1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 USB Driver layer for GSM modems
4
5 Copyright (C) 2005 Matthias Urlichs <smurf@smurf.noris.de>
6
7 Portions copied from the Keyspan driver by Hugh Blemings <hugh@blemings.org>
8
9 History: see the git log.
10
11 Work sponsored by: Sigos GmbH, Germany <info@sigos.de>
12
13 This driver exists because the "normal" serial driver doesn't work too well
14 with GSM modems. Issues:
15 - data loss -- one single Receive URB is not nearly enough
16 - controlling the baud rate doesn't make sense
17 */
18
19 #define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>"
20 #define DRIVER_DESC "USB Driver for GSM modems"
21
22 #include <linux/kernel.h>
23 #include <linux/jiffies.h>
24 #include <linux/errno.h>
25 #include <linux/slab.h>
26 #include <linux/tty.h>
27 #include <linux/tty_flip.h>
28 #include <linux/module.h>
29 #include <linux/bitops.h>
30 #include <linux/uaccess.h>
31 #include <linux/usb.h>
32 #include <linux/usb/serial.h>
33 #include <linux/serial.h>
34 #include "usb-wwan.h"
35
36 /*
37 * Generate DTR/RTS signals on the port using the SET_CONTROL_LINE_STATE request
38 * in CDC ACM.
39 */
usb_wwan_send_setup(struct usb_serial_port * port)40 static int usb_wwan_send_setup(struct usb_serial_port *port)
41 {
42 struct usb_serial *serial = port->serial;
43 struct usb_wwan_port_private *portdata;
44 int val = 0;
45 int ifnum;
46 int res;
47
48 portdata = usb_get_serial_port_data(port);
49
50 if (portdata->dtr_state)
51 val |= 0x01;
52 if (portdata->rts_state)
53 val |= 0x02;
54
55 ifnum = serial->interface->cur_altsetting->desc.bInterfaceNumber;
56
57 res = usb_autopm_get_interface(serial->interface);
58 if (res)
59 return res;
60
61 res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
62 0x22, 0x21, val, ifnum, NULL, 0,
63 USB_CTRL_SET_TIMEOUT);
64
65 usb_autopm_put_interface(port->serial->interface);
66
67 return res;
68 }
69
usb_wwan_dtr_rts(struct usb_serial_port * port,int on)70 void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
71 {
72 struct usb_wwan_port_private *portdata;
73 struct usb_wwan_intf_private *intfdata;
74
75 intfdata = usb_get_serial_data(port->serial);
76
77 if (!intfdata->use_send_setup)
78 return;
79
80 portdata = usb_get_serial_port_data(port);
81 /* FIXME: locking */
82 portdata->rts_state = on;
83 portdata->dtr_state = on;
84
85 usb_wwan_send_setup(port);
86 }
87 EXPORT_SYMBOL(usb_wwan_dtr_rts);
88
usb_wwan_tiocmget(struct tty_struct * tty)89 int usb_wwan_tiocmget(struct tty_struct *tty)
90 {
91 struct usb_serial_port *port = tty->driver_data;
92 unsigned int value;
93 struct usb_wwan_port_private *portdata;
94
95 portdata = usb_get_serial_port_data(port);
96
97 value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
98 ((portdata->dtr_state) ? TIOCM_DTR : 0) |
99 ((portdata->cts_state) ? TIOCM_CTS : 0) |
100 ((portdata->dsr_state) ? TIOCM_DSR : 0) |
101 ((portdata->dcd_state) ? TIOCM_CAR : 0) |
102 ((portdata->ri_state) ? TIOCM_RNG : 0);
103
104 return value;
105 }
106 EXPORT_SYMBOL(usb_wwan_tiocmget);
107
usb_wwan_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)108 int usb_wwan_tiocmset(struct tty_struct *tty,
109 unsigned int set, unsigned int clear)
110 {
111 struct usb_serial_port *port = tty->driver_data;
112 struct usb_wwan_port_private *portdata;
