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linux
1/******************************************************************************
2 * touchkitusb.c -- Driver for eGalax TouchKit USB Touchscreens
3 *
4 * Copyright (C) 2004 by Daniel Ritz
5 * Copyright (C) by Todd E. Johnson (mtouchusb.c)
6 *
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.
11 *
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.
16 *
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.
20 *
21 * Based upon mtouchusb.c
22 *
23 *****************************************************************************/
24
25//#define DEBUG
26
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>
33#include <linux/usb.h>
34#include <linux/usb_input.h>
35
36#define TOUCHKIT_MIN_XC 0x0
37#define TOUCHKIT_MAX_XC 0x07ff
38#define TOUCHKIT_XC_FUZZ 0x0
39#define TOUCHKIT_XC_FLAT 0x0
40#define TOUCHKIT_MIN_YC 0x0
41#define TOUCHKIT_MAX_YC 0x07ff
42#define TOUCHKIT_YC_FUZZ 0x0
43#define TOUCHKIT_YC_FLAT 0x0
44#define TOUCHKIT_REPORT_DATA_SIZE 8
45
46#define TOUCHKIT_DOWN 0x01
47#define TOUCHKIT_POINT_TOUCH 0x81
48#define TOUCHKIT_POINT_NOTOUCH 0x80
49
50#define TOUCHKIT_GET_TOUCHED(dat) ((((dat)[0]) & TOUCHKIT_DOWN) ? 1 : 0)
51#define TOUCHKIT_GET_X(dat) (((dat)[3] << 7) | (dat)[4])
52#define TOUCHKIT_GET_Y(dat) (((dat)[1] << 7) | (dat)[2])
53
54#define DRIVER_VERSION "v0.1"
55#define DRIVER_AUTHOR "Daniel Ritz <daniel.ritz@gmx.ch>"
56#define DRIVER_DESC "eGalax TouchKit USB HID Touchscreen Driver"
57
58static int swap_xy;
59module_param(swap_xy, bool, 0644);
60MODULE_PARM_DESC(swap_xy, "If set X and Y axes are swapped.");
61
62struct touchkit_usb {
63 unsigned char *data;
64 dma_addr_t data_dma;
65 struct urb *irq;
66 struct usb_device *udev;
67 struct input_dev *input;
68 char name[128];
69 char phys[64];
70};
71
72static struct usb_device_id touchkit_devices[] = {
73 {USB_DEVICE(0x3823, 0x0001)},
74 {USB_DEVICE(0x0123, 0x0001)},
75 {USB_DEVICE(0x0eef, 0x0001)},
76 {USB_DEVICE(0x0eef, 0x0002)},
77 {}
78};
79
80static void touchkit_irq(struct urb *urb, struct pt_regs *regs)
81{
82 struct touchkit_usb *touchkit = urb->context;
83 int retval;
84 int x, y;
85
86 switch (urb->status) {
87 case 0:
88 /* success */
89 break;
90 case -ETIMEDOUT:
91 /* this urb is timing out */
92 dbg("%s - urb timed out - was the device unplugged?",
93 __FUNCTION__);
94 return;
95 case -ECONNRESET:
96 case -ENOENT:
97 case -ESHUTDOWN:
98 /* this urb is terminated, clean up */
99 dbg("%s - urb shutting down with status: %d",
100 __FUNCTION__, urb->status);
101 return;
102 default:
103 dbg("%s - nonzero urb status received: %d",
104 __FUNCTION__, urb->status);
105 goto exit;
106 }
107
108 if (swap_xy) {
109 y = TOUCHKIT_GET_X(touchkit->data);
110 x = TOUCHKIT_GET_Y(touchkit->data);
111 } else {
112 x = TOUCHKIT_GET_X(touchkit->data);
113 y = TOUCHKIT_GET_Y(touchkit->data);
114 }
115
116 input_regs(touchkit->input, regs);
117 input_report_key(touchkit->input, BTN_TOUCH,
118 TOUCHKIT_GET_TOUCHED(touchkit->data));
119 input_report_abs(touchkit->input, ABS_X, x);
120 input_report_abs(touchkit->input, ABS_Y, y);
121 input_sync(touchkit->input);
122
123exit:
124 retval = usb_submit_urb(urb, GFP_ATOMIC);
125 if (retval)
126 err("%s - usb_submit_urb failed with result: %d",
127 __FUNCTION__, retval);
128}
129
130static int touchkit_open(struct input_dev *input)
131{
132 struct touchkit_usb *touchkit = input->private;
133
134 touchkit->irq->dev = touchkit->udev;
135
136 if (usb_submit_urb(touchkit->irq, GFP_ATOMIC))
137 return -EIO;
138
139 return 0;
140}
141
142static void touchkit_close(struct input_dev *input)
143{
144 struct touchkit_usb *touchkit = input->private;
145
146 usb_kill_urb(touchkit->irq);
147}
148
149static int touchkit_alloc_buffers(struct usb_device *udev,
150 struct touchkit_usb *touchkit)
151{
152 touchkit->data = usb_buffer_alloc(udev, TOUCHKIT_REPORT_DATA_SIZE,
153 SLAB_ATOMIC, &touchkit->data_dma);
154
155 if (!touchkit->data)
156 return -1;
157
158 return 0;
