/******************************************************************************
* itmtouch.c -- Driver for ITM touchscreen panel
*
* 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.
*
* Based upon original work by Chris Collins <xfire-itmtouch@xware.cx>.
*
* Kudos to ITM for providing me with the datasheet for the panel,
* even though it was a day later than I had finished writing this
* driver.
*
* It has meant that I've been able to correct my interpretation of the
* protocol packets however.
*
* CC -- 2003/9/29
*
* History
* 1.0 & 1.1 2003 (CC) vojtech@suse.cz
* Original version for 2.4.x kernels
*
* 1.2 02/03/2005 (HCE) hc@mivu.no
* Complete rewrite to support Linux 2.6.10, thanks to mtouchusb.c for hints.
* Unfortunately no calibration support at this time.
*
* 1.2.1 09/03/2005 (HCE) hc@mivu.no
* Code cleanup and adjusting syntax to start matching kernel standards
*
* 1.2.2 10/05/2006 (MJA) massad@gmail.com
* Flag for detecting if the screen was being touch was incorrectly
* inverted, so no touch events were being detected.
*
*****************************************************************************/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/usb/input.h>
/* only an 8 byte buffer necessary for a single packet */
#define ITM_BUFSIZE 8
#define PATH_SIZE 64
#define USB_VENDOR_ID_ITMINC 0x0403
#define USB_PRODUCT_ID_TOUCHPANEL 0xf9e9
#define DRIVER_AUTHOR "Hans-Christian Egtvedt <hc@mivu.no>"
#define DRIVER_VERSION "v1.2.2"
#define DRIVER_DESC "USB ITM Inc Touch Panel Driver"
#define DRIVER_LICENSE "GPL"
MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_LICENSE( DRIVER_LICENSE );
struct itmtouch_dev {
struct usb_device *usbdev; /* usb device */
struct input_dev *inputdev; /* input device */
struct urb *readurb; /* urb */
char rbuf[ITM_BUFSIZE]; /* data */
int users;
char name[128];
char phys[64];
};
static struct usb_device_id itmtouch_ids [] = {
{ USB_DEVICE(USB_VENDOR_ID_ITMINC, USB_PRODUCT_ID_TOUCHPANEL) },
{ }
};
static void itmtouch_irq(struct urb *urb)
{
struct itmtouch_dev *itmtouch = urb->context;
unsigned char *data = urb->transfer_buffer;
struct input_dev *dev = itmtouch->inputdev;
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?",
__FUNCTION__);
return;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dbg("%s - urb shutting down with status: %d",
__FUNCTION__, urb->status);
return;
default:
dbg("%s - nonzero urb status received: %d",
__FUNCTION__, urb->status);
goto exit;
}
/* if pressure has been released, then don't report X/Y */
if (!(data[7] & 0x20)) {
input_report_abs(dev, ABS_X, (data[0] & 0x1F) << 7 | (data[3] & 0x7F));
input_report_abs(dev, ABS_Y, (data[1] & 0x1F) << 7 | (data[4] & 0x7F));
}
input_report_abs(dev, ABS_PRESSURE, (data[2] & 1) << 7 | (data[5] & 0x7F));
input_report_key(dev, BTN_TOUCH, ~data[7] & 0x20);
input_sync(dev);
exit:
retval = usb_submit_urb (urb, GFP_ATOMIC);
if (retval)
printk(KERN_ERR "%s - usb_submit_urb failed with result: %d",
__FUNCTION__, retval);
}
static int itmtouch_open(struct input_dev *input)
{
struct itmtouch_dev *itmtouch = input->private;
itmtouch->readurb->dev = itmtouch->usbdev;
if (usb_submit_urb(itmtouch->readurb, GFP_KERNEL))
return -EIO;
return 0;
}
static void itmtouch_close(struct input_dev *input)
{
struct itmtouch_dev *itmtouch = input->private;
