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1/* -*- linux-c -*-
2
3GTCO digitizer USB driver
4
5Use the err() and dbg() macros from usb.h for system logging
6
7TO CHECK: Is pressure done right on report 5?
8
9Copyright (C) 2006 GTCO CalComp
10
11This program is free software; you can redistribute it and/or
12modify it under the terms of the GNU General Public License
13as published by the Free Software Foundation; version 2
14of the License.
15
16This program is distributed in the hope that it will be useful,
17but WITHOUT ANY WARRANTY; without even the implied warranty of
18MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19GNU General Public License for more details.
20
21You should have received a copy of the GNU General Public License
22along with this program; if not, write to the Free Software
23Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
24
25Permission to use, copy, modify, distribute, and sell this software and its
26documentation for any purpose is hereby granted without fee, provided that
27the above copyright notice appear in all copies and that both that
28copyright notice and this permission notice appear in supporting
29documentation, and that the name of GTCO-CalComp not be used in advertising
30or publicity pertaining to distribution of the software without specific,
31written prior permission. GTCO-CalComp makes no representations about the
32suitability of this software for any purpose. It is provided "as is"
33without express or implied warranty.
34
35GTCO-CALCOMP DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
36INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
37EVENT SHALL GTCO-CALCOMP BE LIABLE FOR ANY SPECIAL, INDIRECT OR
38CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
39DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
40TORTIOUS ACTIONS, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
41PERFORMANCE OF THIS SOFTWARE.
42
43GTCO CalComp, Inc.
447125 Riverwood Drive
45Columbia, MD 21046
46
47Jeremy Roberson jroberson@gtcocalcomp.com
48Scott Hill shill@gtcocalcomp.com
49*/
50
51
52
53/*#define DEBUG*/
54
55#include <linux/kernel.h>
56#include <linux/module.h>
57#include <linux/errno.h>
58#include <linux/init.h>
59#include <linux/slab.h>
60#include <linux/input.h>
61#include <linux/usb.h>
62#include <asm/uaccess.h>
63#include <asm/unaligned.h>
64#include <asm/byteorder.h>
65
66
67#include <linux/usb/input.h>
68
69/* Version with a Major number of 2 is for kernel inclusion only. */
70#define GTCO_VERSION "2.00.0006"
71
72
73/* MACROS */
74
75#define VENDOR_ID_GTCO 0x078C
76#define PID_400 0x400
77#define PID_401 0x401
78#define PID_1000 0x1000
79#define PID_1001 0x1001
80#define PID_1002 0x1002
81
82/* Max size of a single report */
83#define REPORT_MAX_SIZE 10
84
85
86/* Bitmask whether pen is in range */
87#define MASK_INRANGE 0x20
88#define MASK_BUTTON 0x01F
89
90#define PATHLENGTH 64
91
92/* DATA STRUCTURES */
93
94/* Device table */
95static const struct usb_device_id gtco_usbid_table[] = {
96 { USB_DEVICE(VENDOR_ID_GTCO, PID_400) },
97 { USB_DEVICE(VENDOR_ID_GTCO, PID_401) },
98 { USB_DEVICE(VENDOR_ID_GTCO, PID_1000) },
99 { USB_DEVICE(VENDOR_ID_GTCO, PID_1001) },
100 { USB_DEVICE(VENDOR_ID_GTCO, PID_1002) },
101 { }
102};
103MODULE_DEVICE_TABLE (usb, gtco_usbid_table);
104
105
106/* Structure to hold all of our device specific stuff */
107struct gtco {
108
109 struct input_dev *inputdevice; /* input device struct pointer */
110 struct usb_device *usbdev; /* the usb device for this device */
