drivers/hid/usbhid/hid-quirks.c

   1 /*
   2  *  USB HID quirks support for Linux
   3  *
   4  *  Copyright (c) 1999 Andreas Gal
   5  *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
   6  *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
   7  *  Copyright (c) 2006-2007 Jiri Kosina
   8  *  Copyright (c) 2007 Paul Walmsley
   9  */
  10
  11 /*
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU General Public License as published by the Free
  14  * Software Foundation; either version 2 of the License, or (at your option)
  15  * any later version.
  16  */
  17
  18 #include <linux/hid.h>
  19 #include <linux/export.h>
  20 #include <linux/slab.h>
  21
  22 #include "../hid-ids.h"
  23
  24 /*
  25  * Alphabetically sorted blacklist by quirk type.
  26  */
  27
  28 static const struct hid_blacklist {
  29         __u16 idVendor;
  30         __u16 idProduct;
  31         __u32 quirks;
  32 } hid_blacklist[] = {
  33         { USB_VENDOR_ID_AASHIMA, USB_DEVICE_ID_AASHIMA_GAMEPAD, HID_QUIRK_BADPAD },
  34         { USB_VENDOR_ID_AASHIMA, USB_DEVICE_ID_AASHIMA_PREDATOR, HID_QUIRK_BADPAD },
  35         { USB_VENDOR_ID_ALPS, USB_DEVICE_ID_IBM_GAMEPAD, HID_QUIRK_BADPAD },
  36         { USB_VENDOR_ID_CHIC, USB_DEVICE_ID_CHIC_GAMEPAD, HID_QUIRK_BADPAD },
  37         { USB_VENDOR_ID_DWAV, USB_DEVICE_ID_EGALAX_TOUCHCONTROLLER, HID_QUIRK_MULTI_INPUT | HID_QUIRK_NOGET },
  38         { USB_VENDOR_ID_MOJO, USB_DEVICE_ID_RETRO_ADAPTER, HID_QUIRK_MULTI_INPUT },
  39         { USB_VENDOR_ID_HAPP, USB_DEVICE_ID_UGCI_DRIVING, HID_QUIRK_BADPAD | HID_QUIRK_MULTI_INPUT },
  40         { USB_VENDOR_ID_HAPP, USB_DEVICE_ID_UGCI_FLYING, HID_QUIRK_BADPAD | HID_QUIRK_MULTI_INPUT },
  41         { USB_VENDOR_ID_HAPP, USB_DEVICE_ID_UGCI_FIGHTING, HID_QUIRK_BADPAD | HID_QUIRK_MULTI_INPUT },
  42         { USB_VENDOR_ID_NATSU, USB_DEVICE_ID_NATSU_GAMEPAD, HID_QUIRK_BADPAD },
  43         { USB_VENDOR_ID_NEC, USB_DEVICE_ID_NEC_USB_GAME_PAD, HID_QUIRK_BADPAD },
  44         { USB_VENDOR_ID_NEXTWINDOW, USB_DEVICE_ID_NEXTWINDOW_TOUCHSCREEN, HID_QUIRK_MULTI_INPUT},
  45         { USB_VENDOR_ID_SAITEK, USB_DEVICE_ID_SAITEK_RUMBLEPAD, HID_QUIRK_BADPAD },
  46         { USB_VENDOR_ID_TOPMAX, USB_DEVICE_ID_TOPMAX_COBRAPAD, HID_QUIRK_BADPAD },
  47
  48         { USB_VENDOR_ID_AFATECH, USB_DEVICE_ID_AFATECH_AF9016, HID_QUIRK_FULLSPEED_INTERVAL },
  49
  50         { USB_VENDOR_ID_EMS, USB_DEVICE_ID_EMS_TRIO_LINKER_PLUS_II, HID_QUIRK_MULTI_INPUT },
  51         { USB_VENDOR_ID_ETURBOTOUCH, USB_DEVICE_ID_ETURBOTOUCH, HID_QUIRK_MULTI_INPUT },