usb_kill_urb(itmtouch->readurb);
}
static int itmtouch_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
struct itmtouch_dev *itmtouch;
struct input_dev *input_dev;
struct usb_host_interface *interface;
struct usb_endpoint_descriptor *endpoint;
struct usb_device *udev = interface_to_usbdev(intf);
unsigned int pipe;
unsigned int maxp;
interface = intf->cur_altsetting;
endpoint = &interface->endpoint[0].desc;
itmtouch = kzalloc(sizeof(struct itmtouch_dev), GFP_KERNEL);
input_dev = input_allocate_device();
if (!itmtouch || !input_dev) {
err("%s - Out of memory.", __FUNCTION__);
goto fail;
}
itmtouch->usbdev = udev;
itmtouch->inputdev = input_dev;
if (udev->manufacturer)
strlcpy(itmtouch->name, udev->manufacturer, sizeof(itmtouch->name));
if (udev->product) {
if (udev->manufacturer)
strlcat(itmtouch->name, " ", sizeof(itmtouch->name));
strlcat(itmtouch->name, udev->product, sizeof(itmtouch->name));
}
if (!strlen(itmtouch->name))
sprintf(itmtouch->name, "USB ITM touchscreen");
usb_make_path(udev, itmtouch->phys, sizeof(itmtouch->phys));
strlcpy(itmtouch->phys, "/input0", sizeof(itmtouch->phys));
input_dev->name = itmtouch->name;
input_dev->phys = itmtouch->phys;
usb_to_input_id(udev, &input_dev->id);
input_dev->cdev.dev = &intf->dev;
input_dev->private = itmtouch;
input_dev->open = itmtouch_open;
input_dev->close = itmtouch_close;
input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
input_dev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE);
input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
/* device limits */
/* as specified by the ITM datasheet, X and Y are 12bit,
* Z (pressure) is 8 bit. However, the fields are defined up
* to 14 bits for future possible expansion.
*/
input_set_abs_params(input_dev, ABS_X, 0, 0x0FFF, 2, 0);
input_set_abs_params(input_dev, ABS_Y, 0, 0x0FFF, 2, 0);
input_set_abs_params(input_dev, ABS_PRESSURE, 0, 0xFF, 2, 0);
/* initialise the URB so we can read from the transport stream */
pipe = usb_rcvintpipe(itmtouch->usbdev, endpoint->bEndpointAddress);
maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
if (maxp > ITM_BUFSIZE)
maxp = ITM_BUFSIZE;
itmtouch->readurb = usb_alloc_urb(0, GFP_KERNEL);
if (!itmtouch->readurb) {
dbg("%s - usb_alloc_urb failed: itmtouch->readurb", __FUNCTION__);
goto fail;
}
usb_fill_int_urb(itmtouch->readurb, itmtouch->usbdev, pipe, itmtouch->rbuf,
maxp, itmtouch_irq, itmtouch, endpoint->bInterval);
input_register_device(itmtouch->inputdev);
usb_set_intfdata(intf, itmtouch);
return 0;
fail: input_free_device(input_dev);
kfree(itmtouch);
return -ENOMEM;
}
static void itmtouch_disconnect(struct usb_interface *intf)
{
struct itmtouch_dev *itmtouch = usb_get_intfdata(intf);
usb_set_intfdata(intf, NULL);
if (itmtouch) {
input_unregister_device(itmtouch->inputdev);
usb_kill_urb(itmtouch->readurb);
usb_free_urb(itmtouch->readurb);
kfree(itmtouch);
}
}
MODULE_DEVICE_TABLE(usb, itmtouch_ids);
static struct usb_driver itmtouch_driver = {
.name = "itmtouch",
.probe = itmtouch_probe,
.disconnect = itmtouch_disconnect,
.id_table = itmtouch_ids,
};
static int __init itmtouch_init(void)
{
info(DRIVER_DESC " " DRIVER_VERSION);
info(DRIVER_AUTHOR);
return usb_register(&itmtouch_driver);
}
static void __exit itmtouch_exit(void)
{
usb_deregister(&itmtouch_driver);
}
module_init(itmtouch_init);
module_exit(itmtouch_exit);
