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1/*
2 USB Driver layer for GSM modems
3
4 Copyright (C) 2005 Matthias Urlichs <smurf@smurf.noris.de>
5
6 This driver is free software; you can redistribute it and/or modify
7 it under the terms of Version 2 of the GNU General Public License as
8 published by the Free Software Foundation.
9
10 Portions copied from the Keyspan driver by Hugh Blemings <hugh@blemings.org>
11
12 History: see the git log.
13
14 Work sponsored by: Sigos GmbH, Germany <info@sigos.de>
15
16 This driver exists because the "normal" serial driver doesn't work too well
17 with GSM modems. Issues:
18 - data loss -- one single Receive URB is not nearly enough
19 - controlling the baud rate doesn't make sense
20*/
21
22#define DRIVER_VERSION "v0.7.2"
23#define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>"
24#define DRIVER_DESC "USB Driver for GSM modems"
25
26#include <linux/kernel.h>
27#include <linux/jiffies.h>
28#include <linux/errno.h>
29#include <linux/slab.h>
30#include <linux/tty.h>
31#include <linux/tty_flip.h>
32#include <linux/module.h>
33#include <linux/bitops.h>
34#include <linux/uaccess.h>
35#include <linux/usb.h>
36#include <linux/usb/serial.h>
37#include <linux/serial.h>
38#include "usb-wwan.h"
39
40static int debug;
41
42void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
43{
44 struct usb_serial *serial = port->serial;
45 struct usb_wwan_port_private *portdata;
46
47 struct usb_wwan_intf_private *intfdata;
48
49 dbg("%s", __func__);
50
51 intfdata = port->serial->private;
52
53 if (!intfdata->send_setup)
54 return;
55
56 portdata = usb_get_serial_port_data(port);
57 mutex_lock(&serial->disc_mutex);
58 portdata->rts_state = on;
59 portdata->dtr_state = on;
60 if (serial->dev)
61 intfdata->send_setup(port);
62 mutex_unlock(&serial->disc_mutex);
63}
64EXPORT_SYMBOL(usb_wwan_dtr_rts);
65
66void usb_wwan_set_termios(struct tty_struct *tty,
67 struct usb_serial_port *port,
68 struct ktermios *old_termios)
69{
70 struct usb_wwan_intf_private *intfdata = port->serial->private;
71
72 dbg("%s", __func__);
73
74 /* Doesn't support option setting */
75 tty_termios_copy_hw(tty->termios, old_termios);
76
77 if (intfdata->send_setup)
78 intfdata->send_setup(port);
79}
80EXPORT_SYMBOL(usb_wwan_set_termios);
81
82int usb_wwan_tiocmget(struct tty_struct *tty)
83{
84 struct usb_serial_port *port = tty->driver_data;
85 unsigned int value;
86 struct usb_wwan_port_private *portdata;
87
88 portdata = usb_get_serial_port_data(port);
89
90 value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
91 ((portdata->dtr_state) ? TIOCM_DTR : 0) |
92 ((portdata->cts_state) ? TIOCM_CTS : 0) |
93 ((portdata->dsr_state) ? TIOCM_DSR : 0) |
94 ((portdata->dcd_state) ? TIOCM_CAR : 0) |
95 ((portdata->ri_state) ? TIOCM_RNG : 0);
96
97 return value;
98}
99EXPORT_SYMBOL(usb_wwan_tiocmget);
100
101int usb_wwan_tiocmset(struct tty_struct *tty,
102 unsigned int set, unsigned int clear)
103{
104 struct usb_serial_port *port = tty->driver_data;
105 struct usb_wwan_port_private *portdata;
106 struct usb_wwan_intf_private *intfdata;
107
108 portdata = usb_get_serial_port_data(port);
109 intfdata = port->serial->private;
110
111 if (!intfdata->send_setup)
112 return -EINVAL;
113
114 /* FIXME: what locks portdata fields ? */
115 if (set & TIOCM_RTS)
116 portdata->rts_state = 1;
117 if (set & TIOCM_DTR)
118 portdata->dtr_state = 1;
119
120 if (clear & TIOCM_RTS)
121 portdata->rts_state = 0;
122 if (clear & TIOCM_DTR)
123 portdata->dtr_state = 0;
124 return intfdata->send_setup(port);
125}
126EXPORT_SYMBOL(usb_wwan_tiocmset);
127
128static int get_serial_info(struct usb_serial_port *port,
129 struct serial_struct __user *retinfo)
130{
131 struct serial_struct tmp;
132
133 if (!retinfo)
134 return -EFAULT;
135
136 memset(&tmp, 0, sizeof(tmp));
137 tmp.line = port->serial->minor;
138 tmp.port = port->number;
139 tmp.baud_base = tty_get_baud_rate(port->port.tty);
140 tmp.close_delay = port->port.close_delay / 10;
141 tmp.closing_wait = port->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
142 ASYNC_CLOSING_WAIT_NONE :
143 port->port.closing_wait / 10;
144
145 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
146 return -EFAULT;
147 return 0;
148}
149
150static int set_serial_info(struct usb_serial_port *port,
151 struct serial_struct __user *newinfo)
152{
153 struct serial_struct new_serial;
154 unsigned int closing_wait, close_delay;
155 int retval = 0;
156
157 if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
158 return -EFAULT;
159
160 close_delay = new_serial.close_delay * 10;
