text: /*
   *  USB HID quirks 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) 2006-2007 Jiri Kosina
   *  Copyright (c) 2007 Paul Walmsley
   */
  
  /*
   * 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/hid.h>
  #include <linux/export.h>
  #include <linux/slab.h>
  
  #include "../hid-ids.h"
  
  /*
   * Alphabetically sorted blacklist by quirk type.
   */
  
  static const struct hid_blacklist {
  	__u16 idVendor;
  	__u16 idProduct;
  	__u32 quirks;
  } hid_blacklist[] = {
  	{ USB_VENDOR_ID_AASHIMA, USB_DEVICE_ID_AASHIMA_GAMEPAD, HID_QUIRK_BADPAD },
  	{ USB_VENDOR_ID_AASHIMA, USB_DEVICE_ID_AASHIMA_PREDATOR, HID_QUIRK_BADPAD },
  	{ USB_VENDOR_ID_ALPS, USB_DEVICE_ID_IBM_GAMEPAD, HID_QUIRK_BADPAD },
  	{ USB_VENDOR_ID_CHIC, USB_DEVICE_ID_CHIC_GAMEPAD, HID_QUIRK_BADPAD },
  	{ USB_VENDOR_ID_DWAV, USB_DEVICE_ID_EGALAX_TOUCHCONTROLLER, HID_QUIRK_MULTI_INPUT | HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_MOJO, USB_DEVICE_ID_RETRO_ADAPTER, HID_QUIRK_MULTI_INPUT },
  	{ USB_VENDOR_ID_HAPP, USB_DEVICE_ID_UGCI_DRIVING, HID_QUIRK_BADPAD | HID_QUIRK_MULTI_INPUT },
  	{ USB_VENDOR_ID_HAPP, USB_DEVICE_ID_UGCI_FLYING, HID_QUIRK_BADPAD | HID_QUIRK_MULTI_INPUT },
  	{ USB_VENDOR_ID_HAPP, USB_DEVICE_ID_UGCI_FIGHTING, HID_QUIRK_BADPAD | HID_QUIRK_MULTI_INPUT },
  	{ USB_VENDOR_ID_NATSU, USB_DEVICE_ID_NATSU_GAMEPAD, HID_QUIRK_BADPAD },
  	{ USB_VENDOR_ID_NEC, USB_DEVICE_ID_NEC_USB_GAME_PAD, HID_QUIRK_BADPAD },
  	{ USB_VENDOR_ID_NEXTWINDOW, USB_DEVICE_ID_NEXTWINDOW_TOUCHSCREEN, HID_QUIRK_MULTI_INPUT},
  	{ USB_VENDOR_ID_SAITEK, USB_DEVICE_ID_SAITEK_RUMBLEPAD, HID_QUIRK_BADPAD },
  	{ USB_VENDOR_ID_TOPMAX, USB_DEVICE_ID_TOPMAX_COBRAPAD, HID_QUIRK_BADPAD },
  
  	{ USB_VENDOR_ID_AFATECH, USB_DEVICE_ID_AFATECH_AF9016, HID_QUIRK_FULLSPEED_INTERVAL },
  
  	{ USB_VENDOR_ID_EMS, USB_DEVICE_ID_EMS_TRIO_LINKER_PLUS_II, HID_QUIRK_MULTI_INPUT },
  	{ USB_VENDOR_ID_ETURBOTOUCH, USB_DEVICE_ID_ETURBOTOUCH, HID_QUIRK_MULTI_INPUT },
  	{ USB_VENDOR_ID_ETURBOTOUCH, USB_DEVICE_ID_ETURBOTOUCH_2968, HID_QUIRK_MULTI_INPUT },
  	{ USB_VENDOR_ID_GREENASIA, USB_DEVICE_ID_GREENASIA_DUAL_USB_JOYPAD, HID_QUIRK_MULTI_INPUT },
  	{ USB_VENDOR_ID_PANTHERLORD, USB_DEVICE_ID_PANTHERLORD_TWIN_USB_JOYSTICK, HID_QUIRK_MULTI_INPUT | HID_QUIRK_SKIP_OUTPUT_REPORTS },
  	{ USB_VENDOR_ID_PLAYDOTCOM, USB_DEVICE_ID_PLAYDOTCOM_EMS_USBII, HID_QUIRK_MULTI_INPUT },
  	{ USB_VENDOR_ID_TOUCHPACK, USB_DEVICE_ID_TOUCHPACK_RTS, HID_QUIRK_MULTI_INPUT },
  
