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 | ||
30 | /* table of devices that work with this driver */ | |
1bd4f29d | 31 | static const struct usb_device_id skel_table[] = { |
1da177e4 LT |
32 | { USB_DEVICE(USB_SKEL_VENDOR_ID, USB_SKEL_PRODUCT_ID) }, |
33 | { } /* Terminating entry */ | |
34 | }; | |
c0704541 | 35 | MODULE_DEVICE_TABLE(usb, skel_table); |
1da177e4 LT |
36 | |
37 | ||
38 | /* Get a minor range for your devices from the usb maintainer */ | |
39 | #define USB_SKEL_MINOR_BASE 192 | |
40 | ||
ff906518 | 41 | /* our private defines. if this grows any larger, use your own .h file */ |
c0704541 | 42 | #define MAX_TRANSFER (PAGE_SIZE - 512) |
ba35e02b ON |
43 | /* MAX_TRANSFER is chosen so that the VM is not stressed by |
44 | allocations > PAGE_SIZE and the number of packets in a page | |
45 | is an integer 512 is the largest possible packet on EHCI */ | |
ff906518 | 46 | #define WRITES_IN_FLIGHT 8 |
ba35e02b | 47 | /* arbitrarily chosen */ |
ff906518 | 48 | |
1da177e4 LT |
49 | /* Structure to hold all of our device specific stuff */ |
50 | struct usb_skel { | |
ba35e02b ON |
51 | struct usb_device *udev; /* the usb device for this device */ |
52 | struct usb_interface *interface; /* the interface for this device */ | |
ff906518 | 53 | struct semaphore limit_sem; /* limiting the number of writes in progress */ |
403dfb58 | 54 | struct usb_anchor submitted; /* in case we need to retract our submissions */ |
e7389cc9 | 55 | struct urb *bulk_in_urb; /* the urb to read data with */ |
c0704541 | 56 | unsigned char *bulk_in_buffer; /* the buffer to receive data */ |
1da177e4 | 57 | size_t bulk_in_size; /* the size of the receive buffer */ |
e7389cc9 ON |
58 | size_t bulk_in_filled; /* number of bytes in the buffer */ |
59 | size_t bulk_in_copied; /* already copied to user space */ | |
1da177e4 LT |
60 | __u8 bulk_in_endpointAddr; /* the address of the bulk in endpoint */ |
61 | __u8 bulk_out_endpointAddr; /* the address of the bulk out endpoint */ | |
403dfb58 | 62 | int errors; /* the last request tanked */ |
e7389cc9 ON |
63 | bool ongoing_read; /* a read is going on */ |
64 | bool processed_urb; /* indicates we haven't processed the urb */ | |
403dfb58 | 65 | spinlock_t err_lock; /* lock for errors */ |
1da177e4 | 66 | struct kref kref; |
121e287c | 67 | struct mutex io_mutex; /* synchronize I/O with disconnect */ |
e7389cc9 | 68 | struct completion bulk_in_completion; /* to wait for an ongoing read */ |
1da177e4 LT |
69 | }; |
70 | #define to_skel_dev(d) container_of(d, struct usb_skel, kref) | |
71 | ||
72 | static struct usb_driver skel_driver; | |
403dfb58 | 73 | static void skel_draw_down(struct usb_skel *dev); |
1da177e4 LT |
74 | |
75 | static void skel_delete(struct kref *kref) | |
c0704541 | 76 | { |
1da177e4 LT |
77 | struct usb_skel *dev = to_skel_dev(kref); |
78 | ||
e7389cc9 | 79 | usb_free_urb(dev->bulk_in_urb); |
1da177e4 | 80 | usb_put_dev(dev->udev); |
c0704541 LFC |
