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71adf118 FC |
1 | /* |
2 | * f_hid.c -- USB HID function driver | |
3 | * | |
4 | * Copyright (C) 2010 Fabien Chouteau <fabien.chouteau@barco.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
71adf118 FC |
10 | */ |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/utsname.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/hid.h> | |
16 | #include <linux/cdev.h> | |
17 | #include <linux/mutex.h> | |
18 | #include <linux/poll.h> | |
71adf118 FC |
19 | #include <linux/uaccess.h> |
20 | #include <linux/wait.h> | |
21 | #include <linux/usb/g_hid.h> | |
22 | ||
23 | static int major, minors; | |
24 | static struct class *hidg_class; | |
25 | ||
26 | /*-------------------------------------------------------------------------*/ | |
27 | /* HID gadget struct */ | |
28 | ||
29 | struct f_hidg { | |
30 | /* configuration */ | |
31 | unsigned char bInterfaceSubClass; | |
32 | unsigned char bInterfaceProtocol; | |
33 | unsigned short report_desc_length; | |
34 | char *report_desc; | |
35 | unsigned short report_length; | |
36 | ||
37 | /* recv report */ | |
38 | char *set_report_buff; | |
39 | unsigned short set_report_length; | |
40 | spinlock_t spinlock; | |
41 | wait_queue_head_t read_queue; | |
42 | ||
43 | /* send report */ | |
44 | struct mutex lock; | |
45 | bool write_pending; | |
46 | wait_queue_head_t write_queue; | |
47 | struct usb_request *req; | |
48 | ||
49 | int minor; | |
50 | struct cdev cdev; | |
51 | struct usb_function func; | |
52 | struct usb_ep *in_ep; | |
71adf118 FC |
53 | }; |
54 | ||
55 | static inline struct f_hidg *func_to_hidg(struct usb_function *f) | |
56 | { | |
57 | return container_of(f, struct f_hidg, func); | |
58 | } | |
59 | ||
60 | /*-------------------------------------------------------------------------*/ | |
61 | /* Static descriptors */ | |
62 | ||
63 | static struct usb_interface_descriptor hidg_interface_desc = { | |
64 | .bLength = sizeof hidg_interface_desc, | |
65 | .bDescriptorType = USB_DT_INTERFACE, | |
66 | /* .bInterfaceNumber = DYNAMIC */ | |
67 | .bAlternateSetting = 0, | |
68 | .bNumEndpoints = 1, | |
69 | .bInterfaceClass = USB_CLASS_HID, | |
70 | /* .bInterfaceSubClass = DYNAMIC */ | |
71 | /* .bInterfaceProtocol = DYNAMIC */ | |
72 | /* .iInterface = DYNAMIC */ | |
73 | }; | |
74 | ||
75 | static struct hid_descriptor hidg_desc = { | |
76 | .bLength = sizeof hidg_desc, | |
77 | .bDescriptorType = HID_DT_HID, | |
78 | .bcdHID = 0x0101, | |
79 | .bCountryCode = 0x00, | |
80 | .bNumDescriptors = 0x1, | |
81 | /*.desc[0].bDescriptorType = DYNAMIC */ | |
82 | /*.desc[0].wDescriptorLenght = DYNAMIC */ | |
83 | }; | |
84 | ||
85 | /* High-Speed Support */ | |
86 | ||
87 | static struct usb_endpoint_descriptor hidg_hs_in_ep_desc = { | |
88 | .bLength = USB_DT_ENDPOINT_SIZE, | |
89 | .bDescriptorType = USB_DT_ENDPOINT, | |
90 | .bEndpointAddress = USB_DIR_IN, | |
91 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
92 | /*.wMaxPacketSize = DYNAMIC */ | |
93 | .bInterval = 4, /* FIXME: Add this field in the | |
94 | * HID gadget configuration? | |