  	{ USB_VENDOR_ID_AIREN, USB_DEVICE_ID_AIREN_SLIMPLUS, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_ATEN, USB_DEVICE_ID_ATEN_UC100KM, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_ATEN, USB_DEVICE_ID_ATEN_CS124U, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_ATEN, USB_DEVICE_ID_ATEN_2PORTKVM, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_ATEN, USB_DEVICE_ID_ATEN_4PORTKVM, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_ATEN, USB_DEVICE_ID_ATEN_4PORTKVMC, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_CH, USB_DEVICE_ID_CH_FIGHTERSTICK, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_CH, USB_DEVICE_ID_CH_COMBATSTICK, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_CH, USB_DEVICE_ID_CH_FLIGHT_SIM_ECLIPSE_YOKE, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_CH, USB_DEVICE_ID_CH_FLIGHT_SIM_YOKE, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_CH, USB_DEVICE_ID_CH_PRO_THROTTLE, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_CH, USB_DEVICE_ID_CH_PRO_PEDALS, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_CH, USB_DEVICE_ID_CH_3AXIS_5BUTTON_STICK, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_CH, USB_DEVICE_ID_CH_AXIS_295, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_DMI, USB_DEVICE_ID_DMI_ENC, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_ELAN, USB_DEVICE_ID_ELAN_TOUCHSCREEN, HID_QUIRK_ALWAYS_POLL },
  	{ USB_VENDOR_ID_ELAN, USB_DEVICE_ID_ELAN_TOUCHSCREEN_009B, HID_QUIRK_ALWAYS_POLL },
  	{ USB_VENDOR_ID_ELAN, USB_DEVICE_ID_ELAN_TOUCHSCREEN_0103, HID_QUIRK_ALWAYS_POLL },
  	{ USB_VENDOR_ID_ELAN, USB_DEVICE_ID_ELAN_TOUCHSCREEN_010c, HID_QUIRK_ALWAYS_POLL },
  	{ USB_VENDOR_ID_ELAN, USB_DEVICE_ID_ELAN_TOUCHSCREEN_016F, HID_QUIRK_ALWAYS_POLL },
  	{ USB_VENDOR_ID_ELO, USB_DEVICE_ID_ELO_TS2700, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_FORMOSA, USB_DEVICE_ID_FORMOSA_IR_RECEIVER, HID_QUIRK_NO_INIT_REPORTS },
  	{ USB_VENDOR_ID_FREESCALE, USB_DEVICE_ID_FREESCALE_MX28, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_C077, HID_QUIRK_ALWAYS_POLL },
  	{ USB_VENDOR_ID_MGE, USB_DEVICE_ID_MGE_UPS, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_TYPE_COVER_3, HID_QUIRK_NO_INIT_REPORTS },
  	{ USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_TYPE_COVER_3_JP, HID_QUIRK_NO_INIT_REPORTS },
  	{ USB_VENDOR_ID_MSI, USB_DEVICE_ID_MSI_GT683R_LED_PANEL, HID_QUIRK_NO_INIT_REPORTS },
  	{ USB_VENDOR_ID_NEXIO, USB_DEVICE_ID_NEXIO_MULTITOUCH_PTI0750, HID_QUIRK_NO_INIT_REPORTS },
  	{ USB_VENDOR_ID_NOVATEK, USB_DEVICE_ID_NOVATEK_MOUSE, HID_QUIRK_NO_INIT_REPORTS },
  	{ USB_VENDOR_ID_PENMOUNT, USB_DEVICE_ID_PENMOUNT_1610, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_PENMOUNT, USB_DEVICE_ID_PENMOUNT_1640, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_PIXART, USB_DEVICE_ID_PIXART_USB_OPTICAL_MOUSE, HID_QUIRK_ALWAYS_POLL },
