mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 15:27:36 +07:00
e04a0442d3
Most HID devices behave properly when they are used with hid-generic. Since kernel v4.12, we do not poll for input reports at plug in, so hid-generic should behave properly with all HID devices. There has been a long standing list of HID devices that have a special driver. It used to be just a few, but with time, this list went too big, and we can not ask users to know which HID special driver will pick up their device. We can teach hid-generic to be nice with others. If a device is not explicitly marked with HID_QUIRK_HAVE_SPECIAL_DRIVER, we can allow hid-generic to pick up the device as long as no other loaded HID driver will match the device. When the special driver appears, hid-generic can step back and let the special driver handling the device. In case this special driver is removed, this good old pal of hid-generic will rebind to the device. This basically makes the list hid_have_special_driver[] useless. It still allows to not see a hid-generic driver bound and removed during boot, so we can keep it around. This will also help other people to have a special HID driver without the need of recompiling hid-core. Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
/*
|
|
* HID support for Linux
|
|
*
|
|
* Copyright (c) 1999 Andreas Gal
|
|
* Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
|
|
* Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
|
|
* Copyright (c) 2007-2008 Oliver Neukum
|
|
* Copyright (c) 2006-2012 Jiri Kosina
|
|
* Copyright (c) 2012 Henrik Rydberg
|
|
*/
|
|
|
|
/*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the Free
|
|
* Software Foundation; either version 2 of the License, or (at your option)
|
|
* any later version.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/kernel.h>
|
|
#include <asm/unaligned.h>
|
|
#include <asm/byteorder.h>
|
|
|
|
#include <linux/hid.h>
|
|
|
|
static struct hid_driver hid_generic;
|
|
|
|
static int __unmap_hid_generic(struct device *dev, void *data)
|
|
{
|
|
struct hid_driver *hdrv = data;
|
|
struct hid_device *hdev = to_hid_device(dev);
|
|
|
|
/* only unbind matching devices already bound to hid-generic */
|
|
if (hdev->driver != &hid_generic ||
|
|
hid_match_device(hdev, hdrv) == NULL)
|
|
return 0;
|
|
|
|
if (dev->parent) /* Needed for USB */
|
|
device_lock(dev->parent);
|
|
device_release_driver(dev);
|
|
if (dev->parent)
|
|
device_unlock(dev->parent);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void hid_generic_add_driver(struct hid_driver *hdrv)
|
|
{
|
|
bus_for_each_dev(&hid_bus_type, NULL, hdrv, __unmap_hid_generic);
|
|
}
|
|
|
|
static void hid_generic_removed_driver(struct hid_driver *hdrv)
|
|
{
|
|
int ret;
|
|
|
|
ret = driver_attach(&hid_generic.driver);
|
|
}
|
|
|
|
static int __check_hid_generic(struct device_driver *drv, void *data)
|
|
{
|
|
struct hid_driver *hdrv = to_hid_driver(drv);
|
|
struct hid_device *hdev = data;
|
|
|
|
if (hdrv == &hid_generic)
|
|
return 0;
|
|
|
|
return hid_match_device(hdev, hdrv) != NULL;
|
|
}
|
|
|
|
static bool hid_generic_match(struct hid_device *hdev,
|
|
bool ignore_special_driver)
|
|
{
|
|
if (ignore_special_driver)
|
|
return true;
|
|
|
|
if (hdev->quirks & HID_QUIRK_HAVE_SPECIAL_DRIVER)
|
|
return false;
|
|
|
|
/*
|
|
* If any other driver wants the device, leave the device to this other
|
|
* driver.
|
|
*/
|
|
if (bus_for_each_drv(&hid_bus_type, NULL, hdev, __check_hid_generic))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static const struct hid_device_id hid_table[] = {
|
|
{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY, HID_ANY_ID, HID_ANY_ID) },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(hid, hid_table);
|
|
|
|
static struct hid_driver hid_generic = {
|
|
.name = "hid-generic",
|
|
.id_table = hid_table,
|
|
.match = hid_generic_match,
|
|
.bus_add_driver = hid_generic_add_driver,
|
|
.bus_removed_driver = hid_generic_removed_driver,
|
|
};
|
|
module_hid_driver(hid_generic);
|
|
|
|
MODULE_AUTHOR("Henrik Rydberg");
|
|
MODULE_DESCRIPTION("HID generic driver");
|
|
MODULE_LICENSE("GPL");
|