drivers/hid/usbhid/hid-quirks.c - kernel/bruno - Git at Google

 /*
  *  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_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_ATEN, USB_DEVICE_ID_ATEN_CS682, HID_QUIRK_NOGET },
 	{ USB_VENDOR_ID_ATEN, USB_DEVICE_ID_ATEN_CS692, 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_CHICONY, USB_DEVICE_ID_CHICONY_PIXART_USB_OPTICAL_MOUSE, HID_QUIRK_ALWAYS_POLL },
 	{ USB_VENDOR_ID_CREATIVELABS, USB_DEVICE_ID_CREATIVE_SB_OMNI_SURROUND_51, HID_QUIRK_NOGET },
 	{ USB_VENDOR_ID_DMI, USB_DEVICE_ID_DMI_ENC, HID_QUIRK_NOGET },
 	{ USB_VENDOR_ID_DRAGONRISE, USB_DEVICE_ID_DRAGONRISE_WIIU, HID_QUIRK_MULTI_INPUT },
 	{ USB_VENDOR_ID_ELAN, HID_ANY_ID, 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_HP, USB_PRODUCT_ID_HP_LOGITECH_OEM_USB_OPTICAL_MOUSE_0A4A, HID_QUIRK_ALWAYS_POLL },
 	{ USB_VENDOR_ID_HP, USB_PRODUCT_ID_HP_LOGITECH_OEM_USB_OPTICAL_MOUSE_0B4A, HID_QUIRK_ALWAYS_POLL },
 	{ USB_VENDOR_ID_HP, USB_PRODUCT_ID_HP_PIXART_OEM_USB_OPTICAL_MOUSE, HID_QUIRK_ALWAYS_POLL },
 	{ USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_C077, HID_QUIRK_ALWAYS_POLL },
 	{ USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_KEYBOARD_G710_PLUS, HID_QUIRK_NOGET },
 	{ USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_MOUSE_C01A, HID_QUIRK_ALWAYS_POLL },
 	{ USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_MOUSE_C05A, HID_QUIRK_ALWAYS_POLL },
 	{ USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_MOUSE_C06A, HID_QUIRK_ALWAYS_POLL },
 	{ USB_VENDOR_ID_MGE, USB_DEVICE_ID_MGE_UPS, HID_QUIRK_NOGET },
 	{ USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_SURFACE_PRO_2, HID_QUIRK_NO_INIT_REPORTS },
 	{ USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_TYPE_COVER_2, HID_QUIRK_NO_INIT_REPORTS },
 	{ USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_TOUCH_COVER_2, HID_QUIRK_NO_INIT_REPORTS },
 	{ USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_TYPE_COVER_PRO_3, HID_QUIRK_NO_INIT_REPORTS },
 	{ USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_TYPE_COVER_PRO_3_2, HID_QUIRK_NO_INIT_REPORTS },
 	{ USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_TYPE_COVER_PRO_3_JP, HID_QUIRK_NO_INIT_REPORTS },
 	{ USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_TYPE_COVER_3, HID_QUIRK_NO_INIT_REPORTS },
 	{ USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_POWER_COVER, 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_PRIMAX, USB_DEVICE_ID_PRIMAX_MOUSE_4D22, HID_QUIRK_ALWAYS_POLL },
 	{ 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_8882, HID_QUIRK_NOGET },
 	{ USB_VENDOR_ID_TPV, USB_DEVICE_ID_TPV_OPTICAL_TOUCHSCREEN_8883, HID_QUIRK_NOGET },
 	{ USB_VENDOR_ID_TURBOX, USB_DEVICE_ID_TURBOX_KEYBOARD, HID_QUIRK_NOGET },
 	{ 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_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_KYE, USB_DEVICE_ID_KYE_PENSKETCH_M912, 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 },
 	{ USB_VENDOR_ID_MULTIPLE_1781, USB_DEVICE_ID_RAPHNET_4NES4SNES_OLD, HID_QUIRK_MULTI_INPUT },
 	{ USB_VENDOR_ID_DRACAL_RAPHNET, USB_DEVICE_ID_RAPHNET_2NES2SNES, HID_QUIRK_MULTI_INPUT },
 	{ USB_VENDOR_ID_DRACAL_RAPHNET, USB_DEVICE_ID_RAPHNET_4NES4SNES, HID_QUIRK_MULTI_INPUT },

