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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. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | */ | |
20 | ||
21 | #include <linux/kernel.h> | |
22 | #include <linux/utsname.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/hid.h> | |
25 | #include <linux/cdev.h> | |
26 | #include <linux/mutex.h> | |
27 | #include <linux/poll.h> | |
28 | #include <linux/smp_lock.h> | |
29 | #include <linux/uaccess.h> | |
30 | #include <linux/wait.h> | |
31 | #include <linux/usb/g_hid.h> | |
32 | ||
33 | static int major, minors; | |
34 | static struct class *hidg_class; | |
35 | ||
36 | /*-------------------------------------------------------------------------*/ | |
37 | /* HID gadget struct */ | |
38 | ||
39 | struct f_hidg { | |
40 | /* configuration */ | |
41 | unsigned char bInterfaceSubClass; | |
42 | unsigned char bInterfaceProtocol; | |
43 | unsigned short report_desc_length; | |
44 | char *report_desc; | |
45 | unsigned short report_length; | |
46 | ||
47 | /* recv report */ | |
48 | char *set_report_buff; | |
49 | unsigned short set_report_length; | |
50 | spinlock_t spinlock; | |
51 | wait_queue_head_t read_queue; | |
52 | ||
53 | /* send report */ | |
54 | struct mutex lock; | |
55 | bool write_pending; | |
56 | wait_queue_head_t write_queue; | |
57 | struct usb_request *req; | |
58 | ||
59 | int minor; | |
60 | struct cdev cdev; | |
61 | struct usb_function func; | |
62 | struct usb_ep *in_ep; | |
63 | struct usb_endpoint_descriptor *fs_in_ep_desc; | |
64 | struct usb_endpoint_descriptor *hs_in_ep_desc; | |
65 | }; | |
66 | ||
67 | static inline struct f_hidg *func_to_hidg(struct usb_function *f) | |
68 | { | |
69 | return container_of(f, struct f_hidg, func); | |
70 | } | |
71 | ||
72 | /*-------------------------------------------------------------------------*/ | |
73 | /* Static descriptors */ | |
74 | ||
75 | static struct usb_interface_descriptor hidg_interface_desc = { | |
76 | .bLength = sizeof hidg_interface_desc, | |
77 | .bDescriptorType = USB_DT_INTERFACE, | |
78 | /* .bInterfaceNumber = DYNAMIC */ | |
79 | .bAlternateSetting = 0, | |
80 | .bNumEndpoints = 1, | |
81 | .bInterfaceClass = USB_CLASS_HID, | |
82 | /* .bInterfaceSubClass = DYNAMIC */ | |
83 | /* .bInterfaceProtocol = DYNAMIC */ | |
84 | /* .iInterface = DYNAMIC */ | |
85 | }; | |
86 | ||
87 | static struct hid_descriptor hidg_desc = { | |
88 | .bLength = sizeof hidg_desc, | |
89 | .bDescriptorType = HID_DT_HID, | |
90 | .bcdHID = 0x0101, | |
91 | .bCountryCode = 0x00, | |
92 | .bNumDescriptors = 0x1, | |
93 | /*.desc[0].bDescriptorType = DYNAMIC */ | |
94 | /*.desc[0].wDescriptorLenght = DYNAMIC */ | |
95 | }; | |
96 | ||
97 | /* High-Speed Support */ | |
98 | ||
99 | static struct usb_endpoint_descriptor hidg_hs_in_ep_desc = { | |
100 | .bLength = USB_DT_ENDPOINT_SIZE, | |
101 | .bDescriptorType = USB_DT_ENDPOINT, | |
102 | .bEndpointAddress = USB_DIR_IN, | |
103 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
104 | /*.wMaxPacketSize = DYNAMIC */ | |
105 | .bInterval = 4, /* FIXME: Add this field in the | |
