Resistive touchscreen + Adafruit AR1100 + UDOO

Discussion in 'Android' started by cmex81, Oct 28, 2014.

?

Is it need fix usbtouchscreen for previous devices + ar1100

  1. Yes, do it

    3 vote(s)
    100.0%
  2. No, I'll do it and share a new version with community

    0 vote(s)
    0.0%
  3. No, it's ok

    0 vote(s)
    0.0%
  1. cmex81

    cmex81 New Member

    Joined:
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    Hello all,

    Some notes for persons, who would like to use AR1100 (USB mode) with UDOO under Android.

    At first useful links:
    1. https://www.adafruit.com/product/1580 - AR1100 from Adafruit
    2. http://a20androidincar.wordpress.com/co ... uchscreen/ - Configuring the resistive touchscreen ( example)
    3. http://pccar.ru/showpost.php?p=283807&postcount=8 - Vendor_04d8_Product_0c03.idc

    OK, now the procedure:

    1. Create file "Vendor_04d8_Product_0c03.idc" and put to the "/system/usr/idc/" (see link [3] for detailed information)
    2. Change file "/kernel_imx/drivers/input/touchscreen/usbtouchscreen.c "
    3. Rebuild and refresh firmware on sdcard

    PS: a modified "usbtouchscreen.c" must be fix for support all previous devices
    today modification correctly support only ar1100. only for test purpose.

    A modified usbtouchscreen.c
    Code:
    /******************************************************************************
     * usbtouchscreen.c
     * !!!!! for test purpose only !!!!!
     * modified by Vladimir Khudoshin <cmex81@gmail.com> for AR1100 (HID-DIGITIZER).
     * needs to be corrected for support all previous devices and a new ar1100. 
     * current modification correctly support only ar1100
     * 
     * 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
     *
     * Copyright (C) 2004-2007 by Daniel Ritz <daniel.ritz@gmx.ch>
     * Copyright (C) by Todd E. Johnson (mtouchusb.c)
     *
     * This program is free software; you can redistribute it and/or
     * modify it under the terms of the GNU General Public License as
     * published by the Free Software Foundation; either version 2 of the
     * License, or (at your option) any later version.
     *
     * This program is distributed in the hope that it will be useful, but
     * WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     * General Public License for more details.
     *
     * You should have received a copy of the GNU General Public License
     * along with this program; if not, write to the Free Software
     * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
     *
     * 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/init.h>
    #include <linux/usb.h>
    #include <linux/usb/input.h>
    #include <linux/hid.h>
    
    
    #define DRIVER_VERSION		"v0.6"
    #define DRIVER_AUTHOR		"Daniel Ritz <daniel.ritz@gmx.ch>"
    #define DRIVER_DESC		"USB Touchscreen Driver"
    
    static int swap_xy;
    module_param(swap_xy, bool, 0644);
    MODULE_PARM_DESC(swap_xy, "If set X and Y axes are swapped.");
    
    static int hwcalib_xy = 1;
    module_param(hwcalib_xy, bool, 0644);
    MODULE_PARM_DESC(hwcalib_xy, "If set hw-calibrated X/Y are used if available");
    
    #define TOUCHSCREEN_TYPE_NULL	0
    #define TOUCHSCREEN_TYPE_3M	1
    
    static int touchscreen_type = TOUCHSCREEN_TYPE_NULL;
    module_param(touchscreen_type, int, 0444);
    MODULE_PARM_DESC(touchscreen_type, "Return touchscreen type found");
    
    #ifdef CONFIG_TOUCHSCREEN_USB_3M
    static int calibration[9];
    module_param_array(calibration, int, NULL, S_IRUGO | S_IWUSR);
    MODULE_PARM_DESC(calibration, "Calibration param contains calibration factors");
    #endif
    
    /* 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;
    
    	void (*process_pkt) (struct usbtouch_usb *usbtouch, unsigned char *pkt, int len);
    
    	/*
    	 * 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;
    	unsigned char *buffer;
    	int buf_len;
    	struct urb *irq;
    	struct usb_interface *interface;
    	struct input_dev *input;
    	struct usbtouch_device_info *type;
    	char name[128];
    	char phys[64];
    	void *priv;
    
    	int x, y;
    	int touch, press;
    };
    