111 struct urb *urbinfo; /* urb for incoming reports */
112 dma_addr_t buf_dma; /* dma addr of the data buffer*/
113 unsigned char * buffer; /* databuffer for reports */
114
115 char usbpath[PATHLENGTH];
116 int openCount;
117
118 /* Information pulled from Report Descriptor */
119 u32 usage;
120 u32 min_X;
121 u32 max_X;
122 u32 min_Y;
123 u32 max_Y;
124 s8 mintilt_X;
125 s8 maxtilt_X;
126 s8 mintilt_Y;
127 s8 maxtilt_Y;
128 u32 maxpressure;
129 u32 minpressure;
130};
131
132
133
134/* Code for parsing the HID REPORT DESCRIPTOR */
135
136/* From HID1.11 spec */
137struct hid_descriptor
138{
139 struct usb_descriptor_header header;
140 __le16 bcdHID;
141 u8 bCountryCode;
142 u8 bNumDescriptors;
143 u8 bDescriptorType;
144 __le16 wDescriptorLength;
145} __attribute__ ((packed));
146
147
148#define HID_DESCRIPTOR_SIZE 9
149#define HID_DEVICE_TYPE 33
150#define REPORT_DEVICE_TYPE 34
151
152
153#define PREF_TAG(x) ((x)>>4)
154#define PREF_TYPE(x) ((x>>2)&0x03)
155#define PREF_SIZE(x) ((x)&0x03)
156
157#define TYPE_MAIN 0
158#define TYPE_GLOBAL 1
159#define TYPE_LOCAL 2
160#define TYPE_RESERVED 3
161
162#define TAG_MAIN_INPUT 0x8
163#define TAG_MAIN_OUTPUT 0x9
164#define TAG_MAIN_FEATURE 0xB
165#define TAG_MAIN_COL_START 0xA
166#define TAG_MAIN_COL_END 0xC
167
168#define TAG_GLOB_USAGE 0
169#define TAG_GLOB_LOG_MIN 1
170#define TAG_GLOB_LOG_MAX 2
171#define TAG_GLOB_PHYS_MIN 3
172#define TAG_GLOB_PHYS_MAX 4
173#define TAG_GLOB_UNIT_EXP 5
174#define TAG_GLOB_UNIT 6
175#define TAG_GLOB_REPORT_SZ 7
176#define TAG_GLOB_REPORT_ID 8
177#define TAG_GLOB_REPORT_CNT 9
178#define TAG_GLOB_PUSH 10
179#define TAG_GLOB_POP 11
180
181#define TAG_GLOB_MAX 12
182
183#define DIGITIZER_USAGE_TIP_PRESSURE 0x30
184#define DIGITIZER_USAGE_TILT_X 0x3D
185#define DIGITIZER_USAGE_TILT_Y 0x3E
186
187
188/*
189 * This is an abbreviated parser for the HID Report Descriptor. We
190 * know what devices we are talking to, so this is by no means meant
191 * to be generic. We can make some safe assumptions:
192 *
193 * - We know there are no LONG tags, all short
194 * - We know that we have no MAIN Feature and MAIN Output items
195 * - We know what the IRQ reports are supposed to look like.
196 *
197 * The main purpose of this is to use the HID report desc to figure
198 * out the mins and maxs of the fields in the IRQ reports. The IRQ
199 * reports for 400/401 change slightly if the max X is bigger than 64K.
200 *
201 */
202static void parse_hid_report_descriptor(struct gtco *device, char * report,
203 int length)
204{
205 int x, i = 0;
206
207 /* Tag primitive vars */
208 __u8 prefix;
209 __u8 size;
210 __u8 tag;
211 __u8 type;
212 __u8 data = 0;
213 __u16 data16 = 0;
214 __u32 data32 = 0;
215
216 /* For parsing logic */
217 int inputnum = 0;
218 __u32 usage = 0;
219
220 /* Global Values, indexed by TAG */
221 __u32 globalval[TAG_GLOB_MAX];
222 __u32 oldval[TAG_GLOB_MAX];
223
224 /* Debug stuff */
225 char maintype = 'x';
226 char globtype[12];
227 int indent = 0;
228 char indentstr[10] = "";
229
230
231 dbg("======>>>>>>PARSE<<<<<<======");
232
233 /* Walk this report and pull out the info we need */
234 while (i < length) {
235 prefix = report[i];
236
237 /* Skip over prefix */
238 i++;
239
240 /* Determine data size and save the data in the proper variable */
241 size = PREF_SIZE(prefix);
242 switch (size) {
243 case 1:
244 data = report[i];
245 break;
246 case 2:
247 data16 = get_unaligned_le16(&report[i]);
248 break;
249 case 3:
250 size = 4;
