Commit | Line | Data |
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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. | |
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 | ||
101 | /* High-Speed Support */ | |
102 | ||
103 | static struct usb_endpoint_descriptor hidg_hs_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 | ||
99c51500 DM |
115 | static struct usb_endpoint_descriptor hidg_hs_out_ep_desc = { |
116 | .bLength = USB_DT_ENDPOINT_SIZE, | |
117 | .bDescriptorType = USB_DT_ENDPOINT, | |
118 | .bEndpointAddress = USB_DIR_OUT, | |
119 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
120 | /*.wMaxPacketSize = DYNAMIC */ | |
121 | .bInterval = 4, /* FIXME: Add this field in the | |
122 | * HID gadget configuration? | |
123 | * (struct hidg_func_descriptor) | |
124 | */ | |
125 | }; | |
126 | ||
71adf118 FC |
127 | static struct usb_descriptor_header *hidg_hs_descriptors[] = { |
128 | (struct usb_descriptor_header *)&hidg_interface_desc, | |
129 | (struct usb_descriptor_header *)&hidg_desc, | |
130 | (struct usb_descriptor_header *)&hidg_hs_in_ep_desc, | |
99c51500 | 131 | (struct usb_descriptor_header *)&hidg_hs_out_ep_desc, |
71adf118 FC |
132 | NULL, |
133 | }; | |
134 | ||
135 | /* Full-Speed Support */ | |
136 | ||
137 | static struct usb_endpoint_descriptor hidg_fs_in_ep_desc = { | |
138 | .bLength = USB_DT_ENDPOINT_SIZE, | |
139 | .bDescriptorType = USB_DT_ENDPOINT, | |
140 | .bEndpointAddress = USB_DIR_IN, | |
141 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
142 | /*.wMaxPacketSize = DYNAMIC */ | |
143 | .bInterval = 10, /* FIXME: Add this field in the | |
144 | * HID gadget configuration? | |
145 | * (struct hidg_func_descriptor) | |
146 | */ | |
147 | }; | |
148 | ||
99c51500 DM |
149 | static struct usb_endpoint_descriptor hidg_fs_out_ep_desc = { |
150 | .bLength = USB_DT_ENDPOINT_SIZE, | |
151 | .bDescriptorType = USB_DT_ENDPOINT, | |
152 | .bEndpointAddress = USB_DIR_OUT, | |
153 | .bmAttributes = USB_ENDPOINT_XFER_INT, | |
154 | /*.wMaxPacketSize = DYNAMIC */ | |
155 | .bInterval = 10, /* FIXME: Add this field in the | |
156 | * HID gadget configuration? | |
157 | * (struct hidg_func_descriptor) | |
158 | */ | |
159 | }; | |
160 | ||
71adf118 FC |
161 | static struct usb_descriptor_header *hidg_fs_descriptors[] = { |
162 | (struct usb_descriptor_header *)&hidg_interface_desc, | |
163 | (struct usb_descriptor_header *)&hidg_desc, | |
164 | (struct usb_descriptor_header *)&hidg_fs_in_ep_desc, | |
99c51500 | 165 | (struct usb_descriptor_header *)&hidg_fs_out_ep_desc, |
71adf118 FC |
166 | NULL, |
167 | }; | |
168 | ||
cb382536 AP |
169 | /*-------------------------------------------------------------------------*/ |
170 | /* Strings */ | |
171 | ||
172 | #define CT_FUNC_HID_IDX 0 | |
173 | ||
174 | static struct usb_string ct_func_string_defs[] = { | |
175 | [CT_FUNC_HID_IDX].s = "HID Interface", | |
176 | {}, /* end of list */ | |
177 | }; | |
178 | ||
179 | static struct usb_gadget_strings ct_func_string_table = { | |
180 | .language = 0x0409, /* en-US */ | |
181 | .strings = ct_func_string_defs, | |
182 | }; | |
183 | ||
184 | static struct usb_gadget_strings *ct_func_strings[] = { | |
185 | &ct_func_string_table, | |
186 | NULL, | |
187 | }; | |
188 | ||
71adf118 FC |
189 | /*-------------------------------------------------------------------------*/ |
190 | /* Char Device */ | |
191 | ||
192 | static ssize_t f_hidg_read(struct file *file, char __user *buffer, | |
193 | size_t count, loff_t *ptr) | |
194 | { | |
99c51500 DM |
195 | struct f_hidg *hidg = file->private_data; |
196 | struct f_hidg_req_list *list; | |
197 | struct usb_request *req; | |
198 | unsigned long flags; | |
199 | int ret; | |
71adf118 FC |
200 | |
201 | if (!count) | |
202 | return 0; | |
203 | ||
