]>
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; |
33e4c1a9 | 53 | spinlock_t read_spinlock; |
71adf118 | 54 | wait_queue_head_t read_queue; |
99c51500 | 55 | unsigned int qlen; |
71adf118 FC |
56 | |
57 | /* send report */ | |
33e4c1a9 | 58 | spinlock_t write_spinlock; |
71adf118 FC |
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 | ||
33e4c1a9 | 261 | spin_lock_irqsave(&hidg->read_spinlock, flags); |
71adf118 | 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 | 266 | while (!READ_COND) { |
33e4c1a9 | 267 | spin_unlock_irqrestore(&hidg->read_spinlock, flags); |
71adf118 FC |
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 | ||
33e4c1a9 | 274 | spin_lock_irqsave(&hidg->read_spinlock, flags); |
71adf118 FC |
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); | |
aa65d11a KO |
280 | |
281 | /* | |
282 | * Remove this from list to protect it from beign free() | |
283 | * while host disables our function | |
284 | */ | |
285 | list_del(&list->list); | |
286 | ||
99c51500 DM |
287 | req = list->req; |
288 | count = min_t(unsigned int, count, req->actual - list->pos); | |
33e4c1a9 | 289 | spin_unlock_irqrestore(&hidg->read_spinlock, flags); |
71adf118 | 290 | |
99c51500 DM |
291 | /* copy to user outside spinlock */ |
292 | count -= copy_to_user(buffer, req->buf + list->pos, count); | |
293 | list->pos += count; | |
294 | ||
295 | /* | |
296 | * if this request is completely handled and transfered to | |
297 | * userspace, remove its entry from the list and requeue it | |
298 | * again. Otherwise, we will revisit it again upon the next | |
299 | * call, taking into account its current read position. | |
300 | */ | |
301 | if (list->pos == req->actual) { | |
99c51500 | 302 | kfree(list); |
99c51500 DM |
303 | |
304 | req->length = hidg->report_length; | |
305 | ret = usb_ep_queue(hidg->out_ep, req, GFP_KERNEL); | |
aa65d11a KO |
306 | if (ret < 0) { |
307 | free_ep_req(hidg->out_ep, req); | |
99c51500 | 308 | return ret; |
aa65d11a KO |
309 | } |
310 | } else { | |
33e4c1a9 | 311 | spin_lock_irqsave(&hidg->read_spinlock, flags); |
aa65d11a | 312 | list_add(&list->list, &hidg->completed_out_req); |
33e4c1a9 | 313 | spin_unlock_irqrestore(&hidg->read_spinlock, flags); |
aa65d11a KO |
314 | |
315 | wake_up(&hidg->read_queue); | |
99c51500 | 316 | } |
71adf118 FC |
317 | |
318 | return count; | |
319 | } | |
320 | ||
321 | static void f_hidg_req_complete(struct usb_ep *ep, struct usb_request *req) | |
322 | { | |
323 | struct f_hidg *hidg = (struct f_hidg *)ep->driver_data; | |
33e4c1a9 | 324 | unsigned long flags; |
71adf118 FC |
325 | |
326 | if (req->status != 0) { | |
327 | ERROR(hidg->func.config->cdev, | |
328 | "End Point Request ERROR: %d\n", req->status); | |
329 | } | |
330 | ||
33e4c1a9 | 331 | spin_lock_irqsave(&hidg->write_spinlock, flags); |
71adf118 | 332 | hidg->write_pending = 0; |
33e4c1a9 | 333 | spin_unlock_irqrestore(&hidg->write_spinlock, flags); |
71adf118 FC |
334 | wake_up(&hidg->write_queue); |
335 | } | |
336 | ||
337 | static ssize_t f_hidg_write(struct file *file, const char __user *buffer, | |
338 | size_t count, loff_t *offp) | |
339 | { | |
fd63b10b | 340 | struct f_hidg *hidg = file->private_data; |
749494b6 | 341 | struct usb_request *req; |
33e4c1a9 | 342 | unsigned long flags; |
71adf118 FC |
343 | ssize_t status = -ENOMEM; |
344 | ||
345 | if (!access_ok(VERIFY_READ, buffer, count)) | |
346 | return -EFAULT; | |
347 | ||
33e4c1a9 | 348 | spin_lock_irqsave(&hidg->write_spinlock, flags); |
71adf118 FC |
349 | |
350 | #define WRITE_COND (!hidg->write_pending) | |
749494b6 | 351 | try_again: |
71adf118 FC |
352 | /* write queue */ |
353 | while (!WRITE_COND) { | |
33e4c1a9 | 354 | spin_unlock_irqrestore(&hidg->write_spinlock, flags); |
71adf118 FC |
355 | if (file->f_flags & O_NONBLOCK) |
356 | return -EAGAIN; | |
357 | ||
358 | if (wait_event_interruptible_exclusive( | |
359 | hidg->write_queue, WRITE_COND)) | |
360 | return -ERESTARTSYS; | |
361 | ||
33e4c1a9 | 362 | spin_lock_irqsave(&hidg->write_spinlock, flags); |