161 closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
162 ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
163
164 mutex_lock(&port->port.mutex);
165
166 if (!capable(CAP_SYS_ADMIN)) {
167 if ((close_delay != port->port.close_delay) ||
168 (closing_wait != port->port.closing_wait))
169 retval = -EPERM;
170 else
171 retval = -EOPNOTSUPP;
172 } else {
173 port->port.close_delay = close_delay;
174 port->port.closing_wait = closing_wait;
175 }
176
177 mutex_unlock(&port->port.mutex);
178 return retval;
179}
180
181int usb_wwan_ioctl(struct tty_struct *tty,
182 unsigned int cmd, unsigned long arg)
183{
184 struct usb_serial_port *port = tty->driver_data;
185
186 dbg("%s cmd 0x%04x", __func__, cmd);
187
188 switch (cmd) {
189 case TIOCGSERIAL:
190 return get_serial_info(port,
191 (struct serial_struct __user *) arg);
192 case TIOCSSERIAL:
193 return set_serial_info(port,
194 (struct serial_struct __user *) arg);
195 default:
196 break;
197 }
198
199 dbg("%s arg not supported", __func__);
200
201 return -ENOIOCTLCMD;
202}
203EXPORT_SYMBOL(usb_wwan_ioctl);
204
205/* Write */
206int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
207 const unsigned char *buf, int count)
208{
209 struct usb_wwan_port_private *portdata;
210 struct usb_wwan_intf_private *intfdata;
211 int i;
212 int left, todo;
213 struct urb *this_urb = NULL; /* spurious */
214 int err;
215 unsigned long flags;
216
217 portdata = usb_get_serial_port_data(port);
218 intfdata = port->serial->private;
219
220 dbg("%s: write (%d chars)", __func__, count);
221
222 i = 0;
223 left = count;
224 for (i = 0; left > 0 && i < N_OUT_URB; i++) {
225 todo = left;
226 if (todo > OUT_BUFLEN)
227 todo = OUT_BUFLEN;
228
229 this_urb = portdata->out_urbs[i];
230 if (test_and_set_bit(i, &portdata->out_busy)) {
231 if (time_before(jiffies,
232 portdata->tx_start_time[i] + 10 * HZ))
233 continue;
234 usb_unlink_urb(this_urb);
235 continue;
236 }
237 dbg("%s: endpoint %d buf %d", __func__,
238 usb_pipeendpoint(this_urb->pipe), i);
239
240 err = usb_autopm_get_interface_async(port->serial->interface);
241 if (err < 0)
242 break;
243
244 /* send the data */
245 memcpy(this_urb->transfer_buffer, buf, todo);
246 this_urb->transfer_buffer_length = todo;
247
248 spin_lock_irqsave(&intfdata->susp_lock, flags);
249 if (intfdata->suspended) {
250 usb_anchor_urb(this_urb, &portdata->delayed);
251 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
252 } else {
253 intfdata->in_flight++;
254 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
255 err = usb_submit_urb(this_urb, GFP_ATOMIC);
256 if (err) {
257 dbg("usb_submit_urb %p (write bulk) failed "
258 "(%d)", this_urb, err);
259 clear_bit(i, &portdata->out_busy);
260 spin_lock_irqsave(&intfdata->susp_lock, flags);
261 intfdata->in_flight--;
262 spin_unlock_irqrestore(&intfdata->susp_lock,
263 flags);
264 usb_autopm_put_interface_async(port->serial->interface);
265 break;
266 }
267 }
268
269 portdata->tx_start_time[i] = jiffies;
270 buf += todo;
271 left -= todo;
272 }
273
274 count -= left;
275 dbg("%s: wrote (did %d)", __func__, count);
276 return count;
277}
278EXPORT_SYMBOL(usb_wwan_write);
279
280static void usb_wwan_indat_callback(struct urb *urb)
281{
282 int err;
283 int endpoint;
284 struct usb_serial_port *port;
285 struct tty_struct *tty;
286 unsigned char *data = urb->transfer_buffer;
287 int status = urb->status;
288
289 dbg("%s: %p", __func__, urb);
290
291 endpoint = usb_pipeendpoint(urb->pipe);
292 port = urb->context;
293
294 if (status) {
295 dbg("%s: nonzero status: %d on endpoint %02x.",
296 __func__, status, endpoint);
297 } else {
298 tty = tty_port_tty_get(&port->port);
299 if (tty) {
300 if (urb->actual_length) {
301 tty_insert_flip_string(tty, data,
302 urb->actual_length);
303 tty_flip_buffer_push(tty);
304 } else
305 dbg("%s: empty read urb received", __func__);
306 tty_kref_put(tty);
307 }
308
309 /* Resubmit urb so we continue receiving */
310 if (status != -ESHUTDOWN) {
311 err = usb_submit_urb(urb, GFP_ATOMIC);
312 if (err) {
313 if (err != -EPERM) {
314 printk(KERN_ERR "%s: resubmit read urb failed. "
315 "(%d)", __func__, err);
316 /* busy also in error unless we are killed */
317 usb_mark_last_busy(port->serial->dev);
318 }
319 } else {
320 usb_mark_last_busy(port->serial->dev);
321 }
322 }
323
324 }
325}
326
327static void usb_wwan_outdat_callback(struct urb *urb)
328{
329 struct usb_serial_port *port;
330 struct usb_wwan_port_private *portdata;
331 struct usb_wwan_intf_private *intfdata;
332 int i;
333
334 dbg("%s", __func__);
335
336 port = urb->context;
337 intfdata = port->serial->private;
