/*
 *  HID driver for Sony / PS2 / PS3 / PS4 BD devices.
 *
 *  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) 2008 Jiri Slaby
 *  Copyright (c) 2012 David Dillow <dave@thedillows.org>
 *  Copyright (c) 2006-2013 Jiri Kosina
 *  Copyright (c) 2013 Colin Leitner <colin.leitner@gmail.com>
 *  Copyright (c) 2014-2016 Frank Praznik <frank.praznik@gmail.com>
 *  Copyright (c) 2018 Todd Kelner
 */

/*
 * 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.
 */

/*
 * NOTE: in order for the Sony PS3 BD Remote Control to be found by
 * a Bluetooth host, the key combination Start+Enter has to be kept pressed
 * for about 7 seconds with the Bluetooth Host Controller in discovering mode.
 *
 * There will be no PIN request from the device.
 */

#include <linux/device.h>
#include <linux/hid.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/leds.h>
#include <linux/power_supply.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/idr.h>
#include <linux/input/mt.h>
#include <linux/crc32.h>
#include <asm/unaligned.h>

#include "hid-ids.h"

#define VAIO_RDESC_CONSTANT       BIT(0)
#define SIXAXIS_CONTROLLER_USB    BIT(1)
#define SIXAXIS_CONTROLLER_BT     BIT(2)
#define BUZZ_CONTROLLER           BIT(3)
#define PS3REMOTE                 BIT(4)
#define DUALSHOCK4_CONTROLLER_USB BIT(5)
#define DUALSHOCK4_CONTROLLER_BT  BIT(6)
#define DUALSHOCK4_DONGLE         BIT(7)
#define MOTION_CONTROLLER_USB     BIT(8)
#define MOTION_CONTROLLER_BT      BIT(9)
#define NAVIGATION_CONTROLLER_USB BIT(10)
#define NAVIGATION_CONTROLLER_BT  BIT(11)
#define SINO_LITE_CONTROLLER      BIT(12)
#define FUTUREMAX_DANCE_MAT       BIT(13)
#define NSG_MR5U_REMOTE_BT        BIT(14)
#define NSG_MR7U_REMOTE_BT        BIT(15)

#define SIXAXIS_CONTROLLER (SIXAXIS_CONTROLLER_USB | SIXAXIS_CONTROLLER_BT)
#define MOTION_CONTROLLER (MOTION_CONTROLLER_USB | MOTION_CONTROLLER_BT)
#define NAVIGATION_CONTROLLER (NAVIGATION_CONTROLLER_USB |\
                                NAVIGATION_CONTROLLER_BT)
#define DUALSHOCK4_CONTROLLER (DUALSHOCK4_CONTROLLER_USB |\
                                DUALSHOCK4_CONTROLLER_BT | \
                                DUALSHOCK4_DONGLE)
#define SONY_LED_SUPPORT (SIXAXIS_CONTROLLER | BUZZ_CONTROLLER |\
                                DUALSHOCK4_CONTROLLER | MOTION_CONTROLLER |\
                                NAVIGATION_CONTROLLER)
#define SONY_BATTERY_SUPPORT (SIXAXIS_CONTROLLER | DUALSHOCK4_CONTROLLER |\
                                MOTION_CONTROLLER_BT | NAVIGATION_CONTROLLER)
#define SONY_FF_SUPPORT (SIXAXIS_CONTROLLER | DUALSHOCK4_CONTROLLER |\
                                MOTION_CONTROLLER)
#define SONY_BT_DEVICE (SIXAXIS_CONTROLLER_BT | DUALSHOCK4_CONTROLLER_BT |\
                        MOTION_CONTROLLER_BT | NAVIGATION_CONTROLLER_BT)
#define NSG_MRXU_REMOTE (NSG_MR5U_REMOTE_BT | NSG_MR7U_REMOTE_BT)

#define MAX_LEDS 4
#define NSG_MRXU_MAX_X 1667
#define NSG_MRXU_MAX_Y 1868


/* PS/3 Motion controller */
static u8 motion_rdesc[] = {
        0x05, 0x01,         /*  Usage Page (Desktop),               */
        0x09, 0x04,         /*  Usage (Joystick),                   */
        0xA1, 0x01,         /*  Collection (Application),           */
        0xA1, 0x02,         /*      Collection (Logical),           */
        0x85, 0x01,         /*          Report ID (1),              */
        0x75, 0x01,         /*          Report Size (1),            */
        0x95, 0x15,         /*          Report Count (21),          */
        0x15, 0x00,         /*          Logical Minimum (0),        */
        0x25, 0x01,         /*          Logical Maximum (1),        */
        0x35, 0x00,         /*          Physical Minimum (0),       */
        0x45, 0x01,         /*          Physical Maximum (1),       */
        0x05, 0x09,         /*          Usage Page (Button),        */
        0x19, 0x01,         /*          Usage Minimum (01h),        */
        0x29, 0x15,         /*          Usage Maximum (15h),        */
        0x81, 0x02,         /*          Input (Variable),           * Buttons */
        0x95, 0x0B,         /*          Report Count (11),          */
        0x06, 0x00, 0xFF,   /*          Usage Page (FF00h),         */
        0x81, 0x03,         /*          Input (Constant, Variable), * Padding */
        0x15, 0x00,         /*          Logical Minimum (0),        */
        0x26, 0xFF, 0x00,   /*          Logical Maximum (255),      */
        0x05, 0x01,         /*          Usage Page (Desktop),       */
        0xA1, 0x00,         /*          Collection (Physical),      */
        0x75, 0x08,         /*              Report Size (8),        */
        0x95, 0x01,         /*              Report Count (1),       */
        0x35, 0x00,         /*              Physical Minimum (0),   */
        0x46, 0xFF, 0x00,   /*              Physical Maximum (255), */
        0x09, 0x30,         /*              Usage (X),              */
        0x81, 0x02,         /*              Input (Variable),       * Trigger */
        0xC0,               /*          End Collection,             */
        0x06, 0x00, 0xFF,   /*          Usage Page (FF00h),         */
        0x75, 0x08,         /*          Report Size (8),            */
        0x95, 0x07,         /*          Report Count (7),           * skip 7 bytes */
        0x81, 0x02,         /*          Input (Variable),           */
        0x05, 0x01,         /*          Usage Page (Desktop),       */
        0x75, 0x10,         /*          Report Size (16),           */
        0x46, 0xFF, 0xFF,   /*          Physical Maximum (65535),   */
        0x27, 0xFF, 0xFF, 0x00, 0x00, /*      Logical Maximum (65535),    */
        0x95, 0x03,         /*          Report Count (3),           * 3x Accels */
        0x09, 0x33,         /*              Usage (rX),             */
        0x09, 0x34,         /*              Usage (rY),             */
        0x09, 0x35,         /*              Usage (rZ),             */
        0x81, 0x02,         /*          Input (Variable),           */
        0x06, 0x00, 0xFF,   /*          Usage Page (FF00h),         */
        0x95, 0x03,         /*          Report Count (3),           * Skip Accels 2nd frame */
        0x81, 0x02,         /*          Input (Variable),           */
        0x05, 0x01,         /*          Usage Page (Desktop),       */
        0x09, 0x01,         /*          Usage (Pointer),            */
        0x95, 0x03,         /*          Report Count (3),           * 3x Gyros */
        0x81, 0x02,         /*          Input (Variable),           */
        0x06, 0x00, 0xFF,   /*          Usage Page (FF00h),         */
        0x95, 0x03,         /*          Report Count (3),           * Skip Gyros 2nd frame */
        0x81, 0x02,         /*          Input (Variable),           */
        0x75, 0x0C,         /*          Report Size (12),           */
        0x46, 0xFF, 0x0F,   /*          Physical Maximum (4095),    */
        0x26, 0xFF, 0x0F,   /*          Logical Maximum (4095),     */
        0x95, 0x04,         /*          Report Count (4),           * Skip Temp and Magnetometers */
        0x81, 0x02,         /*          Input (Variable),           */
        0x75, 0x08,         /*          Report Size (8),            */
        0x46, 0xFF, 0x00,   /*          Physical Maximum (255),     */
        0x26, 0xFF, 0x00,   /*          Logical Maximum (255),      */
        0x95, 0x06,         /*          Report Count (6),           * Skip Timestamp and Extension Bytes */
        0x81, 0x02,         /*          Input (Variable),           */
        0x75, 0x08,         /*          Report Size (8),            */
        0x95, 0x30,         /*          Report Count (48),          */
        0x09, 0x01,         /*          Usage (Pointer),            */
        0x91, 0x02,         /*          Output (Variable),          */
        0x75, 0x08,         /*          Report Size (8),            */
        0x95, 0x30,         /*          Report Count (48),          */
        0x09, 0x01,         /*          Usage (Pointer),            */
        0xB1, 0x02,         /*          Feature (Variable),         */
        0xC0,               /*      End Collection,                 */
        0xA1, 0x02,         /*      Collection (Logical),           */
        0x85, 0x02,         /*          Report ID (2),              */
        0x75, 0x08,         /*          Report Size (8),            */
        0x95, 0x30,         /*          Report Count (48),          */
        0x09, 0x01,         /*          Usage (Pointer),            */
        0xB1, 0x02,         /*          Feature (Variable),         */
        0xC0,               /*      End Collection,                 */
        0xA1, 0x02,         /*      Collection (Logical),           */
        0x85, 0xEE,         /*          Report ID (238),            */
        0x75, 0x08,         /*          Report Size (8),            */
        0x95, 0x30,         /*          Report Count (48),          */
        0x09, 0x01,         /*          Usage (Pointer),            */
        0xB1, 0x02,         /*          Feature (Variable),         */
        0xC0,               /*      End Collection,                 */
        0xA1, 0x02,         /*      Collection (Logical),           */
        0x85, 0xEF,         /*          Report ID (239),            */
        0x75, 0x08,         /*          Report Size (8),            */
        0x95, 0x30,         /*          Report Count (48),          */
        0x09, 0x01,         /*          Usage (Pointer),            */
        0xB1, 0x02,         /*          Feature (Variable),         */
        0xC0,               /*      End Collection,                 */
        0xC0                /*  End Collection                      */
};

static u8 ps3remote_rdesc[] = {
        0x05, 0x01,          /* GUsagePage Generic Desktop */
        0x09, 0x05,          /* LUsage 0x05 [Game Pad] */
        0xA1, 0x01,          /* MCollection Application (mouse, keyboard) */

         /* Use collection 1 for joypad buttons */
         0xA1, 0x02,         /* MCollection Logical (interrelated data) */

          /*
           * Ignore the 1st byte, maybe it is used for a controller
           * number but it's not needed for correct operation
           */
          0x75, 0x08,        /* GReportSize 0x08 [8] */
          0x95, 0x01,        /* GReportCount 0x01 [1] */
          0x81, 0x01,        /* MInput 0x01 (Const[0] Arr[1] Abs[2]) */

          /*
           * Bytes from 2nd to 4th are a bitmap for joypad buttons, for these
           * buttons multiple keypresses are allowed
           */
          0x05, 0x09,        /* GUsagePage Button */
          0x19, 0x01,        /* LUsageMinimum 0x01 [Button 1 (primary/trigger)] */
          0x29, 0x18,        /* LUsageMaximum 0x18 [Button 24] */
          0x14,              /* GLogicalMinimum [0] */
          0x25, 0x01,        /* GLogicalMaximum 0x01 [1] */
          0x75, 0x01,        /* GReportSize 0x01 [1] */
          0x95, 0x18,        /* GReportCount 0x18 [24] */
          0x81, 0x02,        /* MInput 0x02 (Data[0] Var[1] Abs[2]) */

          0xC0,              /* MEndCollection */

         /* Use collection 2 for remote control buttons */
         0xA1, 0x02,         /* MCollection Logical (interrelated data) */

          /* 5th byte is used for remote control buttons */
          0x05, 0x09,        /* GUsagePage Button */
          0x18,              /* LUsageMinimum [No button pressed] */
          0x29, 0xFE,        /* LUsageMaximum 0xFE [Button 254] */
          0x14,              /* GLogicalMinimum [0] */
          0x26, 0xFE, 0x00,  /* GLogicalMaximum 0x00FE [254] */
          0x75, 0x08,        /* GReportSize 0x08 [8] */
          0x95, 0x01,        /* GReportCount 0x01 [1] */
          0x80,              /* MInput  */

          /*
           * Ignore bytes from 6th to 11th, 6th to 10th are always constant at
           * 0xff and 11th is for press indication
           */
          0x75, 0x08,        /* GReportSize 0x08 [8] */
          0x95, 0x06,        /* GReportCount 0x06 [6] */
          0x81, 0x01,        /* MInput 0x01 (Const[0] Arr[1] Abs[2]) */

          /* 12th byte is for battery strength */
          0x05, 0x06,        /* GUsagePage Generic Device Controls */
          0x09, 0x20,        /* LUsage 0x20 [Battery Strength] */
          0x14,              /* GLogicalMinimum [0] */
          0x25, 0x05,        /* GLogicalMaximum 0x05 [5] */
          0x75, 0x08,        /* GReportSize 0x08 [8] */
          0x95, 0x01,        /* GReportCount 0x01 [1] */
          0x81, 0x02,        /* MInput 0x02 (Data[0] Var[1] Abs[2]) */