71adf118 FC |
363 | } |
364 | ||
33e4c1a9 | 365 | hidg->write_pending = 1; |
749494b6 | 366 | req = hidg->req; |
71adf118 | 367 | count = min_t(unsigned, count, hidg->report_length); |
33e4c1a9 KO |
368 | |
369 | spin_unlock_irqrestore(&hidg->write_spinlock, flags); | |
25cd9721 | 370 | status = copy_from_user(req->buf, buffer, count); |
71adf118 FC |
371 | |
372 | if (status != 0) { | |
373 | ERROR(hidg->func.config->cdev, | |
374 | "copy_from_user error\n"); | |
33e4c1a9 KO |
375 | status = -EINVAL; |
376 | goto release_write_pending; | |
71adf118 FC |
377 | } |
378 | ||
749494b6 KO |
379 | spin_lock_irqsave(&hidg->write_spinlock, flags); |
380 | ||
25cd9721 | 381 | /* when our function has been disabled by host */ |
749494b6 | 382 | if (!hidg->req) { |
25cd9721 | 383 | free_ep_req(hidg->in_ep, req); |
749494b6 KO |
384 | /* |
385 | * TODO | |
386 | * Should we fail with error here? | |
387 | */ | |
388 | goto try_again; | |
389 | } | |
390 | ||
391 | req->status = 0; | |
392 | req->zero = 0; | |
393 | req->length = count; | |
394 | req->complete = f_hidg_req_complete; | |
395 | req->context = hidg; | |
71adf118 | 396 | |
25cd9721 | 397 | status = usb_ep_queue(hidg->in_ep, req, GFP_ATOMIC); |
71adf118 FC |
398 | if (status < 0) { |
399 | ERROR(hidg->func.config->cdev, | |
400 | "usb_ep_queue error on int endpoint %zd\n", status); | |
749494b6 | 401 | goto release_write_pending_unlocked; |
71adf118 FC |
402 | } else { |
403 | status = count; | |
404 | } | |
749494b6 | 405 | spin_unlock_irqrestore(&hidg->write_spinlock, flags); |
71adf118 | 406 | |
33e4c1a9 KO |
407 | return status; |
408 | release_write_pending: | |
409 | spin_lock_irqsave(&hidg->write_spinlock, flags); | |
749494b6 | 410 | release_write_pending_unlocked: |
33e4c1a9 KO |
411 | hidg->write_pending = 0; |
412 | spin_unlock_irqrestore(&hidg->write_spinlock, flags); | |
413 | ||
414 | wake_up(&hidg->write_queue); | |
71adf118 FC |
415 | |
416 | return status; | |
417 | } | |
418 | ||
419 | static unsigned int f_hidg_poll(struct file *file, poll_table *wait) | |
420 | { | |
fd63b10b | 421 | struct f_hidg *hidg = file->private_data; |
71adf118 FC |
422 | unsigned int ret = 0; |
423 | ||
424 | poll_wait(file, &hidg->read_queue, wait); | |
425 | poll_wait(file, &hidg->write_queue, wait); | |
426 | ||
427 | if (WRITE_COND) | |
428 | ret |= POLLOUT | POLLWRNORM; | |
429 | ||
430 | if (READ_COND) | |
431 | ret |= POLLIN | POLLRDNORM; | |
432 | ||
433 | return ret; | |
434 | } | |
435 | ||
436 | #undef WRITE_COND | |
437 | #undef READ_COND | |
438 | ||
439 | static int f_hidg_release(struct inode *inode, struct file *fd) | |
440 | { | |
441 | fd->private_data = NULL; | |
442 | return 0; | |
443 | } | |
444 | ||
445 | static int f_hidg_open(struct inode *inode, struct file *fd) | |
446 | { | |
447 | struct f_hidg *hidg = | |
448 | container_of(inode->i_cdev, struct f_hidg, cdev); | |
449 | ||
450 | fd->private_data = hidg; | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
455 | /*-------------------------------------------------------------------------*/ | |
456 | /* usb_function */ | |
457 | ||
1efd54ea AP |
458 | static inline struct usb_request *hidg_alloc_ep_req(struct usb_ep *ep, |
459 | unsigned length) | |
71adf118 | 460 | { |
aadbe812 | 461 | return alloc_ep_req(ep, length); |
99c51500 | 462 | } |
71adf118 | 463 | |
99c51500 DM |
464 | static void hidg_set_report_complete(struct usb_ep *ep, struct usb_request *req) |
465 | { | |
466 | struct f_hidg *hidg = (struct f_hidg *) req->context; | |
20d2ca95 | 467 | struct usb_composite_dev *cdev = hidg->func.config->cdev; |
99c51500 DM |
468 | struct f_hidg_req_list *req_list; |
469 | unsigned long flags; | |
71adf118 | 470 | |
20d2ca95 KO |
471 | switch (req->status) { |
472 | case 0: | |
473 | req_list = kzalloc(sizeof(*req_list), GFP_ATOMIC); | |
474 | if (!req_list) { | |
475 | ERROR(cdev, "Unable to allocate mem for req_list\n"); | |
476 | goto free_req; | |
477 | } | |
71adf118 | 478 | |
20d2ca95 | 479 | req_list->req = req; |
99c51500 | 480 | |
