/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 *  Copyright (c) 1999 Andreas Gal
 *  Copyright (c) 2000-2001 Vojtech Pavlik
 *  Copyright (c) 2006-2007 Jiri Kosina
 */
/*
 *
 * 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/bitops.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/mutex.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_TELEPHONY        0x000b0000
#define HID_UP_CONSUMER         0x000c0000
#define HID_UP_DIGITIZER        0x000d0000
#define HID_UP_PID              0x000f0000
#define HID_UP_BATTERY          0x00850000
#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_LOGIVENDOR2   0xff090000
#define HID_UP_LOGIVENDOR3   0xff430000
#define HID_UP_LNVENDOR         0xffa00000
#define HID_UP_SENSOR           0x00200000
#define HID_UP_ASUSVENDOR       0xff310000
#define HID_UP_GOOGLEVENDOR     0xffd10000

#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
/*
 * Microsoft Win8 Wireless Radio Controls extensions CA, see:
 * http://www.usb.org/developers/hidpage/HUTRR40RadioHIDUsagesFinal.pdf
 */
#define HID_GD_WIRELESS_RADIO_CTLS      0x0001000c
/*
 * System Multi-Axis, see:
 * http://www.usb.org/developers/hidpage/HUTRR62_-_Generic_Desktop_CA_for_System_Multi-Axis_Controllers.txt
 */
#define HID_GD_SYSTEM_MULTIAXIS 0x0001000e

#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_RESOLUTION_MULTIPLIER    0x00010048
#define HID_GD_SYSTEM_CONTROL   0x00010080
#define HID_GD_UP               0x00010090
#define HID_GD_DOWN             0x00010091
#define HID_GD_RIGHT            0x00010092
#define HID_GD_LEFT             0x00010093
/* Microsoft Win8 Wireless Radio Controls CA usage codes */
#define HID_GD_RFKILL_BTN       0x000100c6
#define HID_GD_RFKILL_LED       0x000100c7
#define HID_GD_RFKILL_SWITCH    0x000100c8

#define HID_DC_BATTERYSTRENGTH  0x00060020

#define HID_CP_CONSUMER_CONTROL 0x000c0001
#define HID_CP_AC_PAN           0x000c0238

#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_WHITEBOARD       0x000d0006
#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_BATTERYSTRENGTH  0x000d003b
#define HID_DG_INVERT           0x000d003c
#define HID_DG_TILT_X           0x000d003d
#define HID_DG_TILT_Y           0x000d003e
#define HID_DG_TWIST            0x000d0041
#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

#define HID_CP_CONSUMERCONTROL  0x000c0001
#define HID_CP_NUMERICKEYPAD    0x000c0002
#define HID_CP_PROGRAMMABLEBUTTONS      0x000c0003
#define HID_CP_MICROPHONE       0x000c0004
#define HID_CP_HEADPHONE        0x000c0005
#define HID_CP_GRAPHICEQUALIZER 0x000c0006
#define HID_CP_FUNCTIONBUTTONS  0x000c0036
#define HID_CP_SELECTION        0x000c0080
#define HID_CP_MEDIASELECTION   0x000c0087
#define HID_CP_SELECTDISC       0x000c00ba
#define HID_CP_VOLUMEUP         0x000c00e9
#define HID_CP_VOLUMEDOWN       0x000c00ea
#define HID_CP_PLAYBACKSPEED    0x000c00f1
#define HID_CP_PROXIMITY        0x000c0109
#define HID_CP_SPEAKERSYSTEM    0x000c0160
#define HID_CP_CHANNELLEFT      0x000c0161
#define HID_CP_CHANNELRIGHT     0x000c0162
#define HID_CP_CHANNELCENTER    0x000c0163
#define HID_CP_CHANNELFRONT     0x000c0164
#define HID_CP_CHANNELCENTERFRONT       0x000c0165
#define HID_CP_CHANNELSIDE      0x000c0166
#define HID_CP_CHANNELSURROUND  0x000c0167
#define HID_CP_CHANNELLOWFREQUENCYENHANCEMENT   0x000c0168
#define HID_CP_CHANNELTOP       0x000c0169
#define HID_CP_CHANNELUNKNOWN   0x000c016a
#define HID_CP_APPLICATIONLAUNCHBUTTONS 0x000c0180
#define HID_CP_GENERICGUIAPPLICATIONCONTROLS    0x000c0200