113 struct usb_wwan_intf_private *intfdata;
114
115 portdata = usb_get_serial_port_data(port);
116 intfdata = usb_get_serial_data(port->serial);
117
118 if (!intfdata->use_send_setup)
119 return -EINVAL;
120
121 /* FIXME: what locks portdata fields ? */
122 if (set & TIOCM_RTS)
123 portdata->rts_state = 1;
124 if (set & TIOCM_DTR)
125 portdata->dtr_state = 1;
126
127 if (clear & TIOCM_RTS)
128 portdata->rts_state = 0;
129 if (clear & TIOCM_DTR)
130 portdata->dtr_state = 0;
131 return usb_wwan_send_setup(port);
132 }
133 EXPORT_SYMBOL(usb_wwan_tiocmset);
134
usb_wwan_get_serial_info(struct tty_struct * tty,struct serial_struct * ss)135 int usb_wwan_get_serial_info(struct tty_struct *tty,
136 struct serial_struct *ss)
137 {
138 struct usb_serial_port *port = tty->driver_data;
139
140 ss->line = port->minor;
141 ss->port = port->port_number;
142 ss->baud_base = tty_get_baud_rate(port->port.tty);
143 ss->close_delay = jiffies_to_msecs(port->port.close_delay) / 10;
144 ss->closing_wait = port->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
145 ASYNC_CLOSING_WAIT_NONE :
146 jiffies_to_msecs(port->port.closing_wait) / 10;
147 return 0;
148 }
149 EXPORT_SYMBOL(usb_wwan_get_serial_info);
150
usb_wwan_set_serial_info(struct tty_struct * tty,struct serial_struct * ss)151 int usb_wwan_set_serial_info(struct tty_struct *tty,
152 struct serial_struct *ss)
153 {
154 struct usb_serial_port *port = tty->driver_data;
155 unsigned int closing_wait, close_delay;
156 int retval = 0;
157
158 close_delay = msecs_to_jiffies(ss->close_delay * 10);
159 closing_wait = ss->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
160 ASYNC_CLOSING_WAIT_NONE :
161 msecs_to_jiffies(ss->closing_wait * 10);
162
163 mutex_lock(&port->port.mutex);
164
165 if (!capable(CAP_SYS_ADMIN)) {
166 if ((close_delay != port->port.close_delay) ||
167 (closing_wait != port->port.closing_wait))
168 retval = -EPERM;
169 else
170 retval = -EOPNOTSUPP;
171 } else {
172 port->port.close_delay = close_delay;
173 port->port.closing_wait = closing_wait;
174 }
175
176 mutex_unlock(&port->port.mutex);
177 return retval;
178 }
179 EXPORT_SYMBOL(usb_wwan_set_serial_info);
180
usb_wwan_write(struct tty_struct * tty,struct usb_serial_port * port,const unsigned char * buf,int count)181 int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
182 const unsigned char *buf, int count)
183 {
184 struct usb_wwan_port_private *portdata;
185 struct usb_wwan_intf_private *intfdata;
186 int i;
187 int left, todo;
188 struct urb *this_urb = NULL; /* spurious */
189 int err;
190 unsigned long flags;
191
192 portdata = usb_get_serial_port_data(port);
193 intfdata = usb_get_serial_data(port->serial);
194
195 dev_dbg(&port->dev, "%s: write (%d chars)\n", __func__, count);
196
197 i = 0;
198 left = count;
199 for (i = 0; left > 0 && i < N_OUT_URB; i++) {
200 todo = left;
201 if (todo > OUT_BUFLEN)
202 todo = OUT_BUFLEN;
203
204 this_urb = portdata->out_urbs[i];
205 if (test_and_set_bit(i, &portdata->out_busy)) {
206 if (time_before(jiffies,
207 portdata->tx_start_time[i] + 10 * HZ))
208 continue;
209 usb_unlink_urb(this_urb);
210 continue;
211 }
212 dev_dbg(&port->dev, "%s: endpoint %d buf %d\n", __func__,
213 usb_pipeendpoint(this_urb->pipe), i);
214
215 err = usb_autopm_get_interface_async(port->serial->interface);