95 | * (struct hidg_func_descriptor) | |
96 | */ | |
97 | }; | |
98 | ||
99 | static struct usb_descriptor_header *hidg_hs_descriptors[] = { | |
100 | (struct usb_descriptor_header *)&hidg_interface_desc, | |
101 | (struct usb_descriptor_header *)&hidg_desc, | |
102 | (struct usb_descriptor_header *)&hidg_hs_in_ep_desc, | |
103 | NULL, | |
104 | }; | |
105 | ||
106 | /* Full-Speed Support */ | |
107 | ||
108 | static struct usb_endpoint_descriptor hidg_fs_in_ep_desc = { | |
109 | .bLength = USB_DT_ENDPOINT_SIZE, | |
110 | .bDescriptorType = USB_DT_ENDPOINT, | |
111 | .bEndpointAddress = USB_DIR_IN, | |
112 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
113 | /*.wMaxPacketSize = DYNAMIC */ | |
114 | .bInterval = 10, /* FIXME: Add this field in the | |
115 | * HID gadget configuration? | |
116 | * (struct hidg_func_descriptor) | |
117 | */ | |
118 | }; | |
119 | ||
120 | static struct usb_descriptor_header *hidg_fs_descriptors[] = { | |
121 | (struct usb_descriptor_header *)&hidg_interface_desc, | |
122 | (struct usb_descriptor_header *)&hidg_desc, | |
123 | (struct usb_descriptor_header *)&hidg_fs_in_ep_desc, | |
124 | NULL, | |
125 | }; | |
126 | ||
127 | /*-------------------------------------------------------------------------*/ | |
128 | /* Char Device */ | |
129 | ||
130 | static ssize_t f_hidg_read(struct file *file, char __user *buffer, | |
131 | size_t count, loff_t *ptr) | |
132 | { | |
fd63b10b | 133 | struct f_hidg *hidg = file->private_data; |
71adf118 FC |
134 | char *tmp_buff = NULL; |
135 | unsigned long flags; | |
136 | ||
137 | if (!count) | |
138 | return 0; | |
139 | ||
140 | if (!access_ok(VERIFY_WRITE, buffer, count)) | |
141 | return -EFAULT; | |
142 | ||
143 | spin_lock_irqsave(&hidg->spinlock, flags); | |
144 | ||
145 | #define READ_COND (hidg->set_report_buff != NULL) | |
146 | ||
147 | while (!READ_COND) { | |
148 | spin_unlock_irqrestore(&hidg->spinlock, flags); | |
149 | if (file->f_flags & O_NONBLOCK) | |
150 | return -EAGAIN; | |
151 | ||
152 | if (wait_event_interruptible(hidg->read_queue, READ_COND)) | |
153 | return -ERESTARTSYS; | |
154 | ||
155 | spin_lock_irqsave(&hidg->spinlock, flags); | |
156 | } | |
157 | ||
158 | ||
159 | count = min_t(unsigned, count, hidg->set_report_length); | |
160 | tmp_buff = hidg->set_report_buff; | |
161 | hidg->set_report_buff = NULL; | |
162 | ||
163 | spin_unlock_irqrestore(&hidg->spinlock, flags); | |
164 | ||
165 | if (tmp_buff != NULL) { | |
166 | /* copy to user outside spinlock */ | |
167 | count -= copy_to_user(buffer, tmp_buff, count); | |
168 | kfree(tmp_buff); | |
169 | } else | |
170 | count = -ENOMEM; | |
171 | ||
172 | return count; | |
173 | } | |
174 | ||
175 | static void f_hidg_req_complete(struct usb_ep *ep, struct usb_request *req) | |
176 | { | |
177 | struct f_hidg *hidg = (struct f_hidg *)ep->driver_data; | |
178 | ||
179 | if (req->status != 0) { | |
180 | ERROR(hidg->func.config->cdev, | |
181 | "End Point Request ERROR: %d\n", req->status); | |
182 | } | |
183 | ||
184 | hidg->write_pending = 0; | |
185 | wake_up(&hidg->write_queue); | |
186 | } | |
