// SPDX-License-Identifier: GPL-2.0-or-later
/******************************************************************************
 * usbtouchscreen.c
 * Driver for USB Touchscreens, supporting those devices:
 *  - eGalax Touchkit
 *    includes eTurboTouch CT-410/510/700
 *  - 3M/Microtouch  EX II series
 *  - ITM
 *  - PanJit TouchSet
 *  - eTurboTouch
 *  - Gunze AHL61
 *  - DMC TSC-10/25
 *  - IRTOUCHSYSTEMS/UNITOP
 *  - IdealTEK URTC1000
 *  - General Touch
 *  - GoTop Super_Q2/GogoPen/PenPower tablets
 *  - JASTEC USB touch controller/DigiTech DTR-02U
 *  - Zytronic capacitive touchscreen
 *  - NEXIO/iNexio
 *  - Elo TouchSystems 2700 IntelliTouch
 *  - EasyTouch USB Dual/Multi touch controller from Data Modul
 *
 * Copyright (C) 2004-2007 by Daniel Ritz <daniel.ritz@gmx.ch>
 * Copyright (C) by Todd E. Johnson (mtouchusb.c)
 *
 * Driver is based on touchkitusb.c
 * - ITM parts are from itmtouch.c
 * - 3M parts are from mtouchusb.c
 * - PanJit parts are from an unmerged driver by Lanslott Gish
 * - DMC TSC 10/25 are from Holger Schurig, with ideas from an unmerged
 *   driver from Marius Vollmer
 *
 *****************************************************************************/

//#define DEBUG

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/usb/input.h>
#include <linux/hid.h>
#include <linux/mutex.h>

static bool swap_xy;
module_param(swap_xy, bool, 0644);
MODULE_PARM_DESC(swap_xy, "If set X and Y axes are swapped.");

static bool hwcalib_xy;
module_param(hwcalib_xy, bool, 0644);
MODULE_PARM_DESC(hwcalib_xy, "If set hw-calibrated X/Y are used if available");

/* device specifc data/functions */
struct usbtouch_usb;
struct usbtouch_device_info {
        int min_xc, max_xc;
        int min_yc, max_yc;
        int min_press, max_press;
        int rept_size;

        /*
         * Always service the USB devices irq not just when the input device is
         * open. This is useful when devices have a watchdog which prevents us
         * from periodically polling the device. Leave this unset unless your
         * touchscreen device requires it, as it does consume more of the USB
         * bandwidth.
         */
        bool irq_always;

        /*
         * used to get the packet len. possible return values:
         * > 0: packet len
         * = 0: skip one byte
         * < 0: -return value more bytes needed
         */
        int  (*get_pkt_len) (unsigned char *pkt, int len);

        int  (*read_data)   (struct usbtouch_usb *usbtouch, unsigned char *pkt);
        int  (*alloc)       (struct usbtouch_usb *usbtouch);
        int  (*init)        (struct usbtouch_usb *usbtouch);
        void (*exit)        (struct usbtouch_usb *usbtouch);
};

/* a usbtouch device */
struct usbtouch_usb {
        unsigned char *data;
        dma_addr_t data_dma;
        int data_size;
        unsigned char *buffer;
        int buf_len;
        struct urb *irq;
        struct usb_interface *interface;
        struct input_dev *input;
        const struct usbtouch_device_info *type;
        struct mutex pm_mutex;  /* serialize access to open/suspend */
        bool is_open;
        char name[128];
        char phys[64];
        void *priv;

        int x, y;
        int touch, press;

        void (*process_pkt)(struct usbtouch_usb *usbtouch, unsigned char *pkt, int len);
};


/*****************************************************************************
 * e2i Part
 */

#ifdef CONFIG_TOUCHSCREEN_USB_E2I
static int e2i_init(struct usbtouch_usb *usbtouch)
{
        int ret;
        struct usb_device *udev = interface_to_usbdev(usbtouch->interface);

        ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
                              0x01, 0x02, 0x0000, 0x0081,
                              NULL, 0, USB_CTRL_SET_TIMEOUT);

        dev_dbg(&usbtouch->interface->dev,
                "%s - usb_control_msg - E2I_RESET - bytes|err: %d\n",
                __func__, ret);
        return ret;
}

static int e2i_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
        int tmp = (pkt[0] << 8) | pkt[1];
        dev->x  = (pkt[2] << 8) | pkt[3];
        dev->y  = (pkt[4] << 8) | pkt[5];

        tmp = tmp - 0xA000;
        dev->touch = (tmp > 0);
        dev->press = (tmp > 0 ? tmp : 0);

        return 1;
}

static const struct usbtouch_device_info e2i_dev_info = {
        .min_xc         = 0x0,
        .max_xc         = 0x7fff,
        .min_yc         = 0x0,
        .max_yc         = 0x7fff,
        .rept_size      = 6,
        .init           = e2i_init,
        .read_data      = e2i_read_data,
};
#endif


/*****************************************************************************
 * eGalax part
 */

#ifdef CONFIG_TOUCHSCREEN_USB_EGALAX

#ifndef MULTI_PACKET
#define MULTI_PACKET
#endif

#define EGALAX_PKT_TYPE_MASK            0xFE
#define EGALAX_PKT_TYPE_REPT            0x80
#define EGALAX_PKT_TYPE_DIAG            0x0A

static int egalax_init(struct usbtouch_usb *usbtouch)
{
        struct usb_device *udev = interface_to_usbdev(usbtouch->interface);
        int ret, i;

        /*
         * An eGalax diagnostic packet kicks the device into using the right
         * protocol.  We send a "check active" packet.  The response will be
         * read later and ignored.
         */

        u8 *buf __free(kfree) = kmalloc(3, GFP_KERNEL);
        if (!buf)
                return -ENOMEM;

        buf[0] = EGALAX_PKT_TYPE_DIAG;
        buf[1] = 1;     /* length */
        buf[2] = 'A';   /* command - check active */

        for (i = 0; i < 3; i++) {
                ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
                                      0,
                                      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                                      0, 0, buf, 3,
                                      USB_CTRL_SET_TIMEOUT);
                if (ret != -EPIPE)
                        break;
        }

        return ret < 0 ? ret : 0;
}

static int egalax_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
        if ((pkt[0] & EGALAX_PKT_TYPE_MASK) != EGALAX_PKT_TYPE_REPT)
                return 0;

        dev->x = ((pkt[3] & 0x0F) << 7) | (pkt[4] & 0x7F);
        dev->y = ((pkt[1] & 0x0F) << 7) | (pkt[2] & 0x7F);
        dev->touch = pkt[0] & 0x01;

        return 1;
}

static int egalax_get_pkt_len(unsigned char *buf, int len)
{
        switch (buf[0] & EGALAX_PKT_TYPE_MASK) {
        case EGALAX_PKT_TYPE_REPT:
                return 5;

        case EGALAX_PKT_TYPE_DIAG:
                if (len < 2)
                        return -1;

                return buf[1] + 2;
        }

        return 0;
}

static const struct usbtouch_device_info egalax_dev_info = {
        .min_xc         = 0x0,
        .max_xc         = 0x07ff,
        .min_yc         = 0x0,
        .max_yc         = 0x07ff,
        .rept_size      = 16,
        .get_pkt_len    = egalax_get_pkt_len,
        .read_data      = egalax_read_data,
        .init           = egalax_init,
};
#endif

/*****************************************************************************
 * EasyTouch part
 */

