blob: 8fae6d1414cca83bc7af2386b7db5dc4cbd3f27b [file] [log] [blame]
K. Y. Srinivasanb95f5bc2011-11-17 08:47:29 -08001/*
2 * Copyright (c) 2009, Citrix Systems, Inc.
3 * Copyright (c) 2010, Microsoft Corporation.
4 * Copyright (c) 2011, Novell Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 */
15#include <linux/init.h>
16#include <linux/module.h>
17#include <linux/device.h>
18#include <linux/completion.h>
19#include <linux/input.h>
20#include <linux/hid.h>
21#include <linux/hiddev.h>
22#include <linux/hyperv.h>
23
24
25struct hv_input_dev_info {
26 unsigned int size;
27 unsigned short vendor;
28 unsigned short product;
29 unsigned short version;
30 unsigned short reserved[11];
31};
32
33/* The maximum size of a synthetic input message. */
34#define SYNTHHID_MAX_INPUT_REPORT_SIZE 16
35
36/*
37 * Current version
38 *
39 * History:
40 * Beta, RC < 2008/1/22 1,0
41 * RC > 2008/1/22 2,0
42 */
43#define SYNTHHID_INPUT_VERSION_MAJOR 2
44#define SYNTHHID_INPUT_VERSION_MINOR 0
45#define SYNTHHID_INPUT_VERSION (SYNTHHID_INPUT_VERSION_MINOR | \
46 (SYNTHHID_INPUT_VERSION_MAJOR << 16))
47
48
49#pragma pack(push, 1)
50/*
51 * Message types in the synthetic input protocol
52 */
53enum synthhid_msg_type {
54 SYNTH_HID_PROTOCOL_REQUEST,
55 SYNTH_HID_PROTOCOL_RESPONSE,
56 SYNTH_HID_INITIAL_DEVICE_INFO,
57 SYNTH_HID_INITIAL_DEVICE_INFO_ACK,
58 SYNTH_HID_INPUT_REPORT,
59 SYNTH_HID_MAX
60};
61
62/*
63 * Basic message structures.
64 */
65struct synthhid_msg_hdr {
66 enum synthhid_msg_type type;
67 u32 size;
68};
69
70struct synthhid_msg {
71 struct synthhid_msg_hdr header;
72 char data[1]; /* Enclosed message */
73};
74
75union synthhid_version {
76 struct {
77 u16 minor_version;
78 u16 major_version;
79 };
80 u32 version;
81};
82
83/*
84 * Protocol messages
85 */
86struct synthhid_protocol_request {
87 struct synthhid_msg_hdr header;
88 union synthhid_version version_requested;
89};
90
91struct synthhid_protocol_response {
92 struct synthhid_msg_hdr header;
93 union synthhid_version version_requested;
94 unsigned char approved;
95};
96
97struct synthhid_device_info {
98 struct synthhid_msg_hdr header;
99 struct hv_input_dev_info hid_dev_info;
100 struct hid_descriptor hid_descriptor;
101};
102
103struct synthhid_device_info_ack {
104 struct synthhid_msg_hdr header;
105 unsigned char reserved;
106};
107
108struct synthhid_input_report {
109 struct synthhid_msg_hdr header;
110 char buffer[1];
111};
112
113#pragma pack(pop)
114
115#define INPUTVSC_SEND_RING_BUFFER_SIZE (10*PAGE_SIZE)
116#define INPUTVSC_RECV_RING_BUFFER_SIZE (10*PAGE_SIZE)
117
118
119enum pipe_prot_msg_type {
120 PIPE_MESSAGE_INVALID,
121 PIPE_MESSAGE_DATA,
122 PIPE_MESSAGE_MAXIMUM
123};
124
125
126struct pipe_prt_msg {
127 enum pipe_prot_msg_type type;
128 u32 size;
129 char data[1];
130};
131
132struct mousevsc_prt_msg {
133 enum pipe_prot_msg_type type;
134 u32 size;
135 union {
136 struct synthhid_protocol_request request;
137 struct synthhid_protocol_response response;
138 struct synthhid_device_info_ack ack;
139 };
140};
141
142/*
143 * Represents an mousevsc device
144 */
145struct mousevsc_dev {
146 struct hv_device *device;
147 bool init_complete;
148 bool connected;
149 struct mousevsc_prt_msg protocol_req;
150 struct mousevsc_prt_msg protocol_resp;
151 /* Synchronize the request/response if needed */
152 struct completion wait_event;
153 int dev_info_status;
154
155 struct hid_descriptor *hid_desc;
