include/linux/hid.h

/*
 *  Copyright (c) 1999 Andreas Gal
 *  Copyright (c) 2000-2001 Vojtech Pavlik
 *  Copyright (c) 2006-2007 Jiri Kosina
 */
/*
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Should you need to contact me, the author, you can do so either by
 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
 */
#ifndef __HID_H
#define __HID_H


#include <linux/types.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/mod_devicetable.h> /* hid_device_id */
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <linux/input.h>
#include <linux/semaphore.h>
#include <linux/power_supply.h>
#include <uapi/linux/hid.h>

/*
 * We parse each description item into this structure. Short items data
 * values are expanded to 32-bit signed int, long items contain a pointer
 * into the data area.
 */

struct hid_item {
	unsigned  format;
	__u8      size;
	__u8      type;
	__u8      tag;
	union {
	    __u8   u8;
	    __s8   s8;
	    __u16  u16;
	    __s16  s16;
	    __u32  u32;
	    __s32  s32;
	    __u8  *longdata;
	} data;
};

/*
 * HID report item format
 */

#define HID_ITEM_FORMAT_SHORT	0
#define HID_ITEM_FORMAT_LONG	1

/*
 * Special tag indicating long items
 */

#define HID_ITEM_TAG_LONG	15

/*
 * HID report descriptor item type (prefix bit 2,3)
 */

#define HID_ITEM_TYPE_MAIN		0
#define HID_ITEM_TYPE_GLOBAL		1
#define HID_ITEM_TYPE_LOCAL		2
#define HID_ITEM_TYPE_RESERVED		3

/*
 * HID report descriptor main item tags
 */

#define HID_MAIN_ITEM_TAG_INPUT			8
#define HID_MAIN_ITEM_TAG_OUTPUT		9
#define HID_MAIN_ITEM_TAG_FEATURE		11
#define HID_MAIN_ITEM_TAG_BEGIN_COLLECTION	10
#define HID_MAIN_ITEM_TAG_END_COLLECTION	12

/*
 * HID report descriptor main item contents
 */

#define HID_MAIN_ITEM_CONSTANT		0x001
#define HID_MAIN_ITEM_VARIABLE		0x002
#define HID_MAIN_ITEM_RELATIVE		0x004
#define HID_MAIN_ITEM_WRAP		0x008
#define HID_MAIN_ITEM_NONLINEAR		0x010
#define HID_MAIN_ITEM_NO_PREFERRED	0x020
#define HID_MAIN_ITEM_NULL_STATE	0x040
#define HID_MAIN_ITEM_VOLATILE		0x080
#define HID_MAIN_ITEM_BUFFERED_BYTE	0x100

/*
 * HID report descriptor collection item types
 */

#define HID_COLLECTION_PHYSICAL		0
#define HID_COLLECTION_APPLICATION	1
#define HID_COLLECTION_LOGICAL		2

/*
 * HID report descriptor global item tags
 */

#define HID_GLOBAL_ITEM_TAG_USAGE_PAGE		0
#define HID_GLOBAL_ITEM_TAG_LOGICAL_MINIMUM	1
#define HID_GLOBAL_ITEM_TAG_LOGICAL_MAXIMUM	2
#define HID_GLOBAL_ITEM_TAG_PHYSICAL_MINIMUM	3
#define HID_GLOBAL_ITEM_TAG_PHYSICAL_MAXIMUM	4
#define HID_GLOBAL_ITEM_TAG_UNIT_EXPONENT	5
#define HID_GLOBAL_ITEM_TAG_UNIT		6
#define HID_GLOBAL_ITEM_TAG_REPORT_SIZE		7
#define HID_GLOBAL_ITEM_TAG_REPORT_ID		8
#define HID_GLOBAL_ITEM_TAG_REPORT_COUNT	9
#define HID_GLOBAL_ITEM_TAG_PUSH		10
#define HID_GLOBAL_ITEM_TAG_POP			11