106 | * HID gadget configuration? | |
107 | * (struct hidg_func_descriptor) | |
108 | */ | |
109 | }; | |
110 | ||
111 | static struct usb_descriptor_header *hidg_hs_descriptors[] = { | |
112 | (struct usb_descriptor_header *)&hidg_interface_desc, | |
113 | (struct usb_descriptor_header *)&hidg_desc, | |
114 | (struct usb_descriptor_header *)&hidg_hs_in_ep_desc, | |
115 | NULL, | |
116 | }; | |
117 | ||
118 | /* Full-Speed Support */ | |
119 | ||
120 | static struct usb_endpoint_descriptor hidg_fs_in_ep_desc = { | |
121 | .bLength = USB_DT_ENDPOINT_SIZE, | |
122 | .bDescriptorType = USB_DT_ENDPOINT, | |
123 | .bEndpointAddress = USB_DIR_IN, | |
124 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
125 | /*.wMaxPacketSize = DYNAMIC */ | |
126 | .bInterval = 10, /* FIXME: Add this field in the | |
127 | * HID gadget configuration? | |
128 | * (struct hidg_func_descriptor) | |
129 | */ | |
130 | }; | |
131 | ||
132 | static struct usb_descriptor_header *hidg_fs_descriptors[] = { | |
133 | (struct usb_descriptor_header *)&hidg_interface_desc, | |
134 | (struct usb_descriptor_header *)&hidg_desc, | |
135 | (struct usb_descriptor_header *)&hidg_fs_in_ep_desc, | |
136 | NULL, | |
137 | }; | |
138 | ||
139 | /*-------------------------------------------------------------------------*/ | |
140 | /* Char Device */ | |
141 | ||
142 | static ssize_t f_hidg_read(struct file *file, char __user *buffer, | |
143 | size_t count, loff_t *ptr) | |
144 | { | |
fd63b10b | 145 | struct f_hidg *hidg = file->private_data; |
71adf118 FC |
146 | char *tmp_buff = NULL; |
147 | unsigned long flags; | |
148 | ||
149 | if (!count) | |
150 | return 0; | |
151 | ||
152 | if (!access_ok(VERIFY_WRITE, buffer, count)) | |
153 | return -EFAULT; | |
154 | ||
155 | spin_lock_irqsave(&hidg->spinlock, flags); | |
156 | ||
157 | #define READ_COND (hidg->set_report_buff != NULL) | |
158 | ||
159 | while (!READ_COND) { | |
160 | spin_unlock_irqrestore(&hidg->spinlock, flags); | |
161 | if (file->f_flags & O_NONBLOCK) | |
162 | return -EAGAIN; | |
163 | ||
164 | if (wait_event_interruptible(hidg->read_queue, READ_COND)) | |
165 | return -ERESTARTSYS; | |
166 | ||
167 | spin_lock_irqsave(&hidg->spinlock, flags); | |
168 | } | |
169 | ||
170 | ||
171 | count = min_t(unsigned, count, hidg->set_report_length); | |
172 | tmp_buff = hidg->set_report_buff; | |
173 | hidg->set_report_buff = NULL; | |
174 | ||
175 | spin_unlock_irqrestore(&hidg->spinlock, flags); | |
176 | ||
177 | if (tmp_buff != NULL) { | |
178 | /* copy to user outside spinlock */ | |
179 | count -= copy_to_user(buffer, tmp_buff, count); | |
180 | kfree(tmp_buff); | |
181 | } else | |
182 | count = -ENOMEM; | |
183 | ||
184 | return count; | |
185 | } | |
186 | ||
187 | static void f_hidg_req_complete(struct usb_ep *ep, struct usb_request *req) | |
188 | { | |
189 | struct f_hidg *hidg = (struct f_hidg *)ep->driver_data; | |
190 | ||
191 | if (req->status != 0) { | |
192 | ERROR(hidg->func.config->cdev, | |
193 | "End Point Request ERROR: %d\n", req->status); | |
194 | } | |
195 | ||
196 | hidg->write_pending = 0; | |
