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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> | |
71adf118 FC |
28 | #include <linux/uaccess.h> |
29 | #include <linux/wait.h> | |
30 | #include <linux/usb/g_hid.h> | |
31 | ||
32 | static int major, minors; | |
33 | static struct class *hidg_class; | |
34 | ||
35 | /*-------------------------------------------------------------------------*/ | |
36 | /* HID gadget struct */ | |
37 | ||
38 | struct f_hidg { | |
39 | /* configuration */ | |
40 | unsigned char bInterfaceSubClass; | |
41 | unsigned char bInterfaceProtocol; | |
42 | unsigned short report_desc_length; | |
43 | char *report_desc; | |
44 | unsigned short report_length; | |
45 | ||
46 | /* recv report */ | |
47 | char *set_report_buff; | |
48 | unsigned short set_report_length; | |
49 | spinlock_t spinlock; | |
50 | wait_queue_head_t read_queue; | |
51 | ||
52 | /* send report */ | |
53 | struct mutex lock; | |
54 | bool write_pending; | |
55 | wait_queue_head_t write_queue; | |
56 | struct usb_request *req; | |
57 | ||
58 | int minor; | |
59 | struct cdev cdev; | |
60 | struct usb_function func; | |
61 | struct usb_ep *in_ep; | |
62 | struct usb_endpoint_descriptor *fs_in_ep_desc; | |
63 | struct usb_endpoint_descriptor *hs_in_ep_desc; | |
64 | }; | |
65 | ||
66 | static inline struct f_hidg *func_to_hidg(struct usb_function *f) | |
67 | { | |
68 | return container_of(f, struct f_hidg, func); | |
69 | } | |
70 | ||
71 | /*-------------------------------------------------------------------------*/ | |
72 | /* Static descriptors */ | |
73 | ||
74 | static struct usb_interface_descriptor hidg_interface_desc = { | |
75 | .bLength = sizeof hidg_interface_desc, | |
76 | .bDescriptorType = USB_DT_INTERFACE, | |
77 | /* .bInterfaceNumber = DYNAMIC */ | |
78 | .bAlternateSetting = 0, | |
79 | .bNumEndpoints = 1, | |
80 | .bInterfaceClass = USB_CLASS_HID, | |
81 | /* .bInterfaceSubClass = DYNAMIC */ | |
82 | /* .bInterfaceProtocol = DYNAMIC */ | |
83 | /* .iInterface = DYNAMIC */ | |
84 | }; | |
85 | ||
86 | static struct hid_descriptor hidg_desc = { | |
87 | .bLength = sizeof hidg_desc, | |
88 | .bDescriptorType = HID_DT_HID, | |
89 | .bcdHID = 0x0101, | |
90 | .bCountryCode = 0x00, | |
91 | .bNumDescriptors = 0x1, | |
92 | /*.desc[0].bDescriptorType = DYNAMIC */ | |
93 | /*.desc[0].wDescriptorLenght = DYNAMIC */ | |
94 | }; | |
95 | ||
96 | /* High-Speed Support */ | |
97 | ||
98 | static struct usb_endpoint_descriptor hidg_hs_in_ep_desc = { | |
99 | .bLength = USB_DT_ENDPOINT_SIZE, | |
100 | .bDescriptorType = USB_DT_ENDPOINT, | |
101 | .bEndpointAddress = USB_DIR_IN, | |
102 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
103 | /*.wMaxPacketSize = DYNAMIC */ | |
104 | .bInterval = 4, /* FIXME: Add this field in the | |
105 | * HID gadget configuration? | |
106 | * (struct hidg_func_descriptor) | |
107 | */ | |
108 | }; | |
109 | ||
110 | static struct usb_descriptor_header *hidg_hs_descriptors[] = { | |
111 | (struct usb_descriptor_header *)&hidg_interface_desc, | |
