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12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/hid.h>
15#include <linux/idr.h>
16#include <linux/cdev.h>
17#include <linux/mutex.h>
18#include <linux/poll.h>
19#include <linux/uaccess.h>
20#include <linux/wait.h>
21#include <linux/sched.h>
22#include <linux/usb/g_hid.h>
23
24#include "u_f.h"
25#include "u_hid.h"
26
27#define HIDG_MINORS 4
28
29static int major, minors;
30static struct class *hidg_class;
31static DEFINE_IDA(hidg_ida);
32static DEFINE_MUTEX(hidg_ida_lock);
33
34
35
36
37struct f_hidg_req_list {
38 struct usb_request *req;
39 unsigned int pos;
40 struct list_head list;
41};
42
43struct f_hidg {
44
45 unsigned char bInterfaceSubClass;
46 unsigned char bInterfaceProtocol;
47 unsigned short report_desc_length;
48 char *report_desc;
49 unsigned short report_length;
50
51
52 struct list_head completed_out_req;
53 spinlock_t read_spinlock;
54 wait_queue_head_t read_queue;
55 unsigned int qlen;
56
57
58 spinlock_t write_spinlock;
59 bool write_pending;
60 wait_queue_head_t write_queue;
61 struct usb_request *req;
62
63 int minor;
64 struct cdev cdev;
65 struct usb_function func;
66
67 struct usb_ep *in_ep;
68 struct usb_ep *out_ep;
69};
70
71static inline struct f_hidg *func_to_hidg(struct usb_function *f)
72{
73 return container_of(f, struct f_hidg, func);
74}
75
76
77
78
79static struct usb_interface_descriptor hidg_interface_desc = {
80 .bLength = sizeof hidg_interface_desc,
81 .bDescriptorType = USB_DT_INTERFACE,
82
83 .bAlternateSetting = 0,
84 .bNumEndpoints = 2,
85 .bInterfaceClass = USB_CLASS_HID,
86
87
88
89};
90
91static struct hid_descriptor hidg_desc = {
92 .bLength = sizeof hidg_desc,
93 .bDescriptorType = HID_DT_HID,
94 .bcdHID = 0x0101,
95 .bCountryCode = 0x00,
96 .bNumDescriptors = 0x1,
97
98
99};
100
101
102
103static struct usb_endpoint_descriptor hidg_ss_in_ep_desc = {
104 .bLength = USB_DT_ENDPOINT_SIZE,
105 .bDescriptorType = USB_DT_ENDPOINT,
106 .bEndpointAddress = USB_DIR_IN,
107 .bmAttributes = USB_ENDPOINT_XFER_INT,
108
109 .bInterval = 4,
110
111
112
113};
114
115static struct usb_ss_ep_comp_descriptor hidg_ss_in_comp_desc = {
116 .bLength = sizeof(hidg_ss_in_comp_desc),
117 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
118
119
120
121
122};
123
124static struct usb_endpoint_descriptor hidg_ss_out_ep_desc = {
125 .bLength = USB_DT_ENDPOINT_SIZE,
126 .bDescriptorType = USB_DT_ENDPOINT,
127 .bEndpointAddress = USB_DIR_OUT,
128 .bmAttributes = USB_ENDPOINT_XFER_INT,
129
130 .bInterval = 4,
131
132
133
134};
135
136static struct usb_ss_ep_comp_descriptor hidg_ss_out_comp_desc = {
137 .bLength = sizeof(hidg_ss_out_comp_desc),
138 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
139
140
141
142
143};
144
145static struct usb_descriptor_header *hidg_ss_descriptors[] = {
146 (struct usb_descriptor_header *)&hidg_interface_desc,
147 (struct usb_descriptor_header *)&hidg_desc,
148 (struct usb_descriptor_header *)&hidg_ss_in_ep_desc,
149 (struct usb_descriptor_header *)&hidg_ss_in_comp_desc,
150 (struct usb_descriptor_header *)&hidg_ss_out_ep_desc,
151 (struct usb_descriptor_header *)&hidg_ss_out_comp_desc,
152 NULL,
153};
154
155
156
157static struct usb_endpoint_descriptor hidg_hs_in_ep_desc = {
158 .bLength = USB_DT_ENDPOINT_SIZE,
159 .bDescriptorType = USB_DT_ENDPOINT,
160 .bEndpointAddress = USB_DIR_IN,
161 .bmAttributes = USB_ENDPOINT_XFER_INT,
162
163 .bInterval = 4,
164
165
166
167};
168
169static struct usb_endpoint_descriptor hidg_hs_out_ep_desc = {