197 | wake_up(&hidg->write_queue); | |
198 | } | |
199 | ||
200 | static ssize_t f_hidg_write(struct file *file, const char __user *buffer, | |
201 | size_t count, loff_t *offp) | |
202 | { | |
fd63b10b | 203 | struct f_hidg *hidg = file->private_data; |
71adf118 FC |
204 | ssize_t status = -ENOMEM; |
205 | ||
206 | if (!access_ok(VERIFY_READ, buffer, count)) | |
207 | return -EFAULT; | |
208 | ||
209 | mutex_lock(&hidg->lock); | |
210 | ||
211 | #define WRITE_COND (!hidg->write_pending) | |
212 | ||
213 | /* write queue */ | |
214 | while (!WRITE_COND) { | |
215 | mutex_unlock(&hidg->lock); | |
216 | if (file->f_flags & O_NONBLOCK) | |
217 | return -EAGAIN; | |
218 | ||
219 | if (wait_event_interruptible_exclusive( | |
220 | hidg->write_queue, WRITE_COND)) | |
221 | return -ERESTARTSYS; | |
222 | ||
223 | mutex_lock(&hidg->lock); | |
224 | } | |
225 | ||
226 | count = min_t(unsigned, count, hidg->report_length); | |
227 | status = copy_from_user(hidg->req->buf, buffer, count); | |
228 | ||
229 | if (status != 0) { | |
230 | ERROR(hidg->func.config->cdev, | |
231 | "copy_from_user error\n"); | |
232 | mutex_unlock(&hidg->lock); | |
233 | return -EINVAL; | |
234 | } | |
235 | ||
236 | hidg->req->status = 0; | |
237 | hidg->req->zero = 0; | |
238 | hidg->req->length = count; | |
239 | hidg->req->complete = f_hidg_req_complete; | |
240 | hidg->req->context = hidg; | |
241 | hidg->write_pending = 1; | |
242 | ||
243 | status = usb_ep_queue(hidg->in_ep, hidg->req, GFP_ATOMIC); | |
244 | if (status < 0) { | |
245 | ERROR(hidg->func.config->cdev, | |
246 | "usb_ep_queue error on int endpoint %zd\n", status); | |
247 | hidg->write_pending = 0; | |
248 | wake_up(&hidg->write_queue); | |
249 | } else { | |
250 | status = count; | |
251 | } | |
252 | ||
253 | mutex_unlock(&hidg->lock); | |
254 | ||
255 | return status; | |
256 | } | |
257 | ||
258 | static unsigned int f_hidg_poll(struct file *file, poll_table *wait) | |
259 | { | |
fd63b10b | 260 | struct f_hidg *hidg = file->private_data; |
71adf118 FC |
261 | unsigned int ret = 0; |
262 | ||
263 | poll_wait(file, &hidg->read_queue, wait); | |
264 | poll_wait(file, &hidg->write_queue, wait); | |
265 | ||
266 | if (WRITE_COND) | |
267 | ret |= POLLOUT | POLLWRNORM; | |
268 | ||
269 | if (READ_COND) | |
270 | ret |= POLLIN | POLLRDNORM; | |
271 | ||
272 | return ret; | |
273 | } | |
274 | ||
275 | #undef WRITE_COND | |
276 | #undef READ_COND | |
277 | ||
278 | static int f_hidg_release(struct inode *inode, struct file *fd) | |
279 | { | |
280 | fd->private_data = NULL; | |
281 | return 0; | |
282 | } | |
283 | ||
284 | static int f_hidg_open(struct inode *inode, struct file *fd) | |
285 | { | |
286 | struct f_hidg *hidg = | |
287 | container_of(inode->i_cdev, struct f_hidg, cdev); | |
288 | ||
289 | fd->private_data = hidg; | |
290 | ||
291 | return 0; | |
292 | } | |
293 | ||
294 | /*-------------------------------------------------------------------------*/ | |
295 | /* usb_function */ | |
296 | ||
297 | static void hidg_set_report_complete(struct usb_ep *ep, struct usb_request *req) | |
