tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/******************************************************************************
2 * usbtouchscreen.c
3 * Driver for USB Touchscreens, supporting those devices:
4 * - eGalax Touchkit
5 * includes eTurboTouch CT-410/510/700
6 * - 3M/Microtouch EX II series
7 * - ITM
8 * - PanJit TouchSet
9 * - eTurboTouch
10 * - Gunze AHL61
11 *
12 * Copyright (C) 2004-2006 by Daniel Ritz <daniel.ritz@gmx.ch>
13 * Copyright (C) by Todd E. Johnson (mtouchusb.c)
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License as
17 * published by the Free Software Foundation; either version 2 of the
18 * License, or (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful, but
21 * WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 * General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 *
29 * Driver is based on touchkitusb.c
30 * - ITM parts are from itmtouch.c
31 * - 3M parts are from mtouchusb.c
32 * - PanJit parts are from an unmerged driver by Lanslott Gish
33 *
34 *****************************************************************************/
35
36//#define DEBUG
37
38#include <linux/kernel.h>
39#include <linux/slab.h>
40#include <linux/input.h>
41#include <linux/module.h>
42#include <linux/init.h>
43#include <linux/usb.h>
44#include <linux/usb/input.h>
45
46
47#define DRIVER_VERSION "v0.4"
48#define DRIVER_AUTHOR "Daniel Ritz <daniel.ritz@gmx.ch>"
49#define DRIVER_DESC "USB Touchscreen Driver"
50
51static int swap_xy;
52module_param(swap_xy, bool, 0644);
53MODULE_PARM_DESC(swap_xy, "If set X and Y axes are swapped.");
54
55/* device specifc data/functions */
56struct usbtouch_usb;
57struct usbtouch_device_info {
58 int min_xc, max_xc;
59 int min_yc, max_yc;
60 int min_press, max_press;
61 int rept_size;
62 int flags;
63
64 void (*process_pkt) (struct usbtouch_usb *usbtouch, unsigned char *pkt, int len);
65 int (*get_pkt_len) (unsigned char *pkt, int len);
66 int (*read_data) (unsigned char *pkt, int *x, int *y, int *touch, int *press);
67 int (*init) (struct usbtouch_usb *usbtouch);
68};
69
70#define USBTOUCH_FLG_BUFFER 0x01
71
72
73/* a usbtouch device */
74struct usbtouch_usb {
75 unsigned char *data;
76 dma_addr_t data_dma;
77 unsigned char *buffer;
78 int buf_len;
79 struct urb *irq;
80 struct usb_device *udev;
81 struct input_dev *input;
82 struct usbtouch_device_info *type;
83 char name[128];
84 char phys[64];
85};
86
87
88#if defined(CONFIG_USB_TOUCHSCREEN_EGALAX) || defined(CONFIG_USB_TOUCHSCREEN_ETURBO)
89#define MULTI_PACKET
90#endif
91
92#ifdef MULTI_PACKET
93static void usbtouch_process_multi(struct usbtouch_usb *usbtouch,
94 unsigned char *pkt, int len);
95#endif
96
97/* device types */
98enum {
99 DEVTPYE_DUMMY = -1,
100 DEVTYPE_EGALAX,
101 DEVTYPE_PANJIT,
102 DEVTYPE_3M,
103 DEVTYPE_ITM,
104 DEVTYPE_ETURBO,
105 DEVTYPE_GUNZE,
106};
107
108static struct usb_device_id usbtouch_devices[] = {
109#ifdef CONFIG_USB_TOUCHSCREEN_EGALAX
110 {USB_DEVICE(0x3823, 0x0001), .driver_info = DEVTYPE_EGALAX},
111 {USB_DEVICE(0x3823, 0x0002), .driver_info = DEVTYPE_EGALAX},
112 {USB_DEVICE(0x0123, 0x0001), .driver_info = DEVTYPE_EGALAX},
113 {USB_DEVICE(0x0eef, 0x0001), .driver_info = DEVTYPE_EGALAX},
114 {USB_DEVICE(0x0eef, 0x0002), .driver_info = DEVTYPE_EGALAX},