/*
 * HID report descriptor local item tags
 */

#define HID_LOCAL_ITEM_TAG_USAGE		0
#define HID_LOCAL_ITEM_TAG_USAGE_MINIMUM	1
#define HID_LOCAL_ITEM_TAG_USAGE_MAXIMUM	2
#define HID_LOCAL_ITEM_TAG_DESIGNATOR_INDEX	3
#define HID_LOCAL_ITEM_TAG_DESIGNATOR_MINIMUM	4
#define HID_LOCAL_ITEM_TAG_DESIGNATOR_MAXIMUM	5
#define HID_LOCAL_ITEM_TAG_STRING_INDEX		7
#define HID_LOCAL_ITEM_TAG_STRING_MINIMUM	8
#define HID_LOCAL_ITEM_TAG_STRING_MAXIMUM	9
#define HID_LOCAL_ITEM_TAG_DELIMITER		10

/*
 * HID usage tables
 */

#define HID_USAGE_PAGE		0xffff0000

#define HID_UP_UNDEFINED	0x00000000
#define HID_UP_GENDESK		0x00010000
#define HID_UP_SIMULATION	0x00020000
#define HID_UP_GENDEVCTRLS	0x00060000
#define HID_UP_KEYBOARD		0x00070000
#define HID_UP_LED		0x00080000
#define HID_UP_BUTTON		0x00090000
#define HID_UP_ORDINAL		0x000a0000
#define HID_UP_CONSUMER		0x000c0000
#define HID_UP_DIGITIZER	0x000d0000
#define HID_UP_PID		0x000f0000
#define HID_UP_HPVENDOR         0xff7f0000
#define HID_UP_HPVENDOR2        0xff010000
#define HID_UP_MSVENDOR		0xff000000
#define HID_UP_CUSTOM		0x00ff0000
#define HID_UP_LOGIVENDOR	0xffbc0000
#define HID_UP_SENSOR		0x00200000

#define HID_USAGE		0x0000ffff

#define HID_GD_POINTER		0x00010001
#define HID_GD_MOUSE		0x00010002
#define HID_GD_JOYSTICK		0x00010004
#define HID_GD_GAMEPAD		0x00010005
#define HID_GD_KEYBOARD		0x00010006
#define HID_GD_KEYPAD		0x00010007
#define HID_GD_MULTIAXIS	0x00010008
#define HID_GD_X		0x00010030
#define HID_GD_Y		0x00010031
#define HID_GD_Z		0x00010032
#define HID_GD_RX		0x00010033
#define HID_GD_RY		0x00010034
#define HID_GD_RZ		0x00010035
#define HID_GD_SLIDER		0x00010036
#define HID_GD_DIAL		0x00010037
#define HID_GD_WHEEL		0x00010038
#define HID_GD_HATSWITCH	0x00010039
#define HID_GD_BUFFER		0x0001003a
#define HID_GD_BYTECOUNT	0x0001003b
#define HID_GD_MOTION		0x0001003c
#define HID_GD_START		0x0001003d
#define HID_GD_SELECT		0x0001003e
#define HID_GD_VX		0x00010040
#define HID_GD_VY		0x00010041
#define HID_GD_VZ		0x00010042
#define HID_GD_VBRX		0x00010043
#define HID_GD_VBRY		0x00010044
#define HID_GD_VBRZ		0x00010045
#define HID_GD_VNO		0x00010046
#define HID_GD_FEATURE		0x00010047
#define HID_GD_UP		0x00010090
#define HID_GD_DOWN		0x00010091
#define HID_GD_RIGHT		0x00010092
#define HID_GD_LEFT		0x00010093

