1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /******************************************************************************
3  * usbtouchscreen.c
4  * Driver for USB Touchscreens, supporting those devices:
5  *  - eGalax Touchkit
6  *    includes eTurboTouch CT-410/510/700
7  *  - 3M/Microtouch  EX II series
8  *  - ITM
9  *  - PanJit TouchSet
10  *  - eTurboTouch
11  *  - Gunze AHL61
12  *  - DMC TSC-10/25
13  *  - IRTOUCHSYSTEMS/UNITOP
14  *  - IdealTEK URTC1000
15  *  - General Touch
16  *  - GoTop Super_Q2/GogoPen/PenPower tablets
17  *  - JASTEC USB touch controller/DigiTech DTR-02U
18  *  - Zytronic capacitive touchscreen
19  *  - NEXIO/iNexio
20  *  - Elo TouchSystems 2700 IntelliTouch
21  *  - EasyTouch USB Dual/Multi touch controller from Data Modul
22  *
23  * Copyright (C) 2004-2007 by Daniel Ritz <daniel.ritz@gmx.ch>
24  * Copyright (C) by Todd E. Johnson (mtouchusb.c)
25  *
26  * Driver is based on touchkitusb.c
27  * - ITM parts are from itmtouch.c
28  * - 3M parts are from mtouchusb.c
29  * - PanJit parts are from an unmerged driver by Lanslott Gish
30  * - DMC TSC 10/25 are from Holger Schurig, with ideas from an unmerged
31  *   driver from Marius Vollmer
32  *
33  *****************************************************************************/
34 
35 //#define DEBUG
36 
37 #include <linux/kernel.h>
38 #include <linux/slab.h>
39 #include <linux/input.h>
40 #include <linux/module.h>
41 #include <linux/usb.h>
42 #include <linux/usb/input.h>
43 #include <linux/hid.h>
44 #include <linux/mutex.h>
45 
46 static bool swap_xy;
47 module_param(swap_xy, bool, 0644);
48 MODULE_PARM_DESC(swap_xy, "If set X and Y axes are swapped.");
49 
50 static bool hwcalib_xy;
51 module_param(hwcalib_xy, bool, 0644);
52 MODULE_PARM_DESC(hwcalib_xy, "If set hw-calibrated X/Y are used if available");
53 
54 /* device specifc data/functions */
55 struct usbtouch_usb;
56 struct usbtouch_device_info {
57 	int min_xc, max_xc;
58 	int min_yc, max_yc;
59 	int min_press, max_press;
60 	int rept_size;
61 
62 	/*
63 	 * Always service the USB devices irq not just when the input device is
64 	 * open. This is useful when devices have a watchdog which prevents us
65 	 * from periodically polling the device. Leave this unset unless your
66 	 * touchscreen device requires it, as it does consume more of the USB
67 	 * bandwidth.
68 	 */
69 	bool irq_always;
70 
71 	void (*process_pkt) (struct usbtouch_usb *usbtouch, unsigned char *pkt, int len);
72 
73 	/*
74 	 * used to get the packet len. possible return values:
75 	 * > 0: packet len
76 	 * = 0: skip one byte
77 	 * < 0: -return value more bytes needed
78 	 */
79 	int  (*get_pkt_len) (unsigned char *pkt, int len);
80 
81 	int  (*read_data)   (struct usbtouch_usb *usbtouch, unsigned char *pkt);
82 	int  (*alloc)       (struct usbtouch_usb *usbtouch);
83 	int  (*init)        (struct usbtouch_usb *usbtouch);
84 	void (*exit)	    (struct usbtouch_usb *usbtouch);
85 };
86 
87 /* a usbtouch device */
88 struct usbtouch_usb {
89 	unsigned char *data;
90 	dma_addr_t data_dma;
91 	int data_size;
92 	unsigned char *buffer;
93 	int buf_len;
94 	struct urb *irq;
95 	struct usb_interface *interface;
96 	struct input_dev *input;
97 	struct usbtouch_device_info *type;
98 	struct mutex pm_mutex;  /* serialize access to open/suspend */
99 	bool is_open;
100 	char name[128];
101 	char phys[64];
102 	void *priv;
103 
104 	int x, y;
105 	int touch, press;
106 };
107 
108 
109 /* device types */
110 enum {
111 	DEVTYPE_IGNORE = -1,
112 	DEVTYPE_EGALAX,
113 	DEVTYPE_PANJIT,
114 	DEVTYPE_3M,
115 	DEVTYPE_ITM,
116 	DEVTYPE_ETURBO,
117 	DEVTYPE_GUNZE,
118 	DEVTYPE_DMC_TSC10,
119 	DEVTYPE_IRTOUCH,
120 	DEVTYPE_IRTOUCH_HIRES,
121 	DEVTYPE_IDEALTEK,
122 	DEVTYPE_GENERAL_TOUCH,
123 	DEVTYPE_GOTOP,
124 	DEVTYPE_JASTEC,
125 	DEVTYPE_E2I,
126 	DEVTYPE_ZYTRONIC,
127 	DEVTYPE_TC45USB,
128 	DEVTYPE_NEXIO,
129 	DEVTYPE_ELO,
130 	DEVTYPE_ETOUCH,
131 };
132 
133 #define USB_DEVICE_HID_CLASS(vend, prod) \
134 	.match_flags = USB_DEVICE_ID_MATCH_INT_CLASS \
135 		| USB_DEVICE_ID_MATCH_DEVICE, \
136 	.idVendor = (vend), \
137 	.idProduct = (prod), \
138 	.bInterfaceClass = USB_INTERFACE_CLASS_HID
139 
140 static const struct usb_device_id usbtouch_devices[] = {
141 #ifdef CONFIG_TOUCHSCREEN_USB_EGALAX
142 	/* ignore the HID capable devices, handled by usbhid */
143 	{USB_DEVICE_HID_CLASS(0x0eef, 0x0001), .driver_info = DEVTYPE_IGNORE},
144 	{USB_DEVICE_HID_CLASS(0x0eef, 0x0002), .driver_info = DEVTYPE_IGNORE},
145 
146 	/* normal device IDs */
147 	{USB_DEVICE(0x3823, 0x0001), .driver_info = DEVTYPE_EGALAX},
148 	{USB_DEVICE(0x3823, 0x0002), .driver_info = DEVTYPE_EGALAX},
149 	{USB_DEVICE(0x0123, 0x0001), .driver_info = DEVTYPE_EGALAX},
150 	{USB_DEVICE(0x0eef, 0x0001), .driver_info = DEVTYPE_EGALAX},
151 	{USB_DEVICE(0x0eef, 0x0002), .driver_info = DEVTYPE_EGALAX},
152 	{USB_DEVICE(0x1234, 0x0001), .driver_info = DEVTYPE_EGALAX},
153 	{USB_DEVICE(0x1234, 0x0002), .driver_info = DEVTYPE_EGALAX},
154 #endif
155 
156 #ifdef CONFIG_TOUCHSCREEN_USB_PANJIT
157 	{USB_DEVICE(0x134c, 0x0001), .driver_info = DEVTYPE_PANJIT},
158 	{USB_DEVICE(0x134c, 0x0002), .driver_info = DEVTYPE_PANJIT},
159 	{USB_DEVICE(0x134c, 0x0003), .driver_info = DEVTYPE_PANJIT},
160 	{USB_DEVICE(0x134c, 0x0004), .driver_info = DEVTYPE_PANJIT},
161 #endif
162 
163 #ifdef CONFIG_TOUCHSCREEN_USB_3M
164 	{USB_DEVICE(0x0596, 0x0001), .driver_info = DEVTYPE_3M},
165 #endif
166 
167 #ifdef CONFIG_TOUCHSCREEN_USB_ITM
168 	{USB_DEVICE(0x0403, 0xf9e9), .driver_info = DEVTYPE_ITM},
169 	{USB_DEVICE(0x16e3, 0xf9e9), .driver_info = DEVTYPE_ITM},
170 #endif
171 
172 #ifdef CONFIG_TOUCHSCREEN_USB_ETURBO
173 	{USB_DEVICE(0x1234, 0x5678), .driver_info = DEVTYPE_ETURBO},
174 #endif
175 
176 #ifdef CONFIG_TOUCHSCREEN_USB_GUNZE
177 	{USB_DEVICE(0x0637, 0x0001), .driver_info = DEVTYPE_GUNZE},
178 #endif
179 
180 #ifdef CONFIG_TOUCHSCREEN_USB_DMC_TSC10
181 	{USB_DEVICE(0x0afa, 0x03e8), .driver_info = DEVTYPE_DMC_TSC10},
182 #endif
183 
184 #ifdef CONFIG_TOUCHSCREEN_USB_IRTOUCH
185 	{USB_DEVICE(0x255e, 0x0001), .driver_info = DEVTYPE_IRTOUCH},
186 	{USB_DEVICE(0x595a, 0x0001), .driver_info = DEVTYPE_IRTOUCH},
187 	{USB_DEVICE(0x6615, 0x0001), .driver_info = DEVTYPE_IRTOUCH},
188 	{USB_DEVICE(0x6615, 0x0012), .driver_info = DEVTYPE_IRTOUCH_HIRES},
189 #endif
190 
191 #ifdef CONFIG_TOUCHSCREEN_USB_IDEALTEK
192 	{USB_DEVICE(0x1391, 0x1000), .driver_info = DEVTYPE_IDEALTEK},
193 #endif
194 
195 #ifdef CONFIG_TOUCHSCREEN_USB_GENERAL_TOUCH
196 	{USB_DEVICE(0x0dfc, 0x0001), .driver_info = DEVTYPE_GENERAL_TOUCH},
197 #endif
198 
199 #ifdef CONFIG_TOUCHSCREEN_USB_GOTOP
200 	{USB_DEVICE(0x08f2, 0x007f), .driver_info = DEVTYPE_GOTOP},
201 	{USB_DEVICE(0x08f2, 0x00ce), .driver_info = DEVTYPE_GOTOP},
202 	{USB_DEVICE(0x08f2, 0x00f4), .driver_info = DEVTYPE_GOTOP},
203 #endif
204 
205 #ifdef CONFIG_TOUCHSCREEN_USB_JASTEC
206 	{USB_DEVICE(0x0f92, 0x0001), .driver_info = DEVTYPE_JASTEC},
207 #endif
208 
209 #ifdef CONFIG_TOUCHSCREEN_USB_E2I
