Commit | Line | Data |
---|---|---|
afba937e ON |
1 | /* |
2 | * cdc-wdm.c | |
3 | * | |
4 | * This driver supports USB CDC WCM Device Management. | |
5 | * | |
052fbc0d | 6 | * Copyright (c) 2007-2009 Oliver Neukum |
afba937e ON |
7 | * |
8 | * Some code taken from cdc-acm.c | |
9 | * | |
10 | * Released under the GPLv2. | |
11 | * | |
12 | * Many thanks to Carl Nordbeck | |
13 | */ | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/errno.h> | |
3edce1cf | 16 | #include <linux/ioctl.h> |
afba937e ON |
17 | #include <linux/slab.h> |
18 | #include <linux/module.h> | |
afba937e ON |
19 | #include <linux/mutex.h> |
20 | #include <linux/uaccess.h> | |
21 | #include <linux/bitops.h> | |
22 | #include <linux/poll.h> | |
23 | #include <linux/usb.h> | |
24 | #include <linux/usb/cdc.h> | |
25 | #include <asm/byteorder.h> | |
26 | #include <asm/unaligned.h> | |
3cc36157 | 27 | #include <linux/usb/cdc-wdm.h> |
afba937e ON |
28 | |
29 | /* | |
30 | * Version Information | |
31 | */ | |
87d65e54 | 32 | #define DRIVER_VERSION "v0.03" |
afba937e | 33 | #define DRIVER_AUTHOR "Oliver Neukum" |
87d65e54 | 34 | #define DRIVER_DESC "USB Abstract Control Model driver for USB WCM Device Management" |
afba937e | 35 | |
6ef4852b | 36 | static const struct usb_device_id wdm_ids[] = { |
afba937e ON |
37 | { |
38 | .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS | | |
39 | USB_DEVICE_ID_MATCH_INT_SUBCLASS, | |
40 | .bInterfaceClass = USB_CLASS_COMM, | |
41 | .bInterfaceSubClass = USB_CDC_SUBCLASS_DMM | |
42 | }, | |
43 | { } | |
44 | }; | |
45 | ||
aa5380b9 ON |
46 | MODULE_DEVICE_TABLE (usb, wdm_ids); |
47 | ||
afba937e ON |
48 | #define WDM_MINOR_BASE 176 |
49 | ||
50 | ||
51 | #define WDM_IN_USE 1 | |
52 | #define WDM_DISCONNECTING 2 | |
53 | #define WDM_RESULT 3 | |
54 | #define WDM_READ 4 | |
55 | #define WDM_INT_STALL 5 | |
56 | #define WDM_POLL_RUNNING 6 | |
922a5ead | 57 | #define WDM_RESPONDING 7 |
beb1d35f | 58 | #define WDM_SUSPENDING 8 |
88044202 | 59 | #define WDM_RESETTING 9 |
c0f5ecee | 60 | #define WDM_OVERFLOW 10 |
afba937e ON |
61 | |
62 | #define WDM_MAX 16 | |
63 | ||
7e3054a0 BM |
64 | /* CDC-WMC r1.1 requires wMaxCommand to be "at least 256 decimal (0x100)" */ |
65 | #define WDM_DEFAULT_BUFSIZE 256 | |
afba937e ON |
66 | |
67 | static DEFINE_MUTEX(wdm_mutex); | |
b0c13860 BM |
68 | static DEFINE_SPINLOCK(wdm_device_list_lock); |
69 | static LIST_HEAD(wdm_device_list); | |
afba937e ON |
70 | |
71 | /* --- method tables --- */ | |
72 | ||
73 | struct wdm_device { | |
74 | u8 *inbuf; /* buffer for response */ | |
75 | u8 *outbuf; /* buffer for command */ | |
76 | u8 *sbuf; /* buffer for status */ | |
77 | u8 *ubuf; /* buffer for copy to user space */ | |
78 | ||
79 | struct urb *command; | |
80 | struct urb *response; | |
81 | struct urb *validity; | |
82 | struct usb_interface *intf; | |
83 | struct usb_ctrlrequest *orq; | |
84 | struct usb_ctrlrequest *irq; | |
85 | spinlock_t iuspin; | |
86 | ||
87 | unsigned long flags; | |
88 | u16 bufsize; | |
89 | u16 wMaxCommand; | |
90 | u16 wMaxPacketSize; | |
afba937e ON |
91 | __le16 inum; |
92 | int reslength; | |
93 | int length; | |
94 | int read; | |
95 | int count; | |
96 | dma_addr_t shandle; | |
97 | dma_addr_t ihandle; | |
e8537bd2 BM |
98 | struct mutex wlock; |
99 | struct mutex rlock; | |
afba937e ON |
100 | wait_queue_head_t wait; |
101 | struct work_struct rxwork; | |
102 | int werr; | |
103 | int rerr; | |
73e06865 | 104 | int resp_count; |
b0c13860 BM |
105 | |
106 | struct list_head device_list; | |
3cc36157 | 107 | int (*manage_power)(struct usb_interface *, int); |
afba937e ON |
108 | }; |
109 | ||
110 | static struct usb_driver wdm_driver; | |
111 | ||
b0c13860 BM |
112 | /* return intfdata if we own the interface, else look up intf in the list */ |
113 | static struct wdm_device *wdm_find_device(struct usb_interface *intf) | |
114 | { | |
6a448868 | 115 | struct wdm_device *desc; |
b0c13860 BM |
116 | |
117 | spin_lock(&wdm_device_list_lock); | |
118 | list_for_each_entry(desc, &wdm_device_list, device_list) | |
119 | if (desc->intf == intf) | |
6a448868 BM |
120 | goto found; |
121 | desc = NULL; | |
122 | found: | |
b0c13860 BM |
123 | spin_unlock(&wdm_device_list_lock); |
124 | ||
125 | return desc; | |
126 | } | |
127 | ||
128 | static struct wdm_device *wdm_find_device_by_minor(int minor) | |
129 | { | |
6a448868 | 130 | struct wdm_device *desc; |
b0c13860 BM |
131 | |
132 | spin_lock(&wdm_device_list_lock); | |
133 | list_for_each_entry(desc, &wdm_device_list, device_list) | |
134 | if (desc->intf->minor == minor) | |
6a448868 BM |
135 | goto found; |
136 | desc = NULL; | |
137 | found: | |
b0c13860 BM |
138 | spin_unlock(&wdm_device_list_lock); |
139 | ||
140 | return desc; | |
141 | } | |
142 | ||
afba937e ON |
143 | /* --- callbacks --- */ |
144 | static void wdm_out_callback(struct urb *urb) | |
145 | { | |
146 | struct wdm_device *desc; | |
147 | desc = urb->context; | |
148 | spin_lock(&desc->iuspin); | |
149 | desc->werr = urb->status; | |
