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> | |
21 | #include <asm/uaccess.h> | |
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 */ | |
31 | static struct usb_device_id skel_table [] = { | |
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 */ |
758f7e16 | 63 | int open_count; /* count the number of openers */ |
e7389cc9 ON |
64 | bool ongoing_read; /* a read is going on */ |
65 | bool processed_urb; /* indicates we haven't processed the urb */ | |
403dfb58 | 66 | spinlock_t err_lock; /* lock for errors */ |
1da177e4 | 67 | struct kref kref; |
121e287c | 68 | struct mutex io_mutex; /* synchronize I/O with disconnect */ |
e7389cc9 | 69 | struct completion bulk_in_completion; /* to wait for an ongoing read */ |
1da177e4 LT |
70 | }; |
71 | #define to_skel_dev(d) container_of(d, struct usb_skel, kref) | |
72 | ||
73 | static struct usb_driver skel_driver; | |
403dfb58 | 74 | static void skel_draw_down(struct usb_skel *dev); |
1da177e4 LT |
75 | |
76 | static void skel_delete(struct kref *kref) | |
c0704541 | 77 | { |
1da177e4 LT |
78 | struct usb_skel *dev = to_skel_dev(kref); |
79 | ||
e7389cc9 | 80 | usb_free_urb(dev->bulk_in_urb); |
1da177e4 | 81 | usb_put_dev(dev->udev); |
c0704541 LFC |
82 | kfree(dev->bulk_in_buffer); |
83 | kfree(dev); | |
1da177e4 LT |
84 | } |
85 | ||
86 | static int skel_open(struct inode *inode, struct file *file) | |
87 | { | |
88 | struct usb_skel *dev; | |
89 | struct usb_interface *interface; | |
90 | int subminor; | |
91 | int retval = 0; | |
92 | ||
93 | subminor = iminor(inode); | |
94 | ||
95 | interface = usb_find_interface(&skel_driver, subminor); | |
96 | if (!interface) { | |
97 | err ("%s - error, can't find device for minor %d", | |
441b62c1 | 98 | __func__, subminor); |
1da177e4 LT |
99 | retval = -ENODEV; |
100 | goto exit; | |
101 | } | |
102 | ||
103 | dev = usb_get_intfdata(interface); | |
104 | if (!dev) { | |
105 | retval = -ENODEV; | |
106 | goto exit; | |
107 | } | |
108 | ||
5b064708 ON |
109 | /* increment our usage count for the device */ |
110 | kref_get(&dev->kref); | |
111 | ||
758f7e16 ON |
112 | /* lock the device to allow correctly handling errors |
113 | * in resumption */ | |
114 | mutex_lock(&dev->io_mutex); | |
115 | ||
116 | if (!dev->open_count++) { | |
117 | retval = usb_autopm_get_interface(interface); | |
118 | if (retval) { | |
119 | dev->open_count--; | |
120 | mutex_unlock(&dev->io_mutex); | |
121 | kref_put(&dev->kref, skel_delete); | |
122 | goto exit; | |
123 | } | |
124 | } /* else { //uncomment this block if you want exclusive open | |
125 | retval = -EBUSY; | |
126 | dev->open_count--; | |
127 | mutex_unlock(&dev->io_mutex); | |
5b064708 | 128 | kref_put(&dev->kref, skel_delete); |
01d883d4 | 129 | goto exit; |
758f7e16 ON |
130 | } */ |
131 | /* prevent the device from being autosuspended */ | |
1da177e4 LT |
132 | |
133 | /* save our object in the file's private structure */ | |
134 | file->private_data = dev; | |
f7294055 | 135 | mutex_unlock(&dev->io_mutex); |
1da177e4 LT |
136 | |
137 | exit: | |
138 | return retval; | |
139 | } | |
140 | ||
141 | static int skel_release(struct inode *inode, struct file *file) | |
142 | { | |
143 | struct usb_skel *dev; | |
144 | ||
145 | dev = (struct usb_skel *)file->private_data; | |
146 | if (dev == NULL) | |
147 | return -ENODEV; | |
148 | ||
01d883d4 AS |
149 | /* allow the device to be autosuspended */ |
150 | mutex_lock(&dev->io_mutex); | |
758f7e16 | 151 | if (!--dev->open_count && dev->interface) |
