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HID: core: store the collections as a basic tree

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For each collection parsed, store a pointer to the parent collection
(if any). This makes it a lot easier to look up which collection(s)
any given item is part of

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Verified-by: Harry Cutts <hcutts@chromium.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
This commit is contained in:
Peter Hutterer 2018-12-05 10:42:22 +10:00 • committed by Benjamin Tissoires
parent 52ea899637
commit c53431eb69
2 changed files with 6 additions and 0 deletions
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4
drivers/hid/hid-core.c
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@ -172,6 +172,8 @@ static int open_collection(struct hid_parser *parser, unsigned type)
collection->type = type; collection->type = type;
collection->usage = usage; collection->usage = usage;
collection->level = parser->collection_stack_ptr - 1; collection->level = parser->collection_stack_ptr - 1;
collection->parent = parser->active_collection;
parser->active_collection = collection;
if (type == HID_COLLECTION_APPLICATION) if (type == HID_COLLECTION_APPLICATION)
parser->device->maxapplication++; parser->device->maxapplication++;
@ -190,6 +192,8 @@ static int close_collection(struct hid_parser *parser)
return -EINVAL; return -EINVAL;
} }
parser->collection_stack_ptr--; parser->collection_stack_ptr--;
if (parser->active_collection)
parser->active_collection = parser->active_collection->parent;
return 0; return 0;
} }

2
include/linux/hid.h
View file

@ -427,6 +427,7 @@ struct hid_local {
*/ */
struct hid_collection { struct hid_collection {
struct hid_collection *parent;
unsigned type; unsigned type;
unsigned usage; unsigned usage;
unsigned level; unsigned level;
@ -650,6 +651,7 @@ struct hid_parser {
unsigned int *collection_stack; unsigned int *collection_stack;
unsigned int collection_stack_ptr; unsigned int collection_stack_ptr;
unsigned int collection_stack_size; unsigned int collection_stack_size;
struct hid_collection *active_collection;
struct hid_device *device; struct hid_device *device;
unsigned int scan_flags; unsigned int scan_flags;
}; };