150 | spin_unlock(&desc->iuspin); | |
afba937e | 151 | kfree(desc->outbuf); |
5c22837a ON |
152 | desc->outbuf = NULL; |
153 | clear_bit(WDM_IN_USE, &desc->flags); | |
afba937e ON |
154 | wake_up(&desc->wait); |
155 | } | |
156 | ||
157 | static void wdm_in_callback(struct urb *urb) | |
158 | { | |
159 | struct wdm_device *desc = urb->context; | |
160 | int status = urb->status; | |
c0f5ecee | 161 | int length = urb->actual_length; |
afba937e ON |
162 | |
163 | spin_lock(&desc->iuspin); | |
922a5ead | 164 | clear_bit(WDM_RESPONDING, &desc->flags); |
afba937e ON |
165 | |
166 | if (status) { | |
167 | switch (status) { | |
168 | case -ENOENT: | |
169 | dev_dbg(&desc->intf->dev, | |
170 | "nonzero urb status received: -ENOENT"); | |
922a5ead | 171 | goto skip_error; |
afba937e ON |
172 | case -ECONNRESET: |
173 | dev_dbg(&desc->intf->dev, | |
174 | "nonzero urb status received: -ECONNRESET"); | |
922a5ead | 175 | goto skip_error; |
afba937e ON |
176 | case -ESHUTDOWN: |
177 | dev_dbg(&desc->intf->dev, | |
178 | "nonzero urb status received: -ESHUTDOWN"); | |
922a5ead | 179 | goto skip_error; |
afba937e | 180 | case -EPIPE: |
9908a32e GKH |
181 | dev_err(&desc->intf->dev, |
182 | "nonzero urb status received: -EPIPE\n"); | |
afba937e ON |
183 | break; |
184 | default: | |
9908a32e GKH |
185 | dev_err(&desc->intf->dev, |
186 | "Unexpected error %d\n", status); | |
afba937e ON |
187 | break; |
188 | } | |
189 | } | |
190 | ||
191 | desc->rerr = status; | |
c0f5ecee ON |
192 | if (length + desc->length > desc->wMaxCommand) { |
193 | /* The buffer would overflow */ | |
194 | set_bit(WDM_OVERFLOW, &desc->flags); | |
195 | } else { | |
196 | /* we may already be in overflow */ | |
197 | if (!test_bit(WDM_OVERFLOW, &desc->flags)) { | |
198 | memmove(desc->ubuf + desc->length, desc->inbuf, length); | |
199 | desc->length += length; | |
200 | desc->reslength = length; | |
201 | } | |
202 | } | |
922a5ead | 203 | skip_error: |
afba937e ON |
204 | wake_up(&desc->wait); |
205 | ||
206 | set_bit(WDM_READ, &desc->flags); | |
207 | spin_unlock(&desc->iuspin); | |
208 | } | |
209 | ||
210 | static void wdm_int_callback(struct urb *urb) | |
211 | { | |
212 | int rv = 0; | |
6dd433e6 | 213 | int responding; |
afba937e ON |
214 | int status = urb->status; |
215 | struct wdm_device *desc; | |
afba937e ON |
216 | struct usb_cdc_notification *dr; |
217 | ||
218 | desc = urb->context; | |
afba937e ON |
219 | dr = (struct usb_cdc_notification *)desc->sbuf; |
220 | ||
221 | if (status) { | |
222 | switch (status) { | |
223 | case -ESHUTDOWN: | |
224 | case -ENOENT: | |
225 | case -ECONNRESET: | |
226 | return; /* unplug */ | |
227 | case -EPIPE: | |
228 | set_bit(WDM_INT_STALL, &desc->flags); | |
9908a32e | 229 | dev_err(&desc->intf->dev, "Stall on int endpoint\n"); |
afba937e ON |
230 | goto sw; /* halt is cleared in work */ |
231 | default: | |
9908a32e GKH |
232 | dev_err(&desc->intf->dev, |
233 | "nonzero urb status received: %d\n", status); | |
afba937e ON |
234 | break; |
235 | } | |
236 | } | |
237 | ||
238 | if (urb->actual_length < sizeof(struct usb_cdc_notification)) { | |
9908a32e GKH |
239 | dev_err(&desc->intf->dev, "wdm_int_callback - %d bytes\n", |
240 | urb->actual_length); | |
afba937e ON |
241 | goto exit; |
242 | } | |
243 | ||
244 | switch (dr->bNotificationType) { | |
245 | case USB_CDC_NOTIFY_RESPONSE_AVAILABLE: | |
246 | dev_dbg(&desc->intf->dev, | |
247 | "NOTIFY_RESPONSE_AVAILABLE received: index %d len %d", | |
323ece54 | 248 | le16_to_cpu(dr->wIndex), le16_to_cpu(dr->wLength)); |
afba937e ON |
249 | break; |
250 | ||
251 | case USB_CDC_NOTIFY_NETWORK_CONNECTION: | |
252 | ||
253 | dev_dbg(&desc->intf->dev, | |
254 | "NOTIFY_NETWORK_CONNECTION %s network", | |
255 | dr->wValue ? "connected to" : "disconnected from"); | |
256 | goto exit; | |
9983d6dc BM |
257 | case USB_CDC_NOTIFY_SPEED_CHANGE: |
258 | dev_dbg(&desc->intf->dev, "SPEED_CHANGE received (len %u)", | |
259 | urb->actual_length); | |
260 | goto exit; | |
afba937e ON |
261 | default: |
262 | clear_bit(WDM_POLL_RUNNING, &desc->flags); | |
9908a32e GKH |
263 | dev_err(&desc->intf->dev, |
264 | "unknown notification %d received: index %d len %d\n", | |
323ece54 ON |
265 | dr->bNotificationType, |
266 | le16_to_cpu(dr->wIndex), | |
267 | le16_to_cpu(dr->wLength)); | |
afba937e ON |
268 | goto exit; |
269 | } | |
270 | ||
afba937e | 271 | spin_lock(&desc->iuspin); |
6dd433e6 | 272 | responding = test_and_set_bit(WDM_RESPONDING, &desc->flags); |
73e06865 GS |
273 | if (!desc->resp_count++ && !responding |
274 | && !test_bit(WDM_DISCONNECTING, &desc->flags) | |
beb1d35f | 275 | && !test_bit(WDM_SUSPENDING, &desc->flags)) { |
afba937e ON |
276 | rv = usb_submit_urb(desc->response, GFP_ATOMIC); |
277 | dev_dbg(&desc->intf->dev, "%s: usb_submit_urb %d", | |
278 | __func__, rv); | |
279 | } | |
280 | spin_unlock(&desc->iuspin); | |
281 | if (rv < 0) { | |
922a5ead | 282 | clear_bit(WDM_RESPONDING, &desc->flags); |
afba937e ON |
283 | if (rv == -EPERM) |
284 | return; | |