01d883d4 AS |
152 | usb_autopm_put_interface(dev->interface); |
153 | mutex_unlock(&dev->io_mutex); | |
154 | ||
1da177e4 LT |
155 | /* decrement the count on our device */ |
156 | kref_put(&dev->kref, skel_delete); | |
157 | return 0; | |
158 | } | |
159 | ||
403dfb58 ON |
160 | static int skel_flush(struct file *file, fl_owner_t id) |
161 | { | |
162 | struct usb_skel *dev; | |
163 | int res; | |
164 | ||
165 | dev = (struct usb_skel *)file->private_data; | |
166 | if (dev == NULL) | |
167 | return -ENODEV; | |
168 | ||
169 | /* wait for io to stop */ | |
170 | mutex_lock(&dev->io_mutex); | |
171 | skel_draw_down(dev); | |
172 | ||
173 | /* read out errors, leave subsequent opens a clean slate */ | |
174 | spin_lock_irq(&dev->err_lock); | |
175 | res = dev->errors ? (dev->errors == -EPIPE ? -EPIPE : -EIO) : 0; | |
176 | dev->errors = 0; | |
177 | spin_unlock_irq(&dev->err_lock); | |
178 | ||
179 | mutex_unlock(&dev->io_mutex); | |
180 | ||
181 | return res; | |
182 | } | |
183 | ||
e7389cc9 ON |
184 | static void skel_read_bulk_callback(struct urb *urb) |
185 | { | |
186 | struct usb_skel *dev; | |
187 | ||
188 | dev = urb->context; | |
189 | ||
190 | spin_lock(&dev->err_lock); | |
191 | /* sync/async unlink faults aren't errors */ | |
192 | if (urb->status) { | |
193 | if(!(urb->status == -ENOENT || | |
194 | urb->status == -ECONNRESET || | |
195 | urb->status == -ESHUTDOWN)) | |
196 | err("%s - nonzero write bulk status received: %d", | |
197 | __func__, urb->status); | |
198 | ||
199 | dev->errors = urb->status; | |
200 | } else { | |
201 | dev->bulk_in_filled = urb->actual_length; | |
202 | } | |
203 | dev->ongoing_read = 0; | |
204 | spin_unlock(&dev->err_lock); | |
205 | ||
206 | complete(&dev->bulk_in_completion); | |
207 | } | |
208 | ||
209 | static int skel_do_read_io(struct usb_skel *dev, size_t count) | |
210 | { | |
211 | int rv; | |
212 | ||
213 | /* prepare a read */ | |
214 | usb_fill_bulk_urb(dev->bulk_in_urb, | |
215 | dev->udev, | |
216 | usb_rcvbulkpipe(dev->udev, | |
217 | dev->bulk_in_endpointAddr), | |
218 | dev->bulk_in_buffer, | |
219 | min(dev->bulk_in_size, count), | |
220 | skel_read_bulk_callback, | |
221 | dev); | |
222 | /* tell everybody to leave the URB alone */ | |
223 | spin_lock_irq(&dev->err_lock); | |
224 | dev->ongoing_read = 1; | |
225 | spin_unlock_irq(&dev->err_lock); | |
226 | ||
227 | /* do it */ | |
228 | rv = usb_submit_urb(dev->bulk_in_urb, GFP_KERNEL); | |
229 | if (rv < 0) { | |
230 | err("%s - failed submitting read urb, error %d", | |
231 | __func__, rv); | |
232 | dev->bulk_in_filled = 0; | |
233 | rv = (rv == -ENOMEM) ? rv : -EIO; | |
234 | spin_lock_irq(&dev->err_lock); | |
235 | dev->ongoing_read = 0; | |
236 | spin_unlock_irq(&dev->err_lock); | |
237 | } | |
238 | ||
239 | return rv; | |
240 | } | |
241 | ||
1da177e4 LT |
242 | static ssize_t skel_read(struct file *file, char *buffer, size_t count, loff_t *ppos) |
243 | { | |
244 | struct usb_skel *dev; | |
e7389cc9 ON |
245 | int rv; |
246 | bool ongoing_io; | |
1da177e4 LT |
247 | |
248 | dev = (struct usb_skel *)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) { | |
271 | /* | |
272 | * IO may take forever | |
273 | * hence wait in an interruptible state | |
274 | */ | |
275 | rv = wait_for_completion_interruptible(&dev->bulk_in_completion); | |
276 | if (rv < 0) | |
277 | goto exit; | |
278 | /* | |
279 | * by waiting we also semiprocessed the urb | |
280 | * we must finish now | |
281 | */ | |
282 | dev->bulk_in_copied = 0; | |
