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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 spinlock;
54 wait_queue_head_t read_queue;
55 unsigned int qlen;
56
57
58 struct mutex lock;
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_hs_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_endpoint_descriptor hidg_hs_out_ep_desc = {
116 .bLength = USB_DT_ENDPOINT_SIZE,
117 .bDescriptorType = USB_DT_ENDPOINT,
118 .bEndpointAddress = USB_DIR_OUT,
119 .bmAttributes = USB_ENDPOINT_XFER_INT,
120
121 .bInterval = 4,
122
123
124
125};
126
127static struct usb_descriptor_header *hidg_hs_descriptors[] = {
128 (struct usb_descriptor_header *)&hidg_interface_desc,
129 (struct usb_descriptor_header *)&hidg_desc,
130 (struct usb_descriptor_header *)&hidg_hs_in_ep_desc,
131 (struct usb_descriptor_header *)&hidg_hs_out_ep_desc,
132 NULL,
133};
134
135
136
137static struct usb_endpoint_descriptor hidg_fs_in_ep_desc = {
138 .bLength = USB_DT_ENDPOINT_SIZE,
139 .bDescriptorType = USB_DT_ENDPOINT,
140 .bEndpointAddress = USB_DIR_IN,
141 .bmAttributes = USB_ENDPOINT_XFER_INT,
142
143 .bInterval = 10,
144
145
146
147};
148
149static struct usb_endpoint_descriptor hidg_fs_out_ep_desc = {
150 .bLength = USB_DT_ENDPOINT_SIZE,
151 .bDescriptorType = USB_DT_ENDPOINT,
152 .bEndpointAddress = USB_DIR_OUT,
153 .bmAttributes = USB_ENDPOINT_XFER_INT,
154
155 .bInterval = 10,
156
157
158
159};
160
161static struct usb_descriptor_header *hidg_fs_descriptors[] = {
162 (struct usb_descriptor_header *)&hidg_interface_desc,
163 (struct usb_descriptor_header *)&hidg_desc,
164 (struct usb_descriptor_header *)&hidg_fs_in_ep_desc,
165 (struct usb_descriptor_header *)&hidg_fs_out_ep_desc,
166 NULL,
167};
168
169
170
171
172#define CT_FUNC_HID_IDX 0
173
174static struct usb_string ct_func_string_defs[] = {
175 [CT_FUNC_HID_IDX].s = "HID Interface",
176 {},
177};
178
179static struct usb_gadget_strings ct_func_string_table = {
180 .language = 0x0409,
181 .strings = ct_func_string_defs,
182};
183
184static struct usb_gadget_strings *ct_func_strings[] = {
185 &ct_func_string_table,
186 NULL,
187};
188
189
190
191
192static ssize_t f_hidg_read(struct file *file, char __user *buffer,
193 size_t count, loff_t *ptr)
194{
195 struct f_hidg *hidg = file->private_data;
196 struct f_hidg_req_list *list;
197 struct usb_request *req;
198 unsigned long flags;
199 int ret;
200
201 if (!count)
202 return 0;
203
204 if (!access_ok(VERIFY_WRITE, buffer, count))
205 return -EFAULT;
206
207 spin_lock_irqsave(&hidg->spinlock, flags);
208
209#define READ_COND (!list_empty(&hidg->completed_out_req))
210
211
212 while (!READ_COND) {
213 spin_unlock_irqrestore(&hidg->spinlock, flags);
214 if (file->f_flags & O_NONBLOCK)
215 return -EAGAIN;
216
217 if (wait_event_interruptible(hidg->read_queue, READ_COND))
218 return -ERESTARTSYS;
219
220 spin_lock_irqsave(&hidg->spinlock, flags);
221 }
222
223
224 list = list_first_entry(&hidg->completed_out_req,
225 struct f_hidg_req_list, list);
226 req = list->req;
227 count = min_t(unsigned int, count, req->actual - list->pos);
228 spin_unlock_irqrestore(&hidg->spinlock, flags);
229
230
231 count -= copy_to_user(buffer, req->buf + list->pos, count);