285 | if (rv == -ENOMEM) { | |
286 | sw: | |
287 | rv = schedule_work(&desc->rxwork); | |
288 | if (rv) | |
9908a32e GKH |
289 | dev_err(&desc->intf->dev, |
290 | "Cannot schedule work\n"); | |
afba937e ON |
291 | } |
292 | } | |
293 | exit: | |
294 | rv = usb_submit_urb(urb, GFP_ATOMIC); | |
295 | if (rv) | |
9908a32e GKH |
296 | dev_err(&desc->intf->dev, |
297 | "%s - usb_submit_urb failed with result %d\n", | |
298 | __func__, rv); | |
afba937e ON |
299 | |
300 | } | |
301 | ||
302 | static void kill_urbs(struct wdm_device *desc) | |
303 | { | |
17d80d56 | 304 | /* the order here is essential */ |
afba937e ON |
305 | usb_kill_urb(desc->command); |
306 | usb_kill_urb(desc->validity); | |
307 | usb_kill_urb(desc->response); | |
308 | } | |
309 | ||
310 | static void free_urbs(struct wdm_device *desc) | |
311 | { | |
312 | usb_free_urb(desc->validity); | |
313 | usb_free_urb(desc->response); | |
314 | usb_free_urb(desc->command); | |
315 | } | |
316 | ||
317 | static void cleanup(struct wdm_device *desc) | |
318 | { | |
8457d99c BM |
319 | kfree(desc->sbuf); |
320 | kfree(desc->inbuf); | |
afba937e ON |
321 | kfree(desc->orq); |
322 | kfree(desc->irq); | |
323 | kfree(desc->ubuf); | |
324 | free_urbs(desc); | |
325 | kfree(desc); | |
326 | } | |
327 | ||
328 | static ssize_t wdm_write | |
329 | (struct file *file, const char __user *buffer, size_t count, loff_t *ppos) | |
330 | { | |
331 | u8 *buf; | |
332 | int rv = -EMSGSIZE, r, we; | |
333 | struct wdm_device *desc = file->private_data; | |
334 | struct usb_ctrlrequest *req; | |
335 | ||
336 | if (count > desc->wMaxCommand) | |
337 | count = desc->wMaxCommand; | |
338 | ||
339 | spin_lock_irq(&desc->iuspin); | |
340 | we = desc->werr; | |
341 | desc->werr = 0; | |
342 | spin_unlock_irq(&desc->iuspin); | |
343 | if (we < 0) | |
76cb03e7 | 344 | return usb_translate_errors(we); |
afba937e | 345 | |
5c22837a | 346 | buf = kmalloc(count, GFP_KERNEL); |
860e41a7 ON |
347 | if (!buf) { |
348 | rv = -ENOMEM; | |
349 | goto outnl; | |
350 | } | |
351 | ||
352 | r = copy_from_user(buf, buffer, count); | |
353 | if (r > 0) { | |
860e41a7 | 354 | rv = -EFAULT; |
28965e17 | 355 | goto out_free_mem; |
860e41a7 ON |
356 | } |
357 | ||
358 | /* concurrent writes and disconnect */ | |
e8537bd2 | 359 | r = mutex_lock_interruptible(&desc->wlock); |
afba937e | 360 | rv = -ERESTARTSYS; |
28965e17 ON |
361 | if (r) |
362 | goto out_free_mem; | |
860e41a7 ON |
363 | |
364 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
860e41a7 | 365 | rv = -ENODEV; |
28965e17 | 366 | goto out_free_mem_lock; |
860e41a7 | 367 | } |
afba937e | 368 | |
17d80d56 | 369 | r = usb_autopm_get_interface(desc->intf); |
860e41a7 | 370 | if (r < 0) { |
12a98b2b | 371 | rv = usb_translate_errors(r); |
28965e17 | 372 | goto out_free_mem_lock; |
860e41a7 | 373 | } |
7f1dc313 | 374 | |
0cdfb819 | 375 | if (!(file->f_flags & O_NONBLOCK)) |
7f1dc313 ON |
376 | r = wait_event_interruptible(desc->wait, !test_bit(WDM_IN_USE, |
377 | &desc->flags)); | |
378 | else | |
379 | if (test_bit(WDM_IN_USE, &desc->flags)) | |
380 | r = -EAGAIN; | |
88044202 BM |
381 | |
382 | if (test_bit(WDM_RESETTING, &desc->flags)) | |
383 | r = -EIO; | |
384 | ||
860e41a7 | 385 | if (r < 0) { |
12a98b2b | 386 | rv = r; |
28965e17 | 387 | goto out_free_mem_pm; |
afba937e ON |
388 | } |
389 | ||
390 | req = desc->orq; | |
391 | usb_fill_control_urb( | |
392 | desc->command, | |
393 | interface_to_usbdev(desc->intf), | |
394 | /* using common endpoint 0 */ | |
395 | usb_sndctrlpipe(interface_to_usbdev(desc->intf), 0), | |
396 | (unsigned char *)req, | |
397 | buf, | |
398 | count, | |
399 | wdm_out_callback, | |
400 | desc | |
401 | ); | |
402 | ||
403 | req->bRequestType = (USB_DIR_OUT | USB_TYPE_CLASS | | |
404 | USB_RECIP_INTERFACE); | |
405 | req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND; | |
406 | req->wValue = 0; | |
323ece54 | 407 | req->wIndex = desc->inum; /* already converted */ |
afba937e ON |
408 | req->wLength = cpu_to_le16(count); |
409 | set_bit(WDM_IN_USE, &desc->flags); | |
5c22837a | 410 | desc->outbuf = buf; |
afba937e ON |
411 | |
412 | rv = usb_submit_urb(desc->command, GFP_KERNEL); | |
413 | if (rv < 0) { | |
5c22837a | 414 | desc->outbuf = NULL; |
afba937e | 415 | clear_bit(WDM_IN_USE, &desc->flags); |
9908a32e | 416 | dev_err(&desc->intf->dev, "Tx URB error: %d\n", rv); |
12a98b2b | 417 | rv = usb_translate_errors(rv); |
28965e17 | 418 | goto out_free_mem_pm; |
afba937e ON |
419 | } else { |
420 | dev_dbg(&desc->intf->dev, "Tx URB has been submitted index=%d", | |
323ece54 | 421 | le16_to_cpu(req->wIndex)); |
afba937e | 422 | } |
28965e17 | 423 | |
17d80d56 | 424 | usb_autopm_put_interface(desc->intf); |
e8537bd2 | 425 | mutex_unlock(&desc->wlock); |
afba937e ON |
426 | outnl: |
427 | return rv < 0 ? rv : count; | |
28965e17 ON |
428 | |
429 | out_free_mem_pm: | |
430 | usb_autopm_put_interface(desc->intf); | |
431 | out_free_mem_lock: | |
432 | mutex_unlock(&desc->wlock); | |
433 | out_free_mem: | |
434 | kfree(buf); | |
