Commit | Line | Data |
---|---|---|
5fd54ace | 1 | // SPDX-License-Identifier: GPL-2.0 |
afba937e ON |
2 | /* |
3 | * cdc-wdm.c | |
4 | * | |
5 | * This driver supports USB CDC WCM Device Management. | |
6 | * | |
052fbc0d | 7 | * Copyright (c) 2007-2009 Oliver Neukum |
afba937e ON |
8 | * |
9 | * Some code taken from cdc-acm.c | |
10 | * | |
11 | * Released under the GPLv2. | |
12 | * | |
13 | * Many thanks to Carl Nordbeck | |
14 | */ | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/errno.h> | |
3edce1cf | 17 | #include <linux/ioctl.h> |
afba937e ON |
18 | #include <linux/slab.h> |
19 | #include <linux/module.h> | |
afba937e ON |
20 | #include <linux/mutex.h> |
21 | #include <linux/uaccess.h> | |
22 | #include <linux/bitops.h> | |
23 | #include <linux/poll.h> | |
24 | #include <linux/usb.h> | |
25 | #include <linux/usb/cdc.h> | |
26 | #include <asm/byteorder.h> | |
27 | #include <asm/unaligned.h> | |
3cc36157 | 28 | #include <linux/usb/cdc-wdm.h> |
afba937e | 29 | |
afba937e | 30 | #define DRIVER_AUTHOR "Oliver Neukum" |
87d65e54 | 31 | #define DRIVER_DESC "USB Abstract Control Model driver for USB WCM Device Management" |
afba937e | 32 | |
6ef4852b | 33 | static const struct usb_device_id wdm_ids[] = { |
afba937e ON |
34 | { |
35 | .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS | | |
36 | USB_DEVICE_ID_MATCH_INT_SUBCLASS, | |
37 | .bInterfaceClass = USB_CLASS_COMM, | |
38 | .bInterfaceSubClass = USB_CDC_SUBCLASS_DMM | |
39 | }, | |
40 | { } | |
41 | }; | |
42 | ||
aa5380b9 ON |
43 | MODULE_DEVICE_TABLE (usb, wdm_ids); |
44 | ||
afba937e ON |
45 | #define WDM_MINOR_BASE 176 |
46 | ||
47 | ||
48 | #define WDM_IN_USE 1 | |
49 | #define WDM_DISCONNECTING 2 | |
50 | #define WDM_RESULT 3 | |
51 | #define WDM_READ 4 | |
52 | #define WDM_INT_STALL 5 | |
53 | #define WDM_POLL_RUNNING 6 | |
922a5ead | 54 | #define WDM_RESPONDING 7 |
beb1d35f | 55 | #define WDM_SUSPENDING 8 |
88044202 | 56 | #define WDM_RESETTING 9 |
c0f5ecee | 57 | #define WDM_OVERFLOW 10 |
afba937e ON |
58 | |
59 | #define WDM_MAX 16 | |
60 | ||
7e3054a0 BM |
61 | /* CDC-WMC r1.1 requires wMaxCommand to be "at least 256 decimal (0x100)" */ |
62 | #define WDM_DEFAULT_BUFSIZE 256 | |
afba937e ON |
63 | |
64 | static DEFINE_MUTEX(wdm_mutex); | |
b0c13860 BM |
65 | static DEFINE_SPINLOCK(wdm_device_list_lock); |
66 | static LIST_HEAD(wdm_device_list); | |
afba937e ON |
67 | |
68 | /* --- method tables --- */ | |
69 | ||
70 | struct wdm_device { | |
71 | u8 *inbuf; /* buffer for response */ | |
72 | u8 *outbuf; /* buffer for command */ | |
73 | u8 *sbuf; /* buffer for status */ | |
74 | u8 *ubuf; /* buffer for copy to user space */ | |
75 | ||
76 | struct urb *command; | |
77 | struct urb *response; | |
78 | struct urb *validity; | |
79 | struct usb_interface *intf; | |
80 | struct usb_ctrlrequest *orq; | |
81 | struct usb_ctrlrequest *irq; | |
82 | spinlock_t iuspin; | |
83 | ||
84 | unsigned long flags; | |
85 | u16 bufsize; | |
86 | u16 wMaxCommand; | |
87 | u16 wMaxPacketSize; | |
afba937e ON |
88 | __le16 inum; |
89 | int reslength; | |
90 | int length; | |
91 | int read; | |
92 | int count; | |
93 | dma_addr_t shandle; | |
94 | dma_addr_t ihandle; | |
e8537bd2 BM |
95 | struct mutex wlock; |
96 | struct mutex rlock; | |
afba937e ON |
97 | wait_queue_head_t wait; |
98 | struct work_struct rxwork; | |
99 | int werr; | |
100 | int rerr; | |
73e06865 | 101 | int resp_count; |
b0c13860 BM |
102 | |
103 | struct list_head device_list; | |
3cc36157 | 104 | int (*manage_power)(struct usb_interface *, int); |
afba937e ON |
105 | }; |
106 | ||
107 | static struct usb_driver wdm_driver; | |
108 | ||
b0c13860 BM |
109 | /* return intfdata if we own the interface, else look up intf in the list */ |
110 | static struct wdm_device *wdm_find_device(struct usb_interface *intf) | |
111 | { | |
6a448868 | 112 | struct wdm_device *desc; |
b0c13860 BM |
113 | |
114 | spin_lock(&wdm_device_list_lock); | |
115 | list_for_each_entry(desc, &wdm_device_list, device_list) | |
116 | if (desc->intf == intf) | |
6a448868 BM |
117 | goto found; |
118 | desc = NULL; | |
119 | found: | |
b0c13860 BM |
120 | spin_unlock(&wdm_device_list_lock); |
121 | ||
122 | return desc; | |
123 | } | |
124 | ||
125 | static struct wdm_device *wdm_find_device_by_minor(int minor) | |
126 | { | |
6a448868 | 127 | struct wdm_device *desc; |
b0c13860 BM |
128 | |
129 | spin_lock(&wdm_device_list_lock); | |
130 | list_for_each_entry(desc, &wdm_device_list, device_list) | |
131 | if (desc->intf->minor == minor) | |
6a448868 BM |
132 | goto found; |
133 | desc = NULL; | |
134 | found: | |
b0c13860 BM |
135 | spin_unlock(&wdm_device_list_lock); |
136 | ||
137 | return desc; | |
138 | } | |
139 | ||
afba937e ON |
140 | /* --- callbacks --- */ |
141 | static void wdm_out_callback(struct urb *urb) | |
142 | { | |
143 | struct wdm_device *desc; | |
144 | desc = urb->context; | |
145 | spin_lock(&desc->iuspin); | |
146 | desc->werr = urb->status; | |
147 | spin_unlock(&desc->iuspin); | |