251 data32 = get_unaligned_le32(&report[i]);
252 break;
253 }
254
255 /* Skip size of data */
256 i += size;
257
258 /* What we do depends on the tag type */
259 tag = PREF_TAG(prefix);
260 type = PREF_TYPE(prefix);
261 switch (type) {
262 case TYPE_MAIN:
263 strcpy(globtype, "");
264 switch (tag) {
265
266 case TAG_MAIN_INPUT:
267 /*
268 * The INPUT MAIN tag signifies this is
269 * information from a report. We need to
270 * figure out what it is and store the
271 * min/max values
272 */
273
274 maintype = 'I';
275 if (data == 2)
276 strcpy(globtype, "Variable");
277 else if (data == 3)
278 strcpy(globtype, "Var|Const");
279
280 dbg("::::: Saving Report: %d input #%d Max: 0x%X(%d) Min:0x%X(%d) of %d bits",
281 globalval[TAG_GLOB_REPORT_ID], inputnum,
282 globalval[TAG_GLOB_LOG_MAX], globalval[TAG_GLOB_LOG_MAX],
283 globalval[TAG_GLOB_LOG_MIN], globalval[TAG_GLOB_LOG_MIN],
284 globalval[TAG_GLOB_REPORT_SZ] * globalval[TAG_GLOB_REPORT_CNT]);
285
286
287 /*
288 We can assume that the first two input items
289 are always the X and Y coordinates. After
290 that, we look for everything else by
291 local usage value
292 */
293 switch (inputnum) {
294 case 0: /* X coord */
295 dbg("GER: X Usage: 0x%x", usage);
296 if (device->max_X == 0) {
297 device->max_X = globalval[TAG_GLOB_LOG_MAX];
298 device->min_X = globalval[TAG_GLOB_LOG_MIN];
299 }
300 break;
301
302 case 1: /* Y coord */
303 dbg("GER: Y Usage: 0x%x", usage);
304 if (device->max_Y == 0) {
305 device->max_Y = globalval[TAG_GLOB_LOG_MAX];
306 device->min_Y = globalval[TAG_GLOB_LOG_MIN];
307 }
308 break;
309
310 default:
311 /* Tilt X */
312 if (usage == DIGITIZER_USAGE_TILT_X) {
313 if (device->maxtilt_X == 0) {
314 device->maxtilt_X = globalval[TAG_GLOB_LOG_MAX];
315 device->mintilt_X = globalval[TAG_GLOB_LOG_MIN];
316 }
317 }
318
319 /* Tilt Y */
320 if (usage == DIGITIZER_USAGE_TILT_Y) {
321 if (device->maxtilt_Y == 0) {
322 device->maxtilt_Y = globalval[TAG_GLOB_LOG_MAX];
323 device->mintilt_Y = globalval[TAG_GLOB_LOG_MIN];
324 }
325 }
326
327 /* Pressure */
328 if (usage == DIGITIZER_USAGE_TIP_PRESSURE) {
329 if (device->maxpressure == 0) {
330 device->maxpressure = globalval[TAG_GLOB_LOG_MAX];
331 device->minpressure = globalval[TAG_GLOB_LOG_MIN];
332 }
333 }
334
335 break;
336 }
337
338 inputnum++;
339 break;
340
341 case TAG_MAIN_OUTPUT:
342 maintype = 'O';
343 break;
344
345 case TAG_MAIN_FEATURE:
346 maintype = 'F';
347 break;
348
349 case TAG_MAIN_COL_START:
350 maintype = 'S';
351
352 if (data == 0) {
353 dbg("======>>>>>> Physical");
354 strcpy(globtype, "Physical");
355 } else
356 dbg("======>>>>>>");
357
358 /* Indent the debug output */
359 indent++;
360 for (x = 0; x < indent; x++)
361 indentstr[x] = '-';
362 indentstr[x] = 0;
363
364 /* Save global tags */
365 for (x = 0; x < TAG_GLOB_MAX; x++)
366 oldval[x] = globalval[x];
367
368 break;
369
370 case TAG_MAIN_COL_END:
371 dbg("<<<<<<======");
372 maintype = 'E';
373 indent--;
374 for (x = 0; x < indent; x++)
375 indentstr[x] = '-';
376 indentstr[x] = 0;
377
378 /* Copy global tags back */
379 for (x = 0; x < TAG_GLOB_MAX; x++)
380 globalval[x] = oldval[x];
381
382 break;
383 }
384
385 switch (size) {
386 case 1:
387 dbg("%sMAINTAG:(%d) %c SIZE: %d Data: %s 0x%x",
388 indentstr, tag, maintype, size, globtype, data);
389 break;
390
391 case 2:
392 dbg("%sMAINTAG:(%d) %c SIZE: %d Data: %s 0x%x",
393 indentstr, tag, maintype, size, globtype, data16);
394 break;
395
396 case 4:
397 dbg("%sMAINTAG:(%d) %c SIZE: %d Data: %s 0x%x",