338
339 usb_serial_port_softint(port);
340 usb_autopm_put_interface_async(port->serial->interface);
341 portdata = usb_get_serial_port_data(port);
342 spin_lock(&intfdata->susp_lock);
343 intfdata->in_flight--;
344 spin_unlock(&intfdata->susp_lock);
345
346 for (i = 0; i < N_OUT_URB; ++i) {
347 if (portdata->out_urbs[i] == urb) {
348 smp_mb__before_clear_bit();
349 clear_bit(i, &portdata->out_busy);
350 break;
351 }
352 }
353}
354
355int usb_wwan_write_room(struct tty_struct *tty)
356{
357 struct usb_serial_port *port = tty->driver_data;
358 struct usb_wwan_port_private *portdata;
359 int i;
360 int data_len = 0;
361 struct urb *this_urb;
362
363 portdata = usb_get_serial_port_data(port);
364
365 for (i = 0; i < N_OUT_URB; i++) {
366 this_urb = portdata->out_urbs[i];
367 if (this_urb && !test_bit(i, &portdata->out_busy))
368 data_len += OUT_BUFLEN;
369 }
370
371 dbg("%s: %d", __func__, data_len);
372 return data_len;
373}
374EXPORT_SYMBOL(usb_wwan_write_room);
375
376int usb_wwan_chars_in_buffer(struct tty_struct *tty)
377{
378 struct usb_serial_port *port = tty->driver_data;
379 struct usb_wwan_port_private *portdata;
380 int i;
381 int data_len = 0;
382 struct urb *this_urb;
383
384 portdata = usb_get_serial_port_data(port);
385
386 for (i = 0; i < N_OUT_URB; i++) {
387 this_urb = portdata->out_urbs[i];
388 /* FIXME: This locking is insufficient as this_urb may
389 go unused during the test */
390 if (this_urb && test_bit(i, &portdata->out_busy))
391 data_len += this_urb->transfer_buffer_length;
392 }
393 dbg("%s: %d", __func__, data_len);
394 return data_len;
395}
396EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
397
398int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
399{
400 struct usb_wwan_port_private *portdata;
401 struct usb_wwan_intf_private *intfdata;
402 struct usb_serial *serial = port->serial;
403 int i, err;
404 struct urb *urb;
405
406 portdata = usb_get_serial_port_data(port);
407 intfdata = serial->private;
408
409 dbg("%s", __func__);
410
411 /* Start reading from the IN endpoint */
412 for (i = 0; i < N_IN_URB; i++) {
413 urb = portdata->in_urbs[i];
414 if (!urb)
415 continue;
416 err = usb_submit_urb(urb, GFP_KERNEL);
417 if (err) {
418 dbg("%s: submit urb %d failed (%d) %d",
419 __func__, i, err, urb->transfer_buffer_length);
420 }
421 }
422
423 if (intfdata->send_setup)
424 intfdata->send_setup(port);
425
426 serial->interface->needs_remote_wakeup = 1;
427 spin_lock_irq(&intfdata->susp_lock);
428 portdata->opened = 1;
429 spin_unlock_irq(&intfdata->susp_lock);
430 /* this balances a get in the generic USB serial code */
431 usb_autopm_put_interface(serial->interface);
432
433 return 0;
434}
435EXPORT_SYMBOL(usb_wwan_open);
436
437void usb_wwan_close(struct usb_serial_port *port)
438{
439 int i;
440 struct usb_serial *serial = port->serial;
441 struct usb_wwan_port_private *portdata;
442 struct usb_wwan_intf_private *intfdata = port->serial->private;
443
444 dbg("%s", __func__);
445 portdata = usb_get_serial_port_data(port);
446
447 if (serial->dev) {
448 /* Stop reading/writing urbs */
449 spin_lock_irq(&intfdata->susp_lock);
450 portdata->opened = 0;
451 spin_unlock_irq(&intfdata->susp_lock);
452
453 for (i = 0; i < N_IN_URB; i++)
454 usb_kill_urb(portdata->in_urbs[i]);
455 for (i = 0; i < N_OUT_URB; i++)
456 usb_kill_urb(portdata->out_urbs[i]);
457 /* balancing - important as an error cannot be handled*/
458 usb_autopm_get_interface_no_resume(serial->interface);
459 serial->interface->needs_remote_wakeup = 0;
460 }
461}
462EXPORT_SYMBOL(usb_wwan_close);
463
464/* Helper functions used by usb_wwan_setup_urbs */
465static struct urb *usb_wwan_setup_urb(struct usb_serial *serial, int endpoint,
466 int dir, void *ctx, char *buf, int len,
467 void (*callback) (struct urb *))
468{
469 struct urb *urb;
470
471 if (endpoint == -1)
472 return NULL; /* endpoint not needed */
473
474 urb = usb_alloc_urb(0, GFP_KERNEL); /* No ISO */
475 if (urb == NULL) {
476 dbg("%s: alloc for endpoint %d failed.", __func__, endpoint);
477 return NULL;
478 }
479
480 /* Fill URB using supplied data. */
481 usb_fill_bulk_urb(urb, serial->dev,
482 usb_sndbulkpipe(serial->dev, endpoint) | dir,
483 buf, len, callback, ctx);
484
485 return urb;
486}
487
488/* Setup urbs */
489static void usb_wwan_setup_urbs(struct usb_serial *serial)
490{
491 int i, j;
492 struct usb_serial_port *port;
493 struct usb_wwan_port_private *portdata;
494
495 dbg("%s", __func__);
496
497 for (i = 0; i < serial->num_ports; i++) {
498 port = serial->port[i];
499 portdata = usb_get_serial_port_data(port);
500
