/*
 * drivers/input/tablet/wacom_wac.c
 *
 *  USB Wacom tablet support - Wacom specific code
 *
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include "wacom_wac.h"
#include "wacom.h"
#include <linux/input/mt.h>

/* resolution for penabled devices */
#define WACOM_PL_RES            20
#define WACOM_PENPRTN_RES       40
#define WACOM_VOLITO_RES        50
#define WACOM_GRAPHIRE_RES      80
#define WACOM_INTUOS_RES        100
#define WACOM_INTUOS3_RES       200

/* Newer Cintiq and DTU have an offset between tablet and screen areas */
#define WACOM_DTU_OFFSET        200
#define WACOM_CINTIQ_OFFSET     400

/*
 * Scale factor relating reported contact size to logical contact area.
 * 2^14/pi is a good approximation on Intuos5 and 3rd-gen Bamboo
 */
#define WACOM_CONTACT_AREA_SCALE 2607

static void wacom_report_numbered_buttons(struct input_dev *input_dev,
                                int button_count, int mask);

/*
 * Percent of battery capacity for Graphire.
 * 8th value means AC online and show 100% capacity.
 */
static unsigned short batcap_gr[8] = { 1, 15, 25, 35, 50, 70, 100, 100 };

/*
 * Percent of battery capacity for Intuos4 WL, AC has a separate bit.
 */
static unsigned short batcap_i4[8] = { 1, 15, 30, 45, 60, 70, 85, 100 };

static void wacom_notify_battery(struct wacom_wac *wacom_wac,
        int bat_capacity, bool bat_charging, bool bat_connected,
        bool ps_connected)
{
        struct wacom *wacom = container_of(wacom_wac, struct wacom, wacom_wac);
        bool changed = wacom_wac->battery_capacity != bat_capacity  ||
                       wacom_wac->bat_charging     != bat_charging  ||
                       wacom_wac->bat_connected    != bat_connected ||
                       wacom_wac->ps_connected     != ps_connected;

        if (changed) {
                wacom_wac->battery_capacity = bat_capacity;
                wacom_wac->bat_charging = bat_charging;
                wacom_wac->bat_connected = bat_connected;
                wacom_wac->ps_connected = ps_connected;

                if (wacom->battery)
                        power_supply_changed(wacom->battery);
        }
}

static int wacom_penpartner_irq(struct wacom_wac *wacom)
{
        unsigned char *data = wacom->data;
        struct input_dev *input = wacom->pen_input;

        switch (data[0]) {
        case 1:
                if (data[5] & 0x80) {
                        wacom->tool[0] = (data[5] & 0x20) ? BTN_TOOL_RUBBER : BTN_TOOL_PEN;
                        wacom->id[0] = (data[5] & 0x20) ? ERASER_DEVICE_ID : STYLUS_DEVICE_ID;
                        input_report_key(input, wacom->tool[0], 1);
                        input_report_abs(input, ABS_MISC, wacom->id[0]); /* report tool id */
                        input_report_abs(input, ABS_X, get_unaligned_le16(&data[1]));
                        input_report_abs(input, ABS_Y, get_unaligned_le16(&data[3]));
                        input_report_abs(input, ABS_PRESSURE, (signed char)data[6] + 127);
                        input_report_key(input, BTN_TOUCH, ((signed char)data[6] > -127));
                        input_report_key(input, BTN_STYLUS, (data[5] & 0x40));
                } else {
                        input_report_key(input, wacom->tool[0], 0);
                        input_report_abs(input, ABS_MISC, 0); /* report tool id */
                        input_report_abs(input, ABS_PRESSURE, -1);
                        input_report_key(input, BTN_TOUCH, 0);
                }
                break;

        case 2:
                input_report_key(input, BTN_TOOL_PEN, 1);
                input_report_abs(input, ABS_MISC, STYLUS_DEVICE_ID); /* report tool id */
                input_report_abs(input, ABS_X, get_unaligned_le16(&data[1]));
                input_report_abs(input, ABS_Y, get_unaligned_le16(&data[3]));
                input_report_abs(input, ABS_PRESSURE, (signed char)data[6] + 127);
                input_report_key(input, BTN_TOUCH, ((signed char)data[6] > -80) && !(data[5] & 0x20));
                input_report_key(input, BTN_STYLUS, (data[5] & 0x40));
                break;

        default:
                dev_dbg(input->dev.parent,
                        "%s: received unknown report #%d\n", __func__, data[0]);
                return 0;
        }

        return 1;
}

static int wacom_pl_irq(struct wacom_wac *wacom)
{
        struct wacom_features *features = &wacom->features;
        unsigned char *data = wacom->data;
        struct input_dev *input = wacom->pen_input;
        int prox, pressure;

        if (data[0] != WACOM_REPORT_PENABLED) {
                dev_dbg(input->dev.parent,
                        "%s: received unknown report #%d\n", __func__, data[0]);
                return 0;
        }

        prox = data[1] & 0x40;

        if (!wacom->id[0]) {
                if ((data[0] & 0x10) || (data[4] & 0x20)) {
                        wacom->tool[0] = BTN_TOOL_RUBBER;
                        wacom->id[0] = ERASER_DEVICE_ID;
                }
                else {
                        wacom->tool[0] = BTN_TOOL_PEN;
                        wacom->id[0] = STYLUS_DEVICE_ID;
                }
        }

        /* If the eraser is in prox, STYLUS2 is always set. If we
         * mis-detected the type and notice that STYLUS2 isn't set
         * then force the eraser out of prox and let the pen in.
         */
        if (wacom->tool[0] == BTN_TOOL_RUBBER && !(data[4] & 0x20)) {
                input_report_key(input, BTN_TOOL_RUBBER, 0);
                input_report_abs(input, ABS_MISC, 0);
                input_sync(input);
                wacom->tool[0] = BTN_TOOL_PEN;
                wacom->id[0] = STYLUS_DEVICE_ID;
        }

        pressure = (signed char)((data[7] << 1) | ((data[4] >> 2) & 1));
        if (features->pressure_max > 255)
                pressure = (pressure << 1) | ((data[4] >> 6) & 1);
        pressure += (features->pressure_max + 1) / 2;

        input_report_abs(input, ABS_X, data[3] | (data[2] << 7) | ((data[1] & 0x03) << 14));
        input_report_abs(input, ABS_Y, data[6] | (data[5] << 7) | ((data[4] & 0x03) << 14));
        input_report_abs(input, ABS_PRESSURE, pressure);

        input_report_key(input, BTN_TOUCH, data[4] & 0x08);
        input_report_key(input, BTN_STYLUS, data[4] & 0x10);
        /* Only allow the stylus2 button to be reported for the pen tool. */
        input_report_key(input, BTN_STYLUS2, (wacom->tool[0] == BTN_TOOL_PEN) && (data[4] & 0x20));

        if (!prox)
                wacom->id[0] = 0;
        input_report_key(input, wacom->tool[0], prox);
        input_report_abs(input, ABS_MISC, wacom->id[0]);
        return 1;
}

static int wacom_ptu_irq(struct wacom_wac *wacom)
{
        unsigned char *data = wacom->data;
        struct input_dev *input = wacom->pen_input;

        if (data[0] != WACOM_REPORT_PENABLED) {
                dev_dbg(input->dev.parent,
                        "%s: received unknown report #%d\n", __func__, data[0]);
                return 0;
        }

        if (data[1] & 0x04) {
                input_report_key(input, BTN_TOOL_RUBBER, data[1] & 0x20);
                input_report_key(input, BTN_TOUCH, data[1] & 0x08);
                wacom->id[0] = ERASER_DEVICE_ID;
        } else {
                input_report_key(input, BTN_TOOL_PEN, data[1] & 0x20);
                input_report_key(input, BTN_TOUCH, data[1] & 0x01);
                wacom->id[0] = STYLUS_DEVICE_ID;
        }
        input_report_abs(input, ABS_MISC, wacom->id[0]); /* report tool id */
        input_report_abs(input, ABS_X, le16_to_cpup((__le16 *)&data[2]));
        input_report_abs(input, ABS_Y, le16_to_cpup((__le16 *)&data[4]));
        input_report_abs(input, ABS_PRESSURE, le16_to_cpup((__le16 *)&data[6]));
        input_report_key(input, BTN_STYLUS, data[1] & 0x02);
        input_report_key(input, BTN_STYLUS2, data[1] & 0x10);
        return 1;
}

static int wacom_dtu_irq(struct wacom_wac *wacom)
{
        unsigned char *data = wacom->data;
        struct input_dev *input = wacom->pen_input;
        int prox = data[1] & 0x20;

        dev_dbg(input->dev.parent,
                "%s: received report #%d", __func__, data[0]);

        if (prox) {
                /* Going into proximity select tool */
                wacom->tool[0] = (data[1] & 0x0c) ? BTN_TOOL_RUBBER : BTN_TOOL_PEN;
                if (wacom->tool[0] == BTN_TOOL_PEN)
                        wacom->id[0] = STYLUS_DEVICE_ID;
                else
                        wacom->id[0] = ERASER_DEVICE_ID;
        }
        input_report_key(input, BTN_STYLUS, data[1] & 0x02);
        input_report_key(input, BTN_STYLUS2, data[1] & 0x10);
        input_report_abs(input, ABS_X, le16_to_cpup((__le16 *)&data[2]));
        input_report_abs(input, ABS_Y, le16_to_cpup((__le16 *)&data[4]));
        input_report_abs(input, ABS_PRESSURE, ((data[7] & 0x01) << 8) | data[6]);
        input_report_key(input, BTN_TOUCH, data[1] & 0x05);
        if (!prox) /* out-prox */
                wacom->id[0] = 0;
        input_report_key(input, wacom->tool[0], prox);
        input_report_abs(input, ABS_MISC, wacom->id[0]);
        return 1;
}

static int wacom_dtus_irq(struct wacom_wac *wacom)
{
        char *data = wacom->data;
        struct input_dev *input = wacom->pen_input;
        unsigned short prox, pressure = 0;

        if (data[0] != WACOM_REPORT_DTUS && data[0] != WACOM_REPORT_DTUSPAD) {
                dev_dbg(input->dev.parent,
                        "%s: received unknown report #%d", __func__, data[0]);
                return 0;
        } else if (data[0] == WACOM_REPORT_DTUSPAD) {
                input = wacom->pad_input;
                input_report_key(input, BTN_0, (data[1] & 0x01));
                input_report_key(input, BTN_1, (data[1] & 0x02));
                input_report_key(input, BTN_2, (data[1] & 0x04));
                input_report_key(input, BTN_3, (data[1] & 0x08));
                input_report_abs(input, ABS_MISC,
                                 data[1] & 0x0f ? PAD_DEVICE_ID : 0);
                return 1;
        } else {
                prox = data[1] & 0x80;
                if (prox) {
                        switch ((data[1] >> 3) & 3) {
                        case 1: /* Rubber */
                                wacom->tool[0] = BTN_TOOL_RUBBER;
                                wacom->id[0] = ERASER_DEVICE_ID;
                                break;

                        case 2: /* Pen */
                                wacom->tool[0] = BTN_TOOL_PEN;
                                wacom->id[0] = STYLUS_DEVICE_ID;
                                break;
                        }
                }

                input_report_key(input, BTN_STYLUS, data[1] & 0x20);
                input_report_key(input, BTN_STYLUS2, data[1] & 0x40);
                input_report_abs(input, ABS_X, get_unaligned_be16(&data[3]));
                input_report_abs(input, ABS_Y, get_unaligned_be16(&data[5]));
                pressure = ((data[1] & 0x03) << 8) | (data[2] & 0xff);
                input_report_abs(input, ABS_PRESSURE, pressure);
                input_report_key(input, BTN_TOUCH, pressure > 10);

                if (!prox) /* out-prox */
                        wacom->id[0] = 0;
                input_report_key(input, wacom->tool[0], prox);
                input_report_abs(input, ABS_MISC, wacom->id[0]);
                return 1;
        }
}

static int wacom_graphire_irq(struct wacom_wac *wacom)
{
        struct wacom_features *features = &wacom->features;
        unsigned char *data = wacom->data;
        struct input_dev *input = wacom->pen_input;
        struct input_dev *pad_input = wacom->pad_input;
        int battery_capacity, ps_connected;
        int prox;
        int rw = 0;
        int retval = 0;

        if (features->type == GRAPHIRE_BT) {
                if (data[0] != WACOM_REPORT_PENABLED_BT) {
                        dev_dbg(input->dev.parent,
                                "%s: received unknown report #%d\n", __func__,
                                data[0]);
                        goto exit;
                }
        } else if (data[0] != WACOM_REPORT_PENABLED) {
                dev_dbg(input->dev.parent,
                        "%s: received unknown report #%d\n", __func__, data[0]);
                goto exit;
        }

        prox = data[1] & 0x80;
        if (prox || wacom->id[0]) {
                if (prox) {
                        switch ((data[1] >> 5) & 3) {

                        case 0: /* Pen */
                                wacom->tool[0] = BTN_TOOL_PEN;
                                wacom->id[0] = STYLUS_DEVICE_ID;
                                break;

                        case 1: /* Rubber */
                                wacom->tool[0] = BTN_TOOL_RUBBER;
                                wacom->id[0] = ERASER_DEVICE_ID;
                                break;

                        case 2: /* Mouse with wheel */
                                input_report_key(input, BTN_MIDDLE, data[1] & 0x04);
                                /* fall through */

