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 */ |
c79041a4 | 66 | wait_queue_head_t bulk_in_wait; /* to wait for an ongoing read */ |
1da177e4 LT |
67 | }; |
68 | #define to_skel_dev(d) container_of(d, struct usb_skel, kref) | |
69 | ||
70 | static struct usb_driver skel_driver; | |
403dfb58 | 71 | static void skel_draw_down(struct usb_skel *dev); |
1da177e4 LT |
72 | |
73 | static void skel_delete(struct kref *kref) | |
c0704541 | 74 | { |
1da177e4 LT |
75 | struct usb_skel *dev = to_skel_dev(kref); |
76 | ||
e7389cc9 | 77 | usb_free_urb(dev->bulk_in_urb); |
1da177e4 | 78 | usb_put_dev(dev->udev); |
c0704541 LFC |
79 | kfree(dev->bulk_in_buffer); |
80 | kfree(dev); | |
1da177e4 LT |
81 | } |
82 | ||
83 | static int skel_open(struct inode *inode, struct file *file) | |
84 | { | |
85 | struct usb_skel *dev; | |
86 | struct usb_interface *interface; | |
87 | int subminor; | |
88 | int retval = 0; | |
89 | ||
90 | subminor = iminor(inode); | |
91 | ||
92 | interface = usb_find_interface(&skel_driver, subminor); | |
93 | if (!interface) { | |
4212cd74 GKH |
94 | pr_err("%s - error, can't find device for minor %d\n", |
95 | __func__, subminor); | |
1da177e4 LT |
96 | retval = -ENODEV; |
97 | goto exit; | |
98 | } | |
99 | ||
100 | dev = usb_get_intfdata(interface); | |
101 | if (!dev) { | |
102 | retval = -ENODEV; | |
103 | goto exit; | |
104 | } | |
105 | ||
e28dbb06 ML |
106 | retval = usb_autopm_get_interface(interface); |
107 | if (retval) | |
e8cebb9c CS |
108 | goto exit; |
109 | ||
110 | /* increment our usage count for the device */ | |
111 | kref_get(&dev->kref); | |
1da177e4 LT |
112 | |
113 | /* save our object in the file's private structure */ | |
114 | file->private_data = dev; | |
115 | ||
116 | exit: | |
117 | return retval; | |
118 | } | |
119 | ||
120 | static int skel_release(struct inode *inode, struct file *file) | |
121 | { | |
122 | struct usb_skel *dev; | |
123 | ||
e53e841d | 124 | dev = file->private_data; |
1da177e4 LT |
125 | if (dev == NULL) |
126 | return -ENODEV; | |
127 | ||
01d883d4 AS |
128 | /* allow the device to be autosuspended */ |
129 | mutex_lock(&dev->io_mutex); | |
e28dbb06 | 130 | if (dev->interface) |
01d883d4 AS |
131 | usb_autopm_put_interface(dev->interface); |
132 | mutex_unlock(&dev->io_mutex); | |
133 | ||
1da177e4 LT |
134 | /* decrement the count on our device */ |
135 | kref_put(&dev->kref, skel_delete); | |
136 | return 0; | |
137 | } | |
138 | ||
403dfb58 ON |
139 | static int skel_flush(struct file *file, fl_owner_t id) |
140 | { | |
141 | struct usb_skel *dev; | |
142 | int res; | |
143 | ||
e53e841d | 144 | dev = file->private_data; |
403dfb58 ON |
145 | if (dev == NULL) |
146 | return -ENODEV; | |
147 | ||
148 | /* wait for io to stop */ | |
149 | mutex_lock(&dev->io_mutex); | |
150 | skel_draw_down(dev); | |
151 | ||
152 | /* read out errors, leave subsequent opens a clean slate */ | |
153 | spin_lock_irq(&dev->err_lock); | |
