[PATCH] NEXIO (or iNexio) support for usbtouchscreen

[Ondrej Zary <linux@rainbow-software.org>]

Hello,
I have a NEXIO (or iNexio) NEX170MRT LCD monitor with integrated touchscreen 
with USB interface:
T:  Bus=02 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 54 Spd=12  MxCh= 0
D:  Ver= 1.10 Cls=02(comm.) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=1870 ProdID=0001 Rev= 1.00
S:  Manufacturer=iNexio
S:  Product=iNexio USB
C:* #Ifs= 2 Cfg#= 1 Atr=c0 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=02 Prot=00 Driver=usbtouchscreen
E:  Ad=83(I) Atr=03(Int.) MxPS=   8 Ivl=255ms
I:* If#= 1 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=(none)
E:  Ad=01(O) Atr=02(Bulk) MxPS=  64 Ivl=0ms
E:  Ad=82(I) Atr=02(Bulk) MxPS=  64 Ivl=0ms


There's a iNexio serial touchscreen driver in kernel but it does not work for 
this touchscreen. Without a driver, it just connects and disconnects (after a 
while) repeatedly:
usb 2-2: new full speed USB device using uhci_hcd and address 3
usb 2-2: New USB device found, idVendor=1870, idProduct=0001
usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 2-2: Product: iNexio USB
usb 2-2: Manufacturer: iNexio
usb 2-2: configuration #1 chosen from 1 choice
usb 2-2: USB disconnect, address 3
usb 2-2: new full speed USB device using uhci_hcd and address 4
usb 2-2: New USB device found, idVendor=1870, idProduct=0001
usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 2-2: Product: iNexio USB
usb 2-2: Manufacturer: iNexio
usb 2-2: configuration #1 chosen from 1 choice
usb 2-2: USB disconnect, address 4


I captured (using SniffUSB) the communication between the Windows driver and 
the touchscreen after plugging in:
http://www.rainbow-software.org/linux_files/nexio/UsbSnoop-plug.log

Log with some touches after plugging in:
http://www.rainbow-software.org/linux_files/nexio/UsbSnoop-plugandtouch.log

If I understand it correctly, there's system initialization (first 3 URBs), 
then the driver starts communication:
URB 4: read, touchscreen returns 82 04 ab aa
URB 5: read, touchscreen returns nothing
URB 6: write 82 04 0a 0f
URB 7: read, touchscreen returns 84 04 0a 0f
URB 8: read, touchscreen returns 83 0a 32 2e 31 30 53 4d 53 4e (2.10SMSN - 
       firmware version as Windows driver displays)
URB 9: read, touchscreen returns 84 09 6d 2d 4e 65 78 69 6f (m-Nexio - device
       name as Windows driver displays)
URB 10: read, touchscreen returns nothing

Then 3 reads touchscreen returns nothing and returns "82 04 ab aa" on the 4th 
read.

Touchscreen sends 123 bytes of touch data:
    00000000: e1 00 74 00 40 00 34 00 00 00 11 10 0d 00 11 00
    00000010: 0a 00 01 07 03 04 02 03 00 05 00 0e 09 00 02 08
    00000020: 00 01 00 01 01 06 00 0e 00 0b 14 01 0d 06 00 00
    00000030: 02 02 00 02 11 11 06 01 00 02 01 0a 62 64 00 07
    00000040: 05 03 00 03 00 03 00 00 03 02 03 02 00 02 0a 00
    00000050: 02 05 00 06 64 64 64 01 02 04 03 0d 02 02 01 02
    00000060: 07 02 02 00 00 07 03 04 03 01 04 03 03 03 00 03
    00000070: 06 04 04 01 02 03 00 02 02 01 11
and driver acknowledges with "aa 02".

All reads are coming from endpoint 0x82 and all writes go to endpoint 0x01.

The driver continuously submits read URBs to endpoint 0x82. Touchscreen 
answers after 1 second if there's no activity or immediately with touch data.


I did this (but I don't know much about USB programming). The initialization
seems to work (outputs firmware version and device name correctly). But
the device disconnects probably because of absent communication. The first
URB should be probably sent in nexio_init().
Also the usbtouchscreen tries to bind to both device interfaces and it fails 
the second time. How to solve this?