210 	{USB_DEVICE(0x1ac7, 0x0001), .driver_info = DEVTYPE_E2I},
211 #endif
212 
213 #ifdef CONFIG_TOUCHSCREEN_USB_ZYTRONIC
214 	{USB_DEVICE(0x14c8, 0x0003), .driver_info = DEVTYPE_ZYTRONIC},
215 #endif
216 
217 #ifdef CONFIG_TOUCHSCREEN_USB_ETT_TC45USB
218 	/* TC5UH */
219 	{USB_DEVICE(0x0664, 0x0309), .driver_info = DEVTYPE_TC45USB},
220 	/* TC4UM */
221 	{USB_DEVICE(0x0664, 0x0306), .driver_info = DEVTYPE_TC45USB},
222 #endif
223 
224 #ifdef CONFIG_TOUCHSCREEN_USB_NEXIO
225 	/* data interface only */
226 	{USB_DEVICE_AND_INTERFACE_INFO(0x10f0, 0x2002, 0x0a, 0x00, 0x00),
227 		.driver_info = DEVTYPE_NEXIO},
228 	{USB_DEVICE_AND_INTERFACE_INFO(0x1870, 0x0001, 0x0a, 0x00, 0x00),
229 		.driver_info = DEVTYPE_NEXIO},
230 #endif
231 
232 #ifdef CONFIG_TOUCHSCREEN_USB_ELO
233 	{USB_DEVICE(0x04e7, 0x0020), .driver_info = DEVTYPE_ELO},
234 #endif
235 
236 #ifdef CONFIG_TOUCHSCREEN_USB_EASYTOUCH
237 	{USB_DEVICE(0x7374, 0x0001), .driver_info = DEVTYPE_ETOUCH},
238 #endif
239 
240 	{}
241 };
242 
243 
244 /*****************************************************************************
245  * e2i Part
246  */
247 
248 #ifdef CONFIG_TOUCHSCREEN_USB_E2I
249 static int e2i_init(struct usbtouch_usb *usbtouch)
250 {
251 	int ret;
252 	struct usb_device *udev = interface_to_usbdev(usbtouch->interface);
253 
254 	ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
255 	                      0x01, 0x02, 0x0000, 0x0081,
256 	                      NULL, 0, USB_CTRL_SET_TIMEOUT);
257 
258 	dev_dbg(&usbtouch->interface->dev,
259 		"%s - usb_control_msg - E2I_RESET - bytes|err: %d\n",
260 		__func__, ret);
261 	return ret;
262 }
263 
264 static int e2i_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
265 {
266 	int tmp = (pkt[0] << 8) | pkt[1];
267 	dev->x  = (pkt[2] << 8) | pkt[3];
268 	dev->y  = (pkt[4] << 8) | pkt[5];
269 
270 	tmp = tmp - 0xA000;
271 	dev->touch = (tmp > 0);
272 	dev->press = (tmp > 0 ? tmp : 0);
273 
274 	return 1;
275 }
276 #endif
277 
278 
279 /*****************************************************************************
280  * eGalax part
281  */
282 
283 #ifdef CONFIG_TOUCHSCREEN_USB_EGALAX
284 
285 #ifndef MULTI_PACKET
286 #define MULTI_PACKET
287 #endif
288 
289 #define EGALAX_PKT_TYPE_MASK		0xFE
290 #define EGALAX_PKT_TYPE_REPT		0x80
291 #define EGALAX_PKT_TYPE_DIAG		0x0A
292 
293 static int egalax_init(struct usbtouch_usb *usbtouch)
294 {
295 	int ret, i;
296 	unsigned char *buf;
297 	struct usb_device *udev = interface_to_usbdev(usbtouch->interface);
298 
299 	/*
300 	 * An eGalax diagnostic packet kicks the device into using the right
301 	 * protocol.  We send a "check active" packet.  The response will be
302 	 * read later and ignored.
303 	 */
304 
305 	buf = kmalloc(3, GFP_KERNEL);
306 	if (!buf)
307 		return -ENOMEM;
308 
309 	buf[0] = EGALAX_PKT_TYPE_DIAG;
310 	buf[1] = 1;	/* length */
311 	buf[2] = 'A';	/* command - check active */
312 
313 	for (i = 0; i < 3; i++) {
314 		ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
315 				      0,
316 				      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
317 				      0, 0, buf, 3,
318 				      USB_CTRL_SET_TIMEOUT);
319 		if (ret >= 0) {
320 			ret = 0;
321 			break;
322 		}
323 		if (ret != -EPIPE)
324 			break;
325 	}
326 
327 	kfree(buf);
328 
329 	return ret;
330 }
331 
332 static int egalax_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
333 {
334 	if ((pkt[0] & EGALAX_PKT_TYPE_MASK) != EGALAX_PKT_TYPE_REPT)
335 		return 0;
336 
337 	dev->x = ((pkt[3] & 0x0F) << 7) | (pkt[4] & 0x7F);
338 	dev->y = ((pkt[1] & 0x0F) << 7) | (pkt[2] & 0x7F);
339 	dev->touch = pkt[0] & 0x01;
340 
341 	return 1;
342 }
343 
344 static int egalax_get_pkt_len(unsigned char *buf, int len)
345 {
346 	switch (buf[0] & EGALAX_PKT_TYPE_MASK) {
347 	case EGALAX_PKT_TYPE_REPT:
348 		return 5;
349 
350 	case EGALAX_PKT_TYPE_DIAG:
351 		if (len < 2)
352 			return -1;
353 
354 		return buf[1] + 2;
355 	}
356 
357 	return 0;
358 }
359 #endif
360 
361 /*****************************************************************************
362  * EasyTouch part
363  */
364 
365 #ifdef CONFIG_TOUCHSCREEN_USB_EASYTOUCH
366 
367 #ifndef MULTI_PACKET
368 #define MULTI_PACKET
369 #endif
370 
371 #define ETOUCH_PKT_TYPE_MASK		0xFE
372 #define ETOUCH_PKT_TYPE_REPT		0x80
373 #define ETOUCH_PKT_TYPE_REPT2		0xB0
374 #define ETOUCH_PKT_TYPE_DIAG		0x0A
375 
376 static int etouch_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
377 {
378 	if ((pkt[0] & ETOUCH_PKT_TYPE_MASK) != ETOUCH_PKT_TYPE_REPT &&
379 		(pkt[0] & ETOUCH_PKT_TYPE_MASK) != ETOUCH_PKT_TYPE_REPT2)
380 		return 0;
381 
382 	dev->x = ((pkt[1] & 0x1F) << 7) | (pkt[2] & 0x7F);
383 	dev->y = ((pkt[3] & 0x1F) << 7) | (pkt[4] & 0x7F);
384 	dev->touch = pkt[0] & 0x01;
385 
386 	return 1;
387 }
388 
389 static int etouch_get_pkt_len(unsigned char *buf, int len)
390 {
391 	switch (buf[0] & ETOUCH_PKT_TYPE_MASK) {
392 	case ETOUCH_PKT_TYPE_REPT:
393 	case ETOUCH_PKT_TYPE_REPT2:
394 		return 5;
395 
396 	case ETOUCH_PKT_TYPE_DIAG:
397 		if (len < 2)
398 			return -1;
399 
400 		return buf[1] + 2;
401 	}
402 
403 	return 0;
404 }
405 #endif
406 
407 /*****************************************************************************
408  * PanJit Part
409  */
410 #ifdef CONFIG_TOUCHSCREEN_USB_PANJIT
411 static int panjit_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
412 {
413 	dev->x = ((pkt[2] & 0x0F) << 8) | pkt[1];
414 	dev->y = ((pkt[4] & 0x0F) << 8) | pkt[3];
415 	dev->touch = pkt[0] & 0x01;
416 
417 	return 1;
418 }
419 #endif
420 
421 
422 /*****************************************************************************
423  * 3M/Microtouch Part
424  */
425 #ifdef CONFIG_TOUCHSCREEN_USB_3M
426 
427 #define MTOUCHUSB_ASYNC_REPORT          1
428 #define MTOUCHUSB_RESET                 7
429 #define MTOUCHUSB_REQ_CTRLLR_ID         10
430 
431 #define MTOUCHUSB_REQ_CTRLLR_ID_LEN	16
432 
433 static int mtouch_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
434 {
435 	if (hwcalib_xy) {
436 		dev->x = (pkt[4] << 8) | pkt[3];
437 		dev->y = 0xffff - ((pkt[6] << 8) | pkt[5]);
438 	} else {
439 		dev->x = (pkt[8] << 8) | pkt[7];
440 		dev->y = (pkt[10] << 8) | pkt[9];
441 	}
442 	dev->touch = (pkt[2] & 0x40) ? 1 : 0;
443 
444 	return 1;
445 }
446 
447 struct mtouch_priv {
448 	u8 fw_rev_major;
449 	u8 fw_rev_minor;
450 };
451 
452 static ssize_t mtouch_firmware_rev_show(struct device *dev,
453 				struct device_attribute *attr, char *output)
454 {
455 	struct usb_interface *intf = to_usb_interface(dev);
456 	struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);
457 	struct mtouch_priv *priv = usbtouch->priv;
458 
459 	return scnprintf(output, PAGE_SIZE, "%1x.%1x\n",
460 			 priv->fw_rev_major, priv->fw_rev_minor);
461 }
462 static DEVICE_ATTR(firmware_rev, 0444, mtouch_firmware_rev_show, NULL);
463 
464 static struct attribute *mtouch_attrs[] = {
465 	&dev_attr_firmware_rev.attr,
466 	NULL
467 };
468 
469 static const struct attribute_group mtouch_attr_group = {