#define HID_DG_DEVICECONFIG     0x000d000e
#define HID_DG_DEVICESETTINGS   0x000d0023
#define HID_DG_AZIMUTH          0x000d003f
#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
#define HID_DG_SCANTIME         0x000d0056
#define HID_DG_SURFACESWITCH    0x000d0057
#define HID_DG_BUTTONSWITCH     0x000d0058
#define HID_DG_BUTTONTYPE       0x000d0059
#define HID_DG_BARRELSWITCH2    0x000d005a
#define HID_DG_TOOLSERIALNUMBER 0x000d005b
#define HID_DG_LATENCYMODE      0x000d0060

#define HID_BAT_ABSOLUTESTATEOFCHARGE   0x00850065

#define HID_VD_ASUS_CUSTOM_MEDIA_KEYS   0xff310076
/*
 * 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

#define HID_REPORT_TYPES        3

/*
 * HID connect requests
 */

#define HID_CONNECT_HIDINPUT            BIT(0)
#define HID_CONNECT_HIDINPUT_FORCE      BIT(1)
#define HID_CONNECT_HIDRAW              BIT(2)
#define HID_CONNECT_HIDDEV              BIT(3)
#define HID_CONNECT_HIDDEV_FORCE        BIT(4)
#define HID_CONNECT_FF                  BIT(5)
#define HID_CONNECT_DRIVER              BIT(6)
#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                        BIT(0)
#define HID_QUIRK_NOTOUCH                       BIT(1)
#define HID_QUIRK_IGNORE                        BIT(2)
#define HID_QUIRK_NOGET                         BIT(3)
#define HID_QUIRK_HIDDEV_FORCE                  BIT(4)
#define HID_QUIRK_BADPAD                        BIT(5)
#define HID_QUIRK_MULTI_INPUT                   BIT(6)
#define HID_QUIRK_HIDINPUT_FORCE                BIT(7)
/* BIT(8) reserved for backward compatibility, was HID_QUIRK_NO_EMPTY_INPUT */
/* BIT(9) reserved for backward compatibility, was NO_INIT_INPUT_REPORTS */
#define HID_QUIRK_ALWAYS_POLL                   BIT(10)
#define HID_QUIRK_INPUT_PER_APP                 BIT(11)
#define HID_QUIRK_SKIP_OUTPUT_REPORTS           BIT(16)
#define HID_QUIRK_SKIP_OUTPUT_REPORT_ID         BIT(17)
#define HID_QUIRK_NO_OUTPUT_REPORTS_ON_INTR_EP  BIT(18)
#define HID_QUIRK_HAVE_SPECIAL_DRIVER           BIT(19)
#define HID_QUIRK_INCREMENT_USAGE_ON_DUPLICATE  BIT(20)
#define HID_QUIRK_FULLSPEED_INTERVAL            BIT(28)
#define HID_QUIRK_NO_INIT_REPORTS               BIT(29)
#define HID_QUIRK_NO_IGNORE                     BIT(30)
#define HID_QUIRK_NO_INPUT_SYNC                 BIT(31)

/*
 * HID device groups
 *
 * Note: HID_GROUP_ANY is declared in linux/mod_devicetable.h
 * and has a value of 0x0000
 */
#define HID_GROUP_GENERIC                       0x0001
#define HID_GROUP_MULTITOUCH                    0x0002
#define HID_GROUP_SENSOR_HUB                    0x0003
#define HID_GROUP_MULTITOUCH_WIN_8              0x0004

/*
 * Vendor specific HID device groups
 */
#define HID_GROUP_RMI                           0x0100
#define HID_GROUP_WACOM                         0x0101
#define HID_GROUP_LOGITECH_DJ_DEVICE            0x0102
#define HID_GROUP_STEAM                         0x0103
#define HID_GROUP_LOGITECH_27MHZ_DEVICE         0x0104
#define HID_GROUP_VIVALDI                       0x0105

/*
 * HID protocol status
 */
#define HID_REPORT_PROTOCOL     1
#define HID_BOOT_PROTOCOL       0

/*
 * 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 */
        u8 usage_size[HID_MAX_USAGES]; /* usage size 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 {
        int parent_idx; /* device->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 */
        __s8      resolution_multiplier;/* Effective Resolution Multiplier
                                           (HUT v1.12, 4.3.1), default: 1 */
        /* hidinput data */
        __s8      wheel_factor;         /* 120/resolution_multiplier */
        __u16     code;                 /* input driver code */
        __u8      type;                 /* input driver type */
        __s8      hat_min;              /* hat switch fun */
        __s8      hat_max;              /* ditto */
        __s8      hat_dir;              /* ditto */
        __s16     wheel_accumulated;    /* hi-res wheel */
};

