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HID: core: store the unique system identifier in hid_device

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This unique identifier is currently used only for ensuring uniqueness in
sysfs. However, this could be handful for userspace to refer to a specific
hid_device by this id.

2 use cases are in my mind: LEDs (and their naming convention), and
HID-BPF.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20220902132938.2409206-9-benjamin.tissoires@redhat.com
This commit is contained in:
Benjamin Tissoires
2022-09-02 15:29:23 +02:00
parent eeeec27d68
commit 1e839143d6
2 changed files with 5 additions and 1 deletions
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2
include/linux/hid.h
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@@ -658,6 +658,8 @@ struct hid_device { /* device report descriptor */
struct list_head debug_list;
spinlock_t debug_list_lock;
wait_queue_head_t debug_wait;
unsigned int id; /* system unique id */
};
#define to_hid_device(pdev) \