159}
160
161static void touchkit_free_buffers(struct usb_device *udev,
162 struct touchkit_usb *touchkit)
163{
164 if (touchkit->data)
165 usb_buffer_free(udev, TOUCHKIT_REPORT_DATA_SIZE,
166 touchkit->data, touchkit->data_dma);
167}
168
169static int touchkit_probe(struct usb_interface *intf,
170 const struct usb_device_id *id)
171{
172 struct touchkit_usb *touchkit;
173 struct input_dev *input_dev;
174 struct usb_host_interface *interface;
175 struct usb_endpoint_descriptor *endpoint;
176 struct usb_device *udev = interface_to_usbdev(intf);
177
178 interface = intf->cur_altsetting;
179 endpoint = &interface->endpoint[0].desc;
180
181 touchkit = kzalloc(sizeof(struct touchkit_usb), GFP_KERNEL);
182 input_dev = input_allocate_device();
183 if (!touchkit || !input_dev)
184 goto out_free;
185
186 if (touchkit_alloc_buffers(udev, touchkit))
187 goto out_free;
188
189 touchkit->irq = usb_alloc_urb(0, GFP_KERNEL);
190 if (!touchkit->irq) {
191 dbg("%s - usb_alloc_urb failed: touchkit->irq", __FUNCTION__);
192 goto out_free_buffers;
193 }
194
195 touchkit->udev = udev;
196 touchkit->input = input_dev;
197
198 if (udev->manufacturer)
199 strlcpy(touchkit->name, udev->manufacturer, sizeof(touchkit->name));
200
201 if (udev->product) {
202 if (udev->manufacturer)
203 strlcat(touchkit->name, " ", sizeof(touchkit->name));
204 strlcat(touchkit->name, udev->product, sizeof(touchkit->name));
205 }
206
207 if (!strlen(touchkit->name))
208 snprintf(touchkit->name, sizeof(touchkit->name),
209 "USB Touchscreen %04x:%04x",
210 le16_to_cpu(udev->descriptor.idVendor),
211 le16_to_cpu(udev->descriptor.idProduct));
212
213 usb_make_path(udev, touchkit->phys, sizeof(touchkit->phys));
214 strlcpy(touchkit->phys, "/input0", sizeof(touchkit->phys));
215
216 input_dev->name = touchkit->name;
217 input_dev->phys = touchkit->phys;
218 usb_to_input_id(udev, &input_dev->id);
219 input_dev->cdev.dev = &intf->dev;
220 input_dev->private = touchkit;
221 input_dev->open = touchkit_open;
222 input_dev->close = touchkit_close;
223
224 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
225 input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
226 input_set_abs_params(input_dev, ABS_X, TOUCHKIT_MIN_XC, TOUCHKIT_MAX_XC,
227 TOUCHKIT_XC_FUZZ, TOUCHKIT_XC_FLAT);
228 input_set_abs_params(input_dev, ABS_Y, TOUCHKIT_MIN_YC, TOUCHKIT_MAX_YC,
229 TOUCHKIT_YC_FUZZ, TOUCHKIT_YC_FLAT);
230
231 usb_fill_int_urb(touchkit->irq, touchkit->udev,
232 usb_rcvintpipe(touchkit->udev, 0x81),
233 touchkit->data, TOUCHKIT_REPORT_DATA_SIZE,
234 touchkit_irq, touchkit, endpoint->bInterval);
235
236 input_register_device(touchkit->input);
237
238 usb_set_intfdata(intf, touchkit);
239 return 0;
240
241out_free_buffers:
242 touchkit_free_buffers(udev, touchkit);
243out_free:
244 input_free_device(input_dev);
245 kfree(touchkit);
246 return -ENOMEM;
247}
248
249static void touchkit_disconnect(struct usb_interface *intf)
250{
251 struct touchkit_usb *touchkit = usb_get_intfdata(intf);
252
253 dbg("%s - called", __FUNCTION__);
254
255 if (!touchkit)
256 return;
257
258 dbg("%s - touchkit is initialized, cleaning up", __FUNCTION__);
259 usb_set_intfdata(intf, NULL);
260 usb_kill_urb(touchkit->irq);
261 input_unregister_device(touchkit->input);
262 usb_free_urb(touchkit->irq);
263 touchkit_free_buffers(interface_to_usbdev(intf), touchkit);
264 kfree(touchkit);
265}
266
267MODULE_DEVICE_TABLE(usb, touchkit_devices);
268
269static struct usb_driver touchkit_driver = {
270 .owner = THIS_MODULE,
271 .name = "touchkitusb",
272 .probe = touchkit_probe,
273 .disconnect = touchkit_disconnect,
274 .id_table = touchkit_devices,
275};
276
277static int __init touchkit_init(void)
278{
279 return usb_register(&touchkit_driver);
280}
281
282static void __exit touchkit_cleanup(void)
283{
284 usb_deregister(&touchkit_driver);
285}
286
287module_init(touchkit_init);
288module_exit(touchkit_cleanup);
289
290MODULE_AUTHOR(DRIVER_AUTHOR);
291MODULE_DESCRIPTION(DRIVER_DESC);
292MODULE_LICENSE("GPL");