470 	.attrs = mtouch_attrs,
471 };
472 
473 static int mtouch_get_fw_revision(struct usbtouch_usb *usbtouch)
474 {
475 	struct usb_device *udev = interface_to_usbdev(usbtouch->interface);
476 	struct mtouch_priv *priv = usbtouch->priv;
477 	u8 *buf;
478 	int ret;
479 
480 	buf = kzalloc(MTOUCHUSB_REQ_CTRLLR_ID_LEN, GFP_NOIO);
481 	if (!buf)
482 		return -ENOMEM;
483 
484 	ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
485 			      MTOUCHUSB_REQ_CTRLLR_ID,
486 			      USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
487 			      0, 0, buf, MTOUCHUSB_REQ_CTRLLR_ID_LEN,
488 			      USB_CTRL_SET_TIMEOUT);
489 	if (ret != MTOUCHUSB_REQ_CTRLLR_ID_LEN) {
490 		dev_warn(&usbtouch->interface->dev,
491 			 "Failed to read FW rev: %d\n", ret);
492 		ret = ret < 0 ? ret : -EIO;
493 		goto free;
494 	}
495 
496 	priv->fw_rev_major = buf[3];
497 	priv->fw_rev_minor = buf[4];
498 
499 	ret = 0;
500 
501 free:
502 	kfree(buf);
503 	return ret;
504 }
505 
506 static int mtouch_alloc(struct usbtouch_usb *usbtouch)
507 {
508 	int ret;
509 
510 	usbtouch->priv = kmalloc(sizeof(struct mtouch_priv), GFP_KERNEL);
511 	if (!usbtouch->priv)
512 		return -ENOMEM;
513 
514 	ret = sysfs_create_group(&usbtouch->interface->dev.kobj,
515 				 &mtouch_attr_group);
516 	if (ret) {
517 		kfree(usbtouch->priv);
518 		usbtouch->priv = NULL;
519 		return ret;
520 	}
521 
522 	return 0;
523 }
524 
525 static int mtouch_init(struct usbtouch_usb *usbtouch)
526 {
527 	int ret, i;
528 	struct usb_device *udev = interface_to_usbdev(usbtouch->interface);
529 
530 	ret = mtouch_get_fw_revision(usbtouch);
531 	if (ret)
532 		return ret;
533 
534 	ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
535 	                      MTOUCHUSB_RESET,
536 	                      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
537 	                      1, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
538 	dev_dbg(&usbtouch->interface->dev,
539 		"%s - usb_control_msg - MTOUCHUSB_RESET - bytes|err: %d\n",
540 		__func__, ret);
541 	if (ret < 0)
542 		return ret;
543 	msleep(150);
544 
545 	for (i = 0; i < 3; i++) {
546 		ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
547 				      MTOUCHUSB_ASYNC_REPORT,
548 				      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
549 				      1, 1, NULL, 0, USB_CTRL_SET_TIMEOUT);
550 		dev_dbg(&usbtouch->interface->dev,
551 			"%s - usb_control_msg - MTOUCHUSB_ASYNC_REPORT - bytes|err: %d\n",
552 			__func__, ret);
553 		if (ret >= 0)
554 			break;
555 		if (ret != -EPIPE)
556 			return ret;
557 	}
558 
559 	/* Default min/max xy are the raw values, override if using hw-calib */
560 	if (hwcalib_xy) {
561 		input_set_abs_params(usbtouch->input, ABS_X, 0, 0xffff, 0, 0);
562 		input_set_abs_params(usbtouch->input, ABS_Y, 0, 0xffff, 0, 0);
563 	}
564 
565 	return 0;
566 }
567 
568 static void mtouch_exit(struct usbtouch_usb *usbtouch)
569 {
570 	struct mtouch_priv *priv = usbtouch->priv;
571 
572 	sysfs_remove_group(&usbtouch->interface->dev.kobj, &mtouch_attr_group);
573 	kfree(priv);
574 }
575 #endif
576 
577 
578 /*****************************************************************************
579  * ITM Part
580  */
581 #ifdef CONFIG_TOUCHSCREEN_USB_ITM
582 static int itm_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
583 {
584 	int touch;
585 	/*
586 	 * ITM devices report invalid x/y data if not touched.
587 	 * if the screen was touched before but is not touched any more
588 	 * report touch as 0 with the last valid x/y data once. then stop
589 	 * reporting data until touched again.
590 	 */
591 	dev->press = ((pkt[2] & 0x01) << 7) | (pkt[5] & 0x7F);
592 
593 	touch = ~pkt[7] & 0x20;
594 	if (!touch) {
595 		if (dev->touch) {
596 			dev->touch = 0;
597 			return 1;
598 		}
599 
600 		return 0;
601 	}
602 
603 	dev->x = ((pkt[0] & 0x1F) << 7) | (pkt[3] & 0x7F);
604 	dev->y = ((pkt[1] & 0x1F) << 7) | (pkt[4] & 0x7F);
605 	dev->touch = touch;
606 
607 	return 1;
608 }
609 #endif
610 
611 
612 /*****************************************************************************
613  * eTurboTouch part
614  */
615 #ifdef CONFIG_TOUCHSCREEN_USB_ETURBO
616 #ifndef MULTI_PACKET
617 #define MULTI_PACKET
618 #endif
619 static int eturbo_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
620 {
621 	unsigned int shift;
622 
623 	/* packets should start with sync */
624 	if (!(pkt[0] & 0x80))
625 		return 0;
626 
627 	shift = (6 - (pkt[0] & 0x03));
628 	dev->x = ((pkt[3] << 7) | pkt[4]) >> shift;
629 	dev->y = ((pkt[1] << 7) | pkt[2]) >> shift;
630 	dev->touch = (pkt[0] & 0x10) ? 1 : 0;
631 
632 	return 1;
633 }
634 
635 static int eturbo_get_pkt_len(unsigned char *buf, int len)
636 {
637 	if (buf[0] & 0x80)
638 		return 5;
639 	if (buf[0] == 0x01)
640 		return 3;
641 	return 0;
642 }
643 #endif
644 
645 
646 /*****************************************************************************
647  * Gunze part
648  */
649 #ifdef CONFIG_TOUCHSCREEN_USB_GUNZE
650 static int gunze_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
651 {
652 	if (!(pkt[0] & 0x80) || ((pkt[1] | pkt[2] | pkt[3]) & 0x80))
653 		return 0;
654 
655 	dev->x = ((pkt[0] & 0x1F) << 7) | (pkt[2] & 0x7F);
656 	dev->y = ((pkt[1] & 0x1F) << 7) | (pkt[3] & 0x7F);
657 	dev->touch = pkt[0] & 0x20;
658 
659 	return 1;
660 }
661 #endif
662 
663 /*****************************************************************************
664  * DMC TSC-10/25 Part
665  *
666  * Documentation about the controller and it's protocol can be found at
667  *   http://www.dmccoltd.com/files/controler/tsc10usb_pi_e.pdf
668  *   http://www.dmccoltd.com/files/controler/tsc25_usb_e.pdf
669  */
670 #ifdef CONFIG_TOUCHSCREEN_USB_DMC_TSC10
671 
672 /* supported data rates. currently using 130 */
673 #define TSC10_RATE_POINT	0x50
674 #define TSC10_RATE_30		0x40
675 #define TSC10_RATE_50		0x41
676 #define TSC10_RATE_80		0x42
677 #define TSC10_RATE_100		0x43
678 #define TSC10_RATE_130		0x44
679 #define TSC10_RATE_150		0x45
680 
681 /* commands */
682 #define TSC10_CMD_RESET		0x55
683 #define TSC10_CMD_RATE		0x05
684 #define TSC10_CMD_DATA1		0x01
685 
686 static int dmc_tsc10_init(struct usbtouch_usb *usbtouch)
687 {
688 	struct usb_device *dev = interface_to_usbdev(usbtouch->interface);
689 	int ret = -ENOMEM;
690 	unsigned char *buf;
691 
692 	buf = kmalloc(2, GFP_NOIO);
693 	if (!buf)
694 		goto err_nobuf;
695 	/* reset */
696 	buf[0] = buf[1] = 0xFF;
697 	ret = usb_control_msg(dev, usb_rcvctrlpipe (dev, 0),
698 	                      TSC10_CMD_RESET,
699 	                      USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
700 	                      0, 0, buf, 2, USB_CTRL_SET_TIMEOUT);
701 	if (ret < 0)
702 		goto err_out;
703 	if (buf[0] != 0x06) {
704 		ret = -ENODEV;
705 		goto err_out;
706 	}
707 
708 	/* TSC-25 data sheet specifies a delay after the RESET command */
709 	msleep(150);
710 
711 	/* set coordinate output rate */
712 	buf[0] = buf[1] = 0xFF;