81 | kfree(dev->bulk_in_buffer); |
82 | kfree(dev); | |
1da177e4 LT |
83 | } |
84 | ||
85 | static int skel_open(struct inode *inode, struct file *file) | |
86 | { | |
87 | struct usb_skel *dev; | |
88 | struct usb_interface *interface; | |
89 | int subminor; | |
90 | int retval = 0; | |
91 | ||
92 | subminor = iminor(inode); | |
93 | ||
94 | interface = usb_find_interface(&skel_driver, subminor); | |
95 | if (!interface) { | |
4212cd74 GKH |
96 | pr_err("%s - error, can't find device for minor %d\n", |
97 | __func__, subminor); | |
1da177e4 LT |
98 | retval = -ENODEV; |
99 | goto exit; | |
100 | } | |
101 | ||
102 | dev = usb_get_intfdata(interface); | |
103 | if (!dev) { | |
104 | retval = -ENODEV; | |
105 | goto exit; | |
106 | } | |
107 | ||
5b064708 ON |
108 | /* increment our usage count for the device */ |
109 | kref_get(&dev->kref); | |
110 | ||
758f7e16 ON |
111 | /* lock the device to allow correctly handling errors |
112 | * in resumption */ | |
113 | mutex_lock(&dev->io_mutex); | |
114 | ||
e28dbb06 ML |
115 | retval = usb_autopm_get_interface(interface); |
116 | if (retval) | |
117 | goto out_err; | |
1da177e4 LT |
118 | |
119 | /* save our object in the file's private structure */ | |
120 | file->private_data = dev; | |
f7294055 | 121 | mutex_unlock(&dev->io_mutex); |
1da177e4 LT |
122 | |
123 | exit: | |
124 | return retval; | |
125 | } | |
126 | ||
127 | static int skel_release(struct inode *inode, struct file *file) | |
128 | { | |
129 | struct usb_skel *dev; | |
130 | ||
e53e841d | 131 | dev = file->private_data; |
1da177e4 LT |
132 | if (dev == NULL) |
133 | return -ENODEV; | |
134 | ||
01d883d4 AS |
135 | /* allow the device to be autosuspended */ |
136 | mutex_lock(&dev->io_mutex); | |
e28dbb06 | 137 | if (dev->interface) |
01d883d4 AS |
138 | usb_autopm_put_interface(dev->interface); |
139 | mutex_unlock(&dev->io_mutex); | |
140 | ||
1da177e4 LT |
141 | /* decrement the count on our device */ |
142 | kref_put(&dev->kref, skel_delete); | |
143 | return 0; | |
144 | } | |
145 | ||
403dfb58 ON |
146 | static int skel_flush(struct file *file, fl_owner_t id) |
147 | { | |
148 | struct usb_skel *dev; | |
149 | int res; | |
150 | ||
e53e841d | 151 | dev = file->private_data; |
403dfb58 ON |
152 | if (dev == NULL) |
153 | return -ENODEV; | |
154 | ||
155 | /* wait for io to stop */ | |
156 | mutex_lock(&dev->io_mutex); | |
157 | skel_draw_down(dev); | |
158 | ||
159 | /* read out errors, leave subsequent opens a clean slate */ | |
160 | spin_lock_irq(&dev->err_lock); | |
161 | res = dev->errors ? (dev->errors == -EPIPE ? -EPIPE : -EIO) : 0; | |
162 | dev->errors = 0; | |
163 | spin_unlock_irq(&dev->err_lock); | |
164 | ||
165 | mutex_unlock(&dev->io_mutex); | |
166 | ||
167 | return res; | |
168 | } | |
169 | ||
e7389cc9 ON |
170 | static void skel_read_bulk_callback(struct urb *urb) |
171 | { | |
172 | struct usb_skel *dev; | |
173 | ||
174 | dev = urb->context; | |
175 | ||
176 | spin_lock(&dev->err_lock); | |