501 /* Do indat endpoints first */
502 for (j = 0; j < N_IN_URB; ++j) {
503 portdata->in_urbs[j] = usb_wwan_setup_urb(serial,
504 port->
505 bulk_in_endpointAddress,
506 USB_DIR_IN,
507 port,
508 portdata->
509 in_buffer[j],
510 IN_BUFLEN,
511 usb_wwan_indat_callback);
512 }
513
514 /* outdat endpoints */
515 for (j = 0; j < N_OUT_URB; ++j) {
516 portdata->out_urbs[j] = usb_wwan_setup_urb(serial,
517 port->
518 bulk_out_endpointAddress,
519 USB_DIR_OUT,
520 port,
521 portdata->
522 out_buffer
523 [j],
524 OUT_BUFLEN,
525 usb_wwan_outdat_callback);
526 }
527 }
528}
529
530int usb_wwan_startup(struct usb_serial *serial)
531{
532 int i, j, err;
533 struct usb_serial_port *port;
534 struct usb_wwan_port_private *portdata;
535 u8 *buffer;
536
537 dbg("%s", __func__);
538
539 /* Now setup per port private data */
540 for (i = 0; i < serial->num_ports; i++) {
541 port = serial->port[i];
542 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
543 if (!portdata) {
544 dbg("%s: kmalloc for usb_wwan_port_private (%d) failed!.",
545 __func__, i);
546 return 1;
547 }
548 init_usb_anchor(&portdata->delayed);
549
550 for (j = 0; j < N_IN_URB; j++) {
551 buffer = (u8 *) __get_free_page(GFP_KERNEL);
552 if (!buffer)
553 goto bail_out_error;
554 portdata->in_buffer[j] = buffer;
555 }
556
557 for (j = 0; j < N_OUT_URB; j++) {
558 buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
559 if (!buffer)
560 goto bail_out_error2;
561 portdata->out_buffer[j] = buffer;
562 }
563
564 usb_set_serial_port_data(port, portdata);
565
566 if (!port->interrupt_in_urb)
567 continue;
568 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
569 if (err)
570 dbg("%s: submit irq_in urb failed %d", __func__, err);
571 }
572 usb_wwan_setup_urbs(serial);
573 return 0;
574
575bail_out_error2:
576 for (j = 0; j < N_OUT_URB; j++)
577 kfree(portdata->out_buffer[j]);
578bail_out_error:
579 for (j = 0; j < N_IN_URB; j++)
580 if (portdata->in_buffer[j])
581 free_page((unsigned long)portdata->in_buffer[j]);
582 kfree(portdata);
583 return 1;
584}
585EXPORT_SYMBOL(usb_wwan_startup);
586
587static void stop_read_write_urbs(struct usb_serial *serial)
588{
589 int i, j;
590 struct usb_serial_port *port;
591 struct usb_wwan_port_private *portdata;
592
593 /* Stop reading/writing urbs */
594 for (i = 0; i < serial->num_ports; ++i) {
595 port = serial->port[i];
596 portdata = usb_get_serial_port_data(port);
597 for (j = 0; j < N_IN_URB; j++)
598 usb_kill_urb(portdata->in_urbs[j]);
599 for (j = 0; j < N_OUT_URB; j++)
600 usb_kill_urb(portdata->out_urbs[j]);
601 }
602}
603
604void usb_wwan_disconnect(struct usb_serial *serial)
605{
606 dbg("%s", __func__);
607
608 stop_read_write_urbs(serial);
609}
610EXPORT_SYMBOL(usb_wwan_disconnect);
611
612void usb_wwan_release(struct usb_serial *serial)
613{
614 int i, j;
615 struct usb_serial_port *port;
616 struct usb_wwan_port_private *portdata;
617
618 dbg("%s", __func__);
619
620 /* Now free them */
621 for (i = 0; i < serial->num_ports; ++i) {
622 port = serial->port[i];
623 portdata = usb_get_serial_port_data(port);
624
625 for (j = 0; j < N_IN_URB; j++) {
626 usb_free_urb(portdata->in_urbs[j]);
627 free_page((unsigned long)
628 portdata->in_buffer[j]);
629 portdata->in_urbs[j] = NULL;
630 }
631 for (j = 0; j < N_OUT_URB; j++) {
632 usb_free_urb(portdata->out_urbs[j]);
633 kfree(portdata->out_buffer[j]);
634 portdata->out_urbs[j] = NULL;
635 }
636 }
637
638 /* Now free per port private data */
639 for (i = 0; i < serial->num_ports; i++) {
640 port = serial->port[i];
641 kfree(usb_get_serial_port_data(port));
642 }
643}
644EXPORT_SYMBOL(usb_wwan_release);
645
646#ifdef CONFIG_PM
647int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
648{
649 struct usb_wwan_intf_private *intfdata = serial->private;
650 int b;
651
652 dbg("%s entered", __func__);
653
654 if (message.event & PM_EVENT_AUTO) {
655 spin_lock_irq(&intfdata->susp_lock);
656 b = intfdata->in_flight;
657 spin_unlock_irq(&intfdata->susp_lock);
658
659 if (b)
660 return -EBUSY;
661 }
662
663 spin_lock_irq(&intfdata->susp_lock);
664 intfdata->suspended = 1;
665 spin_unlock_irq(&intfdata->susp_lock);
666 stop_read_write_urbs(serial);
667
668 return 0;
669}
670EXPORT_SYMBOL(usb_wwan_suspend);
671
672static void unbusy_queued_urb(struct urb *urb, struct usb_wwan_port_private *portdata)
673{
674 int i;
675
676 for (i = 0; i < N_OUT_URB; i++) {
677 if (urb == portdata->out_urbs[i]) {
678 clear_bit(i, &portdata->out_busy);
679 break;
680 }
681 }
682}
683
684static void play_delayed(struct usb_serial_port *port)
685{
686 struct usb_wwan_intf_private *data;