435 | return rv; | |
afba937e ON |
436 | } |
437 | ||
8dd5cd53 BM |
438 | /* |
439 | * clear WDM_READ flag and possibly submit the read urb if resp_count | |
440 | * is non-zero. | |
441 | * | |
442 | * Called with desc->iuspin locked | |
443 | */ | |
444 | static int clear_wdm_read_flag(struct wdm_device *desc) | |
445 | { | |
446 | int rv = 0; | |
447 | ||
448 | clear_bit(WDM_READ, &desc->flags); | |
449 | ||
450 | /* submit read urb only if the device is waiting for it */ | |
f563926f | 451 | if (!desc->resp_count || !--desc->resp_count) |
8dd5cd53 BM |
452 | goto out; |
453 | ||
454 | set_bit(WDM_RESPONDING, &desc->flags); | |
455 | spin_unlock_irq(&desc->iuspin); | |
456 | rv = usb_submit_urb(desc->response, GFP_KERNEL); | |
457 | spin_lock_irq(&desc->iuspin); | |
458 | if (rv) { | |
459 | dev_err(&desc->intf->dev, | |
460 | "usb_submit_urb failed with result %d\n", rv); | |
461 | ||
462 | /* make sure the next notification trigger a submit */ | |
463 | clear_bit(WDM_RESPONDING, &desc->flags); | |
464 | desc->resp_count = 0; | |
465 | } | |
466 | out: | |
467 | return rv; | |
468 | } | |
469 | ||
afba937e ON |
470 | static ssize_t wdm_read |
471 | (struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
472 | { | |
711c68b3 | 473 | int rv, cntr; |
afba937e ON |
474 | int i = 0; |
475 | struct wdm_device *desc = file->private_data; | |
476 | ||
477 | ||
e8537bd2 | 478 | rv = mutex_lock_interruptible(&desc->rlock); /*concurrent reads */ |
afba937e ON |
479 | if (rv < 0) |
480 | return -ERESTARTSYS; | |
481 | ||
711c68b3 BH |
482 | cntr = ACCESS_ONCE(desc->length); |
483 | if (cntr == 0) { | |
afba937e ON |
484 | desc->read = 0; |
485 | retry: | |
7f1dc313 ON |
486 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { |
487 | rv = -ENODEV; | |
488 | goto err; | |
489 | } | |
c0f5ecee ON |
490 | if (test_bit(WDM_OVERFLOW, &desc->flags)) { |
491 | clear_bit(WDM_OVERFLOW, &desc->flags); | |
492 | rv = -ENOBUFS; | |
493 | goto err; | |
494 | } | |
afba937e | 495 | i++; |
7f1dc313 ON |
496 | if (file->f_flags & O_NONBLOCK) { |
497 | if (!test_bit(WDM_READ, &desc->flags)) { | |
498 | rv = cntr ? cntr : -EAGAIN; | |
499 | goto err; | |
500 | } | |
501 | rv = 0; | |
502 | } else { | |
503 | rv = wait_event_interruptible(desc->wait, | |
504 | test_bit(WDM_READ, &desc->flags)); | |
505 | } | |
afba937e | 506 | |
7f1dc313 | 507 | /* may have happened while we slept */ |
17d80d56 ON |
508 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { |
509 | rv = -ENODEV; | |
510 | goto err; | |
511 | } | |
88044202 BM |
512 | if (test_bit(WDM_RESETTING, &desc->flags)) { |
513 | rv = -EIO; | |
514 | goto err; | |
515 | } | |
17d80d56 | 516 | usb_mark_last_busy(interface_to_usbdev(desc->intf)); |
afba937e ON |
517 | if (rv < 0) { |
518 | rv = -ERESTARTSYS; | |
519 | goto err; | |
520 | } | |
521 | ||
522 | spin_lock_irq(&desc->iuspin); | |
523 | ||
524 | if (desc->rerr) { /* read completed, error happened */ | |
85e8a0b9 | 525 | rv = usb_translate_errors(desc->rerr); |
afba937e ON |
526 | desc->rerr = 0; |
527 | spin_unlock_irq(&desc->iuspin); | |
afba937e ON |
528 | goto err; |
529 | } | |
530 | /* | |
531 | * recheck whether we've lost the race | |
532 | * against the completion handler | |
533 | */ | |
534 | if (!test_bit(WDM_READ, &desc->flags)) { /* lost race */ | |
535 | spin_unlock_irq(&desc->iuspin); | |
536 | goto retry; | |
537 | } | |
c0f5ecee | 538 | |
afba937e | 539 | if (!desc->reslength) { /* zero length read */ |
b086b6b1 | 540 | dev_dbg(&desc->intf->dev, "%s: zero length - clearing WDM_READ\n", __func__); |
8dd5cd53 | 541 | rv = clear_wdm_read_flag(desc); |
afba937e | 542 | spin_unlock_irq(&desc->iuspin); |
8dd5cd53 BM |
543 | if (rv < 0) |
544 | goto err; | |
afba937e ON |
545 | goto retry; |
546 | } | |
711c68b3 | 547 | cntr = desc->length; |
afba937e ON |
548 | spin_unlock_irq(&desc->iuspin); |
549 | } | |
550 | ||
711c68b3 BH |
551 | if (cntr > count) |
552 | cntr = count; | |
afba937e ON |
553 | rv = copy_to_user(buffer, desc->ubuf, cntr); |
554 | if (rv > 0) { | |
555 | rv = -EFAULT; | |
556 | goto err; | |
557 | } | |
558 | ||
711c68b3 BH |
559 | spin_lock_irq(&desc->iuspin); |
560 | ||
afba937e ON |
561 | for (i = 0; i < desc->length - cntr; i++) |
562 | desc->ubuf[i] = desc->ubuf[i + cntr]; | |
563 | ||
564 | desc->length -= cntr; | |
87d65e54 | 565 | /* in case we had outstanding data */ |
8dd5cd53 BM |
566 | if (!desc->length) |
567 | clear_wdm_read_flag(desc); | |
568 | spin_unlock_irq(&desc->iuspin); | |
afba937e ON |
569 | rv = cntr; |
570 | ||
571 | err: | |
e8537bd2 | 572 | mutex_unlock(&desc->rlock); |
afba937e ON |
573 | return rv; |
574 | } | |
575 | ||
576 | static int wdm_flush(struct file *file, fl_owner_t id) | |
577 | { | |
578 | struct wdm_device *desc = file->private_data; | |
579 | ||
580 | wait_event(desc->wait, !test_bit(WDM_IN_USE, &desc->flags)); | |
6b0b79d3 BM |
581 | |
582 | /* cannot dereference desc->intf if WDM_DISCONNECTING */ | |
583 | if (desc->werr < 0 && !test_bit(WDM_DISCONNECTING, &desc->flags)) | |
