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Commit | Line | Data |
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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 | ||
1a3d2018 ON |
588 | wait_event(desc->wait, |
589 | /* | |
590 | * needs both flags. We cannot do with one | |
591 | * because resetting it would cause a race | |
592 | * with write() yet we need to signal | |
593 | * a disconnect | |
594 | */ | |
595 | !test_bit(WDM_IN_USE, &desc->flags) || | |
596 | test_bit(WDM_DISCONNECTING, &desc->flags)); | |
6b0b79d3 BM |
597 | |
598 | /* cannot dereference desc->intf if WDM_DISCONNECTING */ | |
1a3d2018 ON |
599 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) |
600 | return -ENODEV; | |
601 | if (desc->werr < 0) | |
9908a32e GKH |
602 | dev_err(&desc->intf->dev, "Error in flush path: %d\n", |
603 | desc->werr); | |
afba937e | 604 | |
24a85bae | 605 | return usb_translate_errors(desc->werr); |
afba937e ON |
606 | } |
607 | ||
608 | static unsigned int wdm_poll(struct file *file, struct poll_table_struct *wait) | |
609 | { | |
610 | struct wdm_device *desc = file->private_data; | |
611 | unsigned long flags; | |
612 | unsigned int mask = 0; | |
613 | ||
614 | spin_lock_irqsave(&desc->iuspin, flags); | |
615 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
616b6937 | 616 | mask = POLLHUP | POLLERR; |
afba937e ON |
617 | spin_unlock_irqrestore(&desc->iuspin, flags); |
618 | goto desc_out; | |
619 | } | |
620 | if (test_bit(WDM_READ, &desc->flags)) | |
621 | mask = POLLIN | POLLRDNORM; | |
622 | if (desc->rerr || desc->werr) | |
623 | mask |= POLLERR; | |
624 | if (!test_bit(WDM_IN_USE, &desc->flags)) | |
625 | mask |= POLLOUT | POLLWRNORM; | |
626 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
627 | ||
628 | poll_wait(file, &desc->wait, wait); | |
629 | ||
630 | desc_out: | |
631 | return mask; | |
632 | } | |
633 | ||
634 | static int wdm_open(struct inode *inode, struct file *file) | |
635 | { | |
636 | int minor = iminor(inode); | |
637 | int rv = -ENODEV; | |
638 | struct usb_interface *intf; | |
639 | struct wdm_device *desc; | |
640 | ||
641 | mutex_lock(&wdm_mutex); | |
b0c13860 BM |
642 | desc = wdm_find_device_by_minor(minor); |
643 | if (!desc) | |
afba937e ON |
644 | goto out; |
645 | ||
b0c13860 | 646 | intf = desc->intf; |
afba937e ON |
647 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) |
648 | goto out; | |
afba937e ON |
649 | file->private_data = desc; |
650 | ||
17d80d56 | 651 | rv = usb_autopm_get_interface(desc->intf); |
afba937e | 652 | if (rv < 0) { |
9908a32e | 653 | dev_err(&desc->intf->dev, "Error autopm - %d\n", rv); |
afba937e ON |
654 | goto out; |
655 | } | |
afba937e | 656 | |
e8537bd2 BM |
657 | /* using write lock to protect desc->count */ |
658 | mutex_lock(&desc->wlock); | |
17d80d56 | 659 | if (!desc->count++) { |
d771d8aa ON |
660 | desc->werr = 0; |
661 | desc->rerr = 0; | |
17d80d56 ON |
662 | rv = usb_submit_urb(desc->validity, GFP_KERNEL); |
663 | if (rv < 0) { | |
664 | desc->count--; | |
9908a32e GKH |
665 | dev_err(&desc->intf->dev, |
666 | "Error submitting int urb - %d\n", rv); | |
12a98b2b | 667 | rv = usb_translate_errors(rv); |
17d80d56 ON |
668 | } |
669 | } else { | |
670 | rv = 0; | |
671 | } | |
e8537bd2 | 672 | mutex_unlock(&desc->wlock); |
3cc36157 BM |
673 | if (desc->count == 1) |
674 | desc->manage_power(intf, 1); | |