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;
        struct list_head hidinput_list;
        unsigned int id;                                /* id of this report */
        unsigned int type;                              /* report type */
        unsigned int application;                       /* application usage for this report */
        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 */
};

#define HID_MAX_IDS 256

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

#define HID_MIN_BUFFER_SIZE     64              /* make sure there is at least a packet size of space */
#define HID_MAX_BUFFER_SIZE     16384           /* 16kb */
#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       BIT(0)
#define HID_CLAIMED_HIDDEV      BIT(1)
#define HID_CLAIMED_HIDRAW      BIT(2)
#define HID_CLAIMED_DRIVER      BIT(3)

#define HID_STAT_ADDED          BIT(0)
#define HID_STAT_PARSED         BIT(1)
#define HID_STAT_DUP_DETECTED   BIT(2)
#define HID_STAT_REPROBED       BIT(3)

struct hid_input {
        struct list_head list;
        struct hid_report *report;
        struct input_dev *input;
        const char *name;
        bool registered;
        struct list_head reports;       /* the list of reports */
        unsigned int application;       /* application usage for this input */
};

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

enum hid_battery_status {
        HID_BATTERY_UNKNOWN = 0,
        HID_BATTERY_QUERIED,            /* Kernel explicitly queried battery strength */
        HID_BATTERY_REPORTED,           /* Device sent unsolicited battery strength report */
};

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 work_struct led_work;                                    /* delayed LED worker */

        struct semaphore driver_input_lock;                             /* protects the current driver */
        struct device dev;                                              /* device */
        struct hid_driver *driver;

        struct hid_ll_driver *ll_driver;
        struct mutex ll_open_lock;
        unsigned int ll_open_count;

#ifdef CONFIG_HID_BATTERY_STRENGTH
        /*
         * Power supply information for HID devices which report
         * battery strength. power_supply was successfully registered if
         * battery is non-NULL.
         */
        struct power_supply *battery;
        __s32 battery_capacity;
        __s32 battery_min;
        __s32 battery_max;
        __s32 battery_report_type;
        __s32 battery_report_id;
        enum hid_battery_status battery_status;
        bool battery_avoid_query;
        ktime_t battery_ratelimit_time;
#endif

        unsigned long status;                                           /* see STAT flags above */
        unsigned claimed;                                               /* Claimed by hidinput, hiddev? */
        unsigned quirks;                                                /* Various quirks the device can pull on us */
        bool io_started;                                                /* If IO has started */

        struct list_head inputs;                                        /* The list of inputs */
        void *hiddev;                                                   /* The hiddev structure */
        void *hidraw;

        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 *);

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

#define to_hid_device(pdev) \
        container_of(pdev, struct hid_device, dev)

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

#define HID_SCAN_FLAG_MT_WIN_8                  BIT(0)
#define HID_SCAN_FLAG_VENDOR_SPECIFIC           BIT(1)
#define HID_SCAN_FLAG_GD_POINTER                BIT(2)

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

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_I2C_DEVICE(ven, prod)                               \
        .bus = BUS_I2C, .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
 * @match: check if the given device is handled by this driver
 * @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)
 *
 * probe should return -errno on error, or 0 on success. During probe,
 * input will not be passed to raw_event unless hid_device_io_start is
 * called.
 *
 * raw_event and event should return negative on error, any other value will
 * pass the event on to .event() typically return 0 for success.
 *
 * 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;

        bool (*match)(struct hid_device *dev, bool ignore_special_driver);
        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);
        int (*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;
};

#define to_hid_driver(pdrv) \
        container_of(pdrv, struct hid_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
 * @power: request underlying hardware to enter requested power mode
 * @parse: this method is called only once to parse the device data,
 *         shouldn't allocate anything to not leak memory
 * @request: send report request to device (e.g. feature report)
 * @wait: wait for buffered io to complete (send/recv reports)
 * @raw_request: send raw report request to device (e.g. feature report)
 * @output_report: send output report to device
 * @idle: send idle request to device
 */
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 (*parse)(struct hid_device *hdev);

        void (*request)(struct hid_device *hdev,
                        struct hid_report *report, int reqtype);

        int (*wait)(struct hid_device *hdev);

        int (*raw_request) (struct hid_device *hdev, unsigned char reportnum,
                            __u8 *buf, size_t len, unsigned char rtype,
                            int reqtype);

        int (*output_report) (struct hid_device *hdev, __u8 *buf, size_t len);

        int (*idle)(struct hid_device *hdev, int report, int idle, int reqtype);
};

extern struct hid_ll_driver i2c_hid_ll_driver;
extern struct hid_ll_driver hidp_hid_driver;
extern struct hid_ll_driver uhid_hid_driver;
extern struct hid_ll_driver usb_hid_driver;

static inline bool hid_is_using_ll_driver(struct hid_device *hdev,
                struct hid_ll_driver *driver)
{
        return hdev->ll_driver == driver;
}

