blob: 2a314b0659225cc4fff70fe716427027fdd06e4f [file] [log] [blame]
/******************************************************************************
* touchkitusb.c -- Driver for eGalax TouchKit USB Touchscreens
*
* Copyright (C) 2004-2005 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.
*
* Based upon mtouchusb.c
*
*****************************************************************************/
//#define DEBUG
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/usb/input.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 16
#define TOUCHKIT_DOWN 0x01
#define TOUCHKIT_PKT_TYPE_MASK 0xFE
#define TOUCHKIT_PKT_TYPE_REPT 0x80
#define TOUCHKIT_PKT_TYPE_DIAG 0x0A
#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;
char buffer[TOUCHKIT_REPORT_DATA_SIZE];
int buf_len;
struct urb *irq;
struct usb_device *udev;
struct input_dev *input;
char name[128];
char phys[64];
};
static struct usb_device_id touchkit_devices[] = {
{USB_DEVICE(0x3823, 0x0001)},
{USB_DEVICE(0x0123, 0x0001)},
{USB_DEVICE(0x0eef, 0x0001)},
{USB_DEVICE(0x0eef, 0x0002)},
{}
};
/* helpers to read the data */
static inline int touchkit_get_touched(char *data)
{
return (data[0] & TOUCHKIT_DOWN) ? 1 : 0;
}
static inline int touchkit_get_x(char *data)
{
return ((data[3] & 0x0F) << 7) | (data[4] & 0x7F);
}
static inline int touchkit_get_y(char *data)
{
return ((data[1] & 0x0F) << 7) | (data[2] & 0x7F);
}
/* processes one input packet. */
static void touchkit_process_pkt(struct touchkit_usb *touchkit, char *pkt)
{
int x, y;
/* only process report packets */
if ((pkt[0] & TOUCHKIT_PKT_TYPE_MASK) != TOUCHKIT_PKT_TYPE_REPT)
return;
if (swap_xy) {
y = touchkit_get_x(pkt);
x = touchkit_get_y(pkt);
} else {
x = touchkit_get_x(pkt);
y = touchkit_get_y(pkt);
}
input_report_key(touchkit->input, BTN_TOUCH, touchkit_get_touched(pkt));
input_report_abs(touchkit->input, ABS_X, x);
input_report_abs(touchkit->input, ABS_Y, y);
input_sync(touchkit->input);
}
static int touchkit_get_pkt_len(char *buf)
{
switch (buf[0] & TOUCHKIT_PKT_TYPE_MASK) {
case TOUCHKIT_PKT_TYPE_REPT:
return 5;
case TOUCHKIT_PKT_TYPE_DIAG:
return buf[1] + 2;
}
return 0;
}
static void touchkit_process(struct touchkit_usb *touchkit, int len)
{
char *buffer;
int pkt_len, buf_len, pos;
/* if the buffer contains data, append */
if (unlikely(touchkit->buf_len)) {
int tmp;
/* if only 1 byte in buffer, add another one to get length */
if (touchkit->buf_len == 1)
touchkit->buffer[1] = touchkit->data[0];
pkt_len = touchkit_get_pkt_len(touchkit->buffer);
/* unknown packet: drop everything */
if (!pkt_len)
return;
/* append, process */
tmp = pkt_len - touchkit->buf_len;
memcpy(touchkit->buffer + touchkit->buf_len, touchkit->data, tmp);
touchkit_process_pkt(touchkit, touchkit->buffer);
buffer = touchkit->data + tmp;
buf_len = len - tmp;
} else {
buffer = touchkit->data;
buf_len = len;
}
/* only one byte left in buffer */
if (unlikely(buf_len == 1)) {
touchkit->buffer[0] = buffer[0];
touchkit->buf_len = 1;
return;
}
/* loop over the buffer */
pos = 0;
while (pos < buf_len) {
/* get packet len */
pkt_len = touchkit_get_pkt_len(buffer + pos);
/* unknown packet: drop everything */
if (unlikely(!pkt_len))
return;
/* full packet: process */
if (likely(pkt_len <= buf_len)) {
touchkit_process_pkt(touchkit, buffer + pos);
} else {
