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  *  - DMC TSC-10/25
12  *  - IRTOUCHSYSTEMS/UNITOP
13  *  - IdealTEK URTC1000
14  *  - General Touch
15  *  - GoTop Super_Q2/GogoPen/PenPower tablets
16  *  - JASTEC USB touch controller/DigiTech DTR-02U
17  *  - Zytronic capacitive touchscreen
18  *  - NEXIO/iNexio
19  *  - Elo TouchSystems 2700 IntelliTouch
20  *  - EasyTouch USB Dual/Multi touch controller from Data Modul
21  *
22  * Copyright (C) 2004-2007 by Daniel Ritz <daniel.ritz@gmx.ch>
23  * Copyright (C) by Todd E. Johnson (mtouchusb.c)
24  *
25  * This program is free software; you can redistribute it and/or
26  * modify it under the terms of the GNU General Public License as
27  * published by the Free Software Foundation; either version 2 of the
28  * License, or (at your option) any later version.
29  *
30  * This program is distributed in the hope that it will be useful, but
31  * WITHOUT ANY WARRANTY; without even the implied warranty of
32  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
33  * General Public License for more details.
34  *
35  * You should have received a copy of the GNU General Public License
36  * along with this program; if not, write to the Free Software
37  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
38  *
39  * Driver is based on touchkitusb.c
40  * - ITM parts are from itmtouch.c
41  * - 3M parts are from mtouchusb.c
42  * - PanJit parts are from an unmerged driver by Lanslott Gish
43  * - DMC TSC 10/25 are from Holger Schurig, with ideas from an unmerged
44  *   driver from Marius Vollmer
45  *
46  *****************************************************************************/
47 
48 //#define DEBUG
49 
50 #include <linux/kernel.h>
51 #include <linux/slab.h>
52 #include <linux/input.h>
53 #include <linux/module.h>
54 #include <linux/usb.h>
55 #include <linux/usb/input.h>
56 #include <linux/hid.h>
57 #include <linux/mutex.h>
58 
59 static bool swap_xy;
60 module_param(swap_xy, bool, 0644);
61 MODULE_PARM_DESC(swap_xy, "If set X and Y axes are swapped.");
62 
63 static bool hwcalib_xy;
64 module_param(hwcalib_xy, bool, 0644);
65 MODULE_PARM_DESC(hwcalib_xy, "If set hw-calibrated X/Y are used if available");
66 
67 /* device specifc data/functions */
68 struct usbtouch_usb;
69 struct usbtouch_device_info {
70 	int min_xc, max_xc;
71 	int min_yc, max_yc;
72 	int min_press, max_press;
73 	int rept_size;
74 
75 	/*
76 	 * Always service the USB devices irq not just when the input device is
77 	 * open. This is useful when devices have a watchdog which prevents us
78 	 * from periodically polling the device. Leave this unset unless your
79 	 * touchscreen device requires it, as it does consume more of the USB
80 	 * bandwidth.
81 	 */
82 	bool irq_always;
83 
84 	void (*process_pkt) (struct usbtouch_usb *usbtouch, unsigned char *pkt, int len);
85 
86 	/*
87 	 * used to get the packet len. possible return values:
88 	 * > 0: packet len
89 	 * = 0: skip one byte
90 	 * < 0: -return value more bytes needed
91 	 */
92 	int  (*get_pkt_len) (unsigned char *pkt, int len);
93 
94 	int  (*read_data)   (struct usbtouch_usb *usbtouch, unsigned char *pkt);
95 	int  (*alloc)       (struct usbtouch_usb *usbtouch);
96 	int  (*init)        (struct usbtouch_usb *usbtouch);
97 	void (*exit)	    (struct usbtouch_usb *usbtouch);
98 };
99 
100 /* a usbtouch device */
101 struct usbtouch_usb {
102 	unsigned char *data;
103 	dma_addr_t data_dma;
104 	int data_size;
105 	unsigned char *buffer;
106 	int buf_len;
107 	struct urb *irq;
108 	struct usb_interface *interface;
109 	struct input_dev *input;
110 	struct usbtouch_device_info *type;
111 	struct mutex pm_mutex;  /* serialize access to open/suspend */
112 	bool is_open;
113 	char name[128];
114 	char phys[64];
115 	void *priv;
116 
117 	int x, y;
118 	int touch, press;
119 };
120 
121 
122 /* device types */
123 enum {
124 	DEVTYPE_IGNORE = -1,
125 	DEVTYPE_EGALAX,
126 	DEVTYPE_PANJIT,
127 	DEVTYPE_3M,
128 	DEVTYPE_ITM,
129 	DEVTYPE_ETURBO,
130 	DEVTYPE_GUNZE,
131 	DEVTYPE_DMC_TSC10,
132 	DEVTYPE_IRTOUCH,
133 	DEVTYPE_IRTOUCH_HIRES,
134 	DEVTYPE_IDEALTEK,
135 	DEVTYPE_GENERAL_TOUCH,
136 	DEVTYPE_GOTOP,
137 	DEVTYPE_JASTEC,
138 	DEVTYPE_E2I,
139 	DEVTYPE_ZYTRONIC,
140 	DEVTYPE_TC45USB,
141 	DEVTYPE_NEXIO,
142 	DEVTYPE_ELO,
143 	DEVTYPE_ETOUCH,
144 };
145 
146 #define USB_DEVICE_HID_CLASS(vend, prod) \
147 	.match_flags = USB_DEVICE_ID_MATCH_INT_CLASS \
148 		| USB_DEVICE_ID_MATCH_DEVICE, \
149 	.idVendor = (vend), \
150 	.idProduct = (prod), \
151 	.bInterfaceClass = USB_INTERFACE_CLASS_HID
152 
153 static const struct usb_device_id usbtouch_devices[] = {
154 #ifdef CONFIG_TOUCHSCREEN_USB_EGALAX
155 	/* ignore the HID capable devices, handled by usbhid */
156 	{USB_DEVICE_HID_CLASS(0x0eef, 0x0001), .driver_info = DEVTYPE_IGNORE},
157 	{USB_DEVICE_HID_CLASS(0x0eef, 0x0002), .driver_info = DEVTYPE_IGNORE},
158 
159 	/* normal device IDs */
160 	{USB_DEVICE(0x3823, 0x0001), .driver_info = DEVTYPE_EGALAX},
161 	{USB_DEVICE(0x3823, 0x0002), .driver_info = DEVTYPE_EGALAX},
162 	{USB_DEVICE(0x0123, 0x0001), .driver_info = DEVTYPE_EGALAX},
163 	{USB_DEVICE(0x0eef, 0x0001), .driver_info = DEVTYPE_EGALAX},
164 	{USB_DEVICE(0x0eef, 0x0002), .driver_info = DEVTYPE_EGALAX},
165 	{USB_DEVICE(0x1234, 0x0001), .driver_info = DEVTYPE_EGALAX},
166 	{USB_DEVICE(0x1234, 0x0002), .driver_info = DEVTYPE_EGALAX},
167 #endif
168 
169 #ifdef CONFIG_TOUCHSCREEN_USB_PANJIT
170 	{USB_DEVICE(0x134c, 0x0001), .driver_info = DEVTYPE_PANJIT},
171 	{USB_DEVICE(0x134c, 0x0002), .driver_info = DEVTYPE_PANJIT},
172 	{USB_DEVICE(0x134c, 0x0003), .driver_info = DEVTYPE_PANJIT},
173 	{USB_DEVICE(0x134c, 0x0004), .driver_info = DEVTYPE_PANJIT},
174 #endif
175 
176 #ifdef CONFIG_TOUCHSCREEN_USB_3M
177 	{USB_DEVICE(0x0596, 0x0001), .driver_info = DEVTYPE_3M},
178 #endif
179 
180 #ifdef CONFIG_TOUCHSCREEN_USB_ITM
181 	{USB_DEVICE(0x0403, 0xf9e9), .driver_info = DEVTYPE_ITM},
182 	{USB_DEVICE(0x16e3, 0xf9e9), .driver_info = DEVTYPE_ITM},
183 #endif
184 
185 #ifdef CONFIG_TOUCHSCREEN_USB_ETURBO
186 	{USB_DEVICE(0x1234, 0x5678), .driver_info = DEVTYPE_ETURBO},
187 #endif
188 
189 #ifdef CONFIG_TOUCHSCREEN_USB_GUNZE
190 	{USB_DEVICE(0x0637, 0x0001), .driver_info = DEVTYPE_GUNZE},
191 #endif
192 
193 #ifdef CONFIG_TOUCHSCREEN_USB_DMC_TSC10
194 	{USB_DEVICE(0x0afa, 0x03e8), .driver_info = DEVTYPE_DMC_TSC10},
195 #endif
196 
197 #ifdef CONFIG_TOUCHSCREEN_USB_IRTOUCH
198 	{USB_DEVICE(0x595a, 0x0001), .driver_info = DEVTYPE_IRTOUCH},
199 	{USB_DEVICE(0x6615, 0x0001), .driver_info = DEVTYPE_IRTOUCH},
200 	{USB_DEVICE(0x6615, 0x0012), .driver_info = DEVTYPE_IRTOUCH_HIRES},
201 #endif
202 
203 #ifdef CONFIG_TOUCHSCREEN_USB_IDEALTEK
204 	{USB_DEVICE(0x1391, 0x1000), .driver_info = DEVTYPE_IDEALTEK},
205 #endif
206 
207 #ifdef CONFIG_TOUCHSCREEN_USB_GENERAL_TOUCH
208 	{USB_DEVICE(0x0dfc, 0x0001), .driver_info = DEVTYPE_GENERAL_TOUCH},
209 #endif
210 
211 #ifdef CONFIG_TOUCHSCREEN_USB_GOTOP
212 	{USB_DEVICE(0x08f2, 0x007f), .driver_info = DEVTYPE_GOTOP},
