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 | 63 | bool ongoing_read; /* a read is going on */ |
403dfb58 | 64 | spinlock_t err_lock; /* lock for errors */ |
1da177e4 | 65 | struct kref kref; |
121e287c | 66 | struct mutex io_mutex; /* synchronize I/O with disconnect */ |
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); |
1da177e4 | 79 | usb_put_dev(dev->udev); |
c0704541 LFC |
80 | kfree(dev->bulk_in_buffer); |
81 | kfree(dev); | |
1da177e4 LT |
82 | } |
83 | ||
84 | static int skel_open(struct inode *inode, struct file *file) | |
85 | { | |
86 | struct usb_skel *dev; | |
87 | struct usb_interface *interface; | |
88 | int subminor; | |
89 | int retval = 0; | |
90 | ||
91 | subminor = iminor(inode); | |
92 | ||
93 | interface = usb_find_interface(&skel_driver, subminor); | |
94 | if (!interface) { | |
4212cd74 GKH |
95 | pr_err("%s - error, can't find device for minor %d\n", |
96 | __func__, subminor); | |
1da177e4 LT |
97 | retval = -ENODEV; |
98 | goto exit; | |
99 | } | |
100 | ||
101 | dev = usb_get_intfdata(interface); | |
102 | if (!dev) { | |
103 | retval = -ENODEV; | |
104 | goto exit; | |
105 | } | |
106 | ||
e28dbb06 ML |
107 | retval = usb_autopm_get_interface(interface); |
108 | if (retval) | |
e8cebb9c CS |
109 | goto exit; |
110 | ||
111 | /* increment our usage count for the device */ | |
112 | kref_get(&dev->kref); | |
1da177e4 LT |
113 | |
114 | /* save our object in the file's private structure */ | |
115 | file->private_data = dev; | |
116 | ||
117 | exit: | |
118 | return retval; | |
119 | } | |
120 | ||
121 | static int skel_release(struct inode *inode, struct file *file) | |
122 | { | |
123 | struct usb_skel *dev; | |
124 | ||
e53e841d | 125 | dev = file->private_data; |
1da177e4 LT |
126 | if (dev == NULL) |
127 | return -ENODEV; | |
128 | ||
01d883d4 AS |
129 | /* allow the device to be autosuspended */ |
130 | mutex_lock(&dev->io_mutex); | |
e28dbb06 | 131 | if (dev->interface) |
01d883d4 AS |
132 | usb_autopm_put_interface(dev->interface); |
133 | mutex_unlock(&dev->io_mutex); | |
134 | ||
1da177e4 LT |
135 | /* decrement the count on our device */ |
136 | kref_put(&dev->kref, skel_delete); | |
137 | return 0; | |
138 | } | |
139 | ||
403dfb58 ON |
140 | static int skel_flush(struct file *file, fl_owner_t id) |
141 | { | |
142 | struct usb_skel *dev; | |
143 | int res; | |
144 | ||
e53e841d | 145 | dev = file->private_data; |
403dfb58 ON |
146 | if (dev == NULL) |
147 | return -ENODEV; | |
148 | ||
149 | /* wait for io to stop */ | |
150 | mutex_lock(&dev->io_mutex); | |
151 | skel_draw_down(dev); | |
152 | ||
153 | /* read out errors, leave subsequent opens a clean slate */ | |
154 | spin_lock_irq(&dev->err_lock); | |
155 | res = dev->errors ? (dev->errors == -EPIPE ? -EPIPE : -EIO) : 0; | |
156 | dev->errors = 0; | |
157 | spin_unlock_irq(&dev->err_lock); | |
158 | ||
159 | mutex_unlock(&dev->io_mutex); | |
160 | ||
161 | return res; | |
162 | } | |
163 | ||
e7389cc9 ON |
164 | static void skel_read_bulk_callback(struct urb *urb) |
165 | { | |
166 | struct usb_skel *dev; | |
167 | ||
168 | dev = urb->context; | |
169 | ||
170 | spin_lock(&dev->err_lock); | |
171 | /* sync/async unlink faults aren't errors */ | |
172 | if (urb->status) { | |
3ae9da1c | 173 | if (!(urb->status == -ENOENT || |
e7389cc9 ON |
174 | urb->status == -ECONNRESET || |
175 | urb->status == -ESHUTDOWN)) | |
4212cd74 GKH |
176 | dev_err(&dev->interface->dev, |
