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HID: add usage_index in struct hid_usage.

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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>
This commit is contained in:
Benjamin Tissoires 2012-11-14 16:59:16 +01:00 committed by Jiri Kosina
parent 7746383868
commit f262d1fa2c
2 changed files with 5 additions and 0 deletions
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4
drivers/hid/hid-core.c
View File

@ -92,6 +92,7 @@ EXPORT_SYMBOL_GPL(hid_register_report);
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 @@ static struct hid_field *hid_register_field(struct hid_report *report, unsigned
field->value = (s32 *)(field->usage + usages);
field->report = report;
for (i = 0; i < usages; i++)
field->usage[i].usage_index = i;
return field;
}

1
include/linux/hid.h
View File

@ -342,6 +342,7 @@ struct hid_collection {
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 */