398 indentstr, tag, maintype, size, globtype, data32);
399 break;
400 }
401 break;
402
403 case TYPE_GLOBAL:
404 switch (tag) {
405 case TAG_GLOB_USAGE:
406 /*
407 * First time we hit the global usage tag,
408 * it should tell us the type of device
409 */
410 if (device->usage == 0)
411 device->usage = data;
412
413 strcpy(globtype, "USAGE");
414 break;
415
416 case TAG_GLOB_LOG_MIN:
417 strcpy(globtype, "LOG_MIN");
418 break;
419
420 case TAG_GLOB_LOG_MAX:
421 strcpy(globtype, "LOG_MAX");
422 break;
423
424 case TAG_GLOB_PHYS_MIN:
425 strcpy(globtype, "PHYS_MIN");
426 break;
427
428 case TAG_GLOB_PHYS_MAX:
429 strcpy(globtype, "PHYS_MAX");
430 break;
431
432 case TAG_GLOB_UNIT_EXP:
433 strcpy(globtype, "EXP");
434 break;
435
436 case TAG_GLOB_UNIT:
437 strcpy(globtype, "UNIT");
438 break;
439
440 case TAG_GLOB_REPORT_SZ:
441 strcpy(globtype, "REPORT_SZ");
442 break;
443
444 case TAG_GLOB_REPORT_ID:
445 strcpy(globtype, "REPORT_ID");
446 /* New report, restart numbering */
447 inputnum = 0;
448 break;
449
450 case TAG_GLOB_REPORT_CNT:
451 strcpy(globtype, "REPORT_CNT");
452 break;
453
454 case TAG_GLOB_PUSH:
455 strcpy(globtype, "PUSH");
456 break;
457
458 case TAG_GLOB_POP:
459 strcpy(globtype, "POP");
460 break;
461 }
462
463 /* Check to make sure we have a good tag number
464 so we don't overflow array */
465 if (tag < TAG_GLOB_MAX) {
466 switch (size) {
467 case 1:
468 dbg("%sGLOBALTAG:%s(%d) SIZE: %d Data: 0x%x",
469 indentstr, globtype, tag, size, data);
470 globalval[tag] = data;
471 break;
472
473 case 2:
474 dbg("%sGLOBALTAG:%s(%d) SIZE: %d Data: 0x%x",
475 indentstr, globtype, tag, size, data16);
476 globalval[tag] = data16;
477 break;
478
479 case 4:
480 dbg("%sGLOBALTAG:%s(%d) SIZE: %d Data: 0x%x",
481 indentstr, globtype, tag, size, data32);
482 globalval[tag] = data32;
483 break;
484 }
485 } else {
486 dbg("%sGLOBALTAG: ILLEGAL TAG:%d SIZE: %d ",
487 indentstr, tag, size);
488 }
489 break;
490
491 case TYPE_LOCAL:
492 switch (tag) {
493 case TAG_GLOB_USAGE:
494 strcpy(globtype, "USAGE");
495 /* Always 1 byte */
496 usage = data;
497 break;
498
499 case TAG_GLOB_LOG_MIN:
500 strcpy(globtype, "MIN");
501 break;
502
503 case TAG_GLOB_LOG_MAX:
504 strcpy(globtype, "MAX");
505 break;
506
507 default:
508 strcpy(globtype, "UNKNOWN");
509 break;
510 }
511
512 switch (size) {
513 case 1:
514 dbg("%sLOCALTAG:(%d) %s SIZE: %d Data: 0x%x",
515 indentstr, tag, globtype, size, data);
516 break;
517
518 case 2:
519 dbg("%sLOCALTAG:(%d) %s SIZE: %d Data: 0x%x",
520 indentstr, tag, globtype, size, data16);
521 break;
522
523 case 4:
524 dbg("%sLOCALTAG:(%d) %s SIZE: %d Data: 0x%x",
525 indentstr, tag, globtype, size, data32);
526 break;
527 }
528
529 break;
530 }
531 }
532}
533
534/* INPUT DRIVER Routines */
535
536/*
537 * Called when opening the input device. This will submit the URB to
538 * the usb system so we start getting reports
539 */
540static int gtco_input_open(struct input_dev *inputdev)
541{
542 struct gtco *device = input_get_drvdata(inputdev);
543
544 device->urbinfo->dev = device->usbdev;
545 if (usb_submit_urb(device->urbinfo, GFP_KERNEL))
546 return -EIO;
547
548 return 0;
549}
550
551/*
552 * Called when closing the input device. This will unlink the URB
553 */
554static void gtco_input_close(struct input_dev *inputdev)
555{
556 struct gtco *device = input_get_drvdata(inputdev);
557
558 usb_kill_urb(device->urbinfo);
559}
560
561
562/*
563 * Setup input device capabilities. Tell the input system what this
564 * device is capable of generating.