afba937e | 148 | kfree(desc->outbuf); |
5c22837a ON |
149 | desc->outbuf = NULL; |
150 | clear_bit(WDM_IN_USE, &desc->flags); | |
afba937e ON |
151 | wake_up(&desc->wait); |
152 | } | |
153 | ||
c1da59da RF |
154 | /* forward declaration */ |
155 | static int service_outstanding_interrupt(struct wdm_device *desc); | |
156 | ||
afba937e ON |
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, | |
ce8bb344 | 170 | "nonzero urb status received: -ENOENT\n"); |
922a5ead | 171 | goto skip_error; |
afba937e ON |
172 | case -ECONNRESET: |
173 | dev_dbg(&desc->intf->dev, | |
ce8bb344 | 174 | "nonzero urb status received: -ECONNRESET\n"); |
922a5ead | 175 | goto skip_error; |
afba937e ON |
176 | case -ESHUTDOWN: |
177 | dev_dbg(&desc->intf->dev, | |
ce8bb344 | 178 | "nonzero urb status received: -ESHUTDOWN\n"); |
922a5ead | 179 | goto skip_error; |
afba937e | 180 | case -EPIPE: |
19445816 | 181 | dev_err(&desc->intf->dev, |
9908a32e | 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 | ||
c1da59da RF |
191 | /* |
192 | * only set a new error if there is no previous error. | |
193 | * Errors are only cleared during read/open | |
8fec9355 BM |
194 | * Avoid propagating -EPIPE (stall) to userspace since it is |
195 | * better handled as an empty read | |
c1da59da | 196 | */ |
8fec9355 | 197 | if (desc->rerr == 0 && status != -EPIPE) |
c1da59da RF |
198 | desc->rerr = status; |
199 | ||
c0f5ecee ON |
200 | if (length + desc->length > desc->wMaxCommand) { |
201 | /* The buffer would overflow */ | |
202 | set_bit(WDM_OVERFLOW, &desc->flags); | |
203 | } else { | |
204 | /* we may already be in overflow */ | |
205 | if (!test_bit(WDM_OVERFLOW, &desc->flags)) { | |
206 | memmove(desc->ubuf + desc->length, desc->inbuf, length); | |
207 | desc->length += length; | |
208 | desc->reslength = length; | |
209 | } | |
210 | } | |
922a5ead | 211 | skip_error: |
c1da59da | 212 | set_bit(WDM_READ, &desc->flags); |
afba937e ON |
213 | wake_up(&desc->wait); |
214 | ||
c1da59da RF |
215 | if (desc->rerr) { |
216 | /* | |
217 | * Since there was an error, userspace may decide to not read | |
218 | * any data after poll'ing. | |
219 | * We should respond to further attempts from the device to send | |
220 | * data, so that we can get unstuck. | |
221 | */ | |
222 | service_outstanding_interrupt(desc); | |
223 | } | |
224 | ||
afba937e ON |
225 | spin_unlock(&desc->iuspin); |
226 | } | |
227 | ||
228 | static void wdm_int_callback(struct urb *urb) | |
229 | { | |
230 | int rv = 0; | |
6dd433e6 | 231 | int responding; |
afba937e ON |
232 | int status = urb->status; |
233 | struct wdm_device *desc; | |
afba937e ON |
234 | struct usb_cdc_notification *dr; |
235 | ||
236 | desc = urb->context; | |
afba937e ON |
237 | dr = (struct usb_cdc_notification *)desc->sbuf; |
238 | ||
239 | if (status) { | |
240 | switch (status) { | |
241 | case -ESHUTDOWN: | |
242 | case -ENOENT: | |
243 | case -ECONNRESET: | |
244 | return; /* unplug */ | |
245 | case -EPIPE: | |
246 | set_bit(WDM_INT_STALL, &desc->flags); | |
9908a32e | 247 | dev_err(&desc->intf->dev, "Stall on int endpoint\n"); |
afba937e ON |
248 | goto sw; /* halt is cleared in work */ |
249 | default: | |
9908a32e GKH |
250 | dev_err(&desc->intf->dev, |
251 | "nonzero urb status received: %d\n", status); | |
afba937e ON |
252 | break; |
253 | } | |
254 | } | |
255 | ||
256 | if (urb->actual_length < sizeof(struct usb_cdc_notification)) { | |
9908a32e GKH |
257 | dev_err(&desc->intf->dev, "wdm_int_callback - %d bytes\n", |
258 | urb->actual_length); | |
afba937e ON |
259 | goto exit; |
260 | } | |
261 | ||
262 | switch (dr->bNotificationType) { | |
263 | case USB_CDC_NOTIFY_RESPONSE_AVAILABLE: | |
264 | dev_dbg(&desc->intf->dev, | |
ce8bb344 | 265 | "NOTIFY_RESPONSE_AVAILABLE received: index %d len %d\n", |
323ece54 | 266 | le16_to_cpu(dr->wIndex), le16_to_cpu(dr->wLength)); |
afba937e ON |
267 | break; |
268 | ||
269 | case USB_CDC_NOTIFY_NETWORK_CONNECTION: | |
270 | ||
271 | dev_dbg(&desc->intf->dev, | |
ce8bb344 | 272 | "NOTIFY_NETWORK_CONNECTION %s network\n", |
afba937e ON |
273 | dr->wValue ? "connected to" : "disconnected from"); |
274 | goto exit; | |
9983d6dc | 275 | case USB_CDC_NOTIFY_SPEED_CHANGE: |
ce8bb344 | 276 | dev_dbg(&desc->intf->dev, "SPEED_CHANGE received (len %u)\n", |
9983d6dc BM |
277 | urb->actual_length); |
278 | goto exit; | |
afba937e ON |
279 | default: |
280 | clear_bit(WDM_POLL_RUNNING, &desc->flags); | |
9908a32e GKH |
281 | dev_err(&desc->intf->dev, |
282 | "unknown notification %d received: index %d len %d\n", | |
323ece54 ON |
283 | dr->bNotificationType, |
284 | le16_to_cpu(dr->wIndex), | |
285 | le16_to_cpu(dr->wLength)); | |
afba937e ON |
286 | goto exit; |
287 | } | |
288 | ||
afba937e | 289 | spin_lock(&desc->iuspin); |
6dd433e6 | 290 | responding = test_and_set_bit(WDM_RESPONDING, &desc->flags); |
73e06865 GS |
291 | if (!desc->resp_count++ && !responding |
292 | && !test_bit(WDM_DISCONNECTING, &desc->flags) | |
