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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> | |
1da177e4 LT |
17 | #include <linux/slab.h> |
18 | #include <linux/module.h> | |
19 | #include <linux/kref.h> | |
3ae9da1c | 20 | #include <linux/uaccess.h> |
1da177e4 | 21 | #include <linux/usb.h> |
121e287c | 22 | #include <linux/mutex.h> |
1da177e4 LT |
23 | |
24 | ||
25 | /* Define these values to match your devices */ | |
26 | #define USB_SKEL_VENDOR_ID 0xfff0 | |
27 | #define USB_SKEL_PRODUCT_ID 0xfff0 | |
28 | ||
29 | /* table of devices that work with this driver */ | |
1bd4f29d | 30 | static const struct usb_device_id skel_table[] = { |
1da177e4 LT |
31 | { USB_DEVICE(USB_SKEL_VENDOR_ID, USB_SKEL_PRODUCT_ID) }, |
32 | { } /* Terminating entry */ | |
33 | }; | |
c0704541 | 34 | MODULE_DEVICE_TABLE(usb, skel_table); |
1da177e4 LT |
35 | |
36 | ||
37 | /* Get a minor range for your devices from the usb maintainer */ | |
38 | #define USB_SKEL_MINOR_BASE 192 | |
39 | ||
ff906518 | 40 | /* our private defines. if this grows any larger, use your own .h file */ |
c0704541 | 41 | #define MAX_TRANSFER (PAGE_SIZE - 512) |
ba35e02b ON |
42 | /* MAX_TRANSFER is chosen so that the VM is not stressed by |
43 | allocations > PAGE_SIZE and the number of packets in a page | |
44 | is an integer 512 is the largest possible packet on EHCI */ | |
ff906518 | 45 | #define WRITES_IN_FLIGHT 8 |
ba35e02b | 46 | /* arbitrarily chosen */ |
ff906518 | 47 | |
1da177e4 LT |
48 | /* Structure to hold all of our device specific stuff */ |
49 | struct usb_skel { | |
ba35e02b ON |
50 | struct usb_device *udev; /* the usb device for this device */ |
51 | struct usb_interface *interface; /* the interface for this device */ | |
ff906518 | 52 | struct semaphore limit_sem; /* limiting the number of writes in progress */ |
403dfb58 | 53 | struct usb_anchor submitted; /* in case we need to retract our submissions */ |
e7389cc9 | 54 | struct urb *bulk_in_urb; /* the urb to read data with */ |
c0704541 | 55 | unsigned char *bulk_in_buffer; /* the buffer to receive data */ |
1da177e4 | 56 | size_t bulk_in_size; /* the size of the receive buffer */ |
e7389cc9 ON |
57 | size_t bulk_in_filled; /* number of bytes in the buffer */ |
58 | size_t bulk_in_copied; /* already copied to user space */ | |
1da177e4 LT |
59 | __u8 bulk_in_endpointAddr; /* the address of the bulk in endpoint */ |
60 | __u8 bulk_out_endpointAddr; /* the address of the bulk out endpoint */ | |
403dfb58 | 61 | int errors; /* the last request tanked */ |
e7389cc9 | 62 | bool ongoing_read; /* a read is going on */ |
403dfb58 | 63 | spinlock_t err_lock; /* lock for errors */ |
1da177e4 | 64 | struct kref kref; |
121e287c | 65 | struct mutex io_mutex; /* synchronize I/O with disconnect */ |
f0c675c5 | 66 | unsigned long disconnected:1; |
c79041a4 | 67 | wait_queue_head_t bulk_in_wait; /* to wait for an ongoing read */ |
1da177e4 LT |
68 | }; |
69 | #define to_skel_dev(d) container_of(d, struct usb_skel, kref) | |
70 | ||
71 | static struct usb_driver skel_driver; | |
403dfb58 | 72 | static void skel_draw_down(struct usb_skel *dev); |
1da177e4 LT |
73 | |