#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 >= HID_UP_GENDESK) && (a <= HID_GD_MULTIAXIS)) \
                || ((a >= HID_DG_PEN) && (a <= HID_DG_WHITEBOARD)) \
                || (a == HID_GD_SYSTEM_CONTROL) || (a == HID_CP_CONSUMER_CONTROL) \
                || (a == HID_GD_WIRELESS_RADIO_CTLS))

/* 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 struct bus_type hid_bus_type;

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 *, u32, 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);
int __hid_request(struct hid_device *hid, struct hid_report *rep, int reqtype);
u8 *hid_alloc_report_buf(struct hid_report *report, gfp_t flags);
struct hid_device *hid_allocate_device(void);
struct hid_report *hid_register_report(struct hid_device *device,
                                       unsigned int type, unsigned int id,
                                       unsigned int application);
int hid_parse_report(struct hid_device *hid, __u8 *start, unsigned size);
struct hid_report *hid_validate_values(struct hid_device *hid,
                                       unsigned int type, unsigned int id,
                                       unsigned int field_index,
                                       unsigned int report_counts);

void hid_setup_resolution_multiplier(struct hid_device *hid);
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);
bool hid_match_one_id(const struct hid_device *hdev,
                      const struct hid_device_id *id);
const struct hid_device_id *hid_match_id(const struct hid_device *hdev,
                                         const struct hid_device_id *id);
const struct hid_device_id *hid_match_device(struct hid_device *hdev,
                                             struct hid_driver *hdrv);
bool hid_compare_device_paths(struct hid_device *hdev_a,
                              struct hid_device *hdev_b, char separator);
s32 hid_snto32(__u32 value, unsigned n);
__u32 hid_field_extract(const struct hid_device *hid, __u8 *report,
                     unsigned offset, unsigned n);

/**
 * hid_device_io_start - enable HID input during probe, remove
 *
 * @hid: the device
 *
 * This should only be called during probe or remove and only be
 * called by the thread calling probe or remove. It will allow
 * incoming packets to be delivered to the driver.
 */
static inline void hid_device_io_start(struct hid_device *hid) {
        if (hid->io_started) {
                dev_warn(&hid->dev, "io already started\n");
                return;
        }
        hid->io_started = true;
        up(&hid->driver_input_lock);
}

/**
 * hid_device_io_stop - disable HID input during probe, remove
 *
 * @hid: the device
 *
 * Should only be called after hid_device_io_start. It will prevent
 * incoming packets from going to the driver for the duration of
 * probe, remove. If called during probe, packets will still go to the
 * driver after probe is complete. This function should only be called
 * by the thread calling probe or remove.
 */
static inline void hid_device_io_stop(struct hid_device *hid) {
        if (!hid->io_started) {
                dev_warn(&hid->dev, "io already stopped\n");
                return;
        }
        hid->io_started = false;
        down(&hid->driver_input_lock);
}

/**
 * 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
 *
 * The value pointed to by @bit will be set to NULL if either @type is
 * an unhandled event type, or if @c is out of range for @type. This
 * can be used as an error condition.
 */
static inline void hid_map_usage(struct hid_input *hidinput,
                struct hid_usage *usage, unsigned long **bit, int *max,
                __u8 type, unsigned int c)
{
        struct input_dev *input = hidinput->input;
        unsigned long *bmap = NULL;
        unsigned int limit = 0;

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

        if (unlikely(c > limit || !bmap)) {
                pr_warn_ratelimited("%s: Invalid code %d type %d\n",
                                    input->name, c, type);
                *bit = NULL;
                return;
        }

        usage->type = type;
        usage->code = c;
        *max = limit;
        *bit = bmap;
}

/**
 * hid_map_usage_clear - map usage input bits and clear the input bit
 *
 * @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
 *
 * 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);
        if (*bit)
                clear_bit(usage->code, *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);
}

int __must_check hid_hw_start(struct hid_device *hdev,
                              unsigned int connect_mask);
void hid_hw_stop(struct hid_device *hdev);
int __must_check hid_hw_open(struct hid_device *hdev);
void hid_hw_close(struct hid_device *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;
}