154 | res = dev->errors ? (dev->errors == -EPIPE ? -EPIPE : -EIO) : 0; | |
155 | dev->errors = 0; | |
156 | spin_unlock_irq(&dev->err_lock); | |
157 | ||
158 | mutex_unlock(&dev->io_mutex); | |
159 | ||
160 | return res; | |
161 | } | |
162 | ||
e7389cc9 ON |
163 | static void skel_read_bulk_callback(struct urb *urb) |
164 | { | |
165 | struct usb_skel *dev; | |
166 | ||
167 | dev = urb->context; | |
168 | ||
169 | spin_lock(&dev->err_lock); | |
170 | /* sync/async unlink faults aren't errors */ | |
171 | if (urb->status) { | |
3ae9da1c | 172 | if (!(urb->status == -ENOENT || |
e7389cc9 ON |
173 | urb->status == -ECONNRESET || |
174 | urb->status == -ESHUTDOWN)) | |
4212cd74 GKH |
175 | dev_err(&dev->interface->dev, |
176 | "%s - nonzero write bulk status received: %d\n", | |
177 | __func__, urb->status); | |
e7389cc9 ON |
178 | |
179 | dev->errors = urb->status; | |
180 | } else { | |
181 | dev->bulk_in_filled = urb->actual_length; | |
182 | } | |
183 | dev->ongoing_read = 0; | |
184 | spin_unlock(&dev->err_lock); | |
185 | ||
c79041a4 | 186 | wake_up_interruptible(&dev->bulk_in_wait); |
e7389cc9 ON |
187 | } |
188 | ||
189 | static int skel_do_read_io(struct usb_skel *dev, size_t count) | |
190 | { | |
191 | int rv; | |
192 | ||
193 | /* prepare a read */ | |
194 | usb_fill_bulk_urb(dev->bulk_in_urb, | |
195 | dev->udev, | |
196 | usb_rcvbulkpipe(dev->udev, | |
197 | dev->bulk_in_endpointAddr), | |
198 | dev->bulk_in_buffer, | |
199 | min(dev->bulk_in_size, count), | |
200 | skel_read_bulk_callback, | |
201 | dev); | |
202 | /* tell everybody to leave the URB alone */ | |
203 | spin_lock_irq(&dev->err_lock); | |
204 | dev->ongoing_read = 1; | |
205 | spin_unlock_irq(&dev->err_lock); | |
206 | ||
c79041a4 DX |
207 | /* submit bulk in urb, which means no data to deliver */ |
208 | dev->bulk_in_filled = 0; | |
209 | dev->bulk_in_copied = 0; | |
210 | ||
e7389cc9 ON |
211 | /* do it */ |
212 | rv = usb_submit_urb(dev->bulk_in_urb, GFP_KERNEL); | |
213 | if (rv < 0) { | |
4212cd74 GKH |
214 | dev_err(&dev->interface->dev, |
215 | "%s - failed submitting read urb, error %d\n", | |
e7389cc9 | 216 | __func__, rv); |
e7389cc9 ON |
217 | rv = (rv == -ENOMEM) ? rv : -EIO; |
218 | spin_lock_irq(&dev->err_lock); | |
219 | dev->ongoing_read = 0; | |
220 | spin_unlock_irq(&dev->err_lock); | |
221 | } | |
222 | ||
223 | return rv; | |
224 | } | |
225 | ||
3ae9da1c GKH |
226 | static ssize_t skel_read(struct file *file, char *buffer, size_t count, |
227 | loff_t *ppos) | |
1da177e4 LT |
228 | { |
229 | struct usb_skel *dev; | |
e7389cc9 ON |
230 | int rv; |
231 | bool ongoing_io; | |
1da177e4 | 232 | |
e53e841d | 233 | dev = file->private_data; |
121e287c | 234 | |
e7389cc9 ON |
235 | /* if we cannot read at all, return EOF */ |
236 | if (!dev->bulk_in_urb || !count) | |
237 | return 0; | |
238 | ||
239 | /* no concurrent readers */ | |
240 | rv = mutex_lock_interruptible(&dev->io_mutex); | |
241 | if (rv < 0) | |
242 | return rv; | |
243 | ||