177 | /* sync/async unlink faults aren't errors */ | |
178 | if (urb->status) { | |
3ae9da1c | 179 | if (!(urb->status == -ENOENT || |
e7389cc9 ON |
180 | urb->status == -ECONNRESET || |
181 | urb->status == -ESHUTDOWN)) | |
4212cd74 GKH |
182 | dev_err(&dev->interface->dev, |
183 | "%s - nonzero write bulk status received: %d\n", | |
184 | __func__, urb->status); | |
e7389cc9 ON |
185 | |
186 | dev->errors = urb->status; | |
187 | } else { | |
188 | dev->bulk_in_filled = urb->actual_length; | |
189 | } | |
190 | dev->ongoing_read = 0; | |
191 | spin_unlock(&dev->err_lock); | |
192 | ||
193 | complete(&dev->bulk_in_completion); | |
194 | } | |
195 | ||
196 | static int skel_do_read_io(struct usb_skel *dev, size_t count) | |
197 | { | |
198 | int rv; | |
199 | ||
200 | /* prepare a read */ | |
201 | usb_fill_bulk_urb(dev->bulk_in_urb, | |
202 | dev->udev, | |
203 | usb_rcvbulkpipe(dev->udev, | |
204 | dev->bulk_in_endpointAddr), | |
205 | dev->bulk_in_buffer, | |
206 | min(dev->bulk_in_size, count), | |
207 | skel_read_bulk_callback, | |
208 | dev); | |
209 | /* tell everybody to leave the URB alone */ | |
210 | spin_lock_irq(&dev->err_lock); | |
211 | dev->ongoing_read = 1; | |
212 | spin_unlock_irq(&dev->err_lock); | |
213 | ||
214 | /* do it */ | |
215 | rv = usb_submit_urb(dev->bulk_in_urb, GFP_KERNEL); | |
216 | if (rv < 0) { | |
4212cd74 GKH |
217 | dev_err(&dev->interface->dev, |
218 | "%s - failed submitting read urb, error %d\n", | |
e7389cc9 ON |
219 | __func__, rv); |
220 | dev->bulk_in_filled = 0; | |
221 | rv = (rv == -ENOMEM) ? rv : -EIO; | |
222 | spin_lock_irq(&dev->err_lock); | |
223 | dev->ongoing_read = 0; | |
224 | spin_unlock_irq(&dev->err_lock); | |
225 | } | |
226 | ||
227 | return rv; | |
228 | } | |
229 | ||
3ae9da1c GKH |
230 | static ssize_t skel_read(struct file *file, char *buffer, size_t count, |
231 | loff_t *ppos) | |
1da177e4 LT |
232 | { |
233 | struct usb_skel *dev; | |
e7389cc9 ON |
234 | int rv; |
235 | bool ongoing_io; | |
1da177e4 | 236 | |
e53e841d | 237 | dev = file->private_data; |
121e287c | 238 | |
e7389cc9 ON |
239 | /* if we cannot read at all, return EOF */ |
240 | if (!dev->bulk_in_urb || !count) | |
241 | return 0; | |
242 | ||
243 | /* no concurrent readers */ | |
244 | rv = mutex_lock_interruptible(&dev->io_mutex); | |
245 | if (rv < 0) | |
246 | return rv; | |
247 | ||
121e287c | 248 | if (!dev->interface) { /* disconnect() was called */ |
e7389cc9 | 249 | rv = -ENODEV; |
121e287c AS |
250 | goto exit; |
251 | } | |
252 | ||
e7389cc9 ON |
253 | /* if IO is under way, we must not touch things */ |
254 | retry: | |
255 | spin_lock_irq(&dev->err_lock); | |
256 | ongoing_io = dev->ongoing_read; | |
257 | spin_unlock_irq(&dev->err_lock); | |
258 | ||
259 | if (ongoing_io) { | |
8cd01664 ON |
260 | /* nonblocking IO shall not wait */ |
261 | if (file->f_flags & O_NONBLOCK) { | |
262 | rv = -EAGAIN; | |
263 | goto exit; | |
264 | } | |
e7389cc9 ON |
265 | /* |