9908a32e GKH |
584 | dev_err(&desc->intf->dev, "Error in flush path: %d\n", |
585 | desc->werr); | |
afba937e | 586 | |
24a85bae | 587 | return usb_translate_errors(desc->werr); |
afba937e ON |
588 | } |
589 | ||
590 | static unsigned int wdm_poll(struct file *file, struct poll_table_struct *wait) | |
591 | { | |
592 | struct wdm_device *desc = file->private_data; | |
593 | unsigned long flags; | |
594 | unsigned int mask = 0; | |
595 | ||
596 | spin_lock_irqsave(&desc->iuspin, flags); | |
597 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
616b6937 | 598 | mask = POLLHUP | POLLERR; |
afba937e ON |
599 | spin_unlock_irqrestore(&desc->iuspin, flags); |
600 | goto desc_out; | |
601 | } | |
602 | if (test_bit(WDM_READ, &desc->flags)) | |
603 | mask = POLLIN | POLLRDNORM; | |
604 | if (desc->rerr || desc->werr) | |
605 | mask |= POLLERR; | |
606 | if (!test_bit(WDM_IN_USE, &desc->flags)) | |
607 | mask |= POLLOUT | POLLWRNORM; | |
608 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
609 | ||
610 | poll_wait(file, &desc->wait, wait); | |
611 | ||
612 | desc_out: | |
613 | return mask; | |
614 | } | |
615 | ||
616 | static int wdm_open(struct inode *inode, struct file *file) | |
617 | { | |
618 | int minor = iminor(inode); | |
619 | int rv = -ENODEV; | |
620 | struct usb_interface *intf; | |
621 | struct wdm_device *desc; | |
622 | ||
623 | mutex_lock(&wdm_mutex); | |
b0c13860 BM |
624 | desc = wdm_find_device_by_minor(minor); |
625 | if (!desc) | |
afba937e ON |
626 | goto out; |
627 | ||
b0c13860 | 628 | intf = desc->intf; |
afba937e ON |
629 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) |
630 | goto out; | |
afba937e ON |
631 | file->private_data = desc; |
632 | ||
17d80d56 | 633 | rv = usb_autopm_get_interface(desc->intf); |
afba937e | 634 | if (rv < 0) { |
9908a32e | 635 | dev_err(&desc->intf->dev, "Error autopm - %d\n", rv); |
afba937e ON |
636 | goto out; |
637 | } | |
afba937e | 638 | |
e8537bd2 BM |
639 | /* using write lock to protect desc->count */ |
640 | mutex_lock(&desc->wlock); | |
17d80d56 | 641 | if (!desc->count++) { |
d771d8aa ON |
642 | desc->werr = 0; |
643 | desc->rerr = 0; | |
17d80d56 ON |
644 | rv = usb_submit_urb(desc->validity, GFP_KERNEL); |
645 | if (rv < 0) { | |
646 | desc->count--; | |
9908a32e GKH |
647 | dev_err(&desc->intf->dev, |
648 | "Error submitting int urb - %d\n", rv); | |
12a98b2b | 649 | rv = usb_translate_errors(rv); |
17d80d56 ON |
650 | } |
651 | } else { | |
652 | rv = 0; | |
653 | } | |
e8537bd2 | 654 | mutex_unlock(&desc->wlock); |
3cc36157 BM |
655 | if (desc->count == 1) |
656 | desc->manage_power(intf, 1); | |
17d80d56 | 657 | usb_autopm_put_interface(desc->intf); |
afba937e ON |
658 | out: |
659 | mutex_unlock(&wdm_mutex); | |
660 | return rv; | |
661 | } | |
662 | ||
663 | static int wdm_release(struct inode *inode, struct file *file) | |
664 | { | |
665 | struct wdm_device *desc = file->private_data; | |
666 | ||
667 | mutex_lock(&wdm_mutex); | |
e8537bd2 BM |
668 | |
669 | /* using write lock to protect desc->count */ | |
670 | mutex_lock(&desc->wlock); | |
afba937e | 671 | desc->count--; |
e8537bd2 | 672 | mutex_unlock(&desc->wlock); |
17d80d56 | 673 | |
afba937e | 674 | if (!desc->count) { |
880bca3a | 675 | if (!test_bit(WDM_DISCONNECTING, &desc->flags)) { |
6b0b79d3 BM |
676 | dev_dbg(&desc->intf->dev, "wdm_release: cleanup"); |
677 | kill_urbs(desc); | |
73e06865 GS |
678 | spin_lock_irq(&desc->iuspin); |
679 | desc->resp_count = 0; | |
680 | spin_unlock_irq(&desc->iuspin); | |
3cc36157 | 681 | desc->manage_power(desc->intf, 0); |
880bca3a | 682 | } else { |
6b0b79d3 BM |
683 | /* must avoid dev_printk here as desc->intf is invalid */ |
684 | pr_debug(KBUILD_MODNAME " %s: device gone - cleaning up\n", __func__); | |
2f338c8a | 685 | cleanup(desc); |
880bca3a | 686 | } |
afba937e ON |
687 | } |
688 | mutex_unlock(&wdm_mutex); | |
689 | return 0; | |
690 | } | |
691 | ||
3edce1cf BM |
692 | static long wdm_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
693 | { | |
694 | struct wdm_device *desc = file->private_data; | |
695 | int rv = 0; | |
696 | ||
697 | switch (cmd) { | |
698 | case IOCTL_WDM_MAX_COMMAND: | |
699 | if (copy_to_user((void __user *)arg, &desc->wMaxCommand, sizeof(desc->wMaxCommand))) | |
700 | rv = -EFAULT; | |
701 | break; | |
702 | default: | |
703 | rv = -ENOTTY; | |
704 | } | |
705 | return rv; | |
706 | } | |
707 | ||
afba937e ON |
708 | static const struct file_operations wdm_fops = { |
709 | .owner = THIS_MODULE, | |
710 | .read = wdm_read, | |
711 | .write = wdm_write, | |
712 | .open = wdm_open, | |
713 | .flush = wdm_flush, | |
714 | .release = wdm_release, | |
6038f373 | 715 | .poll = wdm_poll, |
3edce1cf BM |
716 | .unlocked_ioctl = wdm_ioctl, |
717 | .compat_ioctl = wdm_ioctl, | |
6038f373 | 718 | .llseek = noop_llseek, |
afba937e ON |
719 | }; |
720 | ||
721 | static struct usb_class_driver wdm_class = { | |
722 | .name = "cdc-wdm%d", | |
723 | .fops = &wdm_fops, | |