17d80d56 | 675 | usb_autopm_put_interface(desc->intf); |
afba937e ON |
676 | out: |
677 | mutex_unlock(&wdm_mutex); | |
678 | return rv; | |
679 | } | |
680 | ||
681 | static int wdm_release(struct inode *inode, struct file *file) | |
682 | { | |
683 | struct wdm_device *desc = file->private_data; | |
684 | ||
685 | mutex_lock(&wdm_mutex); | |
e8537bd2 BM |
686 | |
687 | /* using write lock to protect desc->count */ | |
688 | mutex_lock(&desc->wlock); | |
afba937e | 689 | desc->count--; |
e8537bd2 | 690 | mutex_unlock(&desc->wlock); |
17d80d56 | 691 | |
afba937e | 692 | if (!desc->count) { |
880bca3a | 693 | if (!test_bit(WDM_DISCONNECTING, &desc->flags)) { |
ce8bb344 | 694 | dev_dbg(&desc->intf->dev, "wdm_release: cleanup\n"); |
6b0b79d3 | 695 | kill_urbs(desc); |
73e06865 GS |
696 | spin_lock_irq(&desc->iuspin); |
697 | desc->resp_count = 0; | |
698 | spin_unlock_irq(&desc->iuspin); | |
3cc36157 | 699 | desc->manage_power(desc->intf, 0); |
880bca3a | 700 | } else { |
6b0b79d3 BM |
701 | /* must avoid dev_printk here as desc->intf is invalid */ |
702 | pr_debug(KBUILD_MODNAME " %s: device gone - cleaning up\n", __func__); | |
2f338c8a | 703 | cleanup(desc); |
880bca3a | 704 | } |
afba937e ON |
705 | } |
706 | mutex_unlock(&wdm_mutex); | |
707 | return 0; | |
708 | } | |
709 | ||
3edce1cf BM |
710 | static long wdm_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
711 | { | |
712 | struct wdm_device *desc = file->private_data; | |
713 | int rv = 0; | |
714 | ||
715 | switch (cmd) { | |
716 | case IOCTL_WDM_MAX_COMMAND: | |
717 | if (copy_to_user((void __user *)arg, &desc->wMaxCommand, sizeof(desc->wMaxCommand))) | |
718 | rv = -EFAULT; | |
719 | break; | |
720 | default: | |
721 | rv = -ENOTTY; | |
722 | } | |
723 | return rv; | |
724 | } | |
725 | ||
afba937e ON |
726 | static const struct file_operations wdm_fops = { |
727 | .owner = THIS_MODULE, | |
728 | .read = wdm_read, | |
729 | .write = wdm_write, | |
730 | .open = wdm_open, | |
731 | .flush = wdm_flush, | |
732 | .release = wdm_release, | |
6038f373 | 733 | .poll = wdm_poll, |
3edce1cf BM |
734 | .unlocked_ioctl = wdm_ioctl, |
735 | .compat_ioctl = wdm_ioctl, | |
6038f373 | 736 | .llseek = noop_llseek, |
afba937e ON |
737 | }; |
738 | ||
739 | static struct usb_class_driver wdm_class = { | |
740 | .name = "cdc-wdm%d", | |
741 | .fops = &wdm_fops, | |
742 | .minor_base = WDM_MINOR_BASE, | |
743 | }; | |
744 | ||
745 | /* --- error handling --- */ | |
746 | static void wdm_rxwork(struct work_struct *work) | |
747 | { | |
748 | struct wdm_device *desc = container_of(work, struct wdm_device, rxwork); | |
749 | unsigned long flags; | |
6dd433e6 ON |
750 | int rv = 0; |
751 | int responding; | |
afba937e ON |
752 | |
753 | spin_lock_irqsave(&desc->iuspin, flags); | |
754 | if (test_bit(WDM_DISCONNECTING, &desc->flags)) { | |
755 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
756 | } else { | |
6dd433e6 | 757 | responding = test_and_set_bit(WDM_RESPONDING, &desc->flags); |
afba937e | 758 | spin_unlock_irqrestore(&desc->iuspin, flags); |
6dd433e6 ON |
759 | if (!responding) |
760 | rv = usb_submit_urb(desc->response, GFP_KERNEL); | |
afba937e ON |
761 | if (rv < 0 && rv != -EPERM) { |
762 | spin_lock_irqsave(&desc->iuspin, flags); | |
6dd433e6 | 763 | clear_bit(WDM_RESPONDING, &desc->flags); |
afba937e ON |