232 list->pos += count;
233
234
235
236
237
238
239
240 if (list->pos == req->actual) {
241 spin_lock_irqsave(&hidg->spinlock, flags);
242 list_del(&list->list);
243 kfree(list);
244 spin_unlock_irqrestore(&hidg->spinlock, flags);
245
246 req->length = hidg->report_length;
247 ret = usb_ep_queue(hidg->out_ep, req, GFP_KERNEL);
248 if (ret < 0)
249 return ret;
250 }
251
252 return count;
253}
254
255static void f_hidg_req_complete(struct usb_ep *ep, struct usb_request *req)
256{
257 struct f_hidg *hidg = (struct f_hidg *)ep->driver_data;
258
259 if (req->status != 0) {
260 ERROR(hidg->func.config->cdev,
261 "End Point Request ERROR: %d\n", req->status);
262 }
263
264 hidg->write_pending = 0;
265 wake_up(&hidg->write_queue);
266}
267
268static ssize_t f_hidg_write(struct file *file, const char __user *buffer,
269 size_t count, loff_t *offp)
270{
271 struct f_hidg *hidg = file->private_data;
272 ssize_t status = -ENOMEM;
273
274 if (!access_ok(VERIFY_READ, buffer, count))
275 return -EFAULT;
276
277 mutex_lock(&hidg->lock);
278
279#define WRITE_COND (!hidg->write_pending)
280
281
282 while (!WRITE_COND) {
283 mutex_unlock(&hidg->lock);
284 if (file->f_flags & O_NONBLOCK)
285 return -EAGAIN;
286
287 if (wait_event_interruptible_exclusive(
288 hidg->write_queue, WRITE_COND))
289 return -ERESTARTSYS;
290
291 mutex_lock(&hidg->lock);
292 }
293
294 count = min_t(unsigned, count, hidg->report_length);
295 status = copy_from_user(hidg->req->buf, buffer, count);
296
297 if (status != 0) {
298 ERROR(hidg->func.config->cdev,
299 "copy_from_user error\n");
300 mutex_unlock(&hidg->lock);
301 return -EINVAL;
302 }
303
304 hidg->req->status = 0;
305 hidg->req->zero = 0;
306 hidg->req->length = count;
307 hidg->req->complete = f_hidg_req_complete;
308 hidg->req->context = hidg;
309 hidg->write_pending = 1;
310
311 status = usb_ep_queue(hidg->in_ep, hidg->req, GFP_ATOMIC);
312 if (status < 0) {
313 ERROR(hidg->func.config->cdev,
314 "usb_ep_queue error on int endpoint %zd\n", status);
315 hidg->write_pending = 0;
316 wake_up(&hidg->write_queue);
317 } else {
318 status = count;
319 }
320
321 mutex_unlock(&hidg->lock);
322
323 return status;
324}
325
326static unsigned int f_hidg_poll(struct file *file, poll_table *wait)
327{
328 struct f_hidg *hidg = file->private_data;
329 unsigned int ret = 0;
330
331 poll_wait(file, &hidg->read_queue, wait);
332 poll_wait(file, &hidg->write_queue, wait);
333
334 if (WRITE_COND)
335 ret |= POLLOUT | POLLWRNORM;
336
337 if (READ_COND)
338 ret |= POLLIN | POLLRDNORM;
339
340 return ret;
341}
342
343#undef WRITE_COND
344#undef READ_COND
345
346static int f_hidg_release(struct inode *inode, struct file *fd)
347{
348 fd->private_data = NULL;
349 return 0;
350}
351
352static int f_hidg_open(struct inode *inode, struct file *fd)
353{
354 struct f_hidg *hidg =
355 container_of(inode->i_cdev, struct f_hidg, cdev);
356
357 fd->private_data = hidg;
358
359 return 0;
360}
361
362
363
364
365static inline struct usb_request *hidg_alloc_ep_req(struct usb_ep *ep,
366 unsigned length)
367{
368 return alloc_ep_req(ep, length, length);
369}
370
371static void hidg_set_report_complete(struct usb_ep *ep, struct usb_request *req)