beb1d35f | 293 | && !test_bit(WDM_SUSPENDING, &desc->flags)) { |
afba937e | 294 | rv = usb_submit_urb(desc->response, GFP_ATOMIC); |
ce8bb344 | 295 | dev_dbg(&desc->intf->dev, "submit response URB %d\n", rv); |
afba937e ON |
296 | } |
297 | spin_unlock(&desc->iuspin); | |
298 | if (rv < 0) { | |
922a5ead | 299 | clear_bit(WDM_RESPONDING, &desc->flags); |
afba937e ON |
300 | if (rv == -EPERM) |
301 | return; | |
302 | if (rv == -ENOMEM) { | |
303 | sw: | |
304 | rv = schedule_work(&desc->rxwork); | |
305 | if (rv) | |
9908a32e GKH |
306 | dev_err(&desc->intf->dev, |
307 | "Cannot schedule work\n"); | |
afba937e ON |
308 | } |
309 | } | |
310 | exit: | |
311 | rv = usb_submit_urb(urb, GFP_ATOMIC); | |
312 | if (rv) | |
9908a32e GKH |
313 | dev_err(&desc->intf->dev, |
314 | "%s - usb_submit_urb failed with result %d\n", | |
315 | __func__, rv); | |
afba937e ON |
316 | |
317 | } | |
318 | ||
319 | static void kill_urbs(struct wdm_device *desc) | |
320 | { | |
17d80d56 | 321 | /* the order here is essential */ |
afba937e ON |
322 | usb_kill_urb(desc->command); |
323 | usb_kill_urb(desc->validity); | |
324 | usb_kill_urb(desc->response); | |
325 | } | |
326 | ||
327 | static void free_urbs(struct wdm_device *desc) | |
328 | { | |
329 | usb_free_urb(desc->validity); | |
330 | usb_free_urb(desc->response); | |
331 | usb_free_urb(desc->command); | |
332 | } | |
333 | ||
334 | static void cleanup(struct wdm_device *desc) | |
335 | { | |
8457d99c BM |
336 | kfree(desc->sbuf); |
337 | kfree(desc->inbuf); | |
afba937e ON |
338 | kfree(desc->orq); |
339 | kfree(desc->irq); | |
340 | kfree(desc->ubuf); | |
341 | free_urbs(desc); | |
342 | kfree(desc); | |
343 | } | |
344 | ||
345 | static ssize_t wdm_write | |
346 | (struct file *file, const char __user *buffer, size_t count, loff_t *ppos) | |
347 | { | |
348 | u8 *buf; | |
349 | int rv = -EMSGSIZE, r, we; | |
350 | struct wdm_device *desc = file->private_data; | |
351 | struct usb_ctrlrequest *req; | |
352 | ||
353 | if (count > desc->wMaxCommand) | |
354 | count = desc->wMaxCommand; | |
355 | ||
356 | spin_lock_irq(&desc->iuspin); | |
357 | we = desc->werr; | |
358 | desc->werr = 0; | |
359 | spin_unlock_irq(&desc->iuspin); | |
360 | if (we < 0) | |
76cb03e7 | 361 | return usb_translate_errors(we); |
afba937e | 362 | |
64b9533e GT |
363 | buf = memdup_user(buffer, count); |
364 | if (IS_ERR(buf)) | |
365 | return PTR_ERR(buf); | |
860e41a7 ON |
366 | |
367 | /* concurrent writes and disconnect */ | |
e8537bd2 | 368 | r = mutex_lock_interruptible(&desc->wlock); |
afba937e | 369 | rv = -ERESTARTSYS; |
28965e17 ON |
370 | if (r) |
371 | goto out_free_mem; | |
860e41a7 ON |
372 | |
373 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
860e41a7 | 374 | rv = -ENODEV; |
28965e17 | 375 | goto out_free_mem_lock; |
860e41a7 | 376 | } |
afba937e | 377 | |
17d80d56 | 378 | r = usb_autopm_get_interface(desc->intf); |
860e41a7 | 379 | if (r < 0) { |
12a98b2b | 380 | rv = usb_translate_errors(r); |
28965e17 | 381 | goto out_free_mem_lock; |
860e41a7 | 382 | } |
7f1dc313 | 383 | |
0cdfb819 | 384 | if (!(file->f_flags & O_NONBLOCK)) |
7f1dc313 ON |
385 | r = wait_event_interruptible(desc->wait, !test_bit(WDM_IN_USE, |
386 | &desc->flags)); | |
387 | else | |
388 | if (test_bit(WDM_IN_USE, &desc->flags)) | |
389 | r = -EAGAIN; | |
88044202 BM |
390 | |
391 | if (test_bit(WDM_RESETTING, &desc->flags)) | |
392 | r = -EIO; | |
393 | ||
860e41a7 | 394 | if (r < 0) { |
12a98b2b | 395 | rv = r; |
28965e17 | 396 | goto out_free_mem_pm; |
afba937e ON |
397 | } |
398 | ||
399 | req = desc->orq; | |
400 | usb_fill_control_urb( | |
401 | desc->command, | |
402 | interface_to_usbdev(desc->intf), | |
403 | /* using common endpoint 0 */ | |
404 | usb_sndctrlpipe(interface_to_usbdev(desc->intf), 0), | |
405 | (unsigned char *)req, | |
406 | buf, | |
407 | count, | |
408 | wdm_out_callback, | |
409 | desc | |
410 | ); | |
411 | ||
412 | req->bRequestType = (USB_DIR_OUT | USB_TYPE_CLASS | | |
413 | USB_RECIP_INTERFACE); | |
414 | req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND; | |
415 | req->wValue = 0; | |
323ece54 | 416 | req->wIndex = desc->inum; /* already converted */ |
afba937e ON |
417 | req->wLength = cpu_to_le16(count); |
418 | set_bit(WDM_IN_USE, &desc->flags); | |
5c22837a | 419 | desc->outbuf = buf; |
afba937e ON |
420 | |
421 | rv = usb_submit_urb(desc->command, GFP_KERNEL); | |
422 | if (rv < 0) { | |
5c22837a | 423 | desc->outbuf = NULL; |
afba937e | 424 | clear_bit(WDM_IN_USE, &desc->flags); |
9908a32e | 425 | dev_err(&desc->intf->dev, "Tx URB error: %d\n", rv); |
12a98b2b | 426 | rv = usb_translate_errors(rv); |
28965e17 | 427 | goto out_free_mem_pm; |
afba937e | 428 | } else { |
ce8bb344 | 429 | dev_dbg(&desc->intf->dev, "Tx URB has been submitted index=%d\n", |
323ece54 | 430 | le16_to_cpu(req->wIndex)); |
afba937e | 431 | } |
28965e17 | 432 | |
17d80d56 | 433 | usb_autopm_put_interface(desc->intf); |
e8537bd2 | 434 | mutex_unlock(&desc->wlock); |
64b9533e | 435 | return count; |