    
    /* device types */
    enum {
    	DEVTYPE_IGNORE = -1,
    	DEVTYPE_EGALAX,
    	DEVTYPE_PANJIT,
    	DEVTYPE_3M,
    	DEVTYPE_ITM,
    	DEVTYPE_ETURBO,
    	DEVTYPE_GUNZE,
    	DEVTYPE_DMC_TSC10,
    	DEVTYPE_IRTOUCH,
    	DEVTYPE_IDEALTEK,
    	DEVTYPE_GENERAL_TOUCH,
    	DEVTYPE_GOTOP,
    	DEVTYPE_JASTEC,
    	DEVTYPE_E2I,
    	DEVTYPE_ZYTRONIC,
    	DEVTYPE_TC45USB,
    	DEVTYPE_NEXIO,
    	DEVTYPE_AR1100,
    };
    
    #define USB_DEVICE_HID_CLASS(vend, prod) \
    	.match_flags = USB_DEVICE_ID_MATCH_INT_CLASS \
    		| USB_DEVICE_ID_MATCH_INT_PROTOCOL \
    		| USB_DEVICE_ID_MATCH_DEVICE, \
    	.idVendor = (vend), \
    	.idProduct = (prod), \
    	.bInterfaceClass = USB_INTERFACE_CLASS_HID, \
    	.bInterfaceProtocol = USB_INTERFACE_PROTOCOL_MOUSE
    
    static const struct usb_device_id usbtouch_devices[] = {
    #ifdef CONFIG_TOUCHSCREEN_USB_EGALAX
    	/* ignore the HID capable devices, handled by usbhid */
    	{USB_DEVICE_HID_CLASS(0x0eef, 0x0001), .driver_info = DEVTYPE_IGNORE},
    	{USB_DEVICE_HID_CLASS(0x0eef, 0x0002), .driver_info = DEVTYPE_IGNORE},
    
    	/* normal device IDs */
    	{USB_DEVICE(0x3823, 0x0001), .driver_info = DEVTYPE_EGALAX},
    	{USB_DEVICE(0x3823, 0x0002), .driver_info = DEVTYPE_EGALAX},
    	{USB_DEVICE(0x0123, 0x0001), .driver_info = DEVTYPE_EGALAX},
    	{USB_DEVICE(0x0eef, 0x0001), .driver_info = DEVTYPE_EGALAX},
    	{USB_DEVICE(0x0eef, 0x0002), .driver_info = DEVTYPE_EGALAX},
    	{USB_DEVICE(0x1234, 0x0001), .driver_info = DEVTYPE_EGALAX},
    	{USB_DEVICE(0x1234, 0x0002), .driver_info = DEVTYPE_EGALAX},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_PANJIT
    	{USB_DEVICE(0x134c, 0x0001), .driver_info = DEVTYPE_PANJIT},
    	{USB_DEVICE(0x134c, 0x0002), .driver_info = DEVTYPE_PANJIT},
    	{USB_DEVICE(0x134c, 0x0003), .driver_info = DEVTYPE_PANJIT},
    	{USB_DEVICE(0x134c, 0x0004), .driver_info = DEVTYPE_PANJIT},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_3M
    	{USB_DEVICE(0x0596, 0x0001), .driver_info = DEVTYPE_3M},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_ITM
    	{USB_DEVICE(0x0403, 0xf9e9), .driver_info = DEVTYPE_ITM},
    	{USB_DEVICE(0x16e3, 0xf9e9), .driver_info = DEVTYPE_ITM},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_ETURBO
    	{USB_DEVICE(0x1234, 0x5678), .driver_info = DEVTYPE_ETURBO},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_GUNZE
    	{USB_DEVICE(0x0637, 0x0001), .driver_info = DEVTYPE_GUNZE},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_DMC_TSC10
    	{USB_DEVICE(0x0afa, 0x03e8), .driver_info = DEVTYPE_DMC_TSC10},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_IRTOUCH
    	{USB_DEVICE(0x595a, 0x0001), .driver_info = DEVTYPE_IRTOUCH},
    	{USB_DEVICE(0x6615, 0x0001), .driver_info = DEVTYPE_IRTOUCH},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_IDEALTEK
    	{USB_DEVICE(0x1391, 0x1000), .driver_info = DEVTYPE_IDEALTEK},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_GENERAL_TOUCH
    	{USB_DEVICE(0x0dfc, 0x0001), .driver_info = DEVTYPE_GENERAL_TOUCH},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_GOTOP
    	{USB_DEVICE(0x08f2, 0x007f), .driver_info = DEVTYPE_GOTOP},
    	{USB_DEVICE(0x08f2, 0x00ce), .driver_info = DEVTYPE_GOTOP},
    	{USB_DEVICE(0x08f2, 0x00f4), .driver_info = DEVTYPE_GOTOP},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_JASTEC
    	{USB_DEVICE(0x0f92, 0x0001), .driver_info = DEVTYPE_JASTEC},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_E2I
    	{USB_DEVICE(0x1ac7, 0x0001), .driver_info = DEVTYPE_E2I},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_ZYTRONIC
    	{USB_DEVICE(0x14c8, 0x0003), .driver_info = DEVTYPE_ZYTRONIC},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_ETT_TC45USB
    	/* TC5UH */
    	{USB_DEVICE(0x0664, 0x0309), .driver_info = DEVTYPE_TC45USB},
    	/* TC4UM */
    	{USB_DEVICE(0x0664, 0x0306), .driver_info = DEVTYPE_TC45USB},
    #endif
    	{USB_DEVICE(0x04D8, 0x0C03), .driver_info = DEVTYPE_AR1100},
    