33e4c1a9 | 481 | spin_lock_irqsave(&hidg->read_spinlock, flags); |
20d2ca95 | 482 | list_add_tail(&req_list->list, &hidg->completed_out_req); |
33e4c1a9 | 483 | spin_unlock_irqrestore(&hidg->read_spinlock, flags); |
71adf118 | 484 | |
20d2ca95 KO |
485 | wake_up(&hidg->read_queue); |
486 | break; | |
487 | default: | |
488 | ERROR(cdev, "Set report failed %d\n", req->status); | |
489 | /* FALLTHROUGH */ | |
490 | case -ECONNABORTED: /* hardware forced ep reset */ | |
491 | case -ECONNRESET: /* request dequeued */ | |
492 | case -ESHUTDOWN: /* disconnect from host */ | |
493 | free_req: | |
494 | free_ep_req(ep, req); | |
495 | return; | |
496 | } | |
71adf118 FC |
497 | } |
498 | ||
499 | static int hidg_setup(struct usb_function *f, | |
500 | const struct usb_ctrlrequest *ctrl) | |
501 | { | |
502 | struct f_hidg *hidg = func_to_hidg(f); | |
503 | struct usb_composite_dev *cdev = f->config->cdev; | |
504 | struct usb_request *req = cdev->req; | |
505 | int status = 0; | |
506 | __u16 value, length; | |
507 | ||
508 | value = __le16_to_cpu(ctrl->wValue); | |
509 | length = __le16_to_cpu(ctrl->wLength); | |
510 | ||
c9b3bde0 JL |
511 | VDBG(cdev, |
512 | "%s crtl_request : bRequestType:0x%x bRequest:0x%x Value:0x%x\n", | |
513 | __func__, ctrl->bRequestType, ctrl->bRequest, value); | |
71adf118 FC |
514 | |
515 | switch ((ctrl->bRequestType << 8) | ctrl->bRequest) { | |
516 | case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
517 | | HID_REQ_GET_REPORT): | |
518 | VDBG(cdev, "get_report\n"); | |
519 | ||
520 | /* send an empty report */ | |
521 | length = min_t(unsigned, length, hidg->report_length); | |
522 | memset(req->buf, 0x0, length); | |
523 | ||
524 | goto respond; | |
525 | break; | |
526 | ||
527 | case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
528 | | HID_REQ_GET_PROTOCOL): | |
529 | VDBG(cdev, "get_protocol\n"); | |
530 | goto stall; | |
531 | break; | |
532 | ||
533 | case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
534 | | HID_REQ_SET_REPORT): | |
6774def6 | 535 | VDBG(cdev, "set_report | wLength=%d\n", ctrl->wLength); |
99c51500 | 536 | goto stall; |
71adf118 FC |
537 | break; |
538 | ||
539 | case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
540 | | HID_REQ_SET_PROTOCOL): | |
541 | VDBG(cdev, "set_protocol\n"); | |
542 | goto stall; | |
543 | break; | |
544 | ||
545 | case ((USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_INTERFACE) << 8 | |
546 | | USB_REQ_GET_DESCRIPTOR): | |
547 | switch (value >> 8) { | |
c240d78a | 548 | case HID_DT_HID: |
f286d487 KO |
549 | { |
550 | struct hid_descriptor hidg_desc_copy = hidg_desc; | |
551 | ||
c240d78a | 552 | VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: HID\n"); |
f286d487 KO |
553 | hidg_desc_copy.desc[0].bDescriptorType = HID_DT_REPORT; |
554 | hidg_desc_copy.desc[0].wDescriptorLength = | |
555 | cpu_to_le16(hidg->report_desc_length); | |
556 | ||
c240d78a | 557 | length = min_t(unsigned short, length, |
f286d487 KO |
558 | hidg_desc_copy.bLength); |
559 | memcpy(req->buf, &hidg_desc_copy, length); | |
c240d78a SB |
560 | goto respond; |
561 | break; | |
f286d487 | 562 | } |
71adf118 FC |
563 | case HID_DT_REPORT: |
564 | VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: REPORT\n"); | |
565 | length = min_t(unsigned short, length, | |
566 | hidg->report_desc_length); | |
567 | memcpy(req->buf, hidg->report_desc, length); | |
568 | goto respond; | |
569 | break; | |
570 | ||
571 | default: | |
1c1301dd | 572 | VDBG(cdev, "Unknown descriptor request 0x%x\n", |
71adf118 FC |
573 | value >> 8); |
574 | goto stall; | |
575 | break; | |
576 | } | |
577 | break; | |
578 | ||
579 | default: | |
580 | VDBG(cdev, "Unknown request 0x%x\n", | |
581 | ctrl->bRequest); | |
582 | goto stall; | |
583 | break; | |
584 | } | |
585 | ||
586 | stall: | |
587 | return -EOPNOTSUPP; | |
588 | ||
589 | respond: | |
590 | req->zero = 0; | |
591 | req->length = length; | |
592 | status = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); | |
593 | if (status < 0) | |