764 | if (!test_bit(WDM_DISCONNECTING, &desc->flags)) |
765 | schedule_work(&desc->rxwork); | |
766 | spin_unlock_irqrestore(&desc->iuspin, flags); | |
767 | } | |
768 | } | |
769 | } | |
770 | ||
771 | /* --- hotplug --- */ | |
772 | ||
3cc36157 | 773 | static int wdm_create(struct usb_interface *intf, struct usb_endpoint_descriptor *ep, |
19445816 | 774 | u16 bufsize, int (*manage_power)(struct usb_interface *, int)) |
afba937e | 775 | { |
0dffb486 | 776 | int rv = -ENOMEM; |
afba937e | 777 | struct wdm_device *desc; |
afba937e | 778 | |
afba937e ON |
779 | desc = kzalloc(sizeof(struct wdm_device), GFP_KERNEL); |
780 | if (!desc) | |
781 | goto out; | |
b0c13860 | 782 | INIT_LIST_HEAD(&desc->device_list); |
e8537bd2 BM |
783 | mutex_init(&desc->rlock); |
784 | mutex_init(&desc->wlock); | |
afba937e ON |
785 | spin_lock_init(&desc->iuspin); |
786 | init_waitqueue_head(&desc->wait); | |
0dffb486 | 787 | desc->wMaxCommand = bufsize; |
052fbc0d | 788 | /* this will be expanded and needed in hardware endianness */ |
afba937e ON |
789 | desc->inum = cpu_to_le16((u16)intf->cur_altsetting->desc.bInterfaceNumber); |
790 | desc->intf = intf; | |
791 | INIT_WORK(&desc->rxwork, wdm_rxwork); | |
792 | ||
052fbc0d | 793 | rv = -EINVAL; |
0dffb486 | 794 | if (!usb_endpoint_is_int_in(ep)) |
afba937e | 795 | goto err; |
afba937e | 796 | |
29cc8897 | 797 | desc->wMaxPacketSize = usb_endpoint_maxp(ep); |
afba937e ON |
798 | |
799 | desc->orq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); | |
800 | if (!desc->orq) | |
801 | goto err; | |
802 | desc->irq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); | |
803 | if (!desc->irq) | |
804 | goto err; | |
805 | ||
806 | desc->validity = usb_alloc_urb(0, GFP_KERNEL); | |
807 | if (!desc->validity) | |
808 | goto err; | |
809 | ||
810 | desc->response = usb_alloc_urb(0, GFP_KERNEL); | |
811 | if (!desc->response) | |
812 | goto err; | |
813 | ||
814 | desc->command = usb_alloc_urb(0, GFP_KERNEL); | |
815 | if (!desc->command) | |
816 | goto err; | |
817 | ||
818 | desc->ubuf = kmalloc(desc->wMaxCommand, GFP_KERNEL); | |
819 | if (!desc->ubuf) | |
820 | goto err; | |
821 | ||
8457d99c | 822 | desc->sbuf = kmalloc(desc->wMaxPacketSize, GFP_KERNEL); |
afba937e ON |
823 | if (!desc->sbuf) |
824 | goto err; | |
825 | ||
8457d99c | 826 | desc->inbuf = kmalloc(desc->wMaxCommand, GFP_KERNEL); |
afba937e | 827 | if (!desc->inbuf) |
8457d99c | 828 | goto err; |
afba937e ON |
829 | |
830 | usb_fill_int_urb( | |
831 | desc->validity, | |
832 | interface_to_usbdev(intf), | |
833 | usb_rcvintpipe(interface_to_usbdev(intf), ep->bEndpointAddress), | |
834 | desc->sbuf, | |
835 | desc->wMaxPacketSize, | |
836 | wdm_int_callback, | |
837 | desc, | |
838 | ep->bInterval | |
839 | ); | |
afba937e | 840 | |
19b85b3b BM |
841 | desc->irq->bRequestType = (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE); |
842 | desc->irq->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE; | |
843 | desc->irq->wValue = 0; | |
323ece54 | 844 | desc->irq->wIndex = desc->inum; /* already converted */ |
19b85b3b BM |
845 | desc->irq->wLength = cpu_to_le16(desc->wMaxCommand); |
846 | ||
847 | usb_fill_control_urb( | |
848 | desc->response, | |
8143a896 | 849 | interface_to_usbdev(intf), |
19b85b3b BM |
850 | /* using common endpoint 0 */ |
851 | usb_rcvctrlpipe(interface_to_usbdev(desc->intf), 0), | |