372{
373 struct f_hidg *hidg = (struct f_hidg *) req->context;
374 struct f_hidg_req_list *req_list;
375 unsigned long flags;
376
377 req_list = kzalloc(sizeof(*req_list), GFP_ATOMIC);
378 if (!req_list)
379 return;
380
381 req_list->req = req;
382
383 spin_lock_irqsave(&hidg->spinlock, flags);
384 list_add_tail(&req_list->list, &hidg->completed_out_req);
385 spin_unlock_irqrestore(&hidg->spinlock, flags);
386
387 wake_up(&hidg->read_queue);
388}
389
390static int hidg_setup(struct usb_function *f,
391 const struct usb_ctrlrequest *ctrl)
392{
393 struct f_hidg *hidg = func_to_hidg(f);
394 struct usb_composite_dev *cdev = f->config->cdev;
395 struct usb_request *req = cdev->req;
396 int status = 0;
397 __u16 value, length;
398
399 value = __le16_to_cpu(ctrl->wValue);
400 length = __le16_to_cpu(ctrl->wLength);
401
402 VDBG(cdev,
403 "%s crtl_request : bRequestType:0x%x bRequest:0x%x Value:0x%x\n",
404 __func__, ctrl->bRequestType, ctrl->bRequest, value);
405
406 switch ((ctrl->bRequestType << 8) | ctrl->bRequest) {
407 case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
408 | HID_REQ_GET_REPORT):
409 VDBG(cdev, "get_report\n");
410
411
412 length = min_t(unsigned, length, hidg->report_length);
413 memset(req->buf, 0x0, length);
414
415 goto respond;
416 break;
417
418 case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
419 | HID_REQ_GET_PROTOCOL):
420 VDBG(cdev, "get_protocol\n");
421 goto stall;
422 break;
423
424 case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
425 | HID_REQ_SET_REPORT):
426 VDBG(cdev, "set_report | wLength=%d\n", ctrl->wLength);
427 goto stall;
428 break;
429
430 case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
431 | HID_REQ_SET_PROTOCOL):
432 VDBG(cdev, "set_protocol\n");
433 goto stall;
434 break;
435
436 case ((USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_INTERFACE) << 8
437 | USB_REQ_GET_DESCRIPTOR):
438 switch (value >> 8) {
439 case HID_DT_HID:
440 VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: HID\n");
441 length = min_t(unsigned short, length,
442 hidg_desc.bLength);
443 memcpy(req->buf, &hidg_desc, length);
444 goto respond;
445 break;
446 case HID_DT_REPORT:
447 VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: REPORT\n");
448 length = min_t(unsigned short, length,
449 hidg->report_desc_length);
450 memcpy(req->buf, hidg->report_desc, length);
451 goto respond;
452 break;
453
454 default:
455 VDBG(cdev, "Unknown descriptor request 0x%x\n",
456 value >> 8);
457 goto stall;
458 break;
459 }
460 break;
461
462 default:
463 VDBG(cdev, "Unknown request 0x%x\n",
464 ctrl->bRequest);
465 goto stall;
466 break;
467 }
468
469stall:
470 return -EOPNOTSUPP;
471
472respond:
473 req->zero = 0;
474 req->length = length;
475 status = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
476 if (status < 0)
477 ERROR(cdev, "usb_ep_queue error on ep0 %d\n", value);
478 return status;
479}
480
481static void hidg_disable(struct usb_function *f)
482{
483 struct f_hidg *hidg = func_to_hidg(f);
484 struct f_hidg_req_list *list, *next;
485
486 usb_ep_disable(hidg->in_ep);
487 hidg->in_ep->driver_data = NULL;
488