#define HID_DC_BATTERYSTRENGTH	0x00060020

#define HID_DG_DIGITIZER	0x000d0001
#define HID_DG_PEN		0x000d0002
#define HID_DG_LIGHTPEN		0x000d0003
#define HID_DG_TOUCHSCREEN	0x000d0004
#define HID_DG_TOUCHPAD		0x000d0005
#define HID_DG_STYLUS		0x000d0020
#define HID_DG_PUCK		0x000d0021
#define HID_DG_FINGER		0x000d0022
#define HID_DG_TIPPRESSURE	0x000d0030
#define HID_DG_BARRELPRESSURE	0x000d0031
#define HID_DG_INRANGE		0x000d0032
#define HID_DG_TOUCH		0x000d0033
#define HID_DG_UNTOUCH		0x000d0034
#define HID_DG_TAP		0x000d0035
#define HID_DG_TABLETFUNCTIONKEY	0x000d0039
#define HID_DG_PROGRAMCHANGEKEY	0x000d003a
#define HID_DG_INVERT		0x000d003c
#define HID_DG_TIPSWITCH	0x000d0042
#define HID_DG_TIPSWITCH2	0x000d0043
#define HID_DG_BARRELSWITCH	0x000d0044
#define HID_DG_ERASER		0x000d0045
#define HID_DG_TABLETPICK	0x000d0046
/*
 * as of May 20, 2009 the usages below are not yet in the official USB spec
 * but are being pushed by Microsft as described in their paper "Digitizer
 * Drivers for Windows Touch and Pen-Based Computers"
 */
#define HID_DG_CONFIDENCE	0x000d0047
#define HID_DG_WIDTH		0x000d0048
#define HID_DG_HEIGHT		0x000d0049
#define HID_DG_CONTACTID	0x000d0051
#define HID_DG_INPUTMODE	0x000d0052
#define HID_DG_DEVICEINDEX	0x000d0053
#define HID_DG_CONTACTCOUNT	0x000d0054
#define HID_DG_CONTACTMAX	0x000d0055

/*
 * HID report types --- Ouch! HID spec says 1 2 3!
 */

#define HID_INPUT_REPORT	0
#define HID_OUTPUT_REPORT	1
#define HID_FEATURE_REPORT	2

/*
 * HID connect requests
 */

#define HID_CONNECT_HIDINPUT		0x01
#define HID_CONNECT_HIDINPUT_FORCE	0x02
#define HID_CONNECT_HIDRAW		0x04
#define HID_CONNECT_HIDDEV		0x08
#define HID_CONNECT_HIDDEV_FORCE	0x10
#define HID_CONNECT_FF			0x20
#define HID_CONNECT_DEFAULT	(HID_CONNECT_HIDINPUT|HID_CONNECT_HIDRAW| \
		HID_CONNECT_HIDDEV|HID_CONNECT_FF)

/*
 * HID device quirks.
 */

/* 
 * Increase this if you need to configure more HID quirks at module load time
 */
#define MAX_USBHID_BOOT_QUIRKS 4

#define HID_QUIRK_INVERT			0x00000001
#define HID_QUIRK_NOTOUCH			0x00000002
#define HID_QUIRK_IGNORE			0x00000004
#define HID_QUIRK_NOGET				0x00000008
#define HID_QUIRK_HIDDEV_FORCE			0x00000010
#define HID_QUIRK_BADPAD			0x00000020
#define HID_QUIRK_MULTI_INPUT			0x00000040
#define HID_QUIRK_HIDINPUT_FORCE		0x00000080
#define HID_QUIRK_SKIP_OUTPUT_REPORTS		0x00010000
#define HID_QUIRK_FULLSPEED_INTERVAL		0x10000000
#define HID_QUIRK_NO_INIT_REPORTS		0x20000000
#define HID_QUIRK_NO_IGNORE			0x40000000
#define HID_QUIRK_NO_INPUT_SYNC			0x80000000

/*
 * HID device groups
 */
#define HID_GROUP_GENERIC			0x0001
#define HID_GROUP_MULTITOUCH			0x0002
#define HID_GROUP_SENSOR_HUB			0x0003

/*
 * This is the global environment of the parser. This information is
 * persistent for main-items. The global environment can be saved and
 * restored with PUSH/POP statements.
 */

struct hid_global {
	unsigned usage_page;
	__s32    logical_minimum;
	__s32    logical_maximum;
	__s32    physical_minimum;
	__s32    physical_maximum;
	__s32    unit_exponent;
	unsigned unit;
	unsigned report_id;
	unsigned report_size;
	unsigned report_count;
};

/*
 * This is the local environment. It is persistent up the next main-item.
 */

#define HID_MAX_USAGES			12288
#define HID_DEFAULT_NUM_COLLECTIONS	16

struct hid_local {
	unsigned usage[HID_MAX_USAGES]; /* usage array */
	unsigned collection_index[HID_MAX_USAGES]; /* collection index array */
	unsigned usage_index;
	unsigned usage_minimum;
	unsigned delimiter_depth;
	unsigned delimiter_branch;
};