170 .bLength = USB_DT_ENDPOINT_SIZE,
171 .bDescriptorType = USB_DT_ENDPOINT,
172 .bEndpointAddress = USB_DIR_OUT,
173 .bmAttributes = USB_ENDPOINT_XFER_INT,
174
175 .bInterval = 4,
176
177
178
179};
180
181static struct usb_descriptor_header *hidg_hs_descriptors[] = {
182 (struct usb_descriptor_header *)&hidg_interface_desc,
183 (struct usb_descriptor_header *)&hidg_desc,
184 (struct usb_descriptor_header *)&hidg_hs_in_ep_desc,
185 (struct usb_descriptor_header *)&hidg_hs_out_ep_desc,
186 NULL,
187};
188
189
190
191static struct usb_endpoint_descriptor hidg_fs_in_ep_desc = {
192 .bLength = USB_DT_ENDPOINT_SIZE,
193 .bDescriptorType = USB_DT_ENDPOINT,
194 .bEndpointAddress = USB_DIR_IN,
195 .bmAttributes = USB_ENDPOINT_XFER_INT,
196
197 .bInterval = 10,
198
199
200
201};
202
203static struct usb_endpoint_descriptor hidg_fs_out_ep_desc = {
204 .bLength = USB_DT_ENDPOINT_SIZE,
205 .bDescriptorType = USB_DT_ENDPOINT,
206 .bEndpointAddress = USB_DIR_OUT,
207 .bmAttributes = USB_ENDPOINT_XFER_INT,
208
209 .bInterval = 10,
210
211
212
213};
214
215static struct usb_descriptor_header *hidg_fs_descriptors[] = {
216 (struct usb_descriptor_header *)&hidg_interface_desc,
217 (struct usb_descriptor_header *)&hidg_desc,
218 (struct usb_descriptor_header *)&hidg_fs_in_ep_desc,
219 (struct usb_descriptor_header *)&hidg_fs_out_ep_desc,
220 NULL,
221};
222
223
224
225
226#define CT_FUNC_HID_IDX 0
227
228static struct usb_string ct_func_string_defs[] = {
229 [CT_FUNC_HID_IDX].s = "HID Interface",
230 {},
231};
232
233static struct usb_gadget_strings ct_func_string_table = {
234 .language = 0x0409,
235 .strings = ct_func_string_defs,
236};
237
238static struct usb_gadget_strings *ct_func_strings[] = {
239 &ct_func_string_table,
240 NULL,
241};
242
243
244
245
246static ssize_t f_hidg_read(struct file *file, char __user *buffer,
247 size_t count, loff_t *ptr)
248{
249 struct f_hidg *hidg = file->private_data;
250 struct f_hidg_req_list *list;
251 struct usb_request *req;
252 unsigned long flags;
253 int ret;
254
255 if (!count)
256 return 0;
257
258 if (!access_ok(VERIFY_WRITE, buffer, count))
259 return -EFAULT;
260
261 spin_lock_irqsave(&hidg->read_spinlock, flags);
262
263#define READ_COND (!list_empty(&hidg->completed_out_req))
264
265
266 while (!READ_COND) {
267 spin_unlock_irqrestore(&hidg->read_spinlock, flags);
268 if (file->f_flags & O_NONBLOCK)
269 return -EAGAIN;
270
271 if (wait_event_interruptible(hidg->read_queue, READ_COND))
272 return -ERESTARTSYS;
273
274 spin_lock_irqsave(&hidg->read_spinlock, flags);
275 }
276
277
278 list = list_first_entry(&hidg->completed_out_req,
279 struct f_hidg_req_list, list);
280
281
282
283
284
285 list_del(&list->list);
286
287 req = list->req;
288 count = min_t(unsigned int, count, req->actual - list->pos);
289 spin_unlock_irqrestore(&hidg->read_spinlock, flags);
290
291
292 count -= copy_to_user(buffer, req->buf + list->pos, count);
293 list->pos += count;
294
295
296
297
298
299
300
301 if (list->pos == req->actual) {
302 kfree(list);
303
304 req->length = hidg->report_length;
305 ret = usb_ep_queue(hidg->out_ep, req, GFP_KERNEL);
306 if (ret < 0) {
307 free_ep_req(hidg->out_ep, req);
308 return ret;
309 }
310 } else {
311 spin_lock_irqsave(&hidg->read_spinlock, flags);
312 list_add(&list->list, &hidg->completed_out_req);
313 spin_unlock_irqrestore(&hidg->read_spinlock, flags);
314
315 wake_up(&hidg->read_queue);
316 }
317
318 return count;
319}
320
321static void f_hidg_req_complete(struct usb_ep *ep, struct usb_request *req)
322{