266 | * IO may take forever | |
267 | * hence wait in an interruptible state | |
268 | */ | |
269 | rv = wait_for_completion_interruptible(&dev->bulk_in_completion); | |
270 | if (rv < 0) | |
271 | goto exit; | |
272 | /* | |
273 | * by waiting we also semiprocessed the urb | |
274 | * we must finish now | |
275 | */ | |
276 | dev->bulk_in_copied = 0; | |
277 | dev->processed_urb = 1; | |
278 | } | |
279 | ||
280 | if (!dev->processed_urb) { | |
281 | /* | |
282 | * the URB hasn't been processed | |
283 | * do it now | |
284 | */ | |
285 | wait_for_completion(&dev->bulk_in_completion); | |
286 | dev->bulk_in_copied = 0; | |
287 | dev->processed_urb = 1; | |
1da177e4 LT |
288 | } |
289 | ||
e7389cc9 | 290 | /* errors must be reported */ |
3ae9da1c GKH |
291 | rv = dev->errors; |
292 | if (rv < 0) { | |
e7389cc9 ON |
293 | /* any error is reported once */ |
294 | dev->errors = 0; | |
295 | /* to preserve notifications about reset */ | |
296 | rv = (rv == -EPIPE) ? rv : -EIO; | |
297 | /* no data to deliver */ | |
298 | dev->bulk_in_filled = 0; | |
299 | /* report it */ | |
300 | goto exit; | |
301 | } | |
302 | ||
303 | /* | |
304 | * if the buffer is filled we may satisfy the read | |
305 | * else we need to start IO | |
306 | */ | |
307 | ||
308 | if (dev->bulk_in_filled) { | |
309 | /* we had read data */ | |
310 | size_t available = dev->bulk_in_filled - dev->bulk_in_copied; | |
311 | size_t chunk = min(available, count); | |
312 | ||
313 | if (!available) { | |
314 | /* | |
315 | * all data has been used | |
316 | * actual IO needs to be done | |
317 | */ | |
318 | rv = skel_do_read_io(dev, count); | |
319 | if (rv < 0) | |
320 | goto exit; | |
321 | else | |
322 | goto retry; | |
323 | } | |
324 | /* | |
325 | * data is available | |
326 | * chunk tells us how much shall be copied | |
327 | */ | |
328 | ||
329 | if (copy_to_user(buffer, | |
330 | dev->bulk_in_buffer + dev->bulk_in_copied, | |
331 | chunk)) | |
332 | rv = -EFAULT; | |
333 | else | |
334 | rv = chunk; | |
335 | ||
336 | dev->bulk_in_copied += chunk; | |
337 | ||
338 | /* | |
339 | * if we are asked for more than we have, | |
340 | * we start IO but don't wait | |
341 | */ | |
342 | if (available < count) | |
343 | skel_do_read_io(dev, count - chunk); | |
344 | } else { | |
345 | /* no data in the buffer */ | |
346 | rv = skel_do_read_io(dev, count); | |
347 | if (rv < 0) | |
348 | goto exit; | |
4de84057 | 349 | else if (!(file->f_flags & O_NONBLOCK)) |
e7389cc9 | 350 | goto retry; |
8cd01664 | 351 | rv = -EAGAIN; |
e7389cc9 | 352 | } |
121e287c AS |
353 | exit: |
354 | mutex_unlock(&dev->io_mutex); | |
e7389cc9 | 355 | return rv; |
1da177e4 LT |
356 | } |
357 | ||
7d12e780 | 358 | static void skel_write_bulk_callback(struct urb *urb) |
1da177e4 LT |
359 | { |
360 | struct usb_skel *dev; | |
361 | ||
cdc97792 | 362 | dev = urb->context; |
1da177e4 LT |
363 | |
364 | /* sync/async unlink faults aren't errors */ | |
403dfb58 | 365 | if (urb->status) { |