724 | .minor_base = WDM_MINOR_BASE, | |
725 | }; | |
726 | ||
727 | /* --- error handling --- */ | |
728 | static void wdm_rxwork(struct work_struct *work) | |
729 | { | |
730 | struct wdm_device *desc = container_of(work, struct wdm_device, rxwork); | |
731 | unsigned long flags; | |
6dd433e6 ON |
732 | int rv = 0; |
733 | int responding; | |
afba937e ON |
734 | |
735 | spin_lock_irqsave(&desc->iuspin, flags); | |
736 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
737 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
738 | } else { | |
6dd433e6 | 739 | responding = test_and_set_bit(WDM_RESPONDING, &desc->flags); |
afba937e | 740 | spin_unlock_irqrestore(&desc->iuspin, flags); |
6dd433e6 ON |
741 | if (!responding) |
742 | rv = usb_submit_urb(desc->response, GFP_KERNEL); | |
afba937e ON |
743 | if (rv < 0 && rv != -EPERM) { |
744 | spin_lock_irqsave(&desc->iuspin, flags); | |
6dd433e6 | 745 | clear_bit(WDM_RESPONDING, &desc->flags); |
afba937e ON |
746 | if (!test_bit(WDM_DISCONNECTING, &desc->flags)) |
747 | schedule_work(&desc->rxwork); | |
748 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
749 | } | |
750 | } | |
751 | } | |
752 | ||
753 | /* --- hotplug --- */ | |
754 | ||
3cc36157 BM |
755 | static int wdm_create(struct usb_interface *intf, struct usb_endpoint_descriptor *ep, |
756 | u16 bufsize, int (*manage_power)(struct usb_interface *, int)) | |
afba937e | 757 | { |
0dffb486 | 758 | int rv = -ENOMEM; |
afba937e | 759 | struct wdm_device *desc; |
afba937e | 760 | |
afba937e ON |
761 | desc = kzalloc(sizeof(struct wdm_device), GFP_KERNEL); |
762 | if (!desc) | |
763 | goto out; | |
b0c13860 | 764 | INIT_LIST_HEAD(&desc->device_list); |
e8537bd2 BM |
765 | mutex_init(&desc->rlock); |
766 | mutex_init(&desc->wlock); | |
afba937e ON |
767 | spin_lock_init(&desc->iuspin); |
768 | init_waitqueue_head(&desc->wait); | |
0dffb486 | 769 | desc->wMaxCommand = bufsize; |
052fbc0d | 770 | /* this will be expanded and needed in hardware endianness */ |
afba937e ON |
771 | desc->inum = cpu_to_le16((u16)intf->cur_altsetting->desc.bInterfaceNumber); |
772 | desc->intf = intf; | |
773 | INIT_WORK(&desc->rxwork, wdm_rxwork); | |
774 | ||
052fbc0d | 775 | rv = -EINVAL; |
0dffb486 | 776 | if (!usb_endpoint_is_int_in(ep)) |
afba937e | 777 | goto err; |
afba937e | 778 | |
29cc8897 | 779 | desc->wMaxPacketSize = usb_endpoint_maxp(ep); |
afba937e ON |
780 | |
781 | desc->orq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); | |
782 | if (!desc->orq) | |
783 | goto err; | |
784 | desc->irq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); | |
785 | if (!desc->irq) | |
786 | goto err; | |
787 | ||
788 | desc->validity = usb_alloc_urb(0, GFP_KERNEL); | |
789 | if (!desc->validity) | |
790 | goto err; | |
791 | ||
792 | desc->response = usb_alloc_urb(0, GFP_KERNEL); | |
793 | if (!desc->response) | |
794 | goto err; | |
795 | ||
796 | desc->command = usb_alloc_urb(0, GFP_KERNEL); | |
797 | if (!desc->command) | |
798 | goto err; | |
799 | ||
800 | desc->ubuf = kmalloc(desc->wMaxCommand, GFP_KERNEL); | |
801 | if (!desc->ubuf) | |
802 | goto err; | |
803 | ||
8457d99c | 804 | desc->sbuf = kmalloc(desc->wMaxPacketSize, GFP_KERNEL); |
afba937e ON |
805 | if (!desc->sbuf) |
806 | goto err; | |
807 | ||
8457d99c | 808 | desc->inbuf = kmalloc(desc->wMaxCommand, GFP_KERNEL); |
afba937e | 809 | if (!desc->inbuf) |
8457d99c | 810 | goto err; |
afba937e ON |
811 | |
812 | usb_fill_int_urb( | |
813 | desc->validity, | |
814 | interface_to_usbdev(intf), | |
815 | usb_rcvintpipe(interface_to_usbdev(intf), ep->bEndpointAddress), | |
816 | desc->sbuf, | |
817 | desc->wMaxPacketSize, | |
818 | wdm_int_callback, | |
819 | desc, | |
820 | ep->bInterval | |
821 | ); | |
afba937e | 822 | |
19b85b3b BM |
823 | desc->irq->bRequestType = (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE); |
824 | desc->irq->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE; | |
825 | desc->irq->wValue = 0; | |
323ece54 | 826 | desc->irq->wIndex = desc->inum; /* already converted */ |
19b85b3b BM |
827 | desc->irq->wLength = cpu_to_le16(desc->wMaxCommand); |
828 | ||
829 | usb_fill_control_urb( | |
830 | desc->response, | |
8143a896 | 831 | interface_to_usbdev(intf), |
19b85b3b BM |
832 | /* using common endpoint 0 */ |
833 | usb_rcvctrlpipe(interface_to_usbdev(desc->intf), 0), | |
834 | (unsigned char *)desc->irq, | |
835 | desc->inbuf, | |
836 | desc->wMaxCommand, | |
837 | wdm_in_callback, | |
838 | desc | |
839 | ); | |
19b85b3b | 840 | |
3cc36157 BM |
841 | desc->manage_power = manage_power; |
842 | ||
b0c13860 BM |
843 | spin_lock(&wdm_device_list_lock); |
844 | list_add(&desc->device_list, &wdm_device_list); | |
845 | spin_unlock(&wdm_device_list_lock); | |
846 | ||
afba937e | 847 | rv = usb_register_dev(intf, &wdm_class); |
afba937e | 848 | if (rv < 0) |
b0c13860 | 849 | goto err; |
052fbc0d | 850 | else |
820c629a | 851 | dev_info(&intf->dev, "%s: USB WDM device\n", dev_name(intf->usb_dev)); |
afba937e ON |
852 | out: |
853 | return rv; | |