156 unsigned char *report_desc;
157 u32 report_desc_size;
158 struct hv_input_dev_info hid_dev_info;
159 struct hid_device *hid_device;
160};
161
162
163static struct mousevsc_dev *mousevsc_alloc_device(struct hv_device *device)
164{
165 struct mousevsc_dev *input_dev;
166
167 input_dev = kzalloc(sizeof(struct mousevsc_dev), GFP_KERNEL);
168
169 if (!input_dev)
170 return NULL;
171
172 input_dev->device = device;
173 hv_set_drvdata(device, input_dev);
174 init_completion(&input_dev->wait_event);
175 input_dev->init_complete = false;
176
177 return input_dev;
178}
179
180static void mousevsc_free_device(struct mousevsc_dev *device)
181{
182 kfree(device->hid_desc);
183 kfree(device->report_desc);
184 hv_set_drvdata(device->device, NULL);
185 kfree(device);
186}
187
188static void mousevsc_on_receive_device_info(struct mousevsc_dev *input_device,
189 struct synthhid_device_info *device_info)
190{
191 int ret = 0;
192 struct hid_descriptor *desc;
193 struct mousevsc_prt_msg ack;
194
195 input_device->dev_info_status = -ENOMEM;
196
197 input_device->hid_dev_info = device_info->hid_dev_info;
198 desc = &device_info->hid_descriptor;
199 if (desc->bLength == 0)
200 goto cleanup;
201
Thomas Meyera4a23f62013-06-01 11:40:31 +0200202 input_device->hid_desc = kmemdup(desc, desc->bLength, GFP_ATOMIC);
K. Y. Srinivasanb95f5bc2011-11-17 08:47:29 -0800203
204 if (!input_device->hid_desc)
205 goto cleanup;
206
K. Y. Srinivasanb95f5bc2011-11-17 08:47:29 -0800207 input_device->report_desc_size = desc->desc[0].wDescriptorLength;
208 if (input_device->report_desc_size == 0) {
209 input_device->dev_info_status = -EINVAL;
210 goto cleanup;
211 }
212
213 input_device->report_desc = kzalloc(input_device->report_desc_size,
214 GFP_ATOMIC);
215
216 if (!input_device->report_desc) {
217 input_device->dev_info_status = -ENOMEM;
218 goto cleanup;
219 }
220
221 memcpy(input_device->report_desc,
222 ((unsigned char *)desc) + desc->bLength,
223 desc->desc[0].wDescriptorLength);
224
225 /* Send the ack */
226 memset(&ack, 0, sizeof(struct mousevsc_prt_msg));
227
228 ack.type = PIPE_MESSAGE_DATA;
229 ack.size = sizeof(struct synthhid_device_info_ack);
230
231 ack.ack.header.type = SYNTH_HID_INITIAL_DEVICE_INFO_ACK;
232 ack.ack.header.size = 1;
233 ack.ack.reserved = 0;
234
235 ret = vmbus_sendpacket(input_device->device->channel,
236 &ack,
237 sizeof(struct pipe_prt_msg) - sizeof(unsigned char) +
238 sizeof(struct synthhid_device_info_ack),
239 (unsigned long)&ack,
240 VM_PKT_DATA_INBAND,
241 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
242
243 if (!ret)
244 input_device->dev_info_status = 0;
245
246cleanup:
247 complete(&input_device->wait_event);
248
249 return;
250}
251
252static void mousevsc_on_receive(struct hv_device *device,
253 struct vmpacket_descriptor *packet)
254{
255 struct pipe_prt_msg *pipe_msg;
256 struct synthhid_msg *hid_msg;
257 struct mousevsc_dev *input_dev = hv_get_drvdata(device);
258 struct synthhid_input_report *input_report;
259
260 pipe_msg = (struct pipe_prt_msg *)((unsigned long)packet +
261 (packet->offset8 << 3));
262
263 if (pipe_msg->type != PIPE_MESSAGE_DATA)
264 return;
265
266 hid_msg = (struct synthhid_msg *)pipe_msg->data;
267
268 switch (hid_msg->header.type) {
269 case SYNTH_HID_PROTOCOL_RESPONSE:
270 /*
271 * While it will be impossible for us to protect against
272 * malicious/buggy hypervisor/host, add a check here to
273 * ensure we don't corrupt memory.