298 | { | |
299 | struct f_hidg *hidg = (struct f_hidg *)req->context; | |
300 | ||
301 | if (req->status != 0 || req->buf == NULL || req->actual == 0) { | |
302 | ERROR(hidg->func.config->cdev, "%s FAILED\n", __func__); | |
303 | return; | |
304 | } | |
305 | ||
306 | spin_lock(&hidg->spinlock); | |
307 | ||
308 | hidg->set_report_buff = krealloc(hidg->set_report_buff, | |
309 | req->actual, GFP_ATOMIC); | |
310 | ||
311 | if (hidg->set_report_buff == NULL) { | |
312 | spin_unlock(&hidg->spinlock); | |
313 | return; | |
314 | } | |
315 | hidg->set_report_length = req->actual; | |
316 | memcpy(hidg->set_report_buff, req->buf, req->actual); | |
317 | ||
318 | spin_unlock(&hidg->spinlock); | |
319 | ||
320 | wake_up(&hidg->read_queue); | |
321 | ||
322 | return; | |
323 | } | |
324 | ||
325 | static int hidg_setup(struct usb_function *f, | |
326 | const struct usb_ctrlrequest *ctrl) | |
327 | { | |
328 | struct f_hidg *hidg = func_to_hidg(f); | |
329 | struct usb_composite_dev *cdev = f->config->cdev; | |
330 | struct usb_request *req = cdev->req; | |
331 | int status = 0; | |
332 | __u16 value, length; | |
333 | ||
334 | value = __le16_to_cpu(ctrl->wValue); | |
335 | length = __le16_to_cpu(ctrl->wLength); | |
336 | ||
337 | VDBG(cdev, "hid_setup crtl_request : bRequestType:0x%x bRequest:0x%x " | |
338 | "Value:0x%x\n", ctrl->bRequestType, ctrl->bRequest, value); | |
339 | ||
340 | switch ((ctrl->bRequestType << 8) | ctrl->bRequest) { | |
341 | case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
342 | | HID_REQ_GET_REPORT): | |
343 | VDBG(cdev, "get_report\n"); | |
344 | ||
345 | /* send an empty report */ | |
346 | length = min_t(unsigned, length, hidg->report_length); | |
347 | memset(req->buf, 0x0, length); | |
348 | ||
349 | goto respond; | |
350 | break; | |
351 | ||
352 | case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
353 | | HID_REQ_GET_PROTOCOL): | |
354 | VDBG(cdev, "get_protocol\n"); | |
355 | goto stall; | |
356 | break; | |
357 | ||
358 | case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
359 | | HID_REQ_SET_REPORT): | |
360 | VDBG(cdev, "set_report | wLenght=%d\n", ctrl->wLength); | |
361 | req->context = hidg; | |
362 | req->complete = hidg_set_report_complete; | |
363 | goto respond; | |
364 | break; | |
365 | ||
366 | case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
367 | | HID_REQ_SET_PROTOCOL): | |
368 | VDBG(cdev, "set_protocol\n"); | |
369 | goto stall; | |
370 | break; | |
371 | ||
372 | case ((USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_INTERFACE) << 8 | |
373 | | USB_REQ_GET_DESCRIPTOR): | |
374 | switch (value >> 8) { | |
375 | case HID_DT_REPORT: | |
376 | VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: REPORT\n"); | |
377 | length = min_t(unsigned short, length, | |
378 | hidg->report_desc_length); | |
379 | memcpy(req->buf, hidg->report_desc, length); | |
380 | goto respond; | |
381 | break; | |
382 | ||
383 | default: | |
384 | VDBG(cdev, "Unknown decriptor request 0x%x\n", | |
385 | value >> 8); | |
386 | goto stall; | |
387 | break; | |
388 | } | |
389 | break; | |
