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* mtouchusb.c -- Driver for Microtouch (Now 3M) USB Touchscreens
*
* 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 Radoslaw Garbacz (usb-support@ite.pl)
* (http://freshmeat.net/projects/3mtouchscreendriver)
*
* History
*
* 0.3 & 0.4 2002 (TEJ) tejohnson@yahoo.com
* Updated to 2.4.18, then 2.4.19
* Old version still relied on stealing a minor
*
* 0.5 02/26/2004 (TEJ) tejohnson@yahoo.com
* Complete rewrite using Linux Input in 2.6.3
* Unfortunately no calibration support at this time
*
* 1.4 04/25/2004 (TEJ) tejohnson@yahoo.com
* Changed reset from standard USB dev reset to vendor reset
* Changed data sent to host from compensated to raw coordinates
* Eliminated vendor/product module params
* Performed multiple successful tests with an EXII-5010UC
*
* 1.5 02/27/2005 ddstreet@ieee.org
* Added module parameter to select raw or hw-calibrated coordinate reporting
*
*****************************************************************************/
#include <linux/config.h>
#ifdef CONFIG_USB_DEBUG
#define DEBUG
#else
#undef DEBUG
#endif
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/usb.h>
#define MTOUCHUSB_MIN_XC 0x0
#define MTOUCHUSB_MAX_RAW_XC 0x4000
#define MTOUCHUSB_MAX_CALIB_XC 0xffff
#define MTOUCHUSB_XC_FUZZ 0x0
#define MTOUCHUSB_XC_FLAT 0x0
#define MTOUCHUSB_MIN_YC 0x0
#define MTOUCHUSB_MAX_RAW_YC 0x4000
#define MTOUCHUSB_MAX_CALIB_YC 0xffff
#define MTOUCHUSB_YC_FUZZ 0x0
#define MTOUCHUSB_YC_FLAT 0x0
#define MTOUCHUSB_ASYNC_REPORT 1
#define MTOUCHUSB_RESET 7
#define MTOUCHUSB_REPORT_DATA_SIZE 11
#define MTOUCHUSB_REQ_CTRLLR_ID 10
#define MTOUCHUSB_GET_RAW_XC(data) (data[8]<<8 | data[7])
#define MTOUCHUSB_GET_CALIB_XC(data) (data[4]<<8 | data[3])
#define MTOUCHUSB_GET_RAW_YC(data) (data[10]<<8 | data[9])
#define MTOUCHUSB_GET_CALIB_YC(data) (data[6]<<8 | data[5])
#define MTOUCHUSB_GET_XC(data) (raw_coordinates ? \
MTOUCHUSB_GET_RAW_XC(data) : \
MTOUCHUSB_GET_CALIB_XC(data))
#define MTOUCHUSB_GET_YC(data) (raw_coordinates ? \
MTOUCHUSB_GET_RAW_YC(data) : \
MTOUCHUSB_GET_CALIB_YC(data))
#define MTOUCHUSB_GET_TOUCHED(data) ((data[2] & 0x40) ? 1:0)
#define DRIVER_VERSION "v1.5"
#define DRIVER_AUTHOR "Todd E. Johnson, tejohnson@yahoo.com"
#define DRIVER_DESC "3M USB Touchscreen Driver"
#define DRIVER_LICENSE "GPL"
static int raw_coordinates = 1;
module_param(raw_coordinates, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(raw_coordinates, "report raw coordinate values (y, default) or hardware-calibrated coordinate values (n)");
struct mtouch_usb {
unsigned char *data;
dma_addr_t data_dma;
struct urb *irq;
struct usb_device *udev;
struct input_dev input;
int open;
char name[128];
char phys[64];
};
static struct usb_device_id mtouchusb_devices [] = {
{ USB_DEVICE(0x0596, 0x0001) },
{ }
};
static void mtouchusb_irq(struct urb *urb, struct pt_regs *regs)
{
struct mtouch_usb *mtouch = urb->context;
