Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
c0704541 | 2 | * USB Skeleton driver - 2.2 |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License as | |
8 | * published by the Free Software Foundation, version 2. | |
9 | * | |
c0704541 | 10 | * This driver is based on the 2.6.3 version of drivers/usb/usb-skeleton.c |
121e287c | 11 | * but has been rewritten to be easier to read and use. |
1da177e4 LT |
12 | * |
13 | */ | |
14 | ||
1da177e4 LT |
15 | #include <linux/kernel.h> |
16 | #include <linux/errno.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/kref.h> | |
3ae9da1c | 21 | #include <linux/uaccess.h> |
1da177e4 | 22 | #include <linux/usb.h> |
121e287c | 23 | #include <linux/mutex.h> |
1da177e4 LT |
24 | |
25 | ||
26 | /* Define these values to match your devices */ | |
27 | #define USB_SKEL_VENDOR_ID 0xfff0 | |
28 | #define USB_SKEL_PRODUCT_ID 0xfff0 | |
29 | ||
26c71a79 ML |
30 | static DEFINE_MUTEX(skel_mutex); |
31 | ||
1da177e4 | 32 | /* table of devices that work with this driver */ |
1bd4f29d | 33 | static const struct usb_device_id skel_table[] = { |
1da177e4 LT |
34 | { USB_DEVICE(USB_SKEL_VENDOR_ID, USB_SKEL_PRODUCT_ID) }, |
35 | { } /* Terminating entry */ | |
36 | }; | |
c0704541 | 37 | MODULE_DEVICE_TABLE(usb, skel_table); |
1da177e4 LT |
38 | |
39 | ||
40 | /* Get a minor range for your devices from the usb maintainer */ | |
41 | #define USB_SKEL_MINOR_BASE 192 | |
42 | ||
ff906518 | 43 | /* our private defines. if this grows any larger, use your own .h file */ |
c0704541 | 44 | #define MAX_TRANSFER (PAGE_SIZE - 512) |
ba35e02b ON |
45 | /* MAX_TRANSFER is chosen so that the VM is not stressed by |
46 | allocations > PAGE_SIZE and the number of packets in a page | |
47 | is an integer 512 is the largest possible packet on EHCI */ | |
ff906518 | 48 | #define WRITES_IN_FLIGHT 8 |
ba35e02b | 49 | /* arbitrarily chosen */ |
ff906518 | 50 | |
1da177e4 LT |
51 | /* Structure to hold all of our device specific stuff */ |
52 | struct usb_skel { | |
ba35e02b ON |
53 | struct usb_device *udev; /* the usb device for this device */ |
54 | struct usb_interface *interface; /* the interface for this device */ | |
ff906518 | 55 | struct semaphore limit_sem; /* limiting the number of writes in progress */ |
403dfb58 | 56 | struct usb_anchor submitted; /* in case we need to retract our submissions */ |
e7389cc9 | 57 | struct urb *bulk_in_urb; /* the urb to read data with */ |
c0704541 | 58 | unsigned char *bulk_in_buffer; /* the buffer to receive data */ |
1da177e4 | 59 | size_t bulk_in_size; /* the size of the receive buffer */ |
e7389cc9 ON |
60 | size_t bulk_in_filled; /* number of bytes in the buffer */ |
61 | size_t bulk_in_copied; /* already copied to user space */ | |
1da177e4 LT |
62 | __u8 bulk_in_endpointAddr; /* the address of the bulk in endpoint */ |
63 | __u8 bulk_out_endpointAddr; /* the address of the bulk out endpoint */ | |
403dfb58 | 64 | int errors; /* the last request tanked */ |
e7389cc9 ON |
65 | bool ongoing_read; /* a read is going on */ |
66 | bool processed_urb; /* indicates we haven't processed the urb */ | |
