// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * drivers/input/tablet/wacom_wac.c
 *
 *  USB Wacom tablet support - Wacom specific code
 */

/*
 */

#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 bool touch_arbitration = 1;
module_param(touch_arbitration, bool, 0644);
MODULE_PARM_DESC(touch_arbitration, " on (Y) off (N)");

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

static int wacom_numbered_button_to_key(int n);

static void wacom_update_led(struct wacom *wacom, int button_count, int mask,
                             int group);
/*
 * 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_battery *battery,
                                   int bat_status, int bat_capacity,
                                   bool bat_charging, bool bat_connected,
                                   bool ps_connected)
{
        bool changed = battery->bat_status       != bat_status    ||
                       battery->battery_capacity != bat_capacity  ||
                       battery->bat_charging     != bat_charging  ||
                       battery->bat_connected    != bat_connected ||
                       battery->ps_connected     != ps_connected;

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

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

static void wacom_notify_battery(struct wacom_wac *wacom_wac,
        int bat_status, int bat_capacity, bool bat_charging,
        bool bat_connected, bool ps_connected)
{
        struct wacom *wacom = container_of(wacom_wac, struct wacom, wacom_wac);

        __wacom_notify_battery(&wacom->battery, bat_status, bat_capacity,
                               bat_charging, bat_connected, ps_connected);
}

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;
        }

        if (prox) {
                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)
{
        unsigned 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);
                                fallthrough;

                        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, WACOM_POWER_SUPPLY_STATUS_AUTO,
                                     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;
        bool wrench = false, keyboard = false, mute_touch = false, menu = false,
             info = 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);
                keyboard = !!(data[4] & 0xE0);
                info = !!(data[3] & 0x1C);

                if (features->oPid) {
                        mute_touch = !!(data[4] & 0x07);
                        if (mute_touch)
                                wacom->shared->is_touch_on =
                                        !wacom->shared->is_touch_on;
                } else {
                        wrench = !!(data[4] & 0x07);
                }
        } else if (features->type == WACOM_27QHD) {
                nkeys = 3;
                keys = data[2] & 0x07;

                wrench = !!(data[2] & 0x01);
                keyboard = !!(data[2] & 0x02);

                if (features->oPid) {
                        mute_touch = !!(data[2] & 0x04);
                        if (mute_touch)
                                wacom->shared->is_touch_on =
                                        !wacom->shared->is_touch_on;
                } else {
                        menu = !!(data[2] & 0x04);
                }
                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[2] & 0x10
                 * d-pad up     -> data[2] & 0x20
                 * d-pad left   -> data[2] & 0x40
                 * d-pad down   -> data[2] & 0x80
                 * d-pad center -> data[1] & 0x01
                 */
                buttons = ((data[2] >> 4) << 7) |
                          ((data[1] & 0x04) << 4) |
                          ((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;

                                info = !!(data[9] & 0x01);
                                wrench = !!(data[9] & 0x02);
                        }
                } else {
                        buttons = ((data[6] & 0x10) << 5)  |
                                  ((data[5] & 0x10) << 4)  |
                                  ((data[6] & 0x0F) << 4)  |
                                  (data[5] & 0x0F);
                }
                strip1 = ((data[1] & 0x1f) << 8) | data[2];
                strip2 = ((data[3] & 0x1f) << 8) | data[4];
        }

        prox = (buttons & ~(~0U << nbuttons)) | (keys & ~(~0U << 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_key(input, KEY_BUTTONCONFIG, wrench);
        input_report_key(input, KEY_ONSCREEN_KEYBOARD, keyboard);
        input_report_key(input, KEY_CONTROLPANEL, menu);
        input_report_key(input, KEY_INFO, info);

        if (wacom->shared && wacom->shared->touch_input) {
                input_report_switch(wacom->shared->touch_input,
                                    SW_MUTE_DEVICE,
                                    !wacom->shared->is_touch_on);
                input_sync(wacom->shared->touch_input);
        }

        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_id_mangle(int tool_id)
{
        return (tool_id & ~0xFFF) << 4 | (tool_id & 0xFFF);
}

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 0x12802: /* 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 0x10804: /* Intuos4/5 13HD/24HD Art Pen */
        case 0x10842: /* MobileStudio Pro Pro Pen slim */
        case 0x14802: /* Intuos4/5 13HD/24HD Classic Pen */
        case 0x16802: /* Cintiq 13HD Pro Pen */
        case 0x18802: /* DTH2242 Pen */
        case 0x10802: /* 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 0x84a:
        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 0x1480a: /* Intuos4/5 13HD/24HD Classic Pen Eraser */
        case 0x1090a: /* Intuos4/5 13HD/24HD Airbrush Eraser */
        case 0x1080c: /* Intuos4/5 13HD/24HD Art Pen Eraser */
        case 0x1084a: /* MobileStudio Pro Pro Pen slim Eraser */
        case 0x1680a: /* Cintiq 13HD Pro Pen Eraser */
        case 0x1880a: /* DTH2242 Eraser */
        case 0x1080a: /* 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 0x10902: /* Intuos4/5 13HD/24HD Airbrush */
                tool_type = BTN_TOOL_AIRBRUSH;
                break;

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

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

        /*
         * 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;
}

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) << 16) | ((data[8] & 0xf0) << 8);

                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;

                wacom_exit_report(wacom);
                return 2;
        }

        return 0;
}

static inline bool touch_is_muted(struct wacom_wac *wacom_wac)
{
        return wacom_wac->probe_complete &&
               wacom_wac->shared->has_mute_touch_switch &&
               !wacom_wac->shared->is_touch_on;
}

static inline bool report_touch_events(struct wacom_wac *wacom)
{
        return (touch_arbitration ? !wacom->shared->stylus_in_proximity : 1);
}

static inline bool delay_pen_events(struct wacom_wac *wacom)
{
        return (wacom->shared->touch_down && touch_arbitration);
}

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 (delay_pen_events(wacom))
                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] >> 16) & 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;
        }
        if (features->type == INTUOSHT2)
                distance = features->distance_max - distance;
        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_intuos_id_mangle(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 wacom_remote_irq(struct wacom_wac *wacom_wac, size_t len)
{
        unsigned char *data = wacom_wac->data;
        struct input_dev *input;
        struct wacom *wacom = container_of(wacom_wac, struct wacom, wacom_wac);
        struct wacom_remote *remote = wacom->remote;
        int bat_charging, bat_percent, touch_ring_mode;
        __u32 serial;
        int i, index = -1;
        unsigned long flags;

        if (data[0] != WACOM_REPORT_REMOTE) {
                hid_dbg(wacom->hdev, "%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;

        spin_lock_irqsave(&remote->remote_lock, flags);

        for (i = 0; i < WACOM_MAX_REMOTES; i++) {
                if (remote->remotes[i].serial == serial) {
                        index = i;
                        break;
                }
        }

        if (index < 0 || !remote->remotes[index].registered)
                goto out;

        input = remote->remotes[index].input;