687 struct usb_wwan_port_private *portdata;
688 struct urb *urb;
689 int err;
690
691 portdata = usb_get_serial_port_data(port);
692 data = port->serial->private;
693 while ((urb = usb_get_from_anchor(&portdata->delayed))) {
694 err = usb_submit_urb(urb, GFP_ATOMIC);
695 if (!err) {
696 data->in_flight++;
697 } else {
698 /* we have to throw away the rest */
699 do {
700 unbusy_queued_urb(urb, portdata);
701 usb_autopm_put_interface_no_suspend(port->serial->interface);
702 } while ((urb = usb_get_from_anchor(&portdata->delayed)));
703 break;
704 }
705 }
706}
707
708int usb_wwan_resume(struct usb_serial *serial)
709{
710 int i, j;
711 struct usb_serial_port *port;
712 struct usb_wwan_intf_private *intfdata = serial->private;
713 struct usb_wwan_port_private *portdata;
714 struct urb *urb;
715 int err = 0;
716
717 dbg("%s entered", __func__);
718 /* get the interrupt URBs resubmitted unconditionally */
719 for (i = 0; i < serial->num_ports; i++) {
720 port = serial->port[i];
721 if (!port->interrupt_in_urb) {
722 dbg("%s: No interrupt URB for port %d", __func__, i);
723 continue;
724 }
725 err = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
726 dbg("Submitted interrupt URB for port %d (result %d)", i, err);
727 if (err < 0) {
728 err("%s: Error %d for interrupt URB of port%d",
729 __func__, err, i);
730 goto err_out;
731 }
732 }
733
734 for (i = 0; i < serial->num_ports; i++) {
735 /* walk all ports */
736 port = serial->port[i];
737 portdata = usb_get_serial_port_data(port);
738
739 /* skip closed ports */
740 spin_lock_irq(&intfdata->susp_lock);
741 if (!portdata->opened) {
742 spin_unlock_irq(&intfdata->susp_lock);
743 continue;
744 }
745
746 for (j = 0; j < N_IN_URB; j++) {
747 urb = portdata->in_urbs[j];
748 err = usb_submit_urb(urb, GFP_ATOMIC);
749 if (err < 0) {
750 err("%s: Error %d for bulk URB %d",
751 __func__, err, i);
752 spin_unlock_irq(&intfdata->susp_lock);
753 goto err_out;
754 }
755 }
756 play_delayed(port);
757 spin_unlock_irq(&intfdata->susp_lock);
758 }
759 spin_lock_irq(&intfdata->susp_lock);
760 intfdata->suspended = 0;
761 spin_unlock_irq(&intfdata->susp_lock);
762err_out:
763 return err;
764}
765EXPORT_SYMBOL(usb_wwan_resume);
766#endif
767
768MODULE_AUTHOR(DRIVER_AUTHOR);
769MODULE_DESCRIPTION(DRIVER_DESC);
770MODULE_VERSION(DRIVER_VERSION);
771MODULE_LICENSE("GPL");
772
773module_param(debug, bool, S_IRUGO | S_IWUSR);
774MODULE_PARM_DESC(debug, "Debug messages");
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 */
40static 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
70void 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}
87EXPORT_SYMBOL(usb_wwan_dtr_rts);
88
89int 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}
106EXPORT_SYMBOL(usb_wwan_tiocmget);
107
108int 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}
133EXPORT_SYMBOL(usb_wwan_tiocmset);
134
135static int get_serial_info(struct usb_serial_port *port,
136 struct serial_struct __user *retinfo)
137{
138 struct serial_struct tmp;
139
140 memset(&tmp, 0, sizeof(tmp));
141 tmp.line = port->minor;
142 tmp.port = port->port_number;
143 tmp.baud_base = tty_get_baud_rate(port->port.tty);
144 tmp.close_delay = port->port.close_delay / 10;
145 tmp.closing_wait = port->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
146 ASYNC_CLOSING_WAIT_NONE :
147 port->port.closing_wait / 10;
148
149 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
150 return -EFAULT;
151 return 0;
152}
153
154static int set_serial_info(struct usb_serial_port *port,
155 struct serial_struct __user *newinfo)
156{
157 struct serial_struct new_serial;
158 unsigned int closing_wait, close_delay;
159 int retval = 0;
160
161 if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
162 return -EFAULT;
163
164 close_delay = new_serial.close_delay * 10;
165 closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
166 ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
167
168 mutex_lock(&port->port.mutex);
169
170 if (!capable(CAP_SYS_ADMIN)) {
171 if ((close_delay != port->port.close_delay) ||
172 (closing_wait != port->port.closing_wait))
173 retval = -EPERM;
174 else
175 retval = -EOPNOTSUPP;
176 } else {
177 port->port.close_delay = close_delay;
178 port->port.closing_wait = closing_wait;
179 }
180
181 mutex_unlock(&port->port.mutex);
182 return retval;
183}
184
185int usb_wwan_ioctl(struct tty_struct *tty,
186 unsigned int cmd, unsigned long arg)
187{
188 struct usb_serial_port *port = tty->driver_data;
189
190 dev_dbg(&port->dev, "%s cmd 0x%04x\n", __func__, cmd);
191
192 switch (cmd) {
193 case TIOCGSERIAL:
194 return get_serial_info(port,