  52         { USB_VENDOR_ID_ETURBOTOUCH, USB_DEVICE_ID_ETURBOTOUCH_2968, HID_QUIRK_MULTI_INPUT },
  53         { USB_VENDOR_ID_GREENASIA, USB_DEVICE_ID_GREENASIA_DUAL_USB_JOYPAD, HID_QUIRK_MULTI_INPUT },
  54         { USB_VENDOR_ID_PANTHERLORD, USB_DEVICE_ID_PANTHERLORD_TWIN_USB_JOYSTICK, HID_QUIRK_MULTI_INPUT | HID_QUIRK_SKIP_OUTPUT_REPORTS },
  55         { USB_VENDOR_ID_PLAYDOTCOM, USB_DEVICE_ID_PLAYDOTCOM_EMS_USBII, HID_QUIRK_MULTI_INPUT },
  56         { USB_VENDOR_ID_TOUCHPACK, USB_DEVICE_ID_TOUCHPACK_RTS, HID_QUIRK_MULTI_INPUT },
  57
  58         { USB_VENDOR_ID_AIREN, USB_DEVICE_ID_AIREN_SLIMPLUS, HID_QUIRK_NOGET },
  59         { USB_VENDOR_ID_ATEN, USB_DEVICE_ID_ATEN_UC100KM, HID_QUIRK_NOGET },
  60         { USB_VENDOR_ID_ATEN, USB_DEVICE_ID_ATEN_CS124U, HID_QUIRK_NOGET },
  61         { USB_VENDOR_ID_ATEN, USB_DEVICE_ID_ATEN_2PORTKVM, HID_QUIRK_NOGET },
  62         { USB_VENDOR_ID_ATEN, USB_DEVICE_ID_ATEN_4PORTKVM, HID_QUIRK_NOGET },
  63         { USB_VENDOR_ID_ATEN, USB_DEVICE_ID_ATEN_4PORTKVMC, HID_QUIRK_NOGET },
  64         { USB_VENDOR_ID_CH, USB_DEVICE_ID_CH_FIGHTERSTICK, HID_QUIRK_NOGET },
  65         { USB_VENDOR_ID_CH, USB_DEVICE_ID_CH_COMBATSTICK, HID_QUIRK_NOGET },
  66         { USB_VENDOR_ID_CH, USB_DEVICE_ID_CH_FLIGHT_SIM_ECLIPSE_YOKE, HID_QUIRK_NOGET },
  67         { USB_VENDOR_ID_CH, USB_DEVICE_ID_CH_FLIGHT_SIM_YOKE, HID_QUIRK_NOGET },
  68         { USB_VENDOR_ID_CH, USB_DEVICE_ID_CH_PRO_THROTTLE, HID_QUIRK_NOGET },
  69         { USB_VENDOR_ID_CH, USB_DEVICE_ID_CH_PRO_PEDALS, HID_QUIRK_NOGET },
  70         { USB_VENDOR_ID_CH, USB_DEVICE_ID_CH_3AXIS_5BUTTON_STICK, HID_QUIRK_NOGET },
  71         { USB_VENDOR_ID_CH, USB_DEVICE_ID_CH_AXIS_295, HID_QUIRK_NOGET },
  72         { USB_VENDOR_ID_DMI, USB_DEVICE_ID_DMI_ENC, HID_QUIRK_NOGET },
  73         { USB_VENDOR_ID_ELO, USB_DEVICE_ID_ELO_TS2700, HID_QUIRK_NOGET },
  74         { USB_VENDOR_ID_FORMOSA, USB_DEVICE_ID_FORMOSA_IR_RECEIVER, HID_QUIRK_NO_INIT_REPORTS },
  75         { USB_VENDOR_ID_FREESCALE, USB_DEVICE_ID_FREESCALE_MX28, HID_QUIRK_NOGET },
  76         { USB_VENDOR_ID_MGE, USB_DEVICE_ID_MGE_UPS, HID_QUIRK_NOGET },
  77         { USB_VENDOR_ID_MSI, USB_DEVICE_ID_MSI_GT683R_LED_PANEL, HID_QUIRK_NO_INIT_REPORTS },
  78         { USB_VENDOR_ID_NEXIO, USB_DEVICE_ID_NEXIO_MULTITOUCH_PTI0750, HID_QUIRK_NO_INIT_REPORTS },
  79         { USB_VENDOR_ID_NOVATEK, USB_DEVICE_ID_NOVATEK_MOUSE, HID_QUIRK_NO_INIT_REPORTS },
  80         { USB_VENDOR_ID_PENMOUNT, USB_DEVICE_ID_PENMOUNT_1610, HID_QUIRK_NOGET },
  81         { USB_VENDOR_ID_PENMOUNT, USB_DEVICE_ID_PENMOUNT_1640, HID_QUIRK_NOGET },