112 | (struct usb_descriptor_header *)&hidg_desc, | |
113 | (struct usb_descriptor_header *)&hidg_hs_in_ep_desc, | |
114 | NULL, | |
115 | }; | |
116 | ||
117 | /* Full-Speed Support */ | |
118 | ||
119 | static struct usb_endpoint_descriptor hidg_fs_in_ep_desc = { | |
120 | .bLength = USB_DT_ENDPOINT_SIZE, | |
121 | .bDescriptorType = USB_DT_ENDPOINT, | |
122 | .bEndpointAddress = USB_DIR_IN, | |
123 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
124 | /*.wMaxPacketSize = DYNAMIC */ | |
125 | .bInterval = 10, /* FIXME: Add this field in the | |
126 | * HID gadget configuration? | |
127 | * (struct hidg_func_descriptor) | |
128 | */ | |
129 | }; | |
130 | ||
131 | static struct usb_descriptor_header *hidg_fs_descriptors[] = { | |
132 | (struct usb_descriptor_header *)&hidg_interface_desc, | |
133 | (struct usb_descriptor_header *)&hidg_desc, | |
134 | (struct usb_descriptor_header *)&hidg_fs_in_ep_desc, | |
135 | NULL, | |
136 | }; | |
137 | ||
138 | /*-------------------------------------------------------------------------*/ | |
139 | /* Char Device */ | |
140 | ||
141 | static ssize_t f_hidg_read(struct file *file, char __user *buffer, | |
142 | size_t count, loff_t *ptr) | |
143 | { | |
fd63b10b | 144 | struct f_hidg *hidg = file->private_data; |
71adf118 FC |
145 | char *tmp_buff = NULL; |
146 | unsigned long flags; | |
147 | ||
148 | if (!count) | |
149 | return 0; | |
150 | ||
151 | if (!access_ok(VERIFY_WRITE, buffer, count)) | |
152 | return -EFAULT; | |
153 | ||
154 | spin_lock_irqsave(&hidg->spinlock, flags); | |
155 | ||
156 | #define READ_COND (hidg->set_report_buff != NULL) | |
157 | ||
158 | while (!READ_COND) { | |
159 | spin_unlock_irqrestore(&hidg->spinlock, flags); | |
160 | if (file->f_flags & O_NONBLOCK) | |
161 | return -EAGAIN; | |
162 | ||
163 | if (wait_event_interruptible(hidg->read_queue, READ_COND)) | |
164 | return -ERESTARTSYS; | |
165 | ||
166 | spin_lock_irqsave(&hidg->spinlock, flags); | |
167 | } | |
168 | ||
169 | ||
170 | count = min_t(unsigned, count, hidg->set_report_length); | |
171 | tmp_buff = hidg->set_report_buff; | |
172 | hidg->set_report_buff = NULL; | |
173 | ||
174 | spin_unlock_irqrestore(&hidg->spinlock, flags); | |
175 | ||
176 | if (tmp_buff != NULL) { | |
177 | /* copy to user outside spinlock */ | |
178 | count -= copy_to_user(buffer, tmp_buff, count); | |
179 | kfree(tmp_buff); | |
180 | } else | |
181 | count = -ENOMEM; | |
182 | ||
183 | return count; | |
184 | } | |
185 | ||
186 | static void f_hidg_req_complete(struct usb_ep *ep, struct usb_request *req) | |
187 | { | |
188 | struct f_hidg *hidg = (struct f_hidg *)ep->driver_data; | |
189 | ||
190 | if (req->status != 0) { | |
191 | ERROR(hidg->func.config->cdev, | |
192 | "End Point Request ERROR: %d\n", req->status); | |
193 | } | |
194 | ||
195 | hidg->write_pending = 0; | |
196 | wake_up(&hidg->write_queue); | |
197 | } | |
198 | ||
199 | static ssize_t f_hidg_write(struct file *file, const char __user *buffer, | |
200 | size_t count, loff_t *offp) | |
201 | { | |
fd63b10b | 202 | struct f_hidg *hidg = file->private_data; |
