Commit | Line | Data |
---|---|---|
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> | |
71adf118 FC |
13 | #include <linux/module.h> |
14 | #include <linux/hid.h> | |
cb382536 | 15 | #include <linux/idr.h> |
71adf118 FC |
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> | |
721e2e91 | 21 | #include <linux/sched.h> |
71adf118 FC |
22 | #include <linux/usb/g_hid.h> |
23 | ||
1efd54ea | 24 | #include "u_f.h" |
cb382536 AP |
25 | #include "u_hid.h" |
26 | ||
27 | #define HIDG_MINORS 4 | |
1efd54ea | 28 | |
71adf118 FC |
29 | static int major, minors; |
30 | static struct class *hidg_class; | |
cb382536 AP |
31 | static DEFINE_IDA(hidg_ida); |
32 | static DEFINE_MUTEX(hidg_ida_lock); /* protects access to hidg_ida */ | |
71adf118 FC |
33 | |
34 | /*-------------------------------------------------------------------------*/ | |
35 | /* HID gadget struct */ | |
36 | ||
99c51500 DM |
37 | struct f_hidg_req_list { |
38 | struct usb_request *req; | |
39 | unsigned int pos; | |
40 | struct list_head list; | |
41 | }; | |
42 | ||
71adf118 FC |
43 | struct f_hidg { |
44 | /* configuration */ | |
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 | /* recv report */ | |
99c51500 | 52 | struct list_head completed_out_req; |
71adf118 FC |
53 | spinlock_t spinlock; |
54 | wait_queue_head_t read_queue; | |
99c51500 | 55 | unsigned int qlen; |
71adf118 FC |
56 | |
57 | /* send report */ | |
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; | |
99c51500 | 66 | |
71adf118 | 67 | struct usb_ep *in_ep; |
99c51500 | 68 | struct usb_ep *out_ep; |
71adf118 FC |
69 | }; |
70 | ||
71 | static 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 | /* Static descriptors */ | |
78 | ||
79 | static struct usb_interface_descriptor hidg_interface_desc = { | |
80 | .bLength = sizeof hidg_interface_desc, | |
81 | .bDescriptorType = USB_DT_INTERFACE, | |
82 | /* .bInterfaceNumber = DYNAMIC */ | |
83 | .bAlternateSetting = 0, | |
99c51500 | 84 | .bNumEndpoints = 2, |
71adf118 FC |
85 | .bInterfaceClass = USB_CLASS_HID, |
86 | /* .bInterfaceSubClass = DYNAMIC */ | |
87 | /* .bInterfaceProtocol = DYNAMIC */ | |
88 | /* .iInterface = DYNAMIC */ | |
89 | }; | |
90 | ||
91 | static 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 | /*.desc[0].bDescriptorType = DYNAMIC */ | |
98 | /*.desc[0].wDescriptorLenght = DYNAMIC */ | |
99 | }; | |
100 | ||
dbf499cf JD |
101 | /* Super-Speed Support */ |
102 | ||
103 | static struct usb_endpoint_descriptor hidg_ss_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 | /*.wMaxPacketSize = DYNAMIC */ | |
109 | .bInterval = 4, /* FIXME: Add this field in the | |
110 | * HID gadget configuration? | |
111 | * (struct hidg_func_descriptor) | |
112 | */ | |
113 | }; | |
114 | ||
115 | static struct usb_ss_ep_comp_descriptor hidg_ss_in_comp_desc = { | |
116 | .bLength = sizeof(hidg_ss_in_comp_desc), | |
117 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, | |
118 | ||
119 | /* .bMaxBurst = 0, */ | |
120 | /* .bmAttributes = 0, */ | |
121 | /* .wBytesPerInterval = DYNAMIC */ | |
122 | }; | |
123 | ||
124 | static struct usb_endpoint_descriptor hidg_ss_out_ep_desc = { | |
125 | .bLength = USB_DT_ENDPOINT_SIZE, | |
126 | .bDescriptorType = USB_DT_ENDPOINT, | |
127 | .bEndpointAddress = USB_DIR_OUT, | |
128 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
129 | /*.wMaxPacketSize = DYNAMIC */ | |
130 | .bInterval = 4, /* FIXME: Add this field in the | |
131 | * HID gadget configuration? | |
132 | * (struct hidg_func_descriptor) | |
133 | */ | |
134 | }; | |
135 | ||
136 | static struct usb_ss_ep_comp_descriptor hidg_ss_out_comp_desc = { | |
137 | .bLength = sizeof(hidg_ss_out_comp_desc), | |
138 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, | |
139 | ||
140 | /* .bMaxBurst = 0, */ | |
141 | /* .bmAttributes = 0, */ | |
142 | /* .wBytesPerInterval = DYNAMIC */ | |
143 | }; | |
144 | ||
145 | static struct usb_descriptor_header *hidg_ss_descriptors[] = { | |
146 | (struct usb_descriptor_header *)&hidg_interface_desc, | |
147 | (struct usb_descriptor_header *)&hidg_desc, | |
148 | (struct usb_descriptor_header *)&hidg_ss_in_ep_desc, | |
149 | (struct usb_descriptor_header *)&hidg_ss_in_comp_desc, | |
150 | (struct usb_descriptor_header *)&hidg_ss_out_ep_desc, | |
151 | (struct usb_descriptor_header *)&hidg_ss_out_comp_desc, | |
152 | NULL, | |
153 | }; | |
154 | ||
71adf118 FC |
155 | /* High-Speed Support */ |
156 | ||
157 | static struct usb_endpoint_descriptor hidg_hs_in_ep_desc = { | |
158 | .bLength = USB_DT_ENDPOINT_SIZE, | |
159 | .bDescriptorType = USB_DT_ENDPOINT, | |