          0xC0,              /* MEndCollection */

         0xC0                /* MEndCollection [Game Pad] */
};

static const unsigned int ps3remote_keymap_joypad_buttons[] = {
        [0x01] = KEY_SELECT,
        [0x02] = BTN_THUMBL,            /* L3 */
        [0x03] = BTN_THUMBR,            /* R3 */
        [0x04] = BTN_START,
        [0x05] = KEY_UP,
        [0x06] = KEY_RIGHT,
        [0x07] = KEY_DOWN,
        [0x08] = KEY_LEFT,
        [0x09] = BTN_TL2,               /* L2 */
        [0x0a] = BTN_TR2,               /* R2 */
        [0x0b] = BTN_TL,                /* L1 */
        [0x0c] = BTN_TR,                /* R1 */
        [0x0d] = KEY_OPTION,            /* options/triangle */
        [0x0e] = KEY_BACK,              /* back/circle */
        [0x0f] = BTN_0,                 /* cross */
        [0x10] = KEY_SCREEN,            /* view/square */
        [0x11] = KEY_HOMEPAGE,          /* PS button */
        [0x14] = KEY_ENTER,
};
static const unsigned int ps3remote_keymap_remote_buttons[] = {
        [0x00] = KEY_1,
        [0x01] = KEY_2,
        [0x02] = KEY_3,
        [0x03] = KEY_4,
        [0x04] = KEY_5,
        [0x05] = KEY_6,
        [0x06] = KEY_7,
        [0x07] = KEY_8,
        [0x08] = KEY_9,
        [0x09] = KEY_0,
        [0x0e] = KEY_ESC,               /* return */
        [0x0f] = KEY_CLEAR,
        [0x16] = KEY_EJECTCD,
        [0x1a] = KEY_MENU,              /* top menu */
        [0x28] = KEY_TIME,
        [0x30] = KEY_PREVIOUS,
        [0x31] = KEY_NEXT,
        [0x32] = KEY_PLAY,
        [0x33] = KEY_REWIND,            /* scan back */
        [0x34] = KEY_FORWARD,           /* scan forward */
        [0x38] = KEY_STOP,
        [0x39] = KEY_PAUSE,
        [0x40] = KEY_CONTEXT_MENU,      /* pop up/menu */
        [0x60] = KEY_FRAMEBACK,         /* slow/step back */
        [0x61] = KEY_FRAMEFORWARD,      /* slow/step forward */
        [0x63] = KEY_SUBTITLE,
        [0x64] = KEY_AUDIO,
        [0x65] = KEY_ANGLE,
        [0x70] = KEY_INFO,              /* display */
        [0x80] = KEY_BLUE,
        [0x81] = KEY_RED,
        [0x82] = KEY_GREEN,
        [0x83] = KEY_YELLOW,
};

static const unsigned int buzz_keymap[] = {
        /*
         * The controller has 4 remote buzzers, each with one LED and 5
         * buttons.
         *
         * We use the mapping chosen by the controller, which is:
         *
         * Key          Offset
         * -------------------
         * Buzz              1
         * Blue              5
         * Orange            4
         * Green             3
         * Yellow            2
         *
         * So, for example, the orange button on the third buzzer is mapped to
         * BTN_TRIGGER_HAPPY14
         */
         [1] = BTN_TRIGGER_HAPPY1,
         [2] = BTN_TRIGGER_HAPPY2,
         [3] = BTN_TRIGGER_HAPPY3,
         [4] = BTN_TRIGGER_HAPPY4,
         [5] = BTN_TRIGGER_HAPPY5,
         [6] = BTN_TRIGGER_HAPPY6,
         [7] = BTN_TRIGGER_HAPPY7,
         [8] = BTN_TRIGGER_HAPPY8,
         [9] = BTN_TRIGGER_HAPPY9,
        [10] = BTN_TRIGGER_HAPPY10,
        [11] = BTN_TRIGGER_HAPPY11,
        [12] = BTN_TRIGGER_HAPPY12,
        [13] = BTN_TRIGGER_HAPPY13,
        [14] = BTN_TRIGGER_HAPPY14,
        [15] = BTN_TRIGGER_HAPPY15,
        [16] = BTN_TRIGGER_HAPPY16,
        [17] = BTN_TRIGGER_HAPPY17,
        [18] = BTN_TRIGGER_HAPPY18,
        [19] = BTN_TRIGGER_HAPPY19,
        [20] = BTN_TRIGGER_HAPPY20,
};

/* The Navigation controller is a partial DS3 and uses the same HID report
 * and hence the same keymap indices, however not not all axes/buttons
 * are physically present. We use the same axis and button mapping as
 * the DS3, which uses the Linux gamepad spec.
 */
static const unsigned int navigation_absmap[] = {
        [0x30] = ABS_X,
        [0x31] = ABS_Y,
        [0x33] = ABS_Z, /* L2 */
};

/* Buttons not physically available on the device, but still available
 * in the reports are explicitly set to 0 for documentation purposes.
 */
static const unsigned int navigation_keymap[] = {
        [0x01] = 0, /* Select */
        [0x02] = BTN_THUMBL, /* L3 */
        [0x03] = 0, /* R3 */
        [0x04] = 0, /* Start */
        [0x05] = BTN_DPAD_UP, /* Up */
        [0x06] = BTN_DPAD_RIGHT, /* Right */
        [0x07] = BTN_DPAD_DOWN, /* Down */
        [0x08] = BTN_DPAD_LEFT, /* Left */
        [0x09] = BTN_TL2, /* L2 */
        [0x0a] = 0, /* R2 */
        [0x0b] = BTN_TL, /* L1 */
        [0x0c] = 0, /* R1 */
        [0x0d] = BTN_NORTH, /* Triangle */
        [0x0e] = BTN_EAST, /* Circle */
        [0x0f] = BTN_SOUTH, /* Cross */
        [0x10] = BTN_WEST, /* Square */
        [0x11] = BTN_MODE, /* PS */
};

static const unsigned int sixaxis_absmap[] = {
        [0x30] = ABS_X,
        [0x31] = ABS_Y,
        [0x32] = ABS_RX, /* right stick X */
        [0x35] = ABS_RY, /* right stick Y */
};

static const unsigned int sixaxis_keymap[] = {
        [0x01] = BTN_SELECT, /* Select */
        [0x02] = BTN_THUMBL, /* L3 */
        [0x03] = BTN_THUMBR, /* R3 */
        [0x04] = BTN_START, /* Start */
        [0x05] = BTN_DPAD_UP, /* Up */
        [0x06] = BTN_DPAD_RIGHT, /* Right */
        [0x07] = BTN_DPAD_DOWN, /* Down */
        [0x08] = BTN_DPAD_LEFT, /* Left */
        [0x09] = BTN_TL2, /* L2 */
        [0x0a] = BTN_TR2, /* R2 */
        [0x0b] = BTN_TL, /* L1 */
        [0x0c] = BTN_TR, /* R1 */
        [0x0d] = BTN_NORTH, /* Triangle */
        [0x0e] = BTN_EAST, /* Circle */
        [0x0f] = BTN_SOUTH, /* Cross */
        [0x10] = BTN_WEST, /* Square */
        [0x11] = BTN_MODE, /* PS */
};

static const unsigned int ds4_absmap[] = {
        [0x30] = ABS_X,
        [0x31] = ABS_Y,
        [0x32] = ABS_RX, /* right stick X */
        [0x33] = ABS_Z, /* L2 */
        [0x34] = ABS_RZ, /* R2 */
        [0x35] = ABS_RY, /* right stick Y */
};

static const unsigned int ds4_keymap[] = {
        [0x1] = BTN_WEST, /* Square */
        [0x2] = BTN_SOUTH, /* Cross */
        [0x3] = BTN_EAST, /* Circle */
        [0x4] = BTN_NORTH, /* Triangle */
        [0x5] = BTN_TL, /* L1 */
        [0x6] = BTN_TR, /* R1 */
        [0x7] = BTN_TL2, /* L2 */
        [0x8] = BTN_TR2, /* R2 */
        [0x9] = BTN_SELECT, /* Share */
        [0xa] = BTN_START, /* Options */
        [0xb] = BTN_THUMBL, /* L3 */
        [0xc] = BTN_THUMBR, /* R3 */
        [0xd] = BTN_MODE, /* PS */
};

static const struct {int x; int y; } ds4_hat_mapping[] = {
        {0, -1}, {1, -1}, {1, 0}, {1, 1}, {0, 1}, {-1, 1}, {-1, 0}, {-1, -1},
        {0, 0}
};

static enum power_supply_property sony_battery_props[] = {
        POWER_SUPPLY_PROP_PRESENT,
        POWER_SUPPLY_PROP_CAPACITY,
        POWER_SUPPLY_PROP_SCOPE,
        POWER_SUPPLY_PROP_STATUS,
};

struct sixaxis_led {
        u8 time_enabled; /* the total time the led is active (0xff means forever) */
        u8 duty_length;  /* how long a cycle is in deciseconds (0 means "really fast") */
        u8 enabled;
        u8 duty_off; /* % of duty_length the led is off (0xff means 100%) */
        u8 duty_on;  /* % of duty_length the led is on (0xff mean 100%) */
} __packed;

struct sixaxis_rumble {
        u8 padding;
        u8 right_duration; /* Right motor duration (0xff means forever) */
        u8 right_motor_on; /* Right (small) motor on/off, only supports values of 0 or 1 (off/on) */
        u8 left_duration;    /* Left motor duration (0xff means forever) */
        u8 left_motor_force; /* left (large) motor, supports force values from 0 to 255 */
} __packed;

struct sixaxis_output_report {
        u8 report_id;
        struct sixaxis_rumble rumble;
        u8 padding[4];
        u8 leds_bitmap; /* bitmap of enabled LEDs: LED_1 = 0x02, LED_2 = 0x04, ... */
        struct sixaxis_led led[4];    /* LEDx at (4 - x) */
        struct sixaxis_led _reserved; /* LED5, not actually soldered */
} __packed;

union sixaxis_output_report_01 {
        struct sixaxis_output_report data;
        u8 buf[36];
};

struct motion_output_report_02 {
        u8 type, zero;
        u8 r, g, b;
        u8 zero2;
        u8 rumble;
};

#define DS4_FEATURE_REPORT_0x02_SIZE 37
#define DS4_FEATURE_REPORT_0x05_SIZE 41
#define DS4_FEATURE_REPORT_0x81_SIZE 7
#define DS4_FEATURE_REPORT_0xA3_SIZE 49
#define DS4_INPUT_REPORT_0x11_SIZE 78
#define DS4_OUTPUT_REPORT_0x05_SIZE 32
#define DS4_OUTPUT_REPORT_0x11_SIZE 78
#define SIXAXIS_REPORT_0xF2_SIZE 17
#define SIXAXIS_REPORT_0xF5_SIZE 8
#define MOTION_REPORT_0x02_SIZE 49

/* Offsets relative to USB input report (0x1). Bluetooth (0x11) requires an
 * additional +2.
 */
#define DS4_INPUT_REPORT_AXIS_OFFSET      1
#define DS4_INPUT_REPORT_BUTTON_OFFSET    5
#define DS4_INPUT_REPORT_TIMESTAMP_OFFSET 10
#define DS4_INPUT_REPORT_GYRO_X_OFFSET   13
#define DS4_INPUT_REPORT_BATTERY_OFFSET  30
#define DS4_INPUT_REPORT_TOUCHPAD_OFFSET 33

#define SENSOR_SUFFIX " Motion Sensors"
#define DS4_TOUCHPAD_SUFFIX " Touchpad"

/* Default to 4ms poll interval, which is same as USB (not adjustable). */
#define DS4_BT_DEFAULT_POLL_INTERVAL_MS 4
#define DS4_BT_MAX_POLL_INTERVAL_MS 62
#define DS4_GYRO_RES_PER_DEG_S 1024
#define DS4_ACC_RES_PER_G      8192

#define SIXAXIS_INPUT_REPORT_ACC_X_OFFSET 41
#define SIXAXIS_ACC_RES_PER_G 113

static DEFINE_SPINLOCK(sony_dev_list_lock);
static LIST_HEAD(sony_device_list);
static DEFINE_IDA(sony_device_id_allocator);

/* Used for calibration of DS4 accelerometer and gyro. */
struct ds4_calibration_data {
        int abs_code;
        short bias;
        /* Calibration requires scaling against a sensitivity value, which is a
         * float. Store sensitivity as a fraction to limit floating point
         * calculations until final calibration.
         */
        int sens_numer;
        int sens_denom;
};

enum ds4_dongle_state {
        DONGLE_DISCONNECTED,
        DONGLE_CALIBRATING,
        DONGLE_CONNECTED,
        DONGLE_DISABLED
};

enum sony_worker {
        SONY_WORKER_STATE,
        SONY_WORKER_HOTPLUG
};

struct sony_sc {
        spinlock_t lock;
        struct list_head list_node;
        struct hid_device *hdev;
        struct input_dev *touchpad;
        struct input_dev *sensor_dev;
        struct led_classdev *leds[MAX_LEDS];
        unsigned long quirks;
        struct work_struct hotplug_worker;
        struct work_struct state_worker;
        void (*send_output_report)(struct sony_sc *);
        struct power_supply *battery;
        struct power_supply_desc battery_desc;
        int device_id;
        unsigned fw_version;
        unsigned hw_version;
        u8 *output_report_dmabuf;

#ifdef CONFIG_SONY_FF
        u8 left;
        u8 right;
#endif

        u8 mac_address[6];
        u8 hotplug_worker_initialized;
        u8 state_worker_initialized;
        u8 defer_initialization;
        u8 cable_state;
        u8 battery_charging;
        u8 battery_capacity;
        u8 led_state[MAX_LEDS];
        u8 led_delay_on[MAX_LEDS];
        u8 led_delay_off[MAX_LEDS];
        u8 led_count;

        bool timestamp_initialized;
        u16 prev_timestamp;
        unsigned int timestamp_us;

        u8 ds4_bt_poll_interval;
        enum ds4_dongle_state ds4_dongle_state;
        /* DS4 calibration data */
        struct ds4_calibration_data ds4_calib_data[6];
};

static void sony_set_leds(struct sony_sc *sc);

static inline void sony_schedule_work(struct sony_sc *sc,
                                      enum sony_worker which)
{
        switch (which) {
        case SONY_WORKER_STATE:
                if (!sc->defer_initialization)
                        schedule_work(&sc->state_worker);
                break;
        case SONY_WORKER_HOTPLUG:
                if (sc->hotplug_worker_initialized)
                        schedule_work(&sc->hotplug_worker);
                break;
        }
}

static ssize_t ds4_show_poll_interval(struct device *dev,
                                struct device_attribute
                                *attr, char *buf)
{
        struct hid_device *hdev = to_hid_device(dev);
        struct sony_sc *sc = hid_get_drvdata(hdev);

        return snprintf(buf, PAGE_SIZE, "%i\n", sc->ds4_bt_poll_interval);
}

static ssize_t ds4_store_poll_interval(struct device *dev,
                                struct device_attribute *attr,
                                const char *buf, size_t count)
{
        struct hid_device *hdev = to_hid_device(dev);
        struct sony_sc *sc = hid_get_drvdata(hdev);
        unsigned long flags;
        u8 interval;

        if (kstrtou8(buf, 0, &interval))
                return -EINVAL;

        if (interval > DS4_BT_MAX_POLL_INTERVAL_MS)
                return -EINVAL;

        spin_lock_irqsave(&sc->lock, flags);
        sc->ds4_bt_poll_interval = interval;
        spin_unlock_irqrestore(&sc->lock, flags);

        sony_schedule_work(sc, SONY_WORKER_STATE);

        return count;
}

static DEVICE_ATTR(bt_poll_interval, 0644, ds4_show_poll_interval,
                ds4_store_poll_interval);

static ssize_t sony_show_firmware_version(struct device *dev,
                                struct device_attribute
                                *attr, char *buf)
{
        struct hid_device *hdev = to_hid_device(dev);
        struct sony_sc *sc = hid_get_drvdata(hdev);