121e287c | 244 | if (!dev->interface) { /* disconnect() was called */ |
e7389cc9 | 245 | rv = -ENODEV; |
121e287c AS |
246 | goto exit; |
247 | } | |
248 | ||
e7389cc9 ON |
249 | /* if IO is under way, we must not touch things */ |
250 | retry: | |
251 | spin_lock_irq(&dev->err_lock); | |
252 | ongoing_io = dev->ongoing_read; | |
253 | spin_unlock_irq(&dev->err_lock); | |
254 | ||
255 | if (ongoing_io) { | |
8cd01664 ON |
256 | /* nonblocking IO shall not wait */ |
257 | if (file->f_flags & O_NONBLOCK) { | |
258 | rv = -EAGAIN; | |
259 | goto exit; | |
260 | } | |
e7389cc9 ON |
261 | /* |
262 | * IO may take forever | |
263 | * hence wait in an interruptible state | |
264 | */ | |
c79041a4 | 265 | rv = wait_event_interruptible(dev->bulk_in_wait, (!dev->ongoing_read)); |
e7389cc9 ON |
266 | if (rv < 0) |
267 | goto exit; | |
1da177e4 LT |
268 | } |
269 | ||
e7389cc9 | 270 | /* errors must be reported */ |
3ae9da1c GKH |
271 | rv = dev->errors; |
272 | if (rv < 0) { | |
e7389cc9 ON |
273 | /* any error is reported once */ |
274 | dev->errors = 0; | |
275 | /* to preserve notifications about reset */ | |
276 | rv = (rv == -EPIPE) ? rv : -EIO; | |
e7389cc9 ON |
277 | /* report it */ |
278 | goto exit; | |
279 | } | |
280 | ||
281 | /* | |
282 | * if the buffer is filled we may satisfy the read | |
283 | * else we need to start IO | |
284 | */ | |
285 | ||
286 | if (dev->bulk_in_filled) { | |
287 | /* we had read data */ | |
288 | size_t available = dev->bulk_in_filled - dev->bulk_in_copied; | |
289 | size_t chunk = min(available, count); | |
290 | ||
291 | if (!available) { | |
292 | /* | |
293 | * all data has been used | |
294 | * actual IO needs to be done | |
295 | */ | |
296 | rv = skel_do_read_io(dev, count); | |
297 | if (rv < 0) | |
298 | goto exit; | |
299 | else | |
300 | goto retry; | |
301 | } | |
302 | /* | |
303 | * data is available | |
304 | * chunk tells us how much shall be copied | |
305 | */ | |
306 | ||
307 | if (copy_to_user(buffer, | |
308 | dev->bulk_in_buffer + dev->bulk_in_copied, | |
309 | chunk)) | |
310 | rv = -EFAULT; | |
311 | else | |
312 | rv = chunk; | |
313 | ||
314 | dev->bulk_in_copied += chunk; | |
315 | ||
316 | /* | |
317 | * if we are asked for more than we have, | |
318 | * we start IO but don't wait | |
319 | */ | |
320 | if (available < count) | |
321 | skel_do_read_io(dev, count - chunk); | |
322 | } else { | |
323 | /* no data in the buffer */ | |
324 | rv = skel_do_read_io(dev, count); | |
325 | if (rv < 0) | |
326 | goto exit; | |
140983c2 | 327 | else |
e7389cc9 ON |
328 | goto retry; |
329 | } | |
121e287c AS |
330 | exit: |
331 | mutex_unlock(&dev->io_mutex); | |
e7389cc9 | 332 | return rv; |
1da177e4 LT |
333 | } |
334 | ||
7d12e780 | 335 | static void skel_write_bulk_callback(struct urb *urb) |
1da177e4 LT |
336 | { |
337 | struct usb_skel *dev; | |
338 | ||
cdc97792 | 339 | dev = urb->context; |
1da177e4 LT |
340 | |
341 | /* sync/async unlink faults aren't errors */ | |