177 | "%s - nonzero write bulk status received: %d\n", | |
178 | __func__, urb->status); | |
e7389cc9 ON |
179 | |
180 | dev->errors = urb->status; | |
181 | } else { | |
182 | dev->bulk_in_filled = urb->actual_length; | |
183 | } | |
184 | dev->ongoing_read = 0; | |
185 | spin_unlock(&dev->err_lock); | |
186 | ||
c79041a4 | 187 | wake_up_interruptible(&dev->bulk_in_wait); |
e7389cc9 ON |
188 | } |
189 | ||
190 | static int skel_do_read_io(struct usb_skel *dev, size_t count) | |
191 | { | |
192 | int rv; | |
193 | ||
194 | /* prepare a read */ | |
195 | usb_fill_bulk_urb(dev->bulk_in_urb, | |
196 | dev->udev, | |
197 | usb_rcvbulkpipe(dev->udev, | |
198 | dev->bulk_in_endpointAddr), | |
199 | dev->bulk_in_buffer, | |
200 | min(dev->bulk_in_size, count), | |
201 | skel_read_bulk_callback, | |
202 | dev); | |
203 | /* tell everybody to leave the URB alone */ | |
204 | spin_lock_irq(&dev->err_lock); | |
205 | dev->ongoing_read = 1; | |
206 | spin_unlock_irq(&dev->err_lock); | |
207 | ||
c79041a4 DX |
208 | /* submit bulk in urb, which means no data to deliver */ |
209 | dev->bulk_in_filled = 0; | |
210 | dev->bulk_in_copied = 0; | |
211 | ||
e7389cc9 ON |
212 | /* do it */ |
213 | rv = usb_submit_urb(dev->bulk_in_urb, GFP_KERNEL); | |
214 | if (rv < 0) { | |
4212cd74 GKH |
215 | dev_err(&dev->interface->dev, |
216 | "%s - failed submitting read urb, error %d\n", | |
e7389cc9 | 217 | __func__, rv); |
e7389cc9 ON |
218 | rv = (rv == -ENOMEM) ? rv : -EIO; |
219 | spin_lock_irq(&dev->err_lock); | |
220 | dev->ongoing_read = 0; | |
221 | spin_unlock_irq(&dev->err_lock); | |
222 | } | |
223 | ||
224 | return rv; | |
225 | } | |
226 | ||
3ae9da1c GKH |
227 | static ssize_t skel_read(struct file *file, char *buffer, size_t count, |
228 | loff_t *ppos) | |
1da177e4 LT |
229 | { |
230 | struct usb_skel *dev; | |
e7389cc9 ON |
231 | int rv; |
232 | bool ongoing_io; | |
1da177e4 | 233 | |
e53e841d | 234 | dev = file->private_data; |
121e287c | 235 | |
e7389cc9 ON |
236 | /* if we cannot read at all, return EOF */ |
237 | if (!dev->bulk_in_urb || !count) | |
238 | return 0; | |
239 | ||
240 | /* no concurrent readers */ | |
241 | rv = mutex_lock_interruptible(&dev->io_mutex); | |
242 | if (rv < 0) | |
243 | return rv; | |
244 | ||
121e287c | 245 | if (!dev->interface) { /* disconnect() was called */ |
e7389cc9 | 246 | rv = -ENODEV; |
121e287c AS |
247 | goto exit; |
248 | } | |
249 | ||
e7389cc9 ON |
250 | /* if IO is under way, we must not touch things */ |
251 | retry: | |
252 | spin_lock_irq(&dev->err_lock); | |
253 | ongoing_io = dev->ongoing_read; | |
254 | spin_unlock_irq(&dev->err_lock); | |
255 | ||
256 | if (ongoing_io) { | |
8cd01664 ON |
257 | /* nonblocking IO shall not wait */ |
258 | if (file->f_flags & O_NONBLOCK) { | |
259 | rv = -EAGAIN; | |
260 | goto exit; | |
261 | } | |
e7389cc9 ON |
262 | /* |
263 | * IO may take forever | |
264 | * hence wait in an interruptible state | |
265 | */ | |
c79041a4 | 266 | rv = wait_event_interruptible(dev->bulk_in_wait, (!dev->ongoing_read)); |
e7389cc9 ON |
267 | if (rv < 0) |
268 | goto exit; | |
1da177e4 LT |
269 | } |
270 | ||
e7389cc9 | 271 | /* errors must be reported */ |
3ae9da1c GKH |
272 | rv = dev->errors; |
273 | if (rv < 0) { | |
e7389cc9 ON |
274 | /* any error is reported once */ |
275 | dev->errors = 0; | |
276 | /* to preserve notifications about reset */ | |
277 | rv = (rv == -EPIPE) ? rv : -EIO; | |