713 	ret = usb_control_msg(dev, usb_rcvctrlpipe (dev, 0),
714 	                      TSC10_CMD_RATE,
715 	                      USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
716 	                      TSC10_RATE_150, 0, buf, 2, USB_CTRL_SET_TIMEOUT);
717 	if (ret < 0)
718 		goto err_out;
719 	if ((buf[0] != 0x06) && (buf[0] != 0x15 || buf[1] != 0x01)) {
720 		ret = -ENODEV;
721 		goto err_out;
722 	}
723 
724 	/* start sending data */
725 	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
726 	                      TSC10_CMD_DATA1,
727 	                      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
728 	                      0, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
729 err_out:
730 	kfree(buf);
731 err_nobuf:
732 	return ret;
733 }
734 
735 
736 static int dmc_tsc10_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
737 {
738 	dev->x = ((pkt[2] & 0x03) << 8) | pkt[1];
739 	dev->y = ((pkt[4] & 0x03) << 8) | pkt[3];
740 	dev->touch = pkt[0] & 0x01;
741 
742 	return 1;
743 }
744 #endif
745 
746 
747 /*****************************************************************************
748  * IRTOUCH Part
749  */
750 #ifdef CONFIG_TOUCHSCREEN_USB_IRTOUCH
751 static int irtouch_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
752 {
753 	dev->x = (pkt[3] << 8) | pkt[2];
754 	dev->y = (pkt[5] << 8) | pkt[4];
755 	dev->touch = (pkt[1] & 0x03) ? 1 : 0;
756 
757 	return 1;
758 }
759 #endif
760 
761 /*****************************************************************************
762  * ET&T TC5UH/TC4UM part
763  */
764 #ifdef CONFIG_TOUCHSCREEN_USB_ETT_TC45USB
765 static int tc45usb_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
766 {
767 	dev->x = ((pkt[2] & 0x0F) << 8) | pkt[1];
768 	dev->y = ((pkt[4] & 0x0F) << 8) | pkt[3];
769 	dev->touch = pkt[0] & 0x01;
770 
771 	return 1;
772 }
773 #endif
774 
775 /*****************************************************************************
776  * IdealTEK URTC1000 Part
777  */
778 #ifdef CONFIG_TOUCHSCREEN_USB_IDEALTEK
779 #ifndef MULTI_PACKET
780 #define MULTI_PACKET
781 #endif
782 static int idealtek_get_pkt_len(unsigned char *buf, int len)
783 {
784 	if (buf[0] & 0x80)
785 		return 5;
786 	if (buf[0] == 0x01)
787 		return len;
788 	return 0;
789 }
790 
791 static int idealtek_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
792 {
793 	switch (pkt[0] & 0x98) {
794 	case 0x88:
795 		/* touch data in IdealTEK mode */
796 		dev->x = (pkt[1] << 5) | (pkt[2] >> 2);
797 		dev->y = (pkt[3] << 5) | (pkt[4] >> 2);
798 		dev->touch = (pkt[0] & 0x40) ? 1 : 0;
799 		return 1;
800 
801 	case 0x98:
802 		/* touch data in MT emulation mode */
803 		dev->x = (pkt[2] << 5) | (pkt[1] >> 2);
804 		dev->y = (pkt[4] << 5) | (pkt[3] >> 2);
805 		dev->touch = (pkt[0] & 0x40) ? 1 : 0;
806 		return 1;
807 
808 	default:
809 		return 0;
810 	}
811 }
812 #endif
813 
814 /*****************************************************************************
815  * General Touch Part
816  */
817 #ifdef CONFIG_TOUCHSCREEN_USB_GENERAL_TOUCH
818 static int general_touch_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
819 {
820 	dev->x = (pkt[2] << 8) | pkt[1];
821 	dev->y = (pkt[4] << 8) | pkt[3];
822 	dev->press = pkt[5] & 0xff;
823 	dev->touch = pkt[0] & 0x01;
824 
825 	return 1;
826 }
827 #endif
828 
829 /*****************************************************************************
830  * GoTop Part
831  */
832 #ifdef CONFIG_TOUCHSCREEN_USB_GOTOP
833 static int gotop_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
834 {
835 	dev->x = ((pkt[1] & 0x38) << 4) | pkt[2];
836 	dev->y = ((pkt[1] & 0x07) << 7) | pkt[3];
837 	dev->touch = pkt[0] & 0x01;
838 
839 	return 1;
840 }
841 #endif
842 
843 /*****************************************************************************
844  * JASTEC Part
845  */
846 #ifdef CONFIG_TOUCHSCREEN_USB_JASTEC
847 static int jastec_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
848 {
849 	dev->x = ((pkt[0] & 0x3f) << 6) | (pkt[2] & 0x3f);
850 	dev->y = ((pkt[1] & 0x3f) << 6) | (pkt[3] & 0x3f);
851 	dev->touch = (pkt[0] & 0x40) >> 6;
852 
853 	return 1;
854 }
855 #endif
856 
857 /*****************************************************************************
858  * Zytronic Part
859  */
860 #ifdef CONFIG_TOUCHSCREEN_USB_ZYTRONIC
861 static int zytronic_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
862 {
863 	struct usb_interface *intf = dev->interface;
864 
865 	switch (pkt[0]) {
866 	case 0x3A: /* command response */
867 		dev_dbg(&intf->dev, "%s: Command response %d\n", __func__, pkt[1]);
868 		break;
869 
870 	case 0xC0: /* down */
871 		dev->x = (pkt[1] & 0x7f) | ((pkt[2] & 0x07) << 7);
872 		dev->y = (pkt[3] & 0x7f) | ((pkt[4] & 0x07) << 7);
873 		dev->touch = 1;
874 		dev_dbg(&intf->dev, "%s: down %d,%d\n", __func__, dev->x, dev->y);
875 		return 1;
876 
877 	case 0x80: /* up */
878 		dev->x = (pkt[1] & 0x7f) | ((pkt[2] & 0x07) << 7);
879 		dev->y = (pkt[3] & 0x7f) | ((pkt[4] & 0x07) << 7);
880 		dev->touch = 0;
881 		dev_dbg(&intf->dev, "%s: up %d,%d\n", __func__, dev->x, dev->y);
882 		return 1;
883 
884 	default:
885 		dev_dbg(&intf->dev, "%s: Unknown return %d\n", __func__, pkt[0]);
886 		break;
887 	}
888 
889 	return 0;
890 }
891 #endif
892 
893 /*****************************************************************************
894  * NEXIO Part
895  */
896 #ifdef CONFIG_TOUCHSCREEN_USB_NEXIO
897 
898 #define NEXIO_TIMEOUT	5000
899 #define NEXIO_BUFSIZE	1024
900 #define NEXIO_THRESHOLD	50
901 
902 struct nexio_priv {
903 	struct urb *ack;
904 	unsigned char *ack_buf;
905 };
906 
907 struct nexio_touch_packet {
908 	u8	flags;		/* 0xe1 = touch, 0xe1 = release */
909 	__be16	data_len;	/* total bytes of touch data */
910 	__be16	x_len;		/* bytes for X axis */
911 	__be16	y_len;		/* bytes for Y axis */
912 	u8	data[];
913 } __attribute__ ((packed));
914 
915 static unsigned char nexio_ack_pkt[2] = { 0xaa, 0x02 };
916 static unsigned char nexio_init_pkt[4] = { 0x82, 0x04, 0x0a, 0x0f };
917 
918 static void nexio_ack_complete(struct urb *urb)
919 {
920 }
921 
922 static int nexio_alloc(struct usbtouch_usb *usbtouch)
923 {
924 	struct nexio_priv *priv;
925 	int ret = -ENOMEM;
926 
927 	usbtouch->priv = kmalloc(sizeof(struct nexio_priv), GFP_KERNEL);
928 	if (!usbtouch->priv)
929 		goto out_buf;
930 
931 	priv = usbtouch->priv;
932 
933 	priv->ack_buf = kmemdup(nexio_ack_pkt, sizeof(nexio_ack_pkt),
934 				GFP_KERNEL);
935 	if (!priv->ack_buf)
936 		goto err_priv;
937 
938 	priv->ack = usb_alloc_urb(0, GFP_KERNEL);
939 	if (!priv->ack) {
940 		dev_dbg(&usbtouch->interface->dev,
941 			"%s - usb_alloc_urb failed: usbtouch->ack\n", __func__);
942 		goto err_ack_buf;
943 	}
944 
945 	return 0;
946 
947 err_ack_buf:
948 	kfree(priv->ack_buf);
949 err_priv:
950 	kfree(priv);
951 out_buf:
952 	return ret;
953 }
954 
955 static int nexio_init(struct usbtouch_usb *usbtouch)
956 {
957 	struct usb_device *dev = interface_to_usbdev(usbtouch->interface);