3ae9da1c | 366 | if (!(urb->status == -ENOENT || |
403dfb58 ON |
367 | urb->status == -ECONNRESET || |
368 | urb->status == -ESHUTDOWN)) | |
4212cd74 GKH |
369 | dev_err(&dev->interface->dev, |
370 | "%s - nonzero write bulk status received: %d\n", | |
371 | __func__, urb->status); | |
403dfb58 ON |
372 | |
373 | spin_lock(&dev->err_lock); | |
374 | dev->errors = urb->status; | |
375 | spin_unlock(&dev->err_lock); | |
1da177e4 LT |
376 | } |
377 | ||
378 | /* free up our allocated buffer */ | |
997ea58e DM |
379 | usb_free_coherent(urb->dev, urb->transfer_buffer_length, |
380 | urb->transfer_buffer, urb->transfer_dma); | |
ff906518 | 381 | up(&dev->limit_sem); |
1da177e4 LT |
382 | } |
383 | ||
3ae9da1c GKH |
384 | static ssize_t skel_write(struct file *file, const char *user_buffer, |
385 | size_t count, loff_t *ppos) | |
1da177e4 LT |
386 | { |
387 | struct usb_skel *dev; | |
388 | int retval = 0; | |
389 | struct urb *urb = NULL; | |
390 | char *buf = NULL; | |
c8dd7709 | 391 | size_t writesize = min(count, (size_t)MAX_TRANSFER); |
1da177e4 | 392 | |
e53e841d | 393 | dev = file->private_data; |
1da177e4 LT |
394 | |
395 | /* verify that we actually have some data to write */ | |
396 | if (count == 0) | |
397 | goto exit; | |
398 | ||
3ae9da1c GKH |
399 | /* |
400 | * limit the number of URBs in flight to stop a user from using up all | |
401 | * RAM | |
402 | */ | |
4de84057 | 403 | if (!(file->f_flags & O_NONBLOCK)) { |
79819986 ON |
404 | if (down_interruptible(&dev->limit_sem)) { |
405 | retval = -ERESTARTSYS; | |
406 | goto exit; | |
407 | } | |
408 | } else { | |
409 | if (down_trylock(&dev->limit_sem)) { | |
410 | retval = -EAGAIN; | |
411 | goto exit; | |
412 | } | |
c8dd7709 | 413 | } |
ff906518 | 414 | |
403dfb58 | 415 | spin_lock_irq(&dev->err_lock); |
3ae9da1c GKH |
416 | retval = dev->errors; |
417 | if (retval < 0) { | |
403dfb58 ON |
418 | /* any error is reported once */ |
419 | dev->errors = 0; | |
420 | /* to preserve notifications about reset */ | |
421 | retval = (retval == -EPIPE) ? retval : -EIO; | |
422 | } | |
423 | spin_unlock_irq(&dev->err_lock); | |
424 | if (retval < 0) | |
425 | goto error; | |
426 | ||
1da177e4 LT |
427 | /* create a urb, and a buffer for it, and copy the data to the urb */ |
428 | urb = usb_alloc_urb(0, GFP_KERNEL); | |
429 | if (!urb) { | |
430 | retval = -ENOMEM; | |
431 | goto error; | |
432 | } | |
433 | ||
997ea58e DM |
434 | buf = usb_alloc_coherent(dev->udev, writesize, GFP_KERNEL, |
435 | &urb->transfer_dma); | |
1da177e4 LT |
436 | if (!buf) { |
437 | retval = -ENOMEM; | |
438 | goto error; | |
439 | } | |
440 | ||
ff906518 | 441 | if (copy_from_user(buf, user_buffer, writesize)) { |
1da177e4 LT |
442 | retval = -EFAULT; |
443 | goto error; | |
444 | } | |
445 | ||
ba35e02b ON |
446 | /* this lock makes sure we don't submit URBs to gone devices */ |
447 | mutex_lock(&dev->io_mutex); | |
448 | if (!dev->interface) { /* disconnect() was called */ | |