        return snprintf(buf, PAGE_SIZE, "0x%04x\n", sc->fw_version);
}

static DEVICE_ATTR(firmware_version, 0444, sony_show_firmware_version, NULL);

static ssize_t sony_show_hardware_version(struct device *dev,
                                struct device_attribute
                                *attr, char *buf)
{
        struct hid_device *hdev = to_hid_device(dev);
        struct sony_sc *sc = hid_get_drvdata(hdev);

        return snprintf(buf, PAGE_SIZE, "0x%04x\n", sc->hw_version);
}

static DEVICE_ATTR(hardware_version, 0444, sony_show_hardware_version, NULL);

static u8 *motion_fixup(struct hid_device *hdev, u8 *rdesc,
                             unsigned int *rsize)
{
        *rsize = sizeof(motion_rdesc);
        return motion_rdesc;
}

static u8 *ps3remote_fixup(struct hid_device *hdev, u8 *rdesc,
                             unsigned int *rsize)
{
        *rsize = sizeof(ps3remote_rdesc);
        return ps3remote_rdesc;
}

static int ps3remote_mapping(struct hid_device *hdev, struct hid_input *hi,
                             struct hid_field *field, struct hid_usage *usage,
                             unsigned long **bit, int *max)
{
        unsigned int key = usage->hid & HID_USAGE;

        if ((usage->hid & HID_USAGE_PAGE) != HID_UP_BUTTON)
                return -1;

        switch (usage->collection_index) {
        case 1:
                if (key >= ARRAY_SIZE(ps3remote_keymap_joypad_buttons))
                        return -1;

                key = ps3remote_keymap_joypad_buttons[key];
                if (!key)
                        return -1;
                break;
        case 2:
                if (key >= ARRAY_SIZE(ps3remote_keymap_remote_buttons))
                        return -1;

                key = ps3remote_keymap_remote_buttons[key];
                if (!key)
                        return -1;
                break;
        default:
                return -1;
        }

        hid_map_usage_clear(hi, usage, bit, max, EV_KEY, key);
        return 1;
}

static int navigation_mapping(struct hid_device *hdev, struct hid_input *hi,
                          struct hid_field *field, struct hid_usage *usage,
                          unsigned long **bit, int *max)
{
        if ((usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON) {
                unsigned int key = usage->hid & HID_USAGE;

                if (key >= ARRAY_SIZE(sixaxis_keymap))
                        return -1;

                key = navigation_keymap[key];
                if (!key)
                        return -1;

                hid_map_usage_clear(hi, usage, bit, max, EV_KEY, key);
                return 1;
        } else if (usage->hid == HID_GD_POINTER) {
                /* See comment in sixaxis_mapping, basically the L2 (and R2)
                 * triggers are reported through GD Pointer.
                 * In addition we ignore any analog button 'axes' and only
                 * support digital buttons.
                 */
                switch (usage->usage_index) {
                case 8: /* L2 */
                        usage->hid = HID_GD_Z;
                        break;
                default:
                        return -1;
                }

                hid_map_usage_clear(hi, usage, bit, max, EV_ABS, usage->hid & 0xf);
                return 1;
        } else if ((usage->hid & HID_USAGE_PAGE) == HID_UP_GENDESK) {
                unsigned int abs = usage->hid & HID_USAGE;

                if (abs >= ARRAY_SIZE(navigation_absmap))
                        return -1;

                abs = navigation_absmap[abs];

                hid_map_usage_clear(hi, usage, bit, max, EV_ABS, abs);
                return 1;
        }

        return -1;
}


static int sixaxis_mapping(struct hid_device *hdev, struct hid_input *hi,
                          struct hid_field *field, struct hid_usage *usage,
                          unsigned long **bit, int *max)
{
        if ((usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON) {
                unsigned int key = usage->hid & HID_USAGE;

                if (key >= ARRAY_SIZE(sixaxis_keymap))
                        return -1;

                key = sixaxis_keymap[key];
                hid_map_usage_clear(hi, usage, bit, max, EV_KEY, key);
                return 1;
        } else if (usage->hid == HID_GD_POINTER) {
                /* The DS3 provides analog values for most buttons and even
                 * for HAT axes through GD Pointer. L2 and R2 are reported
                 * among these as well instead of as GD Z / RZ. Remap L2
                 * and R2 and ignore other analog 'button axes' as there is
                 * no good way for reporting them.
                 */
                switch (usage->usage_index) {
                case 8: /* L2 */
                        usage->hid = HID_GD_Z;
                        break;
                case 9: /* R2 */
                        usage->hid = HID_GD_RZ;
                        break;
                default:
                        return -1;
                }

                hid_map_usage_clear(hi, usage, bit, max, EV_ABS, usage->hid & 0xf);
                return 1;
        } else if ((usage->hid & HID_USAGE_PAGE) == HID_UP_GENDESK) {
                unsigned int abs = usage->hid & HID_USAGE;

                if (abs >= ARRAY_SIZE(sixaxis_absmap))
                        return -1;

                abs = sixaxis_absmap[abs];

                hid_map_usage_clear(hi, usage, bit, max, EV_ABS, abs);
                return 1;
        }

        return -1;
}

static int ds4_mapping(struct hid_device *hdev, struct hid_input *hi,
                       struct hid_field *field, struct hid_usage *usage,
                       unsigned long **bit, int *max)
{
        if ((usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON) {
                unsigned int key = usage->hid & HID_USAGE;

                if (key >= ARRAY_SIZE(ds4_keymap))
                        return -1;

                key = ds4_keymap[key];
                hid_map_usage_clear(hi, usage, bit, max, EV_KEY, key);
                return 1;
        } else if ((usage->hid & HID_USAGE_PAGE) == HID_UP_GENDESK) {
                unsigned int abs = usage->hid & HID_USAGE;

                /* Let the HID parser deal with the HAT. */
                if (usage->hid == HID_GD_HATSWITCH)
                        return 0;

                if (abs >= ARRAY_SIZE(ds4_absmap))
                        return -1;

                abs = ds4_absmap[abs];
                hid_map_usage_clear(hi, usage, bit, max, EV_ABS, abs);
                return 1;
        }

        return 0;
}

static u8 *sony_report_fixup(struct hid_device *hdev, u8 *rdesc,
                unsigned int *rsize)
{
        struct sony_sc *sc = hid_get_drvdata(hdev);

        if (sc->quirks & (SINO_LITE_CONTROLLER | FUTUREMAX_DANCE_MAT))
                return rdesc;

        /*
         * Some Sony RF receivers wrongly declare the mouse pointer as a
         * a constant non-data variable.
         */
        if ((sc->quirks & VAIO_RDESC_CONSTANT) && *rsize >= 56 &&
            /* usage page: generic desktop controls */
            /* rdesc[0] == 0x05 && rdesc[1] == 0x01 && */
            /* usage: mouse */
            rdesc[2] == 0x09 && rdesc[3] == 0x02 &&
            /* input (usage page for x,y axes): constant, variable, relative */
            rdesc[54] == 0x81 && rdesc[55] == 0x07) {
                hid_info(hdev, "Fixing up Sony RF Receiver report descriptor\n");
                /* input: data, variable, relative */
                rdesc[55] = 0x06;
        }

        if (sc->quirks & MOTION_CONTROLLER)
                return motion_fixup(hdev, rdesc, rsize);

        if (sc->quirks & PS3REMOTE)
                return ps3remote_fixup(hdev, rdesc, rsize);

        return rdesc;
}

static void sixaxis_parse_report(struct sony_sc *sc, u8 *rd, int size)
{
        static const u8 sixaxis_battery_capacity[] = { 0, 1, 25, 50, 75, 100 };
        unsigned long flags;
        int offset;
        u8 cable_state, battery_capacity, battery_charging;

        /*
         * The sixaxis is charging if the battery value is 0xee
         * and it is fully charged if the value is 0xef.
         * It does not report the actual level while charging so it
         * is set to 100% while charging is in progress.
         */
        offset = (sc->quirks & MOTION_CONTROLLER) ? 12 : 30;

        if (rd[offset] >= 0xee) {
                battery_capacity = 100;
                battery_charging = !(rd[offset] & 0x01);
                cable_state = 1;
        } else {
                u8 index = rd[offset] <= 5 ? rd[offset] : 5;
                battery_capacity = sixaxis_battery_capacity[index];
                battery_charging = 0;
                cable_state = 0;
        }

        spin_lock_irqsave(&sc->lock, flags);
        sc->cable_state = cable_state;
        sc->battery_capacity = battery_capacity;
        sc->battery_charging = battery_charging;
        spin_unlock_irqrestore(&sc->lock, flags);

        if (sc->quirks & SIXAXIS_CONTROLLER) {
                int val;

                offset = SIXAXIS_INPUT_REPORT_ACC_X_OFFSET;
                val = ((rd[offset+1] << 8) | rd[offset]) - 511;
                input_report_abs(sc->sensor_dev, ABS_X, val);

                /* Y and Z are swapped and inversed */
                val = 511 - ((rd[offset+5] << 8) | rd[offset+4]);
                input_report_abs(sc->sensor_dev, ABS_Y, val);

                val = 511 - ((rd[offset+3] << 8) | rd[offset+2]);
                input_report_abs(sc->sensor_dev, ABS_Z, val);

                input_sync(sc->sensor_dev);
        }
}

static void dualshock4_parse_report(struct sony_sc *sc, u8 *rd, int size)
{
        struct hid_input *hidinput = list_entry(sc->hdev->inputs.next,
                                                struct hid_input, list);
        struct input_dev *input_dev = hidinput->input;
        unsigned long flags;
        int n, m, offset, num_touch_data, max_touch_data;
        u8 cable_state, battery_capacity, battery_charging;
        u16 timestamp;

        /* When using Bluetooth the header is 2 bytes longer, so skip these. */
        int data_offset = (sc->quirks & DUALSHOCK4_CONTROLLER_BT) ? 2 : 0;

        /* Second bit of third button byte is for the touchpad button. */
        offset = data_offset + DS4_INPUT_REPORT_BUTTON_OFFSET;
        input_report_key(sc->touchpad, BTN_LEFT, rd[offset+2] & 0x2);

        /*
         * The default behavior of the Dualshock 4 is to send reports using
         * report type 1 when running over Bluetooth. However, when feature
         * report 2 is requested during the controller initialization it starts
         * sending input reports in report 17. Since report 17 is undefined
         * in the default HID descriptor, the HID layer won't generate events.
         * While it is possible (and this was done before) to fixup the HID
         * descriptor to add this mapping, it was better to do this manually.
         * The reason is there were various pieces software both open and closed
         * source, relying on the descriptors to be the same across various
         * operating systems. If the descriptors wouldn't match some
         * applications e.g. games on Wine would not be able to function due
         * to different descriptors, which such applications are not parsing.
         */
        if (rd[0] == 17) {
                int value;

                offset = data_offset + DS4_INPUT_REPORT_AXIS_OFFSET;
                input_report_abs(input_dev, ABS_X, rd[offset]);
                input_report_abs(input_dev, ABS_Y, rd[offset+1]);
                input_report_abs(input_dev, ABS_RX, rd[offset+2]);
                input_report_abs(input_dev, ABS_RY, rd[offset+3]);

                value = rd[offset+4] & 0xf;
                if (value > 7)
                        value = 8; /* Center 0, 0 */
                input_report_abs(input_dev, ABS_HAT0X, ds4_hat_mapping[value].x);
                input_report_abs(input_dev, ABS_HAT0Y, ds4_hat_mapping[value].y);

                input_report_key(input_dev, BTN_WEST, rd[offset+4] & 0x10);
                input_report_key(input_dev, BTN_SOUTH, rd[offset+4] & 0x20);
                input_report_key(input_dev, BTN_EAST, rd[offset+4] & 0x40);
                input_report_key(input_dev, BTN_NORTH, rd[offset+4] & 0x80);

                input_report_key(input_dev, BTN_TL, rd[offset+5] & 0x1);
                input_report_key(input_dev, BTN_TR, rd[offset+5] & 0x2);
                input_report_key(input_dev, BTN_TL2, rd[offset+5] & 0x4);
                input_report_key(input_dev, BTN_TR2, rd[offset+5] & 0x8);
                input_report_key(input_dev, BTN_SELECT, rd[offset+5] & 0x10);
                input_report_key(input_dev, BTN_START, rd[offset+5] & 0x20);
                input_report_key(input_dev, BTN_THUMBL, rd[offset+5] & 0x40);
                input_report_key(input_dev, BTN_THUMBR, rd[offset+5] & 0x80);

                input_report_key(input_dev, BTN_MODE, rd[offset+6] & 0x1);

                input_report_abs(input_dev, ABS_Z, rd[offset+7]);
                input_report_abs(input_dev, ABS_RZ, rd[offset+8]);

                input_sync(input_dev);
        }

        /* Convert timestamp (in 5.33us unit) to timestamp_us */
        offset = data_offset + DS4_INPUT_REPORT_TIMESTAMP_OFFSET;
        timestamp = get_unaligned_le16(&rd[offset]);
        if (!sc->timestamp_initialized) {
                sc->timestamp_us = ((unsigned int)timestamp * 16) / 3;
                sc->timestamp_initialized = true;
        } else {
                u16 delta;

                if (sc->prev_timestamp > timestamp)
                        delta = (U16_MAX - sc->prev_timestamp + timestamp + 1);
                else

                        delta = timestamp - sc->prev_timestamp;
                sc->timestamp_us += (delta * 16) / 3;
        }
        sc->prev_timestamp = timestamp;
        input_event(sc->sensor_dev, EV_MSC, MSC_TIMESTAMP, sc->timestamp_us);

        offset = data_offset + DS4_INPUT_REPORT_GYRO_X_OFFSET;
        for (n = 0; n < 6; n++) {
                /* Store data in int for more precision during mult_frac. */
                int raw_data = (short)((rd[offset+1] << 8) | rd[offset]);
                struct ds4_calibration_data *calib = &sc->ds4_calib_data[n];

                /* High precision is needed during calibration, but the
                 * calibrated values are within 32-bit.
                 * Note: we swap numerator 'x' and 'numer' in mult_frac for
                 *       precision reasons so we don't need 64-bit.
                 */
                int calib_data = mult_frac(calib->sens_numer,
                                           raw_data - calib->bias,
                                           calib->sens_denom);

                input_report_abs(sc->sensor_dev, calib->abs_code, calib_data);
                offset += 2;
        }
        input_sync(sc->sensor_dev);