204 | if (!access_ok(VERIFY_WRITE, buffer, count)) | |
205 | return -EFAULT; | |
206 | ||
207 | spin_lock_irqsave(&hidg->spinlock, flags); | |
208 | ||
99c51500 | 209 | #define READ_COND (!list_empty(&hidg->completed_out_req)) |
71adf118 | 210 | |
99c51500 | 211 | /* wait for at least one buffer to complete */ |
71adf118 FC |
212 | while (!READ_COND) { |
213 | spin_unlock_irqrestore(&hidg->spinlock, flags); | |
214 | if (file->f_flags & O_NONBLOCK) | |
215 | return -EAGAIN; | |
216 | ||
217 | if (wait_event_interruptible(hidg->read_queue, READ_COND)) | |
218 | return -ERESTARTSYS; | |
219 | ||
220 | spin_lock_irqsave(&hidg->spinlock, flags); | |
221 | } | |
222 | ||
99c51500 DM |
223 | /* pick the first one */ |
224 | list = list_first_entry(&hidg->completed_out_req, | |
225 | struct f_hidg_req_list, list); | |
226 | req = list->req; | |
227 | count = min_t(unsigned int, count, req->actual - list->pos); | |
71adf118 FC |
228 | spin_unlock_irqrestore(&hidg->spinlock, flags); |
229 | ||
99c51500 DM |
230 | /* copy to user outside spinlock */ |
231 | count -= copy_to_user(buffer, req->buf + list->pos, count); | |
232 | list->pos += count; | |
233 | ||
234 | /* | |
235 | * if this request is completely handled and transfered to | |
236 | * userspace, remove its entry from the list and requeue it | |
237 | * again. Otherwise, we will revisit it again upon the next | |
238 | * call, taking into account its current read position. | |
239 | */ | |
240 | if (list->pos == req->actual) { | |
241 | spin_lock_irqsave(&hidg->spinlock, flags); | |
242 | list_del(&list->list); | |
243 | kfree(list); | |
244 | spin_unlock_irqrestore(&hidg->spinlock, flags); | |
245 | ||
246 | req->length = hidg->report_length; | |
247 | ret = usb_ep_queue(hidg->out_ep, req, GFP_KERNEL); | |
248 | if (ret < 0) | |
249 | return ret; | |
250 | } | |
71adf118 FC |
251 | |
252 | return count; | |
253 | } | |
254 | ||
255 | static void f_hidg_req_complete(struct usb_ep *ep, struct usb_request *req) | |
256 | { | |
257 | struct f_hidg *hidg = (struct f_hidg *)ep->driver_data; | |
258 | ||
259 | if (req->status != 0) { | |
260 | ERROR(hidg->func.config->cdev, | |
261 | "End Point Request ERROR: %d\n", req->status); | |
262 | } | |
263 | ||
264 | hidg->write_pending = 0; | |
265 | wake_up(&hidg->write_queue); | |
266 | } | |
267 | ||
268 | static ssize_t f_hidg_write(struct file *file, const char __user *buffer, | |
269 | size_t count, loff_t *offp) | |
270 | { | |
fd63b10b | 271 | struct f_hidg *hidg = file->private_data; |
71adf118 FC |
272 | ssize_t status = -ENOMEM; |
273 | ||
274 | if (!access_ok(VERIFY_READ, buffer, count)) | |
275 | return -EFAULT; | |
276 | ||
277 | mutex_lock(&hidg->lock); | |
278 | ||
279 | #define WRITE_COND (!hidg->write_pending) | |
280 | ||
281 | /* write queue */ | |
282 | while (!WRITE_COND) { | |
283 | mutex_unlock(&hidg->lock); | |
284 | if (file->f_flags & O_NONBLOCK) | |
285 | return -EAGAIN; | |
286 | ||
287 | if (wait_event_interruptible_exclusive( | |
288 | hidg->write_queue, WRITE_COND)) | |
289 | return -ERESTARTSYS; | |
290 | ||
291 | mutex_lock(&hidg->lock); | |
292 | } | |
293 | ||
294 | count = min_t(unsigned, count, hidg->report_length); | |
295 | status = copy_from_user(hidg->req->buf, buffer, count); | |
296 | ||
297 | if (status != 0) { | |
298 | ERROR(hidg->func.config->cdev, | |
299 | "copy_from_user error\n"); | |
300 | mutex_unlock(&hidg->lock); | |
301 | return -EINVAL; | |
302 | } | |
303 | ||
304 | hidg->req->status = 0; | |
305 | hidg->req->zero = 0; | |
306 | hidg->req->length = count; | |
307 | hidg->req->complete = f_hidg_req_complete; | |
308 | hidg->req->context = hidg; | |
309 | hidg->write_pending = 1; | |
310 | ||
311 | status = usb_ep_queue(hidg->in_ep, hidg->req, GFP_ATOMIC); | |