#ifdef CONFIG_TOUCHSCREEN_USB_EASYTOUCH

#ifndef MULTI_PACKET
#define MULTI_PACKET
#endif

#define ETOUCH_PKT_TYPE_MASK            0xFE
#define ETOUCH_PKT_TYPE_REPT            0x80
#define ETOUCH_PKT_TYPE_REPT2           0xB0
#define ETOUCH_PKT_TYPE_DIAG            0x0A

static int etouch_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
        if ((pkt[0] & ETOUCH_PKT_TYPE_MASK) != ETOUCH_PKT_TYPE_REPT &&
                (pkt[0] & ETOUCH_PKT_TYPE_MASK) != ETOUCH_PKT_TYPE_REPT2)
                return 0;

        dev->x = ((pkt[1] & 0x1F) << 7) | (pkt[2] & 0x7F);
        dev->y = ((pkt[3] & 0x1F) << 7) | (pkt[4] & 0x7F);
        dev->touch = pkt[0] & 0x01;

        return 1;
}

static int etouch_get_pkt_len(unsigned char *buf, int len)
{
        switch (buf[0] & ETOUCH_PKT_TYPE_MASK) {
        case ETOUCH_PKT_TYPE_REPT:
        case ETOUCH_PKT_TYPE_REPT2:
                return 5;

        case ETOUCH_PKT_TYPE_DIAG:
                if (len < 2)
                        return -1;

                return buf[1] + 2;
        }

        return 0;
}

static const struct usbtouch_device_info etouch_dev_info = {
        .min_xc         = 0x0,
        .max_xc         = 0x07ff,
        .min_yc         = 0x0,
        .max_yc         = 0x07ff,
        .rept_size      = 16,
        .get_pkt_len    = etouch_get_pkt_len,
        .read_data      = etouch_read_data,
};
#endif

/*****************************************************************************
 * PanJit Part
 */
#ifdef CONFIG_TOUCHSCREEN_USB_PANJIT
static int panjit_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
        dev->x = ((pkt[2] & 0x0F) << 8) | pkt[1];
        dev->y = ((pkt[4] & 0x0F) << 8) | pkt[3];
        dev->touch = pkt[0] & 0x01;

        return 1;
}

static const struct usbtouch_device_info panjit_dev_info = {
        .min_xc         = 0x0,
        .max_xc         = 0x0fff,
        .min_yc         = 0x0,
        .max_yc         = 0x0fff,
        .rept_size      = 8,
        .read_data      = panjit_read_data,
};
#endif


/*****************************************************************************
 * 3M/Microtouch Part
 */
#ifdef CONFIG_TOUCHSCREEN_USB_3M

#define MTOUCHUSB_ASYNC_REPORT          1
#define MTOUCHUSB_RESET                 7
#define MTOUCHUSB_REQ_CTRLLR_ID         10

#define MTOUCHUSB_REQ_CTRLLR_ID_LEN     16

static int mtouch_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
        if (hwcalib_xy) {
                dev->x = (pkt[4] << 8) | pkt[3];
                dev->y = 0xffff - ((pkt[6] << 8) | pkt[5]);
        } else {
                dev->x = (pkt[8] << 8) | pkt[7];
                dev->y = (pkt[10] << 8) | pkt[9];
        }
        dev->touch = (pkt[2] & 0x40) ? 1 : 0;

        return 1;
}

struct mtouch_priv {
        u8 fw_rev_major;
        u8 fw_rev_minor;
};

static int mtouch_get_fw_revision(struct usbtouch_usb *usbtouch)
{
        struct usb_device *udev = interface_to_usbdev(usbtouch->interface);
        struct mtouch_priv *priv = usbtouch->priv;
        int ret;

        u8 *buf __free(kfree) = kzalloc(MTOUCHUSB_REQ_CTRLLR_ID_LEN, GFP_NOIO);
        if (!buf)
                return -ENOMEM;

        ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
                              MTOUCHUSB_REQ_CTRLLR_ID,
                              USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                              0, 0, buf, MTOUCHUSB_REQ_CTRLLR_ID_LEN,
                              USB_CTRL_SET_TIMEOUT);
        if (ret != MTOUCHUSB_REQ_CTRLLR_ID_LEN) {
                dev_warn(&usbtouch->interface->dev,
                         "Failed to read FW rev: %d\n", ret);
                return ret < 0 ? ret : -EIO;
        }

        priv->fw_rev_major = buf[3];
        priv->fw_rev_minor = buf[4];

        return 0;
}

static int mtouch_alloc(struct usbtouch_usb *usbtouch)
{
        struct mtouch_priv *priv;

        priv = kmalloc_obj(*priv);
        if (!priv)
                return -ENOMEM;

        usbtouch->priv = priv;
        return 0;
}

static int mtouch_init(struct usbtouch_usb *usbtouch)
{
        int ret, i;
        struct usb_device *udev = interface_to_usbdev(usbtouch->interface);

        ret = mtouch_get_fw_revision(usbtouch);
        if (ret)
                return ret;

        ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
                              MTOUCHUSB_RESET,
                              USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                              1, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
        dev_dbg(&usbtouch->interface->dev,
                "%s - usb_control_msg - MTOUCHUSB_RESET - bytes|err: %d\n",
                __func__, ret);
        if (ret < 0)
                return ret;
        msleep(150);

        for (i = 0; i < 3; i++) {
                ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
                                      MTOUCHUSB_ASYNC_REPORT,
                                      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                                      1, 1, NULL, 0, USB_CTRL_SET_TIMEOUT);
                dev_dbg(&usbtouch->interface->dev,
                        "%s - usb_control_msg - MTOUCHUSB_ASYNC_REPORT - bytes|err: %d\n",
                        __func__, ret);
                if (ret >= 0)
                        break;
                if (ret != -EPIPE)
                        return ret;
        }

        /* Default min/max xy are the raw values, override if using hw-calib */
        if (hwcalib_xy) {
                input_set_abs_params(usbtouch->input, ABS_X, 0, 0xffff, 0, 0);
                input_set_abs_params(usbtouch->input, ABS_Y, 0, 0xffff, 0, 0);
        }

        return 0;
}

static void mtouch_exit(struct usbtouch_usb *usbtouch)
{
        struct mtouch_priv *priv = usbtouch->priv;

        kfree(priv);
}

static struct usbtouch_device_info mtouch_dev_info = {
        .min_xc         = 0x0,
        .max_xc         = 0x4000,
        .min_yc         = 0x0,
        .max_yc         = 0x4000,
        .rept_size      = 11,
        .read_data      = mtouch_read_data,
        .alloc          = mtouch_alloc,
        .init           = mtouch_init,
        .exit           = mtouch_exit,
};

static ssize_t mtouch_firmware_rev_show(struct device *dev,
                                struct device_attribute *attr, char *output)
{
        struct usb_interface *intf = to_usb_interface(dev);
        struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);
        struct mtouch_priv *priv = usbtouch->priv;

        return sysfs_emit(output, "%1x.%1x\n",
                          priv->fw_rev_major, priv->fw_rev_minor);
}
static DEVICE_ATTR(firmware_rev, 0444, mtouch_firmware_rev_show, NULL);

static struct attribute *mtouch_attrs[] = {
        &dev_attr_firmware_rev.attr,
        NULL
};

static bool mtouch_group_visible(struct kobject *kobj)
{
        struct device *dev = kobj_to_dev(kobj);
        struct usb_interface *intf = to_usb_interface(dev);
        struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);

        return usbtouch->type == &mtouch_dev_info;
}

DEFINE_SIMPLE_SYSFS_GROUP_VISIBLE(mtouch);

static const struct attribute_group mtouch_attr_group = {
        .is_visible = SYSFS_GROUP_VISIBLE(mtouch),
        .attrs = mtouch_attrs,
};
#endif