--- drivers/input/touchscreen/usbtouchscreen.c.orig	2009-09-10 
00:13:59.000000000 +0200
+++ drivers/input/touchscreen/usbtouchscreen.c	2009-11-09 14:39:48.000000000 
+0100
@@ -13,6 +13,7 @@
  *  - IdealTEK URTC1000
  *  - General Touch
  *  - GoTop Super_Q2/GogoPen/PenPower tablets
+ *  - NEXIO/iNexio
  *
  * Copyright (C) 2004-2007 by Daniel Ritz <daniel.ritz@gmx.ch>
  * Copyright (C) by Todd E. Johnson (mtouchusb.c)
@@ -118,6 +119,7 @@
 	DEVTYPE_IDEALTEK,
 	DEVTYPE_GENERAL_TOUCH,
 	DEVTYPE_GOTOP,
+	DEVTYPE_NEXIO,
 };
 
 #define USB_DEVICE_HID_CLASS(vend, prod) \
@@ -191,6 +193,11 @@
 	{USB_DEVICE(0x08f2, 0x00f4), .driver_info = DEVTYPE_GOTOP},
 #endif
 
+#ifdef CONFIG_TOUCHSCREEN_USB_NEXIO
+	{USB_DEVICE(0x10f0, 0x2002), .driver_info = DEVTYPE_NEXIO},
+	{USB_DEVICE(0x1870, 0x0001), .driver_info = DEVTYPE_NEXIO},
+#endif
+
 	{}
 };
 
@@ -563,6 +570,87 @@
 }
 #endif
 
+/*****************************************************************************
+ * NEXIO Part
+ */
+#ifdef CONFIG_TOUCHSCREEN_USB_NEXIO
+
+#define NEXIO_OUTPUT_EP	0x01
+#define NEXIO_INPUT_EP	0x82
+#define NEXIO_TIMEOUT	5000
+#define NEXIO_BUFSIZE	1024
+
+static int nexio_init(struct usbtouch_usb *usbtouch)
+{
+	struct usb_device *dev = usbtouch->udev;
+	int ret = -ENOMEM;
+	int actual_len;
+	unsigned char *buf;
+
+	buf = kmalloc(NEXIO_BUFSIZE, GFP_KERNEL);
+	if (!buf)
+		goto err_nobuf;
+	printk("1 read\n");
+	ret = usb_bulk_msg(dev, usb_rcvbulkpipe(dev, NEXIO_INPUT_EP), buf,
+			   NEXIO_BUFSIZE, &actual_len, NEXIO_TIMEOUT);
+	if (ret < 0)
+		goto err_out;
+	printk("2 read\n");
+	ret = usb_bulk_msg(dev, usb_rcvbulkpipe(dev, NEXIO_INPUT_EP), buf,
+			   NEXIO_BUFSIZE, &actual_len, NEXIO_TIMEOUT);
+	if (ret < 0)
+		goto err_out;
+	/* Send some command */
+	printk("3 write \n");
+	buf[0] = 0x82;
+	buf[1] = 0x04;
+	buf[2] = 0x0a;
+	buf[3] = 0x0f;
+	ret = usb_bulk_msg(dev, usb_sndbulkpipe(dev, NEXIO_OUTPUT_EP), buf, 4,
+			   &actual_len, NEXIO_TIMEOUT);
+	if (ret < 0)
+		goto err_out;
+	/* Read it back */
+	printk("4 read\n");
+	ret = usb_bulk_msg(dev, usb_rcvbulkpipe(dev, NEXIO_INPUT_EP), buf,
+			  NEXIO_BUFSIZE, &actual_len, NEXIO_TIMEOUT);
+	if (ret < 0)
+		goto err_out;
+	/* Read firmware version */
+	printk("5 read\n");
+	ret = usb_bulk_msg(dev, usb_rcvbulkpipe(dev, 0x82), buf, NEXIO_BUFSIZE,
+			   &actual_len, NEXIO_TIMEOUT);
+	if (ret < 0)
+		goto err_out;
+	buf[buf[1]] = 0;
+	printk("Firmware version %s\n", &buf[2]);
+	/* Read device name */
+	printk("6 read\n");
+	ret = usb_bulk_msg(dev, usb_rcvbulkpipe(dev, 0x82), buf, NEXIO_BUFSIZE,
+			   &actual_len, NEXIO_TIMEOUT);
+	if (ret < 0)
+		goto err_out;
+	buf[buf[1]] = 0;
+	printk("Device name %s\n", &buf[2]);
+	if (usb_submit_urb(usbtouch->irq, GFP_KERNEL))
+		return -EIO;
+err_out:
+	kfree(buf);
+err_nobuf:
+	return ret;
+}
+
+static int nexio_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
+{
+	int i;
+	printk("nexio_read_data: ");
+	for (i = 0; i < pkt[1]; i++)
+		printk("%02X", pkt[i]);
+
+	return 0;
+}
+#endif
+
 
 /*****************************************************************************
  * the different device descriptors
@@ -702,6 +790,18 @@
 		.read_data	= gotop_read_data,
 	},
 #endif
+
+#ifdef CONFIG_TOUCHSCREEN_USB_NEXIO
+	[DEVTYPE_NEXIO] = {
+		.min_xc		= 0x0,
+		.max_xc		= 0x03ff,
+		.min_yc		= 0x0,
+		.max_yc		= 0x03ff,
+		.rept_size	= 4,
+		.read_data	= nexio_read_data,
+		.init		= nexio_init,
+	},
+#endif
 };
 


-- 
Ondrej Zary