323 struct f_hidg *hidg = (struct f_hidg *)ep->driver_data;
324 unsigned long flags;
325
326 if (req->status != 0) {
327 ERROR(hidg->func.config->cdev,
328 "End Point Request ERROR: %d\n", req->status);
329 }
330
331 spin_lock_irqsave(&hidg->write_spinlock, flags);
332 hidg->write_pending = 0;
333 spin_unlock_irqrestore(&hidg->write_spinlock, flags);
334 wake_up(&hidg->write_queue);
335}
336
337static ssize_t f_hidg_write(struct file *file, const char __user *buffer,
338 size_t count, loff_t *offp)
339{
340 struct f_hidg *hidg = file->private_data;
341 struct usb_request *req;
342 unsigned long flags;
343 ssize_t status = -ENOMEM;
344
345 if (!access_ok(VERIFY_READ, buffer, count))
346 return -EFAULT;
347
348 spin_lock_irqsave(&hidg->write_spinlock, flags);
349
350#define WRITE_COND (!hidg->write_pending)
351try_again:
352
353 while (!WRITE_COND) {
354 spin_unlock_irqrestore(&hidg->write_spinlock, flags);
355 if (file->f_flags & O_NONBLOCK)
356 return -EAGAIN;
357
358 if (wait_event_interruptible_exclusive(
359 hidg->write_queue, WRITE_COND))
360 return -ERESTARTSYS;
361
362 spin_lock_irqsave(&hidg->write_spinlock, flags);
363 }
364
365 hidg->write_pending = 1;
366 req = hidg->req;
367 count = min_t(unsigned, count, hidg->report_length);
368
369 spin_unlock_irqrestore(&hidg->write_spinlock, flags);
370 status = copy_from_user(req->buf, buffer, count);
371
372 if (status != 0) {
373 ERROR(hidg->func.config->cdev,
374 "copy_from_user error\n");
375 status = -EINVAL;
376 goto release_write_pending;
377 }
378
379 spin_lock_irqsave(&hidg->write_spinlock, flags);
380
381
382 if (!hidg->req) {
383 free_ep_req(hidg->in_ep, req);
384
385
386
387
388 goto try_again;
389 }
390
391 req->status = 0;
392 req->zero = 0;
393 req->length = count;
394 req->complete = f_hidg_req_complete;
395 req->context = hidg;
396
397 status = usb_ep_queue(hidg->in_ep, req, GFP_ATOMIC);
398 if (status < 0) {
399 ERROR(hidg->func.config->cdev,
400 "usb_ep_queue error on int endpoint %zd\n", status);
401 goto release_write_pending_unlocked;
402 } else {
403 status = count;
404 }
405 spin_unlock_irqrestore(&hidg->write_spinlock, flags);
406
407 return status;
408release_write_pending:
409 spin_lock_irqsave(&hidg->write_spinlock, flags);
410release_write_pending_unlocked:
411 hidg->write_pending = 0;
412 spin_unlock_irqrestore(&hidg->write_spinlock, flags);
413
414 wake_up(&hidg->write_queue);
415
416 return status;
417}
418
419static unsigned int f_hidg_poll(struct file *file, poll_table *wait)
420{
421 struct f_hidg *hidg = file->private_data;
422 unsigned int ret = 0;
423
424 poll_wait(file, &hidg->read_queue, wait);
425 poll_wait(file, &hidg->write_queue, wait);
426
427 if (WRITE_COND)
428 ret |= POLLOUT | POLLWRNORM;
429
430 if (READ_COND)
431 ret |= POLLIN | POLLRDNORM;
432
433 return ret;
434}
435
436#undef WRITE_COND
437#undef READ_COND
438
439static int f_hidg_release(struct inode *inode, struct file *fd)
440{
441 fd->private_data = NULL;
442 return 0;
443}
444
445static int f_hidg_open(struct inode *inode, struct file *fd)
446{
447 struct f_hidg *hidg =
448 container_of(inode->i_cdev, struct f_hidg, cdev);
449
450 fd->private_data = hidg;
451
452 return 0;
453}
454
455
456
457
458static inline struct usb_request *hidg_alloc_ep_req(struct usb_ep *ep,
459 unsigned length)
460{
461 return alloc_ep_req(ep, length);
462}
463
464static void hidg_set_report_complete(struct usb_ep *ep, struct usb_request *req)
465{
466 struct f_hidg *hidg = (struct f_hidg *) req->context;