115 {USB_DEVICE(0x1234, 0x0001), .driver_info = DEVTYPE_EGALAX},
116 {USB_DEVICE(0x1234, 0x0002), .driver_info = DEVTYPE_EGALAX},
117#endif
118
119#ifdef CONFIG_USB_TOUCHSCREEN_PANJIT
120 {USB_DEVICE(0x134c, 0x0001), .driver_info = DEVTYPE_PANJIT},
121 {USB_DEVICE(0x134c, 0x0002), .driver_info = DEVTYPE_PANJIT},
122 {USB_DEVICE(0x134c, 0x0003), .driver_info = DEVTYPE_PANJIT},
123 {USB_DEVICE(0x134c, 0x0004), .driver_info = DEVTYPE_PANJIT},
124#endif
125
126#ifdef CONFIG_USB_TOUCHSCREEN_3M
127 {USB_DEVICE(0x0596, 0x0001), .driver_info = DEVTYPE_3M},
128#endif
129
130#ifdef CONFIG_USB_TOUCHSCREEN_ITM
131 {USB_DEVICE(0x0403, 0xf9e9), .driver_info = DEVTYPE_ITM},
132#endif
133
134#ifdef CONFIG_USB_TOUCHSCREEN_ETURBO
135 {USB_DEVICE(0x1234, 0x5678), .driver_info = DEVTYPE_ETURBO},
136#endif
137
138#ifdef CONFIG_USB_TOUCHSCREEN_GUNZE
139 {USB_DEVICE(0x0637, 0x0001), .driver_info = DEVTYPE_GUNZE},
140#endif
141
142 {}
143};
144
145
146/*****************************************************************************
147 * eGalax part
148 */
149
150#ifdef CONFIG_USB_TOUCHSCREEN_EGALAX
151
152#define EGALAX_PKT_TYPE_MASK 0xFE
153#define EGALAX_PKT_TYPE_REPT 0x80
154#define EGALAX_PKT_TYPE_DIAG 0x0A
155
156static int egalax_read_data(unsigned char *pkt, int *x, int *y, int *touch, int *press)
157{
158 if ((pkt[0] & EGALAX_PKT_TYPE_MASK) != EGALAX_PKT_TYPE_REPT)
159 return 0;
160
161 *x = ((pkt[3] & 0x0F) << 7) | (pkt[4] & 0x7F);
162 *y = ((pkt[1] & 0x0F) << 7) | (pkt[2] & 0x7F);
163 *touch = pkt[0] & 0x01;
164
165 return 1;
166}
167
168static int egalax_get_pkt_len(unsigned char *buf, int len)
169{
170 switch (buf[0] & EGALAX_PKT_TYPE_MASK) {
171 case EGALAX_PKT_TYPE_REPT:
172 return 5;
173
174 case EGALAX_PKT_TYPE_DIAG:
175 if (len < 2)
176 return -1;
177
178 return buf[1] + 2;
179 }
180
181 return 0;
182}
183#endif
184
185
186/*****************************************************************************
187 * PanJit Part
188 */
189#ifdef CONFIG_USB_TOUCHSCREEN_PANJIT
190static int panjit_read_data(unsigned char *pkt, int *x, int *y, int *touch, int *press)
191{
192 *x = ((pkt[2] & 0x0F) << 8) | pkt[1];
193 *y = ((pkt[4] & 0x0F) << 8) | pkt[3];
194 *touch = pkt[0] & 0x01;
195
196 return 1;
197}
198#endif
199
200
201/*****************************************************************************
202 * 3M/Microtouch Part
203 */
204#ifdef CONFIG_USB_TOUCHSCREEN_3M
205
206#define MTOUCHUSB_ASYNC_REPORT 1
207#define MTOUCHUSB_RESET 7
208#define MTOUCHUSB_REQ_CTRLLR_ID 10
209
210static int mtouch_read_data(unsigned char *pkt, int *x, int *y, int *touch, int *press)
211{
212 *x = (pkt[8] << 8) | pkt[7];
213 *y = (pkt[10] << 8) | pkt[9];
214 *touch = (pkt[2] & 0x40) ? 1 : 0;
215
216 return 1;
217}
218
219static int mtouch_init(struct usbtouch_usb *usbtouch)
220{
221 int ret, i;
222
223 ret = usb_control_msg(usbtouch->udev, usb_rcvctrlpipe(usbtouch->udev, 0),
224 MTOUCHUSB_RESET,
225 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
226 1, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
227 dbg("%s - usb_control_msg - MTOUCHUSB_RESET - bytes|err: %d",
228 __FUNCTION__, ret);
229 if (ret < 0)
230 return ret;
231 msleep(150);
232
233 for (i = 0; i < 3; i++) {
234 ret = usb_control_msg(usbtouch->udev, usb_rcvctrlpipe(usbtouch->udev, 0),