  82         { USB_VENDOR_ID_PIXART, USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN, HID_QUIRK_NO_INIT_REPORTS },
  83         { USB_VENDOR_ID_PIXART, USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN1, HID_QUIRK_NO_INIT_REPORTS },
  84         { USB_VENDOR_ID_PIXART, USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN2, HID_QUIRK_NO_INIT_REPORTS },
  85         { USB_VENDOR_ID_PRODIGE, USB_DEVICE_ID_PRODIGE_CORDLESS, HID_QUIRK_NOGET },
  86         { USB_VENDOR_ID_QUANTA, USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH_3001, HID_QUIRK_NOGET },
  87         { USB_VENDOR_ID_QUANTA, USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH_3008, HID_QUIRK_NOGET },
  88         { USB_VENDOR_ID_REALTEK, USB_DEVICE_ID_REALTEK_READER, HID_QUIRK_NO_INIT_REPORTS },
  89         { USB_VENDOR_ID_SENNHEISER, USB_DEVICE_ID_SENNHEISER_BTD500USB, HID_QUIRK_NOGET },
  90         { USB_VENDOR_ID_SIGMATEL, USB_DEVICE_ID_SIGMATEL_STMP3780, HID_QUIRK_NOGET },
  91         { USB_VENDOR_ID_SIS_TOUCH, USB_DEVICE_ID_SIS9200_TOUCH, HID_QUIRK_NOGET },
  92         { USB_VENDOR_ID_SIS_TOUCH, USB_DEVICE_ID_SIS817_TOUCH, HID_QUIRK_NOGET },
  93         { USB_VENDOR_ID_SIS_TOUCH, USB_DEVICE_ID_SIS_TS, HID_QUIRK_NO_INIT_REPORTS },
  94         { USB_VENDOR_ID_SIS_TOUCH, USB_DEVICE_ID_SIS1030_TOUCH, HID_QUIRK_NOGET },
  95         { USB_VENDOR_ID_SUN, USB_DEVICE_ID_RARITAN_KVM_DONGLE, HID_QUIRK_NOGET },
  96         { USB_VENDOR_ID_SYMBOL, USB_DEVICE_ID_SYMBOL_SCANNER_1, HID_QUIRK_NOGET },
  97         { USB_VENDOR_ID_SYMBOL, USB_DEVICE_ID_SYMBOL_SCANNER_2, HID_QUIRK_NOGET },
  98         { USB_VENDOR_ID_TPV, USB_DEVICE_ID_TPV_OPTICAL_TOUCHSCREEN, HID_QUIRK_NOGET },
  99         { USB_VENDOR_ID_TURBOX, USB_DEVICE_ID_TURBOX_KEYBOARD, HID_QUIRK_NOGET },
 100         { USB_VENDOR_ID_UCLOGIC, USB_DEVICE_ID_UCLOGIC_TABLET_PF1209, HID_QUIRK_MULTI_INPUT },
 101         { USB_VENDOR_ID_UCLOGIC, USB_DEVICE_ID_UCLOGIC_TABLET_WP4030U, HID_QUIRK_MULTI_INPUT },
 102         { USB_VENDOR_ID_UCLOGIC, USB_DEVICE_ID_UCLOGIC_TABLET_KNA5, HID_QUIRK_MULTI_INPUT },
 103         { USB_VENDOR_ID_UCLOGIC, USB_DEVICE_ID_UCLOGIC_TABLET_TWA60, HID_QUIRK_MULTI_INPUT },
 104         { USB_VENDOR_ID_UCLOGIC, USB_DEVICE_ID_UCLOGIC_TABLET_WP5540U, HID_QUIRK_MULTI_INPUT },
 105         { USB_VENDOR_ID_UCLOGIC, USB_DEVICE_ID_UCLOGIC_TABLET_WP8060U, HID_QUIRK_MULTI_INPUT },
 106         { USB_VENDOR_ID_WALTOP, USB_DEVICE_ID_WALTOP_MEDIA_TABLET_10_6_INCH, HID_QUIRK_MULTI_INPUT },
 107         { USB_VENDOR_ID_WALTOP, USB_DEVICE_ID_WALTOP_MEDIA_TABLET_14_1_INCH, HID_QUIRK_MULTI_INPUT },