565 *
566 * This information is based on what is read from the HID report and
567 * placed in the struct gtco structure
568 *
569 */
570static void gtco_setup_caps(struct input_dev *inputdev)
571{
572 struct gtco *device = input_get_drvdata(inputdev);
573
574 /* Which events */
575 inputdev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) |
576 BIT_MASK(EV_MSC);
577
578 /* Misc event menu block */
579 inputdev->mscbit[0] = BIT_MASK(MSC_SCAN) | BIT_MASK(MSC_SERIAL) |
580 BIT_MASK(MSC_RAW);
581
582 /* Absolute values based on HID report info */
583 input_set_abs_params(inputdev, ABS_X, device->min_X, device->max_X,
584 0, 0);
585 input_set_abs_params(inputdev, ABS_Y, device->min_Y, device->max_Y,
586 0, 0);
587
588 /* Proximity */
589 input_set_abs_params(inputdev, ABS_DISTANCE, 0, 1, 0, 0);
590
591 /* Tilt & pressure */
592 input_set_abs_params(inputdev, ABS_TILT_X, device->mintilt_X,
593 device->maxtilt_X, 0, 0);
594 input_set_abs_params(inputdev, ABS_TILT_Y, device->mintilt_Y,
595 device->maxtilt_Y, 0, 0);
596 input_set_abs_params(inputdev, ABS_PRESSURE, device->minpressure,
597 device->maxpressure, 0, 0);
598
599 /* Transducer */
600 input_set_abs_params(inputdev, ABS_MISC, 0, 0xFF, 0, 0);
601}
602
603/* USB Routines */
604
605/*
606 * URB callback routine. Called when we get IRQ reports from the
607 * digitizer.
608 *
609 * This bridges the USB and input device worlds. It generates events
610 * on the input device based on the USB reports.
611 */
612static void gtco_urb_callback(struct urb *urbinfo)
613{
614 struct gtco *device = urbinfo->context;
615 struct input_dev *inputdev;
616 int rc;
617 u32 val = 0;
618 s8 valsigned = 0;
619 char le_buffer[2];
620
621 inputdev = device->inputdevice;
622
623 /* Was callback OK? */
624 if (urbinfo->status == -ECONNRESET ||
625 urbinfo->status == -ENOENT ||
626 urbinfo->status == -ESHUTDOWN) {
627
628 /* Shutdown is occurring. Return and don't queue up any more */
629 return;
630 }
631
632 if (urbinfo->status != 0) {
633 /*
634 * Some unknown error. Hopefully temporary. Just go and
635 * requeue an URB
636 */
637 goto resubmit;
638 }
639
640 /*
641 * Good URB, now process
642 */
643
644 /* PID dependent when we interpret the report */
645 if (inputdev->id.product == PID_1000 ||
646 inputdev->id.product == PID_1001 ||
647 inputdev->id.product == PID_1002) {
648
649 /*
650 * Switch on the report ID
651 * Conveniently, the reports have more information, the higher
652 * the report number. We can just fall through the case
653 * statements if we start with the highest number report
654 */
655 switch (device->buffer[0]) {
656 case 5:
657 /* Pressure is 9 bits */
658 val = ((u16)(device->buffer[8]) << 1);
659 val |= (u16)(device->buffer[7] >> 7);
660 input_report_abs(inputdev, ABS_PRESSURE,
661 device->buffer[8]);
662
663 /* Mask out the Y tilt value used for pressure */
664 device->buffer[7] = (u8)((device->buffer[7]) & 0x7F);
665
666 /* Fall thru */
667 case 4:
668 /* Tilt */
669
670 /* Sign extend these 7 bit numbers. */
671 if (device->buffer[6] & 0x40)
672 device->buffer[6] |= 0x80;
673
674 if (device->buffer[7] & 0x40)
675 device->buffer[7] |= 0x80;
676
677
678 valsigned = (device->buffer[6]);
679 input_report_abs(inputdev, ABS_TILT_X, (s32)valsigned);
680
681 valsigned = (device->buffer[7]);
682 input_report_abs(inputdev, ABS_TILT_Y, (s32)valsigned);
683
684 /* Fall thru */
685 case 2:
686 case 3:
687 /* Convert buttons, only 5 bits possible */
688 val = (device->buffer[5]) & MASK_BUTTON;
689