594 | ERROR(cdev, "usb_ep_queue error on ep0 %d\n", value); | |
595 | return status; | |
596 | } | |
597 | ||
598 | static void hidg_disable(struct usb_function *f) | |
599 | { | |
600 | struct f_hidg *hidg = func_to_hidg(f); | |
99c51500 | 601 | struct f_hidg_req_list *list, *next; |
aa65d11a | 602 | unsigned long flags; |
71adf118 FC |
603 | |
604 | usb_ep_disable(hidg->in_ep); | |
99c51500 | 605 | usb_ep_disable(hidg->out_ep); |
99c51500 | 606 | |
33e4c1a9 | 607 | spin_lock_irqsave(&hidg->read_spinlock, flags); |
99c51500 | 608 | list_for_each_entry_safe(list, next, &hidg->completed_out_req, list) { |
aa65d11a | 609 | free_ep_req(hidg->out_ep, list->req); |
99c51500 DM |
610 | list_del(&list->list); |
611 | kfree(list); | |
612 | } | |
33e4c1a9 | 613 | spin_unlock_irqrestore(&hidg->read_spinlock, flags); |
749494b6 KO |
614 | |
615 | spin_lock_irqsave(&hidg->write_spinlock, flags); | |
616 | if (!hidg->write_pending) { | |
617 | free_ep_req(hidg->in_ep, hidg->req); | |
618 | hidg->write_pending = 1; | |
619 | } | |
620 | ||
621 | hidg->req = NULL; | |
622 | spin_unlock_irqrestore(&hidg->write_spinlock, flags); | |
71adf118 FC |
623 | } |
624 | ||
625 | static int hidg_set_alt(struct usb_function *f, unsigned intf, unsigned alt) | |
626 | { | |
627 | struct usb_composite_dev *cdev = f->config->cdev; | |
628 | struct f_hidg *hidg = func_to_hidg(f); | |
749494b6 KO |
629 | struct usb_request *req_in = NULL; |
630 | unsigned long flags; | |
99c51500 | 631 | int i, status = 0; |
71adf118 FC |
632 | |
633 | VDBG(cdev, "hidg_set_alt intf:%d alt:%d\n", intf, alt); | |
634 | ||
635 | if (hidg->in_ep != NULL) { | |
636 | /* restart endpoint */ | |
2516a680 | 637 | usb_ep_disable(hidg->in_ep); |
71adf118 | 638 | |
ea2a1df7 TB |
639 | status = config_ep_by_speed(f->config->cdev->gadget, f, |
640 | hidg->in_ep); | |
641 | if (status) { | |
642 | ERROR(cdev, "config_ep_by_speed FAILED!\n"); | |
643 | goto fail; | |
644 | } | |
72c973dd | 645 | status = usb_ep_enable(hidg->in_ep); |
71adf118 | 646 | if (status < 0) { |
99c51500 | 647 | ERROR(cdev, "Enable IN endpoint FAILED!\n"); |
71adf118 FC |
648 | goto fail; |
649 | } | |
650 | hidg->in_ep->driver_data = hidg; | |
749494b6 KO |
651 | |
652 | req_in = hidg_alloc_ep_req(hidg->in_ep, hidg->report_length); | |
653 | if (!req_in) { | |
654 | status = -ENOMEM; | |
655 | goto disable_ep_in; | |
656 | } | |
71adf118 | 657 | } |
99c51500 DM |
658 | |
659 | ||
660 | if (hidg->out_ep != NULL) { | |
661 | /* restart endpoint */ | |
2516a680 | 662 | usb_ep_disable(hidg->out_ep); |
99c51500 DM |
663 | |
664 | status = config_ep_by_speed(f->config->cdev->gadget, f, | |
665 | hidg->out_ep); | |
666 | if (status) { | |
667 | ERROR(cdev, "config_ep_by_speed FAILED!\n"); | |
749494b6 | 668 | goto free_req_in; |
99c51500 DM |
669 | } |
670 | status = usb_ep_enable(hidg->out_ep); | |
671 | if (status < 0) { | |
43aef5c2 | 672 | ERROR(cdev, "Enable OUT endpoint FAILED!\n"); |
749494b6 | 673 | goto free_req_in; |
99c51500 DM |
674 | } |
675 | hidg->out_ep->driver_data = hidg; | |
676 | ||
677 | /* | |
678 | * allocate a bunch of read buffers and queue them all at once. | |
679 | */ | |
680 | for (i = 0; i < hidg->qlen && status == 0; i++) { | |
681 | struct usb_request *req = | |
682 | hidg_alloc_ep_req(hidg->out_ep, | |
683 | hidg->report_length); | |
684 | if (req) { | |
685 | req->complete = hidg_set_report_complete; | |
686 | req->context = hidg; | |
687 | status = usb_ep_queue(hidg->out_ep, req, | |
688 | GFP_ATOMIC); | |
749494b6 | 689 | if (status) { |
99c51500 DM |
690 | ERROR(cdev, "%s queue req --> %d\n", |
691 | hidg->out_ep->name, status); | |
749494b6 KO |
692 | free_ep_req(hidg->out_ep, req); |
693 | } | |
99c51500 | 694 | } else { |
99c51500 | 695 | status = -ENOMEM; |
749494b6 | 696 | goto disable_out_ep; |
99c51500 DM |
697 | } |
698 | } | |
699 | } | |
700 | ||
749494b6 KO |
701 | if (hidg->in_ep != NULL) { |
702 | spin_lock_irqsave(&hidg->write_spinlock, flags); | |
703 | hidg->req = req_in; | |
704 | hidg->write_pending = 0; | |