 108         { USB_VENDOR_ID_WALTOP, USB_DEVICE_ID_WALTOP_SIRIUS_BATTERY_FREE_TABLET, HID_QUIRK_MULTI_INPUT },
 109         { USB_VENDOR_ID_WISEGROUP, USB_DEVICE_ID_QUAD_USB_JOYPAD, HID_QUIRK_NOGET | HID_QUIRK_MULTI_INPUT },
 110
 111         { USB_VENDOR_ID_WISEGROUP_LTD2, USB_DEVICE_ID_SMARTJOY_DUAL_PLUS, HID_QUIRK_NOGET | HID_QUIRK_MULTI_INPUT },
 112
 113         { USB_VENDOR_ID_PI_ENGINEERING, USB_DEVICE_ID_PI_ENGINEERING_VEC_USB_FOOTPEDAL, HID_QUIRK_HIDINPUT_FORCE },
 114
 115         { USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_MULTI_TOUCH, HID_QUIRK_MULTI_INPUT },
 116         { USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_WIRELESS, HID_QUIRK_MULTI_INPUT },
 117         { USB_VENDOR_ID_SIGMA_MICRO, USB_DEVICE_ID_SIGMA_MICRO_KEYBOARD, HID_QUIRK_NO_INIT_REPORTS },
 118         { USB_VENDOR_ID_KYE, USB_DEVICE_ID_KYE_MOUSEPEN_I608X, HID_QUIRK_MULTI_INPUT },
 119         { USB_VENDOR_ID_KYE, USB_DEVICE_ID_KYE_EASYPEN_M610X, HID_QUIRK_MULTI_INPUT },
 120         { USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_DUOSENSE, HID_QUIRK_NO_INIT_REPORTS },
 121         { USB_VENDOR_ID_SEMICO, USB_DEVICE_ID_SEMICO_USB_KEYKOARD, HID_QUIRK_NO_INIT_REPORTS },
 122         { USB_VENDOR_ID_SYNAPTICS, USB_DEVICE_ID_SYNAPTICS_LTS1, HID_QUIRK_NO_INIT_REPORTS },
 123         { USB_VENDOR_ID_SYNAPTICS, USB_DEVICE_ID_SYNAPTICS_LTS2, HID_QUIRK_NO_INIT_REPORTS },
 124         { USB_VENDOR_ID_SYNAPTICS, USB_DEVICE_ID_SYNAPTICS_HD, HID_QUIRK_NO_INIT_REPORTS },
 125         { USB_VENDOR_ID_SYNAPTICS, USB_DEVICE_ID_SYNAPTICS_QUAD_HD, HID_QUIRK_NO_INIT_REPORTS },
 126         { USB_VENDOR_ID_SYNAPTICS, USB_DEVICE_ID_SYNAPTICS_TP_V103, HID_QUIRK_NO_INIT_REPORTS },
 127         { USB_VENDOR_ID_HOLTEK_ALT, USB_DEVICE_ID_HOLTEK_ALT_KEYBOARD_A096, HID_QUIRK_NO_INIT_INPUT_REPORTS },
 128
 129         { 0, 0 }
 130 };
 131
 132 /* Dynamic HID quirks list - specified at runtime */
 133 struct quirks_list_struct {
 134         struct hid_blacklist hid_bl_item;
 135         struct list_head node;
 136 };
 137
 138 static LIST_HEAD(dquirks_list);
 139 static DECLARE_RWSEM(dquirks_rwsem);
 140
 141 /* Runtime ("dynamic") quirks manipulation functions */
 142
 143 /**
 144  * usbhid_exists_dquirk: find any dynamic quirks for a USB HID device
 145  * @idVendor: the 16-bit USB vendor ID, in native byteorder
 146  * @idProduct: the 16-bit USB product ID, in native byteorder
 147  *
 148  * Description:
 149  *         Scans dquirks_list for a matching dynamic quirk and returns
 150  *         the pointer to the relevant struct hid_blacklist if found.