71adf118 FC |
203 | ssize_t status = -ENOMEM; |
204 | ||
205 | if (!access_ok(VERIFY_READ, buffer, count)) | |
206 | return -EFAULT; | |
207 | ||
208 | mutex_lock(&hidg->lock); | |
209 | ||
210 | #define WRITE_COND (!hidg->write_pending) | |
211 | ||
212 | /* write queue */ | |
213 | while (!WRITE_COND) { | |
214 | mutex_unlock(&hidg->lock); | |
215 | if (file->f_flags & O_NONBLOCK) | |
216 | return -EAGAIN; | |
217 | ||
218 | if (wait_event_interruptible_exclusive( | |
219 | hidg->write_queue, WRITE_COND)) | |
220 | return -ERESTARTSYS; | |
221 | ||
222 | mutex_lock(&hidg->lock); | |
223 | } | |
224 | ||
225 | count = min_t(unsigned, count, hidg->report_length); | |
226 | status = copy_from_user(hidg->req->buf, buffer, count); | |
227 | ||
228 | if (status != 0) { | |
229 | ERROR(hidg->func.config->cdev, | |
230 | "copy_from_user error\n"); | |
231 | mutex_unlock(&hidg->lock); | |
232 | return -EINVAL; | |
233 | } | |
234 | ||
235 | hidg->req->status = 0; | |
236 | hidg->req->zero = 0; | |
237 | hidg->req->length = count; | |
238 | hidg->req->complete = f_hidg_req_complete; | |
239 | hidg->req->context = hidg; | |
240 | hidg->write_pending = 1; | |
241 | ||
242 | status = usb_ep_queue(hidg->in_ep, hidg->req, GFP_ATOMIC); | |
243 | if (status < 0) { | |
244 | ERROR(hidg->func.config->cdev, | |
245 | "usb_ep_queue error on int endpoint %zd\n", status); | |
246 | hidg->write_pending = 0; | |
247 | wake_up(&hidg->write_queue); | |
248 | } else { | |
249 | status = count; | |
250 | } | |
251 | ||
252 | mutex_unlock(&hidg->lock); | |
253 | ||
254 | return status; | |
255 | } | |
256 | ||
257 | static unsigned int f_hidg_poll(struct file *file, poll_table *wait) | |
258 | { | |
fd63b10b | 259 | struct f_hidg *hidg = file->private_data; |
71adf118 FC |
260 | unsigned int ret = 0; |
261 | ||
262 | poll_wait(file, &hidg->read_queue, wait); | |
263 | poll_wait(file, &hidg->write_queue, wait); | |
264 | ||
265 | if (WRITE_COND) | |
266 | ret |= POLLOUT | POLLWRNORM; | |
267 | ||
268 | if (READ_COND) | |
269 | ret |= POLLIN | POLLRDNORM; | |
270 | ||
271 | return ret; | |
272 | } | |
273 | ||
274 | #undef WRITE_COND | |
275 | #undef READ_COND | |
276 | ||
277 | static int f_hidg_release(struct inode *inode, struct file *fd) | |
278 | { | |
279 | fd->private_data = NULL; | |
280 | return 0; | |
281 | } | |
282 | ||
283 | static int f_hidg_open(struct inode *inode, struct file *fd) | |
284 | { | |
285 | struct f_hidg *hidg = | |
286 | container_of(inode->i_cdev, struct f_hidg, cdev); | |
287 | ||
288 | fd->private_data = hidg; | |
289 | ||
290 | return 0; | |
291 | } | |
292 | ||
293 | /*-------------------------------------------------------------------------*/ | |
294 | /* usb_function */ | |
295 | ||
296 | static void hidg_set_report_complete(struct usb_ep *ep, struct usb_request *req) | |
297 | { | |
298 | struct f_hidg *hidg = (struct f_hidg *)req->context; | |
299 | ||
300 | if (req->status != 0 || req->buf == NULL || req->actual == 0) { | |
301 | ERROR(hidg->func.config->cdev, "%s FAILED\n", __func__); | |