403dfb58 | 342 | if (urb->status) { |
3ae9da1c | 343 | if (!(urb->status == -ENOENT || |
403dfb58 ON |
344 | urb->status == -ECONNRESET || |
345 | urb->status == -ESHUTDOWN)) | |
4212cd74 GKH |
346 | dev_err(&dev->interface->dev, |
347 | "%s - nonzero write bulk status received: %d\n", | |
348 | __func__, urb->status); | |
403dfb58 ON |
349 | |
350 | spin_lock(&dev->err_lock); | |
351 | dev->errors = urb->status; | |
352 | spin_unlock(&dev->err_lock); | |
1da177e4 LT |
353 | } |
354 | ||
355 | /* free up our allocated buffer */ | |
997ea58e DM |
356 | usb_free_coherent(urb->dev, urb->transfer_buffer_length, |
357 | urb->transfer_buffer, urb->transfer_dma); | |
ff906518 | 358 | up(&dev->limit_sem); |
1da177e4 LT |
359 | } |
360 | ||
3ae9da1c GKH |
361 | static ssize_t skel_write(struct file *file, const char *user_buffer, |
362 | size_t count, loff_t *ppos) | |
1da177e4 LT |
363 | { |
364 | struct usb_skel *dev; | |
365 | int retval = 0; | |
366 | struct urb *urb = NULL; | |
367 | char *buf = NULL; | |
c8dd7709 | 368 | size_t writesize = min(count, (size_t)MAX_TRANSFER); |
1da177e4 | 369 | |
e53e841d | 370 | dev = file->private_data; |
1da177e4 LT |
371 | |
372 | /* verify that we actually have some data to write */ | |
373 | if (count == 0) | |
374 | goto exit; | |
375 | ||
3ae9da1c GKH |
376 | /* |
377 | * limit the number of URBs in flight to stop a user from using up all | |
378 | * RAM | |
379 | */ | |
4de84057 | 380 | if (!(file->f_flags & O_NONBLOCK)) { |
79819986 ON |
381 | if (down_interruptible(&dev->limit_sem)) { |
382 | retval = -ERESTARTSYS; | |
383 | goto exit; | |
384 | } | |
385 | } else { | |
386 | if (down_trylock(&dev->limit_sem)) { | |
387 | retval = -EAGAIN; | |
388 | goto exit; | |
389 | } | |
c8dd7709 | 390 | } |
ff906518 | 391 | |
403dfb58 | 392 | spin_lock_irq(&dev->err_lock); |
3ae9da1c GKH |
393 | retval = dev->errors; |
394 | if (retval < 0) { | |
403dfb58 ON |
395 | /* any error is reported once */ |
396 | dev->errors = 0; | |
397 | /* to preserve notifications about reset */ | |
398 | retval = (retval == -EPIPE) ? retval : -EIO; | |
399 | } | |
400 | spin_unlock_irq(&dev->err_lock); | |
401 | if (retval < 0) | |
402 | goto error; | |
403 | ||
1da177e4 LT |
404 | /* create a urb, and a buffer for it, and copy the data to the urb */ |
405 | urb = usb_alloc_urb(0, GFP_KERNEL); | |
406 | if (!urb) { | |
407 | retval = -ENOMEM; | |
408 | goto error; | |
409 | } | |
410 | ||
997ea58e DM |
411 | buf = usb_alloc_coherent(dev->udev, writesize, GFP_KERNEL, |
412 | &urb->transfer_dma); | |
1da177e4 LT |
413 | if (!buf) { |
414 | retval = -ENOMEM; | |
415 | goto error; | |
416 | } | |
417 | ||
ff906518 | 418 | if (copy_from_user(buf, user_buffer, writesize)) { |
1da177e4 LT |
419 | retval = -EFAULT; |
420 | goto error; | |
421 | } | |
422 | ||
ba35e02b ON |
423 | /* this lock makes sure we don't submit URBs to gone devices */ |
424 | mutex_lock(&dev->io_mutex); | |
425 | if (!dev->interface) { /* disconnect() was called */ | |