187 | ||
188 | static ssize_t f_hidg_write(struct file *file, const char __user *buffer, | |
189 | size_t count, loff_t *offp) | |
190 | { | |
fd63b10b | 191 | struct f_hidg *hidg = file->private_data; |
71adf118 FC |
192 | ssize_t status = -ENOMEM; |
193 | ||
194 | if (!access_ok(VERIFY_READ, buffer, count)) | |
195 | return -EFAULT; | |
196 | ||
197 | mutex_lock(&hidg->lock); | |
198 | ||
199 | #define WRITE_COND (!hidg->write_pending) | |
200 | ||
201 | /* write queue */ | |
202 | while (!WRITE_COND) { | |
203 | mutex_unlock(&hidg->lock); | |
204 | if (file->f_flags & O_NONBLOCK) | |
205 | return -EAGAIN; | |
206 | ||
207 | if (wait_event_interruptible_exclusive( | |
208 | hidg->write_queue, WRITE_COND)) | |
209 | return -ERESTARTSYS; | |
210 | ||
211 | mutex_lock(&hidg->lock); | |
212 | } | |
213 | ||
214 | count = min_t(unsigned, count, hidg->report_length); | |
215 | status = copy_from_user(hidg->req->buf, buffer, count); | |
216 | ||
217 | if (status != 0) { | |
218 | ERROR(hidg->func.config->cdev, | |
219 | "copy_from_user error\n"); | |
220 | mutex_unlock(&hidg->lock); | |
221 | return -EINVAL; | |
222 | } | |
223 | ||
224 | hidg->req->status = 0; | |
225 | hidg->req->zero = 0; | |
226 | hidg->req->length = count; | |
227 | hidg->req->complete = f_hidg_req_complete; | |
228 | hidg->req->context = hidg; | |
229 | hidg->write_pending = 1; | |
230 | ||
231 | status = usb_ep_queue(hidg->in_ep, hidg->req, GFP_ATOMIC); | |
232 | if (status < 0) { | |
233 | ERROR(hidg->func.config->cdev, | |
234 | "usb_ep_queue error on int endpoint %zd\n", status); | |
235 | hidg->write_pending = 0; | |
236 | wake_up(&hidg->write_queue); | |
237 | } else { | |
238 | status = count; | |
239 | } | |
240 | ||
241 | mutex_unlock(&hidg->lock); | |
242 | ||
243 | return status; | |
244 | } | |
245 | ||
246 | static unsigned int f_hidg_poll(struct file *file, poll_table *wait) | |
247 | { | |
fd63b10b | 248 | struct f_hidg *hidg = file->private_data; |
71adf118 FC |
249 | unsigned int ret = 0; |
250 | ||
251 | poll_wait(file, &hidg->read_queue, wait); | |
252 | poll_wait(file, &hidg->write_queue, wait); | |
253 | ||
254 | if (WRITE_COND) | |
255 | ret |= POLLOUT | POLLWRNORM; | |
256 | ||
257 | if (READ_COND) | |
258 | ret |= POLLIN | POLLRDNORM; | |
259 | ||
260 | return ret; | |
261 | } | |
262 | ||
263 | #undef WRITE_COND | |
264 | #undef READ_COND | |
265 | ||
266 | static int f_hidg_release(struct inode *inode, struct file *fd) | |
267 | { | |
268 | fd->private_data = NULL; | |
269 | return 0; | |
270 | } | |
271 | ||
272 | static int f_hidg_open(struct inode *inode, struct file *fd) | |
273 | { | |
274 | struct f_hidg *hidg = | |
275 | container_of(inode->i_cdev, struct f_hidg, cdev); | |
276 | ||
277 | fd->private_data = hidg; | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
282 | /*-------------------------------------------------------------------------*/ | |
283 | /* usb_function */ | |
284 | ||
285 | static void hidg_set_report_complete(struct usb_ep *ep, struct usb_request *req) | |
286 | { | |
287 | struct f_hidg *hidg = (struct f_hidg *)req->context; | |