  	{ USB_VENDOR_ID_KYE, USB_DEVICE_ID_PIXART_USB_OPTICAL_MOUSE_ID2, HID_QUIRK_ALWAYS_POLL },
  	{ USB_VENDOR_ID_PIXART, USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN, HID_QUIRK_NO_INIT_REPORTS },
  	{ USB_VENDOR_ID_PIXART, USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN1, HID_QUIRK_NO_INIT_REPORTS },
  	{ USB_VENDOR_ID_PIXART, USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN2, HID_QUIRK_NO_INIT_REPORTS },
  	{ USB_VENDOR_ID_PRODIGE, USB_DEVICE_ID_PRODIGE_CORDLESS, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_QUANTA, USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH_3001, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_QUANTA, USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH_3008, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_REALTEK, USB_DEVICE_ID_REALTEK_READER, HID_QUIRK_NO_INIT_REPORTS },
  	{ USB_VENDOR_ID_SENNHEISER, USB_DEVICE_ID_SENNHEISER_BTD500USB, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_SIGMATEL, USB_DEVICE_ID_SIGMATEL_STMP3780, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_SIS_TOUCH, USB_DEVICE_ID_SIS9200_TOUCH, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_SIS_TOUCH, USB_DEVICE_ID_SIS817_TOUCH, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_SIS_TOUCH, USB_DEVICE_ID_SIS_TS, HID_QUIRK_NO_INIT_REPORTS },
  	{ USB_VENDOR_ID_SIS_TOUCH, USB_DEVICE_ID_SIS1030_TOUCH, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_SUN, USB_DEVICE_ID_RARITAN_KVM_DONGLE, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_SYMBOL, USB_DEVICE_ID_SYMBOL_SCANNER_1, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_SYMBOL, USB_DEVICE_ID_SYMBOL_SCANNER_2, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_TPV, USB_DEVICE_ID_TPV_OPTICAL_TOUCHSCREEN, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_TURBOX, USB_DEVICE_ID_TURBOX_KEYBOARD, HID_QUIRK_NOGET },
  	{ USB_VENDOR_ID_UCLOGIC, USB_DEVICE_ID_UCLOGIC_TABLET_PF1209, HID_QUIRK_MULTI_INPUT },
  	{ USB_VENDOR_ID_UCLOGIC, USB_DEVICE_ID_UCLOGIC_TABLET_WP4030U, HID_QUIRK_MULTI_INPUT },
  	{ USB_VENDOR_ID_UCLOGIC, USB_DEVICE_ID_UCLOGIC_TABLET_KNA5, HID_QUIRK_MULTI_INPUT },
  	{ USB_VENDOR_ID_UCLOGIC, USB_DEVICE_ID_UCLOGIC_TABLET_TWA60, HID_QUIRK_MULTI_INPUT },
  	{ USB_VENDOR_ID_UCLOGIC, USB_DEVICE_ID_UCLOGIC_TABLET_WP5540U, HID_QUIRK_MULTI_INPUT },
  	{ USB_VENDOR_ID_UCLOGIC, USB_DEVICE_ID_UCLOGIC_TABLET_WP8060U, HID_QUIRK_MULTI_INPUT },
  	{ USB_VENDOR_ID_WALTOP, USB_DEVICE_ID_WALTOP_MEDIA_TABLET_10_6_INCH, HID_QUIRK_MULTI_INPUT },
  	{ USB_VENDOR_ID_WALTOP, USB_DEVICE_ID_WALTOP_MEDIA_TABLET_14_1_INCH, HID_QUIRK_MULTI_INPUT },
  	{ USB_VENDOR_ID_WALTOP, USB_DEVICE_ID_WALTOP_SIRIUS_BATTERY_FREE_TABLET, HID_QUIRK_MULTI_INPUT },
  	{ USB_VENDOR_ID_WISEGROUP, USB_DEVICE_ID_QUAD_USB_JOYPAD, HID_QUIRK_NOGET | HID_QUIRK_MULTI_INPUT },
  