213 	{USB_DEVICE(0x08f2, 0x00ce), .driver_info = DEVTYPE_GOTOP},
214 	{USB_DEVICE(0x08f2, 0x00f4), .driver_info = DEVTYPE_GOTOP},
215 #endif
216 
217 #ifdef CONFIG_TOUCHSCREEN_USB_JASTEC
218 	{USB_DEVICE(0x0f92, 0x0001), .driver_info = DEVTYPE_JASTEC},
219 #endif
220 
221 #ifdef CONFIG_TOUCHSCREEN_USB_E2I
222 	{USB_DEVICE(0x1ac7, 0x0001), .driver_info = DEVTYPE_E2I},
223 #endif
224 
225 #ifdef CONFIG_TOUCHSCREEN_USB_ZYTRONIC
226 	{USB_DEVICE(0x14c8, 0x0003), .driver_info = DEVTYPE_ZYTRONIC},
227 #endif
228 
229 #ifdef CONFIG_TOUCHSCREEN_USB_ETT_TC45USB
230 	/* TC5UH */
231 	{USB_DEVICE(0x0664, 0x0309), .driver_info = DEVTYPE_TC45USB},
232 	/* TC4UM */
233 	{USB_DEVICE(0x0664, 0x0306), .driver_info = DEVTYPE_TC45USB},
234 #endif
235 
236 #ifdef CONFIG_TOUCHSCREEN_USB_NEXIO
237 	/* data interface only */
238 	{USB_DEVICE_AND_INTERFACE_INFO(0x10f0, 0x2002, 0x0a, 0x00, 0x00),
239 		.driver_info = DEVTYPE_NEXIO},
240 	{USB_DEVICE_AND_INTERFACE_INFO(0x1870, 0x0001, 0x0a, 0x00, 0x00),
241 		.driver_info = DEVTYPE_NEXIO},
242 #endif
243 
244 #ifdef CONFIG_TOUCHSCREEN_USB_ELO
245 	{USB_DEVICE(0x04e7, 0x0020), .driver_info = DEVTYPE_ELO},
246 #endif
247 
248 #ifdef CONFIG_TOUCHSCREEN_USB_EASYTOUCH
249 	{USB_DEVICE(0x7374, 0x0001), .driver_info = DEVTYPE_ETOUCH},
250 #endif
251 
252 	{}
253 };
254 
255 
256 /*****************************************************************************
257  * e2i Part
258  */
259 
260 #ifdef CONFIG_TOUCHSCREEN_USB_E2I
261 static int e2i_init(struct usbtouch_usb *usbtouch)
262 {
263 	int ret;
264 	struct usb_device *udev = interface_to_usbdev(usbtouch->interface);
265 
266 	ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
267 	                      0x01, 0x02, 0x0000, 0x0081,
268 	                      NULL, 0, USB_CTRL_SET_TIMEOUT);
269 
270 	dev_dbg(&usbtouch->interface->dev,
271 		"%s - usb_control_msg - E2I_RESET - bytes|err: %d\n",
272 		__func__, ret);
273 	return ret;
274 }
275 
276 static int e2i_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
277 {
278 	int tmp = (pkt[0] << 8) | pkt[1];
279 	dev->x  = (pkt[2] << 8) | pkt[3];
280 	dev->y  = (pkt[4] << 8) | pkt[5];
281 
282 	tmp = tmp - 0xA000;
283 	dev->touch = (tmp > 0);
284 	dev->press = (tmp > 0 ? tmp : 0);
285 
286 	return 1;
287 }
288 #endif
289 
290 
291 /*****************************************************************************
292  * eGalax part
293  */
294 
295 #ifdef CONFIG_TOUCHSCREEN_USB_EGALAX
296 
297 #ifndef MULTI_PACKET
298 #define MULTI_PACKET
299 #endif
300 
301 #define EGALAX_PKT_TYPE_MASK		0xFE
302 #define EGALAX_PKT_TYPE_REPT		0x80
303 #define EGALAX_PKT_TYPE_DIAG		0x0A
304 
305 static int egalax_init(struct usbtouch_usb *usbtouch)
306 {
307 	int ret, i;
308 	unsigned char *buf;
309 	struct usb_device *udev = interface_to_usbdev(usbtouch->interface);
310 
311 	/*
312 	 * An eGalax diagnostic packet kicks the device into using the right
313 	 * protocol.  We send a "check active" packet.  The response will be
314 	 * read later and ignored.
315 	 */
316 
317 	buf = kmalloc(3, GFP_KERNEL);
318 	if (!buf)
319 		return -ENOMEM;
320 
321 	buf[0] = EGALAX_PKT_TYPE_DIAG;
322 	buf[1] = 1;	/* length */
323 	buf[2] = 'A';	/* command - check active */
324 
325 	for (i = 0; i < 3; i++) {
326 		ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
327 				      0,
328 				      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
329 				      0, 0, buf, 3,
330 				      USB_CTRL_SET_TIMEOUT);
331 		if (ret >= 0) {
332 			ret = 0;
333 			break;
334 		}
335 		if (ret != -EPIPE)
336 			break;
337 	}
338 
339 	kfree(buf);
340 
341 	return ret;
342 }
343 
344 static int egalax_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
345 {
346 	if ((pkt[0] & EGALAX_PKT_TYPE_MASK) != EGALAX_PKT_TYPE_REPT)
347 		return 0;
348 
349 	dev->x = ((pkt[3] & 0x0F) << 7) | (pkt[4] & 0x7F);
350 	dev->y = ((pkt[1] & 0x0F) << 7) | (pkt[2] & 0x7F);
351 	dev->touch = pkt[0] & 0x01;
352 
353 	return 1;
354 }
355 
356 static int egalax_get_pkt_len(unsigned char *buf, int len)
357 {
358 	switch (buf[0] & EGALAX_PKT_TYPE_MASK) {
359 	case EGALAX_PKT_TYPE_REPT:
360 		return 5;
361 
362 	case EGALAX_PKT_TYPE_DIAG:
363 		if (len < 2)
364 			return -1;
365 
366 		return buf[1] + 2;
367 	}
368 
369 	return 0;
370 }
371 #endif
372 
373 /*****************************************************************************
374  * EasyTouch part
375  */
376 
377 #ifdef CONFIG_TOUCHSCREEN_USB_EASYTOUCH
378 
379 #ifndef MULTI_PACKET
380 #define MULTI_PACKET
381 #endif
382 
383 #define ETOUCH_PKT_TYPE_MASK		0xFE
384 #define ETOUCH_PKT_TYPE_REPT		0x80
385 #define ETOUCH_PKT_TYPE_REPT2		0xB0
386 #define ETOUCH_PKT_TYPE_DIAG		0x0A
387 
388 static int etouch_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
389 {
390 	if ((pkt[0] & ETOUCH_PKT_TYPE_MASK) != ETOUCH_PKT_TYPE_REPT &&
391 		(pkt[0] & ETOUCH_PKT_TYPE_MASK) != ETOUCH_PKT_TYPE_REPT2)
392 		return 0;
393 
394 	dev->x = ((pkt[1] & 0x1F) << 7) | (pkt[2] & 0x7F);
395 	dev->y = ((pkt[3] & 0x1F) << 7) | (pkt[4] & 0x7F);
396 	dev->touch = pkt[0] & 0x01;
397 
398 	return 1;
399 }
400 
401 static int etouch_get_pkt_len(unsigned char *buf, int len)
402 {
403 	switch (buf[0] & ETOUCH_PKT_TYPE_MASK) {
404 	case ETOUCH_PKT_TYPE_REPT:
405 	case ETOUCH_PKT_TYPE_REPT2:
406 		return 5;
407 
408 	case ETOUCH_PKT_TYPE_DIAG:
409 		if (len < 2)
410 			return -1;
411 
412 		return buf[1] + 2;
413 	}
414 
415 	return 0;
416 }
417 #endif
418 
419 /*****************************************************************************
420  * PanJit Part
421  */
422 #ifdef CONFIG_TOUCHSCREEN_USB_PANJIT
423 static int panjit_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
424 {
425 	dev->x = ((pkt[2] & 0x0F) << 8) | pkt[1];
426 	dev->y = ((pkt[4] & 0x0F) << 8) | pkt[3];
427 	dev->touch = pkt[0] & 0x01;
428 
429 	return 1;
430 }
431 #endif
432 
433 
434 /*****************************************************************************
435  * 3M/Microtouch Part
436  */
437 #ifdef CONFIG_TOUCHSCREEN_USB_3M
438 
439 #define MTOUCHUSB_ASYNC_REPORT          1
440 #define MTOUCHUSB_RESET                 7
441 #define MTOUCHUSB_REQ_CTRLLR_ID         10
442 
443 #define MTOUCHUSB_REQ_CTRLLR_ID_LEN	16
444 
445 static int mtouch_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
446 {
447 	if (hwcalib_xy) {
448 		dev->x = (pkt[4] << 8) | pkt[3];
449 		dev->y = 0xffff - ((pkt[6] << 8) | pkt[5]);
450 	} else {
451 		dev->x = (pkt[8] << 8) | pkt[7];
452 		dev->y = (pkt[10] << 8) | pkt[9];
453 	}
454 	dev->touch = (pkt[2] & 0x40) ? 1 : 0;
455 
456 	return 1;
457 }
458 
459 struct mtouch_priv {
460 	u8 fw_rev_major;
461 	u8 fw_rev_minor;
462 };
463 
464 static ssize_t mtouch_firmware_rev_show(struct device *dev,
465 				struct device_attribute *attr, char *output)
466 {
467 	struct usb_interface *intf = to_usb_interface(dev);
468 	struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);
469 	struct mtouch_priv *priv = usbtouch->priv;
470 
471 	return scnprintf(output, PAGE_SIZE, "%1x.%1x\n",