705 | spin_unlock_irqrestore(&hidg->write_spinlock, flags); | |
706 | ||
707 | wake_up(&hidg->write_queue); | |
708 | } | |
709 | return 0; | |
710 | disable_out_ep: | |
711 | usb_ep_disable(hidg->out_ep); | |
712 | free_req_in: | |
713 | if (req_in) | |
714 | free_ep_req(hidg->in_ep, req_in); | |
715 | ||
716 | disable_ep_in: | |
717 | if (hidg->in_ep) | |
718 | usb_ep_disable(hidg->in_ep); | |
719 | ||
71adf118 FC |
720 | fail: |
721 | return status; | |
722 | } | |
723 | ||
7a3cc461 | 724 | static const struct file_operations f_hidg_fops = { |
71adf118 FC |
725 | .owner = THIS_MODULE, |
726 | .open = f_hidg_open, | |
727 | .release = f_hidg_release, | |
728 | .write = f_hidg_write, | |
729 | .read = f_hidg_read, | |
730 | .poll = f_hidg_poll, | |
6038f373 | 731 | .llseek = noop_llseek, |
71adf118 FC |
732 | }; |
733 | ||
cb382536 | 734 | static int hidg_bind(struct usb_configuration *c, struct usb_function *f) |
71adf118 FC |
735 | { |
736 | struct usb_ep *ep; | |
737 | struct f_hidg *hidg = func_to_hidg(f); | |
5ca8d3ec | 738 | struct usb_string *us; |
63406087 | 739 | struct device *device; |
71adf118 FC |
740 | int status; |
741 | dev_t dev; | |
742 | ||
cb382536 | 743 | /* maybe allocate device-global string IDs, and patch descriptors */ |
5ca8d3ec AP |
744 | us = usb_gstrings_attach(c->cdev, ct_func_strings, |
745 | ARRAY_SIZE(ct_func_string_defs)); | |
746 | if (IS_ERR(us)) | |
747 | return PTR_ERR(us); | |
748 | hidg_interface_desc.iInterface = us[CT_FUNC_HID_IDX].id; | |
cb382536 | 749 | |
71adf118 FC |
750 | /* allocate instance-specific interface IDs, and patch descriptors */ |
751 | status = usb_interface_id(c, f); | |
752 | if (status < 0) | |
753 | goto fail; | |
754 | hidg_interface_desc.bInterfaceNumber = status; | |
755 | ||
71adf118 FC |
756 | /* allocate instance-specific endpoints */ |
757 | status = -ENODEV; | |
758 | ep = usb_ep_autoconfig(c->cdev->gadget, &hidg_fs_in_ep_desc); | |
759 | if (!ep) | |
760 | goto fail; | |
71adf118 FC |
761 | hidg->in_ep = ep; |
762 | ||
99c51500 DM |
763 | ep = usb_ep_autoconfig(c->cdev->gadget, &hidg_fs_out_ep_desc); |
764 | if (!ep) | |
765 | goto fail; | |
99c51500 DM |
766 | hidg->out_ep = ep; |
767 | ||
71adf118 FC |
768 | /* set descriptor dynamic values */ |
769 | hidg_interface_desc.bInterfaceSubClass = hidg->bInterfaceSubClass; | |
770 | hidg_interface_desc.bInterfaceProtocol = hidg->bInterfaceProtocol; | |
dbf499cf JD |
771 | hidg_ss_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); |
772 | hidg_ss_in_comp_desc.wBytesPerInterval = | |
773 | cpu_to_le16(hidg->report_length); | |
71adf118 FC |
774 | hidg_hs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); |
775 | hidg_fs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); | |
dbf499cf JD |
776 | hidg_ss_out_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); |
777 | hidg_ss_out_comp_desc.wBytesPerInterval = | |
778 | cpu_to_le16(hidg->report_length); | |
99c51500 DM |
779 | hidg_hs_out_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); |
780 | hidg_fs_out_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); | |
f286d487 KO |
781 | /* |
782 | * We can use hidg_desc struct here but we should not relay | |
783 | * that its content won't change after returning from this function. | |
784 | */ | |
71adf118 FC |
785 | hidg_desc.desc[0].bDescriptorType = HID_DT_REPORT; |
786 | hidg_desc.desc[0].wDescriptorLength = | |
787 | cpu_to_le16(hidg->report_desc_length); | |
788 | ||
10287bae SAS |
789 | hidg_hs_in_ep_desc.bEndpointAddress = |
790 | hidg_fs_in_ep_desc.bEndpointAddress; | |
791 | hidg_hs_out_ep_desc.bEndpointAddress = | |
792 | hidg_fs_out_ep_desc.bEndpointAddress; | |
71adf118 | 793 | |
dbf499cf JD |
794 | hidg_ss_in_ep_desc.bEndpointAddress = |
795 | hidg_fs_in_ep_desc.bEndpointAddress; | |
796 | hidg_ss_out_ep_desc.bEndpointAddress = | |
797 | hidg_fs_out_ep_desc.bEndpointAddress; | |
798 | ||
10287bae | 799 | status = usb_assign_descriptors(f, hidg_fs_descriptors, |
dbf499cf | 800 | hidg_hs_descriptors, hidg_ss_descriptors, NULL); |
10287bae SAS |
801 | if (status) |