afba937e | 854 | err: |
6286d85e BM |
855 | spin_lock(&wdm_device_list_lock); |
856 | list_del(&desc->device_list); | |
857 | spin_unlock(&wdm_device_list_lock); | |
0dffb486 BM |
858 | cleanup(desc); |
859 | return rv; | |
860 | } | |
861 | ||
3cc36157 BM |
862 | static int wdm_manage_power(struct usb_interface *intf, int on) |
863 | { | |
864 | /* need autopm_get/put here to ensure the usbcore sees the new value */ | |
865 | int rv = usb_autopm_get_interface(intf); | |
3cc36157 BM |
866 | |
867 | intf->needs_remote_wakeup = on; | |
4144bc86 BM |
868 | if (!rv) |
869 | usb_autopm_put_interface(intf); | |
870 | return 0; | |
3cc36157 BM |
871 | } |
872 | ||
0dffb486 BM |
873 | static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) |
874 | { | |
875 | int rv = -EINVAL; | |
876 | struct usb_host_interface *iface; | |
877 | struct usb_endpoint_descriptor *ep; | |
878 | struct usb_cdc_dmm_desc *dmhd; | |
879 | u8 *buffer = intf->altsetting->extra; | |
880 | int buflen = intf->altsetting->extralen; | |
881 | u16 maxcom = WDM_DEFAULT_BUFSIZE; | |
882 | ||
883 | if (!buffer) | |
884 | goto err; | |
885 | while (buflen > 2) { | |
886 | if (buffer[1] != USB_DT_CS_INTERFACE) { | |
887 | dev_err(&intf->dev, "skipping garbage\n"); | |
888 | goto next_desc; | |
889 | } | |
890 | ||
891 | switch (buffer[2]) { | |
892 | case USB_CDC_HEADER_TYPE: | |
893 | break; | |
894 | case USB_CDC_DMM_TYPE: | |
895 | dmhd = (struct usb_cdc_dmm_desc *)buffer; | |
896 | maxcom = le16_to_cpu(dmhd->wMaxCommand); | |
897 | dev_dbg(&intf->dev, | |
898 | "Finding maximum buffer length: %d", maxcom); | |
899 | break; | |
900 | default: | |
901 | dev_err(&intf->dev, | |
902 | "Ignoring extra header, type %d, length %d\n", | |
903 | buffer[2], buffer[0]); | |
904 | break; | |
905 | } | |
906 | next_desc: | |
907 | buflen -= buffer[0]; | |
908 | buffer += buffer[0]; | |
909 | } | |
910 | ||
911 | iface = intf->cur_altsetting; | |
912 | if (iface->desc.bNumEndpoints != 1) | |
913 | goto err; | |
914 | ep = &iface->endpoint[0].desc; | |
915 | ||
3cc36157 | 916 | rv = wdm_create(intf, ep, maxcom, &wdm_manage_power); |
0dffb486 BM |
917 | |
918 | err: | |
afba937e ON |
919 | return rv; |
920 | } | |
921 | ||
3cc36157 BM |
922 | /** |
923 | * usb_cdc_wdm_register - register a WDM subdriver | |
924 | * @intf: usb interface the subdriver will associate with | |
925 | * @ep: interrupt endpoint to monitor for notifications | |
926 | * @bufsize: maximum message size to support for read/write | |
927 | * | |
928 | * Create WDM usb class character device and associate it with intf | |
929 | * without binding, allowing another driver to manage the interface. | |
930 | * | |
931 | * The subdriver will manage the given interrupt endpoint exclusively | |
932 | * and will issue control requests referring to the given intf. It | |
933 | * will otherwise avoid interferring, and in particular not do | |
934 | * usb_set_intfdata/usb_get_intfdata on intf. | |
935 | * | |
936 | * The return value is a pointer to the subdriver's struct usb_driver. | |
937 | * The registering driver is responsible for calling this subdriver's | |
938 | * disconnect, suspend, resume, pre_reset and post_reset methods from | |
939 | * its own. | |
940 | */ | |
941 | struct usb_driver *usb_cdc_wdm_register(struct usb_interface *intf, | |
942 | struct usb_endpoint_descriptor *ep, | |
943 | int bufsize, | |
944 | int (*manage_power)(struct usb_interface *, int)) | |
945 | { | |
946 | int rv = -EINVAL; | |
947 | ||
948 | rv = wdm_create(intf, ep, bufsize, manage_power); | |
949 | if (rv < 0) | |
950 | goto err; | |
951 | ||
952 | return &wdm_driver; | |
953 | err: | |
954 | return ERR_PTR(rv); | |
955 | } | |
956 | EXPORT_SYMBOL(usb_cdc_wdm_register); | |
957 | ||
afba937e ON |
958 | static void wdm_disconnect(struct usb_interface *intf) |
959 | { | |
960 | struct wdm_device *desc; | |
961 | unsigned long flags; | |
962 | ||
963 | usb_deregister_dev(intf, &wdm_class); | |
b0c13860 | 964 | desc = wdm_find_device(intf); |
afba937e | 965 | mutex_lock(&wdm_mutex); |
afba937e ON |
966 | |
967 | /* the spinlock makes sure no new urbs are generated in the callbacks */ | |
968 | spin_lock_irqsave(&desc->iuspin, flags); | |
969 | set_bit(WDM_DISCONNECTING, &desc->flags); | |
970 | set_bit(WDM_READ, &desc->flags); | |
17d80d56 | 971 | /* to terminate pending flushes */ |
afba937e ON |
972 | clear_bit(WDM_IN_USE, &desc->flags); |
973 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
62aaf24d | 974 | wake_up_all(&desc->wait); |
e8537bd2 BM |
975 | mutex_lock(&desc->rlock); |
976 | mutex_lock(&desc->wlock); | |
afba937e | 977 | kill_urbs(desc); |
d93d16e9 | 978 | cancel_work_sync(&desc->rxwork); |
e8537bd2 BM |
979 | mutex_unlock(&desc->wlock); |
980 | mutex_unlock(&desc->rlock); | |
6286d85e BM |
981 | |
982 | /* the desc->intf pointer used as list key is now invalid */ | |
983 | spin_lock(&wdm_device_list_lock); | |
984 | list_del(&desc->device_list); | |
985 | spin_unlock(&wdm_device_list_lock); | |
986 | ||
afba937e ON |
