HID: add usage_index in struct hid_usage.
Currently, there is no way to know the index of the current field
in the .input_mapping and .event callbacks when this field is inside
an array of HID fields.
This patch adds this index to the struct hid_usage so that this
information is available to input_mapping and event callbacks.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index f5004e2..b5974cd 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -92,6 +92,7 @@
static struct hid_field *hid_register_field(struct hid_report *report, unsigned usages, unsigned values)
{
struct hid_field *field;
+ int i;
if (report->maxfield == HID_MAX_FIELDS) {
hid_err(report->device, "too many fields in report\n");
@@ -110,6 +111,9 @@
field->value = (s32 *)(field->usage + usages);
field->report = report;
+ for (i = 0; i < usages; i++)
+ field->usage[i].usage_index = i;
+
return field;
}
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 4161bf2..d2c42dd 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -342,6 +342,7 @@
struct hid_usage {
unsigned hid; /* hid usage code */
unsigned collection_index; /* index into collection array */
+ unsigned usage_index; /* index into usage array */
/* hidinput data */
__u16 code; /* input driver code */
__u8 type; /* input driver type */