    #ifdef CONFIG_TOUCHSCREEN_USB_NEXIO
    	/* data interface only */
    	{USB_DEVICE_AND_INTERFACE_INFO(0x10f0, 0x2002, 0x0a, 0x00, 0x00),
    		.driver_info = DEVTYPE_NEXIO},
    	{USB_DEVICE_AND_INTERFACE_INFO(0x1870, 0x0001, 0x0a, 0x00, 0x00),
    		.driver_info = DEVTYPE_NEXIO},
    #endif
    
    	{}
    };
    
    
    /*****************************************************************************
     * 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_rcvctrlpipe(udev, 0),
    	                      0x01, 0x02, 0x0000, 0x0081,
    	                      NULL, 0, USB_CTRL_SET_TIMEOUT);
    
    	dbg("%s - usb_control_msg - E2I_RESET - bytes|err: %d",
    	    __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;
    }
    #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_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;
    }
    #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;
    }
    #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 XSCALE		0
    #define XYMIX		1
    #define XOFFSET		2
    #define YXMIX		3
    #define YSCALE		4
    #define YOFFSET		5
    #define SCALE		6
    #define XSIZE		7
    #define YSIZE		8
    
    static int mtouch_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
    {
    	if (hwcalib_xy) {
    		dev->x = 0xffff -  ((pkt[4] << 8) | pkt[3]);
    		dev->y = ((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;
    
    	if(calibration[SCALE] != 0)
    	{
    		u32 x = dev->x, y = dev->y;
    		u32 max_xc = 0, max_yc = 0;
    		if (hwcalib_xy)
    			max_xc = max_yc = 0xffff;
    		else
    		{
    			max_xc = dev->type->max_xc;
    			max_yc = dev->type->max_yc;
    		}
    
    //		printk(KERN_WARNING "usb: PRECALIB  X = %d  Y=%d, MAX=%d, %d\n", dev->x, dev->y, max_xc, max_yc);
    	
    		x = calibration[XSCALE] * dev->x +
    			calibration[XYMIX] * dev->y +
    			calibration[XOFFSET];
    