216 if (err < 0) {
217 clear_bit(i, &portdata->out_busy);
218 break;
219 }
220
221 /* send the data */
222 memcpy(this_urb->transfer_buffer, buf, todo);
223 this_urb->transfer_buffer_length = todo;
224
225 spin_lock_irqsave(&intfdata->susp_lock, flags);
226 if (intfdata->suspended) {
227 usb_anchor_urb(this_urb, &portdata->delayed);
228 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
229 } else {
230 intfdata->in_flight++;
231 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
232 err = usb_submit_urb(this_urb, GFP_ATOMIC);
233 if (err) {
234 dev_err(&port->dev,
235 "%s: submit urb %d failed: %d\n",
236 __func__, i, err);
237 clear_bit(i, &portdata->out_busy);
238 spin_lock_irqsave(&intfdata->susp_lock, flags);
239 intfdata->in_flight--;
240 spin_unlock_irqrestore(&intfdata->susp_lock,
241 flags);
242 usb_autopm_put_interface_async(port->serial->interface);
243 break;
244 }
245 }
246
247 portdata->tx_start_time[i] = jiffies;
248 buf += todo;
249 left -= todo;
250 }
251
252 count -= left;
253 dev_dbg(&port->dev, "%s: wrote (did %d)\n", __func__, count);
254 return count;
255 }
256 EXPORT_SYMBOL(usb_wwan_write);
257
usb_wwan_indat_callback(struct urb * urb)258 static void usb_wwan_indat_callback(struct urb *urb)
259 {
260 int err;
261 int endpoint;
262 struct usb_serial_port *port;
263 struct device *dev;
264 unsigned char *data = urb->transfer_buffer;
265 int status = urb->status;
266
267 endpoint = usb_pipeendpoint(urb->pipe);
268 port = urb->context;
269 dev = &port->dev;
270
271 if (status) {
272 dev_dbg(dev, "%s: nonzero status: %d on endpoint %02x.\n",
273 __func__, status, endpoint);
274
275 /* don't resubmit on fatal errors */
276 if (status == -ESHUTDOWN || status == -ENOENT)
277 return;
278 } else {
279 if (urb->actual_length) {
280 tty_insert_flip_string(&port->port, data,
281 urb->actual_length);
282 tty_flip_buffer_push(&port->port);
283 } else
284 dev_dbg(dev, "%s: empty read urb received\n", __func__);
285 }
286 /* Resubmit urb so we continue receiving */
287 err = usb_submit_urb(urb, GFP_ATOMIC);
288 if (err) {
289 if (err != -EPERM && err != -ENODEV) {
290 dev_err(dev, "%s: resubmit read urb failed. (%d)\n",
291 __func__, err);
292 /* busy also in error unless we are killed */
293 usb_mark_last_busy(port->serial->dev);
294 }
295 } else {
296 usb_mark_last_busy(port->serial->dev);
297 }
298 }
299
usb_wwan_outdat_callback(struct urb * urb)300 static void usb_wwan_outdat_callback(struct urb *urb)
301 {
302 struct usb_serial_port *port;
303 struct usb_wwan_port_private *portdata;
304 struct usb_wwan_intf_private *intfdata;
305 unsigned long flags;
306 int i;
307
308 port = urb->context;
309 intfdata = usb_get_serial_data(port->serial);
310
311 usb_serial_port_softint(port);
312 usb_autopm_put_interface_async(port->serial->interface);
313 portdata = usb_get_serial_port_data(port);
314 spin_lock_irqsave(&intfdata->susp_lock, flags);
315 intfdata->in_flight--;
316 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
317
318 for (i = 0; i < N_OUT_URB; ++i) {
319 if (portdata->out_urbs[i] == urb) {
320 smp_mb__before_atomic();
321 clear_bit(i, &portdata->out_busy);
322 break;
323 }
324 }
325 }
326
usb_wwan_write_room(struct tty_struct * tty)327 int usb_wwan_write_room(struct tty_struct *tty)
328 {
329 struct usb_serial_port *port = tty->driver_data;
