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1/*
2 * drivers/input/tablet/wacom_sys.c
3 *
4 * USB Wacom tablet support - system specific code
5 */
6
7/*
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14#include "wacom_wac.h"
15#include "wacom.h"
16
17/* defines to get HID report descriptor */
18#define HID_DEVICET_HID (USB_TYPE_CLASS | 0x01)
19#define HID_DEVICET_REPORT (USB_TYPE_CLASS | 0x02)
20#define HID_USAGE_UNDEFINED 0x00
21#define HID_USAGE_PAGE 0x05
22#define HID_USAGE_PAGE_DIGITIZER 0x0d
23#define HID_USAGE_PAGE_DESKTOP 0x01
24#define HID_USAGE 0x09
25#define HID_USAGE_X 0x30
26#define HID_USAGE_Y 0x31
27#define HID_USAGE_X_TILT 0x3d
28#define HID_USAGE_Y_TILT 0x3e
29#define HID_USAGE_FINGER 0x22
30#define HID_USAGE_STYLUS 0x20
31#define HID_COLLECTION 0xc0
32
33enum {
34 WCM_UNDEFINED = 0,
35 WCM_DESKTOP,
36 WCM_DIGITIZER,
37};
38
39struct hid_descriptor {
40 struct usb_descriptor_header header;
41 __le16 bcdHID;
42 u8 bCountryCode;
43 u8 bNumDescriptors;
44 u8 bDescriptorType;
45 __le16 wDescriptorLength;
46} __attribute__ ((packed));
47
48/* defines to get/set USB message */
49#define USB_REQ_GET_REPORT 0x01
50#define USB_REQ_SET_REPORT 0x09
51#define WAC_HID_FEATURE_REPORT 0x03
52#define WAC_MSG_RETRIES 5
53
54static int usb_get_report(struct usb_interface *intf, unsigned char type,
55 unsigned char id, void *buf, int size)
56{
57 return usb_control_msg(interface_to_usbdev(intf),
58 usb_rcvctrlpipe(interface_to_usbdev(intf), 0),
59 USB_REQ_GET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
60 (type << 8) + id, intf->altsetting[0].desc.bInterfaceNumber,
61 buf, size, 100);
62}
63
64static int usb_set_report(struct usb_interface *intf, unsigned char type,
65 unsigned char id, void *buf, int size)
66{
67 return usb_control_msg(interface_to_usbdev(intf),
68 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
69 USB_REQ_SET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
70 (type << 8) + id, intf->altsetting[0].desc.bInterfaceNumber,
71 buf, size, 1000);
72}
73
74static void wacom_sys_irq(struct urb *urb)
75{
76 struct wacom *wacom = urb->context;
77 int retval;
78
79 switch (urb->status) {
80 case 0:
81 /* success */
82 break;
83 case -ECONNRESET:
84 case -ENOENT:
85 case -ESHUTDOWN:
86 /* this urb is terminated, clean up */
87 dbg("%s - urb shutting down with status: %d", __func__, urb->status);
88 return;
89 default:
90 dbg("%s - nonzero urb status received: %d", __func__, urb->status);
91 goto exit;
92 }
93
94 wacom_wac_irq(&wacom->wacom_wac, urb->actual_length);
95
96 exit:
97 usb_mark_last_busy(wacom->usbdev);
98 retval = usb_submit_urb(urb, GFP_ATOMIC);
99 if (retval)
100 err ("%s - usb_submit_urb failed with result %d",
101 __func__, retval);
102}
103
104static int wacom_open(struct input_dev *dev)
105{
106 struct wacom *wacom = input_get_drvdata(dev);
107 int retval = 0;
108
109 if (usb_autopm_get_interface(wacom->intf) < 0)
110 return -EIO;
111
112 mutex_lock(&wacom->lock);
113
114 if (usb_submit_urb(wacom->irq, GFP_KERNEL)) {
115 retval = -EIO;
116 goto out;
117 }
118
119 wacom->open = true;
120 wacom->intf->needs_remote_wakeup = 1;
121
122out:
123 mutex_unlock(&wacom->lock);
124 usb_autopm_put_interface(wacom->intf);
125 return retval;
126}
127
128static void wacom_close(struct input_dev *dev)
129{
130 struct wacom *wacom = input_get_drvdata(dev);
131 int autopm_error;
132
133 autopm_error = usb_autopm_get_interface(wacom->intf);