274 */
275 if ((pipe_msg->size + sizeof(struct pipe_prt_msg)
276 - sizeof(unsigned char))
277 > sizeof(struct mousevsc_prt_msg)) {
278 WARN_ON(1);
279 break;
280 }
281
282 memcpy(&input_dev->protocol_resp, pipe_msg,
283 pipe_msg->size + sizeof(struct pipe_prt_msg) -
284 sizeof(unsigned char));
285 complete(&input_dev->wait_event);
286 break;
287
288 case SYNTH_HID_INITIAL_DEVICE_INFO:
289 WARN_ON(pipe_msg->size < sizeof(struct hv_input_dev_info));
290
291 /*
292 * Parse out the device info into device attr,
293 * hid desc and report desc
294 */
295 mousevsc_on_receive_device_info(input_dev,
296 (struct synthhid_device_info *)pipe_msg->data);
297 break;
298 case SYNTH_HID_INPUT_REPORT:
299 input_report =
300 (struct synthhid_input_report *)pipe_msg->data;
301 if (!input_dev->init_complete)
302 break;
303 hid_input_report(input_dev->hid_device,
304 HID_INPUT_REPORT, input_report->buffer,
305 input_report->header.size, 1);
306 break;
307 default:
308 pr_err("unsupported hid msg type - type %d len %d",
309 hid_msg->header.type, hid_msg->header.size);
310 break;
311 }
312
313}
314
315static void mousevsc_on_channel_callback(void *context)
316{
317 const int packet_size = 0x100;
318 int ret;
319 struct hv_device *device = context;
320 u32 bytes_recvd;
321 u64 req_id;
322 struct vmpacket_descriptor *desc;
323 unsigned char *buffer;
324 int bufferlen = packet_size;
325
326 buffer = kmalloc(bufferlen, GFP_ATOMIC);
327 if (!buffer)
328 return;
329
330 do {
331 ret = vmbus_recvpacket_raw(device->channel, buffer,
332 bufferlen, &bytes_recvd, &req_id);
333
334 switch (ret) {
335 case 0:
336 if (bytes_recvd <= 0) {
337 kfree(buffer);
338 return;
339 }
340 desc = (struct vmpacket_descriptor *)buffer;
341
342 switch (desc->type) {
343 case VM_PKT_COMP:
344 break;
345
346 case VM_PKT_DATA_INBAND:
347 mousevsc_on_receive(device, desc);
348 break;
349
350 default:
351 pr_err("unhandled packet type %d, tid %llx len %d\n",
352 desc->type, req_id, bytes_recvd);
353 break;
354 }
355
356 break;
357
358 case -ENOBUFS:
359 kfree(buffer);
360 /* Handle large packet */
361 bufferlen = bytes_recvd;
362 buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
363
364 if (!buffer)
365 return;
366
367 break;
368 }
369 } while (1);
370
371}
372
373static int mousevsc_connect_to_vsp(struct hv_device *device)
374{
375 int ret = 0;
376 int t;
377 struct mousevsc_dev *input_dev = hv_get_drvdata(device);
378 struct mousevsc_prt_msg *request;
379 struct mousevsc_prt_msg *response;
380
381 request = &input_dev->protocol_req;
382 memset(request, 0, sizeof(struct mousevsc_prt_msg));
383
384 request->type = PIPE_MESSAGE_DATA;
385 request->size = sizeof(struct synthhid_protocol_request);
386 request->request.header.type = SYNTH_HID_PROTOCOL_REQUEST;