        /*
         * The lower 4 bits of byte 30 (or 32 for BT) contain the battery level
         * and the 5th bit contains the USB cable state.
         */
        offset = data_offset + DS4_INPUT_REPORT_BATTERY_OFFSET;
        cable_state = (rd[offset] >> 4) & 0x01;
        battery_capacity = rd[offset] & 0x0F;

        /*
         * When a USB power source is connected the battery level ranges from
         * 0 to 10, and when running on battery power it ranges from 0 to 9.
         * A battery level above 10 when plugged in means charge completed.
         */
        if (!cable_state || battery_capacity > 10)
                battery_charging = 0;
        else
                battery_charging = 1;

        if (!cable_state)
                battery_capacity++;
        if (battery_capacity > 10)
                battery_capacity = 10;

        battery_capacity *= 10;

        spin_lock_irqsave(&sc->lock, flags);
        sc->cable_state = cable_state;
        sc->battery_capacity = battery_capacity;
        sc->battery_charging = battery_charging;
        spin_unlock_irqrestore(&sc->lock, flags);

        /*
         * The Dualshock 4 multi-touch trackpad data starts at offset 33 on USB
         * and 35 on Bluetooth.
         * The first byte indicates the number of touch data in the report.
         * Trackpad data starts 2 bytes later (e.g. 35 for USB).
         */
        offset = data_offset + DS4_INPUT_REPORT_TOUCHPAD_OFFSET;
        max_touch_data = (sc->quirks & DUALSHOCK4_CONTROLLER_BT) ? 4 : 3;
        if (rd[offset] > 0 && rd[offset] <= max_touch_data)
                num_touch_data = rd[offset];
        else
                num_touch_data = 1;
        offset += 1;

        for (m = 0; m < num_touch_data; m++) {
                /* Skip past timestamp */
                offset += 1;

                /*
                 * The first 7 bits of the first byte is a counter and bit 8 is
                 * a touch indicator that is 0 when pressed and 1 when not
                 * pressed.
                 * The next 3 bytes are two 12 bit touch coordinates, X and Y.
                 * The data for the second touch is in the same format and
                 * immediately follows the data for the first.
                 */
                for (n = 0; n < 2; n++) {
                        u16 x, y;
                        bool active;

                        x = rd[offset+1] | ((rd[offset+2] & 0xF) << 8);
                        y = ((rd[offset+2] & 0xF0) >> 4) | (rd[offset+3] << 4);

                        active = !(rd[offset] >> 7);
                        input_mt_slot(sc->touchpad, n);
                        input_mt_report_slot_state(sc->touchpad, MT_TOOL_FINGER, active);

                        if (active) {
                                input_report_abs(sc->touchpad, ABS_MT_POSITION_X, x);
                                input_report_abs(sc->touchpad, ABS_MT_POSITION_Y, y);
                        }

                        offset += 4;
                }
                input_mt_sync_frame(sc->touchpad);
                input_sync(sc->touchpad);
        }
}

static void nsg_mrxu_parse_report(struct sony_sc *sc, u8 *rd, int size)
{
        int n, offset, relx, rely;
        u8 active;

        /*
         * The NSG-MRxU multi-touch trackpad data starts at offset 1 and
         *   the touch-related data starts at offset 2.
         * For the first byte, bit 0 is set when touchpad button is pressed.
         * Bit 2 is set when a touch is active and the drag (Fn) key is pressed.
         * This drag key is mapped to BTN_LEFT.  It is operational only when a 
         *   touch point is active.
         * Bit 4 is set when only the first touch point is active.
         * Bit 6 is set when only the second touch point is active.
         * Bits 5 and 7 are set when both touch points are active.
         * The next 3 bytes are two 12 bit X/Y coordinates for the first touch.
         * The following byte, offset 5, has the touch width and length.
         *   Bits 0-4=X (width), bits 5-7=Y (length).
         * A signed relative X coordinate is at offset 6.
         * The bytes at offset 7-9 are the second touch X/Y coordinates.
         * Offset 10 has the second touch width and length.
         * Offset 11 has the relative Y coordinate.
         */
        offset = 1;

        input_report_key(sc->touchpad, BTN_LEFT, rd[offset] & 0x0F);
        active = (rd[offset] >> 4);
        relx = (s8) rd[offset+5];
        rely = ((s8) rd[offset+10]) * -1;

        offset++;

        for (n = 0; n < 2; n++) {
                u16 x, y;
                u8 contactx, contacty;

                x = rd[offset] | ((rd[offset+1] & 0x0F) << 8);
                y = ((rd[offset+1] & 0xF0) >> 4) | (rd[offset+2] << 4);

                input_mt_slot(sc->touchpad, n);
                input_mt_report_slot_state(sc->touchpad, MT_TOOL_FINGER, active & 0x03);

                if (active & 0x03) {
                        contactx = rd[offset+3] & 0x0F;
                        contacty = rd[offset+3] >> 4;
                        input_report_abs(sc->touchpad, ABS_MT_TOUCH_MAJOR,
                                max(contactx, contacty));
                        input_report_abs(sc->touchpad, ABS_MT_TOUCH_MINOR,
                                min(contactx, contacty));
                        input_report_abs(sc->touchpad, ABS_MT_ORIENTATION,
                                (bool) (contactx > contacty));
                        input_report_abs(sc->touchpad, ABS_MT_POSITION_X, x);
                        input_report_abs(sc->touchpad, ABS_MT_POSITION_Y,
                                NSG_MRXU_MAX_Y - y);
                        /*
                         * The relative coordinates belong to the first touch
                         * point, when present, or to the second touch point
                         * when the first is not active.
                         */
                        if ((n == 0) || ((n == 1) && (active & 0x01))) {
                                input_report_rel(sc->touchpad, REL_X, relx);
                                input_report_rel(sc->touchpad, REL_Y, rely);
                        }
                }

                offset += 5;
                active >>= 2;
        }

        input_mt_sync_frame(sc->touchpad);

        input_sync(sc->touchpad);
}

static int sony_raw_event(struct hid_device *hdev, struct hid_report *report,
                u8 *rd, int size)
{
        struct sony_sc *sc = hid_get_drvdata(hdev);

        /*
         * Sixaxis HID report has acclerometers/gyro with MSByte first, this
         * has to be BYTE_SWAPPED before passing up to joystick interface
         */
        if ((sc->quirks & SIXAXIS_CONTROLLER) && rd[0] == 0x01 && size == 49) {
                /*
                 * When connected via Bluetooth the Sixaxis occasionally sends
                 * a report with the second byte 0xff and the rest zeroed.
                 *
                 * This report does not reflect the actual state of the
                 * controller must be ignored to avoid generating false input
                 * events.
                 */
                if (rd[1] == 0xff)
                        return -EINVAL;

                swap(rd[41], rd[42]);
                swap(rd[43], rd[44]);
                swap(rd[45], rd[46]);
                swap(rd[47], rd[48]);

                sixaxis_parse_report(sc, rd, size);
        } else if ((sc->quirks & MOTION_CONTROLLER_BT) && rd[0] == 0x01 && size == 49) {
                sixaxis_parse_report(sc, rd, size);
        } else if ((sc->quirks & NAVIGATION_CONTROLLER) && rd[0] == 0x01 &&
                        size == 49) {
                sixaxis_parse_report(sc, rd, size);
        } else if ((sc->quirks & DUALSHOCK4_CONTROLLER_USB) && rd[0] == 0x01 &&
                        size == 64) {
                dualshock4_parse_report(sc, rd, size);
        } else if (((sc->quirks & DUALSHOCK4_CONTROLLER_BT) && rd[0] == 0x11 &&
                        size == 78)) {
                /* CRC check */
                u8 bthdr = 0xA1;
                u32 crc;
                u32 report_crc;

                crc = crc32_le(0xFFFFFFFF, &bthdr, 1);
                crc = ~crc32_le(crc, rd, DS4_INPUT_REPORT_0x11_SIZE-4);
                report_crc = get_unaligned_le32(&rd[DS4_INPUT_REPORT_0x11_SIZE-4]);
                if (crc != report_crc) {
                        hid_dbg(sc->hdev, "DualShock 4 input report's CRC check failed, received crc 0x%0x != 0x%0x\n",
                                report_crc, crc);
                        return -EILSEQ;
                }

                dualshock4_parse_report(sc, rd, size);
        } else if ((sc->quirks & DUALSHOCK4_DONGLE) && rd[0] == 0x01 &&
                        size == 64) {
                unsigned long flags;
                enum ds4_dongle_state dongle_state;

                /*
                 * In the case of a DS4 USB dongle, bit[2] of byte 31 indicates
                 * if a DS4 is actually connected (indicated by '0').
                 * For non-dongle, this bit is always 0 (connected).
                 */
                bool connected = (rd[31] & 0x04) ? false : true;

                spin_lock_irqsave(&sc->lock, flags);
                dongle_state = sc->ds4_dongle_state;
                spin_unlock_irqrestore(&sc->lock, flags);

                /*
                 * The dongle always sends input reports even when no
                 * DS4 is attached. When a DS4 is connected, we need to
                 * obtain calibration data before we can use it.
                 * The code below tracks dongle state and kicks of
                 * calibration when needed and only allows us to process
                 * input if a DS4 is actually connected.
                 */
                if (dongle_state == DONGLE_DISCONNECTED && connected) {
                        hid_info(sc->hdev, "DualShock 4 USB dongle: controller connected\n");
                        sony_set_leds(sc);

                        spin_lock_irqsave(&sc->lock, flags);
                        sc->ds4_dongle_state = DONGLE_CALIBRATING;
                        spin_unlock_irqrestore(&sc->lock, flags);

                        sony_schedule_work(sc, SONY_WORKER_HOTPLUG);

                        /* Don't process the report since we don't have
                         * calibration data, but let hidraw have it anyway.
                         */
                        return 0;
                } else if ((dongle_state == DONGLE_CONNECTED ||
                            dongle_state == DONGLE_DISABLED) && !connected) {
                        hid_info(sc->hdev, "DualShock 4 USB dongle: controller disconnected\n");

                        spin_lock_irqsave(&sc->lock, flags);
                        sc->ds4_dongle_state = DONGLE_DISCONNECTED;
                        spin_unlock_irqrestore(&sc->lock, flags);

                        /* Return 0, so hidraw can get the report. */
                        return 0;
                } else if (dongle_state == DONGLE_CALIBRATING ||
                           dongle_state == DONGLE_DISABLED ||
                           dongle_state == DONGLE_DISCONNECTED) {
                        /* Return 0, so hidraw can get the report. */
                        return 0;
                }

                dualshock4_parse_report(sc, rd, size);

        } else if ((sc->quirks & NSG_MRXU_REMOTE) && rd[0] == 0x02) {
                nsg_mrxu_parse_report(sc, rd, size);
                return 1;
        }

        if (sc->defer_initialization) {
                sc->defer_initialization = 0;
                sony_schedule_work(sc, SONY_WORKER_STATE);
        }

        return 0;
}

static int sony_mapping(struct hid_device *hdev, struct hid_input *hi,
                        struct hid_field *field, struct hid_usage *usage,
                        unsigned long **bit, int *max)
{
        struct sony_sc *sc = hid_get_drvdata(hdev);

        if (sc->quirks & BUZZ_CONTROLLER) {
                unsigned int key = usage->hid & HID_USAGE;

                if ((usage->hid & HID_USAGE_PAGE) != HID_UP_BUTTON)
                        return -1;

                switch (usage->collection_index) {
                case 1:
                        if (key >= ARRAY_SIZE(buzz_keymap))
                                return -1;

                        key = buzz_keymap[key];
                        if (!key)
                                return -1;
                        break;
                default:
                        return -1;
                }

                hid_map_usage_clear(hi, usage, bit, max, EV_KEY, key);
                return 1;
        }

        if (sc->quirks & PS3REMOTE)
                return ps3remote_mapping(hdev, hi, field, usage, bit, max);

        if (sc->quirks & NAVIGATION_CONTROLLER)
                return navigation_mapping(hdev, hi, field, usage, bit, max);

        if (sc->quirks & SIXAXIS_CONTROLLER)
                return sixaxis_mapping(hdev, hi, field, usage, bit, max);

        if (sc->quirks & DUALSHOCK4_CONTROLLER)
                return ds4_mapping(hdev, hi, field, usage, bit, max);


        /* Let hid-core decide for the others */
        return 0;
}

static int sony_register_touchpad(struct sony_sc *sc, int touch_count,
                int w, int h, int touch_major, int touch_minor, int orientation)
{
        size_t name_sz;
        char *name;
        int ret;

        sc->touchpad = input_allocate_device();
        if (!sc->touchpad)
                return -ENOMEM;

        input_set_drvdata(sc->touchpad, sc);
        sc->touchpad->dev.parent = &sc->hdev->dev;
        sc->touchpad->phys = sc->hdev->phys;
        sc->touchpad->uniq = sc->hdev->uniq;
        sc->touchpad->id.bustype = sc->hdev->bus;
        sc->touchpad->id.vendor = sc->hdev->vendor;
        sc->touchpad->id.product = sc->hdev->product;
        sc->touchpad->id.version = sc->hdev->version;

        /* Append a suffix to the controller name as there are various
         * DS4 compatible non-Sony devices with different names.
         */
        name_sz = strlen(sc->hdev->name) + sizeof(DS4_TOUCHPAD_SUFFIX);
        name = kzalloc(name_sz, GFP_KERNEL);
        if (!name) {
                ret = -ENOMEM;
                goto err;
        }
        snprintf(name, name_sz, "%s" DS4_TOUCHPAD_SUFFIX, sc->hdev->name);
        sc->touchpad->name = name;