390 | ||
391 | default: | |
392 | VDBG(cdev, "Unknown request 0x%x\n", | |
393 | ctrl->bRequest); | |
394 | goto stall; | |
395 | break; | |
396 | } | |
397 | ||
398 | stall: | |
399 | return -EOPNOTSUPP; | |
400 | ||
401 | respond: | |
402 | req->zero = 0; | |
403 | req->length = length; | |
404 | status = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); | |
405 | if (status < 0) | |
406 | ERROR(cdev, "usb_ep_queue error on ep0 %d\n", value); | |
407 | return status; | |
408 | } | |
409 | ||
410 | static void hidg_disable(struct usb_function *f) | |
411 | { | |
412 | struct f_hidg *hidg = func_to_hidg(f); | |
413 | ||
414 | usb_ep_disable(hidg->in_ep); | |
415 | hidg->in_ep->driver_data = NULL; | |
416 | ||
417 | return; | |
418 | } | |
419 | ||
420 | static int hidg_set_alt(struct usb_function *f, unsigned intf, unsigned alt) | |
421 | { | |
422 | struct usb_composite_dev *cdev = f->config->cdev; | |
423 | struct f_hidg *hidg = func_to_hidg(f); | |
424 | const struct usb_endpoint_descriptor *ep_desc; | |
425 | int status = 0; | |
426 | ||
427 | VDBG(cdev, "hidg_set_alt intf:%d alt:%d\n", intf, alt); | |
428 | ||
429 | if (hidg->in_ep != NULL) { | |
430 | /* restart endpoint */ | |
431 | if (hidg->in_ep->driver_data != NULL) | |
432 | usb_ep_disable(hidg->in_ep); | |
433 | ||
434 | ep_desc = ep_choose(f->config->cdev->gadget, | |
435 | hidg->hs_in_ep_desc, hidg->fs_in_ep_desc); | |
436 | status = usb_ep_enable(hidg->in_ep, ep_desc); | |
437 | if (status < 0) { | |
438 | ERROR(cdev, "Enable endpoint FAILED!\n"); | |
439 | goto fail; | |
440 | } | |
441 | hidg->in_ep->driver_data = hidg; | |
442 | } | |
443 | fail: | |
444 | return status; | |
445 | } | |
446 | ||
447 | const struct file_operations f_hidg_fops = { | |
448 | .owner = THIS_MODULE, | |
449 | .open = f_hidg_open, | |
450 | .release = f_hidg_release, | |
451 | .write = f_hidg_write, | |
452 | .read = f_hidg_read, | |
453 | .poll = f_hidg_poll, | |
454 | }; | |
455 | ||
456 | static int __init hidg_bind(struct usb_configuration *c, struct usb_function *f) | |
457 | { | |
458 | struct usb_ep *ep; | |
459 | struct f_hidg *hidg = func_to_hidg(f); | |
460 | int status; | |
461 | dev_t dev; | |
462 | ||
463 | /* allocate instance-specific interface IDs, and patch descriptors */ | |
464 | status = usb_interface_id(c, f); | |
465 | if (status < 0) | |
466 | goto fail; | |
467 | hidg_interface_desc.bInterfaceNumber = status; | |
468 | ||
469 | ||
470 | /* allocate instance-specific endpoints */ | |
471 | status = -ENODEV; | |
472 | ep = usb_ep_autoconfig(c->cdev->gadget, &hidg_fs_in_ep_desc); | |
473 | if (!ep) | |
474 | goto fail; | |
475 | ep->driver_data = c->cdev; /* claim */ | |
476 | hidg->in_ep = ep; | |
477 | ||
478 | /* preallocate request and buffer */ | |
479 | status = -ENOMEM; | |
480 | hidg->req = usb_ep_alloc_request(hidg->in_ep, GFP_KERNEL); | |
481 | if (!hidg->req) | |
482 | goto fail; | |
483 | ||
484 | ||
485 | hidg->req->buf = kmalloc(hidg->report_length, GFP_KERNEL); | |
486 | if (!hidg->req->buf) | |
487 | goto fail; | |
488 | ||
489 | /* set descriptor dynamic values */ | |