160 | .bEndpointAddress = USB_DIR_IN, | |
161 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
162 | /*.wMaxPacketSize = DYNAMIC */ | |
163 | .bInterval = 4, /* FIXME: Add this field in the | |
164 | * HID gadget configuration? | |
165 | * (struct hidg_func_descriptor) | |
166 | */ | |
167 | }; | |
168 | ||
99c51500 DM |
169 | static struct usb_endpoint_descriptor hidg_hs_out_ep_desc = { |
170 | .bLength = USB_DT_ENDPOINT_SIZE, | |
171 | .bDescriptorType = USB_DT_ENDPOINT, | |
172 | .bEndpointAddress = USB_DIR_OUT, | |
173 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
174 | /*.wMaxPacketSize = DYNAMIC */ | |
175 | .bInterval = 4, /* FIXME: Add this field in the | |
176 | * HID gadget configuration? | |
177 | * (struct hidg_func_descriptor) | |
178 | */ | |
179 | }; | |
180 | ||
71adf118 FC |
181 | static struct usb_descriptor_header *hidg_hs_descriptors[] = { |
182 | (struct usb_descriptor_header *)&hidg_interface_desc, | |
183 | (struct usb_descriptor_header *)&hidg_desc, | |
184 | (struct usb_descriptor_header *)&hidg_hs_in_ep_desc, | |
99c51500 | 185 | (struct usb_descriptor_header *)&hidg_hs_out_ep_desc, |
71adf118 FC |
186 | NULL, |
187 | }; | |
188 | ||
189 | /* Full-Speed Support */ | |
190 | ||
191 | static struct usb_endpoint_descriptor hidg_fs_in_ep_desc = { | |
192 | .bLength = USB_DT_ENDPOINT_SIZE, | |
193 | .bDescriptorType = USB_DT_ENDPOINT, | |
194 | .bEndpointAddress = USB_DIR_IN, | |
195 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
196 | /*.wMaxPacketSize = DYNAMIC */ | |
197 | .bInterval = 10, /* FIXME: Add this field in the | |
198 | * HID gadget configuration? | |
199 | * (struct hidg_func_descriptor) | |
200 | */ | |
201 | }; | |
202 | ||
99c51500 DM |
203 | static struct usb_endpoint_descriptor hidg_fs_out_ep_desc = { |
204 | .bLength = USB_DT_ENDPOINT_SIZE, | |
205 | .bDescriptorType = USB_DT_ENDPOINT, | |
206 | .bEndpointAddress = USB_DIR_OUT, | |
207 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
208 | /*.wMaxPacketSize = DYNAMIC */ | |
209 | .bInterval = 10, /* FIXME: Add this field in the | |
210 | * HID gadget configuration? | |
211 | * (struct hidg_func_descriptor) | |
212 | */ | |
213 | }; | |
214 | ||
71adf118 FC |
215 | static struct usb_descriptor_header *hidg_fs_descriptors[] = { |
216 | (struct usb_descriptor_header *)&hidg_interface_desc, | |
217 | (struct usb_descriptor_header *)&hidg_desc, | |
218 | (struct usb_descriptor_header *)&hidg_fs_in_ep_desc, | |
99c51500 | 219 | (struct usb_descriptor_header *)&hidg_fs_out_ep_desc, |
71adf118 FC |
220 | NULL, |
221 | }; | |
222 | ||
cb382536 AP |
223 | /*-------------------------------------------------------------------------*/ |
224 | /* Strings */ | |
225 | ||
226 | #define CT_FUNC_HID_IDX 0 | |
227 | ||
228 | static struct usb_string ct_func_string_defs[] = { | |
229 | [CT_FUNC_HID_IDX].s = "HID Interface", | |
230 | {}, /* end of list */ | |
231 | }; | |
232 | ||
233 | static struct usb_gadget_strings ct_func_string_table = { | |
234 | .language = 0x0409, /* en-US */ | |
235 | .strings = ct_func_string_defs, | |
236 | }; | |
237 | ||
238 | static struct usb_gadget_strings *ct_func_strings[] = { | |
239 | &ct_func_string_table, | |
240 | NULL, | |
241 | }; | |
242 | ||
71adf118 FC |
243 | /*-------------------------------------------------------------------------*/ |
244 | /* Char Device */ | |
245 | ||
246 | static ssize_t f_hidg_read(struct file *file, char __user *buffer, | |
247 | size_t count, loff_t *ptr) | |
248 | { | |
99c51500 DM |
249 | struct f_hidg *hidg = file->private_data; |
250 | struct f_hidg_req_list *list; | |
251 | struct usb_request *req; | |
252 | unsigned long flags; | |
253 | int ret; | |
71adf118 FC |
254 | |
255 | if (!count) | |
256 | return 0; | |
257 | ||
258 | if (!access_ok(VERIFY_WRITE, buffer, count)) | |
259 | return -EFAULT; | |
260 | ||
261 | spin_lock_irqsave(&hidg->spinlock, flags); | |
262 | ||
99c51500 | 263 | #define READ_COND (!list_empty(&hidg->completed_out_req)) |
71adf118 | 264 | |
99c51500 | 265 | /* wait for at least one buffer to complete */ |
71adf118 FC |
266 | while (!READ_COND) { |
267 | spin_unlock_irqrestore(&hidg->spinlock, flags); | |
268 | if (file->f_flags & O_NONBLOCK) | |
269 | return -EAGAIN; | |
270 | ||
271 | if (wait_event_interruptible(hidg->read_queue, READ_COND)) | |
272 | return -ERESTARTSYS; | |
273 | ||
274 | spin_lock_irqsave(&hidg->spinlock, flags); | |
275 | } | |
276 | ||
99c51500 DM |
277 | /* pick the first one */ |
278 | list = list_first_entry(&hidg->completed_out_req, | |
279 | struct f_hidg_req_list, list); | |