467 struct usb_composite_dev *cdev = hidg->func.config->cdev;
468 struct f_hidg_req_list *req_list;
469 unsigned long flags;
470
471 switch (req->status) {
472 case 0:
473 req_list = kzalloc(sizeof(*req_list), GFP_ATOMIC);
474 if (!req_list) {
475 ERROR(cdev, "Unable to allocate mem for req_list\n");
476 goto free_req;
477 }
478
479 req_list->req = req;
480
481 spin_lock_irqsave(&hidg->read_spinlock, flags);
482 list_add_tail(&req_list->list, &hidg->completed_out_req);
483 spin_unlock_irqrestore(&hidg->read_spinlock, flags);
484
485 wake_up(&hidg->read_queue);
486 break;
487 default:
488 ERROR(cdev, "Set report failed %d\n", req->status);
489
490 case -ECONNABORTED:
491 case -ECONNRESET:
492 case -ESHUTDOWN:
493free_req:
494 free_ep_req(ep, req);
495 return;
496 }
497}
498
499static int hidg_setup(struct usb_function *f,
500 const struct usb_ctrlrequest *ctrl)
501{
502 struct f_hidg *hidg = func_to_hidg(f);
503 struct usb_composite_dev *cdev = f->config->cdev;
504 struct usb_request *req = cdev->req;
505 int status = 0;
506 __u16 value, length;
507
508 value = __le16_to_cpu(ctrl->wValue);
509 length = __le16_to_cpu(ctrl->wLength);
510
511 VDBG(cdev,
512 "%s crtl_request : bRequestType:0x%x bRequest:0x%x Value:0x%x\n",
513 __func__, ctrl->bRequestType, ctrl->bRequest, value);
514
515 switch ((ctrl->bRequestType << 8) | ctrl->bRequest) {
516 case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
517 | HID_REQ_GET_REPORT):
518 VDBG(cdev, "get_report\n");
519
520
521 length = min_t(unsigned, length, hidg->report_length);
522 memset(req->buf, 0x0, length);
523
524 goto respond;
525 break;
526
527 case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
528 | HID_REQ_GET_PROTOCOL):
529 VDBG(cdev, "get_protocol\n");
530 goto stall;
531 break;
532
533 case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
534 | HID_REQ_SET_REPORT):
535 VDBG(cdev, "set_report | wLength=%d\n", ctrl->wLength);
536 goto stall;
537 break;
538
539 case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
540 | HID_REQ_SET_PROTOCOL):
541 VDBG(cdev, "set_protocol\n");
542 goto stall;
543 break;
544
545 case ((USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_INTERFACE) << 8
546 | USB_REQ_GET_DESCRIPTOR):
547 switch (value >> 8) {
548 case HID_DT_HID:
549 {
550 struct hid_descriptor hidg_desc_copy = hidg_desc;
551
552 VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: HID\n");
553 hidg_desc_copy.desc[0].bDescriptorType = HID_DT_REPORT;
554 hidg_desc_copy.desc[0].wDescriptorLength =
555 cpu_to_le16(hidg->report_desc_length);
556
557 length = min_t(unsigned short, length,
558 hidg_desc_copy.bLength);
559 memcpy(req->buf, &hidg_desc_copy, length);
560 goto respond;
561 break;
562 }
563 case HID_DT_REPORT:
564 VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: REPORT\n");
565 length = min_t(unsigned short, length,
566 hidg->report_desc_length);
567 memcpy(req->buf, hidg->report_desc, length);
568 goto respond;
569 break;
570
571 default:
572 VDBG(cdev, "Unknown descriptor request 0x%x\n",
573 value >> 8);
574 goto stall;
575 break;
576 }
577 break;
578
579 default:
580 VDBG(cdev, "Unknown request 0x%x\n",
581 ctrl->bRequest);
582 goto stall;
583 break;
584 }
585
586stall:
587 return -EOPNOTSUPP;
588
589respond:
590 req->zero = 0;
591 req->length = length;
592 status = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
593 if (status < 0)
594 ERROR(cdev, "usb_ep_queue error on ep0 %d\n", value);
595 return status;
596}
597
598static void hidg_disable(struct usb_function *f)
599{
600 struct f_hidg *hidg = func_to_hidg(f);