        /* We map the button underneath the touchpad to BTN_LEFT. */
        __set_bit(EV_KEY, sc->touchpad->evbit);
        __set_bit(BTN_LEFT, sc->touchpad->keybit);
        __set_bit(INPUT_PROP_BUTTONPAD, sc->touchpad->propbit);

        input_set_abs_params(sc->touchpad, ABS_MT_POSITION_X, 0, w, 0, 0);
        input_set_abs_params(sc->touchpad, ABS_MT_POSITION_Y, 0, h, 0, 0);

        if (touch_major > 0) {
                input_set_abs_params(sc->touchpad, ABS_MT_TOUCH_MAJOR, 
                        0, touch_major, 0, 0);
                if (touch_minor > 0)
                        input_set_abs_params(sc->touchpad, ABS_MT_TOUCH_MINOR, 
                                0, touch_minor, 0, 0);
                if (orientation > 0)
                        input_set_abs_params(sc->touchpad, ABS_MT_ORIENTATION, 
                                0, orientation, 0, 0);
        }

        if (sc->quirks & NSG_MRXU_REMOTE) {
                __set_bit(EV_REL, sc->touchpad->evbit);
        }

        ret = input_mt_init_slots(sc->touchpad, touch_count, INPUT_MT_POINTER);
        if (ret < 0)
                goto err;

        ret = input_register_device(sc->touchpad);
        if (ret < 0)
                goto err;

        return 0;

err:
        kfree(sc->touchpad->name);
        sc->touchpad->name = NULL;

        input_free_device(sc->touchpad);
        sc->touchpad = NULL;

        return ret;
}

static void sony_unregister_touchpad(struct sony_sc *sc)
{
        if (!sc->touchpad)
                return;

        kfree(sc->touchpad->name);
        sc->touchpad->name = NULL;

        input_unregister_device(sc->touchpad);
        sc->touchpad = NULL;
}

static int sony_register_sensors(struct sony_sc *sc)
{
        size_t name_sz;
        char *name;
        int ret;
        int range;

        sc->sensor_dev = input_allocate_device();
        if (!sc->sensor_dev)
                return -ENOMEM;

        input_set_drvdata(sc->sensor_dev, sc);
        sc->sensor_dev->dev.parent = &sc->hdev->dev;
        sc->sensor_dev->phys = sc->hdev->phys;
        sc->sensor_dev->uniq = sc->hdev->uniq;
        sc->sensor_dev->id.bustype = sc->hdev->bus;
        sc->sensor_dev->id.vendor = sc->hdev->vendor;
        sc->sensor_dev->id.product = sc->hdev->product;
        sc->sensor_dev->id.version = sc->hdev->version;

        /* Append a suffix to the controller name as there are various
         * DS4 compatible non-Sony devices with different names.
         */
        name_sz = strlen(sc->hdev->name) + sizeof(SENSOR_SUFFIX);
        name = kzalloc(name_sz, GFP_KERNEL);
        if (!name) {
                ret = -ENOMEM;
                goto err;
        }
        snprintf(name, name_sz, "%s" SENSOR_SUFFIX, sc->hdev->name);
        sc->sensor_dev->name = name;

        if (sc->quirks & SIXAXIS_CONTROLLER) {
                /* For the DS3 we only support the accelerometer, which works
                 * quite well even without calibration. The device also has
                 * a 1-axis gyro, but it is very difficult to manage from within
                 * the driver even to get data, the sensor is inaccurate and
                 * the behavior is very different between hardware revisions.
                 */
                input_set_abs_params(sc->sensor_dev, ABS_X, -512, 511, 4, 0);
                input_set_abs_params(sc->sensor_dev, ABS_Y, -512, 511, 4, 0);
                input_set_abs_params(sc->sensor_dev, ABS_Z, -512, 511, 4, 0);
                input_abs_set_res(sc->sensor_dev, ABS_X, SIXAXIS_ACC_RES_PER_G);
                input_abs_set_res(sc->sensor_dev, ABS_Y, SIXAXIS_ACC_RES_PER_G);
                input_abs_set_res(sc->sensor_dev, ABS_Z, SIXAXIS_ACC_RES_PER_G);
        } else if (sc->quirks & DUALSHOCK4_CONTROLLER) {
                range = DS4_ACC_RES_PER_G*4;
                input_set_abs_params(sc->sensor_dev, ABS_X, -range, range, 16, 0);
                input_set_abs_params(sc->sensor_dev, ABS_Y, -range, range, 16, 0);
                input_set_abs_params(sc->sensor_dev, ABS_Z, -range, range, 16, 0);
                input_abs_set_res(sc->sensor_dev, ABS_X, DS4_ACC_RES_PER_G);
                input_abs_set_res(sc->sensor_dev, ABS_Y, DS4_ACC_RES_PER_G);
                input_abs_set_res(sc->sensor_dev, ABS_Z, DS4_ACC_RES_PER_G);

                range = DS4_GYRO_RES_PER_DEG_S*2048;
                input_set_abs_params(sc->sensor_dev, ABS_RX, -range, range, 16, 0);
                input_set_abs_params(sc->sensor_dev, ABS_RY, -range, range, 16, 0);
                input_set_abs_params(sc->sensor_dev, ABS_RZ, -range, range, 16, 0);
                input_abs_set_res(sc->sensor_dev, ABS_RX, DS4_GYRO_RES_PER_DEG_S);
                input_abs_set_res(sc->sensor_dev, ABS_RY, DS4_GYRO_RES_PER_DEG_S);
                input_abs_set_res(sc->sensor_dev, ABS_RZ, DS4_GYRO_RES_PER_DEG_S);

                __set_bit(EV_MSC, sc->sensor_dev->evbit);
                __set_bit(MSC_TIMESTAMP, sc->sensor_dev->mscbit);
        }

        __set_bit(INPUT_PROP_ACCELEROMETER, sc->sensor_dev->propbit);

        ret = input_register_device(sc->sensor_dev);
        if (ret < 0)
                goto err;

        return 0;

err:
        kfree(sc->sensor_dev->name);
        sc->sensor_dev->name = NULL;

        input_free_device(sc->sensor_dev);
        sc->sensor_dev = NULL;

        return ret;
}

static void sony_unregister_sensors(struct sony_sc *sc)
{
        if (!sc->sensor_dev)
                return;

        kfree(sc->sensor_dev->name);
        sc->sensor_dev->name = NULL;

        input_unregister_device(sc->sensor_dev);
        sc->sensor_dev = NULL;
}


/*
 * Sending HID_REQ_GET_REPORT changes the operation mode of the ps3 controller
 * to "operational".  Without this, the ps3 controller will not report any
 * events.
 */
static int sixaxis_set_operational_usb(struct hid_device *hdev)
{
        const int buf_size =
                max(SIXAXIS_REPORT_0xF2_SIZE, SIXAXIS_REPORT_0xF5_SIZE);
        u8 *buf;
        int ret;

        buf = kmalloc(buf_size, GFP_KERNEL);
        if (!buf)
                return -ENOMEM;

        ret = hid_hw_raw_request(hdev, 0xf2, buf, SIXAXIS_REPORT_0xF2_SIZE,
                                 HID_FEATURE_REPORT, HID_REQ_GET_REPORT);
        if (ret < 0) {
                hid_err(hdev, "can't set operational mode: step 1\n");
                goto out;
        }

        /*
         * Some compatible controllers like the Speedlink Strike FX and
         * Gasia need another query plus an USB interrupt to get operational.
         */
        ret = hid_hw_raw_request(hdev, 0xf5, buf, SIXAXIS_REPORT_0xF5_SIZE,
                                 HID_FEATURE_REPORT, HID_REQ_GET_REPORT);
        if (ret < 0) {
                hid_err(hdev, "can't set operational mode: step 2\n");
                goto out;
        }

        /*
         * But the USB interrupt would cause SHANWAN controllers to
         * start rumbling non-stop.
         */
        if (strcmp(hdev->name, "SHANWAN PS3 GamePad")) {
                ret = hid_hw_output_report(hdev, buf, 1);
                if (ret < 0) {
                        hid_info(hdev, "can't set operational mode: step 3, ignoring\n");
                        ret = 0;
                }
        }

out:
        kfree(buf);

        return ret;
}

static int sixaxis_set_operational_bt(struct hid_device *hdev)
{
        static const u8 report[] = { 0xf4, 0x42, 0x03, 0x00, 0x00 };
        u8 *buf;
        int ret;

        buf = kmemdup(report, sizeof(report), GFP_KERNEL);
        if (!buf)
                return -ENOMEM;

        ret = hid_hw_raw_request(hdev, buf[0], buf, sizeof(report),
                                  HID_FEATURE_REPORT, HID_REQ_SET_REPORT);

        kfree(buf);

        return ret;
}

/*
 * Request DS4 calibration data for the motion sensors.
 * For Bluetooth this also affects the operating mode (see below).
 */
static int dualshock4_get_calibration_data(struct sony_sc *sc)
{
        u8 *buf;
        int ret;
        short gyro_pitch_bias, gyro_pitch_plus, gyro_pitch_minus;
        short gyro_yaw_bias, gyro_yaw_plus, gyro_yaw_minus;
        short gyro_roll_bias, gyro_roll_plus, gyro_roll_minus;
        short gyro_speed_plus, gyro_speed_minus;
        short acc_x_plus, acc_x_minus;
        short acc_y_plus, acc_y_minus;
        short acc_z_plus, acc_z_minus;
        int speed_2x;
        int range_2g;

        /* For Bluetooth we use a different request, which supports CRC.
         * Note: in Bluetooth mode feature report 0x02 also changes the state
         * of the controller, so that it sends input reports of type 0x11.
         */
        if (sc->quirks & (DUALSHOCK4_CONTROLLER_USB | DUALSHOCK4_DONGLE)) {
                buf = kmalloc(DS4_FEATURE_REPORT_0x02_SIZE, GFP_KERNEL);
                if (!buf)
                        return -ENOMEM;

                ret = hid_hw_raw_request(sc->hdev, 0x02, buf,
                                         DS4_FEATURE_REPORT_0x02_SIZE,
                                         HID_FEATURE_REPORT,
                                         HID_REQ_GET_REPORT);
                if (ret < 0)
                        goto err_stop;
        } else {
                u8 bthdr = 0xA3;
                u32 crc;
                u32 report_crc;
                int retries;

                buf = kmalloc(DS4_FEATURE_REPORT_0x05_SIZE, GFP_KERNEL);
                if (!buf)
                        return -ENOMEM;

                for (retries = 0; retries < 3; retries++) {
                        ret = hid_hw_raw_request(sc->hdev, 0x05, buf,
                                                 DS4_FEATURE_REPORT_0x05_SIZE,
                                                 HID_FEATURE_REPORT,
                                                 HID_REQ_GET_REPORT);
                        if (ret < 0)
                                goto err_stop;

                        /* CRC check */
                        crc = crc32_le(0xFFFFFFFF, &bthdr, 1);
                        crc = ~crc32_le(crc, buf, DS4_FEATURE_REPORT_0x05_SIZE-4);
                        report_crc = get_unaligned_le32(&buf[DS4_FEATURE_REPORT_0x05_SIZE-4]);
                        if (crc != report_crc) {
                                hid_warn(sc->hdev, "DualShock 4 calibration report's CRC check failed, received crc 0x%0x != 0x%0x\n",
                                        report_crc, crc);
                                if (retries < 2) {
                                        hid_warn(sc->hdev, "Retrying DualShock 4 get calibration report request\n");
                                        continue;
                                } else {
                                        ret = -EILSEQ;
                                        goto err_stop;
                                }
                        } else {
                                break;
                        }
                }
        }

        gyro_pitch_bias  = get_unaligned_le16(&buf[1]);
        gyro_yaw_bias    = get_unaligned_le16(&buf[3]);
        gyro_roll_bias   = get_unaligned_le16(&buf[5]);
        if (sc->quirks & DUALSHOCK4_CONTROLLER_USB) {
                gyro_pitch_plus  = get_unaligned_le16(&buf[7]);
                gyro_pitch_minus = get_unaligned_le16(&buf[9]);
                gyro_yaw_plus    = get_unaligned_le16(&buf[11]);
                gyro_yaw_minus   = get_unaligned_le16(&buf[13]);
                gyro_roll_plus   = get_unaligned_le16(&buf[15]);
                gyro_roll_minus  = get_unaligned_le16(&buf[17]);
        } else {
                /* BT + Dongle */
                gyro_pitch_plus  = get_unaligned_le16(&buf[7]);
                gyro_yaw_plus    = get_unaligned_le16(&buf[9]);
                gyro_roll_plus   = get_unaligned_le16(&buf[11]);
                gyro_pitch_minus = get_unaligned_le16(&buf[13]);
                gyro_yaw_minus   = get_unaligned_le16(&buf[15]);
                gyro_roll_minus  = get_unaligned_le16(&buf[17]);
        }
        gyro_speed_plus  = get_unaligned_le16(&buf[19]);
        gyro_speed_minus = get_unaligned_le16(&buf[21]);
        acc_x_plus       = get_unaligned_le16(&buf[23]);
        acc_x_minus      = get_unaligned_le16(&buf[25]);
        acc_y_plus       = get_unaligned_le16(&buf[27]);
        acc_y_minus      = get_unaligned_le16(&buf[29]);
        acc_z_plus       = get_unaligned_le16(&buf[31]);
        acc_z_minus      = get_unaligned_le16(&buf[33]);

        /* Set gyroscope calibration and normalization parameters.
         * Data values will be normalized to 1/DS4_GYRO_RES_PER_DEG_S degree/s.
         */
        speed_2x = (gyro_speed_plus + gyro_speed_minus);
        sc->ds4_calib_data[0].abs_code = ABS_RX;
        sc->ds4_calib_data[0].bias = gyro_pitch_bias;
        sc->ds4_calib_data[0].sens_numer = speed_2x*DS4_GYRO_RES_PER_DEG_S;
        sc->ds4_calib_data[0].sens_denom = gyro_pitch_plus - gyro_pitch_minus;

        sc->ds4_calib_data[1].abs_code = ABS_RY;
        sc->ds4_calib_data[1].bias = gyro_yaw_bias;
        sc->ds4_calib_data[1].sens_numer = speed_2x*DS4_GYRO_RES_PER_DEG_S;
        sc->ds4_calib_data[1].sens_denom = gyro_yaw_plus - gyro_yaw_minus;

        sc->ds4_calib_data[2].abs_code = ABS_RZ;
        sc->ds4_calib_data[2].bias = gyro_roll_bias;
        sc->ds4_calib_data[2].sens_numer = speed_2x*DS4_GYRO_RES_PER_DEG_S;
        sc->ds4_calib_data[2].sens_denom = gyro_roll_plus - gyro_roll_minus;