280 | req = list->req; | |
281 | count = min_t(unsigned int, count, req->actual - list->pos); | |
71adf118 FC |
282 | spin_unlock_irqrestore(&hidg->spinlock, flags); |
283 | ||
99c51500 DM |
284 | /* copy to user outside spinlock */ |
285 | count -= copy_to_user(buffer, req->buf + list->pos, count); | |
286 | list->pos += count; | |
287 | ||
288 | /* | |
289 | * if this request is completely handled and transfered to | |
290 | * userspace, remove its entry from the list and requeue it | |
291 | * again. Otherwise, we will revisit it again upon the next | |
292 | * call, taking into account its current read position. | |
293 | */ | |
294 | if (list->pos == req->actual) { | |
295 | spin_lock_irqsave(&hidg->spinlock, flags); | |
296 | list_del(&list->list); | |
297 | kfree(list); | |
298 | spin_unlock_irqrestore(&hidg->spinlock, flags); | |
299 | ||
300 | req->length = hidg->report_length; | |
301 | ret = usb_ep_queue(hidg->out_ep, req, GFP_KERNEL); | |
302 | if (ret < 0) | |
303 | return ret; | |
304 | } | |
71adf118 FC |
305 | |
306 | return count; | |
307 | } | |
308 | ||
309 | static void f_hidg_req_complete(struct usb_ep *ep, struct usb_request *req) | |
310 | { | |
311 | struct f_hidg *hidg = (struct f_hidg *)ep->driver_data; | |
312 | ||
313 | if (req->status != 0) { | |
314 | ERROR(hidg->func.config->cdev, | |
315 | "End Point Request ERROR: %d\n", req->status); | |
316 | } | |
317 | ||
318 | hidg->write_pending = 0; | |
319 | wake_up(&hidg->write_queue); | |
320 | } | |
321 | ||
322 | static ssize_t f_hidg_write(struct file *file, const char __user *buffer, | |
323 | size_t count, loff_t *offp) | |
324 | { | |
fd63b10b | 325 | struct f_hidg *hidg = file->private_data; |
71adf118 FC |
326 | ssize_t status = -ENOMEM; |
327 | ||
328 | if (!access_ok(VERIFY_READ, buffer, count)) | |
329 | return -EFAULT; | |
330 | ||
331 | mutex_lock(&hidg->lock); | |
332 | ||
333 | #define WRITE_COND (!hidg->write_pending) | |
334 | ||
335 | /* write queue */ | |
336 | while (!WRITE_COND) { | |
337 | mutex_unlock(&hidg->lock); | |
338 | if (file->f_flags & O_NONBLOCK) | |
339 | return -EAGAIN; | |
340 | ||
341 | if (wait_event_interruptible_exclusive( | |
342 | hidg->write_queue, WRITE_COND)) | |
343 | return -ERESTARTSYS; | |
344 | ||
345 | mutex_lock(&hidg->lock); | |
346 | } | |
347 | ||
348 | count = min_t(unsigned, count, hidg->report_length); | |
349 | status = copy_from_user(hidg->req->buf, buffer, count); | |
350 | ||
351 | if (status != 0) { | |
352 | ERROR(hidg->func.config->cdev, | |
353 | "copy_from_user error\n"); | |
354 | mutex_unlock(&hidg->lock); | |
355 | return -EINVAL; | |
356 | } | |
357 | ||
358 | hidg->req->status = 0; | |
359 | hidg->req->zero = 0; | |
360 | hidg->req->length = count; | |
361 | hidg->req->complete = f_hidg_req_complete; | |
362 | hidg->req->context = hidg; | |
363 | hidg->write_pending = 1; | |
364 | ||
365 | status = usb_ep_queue(hidg->in_ep, hidg->req, GFP_ATOMIC); | |
366 | if (status < 0) { | |
367 | ERROR(hidg->func.config->cdev, | |
368 | "usb_ep_queue error on int endpoint %zd\n", status); | |
369 | hidg->write_pending = 0; | |
370 | wake_up(&hidg->write_queue); | |
371 | } else { | |
372 | status = count; | |
373 | } | |
374 | ||
375 | mutex_unlock(&hidg->lock); | |
376 | ||
377 | return status; | |
378 | } | |
379 | ||
380 | static unsigned int f_hidg_poll(struct file *file, poll_table *wait) | |
381 | { | |
fd63b10b | 382 | struct f_hidg *hidg = file->private_data; |
71adf118 FC |
383 | unsigned int ret = 0; |
384 | ||
385 | poll_wait(file, &hidg->read_queue, wait); | |
386 | poll_wait(file, &hidg->write_queue, wait); | |
387 | ||
388 | if (WRITE_COND) | |
389 | ret |= POLLOUT | POLLWRNORM; | |
390 | ||
391 | if (READ_COND) | |
392 | ret |= POLLIN | POLLRDNORM; | |
393 | ||
394 | return ret; | |
395 | } | |
396 | ||
397 | #undef WRITE_COND | |
398 | #undef READ_COND | |
399 | ||
400 | static int f_hidg_release(struct inode *inode, struct file *fd) | |
401 | { | |
402 | fd->private_data = NULL; | |
403 | return 0; | |
404 | } | |
405 | ||
406 | static int f_hidg_open(struct inode *inode, struct file *fd) | |
407 | { | |
408 | struct f_hidg *hidg = | |
409 | container_of(inode->i_cdev, struct f_hidg, cdev); | |
410 | ||
411 | fd->private_data = hidg; | |
412 | ||
413 | return 0; | |
414 | } | |
415 | ||
416 | /*-------------------------------------------------------------------------*/ | |
417 | /* usb_function */ | |
418 | ||
1efd54ea AP |
419 | static inline struct usb_request *hidg_alloc_ep_req(struct usb_ep *ep, |
420 | unsigned length) | |
71adf118 | 421 | { |