74 | static void skel_delete(struct kref *kref) | |
c0704541 | 75 | { |
1da177e4 LT |
76 | struct usb_skel *dev = to_skel_dev(kref); |
77 | ||
e7389cc9 | 78 | usb_free_urb(dev->bulk_in_urb); |
92f018a2 | 79 | usb_put_intf(dev->interface); |
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 | ||
e28dbb06 ML |
108 | retval = usb_autopm_get_interface(interface); |
109 | if (retval) | |
e8cebb9c CS |
110 | goto exit; |
111 | ||
112 | /* increment our usage count for the device */ | |
113 | kref_get(&dev->kref); | |
1da177e4 LT |
114 | |
115 | /* save our object in the file's private structure */ | |
116 | file->private_data = dev; | |
117 | ||
118 | exit: | |
119 | return retval; | |
120 | } | |
121 | ||
122 | static int skel_release(struct inode *inode, struct file *file) | |
123 | { | |
124 | struct usb_skel *dev; | |
125 | ||
e53e841d | 126 | dev = file->private_data; |
1da177e4 LT |
127 | if (dev == NULL) |
128 | return -ENODEV; | |
129 | ||
01d883d4 | 130 | /* allow the device to be autosuspended */ |
92f018a2 | 131 | usb_autopm_put_interface(dev->interface); |
01d883d4 | 132 | |
1da177e4 LT |
133 | /* decrement the count on our device */ |
134 | kref_put(&dev->kref, skel_delete); | |
135 | return 0; | |
136 | } | |
137 | ||
403dfb58 ON |
138 | static int skel_flush(struct file *file, fl_owner_t id) |
139 | { | |
140 | struct usb_skel *dev; | |
141 | int res; | |
142 | ||
e53e841d | 143 | dev = file->private_data; |
403dfb58 ON |
144 | if (dev == NULL) |
145 | return -ENODEV; | |
146 | ||
147 | /* wait for io to stop */ | |
148 | mutex_lock(&dev->io_mutex); | |
149 | skel_draw_down(dev); | |
150 | ||
151 | /* read out errors, leave subsequent opens a clean slate */ | |
152 | spin_lock_irq(&dev->err_lock); | |
153 | res = dev->errors ? (dev->errors == -EPIPE ? -EPIPE : -EIO) : 0; | |
154 | dev->errors = 0; | |
155 | spin_unlock_irq(&dev->err_lock); | |
156 | ||
157 | mutex_unlock(&dev->io_mutex); | |
158 | ||
159 | return res; | |
160 | } | |
161 | ||
e7389cc9 ON |
162 | static void skel_read_bulk_callback(struct urb *urb) |
163 | { | |
164 | struct usb_skel *dev; | |
165 | ||
166 | dev = urb->context; | |
167 | ||
168 | spin_lock(&dev->err_lock); | |
169 | /* sync/async unlink faults aren't errors */ | |
170 | if (urb->status) { | |
3ae9da1c | 171 | if (!(urb->status == -ENOENT || |
e7389cc9 ON |
172 | urb->status == -ECONNRESET || |
173 | urb->status == -ESHUTDOWN)) | |
4212cd74 GKH |
174 | dev_err(&dev->interface->dev, |
175 | "%s - nonzero write bulk status received: %d\n", | |
176 | __func__, urb->status); | |
e7389cc9 ON |
177 | |
178 | dev->errors = urb->status; | |
179 | } else { | |
180 | dev->bulk_in_filled = urb->actual_length; | |
181 | } | |
182 | dev->ongoing_read = 0; | |
183 | spin_unlock(&dev->err_lock); | |
184 | ||
c79041a4 | 185 | wake_up_interruptible(&dev->bulk_in_wait); |
e7389cc9 ON |
186 | } |
187 | ||
188 | static int skel_do_read_io(struct usb_skel *dev, size_t count) | |
189 | { | |
190 | int rv; | |
191 | ||
192 | /* prepare a read */ | |
193 | usb_fill_bulk_urb(dev->bulk_in_urb, | |
194 | dev->udev, | |
195 | usb_rcvbulkpipe(dev->udev, | |