403dfb58 | 67 | spinlock_t err_lock; /* lock for errors */ |
1da177e4 | 68 | struct kref kref; |
121e287c | 69 | struct mutex io_mutex; /* synchronize I/O with disconnect */ |
e7389cc9 | 70 | struct completion bulk_in_completion; /* to wait for an ongoing read */ |
1da177e4 LT |
71 | }; |
72 | #define to_skel_dev(d) container_of(d, struct usb_skel, kref) | |
73 | ||
74 | static struct usb_driver skel_driver; | |
403dfb58 | 75 | static void skel_draw_down(struct usb_skel *dev); |
1da177e4 LT |
76 | |
77 | static void skel_delete(struct kref *kref) | |
c0704541 | 78 | { |
1da177e4 LT |
79 | struct usb_skel *dev = to_skel_dev(kref); |
80 | ||
e7389cc9 | 81 | usb_free_urb(dev->bulk_in_urb); |
1da177e4 | 82 | usb_put_dev(dev->udev); |
c0704541 LFC |
83 | kfree(dev->bulk_in_buffer); |
84 | kfree(dev); | |
1da177e4 LT |
85 | } |
86 | ||
87 | static int skel_open(struct inode *inode, struct file *file) | |
88 | { | |
89 | struct usb_skel *dev; | |
90 | struct usb_interface *interface; | |
91 | int subminor; | |
92 | int retval = 0; | |
93 | ||
94 | subminor = iminor(inode); | |
95 | ||
96 | interface = usb_find_interface(&skel_driver, subminor); | |
97 | if (!interface) { | |
3ae9da1c | 98 | err("%s - error, can't find device for minor %d", |
441b62c1 | 99 | __func__, subminor); |
1da177e4 LT |
100 | retval = -ENODEV; |
101 | goto exit; | |
102 | } | |
103 | ||
26c71a79 | 104 | mutex_lock(&skel_mutex); |
1da177e4 LT |
105 | dev = usb_get_intfdata(interface); |
106 | if (!dev) { | |
26c71a79 | 107 | mutex_unlock(&skel_mutex); |
1da177e4 LT |
108 | retval = -ENODEV; |
109 | goto exit; | |
110 | } | |
111 | ||
5b064708 ON |
112 | /* increment our usage count for the device */ |
113 | kref_get(&dev->kref); | |
26c71a79 | 114 | mutex_unlock(&skel_mutex); |
5b064708 | 115 | |
758f7e16 ON |
116 | /* lock the device to allow correctly handling errors |
117 | * in resumption */ | |
118 | mutex_lock(&dev->io_mutex); | |
26c71a79 ML |
119 | if (!dev->interface) { |
120 | retval = -ENODEV; | |
121 | goto out_err; | |
122 | } | |
758f7e16 | 123 | |
e28dbb06 ML |
124 | retval = usb_autopm_get_interface(interface); |
125 | if (retval) | |
126 | goto out_err; | |
1da177e4 LT |
127 | |
128 | /* save our object in the file's private structure */ | |
129 | file->private_data = dev; | |
26c71a79 ML |
130 | |
131 | out_err: | |
f7294055 | 132 | mutex_unlock(&dev->io_mutex); |
26c71a79 ML |
133 | if (retval) |
134 | kref_put(&dev->kref, skel_delete); | |
1da177e4 LT |
135 | |
136 | exit: | |
137 | return retval; | |
138 | } | |
139 | ||
140 | static int skel_release(struct inode *inode, struct file *file) | |
141 | { | |
142 | struct usb_skel *dev; | |
143 | ||
e53e841d | 144 | dev = file->private_data; |
1da177e4 LT |
145 | if (dev == NULL) |
146 | return -ENODEV; | |
147 | ||
01d883d4 AS |
148 | /* allow the device to be autosuspended */ |
149 | mutex_lock(&dev->io_mutex); | |
e28dbb06 | 150 | if (dev->interface) |
01d883d4 AS |
151 | usb_autopm_put_interface(dev->interface); |
152 | mutex_unlock(&dev->io_mutex); | |
153 | ||
