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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; | |
71adf118 FC |
62 | }; |
63 | ||
64 | static inline struct f_hidg *func_to_hidg(struct usb_function *f) | |
65 | { | |
66 | return container_of(f, struct f_hidg, func); | |
67 | } | |
68 | ||
69 | /*-------------------------------------------------------------------------*/ | |
70 | /* Static descriptors */ | |
71 | ||
72 | static struct usb_interface_descriptor hidg_interface_desc = { | |
73 | .bLength = sizeof hidg_interface_desc, | |
74 | .bDescriptorType = USB_DT_INTERFACE, | |
75 | /* .bInterfaceNumber = DYNAMIC */ | |
76 | .bAlternateSetting = 0, | |
77 | .bNumEndpoints = 1, | |
78 | .bInterfaceClass = USB_CLASS_HID, | |
79 | /* .bInterfaceSubClass = DYNAMIC */ | |
80 | /* .bInterfaceProtocol = DYNAMIC */ | |
81 | /* .iInterface = DYNAMIC */ | |
82 | }; | |
83 | ||
84 | static struct hid_descriptor hidg_desc = { | |
85 | .bLength = sizeof hidg_desc, | |
86 | .bDescriptorType = HID_DT_HID, | |
87 | .bcdHID = 0x0101, | |
88 | .bCountryCode = 0x00, | |
89 | .bNumDescriptors = 0x1, | |
90 | /*.desc[0].bDescriptorType = DYNAMIC */ | |
91 | /*.desc[0].wDescriptorLenght = DYNAMIC */ | |
92 | }; | |
93 | ||
94 | /* High-Speed Support */ | |
95 | ||
96 | static struct usb_endpoint_descriptor hidg_hs_in_ep_desc = { | |
97 | .bLength = USB_DT_ENDPOINT_SIZE, | |
98 | .bDescriptorType = USB_DT_ENDPOINT, | |
99 | .bEndpointAddress = USB_DIR_IN, | |
100 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
101 | /*.wMaxPacketSize = DYNAMIC */ | |
102 | .bInterval = 4, /* FIXME: Add this field in the | |
103 | * HID gadget configuration? | |
104 | * (struct hidg_func_descriptor) | |
105 | */ | |
106 | }; | |
107 | ||
108 | static struct usb_descriptor_header *hidg_hs_descriptors[] = { | |
109 | (struct usb_descriptor_header *)&hidg_interface_desc, | |
110 | (struct usb_descriptor_header *)&hidg_desc, | |
111 | (struct usb_descriptor_header *)&hidg_hs_in_ep_desc, | |
112 | NULL, | |
113 | }; | |
114 | ||
115 | /* Full-Speed Support */ | |
116 | ||
117 | static struct usb_endpoint_descriptor hidg_fs_in_ep_desc = { | |
118 | .bLength = USB_DT_ENDPOINT_SIZE, | |
119 | .bDescriptorType = USB_DT_ENDPOINT, | |
120 | .bEndpointAddress = USB_DIR_IN, | |
121 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
122 | /*.wMaxPacketSize = DYNAMIC */ | |
123 | .bInterval = 10, /* FIXME: Add this field in the | |
124 | * HID gadget configuration? | |
125 | * (struct hidg_func_descriptor) | |
126 | */ | |
127 | }; | |
128 | ||
129 | static struct usb_descriptor_header *hidg_fs_descriptors[] = { | |
130 | (struct usb_descriptor_header *)&hidg_interface_desc, | |
131 | (struct usb_descriptor_header *)&hidg_desc, | |
132 | (struct usb_descriptor_header *)&hidg_fs_in_ep_desc, | |
133 | NULL, | |
134 | }; | |
135 | ||
136 | /*-------------------------------------------------------------------------*/ | |
137 | /* Char Device */ | |
138 | ||
139 | static ssize_t f_hidg_read(struct file *file, char __user *buffer, | |
140 | size_t count, loff_t *ptr) | |
141 | { | |
fd63b10b | 142 | struct f_hidg *hidg = file->private_data; |
71adf118 FC |
143 | char *tmp_buff = NULL; |
144 | unsigned long flags; | |
145 | ||
146 | if (!count) | |
147 | return 0; | |
148 | ||
149 | if (!access_ok(VERIFY_WRITE, buffer, count)) | |