        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) - 1);
        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);

        input_sync(input);

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

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

        __wacom_notify_battery(&remote->remotes[index].battery,
                                WACOM_POWER_SUPPLY_STATUS_AUTO, bat_percent,
                                bat_charging, 1, bat_charging);

out:
        spin_unlock_irqrestore(&remote->remote_lock, flags);
        return 0;
}

static void 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;
        struct wacom_remote *remote = wacom->remote;
        struct wacom_remote_data remote_data;
        unsigned long flags;
        int i, ret;

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

        memset(&remote_data, 0, sizeof(struct wacom_remote_data));

        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];

                remote_data.remote[i].serial = serial;
                remote_data.remote[i].connected = connected;
        }

        spin_lock_irqsave(&remote->remote_lock, flags);

        ret = kfifo_in(&remote->remote_fifo, &remote_data, sizeof(remote_data));
        if (ret != sizeof(remote_data)) {
                spin_unlock_irqrestore(&remote->remote_lock, flags);
                hid_err(wacom->hdev, "Can't queue Remote status event.\n");
                return;
        }

        spin_unlock_irqrestore(&remote->remote_lock, flags);

        wacom_schedule_work(wacom_wac, WACOM_WORKER_REMOTE);
}

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;
                fallthrough;
        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, WACOM_POWER_SUPPLY_STATUS_AUTO,
                                     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) &&
                        report_touch_events(wacom);

        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 void wacom_intuos_pro2_bt_pen(struct wacom_wac *wacom)
{
        int pen_frame_len, pen_frames;

        struct input_dev *pen_input = wacom->pen_input;
        unsigned char *data = wacom->data;
        int i;

        if (wacom->features.type == INTUOSP2_BT ||
            wacom->features.type == INTUOSP2S_BT) {
                wacom->serial[0] = get_unaligned_le64(&data[99]);
                wacom->id[0]     = get_unaligned_le16(&data[107]);
                pen_frame_len = 14;
                pen_frames = 7;
        } else {
                wacom->serial[0] = get_unaligned_le64(&data[33]);
                wacom->id[0]     = get_unaligned_le16(&data[41]);
                pen_frame_len = 8;
                pen_frames = 4;
        }

        if (wacom->serial[0] >> 52 == 1) {
                /* Add back in missing bits of ID for non-USI pens */
                wacom->id[0] |= (wacom->serial[0] >> 32) & 0xFFFFF;
        }

        for (i = 0; i < pen_frames; i++) {
                unsigned char *frame = &data[i*pen_frame_len + 1];
                bool valid = frame[0] & 0x80;
                bool prox = frame[0] & 0x40;
                bool range = frame[0] & 0x20;
                bool invert = frame[0] & 0x10;

                if (!valid)
                        continue;

                if (!prox) {
                        wacom->shared->stylus_in_proximity = false;
                        wacom_exit_report(wacom);
                        input_sync(pen_input);

                        wacom->tool[0] = 0;
                        wacom->id[0] = 0;
                        wacom->serial[0] = 0;
                        return;
                }

                if (range) {
                        if (!wacom->tool[0]) { /* first in range */
                                /* Going into range select tool */
                                if (invert)
                                        wacom->tool[0] = BTN_TOOL_RUBBER;
                                else if (wacom->id[0])
                                        wacom->tool[0] = wacom_intuos_get_tool_type(wacom->id[0]);
                                else
                                        wacom->tool[0] = BTN_TOOL_PEN;
                        }

                        input_report_abs(pen_input, ABS_X, get_unaligned_le16(&frame[1]));
                        input_report_abs(pen_input, ABS_Y, get_unaligned_le16(&frame[3]));

                        if (wacom->features.type == INTUOSP2_BT ||
                            wacom->features.type == INTUOSP2S_BT) {
                                /* Fix rotation alignment: userspace expects zero at left */
                                int16_t rotation =
                                        (int16_t)get_unaligned_le16(&frame[9]);
                                rotation += 1800/4;

                                if (rotation > 899)
                                        rotation -= 1800;

                                input_report_abs(pen_input, ABS_TILT_X,
                                                 (char)frame[7]);
                                input_report_abs(pen_input, ABS_TILT_Y,
                                                 (char)frame[8]);
                                input_report_abs(pen_input, ABS_Z, rotation);
                                input_report_abs(pen_input, ABS_WHEEL,
                                                 get_unaligned_le16(&frame[11]));
                        }
                }
                if (wacom->tool[0]) {
                        input_report_abs(pen_input, ABS_PRESSURE, get_unaligned_le16(&frame[5]));
                        if (wacom->features.type == INTUOSP2_BT ||
                            wacom->features.type == INTUOSP2S_BT) {
                                input_report_abs(pen_input, ABS_DISTANCE,
                                                 range ? frame[13] : wacom->features.distance_max);
                        } else {
                                input_report_abs(pen_input, ABS_DISTANCE,
                                                 range ? frame[7] : wacom->features.distance_max);
                        }

                        input_report_key(pen_input, BTN_TOUCH, frame[0] & 0x09);
                        input_report_key(pen_input, BTN_STYLUS, frame[0] & 0x02);
                        input_report_key(pen_input, BTN_STYLUS2, frame[0] & 0x04);

                        input_report_key(pen_input, wacom->tool[0], prox);
                        input_event(pen_input, EV_MSC, MSC_SERIAL, wacom->serial[0]);
                        input_report_abs(pen_input, ABS_MISC,
                                         wacom_intuos_id_mangle(wacom->id[0])); /* report tool id */
                }

                wacom->shared->stylus_in_proximity = prox;

                input_sync(pen_input);
        }
}

static void wacom_intuos_pro2_bt_touch(struct wacom_wac *wacom)
{
        const int finger_touch_len = 8;
        const int finger_frames = 4;
        const int finger_frame_len = 43;

        struct input_dev *touch_input = wacom->touch_input;
        unsigned char *data = wacom->data;
        int num_contacts_left = 5;
        int i, j;

        for (i = 0; i < finger_frames; i++) {
                unsigned char *frame = &data[i*finger_frame_len + 109];
                int current_num_contacts = frame[0] & 0x7F;
                int contacts_to_send;

                if (!(frame[0] & 0x80))
                        continue;