288 | ||
289 | if (req->status != 0 || req->buf == NULL || req->actual == 0) { | |
290 | ERROR(hidg->func.config->cdev, "%s FAILED\n", __func__); | |
291 | return; | |
292 | } | |
293 | ||
294 | spin_lock(&hidg->spinlock); | |
295 | ||
296 | hidg->set_report_buff = krealloc(hidg->set_report_buff, | |
297 | req->actual, GFP_ATOMIC); | |
298 | ||
299 | if (hidg->set_report_buff == NULL) { | |
300 | spin_unlock(&hidg->spinlock); | |
301 | return; | |
302 | } | |
303 | hidg->set_report_length = req->actual; | |
304 | memcpy(hidg->set_report_buff, req->buf, req->actual); | |
305 | ||
306 | spin_unlock(&hidg->spinlock); | |
307 | ||
308 | wake_up(&hidg->read_queue); | |
71adf118 FC |
309 | } |
310 | ||
311 | static int hidg_setup(struct usb_function *f, | |
312 | const struct usb_ctrlrequest *ctrl) | |
313 | { | |
314 | struct f_hidg *hidg = func_to_hidg(f); | |
315 | struct usb_composite_dev *cdev = f->config->cdev; | |
316 | struct usb_request *req = cdev->req; | |
317 | int status = 0; | |
318 | __u16 value, length; | |
319 | ||
320 | value = __le16_to_cpu(ctrl->wValue); | |
321 | length = __le16_to_cpu(ctrl->wLength); | |
322 | ||
323 | VDBG(cdev, "hid_setup crtl_request : bRequestType:0x%x bRequest:0x%x " | |
324 | "Value:0x%x\n", ctrl->bRequestType, ctrl->bRequest, value); | |
325 | ||
326 | switch ((ctrl->bRequestType << 8) | ctrl->bRequest) { | |
327 | case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
328 | | HID_REQ_GET_REPORT): | |
329 | VDBG(cdev, "get_report\n"); | |
330 | ||
331 | /* send an empty report */ | |
332 | length = min_t(unsigned, length, hidg->report_length); | |
333 | memset(req->buf, 0x0, length); | |
334 | ||
335 | goto respond; | |
336 | break; | |
337 | ||
338 | case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
339 | | HID_REQ_GET_PROTOCOL): | |
340 | VDBG(cdev, "get_protocol\n"); | |
341 | goto stall; | |
342 | break; | |
343 | ||
344 | case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
345 | | HID_REQ_SET_REPORT): | |
346 | VDBG(cdev, "set_report | wLenght=%d\n", ctrl->wLength); | |
347 | req->context = hidg; | |
348 | req->complete = hidg_set_report_complete; | |
349 | goto respond; | |
350 | break; | |
351 | ||
352 | case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
353 | | HID_REQ_SET_PROTOCOL): | |
354 | VDBG(cdev, "set_protocol\n"); | |
355 | goto stall; | |
356 | break; | |
357 | ||
358 | case ((USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_INTERFACE) << 8 | |
359 | | USB_REQ_GET_DESCRIPTOR): | |
360 | switch (value >> 8) { | |
c240d78a SB |
361 | case HID_DT_HID: |
362 | VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: HID\n"); | |
363 | length = min_t(unsigned short, length, | |
364 | hidg_desc.bLength); | |
365 | memcpy(req->buf, &hidg_desc, length); | |
366 | goto respond; | |
367 | break; | |
71adf118 FC |
368 | case HID_DT_REPORT: |
369 | VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: REPORT\n"); | |
370 | length = min_t(unsigned short, length, | |
371 | hidg->report_desc_length); | |
372 | memcpy(req->buf, hidg->report_desc, length); | |