426 | mutex_unlock(&dev->io_mutex); | |
427 | retval = -ENODEV; | |
428 | goto error; | |
429 | } | |
430 | ||
1da177e4 LT |
431 | /* initialize the urb properly */ |
432 | usb_fill_bulk_urb(urb, dev->udev, | |
433 | usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr), | |
ff906518 | 434 | buf, writesize, skel_write_bulk_callback, dev); |
1da177e4 | 435 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
403dfb58 | 436 | usb_anchor_urb(urb, &dev->submitted); |
1da177e4 LT |
437 | |
438 | /* send the data out the bulk port */ | |
439 | retval = usb_submit_urb(urb, GFP_KERNEL); | |
ba35e02b | 440 | mutex_unlock(&dev->io_mutex); |
1da177e4 | 441 | if (retval) { |
4212cd74 GKH |
442 | dev_err(&dev->interface->dev, |
443 | "%s - failed submitting write urb, error %d\n", | |
444 | __func__, retval); | |
403dfb58 | 445 | goto error_unanchor; |
1da177e4 LT |
446 | } |
447 | ||
3ae9da1c GKH |
448 | /* |
449 | * release our reference to this urb, the USB core will eventually free | |
450 | * it entirely | |
451 | */ | |
1da177e4 LT |
452 | usb_free_urb(urb); |
453 | ||
ba35e02b | 454 | |
ff906518 | 455 | return writesize; |
1da177e4 | 456 | |
403dfb58 ON |
457 | error_unanchor: |
458 | usb_unanchor_urb(urb); | |
1da177e4 | 459 | error: |
121e287c | 460 | if (urb) { |
997ea58e | 461 | usb_free_coherent(dev->udev, writesize, buf, urb->transfer_dma); |
121e287c AS |
462 | usb_free_urb(urb); |
463 | } | |
ff906518 | 464 | up(&dev->limit_sem); |
121e287c AS |
465 | |
466 | exit: | |
1da177e4 LT |
467 | return retval; |
468 | } | |
469 | ||
066202dd | 470 | static const struct file_operations skel_fops = { |
1da177e4 LT |
471 | .owner = THIS_MODULE, |
472 | .read = skel_read, | |
473 | .write = skel_write, | |
474 | .open = skel_open, | |
475 | .release = skel_release, | |
403dfb58 | 476 | .flush = skel_flush, |
6038f373 | 477 | .llseek = noop_llseek, |
1da177e4 LT |
478 | }; |
479 | ||
c0704541 | 480 | /* |
1da177e4 | 481 | * usb class driver info in order to get a minor number from the usb core, |
595b14cb | 482 | * and to have the device registered with the driver core |
1da177e4 LT |
483 | */ |
484 | static struct usb_class_driver skel_class = { | |
d6e5bcf4 | 485 | .name = "skel%d", |
1da177e4 | 486 | .fops = &skel_fops, |
1da177e4 LT |
487 | .minor_base = USB_SKEL_MINOR_BASE, |
488 | }; | |
489 | ||
3ae9da1c GKH |
490 | static int skel_probe(struct usb_interface *interface, |
491 | const struct usb_device_id *id) | |
1da177e4 | 492 | { |
c0704541 | 493 | struct usb_skel *dev; |
1da177e4 LT |
494 | struct usb_host_interface *iface_desc; |
495 | struct usb_endpoint_descriptor *endpoint; | |
496 | size_t buffer_size; | |
497 | int i; | |
498 | int retval = -ENOMEM; | |
499 | ||
500 | /* allocate memory for our device state and initialize it */ | |
ff906518 | 501 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
c0704541 | 502 | if (!dev) { |
4212cd74 | 503 | dev_err(&interface->dev, "Out of memory\n"); |