28965e17 ON |
436 | |
437 | out_free_mem_pm: | |
438 | usb_autopm_put_interface(desc->intf); | |
439 | out_free_mem_lock: | |
440 | mutex_unlock(&desc->wlock); | |
441 | out_free_mem: | |
442 | kfree(buf); | |
443 | return rv; | |
afba937e ON |
444 | } |
445 | ||
8dd5cd53 | 446 | /* |
c1da59da | 447 | * Submit the read urb if resp_count is non-zero. |
8dd5cd53 BM |
448 | * |
449 | * Called with desc->iuspin locked | |
450 | */ | |
c1da59da | 451 | static int service_outstanding_interrupt(struct wdm_device *desc) |
8dd5cd53 BM |
452 | { |
453 | int rv = 0; | |
454 | ||
8dd5cd53 | 455 | /* submit read urb only if the device is waiting for it */ |
f563926f | 456 | if (!desc->resp_count || !--desc->resp_count) |
8dd5cd53 BM |
457 | goto out; |
458 | ||
459 | set_bit(WDM_RESPONDING, &desc->flags); | |
460 | spin_unlock_irq(&desc->iuspin); | |
461 | rv = usb_submit_urb(desc->response, GFP_KERNEL); | |
462 | spin_lock_irq(&desc->iuspin); | |
463 | if (rv) { | |
464 | dev_err(&desc->intf->dev, | |
465 | "usb_submit_urb failed with result %d\n", rv); | |
466 | ||
467 | /* make sure the next notification trigger a submit */ | |
468 | clear_bit(WDM_RESPONDING, &desc->flags); | |
469 | desc->resp_count = 0; | |
470 | } | |
471 | out: | |
472 | return rv; | |
473 | } | |
474 | ||
afba937e ON |
475 | static ssize_t wdm_read |
476 | (struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
477 | { | |
711c68b3 | 478 | int rv, cntr; |
afba937e ON |
479 | int i = 0; |
480 | struct wdm_device *desc = file->private_data; | |
481 | ||
482 | ||
e8537bd2 | 483 | rv = mutex_lock_interruptible(&desc->rlock); /*concurrent reads */ |
afba937e ON |
484 | if (rv < 0) |
485 | return -ERESTARTSYS; | |
486 | ||
6aa7de05 | 487 | cntr = READ_ONCE(desc->length); |
711c68b3 | 488 | if (cntr == 0) { |
afba937e ON |
489 | desc->read = 0; |
490 | retry: | |
7f1dc313 ON |
491 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { |
492 | rv = -ENODEV; | |
493 | goto err; | |
494 | } | |
c0f5ecee ON |
495 | if (test_bit(WDM_OVERFLOW, &desc->flags)) { |
496 | clear_bit(WDM_OVERFLOW, &desc->flags); | |
497 | rv = -ENOBUFS; | |
498 | goto err; | |
499 | } | |
afba937e | 500 | i++; |
7f1dc313 ON |
501 | if (file->f_flags & O_NONBLOCK) { |
502 | if (!test_bit(WDM_READ, &desc->flags)) { | |
53b7f7b5 | 503 | rv = -EAGAIN; |
7f1dc313 ON |
504 | goto err; |
505 | } | |
506 | rv = 0; | |
507 | } else { | |
508 | rv = wait_event_interruptible(desc->wait, | |
509 | test_bit(WDM_READ, &desc->flags)); | |
510 | } | |
afba937e | 511 | |
7f1dc313 | 512 | /* may have happened while we slept */ |
17d80d56 ON |
513 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { |
514 | rv = -ENODEV; | |
515 | goto err; | |
516 | } | |
88044202 BM |
517 | if (test_bit(WDM_RESETTING, &desc->flags)) { |
518 | rv = -EIO; | |
519 | goto err; | |
520 | } | |
17d80d56 | 521 | usb_mark_last_busy(interface_to_usbdev(desc->intf)); |
afba937e ON |
522 | if (rv < 0) { |
523 | rv = -ERESTARTSYS; | |
524 | goto err; | |
525 | } | |
526 | ||
527 | spin_lock_irq(&desc->iuspin); | |
528 | ||
529 | if (desc->rerr) { /* read completed, error happened */ | |
85e8a0b9 | 530 | rv = usb_translate_errors(desc->rerr); |
afba937e ON |
531 | desc->rerr = 0; |
532 | spin_unlock_irq(&desc->iuspin); | |
afba937e ON |
533 | goto err; |
534 | } | |
535 | /* | |
536 | * recheck whether we've lost the race | |
537 | * against the completion handler | |
538 | */ | |
539 | if (!test_bit(WDM_READ, &desc->flags)) { /* lost race */ | |
540 | spin_unlock_irq(&desc->iuspin); | |
541 | goto retry; | |
542 | } | |
c0f5ecee | 543 | |
afba937e | 544 | if (!desc->reslength) { /* zero length read */ |
ce8bb344 | 545 | dev_dbg(&desc->intf->dev, "zero length - clearing WDM_READ\n"); |
c1da59da RF |
546 | clear_bit(WDM_READ, &desc->flags); |
547 | rv = service_outstanding_interrupt(desc); | |
afba937e | 548 | spin_unlock_irq(&desc->iuspin); |
8dd5cd53 BM |
549 | if (rv < 0) |
550 | goto err; | |
afba937e ON |
551 | goto retry; |
552 | } | |
711c68b3 | 553 | cntr = desc->length; |
afba937e ON |
554 | spin_unlock_irq(&desc->iuspin); |
555 | } | |
556 | ||
711c68b3 BH |
557 | if (cntr > count) |
558 | cntr = count; | |
afba937e ON |
559 | rv = copy_to_user(buffer, desc->ubuf, cntr); |
560 | if (rv > 0) { | |
561 | rv = -EFAULT; | |
562 | goto err; | |
563 | } | |
564 | ||
711c68b3 BH |
565 | spin_lock_irq(&desc->iuspin); |
566 | ||
afba937e ON |
567 | for (i = 0; i < desc->length - cntr; i++) |
568 | desc->ubuf[i] = desc->ubuf[i + cntr]; | |
569 | ||
570 | desc->length -= cntr; | |
87d65e54 | 571 | /* in case we had outstanding data */ |
c1da59da RF |
572 | if (!desc->length) { |
573 | clear_bit(WDM_READ, &desc->flags); | |
574 | service_outstanding_interrupt(desc); | |
575 | } | |
8dd5cd53 | 576 | spin_unlock_irq(&desc->iuspin); |
afba937e ON |
577 | rv = cntr; |
578 | ||
579 | err: | |
e8537bd2 | 580 | mutex_unlock(&desc->rlock); |
afba937e ON |
581 | return rv; |
582 | } | |
583 | ||