134
135 mutex_lock(&wacom->lock);
136 usb_kill_urb(wacom->irq);
137 wacom->open = false;
138 wacom->intf->needs_remote_wakeup = 0;
139 mutex_unlock(&wacom->lock);
140
141 if (!autopm_error)
142 usb_autopm_put_interface(wacom->intf);
143}
144
145static int wacom_parse_hid(struct usb_interface *intf, struct hid_descriptor *hid_desc,
146 struct wacom_features *features)
147{
148 struct usb_device *dev = interface_to_usbdev(intf);
149 char limit = 0;
150 /* result has to be defined as int for some devices */
151 int result = 0;
152 int i = 0, usage = WCM_UNDEFINED, finger = 0, pen = 0;
153 unsigned char *report;
154
155 report = kzalloc(hid_desc->wDescriptorLength, GFP_KERNEL);
156 if (!report)
157 return -ENOMEM;
158
159 /* retrive report descriptors */
160 do {
161 result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
162 USB_REQ_GET_DESCRIPTOR,
163 USB_RECIP_INTERFACE | USB_DIR_IN,
164 HID_DEVICET_REPORT << 8,
165 intf->altsetting[0].desc.bInterfaceNumber, /* interface */
166 report,
167 hid_desc->wDescriptorLength,
168 5000); /* 5 secs */
169 } while (result < 0 && limit++ < WAC_MSG_RETRIES);
170
171 /* No need to parse the Descriptor. It isn't an error though */
172 if (result < 0)
173 goto out;
174
175 for (i = 0; i < hid_desc->wDescriptorLength; i++) {
176
177 switch (report[i]) {
178 case HID_USAGE_PAGE:
179 switch (report[i + 1]) {
180 case HID_USAGE_PAGE_DIGITIZER:
181 usage = WCM_DIGITIZER;
182 i++;
183 break;
184
185 case HID_USAGE_PAGE_DESKTOP:
186 usage = WCM_DESKTOP;
187 i++;
188 break;
189 }
190 break;
191
192 case HID_USAGE:
193 switch (report[i + 1]) {
194 case HID_USAGE_X:
195 if (usage == WCM_DESKTOP) {
196 if (finger) {
197 features->device_type = BTN_TOOL_FINGER;
198 if (features->type == TABLETPC2FG) {
199 /* need to reset back */
200 features->pktlen = WACOM_PKGLEN_TPC2FG;
201 features->device_type = BTN_TOOL_DOUBLETAP;
202 }
203 if (features->type == BAMBOO_PT) {
204 /* need to reset back */
205 features->pktlen = WACOM_PKGLEN_BBTOUCH;
206 features->device_type = BTN_TOOL_DOUBLETAP;
207 features->x_phy =
208 get_unaligned_le16(&report[i + 5]);
209 features->x_max =
210 get_unaligned_le16(&report[i + 8]);
211 i += 15;
212 } else {
213 features->x_max =
214 get_unaligned_le16(&report[i + 3]);
215 features->x_phy =
216 get_unaligned_le16(&report[i + 6]);
217 features->unit = report[i + 9];
218 features->unitExpo = report[i + 11];
219 i += 12;
220 }
221 } else if (pen) {
222 /* penabled only accepts exact bytes of data */
223 if (features->type == TABLETPC2FG)
224 features->pktlen = WACOM_PKGLEN_GRAPHIRE;
225 if (features->type == BAMBOO_PT)
226 features->pktlen = WACOM_PKGLEN_BBFUN;
227 features->device_type = BTN_TOOL_PEN;
228 features->x_max =
229 get_unaligned_le16(&report[i + 3]);
230 i += 4;
231 }
232 }
233 break;
234
235 case HID_USAGE_Y:
236 if (usage == WCM_DESKTOP) {
237 if (finger) {
238 features->device_type = BTN_TOOL_FINGER;
239 if (features->type == TABLETPC2FG) {
240 /* need to reset back */
241 features->pktlen = WACOM_PKGLEN_TPC2FG;
242 features->device_type = BTN_TOOL_DOUBLETAP;
243 features->y_max =
244 get_unaligned_le16(&report[i + 3]);
245 features->y_phy =
246 get_unaligned_le16(&report[i + 6]);
247 i += 7;
248 } else if (features->type == BAMBOO_PT) {
249 /* need to reset back */
250 features->pktlen = WACOM_PKGLEN_BBTOUCH;
251 features->device_type = BTN_TOOL_DOUBLETAP;