373 | goto respond; | |
374 | break; | |
375 | ||
376 | default: | |
377 | VDBG(cdev, "Unknown decriptor request 0x%x\n", | |
378 | value >> 8); | |
379 | goto stall; | |
380 | break; | |
381 | } | |
382 | break; | |
383 | ||
384 | default: | |
385 | VDBG(cdev, "Unknown request 0x%x\n", | |
386 | ctrl->bRequest); | |
387 | goto stall; | |
388 | break; | |
389 | } | |
390 | ||
391 | stall: | |
392 | return -EOPNOTSUPP; | |
393 | ||
394 | respond: | |
395 | req->zero = 0; | |
396 | req->length = length; | |
397 | status = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); | |
398 | if (status < 0) | |
399 | ERROR(cdev, "usb_ep_queue error on ep0 %d\n", value); | |
400 | return status; | |
401 | } | |
402 | ||
403 | static void hidg_disable(struct usb_function *f) | |
404 | { | |
405 | struct f_hidg *hidg = func_to_hidg(f); | |
406 | ||
407 | usb_ep_disable(hidg->in_ep); | |
408 | hidg->in_ep->driver_data = NULL; | |
71adf118 FC |
409 | } |
410 | ||
411 | static int hidg_set_alt(struct usb_function *f, unsigned intf, unsigned alt) | |
412 | { | |
413 | struct usb_composite_dev *cdev = f->config->cdev; | |
414 | struct f_hidg *hidg = func_to_hidg(f); | |
71adf118 FC |
415 | int status = 0; |
416 | ||
417 | VDBG(cdev, "hidg_set_alt intf:%d alt:%d\n", intf, alt); | |
418 | ||
419 | if (hidg->in_ep != NULL) { | |
420 | /* restart endpoint */ | |
421 | if (hidg->in_ep->driver_data != NULL) | |
422 | usb_ep_disable(hidg->in_ep); | |
423 | ||
ea2a1df7 TB |
424 | status = config_ep_by_speed(f->config->cdev->gadget, f, |
425 | hidg->in_ep); | |
426 | if (status) { | |
427 | ERROR(cdev, "config_ep_by_speed FAILED!\n"); | |
428 | goto fail; | |
429 | } | |
72c973dd | 430 | status = usb_ep_enable(hidg->in_ep); |
71adf118 FC |
431 | if (status < 0) { |
432 | ERROR(cdev, "Enable endpoint FAILED!\n"); | |
433 | goto fail; | |
434 | } | |
435 | hidg->in_ep->driver_data = hidg; | |
436 | } | |
437 | fail: | |
438 | return status; | |
439 | } | |
440 | ||
441 | const struct file_operations f_hidg_fops = { | |
442 | .owner = THIS_MODULE, | |
443 | .open = f_hidg_open, | |
444 | .release = f_hidg_release, | |
445 | .write = f_hidg_write, | |
446 | .read = f_hidg_read, | |
447 | .poll = f_hidg_poll, | |
6038f373 | 448 | .llseek = noop_llseek, |
71adf118 FC |
449 | }; |
450 | ||
451 | static int __init hidg_bind(struct usb_configuration *c, struct usb_function *f) | |
452 | { | |
453 | struct usb_ep *ep; | |
454 | struct f_hidg *hidg = func_to_hidg(f); | |
455 | int status; | |
456 | dev_t dev; | |
457 | ||
458 | /* allocate instance-specific interface IDs, and patch descriptors */ | |
459 | status = usb_interface_id(c, f); | |
460 | if (status < 0) | |
461 | goto fail; | |
462 | hidg_interface_desc.bInterfaceNumber = status; | |
463 | ||
464 | ||
465 | /* allocate instance-specific endpoints */ | |
466 | status = -ENODEV; | |
467 | ep = usb_ep_autoconfig(c->cdev->gadget, &hidg_fs_in_ep_desc); | |
468 | if (!ep) | |
469 | goto fail; | |
470 | ep->driver_data = c->cdev; /* claim */ | |
471 | hidg->in_ep = ep; | |
472 | ||
473 | /* preallocate request and buffer */ | |