584 | static int wdm_flush(struct file *file, fl_owner_t id) | |
585 | { | |
586 | struct wdm_device *desc = file->private_data; | |
587 | ||
588 | wait_event(desc->wait, !test_bit(WDM_IN_USE, &desc->flags)); | |
6b0b79d3 BM |
589 | |
590 | /* cannot dereference desc->intf if WDM_DISCONNECTING */ | |
591 | if (desc->werr < 0 && !test_bit(WDM_DISCONNECTING, &desc->flags)) | |
9908a32e GKH |
592 | dev_err(&desc->intf->dev, "Error in flush path: %d\n", |
593 | desc->werr); | |
afba937e | 594 | |
24a85bae | 595 | return usb_translate_errors(desc->werr); |
afba937e ON |
596 | } |
597 | ||
afc9a42b | 598 | static __poll_t wdm_poll(struct file *file, struct poll_table_struct *wait) |
afba937e ON |
599 | { |
600 | struct wdm_device *desc = file->private_data; | |
601 | unsigned long flags; | |
afc9a42b | 602 | __poll_t mask = 0; |
afba937e ON |
603 | |
604 | spin_lock_irqsave(&desc->iuspin, flags); | |
605 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
a9a08845 | 606 | mask = EPOLLHUP | EPOLLERR; |
afba937e ON |
607 | spin_unlock_irqrestore(&desc->iuspin, flags); |
608 | goto desc_out; | |
609 | } | |
610 | if (test_bit(WDM_READ, &desc->flags)) | |
a9a08845 | 611 | mask = EPOLLIN | EPOLLRDNORM; |
afba937e | 612 | if (desc->rerr || desc->werr) |
a9a08845 | 613 | mask |= EPOLLERR; |
afba937e | 614 | if (!test_bit(WDM_IN_USE, &desc->flags)) |
a9a08845 | 615 | mask |= EPOLLOUT | EPOLLWRNORM; |
afba937e ON |
616 | spin_unlock_irqrestore(&desc->iuspin, flags); |
617 | ||
618 | poll_wait(file, &desc->wait, wait); | |
619 | ||
620 | desc_out: | |
621 | return mask; | |
622 | } | |
623 | ||
624 | static int wdm_open(struct inode *inode, struct file *file) | |
625 | { | |
626 | int minor = iminor(inode); | |
627 | int rv = -ENODEV; | |
628 | struct usb_interface *intf; | |
629 | struct wdm_device *desc; | |
630 | ||
631 | mutex_lock(&wdm_mutex); | |
b0c13860 BM |
632 | desc = wdm_find_device_by_minor(minor); |
633 | if (!desc) | |
afba937e ON |
634 | goto out; |
635 | ||
b0c13860 | 636 | intf = desc->intf; |
afba937e ON |
637 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) |
638 | goto out; | |
afba937e ON |
639 | file->private_data = desc; |
640 | ||
17d80d56 | 641 | rv = usb_autopm_get_interface(desc->intf); |
afba937e | 642 | if (rv < 0) { |
9908a32e | 643 | dev_err(&desc->intf->dev, "Error autopm - %d\n", rv); |
afba937e ON |
644 | goto out; |
645 | } | |
afba937e | 646 | |
e8537bd2 BM |
647 | /* using write lock to protect desc->count */ |
648 | mutex_lock(&desc->wlock); | |
17d80d56 | 649 | if (!desc->count++) { |
d771d8aa ON |
650 | desc->werr = 0; |
651 | desc->rerr = 0; | |
17d80d56 ON |
652 | rv = usb_submit_urb(desc->validity, GFP_KERNEL); |
653 | if (rv < 0) { | |
654 | desc->count--; | |
9908a32e GKH |
655 | dev_err(&desc->intf->dev, |
656 | "Error submitting int urb - %d\n", rv); | |
12a98b2b | 657 | rv = usb_translate_errors(rv); |
17d80d56 ON |
658 | } |
659 | } else { | |
660 | rv = 0; | |
661 | } | |
e8537bd2 | 662 | mutex_unlock(&desc->wlock); |
3cc36157 BM |
663 | if (desc->count == 1) |
664 | desc->manage_power(intf, 1); | |
17d80d56 | 665 | usb_autopm_put_interface(desc->intf); |
afba937e ON |
666 | out: |
667 | mutex_unlock(&wdm_mutex); | |
668 | return rv; | |
669 | } | |
670 | ||
671 | static int wdm_release(struct inode *inode, struct file *file) | |
672 | { | |
673 | struct wdm_device *desc = file->private_data; | |
674 | ||
675 | mutex_lock(&wdm_mutex); | |
e8537bd2 BM |
676 | |
677 | /* using write lock to protect desc->count */ | |
678 | mutex_lock(&desc->wlock); | |
afba937e | 679 | desc->count--; |
e8537bd2 | 680 | mutex_unlock(&desc->wlock); |
17d80d56 | 681 | |
afba937e | 682 | if (!desc->count) { |
880bca3a | 683 | if (!test_bit(WDM_DISCONNECTING, &desc->flags)) { |
ce8bb344 | 684 | dev_dbg(&desc->intf->dev, "wdm_release: cleanup\n"); |
6b0b79d3 | 685 | kill_urbs(desc); |
73e06865 GS |
686 | spin_lock_irq(&desc->iuspin); |
687 | desc->resp_count = 0; | |
688 | spin_unlock_irq(&desc->iuspin); | |
3cc36157 | 689 | desc->manage_power(desc->intf, 0); |
880bca3a | 690 | } else { |
6b0b79d3 BM |
691 | /* must avoid dev_printk here as desc->intf is invalid */ |
692 | pr_debug(KBUILD_MODNAME " %s: device gone - cleaning up\n", __func__); | |
2f338c8a | 693 | cleanup(desc); |
880bca3a | 694 | } |
afba937e ON |
695 | } |
696 | mutex_unlock(&wdm_mutex); | |
697 | return 0; | |
698 | } | |
699 | ||
3edce1cf BM |
700 | static long wdm_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
701 | { | |
702 | struct wdm_device *desc = file->private_data; | |
703 | int rv = 0; | |
704 | ||
705 | switch (cmd) { | |
706 | case IOCTL_WDM_MAX_COMMAND: | |
707 | if (copy_to_user((void __user *)arg, &desc->wMaxCommand, sizeof(desc->wMaxCommand))) | |
708 | rv = -EFAULT; | |
709 | break; | |
710 | default: | |
711 | rv = -ENOTTY; | |
712 | } | |
713 | return rv; | |
714 | } | |
715 | ||
afba937e ON |
716 | static const struct file_operations wdm_fops = { |
717 | .owner = THIS_MODULE, | |
718 | .read = wdm_read, | |