                /*
                 * 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 (j = 0; j < contacts_to_send; j++) {
                        unsigned char *touch = &frame[j*finger_touch_len + 1];
                        int slot = input_mt_get_slot_by_key(touch_input, touch[0]);
                        int x = get_unaligned_le16(&touch[2]);
                        int y = get_unaligned_le16(&touch[4]);
                        int w = touch[6] * input_abs_get_res(touch_input, ABS_MT_POSITION_X);
                        int h = touch[7] * input_abs_get_res(touch_input, ABS_MT_POSITION_Y);

                        if (slot < 0)
                                continue;

                        input_mt_slot(touch_input, slot);
                        input_mt_report_slot_state(touch_input, MT_TOOL_FINGER, touch[1] & 0x01);
                        input_report_abs(touch_input, ABS_MT_POSITION_X, x);
                        input_report_abs(touch_input, ABS_MT_POSITION_Y, y);
                        input_report_abs(touch_input, ABS_MT_TOUCH_MAJOR, max(w, h));
                        input_report_abs(touch_input, ABS_MT_TOUCH_MINOR, min(w, h));
                        input_report_abs(touch_input, ABS_MT_ORIENTATION, w > h);
                }

                input_mt_sync_frame(touch_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);
                        input_sync(touch_input);
                }
        }

        if (wacom->num_contacts_left == 0) {
                // Be careful that we don't accidentally call input_sync with
                // only a partial set of fingers of processed
                input_report_switch(touch_input, SW_MUTE_DEVICE, !(data[281] >> 7));
                input_sync(touch_input);
        }

}

static void wacom_intuos_pro2_bt_pad(struct wacom_wac *wacom)
{
        struct input_dev *pad_input = wacom->pad_input;
        unsigned char *data = wacom->data;
        int nbuttons = wacom->features.numbered_buttons;

        int expresskeys = data[282];
        int center = (data[281] & 0x40) >> 6;
        int ring = data[285] & 0x7F;
        bool ringstatus = data[285] & 0x80;
        bool prox = expresskeys || center || ringstatus;

        /* Fix touchring data: userspace expects 0 at left and increasing clockwise */
        ring = 71 - ring;
        ring += 3*72/16;
        if (ring > 71)
                ring -= 72;

        wacom_report_numbered_buttons(pad_input, nbuttons,
                                      expresskeys | (center << (nbuttons - 1)));

        input_report_abs(pad_input, ABS_WHEEL, ringstatus ? ring : 0);

        input_report_key(pad_input, wacom->tool[1], prox ? 1 : 0);
        input_report_abs(pad_input, ABS_MISC, prox ? PAD_DEVICE_ID : 0);
        input_event(pad_input, EV_MSC, MSC_SERIAL, 0xffffffff);

        input_sync(pad_input);
}

static void wacom_intuos_pro2_bt_battery(struct wacom_wac *wacom)
{
        unsigned char *data = wacom->data;

        bool chg = data[284] & 0x80;
        int battery_status = data[284] & 0x7F;

        wacom_notify_battery(wacom, WACOM_POWER_SUPPLY_STATUS_AUTO,
                             battery_status, chg, 1, chg);
}

static void wacom_intuos_gen3_bt_pad(struct wacom_wac *wacom)
{
        struct input_dev *pad_input = wacom->pad_input;
        unsigned char *data = wacom->data;

        int buttons = data[44];

        wacom_report_numbered_buttons(pad_input, 4, buttons);

        input_report_key(pad_input, wacom->tool[1], buttons ? 1 : 0);
        input_report_abs(pad_input, ABS_MISC, buttons ? PAD_DEVICE_ID : 0);
        input_event(pad_input, EV_MSC, MSC_SERIAL, 0xffffffff);

        input_sync(pad_input);
}

static void wacom_intuos_gen3_bt_battery(struct wacom_wac *wacom)
{
        unsigned char *data = wacom->data;

        bool chg = data[45] & 0x80;
        int battery_status = data[45] & 0x7F;

        wacom_notify_battery(wacom, WACOM_POWER_SUPPLY_STATUS_AUTO,
                             battery_status, chg, 1, chg);
}

static int wacom_intuos_pro2_bt_irq(struct wacom_wac *wacom, size_t len)
{
        unsigned char *data = wacom->data;

        if (data[0] != 0x80 && data[0] != 0x81) {
                dev_dbg(wacom->pen_input->dev.parent,
                        "%s: received unknown report #%d\n", __func__, data[0]);
                return 0;
        }

        wacom_intuos_pro2_bt_pen(wacom);
        if (wacom->features.type == INTUOSP2_BT ||
            wacom->features.type == INTUOSP2S_BT) {
                wacom_intuos_pro2_bt_touch(wacom);
                wacom_intuos_pro2_bt_pad(wacom);
                wacom_intuos_pro2_bt_battery(wacom);
        } else {
                wacom_intuos_gen3_bt_pad(wacom);
                wacom_intuos_gen3_bt_battery(wacom);
        }
        return 0;
}

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 (touch_is_muted(wacom) && !wacom->shared->touch_down)
                return 0;

        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) && report_touch_events(wacom);
                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) && report_touch_events(wacom);
                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 && report_touch_events(wacom);

                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 = report_touch_events(wacom);
        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
         * or touch arbitration is off
         */
        if (!delay_pen_events(wacom)) {
                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]);

                if (len == WACOM_PKGLEN_PENABLED ||
                    data[0] == WACOM_REPORT_PENABLED)
                        return wacom_tpc_pen(wacom);
        }
        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);

                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);