312 | if (status < 0) { | |
313 | ERROR(hidg->func.config->cdev, | |
314 | "usb_ep_queue error on int endpoint %zd\n", status); | |
315 | hidg->write_pending = 0; | |
316 | wake_up(&hidg->write_queue); | |
317 | } else { | |
318 | status = count; | |
319 | } | |
320 | ||
321 | mutex_unlock(&hidg->lock); | |
322 | ||
323 | return status; | |
324 | } | |
325 | ||
326 | static unsigned int f_hidg_poll(struct file *file, poll_table *wait) | |
327 | { | |
fd63b10b | 328 | struct f_hidg *hidg = file->private_data; |
71adf118 FC |
329 | unsigned int ret = 0; |
330 | ||
331 | poll_wait(file, &hidg->read_queue, wait); | |
332 | poll_wait(file, &hidg->write_queue, wait); | |
333 | ||
334 | if (WRITE_COND) | |
335 | ret |= POLLOUT | POLLWRNORM; | |
336 | ||
337 | if (READ_COND) | |
338 | ret |= POLLIN | POLLRDNORM; | |
339 | ||
340 | return ret; | |
341 | } | |
342 | ||
343 | #undef WRITE_COND | |
344 | #undef READ_COND | |
345 | ||
346 | static int f_hidg_release(struct inode *inode, struct file *fd) | |
347 | { | |
348 | fd->private_data = NULL; | |
349 | return 0; | |
350 | } | |
351 | ||
352 | static int f_hidg_open(struct inode *inode, struct file *fd) | |
353 | { | |
354 | struct f_hidg *hidg = | |
355 | container_of(inode->i_cdev, struct f_hidg, cdev); | |
356 | ||
357 | fd->private_data = hidg; | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
362 | /*-------------------------------------------------------------------------*/ | |
363 | /* usb_function */ | |
364 | ||
1efd54ea AP |
365 | static inline struct usb_request *hidg_alloc_ep_req(struct usb_ep *ep, |
366 | unsigned length) | |
71adf118 | 367 | { |
1efd54ea | 368 | return alloc_ep_req(ep, length, length); |
99c51500 | 369 | } |
71adf118 | 370 | |
99c51500 DM |
371 | static void hidg_set_report_complete(struct usb_ep *ep, struct usb_request *req) |
372 | { | |
373 | struct f_hidg *hidg = (struct f_hidg *) req->context; | |
374 | struct f_hidg_req_list *req_list; | |
375 | unsigned long flags; | |
71adf118 | 376 | |
99c51500 DM |
377 | req_list = kzalloc(sizeof(*req_list), GFP_ATOMIC); |
378 | if (!req_list) | |
71adf118 | 379 | return; |
71adf118 | 380 | |
99c51500 DM |
381 | req_list->req = req; |
382 | ||
383 | spin_lock_irqsave(&hidg->spinlock, flags); | |
384 | list_add_tail(&req_list->list, &hidg->completed_out_req); | |
385 | spin_unlock_irqrestore(&hidg->spinlock, flags); | |
71adf118 FC |
386 | |
387 | wake_up(&hidg->read_queue); | |
71adf118 FC |
388 | } |
389 | ||
390 | static int hidg_setup(struct usb_function *f, | |
391 | const struct usb_ctrlrequest *ctrl) | |
392 | { | |
393 | struct f_hidg *hidg = func_to_hidg(f); | |
394 | struct usb_composite_dev *cdev = f->config->cdev; | |
395 | struct usb_request *req = cdev->req; | |
396 | int status = 0; | |
397 | __u16 value, length; | |
398 | ||
399 | value = __le16_to_cpu(ctrl->wValue); | |
400 | length = __le16_to_cpu(ctrl->wLength); | |
401 | ||
402 | VDBG(cdev, "hid_setup crtl_request : bRequestType:0x%x bRequest:0x%x " | |
403 | "Value:0x%x\n", ctrl->bRequestType, ctrl->bRequest, value); | |
404 | ||
405 | switch ((ctrl->bRequestType << 8) | ctrl->bRequest) { | |
406 | case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
407 | | HID_REQ_GET_REPORT): | |
408 | VDBG(cdev, "get_report\n"); | |
409 | ||
410 | /* send an empty report */ | |
411 | length = min_t(unsigned, length, hidg->report_length); | |
412 | memset(req->buf, 0x0, length); | |
413 | ||
414 | goto respond; | |
415 | break; | |
416 | ||
417 | case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
418 | | HID_REQ_GET_PROTOCOL): | |
419 | VDBG(cdev, "get_protocol\n"); | |
420 | goto stall; | |
421 | break; | |
422 | ||
423 | case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
424 | | HID_REQ_SET_REPORT): | |