int retval;
switch (urb->status) {
case 0:
/* success */
break;
case -ETIMEDOUT:
/* 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;
}
input_regs(&mtouch->input, regs);
input_report_key(&mtouch->input, BTN_TOUCH,
MTOUCHUSB_GET_TOUCHED(mtouch->data));
input_report_abs(&mtouch->input, ABS_X,
MTOUCHUSB_GET_XC(mtouch->data));
input_report_abs(&mtouch->input, ABS_Y,
(raw_coordinates ? MTOUCHUSB_MAX_RAW_YC : MTOUCHUSB_MAX_CALIB_YC)
- MTOUCHUSB_GET_YC(mtouch->data));
input_sync(&mtouch->input);
exit:
retval = usb_submit_urb (urb, GFP_ATOMIC);
if (retval)
err ("%s - usb_submit_urb failed with result: %d",
__FUNCTION__, retval);
}
static int mtouchusb_open (struct input_dev *input)
{
struct mtouch_usb *mtouch = input->private;
if (mtouch->open++)
return 0;
mtouch->irq->dev = mtouch->udev;
if (usb_submit_urb (mtouch->irq, GFP_ATOMIC)) {
mtouch->open--;
return -EIO;
}
return 0;
}
static void mtouchusb_close (struct input_dev *input)
{
struct mtouch_usb *mtouch = input->private;
if (!--mtouch->open)
usb_kill_urb (mtouch->irq);
}
static int mtouchusb_alloc_buffers(struct usb_device *udev, struct mtouch_usb *mtouch)
{
dbg("%s - called", __FUNCTION__);
mtouch->data = usb_buffer_alloc(udev, MTOUCHUSB_REPORT_DATA_SIZE,
SLAB_ATOMIC, &mtouch->data_dma);
if (!mtouch->data)
return -1;
return 0;
}
static void mtouchusb_free_buffers(struct usb_device *udev, struct mtouch_usb *mtouch)
{
dbg("%s - called", __FUNCTION__);
if (mtouch->data)
usb_buffer_free(udev, MTOUCHUSB_REPORT_DATA_SIZE,
mtouch->data, mtouch->data_dma);
}
static int mtouchusb_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
struct mtouch_usb *mtouch;
struct usb_host_interface *interface;
struct usb_endpoint_descriptor *endpoint;
struct usb_device *udev = interface_to_usbdev (intf);
char path[64];
int nRet;
dbg("%s - called", __FUNCTION__);
dbg("%s - setting interface", __FUNCTION__);
interface = intf->cur_altsetting;
dbg("%s - setting endpoint", __FUNCTION__);
endpoint = &interface->endpoint[0].desc;
if (!(mtouch = kmalloc (sizeof (struct mtouch_usb), GFP_KERNEL))) {
err("%s - Out of memory.", __FUNCTION__);
return -ENOMEM;
}
memset(mtouch, 0, sizeof(struct mtouch_usb));
mtouch->udev = udev;
dbg("%s - allocating buffers", __FUNCTION__);
if (mtouchusb_alloc_buffers(udev, mtouch)) {
mtouchusb_free_buffers(udev, mtouch);
kfree(mtouch);
return -ENOMEM;
}
mtouch->input.private = mtouch;
mtouch->input.open = mtouchusb_open;
mtouch->input.close = mtouchusb_close;
usb_make_path(udev, path, 64);
sprintf(mtouch->phys, "%s/input0", path);
mtouch->input.name = mtouch->name;
mtouch->input.phys = mtouch->phys;
mtouch->input.id.bustype = BUS_USB;
mtouch->input.id.vendor = le16_to_cpu(udev->descriptor.idVendor);
mtouch->input.id.product = le16_to_cpu(udev->descriptor.idProduct);
mtouch->input.id.version = le16_to_cpu(udev->descriptor.bcdDevice);
mtouch->input.dev = &intf->dev;
mtouch->input.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
