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HID: core: factor out hid_set_group()

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When we load a bpf, we can change the report descriptor. However, the
current implementation doesn't change the group meaning that we can not
rebind a device from hid-generic to hid-multitouch.

This is a preparatory patch to force a rescan of the device after the
bpf has been loaded.

Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
This commit is contained in:
Benjamin Tissoires 2025-08-21 16:38:13 +02:00 committed by Jiri Kosina
parent 02d6eeedbc
commit 4e411a3f7b
1 changed files with 15 additions and 8 deletions
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23
drivers/hid/hid-core.c
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@ -2708,6 +2708,20 @@ static bool hid_check_device_match(struct hid_device *hdev,
return !hid_ignore_special_drivers && !(hdev->quirks & HID_QUIRK_IGNORE_SPECIAL_DRIVER);
}
static void hid_set_group(struct hid_device *hdev)
{
int ret;
if (hid_ignore_special_drivers) {
hdev->group = HID_GROUP_GENERIC;
} else if (!hdev->group &&
!(hdev->quirks & HID_QUIRK_HAVE_SPECIAL_DRIVER)) {
ret = hid_scan_report(hdev);
if (ret)
hid_warn(hdev, "bad device descriptor (%d)\n", ret);
}
}
static int __hid_device_probe(struct hid_device *hdev, struct hid_driver *hdrv)
{
const struct hid_device_id *id;
@ -2903,14 +2917,7 @@ int hid_add_device(struct hid_device *hdev)
/*
* Scan generic devices for group information
*/
if (hid_ignore_special_drivers) {
hdev->group = HID_GROUP_GENERIC;
} else if (!hdev->group &&
!(hdev->quirks & HID_QUIRK_HAVE_SPECIAL_DRIVER)) {
ret = hid_scan_report(hdev);
if (ret)
hid_warn(hdev, "bad device descriptor (%d)\n", ret);
}
hid_set_group(hdev);
hdev->id = atomic_inc_return(&id);