472 			 priv->fw_rev_major, priv->fw_rev_minor);
473 }
474 static DEVICE_ATTR(firmware_rev, 0444, mtouch_firmware_rev_show, NULL);
475 
476 static struct attribute *mtouch_attrs[] = {
477 	&dev_attr_firmware_rev.attr,
478 	NULL
479 };
480 
481 static const struct attribute_group mtouch_attr_group = {
482 	.attrs = mtouch_attrs,
483 };
484 
485 static int mtouch_get_fw_revision(struct usbtouch_usb *usbtouch)
486 {
487 	struct usb_device *udev = interface_to_usbdev(usbtouch->interface);
488 	struct mtouch_priv *priv = usbtouch->priv;
489 	u8 *buf;
490 	int ret;
491 
492 	buf = kzalloc(MTOUCHUSB_REQ_CTRLLR_ID_LEN, GFP_NOIO);
493 	if (!buf)
494 		return -ENOMEM;
495 
496 	ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
497 			      MTOUCHUSB_REQ_CTRLLR_ID,
498 			      USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
499 			      0, 0, buf, MTOUCHUSB_REQ_CTRLLR_ID_LEN,
500 			      USB_CTRL_SET_TIMEOUT);
501 	if (ret != MTOUCHUSB_REQ_CTRLLR_ID_LEN) {
502 		dev_warn(&usbtouch->interface->dev,
503 			 "Failed to read FW rev: %d\n", ret);
504 		ret = ret < 0 ? ret : -EIO;
505 		goto free;
506 	}
507 
508 	priv->fw_rev_major = buf[3];
509 	priv->fw_rev_minor = buf[4];
510 
511 	ret = 0;
512 
513 free:
514 	kfree(buf);
515 	return ret;
516 }
517 
518 static int mtouch_alloc(struct usbtouch_usb *usbtouch)
519 {
520 	int ret;
521 
522 	usbtouch->priv = kmalloc(sizeof(struct mtouch_priv), GFP_KERNEL);
523 	if (!usbtouch->priv)
524 		return -ENOMEM;
525 
526 	ret = sysfs_create_group(&usbtouch->interface->dev.kobj,
527 				 &mtouch_attr_group);
528 	if (ret) {
529 		kfree(usbtouch->priv);
530 		usbtouch->priv = NULL;
531 		return ret;
532 	}
533 
534 	return 0;
535 }
536 
537 static int mtouch_init(struct usbtouch_usb *usbtouch)
538 {
539 	int ret, i;
540 	struct usb_device *udev = interface_to_usbdev(usbtouch->interface);
541 
542 	ret = mtouch_get_fw_revision(usbtouch);
543 	if (ret)
544 		return ret;
545 
546 	ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
547 	                      MTOUCHUSB_RESET,
548 	                      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
549 	                      1, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
550 	dev_dbg(&usbtouch->interface->dev,
551 		"%s - usb_control_msg - MTOUCHUSB_RESET - bytes|err: %d\n",
552 		__func__, ret);
553 	if (ret < 0)
554 		return ret;
555 	msleep(150);
556 
557 	for (i = 0; i < 3; i++) {
558 		ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
559 				      MTOUCHUSB_ASYNC_REPORT,
560 				      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
561 				      1, 1, NULL, 0, USB_CTRL_SET_TIMEOUT);
562 		dev_dbg(&usbtouch->interface->dev,
563 			"%s - usb_control_msg - MTOUCHUSB_ASYNC_REPORT - bytes|err: %d\n",
564 			__func__, ret);
565 		if (ret >= 0)
566 			break;
567 		if (ret != -EPIPE)
568 			return ret;
569 	}
570 
571 	/* Default min/max xy are the raw values, override if using hw-calib */
572 	if (hwcalib_xy) {
573 		input_set_abs_params(usbtouch->input, ABS_X, 0, 0xffff, 0, 0);
574 		input_set_abs_params(usbtouch->input, ABS_Y, 0, 0xffff, 0, 0);
575 	}
576 
577 	return 0;
578 }
579 
580 static void mtouch_exit(struct usbtouch_usb *usbtouch)
581 {
582 	struct mtouch_priv *priv = usbtouch->priv;
583 
584 	sysfs_remove_group(&usbtouch->interface->dev.kobj, &mtouch_attr_group);
585 	kfree(priv);
586 }
587 #endif
588 
589 
590 /*****************************************************************************
591  * ITM Part
592  */
593 #ifdef CONFIG_TOUCHSCREEN_USB_ITM
594 static int itm_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
595 {
596 	int touch;
597 	/*
598 	 * ITM devices report invalid x/y data if not touched.
599 	 * if the screen was touched before but is not touched any more
600 	 * report touch as 0 with the last valid x/y data once. then stop
601 	 * reporting data until touched again.
602 	 */
603 	dev->press = ((pkt[2] & 0x01) << 7) | (pkt[5] & 0x7F);
604 
605 	touch = ~pkt[7] & 0x20;
606 	if (!touch) {
607 		if (dev->touch) {
608 			dev->touch = 0;
609 			return 1;
610 		}
611 
612 		return 0;
613 	}
614 
615 	dev->x = ((pkt[0] & 0x1F) << 7) | (pkt[3] & 0x7F);
616 	dev->y = ((pkt[1] & 0x1F) << 7) | (pkt[4] & 0x7F);
617 	dev->touch = touch;
618 
619 	return 1;
620 }
621 #endif
622 
623 
624 /*****************************************************************************
625  * eTurboTouch part
626  */
627 #ifdef CONFIG_TOUCHSCREEN_USB_ETURBO
628 #ifndef MULTI_PACKET
629 #define MULTI_PACKET
630 #endif
631 static int eturbo_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
632 {
633 	unsigned int shift;
634 
635 	/* packets should start with sync */
636 	if (!(pkt[0] & 0x80))
637 		return 0;
638 
639 	shift = (6 - (pkt[0] & 0x03));
640 	dev->x = ((pkt[3] << 7) | pkt[4]) >> shift;
641 	dev->y = ((pkt[1] << 7) | pkt[2]) >> shift;
642 	dev->touch = (pkt[0] & 0x10) ? 1 : 0;
643 
644 	return 1;
645 }
646 
647 static int eturbo_get_pkt_len(unsigned char *buf, int len)
648 {
649 	if (buf[0] & 0x80)
650 		return 5;
651 	if (buf[0] == 0x01)
652 		return 3;
653 	return 0;
654 }
655 #endif
656 
657 
658 /*****************************************************************************
659  * Gunze part
660  */
661 #ifdef CONFIG_TOUCHSCREEN_USB_GUNZE
662 static int gunze_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
663 {
664 	if (!(pkt[0] & 0x80) || ((pkt[1] | pkt[2] | pkt[3]) & 0x80))
665 		return 0;
666 
667 	dev->x = ((pkt[0] & 0x1F) << 7) | (pkt[2] & 0x7F);
668 	dev->y = ((pkt[1] & 0x1F) << 7) | (pkt[3] & 0x7F);
669 	dev->touch = pkt[0] & 0x20;
670 
671 	return 1;
672 }
673 #endif
674 
675 /*****************************************************************************
676  * DMC TSC-10/25 Part
677  *
678  * Documentation about the controller and it's protocol can be found at
679  *   http://www.dmccoltd.com/files/controler/tsc10usb_pi_e.pdf
680  *   http://www.dmccoltd.com/files/controler/tsc25_usb_e.pdf
681  */
682 #ifdef CONFIG_TOUCHSCREEN_USB_DMC_TSC10
683 
684 /* supported data rates. currently using 130 */
685 #define TSC10_RATE_POINT	0x50
686 #define TSC10_RATE_30		0x40
687 #define TSC10_RATE_50		0x41
688 #define TSC10_RATE_80		0x42
689 #define TSC10_RATE_100		0x43
690 #define TSC10_RATE_130		0x44
691 #define TSC10_RATE_150		0x45
692 
693 /* commands */
694 #define TSC10_CMD_RESET		0x55
695 #define TSC10_CMD_RATE		0x05
696 #define TSC10_CMD_DATA1		0x01
697 
698 static int dmc_tsc10_init(struct usbtouch_usb *usbtouch)
699 {
700 	struct usb_device *dev = interface_to_usbdev(usbtouch->interface);
701 	int ret = -ENOMEM;
702 	unsigned char *buf;
703 
704 	buf = kmalloc(2, GFP_NOIO);
705 	if (!buf)
706 		goto err_nobuf;
707 	/* reset */
708 	buf[0] = buf[1] = 0xFF;
709 	ret = usb_control_msg(dev, usb_rcvctrlpipe (dev, 0),
710 	                      TSC10_CMD_RESET,
711 	                      USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
712 	                      0, 0, buf, 2, USB_CTRL_SET_TIMEOUT);