330 struct usb_wwan_port_private *portdata;
331 int i;
332 int data_len = 0;
333 struct urb *this_urb;
334
335 portdata = usb_get_serial_port_data(port);
336
337 for (i = 0; i < N_OUT_URB; i++) {
338 this_urb = portdata->out_urbs[i];
339 if (this_urb && !test_bit(i, &portdata->out_busy))
340 data_len += OUT_BUFLEN;
341 }
342
343 dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
344 return data_len;
345 }
346 EXPORT_SYMBOL(usb_wwan_write_room);
347
usb_wwan_chars_in_buffer(struct tty_struct * tty)348 int usb_wwan_chars_in_buffer(struct tty_struct *tty)
349 {
350 struct usb_serial_port *port = tty->driver_data;
351 struct usb_wwan_port_private *portdata;
352 int i;
353 int data_len = 0;
354 struct urb *this_urb;
355
356 portdata = usb_get_serial_port_data(port);
357
358 for (i = 0; i < N_OUT_URB; i++) {
359 this_urb = portdata->out_urbs[i];
360 /* FIXME: This locking is insufficient as this_urb may
361 go unused during the test */
362 if (this_urb && test_bit(i, &portdata->out_busy))
363 data_len += this_urb->transfer_buffer_length;
364 }
365 dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
366 return data_len;
367 }
368 EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
369
usb_wwan_open(struct tty_struct * tty,struct usb_serial_port * port)370 int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
371 {
372 struct usb_wwan_port_private *portdata;
373 struct usb_wwan_intf_private *intfdata;
374 struct usb_serial *serial = port->serial;
375 int i, err;
376 struct urb *urb;
377
378 portdata = usb_get_serial_port_data(port);
379 intfdata = usb_get_serial_data(serial);
380
381 if (port->interrupt_in_urb) {
382 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
383 if (err) {
384 dev_err(&port->dev, "%s: submit int urb failed: %d\n",
385 __func__, err);
386 }
387 }
388
389 /* Start reading from the IN endpoint */
390 for (i = 0; i < N_IN_URB; i++) {
391 urb = portdata->in_urbs[i];
392 if (!urb)
393 continue;
394 err = usb_submit_urb(urb, GFP_KERNEL);
395 if (err) {
396 dev_err(&port->dev,
397 "%s: submit read urb %d failed: %d\n",
398 __func__, i, err);
399 }
400 }
401
402 spin_lock_irq(&intfdata->susp_lock);
403 if (++intfdata->open_ports == 1)
404 serial->interface->needs_remote_wakeup = 1;
405 spin_unlock_irq(&intfdata->susp_lock);
406 /* this balances a get in the generic USB serial code */
407 usb_autopm_put_interface(serial->interface);
408
409 return 0;
410 }
411 EXPORT_SYMBOL(usb_wwan_open);
412
unbusy_queued_urb(struct urb * urb,struct usb_wwan_port_private * portdata)413 static void unbusy_queued_urb(struct urb *urb,
414 struct usb_wwan_port_private *portdata)
415 {
416 int i;
417
418 for (i = 0; i < N_OUT_URB; i++) {
419 if (urb == portdata->out_urbs[i]) {
420 clear_bit(i, &portdata->out_busy);
421 break;
422 }
423 }
424 }
425
usb_wwan_close(struct usb_serial_port * port)426 void usb_wwan_close(struct usb_serial_port *port)
427 {
428 int i;
429 struct usb_serial *serial = port->serial;
430 struct usb_wwan_port_private *portdata;
431 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
432 struct urb *urb;
433
434 portdata = usb_get_serial_port_data(port);
435
436 /*
437 * Need to take susp_lock to make sure port is not already being
438 * resumed, but no need to hold it due to the tty-port initialized
439 * flag.