/*****************************************************************************
 * ITM Part
 */
#ifdef CONFIG_TOUCHSCREEN_USB_ITM
static int itm_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
        int touch;
        /*
         * ITM devices report invalid x/y data if not touched.
         * if the screen was touched before but is not touched any more
         * report touch as 0 with the last valid x/y data once. then stop
         * reporting data until touched again.
         */
        dev->press = ((pkt[2] & 0x01) << 7) | (pkt[5] & 0x7F);

        touch = ~pkt[7] & 0x20;
        if (!touch) {
                if (dev->touch) {
                        dev->touch = 0;
                        return 1;
                }

                return 0;
        }

        dev->x = ((pkt[0] & 0x1F) << 7) | (pkt[3] & 0x7F);
        dev->y = ((pkt[1] & 0x1F) << 7) | (pkt[4] & 0x7F);
        dev->touch = touch;

        return 1;
}

static const struct usbtouch_device_info itm_dev_info = {
        .min_xc         = 0x0,
        .max_xc         = 0x0fff,
        .min_yc         = 0x0,
        .max_yc         = 0x0fff,
        .max_press      = 0xff,
        .rept_size      = 8,
        .read_data      = itm_read_data,
};
#endif


/*****************************************************************************
 * eTurboTouch part
 */
#ifdef CONFIG_TOUCHSCREEN_USB_ETURBO
#ifndef MULTI_PACKET
#define MULTI_PACKET
#endif
static int eturbo_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
        unsigned int shift;

        /* packets should start with sync */
        if (!(pkt[0] & 0x80))
                return 0;

        shift = (6 - (pkt[0] & 0x03));
        dev->x = ((pkt[3] << 7) | pkt[4]) >> shift;
        dev->y = ((pkt[1] << 7) | pkt[2]) >> shift;
        dev->touch = (pkt[0] & 0x10) ? 1 : 0;

        return 1;
}

static int eturbo_get_pkt_len(unsigned char *buf, int len)
{
        if (buf[0] & 0x80)
                return 5;
        if (buf[0] == 0x01)
                return 3;
        return 0;
}

static const struct usbtouch_device_info eturbo_dev_info = {
        .min_xc         = 0x0,
        .max_xc         = 0x07ff,
        .min_yc         = 0x0,
        .max_yc         = 0x07ff,
        .rept_size      = 8,
        .get_pkt_len    = eturbo_get_pkt_len,
        .read_data      = eturbo_read_data,
};
#endif


/*****************************************************************************
 * Gunze part
 */
#ifdef CONFIG_TOUCHSCREEN_USB_GUNZE
static int gunze_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
        if (!(pkt[0] & 0x80) || ((pkt[1] | pkt[2] | pkt[3]) & 0x80))
                return 0;

        dev->x = ((pkt[0] & 0x1F) << 7) | (pkt[2] & 0x7F);
        dev->y = ((pkt[1] & 0x1F) << 7) | (pkt[3] & 0x7F);
        dev->touch = pkt[0] & 0x20;

        return 1;
}

static const struct usbtouch_device_info gunze_dev_info = {
        .min_xc         = 0x0,
        .max_xc         = 0x0fff,
        .min_yc         = 0x0,
        .max_yc         = 0x0fff,
        .rept_size      = 4,
        .read_data      = gunze_read_data,
};
#endif

/*****************************************************************************
 * DMC TSC-10/25 Part
 *
 * Documentation about the controller and it's protocol can be found at
 *   http://www.dmccoltd.com/files/controler/tsc10usb_pi_e.pdf
 *   http://www.dmccoltd.com/files/controler/tsc25_usb_e.pdf
 */
#ifdef CONFIG_TOUCHSCREEN_USB_DMC_TSC10

/* supported data rates. currently using 130 */
#define TSC10_RATE_POINT        0x50
#define TSC10_RATE_30           0x40
#define TSC10_RATE_50           0x41
#define TSC10_RATE_80           0x42
#define TSC10_RATE_100          0x43
#define TSC10_RATE_130          0x44
#define TSC10_RATE_150          0x45

/* commands */
#define TSC10_CMD_RESET         0x55
#define TSC10_CMD_RATE          0x05
#define TSC10_CMD_DATA1         0x01

static int dmc_tsc10_init(struct usbtouch_usb *usbtouch)
{
        struct usb_device *dev = interface_to_usbdev(usbtouch->interface);
        int ret;

        u8 *buf __free(kfree) = kmalloc(2, GFP_NOIO);
        if (!buf)
                return -ENOMEM;

        /* reset */
        buf[0] = buf[1] = 0xFF;
        ret = usb_control_msg(dev, usb_rcvctrlpipe (dev, 0),
                              TSC10_CMD_RESET,
                              USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                              0, 0, buf, 2, USB_CTRL_SET_TIMEOUT);
        if (ret < 0)
                return ret;

        if (buf[0] != 0x06)
                return -ENODEV;

        /* TSC-25 data sheet specifies a delay after the RESET command */
        msleep(150);

        /* set coordinate output rate */
        buf[0] = buf[1] = 0xFF;
        ret = usb_control_msg(dev, usb_rcvctrlpipe (dev, 0),
                              TSC10_CMD_RATE,
                              USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                              TSC10_RATE_150, 0, buf, 2, USB_CTRL_SET_TIMEOUT);
        if (ret < 0)
                return ret;

        if (buf[0] != 0x06 && (buf[0] != 0x15 || buf[1] != 0x01))
                return -ENODEV;

        /* start sending data */
        return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
                               TSC10_CMD_DATA1,
                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                               0, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
}

static int dmc_tsc10_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
        dev->x = ((pkt[2] & 0x03) << 8) | pkt[1];
        dev->y = ((pkt[4] & 0x03) << 8) | pkt[3];
        dev->touch = pkt[0] & 0x01;

        return 1;
}

static const struct usbtouch_device_info dmc_tsc10_dev_info = {
        .min_xc         = 0x0,
        .max_xc         = 0x03ff,
        .min_yc         = 0x0,
        .max_yc         = 0x03ff,
        .rept_size      = 5,
        .init           = dmc_tsc10_init,
        .read_data      = dmc_tsc10_read_data,
};
#endif


/*****************************************************************************
 * IRTOUCH Part
 */
#ifdef CONFIG_TOUCHSCREEN_USB_IRTOUCH
static int irtouch_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
        dev->x = (pkt[3] << 8) | pkt[2];
        dev->y = (pkt[5] << 8) | pkt[4];
        dev->touch = (pkt[1] & 0x03) ? 1 : 0;

        return 1;
}

static const struct usbtouch_device_info irtouch_dev_info = {
        .min_xc         = 0x0,
        .max_xc         = 0x0fff,
        .min_yc         = 0x0,
        .max_yc         = 0x0fff,
        .rept_size      = 8,
        .read_data      = irtouch_read_data,
};

static const struct usbtouch_device_info irtouch_hires_dev_info = {
        .min_xc         = 0x0,
        .max_xc         = 0x7fff,
        .min_yc         = 0x0,
        .max_yc         = 0x7fff,
        .rept_size      = 8,
        .read_data      = irtouch_read_data,
};
#endif