802 | goto fail; | |
71adf118 | 803 | |
33e4c1a9 | 804 | spin_lock_init(&hidg->write_spinlock); |
749494b6 KO |
805 | hidg->write_pending = 1; |
806 | hidg->req = NULL; | |
33e4c1a9 | 807 | spin_lock_init(&hidg->read_spinlock); |
71adf118 FC |
808 | init_waitqueue_head(&hidg->write_queue); |
809 | init_waitqueue_head(&hidg->read_queue); | |
99c51500 | 810 | INIT_LIST_HEAD(&hidg->completed_out_req); |
71adf118 FC |
811 | |
812 | /* create char device */ | |
813 | cdev_init(&hidg->cdev, &f_hidg_fops); | |
814 | dev = MKDEV(major, hidg->minor); | |
815 | status = cdev_add(&hidg->cdev, dev, 1); | |
816 | if (status) | |
d12a8727 | 817 | goto fail_free_descs; |
71adf118 | 818 | |
63406087 AP |
819 | device = device_create(hidg_class, NULL, dev, NULL, |
820 | "%s%d", "hidg", hidg->minor); | |
821 | if (IS_ERR(device)) { | |
822 | status = PTR_ERR(device); | |
823 | goto del; | |
824 | } | |
71adf118 FC |
825 | |
826 | return 0; | |
63406087 AP |
827 | del: |
828 | cdev_del(&hidg->cdev); | |
d12a8727 PM |
829 | fail_free_descs: |
830 | usb_free_all_descriptors(f); | |
71adf118 FC |
831 | fail: |
832 | ERROR(f->config->cdev, "hidg_bind FAILED\n"); | |
14794d71 FT |
833 | if (hidg->req != NULL) |
834 | free_ep_req(hidg->in_ep, hidg->req); | |
71adf118 | 835 | |
71adf118 FC |
836 | return status; |
837 | } | |
838 | ||
cb382536 | 839 | static inline int hidg_get_minor(void) |
71adf118 | 840 | { |
cb382536 | 841 | int ret; |
71adf118 | 842 | |
cb382536 | 843 | ret = ida_simple_get(&hidg_ida, 0, 0, GFP_KERNEL); |
774cf72f AP |
844 | if (ret >= HIDG_MINORS) { |
845 | ida_simple_remove(&hidg_ida, ret); | |
846 | ret = -ENODEV; | |
847 | } | |
71adf118 | 848 | |
cb382536 AP |
849 | return ret; |
850 | } | |
71adf118 | 851 | |
21a9476a AP |
852 | static inline struct f_hid_opts *to_f_hid_opts(struct config_item *item) |
853 | { | |
854 | return container_of(to_config_group(item), struct f_hid_opts, | |
855 | func_inst.group); | |
71adf118 FC |
856 | } |
857 | ||
21a9476a AP |
858 | static void hid_attr_release(struct config_item *item) |
859 | { | |
860 | struct f_hid_opts *opts = to_f_hid_opts(item); | |
71adf118 | 861 | |
21a9476a AP |
862 | usb_put_function_instance(&opts->func_inst); |
863 | } | |
71adf118 | 864 | |
21a9476a AP |
865 | static struct configfs_item_operations hidg_item_ops = { |
866 | .release = hid_attr_release, | |
71adf118 FC |
867 | }; |
868 | ||
21a9476a | 869 | #define F_HID_OPT(name, prec, limit) \ |
da4e527c | 870 | static ssize_t f_hid_opts_##name##_show(struct config_item *item, char *page)\ |
21a9476a | 871 | { \ |
da4e527c | 872 | struct f_hid_opts *opts = to_f_hid_opts(item); \ |
21a9476a AP |
873 | int result; \ |
874 | \ | |
875 | mutex_lock(&opts->lock); \ | |
876 | result = sprintf(page, "%d\n", opts->name); \ | |
877 | mutex_unlock(&opts->lock); \ | |
878 | \ | |
879 | return result; \ | |
880 | } \ | |
881 | \ | |
da4e527c | 882 | static ssize_t f_hid_opts_##name##_store(struct config_item *item, \ |
21a9476a AP |
883 | const char *page, size_t len) \ |
884 | { \ | |
da4e527c | 885 | struct f_hid_opts *opts = to_f_hid_opts(item); \ |
21a9476a AP |
886 | int ret; \ |
887 | u##prec num; \ | |
888 | \ | |
889 | mutex_lock(&opts->lock); \ | |
890 | if (opts->refcnt) { \ | |
891 | ret = -EBUSY; \ | |
892 | goto end; \ | |
893 | } \ | |
894 | \ | |
895 | ret = kstrtou##prec(page, 0, &num); \ | |
896 | if (ret) \ | |
897 | goto end; \ | |
898 | \ | |
899 | if (num > limit) { \ | |
900 | ret = -EINVAL; \ | |
901 | goto end; \ | |
902 | } \ | |
903 | opts->name = num; \ | |
904 | ret = len; \ | |
905 | \ | |
906 | end: \ | |
907 | mutex_unlock(&opts->lock); \ | |
908 | return ret; \ | |
909 | } \ | |
910 | \ | |
da4e527c | 911 | CONFIGFS_ATTR(f_hid_opts_, name) |
21a9476a AP |
912 | |
913 | F_HID_OPT(subclass, 8, 255); | |
914 | F_HID_OPT(protocol, 8, 255); | |
39a2ac27 | 915 | F_HID_OPT(report_length, 16, 65535); |
21a9476a | 916 | |
da4e527c | 917 | static ssize_t f_hid_opts_report_desc_show(struct config_item *item, char *page) |
21a9476a | 918 | { |