302 | return; | |
303 | } | |
304 | ||
305 | spin_lock(&hidg->spinlock); | |
306 | ||
307 | hidg->set_report_buff = krealloc(hidg->set_report_buff, | |
308 | req->actual, GFP_ATOMIC); | |
309 | ||
310 | if (hidg->set_report_buff == NULL) { | |
311 | spin_unlock(&hidg->spinlock); | |
312 | return; | |
313 | } | |
314 | hidg->set_report_length = req->actual; | |
315 | memcpy(hidg->set_report_buff, req->buf, req->actual); | |
316 | ||
317 | spin_unlock(&hidg->spinlock); | |
318 | ||
319 | wake_up(&hidg->read_queue); | |
71adf118 FC |
320 | } |
321 | ||
322 | static int hidg_setup(struct usb_function *f, | |
323 | const struct usb_ctrlrequest *ctrl) | |
324 | { | |
325 | struct f_hidg *hidg = func_to_hidg(f); | |
326 | struct usb_composite_dev *cdev = f->config->cdev; | |
327 | struct usb_request *req = cdev->req; | |
328 | int status = 0; | |
329 | __u16 value, length; | |
330 | ||
331 | value = __le16_to_cpu(ctrl->wValue); | |
332 | length = __le16_to_cpu(ctrl->wLength); | |
333 | ||
334 | VDBG(cdev, "hid_setup crtl_request : bRequestType:0x%x bRequest:0x%x " | |
335 | "Value:0x%x\n", ctrl->bRequestType, ctrl->bRequest, value); | |
336 | ||
337 | switch ((ctrl->bRequestType << 8) | ctrl->bRequest) { | |
338 | case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
339 | | HID_REQ_GET_REPORT): | |
340 | VDBG(cdev, "get_report\n"); | |
341 | ||
342 | /* send an empty report */ | |
343 | length = min_t(unsigned, length, hidg->report_length); | |
344 | memset(req->buf, 0x0, length); | |
345 | ||
346 | goto respond; | |
347 | break; | |
348 | ||
349 | case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
350 | | HID_REQ_GET_PROTOCOL): | |
351 | VDBG(cdev, "get_protocol\n"); | |
352 | goto stall; | |
353 | break; | |
354 | ||
355 | case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
356 | | HID_REQ_SET_REPORT): | |
357 | VDBG(cdev, "set_report | wLenght=%d\n", ctrl->wLength); | |
358 | req->context = hidg; | |
359 | req->complete = hidg_set_report_complete; | |
360 | goto respond; | |
361 | break; | |
362 | ||
363 | case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
364 | | HID_REQ_SET_PROTOCOL): | |
365 | VDBG(cdev, "set_protocol\n"); | |
366 | goto stall; | |
367 | break; | |
368 | ||
369 | case ((USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_INTERFACE) << 8 | |
370 | | USB_REQ_GET_DESCRIPTOR): | |
371 | switch (value >> 8) { | |
372 | case HID_DT_REPORT: | |
373 | VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: REPORT\n"); | |
374 | length = min_t(unsigned short, length, | |
375 | hidg->report_desc_length); | |
376 | memcpy(req->buf, hidg->report_desc, length); | |
377 | goto respond; | |
378 | break; | |
379 | ||
380 | default: | |
381 | VDBG(cdev, "Unknown decriptor request 0x%x\n", | |
382 | value >> 8); | |
383 | goto stall; | |
384 | break; | |
385 | } | |
386 | break; | |
387 | ||
388 | default: | |
389 | VDBG(cdev, "Unknown request 0x%x\n", | |
390 | ctrl->bRequest); | |
391 | goto stall; | |
392 | break; | |
393 | } | |
394 | ||