/*
 * This is the collection stack. We climb up the stack to determine
 * application and function of each field.
 */

struct hid_collection {
	unsigned type;
	unsigned usage;
	unsigned level;
};

struct hid_usage {
	unsigned  hid;			/* hid usage code */
	unsigned  collection_index;	/* index into collection array */
	unsigned  usage_index;		/* index into usage array */
	/* hidinput data */
	__u16     code;			/* input driver code */
	__u8      type;			/* input driver type */
	__s8	  hat_min;		/* hat switch fun */
	__s8	  hat_max;		/* ditto */
	__s8	  hat_dir;		/* ditto */
};

struct hid_input;

struct hid_field {
	unsigned  physical;		/* physical usage for this field */
	unsigned  logical;		/* logical usage for this field */
	unsigned  application;		/* application usage for this field */
	struct hid_usage *usage;	/* usage table for this function */
	unsigned  maxusage;		/* maximum usage index */
	unsigned  flags;		/* main-item flags (i.e. volatile,array,constant) */
	unsigned  report_offset;	/* bit offset in the report */
	unsigned  report_size;		/* size of this field in the report */
	unsigned  report_count;		/* number of this field in the report */
	unsigned  report_type;		/* (input,output,feature) */
	__s32    *value;		/* last known value(s) */
	__s32     logical_minimum;
	__s32     logical_maximum;
	__s32     physical_minimum;
	__s32     physical_maximum;
	__s32     unit_exponent;
	unsigned  unit;
	struct hid_report *report;	/* associated report */
	unsigned index;			/* index into report->field[] */
	/* hidinput data */
	struct hid_input *hidinput;	/* associated input structure */
	__u16 dpad;			/* dpad input code */
};

#define HID_MAX_FIELDS 256

struct hid_report {
	struct list_head list;
	unsigned id;					/* id of this report */
	unsigned type;					/* report type */
	struct hid_field *field[HID_MAX_FIELDS];	/* fields of the report */
	unsigned maxfield;				/* maximum valid field index */
	unsigned size;					/* size of the report (bits) */
	struct hid_device *device;			/* associated device */
};

struct hid_report_enum {
	unsigned numbered;
	struct list_head report_list;
	struct hid_report *report_id_hash[256];
};

#define HID_REPORT_TYPES 3

#define HID_MIN_BUFFER_SIZE	64		/* make sure there is at least a packet size of space */
#define HID_MAX_BUFFER_SIZE	4096		/* 4kb */
#define HID_CONTROL_FIFO_SIZE	256		/* to init devices with >100 reports */
#define HID_OUTPUT_FIFO_SIZE	64

struct hid_control_fifo {
	unsigned char dir;
	struct hid_report *report;
	char *raw_report;
};

struct hid_output_fifo {
	struct hid_report *report;
	char *raw_report;
};

#define HID_CLAIMED_INPUT	1
#define HID_CLAIMED_HIDDEV	2
#define HID_CLAIMED_HIDRAW	4

#define HID_STAT_ADDED		1
#define HID_STAT_PARSED		2

struct hid_input {
	struct list_head list;
	struct hid_report *report;
	struct input_dev *input;
};

enum hid_type {
	HID_TYPE_OTHER = 0,
	HID_TYPE_USBMOUSE,
	HID_TYPE_USBNONE
};

struct hid_driver;
struct hid_ll_driver;

struct hid_device {							/* device report descriptor */
	__u8 *dev_rdesc;
	unsigned dev_rsize;
	__u8 *rdesc;
	unsigned rsize;
	struct hid_collection *collection;				/* List of HID collections */
	unsigned collection_size;					/* Number of allocated hid_collections */
	unsigned maxcollection;						/* Number of parsed collections */
	unsigned maxapplication;					/* Number of applications */
	__u16 bus;							/* BUS ID */
	__u16 group;							/* Report group */
	__u32 vendor;							/* Vendor ID */
	__u32 product;							/* Product ID */
	__u32 version;							/* HID version */
	enum hid_type type;						/* device type (mouse, kbd, ...) */
	unsigned country;						/* HID country */
	struct hid_report_enum report_enum[HID_REPORT_TYPES];

	struct semaphore driver_lock;					/* protects the current driver */
	struct device dev;						/* device */
	struct hid_driver *driver;
	struct hid_ll_driver *ll_driver;