852 | (unsigned char *)desc->irq, | |
853 | desc->inbuf, | |
854 | desc->wMaxCommand, | |
855 | wdm_in_callback, | |
856 | desc | |
857 | ); | |
19b85b3b | 858 | |
3cc36157 BM |
859 | desc->manage_power = manage_power; |
860 | ||
b0c13860 BM |
861 | spin_lock(&wdm_device_list_lock); |
862 | list_add(&desc->device_list, &wdm_device_list); | |
863 | spin_unlock(&wdm_device_list_lock); | |
864 | ||
afba937e | 865 | rv = usb_register_dev(intf, &wdm_class); |
afba937e | 866 | if (rv < 0) |
b0c13860 | 867 | goto err; |
052fbc0d | 868 | else |
820c629a | 869 | dev_info(&intf->dev, "%s: USB WDM device\n", dev_name(intf->usb_dev)); |
afba937e ON |
870 | out: |
871 | return rv; | |
afba937e | 872 | err: |
6286d85e BM |
873 | spin_lock(&wdm_device_list_lock); |
874 | list_del(&desc->device_list); | |
875 | spin_unlock(&wdm_device_list_lock); | |
0dffb486 BM |
876 | cleanup(desc); |
877 | return rv; | |
878 | } | |
879 | ||
3cc36157 BM |
880 | static int wdm_manage_power(struct usb_interface *intf, int on) |
881 | { | |
882 | /* need autopm_get/put here to ensure the usbcore sees the new value */ | |
883 | int rv = usb_autopm_get_interface(intf); | |
3cc36157 BM |
884 | |
885 | intf->needs_remote_wakeup = on; | |
4144bc86 BM |
886 | if (!rv) |
887 | usb_autopm_put_interface(intf); | |
888 | return 0; | |
3cc36157 BM |
889 | } |
890 | ||
0dffb486 BM |
891 | static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) |
892 | { | |
893 | int rv = -EINVAL; | |
894 | struct usb_host_interface *iface; | |
895 | struct usb_endpoint_descriptor *ep; | |
7fae7bfb | 896 | struct usb_cdc_parsed_header hdr; |
0dffb486 BM |
897 | u8 *buffer = intf->altsetting->extra; |
898 | int buflen = intf->altsetting->extralen; | |
899 | u16 maxcom = WDM_DEFAULT_BUFSIZE; | |
900 | ||
901 | if (!buffer) | |
902 | goto err; | |
0dffb486 | 903 | |
7fae7bfb ON |
904 | cdc_parse_cdc_header(&hdr, intf, buffer, buflen); |
905 | ||
906 | if (hdr.usb_cdc_dmm_desc) | |
907 | maxcom = le16_to_cpu(hdr.usb_cdc_dmm_desc->wMaxCommand); | |
0dffb486 BM |
908 | |
909 | iface = intf->cur_altsetting; | |
910 | if (iface->desc.bNumEndpoints != 1) | |
911 | goto err; | |
912 | ep = &iface->endpoint[0].desc; | |
913 | ||
19445816 | 914 | rv = wdm_create(intf, ep, maxcom, &wdm_manage_power); |
0dffb486 BM |
915 | |
916 | err: | |
afba937e ON |
917 | return rv; |
918 | } | |
919 | ||
3cc36157 BM |
920 | /** |
921 | * usb_cdc_wdm_register - register a WDM subdriver | |
922 | * @intf: usb interface the subdriver will associate with | |
923 | * @ep: interrupt endpoint to monitor for notifications | |
924 | * @bufsize: maximum message size to support for read/write | |
925 | * | |
926 | * Create WDM usb class character device and associate it with intf | |
927 | * without binding, allowing another driver to manage the interface. | |
928 | * | |
929 | * The subdriver will manage the given interrupt endpoint exclusively | |
930 | * and will issue control requests referring to the given intf. It | |
931 | * will otherwise avoid interferring, and in particular not do | |
932 | * usb_set_intfdata/usb_get_intfdata on intf. | |
933 | * | |
934 | * The return value is a pointer to the subdriver's struct usb_driver. | |
935 | * The registering driver is responsible for calling this subdriver's | |
936 | * disconnect, suspend, resume, pre_reset and post_reset methods from | |
937 | * its own. | |