                        case 3: /* Mouse without wheel */
                                wacom->tool[0] = BTN_TOOL_MOUSE;
                                wacom->id[0] = CURSOR_DEVICE_ID;
                                break;
                        }
                }
                input_report_abs(input, ABS_X, le16_to_cpup((__le16 *)&data[2]));
                input_report_abs(input, ABS_Y, le16_to_cpup((__le16 *)&data[4]));
                if (wacom->tool[0] != BTN_TOOL_MOUSE) {
                        if (features->type == GRAPHIRE_BT)
                                input_report_abs(input, ABS_PRESSURE, data[6] |
                                        (((__u16) (data[1] & 0x08)) << 5));
                        else
                                input_report_abs(input, ABS_PRESSURE, data[6] |
                                        ((data[7] & 0x03) << 8));
                        input_report_key(input, BTN_TOUCH, data[1] & 0x01);
                        input_report_key(input, BTN_STYLUS, data[1] & 0x02);
                        input_report_key(input, BTN_STYLUS2, data[1] & 0x04);
                } else {
                        input_report_key(input, BTN_LEFT, data[1] & 0x01);
                        input_report_key(input, BTN_RIGHT, data[1] & 0x02);
                        if (features->type == WACOM_G4 ||
                                        features->type == WACOM_MO) {
                                input_report_abs(input, ABS_DISTANCE, data[6] & 0x3f);
                                rw = (data[7] & 0x04) - (data[7] & 0x03);
                        } else if (features->type == GRAPHIRE_BT) {
                                /* Compute distance between mouse and tablet */
                                rw = 44 - (data[6] >> 2);
                                rw = clamp_val(rw, 0, 31);
                                input_report_abs(input, ABS_DISTANCE, rw);
                                if (((data[1] >> 5) & 3) == 2) {
                                        /* Mouse with wheel */
                                        input_report_key(input, BTN_MIDDLE,
                                                        data[1] & 0x04);
                                        rw = (data[6] & 0x01) ? -1 :
                                                (data[6] & 0x02) ? 1 : 0;
                                } else {
                                        rw = 0;
                                }
                        } else {
                                input_report_abs(input, ABS_DISTANCE, data[7] & 0x3f);
                                rw = -(signed char)data[6];
                        }
                        input_report_rel(input, REL_WHEEL, rw);
                }

                if (!prox)
                        wacom->id[0] = 0;
                input_report_abs(input, ABS_MISC, wacom->id[0]); /* report tool id */
                input_report_key(input, wacom->tool[0], prox);
                input_sync(input); /* sync last event */
        }

        /* send pad data */
        switch (features->type) {
        case WACOM_G4:
                prox = data[7] & 0xf8;
                if (prox || wacom->id[1]) {
                        wacom->id[1] = PAD_DEVICE_ID;
                        input_report_key(pad_input, BTN_BACK, (data[7] & 0x40));
                        input_report_key(pad_input, BTN_FORWARD, (data[7] & 0x80));
                        rw = ((data[7] & 0x18) >> 3) - ((data[7] & 0x20) >> 3);
                        input_report_rel(pad_input, REL_WHEEL, rw);
                        if (!prox)
                                wacom->id[1] = 0;
                        input_report_abs(pad_input, ABS_MISC, wacom->id[1]);
                        retval = 1;
                }
                break;

        case WACOM_MO:
                prox = (data[7] & 0xf8) || data[8];
                if (prox || wacom->id[1]) {
                        wacom->id[1] = PAD_DEVICE_ID;
                        input_report_key(pad_input, BTN_BACK, (data[7] & 0x08));
                        input_report_key(pad_input, BTN_LEFT, (data[7] & 0x20));
                        input_report_key(pad_input, BTN_FORWARD, (data[7] & 0x10));
                        input_report_key(pad_input, BTN_RIGHT, (data[7] & 0x40));
                        input_report_abs(pad_input, ABS_WHEEL, (data[8] & 0x7f));
                        if (!prox)
                                wacom->id[1] = 0;
                        input_report_abs(pad_input, ABS_MISC, wacom->id[1]);
                        retval = 1;
                }
                break;
        case GRAPHIRE_BT:
                prox = data[7] & 0x03;
                if (prox || wacom->id[1]) {
                        wacom->id[1] = PAD_DEVICE_ID;
                        input_report_key(pad_input, BTN_0, (data[7] & 0x02));
                        input_report_key(pad_input, BTN_1, (data[7] & 0x01));
                        if (!prox)
                                wacom->id[1] = 0;
                        input_report_abs(pad_input, ABS_MISC, wacom->id[1]);
                        retval = 1;
                }
                break;
        }

        /* Store current battery capacity and power supply state */
        if (features->type == GRAPHIRE_BT) {
                rw = (data[7] >> 2 & 0x07);
                battery_capacity = batcap_gr[rw];
                ps_connected = rw == 7;
                wacom_notify_battery(wacom, battery_capacity, ps_connected,
                                     1, ps_connected);
        }
exit:
        return retval;
}

static void wacom_intuos_schedule_prox_event(struct wacom_wac *wacom_wac)
{
        struct wacom *wacom = container_of(wacom_wac, struct wacom, wacom_wac);
        struct wacom_features *features = &wacom_wac->features;
        struct hid_report *r;
        struct hid_report_enum *re;

        re = &(wacom->hdev->report_enum[HID_FEATURE_REPORT]);
        if (features->type == INTUOSHT2)
                r = re->report_id_hash[WACOM_REPORT_INTUOSHT2_ID];
        else
                r = re->report_id_hash[WACOM_REPORT_INTUOS_ID1];
        if (r) {
                hid_hw_request(wacom->hdev, r, HID_REQ_GET_REPORT);
        }
}

static int wacom_intuos_pad(struct wacom_wac *wacom)
{
        struct wacom_features *features = &wacom->features;
        unsigned char *data = wacom->data;
        struct input_dev *input = wacom->pad_input;
        int i;
        int buttons = 0, nbuttons = features->numbered_buttons;
        int keys = 0, nkeys = 0;
        int ring1 = 0, ring2 = 0;
        int strip1 = 0, strip2 = 0;
        bool prox = false;

        /* pad packets. Works as a second tool and is always in prox */
        if (!(data[0] == WACOM_REPORT_INTUOSPAD || data[0] == WACOM_REPORT_INTUOS5PAD ||
              data[0] == WACOM_REPORT_CINTIQPAD))
                return 0;

        if (features->type >= INTUOS4S && features->type <= INTUOS4L) {
                buttons = (data[3] << 1) | (data[2] & 0x01);
                ring1 = data[1];
        } else if (features->type == DTK) {
                buttons = data[6];
        } else if (features->type == WACOM_13HD) {
                buttons = (data[4] << 1) | (data[3] & 0x01);
        } else if (features->type == WACOM_24HD) {
                buttons = (data[8] << 8) | data[6];
                ring1 = data[1];
                ring2 = data[2];

                /*
                 * Three "buttons" are available on the 24HD which are
                 * physically implemented as a touchstrip. Each button
                 * is approximately 3 bits wide with a 2 bit spacing.
                 * The raw touchstrip bits are stored at:
                 *    ((data[3] & 0x1f) << 8) | data[4])
                 */
                nkeys = 3;
                keys = ((data[3] & 0x1C) ? 1<<2 : 0) |
                       ((data[4] & 0xE0) ? 1<<1 : 0) |
                       ((data[4] & 0x07) ? 1<<0 : 0);
        } else if (features->type == WACOM_27QHD) {
                nkeys = 3;
                keys = data[2] & 0x07;

                input_report_abs(input, ABS_X, be16_to_cpup((__be16 *)&data[4]));
                input_report_abs(input, ABS_Y, be16_to_cpup((__be16 *)&data[6]));
                input_report_abs(input, ABS_Z, be16_to_cpup((__be16 *)&data[8]));
        } else if (features->type == CINTIQ_HYBRID) {
                /*
                 * Do not send hardware buttons under Android. They
                 * are already sent to the system through GPIO (and
                 * have different meaning).
                 *
                 * d-pad right  -> data[4] & 0x10
                 * d-pad up     -> data[4] & 0x20
                 * d-pad left   -> data[4] & 0x40
                 * d-pad down   -> data[4] & 0x80
                 * d-pad center -> data[3] & 0x01
                 */
                buttons = (data[4] << 1) | (data[3] & 0x01);
        } else if (features->type == CINTIQ_COMPANION_2) {
                /* d-pad right  -> data[4] & 0x10
                 * d-pad up     -> data[4] & 0x20
                 * d-pad left   -> data[4] & 0x40
                 * d-pad down   -> data[4] & 0x80
                 * d-pad center -> data[3] & 0x01
                 */
                buttons = ((data[2] >> 4) << 7) |
                          ((data[1] & 0x04) << 6) |
                          ((data[2] & 0x0F) << 2) |
                          (data[1] & 0x03);
        } else if (features->type >= INTUOS5S && features->type <= INTUOSPL) {
                /*
                 * ExpressKeys on Intuos5/Intuos Pro have a capacitive sensor in
                 * addition to the mechanical switch. Switch data is
                 * stored in data[4], capacitive data in data[5].
                 *
                 * Touch ring mode switch (data[3]) has no capacitive sensor
                 */
                buttons = (data[4] << 1) | (data[3] & 0x01);
                ring1 = data[2];
        } else {
                if (features->type == WACOM_21UX2 || features->type == WACOM_22HD) {
                        buttons = (data[8] << 10) | ((data[7] & 0x01) << 9) |
                                  (data[6] << 1) | (data[5] & 0x01);

                        if (features->type == WACOM_22HD) {
                                nkeys = 3;
                                keys = data[9] & 0x07;
                        }
                } else {
                        buttons = ((data[6] & 0x10) << 10) |
                                  ((data[5] & 0x10) << 9)  |
                                  ((data[6] & 0x0F) << 4)  |
                                  (data[5] & 0x0F);
                }
                strip1 = ((data[1] & 0x1f) << 8) | data[2];
                strip2 = ((data[3] & 0x1f) << 8) | data[4];
        }

        prox = (buttons & ~(~0 << nbuttons)) | (keys & ~(~0 << nkeys)) |
               (ring1 & 0x80) | (ring2 & 0x80) | strip1 | strip2;

        wacom_report_numbered_buttons(input, nbuttons, buttons);

        for (i = 0; i < nkeys; i++)
                input_report_key(input, KEY_PROG1 + i, keys & (1 << i));

        input_report_abs(input, ABS_RX, strip1);
        input_report_abs(input, ABS_RY, strip2);

        input_report_abs(input, ABS_WHEEL,    (ring1 & 0x80) ? (ring1 & 0x7f) : 0);
        input_report_abs(input, ABS_THROTTLE, (ring2 & 0x80) ? (ring2 & 0x7f) : 0);

        input_report_key(input, wacom->tool[1], prox ? 1 : 0);
        input_report_abs(input, ABS_MISC, prox ? PAD_DEVICE_ID : 0);

        input_event(input, EV_MSC, MSC_SERIAL, 0xffffffff);

        return 1;
}

static int wacom_intuos_get_tool_type(int tool_id)
{
        int tool_type;

        switch (tool_id) {
        case 0x812: /* Inking pen */
        case 0x801: /* Intuos3 Inking pen */
        case 0x120802: /* Intuos4/5 Inking Pen */
        case 0x012:
                tool_type = BTN_TOOL_PENCIL;
                break;

        case 0x822: /* Pen */
        case 0x842:
        case 0x852:
        case 0x823: /* Intuos3 Grip Pen */
        case 0x813: /* Intuos3 Classic Pen */
        case 0x885: /* Intuos3 Marker Pen */
        case 0x802: /* Intuos4/5 13HD/24HD General Pen */
        case 0x804: /* Intuos4/5 13HD/24HD Marker Pen */
        case 0x8e2: /* IntuosHT2 pen */
        case 0x022:
        case 0x100804: /* Intuos4/5 13HD/24HD Art Pen */
        case 0x140802: /* Intuos4/5 13HD/24HD Classic Pen */
        case 0x160802: /* Cintiq 13HD Pro Pen */
        case 0x180802: /* DTH2242 Pen */
        case 0x100802: /* Intuos4/5 13HD/24HD General Pen */
                tool_type = BTN_TOOL_PEN;
                break;

        case 0x832: /* Stroke pen */
        case 0x032:
                tool_type = BTN_TOOL_BRUSH;
                break;

        case 0x007: /* Mouse 4D and 2D */
        case 0x09c:
        case 0x094:
        case 0x017: /* Intuos3 2D Mouse */
        case 0x806: /* Intuos4 Mouse */
                tool_type = BTN_TOOL_MOUSE;
                break;

        case 0x096: /* Lens cursor */
        case 0x097: /* Intuos3 Lens cursor */
        case 0x006: /* Intuos4 Lens cursor */
                tool_type = BTN_TOOL_LENS;
                break;

        case 0x82a: /* Eraser */
        case 0x85a:
        case 0x91a:
        case 0xd1a:
        case 0x0fa:
        case 0x82b: /* Intuos3 Grip Pen Eraser */
        case 0x81b: /* Intuos3 Classic Pen Eraser */
        case 0x91b: /* Intuos3 Airbrush Eraser */
        case 0x80c: /* Intuos4/5 13HD/24HD Marker Pen Eraser */
        case 0x80a: /* Intuos4/5 13HD/24HD General Pen Eraser */
        case 0x90a: /* Intuos4/5 13HD/24HD Airbrush Eraser */
        case 0x14080a: /* Intuos4/5 13HD/24HD Classic Pen Eraser */
        case 0x10090a: /* Intuos4/5 13HD/24HD Airbrush Eraser */
        case 0x10080c: /* Intuos4/5 13HD/24HD Art Pen Eraser */
        case 0x16080a: /* Cintiq 13HD Pro Pen Eraser */
        case 0x18080a: /* DTH2242 Eraser */
        case 0x10080a: /* Intuos4/5 13HD/24HD General Pen Eraser */
                tool_type = BTN_TOOL_RUBBER;
                break;

        case 0xd12:
        case 0x912:
        case 0x112:
        case 0x913: /* Intuos3 Airbrush */
        case 0x902: /* Intuos4/5 13HD/24HD Airbrush */
        case 0x100902: /* Intuos4/5 13HD/24HD Airbrush */
                tool_type = BTN_TOOL_AIRBRUSH;
                break;

        default: /* Unknown tool */
                tool_type = BTN_TOOL_PEN;
                break;
        }
        return tool_type;
}

static int wacom_intuos_inout(struct wacom_wac *wacom)
{
        struct wacom_features *features = &wacom->features;
        unsigned char *data = wacom->data;
        struct input_dev *input = wacom->pen_input;
        int idx = (features->type == INTUOS) ? (data[1] & 0x01) : 0;

        if (!(((data[1] & 0xfc) == 0xc0) ||  /* in prox */
            ((data[1] & 0xfe) == 0x20) ||    /* in range */
            ((data[1] & 0xfe) == 0x80)))     /* out prox */
                return 0;

        /* Enter report */
        if ((data[1] & 0xfc) == 0xc0) {
                /* serial number of the tool */
                wacom->serial[idx] = ((data[3] & 0x0f) << 28) +
                        (data[4] << 20) + (data[5] << 12) +
                        (data[6] << 4) + (data[7] >> 4);

                wacom->id[idx] = (data[2] << 4) | (data[3] >> 4) |
                        ((data[7] & 0x0f) << 20) | ((data[8] & 0xf0) << 12);

                wacom->tool[idx] = wacom_intuos_get_tool_type(wacom->id[idx]);

                wacom->shared->stylus_in_proximity = true;
                return 1;
        }

        /* in Range */
        if ((data[1] & 0xfe) == 0x20) {
                if (features->type != INTUOSHT2)
                        wacom->shared->stylus_in_proximity = true;

