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/******************************************************************************
* touchkitusb.c -- Driver for eGalax TouchKit USB Touchscreens
*
* Copyright (C) 2004 by Daniel Ritz
* 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.
*
* Based upon mtouchusb.c
*
*****************************************************************************/
//#define DEBUG
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/init.h>
#if !defined(DEBUG) && defined(CONFIG_USB_DEBUG)
#define DEBUG
#endif
#include <linux/usb.h>
#define TOUCHKIT_MIN_XC 0x0
#define TOUCHKIT_MAX_XC 0x07ff
#define TOUCHKIT_XC_FUZZ 0x0
#define TOUCHKIT_XC_FLAT 0x0
#define TOUCHKIT_MIN_YC 0x0
#define TOUCHKIT_MAX_YC 0x07ff
#define TOUCHKIT_YC_FUZZ 0x0
#define TOUCHKIT_YC_FLAT 0x0
#define TOUCHKIT_REPORT_DATA_SIZE 8
#define TOUCHKIT_DOWN 0x01
#define TOUCHKIT_POINT_TOUCH 0x81
#define TOUCHKIT_POINT_NOTOUCH 0x80
#define TOUCHKIT_GET_TOUCHED(dat) ((((dat)[0]) & TOUCHKIT_DOWN) ? 1 : 0)
#define TOUCHKIT_GET_X(dat) (((dat)[3] << 7) | (dat)[4])
#define TOUCHKIT_GET_Y(dat) (((dat)[1] << 7) | (dat)[2])
#define DRIVER_VERSION "v0.1"
#define DRIVER_AUTHOR "Daniel Ritz <daniel.ritz@gmx.ch>"
#define DRIVER_DESC "eGalax TouchKit USB HID 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.");
struct touchkit_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 touchkit_devices[] = {
{USB_DEVICE(0x3823, 0x0001)},
{USB_DEVICE(0x0eef, 0x0001)},
{}
};
static void touchkit_irq(struct urb *urb, struct pt_regs *regs)
{
struct touchkit_usb *touchkit = urb->context;
int retval;
int x, y;
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;
}
if (swap_xy) {
y = TOUCHKIT_GET_X(touchkit->data);
x = TOUCHKIT_GET_Y(touchkit->data);
} else {
x = TOUCHKIT_GET_X(touchkit->data);
y = TOUCHKIT_GET_Y(touchkit->data);
}
input_regs(&touchkit->input, regs);
input_report_key(&touchkit->input, BTN_TOUCH,
TOUCHKIT_GET_TOUCHED(touchkit->data));
input_report_abs(&touchkit->input, ABS_X, x);
input_report_abs(&touchkit->input, ABS_Y, y);
input_sync(&touchkit->input);
exit:
retval = usb_submit_urb(urb, GFP_ATOMIC);
if (retval)
err("%s - usb_submit_urb failed with result: %d",
__FUNCTION__, retval);
}
static int touchkit_open(struct input_dev *input)
{
struct touchkit_usb *touchkit = input->private;
if (touchkit->open++)
return 0;
touchkit->irq->dev = touchkit->udev;
if (usb_submit_urb(touchkit->irq, GFP_ATOMIC)) {
touchkit->open--;
return -EIO;
}
return 0;
}
static void touchkit_close(struct input_dev *input)
{
struct touchkit_usb *touchkit = input->private;
if (!--touchkit->open)
usb_kill_urb(touchkit->irq);
}
static int touchkit_alloc_buffers(struct usb_device *udev,
struct touchkit_usb *touchkit)
{
touchkit->data = usb_buffer_alloc(udev, TOUCHKIT_REPORT_DATA_SIZE,
SLAB_ATOMIC, &touchkit->data_dma);
if (!touchkit->data)
return -1;
return 0;
}
static void touchkit_free_buffers(struct usb_device *udev,
struct touchkit_usb *touchkit)
{
if (touchkit->data)
usb_buffer_free(udev, TOUCHKIT_REPORT_DATA_SIZE,
touchkit->data, touchkit->data_dma);
}
static int touchkit_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
int ret;
struct touchkit_usb *touchkit;
struct usb_host_interface *interface;
struct usb_endpoint_descriptor *endpoint;
struct usb_device *udev = interface_to_usbdev(intf);
char path[64];
interface = intf->cur_altsetting;
