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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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4
drivers/hid/hid-core.c
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@@ -2739,10 +2739,12 @@ int hid_add_device(struct hid_device *hdev)
hid_warn(hdev, "bad device descriptor (%d)\n", ret); hid_warn(hdev, "bad device descriptor (%d)\n", ret);
} }
hdev->id = atomic_inc_return(&id);
/* XXX hack, any other cleaner solution after the driver core /* XXX hack, any other cleaner solution after the driver core
* is converted to allow more than 20 bytes as the device name? */ * is converted to allow more than 20 bytes as the device name? */
dev_set_name(&hdev->dev, "%04X:%04X:%04X.%04X", hdev->bus, dev_set_name(&hdev->dev, "%04X:%04X:%04X.%04X", hdev->bus,
hdev->vendor, hdev->product, atomic_inc_return(&id)); hdev->vendor, hdev->product, hdev->id);
hid_debug_register(hdev, dev_name(&hdev->dev)); hid_debug_register(hdev, dev_name(&hdev->dev));
ret = device_add(&hdev->dev); ret = device_add(&hdev->dev);

2
include/linux/hid.h
View File

@@ -658,6 +658,8 @@ struct hid_device { /* device report descriptor */
struct list_head debug_list; struct list_head debug_list;
spinlock_t debug_list_lock; spinlock_t debug_list_lock;
wait_queue_head_t debug_wait; wait_queue_head_t debug_wait;
unsigned int id; /* system unique id */
}; };
#define to_hid_device(pdev) \ #define to_hid_device(pdev) \