938 | */ | |
939 | struct usb_driver *usb_cdc_wdm_register(struct usb_interface *intf, | |
940 | struct usb_endpoint_descriptor *ep, | |
941 | int bufsize, | |
942 | int (*manage_power)(struct usb_interface *, int)) | |
943 | { | |
944 | int rv = -EINVAL; | |
945 | ||
19445816 | 946 | rv = wdm_create(intf, ep, bufsize, manage_power); |
3cc36157 BM |
947 | if (rv < 0) |
948 | goto err; | |
949 | ||
950 | return &wdm_driver; | |
951 | err: | |
952 | return ERR_PTR(rv); | |
953 | } | |
954 | EXPORT_SYMBOL(usb_cdc_wdm_register); | |
955 | ||
afba937e ON |
956 | static void wdm_disconnect(struct usb_interface *intf) |
957 | { | |
958 | struct wdm_device *desc; | |
959 | unsigned long flags; | |
960 | ||
961 | usb_deregister_dev(intf, &wdm_class); | |
b0c13860 | 962 | desc = wdm_find_device(intf); |
afba937e | 963 | mutex_lock(&wdm_mutex); |
afba937e ON |
964 | |
965 | /* the spinlock makes sure no new urbs are generated in the callbacks */ | |
966 | spin_lock_irqsave(&desc->iuspin, flags); | |
967 | set_bit(WDM_DISCONNECTING, &desc->flags); | |
968 | set_bit(WDM_READ, &desc->flags); | |
afba937e | 969 | spin_unlock_irqrestore(&desc->iuspin, flags); |
62aaf24d | 970 | wake_up_all(&desc->wait); |
e8537bd2 BM |
971 | mutex_lock(&desc->rlock); |
972 | mutex_lock(&desc->wlock); | |
afba937e | 973 | kill_urbs(desc); |
d93d16e9 | 974 | cancel_work_sync(&desc->rxwork); |
e8537bd2 BM |
975 | mutex_unlock(&desc->wlock); |
976 | mutex_unlock(&desc->rlock); | |
6286d85e BM |
977 | |
978 | /* the desc->intf pointer used as list key is now invalid */ | |
979 | spin_lock(&wdm_device_list_lock); | |
980 | list_del(&desc->device_list); | |
981 | spin_unlock(&wdm_device_list_lock); | |
982 | ||
afba937e ON |
983 | if (!desc->count) |
984 | cleanup(desc); | |
880bca3a | 985 | else |
13a88bf5 | 986 | dev_dbg(&intf->dev, "%d open files - postponing cleanup\n", desc->count); |
afba937e ON |
987 | mutex_unlock(&wdm_mutex); |
988 | } | |
989 | ||
d93d16e9 | 990 | #ifdef CONFIG_PM |
17d80d56 ON |
991 | static int wdm_suspend(struct usb_interface *intf, pm_message_t message) |
992 | { | |
b0c13860 | 993 | struct wdm_device *desc = wdm_find_device(intf); |
17d80d56 ON |
994 | int rv = 0; |
995 | ||
996 | dev_dbg(&desc->intf->dev, "wdm%d_suspend\n", intf->minor); | |
997 | ||
d93d16e9 | 998 | /* if this is an autosuspend the caller does the locking */ |
e8537bd2 BM |
999 | if (!PMSG_IS_AUTO(message)) { |
1000 | mutex_lock(&desc->rlock); | |
1001 | mutex_lock(&desc->wlock); | |
1002 | } | |
62e66854 | 1003 | spin_lock_irq(&desc->iuspin); |
d93d16e9 | 1004 | |
5b1b0b81 | 1005 | if (PMSG_IS_AUTO(message) && |
922a5ead ON |
1006 | (test_bit(WDM_IN_USE, &desc->flags) |
1007 | || test_bit(WDM_RESPONDING, &desc->flags))) { | |
62e66854 | 1008 | spin_unlock_irq(&desc->iuspin); |
17d80d56 ON |
1009 | rv = -EBUSY; |
1010 | } else { | |
d93d16e9 | 1011 | |
beb1d35f | 1012 | set_bit(WDM_SUSPENDING, &desc->flags); |
62e66854 | 1013 | spin_unlock_irq(&desc->iuspin); |
d93d16e9 | 1014 | /* callback submits work - order is essential */ |
17d80d56 | 1015 | kill_urbs(desc); |
d93d16e9 | 1016 | cancel_work_sync(&desc->rxwork); |
17d80d56 | 1017 | } |
e8537bd2 BM |
1018 | if (!PMSG_IS_AUTO(message)) { |
1019 | mutex_unlock(&desc->wlock); | |
1020 | mutex_unlock(&desc->rlock); | |
1021 | } | |
17d80d56 ON |
1022 | |
1023 | return rv; | |
1024 | } | |