195 (struct serial_struct __user *) arg);
196 case TIOCSSERIAL:
197 return set_serial_info(port,
198 (struct serial_struct __user *) arg);
199 default:
200 break;
201 }
202
203 dev_dbg(&port->dev, "%s arg not supported\n", __func__);
204
205 return -ENOIOCTLCMD;
206}
207EXPORT_SYMBOL(usb_wwan_ioctl);
208
209int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
210 const unsigned char *buf, int count)
211{
212 struct usb_wwan_port_private *portdata;
213 struct usb_wwan_intf_private *intfdata;
214 int i;
215 int left, todo;
216 struct urb *this_urb = NULL; /* spurious */
217 int err;
218 unsigned long flags;
219
220 portdata = usb_get_serial_port_data(port);
221 intfdata = usb_get_serial_data(port->serial);
222
223 dev_dbg(&port->dev, "%s: write (%d chars)\n", __func__, count);
224
225 i = 0;
226 left = count;
227 for (i = 0; left > 0 && i < N_OUT_URB; i++) {
228 todo = left;
229 if (todo > OUT_BUFLEN)
230 todo = OUT_BUFLEN;
231
232 this_urb = portdata->out_urbs[i];
233 if (test_and_set_bit(i, &portdata->out_busy)) {
234 if (time_before(jiffies,
235 portdata->tx_start_time[i] + 10 * HZ))
236 continue;
237 usb_unlink_urb(this_urb);
238 continue;
239 }
240 dev_dbg(&port->dev, "%s: endpoint %d buf %d\n", __func__,
241 usb_pipeendpoint(this_urb->pipe), i);
242
243 err = usb_autopm_get_interface_async(port->serial->interface);
244 if (err < 0) {
245 clear_bit(i, &portdata->out_busy);
246 break;
247 }
248
249 /* send the data */
250 memcpy(this_urb->transfer_buffer, buf, todo);
251 this_urb->transfer_buffer_length = todo;
252
253 spin_lock_irqsave(&intfdata->susp_lock, flags);
254 if (intfdata->suspended) {
255 usb_anchor_urb(this_urb, &portdata->delayed);
256 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
257 } else {
258 intfdata->in_flight++;
259 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
260 err = usb_submit_urb(this_urb, GFP_ATOMIC);
261 if (err) {
262 dev_err(&port->dev,
263 "%s: submit urb %d failed: %d\n",
264 __func__, i, err);
265 clear_bit(i, &portdata->out_busy);
266 spin_lock_irqsave(&intfdata->susp_lock, flags);
267 intfdata->in_flight--;
268 spin_unlock_irqrestore(&intfdata->susp_lock,
269 flags);
270 usb_autopm_put_interface_async(port->serial->interface);
271 break;
272 }
273 }
274
275 portdata->tx_start_time[i] = jiffies;
276 buf += todo;
277 left -= todo;
278 }
279
280 count -= left;
281 dev_dbg(&port->dev, "%s: wrote (did %d)\n", __func__, count);
282 return count;
283}
284EXPORT_SYMBOL(usb_wwan_write);
285
286static void usb_wwan_indat_callback(struct urb *urb)
287{
288 int err;
289 int endpoint;
290 struct usb_serial_port *port;
291 struct device *dev;
292 unsigned char *data = urb->transfer_buffer;
293 int status = urb->status;
294
295 endpoint = usb_pipeendpoint(urb->pipe);
296 port = urb->context;
297 dev = &port->dev;
298
299 if (status) {
300 dev_dbg(dev, "%s: nonzero status: %d on endpoint %02x.\n",
301 __func__, status, endpoint);
302 } else {
303 if (urb->actual_length) {
304 tty_insert_flip_string(&port->port, data,
305 urb->actual_length);
306 tty_flip_buffer_push(&port->port);
307 } else
308 dev_dbg(dev, "%s: empty read urb received\n", __func__);
309 }
310 /* Resubmit urb so we continue receiving */
311 err = usb_submit_urb(urb, GFP_ATOMIC);
312 if (err) {
313 if (err != -EPERM && err != -ENODEV) {
314 dev_err(dev, "%s: resubmit read urb failed. (%d)\n",
315 __func__, err);
316 /* busy also in error unless we are killed */
317 usb_mark_last_busy(port->serial->dev);
318 }
319 } else {
320 usb_mark_last_busy(port->serial->dev);
321 }
322}
323
324static void usb_wwan_outdat_callback(struct urb *urb)
325{
326 struct usb_serial_port *port;
327 struct usb_wwan_port_private *portdata;
328 struct usb_wwan_intf_private *intfdata;
329 int i;
330
331 port = urb->context;
332 intfdata = usb_get_serial_data(port->serial);
333
334 usb_serial_port_softint(port);
335 usb_autopm_put_interface_async(port->serial->interface);
336 portdata = usb_get_serial_port_data(port);
337 spin_lock(&intfdata->susp_lock);
338 intfdata->in_flight--;
339 spin_unlock(&intfdata->susp_lock);
340
341 for (i = 0; i < N_OUT_URB; ++i) {
342 if (portdata->out_urbs[i] == urb) {
343 smp_mb__before_atomic();
344 clear_bit(i, &portdata->out_busy);
345 break;
346 }
347 }
348}
349
350int usb_wwan_write_room(struct tty_struct *tty)
351{
352 struct usb_serial_port *port = tty->driver_data;
353 struct usb_wwan_port_private *portdata;
354 int i;
355 int data_len = 0;
356 struct urb *this_urb;
357
358 portdata = usb_get_serial_port_data(port);
359
360 for (i = 0; i < N_OUT_URB; i++) {
361 this_urb = portdata->out_urbs[i];