425 | VDBG(cdev, "set_report | wLenght=%d\n", ctrl->wLength); | |
99c51500 | 426 | goto stall; |
71adf118 FC |
427 | break; |
428 | ||
429 | case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | |
430 | | HID_REQ_SET_PROTOCOL): | |
431 | VDBG(cdev, "set_protocol\n"); | |
432 | goto stall; | |
433 | break; | |
434 | ||
435 | case ((USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_INTERFACE) << 8 | |
436 | | USB_REQ_GET_DESCRIPTOR): | |
437 | switch (value >> 8) { | |
c240d78a SB |
438 | case HID_DT_HID: |
439 | VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: HID\n"); | |
440 | length = min_t(unsigned short, length, | |
441 | hidg_desc.bLength); | |
442 | memcpy(req->buf, &hidg_desc, length); | |
443 | goto respond; | |
444 | break; | |
71adf118 FC |
445 | case HID_DT_REPORT: |
446 | VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: REPORT\n"); | |
447 | length = min_t(unsigned short, length, | |
448 | hidg->report_desc_length); | |
449 | memcpy(req->buf, hidg->report_desc, length); | |
450 | goto respond; | |
451 | break; | |
452 | ||
453 | default: | |
1c1301dd | 454 | VDBG(cdev, "Unknown descriptor request 0x%x\n", |
71adf118 FC |
455 | value >> 8); |
456 | goto stall; | |
457 | break; | |
458 | } | |
459 | break; | |
460 | ||
461 | default: | |
462 | VDBG(cdev, "Unknown request 0x%x\n", | |
463 | ctrl->bRequest); | |
464 | goto stall; | |
465 | break; | |
466 | } | |
467 | ||
468 | stall: | |
469 | return -EOPNOTSUPP; | |
470 | ||
471 | respond: | |
472 | req->zero = 0; | |
473 | req->length = length; | |
474 | status = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); | |
475 | if (status < 0) | |
476 | ERROR(cdev, "usb_ep_queue error on ep0 %d\n", value); | |
477 | return status; | |
478 | } | |
479 | ||
480 | static void hidg_disable(struct usb_function *f) | |
481 | { | |
482 | struct f_hidg *hidg = func_to_hidg(f); | |
99c51500 | 483 | struct f_hidg_req_list *list, *next; |
71adf118 FC |
484 | |
485 | usb_ep_disable(hidg->in_ep); | |
486 | hidg->in_ep->driver_data = NULL; | |
99c51500 DM |
487 | |
488 | usb_ep_disable(hidg->out_ep); | |
489 | hidg->out_ep->driver_data = NULL; | |
490 | ||
491 | list_for_each_entry_safe(list, next, &hidg->completed_out_req, list) { | |
492 | list_del(&list->list); | |
493 | kfree(list); | |
494 | } | |
71adf118 FC |
495 | } |
496 | ||
497 | static int hidg_set_alt(struct usb_function *f, unsigned intf, unsigned alt) | |
498 | { | |
499 | struct usb_composite_dev *cdev = f->config->cdev; | |
500 | struct f_hidg *hidg = func_to_hidg(f); | |
99c51500 | 501 | int i, status = 0; |
71adf118 FC |
502 | |
503 | VDBG(cdev, "hidg_set_alt intf:%d alt:%d\n", intf, alt); | |
504 | ||
505 | if (hidg->in_ep != NULL) { | |
506 | /* restart endpoint */ | |
507 | if (hidg->in_ep->driver_data != NULL) | |
508 | usb_ep_disable(hidg->in_ep); | |
509 | ||
ea2a1df7 TB |
510 | status = config_ep_by_speed(f->config->cdev->gadget, f, |
511 | hidg->in_ep); | |
512 | if (status) { | |
513 | ERROR(cdev, "config_ep_by_speed FAILED!\n"); | |
514 | goto fail; | |
515 | } | |
72c973dd | 516 | status = usb_ep_enable(hidg->in_ep); |
71adf118 | 517 | if (status < 0) { |
99c51500 | 518 | ERROR(cdev, "Enable IN endpoint FAILED!\n"); |
71adf118 FC |
519 | goto fail; |
520 | } | |
521 | hidg->in_ep->driver_data = hidg; | |
522 | } | |
99c51500 DM |
523 | |
524 | ||
525 | if (hidg->out_ep != NULL) { | |
526 | /* restart endpoint */ | |
527 | if (hidg->out_ep->driver_data != NULL) | |
528 | usb_ep_disable(hidg->out_ep); | |
529 | ||
530 | status = config_ep_by_speed(f->config->cdev->gadget, f, | |
531 | hidg->out_ep); | |
532 | if (status) { | |
533 | ERROR(cdev, "config_ep_by_speed FAILED!\n"); | |
534 | goto fail; | |
535 | } | |
536 | status = usb_ep_enable(hidg->out_ep); | |
537 | if (status < 0) { | |