                /* in Range while exiting */
                if (wacom->reporting_data) {
                        input_report_key(input, BTN_TOUCH, 0);
                        input_report_abs(input, ABS_PRESSURE, 0);
                        input_report_abs(input, ABS_DISTANCE, wacom->features.distance_max);
                        return 2;
                }
                return 1;
        }

        /* Exit report */
        if ((data[1] & 0xfe) == 0x80) {
                wacom->shared->stylus_in_proximity = false;
                wacom->reporting_data = false;

                /* don't report exit if we don't know the ID */
                if (!wacom->id[idx])
                        return 1;

                /*
                 * Reset all states otherwise we lose the initial states
                 * when in-prox next time
                 */
                input_report_abs(input, ABS_X, 0);
                input_report_abs(input, ABS_Y, 0);
                input_report_abs(input, ABS_DISTANCE, 0);
                input_report_abs(input, ABS_TILT_X, 0);
                input_report_abs(input, ABS_TILT_Y, 0);
                if (wacom->tool[idx] >= BTN_TOOL_MOUSE) {
                        input_report_key(input, BTN_LEFT, 0);
                        input_report_key(input, BTN_MIDDLE, 0);
                        input_report_key(input, BTN_RIGHT, 0);
                        input_report_key(input, BTN_SIDE, 0);
                        input_report_key(input, BTN_EXTRA, 0);
                        input_report_abs(input, ABS_THROTTLE, 0);
                        input_report_abs(input, ABS_RZ, 0);
                } else {
                        input_report_abs(input, ABS_PRESSURE, 0);
                        input_report_key(input, BTN_STYLUS, 0);
                        input_report_key(input, BTN_STYLUS2, 0);
                        input_report_key(input, BTN_TOUCH, 0);
                        input_report_abs(input, ABS_WHEEL, 0);
                        if (features->type >= INTUOS3S)
                                input_report_abs(input, ABS_Z, 0);
                }
                input_report_key(input, wacom->tool[idx], 0);
                input_report_abs(input, ABS_MISC, 0); /* reset tool id */
                input_event(input, EV_MSC, MSC_SERIAL, wacom->serial[idx]);
                wacom->id[idx] = 0;
                return 2;
        }

        return 0;
}

static int wacom_remote_irq(struct wacom_wac *wacom_wac, size_t len)
{
        unsigned char *data = wacom_wac->data;
        struct input_dev *input = wacom_wac->pad_input;
        struct wacom *wacom = container_of(wacom_wac, struct wacom, wacom_wac);
        struct wacom_features *features = &wacom_wac->features;
        int bat_charging, bat_percent, touch_ring_mode;
        __u32 serial;
        int i;

        if (data[0] != WACOM_REPORT_REMOTE) {
                dev_dbg(input->dev.parent,
                        "%s: received unknown report #%d", __func__, data[0]);
                return 0;
        }

        serial = data[3] + (data[4] << 8) + (data[5] << 16);
        wacom_wac->id[0] = PAD_DEVICE_ID;

        input_report_key(input, BTN_0, (data[9] & 0x01));
        input_report_key(input, BTN_1, (data[9] & 0x02));
        input_report_key(input, BTN_2, (data[9] & 0x04));
        input_report_key(input, BTN_3, (data[9] & 0x08));
        input_report_key(input, BTN_4, (data[9] & 0x10));
        input_report_key(input, BTN_5, (data[9] & 0x20));
        input_report_key(input, BTN_6, (data[9] & 0x40));
        input_report_key(input, BTN_7, (data[9] & 0x80));

        input_report_key(input, BTN_8, (data[10] & 0x01));
        input_report_key(input, BTN_9, (data[10] & 0x02));
        input_report_key(input, BTN_A, (data[10] & 0x04));
        input_report_key(input, BTN_B, (data[10] & 0x08));
        input_report_key(input, BTN_C, (data[10] & 0x10));
        input_report_key(input, BTN_X, (data[10] & 0x20));
        input_report_key(input, BTN_Y, (data[10] & 0x40));
        input_report_key(input, BTN_Z, (data[10] & 0x80));

        input_report_key(input, BTN_BASE, (data[11] & 0x01));
        input_report_key(input, BTN_BASE2, (data[11] & 0x02));

        if (data[12] & 0x80)
                input_report_abs(input, ABS_WHEEL, (data[12] & 0x7f));
        else
                input_report_abs(input, ABS_WHEEL, 0);

        bat_percent = data[7] & 0x7f;
        bat_charging = !!(data[7] & 0x80);

        if (data[9] | data[10] | (data[11] & 0x03) | data[12])
                input_report_abs(input, ABS_MISC, PAD_DEVICE_ID);
        else
                input_report_abs(input, ABS_MISC, 0);

        input_event(input, EV_MSC, MSC_SERIAL, serial);

        /*Which mode select (LED light) is currently on?*/
        touch_ring_mode = (data[11] & 0xC0) >> 6;

        for (i = 0; i < WACOM_MAX_REMOTES; i++) {
                if (wacom_wac->serial[i] == serial)
                        wacom->led.select[i] = touch_ring_mode;
        }

        if (!wacom->battery &&
            !(features->quirks & WACOM_QUIRK_BATTERY)) {
                features->quirks |= WACOM_QUIRK_BATTERY;
                INIT_WORK(&wacom->work, wacom_battery_work);
                wacom_schedule_work(wacom_wac);
        }

        wacom_notify_battery(wacom_wac, bat_percent, bat_charging, 1,
                             bat_charging);

        return 1;
}

static int wacom_remote_status_irq(struct wacom_wac *wacom_wac, size_t len)
{
        struct wacom *wacom = container_of(wacom_wac, struct wacom, wacom_wac);
        unsigned char *data = wacom_wac->data;
        int i;

        if (data[0] != WACOM_REPORT_DEVICE_LIST)
                return 0;

        for (i = 0; i < WACOM_MAX_REMOTES; i++) {
                int j = i * 6;
                int serial = (data[j+6] << 16) + (data[j+5] << 8) + data[j+4];
                bool connected = data[j+2];

                if (connected) {
                        int k;

                        if (wacom_wac->serial[i] == serial)
                                continue;

                        if (wacom_wac->serial[i]) {
                                wacom_remote_destroy_attr_group(wacom,
                                                        wacom_wac->serial[i]);
                        }

                        /* A remote can pair more than once with an EKR,
                         * check to make sure this serial isn't already paired.
                         */
                        for (k = 0; k < WACOM_MAX_REMOTES; k++) {
                                if (wacom_wac->serial[k] == serial)
                                        break;
                        }

                        if (k < WACOM_MAX_REMOTES) {
                                wacom_wac->serial[i] = serial;
                                continue;
                        }
                        wacom_remote_create_attr_group(wacom, serial, i);

                } else if (wacom_wac->serial[i]) {
                        wacom_remote_destroy_attr_group(wacom,
                                                        wacom_wac->serial[i]);
                }
        }

        return 0;
}

static int wacom_intuos_general(struct wacom_wac *wacom)
{
        struct wacom_features *features = &wacom->features;
        unsigned char *data = wacom->data;
        struct input_dev *input = wacom->pen_input;
        int idx = (features->type == INTUOS) ? (data[1] & 0x01) : 0;
        unsigned char type = (data[1] >> 1) & 0x0F;
        unsigned int x, y, distance, t;

        if (data[0] != WACOM_REPORT_PENABLED && data[0] != WACOM_REPORT_CINTIQ &&
                data[0] != WACOM_REPORT_INTUOS_PEN)
                return 0;

        if (wacom->shared->touch_down)
                return 1;

        /* don't report events if we don't know the tool ID */
        if (!wacom->id[idx]) {
                /* but reschedule a read of the current tool */
                wacom_intuos_schedule_prox_event(wacom);
                return 1;
        }

        /*
         * don't report events for invalid data
         */
        /* older I4 styli don't work with new Cintiqs */
        if ((!((wacom->id[idx] >> 20) & 0x01) &&
                        (features->type == WACOM_21UX2)) ||
            /* Only large Intuos support Lense Cursor */
            (wacom->tool[idx] == BTN_TOOL_LENS &&
                (features->type == INTUOS3 ||
                 features->type == INTUOS3S ||
                 features->type == INTUOS4 ||
                 features->type == INTUOS4S ||
                 features->type == INTUOS5 ||
                 features->type == INTUOS5S ||
                 features->type == INTUOSPM ||
                 features->type == INTUOSPS)) ||
           /* Cintiq doesn't send data when RDY bit isn't set */
           (features->type == CINTIQ && !(data[1] & 0x40)))
                return 1;

        x = (be16_to_cpup((__be16 *)&data[2]) << 1) | ((data[9] >> 1) & 1);
        y = (be16_to_cpup((__be16 *)&data[4]) << 1) | (data[9] & 1);
        distance = data[9] >> 2;
        if (features->type < INTUOS3S) {
                x >>= 1;
                y >>= 1;
                distance >>= 1;
        }
        input_report_abs(input, ABS_X, x);
        input_report_abs(input, ABS_Y, y);
        input_report_abs(input, ABS_DISTANCE, distance);

        switch (type) {
        case 0x00:
        case 0x01:
        case 0x02:
        case 0x03:
                /* general pen packet */
                t = (data[6] << 3) | ((data[7] & 0xC0) >> 5) | (data[1] & 1);
                if (features->pressure_max < 2047)
                        t >>= 1;
                input_report_abs(input, ABS_PRESSURE, t);
                if (features->type != INTUOSHT2) {
                    input_report_abs(input, ABS_TILT_X,
                                 (((data[7] << 1) & 0x7e) | (data[8] >> 7)) - 64);
                    input_report_abs(input, ABS_TILT_Y, (data[8] & 0x7f) - 64);
                }
                input_report_key(input, BTN_STYLUS, data[1] & 2);
                input_report_key(input, BTN_STYLUS2, data[1] & 4);
                input_report_key(input, BTN_TOUCH, t > 10);
                break;

        case 0x0a:
                /* airbrush second packet */
                input_report_abs(input, ABS_WHEEL,
                                (data[6] << 2) | ((data[7] >> 6) & 3));
                input_report_abs(input, ABS_TILT_X,
                                 (((data[7] << 1) & 0x7e) | (data[8] >> 7)) - 64);
                input_report_abs(input, ABS_TILT_Y, (data[8] & 0x7f) - 64);
                break;

        case 0x05:
                /* Rotation packet */
                if (features->type >= INTUOS3S) {
                        /* I3 marker pen rotation */
                        t = (data[6] << 3) | ((data[7] >> 5) & 7);
                        t = (data[7] & 0x20) ? ((t > 900) ? ((t-1) / 2 - 1350) :
                                ((t-1) / 2 + 450)) : (450 - t / 2) ;
                        input_report_abs(input, ABS_Z, t);
                } else {
                        /* 4D mouse 2nd packet */
                        t = (data[6] << 3) | ((data[7] >> 5) & 7);
                        input_report_abs(input, ABS_RZ, (data[7] & 0x20) ?
                                ((t - 1) / 2) : -t / 2);
                }
                break;

        case 0x04:
                /* 4D mouse 1st packet */
                input_report_key(input, BTN_LEFT,   data[8] & 0x01);
                input_report_key(input, BTN_MIDDLE, data[8] & 0x02);
                input_report_key(input, BTN_RIGHT,  data[8] & 0x04);

                input_report_key(input, BTN_SIDE,   data[8] & 0x20);
                input_report_key(input, BTN_EXTRA,  data[8] & 0x10);
                t = (data[6] << 2) | ((data[7] >> 6) & 3);
                input_report_abs(input, ABS_THROTTLE, (data[8] & 0x08) ? -t : t);
                break;

        case 0x06:
                /* I4 mouse */
                input_report_key(input, BTN_LEFT,   data[6] & 0x01);
                input_report_key(input, BTN_MIDDLE, data[6] & 0x02);
                input_report_key(input, BTN_RIGHT,  data[6] & 0x04);
                input_report_rel(input, REL_WHEEL, ((data[7] & 0x80) >> 7)
                                 - ((data[7] & 0x40) >> 6));
                input_report_key(input, BTN_SIDE,   data[6] & 0x08);
                input_report_key(input, BTN_EXTRA,  data[6] & 0x10);

                input_report_abs(input, ABS_TILT_X,
                        (((data[7] << 1) & 0x7e) | (data[8] >> 7)) - 64);
                input_report_abs(input, ABS_TILT_Y, (data[8] & 0x7f) - 64);
                break;

        case 0x08:
                if (wacom->tool[idx] == BTN_TOOL_MOUSE) {
                        /* 2D mouse packet */
                        input_report_key(input, BTN_LEFT,   data[8] & 0x04);
                        input_report_key(input, BTN_MIDDLE, data[8] & 0x08);
                        input_report_key(input, BTN_RIGHT,  data[8] & 0x10);
                        input_report_rel(input, REL_WHEEL, (data[8] & 0x01)
                                         - ((data[8] & 0x02) >> 1));

                        /* I3 2D mouse side buttons */
                        if (features->type >= INTUOS3S && features->type <= INTUOS3L) {
                                input_report_key(input, BTN_SIDE,   data[8] & 0x40);
                                input_report_key(input, BTN_EXTRA,  data[8] & 0x20);
                        }
                }
                else if (wacom->tool[idx] == BTN_TOOL_LENS) {
                        /* Lens cursor packets */
                        input_report_key(input, BTN_LEFT,   data[8] & 0x01);
                        input_report_key(input, BTN_MIDDLE, data[8] & 0x02);
                        input_report_key(input, BTN_RIGHT,  data[8] & 0x04);
                        input_report_key(input, BTN_SIDE,   data[8] & 0x10);
                        input_report_key(input, BTN_EXTRA,  data[8] & 0x08);
                }
                break;

        case 0x07:
        case 0x09:
        case 0x0b:
        case 0x0c:
        case 0x0d:
        case 0x0e:
        case 0x0f:
                /* unhandled */
                break;
        }

        input_report_abs(input, ABS_MISC, wacom->id[idx]); /* report tool id */
        input_report_key(input, wacom->tool[idx], 1);
        input_event(input, EV_MSC, MSC_SERIAL, wacom->serial[idx]);
        wacom->reporting_data = true;
        return 2;
}

static int wacom_intuos_irq(struct wacom_wac *wacom)
{
        unsigned char *data = wacom->data;
        struct input_dev *input = wacom->pen_input;
        int result;

        if (data[0] != WACOM_REPORT_PENABLED &&
            data[0] != WACOM_REPORT_INTUOS_ID1 &&
            data[0] != WACOM_REPORT_INTUOS_ID2 &&
            data[0] != WACOM_REPORT_INTUOSPAD &&
            data[0] != WACOM_REPORT_INTUOS_PEN &&
            data[0] != WACOM_REPORT_CINTIQ &&
            data[0] != WACOM_REPORT_CINTIQPAD &&
            data[0] != WACOM_REPORT_INTUOS5PAD) {
                dev_dbg(input->dev.parent,
                        "%s: received unknown report #%d\n", __func__, data[0]);
                return 0;
        }