da4e527c | 919 | struct f_hid_opts *opts = to_f_hid_opts(item); |
21a9476a AP |
920 | int result; |
921 | ||
922 | mutex_lock(&opts->lock); | |
923 | result = opts->report_desc_length; | |
924 | memcpy(page, opts->report_desc, opts->report_desc_length); | |
925 | mutex_unlock(&opts->lock); | |
926 | ||
927 | return result; | |
928 | } | |
929 | ||
da4e527c | 930 | static ssize_t f_hid_opts_report_desc_store(struct config_item *item, |
21a9476a AP |
931 | const char *page, size_t len) |
932 | { | |
da4e527c | 933 | struct f_hid_opts *opts = to_f_hid_opts(item); |
21a9476a AP |
934 | int ret = -EBUSY; |
935 | char *d; | |
936 | ||
937 | mutex_lock(&opts->lock); | |
938 | ||
939 | if (opts->refcnt) | |
940 | goto end; | |
941 | if (len > PAGE_SIZE) { | |
942 | ret = -ENOSPC; | |
943 | goto end; | |
944 | } | |
945 | d = kmemdup(page, len, GFP_KERNEL); | |
946 | if (!d) { | |
947 | ret = -ENOMEM; | |
948 | goto end; | |
949 | } | |
950 | kfree(opts->report_desc); | |
951 | opts->report_desc = d; | |
952 | opts->report_desc_length = len; | |
953 | opts->report_desc_alloc = true; | |
954 | ret = len; | |
955 | end: | |
956 | mutex_unlock(&opts->lock); | |
957 | return ret; | |
958 | } | |
959 | ||
da4e527c | 960 | CONFIGFS_ATTR(f_hid_opts_, report_desc); |
21a9476a | 961 | |
ed6fe1f5 JB |
962 | static ssize_t f_hid_opts_dev_show(struct config_item *item, char *page) |
963 | { | |
964 | struct f_hid_opts *opts = to_f_hid_opts(item); | |
965 | ||
966 | return sprintf(page, "%d:%d\n", major, opts->minor); | |
967 | } | |
968 | ||
969 | CONFIGFS_ATTR_RO(f_hid_opts_, dev); | |
970 | ||
21a9476a | 971 | static struct configfs_attribute *hid_attrs[] = { |
da4e527c CH |
972 | &f_hid_opts_attr_subclass, |
973 | &f_hid_opts_attr_protocol, | |
974 | &f_hid_opts_attr_report_length, | |
975 | &f_hid_opts_attr_report_desc, | |
ed6fe1f5 | 976 | &f_hid_opts_attr_dev, |
71adf118 FC |
977 | NULL, |
978 | }; | |
979 | ||
21a9476a AP |
980 | static struct config_item_type hid_func_type = { |
981 | .ct_item_ops = &hidg_item_ops, | |
982 | .ct_attrs = hid_attrs, | |
983 | .ct_owner = THIS_MODULE, | |
984 | }; | |
71adf118 | 985 | |
cb382536 | 986 | static inline void hidg_put_minor(int minor) |
71adf118 | 987 | { |
cb382536 AP |
988 | ida_simple_remove(&hidg_ida, minor); |
989 | } | |
71adf118 | 990 | |
cb382536 AP |
991 | static void hidg_free_inst(struct usb_function_instance *f) |
992 | { | |
993 | struct f_hid_opts *opts; | |
71adf118 | 994 | |
cb382536 AP |
995 | opts = container_of(f, struct f_hid_opts, func_inst); |
996 | ||
997 | mutex_lock(&hidg_ida_lock); | |
998 | ||
999 | hidg_put_minor(opts->minor); | |
99c49407 | 1000 | if (ida_is_empty(&hidg_ida)) |
cb382536 AP |
1001 | ghid_cleanup(); |
1002 | ||
1003 | mutex_unlock(&hidg_ida_lock); | |
1004 | ||
1005 | if (opts->report_desc_alloc) | |
1006 | kfree(opts->report_desc); | |
1007 | ||
1008 | kfree(opts); | |
1009 | } | |
1010 | ||
1011 | static struct usb_function_instance *hidg_alloc_inst(void) | |
1012 | { | |
1013 | struct f_hid_opts *opts; | |
1014 | struct usb_function_instance *ret; | |
1015 | int status = 0; | |
1016 | ||
1017 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
1018 | if (!opts) | |
1019 | return ERR_PTR(-ENOMEM); | |
21a9476a | 1020 | mutex_init(&opts->lock); |
cb382536 AP |
1021 | opts->func_inst.free_func_inst = hidg_free_inst; |
1022 | ret = &opts->func_inst; | |
1023 | ||
1024 | mutex_lock(&hidg_ida_lock); | |
1025 | ||
99c49407 | 1026 | if (ida_is_empty(&hidg_ida)) { |
cb382536 AP |
1027 | status = ghid_setup(NULL, HIDG_MINORS); |
1028 | if (status) { | |
1029 | ret = ERR_PTR(status); | |
1030 | kfree(opts); | |
1031 | goto unlock; | |
1032 | } | |
1033 | } | |
1034 | ||
1035 | opts->minor = hidg_get_minor(); | |
1036 | if (opts->minor < 0) { | |
1037 | ret = ERR_PTR(opts->minor); | |
1038 | kfree(opts); | |
99c49407 | 1039 | if (ida_is_empty(&hidg_ida)) |
cb382536 | 1040 | ghid_cleanup(); |
828f6148 | 1041 | goto unlock; |
71adf118 | 1042 | } |
21a9476a | 1043 | config_group_init_type_name(&opts->func_inst.group, "", &hid_func_type); |