395 | stall: | |
396 | return -EOPNOTSUPP; | |
397 | ||
398 | respond: | |
399 | req->zero = 0; | |
400 | req->length = length; | |
401 | status = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); | |
402 | if (status < 0) | |
403 | ERROR(cdev, "usb_ep_queue error on ep0 %d\n", value); | |
404 | return status; | |
405 | } | |
406 | ||
407 | static void hidg_disable(struct usb_function *f) | |
408 | { | |
409 | struct f_hidg *hidg = func_to_hidg(f); | |
410 | ||
411 | usb_ep_disable(hidg->in_ep); | |
412 | hidg->in_ep->driver_data = NULL; | |
71adf118 FC |
413 | } |
414 | ||
415 | static int hidg_set_alt(struct usb_function *f, unsigned intf, unsigned alt) | |
416 | { | |
417 | struct usb_composite_dev *cdev = f->config->cdev; | |
418 | struct f_hidg *hidg = func_to_hidg(f); | |
419 | const struct usb_endpoint_descriptor *ep_desc; | |
420 | int status = 0; | |
421 | ||
422 | VDBG(cdev, "hidg_set_alt intf:%d alt:%d\n", intf, alt); | |
423 | ||
424 | if (hidg->in_ep != NULL) { | |
425 | /* restart endpoint */ | |
426 | if (hidg->in_ep->driver_data != NULL) | |
427 | usb_ep_disable(hidg->in_ep); | |
428 | ||
429 | ep_desc = ep_choose(f->config->cdev->gadget, | |
430 | hidg->hs_in_ep_desc, hidg->fs_in_ep_desc); | |
431 | status = usb_ep_enable(hidg->in_ep, ep_desc); | |
432 | if (status < 0) { | |
433 | ERROR(cdev, "Enable endpoint FAILED!\n"); | |
434 | goto fail; | |
435 | } | |
436 | hidg->in_ep->driver_data = hidg; | |
437 | } | |
438 | fail: | |
439 | return status; | |
440 | } | |
441 | ||
442 | const struct file_operations f_hidg_fops = { | |
443 | .owner = THIS_MODULE, | |
444 | .open = f_hidg_open, | |
445 | .release = f_hidg_release, | |
446 | .write = f_hidg_write, | |
447 | .read = f_hidg_read, | |
448 | .poll = f_hidg_poll, | |
6038f373 | 449 | .llseek = noop_llseek, |
71adf118 FC |
450 | }; |
451 | ||
452 | static int __init hidg_bind(struct usb_configuration *c, struct usb_function *f) | |
453 | { | |
454 | struct usb_ep *ep; | |
455 | struct f_hidg *hidg = func_to_hidg(f); | |
456 | int status; | |
457 | dev_t dev; | |
458 | ||
459 | /* allocate instance-specific interface IDs, and patch descriptors */ | |
460 | status = usb_interface_id(c, f); | |
461 | if (status < 0) | |
462 | goto fail; | |
463 | hidg_interface_desc.bInterfaceNumber = status; | |
464 | ||
465 | ||
466 | /* allocate instance-specific endpoints */ | |
467 | status = -ENODEV; | |
468 | ep = usb_ep_autoconfig(c->cdev->gadget, &hidg_fs_in_ep_desc); | |
469 | if (!ep) | |
470 | goto fail; | |
471 | ep->driver_data = c->cdev; /* claim */ | |
472 | hidg->in_ep = ep; | |
473 | ||
474 | /* preallocate request and buffer */ | |
475 | status = -ENOMEM; | |
476 | hidg->req = usb_ep_alloc_request(hidg->in_ep, GFP_KERNEL); | |
477 | if (!hidg->req) | |
478 | goto fail; | |
479 | ||
480 | ||
481 | hidg->req->buf = kmalloc(hidg->report_length, GFP_KERNEL); | |
482 | if (!hidg->req->buf) | |
483 | goto fail; | |
484 | ||
485 | /* set descriptor dynamic values */ | |
486 | hidg_interface_desc.bInterfaceSubClass = hidg->bInterfaceSubClass; | |