490 | hidg_interface_desc.bInterfaceSubClass = hidg->bInterfaceSubClass; | |
491 | hidg_interface_desc.bInterfaceProtocol = hidg->bInterfaceProtocol; | |
492 | hidg_hs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); | |
493 | hidg_fs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); | |
494 | hidg_desc.desc[0].bDescriptorType = HID_DT_REPORT; | |
495 | hidg_desc.desc[0].wDescriptorLength = | |
496 | cpu_to_le16(hidg->report_desc_length); | |
497 | ||
498 | hidg->set_report_buff = NULL; | |
499 | ||
500 | /* copy descriptors */ | |
501 | f->descriptors = usb_copy_descriptors(hidg_fs_descriptors); | |
502 | if (!f->descriptors) | |
503 | goto fail; | |
504 | ||
505 | hidg->fs_in_ep_desc = usb_find_endpoint(hidg_fs_descriptors, | |
506 | f->descriptors, | |
507 | &hidg_fs_in_ep_desc); | |
508 | ||
509 | if (gadget_is_dualspeed(c->cdev->gadget)) { | |
510 | hidg_hs_in_ep_desc.bEndpointAddress = | |
511 | hidg_fs_in_ep_desc.bEndpointAddress; | |
512 | f->hs_descriptors = usb_copy_descriptors(hidg_hs_descriptors); | |
513 | if (!f->hs_descriptors) | |
514 | goto fail; | |
515 | hidg->hs_in_ep_desc = usb_find_endpoint(hidg_hs_descriptors, | |
516 | f->hs_descriptors, | |
517 | &hidg_hs_in_ep_desc); | |
518 | } else { | |
519 | hidg->hs_in_ep_desc = NULL; | |
520 | } | |
521 | ||
522 | mutex_init(&hidg->lock); | |
523 | spin_lock_init(&hidg->spinlock); | |
524 | init_waitqueue_head(&hidg->write_queue); | |
525 | init_waitqueue_head(&hidg->read_queue); | |
526 | ||
527 | /* create char device */ | |
528 | cdev_init(&hidg->cdev, &f_hidg_fops); | |
529 | dev = MKDEV(major, hidg->minor); | |
530 | status = cdev_add(&hidg->cdev, dev, 1); | |
531 | if (status) | |
532 | goto fail; | |
533 | ||
534 | device_create(hidg_class, NULL, dev, NULL, "%s%d", "hidg", hidg->minor); | |
535 | ||
536 | return 0; | |
537 | ||
538 | fail: | |
539 | ERROR(f->config->cdev, "hidg_bind FAILED\n"); | |
540 | if (hidg->req != NULL) { | |
541 | kfree(hidg->req->buf); | |
542 | if (hidg->in_ep != NULL) | |
543 | usb_ep_free_request(hidg->in_ep, hidg->req); | |
544 | } | |
545 | ||
546 | usb_free_descriptors(f->hs_descriptors); | |
547 | usb_free_descriptors(f->descriptors); | |
548 | ||
549 | return status; | |
550 | } | |
551 | ||
552 | static void hidg_unbind(struct usb_configuration *c, struct usb_function *f) | |
553 | { | |
554 | struct f_hidg *hidg = func_to_hidg(f); | |
555 | ||
556 | device_destroy(hidg_class, MKDEV(major, hidg->minor)); | |
557 | cdev_del(&hidg->cdev); | |
558 | ||
559 | /* disable/free request and end point */ | |
560 | usb_ep_disable(hidg->in_ep); | |
561 | usb_ep_dequeue(hidg->in_ep, hidg->req); | |
562 | kfree(hidg->req->buf); | |
563 | usb_ep_free_request(hidg->in_ep, hidg->req); | |
564 | ||
565 | /* free descriptors copies */ | |
566 | usb_free_descriptors(f->hs_descriptors); | |
567 | usb_free_descriptors(f->descriptors); | |
568 | ||
569 | kfree(hidg->report_desc); | |
570 | kfree(hidg->set_report_buff); | |
571 | kfree(hidg); | |
572 | } | |
573 | ||
574 | /*-------------------------------------------------------------------------*/ | |