                        }
                }
        }

        return 0;
}

static int wacom_offset_rotation(struct input_dev *input, struct hid_usage *usage,
                                 int value, int num, int denom)
{
        struct input_absinfo *abs = &input->absinfo[usage->code];
        int range = (abs->maximum - abs->minimum + 1);

        value += num*range/denom;
        if (value > abs->maximum)
                value -= range;
        else if (value < abs->minimum)
                value += range;
        return value;
}

int wacom_equivalent_usage(int usage)
{
        if ((usage & HID_USAGE_PAGE) == WACOM_HID_UP_WACOMDIGITIZER) {
                int subpage = (usage & 0xFF00) << 8;
                int subusage = (usage & 0xFF);

                if (subpage == WACOM_HID_SP_PAD ||
                    subpage == WACOM_HID_SP_BUTTON ||
                    subpage == WACOM_HID_SP_DIGITIZER ||
                    subpage == WACOM_HID_SP_DIGITIZERINFO ||
                    usage == WACOM_HID_WD_SENSE ||
                    usage == WACOM_HID_WD_SERIALHI ||
                    usage == WACOM_HID_WD_TOOLTYPE ||
                    usage == WACOM_HID_WD_DISTANCE ||
                    usage == WACOM_HID_WD_TOUCHSTRIP ||
                    usage == WACOM_HID_WD_TOUCHSTRIP2 ||
                    usage == WACOM_HID_WD_TOUCHRING ||
                    usage == WACOM_HID_WD_TOUCHRINGSTATUS ||
                    usage == WACOM_HID_WD_REPORT_VALID) {
                        return usage;
                }

                if (subpage == HID_UP_UNDEFINED)
                        subpage = HID_UP_DIGITIZER;

                return subpage | subusage;
        }

        if ((usage & HID_USAGE_PAGE) == WACOM_HID_UP_WACOMTOUCH) {
                int subpage = (usage & 0xFF00) << 8;
                int subusage = (usage & 0xFF);

                if (usage == WACOM_HID_WT_REPORT_VALID)
                        return usage;

                if (subpage == HID_UP_UNDEFINED)
                        subpage = WACOM_HID_SP_DIGITIZER;

                return subpage | subusage;
        }

        return usage;
}

static void wacom_map_usage(struct input_dev *input, struct hid_usage *usage,
                struct hid_field *field, __u8 type, __u16 code, int fuzz)
{
        struct wacom *wacom = input_get_drvdata(input);
        struct wacom_wac *wacom_wac = &wacom->wacom_wac;
        struct wacom_features *features = &wacom_wac->features;
        int fmin = field->logical_minimum;
        int fmax = field->logical_maximum;
        unsigned int equivalent_usage = wacom_equivalent_usage(usage->hid);
        int resolution_code = code;

        if (equivalent_usage == HID_DG_TWIST) {
                resolution_code = ABS_RZ;
        }

        if (equivalent_usage == HID_GD_X) {
                fmin += features->offset_left;
                fmax -= features->offset_right;
        }
        if (equivalent_usage == HID_GD_Y) {
                fmin += features->offset_top;
                fmax -= features->offset_bottom;
        }

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

        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, resolution_code));
                break;
        case EV_KEY:
        case EV_MSC:
        case EV_SW:
                input_set_capability(input, type, code);
                break;
        }
}

static void wacom_wac_battery_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;
        unsigned equivalent_usage = wacom_equivalent_usage(usage->hid);

        switch (equivalent_usage) {
        case HID_DG_BATTERYSTRENGTH:
        case WACOM_HID_WD_BATTERY_LEVEL:
        case WACOM_HID_WD_BATTERY_CHARGING:
                features->quirks |= WACOM_QUIRK_BATTERY;
                break;
        }
}

static void wacom_wac_battery_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;
        unsigned equivalent_usage = wacom_equivalent_usage(usage->hid);

        switch (equivalent_usage) {
        case HID_DG_BATTERYSTRENGTH:
                if (value == 0) {
                        wacom_wac->hid_data.bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
                }
                else {
                        value = value * 100 / (field->logical_maximum - field->logical_minimum);
                        wacom_wac->hid_data.battery_capacity = value;
                        wacom_wac->hid_data.bat_connected = 1;
                        wacom_wac->hid_data.bat_status = WACOM_POWER_SUPPLY_STATUS_AUTO;
                }
                break;
        case WACOM_HID_WD_BATTERY_LEVEL:
                value = value * 100 / (field->logical_maximum - field->logical_minimum);
                wacom_wac->hid_data.battery_capacity = value;
                wacom_wac->hid_data.bat_connected = 1;
                wacom_wac->hid_data.bat_status = WACOM_POWER_SUPPLY_STATUS_AUTO;
                break;
        case WACOM_HID_WD_BATTERY_CHARGING:
                wacom_wac->hid_data.bat_charging = value;
                wacom_wac->hid_data.ps_connected = value;
                wacom_wac->hid_data.bat_connected = 1;
                wacom_wac->hid_data.bat_status = WACOM_POWER_SUPPLY_STATUS_AUTO;
                break;
        }
}

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

static void wacom_wac_battery_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 wacom_features *features = &wacom_wac->features;

        if (features->quirks & WACOM_QUIRK_BATTERY) {
                int status = wacom_wac->hid_data.bat_status;
                int capacity = wacom_wac->hid_data.battery_capacity;
                bool charging = wacom_wac->hid_data.bat_charging;
                bool connected = wacom_wac->hid_data.bat_connected;
                bool powered = wacom_wac->hid_data.ps_connected;

                wacom_notify_battery(wacom_wac, status, capacity, charging,
                                     connected, powered);
        }
}

static void wacom_wac_pad_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->pad_input;
        unsigned equivalent_usage = wacom_equivalent_usage(usage->hid);

        switch (equivalent_usage) {
        case WACOM_HID_WD_ACCELEROMETER_X:
                __set_bit(INPUT_PROP_ACCELEROMETER, input->propbit);
                wacom_map_usage(input, usage, field, EV_ABS, ABS_X, 0);
                features->device_type |= WACOM_DEVICETYPE_PAD;
                break;
        case WACOM_HID_WD_ACCELEROMETER_Y:
                __set_bit(INPUT_PROP_ACCELEROMETER, input->propbit);
                wacom_map_usage(input, usage, field, EV_ABS, ABS_Y, 0);
                features->device_type |= WACOM_DEVICETYPE_PAD;
                break;
        case WACOM_HID_WD_ACCELEROMETER_Z:
                __set_bit(INPUT_PROP_ACCELEROMETER, input->propbit);
                wacom_map_usage(input, usage, field, EV_ABS, ABS_Z, 0);
                features->device_type |= WACOM_DEVICETYPE_PAD;
                break;
        case WACOM_HID_WD_BUTTONCENTER:
        case WACOM_HID_WD_BUTTONHOME:
        case WACOM_HID_WD_BUTTONUP:
        case WACOM_HID_WD_BUTTONDOWN:
        case WACOM_HID_WD_BUTTONLEFT:
        case WACOM_HID_WD_BUTTONRIGHT:
                wacom_map_usage(input, usage, field, EV_KEY,
                                wacom_numbered_button_to_key(features->numbered_buttons),
                                0);
                features->numbered_buttons++;
                features->device_type |= WACOM_DEVICETYPE_PAD;
                break;
        case WACOM_HID_WD_MUTE_DEVICE:
                /* softkey touch switch */
                wacom_wac->is_soft_touch_switch = true;
                fallthrough;
        case WACOM_HID_WD_TOUCHONOFF:
                /*
                 * These two usages, which are used to mute touch events, come