aadbe812 | 422 | return alloc_ep_req(ep, length); |
99c51500 | 423 | } |
71adf118 | 424 | |
99c51500 DM |
425 | static void hidg_set_report_complete(struct usb_ep *ep, struct usb_request *req) |
426 | { | |
427 | struct f_hidg *hidg = (struct f_hidg *) req->context; | |
428 | struct f_hidg_req_list *req_list; | |
429 | unsigned long flags; | |
71adf118 | 430 | |
99c51500 DM |
431 | req_list = kzalloc(sizeof(*req_list), GFP_ATOMIC); |
432 | if (!req_list) | |
71adf118 | 433 | return; |
71adf118 | 434 | |
99c51500 DM |
435 | req_list->req = req; |
436 | ||
437 | spin_lock_irqsave(&hidg->spinlock, flags); | |
438 | list_add_tail(&req_list->list, &hidg->completed_out_req); | |
439 | spin_unlock_irqrestore(&hidg->spinlock, flags); | |
71adf118 FC |
440 | |
441 | wake_up(&hidg->read_queue); | |
71adf118 FC |
442 | } |
443 | ||
444 | static int hidg_setup(struct usb_function *f, | |
445 | const struct usb_ctrlrequest *ctrl) | |
446 | { | |
447 | struct f_hidg *hidg = func_to_hidg(f); | |
448 | struct usb_composite_dev *cdev = f->config->cdev; | |
449 | struct usb_request *req = cdev->req; | |
450 | int status = 0; | |
451 | __u16 value, length; | |
452 | ||
453 | value = __le16_to_cpu(ctrl->wValue); | |
454 | length = __le16_to_cpu(ctrl->wLength); | |
455 | ||
c9b3bde0 JL |
456 | VDBG(cdev, |
457 | "%s crtl_request : bRequestType:0x%x bRequest:0x%x Value:0x%x\n", | |
458 | __func__, ctrl->bRequestType, ctrl->bRequest, value); | |
71adf118 FC |
459 | |
460 | switch ((ctrl->bRequestType << 8) | ctrl->bRequest) { | |
461 | case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
462 | | HID_REQ_GET_REPORT): | |
463 | VDBG(cdev, "get_report\n"); | |
464 | ||
465 | /* send an empty report */ | |
466 | length = min_t(unsigned, length, hidg->report_length); | |
467 | memset(req->buf, 0x0, length); | |
468 | ||
469 | goto respond; | |
470 | break; | |
471 | ||
472 | case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
473 | | HID_REQ_GET_PROTOCOL): | |
474 | VDBG(cdev, "get_protocol\n"); | |
475 | goto stall; | |
476 | break; | |
477 | ||
478 | case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
479 | | HID_REQ_SET_REPORT): | |
6774def6 | 480 | VDBG(cdev, "set_report | wLength=%d\n", ctrl->wLength); |
99c51500 | 481 | goto stall; |
71adf118 FC |
482 | break; |
483 | ||
484 | case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
485 | | HID_REQ_SET_PROTOCOL): | |
486 | VDBG(cdev, "set_protocol\n"); | |
487 | goto stall; | |
488 | break; | |
489 | ||
490 | case ((USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_INTERFACE) << 8 | |
491 | | USB_REQ_GET_DESCRIPTOR): | |
492 | switch (value >> 8) { | |
c240d78a | 493 | case HID_DT_HID: |
f286d487 KO |
494 | { |
495 | struct hid_descriptor hidg_desc_copy = hidg_desc; | |
496 | ||
c240d78a | 497 | VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: HID\n"); |
f286d487 KO |
498 | hidg_desc_copy.desc[0].bDescriptorType = HID_DT_REPORT; |
499 | hidg_desc_copy.desc[0].wDescriptorLength = | |
500 | cpu_to_le16(hidg->report_desc_length); | |
501 | ||
c240d78a | 502 | length = min_t(unsigned short, length, |
f286d487 KO |
503 | hidg_desc_copy.bLength); |
504 | memcpy(req->buf, &hidg_desc_copy, length); | |
c240d78a SB |
505 | goto respond; |
506 | break; | |
f286d487 | 507 | } |
71adf118 FC |
508 | case HID_DT_REPORT: |
509 | VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: REPORT\n"); | |
510 | length = min_t(unsigned short, length, | |
511 | hidg->report_desc_length); | |
512 | memcpy(req->buf, hidg->report_desc, length); | |
513 | goto respond; | |
514 | break; | |
515 | ||
516 | default: | |
1c1301dd | 517 | VDBG(cdev, "Unknown descriptor request 0x%x\n", |
71adf118 FC |
518 | value >> 8); |
519 | goto stall; | |
520 | break; | |
521 | } | |
522 | break; | |
523 | ||
524 | default: | |
525 | VDBG(cdev, "Unknown request 0x%x\n", | |
526 | ctrl->bRequest); | |
527 | goto stall; | |
528 | break; | |
529 | } | |
530 | ||
531 | stall: | |
532 | return -EOPNOTSUPP; | |
533 | ||
534 | respond: | |
535 | req->zero = 0; | |
536 | req->length = length; | |
537 | status = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); | |
538 | if (status < 0) | |
539 | ERROR(cdev, "usb_ep_queue error on ep0 %d\n", value); | |
540 | return status; | |
541 | } | |
542 | ||
543 | static void hidg_disable(struct usb_function *f) | |
544 | { | |
545 | struct f_hidg *hidg = func_to_hidg(f); | |
99c51500 | 546 | struct f_hidg_req_list *list, *next; |
71adf118 FC |
547 | |
548 | usb_ep_disable(hidg->in_ep); | |
99c51500 | 549 | usb_ep_disable(hidg->out_ep); |
99c51500 DM |
550 | |