958 	struct usb_host_interface *interface = usbtouch->interface->cur_altsetting;
959 	struct nexio_priv *priv = usbtouch->priv;
960 	int ret = -ENOMEM;
961 	int actual_len, i;
962 	unsigned char *buf;
963 	char *firmware_ver = NULL, *device_name = NULL;
964 	int input_ep = 0, output_ep = 0;
965 
966 	/* find first input and output endpoint */
967 	for (i = 0; i < interface->desc.bNumEndpoints; i++) {
968 		if (!input_ep &&
969 		    usb_endpoint_dir_in(&interface->endpoint[i].desc))
970 			input_ep = interface->endpoint[i].desc.bEndpointAddress;
971 		if (!output_ep &&
972 		    usb_endpoint_dir_out(&interface->endpoint[i].desc))
973 			output_ep = interface->endpoint[i].desc.bEndpointAddress;
974 	}
975 	if (!input_ep || !output_ep)
976 		return -ENXIO;
977 
978 	buf = kmalloc(NEXIO_BUFSIZE, GFP_NOIO);
979 	if (!buf)
980 		goto out_buf;
981 
982 	/* two empty reads */
983 	for (i = 0; i < 2; i++) {
984 		ret = usb_bulk_msg(dev, usb_rcvbulkpipe(dev, input_ep),
985 				   buf, NEXIO_BUFSIZE, &actual_len,
986 				   NEXIO_TIMEOUT);
987 		if (ret < 0)
988 			goto out_buf;
989 	}
990 
991 	/* send init command */
992 	memcpy(buf, nexio_init_pkt, sizeof(nexio_init_pkt));
993 	ret = usb_bulk_msg(dev, usb_sndbulkpipe(dev, output_ep),
994 			   buf, sizeof(nexio_init_pkt), &actual_len,
995 			   NEXIO_TIMEOUT);
996 	if (ret < 0)
997 		goto out_buf;
998 
999 	/* read replies */
1000 	for (i = 0; i < 3; i++) {
1001 		memset(buf, 0, NEXIO_BUFSIZE);
1002 		ret = usb_bulk_msg(dev, usb_rcvbulkpipe(dev, input_ep),
1003 				   buf, NEXIO_BUFSIZE, &actual_len,
1004 				   NEXIO_TIMEOUT);
1005 		if (ret < 0 || actual_len < 1 || buf[1] != actual_len)
1006 			continue;
1007 		switch (buf[0]) {
1008 		case 0x83:	/* firmware version */
1009 			if (!firmware_ver)
1010 				firmware_ver = kstrdup(&buf[2], GFP_NOIO);
1011 			break;
1012 		case 0x84:	/* device name */
1013 			if (!device_name)
1014 				device_name = kstrdup(&buf[2], GFP_NOIO);
1015 			break;
1016 		}
1017 	}
1018 
1019 	printk(KERN_INFO "Nexio device: %s, firmware version: %s\n",
1020 	       device_name, firmware_ver);
1021 
1022 	kfree(firmware_ver);
1023 	kfree(device_name);
1024 
1025 	usb_fill_bulk_urb(priv->ack, dev, usb_sndbulkpipe(dev, output_ep),
1026 			  priv->ack_buf, sizeof(nexio_ack_pkt),
1027 			  nexio_ack_complete, usbtouch);
1028 	ret = 0;
1029 
1030 out_buf:
1031 	kfree(buf);
1032 	return ret;
1033 }
1034 
1035 static void nexio_exit(struct usbtouch_usb *usbtouch)
1036 {
1037 	struct nexio_priv *priv = usbtouch->priv;
1038 
1039 	usb_kill_urb(priv->ack);
1040 	usb_free_urb(priv->ack);
1041 	kfree(priv->ack_buf);
1042 	kfree(priv);
1043 }
1044 
1045 static int nexio_read_data(struct usbtouch_usb *usbtouch, unsigned char *pkt)
1046 {
1047 	struct device *dev = &usbtouch->interface->dev;
1048 	struct nexio_touch_packet *packet = (void *) pkt;
1049 	struct nexio_priv *priv = usbtouch->priv;
1050 	unsigned int data_len = be16_to_cpu(packet->data_len);
1051 	unsigned int x_len = be16_to_cpu(packet->x_len);
1052 	unsigned int y_len = be16_to_cpu(packet->y_len);
1053 	int x, y, begin_x, begin_y, end_x, end_y, w, h, ret;
1054 
1055 	/* got touch data? */
1056 	if ((pkt[0] & 0xe0) != 0xe0)
1057 		return 0;
1058 
1059 	if (data_len > 0xff)
1060 		data_len -= 0x100;
1061 	if (x_len > 0xff)
1062 		x_len -= 0x80;
1063 
1064 	/* send ACK */
1065 	ret = usb_submit_urb(priv->ack, GFP_ATOMIC);
1066 	if (ret)
1067 		dev_warn(dev, "Failed to submit ACK URB: %d\n", ret);
1068 
1069 	if (!usbtouch->type->max_xc) {
1070 		usbtouch->type->max_xc = 2 * x_len;
1071 		input_set_abs_params(usbtouch->input, ABS_X,
1072 				     0, usbtouch->type->max_xc, 0, 0);
1073 		usbtouch->type->max_yc = 2 * y_len;
1074 		input_set_abs_params(usbtouch->input, ABS_Y,
1075 				     0, usbtouch->type->max_yc, 0, 0);
1076 	}
1077 	/*
1078 	 * The device reports state of IR sensors on X and Y axes.
1079 	 * Each byte represents "darkness" percentage (0-100) of one element.
1080 	 * 17" touchscreen reports only 64 x 52 bytes so the resolution is low.
1081 	 * This also means that there's a limited multi-touch capability but
1082 	 * it's disabled (and untested) here as there's no X driver for that.
1083 	 */
1084 	begin_x = end_x = begin_y = end_y = -1;
1085 	for (x = 0; x < x_len; x++) {
1086 		if (begin_x == -1 && packet->data[x] > NEXIO_THRESHOLD) {
1087 			begin_x = x;
1088 			continue;
1089 		}
1090 		if (end_x == -1 && begin_x != -1 && packet->data[x] < NEXIO_THRESHOLD) {
1091 			end_x = x - 1;
1092 			for (y = x_len; y < data_len; y++) {
1093 				if (begin_y == -1 && packet->data[y] > NEXIO_THRESHOLD) {
1094 					begin_y = y - x_len;
1095 					continue;
1096 				}
1097 				if (end_y == -1 &&
1098 				    begin_y != -1 && packet->data[y] < NEXIO_THRESHOLD) {
1099 					end_y = y - 1 - x_len;
1100 					w = end_x - begin_x;
1101 					h = end_y - begin_y;
1102 #if 0
1103 					/* multi-touch */
1104 					input_report_abs(usbtouch->input,
1105 						    ABS_MT_TOUCH_MAJOR, max(w,h));
1106 					input_report_abs(usbtouch->input,
1107 						    ABS_MT_TOUCH_MINOR, min(x,h));
1108 					input_report_abs(usbtouch->input,
1109 						    ABS_MT_POSITION_X, 2*begin_x+w);
1110 					input_report_abs(usbtouch->input,
1111 						    ABS_MT_POSITION_Y, 2*begin_y+h);
1112 					input_report_abs(usbtouch->input,
1113 						    ABS_MT_ORIENTATION, w > h);
1114 					input_mt_sync(usbtouch->input);
1115 #endif
1116 					/* single touch */
1117 					usbtouch->x = 2 * begin_x + w;
1118 					usbtouch->y = 2 * begin_y + h;
1119 					usbtouch->touch = packet->flags & 0x01;
1120 					begin_y = end_y = -1;
1121 					return 1;
1122 				}
1123 			}
1124 			begin_x = end_x = -1;
1125 		}
1126 
1127 	}
1128 	return 0;
1129 }
1130 #endif
1131 
1132 
1133 /*****************************************************************************
1134  * ELO part
1135  */
1136 
1137 #ifdef CONFIG_TOUCHSCREEN_USB_ELO
1138 
1139 static int elo_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
1140 {
1141 	dev->x = (pkt[3] << 8) | pkt[2];
1142 	dev->y = (pkt[5] << 8) | pkt[4];
1143 	dev->touch = pkt[6] > 0;
1144 	dev->press = pkt[6];
1145 
1146 	return 1;
1147 }
1148 #endif
1149 
1150 
1151 /*****************************************************************************
1152  * the different device descriptors
1153  */
1154 #ifdef MULTI_PACKET
1155 static void usbtouch_process_multi(struct usbtouch_usb *usbtouch,
1156 				   unsigned char *pkt, int len);
1157 #endif
1158 
1159 static struct usbtouch_device_info usbtouch_dev_info[] = {
1160 #ifdef CONFIG_TOUCHSCREEN_USB_ELO
1161 	[DEVTYPE_ELO] = {
1162 		.min_xc		= 0x0,
1163 		.max_xc		= 0x0fff,
1164 		.min_yc		= 0x0,
1165 		.max_yc		= 0x0fff,
1166 		.max_press	= 0xff,
1167 		.rept_size	= 8,
1168 		.read_data	= elo_read_data,
1169 	},
1170 #endif
1171 
1172 #ifdef CONFIG_TOUCHSCREEN_USB_EGALAX
1173 	[DEVTYPE_EGALAX] = {
1174 		.min_xc		= 0x0,
1175 		.max_xc		= 0x07ff,
1176 		.min_yc		= 0x0,
1177 		.max_yc		= 0x07ff,
1178 		.rept_size	= 16,
1179 		.process_pkt	= usbtouch_process_multi,