/*****************************************************************************
 * ET&T TC5UH/TC4UM part
 */
#ifdef CONFIG_TOUCHSCREEN_USB_ETT_TC45USB
static int tc45usb_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
        dev->x = ((pkt[2] & 0x0F) << 8) | pkt[1];
        dev->y = ((pkt[4] & 0x0F) << 8) | pkt[3];
        dev->touch = pkt[0] & 0x01;

        return 1;
}

static const struct usbtouch_device_info tc45usb_dev_info = {
        .min_xc         = 0x0,
        .max_xc         = 0x0fff,
        .min_yc         = 0x0,
        .max_yc         = 0x0fff,
        .rept_size      = 5,
        .read_data      = tc45usb_read_data,
};
#endif

/*****************************************************************************
 * IdealTEK URTC1000 Part
 */
#ifdef CONFIG_TOUCHSCREEN_USB_IDEALTEK
#ifndef MULTI_PACKET
#define MULTI_PACKET
#endif
static int idealtek_get_pkt_len(unsigned char *buf, int len)
{
        if (buf[0] & 0x80)
                return 5;
        if (buf[0] == 0x01)
                return len;
        return 0;
}

static int idealtek_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
        switch (pkt[0] & 0x98) {
        case 0x88:
                /* touch data in IdealTEK mode */
                dev->x = (pkt[1] << 5) | (pkt[2] >> 2);
                dev->y = (pkt[3] << 5) | (pkt[4] >> 2);
                dev->touch = (pkt[0] & 0x40) ? 1 : 0;
                return 1;

        case 0x98:
                /* touch data in MT emulation mode */
                dev->x = (pkt[2] << 5) | (pkt[1] >> 2);
                dev->y = (pkt[4] << 5) | (pkt[3] >> 2);
                dev->touch = (pkt[0] & 0x40) ? 1 : 0;
                return 1;

        default:
                return 0;
        }
}

static const struct usbtouch_device_info idealtek_dev_info = {
        .min_xc         = 0x0,
        .max_xc         = 0x0fff,
        .min_yc         = 0x0,
        .max_yc         = 0x0fff,
        .rept_size      = 8,
        .get_pkt_len    = idealtek_get_pkt_len,
        .read_data      = idealtek_read_data,
};
#endif

/*****************************************************************************
 * General Touch Part
 */
#ifdef CONFIG_TOUCHSCREEN_USB_GENERAL_TOUCH
static int general_touch_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
        dev->x = (pkt[2] << 8) | pkt[1];
        dev->y = (pkt[4] << 8) | pkt[3];
        dev->press = pkt[5] & 0xff;
        dev->touch = pkt[0] & 0x01;

        return 1;
}

static const struct usbtouch_device_info general_touch_dev_info = {
        .min_xc         = 0x0,
        .max_xc         = 0x7fff,
        .min_yc         = 0x0,
        .max_yc         = 0x7fff,
        .rept_size      = 7,
        .read_data      = general_touch_read_data,
};
#endif

/*****************************************************************************
 * GoTop Part
 */
#ifdef CONFIG_TOUCHSCREEN_USB_GOTOP
static int gotop_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
        dev->x = ((pkt[1] & 0x38) << 4) | pkt[2];
        dev->y = ((pkt[1] & 0x07) << 7) | pkt[3];
        dev->touch = pkt[0] & 0x01;

        return 1;
}

static const struct usbtouch_device_info gotop_dev_info = {
        .min_xc         = 0x0,
        .max_xc         = 0x03ff,
        .min_yc         = 0x0,
        .max_yc         = 0x03ff,
        .rept_size      = 4,
        .read_data      = gotop_read_data,
};
#endif

/*****************************************************************************
 * JASTEC Part
 */
#ifdef CONFIG_TOUCHSCREEN_USB_JASTEC
static int jastec_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
        dev->x = ((pkt[0] & 0x3f) << 6) | (pkt[2] & 0x3f);
        dev->y = ((pkt[1] & 0x3f) << 6) | (pkt[3] & 0x3f);
        dev->touch = (pkt[0] & 0x40) >> 6;

        return 1;
}

static const struct usbtouch_device_info jastec_dev_info = {
        .min_xc         = 0x0,
        .max_xc         = 0x0fff,
        .min_yc         = 0x0,
        .max_yc         = 0x0fff,
        .rept_size      = 4,
        .read_data      = jastec_read_data,
};
#endif

/*****************************************************************************
 * Zytronic Part
 */
#ifdef CONFIG_TOUCHSCREEN_USB_ZYTRONIC
static int zytronic_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
        struct usb_interface *intf = dev->interface;

        switch (pkt[0]) {
        case 0x3A: /* command response */
                dev_dbg(&intf->dev, "%s: Command response %d\n", __func__, pkt[1]);
                break;

        case 0xC0: /* down */
                dev->x = (pkt[1] & 0x7f) | ((pkt[2] & 0x07) << 7);
                dev->y = (pkt[3] & 0x7f) | ((pkt[4] & 0x07) << 7);
                dev->touch = 1;
                dev_dbg(&intf->dev, "%s: down %d,%d\n", __func__, dev->x, dev->y);
                return 1;

        case 0x80: /* up */
                dev->x = (pkt[1] & 0x7f) | ((pkt[2] & 0x07) << 7);
                dev->y = (pkt[3] & 0x7f) | ((pkt[4] & 0x07) << 7);
                dev->touch = 0;
                dev_dbg(&intf->dev, "%s: up %d,%d\n", __func__, dev->x, dev->y);
                return 1;

        default:
                dev_dbg(&intf->dev, "%s: Unknown return %d\n", __func__, pkt[0]);
                break;
        }

        return 0;
}

static const struct usbtouch_device_info zytronic_dev_info = {
        .min_xc         = 0x0,
        .max_xc         = 0x03ff,
        .min_yc         = 0x0,
        .max_yc         = 0x03ff,
        .rept_size      = 5,
        .read_data      = zytronic_read_data,
        .irq_always     = true,
};
#endif

/*****************************************************************************
 * NEXIO Part
 */
#ifdef CONFIG_TOUCHSCREEN_USB_NEXIO

#define NEXIO_TIMEOUT   5000
#define NEXIO_BUFSIZE   1024
#define NEXIO_THRESHOLD 50

struct nexio_priv {
        struct urb *ack;
        unsigned char *ack_buf;
};

struct nexio_touch_packet {
        u8      flags;          /* 0xe1 = touch, 0xe1 = release */
        __be16  data_len;       /* total bytes of touch data */
        __be16  x_len;          /* bytes for X axis */
        __be16  y_len;          /* bytes for Y axis */
        u8      data[];
} __attribute__ ((packed));

static unsigned char nexio_ack_pkt[2] = { 0xaa, 0x02 };
static unsigned char nexio_init_pkt[4] = { 0x82, 0x04, 0x0a, 0x0f };

static void nexio_ack_complete(struct urb *urb)
{
}

static int nexio_alloc(struct usbtouch_usb *usbtouch)
{
        struct nexio_priv *priv;
        int ret = -ENOMEM;

        priv = kmalloc_obj(*priv);
        if (!priv)
                goto out_buf;

        usbtouch->priv = priv;
        priv->ack_buf = kmemdup(nexio_ack_pkt, sizeof(nexio_ack_pkt),
                                GFP_KERNEL);
        if (!priv->ack_buf)
                goto err_priv;

        priv->ack = usb_alloc_urb(0, GFP_KERNEL);
        if (!priv->ack) {
                dev_dbg(&usbtouch->interface->dev,
                        "%s - usb_alloc_urb failed: usbtouch->ack\n", __func__);
                goto err_ack_buf;
        }

        return 0;

err_ack_buf:
        kfree(priv->ack_buf);
err_priv:
        kfree(priv);
out_buf:
        return ret;
}

static int nexio_init(struct usbtouch_usb *usbtouch)
{
        struct usb_device *dev = interface_to_usbdev(usbtouch->interface);
        struct usb_host_interface *interface = usbtouch->interface->cur_altsetting;
        struct nexio_priv *priv = usbtouch->priv;
        int ret = -ENOMEM;
        int actual_len, i;
        char *firmware_ver = NULL, *device_name = NULL;
        int input_ep = 0, output_ep = 0;