  	{ USB_VENDOR_ID_WISEGROUP_LTD2, USB_DEVICE_ID_SMARTJOY_DUAL_PLUS, HID_QUIRK_NOGET | HID_QUIRK_MULTI_INPUT },
  
  	{ USB_VENDOR_ID_PI_ENGINEERING, USB_DEVICE_ID_PI_ENGINEERING_VEC_USB_FOOTPEDAL, HID_QUIRK_HIDINPUT_FORCE },
  
  	{ USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_MULTI_TOUCH, HID_QUIRK_MULTI_INPUT },
  	{ USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_WIRELESS, HID_QUIRK_MULTI_INPUT },
  	{ USB_VENDOR_ID_SIGMA_MICRO, USB_DEVICE_ID_SIGMA_MICRO_KEYBOARD, HID_QUIRK_NO_INIT_REPORTS },
  	{ USB_VENDOR_ID_KYE, USB_DEVICE_ID_KYE_MOUSEPEN_I608X, HID_QUIRK_MULTI_INPUT },
  	{ USB_VENDOR_ID_KYE, USB_DEVICE_ID_KYE_MOUSEPEN_I608X_2, HID_QUIRK_MULTI_INPUT },
  	{ USB_VENDOR_ID_KYE, USB_DEVICE_ID_KYE_EASYPEN_M610X, HID_QUIRK_MULTI_INPUT },
  	{ USB_VENDOR_ID_NTRIG, USB_DEVICE_ID_NTRIG_DUOSENSE, HID_QUIRK_NO_INIT_REPORTS },
  	{ USB_VENDOR_ID_SEMICO, USB_DEVICE_ID_SEMICO_USB_KEYKOARD, HID_QUIRK_NO_INIT_REPORTS },
  	{ USB_VENDOR_ID_SYNAPTICS, USB_DEVICE_ID_SYNAPTICS_LTS1, HID_QUIRK_NO_INIT_REPORTS },
  	{ USB_VENDOR_ID_SYNAPTICS, USB_DEVICE_ID_SYNAPTICS_LTS2, HID_QUIRK_NO_INIT_REPORTS },
  	{ USB_VENDOR_ID_SYNAPTICS, USB_DEVICE_ID_SYNAPTICS_HD, HID_QUIRK_NO_INIT_REPORTS },
  	{ USB_VENDOR_ID_SYNAPTICS, USB_DEVICE_ID_SYNAPTICS_QUAD_HD, HID_QUIRK_NO_INIT_REPORTS },
  	{ USB_VENDOR_ID_SYNAPTICS, USB_DEVICE_ID_SYNAPTICS_TP_V103, HID_QUIRK_NO_INIT_REPORTS },
  	{ USB_VENDOR_ID_HOLTEK_ALT, USB_DEVICE_ID_HOLTEK_ALT_KEYBOARD_A096, HID_QUIRK_NO_INIT_INPUT_REPORTS },
  
  	{ 0, 0 }
  };
  
  /* Dynamic HID quirks list - specified at runtime */
  struct quirks_list_struct {
  	struct hid_blacklist hid_bl_item;
  	struct list_head node;
  };
  
  static LIST_HEAD(dquirks_list);
  static DECLARE_RWSEM(dquirks_rwsem);
  
  /* Runtime ("dynamic") quirks manipulation functions */
  
  /**
   * usbhid_exists_dquirk: find any dynamic quirks for a USB HID device
   * @idVendor: the 16-bit USB vendor ID, in native byteorder
   * @idProduct: the 16-bit USB product ID, in native byteorder
   *
   * Description:
   *         Scans dquirks_list for a matching dynamic quirk and returns
   *         the pointer to the relevant struct hid_blacklist if found.
   *         Must be called with a read lock held on dquirks_rwsem.
   *
   * Returns: NULL if no quirk found, struct hid_blacklist * if found.
   */
  static struct hid_blacklist *usbhid_exists_dquirk(const u16 idVendor,
  		const u16 idProduct)
  {
  	struct quirks_list_struct *q;
  	struct hid_blacklist *bl_entry = NULL;
  
  	list_for_each_entry(q, &dquirks_list, node) {
  		if (q->hid_bl_item.idVendor == idVendor &&
  				q->hid_bl_item.idProduct == idProduct) {
  			bl_entry = &q->hid_bl_item;
  			break;
  		}
  	}
  
  	if (bl_entry != NULL)
  		dbg_hid("Found dynamic quirk 0x%x for USB HID vendor 0x%hx prod 0x%hx\n",
  				bl_entry->quirks, bl_entry->idVendor,
  				bl_entry->idProduct);
  
  	return bl_entry;
  }
  
  
  /**
   * usbhid_modify_dquirk: add/replace a HID quirk
   * @idVendor: the 16-bit USB vendor ID, in native byteorder
   * @idProduct: the 16-bit USB product ID, in native byteorder
   * @quirks: the u32 quirks value to add/replace
   *
   * Description:
   *         If an dynamic quirk exists in memory for this (idVendor,
   *         idProduct) pair, replace its quirks value with what was
   *         provided.  Otherwise, add the quirk to the dynamic quirks list.
   *
   * Returns: 0 OK, -error on failure.
   */
  static int usbhid_modify_dquirk(const u16 idVendor, const u16 idProduct,
  				const u32 quirks)
  {
  	struct quirks_list_struct *q_new, *q;
  	int list_edited = 0;
  
  	if (!idVendor) {
  		dbg_hid("Cannot add a quirk with idVendor = 0\n");
  		return -EINVAL;
  	}
  
  	q_new = kmalloc(sizeof(struct quirks_list_struct), GFP_KERNEL);
  	if (!q_new) {
  		dbg_hid("Could not allocate quirks_list_struct\n");
  		return -ENOMEM;
  	}
  
  	q_new->hid_bl_item.idVendor = idVendor;
  	q_new->hid_bl_item.idProduct = idProduct;
  	q_new->hid_bl_item.quirks = quirks;
  
  	down_write(&dquirks_rwsem);
  
  	list_for_each_entry(q, &dquirks_list, node) {
  
  		if (q->hid_bl_item.idVendor == idVendor &&
  				q->hid_bl_item.idProduct == idProduct) {
  
  			list_replace(&q->node, &q_new->node);
  			kfree(q);
  			list_edited = 1;
  			break;
  