538 | ERROR(cdev, "Enable IN endpoint FAILED!\n"); | |
539 | goto fail; | |
540 | } | |
541 | hidg->out_ep->driver_data = hidg; | |
542 | ||
543 | /* | |
544 | * allocate a bunch of read buffers and queue them all at once. | |
545 | */ | |
546 | for (i = 0; i < hidg->qlen && status == 0; i++) { | |
547 | struct usb_request *req = | |
548 | hidg_alloc_ep_req(hidg->out_ep, | |
549 | hidg->report_length); | |
550 | if (req) { | |
551 | req->complete = hidg_set_report_complete; | |
552 | req->context = hidg; | |
553 | status = usb_ep_queue(hidg->out_ep, req, | |
554 | GFP_ATOMIC); | |
555 | if (status) | |
556 | ERROR(cdev, "%s queue req --> %d\n", | |
557 | hidg->out_ep->name, status); | |
558 | } else { | |
559 | usb_ep_disable(hidg->out_ep); | |
560 | hidg->out_ep->driver_data = NULL; | |
561 | status = -ENOMEM; | |
562 | goto fail; | |
563 | } | |
564 | } | |
565 | } | |
566 | ||
71adf118 FC |
567 | fail: |
568 | return status; | |
569 | } | |
570 | ||
571 | const struct file_operations f_hidg_fops = { | |
572 | .owner = THIS_MODULE, | |
573 | .open = f_hidg_open, | |
574 | .release = f_hidg_release, | |
575 | .write = f_hidg_write, | |
576 | .read = f_hidg_read, | |
577 | .poll = f_hidg_poll, | |
6038f373 | 578 | .llseek = noop_llseek, |
71adf118 FC |
579 | }; |
580 | ||
cb382536 | 581 | static int hidg_bind(struct usb_configuration *c, struct usb_function *f) |
71adf118 FC |
582 | { |
583 | struct usb_ep *ep; | |
584 | struct f_hidg *hidg = func_to_hidg(f); | |
5ca8d3ec | 585 | struct usb_string *us; |
63406087 | 586 | struct device *device; |
71adf118 FC |
587 | int status; |
588 | dev_t dev; | |
589 | ||
cb382536 | 590 | /* maybe allocate device-global string IDs, and patch descriptors */ |
5ca8d3ec AP |
591 | us = usb_gstrings_attach(c->cdev, ct_func_strings, |
592 | ARRAY_SIZE(ct_func_string_defs)); | |
593 | if (IS_ERR(us)) | |
594 | return PTR_ERR(us); | |
595 | hidg_interface_desc.iInterface = us[CT_FUNC_HID_IDX].id; | |
cb382536 | 596 | |
71adf118 FC |
597 | /* allocate instance-specific interface IDs, and patch descriptors */ |
598 | status = usb_interface_id(c, f); | |
599 | if (status < 0) | |
600 | goto fail; | |
601 | hidg_interface_desc.bInterfaceNumber = status; | |
602 | ||
71adf118 FC |
603 | /* allocate instance-specific endpoints */ |
604 | status = -ENODEV; | |
605 | ep = usb_ep_autoconfig(c->cdev->gadget, &hidg_fs_in_ep_desc); | |
606 | if (!ep) | |
607 | goto fail; | |
608 | ep->driver_data = c->cdev; /* claim */ | |
609 | hidg->in_ep = ep; | |
610 | ||
99c51500 DM |
611 | ep = usb_ep_autoconfig(c->cdev->gadget, &hidg_fs_out_ep_desc); |
612 | if (!ep) | |
613 | goto fail; | |
614 | ep->driver_data = c->cdev; /* claim */ | |
615 | hidg->out_ep = ep; | |
616 | ||
71adf118 FC |
617 | /* preallocate request and buffer */ |
618 | status = -ENOMEM; | |
619 | hidg->req = usb_ep_alloc_request(hidg->in_ep, GFP_KERNEL); | |
620 | if (!hidg->req) | |
621 | goto fail; | |
622 | ||
71adf118 FC |
623 | hidg->req->buf = kmalloc(hidg->report_length, GFP_KERNEL); |
624 | if (!hidg->req->buf) | |
625 | goto fail; | |
626 | ||
627 | /* set descriptor dynamic values */ | |
628 | hidg_interface_desc.bInterfaceSubClass = hidg->bInterfaceSubClass; | |
629 | hidg_interface_desc.bInterfaceProtocol = hidg->bInterfaceProtocol; | |
630 | hidg_hs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); | |
631 | hidg_fs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); | |
99c51500 DM |
632 | hidg_hs_out_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); |
633 | hidg_fs_out_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); | |
71adf118 FC |
634 | hidg_desc.desc[0].bDescriptorType = HID_DT_REPORT; |
635 | hidg_desc.desc[0].wDescriptorLength = | |
636 | cpu_to_le16(hidg->report_desc_length); | |
637 | ||
10287bae SAS |