1da177e4 LT |
154 | /* decrement the count on our device */ |
155 | kref_put(&dev->kref, skel_delete); | |
156 | return 0; | |
157 | } | |
158 | ||
403dfb58 ON |
159 | static int skel_flush(struct file *file, fl_owner_t id) |
160 | { | |
161 | struct usb_skel *dev; | |
162 | int res; | |
163 | ||
e53e841d | 164 | dev = file->private_data; |
403dfb58 ON |
165 | if (dev == NULL) |
166 | return -ENODEV; | |
167 | ||
168 | /* wait for io to stop */ | |
169 | mutex_lock(&dev->io_mutex); | |
170 | skel_draw_down(dev); | |
171 | ||
172 | /* read out errors, leave subsequent opens a clean slate */ | |
173 | spin_lock_irq(&dev->err_lock); | |
174 | res = dev->errors ? (dev->errors == -EPIPE ? -EPIPE : -EIO) : 0; | |
175 | dev->errors = 0; | |
176 | spin_unlock_irq(&dev->err_lock); | |
177 | ||
178 | mutex_unlock(&dev->io_mutex); | |
179 | ||
180 | return res; | |
181 | } | |
182 | ||
e7389cc9 ON |
183 | static void skel_read_bulk_callback(struct urb *urb) |
184 | { | |
185 | struct usb_skel *dev; | |
186 | ||
187 | dev = urb->context; | |
188 | ||
189 | spin_lock(&dev->err_lock); | |
190 | /* sync/async unlink faults aren't errors */ | |
191 | if (urb->status) { | |
3ae9da1c | 192 | if (!(urb->status == -ENOENT || |
e7389cc9 ON |
193 | urb->status == -ECONNRESET || |
194 | urb->status == -ESHUTDOWN)) | |
195 | err("%s - nonzero write bulk status received: %d", | |
196 | __func__, urb->status); | |
197 | ||
198 | dev->errors = urb->status; | |
199 | } else { | |
200 | dev->bulk_in_filled = urb->actual_length; | |
201 | } | |
202 | dev->ongoing_read = 0; | |
203 | spin_unlock(&dev->err_lock); | |
204 | ||
205 | complete(&dev->bulk_in_completion); | |
206 | } | |
207 | ||
208 | static int skel_do_read_io(struct usb_skel *dev, size_t count) | |
209 | { | |
210 | int rv; | |
211 | ||
212 | /* prepare a read */ | |
213 | usb_fill_bulk_urb(dev->bulk_in_urb, | |
214 | dev->udev, | |
215 | usb_rcvbulkpipe(dev->udev, | |
216 | dev->bulk_in_endpointAddr), | |
217 | dev->bulk_in_buffer, | |
218 | min(dev->bulk_in_size, count), | |
219 | skel_read_bulk_callback, | |
220 | dev); | |
221 | /* tell everybody to leave the URB alone */ | |
222 | spin_lock_irq(&dev->err_lock); | |
223 | dev->ongoing_read = 1; | |
224 | spin_unlock_irq(&dev->err_lock); | |
225 | ||
226 | /* do it */ | |
227 | rv = usb_submit_urb(dev->bulk_in_urb, GFP_KERNEL); | |
228 | if (rv < 0) { | |
229 | err("%s - failed submitting read urb, error %d", | |
230 | __func__, rv); | |
231 | dev->bulk_in_filled = 0; | |
232 | rv = (rv == -ENOMEM) ? rv : -EIO; | |
233 | spin_lock_irq(&dev->err_lock); | |
234 | dev->ongoing_read = 0; | |
235 | spin_unlock_irq(&dev->err_lock); | |
236 | } | |
237 | ||
238 | return rv; | |
239 | } | |
240 | ||
3ae9da1c GKH |
241 | static ssize_t skel_read(struct file *file, char *buffer, size_t count, |
242 | loff_t *ppos) | |
1da177e4 LT |
243 | { |
244 | struct usb_skel *dev; | |
e7389cc9 ON |
245 | int rv; |
246 | bool ongoing_io; | |
1da177e4 | 247 | |
e53e841d | 248 | dev = file->private_data; |
121e287c | 249 | |
e7389cc9 ON |
250 | /* if we cannot read at all, return EOF */ |