489 usb_ep_disable(hidg->out_ep);
490 hidg->out_ep->driver_data = NULL;
491
492 list_for_each_entry_safe(list, next, &hidg->completed_out_req, list) {
493 list_del(&list->list);
494 kfree(list);
495 }
496}
497
498static int hidg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
499{
500 struct usb_composite_dev *cdev = f->config->cdev;
501 struct f_hidg *hidg = func_to_hidg(f);
502 int i, status = 0;
503
504 VDBG(cdev, "hidg_set_alt intf:%d alt:%d\n", intf, alt);
505
506 if (hidg->in_ep != NULL) {
507
508 if (hidg->in_ep->driver_data != NULL)
509 usb_ep_disable(hidg->in_ep);
510
511 status = config_ep_by_speed(f->config->cdev->gadget, f,
512 hidg->in_ep);
513 if (status) {
514 ERROR(cdev, "config_ep_by_speed FAILED!\n");
515 goto fail;
516 }
517 status = usb_ep_enable(hidg->in_ep);
518 if (status < 0) {
519 ERROR(cdev, "Enable IN endpoint FAILED!\n");
520 goto fail;
521 }
522 hidg->in_ep->driver_data = hidg;
523 }
524
525
526 if (hidg->out_ep != NULL) {
527
528 if (hidg->out_ep->driver_data != NULL)
529 usb_ep_disable(hidg->out_ep);
530
531 status = config_ep_by_speed(f->config->cdev->gadget, f,
532 hidg->out_ep);
533 if (status) {
534 ERROR(cdev, "config_ep_by_speed FAILED!\n");
535 goto fail;
536 }
537 status = usb_ep_enable(hidg->out_ep);
538 if (status < 0) {
539 ERROR(cdev, "Enable IN endpoint FAILED!\n");
540 goto fail;
541 }
542 hidg->out_ep->driver_data = hidg;
543
544
545
546
547 for (i = 0; i < hidg->qlen && status == 0; i++) {
548 struct usb_request *req =
549 hidg_alloc_ep_req(hidg->out_ep,
550 hidg->report_length);
551 if (req) {
552 req->complete = hidg_set_report_complete;
553 req->context = hidg;
554 status = usb_ep_queue(hidg->out_ep, req,
555 GFP_ATOMIC);
556 if (status)
557 ERROR(cdev, "%s queue req --> %d\n",
558 hidg->out_ep->name, status);
559 } else {
560 usb_ep_disable(hidg->out_ep);
561 hidg->out_ep->driver_data = NULL;
562 status = -ENOMEM;
563 goto fail;
564 }
565 }
566 }
567
568fail:
569 return status;
570}
571
572static const struct file_operations f_hidg_fops = {
573 .owner = THIS_MODULE,
574 .open = f_hidg_open,
575 .release = f_hidg_release,
576 .write = f_hidg_write,
577 .read = f_hidg_read,
578 .poll = f_hidg_poll,
579 .llseek = noop_llseek,
580};
581
582static int hidg_bind(struct usb_configuration *c, struct usb_function *f)
583{
584 struct usb_ep *ep;
585 struct f_hidg *hidg = func_to_hidg(f);
586 struct usb_string *us;
587 struct device *device;
588 int status;
589 dev_t dev;
590
591
592 us = usb_gstrings_attach(c->cdev, ct_func_strings,
593 ARRAY_SIZE(ct_func_string_defs));
594 if (IS_ERR(us))
595 return PTR_ERR(us);
596 hidg_interface_desc.iInterface = us[CT_FUNC_HID_IDX].id;
597
598
599 status = usb_interface_id(c, f);
600 if (status < 0)
601 goto fail;
602 hidg_interface_desc.bInterfaceNumber = status;
603
604
605 status = -ENODEV;
606 ep = usb_ep_autoconfig(c->cdev->gadget, &hidg_fs_in_ep_desc);
607 if (!ep)
608 goto fail;
609 ep->driver_data = c->cdev;
610 hidg->in_ep = ep;
611
612 ep = usb_ep_autoconfig(c->cdev->gadget, &hidg_fs_out_ep_desc);
613 if (!ep)
614 goto fail;
615 ep->driver_data = c->cdev;
616 hidg->out_ep = ep;
617
618
619 status = -ENOMEM;