150 | return -EFAULT; | |
151 | ||
152 | spin_lock_irqsave(&hidg->spinlock, flags); | |
153 | ||
154 | #define READ_COND (hidg->set_report_buff != NULL) | |
155 | ||
156 | while (!READ_COND) { | |
157 | spin_unlock_irqrestore(&hidg->spinlock, flags); | |
158 | if (file->f_flags & O_NONBLOCK) | |
159 | return -EAGAIN; | |
160 | ||
161 | if (wait_event_interruptible(hidg->read_queue, READ_COND)) | |
162 | return -ERESTARTSYS; | |
163 | ||
164 | spin_lock_irqsave(&hidg->spinlock, flags); | |
165 | } | |
166 | ||
167 | ||
168 | count = min_t(unsigned, count, hidg->set_report_length); | |
169 | tmp_buff = hidg->set_report_buff; | |
170 | hidg->set_report_buff = NULL; | |
171 | ||
172 | spin_unlock_irqrestore(&hidg->spinlock, flags); | |
173 | ||
174 | if (tmp_buff != NULL) { | |
175 | /* copy to user outside spinlock */ | |
176 | count -= copy_to_user(buffer, tmp_buff, count); | |
177 | kfree(tmp_buff); | |
178 | } else | |
179 | count = -ENOMEM; | |
180 | ||
181 | return count; | |
182 | } | |
183 | ||
184 | static void f_hidg_req_complete(struct usb_ep *ep, struct usb_request *req) | |
185 | { | |
186 | struct f_hidg *hidg = (struct f_hidg *)ep->driver_data; | |
187 | ||
188 | if (req->status != 0) { | |
189 | ERROR(hidg->func.config->cdev, | |
190 | "End Point Request ERROR: %d\n", req->status); | |
191 | } | |
192 | ||
193 | hidg->write_pending = 0; | |
194 | wake_up(&hidg->write_queue); | |
195 | } | |
196 | ||
197 | static ssize_t f_hidg_write(struct file *file, const char __user *buffer, | |
198 | size_t count, loff_t *offp) | |
199 | { | |
fd63b10b | 200 | struct f_hidg *hidg = file->private_data; |
71adf118 FC |
201 | ssize_t status = -ENOMEM; |
202 | ||
203 | if (!access_ok(VERIFY_READ, buffer, count)) | |
204 | return -EFAULT; | |
205 | ||
206 | mutex_lock(&hidg->lock); | |
207 | ||
208 | #define WRITE_COND (!hidg->write_pending) | |
209 | ||
210 | /* write queue */ | |
211 | while (!WRITE_COND) { | |
212 | mutex_unlock(&hidg->lock); | |
213 | if (file->f_flags & O_NONBLOCK) | |
214 | return -EAGAIN; | |
215 | ||
216 | if (wait_event_interruptible_exclusive( | |
217 | hidg->write_queue, WRITE_COND)) | |
218 | return -ERESTARTSYS; | |
219 | ||
220 | mutex_lock(&hidg->lock); | |
221 | } | |
222 | ||
223 | count = min_t(unsigned, count, hidg->report_length); | |
224 | status = copy_from_user(hidg->req->buf, buffer, count); | |
225 | ||
226 | if (status != 0) { | |
227 | ERROR(hidg->func.config->cdev, | |
228 | "copy_from_user error\n"); | |
229 | mutex_unlock(&hidg->lock); | |
230 | return -EINVAL; | |
231 | } | |
232 | ||
233 | hidg->req->status = 0; | |
234 | hidg->req->zero = 0; | |
235 | hidg->req->length = count; | |
236 | hidg->req->complete = f_hidg_req_complete; | |
237 | hidg->req->context = hidg; | |
238 | hidg->write_pending = 1; | |
239 | ||
240 | status = usb_ep_queue(hidg->in_ep, hidg->req, GFP_ATOMIC); | |
241 | if (status < 0) { | |
242 | ERROR(hidg->func.config->cdev, | |
243 | "usb_ep_queue error on int endpoint %zd\n", status); | |
244 | hidg->write_pending = 0; | |
245 | wake_up(&hidg->write_queue); | |
246 | } else { | |
247 | status = count; | |
248 | } | |
249 | ||
250 | mutex_unlock(&hidg->lock); | |
251 | ||
252 | return status; | |
253 | } | |
254 | ||
255 | static unsigned int f_hidg_poll(struct file *file, poll_table *wait) | |