251 | if (!dev->bulk_in_urb || !count) | |
252 | return 0; | |
253 | ||
254 | /* no concurrent readers */ | |
255 | rv = mutex_lock_interruptible(&dev->io_mutex); | |
256 | if (rv < 0) | |
257 | return rv; | |
258 | ||
121e287c | 259 | if (!dev->interface) { /* disconnect() was called */ |
e7389cc9 | 260 | rv = -ENODEV; |
121e287c AS |
261 | goto exit; |
262 | } | |
263 | ||
e7389cc9 ON |
264 | /* if IO is under way, we must not touch things */ |
265 | retry: | |
266 | spin_lock_irq(&dev->err_lock); | |
267 | ongoing_io = dev->ongoing_read; | |
268 | spin_unlock_irq(&dev->err_lock); | |
269 | ||
270 | if (ongoing_io) { | |
8cd01664 ON |
271 | /* nonblocking IO shall not wait */ |
272 | if (file->f_flags & O_NONBLOCK) { | |
273 | rv = -EAGAIN; | |
274 | goto exit; | |
275 | } | |
e7389cc9 ON |
276 | /* |
277 | * IO may take forever | |
278 | * hence wait in an interruptible state | |
279 | */ | |
280 | rv = wait_for_completion_interruptible(&dev->bulk_in_completion); | |
281 | if (rv < 0) | |
282 | goto exit; | |
283 | /* | |
284 | * by waiting we also semiprocessed the urb | |
285 | * we must finish now | |
286 | */ | |
287 | dev->bulk_in_copied = 0; | |
288 | dev->processed_urb = 1; | |
289 | } | |
290 | ||
291 | if (!dev->processed_urb) { | |
292 | /* | |
293 | * the URB hasn't been processed | |
294 | * do it now | |
295 | */ | |
296 | wait_for_completion(&dev->bulk_in_completion); | |
297 | dev->bulk_in_copied = 0; | |
298 | dev->processed_urb = 1; | |
1da177e4 LT |
299 | } |
300 | ||
e7389cc9 | 301 | /* errors must be reported */ |
3ae9da1c GKH |
302 | rv = dev->errors; |
303 | if (rv < 0) { | |
e7389cc9 ON |
304 | /* any error is reported once */ |
305 | dev->errors = 0; | |
306 | /* to preserve notifications about reset */ | |
307 | rv = (rv == -EPIPE) ? rv : -EIO; | |
308 | /* no data to deliver */ | |
309 | dev->bulk_in_filled = 0; | |
310 | /* report it */ | |
311 | goto exit; | |
312 | } | |
313 | ||
314 | /* | |
315 | * if the buffer is filled we may satisfy the read | |
316 | * else we need to start IO | |
317 | */ | |
318 | ||
319 | if (dev->bulk_in_filled) { | |
320 | /* we had read data */ | |
321 | size_t available = dev->bulk_in_filled - dev->bulk_in_copied; | |
322 | size_t chunk = min(available, count); | |
323 | ||
324 | if (!available) { | |
325 | /* | |
326 | * all data has been used | |
327 | * actual IO needs to be done | |
328 | */ | |
329 | rv = skel_do_read_io(dev, count); | |
330 | if (rv < 0) | |
331 | goto exit; | |
332 | else | |
333 | goto retry; | |
334 | } | |
335 | /* | |
336 | * data is available | |
337 | * chunk tells us how much shall be copied | |
338 | */ | |
339 | ||
340 | if (copy_to_user(buffer, | |
341 | dev->bulk_in_buffer + dev->bulk_in_copied, | |
342 | chunk)) | |
343 | rv = -EFAULT; | |
344 | else | |
345 | rv = chunk; | |
346 | ||
347 | dev->bulk_in_copied += chunk; | |
348 | ||
349 | /* | |
350 | * if we are asked for more than we have, | |
351 | * we start IO but don't wait | |
352 | */ | |
353 | if (available < count) | |
354 | skel_do_read_io(dev, count - chunk); | |