 151  *         Must be called with a read lock held on dquirks_rwsem.
 152  *
 153  * Returns: NULL if no quirk found, struct hid_blacklist * if found.
 154  */
 155 static struct hid_blacklist *usbhid_exists_dquirk(const u16 idVendor,
 156                 const u16 idProduct)
 157 {
 158         struct quirks_list_struct *q;
 159         struct hid_blacklist *bl_entry = NULL;
 160
 161         list_for_each_entry(q, &dquirks_list, node) {
 162                 if (q->hid_bl_item.idVendor == idVendor &&
 163                                 q->hid_bl_item.idProduct == idProduct) {
 164                         bl_entry = &q->hid_bl_item;
 165                         break;
 166                 }
 167         }
 168
 169         if (bl_entry != NULL)
 170                 dbg_hid("Found dynamic quirk 0x%x for USB HID vendor 0x%hx prod 0x%hx\n",
 171                                 bl_entry->quirks, bl_entry->idVendor,
 172                                 bl_entry->idProduct);
 173
 174         return bl_entry;
 175 }
 176
 177
 178 /**
 179  * usbhid_modify_dquirk: add/replace a HID quirk
 180  * @idVendor: the 16-bit USB vendor ID, in native byteorder
 181  * @idProduct: the 16-bit USB product ID, in native byteorder
 182  * @quirks: the u32 quirks value to add/replace
 183  *
 184  * Description:
 185  *         If an dynamic quirk exists in memory for this (idVendor,
 186  *         idProduct) pair, replace its quirks value with what was
 187  *         provided.  Otherwise, add the quirk to the dynamic quirks list.
 188  *
 189  * Returns: 0 OK, -error on failure.
 190  */
 191 static int usbhid_modify_dquirk(const u16 idVendor, const u16 idProduct,
 192                                 const u32 quirks)
 193 {
 194         struct quirks_list_struct *q_new, *q;
 195         int list_edited = 0;
 196
 197         if (!idVendor) {
 198                 dbg_hid("Cannot add a quirk with idVendor = 0\n");
 199                 return -EINVAL;
 200         }
 201
 202         q_new = kmalloc(sizeof(struct quirks_list_struct), GFP_KERNEL);
 203         if (!q_new) {
 204                 dbg_hid("Could not allocate quirks_list_struct\n");
 205                 return -ENOMEM;
 206         }
 207
 208         q_new->hid_bl_item.idVendor = idVendor;
 209         q_new->hid_bl_item.idProduct = idProduct;
 210         q_new->hid_bl_item.quirks = quirks;
 211
 212         down_write(&dquirks_rwsem);
 213
 214         list_for_each_entry(q, &dquirks_list, node) {
 215
 216                 if (q->hid_bl_item.idVendor == idVendor &&
 217                                 q->hid_bl_item.idProduct == idProduct) {
 218
 219                         list_replace(&q->node, &q_new->node);
 220                         kfree(q);
 221                         list_edited = 1;
 222                         break;
 223
 224                 }
 225
 226         }
 227
 228         if (!list_edited)
 229                 list_add_tail(&q_new->node, &dquirks_list);
 230
 231         up_write(&dquirks_rwsem);
 232
 233         return 0;
 234 }
 235
 236 /**
 237  * usbhid_remove_all_dquirks: remove all runtime HID quirks from memory
 238  *
 239  * Description:
 240  *         Free all memory associated with dynamic quirks - called before
 241  *         module unload.