235 MTOUCHUSB_ASYNC_REPORT,
236 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
237 1, 1, NULL, 0, USB_CTRL_SET_TIMEOUT);
238 dbg("%s - usb_control_msg - MTOUCHUSB_ASYNC_REPORT - bytes|err: %d",
239 __FUNCTION__, ret);
240 if (ret >= 0)
241 break;
242 if (ret != -EPIPE)
243 return ret;
244 }
245
246 return 0;
247}
248#endif
249
250
251/*****************************************************************************
252 * ITM Part
253 */
254#ifdef CONFIG_USB_TOUCHSCREEN_ITM
255static int itm_read_data(unsigned char *pkt, int *x, int *y, int *touch, int *press)
256{
257 *x = ((pkt[0] & 0x1F) << 7) | (pkt[3] & 0x7F);
258 *y = ((pkt[1] & 0x1F) << 7) | (pkt[4] & 0x7F);
259 *press = ((pkt[2] & 0x01) << 7) | (pkt[5] & 0x7F);
260 *touch = ~pkt[7] & 0x20;
261
262 return *touch;
263}
264#endif
265
266
267/*****************************************************************************
268 * eTurboTouch part
269 */
270#ifdef CONFIG_USB_TOUCHSCREEN_ETURBO
271static int eturbo_read_data(unsigned char *pkt, int *x, int *y, int *touch, int *press)
272{
273 unsigned int shift;
274
275 /* packets should start with sync */
276 if (!(pkt[0] & 0x80))
277 return 0;
278
279 shift = (6 - (pkt[0] & 0x03));
280 *x = ((pkt[3] << 7) | pkt[4]) >> shift;
281 *y = ((pkt[1] << 7) | pkt[2]) >> shift;
282 *touch = (pkt[0] & 0x10) ? 1 : 0;
283
284 return 1;
285}
286
287static int eturbo_get_pkt_len(unsigned char *buf, int len)
288{
289 if (buf[0] & 0x80)
290 return 5;
291 if (buf[0] == 0x01)
292 return 3;
293 return 0;
294}
295#endif
296
297
298/*****************************************************************************
299 * Gunze part
300 */
301#ifdef CONFIG_USB_TOUCHSCREEN_GUNZE
302static int gunze_read_data(unsigned char *pkt, int *x, int *y, int *touch, int *press)
303{
304 if (!(pkt[0] & 0x80) || ((pkt[1] | pkt[2] | pkt[3]) & 0x80))
305 return 0;
306
307 *x = ((pkt[0] & 0x1F) << 7) | (pkt[2] & 0x7F);
308 *y = ((pkt[1] & 0x1F) << 7) | (pkt[3] & 0x7F);
309 *touch = pkt[0] & 0x20;
310
311 return 1;
312}
313#endif
314
315/*****************************************************************************
316 * the different device descriptors
317 */
318static struct usbtouch_device_info usbtouch_dev_info[] = {
319#ifdef CONFIG_USB_TOUCHSCREEN_EGALAX
320 [DEVTYPE_EGALAX] = {
321 .min_xc = 0x0,
322 .max_xc = 0x07ff,
323 .min_yc = 0x0,
324 .max_yc = 0x07ff,
325 .rept_size = 16,
326 .flags = USBTOUCH_FLG_BUFFER,
327 .process_pkt = usbtouch_process_multi,
328 .get_pkt_len = egalax_get_pkt_len,
329 .read_data = egalax_read_data,
330 },
331#endif
332
333#ifdef CONFIG_USB_TOUCHSCREEN_PANJIT
334 [DEVTYPE_PANJIT] = {
335 .min_xc = 0x0,
336 .max_xc = 0x0fff,
337 .min_yc = 0x0,
338 .max_yc = 0x0fff,
339 .rept_size = 8,
340 .read_data = panjit_read_data,
341 },
342#endif
343
344#ifdef CONFIG_USB_TOUCHSCREEN_3M
345 [DEVTYPE_3M] = {
346 .min_xc = 0x0,
347 .max_xc = 0x4000,
348 .min_yc = 0x0,
349 .max_yc = 0x4000,
350 .rept_size = 11,
351 .read_data = mtouch_read_data,
352 .init = mtouch_init,
353 },
354#endif
355
356#ifdef CONFIG_USB_TOUCHSCREEN_ITM
357 [DEVTYPE_ITM] = {
358 .min_xc = 0x0,
359 .max_xc = 0x0fff,
360 .min_yc = 0x0,
361 .max_yc = 0x0fff,
362 .max_press = 0xff,
363 .rept_size = 8,
364 .read_data = itm_read_data,
365 },
366#endif
367