196 | dev->bulk_in_endpointAddr), | |
197 | dev->bulk_in_buffer, | |
198 | min(dev->bulk_in_size, count), | |
199 | skel_read_bulk_callback, | |
200 | dev); | |
201 | /* tell everybody to leave the URB alone */ | |
202 | spin_lock_irq(&dev->err_lock); | |
203 | dev->ongoing_read = 1; | |
204 | spin_unlock_irq(&dev->err_lock); | |
205 | ||
c79041a4 DX |
206 | /* submit bulk in urb, which means no data to deliver */ |
207 | dev->bulk_in_filled = 0; | |
208 | dev->bulk_in_copied = 0; | |
209 | ||
e7389cc9 ON |
210 | /* do it */ |
211 | rv = usb_submit_urb(dev->bulk_in_urb, GFP_KERNEL); | |
212 | if (rv < 0) { | |
4212cd74 GKH |
213 | dev_err(&dev->interface->dev, |
214 | "%s - failed submitting read urb, error %d\n", | |
e7389cc9 | 215 | __func__, rv); |
e7389cc9 ON |
216 | rv = (rv == -ENOMEM) ? rv : -EIO; |
217 | spin_lock_irq(&dev->err_lock); | |
218 | dev->ongoing_read = 0; | |
219 | spin_unlock_irq(&dev->err_lock); | |
220 | } | |
221 | ||
222 | return rv; | |
223 | } | |
224 | ||
3ae9da1c GKH |
225 | static ssize_t skel_read(struct file *file, char *buffer, size_t count, |
226 | loff_t *ppos) | |
1da177e4 LT |
227 | { |
228 | struct usb_skel *dev; | |
e7389cc9 ON |
229 | int rv; |
230 | bool ongoing_io; | |
1da177e4 | 231 | |
e53e841d | 232 | dev = file->private_data; |
121e287c | 233 | |
e7389cc9 ON |
234 | /* if we cannot read at all, return EOF */ |
235 | if (!dev->bulk_in_urb || !count) | |
236 | return 0; | |
237 | ||
238 | /* no concurrent readers */ | |
239 | rv = mutex_lock_interruptible(&dev->io_mutex); | |
240 | if (rv < 0) | |
241 | return rv; | |
242 | ||
f0c675c5 | 243 | if (dev->disconnected) { /* disconnect() was called */ |
e7389cc9 | 244 | rv = -ENODEV; |
121e287c AS |
245 | goto exit; |
246 | } | |
247 | ||
e7389cc9 ON |
248 | /* if IO is under way, we must not touch things */ |
249 | retry: | |
250 | spin_lock_irq(&dev->err_lock); | |
251 | ongoing_io = dev->ongoing_read; | |
252 | spin_unlock_irq(&dev->err_lock); | |
253 | ||
254 | if (ongoing_io) { | |
8cd01664 ON |
255 | /* nonblocking IO shall not wait */ |
256 | if (file->f_flags & O_NONBLOCK) { | |
257 | rv = -EAGAIN; | |
258 | goto exit; | |
259 | } | |
e7389cc9 ON |
260 | /* |
261 | * IO may take forever | |
262 | * hence wait in an interruptible state | |
263 | */ | |
c79041a4 | 264 | rv = wait_event_interruptible(dev->bulk_in_wait, (!dev->ongoing_read)); |
e7389cc9 ON |
265 | if (rv < 0) |
266 | goto exit; | |
1da177e4 LT |
267 | } |
268 | ||
e7389cc9 | 269 | /* errors must be reported */ |
3ae9da1c GKH |
270 | rv = dev->errors; |
271 | if (rv < 0) { | |
e7389cc9 ON |
272 | /* any error is reported once */ |
273 | dev->errors = 0; | |
274 | /* to preserve notifications about reset */ | |
275 | rv = (rv == -EPIPE) ? rv : -EIO; | |
e7389cc9 ON |
276 | /* report it */ |
277 | goto exit; | |
278 | } | |
279 | ||
280 | /* | |
281 | * if the buffer is filled we may satisfy the read | |
282 | * else we need to start IO | |
283 | */ | |
284 | ||
285 | if (dev->bulk_in_filled) { | |
286 | /* we had read data */ | |
287 | size_t available = dev->bulk_in_filled - dev->bulk_in_copied; | |
288 | size_t chunk = min(available, count); | |