1180 		.get_pkt_len	= egalax_get_pkt_len,
1181 		.read_data	= egalax_read_data,
1182 		.init		= egalax_init,
1183 	},
1184 #endif
1185 
1186 #ifdef CONFIG_TOUCHSCREEN_USB_PANJIT
1187 	[DEVTYPE_PANJIT] = {
1188 		.min_xc		= 0x0,
1189 		.max_xc		= 0x0fff,
1190 		.min_yc		= 0x0,
1191 		.max_yc		= 0x0fff,
1192 		.rept_size	= 8,
1193 		.read_data	= panjit_read_data,
1194 	},
1195 #endif
1196 
1197 #ifdef CONFIG_TOUCHSCREEN_USB_3M
1198 	[DEVTYPE_3M] = {
1199 		.min_xc		= 0x0,
1200 		.max_xc		= 0x4000,
1201 		.min_yc		= 0x0,
1202 		.max_yc		= 0x4000,
1203 		.rept_size	= 11,
1204 		.read_data	= mtouch_read_data,
1205 		.alloc		= mtouch_alloc,
1206 		.init		= mtouch_init,
1207 		.exit		= mtouch_exit,
1208 	},
1209 #endif
1210 
1211 #ifdef CONFIG_TOUCHSCREEN_USB_ITM
1212 	[DEVTYPE_ITM] = {
1213 		.min_xc		= 0x0,
1214 		.max_xc		= 0x0fff,
1215 		.min_yc		= 0x0,
1216 		.max_yc		= 0x0fff,
1217 		.max_press	= 0xff,
1218 		.rept_size	= 8,
1219 		.read_data	= itm_read_data,
1220 	},
1221 #endif
1222 
1223 #ifdef CONFIG_TOUCHSCREEN_USB_ETURBO
1224 	[DEVTYPE_ETURBO] = {
1225 		.min_xc		= 0x0,
1226 		.max_xc		= 0x07ff,
1227 		.min_yc		= 0x0,
1228 		.max_yc		= 0x07ff,
1229 		.rept_size	= 8,
1230 		.process_pkt	= usbtouch_process_multi,
1231 		.get_pkt_len	= eturbo_get_pkt_len,
1232 		.read_data	= eturbo_read_data,
1233 	},
1234 #endif
1235 
1236 #ifdef CONFIG_TOUCHSCREEN_USB_GUNZE
1237 	[DEVTYPE_GUNZE] = {
1238 		.min_xc		= 0x0,
1239 		.max_xc		= 0x0fff,
1240 		.min_yc		= 0x0,
1241 		.max_yc		= 0x0fff,
1242 		.rept_size	= 4,
1243 		.read_data	= gunze_read_data,
1244 	},
1245 #endif
1246 
1247 #ifdef CONFIG_TOUCHSCREEN_USB_DMC_TSC10
1248 	[DEVTYPE_DMC_TSC10] = {
1249 		.min_xc		= 0x0,
1250 		.max_xc		= 0x03ff,
1251 		.min_yc		= 0x0,
1252 		.max_yc		= 0x03ff,
1253 		.rept_size	= 5,
1254 		.init		= dmc_tsc10_init,
1255 		.read_data	= dmc_tsc10_read_data,
1256 	},
1257 #endif
1258 
1259 #ifdef CONFIG_TOUCHSCREEN_USB_IRTOUCH
1260 	[DEVTYPE_IRTOUCH] = {
1261 		.min_xc		= 0x0,
1262 		.max_xc		= 0x0fff,
1263 		.min_yc		= 0x0,
1264 		.max_yc		= 0x0fff,
1265 		.rept_size	= 8,
1266 		.read_data	= irtouch_read_data,
1267 	},
1268 
1269 	[DEVTYPE_IRTOUCH_HIRES] = {
1270 		.min_xc		= 0x0,
1271 		.max_xc		= 0x7fff,
1272 		.min_yc		= 0x0,
1273 		.max_yc		= 0x7fff,
1274 		.rept_size	= 8,
1275 		.read_data	= irtouch_read_data,
1276 	},
1277 #endif
1278 
1279 #ifdef CONFIG_TOUCHSCREEN_USB_IDEALTEK
1280 	[DEVTYPE_IDEALTEK] = {
1281 		.min_xc		= 0x0,
1282 		.max_xc		= 0x0fff,
1283 		.min_yc		= 0x0,
1284 		.max_yc		= 0x0fff,
1285 		.rept_size	= 8,
1286 		.process_pkt	= usbtouch_process_multi,
1287 		.get_pkt_len	= idealtek_get_pkt_len,
1288 		.read_data	= idealtek_read_data,
1289 	},
1290 #endif
1291 
1292 #ifdef CONFIG_TOUCHSCREEN_USB_GENERAL_TOUCH
1293 	[DEVTYPE_GENERAL_TOUCH] = {
1294 		.min_xc		= 0x0,
1295 		.max_xc		= 0x7fff,
1296 		.min_yc		= 0x0,
1297 		.max_yc		= 0x7fff,
1298 		.rept_size	= 7,
1299 		.read_data	= general_touch_read_data,
1300 	},
1301 #endif
1302 
1303 #ifdef CONFIG_TOUCHSCREEN_USB_GOTOP
1304 	[DEVTYPE_GOTOP] = {
1305 		.min_xc		= 0x0,
1306 		.max_xc		= 0x03ff,
1307 		.min_yc		= 0x0,
1308 		.max_yc		= 0x03ff,
1309 		.rept_size	= 4,
1310 		.read_data	= gotop_read_data,
1311 	},
1312 #endif
1313 
1314 #ifdef CONFIG_TOUCHSCREEN_USB_JASTEC
1315 	[DEVTYPE_JASTEC] = {
1316 		.min_xc		= 0x0,
1317 		.max_xc		= 0x0fff,
1318 		.min_yc		= 0x0,
1319 		.max_yc		= 0x0fff,
1320 		.rept_size	= 4,
1321 		.read_data	= jastec_read_data,
1322 	},
1323 #endif
1324 
1325 #ifdef CONFIG_TOUCHSCREEN_USB_E2I
1326 	[DEVTYPE_E2I] = {
1327 		.min_xc		= 0x0,
1328 		.max_xc		= 0x7fff,
1329 		.min_yc		= 0x0,
1330 		.max_yc		= 0x7fff,
1331 		.rept_size	= 6,
1332 		.init		= e2i_init,
1333 		.read_data	= e2i_read_data,
1334 	},
1335 #endif
1336 
1337 #ifdef CONFIG_TOUCHSCREEN_USB_ZYTRONIC
1338 	[DEVTYPE_ZYTRONIC] = {
1339 		.min_xc		= 0x0,
1340 		.max_xc		= 0x03ff,
1341 		.min_yc		= 0x0,
1342 		.max_yc		= 0x03ff,
1343 		.rept_size	= 5,
1344 		.read_data	= zytronic_read_data,
1345 		.irq_always     = true,
1346 	},
1347 #endif
1348 
1349 #ifdef CONFIG_TOUCHSCREEN_USB_ETT_TC45USB
1350 	[DEVTYPE_TC45USB] = {
1351 		.min_xc		= 0x0,
1352 		.max_xc		= 0x0fff,
1353 		.min_yc		= 0x0,
1354 		.max_yc		= 0x0fff,
1355 		.rept_size	= 5,
1356 		.read_data	= tc45usb_read_data,
1357 	},
1358 #endif
1359 
1360 #ifdef CONFIG_TOUCHSCREEN_USB_NEXIO
1361 	[DEVTYPE_NEXIO] = {
1362 		.rept_size	= 1024,
1363 		.irq_always	= true,
1364 		.read_data	= nexio_read_data,
1365 		.alloc		= nexio_alloc,
1366 		.init		= nexio_init,
1367 		.exit		= nexio_exit,
1368 	},
1369 #endif
1370 #ifdef CONFIG_TOUCHSCREEN_USB_EASYTOUCH
1371 	[DEVTYPE_ETOUCH] = {
1372 		.min_xc		= 0x0,
1373 		.max_xc		= 0x07ff,
1374 		.min_yc		= 0x0,
1375 		.max_yc		= 0x07ff,
1376 		.rept_size	= 16,
1377 		.process_pkt	= usbtouch_process_multi,
1378 		.get_pkt_len	= etouch_get_pkt_len,
1379 		.read_data	= etouch_read_data,
1380 	},
1381 #endif
1382 };
1383 
1384 
1385 /*****************************************************************************
1386  * Generic Part
1387  */
1388 static void usbtouch_process_pkt(struct usbtouch_usb *usbtouch,
1389                                  unsigned char *pkt, int len)
1390 {
1391 	struct usbtouch_device_info *type = usbtouch->type;
1392 
1393 	if (!type->read_data(usbtouch, pkt))
1394 			return;
1395 
1396 	input_report_key(usbtouch->input, BTN_TOUCH, usbtouch->touch);
1397 
1398 	if (swap_xy) {
1399 		input_report_abs(usbtouch->input, ABS_X, usbtouch->y);
1400 		input_report_abs(usbtouch->input, ABS_Y, usbtouch->x);
1401 	} else {
1402 		input_report_abs(usbtouch->input, ABS_X, usbtouch->x);
1403 		input_report_abs(usbtouch->input, ABS_Y, usbtouch->y);
1404 	}
1405 	if (type->max_press)
1406 		input_report_abs(usbtouch->input, ABS_PRESSURE, usbtouch->press);
1407 	input_sync(usbtouch->input);
1408 }
1409 
1410 
1411 #ifdef MULTI_PACKET
1412 static void usbtouch_process_multi(struct usbtouch_usb *usbtouch,
1413                                    unsigned char *pkt, int len)
1414 {
1415 	unsigned char *buffer;
1416 	int pkt_len, pos, buf_len, tmp;
1417 
1418 	/* process buffer */
1419 	if (unlikely(usbtouch->buf_len)) {
1420 		/* try to get size */
1421 		pkt_len = usbtouch->type->get_pkt_len(
1422 				usbtouch->buffer, usbtouch->buf_len);
1423 
1424 		/* drop? */
1425 		if (unlikely(!pkt_len))
1426 			goto out_flush_buf;
1427 
1428 		/* need to append -pkt_len bytes before able to get size */
1429 		if (unlikely(pkt_len < 0)) {
1430 			int append = -pkt_len;
1431 			if (unlikely(append > len))
1432 			       append = len;
1433 			if (usbtouch->buf_len + append >= usbtouch->type->rept_size)
1434 				goto out_flush_buf;
1435 			memcpy(usbtouch->buffer + usbtouch->buf_len, pkt, append);
1436 			usbtouch->buf_len += append;
1437 
1438 			pkt_len = usbtouch->type->get_pkt_len(
1439 					usbtouch->buffer, usbtouch->buf_len);
1440 			if (pkt_len < 0)
1441 				return;
1442 		}
1443 
1444 		/* append */