    //		x = ((x / calibration[SCALE]) * max_xc) / calibration[XSIZE];		
    		x = x / calibration[XSIZE];
    		if (x < 0)
    			x = 0;
    
    		y = calibration[YSCALE] * dev->y +
    			calibration[YXMIX] * dev->x +
    			calibration[YOFFSET];
    //		y = ((y / calibration[SCALE]) * max_yc) / calibration[YSIZE];
    		y = y / calibration[YSIZE];
    		if (y < 0)
    			y = 0;
    		
    		dev->x = x;
    		dev->y = y;
    //		printk(KERN_WARNING "usb: CALIB  X = %d  Y=%d\n", x, y);
    	}
    //	printk(KERN_WARNING "usb: using  X = %d  Y=%d\n", dev->x, dev->y);
    
    	return 1;
    }
    
    static int mtouch_init(struct usbtouch_usb *usbtouch)
    {
    	int ret, i;
    	struct usb_device *udev = interface_to_usbdev(usbtouch->interface);
    
    	ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
    	                      MTOUCHUSB_RESET,
    	                      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
    	                      1, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
    	dbg("%s - usb_control_msg - MTOUCHUSB_RESET - bytes|err: %d",
    	    __func__, ret);
    	if (ret < 0)
    		return ret;
    	msleep(150);
    
    	for (i = 0; i < 3; i++) {
    		ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
    				      MTOUCHUSB_ASYNC_REPORT,
    				      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
    				      1, 1, NULL, 0, USB_CTRL_SET_TIMEOUT);
    		dbg("%s - usb_control_msg - MTOUCHUSB_ASYNC_REPORT - bytes|err: %d",
    		    __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);
    	}
    	
    	touchscreen_type = TOUCHSCREEN_TYPE_3M;
    
    	return 0;
    }
    #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;
    }
    #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;
    }
    #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;
    }
    #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 = -ENOMEM;
    	unsigned char *buf;
    
    	buf = kmalloc(2, GFP_NOIO);
    	if (!buf)
    		goto err_nobuf;
    	/* 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)
    		goto err_out;
    	if (buf[0] != 0x06) {
    		ret = -ENODEV;
    		goto err_out;
    	}
    
    	/* 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)
    		goto err_out;
    	if ((buf[0] != 0x06) && (buf[0] != 0x15 || buf[1] != 0x01)) {
    		ret = -ENODEV;
    		goto err_out;
    	}
    
    	/* start sending data */
    	ret = usb_control_msg(dev, usb_rcvctrlpipe (dev, 0),
    	                      TSC10_CMD_DATA1,
    	                      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
    	                      0, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
    err_out:
    	kfree(buf);
    err_nobuf:
    	return ret;
    }
    
    
    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;
    }
    #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;
    }
    #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;
    }
    #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;
    	}
    }
    #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;
    }
    #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;
    }
    #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;
    }
    #endif
    
    /*****************************************************************************
     * Zytronic Part
     */
    #ifdef CONFIG_TOUCHSCREEN_USB_ZYTRONIC
    static int zytronic_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
    {
    	switch (pkt[0]) {
    	case 0x3A: /* command response */
    		dbg("%s: Command response %d", __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;
    		dbg("%s: down %d,%d", __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;
    		dbg("%s: up %d,%d", __func__, dev->x, dev->y);
    		return 1;
    
    	default:
    		dbg("%s: Unknown return %d", __func__, pkt[0]);
    		break;
    	}
    
    	return 0;
    }
    #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;
    
    	usbtouch->priv = kmalloc(sizeof(struct nexio_priv), GFP_KERNEL);
    	if (!usbtouch->priv)
    		goto out_buf;
    
    	priv = usbtouch->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) {
    		dbg("%s - usb_alloc_urb failed: usbtouch->ack", __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;
    	unsigned char *buf;
    	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;
    
    	buf = kmalloc(NEXIO_BUFSIZE, GFP_NOIO);
    	if (!buf)
    		goto out_buf;
    
    	/* 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)
    			goto out_buf;
    	}
    
    	/* 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)
    		goto out_buf;
    