690 /* We don't apply any meaning to the bitmask,
691 just report */
692 input_event(inputdev, EV_MSC, MSC_SERIAL, val);
693
694 /* Fall thru */
695 case 1:
696 /* All reports have X and Y coords in the same place */
697 val = get_unaligned_le16(&device->buffer[1]);
698 input_report_abs(inputdev, ABS_X, val);
699
700 val = get_unaligned_le16(&device->buffer[3]);
701 input_report_abs(inputdev, ABS_Y, val);
702
703 /* Ditto for proximity bit */
704 val = device->buffer[5] & MASK_INRANGE ? 1 : 0;
705 input_report_abs(inputdev, ABS_DISTANCE, val);
706
707 /* Report 1 is an exception to how we handle buttons */
708 /* Buttons are an index, not a bitmask */
709 if (device->buffer[0] == 1) {
710
711 /*
712 * Convert buttons, 5 bit index
713 * Report value of index set as one,
714 * the rest as 0
715 */
716 val = device->buffer[5] & MASK_BUTTON;
717 dbg("======>>>>>>REPORT 1: val 0x%X(%d)",
718 val, val);
719
720 /*
721 * We don't apply any meaning to the button
722 * index, just report it
723 */
724 input_event(inputdev, EV_MSC, MSC_SERIAL, val);
725 }
726 break;
727
728 case 7:
729 /* Menu blocks */
730 input_event(inputdev, EV_MSC, MSC_SCAN,
731 device->buffer[1]);
732 break;
733 }
734 }
735
736 /* Other pid class */
737 if (inputdev->id.product == PID_400 ||
738 inputdev->id.product == PID_401) {
739
740 /* Report 2 */
741 if (device->buffer[0] == 2) {
742 /* Menu blocks */
743 input_event(inputdev, EV_MSC, MSC_SCAN, device->buffer[1]);
744 }
745
746 /* Report 1 */
747 if (device->buffer[0] == 1) {
748 char buttonbyte;
749
750 /* IF X max > 64K, we still a bit from the y report */
751 if (device->max_X > 0x10000) {
752
753 val = (u16)(((u16)(device->buffer[2] << 8)) | (u8)device->buffer[1]);
754 val |= (u32)(((u8)device->buffer[3] & 0x1) << 16);
755
756 input_report_abs(inputdev, ABS_X, val);
757
758 le_buffer[0] = (u8)((u8)(device->buffer[3]) >> 1);
759 le_buffer[0] |= (u8)((device->buffer[3] & 0x1) << 7);
760
761 le_buffer[1] = (u8)(device->buffer[4] >> 1);
762 le_buffer[1] |= (u8)((device->buffer[5] & 0x1) << 7);
763
764 val = get_unaligned_le16(le_buffer);
765 input_report_abs(inputdev, ABS_Y, val);
766
767 /*
768 * Shift the button byte right by one to
769 * make it look like the standard report
770 */
771 buttonbyte = device->buffer[5] >> 1;
772 } else {
773
774 val = get_unaligned_le16(&device->buffer[1]);
775 input_report_abs(inputdev, ABS_X, val);
776
777 val = get_unaligned_le16(&device->buffer[3]);
778 input_report_abs(inputdev, ABS_Y, val);
779
780 buttonbyte = device->buffer[5];
781 }
782
783 /* BUTTONS and PROXIMITY */
784 val = buttonbyte & MASK_INRANGE ? 1 : 0;
785 input_report_abs(inputdev, ABS_DISTANCE, val);
786
787 /* Convert buttons, only 4 bits possible */
788 val = buttonbyte & 0x0F;
789#ifdef USE_BUTTONS
790 for (i = 0; i < 5; i++)
791 input_report_key(inputdev, BTN_DIGI + i, val & (1 << i));
792#else
793 /* We don't apply any meaning to the bitmask, just report */
794 input_event(inputdev, EV_MSC, MSC_SERIAL, val);
795#endif
796
797 /* TRANSDUCER */
798 input_report_abs(inputdev, ABS_MISC, device->buffer[6]);
799 }
800 }
801
802 /* Everybody gets report ID's */
803 input_event(inputdev, EV_MSC, MSC_RAW, device->buffer[0]);
804
805 /* Sync it up */
806 input_sync(inputdev);
807
808 resubmit:
809 rc = usb_submit_urb(urbinfo, GFP_ATOMIC);
810 if (rc != 0)
811 err("usb_submit_urb failed rc=0x%x", rc);
812}
813
814/*
815 * The probe routine. This is called when the kernel find the matching USB
816 * vendor/product. We do the following:
817 *