d93d16e9 | 1025 | #endif |
17d80d56 ON |
1026 | |
1027 | static int recover_from_urb_loss(struct wdm_device *desc) | |
1028 | { | |
1029 | int rv = 0; | |
1030 | ||
1031 | if (desc->count) { | |
1032 | rv = usb_submit_urb(desc->validity, GFP_NOIO); | |
1033 | if (rv < 0) | |
9908a32e GKH |
1034 | dev_err(&desc->intf->dev, |
1035 | "Error resume submitting int urb - %d\n", rv); | |
17d80d56 ON |
1036 | } |
1037 | return rv; | |
1038 | } | |
d93d16e9 ON |
1039 | |
1040 | #ifdef CONFIG_PM | |
17d80d56 ON |
1041 | static int wdm_resume(struct usb_interface *intf) |
1042 | { | |
b0c13860 | 1043 | struct wdm_device *desc = wdm_find_device(intf); |
17d80d56 ON |
1044 | int rv; |
1045 | ||
1046 | dev_dbg(&desc->intf->dev, "wdm%d_resume\n", intf->minor); | |
338124c1 | 1047 | |
beb1d35f | 1048 | clear_bit(WDM_SUSPENDING, &desc->flags); |
62e66854 | 1049 | rv = recover_from_urb_loss(desc); |
338124c1 | 1050 | |
17d80d56 ON |
1051 | return rv; |
1052 | } | |
d93d16e9 | 1053 | #endif |
17d80d56 ON |
1054 | |
1055 | static int wdm_pre_reset(struct usb_interface *intf) | |
1056 | { | |
b0c13860 | 1057 | struct wdm_device *desc = wdm_find_device(intf); |
17d80d56 | 1058 | |
d771d8aa ON |
1059 | /* |
1060 | * we notify everybody using poll of | |
1061 | * an exceptional situation | |
1062 | * must be done before recovery lest a spontaneous | |
1063 | * message from the device is lost | |
1064 | */ | |
1065 | spin_lock_irq(&desc->iuspin); | |
88044202 BM |
1066 | set_bit(WDM_RESETTING, &desc->flags); /* inform read/write */ |
1067 | set_bit(WDM_READ, &desc->flags); /* unblock read */ | |
1068 | clear_bit(WDM_IN_USE, &desc->flags); /* unblock write */ | |
d771d8aa ON |
1069 | desc->rerr = -EINTR; |
1070 | spin_unlock_irq(&desc->iuspin); | |
1071 | wake_up_all(&desc->wait); | |
88044202 BM |
1072 | mutex_lock(&desc->rlock); |
1073 | mutex_lock(&desc->wlock); | |
1074 | kill_urbs(desc); | |
1075 | cancel_work_sync(&desc->rxwork); | |
17d80d56 ON |
1076 | return 0; |
1077 | } | |
1078 | ||
1079 | static int wdm_post_reset(struct usb_interface *intf) | |
1080 | { | |
b0c13860 | 1081 | struct wdm_device *desc = wdm_find_device(intf); |
17d80d56 ON |
1082 | int rv; |
1083 | ||
c0f5ecee | 1084 | clear_bit(WDM_OVERFLOW, &desc->flags); |
88044202 | 1085 | clear_bit(WDM_RESETTING, &desc->flags); |
17d80d56 | 1086 | rv = recover_from_urb_loss(desc); |
e8537bd2 BM |
1087 | mutex_unlock(&desc->wlock); |
1088 | mutex_unlock(&desc->rlock); | |
db64c45a | 1089 | return rv; |
17d80d56 ON |
1090 | } |
1091 | ||
afba937e ON |
1092 | static struct usb_driver wdm_driver = { |
1093 | .name = "cdc_wdm", | |
1094 | .probe = wdm_probe, | |
1095 | .disconnect = wdm_disconnect, | |
d93d16e9 | 1096 | #ifdef CONFIG_PM |
17d80d56 ON |
1097 | .suspend = wdm_suspend, |
1098 | .resume = wdm_resume, | |
1099 | .reset_resume = wdm_resume, | |
d93d16e9 | 1100 | #endif |
17d80d56 ON |
1101 | .pre_reset = wdm_pre_reset, |
1102 | .post_reset = wdm_post_reset, | |
afba937e | 1103 | .id_table = wdm_ids, |
17d80d56 | 1104 | .supports_autosuspend = 1, |
e1f12eb6 | 1105 | .disable_hub_initiated_lpm = 1, |
afba937e ON |
1106 | }; |
1107 | ||
65db4305 | 1108 | module_usb_driver(wdm_driver); |
afba937e ON |
1109 | |
1110 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
87d65e54 | 1111 | MODULE_DESCRIPTION(DRIVER_DESC); |
afba937e | 1112 | MODULE_LICENSE("GPL"); |