    	/* 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);
    	ret = 0;
    
    out_buf:
    	kfree(buf);
    	return ret;
    }
    
    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 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 (!usbtouch->type->max_xc) {
    		usbtouch->type->max_xc = 2 * x_len;
    		input_set_abs_params(usbtouch->input, ABS_X,
    				     0, usbtouch->type->max_xc, 0, 0);
    		usbtouch->type->max_yc = 2 * y_len;
    		input_set_abs_params(usbtouch->input, ABS_Y,
    				     0, usbtouch->type->max_yc, 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;
    }
    #endif
    
    static int ar1100_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
    {
    	int tmp = pkt[0] & 0x01;
    	dev->x  = (pkt[3] << 8) | pkt[2];
    	dev->y  = (pkt[5] << 8) | pkt[4];
    
    	dev->touch = (tmp > 0);
    	dev->press = (tmp > 0 ? tmp : 0);
    
    	return 1;
    }
    
    
    /*****************************************************************************
     * the different device descriptors
     */
    #ifdef MULTI_PACKET
    static void usbtouch_process_multi(struct usbtouch_usb *usbtouch,
    				   unsigned char *pkt, int len);
    #endif
    
    static struct usbtouch_device_info usbtouch_dev_info[] = {
    #ifdef CONFIG_TOUCHSCREEN_USB_EGALAX
    	[DEVTYPE_EGALAX] = {
    		.min_xc		= 0x0,
    		.max_xc		= 0x07ff,
    		.min_yc		= 0x0,
    		.max_yc		= 0x07ff,
    		.rept_size	= 16,
    		.process_pkt	= usbtouch_process_multi,
    		.get_pkt_len	= egalax_get_pkt_len,
    		.read_data	= egalax_read_data,
    	},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_PANJIT
    	[DEVTYPE_PANJIT] = {
    		.min_xc		= 0x0,
    		.max_xc		= 0x0fff,
    		.min_yc		= 0x0,
    		.max_yc		= 0x0fff,
    		.rept_size	= 8,
    		.read_data	= panjit_read_data,
    	},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_3M
    	[DEVTYPE_3M] = {
    		.min_xc		= 0x0,
    		.max_xc		= 0x4000,
    		.min_yc		= 0x0,
    		.max_yc		= 0x4000,
    		.rept_size	= 11,
    		.read_data	= mtouch_read_data,
    		.init		= mtouch_init,
    	},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_ITM
    	[DEVTYPE_ITM] = {
    		.min_xc		= 0x0,
    		.max_xc		= 0x0fff,
    		.min_yc		= 0x0,
    		.max_yc		= 0x0fff,
    		.max_press	= 0xff,
    		.rept_size	= 8,
    		.read_data	= itm_read_data,
    	},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_ETURBO
    	[DEVTYPE_ETURBO] = {
    		.min_xc		= 0x0,
    		.max_xc		= 0x07ff,
    		.min_yc		= 0x0,
    		.max_yc		= 0x07ff,
    		.rept_size	= 8,
    		.process_pkt	= usbtouch_process_multi,
    		.get_pkt_len	= eturbo_get_pkt_len,
    		.read_data	= eturbo_read_data,
    	},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_GUNZE
    	[DEVTYPE_GUNZE] = {
    		.min_xc		= 0x0,
    		.max_xc		= 0x0fff,
    		.min_yc		= 0x0,
    		.max_yc		= 0x0fff,
    		.rept_size	= 4,
    		.read_data	= gunze_read_data,
    	},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_DMC_TSC10
    	[DEVTYPE_DMC_TSC10] = {
    		.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
    