601 struct f_hidg_req_list *list, *next;
602 unsigned long flags;
603
604 usb_ep_disable(hidg->in_ep);
605 usb_ep_disable(hidg->out_ep);
606
607 spin_lock_irqsave(&hidg->read_spinlock, flags);
608 list_for_each_entry_safe(list, next, &hidg->completed_out_req, list) {
609 free_ep_req(hidg->out_ep, list->req);
610 list_del(&list->list);
611 kfree(list);
612 }
613 spin_unlock_irqrestore(&hidg->read_spinlock, flags);
614
615 spin_lock_irqsave(&hidg->write_spinlock, flags);
616 if (!hidg->write_pending) {
617 free_ep_req(hidg->in_ep, hidg->req);
618 hidg->write_pending = 1;
619 }
620
621 hidg->req = NULL;
622 spin_unlock_irqrestore(&hidg->write_spinlock, flags);
623}
624
625static int hidg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
626{
627 struct usb_composite_dev *cdev = f->config->cdev;
628 struct f_hidg *hidg = func_to_hidg(f);
629 struct usb_request *req_in = NULL;
630 unsigned long flags;
631 int i, status = 0;
632
633 VDBG(cdev, "hidg_set_alt intf:%d alt:%d\n", intf, alt);
634
635 if (hidg->in_ep != NULL) {
636
637 usb_ep_disable(hidg->in_ep);
638
639 status = config_ep_by_speed(f->config->cdev->gadget, f,
640 hidg->in_ep);
641 if (status) {
642 ERROR(cdev, "config_ep_by_speed FAILED!\n");
643 goto fail;
644 }
645 status = usb_ep_enable(hidg->in_ep);
646 if (status < 0) {
647 ERROR(cdev, "Enable IN endpoint FAILED!\n");
648 goto fail;
649 }
650 hidg->in_ep->driver_data = hidg;
651
652 req_in = hidg_alloc_ep_req(hidg->in_ep, hidg->report_length);
653 if (!req_in) {
654 status = -ENOMEM;
655 goto disable_ep_in;
656 }
657 }
658
659
660 if (hidg->out_ep != NULL) {
661
662 usb_ep_disable(hidg->out_ep);
663
664 status = config_ep_by_speed(f->config->cdev->gadget, f,
665 hidg->out_ep);
666 if (status) {
667 ERROR(cdev, "config_ep_by_speed FAILED!\n");
668 goto free_req_in;
669 }
670 status = usb_ep_enable(hidg->out_ep);
671 if (status < 0) {
672 ERROR(cdev, "Enable OUT endpoint FAILED!\n");
673 goto free_req_in;
674 }
675 hidg->out_ep->driver_data = hidg;
676
677
678
679
680 for (i = 0; i < hidg->qlen && status == 0; i++) {
681 struct usb_request *req =
682 hidg_alloc_ep_req(hidg->out_ep,
683 hidg->report_length);
684 if (req) {
685 req->complete = hidg_set_report_complete;
686 req->context = hidg;
687 status = usb_ep_queue(hidg->out_ep, req,
688 GFP_ATOMIC);
689 if (status) {
690 ERROR(cdev, "%s queue req --> %d\n",
691 hidg->out_ep->name, status);
692 free_ep_req(hidg->out_ep, req);
693 }
694 } else {
695 status = -ENOMEM;
696 goto disable_out_ep;
697 }
698 }
699 }
700
701 if (hidg->in_ep != NULL) {
702 spin_lock_irqsave(&hidg->write_spinlock, flags);
703 hidg->req = req_in;
704 hidg->write_pending = 0;
705 spin_unlock_irqrestore(&hidg->write_spinlock, flags);
706
707 wake_up(&hidg->write_queue);
708 }
709 return 0;
710disable_out_ep:
711 usb_ep_disable(hidg->out_ep);
712free_req_in:
713 if (req_in)
714 free_ep_req(hidg->in_ep, req_in);
715
716disable_ep_in:
717 if (hidg->in_ep)
718 usb_ep_disable(hidg->in_ep);
719
720fail:
721 return status;
722}
723
724static const struct file_operations f_hidg_fops = {
725 .owner = THIS_MODULE,
726 .open = f_hidg_open,
727 .release = f_hidg_release,
728 .write = f_hidg_write,
729 .read = f_hidg_read,
730 .poll = f_hidg_poll,
731 .llseek = noop_llseek,
732};
733
734static int hidg_bind(struct usb_configuration *c, struct usb_function *f)
735{
736 struct usb_ep *ep;
737 struct f_hidg *hidg = func_to_hidg(f);
738 struct usb_string *us;
739 struct device *device;
740 int status;
741 dev_t dev;
742
743