289 | ||
290 | if (!available) { | |
291 | /* | |
292 | * all data has been used | |
293 | * actual IO needs to be done | |
294 | */ | |
295 | rv = skel_do_read_io(dev, count); | |
296 | if (rv < 0) | |
297 | goto exit; | |
298 | else | |
299 | goto retry; | |
300 | } | |
301 | /* | |
302 | * data is available | |
303 | * chunk tells us how much shall be copied | |
304 | */ | |
305 | ||
306 | if (copy_to_user(buffer, | |
307 | dev->bulk_in_buffer + dev->bulk_in_copied, | |
308 | chunk)) | |
309 | rv = -EFAULT; | |
310 | else | |
311 | rv = chunk; | |
312 | ||
313 | dev->bulk_in_copied += chunk; | |
314 | ||
315 | /* | |
316 | * if we are asked for more than we have, | |
317 | * we start IO but don't wait | |
318 | */ | |
319 | if (available < count) | |
320 | skel_do_read_io(dev, count - chunk); | |
321 | } else { | |
322 | /* no data in the buffer */ | |
323 | rv = skel_do_read_io(dev, count); | |
324 | if (rv < 0) | |
325 | goto exit; | |
140983c2 | 326 | else |
e7389cc9 ON |
327 | goto retry; |
328 | } | |
121e287c AS |
329 | exit: |
330 | mutex_unlock(&dev->io_mutex); | |
e7389cc9 | 331 | return rv; |
1da177e4 LT |
332 | } |
333 | ||
7d12e780 | 334 | static void skel_write_bulk_callback(struct urb *urb) |
1da177e4 LT |
335 | { |
336 | struct usb_skel *dev; | |
337 | ||
cdc97792 | 338 | dev = urb->context; |
1da177e4 LT |
339 | |
340 | /* sync/async unlink faults aren't errors */ | |
403dfb58 | 341 | if (urb->status) { |
3ae9da1c | 342 | if (!(urb->status == -ENOENT || |
403dfb58 ON |
343 | urb->status == -ECONNRESET || |
344 | urb->status == -ESHUTDOWN)) | |
4212cd74 GKH |
345 | dev_err(&dev->interface->dev, |
346 | "%s - nonzero write bulk status received: %d\n", | |
347 | __func__, urb->status); | |
403dfb58 ON |
348 | |
349 | spin_lock(&dev->err_lock); | |
350 | dev->errors = urb->status; | |
351 | spin_unlock(&dev->err_lock); | |
1da177e4 LT |
352 | } |
353 | ||
354 | /* free up our allocated buffer */ | |
997ea58e DM |
355 | usb_free_coherent(urb->dev, urb->transfer_buffer_length, |
356 | urb->transfer_buffer, urb->transfer_dma); | |
ff906518 | 357 | up(&dev->limit_sem); |
1da177e4 LT |
358 | } |
359 | ||
3ae9da1c GKH |
360 | static ssize_t skel_write(struct file *file, const char *user_buffer, |
361 | size_t count, loff_t *ppos) | |
1da177e4 LT |
362 | { |
363 | struct usb_skel *dev; | |
364 | int retval = 0; | |
365 | struct urb *urb = NULL; | |
366 | char *buf = NULL; | |
c8dd7709 | 367 | size_t writesize = min(count, (size_t)MAX_TRANSFER); |
1da177e4 | 368 | |
e53e841d | 369 | dev = file->private_data; |
1da177e4 LT |
370 | |
371 | /* verify that we actually have some data to write */ | |
372 | if (count == 0) | |
373 | goto exit; | |
374 | ||
3ae9da1c GKH |
375 | /* |
376 | * limit the number of URBs in flight to stop a user from using up all | |
377 | * RAM | |
378 | */ | |
4de84057 | 379 | if (!(file->f_flags & O_NONBLOCK)) { |
79819986 ON |
380 | if (down_interruptible(&dev->limit_sem)) { |
381 | retval = -ERESTARTSYS; | |
382 | goto exit; | |
383 | } | |
384 | } else { | |
385 | if (down_trylock(&dev->limit_sem)) { | |
386 | retval = -EAGAIN; | |
387 | goto exit; | |