252 features->y_phy =
253 get_unaligned_le16(&report[i + 3]);
254 features->y_max =
255 get_unaligned_le16(&report[i + 6]);
256 i += 12;
257 } else {
258 features->y_max =
259 features->x_max;
260 features->y_phy =
261 get_unaligned_le16(&report[i + 3]);
262 i += 4;
263 }
264 } else if (pen) {
265 /* penabled only accepts exact bytes of data */
266 if (features->type == TABLETPC2FG)
267 features->pktlen = WACOM_PKGLEN_GRAPHIRE;
268 if (features->type == BAMBOO_PT)
269 features->pktlen = WACOM_PKGLEN_BBFUN;
270 features->device_type = BTN_TOOL_PEN;
271 features->y_max =
272 get_unaligned_le16(&report[i + 3]);
273 i += 4;
274 }
275 }
276 break;
277
278 case HID_USAGE_FINGER:
279 finger = 1;
280 i++;
281 break;
282
283 case HID_USAGE_STYLUS:
284 pen = 1;
285 i++;
286 break;
287 }
288 break;
289
290 case HID_COLLECTION:
291 /* reset UsagePage and Finger */
292 finger = usage = 0;
293 break;
294 }
295 }
296
297 out:
298 result = 0;
299 kfree(report);
300 return result;
301}
302
303static int wacom_query_tablet_data(struct usb_interface *intf, struct wacom_features *features)
304{
305 unsigned char *rep_data;
306 int limit = 0, report_id = 2;
307 int error = -ENOMEM;
308
309 rep_data = kmalloc(4, GFP_KERNEL);
310 if (!rep_data)
311 return error;
312
313 /* ask to report tablet data if it is MT Tablet PC or
314 * not a Tablet PC */
315 if (features->type == TABLETPC2FG) {
316 do {
317 rep_data[0] = 3;
318 rep_data[1] = 4;
319 rep_data[2] = 0;
320 rep_data[3] = 0;
321 report_id = 3;
322 error = usb_set_report(intf, WAC_HID_FEATURE_REPORT,
323 report_id, rep_data, 4);
324 if (error >= 0)
325 error = usb_get_report(intf,
326 WAC_HID_FEATURE_REPORT, report_id,
327 rep_data, 4);
328 } while ((error < 0 || rep_data[1] != 4) && limit++ < WAC_MSG_RETRIES);
329 } else if (features->type != TABLETPC) {
330 do {
331 rep_data[0] = 2;
332 rep_data[1] = 2;
333 error = usb_set_report(intf, WAC_HID_FEATURE_REPORT,
334 report_id, rep_data, 2);
335 if (error >= 0)
336 error = usb_get_report(intf,
337 WAC_HID_FEATURE_REPORT, report_id,
338 rep_data, 2);
339 } while ((error < 0 || rep_data[1] != 2) && limit++ < WAC_MSG_RETRIES);
340 }
341
342 kfree(rep_data);
343
344 return error < 0 ? error : 0;
345}
346
347static int wacom_retrieve_hid_descriptor(struct usb_interface *intf,
348 struct wacom_features *features)
349{
350 int error = 0;
351 struct usb_host_interface *interface = intf->cur_altsetting;
352 struct hid_descriptor *hid_desc;
353
354 /* default features */
355 features->device_type = BTN_TOOL_PEN;
356 features->x_fuzz = 4;
357 features->y_fuzz = 4;
358 features->pressure_fuzz = 0;
359 features->distance_fuzz = 0;
360
361 /* only Tablet PCs and Bamboo P&T need to retrieve the info */
362 if ((features->type != TABLETPC) && (features->type != TABLETPC2FG) &&
363 (features->type != BAMBOO_PT))
364 goto out;
365
366 if (usb_get_extra_descriptor(interface, HID_DEVICET_HID, &hid_desc)) {
367 if (usb_get_extra_descriptor(&interface->endpoint[0],
368 HID_DEVICET_REPORT, &hid_desc)) {
369 printk("wacom: can not retrieve extra class descriptor\n");
370 error = 1;
371 goto out;
372 }
373 }
374 error = wacom_parse_hid(intf, hid_desc, features);
375 if (error)
376 goto out;
377
378 out:
379 return error;
380}
381
382struct wacom_usbdev_data {
383 struct list_head list;
384 struct kref kref;
385 struct usb_device *dev;
386 struct wacom_shared shared;
387};
388
389static LIST_HEAD(wacom_udev_list);