        /* Set accelerometer calibration and normalization parameters.
         * Data values will be normalized to 1/DS4_ACC_RES_PER_G G.
         */
        range_2g = acc_x_plus - acc_x_minus;
        sc->ds4_calib_data[3].abs_code = ABS_X;
        sc->ds4_calib_data[3].bias = acc_x_plus - range_2g / 2;
        sc->ds4_calib_data[3].sens_numer = 2*DS4_ACC_RES_PER_G;
        sc->ds4_calib_data[3].sens_denom = range_2g;

        range_2g = acc_y_plus - acc_y_minus;
        sc->ds4_calib_data[4].abs_code = ABS_Y;
        sc->ds4_calib_data[4].bias = acc_y_plus - range_2g / 2;
        sc->ds4_calib_data[4].sens_numer = 2*DS4_ACC_RES_PER_G;
        sc->ds4_calib_data[4].sens_denom = range_2g;

        range_2g = acc_z_plus - acc_z_minus;
        sc->ds4_calib_data[5].abs_code = ABS_Z;
        sc->ds4_calib_data[5].bias = acc_z_plus - range_2g / 2;
        sc->ds4_calib_data[5].sens_numer = 2*DS4_ACC_RES_PER_G;
        sc->ds4_calib_data[5].sens_denom = range_2g;

err_stop:
        kfree(buf);
        return ret;
}

static void dualshock4_calibration_work(struct work_struct *work)
{
        struct sony_sc *sc = container_of(work, struct sony_sc, hotplug_worker);
        unsigned long flags;
        enum ds4_dongle_state dongle_state;
        int ret;

        ret = dualshock4_get_calibration_data(sc);
        if (ret < 0) {
                /* This call is very unlikely to fail for the dongle. When it
                 * fails we are probably in a very bad state, so mark the
                 * dongle as disabled. We will re-enable the dongle if a new
                 * DS4 hotplug is detect from sony_raw_event as any issues
                 * are likely resolved then (the dongle is quite stupid).
                 */
                hid_err(sc->hdev, "DualShock 4 USB dongle: calibration failed, disabling device\n");
                dongle_state = DONGLE_DISABLED;
        } else {
                hid_info(sc->hdev, "DualShock 4 USB dongle: calibration completed\n");
                dongle_state = DONGLE_CONNECTED;
        }

        spin_lock_irqsave(&sc->lock, flags);
        sc->ds4_dongle_state = dongle_state;
        spin_unlock_irqrestore(&sc->lock, flags);
}

static int dualshock4_get_version_info(struct sony_sc *sc)
{
        u8 *buf;
        int ret;

        buf = kmalloc(DS4_FEATURE_REPORT_0xA3_SIZE, GFP_KERNEL);
        if (!buf)
                return -ENOMEM;

        ret = hid_hw_raw_request(sc->hdev, 0xA3, buf,
                                 DS4_FEATURE_REPORT_0xA3_SIZE,
                                 HID_FEATURE_REPORT,
                                 HID_REQ_GET_REPORT);
        if (ret < 0) {
                kfree(buf);
                return ret;
        }

        sc->hw_version = get_unaligned_le16(&buf[35]);
        sc->fw_version = get_unaligned_le16(&buf[41]);

        kfree(buf);
        return 0;
}

static void sixaxis_set_leds_from_id(struct sony_sc *sc)
{
        static const u8 sixaxis_leds[10][4] = {
                                { 0x01, 0x00, 0x00, 0x00 },
                                { 0x00, 0x01, 0x00, 0x00 },
                                { 0x00, 0x00, 0x01, 0x00 },
                                { 0x00, 0x00, 0x00, 0x01 },
                                { 0x01, 0x00, 0x00, 0x01 },
                                { 0x00, 0x01, 0x00, 0x01 },
                                { 0x00, 0x00, 0x01, 0x01 },
                                { 0x01, 0x00, 0x01, 0x01 },
                                { 0x00, 0x01, 0x01, 0x01 },
                                { 0x01, 0x01, 0x01, 0x01 }
        };

        int id = sc->device_id;

        BUILD_BUG_ON(MAX_LEDS < ARRAY_SIZE(sixaxis_leds[0]));

        if (id < 0)
                return;

        id %= 10;
        memcpy(sc->led_state, sixaxis_leds[id], sizeof(sixaxis_leds[id]));
}

static void dualshock4_set_leds_from_id(struct sony_sc *sc)
{
        /* The first 4 color/index entries match what the PS4 assigns */
        static const u8 color_code[7][3] = {
                        /* Blue   */    { 0x00, 0x00, 0x40 },
                        /* Red    */    { 0x40, 0x00, 0x00 },
                        /* Green  */    { 0x00, 0x40, 0x00 },
                        /* Pink   */    { 0x20, 0x00, 0x20 },
                        /* Orange */    { 0x02, 0x01, 0x00 },
                        /* Teal   */    { 0x00, 0x01, 0x01 },
                        /* White  */    { 0x01, 0x01, 0x01 }
        };

        int id = sc->device_id;

        BUILD_BUG_ON(MAX_LEDS < ARRAY_SIZE(color_code[0]));

        if (id < 0)
                return;

        id %= 7;
        memcpy(sc->led_state, color_code[id], sizeof(color_code[id]));
}

static void buzz_set_leds(struct sony_sc *sc)
{
        struct hid_device *hdev = sc->hdev;
        struct list_head *report_list =
                &hdev->report_enum[HID_OUTPUT_REPORT].report_list;
        struct hid_report *report = list_entry(report_list->next,
                struct hid_report, list);
        s32 *value = report->field[0]->value;

        BUILD_BUG_ON(MAX_LEDS < 4);

        value[0] = 0x00;
        value[1] = sc->led_state[0] ? 0xff : 0x00;
        value[2] = sc->led_state[1] ? 0xff : 0x00;
        value[3] = sc->led_state[2] ? 0xff : 0x00;
        value[4] = sc->led_state[3] ? 0xff : 0x00;
        value[5] = 0x00;
        value[6] = 0x00;
        hid_hw_request(hdev, report, HID_REQ_SET_REPORT);
}

static void sony_set_leds(struct sony_sc *sc)
{
        if (!(sc->quirks & BUZZ_CONTROLLER))
                sony_schedule_work(sc, SONY_WORKER_STATE);
        else
                buzz_set_leds(sc);
}

static void sony_led_set_brightness(struct led_classdev *led,
                                    enum led_brightness value)
{
        struct device *dev = led->dev->parent;
        struct hid_device *hdev = to_hid_device(dev);
        struct sony_sc *drv_data;

        int n;
        int force_update;

        drv_data = hid_get_drvdata(hdev);
        if (!drv_data) {
                hid_err(hdev, "No device data\n");
                return;
        }

        /*
         * The Sixaxis on USB will override any LED settings sent to it
         * and keep flashing all of the LEDs until the PS button is pressed.
         * Updates, even if redundant, must be always be sent to the
         * controller to avoid having to toggle the state of an LED just to
         * stop the flashing later on.
         */
        force_update = !!(drv_data->quirks & SIXAXIS_CONTROLLER_USB);

        for (n = 0; n < drv_data->led_count; n++) {
                if (led == drv_data->leds[n] && (force_update ||
                        (value != drv_data->led_state[n] ||
                        drv_data->led_delay_on[n] ||
                        drv_data->led_delay_off[n]))) {

                        drv_data->led_state[n] = value;

                        /* Setting the brightness stops the blinking */
                        drv_data->led_delay_on[n] = 0;
                        drv_data->led_delay_off[n] = 0;

                        sony_set_leds(drv_data);
                        break;
                }
        }
}

static enum led_brightness sony_led_get_brightness(struct led_classdev *led)
{
        struct device *dev = led->dev->parent;
        struct hid_device *hdev = to_hid_device(dev);
        struct sony_sc *drv_data;

        int n;

        drv_data = hid_get_drvdata(hdev);
        if (!drv_data) {
                hid_err(hdev, "No device data\n");
                return LED_OFF;
        }

        for (n = 0; n < drv_data->led_count; n++) {
                if (led == drv_data->leds[n])
                        return drv_data->led_state[n];
        }

        return LED_OFF;
}

static int sony_led_blink_set(struct led_classdev *led, unsigned long *delay_on,
                                unsigned long *delay_off)
{
        struct device *dev = led->dev->parent;
        struct hid_device *hdev = to_hid_device(dev);
        struct sony_sc *drv_data = hid_get_drvdata(hdev);
        int n;
        u8 new_on, new_off;

        if (!drv_data) {
                hid_err(hdev, "No device data\n");
                return -EINVAL;
        }

        /* Max delay is 255 deciseconds or 2550 milliseconds */
        if (*delay_on > 2550)
                *delay_on = 2550;
        if (*delay_off > 2550)
                *delay_off = 2550;

        /* Blink at 1 Hz if both values are zero */
        if (!*delay_on && !*delay_off)
                *delay_on = *delay_off = 500;

        new_on = *delay_on / 10;
        new_off = *delay_off / 10;

        for (n = 0; n < drv_data->led_count; n++) {
                if (led == drv_data->leds[n])
                        break;
        }

        /* This LED is not registered on this device */
        if (n >= drv_data->led_count)
                return -EINVAL;

        /* Don't schedule work if the values didn't change */
        if (new_on != drv_data->led_delay_on[n] ||
                new_off != drv_data->led_delay_off[n]) {
                drv_data->led_delay_on[n] = new_on;
                drv_data->led_delay_off[n] = new_off;
                sony_schedule_work(drv_data, SONY_WORKER_STATE);
        }

        return 0;
}

static void sony_leds_remove(struct sony_sc *sc)
{
        struct led_classdev *led;
        int n;

        BUG_ON(!(sc->quirks & SONY_LED_SUPPORT));

        for (n = 0; n < sc->led_count; n++) {
                led = sc->leds[n];
                sc->leds[n] = NULL;
                if (!led)

                        continue;
                led_classdev_unregister(led);
                kfree(led);
        }

        sc->led_count = 0;
}

static int sony_leds_init(struct sony_sc *sc)
{
        struct hid_device *hdev = sc->hdev;
        int n, ret = 0;
        int use_ds4_names;
        struct led_classdev *led;
        size_t name_sz;
        char *name;
        size_t name_len;
        const char *name_fmt;
        static const char * const ds4_name_str[] = { "red", "green", "blue",
                                                  "global" };
        u8 max_brightness[MAX_LEDS] = { [0 ... (MAX_LEDS - 1)] = 1 };
        u8 use_hw_blink[MAX_LEDS] = { 0 };

        BUG_ON(!(sc->quirks & SONY_LED_SUPPORT));

        if (sc->quirks & BUZZ_CONTROLLER) {
                sc->led_count = 4;
                use_ds4_names = 0;
                name_len = strlen("::buzz#");
                name_fmt = "%s::buzz%d";
                /* Validate expected report characteristics. */
                if (!hid_validate_values(hdev, HID_OUTPUT_REPORT, 0, 0, 7))
                        return -ENODEV;
        } else if (sc->quirks & DUALSHOCK4_CONTROLLER) {
                dualshock4_set_leds_from_id(sc);
                sc->led_state[3] = 1;
                sc->led_count = 4;
                memset(max_brightness, 255, 3);
                use_hw_blink[3] = 1;
                use_ds4_names = 1;
                name_len = 0;
                name_fmt = "%s:%s";
        } else if (sc->quirks & MOTION_CONTROLLER) {
                sc->led_count = 3;
                memset(max_brightness, 255, 3);
                use_ds4_names = 1;
                name_len = 0;
                name_fmt = "%s:%s";
        } else if (sc->quirks & NAVIGATION_CONTROLLER) {
                static const u8 navigation_leds[4] = {0x01, 0x00, 0x00, 0x00};

                memcpy(sc->led_state, navigation_leds, sizeof(navigation_leds));
                sc->led_count = 1;
                memset(use_hw_blink, 1, 4);
                use_ds4_names = 0;
                name_len = strlen("::sony#");
                name_fmt = "%s::sony%d";
        } else {
                sixaxis_set_leds_from_id(sc);
                sc->led_count = 4;
                memset(use_hw_blink, 1, 4);
                use_ds4_names = 0;
                name_len = strlen("::sony#");
                name_fmt = "%s::sony%d";
        }

        /*
         * Clear LEDs as we have no way of reading their initial state. This is
         * only relevant if the driver is loaded after somebody actively set the
         * LEDs to on
         */
        sony_set_leds(sc);

        name_sz = strlen(dev_name(&hdev->dev)) + name_len + 1;

        for (n = 0; n < sc->led_count; n++) {

                if (use_ds4_names)
                        name_sz = strlen(dev_name(&hdev->dev)) + strlen(ds4_name_str[n]) + 2;

                led = kzalloc(sizeof(struct led_classdev) + name_sz, GFP_KERNEL);
                if (!led) {
                        hid_err(hdev, "Couldn't allocate memory for LED %d\n", n);
                        ret = -ENOMEM;
                        goto error_leds;
                }

                name = (void *)(&led[1]);
                if (use_ds4_names)
                        snprintf(name, name_sz, name_fmt, dev_name(&hdev->dev),
                        ds4_name_str[n]);
                else
                        snprintf(name, name_sz, name_fmt, dev_name(&hdev->dev), n + 1);
                led->name = name;
                led->brightness = sc->led_state[n];
                led->max_brightness = max_brightness[n];
                led->flags = LED_CORE_SUSPENDRESUME;
                led->brightness_get = sony_led_get_brightness;
                led->brightness_set = sony_led_set_brightness;

                if (use_hw_blink[n])
                        led->blink_set = sony_led_blink_set;

                sc->leds[n] = led;

                ret = led_classdev_register(&hdev->dev, led);
                if (ret) {
                        hid_err(hdev, "Failed to register LED %d\n", n);
                        sc->leds[n] = NULL;
                        kfree(led);
                        goto error_leds;
                }
        }

        return ret;

error_leds:
        sony_leds_remove(sc);

        return ret;
}

static void sixaxis_send_output_report(struct sony_sc *sc)
{
        static const union sixaxis_output_report_01 default_report = {
                .buf = {
                        0x01,
                        0x01, 0xff, 0x00, 0xff, 0x00,
                        0x00, 0x00, 0x00, 0x00, 0x00,
                        0xff, 0x27, 0x10, 0x00, 0x32,
                        0xff, 0x27, 0x10, 0x00, 0x32,
                        0xff, 0x27, 0x10, 0x00, 0x32,
                        0xff, 0x27, 0x10, 0x00, 0x32,
                        0x00, 0x00, 0x00, 0x00, 0x00
                }
        };
        struct sixaxis_output_report *report =
                (struct sixaxis_output_report *)sc->output_report_dmabuf;
        int n;

        /* Initialize the report with default values */
        memcpy(report, &default_report, sizeof(struct sixaxis_output_report));

#ifdef CONFIG_SONY_FF
        report->rumble.right_motor_on = sc->right ? 1 : 0;
        report->rumble.left_motor_force = sc->left;
#endif

        report->leds_bitmap |= sc->led_state[0] << 1;
        report->leds_bitmap |= sc->led_state[1] << 2;
        report->leds_bitmap |= sc->led_state[2] << 3;
        report->leds_bitmap |= sc->led_state[3] << 4;

        /* Set flag for all leds off, required for 3rd party INTEC controller */
        if ((report->leds_bitmap & 0x1E) == 0)
                report->leds_bitmap |= 0x20;