388 | } | |
c8dd7709 | 389 | } |
ff906518 | 390 | |
403dfb58 | 391 | spin_lock_irq(&dev->err_lock); |
3ae9da1c GKH |
392 | retval = dev->errors; |
393 | if (retval < 0) { | |
403dfb58 ON |
394 | /* any error is reported once */ |
395 | dev->errors = 0; | |
396 | /* to preserve notifications about reset */ | |
397 | retval = (retval == -EPIPE) ? retval : -EIO; | |
398 | } | |
399 | spin_unlock_irq(&dev->err_lock); | |
400 | if (retval < 0) | |
401 | goto error; | |
402 | ||
1da177e4 LT |
403 | /* create a urb, and a buffer for it, and copy the data to the urb */ |
404 | urb = usb_alloc_urb(0, GFP_KERNEL); | |
405 | if (!urb) { | |
406 | retval = -ENOMEM; | |
407 | goto error; | |
408 | } | |
409 | ||
997ea58e DM |
410 | buf = usb_alloc_coherent(dev->udev, writesize, GFP_KERNEL, |
411 | &urb->transfer_dma); | |
1da177e4 LT |
412 | if (!buf) { |
413 | retval = -ENOMEM; | |
414 | goto error; | |
415 | } | |
416 | ||
ff906518 | 417 | if (copy_from_user(buf, user_buffer, writesize)) { |
1da177e4 LT |
418 | retval = -EFAULT; |
419 | goto error; | |
420 | } | |
421 | ||
ba35e02b ON |
422 | /* this lock makes sure we don't submit URBs to gone devices */ |
423 | mutex_lock(&dev->io_mutex); | |
f0c675c5 | 424 | if (dev->disconnected) { /* disconnect() was called */ |
ba35e02b ON |
425 | mutex_unlock(&dev->io_mutex); |
426 | retval = -ENODEV; | |
427 | goto error; | |
428 | } | |
429 | ||
1da177e4 LT |
430 | /* initialize the urb properly */ |
431 | usb_fill_bulk_urb(urb, dev->udev, | |
432 | usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr), | |
ff906518 | 433 | buf, writesize, skel_write_bulk_callback, dev); |
1da177e4 | 434 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
403dfb58 | 435 | usb_anchor_urb(urb, &dev->submitted); |
1da177e4 LT |
436 | |
437 | /* send the data out the bulk port */ | |
438 | retval = usb_submit_urb(urb, GFP_KERNEL); | |
ba35e02b | 439 | mutex_unlock(&dev->io_mutex); |
1da177e4 | 440 | if (retval) { |
4212cd74 GKH |
441 | dev_err(&dev->interface->dev, |
442 | "%s - failed submitting write urb, error %d\n", | |
443 | __func__, retval); | |
403dfb58 | 444 | goto error_unanchor; |
1da177e4 LT |
445 | } |
446 | ||
3ae9da1c GKH |
447 | /* |
448 | * release our reference to this urb, the USB core will eventually free | |
449 | * it entirely | |
450 | */ | |
1da177e4 LT |
451 | usb_free_urb(urb); |
452 | ||
ba35e02b | 453 | |
ff906518 | 454 | return writesize; |
1da177e4 | 455 | |
403dfb58 ON |
456 | error_unanchor: |
457 | usb_unanchor_urb(urb); | |
1da177e4 | 458 | error: |
121e287c | 459 | if (urb) { |
997ea58e | 460 | usb_free_coherent(dev->udev, writesize, buf, urb->transfer_dma); |
121e287c AS |
461 | usb_free_urb(urb); |
462 | } | |
ff906518 | 463 | up(&dev->limit_sem); |
121e287c AS |
464 | |
465 | exit: | |
1da177e4 LT |
466 | return retval; |
467 | } | |
468 | ||
066202dd | 469 | static const struct file_operations skel_fops = { |
1da177e4 LT |
470 | .owner = THIS_MODULE, |
471 | .read = skel_read, | |
472 | .write = skel_write, | |
473 | .open = skel_open, | |
474 | .release = skel_release, | |
403dfb58 | 475 | .flush = skel_flush, |