e7389cc9 ON |
278 | /* report it */ |
279 | goto exit; | |
280 | } | |
281 | ||
282 | /* | |
283 | * if the buffer is filled we may satisfy the read | |
284 | * else we need to start IO | |
285 | */ | |
286 | ||
287 | if (dev->bulk_in_filled) { | |
288 | /* we had read data */ | |
289 | size_t available = dev->bulk_in_filled - dev->bulk_in_copied; | |
290 | size_t chunk = min(available, count); | |
291 | ||
292 | if (!available) { | |
293 | /* | |
294 | * all data has been used | |
295 | * actual IO needs to be done | |
296 | */ | |
297 | rv = skel_do_read_io(dev, count); | |
298 | if (rv < 0) | |
299 | goto exit; | |
300 | else | |
301 | goto retry; | |
302 | } | |
303 | /* | |
304 | * data is available | |
305 | * chunk tells us how much shall be copied | |
306 | */ | |
307 | ||
308 | if (copy_to_user(buffer, | |
309 | dev->bulk_in_buffer + dev->bulk_in_copied, | |
310 | chunk)) | |
311 | rv = -EFAULT; | |
312 | else | |
313 | rv = chunk; | |
314 | ||
315 | dev->bulk_in_copied += chunk; | |
316 | ||
317 | /* | |
318 | * if we are asked for more than we have, | |
319 | * we start IO but don't wait | |
320 | */ | |
321 | if (available < count) | |
322 | skel_do_read_io(dev, count - chunk); | |
323 | } else { | |
324 | /* no data in the buffer */ | |
325 | rv = skel_do_read_io(dev, count); | |
326 | if (rv < 0) | |
327 | goto exit; | |
140983c2 | 328 | else |
e7389cc9 ON |
329 | goto retry; |
330 | } | |
121e287c AS |
331 | exit: |
332 | mutex_unlock(&dev->io_mutex); | |
e7389cc9 | 333 | return rv; |
1da177e4 LT |
334 | } |
335 | ||
7d12e780 | 336 | static void skel_write_bulk_callback(struct urb *urb) |
1da177e4 LT |
337 | { |
338 | struct usb_skel *dev; | |
339 | ||
cdc97792 | 340 | dev = urb->context; |
1da177e4 LT |
341 | |
342 | /* sync/async unlink faults aren't errors */ | |
403dfb58 | 343 | if (urb->status) { |
3ae9da1c | 344 | if (!(urb->status == -ENOENT || |
403dfb58 ON |
345 | urb->status == -ECONNRESET || |
346 | urb->status == -ESHUTDOWN)) | |
4212cd74 GKH |
347 | dev_err(&dev->interface->dev, |
348 | "%s - nonzero write bulk status received: %d\n", | |
349 | __func__, urb->status); | |
403dfb58 ON |
350 | |
351 | spin_lock(&dev->err_lock); | |
352 | dev->errors = urb->status; | |
353 | spin_unlock(&dev->err_lock); | |
1da177e4 LT |
354 | } |
355 | ||
356 | /* free up our allocated buffer */ | |
997ea58e DM |
357 | usb_free_coherent(urb->dev, urb->transfer_buffer_length, |
358 | urb->transfer_buffer, urb->transfer_dma); | |
ff906518 | 359 | up(&dev->limit_sem); |
1da177e4 LT |
360 | } |
361 | ||
3ae9da1c GKH |
362 | static ssize_t skel_write(struct file *file, const char *user_buffer, |
363 | size_t count, loff_t *ppos) | |
1da177e4 LT |
364 | { |
365 | struct usb_skel *dev; | |
366 | int retval = 0; | |
367 | struct urb *urb = NULL; | |
368 | char *buf = NULL; | |
c8dd7709 | 369 | size_t writesize = min(count, (size_t)MAX_TRANSFER); |
1da177e4 | 370 | |
e53e841d | 371 | dev = file->private_data; |
1da177e4 LT |
372 | |
373 | /* verify that we actually have some data to write */ | |
374 | if (count == 0) | |
375 | goto exit; | |
376 | ||
3ae9da1c GKH |
377 | /* |
378 | * limit the number of URBs in flight to stop a user from using up all | |
379 | * RAM | |
380 | */ | |
4de84057 | 381 | if (!(file->f_flags & O_NONBLOCK)) { |
79819986 ON |
382 | if (down_interruptible(&dev->limit_sem)) { |
383 | retval = -ERESTARTSYS; | |
384 | goto exit; | |
385 | } | |