719 | .write = wdm_write, | |
720 | .open = wdm_open, | |
721 | .flush = wdm_flush, | |
722 | .release = wdm_release, | |
6038f373 | 723 | .poll = wdm_poll, |
3edce1cf BM |
724 | .unlocked_ioctl = wdm_ioctl, |
725 | .compat_ioctl = wdm_ioctl, | |
6038f373 | 726 | .llseek = noop_llseek, |
afba937e ON |
727 | }; |
728 | ||
729 | static struct usb_class_driver wdm_class = { | |
730 | .name = "cdc-wdm%d", | |
731 | .fops = &wdm_fops, | |
732 | .minor_base = WDM_MINOR_BASE, | |
733 | }; | |
734 | ||
735 | /* --- error handling --- */ | |
736 | static void wdm_rxwork(struct work_struct *work) | |
737 | { | |
738 | struct wdm_device *desc = container_of(work, struct wdm_device, rxwork); | |
739 | unsigned long flags; | |
6dd433e6 ON |
740 | int rv = 0; |
741 | int responding; | |
afba937e ON |
742 | |
743 | spin_lock_irqsave(&desc->iuspin, flags); | |
744 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
745 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
746 | } else { | |
6dd433e6 | 747 | responding = test_and_set_bit(WDM_RESPONDING, &desc->flags); |
afba937e | 748 | spin_unlock_irqrestore(&desc->iuspin, flags); |
6dd433e6 ON |
749 | if (!responding) |
750 | rv = usb_submit_urb(desc->response, GFP_KERNEL); | |
afba937e ON |
751 | if (rv < 0 && rv != -EPERM) { |
752 | spin_lock_irqsave(&desc->iuspin, flags); | |
6dd433e6 | 753 | clear_bit(WDM_RESPONDING, &desc->flags); |
afba937e ON |
754 | if (!test_bit(WDM_DISCONNECTING, &desc->flags)) |
755 | schedule_work(&desc->rxwork); | |
756 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
757 | } | |
758 | } | |
759 | } | |
760 | ||
761 | /* --- hotplug --- */ | |
762 | ||
3cc36157 | 763 | static int wdm_create(struct usb_interface *intf, struct usb_endpoint_descriptor *ep, |
19445816 | 764 | u16 bufsize, int (*manage_power)(struct usb_interface *, int)) |
afba937e | 765 | { |
0dffb486 | 766 | int rv = -ENOMEM; |
afba937e | 767 | struct wdm_device *desc; |
afba937e | 768 | |
afba937e ON |
769 | desc = kzalloc(sizeof(struct wdm_device), GFP_KERNEL); |
770 | if (!desc) | |
771 | goto out; | |
b0c13860 | 772 | INIT_LIST_HEAD(&desc->device_list); |
e8537bd2 BM |
773 | mutex_init(&desc->rlock); |
774 | mutex_init(&desc->wlock); | |
afba937e ON |
775 | spin_lock_init(&desc->iuspin); |
776 | init_waitqueue_head(&desc->wait); | |
0dffb486 | 777 | desc->wMaxCommand = bufsize; |
052fbc0d | 778 | /* this will be expanded and needed in hardware endianness */ |
afba937e ON |
779 | desc->inum = cpu_to_le16((u16)intf->cur_altsetting->desc.bInterfaceNumber); |
780 | desc->intf = intf; | |
781 | INIT_WORK(&desc->rxwork, wdm_rxwork); | |
782 | ||
052fbc0d | 783 | rv = -EINVAL; |
0dffb486 | 784 | if (!usb_endpoint_is_int_in(ep)) |
afba937e | 785 | goto err; |
afba937e | 786 | |
29cc8897 | 787 | desc->wMaxPacketSize = usb_endpoint_maxp(ep); |
afba937e ON |
788 | |
789 | desc->orq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); | |
790 | if (!desc->orq) | |
791 | goto err; | |
792 | desc->irq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); | |
793 | if (!desc->irq) | |
794 | goto err; | |
795 | ||
796 | desc->validity = usb_alloc_urb(0, GFP_KERNEL); | |
797 | if (!desc->validity) | |
798 | goto err; | |
799 | ||
800 | desc->response = usb_alloc_urb(0, GFP_KERNEL); | |
801 | if (!desc->response) | |
802 | goto err; | |
803 | ||
804 | desc->command = usb_alloc_urb(0, GFP_KERNEL); | |
805 | if (!desc->command) | |
806 | goto err; | |
807 | ||
808 | desc->ubuf = kmalloc(desc->wMaxCommand, GFP_KERNEL); | |
809 | if (!desc->ubuf) | |
810 | goto err; | |
811 | ||
8457d99c | 812 | desc->sbuf = kmalloc(desc->wMaxPacketSize, GFP_KERNEL); |
afba937e ON |
813 | if (!desc->sbuf) |
814 | goto err; | |
815 | ||
8457d99c | 816 | desc->inbuf = kmalloc(desc->wMaxCommand, GFP_KERNEL); |
afba937e | 817 | if (!desc->inbuf) |
8457d99c | 818 | goto err; |
afba937e ON |
819 | |
820 | usb_fill_int_urb( | |
821 | desc->validity, | |
822 | interface_to_usbdev(intf), | |
823 | usb_rcvintpipe(interface_to_usbdev(intf), ep->bEndpointAddress), | |
824 | desc->sbuf, | |
825 | desc->wMaxPacketSize, | |
826 | wdm_int_callback, | |
827 | desc, | |
828 | ep->bInterval | |
829 | ); | |
afba937e | 830 | |
19b85b3b BM |
831 | desc->irq->bRequestType = (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE); |
832 | desc->irq->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE; | |
833 | desc->irq->wValue = 0; | |
323ece54 | 834 | desc->irq->wIndex = desc->inum; /* already converted */ |
19b85b3b BM |
835 | desc->irq->wLength = cpu_to_le16(desc->wMaxCommand); |
836 | ||
837 | usb_fill_control_urb( | |
838 | desc->response, | |
8143a896 | 839 | interface_to_usbdev(intf), |
19b85b3b BM |
840 | /* using common endpoint 0 */ |
841 | usb_rcvctrlpipe(interface_to_usbdev(desc->intf), 0), | |
842 | (unsigned char *)desc->irq, | |
843 | desc->inbuf, | |
844 | desc->wMaxCommand, | |
845 | wdm_in_callback, | |
846 | desc | |
847 | ); | |
19b85b3b | 848 | |
3cc36157 BM |
849 | desc->manage_power = manage_power; |