    #ifdef CONFIG_TOUCHSCREEN_USB_IRTOUCH
    	[DEVTYPE_IRTOUCH] = {
    		.min_xc		= 0x0,
    		.max_xc		= 0x0fff,
    		.min_yc		= 0x0,
    		.max_yc		= 0x0fff,
    		.rept_size	= 8,
    		.read_data	= irtouch_read_data,
    	},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_IDEALTEK
    	[DEVTYPE_IDEALTEK] = {
    		.min_xc		= 0x0,
    		.max_xc		= 0x0fff,
    		.min_yc		= 0x0,
    		.max_yc		= 0x0fff,
    		.rept_size	= 8,
    		.process_pkt	= usbtouch_process_multi,
    		.get_pkt_len	= idealtek_get_pkt_len,
    		.read_data	= idealtek_read_data,
    	},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_GENERAL_TOUCH
    	[DEVTYPE_GENERAL_TOUCH] = {
    		.min_xc		= 0x0,
    		.max_xc		= 0x7fff,
    		.min_yc		= 0x0,
    		.max_yc		= 0x7fff,
    		.rept_size	= 7,
    		.read_data	= general_touch_read_data,
    	},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_GOTOP
    	[DEVTYPE_GOTOP] = {
    		.min_xc		= 0x0,
    		.max_xc		= 0x03ff,
    		.min_yc		= 0x0,
    		.max_yc		= 0x03ff,
    		.rept_size	= 4,
    		.read_data	= gotop_read_data,
    	},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_JASTEC
    	[DEVTYPE_JASTEC] = {
    		.min_xc		= 0x0,
    		.max_xc		= 0x0fff,
    		.min_yc		= 0x0,
    		.max_yc		= 0x0fff,
    		.rept_size	= 4,
    		.read_data	= jastec_read_data,
    	},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_E2I
    	[DEVTYPE_E2I] = {
    		.min_xc		= 0x0,
    		.max_xc		= 0x7fff,
    		.min_yc		= 0x0,
    		.max_yc		= 0x7fff,
    		.rept_size	= 6,
    		.init		= e2i_init,
    		.read_data	= e2i_read_data,
    	},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_ZYTRONIC
    	[DEVTYPE_ZYTRONIC] = {
    		.min_xc		= 0x0,
    		.max_xc		= 0x03ff,
    		.min_yc		= 0x0,
    		.max_yc		= 0x03ff,
    		.rept_size	= 5,
    		.read_data	= zytronic_read_data,
    		.irq_always     = true,
    	},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_ETT_TC45USB
    	[DEVTYPE_TC45USB] = {
    		.min_xc		= 0x0,
    		.max_xc		= 0x0fff,
    		.min_yc		= 0x0,
    		.max_yc		= 0x0fff,
    		.rept_size	= 5,
    		.read_data	= tc45usb_read_data,
    	},
    #endif
    
    #ifdef CONFIG_TOUCHSCREEN_USB_NEXIO
    	[DEVTYPE_NEXIO] = {
    		.rept_size	= 1024,
    		.irq_always	= true,
    		.read_data	= nexio_read_data,
    		.alloc		= nexio_alloc,
    		.init		= nexio_init,
    		.exit		= nexio_exit,
    	},
    #endif
    	[DEVTYPE_AR1100] = {
    		.min_xc		= 0x012A,
    		.max_xc		= 0x0EFD,
    		.min_yc		= 0x00BF,
    		.max_yc		= 0x0F43,
    		.rept_size	= 6,
    		.read_data	= ar1100_read_data,
    },
    };
    
    
    /*****************************************************************************
     * Generic Part
     */
    static void usbtouch_process_pkt(struct usbtouch_usb *usbtouch,
                                     unsigned char *pkt, int len)
    {
    	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);
    	}
    */
    	input_report_abs(usbtouch->input, ABS_X, usbtouch->y);
    	input_report_abs(usbtouch->input, ABS_Y, usbtouch->x);
    	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;
    }
    #endif
    
    
    static void usbtouch_irq(struct urb *urb)
    {
    	struct usbtouch_usb *usbtouch = urb->context;
    	int retval;
    
    	switch (urb->status) {
    	case 0:
    		/* success */
    		break;
    	case -ETIME:
    		/* this urb is timing out */
    		dbg("%s - urb timed out - was the device unplugged?",
    		    __func__);
    		return;
    	case -ECONNRESET:
    	case -ENOENT:
    	case -ESHUTDOWN:
    	case -EPIPE:
    		/* this urb is terminated, clean up */
    		dbg("%s - urb shutting down with status: %d",
    		    __func__, urb->status);
    		return;
    	default:
    		dbg("%s - nonzero urb status received: %d",
    		    __func__, urb->status);
    		goto exit;
    	}
    
    	usbtouch->type->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)
    		err("%s - usb_submit_urb failed with result: %d",
    		    __func__, retval);
    }
    