386 | } else { | |
387 | if (down_trylock(&dev->limit_sem)) { | |
388 | retval = -EAGAIN; | |
389 | goto exit; | |
390 | } | |
c8dd7709 | 391 | } |
ff906518 | 392 | |
403dfb58 | 393 | spin_lock_irq(&dev->err_lock); |
3ae9da1c GKH |
394 | retval = dev->errors; |
395 | if (retval < 0) { | |
403dfb58 ON |
396 | /* any error is reported once */ |
397 | dev->errors = 0; | |
398 | /* to preserve notifications about reset */ | |
399 | retval = (retval == -EPIPE) ? retval : -EIO; | |
400 | } | |
401 | spin_unlock_irq(&dev->err_lock); | |
402 | if (retval < 0) | |
403 | goto error; | |
404 | ||
1da177e4 LT |
405 | /* create a urb, and a buffer for it, and copy the data to the urb */ |
406 | urb = usb_alloc_urb(0, GFP_KERNEL); | |
407 | if (!urb) { | |
408 | retval = -ENOMEM; | |
409 | goto error; | |
410 | } | |
411 | ||
997ea58e DM |
412 | buf = usb_alloc_coherent(dev->udev, writesize, GFP_KERNEL, |
413 | &urb->transfer_dma); | |
1da177e4 LT |
414 | if (!buf) { |
415 | retval = -ENOMEM; | |
416 | goto error; | |
417 | } | |
418 | ||
ff906518 | 419 | if (copy_from_user(buf, user_buffer, writesize)) { |
1da177e4 LT |
420 | retval = -EFAULT; |
421 | goto error; | |
422 | } | |
423 | ||
ba35e02b ON |
424 | /* this lock makes sure we don't submit URBs to gone devices */ |
425 | mutex_lock(&dev->io_mutex); | |
426 | if (!dev->interface) { /* disconnect() was called */ | |
427 | mutex_unlock(&dev->io_mutex); | |
428 | retval = -ENODEV; | |
429 | goto error; | |
430 | } | |
431 | ||
1da177e4 LT |
432 | /* initialize the urb properly */ |
433 | usb_fill_bulk_urb(urb, dev->udev, | |
434 | usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr), | |
ff906518 | 435 | buf, writesize, skel_write_bulk_callback, dev); |
1da177e4 | 436 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
403dfb58 | 437 | usb_anchor_urb(urb, &dev->submitted); |
1da177e4 LT |
438 | |
439 | /* send the data out the bulk port */ | |
440 | retval = usb_submit_urb(urb, GFP_KERNEL); | |
ba35e02b | 441 | mutex_unlock(&dev->io_mutex); |
1da177e4 | 442 | if (retval) { |
4212cd74 GKH |
443 | dev_err(&dev->interface->dev, |
444 | "%s - failed submitting write urb, error %d\n", | |
445 | __func__, retval); | |
403dfb58 | 446 | goto error_unanchor; |
1da177e4 LT |
447 | } |
448 | ||
3ae9da1c GKH |
449 | /* |
450 | * release our reference to this urb, the USB core will eventually free | |
451 | * it entirely | |
452 | */ | |
1da177e4 LT |
453 | usb_free_urb(urb); |
454 | ||
ba35e02b | 455 | |
ff906518 | 456 | return writesize; |
1da177e4 | 457 | |
403dfb58 ON |
458 | error_unanchor: |
459 | usb_unanchor_urb(urb); | |
1da177e4 | 460 | error: |
121e287c | 461 | if (urb) { |
997ea58e | 462 | usb_free_coherent(dev->udev, writesize, buf, urb->transfer_dma); |
121e287c AS |
463 | usb_free_urb(urb); |
464 | } | |
ff906518 | 465 | up(&dev->limit_sem); |
121e287c AS |
466 | |
467 | exit: | |
1da177e4 LT |
468 | return retval; |
469 | } | |
470 | ||
066202dd | 471 | static const struct file_operations skel_fops = { |
1da177e4 LT |
472 | .owner = THIS_MODULE, |
473 | .read = skel_read, | |
474 | .write = skel_write, | |
475 | .open = skel_open, | |
476 | .release = skel_release, | |
403dfb58 | 477 | .flush = skel_flush, |
6038f373 | 478 | .llseek = noop_llseek, |
1da177e4 LT |
479 | }; |
480 | ||
c0704541 | 481 | /* |
1da177e4 | 482 | * usb class driver info in order to get a minor number from the usb core, |