744 us = usb_gstrings_attach(c->cdev, ct_func_strings,
745 ARRAY_SIZE(ct_func_string_defs));
746 if (IS_ERR(us))
747 return PTR_ERR(us);
748 hidg_interface_desc.iInterface = us[CT_FUNC_HID_IDX].id;
749
750
751 status = usb_interface_id(c, f);
752 if (status < 0)
753 goto fail;
754 hidg_interface_desc.bInterfaceNumber = status;
755
756
757 status = -ENODEV;
758 ep = usb_ep_autoconfig(c->cdev->gadget, &hidg_fs_in_ep_desc);
759 if (!ep)
760 goto fail;
761 hidg->in_ep = ep;
762
763 ep = usb_ep_autoconfig(c->cdev->gadget, &hidg_fs_out_ep_desc);
764 if (!ep)
765 goto fail;
766 hidg->out_ep = ep;
767
768
769 hidg_interface_desc.bInterfaceSubClass = hidg->bInterfaceSubClass;
770 hidg_interface_desc.bInterfaceProtocol = hidg->bInterfaceProtocol;
771 hidg_ss_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length);
772 hidg_ss_in_comp_desc.wBytesPerInterval =
773 cpu_to_le16(hidg->report_length);
774 hidg_hs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length);
775 hidg_fs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length);
776 hidg_ss_out_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length);
777 hidg_ss_out_comp_desc.wBytesPerInterval =
778 cpu_to_le16(hidg->report_length);
779 hidg_hs_out_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length);
780 hidg_fs_out_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length);
781
782
783
784
785 hidg_desc.desc[0].bDescriptorType = HID_DT_REPORT;
786 hidg_desc.desc[0].wDescriptorLength =
787 cpu_to_le16(hidg->report_desc_length);
788
789 hidg_hs_in_ep_desc.bEndpointAddress =
790 hidg_fs_in_ep_desc.bEndpointAddress;
791 hidg_hs_out_ep_desc.bEndpointAddress =
792 hidg_fs_out_ep_desc.bEndpointAddress;
793
794 hidg_ss_in_ep_desc.bEndpointAddress =
795 hidg_fs_in_ep_desc.bEndpointAddress;
796 hidg_ss_out_ep_desc.bEndpointAddress =
797 hidg_fs_out_ep_desc.bEndpointAddress;
798
799 status = usb_assign_descriptors(f, hidg_fs_descriptors,
800 hidg_hs_descriptors, hidg_ss_descriptors, NULL);
801 if (status)
802 goto fail;
803
804 spin_lock_init(&hidg->write_spinlock);
805 hidg->write_pending = 1;
806 hidg->req = NULL;
807 spin_lock_init(&hidg->read_spinlock);
808 init_waitqueue_head(&hidg->write_queue);
809 init_waitqueue_head(&hidg->read_queue);
810 INIT_LIST_HEAD(&hidg->completed_out_req);
811
812
813 cdev_init(&hidg->cdev, &f_hidg_fops);
814 dev = MKDEV(major, hidg->minor);
815 status = cdev_add(&hidg->cdev, dev, 1);
816 if (status)
817 goto fail_free_descs;
818
819 device = device_create(hidg_class, NULL, dev, NULL,
820 "%s%d", "hidg", hidg->minor);
821 if (IS_ERR(device)) {
822 status = PTR_ERR(device);
823 goto del;
824 }
825
826 return 0;
827del:
828 cdev_del(&hidg->cdev);
829fail_free_descs:
830 usb_free_all_descriptors(f);
831fail:
832 ERROR(f->config->cdev, "hidg_bind FAILED\n");
833 if (hidg->req != NULL)
834 free_ep_req(hidg->in_ep, hidg->req);
835
836 return status;
837}
838
839static inline int hidg_get_minor(void)
840{
841 int ret;
842
843 ret = ida_simple_get(&hidg_ida, 0, 0, GFP_KERNEL);
844 if (ret >= HIDG_MINORS) {
845 ida_simple_remove(&hidg_ida, ret);
846 ret = -ENODEV;
847 }
848
849 return ret;
850}
851
852static inline struct f_hid_opts *to_f_hid_opts(struct config_item *item)
853{
854 return container_of(to_config_group(item), struct f_hid_opts,
855 func_inst.group);
856}
857
858static void hid_attr_release(struct config_item *item)
859{
860 struct f_hid_opts *opts = to_f_hid_opts(item);
861
862 usb_put_function_instance(&opts->func_inst);
863}
864