/* incomplete packet: save in buffer */
memcpy(touchkit->buffer, buffer + pos, buf_len - pos);
touchkit->buf_len = buf_len - pos;
}
pos += pkt_len;
}
}
static void touchkit_irq(struct urb *urb)
{
struct touchkit_usb *touchkit = 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?",
__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;
}
touchkit_process(touchkit, urb->actual_length);
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;
touchkit->irq->dev = touchkit->udev;
if (usb_submit_urb(touchkit->irq, GFP_ATOMIC))
return -EIO;
return 0;
}
static void touchkit_close(struct input_dev *input)
{
struct touchkit_usb *touchkit = input->private;
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,
GFP_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)
{
struct touchkit_usb *touchkit;
struct input_dev *input_dev;
struct usb_host_interface *interface;
struct usb_endpoint_descriptor *endpoint;
struct usb_device *udev = interface_to_usbdev(intf);
interface = intf->cur_altsetting;
endpoint = &interface->endpoint[0].desc;
touchkit = kzalloc(sizeof(struct touchkit_usb), GFP_KERNEL);
input_dev = input_allocate_device();
if (!touchkit || !input_dev)
goto out_free;
if (touchkit_alloc_buffers(udev, touchkit))
goto out_free;
touchkit->irq = usb_alloc_urb(0, GFP_KERNEL);
if (!touchkit->irq) {
dbg("%s - usb_alloc_urb failed: touchkit->irq", __FUNCTION__);
goto out_free_buffers;
}
touchkit->udev = udev;
touchkit->input = input_dev;
if (udev->manufacturer)
strlcpy(touchkit->name, udev->manufacturer, sizeof(touchkit->name));
if (udev->product) {
if (udev->manufacturer)
strlcat(touchkit->name, " ", sizeof(touchkit->name));
strlcat(touchkit->name, udev->product, sizeof(touchkit->name));
}
if (!strlen(touchkit->name))
snprintf(touchkit->name, sizeof(touchkit->name),
"USB Touchscreen %04x:%04x",
le16_to_cpu(udev->descriptor.idVendor),
le16_to_cpu(udev->descriptor.idProduct));
usb_make_path(udev, touchkit->phys, sizeof(touchkit->phys));
strlcpy(touchkit->phys, "/input0", sizeof(touchkit->phys));
input_dev->name = touchkit->name;
input_dev->phys = touchkit->phys;
usb_to_input_id(udev, &input_dev->id);
input_dev->cdev.dev = &intf->dev;
input_dev->private = touchkit;
input_dev->open = touchkit_open;
input_dev->close = touchkit_close;
input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
input_set_abs_params(input_dev, ABS_X, TOUCHKIT_MIN_XC, TOUCHKIT_MAX_XC,
TOUCHKIT_XC_FUZZ, TOUCHKIT_XC_FLAT);
input_set_abs_params(input_dev, ABS_Y, TOUCHKIT_MIN_YC, TOUCHKIT_MAX_YC,
TOUCHKIT_YC_FUZZ, TOUCHKIT_YC_FLAT);
usb_fill_int_urb(touchkit->irq, touchkit->udev,
usb_rcvintpipe(touchkit->udev, 0x81),
touchkit->data, TOUCHKIT_REPORT_DATA_SIZE,
touchkit_irq, touchkit, endpoint->bInterval);
touchkit->irq->transfer_dma = touchkit->data_dma;
touchkit->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
input_register_device(touchkit->input);
usb_set_intfdata(intf, touchkit);
return 0;
out_free_buffers:
touchkit_free_buffers(udev, touchkit);
out_free:
input_free_device(input_dev);
kfree(touchkit);
return -ENOMEM;
}
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);
usb_kill_urb(touchkit->irq);
input_unregister_device(touchkit->input);
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 = {
.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");