#ifdef CONFIG_HID_BATTERY_STRENGTH
	/*
	 * Power supply information for HID devices which report
	 * battery strength. power_supply is registered iff
	 * battery.name is non-NULL.
	 */
	struct power_supply battery;
	__s32 battery_min;
	__s32 battery_max;
	__s32 battery_report_type;
	__s32 battery_report_id;
#endif

	unsigned int status;						/* see STAT flags above */
	unsigned claimed;						/* Claimed by hidinput, hiddev? */
	unsigned quirks;						/* Various quirks the device can pull on us */

	struct list_head inputs;					/* The list of inputs */
	void *hiddev;							/* The hiddev structure */
	void *hidraw;
	int minor;							/* Hiddev minor number */

	int open;							/* is the device open by anyone? */
	char name[128];							/* Device name */
	char phys[64];							/* Device physical location */
	char uniq[64];							/* Device unique identifier (serial #) */

	void *driver_data;

	/* temporary hid_ff handling (until moved to the drivers) */
	int (*ff_init)(struct hid_device *);

	/* hiddev event handler */
	int (*hiddev_connect)(struct hid_device *, unsigned int);
	void (*hiddev_disconnect)(struct hid_device *);
	void (*hiddev_hid_event) (struct hid_device *, struct hid_field *field,
				  struct hid_usage *, __s32);
	void (*hiddev_report_event) (struct hid_device *, struct hid_report *);

	/* handler for raw input (Get_Report) data, used by hidraw */
	int (*hid_get_raw_report) (struct hid_device *, unsigned char, __u8 *, size_t, unsigned char);

	/* handler for raw output data, used by hidraw */
	int (*hid_output_raw_report) (struct hid_device *, __u8 *, size_t, unsigned char);

	/* debugging support via debugfs */
	unsigned short debug;
	struct dentry *debug_dir;
	struct dentry *debug_rdesc;
	struct dentry *debug_events;
	struct list_head debug_list;
	wait_queue_head_t debug_wait;
};

static inline void *hid_get_drvdata(struct hid_device *hdev)
{
	return dev_get_drvdata(&hdev->dev);
}

static inline void hid_set_drvdata(struct hid_device *hdev, void *data)
{
	dev_set_drvdata(&hdev->dev, data);
}

#define HID_GLOBAL_STACK_SIZE 4
#define HID_COLLECTION_STACK_SIZE 4

struct hid_parser {
	struct hid_global     global;
	struct hid_global     global_stack[HID_GLOBAL_STACK_SIZE];
	unsigned              global_stack_ptr;
	struct hid_local      local;
	unsigned              collection_stack[HID_COLLECTION_STACK_SIZE];
	unsigned              collection_stack_ptr;
	struct hid_device    *device;
};

struct hid_class_descriptor {
	__u8  bDescriptorType;
	__le16 wDescriptorLength;
} __attribute__ ((packed));

struct hid_descriptor {
	__u8  bLength;
	__u8  bDescriptorType;
	__le16 bcdHID;
	__u8  bCountryCode;
	__u8  bNumDescriptors;

	struct hid_class_descriptor desc[1];
} __attribute__ ((packed));

#define HID_DEVICE(b, g, ven, prod)					\
	.bus = (b), .group = (g), .vendor = (ven), .product = (prod)
#define HID_USB_DEVICE(ven, prod)				\
	.bus = BUS_USB, .vendor = (ven), .product = (prod)
#define HID_BLUETOOTH_DEVICE(ven, prod)					\
	.bus = BUS_BLUETOOTH, .vendor = (ven), .product = (prod)

#define HID_REPORT_ID(rep) \
	.report_type = (rep)
#define HID_USAGE_ID(uhid, utype, ucode) \
	.usage_hid = (uhid), .usage_type = (utype), .usage_code = (ucode)
/* we don't want to catch types and codes equal to 0 */
#define HID_TERMINATOR		(HID_ANY_ID - 1)

struct hid_report_id {
	__u32 report_type;
};
struct hid_usage_id {
	__u32 usage_hid;
	__u32 usage_type;
	__u32 usage_code;
};

