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HID: core: for input reports, process the usages by priority list

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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>
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>
This commit is contained in:
Benjamin Tissoires 2022-02-03 15:32:22 +01:00 committed by Jiri Kosina
parent 22f4b026c3
commit bebcc522fb
1 changed files with 38 additions and 7 deletions
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33
drivers/hid/hid-core.c
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@ -1657,18 +1657,49 @@ static void hid_process_report(struct hid_device *hid,
int interrupt)
{
unsigned int a;
struct hid_field_entry *entry;
struct hid_field *field;
/* 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);
}
/* we need to do the memcpy at the end for var items */
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)
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);
}
}
}
/*