1445 		tmp = pkt_len - usbtouch->buf_len;
1446 		if (usbtouch->buf_len + tmp >= usbtouch->type->rept_size)
1447 			goto out_flush_buf;
1448 		memcpy(usbtouch->buffer + usbtouch->buf_len, pkt, tmp);
1449 		usbtouch_process_pkt(usbtouch, usbtouch->buffer, pkt_len);
1450 
1451 		buffer = pkt + tmp;
1452 		buf_len = len - tmp;
1453 	} else {
1454 		buffer = pkt;
1455 		buf_len = len;
1456 	}
1457 
1458 	/* loop over the received packet, process */
1459 	pos = 0;
1460 	while (pos < buf_len) {
1461 		/* get packet len */
1462 		pkt_len = usbtouch->type->get_pkt_len(buffer + pos,
1463 							buf_len - pos);
1464 
1465 		/* unknown packet: skip one byte */
1466 		if (unlikely(!pkt_len)) {
1467 			pos++;
1468 			continue;
1469 		}
1470 
1471 		/* full packet: process */
1472 		if (likely((pkt_len > 0) && (pkt_len <= buf_len - pos))) {
1473 			usbtouch_process_pkt(usbtouch, buffer + pos, pkt_len);
1474 		} else {
1475 			/* incomplete packet: save in buffer */
1476 			memcpy(usbtouch->buffer, buffer + pos, buf_len - pos);
1477 			usbtouch->buf_len = buf_len - pos;
1478 			return;
1479 		}
1480 		pos += pkt_len;
1481 	}
1482 
1483 out_flush_buf:
1484 	usbtouch->buf_len = 0;
1485 	return;
1486 }
1487 #endif
1488 
1489 
1490 static void usbtouch_irq(struct urb *urb)
1491 {
1492 	struct usbtouch_usb *usbtouch = urb->context;
1493 	struct device *dev = &usbtouch->interface->dev;
1494 	int retval;
1495 
1496 	switch (urb->status) {
1497 	case 0:
1498 		/* success */
1499 		break;
1500 	case -ETIME:
1501 		/* this urb is timing out */
1502 		dev_dbg(dev,
1503 			"%s - urb timed out - was the device unplugged?\n",
1504 			__func__);
1505 		return;
1506 	case -ECONNRESET:
1507 	case -ENOENT:
1508 	case -ESHUTDOWN:
1509 	case -EPIPE:
1510 		/* this urb is terminated, clean up */
1511 		dev_dbg(dev, "%s - urb shutting down with status: %d\n",
1512 			__func__, urb->status);
1513 		return;
1514 	default:
1515 		dev_dbg(dev, "%s - nonzero urb status received: %d\n",
1516 			__func__, urb->status);
1517 		goto exit;
1518 	}
1519 
1520 	usbtouch->type->process_pkt(usbtouch, usbtouch->data, urb->actual_length);
1521 
1522 exit:
1523 	usb_mark_last_busy(interface_to_usbdev(usbtouch->interface));
1524 	retval = usb_submit_urb(urb, GFP_ATOMIC);
1525 	if (retval)
1526 		dev_err(dev, "%s - usb_submit_urb failed with result: %d\n",
1527 			__func__, retval);
1528 }
1529 
1530 static int usbtouch_open(struct input_dev *input)
1531 {
1532 	struct usbtouch_usb *usbtouch = input_get_drvdata(input);
1533 	int r;
1534 
1535 	usbtouch->irq->dev = interface_to_usbdev(usbtouch->interface);
1536 
1537 	r = usb_autopm_get_interface(usbtouch->interface) ? -EIO : 0;
1538 	if (r < 0)
1539 		goto out;
1540 
1541 	mutex_lock(&usbtouch->pm_mutex);
1542 	if (!usbtouch->type->irq_always) {
1543 		if (usb_submit_urb(usbtouch->irq, GFP_KERNEL)) {
1544 			r = -EIO;
1545 			goto out_put;
1546 		}
1547 	}
1548 
1549 	usbtouch->interface->needs_remote_wakeup = 1;
1550 	usbtouch->is_open = true;
1551 out_put:
1552 	mutex_unlock(&usbtouch->pm_mutex);
1553 	usb_autopm_put_interface(usbtouch->interface);
1554 out:
1555 	return r;
1556 }
1557 
1558 static void usbtouch_close(struct input_dev *input)
1559 {
1560 	struct usbtouch_usb *usbtouch = input_get_drvdata(input);
1561 	int r;
1562 
1563 	mutex_lock(&usbtouch->pm_mutex);
1564 	if (!usbtouch->type->irq_always)
1565 		usb_kill_urb(usbtouch->irq);
1566 	usbtouch->is_open = false;
1567 	mutex_unlock(&usbtouch->pm_mutex);
1568 
1569 	r = usb_autopm_get_interface(usbtouch->interface);
1570 	usbtouch->interface->needs_remote_wakeup = 0;
1571 	if (!r)
1572 		usb_autopm_put_interface(usbtouch->interface);
1573 }
1574 
1575 static int usbtouch_suspend
1576 (struct usb_interface *intf, pm_message_t message)
1577 {
1578 	struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);
1579 
1580 	usb_kill_urb(usbtouch->irq);
1581 
1582 	return 0;
1583 }
1584 
1585 static int usbtouch_resume(struct usb_interface *intf)
1586 {
1587 	struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);
1588 	int result = 0;
1589 
1590 	mutex_lock(&usbtouch->pm_mutex);
1591 	if (usbtouch->is_open || usbtouch->type->irq_always)
1592 		result = usb_submit_urb(usbtouch->irq, GFP_NOIO);
1593 	mutex_unlock(&usbtouch->pm_mutex);
1594 
1595 	return result;
1596 }
1597 
1598 static int usbtouch_reset_resume(struct usb_interface *intf)
1599 {
1600 	struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);
1601 	int err = 0;
1602 
1603 	/* reinit the device */
1604 	if (usbtouch->type->init) {
1605 		err = usbtouch->type->init(usbtouch);
1606 		if (err) {
1607 			dev_dbg(&intf->dev,
1608 				"%s - type->init() failed, err: %d\n",
1609 				__func__, err);
1610 			return err;
1611 		}
1612 	}
1613 
1614 	/* restart IO if needed */
1615 	mutex_lock(&usbtouch->pm_mutex);
1616 	if (usbtouch->is_open)
1617 		err = usb_submit_urb(usbtouch->irq, GFP_NOIO);
1618 	mutex_unlock(&usbtouch->pm_mutex);
1619 
1620 	return err;
1621 }
1622 
1623 static void usbtouch_free_buffers(struct usb_device *udev,
1624 				  struct usbtouch_usb *usbtouch)
1625 {
1626 	usb_free_coherent(udev, usbtouch->data_size,
1627 			  usbtouch->data, usbtouch->data_dma);
1628 	kfree(usbtouch->buffer);
1629 }
1630 
1631 static struct usb_endpoint_descriptor *
1632 usbtouch_get_input_endpoint(struct usb_host_interface *interface)
1633 {
1634 	int i;
1635 
1636 	for (i = 0; i < interface->desc.bNumEndpoints; i++)
1637 		if (usb_endpoint_dir_in(&interface->endpoint[i].desc))
1638 			return &interface->endpoint[i].desc;
1639 
1640 	return NULL;
1641 }
1642 
1643 static int usbtouch_probe(struct usb_interface *intf,
1644 			  const struct usb_device_id *id)
1645 {
1646 	struct usbtouch_usb *usbtouch;
1647 	struct input_dev *input_dev;
1648 	struct usb_endpoint_descriptor *endpoint;
1649 	struct usb_device *udev = interface_to_usbdev(intf);
1650 	struct usbtouch_device_info *type;
1651 	int err = -ENOMEM;
1652 
1653 	/* some devices are ignored */
1654 	if (id->driver_info == DEVTYPE_IGNORE)
1655 		return -ENODEV;
1656 
1657 	if (id->driver_info >= ARRAY_SIZE(usbtouch_dev_info))
1658 		return -ENODEV;
1659 
1660 	endpoint = usbtouch_get_input_endpoint(intf->cur_altsetting);
1661 	if (!endpoint)
1662 		return -ENXIO;
1663 
1664 	usbtouch = kzalloc(sizeof(struct usbtouch_usb), GFP_KERNEL);
1665 	input_dev = input_allocate_device();
1666 	if (!usbtouch || !input_dev)
1667 		goto out_free;
1668 
1669 	mutex_init(&usbtouch->pm_mutex);
1670 
1671 	type = &usbtouch_dev_info[id->driver_info];
1672 	usbtouch->type = type;
1673 	if (!type->process_pkt)
1674 		type->process_pkt = usbtouch_process_pkt;
1675 
1676 	usbtouch->data_size = type->rept_size;
1677 	if (type->get_pkt_len) {
1678 		/*
1679 		 * When dealing with variable-length packets we should
1680 		 * not request more than wMaxPacketSize bytes at once
1681 		 * as we do not know if there is more data coming or
1682 		 * we filled exactly wMaxPacketSize bytes and there is
1683 		 * nothing else.