/**
 * struct hid_driver
 * @name: driver name (e.g. "Footech_bar-wheel")
 * @id_table: which devices is this driver for (must be non-NULL for probe
 * 	      to be called)
 * @dyn_list: list of dynamically added device ids
 * @dyn_lock: lock protecting @dyn_list
 * @probe: new device inserted
 * @remove: device removed (NULL if not a hot-plug capable driver)
 * @report_table: on which reports to call raw_event (NULL means all)
 * @raw_event: if report in report_table, this hook is called (NULL means nop)
 * @usage_table: on which events to call event (NULL means all)
 * @event: if usage in usage_table, this hook is called (NULL means nop)
 * @report: this hook is called after parsing a report (NULL means nop)
 * @report_fixup: called before report descriptor parsing (NULL means nop)
 * @input_mapping: invoked on input registering before mapping an usage
 * @input_mapped: invoked on input registering after mapping an usage
 * @input_configured: invoked just before the device is registered
 * @feature_mapping: invoked on feature registering
 * @suspend: invoked on suspend (NULL means nop)
 * @resume: invoked on resume if device was not reset (NULL means nop)
 * @reset_resume: invoked on resume if device was reset (NULL means nop)
 *
 * raw_event and event should return 0 on no action performed, 1 when no
 * further processing should be done and negative on error
 *
 * input_mapping shall return a negative value to completely ignore this usage
 * (e.g. doubled or invalid usage), zero to continue with parsing of this
 * usage by generic code (no special handling needed) or positive to skip
 * generic parsing (needed special handling which was done in the hook already)
 * input_mapped shall return negative to inform the layer that this usage
 * should not be considered for further processing or zero to notify that
 * no processing was performed and should be done in a generic manner
 * Both these functions may be NULL which means the same behavior as returning
 * zero from them.
 */
struct hid_driver {
	char *name;
	const struct hid_device_id *id_table;

	struct list_head dyn_list;
	spinlock_t dyn_lock;

	int (*probe)(struct hid_device *dev, const struct hid_device_id *id);
	void (*remove)(struct hid_device *dev);

	const struct hid_report_id *report_table;
	int (*raw_event)(struct hid_device *hdev, struct hid_report *report,
			u8 *data, int size);
	const struct hid_usage_id *usage_table;
	int (*event)(struct hid_device *hdev, struct hid_field *field,
			struct hid_usage *usage, __s32 value);
	void (*report)(struct hid_device *hdev, struct hid_report *report);

	__u8 *(*report_fixup)(struct hid_device *hdev, __u8 *buf,
			unsigned int *size);

	int (*input_mapping)(struct hid_device *hdev,
			struct hid_input *hidinput, struct hid_field *field,
			struct hid_usage *usage, unsigned long **bit, int *max);
	int (*input_mapped)(struct hid_device *hdev,
			struct hid_input *hidinput, struct hid_field *field,
			struct hid_usage *usage, unsigned long **bit, int *max);
	void (*input_configured)(struct hid_device *hdev,
				 struct hid_input *hidinput);
	void (*feature_mapping)(struct hid_device *hdev,
			struct hid_field *field,
			struct hid_usage *usage);
#ifdef CONFIG_PM
	int (*suspend)(struct hid_device *hdev, pm_message_t message);
	int (*resume)(struct hid_device *hdev);
	int (*reset_resume)(struct hid_device *hdev);
#endif
/* private: */
	struct device_driver driver;
};

/**
 * hid_ll_driver - low level driver callbacks
 * @start: called on probe to start the device
 * @stop: called on remove
 * @open: called by input layer on open
 * @close: called by input layer on close
 * @hidinput_input_event: event input event (e.g. ff or leds)
 * @parse: this method is called only once to parse the device data,
 *	   shouldn't allocate anything to not leak memory
 */
struct hid_ll_driver {
	int (*start)(struct hid_device *hdev);
	void (*stop)(struct hid_device *hdev);

	int (*open)(struct hid_device *hdev);
	void (*close)(struct hid_device *hdev);

	int (*power)(struct hid_device *hdev, int level);

	int (*hidinput_input_event) (struct input_dev *idev, unsigned int type,
			unsigned int code, int value);

	int (*parse)(struct hid_device *hdev);
};

#define	PM_HINT_FULLON	1<<5
#define PM_HINT_NORMAL	1<<1

/* Applications from HID Usage Tables 4/8/99 Version 1.1 */
/* We ignore a few input applications that are not widely used */
#define IS_INPUT_APPLICATION(a) (((a >= 0x00010000) && (a <= 0x00010008)) || (a == 0x00010080) || (a == 0x000c0001) || ((a >= 0x000d0002) && (a <= 0x000d0006)))