6038f373 | 476 | .llseek = noop_llseek, |
1da177e4 LT |
477 | }; |
478 | ||
c0704541 | 479 | /* |
1da177e4 | 480 | * usb class driver info in order to get a minor number from the usb core, |
595b14cb | 481 | * and to have the device registered with the driver core |
1da177e4 LT |
482 | */ |
483 | static struct usb_class_driver skel_class = { | |
d6e5bcf4 | 484 | .name = "skel%d", |
1da177e4 | 485 | .fops = &skel_fops, |
1da177e4 LT |
486 | .minor_base = USB_SKEL_MINOR_BASE, |
487 | }; | |
488 | ||
3ae9da1c GKH |
489 | static int skel_probe(struct usb_interface *interface, |
490 | const struct usb_device_id *id) | |
1da177e4 | 491 | { |
c0704541 | 492 | struct usb_skel *dev; |
af59f895 JH |
493 | struct usb_endpoint_descriptor *bulk_in, *bulk_out; |
494 | int retval; | |
1da177e4 LT |
495 | |
496 | /* allocate memory for our device state and initialize it */ | |
ff906518 | 497 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
dc0c32c9 | 498 | if (!dev) |
af59f895 JH |
499 | return -ENOMEM; |
500 | ||
1da177e4 | 501 | kref_init(&dev->kref); |
ff906518 | 502 | sema_init(&dev->limit_sem, WRITES_IN_FLIGHT); |
121e287c | 503 | mutex_init(&dev->io_mutex); |
403dfb58 ON |
504 | spin_lock_init(&dev->err_lock); |
505 | init_usb_anchor(&dev->submitted); | |
c79041a4 | 506 | init_waitqueue_head(&dev->bulk_in_wait); |
1da177e4 LT |
507 | |
508 | dev->udev = usb_get_dev(interface_to_usbdev(interface)); | |
92f018a2 | 509 | dev->interface = usb_get_intf(interface); |
1da177e4 LT |
510 | |
511 | /* set up the endpoint information */ | |
512 | /* use only the first bulk-in and bulk-out endpoints */ | |
af59f895 JH |
513 | retval = usb_find_common_endpoints(interface->cur_altsetting, |
514 | &bulk_in, &bulk_out, NULL, NULL); | |
515 | if (retval) { | |
4212cd74 GKH |
516 | dev_err(&interface->dev, |
517 | "Could not find both bulk-in and bulk-out endpoints\n"); | |
1da177e4 LT |
518 | goto error; |
519 | } | |
520 | ||
af59f895 JH |
521 | dev->bulk_in_size = usb_endpoint_maxp(bulk_in); |
522 | dev->bulk_in_endpointAddr = bulk_in->bEndpointAddress; | |
523 | dev->bulk_in_buffer = kmalloc(dev->bulk_in_size, GFP_KERNEL); | |
524 | if (!dev->bulk_in_buffer) { | |
525 | retval = -ENOMEM; | |
526 | goto error; | |
527 | } | |
528 | dev->bulk_in_urb = usb_alloc_urb(0, GFP_KERNEL); | |
529 | if (!dev->bulk_in_urb) { | |
530 | retval = -ENOMEM; | |
531 | goto error; | |
532 | } | |
533 | ||
534 | dev->bulk_out_endpointAddr = bulk_out->bEndpointAddress; | |
535 | ||
1da177e4 LT |
536 | /* save our data pointer in this interface device */ |
537 | usb_set_intfdata(interface, dev); | |
538 | ||
539 | /* we can register the device now, as it is ready */ | |
540 | retval = usb_register_dev(interface, &skel_class); | |
541 | if (retval) { | |
542 | /* something prevented us from registering this driver */ | |
4212cd74 GKH |
543 | dev_err(&interface->dev, |
544 | "Not able to get a minor for this device.\n"); | |
1da177e4 LT |
545 | usb_set_intfdata(interface, NULL); |
546 | goto error; | |
547 | } | |
548 | ||
549 | /* let the user know what node this device is now attached to */ | |
a5f5ea23 MK |
550 | dev_info(&interface->dev, |