551 | list_for_each_entry_safe(list, next, &hidg->completed_out_req, list) { | |
552 | list_del(&list->list); | |
553 | kfree(list); | |
554 | } | |
71adf118 FC |
555 | } |
556 | ||
557 | static int hidg_set_alt(struct usb_function *f, unsigned intf, unsigned alt) | |
558 | { | |
559 | struct usb_composite_dev *cdev = f->config->cdev; | |
560 | struct f_hidg *hidg = func_to_hidg(f); | |
99c51500 | 561 | int i, status = 0; |
71adf118 FC |
562 | |
563 | VDBG(cdev, "hidg_set_alt intf:%d alt:%d\n", intf, alt); | |
564 | ||
565 | if (hidg->in_ep != NULL) { | |
566 | /* restart endpoint */ | |
2516a680 | 567 | usb_ep_disable(hidg->in_ep); |
71adf118 | 568 | |
ea2a1df7 TB |
569 | status = config_ep_by_speed(f->config->cdev->gadget, f, |
570 | hidg->in_ep); | |
571 | if (status) { | |
572 | ERROR(cdev, "config_ep_by_speed FAILED!\n"); | |
573 | goto fail; | |
574 | } | |
72c973dd | 575 | status = usb_ep_enable(hidg->in_ep); |
71adf118 | 576 | if (status < 0) { |
99c51500 | 577 | ERROR(cdev, "Enable IN endpoint FAILED!\n"); |
71adf118 FC |
578 | goto fail; |
579 | } | |
580 | hidg->in_ep->driver_data = hidg; | |
581 | } | |
99c51500 DM |
582 | |
583 | ||
584 | if (hidg->out_ep != NULL) { | |
585 | /* restart endpoint */ | |
2516a680 | 586 | usb_ep_disable(hidg->out_ep); |
99c51500 DM |
587 | |
588 | status = config_ep_by_speed(f->config->cdev->gadget, f, | |
589 | hidg->out_ep); | |
590 | if (status) { | |
591 | ERROR(cdev, "config_ep_by_speed FAILED!\n"); | |
592 | goto fail; | |
593 | } | |
594 | status = usb_ep_enable(hidg->out_ep); | |
595 | if (status < 0) { | |
596 | ERROR(cdev, "Enable IN endpoint FAILED!\n"); | |
597 | goto fail; | |
598 | } | |
599 | hidg->out_ep->driver_data = hidg; | |
600 | ||
601 | /* | |
602 | * allocate a bunch of read buffers and queue them all at once. | |
603 | */ | |
604 | for (i = 0; i < hidg->qlen && status == 0; i++) { | |
605 | struct usb_request *req = | |
606 | hidg_alloc_ep_req(hidg->out_ep, | |
607 | hidg->report_length); | |
608 | if (req) { | |
609 | req->complete = hidg_set_report_complete; | |
610 | req->context = hidg; | |
611 | status = usb_ep_queue(hidg->out_ep, req, | |
612 | GFP_ATOMIC); | |
613 | if (status) | |
614 | ERROR(cdev, "%s queue req --> %d\n", | |
615 | hidg->out_ep->name, status); | |
616 | } else { | |
617 | usb_ep_disable(hidg->out_ep); | |
99c51500 DM |
618 | status = -ENOMEM; |
619 | goto fail; | |
620 | } | |
621 | } | |
622 | } | |
623 | ||
71adf118 FC |
624 | fail: |
625 | return status; | |
626 | } | |
627 | ||
7a3cc461 | 628 | static const struct file_operations f_hidg_fops = { |
71adf118 FC |
629 | .owner = THIS_MODULE, |
630 | .open = f_hidg_open, | |
631 | .release = f_hidg_release, | |
632 | .write = f_hidg_write, | |
633 | .read = f_hidg_read, | |
634 | .poll = f_hidg_poll, | |
6038f373 | 635 | .llseek = noop_llseek, |
71adf118 FC |
636 | }; |
637 | ||
cb382536 | 638 | static int hidg_bind(struct usb_configuration *c, struct usb_function *f) |
71adf118 FC |
639 | { |
640 | struct usb_ep *ep; | |
641 | struct f_hidg *hidg = func_to_hidg(f); | |
5ca8d3ec | 642 | struct usb_string *us; |
63406087 | 643 | struct device *device; |
71adf118 FC |
644 | int status; |
645 | dev_t dev; | |
646 | ||
cb382536 | 647 | /* maybe allocate device-global string IDs, and patch descriptors */ |
5ca8d3ec AP |
648 | us = usb_gstrings_attach(c->cdev, ct_func_strings, |
649 | ARRAY_SIZE(ct_func_string_defs)); | |
650 | if (IS_ERR(us)) | |
651 | return PTR_ERR(us); | |
652 | hidg_interface_desc.iInterface = us[CT_FUNC_HID_IDX].id; | |
cb382536 | 653 | |
71adf118 FC |
654 | /* allocate instance-specific interface IDs, and patch descriptors */ |
655 | status = usb_interface_id(c, f); | |
656 | if (status < 0) | |
657 | goto fail; | |
658 | hidg_interface_desc.bInterfaceNumber = status; | |
659 | ||
71adf118 FC |
660 | /* allocate instance-specific endpoints */ |
661 | status = -ENODEV; | |
662 | ep = usb_ep_autoconfig(c->cdev->gadget, &hidg_fs_in_ep_desc); | |
663 | if (!ep) | |
664 | goto fail; | |
71adf118 FC |
665 | hidg->in_ep = ep; |
666 | ||
99c51500 DM |
667 | ep = usb_ep_autoconfig(c->cdev->gadget, &hidg_fs_out_ep_desc); |
668 | if (!ep) | |
669 | goto fail; | |
99c51500 DM |
670 | hidg->out_ep = ep; |
671 | ||
71adf118 FC |
672 | /* preallocate request and buffer */ |
673 | status = -ENOMEM; | |
ba1582f2 | 674 | hidg->req = alloc_ep_req(hidg->in_ep, hidg->report_length); |
71adf118 FC |
675 | if (!hidg->req) |
676 | goto fail; | |
677 | ||
71adf118 FC |
678 | /* set descriptor dynamic values */ |
679 | hidg_interface_desc.bInterfaceSubClass = hidg->bInterfaceSubClass; | |