713 	if (ret < 0)
714 		goto err_out;
715 	if (buf[0] != 0x06) {
716 		ret = -ENODEV;
717 		goto err_out;
718 	}
719 
720 	/* TSC-25 data sheet specifies a delay after the RESET command */
721 	msleep(150);
722 
723 	/* set coordinate output rate */
724 	buf[0] = buf[1] = 0xFF;
725 	ret = usb_control_msg(dev, usb_rcvctrlpipe (dev, 0),
726 	                      TSC10_CMD_RATE,
727 	                      USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
728 	                      TSC10_RATE_150, 0, buf, 2, USB_CTRL_SET_TIMEOUT);
729 	if (ret < 0)
730 		goto err_out;
731 	if ((buf[0] != 0x06) && (buf[0] != 0x15 || buf[1] != 0x01)) {
732 		ret = -ENODEV;
733 		goto err_out;
734 	}
735 
736 	/* start sending data */
737 	ret = usb_control_msg(dev, usb_rcvctrlpipe (dev, 0),
738 	                      TSC10_CMD_DATA1,
739 	                      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
740 	                      0, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
741 err_out:
742 	kfree(buf);
743 err_nobuf:
744 	return ret;
745 }
746 
747 
748 static int dmc_tsc10_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
749 {
750 	dev->x = ((pkt[2] & 0x03) << 8) | pkt[1];
751 	dev->y = ((pkt[4] & 0x03) << 8) | pkt[3];
752 	dev->touch = pkt[0] & 0x01;
753 
754 	return 1;
755 }
756 #endif
757 
758 
759 /*****************************************************************************
760  * IRTOUCH Part
761  */
762 #ifdef CONFIG_TOUCHSCREEN_USB_IRTOUCH
763 static int irtouch_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
764 {
765 	dev->x = (pkt[3] << 8) | pkt[2];
766 	dev->y = (pkt[5] << 8) | pkt[4];
767 	dev->touch = (pkt[1] & 0x03) ? 1 : 0;
768 
769 	return 1;
770 }
771 #endif
772 
773 /*****************************************************************************
774  * ET&T TC5UH/TC4UM part
775  */
776 #ifdef CONFIG_TOUCHSCREEN_USB_ETT_TC45USB
777 static int tc45usb_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
778 {
779 	dev->x = ((pkt[2] & 0x0F) << 8) | pkt[1];
780 	dev->y = ((pkt[4] & 0x0F) << 8) | pkt[3];
781 	dev->touch = pkt[0] & 0x01;
782 
783 	return 1;
784 }
785 #endif
786 
787 /*****************************************************************************
788  * IdealTEK URTC1000 Part
789  */
790 #ifdef CONFIG_TOUCHSCREEN_USB_IDEALTEK
791 #ifndef MULTI_PACKET
792 #define MULTI_PACKET
793 #endif
794 static int idealtek_get_pkt_len(unsigned char *buf, int len)
795 {
796 	if (buf[0] & 0x80)
797 		return 5;
798 	if (buf[0] == 0x01)
799 		return len;
800 	return 0;
801 }
802 
803 static int idealtek_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
804 {
805 	switch (pkt[0] & 0x98) {
806 	case 0x88:
807 		/* touch data in IdealTEK mode */
808 		dev->x = (pkt[1] << 5) | (pkt[2] >> 2);
809 		dev->y = (pkt[3] << 5) | (pkt[4] >> 2);
810 		dev->touch = (pkt[0] & 0x40) ? 1 : 0;
811 		return 1;
812 
813 	case 0x98:
814 		/* touch data in MT emulation mode */
815 		dev->x = (pkt[2] << 5) | (pkt[1] >> 2);
816 		dev->y = (pkt[4] << 5) | (pkt[3] >> 2);
817 		dev->touch = (pkt[0] & 0x40) ? 1 : 0;
818 		return 1;
819 
820 	default:
821 		return 0;
822 	}
823 }
824 #endif
825 
826 /*****************************************************************************
827  * General Touch Part
828  */
829 #ifdef CONFIG_TOUCHSCREEN_USB_GENERAL_TOUCH
830 static int general_touch_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
831 {
832 	dev->x = (pkt[2] << 8) | pkt[1];
833 	dev->y = (pkt[4] << 8) | pkt[3];
834 	dev->press = pkt[5] & 0xff;
835 	dev->touch = pkt[0] & 0x01;
836 
837 	return 1;
838 }
839 #endif
840 
841 /*****************************************************************************
842  * GoTop Part
843  */
844 #ifdef CONFIG_TOUCHSCREEN_USB_GOTOP
845 static int gotop_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
846 {
847 	dev->x = ((pkt[1] & 0x38) << 4) | pkt[2];
848 	dev->y = ((pkt[1] & 0x07) << 7) | pkt[3];
849 	dev->touch = pkt[0] & 0x01;
850 
851 	return 1;
852 }
853 #endif
854 
855 /*****************************************************************************
856  * JASTEC Part
857  */
858 #ifdef CONFIG_TOUCHSCREEN_USB_JASTEC
859 static int jastec_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
860 {
861 	dev->x = ((pkt[0] & 0x3f) << 6) | (pkt[2] & 0x3f);
862 	dev->y = ((pkt[1] & 0x3f) << 6) | (pkt[3] & 0x3f);
863 	dev->touch = (pkt[0] & 0x40) >> 6;
864 
865 	return 1;
866 }
867 #endif
868 
869 /*****************************************************************************
870  * Zytronic Part
871  */
872 #ifdef CONFIG_TOUCHSCREEN_USB_ZYTRONIC
873 static int zytronic_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
874 {
875 	struct usb_interface *intf = dev->interface;
876 
877 	switch (pkt[0]) {
878 	case 0x3A: /* command response */
879 		dev_dbg(&intf->dev, "%s: Command response %d\n", __func__, pkt[1]);
880 		break;
881 
882 	case 0xC0: /* down */
883 		dev->x = (pkt[1] & 0x7f) | ((pkt[2] & 0x07) << 7);
884 		dev->y = (pkt[3] & 0x7f) | ((pkt[4] & 0x07) << 7);
885 		dev->touch = 1;
886 		dev_dbg(&intf->dev, "%s: down %d,%d\n", __func__, dev->x, dev->y);
887 		return 1;
888 
889 	case 0x80: /* up */
890 		dev->x = (pkt[1] & 0x7f) | ((pkt[2] & 0x07) << 7);
891 		dev->y = (pkt[3] & 0x7f) | ((pkt[4] & 0x07) << 7);
892 		dev->touch = 0;
893 		dev_dbg(&intf->dev, "%s: up %d,%d\n", __func__, dev->x, dev->y);
894 		return 1;
895 
896 	default:
897 		dev_dbg(&intf->dev, "%s: Unknown return %d\n", __func__, pkt[0]);
898 		break;
899 	}
900 
901 	return 0;
902 }
903 #endif
904 
905 /*****************************************************************************
906  * NEXIO Part
907  */
908 #ifdef CONFIG_TOUCHSCREEN_USB_NEXIO
909 
910 #define NEXIO_TIMEOUT	5000
911 #define NEXIO_BUFSIZE	1024
912 #define NEXIO_THRESHOLD	50
913 
914 struct nexio_priv {
915 	struct urb *ack;
916 	unsigned char *ack_buf;
917 };
918 
919 struct nexio_touch_packet {
920 	u8	flags;		/* 0xe1 = touch, 0xe1 = release */
921 	__be16	data_len;	/* total bytes of touch data */
922 	__be16	x_len;		/* bytes for X axis */
923 	__be16	y_len;		/* bytes for Y axis */
924 	u8	data[];
925 } __attribute__ ((packed));
926 
927 static unsigned char nexio_ack_pkt[2] = { 0xaa, 0x02 };
928 static unsigned char nexio_init_pkt[4] = { 0x82, 0x04, 0x0a, 0x0f };
929 
930 static void nexio_ack_complete(struct urb *urb)
931 {
932 }
933 
934 static int nexio_alloc(struct usbtouch_usb *usbtouch)
935 {
936 	struct nexio_priv *priv;
937 	int ret = -ENOMEM;
938 
939 	usbtouch->priv = kmalloc(sizeof(struct nexio_priv), GFP_KERNEL);
940 	if (!usbtouch->priv)
941 		goto out_buf;
942 
943 	priv = usbtouch->priv;
944 
945 	priv->ack_buf = kmemdup(nexio_ack_pkt, sizeof(nexio_ack_pkt),
946 				GFP_KERNEL);
947 	if (!priv->ack_buf)
948 		goto err_priv;
949 
950 	priv->ack = usb_alloc_urb(0, GFP_KERNEL);
951 	if (!priv->ack) {
952 		dev_dbg(&usbtouch->interface->dev,
953 			"%s - usb_alloc_urb failed: usbtouch->ack\n", __func__);
954 		goto err_ack_buf;
955 	}
956 
957 	return 0;
958 