638 | hidg_hs_in_ep_desc.bEndpointAddress = |
639 | hidg_fs_in_ep_desc.bEndpointAddress; | |
640 | hidg_hs_out_ep_desc.bEndpointAddress = | |
641 | hidg_fs_out_ep_desc.bEndpointAddress; | |
71adf118 | 642 | |
10287bae SAS |
643 | status = usb_assign_descriptors(f, hidg_fs_descriptors, |
644 | hidg_hs_descriptors, NULL); | |
645 | if (status) | |
646 | goto fail; | |
71adf118 FC |
647 | |
648 | mutex_init(&hidg->lock); | |
649 | spin_lock_init(&hidg->spinlock); | |
650 | init_waitqueue_head(&hidg->write_queue); | |
651 | init_waitqueue_head(&hidg->read_queue); | |
99c51500 | 652 | INIT_LIST_HEAD(&hidg->completed_out_req); |
71adf118 FC |
653 | |
654 | /* create char device */ | |
655 | cdev_init(&hidg->cdev, &f_hidg_fops); | |
656 | dev = MKDEV(major, hidg->minor); | |
657 | status = cdev_add(&hidg->cdev, dev, 1); | |
658 | if (status) | |
d12a8727 | 659 | goto fail_free_descs; |
71adf118 | 660 | |
63406087 AP |
661 | device = device_create(hidg_class, NULL, dev, NULL, |
662 | "%s%d", "hidg", hidg->minor); | |
663 | if (IS_ERR(device)) { | |
664 | status = PTR_ERR(device); | |
665 | goto del; | |
666 | } | |
71adf118 FC |
667 | |
668 | return 0; | |
63406087 AP |
669 | del: |
670 | cdev_del(&hidg->cdev); | |
d12a8727 PM |
671 | fail_free_descs: |
672 | usb_free_all_descriptors(f); | |
71adf118 FC |
673 | fail: |
674 | ERROR(f->config->cdev, "hidg_bind FAILED\n"); | |
675 | if (hidg->req != NULL) { | |
676 | kfree(hidg->req->buf); | |
677 | if (hidg->in_ep != NULL) | |
678 | usb_ep_free_request(hidg->in_ep, hidg->req); | |
679 | } | |
680 | ||
71adf118 FC |
681 | return status; |
682 | } | |
683 | ||
cb382536 AP |
684 | static inline int hidg_get_minor(void) |
685 | { | |
686 | int ret; | |
687 | ||
688 | ret = ida_simple_get(&hidg_ida, 0, 0, GFP_KERNEL); | |
689 | ||
690 | return ret; | |
691 | } | |
692 | ||
21a9476a AP |
693 | static inline struct f_hid_opts *to_f_hid_opts(struct config_item *item) |
694 | { | |
695 | return container_of(to_config_group(item), struct f_hid_opts, | |
696 | func_inst.group); | |
697 | } | |
698 | ||
699 | CONFIGFS_ATTR_STRUCT(f_hid_opts); | |
700 | CONFIGFS_ATTR_OPS(f_hid_opts); | |
701 | ||
702 | static void hid_attr_release(struct config_item *item) | |
703 | { | |
704 | struct f_hid_opts *opts = to_f_hid_opts(item); | |
705 | ||
706 | usb_put_function_instance(&opts->func_inst); | |
707 | } | |
708 | ||
709 | static struct configfs_item_operations hidg_item_ops = { | |
710 | .release = hid_attr_release, | |
711 | .show_attribute = f_hid_opts_attr_show, | |
712 | .store_attribute = f_hid_opts_attr_store, | |
713 | }; | |
714 | ||
715 | #define F_HID_OPT(name, prec, limit) \ | |
716 | static ssize_t f_hid_opts_##name##_show(struct f_hid_opts *opts, char *page)\ | |
717 | { \ | |
718 | int result; \ | |
719 | \ | |
720 | mutex_lock(&opts->lock); \ | |
721 | result = sprintf(page, "%d\n", opts->name); \ | |
722 | mutex_unlock(&opts->lock); \ | |
723 | \ | |
724 | return result; \ | |
725 | } \ | |
726 | \ | |
727 | static ssize_t f_hid_opts_##name##_store(struct f_hid_opts *opts, \ | |
728 | const char *page, size_t len) \ | |
729 | { \ | |
730 | int ret; \ | |
731 | u##prec num; \ | |
732 | \ | |
733 | mutex_lock(&opts->lock); \ | |
734 | if (opts->refcnt) { \ | |
735 | ret = -EBUSY; \ | |
736 | goto end; \ | |
737 | } \ | |
738 | \ | |
739 | ret = kstrtou##prec(page, 0, &num); \ | |
740 | if (ret) \ | |
741 | goto end; \ | |
742 | \ | |
743 | if (num > limit) { \ | |
744 | ret = -EINVAL; \ | |
745 | goto end; \ | |
746 | } \ | |
747 | opts->name = num; \ | |
748 | ret = len; \ | |
749 | \ | |
750 | end: \ | |
751 | mutex_unlock(&opts->lock); \ | |
752 | return ret; \ | |
753 | } \ | |
754 | \ | |
755 | static struct f_hid_opts_attribute f_hid_opts_##name = \ | |