        /* process pad events */
        result = wacom_intuos_pad(wacom);
        if (result)
                return result;

        /* process in/out prox events */
        result = wacom_intuos_inout(wacom);
        if (result)
                return result - 1;

        /* process general packets */
        result = wacom_intuos_general(wacom);
        if (result)
                return result - 1;

        return 0;
}

static int int_dist(int x1, int y1, int x2, int y2)
{
        int x = x2 - x1;
        int y = y2 - y1;

        return int_sqrt(x*x + y*y);
}

static void wacom_intuos_bt_process_data(struct wacom_wac *wacom,
                unsigned char *data)
{
        memcpy(wacom->data, data, 10);
        wacom_intuos_irq(wacom);

        input_sync(wacom->pen_input);
        if (wacom->pad_input)
                input_sync(wacom->pad_input);
}

static int wacom_intuos_bt_irq(struct wacom_wac *wacom, size_t len)
{
        unsigned char data[WACOM_PKGLEN_MAX];
        int i = 1;
        unsigned power_raw, battery_capacity, bat_charging, ps_connected;

        memcpy(data, wacom->data, len);

        switch (data[0]) {
        case 0x04:
                wacom_intuos_bt_process_data(wacom, data + i);
                i += 10;
                /* fall through */
        case 0x03:
                wacom_intuos_bt_process_data(wacom, data + i);
                i += 10;
                wacom_intuos_bt_process_data(wacom, data + i);
                i += 10;
                power_raw = data[i];
                bat_charging = (power_raw & 0x08) ? 1 : 0;
                ps_connected = (power_raw & 0x10) ? 1 : 0;
                battery_capacity = batcap_i4[power_raw & 0x07];
                wacom_notify_battery(wacom, battery_capacity, bat_charging,
                                     battery_capacity || bat_charging,
                                     ps_connected);
                break;
        default:
                dev_dbg(wacom->pen_input->dev.parent,
                                "Unknown report: %d,%d size:%zu\n",
                                data[0], data[1], len);
                return 0;
        }
        return 0;
}

static int wacom_wac_finger_count_touches(struct wacom_wac *wacom)
{
        struct input_dev *input = wacom->touch_input;
        unsigned touch_max = wacom->features.touch_max;
        int count = 0;
        int i;

        if (!touch_max)
                return 0;

        if (touch_max == 1)
                return test_bit(BTN_TOUCH, input->key) &&
                       !wacom->shared->stylus_in_proximity;

        for (i = 0; i < input->mt->num_slots; i++) {
                struct input_mt_slot *ps = &input->mt->slots[i];
                int id = input_mt_get_value(ps, ABS_MT_TRACKING_ID);
                if (id >= 0)
                        count++;
        }

        return count;
}

static int wacom_24hdt_irq(struct wacom_wac *wacom)
{
        struct input_dev *input = wacom->touch_input;
        unsigned char *data = wacom->data;
        int i;
        int current_num_contacts = data[61];
        int contacts_to_send = 0;
        int num_contacts_left = 4; /* maximum contacts per packet */
        int byte_per_packet = WACOM_BYTES_PER_24HDT_PACKET;
        int y_offset = 2;

        if (wacom->features.type == WACOM_27QHDT) {
                current_num_contacts = data[63];
                num_contacts_left = 10;
                byte_per_packet = WACOM_BYTES_PER_QHDTHID_PACKET;
                y_offset = 0;
        }

        /*
         * First packet resets the counter since only the first
         * packet in series will have non-zero current_num_contacts.
         */
        if (current_num_contacts)
                wacom->num_contacts_left = current_num_contacts;

        contacts_to_send = min(num_contacts_left, wacom->num_contacts_left);

        for (i = 0; i < contacts_to_send; i++) {
                int offset = (byte_per_packet * i) + 1;
                bool touch = (data[offset] & 0x1) && !wacom->shared->stylus_in_proximity;
                int slot = input_mt_get_slot_by_key(input, data[offset + 1]);

                if (slot < 0)
                        continue;
                input_mt_slot(input, slot);
                input_mt_report_slot_state(input, MT_TOOL_FINGER, touch);

                if (touch) {
                        int t_x = get_unaligned_le16(&data[offset + 2]);
                        int t_y = get_unaligned_le16(&data[offset + 4 + y_offset]);

                        input_report_abs(input, ABS_MT_POSITION_X, t_x);
                        input_report_abs(input, ABS_MT_POSITION_Y, t_y);

                        if (wacom->features.type != WACOM_27QHDT) {
                                int c_x = get_unaligned_le16(&data[offset + 4]);
                                int c_y = get_unaligned_le16(&data[offset + 8]);
                                int w = get_unaligned_le16(&data[offset + 10]);
                                int h = get_unaligned_le16(&data[offset + 12]);

                                input_report_abs(input, ABS_MT_TOUCH_MAJOR, min(w,h));
                                input_report_abs(input, ABS_MT_WIDTH_MAJOR,
                                                 min(w, h) + int_dist(t_x, t_y, c_x, c_y));
                                input_report_abs(input, ABS_MT_WIDTH_MINOR, min(w, h));
                                input_report_abs(input, ABS_MT_ORIENTATION, w > h);
                        }
                }
        }
        input_mt_sync_frame(input);

        wacom->num_contacts_left -= contacts_to_send;
        if (wacom->num_contacts_left <= 0) {
                wacom->num_contacts_left = 0;
                wacom->shared->touch_down = wacom_wac_finger_count_touches(wacom);
        }
        return 1;
}

static int wacom_mt_touch(struct wacom_wac *wacom)
{
        struct input_dev *input = wacom->touch_input;
        unsigned char *data = wacom->data;
        int i;
        int current_num_contacts = data[2];
        int contacts_to_send = 0;
        int x_offset = 0;

        /* MTTPC does not support Height and Width */
        if (wacom->features.type == MTTPC || wacom->features.type == MTTPC_B)
                x_offset = -4;

        /*
         * First packet resets the counter since only the first
         * packet in series will have non-zero current_num_contacts.
         */
        if (current_num_contacts)
                wacom->num_contacts_left = current_num_contacts;

        /* There are at most 5 contacts per packet */
        contacts_to_send = min(5, wacom->num_contacts_left);

        for (i = 0; i < contacts_to_send; i++) {
                int offset = (WACOM_BYTES_PER_MT_PACKET + x_offset) * i + 3;
                bool touch = (data[offset] & 0x1) && !wacom->shared->stylus_in_proximity;
                int id = get_unaligned_le16(&data[offset + 1]);
                int slot = input_mt_get_slot_by_key(input, id);

                if (slot < 0)
                        continue;

                input_mt_slot(input, slot);
                input_mt_report_slot_state(input, MT_TOOL_FINGER, touch);
                if (touch) {
                        int x = get_unaligned_le16(&data[offset + x_offset + 7]);
                        int y = get_unaligned_le16(&data[offset + x_offset + 9]);
                        input_report_abs(input, ABS_MT_POSITION_X, x);
                        input_report_abs(input, ABS_MT_POSITION_Y, y);
                }
        }
        input_mt_sync_frame(input);

        wacom->num_contacts_left -= contacts_to_send;
        if (wacom->num_contacts_left <= 0) {
                wacom->num_contacts_left = 0;
                wacom->shared->touch_down = wacom_wac_finger_count_touches(wacom);
        }
        return 1;
}

static int wacom_tpc_mt_touch(struct wacom_wac *wacom)
{
        struct input_dev *input = wacom->touch_input;
        unsigned char *data = wacom->data;
        int i;

        for (i = 0; i < 2; i++) {
                int p = data[1] & (1 << i);
                bool touch = p && !wacom->shared->stylus_in_proximity;

                input_mt_slot(input, i);
                input_mt_report_slot_state(input, MT_TOOL_FINGER, touch);
                if (touch) {
                        int x = le16_to_cpup((__le16 *)&data[i * 2 + 2]) & 0x7fff;
                        int y = le16_to_cpup((__le16 *)&data[i * 2 + 6]) & 0x7fff;

                        input_report_abs(input, ABS_MT_POSITION_X, x);
                        input_report_abs(input, ABS_MT_POSITION_Y, y);
                }
        }
        input_mt_sync_frame(input);

        /* keep touch state for pen event */
        wacom->shared->touch_down = wacom_wac_finger_count_touches(wacom);

        return 1;
}

static int wacom_tpc_single_touch(struct wacom_wac *wacom, size_t len)
{
        unsigned char *data = wacom->data;
        struct input_dev *input = wacom->touch_input;
        bool prox = !wacom->shared->stylus_in_proximity;
        int x = 0, y = 0;

        if (wacom->features.touch_max > 1 || len > WACOM_PKGLEN_TPC2FG)
                return 0;

        if (len == WACOM_PKGLEN_TPC1FG) {
                prox = prox && (data[0] & 0x01);
                x = get_unaligned_le16(&data[1]);
                y = get_unaligned_le16(&data[3]);
        } else if (len == WACOM_PKGLEN_TPC1FG_B) {
                prox = prox && (data[2] & 0x01);
                x = get_unaligned_le16(&data[3]);
                y = get_unaligned_le16(&data[5]);
        } else {
                prox = prox && (data[1] & 0x01);
                x = le16_to_cpup((__le16 *)&data[2]);
                y = le16_to_cpup((__le16 *)&data[4]);
        }

        if (prox) {
                input_report_abs(input, ABS_X, x);
                input_report_abs(input, ABS_Y, y);
        }
        input_report_key(input, BTN_TOUCH, prox);

        /* keep touch state for pen events */
        wacom->shared->touch_down = prox;

        return 1;
}

static int wacom_tpc_pen(struct wacom_wac *wacom)
{
        unsigned char *data = wacom->data;
        struct input_dev *input = wacom->pen_input;
        bool prox = data[1] & 0x20;

        if (!wacom->shared->stylus_in_proximity) /* first in prox */
                /* Going into proximity select tool */
                wacom->tool[0] = (data[1] & 0x0c) ? BTN_TOOL_RUBBER : BTN_TOOL_PEN;

        /* keep pen state for touch events */
        wacom->shared->stylus_in_proximity = prox;

        /* send pen events only when touch is up or forced out */
        if (!wacom->shared->touch_down) {
                input_report_key(input, BTN_STYLUS, data[1] & 0x02);
                input_report_key(input, BTN_STYLUS2, data[1] & 0x10);
                input_report_abs(input, ABS_X, le16_to_cpup((__le16 *)&data[2]));
                input_report_abs(input, ABS_Y, le16_to_cpup((__le16 *)&data[4]));
                input_report_abs(input, ABS_PRESSURE, ((data[7] & 0x07) << 8) | data[6]);
                input_report_key(input, BTN_TOUCH, data[1] & 0x05);
                input_report_key(input, wacom->tool[0], prox);
                return 1;
        }

        return 0;
}

static int wacom_tpc_irq(struct wacom_wac *wacom, size_t len)
{
        unsigned char *data = wacom->data;

        if (wacom->pen_input)
                dev_dbg(wacom->pen_input->dev.parent,
                        "%s: received report #%d\n", __func__, data[0]);
        else if (wacom->touch_input)
                dev_dbg(wacom->touch_input->dev.parent,
                        "%s: received report #%d\n", __func__, data[0]);

        switch (len) {
        case WACOM_PKGLEN_TPC1FG:
                return wacom_tpc_single_touch(wacom, len);

        case WACOM_PKGLEN_TPC2FG:
                return wacom_tpc_mt_touch(wacom);

        case WACOM_PKGLEN_PENABLED:
                return wacom_tpc_pen(wacom);

        default:
                switch (data[0]) {
                case WACOM_REPORT_TPC1FG:
                case WACOM_REPORT_TPCHID:
                case WACOM_REPORT_TPCST:
                case WACOM_REPORT_TPC1FGE:
                        return wacom_tpc_single_touch(wacom, len);

                case WACOM_REPORT_TPCMT:
                case WACOM_REPORT_TPCMT2:
                        return wacom_mt_touch(wacom);

                case WACOM_REPORT_PENABLED:
                        return wacom_tpc_pen(wacom);
                }
        }

        return 0;
}

static void wacom_map_usage(struct input_dev *input, struct hid_usage *usage,
                struct hid_field *field, __u8 type, __u16 code, int fuzz)
{
        int fmin = field->logical_minimum;
        int fmax = field->logical_maximum;

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

        set_bit(type, input->evbit);

        switch (type) {
        case EV_ABS:
                input_set_abs_params(input, code, fmin, fmax, fuzz, 0);
                input_abs_set_res(input, code,
                                  hidinput_calc_abs_res(field, code));
                break;
        case EV_KEY:
                input_set_capability(input, EV_KEY, code);
                break;
        case EV_MSC:
                input_set_capability(input, EV_MSC, code);
                break;
        }
}

static void wacom_wac_pen_usage_mapping(struct hid_device *hdev,
                struct hid_field *field, struct hid_usage *usage)
{
        struct wacom *wacom = hid_get_drvdata(hdev);
        struct wacom_wac *wacom_wac = &wacom->wacom_wac;
        struct input_dev *input = wacom_wac->pen_input;

        switch (usage->hid) {
        case HID_GD_X:
                wacom_map_usage(input, usage, field, EV_ABS, ABS_X, 4);
                break;
        case HID_GD_Y:
                wacom_map_usage(input, usage, field, EV_ABS, ABS_Y, 4);
                break;
        case HID_DG_TIPPRESSURE:
                wacom_map_usage(input, usage, field, EV_ABS, ABS_PRESSURE, 0);
                break;
        case HID_DG_INRANGE:
                wacom_map_usage(input, usage, field, EV_KEY, BTN_TOOL_PEN, 0);
                break;
        case HID_DG_INVERT:
                wacom_map_usage(input, usage, field, EV_KEY,
                                BTN_TOOL_RUBBER, 0);
                break;
        case HID_DG_ERASER:
        case HID_DG_TIPSWITCH:
                wacom_map_usage(input, usage, field, EV_KEY, BTN_TOUCH, 0);
                break;
        case HID_DG_BARRELSWITCH:
                wacom_map_usage(input, usage, field, EV_KEY, BTN_STYLUS, 0);
                break;
        case HID_DG_BARRELSWITCH2:
                wacom_map_usage(input, usage, field, EV_KEY, BTN_STYLUS2, 0);
                break;
        case HID_DG_TOOLSERIALNUMBER:
                wacom_map_usage(input, usage, field, EV_MSC, MSC_SERIAL, 0);
                break;
        }
}

static int wacom_wac_pen_event(struct hid_device *hdev, struct hid_field *field,
                struct hid_usage *usage, __s32 value)
{
        struct wacom *wacom = hid_get_drvdata(hdev);
        struct wacom_wac *wacom_wac = &wacom->wacom_wac;
        struct input_dev *input = wacom_wac->pen_input;