                 * from the pad packet, but are reported on the touch
                 * interface. Because the touch interface may not have
                 * been created yet, we cannot call wacom_map_usage(). In
                 * order to process the usages when we receive them, we set
                 * the usage type and code directly.
                 */
                wacom_wac->has_mute_touch_switch = true;
                usage->type = EV_SW;
                usage->code = SW_MUTE_DEVICE;
                features->device_type |= WACOM_DEVICETYPE_PAD;
                break;
        case WACOM_HID_WD_TOUCHSTRIP:
                wacom_map_usage(input, usage, field, EV_ABS, ABS_RX, 0);
                features->device_type |= WACOM_DEVICETYPE_PAD;
                break;
        case WACOM_HID_WD_TOUCHSTRIP2:
                wacom_map_usage(input, usage, field, EV_ABS, ABS_RY, 0);
                features->device_type |= WACOM_DEVICETYPE_PAD;
                break;
        case WACOM_HID_WD_TOUCHRING:
                wacom_map_usage(input, usage, field, EV_ABS, ABS_WHEEL, 0);
                features->device_type |= WACOM_DEVICETYPE_PAD;
                break;
        case WACOM_HID_WD_TOUCHRINGSTATUS:
                /*
                 * Only set up type/code association. Completely mapping
                 * this usage may overwrite the axis resolution and range.
                 */
                usage->type = EV_ABS;
                usage->code = ABS_WHEEL;
                set_bit(EV_ABS, input->evbit);
                features->device_type |= WACOM_DEVICETYPE_PAD;
                break;
        case WACOM_HID_WD_BUTTONCONFIG:
                wacom_map_usage(input, usage, field, EV_KEY, KEY_BUTTONCONFIG, 0);
                features->device_type |= WACOM_DEVICETYPE_PAD;
                break;
        case WACOM_HID_WD_ONSCREEN_KEYBOARD:
                wacom_map_usage(input, usage, field, EV_KEY, KEY_ONSCREEN_KEYBOARD, 0);
                features->device_type |= WACOM_DEVICETYPE_PAD;
                break;
        case WACOM_HID_WD_CONTROLPANEL:
                wacom_map_usage(input, usage, field, EV_KEY, KEY_CONTROLPANEL, 0);
                features->device_type |= WACOM_DEVICETYPE_PAD;
                break;
        case WACOM_HID_WD_MODE_CHANGE:
                /* do not overwrite previous data */
                if (!wacom_wac->has_mode_change) {
                        wacom_wac->has_mode_change = true;
                        wacom_wac->is_direct_mode = true;
                }
                features->device_type |= WACOM_DEVICETYPE_PAD;
                break;
        }

        switch (equivalent_usage & 0xfffffff0) {
        case WACOM_HID_WD_EXPRESSKEY00:
                wacom_map_usage(input, usage, field, EV_KEY,
                                wacom_numbered_button_to_key(features->numbered_buttons),
                                0);
                features->numbered_buttons++;
                features->device_type |= WACOM_DEVICETYPE_PAD;
                break;
        }
}

static void wacom_wac_pad_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->pad_input;
        struct wacom_features *features = &wacom_wac->features;
        unsigned equivalent_usage = wacom_equivalent_usage(usage->hid);
        int i;
        bool do_report = false;

        /*
         * Avoid reporting this event and setting inrange_state if this usage
         * hasn't been mapped.
         */
        if (!usage->type && equivalent_usage != WACOM_HID_WD_MODE_CHANGE)
                return;

        if (wacom_equivalent_usage(field->physical) == HID_DG_TABLETFUNCTIONKEY) {
                if (usage->hid != WACOM_HID_WD_TOUCHRING)
                        wacom_wac->hid_data.inrange_state |= value;
        }

        switch (equivalent_usage) {
        case WACOM_HID_WD_TOUCHRING:
                /*
                 * Userspace expects touchrings to increase in value with
                 * clockwise gestures and have their zero point at the
                 * tablet's left. HID events "should" be clockwise-
                 * increasing and zero at top, though the MobileStudio
                 * Pro and 2nd-gen Intuos Pro don't do this...
                 */
                if (hdev->vendor == 0x56a &&
                    (hdev->product == 0x34d || hdev->product == 0x34e ||  /* MobileStudio Pro */
                     hdev->product == 0x357 || hdev->product == 0x358 ||  /* Intuos Pro 2 */
                     hdev->product == 0x392 ||                            /* Intuos Pro 2 */
                     hdev->product == 0x398 || hdev->product == 0x399 ||  /* MobileStudio Pro */
                     hdev->product == 0x3AA)) {                           /* MobileStudio Pro */
                        value = (field->logical_maximum - value);

                        if (hdev->product == 0x357 || hdev->product == 0x358 ||
                            hdev->product == 0x392)
                                value = wacom_offset_rotation(input, usage, value, 3, 16);
                        else if (hdev->product == 0x34d || hdev->product == 0x34e ||
                                 hdev->product == 0x398 || hdev->product == 0x399 ||
                                 hdev->product == 0x3AA)
                                value = wacom_offset_rotation(input, usage, value, 1, 2);
                }
                else {
                        value = wacom_offset_rotation(input, usage, value, 1, 4);
                }
                do_report = true;
                break;
        case WACOM_HID_WD_TOUCHRINGSTATUS:
                if (!value)
                        input_event(input, usage->type, usage->code, 0);
                break;

        case WACOM_HID_WD_MUTE_DEVICE:
        case WACOM_HID_WD_TOUCHONOFF:
                if (wacom_wac->shared->touch_input) {
                        bool *is_touch_on = &wacom_wac->shared->is_touch_on;

                        if (equivalent_usage == WACOM_HID_WD_MUTE_DEVICE && value)
                                *is_touch_on = !(*is_touch_on);
                        else if (equivalent_usage == WACOM_HID_WD_TOUCHONOFF)
                                *is_touch_on = value;

