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115afb20fd
[ Upstream commit 645c224ac5 ]
We already have the possibility to force not binding to hid-generic and
rely on a dedicated driver, but we couldn't do the other way around.
This is useful for BPF programs where we are fixing the report descriptor
and the events, but want to avoid a specialized driver to come after BPF
which would unwind everything that is done there.
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Link: https://patch.msgid.link/20241001-hid-bpf-hid-generic-v3-8-2ef1019468df@kernel.org
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
90 lines
1.9 KiB
C
90 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* HID support for Linux
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*
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* Copyright (c) 1999 Andreas Gal
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* Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
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* Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
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* Copyright (c) 2007-2008 Oliver Neukum
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* Copyright (c) 2006-2012 Jiri Kosina
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* Copyright (c) 2012 Henrik Rydberg
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*/
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/*
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <asm/unaligned.h>
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#include <asm/byteorder.h>
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#include <linux/hid.h>
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static struct hid_driver hid_generic;
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static int __check_hid_generic(struct device_driver *drv, void *data)
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{
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struct hid_driver *hdrv = to_hid_driver(drv);
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struct hid_device *hdev = data;
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if (hdrv == &hid_generic)
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return 0;
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return hid_match_device(hdev, hdrv) != NULL;
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}
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static bool hid_generic_match(struct hid_device *hdev,
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bool ignore_special_driver)
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{
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if (ignore_special_driver)
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return true;
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if (hdev->quirks & HID_QUIRK_IGNORE_SPECIAL_DRIVER)
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return true;
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if (hdev->quirks & HID_QUIRK_HAVE_SPECIAL_DRIVER)
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return false;
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/*
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* If any other driver wants the device, leave the device to this other
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* driver.
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*/
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if (bus_for_each_drv(&hid_bus_type, NULL, hdev, __check_hid_generic))
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return false;
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return true;
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}
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static int hid_generic_probe(struct hid_device *hdev,
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const struct hid_device_id *id)
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{
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int ret;
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hdev->quirks |= HID_QUIRK_INPUT_PER_APP;
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ret = hid_parse(hdev);
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if (ret)
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return ret;
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return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
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}
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static const struct hid_device_id hid_table[] = {
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{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY, HID_ANY_ID, HID_ANY_ID) },
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{ }
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};
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MODULE_DEVICE_TABLE(hid, hid_table);
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static struct hid_driver hid_generic = {
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.name = "hid-generic",
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.id_table = hid_table,
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.match = hid_generic_match,
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.probe = hid_generic_probe,
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};
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module_hid_driver(hid_generic);
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MODULE_AUTHOR("Henrik Rydberg");
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MODULE_DESCRIPTION("HID generic driver");
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MODULE_LICENSE("GPL");
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