595b14cb | 483 | * and to have the device registered with the driver core |
1da177e4 LT |
484 | */ |
485 | static struct usb_class_driver skel_class = { | |
d6e5bcf4 | 486 | .name = "skel%d", |
1da177e4 | 487 | .fops = &skel_fops, |
1da177e4 LT |
488 | .minor_base = USB_SKEL_MINOR_BASE, |
489 | }; | |
490 | ||
3ae9da1c GKH |
491 | static int skel_probe(struct usb_interface *interface, |
492 | const struct usb_device_id *id) | |
1da177e4 | 493 | { |
c0704541 | 494 | struct usb_skel *dev; |
1da177e4 LT |
495 | struct usb_host_interface *iface_desc; |
496 | struct usb_endpoint_descriptor *endpoint; | |
497 | size_t buffer_size; | |
498 | int i; | |
499 | int retval = -ENOMEM; | |
500 | ||
501 | /* allocate memory for our device state and initialize it */ | |
ff906518 | 502 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
c0704541 | 503 | if (!dev) { |
4212cd74 | 504 | dev_err(&interface->dev, "Out of memory\n"); |
1da177e4 LT |
505 | goto error; |
506 | } | |
1da177e4 | 507 | kref_init(&dev->kref); |
ff906518 | 508 | sema_init(&dev->limit_sem, WRITES_IN_FLIGHT); |
121e287c | 509 | mutex_init(&dev->io_mutex); |
403dfb58 ON |
510 | spin_lock_init(&dev->err_lock); |
511 | init_usb_anchor(&dev->submitted); | |
c79041a4 | 512 | init_waitqueue_head(&dev->bulk_in_wait); |
1da177e4 LT |
513 | |
514 | dev->udev = usb_get_dev(interface_to_usbdev(interface)); | |
515 | dev->interface = interface; | |
516 | ||
517 | /* set up the endpoint information */ | |
518 | /* use only the first bulk-in and bulk-out endpoints */ | |
519 | iface_desc = interface->cur_altsetting; | |
520 | for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { | |
521 | endpoint = &iface_desc->endpoint[i].desc; | |
522 | ||
523 | if (!dev->bulk_in_endpointAddr && | |
c0704541 | 524 | usb_endpoint_is_bulk_in(endpoint)) { |
1da177e4 | 525 | /* we found a bulk in endpoint */ |
29cc8897 | 526 | buffer_size = usb_endpoint_maxp(endpoint); |
1da177e4 LT |
527 | dev->bulk_in_size = buffer_size; |
528 | dev->bulk_in_endpointAddr = endpoint->bEndpointAddress; | |
529 | dev->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL); | |
530 | if (!dev->bulk_in_buffer) { | |
4212cd74 GKH |
531 | dev_err(&interface->dev, |
532 | "Could not allocate bulk_in_buffer\n"); | |
1da177e4 LT |
533 | goto error; |
534 | } | |
e7389cc9 ON |
535 | dev->bulk_in_urb = usb_alloc_urb(0, GFP_KERNEL); |
536 | if (!dev->bulk_in_urb) { | |
4212cd74 GKH |
537 | dev_err(&interface->dev, |
538 | "Could not allocate bulk_in_urb\n"); | |
e7389cc9 ON |
539 | goto error; |
540 | } | |
1da177e4 LT |
541 | } |
542 | ||
543 | if (!dev->bulk_out_endpointAddr && | |
c0704541 | 544 | usb_endpoint_is_bulk_out(endpoint)) { |
1da177e4 LT |
545 | /* we found a bulk out endpoint */ |
546 | dev->bulk_out_endpointAddr = endpoint->bEndpointAddress; | |
547 | } | |
548 | } | |
549 | if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) { | |
4212cd74 GKH |
550 | dev_err(&interface->dev, |
551 | "Could not find both bulk-in and bulk-out endpoints\n"); | |
1da177e4 LT |
552 | goto error; |
553 | } | |
554 | ||
555 | /* save our data pointer in this interface device */ | |
556 | usb_set_intfdata(interface, dev); | |
557 | ||
558 | /* we can register the device now, as it is ready */ | |
559 | retval = usb_register_dev(interface, &skel_class); | |
560 | if (retval) { | |
561 | /* something prevented us from registering this driver */ | |
4212cd74 GKH |
562 | dev_err(&interface->dev, |