/* HID core API */

extern int hid_debug;

extern bool hid_ignore(struct hid_device *);
extern int hid_add_device(struct hid_device *);
extern void hid_destroy_device(struct hid_device *);

extern int __must_check __hid_register_driver(struct hid_driver *,
		struct module *, const char *mod_name);

/* use a define to avoid include chaining to get THIS_MODULE & friends */
#define hid_register_driver(driver) \
	__hid_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)

extern void hid_unregister_driver(struct hid_driver *);

/**
 * module_hid_driver() - Helper macro for registering a HID driver
 * @__hid_driver: hid_driver struct
 *
 * Helper macro for HID drivers which do not do anything special in module
 * init/exit. This eliminates a lot of boilerplate. Each module may only
 * use this macro once, and calling it replaces module_init() and module_exit()
 */
#define module_hid_driver(__hid_driver) \
	module_driver(__hid_driver, hid_register_driver, \
		      hid_unregister_driver)

extern void hidinput_hid_event(struct hid_device *, struct hid_field *, struct hid_usage *, __s32);
extern void hidinput_report_event(struct hid_device *hid, struct hid_report *report);
extern int hidinput_connect(struct hid_device *hid, unsigned int force);
extern void hidinput_disconnect(struct hid_device *);

int hid_set_field(struct hid_field *, unsigned, __s32);
int hid_input_report(struct hid_device *, int type, u8 *, int, int);
int hidinput_find_field(struct hid_device *hid, unsigned int type, unsigned int code, struct hid_field **field);
struct hid_field *hidinput_get_led_field(struct hid_device *hid);
unsigned int hidinput_count_leds(struct hid_device *hid);
__s32 hidinput_calc_abs_res(const struct hid_field *field, __u16 code);
void hid_output_report(struct hid_report *report, __u8 *data);
struct hid_device *hid_allocate_device(void);
struct hid_report *hid_register_report(struct hid_device *device, unsigned type, unsigned id);
int hid_parse_report(struct hid_device *hid, __u8 *start, unsigned size);
int hid_open_report(struct hid_device *device);
int hid_check_keys_pressed(struct hid_device *hid);
int hid_connect(struct hid_device *hid, unsigned int connect_mask);
void hid_disconnect(struct hid_device *hid);
const struct hid_device_id *hid_match_id(struct hid_device *hdev,
					 const struct hid_device_id *id);
s32 hid_snto32(__u32 value, unsigned n);

/**
 * hid_map_usage - map usage input bits
 *
 * @hidinput: hidinput which we are interested in
 * @usage: usage to fill in
 * @bit: pointer to input->{}bit (out parameter)
 * @max: maximal valid usage->code to consider later (out parameter)
 * @type: input event type (EV_KEY, EV_REL, ...)
 * @c: code which corresponds to this usage and type
 */
static inline void hid_map_usage(struct hid_input *hidinput,
		struct hid_usage *usage, unsigned long **bit, int *max,
		__u8 type, __u16 c)
{
	struct input_dev *input = hidinput->input;

	usage->type = type;
	usage->code = c;

	switch (type) {
	case EV_ABS:
		*bit = input->absbit;
		*max = ABS_MAX;
		break;
	case EV_REL:
		*bit = input->relbit;
		*max = REL_MAX;
		break;
	case EV_KEY:
		*bit = input->keybit;
		*max = KEY_MAX;
		break;
	case EV_LED:
		*bit = input->ledbit;
		*max = LED_MAX;
		break;
	}
}

/**
 * hid_map_usage_clear - map usage input bits and clear the input bit
 *
 * The same as hid_map_usage, except the @c bit is also cleared in supported
 * bits (@bit).
 */
static inline void hid_map_usage_clear(struct hid_input *hidinput,
		struct hid_usage *usage, unsigned long **bit, int *max,
		__u8 type, __u16 c)
{
	hid_map_usage(hidinput, usage, bit, max, type, c);
	clear_bit(c, *bit);
}