        /* find first input and output endpoint */
        for (i = 0; i < interface->desc.bNumEndpoints; i++) {
                if (!input_ep &&
                    usb_endpoint_dir_in(&interface->endpoint[i].desc))
                        input_ep = interface->endpoint[i].desc.bEndpointAddress;
                if (!output_ep &&
                    usb_endpoint_dir_out(&interface->endpoint[i].desc))
                        output_ep = interface->endpoint[i].desc.bEndpointAddress;
        }
        if (!input_ep || !output_ep)
                return -ENXIO;

        u8 *buf __free(kfree) = kmalloc(NEXIO_BUFSIZE, GFP_NOIO);
        if (!buf)
                return -ENOMEM;

        /* two empty reads */
        for (i = 0; i < 2; i++) {
                ret = usb_bulk_msg(dev, usb_rcvbulkpipe(dev, input_ep),
                                   buf, NEXIO_BUFSIZE, &actual_len,
                                   NEXIO_TIMEOUT);
                if (ret < 0)
                        return ret;
        }

        /* send init command */
        memcpy(buf, nexio_init_pkt, sizeof(nexio_init_pkt));
        ret = usb_bulk_msg(dev, usb_sndbulkpipe(dev, output_ep),
                           buf, sizeof(nexio_init_pkt), &actual_len,
                           NEXIO_TIMEOUT);
        if (ret < 0)
                return ret;

        /* read replies */
        for (i = 0; i < 3; i++) {
                memset(buf, 0, NEXIO_BUFSIZE);
                ret = usb_bulk_msg(dev, usb_rcvbulkpipe(dev, input_ep),
                                   buf, NEXIO_BUFSIZE, &actual_len,
                                   NEXIO_TIMEOUT);
                if (ret < 0 || actual_len < 1 || buf[1] != actual_len)
                        continue;
                switch (buf[0]) {
                case 0x83:      /* firmware version */
                        if (!firmware_ver)
                                firmware_ver = kstrdup(&buf[2], GFP_NOIO);
                        break;
                case 0x84:      /* device name */
                        if (!device_name)
                                device_name = kstrdup(&buf[2], GFP_NOIO);
                        break;
                }
        }

        printk(KERN_INFO "Nexio device: %s, firmware version: %s\n",
               device_name, firmware_ver);

        kfree(firmware_ver);
        kfree(device_name);

        usb_fill_bulk_urb(priv->ack, dev, usb_sndbulkpipe(dev, output_ep),
                          priv->ack_buf, sizeof(nexio_ack_pkt),
                          nexio_ack_complete, usbtouch);

        return 0;
}

static void nexio_exit(struct usbtouch_usb *usbtouch)
{
        struct nexio_priv *priv = usbtouch->priv;

        usb_kill_urb(priv->ack);
        usb_free_urb(priv->ack);
        kfree(priv->ack_buf);
        kfree(priv);
}

static int nexio_read_data(struct usbtouch_usb *usbtouch, unsigned char *pkt)
{
        struct device *dev = &usbtouch->interface->dev;
        struct nexio_touch_packet *packet = (void *) pkt;
        struct nexio_priv *priv = usbtouch->priv;
        unsigned int data_len = be16_to_cpu(packet->data_len);
        unsigned int x_len = be16_to_cpu(packet->x_len);
        unsigned int y_len = be16_to_cpu(packet->y_len);
        int x, y, begin_x, begin_y, end_x, end_y, w, h, ret;

        /* got touch data? */
        if ((pkt[0] & 0xe0) != 0xe0)
                return 0;

        if (data_len > 0xff)
                data_len -= 0x100;
        if (x_len > 0xff)
                x_len -= 0x80;

        /* send ACK */
        ret = usb_submit_urb(priv->ack, GFP_ATOMIC);
        if (ret)
                dev_warn(dev, "Failed to submit ACK URB: %d\n", ret);

        if (!input_abs_get_max(usbtouch->input, ABS_X)) {
                input_set_abs_params(usbtouch->input, ABS_X,
                                     0, 2 * x_len, 0, 0);
                input_set_abs_params(usbtouch->input, ABS_Y,
                                     0, 2 * y_len, 0, 0);
        }
        /*
         * The device reports state of IR sensors on X and Y axes.
         * Each byte represents "darkness" percentage (0-100) of one element.
         * 17" touchscreen reports only 64 x 52 bytes so the resolution is low.
         * This also means that there's a limited multi-touch capability but
         * it's disabled (and untested) here as there's no X driver for that.
         */
        begin_x = end_x = begin_y = end_y = -1;
        for (x = 0; x < x_len; x++) {
                if (begin_x == -1 && packet->data[x] > NEXIO_THRESHOLD) {
                        begin_x = x;
                        continue;
                }
                if (end_x == -1 && begin_x != -1 && packet->data[x] < NEXIO_THRESHOLD) {
                        end_x = x - 1;
                        for (y = x_len; y < data_len; y++) {
                                if (begin_y == -1 && packet->data[y] > NEXIO_THRESHOLD) {
                                        begin_y = y - x_len;
                                        continue;
                                }
                                if (end_y == -1 &&
                                    begin_y != -1 && packet->data[y] < NEXIO_THRESHOLD) {
                                        end_y = y - 1 - x_len;
                                        w = end_x - begin_x;
                                        h = end_y - begin_y;
#if 0
                                        /* multi-touch */
                                        input_report_abs(usbtouch->input,
                                                    ABS_MT_TOUCH_MAJOR, max(w,h));
                                        input_report_abs(usbtouch->input,
                                                    ABS_MT_TOUCH_MINOR, min(x,h));
                                        input_report_abs(usbtouch->input,
                                                    ABS_MT_POSITION_X, 2*begin_x+w);
                                        input_report_abs(usbtouch->input,
                                                    ABS_MT_POSITION_Y, 2*begin_y+h);
                                        input_report_abs(usbtouch->input,
                                                    ABS_MT_ORIENTATION, w > h);
                                        input_mt_sync(usbtouch->input);
#endif
                                        /* single touch */
                                        usbtouch->x = 2 * begin_x + w;
                                        usbtouch->y = 2 * begin_y + h;
                                        usbtouch->touch = packet->flags & 0x01;
                                        begin_y = end_y = -1;
                                        return 1;
                                }
                        }
                        begin_x = end_x = -1;
                }

        }
        return 0;
}

static const struct usbtouch_device_info nexio_dev_info = {
        .rept_size      = 1024,
        .irq_always     = true,
        .read_data      = nexio_read_data,
        .alloc          = nexio_alloc,
        .init           = nexio_init,
        .exit           = nexio_exit,
};
#endif


/*****************************************************************************
 * ELO part
 */

