#include "hid-tm.h"
#include "usbhid.h"
#include <linux/hrtimer.h>
#include <linux/ktime.h>
#include <linux/fixp-arith.h>

#define T300RS_MAX_EFFECTS 16
#define T300RS_BUFFER_LENGTH 64

/* the wheel seems to only be capable of processing a certain number of
 * interrupts per second, and if this value is too low the kernel urb buffer(or
 * some buffer at least) fills up. Optimally I would figure out some way to
 * space out the interrupts so that they all leave at regular intervals, but for
 * now this is good enough, go slow enough that everything works.
 * */
#define DEFAULT_TIMER_PERIOD 8

#define FF_EFFECT_QUEUE_UPLOAD 0
#define FF_EFFECT_QUEUE_START 1
#define FF_EFFECT_QUEUE_STOP 2
#define FF_EFFECT_PLAYING 3
#define FF_EFFECT_QUEUE_UPDATE 4

#define CLAMP_VALUE_U16(x) ((unsigned short)((x) > 0xffff ? 0xffff : (x)))
#define SCALE_VALUE_U16(x, bits) (CLAMP_VALUE_U16(x) >> (16 - bits))
#define JIFFIES2MS(jiffies) ((jiffies) * 1000 / HZ)

spinlock_t lock;
unsigned long lock_flags;

spinlock_t data_lock;
unsigned long data_flags;

static int timer_msecs = DEFAULT_TIMER_PERIOD;

static const signed short t300rs_ff_effects[] = {
    FF_CONSTANT,
    FF_RAMP,
    FF_SPRING,
    FF_DAMPER,
    FF_FRICTION,
    FF_INERTIA,
    FF_PERIODIC,
    FF_SINE,
    FF_TRIANGLE,
    FF_SQUARE,
    FF_SAW_UP,
    FF_SAW_DOWN,
    FF_AUTOCENTER,
    FF_GAIN,
    -1
};

struct t300rs_effect_state {
    struct ff_effect effect;
    struct ff_effect old;
    bool old_set;
    unsigned long flags;
    unsigned long start_time;
    unsigned long count;
};

struct t300rs_device_entry {
    struct hid_device *hdev;
    struct input_dev *input_dev;
    struct hid_report *report;
    struct hid_field *ff_field;
    struct usb_device *usbdev;
    struct usb_interface *usbif;
    struct t300rs_effect_state *states;
    struct hrtimer hrtimer;

    int (*open)(struct input_dev *dev);
    void (*close)(struct input_dev *dev);

    spinlock_t lock;
    unsigned long lock_flags;
    
    int max_id;
    u16 range;
    u8 effects_used;
};


struct t300rs_data{
    unsigned long quirks;
    void *device_props;
};

static __u8 t300rs_rdesc_fixed[] = {0x05, 0x01, 0x09, 0x04, 0xa1, 0x01, 0x09, 0x01, 0xa1, 0x00, 0x85, 0x07, 0x09, 0x30, 0x15, 0x00, 0x27, 0xff, 0xff, 0x00, 0x00, 0x35, 0x00, 0x47, 0xff, 0xff, 0x00, 0x00, 0x75, 0x10, 0x95, 0x01, 0x81, 0x02, 0x09, 0x35, 0x26, 0xff, 0x03, 0x46, 0xff, 0x03, 0x81, 0x02, 0x09, 0x32, 0x81, 0x02, 0x09, 0x31, 0x81, 0x02, 0x81, 0x03, 0x05, 0x09, 0x19, 0x01, 0x29, 0x0d, 0x25, 0x01, 0x45, 0x01, 0x75, 0x01, 0x95, 0x0d, 0x81, 0x02, 0x75, 0x0b, 0x95, 0x01, 0x81, 0x03, 0x05, 0x01, 0x09, 0x39, 0x25, 0x07, 0x46, 0x3b, 0x01, 0x55, 0x00, 0x65, 0x14, 0x75, 0x04, 0x81, 0x42, 0x65, 0x00, 0x81, 0x03, 0x85, 0x0a, 0x06, 0x00, 0xff, 0x09, 0x0a, 0x75, 0x08, 0x95, 0x3f, 0x26, 0xff, 0x7f, 0x16, 0x00, 0x80, 0x46, 0xff, 0x7f, 0x36, 0x00, 0x80, 0x91, 0x02, 0x85, 0x02, 0x09, 0x02, 0x81, 0x02, 0x09, 0x14, 0x85, 0x14, 0x81, 0x02, 0xc0, 0xc0,};

static u8 spring_values[] = {
    0xa6, 0x6a, 0xa6, 0x6a, 0xfe, 0xff, 0xfe, 0xff, 0xfe, 0xff, 0xfe, 0xff, 0xdf, 0x58, 0xa6, 0x6a, 0x06
};

static u8 damper_values[] = {
    0xfc, 0x7f, 0xfc, 0x7f, 0xfe, 0xff, 0xfe, 0xff, 0xfe, 0xff, 0xfe, 0xff, 0xfc, 0x7f, 0xfc, 0x7f, 0x07
};