endpoint = &interface->endpoint[0].desc;
touchkit = kmalloc(sizeof(struct touchkit_usb), GFP_KERNEL);
if (!touchkit)
return -ENOMEM;
memset(touchkit, 0, sizeof(struct touchkit_usb));
touchkit->udev = udev;
if (touchkit_alloc_buffers(udev, touchkit)) {
ret = -ENOMEM;
goto out_free;
}
touchkit->input.private = touchkit;
touchkit->input.open = touchkit_open;
touchkit->input.close = touchkit_close;
usb_make_path(udev, path, 64);
sprintf(touchkit->phys, "%s/input0", path);
touchkit->input.name = touchkit->name;
touchkit->input.phys = touchkit->phys;
touchkit->input.id.bustype = BUS_USB;
touchkit->input.id.vendor = le16_to_cpu(udev->descriptor.idVendor);
touchkit->input.id.product = le16_to_cpu(udev->descriptor.idProduct);
touchkit->input.id.version = le16_to_cpu(udev->descriptor.bcdDevice);
touchkit->input.dev = &intf->dev;
touchkit->input.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
touchkit->input.absbit[0] = BIT(ABS_X) | BIT(ABS_Y);
touchkit->input.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
/* Used to Scale Compensated Data */
touchkit->input.absmin[ABS_X] = TOUCHKIT_MIN_XC;
touchkit->input.absmax[ABS_X] = TOUCHKIT_MAX_XC;
touchkit->input.absfuzz[ABS_X] = TOUCHKIT_XC_FUZZ;
touchkit->input.absflat[ABS_X] = TOUCHKIT_XC_FLAT;
touchkit->input.absmin[ABS_Y] = TOUCHKIT_MIN_YC;
touchkit->input.absmax[ABS_Y] = TOUCHKIT_MAX_YC;
touchkit->input.absfuzz[ABS_Y] = TOUCHKIT_YC_FUZZ;
touchkit->input.absflat[ABS_Y] = TOUCHKIT_YC_FLAT;
if (udev->manufacturer)
strcat(touchkit->name, udev->manufacturer);
if (udev->product)
sprintf(touchkit->name, "%s %s", touchkit->name, udev->product);
if (!strlen(touchkit->name))
sprintf(touchkit->name, "USB Touchscreen %04x:%04x",
touchkit->input.id.vendor, touchkit->input.id.product);
touchkit->irq = usb_alloc_urb(0, GFP_KERNEL);
if (!touchkit->irq) {
dbg("%s - usb_alloc_urb failed: touchkit->irq", __FUNCTION__);
ret = -ENOMEM;
goto out_free_buffers;
}
usb_fill_int_urb(touchkit->irq, touchkit->udev,
usb_rcvintpipe(touchkit->udev, 0x81),
touchkit->data, TOUCHKIT_REPORT_DATA_SIZE,
touchkit_irq, touchkit, endpoint->bInterval);
input_register_device(&touchkit->input);
printk(KERN_INFO "input: %s on %s\n", touchkit->name, path);
usb_set_intfdata(intf, touchkit);
return 0;
out_free_buffers:
touchkit_free_buffers(udev, touchkit);
out_free:
kfree(touchkit);
return ret;
}
static void touchkit_disconnect(struct usb_interface *intf)
{
struct touchkit_usb *touchkit = usb_get_intfdata(intf);
dbg("%s - called", __FUNCTION__);
if (!touchkit)
return;
dbg("%s - touchkit is initialized, cleaning up", __FUNCTION__);
usb_set_intfdata(intf, NULL);
input_unregister_device(&touchkit->input);
usb_kill_urb(touchkit->irq);
usb_free_urb(touchkit->irq);
touchkit_free_buffers(interface_to_usbdev(intf), touchkit);
kfree(touchkit);
}
MODULE_DEVICE_TABLE(usb, touchkit_devices);
static struct usb_driver touchkit_driver = {
.owner = THIS_MODULE,
.name = "touchkitusb",
.probe = touchkit_probe,
.disconnect = touchkit_disconnect,
.id_table = touchkit_devices,
};
static int __init touchkit_init(void)
{
return usb_register(&touchkit_driver);
}
static void __exit touchkit_cleanup(void)
{
usb_deregister(&touchkit_driver);
}
module_init(touchkit_init);
module_exit(touchkit_cleanup);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
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