/**
 * hid_parse - parse HW reports
 *
 * @hdev: hid device
 *
 * Call this from probe after you set up the device (if needed). Your
 * report_fixup will be called (if non-NULL) after reading raw report from
 * device before passing it to hid layer for real parsing.
 */
static inline int __must_check hid_parse(struct hid_device *hdev)
{
	return hid_open_report(hdev);
}

/**
 * hid_hw_start - start underlaying HW
 *
 * @hdev: hid device
 * @connect_mask: which outputs to connect, see HID_CONNECT_*
 *
 * Call this in probe function *after* hid_parse. This will setup HW buffers
 * and start the device (if not deffered to device open). hid_hw_stop must be
 * called if this was successful.
 */
static inline int __must_check hid_hw_start(struct hid_device *hdev,
		unsigned int connect_mask)
{
	int ret = hdev->ll_driver->start(hdev);
	if (ret || !connect_mask)
		return ret;
	ret = hid_connect(hdev, connect_mask);
	if (ret)
		hdev->ll_driver->stop(hdev);
	return ret;
}

/**
 * hid_hw_stop - stop underlaying HW
 *
 * @hdev: hid device
 *
 * This is usually called from remove function or from probe when something
 * failed and hid_hw_start was called already.
 */
static inline void hid_hw_stop(struct hid_device *hdev)
{
	hid_disconnect(hdev);
	hdev->ll_driver->stop(hdev);
}

/**
 * hid_hw_open - signal underlaying HW to start delivering events
 *
 * @hdev: hid device
 *
 * Tell underlying HW to start delivering events from the device.
 * This function should be called sometime after successful call
 * to hid_hiw_start().
 */
static inline int __must_check hid_hw_open(struct hid_device *hdev)
{
	return hdev->ll_driver->open(hdev);
}

/**
 * hid_hw_close - signal underlaying HW to stop delivering events
 *
 * @hdev: hid device
 *
 * This function indicates that we are not interested in the events
 * from this device anymore. Delivery of events may or may not stop,
 * depending on the number of users still outstanding.
 */
static inline void hid_hw_close(struct hid_device *hdev)
{
	hdev->ll_driver->close(hdev);
}

/**
 * hid_hw_power - requests underlying HW to go into given power mode
 *
 * @hdev: hid device
 * @level: requested power level (one of %PM_HINT_* defines)
 *
 * This function requests underlying hardware to enter requested power
 * mode.
 */

static inline int hid_hw_power(struct hid_device *hdev, int level)
{
	return hdev->ll_driver->power ? hdev->ll_driver->power(hdev, level) : 0;
}

int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, int size,
		int interrupt);

/* HID quirks API */
u32 usbhid_lookup_quirk(const u16 idVendor, const u16 idProduct);
int usbhid_quirks_init(char **quirks_param);
void usbhid_quirks_exit(void);
void usbhid_set_leds(struct hid_device *hid);

#ifdef CONFIG_HID_PID
int hid_pidff_init(struct hid_device *hid);
#else
#define hid_pidff_init NULL
#endif

#define dbg_hid(format, arg...)						\
do {									\
	if (hid_debug)							\
		printk(KERN_DEBUG "%s: " format, __FILE__, ##arg);	\
} while (0)

#define hid_printk(level, hid, fmt, arg...)		\
	dev_printk(level, &(hid)->dev, fmt, ##arg)
#define hid_emerg(hid, fmt, arg...)			\
	dev_emerg(&(hid)->dev, fmt, ##arg)
#define hid_crit(hid, fmt, arg...)			\
	dev_crit(&(hid)->dev, fmt, ##arg)
#define hid_alert(hid, fmt, arg...)			\
	dev_alert(&(hid)->dev, fmt, ##arg)
#define hid_err(hid, fmt, arg...)			\
	dev_err(&(hid)->dev, fmt, ##arg)
#define hid_notice(hid, fmt, arg...)			\
	dev_notice(&(hid)->dev, fmt, ##arg)
#define hid_warn(hid, fmt, arg...)			\
	dev_warn(&(hid)->dev, fmt, ##arg)
#define hid_info(hid, fmt, arg...)			\
	dev_info(&(hid)->dev, fmt, ##arg)
#define hid_dbg(hid, fmt, arg...)			\
	dev_dbg(&(hid)->dev, fmt, ##arg)

#endif