620 hidg->req = usb_ep_alloc_request(hidg->in_ep, GFP_KERNEL);
621 if (!hidg->req)
622 goto fail;
623
624 hidg->req->buf = kmalloc(hidg->report_length, GFP_KERNEL);
625 if (!hidg->req->buf)
626 goto fail;
627
628
629 hidg_interface_desc.bInterfaceSubClass = hidg->bInterfaceSubClass;
630 hidg_interface_desc.bInterfaceProtocol = hidg->bInterfaceProtocol;
631 hidg_hs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length);
632 hidg_fs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length);
633 hidg_hs_out_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length);
634 hidg_fs_out_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length);
635 hidg_desc.desc[0].bDescriptorType = HID_DT_REPORT;
636 hidg_desc.desc[0].wDescriptorLength =
637 cpu_to_le16(hidg->report_desc_length);
638
639 hidg_hs_in_ep_desc.bEndpointAddress =
640 hidg_fs_in_ep_desc.bEndpointAddress;
641 hidg_hs_out_ep_desc.bEndpointAddress =
642 hidg_fs_out_ep_desc.bEndpointAddress;
643
644 status = usb_assign_descriptors(f, hidg_fs_descriptors,
645 hidg_hs_descriptors, NULL);
646 if (status)
647 goto fail;
648
649 mutex_init(&hidg->lock);
650 spin_lock_init(&hidg->spinlock);
651 init_waitqueue_head(&hidg->write_queue);
652 init_waitqueue_head(&hidg->read_queue);
653 INIT_LIST_HEAD(&hidg->completed_out_req);
654
655
656 cdev_init(&hidg->cdev, &f_hidg_fops);
657 dev = MKDEV(major, hidg->minor);
658 status = cdev_add(&hidg->cdev, dev, 1);
659 if (status)
660 goto fail_free_descs;
661
662 device = device_create(hidg_class, NULL, dev, NULL,
663 "%s%d", "hidg", hidg->minor);
664 if (IS_ERR(device)) {
665 status = PTR_ERR(device);
666 goto del;
667 }
668
669 return 0;
670del:
671 cdev_del(&hidg->cdev);
672fail_free_descs:
673 usb_free_all_descriptors(f);
674fail:
675 ERROR(f->config->cdev, "hidg_bind FAILED\n");
676 if (hidg->req != NULL) {
677 kfree(hidg->req->buf);
678 if (hidg->in_ep != NULL)
679 usb_ep_free_request(hidg->in_ep, hidg->req);
680 }
681
682 return status;
683}
684
685static inline int hidg_get_minor(void)
686{
687 int ret;
688
689 ret = ida_simple_get(&hidg_ida, 0, 0, GFP_KERNEL);
690
691 return ret;
692}
693
694static inline struct f_hid_opts *to_f_hid_opts(struct config_item *item)
695{
696 return container_of(to_config_group(item), struct f_hid_opts,
697 func_inst.group);
698}
699
700CONFIGFS_ATTR_STRUCT(f_hid_opts);
701CONFIGFS_ATTR_OPS(f_hid_opts);
702
703static void hid_attr_release(struct config_item *item)
704{
705 struct f_hid_opts *opts = to_f_hid_opts(item);
706
707 usb_put_function_instance(&opts->func_inst);
708}
709
710static struct configfs_item_operations hidg_item_ops = {
711 .release = hid_attr_release,
712 .show_attribute = f_hid_opts_attr_show,
713 .store_attribute = f_hid_opts_attr_store,
714};
715
716#define F_HID_OPT(name, prec, limit) \
717static ssize_t f_hid_opts_##name##_show(struct f_hid_opts *opts, char *page)\
718{ \
719 int result; \
720 \
721 mutex_lock(&opts->lock); \
722 result = sprintf(page, "%d\n", opts->name); \
723 mutex_unlock(&opts->lock); \
724 \
725 return result; \
726} \
727 \
728static ssize_t f_hid_opts_##name##_store(struct f_hid_opts *opts, \
729 const char *page, size_t len) \
730{ \
731 int ret; \
732 u##prec num; \