256 | { | |
fd63b10b | 257 | struct f_hidg *hidg = file->private_data; |
71adf118 FC |
258 | unsigned int ret = 0; |
259 | ||
260 | poll_wait(file, &hidg->read_queue, wait); | |
261 | poll_wait(file, &hidg->write_queue, wait); | |
262 | ||
263 | if (WRITE_COND) | |
264 | ret |= POLLOUT | POLLWRNORM; | |
265 | ||
266 | if (READ_COND) | |
267 | ret |= POLLIN | POLLRDNORM; | |
268 | ||
269 | return ret; | |
270 | } | |
271 | ||
272 | #undef WRITE_COND | |
273 | #undef READ_COND | |
274 | ||
275 | static int f_hidg_release(struct inode *inode, struct file *fd) | |
276 | { | |
277 | fd->private_data = NULL; | |
278 | return 0; | |
279 | } | |
280 | ||
281 | static int f_hidg_open(struct inode *inode, struct file *fd) | |
282 | { | |
283 | struct f_hidg *hidg = | |
284 | container_of(inode->i_cdev, struct f_hidg, cdev); | |
285 | ||
286 | fd->private_data = hidg; | |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
291 | /*-------------------------------------------------------------------------*/ | |
292 | /* usb_function */ | |
293 | ||
294 | static void hidg_set_report_complete(struct usb_ep *ep, struct usb_request *req) | |
295 | { | |
296 | struct f_hidg *hidg = (struct f_hidg *)req->context; | |
297 | ||
298 | if (req->status != 0 || req->buf == NULL || req->actual == 0) { | |
299 | ERROR(hidg->func.config->cdev, "%s FAILED\n", __func__); | |
300 | return; | |
301 | } | |
302 | ||
303 | spin_lock(&hidg->spinlock); | |
304 | ||
305 | hidg->set_report_buff = krealloc(hidg->set_report_buff, | |
306 | req->actual, GFP_ATOMIC); | |
307 | ||
308 | if (hidg->set_report_buff == NULL) { | |
309 | spin_unlock(&hidg->spinlock); | |
310 | return; | |
311 | } | |
312 | hidg->set_report_length = req->actual; | |
313 | memcpy(hidg->set_report_buff, req->buf, req->actual); | |
314 | ||
315 | spin_unlock(&hidg->spinlock); | |
316 | ||
317 | wake_up(&hidg->read_queue); | |
71adf118 FC |
318 | } |
319 | ||
320 | static int hidg_setup(struct usb_function *f, | |
321 | const struct usb_ctrlrequest *ctrl) | |
322 | { | |
323 | struct f_hidg *hidg = func_to_hidg(f); | |
324 | struct usb_composite_dev *cdev = f->config->cdev; | |
325 | struct usb_request *req = cdev->req; | |
326 | int status = 0; | |
327 | __u16 value, length; | |
328 | ||
329 | value = __le16_to_cpu(ctrl->wValue); | |
330 | length = __le16_to_cpu(ctrl->wLength); | |
331 | ||
332 | VDBG(cdev, "hid_setup crtl_request : bRequestType:0x%x bRequest:0x%x " | |
333 | "Value:0x%x\n", ctrl->bRequestType, ctrl->bRequest, value); | |
334 | ||
335 | switch ((ctrl->bRequestType << 8) | ctrl->bRequest) { | |
336 | case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
337 | | HID_REQ_GET_REPORT): | |
338 | VDBG(cdev, "get_report\n"); | |
339 | ||
340 | /* send an empty report */ | |
341 | length = min_t(unsigned, length, hidg->report_length); | |
342 | memset(req->buf, 0x0, length); | |
343 | ||
344 | goto respond; | |
345 | break; | |
346 | ||
347 | case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
348 | | HID_REQ_GET_PROTOCOL): | |
349 | VDBG(cdev, "get_protocol\n"); | |
350 | goto stall; | |
351 | break; | |
352 | ||
353 | case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
354 | | HID_REQ_SET_REPORT): | |
355 | VDBG(cdev, "set_report | wLenght=%d\n", ctrl->wLength); | |
356 | req->context = hidg; | |