283 | dev->processed_urb = 1; | |
284 | } | |
285 | ||
286 | if (!dev->processed_urb) { | |
287 | /* | |
288 | * the URB hasn't been processed | |
289 | * do it now | |
290 | */ | |
291 | wait_for_completion(&dev->bulk_in_completion); | |
292 | dev->bulk_in_copied = 0; | |
293 | dev->processed_urb = 1; | |
1da177e4 LT |
294 | } |
295 | ||
e7389cc9 ON |
296 | /* errors must be reported */ |
297 | if ((rv = dev->errors) < 0) { | |
298 | /* any error is reported once */ | |
299 | dev->errors = 0; | |
300 | /* to preserve notifications about reset */ | |
301 | rv = (rv == -EPIPE) ? rv : -EIO; | |
302 | /* no data to deliver */ | |
303 | dev->bulk_in_filled = 0; | |
304 | /* report it */ | |
305 | goto exit; | |
306 | } | |
307 | ||
308 | /* | |
309 | * if the buffer is filled we may satisfy the read | |
310 | * else we need to start IO | |
311 | */ | |
312 | ||
313 | if (dev->bulk_in_filled) { | |
314 | /* we had read data */ | |
315 | size_t available = dev->bulk_in_filled - dev->bulk_in_copied; | |
316 | size_t chunk = min(available, count); | |
317 | ||
318 | if (!available) { | |
319 | /* | |
320 | * all data has been used | |
321 | * actual IO needs to be done | |
322 | */ | |
323 | rv = skel_do_read_io(dev, count); | |
324 | if (rv < 0) | |
325 | goto exit; | |
326 | else | |
327 | goto retry; | |
328 | } | |
329 | /* | |
330 | * data is available | |
331 | * chunk tells us how much shall be copied | |
332 | */ | |
333 | ||
334 | if (copy_to_user(buffer, | |
335 | dev->bulk_in_buffer + dev->bulk_in_copied, | |
336 | chunk)) | |
337 | rv = -EFAULT; | |
338 | else | |
339 | rv = chunk; | |
340 | ||
341 | dev->bulk_in_copied += chunk; | |
342 | ||
343 | /* | |
344 | * if we are asked for more than we have, | |
345 | * we start IO but don't wait | |
346 | */ | |
347 | if (available < count) | |
348 | skel_do_read_io(dev, count - chunk); | |
349 | } else { | |
350 | /* no data in the buffer */ | |
351 | rv = skel_do_read_io(dev, count); | |
352 | if (rv < 0) | |
353 | goto exit; | |
354 | else | |
355 | goto retry; | |
356 | } | |
121e287c AS |
357 | exit: |
358 | mutex_unlock(&dev->io_mutex); | |
e7389cc9 | 359 | return rv; |
1da177e4 LT |
360 | } |
361 | ||
7d12e780 | 362 | static void skel_write_bulk_callback(struct urb *urb) |
1da177e4 LT |
363 | { |
364 | struct usb_skel *dev; | |
365 | ||
cdc97792 | 366 | dev = urb->context; |
1da177e4 LT |
367 | |
368 | /* sync/async unlink faults aren't errors */ | |
403dfb58 ON |
369 | if (urb->status) { |
370 | if(!(urb->status == -ENOENT || | |
371 | urb->status == -ECONNRESET || | |
372 | urb->status == -ESHUTDOWN)) | |
373 | err("%s - nonzero write bulk status received: %d", | |
441b62c1 | 374 | __func__, urb->status); |
403dfb58 ON |
375 | |
376 | spin_lock(&dev->err_lock); | |
377 | dev->errors = urb->status; | |
378 | spin_unlock(&dev->err_lock); | |
1da177e4 LT |
379 | } |
380 | ||
381 | /* free up our allocated buffer */ | |
c0704541 | 382 | usb_buffer_free(urb->dev, urb->transfer_buffer_length, |
1da177e4 | 383 | urb->transfer_buffer, urb->transfer_dma); |
ff906518 | 384 | up(&dev->limit_sem); |
1da177e4 LT |
385 | } |
386 | ||
387 | static ssize_t skel_write(struct file *file, const char *user_buffer, size_t count, loff_t *ppos) | |
388 | { | |
389 | struct usb_skel *dev; | |
390 | int retval = 0; | |
391 | struct urb *urb = NULL; | |
392 | char *buf = NULL; | |
c8dd7709 | 393 | size_t writesize = min(count, (size_t)MAX_TRANSFER); |
1da177e4 LT |
394 | |