390static DEFINE_MUTEX(wacom_udev_list_lock);
391
392static struct wacom_usbdev_data *wacom_get_usbdev_data(struct usb_device *dev)
393{
394 struct wacom_usbdev_data *data;
395
396 list_for_each_entry(data, &wacom_udev_list, list) {
397 if (data->dev == dev) {
398 kref_get(&data->kref);
399 return data;
400 }
401 }
402
403 return NULL;
404}
405
406static int wacom_add_shared_data(struct wacom_wac *wacom,
407 struct usb_device *dev)
408{
409 struct wacom_usbdev_data *data;
410 int retval = 0;
411
412 mutex_lock(&wacom_udev_list_lock);
413
414 data = wacom_get_usbdev_data(dev);
415 if (!data) {
416 data = kzalloc(sizeof(struct wacom_usbdev_data), GFP_KERNEL);
417 if (!data) {
418 retval = -ENOMEM;
419 goto out;
420 }
421
422 kref_init(&data->kref);
423 data->dev = dev;
424 list_add_tail(&data->list, &wacom_udev_list);
425 }
426
427 wacom->shared = &data->shared;
428
429out:
430 mutex_unlock(&wacom_udev_list_lock);
431 return retval;
432}
433
434static void wacom_release_shared_data(struct kref *kref)
435{
436 struct wacom_usbdev_data *data =
437 container_of(kref, struct wacom_usbdev_data, kref);
438
439 mutex_lock(&wacom_udev_list_lock);
440 list_del(&data->list);
441 mutex_unlock(&wacom_udev_list_lock);
442
443 kfree(data);
444}
445
446static void wacom_remove_shared_data(struct wacom_wac *wacom)
447{
448 struct wacom_usbdev_data *data;
449
450 if (wacom->shared) {
451 data = container_of(wacom->shared, struct wacom_usbdev_data, shared);
452 kref_put(&data->kref, wacom_release_shared_data);
453 wacom->shared = NULL;
454 }
455}
456
457static int wacom_probe(struct usb_interface *intf, const struct usb_device_id *id)
458{
459 struct usb_device *dev = interface_to_usbdev(intf);
460 struct usb_endpoint_descriptor *endpoint;
461 struct wacom *wacom;
462 struct wacom_wac *wacom_wac;
463 struct wacom_features *features;
464 struct input_dev *input_dev;
465 int error;
466
467 if (!id->driver_info)
468 return -EINVAL;
469
470 wacom = kzalloc(sizeof(struct wacom), GFP_KERNEL);
471 input_dev = input_allocate_device();
472 if (!wacom || !input_dev) {
473 error = -ENOMEM;
474 goto fail1;
475 }
476
477 wacom_wac = &wacom->wacom_wac;
478 wacom_wac->features = *((struct wacom_features *)id->driver_info);
479 features = &wacom_wac->features;
480 if (features->pktlen > WACOM_PKGLEN_MAX) {
481 error = -EINVAL;
482 goto fail1;
483 }
484
485 wacom_wac->data = usb_alloc_coherent(dev, WACOM_PKGLEN_MAX,
486 GFP_KERNEL, &wacom->data_dma);
487 if (!wacom_wac->data) {
488 error = -ENOMEM;
489 goto fail1;
490 }
491
492 wacom->irq = usb_alloc_urb(0, GFP_KERNEL);
493 if (!wacom->irq) {
494 error = -ENOMEM;
495 goto fail2;
496 }
497
498 wacom->usbdev = dev;
499 wacom->intf = intf;
500 mutex_init(&wacom->lock);
501 usb_make_path(dev, wacom->phys, sizeof(wacom->phys));
502 strlcat(wacom->phys, "/input0", sizeof(wacom->phys));
503
504 wacom_wac->input = input_dev;
505
506 endpoint = &intf->cur_altsetting->endpoint[0].desc;
507
508 /* Retrieve the physical and logical size for OEM devices */
509 error = wacom_retrieve_hid_descriptor(intf, features);
510 if (error)
511 goto fail3;
512
513 wacom_setup_device_quirks(features);
514
515 strlcpy(wacom_wac->name, features->name, sizeof(wacom_wac->name));
516
517 if (features->quirks & WACOM_QUIRK_MULTI_INPUT) {
518 /* Append the device type to the name */
519 strlcat(wacom_wac->name,
520 features->device_type == BTN_TOOL_PEN ?