680 | hidg_interface_desc.bInterfaceProtocol = hidg->bInterfaceProtocol; | |
dbf499cf JD |
681 | hidg_ss_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); |
682 | hidg_ss_in_comp_desc.wBytesPerInterval = | |
683 | cpu_to_le16(hidg->report_length); | |
71adf118 FC |
684 | hidg_hs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); |
685 | hidg_fs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); | |
dbf499cf JD |
686 | hidg_ss_out_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); |
687 | hidg_ss_out_comp_desc.wBytesPerInterval = | |
688 | cpu_to_le16(hidg->report_length); | |
99c51500 DM |
689 | hidg_hs_out_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); |
690 | hidg_fs_out_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); | |
f286d487 KO |
691 | /* |
692 | * We can use hidg_desc struct here but we should not relay | |
693 | * that its content won't change after returning from this function. | |
694 | */ | |
71adf118 FC |
695 | hidg_desc.desc[0].bDescriptorType = HID_DT_REPORT; |
696 | hidg_desc.desc[0].wDescriptorLength = | |
697 | cpu_to_le16(hidg->report_desc_length); | |
698 | ||
10287bae SAS |
699 | hidg_hs_in_ep_desc.bEndpointAddress = |
700 | hidg_fs_in_ep_desc.bEndpointAddress; | |
701 | hidg_hs_out_ep_desc.bEndpointAddress = | |
702 | hidg_fs_out_ep_desc.bEndpointAddress; | |
71adf118 | 703 | |
dbf499cf JD |
704 | hidg_ss_in_ep_desc.bEndpointAddress = |
705 | hidg_fs_in_ep_desc.bEndpointAddress; | |
706 | hidg_ss_out_ep_desc.bEndpointAddress = | |
707 | hidg_fs_out_ep_desc.bEndpointAddress; | |
708 | ||
10287bae | 709 | status = usb_assign_descriptors(f, hidg_fs_descriptors, |
dbf499cf | 710 | hidg_hs_descriptors, hidg_ss_descriptors, NULL); |
10287bae SAS |
711 | if (status) |
712 | goto fail; | |
71adf118 FC |
713 | |
714 | mutex_init(&hidg->lock); | |
715 | spin_lock_init(&hidg->spinlock); | |
716 | init_waitqueue_head(&hidg->write_queue); | |
717 | init_waitqueue_head(&hidg->read_queue); | |
99c51500 | 718 | INIT_LIST_HEAD(&hidg->completed_out_req); |
71adf118 FC |
719 | |
720 | /* create char device */ | |
721 | cdev_init(&hidg->cdev, &f_hidg_fops); | |
722 | dev = MKDEV(major, hidg->minor); | |
723 | status = cdev_add(&hidg->cdev, dev, 1); | |
724 | if (status) | |
d12a8727 | 725 | goto fail_free_descs; |
71adf118 | 726 | |
63406087 AP |
727 | device = device_create(hidg_class, NULL, dev, NULL, |
728 | "%s%d", "hidg", hidg->minor); | |
729 | if (IS_ERR(device)) { | |
730 | status = PTR_ERR(device); | |
731 | goto del; | |
732 | } | |
71adf118 FC |
733 | |
734 | return 0; | |
63406087 AP |
735 | del: |
736 | cdev_del(&hidg->cdev); | |
d12a8727 PM |
737 | fail_free_descs: |
738 | usb_free_all_descriptors(f); | |
71adf118 FC |
739 | fail: |
740 | ERROR(f->config->cdev, "hidg_bind FAILED\n"); | |
14794d71 FT |
741 | if (hidg->req != NULL) |
742 | free_ep_req(hidg->in_ep, hidg->req); | |
71adf118 | 743 | |
71adf118 FC |
744 | return status; |
745 | } | |
746 | ||
cb382536 | 747 | static inline int hidg_get_minor(void) |
71adf118 | 748 | { |
cb382536 | 749 | int ret; |
71adf118 | 750 | |
cb382536 | 751 | ret = ida_simple_get(&hidg_ida, 0, 0, GFP_KERNEL); |
774cf72f AP |
752 | if (ret >= HIDG_MINORS) { |
753 | ida_simple_remove(&hidg_ida, ret); | |
754 | ret = -ENODEV; | |
755 | } | |
71adf118 | 756 | |
cb382536 AP |
757 | return ret; |
758 | } | |
71adf118 | 759 | |
21a9476a AP |
760 | static inline struct f_hid_opts *to_f_hid_opts(struct config_item *item) |
761 | { | |
762 | return container_of(to_config_group(item), struct f_hid_opts, | |
763 | func_inst.group); | |
71adf118 FC |
764 | } |
765 | ||
21a9476a AP |
766 | static void hid_attr_release(struct config_item *item) |
767 | { | |
768 | struct f_hid_opts *opts = to_f_hid_opts(item); | |
71adf118 | 769 | |
21a9476a AP |
770 | usb_put_function_instance(&opts->func_inst); |
771 | } | |
71adf118 | 772 | |
21a9476a AP |
773 | static struct configfs_item_operations hidg_item_ops = { |
774 | .release = hid_attr_release, | |
71adf118 FC |
775 | }; |
776 | ||
21a9476a | 777 | #define F_HID_OPT(name, prec, limit) \ |
da4e527c | 778 | static ssize_t f_hid_opts_##name##_show(struct config_item *item, char *page)\ |
21a9476a | 779 | { \ |
da4e527c | 780 | struct f_hid_opts *opts = to_f_hid_opts(item); \ |
21a9476a AP |
781 | int result; \ |
782 | \ | |
783 | mutex_lock(&opts->lock); \ | |
784 | result = sprintf(page, "%d\n", opts->name); \ | |
785 | mutex_unlock(&opts->lock); \ | |
786 | \ | |
787 | return result; \ | |
788 | } \ | |
789 | \ | |
da4e527c | 790 | static ssize_t f_hid_opts_##name##_store(struct config_item *item, \ |