395 | dev = (struct usb_skel *)file->private_data; | |
396 | ||
397 | /* verify that we actually have some data to write */ | |
398 | if (count == 0) | |
399 | goto exit; | |
400 | ||
ff906518 | 401 | /* limit the number of URBs in flight to stop a user from using up all RAM */ |
c8dd7709 SB |
402 | if (down_interruptible(&dev->limit_sem)) { |
403 | retval = -ERESTARTSYS; | |
404 | goto exit; | |
405 | } | |
ff906518 | 406 | |
403dfb58 ON |
407 | spin_lock_irq(&dev->err_lock); |
408 | if ((retval = dev->errors) < 0) { | |
409 | /* any error is reported once */ | |
410 | dev->errors = 0; | |
411 | /* to preserve notifications about reset */ | |
412 | retval = (retval == -EPIPE) ? retval : -EIO; | |
413 | } | |
414 | spin_unlock_irq(&dev->err_lock); | |
415 | if (retval < 0) | |
416 | goto error; | |
417 | ||
1da177e4 LT |
418 | /* create a urb, and a buffer for it, and copy the data to the urb */ |
419 | urb = usb_alloc_urb(0, GFP_KERNEL); | |
420 | if (!urb) { | |
421 | retval = -ENOMEM; | |
422 | goto error; | |
423 | } | |
424 | ||
ff906518 | 425 | buf = usb_buffer_alloc(dev->udev, writesize, GFP_KERNEL, &urb->transfer_dma); |
1da177e4 LT |
426 | if (!buf) { |
427 | retval = -ENOMEM; | |
428 | goto error; | |
429 | } | |
430 | ||
ff906518 | 431 | if (copy_from_user(buf, user_buffer, writesize)) { |
1da177e4 LT |
432 | retval = -EFAULT; |
433 | goto error; | |
434 | } | |
435 | ||
ba35e02b ON |
436 | /* this lock makes sure we don't submit URBs to gone devices */ |
437 | mutex_lock(&dev->io_mutex); | |
438 | if (!dev->interface) { /* disconnect() was called */ | |
439 | mutex_unlock(&dev->io_mutex); | |
440 | retval = -ENODEV; | |
441 | goto error; | |
442 | } | |
443 | ||
1da177e4 LT |
444 | /* initialize the urb properly */ |
445 | usb_fill_bulk_urb(urb, dev->udev, | |
446 | usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr), | |
ff906518 | 447 | buf, writesize, skel_write_bulk_callback, dev); |
1da177e4 | 448 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
403dfb58 | 449 | usb_anchor_urb(urb, &dev->submitted); |
1da177e4 LT |
450 | |
451 | /* send the data out the bulk port */ | |
452 | retval = usb_submit_urb(urb, GFP_KERNEL); | |
ba35e02b | 453 | mutex_unlock(&dev->io_mutex); |
1da177e4 | 454 | if (retval) { |
441b62c1 | 455 | err("%s - failed submitting write urb, error %d", __func__, retval); |
403dfb58 | 456 | goto error_unanchor; |
1da177e4 LT |
457 | } |
458 | ||
459 | /* release our reference to this urb, the USB core will eventually free it entirely */ | |
460 | usb_free_urb(urb); | |
461 | ||
ba35e02b | 462 | |
ff906518 | 463 | return writesize; |
1da177e4 | 464 | |
403dfb58 ON |
465 | error_unanchor: |
466 | usb_unanchor_urb(urb); | |
1da177e4 | 467 | error: |
121e287c AS |
468 | if (urb) { |
469 | usb_buffer_free(dev->udev, writesize, buf, urb->transfer_dma); | |
470 | usb_free_urb(urb); | |
471 | } | |
ff906518 | 472 | up(&dev->limit_sem); |
121e287c AS |
473 | |
474 | exit: | |
1da177e4 LT |
475 | return retval; |
476 | } | |
477 | ||
066202dd | 478 | static const struct file_operations skel_fops = { |
1da177e4 LT |
479 | .owner = THIS_MODULE, |
480 | .read = skel_read, | |
481 | .write = skel_write, | |
482 | .open = skel_open, | |
483 | .release = skel_release, | |
403dfb58 | 484 | .flush = skel_flush, |
1da177e4 LT |
485 | }; |
486 | ||
c0704541 | 487 | /* |
1da177e4 | 488 | * usb class driver info in order to get a minor number from the usb core, |
595b14cb | 489 | * and to have the device registered with the driver core |