563 | "Not able to get a minor for this device.\n"); | |
1da177e4 LT |
564 | usb_set_intfdata(interface, NULL); |
565 | goto error; | |
566 | } | |
567 | ||
568 | /* let the user know what node this device is now attached to */ | |
a5f5ea23 MK |
569 | dev_info(&interface->dev, |
570 | "USB Skeleton device now attached to USBSkel-%d", | |
571 | interface->minor); | |
1da177e4 LT |
572 | return 0; |
573 | ||
574 | error: | |
575 | if (dev) | |
ba35e02b | 576 | /* this frees allocated memory */ |
1da177e4 LT |
577 | kref_put(&dev->kref, skel_delete); |
578 | return retval; | |
579 | } | |
580 | ||
581 | static void skel_disconnect(struct usb_interface *interface) | |
582 | { | |
583 | struct usb_skel *dev; | |
584 | int minor = interface->minor; | |
585 | ||
1da177e4 | 586 | dev = usb_get_intfdata(interface); |
52a74999 | 587 | usb_set_intfdata(interface, NULL); |
1da177e4 LT |
588 | |
589 | /* give back our minor */ | |
590 | usb_deregister_dev(interface, &skel_class); | |
591 | ||
121e287c AS |
592 | /* prevent more I/O from starting */ |
593 | mutex_lock(&dev->io_mutex); | |
594 | dev->interface = NULL; | |
595 | mutex_unlock(&dev->io_mutex); | |
596 | ||
e73c7247 ON |
597 | usb_kill_anchored_urbs(&dev->submitted); |
598 | ||
1da177e4 LT |
599 | /* decrement our usage count */ |
600 | kref_put(&dev->kref, skel_delete); | |
601 | ||
a5f5ea23 | 602 | dev_info(&interface->dev, "USB Skeleton #%d now disconnected", minor); |
1da177e4 LT |
603 | } |
604 | ||
403dfb58 ON |
605 | static void skel_draw_down(struct usb_skel *dev) |
606 | { | |
607 | int time; | |
608 | ||
609 | time = usb_wait_anchor_empty_timeout(&dev->submitted, 1000); | |
610 | if (!time) | |
611 | usb_kill_anchored_urbs(&dev->submitted); | |
e7389cc9 | 612 | usb_kill_urb(dev->bulk_in_urb); |
403dfb58 ON |
613 | } |
614 | ||
758f7e16 ON |
615 | static int skel_suspend(struct usb_interface *intf, pm_message_t message) |
616 | { | |
617 | struct usb_skel *dev = usb_get_intfdata(intf); | |
618 | ||
619 | if (!dev) | |
620 | return 0; | |
621 | skel_draw_down(dev); | |
622 | return 0; | |
623 | } | |
624 | ||
3ae9da1c | 625 | static int skel_resume(struct usb_interface *intf) |
758f7e16 ON |
626 | { |
627 | return 0; | |
628 | } | |
629 | ||
87d093e2 ON |
630 | static int skel_pre_reset(struct usb_interface *intf) |
631 | { | |
632 | struct usb_skel *dev = usb_get_intfdata(intf); | |
633 | ||
634 | mutex_lock(&dev->io_mutex); | |
635 | skel_draw_down(dev); | |
636 | ||
637 | return 0; | |
638 | } | |
639 | ||
640 | static int skel_post_reset(struct usb_interface *intf) | |
641 | { | |
642 | struct usb_skel *dev = usb_get_intfdata(intf); | |
643 | ||
644 | /* we are sure no URBs are active - no locking needed */ | |
645 | dev->errors = -EPIPE; | |
646 | mutex_unlock(&dev->io_mutex); | |
647 | ||
648 | return 0; | |
649 | } | |
650 | ||
1da177e4 | 651 | static struct usb_driver skel_driver = { |
1da177e4 LT |
652 | .name = "skeleton", |
653 | .probe = skel_probe, | |
654 | .disconnect = skel_disconnect, | |
758f7e16 ON |
655 | .suspend = skel_suspend, |
656 | .resume = skel_resume, | |
87d093e2 ON |
657 | .pre_reset = skel_pre_reset, |
658 | .post_reset = skel_post_reset, | |
1da177e4 | 659 | .id_table = skel_table, |
ba35e02b | 660 | .supports_autosuspend = 1, |
1da177e4 LT |
661 | }; |
662 | ||
65db4305 | 663 | module_usb_driver(skel_driver); |
1da177e4 LT |
664 | |
665 | MODULE_LICENSE("GPL"); |