357 | req->complete = hidg_set_report_complete; | |
358 | goto respond; | |
359 | break; | |
360 | ||
361 | case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
362 | | HID_REQ_SET_PROTOCOL): | |
363 | VDBG(cdev, "set_protocol\n"); | |
364 | goto stall; | |
365 | break; | |
366 | ||
367 | case ((USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_INTERFACE) << 8 | |
368 | | USB_REQ_GET_DESCRIPTOR): | |
369 | switch (value >> 8) { | |
370 | case HID_DT_REPORT: | |
371 | VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: REPORT\n"); | |
372 | length = min_t(unsigned short, length, | |
373 | hidg->report_desc_length); | |
374 | memcpy(req->buf, hidg->report_desc, length); | |
375 | goto respond; | |
376 | break; | |
377 | ||
378 | default: | |
379 | VDBG(cdev, "Unknown decriptor request 0x%x\n", | |
380 | value >> 8); | |
381 | goto stall; | |
382 | break; | |
383 | } | |
384 | break; | |
385 | ||
386 | default: | |
387 | VDBG(cdev, "Unknown request 0x%x\n", | |
388 | ctrl->bRequest); | |
389 | goto stall; | |
390 | break; | |
391 | } | |
392 | ||
393 | stall: | |
394 | return -EOPNOTSUPP; | |
395 | ||
396 | respond: | |
397 | req->zero = 0; | |
398 | req->length = length; | |
399 | status = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); | |
400 | if (status < 0) | |
401 | ERROR(cdev, "usb_ep_queue error on ep0 %d\n", value); | |
402 | return status; | |
403 | } | |
404 | ||
405 | static void hidg_disable(struct usb_function *f) | |
406 | { | |
407 | struct f_hidg *hidg = func_to_hidg(f); | |
408 | ||
409 | usb_ep_disable(hidg->in_ep); | |
410 | hidg->in_ep->driver_data = NULL; | |
71adf118 FC |
411 | } |
412 | ||
413 | static int hidg_set_alt(struct usb_function *f, unsigned intf, unsigned alt) | |
414 | { | |
415 | struct usb_composite_dev *cdev = f->config->cdev; | |
416 | struct f_hidg *hidg = func_to_hidg(f); | |
71adf118 FC |
417 | int status = 0; |
418 | ||
419 | VDBG(cdev, "hidg_set_alt intf:%d alt:%d\n", intf, alt); | |
420 | ||
421 | if (hidg->in_ep != NULL) { | |
422 | /* restart endpoint */ | |
423 | if (hidg->in_ep->driver_data != NULL) | |
424 | usb_ep_disable(hidg->in_ep); | |
425 | ||
ea2a1df7 TB |
426 | status = config_ep_by_speed(f->config->cdev->gadget, f, |
427 | hidg->in_ep); | |
428 | if (status) { | |
429 | ERROR(cdev, "config_ep_by_speed FAILED!\n"); | |
430 | goto fail; | |
431 | } | |
72c973dd | 432 | status = usb_ep_enable(hidg->in_ep); |
71adf118 FC |
433 | if (status < 0) { |
434 | ERROR(cdev, "Enable endpoint FAILED!\n"); | |
435 | goto fail; | |
436 | } | |
437 | hidg->in_ep->driver_data = hidg; | |
438 | } | |
439 | fail: | |
440 | return status; | |
441 | } | |
442 | ||
443 | const struct file_operations f_hidg_fops = { | |
444 | .owner = THIS_MODULE, | |
445 | .open = f_hidg_open, | |
446 | .release = f_hidg_release, | |
447 | .write = f_hidg_write, | |
448 | .read = f_hidg_read, | |
449 | .poll = f_hidg_poll, | |
6038f373 | 450 | .llseek = noop_llseek, |
71adf118 FC |
451 | }; |
452 | ||
453 | static int __init hidg_bind(struct usb_configuration *c, struct usb_function *f) | |
454 | { | |
455 | struct usb_ep *ep; | |
456 | struct f_hidg *hidg = func_to_hidg(f); | |
457 | int status; | |
458 | dev_t dev; | |
459 | ||
460 | /* allocate instance-specific interface IDs, and patch descriptors */ | |
461 | status = usb_interface_id(c, f); | |