818 * - Allocate mem for a local structure to manage the device
819 * - Request a HID Report Descriptor from the device and parse it to
820 * find out the device parameters
821 * - Create an input device and assign it attributes
822 * - Allocate an URB so the device can talk to us when the input
823 * queue is open
824 */
825static int gtco_probe(struct usb_interface *usbinterface,
826 const struct usb_device_id *id)
827{
828
829 struct gtco *gtco;
830 struct input_dev *input_dev;
831 struct hid_descriptor *hid_desc;
832 char *report;
833 int result = 0, retry;
834 int error;
835 struct usb_endpoint_descriptor *endpoint;
836
837 /* Allocate memory for device structure */
838 gtco = kzalloc(sizeof(struct gtco), GFP_KERNEL);
839 input_dev = input_allocate_device();
840 if (!gtco || !input_dev) {
841 err("No more memory");
842 error = -ENOMEM;
843 goto err_free_devs;
844 }
845
846 /* Set pointer to the input device */
847 gtco->inputdevice = input_dev;
848
849 /* Save interface information */
850 gtco->usbdev = usb_get_dev(interface_to_usbdev(usbinterface));
851
852 /* Allocate some data for incoming reports */
853 gtco->buffer = usb_alloc_coherent(gtco->usbdev, REPORT_MAX_SIZE,
854 GFP_KERNEL, >co->buf_dma);
855 if (!gtco->buffer) {
856 err("No more memory for us buffers");
857 error = -ENOMEM;
858 goto err_free_devs;
859 }
860
861 /* Allocate URB for reports */
862 gtco->urbinfo = usb_alloc_urb(0, GFP_KERNEL);
863 if (!gtco->urbinfo) {
864 err("Failed to allocate URB");
865 error = -ENOMEM;
866 goto err_free_buf;
867 }
868
869 /*
870 * The endpoint is always altsetting 0, we know this since we know
871 * this device only has one interrupt endpoint
872 */
873 endpoint = &usbinterface->altsetting[0].endpoint[0].desc;
874
875 /* Some debug */
876 dbg("gtco # interfaces: %d", usbinterface->num_altsetting);
877 dbg("num endpoints: %d", usbinterface->cur_altsetting->desc.bNumEndpoints);
878 dbg("interface class: %d", usbinterface->cur_altsetting->desc.bInterfaceClass);
879 dbg("endpoint: attribute:0x%x type:0x%x", endpoint->bmAttributes, endpoint->bDescriptorType);
880 if (usb_endpoint_xfer_int(endpoint))
881 dbg("endpoint: we have interrupt endpoint\n");
882
883 dbg("endpoint extra len:%d ", usbinterface->altsetting[0].extralen);
884
885 /*
886 * Find the HID descriptor so we can find out the size of the
887 * HID report descriptor
888 */
889 if (usb_get_extra_descriptor(usbinterface->cur_altsetting,
890 HID_DEVICE_TYPE, &hid_desc) != 0){
891 err("Can't retrieve exta USB descriptor to get hid report descriptor length");
892 error = -EIO;
893 goto err_free_urb;
894 }
895
896 dbg("Extra descriptor success: type:%d len:%d",
897 hid_desc->bDescriptorType, hid_desc->wDescriptorLength);
898
899 report = kzalloc(le16_to_cpu(hid_desc->wDescriptorLength), GFP_KERNEL);
900 if (!report) {
901 err("No more memory for report");
902 error = -ENOMEM;
903 goto err_free_urb;
904 }
905
906 /* Couple of tries to get reply */
907 for (retry = 0; retry < 3; retry++) {
908 result = usb_control_msg(gtco->usbdev,
909 usb_rcvctrlpipe(gtco->usbdev, 0),
910 USB_REQ_GET_DESCRIPTOR,
911 USB_RECIP_INTERFACE | USB_DIR_IN,
912 REPORT_DEVICE_TYPE << 8,
913 0, /* interface */
914 report,
915 le16_to_cpu(hid_desc->wDescriptorLength),
916 5000); /* 5 secs */
917
918 dbg("usb_control_msg result: %d", result);
919 if (result == le16_to_cpu(hid_desc->wDescriptorLength)) {
920 parse_hid_report_descriptor(gtco, report, result);
921 break;
922 }
923 }
924
925 kfree(report);
926
927 /* If we didn't get the report, fail */