cb382536 AP |
1044 | |
1045 | unlock: | |
1046 | mutex_unlock(&hidg_ida_lock); | |
1047 | return ret; | |
1048 | } | |
1049 | ||
1050 | static void hidg_free(struct usb_function *f) | |
1051 | { | |
1052 | struct f_hidg *hidg; | |
21a9476a | 1053 | struct f_hid_opts *opts; |
cb382536 AP |
1054 | |
1055 | hidg = func_to_hidg(f); | |
21a9476a | 1056 | opts = container_of(f->fi, struct f_hid_opts, func_inst); |
cb382536 AP |
1057 | kfree(hidg->report_desc); |
1058 | kfree(hidg); | |
21a9476a AP |
1059 | mutex_lock(&opts->lock); |
1060 | --opts->refcnt; | |
1061 | mutex_unlock(&opts->lock); | |
cb382536 AP |
1062 | } |
1063 | ||
1064 | static void hidg_unbind(struct usb_configuration *c, struct usb_function *f) | |
1065 | { | |
1066 | struct f_hidg *hidg = func_to_hidg(f); | |
1067 | ||
1068 | device_destroy(hidg_class, MKDEV(major, hidg->minor)); | |
1069 | cdev_del(&hidg->cdev); | |
1070 | ||
cb382536 AP |
1071 | usb_free_all_descriptors(f); |
1072 | } | |
1073 | ||
0fc57ea0 | 1074 | static struct usb_function *hidg_alloc(struct usb_function_instance *fi) |
cb382536 AP |
1075 | { |
1076 | struct f_hidg *hidg; | |
1077 | struct f_hid_opts *opts; | |
71adf118 FC |
1078 | |
1079 | /* allocate and initialize one new instance */ | |
cb382536 | 1080 | hidg = kzalloc(sizeof(*hidg), GFP_KERNEL); |
71adf118 | 1081 | if (!hidg) |
cb382536 AP |
1082 | return ERR_PTR(-ENOMEM); |
1083 | ||
1084 | opts = container_of(fi, struct f_hid_opts, func_inst); | |
1085 | ||
21a9476a AP |
1086 | mutex_lock(&opts->lock); |
1087 | ++opts->refcnt; | |
1088 | ||
cb382536 AP |
1089 | hidg->minor = opts->minor; |
1090 | hidg->bInterfaceSubClass = opts->subclass; | |
1091 | hidg->bInterfaceProtocol = opts->protocol; | |
1092 | hidg->report_length = opts->report_length; | |
1093 | hidg->report_desc_length = opts->report_desc_length; | |
1094 | if (opts->report_desc) { | |
1095 | hidg->report_desc = kmemdup(opts->report_desc, | |
1096 | opts->report_desc_length, | |
1097 | GFP_KERNEL); | |
1098 | if (!hidg->report_desc) { | |
1099 | kfree(hidg); | |
21a9476a | 1100 | mutex_unlock(&opts->lock); |
cb382536 AP |
1101 | return ERR_PTR(-ENOMEM); |
1102 | } | |
71adf118 FC |
1103 | } |
1104 | ||
21a9476a AP |
1105 | mutex_unlock(&opts->lock); |
1106 | ||
71adf118 | 1107 | hidg->func.name = "hid"; |
71adf118 FC |
1108 | hidg->func.bind = hidg_bind; |
1109 | hidg->func.unbind = hidg_unbind; | |
1110 | hidg->func.set_alt = hidg_set_alt; | |
1111 | hidg->func.disable = hidg_disable; | |
1112 | hidg->func.setup = hidg_setup; | |
cb382536 | 1113 | hidg->func.free_func = hidg_free; |
71adf118 | 1114 | |
99c51500 DM |
1115 | /* this could me made configurable at some point */ |
1116 | hidg->qlen = 4; | |
1117 | ||
cb382536 | 1118 | return &hidg->func; |
71adf118 FC |
1119 | } |
1120 | ||
cb382536 AP |
1121 | DECLARE_USB_FUNCTION_INIT(hid, hidg_alloc_inst, hidg_alloc); |
1122 | MODULE_LICENSE("GPL"); | |
1123 | MODULE_AUTHOR("Fabien Chouteau"); | |
1124 | ||
cb382536 | 1125 | int ghid_setup(struct usb_gadget *g, int count) |
71adf118 FC |
1126 | { |
1127 | int status; | |
1128 | dev_t dev; | |
1129 | ||
1130 | hidg_class = class_create(THIS_MODULE, "hidg"); | |
06529407 | 1131 | if (IS_ERR(hidg_class)) { |
0448d38c | 1132 | status = PTR_ERR(hidg_class); |
06529407 | 1133 | hidg_class = NULL; |
0448d38c | 1134 | return status; |
06529407 | 1135 | } |
71adf118 FC |
1136 | |
1137 | status = alloc_chrdev_region(&dev, 0, count, "hidg"); | |
0448d38c DC |
1138 | if (status) { |
1139 | class_destroy(hidg_class); | |
1140 | hidg_class = NULL; | |
1141 | return status; | |
71adf118 FC |
1142 | } |
1143 | ||
0448d38c DC |
1144 | major = MAJOR(dev); |
1145 | minors = count; | |
1146 | ||
1147 | return 0; | |
71adf118 FC |
1148 | } |
1149 | ||
1150 | void ghid_cleanup(void) | |
1151 | { | |
1152 | if (major) { | |
1153 | unregister_chrdev_region(MKDEV(major, 0), minors); | |
1154 | major = minors = 0; | |
1155 | } | |
1156 | ||
1157 | class_destroy(hidg_class); | |
1158 | hidg_class = NULL; | |
1159 | } |