575 | /* Strings */ | |
576 | ||
577 | #define CT_FUNC_HID_IDX 0 | |
578 | ||
579 | static struct usb_string ct_func_string_defs[] = { | |
580 | [CT_FUNC_HID_IDX].s = "HID Interface", | |
581 | {}, /* end of list */ | |
582 | }; | |
583 | ||
584 | static struct usb_gadget_strings ct_func_string_table = { | |
585 | .language = 0x0409, /* en-US */ | |
586 | .strings = ct_func_string_defs, | |
587 | }; | |
588 | ||
589 | static struct usb_gadget_strings *ct_func_strings[] = { | |
590 | &ct_func_string_table, | |
591 | NULL, | |
592 | }; | |
593 | ||
594 | /*-------------------------------------------------------------------------*/ | |
595 | /* usb_configuration */ | |
596 | ||
597 | int __init hidg_bind_config(struct usb_configuration *c, | |
598 | struct hidg_func_descriptor *fdesc, int index) | |
599 | { | |
600 | struct f_hidg *hidg; | |
601 | int status; | |
602 | ||
603 | if (index >= minors) | |
604 | return -ENOENT; | |
605 | ||
606 | /* maybe allocate device-global string IDs, and patch descriptors */ | |
607 | if (ct_func_string_defs[CT_FUNC_HID_IDX].id == 0) { | |
608 | status = usb_string_id(c->cdev); | |
609 | if (status < 0) | |
610 | return status; | |
611 | ct_func_string_defs[CT_FUNC_HID_IDX].id = status; | |
612 | hidg_interface_desc.iInterface = status; | |
613 | } | |
614 | ||
615 | /* allocate and initialize one new instance */ | |
616 | hidg = kzalloc(sizeof *hidg, GFP_KERNEL); | |
617 | if (!hidg) | |
618 | return -ENOMEM; | |
619 | ||
620 | hidg->minor = index; | |
621 | hidg->bInterfaceSubClass = fdesc->subclass; | |
622 | hidg->bInterfaceProtocol = fdesc->protocol; | |
623 | hidg->report_length = fdesc->report_length; | |
624 | hidg->report_desc_length = fdesc->report_desc_length; | |
625 | hidg->report_desc = kmemdup(fdesc->report_desc, | |
626 | fdesc->report_desc_length, | |
627 | GFP_KERNEL); | |
628 | if (!hidg->report_desc) { | |
629 | kfree(hidg); | |
630 | return -ENOMEM; | |
631 | } | |
632 | ||
633 | hidg->func.name = "hid"; | |
634 | hidg->func.strings = ct_func_strings; | |
635 | hidg->func.bind = hidg_bind; | |
636 | hidg->func.unbind = hidg_unbind; | |
637 | hidg->func.set_alt = hidg_set_alt; | |
638 | hidg->func.disable = hidg_disable; | |
639 | hidg->func.setup = hidg_setup; | |
640 | ||
641 | status = usb_add_function(c, &hidg->func); | |
642 | if (status) | |
643 | kfree(hidg); | |
644 | ||
645 | return status; | |
646 | } | |
647 | ||
648 | int __init ghid_setup(struct usb_gadget *g, int count) | |
649 | { | |
650 | int status; | |
651 | dev_t dev; | |
652 | ||
653 | hidg_class = class_create(THIS_MODULE, "hidg"); | |
654 | ||
655 | status = alloc_chrdev_region(&dev, 0, count, "hidg"); | |
656 | if (!status) { | |
657 | major = MAJOR(dev); | |
658 | minors = count; | |
659 | } | |
660 | ||
661 | return status; | |
662 | } | |
663 | ||
664 | void ghid_cleanup(void) | |
665 | { | |
666 | if (major) { | |
667 | unregister_chrdev_region(MKDEV(major, 0), minors); | |
668 | major = minors = 0; | |
669 | } | |
670 | ||
671 | class_destroy(hidg_class); | |
672 | hidg_class = NULL; | |
673 | } |