756 | __CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, f_hid_opts_##name##_show,\ | |
757 | f_hid_opts_##name##_store) | |
758 | ||
759 | F_HID_OPT(subclass, 8, 255); | |
760 | F_HID_OPT(protocol, 8, 255); | |
761 | F_HID_OPT(report_length, 16, 65536); | |
762 | ||
763 | static ssize_t f_hid_opts_report_desc_show(struct f_hid_opts *opts, char *page) | |
764 | { | |
765 | int result; | |
766 | ||
767 | mutex_lock(&opts->lock); | |
768 | result = opts->report_desc_length; | |
769 | memcpy(page, opts->report_desc, opts->report_desc_length); | |
770 | mutex_unlock(&opts->lock); | |
771 | ||
772 | return result; | |
773 | } | |
774 | ||
775 | static ssize_t f_hid_opts_report_desc_store(struct f_hid_opts *opts, | |
776 | const char *page, size_t len) | |
777 | { | |
778 | int ret = -EBUSY; | |
779 | char *d; | |
780 | ||
781 | mutex_lock(&opts->lock); | |
782 | ||
783 | if (opts->refcnt) | |
784 | goto end; | |
785 | if (len > PAGE_SIZE) { | |
786 | ret = -ENOSPC; | |
787 | goto end; | |
788 | } | |
789 | d = kmemdup(page, len, GFP_KERNEL); | |
790 | if (!d) { | |
791 | ret = -ENOMEM; | |
792 | goto end; | |
793 | } | |
794 | kfree(opts->report_desc); | |
795 | opts->report_desc = d; | |
796 | opts->report_desc_length = len; | |
797 | opts->report_desc_alloc = true; | |
798 | ret = len; | |
799 | end: | |
800 | mutex_unlock(&opts->lock); | |
801 | return ret; | |
802 | } | |
803 | ||
804 | static struct f_hid_opts_attribute f_hid_opts_report_desc = | |
805 | __CONFIGFS_ATTR(report_desc, S_IRUGO | S_IWUSR, | |
806 | f_hid_opts_report_desc_show, | |
807 | f_hid_opts_report_desc_store); | |
808 | ||
809 | static struct configfs_attribute *hid_attrs[] = { | |
810 | &f_hid_opts_subclass.attr, | |
811 | &f_hid_opts_protocol.attr, | |
812 | &f_hid_opts_report_length.attr, | |
813 | &f_hid_opts_report_desc.attr, | |
814 | NULL, | |
815 | }; | |
816 | ||
817 | static struct config_item_type hid_func_type = { | |
818 | .ct_item_ops = &hidg_item_ops, | |
819 | .ct_attrs = hid_attrs, | |
820 | .ct_owner = THIS_MODULE, | |
821 | }; | |
822 | ||
cb382536 AP |
823 | static inline void hidg_put_minor(int minor) |
824 | { | |
825 | ida_simple_remove(&hidg_ida, minor); | |
826 | } | |
827 | ||
828 | static void hidg_free_inst(struct usb_function_instance *f) | |
829 | { | |
830 | struct f_hid_opts *opts; | |
831 | ||
832 | opts = container_of(f, struct f_hid_opts, func_inst); | |
833 | ||
834 | mutex_lock(&hidg_ida_lock); | |
835 | ||
836 | hidg_put_minor(opts->minor); | |
837 | if (idr_is_empty(&hidg_ida.idr)) | |
838 | ghid_cleanup(); | |
839 | ||
840 | mutex_unlock(&hidg_ida_lock); | |
841 | ||
842 | if (opts->report_desc_alloc) | |
843 | kfree(opts->report_desc); | |
844 | ||
845 | kfree(opts); | |
846 | } | |
847 | ||
848 | static struct usb_function_instance *hidg_alloc_inst(void) | |
849 | { | |
850 | struct f_hid_opts *opts; | |
851 | struct usb_function_instance *ret; | |
852 | int status = 0; | |
853 | ||
854 | opts = kzalloc(sizeof(*opts), GFP_KERNEL); | |
855 | if (!opts) | |
856 | return ERR_PTR(-ENOMEM); | |
21a9476a | 857 | mutex_init(&opts->lock); |
cb382536 AP |
858 | opts->func_inst.free_func_inst = hidg_free_inst; |
859 | ret = &opts->func_inst; | |
860 | ||
861 | mutex_lock(&hidg_ida_lock); | |
862 | ||
863 | if (idr_is_empty(&hidg_ida.idr)) { | |
864 | status = ghid_setup(NULL, HIDG_MINORS); | |
865 | if (status) { | |
866 | ret = ERR_PTR(status); | |
867 | kfree(opts); | |
868 | goto unlock; | |
869 | } | |
870 | } | |
871 | ||
872 | opts->minor = hidg_get_minor(); | |
873 | if (opts->minor < 0) { | |
874 | ret = ERR_PTR(opts->minor); | |
875 | kfree(opts); | |
876 | if (idr_is_empty(&hidg_ida.idr)) | |
877 | ghid_cleanup(); | |
878 | } | |
21a9476a | 879 | config_group_init_type_name(&opts->func_inst.group, "", &hid_func_type); |
cb382536 AP |
