,
- &field->usage[n],
- value[n],
- interrupt);
- continue;
- }
-
if (hid_array_value_is_valid(field, field->value[n]) &&
search(value, field->value[n], count))
hid_process_event(hid,
@@ -1608,6 +1643,31 @@ static void hid_input_field(struct hid_device *hid, struct hid_field *field,
}
/*
+ * Analyse a received report, and fetch the data from it. The field
+ * content is stored for next report processing (we do differential
+ * reporting to the layer).
+ */
+static void hid_process_report(struct hid_device *hid,
+ struct hid_report *report,
+ __u8 *data,
+ int interrupt)
+{
+ unsigned int a;
+ struct hid_field *field;
+
+ for (a = 0; a < report->maxfield; a++) {
+ field = report->field[a];
+
+ hid_input_fetch_field(hid, field, data);
+
+ if (field->flags & HID_MAIN_ITEM_VARIABLE)
+ hid_input_var_field(hid, field, interrupt);
+ else
+ hid_input_array_field(hid, field, interrupt);
+ }
+}
+
+/*
* Output the field into the report.
*/
@@ -1768,7 +1828,6 @@ int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, u32 size,
struct hid_report_enum *report_enum = hid->report_enum + type;
struct hid_report *report;
struct hid_driver *hdrv;
- unsigned int a;
u32 rsize, csize = size;
u8 *cdata = data;
int ret = 0;
@@ -1804,8 +1863,7 @@ int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, u32 size,
}
if (hid->claimed != HID_CLAIMED_HIDRAW && report->maxfield) {
- for (a = 0; a < report->maxfield; a++)
- hid_input_field(hid, report->field[a], cdata, interrupt);
+ hid_process_report(hid, report, cdata, interrupt);
hdrv = hid->driver;
if (hdrv && hdrv->report)
hdrv->report(hid, report);