474 | status = -ENOMEM; | |
475 | hidg->req = usb_ep_alloc_request(hidg->in_ep, GFP_KERNEL); | |
476 | if (!hidg->req) | |
477 | goto fail; | |
478 | ||
479 | ||
480 | hidg->req->buf = kmalloc(hidg->report_length, GFP_KERNEL); | |
481 | if (!hidg->req->buf) | |
482 | goto fail; | |
483 | ||
484 | /* set descriptor dynamic values */ | |
485 | hidg_interface_desc.bInterfaceSubClass = hidg->bInterfaceSubClass; | |
486 | hidg_interface_desc.bInterfaceProtocol = hidg->bInterfaceProtocol; | |
487 | hidg_hs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); | |
488 | hidg_fs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); | |
489 | hidg_desc.desc[0].bDescriptorType = HID_DT_REPORT; | |
490 | hidg_desc.desc[0].wDescriptorLength = | |
491 | cpu_to_le16(hidg->report_desc_length); | |
492 | ||
493 | hidg->set_report_buff = NULL; | |
494 | ||
495 | /* copy descriptors */ | |
496 | f->descriptors = usb_copy_descriptors(hidg_fs_descriptors); | |
497 | if (!f->descriptors) | |
498 | goto fail; | |
499 | ||
71adf118 FC |
500 | if (gadget_is_dualspeed(c->cdev->gadget)) { |
501 | hidg_hs_in_ep_desc.bEndpointAddress = | |
502 | hidg_fs_in_ep_desc.bEndpointAddress; | |
503 | f->hs_descriptors = usb_copy_descriptors(hidg_hs_descriptors); | |
504 | if (!f->hs_descriptors) | |
505 | goto fail; | |
71adf118 FC |
506 | } |
507 | ||
508 | mutex_init(&hidg->lock); | |
509 | spin_lock_init(&hidg->spinlock); | |
510 | init_waitqueue_head(&hidg->write_queue); | |
511 | init_waitqueue_head(&hidg->read_queue); | |
512 | ||
513 | /* create char device */ | |
514 | cdev_init(&hidg->cdev, &f_hidg_fops); | |
515 | dev = MKDEV(major, hidg->minor); | |
516 | status = cdev_add(&hidg->cdev, dev, 1); | |
517 | if (status) | |
518 | goto fail; | |
519 | ||
520 | device_create(hidg_class, NULL, dev, NULL, "%s%d", "hidg", hidg->minor); | |
521 | ||
522 | return 0; | |
523 | ||
524 | fail: | |
525 | ERROR(f->config->cdev, "hidg_bind FAILED\n"); | |
526 | if (hidg->req != NULL) { | |
527 | kfree(hidg->req->buf); | |
528 | if (hidg->in_ep != NULL) | |
529 | usb_ep_free_request(hidg->in_ep, hidg->req); | |
530 | } | |
531 | ||
532 | usb_free_descriptors(f->hs_descriptors); | |
533 | usb_free_descriptors(f->descriptors); | |
534 | ||
535 | return status; | |
536 | } | |
537 | ||
538 | static void hidg_unbind(struct usb_configuration *c, struct usb_function *f) | |
539 | { | |
540 | struct f_hidg *hidg = func_to_hidg(f); | |
541 | ||
542 | device_destroy(hidg_class, MKDEV(major, hidg->minor)); | |
543 | cdev_del(&hidg->cdev); | |
544 | ||
545 | /* disable/free request and end point */ | |
546 | usb_ep_disable(hidg->in_ep); | |
547 | usb_ep_dequeue(hidg->in_ep, hidg->req); | |
548 | kfree(hidg->req->buf); | |
549 | usb_ep_free_request(hidg->in_ep, hidg->req); | |
550 | ||
551 | /* free descriptors copies */ | |
552 | usb_free_descriptors(f->hs_descriptors); | |
553 | usb_free_descriptors(f->descriptors); | |
554 | ||
555 | kfree(hidg->report_desc); | |
556 | kfree(hidg->set_report_buff); | |
557 | kfree(hidg); | |
558 | } | |
559 | ||
560 | /*-------------------------------------------------------------------------*/ | |