928 if (result != le16_to_cpu(hid_desc->wDescriptorLength)) {
929 err("Failed to get HID Report Descriptor of size: %d",
930 hid_desc->wDescriptorLength);
931 error = -EIO;
932 goto err_free_urb;
933 }
934
935 /* Create a device file node */
936 usb_make_path(gtco->usbdev, gtco->usbpath, sizeof(gtco->usbpath));
937 strlcat(gtco->usbpath, "/input0", sizeof(gtco->usbpath));
938
939 /* Set Input device functions */
940 input_dev->open = gtco_input_open;
941 input_dev->close = gtco_input_close;
942
943 /* Set input device information */
944 input_dev->name = "GTCO_CalComp";
945 input_dev->phys = gtco->usbpath;
946
947 input_set_drvdata(input_dev, gtco);
948
949 /* Now set up all the input device capabilities */
950 gtco_setup_caps(input_dev);
951
952 /* Set input device required ID information */
953 usb_to_input_id(gtco->usbdev, &input_dev->id);
954 input_dev->dev.parent = &usbinterface->dev;
955
956 /* Setup the URB, it will be posted later on open of input device */
957 endpoint = &usbinterface->altsetting[0].endpoint[0].desc;
958
959 usb_fill_int_urb(gtco->urbinfo,
960 gtco->usbdev,
961 usb_rcvintpipe(gtco->usbdev,
962 endpoint->bEndpointAddress),
963 gtco->buffer,
964 REPORT_MAX_SIZE,
965 gtco_urb_callback,
966 gtco,
967 endpoint->bInterval);
968
969 gtco->urbinfo->transfer_dma = gtco->buf_dma;
970 gtco->urbinfo->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
971
972 /* Save gtco pointer in USB interface gtco */
973 usb_set_intfdata(usbinterface, gtco);
974
975 /* All done, now register the input device */
976 error = input_register_device(input_dev);
977 if (error)
978 goto err_free_urb;
979
980 return 0;
981
982 err_free_urb:
983 usb_free_urb(gtco->urbinfo);
984 err_free_buf:
985 usb_free_coherent(gtco->usbdev, REPORT_MAX_SIZE,
986 gtco->buffer, gtco->buf_dma);
987 err_free_devs:
988 input_free_device(input_dev);
989 kfree(gtco);
990 return error;
991}
992
993/*
994 * This function is a standard USB function called when the USB device
995 * is disconnected. We will get rid of the URV, de-register the input
996 * device, and free up allocated memory
997 */
998static void gtco_disconnect(struct usb_interface *interface)
999{
1000 /* Grab private device ptr */
1001 struct gtco *gtco = usb_get_intfdata(interface);
1002
1003 /* Now reverse all the registration stuff */
1004 if (gtco) {
1005 input_unregister_device(gtco->inputdevice);
1006 usb_kill_urb(gtco->urbinfo);
1007 usb_free_urb(gtco->urbinfo);
1008 usb_free_coherent(gtco->usbdev, REPORT_MAX_SIZE,
1009 gtco->buffer, gtco->buf_dma);
1010 kfree(gtco);
1011 }
1012
1013 dev_info(&interface->dev, "gtco driver disconnected\n");
1014}
1015
1016/* STANDARD MODULE LOAD ROUTINES */
1017
1018static struct usb_driver gtco_driverinfo_table = {
1019 .name = "gtco",
1020 .id_table = gtco_usbid_table,
1021 .probe = gtco_probe,
1022 .disconnect = gtco_disconnect,
1023};
1024
1025/*
1026 * Register this module with the USB subsystem
1027 */
1028static int __init gtco_init(void)
1029{
1030 int error;
1031
1032 error = usb_register(>co_driverinfo_table);
1033 if (error) {
1034 err("usb_register() failed rc=0x%x", error);
1035 return error;
1036 }
1037
1038 printk("GTCO usb driver version: %s", GTCO_VERSION);
1039 return 0;
1040}
1041
1042/*
1043 * Deregister this module with the USB subsystem
1044 */
1045static void __exit gtco_exit(void)
1046{
1047 usb_deregister(>co_driverinfo_table);
1048}
1049
1050module_init(gtco_init);
1051module_exit(gtco_exit);
1052
1053MODULE_DESCRIPTION("GTCO digitizer USB driver");
1054MODULE_LICENSE("GPL");