1da177e4 LT |
490 | */ |
491 | static struct usb_class_driver skel_class = { | |
d6e5bcf4 | 492 | .name = "skel%d", |
1da177e4 | 493 | .fops = &skel_fops, |
1da177e4 LT |
494 | .minor_base = USB_SKEL_MINOR_BASE, |
495 | }; | |
496 | ||
497 | static int skel_probe(struct usb_interface *interface, const struct usb_device_id *id) | |
498 | { | |
c0704541 | 499 | struct usb_skel *dev; |
1da177e4 LT |
500 | struct usb_host_interface *iface_desc; |
501 | struct usb_endpoint_descriptor *endpoint; | |
502 | size_t buffer_size; | |
503 | int i; | |
504 | int retval = -ENOMEM; | |
505 | ||
506 | /* allocate memory for our device state and initialize it */ | |
ff906518 | 507 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
c0704541 | 508 | if (!dev) { |
1da177e4 LT |
509 | err("Out of memory"); |
510 | goto error; | |
511 | } | |
1da177e4 | 512 | kref_init(&dev->kref); |
ff906518 | 513 | sema_init(&dev->limit_sem, WRITES_IN_FLIGHT); |
121e287c | 514 | mutex_init(&dev->io_mutex); |
403dfb58 ON |
515 | spin_lock_init(&dev->err_lock); |
516 | init_usb_anchor(&dev->submitted); | |
e7389cc9 | 517 | init_completion(&dev->bulk_in_completion); |
1da177e4 LT |
518 | |
519 | dev->udev = usb_get_dev(interface_to_usbdev(interface)); | |
520 | dev->interface = interface; | |
521 | ||
522 | /* set up the endpoint information */ | |
523 | /* use only the first bulk-in and bulk-out endpoints */ | |
524 | iface_desc = interface->cur_altsetting; | |
525 | for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { | |
526 | endpoint = &iface_desc->endpoint[i].desc; | |
527 | ||
528 | if (!dev->bulk_in_endpointAddr && | |
c0704541 | 529 | usb_endpoint_is_bulk_in(endpoint)) { |
1da177e4 LT |
530 | /* we found a bulk in endpoint */ |
531 | buffer_size = le16_to_cpu(endpoint->wMaxPacketSize); | |
532 | dev->bulk_in_size = buffer_size; | |
533 | dev->bulk_in_endpointAddr = endpoint->bEndpointAddress; | |
534 | dev->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL); | |
535 | if (!dev->bulk_in_buffer) { | |
536 | err("Could not allocate bulk_in_buffer"); | |
537 | goto error; | |
538 | } | |
e7389cc9 ON |
539 | dev->bulk_in_urb = usb_alloc_urb(0, GFP_KERNEL); |
540 | if (!dev->bulk_in_urb) { | |
541 | err("Could not allocate bulk_in_urb"); | |
542 | goto error; | |
543 | } | |
1da177e4 LT |
544 | } |
545 | ||
546 | if (!dev->bulk_out_endpointAddr && | |
c0704541 | 547 | usb_endpoint_is_bulk_out(endpoint)) { |
1da177e4 LT |
548 | /* we found a bulk out endpoint */ |
549 | dev->bulk_out_endpointAddr = endpoint->bEndpointAddress; | |
550 | } | |
551 | } | |
552 | if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) { | |
553 | err("Could not find both bulk-in and bulk-out endpoints"); | |
554 | goto error; | |
555 | } | |
556 | ||
557 | /* save our data pointer in this interface device */ | |
558 | usb_set_intfdata(interface, dev); | |
559 | ||
560 | /* we can register the device now, as it is ready */ | |
561 | retval = usb_register_dev(interface, &skel_class); | |
562 | if (retval) { | |
563 | /* something prevented us from registering this driver */ | |
564 | err("Not able to get a minor for this device."); | |
565 | usb_set_intfdata(interface, NULL); | |
566 | goto error; | |
567 | } | |
568 | ||
569 | /* let the user know what node this device is now attached to */ | |
a5f5ea23 MK |
570 | dev_info(&interface->dev, |
571 | "USB Skeleton device now attached to USBSkel-%d", | |
572 | interface->minor); | |
1da177e4 LT |
573 | return 0; |
574 | ||
575 | error: | |