987 | if (!desc->count) |
988 | cleanup(desc); | |
880bca3a BM |
989 | else |
990 | dev_dbg(&intf->dev, "%s: %d open files - postponing cleanup\n", __func__, desc->count); | |
afba937e ON |
991 | mutex_unlock(&wdm_mutex); |
992 | } | |
993 | ||
d93d16e9 | 994 | #ifdef CONFIG_PM |
17d80d56 ON |
995 | static int wdm_suspend(struct usb_interface *intf, pm_message_t message) |
996 | { | |
b0c13860 | 997 | struct wdm_device *desc = wdm_find_device(intf); |
17d80d56 ON |
998 | int rv = 0; |
999 | ||
1000 | dev_dbg(&desc->intf->dev, "wdm%d_suspend\n", intf->minor); | |
1001 | ||
d93d16e9 | 1002 | /* if this is an autosuspend the caller does the locking */ |
e8537bd2 BM |
1003 | if (!PMSG_IS_AUTO(message)) { |
1004 | mutex_lock(&desc->rlock); | |
1005 | mutex_lock(&desc->wlock); | |
1006 | } | |
62e66854 | 1007 | spin_lock_irq(&desc->iuspin); |
d93d16e9 | 1008 | |
5b1b0b81 | 1009 | if (PMSG_IS_AUTO(message) && |
922a5ead ON |
1010 | (test_bit(WDM_IN_USE, &desc->flags) |
1011 | || test_bit(WDM_RESPONDING, &desc->flags))) { | |
62e66854 | 1012 | spin_unlock_irq(&desc->iuspin); |
17d80d56 ON |
1013 | rv = -EBUSY; |
1014 | } else { | |
d93d16e9 | 1015 | |
beb1d35f | 1016 | set_bit(WDM_SUSPENDING, &desc->flags); |
62e66854 | 1017 | spin_unlock_irq(&desc->iuspin); |
d93d16e9 | 1018 | /* callback submits work - order is essential */ |
17d80d56 | 1019 | kill_urbs(desc); |
d93d16e9 | 1020 | cancel_work_sync(&desc->rxwork); |
17d80d56 | 1021 | } |
e8537bd2 BM |
1022 | if (!PMSG_IS_AUTO(message)) { |
1023 | mutex_unlock(&desc->wlock); | |
1024 | mutex_unlock(&desc->rlock); | |
1025 | } | |
17d80d56 ON |
1026 | |
1027 | return rv; | |
1028 | } | |
d93d16e9 | 1029 | #endif |
17d80d56 ON |
1030 | |
1031 | static int recover_from_urb_loss(struct wdm_device *desc) | |
1032 | { | |
1033 | int rv = 0; | |
1034 | ||
1035 | if (desc->count) { | |
1036 | rv = usb_submit_urb(desc->validity, GFP_NOIO); | |
1037 | if (rv < 0) | |
9908a32e GKH |
1038 | dev_err(&desc->intf->dev, |
1039 | "Error resume submitting int urb - %d\n", rv); | |
17d80d56 ON |
1040 | } |
1041 | return rv; | |
1042 | } | |
d93d16e9 ON |
1043 | |
1044 | #ifdef CONFIG_PM | |
17d80d56 ON |
1045 | static int wdm_resume(struct usb_interface *intf) |
1046 | { | |
b0c13860 | 1047 | struct wdm_device *desc = wdm_find_device(intf); |
17d80d56 ON |
1048 | int rv; |
1049 | ||
1050 | dev_dbg(&desc->intf->dev, "wdm%d_resume\n", intf->minor); | |
338124c1 | 1051 | |
beb1d35f | 1052 | clear_bit(WDM_SUSPENDING, &desc->flags); |
62e66854 | 1053 | rv = recover_from_urb_loss(desc); |
338124c1 | 1054 | |
17d80d56 ON |
1055 | return rv; |
1056 | } | |
d93d16e9 | 1057 | #endif |
17d80d56 ON |
1058 | |
1059 | static int wdm_pre_reset(struct usb_interface *intf) | |
1060 | { | |
b0c13860 | 1061 | struct wdm_device *desc = wdm_find_device(intf); |
17d80d56 | 1062 | |
d771d8aa ON |
1063 | /* |
1064 | * we notify everybody using poll of | |
1065 | * an exceptional situation | |
1066 | * must be done before recovery lest a spontaneous | |
1067 | * message from the device is lost | |
1068 | */ | |
1069 | spin_lock_irq(&desc->iuspin); | |
88044202 BM |
1070 | set_bit(WDM_RESETTING, &desc->flags); /* inform read/write */ |
1071 | set_bit(WDM_READ, &desc->flags); /* unblock read */ | |
1072 | clear_bit(WDM_IN_USE, &desc->flags); /* unblock write */ | |
d771d8aa ON |
1073 | desc->rerr = -EINTR; |
1074 | spin_unlock_irq(&desc->iuspin); | |
1075 | wake_up_all(&desc->wait); | |
88044202 BM |
1076 | mutex_lock(&desc->rlock); |
1077 | mutex_lock(&desc->wlock); | |
1078 | kill_urbs(desc); | |
1079 | cancel_work_sync(&desc->rxwork); | |
17d80d56 ON |
1080 | return 0; |
1081 | } | |
1082 | ||
1083 | static int wdm_post_reset(struct usb_interface *intf) | |
1084 | { | |
b0c13860 | 1085 | struct wdm_device *desc = wdm_find_device(intf); |
17d80d56 ON |
1086 | int rv; |
1087 | ||
c0f5ecee | 1088 | clear_bit(WDM_OVERFLOW, &desc->flags); |
88044202 | 1089 | clear_bit(WDM_RESETTING, &desc->flags); |
17d80d56 | 1090 | rv = recover_from_urb_loss(desc); |
e8537bd2 BM |
1091 | mutex_unlock(&desc->wlock); |
1092 | mutex_unlock(&desc->rlock); | |
17d80d56 ON |
1093 | return 0; |
1094 | } | |
1095 | ||
afba937e ON |
1096 | static struct usb_driver wdm_driver = { |
1097 | .name = "cdc_wdm", | |
1098 | .probe = wdm_probe, | |
1099 | .disconnect = wdm_disconnect, | |
d93d16e9 | 1100 | #ifdef CONFIG_PM |
17d80d56 ON |
1101 | .suspend = wdm_suspend, |
1102 | .resume = wdm_resume, | |
1103 | .reset_resume = wdm_resume, | |
d93d16e9 | 1104 | #endif |
17d80d56 ON |
1105 | .pre_reset = wdm_pre_reset, |
1106 | .post_reset = wdm_post_reset, | |
afba937e | 1107 | .id_table = wdm_ids, |
17d80d56 | 1108 | .supports_autosuspend = 1, |
e1f12eb6 | 1109 | .disable_hub_initiated_lpm = 1, |
afba937e ON |
1110 | }; |
1111 | ||
65db4305 | 1112 | module_usb_driver(wdm_driver); |
afba937e ON |
1113 | |
1114 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
87d65e54 | 1115 | MODULE_DESCRIPTION(DRIVER_DESC); |
afba937e | 1116 | MODULE_LICENSE("GPL"); |