959 err_ack_buf:
960 	kfree(priv->ack_buf);
961 err_priv:
962 	kfree(priv);
963 out_buf:
964 	return ret;
965 }
966 
967 static int nexio_init(struct usbtouch_usb *usbtouch)
968 {
969 	struct usb_device *dev = interface_to_usbdev(usbtouch->interface);
970 	struct usb_host_interface *interface = usbtouch->interface->cur_altsetting;
971 	struct nexio_priv *priv = usbtouch->priv;
972 	int ret = -ENOMEM;
973 	int actual_len, i;
974 	unsigned char *buf;
975 	char *firmware_ver = NULL, *device_name = NULL;
976 	int input_ep = 0, output_ep = 0;
977 
978 	/* find first input and output endpoint */
979 	for (i = 0; i < interface->desc.bNumEndpoints; i++) {
980 		if (!input_ep &&
981 		    usb_endpoint_dir_in(&interface->endpoint[i].desc))
982 			input_ep = interface->endpoint[i].desc.bEndpointAddress;
983 		if (!output_ep &&
984 		    usb_endpoint_dir_out(&interface->endpoint[i].desc))
985 			output_ep = interface->endpoint[i].desc.bEndpointAddress;
986 	}
987 	if (!input_ep || !output_ep)
988 		return -ENXIO;
989 
990 	buf = kmalloc(NEXIO_BUFSIZE, GFP_NOIO);
991 	if (!buf)
992 		goto out_buf;
993 
994 	/* two empty reads */
995 	for (i = 0; i < 2; i++) {
996 		ret = usb_bulk_msg(dev, usb_rcvbulkpipe(dev, input_ep),
997 				   buf, NEXIO_BUFSIZE, &actual_len,
998 				   NEXIO_TIMEOUT);
999 		if (ret < 0)
1000 			goto out_buf;
1001 	}
1002 
1003 	/* send init command */
1004 	memcpy(buf, nexio_init_pkt, sizeof(nexio_init_pkt));
1005 	ret = usb_bulk_msg(dev, usb_sndbulkpipe(dev, output_ep),
1006 			   buf, sizeof(nexio_init_pkt), &actual_len,
1007 			   NEXIO_TIMEOUT);
1008 	if (ret < 0)
1009 		goto out_buf;
1010 
1011 	/* read replies */
1012 	for (i = 0; i < 3; i++) {
1013 		memset(buf, 0, NEXIO_BUFSIZE);
1014 		ret = usb_bulk_msg(dev, usb_rcvbulkpipe(dev, input_ep),
1015 				   buf, NEXIO_BUFSIZE, &actual_len,
1016 				   NEXIO_TIMEOUT);
1017 		if (ret < 0 || actual_len < 1 || buf[1] != actual_len)
1018 			continue;
1019 		switch (buf[0]) {
1020 		case 0x83:	/* firmware version */
1021 			if (!firmware_ver)
1022 				firmware_ver = kstrdup(&buf[2], GFP_NOIO);
1023 			break;
1024 		case 0x84:	/* device name */
1025 			if (!device_name)
1026 				device_name = kstrdup(&buf[2], GFP_NOIO);
1027 			break;
1028 		}
1029 	}
1030 
1031 	printk(KERN_INFO "Nexio device: %s, firmware version: %s\n",
1032 	       device_name, firmware_ver);
1033 
1034 	kfree(firmware_ver);
1035 	kfree(device_name);
1036 
1037 	usb_fill_bulk_urb(priv->ack, dev, usb_sndbulkpipe(dev, output_ep),
1038 			  priv->ack_buf, sizeof(nexio_ack_pkt),
1039 			  nexio_ack_complete, usbtouch);
1040 	ret = 0;
1041 
1042 out_buf:
1043 	kfree(buf);
1044 	return ret;
1045 }
1046 
1047 static void nexio_exit(struct usbtouch_usb *usbtouch)
1048 {
1049 	struct nexio_priv *priv = usbtouch->priv;
1050 
1051 	usb_kill_urb(priv->ack);
1052 	usb_free_urb(priv->ack);
1053 	kfree(priv->ack_buf);
1054 	kfree(priv);
1055 }
1056 
1057 static int nexio_read_data(struct usbtouch_usb *usbtouch, unsigned char *pkt)
1058 {
1059 	struct nexio_touch_packet *packet = (void *) pkt;
1060 	struct nexio_priv *priv = usbtouch->priv;
1061 	unsigned int data_len = be16_to_cpu(packet->data_len);
1062 	unsigned int x_len = be16_to_cpu(packet->x_len);
1063 	unsigned int y_len = be16_to_cpu(packet->y_len);
1064 	int x, y, begin_x, begin_y, end_x, end_y, w, h, ret;
1065 
1066 	/* got touch data? */
1067 	if ((pkt[0] & 0xe0) != 0xe0)
1068 		return 0;
1069 
1070 	if (data_len > 0xff)
1071 		data_len -= 0x100;
1072 	if (x_len > 0xff)
1073 		x_len -= 0x80;
1074 
1075 	/* send ACK */
1076 	ret = usb_submit_urb(priv->ack, GFP_ATOMIC);
1077 
1078 	if (!usbtouch->type->max_xc) {
1079 		usbtouch->type->max_xc = 2 * x_len;
1080 		input_set_abs_params(usbtouch->input, ABS_X,
1081 				     0, usbtouch->type->max_xc, 0, 0);
1082 		usbtouch->type->max_yc = 2 * y_len;
1083 		input_set_abs_params(usbtouch->input, ABS_Y,
1084 				     0, usbtouch->type->max_yc, 0, 0);
1085 	}
1086 	/*
1087 	 * The device reports state of IR sensors on X and Y axes.
1088 	 * Each byte represents "darkness" percentage (0-100) of one element.
1089 	 * 17" touchscreen reports only 64 x 52 bytes so the resolution is low.
1090 	 * This also means that there's a limited multi-touch capability but
1091 	 * it's disabled (and untested) here as there's no X driver for that.
1092 	 */
1093 	begin_x = end_x = begin_y = end_y = -1;
1094 	for (x = 0; x < x_len; x++) {
1095 		if (begin_x == -1 && packet->data[x] > NEXIO_THRESHOLD) {
1096 			begin_x = x;
1097 			continue;
1098 		}
1099 		if (end_x == -1 && begin_x != -1 && packet->data[x] < NEXIO_THRESHOLD) {
1100 			end_x = x - 1;
1101 			for (y = x_len; y < data_len; y++) {
1102 				if (begin_y == -1 && packet->data[y] > NEXIO_THRESHOLD) {
1103 					begin_y = y - x_len;
1104 					continue;
1105 				}
1106 				if (end_y == -1 &&
1107 				    begin_y != -1 && packet->data[y] < NEXIO_THRESHOLD) {
1108 					end_y = y - 1 - x_len;
1109 					w = end_x - begin_x;
1110 					h = end_y - begin_y;
1111 #if 0
1112 					/* multi-touch */
1113 					input_report_abs(usbtouch->input,
1114 						    ABS_MT_TOUCH_MAJOR, max(w,h));
1115 					input_report_abs(usbtouch->input,
1116 						    ABS_MT_TOUCH_MINOR, min(x,h));
1117 					input_report_abs(usbtouch->input,
1118 						    ABS_MT_POSITION_X, 2*begin_x+w);
1119 					input_report_abs(usbtouch->input,
1120 						    ABS_MT_POSITION_Y, 2*begin_y+h);
1121 					input_report_abs(usbtouch->input,
1122 						    ABS_MT_ORIENTATION, w > h);
1123 					input_mt_sync(usbtouch->input);
1124 #endif
1125 					/* single touch */
1126 					usbtouch->x = 2 * begin_x + w;
1127 					usbtouch->y = 2 * begin_y + h;
1128 					usbtouch->touch = packet->flags & 0x01;
1129 					begin_y = end_y = -1;
1130 					return 1;
1131 				}
1132 			}
1133 			begin_x = end_x = -1;
1134 		}
1135 
1136 	}
1137 	return 0;
1138 }
1139 #endif
1140 
1141 
1142 /*****************************************************************************
1143  * ELO part
1144  */
1145 
1146 #ifdef CONFIG_TOUCHSCREEN_USB_ELO
1147 
1148 static int elo_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
1149 {
1150 	dev->x = (pkt[3] << 8) | pkt[2];
1151 	dev->y = (pkt[5] << 8) | pkt[4];
1152 	dev->touch = pkt[6] > 0;
1153 	dev->press = pkt[6];
1154 
1155 	return 1;
1156 }
1157 #endif
1158 
1159 
1160 /*****************************************************************************
1161  * the different device descriptors
1162  */
1163 #ifdef MULTI_PACKET
1164 static void usbtouch_process_multi(struct usbtouch_usb *usbtouch,
1165 				   unsigned char *pkt, int len);
1166 #endif
1167 
1168 static struct usbtouch_device_info usbtouch_dev_info[] = {
1169 #ifdef CONFIG_TOUCHSCREEN_USB_ELO
1170 	[DEVTYPE_ELO] = {
1171 		.min_xc		= 0x0,
1172 		.max_xc		= 0x0fff,
1173 		.min_yc		= 0x0,
1174 		.max_yc		= 0x0fff,
1175 		.max_press	= 0xff,
1176 		.rept_size	= 8,
1177 		.read_data	= elo_read_data,
1178 	},
1179 #endif
1180 
1181 #ifdef CONFIG_TOUCHSCREEN_USB_EGALAX
1182 	[DEVTYPE_EGALAX] = {