  		}
  
  	}
  
  	if (!list_edited)
  		list_add_tail(&q_new->node, &dquirks_list);
  
  	up_write(&dquirks_rwsem);
  
  	return 0;
  }
  
  /**
   * usbhid_remove_all_dquirks: remove all runtime HID quirks from memory
   *
   * Description:
   *         Free all memory associated with dynamic quirks - called before
   *         module unload.
   *
   */
  static void usbhid_remove_all_dquirks(void)
  {
  	struct quirks_list_struct *q, *temp;
  
  	down_write(&dquirks_rwsem);
  	list_for_each_entry_safe(q, temp, &dquirks_list, node) {
  		list_del(&q->node);
  		kfree(q);
  	}
  	up_write(&dquirks_rwsem);
  
  }
  
  /** 
   * usbhid_quirks_init: apply USB HID quirks specified at module load time
   */
  int usbhid_quirks_init(char **quirks_param)
  {
  	u16 idVendor, idProduct;
  	u32 quirks;
  	int n = 0, m;
  
  	for (; n < MAX_USBHID_BOOT_QUIRKS && quirks_param[n]; n++) {
  
  		m = sscanf(quirks_param[n], "0x%hx:0x%hx:0x%x",
  				&idVendor, &idProduct, &quirks);
  
  		if (m != 3 ||
  				usbhid_modify_dquirk(idVendor, idProduct, quirks) != 0) {
  			printk(KERN_WARNING
  					"Could not parse HID quirk module param %s\n",
  					quirks_param[n]);
  		}
  	}
  
  	return 0;
  }
  
  /**
   * usbhid_quirks_exit: release memory associated with dynamic_quirks
   *
   * Description:
   *     Release all memory associated with dynamic quirks.  Called upon
   *     module unload.
   *
   * Returns: nothing
   */
  void usbhid_quirks_exit(void)
  {
  	usbhid_remove_all_dquirks();
  }
  
  /**
   * usbhid_exists_squirk: return any static quirks for a USB HID device
   * @idVendor: the 16-bit USB vendor ID, in native byteorder
   * @idProduct: the 16-bit USB product ID, in native byteorder
   *
   * Description:
   *     Given a USB vendor ID and product ID, return a pointer to
   *     the hid_blacklist entry associated with that device.
   *
   * Returns: pointer if quirk found, or NULL if no quirks found.
   */
  static const struct hid_blacklist *usbhid_exists_squirk(const u16 idVendor,
  		const u16 idProduct)
  {
  	const struct hid_blacklist *bl_entry = NULL;
  	int n = 0;
  
  	for (; hid_blacklist[n].idVendor; n++)
  		if (hid_blacklist[n].idVendor == idVendor &&
  				hid_blacklist[n].idProduct == idProduct)
  			bl_entry = &hid_blacklist[n];
  
  	if (bl_entry != NULL)
  		dbg_hid("Found squirk 0x%x for USB HID vendor 0x%hx prod 0x%hx\n",
  				bl_entry->quirks, bl_entry->idVendor, 
  				bl_entry->idProduct);
  	return bl_entry;
  }
  
  /**
   * usbhid_lookup_quirk: return any quirks associated with a USB HID device
   * @idVendor: the 16-bit USB vendor ID, in native byteorder
   * @idProduct: the 16-bit USB product ID, in native byteorder
   *
   * Description:
   *     Given a USB vendor ID and product ID, return any quirks associated
   *     with that device.
   *
   * Returns: a u32 quirks value.
   */
  u32 usbhid_lookup_quirk(const u16 idVendor, const u16 idProduct)
  {
  	u32 quirks = 0;
  	const struct hid_blacklist *bl_entry = NULL;
  
  	/* NCR devices must not be queried for reports */
  	if (idVendor == USB_VENDOR_ID_NCR &&
  			idProduct >= USB_DEVICE_ID_NCR_FIRST &&
  			idProduct <= USB_DEVICE_ID_NCR_LAST)
  			return HID_QUIRK_NO_INIT_REPORTS;
  
  	down_read(&dquirks_rwsem);
  	bl_entry = usbhid_exists_dquirk(idVendor, idProduct);
  	if (!bl_entry)
  		bl_entry = usbhid_exists_squirk(idVendor, idProduct);
  	if (bl_entry)
  		quirks = bl_entry->quirks;
  	up_read(&dquirks_rwsem);
  
  	return quirks;
  }
  
  EXPORT_SYMBOL_GPL(usbhid_lookup_quirk);
  