1 /******************************************************************************
2 * touchkitusb.c -- Driver for eGalax TouchKit USB Touchscreens
4 * Copyright (C) 2004 by Daniel Ritz
5 * Copyright (C) by Todd E. Johnson (mtouchusb.c)
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of the
10 * License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 * Based upon mtouchusb.c
23 *****************************************************************************/
27 #include <linux/config.h>
28 #include <linux/kernel.h>
29 #include <linux/slab.h>
30 #include <linux/input.h>
31 #include <linux/module.h>
32 #include <linux/init.h>
34 #if !defined(DEBUG) && defined(CONFIG_USB_DEBUG)
37 #include <linux/usb.h>
38 #include <linux/usb_input.h>
40 #define TOUCHKIT_MIN_XC 0x0
41 #define TOUCHKIT_MAX_XC 0x07ff
42 #define TOUCHKIT_XC_FUZZ 0x0
43 #define TOUCHKIT_XC_FLAT 0x0
44 #define TOUCHKIT_MIN_YC 0x0
45 #define TOUCHKIT_MAX_YC 0x07ff
46 #define TOUCHKIT_YC_FUZZ 0x0
47 #define TOUCHKIT_YC_FLAT 0x0
48 #define TOUCHKIT_REPORT_DATA_SIZE 8
50 #define TOUCHKIT_DOWN 0x01
51 #define TOUCHKIT_POINT_TOUCH 0x81
52 #define TOUCHKIT_POINT_NOTOUCH 0x80
54 #define TOUCHKIT_GET_TOUCHED(dat) ((((dat)[0]) & TOUCHKIT_DOWN) ? 1 : 0)
55 #define TOUCHKIT_GET_X(dat) (((dat)[3] << 7) | (dat)[4])
56 #define TOUCHKIT_GET_Y(dat) (((dat)[1] << 7) | (dat)[2])
58 #define DRIVER_VERSION "v0.1"
59 #define DRIVER_AUTHOR "Daniel Ritz <daniel.ritz@gmx.ch>"
60 #define DRIVER_DESC "eGalax TouchKit USB HID Touchscreen Driver"
63 module_param(swap_xy, bool, 0644);
64 MODULE_PARM_DESC(swap_xy, "If set X and Y axes are swapped.");
70 struct usb_device *udev;
71 struct input_dev *input;
76 static struct usb_device_id touchkit_devices[] = {
77 {USB_DEVICE(0x3823, 0x0001)},
78 {USB_DEVICE(0x0123, 0x0001)},
79 {USB_DEVICE(0x0eef, 0x0001)},
80 {USB_DEVICE(0x0eef, 0x0002)},
84 static void touchkit_irq(struct urb *urb, struct pt_regs *regs)
86 struct touchkit_usb *touchkit = urb->context;
90 switch (urb->status) {
95 /* this urb is timing out */
96 dbg("%s - urb timed out - was the device unplugged?",
102 /* this urb is terminated, clean up */
103 dbg("%s - urb shutting down with status: %d",
104 __FUNCTION__, urb->status);
107 dbg("%s - nonzero urb status received: %d",
108 __FUNCTION__, urb->status);
113 y = TOUCHKIT_GET_X(touchkit->data);
114 x = TOUCHKIT_GET_Y(touchkit->data);
116 x = TOUCHKIT_GET_X(touchkit->data);
117 y = TOUCHKIT_GET_Y(touchkit->data);
120 input_regs(touchkit->input, regs);
121 input_report_key(touchkit->input, BTN_TOUCH,
122 TOUCHKIT_GET_TOUCHED(touchkit->data));
123 input_report_abs(touchkit->input, ABS_X, x);
124 input_report_abs(touchkit->input, ABS_Y, y);
125 input_sync(touchkit->input);
128 retval = usb_submit_urb(urb, GFP_ATOMIC);
130 err("%s - usb_submit_urb failed with result: %d",
131 __FUNCTION__, retval);
134 static int touchkit_open(struct input_dev *input)
136 struct touchkit_usb *touchkit = input->private;
138 touchkit->irq->dev = touchkit->udev;
140 if (usb_submit_urb(touchkit->irq, GFP_ATOMIC))
146 static void touchkit_close(struct input_dev *input)
148 struct touchkit_usb *touchkit = input->private;
150 usb_kill_urb(touchkit->irq);
153 static int touchkit_alloc_buffers(struct usb_device *udev,
154 struct touchkit_usb *touchkit)
156 touchkit->data = usb_buffer_alloc(udev, TOUCHKIT_REPORT_DATA_SIZE,
157 SLAB_ATOMIC, &touchkit->data_dma);
165 static void touchkit_free_buffers(struct usb_device *udev,
166 struct touchkit_usb *touchkit)
