LXR linux/drivers/hid/hid-generic.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *  HID support for Linux
   4 *
   5 *  Copyright (c) 1999 Andreas Gal
   6 *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
   7 *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
   8 *  Copyright (c) 2007-2008 Oliver Neukum
   9 *  Copyright (c) 2006-2012 Jiri Kosina
  10 *  Copyright (c) 2012 Henrik Rydberg
  11 */
  12
  13/*
  14 */
  15
  16#include <linux/module.h>
  17#include <linux/slab.h>
  18#include <linux/kernel.h>
  19#include <asm/unaligned.h>
  20#include <asm/byteorder.h>
  21
  22#include <linux/hid.h>
  23
  24static struct hid_driver hid_generic;
  25
  26static int __check_hid_generic(struct device_driver *drv, void *data)
  27{
  28        struct hid_driver *hdrv = to_hid_driver(drv);
  29        struct hid_device *hdev = data;
  30
  31        if (hdrv == &hid_generic)
  32                return 0;
  33
  34        return hid_match_device(hdev, hdrv) != NULL;
  35}
  36
  37static bool hid_generic_match(struct hid_device *hdev,
  38                              bool ignore_special_driver)
  39{
  40        if (ignore_special_driver)
  41                return true;
  42
  43        if (hdev->quirks & HID_QUIRK_HAVE_SPECIAL_DRIVER)
  44                return false;
  45
  46        /*
  47         * If any other driver wants the device, leave the device to this other
  48         * driver.
  49         */
  50        if (bus_for_each_drv(&hid_bus_type, NULL, hdev, __check_hid_generic))
  51                return false;
  52
  53        return true;
  54}
  55
  56static int hid_generic_probe(struct hid_device *hdev,
  57                             const struct hid_device_id *id)
  58{
  59        int ret;
  60
  61        hdev->quirks |= HID_QUIRK_INPUT_PER_APP;
  62
  63        ret = hid_parse(hdev);
  64        if (ret)
  65                return ret;
  66
  67        return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
  68}
  69
  70static const struct hid_device_id hid_table[] = {
  71        { HID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY, HID_ANY_ID, HID_ANY_ID) },
  72        { }
  73};
  74MODULE_DEVICE_TABLE(hid, hid_table);
  75
  76static struct hid_driver hid_generic = {
  77        .name = "hid-generic",
  78        .id_table = hid_table,
  79        .match = hid_generic_match,
  80        .probe = hid_generic_probe,
  81};
  82module_hid_driver(hid_generic);
  83
  84MODULE_AUTHOR("Henrik Rydberg");
  85MODULE_DESCRIPTION("HID generic driver");
  86MODULE_LICENSE("GPL");
  87