        /* checking which Tool / tip switch to send */
        switch (usage->hid) {
        case HID_DG_INRANGE:
                wacom_wac->hid_data.inrange_state = value;
                return 0;
        case HID_DG_INVERT:
                wacom_wac->hid_data.invert_state = value;
                return 0;
        case HID_DG_ERASER:
        case HID_DG_TIPSWITCH:
                wacom_wac->hid_data.tipswitch |= value;
                return 0;
        }

        /* send pen events only when touch is up or forced out */
        if (!usage->type || wacom_wac->shared->touch_down)
                return 0;

        input_event(input, usage->type, usage->code, value);

        return 0;
}

static void wacom_wac_pen_pre_report(struct hid_device *hdev,
                struct hid_report *report)
{
        return;
}

static void wacom_wac_pen_report(struct hid_device *hdev,
                struct hid_report *report)
{
        struct wacom *wacom = hid_get_drvdata(hdev);
        struct wacom_wac *wacom_wac = &wacom->wacom_wac;
        struct input_dev *input = wacom_wac->pen_input;
        bool prox = wacom_wac->hid_data.inrange_state;

        if (!wacom_wac->shared->stylus_in_proximity) /* first in prox */
                /* Going into proximity select tool */
                wacom_wac->tool[0] = wacom_wac->hid_data.invert_state ?
                                                BTN_TOOL_RUBBER : BTN_TOOL_PEN;

        /* keep pen state for touch events */
        wacom_wac->shared->stylus_in_proximity = prox;

        /* send pen events only when touch is up or forced out */
        if (!wacom_wac->shared->touch_down) {
                input_report_key(input, BTN_TOUCH,
                                wacom_wac->hid_data.tipswitch);
                input_report_key(input, wacom_wac->tool[0], prox);

                wacom_wac->hid_data.tipswitch = false;

                input_sync(input);
        }
}

static void wacom_wac_finger_usage_mapping(struct hid_device *hdev,
                struct hid_field *field, struct hid_usage *usage)
{
        struct wacom *wacom = hid_get_drvdata(hdev);
        struct wacom_wac *wacom_wac = &wacom->wacom_wac;
        struct wacom_features *features = &wacom_wac->features;
        struct input_dev *input = wacom_wac->touch_input;
        unsigned touch_max = wacom_wac->features.touch_max;

        switch (usage->hid) {
        case HID_GD_X:
                features->last_slot_field = usage->hid;
                if (touch_max == 1)
                        wacom_map_usage(input, usage, field, EV_ABS, ABS_X, 4);
                else
                        wacom_map_usage(input, usage, field, EV_ABS,
                                        ABS_MT_POSITION_X, 4);
                break;
        case HID_GD_Y:
                features->last_slot_field = usage->hid;
                if (touch_max == 1)
                        wacom_map_usage(input, usage, field, EV_ABS, ABS_Y, 4);
                else
                        wacom_map_usage(input, usage, field, EV_ABS,
                                        ABS_MT_POSITION_Y, 4);
                break;
        case HID_DG_WIDTH:
        case HID_DG_HEIGHT:
                features->last_slot_field = usage->hid;
                wacom_map_usage(input, usage, field, EV_ABS, ABS_MT_TOUCH_MAJOR, 0);
                wacom_map_usage(input, usage, field, EV_ABS, ABS_MT_TOUCH_MINOR, 0);
                input_set_abs_params(input, ABS_MT_ORIENTATION, 0, 1, 0, 0);
                break;
        case HID_DG_CONTACTID:
                features->last_slot_field = usage->hid;
                break;
        case HID_DG_INRANGE:
                features->last_slot_field = usage->hid;
                break;
        case HID_DG_INVERT:
                features->last_slot_field = usage->hid;
                break;
        case HID_DG_TIPSWITCH:
                features->last_slot_field = usage->hid;
                wacom_map_usage(input, usage, field, EV_KEY, BTN_TOUCH, 0);
                break;
        case HID_DG_CONTACTCOUNT:
                wacom_wac->hid_data.cc_report = field->report->id;
                wacom_wac->hid_data.cc_index = field->index;
                wacom_wac->hid_data.cc_value_index = usage->usage_index;
                break;
        }
}

static void wacom_wac_finger_slot(struct wacom_wac *wacom_wac,
                struct input_dev *input)
{
        struct hid_data *hid_data = &wacom_wac->hid_data;
        bool mt = wacom_wac->features.touch_max > 1;
        bool prox = hid_data->tipswitch &&
                    !wacom_wac->shared->stylus_in_proximity;

        wacom_wac->hid_data.num_received++;
        if (wacom_wac->hid_data.num_received > wacom_wac->hid_data.num_expected)
                return;

        if (mt) {
                int slot;

                slot = input_mt_get_slot_by_key(input, hid_data->id);
                input_mt_slot(input, slot);
                input_mt_report_slot_state(input, MT_TOOL_FINGER, prox);
        }
        else {
                input_report_key(input, BTN_TOUCH, prox);
        }

        if (prox) {
                input_report_abs(input, mt ? ABS_MT_POSITION_X : ABS_X,
                                 hid_data->x);
                input_report_abs(input, mt ? ABS_MT_POSITION_Y : ABS_Y,
                                 hid_data->y);

                if (test_bit(ABS_MT_TOUCH_MAJOR, input->absbit)) {
                        input_report_abs(input, ABS_MT_TOUCH_MAJOR, max(hid_data->width, hid_data->height));
                        input_report_abs(input, ABS_MT_TOUCH_MINOR, min(hid_data->width, hid_data->height));
                        if (hid_data->width != hid_data->height)
                                input_report_abs(input, ABS_MT_ORIENTATION, hid_data->width <= hid_data->height ? 0 : 1);
                }
        }
}

static int wacom_wac_finger_event(struct hid_device *hdev,
                struct hid_field *field, struct hid_usage *usage, __s32 value)
{
        struct wacom *wacom = hid_get_drvdata(hdev);
        struct wacom_wac *wacom_wac = &wacom->wacom_wac;

        switch (usage->hid) {
        case HID_GD_X:
                wacom_wac->hid_data.x = value;
                break;
        case HID_GD_Y:
                wacom_wac->hid_data.y = value;
                break;
        case HID_DG_WIDTH:
                wacom_wac->hid_data.width = value;
                break;
        case HID_DG_HEIGHT:
                wacom_wac->hid_data.height = value;
                break;
        case HID_DG_CONTACTID:
                wacom_wac->hid_data.id = value;
                break;
        case HID_DG_TIPSWITCH:
                wacom_wac->hid_data.tipswitch = value;
                break;
        }


        if (usage->usage_index + 1 == field->report_count) {
                if (usage->hid == wacom_wac->features.last_slot_field)
                        wacom_wac_finger_slot(wacom_wac, wacom_wac->touch_input);
        }

        return 0;
}

static void wacom_wac_finger_pre_report(struct hid_device *hdev,
                struct hid_report *report)
{
        struct wacom *wacom = hid_get_drvdata(hdev);
        struct wacom_wac *wacom_wac = &wacom->wacom_wac;
        struct hid_data* hid_data = &wacom_wac->hid_data;

        if (hid_data->cc_report != 0 &&
            hid_data->cc_report != report->id) {
                int i;

                hid_data->cc_report = report->id;
                hid_data->cc_index = -1;
                hid_data->cc_value_index = -1;

                for (i = 0; i < report->maxfield; i++) {
                        struct hid_field *field = report->field[i];
                        int j;

                        for (j = 0; j < field->maxusage; j++) {
                                if (field->usage[j].hid == HID_DG_CONTACTCOUNT) {
                                        hid_data->cc_index = i;
                                        hid_data->cc_value_index = j;

                                        /* break */
                                        i = report->maxfield;
                                        j = field->maxusage;
                                }
                        }
                }
        }
        if (hid_data->cc_report != 0 &&
            hid_data->cc_index >= 0) {
                struct hid_field *field = report->field[hid_data->cc_index];
                int value = field->value[hid_data->cc_value_index];
                if (value)
                        hid_data->num_expected = value;
        }
        else {
                hid_data->num_expected = wacom_wac->features.touch_max;
        }
}

static void wacom_wac_finger_report(struct hid_device *hdev,
                struct hid_report *report)
{
        struct wacom *wacom = hid_get_drvdata(hdev);
        struct wacom_wac *wacom_wac = &wacom->wacom_wac;
        struct input_dev *input = wacom_wac->touch_input;
        unsigned touch_max = wacom_wac->features.touch_max;

        /* If more packets of data are expected, give us a chance to
         * process them rather than immediately syncing a partial
         * update.
         */
        if (wacom_wac->hid_data.num_received < wacom_wac->hid_data.num_expected)
                return;

        if (touch_max > 1)
                input_mt_sync_frame(input);

        input_sync(input);
        wacom_wac->hid_data.num_received = 0;

        /* keep touch state for pen event */
        wacom_wac->shared->touch_down = wacom_wac_finger_count_touches(wacom_wac);
}

void wacom_wac_usage_mapping(struct hid_device *hdev,
                struct hid_field *field, struct hid_usage *usage)
{
        struct wacom *wacom = hid_get_drvdata(hdev);
        struct wacom_wac *wacom_wac = &wacom->wacom_wac;

        /* currently, only direct devices have proper hid report descriptors */
        __set_bit(INPUT_PROP_DIRECT, wacom_wac->pen_input->propbit);
        __set_bit(INPUT_PROP_DIRECT, wacom_wac->touch_input->propbit);

        if (WACOM_PEN_FIELD(field))
                return wacom_wac_pen_usage_mapping(hdev, field, usage);

        if (WACOM_FINGER_FIELD(field))
                return wacom_wac_finger_usage_mapping(hdev, field, usage);
}

int wacom_wac_event(struct hid_device *hdev, struct hid_field *field,
                struct hid_usage *usage, __s32 value)
{
        struct wacom *wacom = hid_get_drvdata(hdev);

        if (wacom->wacom_wac.features.type != HID_GENERIC)
                return 0;

        if (WACOM_PEN_FIELD(field))
                return wacom_wac_pen_event(hdev, field, usage, value);

        if (WACOM_FINGER_FIELD(field))
                return wacom_wac_finger_event(hdev, field, usage, value);

        return 0;
}

static void wacom_report_events(struct hid_device *hdev, struct hid_report *report)
{
        int r;

        for (r = 0; r < report->maxfield; r++) {
                struct hid_field *field;
                unsigned count, n;

                field = report->field[r];
                count = field->report_count;

                if (!(HID_MAIN_ITEM_VARIABLE & field->flags))
                        continue;

                for (n = 0; n < count; n++)
                        wacom_wac_event(hdev, field, &field->usage[n], field->value[n]);
        }
}

void wacom_wac_report(struct hid_device *hdev, struct hid_report *report)
{
        struct wacom *wacom = hid_get_drvdata(hdev);
        struct wacom_wac *wacom_wac = &wacom->wacom_wac;
        struct hid_field *field = report->field[0];

        if (wacom_wac->features.type != HID_GENERIC)
                return;

        if (WACOM_PEN_FIELD(field))
                wacom_wac_pen_pre_report(hdev, report);

        if (WACOM_FINGER_FIELD(field))
                wacom_wac_finger_pre_report(hdev, report);

        wacom_report_events(hdev, report);

        if (WACOM_PEN_FIELD(field))
                return wacom_wac_pen_report(hdev, report);

        if (WACOM_FINGER_FIELD(field))
                return wacom_wac_finger_report(hdev, report);
}

static int wacom_bpt_touch(struct wacom_wac *wacom)
{
        struct wacom_features *features = &wacom->features;
        struct input_dev *input = wacom->touch_input;
        struct input_dev *pad_input = wacom->pad_input;
        unsigned char *data = wacom->data;
        int i;

        if (data[0] != 0x02)
            return 0;

        for (i = 0; i < 2; i++) {
                int offset = (data[1] & 0x80) ? (8 * i) : (9 * i);
                bool touch = data[offset + 3] & 0x80;

                /*
                 * Touch events need to be disabled while stylus is
                 * in proximity because user's hand is resting on touchpad
                 * and sending unwanted events.  User expects tablet buttons
                 * to continue working though.
                 */
                touch = touch && !wacom->shared->stylus_in_proximity;

                input_mt_slot(input, i);
                input_mt_report_slot_state(input, MT_TOOL_FINGER, touch);
                if (touch) {
                        int x = get_unaligned_be16(&data[offset + 3]) & 0x7ff;
                        int y = get_unaligned_be16(&data[offset + 5]) & 0x7ff;
                        if (features->quirks & WACOM_QUIRK_BBTOUCH_LOWRES) {
                                x <<= 5;
                                y <<= 5;
                        }
                        input_report_abs(input, ABS_MT_POSITION_X, x);
                        input_report_abs(input, ABS_MT_POSITION_Y, y);
                }
        }

        input_mt_sync_frame(input);

        input_report_key(pad_input, BTN_LEFT, (data[1] & 0x08) != 0);
        input_report_key(pad_input, BTN_FORWARD, (data[1] & 0x04) != 0);
        input_report_key(pad_input, BTN_BACK, (data[1] & 0x02) != 0);
        input_report_key(pad_input, BTN_RIGHT, (data[1] & 0x01) != 0);
        wacom->shared->touch_down = wacom_wac_finger_count_touches(wacom);

        return 1;
}

static void wacom_bpt3_touch_msg(struct wacom_wac *wacom, unsigned char *data)
{
        struct wacom_features *features = &wacom->features;
        struct input_dev *input = wacom->touch_input;
        bool touch = data[1] & 0x80;
        int slot = input_mt_get_slot_by_key(input, data[0]);

        if (slot < 0)
                return;

        touch = touch && !wacom->shared->stylus_in_proximity;

        input_mt_slot(input, slot);
        input_mt_report_slot_state(input, MT_TOOL_FINGER, touch);

        if (touch) {
                int x = (data[2] << 4) | (data[4] >> 4);
                int y = (data[3] << 4) | (data[4] & 0x0f);
                int width, height;

                if (features->type >= INTUOSPS && features->type <= INTUOSHT2) {
                        width  = data[5] * 100;
                        height = data[6] * 100;
                } else {
                        /*
                         * "a" is a scaled-down area which we assume is
                         * roughly circular and which can be described as:
                         * a=(pi*r^2)/C.
                         */
                        int a = data[5];
                        int x_res = input_abs_get_res(input, ABS_MT_POSITION_X);
                        int y_res = input_abs_get_res(input, ABS_MT_POSITION_Y);
                        width = 2 * int_sqrt(a * WACOM_CONTACT_AREA_SCALE);
                        height = width * y_res / x_res;
                }

                input_report_abs(input, ABS_MT_POSITION_X, x);
                input_report_abs(input, ABS_MT_POSITION_Y, y);
                input_report_abs(input, ABS_MT_TOUCH_MAJOR, width);
                input_report_abs(input, ABS_MT_TOUCH_MINOR, height);
        }
}

static void wacom_bpt3_button_msg(struct wacom_wac *wacom, unsigned char *data)
{
        struct input_dev *input = wacom->pad_input;
        struct wacom_features *features = &wacom->features;

        if (features->type == INTUOSHT || features->type == INTUOSHT2) {
                input_report_key(input, BTN_LEFT, (data[1] & 0x02) != 0);
                input_report_key(input, BTN_BACK, (data[1] & 0x08) != 0);
        } else {
                input_report_key(input, BTN_BACK, (data[1] & 0x02) != 0);
                input_report_key(input, BTN_LEFT, (data[1] & 0x08) != 0);
        }
        input_report_key(input, BTN_FORWARD, (data[1] & 0x04) != 0);
        input_report_key(input, BTN_RIGHT, (data[1] & 0x01) != 0);
}

static int wacom_bpt3_touch(struct wacom_wac *wacom)
{
        unsigned char *data = wacom->data;
        int count = data[1] & 0x07;
        int  touch_changed = 0, i;

        if (data[0] != 0x02)
            return 0;