        /*
         * The LEDs in the report are indexed in reverse order to their
         * corresponding light on the controller.
         * Index 0 = LED 4, index 1 = LED 3, etc...
         *
         * In the case of both delay values being zero (blinking disabled) the
         * default report values should be used or the controller LED will be
         * always off.
         */
        for (n = 0; n < 4; n++) {
                if (sc->led_delay_on[n] || sc->led_delay_off[n]) {
                        report->led[3 - n].duty_off = sc->led_delay_off[n];
                        report->led[3 - n].duty_on = sc->led_delay_on[n];
                }
        }

        hid_hw_raw_request(sc->hdev, report->report_id, (u8 *)report,
                        sizeof(struct sixaxis_output_report),
                        HID_OUTPUT_REPORT, HID_REQ_SET_REPORT);
}

static void dualshock4_send_output_report(struct sony_sc *sc)
{
        struct hid_device *hdev = sc->hdev;
        u8 *buf = sc->output_report_dmabuf;
        int offset;

        /*
         * NOTE: The lower 6 bits of buf[1] field of the Bluetooth report
         * control the interval at which Dualshock 4 reports data:
         * 0x00 - 1ms
         * 0x01 - 1ms
         * 0x02 - 2ms
         * 0x3E - 62ms
         * 0x3F - disabled
         */
        if (sc->quirks & (DUALSHOCK4_CONTROLLER_USB | DUALSHOCK4_DONGLE)) {
                memset(buf, 0, DS4_OUTPUT_REPORT_0x05_SIZE);
                buf[0] = 0x05;
                buf[1] = 0x07; /* blink + LEDs + motor */
                offset = 4;
        } else {
                memset(buf, 0, DS4_OUTPUT_REPORT_0x11_SIZE);
                buf[0] = 0x11;
                buf[1] = 0xC0 /* HID + CRC */ | sc->ds4_bt_poll_interval;
                buf[3] = 0x07; /* blink + LEDs + motor */
                offset = 6;
        }

#ifdef CONFIG_SONY_FF
        buf[offset++] = sc->right;
        buf[offset++] = sc->left;
#else
        offset += 2;
#endif

        /* LED 3 is the global control */
        if (sc->led_state[3]) {
                buf[offset++] = sc->led_state[0];
                buf[offset++] = sc->led_state[1];
                buf[offset++] = sc->led_state[2];
        } else {
                offset += 3;
        }

        /* If both delay values are zero the DualShock 4 disables blinking. */
        buf[offset++] = sc->led_delay_on[3];
        buf[offset++] = sc->led_delay_off[3];

        if (sc->quirks & (DUALSHOCK4_CONTROLLER_USB | DUALSHOCK4_DONGLE))
                hid_hw_output_report(hdev, buf, DS4_OUTPUT_REPORT_0x05_SIZE);
        else {
                /* CRC generation */
                u8 bthdr = 0xA2;
                u32 crc;

                crc = crc32_le(0xFFFFFFFF, &bthdr, 1);
                crc = ~crc32_le(crc, buf, DS4_OUTPUT_REPORT_0x11_SIZE-4);
                put_unaligned_le32(crc, &buf[74]);
                hid_hw_output_report(hdev, buf, DS4_OUTPUT_REPORT_0x11_SIZE);
        }
}

static void motion_send_output_report(struct sony_sc *sc)
{
        struct hid_device *hdev = sc->hdev;
        struct motion_output_report_02 *report =
                (struct motion_output_report_02 *)sc->output_report_dmabuf;

        memset(report, 0, MOTION_REPORT_0x02_SIZE);

        report->type = 0x02; /* set leds */
        report->r = sc->led_state[0];
        report->g = sc->led_state[1];
        report->b = sc->led_state[2];

#ifdef CONFIG_SONY_FF
        report->rumble = max(sc->right, sc->left);
#endif

        hid_hw_output_report(hdev, (u8 *)report, MOTION_REPORT_0x02_SIZE);
}

static inline void sony_send_output_report(struct sony_sc *sc)
{
        if (sc->send_output_report)
                sc->send_output_report(sc);
}

static void sony_state_worker(struct work_struct *work)
{
        struct sony_sc *sc = container_of(work, struct sony_sc, state_worker);

        sc->send_output_report(sc);
}

static int sony_allocate_output_report(struct sony_sc *sc)
{
        if ((sc->quirks & SIXAXIS_CONTROLLER) ||
                        (sc->quirks & NAVIGATION_CONTROLLER))
                sc->output_report_dmabuf =
                        kmalloc(sizeof(union sixaxis_output_report_01),
                                GFP_KERNEL);
        else if (sc->quirks & DUALSHOCK4_CONTROLLER_BT)
                sc->output_report_dmabuf = kmalloc(DS4_OUTPUT_REPORT_0x11_SIZE,
                                                GFP_KERNEL);
        else if (sc->quirks & (DUALSHOCK4_CONTROLLER_USB | DUALSHOCK4_DONGLE))
                sc->output_report_dmabuf = kmalloc(DS4_OUTPUT_REPORT_0x05_SIZE,
                                                GFP_KERNEL);
        else if (sc->quirks & MOTION_CONTROLLER)
                sc->output_report_dmabuf = kmalloc(MOTION_REPORT_0x02_SIZE,
                                                GFP_KERNEL);
        else
                return 0;

        if (!sc->output_report_dmabuf)
                return -ENOMEM;

        return 0;
}

#ifdef CONFIG_SONY_FF
static int sony_play_effect(struct input_dev *dev, void *data,
                            struct ff_effect *effect)
{
        struct hid_device *hid = input_get_drvdata(dev);
        struct sony_sc *sc = hid_get_drvdata(hid);

        if (effect->type != FF_RUMBLE)
                return 0;

        sc->left = effect->u.rumble.strong_magnitude / 256;
        sc->right = effect->u.rumble.weak_magnitude / 256;

        sony_schedule_work(sc, SONY_WORKER_STATE);
        return 0;
}

static int sony_init_ff(struct sony_sc *sc)
{
        struct hid_input *hidinput = list_entry(sc->hdev->inputs.next,
                                                struct hid_input, list);
        struct input_dev *input_dev = hidinput->input;

        input_set_capability(input_dev, EV_FF, FF_RUMBLE);
        return input_ff_create_memless(input_dev, NULL, sony_play_effect);
}

#else
static int sony_init_ff(struct sony_sc *sc)
{
        return 0;
}

#endif

static int sony_battery_get_property(struct power_supply *psy,
                                     enum power_supply_property psp,
                                     union power_supply_propval *val)
{
        struct sony_sc *sc = power_supply_get_drvdata(psy);
        unsigned long flags;
        int ret = 0;
        u8 battery_charging, battery_capacity, cable_state;

        spin_lock_irqsave(&sc->lock, flags);
        battery_charging = sc->battery_charging;
        battery_capacity = sc->battery_capacity;
        cable_state = sc->cable_state;
        spin_unlock_irqrestore(&sc->lock, flags);

        switch (psp) {
        case POWER_SUPPLY_PROP_PRESENT:
                val->intval = 1;
                break;
        case POWER_SUPPLY_PROP_SCOPE:
                val->intval = POWER_SUPPLY_SCOPE_DEVICE;
                break;
        case POWER_SUPPLY_PROP_CAPACITY:
                val->intval = battery_capacity;
                break;
        case POWER_SUPPLY_PROP_STATUS:
                if (battery_charging)
                        val->intval = POWER_SUPPLY_STATUS_CHARGING;
                else
                        if (battery_capacity == 100 && cable_state)
                                val->intval = POWER_SUPPLY_STATUS_FULL;
                        else
                                val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
                break;
        default:
                ret = -EINVAL;
                break;
        }
        return ret;
}

static int sony_battery_probe(struct sony_sc *sc, int append_dev_id)
{
        const char *battery_str_fmt = append_dev_id ?
                "sony_controller_battery_%pMR_%i" :
                "sony_controller_battery_%pMR";
        struct power_supply_config psy_cfg = { .drv_data = sc, };
        struct hid_device *hdev = sc->hdev;
        int ret;

        /*
         * Set the default battery level to 100% to avoid low battery warnings
         * if the battery is polled before the first device report is received.
         */
        sc->battery_capacity = 100;

        sc->battery_desc.properties = sony_battery_props;
        sc->battery_desc.num_properties = ARRAY_SIZE(sony_battery_props);
        sc->battery_desc.get_property = sony_battery_get_property;
        sc->battery_desc.type = POWER_SUPPLY_TYPE_BATTERY;
        sc->battery_desc.use_for_apm = 0;
        sc->battery_desc.name = kasprintf(GFP_KERNEL, battery_str_fmt,
                                          sc->mac_address, sc->device_id);
        if (!sc->battery_desc.name)
                return -ENOMEM;

        sc->battery = power_supply_register(&hdev->dev, &sc->battery_desc,
                                            &psy_cfg);
        if (IS_ERR(sc->battery)) {
                ret = PTR_ERR(sc->battery);
                hid_err(hdev, "Unable to register battery device\n");
                goto err_free;
        }

        power_supply_powers(sc->battery, &hdev->dev);
        return 0;

err_free:
        kfree(sc->battery_desc.name);
        sc->battery_desc.name = NULL;
        return ret;
}

static void sony_battery_remove(struct sony_sc *sc)
{
        if (!sc->battery_desc.name)
                return;

        power_supply_unregister(sc->battery);
        kfree(sc->battery_desc.name);
        sc->battery_desc.name = NULL;
}

/*
 * If a controller is plugged in via USB while already connected via Bluetooth
 * it will show up as two devices. A global list of connected controllers and
 * their MAC addresses is maintained to ensure that a device is only connected
 * once.
 *
 * Some USB-only devices masquerade as Sixaxis controllers and all have the
 * same dummy Bluetooth address, so a comparison of the connection type is
 * required.  Devices are only rejected in the case where two devices have
 * matching Bluetooth addresses on different bus types.
 */
static inline int sony_compare_connection_type(struct sony_sc *sc0,
                                                struct sony_sc *sc1)
{
        const int sc0_not_bt = !(sc0->quirks & SONY_BT_DEVICE);
        const int sc1_not_bt = !(sc1->quirks & SONY_BT_DEVICE);

        return sc0_not_bt == sc1_not_bt;
}

static int sony_check_add_dev_list(struct sony_sc *sc)
{
        struct sony_sc *entry;
        unsigned long flags;
        int ret;

        spin_lock_irqsave(&sony_dev_list_lock, flags);

        list_for_each_entry(entry, &sony_device_list, list_node) {
                ret = memcmp(sc->mac_address, entry->mac_address,
                                sizeof(sc->mac_address));
                if (!ret) {
                        if (sony_compare_connection_type(sc, entry)) {
                                ret = 1;
                        } else {
                                ret = -EEXIST;
                                hid_info(sc->hdev,
                                "controller with MAC address %pMR already connected\n",
                                sc->mac_address);
                        }
                        goto unlock;
                }
        }

        ret = 0;
        list_add(&(sc->list_node), &sony_device_list);

unlock:
        spin_unlock_irqrestore(&sony_dev_list_lock, flags);
        return ret;
}

static void sony_remove_dev_list(struct sony_sc *sc)
{
        unsigned long flags;

        if (sc->list_node.next) {
                spin_lock_irqsave(&sony_dev_list_lock, flags);
                list_del(&(sc->list_node));
                spin_unlock_irqrestore(&sony_dev_list_lock, flags);
        }
}

static int sony_get_bt_devaddr(struct sony_sc *sc)
{
        int ret;

        /* HIDP stores the device MAC address as a string in the uniq field. */
        ret = strlen(sc->hdev->uniq);
        if (ret != 17)
                return -EINVAL;

        ret = sscanf(sc->hdev->uniq,
                "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
                &sc->mac_address[5], &sc->mac_address[4], &sc->mac_address[3],
                &sc->mac_address[2], &sc->mac_address[1], &sc->mac_address[0]);

        if (ret != 6)
                return -EINVAL;

        return 0;
}

static int sony_check_add(struct sony_sc *sc)
{
        u8 *buf = NULL;
        int n, ret;

        if ((sc->quirks & DUALSHOCK4_CONTROLLER_BT) ||
            (sc->quirks & MOTION_CONTROLLER_BT) ||
            (sc->quirks & NAVIGATION_CONTROLLER_BT) ||
            (sc->quirks & SIXAXIS_CONTROLLER_BT)) {
                /*
                 * sony_get_bt_devaddr() attempts to parse the Bluetooth MAC
                 * address from the uniq string where HIDP stores it.
                 * As uniq cannot be guaranteed to be a MAC address in all cases
                 * a failure of this function should not prevent the connection.
                 */
                if (sony_get_bt_devaddr(sc) < 0) {
                        hid_warn(sc->hdev, "UNIQ does not contain a MAC address; duplicate check skipped\n");
                        return 0;
                }
        } else if (sc->quirks & (DUALSHOCK4_CONTROLLER_USB | DUALSHOCK4_DONGLE)) {
                buf = kmalloc(DS4_FEATURE_REPORT_0x81_SIZE, GFP_KERNEL);
                if (!buf)
                        return -ENOMEM;

                /*
                 * The MAC address of a DS4 controller connected via USB can be
                 * retrieved with feature report 0x81. The address begins at
                 * offset 1.
                 */
                ret = hid_hw_raw_request(sc->hdev, 0x81, buf,
                                DS4_FEATURE_REPORT_0x81_SIZE, HID_FEATURE_REPORT,
                                HID_REQ_GET_REPORT);

                if (ret != DS4_FEATURE_REPORT_0x81_SIZE) {
                        hid_err(sc->hdev, "failed to retrieve feature report 0x81 with the DualShock 4 MAC address\n");
                        ret = ret < 0 ? ret : -EINVAL;
                        goto out_free;
                }

                memcpy(sc->mac_address, &buf[1], sizeof(sc->mac_address));

                snprintf(sc->hdev->uniq, sizeof(sc->hdev->uniq),
                         "%pMR", sc->mac_address);
        } else if ((sc->quirks & SIXAXIS_CONTROLLER_USB) ||
                        (sc->quirks & NAVIGATION_CONTROLLER_USB)) {
                buf = kmalloc(SIXAXIS_REPORT_0xF2_SIZE, GFP_KERNEL);
                if (!buf)
                        return -ENOMEM;

                /*
                 * The MAC address of a Sixaxis controller connected via USB can
                 * be retrieved with feature report 0xf2. The address begins at
                 * offset 4.
                 */
                ret = hid_hw_raw_request(sc->hdev, 0xf2, buf,
                                SIXAXIS_REPORT_0xF2_SIZE, HID_FEATURE_REPORT,
                                HID_REQ_GET_REPORT);

                if (ret != SIXAXIS_REPORT_0xF2_SIZE) {
                        hid_err(sc->hdev, "failed to retrieve feature report 0xf2 with the Sixaxis MAC address\n");
                        ret = ret < 0 ? ret : -EINVAL;
                        goto out_free;
                }