733 \
734 mutex_lock(&opts->lock); \
735 if (opts->refcnt) { \
736 ret = -EBUSY; \
737 goto end; \
738 } \
739 \
740 ret = kstrtou##prec(page, 0, &num); \
741 if (ret) \
742 goto end; \
743 \
744 if (num > limit) { \
745 ret = -EINVAL; \
746 goto end; \
747 } \
748 opts->name = num; \
749 ret = len; \
750 \
751end: \
752 mutex_unlock(&opts->lock); \
753 return ret; \
754} \
755 \
756static struct f_hid_opts_attribute f_hid_opts_##name = \
757 __CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, f_hid_opts_##name##_show,\
758 f_hid_opts_##name##_store)
759
760F_HID_OPT(subclass, 8, 255);
761F_HID_OPT(protocol, 8, 255);
762F_HID_OPT(report_length, 16, 65535);
763
764static ssize_t f_hid_opts_report_desc_show(struct f_hid_opts *opts, char *page)
765{
766 int result;
767
768 mutex_lock(&opts->lock);
769 result = opts->report_desc_length;
770 memcpy(page, opts->report_desc, opts->report_desc_length);
771 mutex_unlock(&opts->lock);
772
773 return result;
774}
775
776static ssize_t f_hid_opts_report_desc_store(struct f_hid_opts *opts,
777 const char *page, size_t len)
778{
779 int ret = -EBUSY;
780 char *d;
781
782 mutex_lock(&opts->lock);
783
784 if (opts->refcnt)
785 goto end;
786 if (len > PAGE_SIZE) {
787 ret = -ENOSPC;
788 goto end;
789 }
790 d = kmemdup(page, len, GFP_KERNEL);
791 if (!d) {
792 ret = -ENOMEM;
793 goto end;
794 }
795 kfree(opts->report_desc);
796 opts->report_desc = d;
797 opts->report_desc_length = len;
798 opts->report_desc_alloc = true;
799 ret = len;
800end:
801 mutex_unlock(&opts->lock);
802 return ret;
803}
804
805static struct f_hid_opts_attribute f_hid_opts_report_desc =
806 __CONFIGFS_ATTR(report_desc, S_IRUGO | S_IWUSR,
807 f_hid_opts_report_desc_show,
808 f_hid_opts_report_desc_store);
809
810static struct configfs_attribute *hid_attrs[] = {
811 &f_hid_opts_subclass.attr,
812 &f_hid_opts_protocol.attr,
813 &f_hid_opts_report_length.attr,
814 &f_hid_opts_report_desc.attr,
815 NULL,
816};
817
818static struct config_item_type hid_func_type = {
819 .ct_item_ops = &hidg_item_ops,
820 .ct_attrs = hid_attrs,
821 .ct_owner = THIS_MODULE,
822};
823
824static inline void hidg_put_minor(int minor)
825{
826 ida_simple_remove(&hidg_ida, minor);
827}
828
829static void hidg_free_inst(struct usb_function_instance *f)
830{
831 struct f_hid_opts *opts;
832
833 opts = container_of(f, struct f_hid_opts, func_inst);
834
835 mutex_lock(&hidg_ida_lock);
836
837 hidg_put_minor(opts->minor);
838 if (idr_is_empty(&hidg_ida.idr))
839 ghid_cleanup();
840
841 mutex_unlock(&hidg_ida_lock);
842
843 if (opts->report_desc_alloc)
844 kfree(opts->report_desc);
845
846 kfree(opts);
847}
848
849static struct usb_function_instance *hidg_alloc_inst(void)
850{
851 struct f_hid_opts *opts;
852 struct usb_function_instance *ret;
853 int status = 0;
854
855 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
856 if (!opts)
857 return ERR_PTR(-ENOMEM);
858 mutex_init(&opts->lock);
859 opts->func_inst.free_func_inst = hidg_free_inst;
860 ret = &opts->func_inst;
861
862 mutex_lock(&hidg_ida_lock);
863
864 if (idr_is_empty(&hidg_ida.idr)) {
865 status = ghid_setup(NULL, HIDG_MINORS);
866 if (status) {
867 ret = ERR_PTR(status);