1da177e4 LT |
504 | goto error; |
505 | } | |
1da177e4 | 506 | kref_init(&dev->kref); |
ff906518 | 507 | sema_init(&dev->limit_sem, WRITES_IN_FLIGHT); |
121e287c | 508 | mutex_init(&dev->io_mutex); |
403dfb58 ON |
509 | spin_lock_init(&dev->err_lock); |
510 | init_usb_anchor(&dev->submitted); | |
c79041a4 | 511 | init_waitqueue_head(&dev->bulk_in_wait); |
1da177e4 LT |
512 | |
513 | dev->udev = usb_get_dev(interface_to_usbdev(interface)); | |
514 | dev->interface = interface; | |
515 | ||
516 | /* set up the endpoint information */ | |
517 | /* use only the first bulk-in and bulk-out endpoints */ | |
518 | iface_desc = interface->cur_altsetting; | |
519 | for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { | |
520 | endpoint = &iface_desc->endpoint[i].desc; | |
521 | ||
522 | if (!dev->bulk_in_endpointAddr && | |
c0704541 | 523 | usb_endpoint_is_bulk_in(endpoint)) { |
1da177e4 | 524 | /* we found a bulk in endpoint */ |
29cc8897 | 525 | buffer_size = usb_endpoint_maxp(endpoint); |
1da177e4 LT |
526 | dev->bulk_in_size = buffer_size; |
527 | dev->bulk_in_endpointAddr = endpoint->bEndpointAddress; | |
528 | dev->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL); | |
529 | if (!dev->bulk_in_buffer) { | |
4212cd74 GKH |
530 | dev_err(&interface->dev, |
531 | "Could not allocate bulk_in_buffer\n"); | |
1da177e4 LT |
532 | goto error; |
533 | } | |
e7389cc9 ON |
534 | dev->bulk_in_urb = usb_alloc_urb(0, GFP_KERNEL); |
535 | if (!dev->bulk_in_urb) { | |
4212cd74 GKH |
536 | dev_err(&interface->dev, |
537 | "Could not allocate bulk_in_urb\n"); | |
e7389cc9 ON |
538 | goto error; |
539 | } | |
1da177e4 LT |
540 | } |
541 | ||
542 | if (!dev->bulk_out_endpointAddr && | |
c0704541 | 543 | usb_endpoint_is_bulk_out(endpoint)) { |
1da177e4 LT |
544 | /* we found a bulk out endpoint */ |
545 | dev->bulk_out_endpointAddr = endpoint->bEndpointAddress; | |
546 | } | |
547 | } | |
548 | if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) { | |
4212cd74 GKH |
549 | dev_err(&interface->dev, |
550 | "Could not find both bulk-in and bulk-out endpoints\n"); | |
1da177e4 LT |
551 | goto error; |
552 | } | |
553 | ||
554 | /* save our data pointer in this interface device */ | |
555 | usb_set_intfdata(interface, dev); | |
556 | ||
557 | /* we can register the device now, as it is ready */ | |
558 | retval = usb_register_dev(interface, &skel_class); | |
559 | if (retval) { | |
560 | /* something prevented us from registering this driver */ | |
4212cd74 GKH |
561 | dev_err(&interface->dev, |
562 | "Not able to get a minor for this device.\n"); | |
1da177e4 LT |
563 | usb_set_intfdata(interface, NULL); |
564 | goto error; | |
565 | } | |
566 | ||
567 | /* let the user know what node this device is now attached to */ | |
a5f5ea23 MK |
568 | dev_info(&interface->dev, |
569 | "USB Skeleton device now attached to USBSkel-%d", | |
570 | interface->minor); | |
1da177e4 LT |
571 | return 0; |
572 | ||
573 | error: | |
574 | if (dev) | |