1183 		.min_xc		= 0x0,
1184 		.max_xc		= 0x07ff,
1185 		.min_yc		= 0x0,
1186 		.max_yc		= 0x07ff,
1187 		.rept_size	= 16,
1188 		.process_pkt	= usbtouch_process_multi,
1189 		.get_pkt_len	= egalax_get_pkt_len,
1190 		.read_data	= egalax_read_data,
1191 		.init		= egalax_init,
1192 	},
1193 #endif
1194 
1195 #ifdef CONFIG_TOUCHSCREEN_USB_PANJIT
1196 	[DEVTYPE_PANJIT] = {
1197 		.min_xc		= 0x0,
1198 		.max_xc		= 0x0fff,
1199 		.min_yc		= 0x0,
1200 		.max_yc		= 0x0fff,
1201 		.rept_size	= 8,
1202 		.read_data	= panjit_read_data,
1203 	},
1204 #endif
1205 
1206 #ifdef CONFIG_TOUCHSCREEN_USB_3M
1207 	[DEVTYPE_3M] = {
1208 		.min_xc		= 0x0,
1209 		.max_xc		= 0x4000,
1210 		.min_yc		= 0x0,
1211 		.max_yc		= 0x4000,
1212 		.rept_size	= 11,
1213 		.read_data	= mtouch_read_data,
1214 		.alloc		= mtouch_alloc,
1215 		.init		= mtouch_init,
1216 		.exit		= mtouch_exit,
1217 	},
1218 #endif
1219 
1220 #ifdef CONFIG_TOUCHSCREEN_USB_ITM
1221 	[DEVTYPE_ITM] = {
1222 		.min_xc		= 0x0,
1223 		.max_xc		= 0x0fff,
1224 		.min_yc		= 0x0,
1225 		.max_yc		= 0x0fff,
1226 		.max_press	= 0xff,
1227 		.rept_size	= 8,
1228 		.read_data	= itm_read_data,
1229 	},
1230 #endif
1231 
1232 #ifdef CONFIG_TOUCHSCREEN_USB_ETURBO
1233 	[DEVTYPE_ETURBO] = {
1234 		.min_xc		= 0x0,
1235 		.max_xc		= 0x07ff,
1236 		.min_yc		= 0x0,
1237 		.max_yc		= 0x07ff,
1238 		.rept_size	= 8,
1239 		.process_pkt	= usbtouch_process_multi,
1240 		.get_pkt_len	= eturbo_get_pkt_len,
1241 		.read_data	= eturbo_read_data,
1242 	},
1243 #endif
1244 
1245 #ifdef CONFIG_TOUCHSCREEN_USB_GUNZE
1246 	[DEVTYPE_GUNZE] = {
1247 		.min_xc		= 0x0,
1248 		.max_xc		= 0x0fff,
1249 		.min_yc		= 0x0,
1250 		.max_yc		= 0x0fff,
1251 		.rept_size	= 4,
1252 		.read_data	= gunze_read_data,
1253 	},
1254 #endif
1255 
1256 #ifdef CONFIG_TOUCHSCREEN_USB_DMC_TSC10
1257 	[DEVTYPE_DMC_TSC10] = {
1258 		.min_xc		= 0x0,
1259 		.max_xc		= 0x03ff,
1260 		.min_yc		= 0x0,
1261 		.max_yc		= 0x03ff,
1262 		.rept_size	= 5,
1263 		.init		= dmc_tsc10_init,
1264 		.read_data	= dmc_tsc10_read_data,
1265 	},
1266 #endif
1267 
1268 #ifdef CONFIG_TOUCHSCREEN_USB_IRTOUCH
1269 	[DEVTYPE_IRTOUCH] = {
1270 		.min_xc		= 0x0,
1271 		.max_xc		= 0x0fff,
1272 		.min_yc		= 0x0,
1273 		.max_yc		= 0x0fff,
1274 		.rept_size	= 8,
1275 		.read_data	= irtouch_read_data,
1276 	},
1277 
1278 	[DEVTYPE_IRTOUCH_HIRES] = {
1279 		.min_xc		= 0x0,
1280 		.max_xc		= 0x7fff,
1281 		.min_yc		= 0x0,
1282 		.max_yc		= 0x7fff,
1283 		.rept_size	= 8,
1284 		.read_data	= irtouch_read_data,
1285 	},
1286 #endif
1287 
1288 #ifdef CONFIG_TOUCHSCREEN_USB_IDEALTEK
1289 	[DEVTYPE_IDEALTEK] = {
1290 		.min_xc		= 0x0,
1291 		.max_xc		= 0x0fff,
1292 		.min_yc		= 0x0,
1293 		.max_yc		= 0x0fff,
1294 		.rept_size	= 8,
1295 		.process_pkt	= usbtouch_process_multi,
1296 		.get_pkt_len	= idealtek_get_pkt_len,
1297 		.read_data	= idealtek_read_data,
1298 	},
1299 #endif
1300 
1301 #ifdef CONFIG_TOUCHSCREEN_USB_GENERAL_TOUCH
1302 	[DEVTYPE_GENERAL_TOUCH] = {
1303 		.min_xc		= 0x0,
1304 		.max_xc		= 0x7fff,
1305 		.min_yc		= 0x0,
1306 		.max_yc		= 0x7fff,
1307 		.rept_size	= 7,
1308 		.read_data	= general_touch_read_data,
1309 	},
1310 #endif
1311 
1312 #ifdef CONFIG_TOUCHSCREEN_USB_GOTOP
1313 	[DEVTYPE_GOTOP] = {
1314 		.min_xc		= 0x0,
1315 		.max_xc		= 0x03ff,
1316 		.min_yc		= 0x0,
1317 		.max_yc		= 0x03ff,
1318 		.rept_size	= 4,
1319 		.read_data	= gotop_read_data,
1320 	},
1321 #endif
1322 
1323 #ifdef CONFIG_TOUCHSCREEN_USB_JASTEC
1324 	[DEVTYPE_JASTEC] = {
1325 		.min_xc		= 0x0,
1326 		.max_xc		= 0x0fff,
1327 		.min_yc		= 0x0,
1328 		.max_yc		= 0x0fff,
1329 		.rept_size	= 4,
1330 		.read_data	= jastec_read_data,
1331 	},
1332 #endif
1333 
1334 #ifdef CONFIG_TOUCHSCREEN_USB_E2I
1335 	[DEVTYPE_E2I] = {
1336 		.min_xc		= 0x0,
1337 		.max_xc		= 0x7fff,
1338 		.min_yc		= 0x0,
1339 		.max_yc		= 0x7fff,
1340 		.rept_size	= 6,
1341 		.init		= e2i_init,
1342 		.read_data	= e2i_read_data,
1343 	},
1344 #endif
1345 
1346 #ifdef CONFIG_TOUCHSCREEN_USB_ZYTRONIC
1347 	[DEVTYPE_ZYTRONIC] = {
1348 		.min_xc		= 0x0,
1349 		.max_xc		= 0x03ff,
1350 		.min_yc		= 0x0,
1351 		.max_yc		= 0x03ff,
1352 		.rept_size	= 5,
1353 		.read_data	= zytronic_read_data,
1354 		.irq_always     = true,
1355 	},
1356 #endif
1357 
1358 #ifdef CONFIG_TOUCHSCREEN_USB_ETT_TC45USB
1359 	[DEVTYPE_TC45USB] = {
1360 		.min_xc		= 0x0,
1361 		.max_xc		= 0x0fff,
1362 		.min_yc		= 0x0,
1363 		.max_yc		= 0x0fff,
1364 		.rept_size	= 5,
1365 		.read_data	= tc45usb_read_data,
1366 	},
1367 #endif
1368 
1369 #ifdef CONFIG_TOUCHSCREEN_USB_NEXIO
1370 	[DEVTYPE_NEXIO] = {
1371 		.rept_size	= 1024,
1372 		.irq_always	= true,
1373 		.read_data	= nexio_read_data,
1374 		.alloc		= nexio_alloc,
1375 		.init		= nexio_init,
1376 		.exit		= nexio_exit,
1377 	},
1378 #endif
1379 #ifdef CONFIG_TOUCHSCREEN_USB_EASYTOUCH
1380 	[DEVTYPE_ETOUCH] = {
1381 		.min_xc		= 0x0,
1382 		.max_xc		= 0x07ff,
1383 		.min_yc		= 0x0,
1384 		.max_yc		= 0x07ff,
1385 		.rept_size	= 16,
1386 		.process_pkt	= usbtouch_process_multi,
1387 		.get_pkt_len	= etouch_get_pkt_len,
1388 		.read_data	= etouch_read_data,
1389 	},
1390 #endif
1391 };
1392 
1393 
1394 /*****************************************************************************
1395  * Generic Part
1396  */
1397 static void usbtouch_process_pkt(struct usbtouch_usb *usbtouch,
1398                                  unsigned char *pkt, int len)
1399 {
1400 	struct usbtouch_device_info *type = usbtouch->type;
1401 
1402 	if (!type->read_data(usbtouch, pkt))
1403 			return;
1404 
1405 	input_report_key(usbtouch->input, BTN_TOUCH, usbtouch->touch);
1406 
1407 	if (swap_xy) {
1408 		input_report_abs(usbtouch->input, ABS_X, usbtouch->y);
1409 		input_report_abs(usbtouch->input, ABS_Y, usbtouch->x);
1410 	} else {
1411 		input_report_abs(usbtouch->input, ABS_X, usbtouch->x);
1412 		input_report_abs(usbtouch->input, ABS_Y, usbtouch->y);
1413 	}
1414 	if (type->max_press)
1415 		input_report_abs(usbtouch->input, ABS_PRESSURE, usbtouch->press);
1416 	input_sync(usbtouch->input);
1417 }
1418 
1419 
1420 #ifdef MULTI_PACKET
1421 static void usbtouch_process_multi(struct usbtouch_usb *usbtouch,
1422                                    unsigned char *pkt, int len)
1423 {
1424 	unsigned char *buffer;
1425 	int pkt_len, pos, buf_len, tmp;
1426 
1427 	/* process buffer */
1428 	if (unlikely(usbtouch->buf_len)) {
1429 		/* try to get size */
1430 		pkt_len = usbtouch->type->get_pkt_len(
1431 				usbtouch->buffer, usbtouch->buf_len);
1432 
1433 		/* drop? */
1434 		if (unlikely(!pkt_len))
1435 			goto out_flush_buf;
1436 
1437 		/* need to append -pkt_len bytes before able to get size */
1438 		if (unlikely(pkt_len < 0)) {
1439 			int append = -pkt_len;
1440 			if (unlikely(append > len))
1441 			       append = len;
1442 			if (usbtouch->buf_len + append >= usbtouch->type->rept_size)
1443 				goto out_flush_buf;
1444 			memcpy(usbtouch->buffer + usbtouch->buf_len, pkt, append);
1445 			usbtouch->buf_len += append;
1446 
1447 			pkt_len = usbtouch->type->get_pkt_len(