880 | |
881 | unlock: | |
882 | mutex_unlock(&hidg_ida_lock); | |
883 | return ret; | |
884 | } | |
885 | ||
886 | static void hidg_free(struct usb_function *f) | |
887 | { | |
888 | struct f_hidg *hidg; | |
21a9476a | 889 | struct f_hid_opts *opts; |
cb382536 AP |
890 | |
891 | hidg = func_to_hidg(f); | |
21a9476a | 892 | opts = container_of(f->fi, struct f_hid_opts, func_inst); |
cb382536 AP |
893 | kfree(hidg->report_desc); |
894 | kfree(hidg); | |
21a9476a AP |
895 | mutex_lock(&opts->lock); |
896 | --opts->refcnt; | |
897 | mutex_unlock(&opts->lock); | |
cb382536 AP |
898 | } |
899 | ||
900 | static void hidg_unbind(struct usb_configuration *c, struct usb_function *f) | |
901 | { | |
902 | struct f_hidg *hidg = func_to_hidg(f); | |
903 | ||
904 | device_destroy(hidg_class, MKDEV(major, hidg->minor)); | |
905 | cdev_del(&hidg->cdev); | |
906 | ||
907 | /* disable/free request and end point */ | |
908 | usb_ep_disable(hidg->in_ep); | |
909 | usb_ep_dequeue(hidg->in_ep, hidg->req); | |
910 | kfree(hidg->req->buf); | |
911 | usb_ep_free_request(hidg->in_ep, hidg->req); | |
912 | ||
913 | usb_free_all_descriptors(f); | |
914 | } | |
915 | ||
0fc57ea0 | 916 | static struct usb_function *hidg_alloc(struct usb_function_instance *fi) |
cb382536 AP |
917 | { |
918 | struct f_hidg *hidg; | |
919 | struct f_hid_opts *opts; | |
920 | ||
921 | /* allocate and initialize one new instance */ | |
922 | hidg = kzalloc(sizeof(*hidg), GFP_KERNEL); | |
923 | if (!hidg) | |
924 | return ERR_PTR(-ENOMEM); | |
925 | ||
926 | opts = container_of(fi, struct f_hid_opts, func_inst); | |
927 | ||
21a9476a AP |
928 | mutex_lock(&opts->lock); |
929 | ++opts->refcnt; | |
930 | ||
cb382536 AP |
931 | hidg->minor = opts->minor; |
932 | hidg->bInterfaceSubClass = opts->subclass; | |
933 | hidg->bInterfaceProtocol = opts->protocol; | |
934 | hidg->report_length = opts->report_length; | |
935 | hidg->report_desc_length = opts->report_desc_length; | |
936 | if (opts->report_desc) { | |
937 | hidg->report_desc = kmemdup(opts->report_desc, | |
938 | opts->report_desc_length, | |
939 | GFP_KERNEL); | |
940 | if (!hidg->report_desc) { | |
941 | kfree(hidg); | |
21a9476a | 942 | mutex_unlock(&opts->lock); |
cb382536 AP |
943 | return ERR_PTR(-ENOMEM); |
944 | } | |
945 | } | |
946 | ||
21a9476a AP |
947 | mutex_unlock(&opts->lock); |
948 | ||
cb382536 | 949 | hidg->func.name = "hid"; |
cb382536 AP |
950 | hidg->func.bind = hidg_bind; |
951 | hidg->func.unbind = hidg_unbind; | |
952 | hidg->func.set_alt = hidg_set_alt; | |
953 | hidg->func.disable = hidg_disable; | |
954 | hidg->func.setup = hidg_setup; | |
955 | hidg->func.free_func = hidg_free; | |
956 | ||
957 | /* this could me made configurable at some point */ | |
958 | hidg->qlen = 4; | |
959 | ||
960 | return &hidg->func; | |
961 | } | |
962 | ||
963 | DECLARE_USB_FUNCTION_INIT(hid, hidg_alloc_inst, hidg_alloc); | |
964 | MODULE_LICENSE("GPL"); | |
965 | MODULE_AUTHOR("Fabien Chouteau"); | |
966 | ||
cb382536 | 967 | int ghid_setup(struct usb_gadget *g, int count) |
71adf118 FC |
968 | { |
969 | int status; | |
970 | dev_t dev; | |
971 | ||
972 | hidg_class = class_create(THIS_MODULE, "hidg"); | |
06529407 AP |
973 | if (IS_ERR(hidg_class)) { |
974 | hidg_class = NULL; | |
975 | return PTR_ERR(hidg_class); | |
976 | } | |
71adf118 FC |
977 | |
978 | status = alloc_chrdev_region(&dev, 0, count, "hidg"); | |
979 | if (!status) { | |
980 | major = MAJOR(dev); | |
981 | minors = count; | |
982 | } | |
983 | ||
984 | return status; | |
985 | } | |
986 | ||
987 | void ghid_cleanup(void) | |
988 | { | |
989 | if (major) { | |
990 | unregister_chrdev_region(MKDEV(major, 0), minors); | |
991 | major = minors = 0; | |
992 | } | |
993 | ||
994 | class_destroy(hidg_class); | |
995 | hidg_class = NULL; | |
996 | } |