#ifdef CONFIG_TOUCHSCREEN_USB_ELO

static int elo_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
        dev->x = (pkt[3] << 8) | pkt[2];
        dev->y = (pkt[5] << 8) | pkt[4];
        dev->touch = pkt[6] > 0;
        dev->press = pkt[6];

        return 1;
}

static const struct usbtouch_device_info elo_dev_info = {
        .min_xc         = 0x0,
        .max_xc         = 0x0fff,
        .min_yc         = 0x0,
        .max_yc         = 0x0fff,
        .max_press      = 0xff,
        .rept_size      = 8,
        .read_data      = elo_read_data,
};
#endif


/*****************************************************************************
 * Generic Part
 */
static void usbtouch_process_pkt(struct usbtouch_usb *usbtouch,
                                 unsigned char *pkt, int len)
{
        const struct usbtouch_device_info *type = usbtouch->type;

        if (!type->read_data(usbtouch, pkt))
                return;

        input_report_key(usbtouch->input, BTN_TOUCH, usbtouch->touch);

        if (swap_xy) {
                input_report_abs(usbtouch->input, ABS_X, usbtouch->y);
                input_report_abs(usbtouch->input, ABS_Y, usbtouch->x);
        } else {
                input_report_abs(usbtouch->input, ABS_X, usbtouch->x);
                input_report_abs(usbtouch->input, ABS_Y, usbtouch->y);
        }
        if (type->max_press)
                input_report_abs(usbtouch->input, ABS_PRESSURE, usbtouch->press);
        input_sync(usbtouch->input);
}


#ifdef MULTI_PACKET
static void usbtouch_process_multi(struct usbtouch_usb *usbtouch,
                                   unsigned char *pkt, int len)
{
        unsigned char *buffer;
        int pkt_len, pos, buf_len, tmp;

        /* process buffer */
        if (unlikely(usbtouch->buf_len)) {
                /* try to get size */
                pkt_len = usbtouch->type->get_pkt_len(
                                usbtouch->buffer, usbtouch->buf_len);

                /* drop? */
                if (unlikely(!pkt_len))
                        goto out_flush_buf;

                /* need to append -pkt_len bytes before able to get size */
                if (unlikely(pkt_len < 0)) {
                        int append = -pkt_len;
                        if (unlikely(append > len))
                               append = len;
                        if (usbtouch->buf_len + append >= usbtouch->type->rept_size)
                                goto out_flush_buf;
                        memcpy(usbtouch->buffer + usbtouch->buf_len, pkt, append);
                        usbtouch->buf_len += append;

                        pkt_len = usbtouch->type->get_pkt_len(
                                        usbtouch->buffer, usbtouch->buf_len);
                        if (pkt_len < 0)
                                return;
                }

                /* append */
                tmp = pkt_len - usbtouch->buf_len;
                if (usbtouch->buf_len + tmp >= usbtouch->type->rept_size)
                        goto out_flush_buf;
                memcpy(usbtouch->buffer + usbtouch->buf_len, pkt, tmp);
                usbtouch_process_pkt(usbtouch, usbtouch->buffer, pkt_len);

                buffer = pkt + tmp;
                buf_len = len - tmp;
        } else {
                buffer = pkt;
                buf_len = len;
        }

        /* loop over the received packet, process */
        pos = 0;
        while (pos < buf_len) {
                /* get packet len */
                pkt_len = usbtouch->type->get_pkt_len(buffer + pos,
                                                        buf_len - pos);

                /* unknown packet: skip one byte */
                if (unlikely(!pkt_len)) {
                        pos++;
                        continue;
                }

                /* full packet: process */
                if (likely((pkt_len > 0) && (pkt_len <= buf_len - pos))) {
                        usbtouch_process_pkt(usbtouch, buffer + pos, pkt_len);
                } else {
                        /* incomplete packet: save in buffer */
                        memcpy(usbtouch->buffer, buffer + pos, buf_len - pos);
                        usbtouch->buf_len = buf_len - pos;
                        return;
                }
                pos += pkt_len;
        }

out_flush_buf:
        usbtouch->buf_len = 0;
        return;
}
#else
static void usbtouch_process_multi(struct usbtouch_usb *usbtouch,
                                   unsigned char *pkt, int len)
{
        dev_WARN_ONCE(&usbtouch->interface->dev, 1,
                      "Protocol has ->get_pkt_len() without #define MULTI_PACKET");
}
#endif

static void usbtouch_irq(struct urb *urb)
{
        struct usbtouch_usb *usbtouch = urb->context;
        struct device *dev = &usbtouch->interface->dev;
        int retval;

        switch (urb->status) {
        case 0:
                /* success */
                break;
        case -ETIME:
                /* this urb is timing out */
                dev_dbg(dev,
                        "%s - urb timed out - was the device unplugged?\n",
                        __func__);
                return;
        case -ECONNRESET:
        case -ENOENT:
        case -ESHUTDOWN:
        case -EPIPE:
                /* this urb is terminated, clean up */
                dev_dbg(dev, "%s - urb shutting down with status: %d\n",
                        __func__, urb->status);
                return;
        default:
                dev_dbg(dev, "%s - nonzero urb status received: %d\n",
                        __func__, urb->status);
                goto exit;
        }

        usbtouch->process_pkt(usbtouch, usbtouch->data, urb->actual_length);

exit:
        usb_mark_last_busy(interface_to_usbdev(usbtouch->interface));
        retval = usb_submit_urb(urb, GFP_ATOMIC);
        if (retval)
                dev_err(dev, "%s - usb_submit_urb failed with result: %d\n",
                        __func__, retval);
}

static int usbtouch_start_io(struct usbtouch_usb *usbtouch)
{
        guard(mutex)(&usbtouch->pm_mutex);

        if (!usbtouch->type->irq_always)
                if (usb_submit_urb(usbtouch->irq, GFP_KERNEL))
                        return -EIO;

        usbtouch->interface->needs_remote_wakeup = 1;
        usbtouch->is_open = true;

        return 0;
}

static int usbtouch_open(struct input_dev *input)
{
        struct usbtouch_usb *usbtouch = input_get_drvdata(input);
        int r;

        usbtouch->irq->dev = interface_to_usbdev(usbtouch->interface);

        r = usb_autopm_get_interface(usbtouch->interface) ? -EIO : 0;
        if (r)
                return r;

        r = usbtouch_start_io(usbtouch);

        usb_autopm_put_interface(usbtouch->interface);
        return r;
}

static void usbtouch_close(struct input_dev *input)
{
        struct usbtouch_usb *usbtouch = input_get_drvdata(input);
        int r;

        scoped_guard(mutex, &usbtouch->pm_mutex) {
                if (!usbtouch->type->irq_always)
                        usb_kill_urb(usbtouch->irq);
                usbtouch->is_open = false;
        }

        r = usb_autopm_get_interface(usbtouch->interface);
        usbtouch->interface->needs_remote_wakeup = 0;
        if (!r)
                usb_autopm_put_interface(usbtouch->interface);
}

static int usbtouch_suspend(struct usb_interface *intf, pm_message_t message)
{
        struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);

        usb_kill_urb(usbtouch->irq);

        return 0;
}

static int usbtouch_resume(struct usb_interface *intf)
{
        struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);

        guard(mutex)(&usbtouch->pm_mutex);

        if (usbtouch->is_open || usbtouch->type->irq_always)
                return usb_submit_urb(usbtouch->irq, GFP_NOIO);

        return 0;
}

static int usbtouch_reset_resume(struct usb_interface *intf)
{
        struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);
        int err;