ba35e02b | 575 | /* this frees allocated memory */ |
1da177e4 LT |
576 | kref_put(&dev->kref, skel_delete); |
577 | return retval; | |
578 | } | |
579 | ||
580 | static void skel_disconnect(struct usb_interface *interface) | |
581 | { | |
582 | struct usb_skel *dev; | |
583 | int minor = interface->minor; | |
584 | ||
1da177e4 | 585 | dev = usb_get_intfdata(interface); |
52a74999 | 586 | usb_set_intfdata(interface, NULL); |
1da177e4 LT |
587 | |
588 | /* give back our minor */ | |
589 | usb_deregister_dev(interface, &skel_class); | |
590 | ||
121e287c AS |
591 | /* prevent more I/O from starting */ |
592 | mutex_lock(&dev->io_mutex); | |
593 | dev->interface = NULL; | |
594 | mutex_unlock(&dev->io_mutex); | |
595 | ||
e73c7247 ON |
596 | usb_kill_anchored_urbs(&dev->submitted); |
597 | ||
1da177e4 LT |
598 | /* decrement our usage count */ |
599 | kref_put(&dev->kref, skel_delete); | |
600 | ||
a5f5ea23 | 601 | dev_info(&interface->dev, "USB Skeleton #%d now disconnected", minor); |
1da177e4 LT |
602 | } |
603 | ||
403dfb58 ON |
604 | static void skel_draw_down(struct usb_skel *dev) |
605 | { | |
606 | int time; | |
607 | ||
608 | time = usb_wait_anchor_empty_timeout(&dev->submitted, 1000); | |
609 | if (!time) | |
610 | usb_kill_anchored_urbs(&dev->submitted); | |
e7389cc9 | 611 | usb_kill_urb(dev->bulk_in_urb); |
403dfb58 ON |
612 | } |
613 | ||
758f7e16 ON |
614 | static int skel_suspend(struct usb_interface *intf, pm_message_t message) |
615 | { | |
616 | struct usb_skel *dev = usb_get_intfdata(intf); | |
617 | ||
618 | if (!dev) | |
619 | return 0; | |
620 | skel_draw_down(dev); | |
621 | return 0; | |
622 | } | |
623 | ||
3ae9da1c | 624 | static int skel_resume(struct usb_interface *intf) |
758f7e16 ON |
625 | { |
626 | return 0; | |
627 | } | |
628 | ||
87d093e2 ON |
629 | static int skel_pre_reset(struct usb_interface *intf) |
630 | { | |
631 | struct usb_skel *dev = usb_get_intfdata(intf); | |
632 | ||
633 | mutex_lock(&dev->io_mutex); | |
634 | skel_draw_down(dev); | |
635 | ||
636 | return 0; | |
637 | } | |
638 | ||
639 | static int skel_post_reset(struct usb_interface *intf) | |
640 | { | |
641 | struct usb_skel *dev = usb_get_intfdata(intf); | |
642 | ||
643 | /* we are sure no URBs are active - no locking needed */ | |
644 | dev->errors = -EPIPE; | |
645 | mutex_unlock(&dev->io_mutex); | |
646 | ||
647 | return 0; | |
648 | } | |
649 | ||
1da177e4 | 650 | static struct usb_driver skel_driver = { |
1da177e4 LT |
651 | .name = "skeleton", |
652 | .probe = skel_probe, | |
653 | .disconnect = skel_disconnect, | |
758f7e16 ON |
654 | .suspend = skel_suspend, |
655 | .resume = skel_resume, | |
87d093e2 ON |
656 | .pre_reset = skel_pre_reset, |
657 | .post_reset = skel_post_reset, | |
1da177e4 | 658 | .id_table = skel_table, |
ba35e02b | 659 | .supports_autosuspend = 1, |
1da177e4 LT |
660 | }; |
661 | ||
65db4305 | 662 | module_usb_driver(skel_driver); |
1da177e4 LT |
663 | |
664 | MODULE_LICENSE("GPL"); |