1448 					usbtouch->buffer, usbtouch->buf_len);
1449 			if (pkt_len < 0)
1450 				return;
1451 		}
1452 
1453 		/* append */
1454 		tmp = pkt_len - usbtouch->buf_len;
1455 		if (usbtouch->buf_len + tmp >= usbtouch->type->rept_size)
1456 			goto out_flush_buf;
1457 		memcpy(usbtouch->buffer + usbtouch->buf_len, pkt, tmp);
1458 		usbtouch_process_pkt(usbtouch, usbtouch->buffer, pkt_len);
1459 
1460 		buffer = pkt + tmp;
1461 		buf_len = len - tmp;
1462 	} else {
1463 		buffer = pkt;
1464 		buf_len = len;
1465 	}
1466 
1467 	/* loop over the received packet, process */
1468 	pos = 0;
1469 	while (pos < buf_len) {
1470 		/* get packet len */
1471 		pkt_len = usbtouch->type->get_pkt_len(buffer + pos,
1472 							buf_len - pos);
1473 
1474 		/* unknown packet: skip one byte */
1475 		if (unlikely(!pkt_len)) {
1476 			pos++;
1477 			continue;
1478 		}
1479 
1480 		/* full packet: process */
1481 		if (likely((pkt_len > 0) && (pkt_len <= buf_len - pos))) {
1482 			usbtouch_process_pkt(usbtouch, buffer + pos, pkt_len);
1483 		} else {
1484 			/* incomplete packet: save in buffer */
1485 			memcpy(usbtouch->buffer, buffer + pos, buf_len - pos);
1486 			usbtouch->buf_len = buf_len - pos;
1487 			return;
1488 		}
1489 		pos += pkt_len;
1490 	}
1491 
1492 out_flush_buf:
1493 	usbtouch->buf_len = 0;
1494 	return;
1495 }
1496 #endif
1497 
1498 
1499 static void usbtouch_irq(struct urb *urb)
1500 {
1501 	struct usbtouch_usb *usbtouch = urb->context;
1502 	struct device *dev = &usbtouch->interface->dev;
1503 	int retval;
1504 
1505 	switch (urb->status) {
1506 	case 0:
1507 		/* success */
1508 		break;
1509 	case -ETIME:
1510 		/* this urb is timing out */
1511 		dev_dbg(dev,
1512 			"%s - urb timed out - was the device unplugged?\n",
1513 			__func__);
1514 		return;
1515 	case -ECONNRESET:
1516 	case -ENOENT:
1517 	case -ESHUTDOWN:
1518 	case -EPIPE:
1519 		/* this urb is terminated, clean up */
1520 		dev_dbg(dev, "%s - urb shutting down with status: %d\n",
1521 			__func__, urb->status);
1522 		return;
1523 	default:
1524 		dev_dbg(dev, "%s - nonzero urb status received: %d\n",
1525 			__func__, urb->status);
1526 		goto exit;
1527 	}
1528 
1529 	usbtouch->type->process_pkt(usbtouch, usbtouch->data, urb->actual_length);
1530 
1531 exit:
1532 	usb_mark_last_busy(interface_to_usbdev(usbtouch->interface));
1533 	retval = usb_submit_urb(urb, GFP_ATOMIC);
1534 	if (retval)
1535 		dev_err(dev, "%s - usb_submit_urb failed with result: %d\n",
1536 			__func__, retval);
1537 }
1538 
1539 static int usbtouch_open(struct input_dev *input)
1540 {
1541 	struct usbtouch_usb *usbtouch = input_get_drvdata(input);
1542 	int r;
1543 
1544 	usbtouch->irq->dev = interface_to_usbdev(usbtouch->interface);
1545 
1546 	r = usb_autopm_get_interface(usbtouch->interface) ? -EIO : 0;
1547 	if (r < 0)
1548 		goto out;
1549 
1550 	mutex_lock(&usbtouch->pm_mutex);
1551 	if (!usbtouch->type->irq_always) {
1552 		if (usb_submit_urb(usbtouch->irq, GFP_KERNEL)) {
1553 			r = -EIO;
1554 			goto out_put;
1555 		}
1556 	}
1557 
1558 	usbtouch->interface->needs_remote_wakeup = 1;
1559 	usbtouch->is_open = true;
1560 out_put:
1561 	mutex_unlock(&usbtouch->pm_mutex);
1562 	usb_autopm_put_interface(usbtouch->interface);
1563 out:
1564 	return r;
1565 }
1566 
1567 static void usbtouch_close(struct input_dev *input)
1568 {
1569 	struct usbtouch_usb *usbtouch = input_get_drvdata(input);
1570 	int r;
1571 
1572 	mutex_lock(&usbtouch->pm_mutex);
1573 	if (!usbtouch->type->irq_always)
1574 		usb_kill_urb(usbtouch->irq);
1575 	usbtouch->is_open = false;
1576 	mutex_unlock(&usbtouch->pm_mutex);
1577 
1578 	r = usb_autopm_get_interface(usbtouch->interface);
1579 	usbtouch->interface->needs_remote_wakeup = 0;
1580 	if (!r)
1581 		usb_autopm_put_interface(usbtouch->interface);
1582 }
1583 
1584 static int usbtouch_suspend
1585 (struct usb_interface *intf, pm_message_t message)
1586 {
1587 	struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);
1588 
1589 	usb_kill_urb(usbtouch->irq);
1590 
1591 	return 0;
1592 }
1593 
1594 static int usbtouch_resume(struct usb_interface *intf)
1595 {
1596 	struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);
1597 	int result = 0;
1598 
1599 	mutex_lock(&usbtouch->pm_mutex);
1600 	if (usbtouch->is_open || usbtouch->type->irq_always)
1601 		result = usb_submit_urb(usbtouch->irq, GFP_NOIO);
1602 	mutex_unlock(&usbtouch->pm_mutex);
1603 
1604 	return result;
1605 }
1606 
1607 static int usbtouch_reset_resume(struct usb_interface *intf)
1608 {
1609 	struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);
1610 	int err = 0;
1611 
1612 	/* reinit the device */
1613 	if (usbtouch->type->init) {
1614 		err = usbtouch->type->init(usbtouch);
1615 		if (err) {
1616 			dev_dbg(&intf->dev,
1617 				"%s - type->init() failed, err: %d\n",
1618 				__func__, err);
1619 			return err;
1620 		}
1621 	}
1622 
1623 	/* restart IO if needed */
1624 	mutex_lock(&usbtouch->pm_mutex);
1625 	if (usbtouch->is_open)
1626 		err = usb_submit_urb(usbtouch->irq, GFP_NOIO);
1627 	mutex_unlock(&usbtouch->pm_mutex);
1628 
1629 	return err;
1630 }
1631 
1632 static void usbtouch_free_buffers(struct usb_device *udev,
1633 				  struct usbtouch_usb *usbtouch)
1634 {
1635 	usb_free_coherent(udev, usbtouch->data_size,
1636 			  usbtouch->data, usbtouch->data_dma);
1637 	kfree(usbtouch->buffer);
1638 }
1639 
1640 static struct usb_endpoint_descriptor *
1641 usbtouch_get_input_endpoint(struct usb_host_interface *interface)
1642 {
1643 	int i;
1644 
1645 	for (i = 0; i < interface->desc.bNumEndpoints; i++)
1646 		if (usb_endpoint_dir_in(&interface->endpoint[i].desc))
1647 			return &interface->endpoint[i].desc;
1648 
1649 	return NULL;
1650 }
1651 
1652 static int usbtouch_probe(struct usb_interface *intf,
1653 			  const struct usb_device_id *id)
1654 {
1655 	struct usbtouch_usb *usbtouch;
1656 	struct input_dev *input_dev;
1657 	struct usb_endpoint_descriptor *endpoint;
1658 	struct usb_device *udev = interface_to_usbdev(intf);
1659 	struct usbtouch_device_info *type;
1660 	int err = -ENOMEM;
1661 
1662 	/* some devices are ignored */
1663 	if (id->driver_info == DEVTYPE_IGNORE)
1664 		return -ENODEV;
1665 
1666 	endpoint = usbtouch_get_input_endpoint(intf->cur_altsetting);
1667 	if (!endpoint)
1668 		return -ENXIO;
1669 
1670 	usbtouch = kzalloc(sizeof(struct usbtouch_usb), GFP_KERNEL);
1671 	input_dev = input_allocate_device();
1672 	if (!usbtouch || !input_dev)
1673 		goto out_free;
1674 
1675 	type = &usbtouch_dev_info[id->driver_info];
1676 	usbtouch->type = type;
1677 	if (!type->process_pkt)
1678 		type->process_pkt = usbtouch_process_pkt;
1679 
1680 	usbtouch->data_size = type->rept_size;
1681 	if (type->get_pkt_len) {
1682 		/*
1683 		 * When dealing with variable-length packets we should
1684 		 * not request more than wMaxPacketSize bytes at once
1685 		 * as we do not know if there is more data coming or
1686 		 * we filled exactly wMaxPacketSize bytes and there is
1687 		 * nothing else.