    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 < 0)
    		goto out;
    
    	if (!usbtouch->type->irq_always) {
    		if (usb_submit_urb(usbtouch->irq, GFP_KERNEL)) {
    			r = -EIO;
    			goto out_put;
    		}
    	}
    
    	usbtouch->interface->needs_remote_wakeup = 1;
    out_put:
    	usb_autopm_put_interface(usbtouch->interface);
    out:
    	return r;
    }
    
    static void usbtouch_close(struct input_dev *input)
    {
    	struct usbtouch_usb *usbtouch = input_get_drvdata(input);
    	int r;
    
    	if (!usbtouch->type->irq_always)
    		usb_kill_urb(usbtouch->irq);
    	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);
    	struct input_dev *input = usbtouch->input;
    	int result = 0;
    
    	mutex_lock(&input->mutex);
    	if (input->users || usbtouch->type->irq_always)
    		result = usb_submit_urb(usbtouch->irq, GFP_NOIO);
    	mutex_unlock(&input->mutex);
    
    	return result;
    }
    
    static int usbtouch_reset_resume(struct usb_interface *intf)
    {
    	struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);
    	struct input_dev *input = usbtouch->input;
    	int err = 0;
    
    	/* reinit the device */
    	if (usbtouch->type->init) {
    		err = usbtouch->type->init(usbtouch);
    		if (err) {
    			dbg("%s - type->init() failed, err: %d",
    			    __func__, err);
    			return err;
    		}
    	}
    
    	/* restart IO if needed */
    	mutex_lock(&input->mutex);
    	if (input->users)
    		err = usb_submit_urb(usbtouch->irq, GFP_NOIO);
    	mutex_unlock(&input->mutex);
    
    	return err;
    }
    
    static void usbtouch_free_buffers(struct usb_device *udev,
    				  struct usbtouch_usb *usbtouch)
    {
    	usb_free_coherent(udev, usbtouch->type->rept_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);
    	struct usbtouch_device_info *type;
    	int err = -ENOMEM;
    
    	/* some devices are ignored */
    	if (id->driver_info == DEVTYPE_IGNORE)
    		return -ENODEV;
    
    	endpoint = usbtouch_get_input_endpoint(intf->cur_altsetting);
    	if (!endpoint)
    		return -ENXIO;
    
    	usbtouch = kzalloc(sizeof(struct usbtouch_usb), GFP_KERNEL);
    	input_dev = input_allocate_device();
    	if (!usbtouch || !input_dev)
    		goto out_free;
    
    	type = &usbtouch_dev_info[id->driver_info];
    	usbtouch->type = type;
    	if (!type->process_pkt)
    		type->process_pkt = usbtouch_process_pkt;
    
    	usbtouch->data = usb_alloc_coherent(udev, type->rept_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->irq = usb_alloc_urb(0, GFP_KERNEL);
    	if (!usbtouch->irq) {
    		dbg("%s - usb_alloc_urb failed: usbtouch->irq", __func__);
    		goto out_free_buffers;
    	}
    
    	usbtouch->interface = intf;
    	usbtouch->input = input_dev;
    
    	if (udev->manufacturer)
    		strlcpy(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, type->rept_size,
    			 usbtouch_irq, usbtouch, endpoint->bInterval);
    	else
    		usb_fill_bulk_urb(usbtouch->irq, udev,
    			 usb_rcvbulkpipe(udev, endpoint->bEndpointAddress),
    			 usbtouch->data, type->rept_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) {
    			dbg("%s - type->alloc() failed, err: %d", __func__, err);
    			goto out_free_urb;
    		}
    	}
    
    	/* device specific initialisation*/
    	if (type->init) {
    		err = type->init(usbtouch);
    		if (err) {
    			dbg("%s - type->init() failed, err: %d", __func__, err);
    			goto out_do_exit;
    		}
    	}
    
    	err = input_register_device(usbtouch->input);
    	if (err) {
    		dbg("%s - input_register_device failed, err: %d", __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);
    			err("%s - usb_submit_urb failed with result: %d",
    			    __func__, err);
    			goto out_unregister_input;
    		}
    	}
    
    #ifdef CONFIG_TOUCHSCREEN_USB_3M
    	memset(calibration, 0, sizeof(calibration));
    #endif
    	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);
    
    	dbg("%s - called", __func__);
    
    	if (!usbtouch)
    		return;
    
    	dbg("%s - usbtouch is initialized, cleaning up", __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);
    }
    