 	{ 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 == (__u16) HID_ANY_ID ||
 				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);
	/*
	* 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_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_ATEN, USB_DEVICE_ID_ATEN_CS682, HID_QUIRK_NOGET },
	{ USB_VENDOR_ID_ATEN, USB_DEVICE_ID_ATEN_CS692, 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_CHICONY, USB_DEVICE_ID_CHICONY_PIXART_USB_OPTICAL_MOUSE, HID_QUIRK_ALWAYS_POLL },
	{ USB_VENDOR_ID_CREATIVELABS, USB_DEVICE_ID_CREATIVE_SB_OMNI_SURROUND_51, HID_QUIRK_NOGET },
	{ USB_VENDOR_ID_DMI, USB_DEVICE_ID_DMI_ENC, HID_QUIRK_NOGET },
	{ USB_VENDOR_ID_DRAGONRISE, USB_DEVICE_ID_DRAGONRISE_WIIU, HID_QUIRK_MULTI_INPUT },
	{ USB_VENDOR_ID_ELAN, HID_ANY_ID, 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_HP, USB_PRODUCT_ID_HP_LOGITECH_OEM_USB_OPTICAL_MOUSE_0A4A, HID_QUIRK_ALWAYS_POLL },
	{ USB_VENDOR_ID_HP, USB_PRODUCT_ID_HP_LOGITECH_OEM_USB_OPTICAL_MOUSE_0B4A, HID_QUIRK_ALWAYS_POLL },
	{ USB_VENDOR_ID_HP, USB_PRODUCT_ID_HP_PIXART_OEM_USB_OPTICAL_MOUSE, HID_QUIRK_ALWAYS_POLL },
	{ USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_C077, HID_QUIRK_ALWAYS_POLL },
	{ USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_KEYBOARD_G710_PLUS, HID_QUIRK_NOGET },
	{ USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_MOUSE_C01A, HID_QUIRK_ALWAYS_POLL },
	{ USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_MOUSE_C05A, HID_QUIRK_ALWAYS_POLL },
	{ USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_MOUSE_C06A, HID_QUIRK_ALWAYS_POLL },
	{ USB_VENDOR_ID_MGE, USB_DEVICE_ID_MGE_UPS, HID_QUIRK_NOGET },
	{ USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_SURFACE_PRO_2, HID_QUIRK_NO_INIT_REPORTS },
	{ USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_TYPE_COVER_2, HID_QUIRK_NO_INIT_REPORTS },
	{ USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_TOUCH_COVER_2, HID_QUIRK_NO_INIT_REPORTS },
	{ USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_TYPE_COVER_PRO_3, HID_QUIRK_NO_INIT_REPORTS },
	{ USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_TYPE_COVER_PRO_3_2, HID_QUIRK_NO_INIT_REPORTS },
	{ USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_TYPE_COVER_PRO_3_JP, HID_QUIRK_NO_INIT_REPORTS },
	{ USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_TYPE_COVER_3, HID_QUIRK_NO_INIT_REPORTS },
	{ USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_POWER_COVER, 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_PRIMAX, USB_DEVICE_ID_PRIMAX_MOUSE_4D22, HID_QUIRK_ALWAYS_POLL },
	{ 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_8882, HID_QUIRK_NOGET },
	{ USB_VENDOR_ID_TPV, USB_DEVICE_ID_TPV_OPTICAL_TOUCHSCREEN_8883, HID_QUIRK_NOGET },
	{ USB_VENDOR_ID_TURBOX, USB_DEVICE_ID_TURBOX_KEYBOARD, HID_QUIRK_NOGET },
	{ 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_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_KYE, USB_DEVICE_ID_KYE_PENSKETCH_M912, 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 },
	{ USB_VENDOR_ID_MULTIPLE_1781, USB_DEVICE_ID_RAPHNET_4NES4SNES_OLD, HID_QUIRK_MULTI_INPUT },
	{ USB_VENDOR_ID_DRACAL_RAPHNET, USB_DEVICE_ID_RAPHNET_2NES2SNES, HID_QUIRK_MULTI_INPUT },
	{ USB_VENDOR_ID_DRACAL_RAPHNET, USB_DEVICE_ID_RAPHNET_4NES4SNES, HID_QUIRK_MULTI_INPUT },

	{ 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 == (__u16) HID_ANY_ID \|\|
	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);