        /* reinit the device */
        if (usbtouch->type->init) {
                err = usbtouch->type->init(usbtouch);
                if (err) {
                        dev_dbg(&intf->dev,
                                "%s - type->init() failed, err: %d\n",
                                __func__, err);
                        return err;
                }
        }

        /* restart IO if needed */
        guard(mutex)(&usbtouch->pm_mutex);

        if (usbtouch->is_open)
                return usb_submit_urb(usbtouch->irq, GFP_NOIO);

        return 0;
}

static void usbtouch_free_buffers(struct usb_device *udev,
                                  struct usbtouch_usb *usbtouch)
{
        usb_free_coherent(udev, usbtouch->data_size,
                          usbtouch->data, usbtouch->data_dma);
        kfree(usbtouch->buffer);
}

static struct usb_endpoint_descriptor *
usbtouch_get_input_endpoint(struct usb_host_interface *interface)
{
        int i;

        for (i = 0; i < interface->desc.bNumEndpoints; i++)
                if (usb_endpoint_dir_in(&interface->endpoint[i].desc))
                        return &interface->endpoint[i].desc;

        return NULL;
}

static int usbtouch_probe(struct usb_interface *intf,
                          const struct usb_device_id *id)
{
        struct usbtouch_usb *usbtouch;
        struct input_dev *input_dev;
        struct usb_endpoint_descriptor *endpoint;
        struct usb_device *udev = interface_to_usbdev(intf);
        const struct usbtouch_device_info *type;
        int err = -ENOMEM;

        /* some devices are ignored */
        type = (const struct usbtouch_device_info *)id->driver_info;
        if (!type)
                return -ENODEV;

        endpoint = usbtouch_get_input_endpoint(intf->cur_altsetting);
        if (!endpoint)
                return -ENXIO;

        usbtouch = kzalloc_obj(*usbtouch);
        input_dev = input_allocate_device();
        if (!usbtouch || !input_dev)
                goto out_free;

        mutex_init(&usbtouch->pm_mutex);
        usbtouch->type = type;

        usbtouch->data_size = type->rept_size;
        if (type->get_pkt_len) {
                /*
                 * When dealing with variable-length packets we should
                 * not request more than wMaxPacketSize bytes at once
                 * as we do not know if there is more data coming or
                 * we filled exactly wMaxPacketSize bytes and there is
                 * nothing else.
                 */
                usbtouch->data_size = min(usbtouch->data_size,
                                          usb_endpoint_maxp(endpoint));
        }

        usbtouch->data = usb_alloc_coherent(udev, usbtouch->data_size,
                                            GFP_KERNEL, &usbtouch->data_dma);
        if (!usbtouch->data)
                goto out_free;

        if (type->get_pkt_len) {
                usbtouch->buffer = kmalloc(type->rept_size, GFP_KERNEL);
                if (!usbtouch->buffer)
                        goto out_free_buffers;
                usbtouch->process_pkt = usbtouch_process_multi;
        } else {
                usbtouch->process_pkt = usbtouch_process_pkt;
        }

        usbtouch->irq = usb_alloc_urb(0, GFP_KERNEL);
        if (!usbtouch->irq) {
                dev_dbg(&intf->dev,
                        "%s - usb_alloc_urb failed: usbtouch->irq\n", __func__);
                goto out_free_buffers;
        }

        usbtouch->interface = intf;
        usbtouch->input = input_dev;

        if (udev->manufacturer)
                strscpy(usbtouch->name, udev->manufacturer, sizeof(usbtouch->name));

        if (udev->product) {
                if (udev->manufacturer)
                        strlcat(usbtouch->name, " ", sizeof(usbtouch->name));
                strlcat(usbtouch->name, udev->product, sizeof(usbtouch->name));
        }

        if (!strlen(usbtouch->name))
                snprintf(usbtouch->name, sizeof(usbtouch->name),
                        "USB Touchscreen %04x:%04x",
                         le16_to_cpu(udev->descriptor.idVendor),
                         le16_to_cpu(udev->descriptor.idProduct));

        usb_make_path(udev, usbtouch->phys, sizeof(usbtouch->phys));
        strlcat(usbtouch->phys, "/input0", sizeof(usbtouch->phys));

        input_dev->name = usbtouch->name;
        input_dev->phys = usbtouch->phys;
        usb_to_input_id(udev, &input_dev->id);
        input_dev->dev.parent = &intf->dev;

        input_set_drvdata(input_dev, usbtouch);

        input_dev->open = usbtouch_open;
        input_dev->close = usbtouch_close;

        input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
        input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
        input_set_abs_params(input_dev, ABS_X, type->min_xc, type->max_xc, 0, 0);
        input_set_abs_params(input_dev, ABS_Y, type->min_yc, type->max_yc, 0, 0);
        if (type->max_press)
                input_set_abs_params(input_dev, ABS_PRESSURE, type->min_press,
                                     type->max_press, 0, 0);

        if (usb_endpoint_type(endpoint) == USB_ENDPOINT_XFER_INT)
                usb_fill_int_urb(usbtouch->irq, udev,
                         usb_rcvintpipe(udev, endpoint->bEndpointAddress),
                         usbtouch->data, usbtouch->data_size,
                         usbtouch_irq, usbtouch, endpoint->bInterval);
        else
                usb_fill_bulk_urb(usbtouch->irq, udev,
                         usb_rcvbulkpipe(udev, endpoint->bEndpointAddress),
                         usbtouch->data, usbtouch->data_size,
                         usbtouch_irq, usbtouch);

        usbtouch->irq->dev = udev;
        usbtouch->irq->transfer_dma = usbtouch->data_dma;
        usbtouch->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

        /* device specific allocations */
        if (type->alloc) {
                err = type->alloc(usbtouch);
                if (err) {
                        dev_dbg(&intf->dev,
                                "%s - type->alloc() failed, err: %d\n",
                                __func__, err);
                        goto out_free_urb;
                }
        }

        /* device specific initialisation*/
        if (type->init) {
                err = type->init(usbtouch);
                if (err) {
                        dev_dbg(&intf->dev,
                                "%s - type->init() failed, err: %d\n",
                                __func__, err);
                        goto out_do_exit;
                }
        }

        err = input_register_device(usbtouch->input);
        if (err) {
                dev_dbg(&intf->dev,
                        "%s - input_register_device failed, err: %d\n",
                        __func__, err);
                goto out_do_exit;
        }

        usb_set_intfdata(intf, usbtouch);

        if (usbtouch->type->irq_always) {
                /* this can't fail */
                usb_autopm_get_interface(intf);
                err = usb_submit_urb(usbtouch->irq, GFP_KERNEL);
                if (err) {
                        usb_autopm_put_interface(intf);
                        dev_err(&intf->dev,
                                "%s - usb_submit_urb failed with result: %d\n",
                                __func__, err);
                        goto out_unregister_input;
                }
        }

        return 0;

out_unregister_input:
        input_unregister_device(input_dev);
        input_dev = NULL;
out_do_exit:
        if (type->exit)
                type->exit(usbtouch);
out_free_urb:
        usb_free_urb(usbtouch->irq);
out_free_buffers:
        usbtouch_free_buffers(udev, usbtouch);
out_free:
        input_free_device(input_dev);
        kfree(usbtouch);
        return err;
}

static void usbtouch_disconnect(struct usb_interface *intf)
{
        struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);