440 */
441 spin_lock_irq(&intfdata->susp_lock);
442 if (--intfdata->open_ports == 0)
443 serial->interface->needs_remote_wakeup = 0;
444 spin_unlock_irq(&intfdata->susp_lock);
445
446 for (;;) {
447 urb = usb_get_from_anchor(&portdata->delayed);
448 if (!urb)
449 break;
450 unbusy_queued_urb(urb, portdata);
451 usb_autopm_put_interface_async(serial->interface);
452 }
453
454 for (i = 0; i < N_IN_URB; i++)
455 usb_kill_urb(portdata->in_urbs[i]);
456 for (i = 0; i < N_OUT_URB; i++)
457 usb_kill_urb(portdata->out_urbs[i]);
458 usb_kill_urb(port->interrupt_in_urb);
459
460 usb_autopm_get_interface_no_resume(serial->interface);
461 }
462 EXPORT_SYMBOL(usb_wwan_close);
463
usb_wwan_setup_urb(struct usb_serial_port * port,int endpoint,int dir,void * ctx,char * buf,int len,void (* callback)(struct urb *))464 static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
465 int endpoint,
466 int dir, void *ctx, char *buf, int len,
467 void (*callback) (struct urb *))
468 {
469 struct usb_serial *serial = port->serial;
470 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
471 struct urb *urb;
472
473 urb = usb_alloc_urb(0, GFP_KERNEL); /* No ISO */
474 if (!urb)
475 return NULL;
476
477 usb_fill_bulk_urb(urb, serial->dev,
478 usb_sndbulkpipe(serial->dev, endpoint) | dir,
479 buf, len, callback, ctx);
480
481 if (intfdata->use_zlp && dir == USB_DIR_OUT)
482 urb->transfer_flags |= URB_ZERO_PACKET;
483
484 return urb;
485 }
486
usb_wwan_port_probe(struct usb_serial_port * port)487 int usb_wwan_port_probe(struct usb_serial_port *port)
488 {
489 struct usb_wwan_port_private *portdata;
490 struct urb *urb;
491 u8 *buffer;
492 int i;
493
494 if (!port->bulk_in_size || !port->bulk_out_size)
495 return -ENODEV;
496
497 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
498 if (!portdata)
499 return -ENOMEM;
500
501 init_usb_anchor(&portdata->delayed);
502
503 for (i = 0; i < N_IN_URB; i++) {
504 buffer = (u8 *)__get_free_page(GFP_KERNEL);
505 if (!buffer)
506 goto bail_out_error;
507 portdata->in_buffer[i] = buffer;
508
509 urb = usb_wwan_setup_urb(port, port->bulk_in_endpointAddress,
510 USB_DIR_IN, port,
511 buffer, IN_BUFLEN,
512 usb_wwan_indat_callback);
513 portdata->in_urbs[i] = urb;
514 }
515
516 for (i = 0; i < N_OUT_URB; i++) {
517 buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
518 if (!buffer)
519 goto bail_out_error2;
520 portdata->out_buffer[i] = buffer;
521
522 urb = usb_wwan_setup_urb(port, port->bulk_out_endpointAddress,
523 USB_DIR_OUT, port,
524 buffer, OUT_BUFLEN,
525 usb_wwan_outdat_callback);
526 portdata->out_urbs[i] = urb;
527 }
528
529 usb_set_serial_port_data(port, portdata);
530
531 return 0;
532
533 bail_out_error2:
534 for (i = 0; i < N_OUT_URB; i++) {
535 usb_free_urb(portdata->out_urbs[i]);
536 kfree(portdata->out_buffer[i]);
537 }
538 bail_out_error:
539 for (i = 0; i < N_IN_URB; i++) {
540 usb_free_urb(portdata->in_urbs[i]);
541 free_page((unsigned long)portdata->in_buffer[i]);
542 }
543 kfree(portdata);
544
545 return -ENOMEM;
546 }
547 EXPORT_SYMBOL_GPL(usb_wwan_port_probe);
548
usb_wwan_port_remove(struct usb_serial_port * port)549 int usb_wwan_port_remove(struct usb_serial_port *port)
550 {
551 int i;
552 struct usb_wwan_port_private *portdata;
553
554 portdata = usb_get_serial_port_data(port);
555 usb_set_serial_port_data(port, NULL);
556
557 for (i = 0; i < N_IN_URB; i++) {
558 usb_free_urb(portdata->in_urbs[i]);
559 free_page((unsigned long)portdata->in_buffer[i]);
560 }
561 for (i = 0; i < N_OUT_URB; i++) {
562 usb_free_urb(portdata->out_urbs[i]);