1684 		 */
1685 		usbtouch->data_size = min(usbtouch->data_size,
1686 					  usb_endpoint_maxp(endpoint));
1687 	}
1688 
1689 	usbtouch->data = usb_alloc_coherent(udev, usbtouch->data_size,
1690 					    GFP_KERNEL, &usbtouch->data_dma);
1691 	if (!usbtouch->data)
1692 		goto out_free;
1693 
1694 	if (type->get_pkt_len) {
1695 		usbtouch->buffer = kmalloc(type->rept_size, GFP_KERNEL);
1696 		if (!usbtouch->buffer)
1697 			goto out_free_buffers;
1698 	}
1699 
1700 	usbtouch->irq = usb_alloc_urb(0, GFP_KERNEL);
1701 	if (!usbtouch->irq) {
1702 		dev_dbg(&intf->dev,
1703 			"%s - usb_alloc_urb failed: usbtouch->irq\n", __func__);
1704 		goto out_free_buffers;
1705 	}
1706 
1707 	usbtouch->interface = intf;
1708 	usbtouch->input = input_dev;
1709 
1710 	if (udev->manufacturer)
1711 		strscpy(usbtouch->name, udev->manufacturer, sizeof(usbtouch->name));
1712 
1713 	if (udev->product) {
1714 		if (udev->manufacturer)
1715 			strlcat(usbtouch->name, " ", sizeof(usbtouch->name));
1716 		strlcat(usbtouch->name, udev->product, sizeof(usbtouch->name));
1717 	}
1718 
1719 	if (!strlen(usbtouch->name))
1720 		snprintf(usbtouch->name, sizeof(usbtouch->name),
1721 			"USB Touchscreen %04x:%04x",
1722 			 le16_to_cpu(udev->descriptor.idVendor),
1723 			 le16_to_cpu(udev->descriptor.idProduct));
1724 
1725 	usb_make_path(udev, usbtouch->phys, sizeof(usbtouch->phys));
1726 	strlcat(usbtouch->phys, "/input0", sizeof(usbtouch->phys));
1727 
1728 	input_dev->name = usbtouch->name;
1729 	input_dev->phys = usbtouch->phys;
1730 	usb_to_input_id(udev, &input_dev->id);
1731 	input_dev->dev.parent = &intf->dev;
1732 
1733 	input_set_drvdata(input_dev, usbtouch);
1734 
1735 	input_dev->open = usbtouch_open;
1736 	input_dev->close = usbtouch_close;
1737 
1738 	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
1739 	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
1740 	input_set_abs_params(input_dev, ABS_X, type->min_xc, type->max_xc, 0, 0);
1741 	input_set_abs_params(input_dev, ABS_Y, type->min_yc, type->max_yc, 0, 0);
1742 	if (type->max_press)
1743 		input_set_abs_params(input_dev, ABS_PRESSURE, type->min_press,
1744 		                     type->max_press, 0, 0);
1745 
1746 	if (usb_endpoint_type(endpoint) == USB_ENDPOINT_XFER_INT)
1747 		usb_fill_int_urb(usbtouch->irq, udev,
1748 			 usb_rcvintpipe(udev, endpoint->bEndpointAddress),
1749 			 usbtouch->data, usbtouch->data_size,
1750 			 usbtouch_irq, usbtouch, endpoint->bInterval);
1751 	else
1752 		usb_fill_bulk_urb(usbtouch->irq, udev,
1753 			 usb_rcvbulkpipe(udev, endpoint->bEndpointAddress),
1754 			 usbtouch->data, usbtouch->data_size,
1755 			 usbtouch_irq, usbtouch);
1756 
1757 	usbtouch->irq->dev = udev;
1758 	usbtouch->irq->transfer_dma = usbtouch->data_dma;
1759 	usbtouch->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1760 
1761 	/* device specific allocations */
1762 	if (type->alloc) {
1763 		err = type->alloc(usbtouch);
1764 		if (err) {
1765 			dev_dbg(&intf->dev,
1766 				"%s - type->alloc() failed, err: %d\n",
1767 				__func__, err);
1768 			goto out_free_urb;
1769 		}
1770 	}
1771 
1772 	/* device specific initialisation*/
1773 	if (type->init) {
1774 		err = type->init(usbtouch);
1775 		if (err) {
1776 			dev_dbg(&intf->dev,
1777 				"%s - type->init() failed, err: %d\n",
1778 				__func__, err);
1779 			goto out_do_exit;
1780 		}
1781 	}
1782 
1783 	err = input_register_device(usbtouch->input);
1784 	if (err) {
1785 		dev_dbg(&intf->dev,
1786 			"%s - input_register_device failed, err: %d\n",
1787 			__func__, err);
1788 		goto out_do_exit;
1789 	}
1790 
1791 	usb_set_intfdata(intf, usbtouch);
1792 
1793 	if (usbtouch->type->irq_always) {
1794 		/* this can't fail */
1795 		usb_autopm_get_interface(intf);
1796 		err = usb_submit_urb(usbtouch->irq, GFP_KERNEL);
1797 		if (err) {
1798 			usb_autopm_put_interface(intf);
1799 			dev_err(&intf->dev,
1800 				"%s - usb_submit_urb failed with result: %d\n",
1801 				__func__, err);
1802 			goto out_unregister_input;
1803 		}
1804 	}
1805 
1806 	return 0;
1807 
1808 out_unregister_input:
1809 	input_unregister_device(input_dev);
1810 	input_dev = NULL;
1811 out_do_exit:
1812 	if (type->exit)
1813 		type->exit(usbtouch);
1814 out_free_urb:
1815 	usb_free_urb(usbtouch->irq);
1816 out_free_buffers:
1817 	usbtouch_free_buffers(udev, usbtouch);
1818 out_free:
1819 	input_free_device(input_dev);
1820 	kfree(usbtouch);
1821 	return err;
1822 }
1823 
1824 static void usbtouch_disconnect(struct usb_interface *intf)
1825 {
1826 	struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);
1827 
1828 	if (!usbtouch)
1829 		return;
1830 
1831 	dev_dbg(&intf->dev,
1832 		"%s - usbtouch is initialized, cleaning up\n", __func__);
1833 
1834 	usb_set_intfdata(intf, NULL);
1835 	/* this will stop IO via close */
1836 	input_unregister_device(usbtouch->input);
1837 	usb_free_urb(usbtouch->irq);
1838 	if (usbtouch->type->exit)
1839 		usbtouch->type->exit(usbtouch);
1840 	usbtouch_free_buffers(interface_to_usbdev(intf), usbtouch);
1841 	kfree(usbtouch);
1842 }
1843 
1844 MODULE_DEVICE_TABLE(usb, usbtouch_devices);
1845 
1846 static struct usb_driver usbtouch_driver = {
1847 	.name		= "usbtouchscreen",
1848 	.probe		= usbtouch_probe,
1849 	.disconnect	= usbtouch_disconnect,
1850 	.suspend	= usbtouch_suspend,
1851 	.resume		= usbtouch_resume,
1852 	.reset_resume	= usbtouch_reset_resume,
1853 	.id_table	= usbtouch_devices,
1854 	.supports_autosuspend = 1,
1855 };
1856 
1857 module_usb_driver(usbtouch_driver);
1858 
1859 MODULE_AUTHOR("Daniel Ritz <daniel.ritz@gmx.ch>");
1860 MODULE_DESCRIPTION("USB Touchscreen Driver");
1861 MODULE_LICENSE("GPL");
1862 
1863 MODULE_ALIAS("touchkitusb");
1864 MODULE_ALIAS("itmtouch");
1865 MODULE_ALIAS("mtouchusb");
1866