462 | if (status < 0) | |
463 | goto fail; | |
464 | hidg_interface_desc.bInterfaceNumber = status; | |
465 | ||
466 | ||
467 | /* allocate instance-specific endpoints */ | |
468 | status = -ENODEV; | |
469 | ep = usb_ep_autoconfig(c->cdev->gadget, &hidg_fs_in_ep_desc); | |
470 | if (!ep) | |
471 | goto fail; | |
472 | ep->driver_data = c->cdev; /* claim */ | |
473 | hidg->in_ep = ep; | |
474 | ||
475 | /* preallocate request and buffer */ | |
476 | status = -ENOMEM; | |
477 | hidg->req = usb_ep_alloc_request(hidg->in_ep, GFP_KERNEL); | |
478 | if (!hidg->req) | |
479 | goto fail; | |
480 | ||
481 | ||
482 | hidg->req->buf = kmalloc(hidg->report_length, GFP_KERNEL); | |
483 | if (!hidg->req->buf) | |
484 | goto fail; | |
485 | ||
486 | /* set descriptor dynamic values */ | |
487 | hidg_interface_desc.bInterfaceSubClass = hidg->bInterfaceSubClass; | |
488 | hidg_interface_desc.bInterfaceProtocol = hidg->bInterfaceProtocol; | |
489 | hidg_hs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); | |
490 | hidg_fs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); | |
491 | hidg_desc.desc[0].bDescriptorType = HID_DT_REPORT; | |
492 | hidg_desc.desc[0].wDescriptorLength = | |
493 | cpu_to_le16(hidg->report_desc_length); | |
494 | ||
495 | hidg->set_report_buff = NULL; | |
496 | ||
497 | /* copy descriptors */ | |
498 | f->descriptors = usb_copy_descriptors(hidg_fs_descriptors); | |
499 | if (!f->descriptors) | |
500 | goto fail; | |
501 | ||
71adf118 FC |
502 | if (gadget_is_dualspeed(c->cdev->gadget)) { |
503 | hidg_hs_in_ep_desc.bEndpointAddress = | |
504 | hidg_fs_in_ep_desc.bEndpointAddress; | |
505 | f->hs_descriptors = usb_copy_descriptors(hidg_hs_descriptors); | |
506 | if (!f->hs_descriptors) | |
507 | goto fail; | |
71adf118 FC |
508 | } |
509 | ||
510 | mutex_init(&hidg->lock); | |
511 | spin_lock_init(&hidg->spinlock); | |
512 | init_waitqueue_head(&hidg->write_queue); | |
513 | init_waitqueue_head(&hidg->read_queue); | |
514 | ||
515 | /* create char device */ | |
516 | cdev_init(&hidg->cdev, &f_hidg_fops); | |
517 | dev = MKDEV(major, hidg->minor); | |
518 | status = cdev_add(&hidg->cdev, dev, 1); | |
519 | if (status) | |
520 | goto fail; | |
521 | ||
522 | device_create(hidg_class, NULL, dev, NULL, "%s%d", "hidg", hidg->minor); | |
523 | ||
524 | return 0; | |
525 | ||
526 | fail: | |
527 | ERROR(f->config->cdev, "hidg_bind FAILED\n"); | |
528 | if (hidg->req != NULL) { | |
529 | kfree(hidg->req->buf); | |
530 | if (hidg->in_ep != NULL) | |
531 | usb_ep_free_request(hidg->in_ep, hidg->req); | |
532 | } | |
533 | ||
534 | usb_free_descriptors(f->hs_descriptors); | |
535 | usb_free_descriptors(f->descriptors); | |
536 | ||
537 | return status; | |
538 | } | |
539 | ||
540 | static void hidg_unbind(struct usb_configuration *c, struct usb_function *f) | |
541 | { | |
542 | struct f_hidg *hidg = func_to_hidg(f); | |
543 | ||
544 | device_destroy(hidg_class, MKDEV(major, hidg->minor)); | |
545 | cdev_del(&hidg->cdev); | |
546 | ||
547 | /* disable/free request and end point */ | |
548 | usb_ep_disable(hidg->in_ep); | |
549 | usb_ep_dequeue(hidg->in_ep, hidg->req); | |
550 | kfree(hidg->req->buf); | |
551 | usb_ep_free_request(hidg->in_ep, hidg->req); | |
552 | ||
553 | /* free descriptors copies */ | |
554 | usb_free_descriptors(f->hs_descriptors); | |