551 | "USB Skeleton device now attached to USBSkel-%d", | |
552 | interface->minor); | |
1da177e4 LT |
553 | return 0; |
554 | ||
555 | error: | |
af59f895 JH |
556 | /* this frees allocated memory */ |
557 | kref_put(&dev->kref, skel_delete); | |
558 | ||
1da177e4 LT |
559 | return retval; |
560 | } | |
561 | ||
562 | static void skel_disconnect(struct usb_interface *interface) | |
563 | { | |
564 | struct usb_skel *dev; | |
565 | int minor = interface->minor; | |
566 | ||
1da177e4 | 567 | dev = usb_get_intfdata(interface); |
52a74999 | 568 | usb_set_intfdata(interface, NULL); |
1da177e4 LT |
569 | |
570 | /* give back our minor */ | |
571 | usb_deregister_dev(interface, &skel_class); | |
572 | ||
121e287c AS |
573 | /* prevent more I/O from starting */ |
574 | mutex_lock(&dev->io_mutex); | |
f0c675c5 | 575 | dev->disconnected = 1; |
121e287c AS |
576 | mutex_unlock(&dev->io_mutex); |
577 | ||
e73c7247 ON |
578 | usb_kill_anchored_urbs(&dev->submitted); |
579 | ||
1da177e4 LT |
580 | /* decrement our usage count */ |
581 | kref_put(&dev->kref, skel_delete); | |
582 | ||
a5f5ea23 | 583 | dev_info(&interface->dev, "USB Skeleton #%d now disconnected", minor); |
1da177e4 LT |
584 | } |
585 | ||
403dfb58 ON |
586 | static void skel_draw_down(struct usb_skel *dev) |
587 | { | |
588 | int time; | |
589 | ||
590 | time = usb_wait_anchor_empty_timeout(&dev->submitted, 1000); | |
591 | if (!time) | |
592 | usb_kill_anchored_urbs(&dev->submitted); | |
e7389cc9 | 593 | usb_kill_urb(dev->bulk_in_urb); |
403dfb58 ON |
594 | } |
595 | ||
758f7e16 ON |
596 | static int skel_suspend(struct usb_interface *intf, pm_message_t message) |
597 | { | |
598 | struct usb_skel *dev = usb_get_intfdata(intf); | |
599 | ||
600 | if (!dev) | |
601 | return 0; | |
602 | skel_draw_down(dev); | |
603 | return 0; | |
604 | } | |
605 | ||
3ae9da1c | 606 | static int skel_resume(struct usb_interface *intf) |
758f7e16 ON |
607 | { |
608 | return 0; | |
609 | } | |
610 | ||
87d093e2 ON |
611 | static int skel_pre_reset(struct usb_interface *intf) |
612 | { | |
613 | struct usb_skel *dev = usb_get_intfdata(intf); | |
614 | ||
615 | mutex_lock(&dev->io_mutex); | |
616 | skel_draw_down(dev); | |
617 | ||
618 | return 0; | |
619 | } | |
620 | ||
621 | static int skel_post_reset(struct usb_interface *intf) | |
622 | { | |
623 | struct usb_skel *dev = usb_get_intfdata(intf); | |
624 | ||
625 | /* we are sure no URBs are active - no locking needed */ | |
626 | dev->errors = -EPIPE; | |
627 | mutex_unlock(&dev->io_mutex); | |
628 | ||
629 | return 0; | |
630 | } | |
631 | ||
1da177e4 | 632 | static struct usb_driver skel_driver = { |
1da177e4 LT |
633 | .name = "skeleton", |
634 | .probe = skel_probe, | |
635 | .disconnect = skel_disconnect, | |
758f7e16 ON |
636 | .suspend = skel_suspend, |
637 | .resume = skel_resume, | |
87d093e2 ON |
638 | .pre_reset = skel_pre_reset, |
639 | .post_reset = skel_post_reset, | |
1da177e4 | 640 | .id_table = skel_table, |
ba35e02b | 641 | .supports_autosuspend = 1, |
1da177e4 LT |
642 | }; |
643 | ||
65db4305 | 644 | module_usb_driver(skel_driver); |
1da177e4 LT |
645 | |
646 | MODULE_LICENSE("GPL"); |