169 usb_buffer_free(udev, TOUCHKIT_REPORT_DATA_SIZE,
170 touchkit->data, touchkit->data_dma);
173 static int touchkit_probe(struct usb_interface *intf,
174 const struct usb_device_id *id)
176 struct touchkit_usb *touchkit;
177 struct input_dev *input_dev;
178 struct usb_host_interface *interface;
179 struct usb_endpoint_descriptor *endpoint;
180 struct usb_device *udev = interface_to_usbdev(intf);
182 interface = intf->cur_altsetting;
183 endpoint = &interface->endpoint[0].desc;
185 touchkit = kzalloc(sizeof(struct touchkit_usb), GFP_KERNEL);
186 input_dev = input_allocate_device();
187 if (!touchkit || !input_dev)
190 if (touchkit_alloc_buffers(udev, touchkit))
193 touchkit->irq = usb_alloc_urb(0, GFP_KERNEL);
194 if (!touchkit->irq) {
195 dbg("%s - usb_alloc_urb failed: touchkit->irq", __FUNCTION__);
196 goto out_free_buffers;
199 touchkit->udev = udev;
200 touchkit->input = input_dev;
202 if (udev->manufacturer)
203 strlcpy(touchkit->name, udev->manufacturer, sizeof(touchkit->name));
206 if (udev->manufacturer)
207 strlcat(touchkit->name, " ", sizeof(touchkit->name));
208 strlcat(touchkit->name, udev->product, sizeof(touchkit->name));
211 if (!strlen(touchkit->name))
212 snprintf(touchkit->name, sizeof(touchkit->name),
213 "USB Touchscreen %04x:%04x",
214 le16_to_cpu(udev->descriptor.idVendor),
215 le16_to_cpu(udev->descriptor.idProduct));
217 usb_make_path(udev, touchkit->phys, sizeof(touchkit->phys));
218 strlcpy(touchkit->phys, "/input0", sizeof(touchkit->phys));
220 input_dev->name = touchkit->name;
221 input_dev->phys = touchkit->phys;
222 usb_to_input_id(udev, &input_dev->id);
223 input_dev->cdev.dev = &intf->dev;
224 input_dev->private = touchkit;
225 input_dev->open = touchkit_open;
226 input_dev->close = touchkit_close;
228 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
229 input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
230 input_set_abs_params(input_dev, ABS_X, TOUCHKIT_MIN_XC, TOUCHKIT_MAX_XC,
231 TOUCHKIT_XC_FUZZ, TOUCHKIT_XC_FLAT);
232 input_set_abs_params(input_dev, ABS_Y, TOUCHKIT_MIN_YC, TOUCHKIT_MAX_YC,
233 TOUCHKIT_YC_FUZZ, TOUCHKIT_YC_FLAT);
235 usb_fill_int_urb(touchkit->irq, touchkit->udev,
236 usb_rcvintpipe(touchkit->udev, 0x81),
237 touchkit->data, TOUCHKIT_REPORT_DATA_SIZE,
238 touchkit_irq, touchkit, endpoint->bInterval);
240 input_register_device(touchkit->input);
242 usb_set_intfdata(intf, touchkit);
246 touchkit_free_buffers(udev, touchkit);
248 input_free_device(input_dev);
253 static void touchkit_disconnect(struct usb_interface *intf)
255 struct touchkit_usb *touchkit = usb_get_intfdata(intf);
257 dbg("%s - called", __FUNCTION__);
262 dbg("%s - touchkit is initialized, cleaning up", __FUNCTION__);
263 usb_set_intfdata(intf, NULL);
264 usb_kill_urb(touchkit->irq);
265 input_unregister_device(touchkit->input);
266 usb_free_urb(touchkit->irq);
267 touchkit_free_buffers(interface_to_usbdev(intf), touchkit);
271 MODULE_DEVICE_TABLE(usb, touchkit_devices);
273 static struct usb_driver touchkit_driver = {
274 .owner = THIS_MODULE,
275 .name = "touchkitusb",
276 .probe = touchkit_probe,
277 .disconnect = touchkit_disconnect,
278 .id_table = touchkit_devices,
281 static int __init touchkit_init(void)
283 return usb_register(&touchkit_driver);
286 static void __exit touchkit_cleanup(void)
288 usb_deregister(&touchkit_driver);
291 module_init(touchkit_init);
292 module_exit(touchkit_cleanup);
294 MODULE_AUTHOR(DRIVER_AUTHOR);
295 MODULE_DESCRIPTION(DRIVER_DESC);
296 MODULE_LICENSE("GPL");