576 | if (dev) | |
ba35e02b | 577 | /* this frees allocated memory */ |
1da177e4 LT |
578 | kref_put(&dev->kref, skel_delete); |
579 | return retval; | |
580 | } | |
581 | ||
582 | static void skel_disconnect(struct usb_interface *interface) | |
583 | { | |
584 | struct usb_skel *dev; | |
585 | int minor = interface->minor; | |
586 | ||
1da177e4 LT |
587 | dev = usb_get_intfdata(interface); |
588 | usb_set_intfdata(interface, NULL); | |
589 | ||
590 | /* give back our minor */ | |
591 | usb_deregister_dev(interface, &skel_class); | |
592 | ||
121e287c AS |
593 | /* prevent more I/O from starting */ |
594 | mutex_lock(&dev->io_mutex); | |
595 | dev->interface = NULL; | |
596 | mutex_unlock(&dev->io_mutex); | |
597 | ||
e73c7247 ON |
598 | usb_kill_anchored_urbs(&dev->submitted); |
599 | ||
1da177e4 LT |
600 | /* decrement our usage count */ |
601 | kref_put(&dev->kref, skel_delete); | |
602 | ||
a5f5ea23 | 603 | dev_info(&interface->dev, "USB Skeleton #%d now disconnected", minor); |
1da177e4 LT |
604 | } |
605 | ||
403dfb58 ON |
606 | static void skel_draw_down(struct usb_skel *dev) |
607 | { | |
608 | int time; | |
609 | ||
610 | time = usb_wait_anchor_empty_timeout(&dev->submitted, 1000); | |
611 | if (!time) | |
612 | usb_kill_anchored_urbs(&dev->submitted); | |
e7389cc9 | 613 | usb_kill_urb(dev->bulk_in_urb); |
403dfb58 ON |
614 | } |
615 | ||
758f7e16 ON |
616 | static int skel_suspend(struct usb_interface *intf, pm_message_t message) |
617 | { | |
618 | struct usb_skel *dev = usb_get_intfdata(intf); | |
619 | ||
620 | if (!dev) | |
621 | return 0; | |
622 | skel_draw_down(dev); | |
623 | return 0; | |
624 | } | |
625 | ||
626 | static int skel_resume (struct usb_interface *intf) | |
627 | { | |
628 | return 0; | |
629 | } | |
630 | ||
87d093e2 ON |
631 | static int skel_pre_reset(struct usb_interface *intf) |
632 | { | |
633 | struct usb_skel *dev = usb_get_intfdata(intf); | |
634 | ||
635 | mutex_lock(&dev->io_mutex); | |
636 | skel_draw_down(dev); | |
637 | ||
638 | return 0; | |
639 | } | |
640 | ||
641 | static int skel_post_reset(struct usb_interface *intf) | |
642 | { | |
643 | struct usb_skel *dev = usb_get_intfdata(intf); | |
644 | ||
645 | /* we are sure no URBs are active - no locking needed */ | |
646 | dev->errors = -EPIPE; | |
647 | mutex_unlock(&dev->io_mutex); | |
648 | ||
649 | return 0; | |
650 | } | |
651 | ||
1da177e4 | 652 | static struct usb_driver skel_driver = { |
1da177e4 LT |
653 | .name = "skeleton", |
654 | .probe = skel_probe, | |
655 | .disconnect = skel_disconnect, | |
758f7e16 ON |
656 | .suspend = skel_suspend, |
657 | .resume = skel_resume, | |
87d093e2 ON |
658 | .pre_reset = skel_pre_reset, |
659 | .post_reset = skel_post_reset, | |
1da177e4 | 660 | .id_table = skel_table, |
ba35e02b | 661 | .supports_autosuspend = 1, |
1da177e4 LT |
662 | }; |
663 | ||
664 | static int __init usb_skel_init(void) | |
665 | { | |
666 | int result; | |
667 | ||
668 | /* register this driver with the USB subsystem */ | |
669 | result = usb_register(&skel_driver); | |
670 | if (result) | |
671 | err("usb_register failed. Error number %d", result); | |
672 | ||
673 | return result; | |
674 | } | |
675 | ||
676 | static void __exit usb_skel_exit(void) | |
677 | { | |
678 | /* deregister this driver with the USB subsystem */ | |
679 | usb_deregister(&skel_driver); | |
680 | } | |
681 | ||
c0704541 LFC |
682 | module_init(usb_skel_init); |
683 | module_exit(usb_skel_exit); | |
1da177e4 LT |
684 | |
685 | MODULE_LICENSE("GPL"); |