                        input_report_switch(wacom_wac->shared->touch_input,
                                            SW_MUTE_DEVICE, !(*is_touch_on));
                        input_sync(wacom_wac->shared->touch_input);
                }
                break;

        case WACOM_HID_WD_MODE_CHANGE:
                if (wacom_wac->is_direct_mode != value) {
                        wacom_wac->is_direct_mode = value;
                        wacom_schedule_work(&wacom->wacom_wac, WACOM_WORKER_MODE_CHANGE);
                }
                break;

        case WACOM_HID_WD_BUTTONCENTER:
                for (i = 0; i < wacom->led.count; i++)
                        wacom_update_led(wacom, features->numbered_buttons,
                                         value, i);
                fallthrough;
        default:
                do_report = true;
                break;
        }

        if (do_report) {
                input_event(input, usage->type, usage->code, value);
                if (value)
                        wacom_wac->hid_data.pad_input_event_flag = true;
        }
}

static void wacom_wac_pad_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;

        wacom_wac->hid_data.inrange_state = 0;
}

static void wacom_wac_pad_report(struct hid_device *hdev,
                struct hid_report *report, struct hid_field *field)
{
        struct wacom *wacom = hid_get_drvdata(hdev);
        struct wacom_wac *wacom_wac = &wacom->wacom_wac;
        struct input_dev *input = wacom_wac->pad_input;
        bool active = wacom_wac->hid_data.inrange_state != 0;

        /* report prox for expresskey events */
        if (wacom_wac->hid_data.pad_input_event_flag) {
                input_event(input, EV_ABS, ABS_MISC, active ? PAD_DEVICE_ID : 0);
                input_sync(input);
                if (!active)
                        wacom_wac->hid_data.pad_input_event_flag = false;
        }
}

static void wacom_set_barrel_switch3_usage(struct wacom_wac *wacom_wac)
{
        struct input_dev *input = wacom_wac->pen_input;
        struct wacom_features *features = &wacom_wac->features;

        if (!(features->quirks & WACOM_QUIRK_AESPEN) &&
            wacom_wac->hid_data.barrelswitch &&
            wacom_wac->hid_data.barrelswitch2 &&
            wacom_wac->hid_data.serialhi)
                input_set_capability(input, EV_KEY, BTN_STYLUS3);
}

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 wacom_features *features = &wacom_wac->features;
        struct input_dev *input = wacom_wac->pen_input;
        unsigned equivalent_usage = wacom_equivalent_usage(usage->hid);

        switch (equivalent_usage) {
        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 WACOM_HID_WD_DISTANCE:
        case HID_GD_Z:
                wacom_map_usage(input, usage, field, EV_ABS, ABS_DISTANCE, 0);
                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_TILT_X:
                wacom_map_usage(input, usage, field, EV_ABS, ABS_TILT_X, 0);
                break;
        case HID_DG_TILT_Y:
                wacom_map_usage(input, usage, field, EV_ABS, ABS_TILT_Y, 0);
                break;
        case HID_DG_TWIST:
                wacom_map_usage(input, usage, field, EV_ABS, ABS_Z, 0);
                break;
        case HID_DG_ERASER:
                input_set_capability(input, EV_KEY, BTN_TOOL_RUBBER);
                wacom_map_usage(input, usage, field, EV_KEY, BTN_TOUCH, 0);
                break;
        case HID_DG_TIPSWITCH:
                input_set_capability(input, EV_KEY, BTN_TOOL_PEN);
                wacom_map_usage(input, usage, field, EV_KEY, BTN_TOUCH, 0);
                break;
        case HID_DG_BARRELSWITCH:
                wacom_wac->hid_data.barrelswitch = true;
                wacom_set_barrel_switch3_usage(wacom_wac);
                wacom_map_usage(input, usage, field, EV_KEY, BTN_STYLUS, 0);
                break;
        case HID_DG_BARRELSWITCH2:
                wacom_wac->hid_data.barrelswitch2 = true;
                wacom_set_barrel_switch3_usage(wacom_wac);
                wacom_map_usage(input, usage, field, EV_KEY, BTN_STYLUS2, 0);
                break;
        case HID_DG_TOOLSERIALNUMBER:
                features->quirks |= WACOM_QUIRK_TOOLSERIAL;
                wacom_map_usage(input, usage, field, EV_MSC, MSC_SERIAL, 0);
                break;
        case WACOM_HID_WD_SENSE:
                features->quirks |= WACOM_QUIRK_SENSE;
                wacom_map_usage(input, usage, field, EV_KEY, BTN_TOOL_PEN, 0);
                break;
        case WACOM_HID_WD_SERIALHI:
                wacom_wac->hid_data.serialhi = true;
                wacom_set_barrel_switch3_usage(wacom_wac);
                wacom_map_usage(input, usage, field, EV_ABS, ABS_MISC, 0);
                break;
        case WACOM_HID_WD_FINGERWHEEL:
                input_set_capability(input, EV_KEY, BTN_TOOL_AIRBRUSH);
                wacom_map_usage(input, usage, field, EV_ABS, ABS_WHEEL, 0);
                break;
        }
}

static void 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 wacom_features *features = &wacom_wac->features;
        struct input_dev *input = wacom_wac->pen_input;
        unsigned equivalent_usage = wacom_equivalent_usage(usage->hid);

        if (wacom_wac->is_invalid_bt_frame)
                return;

        switch (equivalent_usage) {
        case HID_GD_Z:
                /*
                 * HID_GD_Z "should increase as the control's position is
                 * moved from high to low", while ABS_DISTANCE instead
                 * increases in value as the tool moves from low to high.
                 */
                value = field->logical_maximum - value;
                break;
        case HID_DG_INRANGE:
                wacom_wac->hid_data.inrange_state = value;
                if (!(features->quirks & WACOM_QUIRK_SENSE))
                        wacom_wac->hid_data.sense_state = value;
                return;
        case HID_DG_INVERT:
                wacom_wac->hid_data.invert_state = value;
                return;
        case HID_DG_ERASER:
        case HID_DG_TIPSWITCH:
                wacom_wac->hid_data.tipswitch |= value;
                return;
        case HID_DG_BARRELSWITCH:
                wacom_wac->hid_data.barrelswitch = value;
                return;
        case HID_DG_BARRELSWITCH2:
                wacom_wac->hid_data.barrelswitch2 = value;
                return;
        case HID_DG_TOOLSERIALNUMBER:
                if (value) {
                        wacom_wac->serial[0] = (wacom_wac->serial[0] & ~0xFFFFFFFFULL);
                        wacom_wac->serial[0] |= wacom_s32tou(value, field->report_size);
                }
                return;
        case HID_DG_TWIST:
                /*
                 * Userspace expects pen twist to have its zero point when
                 * the buttons/finger is on the tablet's left. HID values
                 * are zero when buttons are toward the top.
                 */
                value = wacom_offset_rotation(input, usage, value, 1, 4);
                break;
        case WACOM_HID_WD_SENSE:
                wacom_wac->hid_data.sense_state = value;
                return;
        case WACOM_HID_WD_SERIALHI:
                if (value) {
                        __u32 raw_value = wacom_s32tou(value, field->report_size);