mtouch->input.absbit[0] = BIT(ABS_X) | BIT(ABS_Y);
mtouch->input.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
/* Used to Scale Compensated Data and Flip Y */
mtouch->input.absmin[ABS_X] = MTOUCHUSB_MIN_XC;
mtouch->input.absmax[ABS_X] = raw_coordinates ? \
MTOUCHUSB_MAX_RAW_XC : MTOUCHUSB_MAX_CALIB_XC;
mtouch->input.absfuzz[ABS_X] = MTOUCHUSB_XC_FUZZ;
mtouch->input.absflat[ABS_X] = MTOUCHUSB_XC_FLAT;
mtouch->input.absmin[ABS_Y] = MTOUCHUSB_MIN_YC;
mtouch->input.absmax[ABS_Y] = raw_coordinates ? \
MTOUCHUSB_MAX_RAW_YC : MTOUCHUSB_MAX_CALIB_YC;
mtouch->input.absfuzz[ABS_Y] = MTOUCHUSB_YC_FUZZ;
mtouch->input.absflat[ABS_Y] = MTOUCHUSB_YC_FLAT;
if (udev->manufacturer)
strcat(mtouch->name, udev->manufacturer);
if (udev->product)
sprintf(mtouch->name, "%s %s", mtouch->name, udev->product);
if (!strlen(mtouch->name))
sprintf(mtouch->name, "USB Touchscreen %04x:%04x",
mtouch->input.id.vendor, mtouch->input.id.product);
nRet = usb_control_msg(mtouch->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",
__FUNCTION__, nRet);
dbg("%s - usb_alloc_urb: mtouch->irq", __FUNCTION__);
mtouch->irq = usb_alloc_urb(0, GFP_KERNEL);
if (!mtouch->irq) {
dbg("%s - usb_alloc_urb failed: mtouch->irq", __FUNCTION__);
mtouchusb_free_buffers(udev, mtouch);
kfree(mtouch);
return -ENOMEM;
}
dbg("%s - usb_fill_int_urb", __FUNCTION__);
usb_fill_int_urb(mtouch->irq,
mtouch->udev,
usb_rcvintpipe(mtouch->udev, 0x81),
mtouch->data,
MTOUCHUSB_REPORT_DATA_SIZE,
mtouchusb_irq,
mtouch,
endpoint->bInterval);
dbg("%s - input_register_device", __FUNCTION__);
input_register_device(&mtouch->input);
nRet = usb_control_msg(mtouch->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",
__FUNCTION__, nRet);
printk(KERN_INFO "input: %s on %s\n", mtouch->name, path);
usb_set_intfdata(intf, mtouch);
return 0;
}
static void mtouchusb_disconnect(struct usb_interface *intf)
{
struct mtouch_usb *mtouch = usb_get_intfdata (intf);
dbg("%s - called", __FUNCTION__);
usb_set_intfdata(intf, NULL);
if (mtouch) {
dbg("%s - mtouch is initialized, cleaning up", __FUNCTION__);
usb_kill_urb(mtouch->irq);
input_unregister_device(&mtouch->input);
usb_free_urb(mtouch->irq);
mtouchusb_free_buffers(interface_to_usbdev(intf), mtouch);
kfree(mtouch);
}
}
MODULE_DEVICE_TABLE (usb, mtouchusb_devices);
static struct usb_driver mtouchusb_driver = {
.owner = THIS_MODULE,
.name = "mtouchusb",
.probe = mtouchusb_probe,
.disconnect = mtouchusb_disconnect,
.id_table = mtouchusb_devices,
};
static int __init mtouchusb_init(void) {
dbg("%s - called", __FUNCTION__);
return usb_register(&mtouchusb_driver);
}
static void __exit mtouchusb_cleanup(void) {
dbg("%s - called", __FUNCTION__);
usb_deregister(&mtouchusb_driver);
}
module_init(mtouchusb_init);
module_exit(mtouchusb_cleanup);
MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_LICENSE("GPL");
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