/**
 * hid_hw_request - send report request to device
 *
 * @hdev: hid device
 * @report: report to send
 * @reqtype: hid request type
 */
static inline void hid_hw_request(struct hid_device *hdev,
                                  struct hid_report *report, int reqtype)
{
        if (hdev->ll_driver->request)
                return hdev->ll_driver->request(hdev, report, reqtype);

        __hid_request(hdev, report, reqtype);
}

/**
 * hid_hw_raw_request - send report request to device
 *
 * @hdev: hid device
 * @reportnum: report ID
 * @buf: in/out data to transfer
 * @len: length of buf
 * @rtype: HID report type
 * @reqtype: HID_REQ_GET_REPORT or HID_REQ_SET_REPORT
 *
 * Return: count of data transferred, negative if error
 *
 * Same behavior as hid_hw_request, but with raw buffers instead.
 */
static inline int hid_hw_raw_request(struct hid_device *hdev,
                                  unsigned char reportnum, __u8 *buf,
                                  size_t len, unsigned char rtype, int reqtype)
{
        if (len < 1 || len > HID_MAX_BUFFER_SIZE || !buf)
                return -EINVAL;

        return hdev->ll_driver->raw_request(hdev, reportnum, buf, len,
                                                    rtype, reqtype);
}

/**
 * hid_hw_output_report - send output report to device
 *
 * @hdev: hid device
 * @buf: raw data to transfer
 * @len: length of buf
 *
 * Return: count of data transferred, negative if error
 */
static inline int hid_hw_output_report(struct hid_device *hdev, __u8 *buf,
                                        size_t len)
{
        if (len < 1 || len > HID_MAX_BUFFER_SIZE || !buf)
                return -EINVAL;

        if (hdev->ll_driver->output_report)
                return hdev->ll_driver->output_report(hdev, buf, len);

        return -ENOSYS;
}

/**
 * hid_hw_idle - send idle request to device
 *
 * @hdev: hid device
 * @report: report to control
 * @idle: idle state
 * @reqtype: hid request type
 */
static inline int hid_hw_idle(struct hid_device *hdev, int report, int idle,
                int reqtype)
{
        if (hdev->ll_driver->idle)
                return hdev->ll_driver->idle(hdev, report, idle, reqtype);

        return 0;
}

/**
 * hid_hw_wait - wait for buffered io to complete
 *
 * @hdev: hid device
 */
static inline void hid_hw_wait(struct hid_device *hdev)
{
        if (hdev->ll_driver->wait)
                hdev->ll_driver->wait(hdev);
}

/**
 * hid_report_len - calculate the report length
 *
 * @report: the report we want to know the length
 */
static inline u32 hid_report_len(struct hid_report *report)
{
        return DIV_ROUND_UP(report->size, 8) + (report->id > 0);
}

int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, u32 size,
                int interrupt);

/* HID quirks API */
unsigned long hid_lookup_quirk(const struct hid_device *hdev);
int hid_quirks_init(char **quirks_param, __u16 bus, int count);
void hid_quirks_exit(__u16 bus);

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

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

#define hid_err(hid, fmt, ...)                          \
        dev_err(&(hid)->dev, fmt, ##__VA_ARGS__)
#define hid_notice(hid, fmt, ...)                       \
        dev_notice(&(hid)->dev, fmt, ##__VA_ARGS__)
#define hid_warn(hid, fmt, ...)                         \
        dev_warn(&(hid)->dev, fmt, ##__VA_ARGS__)
#define hid_info(hid, fmt, ...)                         \
        dev_info(&(hid)->dev, fmt, ##__VA_ARGS__)
#define hid_dbg(hid, fmt, ...)                          \
        dev_dbg(&(hid)->dev, fmt, ##__VA_ARGS__)

#define hid_err_once(hid, fmt, ...)                     \
        dev_err_once(&(hid)->dev, fmt, ##__VA_ARGS__)
#define hid_notice_once(hid, fmt, ...)                  \
        dev_notice_once(&(hid)->dev, fmt, ##__VA_ARGS__)
#define hid_warn_once(hid, fmt, ...)                    \
        dev_warn_once(&(hid)->dev, fmt, ##__VA_ARGS__)
#define hid_info_once(hid, fmt, ...)                    \
        dev_info_once(&(hid)->dev, fmt, ##__VA_ARGS__)
#define hid_dbg_once(hid, fmt, ...)                     \
        dev_dbg_once(&(hid)->dev, fmt, ##__VA_ARGS__)

#endif