487 | hidg_interface_desc.bInterfaceProtocol = hidg->bInterfaceProtocol; | |
488 | hidg_hs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); | |
489 | hidg_fs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); | |
490 | hidg_desc.desc[0].bDescriptorType = HID_DT_REPORT; | |
491 | hidg_desc.desc[0].wDescriptorLength = | |
492 | cpu_to_le16(hidg->report_desc_length); | |
493 | ||
494 | hidg->set_report_buff = NULL; | |
495 | ||
496 | /* copy descriptors */ | |
497 | f->descriptors = usb_copy_descriptors(hidg_fs_descriptors); | |
498 | if (!f->descriptors) | |
499 | goto fail; | |
500 | ||
501 | hidg->fs_in_ep_desc = usb_find_endpoint(hidg_fs_descriptors, | |
502 | f->descriptors, | |
503 | &hidg_fs_in_ep_desc); | |
504 | ||
505 | if (gadget_is_dualspeed(c->cdev->gadget)) { | |
506 | hidg_hs_in_ep_desc.bEndpointAddress = | |
507 | hidg_fs_in_ep_desc.bEndpointAddress; | |
508 | f->hs_descriptors = usb_copy_descriptors(hidg_hs_descriptors); | |
509 | if (!f->hs_descriptors) | |
510 | goto fail; | |
511 | hidg->hs_in_ep_desc = usb_find_endpoint(hidg_hs_descriptors, | |
512 | f->hs_descriptors, | |
513 | &hidg_hs_in_ep_desc); | |
514 | } else { | |
515 | hidg->hs_in_ep_desc = NULL; | |
516 | } | |
517 | ||
518 | mutex_init(&hidg->lock); | |
519 | spin_lock_init(&hidg->spinlock); | |
520 | init_waitqueue_head(&hidg->write_queue); | |
521 | init_waitqueue_head(&hidg->read_queue); | |
522 | ||
523 | /* create char device */ | |
524 | cdev_init(&hidg->cdev, &f_hidg_fops); | |
525 | dev = MKDEV(major, hidg->minor); | |
526 | status = cdev_add(&hidg->cdev, dev, 1); | |
527 | if (status) | |
528 | goto fail; | |
529 | ||
530 | device_create(hidg_class, NULL, dev, NULL, "%s%d", "hidg", hidg->minor); | |
531 | ||
532 | return 0; | |
533 | ||
534 | fail: | |
535 | ERROR(f->config->cdev, "hidg_bind FAILED\n"); | |
536 | if (hidg->req != NULL) { | |
537 | kfree(hidg->req->buf); | |
538 | if (hidg->in_ep != NULL) | |
539 | usb_ep_free_request(hidg->in_ep, hidg->req); | |
540 | } | |
541 | ||
542 | usb_free_descriptors(f->hs_descriptors); | |
543 | usb_free_descriptors(f->descriptors); | |
544 | ||
545 | return status; | |
546 | } | |
547 | ||
548 | static void hidg_unbind(struct usb_configuration *c, struct usb_function *f) | |
549 | { | |
550 | struct f_hidg *hidg = func_to_hidg(f); | |
551 | ||
552 | device_destroy(hidg_class, MKDEV(major, hidg->minor)); | |
553 | cdev_del(&hidg->cdev); | |
554 | ||
555 | /* disable/free request and end point */ | |
556 | usb_ep_disable(hidg->in_ep); | |
557 | usb_ep_dequeue(hidg->in_ep, hidg->req); | |
558 | kfree(hidg->req->buf); | |
559 | usb_ep_free_request(hidg->in_ep, hidg->req); | |
560 | ||
561 | /* free descriptors copies */ | |
562 | usb_free_descriptors(f->hs_descriptors); | |
563 | usb_free_descriptors(f->descriptors); | |
564 | ||
565 | kfree(hidg->report_desc); | |
566 | kfree(hidg->set_report_buff); | |
567 | kfree(hidg); | |
568 | } | |
569 | ||
570 | /*-------------------------------------------------------------------------*/ | |
571 | /* Strings */ | |