868 kfree(opts);
869 goto unlock;
870 }
871 }
872
873 opts->minor = hidg_get_minor();
874 if (opts->minor < 0) {
875 ret = ERR_PTR(opts->minor);
876 kfree(opts);
877 if (idr_is_empty(&hidg_ida.idr))
878 ghid_cleanup();
879 goto unlock;
880 }
881 config_group_init_type_name(&opts->func_inst.group, "", &hid_func_type);
882
883unlock:
884 mutex_unlock(&hidg_ida_lock);
885 return ret;
886}
887
888static void hidg_free(struct usb_function *f)
889{
890 struct f_hidg *hidg;
891 struct f_hid_opts *opts;
892
893 hidg = func_to_hidg(f);
894 opts = container_of(f->fi, struct f_hid_opts, func_inst);
895 kfree(hidg->report_desc);
896 kfree(hidg);
897 mutex_lock(&opts->lock);
898 --opts->refcnt;
899 mutex_unlock(&opts->lock);
900}
901
902static void hidg_unbind(struct usb_configuration *c, struct usb_function *f)
903{
904 struct f_hidg *hidg = func_to_hidg(f);
905
906 device_destroy(hidg_class, MKDEV(major, hidg->minor));
907 cdev_del(&hidg->cdev);
908
909
910 usb_ep_disable(hidg->in_ep);
911 usb_ep_dequeue(hidg->in_ep, hidg->req);
912 kfree(hidg->req->buf);
913 usb_ep_free_request(hidg->in_ep, hidg->req);
914
915 usb_free_all_descriptors(f);
916}
917
918static struct usb_function *hidg_alloc(struct usb_function_instance *fi)
919{
920 struct f_hidg *hidg;
921 struct f_hid_opts *opts;
922
923
924 hidg = kzalloc(sizeof(*hidg), GFP_KERNEL);
925 if (!hidg)
926 return ERR_PTR(-ENOMEM);
927
928 opts = container_of(fi, struct f_hid_opts, func_inst);
929
930 mutex_lock(&opts->lock);
931 ++opts->refcnt;
932
933 hidg->minor = opts->minor;
934 hidg->bInterfaceSubClass = opts->subclass;
935 hidg->bInterfaceProtocol = opts->protocol;
936 hidg->report_length = opts->report_length;
937 hidg->report_desc_length = opts->report_desc_length;
938 if (opts->report_desc) {
939 hidg->report_desc = kmemdup(opts->report_desc,
940 opts->report_desc_length,
941 GFP_KERNEL);
942 if (!hidg->report_desc) {
943 kfree(hidg);
944 mutex_unlock(&opts->lock);
945 return ERR_PTR(-ENOMEM);
946 }
947 }
948
949 mutex_unlock(&opts->lock);
950
951 hidg->func.name = "hid";
952 hidg->func.bind = hidg_bind;
953 hidg->func.unbind = hidg_unbind;
954 hidg->func.set_alt = hidg_set_alt;
955 hidg->func.disable = hidg_disable;
956 hidg->func.setup = hidg_setup;
957 hidg->func.free_func = hidg_free;
958
959
960 hidg->qlen = 4;
961
962 return &hidg->func;
963}
964
965DECLARE_USB_FUNCTION_INIT(hid, hidg_alloc_inst, hidg_alloc);
966MODULE_LICENSE("GPL");
967MODULE_AUTHOR("Fabien Chouteau");
968
969int ghid_setup(struct usb_gadget *g, int count)
970{
971 int status;
972 dev_t dev;
973
974 hidg_class = class_create(THIS_MODULE, "hidg");
975 if (IS_ERR(hidg_class)) {
976 status = PTR_ERR(hidg_class);
977 hidg_class = NULL;
978 return status;
979 }
980
981 status = alloc_chrdev_region(&dev, 0, count, "hidg");
982 if (status) {
983 class_destroy(hidg_class);
984 hidg_class = NULL;
985 return status;
986 }
987
988 major = MAJOR(dev);
989 minors = count;
990
991 return 0;
992}
993
994void ghid_cleanup(void)
995{
996 if (major) {
997 unregister_chrdev_region(MKDEV(major, 0), minors);
998 major = minors = 0;
999 }
1000
1001 class_destroy(hidg_class);
1002 hidg_class = NULL;
1003}
1004