 242  *
 243  */
 244 static void usbhid_remove_all_dquirks(void)
 245 {
 246         struct quirks_list_struct *q, *temp;
 247
 248         down_write(&dquirks_rwsem);
 249         list_for_each_entry_safe(q, temp, &dquirks_list, node) {
 250                 list_del(&q->node);
 251                 kfree(q);
 252         }
 253         up_write(&dquirks_rwsem);
 254
 255 }
 256
 257 /**
 258  * usbhid_quirks_init: apply USB HID quirks specified at module load time
 259  */
 260 int usbhid_quirks_init(char **quirks_param)
 261 {
 262         u16 idVendor, idProduct;
 263         u32 quirks;
 264         int n = 0, m;
 265
 266         for (; n < MAX_USBHID_BOOT_QUIRKS && quirks_param[n]; n++) {
 267
 268                 m = sscanf(quirks_param[n], "0x%hx:0x%hx:0x%x",
 269                                 &idVendor, &idProduct, &quirks);
 270
 271                 if (m != 3 ||
 272                                 usbhid_modify_dquirk(idVendor, idProduct, quirks) != 0) {
 273                         printk(KERN_WARNING
 274                                         "Could not parse HID quirk module param %s\n",
 275                                         quirks_param[n]);
 276                 }
 277         }
 278
 279         return 0;
 280 }
 281
 282 /**
 283  * usbhid_quirks_exit: release memory associated with dynamic_quirks
 284  *
 285  * Description:
 286  *     Release all memory associated with dynamic quirks.  Called upon
 287  *     module unload.
 288  *
 289  * Returns: nothing
 290  */
 291 void usbhid_quirks_exit(void)
 292 {
 293         usbhid_remove_all_dquirks();
 294 }
 295
 296 /**
 297  * usbhid_exists_squirk: return any static quirks for a USB HID device
 298  * @idVendor: the 16-bit USB vendor ID, in native byteorder
 299  * @idProduct: the 16-bit USB product ID, in native byteorder
 300  *
 301  * Description:
 302  *     Given a USB vendor ID and product ID, return a pointer to
 303  *     the hid_blacklist entry associated with that device.
 304  *
 305  * Returns: pointer if quirk found, or NULL if no quirks found.
 306  */
 307 static const struct hid_blacklist *usbhid_exists_squirk(const u16 idVendor,
 308                 const u16 idProduct)
 309 {
 310         const struct hid_blacklist *bl_entry = NULL;
 311         int n = 0;
 312
 313         for (; hid_blacklist[n].idVendor; n++)
 314                 if (hid_blacklist[n].idVendor == idVendor &&
 315                                 hid_blacklist[n].idProduct == idProduct)
 316                         bl_entry = &hid_blacklist[n];
 317
 318         if (bl_entry != NULL)
 319                 dbg_hid("Found squirk 0x%x for USB HID vendor 0x%hx prod 0x%hx\n",
 320                                 bl_entry->quirks, bl_entry->idVendor,
 321                                 bl_entry->idProduct);
 322         return bl_entry;
 323 }
 324
 325 /**
 326  * usbhid_lookup_quirk: return any quirks associated with a USB HID device
 327  * @idVendor: the 16-bit USB vendor ID, in native byteorder
 328  * @idProduct: the 16-bit USB product ID, in native byteorder
 329  *
 330  * Description:
 331  *     Given a USB vendor ID and product ID, return any quirks associated
 332  *     with that device.
 333  *
 334  * Returns: a u32 quirks value.
 335  */
 336 u32 usbhid_lookup_quirk(const u16 idVendor, const u16 idProduct)
 337 {
 338         u32 quirks = 0;
 339         const struct hid_blacklist *bl_entry = NULL;
 340
 341         /* NCR devices must not be queried for reports */
 342         if (idVendor == USB_VENDOR_ID_NCR &&
 343                         idProduct >= USB_DEVICE_ID_NCR_FIRST &&
 344                         idProduct <= USB_DEVICE_ID_NCR_LAST)
 345                         return HID_QUIRK_NO_INIT_REPORTS;
 346
 347         down_read(&dquirks_rwsem);
 348         bl_entry = usbhid_exists_dquirk(idVendor, idProduct);
 349         if (!bl_entry)
 350                 bl_entry = usbhid_exists_squirk(idVendor, idProduct);
 351         if (bl_entry)
 352                 quirks = bl_entry->quirks;
 353         up_read(&dquirks_rwsem);
 354
 355         return quirks;
 356 }
 357
 358 EXPORT_SYMBOL_GPL(usbhid_lookup_quirk);