572 | ||
573 | #define CT_FUNC_HID_IDX 0 | |
574 | ||
575 | static struct usb_string ct_func_string_defs[] = { | |
576 | [CT_FUNC_HID_IDX].s = "HID Interface", | |
577 | {}, /* end of list */ | |
578 | }; | |
579 | ||
580 | static struct usb_gadget_strings ct_func_string_table = { | |
581 | .language = 0x0409, /* en-US */ | |
582 | .strings = ct_func_string_defs, | |
583 | }; | |
584 | ||
585 | static struct usb_gadget_strings *ct_func_strings[] = { | |
586 | &ct_func_string_table, | |
587 | NULL, | |
588 | }; | |
589 | ||
590 | /*-------------------------------------------------------------------------*/ | |
591 | /* usb_configuration */ | |
592 | ||
593 | int __init hidg_bind_config(struct usb_configuration *c, | |
594 | struct hidg_func_descriptor *fdesc, int index) | |
595 | { | |
596 | struct f_hidg *hidg; | |
597 | int status; | |
598 | ||
599 | if (index >= minors) | |
600 | return -ENOENT; | |
601 | ||
602 | /* maybe allocate device-global string IDs, and patch descriptors */ | |
603 | if (ct_func_string_defs[CT_FUNC_HID_IDX].id == 0) { | |
604 | status = usb_string_id(c->cdev); | |
605 | if (status < 0) | |
606 | return status; | |
607 | ct_func_string_defs[CT_FUNC_HID_IDX].id = status; | |
608 | hidg_interface_desc.iInterface = status; | |
609 | } | |
610 | ||
611 | /* allocate and initialize one new instance */ | |
612 | hidg = kzalloc(sizeof *hidg, GFP_KERNEL); | |
613 | if (!hidg) | |
614 | return -ENOMEM; | |
615 | ||
616 | hidg->minor = index; | |
617 | hidg->bInterfaceSubClass = fdesc->subclass; | |
618 | hidg->bInterfaceProtocol = fdesc->protocol; | |
619 | hidg->report_length = fdesc->report_length; | |
620 | hidg->report_desc_length = fdesc->report_desc_length; | |
621 | hidg->report_desc = kmemdup(fdesc->report_desc, | |
622 | fdesc->report_desc_length, | |
623 | GFP_KERNEL); | |
624 | if (!hidg->report_desc) { | |
625 | kfree(hidg); | |
626 | return -ENOMEM; | |
627 | } | |
628 | ||
629 | hidg->func.name = "hid"; | |
630 | hidg->func.strings = ct_func_strings; | |
631 | hidg->func.bind = hidg_bind; | |
632 | hidg->func.unbind = hidg_unbind; | |
633 | hidg->func.set_alt = hidg_set_alt; | |
634 | hidg->func.disable = hidg_disable; | |
635 | hidg->func.setup = hidg_setup; | |
636 | ||
637 | status = usb_add_function(c, &hidg->func); | |
638 | if (status) | |
639 | kfree(hidg); | |
640 | ||
641 | return status; | |
642 | } | |
643 | ||
644 | int __init ghid_setup(struct usb_gadget *g, int count) | |
645 | { | |
646 | int status; | |
647 | dev_t dev; | |
648 | ||
649 | hidg_class = class_create(THIS_MODULE, "hidg"); | |
650 | ||
651 | status = alloc_chrdev_region(&dev, 0, count, "hidg"); | |
652 | if (!status) { | |
653 | major = MAJOR(dev); | |
654 | minors = count; | |
655 | } | |
656 | ||
657 | return status; | |
658 | } | |
659 | ||
660 | void ghid_cleanup(void) | |
661 | { | |
662 | if (major) { | |
663 | unregister_chrdev_region(MKDEV(major, 0), minors); | |
664 | major = minors = 0; | |
665 | } | |
666 | ||
667 | class_destroy(hidg_class); | |
668 | hidg_class = NULL; | |
669 | } |