21a9476a AP |
791 | const char *page, size_t len) \ |
792 | { \ | |
da4e527c | 793 | struct f_hid_opts *opts = to_f_hid_opts(item); \ |
21a9476a AP |
794 | int ret; \ |
795 | u##prec num; \ | |
796 | \ | |
797 | mutex_lock(&opts->lock); \ | |
798 | if (opts->refcnt) { \ | |
799 | ret = -EBUSY; \ | |
800 | goto end; \ | |
801 | } \ | |
802 | \ | |
803 | ret = kstrtou##prec(page, 0, &num); \ | |
804 | if (ret) \ | |
805 | goto end; \ | |
806 | \ | |
807 | if (num > limit) { \ | |
808 | ret = -EINVAL; \ | |
809 | goto end; \ | |
810 | } \ | |
811 | opts->name = num; \ | |
812 | ret = len; \ | |
813 | \ | |
814 | end: \ | |
815 | mutex_unlock(&opts->lock); \ | |
816 | return ret; \ | |
817 | } \ | |
818 | \ | |
da4e527c | 819 | CONFIGFS_ATTR(f_hid_opts_, name) |
21a9476a AP |
820 | |
821 | F_HID_OPT(subclass, 8, 255); | |
822 | F_HID_OPT(protocol, 8, 255); | |
39a2ac27 | 823 | F_HID_OPT(report_length, 16, 65535); |
21a9476a | 824 | |
da4e527c | 825 | static ssize_t f_hid_opts_report_desc_show(struct config_item *item, char *page) |
21a9476a | 826 | { |
da4e527c | 827 | struct f_hid_opts *opts = to_f_hid_opts(item); |
21a9476a AP |
828 | int result; |
829 | ||
830 | mutex_lock(&opts->lock); | |
831 | result = opts->report_desc_length; | |
832 | memcpy(page, opts->report_desc, opts->report_desc_length); | |
833 | mutex_unlock(&opts->lock); | |
834 | ||
835 | return result; | |
836 | } | |
837 | ||
da4e527c | 838 | static ssize_t f_hid_opts_report_desc_store(struct config_item *item, |
21a9476a AP |
839 | const char *page, size_t len) |
840 | { | |
da4e527c | 841 | struct f_hid_opts *opts = to_f_hid_opts(item); |
21a9476a AP |
842 | int ret = -EBUSY; |
843 | char *d; | |
844 | ||
845 | mutex_lock(&opts->lock); | |
846 | ||
847 | if (opts->refcnt) | |
848 | goto end; | |
849 | if (len > PAGE_SIZE) { | |
850 | ret = -ENOSPC; | |
851 | goto end; | |
852 | } | |
853 | d = kmemdup(page, len, GFP_KERNEL); | |
854 | if (!d) { | |
855 | ret = -ENOMEM; | |
856 | goto end; | |
857 | } | |
858 | kfree(opts->report_desc); | |
859 | opts->report_desc = d; | |
860 | opts->report_desc_length = len; | |
861 | opts->report_desc_alloc = true; | |
862 | ret = len; | |
863 | end: | |
864 | mutex_unlock(&opts->lock); | |
865 | return ret; | |
866 | } | |
867 | ||
da4e527c | 868 | CONFIGFS_ATTR(f_hid_opts_, report_desc); |
21a9476a | 869 | |
ed6fe1f5 JB |
870 | static ssize_t f_hid_opts_dev_show(struct config_item *item, char *page) |
871 | { | |
872 | struct f_hid_opts *opts = to_f_hid_opts(item); | |
873 | ||
874 | return sprintf(page, "%d:%d\n", major, opts->minor); | |
875 | } | |
876 | ||
877 | CONFIGFS_ATTR_RO(f_hid_opts_, dev); | |
878 | ||
21a9476a | 879 | static struct configfs_attribute *hid_attrs[] = { |
da4e527c CH |
880 | &f_hid_opts_attr_subclass, |
881 | &f_hid_opts_attr_protocol, | |
882 | &f_hid_opts_attr_report_length, | |
883 | &f_hid_opts_attr_report_desc, | |
ed6fe1f5 | 884 | &f_hid_opts_attr_dev, |
71adf118 FC |
885 | NULL, |
886 | }; | |
887 | ||
21a9476a AP |
888 | static struct config_item_type hid_func_type = { |
889 | .ct_item_ops = &hidg_item_ops, | |
890 | .ct_attrs = hid_attrs, | |
891 | .ct_owner = THIS_MODULE, | |
892 | }; | |
71adf118 | 893 | |
cb382536 | 894 | static inline void hidg_put_minor(int minor) |
71adf118 | 895 | { |
cb382536 AP |
896 | ida_simple_remove(&hidg_ida, minor); |
897 | } | |
71adf118 | 898 | |
cb382536 AP |
899 | static void hidg_free_inst(struct usb_function_instance *f) |
900 | { | |
901 | struct f_hid_opts *opts; | |
71adf118 | 902 | |
cb382536 AP |
903 | opts = container_of(f, struct f_hid_opts, func_inst); |
904 | ||
905 | mutex_lock(&hidg_ida_lock); | |
906 | ||
907 | hidg_put_minor(opts->minor); | |
908 | if (idr_is_empty(&hidg_ida.idr)) | |
909 | ghid_cleanup(); | |
910 | ||
911 | mutex_unlock(&hidg_ida_lock); | |
912 | ||
913 | if (opts->report_desc_alloc) | |
914 | kfree(opts->report_desc); | |
915 | ||
916 | kfree(opts); | |
917 | } | |
918 | ||
919 | static struct usb_function_instance *hidg_alloc_inst(void) | |
920 | { | |
921 | struct f_hid_opts *opts; | |
922 | struct usb_function_instance *ret; | |
923 | int status = 0; | |
924 | ||
925 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
926 | if (!opts) | |
927 | return ERR_PTR(-ENOMEM); | |
21a9476a | 928 | mutex_init(&opts->lock); |
cb382536 AP |
929 | opts->func_inst.free_func_inst = hidg_free_inst; |
930 | ret = &opts->func_inst; | |
931 | ||
932 | mutex_lock(&hidg_ida_lock); | |
933 | ||
934 | if (idr_is_empty(&hidg_ida.idr)) { | |
935 | status = ghid_setup(NULL, HIDG_MINORS); | |
936 | if (status) { | |