368#ifdef CONFIG_USB_TOUCHSCREEN_ETURBO
369 [DEVTYPE_ETURBO] = {
370 .min_xc = 0x0,
371 .max_xc = 0x07ff,
372 .min_yc = 0x0,
373 .max_yc = 0x07ff,
374 .rept_size = 8,
375 .flags = USBTOUCH_FLG_BUFFER,
376 .process_pkt = usbtouch_process_multi,
377 .get_pkt_len = eturbo_get_pkt_len,
378 .read_data = eturbo_read_data,
379 },
380#endif
381
382#ifdef CONFIG_USB_TOUCHSCREEN_GUNZE
383 [DEVTYPE_GUNZE] = {
384 .min_xc = 0x0,
385 .max_xc = 0x0fff,
386 .min_yc = 0x0,
387 .max_yc = 0x0fff,
388 .rept_size = 4,
389 .read_data = gunze_read_data,
390 },
391#endif
392};
393
394
395/*****************************************************************************
396 * Generic Part
397 */
398static void usbtouch_process_pkt(struct usbtouch_usb *usbtouch,
399 unsigned char *pkt, int len)
400{
401 int x, y, touch, press;
402 struct usbtouch_device_info *type = usbtouch->type;
403
404 if (!type->read_data(pkt, &x, &y, &touch, &press))
405 return;
406
407 input_report_key(usbtouch->input, BTN_TOUCH, touch);
408
409 if (swap_xy) {
410 input_report_abs(usbtouch->input, ABS_X, y);
411 input_report_abs(usbtouch->input, ABS_Y, x);
412 } else {
413 input_report_abs(usbtouch->input, ABS_X, x);
414 input_report_abs(usbtouch->input, ABS_Y, y);
415 }
416 if (type->max_press)
417 input_report_abs(usbtouch->input, ABS_PRESSURE, press);
418 input_sync(usbtouch->input);
419}
420
421
422#ifdef MULTI_PACKET
423static void usbtouch_process_multi(struct usbtouch_usb *usbtouch,
424 unsigned char *pkt, int len)
425{
426 unsigned char *buffer;
427 int pkt_len, pos, buf_len, tmp;
428
429 /* process buffer */
430 if (unlikely(usbtouch->buf_len)) {
431 /* try to get size */
432 pkt_len = usbtouch->type->get_pkt_len(
433 usbtouch->buffer, usbtouch->buf_len);
434
435 /* drop? */
436 if (unlikely(!pkt_len))
437 goto out_flush_buf;
438
439 /* need to append -pkt_len bytes before able to get size */
440 if (unlikely(pkt_len < 0)) {
441 int append = -pkt_len;
442 if (unlikely(append > len))
443 append = len;
444 if (usbtouch->buf_len + append >= usbtouch->type->rept_size)
445 goto out_flush_buf;
446 memcpy(usbtouch->buffer + usbtouch->buf_len, pkt, append);
447 usbtouch->buf_len += append;
448
449 pkt_len = usbtouch->type->get_pkt_len(
450 usbtouch->buffer, usbtouch->buf_len);
451 if (pkt_len < 0)
452 return;
453 }
454
455 /* append */
456 tmp = pkt_len - usbtouch->buf_len;
457 if (usbtouch->buf_len + tmp >= usbtouch->type->rept_size)
458 goto out_flush_buf;
459 memcpy(usbtouch->buffer + usbtouch->buf_len, pkt, tmp);
460 usbtouch_process_pkt(usbtouch, usbtouch->buffer, pkt_len);
461
462 buffer = pkt + tmp;
463 buf_len = len - tmp;
464 } else {
465 buffer = pkt;
466 buf_len = len;
467 }
468
469 /* loop over the received packet, process */
470 pos = 0;
471 while (pos < buf_len) {
472 /* get packet len */
473 pkt_len = usbtouch->type->get_pkt_len(buffer + pos, len);
474
475 /* unknown packet: drop everything */
476 if (unlikely(!pkt_len))
477 goto out_flush_buf;
478
479 /* full packet: process */
480 if (likely((pkt_len > 0) && (pkt_len <= buf_len - pos))) {
481 usbtouch_process_pkt(usbtouch, buffer + pos, pkt_len);
482 } else {
483 /* incomplete packet: save in buffer */
484 memcpy(usbtouch->buffer, buffer + pos, buf_len - pos);
485 usbtouch->buf_len = buf_len - pos;