        /* data has up to 7 fixed sized 8-byte messages starting at data[2] */
        for (i = 0; i < count; i++) {
                int offset = (8 * i) + 2;
                int msg_id = data[offset];

                if (msg_id >= 2 && msg_id <= 17) {
                        wacom_bpt3_touch_msg(wacom, data + offset);
                        touch_changed++;
                } else if (msg_id == 128)
                        wacom_bpt3_button_msg(wacom, data + offset);

        }

        /* only update touch if we actually have a touchpad and touch data changed */
        if (wacom->touch_registered && touch_changed) {
                input_mt_sync_frame(wacom->touch_input);
                wacom->shared->touch_down = wacom_wac_finger_count_touches(wacom);
        }

        return 1;
}

static int wacom_bpt_pen(struct wacom_wac *wacom)
{
        struct wacom_features *features = &wacom->features;
        struct input_dev *input = wacom->pen_input;
        unsigned char *data = wacom->data;
        int prox = 0, x = 0, y = 0, p = 0, d = 0, pen = 0, btn1 = 0, btn2 = 0;

        if (data[0] != WACOM_REPORT_PENABLED)
            return 0;

        prox = (data[1] & 0x20) == 0x20;

        /*
         * All reports shared between PEN and RUBBER tool must be
         * forced to a known starting value (zero) when transitioning to
         * out-of-prox.
         *
         * If not reset then, to userspace, it will look like lost events
         * if new tool comes in-prox with same values as previous tool sent.
         *
         * Hardware does report zero in most out-of-prox cases but not all.
         */
        if (!wacom->shared->stylus_in_proximity) {
                if (data[1] & 0x08) {
                        wacom->tool[0] = BTN_TOOL_RUBBER;
                        wacom->id[0] = ERASER_DEVICE_ID;
                } else {
                        wacom->tool[0] = BTN_TOOL_PEN;
                        wacom->id[0] = STYLUS_DEVICE_ID;
                }
        }

        wacom->shared->stylus_in_proximity = prox;
        if (wacom->shared->touch_down)
                return 0;

        if (prox) {
                x = le16_to_cpup((__le16 *)&data[2]);
                y = le16_to_cpup((__le16 *)&data[4]);
                p = le16_to_cpup((__le16 *)&data[6]);
                /*
                 * Convert distance from out prox to distance from tablet.
                 * distance will be greater than distance_max once
                 * touching and applying pressure; do not report negative
                 * distance.
                 */
                if (data[8] <= features->distance_max)
                        d = features->distance_max - data[8];

                pen = data[1] & 0x01;
                btn1 = data[1] & 0x02;
                btn2 = data[1] & 0x04;
        } else {
                wacom->id[0] = 0;
        }

        input_report_key(input, BTN_TOUCH, pen);
        input_report_key(input, BTN_STYLUS, btn1);
        input_report_key(input, BTN_STYLUS2, btn2);

        input_report_abs(input, ABS_X, x);
        input_report_abs(input, ABS_Y, y);
        input_report_abs(input, ABS_PRESSURE, p);
        input_report_abs(input, ABS_DISTANCE, d);

        input_report_key(input, wacom->tool[0], prox); /* PEN or RUBBER */
        input_report_abs(input, ABS_MISC, wacom->id[0]); /* TOOL ID */

        return 1;
}

static int wacom_bpt_irq(struct wacom_wac *wacom, size_t len)
{
        struct wacom_features *features = &wacom->features;

        if ((features->type == INTUOSHT2) &&
            (features->device_type & WACOM_DEVICETYPE_PEN))
                return wacom_intuos_irq(wacom);
        else if (len == WACOM_PKGLEN_BBTOUCH)
                return wacom_bpt_touch(wacom);
        else if (len == WACOM_PKGLEN_BBTOUCH3)
                return wacom_bpt3_touch(wacom);
        else if (len == WACOM_PKGLEN_BBFUN || len == WACOM_PKGLEN_BBPEN)
                return wacom_bpt_pen(wacom);

        return 0;
}

static void wacom_bamboo_pad_pen_event(struct wacom_wac *wacom,
                unsigned char *data)
{
        unsigned char prefix;

        /*
         * We need to reroute the event from the debug interface to the
         * pen interface.
         * We need to add the report ID to the actual pen report, so we
         * temporary overwrite the first byte to prevent having to kzalloc/kfree
         * and memcpy the report.
         */
        prefix = data[0];
        data[0] = WACOM_REPORT_BPAD_PEN;

        /*
         * actually reroute the event.
         * No need to check if wacom->shared->pen is valid, hid_input_report()
         * will check for us.
         */
        hid_input_report(wacom->shared->pen, HID_INPUT_REPORT, data,
                         WACOM_PKGLEN_PENABLED, 1);

        data[0] = prefix;
}

static int wacom_bamboo_pad_touch_event(struct wacom_wac *wacom,
                unsigned char *data)
{
        struct input_dev *input = wacom->touch_input;
        unsigned char *finger_data, prefix;
        unsigned id;
        int x, y;
        bool valid;

        prefix = data[0];

        for (id = 0; id < wacom->features.touch_max; id++) {
                valid = !!(prefix & BIT(id)) &&
                        !wacom->shared->stylus_in_proximity;

                input_mt_slot(input, id);
                input_mt_report_slot_state(input, MT_TOOL_FINGER, valid);

                if (!valid)
                        continue;

                finger_data = data + 1 + id * 3;
                x = finger_data[0] | ((finger_data[1] & 0x0f) << 8);
                y = (finger_data[2] << 4) | (finger_data[1] >> 4);

                input_report_abs(input, ABS_MT_POSITION_X, x);
                input_report_abs(input, ABS_MT_POSITION_Y, y);
        }

        input_mt_sync_frame(input);

        input_report_key(input, BTN_LEFT, prefix & 0x40);
        input_report_key(input, BTN_RIGHT, prefix & 0x80);

        /* keep touch state for pen event */
        wacom->shared->touch_down = !!prefix &&
                                    !wacom->shared->stylus_in_proximity;

        return 1;
}

static int wacom_bamboo_pad_irq(struct wacom_wac *wacom, size_t len)
{
        unsigned char *data = wacom->data;

        if (!((len == WACOM_PKGLEN_BPAD_TOUCH) ||
              (len == WACOM_PKGLEN_BPAD_TOUCH_USB)) ||
            (data[0] != WACOM_REPORT_BPAD_TOUCH))
                return 0;

        if (data[1] & 0x01)
                wacom_bamboo_pad_pen_event(wacom, &data[1]);

        if (data[1] & 0x02)
                return wacom_bamboo_pad_touch_event(wacom, &data[9]);

        return 0;
}

static int wacom_wireless_irq(struct wacom_wac *wacom, size_t len)
{
        unsigned char *data = wacom->data;
        int connected;

        if (len != WACOM_PKGLEN_WIRELESS || data[0] != WACOM_REPORT_WL)
                return 0;

        connected = data[1] & 0x01;
        if (connected) {
                int pid, battery, charging;

                if ((wacom->shared->type == INTUOSHT ||
                    wacom->shared->type == INTUOSHT2) &&
                    wacom->shared->touch_input &&
                    wacom->shared->touch_max) {
                        input_report_switch(wacom->shared->touch_input,
                                        SW_MUTE_DEVICE, data[5] & 0x40);
                        input_sync(wacom->shared->touch_input);
                }

                pid = get_unaligned_be16(&data[6]);
                battery = (data[5] & 0x3f) * 100 / 31;
                charging = !!(data[5] & 0x80);
                if (wacom->pid != pid) {
                        wacom->pid = pid;
                        wacom_schedule_work(wacom);
                }

                if (wacom->shared->type)
                        wacom_notify_battery(wacom, battery, charging, 1, 0);

        } else if (wacom->pid != 0) {
                /* disconnected while previously connected */
                wacom->pid = 0;
                wacom_schedule_work(wacom);
                wacom_notify_battery(wacom, 0, 0, 0, 0);
        }

        return 0;
}

static int wacom_status_irq(struct wacom_wac *wacom_wac, size_t len)
{
        struct wacom *wacom = container_of(wacom_wac, struct wacom, wacom_wac);
        struct wacom_features *features = &wacom_wac->features;
        unsigned char *data = wacom_wac->data;

        if (data[0] != WACOM_REPORT_USB)
                return 0;

        if ((features->type == INTUOSHT ||
            features->type == INTUOSHT2) &&
            wacom_wac->shared->touch_input &&
            features->touch_max) {
                input_report_switch(wacom_wac->shared->touch_input,
                                    SW_MUTE_DEVICE, data[8] & 0x40);
                input_sync(wacom_wac->shared->touch_input);
        }

        if (data[9] & 0x02) { /* wireless module is attached */
                int battery = (data[8] & 0x3f) * 100 / 31;
                bool charging = !!(data[8] & 0x80);

                wacom_notify_battery(wacom_wac, battery, charging,
                                     battery || charging, 1);

                if (!wacom->battery &&
                    !(features->quirks & WACOM_QUIRK_BATTERY)) {
                        features->quirks |= WACOM_QUIRK_BATTERY;
                        INIT_WORK(&wacom->work, wacom_battery_work);
                        wacom_schedule_work(wacom_wac);
                }
        }
        else if ((features->quirks & WACOM_QUIRK_BATTERY) &&
                 wacom->battery) {
                features->quirks &= ~WACOM_QUIRK_BATTERY;
                INIT_WORK(&wacom->work, wacom_battery_work);
                wacom_schedule_work(wacom_wac);
                wacom_notify_battery(wacom_wac, 0, 0, 0, 0);
        }
        return 0;
}

void wacom_wac_irq(struct wacom_wac *wacom_wac, size_t len)
{
        bool sync;

        switch (wacom_wac->features.type) {
        case PENPARTNER:
                sync = wacom_penpartner_irq(wacom_wac);
                break;

        case PL:
                sync = wacom_pl_irq(wacom_wac);
                break;

        case WACOM_G4:
        case GRAPHIRE:
        case GRAPHIRE_BT:
        case WACOM_MO:
                sync = wacom_graphire_irq(wacom_wac);
                break;

        case PTU:
                sync = wacom_ptu_irq(wacom_wac);
                break;

        case DTU:
                sync = wacom_dtu_irq(wacom_wac);
                break;

        case DTUS:
        case DTUSX:
                sync = wacom_dtus_irq(wacom_wac);
                break;

        case INTUOS:
        case INTUOS3S:
        case INTUOS3:
        case INTUOS3L:
        case INTUOS4S:
        case INTUOS4:
        case INTUOS4L:
        case CINTIQ:
        case WACOM_BEE:
        case WACOM_13HD:
        case WACOM_21UX2:
        case WACOM_22HD:
        case WACOM_24HD:
        case WACOM_27QHD:
        case DTK:
        case CINTIQ_HYBRID:
        case CINTIQ_COMPANION_2:
                sync = wacom_intuos_irq(wacom_wac);
                break;

        case INTUOS4WL:
                sync = wacom_intuos_bt_irq(wacom_wac, len);
                break;

        case WACOM_24HDT:
        case WACOM_27QHDT:
                sync = wacom_24hdt_irq(wacom_wac);
                break;

        case INTUOS5S:
        case INTUOS5:
        case INTUOS5L:
        case INTUOSPS:
        case INTUOSPM:
        case INTUOSPL:
                if (len == WACOM_PKGLEN_BBTOUCH3)
                        sync = wacom_bpt3_touch(wacom_wac);
                else if (wacom_wac->data[0] == WACOM_REPORT_USB)
                        sync = wacom_status_irq(wacom_wac, len);
                else
                        sync = wacom_intuos_irq(wacom_wac);
                break;

        case TABLETPC:
        case TABLETPCE:
        case TABLETPC2FG:
        case MTSCREEN:
        case MTTPC:
        case MTTPC_B:
                sync = wacom_tpc_irq(wacom_wac, len);
                break;

        case BAMBOO_PT:
        case BAMBOO_PEN:
        case BAMBOO_TOUCH:
        case INTUOSHT:
        case INTUOSHT2:
                if (wacom_wac->data[0] == WACOM_REPORT_USB)
                        sync = wacom_status_irq(wacom_wac, len);
                else
                        sync = wacom_bpt_irq(wacom_wac, len);
                break;

        case BAMBOO_PAD:
                sync = wacom_bamboo_pad_irq(wacom_wac, len);
                break;

        case WIRELESS:
                sync = wacom_wireless_irq(wacom_wac, len);
                break;

        case REMOTE:
                if (wacom_wac->data[0] == WACOM_REPORT_DEVICE_LIST)
                        sync = wacom_remote_status_irq(wacom_wac, len);
                else
                        sync = wacom_remote_irq(wacom_wac, len);
                break;

        default:
                sync = false;
                break;
        }

        if (sync) {
                if (wacom_wac->pen_input)
                        input_sync(wacom_wac->pen_input);
                if (wacom_wac->touch_input)
                        input_sync(wacom_wac->touch_input);
                if (wacom_wac->pad_input)
                        input_sync(wacom_wac->pad_input);
        }
}

static void wacom_setup_basic_pro_pen(struct wacom_wac *wacom_wac)
{
        struct input_dev *input_dev = wacom_wac->pen_input;

        input_set_capability(input_dev, EV_MSC, MSC_SERIAL);