555 | usb_free_descriptors(f->descriptors); | |
556 | ||
557 | kfree(hidg->report_desc); | |
558 | kfree(hidg->set_report_buff); | |
559 | kfree(hidg); | |
560 | } | |
561 | ||
562 | /*-------------------------------------------------------------------------*/ | |
563 | /* Strings */ | |
564 | ||
565 | #define CT_FUNC_HID_IDX 0 | |
566 | ||
567 | static struct usb_string ct_func_string_defs[] = { | |
568 | [CT_FUNC_HID_IDX].s = "HID Interface", | |
569 | {}, /* end of list */ | |
570 | }; | |
571 | ||
572 | static struct usb_gadget_strings ct_func_string_table = { | |
573 | .language = 0x0409, /* en-US */ | |
574 | .strings = ct_func_string_defs, | |
575 | }; | |
576 | ||
577 | static struct usb_gadget_strings *ct_func_strings[] = { | |
578 | &ct_func_string_table, | |
579 | NULL, | |
580 | }; | |
581 | ||
582 | /*-------------------------------------------------------------------------*/ | |
583 | /* usb_configuration */ | |
584 | ||
585 | int __init hidg_bind_config(struct usb_configuration *c, | |
586 | struct hidg_func_descriptor *fdesc, int index) | |
587 | { | |
588 | struct f_hidg *hidg; | |
589 | int status; | |
590 | ||
591 | if (index >= minors) | |
592 | return -ENOENT; | |
593 | ||
594 | /* maybe allocate device-global string IDs, and patch descriptors */ | |
595 | if (ct_func_string_defs[CT_FUNC_HID_IDX].id == 0) { | |
596 | status = usb_string_id(c->cdev); | |
597 | if (status < 0) | |
598 | return status; | |
599 | ct_func_string_defs[CT_FUNC_HID_IDX].id = status; | |
600 | hidg_interface_desc.iInterface = status; | |
601 | } | |
602 | ||
603 | /* allocate and initialize one new instance */ | |
604 | hidg = kzalloc(sizeof *hidg, GFP_KERNEL); | |
605 | if (!hidg) | |
606 | return -ENOMEM; | |
607 | ||
608 | hidg->minor = index; | |
609 | hidg->bInterfaceSubClass = fdesc->subclass; | |
610 | hidg->bInterfaceProtocol = fdesc->protocol; | |
611 | hidg->report_length = fdesc->report_length; | |
612 | hidg->report_desc_length = fdesc->report_desc_length; | |
613 | hidg->report_desc = kmemdup(fdesc->report_desc, | |
614 | fdesc->report_desc_length, | |
615 | GFP_KERNEL); | |
616 | if (!hidg->report_desc) { | |
617 | kfree(hidg); | |
618 | return -ENOMEM; | |
619 | } | |
620 | ||
621 | hidg->func.name = "hid"; | |
622 | hidg->func.strings = ct_func_strings; | |
623 | hidg->func.bind = hidg_bind; | |
624 | hidg->func.unbind = hidg_unbind; | |
625 | hidg->func.set_alt = hidg_set_alt; | |
626 | hidg->func.disable = hidg_disable; | |
627 | hidg->func.setup = hidg_setup; | |
628 | ||
629 | status = usb_add_function(c, &hidg->func); | |
630 | if (status) | |
631 | kfree(hidg); | |
632 | ||
633 | return status; | |
634 | } | |
635 | ||
636 | int __init ghid_setup(struct usb_gadget *g, int count) | |
637 | { | |
638 | int status; | |
639 | dev_t dev; | |
640 | ||
641 | hidg_class = class_create(THIS_MODULE, "hidg"); | |
642 | ||
643 | status = alloc_chrdev_region(&dev, 0, count, "hidg"); | |
644 | if (!status) { | |
645 | major = MAJOR(dev); | |
646 | minors = count; | |
647 | } | |
648 | ||
649 | return status; | |
650 | } | |
651 | ||
652 | void ghid_cleanup(void) | |
653 | { | |
654 | if (major) { | |
655 | unregister_chrdev_region(MKDEV(major, 0), minors); | |
656 | major = minors = 0; | |
657 | } | |
658 | ||
659 | class_destroy(hidg_class); | |
660 | hidg_class = NULL; | |
661 | } |