486 return;
487 }
488 pos += pkt_len;
489 }
490
491out_flush_buf:
492 usbtouch->buf_len = 0;
493 return;
494}
495#endif
496
497
498static void usbtouch_irq(struct urb *urb)
499{
500 struct usbtouch_usb *usbtouch = urb->context;
501 int retval;
502
503 switch (urb->status) {
504 case 0:
505 /* success */
506 break;
507 case -ETIME:
508 /* this urb is timing out */
509 dbg("%s - urb timed out - was the device unplugged?",
510 __FUNCTION__);
511 return;
512 case -ECONNRESET:
513 case -ENOENT:
514 case -ESHUTDOWN:
515 /* this urb is terminated, clean up */
516 dbg("%s - urb shutting down with status: %d",
517 __FUNCTION__, urb->status);
518 return;
519 default:
520 dbg("%s - nonzero urb status received: %d",
521 __FUNCTION__, urb->status);
522 goto exit;
523 }
524
525 usbtouch->type->process_pkt(usbtouch, usbtouch->data, urb->actual_length);
526
527exit:
528 retval = usb_submit_urb(urb, GFP_ATOMIC);
529 if (retval)
530 err("%s - usb_submit_urb failed with result: %d",
531 __FUNCTION__, retval);
532}
533
534static int usbtouch_open(struct input_dev *input)
535{
536 struct usbtouch_usb *usbtouch = input->private;
537
538 usbtouch->irq->dev = usbtouch->udev;
539
540 if (usb_submit_urb(usbtouch->irq, GFP_KERNEL))
541 return -EIO;
542
543 return 0;
544}
545
546static void usbtouch_close(struct input_dev *input)
547{
548 struct usbtouch_usb *usbtouch = input->private;
549
550 usb_kill_urb(usbtouch->irq);
551}
552
553
554static void usbtouch_free_buffers(struct usb_device *udev,
555 struct usbtouch_usb *usbtouch)
556{
557 if (usbtouch->data)
558 usb_buffer_free(udev, usbtouch->type->rept_size,
559 usbtouch->data, usbtouch->data_dma);
560 kfree(usbtouch->buffer);
561}
562
563
564static int usbtouch_probe(struct usb_interface *intf,
565 const struct usb_device_id *id)
566{
567 struct usbtouch_usb *usbtouch;
568 struct input_dev *input_dev;
569 struct usb_host_interface *interface;
570 struct usb_endpoint_descriptor *endpoint;
571 struct usb_device *udev = interface_to_usbdev(intf);
572 struct usbtouch_device_info *type;
573 int err = -ENOMEM;
574
575 interface = intf->cur_altsetting;
576 endpoint = &interface->endpoint[0].desc;
577
578 usbtouch = kzalloc(sizeof(struct usbtouch_usb), GFP_KERNEL);
579 input_dev = input_allocate_device();
580 if (!usbtouch || !input_dev)
581 goto out_free;
582
583 type = &usbtouch_dev_info[id->driver_info];
584 usbtouch->type = type;
585 if (!type->process_pkt)
586 type->process_pkt = usbtouch_process_pkt;
587
588 usbtouch->data = usb_buffer_alloc(udev, type->rept_size,
589 SLAB_KERNEL, &usbtouch->data_dma);
590 if (!usbtouch->data)
591 goto out_free;
592
593 if (type->flags & USBTOUCH_FLG_BUFFER) {
594 usbtouch->buffer = kmalloc(type->rept_size, GFP_KERNEL);
595 if (!usbtouch->buffer)
596 goto out_free_buffers;
597 }
598
599 usbtouch->irq = usb_alloc_urb(0, GFP_KERNEL);
600 if (!usbtouch->irq) {
601 dbg("%s - usb_alloc_urb failed: usbtouch->irq", __FUNCTION__);
602 goto out_free_buffers;
603 }
604
605 usbtouch->udev = udev;
606 usbtouch->input = input_dev;
607
608 if (udev->manufacturer)
609 strlcpy(usbtouch->name, udev->manufacturer, sizeof(usbtouch->name));
610
611 if (udev->product) {
612 if (udev->manufacturer)
613 strlcat(usbtouch->name, " ", sizeof(usbtouch->name));