        __set_bit(BTN_TOOL_PEN, input_dev->keybit);
        __set_bit(BTN_STYLUS, input_dev->keybit);
        __set_bit(BTN_STYLUS2, input_dev->keybit);

        input_set_abs_params(input_dev, ABS_DISTANCE,
                             0, wacom_wac->features.distance_max, wacom_wac->features.distance_fuzz, 0);
}

static void wacom_setup_cintiq(struct wacom_wac *wacom_wac)
{
        struct input_dev *input_dev = wacom_wac->pen_input;
        struct wacom_features *features = &wacom_wac->features;

        wacom_setup_basic_pro_pen(wacom_wac);

        __set_bit(BTN_TOOL_RUBBER, input_dev->keybit);
        __set_bit(BTN_TOOL_BRUSH, input_dev->keybit);
        __set_bit(BTN_TOOL_PENCIL, input_dev->keybit);
        __set_bit(BTN_TOOL_AIRBRUSH, input_dev->keybit);

        input_set_abs_params(input_dev, ABS_WHEEL, 0, 1023, 0, 0);
        input_set_abs_params(input_dev, ABS_TILT_X, -64, 63, features->tilt_fuzz, 0);
        input_abs_set_res(input_dev, ABS_TILT_X, 57);
        input_set_abs_params(input_dev, ABS_TILT_Y, -64, 63, features->tilt_fuzz, 0);
        input_abs_set_res(input_dev, ABS_TILT_Y, 57);
}

static void wacom_setup_intuos(struct wacom_wac *wacom_wac)
{
        struct input_dev *input_dev = wacom_wac->pen_input;

        input_set_capability(input_dev, EV_REL, REL_WHEEL);

        wacom_setup_cintiq(wacom_wac);

        __set_bit(BTN_LEFT, input_dev->keybit);
        __set_bit(BTN_RIGHT, input_dev->keybit);
        __set_bit(BTN_MIDDLE, input_dev->keybit);
        __set_bit(BTN_SIDE, input_dev->keybit);
        __set_bit(BTN_EXTRA, input_dev->keybit);
        __set_bit(BTN_TOOL_MOUSE, input_dev->keybit);
        __set_bit(BTN_TOOL_LENS, input_dev->keybit);

        input_set_abs_params(input_dev, ABS_RZ, -900, 899, 0, 0);
        input_abs_set_res(input_dev, ABS_RZ, 287);
        input_set_abs_params(input_dev, ABS_THROTTLE, -1023, 1023, 0, 0);
}

void wacom_setup_device_quirks(struct wacom *wacom)
{
        struct wacom_features *features = &wacom->wacom_wac.features;

        /* The pen and pad share the same interface on most devices */
        if (features->type == GRAPHIRE_BT || features->type == WACOM_G4 ||
            features->type == DTUS ||
            (features->type >= INTUOS3S && features->type <= WACOM_MO)) {
                if (features->device_type & WACOM_DEVICETYPE_PEN)
                        features->device_type |= WACOM_DEVICETYPE_PAD;
        }

        /* touch device found but size is not defined. use default */
        if (features->device_type & WACOM_DEVICETYPE_TOUCH && !features->x_max) {
                features->x_max = 1023;
                features->y_max = 1023;
        }

        /*
         * Intuos5/Pro and Bamboo 3rd gen have no useful data about its
         * touch interface in its HID descriptor. If this is the touch
         * interface (PacketSize of WACOM_PKGLEN_BBTOUCH3), override the
         * tablet values.
         */
        if ((features->type >= INTUOS5S && features->type <= INTUOSPL) ||
                (features->type >= INTUOSHT && features->type <= BAMBOO_PT)) {
                if (features->pktlen == WACOM_PKGLEN_BBTOUCH3) {
                        if (features->touch_max)
                                features->device_type |= WACOM_DEVICETYPE_TOUCH;
                        if (features->type >= INTUOSHT && features->type <= BAMBOO_PT)
                                features->device_type |= WACOM_DEVICETYPE_PAD;

                        features->x_max = 4096;
                        features->y_max = 4096;
                }
                else if (features->pktlen == WACOM_PKGLEN_BBTOUCH) {
                        features->device_type |= WACOM_DEVICETYPE_PAD;
                }
        }

        /*
         * Hack for the Bamboo One:
         * the device presents a PAD/Touch interface as most Bamboos and even
         * sends ghosts PAD data on it. However, later, we must disable this
         * ghost interface, and we can not detect it unless we set it here
         * to WACOM_DEVICETYPE_PAD or WACOM_DEVICETYPE_TOUCH.
         */
        if (features->type == BAMBOO_PEN &&
            features->pktlen == WACOM_PKGLEN_BBTOUCH3)
                features->device_type |= WACOM_DEVICETYPE_PAD;

        /*
         * Raw Wacom-mode pen and touch events both come from interface
         * 0, whose HID descriptor has an application usage of 0xFF0D
         * (i.e., WACOM_VENDORDEFINED_PEN). We route pen packets back
         * out through the HID_GENERIC device created for interface 1,
         * so rewrite this one to be of type WACOM_DEVICETYPE_TOUCH.
         */
        if (features->type == BAMBOO_PAD)
                features->device_type = WACOM_DEVICETYPE_TOUCH;

        if (features->type == REMOTE)
                features->device_type = WACOM_DEVICETYPE_PAD;

        if (wacom->hdev->bus == BUS_BLUETOOTH)
                features->quirks |= WACOM_QUIRK_BATTERY;

        /* quirk for bamboo touch with 2 low res touches */
        if ((features->type == BAMBOO_PT || features->type == BAMBOO_TOUCH) &&
            features->pktlen == WACOM_PKGLEN_BBTOUCH) {
                features->x_max <<= 5;
                features->y_max <<= 5;
                features->x_fuzz <<= 5;
                features->y_fuzz <<= 5;
                features->quirks |= WACOM_QUIRK_BBTOUCH_LOWRES;
        }

        if (features->type == WIRELESS) {
                if (features->device_type == WACOM_DEVICETYPE_WL_MONITOR) {
                        features->quirks |= WACOM_QUIRK_BATTERY;
                }
        }
}

int wacom_setup_pen_input_capabilities(struct input_dev *input_dev,
                                   struct wacom_wac *wacom_wac)
{
        struct wacom_features *features = &wacom_wac->features;

        input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);

        if (!(features->device_type & WACOM_DEVICETYPE_PEN))
                return -ENODEV;

        if (features->type == HID_GENERIC)
                /* setup has already been done */
                return 0;

        __set_bit(BTN_TOUCH, input_dev->keybit);
        __set_bit(ABS_MISC, input_dev->absbit);

        input_set_abs_params(input_dev, ABS_X, features->x_min,
                             features->x_max, features->x_fuzz, 0);
        input_set_abs_params(input_dev, ABS_Y, features->y_min,
                             features->y_max, features->y_fuzz, 0);
        input_set_abs_params(input_dev, ABS_PRESSURE, 0,
                features->pressure_max, features->pressure_fuzz, 0);

        /* penabled devices have fixed resolution for each model */
        input_abs_set_res(input_dev, ABS_X, features->x_resolution);
        input_abs_set_res(input_dev, ABS_Y, features->y_resolution);


        switch (features->type) {
        case GRAPHIRE_BT:
                __clear_bit(ABS_MISC, input_dev->absbit);

        case WACOM_MO:
        case WACOM_G4:
                input_set_abs_params(input_dev, ABS_DISTANCE, 0,
                                              features->distance_max,
                                              features->distance_fuzz, 0);
                /* fall through */

        case GRAPHIRE:
                input_set_capability(input_dev, EV_REL, REL_WHEEL);

                __set_bit(BTN_LEFT, input_dev->keybit);
                __set_bit(BTN_RIGHT, input_dev->keybit);
                __set_bit(BTN_MIDDLE, input_dev->keybit);

                __set_bit(BTN_TOOL_RUBBER, input_dev->keybit);
                __set_bit(BTN_TOOL_PEN, input_dev->keybit);
                __set_bit(BTN_TOOL_MOUSE, input_dev->keybit);
                __set_bit(BTN_STYLUS, input_dev->keybit);
                __set_bit(BTN_STYLUS2, input_dev->keybit);

                __set_bit(INPUT_PROP_POINTER, input_dev->propbit);
                break;

        case WACOM_27QHD:
        case WACOM_24HD:
        case DTK:
        case WACOM_22HD:
        case WACOM_21UX2:
        case WACOM_BEE:
        case CINTIQ:
        case WACOM_13HD:
        case CINTIQ_HYBRID:
        case CINTIQ_COMPANION_2:
                input_set_abs_params(input_dev, ABS_Z, -900, 899, 0, 0);
                input_abs_set_res(input_dev, ABS_Z, 287);
                __set_bit(INPUT_PROP_DIRECT, input_dev->propbit);
                wacom_setup_cintiq(wacom_wac);
                break;

        case INTUOS3:
        case INTUOS3L:
        case INTUOS3S:
        case INTUOS4:
        case INTUOS4WL:
        case INTUOS4L:
        case INTUOS4S:
                input_set_abs_params(input_dev, ABS_Z, -900, 899, 0, 0);
                input_abs_set_res(input_dev, ABS_Z, 287);
                /* fall through */

        case INTUOS:
                __set_bit(INPUT_PROP_POINTER, input_dev->propbit);

                wacom_setup_intuos(wacom_wac);
                break;

        case INTUOS5:
        case INTUOS5L:
        case INTUOSPM:
        case INTUOSPL:
        case INTUOS5S:
        case INTUOSPS:
                __set_bit(INPUT_PROP_POINTER, input_dev->propbit);

                input_set_abs_params(input_dev, ABS_DISTANCE, 0,
                                      features->distance_max,
                                      features->distance_fuzz, 0);

                input_set_abs_params(input_dev, ABS_Z, -900, 899, 0, 0);
                input_abs_set_res(input_dev, ABS_Z, 287);

                wacom_setup_intuos(wacom_wac);
                break;

        case WACOM_24HDT:
        case WACOM_27QHDT:
        case MTSCREEN:
        case MTTPC:
        case MTTPC_B:
        case TABLETPC2FG:
        case TABLETPC:
        case TABLETPCE:
                __clear_bit(ABS_MISC, input_dev->absbit);
                /* fall through */

        case DTUS:
        case DTUSX:
        case PL:
        case DTU:
                __set_bit(BTN_TOOL_PEN, input_dev->keybit);
                __set_bit(BTN_TOOL_RUBBER, input_dev->keybit);
                __set_bit(BTN_STYLUS, input_dev->keybit);
                __set_bit(BTN_STYLUS2, input_dev->keybit);

                __set_bit(INPUT_PROP_DIRECT, input_dev->propbit);
                break;

        case PTU:
                __set_bit(BTN_STYLUS2, input_dev->keybit);
                /* fall through */

        case PENPARTNER:
                __set_bit(BTN_TOOL_PEN, input_dev->keybit);
                __set_bit(BTN_TOOL_RUBBER, input_dev->keybit);
                __set_bit(BTN_STYLUS, input_dev->keybit);

                __set_bit(INPUT_PROP_POINTER, input_dev->propbit);
                break;

        case INTUOSHT:
        case BAMBOO_PT:
        case BAMBOO_PEN:
        case INTUOSHT2:
                __set_bit(INPUT_PROP_POINTER, input_dev->propbit);

                if (features->type == INTUOSHT2) {
                        wacom_setup_basic_pro_pen(wacom_wac);
                } else {
                        __clear_bit(ABS_MISC, input_dev->absbit);
                        __set_bit(BTN_TOOL_PEN, input_dev->keybit);
                        __set_bit(BTN_TOOL_RUBBER, input_dev->keybit);
                        __set_bit(BTN_STYLUS, input_dev->keybit);
                        __set_bit(BTN_STYLUS2, input_dev->keybit);
                        input_set_abs_params(input_dev, ABS_DISTANCE, 0,
                                      features->distance_max,
                                      features->distance_fuzz, 0);
                }
                break;
        case BAMBOO_PAD:
                __clear_bit(ABS_MISC, input_dev->absbit);
                break;
        }
        return 0;
}

int wacom_setup_touch_input_capabilities(struct input_dev *input_dev,
                                         struct wacom_wac *wacom_wac)
{
        struct wacom_features *features = &wacom_wac->features;

        input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);

        if (!(features->device_type & WACOM_DEVICETYPE_TOUCH))
                return -ENODEV;

        if (features->type == HID_GENERIC)
                /* setup has already been done */
                return 0;