850 | ||
b0c13860 BM |
851 | spin_lock(&wdm_device_list_lock); |
852 | list_add(&desc->device_list, &wdm_device_list); | |
853 | spin_unlock(&wdm_device_list_lock); | |
854 | ||
afba937e | 855 | rv = usb_register_dev(intf, &wdm_class); |
afba937e | 856 | if (rv < 0) |
b0c13860 | 857 | goto err; |
052fbc0d | 858 | else |
820c629a | 859 | dev_info(&intf->dev, "%s: USB WDM device\n", dev_name(intf->usb_dev)); |
afba937e ON |
860 | out: |
861 | return rv; | |
afba937e | 862 | err: |
6286d85e BM |
863 | spin_lock(&wdm_device_list_lock); |
864 | list_del(&desc->device_list); | |
865 | spin_unlock(&wdm_device_list_lock); | |
0dffb486 BM |
866 | cleanup(desc); |
867 | return rv; | |
868 | } | |
869 | ||
3cc36157 BM |
870 | static int wdm_manage_power(struct usb_interface *intf, int on) |
871 | { | |
872 | /* need autopm_get/put here to ensure the usbcore sees the new value */ | |
873 | int rv = usb_autopm_get_interface(intf); | |
3cc36157 BM |
874 | |
875 | intf->needs_remote_wakeup = on; | |
4144bc86 BM |
876 | if (!rv) |
877 | usb_autopm_put_interface(intf); | |
878 | return 0; | |
3cc36157 BM |
879 | } |
880 | ||
0dffb486 BM |
881 | static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) |
882 | { | |
883 | int rv = -EINVAL; | |
884 | struct usb_host_interface *iface; | |
885 | struct usb_endpoint_descriptor *ep; | |
7fae7bfb | 886 | struct usb_cdc_parsed_header hdr; |
0dffb486 BM |
887 | u8 *buffer = intf->altsetting->extra; |
888 | int buflen = intf->altsetting->extralen; | |
889 | u16 maxcom = WDM_DEFAULT_BUFSIZE; | |
890 | ||
891 | if (!buffer) | |
892 | goto err; | |
0dffb486 | 893 | |
7fae7bfb ON |
894 | cdc_parse_cdc_header(&hdr, intf, buffer, buflen); |
895 | ||
896 | if (hdr.usb_cdc_dmm_desc) | |
897 | maxcom = le16_to_cpu(hdr.usb_cdc_dmm_desc->wMaxCommand); | |
0dffb486 BM |
898 | |
899 | iface = intf->cur_altsetting; | |
900 | if (iface->desc.bNumEndpoints != 1) | |
901 | goto err; | |
902 | ep = &iface->endpoint[0].desc; | |
903 | ||
19445816 | 904 | rv = wdm_create(intf, ep, maxcom, &wdm_manage_power); |
0dffb486 BM |
905 | |
906 | err: | |
afba937e ON |
907 | return rv; |
908 | } | |
909 | ||
3cc36157 BM |
910 | /** |
911 | * usb_cdc_wdm_register - register a WDM subdriver | |
912 | * @intf: usb interface the subdriver will associate with | |
913 | * @ep: interrupt endpoint to monitor for notifications | |
914 | * @bufsize: maximum message size to support for read/write | |
915 | * | |
916 | * Create WDM usb class character device and associate it with intf | |
917 | * without binding, allowing another driver to manage the interface. | |
918 | * | |
919 | * The subdriver will manage the given interrupt endpoint exclusively | |
920 | * and will issue control requests referring to the given intf. It | |
921 | * will otherwise avoid interferring, and in particular not do | |
922 | * usb_set_intfdata/usb_get_intfdata on intf. | |
923 | * | |
924 | * The return value is a pointer to the subdriver's struct usb_driver. | |
925 | * The registering driver is responsible for calling this subdriver's | |
926 | * disconnect, suspend, resume, pre_reset and post_reset methods from | |
927 | * its own. | |
928 | */ | |
929 | struct usb_driver *usb_cdc_wdm_register(struct usb_interface *intf, | |
930 | struct usb_endpoint_descriptor *ep, | |
931 | int bufsize, | |
932 | int (*manage_power)(struct usb_interface *, int)) | |
933 | { | |
934 | int rv = -EINVAL; | |
935 | ||
19445816 | 936 | rv = wdm_create(intf, ep, bufsize, manage_power); |
3cc36157 BM |
937 | if (rv < 0) |
938 | goto err; | |
939 | ||
940 | return &wdm_driver; | |
941 | err: | |
942 | return ERR_PTR(rv); | |
943 | } | |
944 | EXPORT_SYMBOL(usb_cdc_wdm_register); | |
945 | ||
afba937e ON |
946 | static void wdm_disconnect(struct usb_interface *intf) |
947 | { | |
948 | struct wdm_device *desc; | |
949 | unsigned long flags; | |
950 | ||
951 | usb_deregister_dev(intf, &wdm_class); | |
b0c13860 | 952 | desc = wdm_find_device(intf); |
afba937e | 953 | mutex_lock(&wdm_mutex); |
afba937e ON |
954 | |
955 | /* the spinlock makes sure no new urbs are generated in the callbacks */ | |
956 | spin_lock_irqsave(&desc->iuspin, flags); | |
957 | set_bit(WDM_DISCONNECTING, &desc->flags); | |
958 | set_bit(WDM_READ, &desc->flags); | |
17d80d56 | 959 | /* to terminate pending flushes */ |
afba937e ON |
960 | clear_bit(WDM_IN_USE, &desc->flags); |
961 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
62aaf24d | 962 | wake_up_all(&desc->wait); |
e8537bd2 BM |
963 | mutex_lock(&desc->rlock); |
964 | mutex_lock(&desc->wlock); | |
afba937e | 965 | kill_urbs(desc); |
d93d16e9 | 966 | cancel_work_sync(&desc->rxwork); |
e8537bd2 BM |
967 | mutex_unlock(&desc->wlock); |
968 | mutex_unlock(&desc->rlock); | |
6286d85e BM |
969 | |
970 | /* the desc->intf pointer used as list key is now invalid */ | |
971 | spin_lock(&wdm_device_list_lock); | |
972 | list_del(&desc->device_list); | |
973 | spin_unlock(&wdm_device_list_lock); | |
974 | ||
afba937e ON |