614 strlcat(usbtouch->name, udev->product, sizeof(usbtouch->name));
615 }
616
617 if (!strlen(usbtouch->name))
618 snprintf(usbtouch->name, sizeof(usbtouch->name),
619 "USB Touchscreen %04x:%04x",
620 le16_to_cpu(udev->descriptor.idVendor),
621 le16_to_cpu(udev->descriptor.idProduct));
622
623 usb_make_path(udev, usbtouch->phys, sizeof(usbtouch->phys));
624 strlcpy(usbtouch->phys, "/input0", sizeof(usbtouch->phys));
625
626 input_dev->name = usbtouch->name;
627 input_dev->phys = usbtouch->phys;
628 usb_to_input_id(udev, &input_dev->id);
629 input_dev->cdev.dev = &intf->dev;
630 input_dev->private = usbtouch;
631 input_dev->open = usbtouch_open;
632 input_dev->close = usbtouch_close;
633
634 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
635 input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
636 input_set_abs_params(input_dev, ABS_X, type->min_xc, type->max_xc, 0, 0);
637 input_set_abs_params(input_dev, ABS_Y, type->min_yc, type->max_yc, 0, 0);
638 if (type->max_press)
639 input_set_abs_params(input_dev, ABS_PRESSURE, type->min_press,
640 type->max_press, 0, 0);
641
642 usb_fill_int_urb(usbtouch->irq, usbtouch->udev,
643 usb_rcvintpipe(usbtouch->udev, endpoint->bEndpointAddress),
644 usbtouch->data, type->rept_size,
645 usbtouch_irq, usbtouch, endpoint->bInterval);
646
647 usbtouch->irq->dev = usbtouch->udev;
648 usbtouch->irq->transfer_dma = usbtouch->data_dma;
649 usbtouch->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
650
651 /* device specific init */
652 if (type->init) {
653 err = type->init(usbtouch);
654 if (err) {
655 dbg("%s - type->init() failed, err: %d", __FUNCTION__, err);
656 goto out_free_buffers;
657 }
658 }
659
660 err = input_register_device(usbtouch->input);
661 if (err) {
662 dbg("%s - input_register_device failed, err: %d", __FUNCTION__, err);
663 goto out_free_buffers;
664 }
665
666 usb_set_intfdata(intf, usbtouch);
667
668 return 0;
669
670out_free_buffers:
671 usbtouch_free_buffers(udev, usbtouch);
672out_free:
673 input_free_device(input_dev);
674 kfree(usbtouch);
675 return err;
676}
677
678static void usbtouch_disconnect(struct usb_interface *intf)
679{
680 struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);
681
682 dbg("%s - called", __FUNCTION__);
683
684 if (!usbtouch)
685 return;
686
687 dbg("%s - usbtouch is initialized, cleaning up", __FUNCTION__);
688 usb_set_intfdata(intf, NULL);
689 usb_kill_urb(usbtouch->irq);
690 input_unregister_device(usbtouch->input);
691 usb_free_urb(usbtouch->irq);
692 usbtouch_free_buffers(interface_to_usbdev(intf), usbtouch);
693 kfree(usbtouch);
694}
695
696MODULE_DEVICE_TABLE(usb, usbtouch_devices);
697
698static struct usb_driver usbtouch_driver = {
699 .name = "usbtouchscreen",
700 .probe = usbtouch_probe,
701 .disconnect = usbtouch_disconnect,
702 .id_table = usbtouch_devices,
703};
704
705static int __init usbtouch_init(void)
706{
707 return usb_register(&usbtouch_driver);
708}
709
710static void __exit usbtouch_cleanup(void)
711{
712 usb_deregister(&usbtouch_driver);
713}
714
715module_init(usbtouch_init);
716module_exit(usbtouch_cleanup);
717
718MODULE_AUTHOR(DRIVER_AUTHOR);
719MODULE_DESCRIPTION(DRIVER_DESC);
720MODULE_LICENSE("GPL");
721
722MODULE_ALIAS("touchkitusb");
723MODULE_ALIAS("itmtouch");
724MODULE_ALIAS("mtouchusb");