563 kfree(portdata->out_buffer[i]);
564 }
565
566 kfree(portdata);
567
568 return 0;
569 }
570 EXPORT_SYMBOL(usb_wwan_port_remove);
571
572 #ifdef CONFIG_PM
stop_urbs(struct usb_serial * serial)573 static void stop_urbs(struct usb_serial *serial)
574 {
575 int i, j;
576 struct usb_serial_port *port;
577 struct usb_wwan_port_private *portdata;
578
579 for (i = 0; i < serial->num_ports; ++i) {
580 port = serial->port[i];
581 portdata = usb_get_serial_port_data(port);
582 if (!portdata)
583 continue;
584 for (j = 0; j < N_IN_URB; j++)
585 usb_kill_urb(portdata->in_urbs[j]);
586 for (j = 0; j < N_OUT_URB; j++)
587 usb_kill_urb(portdata->out_urbs[j]);
588 usb_kill_urb(port->interrupt_in_urb);
589 }
590 }
591
usb_wwan_suspend(struct usb_serial * serial,pm_message_t message)592 int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
593 {
594 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
595
596 spin_lock_irq(&intfdata->susp_lock);
597 if (PMSG_IS_AUTO(message)) {
598 if (intfdata->in_flight) {
599 spin_unlock_irq(&intfdata->susp_lock);
600 return -EBUSY;
601 }
602 }
603 intfdata->suspended = 1;
604 spin_unlock_irq(&intfdata->susp_lock);
605
606 stop_urbs(serial);
607
608 return 0;
609 }
610 EXPORT_SYMBOL(usb_wwan_suspend);
611
612 /* Caller must hold susp_lock. */
usb_wwan_submit_delayed_urbs(struct usb_serial_port * port)613 static int usb_wwan_submit_delayed_urbs(struct usb_serial_port *port)
614 {
615 struct usb_serial *serial = port->serial;
616 struct usb_wwan_intf_private *data = usb_get_serial_data(serial);
617 struct usb_wwan_port_private *portdata;
618 struct urb *urb;
619 int err_count = 0;
620 int err;
621
622 portdata = usb_get_serial_port_data(port);
623
624 for (;;) {
625 urb = usb_get_from_anchor(&portdata->delayed);
626 if (!urb)
627 break;
628
629 err = usb_submit_urb(urb, GFP_ATOMIC);
630 if (err) {
631 dev_err(&port->dev, "%s: submit urb failed: %d\n",
632 __func__, err);
633 err_count++;
634 unbusy_queued_urb(urb, portdata);
635 usb_autopm_put_interface_async(serial->interface);
636 continue;
637 }
638 data->in_flight++;
639 }
640
641 if (err_count)
642 return -EIO;
643
644 return 0;
645 }
646
usb_wwan_resume(struct usb_serial * serial)647 int usb_wwan_resume(struct usb_serial *serial)
648 {
649 int i, j;
650 struct usb_serial_port *port;
651 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
652 struct usb_wwan_port_private *portdata;
653 struct urb *urb;
654 int err;
655 int err_count = 0;
656
657 spin_lock_irq(&intfdata->susp_lock);
658 for (i = 0; i < serial->num_ports; i++) {
659 port = serial->port[i];
660
661 if (!tty_port_initialized(&port->port))
662 continue;
663
664 portdata = usb_get_serial_port_data(port);
665
666 if (port->interrupt_in_urb) {
667 err = usb_submit_urb(port->interrupt_in_urb,
668 GFP_ATOMIC);
669 if (err) {
670 dev_err(&port->dev,
671 "%s: submit int urb failed: %d\n",
672 __func__, err);
673 err_count++;
674 }
675 }
676
677 err = usb_wwan_submit_delayed_urbs(port);
678 if (err)
679 err_count++;
680
681 for (j = 0; j < N_IN_URB; j++) {
682 urb = portdata->in_urbs[j];
683 err = usb_submit_urb(urb, GFP_ATOMIC);
684 if (err < 0) {
685 dev_err(&port->dev,
686 "%s: submit read urb %d failed: %d\n",
687 __func__, i, err);
688 err_count++;
689 }
690 }
691 }
692 intfdata->suspended = 0;
693 spin_unlock_irq(&intfdata->susp_lock);
694
695 if (err_count)
696 return -EIO;
697
698 return 0;
699 }
700 EXPORT_SYMBOL(usb_wwan_resume);
701 #endif
702
703 MODULE_AUTHOR(DRIVER_AUTHOR);
704 MODULE_DESCRIPTION(DRIVER_DESC);
705 MODULE_LICENSE("GPL v2");
706