975 | if (!desc->count) |
976 | cleanup(desc); | |
880bca3a | 977 | else |
13a88bf5 | 978 | dev_dbg(&intf->dev, "%d open files - postponing cleanup\n", desc->count); |
afba937e ON |
979 | mutex_unlock(&wdm_mutex); |
980 | } | |
981 | ||
d93d16e9 | 982 | #ifdef CONFIG_PM |
17d80d56 ON |
983 | static int wdm_suspend(struct usb_interface *intf, pm_message_t message) |
984 | { | |
b0c13860 | 985 | struct wdm_device *desc = wdm_find_device(intf); |
17d80d56 ON |
986 | int rv = 0; |
987 | ||
988 | dev_dbg(&desc->intf->dev, "wdm%d_suspend\n", intf->minor); | |
989 | ||
d93d16e9 | 990 | /* if this is an autosuspend the caller does the locking */ |
e8537bd2 BM |
991 | if (!PMSG_IS_AUTO(message)) { |
992 | mutex_lock(&desc->rlock); | |
993 | mutex_lock(&desc->wlock); | |
994 | } | |
62e66854 | 995 | spin_lock_irq(&desc->iuspin); |
d93d16e9 | 996 | |
5b1b0b81 | 997 | if (PMSG_IS_AUTO(message) && |
922a5ead ON |
998 | (test_bit(WDM_IN_USE, &desc->flags) |
999 | || test_bit(WDM_RESPONDING, &desc->flags))) { | |
62e66854 | 1000 | spin_unlock_irq(&desc->iuspin); |
17d80d56 ON |
1001 | rv = -EBUSY; |
1002 | } else { | |
d93d16e9 | 1003 | |
beb1d35f | 1004 | set_bit(WDM_SUSPENDING, &desc->flags); |
62e66854 | 1005 | spin_unlock_irq(&desc->iuspin); |
d93d16e9 | 1006 | /* callback submits work - order is essential */ |
17d80d56 | 1007 | kill_urbs(desc); |
d93d16e9 | 1008 | cancel_work_sync(&desc->rxwork); |
17d80d56 | 1009 | } |
e8537bd2 BM |
1010 | if (!PMSG_IS_AUTO(message)) { |
1011 | mutex_unlock(&desc->wlock); | |
1012 | mutex_unlock(&desc->rlock); | |
1013 | } | |
17d80d56 ON |
1014 | |
1015 | return rv; | |
1016 | } | |
d93d16e9 | 1017 | #endif |
17d80d56 ON |
1018 | |
1019 | static int recover_from_urb_loss(struct wdm_device *desc) | |
1020 | { | |
1021 | int rv = 0; | |
1022 | ||
1023 | if (desc->count) { | |
1024 | rv = usb_submit_urb(desc->validity, GFP_NOIO); | |
1025 | if (rv < 0) | |
9908a32e GKH |
1026 | dev_err(&desc->intf->dev, |
1027 | "Error resume submitting int urb - %d\n", rv); | |
17d80d56 ON |
1028 | } |
1029 | return rv; | |
1030 | } | |
d93d16e9 ON |
1031 | |
1032 | #ifdef CONFIG_PM | |
17d80d56 ON |
1033 | static int wdm_resume(struct usb_interface *intf) |
1034 | { | |
b0c13860 | 1035 | struct wdm_device *desc = wdm_find_device(intf); |
17d80d56 ON |
1036 | int rv; |
1037 | ||
1038 | dev_dbg(&desc->intf->dev, "wdm%d_resume\n", intf->minor); | |
338124c1 | 1039 | |
beb1d35f | 1040 | clear_bit(WDM_SUSPENDING, &desc->flags); |
62e66854 | 1041 | rv = recover_from_urb_loss(desc); |
338124c1 | 1042 | |
17d80d56 ON |
1043 | return rv; |
1044 | } | |
d93d16e9 | 1045 | #endif |
17d80d56 ON |
1046 | |
1047 | static int wdm_pre_reset(struct usb_interface *intf) | |
1048 | { | |
b0c13860 | 1049 | struct wdm_device *desc = wdm_find_device(intf); |
17d80d56 | 1050 | |
d771d8aa ON |
1051 | /* |
1052 | * we notify everybody using poll of | |
1053 | * an exceptional situation | |
1054 | * must be done before recovery lest a spontaneous | |
1055 | * message from the device is lost | |
1056 | */ | |
1057 | spin_lock_irq(&desc->iuspin); | |
88044202 BM |
1058 | set_bit(WDM_RESETTING, &desc->flags); /* inform read/write */ |
1059 | set_bit(WDM_READ, &desc->flags); /* unblock read */ | |
1060 | clear_bit(WDM_IN_USE, &desc->flags); /* unblock write */ | |
d771d8aa ON |
1061 | desc->rerr = -EINTR; |
1062 | spin_unlock_irq(&desc->iuspin); | |
1063 | wake_up_all(&desc->wait); | |
88044202 BM |
1064 | mutex_lock(&desc->rlock); |
1065 | mutex_lock(&desc->wlock); | |
1066 | kill_urbs(desc); | |
1067 | cancel_work_sync(&desc->rxwork); | |
17d80d56 ON |
1068 | return 0; |
1069 | } | |
1070 | ||
1071 | static int wdm_post_reset(struct usb_interface *intf) | |
1072 | { | |
b0c13860 | 1073 | struct wdm_device *desc = wdm_find_device(intf); |
17d80d56 ON |
1074 | int rv; |
1075 | ||
c0f5ecee | 1076 | clear_bit(WDM_OVERFLOW, &desc->flags); |
88044202 | 1077 | clear_bit(WDM_RESETTING, &desc->flags); |
17d80d56 | 1078 | rv = recover_from_urb_loss(desc); |
e8537bd2 BM |
1079 | mutex_unlock(&desc->wlock); |
1080 | mutex_unlock(&desc->rlock); | |
17d80d56 ON |
1081 | return 0; |
1082 | } | |
1083 | ||
afba937e ON |
1084 | static struct usb_driver wdm_driver = { |
1085 | .name = "cdc_wdm", | |
1086 | .probe = wdm_probe, | |
1087 | .disconnect = wdm_disconnect, | |
d93d16e9 | 1088 | #ifdef CONFIG_PM |
17d80d56 ON |
1089 | .suspend = wdm_suspend, |
1090 | .resume = wdm_resume, | |
1091 | .reset_resume = wdm_resume, | |
d93d16e9 | 1092 | #endif |
17d80d56 ON |
1093 | .pre_reset = wdm_pre_reset, |
1094 | .post_reset = wdm_post_reset, | |
afba937e | 1095 | .id_table = wdm_ids, |
17d80d56 | 1096 | .supports_autosuspend = 1, |
e1f12eb6 | 1097 | .disable_hub_initiated_lpm = 1, |
afba937e ON |
1098 | }; |
1099 | ||
65db4305 | 1100 | module_usb_driver(wdm_driver); |
afba937e ON |
1101 | |
1102 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
87d65e54 | 1103 | MODULE_DESCRIPTION(DRIVER_DESC); |
afba937e | 1104 | MODULE_LICENSE("GPL"); |