561 | /* Strings */ | |
562 | ||
563 | #define CT_FUNC_HID_IDX 0 | |
564 | ||
565 | static struct usb_string ct_func_string_defs[] = { | |
566 | [CT_FUNC_HID_IDX].s = "HID Interface", | |
567 | {}, /* end of list */ | |
568 | }; | |
569 | ||
570 | static struct usb_gadget_strings ct_func_string_table = { | |
571 | .language = 0x0409, /* en-US */ | |
572 | .strings = ct_func_string_defs, | |
573 | }; | |
574 | ||
575 | static struct usb_gadget_strings *ct_func_strings[] = { | |
576 | &ct_func_string_table, | |
577 | NULL, | |
578 | }; | |
579 | ||
580 | /*-------------------------------------------------------------------------*/ | |
581 | /* usb_configuration */ | |
582 | ||
583 | int __init hidg_bind_config(struct usb_configuration *c, | |
584 | struct hidg_func_descriptor *fdesc, int index) | |
585 | { | |
586 | struct f_hidg *hidg; | |
587 | int status; | |
588 | ||
589 | if (index >= minors) | |
590 | return -ENOENT; | |
591 | ||
592 | /* maybe allocate device-global string IDs, and patch descriptors */ | |
593 | if (ct_func_string_defs[CT_FUNC_HID_IDX].id == 0) { | |
594 | status = usb_string_id(c->cdev); | |
595 | if (status < 0) | |
596 | return status; | |
597 | ct_func_string_defs[CT_FUNC_HID_IDX].id = status; | |
598 | hidg_interface_desc.iInterface = status; | |
599 | } | |
600 | ||
601 | /* allocate and initialize one new instance */ | |
602 | hidg = kzalloc(sizeof *hidg, GFP_KERNEL); | |
603 | if (!hidg) | |
604 | return -ENOMEM; | |
605 | ||
606 | hidg->minor = index; | |
607 | hidg->bInterfaceSubClass = fdesc->subclass; | |
608 | hidg->bInterfaceProtocol = fdesc->protocol; | |
609 | hidg->report_length = fdesc->report_length; | |
610 | hidg->report_desc_length = fdesc->report_desc_length; | |
611 | hidg->report_desc = kmemdup(fdesc->report_desc, | |
612 | fdesc->report_desc_length, | |
613 | GFP_KERNEL); | |
614 | if (!hidg->report_desc) { | |
615 | kfree(hidg); | |
616 | return -ENOMEM; | |
617 | } | |
618 | ||
619 | hidg->func.name = "hid"; | |
620 | hidg->func.strings = ct_func_strings; | |
621 | hidg->func.bind = hidg_bind; | |
622 | hidg->func.unbind = hidg_unbind; | |
623 | hidg->func.set_alt = hidg_set_alt; | |
624 | hidg->func.disable = hidg_disable; | |
625 | hidg->func.setup = hidg_setup; | |
626 | ||
627 | status = usb_add_function(c, &hidg->func); | |
628 | if (status) | |
629 | kfree(hidg); | |
630 | ||
631 | return status; | |
632 | } | |
633 | ||
634 | int __init ghid_setup(struct usb_gadget *g, int count) | |
635 | { | |
636 | int status; | |
637 | dev_t dev; | |
638 | ||
639 | hidg_class = class_create(THIS_MODULE, "hidg"); | |
640 | ||
641 | status = alloc_chrdev_region(&dev, 0, count, "hidg"); | |
642 | if (!status) { | |
643 | major = MAJOR(dev); | |
644 | minors = count; | |
645 | } | |
646 | ||
647 | return status; | |
648 | } | |
649 | ||
650 | void ghid_cleanup(void) | |
651 | { | |
652 | if (major) { | |
653 | unregister_chrdev_region(MKDEV(major, 0), minors); | |
654 | major = minors = 0; | |
655 | } | |
656 | ||
657 | class_destroy(hidg_class); | |
658 | hidg_class = NULL; | |
659 | } |