                        wacom_wac->serial[0] = (wacom_wac->serial[0] & 0xFFFFFFFF);
                        wacom_wac->serial[0] |= ((__u64)raw_value) << 32;
                        /*
                         * Non-USI EMR devices may contain additional tool type
                         * information here. See WACOM_HID_WD_TOOLTYPE case for
                         * more details.
                         */
                        if (value >> 20 == 1) {
                                wacom_wac->id[0] |= raw_value & 0xFFFFF;
                        }
                }
                return;
        case WACOM_HID_WD_TOOLTYPE:
                /*
                 * Some devices (MobileStudio Pro, and possibly later
                 * devices as well) do not return the complete tool
                 * type in their WACOM_HID_WD_TOOLTYPE usage. Use a
                 * bitwise OR so the complete value can be built
                 * up over time :(
                 */
                wacom_wac->id[0] |= wacom_s32tou(value, field->report_size);
                return;
        case WACOM_HID_WD_OFFSETLEFT:
                if (features->offset_left && value != features->offset_left)
                        hid_warn(hdev, "%s: overriding existing left offset "
                                 "%d -> %d\n", __func__, value,
                                 features->offset_left);
                features->offset_left = value;
                return;
        case WACOM_HID_WD_OFFSETRIGHT:
                if (features->offset_right && value != features->offset_right)
                        hid_warn(hdev, "%s: overriding existing right offset "
                                 "%d -> %d\n", __func__, value,
                                 features->offset_right);
                features->offset_right = value;
                return;
        case WACOM_HID_WD_OFFSETTOP:
                if (features->offset_top && value != features->offset_top)
                        hid_warn(hdev, "%s: overriding existing top offset "
                                 "%d -> %d\n", __func__, value,
                                 features->offset_top);
                features->offset_top = value;
                return;
        case WACOM_HID_WD_OFFSETBOTTOM:
                if (features->offset_bottom && value != features->offset_bottom)
                        hid_warn(hdev, "%s: overriding existing bottom offset "
                                 "%d -> %d\n", __func__, value,
                                 features->offset_bottom);
                features->offset_bottom = value;
                return;
        case WACOM_HID_WD_REPORT_VALID:
                wacom_wac->is_invalid_bt_frame = !value;
                return;
        }

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

        /* send pen events only when the pen is in range */
        if (wacom_wac->hid_data.inrange_state)
                input_event(input, usage->type, usage->code, value);
        else if (wacom_wac->shared->stylus_in_proximity && !wacom_wac->hid_data.sense_state)
                input_event(input, usage->type, usage->code, 0);
}

static void wacom_wac_pen_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;

        wacom_wac->is_invalid_bt_frame = false;
        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 range = wacom_wac->hid_data.inrange_state;
        bool sense = wacom_wac->hid_data.sense_state;

        if (wacom_wac->is_invalid_bt_frame)
                return;

        if (!wacom_wac->tool[0] && range) { /* first in range */
                /* Going into range select tool */
                if (wacom_wac->hid_data.invert_state)
                        wacom_wac->tool[0] = BTN_TOOL_RUBBER;
                else if (wacom_wac->id[0])
                        wacom_wac->tool[0] = wacom_intuos_get_tool_type(wacom_wac->id[0]);
                else
                        wacom_wac->tool[0] = BTN_TOOL_PEN;
        }

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

        if (!delay_pen_events(wacom_wac) && wacom_wac->tool[0]) {
                int id = wacom_wac->id[0];
                int sw_state = wacom_wac->hid_data.barrelswitch |
                               (wacom_wac->hid_data.barrelswitch2 << 1);

                input_report_key(input, BTN_STYLUS, sw_state == 1);
                input_report_key(input, BTN_STYLUS2, sw_state == 2);
                input_report_key(input, BTN_STYLUS3, sw_state == 3);

                /*
                 * Non-USI EMR tools should have their IDs mangled to
                 * match the legacy behavior of wacom_intuos_general
                 */
                if (wacom_wac->serial[0] >> 52 == 1)
                        id = wacom_intuos_id_mangle(id);

                /*
                 * To ensure compatibility with xf86-input-wacom, we should
                 * report the BTN_TOOL_* event prior to the ABS_MISC or
                 * MSC_SERIAL events.
                 */
                input_report_key(input, BTN_TOUCH,
                                wacom_wac->hid_data.tipswitch);
                input_report_key(input, wacom_wac->tool[0], sense);
                if (wacom_wac->serial[0]) {
                        input_event(input, EV_MSC, MSC_SERIAL, wacom_wac->serial[0]);
                        input_report_abs(input, ABS_MISC, sense ? id : 0);
                }

                wacom_wac->hid_data.tipswitch = false;

                input_sync(input);
        }

        if (!sense) {
                wacom_wac->tool[0] = 0;
                wacom_wac->id[0] = 0;
                wacom_wac->serial[0] = 0;
        }
}

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 input_dev *input = wacom_wac->touch_input;
        unsigned touch_max = wacom_wac->features.touch_max;
        unsigned equivalent_usage = wacom_equivalent_usage(usage->hid);

        switch (equivalent_usage) {
        case HID_GD_X:
                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:
                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:
                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_TIPSWITCH:
                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;
        case HID_DG_CONTACTID:
                if ((field->logical_maximum - field->logical_minimum) < touch_max) {
                        /*
                         * The HID descriptor for G11 sensors leaves logical
                         * maximum set to '1' despite it being a multitouch
                         * device. Override to a sensible number.
                         */
                        field->logical_maximum = 255;
                }
                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 &&
                    report_touch_events(wacom_wac);

        if (touch_is_muted(wacom_wac)) {
                if (!wacom_wac->shared->touch_down)
                        return;
                prox = false;
        }

        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);
                if (slot < 0) {
                        return;
                } else {
                        struct input_mt_slot *ps = &input->mt->slots[slot];
                        int mt_id = input_mt_get_value(ps, ABS_MT_TRACKING_ID);

                        if (!prox && mt_id < 0) {
                                // No data to send for this slot; short-circuit
                                return;
                        }
                }