1688 		 */
1689 		usbtouch->data_size = min(usbtouch->data_size,
1690 					  usb_endpoint_maxp(endpoint));
1691 	}
1692 
1693 	usbtouch->data = usb_alloc_coherent(udev, usbtouch->data_size,
1694 					    GFP_KERNEL, &usbtouch->data_dma);
1695 	if (!usbtouch->data)
1696 		goto out_free;
1697 
1698 	if (type->get_pkt_len) {
1699 		usbtouch->buffer = kmalloc(type->rept_size, GFP_KERNEL);
1700 		if (!usbtouch->buffer)
1701 			goto out_free_buffers;
1702 	}
1703 
1704 	usbtouch->irq = usb_alloc_urb(0, GFP_KERNEL);
1705 	if (!usbtouch->irq) {
1706 		dev_dbg(&intf->dev,
1707 			"%s - usb_alloc_urb failed: usbtouch->irq\n", __func__);
1708 		goto out_free_buffers;
1709 	}
1710 
1711 	usbtouch->interface = intf;
1712 	usbtouch->input = input_dev;
1713 
1714 	if (udev->manufacturer)
1715 		strlcpy(usbtouch->name, udev->manufacturer, sizeof(usbtouch->name));
1716 
1717 	if (udev->product) {
1718 		if (udev->manufacturer)
1719 			strlcat(usbtouch->name, " ", sizeof(usbtouch->name));
1720 		strlcat(usbtouch->name, udev->product, sizeof(usbtouch->name));
1721 	}
1722 
1723 	if (!strlen(usbtouch->name))
1724 		snprintf(usbtouch->name, sizeof(usbtouch->name),
1725 			"USB Touchscreen %04x:%04x",
1726 			 le16_to_cpu(udev->descriptor.idVendor),
1727 			 le16_to_cpu(udev->descriptor.idProduct));
1728 
1729 	usb_make_path(udev, usbtouch->phys, sizeof(usbtouch->phys));
1730 	strlcat(usbtouch->phys, "/input0", sizeof(usbtouch->phys));
1731 
1732 	input_dev->name = usbtouch->name;
1733 	input_dev->phys = usbtouch->phys;
1734 	usb_to_input_id(udev, &input_dev->id);
1735 	input_dev->dev.parent = &intf->dev;
1736 
1737 	input_set_drvdata(input_dev, usbtouch);
1738 
1739 	input_dev->open = usbtouch_open;
1740 	input_dev->close = usbtouch_close;
1741 
1742 	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
1743 	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
1744 	input_set_abs_params(input_dev, ABS_X, type->min_xc, type->max_xc, 0, 0);
1745 	input_set_abs_params(input_dev, ABS_Y, type->min_yc, type->max_yc, 0, 0);
1746 	if (type->max_press)
1747 		input_set_abs_params(input_dev, ABS_PRESSURE, type->min_press,
1748 		                     type->max_press, 0, 0);
1749 
1750 	if (usb_endpoint_type(endpoint) == USB_ENDPOINT_XFER_INT)
1751 		usb_fill_int_urb(usbtouch->irq, udev,
1752 			 usb_rcvintpipe(udev, endpoint->bEndpointAddress),
1753 			 usbtouch->data, usbtouch->data_size,
1754 			 usbtouch_irq, usbtouch, endpoint->bInterval);
1755 	else
1756 		usb_fill_bulk_urb(usbtouch->irq, udev,
1757 			 usb_rcvbulkpipe(udev, endpoint->bEndpointAddress),
1758 			 usbtouch->data, usbtouch->data_size,
1759 			 usbtouch_irq, usbtouch);
1760 
1761 	usbtouch->irq->dev = udev;
1762 	usbtouch->irq->transfer_dma = usbtouch->data_dma;
1763 	usbtouch->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1764 
1765 	/* device specific allocations */
1766 	if (type->alloc) {
1767 		err = type->alloc(usbtouch);
1768 		if (err) {
1769 			dev_dbg(&intf->dev,
1770 				"%s - type->alloc() failed, err: %d\n",
1771 				__func__, err);
1772 			goto out_free_urb;
1773 		}
1774 	}
1775 
1776 	/* device specific initialisation*/
1777 	if (type->init) {
1778 		err = type->init(usbtouch);
1779 		if (err) {
1780 			dev_dbg(&intf->dev,
1781 				"%s - type->init() failed, err: %d\n",
1782 				__func__, err);
1783 			goto out_do_exit;
1784 		}
1785 	}
1786 
1787 	err = input_register_device(usbtouch->input);
1788 	if (err) {
1789 		dev_dbg(&intf->dev,
1790 			"%s - input_register_device failed, err: %d\n",
1791 			__func__, err);
1792 		goto out_do_exit;
1793 	}
1794 
1795 	usb_set_intfdata(intf, usbtouch);
1796 
1797 	if (usbtouch->type->irq_always) {
1798 		/* this can't fail */
1799 		usb_autopm_get_interface(intf);
1800 		err = usb_submit_urb(usbtouch->irq, GFP_KERNEL);
1801 		if (err) {
1802 			usb_autopm_put_interface(intf);
1803 			dev_err(&intf->dev,
1804 				"%s - usb_submit_urb failed with result: %d\n",
1805 				__func__, err);
1806 			goto out_unregister_input;
1807 		}
1808 	}
1809 
1810 	return 0;
1811 
1812 out_unregister_input:
1813 	input_unregister_device(input_dev);
1814 	input_dev = NULL;
1815 out_do_exit:
1816 	if (type->exit)
1817 		type->exit(usbtouch);
1818 out_free_urb:
1819 	usb_free_urb(usbtouch->irq);
1820 out_free_buffers:
1821 	usbtouch_free_buffers(udev, usbtouch);
1822 out_free:
1823 	input_free_device(input_dev);
1824 	kfree(usbtouch);
1825 	return err;
1826 }
1827 
1828 static void usbtouch_disconnect(struct usb_interface *intf)
1829 {
1830 	struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);
1831 
1832 	if (!usbtouch)
1833 		return;
1834 
1835 	dev_dbg(&intf->dev,
1836 		"%s - usbtouch is initialized, cleaning up\n", __func__);
1837 
1838 	usb_set_intfdata(intf, NULL);
1839 	/* this will stop IO via close */
1840 	input_unregister_device(usbtouch->input);
1841 	usb_free_urb(usbtouch->irq);
1842 	if (usbtouch->type->exit)
1843 		usbtouch->type->exit(usbtouch);
1844 	usbtouch_free_buffers(interface_to_usbdev(intf), usbtouch);
1845 	kfree(usbtouch);
1846 }
1847 
1848 MODULE_DEVICE_TABLE(usb, usbtouch_devices);
1849 
1850 static struct usb_driver usbtouch_driver = {
1851 	.name		= "usbtouchscreen",
1852 	.probe		= usbtouch_probe,
1853 	.disconnect	= usbtouch_disconnect,
1854 	.suspend	= usbtouch_suspend,
1855 	.resume		= usbtouch_resume,
1856 	.reset_resume	= usbtouch_reset_resume,
1857 	.id_table	= usbtouch_devices,
1858 	.supports_autosuspend = 1,
1859 };
1860 
1861 module_usb_driver(usbtouch_driver);
1862 
1863 MODULE_AUTHOR("Daniel Ritz <daniel.ritz@gmx.ch>");
1864 MODULE_DESCRIPTION("USB Touchscreen Driver");
1865 MODULE_LICENSE("GPL");
1866 
1867 MODULE_ALIAS("touchkitusb");
1868 MODULE_ALIAS("itmtouch");
1869 MODULE_ALIAS("mtouchusb");
1870