387 request->request.header.size = sizeof(unsigned int);
388 request->request.version_requested.version = SYNTHHID_INPUT_VERSION;
389
390 ret = vmbus_sendpacket(device->channel, request,
391 sizeof(struct pipe_prt_msg) -
392 sizeof(unsigned char) +
393 sizeof(struct synthhid_protocol_request),
394 (unsigned long)request,
395 VM_PKT_DATA_INBAND,
396 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
397 if (ret)
398 goto cleanup;
399
400 t = wait_for_completion_timeout(&input_dev->wait_event, 5*HZ);
401 if (!t) {
402 ret = -ETIMEDOUT;
403 goto cleanup;
404 }
405
406 response = &input_dev->protocol_resp;
407
408 if (!response->response.approved) {
409 pr_err("synthhid protocol request failed (version %d)\n",
410 SYNTHHID_INPUT_VERSION);
411 ret = -ENODEV;
412 goto cleanup;
413 }
414
415 t = wait_for_completion_timeout(&input_dev->wait_event, 5*HZ);
416 if (!t) {
417 ret = -ETIMEDOUT;
418 goto cleanup;
419 }
420
421 /*
422 * We should have gotten the device attr, hid desc and report
423 * desc at this point
424 */
425 ret = input_dev->dev_info_status;
426
427cleanup:
428 return ret;
429}
430
Henrik Rydberg07d9ab42012-04-22 14:21:38 +0200431static int mousevsc_hid_parse(struct hid_device *hid)
432{
433 struct hv_device *dev = hid_get_drvdata(hid);
434 struct mousevsc_dev *input_dev = hv_get_drvdata(dev);
435
436 return hid_parse_report(hid, input_dev->report_desc,
437 input_dev->report_desc_size);
438}
439
K. Y. Srinivasanb95f5bc2011-11-17 08:47:29 -0800440static int mousevsc_hid_open(struct hid_device *hid)
441{
442 return 0;
443}
444
445static int mousevsc_hid_start(struct hid_device *hid)
446{
447 return 0;
448}
449
450static void mousevsc_hid_close(struct hid_device *hid)
451{
452}
453
454static void mousevsc_hid_stop(struct hid_device *hid)
455{
456}
457
458static struct hid_ll_driver mousevsc_ll_driver = {
Henrik Rydberg07d9ab42012-04-22 14:21:38 +0200459 .parse = mousevsc_hid_parse,
K. Y. Srinivasanb95f5bc2011-11-17 08:47:29 -0800460 .open = mousevsc_hid_open,
461 .close = mousevsc_hid_close,
462 .start = mousevsc_hid_start,
463 .stop = mousevsc_hid_stop,
464};
465
466static struct hid_driver mousevsc_hid_driver;
467
468static int mousevsc_probe(struct hv_device *device,
469 const struct hv_vmbus_device_id *dev_id)
470{
471 int ret;
472 struct mousevsc_dev *input_dev;
473 struct hid_device *hid_dev;
474
475 input_dev = mousevsc_alloc_device(device);
476
477 if (!input_dev)
478 return -ENOMEM;
479
480 ret = vmbus_open(device->channel,
481 INPUTVSC_SEND_RING_BUFFER_SIZE,
482 INPUTVSC_RECV_RING_BUFFER_SIZE,
483 NULL,
484 0,
485 mousevsc_on_channel_callback,
486 device
487 );
488
489 if (ret)
490 goto probe_err0;
491
492 ret = mousevsc_connect_to_vsp(device);
493
494 if (ret)
495 goto probe_err1;