                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 void 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;
        unsigned equivalent_usage = wacom_equivalent_usage(usage->hid);
        struct wacom_features *features = &wacom->wacom_wac.features;

        if (touch_is_muted(wacom_wac) && !wacom_wac->shared->touch_down)
                return;

        if (wacom_wac->is_invalid_bt_frame)
                return;

        switch (equivalent_usage) {
        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;
        case WACOM_HID_WT_REPORT_VALID:
                wacom_wac->is_invalid_bt_frame = !value;
                return;
        case HID_DG_CONTACTMAX:
                if (!features->touch_max) {
                        features->touch_max = value;
                } else {
                        hid_warn(hdev, "%s: ignoring attempt to overwrite non-zero touch_max "
                                 "%d -> %d\n", __func__, features->touch_max, value);
                }
                return;
        }

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

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;
        int i;

        if (touch_is_muted(wacom_wac) && !wacom_wac->shared->touch_down)
                return;

        wacom_wac->is_invalid_bt_frame = false;

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

                for (j = 0; j < field->maxusage; j++) {
                        struct hid_usage *usage = &field->usage[j];
                        unsigned int equivalent_usage =
                                wacom_equivalent_usage(usage->hid);

                        switch (equivalent_usage) {
                        case HID_GD_X:
                        case HID_GD_Y:
                        case HID_DG_WIDTH:
                        case HID_DG_HEIGHT:
                        case HID_DG_CONTACTID:
                        case HID_DG_INRANGE:
                        case HID_DG_INVERT:
                        case HID_DG_TIPSWITCH:
                                hid_data->last_slot_field = equivalent_usage;
                                break;
                        case HID_DG_CONTACTCOUNT:
                                hid_data->cc_report = report->id;
                                hid_data->cc_index = i;
                                hid_data->cc_value_index = j;
                                break;
                        }
                }
        }

        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 there was nothing to process, don't send an empty sync */
        if (wacom_wac->hid_data.num_expected == 0)
                return;

        /* 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;
        struct wacom_features *features = &wacom_wac->features;

        if (WACOM_DIRECT_DEVICE(field))
                features->device_type |= WACOM_DEVICETYPE_DIRECT;

        /* usage tests must precede field tests */
        if (WACOM_BATTERY_USAGE(usage))
                wacom_wac_battery_usage_mapping(hdev, field, usage);
        else if (WACOM_PAD_FIELD(field))
                wacom_wac_pad_usage_mapping(hdev, field, usage);
        else if (WACOM_PEN_FIELD(field))
                wacom_wac_pen_usage_mapping(hdev, field, usage);
        else if (WACOM_FINGER_FIELD(field))
                wacom_wac_finger_usage_mapping(hdev, field, usage);
}

void 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;

        if (value > field->logical_maximum || value < field->logical_minimum)
                return;

        /* usage tests must precede field tests */
        if (WACOM_BATTERY_USAGE(usage))
                wacom_wac_battery_event(hdev, field, usage, value);
        else if (WACOM_PAD_FIELD(field) && wacom->wacom_wac.pad_input)
                wacom_wac_pad_event(hdev, field, usage, value);
        else if (WACOM_PEN_FIELD(field) && wacom->wacom_wac.pen_input)
                wacom_wac_pen_event(hdev, field, usage, value);
        else if (WACOM_FINGER_FIELD(field) && wacom->wacom_wac.touch_input)
                wacom_wac_finger_event(hdev, field, usage, value);
}

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

        for (r = field_index; 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++) {
                        if (field->usage[n].collection_index == collection_index)
                                wacom_wac_event(hdev, field, &field->usage[n],
                                                field->value[n]);
                        else
                                return;
                }
        }
}

static int wacom_wac_collection(struct hid_device *hdev, struct hid_report *report,
                         int collection_index, struct hid_field *field,
                         int field_index)
{
        struct wacom *wacom = hid_get_drvdata(hdev);

        wacom_report_events(hdev, report, collection_index, field_index);

        /*
         * Non-input reports may be sent prior to the device being
         * completely initialized. Since only their events need
         * to be processed, exit after 'wacom_report_events' has
         * been called to prevent potential crashes in the report-
         * processing functions.
         */
        if (report->type != HID_INPUT_REPORT)
                return -1;

        if (WACOM_PAD_FIELD(field))
                return 0;
        else if (WACOM_PEN_FIELD(field) && wacom->wacom_wac.pen_input)
                wacom_wac_pen_report(hdev, report);
        else if (WACOM_FINGER_FIELD(field) && wacom->wacom_wac.touch_input)
                wacom_wac_finger_report(hdev, report);

        return 0;
}

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;
        bool pad_in_hid_field = false, pen_in_hid_field = false,
                finger_in_hid_field = false, true_pad = false;
        int r;
        int prev_collection = -1;

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

        for (r = 0; r < report->maxfield; r++) {
                field = report->field[r];

                if (WACOM_PAD_FIELD(field))
                        pad_in_hid_field = true;
                if (WACOM_PEN_FIELD(field))
                        pen_in_hid_field = true;
                if (WACOM_FINGER_FIELD(field))
                        finger_in_hid_field = true;
                if (wacom_equivalent_usage(field->physical) == HID_DG_TABLETFUNCTIONKEY)
                        true_pad = true;
        }

        wacom_wac_battery_pre_report(hdev, report);

        if (pad_in_hid_field && wacom->wacom_wac.pad_input)
                wacom_wac_pad_pre_report(hdev, report);
        if (pen_in_hid_field && wacom->wacom_wac.pen_input)
                wacom_wac_pen_pre_report(hdev, report);
        if (finger_in_hid_field && wacom->wacom_wac.touch_input)
                wacom_wac_finger_pre_report(hdev, report);

        for (r = 0; r < report->maxfield; r++) {
                field = report->field[r];

                if (field->usage[0].collection_index != prev_collection) {
                        if (wacom_wac_collection(hdev, report,
                                field->usage[0].collection_index, field, r) < 0)
                                return;
                        prev_collection = field->usage[0].collection_index;
                }
        }

        wacom_wac_battery_report(hdev, report);

        if (true_pad && wacom->wacom_wac.pad_input)
                wacom_wac_pad_report(hdev, report, field);
}

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 = report_touch_events(wacom)
                           && (data[offset + 3] & 0x80);

                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 && report_touch_events(wacom);

        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_input && touch_changed) {
                input_mt_sync_frame(wacom->touch_input);
                wacom->shared->touch_down = wacom_wac_finger_count_touches(wacom);