        __set_bit(BTN_TOUCH, input_dev->keybit);

        if (features->touch_max == 1) {
                input_set_abs_params(input_dev, ABS_X, 0,
                        features->x_max, features->x_fuzz, 0);
                input_set_abs_params(input_dev, ABS_Y, 0,
                        features->y_max, features->y_fuzz, 0);
                input_abs_set_res(input_dev, ABS_X,
                                  features->x_resolution);
                input_abs_set_res(input_dev, ABS_Y,
                                  features->y_resolution);
        }
        else if (features->touch_max > 1) {
                input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0,
                        features->x_max, features->x_fuzz, 0);
                input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0,
                        features->y_max, features->y_fuzz, 0);
                input_abs_set_res(input_dev, ABS_MT_POSITION_X,
                                  features->x_resolution);
                input_abs_set_res(input_dev, ABS_MT_POSITION_Y,
                                  features->y_resolution);
        }

        switch (features->type) {
        case INTUOS5:
        case INTUOS5L:
        case INTUOSPM:
        case INTUOSPL:
        case INTUOS5S:
        case INTUOSPS:
                __set_bit(INPUT_PROP_POINTER, input_dev->propbit);

                input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, features->x_max, 0, 0);
                input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR, 0, features->y_max, 0, 0);
                input_mt_init_slots(input_dev, features->touch_max, INPUT_MT_POINTER);
                break;

        case WACOM_24HDT:
                input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, features->x_max, 0, 0);
                input_set_abs_params(input_dev, ABS_MT_WIDTH_MAJOR, 0, features->x_max, 0, 0);
                input_set_abs_params(input_dev, ABS_MT_WIDTH_MINOR, 0, features->y_max, 0, 0);
                input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0);
                /* fall through */

        case WACOM_27QHDT:
        case MTSCREEN:
        case MTTPC:
        case MTTPC_B:
        case TABLETPC2FG:
                input_mt_init_slots(input_dev, features->touch_max, INPUT_MT_DIRECT);
                /*fall through */

        case TABLETPC:
        case TABLETPCE:
                __set_bit(INPUT_PROP_DIRECT, input_dev->propbit);
                break;

        case INTUOSHT:
        case INTUOSHT2:
                input_dev->evbit[0] |= BIT_MASK(EV_SW);
                __set_bit(SW_MUTE_DEVICE, input_dev->swbit);
                /* fall through */

        case BAMBOO_PT:
        case BAMBOO_TOUCH:
                if (features->pktlen == WACOM_PKGLEN_BBTOUCH3) {
                        input_set_abs_params(input_dev,
                                     ABS_MT_TOUCH_MAJOR,
                                     0, features->x_max, 0, 0);
                        input_set_abs_params(input_dev,
                                     ABS_MT_TOUCH_MINOR,
                                     0, features->y_max, 0, 0);
                }
                input_mt_init_slots(input_dev, features->touch_max, INPUT_MT_POINTER);
                break;

        case BAMBOO_PAD:
                input_mt_init_slots(input_dev, features->touch_max,
                                    INPUT_MT_POINTER);
                __set_bit(BTN_LEFT, input_dev->keybit);
                __set_bit(BTN_RIGHT, input_dev->keybit);
                break;
        }
        return 0;
}

static void wacom_setup_numbered_buttons(struct input_dev *input_dev,
                                int button_count)
{
        int i;

        for (i = 0; i < button_count && i < 10; i++)
                __set_bit(BTN_0 + i, input_dev->keybit);
        for (i = 10; i < button_count && i < 16; i++)
                __set_bit(BTN_A + (i-10), input_dev->keybit);
        for (i = 16; i < button_count && i < 18; i++)
                __set_bit(BTN_BASE + (i-16), input_dev->keybit);
}

static void wacom_report_numbered_buttons(struct input_dev *input_dev,
                                int button_count, int mask)
{
        int i;

        for (i = 0; i < button_count && i < 10; i++)
                input_report_key(input_dev, BTN_0 + i, mask & (1 << i));
        for (i = 10; i < button_count && i < 16; i++)
                input_report_key(input_dev, BTN_A + (i-10), mask & (1 << i));
        for (i = 16; i < button_count && i < 18; i++)
                input_report_key(input_dev, BTN_BASE + (i-16), mask & (1 << i));
}

int wacom_setup_pad_input_capabilities(struct input_dev *input_dev,
                                   struct wacom_wac *wacom_wac)
{
        struct wacom_features *features = &wacom_wac->features;

        if (!(features->device_type & WACOM_DEVICETYPE_PAD))
                return -ENODEV;

        input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);

        /* kept for making legacy xf86-input-wacom working with the wheels */
        __set_bit(ABS_MISC, input_dev->absbit);

        /* kept for making legacy xf86-input-wacom accepting the pad */
        input_set_abs_params(input_dev, ABS_X, 0, 1, 0, 0);
        input_set_abs_params(input_dev, ABS_Y, 0, 1, 0, 0);

        /* kept for making udev and libwacom accepting the pad */
        __set_bit(BTN_STYLUS, input_dev->keybit);

        wacom_setup_numbered_buttons(input_dev, features->numbered_buttons);

        switch (features->type) {

        case CINTIQ_HYBRID:
        case CINTIQ_COMPANION_2:
        case DTK:
        case DTUS:
        case GRAPHIRE_BT:
                break;

        case WACOM_MO:
                __set_bit(BTN_BACK, input_dev->keybit);
                __set_bit(BTN_LEFT, input_dev->keybit);
                __set_bit(BTN_FORWARD, input_dev->keybit);
                __set_bit(BTN_RIGHT, input_dev->keybit);
                input_set_abs_params(input_dev, ABS_WHEEL, 0, 71, 0, 0);
                break;

        case WACOM_G4:
                __set_bit(BTN_BACK, input_dev->keybit);
                __set_bit(BTN_FORWARD, input_dev->keybit);
                input_set_capability(input_dev, EV_REL, REL_WHEEL);
                break;

        case WACOM_24HD:
                __set_bit(KEY_PROG1, input_dev->keybit);
                __set_bit(KEY_PROG2, input_dev->keybit);
                __set_bit(KEY_PROG3, input_dev->keybit);

                input_set_abs_params(input_dev, ABS_WHEEL, 0, 71, 0, 0);
                input_set_abs_params(input_dev, ABS_THROTTLE, 0, 71, 0, 0);
                break;

        case WACOM_27QHD:
                __set_bit(KEY_PROG1, input_dev->keybit);
                __set_bit(KEY_PROG2, input_dev->keybit);
                __set_bit(KEY_PROG3, input_dev->keybit);
                input_set_abs_params(input_dev, ABS_X, -2048, 2048, 0, 0);
                input_abs_set_res(input_dev, ABS_X, 1024); /* points/g */
                input_set_abs_params(input_dev, ABS_Y, -2048, 2048, 0, 0);
                input_abs_set_res(input_dev, ABS_Y, 1024);
                input_set_abs_params(input_dev, ABS_Z, -2048, 2048, 0, 0);
                input_abs_set_res(input_dev, ABS_Z, 1024);
                __set_bit(INPUT_PROP_ACCELEROMETER, input_dev->propbit);
                break;

        case WACOM_22HD:
                __set_bit(KEY_PROG1, input_dev->keybit);
                __set_bit(KEY_PROG2, input_dev->keybit);
                __set_bit(KEY_PROG3, input_dev->keybit);
                /* fall through */

        case WACOM_21UX2:
        case WACOM_BEE:
        case CINTIQ:
                input_set_abs_params(input_dev, ABS_RX, 0, 4096, 0, 0);
                input_set_abs_params(input_dev, ABS_RY, 0, 4096, 0, 0);
                break;

        case WACOM_13HD:
                input_set_abs_params(input_dev, ABS_WHEEL, 0, 71, 0, 0);
                break;

        case INTUOS3:
        case INTUOS3L:
                input_set_abs_params(input_dev, ABS_RY, 0, 4096, 0, 0);
                /* fall through */

        case INTUOS3S:
                input_set_abs_params(input_dev, ABS_RX, 0, 4096, 0, 0);
                break;

        case INTUOS5:
        case INTUOS5L:
        case INTUOSPM:
        case INTUOSPL:
        case INTUOS5S:
        case INTUOSPS:
                input_set_abs_params(input_dev, ABS_WHEEL, 0, 71, 0, 0);
                break;

        case INTUOS4WL:
                /*
                 * For Bluetooth devices, the udev rule does not work correctly
                 * for pads unless we add a stylus capability, which forces
                 * ID_INPUT_TABLET to be set.
                 */
                __set_bit(BTN_STYLUS, input_dev->keybit);
                /* fall through */

        case INTUOS4:
        case INTUOS4L:
        case INTUOS4S:
                input_set_abs_params(input_dev, ABS_WHEEL, 0, 71, 0, 0);
                break;

        case INTUOSHT:
        case BAMBOO_PT:
        case BAMBOO_TOUCH:
        case INTUOSHT2:
                __clear_bit(ABS_MISC, input_dev->absbit);

                __set_bit(BTN_LEFT, input_dev->keybit);
                __set_bit(BTN_FORWARD, input_dev->keybit);
                __set_bit(BTN_BACK, input_dev->keybit);
                __set_bit(BTN_RIGHT, input_dev->keybit);

                break;

        case REMOTE:
                input_set_capability(input_dev, EV_MSC, MSC_SERIAL);
                input_set_abs_params(input_dev, ABS_WHEEL, 0, 71, 0, 0);
                break;

        default:
                /* no pad supported */
                return -ENODEV;
        }
        return 0;
}

static const struct wacom_features wacom_features_0x00 =
        { "Wacom Penpartner", 5040, 3780, 255, 0,
          PENPARTNER, WACOM_PENPRTN_RES, WACOM_PENPRTN_RES };
static const struct wacom_features wacom_features_0x10 =
        { "Wacom Graphire", 10206, 7422, 511, 63,
          GRAPHIRE, WACOM_GRAPHIRE_RES, WACOM_GRAPHIRE_RES };
static const struct wacom_features wacom_features_0x81 =
        { "Wacom Graphire BT", 16704, 12064, 511, 32,
          GRAPHIRE_BT, WACOM_GRAPHIRE_RES, WACOM_GRAPHIRE_RES, 2 };
static const struct wacom_features wacom_features_0x11 =
        { "Wacom Graphire2 4x5", 10206, 7422, 511, 63,
          GRAPHIRE, WACOM_GRAPHIRE_RES, WACOM_GRAPHIRE_RES };
static const struct wacom_features wacom_features_0x12 =
        { "Wacom Graphire2 5x7", 13918, 10206, 511, 63,
          GRAPHIRE, WACOM_GRAPHIRE_RES, WACOM_GRAPHIRE_RES };
static const struct wacom_features wacom_features_0x13 =
        { "Wacom Graphire3", 10208, 7424, 511, 63,
          GRAPHIRE, WACOM_GRAPHIRE_RES, WACOM_GRAPHIRE_RES };
static const struct wacom_features wacom_features_0x14 =
        { "Wacom Graphire3 6x8", 16704, 12064, 511, 63,
          GRAPHIRE, WACOM_GRAPHIRE_RES, WACOM_GRAPHIRE_RES };
static const struct wacom_features wacom_features_0x15 =
        { "Wacom Graphire4 4x5", 10208, 7424, 511, 63,
          WACOM_G4, WACOM_GRAPHIRE_RES, WACOM_GRAPHIRE_RES };
static const struct wacom_features wacom_features_0x16 =
        { "Wacom Graphire4 6x8", 16704, 12064, 511, 63,
          WACOM_G4, WACOM_GRAPHIRE_RES, WACOM_GRAPHIRE_RES };
static const struct wacom_features wacom_features_0x17 =
        { "Wacom BambooFun 4x5", 14760, 9225, 511, 63,
          WACOM_MO, WACOM_INTUOS_RES, WACOM_INTUOS_RES };
static const struct wacom_features wacom_features_0x18 =
        { "Wacom BambooFun 6x8", 21648, 13530, 511, 63,
          WACOM_MO, WACOM_INTUOS_RES, WACOM_INTUOS_RES };
static const struct wacom_features wacom_features_0x19 =
        { "Wacom Bamboo1 Medium", 16704, 12064, 511, 63,
          GRAPHIRE, WACOM_GRAPHIRE_RES, WACOM_GRAPHIRE_RES };
static const struct wacom_features wacom_features_0x60 =
        { "Wacom Volito", 5104, 3712, 511, 63,
          GRAPHIRE, WACOM_VOLITO_RES, WACOM_VOLITO_RES };
static const struct wacom_features wacom_features_0x61 =
        { "Wacom PenStation2", 3250, 2320, 255, 63,
          GRAPHIRE, WACOM_VOLITO_RES, WACOM_VOLITO_RES };
static const struct wacom_features wacom_features_0x62 =
        { "Wacom Volito2 4x5", 5104, 3712, 511, 63,
          GRAPHIRE, WACOM_VOLITO_RES, WACOM_VOLITO_RES };
static const struct wacom_features wacom_features_0x63 =
        { "Wacom Volito2 2x3", 3248, 2320, 511, 63,
          GRAPHIRE, WACOM_VOLITO_RES, WACOM_VOLITO_RES };
static const struct wacom_features wacom_features_0x64 =
        { "Wacom PenPartner2", 3250, 2320, 511, 63,
          GRAPHIRE, WACOM_VOLITO_RES, WACOM_VOLITO_RES };
static const struct wacom_features wacom_features_0x65 =
        { "Wacom Bamboo", 14760, 9225, 511, 63,
          WACOM_MO, WACOM_INTUOS_RES, WACOM_INTUOS_RES };
static const struct wacom_features wacom_features_0x69 =
        { "Wacom Bamboo1", 5104, 3712, 511, 63,
          GRAPHIRE, WACOM_PENPRTN_RES, WACOM_PENPRTN_RES };
static const struct wacom_features wacom_features_0x6A =
        { "Wacom Bamboo1 4x6", 14760, 9225, 1023, 63,
          GRAPHIRE, WACOM_INTUOS_RES, WACOM_INTUOS_RES };
static const struct wacom_features wacom_features_0x6B =
        { "Wacom Bamboo1 5x8", 21648, 13530, 1023, 63,
          GRAPHIRE, WACOM_INTUOS_RES, WACOM_INTUOS_RES };
static const struct wacom_features wacom_features_0x20 =
        { "Wacom Intuos 4x5", 12700, 10600, 1023, 31,
          INTUOS, WACOM_INTUOS_RES, WACOM_INTUOS_RES };
static const struct wacom_features wacom_features_0x21 =
        { "Wacom Intuos 6x8", 20320, 16240, 1023, 31,
          INTUOS, WACOM_INTUOS_RES, WACOM_INTUOS_RES };
static const struct wacom_features wacom_features_0x22 =
        { "Wacom Intuos 9x12", 30480, 24060, 1023, 31,
          INTUOS, WACOM_INTUOS_RES, WACOM_INTUOS_RES };
static const struct wacom_features wacom_features_0x23 =
        { "Wacom Intuos 12x12", 30480, 31680, 1023, 31,
          INTUOS, WACOM_INTUOS_RES, WACOM_INTUOS_RES };
static const struct wacom_features wacom_features_0x24 =
        { "Wacom Intuos 12x18", 45720, 31680, 1023, 31,
          INTUOS, WACOM_INTUOS_RES, WACOM_INTUOS_RES };
static const struct wacom_features wacom_features_0x30 =
        { "Wacom PL400", 5408, 4056, 255, 0,
          PL, WACOM_PL_RES, WACOM_PL_RES };
static const struct wacom_features wacom_features_0x31 =
        { "Wacom PL500", 6144, 4608, 255, 0,
          PL, WACOM_PL_RES, WACOM_PL_RES };
static const struct wacom_features wacom_features_0x32 =
        { "Wacom PL600", 6126, 4604, 255, 0,
          PL, WACOM_PL_RES, WACOM_PL_RES };
static const struct wacom_features wacom_features_0x33 =
        { "Wacom PL600SX", 6260, 5016, 255, 0,
          PL, WACOM_PL_RES, WACOM_PL_RES };
static const struct wacom_features wacom_features_0x34 =