362 if (this_urb && !test_bit(i, &portdata->out_busy))
363 data_len += OUT_BUFLEN;
364 }
365
366 dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
367 return data_len;
368}
369EXPORT_SYMBOL(usb_wwan_write_room);
370
371int usb_wwan_chars_in_buffer(struct tty_struct *tty)
372{
373 struct usb_serial_port *port = tty->driver_data;
374 struct usb_wwan_port_private *portdata;
375 int i;
376 int data_len = 0;
377 struct urb *this_urb;
378
379 portdata = usb_get_serial_port_data(port);
380
381 for (i = 0; i < N_OUT_URB; i++) {
382 this_urb = portdata->out_urbs[i];
383 /* FIXME: This locking is insufficient as this_urb may
384 go unused during the test */
385 if (this_urb && test_bit(i, &portdata->out_busy))
386 data_len += this_urb->transfer_buffer_length;
387 }
388 dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
389 return data_len;
390}
391EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
392
393int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
394{
395 struct usb_wwan_port_private *portdata;
396 struct usb_wwan_intf_private *intfdata;
397 struct usb_serial *serial = port->serial;
398 int i, err;
399 struct urb *urb;
400
401 portdata = usb_get_serial_port_data(port);
402 intfdata = usb_get_serial_data(serial);
403
404 if (port->interrupt_in_urb) {
405 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
406 if (err) {
407 dev_err(&port->dev, "%s: submit int urb failed: %d\n",
408 __func__, err);
409 }
410 }
411
412 /* Start reading from the IN endpoint */
413 for (i = 0; i < N_IN_URB; i++) {
414 urb = portdata->in_urbs[i];
415 if (!urb)
416 continue;
417 err = usb_submit_urb(urb, GFP_KERNEL);
418 if (err) {
419 dev_err(&port->dev,
420 "%s: submit read urb %d failed: %d\n",
421 __func__, i, err);
422 }
423 }
424
425 spin_lock_irq(&intfdata->susp_lock);
426 if (++intfdata->open_ports == 1)
427 serial->interface->needs_remote_wakeup = 1;
428 spin_unlock_irq(&intfdata->susp_lock);
429 /* this balances a get in the generic USB serial code */
430 usb_autopm_put_interface(serial->interface);
431
432 return 0;
433}
434EXPORT_SYMBOL(usb_wwan_open);
435
436static void unbusy_queued_urb(struct urb *urb,
437 struct usb_wwan_port_private *portdata)
438{
439 int i;
440
441 for (i = 0; i < N_OUT_URB; i++) {
442 if (urb == portdata->out_urbs[i]) {
443 clear_bit(i, &portdata->out_busy);
444 break;
445 }
446 }
447}
448
449void usb_wwan_close(struct usb_serial_port *port)
450{
451 int i;
452 struct usb_serial *serial = port->serial;
453 struct usb_wwan_port_private *portdata;
454 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
455 struct urb *urb;
456
457 portdata = usb_get_serial_port_data(port);
458
459 /*
460 * Need to take susp_lock to make sure port is not already being
461 * resumed, but no need to hold it due to initialized
462 */
463 spin_lock_irq(&intfdata->susp_lock);
464 if (--intfdata->open_ports == 0)
465 serial->interface->needs_remote_wakeup = 0;
466 spin_unlock_irq(&intfdata->susp_lock);
467
468 for (;;) {
469 urb = usb_get_from_anchor(&portdata->delayed);
470 if (!urb)
471 break;
472 unbusy_queued_urb(urb, portdata);
473 usb_autopm_put_interface_async(serial->interface);
474 }
475
476 for (i = 0; i < N_IN_URB; i++)
477 usb_kill_urb(portdata->in_urbs[i]);
478 for (i = 0; i < N_OUT_URB; i++)
479 usb_kill_urb(portdata->out_urbs[i]);
480 usb_kill_urb(port->interrupt_in_urb);
481
482 usb_autopm_get_interface_no_resume(serial->interface);
483}
484EXPORT_SYMBOL(usb_wwan_close);
485
486static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
487 int endpoint,
488 int dir, void *ctx, char *buf, int len,
489 void (*callback) (struct urb *))
490{
491 struct usb_serial *serial = port->serial;
492 struct urb *urb;
493
494 urb = usb_alloc_urb(0, GFP_KERNEL); /* No ISO */
495 if (!urb)
496 return NULL;
497
498 usb_fill_bulk_urb(urb, serial->dev,
499 usb_sndbulkpipe(serial->dev, endpoint) | dir,
500 buf, len, callback, ctx);
501
502 return urb;
503}
504
505int usb_wwan_port_probe(struct usb_serial_port *port)
506{
507 struct usb_wwan_port_private *portdata;
508 struct urb *urb;
509 u8 *buffer;
510 int i;
511
512 if (!port->bulk_in_size || !port->bulk_out_size)
513 return -ENODEV;
514
515 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
516 if (!portdata)
517 return -ENOMEM;
518
519 init_usb_anchor(&portdata->delayed);
520
521 for (i = 0; i < N_IN_URB; i++) {
522 buffer = (u8 *)__get_free_page(GFP_KERNEL);
523 if (!buffer)
524 goto bail_out_error;
525 portdata->in_buffer[i] = buffer;
526
527 urb = usb_wwan_setup_urb(port, port->bulk_in_endpointAddress,
528 USB_DIR_IN, port,