449 | mutex_unlock(&dev->io_mutex); | |
450 | retval = -ENODEV; | |
451 | goto error; | |
452 | } | |
453 | ||
1da177e4 LT |
454 | /* initialize the urb properly */ |
455 | usb_fill_bulk_urb(urb, dev->udev, | |
456 | usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr), | |
ff906518 | 457 | buf, writesize, skel_write_bulk_callback, dev); |
1da177e4 | 458 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
403dfb58 | 459 | usb_anchor_urb(urb, &dev->submitted); |
1da177e4 LT |
460 | |
461 | /* send the data out the bulk port */ | |
462 | retval = usb_submit_urb(urb, GFP_KERNEL); | |
ba35e02b | 463 | mutex_unlock(&dev->io_mutex); |
1da177e4 | 464 | if (retval) { |
4212cd74 GKH |
465 | dev_err(&dev->interface->dev, |
466 | "%s - failed submitting write urb, error %d\n", | |
467 | __func__, retval); | |
403dfb58 | 468 | goto error_unanchor; |
1da177e4 LT |
469 | } |
470 | ||
3ae9da1c GKH |
471 | /* |
472 | * release our reference to this urb, the USB core will eventually free | |
473 | * it entirely | |
474 | */ | |
1da177e4 LT |
475 | usb_free_urb(urb); |
476 | ||
ba35e02b | 477 | |
ff906518 | 478 | return writesize; |
1da177e4 | 479 | |
403dfb58 ON |
480 | error_unanchor: |
481 | usb_unanchor_urb(urb); | |
1da177e4 | 482 | error: |
121e287c | 483 | if (urb) { |
997ea58e | 484 | usb_free_coherent(dev->udev, writesize, buf, urb->transfer_dma); |
121e287c AS |
485 | usb_free_urb(urb); |
486 | } | |
ff906518 | 487 | up(&dev->limit_sem); |
121e287c AS |
488 | |
489 | exit: | |
1da177e4 LT |
490 | return retval; |
491 | } | |
492 | ||
066202dd | 493 | static const struct file_operations skel_fops = { |
1da177e4 LT |
494 | .owner = THIS_MODULE, |
495 | .read = skel_read, | |
496 | .write = skel_write, | |
497 | .open = skel_open, | |
498 | .release = skel_release, | |
403dfb58 | 499 | .flush = skel_flush, |
6038f373 | 500 | .llseek = noop_llseek, |
1da177e4 LT |
501 | }; |
502 | ||
c0704541 | 503 | /* |
1da177e4 | 504 | * usb class driver info in order to get a minor number from the usb core, |
595b14cb | 505 | * and to have the device registered with the driver core |
1da177e4 LT |
506 | */ |
507 | static struct usb_class_driver skel_class = { | |
d6e5bcf4 | 508 | .name = "skel%d", |
1da177e4 | 509 | .fops = &skel_fops, |
1da177e4 LT |
510 | .minor_base = USB_SKEL_MINOR_BASE, |
511 | }; | |
512 | ||
3ae9da1c GKH |
513 | static int skel_probe(struct usb_interface *interface, |
514 | const struct usb_device_id *id) | |
1da177e4 | 515 | { |
c0704541 | 516 | struct usb_skel *dev; |
1da177e4 LT |
517 | struct usb_host_interface *iface_desc; |
518 | struct usb_endpoint_descriptor *endpoint; | |
519 | size_t buffer_size; | |
520 | int i; | |
521 | int retval = -ENOMEM; | |
522 | ||
523 | /* allocate memory for our device state and initialize it */ | |
ff906518 | 524 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
c0704541 | 525 | if (!dev) { |
4212cd74 | 526 | dev_err(&interface->dev, "Out of memory\n"); |
1da177e4 LT |