355 | } else { | |
356 | /* no data in the buffer */ | |
357 | rv = skel_do_read_io(dev, count); | |
358 | if (rv < 0) | |
359 | goto exit; | |
4de84057 | 360 | else if (!(file->f_flags & O_NONBLOCK)) |
e7389cc9 | 361 | goto retry; |
8cd01664 | 362 | rv = -EAGAIN; |
e7389cc9 | 363 | } |
121e287c AS |
364 | exit: |
365 | mutex_unlock(&dev->io_mutex); | |
e7389cc9 | 366 | return rv; |
1da177e4 LT |
367 | } |
368 | ||
7d12e780 | 369 | static void skel_write_bulk_callback(struct urb *urb) |
1da177e4 LT |
370 | { |
371 | struct usb_skel *dev; | |
372 | ||
cdc97792 | 373 | dev = urb->context; |
1da177e4 LT |
374 | |
375 | /* sync/async unlink faults aren't errors */ | |
403dfb58 | 376 | if (urb->status) { |
3ae9da1c | 377 | if (!(urb->status == -ENOENT || |
403dfb58 ON |
378 | urb->status == -ECONNRESET || |
379 | urb->status == -ESHUTDOWN)) | |
380 | err("%s - nonzero write bulk status received: %d", | |
441b62c1 | 381 | __func__, urb->status); |
403dfb58 ON |
382 | |
383 | spin_lock(&dev->err_lock); | |
384 | dev->errors = urb->status; | |
385 | spin_unlock(&dev->err_lock); | |
1da177e4 LT |
386 | } |
387 | ||
388 | /* free up our allocated buffer */ | |
997ea58e DM |
389 | usb_free_coherent(urb->dev, urb->transfer_buffer_length, |
390 | urb->transfer_buffer, urb->transfer_dma); | |
ff906518 | 391 | up(&dev->limit_sem); |
1da177e4 LT |
392 | } |
393 | ||
3ae9da1c GKH |
394 | static ssize_t skel_write(struct file *file, const char *user_buffer, |
395 | size_t count, loff_t *ppos) | |
1da177e4 LT |
396 | { |
397 | struct usb_skel *dev; | |
398 | int retval = 0; | |
399 | struct urb *urb = NULL; | |
400 | char *buf = NULL; | |
c8dd7709 | 401 | size_t writesize = min(count, (size_t)MAX_TRANSFER); |
1da177e4 | 402 | |
e53e841d | 403 | dev = file->private_data; |
1da177e4 LT |
404 | |
405 | /* verify that we actually have some data to write */ | |
406 | if (count == 0) | |
407 | goto exit; | |
408 | ||
3ae9da1c GKH |
409 | /* |
410 | * limit the number of URBs in flight to stop a user from using up all | |
411 | * RAM | |
412 | */ | |
4de84057 | 413 | if (!(file->f_flags & O_NONBLOCK)) { |
79819986 ON |
414 | if (down_interruptible(&dev->limit_sem)) { |
415 | retval = -ERESTARTSYS; | |
416 | goto exit; | |
417 | } | |
418 | } else { | |
419 | if (down_trylock(&dev->limit_sem)) { | |
420 | retval = -EAGAIN; | |
421 | goto exit; | |
422 | } | |
c8dd7709 | 423 | } |
ff906518 | 424 | |
403dfb58 | 425 | spin_lock_irq(&dev->err_lock); |
3ae9da1c GKH |
426 | retval = dev->errors; |
427 | if (retval < 0) { | |
403dfb58 ON |
428 | /* any error is reported once */ |
429 | dev->errors = 0; | |
430 | /* to preserve notifications about reset */ | |
431 | retval = (retval == -EPIPE) ? retval : -EIO; | |
432 | } | |
433 | spin_unlock_irq(&dev->err_lock); | |
434 | if (retval < 0) | |
435 | goto error; | |
436 | ||
1da177e4 LT |
437 | /* create a urb, and a buffer for it, and copy the data to the urb */ |
438 | urb = usb_alloc_urb(0, GFP_KERNEL); | |
439 | if (!urb) { | |
440 | retval = -ENOMEM; | |
441 | goto error; | |
442 | } | |
443 | ||