496
497 /* workaround SA-167 */
498 if (input_dev->report_desc[14] == 0x25)
499 input_dev->report_desc[14] = 0x29;
500
501 hid_dev = hid_allocate_device();
502 if (IS_ERR(hid_dev)) {
503 ret = PTR_ERR(hid_dev);
504 goto probe_err1;
505 }
506
507 hid_dev->ll_driver = &mousevsc_ll_driver;
508 hid_dev->driver = &mousevsc_hid_driver;
509 hid_dev->bus = BUS_VIRTUAL;
510 hid_dev->vendor = input_dev->hid_dev_info.vendor;
511 hid_dev->product = input_dev->hid_dev_info.product;
512 hid_dev->version = input_dev->hid_dev_info.version;
513 input_dev->hid_device = hid_dev;
514
515 sprintf(hid_dev->name, "%s", "Microsoft Vmbus HID-compliant Mouse");
516
K. Y. Srinivasanb565a392012-05-16 13:50:13 -0700517 hid_set_drvdata(hid_dev, device);
518
K. Y. Srinivasan74c4fb02011-11-30 08:52:23 -0800519 ret = hid_add_device(hid_dev);
520 if (ret)
521 goto probe_err1;
522
K. Y. Srinivasanb95f5bc2011-11-17 08:47:29 -0800523
Henrik Rydberg07d9ab42012-04-22 14:21:38 +0200524 ret = hid_parse(hid_dev);
K. Y. Srinivasanb95f5bc2011-11-17 08:47:29 -0800525 if (ret) {
526 hid_err(hid_dev, "parse failed\n");
527 goto probe_err2;
528 }
529
530 ret = hid_hw_start(hid_dev, HID_CONNECT_HIDINPUT | HID_CONNECT_HIDDEV);
531
532 if (ret) {
533 hid_err(hid_dev, "hw start failed\n");
534 goto probe_err2;
535 }
536
537 input_dev->connected = true;
538 input_dev->init_complete = true;
539
540 return ret;
541
542probe_err2:
543 hid_destroy_device(hid_dev);
544
545probe_err1:
546 vmbus_close(device->channel);
547
548probe_err0:
549 mousevsc_free_device(input_dev);
550
551 return ret;
552}
553
554
555static int mousevsc_remove(struct hv_device *dev)
556{
557 struct mousevsc_dev *input_dev = hv_get_drvdata(dev);
558
559 vmbus_close(dev->channel);
K. Y. Srinivasanc1c454b2012-01-18 08:57:14 -0800560 hid_hw_stop(input_dev->hid_device);
K. Y. Srinivasanb95f5bc2011-11-17 08:47:29 -0800561 hid_destroy_device(input_dev->hid_device);
562 mousevsc_free_device(input_dev);
563
564 return 0;
565}
566
567static const struct hv_vmbus_device_id id_table[] = {
568 /* Mouse guid */
K. Y. Srinivasan048c5add2013-01-23 17:42:44 -0800569 { HV_MOUSE_GUID, },
K. Y. Srinivasanb95f5bc2011-11-17 08:47:29 -0800570 { },
571};
572
573MODULE_DEVICE_TABLE(vmbus, id_table);
574
575static struct hv_driver mousevsc_drv = {
576 .name = KBUILD_MODNAME,
577 .id_table = id_table,
578 .probe = mousevsc_probe,
579 .remove = mousevsc_remove,
580};
581
582static int __init mousevsc_init(void)
583{
584 return vmbus_driver_register(&mousevsc_drv);
585}
586
587static void __exit mousevsc_exit(void)
588{
589 vmbus_driver_unregister(&mousevsc_drv);
590}
591
592MODULE_LICENSE("GPL");
K. Y. Srinivasanb95f5bc2011-11-17 08:47:29 -0800593module_init(mousevsc_init);
594module_exit(mousevsc_exit);