527 | goto error; |
528 | } | |
1da177e4 | 529 | kref_init(&dev->kref); |
ff906518 | 530 | sema_init(&dev->limit_sem, WRITES_IN_FLIGHT); |
121e287c | 531 | mutex_init(&dev->io_mutex); |
403dfb58 ON |
532 | spin_lock_init(&dev->err_lock); |
533 | init_usb_anchor(&dev->submitted); | |
e7389cc9 | 534 | init_completion(&dev->bulk_in_completion); |
1da177e4 LT |
535 | |
536 | dev->udev = usb_get_dev(interface_to_usbdev(interface)); | |
537 | dev->interface = interface; | |
538 | ||
539 | /* set up the endpoint information */ | |
540 | /* use only the first bulk-in and bulk-out endpoints */ | |
541 | iface_desc = interface->cur_altsetting; | |
542 | for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { | |
543 | endpoint = &iface_desc->endpoint[i].desc; | |
544 | ||
545 | if (!dev->bulk_in_endpointAddr && | |
c0704541 | 546 | usb_endpoint_is_bulk_in(endpoint)) { |
1da177e4 | 547 | /* we found a bulk in endpoint */ |
29cc8897 | 548 | buffer_size = usb_endpoint_maxp(endpoint); |
1da177e4 LT |
549 | dev->bulk_in_size = buffer_size; |
550 | dev->bulk_in_endpointAddr = endpoint->bEndpointAddress; | |
551 | dev->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL); | |
552 | if (!dev->bulk_in_buffer) { | |
4212cd74 GKH |
553 | dev_err(&interface->dev, |
554 | "Could not allocate bulk_in_buffer\n"); | |
1da177e4 LT |
555 | goto error; |
556 | } | |
e7389cc9 ON |
557 | dev->bulk_in_urb = usb_alloc_urb(0, GFP_KERNEL); |
558 | if (!dev->bulk_in_urb) { | |
4212cd74 GKH |
559 | dev_err(&interface->dev, |
560 | "Could not allocate bulk_in_urb\n"); | |
e7389cc9 ON |
561 | goto error; |
562 | } | |
1da177e4 LT |
563 | } |
564 | ||
565 | if (!dev->bulk_out_endpointAddr && | |
c0704541 | 566 | usb_endpoint_is_bulk_out(endpoint)) { |
1da177e4 LT |
567 | /* we found a bulk out endpoint */ |
568 | dev->bulk_out_endpointAddr = endpoint->bEndpointAddress; | |
569 | } | |
570 | } | |
571 | if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) { | |
4212cd74 GKH |
572 | dev_err(&interface->dev, |
573 | "Could not find both bulk-in and bulk-out endpoints\n"); | |
1da177e4 LT |
574 | goto error; |
575 | } | |
576 | ||
577 | /* save our data pointer in this interface device */ | |
578 | usb_set_intfdata(interface, dev); | |
579 | ||
580 | /* we can register the device now, as it is ready */ | |
581 | retval = usb_register_dev(interface, &skel_class); | |
582 | if (retval) { | |
583 | /* something prevented us from registering this driver */ | |
4212cd74 GKH |
584 | dev_err(&interface->dev, |
585 | "Not able to get a minor for this device.\n"); | |
1da177e4 LT |
586 | usb_set_intfdata(interface, NULL); |
587 | goto error; | |
588 | } | |
589 | ||
590 | /* let the user know what node this device is now attached to */ | |
a5f5ea23 MK |
591 | dev_info(&interface->dev, |
592 | "USB Skeleton device now attached to USBSkel-%d", | |
593 | interface->minor); | |
1da177e4 LT |
594 | return 0; |
595 | ||
596 | error: | |
597 | if (dev) | |