997ea58e DM |
444 | buf = usb_alloc_coherent(dev->udev, writesize, GFP_KERNEL, |
445 | &urb->transfer_dma); | |
1da177e4 LT |
446 | if (!buf) { |
447 | retval = -ENOMEM; | |
448 | goto error; | |
449 | } | |
450 | ||
ff906518 | 451 | if (copy_from_user(buf, user_buffer, writesize)) { |
1da177e4 LT |
452 | retval = -EFAULT; |
453 | goto error; | |
454 | } | |
455 | ||
ba35e02b ON |
456 | /* this lock makes sure we don't submit URBs to gone devices */ |
457 | mutex_lock(&dev->io_mutex); | |
458 | if (!dev->interface) { /* disconnect() was called */ | |
459 | mutex_unlock(&dev->io_mutex); | |
460 | retval = -ENODEV; | |
461 | goto error; | |
462 | } | |
463 | ||
1da177e4 LT |
464 | /* initialize the urb properly */ |
465 | usb_fill_bulk_urb(urb, dev->udev, | |
466 | usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr), | |
ff906518 | 467 | buf, writesize, skel_write_bulk_callback, dev); |
1da177e4 | 468 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
403dfb58 | 469 | usb_anchor_urb(urb, &dev->submitted); |
1da177e4 LT |
470 | |
471 | /* send the data out the bulk port */ | |
472 | retval = usb_submit_urb(urb, GFP_KERNEL); | |
ba35e02b | 473 | mutex_unlock(&dev->io_mutex); |
1da177e4 | 474 | if (retval) { |
3ae9da1c GKH |
475 | err("%s - failed submitting write urb, error %d", __func__, |
476 | retval); | |
403dfb58 | 477 | goto error_unanchor; |
1da177e4 LT |
478 | } |
479 | ||
3ae9da1c GKH |
480 | /* |
481 | * release our reference to this urb, the USB core will eventually free | |
482 | * it entirely | |
483 | */ | |
1da177e4 LT |
484 | usb_free_urb(urb); |
485 | ||
ba35e02b | 486 | |
ff906518 | 487 | return writesize; |
1da177e4 | 488 | |
403dfb58 ON |
489 | error_unanchor: |
490 | usb_unanchor_urb(urb); | |
1da177e4 | 491 | error: |
121e287c | 492 | if (urb) { |
997ea58e | 493 | usb_free_coherent(dev->udev, writesize, buf, urb->transfer_dma); |
121e287c AS |
494 | usb_free_urb(urb); |
495 | } | |
ff906518 | 496 | up(&dev->limit_sem); |
121e287c AS |
497 | |
498 | exit: | |
1da177e4 LT |
499 | return retval; |
500 | } | |
501 | ||
066202dd | 502 | static const struct file_operations skel_fops = { |
1da177e4 LT |
503 | .owner = THIS_MODULE, |
504 | .read = skel_read, | |
505 | .write = skel_write, | |
506 | .open = skel_open, | |
507 | .release = skel_release, | |
403dfb58 | 508 | .flush = skel_flush, |
6038f373 | 509 | .llseek = noop_llseek, |
1da177e4 LT |
510 | }; |
511 | ||
c0704541 | 512 | /* |
1da177e4 | 513 | * usb class driver info in order to get a minor number from the usb core, |
595b14cb | 514 | * and to have the device registered with the driver core |
1da177e4 LT |
515 | */ |
516 | static struct usb_class_driver skel_class = { | |
d6e5bcf4 | 517 | .name = "skel%d", |
1da177e4 | 518 | .fops = &skel_fops, |
1da177e4 LT |
519 | .minor_base = USB_SKEL_MINOR_BASE, |
520 | }; | |
521 | ||
3ae9da1c GKH |
522 | static int skel_probe(struct usb_interface *interface, |
523 | const struct usb_device_id *id) | |
1da177e4 | 524 | { |
c0704541 | 525 | struct usb_skel *dev; |
1da177e4 LT |
526 | struct usb_host_interface *iface_desc; |