        if (!usbtouch)
                return;

        dev_dbg(&intf->dev,
                "%s - usbtouch is initialized, cleaning up\n", __func__);

        usb_set_intfdata(intf, NULL);
        /* this will stop IO via close */
        input_unregister_device(usbtouch->input);
        usb_free_urb(usbtouch->irq);
        if (usbtouch->type->exit)
                usbtouch->type->exit(usbtouch);
        usbtouch_free_buffers(interface_to_usbdev(intf), usbtouch);
        kfree(usbtouch);
}

static const struct attribute_group *usbtouch_groups[] = {
#ifdef CONFIG_TOUCHSCREEN_USB_3M
        &mtouch_attr_group,
#endif
        NULL
};

static const struct usb_device_id usbtouch_devices[] = {
#ifdef CONFIG_TOUCHSCREEN_USB_EGALAX
        /* ignore the HID capable devices, handled by usbhid */
        { USB_DEVICE_INTERFACE_CLASS(0x0eef, 0x0001, USB_INTERFACE_CLASS_HID),
                .driver_info = 0 },
        { USB_DEVICE_INTERFACE_CLASS(0x0eef, 0x0002, USB_INTERFACE_CLASS_HID),
                .driver_info = 0 },

        /* normal device IDs */
        { USB_DEVICE(0x3823, 0x0001),
                .driver_info = (kernel_ulong_t)&egalax_dev_info },
        { USB_DEVICE(0x3823, 0x0002),
                .driver_info = (kernel_ulong_t)&egalax_dev_info },
        { USB_DEVICE(0x0123, 0x0001),
                .driver_info = (kernel_ulong_t)&egalax_dev_info },
        { USB_DEVICE(0x0eef, 0x0001),
                .driver_info = (kernel_ulong_t)&egalax_dev_info },
        { USB_DEVICE(0x0eef, 0x0002),
                .driver_info = (kernel_ulong_t)&egalax_dev_info },
        { USB_DEVICE(0x1234, 0x0001),
                .driver_info = (kernel_ulong_t)&egalax_dev_info },
        { USB_DEVICE(0x1234, 0x0002),
                .driver_info = (kernel_ulong_t)&egalax_dev_info },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_PANJIT
        { USB_DEVICE(0x134c, 0x0001),
                .driver_info = (kernel_ulong_t)&panjit_dev_info },
        { USB_DEVICE(0x134c, 0x0002),
                .driver_info = (kernel_ulong_t)&panjit_dev_info },
        { USB_DEVICE(0x134c, 0x0003),
                .driver_info = (kernel_ulong_t)&panjit_dev_info },
        { USB_DEVICE(0x134c, 0x0004),
                .driver_info = (kernel_ulong_t)&panjit_dev_info },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_3M
        { USB_DEVICE(0x0596, 0x0001),
                .driver_info = (kernel_ulong_t)&mtouch_dev_info },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_ITM
        { USB_DEVICE(0x0403, 0xf9e9),
                .driver_info = (kernel_ulong_t)&itm_dev_info },
        { USB_DEVICE(0x16e3, 0xf9e9),
                .driver_info = (kernel_ulong_t)&itm_dev_info },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_ETURBO
        { USB_DEVICE(0x1234, 0x5678),
                .driver_info = (kernel_ulong_t)&eturbo_dev_info },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_GUNZE
        { USB_DEVICE(0x0637, 0x0001),
                .driver_info = (kernel_ulong_t)&gunze_dev_info },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_DMC_TSC10
        { USB_DEVICE(0x0afa, 0x03e8),
                .driver_info = (kernel_ulong_t)&dmc_tsc10_dev_info },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_IRTOUCH
        { USB_DEVICE(0x255e, 0x0001),
                .driver_info = (kernel_ulong_t)&irtouch_dev_info },
        { USB_DEVICE(0x595a, 0x0001),
                .driver_info = (kernel_ulong_t)&irtouch_dev_info },
        { USB_DEVICE(0x6615, 0x0001),
                .driver_info = (kernel_ulong_t)&irtouch_dev_info },
        { USB_DEVICE(0x6615, 0x0012),
                .driver_info = (kernel_ulong_t)&irtouch_hires_dev_info },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_IDEALTEK
        { USB_DEVICE(0x1391, 0x1000),
                .driver_info = (kernel_ulong_t)&idealtek_dev_info },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_GENERAL_TOUCH
        { USB_DEVICE(0x0dfc, 0x0001),
                .driver_info = (kernel_ulong_t)&general_touch_dev_info },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_GOTOP
        { USB_DEVICE(0x08f2, 0x007f),
                .driver_info = (kernel_ulong_t)&gotop_dev_info },
        { USB_DEVICE(0x08f2, 0x00ce),
                .driver_info = (kernel_ulong_t)&gotop_dev_info },
        { USB_DEVICE(0x08f2, 0x00f4),
                .driver_info = (kernel_ulong_t)&gotop_dev_info },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_JASTEC
        { USB_DEVICE(0x0f92, 0x0001),
                .driver_info = (kernel_ulong_t)&jastec_dev_info },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_E2I
        { USB_DEVICE(0x1ac7, 0x0001),
                .driver_info = (kernel_ulong_t)&e2i_dev_info },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_ZYTRONIC
        { USB_DEVICE(0x14c8, 0x0003),
                .driver_info = (kernel_ulong_t)&zytronic_dev_info },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_ETT_TC45USB
        /* TC5UH */
        { USB_DEVICE(0x0664, 0x0309),
                .driver_info = (kernel_ulong_t)&tc45usb_dev_info },
        /* TC4UM */
        { USB_DEVICE(0x0664, 0x0306),
                .driver_info = (kernel_ulong_t)&tc45usb_dev_info },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_NEXIO
        /* data interface only */
        { USB_DEVICE_AND_INTERFACE_INFO(0x10f0, 0x2002, 0x0a, 0x00, 0x00),
                .driver_info = (kernel_ulong_t)&nexio_dev_info },
        { USB_DEVICE_AND_INTERFACE_INFO(0x1870, 0x0001, 0x0a, 0x00, 0x00),
                .driver_info = (kernel_ulong_t)&nexio_dev_info },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_ELO
        { USB_DEVICE(0x04e7, 0x0020),
                .driver_info = (kernel_ulong_t)&elo_dev_info },
#endif

#ifdef CONFIG_TOUCHSCREEN_USB_EASYTOUCH
        { USB_DEVICE(0x7374, 0x0001),
                .driver_info = (kernel_ulong_t)&etouch_dev_info },
#endif

        { }
};
MODULE_DEVICE_TABLE(usb, usbtouch_devices);

static struct usb_driver usbtouch_driver = {
        .name           = "usbtouchscreen",
        .probe          = usbtouch_probe,
        .disconnect     = usbtouch_disconnect,
        .suspend        = usbtouch_suspend,
        .resume         = usbtouch_resume,
        .reset_resume   = usbtouch_reset_resume,
        .id_table       = usbtouch_devices,
        .dev_groups     = usbtouch_groups,
        .supports_autosuspend = 1,
};

module_usb_driver(usbtouch_driver);

MODULE_AUTHOR("Daniel Ritz <daniel.ritz@gmx.ch>");
MODULE_DESCRIPTION("USB Touchscreen Driver");
MODULE_LICENSE("GPL");

MODULE_ALIAS("touchkitusb");
MODULE_ALIAS("itmtouch");
MODULE_ALIAS("mtouchusb");