ba35e02b | 598 | /* this frees allocated memory */ |
1da177e4 LT |
599 | kref_put(&dev->kref, skel_delete); |
600 | return retval; | |
601 | } | |
602 | ||
603 | static void skel_disconnect(struct usb_interface *interface) | |
604 | { | |
605 | struct usb_skel *dev; | |
606 | int minor = interface->minor; | |
607 | ||
1da177e4 | 608 | dev = usb_get_intfdata(interface); |
52a74999 | 609 | usb_set_intfdata(interface, NULL); |
1da177e4 LT |
610 | |
611 | /* give back our minor */ | |
612 | usb_deregister_dev(interface, &skel_class); | |
613 | ||
121e287c AS |
614 | /* prevent more I/O from starting */ |
615 | mutex_lock(&dev->io_mutex); | |
616 | dev->interface = NULL; | |
617 | mutex_unlock(&dev->io_mutex); | |
618 | ||
e73c7247 ON |
619 | usb_kill_anchored_urbs(&dev->submitted); |
620 | ||
1da177e4 LT |
621 | /* decrement our usage count */ |
622 | kref_put(&dev->kref, skel_delete); | |
623 | ||
a5f5ea23 | 624 | dev_info(&interface->dev, "USB Skeleton #%d now disconnected", minor); |
1da177e4 LT |
625 | } |
626 | ||
403dfb58 ON |
627 | static void skel_draw_down(struct usb_skel *dev) |
628 | { | |
629 | int time; | |
630 | ||
631 | time = usb_wait_anchor_empty_timeout(&dev->submitted, 1000); | |
632 | if (!time) | |
633 | usb_kill_anchored_urbs(&dev->submitted); | |
e7389cc9 | 634 | usb_kill_urb(dev->bulk_in_urb); |
403dfb58 ON |
635 | } |
636 | ||
758f7e16 ON |
637 | static int skel_suspend(struct usb_interface *intf, pm_message_t message) |
638 | { | |
639 | struct usb_skel *dev = usb_get_intfdata(intf); | |
640 | ||
641 | if (!dev) | |
642 | return 0; | |
643 | skel_draw_down(dev); | |
644 | return 0; | |
645 | } | |
646 | ||
3ae9da1c | 647 | static int skel_resume(struct usb_interface *intf) |
758f7e16 ON |
648 | { |
649 | return 0; | |
650 | } | |
651 | ||
87d093e2 ON |
652 | static int skel_pre_reset(struct usb_interface *intf) |
653 | { | |
654 | struct usb_skel *dev = usb_get_intfdata(intf); | |
655 | ||
656 | mutex_lock(&dev->io_mutex); | |
657 | skel_draw_down(dev); | |
658 | ||
659 | return 0; | |
660 | } | |
661 | ||
662 | static int skel_post_reset(struct usb_interface *intf) | |
663 | { | |
664 | struct usb_skel *dev = usb_get_intfdata(intf); | |
665 | ||
666 | /* we are sure no URBs are active - no locking needed */ | |
667 | dev->errors = -EPIPE; | |
668 | mutex_unlock(&dev->io_mutex); | |
669 | ||
670 | return 0; | |
671 | } | |
672 | ||
1da177e4 | 673 | static struct usb_driver skel_driver = { |
1da177e4 LT |
674 | .name = "skeleton", |
675 | .probe = skel_probe, | |
676 | .disconnect = skel_disconnect, | |
758f7e16 ON |
677 | .suspend = skel_suspend, |
678 | .resume = skel_resume, | |
87d093e2 ON |
679 | .pre_reset = skel_pre_reset, |
680 | .post_reset = skel_post_reset, | |
1da177e4 | 681 | .id_table = skel_table, |
ba35e02b | 682 | .supports_autosuspend = 1, |
1da177e4 LT |
683 | }; |
684 | ||
65db4305 | 685 | module_usb_driver(skel_driver); |
1da177e4 LT |
686 | |
687 | MODULE_LICENSE("GPL"); |