    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,
    	.supports_autosuspend = 1,
    };
    
    static int __init usbtouch_init(void)
    {
    	return usb_register(&usbtouch_driver);
    }
    
    static void __exit usbtouch_cleanup(void)
    {
    	usb_deregister(&usbtouch_driver);
    }
    
    module_init(usbtouch_init);
    module_exit(usbtouch_cleanup);
    
    MODULE_AUTHOR(DRIVER_AUTHOR);
    MODULE_DESCRIPTION(DRIVER_DESC);
    MODULE_LICENSE("GPL");
    
    MODULE_ALIAS("touchkitusb");
    MODULE_ALIAS("itmtouch");
    MODULE_ALIAS("mtouchusb"); 
    
     
  2. idorel77

    idorel77 Member

    Joined:
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    Hello,
    working for eGalax resistive usb touchscreen ?

    Thanks.
     
  3. cmex81

    cmex81 New Member

    Joined:
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    Please, use this link: https://a20androidincar.wordpress.com/c ... uchscreen/ for eGalax usb touchscreen, or I can modify source within next few days and upload to forum: support ar1100 and eGalax... but I will wait feedback, because I have only Ar1100 and can't verify for eGalax
     
  4. idorel77

    idorel77 Member

    Joined:
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    I will wait the sorce, if it's ok and i will send the feedback.

    Thank you.
     
  5. idorel77

    idorel77 Member

    Joined:
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    Hi cmex81,
    i try it this procedure for egalax but is not working. i don't have any point touch.

    I try it also other procedures without success.

    On another forum i saw the same problem with egalax + android 4.3 , and the problem was fix it efter upgrade to android 4.4.
    unfortunately we have no OTA very soon, i think.

    Thanks.
     
  6. cmex81

    cmex81 New Member

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    Hi idorel77, could you post link for your touchscreen... I'll try to find in my city...(if touchscreen not expensive for purchase , I'll try to make a patch)
     
  7. idorel77

    idorel77 Member

    Joined:
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    Hi , thanks a lot.

    The touchscreen i buy it from ebay http://www.ebay.com/itm/8inch-4-wire-Re ... 53fc838e7f

    USB TouchController:

    Product ID: 0x0001
    Vendor ID: 0x0eef (D-WAV SCIENTIFIC CO., LTD.)
    Version: 1.00
    Speed: Up to 1.5 Mb/sec
    Manufacturer: eGalax Inc.
    Location ID: 0x14100000 / 27
    Current Available (mA): 500
    Current Required (mA): 100

    If u can't find , i can test every modification if this can help.
     
  8. idorel77

    idorel77 Member

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    Hello cmex81 ,
    today i recopiled and i used your metod with a modified usbtouchscreen.c too.
    But i have same result :( .

    Note: i use the touch on raspberry pi and its working.
     
  9. his

    his New Member

    Joined:
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    Hello,
    I have the same issue with idorel77.
    I found https://github.com/UDOOboard/Kernel_Unico is the source code that udoo team published.
    The device that i have is again same with idorel77's screen.
    Product ID: 0x0001
    Vendor ID: 0x0eef (D-WAV SCIENTIFIC CO., LTD.)
    Version: 1.00
    Speed: Up to 1.5 Mb/sec
    Manufacturer: eGalax Inc.
    Location ID: 0x14100000 / 27
    Current Available (mA): 500
    Current Required (mA): 100
    The code that you shared has the code line;
    {USB_DEVICE(0x0eef, 0x0001), .driver_info = DEVTYPE_EGALAX},
    Seems that if i recompile the source code, the device will work. (Also i have to do https://a20androidincar.wordpress.com/configuring-the-touchscreen/)
    But i really dont know how can i do. If i compile this sources, will i have an android image?
    Could you help me or give some information?
    I would like to add cmex81's usbtouchscreen.c file and do an android image file of 4.4.2 version.
    Any help greatly appreciated.
     
    Last edited: Dec 28, 2015
  10. Andrea Rovai

    Andrea Rovai Well-Known Member

    Joined:
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    his likes this.

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