521 " Pen" : " Finger",
522 sizeof(wacom_wac->name));
523
524 error = wacom_add_shared_data(wacom_wac, dev);
525 if (error)
526 goto fail3;
527 }
528
529 input_dev->name = wacom_wac->name;
530 input_dev->dev.parent = &intf->dev;
531 input_dev->open = wacom_open;
532 input_dev->close = wacom_close;
533 usb_to_input_id(dev, &input_dev->id);
534 input_set_drvdata(input_dev, wacom);
535
536 wacom_setup_input_capabilities(input_dev, wacom_wac);
537
538 usb_fill_int_urb(wacom->irq, dev,
539 usb_rcvintpipe(dev, endpoint->bEndpointAddress),
540 wacom_wac->data, features->pktlen,
541 wacom_sys_irq, wacom, endpoint->bInterval);
542 wacom->irq->transfer_dma = wacom->data_dma;
543 wacom->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
544
545 error = input_register_device(input_dev);
546 if (error)
547 goto fail4;
548
549 /* Note that if query fails it is not a hard failure */
550 wacom_query_tablet_data(intf, features);
551
552 usb_set_intfdata(intf, wacom);
553 return 0;
554
555 fail4: wacom_remove_shared_data(wacom_wac);
556 fail3: usb_free_urb(wacom->irq);
557 fail2: usb_free_coherent(dev, WACOM_PKGLEN_MAX, wacom_wac->data, wacom->data_dma);
558 fail1: input_free_device(input_dev);
559 kfree(wacom);
560 return error;
561}
562
563static void wacom_disconnect(struct usb_interface *intf)
564{
565 struct wacom *wacom = usb_get_intfdata(intf);
566
567 usb_set_intfdata(intf, NULL);
568
569 usb_kill_urb(wacom->irq);
570 input_unregister_device(wacom->wacom_wac.input);
571 usb_free_urb(wacom->irq);
572 usb_free_coherent(interface_to_usbdev(intf), WACOM_PKGLEN_MAX,
573 wacom->wacom_wac.data, wacom->data_dma);
574 wacom_remove_shared_data(&wacom->wacom_wac);
575 kfree(wacom);
576}
577
578static int wacom_suspend(struct usb_interface *intf, pm_message_t message)
579{
580 struct wacom *wacom = usb_get_intfdata(intf);
581
582 mutex_lock(&wacom->lock);
583 usb_kill_urb(wacom->irq);
584 mutex_unlock(&wacom->lock);
585
586 return 0;
587}
588
589static int wacom_resume(struct usb_interface *intf)
590{
591 struct wacom *wacom = usb_get_intfdata(intf);
592 struct wacom_features *features = &wacom->wacom_wac.features;
593 int rv;
594
595 mutex_lock(&wacom->lock);
596
597 /* switch to wacom mode first */
598 wacom_query_tablet_data(intf, features);
599
600 if (wacom->open)
601 rv = usb_submit_urb(wacom->irq, GFP_NOIO);
602 else
603 rv = 0;
604
605 mutex_unlock(&wacom->lock);
606
607 return rv;
608}
609
610static int wacom_reset_resume(struct usb_interface *intf)
611{
612 return wacom_resume(intf);
613}
614
615static struct usb_driver wacom_driver = {
616 .name = "wacom",
617 .id_table = wacom_ids,
618 .probe = wacom_probe,
619 .disconnect = wacom_disconnect,
620 .suspend = wacom_suspend,
621 .resume = wacom_resume,
622 .reset_resume = wacom_reset_resume,
623 .supports_autosuspend = 1,
624};
625
626static int __init wacom_init(void)
627{
628 int result;
629
630 result = usb_register(&wacom_driver);
631 if (result == 0)
632 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
633 DRIVER_DESC "\n");
634 return result;
635}
636
637static void __exit wacom_exit(void)
638{
639 usb_deregister(&wacom_driver);
640}
641
642module_init(wacom_init);
643module_exit(wacom_exit);