527 | struct usb_endpoint_descriptor *endpoint; | |
528 | size_t buffer_size; | |
529 | int i; | |
530 | int retval = -ENOMEM; | |
531 | ||
532 | /* allocate memory for our device state and initialize it */ | |
ff906518 | 533 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
c0704541 | 534 | if (!dev) { |
1da177e4 LT |
535 | err("Out of memory"); |
536 | goto error; | |
537 | } | |
1da177e4 | 538 | kref_init(&dev->kref); |
ff906518 | 539 | sema_init(&dev->limit_sem, WRITES_IN_FLIGHT); |
121e287c | 540 | mutex_init(&dev->io_mutex); |
403dfb58 ON |
541 | spin_lock_init(&dev->err_lock); |
542 | init_usb_anchor(&dev->submitted); | |
e7389cc9 | 543 | init_completion(&dev->bulk_in_completion); |
1da177e4 LT |
544 | |
545 | dev->udev = usb_get_dev(interface_to_usbdev(interface)); | |
546 | dev->interface = interface; | |
547 | ||
548 | /* set up the endpoint information */ | |
549 | /* use only the first bulk-in and bulk-out endpoints */ | |
550 | iface_desc = interface->cur_altsetting; | |
551 | for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { | |
552 | endpoint = &iface_desc->endpoint[i].desc; | |
553 | ||
554 | if (!dev->bulk_in_endpointAddr && | |
c0704541 | 555 | usb_endpoint_is_bulk_in(endpoint)) { |
1da177e4 | 556 | /* we found a bulk in endpoint */ |
29cc8897 | 557 | buffer_size = usb_endpoint_maxp(endpoint); |
1da177e4 LT |
558 | dev->bulk_in_size = buffer_size; |
559 | dev->bulk_in_endpointAddr = endpoint->bEndpointAddress; | |
560 | dev->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL); | |
561 | if (!dev->bulk_in_buffer) { | |
562 | err("Could not allocate bulk_in_buffer"); | |
563 | goto error; | |
564 | } | |
e7389cc9 ON |
565 | dev->bulk_in_urb = usb_alloc_urb(0, GFP_KERNEL); |
566 | if (!dev->bulk_in_urb) { | |
567 | err("Could not allocate bulk_in_urb"); | |
568 | goto error; | |
569 | } | |
1da177e4 LT |
570 | } |
571 | ||
572 | if (!dev->bulk_out_endpointAddr && | |
c0704541 | 573 | usb_endpoint_is_bulk_out(endpoint)) { |
1da177e4 LT |
574 | /* we found a bulk out endpoint */ |
575 | dev->bulk_out_endpointAddr = endpoint->bEndpointAddress; | |
576 | } | |
577 | } | |
578 | if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) { | |
579 | err("Could not find both bulk-in and bulk-out endpoints"); | |
580 | goto error; | |
581 | } | |
582 | ||
583 | /* save our data pointer in this interface device */ | |
584 | usb_set_intfdata(interface, dev); | |
585 | ||
586 | /* we can register the device now, as it is ready */ | |
587 | retval = usb_register_dev(interface, &skel_class); | |
588 | if (retval) { | |
589 | /* something prevented us from registering this driver */ | |
590 | err("Not able to get a minor for this device."); | |
591 | usb_set_intfdata(interface, NULL); | |
592 | goto error; | |
593 | } | |
594 | ||
595 | /* let the user know what node this device is now attached to */ | |
a5f5ea23 MK |
596 | dev_info(&interface->dev, |
597 | "USB Skeleton device now attached to USBSkel-%d", | |
598 | interface->minor); | |
1da177e4 LT |
599 | return 0; |
600 | ||
601 | error: | |