865static struct configfs_item_operations hidg_item_ops = {
866 .release = hid_attr_release,
867};
868
869#define F_HID_OPT(name, prec, limit) \
870static ssize_t f_hid_opts_##name##_show(struct config_item *item, char *page)\
871{ \
872 struct f_hid_opts *opts = to_f_hid_opts(item); \
873 int result; \
874 \
875 mutex_lock(&opts->lock); \
876 result = sprintf(page, "%d\n", opts->name); \
877 mutex_unlock(&opts->lock); \
878 \
879 return result; \
880} \
881 \
882static ssize_t f_hid_opts_##name##_store(struct config_item *item, \
883 const char *page, size_t len) \
884{ \
885 struct f_hid_opts *opts = to_f_hid_opts(item); \
886 int ret; \
887 u##prec num; \
888 \
889 mutex_lock(&opts->lock); \
890 if (opts->refcnt) { \
891 ret = -EBUSY; \
892 goto end; \
893 } \
894 \
895 ret = kstrtou##prec(page, 0, &num); \
896 if (ret) \
897 goto end; \
898 \
899 if (num > limit) { \
900 ret = -EINVAL; \
901 goto end; \
902 } \
903 opts->name = num; \
904 ret = len; \
905 \
906end: \
907 mutex_unlock(&opts->lock); \
908 return ret; \
909} \
910 \
911CONFIGFS_ATTR(f_hid_opts_, name)
912
913F_HID_OPT(subclass, 8, 255);
914F_HID_OPT(protocol, 8, 255);
915F_HID_OPT(report_length, 16, 65535);
916
917static ssize_t f_hid_opts_report_desc_show(struct config_item *item, char *page)
918{
919 struct f_hid_opts *opts = to_f_hid_opts(item);
920 int result;
921
922 mutex_lock(&opts->lock);
923 result = opts->report_desc_length;
924 memcpy(page, opts->report_desc, opts->report_desc_length);
925 mutex_unlock(&opts->lock);
926
927 return result;
928}
929
930static ssize_t f_hid_opts_report_desc_store(struct config_item *item,
931 const char *page, size_t len)
932{
933 struct f_hid_opts *opts = to_f_hid_opts(item);
934 int ret = -EBUSY;
935 char *d;
936
937 mutex_lock(&opts->lock);
938
939 if (opts->refcnt)
940 goto end;
941 if (len > PAGE_SIZE) {
942 ret = -ENOSPC;
943 goto end;
944 }
945 d = kmemdup(page, len, GFP_KERNEL);
946 if (!d) {
947 ret = -ENOMEM;
948 goto end;
949 }
950 kfree(opts->report_desc);
951 opts->report_desc = d;
952 opts->report_desc_length = len;
953 opts->report_desc_alloc = true;
954 ret = len;
955end:
956 mutex_unlock(&opts->lock);
957 return ret;
958}
959
960CONFIGFS_ATTR(f_hid_opts_, report_desc);
961
962static ssize_t f_hid_opts_dev_show(struct config_item *item, char *page)
963{
964 struct f_hid_opts *opts = to_f_hid_opts(item);
965
966 return sprintf(page, "%d:%d\n", major, opts->minor);
967}
968
969CONFIGFS_ATTR_RO(f_hid_opts_, dev);
970
971static struct configfs_attribute *hid_attrs[] = {
972 &f_hid_opts_attr_subclass,
973 &f_hid_opts_attr_protocol,
974 &f_hid_opts_attr_report_length,
975 &f_hid_opts_attr_report_desc,
976 &f_hid_opts_attr_dev,
977 NULL,
978};
979
980static struct config_item_type hid_func_type = {
981 .ct_item_ops = &hidg_item_ops,
982 .ct_attrs = hid_attrs,
983 .ct_owner = THIS_MODULE,
984};
985
986static inline void hidg_put_minor(int minor)
987{
988 ida_simple_remove(&hidg_ida, minor);
989}
990
991static void hidg_free_inst(struct usb_function_instance *f)
992{
993 struct f_hid_opts *opts;
994
995 opts = container_of(f, struct f_hid_opts, func_inst);
996
997 mutex_lock(&hidg_ida_lock);
998
999 hidg_put_minor(opts->minor);
1000 if (ida_is_empty(&hidg_ida))
1001 ghid_cleanup();
1002
1003 mutex_unlock(&hidg_ida_lock);
1004
1005 if (opts->report_desc_alloc)
1006 kfree(opts->report_desc);
1007
1008 kfree(opts);
1009}
1010
1011static struct usb_function_instance *hidg_alloc_inst(void)
1012{
1013 struct f_hid_opts *opts;
1014 struct usb_function_instance *ret;
1015 int status = 0;
