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 24 static struct hid_driver hid_generic; 25 26 static 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 37 static 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 56 static 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 70 static const struct hid_device_id hid_table[] = { 71 { HID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY, HID_ANY_ID, HID_ANY_ID) }, 72 { } 73 }; 74 MODULE_DEVICE_TABLE(hid, hid_table); 75 76 static 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 }; 82 module_hid_driver(hid_generic); 83 84 MODULE_AUTHOR("Henrik Rydberg"); 85 MODULE_DESCRIPTION("HID generic driver"); 86 MODULE_LICENSE("GPL"); 87