529 buffer, IN_BUFLEN,
530 usb_wwan_indat_callback);
531 portdata->in_urbs[i] = urb;
532 }
533
534 for (i = 0; i < N_OUT_URB; i++) {
535 buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
536 if (!buffer)
537 goto bail_out_error2;
538 portdata->out_buffer[i] = buffer;
539
540 urb = usb_wwan_setup_urb(port, port->bulk_out_endpointAddress,
541 USB_DIR_OUT, port,
542 buffer, OUT_BUFLEN,
543 usb_wwan_outdat_callback);
544 portdata->out_urbs[i] = urb;
545 }
546
547 usb_set_serial_port_data(port, portdata);
548
549 return 0;
550
551bail_out_error2:
552 for (i = 0; i < N_OUT_URB; i++) {
553 usb_free_urb(portdata->out_urbs[i]);
554 kfree(portdata->out_buffer[i]);
555 }
556bail_out_error:
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 kfree(portdata);
562
563 return -ENOMEM;
564}
565EXPORT_SYMBOL_GPL(usb_wwan_port_probe);
566
567int usb_wwan_port_remove(struct usb_serial_port *port)
568{
569 int i;
570 struct usb_wwan_port_private *portdata;
571
572 portdata = usb_get_serial_port_data(port);
573 usb_set_serial_port_data(port, NULL);
574
575 for (i = 0; i < N_IN_URB; i++) {
576 usb_free_urb(portdata->in_urbs[i]);
577 free_page((unsigned long)portdata->in_buffer[i]);
578 }
579 for (i = 0; i < N_OUT_URB; i++) {
580 usb_free_urb(portdata->out_urbs[i]);
581 kfree(portdata->out_buffer[i]);
582 }
583
584 kfree(portdata);
585
586 return 0;
587}
588EXPORT_SYMBOL(usb_wwan_port_remove);
589
590#ifdef CONFIG_PM
591static void stop_urbs(struct usb_serial *serial)
592{
593 int i, j;
594 struct usb_serial_port *port;
595 struct usb_wwan_port_private *portdata;
596
597 for (i = 0; i < serial->num_ports; ++i) {
598 port = serial->port[i];
599 portdata = usb_get_serial_port_data(port);
600 if (!portdata)
601 continue;
602 for (j = 0; j < N_IN_URB; j++)
603 usb_kill_urb(portdata->in_urbs[j]);
604 for (j = 0; j < N_OUT_URB; j++)
605 usb_kill_urb(portdata->out_urbs[j]);
606 usb_kill_urb(port->interrupt_in_urb);
607 }
608}
609
610int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
611{
612 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
613
614 spin_lock_irq(&intfdata->susp_lock);
615 if (PMSG_IS_AUTO(message)) {
616 if (intfdata->in_flight) {
617 spin_unlock_irq(&intfdata->susp_lock);
618 return -EBUSY;
619 }
620 }
621 intfdata->suspended = 1;
622 spin_unlock_irq(&intfdata->susp_lock);
623
624 stop_urbs(serial);
625
626 return 0;
627}
628EXPORT_SYMBOL(usb_wwan_suspend);
629
630/* Caller must hold susp_lock. */
631static int usb_wwan_submit_delayed_urbs(struct usb_serial_port *port)
632{
633 struct usb_serial *serial = port->serial;
634 struct usb_wwan_intf_private *data = usb_get_serial_data(serial);
635 struct usb_wwan_port_private *portdata;
636 struct urb *urb;
637 int err_count = 0;
638 int err;
639
640 portdata = usb_get_serial_port_data(port);
641
642 for (;;) {
643 urb = usb_get_from_anchor(&portdata->delayed);
644 if (!urb)
645 break;
646
647 err = usb_submit_urb(urb, GFP_ATOMIC);
648 if (err) {
649 dev_err(&port->dev, "%s: submit urb failed: %d\n",
650 __func__, err);
651 err_count++;
652 unbusy_queued_urb(urb, portdata);
653 usb_autopm_put_interface_async(serial->interface);
654 continue;
655 }
656 data->in_flight++;
657 }
658
659 if (err_count)
660 return -EIO;
661
662 return 0;
663}
664
665int usb_wwan_resume(struct usb_serial *serial)
666{
667 int i, j;
668 struct usb_serial_port *port;
669 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
670 struct usb_wwan_port_private *portdata;
671 struct urb *urb;
672 int err;
673 int err_count = 0;
674
675 spin_lock_irq(&intfdata->susp_lock);
676 for (i = 0; i < serial->num_ports; i++) {
677 port = serial->port[i];
678
679 if (!tty_port_initialized(&port->port))
680 continue;
681
682 portdata = usb_get_serial_port_data(port);
683
684 if (port->interrupt_in_urb) {
685 err = usb_submit_urb(port->interrupt_in_urb,
686 GFP_ATOMIC);
687 if (err) {
688 dev_err(&port->dev,
689 "%s: submit int urb failed: %d\n",
690 __func__, err);
691 err_count++;
692 }
693 }
694
695 err = usb_wwan_submit_delayed_urbs(port);
696 if (err)
697 err_count++;
698
699 for (j = 0; j < N_IN_URB; j++) {
700 urb = portdata->in_urbs[j];
701 err = usb_submit_urb(urb, GFP_ATOMIC);
702 if (err < 0) {
703 dev_err(&port->dev,
704 "%s: submit read urb %d failed: %d\n",
705 __func__, i, err);
706 err_count++;
707 }
708 }
709 }
710 intfdata->suspended = 0;
711 spin_unlock_irq(&intfdata->susp_lock);
712
713 if (err_count)
714 return -EIO;
715
716 return 0;
717}
718EXPORT_SYMBOL(usb_wwan_resume);
719#endif
720
721MODULE_AUTHOR(DRIVER_AUTHOR);
722MODULE_DESCRIPTION(DRIVER_DESC);
723MODULE_LICENSE("GPL v2");