602 | if (dev) | |
ba35e02b | 603 | /* this frees allocated memory */ |
1da177e4 LT |
604 | kref_put(&dev->kref, skel_delete); |
605 | return retval; | |
606 | } | |
607 | ||
608 | static void skel_disconnect(struct usb_interface *interface) | |
609 | { | |
610 | struct usb_skel *dev; | |
611 | int minor = interface->minor; | |
612 | ||
1da177e4 | 613 | dev = usb_get_intfdata(interface); |
1da177e4 LT |
614 | |
615 | /* give back our minor */ | |
616 | usb_deregister_dev(interface, &skel_class); | |
617 | ||
121e287c AS |
618 | /* prevent more I/O from starting */ |
619 | mutex_lock(&dev->io_mutex); | |
620 | dev->interface = NULL; | |
621 | mutex_unlock(&dev->io_mutex); | |
622 | ||
e73c7247 ON |
623 | usb_kill_anchored_urbs(&dev->submitted); |
624 | ||
26c71a79 ML |
625 | mutex_lock(&skel_mutex); |
626 | usb_set_intfdata(interface, NULL); | |
627 | ||
1da177e4 LT |
628 | /* decrement our usage count */ |
629 | kref_put(&dev->kref, skel_delete); | |
26c71a79 | 630 | mutex_unlock(&skel_mutex); |
1da177e4 | 631 | |
a5f5ea23 | 632 | dev_info(&interface->dev, "USB Skeleton #%d now disconnected", minor); |
1da177e4 LT |
633 | } |
634 | ||
403dfb58 ON |
635 | static void skel_draw_down(struct usb_skel *dev) |
636 | { | |
637 | int time; | |
638 | ||
639 | time = usb_wait_anchor_empty_timeout(&dev->submitted, 1000); | |
640 | if (!time) | |
641 | usb_kill_anchored_urbs(&dev->submitted); | |
e7389cc9 | 642 | usb_kill_urb(dev->bulk_in_urb); |
403dfb58 ON |
643 | } |
644 | ||
758f7e16 ON |
645 | static int skel_suspend(struct usb_interface *intf, pm_message_t message) |
646 | { | |
647 | struct usb_skel *dev = usb_get_intfdata(intf); | |
648 | ||
649 | if (!dev) | |
650 | return 0; | |
651 | skel_draw_down(dev); | |
652 | return 0; | |
653 | } | |
654 | ||
3ae9da1c | 655 | static int skel_resume(struct usb_interface *intf) |
758f7e16 ON |
656 | { |
657 | return 0; | |
658 | } | |
659 | ||
87d093e2 ON |
660 | static int skel_pre_reset(struct usb_interface *intf) |
661 | { | |
662 | struct usb_skel *dev = usb_get_intfdata(intf); | |
663 | ||
664 | mutex_lock(&dev->io_mutex); | |
665 | skel_draw_down(dev); | |
666 | ||
667 | return 0; | |
668 | } | |
669 | ||
670 | static int skel_post_reset(struct usb_interface *intf) | |
671 | { | |
672 | struct usb_skel *dev = usb_get_intfdata(intf); | |
673 | ||
674 | /* we are sure no URBs are active - no locking needed */ | |
675 | dev->errors = -EPIPE; | |
676 | mutex_unlock(&dev->io_mutex); | |
677 | ||
678 | return 0; | |
679 | } | |
680 | ||
1da177e4 | 681 | static struct usb_driver skel_driver = { |
1da177e4 LT |
682 | .name = "skeleton", |
683 | .probe = skel_probe, | |
684 | .disconnect = skel_disconnect, | |
758f7e16 ON |
685 | .suspend = skel_suspend, |
686 | .resume = skel_resume, | |
87d093e2 ON |
687 | .pre_reset = skel_pre_reset, |
688 | .post_reset = skel_post_reset, | |
1da177e4 | 689 | .id_table = skel_table, |
ba35e02b | 690 | .supports_autosuspend = 1, |
1da177e4 LT |
691 | }; |
692 | ||
65db4305 | 693 | module_usb_driver(skel_driver); |
1da177e4 LT |
694 | |
695 | MODULE_LICENSE("GPL"); |