                /*
                 * The Sixaxis device MAC in the report is big-endian and must
                 * be byte-swapped.
                 */
                for (n = 0; n < 6; n++)
                        sc->mac_address[5-n] = buf[4+n];

                snprintf(sc->hdev->uniq, sizeof(sc->hdev->uniq),
                         "%pMR", sc->mac_address);
        } else {
                return 0;
        }

        ret = sony_check_add_dev_list(sc);

out_free:

        kfree(buf);

        return ret;
}

static int sony_set_device_id(struct sony_sc *sc)
{
        int ret;

        /*
         * Only DualShock 4 or Sixaxis controllers get an id.
         * All others are set to -1.
         */
        if ((sc->quirks & SIXAXIS_CONTROLLER) ||
            (sc->quirks & DUALSHOCK4_CONTROLLER)) {
                ret = ida_simple_get(&sony_device_id_allocator, 0, 0,
                                        GFP_KERNEL);
                if (ret < 0) {
                        sc->device_id = -1;
                        return ret;
                }
                sc->device_id = ret;
        } else {
                sc->device_id = -1;
        }

        return 0;
}

static void sony_release_device_id(struct sony_sc *sc)
{
        if (sc->device_id >= 0) {
                ida_simple_remove(&sony_device_id_allocator, sc->device_id);
                sc->device_id = -1;
        }
}

static inline void sony_init_output_report(struct sony_sc *sc,
                                void (*send_output_report)(struct sony_sc *))
{
        sc->send_output_report = send_output_report;

        if (!sc->state_worker_initialized)
                INIT_WORK(&sc->state_worker, sony_state_worker);

        sc->state_worker_initialized = 1;
}

static inline void sony_cancel_work_sync(struct sony_sc *sc)
{
        if (sc->hotplug_worker_initialized)
                cancel_work_sync(&sc->hotplug_worker);
        if (sc->state_worker_initialized)
                cancel_work_sync(&sc->state_worker);
}


static int sony_input_configured(struct hid_device *hdev,
                                        struct hid_input *hidinput)
{
        struct sony_sc *sc = hid_get_drvdata(hdev);
        int append_dev_id;
        int ret;

        ret = sony_set_device_id(sc);
        if (ret < 0) {
                hid_err(hdev, "failed to allocate the device id\n");
                goto err_stop;
        }

        ret = append_dev_id = sony_check_add(sc);
        if (ret < 0)
                goto err_stop;

        ret = sony_allocate_output_report(sc);
        if (ret < 0) {
                hid_err(hdev, "failed to allocate the output report buffer\n");
                goto err_stop;
        }

        if (sc->quirks & NAVIGATION_CONTROLLER_USB) {
                /*
                 * The Sony Sixaxis does not handle HID Output Reports on the
                 * Interrupt EP like it could, so we need to force HID Output
                 * Reports to use HID_REQ_SET_REPORT on the Control EP.
                 *
                 * There is also another issue about HID Output Reports via USB,
                 * the Sixaxis does not want the report_id as part of the data
                 * packet, so we have to discard buf[0] when sending the actual
                 * control message, even for numbered reports, humpf!
                 *
                 * Additionally, the Sixaxis on USB isn't properly initialized
                 * until the PS logo button is pressed and as such won't retain
                 * any state set by an output report, so the initial
                 * configuration report is deferred until the first input
                 * report arrives.
                 */
                hdev->quirks |= HID_QUIRK_NO_OUTPUT_REPORTS_ON_INTR_EP;
                hdev->quirks |= HID_QUIRK_SKIP_OUTPUT_REPORT_ID;
                sc->defer_initialization = 1;

                ret = sixaxis_set_operational_usb(hdev);
                if (ret < 0) {
                        hid_err(hdev, "Failed to set controller into operational mode\n");
                        goto err_stop;
                }

                sony_init_output_report(sc, sixaxis_send_output_report);
        } else if (sc->quirks & NAVIGATION_CONTROLLER_BT) {
                /*
                 * The Navigation controller wants output reports sent on the ctrl
                 * endpoint when connected via Bluetooth.
                 */
                hdev->quirks |= HID_QUIRK_NO_OUTPUT_REPORTS_ON_INTR_EP;

                ret = sixaxis_set_operational_bt(hdev);
                if (ret < 0) {
                        hid_err(hdev, "Failed to set controller into operational mode\n");
                        goto err_stop;
                }

                sony_init_output_report(sc, sixaxis_send_output_report);
        } else if (sc->quirks & SIXAXIS_CONTROLLER_USB) {
                /*
                 * The Sony Sixaxis does not handle HID Output Reports on the
                 * Interrupt EP and the device only becomes active when the
                 * PS button is pressed. See comment for Navigation controller
                 * above for more details.
                 */
                hdev->quirks |= HID_QUIRK_NO_OUTPUT_REPORTS_ON_INTR_EP;
                hdev->quirks |= HID_QUIRK_SKIP_OUTPUT_REPORT_ID;
                sc->defer_initialization = 1;

                ret = sixaxis_set_operational_usb(hdev);
                if (ret < 0) {
                        hid_err(hdev, "Failed to set controller into operational mode\n");
                        goto err_stop;
                }

                ret = sony_register_sensors(sc);
                if (ret) {
                        hid_err(sc->hdev,
                        "Unable to initialize motion sensors: %d\n", ret);
                        goto err_stop;
                }

                sony_init_output_report(sc, sixaxis_send_output_report);
        } else if (sc->quirks & SIXAXIS_CONTROLLER_BT) {
                /*
                 * The Sixaxis wants output reports sent on the ctrl endpoint
                 * when connected via Bluetooth.
                 */
                hdev->quirks |= HID_QUIRK_NO_OUTPUT_REPORTS_ON_INTR_EP;

                ret = sixaxis_set_operational_bt(hdev);
                if (ret < 0) {
                        hid_err(hdev, "Failed to set controller into operational mode\n");
                        goto err_stop;
                }

                ret = sony_register_sensors(sc);
                if (ret) {
                        hid_err(sc->hdev,
                        "Unable to initialize motion sensors: %d\n", ret);
                        goto err_stop;
                }

                sony_init_output_report(sc, sixaxis_send_output_report);
        } else if (sc->quirks & DUALSHOCK4_CONTROLLER) {
                ret = dualshock4_get_calibration_data(sc);
                if (ret < 0) {
                        hid_err(hdev, "Failed to get calibration data from Dualshock 4\n");
                        goto err_stop;
                }

                ret = dualshock4_get_version_info(sc);
                if (ret < 0) {
                        hid_err(sc->hdev, "Failed to get version data from Dualshock 4\n");
                        goto err_stop;
                }

                ret = device_create_file(&sc->hdev->dev, &dev_attr_firmware_version);
                if (ret) {
                        /* Make zero for cleanup reasons of sysfs entries. */
                        sc->fw_version = 0;
                        sc->hw_version = 0;
                        hid_err(sc->hdev, "can't create sysfs firmware_version attribute err: %d\n", ret);
                        goto err_stop;
                }

                ret = device_create_file(&sc->hdev->dev, &dev_attr_hardware_version);
                if (ret) {
                        sc->hw_version = 0;
                        hid_err(sc->hdev, "can't create sysfs hardware_version attribute err: %d\n", ret);
                        goto err_stop;
                }

                /*
                 * The Dualshock 4 touchpad supports 2 touches and has a
                 * resolution of 1920x942 (44.86 dots/mm).
                 */
                ret = sony_register_touchpad(sc, 2, 1920, 942, 0, 0, 0);
                if (ret) {
                        hid_err(sc->hdev,
                        "Unable to initialize multi-touch slots: %d\n",
                        ret);
                        goto err_stop;
                }

                ret = sony_register_sensors(sc);
                if (ret) {
                        hid_err(sc->hdev,
                        "Unable to initialize motion sensors: %d\n", ret);
                        goto err_stop;
                }

                if (sc->quirks & DUALSHOCK4_CONTROLLER_BT) {
                        sc->ds4_bt_poll_interval = DS4_BT_DEFAULT_POLL_INTERVAL_MS;
                        ret = device_create_file(&sc->hdev->dev, &dev_attr_bt_poll_interval);
                        if (ret)
                                hid_warn(sc->hdev,
                                 "can't create sysfs bt_poll_interval attribute err: %d\n",
                                 ret);
                }

                if (sc->quirks & DUALSHOCK4_DONGLE) {
                        INIT_WORK(&sc->hotplug_worker, dualshock4_calibration_work);
                        sc->hotplug_worker_initialized = 1;
                        sc->ds4_dongle_state = DONGLE_DISCONNECTED;
                }

                sony_init_output_report(sc, dualshock4_send_output_report);
        } else if (sc->quirks & NSG_MRXU_REMOTE) {
                /*
                 * The NSG-MRxU touchpad supports 2 touches and has a
                 * resolution of 1667x1868
                 */
                ret = sony_register_touchpad(sc, 2,
                        NSG_MRXU_MAX_X, NSG_MRXU_MAX_Y, 15, 15, 1);
                if (ret) {
                        hid_err(sc->hdev,
                        "Unable to initialize multi-touch slots: %d\n",
                        ret);
                        goto err_stop;
                }

        } else if (sc->quirks & MOTION_CONTROLLER) {
                sony_init_output_report(sc, motion_send_output_report);
        } else {
                ret = 0;
        }

        if (sc->quirks & SONY_LED_SUPPORT) {
                ret = sony_leds_init(sc);
                if (ret < 0)
                        goto err_stop;
        }

        if (sc->quirks & SONY_BATTERY_SUPPORT) {
                ret = sony_battery_probe(sc, append_dev_id);
                if (ret < 0)
                        goto err_stop;

                /* Open the device to receive reports with battery info */
                ret = hid_hw_open(hdev);
                if (ret < 0) {
                        hid_err(hdev, "hw open failed\n");
                        goto err_stop;
                }
        }

        if (sc->quirks & SONY_FF_SUPPORT) {
                ret = sony_init_ff(sc);
                if (ret < 0)
                        goto err_close;
        }

        return 0;
err_close:
        hid_hw_close(hdev);
err_stop:
        /* Piggy back on the default ds4_bt_ poll_interval to determine
         * if we need to remove the file as we don't know for sure if we
         * executed that logic.
         */
        if (sc->ds4_bt_poll_interval)
                device_remove_file(&sc->hdev->dev, &dev_attr_bt_poll_interval);
        if (sc->fw_version)
                device_remove_file(&sc->hdev->dev, &dev_attr_firmware_version);
        if (sc->hw_version)
                device_remove_file(&sc->hdev->dev, &dev_attr_hardware_version);
        if (sc->quirks & SONY_LED_SUPPORT)
                sony_leds_remove(sc);
        if (sc->quirks & SONY_BATTERY_SUPPORT)
                sony_battery_remove(sc);
        if (sc->touchpad)
                sony_unregister_touchpad(sc);
        if (sc->sensor_dev)
                sony_unregister_sensors(sc);
        sony_cancel_work_sync(sc);
        kfree(sc->output_report_dmabuf);
        sony_remove_dev_list(sc);
        sony_release_device_id(sc);
        hid_hw_stop(hdev);
        return ret;
}

static int sony_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
        int ret;
        unsigned long quirks = id->driver_data;
        struct sony_sc *sc;
        unsigned int connect_mask = HID_CONNECT_DEFAULT;

        if (!strcmp(hdev->name, "FutureMax Dance Mat"))
                quirks |= FUTUREMAX_DANCE_MAT;

        sc = devm_kzalloc(&hdev->dev, sizeof(*sc), GFP_KERNEL);
        if (sc == NULL) {
                hid_err(hdev, "can't alloc sony descriptor\n");
                return -ENOMEM;
        }

        spin_lock_init(&sc->lock);

        sc->quirks = quirks;
        hid_set_drvdata(hdev, sc);
        sc->hdev = hdev;

        ret = hid_parse(hdev);
        if (ret) {
                hid_err(hdev, "parse failed\n");
                return ret;
        }

        if (sc->quirks & VAIO_RDESC_CONSTANT)
                connect_mask |= HID_CONNECT_HIDDEV_FORCE;
        else if (sc->quirks & SIXAXIS_CONTROLLER)
                connect_mask |= HID_CONNECT_HIDDEV_FORCE;

        /* Patch the hw version on DS3/4 compatible devices, so applications can
         * distinguish between the default HID mappings and the mappings defined
         * by the Linux game controller spec. This is important for the SDL2
         * library, which has a game controller database, which uses device ids
         * in combination with version as a key.
         */
        if (sc->quirks & (SIXAXIS_CONTROLLER | DUALSHOCK4_CONTROLLER))
                hdev->version |= 0x8000;

        ret = hid_hw_start(hdev, connect_mask);
        if (ret) {
                hid_err(hdev, "hw start failed\n");
                return ret;
        }

        /* sony_input_configured can fail, but this doesn't result
         * in hid_hw_start failures (intended). Check whether
         * the HID layer claimed the device else fail.
         * We don't know the actual reason for the failure, most
         * likely it is due to EEXIST in case of double connection
         * of USB and Bluetooth, but could have been due to ENOMEM
         * or other reasons as well.
         */
        if (!(hdev->claimed & HID_CLAIMED_INPUT)) {
                hid_err(hdev, "failed to claim input\n");
                return -ENODEV;
        }

        return ret;
}

static void sony_remove(struct hid_device *hdev)
{
        struct sony_sc *sc = hid_get_drvdata(hdev);

        hid_hw_close(hdev);

        if (sc->quirks & SONY_LED_SUPPORT)
                sony_leds_remove(sc);

        if (sc->quirks & SONY_BATTERY_SUPPORT)
                sony_battery_remove(sc);

        if (sc->touchpad)
                sony_unregister_touchpad(sc);

        if (sc->sensor_dev)
                sony_unregister_sensors(sc);

        if (sc->quirks & DUALSHOCK4_CONTROLLER_BT)
                device_remove_file(&sc->hdev->dev, &dev_attr_bt_poll_interval);

        if (sc->fw_version)
                device_remove_file(&sc->hdev->dev, &dev_attr_firmware_version);

        if (sc->hw_version)
                device_remove_file(&sc->hdev->dev, &dev_attr_hardware_version);

        sony_cancel_work_sync(sc);

        kfree(sc->output_report_dmabuf);

        sony_remove_dev_list(sc);

        sony_release_device_id(sc);

        hid_hw_stop(hdev);
}

#ifdef CONFIG_PM