1016
1017 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1018 if (!opts)
1019 return ERR_PTR(-ENOMEM);
1020 mutex_init(&opts->lock);
1021 opts->func_inst.free_func_inst = hidg_free_inst;
1022 ret = &opts->func_inst;
1023
1024 mutex_lock(&hidg_ida_lock);
1025
1026 if (ida_is_empty(&hidg_ida)) {
1027 status = ghid_setup(NULL, HIDG_MINORS);
1028 if (status) {
1029 ret = ERR_PTR(status);
1030 kfree(opts);
1031 goto unlock;
1032 }
1033 }
1034
1035 opts->minor = hidg_get_minor();
1036 if (opts->minor < 0) {
1037 ret = ERR_PTR(opts->minor);
1038 kfree(opts);
1039 if (ida_is_empty(&hidg_ida))
1040 ghid_cleanup();
1041 goto unlock;
1042 }
1043 config_group_init_type_name(&opts->func_inst.group, "", &hid_func_type);
1044
1045unlock:
1046 mutex_unlock(&hidg_ida_lock);
1047 return ret;
1048}
1049
1050static void hidg_free(struct usb_function *f)
1051{
1052 struct f_hidg *hidg;
1053 struct f_hid_opts *opts;
1054
1055 hidg = func_to_hidg(f);
1056 opts = container_of(f->fi, struct f_hid_opts, func_inst);
1057 kfree(hidg->report_desc);
1058 kfree(hidg);
1059 mutex_lock(&opts->lock);
1060 --opts->refcnt;
1061 mutex_unlock(&opts->lock);
1062}
1063
1064static void hidg_unbind(struct usb_configuration *c, struct usb_function *f)
1065{
1066 struct f_hidg *hidg = func_to_hidg(f);
1067
1068 device_destroy(hidg_class, MKDEV(major, hidg->minor));
1069 cdev_del(&hidg->cdev);
1070
1071 usb_free_all_descriptors(f);
1072}
1073
1074static struct usb_function *hidg_alloc(struct usb_function_instance *fi)
1075{
1076 struct f_hidg *hidg;
1077 struct f_hid_opts *opts;
1078
1079
1080 hidg = kzalloc(sizeof(*hidg), GFP_KERNEL);
1081 if (!hidg)
1082 return ERR_PTR(-ENOMEM);
1083
1084 opts = container_of(fi, struct f_hid_opts, func_inst);
1085
1086 mutex_lock(&opts->lock);
1087 ++opts->refcnt;
1088
1089 hidg->minor = opts->minor;
1090 hidg->bInterfaceSubClass = opts->subclass;
1091 hidg->bInterfaceProtocol = opts->protocol;
1092 hidg->report_length = opts->report_length;
1093 hidg->report_desc_length = opts->report_desc_length;
1094 if (opts->report_desc) {
1095 hidg->report_desc = kmemdup(opts->report_desc,
1096 opts->report_desc_length,
1097 GFP_KERNEL);
1098 if (!hidg->report_desc) {
1099 kfree(hidg);
1100 mutex_unlock(&opts->lock);
1101 return ERR_PTR(-ENOMEM);
1102 }
1103 }
1104
1105 mutex_unlock(&opts->lock);
1106
1107 hidg->func.name = "hid";
1108 hidg->func.bind = hidg_bind;
1109 hidg->func.unbind = hidg_unbind;
1110 hidg->func.set_alt = hidg_set_alt;
1111 hidg->func.disable = hidg_disable;
1112 hidg->func.setup = hidg_setup;
1113 hidg->func.free_func = hidg_free;
1114
1115
1116 hidg->qlen = 4;
1117
1118 return &hidg->func;
1119}
1120
1121DECLARE_USB_FUNCTION_INIT(hid, hidg_alloc_inst, hidg_alloc);
1122MODULE_LICENSE("GPL");
1123MODULE_AUTHOR("Fabien Chouteau");
1124
1125int ghid_setup(struct usb_gadget *g, int count)
1126{
1127 int status;
1128 dev_t dev;
1129
1130 hidg_class = class_create(THIS_MODULE, "hidg");
1131 if (IS_ERR(hidg_class)) {
1132 status = PTR_ERR(hidg_class);
1133 hidg_class = NULL;
1134 return status;
1135 }
1136
1137 status = alloc_chrdev_region(&dev, 0, count, "hidg");
1138 if (status) {
1139 class_destroy(hidg_class);
1140 hidg_class = NULL;
1141 return status;
1142 }
1143
1144 major = MAJOR(dev);
1145 minors = count;
1146
1147 return 0;
1148}
1149
1150void ghid_cleanup(void)
1151{
1152 if (major) {
1153 unregister_chrdev_region(MKDEV(major, 0), minors);
1154 major = minors = 0;
1155 }
1156
1157 class_destroy(hidg_class);
1158 hidg_class = NULL;
1159}
1160