937 | ret = ERR_PTR(status); | |
938 | kfree(opts); | |
939 | goto unlock; | |
940 | } | |
941 | } | |
942 | ||
943 | opts->minor = hidg_get_minor(); | |
944 | if (opts->minor < 0) { | |
945 | ret = ERR_PTR(opts->minor); | |
946 | kfree(opts); | |
947 | if (idr_is_empty(&hidg_ida.idr)) | |
948 | ghid_cleanup(); | |
828f6148 | 949 | goto unlock; |
71adf118 | 950 | } |
21a9476a | 951 | config_group_init_type_name(&opts->func_inst.group, "", &hid_func_type); |
cb382536 AP |
952 | |
953 | unlock: | |
954 | mutex_unlock(&hidg_ida_lock); | |
955 | return ret; | |
956 | } | |
957 | ||
958 | static void hidg_free(struct usb_function *f) | |
959 | { | |
960 | struct f_hidg *hidg; | |
21a9476a | 961 | struct f_hid_opts *opts; |
cb382536 AP |
962 | |
963 | hidg = func_to_hidg(f); | |
21a9476a | 964 | opts = container_of(f->fi, struct f_hid_opts, func_inst); |
cb382536 AP |
965 | kfree(hidg->report_desc); |
966 | kfree(hidg); | |
21a9476a AP |
967 | mutex_lock(&opts->lock); |
968 | --opts->refcnt; | |
969 | mutex_unlock(&opts->lock); | |
cb382536 AP |
970 | } |
971 | ||
972 | static void hidg_unbind(struct usb_configuration *c, struct usb_function *f) | |
973 | { | |
974 | struct f_hidg *hidg = func_to_hidg(f); | |
975 | ||
976 | device_destroy(hidg_class, MKDEV(major, hidg->minor)); | |
977 | cdev_del(&hidg->cdev); | |
978 | ||
979 | /* disable/free request and end point */ | |
980 | usb_ep_disable(hidg->in_ep); | |
14794d71 | 981 | free_ep_req(hidg->in_ep, hidg->req); |
cb382536 AP |
982 | |
983 | usb_free_all_descriptors(f); | |
984 | } | |
985 | ||
0fc57ea0 | 986 | static struct usb_function *hidg_alloc(struct usb_function_instance *fi) |
cb382536 AP |
987 | { |
988 | struct f_hidg *hidg; | |
989 | struct f_hid_opts *opts; | |
71adf118 FC |
990 | |
991 | /* allocate and initialize one new instance */ | |
cb382536 | 992 | hidg = kzalloc(sizeof(*hidg), GFP_KERNEL); |
71adf118 | 993 | if (!hidg) |
cb382536 AP |
994 | return ERR_PTR(-ENOMEM); |
995 | ||
996 | opts = container_of(fi, struct f_hid_opts, func_inst); | |
997 | ||
21a9476a AP |
998 | mutex_lock(&opts->lock); |
999 | ++opts->refcnt; | |
1000 | ||
cb382536 AP |
1001 | hidg->minor = opts->minor; |
1002 | hidg->bInterfaceSubClass = opts->subclass; | |
1003 | hidg->bInterfaceProtocol = opts->protocol; | |
1004 | hidg->report_length = opts->report_length; | |
1005 | hidg->report_desc_length = opts->report_desc_length; | |
1006 | if (opts->report_desc) { | |
1007 | hidg->report_desc = kmemdup(opts->report_desc, | |
1008 | opts->report_desc_length, | |
1009 | GFP_KERNEL); | |
1010 | if (!hidg->report_desc) { | |
1011 | kfree(hidg); | |
21a9476a | 1012 | mutex_unlock(&opts->lock); |
cb382536 AP |
1013 | return ERR_PTR(-ENOMEM); |
1014 | } | |
71adf118 FC |
1015 | } |
1016 | ||
21a9476a AP |
1017 | mutex_unlock(&opts->lock); |
1018 | ||
71adf118 | 1019 | hidg->func.name = "hid"; |
71adf118 FC |
1020 | hidg->func.bind = hidg_bind; |
1021 | hidg->func.unbind = hidg_unbind; | |
1022 | hidg->func.set_alt = hidg_set_alt; | |
1023 | hidg->func.disable = hidg_disable; | |
1024 | hidg->func.setup = hidg_setup; | |
cb382536 | 1025 | hidg->func.free_func = hidg_free; |
71adf118 | 1026 | |
99c51500 DM |
1027 | /* this could me made configurable at some point */ |
1028 | hidg->qlen = 4; | |
1029 | ||
cb382536 | 1030 | return &hidg->func; |
71adf118 FC |
1031 | } |
1032 | ||
cb382536 AP |
1033 | DECLARE_USB_FUNCTION_INIT(hid, hidg_alloc_inst, hidg_alloc); |
1034 | MODULE_LICENSE("GPL"); | |
1035 | MODULE_AUTHOR("Fabien Chouteau"); | |
1036 | ||
cb382536 | 1037 | int ghid_setup(struct usb_gadget *g, int count) |
71adf118 FC |
1038 | { |
1039 | int status; | |
1040 | dev_t dev; | |
1041 | ||
1042 | hidg_class = class_create(THIS_MODULE, "hidg"); | |
06529407 | 1043 | if (IS_ERR(hidg_class)) { |
0448d38c | 1044 | status = PTR_ERR(hidg_class); |
06529407 | 1045 | hidg_class = NULL; |
0448d38c | 1046 | return status; |
06529407 | 1047 | } |
71adf118 FC |
1048 | |
1049 | status = alloc_chrdev_region(&dev, 0, count, "hidg"); | |
0448d38c DC |
1050 | if (status) { |
1051 | class_destroy(hidg_class); | |
1052 | hidg_class = NULL; | |
1053 | return status; | |
71adf118 FC |
1054 | } |
1055 | ||
0448d38c DC |
1056 | major = MAJOR(dev); |
1057 | minors = count; | |
1058 | ||
1059 | return 0; | |
71adf118 FC |
1060 | } |
1061 | ||
1062 | void ghid_cleanup(void) | |
1063 | { | |
1064 | if (major) { | |
1065 | unregister_chrdev_region(MKDEV(major, 0), minors); | |
1066 | major = minors = 0; | |
1067 | } | |
1068 | ||
1069 | class_destroy(hidg_class); | |
1070 | hidg_class = NULL; | |
1071 | } |